A plastic pencil shaft molding device

Abstract

The application discloses a plastic pencil shaft plastic forming device, which comprises a base, a fixed plate arranged on the upper portion of the base, a supporting shaft rotatably arranged on the front side of the fixed plate, a mounting disc arranged on the outer side of the front end of the supporting shaft, a pencil shaft plastic forming cylinder arranged on one side of each of four connecting plates, a positioning assembly arranged in the pencil shaft plastic forming cylinder and used for positioning a pencil core, a sliding cover assembly arranged at the outlet end of the pencil shaft plastic forming cylinder, a blanking assembly arranged at the upper end of the fixed plate and used for mounting the pencil core on the pencil shaft plastic forming cylinder, a guide plate arranged at the fixed plate opposite to an injection molding station, a feeding pipe slidably arranged in the guide plate and communicated with an injection molding machine, a guide pressing plate arranged at the discharge end of the feeding pipe, a coaming fixedly arranged on the front portion of the upper surface of the base, and a top opening plate arranged on the inner side of the coaming and used for opening the sliding cover assembly. The application can avoid the expansion of the pencil shaft due to the Bausch effect, and ensure that the size of the pencil shaft after cooling forming is the same as the predetermined forming size.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of pencil production equipment, in particular to a plastic pencil shaft forming device. BACKGROUND

[0002] Pencils have a long history and are widely used. According to historical records, the history of making pencils from solid wood has been more than 300 years. With the continuous development of science and technology, in recent years, in order to save wood and meet the requirements of environmental protection, the wooden pencil shaft of the traditional pencil is replaced by a plastic pencil shaft. The existing plastic pencil production process is that a plastic extruder extrudes and granulates three kinds of raw materials, i.e. a lead core, a pencil shaft and a skin. The lead core, the pencil shaft and the skin granular raw materials are respectively added into corresponding extruder hoppers, the lead core extruder is started to extrude the lead core, the lead core is quickly introduced into a co-extrusion forming die, then the pencil shaft extruder is started, the pencil shaft automatically wraps the lead core to lead it out of the die, and the skin extruder is started to color; the finished pencil is introduced into a cooling tank, the cooled pencil is led out by a traction machine, and then cut into semi-finished pencils by a cutting machine according to the specified length, and finally collected.

[0003] Patent authorization announcement No. CN214239444U discloses a pencil forming die, which comprises a lead core cone sleeve provided with two-section conical material distribution and flow stabilization sections, and an inlet sleeve plate, a pencil shaft cone sleeve, a pencil skin cone sleeve and an outlet sleeve plate connected in sequence. One end of the lead core cone sleeve extends into an outlet cavity of the outlet sleeve plate from the inside of the pencil shaft cone sleeve and the pencil skin cone sleeve in sequence. The die can make the pencil shaft material entering the die from one side uniformly distributed in the pencil shaft material flow channel, effectively avoiding the problems of pencil eccentricity and incomplete pencil shaft extrusion caused by large side pressure of the pencil shaft material, and effectively avoiding the extrusion pressure of the pencil shaft material on the lead core during the co-extrusion forming of the pencil, effectively solving the problem of easy breakage of the lead core. However, there are still some deficiencies, such as the plastic pencil is discharged from the forming die without being completely cooled and shaped, and the pencil shaft part is mainly made of plastic material, which is prone to expansion under the influence of the Bárány effect (extrusion expansion effect), so that the size of the pencil shaft after cooling and forming cannot reach the predetermined forming size. SUMMARY

[0004] The purpose of the present application is to provide a plastic pencil shaft forming device to solve the problems in the background art.

[0005] In order to achieve the above object, the present application provides the following technical scheme: a plastic pencil shaft molding device, comprising a base, a fixed plate is arranged on the upper part of the base, a support shaft is rotatably arranged on the front side of the fixed plate, an installation disc is arranged on the outer side of the front end of the support shaft, a feeding station, an injection molding station, a cooling station and a discharging station are uniformly arranged on the side of the installation disc away from the fixed plate along the rotation direction, a connecting plate is arranged at each of the four stations, a pencil shaft molding cylinder is mounted on one side of each of the four connecting plates, a positioning assembly for positioning the pencil core is arranged in the pencil shaft molding cylinder, a sliding cover assembly is arranged at the outlet end of the pencil shaft molding cylinder, a blanking assembly for mounting the pencil core to the pencil shaft molding cylinder is arranged on the upper end of the fixed plate, a guide plate is arranged on the fixed plate opposite to the injection molding station, a material conveying pipe in communication with the injection molding machine is slidably arranged in the guide plate, a first tension spring is arranged on the outer side of the material outlet end of the material conveying pipe, a guide pressing plate is arranged at the material outlet end of the material conveying pipe, a coaming is fixedly arranged on the front part of the upper surface of the base, cooling liquid is injected into the cavity formed by the coaming and the fixed plate, a top opening plate for opening the sliding cover assembly is arranged on the inner side of the coaming, a radiator for radiating the cooling liquid is arranged on the outer side of the coaming, and a driving motor is arranged on the rear side of the fixed plate for driving the support shaft to rotate.

