Extrusion device for quantitative mold

Abstract

The utility model discloses an extrusion device for a quantitative mold, a quantitative cavity is arranged in the quantitative mold, the extrusion device is positioned in the quantitative cavity and can slide up and down, the extrusion device is characterized by comprising a shell, an air passage is arranged in the shell, the upper end of the air passage is provided with an air outlet positioned at the bottom of the quantitative cavity, and the lower end of the air passage is provided with an air outlet positioned at the bottom of the quantitative cavity. And a valve needle for blocking the air outlet is arranged in the air passage. In the embodiment, high-pressure air enters the air channel to push the valve needle to move upwards, so that an air outlet gap is formed between the conical head and the inner wall of the air outlet of the air channel, and the high-pressure air is blown out from the gap, so that adhesion of raw materials is avoided, and quantitative and accurate material taking is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of product packaging, in particular to an extrusion device for a quantitative mold. Background Art

[0002] The quantitative extrusion equipment is composed of an extruder 9 and a quantitative die 10. Figure 1 During operation, the extruder 9 injects the raw material 8 into the quantitative cavity 11 of the quantitative mold 10 according to the preset weight. After being filled, the quantitative mold 10 swings upward 90°, and the piston head in the quantitative mold 10 pushes the raw material 8 outward. At the same time, the material suction cup 7 descends to suck the raw material 8 and sucks it away. However, when the raw material 8 is a highly viscous solid raw material, the bonding force between the raw material 8 and the piston head is very large, which results in the material suction cup 7 not being able to suck away all the raw material 8 every time. The raw material 8 remaining on the piston head will be squeezed in the next action cycle, and the raw material 8 will overflow from all sides of the quantitative cavity 11, causing pollution and inaccurate material quantification. Utility Model Content

[0003] The utility model aims to provide an extrusion device for a quantitative mold. The structure can push out the raw materials injected into the quantitative mold and then suck them all away.

[0004] The purpose of the utility model can be achieved through the following technical solutions:

[0005] An extrusion device for a quantitative mold, the quantitative mold has a quantitative cavity inside, the extrusion device is located in the quantitative cavity and can slide up and down, the extrusion device includes a shell, the shell has an airway, the upper end of the airway has an outlet located at the bottom of the quantitative cavity, the airway is provided with a valve needle for blocking the outlet, and the valve needle is driven by gas when gas is passed into the airway to form an outlet gap with the inner wall of the outlet.

[0006] By adopting the above technical solution, when the metering chamber is filled with raw materials and the extrusion device pushes the raw materials out of the upper port of the air duct, the valve needle is pushed upward when the high-pressure gas enters the air duct, so that an air outlet gap is generated between the head of the valve needle and the inner wall of the air outlet of the air duct. The high-pressure gas is blown out from the gap and blown towards the raw materials, thereby preventing the raw materials from adhering to the metering chamber and the shell, ensuring accurate material quantitative extraction.

[0007] As a further solution of the utility model: the air outlet of the air channel is a conical opening, and the valve needle has a conical head located in the air outlet and matched with the air outlet.

[0008] As a further solution of the utility model: when the conical head blocks the air outlet, the front end surface of the conical head is flush with the front end surface of the shell.

[0009] As a further solution of the utility model: the airway also includes a vertical portion connected to the lower side of the air outlet, and the valve needle also includes a rod portion extending downward from the bottom surface of the conical head to the vertical portion of the airway, and an air passage for gas to pass through is opened on the upper part of the rod portion.

[0010] As a further solution of the utility model, it also includes a limiting structure to prevent the valve needle from leaving the air passage. With the above technical solution, the moving distance of the valve needle is limited to a certain extent by the limiting structure when it is pushed by high-pressure gas, which can prevent the valve needle from leaving the air passage.

