Preplasticizing device

Abstract

The utility model belongs to injection blowing machine technical field, concretely relates to a kind of preplastic device, comprising: support seat;Injection mechanism, it includes injection cavity and injection screw rod, the injection cavity is set in the front end of support seat, the front end of the injection cavity is provided with injection nozzle, the top wall of the injection cavity is opened with feed inlet, the injection screw rod is inserted in injection cavity, the injection screw rod is suitable for rotation to make the material of feed inlet delivery to injection nozzle;Heating mechanism, it is cladded in the lateral wall of the injection cavity, to heat the material in the injection cavity;Driving mechanism, it includes axial movement pair and rotation pair, the axial movement pair is set in the rear end of support seat, the rotation pair is set in the movement end of the axial movement pair, the rotation pair rotates axis is forward and penetrates axial movement pair, and is connected with injection screw rod, to drive the injection screw rod rotation.

Description

Technical Field

[0001] This utility model belongs to the field of injection blow molding machine technology, and specifically relates to a pre-plasticizing device. Background Technology

[0002] Injection blow molding machines are specialized equipment used to produce hollow plastic containers. They combine injection molding and blow molding processes and are mainly used in the manufacture of precision packaging containers in the food, pharmaceutical, and daily chemical industries.

[0003] Pre-plasticizing is a pretreatment stage in injection blow molding that transforms solid plastic particles into a homogeneous melt, providing molten plastic for subsequent blow molding. Existing pre-plasticizing devices typically use a screw conveyor in conjunction with a heating mechanism to spirally transport the material to the injection nozzle. The molten plastic is then injected into the mold by the continued rotation of the injection screw. However, this injection method results in relatively low injection pressure, leading to insufficient filling of the mold and affecting product quality. To address these shortcomings, a certain space is usually reserved between the injection screw and the injection nozzle to accommodate the molten plastic, and a drive mechanism is connected to the rear end of the injection screw. When material needs to be injected, the drive mechanism pushes the injection screw forward, and after injection, the drive mechanism pulls the injection screw back to create space. However, when the drive mechanism pulls the injection screw back, it can easily bring back the material squeezed into the mold, resulting in insufficient filling of the mold.

[0004] Therefore, how to avoid insufficient filling in the mold is a technical problem that urgently needs to be solved in this field.

[0005] It should be noted that the information disclosed in this background section is only for understanding the background technology of the present application concept, and therefore, the above description is not considered to constitute prior art information. Utility Model Content

[0006] This disclosure provides at least one pre-plasticizing device.

[0007] In a first aspect, embodiments of this disclosure provide a pre-plasticizing device, comprising: a support base; an injection mechanism including an injection chamber and an injection screw, the injection chamber being disposed at the front end of the support base, the front end of the injection chamber being provided with an injection nozzle, the top wall of the injection chamber having a feed inlet, the injection screw being inserted into the injection chamber, the injection screw being adapted to rotate to convey material from the feed inlet to the injection nozzle; a heating mechanism covering the side wall of the injection chamber to heat the material in the injection chamber; and a driving mechanism including an axial moving joint and a rotating joint, the axial moving joint... The rotary joint is located at the rear end of the support base, and the rotary joint is located at the moving end of the axial sliding joint. The rotary joint's rotation axis passes forward through the axial sliding joint and is connected to the injection screw to drive the injection screw to rotate. When the injection nozzle is connected to the mold, the rotary joint is adapted to follow the axial sliding joint to move forward and extrude the material so that the material is injected from the injection nozzle into the mold. When the mold is full of material, the axial sliding joint becomes passive, and the rotary joint continues to drive the injection screw to rotate, so that the material at the injection nozzle is pressurized and pushes the injection screw back.

[0008] In one optional embodiment, the injection mechanism further includes a horizontally arranged injection cylinder, the injection chamber being opened inside the injection cylinder, the injection nozzle being disposed at the front end of the injection cylinder, and the heating mechanism covering the side wall of the injection cylinder; the rear end of the injection cylinder is inserted into a support base, and a flange is provided on the side wall of the injection cylinder, the flange being detachably connected to the support base.

