Preparation method of high-density microporous polyurethane foam

Abstract

The invention relates to the technical field of polyurethane foam production, in particular to a preparation method of high-density microporous polyurethane foam, related calendering equipment comprises a base and a supporting plate fixedly connected to the upper surface of the base, and the supporting plate and the base are jointly provided with a pressing mechanism used for limiting the extension width of the foam. The calendaring equipment further comprises a calendaring mechanism used for calendaring foam, the calendaring mechanism is arranged on the base, a displacement track is fixedly connected to the position, located on the left side of the calendaring mechanism, of the base, and a mixing head is connected to the displacement track in a left-right sliding mode. By limiting the front ends and the rear ends of the upper PET base material and the lower PET base material, redundant materials on the edges can be reduced after the foam is formed, meanwhile, the reserved width of the PET base materials is reduced, the basic quantity of raw materials can be reduced, meanwhile, the use of the PET base materials is reduced, and the purpose of saving the production cost is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of polyurethane foam production, in particular to a method for preparing high-density microporous polyurethane foam. Background Art

[0002] High-density microporous polyurethane foam is a polymer material with excellent performance and is a type of polyurethane foam. During the production process of high-density microporous polyurethane foam, isocyanate and polyol undergo a chemical reaction under the action of catalysts, foaming agents, foam stabilizers and other additives. Isocyanate reacts with the hydroxyl groups in the polyol to form a polymerization reaction. When the polymerization reaction reaches a certain extent, the polymer chains are cross-linked to form a three-dimensional network structure.

[0003] During the foaming reaction, the calendering equipment is used to control the thickness and width of the foaming material to be cured, and finally high-density microporous polyurethane foam is formed. After the edges are neatly cut by the cutting equipment, the cut high-density microporous polyurethane foam is rolled up by the winding equipment.

[0004] Usually, when the thickness and width of the foam body are controlled by calendering equipment, the calendering will squeeze the foaming material to both sides. After the foaming material is shaped, the edges on both sides will be uneven. Since the two sides are free to overflow, in order to ensure that the required width of the foam is achieved, more foaming material is required to be calendered when producing the foam, so as to ensure that the remaining foam width can meet the required width after the uneven edges of the cut foam are cut. At the same time, in conjunction with the overflow of the foaming material, a wider PET substrate is required to avoid leakage of the foaming material. When a large number of foams are produced, the production cost of the factory will be higher; at the same time, when producing foams of different widths, different types of equipment are usually used for production, resulting in the need to use multiple equipment when producing foams of different widths. When adapting to the production of foams of various widths, the factory needs to add more production equipment of different specifications, which increases the production cost of the factory. Summary of the invention

[0005] Therefore, the present invention provides a method for preparing high-density microporous polyurethane foam, which solves the above technical problems.

[0006] The present invention provides a method for preparing high-density microporous polyurethane foam, comprising the following steps: S1, raw material preparation: preparing polyol, isocyanate, catalyst, foaming agent and surfactant as needed.

[0007] S2. Premixing: Add polyol, catalyst, foaming agent and surfactant into a stirring device according to proportion, and fully mix various raw materials together to obtain mixed raw materials.

[0008] S3, raw material loading: add the mixed raw material obtained in step S2 into raw material storage tank A, and add the isocyanate prepared in step S1 into raw material tank B.

[0009] S4, mixed foaming: the raw materials in tank A and tank B are preheated in proportion and then transported to the foaming equipment, and the raw materials in tank A and tank B are quickly mixed together by the foaming equipment to form a foaming material.

[0010] S5. Calendering and shaping: After the mixing head mixes the raw materials together, the foaming material is immediately transported to the PET substrate of the calendering equipment. The foaming material begins to foam and is calendered and shaped by the calendering equipment to obtain high-density microporous polyurethane foam.

[0011] S6, trimming and rolling: after the edges of the high-density microporous polyurethane foam obtained in step S5 are trimmed neatly by a cutting device, the high-density microporous polyurethane foam is rolled up by a rolling device.

[0012] The calendering equipment involved in the above-mentioned step S5 includes a base and a support plate fixedly connected to the upper surface of the base, and the support plate and the base are jointly provided with a clamping mechanism for limiting the extension width of the foam. The calendering equipment also includes a calendering mechanism for calendering the foam, and the calendering mechanism is arranged on the base. A displacement track is fixedly connected on the base and located on the left side of the calendering mechanism, and a mixing head is slidably connected to the displacement track along the front-rear direction.

[0013] The clamping mechanism includes a first adjusting member commonly arranged on the base and the support plate, the first adjusting member is provided with two groups of front-to-back symmetrical inverted L-shaped linkage rods, and the opposite surfaces of the two groups of inverted L-shaped linkage rods are provided with clamping members for clamping the edge of the PET substrate.

