Rotary minute throwing wheel of PU material spraying equipment and PU material spraying equipment

Abstract

The embodiment of the utility model relates to a rotary minute throwing wheel of PU (polyurethane) material spraying equipment and the PU material spraying equipment. The rotary throwing wheel comprises a shaft rod and a rotating wheel, the first end of the shaft rod is connected to the center of the rotating wheel, and the second end of the shaft rod is used for being inserted into an outer sleeve nozzle of PU material spraying equipment and is coaxially connected to the lower portion of a mixing head, so that the shaft rod and the mixing head rotate coaxially; the rotating wheel comprises one or more wheel sheets, and each wheel sheet comprises a central part and a plurality of staggered wheel teeth; the plurality of wheel sheets are coaxially overlapped, the wheel teeth on one wheel sheet and the wheel teeth on at least another wheel sheet are arranged in a staggered manner, and the wheel teeth are used for receiving part of PU material particles for side spraying; gaps exist between the wheel teeth of the multiple wheel pieces which are arranged in an overlapped mode, so that part of PU material particles can penetrate through the gaps to fall to the lower side of the rotary throwing and dividing wheel, and bottom spraying is carried out. And the PU material spraying equipment comprises a rotary throwing wheel.

Description

Technical Field

[0001] This utility model relates to the field of PU (polyurethane) material molding technology, and in particular to a rotary splitting wheel for PU material spraying equipment and PU material spraying equipment. Background Technology

[0002] In the molding process of PU (polyurethane) materials, a casting process is typically used. This involves using casting equipment to pour the foamed material into a mold, where it foams and expands to form the corresponding PU product. For example, in the manufacturing process of shoe soles, PU material is poured into a shoe sole mold, and after foaming for a predetermined time, the sole is formed. Related casting equipment can be found in the inventor's prior Chinese invention patent 201611168678.6.

[0003] Because of the casting process, the foaming material extruded from the casting equipment falls unevenly into the mold. The foaming material is then leveled by scraping or by gravity. Therefore, unwanted air bubbles are easily mixed in during the process of pouring the foaming material into the mold, resulting in the foaming material not filling the mold completely, causing large air bubbles in the product and affecting product quality.

[0004] To overcome the aforementioned shortcomings, spraying equipment for PU (polyurethane) materials has also emerged. This equipment incorporates airflow channels at the lower outer casing and nozzle position, applying airflow to the PU material exiting through the nozzle. The PU material is then sprayed onto the area below the nozzle under the influence of the airflow, thus preventing the formation of air bubbles. The inventor's prior Chinese utility model patent also discloses the same technology.

[0005] However, the spraying area of ​​the aforementioned spraying equipment is relatively limited. If the spraying area is large, it is necessary to change or adjust the position of the spraying equipment and / or the mold below the nozzle. The aforementioned spraying equipment is advantageous for spraying the planar area of ​​the mold below the nozzle. If the side and vertical surfaces of the planar area also need to be sprayed, the placement direction of the mold or a specific mold is required to complete the spraying. For example, in the process of manufacturing shoe soles, spraying the bottom surface of PU material soles that contacts the ground is easy and does not require adjusting the placement direction of the sole mold. However, the raised areas at the edges of the sole cannot be sprayed simultaneously with the sole surface and require additional steps or specific molds. Utility Model Content

[0006] To solve the above-mentioned technical problems and to spray the bottom and sides simultaneously, this utility model proposes a rotary splitter wheel for PU material spraying equipment and a PU material spraying device.

[0007] According to one aspect of this utility model, a rotating splitter wheel for a PU material spraying device is provided, the rotating splitter wheel comprising a shaft and a rotating wheel.

