Plunger type injection molding machine capable of automatically demolding

Abstract

The invention discloses an automatic demolding plunger type injection molding machine, which comprises a mounting rack, a plunger type injection mechanism, a molding mechanism and a demolding mechanism, the molding mechanism comprises a first mold body and a second mold body which are oppositely arranged, the demolding mechanism comprises an ejection assembly, the ejection assembly comprises two ejection rods, the two ejection rods are both arranged on the second mold body in a penetrating manner, and the first mold body and the second mold body are oppositely arranged. The demolding mechanism comprises a first mold body, a second mold body and two ejector rods, the ends, away from the first mold body, of the two ejector rods extend out of the second mold body in the direction away from the first mold body, and elastic pieces used for resetting the ejector rods are arranged on the two ejector rods correspondingly; the first driving part is arranged on the second die body and can move along with the second die body, and the second driving part is arranged on the mounting frame. The invention aims to solve the technical problem of difficult demolding caused by adhesion of a demolding head and an injection molding part due to surface defects of the demolding head.

Description

Technical Field

[0001] The invention belongs to the technical field of injection molding machines, and in particular relates to a plunger type injection molding machine capable of automatic demoulding. Background Art

[0002] The plunger injection molding machine is an important injection molding equipment. The working principle of the plunger injection molding machine is to push the plunger to reciprocate through the hydraulic mechanism. When the plunger moves forward, the plastic raw material is heated through the barrel and injected into the mold cavity. When the plunger moves backward, the plastic raw material in the silo is drawn into the barrel for the next injection molding work.

[0003] The existing plunger injection molding machine has an ejection mechanism designed for automatic demoulding. Its main principle is to drive the connecting rod into the mold cavity through power to enable the demoulding head to move into the mold cavity. During the movement of the demoulding head into the mold cavity, the injection molded part is gradually ejected from the cavity, thereby completing the demoulding.

[0004] However, when the ejection mechanism is in operation, the ejection head and the injection molded part may be adhered together due to surface defects such as gouges, notches, scars, and depressions on the surface of the ejection head, making demoulding difficult after ejection.

[0005] In order to solve the above problems, high-precision processing technology can be used to ensure the surface finish and smoothness of the demoulding head. However, this method has high processing requirements for the demoulding head, which is difficult to process and has high production costs. In addition, the demoulding head can also be regularly maintained and serviced to repair surface defects in a timely manner. However, this method will affect production progress and reduce production efficiency. Summary of the invention

[0006] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a plunger-type injection molding machine capable of automatic demoulding, so as to solve the technical problem that the demoulding head and the injection molded part adhere to each other due to surface defects of the demoulding head, resulting in demoulding difficulties.

[0007] To achieve the above-mentioned invention object, the technical solution adopted by the present invention includes: a plunger-type injection molding machine capable of automatic demoulding, comprising a mounting frame, a plunger-type injection mechanism and a molding mechanism, wherein the molding mechanism comprises a first mold body and a second mold body arranged opposite to each other, the first mold body is fixed to the mounting frame, the second mold body is movably arranged on the mounting frame, a first molding part and a second molding part are respectively arranged on opposite sides of the first mold body and the second mold body, after the first molding part and the second molding part are assembled, there is a molding cavity inside thereof for filling with plastic liquid, and the plunger-type injection molding machine also includes a demoulding mechanism; The demoulding mechanism comprises an ejection assembly, wherein the ejection assembly comprises two ejector rods, both of which are arranged on the second mold body, and one end of the two ejector rods close to the first mold body is located in the molding cavity, and one end of the two ejector rods away from the first mold body extends out of the second mold body in a direction away from the first mold body, and both of the two ejector rods are provided with elastic members for resetting the ejector rods, and when the elastic members are in a natural state, the end faces of the two ejector rods are in the same plane with the molding surface of the molding cavity; The demoulding mechanism also includes a pushing component, which includes a first driving part and a second driving part. The first driving part is arranged on the second mold body and can move with the second mold body. The second driving part is arranged on the mounting frame. When the elastic member is in a natural state, there is a first distance between the second driving part and the ejector rod. By driving the second mold body to move in a direction away from the first mold body, after the ejector rod moves the first distance, the two ejector rods can be moved in the direction of the first mold body under the limiting action of the second driving part so that the injection molded part is ejected a second distance. After the injection molded part is ejected the second distance, the second mold body continues to move in the direction away from the first mold body so that the first driving part can drive the second driving part to operate. The operation of the second driving part will change the ejection lengths of the two ejector rods so that the ejection lengths of the two ejector rods are inconsistent.

