Injection mechanism and injection molding machine

Abstract

The utility model provides an injection mechanism and an injection molding machine, and belongs to the technical field of injection molding. The injection mechanism comprises a glue injection head plate, a glue melting barrel, a material pushing mechanism and an adjusting mechanism, the material pushing mechanism comprises a screw rod, the screw rod is movably connected in the glue melting barrel, the head of the screw rod is conical and located in a nozzle of the glue melting barrel, the adjusting mechanism drives the screw rod to move axially, and the adjusting mechanism is located in the nozzle of the glue melting barrel. A discharging opening is formed in the glue injection head plate and communicated with the glue melting barrel, and a spiral flow groove is formed in the inner wall of the glue injection head plate. The glue injection device has the following effects that the glue injection head plate and the glue melting barrel are isolated through the sleeve so as to block heat transfer on the glue melting barrel, the glue injection head plate is cooled through cooling liquid in the glue injection head plate, the mutual influence of cooling and glue melting is reduced, the screw rod is driven by the adjusting mechanism to move axially, and the glue injection effect is improved. The position of the conical head of the screw rod in the nozzle of the glue melting barrel is adjusted, so that the size of the nozzle is adjusted, and the injection molding effect is adjusted and improved.

Description

Technical Field

[0001] This application relates to the field of injection molding technology, and more specifically, to an injection mechanism and an injection molding machine. Background Technology

[0002] Current injection molding machines primarily use a cooling ring between the molten barrel and the injection head plate. Water circulates within this ring to remove heat from the molten barrel at the discharge port. However, the water essentially carries away heat from the cooling ring first, and then the cooling ring carries away heat from the injection head plate, resulting in a generally poor heat transfer efficiency.

[0003] In response, Chinese patent application number CN202322119391.6 discloses an injection mechanism and an injection molding machine. This solution mainly involves setting a cooling channel directly on the injection head plate, so that the heat emitted by the molten cylinder can be directly transferred to the inner wall of the cooling channel without any obstacles to heat transfer. This results in faster heat transfer and makes it easier for the heat transferred to the injection head plate to be exchanged by the coolant in the cooling channel, thereby improving the cooling effect of the injection mechanism.

[0004] However, in the process of implementing the technical solutions in the embodiments of this application, the inventors of this application discovered that the above-mentioned technology has at least the following technical problems:

[0005] 1. The cooling channel is located inside the injection head plate. Due to the difficulty of processing, the cooling channel is simple and short, resulting in poor cooling effect. In addition, a cooling cover plate is required for maintenance.

[0006] 2. The melting cylinder is in direct contact with the injection head plate. The cooling channel not only carries away the heat from the injection head plate, but also carries away some of the heat from the melting cylinder, resulting in heat loss from the melting cylinder and affecting the melting of the raw materials. Utility Model Content

[0007] To overcome the above deficiencies, this application provides an injection mechanism and an injection molding machine, which aim to improve the problems mentioned in the background art.

[0008] In a first aspect, embodiments of this application provide an injection mechanism, including an injection head plate, a molten glue cylinder, a feeding mechanism, and an adjusting mechanism. The feeding mechanism includes a spiral rod, which is movably connected within the molten glue cylinder. The head of the spiral rod is conical and located within the nozzle of the molten glue cylinder. The adjusting mechanism drives the spiral rod to move axially. The injection head plate has a discharge port communicating with the molten glue cylinder. The inner wall of the injection head plate has a spiral flow groove. A sleeve is inserted into the inner wall of the injection head plate, and the molten glue cylinder is inserted into the inner wall of the sleeve.

[0009] In one specific implementation, a feed pipe is inserted into the discharge port, the feed pipe is connected to the flange of the injection head plate, and the lower end face of the feed pipe abuts against the injection head plate.

[0010] In the above process, the feed pipe helps to weaken the temperature transfer between the raw material and the injection head plate, and reduce the temperature loss of the raw material.

[0011] In one specific implementation, the lower end of the injection head plate is provided with an interface, and the two interfaces are respectively connected to both ends of the flow channel.

[0012] In the above implementation process, two external cooling water circulators are connected to the two interfaces to inject cooling water into the spiral flow channel.

