Electromagnetic driving device of hot runner needle valve
By employing an electromagnetic drive device in the injection molding hot runner, the movement of the sliding block is driven by a magnetic field, solving the problems of poor synchronization and insufficient air pressure in traditional cylinders. This achieves synchronous control of multiple hot nozzles and enhanced driving force, thereby improving product quality and production efficiency.
Patent Information
- Application Number
- CN202520080287.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-13
- Publication Date
- 2026-01-27
- Estimated Expiration
- 2035-01-13
AI Technical Summary
In traditional injection molding hot runner cylinders, the piston movements of multiple cylinders on the same mold are not synchronized, resulting in inconsistent valve needle opening times at the gate. When the air pressure is insufficient, the valve needle thrust is too small, affecting product quality and production efficiency.
An electromagnetic drive device is adopted, which generates a magnetic field by designing an energized coil in the cylinder. The magnetic field drives the sliding block to move, replacing the traditional pneumatic drive, thereby realizing synchronous control of the needle valve and increasing the driving force.
It achieves better synchronization of multiple hot nozzles, faster response speed, and greater driving force, solving the problems of poor synchronization and insufficient air pressure in traditional cylinders, and improving product molding quality and production efficiency.
Smart Images
Figure CN223834973U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of injection molding hot runners, and specifically discloses an electromagnetic drive device for a hot runner needle valve. Background Technology
[0002] Needle valve hot runner cylinders are a key component in injection molds. Their main function is to control the opening and closing of the gate through the mechanical action of the valve needle, thereby achieving precise injection of molten plastic. Needle valve hot runner systems have advantages such as minimal residue, low residual stress, and no drooling or stringing, significantly improving product quality and production efficiency.
[0003] Currently, traditional injection molding hot runner cylinders are typically powered by air pressure, such as Figure 1 As shown, the piston drives the valve needle to move up and down. However, due to the compressibility of air, existing injection molding hot runner systems often have multiple cylinders on the same mold. This leads to the following problems: First, when multiple cylinders are on the same mold, the piston movements in each cylinder are often asynchronous. This causes the valve needle to open the gate at inconsistent times, resulting in unbalanced product molding and ultimately product failure. Second, when the air pressure is insufficient, the thrust of the valve needle is too small to effectively close the gate, further affecting product quality and production efficiency. Therefore, there is an urgent need to propose a new type of injection molding hot runner cylinder that uses other piston power to replace conventional pneumatic power to solve the above problems. Utility Model Content
[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide an electromagnetic drive device for a hot runner needle valve.
[0005] This utility model discloses an electromagnetic drive device for a hot runner needle valve, which adopts the following technical solution:
[0006] An electromagnetic drive device for a hot runner needle valve includes a cylinder body, a cylinder head, and a base forming a sliding cavity, a sliding block slidably disposed within the sliding cavity, and a needle valve connected to the sliding block. It also includes a first coil holder and a second coil holder. The first coil holder is disposed within the sliding cavity, and a first coil is wound in the first coil holder. When the first coil is energized, a magnetic field is formed on the first coil holder. The second coil holder is disposed on the sliding block, and a second coil is wound in the second coil holder. When the second coil is energized, a magnetic field is formed on the sliding block. The magnetic field of the first coil holder and the magnetic field of the second coil holder may have the same or opposite poles.
[0007] Preferably, the first coil holder is disposed between the cylinder head and the cylinder block.
[0008] Preferably, the bottom of the cylinder head is provided with a positioning groove for the top of the first coil seat to be embedded and fixed.
[0009] Another alternative technical solution is an electromagnetic drive device for a hot runner needle valve, comprising a cylinder body, a cylinder head, and a base forming a sliding cavity, a sliding block slidably disposed within the sliding cavity, and a needle valve connected to the sliding block, and further comprising a first coil holder and a second coil holder; the first coil holder and the second coil holder are disposed within the sliding cavity along the sliding direction of the sliding block, the first coil holder has a first coil wound in it, and the second coil holder has a second coil sleeved in it; the sliding block is made of magnetic material, and when the first coil is energized, a magnetic field is formed on the first coil holder to attract the sliding block and move it in that direction, and when the second coil is energized, a magnetic field is formed on the second coil holder to attract the sliding block and move it in that direction.
[0010] Preferably, a second coil holder replaces the base, and the second coil holder abuts against the lower end of the cylinder body.
[0011] Preferably, the first coil holder is disposed between the cylinder head and the cylinder block, and the bottom of the cylinder head is provided with a positioning groove for the top of the first coil holder to be embedded and fixed.
