CN218985457U - Sizing tube assembly for MPP power tube - Google Patents

Abstract

The utility model relates to a sizing tube assembly for an MPP power tube, which comprises a sizing tube, a sizing tube and a sizing tube, wherein the sizing tube is limited with an axial lead extending forwards and backwards and a sizing cavity for the MPP power tube to pass through from front to back, and is provided with a vacuum groove which is in fluid communication with the sizing cavity and is connected with a vacuum device and at least one cooling groove which is positioned on the inner wall surface and is in fluid communication with the vacuum groove; the water ring is fixedly arranged on the outer side of the sizing pipe, a plurality of first cooling water gaps for cooling water to flow into the sizing pipe assembly are formed in the water ring, and the plurality of first cooling water gaps, the at least one cooling groove and the vacuum groove are sequentially in fluid communication; the water ring cover is fixedly arranged on the front side of the water ring and is limited with a pre-cooling cavity positioned on the front side of the sizing cavity, the water ring or the water ring cover is limited with a plurality of second cooling water ports which are independent of the first cooling water ports and are used for cooling water to flow in, the water ring and the water ring cover are jointly limited with a pre-cooling channel which is in fluid communication with the pre-cooling cavity and is annular, and the second cooling water ports are in fluid communication with the pre-cooling channel.

Description

Sizing tube assembly for MPP power tube

Technical Field

The utility model relates to the technical field of MPP power tube production and manufacturing, in particular to a sizing tube assembly for an MPP power tube.

Background

The MPP power pipe (also called MPP power cable protection pipe) is a pipe body made of modified polypropylene as a main raw material, and is suitable for calandria pipes of high-voltage transmission cables above 10KV due to the characteristics of high temperature resistance and external pressure resistance. The sizing device of the MPP power tube is positioned at the end of the corresponding production line and is used for cooling and sizing the tube blank in a shapeable state. The sizing tube device comprises a sizing tube and vacuum equipment in fluid communication with the sizing tube, when the tube blank passes through the sizing tube, the tube blank is attached to the inner wall surface of the sizing tube under the suction action of the vacuum equipment, so that the tube diameter of the MPP power tube product is limited.

The traditional sizing device adopts a mode of combining dripping precooling and indirect cooling to cool the tube blank, and the dripping precooling is to apply a small amount of cooling water to the tube blank between the die outlet and the sizing tube through a water pipe so as to achieve the purposes of primary cooling and lubricating the tube blank; and cooling water is circulated outside the sizing pipe through indirect cooling. However, the water drop precooling can not uniformly cover the outer surface of the pipe due to water flow, namely, the outer surface of the pipe can not be uniformly cooled, so that the conditions of water lines, chromatic aberration and even pits on the surface of the pipe are often caused, and the performance and the appearance of the product are affected; the indirect cooling mode can not timely take away the heat on the surface of the pipe, the cooling speed is low, and the production efficiency of the MPP power pipe assembly line is limited to a certain extent.

Disclosure of Invention

In view of the above-mentioned drawbacks of the conventional sizing devices, it is an object of the present utility model to provide a new sizing tube assembly for MPP power tubes.

In order to achieve the above object, the present utility model provides the following technical solutions: a sizing tube assembly for an MPP power tube comprises a sizing tube, a sizing tube and a sizing device, wherein the sizing tube is limited with an axial lead extending forwards and backwards and a sizing cavity for a tube blank to pass through from front to back, and is provided with a vacuum groove which is in fluid communication with the sizing cavity and is connected with a vacuum device, and at least one cooling groove which is positioned on the inner wall surface and is in fluid communication with the vacuum groove; the water ring is fixedly arranged on the outer side of the sizing pipe, a plurality of first cooling water gaps for cooling water to flow into the sizing pipe assembly are formed in the water ring, and the plurality of first cooling water gaps, the at least one cooling groove and the vacuum groove are sequentially in fluid communication; the water ring cover is fixedly arranged on the front side of the water ring and is limited with a pre-cooling cavity positioned on the front side of the sizing cavity, the water ring or the water ring cover is limited with a plurality of second cooling water ports which are independent of the first cooling water ports and are used for cooling water to flow in, the water ring and the water ring cover are jointly limited with a pre-cooling channel which is in fluid communication with the pre-cooling cavity and is annular, and the second cooling water ports are in fluid communication with the pre-cooling channel.

