Needle valve double-cylinder structure

Abstract

The utility model relates to the field of needle valve type hot runners, and discloses a needle valve double-cylinder structure which comprises a shell, an electromagnetic valve, a main nozzle, a splitter plate, a hot nozzle dragging position and a junction box, the electromagnetic valve is fixedly connected to the upper surface of the shell, the main nozzle is fixedly connected to the front surface of the shell, the splitter plate is fixedly connected to the middle of the inner surface of the shell, and the hot nozzle dragging position is fixedly connected to the junction box. The upper portion and the lower portion of the splitter plate are each fixedly connected with a set of hot nozzle dragging positions. According to the automatic fastening butt joint device, through the arrangement of the connecting shaft, the connecting frame, the transmission wheel, the motor, the driving wheel, the driven wheel, the rotating shaft, the ring block and the sleeve rod, after a connecting piece and the automatic fastening butt joint device are in butt joint, the sleeve rod is driven by the motor to start to rotate, and the bolt is driven to rotate under the condition that the sleeve rod sleeves the inside hexagonal bolt, so that automatic fastening butt joint is completed; and a motor rotation program is synchronously started and stopped, so that the connection tightness of each connection point of the device and the feeding device can be ensured to be the same, and the risk of leakage at the interface is reduced.

Description

Technical Field

[0001] This utility model relates to the field of needle valve hot runners, and more particularly to a needle valve double cylinder structure. Background Technology

[0002] Needle valve hot runner systems are a key type of hot runner system in injection molds. They precisely control the flow of molten plastic by incorporating movable needle valves inside the hot nozzle. During injection, when the injection machine is not in operation, the needle valve is closed by spring force or a cylinder-driven mechanism, preventing molten plastic from flowing out and avoiding problems such as stringing and drooling. When the injection machine begins injection, pressure or other control signals activate the drive mechanism to open the needle valve, allowing molten plastic to flow from the hot nozzle into the mold cavity. Because it can precisely control the entry and exit of molten plastic at the gate, it effectively improves the appearance quality of plastic products, reduces waste, and enables sequential injection molding with multiple gates. It is widely used in the production of plastic products with high requirements for appearance and quality, such as automotive parts, appliance housings, and precision electronic components.

[0003] In existing technologies, needle valve type hot runner equipment requires a feed end to be connected at the front end, and the connection is fastened with connectors to ensure the sealing of the raw materials during transmission.

[0004] However, in the actual process of connecting the needle valve hot runner to the feeding device, bolts and connectors are required. The bolts need to be continuously twisted by the operator with the corresponding tools to ensure the tightness of the connection between the two. Therefore, the connection process is time-consuming and laborious. Moreover, different bolts have different twisting angles, so there is a risk of leakage at the connection under the feeding pressure. To solve the above problems, a needle valve double cylinder structure is proposed. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a needle valve double cylinder structure, which aims to improve the problem that in the existing technology, when connecting the needle valve hot runner to the feeding device, bolts and connectors are required. The bolts require the operator to use corresponding tools to continuously twist them to ensure the tightness of the connection between the two, which makes the connection process time-consuming and labor-intensive.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a needle valve double cylinder structure, comprising a housing, a solenoid valve, a main nozzle, a flow divider, a hot nozzle mount, and a junction box. The upper surface of the housing is fixedly connected to the solenoid valve, the front surface of the housing is fixedly connected to the main nozzle, the middle of the inner surface of the housing is fixedly connected to the flow divider, and a set of hot nozzle mounts are fixedly connected to both the upper and lower parts of the flow divider. A hot nozzle is fixedly connected to the inner surface of the hot nozzle mount. Double-layer cylinders are fixedly connected to both the upper and lower parts of the front surface of the housing. A valve needle is sleeved inside the hot nozzle. A hot nozzle heating coil is fixedly connected to the inner wall of the hot nozzle. A hot nozzle tip is sleeved at the end of the hot nozzle away from the double-layer cylinder. A hot nozzle core is fixedly connected at the end of the hot nozzle near the hot nozzle tip. An automatic connection device is provided on the front surface of the housing. A dust-proof device is provided on the inner surface of the hot nozzle. A junction box is fixedly connected to the upper end of the housing.

