Injection device for injection molding machine

Abstract

The utility model relates to the technical field of injection molding, and discloses an injection device for an injection molding machine, which comprises a charging barrel, an injection cavity is arranged in the charging barrel along a first direction, an exhaust hole is arranged in the charging barrel along a second direction, and the exhaust hole is communicated with the injection cavity; the screw rod is arranged in the injection cavity in the first direction; the exhaust device is arranged corresponding to the exhaust hole; the exhaust device comprises a main shell, an exhaust channel is formed in the main shell in a penetrating mode in the second direction, a first opening and a second opening are formed in the two sides, in the main shell in the second direction, of the exhaust channel correspondingly, and the main shell communicates with an exhaust hole through the first opening. And the material overflowing prevention assembly is arranged in the exhaust channel so as to limit the plastic raw materials to move towards the exhaust channel. The injection device for the injection molding machine is capable of exhausting air and avoiding material overflowing.

Description

Technical Field

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

[0002] The screw-type injection molding machine is one of the most widely used injection molding machines at present. The screw-type injection molding machine includes an injection device, and the injection device mainly consists of a screw and a barrel. When the screw-type injection molding machine is working, generally, granular or powdery plastic raw materials are first added into the barrel. Through the rotation of the screw in the barrel and the heating of the barrel, the plastic raw materials become molten state. Then, through the rotation of the screw, the plastic raw materials are driven forward, so that the plastic raw materials are ejected from the nozzle at a very high pressure and speed and injected into the mold. Finally, after pressure holding and cooling, they are fixed into the required molded plastic products.

[0003] When the barrel processes the raw materials through the rotation of the screw, it will go through a pressurization and decompression process. During this process, the moisture and volatile substances in the molten plastic raw materials will vaporize. In order to prevent the vaporized moisture and volatile substances from following the plastic raw materials and being injected into the product, an exhaust hole is provided 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 material leakage. Utility Model Content

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

[0005] To solve the above technical problem, this application provides an injection device for an injection molding machine, which is characterized in that it includes,

[0006] 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 communicated with the injection cavity;

[0007] A screw, the screw is arranged in the injection cavity along the first direction;

[0008] An exhaust device, the exhaust device is correspondingly arranged with the exhaust hole; wherein, the exhaust device includes,

[0009] A main housing, an exhaust channel is arranged through the main housing along the second direction, a first opening and a second opening are respectively arranged on both sides of the exhaust channel in the main housing along the second direction, and the main housing is communicated with the exhaust hole through the first opening;

[0010] An anti-material-leakage component, the anti-material-leakage component is arranged in the exhaust channel to limit the movement of plastic raw materials towards the exhaust channel.

[0011] In an implementable embodiment, the screw is sequentially divided into a feeding section, a compression section, and a metering section along a first direction, and the exhaust hole is correspondingly arranged with the compression section.

[0012] In an implementable embodiment, the barrel is provided with a feed hole along the second direction, the feed hole is communicated with the injection cavity, and the feed hole is correspondingly arranged with the feeding section.

[0013] In an implementable embodiment, the anti-overflow component includes

[0014] a first anti-overflow structure, the first anti-overflow structure is arranged at the top of the exhaust hole along the second direction, the first anti-overflow structure is arranged in the exhaust passage, the first anti-overflow structure includes a first bracket and a second bracket which are arranged at intervals left and right, a ventilation hole is formed between the first bracket and the second bracket, the ventilation hole forms a projection in the barrel along the second direction, and the projection is completely within the range of the exhaust hole.

[0015] In an implementable embodiment, both the first bracket and the second bracket include a connecting plate and a rotating plate, the connecting plate is horizontally arranged in the exhaust passage along the first direction, a first end of the connecting plate is connected to the main housing, and a second end of the connecting plate is rotatably connected to the rotating plate; wherein,

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

[0017] In an implementable embodiment, the rotating plate is inclined towards the second opening.

[0018] In an implementable embodiment, the first bracket and the second bracket are made of a metal material, and a heating layer is covered on the first bracket and the second bracket.

[0019] In an implementable embodiment, the anti-overflow component includes

[0020] a second anti-overflow structure, the second anti-overflow structure is arranged at 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 groups of baffle plate assemblies arranged in sequence along the second direction, each baffle plate assembly includes a first baffle plate and a second baffle plate which are arranged at intervals along the second direction, a first end of the first baffle plate and the second baffle plate is connected to the main housing, and a second end of the first baffle plate and the second baffle plate is separated from the main housing to form an S-shaped exhaust passage arranged around the first baffle plate and the second baffle plate.