[0006] Preferably, the positioning assembly comprises a bracket, a jacking rod, a return spring, a limiting frame, a positioning clamp block, a positioning sleeve plate and a rubber damping ring, a stepped through hole is formed on the side of the connecting plate away from the pencil shaft molding cylinder, a bracket is arranged in the stepped through hole, a jacking rod is arranged on one side of the bracket and inserted into the pencil shaft molding cylinder, the diameter of the jacking rod is smaller than that of the pencil core, a return spring is arranged on the outer side of the jacking rod, a limiting frame matched with the jacking rod is arranged on one side of the return spring, a positioning clamp block for positioning the pencil core is uniformly arranged on the side of the limiting frame away from the return spring, a positioning sleeve plate matched with the pencil core is slidably arranged on the inner side of the outlet end of the pencil shaft molding cylinder, and a rubber damping ring is arranged on the outer side of the positioning sleeve plate.

[0007] Preferably, a connecting pipe is arranged between the stepped through holes of the opposite two connecting plates.

[0008] Preferably, the sliding cover assembly comprises an ear plate, a guide rod, an ejection spring, a sliding cover, a positioning plug, a guide sleeve, an L-shaped connecting rod, a spring and a pressing column, the front and back sides of the outlet end of the pen barrel molding cylinder are provided with the ear plates, the two ear plates are uniformly and symmetrically provided with the guide rods on one side, sliding covers are arranged between the adjacent two guide rods, the outer side of the guide rod is provided with the ejection spring for driving the sliding cover to reset, the front and back sides of the pen barrel molding cylinder are provided with the guide sleeves, the guide sleeves are slidably provided with the L-shaped connecting rod, one end of the L-shaped connecting rod is inserted into the connecting plate, the connecting plate is provided with the spring for driving the L-shaped connecting rod to reset, one end of the L-shaped connecting rod inserted into the connecting plate is provided with the pressing column opposite to the limiting frame, one end of the pressing column penetrates through the connecting plate and is inserted into the pen barrel molding cylinder, the other end of the L-shaped connecting rod is connected with the L-shaped positioning plug, and one side of the sliding cover is provided with the positioning slot matched with the positioning plug.

[0009] Preferably, the blanking assembly comprises a storage box, a pressing plate, a push-pull rod, a second tension spring, a guide pipe, a baffle, an operating rod and a driving sleeve, the upper end of the fixed plate is provided with the triangular-shaped storage box, and the lower surface of the storage box is inclined to the blanking through hole, the rear side of the storage box is provided with the push-pull rod, one end of the push-pull rod is provided with the second tension spring outside the storage box, the push-pull rod is connected with the pressing plate through the second tension spring, and the two ends of the pressing plate penetrate through the storage box, the blanking through hole of the storage box is provided with the guide pipe, the rear side of the guide pipe is inserted with the baffle for blocking the pencil core, the rear end of the baffle is connected with the operating rod, and the rear end of the supporting shaft is provided with the driving sleeve outside the supporting shaft for driving the operating rod to pull out.

[0010] Compared with the prior art, the plastic pencil barrel molding device has the following beneficial effects: the pencil core after molding is used as the pencil core for manufacturing the plastic pencil, so that the bending and breaking phenomenon of the pencil core which is not solidified in the manufacturing process of the existing plastic pencil is avoided, and a precise injection mold is not needed, the pencil barrel is molded by using the pencil barrel molding cylinder which rotates circularly, so that the pencil barrel can be cooled and shaped under the limitation of the pencil barrel molding cylinder, the expansion phenomenon of the pencil barrel due to the barus effect is avoided, the size of the pencil barrel after cooling and shaping is ensured to be the same as the predetermined shaping size, and the qualified rate of the plastic pencil production is improved. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 is a front view of the present application;

[0012] Figure 2 is a front view of the present application;

[0013] Figure 3 is Figure 1 is a cross-sectional structure schematic view of A in the middle;

[0014] Figure 4 For Figure 3 Part B of the enlarged structure diagram;

[0015] Figure 5 For Figure 3 Part C of the enlarged structure diagram;

[0016] Figure 6 Part view of the limiting frame in the application;

[0017] Figure 7 Stereoscopic view of the driving sleeve in the application.

