Injector body and hot runner system

Abstract

This invention belongs to the field of injection molding, and specifically relates to a syringe body and hot runner system, which solves the problem of easy leakage of molten material. The syringe body includes a sleeve with a first channel. A nozzle communicating with the first channel is located at the top of the sleeve. A base is located at the bottom of the sleeve, and a second channel communicating with the first channel is located on the base, with the second channel inclined to the first channel. A valve needle channel communicating with the first channel is also located on the base, and the valve needle channel is coaxial with the first channel. A circumferential anti-rotation structure is located on one side of the base near the second channel. This invention achieves a compact syringe body, good sealing of the hot runner system, and a compact structure.

Description

Technical Field

[0001] This invention belongs to the field of injection molds, and specifically relates to a syringe body and a hot runner system. Background Technology

[0002] In an injection molding system, the mold consists of two parts: one part is fixed on the injection molding machine, and the other part is a moving component composed of multiple plates. The two parts are connected in a sandwich form and firmly fixed to each other. In special applications where the size of the hot runner system must be reduced, the connection of the components is not just for fixation, but for precise positioning. The clamping of the hot runner system components is accomplished by screwing the plates together, which makes it difficult to achieve a small size and compact structure.

[0003] The pressure of the plastic material inside the mold often tends to cause the components of the hot runner system to separate from each other, especially when the body of the syringe and the cylinder are directly located upstream of the hot runner system, the plastic material is prone to leakage. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned problems in the prior art by proposing a compact syringe body.

[0005] Another objective of this invention is to address the aforementioned problems in the prior art by proposing a hot runner system with good sealing performance and a compact structure.

[0006] To achieve the innovative purpose of this invention, the following technical solution can be used: A syringe body includes a sleeve with a first channel, a nozzle communicating with the first channel is provided at the top of the sleeve, a base is provided at the bottom of the sleeve, a second channel communicating with the first channel is provided on the base, and the second channel is inclined to the first channel. The base is also provided with a valve needle channel communicating with the first channel, the valve needle channel is coaxial with the first channel, and a circumferential anti-rotation structure is provided on one side of the base located on the second channel.

[0007] The sleeve and base are integrated to reduce the possibility of leakage. A first channel is provided in the sleeve, and a second channel is provided in the base. The two ends of the first channel are connected to the nozzle and the second channel, respectively. Molten material flows through the second channel and the first channel and is finally ejected from the nozzle. The valve needle channel is coaxial with the first channel, and the valve needle passes through the valve needle channel and the first channel to control the flow rate of the first channel. A circumferential anti-rotation structure is provided on the side of the base to break the rotational symmetry and avoid unnecessary circumferential rotation.

[0008] In the syringe body described above, the circumferential anti-rotation structure includes a radial protrusion disposed on one side of the base located in the second channel.

[0009] By setting radial protrusions on the side of the base to break the rotational symmetry, the structure is simple and has a good anti-rotation effect.

[0010] In the syringe body described above, the radial protrusion is integrated with the base, and the second channel is located between the radial protrusion and the base.

[0011] The radial protrusions are integrated with the base, which on the one hand prevents unnecessary circumferential rotation, and on the other hand, the overall asymmetrical geometry ensures better sealing of the hot chamber. The radial protrusions can better press down on the integrated structure, which helps to improve the sealing performance.

[0012] In the syringe body described above, the base and the radially protruding bottom surface are flat and coplanar.

[0013] The base and the bottom surface of the radial protrusion are coplanar, which simplifies the structure at this point. At the same time, it makes the machining of the bottom surface and the connecting surface that needs to be connected to the base and the radial protrusion more convenient. It can be completed in a single machining operation, reducing unnecessary machining costs and making installation easier.

[0014] In the syringe body described above, an annular inclined portion is provided between the base and the sleeve.

[0015] The annular inclined section is equivalent to creating a chamfer between the base and the sleeve, providing a spatial basis for setting up a straight inclined channel inside.

[0016] In the syringe body described above, the second channel is provided with an annular inclined portion.

[0017] The second channel section is located in the annular inclined section, which is inclined.

[0018] A hot runner system includes a manifold, with several syringe mounting seats symmetrically arranged on both sides of the manifold. A base mounting groove is provided above the syringe mounting seat, and the syringe body is placed in the base mounting groove. A needle valve is provided in a first channel, and the lower end of the needle valve passes through a valve needle channel and is connected to a valve needle drive mechanism in the syringe mounting seat. The second channel is connected to the manifold channel of the manifold through a connecting channel on the syringe mounting seat.

