Full-automatic two-component mixing glue injection system

Abstract

The utility model relates to a full-automatic double-component mixing glue injection system, which belongs to the field of glue injection systems and comprises a mixing gun head, an output end of the mixing gun head is connected with a mold, the mixing gun head is provided with two input ends, the two input ends are both connected with an input unit, and the input unit is connected with a glue injection unit. The input unit comprises a tank body, a first pipeline, a second pipeline, a third pipeline, a single piston pump and a three-way valve, the output end of the tank body is connected with the single piston pump through the first pipeline, and the second pipeline is connected with the single piston pump. The stable output flow is improved, and the glue output of the gun head does not need to be calibrated every time; according to the production of different types of composite materials, the equipment provides two working modes of a cross flow mode and a constant pressure mode for customers to select, so that the consistency of glue injection flow or pressure is ensured, and the qualified rate of produced products is improved.

Description

Technical Field

[0001] The utility model relates to a full-automatic two-component mixing glue injection system, belonging to the field of glue injection systems. Background Art

[0002] The pultrusion process is to form and solidify the raw materials through an extrusion die under the action of traction, and continuously produce profiles of unlimited length. During the pultrusion process, it is necessary to mix multiple glues and inject them into the mold of the composite material product at the required speed and pressure using a glue injection machine. Among them, the pump is a machine used in the glue injection machine to increase the pressure of the glue and make the glue flow. The pump transmits the mechanical energy of the prime mover or other external energy to the liquid, increasing the energy of the liquid.

[0003] The Chinese utility model patent with application number CN202322581703.5 discloses a composite material injection system. The composite material injection system includes an isocyanate feeding module, an isocyanate tank module, a polyol feeding module, a polyol tank module, a release agent tank module, a mixing module, a high and low pressure switching valve, a hydraulic control module and an electrical control module. The isocyanate feeding module is connected to the isocyanate tank module; the polyol feeding module is connected to the polyol tank module; the isocyanate tank module, the polyol tank module, and the release agent tank module are connected to the mixing module through an input pipeline and a circulation pipeline respectively; the electrical control module is connected to the isocyanate feeding module, the isocyanate tank module, the polyol feeding module, the polyol tank module, the release agent tank module and the hydraulic control module respectively. The composite material injection system provided by the utility model can realize automatic control from raw materials to molds and reduce the cost of injection. However, in the prior art, the accuracy of the mixing ratio of various glues cannot be guaranteed, there is no online feedback of the mixing ratio, and the injection pressure of the glue injected into the mold after mixing varies greatly, which affects the consistency of the product and the glue flow rate is unstable.

[0004] Therefore, there is a need for a fully automatic two-component mixing and injection system to improve the accuracy of the glue discharge ratio and the stability of the glue discharge flow rate. Summary of the invention

[0005] The technical problem to be solved by the utility model is: in order to overcome the deficiencies of the prior art, to provide a fully automatic two-component mixing glue injection system which can improve the glue dispensing ratio accuracy and glue dispensing flow stability.

[0006] The technical solution adopted by the utility model to solve the above-mentioned problem is: a fully automatic two-component mixing and injection system, including a mixing gun head, the output end of the mixing gun head is connected to the mold, the mixing gun head is provided with two input ends, the two input ends are connected to an input unit, the input unit includes a tank body, a first pipeline, a second pipeline, a third pipeline, a single-piston pump and a three-way valve, the output end of the tank body is connected to the single-piston pump through the first pipeline, the second pipeline is connected to the single-piston pump, the third pipeline is connected to the output end of the tank body, the second pipeline, the third pipeline and the mixing gun head are respectively connected to the three ports of the three-way valve, and the second pipeline is installed with a system pressure gauge, a pressure sensor and a flow sensor.

[0007] Preferably, the tank body is provided with a heater, a liquid level sensor, a temperature sensor and a stirrer.

[0008] Preferably, a ball valve and a filter are installed on the first pipeline.

[0009] Preferably, the second pipeline and the third pipeline are connected via a pressure relief pipe, and a system pressure regulating valve is installed on the pressure relief pipe.

[0010] Preferably, the three-way valve is controlled by a gas source triplex;

[0011] The mixing gun head is connected to a gun head cleaning unit, and the mixing gun head is cleaned by the gun head cleaning unit;

[0012] The gun tip cleaning unit is connected to the gas source triplex.

