Vacuum sizing water jacket for plastic master film extrusion production line

Abstract

The utility model relates to a vacuum sizing water jacket for a plastic master film extrusion production line, which comprises a vacuum shell, a sizing sleeve arranged in the vacuum shell, a water ring sealing sleeve arranged on the outer side of the vacuum sizing sleeve in a surrounding manner, a cooling water inlet communicated with the water ring sealing sleeve, and a cooling inclined hole formed along the pipe wall of the sizing sleeve at a preset inclination angle, the vacuum suction port is formed in the vacuum shell, the cooling water outlet is formed in the bottom of the water ring sealing sleeve, the spraying pipeline is arranged on the shell, and the spraying pipeline comprises a folding part mounted on the inner side of the vacuum shell, a plurality of mounting plates linearly arrayed in the folding part and folding nozzles fixedly arranged on the mounting plates; the spraying pipeline is folded or unfolded through the folding piece, the folding piece is arranged in the shell in a contracted mode and can be unfolded according to insertion of the sizing sleeve, the multiple folding nozzles arranged in the folding piece are driven to incline, and the folding nozzles and the cooling inclined holes have the same inclination angle.

Description

Technical Field

[0001] This utility model relates to the technical field of molding equipment, and in particular to a vacuum sizing water jacket for a plastic mother film extrusion production line. Background Technology

[0002] In the extrusion molding process of plastic pipes, after the pipes are extruded from the extruder at high temperatures, they need to undergo sizing and cooling to ensure accurate outer diameter dimensions, smooth surface, and dense internal structure. Vacuum sizing water jackets, as an important component of the extrusion production line, typically use a negative pressure environment and cooling water film around the sizing sleeve to rapidly shape and cool the pipes.

[0003] Most existing vacuum sizing water jackets have cooling straight holes on the sizing sleeve to spray cooling water to cool the tube blank. However, because the cooling straight holes are perpendicular to the sizing sleeve wall, the tube blank is easily subjected to violent scouring contact with the cooling water flow during movement, resulting in damage or scratches on the tube blank surface, which in turn forms impurities, contaminates the cooling water, and affects the cooling efficiency and forming accuracy of subsequent sizing sleeves. In addition, traditional cooling spray structures are usually fixed and cannot be flexibly adjusted according to different tube specifications, which can easily lead to uneven cooling and reduce the consistency and forming quality of the finished tube. Utility Model Content

[0004] The purpose of this invention is to provide a vacuum sizing water jacket for a plastic masterbatch extrusion production line to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a vacuum sizing water jacket for a plastic master film extrusion production line, comprising: a vacuum shell, a sizing sleeve disposed in the vacuum shell, a water ring sealing sleeve surrounding the outside of the vacuum sizing sleeve, a cooling water inlet connected to the water ring sealing sleeve, cooling inclined holes disposed along the wall of the sizing sleeve at a preset inclination angle, a vacuum suction port disposed on the vacuum shell, a cooling water outlet disposed at the bottom of the water ring sealing sleeve, and a spray pipe disposed on the shell. The spray pipe includes a folding member installed inside the vacuum shell, multiple mounting plates linearly arrayed in the folding member, and folded nozzles fixedly disposed on the multiple mounting plates. The spray pipe is folded or unfolded by the folding member, which is retracted and disposed inside the shell. It can unfold according to the insertion of the sizing sleeve, causing the multiple folded nozzles disposed in the folding member to tilt, so that the folded nozzles have the same tilt angle as the cooling inclined holes.

[0006] Preferably, the sizing sleeve is further provided with a positioning element, which can drive the folding component to unfold with sizing sleeves of different diameters; the positioning element includes: a fixing plate, one side of which is fixedly connected to the sizing sleeve; a positioning frustum, which is fixedly connected to the other side of the fixing plate; a positioning through hole, which passes through the fixing plate and the positioning frustum and is coaxially connected to the inner cavity of the sizing sleeve; a positioning sleeve, which is sleeved on the outside of the positioning frustum, the inner cavity of the positioning sleeve having the same diameter as the inner cavity of the sizing sleeve, and the positioning is achieved by engaging the inner inclined surface of the positioning frustum with the inclined surface of the positioning sleeve; and a connecting rod, one end of which is rotatably connected to the end of the folding component by a hinge, and the other end of which is connected to the positioning sleeve, the insertion force of the sizing sleeve pushes the positioning sleeve outward, driving the folding component to unfold synchronously.

[0007] Preferably, a vertical nozzle is provided inside the vacuum housing, and the spray direction of the vertical nozzle is perpendicular to the axial direction of the sizing sleeve to cool the front end of the inclined spray section.

