PU machine head additionally provided with fine powder for foaming

Abstract

The utility model discloses a PU machine head with additional fine powder for foaming, and relates to the technical field of PU machine heads, the PU machine head comprises a mixing chamber and a hopper-shaped material barrel, a feeding mechanism and at least one needle valve part are arranged on the side wall of the mixing chamber, the feeding mechanism comprises a feeding shell, a feeding port, a discharging port and a fine powder feeding component, and the feeding port is connected with the discharging port. The interior of the feeding shell communicates with the interior of the mixing chamber through a discharging opening. A feeding hole is formed in the arc top of the feeding shell and is communicated with the bottom of the hopper-shaped charging basket; one end of the fine powder feeding part is in a corresponding state with the discharge hole; the fine powder feeding part is used for pushing fine powder falling into the feeding shell into the mixing chamber; the needle valve part is arranged on one side wall of the mixing chamber and is used for extruding a PU liquid material into the mixing chamber in a multi-component manner. According to the utility model, the problem that fine powder is accumulated in the traditional machine head is solved, and the reduction of the feeding quantity and the influence on the product quality are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of PU machine heads, in particular to a PU machine head for externally adding fine powder for foaming. Background Art

[0002] When making insole or sole by PU (polyurethane) foaming, the PU material is extruded into a mold through a foaming machine head for foaming and forming. Due to different required functions of the foamed insole or sole, fine powder with different functions needs to be added. For example, when flame retardancy is required, flame retardant powder needs to be mixed for foaming. The PU liquid material is to extrude component A and component B through a needle valve into the mixing chamber of the machine head, mix with the fine powder, and then extrude into the mold through a blanking nozzle for foaming.

[0003] At present, there is a problem that fine powder accumulates before and after the discharge port during the production process. After a period of time, the fine powder will agglomerate, resulting in a reduction in the feeding amount and affecting the product quality. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a PU machine head for externally adding fine powder for foaming to solve the problems raised in the background art.

[0005] To achieve the above purpose, the utility model provides the following technical solutions:

[0006] A PU machine head for externally adding fine powder for foaming includes a mixing chamber and a hopper-shaped material bucket for storing fine powder. A feeding mechanism and at least one needle valve part are arranged on the side wall of the mixing chamber. The feeding mechanism includes a feeding housing, a feeding port, a discharge port, and a fine powder feeding component. One end of the feeding housing is fixedly connected to the outer wall of the mixing chamber, and the inside of the feeding housing is communicated with the inside of the mixing chamber through the discharge port; the top of the arc of the feeding housing is provided with a feeding port, and the feeding port is communicated with the bottom of the hopper-shaped material bucket; the fine powder feeding component is arranged inside the feeding housing, and one end of the fine powder feeding component corresponds to the discharge port; the fine powder feeding component is used to push the fine powder falling into the inside of the feeding housing into the inside of the mixing chamber; the needle valve part is arranged on one side wall of the mixing chamber, and the needle valve part is used to extrude the PU liquid material into the inside of the mixing chamber in a multi-component manner.

[0007] Based on the above technical solutions, the utility model also provides the following optional technical solutions:

[0008] In an optional solution: a feeding motor is arranged at the end of the feeding housing far from the mixing chamber. The fine powder feeding component includes a feeding screw rod. One end of the feeding screw rod corresponds to the discharge port, and the other end of the feeding screw rod is rotatably connected to the end of the feeding housing. A belt wheel part is arranged at the end of the feeding screw rod far from the mixing chamber, and the belt wheel part is connected to the output end of the feeding motor through a belt.

[0009] In an alternative solution: the feeding screw rod is hollow and a central push rod capable of axially moving relative to it is arranged inside the feeding screw rod. A pushing part is arranged at the end of the central push rod facing the discharge port. A shaft sleeve is installed at the end of the central push rod away from the discharge port, and the shaft sleeve is connected to the step of the inner cavity of the feeding screw rod through a spring member; a pushing cylinder is further arranged at the end of the feeding housing away from the mixing chamber, and the telescopic end of the pushing cylinder corresponds to the end of the central push rod away from the discharge port.

