Deslagging screw and deslagging device

Abstract

The utility model relates to the technical field of plastic processing equipment, in particular to a deslagging screw rod and a deslagging device.The deslagging screw rod comprises a rod body provided with a deslagging section, the deslagging section comprises a first spiral structure and a second spiral structure which are sequentially arranged on the periphery of the rod body, the first spiral structure generates first acting force on melt and impurities, and the second spiral structure generates second acting force on the melt and the impurities. The second spiral structure generates second acting force on the melt and the impurities, the direction of the first acting force is the same as the flowing direction of the melt, the direction of the second acting force is opposite to the flowing direction of the melt, and the first acting force is larger than the second acting force; the deslagging device comprises a material barrel, a motor and the deslagging screw rod, the deslagging screw rod is connected to the output end of the motor, and the periphery of the deslagging screw rod is sleeved with the material barrel. Through the design of the first spiral structure, impurities filtered from plastics are effectively, quickly and effectively discharged, and through the arrangement of the second spiral structure, the impurities are extruded and refined, so that the discharge loss of normal materials is effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of plastic processing equipment, and more specifically, to a slag discharge screw and a slag discharge device. Background Art

[0002] During the plastic extrusion process, the plastic melt undergoes prolonged plasticization and heating, producing decomposition residues within the melt. Combined with impurities in the raw materials, these residues, once entering the extruder head, can block the flow path, cause defects in the plastic product, and even prevent normal production. To filter out these impurities and ensure the pure melt enters the extruder head smoothly, a filter is typically placed between the screw head and the extruder head to prevent impurities and foreign matter from entering the extruder head. However, as filtration time increases, impurities accumulate on the filter surface, affecting the filter's efficiency. Manually cleaning the impurities requires downtime, impacting the equipment's production efficiency. Consequently, self-cleaning filters capable of automatic cleaning have begun to be used. Current self-cleaning filters generally use a hydraulic slag discharge mechanism for slag removal. However, this hydraulic slag discharge mechanism has a high slag discharge rate, low actual product recovery efficiency, and high production losses. Utility Model Content

[0003] The purpose of the utility model is to overcome the shortcomings of the prior art in that the slag discharge rate is high, the product recovery rate is low, and the production loss is high, and to provide a slag discharge screw and a slag discharge device with a low slag discharge rate, a high product recovery rate, and low production loss.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0005] A slag discharge screw is provided, comprising a rod body provided with a slag discharge section, wherein the slag discharge section comprises a first spiral structure and a second spiral structure sequentially arranged on the outer periphery of the rod body, the first spiral structure generates a first force on the melt and impurities, and the second spiral structure generates a second force on the melt and impurities, the direction of the first force is the same as the direction of melt flow, the direction of the second force is opposite to the direction of melt flow, and the first force is greater than the second force.

[0006] The slag discharge screw of the present invention has a first spiral structure that generates a first force on the melt and impurities in the same direction as the melt flow within the slag discharge screw, while a second spiral structure generates a second force on the melt and impurities in the opposite direction of the melt flow within the slag discharge screw, with the first force being greater than the second force. Under the action of the first force, the melt moves forward, while under the action of the second force, the forward thrust on the melt is reduced, the melt flow rate is reduced, the melt residence time is increased, the cavity pressure is stabilized, and the melt is difficult to be discharged, thereby reducing the slag discharge rate, improving product recovery efficiency, reducing product loss, and increasing production revenue.

[0007] Furthermore, the first helical structure is a forward-directed helical structure that propels the melt forward, while the second helical structure is a reverse-directed helical structure that prevents the melt from advancing. A first polished rod segment is located between the end of the forward helical structure and the beginning of the reverse-directed helical structure. While the forward helical structure promotes forward motion of the melt, the first polished rod segment increases melt retention and reduces forward thrust. The reverse-directed helical structure squeezes and refines impurities, reducing the melt's flow rate while stabilizing the pressure within the cavity, making it less likely for the melt to be discharged.

