Preparation process of PVC (polyvinyl chloride) permeable blister engineering van artificial leather

Abstract

The invention provides a PVC (polyvinyl chloride) permeable blister engineering vehicle artificial leather preparation process, belongs to the technical field of artificial leather, and solves the technical problem that the existing artificial leather preparation process cannot realize stable permeation blister. The method comprises the following steps that unwinding and feeding are conducted; coating for the first time; coating for the second time; coating for the third time; coating for the fourth time; plasticizing and drying; and rolling and collecting materials. According to the invention, the surface of the centrifugal paper is coated for four times, and a layer of elastic net-shaped cloth base is attached to the surface, so that the existing cloth base attaching process is changed, the blister process of a downstream processing factory is stable, the performance requirement of a downstream user on leather is met, and under the action of the aggregate coating device, the plastic uptake process is stable. The four-time coating can be stably processed through a single device, and compared with existing four coating devices, the production space is greatly saved, and stable preparation of the PVC permeation blister artificial leather is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of artificial leather, and relates to a process for preparing artificial leather, in particular to a process for preparing artificial leather for engineering vehicles by PVC infiltration and blistering. Background Art

[0002] Artificial leather is a plastic product that looks and feels like leather and can be used instead of leather. my country's artificial leather and synthetic leather industry is a new industry after the founding of the People's Republic of China. It started to develop in the late 1950s and is one of the earlier developed industries in the plastics industry. After decades of construction, the artificial leather and synthetic leather industry has a considerable economic scale. With the development of high technology at home and abroad and the application of advanced process equipment, industry management, technical level, and product grade have made a fundamental qualitative leap. Artificial leather and synthetic leather have developed into one of the important industries in the daily consumer products industry, and have entered the ranks of world powers at the same time as the entire processing industry. It is a major producer, consumer, and import and export trading country in the world.

[0003] PVC artificial leather is made by coating fabric with PVC resin, plasticizer, stabilizer and other additives to make a paste or laminating it with a layer of PVC film, and then processing it through a certain process. Traditional PVC artificial leather uses petroleum-based raw materials to crack ethylene, which is polymerized to obtain polyvinyl chloride, which is then mixed with plasticizers and plasticized to obtain PVC leather. The PVC artificial leather material for engineering vehicle seats is an important visual part of engineering vehicles. In order to meet the processing needs of engineering vehicle seats, manufacturers need to stably connect artificial leather with the vacuum forming process.

[0004] After searching, it is found that Chinese patent documents disclose a PVC artificial leather, a preparation method and its use [Application number: CN202111667335.5; Publication number: CN114368202A]. This PVC artificial leather, preparation method and its use relate to the technical field of artificial leather preparation. The document discloses that by adding a PVC resin with an average degree of polymerization of 2000 to 3000 and a PVC resin with an average degree of polymerization of 1000 to 1500 to the PVC surface layer and the first PVC foaming layer, the elasticity of the PVC artificial leather can be improved, so that it has good resilience, which is conducive to the rapid recovery of fabric wrinkles.

[0005] Although the PVC artificial leather disclosed in the patent can improve the elasticity of the PVC artificial leather, making it have good resilience and facilitating the rapid recovery of fabric wrinkles, when the PVC artificial leather is used in engineering vehicles, due to the elasticity of the PVC artificial leather, when using the seat, the clothes are prone to friction with the external artificial leather, which can easily cause abnormal noises, and the traditional cloth base is unstable in the subsequent blister process, which is not convenient for subsequent leather processing. Summary of the invention

[0006] The purpose of the present invention is to solve the above problems in the prior art and propose a process for preparing PVC infiltration blister artificial leather for engineering vehicles. The technical problem to be solved by the invention is: how to achieve the processing stability of PVC infiltration blister artificial leather.

[0007] The purpose of the present invention can be achieved by the following technical solutions: A process for preparing artificial leather for engineering vehicles by PVC infiltration blistering comprises the following steps: S1. Unwinding and loading: placing the centrifugal paper on the bracket of the unwinding equipment; S2, one-time coating: the centrifugal paper enters the first coating device, the first coating device evenly coats the PU polyurethane mixture on the centrifugal paper, and controls the thickness of the PU layer through the thickness adjustment component. After uniform coating, it enters the first drying box to remove the solvent methyl ester and DMF in the PU polyurethane mixture, and then the centrifugal paper coated with PU polyurethane is cooled and shaped by the cooling roller device; S3, secondary coating: after the first coating and cooling, the paper enters the second coating equipment, and the second coating equipment evenly coats the PVC + pigment mixture on the PU polyurethane layer of the centrifugal paper, enters the second oven for high-temperature plasticization and shaping, and then passes through the cooling roller equipment, and the dried centrifugal paper contacts the cooling roller for cooling and shaping; S4, three-time coating: after the second coating is finalized, the paper enters the third coating device, the PVC foaming layer is evenly coated on the PVC layer, and enters the third oven for plasticization and foaming, and then passes through the cooling roller device, the dried centrifugal paper is contacted with the cooling roller for cooling and finalization; S5, four coatings: after the three coatings are finalized, the product enters the fourth coating device, and the adhesive PU or PVC coating is evenly coated on the dried foaming layer. Then, the product enters the fourth oven for pre-baking to a semi-dry state, and then a layer of elastic mesh cloth base is attached, and the product is cooled and finalized by the cooling roller device; S6, plasticizing and drying: entering the fifth oven, continuing heating and plasticizing, so that the cloth base and the PVC foam layer are more firmly bonded, and then cooling down to room temperature, and using roller cooling for cooling and shaping; S7, Rolling and gathering: Entering the winding equipment, the centrifugal paper and leather are separated by the peeling roller.

[0008] In step S2, the first oven is heated in a stepwise manner and the temperature is controlled at 110°C-130°C.

[0009] The first oven in step S2 is connected to an induced draft fan, an exhaust fan and a heater, and the top of the first oven is respectively connected to a plurality of recovery towers through a plurality of connecting pipes; The recovery towers include a DMF high-efficiency recovery tower, a plasticizer recovery tower and a DMF recovery tank.

[0010] The temperature of the second oven in step S3 is 170°C-190°C; The temperature of the third oven in step S4 is 185°C-190°C.

