A mold for machining internal threads and core-pulling of plastic parts

Abstract

The application discloses a mold for processing inner thread and core-pulling of plastic parts, which comprises a fixed mold, a movable mold and an oil cylinder motor, and a first motor gear is fixed on the output shaft of the oil cylinder motor; a transmission mechanism is arranged in the movable mold, the transmission mechanism comprises a rotating shaft, a first insert gear and n second insert gears, the first insert gear is fixed on one end of the rotating shaft, and a second motor gear is fixed on the other end of the rotating shaft; a anti-pulling mechanism is further arranged in the movable mold, the anti-pulling mechanism comprises n anti-rotation inserts, one hole-site insert is arranged in each anti-rotation insert, one end of each hole-site insert is fixed on the second insert gear, and the other end of each hole-site insert is fixed with a screw thread insert, the screw thread insert is movably arranged in a cavity through a core and is used for forming an inner thread plastic part, and the rotating shaft is driven to rotate by the driving force provided by the oil cylinder motor so as to drive the screw thread insert to rotate. The mold does not cause pulling and burning, and the generation of burrs is avoided; the tooth head and the tooth tail of the screw thread are in a unified position through the core limiting mechanism.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of plastic mold, in particular to a mold for processing internal thread and core-pulling of plastic parts. BACKGROUND

[0002] Plastic forming is the most common method in plastic processing. As one of the tools for plastic forming, plastic injection mold affects the quality, precision, manufacturing cycle, and production efficiency of the injection process, and thus affects the product quality, yield, and cost. The product update has higher requirements for mold design level. Great progress has been made in precision plastic mold, and the plastic parts produced by the mold are slowly matured.

[0003] There are various types of internal thread demolding in the mold industry, and the main structure basically includes strong demolding structure, motor driven structure, manual thread insert structure, oil cylinder rotating structure, and inclined top structure. Generally, the demolding structure is customized to meet the appearance of the product and the needs of the customer.

[0004] However, the existing internal thread demolding structure has more or less defects, such as the following points: 1. During the process of automatic demolding push plate driven by oil cylinder, due to the large friction, it is easy to be pulled and burned, which causes the mold to produce burrs; 2. Since there is no limit on the circumference of the plastic product on the mold, when the plastic part is separated from the mold, the rotation of the mold will cause the plastic product to rotate, resulting in the demolded product not meeting the standard requirements; 3. The thread insert has no core-limiting structure, and the tooth head and tooth tail of the processed product cannot always be in the same position. SUMMARY

[0005] The present application provides a mold for processing internal thread and core-pulling of plastic parts to overcome the above technical deficiencies.

[0006] The technical solution adopted by the present application to overcome the technical problems is:

[0007] The utility model provides a mould for processing the inner thread and core-pulling of plastic part, including fixed mould, movable mould and oil cylinder motor fixed on movable mould, the one end of fixed mould is equipped with cavity near movable mould, the one end of movable mould is equipped with core near fixed mould and matches with cavity, the fixed mould is equipped with spout hole and runner, spout hole is connected with runner, runner is connected with cavity, the output shaft of oil cylinder motor is fixed with first motor gear, the movable mould is equipped with transmission mechanism, transmission mechanism includes rotating shaft, first insert gear and n second insert gears which are engaged with first insert gear, wherein, n >=1, first insert gear is fixed on one end of rotating shaft, the other end of rotating shaft is fixed with second motor gear, first motor gear and second motor gear are connected through motor chain engagement, the movable mould is equipped with anti-pulling mechanism, anti-pulling mechanism includes n anti-rotation inserts, each anti-rotation insert is equipped with a hole position insert, one end of each hole position insert is fixed on second insert gear, the other end is fixed with screw thread insert for inner thread forming, and the middle of each hole position insert is sleeved with rolling bearing, screw thread insert is movably arranged in cavity through core for inner thread plastic part forming, rotating shaft rotates through the driving force provided by oil cylinder motor to drive screw thread insert to rotate.

[0008] Further, the top end face of each anti-rotation insert is provided with at least one limiting block, preferably, the top end face of each anti-rotation insert is circumferentially uniformly provided with a plurality of limiting blocks.