[0008] Furthermore, the length of the second helical structure along the axial direction of the rod body is greater than the length of the first polished rod segment along the axial direction of the rod body. The length of the second helical structure along the axial direction of the rod body is slightly greater than the length of the first polished rod segment along the axial direction of the rod body, so that the second helical structure has a more prominent role in stabilizing the pressure in the cavity, thereby minimizing the discharge of the melt along with impurities.

[0009] Furthermore, the length of the first helical structure along the axial direction of the rod body is greater than the sum of the lengths of the second helical structure and the first polished rod segment along the axial direction of the rod body. The second helical structure and the first polished rod segment both act to hinder the forward movement of the melt. By designing the length of the first helical structure, the melt is always subjected to a forward thrust of varying magnitude, thereby achieving continuous operation.

[0010] Furthermore, the rod body is further provided with a feeding section, wherein the feeding section and the slag discharge section are sequentially arranged along the melt flow direction in the slag discharge screw. Setting up a dedicated feeding section for feeding makes the slag discharge rate easier to control than feeding directly from the slag discharge section.

[0011] Furthermore, the feed section includes a third helical structure and a second polished rod section located between the end of the third helical structure and the starting end of the first helical structure. The third helical structure exerts a third force on the melt and impurities in the same direction as the melt flow within the slag discharge screw. The third helical structure can transport impurities in the melt from the feed section to the slag discharge section. The second polished rod section can reduce the flow rate of the melt. In the second polished rod section, the melt squeezes the impurities, causing them to move forward to the slag discharge section.

[0012] Furthermore, the length of the second polished rod segment along the rod body's axis is equal to the length of the first helical structure along the rod body's axis. The first helical structure is a forward-directed double helical structure that propels the melt forward. The forward-directed double helical structure can quickly and effectively direct impurities in the melt into the slag discharge section. The size design of the second polished rod segment reduces the melt's flow rate, ensuring that as many impurities as possible enter the slag discharge section.

[0013] Furthermore, the invention also includes a discharge section, wherein the feed section, the slag discharge section, and the discharge section are sequentially arranged along the melt flow direction in the slag discharge screw. Compared with discharging directly from the slag discharge section, the dedicated discharge section can further reduce the melt being discharged along with impurities, thereby further reducing the slag discharge rate.

[0014] Furthermore, the discharge section includes a sealing thread at the end of the rod body and a third polished rod section located between the end of the second spiral structure and the starting point of the sealing thread. The sealing thread provides a protective seal, preventing the melt from entering and damaging adjacent components of the slag discharge screw. The design of the third polished rod section further reduces the flow rate of the melt, squeezing out as many impurities as possible.

[0015] The utility model also provides a slag discharge device, comprising a barrel, a motor and the above-mentioned slag discharge screw, wherein the slag discharge screw is connected to the output end of the motor, and the barrel is sleeved on the outer periphery of the slag discharge screw.

[0016] In this utility model, a motor drives the slag discharge screw to rotate, thereby pushing the melt and impurities forward within the gap between the slag discharge screw and the barrel. Under the action of a first force, the melt moves forward, while under the action of a second force, the forward thrust on the melt is reduced, reducing the melt's flow rate, increasing the melt's residence time, and stabilizing the cavity pressure, making it less likely to be discharged. This reduces the slag discharge rate, improves product recovery efficiency, reduces product loss, and increases production revenue.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] The slag discharge screw and slag discharge device of the present invention can effectively and quickly discharge impurities filtered by plastic through the design of the first spiral structure and the third spiral structure, and can extrude and refine impurities through the arrangement of the second spiral structure, the first polished rod segment, the second polished rod segment and the third polished rod segment, thereby effectively reducing the discharge loss of normal materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the structure of the slag discharge screw in Example 1;

[0020] Figure 2 Schematic diagram of the structure of the slag discharge screw in Example 2;

[0021] Figure 3 This is a schematic structural diagram of the slag discharge screw in Example 3 from a first perspective;