[0019] The base of the syringe body is set in the base mounting groove to connect with the syringe mounting seat. A needle valve is provided in the first channel to control the flow rate of the first channel, thereby controlling the flow rate of the nozzle. The valve needle drive mechanism specifically drives the valve needle to move in and out in the axial direction. The connecting channel is opened on the syringe mounting seat, which connects the second channel and the flow divider channel of the flow divider plate. This ensures that the molten material flows through the flow divider channel in sequence through the connecting channel, the second channel, and the first channel, and is smoothly output from the nozzle, completing the delivery of the molten material.

[0020] In the hot runner system described above, the manifold is H-shaped and has a liquid supply port that is connected to the manifold channel. Four syringe mounting seats are provided on both sides of the manifold, arranged symmetrically.

[0021] Molten material is fed into the internal channels through the liquid supply port. Four syringe mounting seats are symmetrically arranged on the upper and lower sides of the flow divider, which can install a total of eight syringe bodies to meet the requirement of simultaneous output of up to eight syringe bodies.

[0022] In the aforementioned hot runner system, the bottom surface of the base mounting groove is adapted to the bottom surface of the base and the radial protrusion, and the sidewall of the base mounting groove matches the base and the radial protrusion.

[0023] The bottom shape of the base mounting groove is adapted to the bottom surfaces of the base and the radial protrusion, ensuring that the base and the radial protrusion can fit perfectly into the base mounting groove, and that the side walls fit together, reducing unnecessary radial offset and limiting circumferential rotation, which helps to achieve a good sealing effect.

[0024] In the hot runner system described above, a positioning rod is provided between the base and the base mounting groove. One end of the positioning rod is inserted into the base, and the other end is inserted into the syringe mounting base.

[0025] The two ends of the positioning rod are inserted into the base and the syringe mounting seat respectively, which serves as a positioning function to ensure that each channel can be smoothly connected.

[0026] Compared with existing technologies,

[0027] 1. The base side of the syringe body is provided with radial protrusions to break the rotational symmetry and avoid unnecessary circumferential rotation of the syringe body. At the same time, the radial protrusions can better press the syringe body down and improve the sealing performance.

[0028] 2. The flow divider is H-shaped, with four syringe mounting seats symmetrically arranged on its upper and lower sides, which can enable up to eight syringe bodies to work simultaneously, resulting in high efficiency.

[0029] 3. The base and the bottom surface of the radial protrusion are flat and coplanar, and the bottom surface of the base mounting groove that matches it is also flat, which can be formed in a single process, reducing processing costs.

[0030] 4. The bottom surface of the base mounting groove is adapted to the bottom surface of the base and the radial protrusion. The side wall of the base mounting groove matches the base and the radial protrusion, ensuring that the base and the radial protrusion can be smoothly installed on the syringe mounting seat. At the same time, it effectively avoids unnecessary circumferential rotation and helps to improve the sealing performance. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the overall structure of the hot runner system of the present invention;

[0032] Figure 2 This is a top view of the hot runner system of the present invention;

[0033] Figure 3 yes Figure 2 Cross-sectional view at point AA;

[0034] Figure 4 This is a schematic diagram of the structure of the syringe body of the present invention;

[0035] Figure 5 This is a front view of the syringe body of the present invention.

[0036] In the figure, the components are: sleeve 1, first channel 11, nozzle 12, needle valve 13, base 2, second channel 21, valve needle channel 22, circumferential anti-rotation structure 3, radial protrusion 31, annular inclined part 4, annular groove 41, flow divider 5, liquid supply port 51, flow divider channel 52, syringe mounting base 6, base mounting groove 61, positioning rod 62, connecting channel 63, inclined section 64, vertical section 65, valve needle drive mechanism 7, driver 71, drive cavity 72, inlet hole 73, and outlet hole 74. Detailed Implementation

[0037] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0038] Specific implementation examples Figure 1-5 As shown, the main body of this syringe includes a sleeve 1 with a first channel 11. The top of the sleeve 1 is provided with a nozzle 12 communicating with the first channel 11. The characteristic is that the bottom of the sleeve 1 is provided with a base 2. A second channel 21 communicating with the first channel 11 is provided on the base 2, and the second channel 21 is inclined to the first channel 11. The base 2 is also provided with a valve needle channel 22 communicating with the first channel 11. The valve needle channel 22 is coaxial with the first channel 11. The base 2 is provided with a circumferential anti-rotation structure 3 on one side of the second channel 21.

[0039] Specifically, the sleeve 1 and the base 2 are integrated to reduce the possibility of leakage. The sleeve 1 has a first channel 11, and the base 2 has a second channel 21. The two ends of the first channel 11 are connected to the nozzle 12 and the second channel 21, respectively. The molten material flows through the second channel 21 and the first channel 11 and is finally ejected from the nozzle 12. The valve needle channel 22 is coaxial with the first channel 11, and the valve needle passes through the valve needle channel 22 and the first channel 11 to control the flow rate of the first channel 11. The circumferential anti-rotation structure 3 is provided on the side of the base 2 to break the rotational symmetry and avoid unnecessary circumferential rotation.