[0014] The clamping member includes a mounting plate fixedly connected to the horizontal sections of three inverted L-shaped linkage rods distributed on the left and right, two toothed synchronous wheels distributed on the left and right are rotatably connected to the opposite surfaces of the two mounting plates, and a toothed belt is rotatably connected to the two toothed synchronous wheels distributed on the left and right, and two symmetrical inverted L-shaped fixing plates are fixedly connected to the upper surface of the mounting plate, and a clamping plate for clamping the lower side of the toothed belt is provided on the side of the mounting plate close to the center of the support plate for sliding up and down.

[0015] The extended width of the foam is limited by two pressing members, and the excess material is pushed to the right by cooperating with the calendering mechanism. At the same time, the calendering width of the calendering mechanism is adjusted by the first adjusting member.

[0016] According to an embodiment of the present invention, two left-right symmetrical connecting ear plates are provided on one side of the clamping plate close to the center of the support plate, and the two connecting ear plates distributed on the left and right correspond one-to-one to the two elastic telescopic connecting columns distributed on the left and right, and the connecting ear plates penetrate the mounting plate and are fixedly connected to the bottom end of the corresponding elastic telescopic connecting column.

[0017] According to an embodiment of the present invention, a clamping groove is opened on the inner ring surface of the toothed belt, and the pressure plate is rotatably connected to a surface close to the center of the support plate with a plurality of auxiliary rollers evenly distributed in the left and right directions. The auxiliary rollers change the sliding friction between the pressure plate and the inner side of the toothed belt into rolling friction.

[0018] According to an embodiment of the present invention, the first adjusting member includes a plurality of evenly distributed elastic telescopic support platforms fixedly connected to the upper surface of the base, the top ends of the plurality of elastic telescopic support platforms are commonly fixedly connected to a fixed connecting plate, a bidirectional electric telescopic rod is fixedly connected to the middle position of the lower surface of the fixed connecting plate, and telescopic connecting rods are fixedly connected to the lower surface of the fixed connecting plate and on the left and right sides of the bidirectional electric telescopic rod.

[0019] According to an embodiment of the present invention, a slope surface inclined along the left and right directions is arranged at the middle position of the upper surface of the fixed connecting plate, a connecting groove is provided on the lower surface of the supporting plate, an extrusion plate is provided inside the connecting groove for sliding along the left and right directions, and a slope surface inclined along the left and right directions is also arranged on the lower surface of the extrusion plate, and the slope surface on the fixed connecting plate is inclined in the opposite direction to the slope surface on the extrusion plate and slides in cooperation with each other.

[0020] According to an embodiment of the present invention, the vertical sections of the two middle inverted L-shaped linkage rods distributed front and back are respectively fixedly connected to the front and back ends of the bidirectional electric telescopic rod, and the vertical sections of the two inverted L-shaped linkage rods distributed front and back on the left and right sides are respectively fixedly connected to the front and back ends of the two telescopic connecting rods.

[0021] According to an embodiment of the present invention, the calendering mechanism includes a gate-shaped mounting frame fixedly connected to a base, and mounting grooves in the up-and-down directions are provided on both vertical sections of the gate-shaped mounting frame, and mounting sliders are slidably connected inside the mounting grooves along the up-and-down directions, a calendering roller is rotatably arranged on the inner side of the gate-shaped mounting frame, and extension rollers are clamped at both the front and rear ends of the calendering roller, and a connecting piece for pressing the extension roller and the calendering roller is arranged on the horizontal section of the gate-shaped mounting frame, and a second adjusting piece for adjusting the height of the calendering roller and the extension roller is arranged in the middle position of the horizontal section of the gate-shaped mounting frame.

[0022] According to an embodiment of the present invention, the connecting member includes two front-to-back symmetrical sliding sleeves that are slidably connected to the horizontal section of the door-shaped mounting frame along the front-to-back direction, the upper surface of the sliding sleeve slides along the up-down direction and is penetrated by two left-right symmetrical limiting sliding rods, the bottom ends of the two limiting sliding rods distributed on the left and right are commonly fixedly connected to a connecting plate, and connecting rollers are rotatably connected to the opposite surfaces of the two connecting plates.

[0023] According to an embodiment of the present invention, the second adjusting member includes two front-to-rear symmetrical synchronous sliding rods that slide up and down and penetrate and are connected to the horizontal section of the gate-shaped mounting frame. The bottom ends of the two synchronous sliding rods are commonly fixedly connected to a bidirectional hydraulic telescopic cylinder. The upper surface of the horizontal section of the gate-shaped mounting frame is fixedly connected to a unidirectional electric telescopic rod through a mounting sleeve. The telescopic end of the unidirectional electric telescopic rod penetrates the horizontal section of the gate-shaped mounting frame and is fixedly connected to the upper surface of the bidirectional hydraulic telescopic cylinder.

[0024] According to an embodiment of the present invention, a scale is provided on the synchronous sliding bar.

[0025] Beneficial effects: 1. Through the setting of the clamping mechanism, when the foaming material is calendered, by limiting the front and rear ends of the upper and lower layers of PET substrates, the generation of excess material on the edge of the foam can be reduced after molding, and the reserved width of the PET substrate can be reduced, which can reduce the basic amount of raw materials and the use of PET substrates, thereby achieving the purpose of saving production costs.