[0011] The coating equipment in steps S2, S3, S4 and S5 is an aggregate coating device; The aggregate coating device comprises a drying box installed on one side of the frame, a coating roller rotatably installed inside the frame, a first side plate connected to the top of the frame, and a top plate fixedly installed on the top of the first side plate, four barrels are fixedly connected inside the top plate, and the four barrels are symmetrically arranged in pairs, and a mixing drive assembly is connected inside each barrel; The bottoms of the four barrels are all provided with bottom holes, which are provided at different positions, and a switching component is connected above each bottom hole; The bottom end of each bottom hole is fixedly connected to a material trough, and a through hole is opened on the surface of each material trough relative to the corresponding bottom hole. The four material troughs are arranged in parallel above the coating roller, and the bottom of each material trough is connected to a thickness adjustment component; The mixing drive assembly includes a top frame, and the top frame is fixedly installed on the surface of the top plate, the surface of the top frame is rotatably connected to a rotating rod, and the rotating rod is transmission-connected to a synchronous material transfer unit, the top end of the rotating rod is fixedly connected to the output end of a driving motor, and the driving motor is fixedly installed on the surface of the top frame, the outer wall of the rotating rod is fixedly connected to a main gear plate, and the outer wall of the main gear plate is annularly equidistantly meshed with four slave gear plates; A vertical rod is fixedly installed at the bottom end of each gear plate, and the vertical rod is rotatably connected to the bottom of the top frame, and the four vertical rods are respectively located inside the four barrels, and the outer wall of the vertical rod is fixedly connected to a plurality of mixing rods; The switching assembly includes four rotating plates, each of which is rotatably mounted on the inner bottom wall of each barrel, and two first mounting rods are fixedly mounted on the top of the rotating plate, and the top of the first mounting rod is fixedly connected to a gear ring, and the gear ring is located on the surface of the barrel; The rotating plate is provided with openings corresponding to the bottom hole, and the openings of the four rotating plates are arranged at the same position.

[0012] In the present invention, PU polyurethane mixed liquid, PVC pigment mixed liquid, PVC foaming and adhesive PU or PVC coating are added into four barrels respectively, and the driving motor is started, so that the rotating rod drives the main gear plate to rotate, and under the action of the four slave gear plates meshing synchronously with the outer wall of the main gear plate, the four slave gear plates drive the vertical rods to rotate synchronously, and each vertical rod drives the mixing rod to mix the materials inside the barrel. In order to realize single discharge in different processes, bottom holes are opened at the bottom of the barrel, and the bottom of each bottom hole is fixedly connected to the corresponding material trough. When the discharge trough is switched, the electric motor drives the gear column When the gear column drives the rack to extend and retract, and under the fixed action of the rack and the first toothed plate, the first toothed plate synchronously drives the four gear rings to rotate, and the first mounting rod and the rotating plate are fixedly connected at the bottom of the gear ring, so that the rotating plate is rotated on the surface of the bottom hole, and the first toothed plate can realize the switching of the rotating plate on the surface of the bottom hole through telescopic movement, and the four bottom holes can realize the switching of materials through the synchronous rotation of the four rotating plates, and the corresponding scraper is moved downward when the material is discharged through the corresponding material trough. Specifically, a driving rod is rotatably connected to the outside of the material trough, and the second toothed plate is fixedly connected to the end of the driving rod. Under the meshing action of the two side plates, the second tooth plate can be driven by rotation to lift the second side plate, so that the adjusting frame moves downward to open the material trough, and the adjusting frame can also drive the scraper at the bottom to adjust the height at the bottom of the material trough, so that the scraper can adjust the thickness of the material surface, which is convenient for coating PVC artificial leather of different thicknesses on the surface of the coating roller. At the same time, considering the uniformity of the material inside the barrel entering the material trough, a transmission rod is rotatably connected to the outside of the material trough, and under the action of the transmission unit, the four transmission rods rotate synchronously, and under the action of one of the transmission rods, the transmission rods are connected to the material trough through the transmission rod. The transmission connection between the cross bar and the rotating rod enables the driving motor to synchronously drive the transmission rod to rotate when driving the vertical rod to rotate. By arranging a transfer unit on one side of the transmission rod, the wedge block is fixed by the second side plate, so that when the second side plate moves downward for coating, the wedge block squeezes the sleeve shaft on one side, so that the sleeve shaft is stretched on one side of the transmission rod, and the sleeve shaft is sleeved on one end of the transfer rod, so that the transmission rod and the transfer rod are fixedly connected, so that the transmission rod can drive the transfer rod to rotate synchronously inside the material trough, and the second side plate synchronously drives the corresponding material trough to rotate when moving downward, which is convenient for synchronous mixing of the barrel and the inside of the material trough.

[0013] The synchronous material transfer unit includes a first synchronous wheel, and the first synchronous wheel is fixedly installed on the outer wall of the rotating rod, the outer wall of the first synchronous wheel is meshedly connected with a first synchronous belt, and the inner wall on the other side of the first synchronous belt is meshedly connected with a second synchronous wheel, and the second mounting rod is fixedly installed inside the second synchronous wheel, and the second mounting rod is rotatably connected to the surface of the top frame, and the second mounting rod is parallel to the rotating rod; A first bevel gear is fixedly mounted on the top of the second mounting rod, and a second bevel gear is meshedly connected to the surface of the first bevel gear, a cross bar is fixedly mounted on one side of the second bevel gear, the cross bar is rotatably connected to one side of the top frame, and the cross bar is vertically distributed with the second mounting rod; A third synchronous wheel is fixedly installed on the outer wall of the cross bar, and the third synchronous wheel is located on the outer side of the top frame, the outer wall of the third synchronous wheel is meshedly connected with the second synchronous belt, and the bottom inner wall of the second synchronous belt is meshedly connected with the fourth synchronous wheel, and a transmission rod is fixedly installed inside the fourth synchronous wheel, and the transmission rod is rotatably connected to the outer side of the trough.

[0014] The above structure is adopted, through the setting of the first synchronous wheel and the second synchronous wheel, under the action of the first synchronous belt, the second mounting rod can stably rotate on the surface of the top frame, and by fixing the first bevel gear on the top end of the second mounting rod, through the meshing connection of the first bevel gear and the second bevel gear, the cross bar can rotate synchronously, and under the action of the second synchronous belt, the transmission rod can rotate synchronously. Through such a setting, the rotating rod can synchronously drive the transmission rod to rotate when it rotates, thereby realizing the synchronous material replacement of the transmission rod inside the material trough, with good consistency, and ensuring the mixing effect of the coating material.

[0015] The outer sides of the four material troughs are all rotatably connected with transmission rods, one of which is fixedly connected to the fourth synchronous wheel, and two adjacent transmission rods are driven by a transmission unit; The transmission unit includes a meshing wheel, and the meshing wheel is fixedly mounted on the outer wall of the transmission rod, and the meshing wheel is located outside the material trough, and the outer walls of the two meshing wheels are meshed and connected with a meshing belt; A material transfer unit is movably inserted into one end of the transmission rod, and the material transfer unit is located inside the material trough.

