A high pressure foaming nozzle device

Abstract

The present invention relates to a high-pressure foaming nozzle device, comprising a TDI nozzle mechanism and a TDI input mechanism connected to the TDI nozzle mechanism, wherein the TDI nozzle mechanism comprises an inner input pipe and an outer input pipe arranged around the outer wall of the inner input pipe, a closed cavity is formed between the outer wall of the inner input pipe and the inner wall of the outer input pipe, the TDI input mechanism is conductively connected to the closed cavity, at least one frustum-shaped circular hole is provided on the inner input pipe, at least one piston is movably provided on the outer input pipe, the end of the piston is frustum-shaped and can abut against the closed circular hole, and the piston is connected to a transmission mechanism. The present invention relates to the field of sponge production devices, and TDI can be adjusted by the piston of the nozzle mechanism to form a high pressure and be mixed with other raw materials, thereby improving the mixing efficiency, making the TDI reaction more complete, saving costs, making the sponge pores finer, and improving the quality of the sponge, thereby solving the technical problems of incomplete low-pressure reaction of TDI and rough sponge structure.

Description

Technical Field

[0001] The invention relates to the field of sponge foaming production devices, in particular to a high-pressure foaming nozzle device. Background Art

[0002] The main raw materials for sponge foaming are: isocyanate, polyether polyol, water, auxiliary foaming agent MC, amine, organotin, silicone stabilizer, cross-linking agent, pore opener, flame retardant, yellowing agent, antioxidant, colorant, etc. Isocyanate is mainly used in soft foam sponge, TDI and modified MDI, or a mixture of the two, for the convenience of description, they are collectively referred to as TDI; polyether polyols also have two major categories, polyether polyols and grafted polyether polyols, each of which is divided into many varieties according to molecular weight, functionality and structure. In actual foaming, one or more are mixed, for the convenience of description, they are collectively referred to as PPG; water and other amines, organotin, silicone stabilizers, cross-linking agents, pore openers, flame retardants, yellowing agents, antioxidants, colorants, etc. are used in small amounts in the foaming formula ratio, and the volume of the raw material tank is relatively small. For the convenience of description, they are collectively referred to as small materials. At present, sponge foaming is mainly made of TDI, PPG, water, amine, organic tin, stabilizer, and other MC and small materials are selected according to needs. These raw materials are mixed and foamed in a mixer, and then output, flowing from the nozzle through a screen onto the foaming paper. Its existing structure can refer to the structure disclosed in a sponge continuous foaming machine disclosed in Chinese Patent No.: CN201610187064.6, and can also refer to the Chinese Patent No.: 201921530449.3 applied by the applicant, which discloses a sponge nozzle foaming device without a foam head and a bean hole.

[0003] The current process is to input PPG into each PPG input tank, input small materials into each small material input tank, and input TDI into the TDI input tank. According to the sequence of input time set by PLC, the materials are input into the mixer, mixed by stirring in the mixer, and then flow to the nozzle. The nozzle reciprocates left and right above the oven drop plate, which is lined with foam paper. The mixed material passes through the screen of the nozzle and is sprayed evenly onto the foam paper. The mixed material flows forward on the oven drop plate with a certain inclination. Through chemical reaction, the mixed material begins to turn white and the volume increases, thereby realizing the foaming of the raw materials and generating sponges. However, the input TDI pressure is low, generally less than 10kgf / cm2, and the mixing reaction with other raw materials is not sufficient. The utilization efficiency of TDI is not 100%. In addition, the pore structure of the sponge cannot be very fine due to the low TDI pressure. There are also TDI high-pressure nozzle devices on the market, but they are generally input directly from the top of the mixer. First, the number of installed nozzles is limited by the installation position and structure, and the number is generally not large, usually 2 to 3. Second, TDI pressure is generally adjusted pneumatically, and it takes a certain amount of time to adjust to the set TDI pressure. Third, TDI nozzles are easily blocked, and they need to be removed and cleaned for each production. Fourth, the mixed material flows vertically, and it is difficult for TDI to mix evenly with the mixed material immediately after it is sprayed out, and large bubbles are easily formed. Summary of the invention

[0004] Therefore, in view of the above problems, the present invention proposes a TDI high-pressure foaming nozzle device, which solves the technical problems of incomplete TDI low-pressure reaction and rough sponge structure.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A high-pressure foaming nozzle device comprises a TDI nozzle mechanism and a TDI input mechanism connected to the TDI nozzle mechanism, wherein the TDI nozzle mechanism comprises an inner input pipe and an outer input pipe arranged around the outer wall of the inner input pipe, a closed cavity is formed between the outer wall of the inner input pipe and the inner wall of the outer input pipe, the TDI input mechanism is conductively connected to the closed cavity, at least one circular hole is provided on the inner input pipe, at least one piston is movably provided on the outer input pipe, an end of the piston can abut against the closed circular hole, the piston is connected to a transmission mechanism, the transmission mechanism drives the piston to perform an opening and closing action relative to the circular hole, and the piston can adjust the size of the gap between the end of the piston and the circular hole.

