Plastic nut internal thread demolding mechanism and demolding method

Abstract

The invention relates to the technical field of plastic mold manufacturing, in particular to a plastic nut internal thread demolding mechanism and demolding method.The plastic nut internal thread demolding mechanism comprises a base, an inner mold, an outer mold and a demolding assembly; the inner mold comprises a first mold base fixedly arranged on the upper surface of the base and a through hole formed in the surface of the first mold base, and three first mold petals and three second mold petals are arranged on the inner wall of the through hole in a sliding mode; the outer mold comprises a second mold base and a mold cover fixedly arranged on the surface of the second mold base; through the arrangement of the inner mold, the outer mold and the demolding assembly, the purpose of mold shrinkage can be achieved, a plastic nut subjected to injection molding can be taken down conveniently, then the demolding mechanism remarkably simplifies a traditional rotary demolding complex structure, the failure rate is reduced, meanwhile, the problem of thread orientation limitation is solved, the demolding efficiency and production convenience are greatly improved, and the production cost is reduced. And multi-cavity production can be realized on an injection molding machine with the same tonnage, the period time is shortened, and the orientation requirement of a high-precision thread product is met.

Description

Technical Field

[0001] This application relates to the field of plastic mold manufacturing technology, and in particular to a demolding mechanism and demolding method for the internal thread of a plastic nut. Background Technology

[0002] In the manufacturing process of plastic nuts, the forming and demolding of the internal thread are key steps. Traditional molds for the internal thread of plastic nuts have many drawbacks in practical applications.

[0003] Traditional plastic nut internal thread molds typically use hydraulic cylinders or motors to rotate the threaded rod core for demolding. Because of their complex structure, these molds have a high failure rate during mass production. The molds require rotation for demolding, resulting in a long cycle time for each mold and making it difficult to increase production capacity during mass production.

[0004] Therefore, traditional plastic nut internal thread molds require a hydraulic cylinder or motor to drive rotation. For products with requirements on the starting position of the thread, it is difficult to achieve the orientation of the thread relative to the product position, thus failing to meet the design requirements of such products.

[0005] Therefore, this application provides a demolding mechanism and demolding method for the internal threads of a plastic nut. Summary of the Invention

[0006] The purpose of this application is to solve at least one technical problem raised in the background art.

[0007] This application provides a demolding mechanism for the internal threads of a plastic nut, including a base, an inner mold, an outer mold, and a demolding assembly; The inner mold includes a first mold base fixed to the upper surface of the base, and a through hole opened on the surface of the first mold base. Three first mold segments and three second mold segments are slidably arranged on the inner wall of the through hole, and the three first mold segments and three second mold segments form a cylindrical structure. Limiting sliders are fixed on the outer surfaces of the ends of the first mold segments and the second mold segments. A limiting slide cavity for the six limiting sliders to slide is opened on the inner wall of the through hole. A conical hole is opened on the inner wall of the three first mold segments and the three second mold segments. A conical mold core is slidably arranged on the inner wall of the conical hole. An operating rod for driving the conical mold core to move axially is fixed at the end of the conical mold core. The outer mold includes a second mold base and a mold cover fixed to the surface of the second mold base.

[0008] Preferably, the outer surface of the conical mold core is provided with three first dovetail sliders in a circumferential array, the outer surface of the conical mold core is provided with three first dovetail grooves in a circumferential array, the inner wall of the first mold lobe is provided with a second dovetail groove that is slidably connected to the first dovetail sliders, and the inner wall of the second mold lobe is provided with a second dovetail slider that is slidably connected to the inner wall of the first dovetail groove.

[0009] By adopting the above technical solution, when the conical mold core moves to the left, the three first mold segments and three second mold segments can be automatically reduced in size under the action of the first dovetail slider, the first dovetail groove, the second dovetail groove and the second dovetail slider. At the same time, when the conical mold core moves to the right, automatic mold expansion can be achieved.

[0010] Preferably, the demolding assembly includes a horizontal plate fixed to the upper surface of the first mold base and a rectangular groove formed on the lower surface of the horizontal plate. A rectangular block is slidably disposed on the inner wall of the rectangular groove. The top end of the second mold base is fixedly connected to the bottom end of the rectangular block. A drive motor for driving the rectangular block to move is disposed on the side of the horizontal plate.