[0040] like Figure 3 , Figure 4 , Figure 5 As shown, the circumferential anti-rotation structure 3 includes a radial protrusion 31 disposed on one side of the base 2 located in the second channel 21. The radial protrusion 31 is integrally connected with the base 2. The second channel 21 is located between the radial protrusion 31 and the base 2. The bottom surfaces of the base 2 and the radial protrusion 31 are flat and coplanar.

[0041] Specifically, rotational symmetry is broken by setting radial protrusions 31 on the side of the base 2. The structure is simple and has a good anti-rotation effect. The radial protrusions 31 and the base 2 are an integral structure with better structural strength. Of course, they can also be formed by connecting individual parts. On the one hand, the radial protrusions 31 can prevent unnecessary circumferential rotation. On the other hand, the overall asymmetrical geometry of the radial protrusions 31 and the base 2 ensures better sealing of the hot chamber. The radial protrusions 31 can better press down on the integral structure, which helps to improve the sealing performance.

[0042] Furthermore, the base 2 and the bottom surface of the radial protrusion 31 are coplanar, which simplifies the structure at this location and helps to improve the sealing performance. At the same time, the processing of the bottom surface at this location and the connecting surface that needs to be connected to the base 2 and the radial protrusion 31 is more convenient, and can be completed in a single processing, reducing processing costs and making installation easier.

[0043] like Figure 4 , Figure 5 As shown, an annular inclined portion 4 is provided between the base 2 and the sleeve 1, and the second channel 21 passes through the annular inclined portion 4.

[0044] Specifically, in terms of cross-section, the annular inclined portion 4 is equivalent to setting a chamfer between the base 2 and the sleeve 1, providing a spatial basis for setting a straight inclined channel inside. The second channel 21 is inclined and located in the annular inclined portion 4.

[0045] In the optimized design, an annular groove 41 is provided between the annular inclined part 4 and the base 2. The annular groove 41 and the bottom surface of the base 2 connected thereto can abut against the mold, and the internal hot chamber can be sealed by appropriately setting clamping screws, thus having good sealing performance.

[0046] like Figure 1-3 As shown, this hot runner system includes a manifold 5. Several syringe mounting seats 6 are symmetrically arranged on both sides of the manifold 5. A base mounting groove 61 is provided above the syringe mounting seat 6. The syringe body is provided in the base mounting groove 61. A needle valve 13 is provided in the first channel 11. The lower end of the needle valve 13 passes through a valve needle channel 22 and is connected to the valve needle drive mechanism 7 in the syringe mounting seat 6. The second channel 21 is connected to the manifold channel 52 of the manifold 5 through the connecting channel 63 on the syringe mounting seat 6.

[0047] Specifically, the base 2 of the syringe body is set in the base mounting groove 61 to connect the syringe body and the syringe mounting seat 6. The first channel 11 is provided with a needle valve 13 to control the flow of the first channel 11, thereby controlling the discharge flow of the nozzle 12. The valve needle drive mechanism 7 specifically drives the needle valve 13 to move in and out in the axial direction. The connecting channel 63 is opened on the syringe mounting seat 6, which connects the second channel 21 and the diversion channel 52 of the diversion plate 5, ensuring that the molten material flows through the diversion channel 52 in sequence through the connecting channel 63, the second channel 21 and the first channel 11, and is smoothly output from the nozzle 12 to complete the delivery of the molten material.

[0048] In addition, the valve needle drive mechanism 7 includes a drive cavity 72 disposed in the syringe mounting base 6. The drive cavity 72 is provided with a driver 71 (the structure of the driver 71 is common knowledge and will not be described in detail). The syringe mounting base 6 is provided with an inlet hole 73 and an outlet hole 74 connected to the drive cavity 72. The inlet hole 73 is used to install the valve needle driver 71 and the needle valve 13, and the outlet hole 74 is used to extend the valve needle into the first channel 11.

[0049] The optimized connecting channel 63 includes an inclined section 64 and a vertical section 65. The vertical section 65 is connected to the diversion channel 52, and the inclined section 64 is connected to the second channel 21. The inclined section 64 and the second channel 21 are coaxially arranged.

[0050] Preferably, in a single syringe body, the first channel 11 can also be multiple channels, which converge to the nozzle 12. Similarly, the second channel 21 can also be multiple channels, which converge and connect to the connecting channel 63 and the first channel 11.