[0009] In one optional embodiment, the axial sliding pair includes a pair of hydraulic cylinders, a driven shaft, and a mounting plate; the hydraulic cylinders are respectively disposed on the side wall of the support base, the driven shaft is slidably disposed at the rear end of the support base, the driven shaft is coaxially disposed with the injection screw, the mounting plate is disposed at the end of the driven shaft, the mounting plate is connected to the piston rod of the hydraulic cylinder, and the rotary pair is disposed on the side wall of the mounting plate; and the axis of the driven shaft has a through hole, and the output shaft of the rotary pair passes through the through hole and is connected to the injection screw.

[0010] In one optional embodiment, the support base is hollow, the rear end of the support base is open and has an end cap, the passive shaft is slidably mounted on the end cap, the support base has a support ring, the inserted end of the passive shaft has an integral fitting ring, the fitting ring and the support ring are clearance-fitted, and an O-ring is fitted on the fitting ring.

[0011] In one optional embodiment, the rotary joint includes a servo motor disposed on the side wall of the mounting plate; a connecting shaft is slidably disposed within the through hole, the front end of the connecting shaft being connected to an injection screw, and the rear end of the connecting shaft being connected to the output shaft of the servo motor; and a retaining ring is disposed on the side wall of the connecting shaft, the retaining ring being adapted to abut against the end of the passive shaft to transmit thrust.

[0012] In one optional embodiment, a shrink sleeve is provided at the front end of the connecting shaft, and the rear end of the injection screw is inserted into the shrink sleeve; and a keyway is provided in the shrink sleeve, and a key block is provided at the rear end of the injection screw, the key block being engaged in the keyway to transmit torque; a connecting hole is provided at the rear end of the connecting shaft, the output shaft of the servo motor is inserted into the connecting hole, and the connecting hole and the output shaft of the servo motor are connected by a spline to transmit torque.

[0013] In one optional embodiment, a feeding mechanism is further included, which includes a feeding bracket and a feeding bucket; the feeding bracket is disposed on the top of the support base, the feeding bracket has a feeding hole that communicates with the feed inlet, the feeding bucket is disposed on the top of the feeding bracket, and the outlet of the feeding bucket communicates with the feeding hole.

[0014] In one optional embodiment, a support plate is provided at the top of the feeding bracket; a fastening plate is provided at the bottom of the feeding bucket, the fastening plate fastening the two sides of the support plate so that the feeding bucket is slidably disposed, so that the outlet of the feeding bucket is misaligned with the feeding hole to stop feeding; and a discharge hole is provided on the support plate, the discharge hole being adapted to slide the feeding bucket to the discharge hole to discharge the material.

[0015] In one optional embodiment, the heating mechanism includes a plurality of heating coils that cover the sidewall of the injection cavity, and a heat insulation cover is provided above the injection cavity.

[0016] In one alternative embodiment, the support also includes a base, the top of which is provided with a pair of slide rails; the bottom of the support is provided with two pairs of sliding blocks, each pair of sliding blocks being slidably disposed on the slide rails, so that the support moves closer to / away from the mold.

[0017] The beneficial effect of this utility model is that the pre-plasticizing device sets a rotary joint at the moving end of the axial moving joint. The output shaft of the rotary joint is connected to the injection screw. When high-pressure injection is required, the axial moving joint drives the rotary joint to push the injection screw forward synchronously. After the injection is completed, the axial moving joint turns to a passive state, and the rotary joint continues to drive the injection screw to continue to deliver material to the injection nozzle. Since the mold is already full, the pressure of the material at the injection nozzle continues to increase, pushing the injection screw backward to drive the axial moving joint and the rotary joint to reset synchronously, avoiding the injection screw from actively resetting, which would cause the material in the mold to be carried back.

[0018] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objectives and other advantages of this invention are realized and obtained through the structures particularly pointed out in the description, claims, and drawings.