[0010] In an alternative solution: a pushing and mixing component is further arranged inside the mixing chamber. The pushing and mixing component includes a central shaft rod, stirring vanes and feeding spiral vanes. The central shaft rod is rotatably arranged along the axis of the mixing chamber. The stirring vanes and the feeding spiral vanes are both arranged on the outer wall of the central shaft rod. The stirring vanes stir the fine powder material and the PU liquid material by rotation, and the spiral on the feeding spiral vanes pushes the mixed material composed of the fine powder material and the PU liquid material towards the port of the central shaft rod.

[0011] In an alternative solution: the positions where the needle valve part is connected to the outer wall of the mixing chamber and the position of the discharge port are both arranged corresponding to the stirring vanes.

[0012] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0013] 1. In the present utility model, the fine powder feeding is quickly introduced into the mixing chamber in a spiral conveying manner. After the feeding is completed, the remaining fine powder feeding at the discharge port is pushed into the mixing chamber by a pushing method. The present utility model solves the problem of fine powder accumulation in the traditional machine head, and avoids the reduction of the feeding amount and the influence on the product quality. Description of the Drawings

[0014] Figure 1 It is a schematic diagram of the overall structure of the PU machine head in an embodiment of the present utility model.

[0015] Figure 2 In an embodiment of the present utility model Figure 1 of the cross-sectional structure schematic diagram.

[0016] Figure 3 It is a schematic diagram of the structure of the feeding mechanism in an embodiment of the present utility model.

[0017] Annotation of the reference numerals: hopper-shaped material bucket 100, mixing chamber 200, central shaft rod 210, stirring vanes 220, feeding spiral vanes 230, feeding mechanism 300, feeding housing 310, feed inlet 320, discharge port 330, central push rod 340, feeding screw rod 350, pushing cylinder 360, belt wheel part 370, shaft sleeve 380, spring member 390, needle valve part 400, feeding motor 500. Detailed Embodiments

[0018] In order to make the purpose, technical solutions and advantages of the present utility model more clear and understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments; in the drawings or descriptions, similar or identical parts are denoted by the same reference numerals, and in actual applications, the shapes, thicknesses or heights of the various components can be enlarged or reduced. The various embodiments listed in the present utility model are only used to illustrate the present utility model and are not intended to limit the scope of the present utility model. Any obvious modification or change made to the present utility model does not depart from the spirit and scope of the present utility model.

[0019] In one embodiment, as Figures 1 - 3 shown, a PU head for externally adding fine powder to generate foam includes a mixing chamber 200 and a hopper-shaped material bucket 100 for storing fine powder. A feeding mechanism 300 and at least one needle valve part 400 are provided on the side wall of the mixing chamber 200. The feeding mechanism 300 includes a feeding housing 310, a feeding port 320, a discharging port 330 and a fine powder feeding component. One end of the feeding housing 310 is fixedly connected to the outer wall of the mixing chamber 200, and the inside of the feeding housing 310 is communicated with the inside of the mixing chamber 200 through the discharging port 330; the top of the arc of the feeding housing 310 is provided with the feeding port 320, and the feeding port 320 is communicated with the bottom of the hopper-shaped material bucket 100; the fine powder feeding component is arranged inside the feeding housing 310, and one end of the fine powder feeding component is in a corresponding state with the discharging port 330; the fine powder feeding component is used to push the fine powder falling into the inside of the feeding housing 310 into the inside of the mixing chamber 200; the needle valve part 400 is arranged on one side wall of the mixing chamber 200, and the needle valve part 400 is used to extrude the PU liquid material into the inside of the mixing chamber 200 in a multi-component manner.

