Bottle preform injection molding machine

Abstract

According to the bottle preform injection molding machine provided by the utility model, after materials flow into the first material storage barrel device through the feeding hopper, the spiral push rod is driven to rotate through the first driving device to extrude the materials in the first material storage barrel device, and meanwhile, the valve core of the control valve is opened, so that the second material storage barrel device is communicated with the connecting pipe; after the second charging barrel device is filled with the materials, a valve element of the control valve is closed, then the push rod is driven by the second driving device to move, and the materials in the second driving device are extruded by the push rod to pass through the control valve to be ejected out of the nozzle for forming; according to the utility model, the problem that materials are solidified midway due to small spiral extrusion jet force can be avoided, so that the plasticizing effect is better, and the quality of formed products is good.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molding machines, in particular to a bottle embryo injection molding machine. Background Art

[0002] Preform injection molding machine is a molding equipment that uses plastic molding molds to make plastic products of various shapes from thermoplastic plastics or thermosetting plastics. Types include vertical, horizontal and all-electric types. In the preform injection molding machine, after high pressure is applied to the molten plastic, there are three main forms of injection: plunger type, screw type, and screw pre-plastic plunger injection type. Among them, the most widely used is the screw type. In one cycle of the injection molding machine, a certain amount of plastic can be heated and plasticized within a specified time, and then the molten plastic is injected into the mold cavity through the screw under a certain pressure and speed. After the injection is completed, the molten material injected into the mold cavity is kept in shape.

[0003] For example, the patent document with Chinese patent application number 201820291542.2 and announcement date of November 16, 2018 discloses a preform injection molding machine, and its technical solution is as follows: it includes an injection molding machine body, an injection tube arranged on the injection molding machine body, an insulation layer is arranged on the outer side of the injection tube, a plurality of support rods are arranged between the insulation layer and the outer wall of the injection tube, the insulation layer and the outer wall of the injection tube are supported by the support rods to form a cavity, the cavity formed by the insulation layer and the inner wall of the injection tube is filled with glass wool, and a vent is arranged on the end of the injection tube, such a method can enhance the thermal insulation performance of the injection tube, so as to maintain a certain temperature during the material transportation process.

[0004] The above document is that the material enters the injection tube provided with a heat insulation layer and is directly ejected through the one-way injection tube spiral. However, when a large mold needs to be injected in a large injection molding machine, a large injection volume is required. For one-way spiral injection, a larger screw needs to be made, which has a high cost. In addition, since the material is spirally extruded, the injection force is small, so the material solidifies before reaching the preset position in the mold, thereby affecting the injection molding effect. Utility Model Content

[0005] The utility model aims to provide a preform injection molding machine, which avoids the problem of solidification of materials in the middle due to small spiral extrusion injection force, and achieves better plasticizing effect.

[0006] In order to achieve the above-mentioned purpose, the utility model provides a preform injection molding machine, including an injection molding machine body, a first barrel device, a first driving device, a second barrel device, a second driving device, a control valve and an injection head. The injection molding machine body is arranged on one side of an injection molding platform, and more than two guide columns are arranged on the injection molding machine body along the length direction of the injection molding machine body. The control valve is arranged at one end of the guide column through a sliding seat, and the support seat is fixedly sleeved on the other end of the guide column. A push device is sleeved on the guide column between the sliding seat and the support seat, and the push device is connected to the second driving device arranged at the bottom of the injection molding machine body. The two ends of the second barrel device are respectively connected to the control valve and the push device. The first barrel device arranged on the support seat is connected to the control valve through a connecting pipe, and an injection head is arranged on one side of the control valve. A spiral push rod is arranged in the first barrel device, and the spiral push rod is connected to the first driving device.

