Injection device for injection molding machine and injection molding machine

Abstract

The present application relates to the field of injection molding technology, and discloses an injection device for an injection molding machine, including a barrel, an injection cavity is arranged in the barrel along a first direction, an exhaust hole is arranged in the barrel along a second direction, and the exhaust hole is connected to the injection cavity; a screw, the screw is arranged in the injection cavity along the first direction; an exhaust device, the exhaust device is arranged corresponding to the exhaust hole; wherein the exhaust device includes a main shell, the main shell is provided with an exhaust channel through the second direction, the exhaust channel is respectively provided with a first opening and a second opening on both sides of the main shell along the second direction, and the main shell is connected to the exhaust hole through the first opening; an anti-bursting component, the anti-bursting component is arranged in the exhaust channel to limit the movement of plastic raw materials to the exhaust channel. Provided is an injection device for an injection molding machine and an injection molding machine that can exhaust gas and avoid bursting.

Description

Technical Field

[0001] The present application relates to the field of injection molding technology, and in particular to an injection device for an injection molding machine and an injection molding machine. Background Art

[0002] Screw injection molding machine is the most widely used type of injection molding machine. Screw injection molding machine includes injection device, which is mainly composed of screw and barrel. When the screw injection molding machine is working, generally granular or powdered plastic raw materials are added into the barrel first, and the plastic raw materials are molten by the rotation of the screw in the barrel and the heating of the barrel. Then the plastic raw materials are driven forward by the rotation of the screw, so that the plastic raw materials are ejected from the nozzle at a very high pressure and speed, and injected into the mold, and finally fixed into the desired molded plastic products after pressure maintenance and cooling.

[0003] When the barrel processes the plastic raw materials through the rotation of the screw, it will go through a process of pressurization and decompression. During this process, the moisture and volatile substances in the molten plastic raw materials will be vaporized. In order to prevent the vaporized moisture and volatile substances from being injected into the product along with the plastic raw materials, an exhaust hole will be set on the barrel, and these vaporized moisture and volatile substances will be discharged through the exhaust hole. However, the plastic raw materials will also overflow through the exhaust hole, resulting in the problem of overflowing. Summary of the invention

[0004] The present application mainly solves the technical problem in the prior art that plastic raw materials are discharged from the exhaust hole of the barrel during injection molding.

[0005] In order to solve the above technical problems, the present application provides an injection device for an injection molding machine, which is characterized by comprising:

[0006] A barrel, wherein an injection cavity is arranged in the barrel along a first direction, and an exhaust hole and a feed hole are arranged in the barrel in sequence along the first direction, and the exhaust hole and the feed hole are both connected to the injection cavity;

[0007] a screw, the screw being arranged in the injection cavity along the first direction;

[0008] A feeding cylinder, the feeding cylinder is arranged corresponding to the feeding hole;

[0009] An exhaust device, wherein the exhaust device is arranged corresponding to the exhaust hole; wherein the exhaust device comprises:

[0010] A main shell, wherein an exhaust passage is provided in the main shell along the second direction, and a first opening and a second opening are provided on both sides of the exhaust passage in the main shell along the second direction, respectively, and the main shell is connected with the exhaust hole through the first opening;

[0011] An anti-material-overflow component is arranged in the exhaust channel to limit the movement of plastic raw materials into the exhaust channel; wherein the anti-material-overflow component includes:

[0012] A first anti-material-overflowing structure, the first anti-material-overflowing structure is arranged at the top of the exhaust hole along the second direction, the first anti-material-overflowing structure is arranged in the exhaust channel, the first anti-material-overflowing structure includes a first bracket and a second bracket arranged at intervals on the left and right, an air hole is formed between the first bracket and the second bracket, the air hole forms a projection on the barrel along the second direction, and the projection is completely within the range of the exhaust hole;

[0013] A second anti-bursting structure, the second anti-bursting structure is arranged on the top of the first anti-bursting structure along the second direction, the second anti-bursting structure is arranged in the exhaust channel, the second anti-bursting structure includes a plurality of baffle assemblies arranged in sequence along the second direction, the baffle assemblies include a first baffle and a second baffle arranged at intervals along the second direction, the first ends of the first baffle and the second baffle are connected to the main shell, and the second ends of the first baffle and the second baffle are separated from the main shell to form an S-shaped exhaust channel arranged around the first baffle and the second baffle.

