Ejector rod demolding mechanism and mold

Abstract

The ejector rod demolding mechanism comprises a first forming assembly, a second forming assembly, a driving device and an ejector rod, the first forming assembly is used for forming an upper inverted buckle of a plastic part product, the second forming assembly is used for forming a buckle turned edge and a hole inverted buckle of the plastic part product, and the second forming assembly is installed on a lower mold in a sliding mode; the first forming assembly is slidably mounted at the top end of the second forming assembly, the driving device is mounted on the lower die, the output end of the driving device is connected with the ejector rod, and the ejector rod is matched with the first forming assembly and the second forming assembly through a guide structure. The utility model further discloses a mold which comprises the ejector rod demolding mechanism. The mold has the beneficial effects that the ejector rod can enable the two forming assemblies to be subjected to step-by-step demolding through the guide structure, and the problem of deformation easily occurring during demolding is solved; and during mold closing, the ejector rod can enable the two forming assemblies to be reset and locked through the guide structure, so that the production efficiency and the product quality are improved.

Description

Technical Field

[0001] The present application relates to the field of mold technology, and in particular to a push rod demoulding mechanism and a mold. Background Art

[0002] Injection molds are tools for producing plastic products; they are also tools that give plastic products a complete structure and precise dimensions. Injection molding is a processing method used in mass production of certain parts with complex shapes. Specifically, it refers to the process of injecting heated and melted plastic into the mold cavity under high pressure by an injection molding machine, and then cooling and solidifying to obtain a molded product.

[0003] An existing injection molding product such as Figure 1 As shown, the top of the product has an upper undercut A, and the product side has a buckle flange B and a hole undercut C. Therefore, when demolding, if the product is directly pushed up by the ejector pin for demolding, the hole undercut C and the buckle flange B will interfere with it; if the core block is separated from the product by horizontal movement, the large contact area between the core block and the product and the upper undercut A will make demolding difficult. Therefore, a ejector demolding mechanism and a mold are proposed to solve the above technical problems. Utility Model Content

[0004] One of the purposes of the present application is to provide a push rod demoulding mechanism.

[0005] Another object of the present application is to provide a mold with a ejector demoulding mechanism.

[0006] To achieve the above purpose, the technical solution adopted in the present application is: a push rod demoulding mechanism, including a first molding component, a second molding component, a driving device and a push rod, the first molding component is used for molding the upper undercut of a plastic product, the second molding component is used for molding the buckle flange and the hole undercut of a plastic product, the second molding component is slidably installed on the lower mold, the first molding component is slidably installed on the top of the second molding component, the driving device is installed on the lower mold and the output end is connected with the push rod, the push rod cooperates with the first molding component and the second molding component through a guide structure; when demoulding, the driving device is suitable for driving the push rod to move up and perform a first process and a second process, wherein in the first process: the push rod is suitable for driving the second molding component to move in a first direction through the guide structure, at which time the guide structure is disengaged from the first molding component; in the second process: the push rod is suitable for driving the first molding component to move in the first direction through the guide structure; when closing the mold, the push rod is suitable for driving the first molding component and the second molding component to move and reset through the guide structure and lock the reset first molding component and the second molding component.

[0007] Preferably, the first molding component includes a first core block, which is sleeved on the outside of the push rod, and the guide structure includes an inclined section arranged at the upper end of the push rod and a vertical section 1 arranged at the top of the inclined section, and the inner walls on both sides of the first core block are respectively provided with an inclined surface 1 and a straight surface 1; when performing the first process, the straight surface 1 cooperates with the vertical section 1, at which time the inclined section disengages from the inclined surface 1, and the first core block remains stationary; when performing the second process, the inclined section cooperates with the wedge-shaped extrusion of the inclined surface 1 to drive the first core block to move in the first direction; when closing the mold, the inclined section cooperates with the wedge-shaped extrusion of the straight surface 1 to drive the first core block to move and reset, and the inclined section and the straight surface 1 are in a state of abutment.

[0008] Preferably, the second molding assembly includes a second core block, which is sleeved on the outside of the push rod, and the guide structure also includes a vertical section 2 arranged at the bottom end of the inclined section, and an inner wall of one side of the second core block is provided with a left straight surface 2 and a left inclined surface 2 distributed up and down; when performing the first process, the inclined section and the wedge-shaped extrusion of the left inclined surface 2 are matched to drive the second core block to move in the first direction; when performing the second process, the vertical section 2 and the left straight surface 2 are matched so that the inclined section and the left inclined surface 2 are disengaged.