[0021] In an implementable embodiment, the first baffle plate and the second baffle plate in the same group of baffle plate assemblies intersect with respect to the projection of the bottom of the main housing along the second direction.

[0022] In an implementable embodiment, a first projection is formed at the bottom of the main housing by the first baffle plate and / or the second baffle plate along the second direction, and a second projection is formed at the bottom of the main housing by the vent holes along the second direction, and the first projection completely covers the second projection.

[0023] Compared with the prior art, the injection device for an injection molding machine of the present application has the following beneficial effects:

[0024] During specific use, the screw rotates in the barrel to drive the plastic raw material to advance forward along the first direction, and the vaporized moisture and volatile substances are discharged by the exhaust device through the exhaust holes, and the anti-overflow component in the exhaust device keeps the plastic raw material in the barrel and prevents the plastic raw material from moving towards the exhaust passage.

[0025] Therefore, the present application has the characteristics of reasonable structure and convenient use. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] FIG. Figure 1 is a schematic structural diagram of an injection device for an injection molding machine of the present application;

[0027] FIG. Figure 2 is a schematic structural diagram of an exhaust device of the present application.

[0028] Explanation of the reference numerals in the drawings:

[0029] X, the first direction; Y, the second direction;

[0030] 100, barrel;

[0031] 110, injection cavity; 120, exhaust holes; 130, feed holes;

[0032] 200, screw;

[0033] 300, exhaust device;

[0034] 310, main housing; 320, exhaust passage; 321, first opening; 322, second opening; 330, anti-overflow component; 331, first anti-overflow structure; 331-1, first bracket; 331-2, second bracket; 331-3, vent holes; 331-11, connecting plate; 331-12, rotating plate; 332, second anti-overflow structure; 332-1, first baffle plate; 332-2, second baffle plate;

[0035] 400, feed barrel. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0036] To make the objectives, features, and advantages of this application more obvious and understandable, the following will clearly and completely describe the technical solutions in the embodiments of this application in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of this application.

[0037] In the prior art, there is a technical problem that plastic raw materials will be discharged from the exhaust holes of the barrel during injection molding.

[0038] For this reason, this application provides an injection device for an injection molding machine, including

[0039] A barrel, in which an injection cavity is arranged along a first direction, and an exhaust hole is arranged along a second direction in the barrel, and the exhaust hole is communicated with the injection cavity;

[0040] A screw, which is arranged in the injection cavity along the first direction;

[0041] An exhaust device, which is arranged corresponding to the exhaust hole; wherein, the exhaust device includes

[0042] A main housing, which is provided with an exhaust passage running through along the second direction. On both sides of the exhaust passage in the main housing along the second direction, a first opening and a second opening are respectively arranged, and the main housing is communicated with the exhaust hole through the first opening;

[0043] An anti-overflow material component, which is arranged in the exhaust passage to limit the movement of plastic raw materials into the exhaust passage.

[0044] Embodiment 1:

[0045] Att Figure 1 is a schematic structural diagram of the injection device for an injection molding machine of this application. Please refer to Att Figure 1 As shown, in the first direction X in this application refers to the length direction of the injection device for an injection molding machine, that is, the left-to-right direction or the right-to-left direction of the injection device for an injection molding machine. The second direction Y of this application refers to the height direction of the injection device for an injection molding machine, that is, the up-and-down direction or the down-and-up direction of the injection device for an injection molding machine. In the injection device for an injection molding machine, the exhaust device 300 is above and the barrel 100 is below.

[0046] Please refer to Att Figure 1As shown in the figure, the injection device for an injection molding machine in the present application includes a barrel 100. The barrel 100 has a long strip structure, and the cross-section of the barrel 100 is circular. An injection cavity 110 is arranged in the barrel 100 along the first direction X. The injection cavity 110 is used to place a screw 200. The outside of the barrel is wrapped with a right heating device. Under the heating of the heating device, the plastic raw material melts in the injection cavity 110 and is injected into the injection molding die under the rotation of the screw 200. An exhaust hole 120 is arranged in the barrel 100 along the second direction Y. The arrangement of the exhaust hole 120 does not interfere with the exhaust hole 120. The exhaust hole 120 is communicated with the injection cavity 110. The water vapor and volatile substances vaporized in the injection cavity 110 are discharged through the exhaust hole 120.

[0047] In one embodiment, the cross-section of the exhaust hole 120 is circular or square.

