A flexible PP car film stretching and forming equipment

Abstract

The present invention relates to a flexible PP vehicle film stretching and forming equipment applied to the field of film stretching technology. In the process of stretching the vehicle film, marking can be performed twice before preheating and after stretching. When the material is discharged after stretching, the marks of the two markings can be compared with the reference mark. When the three are parallel, it means that the stretching is uniform, and when the three are not parallel, it means that the stretching uniformity is poor. Compared with the prior art, the stretching uniformity detection can be performed while the vehicle film is stretched, so that the uneven stretching can be discovered in time, so that adjustments can be made in time, material loss can be greatly reduced, and the quality of the vehicle film after stretching can be effectively guaranteed. In addition, with the setting of a heat detection unit, the uniformity of heat distribution on the surface of the preheating roller can be monitored to a certain extent, so as to further ensure the uniformity of the vehicle film stretching. When poor uniformity is detected, it is convenient for staff to reduce the scope of equipment abnormality, facilitate adjustments, and reduce the impact on the stretching efficiency of the vehicle film.

Description

Technical Field

[0001] The present invention relates to a flexible PP vehicle film stretching and forming device, in particular to a flexible PP vehicle film stretching and forming device applied in the field of film stretching technology. Background Art

[0002] The film pasted on the surface of car glass is commonly known as car film. Car film is a film product that insulates and protects against ultraviolet rays. The front windshield of a car is the main heat source transmission area for the heating of the air inside the car. After installing a good front windshield film, the driving environment inside the car can be significantly improved, while reducing the energy consumption of the air conditioner, thereby achieving an energy-saving effect.

[0003] The stretching and forming of car films are generally divided into two-way synchronous stretching and longitudinal stretching and transverse stretching separated in the vertical and horizontal directions. For the longitudinal stretching of car films, it is a continuous process. In the existing technology, the uniformity of the car films is generally tested after the stretching is completed and before leaving the factory, and then the defective products are removed. It is impossible to detect the uniformity of the stretching of the car films during stretching. The stretching and testing are separated. When there is a problem with the stretching equipment, it is easy to cause batches of unqualified products, which need to be reworked or scrapped later. It is not only easy to cause waste of materials, but also affect the overall efficiency of the stretching of the car films. Summary of the invention

[0004] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is that the stretching and testing steps are separated, which easily causes waste of materials and affects the overall efficiency of the vehicle film stretching.

[0005] In order to solve the above problems, the present invention provides a flexible PP vehicle film stretching and forming device, comprising a base and a device housing with a control chip and fixedly connected to the upper end of the base, a comparison module located outside the device housing, two marking modules and a timing module located inside the device housing, the marking module, the timing module and the comparison module are all connected to the control chip signal, a discharge port and a feed port are respectively opened at the lower left end and the upper right end of the device housing, the comparison module comprises a reference mark fixedly connected to the base and an image acquisition unit installed at the left end of the device housing, the image acquisition unit comprises a bracket and a high-definition camera installed at the lower end of the bracket, and the high-definition camera is located directly above the reference mark;

[0006] Two horizontally distributed introduction rollers, an upper marking roller located directly below the left introduction roller, two preheating rollers, a fixed stretching roller, a dynamic stretching roller, two annealing rollers, a cooling roller, a re-marking roller located on the left side of the cooling roller, and an export roller are installed in sequence from top to bottom between the front and rear inner walls of the equipment shell through an electric rotating shaft. Two relative horizontal electric slides are installed on the front and rear inner walls of the equipment shell. The electric rotating shaft on the dynamic stretching roller is installed on the electric slide, and the remaining multiple electric rotating shafts are installed on the inner wall of the equipment shell. The two preheating rollers, the fixed stretching roller, the dynamic stretching roller, the two annealing rollers and the cooling roller are alternately distributed left and right, and the re-marking roller is located directly below the upper marking roller. The export roller is located at the discharge port of the equipment shell, and the export roller is lower than the re-marking roller. A film adjustment groove is opened at the outer end of the equipment shell.