[0009] Preferably, the inner wall on the other side of the second core block is provided with a right inclined surface 2 and a right straight surface 2 distributed up and down, and the spacing between the left straight surface 2 and the right straight surface 2 is the same as the width of the vertical section 2; when performing the first process, the inclined section and the right inclined surface 2 are abutted against each other; when performing the second process, the vertical section 2 and the right straight surface 2 and the left straight surface 2 are all in abutment against each other, so that the second core block remains stationary; when closing the mold, the inclined section and the wedge-shaped extrusion of the right straight surface 2 are matched to drive the second core block to move and reset, and the inclined section and the right inclined surface 2 are in abutment against each other.

[0010] Preferably, the top end of the ejector rod has a locking portion; when the mold is closed, the locking portion is suitable for re-locking the reset first molding component and the second molding component.

[0011] Preferably, the locking portion comprises a barb arranged at the top end of the ejector rod; when the mold is closed, the barb is suitable for clamping and abutting against the reset first molding component and the second molding component.

[0012] Preferably, an inclined portion is provided on the inner side of the barb, and the sides of the first molding component and the second molding component are both provided with inclined surfaces matching the inclined portion; when the first molding component and the second molding component are locked, the inclined surface and the inclined portion are in an abutting matching state.

[0013] Preferably, the barb, the vertical section 1, the inclined section and the vertical section 2 which are arranged in sequence from top to bottom on the upper end of the push rod are all integrally formed with the push rod.

[0014] Preferably, the first core block and the second core block are slidably matched via a dovetail groove structure.

[0015] A mould comprises the ejector demoulding mechanism mentioned above.

[0016] Compared with the prior art, the beneficial effects of this application are:

[0017] The utility model is provided with a push rod, which cooperates with the two molding components through a guide structure, so that the first molding component and the second molding component can be demolded in steps, thereby greatly reducing the deformation problem that is easy to occur in traditional one-time demolding and improving the molding quality of plastic products; when the mold is closed, the push rod can reset and lock the two molding components through the guide structure to ensure that they can maintain the correct position and posture when the mold is closed next time, thereby improving production efficiency and product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of an existing plastic product of the utility model.

[0019] Figure 2 It is a schematic diagram of the overall structure of the utility model.

[0020] Figure 3 It is a schematic diagram of the structure of the upper mold after mold opening of the utility model.

[0021] Figure 4 It is a schematic diagram of the enlarged structure of point E of the utility model.

[0022] Figure 5 It is a cross-sectional structural schematic diagram of the utility model.

[0023] Figure 6 This is a schematic structural diagram of the utility model when the first core block and the second core block are locked.

[0024] Figure 7 It is a schematic diagram of the structure when the second core block of the utility model is detached.

[0025] Figure 8It is a schematic diagram of the structure of the first core block of the utility model when it is detached.

[0026] Fig. 9 It is a schematic diagram of the locking part structure of the utility model.

[0027] Fig.10 It is a schematic diagram of the guiding structure of the utility model.

[0028] Fig.11 It is a schematic diagram of the internal structure of the first core block and the second core block of the utility model.

[0029] In the figure: 1. upper mold; 2. lower mold; 3. demoulding mechanism; 301. ejector pin; 302. driving device; 4. first molding assembly; 401. first core block; 5. second molding assembly; 501. second core block; 6. guiding structure; 601. vertical section one; 602. inclined section; 603. vertical section two; 7. locking portion; 701. barb; 8. dovetail groove structure; 9. inclined portion; 10. inclined surface; 11. inclined surface one; 12. straight surface one; 13. left straight surface two; 14. left inclined surface two; 15. right inclined surface two; 16. right straight surface two. DETAILED DESCRIPTION

[0030] Below, the present application is further described in conjunction with specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0031] In the description of the present application, it should be noted that directional words, such as the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of narrating the present application 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 cannot be understood as limiting the specific scope of protection of the present application.