[0026] 2. The calendering mechanism can be combined with the inverted L-shaped linkage rod to enable the equipment to calender foam of various widths, thereby improving the applicability of the equipment, reducing the factory's investment in production equipment, and thus reducing the factory's production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0028] Figure 1 The present invention is a flow chart of a method for preparing high-density microporous polyurethane foam.

[0029] Figure 2 It is a schematic diagram of the three-dimensional structure of the calendering equipment involved in the preparation method of the high-density microporous polyurethane foam provided by the present invention.

[0030] Figure 3 It is a three-dimensional structural schematic diagram of the calendering mechanism provided by the present invention.

[0031] Figure 4 It is one of the three-dimensional structural schematic diagrams of the extension roller provided by the present invention.

[0032] Figure 5 This is the second schematic diagram of the three-dimensional structure of the extension roller provided by the present invention.

[0033] Figure 6 It is a three-dimensional structural schematic diagram of the clamping mechanism provided by the present invention.

[0034] Figure 7 The present invention provides Figure 6 Enlarged view of part A.

[0035] Figure 8 It is a schematic diagram of the three-dimensional structure of the pressing piece provided by the present invention.

[0036] Fig. 9 It is a schematic diagram of the three-dimensional structure of a partial cross-section of the pressing member provided by the present invention from another viewing angle.

[0037] Fig.10 It is a schematic diagram of the three-dimensional structure of the first adjusting member provided by the present invention.

[0038] Fig.11 The present invention provides Fig.10 main view.

[0039] Reference numerals: 1, base; 2, support plate; 3, clamping mechanism; 4, calendering mechanism; 5, displacement track; 6, mixing head; 7, travel switch; 8, mounting slide; 31, inverted L-shaped linkage rod; 32, first adjusting member; 33, clamping member; 41, connecting member; 42, calendering roller; 43, extension roller; 44, door-shaped mounting frame; 45, second adjusting member; 321, two-way electric telescopic rod; 322, telescopic connecting rod; 323, elastic telescopic support platform; 32 4. Fixed connecting plate; 325. Electric push rod; 326. Extrusion plate; 331. Toothed belt; 332. Inverted L-shaped fixed plate; 333. Mounting plate; 334. Elastic telescopic connecting column; 335. Pressing plate; 336. Auxiliary roller; 337. Toothed synchronous wheel; 411. Connecting plate; 412. Sliding sleeve; 413. Limiting slide rod; 414. Connecting roller; 451. Bidirectional hydraulic telescopic cylinder; 452. Unidirectional electric telescopic rod; 453. Synchronous slide rod. DETAILED DESCRIPTION

[0040] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0041] like Figure 1 and Figure 2 As shown, a method for preparing high-density microporous polyurethane foam comprises the following steps: S1, raw material preparation: polyol, isocyanate, catalyst, foaming agent and surfactant are prepared as needed.

[0042] S2, premixing: adding polyol, catalyst, foaming agent and surfactant into a stirring device (the stirring device is a prior art) according to proportion, and fully mixing various raw materials together to obtain mixed raw materials.

[0043] S3, raw material loading: add the mixed raw material obtained in step S2 into raw material storage tank A, and add the isocyanate prepared in step S1 into raw material tank B.

[0044] S4, mixing and foaming: the raw materials in tank A and tank B are preheated in proportion and then transported to the foaming equipment (the foaming equipment is the prior art), and the raw materials in tank A and tank B are quickly mixed together by the foaming equipment to form a foaming material.

[0045] S5. Calendering and shaping: After the mixing head mixes the raw materials together, the foaming material is immediately transported to the PET substrate of the calendering equipment. The foaming material begins to foam and is calendered and shaped by the calendering equipment to obtain high-density microporous polyurethane foam.

[0046] S6, trimming and rolling: after the edges of the high-density microporous polyurethane foam obtained in step S5 are trimmed neatly by a cutting device (the cutting device is the prior art), the high-density microporous polyurethane foam is rolled up by a rolling device (the rolling device is the prior art).

[0047] The calendering equipment involved in the above-mentioned step S5 includes a base 1 and a support plate 2 fixedly connected to the upper surface of the base 1, and the support plate 2 and the base 1 are jointly provided with a clamping mechanism 3 for limiting the extension width of the foam. The calendering equipment also includes a calendering mechanism 4 for calendering the foam, and the calendering mechanism 4 is arranged on the base 1. A displacement track 5 is fixedly connected to the base 1 and located on the left side of the calendering mechanism 4. A mixing head 6 is slidably connected to the displacement track 5 along the front and rear directions through an electric slider, and the mixing head 6 is connected to an external feed pipeline. The clamping mechanism 3 is provided with two front-to-back symmetrical travel switches 7, and the travel switch 7 controls the moving direction of the electric slider. The travel switch 7 is the prior art.