[0008] Compared with the prior art, the advantages of the present invention include: (1) The present invention provides a plunger-type injection molding machine capable of automatic demoulding. When the elastic member is in a natural state, there is a first distance between the second driving part and the ejector pin. The first distance enables the second driving part to abut against the ejector pin only after the second mold body moves a certain distance. With this design, the second mold body can be demoulded only after it moves the first distance. The first distance of movement will form a certain demoulding space between the first mold body and the second mold body, thereby facilitating the demoulding work. (2) The plunger-type injection molding machine capable of automatic demoulding provided by the present invention can, during the process of the second mold body moving away from the first mold body, push the molded part out of the molding cavity by a certain distance (i.e., the second distance, which should not be less than the depth of the molded part) through the second driving unit, thereby pushing the molded part away from the first mold body. If there is no adhesion between the end surface of the ejector pin and the molded part, automatic demoulding can be achieved, with a high degree of automation and simple demoulding operation. (3) The present invention provides a plunger-type injection molding machine capable of automatic demolding. During the process of the second mold body moving away from the first mold body, the first driving unit drives the second driving unit to operate so that the ejection lengths of the two ejector pins change, that is, the ejection lengths of the two ejector pins are inconsistent, and the two ejector pins are offset near one end of the first mold body. When there is adhesion between the end faces of the ejector pins and the injection molded part, the two offset ejector pins can separate the injection molded part from the ejector pins, and during the separation process, the injection molded part can have a tendency to flip. After separation, the injection molded part is more likely to flip. When the injection molded part falls onto the ejector pin under the influence of gravity, the flipping movement reduces the possibility of the injection molded part hanging on the ejector pin, thereby reducing the process of cleaning the injection molded part hanging on the ejector pin by the staff, thereby reducing the workload of the staff; (4) The present invention provides a plunger-type injection molding machine capable of automatic demoulding, wherein the demoulding mechanism is linked with the second mold body, and automatic demoulding can be achieved during the separation process of the second mold body from the first mold body, with a high degree of automation; (5) The plunger-type injection molding machine with automatic demoulding provided by the present invention does not need to use high-precision processing technology for injection molded parts with low requirements on surface roughness. The surface finish and smoothness of the demoulding head can solve the technical problem that surface defects such as gouges, notches, scratches, and depressions on the surface of the demoulding head will cause the demoulding head to adhere to the injection molded parts and cause demoulding difficulties. The processing requirements for the demoulding head are reduced, the processing is relatively simple, and the production cost is relatively low. In addition, there is no need to regularly maintain and service the demoulding head to repair surface defects, thereby improving production efficiency.

[0009] Furthermore, the two ejector rods are respectively a first rod body and a second rod body, the first rod body is located above the second rod body, and through the second driving component, the distance that the first rod body ejects the injection molded part is greater than the distance that the second rod body ejects the injection molded part.

[0010] Furthermore, a first elastic structure is disposed at one end of the first rod body close to the first mold body, and a second elastic structure is disposed at one end of the second rod body close to the first mold body. The elastic compression range of the first elastic structure is greater than that of the second elastic structure.

[0011] In the present invention: (1) The first elastic mechanism and the second elastic mechanism can provide buffer protection when the first rod body and the second rod body eject the injection molded part; (2) Since the elastic compression range of the first elastic structure is greater than that of the second elastic structure, the elastic force provided by the first rod is greater when the first rod and the second rod move synchronously. In the process of the first rod and the second rod ejecting the injection molded part, due to the friction resistance between the injection molded part and the molding cavity, the first elastic structure and the second elastic structure will be elastically compressed. When the first rod and the second rod just eject the injection molded part from the molding cavity, the moving distances of the first rod and the second rod are the same. Therefore, the elastic compression of the first elastic structure is greater than that of the second elastic structure, and the elastic force provided is also greater. Therefore, when the first rod and the second rod are separated from the injection molded part, the driving force for the injection molded part to flip is further enhanced, and the possibility of the injection molded part hanging on the first rod and the second rod is further reduced.

[0012] Furthermore, the plunger injection molding machine also includes a transmission mechanism, which has a power output shaft, and a one-way transmission component is provided on the power output shaft. A transmission member is provided on the second mold body. When the second mold body moves away from or close to the first mold body, the one-way transmission component is driven to rotate unidirectionally under the transmission action of the transmission member to make the transmission mechanism move unidirectionally.

