An extruder discharge valve

Abstract

The application discloses an extruder discharge valve, which comprises a valve body and a valve core. The valve body is provided with an inlet, an outlet and a discharge port. The inlet and the outlet are arranged on opposite side walls of the valve body and are located on the same central axis. The communication direction of the inlet and the outlet is perpendicular to the installation direction of the valve core. The discharge port is located on the side wall of the valve body between the inlet and the outlet. The valve core is rotatably installed on the valve body and is provided with a through material flow channel. The material flow channel can communicate with the inlet and the outlet. The outer circumferential side of the valve core is further provided with a discharge groove. The length direction of the discharge groove is the same as the direction of the material flow channel. When the valve core rotates, the inlet can communicate with the discharge port. The application has simple structure. The conversion of the working position and the discharge position is realized by changing the angle of the valve core. The material can be discharged in the initial stage of the machine operation or when the filter screen is replaced or the flow channel is cleaned, so that the normal maintenance work is ensured. Meanwhile, the molten material flow can be ensured at any time, so that the blockage caused by hardening is avoided.

Description

Technical Field

[0001] This invention relates to the field of discharge valve technology, and specifically to a discharge valve for an extruder. Background Technology

[0002] In the production of plastic products such as films and spinning, it is essential to ensure the constant flow of molten plastic in the pipelines. Since the molten material may undergo high-temperature coking, low-temperature hardening, or plasticity changes in the pipelines after shutdown, it is crucial to minimize equipment downtime and frequency. However, if the melt filter or a section of the pipeline becomes clogged, immediate shutdown or disconnection of that section for maintenance is necessary, with a return to normal operation as quickly as possible. To ensure that no molten material remains inside the pipeline during maintenance, a portion of the molten material must be released beforehand using a discharge valve. Simply using existing valves (ball valves) to shut down the pipeline can easily lead to molten material accumulation, hardening, or coking during maintenance, subsequently clogging pipelines and valves and disrupting normal molten material flow. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide an extruder discharge valve.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: an extruder discharge valve, comprising a valve body and a valve core rotatably mounted on the valve body. The valve body is provided with an inlet, an outlet, and a discharge port, wherein the inlet and outlet are respectively located on opposite side walls of the valve body, located on the same central axis, and the communication direction of the two is perpendicular to the installation direction of the valve core; the discharge port is located on the side wall of the valve body where the inlet and outlet are circumferentially connected. The valve core is provided with a through material flow channel that connects the inlet and outlet; the outer periphery of the valve core is also provided with a discharge groove whose length direction is the same as the direction of the material flow channel, so that when the valve core rotates, the inlet and discharge port can be connected.

[0005] The valve body is also equipped with a rotation limiting structure located on the side away from the power input end of the valve core. The rotation limiting structure is provided with a rotation limiting groove. Correspondingly, the valve core is equipped with a limiting component, and the outer periphery of the limiting component is provided with a limiting protrusion. The limiting protrusion is rotatably assembled into the aforementioned rotation limiting groove.

[0006] Furthermore, the valve body has a through-hole inner cavity, and the valve core is installed through the inner cavity and rotatably connected to the valve body via a seated bearing; a positioning sleeve is also coaxially fitted on the valve core and placed between the valve core and the valve body.

[0007] Furthermore, the discharge port is located at the bottom of the valve body, at a 90° right angle to the axis connecting the inlet and outlet, and its outer end is threaded to the discharge pipe.

[0008] Furthermore, the cross-section of the valve core feeding channel is an elongated slot shape.

[0009] Furthermore, the inlet and outlet of the valve body have the same structure and are arranged symmetrically; the inner ends of both the inlet and outlet are elongated slots that fit perfectly with the size of the port of the material flow channel; the outer cross-sections of both the inlet and outlet are circular, and a transition groove is provided between them and the inner ends; the transition grooves are arranged opposite each other and expand outwards in stages.

[0010] Furthermore, the discharge groove on the valve core is located on the outer wall of the valve core at a 90° position of its feeding channel, and its cross-section is semi-circular.

[0011] Furthermore, the rotation limiting structure is fixedly installed on the valve body by bolts, and a limiting component receiving hole is provided on it. A rotation limiting groove is provided below the limiting component receiving hole. The limiting component is coaxially fixed to the valve core by a key and placed in the limiting component receiving hole.

[0012] The two end walls of the aforementioned rotation limiting groove form a rotation limit on the upper limiting protrusion of the aforementioned limiting member, and the rotation angle of the limiting protrusion is 50° to 60°.