[0019] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0020] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 A perspective view of a pre-plasticizing device provided in an embodiment of this disclosure; Figure 2 A cross-sectional view of a pre-plasticizing device provided in an embodiment of this disclosure; Figure 3 An exploded view of a pre-plasticizing device provided in an embodiment of this disclosure.

[0022] In the picture: 1. Support base; 11. End cap; 12. Support ring; 13. Sliding block; 2. Injection facilities; 21. Injection barrel; 21a. Injection chamber; 21b. Injection nozzle; 21c. Feed inlet; 21d. Flange; 22. Injection screw; 3. Heating mechanism; 31. Heating coil; 32. Heat insulation cover; 4. Drive mechanism; 41. Axial moving pair; 41a. Hydraulic cylinder; 41b. Driven shaft; 41c. Mounting plate; 41d. Through hole; 41e. Fitting ring; 41f. Connecting shaft; 41g. Supporting ring; 41h. Expansion sleeve; 41i. Connecting hole; 42. Rotary joint; 42a. Servo motor; 5. Feeding mechanism; 51. Feeding bracket; 51a. Feeding hole; 51b. Support plate; 51c. Discharge hole; 52. Feeding bucket; 52a. Fastening plate; 6. Base; 61. Slide rail. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0024] In this document, when it is mentioned that a first component is located on a second component, this can mean that the first component can be directly formed on the second component, or that a third component can be inserted between the first and second components. Furthermore, in the accompanying drawings, the thickness of the components may be exaggerated or reduced for the purpose of effectively describing the technical content.

[0025] The terminology used herein is for the purpose of describing specific exemplary configurations only and is not intended to be limiting. As used herein, the singular articles “a,” “an,” and “the” may also be intended to include plural forms unless otherwise clearly stated herein. The terms “comprising,” “including,” and “having” are inclusive and thus specify the presence of features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein should not be construed as requiring them to be performed in the specific order discussed or shown, unless specifically identified as such. Additional or alternative steps may be employed.

[0026] As used herein, the phrases “in one embodiment,” “according to one embodiment,” “in some embodiments,” etc., generally refer to the fact that a particular feature, structure, or characteristic following the phrase can be included in at least one embodiment of this disclosure. Therefore, a particular feature, structure, or characteristic can be included in more than one embodiment of this disclosure, such that these phrases do not necessarily refer to the same embodiment. As used herein, the terms “example,” “exemplary,” etc., are used to “serve as an example, instance, or illustration.” Any implementation, aspect, or design described herein as “example” or “exemplary” is not necessarily to be construed as preferred or superior to other implementations, aspects, or designs. Rather, the use of the terms “example,” “exemplary,” etc., is intended to present concepts in a specific manner.

[0027] Research has revealed that in existing technologies, the injection screw can easily carry away material from the mold during active retraction, leading to insufficient filling of the mold and defective products. This is the problem and objective that the utility model aims to solve.

[0028] Based on the above research, this disclosure provides a pre-plasticizing device. After injection is completed, the axial moving pair turns to a passive state, and the rotary pair continues to drive the injection screw to continue conveying material to the injection nozzle. Since the mold is already filled, the pressure of the material at the injection nozzle continues to increase, pushing the injection screw backward to drive the axial moving pair and the rotary pair to reset synchronously, avoiding the injection screw from actively resetting, which would cause the material in the mold to be carried back.

[0029] The shortcomings of the above solutions are the result of the utility model inventor's practice and careful research. Therefore, the discovery process of the above problems and the solutions proposed in this disclosure should be considered as contributions made by the utility model inventor to this disclosure.