[0008] The first end of the shaft is connected to the center of the rotary wheel, and the second end of the shaft is used to insert into the outer nozzle of the PU material spraying equipment and coaxially connected to the lower part of the mixing head, so that the shaft rotates coaxially with the mixing head;

[0009] The rotating wheel includes one or more wheel pieces, each wheel piece including a central portion and a plurality of staggered teeth, the plurality of teeth being uniformly connected to the outer peripheral edge of the central portion; the plurality of wheel pieces are coaxially overlapped, the teeth on one wheel piece being staggered in the circumferential direction from the teeth on at least another wheel piece, for receiving a portion of PU material particles for side spraying; there are gaps in the circumferential direction between the teeth of the overlapping plurality of wheel pieces, allowing a portion of PU material particles to pass through the gaps and fall to the underside of the rotating wheel for bottom spraying.

[0010] In one embodiment, the teeth on one wheel are staggered in the circumferential direction from the teeth on the other wheel.

[0011] In one embodiment, the gear teeth are arc-shaped strips, and the arc-shaped arches of the gear teeth in their width direction face the rotation direction of the wheel.

[0012] In one embodiment, the gear teeth have an upward or downward arc-shaped bend along their length.

[0013] In one embodiment, multiple wheel pieces are coaxially overlapped and sleeved on the first end of the axle, with a washer spaced between adjacent wheel pieces.

[0014] In one embodiment, a square-shaped dividing groove is formed on the outer end face of the free end of the gear tooth to divide the gear tooth into upper and lower layers; and / or,

[0015] The upper and lower surfaces of the gear teeth form an acute angle on the shaft side.

[0016] According to another aspect of this utility model, a PU material spraying device is provided, the PU material spraying device comprising a mixing chamber, a mixing head, an outer nozzle, and a rotating dispersing wheel.

[0017] The upper part of the mixing head is located in the space of the mixing chamber, and the lower part of the mixing head is accommodated in the space of the outer nozzle below the mixing chamber.

[0018] The outer sleeve nozzle has a gas flow passage in its side wall, the outlet of the gas flow passage is located in the bottom area of ​​the outer sleeve nozzle, the inlet of the gas flow passage is used to connect to a gas source, and the end of the gas flow passage is inclined downward to connect to the outlet.

[0019] In one embodiment, the gas flow passage is an annular sandwich structure formed in the sidewall of the outer nozzle, and the gas outlet is annular, located at the bottom of the outer nozzle, surrounding the outer side of the outlet of the outer nozzle; and / or,

[0020] The air outlet is located on the inner side wall of the discharge port of the outer sleeve nozzle.

[0021] In one embodiment, the mixing head is cylindrical and includes a helical portion, a wing portion, and an inverted boss arranged sequentially along the axial direction.

[0022] The spiral section is located at the top of the mixing head, and spiral protrusions are uniformly provided on its cylindrical surface;

[0023] The wing section is located below the spiral section, and multiple rows of winglets are uniformly arranged along the axial direction of the mixing head on its cylindrical surface. The outer edge of the winglets is flush with the outer edge of the spiral section. Each row of winglets includes multiple inclined winglets arranged at uniform intervals. The multiple winglets on the wing section have the same shape and inclination direction, and the inclination direction of the winglets is approximately the same as the spiral direction of the spiral section.

[0024] The mixing head and the rotating splitter rotate at 3000-8000 revolutions per minute.

[0025] In one embodiment, the wing is plate-shaped, and the angle between the side axis of the wing adjacent to its cylindrical surface and the side axis of the wing away from its cylindrical surface is 0-15°.