[0011] By adopting the above technical solution, the movement of the rectangular block can drive the second mold base to move automatically.

[0012] Preferably, the output end of the drive motor extends into the interior of the rectangular groove and is fixedly provided with a first threaded post. Two symmetrical limiting rods are fixedly provided on the inner wall of the rectangular groove. The side of the rectangular block is provided with a threaded hole that is threadedly connected to the outer surface of the first threaded post. The side of the rectangular block is also provided with limiting holes that are slidably connected to the surfaces of the two limiting rods respectively.

[0013] By adopting the above technical solution, the rectangular block can be moved automatically by the rotation of the first threaded column.

[0014] Preferably, the demolding assembly further includes a fixing plate fixed to the upper surface of the base and a hydraulic cylinder fixed to the side of the fixing plate, wherein the telescopic end of the hydraulic cylinder is fixedly connected to the end of the operating rod.

[0015] By adopting the above technical solution, the conical mold core can be automatically moved to the left by the contraction of the hydraulic cylinder, thereby achieving the purpose of automatic mold shrinkage.

[0016] Preferably, the demolding assembly further includes a connecting plate fixed to the end of the horizontal plate. The lower surface of the connecting plate is provided with a strip groove. The end of the first threaded post extends into the interior of the strip groove and is fixed with a second threaded post. A strip plate is slidably provided on the inner wall of the strip groove. A threaded hole is provided on the side of the strip plate that is threadedly connected to the outer surface of the second threaded post.

[0017] By adopting the above technical solution, the rotation of the first threaded column can drive the second threaded column to rotate automatically, thereby driving the strip plate to move automatically through the rotation of the second threaded column.

[0018] Preferably, the bottom end of the strip plate is fixedly provided with a sleeve corresponding to the operating rod, the operating rod is slidably connected to the inner wall of the sleeve, the end of the operating rod is fixedly provided with a cross-shaped slide plate, and the inner wall of the sleeve is provided with a cross-shaped slide groove that is slidably connected to the outer surface of the cross-shaped slide plate.

[0019] By adopting the above technical solution, when the mold cover moves to the right and is not completely detached, it can drive the sleeve to move and make the cross-shaped slide plate slide on the inner wall of the cross-shaped slide groove. When the mold cover moves to the right and is completely detached, the cross-shaped slide plate is pressed against the rightmost end of the cross-shaped slide groove. The continued movement of the sleeve can drive the operating lever to move automatically to the left.

[0020] Preferably, the outer surface of the first mold base is provided with an ejector assembly, the ejector assembly includes a transverse hole formed on the surface of the first mold base and penetrating the first mold base, and a transverse rod slidably disposed on the inner wall of the transverse hole. One end of the transverse rod is fixedly provided with an annular ejector plate, the surface of the first mold base is fixedly provided with a first oil cylinder, the end of the transverse rod extends into the interior of the first oil cylinder and is fixedly provided with a first piston, the surface of the strip plate is provided with a circular hole for the first oil cylinder to slide, and the end of the first oil cylinder is provided with an oil pipe extending into the interior of the first oil cylinder.

[0021] By adopting the above technical solution, oil can be injected into the interior of the first oil cylinder through the oil pipe to push the first piston, thereby pushing the transverse rod outward and driving the annular top material plate to move automatically to the right.

[0022] Preferably, an L-shaped plate is fixedly provided at the end of the connecting plate, a second oil cylinder is fixedly provided on the surface of the L-shaped plate, a second piston is slidably provided on the inner wall of the second oil cylinder, a connecting rod is fixedly provided on the surface of the second piston, the other end of the connecting rod extends to the outer surface of the second oil cylinder, the end of the oil pipe away from the first oil cylinder extends into the interior of the second oil cylinder, and the interior of the second oil cylinder is filled with hydraulic oil, a sealing hole for the connecting rod to slide is provided at the end of the second oil cylinder, and a return spring is provided inside the second oil cylinder, with both ends of the return spring fixedly connected to the inner wall of the second oil cylinder and the end of the second piston, respectively.