[0007] The two marking modules are respectively installed on the upper marking roller and the re-marking roller, the timing module is installed on the inner wall of the equipment shell, and the timing module corresponds to the upper marking roller. The upper marking roller and the re-marking roller are both hollow structures, and the hollow structures are filled with marking liquid. A plurality of marking holes are drilled on the upper marking roller, and the axis extension lines of the marking holes intersect the central axis of the upper marking roller at right angles. The marking module includes a support bar fixedly connected to the inner wall of the upper marking roller, a plurality of marking strips respectively located in the plurality of marking holes, and an electric push rod fixedly connected between the support bar and the marking strip.

[0008] In the above-mentioned flexible PP car film stretching and forming equipment, the stretching uniformity detection can be carried out while the car film is being stretched, so as to timely discover the uneven stretching situation, thereby making timely adjustments, greatly reducing material loss, and effectively ensuring the quality of the car film after stretching.

[0009] As a further improvement of the present application, the reference mark includes a bottom plate fixedly connected to the upper end of the base and a marking line fixedly connected to the upper end of the bottom plate, and the bottom plate is located on the left side of the discharge port.

[0010] As a further improvement of the present application, the length of the bottom plate is greater than the longitudinal span of the discharge port, and the upper surface of the marking line is coated with a bright paint layer.

[0011] As a further improvement of the present application, the marking strip includes a sealing section fixedly connected to the extended end of the electric push rod, a liquid guiding section fixedly connected to the upper end of the sealing section, and a marking section fixedly connected to the upper end of the liquid guiding section. The sealing section is made of elastic rubber material, the marking section is made of water-absorbing material, and both the sealing section and the marking section are interference fit with the marking hole, and the outer surface of the liquid guiding section is in contact with the inner wall of the marking hole.

[0012] As a further improvement of the present application, the liquid guiding section includes an inner conductive strip located on the outside and an outer liquid collecting shell located on the inside of the inner conductive strip, one end of the outer liquid collecting shell is fixedly connected to the sealing section, and the other end of the outer liquid collecting shell is fixedly extended into the marking section, the two ends of the inner conductive strip are respectively fixedly connected to the edges of the marking section and the sealing section, and a plurality of liquid permeable holes are drilled on the outer end of the inner conductive strip on one side close to the sealing section.

[0013] As a further improvement of the present application, the length of the outer polymer liquid shell in the marking section is no more than half the length of the sealing section, and the outer polymer liquid shell is made of a hard water-absorbent material.

[0014] As a further improvement of the present application, the colors of the marking liquid in the upper marking roller and the double marking roller and the colors of the marking lines are different, and the three colors are contrasting colors to each other. The upper marking roller and the double marking roller only rotate when the marking module marks the vehicle film, and the mouths of the marking holes on both do not contact the vehicle film.

[0015] As another improvement of the present application, the preheating roller is a hollow structure, and a plurality of heat detection units distributed in a ring array are fixedly connected inside the preheating roller, and the heat detection units are recessed from both ends to the middle.

[0016] As another improved supplement of the present application, the heat detection unit includes a connecting rod fixedly connected to the inner wall of the preheating roller, two test inclined rods fixedly connected at both ends of the connecting rod and between the inner wall of the preheating roller, a detection ball is placed in the test inclined rod, and a pressure sensor is installed at the end of the test inclined rod away from the connecting rod, the pressure sensor is connected to the control chip signal, and the test inclined rod is also filled with hot melt filler.

[0017] As another improved supplement of the present application, the hot-melt temperature of the hot-melt filler is kept consistent with the preheating temperature when the vehicle film is stretched, and the acute angle formed between the test inclined rod and the horizontal plane is 5-10°C.