[0007] The above arrangement enables the material to first enter the first barrel device, and then be injected into the second barrel device through the connecting pipe and the control valve, and the material in the second barrel device is extruded and ejected by the ejection device, so that the material can be quickly ejected into the large mold. Compared with the prior art, it avoids the problem of solidification of the material in the middle due to small injection force caused by direct spiral extrusion, thereby achieving better injection molding effect, meeting the injection molding requirements of large injection molding machines, and improving the yield rate of products.

[0008] Furthermore, a feed hopper is provided above the first barrel device, and a first heater is wrapped around the outside of the first barrel device.

[0009] The above arrangement enables the material to flow into the first barrel device through the feed hopper, and then the material in the first barrel device is squeezed into the connecting pipe through the spiral extrusion of the spiral push rod. At the same time, during the spiral extrusion process, the material can be heated and plasticized by the first heater.

[0010] Furthermore, the control valve includes a valve body and a valve body mounting seat, a valve core is slidably arranged in the valve body, a through hole 1 and a through hole 2 are arranged on the valve body mounting seat, a through hole is arranged on the valve body, the through hole 1 is communicated with the through hole, a through hole is arranged in the middle of the valve core, a accommodating cavity with an opening at one end is arranged on the valve body mounting seat, and the valve body is detachably arranged in the accommodating cavity; a first annular groove and a second annular groove are respectively arranged on both sides of the through hole, a high-temperature resistant sealing ring is sleeved on the first annular groove, and a high-pressure resistant sealing ring is arranged on the second annular groove, the high-temperature resistant sealing ring and the high-pressure resistant sealing ring are evenly in contact with the inner wall of the valve body, and a detachable driving guide device is arranged between the valve body mounting seat and the valve core.

[0011] The above arrangement can achieve a double sealing effect because two different sealing rings are respectively arranged on both sides of the valve core through hole. Since a valve body mounting seat and a valve body are arranged, the valve core is slidably arranged on the valve body, and the driving guide device is connected to the valve core. Therefore, when installation and disassembly are required, the valve body, the valve core and the driving guide device can be installed and disassembled as a whole. In this way, the valve body is also installed and disassembled. When the valve core needs to be cleaned, the valve body, the valve core and the driving guide device are disassembled as a whole, which is convenient for cleaning the valve body and the valve core. In addition, since the valve core will frequently move relative to the valve body, since the valve body is arranged between the valve body mounting seat and the valve core, when the valve body or the valve core is worn, the valve body mounting seat does not need to be replaced, which can reduce costs.

[0012] Furthermore, the valve body mounting seat includes a valve body mounting seat body and a cover plate, the cover plate is connected to a side wall of the valve body mounting seat body by bolts, the accommodating cavity is formed on the valve body mounting seat body and the cover plate, and the opening of the accommodating cavity is located on the cover plate.

[0013] The driving guide device comprises a driving device and a guiding connection device. The driving device comprises a hydraulic cylinder and a hydraulic cylinder mounting seat. The hydraulic cylinder is fixedly connected to the hydraulic cylinder mounting seat. The guiding connection device is arranged between the valve core and the hydraulic cylinder piston rod.

[0014] A guide groove is arranged on the inner wall of the accommodating cavity on the valve body mounting seat, a guide strip matching the guide groove is arranged on the outer wall of the valve body, and the through hole on the valve core, the through hole on the valve body and the through hole on the valve body mounting seat have the same aperture.

[0015] With the above arrangement, the driving guide device can be connected to the cover plate. When the valve core, valve body and driving guide device need to be disassembled, it is only necessary to separate the cover plate from the valve body mounting seat body, which makes installation and disassembly convenient. By providing the guide strips and guide grooves, the valve body can be guided to enter the accommodating cavity when the valve body is installed. When the material passes through the through hole, the through hole and the through hole, since the apertures of the three are consistent, the flow rate of the through hole material can be controlled by moving the valve core, thereby achieving precise flow control of the material, improving the safety of the equipment and the flexibility of operation, and reducing material loss.