[0023] By adopting the above technical solution, the movement of the strip plate can contact the end of the connecting rod and squeeze the connecting rod, so that the connecting rod drives the second piston to move on the inner wall of the second oil cylinder. The movement of the second piston can transport the hydraulic oil in the second oil cylinder to the first oil cylinder through the oil pipe. Moreover, the setting of the return spring makes it easy to draw the hydraulic oil in the first oil cylinder back into the second oil cylinder.

[0024] The present invention also provides a method for demolding the internal threads of a plastic nut, comprising the following steps: S1. Separate the outer mold, start the drive motor to drive the first threaded column to rotate, and drive the rectangular block and the second mold base to move automatically to the right to achieve the separation of the mold cover; S2. Inner mold shrinkage: The hydraulic cylinder is activated to shrink, which drives the operating lever to move automatically to the left, thereby driving the conical mold core to move automatically to the left, realizing the automatic shrinkage of the three first mold segments and the three second mold segments; S3. Unload the material and remove the plastic nut from the inner mold.

[0025] In summary, this application includes at least one of the following beneficial technical effects: 1. The demolding mechanism and method for the internal thread of a plastic nut described in this application, by setting an inner mold, an outer mold, and a demolding assembly, can start a drive motor to rotate the first threaded column when demolding the internal thread of the plastic nut. The rotation of the first threaded column causes the rectangular block to move to the right, thereby causing the mold cover to separate from the first mold piece and the second mold piece. Then, the hydraulic cylinder is activated to retract, causing the operating rod and the conical mold core to move to the left. When the conical mold core moves to the left, it can drive the three first mold pieces and the three second mold pieces to retract to the middle simultaneously under the action of the first dovetail slider, the first dovetail groove, the second dovetail groove, and the second dovetail slider, achieving the purpose of mold shrinkage. This makes it easier to remove the injection-molded plastic nut. This demolding mechanism significantly simplifies the complex structure of traditional rotary demolding, reduces the failure rate, avoids the problem of thread orientation restriction, greatly improves demolding efficiency and production convenience, and can realize multi-cavity production on the same tonnage injection molding machine, shortening the cycle time and meeting the orientation requirements of high-precision threaded products.

[0026] 2. The demolding mechanism and method for internal threads of a plastic nut described in this application, by setting up a demolding component, during the process of the mold cover being moved outward by the rotation of the drive motor, the rotation of the first threaded column can drive the rotation of the second threaded column, and the rotation of the second threaded column can drive the strip plate to move to the left. During the process of the strip plate moving to the left, it can drive the sleeve to move to the left. At this time, the cross-shaped slide at the end of the operating rod can slide in the cross-shaped groove inside the sleeve. When the mold cover is just completely separated from the first mold piece and the second mold piece, the cross-shaped slide is pressed against the rightmost end of the cross-shaped groove. When the drive motor drives the mold cover to continue to move outward, the sleeve can drive the operating rod to move to the left under the action of the cross-shaped slide, thereby driving the conical mold core to move automatically to the left, thus achieving the purpose of automatic mold shrinkage during the process of mold cover separation.

[0027] 3. The demolding mechanism and method for internal threads of a plastic nut described in this application, by setting up an ejector assembly, when the drive motor rotates and drives the mold cover to detach, and during the process of driving the mold shrinkage, the movement of the strip plate can contact the end of the connecting rod and squeeze the connecting rod, causing the connecting rod to drive the second piston to move on the inner wall of the second oil cylinder. The movement of the second piston can transport the hydraulic oil in the second oil cylinder to the first oil cylinder through the oil pipe, and drive the first piston in the first oil cylinder to move to the right. The movement of the first piston to the right can drive the transverse rod to move to the right, and the movement of the transverse rod to the right can drive the annular ejector plate to move to the right, pushing the plastic lock nuts on the first mold piece and the second mold piece outward, thereby achieving the purpose of automatic ejection and unloading. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of this application; Figure 2 This is a schematic diagram of the structure of the first mold lobe, the second mold lobe, and the conical mold core in Embodiment 1 of this application; Figure 3 This is a three-dimensional structural diagram of the conical mold core in Embodiment 1 of this application; Figure 4 This is a rear view structural diagram of Embodiment 1 of this application; Figure 5 This is a side view of the structure of Embodiment 1 of this application; Figure 6 This is a bottom view of the structure of Embodiment 1 of this application; Figure 7 This is a schematic diagram of the overall structure of Embodiment 2 of this application; Figure 8 This is a rear view structural diagram of Embodiment 2 of this application; Figure 9 This is a cross-sectional structural diagram of Embodiment 2 of this application; Figure 10 This application Figure 9 Enlarged structural diagram at point A in the middle.