[0013] Preferably, the single-piston pump comprises a pump body and a piston rod, an end cover is provided at one end of the pump body, the piston rod passes through the end cover, the piston rod and the end cover are slidably and sealingly connected, the piston rod divides the inner cavity of the pump body into a rodless cavity and a rod cavity, the rodless cavity is connected to a first pipe, and the rod cavity is connected to a second pipe, the outer end of the piston rod is connected to a driving device, and the driving device drives the piston rod to reciprocate in the pump body along the length direction of the piston rod.

[0014] Preferably, a flushing cavity is provided on the end cover, and the flushing cavity is connected to a flushing device.

[0015] Preferably, the flushing device includes a flushing bucket, the output end of the flushing bucket is connected to the flushing chamber through a first flushing pipe, the input end of the flushing bucket is connected to the flushing chamber through a second flushing pipe, the first flushing pipe is connected to a flushing pressure regulating valve and a flushing motor pump group, and the second flushing pipe is connected to a flushing flow regulating valve.

[0016] Preferably, the driving device comprises a servo electric cylinder, and the output end of the servo electric cylinder is connected to the outer end of the piston rod through a pin.

[0017] Preferably, the single-piston pump also includes a control valve group, which includes an input pipe, an output pipe and a connecting pipe. The input pipe is connected to the input end of the pump body, and the output pipe is connected to the output end of the pump body. A first one-way valve is installed on the input pipe. The input pipe and the output pipe are connected through a connecting pipe. A second one-way valve is installed on the connecting pipe. The connecting end of the connecting pipe and the input pipe is located between the first one-way valve and the pump body. One end of the input pipe is connected to the rodless cavity, and the other end of the input pipe is connected to the first pipeline. One end of the output pipe is connected to the rod cavity, and the other end of the output pipe is connected to the second pipeline.

[0018] Compared with the prior art, the advantages of the utility model are:

[0019] 1. By configuring a flow sensor and forming a PID closed-loop control with a single piston pump, the glue dispensing ratio accuracy is improved, the stable output flow rate is increased, and there is no need to calibrate the glue dispensing gun head every time;

[0020] 2. According to the production of different types of composite materials, the equipment provides two working modes: "cross flow mode" and "constant pressure mode" for customers to choose, to ensure the consistency of injection flow or pressure and improve the qualified rate of production products;

[0021] 3. Through high-pressure flushing of the flushing cavity, the number of maintenance times is reduced, the stability of the equipment is improved, and the circulating lubrication of the flushing cavity is also achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a structural schematic diagram of a fully automatic two-component mixing and injection system of the utility model;

[0023] Figure 2 is the system diagram of the input unit;

[0024] Figure 3 It is a system diagram of a single piston pump, a drive device, a flushing device and a control valve group;

[0025] Figure 4 It is a three-dimensional diagram of the connection structure of a single piston pump, a driving device, a flushing device and a control valve group;

[0026] Figure 5 A cross-sectional view of a single piston pump.

[0027] in:

[0028] Mixing gun tip 100, mold 200, input unit 300, gun tip cleaning unit 400;

[0029] Tank 301, first pipeline 302, second pipeline 303, third pipeline 304, single piston pump 305, three-way valve 306, heater 307, liquid level sensor 308, temperature sensor 309, stirrer 310, system pressure gauge 311, pressure sensor 312, flow sensor 313, pressure relief pipe 314, system pressure regulating valve 315, air source triplex 316; drive device 317, flushing device 318, control valve group 319;

[0030] Pump body 3051, piston rod 3052, end cover 3053, rodless chamber 3054, rod chamber 3055, sealing ring 3056, flushing chamber 3057;

[0031] Servo electric cylinder 3171, pin shaft 3172;

[0032] A flushing barrel 3181, a first flushing pipe 3182, a second flushing pipe 3183, a flushing pressure regulating valve 3184, a flushing motor pump group 3185, and a flushing flow regulating valve 3186;

[0033] Input pipe 3191 , output pipe 3192 , connecting pipe 3193 , first one-way valve 3194 , second one-way valve 3195 . DETAILED DESCRIPTION