[0018] In summary, through the setting of the timing module, the marking module and the comparison module, during the stretching process of the vehicle film, marking can be performed twice, before preheating and after stretching, and the two marking positions are close to each other. When the material is discharged after stretching, the marks of the two markings can be compared with the reference mark. When the three are parallel, it means that the stretching is uniform, and when the three are not parallel, it means that the stretching uniformity is poor. Compared with the existing technology, the stretching uniformity detection of the vehicle film while stretching can be realized, which is convenient for timely detection of the uneven stretching, so that timely adjustment can be made, which greatly reduces material loss and effectively ensures the quality of the vehicle film after stretching; in addition, with the setting of the heat detection unit, the uniformity of the heat distribution on the surface of the preheating roller can be monitored to a certain extent, further ensuring the uniformity of the stretching of the vehicle film, and when poor uniformity is detected, it can also help narrow the scope of the problem, so that the staff can find the problem faster and solve it in time, thereby reducing the impact on the stretching efficiency of the vehicle film. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a front angle stereogram of the first embodiment of the present application;

[0020] Figure 2 This is a back angle stereogram of the first embodiment of the present application;

[0021] Figure 3 A three-dimensional diagram of the interior of the stretching device according to the first embodiment of the present application;

[0022] Figure 4 This is a front view of the first embodiment of the present application;

[0023] Figure 5 This is a schematic diagram of a marking module according to a first embodiment of the present application;

[0024] Figure 6 This is a cross-sectional view of the marking module of the first embodiment of the present application when marking a vehicle film;

[0025] Figure 7 This is a cross-sectional view of the marking module of the first embodiment of the present application when replenishing the marking liquid;

[0026] Figure 8 This is a schematic diagram of the front and side views of the marking module of the first embodiment of the present application;

[0027] Fig. 9 This is a comparison diagram of the stretching module in the first embodiment of the present application under the conditions of uniform stretching and non-uniform stretching;

[0028] Fig.10 A cross-sectional view of a preheating roller according to a second embodiment of the present application;

[0029] Fig.11 This is a partial cross-sectional view of a heat detection unit according to a second embodiment of the present application.

[0030] Description of the numbers in the figure:

[0031] 1 Equipment housing, 101 Film adjustment tank, 3 Brackets, 301 High-definition camera, 41 Bottom plate, 42 Marking line, 51 Upper marking roller, 52 Re-marking roller, 501 Marking hole, 61 Introducing roller, 62 Preheating roller, 631 Fixed stretching roller, 632 Dynamic stretching roller, 64 Annealing roller, 65 Cooling roller, 66 De-exiting roller, 71 Support bar, 72 Electric push rod, 8 Marking bar, 81 Marking section, 82 Liquid guide section, 821 Outer liquid collecting shell, 822 Inner conduction bar, 801 Liquid permeable hole, 83 Sealing section, 9 Heat detection unit, 91 Connecting rod, 92 Test inclined rod, 93 Detection ball, 94 Pressure sensor. DETAILED DESCRIPTION

[0032] Two implementation modes of the present application are described in detail below with reference to the accompanying drawings.

[0033] The first implementation method:

[0034] Figure 1 and Figure 2 A flexible PP car film stretching and forming device is shown, in which area a represents the car film, comprising a base and a device housing 1 with a control chip fixedly connected to the upper end of the base, a comparison module located outside the device housing 1, two marking modules and a timing module located inside the device housing 1, wherein the marking module, the timing module and the comparison module are all connected to the control chip signal, and a discharge port and a feed port are respectively opened at the lower left end and the upper right end of the device housing 1, the comparison module comprises a reference mark fixedly connected to the base and an image acquisition unit installed at the left end of the device housing 1, the image acquisition unit comprises a bracket 3 and a high-definition camera 301 installed at the lower end of the bracket 3, and the high-definition camera 301 is located directly above the reference mark;

[0035] The reference mark includes a bottom plate 41 fixedly connected to the upper end of the base and a marking line 42 fixedly connected to the upper end of the bottom plate 41. The bottom plate 41 is located on the left side of the discharge port. The length of the bottom plate 41 is greater than the longitudinal span of the discharge port. The upper surface of the marking line 42 is coated with a bright paint layer. The color of the marking liquid in the upper marking roller 51 and the double marking roller 52 and the color of the marking line 42 are different, and the three colors are contrasting colors. The upper marking roller 51 and the double marking roller 52 only rotate when the marking module marks the vehicle film, and the mouths of the marking holes 501 on the two do not contact the vehicle film, so that after the high-definition camera 301 simultaneously obtains the image information of the two markings and the marking line 42, the three have different colors and are clearly distinguished, which is convenient for judging the uniformity of the stretching of the vehicle film and effectively ensures the detection of the uniformity of the stretching of the vehicle film.