[0018] In the figure: 1, base; 2, fixed plate; 3, support shaft; 4, mounting disc; 40, feeding station; 41, injection molding station; 42, cooling station; 43, unloading station; 5, connecting plate; 6, pen barrel plastic forming cylinder; 7, positioning assembly; 70, bracket; 71, ejector rod; 72, return spring; 73, limiting frame; 74, positioning clamp block; 75, positioning sleeve plate; 76, rubber damping ring; 8, sliding cover assembly; 80, lug plate; 81, guide rod; 82, ejector spring; 83, sliding cover; 84, positioning plug rod; 85, guide sleeve; 86, L-shaped linkage rod; 87, spring piece; 88, pressing column; 9, blanking assembly; 90, storage box; 91, extrusion plate; 92, push-pull rod; 93, second tension spring; 94, material guide pipe; 95, baffle; 96, operating rod; 97, driving sleeve; 10, guide plate; 11, material conveying pipe; 12, first tension spring; 13, material guide pressing plate; 14, coaming; 15, top opening plate; 16, radiator; 17, driving motor; 18, connecting pipe. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the application will be described clearly and completely below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the application.

[0020] Please refer to Figures 1-6The application provides a plastic pencil shaft molding device, which comprises a base 1, the upper portion of the base 1 is provided with a fixed plate 2, the front side of the fixed plate 2 is rotationally provided with a supporting shaft 3, the front end outer side of the supporting shaft 3 is sleeved with a mounting disc 4, the mounting disc 4 is uniformly provided with a feeding station 40, an injection molding station 41, a cooling station 42 and a discharging station 43 on the side away from the fixed plate 2 along the rotation direction, connecting plates 5 are arranged at the four stations, pencil shaft molding cylinders 6 are mounted on one side of the four connecting plates 5, stepped through holes are formed in the side of the connecting plates 5 away from the pencil shaft molding cylinders 6, supports 70 are arranged in the stepped through holes, top rods 71 are arranged on one side of the supports 70 and inserted into the pencil shaft molding cylinders 6, the diameter of the top rods 71 is smaller than that of the pencil cores, reset springs 72 are sleeved on the outer sides of the top rods 71, limiting frames 73 matched with the top rods 71 are arranged on one side of the reset springs 72, positioning clamping blocks 74 for positioning the pencil cores are uniformly arranged on the side of the limiting frames 73 away from the reset springs 72, positioning sleeve plates 75 matched with the pencil cores are slidably arranged on the inner side of the outlet end of the pencil shaft molding cylinders 6, rubber damping rings 76 are sleeved on the outer sides of the positioning sleeve plates 75, the lower end of the pencil core is fixed by the positioning clamping blocks 74, and the upper end of the pencil core is positioned and fixed by the positioning sleeve plates 75, so that the pencil core is on the center line of the pencil shaft molding cylinder 6, and the pencil core is prevented from deviating in the injection molding process.

[0021] The front and rear sides of the outlet end of the pencil shaft molding cylinder 6 are provided with ear plates 80, the two ear plates 80 are uniformly and symmetrically provided with guide rods 81, sliding covers 83 are arranged between adjacent two guide rods 81, ejection springs 82 for driving the sliding covers 83 to reset are sleeved on the outer sides of the guide rods 81, guide sleeves 85 are arranged on the front and rear sides of the pencil shaft molding cylinder 6, L-shaped connecting rods 86 are slidably arranged in the guide sleeves 85, one end of the L-shaped connecting rods 86 is inserted into the connecting plates 5, elastic sheets 87 for driving the L-shaped connecting rods 86 to reset are arranged in the connecting plates 5, press columns 88 opposite to the limiting frames 73 are arranged on the end of the L-shaped connecting rods 86 inserted into the connecting plates 5, the one end of the press columns 88 penetrates through the connecting plates 5 and is inserted into the pencil shaft molding cylinder 6, L-shaped positioning inserting rods 84 are connected to the other end of the L-shaped connecting rods 86, positioning slots matched with the positioning inserting rods 84 are formed in one side of the sliding covers 83, the L-shaped connecting rods 86 are driven by the elastic force of the elastic sheets 87, the L-shaped connecting rods 86 drive the positioning inserting rods 84 to be inserted into the positioning slots of the sliding covers 83, so that the position of the sliding covers 83 is fixed, so that the pencil shaft molding cylinder 6 always keeps an open state, and the sliding covers 83 can be automatically closed when the positioning inserting rods 84 slide out of the positioning slots of the sliding covers 83 by the ejection springs 82.