[0029] Explanation of reference numerals in the attached figures: 100. Base; 200. Inner mold; 201. First mold base; 202. First mold segment; 203. Second mold segment; 204. Limiting slider; 205. Conical mold core; 206. Operating lever; 207. First dovetail slider; 208. First dovetail groove; 209. Second dovetail groove; 2010. Second dovetail slider; 300. Outer mold; 301. Second mold base; 302. Mold cover; 400. Demolding assembly; 401. Horizontal plate; 402. Rectangular block; 403. Drive motor; 404. First threaded post; 405. Limiting rod; 406. Fixing plate; 407. Hydraulic cylinder; 408. Connecting plate; 409. Second threaded post; 4010. Strip plate; 4011. Sleeve; 4012. Cross-shaped slide plate; 4013. Cross-shaped groove; 500, Top material assembly; 501, Horizontal rod; 502, Annular top material plate; 503, First oil cylinder; 504, First piston; 505, Oil pipe; 506, L-shaped plate; 507, Second oil cylinder; 508, Second piston; 509, Connecting rod; 5010, Return spring. Detailed Implementation

[0030] The following combination Figures 1 to 10 This application will be described in further detail below.

[0031] Example 1 Please refer to the following carefully. Figures 1 to 6 A demolding mechanism for internal threads of a plastic nut includes a base 100, an inner mold 200, an outer mold 300, and a demolding assembly 400. The inner mold 200 includes a first mold base 201 fixed to the upper surface of the base 100, and a through hole formed on the surface of the first mold base 201. Three first mold segments 202 and three second mold segments 203 are slidably disposed on the inner wall of the through hole, and the three first mold segments 202 and three second mold segments 203 form a cylindrical structure. The first mold segments 202 and the second mold segments 203... The outer surface of each end is fixed with a limiting slider 204, and the inner wall of the through hole is provided with a limiting slide cavity for the six limiting sliders 204 to slide. The inner walls of the three first mold segments 202 and the three second mold segments 203 are provided with tapered holes. A tapered mold core 205 is slidably provided on the inner wall of the tapered hole. The end of the tapered mold core 205 is fixed with an operating rod 206 for driving the tapered mold core 205 to move axially. The outer mold 300 includes a second mold base 301 and a mold cover 302 fixed on the surface of the second mold base 301.

[0032] Please refer to this carefully. Figure 2 , Figure 3 The outer surface of the conical mold core 205 is provided with three first dovetail sliders 207 arranged in a circumferential array. The outer surface of the conical mold core 205 is provided with three first dovetail grooves 208 arranged in a circumferential array. The inner wall of the first mold lobe 202 is provided with a second dovetail groove 209 that is slidably connected to the first dovetail sliders 207. The inner wall of the second mold lobe 203 is provided with a second dovetail slider 2010 that is slidably connected to the inner wall of the first dovetail groove 208.

[0033] Specifically, when the conical mold core 205 moves to the left, the three first mold segments 202 and the three second mold segments 203 can automatically shrink under the action of the first dovetail slider 207, the first dovetail groove 208, the second dovetail groove 209 and the second dovetail slider 2010. At the same time, when the conical mold core 205 moves to the right, it can automatically expand the mold.

[0034] Please refer to this carefully. Figure 4 , Figure 6 The demolding assembly 400 includes a horizontal plate 401 fixed on the upper surface of the first mold base 201 and a rectangular groove formed on the lower surface of the horizontal plate 401. A rectangular block 402 is slidably disposed on the inner wall of the rectangular groove. The top end of the second mold base 301 is fixedly connected to the bottom end of the rectangular block 402. A drive motor 403 for driving the rectangular block 402 to move is disposed on the side of the horizontal plate 401.