[0034] like Figure 1-5 As shown, a fully automatic two-component mixing and injection system in this embodiment includes a mixing gun head 100, the output end of the mixing gun head 100 is connected to the mold 200, and the mixing gun head 100 is provided with two input ends, and the two input ends are connected to the input unit 300;

[0035] The input unit 300 includes a tank body 301, a first pipeline 302, a second pipeline 303, a third pipeline 304, a single piston pump 305 and a three-way valve 306. The tank body 301 is provided with a heater 307, a liquid level sensor 308, a temperature sensor 309 and an agitator 310. The output end of the tank body 301 is connected to the single piston pump 305 through the first pipeline 302. The first pipeline 302 is installed with a ball valve and a filter. The second pipeline 303 is connected to the single piston pump 305. The third pipeline 304 is connected to the output end of the tank body 301. The second pipeline 303, the third pipeline 304 and the mixing gun head 100 are respectively connected to the three ports of the three-way valve 306. The second pipeline 303 is installed with a system pressure gauge 311, a pressure sensor 312 and a flow sensor 313. The second pipeline 303 and the third pipeline 304 are connected through a pressure relief pipe 314. The pressure relief pipe 314 is installed with a system pressure regulating valve 315;

[0036] The three-way valve 306 is controlled by the gas source triplex 316;

[0037] The mixing gun head 100 is connected to a gun head cleaning unit 400, and the mixing gun head 100 is cleaned by the gun head cleaning unit 400;

[0038] The gun tip cleaning unit 400 is connected to the gas source triplex 316;

[0039] The single piston pump 305 includes a pump body 3051 and a piston rod 3052. An end cover 3053 is provided at one end of the pump body 3051. The piston rod 3052 passes through the end cover 3053. The piston rod 3052 and the end cover 3053 are slidably and sealedly connected. The piston rod 3052 divides the cavity in the pump body 3051 into a rodless cavity 3054 and a rod cavity 3055. The rodless cavity 3054 is connected to the first pipeline 302, and the rod cavity 3055 is connected to the second pipeline 303. The outer end of the piston rod 3052 is connected to the driving device 317. The driving device 317 drives the piston rod 3052 to move in the pump body 3051 along the length of the piston rod 3052. The end cover 3053 reciprocates in the direction of degrees, the end cover 3053 is connected to the piston rod 3052 through two sealing rings 3056, the two sealing rings 3056 are spaced apart along the length direction of the piston rod 3052, a flushing cavity 3057 is arranged on the end cover 3053, the flushing cavity 3057 is located between the two sealing rings 3056, the flushing cavity 3057 is connected to the flushing device 318, powder fillers and color paste are added to the glue, the powder fillers and color paste are easy to enter between the piston rod 3052 and the end cover 3053, and the powder fillers and color paste between the piston rod 3052 and the end cover 3053 are flushed away by the flushing device 318, so as to avoid blockage, reduce the number of maintenance times, and improve the stability of the equipment;

[0040] The flushing device 318 includes a flushing bucket 3181, the output end of the flushing bucket 3181 is connected to the flushing chamber 3057 through a first flushing pipe 3182, and the input end of the flushing bucket 3181 is connected to the flushing chamber 3057 through a second flushing pipe 3183. The first flushing pipe 3182 is connected to a flushing pressure regulating valve 3184 and a flushing motor pump group 3185, and the second flushing pipe 3183 is connected to a flushing flow regulating valve 3186. During the start-up of the flushing motor pump group 3185, the flushing liquid in the flushing bucket 3181 is discharged from the first flushing pipe 3184 to the flushing chamber 3057. 82 is transported to the flushing chamber 3057, and the flushing liquid in the flushing chamber 3057 flows back to the flushing barrel 3181 from the second flushing pipe 3183. During the reciprocating movement of the piston rod 3052, the powder filler and the color paste between the piston rod 3052 and the end cover 3053 enter the flushing chamber 3057. With the directional flow of the cleaning liquid in the flushing chamber 3057, the powder filler and the color paste in the flushing chamber 3057 are flushed out of the flushing chamber 3057, that is, the powder filler and the color paste in the flushing chamber 3057 are cleared, thereby avoiding blockage, reducing the number of maintenance times, and improving the stability of the equipment;

[0041] The driving device 317 includes a servo electric cylinder 3171, the output end of which is connected to the outer end of the piston rod 3052 via a pin shaft 3172. During the start-up of the servo electric cylinder 3171, the output end of the servo electric cylinder 3171 drives the piston rod 3052 to reciprocate on the pump body 3051 via the pin shaft 3172.