[0013] In the present invention: (1) Through the transmission parts and the one-way transmission assembly, the movement of the second mold body is linked with the transmission mechanism to achieve intermittent one-way transportation of the injection molded parts, with a high degree of automation; (2) The intermittent one-way conveying of injection molded parts can not only continuously convey the injection molded parts, but also provide a dwell time during the conveying of the injection molded parts, so that the injection molded parts can have sufficient cooling time on the conveying mechanism, and the subsequent workers will not be burned when performing burr removal, edge trimming and other work; (3) Intermittent conveying will not cause the injection molded parts to accumulate at the output port of the transmission mechanism, which reduces the difficulty of cleaning caused by accumulation at the output port of the transmission mechanism, and also provides sufficient time for the staff to handle the subsequent burrs and trimming work better.

[0014] Further, the first driving part includes a rotating disk rotatably arranged on the mounting frame, and a first platform and a first inclined surface are respectively arranged on the side of the rotating disk facing the second mold body, the plane of the first platform is perpendicular to the horizontal plane, one end of the first inclined surface is smoothly connected to the first platform, and the other end extends toward the direction close to the second mold body, and the first inclined surface and the first platform are combined to form a first track for the movement of the first rod body; The rotating disk is provided with a second platform and a second inclined surface on one side facing the second mold body, the plane of the second platform is perpendicular to the horizontal plane, one end of the second inclined surface is smoothly connected to the second platform, and the other end extends away from the second mold body, and the second inclined surface and the second platform are combined to form a second track for the movement of the second rod body; The middle part of the rotating disk has a transmission tube with a hollow tubular structure, and the side of the transmission tube close to the second mold body is open, and the transmission tube has a spiral groove inside; The second driving member is a transmission rod arranged on the second mold body, one end of the transmission rod is fixedly connected to the second mold body, and the other end extends into the transmission tube toward the opening direction of the transmission tube. A driving ball is arranged on the transmission rod, and the driving ball is located in the spiral groove. The driving rod moves in the transmission tube, so that the driving ball rotates along the spiral groove to rotate the rotating disk. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 The structure of the embodiment of the present invention is shown in FIG. Figure 1 ; Figure 2 The structure of the embodiment of the present invention is shown in FIG. Figure 2 ; Figure 3 The structure of the embodiment of the present invention is shown in FIG. Figure 3 ; Figure 4 The structure of the embodiment of the present invention is shown in FIG. Figure 4 ; Figure 5 Schematic diagram of the structure of the first driving unit and the second driving unit in an embodiment of the present invention; Figure 6 Schematic diagram of the structure of the first rod body and the second rod body in an embodiment of the present invention; Figure 7 for Figure 1 Schematic diagram of the cross-sectional structure.

[0017] Reference numerals: Mounting frame 1, plunger injection mechanism 2, first mold body 3, second mold body 4, ejector 5, first spring 6, first rod body 7, first part 8, second part 9, second spring 10, second rod body 11, third part 12, fourth part 13, third spring 14, transmission mechanism 15, power output shaft 16, first tube body 17, second tube body 18, first locking tooth 19, second locking tooth 20, gear 21, fourth spring 22, connecting rod 23, rack 24, rotating disk 25, first platform 26, first inclined surface 27, second platform 28, second inclined surface 29, transmission tube 30, spiral groove 31, transmission rod 32, driving ball 33. DETAILED DESCRIPTION

[0018] In view of the deficiencies in the prior art, the inventor of this case has proposed the technical solution of the present invention after long-term research and extensive practice. The following will further explain the technical solution, its implementation process and principle, etc. in conjunction with the drawings in the embodiments of this application and specific implementation cases.

[0019] It should be noted that the embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention. The described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, the present invention covers any substitution, modification, equivalent method and scheme made on the spirit, principle and scope of the present invention defined by the claims. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] In the description of the present application, "first", "second", "third" and similar words do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, "one" or "an" and other similar words do not indicate a quantity limitation, but indicate the existence of at least one. "Include" or "comprise" and other similar words mean that the elements or objects appearing before "include" or "comprises" include the elements or objects listed after "include" or "comprises" and their equivalents, and do not exclude other elements or objects. "Connect" or "connected" and other similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0021] In the description of the present application, the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, when positional terms such as both sides, outside, up and down are used, it should be understood that they are only used to facilitate understanding and description, considering that the structure may be facing other positions.