[0048] like Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the calendering mechanism 4 includes a gate-shaped mounting frame 44 fixedly connected to the base 1, a calendering roller 42 is rotatably arranged on the inner side of the gate-shaped mounting frame 44, and extension rollers 43 are clamped at the front and rear ends of the calendering roller 42, a spline groove is provided on one side of the extension roller 43, and a spline pin is fixedly connected on the other side, the spline grooves on two adjacent extension rollers 43 are clamped with the spline pin, a connecting piece 41 for pressing the extension roller 43 and the calendering roller 42 is arranged on the horizontal section of the gate-shaped mounting frame 44, and a second adjusting piece 45 for adjusting the height of the calendering roller 42 and the extension roller 43 is arranged in the middle position of the horizontal section of the gate-shaped mounting frame 44.

[0049] During specific use, first adjust the number of extension rollers 43 between the connecting piece 41 and the calendering roller 42 according to the width of the foam to be calendered, and then snap the spline groove of the extension roller 43 onto the connecting shaft on the calendering roller 42. When installing multiple extension rollers 43, the spline grooves and spline pins between adjacent extension rollers 43 are snap-fitted with each other, so that the multiple extension rollers 43 are snap-fitted and connected, and spliced ​​on the calendering roller 42. After all the extension rollers 43 are installed on the calendering roller 42, and the number of extension rollers 43 on the front and rear sides of the calendering roller 42 is the same, then the second adjusting piece 45 is used to cooperate with the connecting piece 41 to clamp the multiple extension rollers 43 and the calendering roller 42, so that the multiple extension rollers 43 are coaxial with the calendering roller 42 and there is no gap between the circumferential surfaces. Then, the spacing between the calendering roller 42 and the upper surface of the support plate 2 is adjusted by the second adjusting piece 45 according to the thickness of the produced foam.

[0050] like Figure 3 , Figure 4 and Figure 5As shown, the connecting member 41 includes two front-to-back symmetrical sliding sleeves 412 that are slidably connected to the horizontal section of the door-shaped mounting frame 44 along the front-to-back direction. The upper surface of the sliding sleeve 412 slides along the up-down direction and is penetrated by two left-right symmetrical limiting slide bars 413. The bottom ends of the two left-to-right distributed limiting slide bars 413 are commonly fixedly connected to a connecting plate 411. The two connecting plates 411 are rotatably connected to connecting rollers 414 on opposite surfaces. The external drive drives the front connecting roller 414 to rotate on its corresponding connecting plate 411. A connecting groove that is compatible with the splined pin on the extension roller 43 is provided on the connecting roller 414. A clamping shaft that is compatible with the splined groove on the extension roller 43 is provided on the calendering roller 42. The connecting member 41, the calendering roller 42 and the extension roller 43 are coaxial.

[0051] like Figure 3 , Figure 4 and Figure 5 As shown, the second adjusting member 45 includes two front-to-rear symmetrical synchronous slide bars 453 which slide up and down and penetrate and are connected to the horizontal section of the gate-shaped mounting frame 44. The synchronous slide bars 453 are provided with scales (not shown in the figure). The bottom ends of the two synchronous slide bars 453 are commonly fixedly connected to a two-way hydraulic telescopic cylinder 451. The front and rear telescopic ends of the two-way hydraulic telescopic cylinder 451 are respectively fixedly connected to the front and rear connecting plates 411. The upper surface of the horizontal section of the gate-shaped mounting frame 44 is fixedly connected to a unidirectional electric telescopic rod 452 through a mounting sleeve. The telescopic end of the unidirectional electric telescopic rod 452 penetrates the horizontal section of the gate-shaped mounting frame 44 and is fixedly connected to the upper surface of the two-way hydraulic telescopic cylinder 451.

[0052] In specific use, when adjusting the number of extension rollers 43 between the connecting piece 41 and the calendering roller 42, first, the bidirectional hydraulic telescopic cylinder 451 bidirectionally extends through the connecting plate 411 to drive the connecting roller 414 away from the calendering roller 42, and at the same time, the sliding sleeve 412 slides on the door-shaped mounting frame 44 along with the connecting plate 411. Then, after all the extension rollers 43 are installed, the bidirectional hydraulic telescopic cylinder 451 is bidirectionally contracted to drive the connecting roller 414 to approach the extension roller 43, and the connecting groove on the connecting roller 414 is engaged with the spline bayonet pin on the extension roller 43. After the extension roller 43 and the calendering roller 42 are clamped, the bidirectional hydraulic telescopic cylinder 451 is stopped. Bidirectional contraction, at this time, the connecting roller 414, the calendering roller 42 and the extension roller 43 together form a coaxial splicing roller, and then the unidirectional electric telescopic rod 452 is contracted to drive the coaxial splicing roller to move upward and break away from the support of the support plate 2. The distance between the coaxial splicing roller and the support plate 2 is adjusted according to the thickness of the produced foam. Through the setting of the limiting slide bar 413, when the connecting plate 411 drives the coaxial splicing roller to move in the up and down directions, the limiting slide bar 413 limits the moving direction of the coaxial splicing roller, so that the coaxial splicing roller maintains the vertical movement, thereby avoiding the deviation of the coaxial splicing roller and affecting the subsequent calendering effect of the foaming material.