[0030] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0031] The following detailed description, with reference to the accompanying drawings, describes some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0032] See Figures 1 to 3The image shows a pre-plasticizing device, comprising: a support base 1; an injection mechanism 2, which includes an injection chamber 21a and an injection screw 22, the injection chamber 21a being disposed at the front end of the support base 1, the front end of the injection chamber 21a being provided with an injection nozzle 21b, the top wall of the injection chamber 21a having a feed inlet 21c, the injection screw 22 being inserted into the injection chamber 21a, the injection screw 22 being adapted to rotate to convey material from the feed inlet 21c to the injection nozzle 21b; and a heating mechanism 3, which covers the injection... The sidewall of cavity 21a is used to heat the material inside the injection cavity 21a; the drive mechanism 4 includes an axial sliding joint 41 and a rotary joint 42. The axial sliding joint 41 is located at the rear end of the support base 1, and the rotary joint 42 is located at the moving end of the axial sliding joint 41. The rotation axis of the rotary joint 42 passes forward through the axial sliding joint 41 and is connected to the injection screw 22 to drive the injection screw 22 to rotate; wherein, when the injection nozzle 21b is in communication with the mold, the rotary joint 42 is adapted to follow the axial direction. The axial sliding joint 41 moves forward to compress the material, injecting it from the injection nozzle 21b into the mold. Once the mold is full, the axial sliding joint 41 becomes passive, and the rotary joint 42 continues to drive the injection screw 22 to rotate, pressurizing the material at the injection nozzle 21b and pushing back the injection screw 22. In short, by setting a rotary joint 42 at the moving end of the axial sliding joint 41, and connecting the output shaft of the rotary joint 42 to the injection screw 22, when high-pressure injection is required, the axial sliding joint 41 drives... The rotary joint 42 synchronously pushes the injection screw 22 forward, and after the injection is completed, the axial sliding joint 41 turns to a passive state (that is, the oil pressure is released when using a hydraulic cylinder). The rotary joint 42 continues to drive the injection screw 22 to continue to deliver material to the injection nozzle 21b. Since the mold is already full, the pressure of the material at the injection nozzle 21b continues to increase, pushing the injection screw 22 backward to drive the axial sliding joint 41 and the rotary joint 42 to reset synchronously, avoiding the injection screw 22 from actively resetting, which would cause the material in the mold to be carried back.

[0033] In some embodiments, the injection mechanism 2 further includes a horizontally arranged injection cylinder 21, an injection chamber 21a is formed inside the injection cylinder 21, an injection nozzle 21b is disposed at the front end of the injection cylinder 21, and the heating mechanism 3 covers the side wall of the injection cylinder 21; the rear end of the injection cylinder 21 is inserted into the support base 1, and the side wall of the injection cylinder 21 is provided with a flange 21d, which is detachably connected to the support base 1; in short, the injection cylinder 21 is inserted into the support base 1 and detachably connected to the support base 1 through the flange 21d, and the injection nozzle 21b is bolted to the front end of the injection cylinder 21 to realize the injection of molten plastic.

[0034] In some embodiments, the axial moving pair 41 includes a pair of hydraulic cylinders 41a, a driven shaft 41b, and a mounting plate 41c. The hydraulic cylinders 41a are respectively disposed on the side walls of the support base 1. The driven shaft 41b is slidably disposed at the rear end of the support base 1 and is coaxially disposed with the injection screw 22. The mounting plate 41c is disposed at the end of the driven shaft 41b and is connected to the piston rod of the hydraulic cylinders 41a. The rotary pair 42 is disposed on the side wall of the mounting plate 41c. Furthermore, the axis of the driven shaft 41b is provided with a through hole 41d, and the output shaft of the rotary pair 42 passes through the through hole 41d and is connected to the injection screw 22. In short, the hydraulic cylinders 41a are stacked on both sides of the support base 1. The operation of the hydraulic cylinders 41a drives the mounting plate 41c to slide towards the front end. At the same time, since the rotary pair 42 is connected to the injection screw 22, it synchronously drives the injection screw 22 forward to complete the injection of molten material.

