A method and device for preparing self-skinning polyurethane products using polyether polyols

Abstract

The present invention discloses a method and apparatus for preparing self-skinning polyurethane products using polyether polyols, belonging to the technical field of polyurethane foam injection molding. The steps are as follows: preparing component A and component B and placing them in two storage tanks respectively; using a feed pipe to introduce component A and component B stored in the two storage tanks into a material cavity, and the materials are filtered and sequentially enter the feed trough and feed port to complete mixing; the mixed materials are injected into a molding mold through a nozzle to form a finished product. The method for preparing self-skinning polyurethane products using polyether polyols of the present invention can realize automated production operations; the present invention improves the high-pressure foaming machine, which, by providing an installation mechanism, facilitates the rapid installation and removal of the nozzle, and facilitates the disassembly and cleaning of the nozzle.

Description

Technical Field

[0001] The invention belongs to the technical field of polyurethane foam injection molding, and in particular relates to a method and a device for preparing self-skinning polyurethane products by using polyether polyol. Background Art

[0002] Integral skinning polyurethane is a high-performance material that simultaneously forms a dense skin and a porous core through a single injection molding process. The skin can accurately replicate the micron-level texture of the mold, enhancing the visual texture while giving the product scratch resistance and weather resistance. The core achieves lightweight and energy-absorbing properties through a closed-cell foam structure, and is widely used in high-value interior parts such as automotive products and armrests.

[0003] However, the high-pressure foaming machines used in the high-pressure injection process during the preparation of self-skinning polyurethane have the following problems in actual use: residual foaming material, impurities, or solidified materials easily accumulate in the injection section. If these impurities are ejected along with the new foaming material, they will be mixed into the final foamed product, causing defects such as uneven bubbles, voids, and impurity spots inside the product, seriously affecting the appearance quality and physical properties of the product. After the residual foaming material solidifies in the nozzle, it will become hard and rough. When the new foaming material passes through the nozzle at high speed, these solidified materials will cause friction and wear on the inner wall of the nozzle, causing the inner diameter of the nozzle to gradually increase or change its shape. This not only affects the nozzle's injection performance, but also shortens the nozzle's service life and increases the maintenance cost of the equipment. Regular cleaning of the injection section can remove these solidified materials, reduce wear on the nozzle, and thus ensure continuous production and optimize the injection effect. However, the nozzles of existing high-pressure foaming machines are inconvenient to disassemble, install, and position, making cleaning more difficult.

[0004] In this context, a process and device for preparing self-skinning polyurethane products from polyether polyols were developed, which can realize the fully automated production of self-skinning polyurethane products and improve the structure of key components of high-pressure foaming machines to facilitate disassembly, maintenance and cleaning operations. Summary of the Invention

[0005] The purpose of the present invention is to provide a method and apparatus for preparing self-skinning polyurethane products using polyether polyols in order to solve the technical problems mentioned in the background art.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A device for preparing self-skinning polyurethane products with polyether polyols includes a high-pressure foaming machine, which includes a base and a nozzle, the top of the base is fixedly connected to a storage tank and a movable frame, the movable frame is used to drive the nozzle to move, the bottom end of the nozzle is equipped with a nozzle, the two sides of the nozzle are symmetrically fixedly connected to a feed seat, the top of the feed seat is fixedly connected to a feed pipe, one end of the feed pipe is connected to the storage tank, feed ports are symmetrically provided on both sides of the nozzle, the bottom end of the feed seat is provided with a threaded groove, the inner wall of the threaded groove is threadedly connected to a threaded column, the top of the threaded column is provided with a filter screen, the interior of the feed seat is provided with a material cavity at the top of the threaded groove, a feed trough is provided on one side of the material cavity, the nozzle is installed in the interior of the nozzle through a mounting mechanism, and the inner wall of the feed trough is cleaned by a cleaning mechanism.

[0008] As a further solution of the present invention: the mounting mechanism includes a mounting groove, the mounting groove is opened at the bottom end of the nozzle, the inner wall of the mounting groove is slidably connected to a mounting plate, the nozzle and the mounting plate are internally provided with a connecting groove for installing the nozzle, the outer wall of the mounting plate is symmetrically fixedly connected with an insertion rod, the outer wall of the insertion rod is provided with a fixing groove, the inner wall of the mounting groove is symmetrically provided with a through groove, a positioning plate is provided on the side of the outer wall of the nozzle away from the mounting plate, the outer wall of the positioning plate is symmetrically provided with slots, the nozzle is fixedly connected with a cylinder on both sides of the nozzle and the mounting plate, and the nozzle and the mounting plate are internally provided with a circular hole for inserting the cylinder.

