SMC (Sheet Molding Compound) composite material gluing equipment

Abstract

The SMC composite material gluing equipment comprises a glue tank, the glue tank comprises a front plate, a rear plate, a left side plate and a right side plate, the cross section of the glue tank is in a V shape, a glue outlet is formed in the bottom of the V shape in the breadth direction of the glue tank, a gluing roller is arranged below the glue outlet and can rotate under the control of a motor, and the rotating direction of the gluing roller is consistent with the speed direction of a bearing film. The problem of fiber content of the SMC sheet caused by unstable gluing of the traditional SMC composite material is solved, so that the defect of non-uniform distribution of subsequent SMC mould pressing fibers is avoided; the loss of resin paste in the production process can be reduced, waste is reduced, the gap between the gluing roller and the bearing film can be adjusted online, the production efficiency is improved, and the equipment is easy to operate.

Description

Technical Field

[0001] The invention relates to the field of composite materials, and in particular to a SMC composite material gluing device. Background Art

[0002] The SMC production line consists of processes such as glue coating, fiber cutting, and fiber impregnation. The glue coating system and fiber cutting determine the uniformity of resin coating and fiber scattering. Figure 1-2 The glue tank of the traditional glue coating system has a rectangular cross section and a quadrilateral bottom. It is open and has a scraper at the bottom of the glue tank. The resin paste is usually stirred by an AB pump and then pumped into the glue tank. The thickness of the resin paste is then controlled by controlling the gap between the scraper at the bottom of the glue tank and the plane of the carrier film. This type of glue tank and glue coating method has the following problems: (1) The resin paste is stirred by the AB pump and then pumped into the glue tank. Usually, the resin paste will flow into the glue tank from the center. Therefore, the resin paste will accumulate in the middle of the glue tank and gradually decrease towards the sides, resulting in uneven distribution. The pressure in the middle is high and the pressure on the sides is low, which will affect the uniformity of the surface density of the resin paste applied on the film. Generally, the surface density of the resin paste is high in the middle and low at both ends. In particular, the higher the viscosity of the resin paste, the more serious this problem is. In addition, when the subsequent fibers are scattered evenly, it will indirectly lead to low fiber content in the middle and high fiber content at both ends, affecting the uniformity of the SMC material, and ultimately affecting the uniformity of fiber distribution after the product is molded.

[0003] (2) Since the glue tank is open, the resin paste is affected by the ambient temperature, which causes the viscosity of the resin paste to change, and ultimately leads to large fluctuations in the density of the resin paste after coating.

[0004] (3) In addition, in this type of glue tank, the resin paste applied to the film will have peaks at the beginning and end of each production, resulting in a lack of resin paste in some areas, which cannot be used for subsequent preparation of composite products, resulting in certain waste; (4) The height of the glue groove is controlled by the gasket. When the amount of resin paste applied fluctuates, the machine needs to be stopped to adjust the thickness of the gasket to adjust the gap of the glue groove. This is very annoying and will also cause a certain amount of resin paste waste. (5) If an abnormality occurs during the production process, the glue in the upper and lower glue grooves will flow out along the gap between the glue grooves, which will not only cause waste, but the resin will also flow out under the squeeze of the chain belt, causing pollution to the equipment. Summary of the invention

[0005] The invention provides a glue coating device for producing SMC composite materials, so as to achieve glue coating uniformity in the SMC preparation process, avoid uneven content of SMC resin or fiber to cause a series of subsequent product quality problems, and improve production efficiency.

[0006] The technical solution provided by the present invention is: A SMC composite material gluing device comprises a glue groove, wherein the glue groove comprises a front plate, a rear plate, and left and right side plates, and has a V-shaped cross section. A glue outlet is arranged at the bottom of the V-shape along the width direction of the glue groove, and a glue coating roller is arranged below the glue outlet. The glue roller can rotate under the control of a motor, and the rotation direction is consistent with the speed direction of a carrier film.

[0007] In this embodiment, the glue groove is designed to be a V-shaped structure. Compared with a rectangular structure, the amount of resin paste required in the glue groove can be less, and the injected resin paste can quickly flow from the middle position of the glue groove to both ends; in addition, the V-shaped structure glue outlet has less resin paste in contact with the carrier film; after flowing out of the glue outlet, the resin is transferred to the rotating glue coating roller below, and the glue coating roller further transfers the glue layer evenly to the carrier film as it rotates, so that the lateral quantitative difference is controlled to a minimum.

[0008] In another embodiment, the two ends of the front plate and the rear plate respectively abut the left and right side plates, and the two ends of the upper sides of the front plate and the rear plate are also connected to the left and right sides respectively by bolts, and the lower sides of the front plate and the rear plate swing around the center axis of the bolts, so that the size of the glue outlet can be controlled.