[0007] Further:

[0008] The transmission mechanism includes a sleeve rotatably arranged on the external input pipe, the sleeve is arranged around the outer wall of the external input pipe, one end face of the sleeve is against the piston, the end face is provided with a spiral groove body, the piston is a guide rod, the external input pipe is provided with a guide groove, the guide rod is movably arranged in the guide groove, the guide rod is provided with at least one convex tooth, the convex tooth is inserted in the groove body, and the inward or outward movement of the guide rod is achieved by rotating the sleeve.

[0009] The number of turns of the groove body spiral is greater than the number of the convex teeth.

[0010] The TDI input mechanism includes a TDI tank, a TDI filter connected to the TDI tank, a TDI high-pressure pump connected to the TDI filter, a TDI high-pressure meter connected to the TDI high-pressure pump, and a three-way pipe connected to the TDI high-pressure meter, one end of the three-way pipe is connected to the TDI tank through a reflux valve, and the other end of the three-way pipe is connected to an external input pipeline through an input valve.

[0011] One end of the inner input pipeline is connected to the mixer, and the other end of the inner input pipeline is connected to at least one PPG input tank, a plurality of small material input tanks, and optionally one MC input tank.

[0012] It also includes a cleaning mechanism, which includes a pressure tank, which is respectively connected to an air source pipe valve, an exhaust pipe valve, a feed pipe valve, and a cleaning pipe valve. The air source pipe valve is connected to an air source, the feed pipe valve is connected to an MC input tank, and the cleaning pipe valve is connected to a pipe connecting the TDI input mechanism and an external input pipe.

[0013] The inner input pipeline is provided with valves on both sides of the outer input pipeline, and a mixing chamber is formed between the two valves.

[0014] The inner input pipeline is connected to a cleaning outlet, and the cleaning outlet is provided with a cleaning valve.

[0015] The number of the pistons is four, and the four pistons are arranged in sequence and equidistantly in a ring on the external input pipeline.

[0016] The circular hole is a frustum structure, and the end of the piston is a frustum structure.

[0017] The pressure of TDI in the external input pipeline can be adjusted by the piston on the external input pipeline, and can reach a maximum of less than 120kgf / cm2.

[0018] By adopting the above technical solution, the beneficial effects of the present invention are:

[0019] The piston is driven to move inward by rotating the sleeve, and the piston is driven to move inward to adjust the effective area of ​​the circular hole TDI flowing into the inner input pipe, thereby increasing the pressure of TDI in the outer input pipe, so that TDI flows into the inner input pipe in a spray mist state and mixes with PPG and other raw materials. The mixing is more complete, and the TDI reaction is more complete, which can save about 5% of TDI, save materials, reduce production costs, and improve the utilization rate of raw materials; high-pressure TDI is sprayed from the outer input pipe into the inner input pipe, and the high pressure changes to low pressure instantly, which can release a large amount of energy, form more bubbles, and make the sponge bubbles finer and more uniform, thereby improving the quality of the sponge; the sprayed TDI collides and mixes with the horizontally flowing PPG mixed material, firstly, the space is small, and secondly, the mixed material is horizontal, so that the TDI just sprayed can be completely mixed with the mixed material, reducing or eliminating bubble heads, reducing the waste of raw materials, and reducing costs; in the present invention, at least one or more pistons can be annularly provided on the outer input pipe, and according to the flow rate of TDI per minute, the piston can be partially or completely closed, so that when the required pressure is met, TDI can be completely mixed with the mixed material, and the TDI can be completely mixed with the mixed material, thereby ... the bubble head, reducing the waste of raw materials, and reducing costs; in the present invention, at least one or more pistons can be annularly provided on the outer input pipe, and according to the flow rate of TDI per minute, the piston can be partially or completely closed, so that when the required pressure is met, TDI can be I per minute flow range is larger, meeting the demand for producing more varieties of sponges; further, the transmission mechanism is a sleeve, and the sleeve is rotated manually or by a driving device to control the movement of the piston. A dial can be set on the sleeve. At a certain flow rate TD I, the required pressure can be adjusted by rotating the sleeve. In subsequent production, before foaming, the sleeve can be directly rotated to the scale of the last production to meet the production pressure, which can reduce the impact of the pressure adjustment period on the sponge quality; the present invention connects a cleaning outlet to the inner input pipeline. When the production is completed, the valves on both sides of the outer input pipeline on the inner input pipeline are closed, and the cleaning liquid MC flows from the outer input pipe through the gap between the piston and the circular hole into the inner input pipeline and is discharged from the cleaning outlet. Moreover, after cleaning, the cleaning valve is closed, and DOP can be injected into the outer input pipeline and the inner input pipeline to soak the piston and the circular hole for a long time, thereby ensuring that the gap between the piston and the circular hole will not be blocked. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the present invention;