[0048] In one embodiment, the diameter of the exhaust hole 120 is smaller than the diameter of the injection cavity 110. Further, to prevent the plastic raw material from being discharged through the exhaust hole 120.

[0049] In one embodiment, the injection cavity 110 has a long strip 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.

[0050] Please refer to the attached Figure 1 As shown in the figure, the injection device for an injection molding machine in the present application includes a screw 200. The screw 200 is arranged in the injection cavity 110 along the first direction X. The screw 200 rotates to push the plastic raw material in the barrel 100 forward.

[0051] In one embodiment, the axis of the screw 200 coincides with the axis of the injection cavity 110 to enhance the reliability when the screw 200 rotates.

[0052] Please refer to the attached Figure 1 As shown in the figure, the injection device for an injection molding machine in the present application includes an exhaust device 300. 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 fixedly connected to the barrel 100 by welding or bolt connection. To realize that the water vapor and volatile substances vaporized are discharged through the exhaust hole 120 via the exhaust device 300. The arrangement of the exhaust device 300 can prevent the plastic raw material from overflowing outward through the exhaust hole 120.

[0053] Please refer to the attached Figure 1As shown in the figure, the screw 200 is sequentially divided into a feeding section, a compression section, and a metering section along the first direction X. Both ends of the compression section are connected to the feeding section and the metering section respectively. And the exhaust hole 120 is correspondingly arranged with the compression section to facilitate the discharge of the vaporized moisture and volatile substances. Moreover, the pressure in the compression section is not as high as that in the metering section, so the plastic raw material is not likely to overflow from the exhaust hole 120.

[0054] The barrel 100 is provided with a feed hole 130 along the second direction Y. The feed hole 130 is communicated with the injection cavity 110 and is correspondingly arranged with the feeding section. In an embodiment, the feed hole 130 is connected to the feed cylinder 400. The plastic raw material enters the barrel 100 from the feed cylinder 400 through the feed hole 130.

[0055] In an embodiment, the feed cylinder 400 has a funnel-shaped structure.

[0056] Attached Figure 2 is a schematic structural diagram of the exhaust device of the present application. Please refer to the attached Figure 2 As shown in the figure, the exhaust device 300 includes a main housing 310. The main housing 310 is provided with an exhaust passage 320 penetrating along the second direction Y. The exhaust passage 320 is a discharge passage for the vaporized moisture and volatile substances. First openings 321 and second openings 322 are respectively arranged on both sides of the exhaust passage 320 in the main housing 310 along the second direction Y. The first opening 321 is located at the bottom of the exhaust passage 320, and the main housing 310 is connected to the exhaust hole 120 through the first opening 321. The second opening 322 is located at the top of the exhaust passage 320, and the vaporized moisture and volatile substances in the exhaust passage 320 are discharged to the outside through the second opening 322.

[0057] In an embodiment, the main housing 310 has a rectangular structure. The main housing 310 and the anti-overflow component 330 are both made of metal materials to avoid damage to the exhaust device 300 caused by high temperature. Further, a heating layer can be installed on the exhaust device 300. The setting of the heating layer can prevent the molten plastic raw material from pre-cooling and sticking to the exhaust device 300 when passing through the exhaust device 300.

[0058] In an embodiment, the heating layer is attached to the outer surface of the main housing 310.

[0059] Please refer to the attached Figure 2As shown, the exhaust device 300 further includes an anti-overflow component 330. The anti-overflow component 330 is disposed in the exhaust passage 320 to limit the movement of plastic raw materials into the exhaust passage 320. Further, the anti-overflow component 330 includes a first anti-overflow structure 331 and a second anti-overflow structure 332. The separate or combined setting of the first anti-overflow structure 331 and the second anti-overflow structure 332 can block the plastic raw materials from entering the main housing 310. In this application, the effect of the combined setting of the first anti-overflow structure 331 and the second anti-overflow structure 332 is better than the separate setting of the first anti-overflow structure 331 or the second anti-overflow structure 332.

[0060] Among them, the anti-overflow component 330 includes a first anti-overflow structure 331. The first anti-overflow structure 331 is disposed at the top of the exhaust hole 120 along the second direction Y. The first anti-overflow structure is disposed in the exhaust passage 320 to block the plastic raw materials from entering the main housing 310 while reducing the exhaust hole 120.