In the above-described aspect, preferably, the cooling groove extends along the axis in a spiral posture.

In the above technical solution, preferably, the sizing pipe and the water ring define a cooling water pool extending circumferentially, the water ring is provided with a plurality of through holes in fluid communication with the at least one cooling groove, and the plurality of first cooling water ports, the cooling water pool and the plurality of through holes are in fluid communication in sequence.

In the above technical solution, preferably, the first cooling water port is a threaded joint, and the sizing pipe assembly further includes a plurality of sealing bolts that can form threaded connection with the first cooling water port, so that a worker can selectively block the first cooling water port.

In the above technical solution, preferably, the water ring and the water ring cover further define a pre-cooling water pool extending circumferentially, and the second cooling water port, the pre-cooling water pool and the pre-cooling channel are sequentially in fluid communication.

In the foregoing technical solution, preferably, the water ring has a first inclined surface located inside the front surface, the water ring cover has a second inclined surface located inside the rear surface, and the pre-cooling channel is defined by the first inclined surface and the second inclined surface.

In the above preferred embodiment, it is further preferred that the axial distance between the first inclined surface and the second inclined surface gradually decreases from outside to inside.

In the above preferred solution, it is further preferred that the first inclined plane is provided with a plurality of micro water tanks arranged circumferentially.

In the above technical solution, preferably, the device further includes a plurality of adjusting bolts screwed to the water ring cover, and each screw of the adjusting bolts abuts against the front surface of the water ring, so that a worker can adjust the distance between the water ring cover and the water ring.

Compared with the prior art, when the sizing pipe assembly provided by the technical scheme of the utility model is used for cooling and sizing the pipe blank, the annular pre-cooling channel can uniformly cover cooling water on the outer surface of the pipe blank so as to uniformly cool the outer surface of the pipe blank, thereby reducing or avoiding water lines, colors and pits on the outer surface of the pipe and improving the qualification rate of final products. In addition, the sizing pipe assembly can directly cool the pipe blank through at least one cooling groove, so that the production efficiency of the MPP power flow line is improved.

Drawings

FIG. 1 is a schematic perspective view of a sizing tube assembly according to the present utility model;

FIG. 2 is a side cross-sectional view of the sizing tube assembly of FIG. 1;

FIG. 3 is an enlarged view of a portion of the portion A shown in FIG. 2;

FIG. 4 is a schematic perspective view of a water ring and a first pipe section of the sizing pipe assembly of FIG. 1;

the drawing is marked:

100. sizing tube assembly;

1. sizing the tube; 11. sizing the cavity; 12. a first pipe section; 13. a vacuum tank; 14. a second pipe section; 15. a through hole; 16. a cooling tank;

2. a substrate;

3. a water ring; 31. a cooling water tank; 32. a second cooling water port; 33. a first cooling water port; 34. a miniature water tank;

4. a water ring cover; 41. a pre-cooling chamber; 42. a precooling pool; 43. a pre-cooling channel;

5. a cooling water joint; 6. an adjusting bolt; 7. a closing bolt; y, axis line.

Detailed Description

In order to describe the technical content, constructional features, objects and effects of the utility model in detail, the technical solutions of the embodiments of the present application will be described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a detailed description of various exemplary embodiments or modes of practice of the utility model. However, various exemplary embodiments may be practiced without these specific details or with one or more equivalent arrangements. Furthermore, the various exemplary embodiments may be different, but are not necessarily exclusive. For example, the specific shapes, configurations, and characteristics of the exemplary embodiments may be used or implemented in another exemplary embodiment without departing from the inventive concept.

Furthermore, spatially relative terms such as "under … …," "under … …," "under … …," "lower," "above … …," "upper," "above … …," "higher," "side" (e.g., as in "sidewall") and the like are used herein to describe one element's relationship to another element(s) as illustrated in the figures. Spatially relative terms are intended to encompass different orientations of the device in use, operation and/or manufacture in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "under" or "beneath" other elements or features would then be oriented "over" the other elements or features. Thus, the exemplary term "below … …" may include both upper and lower orientations. Furthermore, the device may be otherwise positioned (e.g., rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

Fig. 1 illustrates a sizing tube assembly 100 for an MPP power tube provided by the present utility model, which is disposed at an outlet of an MPP power tube forming mold (not shown in the drawings), and is capable of cooling and sizing the MPP power tube in a moldable shape.