[0009] Further, the fixed mould includes a fixed mould fixing plate, a water gap plate and an A plate, the spout hole is fixed on the fixed mould fixing plate, and the cavity is detachably fixed on one end of the A plate away from the water gap plate; the movable mould includes a push plate, a B plate fixing plate, a pad plate, a sink plate, a square iron and a movable mould fixing plate, the sink plate and the movable mould fixing plate are fixed with a thimble push plate and a thimble push plate fixing plate, the core is detachably fixed on one end of the push plate away from the B plate fixing plate, the push plate is movably fixed on the A plate, a plurality of pull rods penetrating through the push plate and the B plate fixing plate are fixed on one end of the pad plate close to the B plate fixing plate, at least two limiting pull rods penetrating through the pad plate are fixed on one end of the sink plate close to the pad plate, a spring is sleeved on each limiting pull rod, a plurality of reset rods penetrating through the sink plate, the pad plate and the B plate fixing plate in turn are fixed on one end of the thimble push plate fixing plate close to the sink plate, the top end of each reset rod is fixed with an A type small pull rod matched with the reset rod, and the A type small pull rod is fixed in the push plate.

[0010] Further, the movable mold is internally provided with a core-entering limiting mechanism, the core-entering limiting mechanism comprises a locking piece movably nested in the sink plate and a locking groove opened on the rotating shaft, the locking groove comprises a right angle surface perpendicular to the circumferential surface of the rotating shaft and an inclined surface inclined to the circumferential surface of the rotating shaft, one end of the locking piece is provided with a stepped surface matched with the locking groove, the stepped surface comprises a first stepped surface and a second stepped surface, a locking surface is arranged between the first stepped surface and the second stepped surface, the other end of the locking piece is provided with a circular groove in which a spring three is nested, the axis of the circular groove and the spring three is perpendicular to the axis of the rotating shaft, the middle part of the locking piece is provided with an oblong hole parallel to the axis of the rotating shaft and penetrating through the locking piece, a limiting bolt is arranged in the oblong hole and the top end of the limiting bolt is fixed on the sink plate.

[0011] Further, the anti-rotation insert is fixed on the B plate fixing plate, the first insert gear is arranged between the cushion plate and the sink plate through a large bearing, and each second insert gear is arranged between the cushion plate and the sink plate through a small bearing and a flat plate bearing.

[0012] Further, the water gap plate is fixed between the fixed mold fixing plate and the A plate through a plurality of pull rods one and a plurality of pull rods two, and the push plate and the A plate are movably fixed together through a plurality of nylon rods.

[0013] Further, the A plate is provided with a plurality of first cold water pipelines communicated with the cavity, and the push plate is provided with a plurality of second cold water pipelines communicated with the core.

[0014] Further, the oil cylinder motor is fixed on one side of the cushion plate through an oil cylinder motor support, a chain passage is opened on one side of the sink plate close to the oil cylinder motor, and the first motor gear is connected with the second motor gear in meshing through a motor chain passing through the chain passage.

[0015] Further, the fixed mold is further provided with n core pulling mechanisms, each core pulling mechanism comprises an inclined guide column, a shovel base, a sliding block, an insert needle, two pressing strips arranged at two ends of the sliding block and two springs two horizontally nested in the sliding block, wherein the inclined guide column and the shovel base are arranged in the water gap plate, the sliding block and the two pressing strips are arranged in the A plate, the inclined guide column is fixed above the sliding block, the insert needle is fixed below the sliding block and the insert needle is movably arranged in the cavity.

[0016] Further, the movable mold is internally provided with a plurality of guide columns, and the fixed mold is provided with a plurality of guide sleeves in sliding cooperation with the guide columns.

[0017] The beneficial effects of the present application are:

[0018] 1. Through the fixed installation of the core-pulling mechanism on the fixed mold, the gear meshing of the motor and the pushing out of the push plate, the pin with the core can be pulled out in the process of mold opening; meanwhile, the product with threads is rotated out by the motor oil cylinder and pushed out by the push plate, which will not cause pulling and burning, avoids the generation of burrs of the mold, reduces the demolding time and improves the demolding efficiency, thereby improving the production efficiency, and the structure design is reasonable and has high practicability.

[0019] 2. By arranging the limiting block on the top end face of the anti-rotation insert, the plastic part is clamped on the anti-rotation insert of the mold, the circumferential limiting is realized, when the plastic part is separated from the mold, the rotation of the mold will not drive the rotation of the plastic product, and the qualified rate of the product is greatly improved.

[0020] 3. By arranging the core-entering limiting mechanism in the movable mold, the threaded insert is reversely positioned, so that the tooth head and tooth tail of the processed product are ensured to be at a unified position, and the product reaches a unified standard.