[0014] In one embodiment, the screw is divided into a feeding section, a compression section and a metering section in sequence along the first direction, the exhaust hole is arranged corresponding to the compression section, and the feed hole is arranged corresponding to the feeding section.

[0015] In one embodiment, the first bracket and the second bracket each include a connecting plate and a rotating plate, the connecting plate is transversely arranged in the exhaust passage along a first direction, the first end of the connecting plate is connected to the main shell, and the second end of the connecting plate is rotatably connected to the rotating plate; wherein,

[0016] The exhaust gas in the barrel drives the rotating plate to rotate, and the size of the air hole changes under the rotation connection of the rotating plate; and the pressure of the exhaust gas in the barrel is set in direct proportion to the size of the air hole.

[0017] In one possible implementation manner, the rotating plate is arranged to be inclined toward the second opening.

[0018] In one possible implementation manner, the first bracket and the second bracket are made of metal material, and the first bracket and the second bracket are covered with a heating layer.

[0019] In one embodiment, the projections of the first baffle and the second baffle in the same baffle assembly intersect along the second direction at the bottom of the main shell.

[0020] In one embodiment, the first baffle and the second baffle are located at the bottom of the main shell along the second direction to form a first projection, the air vent is located at the bottom of the main shell along the second direction to form a second projection, and the first projection completely covers the second projection.

[0021] In order to solve the above technical problems, the present application also provides an injection molding machine, characterized in that it includes the injection device for the injection molding machine described in Example 1.

[0022] Compared with the prior art, the injection device for the injection molding machine and the injection molding machine of the present application have the following beneficial effects:

[0023] During specific use, the screw rotates in the barrel to drive the plastic raw material forward in a first direction, and the vaporized moisture and volatile substances are discharged from the exhaust device through the exhaust holes. The anti-material overflow component in the exhaust device keeps the plastic raw material in the barrel and prevents the plastic raw material from moving toward the exhaust channel.

[0024] Therefore, the present application has the characteristics of reasonable structure and convenient use. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Attached Figure 1 It is a structural schematic diagram of an injection device for an injection molding machine of the present application;

[0026] Attached Figure 2 It is a structural schematic diagram of the exhaust device of the present application.

[0027] Description of the numbers in the figure:

[0028] X, first direction; Y, second direction;

[0029] 100. Barrel;

[0030] 110, injection cavity; 120, exhaust hole; 130, feed hole;

[0031] 200, screw;

[0032] 300, exhaust device;

[0033] 310, main housing; 320, exhaust passage; 321, first opening; 322, second opening; 330, anti-material overflow assembly; 331, first anti-material overflow structure; 331-1, first bracket; 331-11, connecting plate; 331-12, rotating plate; 331-2, second bracket; 331-3, air vent; 332, second anti-material overflow structure; 332-1, first baffle; 332-2, second baffle; 333, blocking plate;

[0034] 400. Feed barrel. DETAILED DESCRIPTION

[0035] In order to make the purpose, features, and advantages of the present application more obvious and easy to understand, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0036] The prior art has a technical problem that the plastic raw material is discharged from the exhaust hole of the barrel during injection molding.

[0037] To this end, the present application provides an injection device for an injection molding machine, characterized in that it includes:

[0038] A barrel, wherein an injection cavity is arranged in the barrel along a first direction, and an exhaust hole and a feed hole are arranged in the barrel in sequence along the first direction, and the exhaust hole and the feed hole are both connected to the injection cavity;

[0039] a screw, the screw being arranged in the injection cavity along the first direction;

[0040] A feeding cylinder, the feeding cylinder is arranged corresponding to the feeding hole;

[0041] An exhaust device, wherein the exhaust device is arranged corresponding to the exhaust hole; wherein the exhaust device comprises:

[0042] A main shell, wherein an exhaust passage is provided in the main shell along the second direction, and a first opening and a second opening are provided on both sides of the exhaust passage in the main shell along the second direction, respectively, and the main shell is connected with the exhaust hole through the first opening;

[0043] An anti-material-overflow component is arranged in the exhaust channel to limit the movement of plastic raw materials into the exhaust channel; wherein the anti-material-overflow component includes:

[0044] A first anti-material-overflowing structure, the first anti-material-overflowing structure is arranged at the top of the exhaust hole along the second direction, the first anti-material-overflowing structure is arranged in the exhaust channel, the first anti-material-overflowing structure includes a first bracket and a second bracket arranged at intervals on the left and right, an air hole is formed between the first bracket and the second bracket, the air hole forms a projection on the barrel along the second direction, and the projection is completely within the range of the exhaust hole;