[0022] Figure 4 This is a structural diagram of the slag discharge screw in Example 3 from another perspective;

[0023] In the accompanying drawings: 100, slag discharge section; 110, first spiral structure; 120, second spiral structure; 130, first polished rod section; 200, feed section; 210, third spiral structure; 220, second polished rod section; 300, discharge section; 310, sealing thread; 320, third polished rod section. DETAILED DESCRIPTION

[0024] The present invention is further described below in conjunction with specific embodiments. The accompanying drawings are for illustrative purposes only and are schematic, not actual, representations. They should not be construed as limiting this patent. To better illustrate the embodiments of the present invention, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted from the drawings.

[0025] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right" and so on indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings. This is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0026] Example 1

[0027] This embodiment is the first embodiment of the slag discharge screw, comprising a rod body provided with a slag discharge section 100, wherein the slag discharge section 100 comprises a first spiral structure 110 and a second spiral structure 120 sequentially arranged on the outer periphery of the rod body, wherein the first spiral structure 110 generates a first force on the melt and impurities, and the second spiral structure 120 generates a second force on the melt and impurities, wherein the direction of the first force is the same as the direction of melt flow in the slag discharge screw, and the direction of the second force is opposite to the direction of melt flow in the slag discharge screw, and the first force is greater than the second force, as shown in FIG. Figure 1 shown.

[0028] During the implementation of this embodiment, the slag discharge screw rotates around its own axis, and impurities gather toward the center under the action of centripetal force, and a small amount of melt follows a large amount of impurities into the slag discharge section 100; the first spiral structure 110 generates a first force on the melt and impurities in the same direction as the melt flow in the slag discharge screw, and the second spiral structure 120 generates a second force on the melt and impurities in the opposite direction of the melt flow in the slag discharge screw, and the first force is greater than the second force. Under the action of the first force, the melt and impurities move forward, while under the action of the second force, the forward thrust on the melt is reduced, the flow rate of the melt is reduced, the residence time of the melt is increased, the cavity pressure is stabilized, and the melt is not easily discharged, thereby reducing the slag discharge rate, improving the product recovery efficiency, reducing product loss, and increasing production revenue.

[0029] Among them, the first spiral structure 110 is a forward spiral structure that can propel the melt forward, and the second spiral structure 120 is a reverse spiral structure that can prevent the melt from advancing. A first polished rod segment 130 is provided between the end of the forward spiral structure and the beginning of the reverse spiral structure. When this embodiment is implemented, the forward spiral structure provides the melt with the effect of moving forward, and the first polished rod segment 130 can increase the melt's retention and reduce the melt's forward thrust. The reverse spiral structure extrude and refine impurities, reducing the melt flow rate, while stabilizing the pressure in the cavity, making it difficult for the melt to be discharged. Specifically, in this embodiment, the length of the second spiral structure 120 along the axial direction of the rod body is greater than the length of the first polished rod segment 130 along the axial direction of the rod body, and the length of the first spiral structure 110 along the axial direction of the rod body is greater than the sum of the lengths of the second spiral structure 120 and the first polished rod segment 130 along the axial direction of the rod body. The length of the second spiral structure 120 along the axial direction of the rod body is slightly greater than the length of the first light rod segment 130 along the axial direction of the rod body, so that the role of the second spiral structure 120 in stabilizing the pressure in the cavity is more prominent, thereby avoiding the melt from being discharged along with impurities as much as possible; the second spiral structure 120 and the first light rod segment 130 both play a role in hindering the forward movement of the melt. Through the length design of the first spiral structure 110, the melt is always subjected to a forward thrust that is larger or smaller, thereby achieving continuous operation.