[0026] The beneficial effects of this utility model are as follows: By setting the rotating splitter wheel of this utility model at the discharge port in the PU material spraying equipment, the rotating splitter wheel rotates at high speed during the spraying process. At the same time as spraying downwards, the material sprayed on the surface of the rotating splitter wheel is sprayed to the side under the action of centrifugal force, that is, the spraying of the plane and the side vertical surface can be completed simultaneously. Attached Figure Description

[0027] Figure 1 This is a longitudinal cross-sectional view of a PU material spraying device according to an embodiment of the present invention;

[0028] Figure 2 This is a perspective view of the mixing head F according to an embodiment of the present invention;

[0029] Figure 3 yes Figure 1 Longitudinal cross-sectional view of the mixing head F, outer nozzle G, and rotating splitter H;

[0030] Figure 4 This is a perspective view of the rotating splitter wheel H according to a preferred embodiment;

[0031] Figure 5 This is a perspective view of the rotating splitter wheel H of another preferred embodiment;

[0032] Figure 6 yes Figure 5 A perspective view of the wheel plate of the rotating splitter wheel H in the preferred embodiment shown;

[0033] Figure 7 This is a perspective view of the rotating splitter H in another preferred embodiment. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and the accompanying drawings. However, those skilled in the art will understand that this utility model is not limited to the accompanying drawings and the following embodiments.

[0035] As described herein, the term "including" and its variations can be understood as open-ended terms, meaning "including but not limited to". The term "based on" and similar expressions can be understood as "at least based on". The terms "first", "second", "third", etc., are used only to distinguish different features and have no substantive meaning. The terms "left", "right", "middle", and similar expressions are used only to indicate positional relationships between relative objects.

[0036] like Figure 1 The diagram illustrates a PU material spraying device according to an embodiment of the present invention. The spraying device includes a motor A, a main shaft B, a bearing housing C, a connecting plate D, a mixing chamber E, a mixing head F, an outer nozzle G, and a rotating splitter H. The bearing housing C is fixed to the connecting plate D, and the mixing chamber E and the outer nozzle G are sequentially arranged below the connecting plate D. The main shaft B is rotatably positioned by the bearing housing C. One end of the main shaft B extends from the upper end of the bearing housing C and is drivably connected to the motor A; the other end of the main shaft B extends from the lower end of the bearing housing C, passes through the connecting plate D, and extends into the mixing chamber E. The mixing head F is coaxially connected to the end of the main shaft B extending into the mixing chamber E. The upper part of the mixing head F is located in the space of the mixing chamber E, and the lower part of the mixing head F is accommodated in the space of the outer nozzle G below the mixing chamber E. The rotating splitting wheel H includes a shaft 1 and a rotating wheel 2. The first end of the shaft 1 is connected to the center of the rotating wheel 2, and the second end of the shaft 1 is used to insert into the outer nozzle of the PU material spraying equipment and coaxially connected to the lower part of the mixing head F, so that the shaft 1 and the mixing head F rotate coaxially.

[0037] The mixing chamber E is connected to one or more feed valves E01, allowing one or more PU raw materials to be injected into the mixing chamber E through one or more feed ports. The mixing chamber E can also be connected to cleaning valves and / or return valves to realize the circulation of PU raw materials and the cleaning of the equipment. The various valves are preferably pneumatic valves controlled by cylinders, which can be installed on the outer wall of the mixing chamber E.

[0038] The mixing head F extends axially along the main shaft B. One end of the mixing head F is fixed to the end of the main shaft B that extends into the mixing chamber E. The upper part of the mixing head F is located in the space of the mixing chamber E, and the lower part of the mixing head F is accommodated in the space of the outer sleeve nozzle G below the mixing chamber E.

[0039] Specifically, such as Figure 2 As shown, the mixing head F is cylindrical and includes a helical section F01, a vane section F02, and an inverted boss F03 arranged sequentially along the axial direction. The helical section F01 is located at the top of the mixing head F, and its cylindrical surface is uniformly covered with helical ridges. The vane section F02 is located below the helical section F01, and its cylindrical surface is uniformly arranged with multiple rows of vanes along the axial direction of the mixing head (six rows in this embodiment). The outer edges of the vanes are flush with the outer edges of the helical section F01. Each row of vanes includes multiple evenly spaced inclined vanes. The multiple vanes on the vane section F02 have the same shape and inclination direction, and the inclination direction of the vanes is approximately the same as the helical direction of the helical section F01 and the same as the raw material extrusion direction. The vanes are plate-shaped and can be flat or plate-like. Figure 2 The non-flat shape shown refers to the angle between the side axis of the blade adjacent to its cylindrical surface and the side axis of the blade away from its cylindrical surface, which is 0-15°. The mixing head F of this embodiment can rotate at high speed with the rotating splitter H, reaching a speed of 3000-8000 revolutions per minute.