[0021] Figure 2 yes Figure 1 A partial enlarged view of

[0022] Figure 3 It is a schematic diagram of the structure of the TDI nozzle mechanism;

[0023] Figure 4 It is a cross-sectional view of the TD I nozzle mechanism;

[0024] Figure 5 yes Figure 4 A partial enlarged view of

[0025] Figure 6 It is a cross-sectional view of the TD I nozzle mechanism from another angle;

[0026] Figure 7 It is a structural schematic diagram of the casing end face;

[0027] Figure 8 It is a schematic diagram of the structure of the TD I input mechanism;

[0028] Fig. 9 It is a structural diagram of the cleaning mechanism;

[0029] Fig.10 It is a structural schematic diagram of another application mode of the present invention;

[0030] Fig.11 It is a structural schematic diagram of another application mode of the present invention. DETAILED DESCRIPTION

[0031] The present invention will now be further described with reference to the accompanying drawings and specific implementation methods.

[0032] refer to Figures 1 to 9 The present embodiment provides a high-pressure foaming nozzle device, including a TDI nozzle mechanism 1, a TDI input mechanism 2 connected to the TDI nozzle mechanism 1, the TDI nozzle mechanism 1 includes an inner input pipe 11, an outer input pipe 12 arranged around the outer wall of the inner input pipe 11, one end of the inner input pipe 11 is connected to a mixer 3, and the other end of the inner input pipe 11 is connected to a PPG input tank 4, an MC input tank 5, and a plurality of small material input tanks 6. A closed cavity 10 is formed between the outer wall of the inner input pipe 11 and the inner wall of the outer input pipe 12. The TDI input mechanism 2 is conductively connected to the closed cavity 10. Four circular holes 111 are provided on the inner input pipe 11. The circular holes 111 are of a frustum structure. Four pistons 13 are movably provided on the outer input pipe 12. The ends of the pistons 13 are of a frustum structure. The four pistons 13 are arranged equidistantly in sequence on the outer input pipe 12. The ends of the pistons 13 can abut against the closed circular holes 111. The pistons 13 are connected to a transmission mechanism. The transmission mechanism drives the pistons 13 to open and close relative to the circular holes 111. The pistons 13 can adjust the effective area of ​​the circular holes 111 for the flow of TDI. The transmission mechanism includes a sleeve 14 rotatably arranged on the external input pipe 12, the sleeve 14 is arranged around the outer wall of the external input pipe 12, one end face of the sleeve 14 abuts against the piston 13, the end face is provided with a spiral groove body 141, the number of spiral turns of the groove body 141 is four, the piston 13 is a guide rod, the external input pipe 12 is provided with a guide groove 121, the guide rod is movably arranged in the guide groove 121, the guide rod is provided with two convex teeth 131, the convex teeth 131 are inserted in the groove body 141, and the inward or outward movement of the guide rod is realized by rotating the sleeve 14.

[0033] The TDI input mechanism 2 includes a TDI tank body 21, a TDI filter 22 connected to the TDI tank body 21, a TDI high-pressure pump 23 connected to the TDI filter 22, a TDI high-pressure meter 24 connected to the TDI high-pressure pump 23, and a three-way pipe connected to the TDI high-pressure meter 24, one end of the three-way pipe is connected to the TDI tank body 21 through a reflux valve 25, and the other end of the three-way pipe is connected to the external input pipeline 12 through an input valve 26 and a feed valve 27.