[0012] Preferably, the first coil holder includes a first fixing sleeve and a first coil sleeve, the first coil is wound and fixed on the first fixing sleeve, and the first coil sleeve is covered and fixed outside the first fixing sleeve; the second coil holder includes a second fixing sleeve and a second coil sleeve, the second coil is wound and fixed on the second fixing sleeve, and the second coil sleeve is covered and fixed outside the second fixing sleeve.
[0013] Another alternative technical solution is an electromagnetic drive device for a hot runner needle valve, comprising a cylinder body, a cylinder head, and a base forming a sliding cavity, a sliding block slidably disposed within the sliding cavity, and a needle valve connected to the sliding block, and further comprising a first conductive post and a second conductive post; the first conductive post and the second conductive post are disposed within the sliding cavity parallel to the sliding direction of the sliding block, the sliding block is provided with a first connecting hole and a second connecting hole, the first connecting hole is slidably connected to the first conductive post, the second connecting hole is slidably connected to the second conductive post, and the first conductive post and the second conductive post are respectively energized and form a circuit through the sliding block.
[0014] Preferably, a first pad is provided at the top of the sliding cavity, and a second pad is provided at the bottom of the sliding cavity. The upper ends of the first conductive post and the second conductive post are respectively inserted and fixed to the first pad, and the lower ends of the first conductive post and the second conductive post are respectively inserted and fixed to the second pad.
[0015] Preferably, the second pad replaces the base.
[0016] Compared with the prior art, the present invention has at least the following beneficial effects:
[0017] This invention utilizes an energized coil designed within the cylinder body. By leveraging the magnetic field generated by the energized coil, which in turn generates electromagnetic force, the sliding block is driven to move within the cylinder body, thereby achieving the purpose of driving the needle valve. This replaces the traditional injection molding hot runner cylinder and solves the problems of poor synchronization of multiple piston movements and insufficient air pressure inherent in traditional cylinders. The electromagnetic drive device of this solution generates a magnetic field instantly upon energization, resulting in faster response, better synchronization, and greater driving force. It is particularly suitable for controlling multiple hot nozzles in a single mold. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of a cylinder structure in the prior art;
[0019] Figure 2 This is a schematic diagram of the electromagnetic drive device for the hot runner needle valve in Example 1;
[0020] Figure 3 This is a schematic diagram of the magnetic fields of the electromagnetic drive device in Example 1 repelling each other;
[0021] Figure 4 This is a schematic diagram of the magnetic field attraction between opposite poles of the electromagnetic drive device in Example 1;
[0022] Figure 5 This is a schematic diagram of the electromagnetic drive device for the hot runner needle valve in Example 2;
[0023] Figure 6 This is a schematic diagram of the electromagnetic drive device for the hot runner needle valve in Example 3.
[0024] Explanation of icon numbers:
[0025] 1. Cylinder block; 2. Cylinder head; 21. Positioning groove; 3. Base; 4. Needle valve; 5. Piston; 6. Air passage; 7. Sliding block; 8. First coil holder; 81. First coil; 9. Second coil holder; 91. Second coil; 10. First conductive post; 11. Second conductive post; 12. First pad; 13. Second pad. Detailed Implementation
[0026] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0027] Example 1
[0028] An electromagnetic drive device for a hot runner needle valve, referenced Figure 2It includes a cylinder body 1, a cylinder head 2 and a base 3 that form a sliding cavity, a sliding block 7 that is slidably disposed in the sliding cavity, and a needle valve 4 connected to the sliding block. The sliding block 7 and the base 3 are fitted with a slight clearance to guide the sliding block 7 to move vertically. As the sliding block 7 moves up and down in the sliding cavity, the needle valve 4 moves accordingly to control the opening and closing of the hot nozzle.
[0029] Unlike traditional devices that use air pressure to drive needle valves, the driving device in this embodiment is electromagnetically driven, including a first coil holder 8 and a second coil holder 9. The first coil holder 8 is disposed in the sliding cavity, and a first coil 81 is wound in the first coil holder 8. When the first coil 81 is energized, a magnetic field is formed on the first coil holder 8. The second coil holder 9 is disposed on the sliding block 7, and a second coil 91 is wound in the second coil holder 9. When the second coil 91 is energized, a magnetic field is formed on the sliding block 7.