[0011] As a further solution of the utility model: the limiting structure includes a pin penetrating the lower end of the valve needle rod and a waist groove on the inner wall of the vertical part of the airway that matches the pin, wherein the vertical part has a moving space for the pin to move up and down. With the above technical solution, the waist groove can prevent the valve needle from rotating.

[0012] As a further solution of the utility model: a reset mechanism capable of resetting the valve needle is provided in the airway.

[0013] As a further solution of the utility model: the reset mechanism includes a spring and a gasket which are sequentially sleeved on the rod of the valve needle from top to bottom, the gasket is located above the pin, and a stop step is provided in the vertical portion of the airway. The upper end of the spring abuts against the rear end surface of the stop step, and the lower end abuts against the gasket. The vertical portion has a moving space for the gasket to move up and down.

[0014] As a further solution of the utility model: an air nozzle communicated with the airway is provided on the lower end of the shell.

[0015] As a further solution of the utility model: the number of the quantitative cavities is two, the number of the extrusion devices is two, and they are respectively arranged in the corresponding quantitative cavities.

[0016] The beneficial effects of the utility model are as follows: after the raw materials in the quantitative chamber are pushed out, the air nozzle is ventilated, and high-pressure air enters the airway to push the valve needle upward, so that an air outlet gap is generated between the cone head and the inner wall of the air outlet of the airway, and the high-pressure air is blown out from the gap and blown toward the raw materials, thereby avoiding the adhesion of the raw materials, ensuring the accurate quantitative measurement of materials, improving production efficiency, and reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The utility model is further described below in conjunction with the accompanying drawings.

[0018] Figure 1 It is a structural schematic diagram of the quantitative extrusion equipment of the utility model;

[0019] Figure 2 It is a structural schematic diagram of the quantitative mold of the utility model;

[0020] Figure 3 It is a cross-sectional view of the quantitative mold of the utility model;

[0021] Figure 4 The raw material is shown to be injected into the quantitative cavity of the quantitative mold;

[0022] Figure 5 It shows that after the raw material is pushed out of the quantitative cavity by the extrusion device, the high-pressure gas pushes the valve needle upward, and a gas outlet gap is generated between the cone head and the inner wall of the gas outlet, and the high-pressure gas is blown out from the gap and blown toward the raw material. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] See also Figure 1 , Figure 2 and Figure 3 As shown, the utility model is an extrusion device for a quantitative mold, and the quantitative mold 10 has a quantitative cavity 11 inside. The extrusion device is located in the quantitative cavity 11 and can slide up and down. The extrusion device includes a shell 20. The shell 20 has an air channel 21, and the upper end of the air channel 21 has an air outlet 211 located at the bottom of the quantitative cavity. A screw plug 22 is assembled at the lower end of the air channel 21. The air outlet 211 is a conical port. The air channel 21 is divided into an air outlet 211 and a vertical portion from top to bottom. The vertical portion is a first section 212, a second section 213 and a third section 214. The diameter of the second section 213 is larger than the diameter of the first section 212, so that a stop step is formed at the junction of the second section 213 and the first section 212.

[0025] like Figure 3 As shown, a valve needle 24 for blocking the air outlet 211 of the air channel is provided in the air channel 21. In this embodiment, the valve needle 24 has a cone head 241 located at the air outlet 211 of the air channel 21, and a rod 242 extending downward from the bottom surface of the cone head 241 to the third section 214 of the air channel 21. The cone head 241 of the valve needle 24 is matched with the air outlet 211 of the air channel 21. The rod 242 of the valve needle 24 is matched with the vertical part of the air channel 21. An air passage 243 for high-pressure gas to pass through is opened on the upper part of the circumference of the rod 242. When the cone head blocks the air outlet, the front end surface of the cone head 241 is flush with the front end surface of the shell.

[0026] like Figure 2 As shown, an air nozzle 25 communicating with the air passage 21 is provided on the lower end of the shell 20 .