[0016] With the above structure, by arranging transmission rods on the outside of each material trough and connecting the transmission rods in pairs through the transmission unit, the four transmission rods can move synchronously. At the same time, one of the transmission rods is connected to the cross bar through the second synchronous belt, so that the transmission rod and the vertical rod can be stably transmitted, thereby realizing the synchronous rotation of the transmission rod and the mixing rod, and realizing the synchronous mixing of materials in the barrel and the material trough.

[0017] The outer wall of the gear ring is meshed with a first tooth plate, and the first tooth plate is slidably connected to the surface of the top plate, the top of the first tooth plate is fixedly connected to a rack, the top of the rack is meshed with a gear column, a connecting rod is fixedly installed inside the gear column, and vertical plates are rotatably installed at both ends of the connecting rod, the vertical plates are fixedly installed on the surface of the top plate, one end of the connecting rod is fixedly installed with the output end of the electric motor, and the electric motor is fixedly installed on one side of the vertical plate; Two gear rings are meshed and connected on both sides of the first tooth plate, and the two gear rings are distributed in parallel.

[0018] By adopting the above structure, the electric motor can drive the connecting rod to rotate, so that the gear column meshes and rotates on the surface of the rack. Under the meshing action of the rack and the gear column, the rack synchronously drives the first gear plate to slide on the surface of the top plate. By meshing and connecting the four gear rings on both sides of the first gear plate, the four gear rings rotate synchronously. Under the action of the rotating plate connected to the first mounting rod at the bottom of the gear ring, the rotating plate rotates on the surface of the bottom hole, thereby realizing the coating and feeding of different materials through the bottom holes in different positions of the four barrels. The structure is compact and practical.

[0019] The thickness adjustment assembly includes an adjustment frame, and the adjustment frame is sleeved at the bottom of the material trough, a scraper is fixedly installed at the bottom end of the adjustment frame, and second side plates are fixedly installed on both sides of the adjustment frame, and the second side plates are slidably connected to both sides of the material trough; A double-axis motor is fixedly installed on the outer wall of the material trough, and both output ends of the double-axis motor are fixedly connected with driving rods, which are rotatably installed on the outside of the material trough. The outer ends of the driving rods are fixedly installed with second tooth plates, and the second tooth plates are meshingly connected to one side of the second side plate.

[0020] By adopting the above structure, under the action of the thickness adjustment component set at the bottom of each material trough, when the dual-axis motor drives the driving rod to rotate synchronously, the driving rod drives the second tooth plates on both sides to rotate, and the meshing connection between the second tooth plate and the second side plate allows the second tooth plate to drive the second side plate to rise and fall by rotation, so that the adjustment frame drives the scraper at the bottom to adjust the height at the bottom of the material trough, thereby realizing the thickness adjustment of the scraper on the material surface, facilitating the coating processing of PVC artificial leather of different thicknesses, and the adjustment is simple and convenient, with high flexibility.

[0021] The material transfer unit includes a wedge block, and the wedge block is fixedly installed on the inner side of the second side plate, and the bottom end of the wedge block is wedge-shapedly connected to a sleeve shaft, the interior of the sleeve shaft is fixedly connected to a telescopic spring, and the other end of the telescopic spring is embedded in the interior of the transmission rod, and the interior of the sleeve shaft is movably plugged with a material transfer rod, and the material transfer rod is rotatably connected to the interior of the material trough; Both ends of the transfer rod are fixedly connected with a plurality of insertion rods, and the interior of the sleeve shaft is provided with insertion holes corresponding to the insertion rods.

[0022] With the above structure, the wedge block is fixed by the second side plate, so that the second side plate moves downward for coating. The wedge block squeezes the sleeve shaft on one side, so that the sleeve shaft is stretched on one side of the transmission rod. By fixing multiple plug rods on the transfer rod, the sleeve shaft is plugged and fixed at one end of the transfer rod under the action of the corresponding plug holes inside the sleeve shaft, so that the transmission rod and the transfer rod are fixedly connected, and the transmission rod can drive the transfer rod to rotate synchronously. Through such an arrangement, the equipment can drive the corresponding materials inside the material trough to be mixed synchronously during coating.

[0023] Compared with the prior art, the PVC infiltration blister preparation process for engineering vehicle artificial leather of the present invention has the following advantages: 1. In the present invention, by coating the surface of the centrifugal paper four times and laminating a layer of elastic mesh cloth base on the surface, the existing cloth base laminating process is changed, so that the blister process of the downstream processing plant is stable, and the performance requirements of the downstream users for the leather are met. Moreover, under the action of the aggregate coating device, the four coatings can be stably processed by a single device. Compared with the existing four coating devices, the production space is greatly saved, and the stable preparation of PVC infiltration blister artificial leather is realized. Moreover, by connecting the induced draft fan, the exhaust fan and the heater at the top of the oven, the volatile DMF and the plasticizer are respectively recovered, the environmental protection effect is good, the production cost is reduced, and the practicability is strong.

[0024] 2. In the present invention, by arranging four barrels inside the aggregate coating device and arranging the four barrels in parallel in pairs, the materials for four coatings can be added synchronously, and by arranging a material trough corresponding to the bottom of the barrel, a switching assembly is arranged inside the barrel, so that the first tooth plate can synchronously drive the four gear rings to rotate, thereby making the rotating plates inside the four barrels rotate synchronously, and the four rotating plates are opened at the same position and the bottom holes are opened at different positions, so that the barrel can be discharged individually through the material trough, ensuring the discharge accuracy of each coating process, and the driving is simple and convenient, and the transmission effect is good.

[0025] 3. In the present invention, by setting the mixing drive component, the rotating rod can synchronously drive the main gear plate to rotate when it rotates, and by meshing and connecting the slave gear plate on the outer wall of the main gear plate, the four slave gear plates can synchronously drive the vertical rod to rotate inside each corresponding barrel, thereby realizing synchronous mixing of the four barrels, and by connecting a synchronous transfer unit to the outer wall of the rotating rod, the rotating rod can be connected to the transmission rod, and by connecting the transfer unit at one end of the transmission rod, the second side plate can synchronously drive the transfer rod inside the corresponding material trough to rotate when it moves downward, so that the transfer rod can perform synchronous mixing inside the material trough, thereby ensuring the uniformity of the discharging of the coating material, and the high synchronization, thereby realizing a stable discharging effect.