[0022] The upper end of the fixed plate 2 is provided with a blanking assembly 9 for installing the pencil core into the pencil shaft molding cylinder 6, the pencil shaft molding cylinder 6 at the feeding station 40 is filled with the pencil core by the blanking assembly 9.

[0023] The fixed plate 2 opposite to the injection molding station 41 is provided with a guide plate 10, a feeding pipe 11 communicated with the injection molding machine is slidably arranged in the guide plate 10, a first tension spring 12 is sleeved outside the discharging end of the feeding pipe 11, the discharging end of the feeding pipe 11 is provided with a guide pressing plate 13, the guide pressing plate 13 can be automatically pressed on the open end of the pen barrel plastic forming cylinder 6 through the first tension spring 12, a coaming 14 is fixedly arranged on the front upper surface of the base 1, the coaming 14 is filled with cooling liquid in the cavity formed by the fixed plate 2, a radiator 16 for radiating the cooling liquid is arranged outside the coaming 14, a driving motor 17 for driving the gap rotary motion of the support shaft 3 is arranged on the rear side of the fixed plate 2, the fluid plastic in the pen barrel plastic forming cylinder 6 is cooled and shaped by the cooling liquid, the cooling liquid is cooled and radiated by the radiator 16, and a top opening plate 15 for opening the sliding cover 83 is arranged inside the coaming 14, the sliding cover 83 is separated and opened by the top opening plate 15.

[0024] In the embodiment, as shown in Figure 1 , a connecting pipe 18 is arranged between the stepped through holes of the two connecting plates 5, so that the gas in the pen barrel plastic forming cylinder 6 in the injection molding state can be introduced into the pen barrel plastic forming cylinder 6 in the discharging station 43, so that the guide sleeve 85 pushes the plastic pencil out of the pen barrel plastic forming cylinder 6.

[0025] In the embodiment, as shown in Figure 3 and Figure 7 , the material falling assembly 9 includes a storage tank 90, a pressing plate 91, a push-pull rod 92, a second tension spring 93, a guide pipe 94, a baffle 95, an operating rod 96 and a driving sleeve 97, the upper end of the fixed plate 2 is provided with a triangular-shaped storage tank 90, the lower surface of the storage tank 90 is inclined to the material falling through hole, the rear side of the storage tank 90 is provided with the push-pull rod 92, one end of the push-pull rod 92 penetrates the second tension spring 93 sleeved outside the storage tank 90, the push-pull rod 92 is connected with the pressing plate 91 penetrating the second tension spring 93, both ends of the pressing plate 91 penetrate the storage tank 90, the guide pipe 94 is arranged at the material falling through hole of the storage tank 90, the rear side of the guide pipe 94 is inserted with the baffle 95 for blocking the pencil lead, the rear end of the baffle 95 is connected with the operating rod 96, the rear outside of the support shaft 3 is sleeved with the driving sleeve 97 for driving the operating rod 96 to pull, the pressing plate 91 is pushed by the elastic force of the second tension spring 93, so that the pencil lead in the storage tank 90 moves to the material falling through hole, at the same time, the baffle 95 is pulled out of the guide pipe 94 by the driving sleeve 97 driving the operating rod 96, so that the pencil lead falls into the pen barrel plastic forming cylinder 6.