[0035] Specifically, the movement of the rectangular block 402 can drive the second mold base 301 to move automatically.

[0036] Please refer to this carefully. Figure 5 , Figure 6The output end of the drive motor 403 extends into the interior of the rectangular groove and is fixed with a first threaded post 404. Two symmetrical limiting rods 405 are fixed on the inner wall of the rectangular groove. The side of the rectangular block 402 is provided with a threaded hole that is threaded to the outer surface of the first threaded post 404. The side of the rectangular block 402 is also provided with limiting holes that are slidably connected to the surfaces of the two limiting rods 405 respectively.

[0037] Specifically, the rectangular block 402 can be moved automatically by rotating the first threaded post 404.

[0038] Please refer to this carefully. Figure 4 , Figure 5 The demolding assembly 400 also includes a fixing plate 406 fixed on the upper surface of the base 100, and a hydraulic cylinder 407 fixed on the side of the fixing plate 406. The telescopic end of the hydraulic cylinder 407 is fixedly connected to the end of the operating rod 206.

[0039] Specifically, the retraction of the hydraulic cylinder 407 can drive the conical mold core 205 to move automatically to the left, thereby achieving the purpose of automatic mold shrinkage.

[0040] In this embodiment, by setting an inner mold 200, an outer mold 300, and a demolding assembly 400, when demolding the internal threads of the plastic nut, the drive motor 403 can be activated to drive the first threaded post 404 to rotate. The rotation of the first threaded post 404 causes the rectangular block 402 to move to the right, thereby causing the mold cover 302 to disengage from the first mold segment 202 and the second mold segment 203. Then, the hydraulic cylinder 407 is activated to retract, causing the operating rod 206 and the conical mold core 205 to move to the left. When the conical mold core 205 moves to the left, it can move the first dovetail slider 207 and the first... Under the action of the dovetail groove 208, the second dovetail groove 209, and the second dovetail slider 2010, the three first mold segments 202 and the three second mold segments 203 simultaneously shrink towards the middle, achieving the purpose of mold shrinkage. This facilitates the removal of the plastic nut after injection molding, thus significantly simplifying the complex structure of traditional rotary demolding, reducing the failure rate, avoiding the problem of thread orientation restriction, greatly improving demolding efficiency and production convenience, and enabling multi-cavity production on injection molding machines of the same tonnage, shortening the cycle time, and meeting the orientation requirements of high-precision threaded products.

[0041] The above embodiments provide a method for demolding the internal threads of a plastic nut, including the following steps: S1. Separate the outer mold 300, start the drive motor 403 to drive the first threaded post 404 to rotate, and drive the rectangular block 402 and the second mold base 301 to move automatically to the right to realize the separation of the mold cover 302; S2, the inner mold 200 shrinks, the hydraulic cylinder 407 is activated to shrink, which drives the operating lever 206 to move automatically to the left, thereby driving the conical mold core 205 to move automatically to the left, realizing the automatic shrinking of the three first mold segments 202 and the three second mold segments 203; S3. Remove the plastic nut from the inner mold 200.

[0042] Example 2 Based on Example 1, referring to Figures 7 to 10 And unlike Example 1, the following is true: Please refer to this carefully. Figure 9 , Figure 10 The demolding assembly 400 also includes a connecting plate 408 fixed to the end of the horizontal plate 401. The lower surface of the connecting plate 408 is provided with a strip groove. The end of the first threaded post 404 extends into the interior of the strip groove and is fixed with a second threaded post 409. The thread directions of the first threaded post 404 and the second threaded post 409 are opposite. A strip plate 4010 is slidably provided on the inner wall of the strip groove. The side of the strip plate 4010 is provided with a threaded hole that is threadedly connected to the outer surface of the second threaded post 409.

[0043] Specifically, the rotation of the first threaded post 404 can drive the second threaded post 409 to rotate automatically, thereby driving the strip plate 4010 to move automatically through the rotation of the second threaded post 409.

[0044] Please refer to this carefully. Figure 9 , Figure 10 The bottom end of the strip plate 4010 is fixed with a sleeve 4011 corresponding to the operating rod 206. The operating rod 206 is slidably connected to the inner wall of the sleeve 4011. The end of the operating rod 206 is fixed with a cross-shaped slide plate 4012. The inner wall of the sleeve 4011 is provided with a cross-shaped slide groove 4013 that is slidably connected to the outer surface of the cross-shaped slide plate 4012.