[0036] like Figure 3, two horizontally distributed introduction rollers 61, an upper marking roller 51 located directly below the left introduction roller 61, two preheating rollers 62, a fixed stretching roller 631, a dynamic stretching roller 632, two annealing rollers 64, a cooling roller 65, a re-marking roller 52 located on the left side of the cooling roller 65, and an export roller 66 are installed in sequence from top to bottom between the front and rear inner walls of the equipment housing 1 through an electric rotating shaft, and two relative horizontal electric slides are installed on the front and rear inner walls of the equipment housing 1, the electric rotating shaft on the dynamic stretching roller 632 is installed on the electric sliding table, and the remaining multiple electric rotating shafts are installed on the inner wall of the equipment housing 1, two preheating rollers 62, fixed stretching rollers 631, a movable stretching roller 632, two annealing rollers 64 and a cooling roller 65 are alternately distributed on the left and right, and the re-marking roller 52 is located directly below the upper marking roller 51, and the lead-out roller 66 is located at the discharge port of the equipment housing 1, and the lead-out roller 66 is lower than the re-marking roller 52, and a film adjustment groove 101 is cut at the outer end of the equipment housing 1; after the end of the film enters from the feed port, it adheres to the outer rings of the two lead-in rollers 61 and the upper marking roller 51 and passes through the two preheating rollers 62, the fixed stretching roller 631, the movable stretching roller 632, the two annealing rollers 64, the cooling roller 65 in turn, and finally passes through the top of the re-marking roller 52, the bottom of the lead-out roller 66 and is discharged from the discharge port, as shown in FIG. Figure 4 The direction of the film adjustment groove 101 is consistent with the direction of the vehicle film in the equipment housing 1. When in use, the vehicle film is first preheated, then stretched, and finally annealed and cooled, and then stretched and discharged.

[0037] like Figure 5 , two marking modules are respectively installed on the upper marking roller 51 and the re-marking roller 52, the timing module is installed on the inner wall of the equipment housing 1, and the timing module corresponds to the upper marking roller 51, the upper marking roller 51 and the re-marking roller 52 are both hollow structures, and the hollow structure is filled with marking liquid, the marking liquid is a liquid dissolved with water-soluble colored pigments, so that the marks formed by subsequent marking are easy to erase and not easy to affect the use of the vehicle film, a plurality of marking holes 501 are drilled on the upper marking roller 51, and the axis extension line of the marking hole 501 is perpendicular to the central axis of the upper marking roller 51. The marking module includes a support bar 71 fixedly connected to the inner wall of the upper marking roller 51, a plurality of marking strips 8 respectively located in the plurality of marking holes 501, and an electric push rod 72 fixedly connected between the support bar 71 and the marking strip 8, as shown Figure 8The marking strip 8 includes a sealing section 83 fixedly connected to the extended end of the electric push rod 72, a liquid guide section 82 fixedly connected to the upper end of the sealing section 83, and a marking section 81 fixedly connected to the upper end of the liquid guide section 82. The sealing section 83 is made of elastic rubber material, and the marking section 81 is made of water-absorbing material. The sealing section 83 and the marking section 81 are both interference fit with the marking hole 501, so that the two can play a certain blocking role on the marking hole 501, so that the marking liquid is not easy to overflow. The outer surface of the liquid guide section 82 contacts the inner wall of the marking hole 501. The liquid guide section 82 includes an inner conductive strip 822 located on the outside to And an outer liquid collecting shell 821 located on the inner side of the inner conductive strip 822, one end of the outer liquid collecting shell 821 is fixedly connected to the sealing section 83, and the other end of the outer liquid collecting shell 821 is fixedly extended into the marking section 81, the two ends of the inner conductive strip 822 are respectively fixedly connected to the edges of the marking section 81 and the sealing section 83, and a plurality of liquid permeable holes 801 are drilled on the outer end of one side of the inner conductive strip 822 close to the sealing section 83, the length of the outer liquid collecting shell 821 located in the marking section 81 is not greater than half the length of the sealing section 83, and the outer liquid collecting shell 821 is made of a hard water-absorbing material, which is convenient for conveying the marking liquid to the marking section 81.