[0009] In another embodiment, the SMC composite material glue coating equipment further comprises a heating device, which is connected to the glue tank to heat and keep the glue tank warm. The heating device can be a heating plate, which can be arranged on the front plate and the rear plate of the glue tank; or a heating pipeline is arranged in the front plate and / or the rear plate of the glue tank, and the heating pipeline is connected to the mold temperature controller.

[0010] In this embodiment, the heating device can heat and keep the glue tank warm, thereby ensuring that the temperature of the resin paste in the glue tank is consistent and stable. When the temperature of the resin paste is stable, its viscosity can be kept stable, and the amount of resin coated on the carrier film can also be kept stable.

[0011] In another embodiment, the SMC composite material gluing equipment further includes an adjusting device, and the adjusting device includes a glue groove upper and lower position adjusting device and a glue outlet adjusting device. The glue groove upper and lower position adjusting device is connected to the outer sides of the left and right side panels, and can control the left and right side panels to move upward or downward, thereby controlling the vertical distance between the glue outlet and the glue coating roller. The glue outlet adjusting device includes an adjusting nut structure, which is arranged near the lower edge of the front plate and the rear plate to achieve the purpose of controlling the front plate and the rear plate to swing inward or outward, thereby controlling the size of the glue outlet; preferably, two are arranged on each of the front plate and the rear plate, respectively located at both ends. The glue outlet adjusting device also includes a dial indicator, which can cooperate with the nut adjustment structure to achieve precise adjustment of the size of the glue outlet.

[0012] Beneficial effects of the technical solution of the present invention: (1) The problem of unstable glue coating of traditional SMC composite materials, which leads to the fiber content of SMC sheets, is solved, thereby avoiding the defect of uneven fiber distribution in subsequent SMC molding; (2) It can reduce the loss of resin paste in the production process and reduce waste. The gap between the coating roller and the carrier film can be adjusted online to improve production efficiency. The equipment is easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the traditional glue tank structure; Figure 2 This is a schematic diagram of the cross section of a traditional glue tank; Figure 3 This is a schematic diagram of the structure of the glue tank of the present invention; Figure 4 This is a front view of the glue tank of the present invention; Figure 5 It is a schematic diagram of the cross section of the glue tank of the present invention; Figure 6 It is a schematic diagram of the glue outlet adjustment device of the present invention; Figure 7 This is a schematic diagram of the gluing effect of traditional gluing equipment; Figure 8 This is a schematic diagram of the gluing effect of the gluing device of the present invention; Fig. 9 This is a schematic diagram of the sampling position for the single weight test of resin paste; Among them: 1-carrying film; 2-glue groove; 21-front plate; 22-rear plate; 23-left side; 24-right side plate; 25-bottom plate; 3-glue coating roller; 4-mold temperature controller; 5-glue outlet adjustment device; 51-nut adjustment structure; 52-dial indicator; 6-motor; 7-bolt. DETAILED DESCRIPTION

[0014] In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0015] See attached Figure 3-5 A SMC composite material gluing device includes a glue groove 2, wherein the glue groove 2 includes a front plate 21, a rear plate 22, a left plate 23, and a right plate 24, and its cross section is V-shaped. A glue outlet is arranged at the bottom of the V-shape along the width direction of the glue groove, and a glue coating roller 3 is arranged below the glue outlet. The glue coating roller 3 can rotate under the control of a motor 6, and its rotation direction is consistent with the speed direction of a carrier film 1.

[0016] The two ends of the front plate 21 and the rear plate 22 are respectively abutted against the left plate 23 and the right plate 24, and the two ends of the upper sides of the front plate 21 and the rear plate 22 are also respectively connected to the left plate 23 and the right plate 24 through bolts 7, and the lower sides of the front plate 21 and the rear plate 22 swing around the central axis of the bolts 7, so that the size of the glue outlet can be controlled.

[0017] The SMC composite material glue coating equipment also includes a heating device, which is connected to the glue tank to heat and keep the glue tank warm. The heating device includes a mold temperature controller 4 and a heating pipeline (not shown in the figure), which is arranged in the glue tank front plate 21 and / or the rear plate 22 and connected to the mold temperature controller 4.