[0009] The top end face of said sliding panel also is provided with an interlocking structure, and the interlocking structure is fixed with a backing pin on the interlocking structure to interlock the ends of the sliding panel and the interlocking structure is fixed with a backing pin on the interlocking structure.

[0010] As a further solution of the present invention: the cleaning mechanism includes a cleaning hole, which is opened on the outer wall of the feed seat, and the cleaning hole is located on the side of the material chamber away from the feed trough, and the feed trough and the cleaning hole are at the same axial position, the bottom end of the threaded column is fixedly connected to a rotating cylinder, and the inner wall of the rotating cylinder is fixedly connected to a ring plate, and the interior of the feed seat is slidably connected to a baffle that passes through the cleaning hole, and the interior of the feed seat is located on the outer wall of the baffle. The baffle extends to the bottom of the feed seat, and the outer wall of the baffle is fixedly connected to a displacement plate, and the interior of the baffle is slidably connected to a block extending from the baffle, and a second spring is connected between the block and the baffle, and the interior of the baffle is slidably connected to a push frame extending from the baffle, and the push frame passes through the block.

[0011] As a further solution of the present invention: the outer wall of the cylinder fits with the inner wall of the circular hole, the outer wall of the nozzle fits with the inner wall of the connecting groove; the inner wall of the mounting groove fits with the outer wall of the mounting plate, and the inner walls of the through groove and the slot fit with the outer wall of the insertion rod.

[0012] As a further solution of the present invention: a threaded hole is opened at the top of the push plate, the threaded hole matches the threaded rod, the inner wall of the inclined groove fits with the outer wall of the slider, and the outer wall of the fixed plate fits with the inner wall of the fixed groove.

[0013] As a further solution of the present invention: the bottom outer wall of the reinforcement frame is in contact with the inner wall of the reinforcement groove.

[0014] As a further solution of the present invention: the pushing frame is composed of a vertical rod and a lower cross bar and is in an inverted T shape, and one end of the pushing frame extending upward from the baffle is connected to the upper cross bar; the bottom end of the blocking block is provided with a first inclined surface, and the first inclined surface is in contact with the lower cross bar of the pushing frame.

[0015] As a further solution of the present invention: a second inclined surface is provided on one end of the clamping block extending out of the baffle.

[0016] A method for preparing a self-skinning polyurethane product using polyether polyol, comprising the following steps:

[0017] Step 1: Prepare component A and component B and place them in two storage tanks respectively;

[0018] Step 2: Use the feed pipe to introduce component A and component B stored in the two storage tanks into the material cavity of the feed seat according to the preset ratio. The materials are filtered through the filter screen and then enter the feed trough. Then, they enter the feed port through the feed trough and complete mixing under pressure.

[0019] Step 3: The mixed material is finally ejected through a nozzle, and the ejected mixed material is injected into a molding die to be molded into a finished product. The mold is opened and the finished product is taken out to obtain a self-skinning polyurethane product.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The method for preparing self-skinning polyurethane products from polyether polyols of the present invention can realize automated production operations; the present invention improves the high-pressure foaming machine, which places the nozzle into the connecting groove by setting a mounting mechanism. At this time, the cylinder is inserted into the circular hole to position the nozzle, and then the mounting plate is installed into the mounting groove. At this time, the insertion rod passes through the through groove, and the positioning plate is connected to the outer wall of the insertion rod. The insertion rod passes through the slot so that the positioning plate fits the outer wall of the nozzle, and then the rotating block is rotated, and the fixed plate is displaced and inserted into the fixed groove to fix the insertion rod, which is convenient for rapid installation and disassembly of the nozzle and convenient for disassembly and cleaning of the nozzle.