[0016] Furthermore, the guide connection device includes a guide plate, a connecting plate and a guide rod, and the hydraulic cylinder is also provided with a piston rod, the piston rod is fixedly connected to the connecting plate, the connecting plate is fixedly connected to the valve core, the guide plate passes through the valve core and is fixedly connected to the connecting plate, the two sides of the guide plate are respectively slidably connected with guide rods, one end of the guide rod is fixedly connected to the valve body mounting seat, and the other end of the guide rod is fixedly connected to the hydraulic cylinder mounting seat.

[0017] In the above arrangement, the piston rod is fixedly connected to the connecting plate, and the connecting plate is fixedly connected to the valve core, so that the movement of the piston rod can drive the movement of the valve core, the guide plate passes through the valve core and is fixedly connected to the connecting plate, and guide rods are arranged on both sides of the guide plate. The guide plate can provide a guiding effect for the movement of the piston rod so that it moves on the expected motion trajectory, and can provide partial support for the piston rod so that the normal motion trajectory will not be deviated even when the elongation is large.

[0018] Furthermore, the valve core includes a valve core body and a boss arranged at one end of the valve core body, and the boss is relatively provided with two cutting edges, and the cutting edges are horizontally abutted against the inner wall of the guide plate.

[0019] In the above arrangement, the boss is provided with a cutting edge, which abuts against the inner wall of the guide plate, effectively preventing the valve core from rotating during movement, and ensuring that the position of the through hole of the valve core will not rotate when the valve body moves.

[0020] Furthermore, at least one oil groove is arranged on the outer end of the second annular groove on the valve core body, and a sealing gasket is arranged between the valve body mounting seat body and the cover plate.

[0021] In the above arrangement, the oil groove is used to store oil and plays a role of lubrication; the sealing gasket can improve the sealing performance between the cover plate and the valve body mounting seat body.

[0022] Furthermore, the other end of the connecting tube is fixedly connected to the top of the valve body mounting seat body, and a through hole 1 is provided on the top of the valve body mounting seat body, and the connecting tube is connected to the control valve through the through hole 1. One end of the second barrel device is fixedly connected to one side of the valve body mounting seat body, and a through hole 2 is provided on one side of the valve body mounting seat body, and the second barrel device is connected to the control valve through the through hole 2. The injection head is fixedly connected to the other side of the valve body mounting seat body, and a through hole 3 is provided on the other side of the valve body mounting seat body, and the injection head is connected to the control valve through the through hole 3.

[0023] With the above arrangement, after the control valve opens the valve core, the material in the first barrel device can be injected into the second barrel device through the control valve.

[0024] Furthermore, the ejection device includes an injection sliding seat, a push rod and an oil cylinder. The injection sliding seat is sleeved on the guide column. The two ends of the push rod are respectively provided with a piston 1 matching the oil cylinder and a piston 2 matching the second barrel device. The piston is sleeved in the oil cylinder, and the piston 2 is sleeved in the second barrel device. The oil cylinder is fixed in the sliding seat. Valve ports are provided at both ends of the oil cylinder, and the valve ports are connected to the second drive device through a hydraulic pipe.

[0025] The above arrangement can provide pressure to the oil cylinder through the second driving device, thereby driving the push rod to move, so that the second piston compresses the material in the second barrel device. Under the action of the ejection device, the material in the second barrel device can be ejected from the injection head through the control valve for injection molding.

[0026] Furthermore, the first barrel device is arranged parallel to the second barrel device and is located above the second barrel device, the two ends of the connecting tube are respectively arranged perpendicular to the first barrel device and the second barrel device, the diameter of the first barrel device is greater than the diameter of the second barrel device, the length of the first barrel device is greater than the length of the second barrel device, and the cross-sectional shapes of the first barrel device and the second barrel device are both circular.

[0027] The above arrangement allows the material in the first barrel device to flow into the second barrel device along the connecting pipe under the extrusion of the spiral push rod after the valve core of the control valve is opened. At the same time, the connecting pipe can support the first barrel device and fill the second barrel device before injection molding. In this way, under the action of the push rod, the material can be quickly ejected into the mold to achieve material molding. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is the front view of the utility model.