[0013] Furthermore, when the valve core feeding channel is connected to the inlet and outlet, the upper limit protrusion of the aforementioned limiting component abuts against one end wall of the rotating limiting groove; when the valve core rotates and drives the limiting protrusion to abut against the other end wall of the rotating limiting groove, the valve core upper discharge groove is connected to the inlet and discharge, and the valve core feeding channel is also connected to the discharge.

[0014] Furthermore, the valve body is also provided with a heating structure, which includes multiple electric heating plates, which are respectively fixedly installed on the outer periphery of the valve body.

[0015] Furthermore, it also includes a heating structure, which includes a heat medium flow channel disposed on the valve body and a heating guide sleeve disposed on the valve core; wherein the heat medium flow channel includes a heat medium inlet, an upper flow channel, a lower flow channel and a heat medium outflow channel, wherein both the upper flow channel and the lower flow channel are provided with two channels.

[0016] Two heating guide sleeves are provided, which are coaxially rotatably fitted onto the two ends of the valve core and placed on the inner end side of the positioning sleeve, with a sealing gasket between them; each heating guide sleeve has a heat medium guide groove circumferentially opened on the outer peripheral side wall of its end near the material flow channel.

[0017] One end of the aforementioned upper flow channel is connected to the heat medium inlet, and the other end is connected to the corresponding heat medium guide channel; one end of the aforementioned lower flow channel is connected to the corresponding heat medium guide channel, and the other end of both is connected to the heat medium outflow channel.

[0018] Compared with the prior art, the present invention has the following beneficial effects: The present invention has a simple structure and a dual-station flow channel. By changing the valve core angle, the working position and the discharge position can be switched, which facilitates the discharge of materials when replacing the filter screen, cleaning the flow channel or at the beginning of the start-up, ensuring the normal operation of the back-end maintenance work. At the same time, it can also ensure the flow of plastic melt at all times and avoid blockage caused by coking or hardening. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 for Figure 1 Right view of the middle structure;

[0021] Figure 3 for Figure 2 A cross-sectional view of the middle structure along its AA direction;

[0022] Figure 4 This is a schematic diagram of the valve body in this invention;

[0023] Figure 5 for Figure 4 Isometric side view of the middle valve body;

[0024] Figure 6 for Figure 4 Bottom axonometric view of the middle valve body;

[0025] Figure 7 This is a schematic diagram of the valve core structure in this invention;

[0026] Figure 8 for Figure 1 A bottom view of the middle structure;

[0027] Figure 9 for Figure 8 Cross-sectional view of the middle structure along its BB direction (working position);

[0028] Figure 10 This is a cross-sectional view along the BB direction when the material is in the discharge position.

[0029] Figure 11 This is a longitudinal center sectional view of the second heating structure assembled in this invention;

[0030] Figure 12 This is a schematic diagram of the valve core and the heating guide sleeve assembled on it in this invention;

[0031] In the diagram: the solid arrows indicate the direction of the molten material flow;

[0032] 1. Valve body, 2. Valve core, 3. Rotation limiting structure, 4. Limiting component, 5. Discharge pipe, 6. Bearing with seat, 7. Connecting hole, 8. Temperature sensor mounting hole, 9. Upper flow channel, 10. Lower flow channel, 11. Valve body cavity, 12. Inlet, 13. Outlet, 14. Discharge port, 15. Heat medium outflow channel, 21. Material flow channel, 22. Discharge groove, 23. Valve core body, 24. Positioning sleeve, 25. Heating guide sleeve, 26. Heat medium guide groove, 27. Sealing gasket, 31. Limiting component receiving hole, 32. Rotation limiting groove, 41. Limiting protrusion, 131. Inner end, 132. Transition groove, 133. Outer end. Detailed Implementation

[0033] It should be noted that in the description of this invention, terms such as "upper," "lower," "left," "right," "front," "rear," "inner," "outer," "coaxial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are only used to facilitate the description of the structural relationships of the components in this invention and do not specifically mean that any component in this invention must have a specific orientation, be constructed and operated in a specific orientation, or be construed as a limitation of this invention.