[0035] In some embodiments, the support base 1 is hollow, and an end cap 11 is provided at the rear end of the support base 1. The passive shaft 41b is slidably disposed on the end cap 11. A support ring 12 is provided inside the support base 1. A fitting ring 41e is integrally provided at the insertion end of the passive shaft 41b. The fitting ring 41e is clearance-fitted with the support ring 12, and an O-ring is sleeved on the fitting ring 41e. In short, the support ring 12 is provided inside the support base 1, and the fitting ring 41e is provided at the insertion end of the passive shaft 41b. The support ring 12 can effectively limit the fitting ring 41e, so that the axis of the passive shaft 41b does not deviate when it moves back and forth, ensuring that it is coaxial with the injection screw 22 and preventing the injection screw 22 from being bent when it is pushed.

[0036] In some embodiments, the rotary joint 42 includes a servo motor 42a, which is disposed on the side wall of the mounting plate 41c; a connecting shaft 41f is slidably disposed within the through hole 41d, the front end of the connecting shaft 41f is connected to the injection screw 22, and the rear end of the connecting shaft 41f is connected to the output shaft of the servo motor 42a; and a retaining ring 41g is disposed on the side wall of the connecting shaft 41f, the retaining ring 41g being adapted to abut the end of the passive shaft 41b to transmit thrust; in short, the servo motor 42a is mounted on the side wall of the mounting plate 41c, the output shaft of the servo motor 42a passes through the mounting plate 41c and is connected to the connecting shaft 41f to drive the injection screw 22 to rotate, and when the passive shaft 41b moves forward, its end contacts and pushes against the retaining ring 41g, driving the connecting shaft 41f forward to expel material from the injection nozzle 21b.

[0037] In some embodiments, the front end of the connecting shaft 41f is provided with a shrinking sleeve 41h, and the rear end of the injection screw 22 is inserted into the shrinking sleeve 41h; and, a keyway is provided in the shrinking sleeve 41h, and a key block is provided at the rear end of the injection screw 22, the key block being engaged in the keyway to transmit torque; a connecting hole 41i is provided at the rear end of the connecting shaft 41f, the output shaft of the servo motor 42a is inserted into the connecting hole 41i, and the connecting hole 41i and the output shaft of the servo motor 42a are connected by a spline to transmit torque; in short, the injection screw 22 is connected to the connecting shaft 41f through the shrinking sleeve 41h, and the injection screw 22 and the shrinking sleeve 41h transmit torque through the keyway and the key block; the rear end of the connecting shaft 41f has a connecting hole 41i to provide a spline, and the output shaft of the servo motor 42a also has a spline to transmit torque.

[0038] In some embodiments, a feeding mechanism 5 is further included, which includes a feeding bracket 51 and a feeding bucket 52. The feeding bracket 51 is disposed on the top of the support base 1, and a feeding hole 51a is provided in the feeding bracket 51. The feeding hole 51a communicates with the feed hole. The feeding bucket 52 is disposed on the top of the feeding bracket 51, and the outlet of the feeding bucket 52 communicates with the feeding hole 51a. In short, the feeding bucket 52 is disposed on the top of the support base 1 through the feeding bracket 51, and the outlet, feeding hole 51a and feed hole of the feeding bucket are connected to each other so that the plastic particles in the feeding bucket 52 fall into the injection chamber 21a.

[0039] In some embodiments, a support plate 51b is provided at the top of the feeding bracket 51; a fastening plate 52a is provided at the bottom of the feeding bucket 52, the fastening plate 52a fastening both sides of the support plate 51b, so that the feeding bucket 52 is slidably disposed, so that the outlet of the feeding bucket 52 is misaligned with the feeding hole 51a to stop feeding; and, a discharge hole 51c is provided on the support plate 51b, the discharge hole 51c being adapted to slide the feeding bucket 52 to the discharge hole 51c to discharge material; in short, the fastening plate 52a at the bottom of the feeding bucket 52 fastens the support plate 51b, so that the feeding bucket 52 can slide on the top of the support plate 51b, and by sliding the feeding bucket 52, the outlet of the feeding bucket 52 is misaligned with the feeding hole to stop feeding material; furthermore, when the feeding bucket 52 is slid until its outlet communicates with the discharge hole 51c, the material in the feeding bucket 52 can be discharged.