[0029] Figure 2 It is a side view of the utility model.

[0030] Figure 3 It is a top view of the utility model.

[0031] Figure 4 It is a connection diagram of the push rod, the second barrel device and the oil cylinder in the utility model.

[0032] Figure 5 It is a structural schematic diagram of the control valve in the utility model.

[0033] Figure 6 It is a structural schematic diagram of the valve body mounting seat body in the utility model.

[0034] Figure 7 It is an exploded diagram of the control valve in the utility model.

[0035] Figure 8 for Figure 7 Enlarged view of point A in the middle.

[0036] Fig. 9 This is a schematic diagram of the connection between the guide plate, valve body and valve core in the utility model.

[0037] Fig.10 It is a schematic diagram of the connection between the valve body and the valve core in the utility model.

[0038] Fig.11 This is the front view of the valve core in the utility model. DETAILED DESCRIPTION

[0039] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0040] like Figure 1-11 As shown, the utility model provides a preform injection molding machine, including an injection molding machine body a4, a first barrel device a1, a first drive device a11, a second barrel device a2, a second drive device a22 and a control valve a3, wherein the injection molding machine body a4 is arranged on one side of an injection molding platform 100, and more than two guide posts a5 are arranged on the injection molding machine body a4 along the length direction of the injection molding machine body a4. In this embodiment, the guide post a5 is fixed to the injection molding machine body a4 by supporting seats a60 arranged at both ends of the guide post a5, and two parallel guide posts a5 are arranged, and more than two limit seats a6 are arranged between the two supporting seats a60 on the injection molding machine body a4, and the limit seat a6 supports the middle part of the guide rod a5 to prevent the guide rod a5 from collapsing downward in the middle part due to excessive length. The phenomenon of ensuring the straightness of the guide rod a5, the control valve a3 is arranged at one end of the guide column a5 through the sliding seat a7, the support seat a8 is slidably sleeved on the other end of the guide column a5, and a push-in device is sleeved between the sliding seat a7 and the support seat a8 on the guide column a5, and the push-in device is connected to the second drive device a22 arranged at the bottom of the injection molding machine body a4, and the two ends of the second barrel device a2 are respectively connected to the control valve a3 and the push-in device, and the first barrel device a1 arranged on the support seat a8 is connected to the control valve a3 through the connecting pipe a9, and an injection head a31 connected to the second barrel device is arranged on one side of the control valve a3, and a screw push rod a12 is installed in the first barrel device a1 through a bearing, and the screw push rod a12 is connected to the first drive device a11 arranged on the support seat a8. In this embodiment, the first barrel device and the second barrel device are both barrels.

[0041] like Figure 1-3 As shown, a feed hopper a13 is provided above the first barrel device a1, and the material can flow into the first barrel device a1 through the feed hopper a13. The first barrel device a1 is wrapped with a first heater on the outside, and the material in the first barrel device a1 can be plasticized through the first heater. The rear end of the screw push rod a12 extends out of the first barrel device. In this embodiment, the first driving device includes a motor, a driving wheel arranged on the motor, a driven wheel arranged on the screw push rod, and a belt sleeved on the driving wheel and the driven wheel. When the motor is working, the screw push rod is driven to rotate through the driving wheel and the belt, so that the material in the first barrel device can be heated, sheared and transported. The motor is fixedly mounted on the support frame a14, and the support frame a14 is fixed on the support seat a8.

[0042] like Figure 5-11 As shown, the valve body comprises a valve body mounting seat 1, a valve body 2, a valve core 3 and a driving guide device 4.