[0038] like Figure 7 During the first marking, the control chip first controls the electric push rod 72 to shorten, so that the lower end of the marking strip 8 enters the upper marking roller 51, and then controls the upper marking roller 51 to rotate toward the side away from the vehicle film, so that the part of the marking strip 8 located inside it is immersed in the marking liquid, and the liquid is gradually transferred to the marking section 81 along the liquid permeable hole 801 and the inner conductive strip 822. When the marking strip 8 rotates to the vehicle film with the upper marking roller 51, as shown in FIG. Figure 6 , the control chip controls the electric push rod 72 to extend, so that the upper end of the marking section 81 extends to the outside of the upper marking roller 51 and contacts the vehicle film, but quickly resets to achieve multiple linearly distributed points on the back of the vehicle film to form the first mark. During the first marking, the timing module starts timing. The moving speed of the vehicle film during stretching is preset before the equipment starts working. According to the speed and the timing duration, the control chip can calculate and monitor the position of the first marking point. When the point is about to reach the re-marking roller 52, the above marking process is repeated again. The multiple marking strips 8 on the re-marking roller 52 are again marked with multiple linearly distributed points on the vehicle film to form the second mark. As the vehicle film is fed out, as shown in FIG. Fig. 9In the figure, b represents the first mark, and c represents the second mark. When reaching the reference mark, the high-definition camera 301 simultaneously obtains the marks of the two markings and the image information of the marking line 42. When the first mark is parallel to the second mark, the two marks are compared with the marking line 42 to see if they are parallel. If they are parallel, it means that the uniformity of stretching of the film is good. Only when the three marks are parallel can it be said that the stretching uniformity is good. In other cases, for example, when the first mark is inconsistent and not linear, it can be directly explained that the stretching uniformity is poor. When the first mark is still linear but in an inclined state, it means that there are still problems with the uniformity of stretching of the film.

[0039] When the three marks are not parallel, the staff needs to inspect and handle them in time, so as to effectively avoid large-scale uneven stretching of the car film, reduce material waste, and reduce the impact on stretching efficiency.

[0040] In summary, through the setting of the timing module, the marking module and the comparison module, during the stretching process of the vehicle film, marking can be performed twice before preheating and after stretching, and the two marking positions are close to each other. When the material is discharged after stretching, the marks of the two markings can be compared with the reference mark. When the three are parallel, it means that the stretching is uniform, and when the three are not parallel, it means that the stretching uniformity is poor. Compared with the existing technology, the stretching uniformity detection of the vehicle film while stretching can be realized, which is convenient for timely detection of uneven stretching, so that timely adjustments can be made, which greatly reduces material loss and effectively ensures the quality of the vehicle film after stretching.

[0041] The second implementation method:

[0042] Based on the first embodiment, this embodiment adds a heat detection unit 9, and the rest of the parts are consistent with the first embodiment.

[0043] Figure 10-11As shown, the preheating roller 62 is a hollow structure, and a plurality of heat detection units 9 distributed in a ring array are fixedly connected inside the preheating roller 62, and the heat detection unit 9 is recessed from both ends to the middle. The heat detection unit 9 includes a connecting rod 91 fixedly connected to the inner wall of the preheating roller 62, and two test inclined rods 92 respectively fixedly connected between the two ends of the connecting rod 91 and the inner wall of the preheating roller 62. A detection ball 93 is placed in the test inclined rod 92, and a pressure sensor 94 is installed at the end of the test inclined rod 92 away from the connecting rod 91. The pressure sensor 94 is connected to the control chip signal. The test inclined rod 92 is also filled with hot melt filler. When the surface temperature of the preheating roller 62 is uniform, the hot melt filler is hot-melted at the preheating temperature and has fluidity. The detection ball 93 can pass through the test inclined rod 92. During the rotation of the preheating roller 62, due to The inclination of the test inclined rod 92 allows the detection ball 93 to move back and forth more smoothly in the test inclined rod 92, and can impact the pressure sensor 94 to generate force data. When the temperature 6 is higher than the preset temperature required for preheating, the fluidity of the hot-melt filler is enhanced, and the resistance encountered by the detection ball 93 when moving is weakened, so that the impact force on the pressure sensor 94 is increased, and the force data will increase. When the local temperature is low, the fluidity of the corresponding hot-melt filler becomes worse, and the data on the pressure sensor 94 becomes smaller accordingly. The uniformity of the data collected by multiple pressure sensors 94 can present the uniformity of the heat distribution on the surface of the preheating roller 62, which is convenient for the staff to make timely adjustments so that the stretching of the vehicle film can be carried out stably, and its stretching uniformity is not easy to be uneven due to the failure to timely detect the uneven heat distribution of the preheating roller 62, thereby effectively ensuring the uniformity of the stretching of the vehicle film.