[0034] It also includes a cleaning mechanism 7, which includes a pressure tank 71, which is respectively connected to an air source pipe valve 72, an exhaust pipe valve 73, a feed pipe valve 74, and a cleaning pipe valve 75. The air source pipe valve 72 is connected to an air source 76, the feed pipe valve 74 is connected to the MC input tank 5, and the cleaning pipe valve 75 is connected to the pipe between the TDI feed valve 27 and the external input pipe 12. The internal input pipe 11 is provided with valves 112 on both sides of the external input pipe 12, and a mixing chamber 113 is formed between the two valves 112. The internal input pipe 11 is connected to a cleaning outlet 15, and the cleaning outlet 15 is provided with a valve 151, and the cleaning waste is directly discharged from the valve 151.

[0035] The TDI tank 21 has a constant temperature function. The TDI filter 22, the TDI high-pressure pump 23, and the TDI high-pressure meter 24 are well-known devices and will not be described in detail herein.

[0036] The circular hole 111 may also be other structures, and the end of the piston 13 may also be other structures. The end of the piston 13 may abut against the sealing hole 111, and the gap area between the piston and the hole may be changed by moving the piston inward and outward. It is usually set to a conical or frustum structure, which is set according to the specific situation.

[0037] The above-mentioned PPG input tank 4, MC input tank 5, and small material input tank 6 are well-known devices and will not be described in detail here.

[0038] In actual production, when the flow rate of TDI per minute is constant, the pressure of TDI in the closed cavity 10 is increased by adjusting the piston 13 to move inward and reducing the gap between the piston 13 and the circular hole 111. According to the production process requirements, the pressure is usually adjusted to 50-100kgf / cm2, and the maximum pressure does not exceed 120kgf / cm2, which is subject to actual production.

[0039] The number of the above-mentioned pistons 13 and the above-mentioned circular holes 111 can be one, two, three, four or even more, which can be set according to actual needs. The angles between adjacent pistons 13 can also be different, which can be set according to actual conditions. The sleeve 14 can also be omitted to drive the piston. The piston 13 can be driven by a cylinder, a servo cylinder, an electric or other device, and each piston 13 can be controlled independently or synchronously. The sleeve 14 can also be omitted to drive the piston. The piston 13 can be threadedly connected to the external input pipe 12, and the piston 13 can be moved inward or outward by rotating the piston 13, which is a well-known technology. The above-mentioned piston 13 can also be driven by other means, which can be set according to specific circumstances.

[0040] The number of the convex teeth 131 on the above-mentioned piston 13 is also one, two or even more, which is set according to the specific situation. The number of turns of the spiral of the above-mentioned groove body 141 can be two, three or even more turns, but the number of turns of the spiral of the groove body 141 is more than the number of the convex teeth 131, which is set according to the specific situation.

[0041] Reference Fig.10 , which is another application of the TDI nozzle mechanism. The TDI nozzle mechanism 1 can also be placed on the mixer 3. No valves are provided on the inner input pipe 11 on both sides of the outer input pipe. The inner input pipe 11 is directly connected to the mixing drum of the mixer 3. The inner diameter of the inner input pipe 11 is the same as the inner diameter of the mixing drum of the mixer 3. The inner input pipe and the mixer mixing drum are integrated.

[0042] refer to Fig.11 , which is another application mode of the TDI nozzle mechanism. The TDI nozzle mechanism 1 can also be set separately. The TDI nozzle mechanism 1 and other raw materials enter the mixer 3 separately and then are mixed. This mixing method is not as good as the mixing methods of the above two structures. It is set according to the specific situation.

[0043] The working mode of the present invention is:

[0044] According to the situation of the sponge, during the preparation period, adjust the temperature of each raw material, then start the circulation pump, PPG, MC, various small materials, and TDI for self-circulation, set the flow rate per minute of each raw material, when the temperature reaches the production requirement and the flow rates are stable, start the foaming switch, and according to the sequence set by the PLC, the two valves 112 are opened, and the valves of each raw material are changed from the circulation position to the foaming position. PPG, MC and various small materials enter the internal input pipeline 11, and at the same time, valves 26 and valve 27 are opened, and the reflux valve 25 is closed with a delay (the delay time can be set on the PLC according to the specific situation), TDI enters the closed cavity 10, and the rotating sleeve 14 drives the piston 13 to move inward, so that the gap between the round hole 111 and the cone at the end of the piston 13 becomes The pressure of TDI increases. When the pressure of TDI exceeds the production process requirement, the rotation of sleeve 14 is stopped; high-pressure TDI enters the inner input pipe 11 from the outer input pipe 12 through the circular hole 111, changes to low pressure, and is in a spraying state. The sprayed TDI is in a mist state, collides and mixes with the PPG mixed material in the pipe 11, and the mixed raw materials enter the mixer 3 for further stirring and mixing, so that the TDI is mixed more fully and the reaction is more complete, which improves the reaction rate of TDI, saves about 5% of TDI, reduces production costs, and improves the utilization rate of raw materials. In addition, the high-pressure TDI changes to low pressure, releases a large amount of energy, which is conducive to the formation of sponge pores. The sponge pores produced are more delicate and regular, thereby improving the quality of the sponge. After the foaming is completed, the valves of various raw materials are switched from the foaming position to the circulation position, and at the same time, the valve 112 is closed, and the valves 75 and 72 of the cleaning mechanism are opened (valves 73 and 74 must be closed). The cleaning liquid MC flows from the cavity 10 of the external input pipe through the gap between the piston 13 and the circular hole 111, into the cavity 113 of the internal input pipe, and is discharged from the cleaning valve 151. After the cleaning is completed, the cleaning valve 151 is closed, and DOP can be injected into the cavity 10 and the cavity 113 to soak the gap between the piston 13 and the circular hole 111 for a long time, thereby ensuring that the gap between the piston and the circular hole will not be blocked.