[0021] 4. By arranging the core-pulling mechanism on the fixed mold, and arranging the inclined guide pillar and the shovel base on the nozzle plate, arranging the sliding block and the pressing strip on the A plate, the sliding block and the inclined guide pillar cooperate, and the pressing strip acts, so that the core-pulling action is completed, the shovel base can be better reset when the mold is closed, and the precision of the mold is improved.

[0022] 5. By detachably arranging the cavity on the fixed mold and detachably arranging the core on the movable mold, the cavity and the core can be easily disassembled and maintained, and can be replaced, so that different products can be produced, and the cost is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is the overall structure schematic diagram of the product processed by the present application.

[0024] Figure 2 It is the cross-sectional structure schematic diagram of the product processed by the present application.

[0025] Figure 3 It is the overall structure schematic diagram of the mold for processing the internal thread and core of the plastic part according to the embodiment of the present application.

[0026] Figure 4 It is the exploded structure schematic diagram of the mold for processing the internal thread and core of the plastic part according to the embodiment of the present application.

[0027] Figure 5 It is Figure 4 the enlarged schematic diagram of the A part.

[0028] Figure 6 It is Figure 4 the enlarged schematic diagram of the B part.

[0029] Figure 7 is Figure 4 is an enlarged schematic view of part C in figure 6.

[0030] Figure 8 is a schematic view of the structure of the locking member and the shaft stopper according to the embodiment of the present application.

[0031] Figure 9 is a schematic view of the structure of the locking groove on the shaft according to the embodiment of the present application.

[0032] Figure 10 is a schematic view of the structure of the locking member from the bottom according to the embodiment of the present application.

[0033] Figure 11 is a schematic view of the structure of the locking member without spring three and the limiting bolt according to the embodiment of the present application.

[0034] Figure 12 is a bottom view of the lower surface of the sink plate according to the embodiment of the present application. Figure I

[0035] Figure 13 is a bottom view of the lower surface of the sink plate according to the embodiment of the present application. Figure II

[0036] In the figure, 1 is a fixed die plate; 2 is a nozzle plate; 3 is an A plate; 4 is a cavity; 5 is a core; 6 is a guide sleeve; 7 is a push plate; 8 is a B plate fixed plate; 9 is a pad; 10 is a sink plate; 101 is a locking member limiting groove; 11 is a square iron; 12 is a ejector pin push plate; 13 is a ejector pin push plate fixed plate; 14 is a movable die plate; 15 is a runner; 16 is a nipple hole; 17 is a pull rod one; 18 is a pull rod two; 19 is an inclined guide column; 20 is a spade base; 21 is a sliding block; 22 is an insert pin; 23 is a pressing strip; 24 is a spring two; 25 is a first cold water pipeline; 26 is a nylon rod; 27 is an A type small pull rod; 28 is a second cold water pipeline; 29 is a screw tooth insert; 30 is an anti-rotation insert; 301 is a limiting block; 31 is a rolling bearing; 32 is a spring one; 33 is a pull rod three; 34 is an insert fixed plate; 35 is a hole site insert; 36 is a limiting pull rod; 37 is a small bearing; 38 is a large bearing; 39 is a first insert gear; 40 is a second insert gear; 41 is a shaft; 411 is a locking groove; 4111 is a right angle surface; 4112 is an inclined surface; 42 is a reset rod; 43 is an oil cylinder motor; 44 is an oil cylinder support; 45 is a first motor gear; 46 is a motor chain; 47 is a locking member; 471 is a first step surface; 472 is a second step surface; 473 is a locking surface; 474 is a circular groove; 475 is a spring three; 476 is an oblong hole; 477 is a limiting bolt; 48 is a second motor gear; 49 is a flat plate bearing; and 50 is a chain passage. DETAILED DESCRIPTION

[0037] ​​To facilitate a better understanding of the present invention by those skilled in the art, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The following are merely exemplary and do not limit the scope of protection of the present invention.