[0030] Specifically, the first coil holder 8 includes a first fixed sleeve and a first coil sleeve. The first coil 81 is wound and fixed on the first fixed sleeve, and the first coil sleeve is fixed and covered outside the first fixed sleeve. The second coil holder 9 includes a second fixed sleeve and a second coil sleeve. The second coil 91 is wound and fixed on the second fixed sleeve, and the second coil sleeve is fixed and covered outside the second fixed sleeve. The first coil holder 8 and the second coil holder 9 have the advantages of high reliability and good structural stability. Openings for introducing energized wires are respectively provided on the first coil sleeve or the cylinder body 1. The number of turns of the first coil 81 and the second coil 91 can be set according to actual needs and is not limited in this solution.
[0031] In this embodiment, the first coil holder 8 is disposed between the cylinder head 2 and the cylinder body 1. The bottom of the cylinder head 2 is provided with a positioning groove 21 for the top of the first coil holder 8 to be embedded and fixed, thereby making the first coil holder 8 stably installed near the top of the sliding cavity. The second coil holder 9 is fixed to the top of the sliding block 7. Of course, in other embodiments, the first coil holder 8 can also be disposed near the bottom of the sliding cavity. However, in this embodiment, the first coil holder 8 is disposed on the cylinder head 2, which facilitates the arrangement of wires and makes installation and maintenance easier.
[0032] Reference Figure 3-4 The first coil holder 8 generates a magnetic field when energized by winding the first coil 81, thus becoming an electromagnet. At the same time, the second coil holder 9 outside the sliding block 7 also becomes an electromagnet when energized by winding the second coil 91. By changing the direction of the current flow, the polarity of the electromagnet can be changed, so that the magnetic field of the first coil holder 8 and the magnetic field of the second coil holder 9 are of the same or opposite poles. According to the principle that like poles repel and unlike poles attract, the sliding block 7 is pushed up and down, thereby achieving the purpose of driving the needle valve 4.
[0033] Example 2
[0034] An electromagnetic drive device for a hot runner needle valve, referenced Figure 5 The difference between this embodiment and Embodiment 1 is that the second coil holder 9 is positioned differently.
[0035] In this embodiment, the first coil holder 8 and the second coil holder 9 are disposed within the sliding cavity along the sliding direction of the sliding block 7. A first coil 81 is wound in the first coil holder 8, and a second coil 91 is sleeved in the second coil holder 9. Preferably, the first coil holder 8 is disposed between the cylinder head 2 and the cylinder body 1, and the second coil holder 9 is disposed below the cylinder body 1 and abuts against the lower end of the cylinder body 1. The second coil holder 9 can replace the base 3, reducing the number of parts used and lowering costs. The sliding block 7 is made of magnetic material. When the first coil 81 is energized, a magnetic field is formed on the first coil holder 8, attracting the sliding block 7 and causing it to move in that direction. When the second coil 91 is energized, a magnetic field is formed on the second coil holder 9, attracting the sliding block 7 and causing it to move in that direction. A slight clearance fit exists between the sliding block 7 and the cylinder body 1, guiding the sliding block 7 to move vertically.
[0036] By storing a large amount of charge in the capacitor, different capacitors connect the first coil 81 and the second coil 91 at certain times. The first coil 81 and the second coil 91 are instantly energized, generating a large magnetic field that attracts the sliding block 7 to move. When the first coil 81 is energized, the second coil 91 is not energized, attracting the sliding block 7 to move upward. When the second coil 91 is energized, the first coil 81 is not energized, attracting the sliding block 7 to move downward, thereby achieving the purpose of driving the needle valve 4.
[0037] Example 3
[0038] An electromagnetic drive device for a hot runner needle valve, referenced Figure 6 The difference between this embodiment and embodiment 1 is that by setting two conductive rods in the cylinder 1 and cooperating with the sliding block 7 to form a coil circuit to generate electromagnetic force, the needle valve is driven to move using the electromagnetic principle.
[0039] In this embodiment, a first conductive post 10 and a second conductive post 11 are included. The first conductive post 10 and the second conductive post 11 are arranged parallel to the sliding direction of the sliding block 7 within the sliding cavity. A first pad 12 is provided at the top of the sliding cavity, and a second pad 13 is provided at the bottom of the sliding cavity. The upper ends of the first conductive post 10 and the second conductive post 11 are respectively inserted and fixed to the first pad 12, and the lower ends of the first conductive post 10 and the second conductive post 11 are respectively inserted and fixed to the second pad 13. Preferably, the second pad 13 can replace the base 3 to reduce the number of components. The sliding block 7 has a first connecting hole and a second connecting hole. The first connecting hole is slidably connected to the first conductive post 10, and the second connecting hole is slidably connected to the second conductive post 11. The first conductive post 10 and the second conductive post 11 are respectively energized and form a circuit through the sliding block 7. The first conductive post 10 and the second conductive post 11 also serve to vertically guide the movement of the sliding block 7.