[0022] In the description of this application, unless otherwise clearly specified and limited, the technical or scientific terms used should have the usual meanings understood by persons with general skills in the field to which this application belongs. Terms such as "install", "connect", and "connect" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, a conflicting connection, or an integrated connection. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0023] See also Figure 1 , 2 , 3 or 4, the present invention provides a technical solution: a plunger injection molding machine capable of automatic demoulding, comprising a mounting frame 1, a plunger injection mechanism 2 and a molding mechanism, wherein the mounting frame 1 is the supporting structure of the entire injection molding machine, and is used to fix and support all other components, and the mounting frame 1 is usually made of a solid material (such as steel), and has sufficient strength and rigidity to withstand the pressure and vibration generated during the injection molding process. The plunger injection mechanism 2 is responsible for injecting the molten plastic material into the molding cavity. The molding mechanism comprises a first mold body 3 and a second mold body 4 arranged opposite to each other, wherein the first mold body 3 is fixed to the mounting frame 1, and the second mold body 4 is movably arranged on the mounting frame 1, and the first mold body 3 and the second mold body 4 are respectively provided with a first molding part and a second molding part on opposite sides, and after the first molding part and the second molding part are assembled, there is a molding cavity for filling with plastic liquid inside. When the second mold body 4 moves to the first mold body 3 and closes, the molding cavity between them is connected to the plunger injection mechanism 2, thereby allowing the plastic material to be injected therein.

[0024] The plunger injection molding machine also includes a demoulding mechanism, which is responsible for ejecting the injection molded part from the molding cavity after the injection molding process is completed. The demoulding mechanism includes an ejection assembly, which includes two ejector pins 5, both of which are inserted into the second mold body 4, and the two ejector pins 5 are located in the molding cavity at one end close to the first mold body 3, and extend out of the second mold body 4 in a direction away from the first mold body 3 at one end away from the first mold body 3. By moving the ejector pins 5, the position of the ejector pins 5 on the second mold body 4 can be changed. Figure 1Before the injection molding operation, the end surface of the ejector pin 5 close to the molding cavity is in the same plane as the molding surface of the molding cavity to ensure that the injection molded part can evenly fill the molding cavity. Figure 2 Or 3, when the injection molding is completed and the demoulding operation is performed, the end surface of the ejector pin 5 close to the molding cavity will push out of the molding surface for a certain distance, and the injection molded part will be ejected from the molding cavity.

[0025] See also Figure 1 , 2 , 3 or 4, both of the two ejector pins 5 are provided with elastic members for resetting the ejector pins 5, and when the elastic members are in a natural state, the end faces of the two ejector pins 5 are in the same plane with the molding surface of the molding cavity. It should be noted that the elastic member being in a natural state here means that the elastic member is in a stress-free state, and when the elastic member is in a stress-free state, the end face of the ejector pin 5 is in the same plane with the molding surface of the molding cavity, and after the ejector pin 5 is ejected by an external force, the elastic member will be elastically stressed, and after the external force is removed, the ejector pin 5 will elastically recover under the elastic force of the elastic member. Specifically, the elastic member is a first spring 6, and the first spring 6 is sleeved outside the ejector pin 5, and one end of the first spring 6 is fixedly connected to the ejector pin 5, and the other end is fixedly connected to the second mold body 4. Of course, other elastic structures with a reset function known to those skilled in the art are also applicable to the present invention.

[0026] The demoulding mechanism also includes a pushing assembly, which includes a first driving part and a second driving part. The first driving part is arranged on the second mold body 4 and can move with the second mold body 4. During the demoulding process, the first driving part plays a role in transmitting and converting movement, converting the movement of the second mold body 4 into driving the second driving part. The second driving part is arranged on the mounting frame 1. When the elastic member is in a natural state, there is a first distance between the second driving part and the ejector 5. The first distance enables the second driving part to abut against the ejector 5 only after the second mold body 4 moves a certain distance.

[0027] When the second mold body 4 moves away from the first mold body 3, the ejector rod 5 has three different motion processes: See also Figure 1 In the first movement process, the ejector rod 5 moves a first distance along with the first mold body 3, and abuts against the second driving part after moving the first distance.

[0028] See also Figure 2 and 3 In the second movement process, the second mold body 4 is continuously moved, so that the two ejector rods 5 move toward the first mold body 3 under the limiting action of the second driving part, thereby ejecting the injection molded part a certain distance (i.e., the second distance). It should be noted that the second distance should not be less than the depth of the injection molded part, so that the injection molded part can be completely separated from the molding cavity.

[0029] See also Figure 4In the third movement process, the second mold body 4 continues to move away from the first mold body 3. At this time, the first driving part interacts with the second driving part, causing the second driving part to operate. The operation of the second driving part will change the ejection lengths of the two ejector pins 5, so that the ejection lengths of the two ejector pins 5 are inconsistent.