[0061] Further, the first anti-overflow structure 331 includes a first bracket 331-1 and a second bracket 331-2 that are spaced apart left and right. A ventilation hole 331-3 is formed between the first bracket 331-1 and the second bracket 331-2. The vaporized moisture and volatile substances enter the main housing 310 through the ventilation hole 331-3. The ventilation hole 331-3 forms a projection on the barrel 100 along the second direction Y, and the projection is completely within the range of the exhaust hole 120, that is, the ventilation hole 331-3 and the exhaust hole 120 are vertically corresponding, so as to facilitate the vaporized moisture and volatile substances to enter the ventilation hole 331-3 through the exhaust hole 120. And the size of the ventilation hole 331-3 is smaller than the size of the exhaust hole 120, so as to prevent the plastic raw materials from entering the main housing 310.

[0062] In one embodiment, both the first bracket 331-1 and the second bracket 331-2 include a connecting plate 331-11 and a rotating plate 331-12. The connecting plate 331-11 is horizontally arranged in the exhaust hole 120 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 gas formed by the vaporized moisture and volatile substances in the barrel 100 drives the rotating plate 331-12 to rotate. When the exhaust gas pressure is greater, the angle between the rotating plate 331-12 and the connecting plate 331-11 is larger, and at the same time, the ventilation hole 331-3 is also larger. That is, the exhaust gas pressure in the barrel 100 is set in direct proportion to the size of the ventilation hole 331-3. Thus, the size of the ventilation hole 331-3 is automatically adjusted according to the exhaust gas pressure, so as to meet the exhaust standard of the injection device for the injection molding machine and avoid the situation that the vaporized moisture and volatile substances remain in the barrel 100. Further, the weight of the rotating plate 331-12 or the damping between the rotating plate 331-12 and the connecting plate 331-11 can be adjusted to adjust the rotation angle of the rotating plate 331-12.

[0063] In one embodiment, the rotating plate 331-12 is inclined towards the second opening 322 to form a guiding property for the vaporized moisture and volatile substances, and at the same time increase the contact area between the rotating plate 331-12 and the vaporized moisture and volatile substances. When discharging the vaporized moisture and volatile substances, it will drive the plastic 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.

[0064] In one embodiment, both the first bracket 331-1 and the second bracket 331-2 are made of metal materials, and a heating layer is covered on the first bracket 331-1 and the second bracket 331-2. The heating layer heats the first bracket 331-1 and the second bracket 331-2 to prevent the plastic raw material from curing on the first bracket 331-1 or the second bracket 331-2.

[0065] In one embodiment, a baffle is provided on the first bracket 331-1 and / or the second bracket 331-2. The baffle 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 baffle and the first bracket 331-1 and the second bracket 331-2. The rotation space is the angular range between the baffle and the first bracket 331-1 and the second bracket 331-2. The rotating plate 331-12 rotates within the rotation space. When the rotating plate 311-12 moves away from the baffle, the ventilation holes increase. When the rotating plate 331-12 abuts against the baffle, the ventilation holes 331-3 are minimized. The presence of the baffle ensures that there are always ventilation holes 331-3 between the two rotating plates 331-12.

[0066] Please refer to the attached Figure 2 As shown in the figure, the anti-overflow component 330 in the present application further includes a second anti-overflow structure 332. The second anti-overflow structure 332 is disposed on the top of the first anti-overflow structure 331 along the second direction Y, so as to further restrict the movement of the plastic raw material towards the exhaust passage 320.

[0067] In one embodiment, the second anti-overflow structure 332 includes a plurality of sets of baffle plate assemblies arranged in sequence along the second direction Y. The baffle plate assemblies can be in an arcuate structure or a spiral structure. When the baffle plate assembly is in an arcuate structure, the baffle plate assembly includes a first baffle plate 332-1 and a second baffle plate 332-2 spaced along the second direction Y. The first ends of the first baffle plate 332-1 and the second baffle plate 332-2 are connected to the main housing 310, and the second ends of the first baffle plate 332-1 and the second baffle plate 332-2 are separated from the main housing 310 to form an S-shaped exhaust passage 320 arranged around the first baffle plate 332-1 and the second baffle plate 332-2. Thus, the plastic raw materials entrained in the vaporized moisture and volatile substances further contact the first baffle plate 332-1 and the second baffle plate 332-2 while contacting the first bracket 331-1 and the second bracket 331-2, so as to adhere to the first baffle plate 332-1 and the second baffle plate 332-2, and will fall back into the barrel 100 due to the weight of the plastic raw materials themselves. Further, in the second anti-overflow structure 332 formed by a plurality of sets of baffle plate assemblies, a second baffle plate 332-2 is provided between two adjacent first baffle plates 332-1 along the second direction Y, or a first baffle plate 332-1 is provided between two adjacent second baffle plates 332-2 along the second direction Y.