[0040] By connecting a power source to the wire, a magnetic field is generated (the direction of the magnetic field is determined according to the right-hand screw rule). Then, according to Fleming's left-hand rule, the direction of the force on the wire is determined, and the movement of the sliding block 7 is controlled. The direction of movement of the sliding block 7 is controlled by the direction of current flow, thereby achieving the purpose of driving the needle valve 4.
[0041] The electromagnetic drive device of the hot runner needle valve in the above three embodiments replaces the traditional cylinder drive structure, solving the technical deficiencies in plastic molding such as asynchronous opening of the gate by the valve needle, insufficient cylinder thrust, and jamming of the valve needle and valve sleeve, which cause the product to fail to be molded normally.
[0042] The technical solution provided by this utility model has been described in detail above. Specific examples have been used to illustrate the principle and implementation of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.
Claims
1. An electromagnetic drive device for a hot runner needle valve, comprising a cylinder body, a cylinder head, and a base forming a sliding chamber, a sliding block slidably disposed within the sliding chamber, and a needle valve connected to the sliding block, characterized in that, It also includes a first coil holder and a second coil holder; The first coil holder is disposed in the sliding cavity, and a first coil is wound in the first coil holder. When the first coil is energized, a magnetic field is formed on the first coil holder. The second coil holder is disposed on the sliding block, and a second coil is wound in the second coil holder. When the second coil is energized, a magnetic field is formed on the sliding block. The magnetic field of the first coil holder and the magnetic field of the second coil holder are either of the same pole or opposite pole.
2. The electromagnetic drive device for the hot runner needle valve according to claim 1, characterized in that, The first coil holder is disposed between the cylinder head and the cylinder block.
3. The electromagnetic drive device for the hot runner needle valve according to claim 2, characterized in that, The bottom of the cylinder head is provided with a positioning groove for the top of the first coil seat to be embedded and fixed.
4. An electromagnetic drive device for a hot runner needle valve, comprising a cylinder body, a cylinder head, and a base forming a sliding chamber, a sliding block slidably disposed within the sliding chamber, and a needle valve connected to the sliding block, characterized in that, It also includes a first coil holder and a second coil holder; The first coil holder and the second coil holder are disposed in the sliding cavity along the sliding direction of the sliding block. A first coil is wound in the first coil holder, and a second coil is sleeved in the second coil holder. The sliding block is made of magnetic material. When the first coil is energized, a magnetic field is formed on the first coil holder, which attracts the sliding block and moves it in that direction. When the second coil is energized, a magnetic field is formed on the second coil holder, which attracts the sliding block and moves it in that direction.
5. The electromagnetic drive device for the hot runner needle valve according to claim 4, characterized in that, The second coil holder replaces the base and abuts against the lower end of the cylinder.
6. The electromagnetic drive device for the hot runner needle valve according to claim 4, characterized in that, The first coil holder is disposed between the cylinder head and the cylinder block, and the bottom of the cylinder head is provided with a positioning groove for the top of the first coil holder to be embedded and fixed.
7. The electromagnetic drive device for the hot runner needle valve according to claim 1 or 4, characterized in that, The first coil holder includes a first fixing sleeve and a first coil sleeve, the first coil is wound and fixed on the first fixing sleeve, and the first coil sleeve is covered and fixed outside the first fixing sleeve; the second coil holder includes a second fixing sleeve and a second coil sleeve, the second coil is wound and fixed on the second fixing sleeve, and the second coil sleeve is covered and fixed outside the second fixing sleeve.
8. An electromagnetic drive device for a hot runner needle valve, comprising a cylinder body, a cylinder head, and a base forming a sliding chamber, a sliding block slidably disposed within the sliding chamber, and a needle valve connected to the sliding block, characterized in that, It also includes the first conductive post and the second conductive post; The first conductive post and the second conductive post are arranged in the sliding cavity parallel to the sliding direction of the sliding block. The sliding block is provided with a first connecting hole and a second connecting hole. The first connecting hole is slidably connected to the first conductive post, and the second connecting hole is slidably connected to the second conductive post. The first conductive post and the second conductive post are respectively energized and form a circuit through the sliding block.
9. The electromagnetic drive device for the hot runner needle valve according to claim 8, characterized in that, The sliding cavity has a first pad at the top and a second pad at the bottom. The upper ends of the first and second conductive posts are respectively inserted and fixed to the first pad, and the lower ends of the first and second conductive posts are respectively inserted and fixed to the second pad.
10. The electromagnetic drive device for the hot runner needle valve according to claim 9, characterized in that, The second pad replaces the base.