[0034] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0035] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings:

[0036] Example 1,

[0037] like Figure 1 As shown, an extruder discharge valve includes a valve body 1 and a valve core 2, combined with... Figures 4 to 6 As shown, the valve body 1 has a valve body cavity 11 extending through its front and rear. The valve core 2 is installed through the valve body cavity 11 and is rotatably connected to the valve body 1 by bearings 6 with seats at both ends. The valve core 2 is also coaxially fitted with positioning sleeves 24, which are installed into the valve body cavity 11 from both ends of the valve core 2. The positioning sleeves 24 are interference-fitted with the valve body 1 and rotatably fitted with the valve core 2 to limit the installation of the valve core 2 and ensure its rotational stability.

[0038] A feed inlet 12 is provided on the left side wall of the valve body 1, and a discharge outlet 13 is provided on the right side wall of the valve body 1. The feed inlet 12 and the discharge outlet 13 have the same structure, are located on the same central axis and are symmetrically arranged, and their communication direction is perpendicular to the installation direction of the valve core 2. A discharge outlet 14 is provided at the bottom of the valve body 1, located at a 90° right angle to the connecting axis of the feed inlet 12 and the discharge outlet 13, and is connected to the inner cavity 11 of the valve body. A discharge pipe 5 is threadedly connected to the external part of the discharge outlet 14. Figure 7 As shown, the valve core body 23 of the valve core 2 has a through material flow channel 21 with a cross-section in the shape of an elongated slot, which can connect the inlet 12 and the outlet 13 on the valve body 1; the bottom end of the valve core body 23 of the valve core 2 also has a discharge groove 22 with a semi-circular cross-section, which is located at a 90° right angle to the material flow channel 21, and its length direction is the same as the through direction of the material flow channel 21.

[0039] The above-mentioned inlet 12 and outlet 13 have the same structure, refer to Figure 5 As shown, taking the discharge port 13 as an example, its inner end 131 is a long slot-like structure, the size of which is adapted to the port size of the feed channel 21 of the valve core 2, and can be connected perfectly; the outer end 133 of the discharge port 13 has a circular cross-section, which is adapted to the diameter of the external connecting pipeline; a transition groove 132 is provided between the inner end 131 and the outer end 133, and there are two transition grooves 132, which are symmetrically arranged on the upper and lower sides of the discharge port 13. Each transition groove 132 expands smoothly from the inside to the outside, and can be divided into two stages of transition. The first stage near the inner end is spherical, and its inner edge is consistent with the arc of the end edge of the discharge groove 22; the adjacent second stage is conical fan-shaped, which can connect the first stage spherical surface with half of the circular surface of the outer end 133. The transition groove 132 can achieve the variable diameter setting of the inlet 12 and outlet 13 from the inside to the outside; and can also change the flow rate of the molten material through the variable diameter, thereby increasing the flow rate through the valve body 1.

[0040] Combination Figure 2 and Figure 3As shown, the front end of the valve core 2 is connected to the power source that drives its rotation; a rotation limiting structure 3 is fixedly installed on the rear end of the valve body 1 away from the driving end by bolts. A limiting member receiving hole 31 is opened at the center of the rotation limiting structure 3, and a rotation limiting groove 32 communicating with it is opened below the limiting member receiving hole 31. Correspondingly, an annular limiting member 4 is coaxially fixedly installed on the rear end of the valve core 2 by a key. A limiting protrusion 41 integrally formed with the limiting member 4 is fixedly installed on the outer periphery of the limiting member 4; the limiting member 4 is housed in the limiting member receiving hole 31, and the limiting protrusion 41 is housed in the rotation limiting groove 32. The two end walls of the rotation limiting groove 32 can block and limit the limiting protrusion 41. When the valve core 2 rotates, it drives the limiting protrusion 41 to swing within the rotation limiting groove 32.

[0041] Further optimized, the included angle between the two end walls of the aforementioned rotation limiting groove 32 is 50° to 60°, thereby limiting the swing angle of the aforementioned limiting protrusion 41. Based on actual usage requirements and considering the reserved thickness between the valve core 2 feeding channel 21 and the discharge groove 22, the optimal swing angle of the limiting protrusion 41 is limited to 56°.

[0042] The main materials of the valve body 1 and valve core 2 can be selected according to the properties of the materials in the applicable pipeline to achieve a rigid seal between them and to carry out anti-corrosion treatment to avoid corrosion. At the same time, multiple circumferentially arranged connecting holes 7 are opened on the outer walls of the inlet 12 and outlet 13 of the valve body 1 to facilitate connection with external pipelines by bolts.