[0032] It should be noted that the terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0033] In the prior art, such as Figure 1 As shown in (a) in FIG. 1 , it is a schematic diagram of the structure of the plastic product D. Figure 1 As shown in (b) in FIG. 1 , there is an upper undercut A at the inner top of the plastic product D, and a buckle flange B and a hole undercut C are provided at the inner side of the plastic product D. Figure 1As shown in (c), it is the core block corresponding to the upper undercut A, the buckle flange B and the hole undercut C. The demoulding of the plastic product D is generally carried out by lifting it upward (in the y direction) through the ejector structure. However, due to the existence of the buckle flange B and the hole undercut C, it will interfere with the ejection of the product in the y direction. Therefore, the core block must be moved to the left translation direction (x direction) first, so that the core block is separated from the upper undercut A, the buckle flange B and the hole undercut C, and then it can be prepared for the subsequent further demoulding.

[0034] The existing solution is generally to install a driving source that cooperates with the core block in the mold, and to translate the core block for demolding under the action of the driving source. However, since the core block is an integral structure, the contact area between the core block and the plastic product D is large. Although the core block can be easily separated from the buckle flange B and the hole undercut C by translation, the demolding direction of the upper undercut A is inconsistent with the x direction. Although the upper undercut A can be forced to be demolded through the deformation of the plastic product D, this demolding method will also make demolding more difficult, and may even cause the plastic product D to be deformed and damaged, thereby affecting the quality of the plastic product D.

[0035] Therefore, one of the preferred embodiments of the present application is as follows: Figures 1 to 11 As shown, a push rod demoulding mechanism includes an upper mold 1, a lower mold 2, a first molding component 4, a second molding component 5 and a demoulding mechanism 3. Of course, the upper mold 1, the lower mold 2, the first molding component 4 and the second molding component 5 cooperate with each other to form a cavity of a plastic product D, wherein

[0036] The first molding component 4 is used for molding the upper undercut A of the plastic product, the second molding component 5 is used for molding the buckle flange B and the hole undercut C of the plastic product, the second molding component 5 is slidably installed on the lower mold 2, the first molding component 4 is slidably installed on the top of the second molding component 5, and the first molding component 4 and the second molding component 5 are both connected and cooperated with the demolding mechanism 3.

[0037] When demoulding, the demoulding mechanism 3 can first drive the second molding component 5 to move in the first direction, so that the second molding component 5 is separated from the formed buckle flange B and the hole undercut C, and the first molding component 4 remains stationary. Subsequently, the demoulding mechanism 3 can drive the first molding component 4 to move in the first direction, so that the first molding component 4 is separated from the formed upper undercut A. When closing the mold, the demoulding mechanism 3 can drive the first molding component 4 and the second molding component 5 to move and reset, and the demoulding mechanism 3 can also lock the reset first molding component 4 and the second molding component 5, so that the first molding component 4 and the second molding component 5 are locked in the state when the mold is closed.

[0038] It should be known that the improvement of the present application over the prior art is: the original entire core block is divided into two parts, namely the first molding component 4 and the second molding component 5, and then the first molding component 4 and the second molding component 5 are demolded in sequence by a step-by-step demolding method, thereby greatly reducing the deformation problem that is prone to occur during traditional one-time demolding, and improving the molding quality of the plastic product D; and when the mold is closed, the demolding mechanism 3 can also move and reset the first molding component 4 and the second molding component 5 after separation, and lock the reset first molding component 4 and the second molding component 5 to ensure that they can maintain the correct position and posture during the next mold closing, thereby improving production efficiency and product quality.

[0039] It should be noted that if Figure 1 As shown in (c) in the figure, the first direction is the x direction, i.e., the direction in which the core block moves to the left and away from the buckle flange B and the hole undercut C. Although the first molding component 4 also moves in the first direction, i.e., the moving direction of the first molding component 4 is inconsistent with the demolding direction of the upper buckle A, the contact area between the first molding component 4 and the plastic product D becomes smaller at this time, so the bonding force between the two becomes smaller, and then the first molding component 4 can be easily separated from the upper buckle A for forced demolding during demolding.

[0040] In one of the embodiments of the present application, Figures 5 to 8 As shown, the demoulding mechanism 3 includes a driving device 302 and a push rod 301. The driving device 302 is installed on the lower mold 2 and the output end is connected to the push rod 301. The push rod 301 cooperates with the first molding component 4 and the second molding component 5 through the guide structure 6. The top end of the push rod 301 has a locking portion 7.

[0041] It should be noted that the specific structure and working principle of the driving device 302 are well-known technologies to those skilled in the art, so they will not be elaborated in detail here; common driving devices 302 include hydraulic cylinders, pneumatic cylinders, and linear motors, etc., and those skilled in the art can choose according to actual needs.