[0040] The inverted protrusion F03 is located below the vane portion F02. The upper part of the helical portion F01 and the vane portion F02 of the mixing head F are located in the space of the mixing chamber E, and the lower part of the vane portion F02 of the mixing head F is accommodated in the space of the outer nozzle G, as shown. Figure 1-3 As shown.

[0041] The outer nozzle G has a mixing head accommodating space 11, the shape of which matches the shape of the mixing head F portion it accommodates. A gas flow passage 12 is located in the side wall of the outer nozzle G. The outlet 13 of the gas flow passage 12 is located in the bottom region of the outer nozzle. The inlet 14 of the gas flow passage 12 is connected to a gas source. The end 15 of the gas flow passage 12 is inclined downwards and connected to the outlet 13, allowing the airflow discharged through the outlet 23 to be directed downwards towards the PU material for spraying.

[0042] In a preferred embodiment, such as Figure 3 The gas flow passage 12 is an annular sandwich structure formed in the side wall of the outer nozzle G, and the gas outlet 13 is annular, located at the bottom of the outer nozzle, surrounding the outer side of the discharge port 16 of the outer nozzle G.

[0043] based on Figure 3 The embodiment shown can also be modified as follows, with the air outlet 13 disposed on the inner side wall of the discharge outlet 16 of the outer sleeve nozzle G.

[0044] like Figure 4-7 As shown, the rotating splitting wheel H includes a shaft 1, a rotating wheel 2, and a shaft limiting member 3. The first end of the shaft 1 is connected to the center of the rotating wheel 2, and the second end of the shaft 1 is inserted into the outer nozzle of the PU material spraying equipment and coaxially connected to the lower part of the mixing head F, preferably limited by the shaft limiting member 3, so that the shaft 1 rotates coaxially with the mixing head F. The rotating wheel 2 includes one or more wheel pieces 21, each wheel piece 21 including a central portion 22 and multiple teeth 23, the multiple teeth 23 being evenly connected on the outer peripheral edge of the central portion 22. The multiple wheel pieces 21 are coaxially overlapped, with the teeth 23 on one wheel piece 21 offset from the teeth 23 on at least another wheel piece 21 in the circumferential direction. This allows them to receive some PU material particles for side spraying. There are gaps in the circumferential direction between the teeth 23 of the multiple overlapping wheel pieces 21, so that the PU material particles sprayed from the outer nozzle of the PU material spraying equipment can fall onto the lower side of the rotating splitter wheel H, achieving bottom spraying.

[0045] During operation, the rotating splitting wheel H rotates coaxially with the mixing head F. Some PU material particles sprayed from the outer nozzle of the PU material spraying equipment fall onto the upper surface of the multiple teeth 23 of the wheel 21, passing through gaps between the teeth 23 to reach the lower surface of the teeth 23. Under centrifugal force, the PU material particles are separated and detached from the upper and lower sides of the multiple teeth 23, achieving side coating. Simultaneously, due to the gaps between the teeth 23, some PU material particles sprayed from the outer nozzle of the PU material spraying equipment can fall onto the lower side of the rotating splitting wheel H, achieving bottom coating.

[0046] Preferably, the teeth 23 on one wheel piece 21 are staggered in the circumferential direction from the teeth 23 on the other wheel pieces 21, so that the side spraying function can be achieved.