[0043] The outer wall of the valve body 1 is also provided with a heating structure, which includes multiple electric heating plates. The multiple electric heating plates are fixedly installed on the upper, lower, left and right outer walls of the valve body 1 by bolts and are connected to an external electrical control cabinet through wiring. At the same time, a temperature sensor mounting hole 8 is also opened at the center of the top surface of the valve body 1. A corresponding temperature sensor can be inserted inside to cooperate with the electrical control cabinet to control the operation of the heating system and control its temperature range between 0 and 350°C. This is suitable for most materials and production environments, ensuring that the molten material entering the valve body 1 is always at a certain temperature and flows smoothly, avoiding the problem of molten material hardening or coking and then clogging the pipes and valves.

[0044] The specific operating principle is as follows: An extruder discharge valve is equipped with a dual-position flow channel. When the valve core 2's feeding flow channel 21 connects the aforementioned inlet 12 and outlet 13, the discharge valve is in the working position, such as... Figure 8 and Figure 9 As shown, the straight flow channel ensures that the material can flow smoothly to the downstream equipment during normal production; at this time, the limiting protrusion 41 on the limiting member 4, which is coaxially fixed with the valve core 2, abuts against one side end wall of the aforementioned rotating limiting groove 32.

[0045] When switching between production and shutdown states, a wrench is used to rotate the valve core 2 around its own axis, thereby causing the aforementioned limiting member 4 to rotate synchronously. The limiting protrusion 41 on the valve core 2 swings to abut against the other end wall of the rotation limiting groove 32. At this time, the discharge groove 22 on the valve core 2 makes the inlet 12 and the discharge outlet 14 inclinedly connected. Figure 10 As shown, at this time, the discharge end of the feed channel 21 of the valve core 2 is also connected to the discharge port 14. The remaining valve core body 23 structure and the valve body cavity 11 of the valve body 1 form a relative seal. The discharge valve is in the discharge position, and the molten material entering through the feed port 12 can be directly discharged. The molten material remaining in the feed channel 21 of the valve core 2 is also discharged to prevent it from accumulating inside and to avoid hardening and clogging the discharge valve.

[0046] Example 2,

[0047] An extruder discharge valve has the same main structure as the technical solution described in Embodiment 1 above. The difference lies in that the heating structure on the discharge valve includes a heat medium flow channel disposed within the valve body 1 and a heating guide sleeve 25 disposed on the valve core 2. Figure 11 As shown; the heat medium flow channel includes a heat medium inlet, an upper flow channel 9, a lower flow channel 10, and a heat medium outlet channel 15. The heat medium inlet is located on the top surface of the valve body 1. Both the upper flow channel 9 and the lower flow channel 10 have two sections, with the upper flow channel 9 arranged at an angle and its upper end connected to the aforementioned heat medium inlet. The heat medium outlet channel 15 is coaxially arranged around and spaced from the aforementioned discharge port 14, and its bottom end also has a heat medium outlet connecting to the outside. (Combined with...) Figure 12 As shown, two heating guide sleeves 25 are also provided, which are coaxially rotatably fitted onto the two ends of the valve core 2 and placed between the positioning sleeve 24 and the valve core body 23. The heating guide sleeve 25 is interference-fitted to the valve body 1, and a sealing gasket is added between the heating guide sleeve 25 and the positioning sleeve 24 to prevent the heat medium from overflowing. Each heating guide sleeve 25 has a heat medium guide groove 26 circumferentially formed on the outer peripheral side wall of its end near the material flow channel 21. The lower end of the upper flow channel 9 is connected to the heat medium guide groove 26 on the corresponding side of the heating guide sleeve 25. The upper end of the lower flow channel 10 is connected to the heat medium guide groove 26 on the corresponding side, and its lower end is connected to the heat medium outlet channel 15, which is discharged through the heat medium outlet and recycled.

[0048] The above-mentioned heat medium heating structure is suitable for occasions that require high-temperature heating or where the material is sensitive to electric heating. The heat medium is injected from the heat medium inlet, enters the heat medium guide groove 26 of the heating guide sleeve 25 after passing through the upper flow channel 9, and heats the molten material in the material flow channel 21 through heat transfer. Then it enters the heat medium outflow channel 15 through the lower flow channel 10 and is discharged through the heat medium outlet. The heat medium is circulated to achieve real-time heating.

[0049] The aforementioned extruder discharge valve plays an important role in various production lines due to its unique dual-station flow channel design, flexible configuration options (customers can choose configurations according to their actual needs, such as adding sensors, alarms and other accessories to improve the safety and reliability of the production line), and wide range of applications (it can be processed from φ20 to φ300, and matched according to the output or pipeline specifications).