[0026] 4. In the present invention, under the action of the thickness adjustment component, the driving rod is driven to rotate by the dual-axis motor, and under the action of the second tooth plate fixedly connected to the end of the driving rod, the second tooth plate is engaged with the second side plate, so that the second tooth plate can drive the second side plate to rise and fall by rotating, and the adjustment frame drives the scraper at the bottom to adjust the height at the bottom of the material trough, thereby realizing the thickness adjustment of the scraper on the material surface, which is convenient for coating processing of PVC artificial leather of different thicknesses. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The present invention is a process flow chart of preparing artificial leather for engineering vehicles by PVC infiltration blistering.

[0028] Figure 2 It is a structural schematic diagram of the aggregate coating device in the present invention.

[0029] Figure 3 It is a schematic diagram of the connection structure between the barrel and the trough in the present invention.

[0030] Figure 4 It is a schematic diagram of the connection structure between the synchronous material transfer unit and the material trough in the present invention.

[0031] Figure 5 It is a schematic diagram of the cross-sectional structure of the mixing drive assembly in the present invention.

[0032] Figure 6 It is a schematic diagram of the cross-sectional connection structure between the synchronous material transfer unit and the transfer rod in the present invention.

[0033] Figure 7 It is a schematic diagram of the explosion structure of the feeding barrel and the material trough in the present invention.

[0034] Figure 8 It is a schematic diagram of the exploded structure of the bottom hole and the rotating plate in the present invention.

[0035] Fig. 9 It is a schematic diagram of the installation structure of four bottom holes and four rotating plates in the present invention.

[0036] Fig.10 It is a schematic diagram of the connection structure between the transfer plate and the gear ring of the present invention.

[0037] Fig.11 It is a schematic diagram of the connection structure between the mixing drive component and the switching component in the present invention.

[0038] Fig.12 The present invention Figure 4 A is an enlarged structural diagram of FIG.

[0039] Fig.13 It is a schematic diagram of the cross-sectional connection structure between the material trough and the transmission rod in the present invention.

[0040] Fig.14 is a schematic diagram of the connection structure between the adjustment frame and the second side plate in the present invention; Fig.15 It is a structural schematic diagram of the material transfer unit of the present invention; Fig.16 The present invention Fig.15 Schematic diagram of the enlarged structure at B.

[0041] Fig.17 It is a performance table of the artificial leather prepared in the present invention.

[0042] In the figure, 1, frame; 2, drying box; 3, coating roller; 4, first side plate; 5, top plate; 6, barrel; 7, top frame; 8, rotating rod; 9, driving motor; 10, main gear plate; 11, slave gear plate; 12, vertical rod; 13, mixing rod; 14, rotating plate; 15, first mounting rod; 16, gear ring; 17, first gear plate; 18, rack; 19, gear column; 20, connecting rod; 21, electric motor; 22, vertical plate; 23, first synchronous wheel; 24, first synchronous belt; 25, second synchronous wheel ; 26. Second mounting rod; 27. First bevel gear; 28. Second bevel gear; 29. ​​Cross bar; 30. Third synchronous wheel; 31. Second synchronous belt; 32. Fourth synchronous wheel; 33. Material trough; 34. Through hole; 35. Bottom hole; 36. Transmission rod; 37. Adjustment frame; 38. Scraper; 39. Second side plate; 40. Second tooth plate; 41. Drive rod; 42. Dual-axis motor; 43. Meshing wheel; 44. Meshing belt; 45. Wedge block; 46. Sleeve shaft; 47. Telescopic spring; 48. Transfer rod. DETAILED DESCRIPTION

[0043] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0044] Example 1 like Figure 1 As shown, a process for preparing artificial leather for engineering vehicles by PVC infiltration blistering of the present invention comprises the following steps: S1. Unwinding and loading: placing the centrifugal paper on the bracket of the unwinding equipment; S2, one-time coating: the centrifugal paper enters the first coating device, the first coating device evenly coats the PU polyurethane mixture on the centrifugal paper, and controls the thickness of the PU layer through the thickness adjustment component. After uniform coating, it enters the first drying box to remove the solvent methyl ester and DMF in the PU polyurethane mixture. The first drying box adopts a step-by-step heating method and controls the temperature at 110°C. Then, the centrifugal paper coated with PU polyurethane is cooled and shaped by the cooling roller device; The first oven is connected to an induced draft fan, an exhaust fan and a heater, and the top of the first oven is respectively connected to a plurality of recovery towers through a plurality of large-diameter connecting pipes, wherein the recovery towers are a DMF high-efficiency recovery tower, a plasticizer recovery tower and a DMF recovery tank. Through such a setting, the large-diameter pipe above the first oven collects volatile gas under negative pressure and enters the DMF high-efficiency recovery tower, and the DMF aqueous solution is collected through a spray cooling operation to achieve efficient recovery of the DMF aqueous solution. At the same time, through the setting of the plasticizer recovery tower, the plasticizer in the PVC mixed solution is volatilized and enters the plasticizer recovery tower for recovery, thereby achieving the recovery of the volatilized DMF and plasticizer respectively. S3, secondary coating: after the first coating and cooling, the paper enters the second coating equipment, and the second coating equipment evenly coats the PVC + pigment mixture on the PU polyurethane layer of the centrifugal paper, and enters the second oven for high-temperature plasticization and shaping. The temperature of the second oven is 170°C, and then passes through the cooling roller equipment, and the dried centrifugal paper contacts the cooling roller for cooling and shaping; S4, three-time coating: after the second coating is finalized, it enters the third coating equipment, and the PVC foaming layer is evenly coated on the PVC layer, and enters the third oven for plasticization and foaming. The temperature of the third oven is 185°C, and then passes through the cooling roller equipment, and the dried centrifugal paper is contacted with the cooling roller for cooling and finalization; S5, four coatings: after the three coatings are finalized, the product enters the fourth coating device, and the adhesive PU or PVC coating is evenly coated on the dried foaming layer. Then, the product enters the fourth oven for pre-baking to a semi-dry state, and then a layer of elastic mesh cloth base is attached, and the product is cooled and finalized by the cooling roller device; S6, plasticizing and drying: entering the fifth oven, continuing heating and plasticizing, so that the cloth base and the PVC foam layer are more firmly bonded, and then cooling down to room temperature, and using roller cooling for cooling and shaping; S7, Rolling and gathering: Entering the winding equipment, the centrifugal paper and leather are separated by the peeling roller.