[0008] Preferably, the vertical nozzle is further provided with a lifting rod.

[0009] Preferably, the folding component includes: a mounting block fixedly disposed inside the vacuum housing; a sliding track vertically formed on the mounting block; a connecting rod assembly, one end of which is hinged to the mounting block and the other end of which is rotatably connected to the connecting rod; a sliding rod disposed within the sliding track and abutting against the end of the connecting rod assembly; and a compression spring sleeved on the sliding rod, one end of which abuts against the mounting block and the other end of which abuts against the sliding rod.

[0010] Preferably, the vacuum shell is provided with an observation hole for observing the spraying of the tube blank.

[0011] The beneficial effects of this utility model are:

[0012] This invention features a foldable and expandable spray pipe. The spray pipe automatically expands or contracts based on the insertion force, ensuring uniform cooling spray and saving internal space. To further enhance cooling efficiency and molding stability, vertical nozzles are used for targeted cooling of the tube blank's front end, and a lifting rod adapts to different tube diameters. This allows the entire cooling system to improve efficiency while also flexibly adapting to diverse production needs.

[0013] To prevent surface damage and impurity shedding during tube blank movement, inclined cooling holes were designed along the sizing sleeve. This design prevents damage to the tube blank surface and impurity shedding during tube blank movement, ensuring the cleanliness of the cooling water and avoiding scratches or irregularities on the tube surface. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a three-dimensional schematic diagram of a vacuum sizing water jacket for a plastic master film extrusion production line according to an embodiment of the present invention.

[0016] Figure 2 This is a cross-sectional view of the overall structure of a vacuum sizing water jacket for a plastic master film extrusion production line according to an embodiment of the present invention.

[0017] Figure 3 This invention relates to a vacuum sizing water jacket for a plastic masterbatch extrusion production line. Figure 2 Schematic diagram of cross-section at point B in the middle;

[0018] Figure 4 This invention relates to a vacuum sizing water jacket for a plastic masterbatch extrusion production line. Figure 2 Enlarged schematic diagram of the structure at point A in the middle.

[0019] Figure 5 This is a schematic diagram of the positioning component of a vacuum sizing water jacket used in a plastic master film extrusion production line, according to an embodiment of the present invention.

[0020] Figure 6 This is a schematic diagram of the positioning component of a vacuum sizing water jacket used in a plastic master film extrusion production line, according to an embodiment of the present invention.

[0021] The components are marked as follows: vacuum shell (100), sizing sleeve (101), water ring sealing sleeve (102), cooling water inlet (103), cooling inclined hole (104), vacuum suction port (105), cooling water outlet (106), spray pipe (107), folding part (107a), mounting block (107a-1), sliding rail (107a-2), connecting rod group (107a-3), sliding rod (107a-4), compression spring (107a-5), mounting plate (107b), folding nozzle (107c), positioning part (108), fixing plate (108a), positioning frustum (108b), positioning through hole (108c), positioning sleeve (108d), connecting rod (108e), vertical nozzle (109), lifting rod (110), and observation hole (111). Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments.

[0023] It should be noted that, unless otherwise defined, the technical or scientific terms used in this utility model should have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar words used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0024] like Figures 1 to 6 As shown in the specific embodiment of this utility model, a vacuum sizing water jacket for a plastic master film extrusion production line is provided, including a vacuum shell 100, and a sizing sleeve 101 disposed inside the vacuum shell 100. A water ring sealing sleeve 102 is disposed around the outer periphery of the sizing sleeve 101 to form a stable water film between the sizing sleeve 101 and the pipe, thereby assisting in the sizing and cooling of the plastic pipe. The water ring sealing sleeve 102 is connected to a cooling water inlet 103, through which cooling water is continuously introduced to maintain and circulate the water film. Multiple cooling inclined holes 104 are opened along the pipe wall of the sizing sleeve 101, and the cooling inclined holes 104 are arranged at a preset inclination angle. A vacuum suction port 105 is provided on the vacuum shell 100 to extract air from the inside of the sizing water jacket, forming a negative pressure environment, further accelerating the sizing and forming speed of the plastic pipe and optimizing the surface quality. The bottom of the water ring sealing sleeve 102 is provided with a cooling water outlet 106 for discharging the circulating cooling water, maintaining stable flow and clean water quality in the cooling system. The vacuum housing 100 also includes a spray pipe 107, which comprises a folding member 107a installed inside the vacuum housing 100, multiple mounting plates 107b linearly arrayed and fixed to the folding member 107a, and multiple folded nozzles 107c respectively mounted on each mounting plate 107b. The spray pipe 107 can be folded or unfolded via the folding member 107a: when not in use, the folding member 107a retracts inside the housing, not affecting normal operation; when the sizing sleeve 101 is inserted, the folding member 107a unfolds under force, causing the multiple folded nozzles 107c to open synchronously, and causing the nozzles to spray cooling water in the same inclined direction as the cooling inclined hole 104, achieving precise and uniform cooling of the pipe.