[0042] It can be understood that when demolding is performed, the driving device 302 can drive the push rod 301 to move upward and perform the first process and the second process, wherein in the first process: the push rod 301 can drive the second molding component 5 to move in the first direction through the guide structure 6, at which time the guide structure 6 is disengaged from the first molding component 4, that is, at this time the first molding component 4 is still in cooperation with the upper buckle A and remains stationary.

[0043] The second process: the ejector rod 301 can drive the first molding component 4 to move in the first direction through the guide structure 6, thereby realizing the step-by-step demoulding of the first molding component 4 and the second molding component 5.

[0044] When closing the mold, Figure 6 As shown, the ejector rod 301 can drive the first molding assembly 4 and the second molding assembly 5 to move and reset through the locking portion 7, and the locking portion 7 can lock the reset first molding assembly 4 and the second molding assembly 5.

[0045] As a further description of the above embodiment: Fig.10 and Fig.11 As shown, the guide structure 6 includes an inclined section 602 disposed at the upper end of the top rod 301. It is understandable that when the top rod 301 moves upward, the inclined section 602 can drive the first molding assembly 4 and the second molding assembly 5 to move in the first direction through wedge-shaped extrusion.

[0046] For example, when the inclined section 602 initially moves upward, the inclined section 602 and the second molding component 5 cooperate, and then the second molding component 5 moves in the first direction under the wedge-shaped pressing cooperation of the inclined section 602, and at this time the inclined section 602 and the first molding component 4 are in a disengaged state. When the inclined section 602 continues to move upward and cooperate with the first molding component 4, the first molding component 4 moves in the first direction under the wedge-shaped pressing cooperation of the inclined section 602, thereby realizing the step-by-step demoulding of the first molding component 4 and the second molding component 5.

[0047] like Figure 6 and Fig.11 As shown, the locking portion 7 includes a barb 701 disposed at the top of the ejector rod 301, and an inclined portion 9 is disposed inside the barb 701. It is understandable that when the mold is closed, the ejector rod 301 will drive the barb 701 to move downward, and the inclined portion 9 in the barb 701 can drive the first molding component 4 and the second molding component 5 to move and reset under the wedge-shaped extrusion fit, and the inclined portion 9 can also clamp and resist the reset first molding component 4 and the second molding component 5, thereby achieving the locking of the first molding component 4 and the second molding component 5.

[0048] Further, such as Fig.11As shown, the side of the first molding component 4 and the second molding component 5 are both provided with an inclined surface 10 that matches with the inclined portion 9. It can be understood that, through the provision of the inclined surface 10, when the inclined portion 9 matches with the first molding component 4 and the second molding component 5, the inclined surface 10 can increase the contact area between the inclined portion 9, that is, when the first molding component 4 and the second molding component 5 are locked, the inclined surface 10 and the inclined portion 9 are in a state of abutting and matching, which can greatly improve the limiting locking ability of the barb 701 on both the first molding component 4 and the second molding component 5. At the same time, on the other hand, the provision of the inclined surface 10 can also reduce the stress between the barb 701 and the first molding component 4 and the second molding component 5 when they are matched, thereby reducing the wear between the components and thereby improving the service life.

[0049] One of the embodiments of the present application is as follows: Figure 6 and Fig.11 As shown, the first molding component 4 includes a first core block 401, which is sleeved on the outside of the top rod 301. The guide structure 6 also includes a vertical section 601 arranged at the top of the inclined section 602. The inner walls on both sides of the first core block 401 are respectively provided with an inclined surface 11 and a straight surface 12.

[0050] It is understandable that during demoulding, in the first process, the straight surface 12 is matched with the vertical section 1 601, and the inclined section 602 is disengaged from the inclined surface 11. Figure 6 As shown, during the upward movement of the push rod 301, the straight surface 12 and the vertical section 601 are always in a state of abutment against each other. Therefore, the vertical section 601 is equivalent to a limit lock on the first core block 401, so that the first core block 401 is limited in the first direction, and then when the second molding component 5 moves, the first core block 401 can maintain an absolute limit lock (stationary) state, so that the first core block 401 can ensure a limit support for the upper buckle A of the plastic product D, so that the second molding component 5 will not cause a large deformation of the plastic product D during demolding, thereby ensuring the quality of the plastic product D after demolding.