[0030] It should be noted that the operation of the second driving unit will cause the ejection lengths of the two ejector pins 5 to change, so that the ejection lengths of the two ejector pins 5 are inconsistent. There are the following situations: ① The second driving unit drives one of the ejector pins 5 to operate so that it continues to eject the molding cavity, and the position of the other ejector pin 5 does not change; ②, the second driving unit drives one of the ejector pins 5 to operate and return it to the molding cavity, while the position of the other ejector pin 5 does not change; ③. The second driving unit drives two of the ejector pins 5 to operate, wherein one of the ejector pins 5 continues to eject from the molding cavity, and the other ejector pin 5 retracts into the molding cavity; ④. The second driving unit drives two of the ejector pins 5 to operate, and the two ejector pins 5 continue to eject the molding cavity, but the ejection distances are inconsistent; ⑤. The second driving unit drives two of the ejector pins 5 to operate, and both ejector pins 5 are retracted into the molding cavity, but the retraction distances are inconsistent.

[0031] The above-mentioned methods can all realize that the operation of the second driving unit will change the ejection lengths of the two ejector rods 5 so that the ejection lengths of the two ejector rods 5 are inconsistent. Therefore, the above-mentioned methods should all be within the protection scope of the present invention.

[0032] See also Figure 4 In this embodiment, the two ejector rods 5 are respectively a first rod body 7 and a second rod body 11, the first rod body 7 is located above the second rod body 11, and through the second driving component, the distance that the first rod body 7 ejects the injection molded part is greater than the distance that the second rod body 11 ejects the injection molded part.

[0033] By arranging the first rod body 7 above the second rod body 11, and the distance that the first rod body 7 ejects the injection molded part is greater than the distance that the second rod body 11 ejects the injection molded part, when the first ejector rod 5 and the second ejector rod 5 eject the injection molded part (when the first rod body 7 and the second rod body 11 are adhered to the injection molded part), the upper end of the injection molded part can be flipped along the vertical plane toward the first mold body 3, and the upper end of the flipped injection molded part gradually moves away from the end of the first rod body 7, so that the injection molded part is not easy to hang on the first rod body 7. Since the distance that the first rod body 7 ejects the injection molded part is greater than the distance that the second rod body 11 ejects the injection molded part, the injection molded part is even less likely to hang on the second rod body 11.

[0034] See also Figure 6In this embodiment: the first rod 7 is provided with a first elastic structure at one end close to the first mold body 3, and the second rod 11 is provided with a second elastic structure at one end close to the first mold body 3, and the elastic compression range of the first elastic structure is greater than that of the second elastic structure.

[0035] The first elastic mechanism and the second elastic mechanism can provide buffer protection when the first rod 7 and the second rod 11 eject the injection molded part. In addition, since the elastic compression range of the first elastic structure is greater than that of the second elastic structure, the elastic force provided by the first rod 7 is greater when the first rod 7 and the second rod 11 move synchronously. In the process of the first rod 7 and the second rod 11 ejecting the injection molded part, due to the friction resistance between the injection molded part and the molding cavity, the first elastic structure and the second elastic structure will be elastically compressed, and in the process of the first rod 7 and the second rod 11 ejecting the injection molded part from the molding cavity, due to the limitation of the molding cavity, the first rod 7 and the second rod 11 move synchronously, so that when the first rod 7 and the second rod 11 just eject the injection molded part from the molding cavity, the moving distances of the first rod 7 and the second rod 11 are the same, so the elastic compression of the first elastic structure is greater than that of the second elastic structure, and the elastic force provided is also greater, and then when the first rod 7 and the second rod 11 are separated from the injection molded part, the driving force for the injection molded part to flip is further increased, and the possibility of the injection molded part hanging on the first rod 7 and the second rod 11 is further reduced.

[0036] Specifically, the first rod body 7 includes a first part 8 and a second part 9, the first part 8 is close to the molding cavity, the second part 9 is inserted into the first part 8 relative to one end of the first part 8, and the elastic structure is arranged between the first part 8 and the second part 9. Furthermore, the first elastic structure is a second spring 10, one end of the second spring 10 is connected to one end of the first part 8 away from the molding cavity, and the other end is connected to one end of the second part 9 close to the molding cavity.

[0037] The second rod body 11 includes a third part 12 and a fourth part 13, the third part 12 is close to the molding cavity, and one end of the third part 12 relative to the fourth part 13 is inserted into the third part 12, and the second elastic structure is arranged between the third part 12 and the fourth part 13. Furthermore, the second elastic structure is a third spring 14, one end of the third spring 14 is connected to an end of the third part 12 away from the molding cavity, and the other end is connected to an end of the fourth part 13 close to the molding cavity.