[0043] The valve body mounting seat 1 comprises a valve body mounting seat body 101 and a cover plate 102. The cover plate 102 is connected to a side wall of the valve body mounting seat body 101 by bolts. A transversely extending accommodation cavity 104 is formed in the valve body mounting seat body 101 and the cover plate 102. The cross section of the accommodation cavity 104 is square. The accommodation cavity 104 cooperates with the valve body 2. The opening 1041 of the accommodation cavity is located on the cover plate 102. In order to improve the sealing performance, a sealing gasket 103 is arranged between the valve body mounting seat body 101 and the cover plate 102. A through hole 11 extending up and down is arranged on the valve body mounting seat body 101. The through hole 11 is communicated with the accommodation cavity 104.

[0044] The outer cross-section of the valve body 2 is square, and the valve body 2 is detachably arranged in the accommodating cavity 104. In order to better install the valve body 2 into the accommodating cavity 104, a guide groove 105 is provided on the inner wall of the accommodating cavity on the valve body mounting seat 1, and a guide strip 22 matching the guide groove is provided on the outer wall of the valve body. A through hole 21 communicating with the through hole 11 is provided on the valve body 2.

[0045] A valve core 3 is slidably arranged in the valve body 2, a through hole 35 is arranged in the middle of the valve core 3, a first annular groove 33 and a second annular groove 34 are arranged on both sides of the through hole 35, a high temperature resistant sealing ring is sleeved on the first annular groove 33, and a high pressure resistant sealing ring is sleeved on the second annular groove 34, the valve core 3 includes a valve core body 30 and a boss 31 arranged at one end of the valve core body, an oil groove 32 is arranged on the outer end of the second annular groove 34 on the valve core body, and the oil groove 32 is used to store oil, which can play a role in lubrication when the valve core is in motion. A driving guide device 4 is also arranged between the valve body mounting seat 1 and the valve core 3, and a high temperature resistant sealing ring and a high pressure resistant sealing ring are arranged on both sides of the through hole 35 of the valve core 3, respectively. By arranging two different sealing rings, material leakage is effectively prevented, so that the driving guide device 4 ensures the sealing between the valve core 3 and the valve body 2 when the valve core 3 is controlled to move on the valve body 2, and ensures that the valve core 3 will not leak material during the movement.

[0046] The valve body mounting seat 1 is connected to the material, and the material can reach the valve body mounting seat 1 through the through hole 11 and then reach the valve body 2.

[0047] The through hole 35 on the valve core 3, the through hole 21 on the valve body 2 and the through hole 11 on the valve body mounting seat 1 have the same aperture. When the material passes through the through hole 11, the through hole 21 and the through hole 35, since the apertures of the three are the same, the flow rate of the material in the through hole 35 can be controlled by moving the valve core 3, thereby achieving precise flow control of the material, improving the safety of the equipment and the flexibility of operation, and reducing material loss.

[0048] like Figure 7-8 As shown, the driving guide device 4 includes a driving device 5 and a guiding connection device. The driving device 5 includes a hydraulic cylinder 51 and a hydraulic cylinder mounting seat 52. The hydraulic cylinder 51 is fixedly connected to the hydraulic cylinder mounting seat 52. The hydraulic cylinder 51 needs to work in a stable working environment. The hydraulic cylinder 51 is fixedly connected to the hydraulic cylinder mounting seat 52. The fixed connection ensures that the hydraulic cylinder 51 is in a stable position during use and will not be displaced due to external force and self-impact, so that the vibration generated by the hydraulic cylinder 51 during operation can be effectively isolated, thereby reducing the vibration impact on the overall equipment.