[0027] Combination Figure 4 and Figure 5 As shown, in this way, when the metering chamber 11 is filled with the raw material 8, the pushing cylinder (not shown in the figure) drives the extrusion device to push the raw material 8 out of the upper port of the air channel 21. At the same time, the air nozzle 25 is ventilated, and the high-pressure air enters the air channel 21 to push the valve needle 24 upward, so that the cone head 241 and the inner wall of the air outlet 211 form an air outlet gap, and the high-pressure air is blown out through the gap and blown toward the raw material, thereby preventing the raw material 8 from adhering to the metering chamber 11 and the shell 20.

[0028] like Figure 3 As shown, it also includes a limiting structure 26 for limiting the moving distance of the valve needle 24. In this embodiment, the limiting structure 26 includes a pin 262 that penetrates the lower end of the rod 242 of the valve needle 24 and a waist groove 261 located on the inner wall of the third section 214 of the airway and matched with the pin 262. There is a moving space in the third section 214 of the airway for the pin to move up and down. In this way, through the limiting structure 26, when the valve needle 24 is pushed upward by the high-pressure gas, the waist groove 261 can limit the moving distance of the valve needle and prevent the valve needle from leaving the airway 21. At the same time, the waist groove 261 can also prevent the valve needle from rotating.

[0029] Considering that if the valve needle 24 is always extended upward and the upper end of the air channel 21 is always open, when the raw material is injected into the quantitative chamber 11, it will penetrate into the gap between the valve needle 24 and the air channel 21 from the air outlet, making the quantitative material extraction inaccurate. In addition, there is no explosive force when the high-pressure gas is blown to the raw material, and the explosive force is generated at the moment when the valve needle 24 is pushed out. Since the raw material is highly viscous, the raw material stuck to the shell cannot be completely separated without this explosive force.

[0030] like Figure 3 As shown, a reset mechanism 27 is provided in the air passage 21. In this embodiment, the reset mechanism 27 includes a spring 272 and a gasket 271 which are sequentially sleeved on the rod 242 of the valve needle 24 from top to bottom. The gasket 271 is located in the third section 214 of the air passage 21 and above the pin 262. The spring 272 is located in the second section 213 of the air passage 21, with the upper end abutting against the rear end surface of the stop step and the lower end abutting against the gasket 271. Among them, there is a moving space in the third section 214 of the air passage 21 that allows the gasket 271 to move up and down. It should be noted here that the pressure of the high-pressure gas is sufficient to overcome the elastic force of the spring 272. When the high-pressure gas pushes the valve needle 24, the pin 262 moves up with the valve needle 24, and the gasket 271 is pushed up by the high-pressure gas and the pin 262. The spring 272 is compressed and deformed by force, and the spring 272 begins to store energy. When the raw material is taken away, the air nozzle 25 is cut off, and the spring 272 starts to release energy, giving the gasket 271 a downward force, pushing the pin 262 downward, and driving the valve needle 24 to move down and return to the initial position for the next action cycle.

[0031] In this embodiment, the quantitative mold 10 has two quantitative cavities 11 and two extrusion devices, which are respectively disposed in the corresponding quantitative cavities 11 .

[0032] like Figure 1 , Figure 4 and Figure 5 As shown, during operation, the extruder 9 injects the raw material 8 into the quantitative cavity 11 of the quantitative mold 10 according to the preset weight. After being filled, the quantitative mold 10 is driven away from the extruder 9 and swings upward to 90°. At this time, the upper end of the quantitative cavity 11 is aligned with the material suction cup 7. Subsequently, the material suction cup 7 descends to absorb the raw material, and at the same time, the push cylinder drives the extrusion device to push the raw material upward out of the upper end of the quantitative cavity 11. When the raw material is completely pushed out of the upper end of the quantitative cavity 11, the air nozzle 25 is ventilated, and the high-pressure air enters the air channel 21 to push the valve needle 24 upward, so that an air outlet gap is generated between the cone head 241 and the inner wall of the air outlet 211, and the high-pressure air is blown out from the gap and blown toward the raw material, so that the raw material is separated from the shell 20, thereby ensuring that the material suction cup 7 can suck away all the raw materials. When the high pressure gas pushes the valve needle 24, the pin 262 moves upward along with the valve needle 24, and the gasket 271 is pushed upward by the high pressure gas and the pin 262. The spring 272 is compressed and deformed, and the spring 272 starts to store energy. When the raw material is taken away, the gas nozzle 25 is cut off, and the spring 272 starts to release energy, giving the gasket 271 a downward force, pushing the pin 262 downward, and driving the valve needle 24 to move down and back to the initial position for the next action cycle.