[0013] In one specific implementation, the feeding mechanism further includes an extrusion motor and a drive rod. The extrusion motor is connected to the rear flange of the injection head plate, the output end of the extrusion motor is poweredly connected to the drive rod, and the drive rod is fixedly connected to the auger rod.

[0014] In the above process, the extrusion motor drives the drive rod, which in turn drives the screw to rotate, thereby extruding the molten raw material. The extrusion motor uses servo control to control the extrusion of the raw material by controlling the speed and direction of rotation of the screw. The drive rod is made of ceramic matrix composite material with low thermal conductivity to reduce the heat on the screw from being transmitted through the drive rod.

[0015] In one specific implementation, a flat key is provided on the drive rod, and the extrusion motor is a hollow shaft with a groove on the inner wall of the hollow shaft that is adapted to the flat key.

[0016] In the above process, the drive rod passes through the hollow output shaft, is circumferentially fixed by a flat key to achieve torque transmission, and can move along the slide to achieve axial movement, thereby adjusting the size of the nozzle.

[0017] In one specific implementation, the adjusting mechanism includes a base, a screw sleeve, and a screw block. The base is fixedly connected to the housing of the extrusion motor, the screw sleeve is rotatably connected to the base, the screw block is rotatably connected to the tail end of the drive rod, the screw block is threadedly connected to the inner wall of the screw sleeve, a guide rod is fixedly connected to the base, and the screw block is slidably connected to the guide rod.

[0018] In the above implementation process, the screw block is constrained on the guide rod, and the rotating screw sleeve can drive the screw to move axially, while the screw block is not affected by the rotation of the drive rod.

[0019] In one specific implementation, the adjusting mechanism further includes an adjusting motor, a worm gear, and a worm. The adjusting motor is mounted on the base, the worm is fixedly connected to the output end of the adjusting motor, the worm gear is fixedly connected to the screw sleeve, and the worm meshes with the worm gear.

[0020] In the above process, the regulating motor drives the screw sleeve to rotate through the transmission of the worm and worm wheel. The worm and worm wheel, as well as the screw sleeve and screw block, all have a self-locking effect, which can support the reaction force when the screw is extruded.

[0021] Secondly, this application also provides an injection molding machine, including the aforementioned injection mechanism.

[0022] Compared with the prior art, the beneficial effects of this application are: using a sleeve to isolate the injection head plate from the melt cylinder to block heat transfer on the melt cylinder, and the injection head plate to use internal coolant to cool down, reducing the mutual influence between cooling and melting. By adjusting the mechanism to drive the axial movement of the screw rod, the position of the conical head of the screw rod in the nozzle of the melt cylinder is adjusted, thereby adjusting the nozzle size to improve the injection molding effect. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the injection mechanism from an external perspective, provided in the embodiments of this application.

[0025] Figure 2 A cross-sectional view of the injection mechanism provided for an embodiment of this application;

[0026] Figure 3 An exploded schematic diagram illustrating the connection and shutdown of the melt cylinder and the injection head plate provided in an embodiment of this application;

[0027] Figure 4 A schematic diagram illustrating the connection between the adjustment mechanism and the drive rod provided in the embodiments of this application.

[0028] In the diagram: 10-Injection head plate; 20-Melting cylinder; 30-Pushing mechanism; 31-Screw rod; 32-Extrusion motor; 33-Drive rod; 34-Flat key; 40-Adjusting mechanism; 41-Base; 42-Screw sleeve; 43-Screw block; 44-Guide rod; 45-Adjusting motor; 46-Worm gear; 47-Worm; 50-Sleeve; 60-Flow channel; 70-Feeding pipe; 80-Interface. Detailed Implementation

[0029] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings.