[0049] like Figure 7 As shown, the guide connection device includes a guide plate 41, a connecting plate 42 and a guide rod 43. The hydraulic cylinder 51 is also provided with a piston rod 511. The piston rod 511 is fixedly connected to the connecting plate 42. The connecting plate 42 is fixedly connected to the valve core 3. The guide plate 41 passes through the boss 31 of the valve core 3 and is fixedly connected to the connecting plate 42. The two sides of the guide plate 41 are respectively slidably connected with the guide rod 43. One end of the guide rod 43 is fixedly connected to the valve body mounting seat, and the other end of the guide rod 43 is fixedly connected to the hydraulic cylinder mounting seat 52. The piston rod 511 is fixedly connected to the connecting plate 42. 42 is fixedly connected, the connecting plate 42 is fixedly connected to the valve core 3, so that the movement of the piston rod 511 can drive the movement of the valve core 3, the guide plate 41 passes through the boss 31 on the valve core 3 and is fixedly connected to the connecting plate 42, and guide rods 43 are arranged on both sides of the guide plate 41. The guide plate 41 can provide a guiding effect for the movement of the piston rod 511, so that it moves on the expected motion trajectory, and can provide partial support for the piston rod 511, so that when the elongation is large, it can ensure that the normal motion trajectory will not be offset.

[0050] like Fig. 9 and Fig.10 As shown, the boss 31 of the valve core 3 is relatively provided with two cutting edges 311, and the cutting edges 311 are horizontally abutted against the inner wall of the guide plate 41. The boss 31 is provided on the valve core 3 to limit the movement of the valve core 3 in the valve body 2 to prevent the valve core 3 from excessive movement. The boss 31 is provided with a cutting edge 311, and the cutting edge 311 is abutted against the inner wall of the guide plate 41, which effectively prevents the valve core 3 from rotating during the movement, and ensures that the position of the through hole 35 of the valve core 3 will not rotate when the valve body 2 moves.

[0051] The valve body 2 is provided with a valve core hole for accommodating the sliding of the valve core 3. The valve body 2 is also provided with a through hole 21. The valve core hole provided in the valve body 2 ensures the stability of the valve core 3 during the movement and helps to smooth the movement of the valve core 3. The valve body 2 is provided with a through hole 21. When the through hole 35 on the valve core 3 moves to the relative position of the through hole 21, the material can pass through the through hole 21 to reach the through hole 35 on the valve core 3.

[0052] like Figure 1-3 As shown, one end of the first barrel device a1 is fixed on the support seat a8, the other end of the first barrel device a1 is connected to one end of the connecting pipe a9, the other end of the connecting pipe a9 is fixedly connected to the top of the valve body mounting seat body, a second heater is arranged outside the connecting pipe a9, and the material passing through the connecting pipe can be further plasticized by the second heater, a through hole 11 is arranged on the top of the valve body mounting seat body, the connecting pipe a9 is connected to the control valve a3 through the through hole 11, one end of the second barrel device a2 is fixedly connected to one side of the valve body mounting seat body, one side of the valve body mounting seat body is provided with a through hole 2 12, the second barrel device a2 It is connected with the control valve a3 through the second through hole 12, and a third heater is arranged outside the second barrel device, and the material in the second barrel device can be further plasticized by the third heater. The injection head a31 is fixedly connected with the other side of the valve body mounting seat body, and a through hole three (not marked in the figure) is arranged on the other side of the valve body mounting seat body. The injection head a31 is connected with the control valve a3 through the through hole three, so that after the control valve a3 opens the valve core, the material in the first barrel device a1 can be injected into the second barrel device a2 through the control valve a3. The injection head is provided with a fourth heater outside, and the material can be heated and plasticized by the fourth heater.

[0053] like Figure 1-4 As shown, the ejection device includes an injection sliding seat a21, a push rod a23 and a cylinder a24. The injection sliding seat a21 is sleeved on the guide column a5. The two ends of the push rod a23 are respectively provided with a piston a25 matching the cylinder a24 and a piston a26 matching the second barrel device a2. The piston a25 is sleeved in the cylinder a24, and the piston a26 is sleeved in the second barrel device a2. The cylinder a24 is fixed on the sliding seat a21. The two ends of the cylinder a24 are provided with valve ports (not shown in the figure). The port is connected to the second drive device a2 through a hydraulic pipe (not marked in the figure), so that pressure can be provided to the oil cylinder a24 through the second drive device a2, thereby driving the push rod a23 to move, and then the piston a26 compresses the material in the second barrel device a2. After opening the control valve a3, the material in the second barrel device a2 can be ejected from the injection head a31 through the control valve a3 for injection molding. In this embodiment, the second drive device a2 is a hydraulic pump, and the hydraulic pump is connected to the oil tank a27 through a hydraulic pipe.