[0025] The sizing sleeve 101 is also provided with a positioning element 108 for driving the unfolding of the folding component 107a, so as to adapt to sizing sleeves 101 of different diameters, so that they can all drive the folding component 107a to unfold smoothly. In this embodiment, the positioning element 108 includes a fixing plate 108a, one side of which is fixedly connected to the sizing sleeve 101, and the other side is fixedly connected to a positioning frustum 108b. A positioning through hole 108c is provided through the positioning frustum 108b, and the positioning through hole 108c is coaxially connected to the inner cavity of the sizing sleeve 101 to ensure the consistency and stability of the insertion force direction. A positioning sleeve 108d is sleeved on the outside of the positioning frustum 108b. The inner diameter of the positioning sleeve 108d is the same as the inner diameter of the sizing sleeve 101, and its inner inclined surface engages with the outer inclined surface of the positioning frustum 108b to form a reliable positioning connection. A connecting rod 108e is provided between the positioning sleeve 108d and the folding member 107a. One end of the connecting rod 108e is rotatably connected to the end of the folding member 107a by a hinge, and the other end is fixedly connected to the positioning sleeve 108d. When the insertion force of the sizing sleeve 101 is applied, the positioning sleeve 108d is pushed along the direction of the insertion force, which in turn drives the folding member 107a to unfold synchronously through the connecting rod 108e, so that multiple folding nozzles 107c can open synchronously and spray cooling water in the same inclined direction as the cooling inclined hole 104.

[0026] A vertical nozzle 109 is provided inside the vacuum housing 100. The vertical nozzle 109 sprays in a direction perpendicular to the axial direction of the sizing sleeve 101 to cool the front end of the inclined spray section. This reduces the initial temperature of the pipe surface, improves the shaping quality of the pipe surface, and increases the overall yield.

[0027] A lifting rod 110 is also provided on the vertical nozzle 109. It is used to adjust the height of the nozzle according to the sizing sleeve 101 of different diameters to ensure uniformity of spray cooling.

[0028] The folding component 107a includes: a mounting block 107a-1, fixedly disposed inside the vacuum housing 100; a sliding track 107a-2, vertically opened on the mounting block 107a-1; a connecting rod assembly 107a-3, one end of which is hinged to the mounting block 107a-1 and the other end is rotatably connected to the previous connecting rod 108e; a sliding rod 107a-4, disposed inside the sliding track 107a-2 and abutting against the end of the connecting rod assembly 107a-3; and a compression spring 107a-5, sleeved on the sliding rod 107a-4, one end of which abuts against the mounting block 107a-1 and the other end of which abuts against the sliding rod 107a-4. When no external force is applied, the compression spring 107a-5 keeps the connecting rod assembly 107a-3 in a compact folded state; when the end of the sizing sleeve 101 pushes the connecting rod assembly 107a-3, the connecting rod assembly 107a-3 slides along the sliding track 107a-2 against the spring force and automatically unfolds, realizing the deployment and angle adjustment of the spray pipe 107.

[0029] An observation hole 111 is provided on the vacuum shell 100 for observing the spraying of the tube blank.

[0030] Working Principle: A water ring sealing sleeve 102, located around the outer periphery of the sizing sleeve 101, continuously supplies water through the cooling water inlet 103, forming a stable water film that adheres tightly to the outer surface of the tube blank, assisting in the initial sizing and cooling of the tube. The vacuum suction port 105 continuously pumps air, maintaining negative pressure inside the vacuum shell 100, ensuring the plastic tube adheres tightly to the inner wall of the sizing sleeve 101, improving sizing accuracy and surface quality. Cooling oblique holes 104, opened along the tube wall of the sizing sleeve 101, are arranged at a preset angle, unlike traditional straight holes. This oblique hole design prevents direct collision between the tube blank and the cooling water spray point during movement, reducing damage to the outer surface of the tube blank, preventing impurities from contaminating the cooling water, thus keeping the cooling system clean and improving the surface quality of the formed tube. The positioning element 108 on the sizing sleeve 101, in conjunction with the insertion force, drives the folding element 107a to unfold, causing multiple folding nozzles 107c to open simultaneously. The folded nozzle 107c, with the same tilt angle as the cooling oblique hole 104, precisely targets the outer surface of the pipe for cooling spray, ensuring effective cooling without damaging the pipe surface. When not in use, the folding part 107a automatically retracts to a compact state under the action of the compression spring 107a-5, saving space. At the front end of the sizing sleeve 101, a vertical nozzle 109 is located inside the vacuum housing 100, with its spray direction perpendicular to the pipe axis, rapidly cooling the front end of the pipe blank entering the sizing section. The vertical nozzle 109 is also equipped with a lifting rod 110, which can adjust the nozzle height according to the sizing sleeve 101 of different diameters to ensure uniform spraying of pipes of different specifications.