[0040] In some embodiments, the heating mechanism 3 includes a plurality of heating coils 31, the heating coils 31 covering the sidewall of the injection cavity 21a, and a heat insulation cover 32 is provided above the injection cavity; the heating coils 31 cover the outer wall of the injection cylinder 21 to heat the material in the injection cavity 21a.

[0041] In some embodiments, a base 6 is further included, the top of which is provided with a pair of slide rails 61; the bottom of the support 1 is provided with two pairs of sliding blocks 13, each pair of sliding blocks 13 being slidably disposed on the slide rails 61, so that the support 1 moves closer to / away from the mold; in short, the support 1 is slidably disposed on the top of the base 6 via the slide rails 61 and the sliding blocks 13, and the drive mechanism 4 can move the support 1 closer to / away from the mold, so that the injection nozzle 21b moves closer to / away from the mold inlet, thus completing the injection of material. In the description of the embodiments of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0042] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence unless expressly indicated herein. Therefore, without departing from the teachings of the exemplary embodiments, the first element, component, region, layer, or segment discussed above may be referred to as the second element, component, region, layer, or segment.

[0043] Spatially relative terms, such as “inside,” “outside,” “below,” “below,” “down,” “above,” “up,” etc., may be used herein to describe the relationship between one element or feature illustrated in the figures and another element or feature. In addition to the orientations depicted in the figures, spatially relative terms may be intended to cover different orientations of the device in use or operation. For example, if the device in the figure is flipped, an element described as “below” or “below” other elements or features would be oriented as “above” other elements or features. Thus, the example term “below” can cover both above and below orientations. The device may be oriented in other ways (rotated 90 degrees or in other orientations), and the spatially relative descriptors used herein are interpreted accordingly.

[0044] In the above discussion, unless otherwise stated, when used to describe numerical values, the terms “about,” “approximately,” “basically,” etc., indicate a change of + / - 10% in that value.

[0045] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A pre-plasticizing device, characterized in that, include: Support base (1); The injection mechanism (2) includes an injection chamber (21a) and an injection screw (22). The injection chamber (21a) is located at the front end of the support base (1). An injection nozzle (21b) is provided at the front end of the injection chamber (21a). A feed inlet (21c) is provided on the top wall of the injection chamber (21a). The injection screw (22) is inserted into the injection chamber (21a). The injection screw (22) is adapted to rotate so that the material in the feed inlet (21c) is conveyed to the injection nozzle (21b). A heating mechanism (3) is provided, which covers the side wall of the injection chamber (21a) to heat the material inside the injection chamber (21a); The drive mechanism (4) includes an axial sliding joint (41) and a rotary joint (42). The axial sliding joint (41) is located at the rear end of the support base (1), and the rotary joint (42) is located at the moving end of the axial sliding joint (41). The rotation axis of the rotary joint (42) passes through the axial sliding joint (41) and is connected to the injection screw (22) to drive the injection screw (22) to rotate. When the injection nozzle (21b) is in communication with the mold, the rotary joint (42) is adapted to move forward following the axial moving joint (41) to expel material so that the material is injected from the injection nozzle (21b) into the mold; When the mold is filled with material, the axial moving pair (41) turns to a passive state, and the rotary pair (42) continues to drive the injection screw (22) to rotate, so that the material at the injection nozzle (21b) is pressurized and pushes back the injection screw (22).

2. The pre-plasticizing device as described in claim 1, characterized in that, The injection mechanism (2) also includes a horizontally arranged injection cylinder (21), the injection chamber (21a) is opened inside the injection cylinder (21), the injection nozzle (21b) is arranged at the front end of the injection cylinder (21), and the heating mechanism (3) covers the side wall of the injection cylinder (21). The rear end of the injection cylinder (21) is inserted into the support base (1), and the side wall of the injection cylinder (21) is provided with a flange (21d), which is detachably connected to the support base (1).