[0054] like Figure 1 As shown, the first barrel device a1 is arranged in parallel with the second barrel device a2 and is located above the second barrel device a2, and the two ends of the connecting pipe a9 are respectively arranged perpendicular to the first barrel device a1 and the second barrel device a2, the diameter of the first barrel device a1 is greater than the diameter of the second barrel device a2, the length of the first barrel device a1 is greater than the length of the second barrel device a2, and the cross-sectional shapes of the first barrel device a1 and the second barrel device a2 are both circular, so that after the valve core of the control valve a3 is opened, the material in the first barrel device a1 can flow into the second barrel device a2 along the connecting pipe a9 under the extrusion action of the spiral push rod a12, and at the same time, the first barrel device a1 can be supported by the connecting pipe a9, and the second barrel device a2 can be filled before injection molding, so that under the action of the push rod a23, the material can be quickly injected into the mold to achieve plasticization.

[0055] The working principle of the utility model is as follows: after the material flows into the first barrel device a1 through the feed hopper a13, the spiral push rod a12 is driven to rotate by the first driving device a11 to squeeze the material in the first barrel device a1, and at the same time, the valve core of the control valve a3 is opened, so that the second barrel device a2 is connected with the connecting pipe a9, and then the material flows into the second barrel device a2 through the connecting pipe a9. After the material fills the second barrel device a2, the valve core of the control valve a3 is closed, and then the push rod a23 is driven to move by the second driving device a22, and the material in the second driving device a2 is squeezed by the push rod a23 and ejected from the injection head a31 through the control valve a3 to enter the mold.

[0056] In this embodiment, the material can enter the first barrel device first, and then be injected into the second barrel device through the connecting pipe and the control valve, and the material in the second barrel device is squeezed and ejected by the ejection device, so that the material can be quickly ejected into the large mold. Compared with the prior art, it avoids the problem of solidification of the material in the middle due to small injection force caused by direct spiral extrusion, thereby achieving better injection molding effect, meeting the injection molding requirements of large injection molding machines, and improving the yield rate of products.

Claims

1. A preform injection molding machine, comprising an injection molding machine body, a first barrel device, a first drive device, a second barrel device, a second drive device, a control valve and an injection head, characterized in that: The injection molding machine body is arranged on one side of the injection molding platform, and more than two guide columns are arranged on the injection molding machine body along the length direction of the injection molding machine body. The control valve is arranged at one end of the guide column through a sliding seat, and the support seat is slidably sleeved on the other end of the guide column. A pushing device is sleeved on the guide column between the sliding seat and the support seat. The pushing device is connected to a second driving device arranged at the bottom of the injection molding machine body, and two ends of the second barrel device are respectively connected to the control valve and the pushing device. The first barrel device is connected to the control valve through a connecting pipe, and an injection head is arranged on one side of the control valve. A spiral push rod is arranged in the first barrel device, and the spiral push rod is connected to the first driving device.

2. A preform injection molding machine according to claim 1, characterized in that: A feed hopper is arranged above the first barrel device, and a first heater is wrapped outside the first barrel device.

3. The preform injection molding machine according to claim 1, characterized in that: The control valve includes a valve body and a valve body mounting seat, a valve core is slidably arranged in the valve body, a through hole 1 and a through hole 2 are arranged on the valve body mounting seat, a through hole is arranged on the valve body, the through hole 1 is communicated with the through hole, a through hole is arranged in the middle of the valve core, a accommodating cavity with an opening at one end is arranged on the valve body mounting seat, and the valve body is detachably arranged in the accommodating cavity; a first annular groove and a second annular groove are respectively arranged on both sides of the through hole, a high-temperature resistant sealing ring is sleeved on the first annular groove, and a high-pressure resistant sealing ring is arranged on the second annular groove, the high-temperature resistant sealing ring and the high-pressure resistant sealing ring are evenly in contact with the inner wall of the valve body, and a detachable driving guide device is arranged between the valve body mounting seat and the valve core.