[0045] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, it should be understood by those skilled in the art that various changes may be made to the present invention in form and details without departing from the spirit and scope of the present invention as defined by the appended claims, all of which are within the scope of protection of the present invention.

Claims

1. A high-pressure foaming nozzle device, characterized in that: The invention comprises a TDI nozzle mechanism and a TDI input mechanism connected to the TDI nozzle mechanism, wherein the TDI nozzle mechanism comprises an inner input pipe and an outer input pipe arranged around the outer wall of the inner input pipe, a closed cavity is formed between the outer wall of the inner input pipe and the inner wall of the outer input pipe, the TDI input mechanism is conductively connected to the closed cavity, at least one circular hole is provided on the inner input pipe, at least one piston is movably provided on the outer input pipe, the end of the piston can abut against the closed circular hole, the piston is connected to a transmission mechanism, and the transmission mechanism is movable The plug performs an opening and closing action relative to the circular hole, and the piston can adjust the size of the gap between the piston end and the circular hole. The transmission mechanism includes a sleeve rotatably arranged on the external input pipe, and the sleeve is arranged on the outer wall of the external input pipe. One end face of the sleeve is against the piston, and the end face is provided with a spiral groove body. The piston is a guide rod, and a guide groove is provided on the external input pipe. The guide rod is movably arranged in the guide groove, and at least one convex tooth is provided on the guide rod, and the convex tooth is inserted in the groove body. The inward or outward movement of the guide rod is achieved by rotating the sleeve, and the circular hole is a frustum structure.

2. A high pressure foaming nozzle device according to claim 1, characterized in that: The number of turns of the groove body spiral is greater than the number of the convex teeth.

3. A high pressure foaming nozzle device according to claim 1, characterized in that: The TDI input mechanism includes a TDI tank, a TDI filter connected to the TDI tank, a TDI high-pressure pump connected to the TDI filter, a TDI high-pressure meter connected to the TDI high-pressure pump, and a three-way pipe connected to the TDI high-pressure meter, one end of the three-way pipe is connected to the TDI tank through a reflux valve, and the other end of the three-way pipe is connected to an external input pipeline through an input valve.

4. A high pressure foaming nozzle device according to claim 1, characterized in that: One end of the inner input pipeline is connected to the mixer, and the other end of the inner input pipeline is connected to at least one PPG input tank, a plurality of small material input tanks, and optionally one MC input tank.

5. A high pressure foaming nozzle device according to claim 4, characterized in that: It also includes a cleaning mechanism, which includes a pressure tank, which is respectively connected to an air source pipe valve, an exhaust pipe valve, a feed pipe valve, and a cleaning pipe valve. The air source pipe valve is connected to an air source, the feed pipe valve is connected to an MC input tank, and the cleaning pipe valve is connected to a pipe connecting the TDI input mechanism and an external input pipe.

6. A high pressure foaming nozzle device according to claim 1, characterized in that: The inner input pipeline is provided with valves on both sides of the outer input pipeline, and a mixing chamber is formed between the two valves.

7. A high pressure foaming nozzle device according to claim 6, characterized in that: The inner input pipeline is connected to a cleaning outlet, and the cleaning outlet is provided with a cleaning valve.

8. A high pressure foaming nozzle device according to claim 1, characterized in that: The number of the pistons is four, and the four pistons are arranged in sequence and equidistantly in a ring on the external input pipeline.

9. A high pressure foaming nozzle device according to claim 1, characterized in that: The end of the piston is a frustum structure.

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