[0022] 2. The improved high-pressure foaming machine is equipped with a cleaning mechanism. After removing the nozzle, the rotating cylinder drives the threaded column to rotate, and the threaded column is rotated out of the threaded groove. The displacement of the threaded column drives the rotating cylinder to move, and the displacement of the rotating cylinder drives the displacement of the annular plate. The displacement of the annular plate pushes the baffle downward through the block, and the downward displacement of the baffle exposes the cleaning hole. After removing the threaded column from the threaded groove, the filter can be replaced and cleaned. At this time, a through-hole needle can be directly inserted into the cleaning hole and the feed trough. This design facilitates the simultaneous cleaning of the two feed troughs, eliminating the need to clean the two feed troughs separately with a through-hole needle and then use a spray gun to clean them, improving cleaning efficiency and convenience. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the high-pressure foaming machine of the present invention;

[0024] Figure 2 This is a schematic structural diagram of the nozzle of the high-pressure foaming machine of the present invention;

[0025] Figure 3 This is a schematic diagram of the installation of the nozzle of the high-pressure foaming machine of the present invention;

[0026] Figure 4 This is a schematic diagram of the internal structure of the mounting plate of the high-pressure foaming machine of the present invention;

[0027] Figure 5 This is a schematic diagram of the installation of the rotating shaft of the high-pressure foaming machine of the present invention;

[0028] Figure 6 This is a schematic diagram of the internal structure of the positioning plate of the high-pressure foaming machine of the present invention;

[0029] Figure 7 This is a schematic diagram of the internal structure of the fixing plate of the high-pressure foaming machine of the present invention;

[0030] Figure 8 This is a schematic diagram of the installation of the filter screen of the high-pressure foaming machine of the present invention;

[0031] Figure 9 This is a schematic diagram of the internal structure of the threaded column of the high-pressure foaming machine of the present invention;

[0032] Figure 10 Schematic diagram of the internal structure of the nozzle of the high-pressure foaming machine of the present invention;

[0033] Figure 11 This is a schematic diagram of the internal structure of the baffle of the high-pressure foaming machine of the present invention.

[0034] In the figure: 1, base; 2, storage tank; 3, movable frame; 4, nozzle; 5, nozzle; 6, feed seat; 7, feed pipe; 8, mounting mechanism; 801, mounting groove; 802, mounting plate; 803, plug rod; 804, fixing groove; 805, through groove; 806, positioning plate; 807, slot; 808, cylinder; 809, round hole; 810, rotating block; 811, threaded rod; 812, push plate; 813, slider; 814, fixing plate; 815, inclined groove; 816, reinforcement groove; 817, screw rod; 818, screw rod; 819, screw rod; 820, screw rod; 821, screw rod; 822, screw rod; 823, screw rod; 824, screw rod; 825, screw rod; 826, screw rod; 827, screw rod; 828, screw rod; 829, screw rod; 830, screw rod; 831, screw rod; 832, screw rod; 833, screw rod; 834, screw rod; 835, screw rod; 836, screw rod; 837, screw rod; 838, screw rod; 839, screw rod; 840, screw rod; 841, screw rod; 842, screw rod; 843, screw rod; 844, screw rod; 845, screw rod; 846, screw rod; 847, screw rod; 848, screw rod; 849, screw rod; 850, screw rod; 851, screw rod; 852, screw rod; 853, screw rod; 854, screw rod; 855, screw rod; 856, screw rod; 857, screw rod; 858, screw rod; 7. Reinforcement frame; 818. First spring; 819. Rotating shaft; 820. Vertical plate; 821. Rotating disk; 822. Square block; 9. Cleaning mechanism; 901. Cleaning hole; 902. Rotating cylinder; 903. Annular plate; 904. Baffle; 905. Displacement groove; 906. Displacement plate; 907. Block; 908. Second spring; 909. Pushing frame; 10. Feed port; 11. Threaded groove; 12. Threaded column; 13. Filter screen; 14. Material chamber; 15. Feed trough; 16. Connecting groove. DETAILED DESCRIPTION

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0036] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and should not be understood as indicating or implying relative importance. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense, for example, they can be fixedly connected, detachably connected, or connected in one piece; they can be mechanically connected or electrically connected; they can be directly connected, or indirectly connected through an intermediate medium, or they can be internal connections between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. The following describes an embodiment of the present invention based on its overall structure.