[0007] The automatic connection device includes a connecting shaft, a connecting frame fixedly connected to the outer shaft of the connecting shaft, a transmission wheel rotatably connected to the inner side of the connecting frame, a drive wheel connected to the outer arc surface of the transmission wheel via a transmission belt, a cam provided at the tail of the drive wheel, a driven wheel meshing with the outer arc surface of the drive wheel, a rotating shaft fixedly connected to the center of the inner surface of the driven wheel, and a sleeve rod slidably connected to the end of the rotating shaft away from the driven wheel.

[0008] As a further description of the above technical solution:

[0009] The dust-blocking device includes a retaining ring, an inner shaft is fixedly connected to the outer surface of the retaining ring, a movable shaft is rotatably connected to the outer arc surface of the inner shaft, and a sealing plate is fixedly connected to the outer arc surface of the movable shaft.

[0010] As a further description of the above technical solution:

[0011] A motor is fixedly connected to the end of the connecting frame away from the transmission wheel. The output shaft of the motor passes through the inside of the connecting frame and is fixedly connected to the transmission wheel.

[0012] As a further description of the above technical solution:

[0013] The inner shaft of the connecting shaft is fixedly connected to the outer casing, and the outer arc surface of the transmission wheel is connected to the cam at the tail of the drive wheel via a transmission belt.

[0014] As a further description of the above technical solution:

[0015] The transmission wheel is rotatably connected to the connecting frame, and a ring block is fixedly connected to the middle of the rotating shaft.

[0016] As a further description of the above technical solution:

[0017] The outer surface of the ring block is elastically connected to the sleeve rod by a spring, and the end of the sleeve rod away from the ring block is provided with a hexagonal groove that is the same as the protrusion on the surface of the hexagonal bolt.

[0018] As a further description of the above technical solution:

[0019] The retaining ring has a double-layer structure, with the outer ring of the retaining ring fixedly connected to the hot nozzle. The inner ring diameter of the retaining ring is smaller than the outer ring diameter, and a through hole is provided at the center of the inner surface of the movable shaft.

[0020] As a further description of the above technical solution:

[0021] The movable shaft is elastically connected to the inner shaft via a spiral spring. Multiple sets of sealing plates are provided, and the multiple sets of sealing plates are arranged in a circumferential array with the center of the central through hole of the hot nozzle as the array center. The inner side of the sealing plate is set as an arc surface.

[0022] This utility model has the following beneficial effects:

[0023] 1. In this utility model, by setting a connecting shaft, connecting frame, transmission wheel, motor, driving wheel, driven wheel, rotating shaft, ring block, and sleeve rod, after the connecting part is docked with this device, the sleeve rod is driven by the motor to start rotating, and the bolt is driven to rotate when the sleeve rod is wrapped around the outside of the internal hex bolt, thereby completing the automated fastening docking. Moreover, the motor rotation program starts and stops synchronously, which can ensure that the tightness of the connection at each connection point of this device and the feeding device is the same, thereby reducing the risk of leakage at the interface.

[0024] 2. In this utility model, the setting of the retaining ring, movable shaft, sealing plate and inner shaft can ensure the sealing of the hot nozzle when the discharge pressure is insufficient or the equipment is not used temporarily. At the same time, since it is located at the end of the hot nozzle, it can prevent dust and impurities in the external environment from remaining inside the hot nozzle, thereby causing internal raw material contamination.

[0025] 3. In this utility model, by using a double-layer cylinder to replace the ordinary cylinder in the traditional technology, the problem of insufficient air pressure caused by the injection positioning distance of the needle valve structure of high glass fiber high temperature material being too close and unable to use a large cylinder, resulting in the valve needle not reaching the bottom, is improved, which affects the product injection molding. At the same time, using a double-layer cylinder to control the valve needle can significantly increase the cylinder pressure compared with the traditional cylinder, so that the valve needle can reach the bottom. Attached Figure Description

[0026] Figure 1 This is a three-dimensional schematic diagram of a needle valve double cylinder structure proposed in this utility model;

[0027] Figure 2 This is a schematic diagram of an automatic connection device with a needle valve and a double cylinder structure proposed in this utility model;

[0028] Figure 3 This is a schematic diagram of a dust-blocking device with a needle valve and a double cylinder structure proposed in this utility model;

[0029] Figure 4 This is a schematic diagram of the inner shaft of a needle valve double cylinder structure proposed in this utility model;

[0030] Figure 5 This is a front perspective view of a needle valve double cylinder structure proposed in this utility model;

[0031] Figure 6 This is a side perspective view of a needle valve double cylinder structure proposed in this utility model.