[0042] The single piston pump 305 further includes a control valve group 319, which includes an input pipe 3191, an output pipe 3192 and a connecting pipe 3193. The input pipe 3191 is connected to the input end of the pump body 3051, and the output pipe 3192 is connected to the output end of the pump body 3051. A first check valve 3194 is installed on the input pipe 3191. The input pipe 3191 and the output pipe 3192 are connected via the connecting pipe 3193. A second one-way valve 3195 is installed on the connecting pipe 3193. The connecting end of the connecting pipe 3193 and the input pipe 3191 is located between the first one-way valve 3194 and the pump body 3051. One end of the input pipe 3191 is connected to the rodless cavity 3054, and the other end of the input pipe 3191 is connected to the first pipeline 302. One end of the output pipe 3192 is connected to the rod cavity 3055, and the other end of the output pipe 3192 is connected to the second pipeline 303.

[0043] Here, the control valve group 319 and the pump body 3051 are separated to facilitate subsequent maintenance;

[0044] Glue liquids of different components are added to the two tanks 301 respectively, and the height of the glue liquid is detected and fed back in real time by the liquid level sensor 308. The program is automatically set to stop feeding when the filling is 80% to prevent the glue liquid from overflowing from the tank 301. Then, the stirrer 310 is started to stir and defoam the glue liquid. The glue liquid in the tank 301 is heated by the heater 307, and the temperature of the glue liquid is detected and fed back in real time by the temperature sensor 309. When the glue liquid reaches the set temperature, the heating is automatically stopped, and when it is lower than the set temperature, the heating function is automatically turned on;

[0045] When the mold 200 needs to be injected with glue, the single piston pump 305 works, the servo electric cylinder 3171 is started, and the output end of the servo electric cylinder 3171 drives the piston rod 3052 to move back and forth on the pump body 3051 through the pin shaft 3172. When the piston rod 3052 moves away from the rodless cavity 3054, the glue in the tank body 301 is successively transported from the first pipeline 302 and the input pipe 3191 to the rodless cavity 3054, and the glue in the rod cavity 3055 is transported from the output pipe 3192 to the second pipeline 303. Due to the one-way characteristic of the second one-way valve 3195, the glue in the second pipeline 303 cannot be transported from the connecting pipe 3193 to the input pipe 3191. When the piston rod 3052 moves in the direction away from the rodless cavity 3054, the glue in the tank body 301 is transported from the first pipeline 302 and the input pipe 3191 to the rodless cavity 3054, and the glue in the rod cavity 3055 is transported from the output pipe 3192 to the second pipeline 303. Due to the one-way characteristic of the second one-way valve 3195, the glue in the second pipeline 303 cannot be transported from the connecting pipe 3193 to the input pipe 3191. When 3052 moves in the reverse direction, the glue in the rodless chamber 3054 is transported to the input pipe 3191, and the one-way characteristic of the first one-way valve 3194 prevents the glue in the input pipe 3191 from being transported to the first pipe 302, and the glue in the input pipe 3191 can only be transported from the connecting pipe 3193 to the output pipe 3192, and a part of the glue in the output pipe 3192 flows back to the rod chamber 3055, and another part of the glue in the output pipe 3192 is transported to the second pipe 303, and the cycle is repeated to realize continuous glue discharge from the second pipe 303, and the glue in the second pipe 303 is transported from the three-way valve 306 to the mixing gun head 100 and then to the mold 200;

[0046] When the mold 200 stops injecting glue, the glue liquid in the second pipe 303 is transported from the three-way valve 306 to the third pipe 304 and then flows back to the tank body 301, so as to realize the circulation of the glue liquid in the tank body 301 and avoid the precipitation of the glue liquid;