[0053] like Figure 2 and Figure 6 As shown, the clamping mechanism 3 includes a first adjusting member 32 commonly provided on the base 1 and the support plate 2, and two groups of front-to-back symmetrical inverted L-shaped linkage rods 31 are provided on the first adjusting member 32, and the number of each group of inverted L-shaped linkage rods 31 is three and they are evenly distributed along the left-right direction, and clamping members 33 for clamping the edge of the PET substrate are provided on the opposite surfaces of the two groups of inverted L-shaped linkage rods 31.

[0054] During specific use, after the extension roller 43 and the calendering roller 42 are spliced ​​according to the width of the foam product, the first adjusting member 32 adjusts the relative distance between the two clamping members 33 through the inverted L-shaped linkage rod 31 according to the width of the foam product, so that the distance between the opposite surfaces of the two clamping members 33 is the same as the width of the foam product. At the same time, the two clamping members 33 drive the two travel switches 7 to move during the movement, so that the distance between the two travel switches 7 is adapted to the width of the foam product (since the foaming material needs to be calendered to expand to the front and rear sides, the distance between the two travel switches 7 is smaller than the width of the foam product). After the adjustment is completed, the upper and lower PET substrates are simultaneously passed through the calendering roller 42 and the support plate 2, and the front and rear edges of the PET substrate are aligned with the opposite sides of the two clamping members 33. After passing through the calendering roller 42 and the support plate 2, the right ends of the two layers of PET substrate are fixed on the winding device, and the PET substrate is wound up by the winding device, generating a rightward pulling force on the PET substrate.

[0055] The PET substrate on the upper side is input from top to bottom and is in a vertical state with the pressing member 33, and the PET substrate on the lower side is input from left to right and is in a parallel state with the support plate 2. At this time, the two layers of PET substrate are in an open state on the left side of the support plate 2 and located at the lower part of the mixing head 6. When the winding device drives the two layers of PET substrate to move to the right, the mixing head 6 starts to move on the displacement track 5 to extrude the foaming material at the opening position of the two layers of PET substrate. Through the setting of the front and rear travel switches 7, when the electric slider drives the mixing head 6 to start moving forward and moves to the position of the front travel switch 7, the mixing head 6 contacts the front travel switch 7. At this time, the contact action of the front travel switch 7 is The normally closed contact is disconnected, cutting off the front motion control circuit, causing the electric slider to stop moving forward. At the same time, the normally open contact is closed, connecting the reverse motion control circuit, causing the electric slider to start driving the mixing head 6 to move backward. On the contrary, when the mixing head 6 starts to move backward until it contacts the travel switch 7 on the rear side, the electric slider drives the mixing head 6 to start moving forward, so that the electric slider drives the mixing head 6 to move back and forth on the displacement track 5 and between the two travel switches 7 (the circuit connection between the travel switch 7 and the electric slider is a prior art) and cooperates with the winding device to drive the PET substrate to move right, so that the foaming material extruded by the mixing head 6 is extruded in a Z-shaped trajectory on the PET substrate.

[0056] like Figure 6 , Figure 8 and Fig. 9 As shown, the clamping member 33 includes a mounting plate 333, and the mounting plate 333 is fixedly connected to the horizontal sections of three inverted L-shaped linkage rods 31 distributed on the left and right. Two toothed synchronous wheels 337 distributed on the left and right are rotatably connected to the opposite surfaces of the two mounting plates 333. A toothed belt 331 is rotatably connected to the two toothed synchronous wheels 337 distributed on the left and right. A clamping groove is provided on the inner ring surface of the toothed belt 331. Two left-right symmetrical inverted L-shaped fixing plates 332 are fixedly connected to the upper surface of the mounting plate 333, and an elastic telescopic connecting column 334 is fixedly connected to the lower surface of the horizontal section of the inverted L-shaped fixing plate 332.

[0057] like Figure 6 , Figure 8 and Fig. 9 As shown, a clamping plate 335 for clamping the lower side of the toothed belt 331 is provided on one side of the mounting plate 333 close to the toothed belt 331 for sliding up and down. Two left-right symmetrical connecting ear plates are provided on the side of the clamping plate 335 close to the center of the support plate 2. The two connecting ear plates distributed on the left and right correspond to the two elastically telescopic connecting columns 334 distributed on the left and right. The connecting ear plates penetrate the mounting plate 333 and are fixedly connected to the bottom ends of the corresponding elastically telescopic connecting columns 334. A plurality of auxiliary rollers 336 evenly distributed along the left and right directions are rotatably connected to one side of the clamping plate 335 close to the center of the support plate 2. The auxiliary rollers 336 are in rolling contact with the clamping grooves on the inner annular surface of the toothed belt 331. The auxiliary rollers 336 change the sliding friction between the clamping plate 335 and the inner side of the toothed belt 331 into rolling friction.