[0051] In the second process: at this time, the vertical section 601 will be disengaged from the straight surface 12, and then the inclined section 602 will cooperate with the inclined surface 11. The wedge-shaped extrusion of the inclined section 602 and the inclined surface 11 drives the first core block 401 to move in the first direction, thereby realizing the step-by-step demolding of the first molding component 4 and the second molding component 5.

[0052] It is worth mentioning that when the mold is closed, Figure 8As shown, the inclined section 602 will move downward at this time, so the inclined section 602 and the wedge-shaped extrusion of the straight surface 12 can drive the first core block 401 to move and reset, and the original first core block 401 can be driven and reset by the inclined portion 9 on the inner side of the barb 701, that is, now the first core block 401 can be reset by double drive, thereby making the first core block 401 more stable and reliable when the mold is closed.

[0053] In one of the embodiments of the present application, Fig.11 As shown, the second molding assembly 5 includes a second core block 501, which is sleeved on the outside of the top rod 301. The guide structure 6 also includes a vertical section 603 arranged at the bottom end of the inclined section 602. The inner wall of one side of the second core block 501 is provided with a left straight surface 13 and a left inclined surface 14 distributed up and down.

[0054] It is understandable that if Figure 6 and Figure 7 As shown, during the first process, the inclined section 602 cooperates with the wedge-shaped extrusion of the left inclined surface 14 to drive the second core block 501 to move in the first direction. During the second process, the vertical section 603 cooperates with the left straight surface 13 to disengage the inclined section 602 from the left inclined surface 14.

[0055] It should be known that if there is only the inclined section 602, then when the second process is carried out, that is, when the inclined section 602 cooperates with the inclined surface 11 of the first core block 401, the inclined section 602 may also cooperate with the second core block 501 at this time, so that the second core block 501 is still moving in the first direction. This requires that there is enough movement space for the second core block 501 in the mold, and the structure in the mold is compact, which is obviously not in line with the actual situation.

[0056] Therefore, a vertical section 2 603 is provided at the bottom end of the inclined section 602. In the second process, the vertical section 2 603 cooperates with the left straight surface 2 13, so that the cooperation between the inclined section 602 and the left inclined surface 2 14 can be cut off. At this time, the second core block 501 moves to the extreme position in the first direction, and then under the action of the vertical section 2 603, the second core block 501 can still remain stationary.

[0057] Furthermore, in order to realize that the second core block 501 can also realize the function of dual driving and resetting with the first core block 401, as shown in FIG. Fig.11 As shown, the inner wall of the other side of the second core block 501 is provided with a right inclined surface 15 and a right straight surface 16 distributed vertically, and the spacing between the left straight surface 13 and the right straight surface 16 is the same as the width of the vertical section 603 .

[0058] It can be understood that when the first process is performed, the inclined section 602 and the right inclined surface 15 are in contact with each other; when the second process is performed, the vertical section 603 and the right straight surface 16 and the left straight surface 13 are in contact with each other, so that the second core block 501 can stably maintain the limited static state. When the mold is closed, that is, the ejector 301 moves down, the downward-moving inclined section 602 and the right straight surface 16 cooperate in the wedge-shaped extrusion, which can drive the second core block 501 to move and reset. With the action of the barb 701, the dual drive reset function of the second core block 501 can be realized, thereby making the second core block 501 more stable and reliable when the mold is closed.

[0059] It should be known that, by providing the first core block 401 and the second core block 501 with inclined surface 11, straight surface 12, left straight surface 2 13, left inclined surface 2 14, right inclined surface 2 15 and right straight surface 2 16, the push rod 301 can always be in a state of abutting against the first core block 401 and the second core block 501 during the upward or downward movement of the push rod 301. In this way, on the one hand, the tightness of the guide structure 6 on the push rod 301 when cooperating with the first core block 401 and the second core block 501 can be improved, and the transmission efficiency and response efficiency of the first core block 401 and the second core block 501 can be improved; at the same time, the limiting ability of the first core block 401 and the second core block 501 can also be improved, so that when the push rod 301 stops moving, the first core block 401 and the second core block 501 will also maintain a limit locking state as the push rod 301 stops. On the other hand, through such a compact design, the grooves inside the first core block 401 and the second core block 501 can meet the requirements of the guide structure 6, and the design of the grooves can be minimized. The smaller the grooves are, the stronger the strength of the first core block 401 and the second core block 501 can be, so that they can be more stable and reliable during use.

