Intercepting nozzle for magnesium alloy slurry control

Abstract

The utility model provides a closure nozzle for magnesium alloy slurry control, which comprises a front machine barrel, a lower nozzle, a piston cover, a runner structure, a plunger valve core and a driving arm, an upper connecting port and a lower connecting port are arranged at the front end of the front machine barrel, the lower nozzle is communicated with the lower connecting port, the piston cover is communicated with the upper connecting port, and the plunger valve core is communicated with the runner structure. The flow channel structure is arranged in the lower nozzle and communicated with the lower connecting port to convey slurry, the plunger valve element is connected in the piston cover in a sliding mode and sequentially penetrates through the upper connecting port and the lower connecting port to be used for blocking an outlet of the lower nozzle, and the driving arm is arranged at the upper end of the injection machine barrel and used for driving the plunger valve element to move. When the metering back pressure is increased to a higher level, a better sealing effect can still be ensured, so that the stability of the raw material density is improved, the situation of slurry countercurrent can be basically avoided when the nozzle is in an open state, and the nozzle is very suitable for the situations of high sealing difficulty and high injection dynamic pressure during preparation of magnesium alloy slurry.

Description

Technical Field

[0001] The utility model belongs to the technical field of metal forming, and in particular relates to a shut-off nozzle for controlling magnesium alloy slurry. Background Art

[0002] Shut-off nozzles are common components in the field of injection molding machines, used to control the outflow and cut-off of raw materials. They are generally composed of cylinders, diverter cones, valve cores and other parts. They can adapt to working conditions below 300 degrees Celsius, can do a certain amount of sealing, and can also avoid small amounts of plastic leakage through high-temperature gasification of polymer materials.

[0003] In the field of magnesium alloy injection molding, a straight nozzle is generally fixed at the front of the barrel. There are two types of nozzles: ball contact nozzles and thermal expansion nozzles, but both have no shut-off function. The slurry will overflow from the nozzle and flow into the mold or machine. This process is generally controlled by a condensation plug. However, this control method has low accuracy and high energy consumption. In addition, it is common for the condensation plug to be loose, resulting in spraying, or the condensation plug to be too solid, resulting in obstruction of normal injection.

[0004] A Chinese invention patent with patent publication number CN115122585A and publication date September 30, 2022, discloses a shut-off nozzle, an injection device, and an injection molding machine with a needle valve, providing a shut-off nozzle with low manufacturing cost and no concerns about needle valve deflection. The invention targets a shut-off nozzle in which a needle valve is coaxially arranged with the injection nozzle in the flow path of the injection nozzle. In the shut-off nozzle, a guide ring is arranged in the flow path of the injection nozzle, and the needle valve has a cylindrical shaft portion, and the guide ring guides the needle valve on the shaft portion.

[0005] The shutoff nozzle with a needle valve in this Chinese invention patent has the following general usage and advantages: it can suppress the increase in the cost required for machining the shutoff nozzle and suppress the deflection of the needle valve.

[0006] However, the shut-off nozzle with a needle valve has at least the following shortcomings during actual use. In other words, these are the technical problems to be solved by the present invention: although the shut-off nozzle has the advantages of shut-off and long service life compared to the straight-through nozzle, its shut-off method still has the problem of insufficient sealing, which is more likely to cause slurry leakage due to poor shut-off effect under non-injection conditions. In addition, the fluidity and injection dynamic pressure of magnesium alloy slurry are stronger than those of ordinary slurry, and the sealing requirements are higher. Therefore, this nozzle is not suitable for the preparation of magnesium alloy slurry.

[0007] Therefore, in summary, there is an urgent need for a shut-off nozzle with better shut-off effect, stronger sealing effect and more suitable for magnesium alloy melt working conditions to solve such problems. Utility Model Content

[0008] The utility model provides a shut-off nozzle for controlling magnesium alloy slurry, comprising a front barrel, a lower nozzle, a piston cover, a flow channel structure, a plunger valve core and a driving arm, wherein the front barrel is arranged at the front end of an injection barrel, and an upper connecting port and a lower connecting port are provided at the front end of the front barrel, the lower nozzle is arranged at the lower end of the front end of the front barrel and is connected with the lower connecting port, the piston cover is arranged at the upper end of the front end of the front barrel and is connected with the upper connecting port, the flow channel structure is arranged in the lower nozzle and is connected with the lower connecting port to convey the slurry, the plunger valve core is slidably connected in the piston cover, and passes through the upper connecting port and the lower connecting port in sequence to seal the outlet of the lower nozzle, the driving arm is arranged at the upper end of the injection barrel and is used to drive the plunger valve core to move, so that: the utility model has a good shut-off effect, can still ensure a better sealing effect when the metering back pressure is increased to a higher level, thereby improving the stability of the raw material density, and in the open state of the nozzle, can basically prevent the slurry from backflowing, and is very suitable for situations such as magnesium alloy slurry where sealing is difficult and injection dynamic pressure is high during preparation.