[0058] like Figure 6 , Figure 7 , Fig.10 and Fig.11As shown, the first adjusting member 32 includes a plurality of evenly distributed elastic telescopic support platforms 323 fixedly connected to the upper surface of the base 1, the tops of the plurality of elastic telescopic support platforms 323 are commonly fixedly connected with a fixed connecting plate 324, a bidirectional electric telescopic rod 321 is fixedly connected at the middle position of the lower surface of the fixed connecting plate 324, and a telescopic connecting rod 322 is fixedly connected to the lower surface of the fixed connecting plate 324 and located on the left and right sides of the bidirectional electric telescopic rod 321, the vertical sections of the two inverted L-shaped linkage rods 31 distributed front and back in the middle are respectively fixedly connected to the front and rear ends of the bidirectional electric telescopic rod 321, and the vertical sections of the two inverted L-shaped linkage rods 31 distributed front and back on the left and right sides are respectively connected to the two telescopic connecting rods The front and rear ends of 322 are fixedly connected, and a connecting groove is provided on the lower surface of the support plate 2, and an extrusion plate 326 is slidably connected inside the connecting groove along the left and right directions. A slope inclined along the left and right directions is provided at the middle position of the upper surface of the fixed connection plate 324, and the height gradually increases from left to right. The lower surface of the extrusion plate 326 is also provided with a slope inclined along the left and right directions, and the height gradually decreases from left to right. The slope on the fixed connection plate 324 and the slope on the extrusion plate 326 are inclined in opposite directions and slide in cooperation. Two front-to-back symmetrical electric push rods 325 are fixedly connected to the lower surface of the support plate 2 and located on the left side of the extrusion plate 326, and the telescopic end of the electric push rod 325 is fixedly connected to the extrusion plate 326.

[0059] like Figure 3 , Figure 4 and Figure 5 As shown, the two vertical sections of the door-shaped mounting frame 44 are provided with mounting grooves in the up-and-down directions, and the mounting slide blocks 8 are slidably connected inside the mounting grooves along the up-and-down directions. The horizontal section of the inverted L-shaped linkage rod 31 located in the middle penetrates the mounting slide block 8 along the front-to-back direction and is slidably connected to the mounting slide block 8. The telescopic end of the bidirectional electric telescopic rod 321 located in the middle also penetrates and is slidably connected to the corresponding mounting slide block 8 front-to-back. By setting the mounting slide block 8, it can be ensured that the bidirectional electric telescopic rod 321 maintains vertical movement when moving up and down, and at the same time does not affect the front-to-back movement of the bidirectional electric telescopic rod 321 and the inverted L-shaped linkage rod 31.

[0060] When in use, when the distance between the two clamping members 33 is adjusted by the first adjusting member 32, the bidirectional electric telescopic rod 321 contracts in both directions and drives the two mounting plates 333 to move toward each other through the inverted L-shaped linkage rod 31 thereon. With the arrangement of the left and right telescopic connecting rods 322, the bidirectional electric telescopic rod 321 can support the left and right ends of the mounting plate 333 through the two telescopic connecting rods 322 when adjusting the relative distance between the two clamping members 33, so that the two mounting plates 333 can move more smoothly, so that the opposite surfaces of the toothed belts 331 on the two mounting plates 333 are respectively attached between the connecting roller 414, the calendering roller 42 and the extension roller 43 to form a synchronous belt. After the distance adjustment of the mounting plate 333 is completed on the front and rear end surfaces of the shaft splicing roller, the electric push rod 325 is extended to push the extrusion plate 326 to slide to the right inside the connecting groove on the support plate 2. At this time, the slope on the extrusion plate 326 fits the slope on the fixed connecting plate 324 and slides to the right, while generating a downward thrust on the fixed connecting plate 324. The fixed connecting plate 324 moves downward and compresses the elastic telescopic support platform 323. The fixed connecting plate 324 drives the mounting plate 333 to move downward through the bidirectional electric telescopic rod 321 and the telescopic connecting rod 322, and the toothed belt 331 moves downward synchronously, and the two toothed belts 331 are used to press the front and rear sides of the two layers of PET substrate below the calendering roller 42.

[0061] When the mounting plate 333 moves downward, the mounting plate 333 drives the elastic telescopic connecting column 334 to move downward through the inverted L-shaped fixing plate 332. When the lower side of the toothed belt 331 is in contact with the PET substrate, the elastic telescopic connecting column 334 generates downward pressure on the lower side of the toothed belt 331 through the auxiliary roller 336 on the clamping plate 335, so that the lower side of the toothed belt 331 can be close to the PET substrate. With the elastic force of the elastic telescopic connecting column 334 itself and the auxiliary roller 336, the sliding friction between the clamping plate 335 and the toothed belt 331 is changed into rolling friction, so that the lower side of the toothed belt 331 can be pressed against the PET substrate while being able to rotate on the toothed synchronous wheel 337, so as to ensure that the two layers of PET material can move smoothly to the right.