[0037] Please refer to Figures 1 to 8 , a device for preparing self-skinning polyurethane products with polyether polyol, including a high-pressure foaming machine, the high-pressure foaming machine includes a base 1 and a nozzle 4, the top of the base 1 is fixedly connected to a storage tank 2 and a movable frame 3, the movable frame 3 is used to drive the nozzle 4 to move, and a nozzle 5 is installed at the bottom end of the nozzle 4, and a feeding seat 6 is symmetrically fixedly connected to the two sides of the nozzle 4, and a feeding pipe 7 is fixedly connected to the top of the feeding seat 6. One end of the feeding pipe 7 is connected to the storage tank 2, and a feeding port 10 is symmetrically provided on both sides of the nozzle 5, and a threaded groove 11 is provided at the bottom end of the feeding seat 6, and a threaded column 12 is threadedly connected to the inner wall of the threaded groove 11, and a filter screen 13 is installed at the top of the threaded column 12, and a material cavity 14 is provided inside the feeding seat 6 at the top of the threaded groove 11, and a feeding trough 15 is provided on one side of the material cavity 14. The nozzle 5 is installed inside the nozzle 4 through a mounting mechanism 8, and the inner wall of the feeding trough 15 is cleaned by a cleaning mechanism 9.

[0038] In this embodiment: the movable frame 3 drives the nozzle 4 to move, and the component A and component B materials stored in the two storage tanks 2 are transported into the material cavity 14 through the feed pipe 7. The materials are filtered through the filter screen 13 and enter the feed trough 15. Through the feed trough 15, they enter the feed port 10 and are mixed under pressure. Finally, they are sprayed out through the nozzle 5, and the sprayed mixed material is injected into the multi-station molding mold to be formed into a finished product.

[0039] After using the device for a period of time, the filter 13 can be disassembled by rotating the threaded column 12 to rotate the threaded column 12 out of the threaded groove 11. The displacement of the threaded column 12 drives the filter 13 to be displaced, so that the filter 13 can be cleaned and replaced.

[0040] Please refer to Figures 1 to 8 The mounting mechanism 8 includes a mounting groove 801, which is opened at the bottom end of the nozzle 4. The inner wall of the mounting groove 801 is slidably connected to the mounting plate 802. The inside of the nozzle 4 and the mounting plate 802 is provided with a connecting groove 16 for installing the nozzle 5. The outer wall of the mounting plate 802 is symmetrically fixedly connected with the insertion rod 803, and the outer wall of the insertion rod 803 is provided with a fixing groove 804. The inner wall of the mounting groove 801 is symmetrically provided with a through groove 805. A positioning plate 806 is provided on the side of the outer wall of the nozzle 4 away from the mounting plate 802, and a slot 807 is symmetrically provided on the outer wall of the positioning plate 806. The nozzle 5 is fixedly connected to the two sides of the nozzle 4 and the mounting plate 802 with a cylinder 808, and the inside of the nozzle 4 and the mounting plate 802 is provided with a circular hole 809 for inserting the cylinder 808.

[0041] The top of the positioning plate 806 is rotatably connected to a rotating block 810, the bottom of the rotating block 810 is fixedly connected to a threaded rod 811, the outer wall of the threaded rod 811 is slidably connected to a push plate 812, the push plate 812 is slidably connected to the inside of the positioning plate 806, the two ends of the push plate 812 are fixedly connected to a slider 813, the interior of the positioning plate 806 is located at the two ends of the push plate 812 and is slidably connected to a fixed plate 814, the outer wall of the fixed plate 814 is provided with an oblique groove 815, the slider 813 is slidably connected to the oblique groove The inner wall of 815 and the top of the fixed plate 814 are provided with a reinforcement groove 816, the interior of the positioning plate 806 is located above the fixed plate 814 and is slidably connected to a reinforcement frame 817, a first spring 818 is connected between the reinforcement frame 817 and the positioning plate 806, the interior of the nozzle 4 is located above the through groove 805 and is rotatably connected to a rotating shaft 819, the two ends of the rotating shaft 819 are respectively fixedly connected to a vertical plate 820 and a rotating disk 821, and the outer wall of the rotating disk 821 is fixedly connected to a square block 822.