[0009] The technical solution adopted by the present invention to solve the above-mentioned problem is: a shut-off nozzle for controlling magnesium alloy slurry, comprising: a front barrel, which is arranged at the front end of an injection barrel, and an upper connecting port and a lower connecting port are provided at the front end of the front barrel; a lower nozzle, which is arranged at the front end of the front barrel, and the lower end of the lower nozzle has a reduced diameter end; a piston cover, which is arranged at the upper end of the front barrel and connected to the upper connecting port; a flow channel structure, which is arranged in the lower nozzle and transports the slurry by being connected to the lower connecting port; a plunger valve core, which is slidably connected in the piston cover and passes through the upper connecting port and the lower connecting port in sequence to seal the reduced diameter end; a driving arm, which is arranged at the upper end of the injection barrel and is used to drive the plunger valve core to move.

[0010] A further preferred technical solution is that: the piston cover includes a shell, an upper channel arranged in the shell and connected to the upper connecting port, and a first annular protrusion arranged on the upper channel away from the upper connecting port; the plunger valve core includes a main body section for passing through the upper connecting port and the lower connecting port to seal the reduced diameter opening, an upper connecting section arranged at the upper end of the main body section and slidingly connected to the upper channel, and a first annular limiting portion arranged on the circumferential side of the upper connecting section and matching the first annular protrusion.

[0011] A further preferred technical solution is that: the plunger valve core also includes a second annular limiting portion arranged on the circumferential side of the upper connecting section and located at the lower end of the first annular limiting portion; a second annular protrusion matching the second annular limiting portion is provided at the connection between the upper connecting port and the upper channel.

[0012] A further preferred technical solution is that: the lower end of the first annular protrusion has a first inclined surface, and the upper end of the first annular limiting portion has a second inclined surface matching the first inclined surface.

[0013] A further preferred technical solution is that the upper end of the second annular protrusion has a third inclined surface, and the lower end of the second annular limiting portion has a fourth inclined surface matching the third inclined surface.

[0014] A further preferred technical solution is that the plunger valve core further includes a sealing ring provided on the circumferential side of the upper connecting section and located between the first annular limiting portion and the second annular limiting portion.

[0015] A further preferred technical solution is that: a heating chamber is provided inside the plunger valve core, and a heating rod is provided in the heating chamber.

[0016] A further preferred technical solution is that the driving arm includes a base arranged at the upper end of the injection barrel, and a cylinder arranged on the base and connected to the upper connecting section.

[0017] A further preferred technical solution is that: the driving arm also includes a crank arm arranged at the output end of the cylinder, and a connecting groove arranged at the upper end of the upper connecting section; the crank arm is hinged to the base at the corner, and the end of the crank arm away from the cylinder has a connecting block connected to the connecting groove.

[0018] A further preferred technical solution is that a heat insulating pad is provided between the base and the injection barrel. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the present utility model;

[0020] Figure 2 It is a left view of the utility model;

[0021] Figure 3 It is a front cross-sectional view of the utility model;

[0022] Figure 4 It is a partial cross-sectional view of the left side of the utility model;

[0023] Figure 5 It is a front view of the utility model.

[0024] In the figures, the meanings of the reference numerals are as follows:

[0025] Injection barrel a;

[0026] Front barrel 1, lower nozzle 2, piston cover 3, flow channel structure 4, plunger valve core 5, drive arm 6;

[0027] Upper connecting port 11, lower connecting port 12, reduced diameter opening 21, shell 31, upper channel 32, first annular protrusion 33, second annular protrusion 34, first inclined surface 35, third inclined surface 36, main body section 51, upper connecting section 52, first annular limiting portion 53, second annular limiting portion 54, second inclined surface 55, fourth inclined surface 56, sealing ring 57, heating chamber 58, heating rod 59, base 61, oil cylinder 62, curved arm 63, connecting groove 64, connecting block 65, thermal insulation pad 66. DETAILED DESCRIPTION

[0028] The following describes the embodiments of the present invention in detail with reference to the accompanying drawings. The following descriptions are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention.