3. The pre-plasticizing device as described in claim 1, characterized in that, The axial moving pair (41) includes a pair of hydraulic cylinders (41a), a driven shaft (41b), and a mounting plate (41c). The hydraulic cylinders (41a) are respectively disposed on the side wall of the support base (1), the driven shaft (41b) is slidably disposed at the rear end of the support base (1), the driven shaft (41b) is coaxially disposed with the injection screw (22), the mounting plate (41c) is disposed at the end of the driven shaft (41b), the mounting plate (41c) is connected to the piston rod of the hydraulic cylinder (41a), and the rotary joint (42) is disposed on the side wall of the mounting plate (41c); and, The passive shaft (41b) has a through hole (41d) on its axis, and the output shaft of the rotary joint (42) passes through the through hole (41d) and is connected to the injection screw (22).

4. The pre-plasticizing device as described in claim 3, characterized in that, The support base (1) is hollow inside. The rear end of the support base (1) is open and has an end cap (11). The passive shaft (41b) is slidably mounted on the end cap (11). The support base (1) has a support ring (12). The inserted end of the passive shaft (41b) is integrally provided with a fitting ring (41e). The fitting ring (41e) is clearance-fitted with the support ring (12), and an O-ring is fitted on the fitting ring (41e).

5. The pre-plasticizing device as described in claim 3, characterized in that, The rotary joint (42) includes a servo motor (42a), which is disposed on the side wall of the mounting plate (41c); A connecting shaft (41f) is slidably disposed within the through hole (41d). The front end of the connecting shaft (41f) is connected to the injection screw (22), and the rear end of the connecting shaft (41f) is connected to the output shaft of the servo motor (42a); and, The sidewall of the connecting shaft (41f) is provided with a retaining ring (41g), which is adapted to abut against the end of the passive shaft (41b) to transmit thrust.

6. The pre-plasticizing device as described in claim 5, characterized in that, The front end of the connecting shaft (41f) is provided with a shrinking sleeve (41h), and the rear end of the injection screw (22) is inserted into the shrinking sleeve (41h); and a keyway is provided in the shrinking sleeve (41h), and a key block is provided at the rear end of the injection screw (22), and the key block is locked in the keyway to transmit torque; The rear end of the connecting shaft (41f) is provided with a connecting hole (41i), the output shaft of the servo motor (42a) is inserted into the connecting hole (41i), and the connecting hole (41i) and the output shaft of the servo motor (42a) are connected by a spline to transmit torque.

7. The pre-plasticizing device as described in claim 1, characterized in that, It also includes a feeding mechanism (5), which includes a feeding bracket (51) and a feeding bucket (52); The feeding bracket (51) is set on the top of the support base (1). The feeding bracket (51) has a feeding hole (51a) inside. The feeding hole (51a) is connected to the feeding hole. The feeding bucket (52) is set on the top of the feeding bracket (51). The outlet of the feeding bucket (52) is connected to the feeding hole (51a).

8. The pre-plasticizing device as described in claim 7, characterized in that, The top of the feeding bracket (51) is provided with a support plate (51b). The bottom of the feeding hopper (52) is provided with a fastening plate (52a), which fastens to both sides of the support plate (51b) so that the feeding hopper (52) can be slidably disposed, causing the outlet of the feeding hopper (52) to be misaligned with the feeding hole (51a) to stop feeding; and, The support plate (51b) is provided with a discharge hole (51c), which is adapted to slide the feeding bucket (52) to the discharge hole (51c) to discharge the material.

9. The pre-plasticizing device as described in claim 1, characterized in that, The heating mechanism (3) includes a plurality of heating coils (31), which cover the side wall of the injection cavity (21a), and a heat insulation cover (32) is provided above the injection cavity.

10. The pre-plasticizing device as described in claim 1, characterized in that, It also includes a base (6), on the top of which a pair of slide rails (61) are provided. The bottom of the support base (1) is provided with two pairs of sliding blocks (13), and each pair of sliding blocks (13) is slidably disposed on the slide rail (61) so that the support base (1) moves closer to / away from the mold.

Images