[0045] A second anti-bursting structure, the second anti-bursting structure is arranged on the top of the first anti-bursting structure along the second direction, the second anti-bursting structure is arranged in the exhaust channel, the second anti-bursting structure includes a plurality of baffle assemblies arranged in sequence along the second direction, the baffle assemblies include a first baffle and a second baffle arranged at intervals along the second direction, the first ends of the first baffle and the second baffle are connected to the main shell, and the second ends of the first baffle and the second baffle are separated from the main shell to form an S-shaped exhaust channel arranged around the first baffle and the second baffle.

[0046] The present application also provides an injection molding machine, which includes the injection device for the injection molding machine described in Example 1.

[0047] Embodiment 1:

[0048] Attached Figure 1 This is a schematic diagram of the structure of the injection device for the injection molding machine of this application. Figure 1 As shown, the first direction X in the present application refers to the length direction of the injection device for the injection molding machine, that is, the injection device for the injection molding machine is from left to right or from right to left. The second direction Y in the present application refers to the height direction of the injection device for the injection molding machine, that is, the injection device for the injection molding machine is from top to bottom or from bottom to top. In the injection device for the injection molding machine, the exhaust device 300 is on the top and the barrel 100 is on the bottom.

[0049] Please refer to the attached Figure 1 As shown, the injection device for the injection molding machine in the present application includes a barrel 100, which is a long strip structure and has a circular cross section. An injection cavity 110 is provided in the barrel 100 along the first direction X, and the injection cavity 110 is used to place the screw 200. The outer side of the barrel is wrapped with a right heating device, and the plastic raw material is heated by the heating device, and the plastic raw material is melted in the injection cavity 110, and injected into the injection mold under the rotation of the screw 200. An exhaust hole 120 is provided in the barrel 100 along the second direction Y, and the exhaust hole 120 is connected to the injection cavity 110, and the water and volatile substances vaporized in the injection cavity 110 are discharged from the exhaust hole 120.

[0050] In one embodiment, the cross section of the exhaust hole 120 is circular or square.

[0051] In one embodiment, the diameter of the vent hole 120 is smaller than the diameter of the injection cavity 110 to reduce the possibility of the plastic material being discharged from the vent hole 120 .

[0052] In one embodiment, the injection cavity 110 is an elongated structure, and the cross section of the injection cavity 110 is a circular structure to ensure that the screw 200 can rotate in the injection cavity 110 .

[0053] Please refer to the attached Figure 1 As shown, the injection device for the injection molding machine in the present application includes a screw 200, which is arranged in the injection cavity 110 along the first direction X. The screw 200 pushes the plastic material in the barrel 100 forward by rotating.

[0054] In one embodiment, the axis of the screw 200 is arranged to coincide with the axis of the injection cavity 110 to enhance the reliability of the screw 200 during rotation.

[0055] Please refer to the attached Figure 1 As shown, the injection device for the injection molding machine in the present application includes an exhaust device 300, and the exhaust device 300 is arranged corresponding to the exhaust hole 120. Further, the bottom of the exhaust device 300 is connected to the barrel 100. In one embodiment, the bottom of the exhaust device 300 is fastened to the barrel 100 by welding or bolting. In order to realize that the vaporized moisture and volatile substances are discharged from the exhaust hole 120 through the exhaust device 300, the setting of the exhaust device 300 can prevent the plastic raw material from overflowing through the exhaust hole 120.

[0056] Please refer to the attached Figure 1 As shown, the screw 200 is divided into a feeding section, a compression section and a metering section in sequence along the first direction X, and the two ends of the compression section are connected to the feeding section and the metering section respectively. The exhaust hole 120 is arranged corresponding to the compression section to facilitate the discharge of vaporized moisture and volatile substances. The pressure in the compression section is not as high as that in the metering section, so the plastic raw material is not easy to overflow from the exhaust hole 120.

[0057] The barrel 100 is provided with a feed hole 130 along the second direction Y, the feed hole 130 is connected to the injection cavity 110, and the feed hole 130 is provided corresponding to the feeding section. In one embodiment, the feed hole 130 is connected to the feed barrel 400. The plastic raw material enters the barrel 100 through the feed hole 130 from the feed barrel 400.

[0058] In one embodiment, the feeding tube 400 is a funnel-shaped structure.