[0030] In addition, the spiral diameters and pitches of the forward and reverse spiral structures in this embodiment are equal, and the inclination angles of the forward and reverse spiral structures are opposite and equal in magnitude. This arrangement facilitates processing. The forward spiral structure includes a plurality of forward spirals, and the reverse spiral structure also includes a plurality of reverse spirals. The number of forward spiral structures is greater than the number of reverse spiral structures. In this embodiment, the forward spiral structure near the first polished rod segment 130 is not a complete forward spiral. The axial length of the first polished rod segment 130 is slightly less than the pitch. The combination of the incomplete forward spiral and the first polished rod segment 130 has a positive effect on reducing the melt velocity and melt discharge rate.

[0031] Example 2

[0032] This embodiment is the second embodiment of a deslagging screw. This embodiment is similar to the first embodiment, except that the screw body is further provided with a feed section 200. The feed section 200 and the deslagging section 100 are sequentially arranged along the melt flow direction within the deslagging screw. The dedicated feed section 200 allows for easier control of the deslagging rate compared to direct feeding from the deslagging section 100.

[0033] In this embodiment, the feeding section 200 includes a third spiral structure 210 and a second polished rod section 220 provided between the end of the third spiral structure 210 and the starting end of the first spiral structure 110. The third spiral structure 210 generates a third force on the melt and impurities in the same direction as the melt flow in the slag discharge screw. Figure 2 When this embodiment is implemented, the third spiral structure 210 can transport impurities in the melt from the feed section 200 to the slag discharge section 100. The second polished rod section 220 can reduce the flow rate of the melt. In the second polished rod section 220, the melt is used to squeeze the impurities, causing them to move forward to the slag discharge section 100.

[0034] The movement of the melt and impurities mainly depends on the forces of the first spiral structure 110, the second spiral structure 120 and the third spiral structure 210, wherein the forces of the first spiral structure 110 and the third spiral structure 210 have the same direction, and the force of the second spiral structure 120 is opposite to that of the first spiral structure 110. To ensure smooth discharge of impurities, in this embodiment, the sum of the first force and the third force should be greater than the second force.

[0035] Specifically, in this embodiment, the axial length of the second polished rod segment 220 is equal to the axial length of the first helical structure 110. The first helical structure 110 is a forward-directed double helical structure that propels the melt forward. This forward-directed double helical structure quickly and efficiently allows impurities in the melt to enter the slag discharge section 100. The dimensional design of the second polished rod segment 220 reduces the melt flow rate, ensuring that as many impurities as possible enter the slag discharge section 100.

[0036] In addition, since the forward double helix structure can generate a large forward thrust on the melt and impurities, if the flow of impurities and melt is not blocked, the melt will be discharged together with the impurities; before the first polished rod segment 130 of the slag discharge section 100, the flow of the melt has been blocked by the second polished rod segment 220, and the melt content passing through the first polished rod segment 130 is lower than the melt content passing through the second polished rod segment 220. Therefore, in this embodiment, the length of the second polished rod segment 220 along the axial direction of the rod body is designed to be greater than the length of the first polished rod segment 130 along the axial direction of the rod body.

[0037] Example 3

[0038] This embodiment is the third embodiment of a slag discharge screw. This embodiment is similar to the second embodiment, except that it further includes a discharge section 300. The feed section 200, the slag discharge section 100, and the discharge section 300 are sequentially arranged along the direction of melt flow within the slag discharge screw. The provision of a dedicated discharge section 300 can further reduce the amount of melt discharged along with impurities, compared to discharging directly from the slag discharge section 100, thereby further reducing the slag discharge rate.

[0039] Specifically, in this embodiment, the discharge section 300 includes a sealing thread 310 provided at the end of the rod body and a third polished rod section 320 provided between the end of the second spiral structure 120 and the starting end of the sealing thread 310. The sealing thread 310 plays a sealing and protective role, preventing the melt from entering the adjacent structural components of the slag discharge screw and causing damage thereto. The design of the third polished rod section 320 can further reduce the flow rate of the melt and squeeze out as many impurities as possible. Figure 3 、 Figure 4 shown.