[0045] The coating equipment in steps S2, S3, S4 and S5 is an aggregate coating device; See also Figure 2-Figure 16The aggregate coating device includes a frame 1, a drying box 2 installed on one side of the frame 1, a coating roller 3 rotatably installed inside the frame 1, a first side plate 4 connected to the top of the frame 1 and a top plate 5 fixedly installed on the top of the first side plate 4, four barrels 6 are fixedly connected inside the top plate 5, the four barrels 6 can add four times of coating materials correspondingly, and the four barrels 6 are symmetrically arranged in pairs, each barrel 6 is connected to a mixing drive assembly inside, the bottom of the four barrels 6 are provided with bottom holes 35, the four bottom holes 35 are opened at different positions, and the top of each bottom hole 35 is connected to a switching assembly, the bottom end of each bottom hole 35 is fixedly connected to a material trough 33, and the surface of each material trough 33 is provided with a through hole 34 about the corresponding bottom hole 35, the four material troughs 33 are arranged in parallel above the coating roller 3, and the bottom of each material trough 33 is connected to a thickness adjustment assembly, specifically, the mixing drive assembly includes a top frame 7, and the top frame 7 is fixedly installed on the surface of the top plate 5 , the surface of the top frame 7 is rotatably connected with a rotating rod 8, and the rotating rod 8 is transmission-connected with a synchronous material transfer unit, the top of the rotating rod 8 is fixedly connected with the output end of a driving motor 9, and the driving motor 9 is fixedly installed on the surface of the top frame 7, the outer wall of the rotating rod 8 is fixedly connected with a main gear plate 10, and the outer wall of the main gear plate 10 is annularly equidistantly meshed with four slave gear plates 11, and the bottom end of each slave gear plate 11 is fixedly installed with a vertical rod 12, and the vertical rod 12 is rotatably connected to the bottom of the top frame 7, and the four vertical rods 12 are respectively located inside the four barrels 6, and the outer wall of the vertical rod 12 is fixedly connected with a plurality of mixing rods 13. Through such an arrangement, the rotating rod 8 can synchronously drive the synchronous rotation of the main gear plate 10 when rotating. Under the meshing action of the main gear plate 10 and the slave gear plate 11, the four slave gear plates 11 synchronously drive the corresponding vertical rods 12 to rotate inside the four barrels 6, thereby realizing efficient mixing of the mixing rods 13 inside the barrel 6, and the structure is compact and the driving cost is low; Furthermore, the synchronous material transfer unit includes a first synchronous wheel 23, and the first synchronous wheel 23 is fixedly mounted on the outer wall of the rotating rod 8, the outer wall of the first synchronous wheel 23 is meshedly connected with the first synchronous belt 24, and the inner wall on the other side of the first synchronous belt 24 is meshedly connected with the second synchronous wheel 25, the interior of the second synchronous wheel 25 is fixedly mounted with a second mounting rod 26, the second mounting rod 26 is rotatably connected to the surface of the top frame 7, and the second mounting rod 26 and the rotating rod 8 are distributed in parallel. At the same time, in order to realize the directional transmission of the second mounting rod 26, a first bevel gear 27 is fixedly mounted on the top end of the second mounting rod 26, and the surface of the first bevel gear 27 is meshedly connected with the second bevel gear 28, a cross bar 29 is fixedly mounted on one side of the second bevel gear 28, the cross bar 29 is rotatably connected to one side of the top frame 7, and the cross bar 29 and the second mounting rod 26 are distributed vertically, a third synchronous wheel 30 is fixedly mounted on the outer wall of the cross bar 29, and the third synchronous wheel 30 is located at the top of the top frame 7. On the outside, the outer wall of the third synchronous wheel 30 is meshedly connected with the second synchronous belt 31, and the bottom inner wall of the second synchronous belt 31 is meshedly connected with the fourth synchronous wheel 32. A transmission rod 36 is fixedly installed inside the fourth synchronous wheel 32, and the transmission rod 36 is rotatably connected to the inside of the material trough 33. Through the arrangement of the first synchronous wheel 23 and the second synchronous wheel 25, under the action of the first synchronous belt 24, the second mounting rod 26 is stably rotated on the surface of the top frame 7, and the first bevel gear 27 is fixedly connected to the top of the second mounting rod 26. Through the meshing connection of the first bevel gear 27 and the second bevel gear 28, the cross bar 29 is synchronously rotated. Under the action of the second synchronous belt 31, the transmission rod 36 is synchronously rotated. Through such an arrangement, the rotating rod 8 can synchronously drive the transmission rod 36 to rotate when rotating, thereby realizing the synchronous material replacement of the transmission rod 36 in the material trough 33, with good consistency, and ensuring the mixing effect of the coating material. In order to realize the switching of different materials between the four barrels 6, a switching assembly is arranged inside each bottom hole 35, wherein the switching assembly includes four rotating plates 14, each rotating plate 14 is rotatably mounted on the inner bottom wall of each barrel 6, the rotating plate 14 is provided with openings corresponding to the bottom hole 35, and the openings of the four rotating plates 14 are arranged at the same position, two first mounting rods 15 are fixedly mounted on the top of the rotating plate 14, and the top of the first mounting rod 15 is fixedly connected to a gear ring 16, and the gear ring 16 is located on the surface of the barrel 6, the outer wall of the gear ring 16 is meshed with a first tooth plate 17, and the first tooth plate 17 is slidably connected to the surface of the top plate 5, the top of the first tooth plate 17 is fixedly connected to a rack 18, the top of the rack 18 is meshed with a gear column 19, a connecting rod 20 is fixedly mounted inside the gear column 19, and vertical plates 22 are rotatably mounted at both ends of the connecting rod 20, the vertical plates 22 are fixedly mounted on the surface of the top plate 5, and one end of the connecting rod 20 The output end of the electric motor 21 is fixedly installed at the end, and the electric motor 21 is fixedly installed on one side of the vertical plate 22. Two gear rings 16 are meshed and connected on both sides of the first toothed plate 17, and the two gear rings 16 are distributed in parallel. When the electric motor 21 is energized, the electric motor 21 can drive the connecting rod 20 to rotate, so that the gear column 19 meshes and rotates on the surface of the rack 18. Under the meshing action of the rack 18 and the gear column 19, the rack 18 synchronously drives the first toothed plate 17 to slide on the surface of the top plate 5. By meshing and connecting the four gear rings 16 on both sides of the first toothed plate 17, the four gear rings 16 rotate synchronously. Under the action of the rotating plate 14 connected to the first mounting rod 15 at the bottom of the gear ring 16, the rotating plate 14 rotates on the surface of the bottom hole 35, thereby realizing the coating and feeding of different materials at the bottom of the four barrels 6 through the bottom holes 35 at different positions. The structure is compact and practical.