[0020] In the actual use process of the embodiment of the present utility model, the fine powder stored in the hopper-shaped material bucket 100 falls into the inside of the feeding housing 310 through the feeding port 320. Under the transportation of the fine powder feeding component, the fine powder enters the inside of the mixing chamber 200 through the discharging port 330. At the same time, the needle valve part 400 introduces the PU liquid material into the inside of the mixing chamber 200, and the fine powder material is mixed with the PU liquid material. And under the extrusion action of the needle valve part 400, the mixture in the mixing chamber 200 is ejected from the end; thus, the problem of fine powder accumulation in the traditional head can be solved, and the reduction of the feeding amount and the influence on the product quality are avoided; among them, the needle valve part 400 is driven by an externally connected cylinder, and the PU liquid material is stored in the material cylinder. This needle valve belongs to the prior art and will not be described in detail here.

[0021] In one embodiment, as Figures 1 - 3As shown, a feeding motor 500 is provided at the end of the feeding housing 310 away from the mixing chamber 200. The fine powder feeding component includes a feeding screw rod 350. One end of the feeding screw rod 350 corresponds to the discharge port 330, and the other end of the feeding screw rod 350 is rotatably connected to the end of the feeding housing 310. A pulley portion 370 is provided at the end of the feeding screw rod 350 away from the mixing chamber 200, and the pulley portion 370 is connected to the output end of the feeding motor 500 by a belt. In the actual application process of the embodiment of the present invention, the fine powder material entering the feeding housing 310 through the feeding port 320 is located between the feeding screw rod 350 and the inner wall of the feeding housing 310. The feeding motor 500 drives the feeding screw rod 350 to rotate through the transmission of the belt and the pulley portion 370. The spiral on the rotating feeding screw rod 350 pushes the fine powder material towards the feeding port 320 and enters the interior of the mixing chamber 200 through the feeding port 320.

[0022] In one embodiment, as Figures 1 - 3 shown, the feeding screw rod 350 is hollow, and a central push rod 340 capable of axially moving relative to it is provided inside the feeding screw rod 350. A pushing portion is provided at the end of the central push rod 340 facing the discharge port 330. A mounting sleeve 380 is installed at the end of the central push rod 340 away from the discharge port 330, and the mounting sleeve 380 is connected to the step of the inner cavity of the feeding screw rod 350 by a spring member 390. A pushing cylinder 360 is further provided at the end of the feeding housing 310 away from the mixing chamber 200, and the telescopic end of the pushing cylinder 360 corresponds to the end of the central push rod 340 away from the discharge port 330. In the actual application process of the embodiment of the present invention, after the spiral on the feeding screw rod 350 pushes the fine powder material into the interior of the mixing chamber 200, the central push rod 340 is pushed by the pushing cylinder 360, and the pushing portion at its end pushes the fine powder material remaining at the discharge port 330 to prevent the fine powder material from accumulating at the discharge port 330. The pushing cylinder 360 resets, and the central push rod 340 resets under the action of the spring member 390 and waits for the next action.

[0023] In one embodiment, as Figure 2As shown, a feeding and mixing component is further disposed inside the mixing chamber 200. The feeding and mixing component includes a central shaft rod 210, stirring vanes 220, and a feeding spiral vane 230. The central shaft rod 210 is rotatably disposed along the axial direction of the mixing chamber 200. Both the stirring vanes 220 and the feeding spiral vane 230 are disposed on the outer wall of the central shaft rod 210. The stirring vanes 220 stir the fine powder material and the PU liquid material by rotation, and the spiral on the feeding spiral vane 230 pushes the mixed material composed of the fine powder material and the PU liquid material towards the port of the central shaft rod 210. In the actual application process of the embodiment of the present utility model, after the fine powder material and the PU liquid material enter the inside of the mixing chamber 200, the central shaft rod 210 rotates under the action of an external motor. The rotating stirring vanes 220 stir the fine powder material and the PU liquid material and make the two mix with each other. The mixed material flows out through the port of the mixing chamber 200 under the spiral push of the feeding spiral vane 230.