[0031] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples; within the framework of the present invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of the present invention as described above, which are not provided in the details for the sake of brevity.

[0032] This utility model is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A vacuum sizing water jacket for a plastic master film extrusion production line, comprising: a vacuum housing (100); a sizing sleeve (101) disposed in the vacuum housing (100); a water ring sealing sleeve (102) surrounding the outside of the sizing sleeve (101); a cooling water inlet (103) communicating with the water ring sealing sleeve (102); a cooling oblique hole (104) disposed at a preset inclination angle along the wall of the sizing sleeve (101); a vacuum suction port (105) disposed on the vacuum housing (100); a cooling water outlet (106) disposed at the bottom of the water ring sealing sleeve (102); and a spray pipe (107) disposed on the vacuum housing (100), characterized in that: The spray pipe (107) includes a folding member (107a) installed inside the vacuum housing (100), a plurality of mounting plates (107b) linearly arrayed in the folding member (107a), and folding nozzles (107c) fixedly disposed on the plurality of mounting plates (107b). The spray pipe (107) is folded or unfolded by a folding member (107a). The folding member (107a) is retracted and disposed inside the vacuum housing (100). It can be unfolded according to the insertion of the sizing sleeve (101), which causes multiple folding nozzles (107c) disposed in the folding member (107a) to tilt, so that the folding nozzles (107c) have the same tilt angle as the cooling inclined hole (104).

2. The vacuum sizing water jacket for a plastic masterbatch extrusion production line according to claim 1, characterized in that, The sizing sleeve (101) is also provided with a positioning element (108), which can drive the folding element (107a) to unfold for sizing sleeves (101) of different diameters; the positioning element (108) includes: A fixing plate (108a) is fixedly connected to the sizing sleeve (101) on one side; The positioning frustum (108b) is fixedly connected to the other side of the fixing plate (108a); The positioning through hole (108c) penetrates the fixing plate (108a) and the positioning frustum (108b), and is coaxially connected with the inner cavity of the sizing sleeve (101). A positioning sleeve (108d) is fitted on the outside of the positioning frustum (108b). The inner diameter of the positioning sleeve (108d) is the same as that of the inner diameter of the sizing sleeve (101). Positioning is achieved by engaging the inner inclined surface of the positioning sleeve (108b) with the inclined surface of the positioning frustum (108b). The connecting rod (108e) has one end hinged to the end of the folding piece (107a) and the other end connected to the positioning sleeve (108d). The insertion force of the sizing sleeve (101) pushes the positioning sleeve (108d) outward, driving the folding piece (107a) to unfold synchronously.

3. The vacuum sizing water jacket for a plastic masterbatch extrusion production line according to claim 2, characterized in that, A vertical nozzle (109) is provided on the inner side of the vacuum housing (100).

4. The vacuum sizing water jacket for a plastic masterbatch extrusion production line according to claim 3, characterized in that, The vertical nozzle (109) is also equipped with a lifting rod (110).

5. The vacuum sizing water jacket for a plastic masterbatch extrusion production line according to claim 2, characterized in that, The folding component (107a) includes a mounting block (107a-1) which is fixedly disposed inside the vacuum housing (100); A sliding track (107a-2) is vertically opened on the mounting block (107a-1); The connecting rod assembly (107a-3) has one end hinged to the mounting block (107a-1) and the other end rotatably connected to the connecting rod (108e); The sliding rod (107a-4) is located within the sliding track (107a-2) and abuts against the end of the connecting rod assembly (107a-3); A compression spring (107a-5) is sleeved on the sliding rod (107a-4), with one end abutting against the mounting block (107a-1) and the other end abutting against the sliding rod (107a-4).

6. The vacuum sizing water jacket for a plastic masterbatch extrusion production line according to claim 1, characterized in that, The vacuum housing (100) is provided with an observation hole (111) for observing the spraying of the tube blank.

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