[0060] Further, such as Fig.11 As shown, the barb 701, vertical section 1 601, inclined section 602 and vertical section 2 603 arranged in sequence from top to bottom at the upper end of the top rod 301 are all integrated with the top rod 301. For example, they can be integratedly processed by a machining center, which can make the connection between the several components tighter and improve the overall stability and reliability.

[0061] In this embodiment, Fig.10As shown, the first core block 401 and the second core block 501 can be slidably matched with each other through the dovetail groove structure 8; for example, a dovetail block is provided at the bottom end of the first core block 401, and a dovetail groove body is provided at the top end of the second core block 501, and the dovetail block and the dovetail groove body are slidably matched with each other, and the fit between the two is tight, stable, and not loose, which can further ensure the sliding fit between the first core block 401 and the second core block 501, and has good stability and reliability.

[0062] Another aspect of the present application provides a mold, specifically including the above-mentioned ejector demoulding mechanism.

[0063] The working principle of the utility model is:

[0064] When opening the mold, Figure 3 As shown, first, the upper mold 1 and the lower mold 2 are separated and demolded, and the plastic product D is located in the lower mold 2 at this time, and then the first core block 401 and the second core block 501 are separated and demolded; Figure 6 As shown, at this time, the first core block 401 and the second core block 501 are in a state of being limited and locked under the action of the ejector rod 301. The driving device 302 is started to move the ejector rod 301 upward. The driving device 302 can drive the ejector rod 301 to move upward and perform the first process and the second process, wherein the first process (such as Figure 7 As shown): the upwardly moved push rod 301 acts on the left inclined surface 14 of the second core block 501 through the inclined section 602, and the wedge-shaped extrusion cooperation between the inclined section 602 and the second core block 501 enables the second core block 501 to move in the first direction, that is, the second core block 501 moves to the left and away from the buckle flange B and the hole undercut C of the plastic product D, and the first core block 401 remains stationary.

[0065] In the second process (such as Figure 8 As shown in the figure): the ejector pin 301 continues to move upward, and the inclined section 602 will move upward to act on the inclined surface 11 of the first core block 401. Under the wedge-shaped extrusion cooperation of the inclined surface 11 and the inclined section 602, the first core block 401 can be moved in the first direction, that is, the first core block 401 moves along the upper end of the second core block 501 and away from the upper undercut A of the plastic product D. At this time, the second core block 501 remains stationary; thereby completing the demoulding of the two core blocks, and finally cooperating with the ejector pin structure of the mold itself to eject the plastic product D.

[0066] Of course, when preparing for the next injection molding of the mold, the two core blocks need to be reset. Similarly, the driving device 302 is started to move the ejector rod 301 downward. Figure 8 to Figure 7As shown in FIG. 1 , the downwardly moved push rod 301 acts on the straight surface 12 of the first core block 401 through the inclined section 602, and the first core block 401 can be reversed (moved rightward) to the initial position under the wedge-shaped extrusion cooperation of the inclined section 602 and the straight surface 12. When the push rod 301 continues to move downward, as shown in FIG. Figure 7 to Figure 6 As shown, at this time, the inclined section 602 of the ejector pin 301 can make the second core block 501 move in the reverse direction (rightwardly) to the initial position through the wedge-shaped extrusion cooperation with the right inclined surface 15 of the second core block 501.

[0067] Finally, if Figure 6 As shown, when the ejector pin 301 moves down to the limit position, the first core block 401 and the second core block 501 have moved to the appropriate position of the mold, and the barb 701 at the top of the ejector pin 301 will abut against the side position of the first core block 401 and the second core block 501, thereby locking the first core block 401 and the second core block 501. Figure 6 As shown, at this time, the inclined section 602 is against the right inclined surface 15 of the second core block 501, and the vertical section 601 and the straight surface 12 of the first core block 401 are also in a state of abutment, so that the two core blocks can be locked and limited. In conjunction with the barb 701, double locking and limiting of the two core blocks can be achieved, which greatly improves stability.

[0068] The above describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited by the above embodiments, and the above embodiments and the specification only describe the principles of the present application. The present application may have various changes and improvements without departing from the spirit and scope of the present application, and these changes and improvements fall within the scope of the present application for which protection is sought. The scope of protection claimed by the present application is defined by the attached claims and their equivalents.