[0026] Working principle: when working, the rotation movement of the support shaft 3 is driven by the driving motor 17, so that the support shaft 3 drives the rotation movement of the mounting disc 4, when the pen barrel plastic forming cylinder 6 rotates to the feeding station 40, the support shaft 3 drives the rotation movement of the driving sleeve 97, the driving sleeve 97 drives the operating rod 96 to pull out the baffle 95 from the material guide pipe 94, so that the pencil core falls into the pen barrel plastic forming cylinder 6, the lower end of the pencil core is limited by the limiting frame 73, the lower end of the pencil core is fixed by the positioning clamp block 74, the upper end of the pencil core is positioned and fixed by the positioning sleeve plate 75, so that the pencil core is on the center line of the pen barrel plastic forming cylinder 6, when the driving motor 17 drives the rotation movement of the support shaft 3 again, the pen barrel plastic forming cylinder 6 with the pencil core runs to the injection molding station, the material guide pressing plate 13 is extruded at the outlet end of the pen barrel plastic forming cylinder 6 by the first jacking spring 12, so that the injection molding machine can injection mold the pen barrel plastic forming cylinder 6, the positioning sleeve plate 75 moves along the inner wall of the pen barrel plastic forming cylinder 6 under the push of the fluid plastic, finally the positioning sleeve plate 75 and the positioning clamp block 74 are separated from the pencil core, at the same time the limiting frame 73 pushes the reset spring 72 to deform and shrink, the limiting frame 73 pushes the pressing column 88, the L-shaped connecting rod 86 drives the positioning plug rod 84 to slide out of the positioning slot of the sliding cover 83, the elastic sheet 87 deforms, the two sliding covers 83 slide towards each other by the elastic force of the ejection spring 82, so that the pen barrel plastic forming cylinder 6 is closed, when the driving motor 17 drives the rotation movement of the support shaft 3 again, the pen barrel plastic forming cylinder 6 with the fluid plastic runs to the cooling liquid for cooling and shaping, when the driving motor 17 drives the rotation movement of the support shaft 3 again, the two sliding covers 83 are separated and opened by the top opening plate 15, at the same time the limiting frame 73 is reset by the elastic force of the reset spring 72 which deforms and shrinks, the L-shaped connecting rod 86 is reset by the elastic force of the deformed elastic sheet 87, and then the L-shaped connecting rod 86 drives the positioning plug rod 84 to insert into the positioning slot of the sliding cover 83, at the same time the connecting pipe 18 introduces the gas in the pen barrel plastic forming cylinder 6 in the injection molding state into the pen barrel plastic forming cylinder 6 in the discharging station 43, so that the guide sleeve 85 pushes the plastic pencil out of the pen barrel plastic forming cylinder 6.

[0027] It is apparent for those skilled in the art that the present application is not limited to the details of the above-described exemplary embodiments, but can be implemented in other concrete forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered in all aspects as illustrative and not restrictive, the scope of the present application being defined by the appended claims rather than the above description, and it is intended to embrace all changes and modifications that fall within the meaning and scope of the equivalent elements of the claims. Any reference signs in the claims should not be considered as limiting the claims involved.

[0028] In the description of the application, unless otherwise specified and limited, the meaning of "a plurality of" is two or more; the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the purpose of facilitating the description of the application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application. In addition, the terms "first", "second", "third" and the like are only for the purpose of description and cannot be understood as indicating or implying relative importance.

[0029] In the description of the application, it should be noted that, unless otherwise specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

Claims

1. A plastic pencil shaft molding device comprising a base (1), characterized in that: The upper portion of the base (1) is provided with a fixed plate (2), the front side of the fixed plate (2) is rotatably provided with a support shaft (3), the front end of the support shaft (3) is externally sleeved with a mounting disc (4), the mounting disc (4) is uniformly provided with a feeding station (40), an injection molding station (41), a cooling station (42) and a discharging station (43) on the side away from the fixed plate (2) along the rotating direction, a connecting plate (5) is arranged at each of the four stations, a pen barrel plasticizing cylinder (6) is arranged on one side of each of the four connecting plates (5), a positioning assembly (7) for positioning a pen core is arranged in the pen barrel plasticizing cylinder (6), a sliding cover assembly (8) is arranged at the outlet end of the pen barrel plasticizing cylinder (6), a blanking assembly (9) for mounting a pen core to the pen barrel plasticizing cylinder (6) is arranged at the upper end of the fixed plate (2), a guide plate (10) is arranged on the fixed plate (2) opposite to the injection molding station (41), a feeding pipe (11) in communication with an injection molding machine is slidably arranged in the guide plate (10), a first tension spring (12) is externally sleeved with the outlet end of the feeding pipe (11), a guide pressing plate (13) is arranged at the outlet end of the feeding pipe (11), a coaming (14) is fixedly arranged at the front portion of the upper surface of the base (1), the cavity formed by the coaming (14) and the fixed plate (2) is filled with cooling liquid, a top opening plate (15) for opening the sliding cover assembly (8) is arranged on the inner side of the coaming (14), a radiator (16) for radiating the cooling liquid is arranged on the outer side of the coaming (14), and a driving motor (17) for driving the intermittent rotary motion of the support shaft (3) is arranged on the rear side of the fixed plate (2).