[0038] Of course, other elastic structures known to those skilled in the art can be applied to the first elastic structure and the second elastic structure in the present invention, such as a cylinder piston and an elastic support method.

[0039] See also Figure 7In this embodiment: the plunger injection molding machine also includes a transmission mechanism 15, the transmission mechanism 15 has a power output shaft 16, the power output shaft 16 has a one-way transmission component, and the second mold body 4 is provided with a transmission member. When the second mold body 4 moves away from or close to the first mold body 3, under the transmission action of the transmission member, the one-way transmission component is driven to rotate unidirectionally to make the transmission mechanism 15 move unidirectionally.

[0040] Specifically, under the transmission action of the transmission member, the one-way transmission assembly is driven to rotate in one direction so that the transmission mechanism 15 can move in one direction. There are the following situations: ①, when the second mold body 4 moves in the direction away from the first mold body 3, the transmission member can interact with the one-way transmission assembly so that the one-way transmission assembly can drive the power output shaft 16 to rotate, so that the transmission mechanism 15 can operate and the injection molded parts that fall off are transported; on the contrary, when the second mold body 4 moves in the direction close to the first mold body 3, the transmission member cannot interact with the one-way transmission assembly to rotate the one-way transmission assembly, and thus cannot drive the power output shaft 16 to rotate, the transmission mechanism 15 does not operate, and the injection molded parts that fall on the transmission mechanism 15 will stay in this process.

[0041] ②. During the movement of the second mold body 4 toward the first mold body 3, the transmission member can interact with the one-way transmission assembly so that the one-way transmission assembly can drive the power output shaft 16 to rotate, so that the transmission mechanism 15 can operate and the injection molded parts that fall off are transported; on the contrary, during the movement of the second mold body 4 toward the direction away from the first mold body 3, the transmission member cannot interact with the one-way transmission assembly to rotate the one-way transmission assembly, and thus cannot drive the power output shaft 16 to rotate, the transmission mechanism 15 does not operate, and the injection molded parts that fall on the transmission mechanism 15 will stay during this process.

[0042] In summary, the above two methods can both realize intermittent one-way conveying of injection molded parts. Intermittent one-way conveying can not only continuously convey injection molded parts, but also have a residence time when conveying injection molded parts, so that the injection molded parts can have sufficient cooling time on the transmission mechanism 15, and the subsequent staff will not be scalded when performing burr removal, edge trimming and other work. In addition, intermittent conveying will not cause the injection molded parts to accumulate at the output port of the transmission mechanism 15, which reduces the cleaning difficulty caused by accumulation at the output port of the transmission mechanism 15, and also provides the staff with sufficient time for subsequent processing, so that the staff can better handle the subsequent burr and edge trimming work.

[0043] Specifically, the one-way transmission assembly includes a first tube body 17 fixedly sleeved on the power output shaft 16 and a second tube body 18 slidably sleeved on the power output shaft 16. The first tube body 17 and the second tube body 18 are both coaxially arranged with the power output shaft 16. The first tube body 17 and the second tube body 18 are respectively provided with mutually meshing first locking teeth 19 and second locking teeth 20 on opposite sides of the first tube body 17 and the second tube body 18. The first locking teeth 19 and the second locking teeth 20 are both inclined. It should be noted that the inclination direction of the first locking teeth 19 and the second locking teeth 20 is adapted to the conveying direction of the transmission mechanism 15. A gear 21 is provided on the side of the second tube body 18 facing away from the first tube body 17. The gear 21 is sleeved on the power output shaft 16 and coaxially arranged with the power output shaft 16. A fourth spring 22 is provided between the gear 21 and the power output shaft 16. The fourth spring 22 is sleeved on the outside of the power output shaft 16. One end of the fourth spring 22 abuts against the side of the gear 21 facing away from the second tube body 18, and the other end is connected to the power output shaft 16.