[0042] In this embodiment, when installing the nozzle 5, the nozzle 5 is placed into the connecting groove 16. The cylinder 808 is inserted into the circular hole 809 to position the nozzle 5. The mounting plate 802 is then installed into the mounting groove 801. The insertion rod 803 passes through the through groove 805, and the positioning plate 806 is connected to the outer wall of the insertion rod 803. The insertion rod 803 passes through the slot 807, so that the positioning plate 806 fits the outer wall of the nozzle 4. The rotating block 810 is then rotated. The rotation of the rotating block 810 drives the threaded rod 811 to rotate. The rotation of the threaded rod 811 drives the push plate 812 to move. The push plate 812 moves and drives the slider 813 to slide in the inclined groove 815. The slider 813 moves and pushes the fixed plate 814 to move. The fixed plate 814 moves and inserts into the fixed groove 804, fixing the insertion rod 803, thereby fixing the mounting plate 802. At this time, the rotating disk 821 can be rotated. The rotating disk 821 rotates through the rotating shaft 8 19 drives the vertical plate 820 to continue to rotate synchronously, and the vertical plate 820 rotates until it faces downward. The vertical plate 820 contacts the outer wall of the mounting plate 802, preventing the mounting plate 802 from moving out of the mounting groove 801. At the same time, the rotation of the rotating disk 821 drives the square block 822 to move. The displacement of the square block 822 pushes the reinforcement frame 817 to move, squeezing the first spring 818. The reinforcement frame 817 moves and inserts into the reinforcement groove 816, fixing the fixing plate 814, thereby preventing the nozzle 5 from loosening during use. This design facilitates the rapid installation and removal of the nozzle 5 and is convenient for disassembly and cleaning of the nozzle 5.

[0043] Please refer to Figures 8 to 11 The cleaning mechanism 9 includes a cleaning hole 901, which is opened on the outer wall of the feed seat 6. The cleaning hole 901 is located on the side of the material chamber 14 away from the feed trough 15. The feed trough 15 and the cleaning hole 901 are at the same axial position. The bottom end of the threaded column 12 is fixedly connected to the rotating cylinder 902. The inner wall of the rotating cylinder 902 is fixedly connected to the annular plate 903. The interior of the feed seat 6 is slidably connected to a baffle 904 that passes through the cleaning hole 901. The inner wall of the feed seat 6 is fixedly connected to the baffle 904 that passes through the cleaning hole 901. A displacement groove 905 is provided on the outer wall of the baffle 904, and the baffle 904 extends to the bottom of the feed seat 6. The outer wall of the baffle 904 is fixedly connected to a displacement plate 906. The baffle 904 is internally slidably connected to a block 907 extending from the baffle 904. A second spring 908 is connected between the block 907 and the baffle 904. The baffle 904 is internally slidably connected to a push frame 909 extending from the baffle 904, and the push frame 909 passes through the block 907.

[0044] In this embodiment, when cleaning the nozzle 4, after removing the nozzle 5, the rotating cylinder 902 is rotated to drive the threaded column 12 to rotate, and the threaded column 12 is rotated out of the thread groove 11. The displacement of the threaded column 12 drives the rotating cylinder 902 to move, and the displacement of the rotating cylinder 902 drives the annular plate 903 to move. The annular plate 903 is located between the displacement plate 906 and the block 907. The displacement of the annular plate 903 drives the baffle 904 to move downward through the block 907. The baffle 904 moves downward to expose the cleaning hole 901. After that, the baffle 904 continues to move, pushing the extended end of the frame 909 and the displacement groove. 905, the bottom end of the inner wall contacts, preventing the push frame 909 from continuing to move with the baffle 904. At this time, the lower end of the push frame 909 squeezes and pushes the block 907 to move horizontally, squeezing the second spring 908. The block 907 moves and separates from the annular plate 903. The rotating cylinder 902 continues to rotate, and the threaded column 12 is removed from the threaded groove 11. At this time, the filter 13 can be replaced and cleaned, and a through-hole needle can be directly used to directly penetrate the cleaning hole 901 and the feed trough 15, and the residual material can be poked out from the other side, so that the two feed troughs 15 can be cleaned simultaneously. This design facilitates the simultaneous cleaning of the two feed troughs 15, and there is no need to clean the two feed troughs 15 separately with a through-hole needle and then use a spray gun for cleaning.