[0045] Specifically, when the mold cover 302 moves to the right and is not completely disengaged, it can drive the sleeve 4011 to move and make the cross-shaped slide plate 4012 slide on the inner wall of the cross-shaped slide groove 4013. When the mold cover 302 moves to the right and is completely disengaged, the cross-shaped slide plate 4012 is pressed against the rightmost end of the cross-shaped slide groove 4013. The continued movement of the sleeve 4011 can drive the operating lever 206 to move automatically to the left.

[0046] In this invention, by setting up a demolding component 400, during the outward movement of the mold cover 302 driven by the rotation of the drive motor 403, the rotation of the first threaded post 404 can drive the rotation of the second threaded post 409. The rotation of the second threaded post 409 drives the strip plate 4010 to move to the left. During the leftward movement of the strip plate 4010, it can drive the sleeve 4011 to move to the left. At this time, the cross-shaped slide plate 4012 at the end of the operating lever 206 can move within the cross-shaped slide plate 4011 inside the sleeve 4011. Sliding within the groove 4013, when the mold cover 302 is just completely separated from the first mold segment 202 and the second mold segment 203, the cross-shaped slide plate 4012 abuts against the rightmost end of the cross-shaped slide groove 4013. When the drive motor 403 drives the mold cover 302 to continue moving outward, the sleeve 4011 can drive the operating rod 206 to move to the left under the action of the cross-shaped slide plate 4012, thereby driving the conical mold core 205 to move automatically to the left, thus achieving the purpose of automatic mold shrinkage during the process of the mold cover 302 separating.

[0047] Please refer to this carefully. Figure 8 , Figure 10 The outer surface of the first mold base 201 is provided with an ejector assembly 500. The ejector assembly 500 includes a transverse hole opened on the surface of the first mold base 201 and passing through the first mold base 201, and a transverse rod 501 slidably disposed on the inner wall of the transverse hole. One end of the transverse rod 501 is fixedly provided with an annular ejector plate 502. A first oil cylinder 503 is fixedly provided on the surface of the first mold base 201. The end of the transverse rod 501 extends into the interior of the first oil cylinder 503 and is fixedly provided with a first piston 504. The surface of the strip plate 4010 is provided with a circular hole for the first oil cylinder 503 to slide. The end of the first oil cylinder 503 is provided with an oil pipe 505 extending into the interior of the first oil cylinder 503.

[0048] Specifically, oil can be injected into the first oil cylinder 503 through the oil pipe 505 to push the first piston 504, thereby pushing the transverse rod 501 outward, which in turn drives the annular top material plate 502 to move automatically to the right.

[0049] Please refer to this carefully. Figure 9 , Figure 10An L-shaped plate 506 is fixedly provided at the end of the connecting plate 408. A second oil cylinder 507 is fixedly provided on the surface of the L-shaped plate 506. A second piston 508 is slidably provided on the inner wall of the second oil cylinder 507. A connecting rod 509 is fixedly provided on the surface of the second piston 508. The other end of the connecting rod 509 extends to the outer surface of the second oil cylinder 507. The end of the oil pipe 505 away from the first oil cylinder 503 extends into the interior of the second oil cylinder 507. The interior of the second oil cylinder 507 is filled with hydraulic oil. A sealing hole for the connecting rod 509 to slide is provided at the end of the second oil cylinder 507. A return spring 5010 is provided inside the second oil cylinder 507. The two ends of the return spring 5010 are fixedly connected to the inner wall of the second oil cylinder 507 and the end of the second piston 508, respectively.

[0050] Specifically, the movement of the strip plate 4010 can contact the end of the connecting rod 509 and squeeze the connecting rod 509, causing the connecting rod 509 to drive the second piston 508 to move on the inner wall of the second oil cylinder 507. The movement of the second piston 508 can transport the hydraulic oil in the second oil cylinder 507 to the first oil cylinder 503 through the oil pipe 505. Moreover, the setting of the return spring 5010 makes it easy to draw the hydraulic oil in the first oil cylinder 503 back into the second oil cylinder 507.

