Carbon dioxide foaming agent injection device

Abstract

The utility model belongs to the field of foamed plastic molding auxiliary equipment, and particularly relates to a carbon dioxide foaming agent injection device which comprises a main liquid inlet pipe, a main liquid discharge pipe and a mounting seat, two foaming agent pressurizing injection mechanisms are mounted on the mounting seat, the main liquid inlet pipe is connected with two branch liquid inlet pipes, the two branch liquid inlet pipes are both connected with electronic liquid inlet valves, and the electronic liquid inlet valves are connected with the main liquid discharge pipe. The two liquid inlet pipes are communicated with the cylinder barrel; the main liquid discharge pipe is connected with two branch liquid discharge pipes, the two branch liquid discharge pipes are both connected with electronic liquid discharge valves, and the two branch liquid discharge pipes are both communicated with a foaming agent pressurization injection mechanism. According to the carbon dioxide foaming agent injection device disclosed by the utility model, the two foaming agent pressurizing injection mechanisms are mutually matched and circulated by sucking and discharging, and are matched with the opening and closing of the electronic liquid inlet valve and the electronic liquid discharge valve, so that a high-pressure and quantitative carbon dioxide foaming agent can be stably conveyed, and the forming quality of foamed plastic is effectively ensured.

Description

Technical Field

[0001] The utility model relates to a carbon dioxide foaming agent injection device, belonging to the field of foam plastic molding auxiliary equipment. Background Art

[0002] Foam plastics are a type of polymer material formed by a large number of gas micropores dispersed in solid plastics. They have the characteristics of light weight, heat insulation, sound absorption, shock absorption, and better dielectric properties than the base resin. Therefore, they are widely used in daily necessities, packaging, industry, agriculture, transportation, military industry, aerospace industry and other fields. In the production and molding of foam plastics with high foaming ratio, it is necessary to add a foaming agent. Traditional technology usually uses Freon and alkane foaming agents. Freon foaming agents can destroy the ozone layer and cause serious pollution, so they are now listed as banned products. Alkane foaming agents have high application requirements due to safety issues such as flammability and explosion, and are not suitable for use.

[0003] At present, carbon dioxide as a blowing agent is a good alternative to traditional blowing agents. As a component of air, carbon dioxide can be produced from liquid air or as a by-product of the building materials and food industries. It is cheap, harmless to the atmospheric ozone layer, and has a high mass molar ratio. Carbon dioxide is used to replace traditional blowing agents, which not only has good environmental benefits, but also considerable economic benefits. Therefore, carbon dioxide has great advantages in industrial applications when used as a blowing agent.

[0004] At present, the injection of high-pressure liquid carbon dioxide mostly uses a plunger-type high-pressure reciprocating metering pump, but the output pressure and flow rate of this pump are not stable enough, which will have a great impact on the molding quality of foam plastics and it is difficult to meet the molding requirements of high-quality physical foaming plastics. Utility Model Content

[0005] In view of the above deficiencies in the prior art, the technical problem to be solved by the utility model is to provide a carbon dioxide foaming agent injection device which can stably and quantitatively output high-pressure liquid carbon dioxide.

[0006] The carbon dioxide foaming agent injection device described in the utility model comprises a main liquid inlet pipe, a main liquid discharge pipe and a mounting seat, on which two foaming agent pressurized injection mechanisms are installed, the foaming agent pressurized injection mechanism comprises a frame fixedly connected to the mounting seat, a linear guide assembly, a bearing seat and a cylinder barrel are fixedly connected to the frame, a piston is connected in the cylinder barrel, a piston rod is connected to the bottom of the piston, a ball screw is rotatably connected in the bearing seat, a ball screw nut is connected to the ball screw, the ball screw nut and the piston rod are both connected to the movable part of the linear guide assembly, and the ball screw is connected to a rotary drive assembly; the main liquid inlet pipe is connected to two branch liquid inlet pipes, both of which are connected to electronic liquid inlet valves, and both of which are connected to the cylinder barrel; the main liquid discharge pipe is connected to two branch liquid discharge pipes, both of which are connected to electronic liquid discharge valves, and both of which are connected to the cylinder barrel.