[0046] In order to ensure the mixing effect of the material inside the barrel 6 entering the material trough 33, a transmission rod 36 is rotatably connected inside the four material troughs 33, one of the transmission rods 36 is fixedly connected to the fourth synchronous wheel 32, and the two adjacent transmission rods 36 are driven by a transmission unit. Specifically, the transmission unit includes a meshing wheel 43, and the meshing wheel 43 is fixedly mounted on the outer wall of the transmission rod 36, and the meshing wheel 43 is located on the outer side of the material trough 33. The outer walls of the two meshing wheels 43 are meshed and connected with a meshing belt 44. By arranging a transmission rod 36 on the outer side of each material trough 33, , and the transmission rods 36 are connected in pairs through the transmission unit, so that the four transmission rods 36 are synchronously moved. At the same time, when one of the transmission rods 36 is connected to the cross bar 29 through the second synchronous belt 31, the transmission rod 36 and the vertical rod 12 are stably transmitted, so that the transmission rod 36 and the mixing rod 13 are synchronously rotated, ensuring the mixing effect of the materials in the barrel 6 and the trough 33. One end of the transmission rod 36 is movably connected with a transfer unit, and the transfer unit is located inside the trough 33. Specifically, the transfer unit includes There is a wedge block 45, and the wedge block 45 is fixedly installed on the inner side of the second side plate 39, and the bottom end of the wedge block 45 is wedge-shapedly connected to a sleeve shaft 46, and a telescopic spring 47 is fixedly connected to the inside of the sleeve shaft 46, and the other end of the telescopic spring 47 is embedded in the inside of the transmission rod 36, and a transfer rod 48 is movably inserted in the inside of the sleeve shaft 46, and the transfer rod 48 is rotatably connected to the inside of the material trough 33. Through such an arrangement, the wedge block 45 is fixed under the fixing action of the second side plate 39, and when the second side plate 39 moves downward for coating, the wedge block 45 is moved in one direction. The side extrusion sleeve 46 stretches the sleeve 46 on one side of the transmission rod 36. Under the action of a plurality of plug rods fixedly connected at both ends of the transfer rod 48, the sleeve 46 is plugged and fixed at one end of the transfer rod 48 by opening corresponding plug holes inside the sleeve 46 for the plug rods. The transmission rod 36 and the transfer rod 48 are fixedly connected, so that the transmission rod 36 can drive the transfer rod 48 to rotate synchronously inside the material trough 33. Through such an arrangement, the equipment can drive the materials inside the corresponding discharge trough 33 to be mixed synchronously during coating.

[0047] In order to adjust the thickness of the coating material on the surface of the coating roller 3, a thickness adjustment component is provided at the bottom of the material trough 33. Specifically, the thickness adjustment component includes an adjustment frame 37, and the adjustment frame 37 is sleeved on the bottom of the material trough 33. A scraper 38 is fixedly installed at the bottom of the adjustment frame 37, and second side plates 39 are fixedly installed on both sides of the adjustment frame 37. The second side plates 39 are slidably connected to both sides of the material trough 33. A double-axis motor 42 is fixedly installed on the outer wall of the material trough 33, and the output ends of both ends of the double-axis motor 42 are fixedly connected to a driving rod 41. The driving rod 41 is rotatably installed on the outer side of the material trough 33, and the outer ends of the driving rod 41 are fixedly installed with a second tooth plate 40, and the second The tooth plate 40 is meshedly connected to one side of the second side plate 39. Under the action of the thickness adjustment component set at the bottom of each material trough 33, when the dual-axis motor 42 drives the driving rod 41 to rotate synchronously, the driving rod 41 drives the second tooth plates 40 on both sides to rotate. Through the meshing connection between the second tooth plate 40 and the second side plate 39, the second tooth plate 40 can drive the second side plate 39 to rise and fall by rotation, and the adjustment frame 37 drives the scraper 38 at the bottom to adjust the height at the bottom of the material trough 33, thereby realizing the thickness adjustment of the scraper 38 on the material surface, which is convenient for coating PVC artificial leather of different thicknesses, and the adjustment is simple and convenient, with high flexibility.

[0048] Working principle: When in use, PU polyurethane mixed liquid, PVC pigment mixed liquid, PVC foaming and adhesive PU or PVC coating are added to four barrels 6 respectively, and the driving motor 9 is started, so that the rotating rod 8 drives the main gear plate 10 to rotate, and under the action of the four slave gear plates 11 that are synchronously meshed with the outer wall of the main gear plate 10, the four slave gear plates 11 drive the vertical rods 12 to rotate synchronously, and each vertical rod 12 drives the mixing rod 13 to mix the materials inside the barrel 6. In order to realize single discharge in different processes, a bottom hole 35 is opened at the bottom of the barrel 6, and the bottom of each bottom hole 35 is fixedly connected to the corresponding material trough 33. When the discharge trough 33 is switched, the electric motor 21 drives the gear column 19 to rotate, so that the gear The column 19 drives the rack 18 to perform telescopic activities. Under the fixing action of the rack 18 and the first tooth plate 17, the first tooth plate 17 synchronously drives the four gear rings 16 to rotate. By fixing the first mounting rod 15 and the rotating plate 14 at the bottom of the gear ring 16, the rotating plate 14 is rotated on the surface of the bottom hole 35, so that the first tooth plate 17 can realize the switching of the rotating plate 14 on the surface of the bottom hole 35 through telescopic movement, and the four bottom holes 35 can realize the switching of materials through the synchronous rotation of the four rotating plates 14. When the material is discharged through the corresponding material trough 33, the corresponding scraper 38 is moved downward. Specifically, a driving rod 41 is rotatably connected to the outer side of the material trough 33, and a second tooth plate 40 is fixedly connected at the end of the driving rod 41. Under the meshing action of the plate 39, the second tooth plate 40 can drive the second side plate 39 to rise and fall by rotating, so that the adjustment frame 37 moves downward to open the material trough 33, and the adjustment frame 37 can also drive the scraper 38 at the bottom to adjust the height at the bottom of the material trough 33, so that the scraper 38 can adjust the thickness of the material surface, which is convenient for coating the surface of the coating roller 3 with PVC artificial leather of different thicknesses. At the same time, considering the uniformity of the material inside the barrel 6 entering the material trough 33, a transmission rod 36 is rotatably connected to the outside of the material trough 33, and under the action of the transmission unit, the four transmission rods 36 are rotated synchronously, and under the action of one of the transmission rods 36, the transmission connection between the cross bar 29 and the rotating rod 8 is realized. The drive motor 9 can synchronously drive the transmission rod 36 to rotate when driving the vertical rod 12 to rotate. By arranging a transfer unit on one side of the transmission rod 36, the wedge block 45 is fixed by the second side plate 39. When the second side plate 39 moves downward for coating, the wedge block 45 squeezes the sleeve shaft 46 on one side, so that the sleeve shaft 46 is stretched on one side of the transmission rod 36, and the sleeve shaft 46 is sleeved on one end of the transfer rod 48, so that the transmission rod 36 and the transfer rod 48 are fixedly connected, so that the transmission rod 36 can drive the transfer rod 48 to rotate synchronously inside the material trough 33, and the second side plate 39 synchronously drives the corresponding material trough 33 to rotate when moving downward, which is convenient for the synchronous mixing of the barrel 6 and the inside of the material trough 33, and the synchronization effect is good.The driving cost is low, and the preparation process of PVC infiltration blister for engineering vehicle artificial leather is completed.