[0032] Legend:

[0033] 1. Outer shell; 2. Automatic connection device; 3. Dustproof device; 4. Solenoid valve; 5. Junction box; 6. Hot nozzle; 7. Double-layer cylinder; 8. Main nozzle; 9. Flow divider; 10. Hot nozzle support; 11. Hot nozzle tip; 12. Hot nozzle core; 13. Hot nozzle heating coil; 14. Valve needle; 201. Connecting shaft; 202. Connecting frame; 203. Transmission wheel; 204. Motor; 205. Driving wheel; 206. Driven wheel; 207. Rotating shaft; 208. Ring block; 209. Sleeve rod; 301. Snap ring; 302. Movable shaft; 303. Sealing plate; 304. Inner shaft. Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0035] Reference Figure 1 , Figure 2 , Figure 5 as well as Figure 6This utility model provides an embodiment of a needle valve double cylinder structure, including a housing 1, a solenoid valve 4, a main nozzle 8, a flow divider 9, a hot nozzle support 10, and a junction box 5. The solenoid valve 4 is fixedly connected to the upper surface of the housing 1, the main nozzle 8 is fixedly connected to the front surface of the housing 1, the flow divider 9 is fixedly connected to the middle of the inner surface of the housing 1, a set of hot nozzle supports 10 is fixedly connected to both the upper and lower parts of the flow divider 9, a hot nozzle 6 is fixedly connected to the inner surface of the hot nozzle support 10, a double-layer cylinder 7 is fixedly connected to both the upper and lower parts of the front surface of the housing 1, a valve needle 14 is sleeved inside the hot nozzle 6, a hot nozzle heating coil 13 is fixedly connected to the inner wall of the hot nozzle 6, a hot nozzle tip 11 is sleeved at the end of the hot nozzle 6 away from the double-layer cylinder 7, a hot nozzle core 12 is fixedly connected to the end of the hot nozzle 6 near the hot nozzle tip 11, an automatic connection device 2 is provided on the front surface of the housing 1, a dustproof device 3 is provided on the inner surface of the hot nozzle 6, and a junction box 5 is fixedly connected to the upper end of the housing 1.

[0036] The automatic connecting device 2 includes a connecting shaft 201. A connecting frame 202 is fixedly connected to the outer shaft of the connecting shaft 201. A transmission wheel 203 is rotatably connected to the inner side of the connecting frame 202. The outer arc surface of the transmission wheel 203 is connected to a drive wheel 205 via a transmission belt. A cam is provided at the tail of the drive wheel 205. In this technical solution, the drive wheel 205 and the driven wheel 206 are gears that can mesh with each other. Therefore, during the rotation of the drive wheel 205, it can synchronously drive the driven wheel 206 to rotate. The outer arc surface of the drive wheel 205 meshes with the driven wheel 206. A rotating shaft 207 is fixedly connected to the center of the inner surface of the driven wheel 206. A sleeve rod 209 is slidably connected to the end of the rotating shaft 207 away from the driven wheel 206.

[0037] A motor 204 is fixedly connected to the end of the connecting frame 202 away from the transmission wheel 203. This motor 204 is a servo motor in the prior art, thus enabling control of the rotation angle of its output shaft. The output shaft of the motor 204 passes through the interior of the connecting frame 202 and is fixedly connected to the transmission wheel 203. The inner shaft of the connecting shaft 201 is fixedly connected to the outer casing 1. The outer arc surface of the transmission wheel 203 is connected to the cam at the tail of the drive wheel 205 via a transmission belt, thus enabling the transmission wheel 203 to rotate synchronously via the transmission belt. The drive wheel 205 rotates, the transmission wheel 203 is rotatably connected to the connecting frame 202, and the middle of the rotating shaft 207 is fixedly connected to the ring block 208. The outer surface of the ring block 208 is elastically connected to the sleeve rod 209 by a spring. Since the sleeve rod 209 is only slidably connected to the rotating shaft 207, it can be synchronously driven to rotate during the rotation of the rotating shaft 207. The end of the sleeve rod 209 away from the ring block 208 is provided with a hexagonal groove that is the same as the protrusion on the surface of the hexagonal bolt, so that it can be sleeved on the outside of the hexagonal bolt and synchronously drive the hexagonal bolt to rotate during its rotation.