[0051] like Figure 1 , Figure 2 As shown, the flow divider 5 is H-shaped and has a liquid supply port 51. The liquid supply port 51 is connected to the flow divider channel 52. There are four syringe mounting seats 6 arranged symmetrically on both sides of the flow divider 5.

[0052] Specifically, the molten material is fed into each channel through the liquid supply port 51. Four syringe mounting seats 6 are symmetrically arranged on the upper and lower sides of the diverter plate 5, so that the forces on the upper and lower sides are relatively balanced. A total of eight syringe bodies can be installed to meet the condition of simultaneous output of up to eight syringes, which is more efficient.

[0053] In terms of optimization, the bottom surface of the base mounting groove 61 is adapted to the bottom surfaces of the base 2 and the radial protrusion 31, and the sidewalls of the base mounting groove 61 are matched with the base 2 and the radial protrusion 31. The shape of the bottom surface of the base mounting groove 61 is adapted to the bottom surfaces of the base 2 and the radial protrusion 31, ensuring that the base 2 and the radial protrusion 31 can be precisely inserted into the base mounting groove 61, and the sidewalls fit together, reducing unnecessary radial offset and restricting circumferential rotation, which helps to achieve a good sealing effect.

[0054] In an optimized configuration, a positioning rod 62 is provided between the base 2 and the base mounting groove 61. One end of the positioning rod 62 is inserted into the base 2, and the other end is inserted into the syringe mounting seat 6. The two ends of the positioning rod 62 are respectively inserted into the base 2 and the syringe mounting seat 6, serving a positioning function to ensure that each channel can be accurately connected.

[0055] Specific working principle: After installation, the bottom surfaces of the base 2 and radial protrusions 31 are in contact with the bottom surface of the base mounting groove 61. The side walls of the base 2 and radial protrusions 31 are in contact with the side walls of the base mounting groove 61, and the bottom surface of the base 2 and the position of the annular groove 41 abut against the mold, that is, the syringe body is pressed down into the syringe mounting seat 6, forming a good seal. Molten material is distributed into each diversion channel 52 through the liquid supply port 51, and then flows sequentially through the connecting channel 63, the second channel 21, and the first channel 11, and then outputs from the nozzle 12. The needle valve 13 in the first channel 11 can move axially under the drive control of the driver 71, which is used to control the start and stop of the nozzle 12 discharge and the flow rate.

[0056] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A hot runner system, characterized in that, Includes a flow divider (5), on both sides of the flow divider (5) are provided a plurality of syringe mounting seats (6) arranged symmetrically above and below, and a base mounting groove (61) is provided above the syringe mounting seat (6), and the syringe body is provided in the base mounting groove (61); The syringe body includes a sleeve (1) having a first channel (11), a nozzle (12) communicating with the first channel (11) at the top of the sleeve (1), a base (2) at the bottom of the sleeve (1), a second channel (21) communicating with the first channel (11) on the base (2), and the second channel (21) is inclined to the first channel (11). The base (2) also has a valve needle channel (22) communicating with the first channel (11), the valve needle channel (22) is coaxial with the first channel (11), and the base (2) has a circumferential anti-rotation structure (3) on one side of the second channel (21). The circumferential anti-rotation structure (3) includes a radial protrusion (31) disposed on one side of the base (2) located in the second channel (21). The radial protrusion (31) is integrated with the base (2). The second channel (21) is located between the radial protrusion (31) and the base (2). The bottom surfaces of the base (2) and the radial protrusion (31) are flat and coplanar. The bottom surface of the base mounting groove (61) is adapted to the bottom surface of the base (2) and the radial protrusion (31), and the sidewall of the base mounting groove (61) matches the base (2) and the radial protrusion (31). A positioning rod (62) is provided between the base (2) and the base mounting groove (61). One end of the positioning rod (62) is inserted into the base (2), and the other end is inserted into the syringe mounting seat (6). A needle valve (13) is provided in the first channel (11). The lower end of the needle valve (13) passes through the valve needle channel (22) and is connected to the valve needle drive mechanism (7) in the syringe mounting base (6). The second channel (21) is connected to the diversion channel (52) of the diversion plate (5) through the connecting channel (63) on the syringe mounting base (6).

2. The hot runner system according to claim 1, characterized in that, An annular inclined portion (4) is provided between the base (2) and the sleeve (1).

3. The hot runner system according to claim 2, characterized in that, The second channel (21) is provided with an annular inclined section (4).

4. The hot runner system according to claim 1, characterized in that, The flow divider (5) is H-shaped and has a liquid supply port (51) on it. The liquid supply port (51) is connected to the flow divider channel (52). Four syringe mounting seats (6) are provided on both sides of the flow divider (5) in a symmetrical arrangement.

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