[0049] Example 2 The difference between this embodiment and embodiment 1 is that in step S2, the first oven is heated in a stepwise manner and the temperature is controlled at 120°C.

[0050] The temperature of the second oven in step S3 is 180°C; The temperature of the third oven in step S4 is 188°C.

[0051] In this embodiment, the coating equipment in steps S2, S3, S4 and S5 is an aggregate coating device.

[0052] Example 3 The difference between this embodiment and embodiment 1 is that in step S2, the first oven is heated in a stepwise manner and the temperature is controlled at 130°C.

[0053] The temperature of the second oven in step S3 is 190°C; The temperature of the third oven in step S4 is 190°C; In this embodiment, the coating equipment in steps S2, S3, S4 and S5 is an aggregate coating device.

[0054] Example 4

[0055] The difference between this embodiment and embodiment 1 is that in step S2, the first oven is heated in a stepwise manner and the temperature is controlled at 130°C.

[0056] The temperature of the second oven in step S3 is 190°C; The temperature of the third oven in step S4 is 190°C; In this embodiment, the coating equipment in steps S2, S3, S4 and S5 is an existing coating equipment, and the oven is an existing oven equipment.

[0057] Experimental example 200 artificial leathers prepared in the above examples 1-4 were taken, and the same artificial leather prepared by the existing artificial leather preparation process was taken. The prepared artificial leathers were tested for performance according to GB / T 8948-2008, GB / T 7568.2-2008, QB / T 4043-2010, QB / T2709-2005 and QC / T 236-1997. The results were as follows: Fig.17 .

[0058] according to Fig.17It can be seen that the tensile strength and elongation at break of the artificial leather prepared by the PVC infiltration blistering process for engineering vehicles of the present invention are superior to those of the artificial leather prepared by the artificial leather process in the prior art.

[0059] In summary, by coating the surface of centrifugal paper four times and laminating a layer of elastic mesh cloth base on the surface, the existing cloth base laminating process is changed, so that the blister process of the downstream processing plant is stable and the performance requirements of the downstream users for leather are met. Moreover, under the action of the aggregate coating device, the four coatings can be stably processed by a single device. Compared with the existing four coating equipment, the production space is greatly saved, and the stable preparation of PVC infiltration blister artificial leather is achieved. Moreover, by connecting the induced draft fan, exhaust fan and heater at the top of the oven, the volatile DMF and plasticizer are recovered separately, which has good environmental protection effect, reduces production costs, has strong practicality, and solves the technical problem that the existing artificial leather preparation process cannot achieve stable infiltration blister.

[0060] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A process for preparing artificial leather for engineering vehicles by PVC infiltration blistering, characterized in that: The following steps are involved: S1. Unwinding and loading: placing the centrifugal paper on the bracket of the unwinding equipment; S2, one-time coating: the centrifugal paper enters the first coating device, the first coating device evenly coats the PU polyurethane mixture on the centrifugal paper, and controls the thickness of the PU layer through the thickness adjustment component. After uniform coating, it enters the first drying box to remove the solvent methyl ester and DMF in the PU polyurethane mixture, and then the centrifugal paper coated with PU polyurethane is cooled and shaped by the cooling roller device; S3, secondary coating: after the first coating and cooling, the paper enters the second coating equipment, and the second coating equipment evenly coats the PVC + pigment mixture on the PU polyurethane layer of the centrifugal paper, enters the second oven for high-temperature plasticization and shaping, and then passes through the cooling roller equipment, and the dried centrifugal paper contacts the cooling roller for cooling and shaping; S4, three-time coating: after the second coating is finalized, the paper enters the third coating device, the PVC foaming layer is evenly coated on the PVC layer, and enters the third oven for plasticization and foaming, and then passes through the cooling roller device, the dried centrifugal paper is contacted with the cooling roller for cooling and finalization; S5, four coatings: after the three coatings are finalized, the product enters the fourth coating device, and the adhesive PU or PVC coating is evenly coated on the dried foaming layer. Then, the product enters the fourth oven for pre-baking to a semi-dry state, and then a layer of elastic mesh cloth base is attached, and the product is cooled and finalized by the cooling roller device; S6, plasticizing and drying: entering the fifth oven, continuing heating and plasticizing, so that the cloth base and the PVC foam layer are more firmly bonded, and then cooling down to room temperature, and using roller cooling for cooling and shaping; S7, winding and gathering: entering the winding equipment, the centrifugal paper and leather are separated from the leather paper under the action of the stripping roller.

2. The process for preparing artificial leather for engineering vehicles by PVC infiltration blistering according to claim 1, characterized in that: In step S2, the first oven is heated in a stepwise manner and the temperature is controlled at 110°C-130°C.

3. The process for preparing artificial leather for engineering vehicles by PVC infiltration blistering according to claim 2, characterized in that: The first oven in step S2 is connected to an induced draft fan, an exhaust fan and a heater, and the top of the first oven is respectively connected to a plurality of recovery towers through a plurality of connecting pipes; The recovery towers include a DMF high-efficiency recovery tower, a plasticizer recovery tower and a DMF recovery tank.

4. The process for preparing artificial leather for engineering vehicles by PVC infiltration blistering according to claim 1, characterized in that: The temperature of the second oven in step S3 is 170°C-190°C; The temperature of the third oven in step S4 is 185°C-190°C.