[0038] Reference Figure 3 - Figure 4 The dust-blocking device 3 includes a retaining ring 301, an inner shaft 304 is fixedly connected to the outer surface of the retaining ring 301, a movable shaft 302 is rotatably connected to the outer arc surface of the inner shaft 304, and a sealing plate 303 is fixedly connected to the outer arc surface of the movable shaft 302.

[0039] The retaining ring 301 has a double-layer structure. The inner layer is used to connect the inner shaft 304, and the outer layer is used to connect to the hot nozzle 6. The outer ring of the retaining ring 301 is fixedly connected to the hot nozzle 6. The inner ring diameter of the retaining ring 301 is smaller than the outer ring diameter. A through hole is opened at the center of the inner surface of the movable shaft 302. The movable shaft 302 is elastically connected to the inner shaft 304 through a spiral spring. Multiple sets of sealing plates 303 are provided, and the multiple sets of sealing plates 303 are arranged in a circumferential array with the center of the central through hole of the hot nozzle 6 as the array center. Therefore, it can block the discharge port at the center of the hot nozzle 6 and prevent external dust and impurities from adhering to the inner wall of the hot nozzle 6 when it is not in use. The inner side of the sealing plate 303 is set as an arc surface, so that it will not interfere with each other when rotating. However, when it is driven to reset by the elastic force of the spiral spring, it can be blocked by the inner side of the retaining ring 301 and maintain the sealing of the opening at the center of the hot nozzle 6.

[0040] Working Principle: When using this device, the feeding pipe of the feeding device needs to be aligned and connected with the main nozzle 8 on the front of the device, and a hexagonal bolt is placed at the connection point inside the connector. At this time, the connecting frame 202 can be rotated so that the sleeve 209 in the automatic connecting device 2 can be aligned with the hexagonal bolt. Then, the sleeve 209 can be pulled to compress the spring so that it fits onto the outside of the hexagonal bolt, and its internal hexagonal groove is in close contact with the outside of the hexagonal bolt. At this time, the motor 204 can be started to drive the transmission wheel 203 to rotate. When the transmission wheel 203 rotates, it will drive the drive wheel 205 to rotate through the transmission belt. When the drive wheel 205 rotates, it will drive multiple sets of driven wheels 206 to rotate through the meshing of gears. When the driven wheels 206 rotate, they will synchronously drive the rotating shaft 207, the ring block 208 and the sleeve 209 to rotate synchronously. The sleeve 209 will drive the bolt to rotate through its internal hexagonal groove, making it rotate to a specified angle, and completing the tight connection between this device and the feeding device.

[0041] Meanwhile, when the device is not in use, due to the elastic force of the spiral spring, multiple sealing plates 303 will stick together tightly to keep the port of the hot nozzle 6 sealed. When the internal feeding pressure gradually increases, the sealing plates 303 will be pushed and the movable shaft 302 will rotate relative to the fixed shaft. At this time, the port of the hot nozzle 6 will be unsealed, and the raw material can flow out from the hot nozzle 6.

[0042] When the injection molding machine is working, the control system sends an injection signal, which is transmitted to the solenoid valve 4 to control the air intake of the double-layer cylinder 7. Compressed air enters the outer air chamber of the double-layer cylinder 7, pushing the outer piston to generate an initial force. At the same time, air also enters the inner air chamber, pushing the inner piston. The forces of the two pistons are superimposed, jointly driving the valve needle 14 connected to the piston to overcome the resistance such as spring force and move upward, moving the valve needle 14 away from the gate, opening the channel, and allowing the plastic melt to be smoothly injected into the mold cavity from the hot nozzle 6. Because the force of the double-layer cylinder 7 is relatively large, it can ensure that the valve needle 14 opens quickly and stably, ensuring that the melt fills the cavity in time. After injection, the injection signal disappears, the solenoid valve 4 is de-energized, and the air intake channel of the double-layer cylinder 7 changes. At this time, the compressed air in the outer and inner air chambers is discharged, and under the action of spring force or other restoring force, the valve needle 14 moves downward. At the same time, the double-layer cylinder can achieve precise control of the valve needle closing speed by controlling the speed and sequence of air discharge from the air chambers, so that the valve needle slowly and accurately returns to the initial position, closing the gate.