[0038] like Figures 3-7 As shown in this embodiment, a mold for processing internal threads and core pulling of plastic parts includes a fixed mold and a moving mold, both of which are rectangular parallelepiped in shape. A hydraulic cylinder motor 43 is fixed on the moving mold, and a first motor gear 45 is fixed on the output shaft of the hydraulic cylinder motor 43. A cavity 4 is provided on the fixed mold near the moving mold, and a core 5 matching the cavity is provided on the moving mold near the fixed mold. The fixed mold is provided with a nozzle hole 16 and a runner 15. Specifically, the fixed mold includes a fixed mold fixing plate 1, a sprue plate 2, and an A plate 3 from top to bottom. The moving mold includes a push plate 7, a B plate fixing plate 8, a pad plate 9, a countersunk plate 10, a square iron 11, and a moving mold fixing plate 14 from top to bottom. An ejector plate 12 and an ejector plate fixing plate 13 are fixed between the countersunk plate 10 and the moving mold fixing plate 14 from top to bottom. The pad plate 9, the countersunk plate 10, and the square iron 11 are connected by detachable bolts. The nozzle hole 16 is fixed on the fixed mold plate 1. The nozzle hole 16 is connected to the runner 15. Specifically, the nozzle hole 16 passes through the sprue plate 2 to reach the runner 15, and the runner 15 is connected to the cavity 4. The cavity 4 is detachably fixed on the A plate 3 at the end away from the sprue plate 2. The core 5 is detachably fixed on the push plate 7 at the end away from the B plate fixed plate 8 and is located on the same plane as the upper surface of the push plate 7. The cavity 4 is installed on the A plate 3 by detachable bolts, and the core 5 is installed on the push plate 7 by detachable bolts, which facilitates the disassembly and maintenance of the cavity 4 and the core 5, and facilitates the installation and disassembly of the mold. The push plate 7 is movably fixed on the A plate 3. Four pull rods 33 that penetrate the push plate 7 and the B plate fixing plate 8 are fixed on the end of the pad 9 near the B plate fixing plate 8. Two limiting pull rods 36 that penetrate the pad are fixed on the end of the sinker plate 10 near the pad 9. A spring 32 is sleeved on each limiting pull rod 36. Several reset rods 42 that penetrate the sinker plate 10, the pad 9 and the B plate fixing plate 8 are fixed on the end of the push plate fixing plate 13 near the sinker plate 10. A small A-type pull rod 27 that matches the reset rod is fixed at the top of each reset rod 42. The small A-type pull rod 27 is fixed in the push plate 7.

[0039] Furthermore, the A plate 3 is provided with a plurality of circular first cold water pipes 25 communicating with the cavity 4, and the push plate 7 is provided with a plurality of circular second cold water pipes 28 communicating with the core 5. The first cold water pipes 25 and the second cold water pipes 28 are used to accelerate the cooling speed of the plastic mold and accelerate the molding speed of the plastic mold, thereby improving the production efficiency of plastic products.

[0040] Further, the water gap plate 2 is fixed between the fixed mold fixed plate 1 and the A plate 3 by four pull rods one 17 and four pull rods two 18, and the push plate 7 is movably fixed with the A plate 3 by four nylon rods 26, wherein the nylon rod 26 is used to temporarily fix the A plate 3 and the push plate 7 together during the process that the injection molding machine separates the fixed mold and the movable mold after the hot plastic is injected into the flow channel 15 through the nipple hole 16 and reaches the specified cooling time.

[0041] In the embodiment, the movable mold is provided with a transmission mechanism, which comprises a rotating shaft 41, a first insert gear 39, and n second insert gears 40 meshing with the first insert gear, wherein n≥1, and in the preferred embodiment, n=2, i.e. there are two second insert gears 40. Specifically, the first insert gear 39 is fixed at one end of the rotating shaft 41, and a second motor gear 48 is fixed at the other end of the rotating shaft 41, and the first motor gear 45 is connected with the second motor gear 48 through a motor chain 46.

[0042] Further, the oil cylinder motor 43 is fixed on one side of the base plate 9 through an oil cylinder motor support 44, a chain passage 50 is formed on one side of the sink plate 10 close to the oil cylinder motor 43, and the first motor gear 45 is connected with the second motor gear 48 through the motor chain 46 passing through the chain passage 50.

[0043] Further, the anti-rotation insert 30 is fixed on the B plate fixed plate 8, and the B plate fixed plate 8 is provided with an insert fixed plate 34 for fixing the anti-rotation insert 30; the first insert gear 39 is arranged between the base plate 9 and the sink plate 10 through a large bearing 38; and each second insert gear 40 is arranged between the base plate 9 and the sink plate 10 through a small bearing 37 and a flat plate bearing 49.

[0044] As a preferred scheme of the embodiment, the movable mold is further provided with an anti-pulling mechanism, which comprises two anti-rotation inserts 30, each of which is provided with a hole site insert 35, the lower end of each hole site insert 35 is fixed on the second insert gear 40, the upper end is fixed with a screw thread insert 29 for internal thread forming, and a rolling bearing 31 is sleeved in the middle of each hole site insert 35. The screw thread insert 29 is movably arranged in the cavity 4 through the core 5 for internal thread molding, and the rotating shaft 41 is driven to rotate by the oil cylinder motor 43 to drive the screw thread insert 29 to rotate. The anti-pulling mechanism has the effect that, due to the arrangement of the rolling bearing 31, the automatic demolding push plate is not pulled and burned during the process of being driven by the oil cylinder, the generation of burrs in the mold is avoided, the demolding time is reduced, and the demolding efficiency is improved.