5. A process for preparing artificial leather for engineering vehicles by PVC infiltration blistering according to any one of claims 1 to 4, characterized in that: The coating equipment in steps S2, S3, S4 and S5 is an aggregate coating device; The aggregate coating device comprises a frame (1), a drying box (2) mounted on one side of the frame (1), a coating roller (3) rotatably mounted inside the frame (1), a first side plate (4) connected to the top of the frame (1), and a top plate (5) fixedly mounted on the top of the first side plate (4), wherein four barrels (6) are fixedly connected inside the top plate (5), and the four barrels (6) are symmetrically arranged in pairs, and each barrel (6) is connected inside with a mixing drive assembly; The bottoms of the four barrels (6) are each provided with a bottom hole (35), the four bottom holes (35) are provided at different positions, and a switching component is connected above each bottom hole (35); The bottom end of each bottom hole (35) is fixedly connected to a material trough (33), and a through hole (34) is provided on the surface of each material trough (33) relative to the corresponding bottom hole (35). The four material troughs (33) are arranged in parallel above the coating roller (3), and the bottom of each material trough (33) is connected to a thickness adjustment component; The mixing drive assembly comprises a top frame (7), and the top frame (7) is fixedly mounted on the surface of the top plate (5); the surface of the top frame (7) is rotatably connected to a rotating rod (8), and the rotating rod (8) is transmission-connected to a synchronous material transfer unit; the top end of the rotating rod (8) is fixedly connected to the output end of a driving motor (9), and the driving motor (9) is fixedly mounted on the surface of the top frame (7); the outer wall of the rotating rod (8) is fixedly connected to a main gear plate (10), and the outer wall of the main gear plate (10) is annularly equidistantly meshed with four slave gear plates (11); A vertical rod (12) is fixedly mounted on the bottom end of each gear plate (11), and the vertical rod (12) is rotatably connected to the bottom of the top frame (7), and the four vertical rods (12) are respectively located inside four barrels (6), and the outer walls of the vertical rods (12) are fixedly connected to a plurality of mixing rods (13); The switching assembly comprises four rotating plates (14), each rotating plate (14) being rotatably mounted on the inner bottom wall of each barrel (6), two first mounting rods (15) being fixedly mounted on the top of the rotating plate (14), and a gear ring (16) being fixedly connected to the top of the first mounting rod (15), and the gear ring (16) being located on the surface of the barrel (6); The rotating plate (14) is provided with an opening corresponding to the bottom hole (35), and the openings of the four rotating plates (14) are arranged at the same position.

6. The process for preparing artificial leather for engineering vehicles by PVC infiltration blistering according to claim 5, characterized in that: The synchronous material transfer unit comprises a first synchronous wheel (23), and the first synchronous wheel (23) is fixedly mounted on the outer wall of the rotating rod (8), the outer wall of the first synchronous wheel (23) is meshedly connected with a first synchronous belt (24), and the inner wall of the other side of the first synchronous belt (24) is meshedly connected with a second synchronous wheel (25), and a second mounting rod (26) is fixedly mounted inside the second synchronous wheel (25), the second mounting rod (26) is rotatably connected to the surface of the top frame (7), and the second mounting rod (26) and the rotating rod (8) are distributed in parallel; A first bevel gear (27) is fixedly mounted on the top of the second mounting rod (26), and a second bevel gear (28) is meshingly connected to the surface of the first bevel gear (27), a cross bar (29) is fixedly mounted on one side of the second bevel gear (28), the cross bar (29) is rotatably connected to one side of the top frame (7), and the cross bar (29) and the second mounting rod (26) are vertically distributed; A third synchronous wheel (30) is fixedly mounted on the outer wall of the cross bar (29), and the third synchronous wheel (30) is located on the outer side of the top frame (7). A second synchronous belt (31) is meshedly connected to the outer wall of the third synchronous wheel (30), and a fourth synchronous wheel (32) is meshedly connected to the inner wall of the bottom of the second synchronous belt (31). A transmission rod (36) is fixedly mounted inside the fourth synchronous wheel (32), and the transmission rod (36) is rotatably connected to the outer side of the trough (33).

7. The process for preparing artificial leather for engineering vehicles by PVC infiltration blistering according to claim 6, characterized in that: The outer sides of the four material troughs (33) are all rotatably connected to transmission rods (36), one of the transmission rods (36) is fixedly connected to the fourth synchronous wheel (32), and two adjacent transmission rods (36) are driven by a transmission unit; The transmission unit comprises a meshing wheel (43), and the meshing wheel (43) is fixedly mounted on the outer wall of the transmission rod (36), and the meshing wheel (43) is located outside the material trough (33), and the outer walls of the two meshing wheels (43) are meshingly connected with a meshing belt (44); A material transfer unit is movably inserted into one end of the transmission rod (36), and the material transfer unit is located inside the material trough (33).

8. The process for preparing artificial leather for engineering vehicles by PVC infiltration blistering according to claim 5, characterized in that: The outer wall of the gear ring (16) is meshed with a first tooth plate (17), and the first tooth plate (17) is slidably connected to the surface of the top plate (5); the top of the first tooth plate (17) is fixedly connected to a rack (18), and the top of the rack (18) is meshedly connected to a gear column (19); a connecting rod (20) is fixedly installed inside the gear column (19), and vertical plates (22) are rotatably installed at both ends of the connecting rod (20), and the vertical plates (22) are fixedly installed on the surface of the top plate (5); one end of the connecting rod (20) is fixedly installed with the output end of an electric motor (21), and the electric motor (21) is fixedly installed on one side of the vertical plate (22); Two gear rings (16) are meshedly connected on both sides of the first toothed plate (17), and the two gear rings (16) are distributed in parallel.

9. The process for preparing artificial leather for engineering vehicles by PVC infiltration blistering according to claim 5, characterized in that: The thickness adjustment assembly comprises an adjustment frame (37), and the adjustment frame (37) is sleeved on the bottom of the material trough (33), a scraper (38) is fixedly mounted on the bottom end of the adjustment frame (37), and second side plates (39) are fixedly mounted on both sides of the adjustment frame (37), and the second side plates (39) are slidably connected to both sides of the material trough (33); A double-axis motor (42) is fixedly mounted on the outer wall of the material trough (33), and both output ends of the double-axis motor (42) are fixedly connected to a driving rod (41), the driving rod (41) is rotatably mounted on the outer side of the material trough (33), and a second tooth plate (40) is fixedly mounted on the outer end of the driving rod (41), and the second tooth plate (40) is meshingly connected to one side of the second side plate (39).

10. The process for preparing artificial leather for engineering vehicles by PVC infiltration blistering according to claim 7, characterized in that: The material transfer unit comprises a wedge block (45), and the wedge block (45) is fixedly mounted on the inner side of the second side plate (39), and the bottom end of the wedge block (45) is wedge-shapedly connected to a sleeve shaft (46), the interior of the sleeve shaft (46) is fixedly connected to a telescopic spring (47), and the other end of the telescopic spring (47) is embedded in the interior of the transmission rod (36), and the interior of the sleeve shaft (46) is movably plugged with a material transfer rod (48), and the material transfer rod (48) is rotatably connected to the interior of the material trough (33); Both ends of the transfer rod (48) are fixedly connected to a plurality of insertion rods, and the interior of the sleeve shaft (46) is provided with insertion holes corresponding to the insertion rods.

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