[0040] Example 4

[0041] This embodiment is an embodiment of a slag discharge device, comprising a barrel, a motor, and a slag discharge screw as described in any one of Embodiments 1 to 3. The slag discharge screw is connected to the output end of the motor, and the barrel is sleeved around the outer periphery of the slag discharge screw. Specifically, in this embodiment, the barrel is provided with a feed port and a discharge port. The position of the feed port corresponds to the position of the third spiral structure 210, and the position of the discharge port corresponds to the position of the third polished rod segment 320.

[0042] In this utility model, a motor drives the slag discharge screw to rotate, thereby pushing the melt and impurities forward within the gap between the slag discharge screw and the barrel. Under the action of a first force, the melt moves forward, while under the action of a second force, the forward thrust on the melt is reduced, reducing the melt's flow rate, increasing the melt's residence time, and stabilizing the cavity pressure, making it less likely to be discharged. This reduces the slag discharge rate, improves product recovery efficiency, reduces product loss, and increases production revenue.

[0043] In the specific contents of the above-mentioned specific implementation methods, the various technical features can be combined in any non-contradictory manner. In order to make the description concise, not all possible combinations of the above-mentioned technical features are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0044] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. A person skilled in the art will be able to make other variations or modifications based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A slag discharge screw, characterized in that: The invention comprises a rod body provided with a slag discharge section (100), wherein the slag discharge section (100) comprises a first spiral structure (110) and a second spiral structure (120) sequentially arranged on the outer periphery of the rod body, wherein the first spiral structure (110) generates a first force on the melt and impurities, and the second spiral structure (120) generates a second force on the melt and impurities, wherein the direction of the first force is the same as the direction of melt flow, and the direction of the second force is opposite to the direction of melt flow, and the first force is greater than the second force.

2. The slag discharge screw according to claim 1, characterized in that: The first spiral structure (110) is a forward spiral structure that can push the melt forward, and the second spiral structure (120) is a reverse spiral structure that can prevent the melt from moving forward. A first light rod section (130) is provided between the end of the forward spiral structure and the beginning of the reverse spiral structure.

3. The slag discharge screw according to claim 2, characterized in that: The length of the second helical structure (120) along the axial direction of the rod body is greater than the length of the first polished rod segment (130) along the axial direction of the rod body.

4. The slag discharge screw according to claim 2, characterized in that: The length of the first helical structure (110) along the axial direction of the rod body is greater than the sum of the lengths of the second helical structure (120) and the first polished rod segment (130) along the axial direction of the rod body.

5. The slag discharge screw according to any one of claims 2 to 4, characterized in that: The rod body is further provided with a feeding section (200), and the feeding section (200) and the slag discharge section (100) are sequentially arranged along the melt flow direction.

6. The slag discharge screw according to claim 5, characterized in that: The feeding section (200) includes a third spiral structure (210) and a second polished rod section (220) arranged between the end of the third spiral structure (210) and the starting end of the first spiral structure (110), and the third spiral structure (210) generates a third force on the melt and impurities in the same direction as the melt flow direction.

7. The slag discharge screw according to claim 6, characterized in that: The length of the second polished rod section (220) along the axial direction of the rod body is equal to the length of the first helical structure (110) along the axial direction of the rod body, and the first helical structure (110) is a forward double helical structure that pushes the melt forward.

8. The slag discharge screw according to claim 5, characterized in that: It also includes a discharge section (300), wherein the feed section (200), the slag discharge section (100), and the discharge section (300) are sequentially arranged along the melt flow direction.

9. The slag discharge screw according to claim 8, characterized in that: The discharge section (300) comprises a sealing thread (310) provided at the end of the rod body and a third polished rod section (320) provided between the end of the second spiral structure (120) and the starting end of the sealing thread (310).

10. A slag discharge device, characterized in that: It comprises a barrel, a motor and a slag discharge screw according to any one of claims 1 to 9, wherein the slag discharge screw is connected to the output end of the motor, and the barrel is sleeved on the outer periphery of the slag discharge screw.

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