[0033] To sum up, after the raw material in the quantitative chamber is pushed out of the quantitative chamber, air is ventilated through the air nozzle, and high-pressure air enters the airway to push the valve needle upward, so that an air outlet gap is generated between the cone head and the inner wall of the air outlet of the airway, and high pressure is blown out from the gap and blown toward the raw material, thereby avoiding the adhesion of the raw material, ensuring the accurate quantitative measurement of the material, improving production efficiency and reducing production costs.

[0034] The above is a detailed description of an embodiment of the utility model, but the content is only a preferred embodiment of the utility model and cannot be considered to limit the scope of implementation of the utility model. All equivalent changes and improvements made within the scope of application of the utility model should still fall within the scope of the patent coverage of the utility model.

Claims

1. An extrusion device for a quantitative mold, wherein the quantitative mold has a quantitative cavity inside, and the extrusion device is located in the quantitative cavity and can slide up and down, characterized in that: The extrusion device includes a shell having an air channel inside the shell. The upper end of the air channel has an air outlet located at the bottom of the quantitative cavity. A valve needle is provided in the air channel to block the air outlet. When gas is introduced into the air channel, the valve needle is driven by gas to form an air outlet gap with the inner wall of the air outlet.

2. The extrusion device for quantitative mold according to claim 1, characterized in that: The air outlet of the air channel is a conical opening, and the valve needle has a conical head located in the air outlet and matched with the air outlet.

3. The extrusion device for quantitative mold according to claim 2, characterized in that: The conical head blocks the air outlet, and the front end surface of the conical head is flush with the front end surface of the shell.

4. The extrusion device for quantitative mold according to claim 3, characterized in that: The airway also includes a vertical portion connected to the lower side of the air outlet, and the valve needle also includes a rod portion extending downward from the bottom surface of the conical head to the vertical portion of the airway, and an airway for gas to pass through is opened on the upper part of the rod portion.

5. The quantitative die extrusion device according to claim 4, characterized in that: It also includes a limiting structure for preventing the valve needle from being separated from the air passage.

6. The quantitative die extrusion device according to claim 5, characterized in that: The limiting structure includes a pin penetrating the lower end of the valve needle rod and a waist groove located on the inner wall of the vertical part of the airway and matched with the pin, wherein the vertical part has a moving space for the pin to move up and down.

7. The extrusion device for quantitative mold according to claim 1, characterized in that: A resetting mechanism capable of resetting the valve needle is arranged in the air passage.

8. The extrusion device for quantitative mold according to claim 7, characterized in that: The reset mechanism includes a spring and a gasket which are sequentially sleeved on the stem of the valve needle from top to bottom. The gasket is located above the pin. A stop step is provided in the vertical portion of the airway. The upper end of the spring abuts against the rear end surface of the stop step, and the lower end abuts against the gasket. The vertical portion has a moving space for the gasket to move up and down.

9. The quantitative die extrusion device according to claim 1, characterized in that: An air nozzle communicated with the airway is arranged on the lower end of the shell.

10. The extrusion device for quantitative mold according to claim 1, characterized in that: The number of the quantitative cavities is two, and the number of the extrusion devices is two, which are respectively arranged in the corresponding quantitative cavities.

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