[0047] During the glue injection process of the mold 200, when the gun tip is blocked, after the pressure in the second pipe 303 increases to the set pressure of the system pressure regulating valve 315, the glue in the second pipe 303 flows back to the tank 301 from the pressure relief pipe 314 and the third pipe 304 in turn to avoid excessive pressure;

[0048] The three-way valve 306 is controlled by the air source triplex 316, that is, the second pipeline 303 is controlled to be connected with the mixing gun head 100 or the second pipeline 303 is controlled to be connected with the third pipeline 304, so that the glue liquid in the two tanks 301 enters the mixing gun head 100 for mixing and injection according to the set ratio, thereby improving the glue ratio accuracy;

[0049] In addition, when the mold 200 stops injecting glue and the mixing gun head 100 needs to be cleaned, there are two cleaning modes;

[0050] First cleaning mode: The cleaning agent is delivered to the mixing gun head 100 through the gun head cleaning unit 400 to clean the mixing gun head 100;

[0051] Second cleaning mode: air is delivered to the mixing gun head 100 through the air source triplex 316 to achieve air cleaning of the mixing gun head 100;

[0052] When the mixing gun head 100 is cleaned, the first cleaning mode and the second cleaning mode are performed alternately to improve the cleaning effect of the mixing gun head 100;

[0053] Secondly, during the start-up of the single piston pump 305, the flushing motor pump group 3185 is started, and the flushing liquid in the flushing barrel 3181 is transported from the first flushing pipe 3182 to the flushing chamber 3057, the pressure in the flushing chamber 3057 increases, and the flushing liquid in the flushing chamber 3057 flows back to the flushing barrel 3181 from the second flushing pipe 3183. During the reciprocating movement of the piston rod 3052, the powder filler and color paste between the piston rod 3052 and the end cover 3053 enter the flushing chamber 3057. With the directional flow of the cleaning liquid in the flushing chamber 3057, the powder filler and color paste in the flushing chamber 3057 are flushed out of the flushing chamber 3057, that is, high-pressure flushing of the flushing chamber 3057 is achieved, and the piston rod 3052 and the end cover 3053 are prevented from getting stuck, the number of maintenance times is reduced, and the stability of the equipment is improved. In fact, the flushing liquid also has a lubricating effect, which achieves circulating lubrication of the flushing chamber 3057 and reduces the friction between the piston rod 3052 and the end cover 3053.

[0054] By recording the usage time of each single piston pump 305, Table 1 is obtained:

[0055] Table 1: Single piston pump 305 usage time comparison table

[0056]

[0057] According to Table 1, it can be concluded that the single piston pump 305 adopts circulating lubrication and high-pressure circulating flushing, which effectively prolongs the service life of the single piston pump 305, reduces the number of maintenance times, and improves the stability of the equipment;

[0058] Here, during the injection molding of the mold 200, the system has the following two modes:

[0059] Cross-flow mode: During the glue injection process, the flow sensor 313 detects and feeds back the real-time flow rate, compares it with the set value, and adjusts the glue output of the single piston pump 305 through PID closed-loop control, that is, controls and adjusts the speed of the servo electric cylinder 3171, thereby improving the glue output ratio accuracy and stabilizing the output flow rate;

[0060] Constant pressure mode: During the glue injection process, the pressure sensor 312 detects and feeds back the real-time pressure value of the mold 200, and compares it with the set pressure value. The glue output of the single piston pump 305 is adjusted through PID closed-loop control, that is, the speed of the servo electric cylinder 3171 is controlled to keep the pressure of the mold 200 cavity constant;

[0061] According to the production of different types of composite materials, different modes are selected to ensure the consistency of injection flow or pressure and improve the qualified rate of production products;

[0062] Of course, one or more gun tips can be provided to achieve independent output of a single-mixing gun tip 100 and a multi-mixing gun tip 100 .

[0063] In addition to the above embodiments, the present invention also includes other implementation modes. Any technical solutions formed by equivalent transformation or equivalent replacement should fall within the protection scope of the claims of the present invention.