[0045] As a preferred scheme of the embodiment, at least one limiting block 301 is arranged on the top end face of the tapered cylinder of each anti-rotation insert 30, such asFigure 6 As shown, the conical barrel top end face of each anti-rotation insert 30 is circumferentially and uniformly provided with a plurality of limiting blocks 301. In the processing of the inner thread plastic part, the plastic part is clamped on the anti-rotation insert of the mold to achieve circumferential limiting through the limiting blocks 301, wherein the plastic part is also correspondingly provided with a limiting groove (not identified in the figure) matched with the limiting blocks 301, and when the plastic part is separated from the mold, the rotation of the mold will not drive the rotation of the plastic product, greatly improving the qualified rate of the product.

[0046] As a preferred solution of the present embodiment, as Figures 8-13As shown, the movable die is further provided with a core entering limiting mechanism, which comprises a locking piece 47 movably sleeved in the sink plate 10 and a locking groove 411 formed on the rotating shaft 41. Specifically, one side of the sink plate 10 facing the chain channel 50 is provided with a locking piece limiting groove 101, and the locking piece 47 is sleeved in and movable in the locking piece limiting groove 101. The locking groove 411 comprises a right-angled surface 4111 perpendicular to the circumferential surface of the rotating shaft 41 and an inclined surface 4112 inclined to the circumferential surface of the rotating shaft 41. One end of the locking piece 47 is provided with a stepped surface matched with the locking groove 411, which comprises a first stepped surface 471 and a second stepped surface 472, and a locking surface 473 is arranged between the first stepped surface 471 and the second stepped surface 472. During the clamping process, when the rotating shaft 41 is rotated clockwise to the position of the locking piece 47, the right-angled surface 4111 of the locking groove is in close contact with the locking surface 473 of the locking piece, so that the locking piece 47 clamps the rotating shaft 41, thereby limiting the rotating shaft 41. This can ensure that the rotating shaft 41 is clamped at the same position during each clamping process, thereby ensuring that the tooth head and tooth tail of the screw thread of the processed product are at a unified position. In the embodiment, the second stepped surface 472 is outwardly inclined from one end close to the locking surface 473 to the other end away from the locking surface 473. When the rotating shaft 41 is rotated clockwise, the outwardly inclined second stepped surface 472 facilitates the close contact between the right-angled surface 4111 of the locking groove and the locking surface 473 of the locking piece. In the embodiment, the first stepped surface 471 is outwardly inclined from one end close to the locking surface 473 to the other end away from the locking surface 473. When the rotating shaft 41 is rotated counterclockwise, the outwardly inclined first stepped surface 471 facilitates the sliding of the locking piece 47 out of the locking groove 411. The other end of the locking piece 47 is provided with a circular groove 474 in which a spring 475 is sleeved, and the axes of the circular groove 474 and the spring 475 are perpendicular to the axis of the rotating shaft 41. The middle part of the locking piece 47 is provided with an oblong hole 476 parallel to the axis of the rotating shaft 41 and penetrating through the upper and lower end faces of the locking piece, and a limiting bolt 477 is arranged in the oblong hole 476 and the top end of the limiting bolt is fixed on the sink plate 10. Specifically, the oblong hole 476 comprises an upper half and a lower half, and the hole diameter of the upper half is smaller than that of the lower half. The head of the limiting bolt 477 is arranged in the lower half of the oblong hole 476, and the rod part of the limiting bolt 477 is arranged in the upper half of the oblong hole 476 and the end of the rod part away from the head is fixed on the sink plate 10. Since the limiting bolt 477 is fixed on the sink plate 10, the locking piece 47 can move in the oblong hole 476 under the elastic force of the spring 475.

[0047] In the embodiment, the fixed mold is further provided with two core pulling mechanisms, each of which comprises an inclined guide pillar 19, a shovel base 20, a sliding block 21, an insert pin 22, two pressing strips 23 arranged at both ends of the sliding block, and two springs 24 horizontally nested in the sliding block. The inclined guide pillar 19 and the shovel base 20 are arranged in the water gap plate 2, the sliding block 21 and the two pressing strips 23 are arranged in the A plate 3, the inclined guide pillar 19 is fixed above the sliding block 21, the insert pin 22 is fixed below the sliding block 21 and the insert pin 22 is movably arranged in the cavity 4.