2. A plastic pencil shaft molding device according to claim 1, characterized in that: The positioning assembly (7) comprises a bracket (70), a jacking rod (71), a return spring (72), a limiting frame (73), a positioning clamp block (74), a positioning sleeve plate (75) and a rubber damping ring (76), a stepped through hole is formed in the side of the connecting plate (5) away from the pen barrel plasticizing cylinder (6), the bracket (70) is arranged in the stepped through hole, the jacking rod (71) is arranged on one side of the bracket (70) and inserted into the pen barrel plasticizing cylinder (6), the diameter of the jacking rod (71) is smaller than that of the pen core, the return spring (72) is externally sleeved with the jacking rod (71), the limiting frame (73) matched with the jacking rod (71) is arranged on one side of the return spring (72), the positioning clamp block (74) for positioning the pen core is uniformly arranged on the side of the limiting frame (73) away from the return spring (72), the positioning sleeve plate (75) matched with the pen core is slidably arranged on the inner side of the outlet end of the pen barrel plasticizing cylinder (6), and the rubber damping ring (76) is externally sleeved with the positioning sleeve plate (75).

3. A plastic pencil shaft molding device according to claim 2, wherein: The stepped through holes of the opposite two connecting plates (5) are provided with a connecting pipe (18).

4. The plastic pencil shaft molding device according to claim 2, wherein: The sliding cover assembly (8) comprises an ear plate (80), a guide rod (81), an ejection spring (82), a sliding cover (83), a positioning plug rod (84), a guide sleeve (85), an L-shaped connecting rod (86), a spring piece (87) and a pressing column (88), both sides of the outlet end of the pen barrel plastic molding cylinder (6) are provided with the ear plate (80), the two ear plates (80) are uniformly and symmetrically provided with the guide rod (81) on one side, and the sliding cover (83) is arranged between the adjacent two guide rods (81), the outer side of the guide rod (81) is provided with the ejection spring (82) for driving the sliding cover (83) to reset, the front and rear sides of the pen barrel plastic molding cylinder (6) are provided with the guide sleeve (85), the guide sleeve (85) is slidably provided with the L-shaped connecting rod (86), one end of the L-shaped connecting rod (86) is inserted into the connecting plate (5), the connecting plate (5) is provided with the spring piece (87) for driving the L-shaped connecting rod (86) to reset, one end of the L-shaped connecting rod (86) inserted into the connecting plate (5) is provided with the pressing column (88) opposite to the limiting frame (73), one end of the pressing column (88) penetrates the connecting plate (5) and is inserted into the pen barrel plastic molding cylinder (6), the other end of the L-shaped connecting rod (86) is connected with the positioning plug rod (84) in the shape of L, and one side of the sliding cover (83) is provided with the positioning slot matched with the positioning plug rod (84).

5. The plastic pencil shaft molding apparatus of claim 1 wherein: The blanking assembly (9) comprises a storage box (90), a pressing plate (91), a push-pull rod (92), a second tension spring (93), a guide pipe (94), a baffle (95), an operating rod (96) and a driving sleeve (97), the upper end of the fixed plate (2) is provided with the storage box (90) in the shape of a triangle cut horizontally, and the lower surface of the storage box (90) is inclined to the blanking through hole, the rear side of the storage box (90) is provided with the push-pull rod (92), one end of the push-pull rod (92) penetrates the second tension spring (93) provided outside the storage box (90), the push-pull rod (92) is connected with the pressing plate (91) penetrating the second tension spring (93), and both ends of the pressing plate (91) penetrate the storage box (90), the blanking through hole of the storage box (90) is provided with the guide pipe (94), the rear side of the guide pipe (94) is provided with the baffle (95) for blocking the pen core, the rear end of the baffle (95) is connected with the operating rod (96), and the rear end of the support shaft (3) is provided with the driving sleeve (97) for driving the operating rod (96) to pull out.

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