4. A preform injection molding machine according to claim 3, characterized in that: The valve body mounting seat comprises a valve body mounting seat body and a cover plate, the cover plate is connected to a side wall of the valve body mounting seat body by bolts, an accommodating cavity is formed on the valve body mounting seat body and the cover plate, and an opening of the accommodating cavity is located on the cover plate; The driving guide device comprises a driving device and a guiding connection device, wherein the driving device comprises a hydraulic cylinder and a hydraulic cylinder mounting seat, wherein the hydraulic cylinder is fixedly connected to the hydraulic cylinder mounting seat, and the guiding connection device is arranged between the valve core and the hydraulic cylinder piston rod; A guide groove is arranged on the inner wall of the accommodating cavity on the valve body mounting seat, a guide strip matching the guide groove is arranged on the outer wall of the valve body, and the through hole on the valve core, the through hole on the valve body and the through hole on the valve body mounting seat have the same aperture.

5. A preform injection molding machine according to claim 4, characterized in that: The guide connection device includes a guide plate, a connecting plate and a guide rod. The hydraulic cylinder is also provided with a piston rod. The piston rod is fixedly connected to the connecting plate, and the connecting plate is fixedly connected to the valve core. The guide plate passes through the valve core and is fixedly connected to the connecting plate. Guide rods are slidably connected on both sides of the guide plate. One end of the guide rod is fixedly connected to the valve body mounting seat, and the other end of the guide rod is fixedly connected to the hydraulic cylinder mounting seat.

6. The preform injection molding machine according to claim 4, characterized in that: The valve core comprises a valve core body and a boss arranged at one end of the valve core body, the boss is relatively provided with two cutting edges, and the cutting edges are horizontally abutted against the inner wall of the guide plate.

7. A preform injection molding machine according to claim 6, characterized in that: The valve core body is provided with more than one oil groove at the outer end of the second annular groove, and a sealing gasket is provided between the valve body mounting seat body and the cover plate.

8. The preform injection molding machine according to claim 1, characterized in that: The other end of the connecting pipe is fixedly connected to the top of the valve body mounting seat body, and a through hole 1 is provided on the top of the valve body mounting seat body. The connecting pipe is connected to the control valve through the through hole 1. One end of the second barrel device is fixedly connected to one side of the valve body mounting seat body, and a through hole 2 is provided on one side of the valve body mounting seat body. The second barrel device is connected to the control valve through the through hole 2. The injection head is fixedly connected to the other side of the valve body mounting seat body, and a through hole 3 is provided on the other side of the valve body mounting seat body. The injection head is connected to the control valve through the through hole 3.

9. The preform injection molding machine according to claim 1, characterized in that: The ejection device includes an injection sliding seat, a push rod and an oil cylinder. The injection sliding seat is sleeved on the guide column. The two ends of the push rod are respectively provided with a piston 1 matching the oil cylinder and a piston 2 matching the second barrel device. The piston is sleeved in the oil cylinder, and the piston 2 is sleeved in the second barrel device. The oil cylinder is fixed on the sliding seat. The two ends of the oil cylinder are provided with valve ports, which are connected to the second drive device through a hydraulic pipe.

10. The preform injection molding machine according to claim 1, characterized in that: The first barrel device is arranged parallel to the second barrel device and the first barrel device is located above the second barrel device. The two ends of the connecting tube are respectively arranged perpendicular to the first barrel device and the second barrel device. The diameter of the first barrel device is greater than the diameter of the second barrel device. The length of the first barrel device is greater than the length of the second barrel device. The cross-sectional shapes of the first barrel device and the second barrel device are both circular.

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