[0024] In one embodiment, as Figure 2 shown, the positions where the needle valve portion 400 is connected to the outer wall of the mixing chamber 200 and the position of the discharge port 330 are both correspondingly arranged relative to the stirring vanes 220. In the actual application of the embodiment of the present utility model, since the connection position between the needle valve portion 400 and the outer wall of the mixing chamber 200 corresponds to the stirring vanes 220, when the PU liquid material just enters the inside of the mixing chamber 200, it is under the rotational movement of the stirring vanes 220. And the fine powder material enters the inside of the mixing chamber 200 through the discharge port 330 and is also stirred by the stirring vanes 220 at the same time, thereby facilitating the mixing of the fine powder material and the PU liquid material.

[0025] The above is only the specific implementation manner of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present disclosure can easily think of changes or substitutions, which should all be covered within the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be subject to the protection scope of the claims.

Claims

1. A PU head for externally adding fine powder to generate foam, comprising a mixing chamber and a hopper-shaped material barrel for storing fine powder. A feeding mechanism and at least one needle valve part are arranged on the side wall of the mixing chamber, and it is characterized in that, The feeding mechanism includes a feeding housing, a feeding inlet, a discharging outlet and a fine powder feeding component. One end of the feeding housing is fixedly connected to the outer wall of the mixing chamber, and the inside of the feeding housing is communicated with the inside of the mixing chamber through the discharging outlet. The arc top of the feeding housing is provided with a feeding inlet, and the feeding inlet is communicated with the bottom of the hopper-shaped material bucket. The fine powder feeding component is arranged inside the feeding housing, and one end of the fine powder feeding component corresponds to the discharging outlet. The fine powder feeding component is used to push the fine powder falling into the inside of the feeding housing into the inside of the mixing chamber. The needle valve part is arranged on one side wall of the mixing chamber, and the needle valve part is used to extrude the PU liquid material into the inside of the mixing chamber in a multi-component manner.

2. The PU head for externally adding fine powder to generate foam according to claim 1, wherein A feeding motor is arranged at the end of the feeding housing away from the mixing chamber. The fine powder feeding component includes a feeding screw rod. One end of the feeding screw rod corresponds to the discharging outlet, and the other end of the feeding screw rod is rotatably connected to the end of the feeding housing. A pulley part is arranged at the end of the feeding screw rod away from the mixing chamber, and the pulley part is connected to the output end of the feeding motor through a belt.

3. The PU head with externally added fine powder for foaming according to claim 2, characterized in that, The feeding screw rod is hollow, and a central push rod capable of axially moving relative to it is arranged inside the feeding screw rod. A pushing part is arranged at the end of the central push rod facing the discharging outlet. A mounting sleeve is installed at the end of the central push rod away from the discharging outlet, and the mounting sleeve is connected to the step of the inner cavity of the feeding screw rod through a spring part. A pushing cylinder is also arranged at the end of the feeding housing away from the mixing chamber, and the telescopic end of the pushing cylinder corresponds to the end of the central push rod away from the discharging outlet.

4. The PU head with externally added fine powder for foaming according to claim 1, characterized in that, A pushing and mixing component is also arranged inside the mixing chamber. The pushing and mixing component includes a central shaft rod, stirring blades and feeding spiral blades. The central shaft rod is rotatably arranged along the axial direction of the mixing chamber. The stirring blades and the feeding spiral blades are both arranged on the outer wall of the central shaft rod. The stirring blades stir the fine powder material and the PU liquid material by rotation, and the spiral on the feeding spiral blade pushes the mixture composed of the fine powder material and the PU liquid material towards the port of the central shaft rod.

5. The PU head with externally added fine powder for foaming according to claim 4, wherein The positions where the needle valve part is connected to the outer wall of the mixing chamber and the discharging outlet are both correspondingly arranged relative to the stirring blades.

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