[0068] In one embodiment, both the first baffle 332-1 and the second baffle 332-2 are made of a metal material, and a heating layer is covered on the first baffle 332-1 and the second baffle 332-2. The heating layer heats the first baffle 332-1 and the second baffle 332-2 to prevent the plastic raw material from solidifying on the first baffle 332-1 or the second baffle 332-2.

[0069] In one embodiment, the projections of the first baffle 332-1 and the second baffle 332-2 in the same set of baffle assemblies along the second direction Y on the bottom of the main housing 310 intersect. Thereby ensuring that the vaporized moisture and volatile substances can always come into contact with the first baffle 332-1 or the second baffle 332-2.

[0070] In one embodiment, the first baffle 332-1 and the second baffle 332-2 form a first projection along the second direction Y on the bottom of the main housing 310, and the vent hole 331-3 forms a second projection along the second direction Y on the bottom of the main housing 310, and the first projection completely covers the second projection. Thereby ensuring that the vaporized moisture and volatile substances can always come into contact with the first baffle 332-1 or the second baffle 332-2.

[0071] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection 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 can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples.

[0072] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of these features. In the description of the present application, "a plurality" means two or more, unless otherwise specifically defined.

[0073] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present application, and all should be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An injection device for an injection molding machine, characterized in that, Comprising, 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 communicates with 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 comprises, A main housing, an exhaust passage is arranged through the main housing along the second direction, a first opening and a second opening are respectively arranged on both sides of the exhaust passage in the main housing along the second direction, and the main housing communicates with the exhaust hole through the first opening; An anti-overflow component, the anti-overflow component is arranged in the exhaust passage to limit the movement of plastic raw materials into the exhaust passage.

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

3. The injection device for an injection molding machine according to claim 2, characterized in that, The barrel is provided with a feeding hole along the second direction, the feeding hole communicates with the injection cavity, and the feeding hole is arranged corresponding to the feeding section.

4. The injection device for an injection molding machine according to claim 1, characterized in that, The anti-overflow component comprises, A first anti-overflow structure, the first anti-overflow structure is arranged at the top of the exhaust hole along the second direction, the first anti-overflow structure is arranged in the exhaust passage, the first anti-overflow structure comprises a first bracket and a second bracket arranged at intervals left and right, a ventilation hole is formed between the first bracket and the second bracket, the ventilation hole forms a projection in the barrel along the second direction, and the projection is completely within the range of the exhaust hole.

5. The injection device for an injection molding machine according to claim 4, wherein, Both the first bracket and the second bracket comprise a connecting plate and a rotating plate, the connecting plate is horizontally arranged in the exhaust passage along the first direction, the first end of the connecting plate is connected to the main housing, and the second end of the connecting plate is rotatably connected to the rotating plate; wherein, The exhaust in the barrel drives the rotating plate to rotate, and under the rotation connection of the rotating plate, the size of the ventilation hole changes; and the pressure of the exhaust in the barrel is set in direct proportion to the size of the ventilation hole.

6. The injection device for an injection molding machine according to claim 5, characterized in that, The rotating plate is inclined towards the second opening.

7. The injection device for an injection molding machine according to claim 4, wherein, The first bracket and the second bracket are made of a metal material, and a heating layer is covered on the first bracket and the second bracket.

8. The injection device for an injection molding machine according to claim 4, characterized in that, The anti-overflow component comprises, A second anti-overflow structure, the second anti-overflow structure is arranged at 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 comprises a plurality of groups of baffle plate assemblies arranged in sequence along the second direction, each baffle plate assembly comprises a first baffle plate and a second baffle plate arranged at intervals along the second direction, the first ends of the first baffle plate and the second baffle plate are connected to the main housing, and the second ends of the first baffle plate and the second baffle plate are separated from the main housing to form an S-shaped exhaust passage arranged around the first baffle plate and the second baffle plate.

9. The injection device for an injection molding machine according to claim 8, characterized in that, The first baffle plate and the second baffle plate in the same group of baffle plate assemblies intersect at the projection on the bottom of the main housing along the second direction.

10. The injection device for an injection molding machine according to claim 8, characterized in that, The first baffle plate and the second baffle plate form a first projection at the bottom of the main housing along the second direction, the ventilation holes form a second projection at the bottom of the main housing along the second direction, and the first projection completely covers the second projection.

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