[0062] When the coaxial splicing roller composed of the connecting roller 414, the calendering roller 42 and the extension roller 43 driven externally starts to calender the foam material, the two toothed belts 331 are used to press the front and rear sides of the two layers of PET material, so that after the foam is subjected to pressure, the excess foam material can extend to the front and rear sides as little as possible, thereby reducing the generation of waste materials on the edges of the front and rear sides and saving foam material. The calendered foam material continues to move to the right and is shaped to obtain high-density microporous polyurethane foam. The front and rear sides of the shaped high-density microporous polyurethane foam are cut neatly by a cutting device and then rolled up by a winding device.

[0063] Working principle: In specific use, first adjust the distance between the calender roller 42 and the upper surface of the support plate 2 according to the thickness of the produced foam, then adjust the width between the two pressing members 33 through the first adjusting member 32 according to the width of the produced foam, and then pass the upper and lower layers of PET substrate between the calender roller 42 and the support plate 2, and align the front and rear sides of the PET substrate with the two pressing members 33, and then wind the left ends of the two layers of PET substrate on the winding device, and drive the PET substrate to move from left to right on the support plate 2 through the winding device. At this time, the mixing head 6 slides on the displacement track 5, and cooperates with the design of two front and rear symmetrical travel switches 7. When the mixing head 6 moves to contact the travel switch 7, the travel switch 7 adjusts the mixing head 6 to move in the opposite direction, so that the mixing head 6 reciprocates in the front-back direction on the displacement track 5, and cooperates with the winding device to drive the PET substrate to move, so that the mixing head 6 performs Z-shaped track feeding between the two layers of PET substrate, and then the calendering roller 42 cooperates with the two pressing members 33 to calender the foaming material between the two layers during the foaming process, and high-density microporous polyurethane foam is obtained by calendering and shaping the foaming material, and then the high-density microporous polyurethane foam is neatly trimmed at the edges and rolled together for storage.

[0064] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships are based on the orientations 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 device or element 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.

[0065] In addition, the terms "first", "second", "number one", "number two" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second", "number one", "number two" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0066] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0067] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for preparing high-density microporous polyurethane foam, characterized in that: The following steps are involved: S1. Raw material preparation: prepare polyol, isocyanate, catalyst, foaming agent and surfactant as needed; S2, premixing: adding polyol, catalyst, foaming agent, and surfactant into a stirring device in proportion, and fully mixing the various raw materials together to obtain a mixed raw material; S3, raw material loading: add the mixed raw material obtained in step S2 into the raw material storage tank A, and add the isocyanate prepared in step S1 into the raw material tank B; S4, mixing and foaming: the raw materials in tank A and tank B are preheated in proportion and then transported to the foaming equipment, and the raw materials in tank A and tank B are quickly mixed together by the foaming equipment to form a foaming material; S5, calendaring and shaping: After the mixing head (6) mixes the raw materials together, the foaming material is immediately transported to the PET substrate of the calendaring device, and the foaming material begins to foam. At the same time, the foaming material is calendared and shaped by the calendaring device, and then a high-density microporous polyurethane foam is obtained; S6, trimming and rolling: trimming the edge of the high-density microporous polyurethane foam obtained in step S5 neatly by a cutting device, and then rolling the high-density microporous polyurethane foam by a rolling device; The calendering device involved in the above step S5 comprises a base (1) and a support plate (2) fixedly connected to the upper surface of the base (1), wherein the support plate (2) and the base (1) are jointly provided with a clamping mechanism (3) for limiting the extension width of the foam; A calendering mechanism (4) for calendering foam, the calendering mechanism (4) being arranged on a base (1), a displacement track (5) being fixedly connected to the base (1) and located on the left side of the calendering mechanism (4), and a mixing head (6) being slidably connected to the displacement track (5) in a front-rear direction; The clamping mechanism (3) comprises a first adjusting member (32) disposed on the base (1) and the support plate (2), the first adjusting member (32) being provided with two groups of front-to-back symmetrical inverted L-shaped linkage rods (31), and clamping members (33) for clamping the edge of the PET substrate being disposed on opposite surfaces of the two groups of inverted L-shaped linkage rods (31); The clamping member (33) comprises a mounting plate (333) fixedly connected to the horizontal sections of three inverted L-shaped linkage rods (31) distributed on the left and right, two toothed synchronous wheels (337) distributed on the left and right are rotatably connected to the opposite surfaces of the two mounting plates (333), a toothed belt (331) is rotatably connected to the two toothed synchronous wheels (337) distributed on the left and right, two inverted L-shaped fixed plates (332) symmetrical on the left and right are fixedly connected to the upper surface of the mounting plate (333), and a clamping plate (335) for clamping the lower side of the toothed belt (331) is slidably arranged on one side of the mounting plate (333) close to the center of the support plate (2); The foam extension width is limited by two pressing members (33), and the calendering mechanism (4) is used to push excess material to the right, while the calendering width of the calendering mechanism (4) is adjusted by the first adjusting member (32).