[0059] In one embodiment, the exhaust hole 120 and the feed hole 130 are disposed on the barrel 100 at intervals along the first direction.

[0060] Attached Figure 2 This is a schematic diagram of the structure of the exhaust device of this application. Figure 2As shown, the exhaust device 300 includes a main housing 310, and an exhaust channel 320 is provided in the main housing 310 along the second direction Y. The exhaust channel 320 is a discharge channel for vaporized moisture and volatile substances. The exhaust channel 320 is provided with a first opening 321 and a second opening 322 on both sides of the main housing 310 along the second direction Y. The first opening 321 is located at the bottom of the exhaust channel 320, and the main housing 310 is connected to the exhaust hole through the first opening 321. The second opening 322 is located at the top of the exhaust channel 320, and the vaporized moisture and volatile substances in the exhaust channel 320 are discharged to the outside through the second opening 322.

[0061] In one embodiment, the main housing 310 is a rectangular structure, and the main housing 310 and the anti-material component 330 are made of metal materials to prevent high temperature from deforming the exhaust device 300. Furthermore, a heating layer can be installed on the exhaust device 300, and the setting of the heating layer can prevent the molten plastic material from being cold and sticking to the exhaust device 300 when passing through the exhaust device 300.

[0062] In one embodiment, the heating layer is attached to the outer surface of the main shell 310 .

[0063] Please refer to the attached Figure 2 As shown, the exhaust device 300 also includes an anti-material-importing assembly 330, which is arranged in the exhaust channel 320 to limit the movement of the plastic raw material into the exhaust channel 320. Further, the anti-material-importing assembly 330 includes a first anti-material-importing structure 331 and a second anti-material-importing structure 332. The first anti-material-importing structure 331 and the second anti-material-importing structure 332 can be set separately or in combination to prevent the plastic raw material from entering the main housing 310. In the present application, the effect of the combination of the first anti-material-importing structure 331 and the second anti-material-importing structure 332 is better than the separate setting of the first anti-material-importing structure 331 or the second anti-material-importing structure 332.

[0064] Among them, the anti-emission component 330 includes a first anti-emission structure 331, which is arranged at the top of the exhaust hole along the second direction Y. The first anti-emission structure 331 is arranged in the exhaust channel 320 to reduce the exhaust hole while blocking the plastic raw material from entering the main shell 310.

[0065] Furthermore, the first anti-overflow structure 331 includes a first bracket 331-1 and a second bracket 331-2 arranged at intervals on the left and right, and a vent hole 331-3 is formed between the first bracket 331-1 and the second bracket 331-2, and the vaporized water and volatile substances enter the main shell 310 through the vent hole 331-3. The vent hole 331-3 forms a projection on the barrel along the second direction Y, and the projection is completely within the range of the exhaust hole, that is, the vent hole 331-3 and the exhaust hole are arranged correspondingly up and down, so that the vaporized water and volatile substances can enter the vent hole 331-3 through the exhaust hole. And the size of the vent hole 331-3 is smaller than that of the exhaust hole, thereby preventing the plastic raw material from entering the main shell 310.

[0066] In one embodiment, the first bracket 331-1 and the second bracket 331-2 both include a connecting plate 331-11 and a rotating plate 331-12. The connecting plate 331-11 is transversely arranged in the exhaust channel 320 along the first direction X. The first end of the connecting plate 331-11 is connected to the main housing 310, and the second end of the connecting plate 331-11 is connected to the rotating plate 331-12. The exhaust formed by the vaporized moisture and volatile substances in the barrel drives the rotating plate 331-12 to rotate. When the pressure of the exhaust is greater, the angle between the rotating plate 331-12 and the connecting plate 331-11 is greater, and the air vent 331-3 is also larger. That is, the pressure of the exhaust in the barrel is proportional to the size of the air vent 331-3. Therefore, the size of the air vent 331-3 is automatically adjusted according to the size of the exhaust pressure, further meeting the exhaust standard of the injection device for the injection molding machine, and avoiding the situation where the vaporized moisture and volatile substances remain in the barrel. Furthermore, the weight of the rotating plate 331 - 12 or the damping between the rotating plate 331 - 12 and the connecting plate 331 - 11 may be adjusted to adjust the rotation amplitude between the rotating plate 331 - 12 and the connecting plate 331 - 11 .