[0044] The transmission member includes a connecting rod 23, which is fixedly connected to the second mold body 4. The connecting rod 23 is connected to a rack 24, which meshes with the gear 21. During the movement of the second mold body 4, the rack 24 can be driven to move by the connecting rod 23, and the movement of the rack 24 can drive the gear 21 to rotate. In this embodiment, during the movement of the second mold body 4 toward the first mold body 3, the transmission member can act on the one-way transmission assembly, that is, the inclination direction of the first locking tooth 19 is opposite to the rotation direction of the gear 21, and the inclination direction of the second locking tooth 20 is the same as the rotation direction of the gear 21. The movement of the second mold body 4 drives the rack 24 to move through the connecting rod 23, and the movement of the rack 24 can drive the gear 21 to rotate. The rotation of the gear 21 drives the first tube 17 to rotate, and the first locking tooth 19 is opposite to the second locking tooth 20. The movement of the tooth 20 constitutes a limit, so that the rotation of the second tube body 18 can drive the first tube body 17 to rotate, and then drive the power output shaft 16 to rotate, and the fourth spring 22 provides an elastic force to keep the end faces of the first tube body 17 and the second tube body 18 in contact with each other at all times. During the movement of the second mold body 4 away from the first mold body 3, the first locking tooth 19 does not constitute a limit to the movement of the second locking tooth 20, and the second locking tooth 20 moves along the inclined surface of the first locking tooth 19 so that the second locking tooth 20 disengages from the first locking tooth 19, so that the rotation of the second tube body 18 cannot drive the first tube body 17 to rotate, and the fourth spring 22 provides an elastic force to keep the end faces of the first tube body 17 and the second tube body 18 in contact with each other at all times, so that the second locking tooth 20 and the first locking tooth 19 present a disengagement-locking-disengagement cycle.

[0045] See also Figure 1-4In this embodiment: the first driving part includes a rotating disk 25 rotatably arranged on the mounting frame 1, and the first platform 26 and the first inclined surface 27 are respectively arranged on the side of the rotating disk 25 facing the second mold body 4, the plane of the first platform 26 is perpendicular to the horizontal plane, one end of the first inclined surface 27 is smoothly connected to the first platform 26, and the other end extends toward the direction close to the second mold body 4, and the first inclined surface 27 and the first platform 26 are combined to form a first track for the movement of the first rod body 7; The rotating disk 25 is provided with a second platform 28 and a second inclined surface 29 on the side facing the second mold body 4, the plane of the second platform 28 is perpendicular to the horizontal plane, one end of the second inclined surface 29 is smoothly connected to the second platform 28, and the other end extends away from the second mold body 4, and the second inclined surface 29 and the second platform 28 are combined to form a second track for the movement of the second rod body 11; The rotating disk 25 has a transmission tube 30 with a hollow tubular structure in the middle, and the transmission tube 30 is open on the side close to the second mold body 4, and the transmission tube 30 has a spiral groove 31 inside; See also Figure 5 The second driving member is a transmission rod 32 disposed on the second mold body 4. One end of the transmission rod 32 is fixedly connected to the second mold body 4, and the other end extends into the transmission tube 30 toward the open direction of the transmission tube 30. A driving ball 33 is disposed on the transmission rod 32, and the driving ball 33 is located in the spiral groove 31. Figure 5 , the transmission rod 32 moves in the transmission tube 30, so that the driving ball 33 rotates along the spiral groove 31 to rotate the rotating disk 25.

[0046] It should be understood that the transmission rod 32 may also be provided with a spiral groove 31 on the transmission rod 32 and the driving ball 33 may be disposed on the inner wall of the transmission tube 30 to achieve the rotational driving of the rotating disk 25 by the transmission rod 32 .

[0047] When the second mold body 4 moves away from the first mold body 3, the first rod body 7 and the second rod body 11 have three different movement processes: See also Figure 1 In the first movement process, the first rod body 7 and the second rod body 11 move a first distance along with the first mold body 3, and after moving the first distance, they respectively abut against the first platform 26 and the second platform 28 on the rotating disk 25.

[0048] See also Figure 2-3 In the second movement process, continuing to move the second mold body 4 will cause the first rod body 7 and the second rod body 11 to move toward the first mold body 3 under the limiting action of the first platform 26 and the second platform 28 of the rotating disk 25, thereby ejecting the injection molded part a certain distance (i.e., the second distance).

[0049] See also Figure 4-5In the third movement process, the second mold body 4 continues to move away from the first mold body 3. At this time, the driving ball 33 enters the spiral groove 31 and slides along the spiral groove 31, thereby driving the rotating disk 25 to rotate. The rotation of the rotating disk 25 will cause the first rod body 7 to move from the first platform 26 to the first inclined surface 27, and the first rod body 7 continues to be ejected near the end of the first mold body 3. The second rod body 11 moves from the second platform 28 to the second inclined surface 29 under the action of the elastic member, and the second rod body 11 retracts a certain distance near the end of the first mold body 3, thereby making the ejection lengths of the first rod body 7 and the second rod body 11 inconsistent.

[0050] When the second mold body 4 moves toward the first mold body 3 , the first rod body 7 and the second rod body 11 can be restored to their original positions under the joint action of the elastic member, the spiral groove 31 and the driving ball 33 .