[0047] like Figure 4 As shown, in one embodiment of this utility model, the rotating wheel 2 includes a wheel piece 21, which includes six teeth 23. The teeth 23 are arc-shaped, with their arc-shaped arched portions in the width direction facing the rotation direction R of the wheel piece 21. Furthermore, to spray at different heights on the side, the teeth 23 have upward or downward arc-shaped bends in their length direction. Thus, under centrifugal force, PU material particles can bend along the arc-shaped bends of the teeth 23 in the length direction, separating and detaching towards the side at a certain bending angle, achieving spraying at different heights on the side. Those skilled in the art will understand that when the teeth 23 have upward or downward arc-shaped bends in the length direction, they are preferably arranged in pairs to ensure stable rotation. Figure 4 The wheel 21 includes a pair of teeth 23 with an upward arc bend in the length direction, a pair of teeth 23 with a downward arc bend in the length direction, and a pair of straight teeth 23.

[0048] like Figure 5 , 6As shown, in one embodiment of this utility model, the rotating wheel 2 includes multiple wheel pieces 21, and in this embodiment, there are two wheel pieces 21. The two wheel pieces 21 are coaxially overlapped and sleeved on the first end of the shaft 1. A washer 25 is spaced between adjacent wheel pieces 21. By selecting washers of different thicknesses, the distance between the wheel pieces 21 can be adjusted, thereby adjusting the spraying height of the side. The wheel piece 21 includes a central part 22 and two teeth 23. The two teeth 23 are evenly connected on the outer peripheral edge of the central part 22. The teeth 23 on one wheel piece 21 are staggered from the teeth 23 on the other wheel piece 21, so that all four teeth 23 can receive sprayed particles for side spraying. Furthermore, there is a gap between the four teeth 23 of the two overlapping wheel pieces 21, so that the PU material particles sprayed by the outer nozzle of the PU material spraying device can fall to the lower side of the rotating splitting wheel H, realizing the spraying of the bottom.

[0049] like Figure 7 As shown, in one embodiment of this utility model, the rotating wheel 2 includes a wheel piece 21, which includes five teeth 23. A dividing groove 24 is formed on the outer end face of the free end of the teeth 23, dividing the teeth 23 into upper and lower layers, thereby increasing the surface area for PU material particles to be ejected and optimizing the side spraying capability. The upper and lower surfaces of the teeth 23 form an acute angle on the shaft side. In this embodiment, the upper surface of the teeth 23 is inclined upward along the radial direction of the rotating wheel 2, and the lower surface of the teeth 23 is perpendicular to the shaft 1. Adjusting the acute angle can change the side spraying height.

[0050] As can be seen from the above embodiments, by setting the rotating splitting wheel H, the side spraying function can be realized. Users can set the corresponding rotating splitting wheel H according to the mold situation to achieve side spraying at different heights.

[0051] In operation, the PU material spraying equipment of this invention is vertically positioned. Motor A drives the main shaft B to rotate, which in turn drives the mixing head F to rotate the rotating splitter wheel H. Multiple PU raw materials (determined according to the product) enter the mixing chamber E through different material inlets. Under the rotation of the mixing head F, the PU raw materials are mixed in the space between the mixing chamber E and the outer nozzle G. The mixed PU material is then sprayed through the outer nozzle G towards the rotating splitter wheel H and the mold under the action of external airflow for foaming. Due to the rotating splitter wheel H, some of the PU material particles sprayed from the outer nozzle of the PU material spraying equipment fall onto the upper and lower surfaces of the multiple teeth of the wheel. Under the action of centrifugal force, the PU material is separated and thrown towards the side of the mold, achieving side spraying. Simultaneously, some PU material particles pass through the gaps between the teeth 23 and fall onto the lower side of the rotating splitter wheel H, achieving spraying of the bottom of the mold.