[0043] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A needle valve dual-cylinder structure, comprising a housing (1), a solenoid valve (4), a main nozzle (8), a flow divider (9), a hot nozzle mount (10), and a junction box (5), characterized in that: A solenoid valve (4) is fixedly connected to the upper surface of the housing (1). A main nozzle (8) is fixedly connected to the front surface of the housing (1). A flow divider (9) is fixedly connected to the middle of the inner surface of the housing (1). A set of hot nozzle holders (10) are fixedly connected to both the upper and lower parts of the flow divider (9). A hot nozzle (6) is fixedly connected to the inner surface of the hot nozzle holder (10). A double-layer cylinder (7) is fixedly connected to both the upper and lower parts of the front surface of the housing (1). The hot nozzle (6) is internally sleeved with... There is a valve needle (14), a heating coil (13) is fixedly connected to the inner wall of the heating nozzle (6), a heating nozzle tip (11) is sleeved on the end of the heating nozzle (6) away from the double-layer cylinder (7), a heating nozzle core (12) is fixedly connected to the end of the heating nozzle (6) near the heating nozzle tip (11), an automatic connection device (2) is provided on the front surface of the outer shell (1), a dustproof device (3) is provided on the inner surface of the heating nozzle (6), and a junction box (5) is fixedly connected to the upper end of the outer shell (1). The automatic connecting device (2) includes a connecting shaft (201), a connecting frame (202) is fixedly connected to the outer shaft of the connecting shaft (201), a transmission wheel (203) is rotatably connected to the inner side of the connecting frame (202), a drive wheel (205) is connected to the outer arc surface of the drive wheel (203) via a transmission belt, a cam is provided at the tail of the drive wheel (205), a driven wheel (206) is engaged with the outer arc surface of the drive wheel (205), a rotating shaft (207) is fixedly connected to the center of the inner surface of the driven wheel (206), and a sleeve rod (209) is slidably connected to the end of the rotating shaft (207) away from the driven wheel (206).

2. The needle valve double-cylinder structure according to claim 1, characterized in that: The dust-blocking device (3) includes a retaining ring (301), an inner shaft (304) is fixedly connected to the outer surface of the retaining ring (301), a movable shaft (302) is rotatably connected to the outer arc surface of the inner shaft (304), and a sealing plate (303) is fixedly connected to the outer arc surface of the movable shaft (302).

3. The needle valve double-cylinder structure according to claim 1, characterized in that: A motor (204) is fixedly connected to one end of the connecting frame (202) away from the transmission wheel (203). The output shaft of the motor (204) passes through the interior of the connecting frame (202) and is fixedly connected to the transmission wheel (203).

4. The needle valve double-cylinder structure according to claim 1, characterized in that: The inner shaft of the connecting shaft (201) is fixedly connected to the outer shell (1), and the outer arc surface of the transmission wheel (203) is connected to the tail cam of the drive wheel (205) via a transmission belt.

5. The needle valve double-cylinder structure according to claim 1, characterized in that: The transmission wheel (203) is rotatably connected to the connecting frame (202), and a ring block (208) is fixedly connected to the middle of the rotating shaft (207).

6. The needle valve double-cylinder structure according to claim 5, characterized in that: The outer surface of the ring block (208) is elastically connected to the sleeve rod (209) by a spring. The end of the sleeve rod (209) away from the ring block (208) is provided with a hexagonal groove that is the same as the protrusion on the surface of the hexagonal bolt.

7. A needle valve dual-cylinder structure according to claim 2, characterized in that: The retaining ring (301) has a double-layer structure. The outer ring of the retaining ring (301) is fixedly connected to the hot nozzle (6). The inner ring diameter of the retaining ring (301) is smaller than the outer ring diameter. A through hole is provided at the center of the inner surface of the movable shaft (302).

8. The needle valve double-cylinder structure according to claim 2, characterized in that: The movable shaft (302) is elastically connected to the inner shaft (304) by a spiral spring. The sealing plate (303) is provided in multiple sets, and the multiple sets of sealing plates (303) are arranged in a circumferential array with the center of the central through hole of the hot nozzle (6) as the array center. The inner side of the sealing plate (303) is set as an arc surface.

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