[0029] The directional terms such as up, down, left, right, front, back, front, back, top, bottom, etc. mentioned or may be mentioned in this specification are defined relative to the structures shown in the drawings. The words "inside" and "outside" refer to the directions toward or away from the geometric center of a specific component, respectively. They are relative concepts and may therefore change accordingly according to their different positions and different usage states. Therefore, these or other directional terms should not be interpreted as restrictive terms.

[0030] Example 1

[0031] As attached Figures 1 to 5 As shown, a shut-off nozzle for controlling magnesium alloy slurry is characterized in that it includes: a front barrel 1, which is arranged at the front end of the injection barrel a, and the front end of the front barrel 1 is provided with an upper connecting port 11 and a lower connecting port 12; a lower nozzle 2, which is arranged at the front end of the front barrel 1, and the lower end of the lower nozzle 2 has a reduced diameter opening 21; a piston cover 3, which is arranged at the upper end of the front barrel 1 and connected to the upper connecting port 11; a flow channel structure 4, which is arranged in the lower nozzle 2 and transports the slurry by being connected to the lower connecting port 12; a plunger valve core 5, which is slidably connected in the piston cover 3, and passes through the upper connecting port 11 and the lower connecting port 12 in sequence to seal the reduced diameter opening 21; a driving arm 6, which is arranged at the upper end of the injection barrel a and is used to drive the plunger valve core 5 to move.

[0032] In this embodiment, the shut-off nozzle for controlling magnesium alloy slurry is generally used as follows:

[0033] Semi-solid magnesium alloy slurry is different from ordinary plastic slurry. It needs to be prepared at a high temperature of 650°. Therefore, the shut-off nozzle is preferably made of high-temperature resistant and corrosion-resistant steel. The injection flow channel in the injection barrel is extended by installing the front barrel 1 at the front end of the injection barrel a, and the lower nozzle 2 is installed at the lower end of the front barrel 1 to form a flow channel structure 4 extending forward from the injection flow channel and turning downward to the outlet of the lower nozzle through the lower connecting port 12. The lower half of the flow channel structure 4 is preferably a vertically arranged longitudinal flow channel with an angle of not less than 20°. The piston cover 3 is installed at the upper end of the front barrel 1 and communicates with the flow channel structure 4 through the upper connecting port 11. The plunger valve core 5 passes through the piston cover 3 and moves back and forth in the flow channel structure 4 under the drive of the driving arm 6 to open / close the outlet of the lower nozzle. A reducing opening 21 that matches the size of the lower end of the plunger valve core 5 is provided at the outlet. The inner diameter of the reducing opening 21 gradually decreases to be smaller than the outer diameter of the lower end of the plunger valve core. The front barrel 1, the lower nozzle 2, and the piston cover 3 are all installed by bolts; when injection is required, the driving arm 6 drives the plunger valve core 5 to lift up and open the outlet of the lower nozzle. When the injection is completed, the driving arm 6 drives the plunger valve core 5 downward again to block the outlet of the lower nozzle to close the structure to prevent slurry leakage or air from entering.

[0034] As a preferred embodiment of this embodiment, the piston cover 3 includes a shell 31, an upper channel 32 arranged in the shell 31 and connected to the upper connecting port 11, a first annular protrusion 33 arranged on the upper channel 32 away from the upper connecting port 11, and a second annular protrusion 34 matching the second annular limiting portion 54 is provided at the connection between the upper connecting port 11 and the upper channel 32; the plunger valve core 5 includes a main body section 51 for passing through the upper connecting port 11 and the lower connecting port 12 to seal the reduced diameter closing end 21, an upper connecting section 52 arranged at the upper end of the main body section 51 and slidingly connected to the upper channel 32, a first annular limiting portion 53 arranged on the peripheral side of the upper connecting section 52 and matching the first annular protrusion 33, and a second annular limiting portion 54 arranged on the peripheral side of the upper connecting section 52 and located at the lower end of the first annular limiting portion 53.

[0035] In this embodiment, the upper channel 32 is arranged through the shell 31 and is used to pass through the upper connecting section 52 of the plunger valve core. A first annular protrusion 33 is provided at the upper end of the upper channel 32, and a second annular protrusion 34 is provided at the lower end connected to the upper connecting port 11. At the same time, the part of the upper connecting section 52 located in the upper channel 32 is provided with a first annular limiting portion 53 and a second annular limiting portion 54. The two annular protrusions cooperate with the two annular limiting portions to limit the range of movement of the plunger valve core 5, thereby preventing excessive movement of the plunger valve core from damaging the device and further enhancing the sealing performance of the structure. During injection, the plunger valve core rises so that the first annular limiting portion 53 and the first annular protrusion 33 are stopped, thereby preventing the slurry from overflowing from the upper channel 32 or air from entering the flow channel structure 4 during the injection process and causing an impact. When the injection is stopped, the plunger valve core descends so that the lower end of the second annular limiting portion 54 is stopped against the second annular protrusion 34, thereby intercepting the slurry and completing the sealing of the flow channel structure 4.