[0048] Further, the movable mold is provided with a plurality of guide columns sequentially penetrating through the push plate 7, the B plate fixing plate 8, the cushion plate 9, and the sink plate 10, and the fixed mold is provided with a plurality of guide sleeves 6 in sliding fit with the guide columns. When assembling the fixed mold and the movable mold, the guide columns and the guide sleeves can guide the installation of the mold.

[0049] The working principle of the mold for machining the inner thread of a plastic part and core pulling is as follows: when the mold is used for production, first, the cavity 4 is installed on the A plate 3, and the core 5 is installed on the push plate 7, then the fixed mold plate 1, the water plate 2 and the A plate 3 are installed together through the four pull rods 17 and the four pull rods 18, and the movable mold plate 14, the square iron 11 and the sink plate 10 are installed together by using the detachable fastener, this connection method is convenient for disassembling and maintaining the cavity 4 and the core 5, and the cavity 4 and the core 5 can be replaced, so that different products can be produced, so that the mold can be changed without changing the mold frame, and the cost is saved. Then align the fixed mold with the movable mold, after the two are aligned, position them through the guide column and the guide sleeve 6, and move the two towards each other until they are in close contact with each other, after the installation is completed, the cavity 4 and the core 5 are in close contact with each other, the reference table aligns them, the plastic of the injection molding machine is injected into the flow channel 15 of the A plate 3 through the nipple hole 16, and is cooled through the first cold water pipeline 25 and the second cold water pipeline 28, after the cooling is completed, then the injection molding machine separates the fixed mold from the movable mold, during the separation process, the A plate 3 on the fixed mold is driven by the nylon rod 26 on the movable mold, so that the inclined guide column 19 arranged in the water plate 2 drives the slider 21 to slide, so that the plastic part inner pin 22 completes the core pulling action. When the movable mold is driven by the injection molding machine for a certain distance, the pull rod two 18 on the fixed mold is limited in the A plate 3, and the length of the pull rod two 18 controls the separation of the fixed mold and the movable mold. After the fixed mold and the movable mold are separated, the oil cylinder motor 43 on the movable mold starts to work, the oil cylinder motor 43 rotates the first motor gear 45, and the motor chain 46 drives the second motor gear 48 to rotate, and then the second motor gear 48 drives the rotating shaft 41 to rotate, the first insert gear 39 on the rotating shaft 41 rotates, the second insert gear 40 meshes with the first insert gear 39, and finally drives the screw thread insert 29 to rotate. The limiting pull rod 36 on the sink plate 10 penetrates the pad 9 and is provided with a spring one 32 on the pad 9, the spring one 32 assists the plastic part to fall off while the screw thread insert 29 rotates, specifically, the spring one 32 and the screw thread insert 29 work at the same time, the B plate fixing plate 8 is opened by a small distance, and finally the A type small pull rod 27 connected to the reset rod 42 drives the push plate 7 to separate the plastic part from the core 5, so that the plastic part is separated from the core 5, and the product is taken out, as shown in Figure 1 and 2 The overall structure and the cross-sectional structure of the product are shown in the schematic diagram and the schematic diagram, respectively.

[0050] We know the mold opening process above, then the mold closing process is as follows: when the mold is closed, the oil cylinder motor 43 drives the screw thread insert 29 to reverse to the initial position of the screw thread; the core pulling mechanism moves the slider 22 back through the shovel base 20 and the pressing strip 23, and drives the insert pin 22 to insert into the cavity 4; after the cavity 4 and the core 5 are completely in close contact, the insert pin 22 will return to the original position, and the mold completes the closing action.