[0051] In this invention, by setting up an ejector assembly 500, when the drive motor 403 rotates and drives the mold cover 302 to disengage, and during the process of driving the mold shrinkage, the movement of the strip plate 4010 can contact the end of the connecting rod 509 and squeeze the connecting rod 509, causing the connecting rod 509 to drive the second piston 508 to move on the inner wall of the second oil cylinder 507. The movement of the second piston 508 can transport the hydraulic oil in the second oil cylinder 507 to the first oil cylinder 503 through the oil pipe 505, and drive the first piston 504 in the first oil cylinder 503 to move to the right. The rightward movement of the first piston 504 can drive the transverse rod 501 to move to the right, and the rightward movement of the transverse rod 501 can drive the annular ejector plate 502 to move to the right, pushing the plastic lock nuts on the first mold segment 202 and the second mold segment 203 outward, thereby achieving the purpose of automatic ejection and unloading.

[0052] The above embodiments provide a method for demolding the internal threads of a plastic nut, including the following steps: S1. Separate the outer mold 300, start the drive motor 403 to drive the first threaded post 404 to rotate, and drive the rectangular block 402 and the second mold base 301 to move automatically to the right to realize the separation of the mold cover 302; S2, Inner mold 200 shrinks the mold. When the mold cover 302 is disengaged by the rotation of the drive motor 403, the sleeve 4011 and the operating rod 206 move automatically to achieve automatic mold shrinking. S3. Unloading: During the process of the mold cover 302 being disengaged and the mold being automatically reduced by the rotation of the drive motor 403, the horizontal rod 501 and the annular ejector plate 502 are automatically moved to the right to realize the automatic ejection and unloading of the plastic nut.

Claims

1. A demolding mechanism for the internal threads of a plastic nut, characterized in that, Includes a base (100), an inner mold (200), an outer mold (300), and a demolding assembly (400); The inner mold (200) includes a first mold base (201) fixed on the upper surface of the base (100) and a through hole opened on the surface of the first mold base (201). The inner wall of the through hole is slidably provided with three first mold segments (202) and three second mold segments (203), and the three first mold segments (202) and three second mold segments (203) form a cylindrical structure. The outer surfaces of the ends of the first mold segments (202) and the second mold segments (203) are all fixedly provided with limiting sliders (204). The inner wall of the through hole is provided with a limiting slide cavity for the six limiting sliders (204) to slide. The inner walls of the three first mold segments (202) and the three second mold segments (203) are provided with tapered holes. The inner walls of the tapered holes are slidably provided with tapered mold cores (205). The end of the tapered mold cores (205) is fixedly provided with an operating rod (206) for driving the tapered mold cores (205) to move axially. The outer mold (300) includes a second mold base (301) and a mold cover (302) fixed on the surface of the second mold base (301).

2. The demolding mechanism for internal threads of a plastic nut according to claim 1, characterized in that, The outer surface of the conical mold core (205) is provided with three first dovetail sliders (207) arranged in a circumferential array. The outer surface of the conical mold core (205) is provided with three first dovetail grooves (208) arranged in a circumferential array. The inner wall of the first mold lobe (202) is provided with a second dovetail groove (209) that is slidably connected to the first dovetail sliders (207). The inner wall of the second mold lobe (203) is provided with a second dovetail slider (2010) that is slidably connected to the inner wall of the first dovetail groove (208).

3. The demolding mechanism for internal threads of a plastic nut according to claim 1, characterized in that, The demolding assembly (400) includes a horizontal plate (401) fixed on the upper surface of the first mold base (201) and a rectangular groove opened on the lower surface of the horizontal plate (401). A rectangular block (402) is slidably disposed on the inner wall of the rectangular groove. The top end of the second mold base (301) is fixedly connected to the bottom end of the rectangular block (402). A drive motor (403) for driving the rectangular block (402) to move is provided on the side of the horizontal plate (401).