[0067] In one embodiment, the rotating plate 331-12 is tilted toward the second opening 322 to form a guide for the vaporized moisture and volatile substances, while increasing the contact area between the rotating plate 331-12 and the vaporized moisture and volatile substances. While discharging the vaporized moisture and volatile substances, the plastic will be driven into the exhaust hole 120. However, this part of the plastic raw material will adhere to the rotating plate 331-12 after contacting the rotating plate 331-12, and further fall into the barrel 100 due to its own gravity.

[0068] In one embodiment, the first bracket 331-1 and the second bracket 331-2 are both made of metal material, and the first bracket 331-1 and the second bracket 331-2 are covered with a heating layer. The heating layer heats the first bracket 331-1 and the second bracket 331-2 to prevent the plastic material from solidifying on the first bracket 331-1 or the second bracket 331-2.

[0069] In one embodiment, a blocking plate 333 is provided on the first bracket 331-1 and / or the second bracket 331-2, and the blocking plate 333 is fixedly connected to the connecting plate 331-11 on the first bracket 331-1 and / or the second bracket 331-2, and a rotation space is formed between the blocking plate 333 and the first bracket 331-1 and the second bracket 331-2, and the rotation space is the angle range between the blocking plate 333 and the first bracket 331-1 and the second bracket 331-2, and the rotating plate 331-12 rotates in the rotation space. When the rotating plate 311-12 is away from the blocking plate 333, the air vent increases, and when the rotating plate 331-12 is against the blocking plate 333, the air vent 331-3 is the smallest. The existence of the blocking plate 333 ensures that the air vent 331-3 is always maintained between the two rotating plates 331-12.

[0070] Please refer to the attached Figure 2 As shown, the anti-material-overflow assembly 330 in the present application further includes a second anti-material-overflow structure 332 , which is disposed on top of the first anti-material-overflow structure 331 along the second direction Y to further restrict the movement of the plastic raw material toward the exhaust channel 320 .

[0071] In one embodiment, the second anti-overflow structure 332 includes a plurality of baffle assemblies sequentially arranged along the second direction Y, and the baffle assemblies may be an arched structure or a spiral structure. When the baffle assembly is an arched structure, the baffle assembly includes a first baffle 332-1 and a second baffle 332-2 arranged at intervals along the second direction Y, the first ends of the first baffle 332-1 and the second baffle 332-2 are connected to the main housing 310, and the second ends of the first baffle 332-1 and the second baffle 332-2 are separated from the main housing 310 to form an S-shaped exhaust channel 320 arranged around the first baffle 332-1 and the second baffle 332-2. The plastic raw material entrained in the vaporized moisture and volatile substances contacts the first bracket 331-1 and the second bracket 331-2, and further contacts the first baffle 332-1 and the second baffle 332-2, thereby adhering to the first baffle 332-1 and the second baffle 332-2, and will fall back into the barrel 100 due to the weight of the plastic raw material itself. Further, in the second anti-overflow structure 332 formed by a plurality of baffle assemblies, a second baffle 332-2 is provided between two adjacent first baffles 332-1 along the second direction Y, or a first baffle 332-1 is provided between two adjacent second baffles 332-2 along the second direction Y.

[0072] In one embodiment, the first baffle 332-1 and the second baffle 332-2 are both made of metal material, and the first baffle 332-1 and the second baffle 332-2 are covered with a heating layer. The heating layer heats the first baffle 332-1 and the second baffle 332-2 to prevent the plastic material from solidifying on the first baffle 332-1 or the second baffle 332-2.

[0073] In one embodiment, the projections of the first baffle 332-1 and the second baffle 332-2 in the same baffle assembly along the second direction Y at the bottom of the main shell intersect, thereby ensuring that the vaporized water and volatile substances can always contact the first baffle 332-1 or the second baffle 332-2.

[0074] In one embodiment, the first baffle 332-1 and the second baffle 332-2 are located at the bottom of the main shell along the second direction Y to form a first projection, and the air vent 331-3 is located at the bottom of the main shell along the second direction Y to form a second projection, and the first projection completely covers the second projection, thereby ensuring that the vaporized water and volatile substances can always contact the first baffle 332-1 or the second baffle 332-2.

[0075] Embodiment 2:

[0076] The present application provides an injection molding machine, including an injection device for the injection molding machine as described in Example 1. The specific structure of the injection device for the injection molding machine is as described in Example 1, and the injection device for the injection molding machine is not further described in this embodiment.

[0077] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples, unless they are contradictory.