[0051] The working principle of the core-entering limiting mechanism is as follows: during the clamping process, since the limiting bolt 477 is fixed on the sink plate 10, the far end of the spring three 475 away from the rotating shaft 41 is abutted against the edge of the locking member limiting groove 101 under the elastic force of the spring three 475, as shown in the figure, at this time, the limiting bolt 477 is located in the long-circular hole 476 away from the far end of the rotating shaft 41, that is, the stroke of the locking member 47 reaches the leftmost end, when the rotating shaft 41 is rotated clockwise to the position of the locking member 47, the end of the locking member 47 provided with the stepped surface clamps the rotating shaft 41, specifically, the locking surface 473 of the locking member is attached to the right-angle surface 4111 of the locking groove of the rotating shaft, thereby limiting the rotating shaft 41, which can guarantee that the rotating shaft 41 is clamped at the same position each time the mold is clamped, thereby guaranteeing that the thread head and tail of the product processed are at a unified position. Figure 12 During the mold opening process, the rotating shaft 41 is counterclockwise rotated, when the rotating shaft 41 is counterclockwise rotated, since the surface opposite to the right-angle surface 4111 is the inclined surface 4112, under the rotating force of the rotating shaft, the end of the locking member 47 provided with the stepped surface slides out of the locking groove 411 along the inclined surface 4112, the locking member 47 moves right relative to the limiting bolt 477, the spring three 475 is compressed, until the stroke of the locking member 47 reaches the rightmost end, as shown in the figure, at this time, the spring three 475 is completely compressed into the circular groove 474, the end of the locking member 47 away from the rotating shaft 41 is abutted against the edge of the locking member limiting groove 101, that is, the rotating shaft 41 can be counterclockwise rotated without obstruction. Figure 13

[0052] The above only describes the basic principle and preferred embodiment of the present application, and those skilled in the art can make many changes and improvements according to the above description, and these changes and improvements should belong to the protection scope of the present application.​

Claims

1. A mold for machining the internal thread of a plastic part and core-pulling, comprising a fixed mold, a movable mold and a cylinder motor (43) fixed to the movable mold, wherein a cavity (4) is arranged on the fixed mold near one end of the movable mold, a core (5) matched with the cavity is arranged on the movable mold near one end of the fixed mold, a nozzle hole (16) and a runner (15) are arranged on the fixed mold, the nozzle hole (16) is communicated with the runner (15), the runner (15) is communicated with the cavity (4), and a first motor gear (45) is fixed to the output shaft of the cylinder motor (43); the movable mold comprises a push plate (7), a B plate fixing plate (8), a gasket plate (9), a sink plate (10), a square iron (11) and a movable mold fixing plate (14); a transmission mechanism is arranged in the movable mold, the transmission mechanism comprises a rotating shaft (41), a first insert gear (39) and n second insert gears (40) engaged with the first insert gear, wherein, n≥1, the first insert gear (39) is fixed at one end of a rotating shaft (41), the other end of the rotating shaft (41) is fixed with a second motor gear (48), the first motor gear (45) and the second motor gear (48) are connected through a motor chain (46); the movable mold is further provided with an anti-pulling mechanism, the anti-pulling mechanism comprises n anti-rotation inserts (30), each anti-rotation insert (30) is provided with a hole insert (35), one end of each hole insert (35) is fixed on the second insert gear (40), the other end is fixed with a screw tooth insert (29) for internal thread forming, and a rolling bearing (31) is sleeved in the middle of each hole insert (35), the screw tooth insert (29) is movably arranged in the cavity (4) through the core (5), the rotating shaft (41) is driven to rotate by the driving force of the oil cylinder motor (43) to drive the screw tooth insert (29) to rotate; Characterized in that the movable mold is further provided with a core entering limiting mechanism, the core entering limiting mechanism comprises a locking piece (47) movably nested in the sink plate (10) and a locking groove (411) opened on the rotating shaft (41), the locking groove (411) comprises a right angle surface (4111) perpendicular to the circumference of the rotating shaft (41) and an inclined surface (4112) inclined to the circumference of the rotating shaft (41), one end of the locking piece (47) is provided with a stepped surface matched with the locking groove (411), the stepped surface comprises a first stepped surface (471) and a second stepped surface (472), a locking surface (473) is arranged between the first stepped surface (471) and the second stepped surface (472); during the clamping process, when the rotating shaft (41) rotates clockwise to the position of the locking piece (47), the right angle surface (4111) of the locking groove is matched with the locking surface (473) of the locking piece (47) to make the locking piece (47) clamp the rotating shaft (41), thereby limiting the rotating shaft (41); The second stepped surface (472) is outwardly inclined from one end close to the locking surface (473) to the other end away from the locking surface (473), when the rotating shaft (41) rotates clockwise, the outwardly inclined second stepped surface (472) facilitates the matching of the right angle surface (4111) of the locking groove with the locking surface (473) of the locking piece; The first stepped surface (471) is outwardly inclined from one end close to the locking surface (473) to the other end away from the locking surface (473), when the rotating shaft (41) rotates counterclockwise, the outwardly inclined first stepped surface (471) facilitates the locking piece (47) to slide out of the locking groove (411).