[0030] Please see Figures 1-4This application provides an injection mechanism, including an injection head plate 10, a molten glue cylinder 20, a feeding mechanism 30, and an adjusting mechanism 40. The feeding mechanism 30 includes a spiral rod 31, which is movably connected inside the molten glue cylinder 20. The head of the spiral rod 31 is conical and located inside the nozzle of the molten glue cylinder 20. The adjusting mechanism 40 drives the spiral rod 31 to move axially. The injection head plate 10 has a discharge port that communicates with the molten glue cylinder 20. The inner wall of the injection head plate 10 has a spiral flow groove 60. A sleeve 50 is inserted into the inner wall of the injection head plate 10, and the molten glue cylinder 20 is inserted into the inner wall of the sleeve 50. In this process, a sleeve is used to isolate the injection head plate 10 from the melt cylinder 20 to block heat transfer on the melt cylinder 20. The injection head plate 10 then uses internal coolant to cool down, reducing the mutual influence between cooling and melting. The adjusting mechanism 40 drives the auger 31 to move axially, thereby adjusting the position of the conical head of the auger 31 in the nozzle of the melt cylinder 20, thus adjusting the nozzle size to improve the injection molding effect.

[0031] Please see Figures 1-4 A feed pipe 70 is inserted into the feed port, and the feed pipe 70 is connected to the flange of the injection head plate 10. The lower end face of the feed pipe 70 abuts against the injection head plate 10. The feed pipe 70 helps to weaken the temperature transfer between the raw material and the injection head plate 10, and reduce the temperature loss of the raw material.

[0032] Please see Figures 1-4 The injection head plate 10 has two interfaces 80 at its lower end, which are connected to both ends of the flow channel 60. The two interfaces 80 are connected to a cooling water circulator to inject cooling water into the spiral flow channel 60.

[0033] Please see Figures 1-4 The feeding mechanism 30 also includes an extrusion motor 32 and a drive rod 33. The extrusion motor 32 is connected to the rear flange of the injection head plate 10, and the output end of the extrusion motor 32 is poweredly connected to the drive rod 33. The drive rod 33 is fixedly connected to the screw rod 31. The extrusion motor 32 drives the drive rod 33, which in turn drives the screw rod 31 to rotate, thereby extruding the molten raw material. The extrusion motor 32 uses servo control to control the extrusion of the raw material by controlling the speed and direction of rotation of the screw rod 31. The drive rod 33 uses a ceramic matrix composite material with low thermal conductivity to reduce the heat on the screw rod 31 that is transmitted through the drive rod 33.

[0034] Please see Figures 1-4 The drive rod 33 is equipped with a flat key 34, and the extrusion motor 32 is a hollow shaft with a groove on the inner wall that matches the flat key 34. The drive rod 33 passes through the hollow output shaft and is circumferentially fixed by the flat key 34 to transmit torque. It can also move along the groove to move axially, thereby adjusting the size of the nozzle.

[0035] Please see Figures 1-4 The adjusting mechanism 40 includes a base 41, a screw sleeve 42, and a screw block 43. The base 41 is fixedly connected to the housing of the extrusion motor 32. The screw sleeve 42 is rotatably connected to the base 41. The screw block 43 is rotatably connected to the tail end of the drive rod 33. The screw block 43 is threadedly connected to the inner wall of the screw sleeve 42. A guide rod 44 is fixedly connected to the base 41, and the screw block 43 is slidably connected to the guide rod 44. The screw block 43 is constrained on the guide rod 44. Rotating the screw sleeve 42 can drive the screw to move axially, while the screw block 43 is not affected by the rotation of the drive rod 33.

[0036] Please see Figures 1-4 The adjusting mechanism 40 also includes an adjusting motor 45, a worm gear 46, and a worm 47. The adjusting motor 45 is mounted on the base 41. The worm 47 is fixedly connected to the output end of the adjusting motor 45. The worm gear 46 is fixedly connected to the screw sleeve 42, and the worm 47 meshes with the worm gear 46. The adjusting motor 45 drives the screw sleeve 42 to rotate through the transmission of the worm 47 and the worm gear 46. The worm 47, the worm gear 46, the screw sleeve 42, and the screw block 43 all have a self-locking effect, which can support the reaction force of the screw rod 31 during extrusion.

[0037] Please see Figures 1-4 This application also provides an injection molding machine, including the above-described injection mechanism.