[0044] The hot-melt temperature of the hot-melt filler is consistent with the preheating temperature when the vehicle film is stretched. The acute angle formed between the test inclined rod 92 and the horizontal plane is 5-10°C. If the angle is too large, the middle of the heat detection unit 9 is too far away from the surface of the preheating roller 62, resulting in the data collected by the pressure sensor 94 being unable to accurately represent the uniformity of heat distribution on the surface of the preheating roller 62, and the monitoring effect is poor. The angle is too small, which is not conducive to the movement of the detection ball 93 in the test inclined rod 92.

[0045] It is worth noting that a heating component is installed in the middle of the preheating roller 62, and the preheating roller 62 is filled with heat transfer oil for preheating the vehicle film. This is the existing technology and will not be described in detail here.

[0046] In conjunction with the setting of the heat detection unit 9, the uniformity of heat distribution on the surface of the preheating roller 62 can be monitored to a certain extent, further ensuring the uniformity of the stretching of the vehicle film, and when poor uniformity is detected, it can also help narrow the scope of the problem, making it easier for staff to find the problem faster, solve it in time, and reduce the impact on the stretching efficiency of the vehicle film.

[0047] In view of current practical needs, the above-mentioned implementation mode adopted in this application is not limited to the scope of protection. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the scope of protection of the present invention.

Claims

1. A flexible PP car film stretching and forming equipment, characterized by: It comprises a base and a device housing (1) having a control chip and fixedly connected to the upper end of the base, a comparison module located outside the device housing (1), two marking modules and a timing module located inside the device housing (1), the marking module, the timing module and the comparison module are all connected to the control chip signal, the device housing (1) is provided with a discharge port and a feed port at the lower left end and the upper right end, respectively, the comparison module comprises a reference mark fixedly connected to the base and an image acquisition unit installed at the left end of the device housing (1), the image acquisition unit comprises a bracket (3) and a high-definition camera (301) installed at the lower end of the bracket (3), the high-definition camera (301) is located directly above the reference mark, the reference mark comprises a bottom plate (41) fixedly connected to the upper end of the base and a marking line (42) fixedly connected to the upper end of the bottom plate (41), the bottom plate (41) is located on the left side of the discharge port; The front and rear inner walls of the device housing (1) are provided with two horizontally distributed introduction rollers (61), an upper marking roller (51) located directly below the left introduction roller (61), two preheating rollers (62), a fixed stretching roller (631), a dynamic stretching roller (632), two annealing rollers (64), a cooling roller (65), a re-marking roller (52) located on the left side of the cooling roller (65), and an outlet roller (66) in sequence from top to bottom via an electric rotating shaft. The front and rear inner walls of the device housing (1) are provided with two opposite horizontal electric slides. The dynamic stretching roller (632 ) is mounted on an electric slide, and the remaining plurality of electric shafts are mounted on the inner wall of the equipment housing (1); the two preheating rollers (62), the fixed stretching roller (631), the dynamic stretching roller (632), the two annealing rollers (64) and the cooling roller (65) are alternately distributed on the left and right, and the re-marking roller (52) is located directly below the upper marking roller (51); the lead-out roller (66) is located at the discharge port of the equipment housing (1), and the lead-out roller (66) is lower than the re-marking roller (52); and a film adjustment groove (101) is cut at the outer end of the equipment housing (1); The two marking modules are respectively mounted on an upper marking roller (51) and a re-marking roller (52); the timing module is mounted on the inner wall of the device housing (1), and the timing module corresponds to the upper marking roller (51); the upper marking roller (51) and the re-marking roller (52) are both hollow structures, and the hollow structures are filled with marking liquid; a plurality of marking holes (501) are drilled on the upper marking roller (51); the axis extension lines of the marking holes (501) intersect perpendicularly with the central axis of the upper marking roller (51); the marking module comprises a support bar (71) fixedly connected to the inner wall of the upper marking roller (51); a plurality of marking bars (8) respectively located in the plurality of marking holes (501); and an electric push rod (72) fixedly connected between the support bar (71) and the marking bar (8).