[0052] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0053] The embodiments of this utility model have been described above. However, this utility model is not limited to the above embodiments. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A rotating splitter wheel for a PU material spraying device, characterized in that, The rotating splitter wheel includes a shaft and a rotating wheel. The first end of the shaft is connected to the center of the rotary wheel, and the second end of the shaft is used to insert into the outer nozzle of the PU material spraying equipment and coaxially connected to the lower part of the mixing head, so that the shaft rotates coaxially with the mixing head; The rotating wheel includes one or more wheel pieces, each wheel piece including a central portion and a plurality of staggered teeth, the plurality of teeth being uniformly connected to the outer peripheral edge of the central portion; the plurality of wheel pieces are coaxially overlapped, the teeth on one wheel piece being staggered in the circumferential direction from the teeth on at least another wheel piece, for receiving a portion of PU material particles for side spraying; there are gaps in the circumferential direction between the teeth of the overlapping plurality of wheel pieces, allowing a portion of PU material particles to pass through the gaps and fall to the underside of the rotating wheel for bottom spraying.

2. The rotating splitter wheel of the PU material spraying equipment as described in claim 1, characterized in that, The teeth on one wheel are staggered from the teeth on the other wheels in the circumferential direction.

3. The rotating splitter wheel of the PU material spraying equipment as described in claim 1, characterized in that, The teeth are arc-shaped strips, and the arc-shaped arched portion of the teeth in the width direction faces the rotation direction of the wheel.

4. The rotating splitter wheel of the PU material spraying equipment as described in claim 1, characterized in that, The gear teeth have an upward or downward arc-shaped bend along their length.

5. The rotating splitter wheel of the PU material spraying equipment as described in claim 1, characterized in that, Multiple wheel pieces are coaxially overlapped and fitted onto the first end of the axle, with washers spaced between adjacent wheel pieces.

6. The rotating splitter wheel of the PU material spraying equipment as described in claim 1, characterized in that, A square-shaped dividing groove is formed on the outer end face of the free end of the gear tooth to divide the gear tooth into upper and lower layers; and / or, The upper and lower surfaces of the gear teeth form an acute angle on the shaft side.

7. A PU material spraying device, characterized in that, The PU material spraying equipment includes a mixing chamber, a mixing head, an outer nozzle, and a rotating dispersing wheel as described in any one of claims 1-6. The upper part of the mixing head is located in the space of the mixing chamber, and the lower part of the mixing head is accommodated in the space of the outer nozzle below the mixing chamber. The outer sleeve nozzle has a gas flow passage in its side wall, the outlet of the gas flow passage is located in the bottom area of ​​the outer sleeve nozzle, the inlet of the gas flow passage is used to connect to a gas source, and the end of the gas flow passage is inclined downward to connect to the outlet.

8. The PU material spraying equipment as described in claim 7, characterized in that, The gas flow passage is an annular sandwich structure formed in the sidewall of the outer nozzle, and the gas outlet is annular, located at the bottom of the outer nozzle, surrounding the outer side of the outlet of the outer nozzle; and / or, The air outlet is located on the inner side wall of the discharge port of the outer sleeve nozzle.

9. The PU material spraying equipment as described in claim 7, characterized in that, The mixing head is cylindrical and includes a spiral section, a vane section, and an inverted protrusion arranged sequentially along the axial direction. The spiral section is located at the top of the mixing head, and spiral protrusions are uniformly provided on its cylindrical surface; The wing section is located below the spiral section, and multiple rows of winglets are uniformly arranged along the axial direction of the mixing head on its cylindrical surface. The outer edge of the winglets is flush with the outer edge of the spiral section. Each row of winglets includes multiple inclined winglets arranged at uniform intervals. The multiple winglets on the wing section have the same shape and inclination direction, and the inclination direction of the winglets is approximately the same as the spiral direction of the spiral section. The mixing head and the rotating splitter rotate at 3000-8000 revolutions per minute.

10. The PU material spraying equipment as described in claim 9, characterized in that, The wing is plate-shaped, and the angle between the side axis of the wing adjacent to its cylindrical surface and the side axis of the wing away from its cylindrical surface is 0-15°.

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