[0038] The working principle of this injection mechanism is as follows: A sleeve is fitted onto the tail end of the melt cylinder 20. The sleeve is made of ceramic matrix composite material to block heat transfer from the melt cylinder 20. It is then inserted into the injection head plate 10. The sleeve adheres to the inner wall of the injection head plate 10, sealing the side wall of the flow channel 60 to form a spiral flow channel. Two ports 80 are connected to external cooling water circulators, injecting cooling water into the spiral flow channel 60 to provide cooling for the injection head plate 10. The heating mechanism around the melt cylinder 20 heats the melt cylinder 20 to melt the raw material. The extrusion motor 32 drives the drive rod 33, which in turn drives the spiral rod 31 to rotate, thereby extruding the molten raw material. The regulating motor 45 adjusts the worm gear 47. The worm gear 46 drives the screw sleeve 42 to rotate, which in turn drives the screw block 43, drive rod 33, and screw rod 31 to move axially. Adjusting the gap between the cone head of the screw rod 31 and the nozzle adjusts the nozzle size, thus improving the injection molding effect. In summary, the sleeve is used to isolate the injection head plate 10 from the melt cylinder 20 to block the heat transfer on the melt cylinder 20. The injection head plate 10 then uses internal coolant to cool down, reducing the mutual influence between cooling and melting. The adjusting mechanism 40 drives the screw rod 31 to move axially, thereby adjusting the position of the cone head of the screw rod 31 in the nozzle of the melt cylinder 20, thus adjusting the nozzle size to improve the injection molding effect.

[0039] The above are merely embodiments of this application and are not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application. It should be noted that similar reference numerals 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.

Claims

1. An injection mechanism, characterized in that, The device includes a glue injection head plate (10), a melting cylinder (20), a feeding mechanism (30), and an adjusting mechanism (40). The feeding mechanism (30) includes a spiral rod (31), which is movably connected inside the melting cylinder (20). The head of the spiral rod (31) is conical and located inside the nozzle of the melting cylinder (20). The adjusting mechanism (40) drives the spiral rod (31) to move axially. The glue injection head plate (10) has a discharge port that communicates with the melting cylinder (20). The inner wall of the glue injection head plate (10) has a spiral flow groove (60). A sleeve (50) is inserted into the inner wall of the glue injection head plate (10), and the melting cylinder (20) is inserted into the inner wall of the sleeve (50).

2. The injection mechanism according to claim 1, characterized in that, A feeding pipe (70) is inserted into the feeding port. The feeding pipe (70) is connected to the flange of the injection head plate (10). The lower end face of the feeding pipe (70) abuts against the injection head plate (10).

3. The injection mechanism according to claim 2, characterized in that, The lower end of the injection head plate (10) is provided with an interface (80), and the two interfaces (80) are respectively connected to the two ends of the flow channel (60).

4. The injection mechanism according to claim 3, characterized in that, The feeding mechanism (30) also includes an extrusion motor (32) and a drive rod (33). The extrusion motor (32) is connected to the rear flange of the injection head plate (10). The output end of the extrusion motor (32) is poweredly connected to the drive rod (33). The drive rod (33) is fixedly connected to the screw rod (31).

5. An injection mechanism according to claim 4, characterized in that, The drive rod (33) is provided with a flat key (34), and the extrusion motor (32) is a hollow shaft with a groove on the inner wall of the hollow shaft that is compatible with the flat key (34).

6. An injection mechanism according to claim 5, characterized in that, The adjustment mechanism (40) includes a base (41), a screw sleeve (42), and a screw block (43). The base (41) is fixedly connected to the housing of the extrusion motor (32). The screw sleeve (42) is rotatably connected to the base (41). The screw block (43) is rotatably connected to the tail end of the drive rod (33). The screw block (43) is threadedly connected to the inner wall of the screw sleeve (42). A guide rod (44) is fixedly connected to the base (41). The screw block (43) is slidably connected to the guide rod (44).

7. An injection mechanism according to claim 6, characterized in that, The adjustment mechanism (40) further includes an adjustment motor (45), a worm gear (46), and a worm (47). The adjustment motor (45) is mounted on the base (41). The worm (47) is fixedly connected to the output end of the adjustment motor (45). The worm gear (46) is fixedly connected to the screw sleeve (42). The worm (47) meshes with the worm gear (46).

8. An injection molding machine, characterized in that, Includes the injection mechanism as described in any one of claims 1-7.

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