4. The demolding mechanism for internal threads of a plastic nut according to claim 3, characterized in that, The output end of the drive motor (403) extends into the interior of the rectangular groove and is fixedly provided with a first threaded post (404). Two symmetrical limiting rods (405) are fixedly provided on the inner wall of the rectangular groove. The side of the rectangular block (402) is provided with a threaded hole that is threadedly connected to the outer surface of the first threaded post (404). The side of the rectangular block (402) is also provided with limiting holes that are slidably connected to the surfaces of the two limiting rods (405).

5. The demolding mechanism for internal threads of a plastic nut according to claim 4, characterized in that, The demolding assembly (400) also includes a fixing plate (406) fixed on the upper surface of the base (100) and a hydraulic cylinder (407) fixed on the side of the fixing plate (406), wherein the telescopic end of the hydraulic cylinder (407) is fixedly connected to the end of the operating rod (206).

6. The demolding mechanism for internal threads of a plastic nut according to claim 4, characterized in that, The demolding assembly (400) further includes a connecting plate (408) fixed to the end of the horizontal plate (401). The lower surface of the connecting plate (408) is provided with a strip groove. The end of the first threaded post (404) extends into the interior of the strip groove and is fixed with a second threaded post (409). A strip plate (4010) is slidably provided on the inner wall of the strip groove. The side of the strip plate (4010) is provided with a threaded hole that is threadedly connected to the outer surface of the second threaded post (409).

7. A demolding mechanism for internal threads of a plastic nut according to claim 6, characterized in that, The bottom end of the strip plate (4010) is fixedly provided with a sleeve (4011) corresponding to the operating rod (206). The operating rod (206) is slidably connected to the inner wall of the sleeve (4011). The end of the operating rod (206) is fixedly provided with a cross-shaped slide plate (4012). The inner wall of the sleeve (4011) is provided with a cross-shaped slide groove (4013) that is slidably connected to the outer surface of the cross-shaped slide plate (4012).

8. A plastic nut internal thread demolding mechanism according to claim 7, characterized in that, The outer surface of the first mold base (201) is provided with an ejector assembly (500). The ejector assembly (500) includes a transverse hole opened on the surface of the first mold base (201) and passing through the first mold base (201), and a transverse rod (501) slidably disposed on the inner wall of the transverse hole. One end of the transverse rod (501) is fixedly provided with an annular ejector plate (502). A first oil cylinder (503) is fixedly provided on the surface of the first mold base (201). The end of the transverse rod (501) extends into the interior of the first oil cylinder (503) and is fixedly provided with a first piston (504). The surface of the strip plate (4010) is provided with a circular hole for the first oil cylinder (503) to slide. The end of the first oil cylinder (503) is provided with an oil pipe (505) extending into the interior of the first oil cylinder (503).

9. A demolding mechanism for internal threads of a plastic nut according to claim 8, characterized in that, An L-shaped plate (506) is fixedly provided at the end of the connecting plate (408). A second oil cylinder (507) is fixedly provided on the surface of the L-shaped plate (506). A second piston (508) is slidably provided on the inner wall of the second oil cylinder (507). A connecting rod (509) is fixedly provided on the surface of the second piston (508). The other end of the connecting rod (509) extends to the outer surface of the second oil cylinder (507). The end of the oil pipe (505) away from the first oil cylinder (503) extends into the interior of the second oil cylinder (507). The interior of the second oil cylinder (507) is filled with hydraulic oil. A sealing hole for the connecting rod (509) to slide is provided at the end of the second oil cylinder (507). A return spring (5010) is provided inside the second oil cylinder (507). The two ends of the return spring (5010) are fixedly connected to the inner wall of the second oil cylinder (507) and the end of the second piston (508), respectively.

10. A method for demolding the internal threads of a plastic nut, using the demolding mechanism for the internal threads of a plastic nut as described in any one of claims 1-5, characterized in that, Includes the following steps: S1. Separate the outer mold (300), start the drive motor (403) to drive the first threaded column (404) to rotate, and drive the rectangular block (402) and the second mold base (301) to move automatically to the right to realize the separation of the mold cover (302); S2, the inner mold (200) shrinks, the hydraulic cylinder (407) is activated to shrink, and the operating lever (206) moves automatically to the left, thereby driving the conical mold core (205) to move automatically to the left, realizing the automatic shrinking of the three first mold segments (202) and the three second mold segments (203); S3. Remove the plastic nut from the inner mold (200).

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