[0045] When the threaded column 12 is tightened into the threaded groove 11, the displacement of the threaded column 12 drives the annular plate 903 to displace through the rotating cylinder 902, and the displacement of the annular plate 903 pushes the baffle 904 to displace through the displacement plate 906, pushing the push frame 909 to separate from the displacement groove 905, and the block 907 is displaced and reset by the elastic force of the second spring 908, and the annular plate 903 is again located between the displacement plate 906 and the block 907. When the threaded column 12 is tightened into the threaded groove 11, the baffle 904 automatically closes the cleaning hole 901.

[0046] Please refer to Figures 2 to 8 The outer wall of the cylinder 808 fits with the inner wall of the circular hole 809, the outer wall of the nozzle 5 fits with the inner wall of the connecting groove 16, the inner wall of the mounting groove 801 fits with the outer wall of the mounting plate 802, and the inner walls of the through groove 805 and the slot 807 fit with the outer wall of the insertion rod 803.

[0047] In this embodiment: the nozzle 5 is placed into the connecting groove 16, and the cylinder 808 is inserted into the circular hole 809 to locate the position of the nozzle 5. Then the mounting plate 802 is installed into the mounting groove 801. At this time, the insertion rod 803 passes through the through groove 805, and the positioning plate 806 is connected to the outer wall of the insertion rod 803. The insertion rod 803 passes through the slot 807, so that the positioning plate 806 fits the outer wall of the nozzle 4.

[0048] Please refer to Figures 2 to 8 A threaded hole is provided at the top of the push plate 812 , which matches the threaded rod 811 , the inner wall of the inclined groove 815 fits with the outer wall of the slider 813 , and the outer wall of the fixing plate 814 fits with the inner wall of the fixing groove 804 .

[0049] In this embodiment: the rotating block 810 is rotated, and the rotating block 810 rotates to drive the threaded rod 811 to rotate, and the threaded rod 811 rotates to drive the push plate 812 to move, and the push plate 812 moves to drive the slider 813 to slide in the inclined groove 815, and the slider 813 moves to push the fixed plate 814 to move, and the fixed plate 814 moves and is inserted into the fixed groove 804 to fix the insertion rod 803, thereby fixing the mounting plate 802.

[0050] Please refer to Figures 2 to 8 The bottom outer wall of the reinforcement frame 817 is in contact with the inner wall of the reinforcement groove 816 .

[0051] In this embodiment: the rotating disk 821 is rotated, and the rotating disk 821 rotates and drives the vertical plate 820 to continue to rotate synchronously through the rotating shaft 819. The vertical plate 820 rotates until it faces downward, and the vertical plate 820 contacts the outer wall of the mounting plate 802 to prevent the mounting plate 802 from moving out of the mounting groove 801. At the same time, the rotating disk 821 rotates and drives the square block 822 to move. The displacement of the square block 822 pushes the reinforcement frame 817 to move, causing the first spring 818 to be squeezed. The reinforcement frame 817 is displaced and inserted into the reinforcement groove 816 to fix the fixed plate 814.

[0052] Please refer to Figures 8 to 11 The pushing frame 909 is composed of a vertical rod and a lower cross bar and is in an inverted T shape. The pushing frame 909 extends upward from one end of the baffle 904 and is connected to the upper cross bar; the bottom end of the block 907 is provided with a first inclined surface, which contacts the lower cross bar of the pushing frame 909.

[0053] In this embodiment: the threaded column 12 is rotated out of the threaded groove 11, and the displacement of the threaded column 12 drives the rotating cylinder 902 to move, and the displacement of the rotating cylinder 902 drives the annular plate 903 to move, and the annular plate 903 is located between the displacement plate 906 and the block 907. The displacement of the annular plate 903 pushes the baffle 904 downward through the block 907, and the baffle 904 moves downward to expose the cleaning hole 901. Then the baffle 904 continues to move until the upper cross bar of the pushing frame 909 contacts the bottom end of the inner wall of the displacement groove 905, preventing the pushing frame 909 from continuing to move with the baffle 904. The lower cross bar of the pushing frame 909 can squeeze and push the block 907 to move laterally, causing the second spring 908 to be squeezed, so that the block 907 is displaced and separated from the annular plate 903.

[0054] Please refer to Figures 8 to 11One end of the block 907 extending out of the baffle 904 is provided with a second inclined surface.