2. The method for preparing a high-density microporous polyurethane foam according to claim 1, characterized in that: Two left-right symmetrical connecting ear plates are arranged on one side of the clamping plate (335) close to the center of the supporting plate (2), and the two connecting ear plates distributed on the left and right correspond to the two elastic telescopic connecting columns (334) distributed on the left and right. The connecting ear plates penetrate the mounting plate (333) and are fixedly connected to the bottom ends of the corresponding elastic telescopic connecting columns (334).

3. The method for preparing a high-density microporous polyurethane foam according to claim 1, characterized in that: A snap-in groove is provided on the inner annular surface of the toothed belt (331); a surface of the clamping plate (335) close to the center of the support plate (2) is rotatably connected to a plurality of auxiliary rollers (336) evenly distributed in the left-right direction; the auxiliary rollers (336) change the sliding friction between the clamping plate (335) and the inner side of the toothed belt (331) into rolling friction.

4. The method for preparing a high-density microporous polyurethane foam according to claim 1, characterized in that: The first adjusting member (32) comprises a plurality of evenly distributed elastic telescopic support platforms (323) fixedly connected to the upper surface of the base (1); the top ends of the plurality of elastic telescopic support platforms (323) are commonly fixedly connected to a fixed connecting plate (324); a bidirectional electric telescopic rod (321) is fixedly connected to the middle position of the lower surface of the fixed connecting plate (324); and telescopic connecting rods (322) are fixedly connected to the lower surface of the fixed connecting plate (324) and located on the left and right sides of the bidirectional electric telescopic rod (321).

5. The method for preparing a high-density microporous polyurethane foam according to claim 4, characterized in that: A slope surface inclined in the left-right direction is provided at the middle position of the upper surface of the fixed connection plate (324), a connecting groove is provided on the lower surface of the support plate (2), an extrusion plate (326) is provided inside the connecting groove for sliding in the left-right direction, and a slope surface inclined in the left-right direction is also provided on the lower surface of the extrusion plate (326), the slope surface on the fixed connection plate (324) and the slope surface on the extrusion plate (326) are inclined in opposite directions and are slidably matched.

6. The method for preparing a high-density microporous polyurethane foam according to claim 4, characterized in that: The vertical sections of the two middle inverted L-shaped linkage rods (31) distributed front and back are respectively fixedly connected to the front and back ends of the bidirectional electric telescopic rod (321), and the vertical sections of the two inverted L-shaped linkage rods (31) distributed front and back on the left and right sides are respectively fixedly connected to the front and back ends of the two telescopic connecting rods (322).

7. The method for preparing a high-density microporous polyurethane foam according to claim 1, characterized in that: The calendering mechanism (4) comprises a gate-shaped mounting frame (44) fixedly connected to the base (1), and two vertical sections of the gate-shaped mounting frame (44) are provided with mounting slide grooves in the up-down direction, and the mounting slide grooves are slidably connected with mounting sliders (8) inside along the up-down direction, and a calendering roller (42) is rotatably arranged on the inner side of the gate-shaped mounting frame (44), and the front and rear ends of the calendering roller (42) are clamped with extension rollers (43), and a connecting piece (41) for pressing the extension roller (43) and the calendering roller (42) is arranged on the horizontal section of the gate-shaped mounting frame (44), and a second adjusting piece (45) for adjusting the height of the calendering roller (42) and the extension roller (43) is arranged in the middle position of the horizontal section of the gate-shaped mounting frame (44).

8. The method for preparing a high-density microporous polyurethane foam according to claim 7, characterized in that: The connecting member (41) comprises two front-to-back symmetrical sliding sleeves (412) slidably connected to the horizontal section of the door-shaped mounting frame (44) along the front-to-back direction; the upper surface of the sliding sleeve (412) slides along the up-down direction and is penetrated by two left-to-right symmetrical limiting sliding rods (413); the bottom ends of the two left-to-right distributed limiting sliding rods (413) are fixedly connected to a connecting plate (411); and connecting rollers (414) are rotatably connected to the opposite surfaces of the two connecting plates (411).

9. The method for preparing a high-density microporous polyurethane foam according to claim 7, characterized in that: The second adjustment member (45) comprises two front-to-rear symmetrical synchronous sliding rods (453) that slide up and down and penetrate and are connected to the horizontal section of the gate-shaped mounting frame (44); the bottom ends of the two synchronous sliding rods (453) are fixedly connected to a bidirectional hydraulic telescopic cylinder (451); the upper surface of the horizontal section of the gate-shaped mounting frame (44) is fixedly connected to a unidirectional electric telescopic rod (452) via a mounting sleeve; the telescopic end of the unidirectional electric telescopic rod (452) penetrates the horizontal section of the gate-shaped mounting frame (44) and is fixedly connected to the upper surface of the bidirectional hydraulic telescopic cylinder (451).

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