[0007] Furthermore, the linear guide assembly includes a linear guide rail arranged on a frame, a slider is slidably connected to the linear guide rail, and the ball screw nut and the piston rod are both fixedly connected to the slider.

[0008] Furthermore, the piston rod is a hollow structure, and the upper end of the ball screw is inserted into the center hole of the piston rod.

[0009] Furthermore, the rotary drive assembly includes a reducer fixed on the frame, the reducer is connected to the servo motor, a first gear is connected to the output shaft of the reducer, a second gear is installed on the ball screw, and the second gear is meshed with the first gear.

[0010] Furthermore, a storage cabinet is provided on the mounting base.

[0011] Furthermore, both the main liquid inlet pipe and the main liquid outlet pipe are provided with a one-way valve.

[0012] Furthermore, a cooling jacket is connected to the outer side of the cylinder.

[0013] Furthermore, a pressure sensor is connected to the cylinder.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] The carbon dioxide foaming agent injection device described in the utility model drives the ball screw to rotate through a rotary drive component, thereby steadily driving the piston rod to move through the ball screw nut, and the two piston rods react in the two cylinder barrels, and the two suck and discharge in a cycle, and cooperate with the opening and closing of the electronic liquid inlet valve and the electronic liquid discharge valve, so as to realize the stable delivery of high-pressure and quantitative carbon dioxide foaming agent, and effectively ensure the molding quality of foam plastics. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1It is a structural schematic diagram of the utility model;

[0017] Figure 2 It is a cross-sectional view of the foaming agent pressurized injection mechanism of the utility model;

[0018] Figure 3 It is a principle diagram of the utility model.

[0019] In the figure: 1. storage cabinet; 2. mounting base; 3. electronic drain valve; 4. electronic inlet valve; 5. branch drain pipe; 6. branch inlet pipe; 7. foaming agent pressurized injection mechanism; 8. ball screw; 9. bearing seat; 10. second gear; 11. first gear; 12. reducer; 13. servo motor; 14. ball screw nut; 15. slider; 16. piston rod; 17. piston; 18. cooling jacket; 19. cylinder; 20. pressure sensor; 21. main inlet pipe; 22. main drain pipe; 23. one-way valve; 24. frame; 25. linear guide. DETAILED DESCRIPTION

[0020] The following is a further description of the embodiments of the present invention in conjunction with the accompanying drawings:

[0021] Embodiment 1:

[0022] like Figures 1 to 3 As shown, the carbon dioxide foaming agent injection device of the utility model comprises a main liquid inlet pipe 21, a main liquid discharge pipe 22 and a mounting seat 2, on which two foaming agent pressurized injection mechanisms 7 are installed, and the foaming agent pressurized injection mechanism 7 comprises a frame 24 fixedly connected to the mounting seat 2, on which a linear guide assembly, a bearing seat 9 and a cylinder 19 are fixedly connected, a piston 17 is connected in the cylinder 19, a piston rod 16 is connected at the bottom of the piston 17, and a ball screw 8 is rotatably connected in the bearing seat 9, The ball screw 8 is connected to a ball screw nut 14, and the ball screw nut 14 and the piston rod 16 are connected to the movable parts of the linear guide assembly, and the ball screw 8 is connected to a rotary drive assembly; the main liquid inlet pipe 21 is connected to two branch liquid inlet pipes 6, and the two liquid inlet pipes 6 are connected to an electronic liquid inlet valve 4, and the two liquid inlet pipes 6 are connected to the cylinder 19; the main liquid discharge pipe 22 is connected to two branch liquid discharge pipes 5, and the two liquid discharge pipes 5 are connected to an electronic liquid discharge valve 3, and the two liquid discharge pipes 5 are connected to the cylinder 19.