[0036] As a preferred embodiment of this embodiment, the lower end of the first annular protrusion 33 has a first inclined surface 35, and the upper end of the first annular limiting portion 53 has a second inclined surface 55 matching the first inclined surface 35; the upper end of the second annular protrusion 34 has a third inclined surface 36, and the lower end of the second annular limiting portion 54 has a fourth inclined surface 56 matching the third inclined surface 36.

[0037] In this embodiment, in order to further improve the sealing performance of the shut-off nozzle, the first bevel 35 is matched with the second bevel 55, and the third bevel 36 is matched with the fourth bevel 56. The bevel sealing between the two makes the pressure more evenly distributed, reduces the possibility of leakage, and provides a better sealing effect.

[0038] As a preference of this embodiment, the plunger valve core 5 further includes a sealing ring 57 provided on the circumference of the upper connecting section 52 and located between the first annular limiting portion 53 and the second annular limiting portion 54 .

[0039] In this embodiment, the sealing ring 57 is arranged between the first annular limit portion 53 and the second annular limit portion 54 to enhance the sealing of the flow channel structure during the up and down movement of the plunger valve core, and solves the leakage problem that may be caused when the first annular limit portion 53 and the second annular limit portion 54 are not stopped against the first annular protrusion 33 and the second annular protrusion 34. On the other hand, the sealing ring 57 is fixedly connected to the upper connecting section 52, and can scrape off magnesium materials such as magnesium oxide and magnesium nitride formed by the leakage of slurry in the upper channel during the movement to avoid their long-term residual clogging of the gaps between various components. Multiple sealing rings can be provided.

[0040] As a preferred embodiment of this embodiment, a heating chamber 58 is provided inside the plunger valve core 5 , and a heating rod 59 is provided in the heating chamber 58 .

[0041] In this embodiment, the heating chamber 58 preferably extends to the upper end of the plunger valve core 5 and is connected to the outside world, so as to facilitate timely replacement and repair of the heating rod 59 inside it. A sealing plug is provided at the upper end of the heating chamber 58, and the heating rod transfers heat to the flow channel structure to prevent the temperature in the nozzle from decreasing and affecting the injection effect.

[0042] As a preferred embodiment of this embodiment, the driving arm 6 includes a base 61 arranged at the upper end of the injection barrel a, an oil cylinder 62 arranged on the base 61 and connected to the upper connecting section 52, and an insulation pad 66 is arranged between the base 61 and the injection barrel a.

[0043] In this embodiment, the base 61 is installed on the upper end of the injection barrel a by bolts, and is provided with a heat insulation pad 66 to isolate the temperature influence of the injection barrel on the one hand, and on the other hand to dampen the structure of the driving arm 6 and reduce the vibration influence on the injection barrel. The heat insulation pad 66 can be set to high-temperature resistant foamed silicone, etc. The cylinder 62 is set on the base 61. Preferably, the cylinder 62 extends to the top of the plunger valve core and drives the movement of the plunger valve core through telescoping, thereby reducing the wear on the upper channel and the flow channel structure caused by the active angle.

[0044] The above-mentioned oil cylinder is a technical content well known to those skilled in the art and will not be described in detail in this embodiment.

[0045] As a preferred embodiment of this embodiment, the driving arm 6 also includes a curved arm 63 arranged at the output end of the cylinder 62, and a connecting groove 64 arranged at the upper end of the upper connecting section 52; the curved arm 63 is hinged to the base 61 at the corner, and the end of the curved arm 63 away from the cylinder 62 has a connecting block 65 connected to the connecting groove 64.

[0046] In this embodiment, since the oil cylinder 62 is located directly above the plunger valve core, which will cause the center of gravity to tilt and cause instability, the oil cylinder is set on the base, and a curved arm 63 is hinged to the base 61. The upper end of the curved arm 63 is hinged to the output end of the oil cylinder 62, and the lower end is movably connected to the connecting groove 64 at the upper end of the upper connecting section 52. The connecting block 65 is rotated in the connecting groove 64 to drive the plunger valve core to move up and down. The inner diameter of the connecting groove 64 is slightly larger than the outer diameter of the connecting block 65, and the contact surface between the connecting block 65 and the connecting groove 64 is preferably a curved surface.