[0051] It should be understood that the above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the content of the present invention and implement it accordingly. It cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, some simple deductions or substitutions can be made without departing from the concept of the present invention. All equivalent changes or modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. A plunger-type injection molding machine capable of automatic demoulding, comprising a mounting frame, a plunger-type injection mechanism and a molding mechanism, wherein: The molding mechanism comprises a first mold body and a second mold body which are arranged opposite to each other, the first mold body is fixed to a mounting frame, the second mold body is movably arranged on the mounting frame, the first mold body and the second mold body are respectively provided with a first molding part and a second molding part on opposite sides, and after the first molding part and the second molding part are assembled, there is a molding cavity for filling with plastic liquid inside, characterized in that: the plunger injection molding machine also includes a demoulding mechanism; The demoulding mechanism comprises an ejection assembly, wherein the ejection assembly comprises two ejector rods, both of which are arranged on the second mold body, and one end of the two ejector rods close to the first mold body is located in the molding cavity, and one end of the two ejector rods away from the first mold body extends out of the second mold body in a direction away from the first mold body, and both of the two ejector rods are provided with elastic members for resetting the ejector rods, and when the elastic members are in a natural state, the end faces of the two ejector rods are in the same plane with the molding surface of the molding cavity; The demolding mechanism also includes a pushing component, which includes a first driving part and a second driving part. The first driving part is arranged on the second mold body and can move with the second mold body. The second driving part is arranged on the mounting frame. When the elastic member is in a natural state, there is a first distance between the second driving part and the ejector rod. By driving the second mold body to move in a direction away from the first mold body, after the ejector rod moves the first distance, the two ejector rods can be moved in the direction of the first mold body under the limiting action of the second driving part so that the injection molded part is ejected out of the molding cavity by a second distance. After the injection molded part is ejected out of the molding cavity by the second distance, the second mold body continues to move in the direction away from the first mold body so that the first driving part can drive the second driving part to operate. The operation of the second driving part will change the ejection lengths of the two ejector rods so that the ejection lengths of the two ejector rods are inconsistent.

2. A plunger-type injection molding machine capable of automatic demoulding according to claim 1, characterized in that: The two ejector rods are respectively a first rod body and a second rod body, the first rod body is located above the second rod body, and through the pushing assembly, the distance that the first rod body ejects the injection molded part is greater than the distance that the second rod body ejects the injection molded part.

3. A plunger-type injection molding machine capable of automatic demoulding according to claim 2, characterized in that: A first elastic structure is disposed at one end of the first rod body close to the first mold body, and a second elastic structure is disposed at one end of the second rod body close to the first mold body. The elastic compression range of the first elastic structure is greater than that of the second elastic structure.

4. The plunger-type injection molding machine capable of automatic demoulding according to claim 3, characterized in that: The first driving part comprises a rotating disk rotatably arranged on the mounting frame, and a first platform and a first inclined surface are respectively arranged on the side of the rotating disk facing the second mold body, the plane of the first platform is perpendicular to the horizontal plane, one end of the first inclined surface is smoothly connected to the first platform, and the other end extends toward the direction close to the second mold body, and the first inclined surface and the first platform are combined to form a first track for the movement of the first rod body; The rotating disk is provided with a second platform and a second inclined surface on one side facing the second mold body, the plane of the second platform is perpendicular to the horizontal plane, one end of the second inclined surface is smoothly connected to the second platform, and the other end extends away from the second mold body, and the second inclined surface and the second platform are combined to form a second track for the movement of the second rod body; The middle part of the rotating disk has a transmission tube with a hollow tubular structure, and the side of the transmission tube close to the second mold body is open, and the transmission tube has a spiral groove inside; The second driving member is a transmission rod arranged on the second mold body, one end of the transmission rod is fixedly connected to the second mold body, and the other end extends into the transmission tube toward the opening direction of the transmission tube. A driving ball is arranged on the transmission rod, and the driving ball is located in the spiral groove. The driving rod moves in the transmission tube, so that the driving ball rotates along the spiral groove to rotate the rotating disk.

5. A plunger-type injection molding machine capable of automatic demoulding according to any one of claims 1 to 4, characterized in that: The plunger injection molding machine also includes a transmission mechanism, which has a power output shaft, and a one-way transmission component on the power output shaft. A transmission member is provided on the second mold body. When the second mold body moves away from or close to the first mold body, the one-way transmission component is driven to rotate in one direction under the transmission action of the transmission member to make the transmission mechanism move in one direction.

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