[0050] Of course, the above description is not intended to limit the present invention, and the present invention is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A discharge valve for an extruder, characterized in that: The valve includes a valve body and a valve core rotatably mounted on the valve body. The valve body is provided with an inlet, an outlet, and a discharge port. The inlet and outlet are respectively located on opposite side walls of the valve body, on the same central axis, and their communication direction is perpendicular to the installation direction of the valve core. The discharge port is located on the side wall of the valve body where the inlet and outlet are circumferentially connected. The valve core is provided with a through material flow channel, which can connect the above-mentioned inlet and outlet; the outer periphery of the valve core is also provided with a discharge groove, the length direction of which is the same as the direction of the above-mentioned material flow channel, so that when the valve core is rotated, the inlet and the discharge port can be connected. The valve body is also equipped with a rotation limiting structure located on the side away from the power input end of the valve core. The rotation limiting structure is provided with a rotation limiting groove. Correspondingly, the valve core is equipped with a limiting component, and the outer periphery of the limiting component is provided with a limiting protrusion. The limiting protrusion is rotatably assembled into the aforementioned rotation limiting groove.

2. The extruder discharge valve according to claim 1, characterized in that: The valve body has a through-hole inner cavity, and the valve core is installed through the inner cavity and rotatably connected to the valve body through a seated bearing; a positioning sleeve is also coaxially fitted on the valve core and placed between the valve core and the valve body.

3. The extruder discharge valve according to claim 1, characterized in that: The discharge port is located at the bottom of the valve body, at a 90° right angle to the axis connecting the inlet and outlet, and its outer end is threaded to the discharge pipe.

4. The extruder discharge valve according to claim 1, characterized in that: The cross-section of the valve core feeding channel is a long slot.

5. The extruder discharge valve according to claim 4, characterized in that: The inlet and outlet of the valve body have the same structure and are arranged symmetrically. The inner ends of the inlet and outlet are both elongated slots that fit the size of the material flow channel. The outer cross-sections of the inlet and outlet are both circular, and a transition groove is provided between them and the inner ends. The transition grooves are arranged opposite each other and expand outward step by step.

6. The extruder discharge valve according to claim 1, characterized in that: The discharge groove on the valve core is located on the outer wall of the valve core at a 90° position of its feeding channel, and its cross-section is semi-circular.

7. The extruder discharge valve according to claim 2, characterized in that: The rotation limiting structure is fixedly installed on the valve body by bolts, and a limiting component receiving hole is opened on it. A rotation limiting groove is connected below the limiting component receiving hole; the limiting component is coaxially fixed to the valve core by a key and placed in the limiting component receiving hole. The two end walls of the aforementioned rotation limiting groove form a rotation limit on the upper limiting protrusion of the aforementioned limiting member, and the rotation angle of the limiting protrusion is 50° to 60°.

8. The extruder discharge valve according to claim 7, characterized in that: When the valve core feeding channel connects the inlet and outlet, the upper limit protrusion of the aforementioned limiting component abuts against one end wall of the rotating limiting groove; when the valve core rotates and drives the limiting protrusion to abut against the other end wall of the rotating limiting groove, the valve core discharge groove connects the inlet and outlet, and the valve core feeding channel connects with the discharge outlet.

9. The extruder discharge valve according to claim 1, characterized in that: The valve body is also provided with a heating structure, which includes multiple electric heating plates, which are respectively fixedly installed on the outer wall of the valve body.

10. An extruder discharge valve according to claim 2, characterized in that: It also includes a heating structure, which includes a heat medium flow channel disposed on the valve body and a heating guide sleeve disposed on the valve core; wherein the heat medium flow channel includes a heat medium inlet, an upper flow channel, a lower flow channel and a heat medium outflow channel, wherein both the upper flow channel and the lower flow channel are provided with two channels; Two heating guide sleeves are provided, which are coaxially rotatably fitted onto the two ends of the valve core and placed on the inner end side of the positioning sleeve, with a sealing gasket between them; each heating guide sleeve has a heat medium guide groove circumferentially opened on the outer peripheral side wall of its end near the material flow channel. One end of the aforementioned upper flow channel is connected to the heat medium inlet, and the other end is connected to the corresponding heat medium guide channel; one end of the aforementioned lower flow channel is connected to the corresponding heat medium guide channel, and the other end of both is connected to the heat medium outflow channel.

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