[0047] Compared with the existing technology, the technical solution described in the present application has the following advantages: a diverting flow channel structure is set up by utilizing factors such as gravity to effectively prevent the slurry from flowing back, and the plunger valve core set in conjunction with the flow channel structure can improve the accuracy of slurry flow control in the nozzle. Furthermore, multiple sets of sealing structures improve the sealing performance of the shut-off nozzle and can withstand higher pressure, making it more suitable for the preparation of magnesium alloy slurry.

[0048] While the embodiments of the present invention have been described in detail above with reference to the accompanying drawings, the present invention is not limited to the embodiments described above. Various modifications are possible within the scope of knowledge possessed by a person skilled in the art without departing from the spirit of the present invention. These modifications are non-inventive and are protected by patent law as long as they fall within the scope of the claims of the present invention.

Claims

1. A shut-off nozzle for controlling magnesium alloy slurry, characterized by: include: A front barrel (1), the front barrel (1) being arranged at the front end of the injection barrel (a), and the front end of the front barrel (1) being provided with an upper connecting port (11) and a lower connecting port (12); A lower nozzle (2), the lower nozzle (2) being arranged at the front end of the front barrel (1), and the lower end of the lower nozzle (2) having a reduced diameter end (21); A piston cover (3) is arranged at the upper end of the front barrel (1) and connected to the upper connecting port (11); a flow channel structure (4), disposed in the lower nozzle (2) and conveying slurry by being connected to the lower connecting port (12); A plunger valve core (5) is slidably connected in the piston cover (3) and sequentially passes through the upper connecting port (11) and the lower connecting port (12) to seal the reduced diameter port (21); A driving arm (6) is provided at the upper end of the injection barrel (a) and is used to drive the plunger valve core (5) to move.

2. The shut-off nozzle for controlling magnesium alloy slurry according to claim 1, characterized in that: The piston cover (3) comprises a housing (31), an upper channel (32) arranged in the housing (31) and connected to the upper connecting port (11), and a first annular protrusion (33) arranged on the upper channel (32) away from the upper connecting port (11); the plunger valve core (5) comprises a main body section (51) for passing through the upper connecting port (11) and the lower connecting port (12) to seal the reduced diameter end (21), an upper connecting section (52) arranged at the upper end of the main body section (51) and slidably connected to the upper channel (32), and a first annular limiting portion (53) arranged on the circumference of the upper connecting section (52) and matching the first annular protrusion (33).

3. The shut-off nozzle for controlling magnesium alloy slurry according to claim 2, characterized in that: The plunger valve core (5) further comprises a second annular limiting portion (54) provided on the circumferential side of the upper connecting section (52) and located at the lower end of the first annular limiting portion (53); a second annular protrusion (34) matching the second annular limiting portion (54) is provided at the connection between the upper connecting port (11) and the upper channel (32).

4. The shut-off nozzle for controlling magnesium alloy slurry according to claim 2, characterized in that: The lower end of the first annular protrusion (33) has a first inclined surface (35), and the upper end of the first annular limiting portion (53) has a second inclined surface (55) matching the first inclined surface (35).

5. The shut-off nozzle for controlling magnesium alloy slurry according to claim 3, characterized in that: The upper end of the second annular protrusion (34) has a third inclined surface (36), and the lower end of the second annular limiting portion (54) has a fourth inclined surface (56) matching the third inclined surface (36).

6. The shut-off nozzle for controlling magnesium alloy slurry according to claim 3, characterized in that: The plunger valve core (5) further comprises a sealing ring (57) arranged on the circumferential side of the upper connecting section (52) and located between the first annular limiting portion (53) and the second annular limiting portion (54).

7. The shut-off nozzle for controlling magnesium alloy slurry according to claim 1, characterized in that: The plunger valve core (5) has a heating chamber (58) inside, and a heating rod (59) is provided in the heating chamber (58).

8. The shut-off nozzle for controlling magnesium alloy slurry according to claim 2, characterized in that: The driving arm (6) comprises a base (61) arranged at the upper end of the injection barrel (a), and an oil cylinder (62) arranged on the base (61) and connected to the upper connecting section (52).

9. The shut-off nozzle for controlling magnesium alloy slurry according to claim 8, characterized in that: The driving arm (6) further comprises a crank arm (63) arranged at the output end of the oil cylinder (62), and a connecting groove (64) arranged at the upper end of the upper connecting section (52); the crank arm (63) is hinged to the base (61) at a corner, and the end of the crank arm (63) away from the oil cylinder (62) has a connecting block (65) connected to the connecting groove (64).

10. The shut-off nozzle for controlling magnesium alloy slurry according to claim 8, characterized in that: A heat insulating pad (66) is provided between the base (61) and the injection barrel (a).

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