2. The mold for machining the internal thread of a plastic part and core-drawing according to claim 1, characterized in that, The conical cylinder top end face of each anti-rotation insert (30) is provided with at least one limiting block (301).

3. The mold for machining the internal thread of a plastic part and core-drawing according to claim 1, characterized in that, The fixed mold comprises a fixed mold fixed plate (1), a nozzle plate (2) and an A plate (3), a spout hole (16) is fixed on the fixed mold fixed plate (1), and a cavity (4) is detachably fixed on one side of the A plate (3) away from the nozzle plate (2); a plunger push plate (12) and a plunger push plate fixed plate (13) are fixed between the sink plate (10) and the movable mold fixed plate (14), a core (5) is detachably fixed on one side of the push plate (7) away from the B plate fixed plate (8), the push plate (7) is movably fixed on the A plate (3), and a plurality of pull rods three (33) penetrating through the push plate (7) and the B plate fixed plate (8) are fixed on one side of the backing plate (9) close to the B plate fixed plate (8); at least two limiting pull rods (36) penetrating through the backing plate are fixed on one side of the sink plate (10) close to the backing plate (9), a spring one (32) is sleeved on each limiting pull rod (36), a plurality of reset rods (42) penetrating through the sink plate (10), the backing plate (9) and the B plate fixed plate (8) in sequence are fixed on one side of the plunger push plate fixed plate (13) close to the sink plate (10), and the top end of each reset rod (42) is fixed with an A-shaped small pull rod (27) matched with the reset rod.

4. The mold for machining the internal thread of a plastic part and core pulling according to claim 3, characterized in that, The other end of the locking piece (47) is provided with a circular groove (474) in which a spring three (475) is nested, the axes of the circular groove (474) and the spring three (475) are perpendicular to the axis of the rotating shaft (41), the middle part of the locking piece (47) is provided with an oblong hole (476) parallel to the axis of the rotating shaft (41) and penetrating through the locking piece, and a limiting bolt (477) is arranged in the oblong hole (476) and the top end of the limiting bolt is fixed on the sink plate (10).

5. The mold for machining the internal thread of a plastic part and core-drawing according to claim 3, characterized in that, The anti-rotation insert (30) is fixed on the B plate fixed plate (8), the first insert gear (39) is arranged between the backing plate (9) and the sink plate (10) through a large bearing (38), and each second insert gear (40) is arranged between the backing plate (9) and the sink plate (10) through a small bearing (37) and a flat plate bearing (49).

6. The mold for machining the internal thread of a plastic part and core-drawing according to claim 3, characterized in that, The nozzle plate (2) is fixed between the fixed mold fixed plate (1) and the A plate (3) through a plurality of pull rods one (17) and a plurality of pull rods two (18), and the push plate (7) and the A plate (3) are movably fixed together through a plurality of nylon rods (26).

7. The mold for machining the internal thread of a plastic part and core-drawing according to claim 3, characterized in that, A plurality of first cold water pipes (25) in communication with the cavity (4) are arranged on the A plate (3), and a plurality of second cold water pipes (28) in communication with the core (5) are arranged on the push plate (7).

8. The mold for machining the internal thread of a plastic part and core-drawing according to claim 3, characterized in that, The oil cylinder motor (43) is fixed on one side of the backing plate (9) through an oil cylinder motor support (44), a chain passage (50) is formed in one side of the sink plate (10) close to the oil cylinder motor (43), and the first motor gear (45) is connected with the second motor gear (48) in meshing connection through a motor chain (46) penetrating through the chain passage (50).

9. A mold for machining internal threads and core-pulling of plastic parts according to any one of claims 3-8, characterized in that, The core-pulling mechanism includes an inclined guide pillar (19), a shovel base (20), a sliding block (21), an insert pin (22), two pressing strips (23) arranged at two ends of the sliding block, and two springs (24) horizontally nested in the sliding block, wherein the inclined guide pillar (19) and the shovel base (20) are arranged in the water gap plate (2), the sliding block (21) and the two pressing strips (23) are arranged in the A plate (3), the inclined guide pillar (19) is fixed above the sliding block (21), the insert pin (22) is fixed below the sliding block (21), and the insert pin (22) is movably arranged in the mold cavity (4).

10. The mold for machining the internal thread of a plastic part and core-drawing according to claim 9, characterized in that, A plurality of guide columns are arranged in the movable mold, and a plurality of guide sleeves (6) that are in sliding cooperation with the guide columns are arranged on the fixed mold.

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