[0018] The SMC composite material glue coating equipment also includes an adjustment device, which includes a glue groove up and down position adjustment device (not shown in the figure) and a glue outlet adjustment device 5. The glue groove up and down position adjustment device is arranged on the support frame and connected to the outer sides of the left side plate 23 and the right side plate 24 (not shown in the figure), and can control the left side plate 23 and the right side plate 24 to move upward or downward, thereby controlling the vertical distance between the glue outlet and the glue coating roller 3. The glue outlet adjustment device 5 includes an adjustment nut structure 51, which is arranged at both ends of the front plate 21 and the rear plate 22 and close to the lower side position, so as to achieve the purpose of controlling the front plate 21 and the rear plate 22 to swing inward or outward, thereby controlling the size of the glue outlet. The glue outlet adjustment device 5 also includes a dial indicator 52, which can cooperate with the nut adjustment structure 51 to achieve precise adjustment of the glue outlet size.

[0019] The glue coating effects of the conventional glue coating equipment and the glue coating equipment of the present invention are compared. Comparison conditions: except for the glue coating equipment, the resin paste and other parameters used are the same, and the designed resin paste coating surface density is.

[0020] The first aspect is to compare the glue coating effect by visual inspection. Figure 6 , is a schematic diagram of the glue coating effect of traditional glue coating equipment. It can be seen that the distribution of resin paste in the glue tank spreads from the middle to the two ends, forming a situation where there is more in the middle and less at the two ends. In the initial glue coating stage after starting up, the distribution of resin paste on the carrier film is V-shaped. Similarly, at the end of preparation, it will also be V-shaped. This situation will cause waste at the head and end of the SMC. See the attached Figure 7 , is a schematic diagram of the gluing effect of the gluing device of the present invention. It can be seen that the resin paste is evenly distributed in the glue tank. When the machine is turned on, the resin paste can be evenly coated along the width direction of the carrier film, and the resin paste can be continuously and evenly coated on the carrier film.

[0021] The second aspect is to measure the uniformity of the resin paste coating. Test method: Cut 6 pieces of oil-absorbing cotton with a size of 150*150mm, then weigh the initial weight of each piece of oil-absorbing cotton, and record them as W1, W2, W3, W4, W5, and W6 respectively; select a normal glue-coated carrier film, refer to Figure 8 , lay oil-absorbing cotton in sequence along the resin paste coating width (1000mm), with a spacing of about 10mm between every two pieces of oil-absorbing cotton, press the oil-absorbing cotton with your hand to absorb the resin of the corresponding area into the oil-absorbing cotton, pick up the oil-absorbing cotton, weigh the weight after absorbing the resin in sequence, and record it as W1', W2', W3', W4', W5', W6' respectively, and then calculate the difference before and after absorbing the resin, that is, the weight of the resin paste absorbed by each piece of oil-absorbing cotton, and record it as △W1, △W2, △W3, △W4, △W5, △W6 respectively, and further calculate the difference in surface density of the resin paste in the width direction, see Table 1. It can be seen from the table data that the coating uniformity of the resin paste of the coating equipment of the present invention is more stable than that of the original coating method, the standard deviation of the resin unit weight is nearly increased by 14 times, and the standard deviation of the surface density is nearly increased by 10 times.

[0022] Table 1. Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A SMC composite material gluing device, comprising a gluing tank, characterized in that: The glue groove includes a front plate, a rear plate, and left and right side plates, and its cross-section is V-shaped. A glue outlet is arranged at the bottom of the V-shape along the width direction of the glue groove, and a glue coating roller is arranged below the glue outlet. The glue coating roller can rotate under the control of a motor, and its rotation direction is consistent with the speed direction of the carrier film.

2. The SMC composite material gluing equipment according to claim 1, characterized in that: The two ends of the front plate and the rear plate are respectively abutted against the left and right side plates, and the two ends of the upper sides of the front plate and the rear plate are also respectively connected to the left and right side plates by bolts, and the lower sides of the front plate and the rear plate swing around the central axis of the bolts, so that the size of the glue outlet can be controlled.

3. The SMC composite material gluing equipment according to claim 1, characterized in that: It also includes a heating device, which is connected to the glue tank to heat and keep the glue tank warm; the heating device includes a mold temperature controller and a heating pipeline, which is arranged in the front plate and / or the rear plate of the glue tank and connected to the mold temperature controller.

4. The SMC composite material gluing equipment according to claim 1, characterized in that: It also includes an adjusting device, which includes a glue groove up and down position adjusting device and a glue outlet adjusting device; the glue groove up and down position adjusting device is arranged on the left and right side plates, and can control the left and right side plates to move upward or downward, thereby controlling the vertical distance between the glue outlet and the glue coating roller; the glue outlet adjusting device includes an adjusting nut structure, which is arranged at both ends of the front plate and the rear plate near the lower side edge, and can control the front plate and the rear plate to swing inward or outward.

5. The SMC composite material gluing equipment according to claim 4, characterized in that: The glue outlet adjustment device also includes a dial indicator, which can cooperate with the nut adjustment structure to achieve precise adjustment of the glue outlet size.

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