[0023] When in use, the ball screw 8 is driven to rotate by the rotary drive assembly, and the piston rod 16 can be smoothly driven to move through the ball screw nut 14; low-pressure and variable-quantity liquid carbon dioxide foaming agent enters from the main liquid inlet pipe 21, and when the piston rod 16 on the left moves downward, the cavity of the cylinder barrel 19 on the left increases, and at the same time, the electronic liquid inlet valve 4 on the left is opened, the electronic liquid inlet valve 4 on the right and the electronic liquid discharge valve 3 on the left are both closed, and the liquid carbon dioxide foaming agent in the main liquid inlet pipe 21 enters the cylinder barrel 19 on the left through the branch liquid inlet pipe 6 on the left. When the cylinder barrel 19 on the left is full of liquid carbon dioxide foaming agent, the left piston rod 16 is controlled to move upward by the rotary drive assembly on the left. At this time, the electronic liquid inlet valve 4 on the left is closed, the electronic liquid inlet valve 4 on the right and the electronic liquid discharge valve 3 on the left are both opened, and the electronic liquid discharge valve 3 on the right is closed, and the cavity of the cylinder barrel 19 on the left gradually decreases, and the liquid carbon dioxide in the cylinder barrel 19 on the left is gradually reduced. The carbon dioxide foaming agent is discharged through the branch drain pipe 5 and the main drain pipe 22 on the left. At the same time, the piston rod 16 on the right will move downward to increase the cavity of the cylinder barrel 19 on the right, so that the low-pressure variable-quantity liquid carbon dioxide foaming agent enters the cylinder barrel 19 on the right through the branch inlet pipe 6 on the right. When the cylinder barrel 19 on the right is full of liquid carbon dioxide foaming agent, the piston rod 16 on the right moves upward. At this time, the electronic inlet valve 4 on the right is closed, the electronic inlet valve 4 on the left and the electronic drain valve 3 on the right are both opened, and the electronic drain valve 3 on the left is closed. The cavity of the cylinder barrel 19 on the right gradually decreases, and the liquid carbon dioxide foaming agent in the cylinder barrel 19 on the right is discharged through the branch drain pipe 5 and the main drain pipe 22 on the right. At the same time, the low-pressure variable-quantity liquid carbon dioxide foaming agent enters the cylinder barrel 19 on the left. This cycle converts the variable-quantity low-pressure liquid carbon dioxide foaming agent into a quantitative, high-pressure liquid carbon dioxide foaming agent for output.

[0024] The carbon dioxide foaming agent injection device described in the utility model drives the ball screw 8 to rotate through the rotary drive component, thereby steadily driving the piston rod 16 to move through the ball screw nut 14, and the two piston rods 16 react in the two cylinders 19, and the two suck and discharge in a cycle, and cooperate with the opening and closing of the electronic liquid inlet valve 4 and the electronic liquid discharge valve 3, so as to realize the stable delivery of high-pressure and quantitative carbon dioxide foaming agent, and effectively ensure the molding quality of foam plastics.

[0025] Embodiment 2:

[0026] like Figures 1 to 3 As shown, based on Example 1,

[0027] Furthermore, the linear guide assembly includes a linear guide rail 25 arranged on a frame 24, a slider 15 is slidably connected to the linear guide rail 25, the ball screw nut 14 and the piston rod 16 are fixedly connected to the slider 15, and the directional movement of the ball screw nut 14 and the piston rod 16 is achieved through the cooperation between the slider 15 and the linear guide rail 25, with a simple structure and stable operation;

[0028] Furthermore, the piston rod 16 is a hollow structure, and the upper end of the ball screw 8 is inserted into the center hole of the piston rod 16, so that the upper end of the ball screw 8 does not need to be connected through a bearing, making the structure more compact and simple;