[0055] In this embodiment: when the threaded column 12 is tightened into the threaded groove 11, the displacement of the threaded column 12 drives the annular plate 903 to be displaced through the rotating cylinder 902. The annular plate 903 is displaced and contacts one end of the block 907, pushing the block 907 to be displaced into the baffle 904, causing the second spring 908 to be squeezed. When the annular plate 903 is separated from the block 907, the block 907 is displaced and reset by the elastic force of the second spring 908, and the annular plate 903 is located between the displacement plate 906 and the block 907.

[0056] A method for preparing a self-skinning polyurethane product using polyether polyol, comprising the following steps:

[0057] Step 1: Prepare component A and component B and place them in two storage tanks 2 respectively;

[0058] Step 2: Use the feed pipe 7 to introduce the components A and B stored in the two storage tanks 2 into the material cavity 14 of the feed seat 6 according to the preset ratio. The materials are filtered through the filter screen 13 and then enter the feed trough 15. Then, they enter the feed port 10 through the feed trough 15 and are mixed under pressure.

[0059] Step 3: The mixed materials are finally ejected through the nozzle 5, and the ejected mixed materials are injected into the molding die to be molded into a finished product. The mold is opened and the finished product is taken out to obtain a self-skinning polyurethane product.

[0060] It should be pointed out that the raw material ratio of component A and component B in the self-skinning polyurethane product prepared from polyether polyol and the specific molding parameters are existing technologies in this field. For details, please refer to the technical content described in the Chinese invention patent publication number CN102250313B, which will not be repeated here.

[0061] The above is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A device for preparing a self-skinning polyurethane product using polyether polyol, characterized in that: The invention comprises a high-pressure foaming machine, which comprises a base (1) and a nozzle (4), wherein the top of the base (1) is fixedly connected to a storage tank (2) and a movable frame (3), wherein the movable frame (3) is used to drive the nozzle (4) to move, wherein a nozzle (5) is installed at the bottom end of the nozzle (4), wherein both sides of the nozzle (4) are symmetrically fixedly connected to a feed seat (6), wherein the top end of the feed seat (6) is fixedly connected to a feed pipe (7), wherein one end of the feed pipe (7) is connected to the storage tank (2), and feed ports are symmetrically opened on both sides of the nozzle (5). (10), a thread groove (11) is provided at the bottom end of the feed seat (6), a threaded column (12) is threadedly connected to the inner wall of the thread groove (11), a filter screen (13) is installed at the top end of the threaded column (12), a material cavity (14) is provided inside the feed seat (6) at the top end of the thread groove (11), a feed groove (15) is provided on one side of the material cavity (14), the nozzle (5) is installed inside the nozzle (4) through the installation mechanism (8), and the inner wall of the feed groove (15) is cleaned by the cleaning mechanism (9); The mounting mechanism (8) includes a mounting groove (801), the mounting groove (801) is opened at the bottom end of the nozzle (4), the inner wall of the mounting groove (801) is slidably connected to a mounting plate (802), the nozzle (4) and the mounting plate (802) are provided with a connecting groove (16) for installing the nozzle (5), the outer wall of the mounting plate (802) is symmetrically fixedly connected to an insertion rod (803), the outer wall of the insertion rod (803) is provided with a fixing groove (804), and the mounting The inner wall of the groove (801) is symmetrically provided with through grooves (805), the outer wall of the nozzle (4) is provided with a positioning plate (806) on the side away from the mounting plate (802), the outer wall of the positioning plate (806) is symmetrically provided with slots (807), the nozzle (5) is fixedly connected with a cylinder (808) on both sides facing the nozzle (4) and the mounting plate (802), and the inside of the nozzle (4) and the mounting plate (802) is provided with a circular hole (809) for the cylinder (808) to be inserted.

2. The device for preparing a self-skinning polyurethane product using polyether polyol according to claim 1, characterized in that: The top end of the positioning plate (806) is rotatably connected to a rotating block (810), the bottom end of the rotating block (810) is fixedly connected to a threaded rod (811), the outer wall of the threaded rod (811) is slidably connected to a push plate (812), the push plate (812) is slidably connected to the inside of the positioning plate (806), the two ends of the push plate (812) are fixedly connected to sliders (813), the inside of the positioning plate (806) is located at the two ends of the push plate (812) and is slidably connected to a fixed plate (814), the outer wall of the fixed plate (814) is provided with an inclined groove (815), the slider (813) is slidably connected to the inclined groove (815), and the slider (813) is slidably connected to the inclined groove (815). The inner wall of the groove (815) is provided with a reinforcement groove (816) at the top of the fixing plate (814); the interior of the positioning plate (806) is located above the fixing plate (814) and is slidably connected to a reinforcement frame (817); a first spring (818) is connected between the reinforcement frame (817) and the positioning plate (806); the interior of the nozzle (4) is located above the through groove (805) and is rotatably connected to a rotating shaft (819); the two ends of the rotating shaft (819) are respectively fixedly connected to a vertical plate (820) and a rotating disk (821); and the outer wall of the rotating disk (821) is fixedly connected to a square block (822).