Claims

1. A push rod demoulding mechanism, characterized in that: include: A first molding assembly, a second molding assembly, a driving device and a push rod, wherein the first molding assembly is used for molding an upper undercut of a plastic product, and the second molding assembly is used for molding a buckle flange and a hole undercut of a plastic product, the second molding assembly is slidably mounted on the lower mold, the first molding assembly is slidably mounted on the top of the second molding assembly, the driving device is mounted on the lower mold and the output end is connected to the push rod, and the push rod cooperates with the first molding assembly and the second molding assembly through a guide structure; When demoulding is performed, the driving device is suitable for driving the ejector rod to move upward and perform a first process and a second process, wherein in the first process: the ejector rod is suitable for driving the second molding component to move in a first direction through the guide structure, at which time the guide structure is disengaged from the first molding component; in the second process: the ejector rod is suitable for driving the first molding component to move in the first direction through the guide structure; When the mold is closed, the ejector rod is suitable for driving the first molding assembly and the second molding assembly to move and reset through the guide structure and locking the reset first molding assembly and the second molding assembly.

2. The ejector demoulding mechanism according to claim 1, characterized in that: The first molding assembly includes a first core block, the first core block is sleeved on the outside of the push rod, the guide structure includes an inclined section arranged at the upper end of the push rod and a vertical section 1 arranged at the top of the inclined section, and the inner walls on both sides of the first core block are respectively provided with an inclined surface 1 and a straight surface 1; When the first process is carried out, the straight surface 1 cooperates with the vertical section 1, and the inclined section is disengaged from the inclined surface 1, so that the first core block remains stationary; when the second process is carried out, the inclined section cooperates with the wedge-shaped extrusion of the inclined surface 1 to drive the first core block to move in the first direction; when the mold is closed, the inclined section cooperates with the wedge-shaped extrusion of the straight surface 1 to drive the first core block to move and reset, and the inclined section and the straight surface 1 are in a state of abutment.

3. The ejector demoulding mechanism according to claim 2, characterized in that: The second molding assembly includes a second core block, the second core block is sleeved on the outside of the ejector rod, the guide structure also includes a second vertical section arranged at the bottom end of the inclined section, and an inner wall of one side of the second core block is provided with a second left straight surface and a second left inclined surface distributed up and down; During the first process, the inclined section cooperates with the wedge-shaped extrusion of the left inclined surface 2 to drive the second core block to move in the first direction; during the second process, the vertical section 2 cooperates with the left straight surface 2 to disengage the inclined section from the left inclined surface 2.

4. The ejector demoulding mechanism according to claim 3, characterized in that: The inner wall of the other side of the second core block is provided with a right inclined surface 2 and a right straight surface 2 distributed up and down, and the distance between the left straight surface 2 and the right straight surface 2 is the same as the width of the vertical section 2; During the first process, the inclined section is in abutment with the second right inclined surface; during the second process, the second vertical section is in abutment with the second right straight surface and the second left straight surface, so that the second core block remains stationary; when the mold is closed, the inclined section is in a wedge-shaped extrusion with the second right straight surface to drive the second core block to move and reset, and the inclined section is in abutment with the second right inclined surface.

5. The ejector demoulding mechanism according to claim 4, characterized in that: The top end of the ejector rod has a locking portion; when the mold is closed, the locking portion is suitable for re-locking the reset first molding component and the second molding component.

6. The ejector demoulding mechanism according to claim 5, characterized in that: The locking portion includes a barb arranged at the top end of the ejector rod; when the mold is closed, the barb is suitable for clamping and abutting against the reset first molding component and the second molding component.

7. The ejector demoulding mechanism according to claim 6, characterized in that: An inclined portion is provided on the inner side of the barb, and the sides of the first molding component and the second molding component are both provided with inclined surfaces matching the inclined portion; when the first molding component and the second molding component are locked, the inclined surface and the inclined portion are in abutment with each other.

8. The ejector demoulding mechanism according to claim 6, characterized in that: The barb, the vertical section 1, the inclined section and the vertical section 2 which are arranged in sequence from top to bottom on the upper end of the push rod are all formed integrally with the push rod.

9. The ejector demoulding mechanism according to claim 3, characterized in that: The first core block and the second core block are slidably matched via a dovetail groove structure.

10. A mold, characterized in that: It comprises a push rod demoulding mechanism as described in any one of claims 1 to 9.

Images