[0029] Furthermore, the rotary drive assembly includes a reducer 12 fixed on the frame 24, the reducer 12 is connected to a servo motor 13, a first gear 11 is connected to the output shaft of the reducer 12, a second gear 10 is mounted on the ball screw 8, and the second gear 10 is meshed with the first gear 11. Since the servo motor 13 and the gear transmission have high precision, the flow rate of the liquid carbon dioxide foaming agent entering the cylinder 19 can be calculated according to the number of revolutions of the servo motor 13, without the need to add an additional flow meter to detect the flow rate;

[0030] Furthermore, a storage cabinet 1 is provided on the mounting seat 2, so that the device has a storage function;

[0031] Furthermore, both the main liquid inlet pipe 21 and the main liquid outlet pipe 22 are provided with a one-way valve 23, which can effectively prevent the liquid carbon dioxide foaming agent from flowing back, thus playing a protective role;

[0032] Furthermore, a cooling jacket 18 is connected to the outer side of the cylinder 19, and the cooling jacket 18 can cool the liquid carbon dioxide foaming agent in the cylinder 19 to effectively prevent the liquid carbon dioxide foaming agent from gasifying;

[0033] Furthermore, a pressure sensor 20 is connected to the cylinder 19 , and the pressure sensor 20 can monitor the pressure in the cylinder 19 in real time.

Claims

1. A carbon dioxide foaming agent injection device, characterized in that: The foaming agent pressurized injection mechanism (7) comprises a main liquid inlet pipe (21), a main liquid outlet pipe (22) and a mounting seat (2). The mounting seat (2) is provided with two foaming agent pressurized injection mechanisms (7). The foaming agent pressurized injection mechanism (7) comprises a frame (24) fixedly connected to the mounting seat (2). A linear guide assembly, a bearing seat (9) and a cylinder (19) are fixedly connected to the frame (24). A piston (17) is connected inside the cylinder (19). The bottom of the piston (17) is connected to a piston rod (16). A ball screw (8) is rotatably connected inside the bearing seat (9). The ball screw (8) is connected to a The ball screw nut (14), the ball screw nut (14) and the piston rod (16) are all connected to the movable part of the linear guide assembly, and the ball screw (8) is connected to the rotary drive assembly; the main liquid inlet pipe (21) is connected to two branch liquid inlet pipes (6), the two liquid inlet pipes (6) are both connected to the electronic liquid inlet valve (4), and the two liquid inlet pipes (6) are both connected to the cylinder barrel (19); the main liquid discharge pipe (22) is connected to two branch liquid discharge pipes (5), the two liquid discharge pipes (5) are both connected to the electronic liquid discharge valve (3), and the two liquid discharge pipes (5) are both connected to the cylinder barrel (19).

2. The carbon dioxide foaming agent injection device according to claim 1, characterized in that: The linear guide assembly comprises a linear guide rail (25) arranged on a frame (24), a slider (15) is slidably connected to the linear guide rail (25), and the ball screw nut (14) and the piston rod (16) are both fixedly connected to the slider (15).

3. The carbon dioxide foaming agent injection device according to claim 1, characterized in that: The piston rod (16) is a hollow structure, and the upper end of the ball screw (8) is inserted into the center hole of the piston rod (16).

4. The carbon dioxide foaming agent injection device according to claim 1, characterized in that: The rotary drive assembly comprises a reducer (12) fixed on a frame (24), the reducer (12) being connected to a servo motor (13), a first gear (11) being connected to an output shaft of the reducer (12), a second gear (10) being mounted on a ball screw (8), and the second gear (10) being meshed with the first gear (11).

5. The carbon dioxide foaming agent injection device according to claim 1, characterized in that: A storage cabinet (1) is provided on the mounting seat (2).

6. The carbon dioxide foaming agent injection device according to claim 1, characterized in that: Both the main liquid inlet pipe (21) and the main liquid outlet pipe (22) are provided with a one-way valve (23).

7. The carbon dioxide foaming agent injection device according to any one of claims 1 to 6, characterized in that: The outer side of the cylinder barrel (19) is connected to a cooling jacket (18).

8. The carbon dioxide foaming agent injection device according to claim 7, characterized in that: The cylinder (19) is connected to a pressure sensor (20).

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