2. The flexible PP vehicle film stretching and forming equipment according to claim 1, characterized in that: The length of the bottom plate (41) is greater than the longitudinal span of the discharge port, and the upper surface of the marking line (42) is coated with a bright paint layer.

3. The flexible PP vehicle film stretching and forming equipment according to claim 1, characterized in that: The marking strip (8) comprises a sealing section (83) fixedly connected to the extended end of the electric push rod (72), a liquid guiding section (82) fixedly connected to the upper end of the sealing section (83), and a marking section (81) fixedly connected to the upper end of the liquid guiding section (82); the sealing section (83) is made of elastic rubber material, the marking section (81) is made of water-absorbing material, and both the sealing section (83) and the marking section (81) are interference fit with the marking hole (501), and the outer surface of the liquid guiding section (82) is in contact with the inner wall of the marking hole (501).

4. The flexible PP vehicle film stretching and forming equipment according to claim 3, characterized in that: The liquid conducting section (82) comprises an inner conductive strip (822) located on the outside and an outer liquid collecting shell (821) located on the inside of the inner conductive strip (822); one end of the outer liquid collecting shell (821) is fixedly connected to the sealing section (83); the other end of the outer liquid collecting shell (821) is fixedly extended into the marking section (81); the two ends of the inner conductive strip (822) are respectively fixedly connected to the edges of the marking section (81) and the sealing section (83); and a plurality of liquid permeable holes (801) are drilled at the outer end of one side of the inner conductive strip (822) close to the sealing section (83).

5. The flexible PP vehicle film stretching and forming equipment according to claim 4, characterized in that: The length of the outer liquid-collecting shell (821) within the marking section (81) is no greater than half the length of the sealing section (83), and the outer liquid-collecting shell (821) is made of a hard water-absorbent material.

6. The flexible PP vehicle film stretching and forming equipment according to claim 1, characterized in that: The colors of the marking liquid in the upper marking roller (51) and the marking roller (52) and the colors of the marking lines (42) are different, and the three colors are contrasting colors. The upper marking roller (51) and the marking roller (52) only rotate when the marking module marks the vehicle film, and the mouths of the marking holes (501) on the upper marking roller and the vehicle film are not in contact with the mouth of the marking hole (501).

7. The flexible PP vehicle film stretching and forming equipment according to claim 1, characterized in that: The preheating roller (62) is a hollow structure, and a plurality of heat detection units (9) distributed in a ring array are fixedly connected inside the preheating roller (62), and the heat detection units (9) are recessed from both ends to the middle.

8. The flexible PP vehicle film stretching and forming equipment according to claim 7, characterized in that: The heat detection unit (9) comprises a connecting rod (91) fixedly connected to the inner wall of the preheating roller (62), two test inclined rods (92) respectively fixedly connected between the two ends of the connecting rod (91) and the inner wall of the preheating roller (62), a detection ball (93) is placed in the test inclined rod (92), and a pressure sensor (94) is installed at one end of the test inclined rod (92) away from the connecting rod (91), the pressure sensor (94) is connected to the control chip signal, and the test inclined rod (92) is also filled with hot melt filler.

9. The flexible PP vehicle film stretching and forming equipment according to claim 8, characterized in that: The hot melting temperature of the hot melting filler is consistent with the preheating temperature of the vehicle film when it is stretched, and the acute angle formed between the test inclined rod (92) and the horizontal plane is 5-10°.

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