Claims

1. A fully automatic two-component mixing and injection system, comprising a mixing gun head (100), wherein an output end of the mixing gun head (100) is connected to a mold (200), and the mixing gun head (100) is provided with two input ends, both of which are connected to an input unit (300), characterized in that: The input unit (300) comprises a tank body (301), a first pipeline (302), a second pipeline (303), a third pipeline (304), a single piston pump (305) and a three-way valve (306); the output end of the tank body (301) is connected to the single piston pump (305) via the first pipeline (302); the second pipeline (303) is connected to the single piston pump (305); the third pipeline (304) is connected to the output end of the tank body (301); the second pipeline (303), the third pipeline (304) and the mixing gun head (100) are respectively connected to the three ports of the three-way valve (306); and the second pipeline (303) is installed with a system pressure gauge (311), a pressure sensor (312) and a flow sensor (313).

2. The fully automatic two-component mixing and injection system according to claim 1, characterized in that: The tank body (301) is provided with a heater (307), a liquid level sensor (308), a temperature sensor (309) and a stirrer (310).

3. The fully automatic two-component mixing and injection system according to claim 1 is characterized in that: A ball valve and a filter are installed on the first pipeline (302).

4. The fully automatic two-component mixing and injection system according to claim 1 is characterized in that: The second pipeline (303) and the third pipeline (304) are connected via a pressure relief pipe (314), and a system pressure regulating valve (315) is installed on the pressure relief pipe (314).

5. The fully automatic two-component mixing and injection system according to claim 1 is characterized in that: The three-way valve (306) is controlled by a gas source triplex (316); The mixing gun tip (100) is connected to a gun tip cleaning unit (400), and the mixing gun tip (100) is cleaned by the gun tip cleaning unit (400); The gun tip cleaning unit (400) is connected to the gas source triplex (316).

6. The fully automatic two-component mixing and injection system according to claim 1 is characterized in that: The single piston pump (305) comprises a pump body (3051) and a piston rod (3052); an end cover (3053) is provided at one end of the pump body (3051); the piston rod (3052) passes through the end cover (3053); the piston rod (3052) and the end cover (3053) are slidably and sealedly connected; the piston rod (3052) divides the cavity in the pump body (3051) into a rodless cavity (3054) and a rod cavity (3055); the rodless cavity (3054) is connected to a first pipe (302); the rod cavity (3055) is connected to a second pipe (303); the outer end of the piston rod (3052) is connected to a driving device (317); the driving device (317) drives the piston rod (3052) to reciprocate in the pump body (3051) along the length direction of the piston rod (3052).

7. The fully automatic two-component mixing and injection system according to claim 6, characterized in that: The end cover (3053) is provided with a flushing cavity (3057), and the flushing cavity (3057) is connected to the flushing device (318).

8. The fully automatic two-component mixing and injection system according to claim 7, characterized in that: The flushing device (318) comprises a flushing bucket (3181); the output end of the flushing bucket (3181) is connected to the flushing chamber (3057) via a first flushing pipe (3182); the input end of the flushing bucket (3181) is connected to the flushing chamber (3057) via a second flushing pipe (3183); the first flushing pipe (3182) is connected to a flushing pressure regulating valve (3184) and a flushing motor pump group (3185); and the second flushing pipe (3183) is connected to a flushing flow regulating valve (3186).

9. The fully automatic two-component mixing and injection system according to claim 6, characterized in that: The driving device (317) comprises a servo electric cylinder (3171), and the output end of the servo electric cylinder (3171) is connected to the outer end of the piston rod (3052) via a pin shaft (3172).

10. The fully automatic two-component mixing and injection system according to claim 1, characterized in that: The single-piston pump (305) further comprises a control valve group (319), wherein the control valve group (319) comprises an input pipe (3191), an output pipe (3192) and a connecting pipe (3193), wherein the input pipe (3191) is connected to the input end of the pump body (3051), and the output pipe (3192) is connected to the output end of the pump body (3051). A first check valve (3194) is installed on the input pipe (3191), and the input pipe (3191) and the output pipe (3192) are connected via a connecting pipe (3193). A second one-way valve (3195) is installed on the connecting pipe (3193); the connecting end of the connecting pipe (3193) and the input pipe (3191) is located between the first one-way valve (3194) and the pump body (3051); one end of the input pipe (3191) is connected to the rodless chamber (3054); the other end of the input pipe (3191) is connected to the first pipeline (302); one end of the output pipe (3192) is connected to the rod chamber (3055); and the other end of the output pipe (3192) is connected to the second pipeline (303).

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