[0078] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0079] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. An injection device for an injection molding machine, characterized in that: include, A barrel, wherein an injection cavity is arranged in the barrel along a first direction, and an exhaust hole and a feed hole are arranged in the barrel in sequence along the first direction, and the exhaust hole and the feed hole are both connected to the injection cavity; a screw, the screw being arranged in the injection cavity along the first direction; A feeding cylinder, the feeding cylinder is arranged corresponding to the feeding hole; An exhaust device, wherein the exhaust device is arranged corresponding to the exhaust hole; wherein the exhaust device comprises: A main shell, wherein an exhaust passage is provided in the main shell along the second direction, and a first opening and a second opening are provided on both sides of the exhaust passage in the main shell along the second direction, respectively, and the main shell is connected with the exhaust hole through the first opening; An anti-material-overflow component is arranged in the exhaust channel to limit the movement of plastic raw materials into the exhaust channel; wherein the anti-material-overflow component includes: A first anti-material-overflowing structure, the first anti-material-overflowing structure is arranged at the top of the exhaust hole along the second direction, the first anti-material-overflowing structure is arranged in the exhaust channel, the first anti-material-overflowing structure includes a first bracket and a second bracket arranged at intervals on the left and right, an air hole is formed between the first bracket and the second bracket, the air hole forms a projection on the barrel along the second direction, and the projection is completely within the range of the exhaust hole; A second anti-overflow structure, the second anti-overflow structure is arranged on the top of the first anti-overflow structure along the second direction, the second anti-overflow structure is arranged in the exhaust passage, the second anti-overflow structure includes a plurality of baffle assemblies arranged in sequence along the second direction, the baffle assemblies include a first baffle and a second baffle arranged at intervals along the second direction, the first ends of the first baffle and the second baffle are connected to the main shell, and the second ends of the first baffle and the second baffle are separated from the main shell to form an S-shaped exhaust passage arranged around the first baffle and the second baffle; The first bracket and the second bracket both include a connecting plate and a rotating plate, the connecting plate is transversely arranged in the exhaust passage along a first direction, the first end of the connecting plate is connected to the main shell, and the second end of the connecting plate is rotatably connected to the rotating plate; wherein, The exhaust gas in the barrel drives the rotating plate to rotate, and the size of the air hole changes under the rotation connection of the rotating plate; and the pressure of the exhaust gas in the barrel is set in direct proportion to the size of the air hole; The rotating plate is tilted toward the second opening to guide the vaporized water and volatile substances, and at the same time increase the contact area between the rotating plate and the vaporized water and volatile substances. When the vaporized water and volatile substances are discharged, the plastic is driven into the exhaust hole. However, this part of the plastic raw material will adhere to the rotating plate after contacting the rotating plate, and further fall into the barrel due to its own gravity. The first bracket and the second bracket are made of metal material, and the first bracket and the second bracket are covered with a heating layer. The setting of the heating layer can prevent the molten plastic raw material from being cold and sticking to the exhaust device when passing through the exhaust device; A blocking plate is arranged on the first bracket and / or the second bracket, and the blocking plate is fixedly connected to the connecting plate on the first bracket and / or the second bracket, and a rotation space is formed between the blocking plate and the first bracket and the second bracket, and the rotation space is the angle range between the blocking plate and the first bracket and the second bracket. The rotating plate rotates in the rotation space, and the air vent increases when the rotating plate moves away from the blocking plate, and the air vent is minimized when the rotating plate and the blocking plate are against each other. The existence of the blocking plate ensures that there is always an air vent between the two rotating plates.

2. The injection device for an injection molding machine according to claim 1, characterized in that: The screw is divided into a feeding section, a compression section and a metering section in sequence along the first direction. The exhaust hole is arranged corresponding to the compression section, and the feed hole is arranged corresponding to the feeding section.

3. The injection device for an injection molding machine according to claim 1, characterized in that: The rotating plate is arranged to be inclined toward the second opening.

4. The injection device for an injection molding machine according to claim 1, characterized in that: The projections of the first baffle and the second baffle in the same baffle assembly intersect along the second direction at the bottom of the main shell.

5. The injection device for an injection molding machine according to claim 1, characterized in that: The first baffle and the second baffle are located at the bottom of the main shell along the second direction to form a first projection, and the air vent is located at the bottom of the main shell along the second direction to form a second projection, and the first projection completely covers the second projection.

6. An injection molding machine, characterized in that: The invention comprises the injection device for an injection molding machine as described in any one of claims 1 to 5.

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