3. The device for preparing a self-skinning polyurethane product using polyether polyol according to claim 2, characterized in that: The cleaning mechanism (9) includes a cleaning hole (901), the cleaning hole (901) is opened on the outer wall of the feed seat (6), the cleaning hole (901) is located on the side of the material chamber (14) away from the feed trough (15), the feed trough (15) and the cleaning hole (901) are at the same axial position, the bottom end of the threaded column (12) is fixedly connected to the rotating cylinder (902), the inner wall of the rotating cylinder (902) is fixedly connected to the annular plate (903), the interior of the feed seat (6) is slidably connected to a baffle (904) that passes through the cleaning hole (901), and the inner wall of the feed seat (6) is fixedly connected to the baffle (904) that passes through the cleaning hole (901). A displacement groove (905) is provided on the outer wall of the baffle (904), the baffle (904) extends to the bottom of the feed seat (6), the outer wall of the baffle (904) is fixedly connected to a displacement plate (906), the interior of the baffle (904) is slidably connected to a clamping block (907) extending from the baffle (904), a second spring (908) is connected between the clamping block (907) and the baffle (904), the interior of the baffle (904) is slidably connected to a push frame (909) extending from the baffle (904), and the push frame (909) passes through the clamping block (907).

4. The device for preparing a self-skinning polyurethane product using polyether polyol according to claim 2, characterized in that: The outer wall of the cylinder (808) fits with the inner wall of the circular hole (809), and the outer wall of the nozzle (5) fits with the inner wall of the connecting groove (16); the inner wall of the mounting groove (801) fits with the outer wall of the mounting plate (802), and the inner walls of the through groove (805) and the slot (807) fit with the outer wall of the insertion rod (803).

5. The device for preparing a self-skinning polyurethane product using polyether polyol according to claim 2, characterized in that: A threaded hole is formed at the top of the push plate (812), and the threaded hole matches the threaded rod (811). The inner wall of the inclined groove (815) fits the outer wall of the slider (813), and the outer wall of the fixing plate (814) fits the inner wall of the fixing groove (804).

6. The device for preparing a self-skinning polyurethane product using polyether polyol according to claim 2, characterized in that: The bottom outer wall of the reinforcement frame (817) is in contact with the inner wall of the reinforcement groove (816).

7. The device for preparing a self-skinning polyurethane product using polyether polyol according to claim 3, characterized in that: The pushing frame (909) is composed of a vertical rod and a lower horizontal rod and is in an inverted T-shape. One end of the pushing frame (909) extending upward from the baffle (904) is connected to the upper horizontal rod. The bottom end of the clamping block (907) is provided with a first inclined surface, which contacts the lower horizontal rod of the pushing frame (909).

8. The device for preparing a self-skinning polyurethane product using polyether polyol according to claim 3, characterized in that: One end of the clamping block (907) extending out of the baffle (904) is provided with a second inclined surface.

9. A method for preparing an integral skin polyurethane product by using a device for preparing an integral skin polyurethane product using a polyether polyol according to any one of claims 1 to 8, characterized in that: The specific steps are as follows: Step 1: Prepare component A and component B and place them in two storage tanks (2) respectively; Step 2: Using the feed pipe (7), the components A and B stored in the two storage tanks (2) are introduced into the material cavity (14) of the feed seat (6) according to a preset ratio. The materials are filtered through the filter screen (13) and then enter the feed trough (15). Then, the materials enter the feed port (10) through the feed trough (15) and are mixed under pressure. Step 3: The mixed material is finally ejected through the nozzle (5), and the ejected mixed material is injected into the molding die to be molded into a finished product. The mold is opened and the finished product is taken out to obtain a self-skinning polyurethane product.

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