Referring to fig. 2, the sizing tube assembly 100 includes a sizing tube 1 for defining a tube diameter of an MPP power tube, a base plate 2 fixedly disposed on the sizing tube 1 and located outside the sizing tube 1, a water ring 3 located outside the sizing tube 1 and located at a front side of the base plate 2, and a water ring cover 4 fixedly disposed at a front side of the water ring 3. It should be noted that, as used herein, the term "fixed arrangement" means that a relatively fixed positional relationship between two members may be maintained directly or through a third member, and such a connection is also within the broad scope of the term "fixed arrangement" as used herein, where the two members are connected in a detachable or space-adjustable manner and the relative position is maintained under an operating condition.

The sizing tube 1 defines a sizing cavity 11 extending back and forth to an axis Y and through which the MPP power tube passes, and has a plurality of vacuum grooves 13 to which vacuum devices (not shown) are connected, and first and second tube sections 12 and 14 respectively located on front and rear sides of the most upstream vacuum groove 13. Each vacuum groove 13 is in fluid communication with the sizing cavity 11. When the sizing pipe assembly 100 works, the MPP power pipe blank in a plastic state passes through the sizing cavity 11 in sequence from the front; the vacuum device is started, and the tube blank is attached to the inner wall of the sizing tube 1 under the action of vacuum, so that the outer tube diameter of the tube blank is limited. It will be appreciated that the inner diameter of the sizing tube 1 determines the outer diameter of the MPP power tube product.

Referring to fig. 3, the water ring 3 is provided with a plurality of first cooling water ports 33 for cooling water to flow into the sizing tube assembly 100, and the first cooling water ports 33 and the sizing tube 1 together define a cooling water pool 31 which extends circumferentially and can temporarily store part of the cooling water, and each first cooling water port 33 is in fluid communication with the cooling water pool 31. The base plate 2 is provided with a sizing tube assembly 100 fixedly mounted on a corresponding pedestal or frame, which is fixedly arranged at the rear side of the water ring 3 and is in clearance fit with the sizing tube 1 so as to expose the first cooling water gap 33 of the water ring 3.

The front portion of the first tube section 12 is provided with a plurality of circumferentially aligned through holes 15 and defines cooling grooves 16 on the inner wall surface extending axially in a helical posture. The two ends of each through hole 15 are respectively in fluid communication with a cooling water tank 31 and a cooling groove 16, and the end of one side of the cooling groove 16 away from the through holes 15 is in fluid communication with the vacuum groove 13.

When the pipe blank passes through the first pipe section 12, the outer surface of the pipe is attached to the inner wall surface of the first pipe section 12, and forms a cooling channel with the cooling groove 16, wherein the cooling channel can be used for cooling water to directly contact the pipe and flow; the cooling water flows through the cooling water tank 31, the through hole 15, the cooling groove 16 and the vacuum groove 13 in sequence under the suction effect of the vacuum device so as to directly cool the outer surface of the tube blank, thereby achieving the effect of cooling and shaping. In addition, the direct cooling mode adopted by the sizing tube assembly 100 can provide better cooling effect compared with the traditional indirect cooling mode, thereby improving the production efficiency of the corresponding assembly line. In addition, the helically arranged cooling grooves 16 can cool the tube blank more uniformly, thereby improving the yield of the final product.

Further, each of the first cooling water ports 33 is configured as a screw joint, and the sizing tube assembly 100 further provides a closing bolt 7 capable of forming screw connection with the first cooling water port 33 with its head exposed from the rear side of the base plate 2, so that a worker can selectively block part of the first cooling water port 33 depending on the production speed of the actual production line, thereby adjusting the flow rate of cooling water. ( When the production speed of the production line is low, the output of the vacuum device is low, the flow rate of cooling water is low due to the fact that excessive cooling water is introduced, and the cooling effect is reduced; and when the production speed of the production line is high, the expected cooling effect cannot be achieved by too little cooling water. )

With continued reference to fig. 2-4, the inner side of the front surface of the water ring 3 has a first inclined surface (not shown) which is inclined and is provided with a plurality of second cooling water ports 32 which are independent from the first cooling water ports 33 and allow cooling water to flow into the sizing pipe assembly 100, and the sizing pipe assembly 100 is further provided with a cooling water joint 5 fixedly arranged on the second cooling water ports 32 for connection of an external water supply device. In other embodiments, the second cooling water port may also be provided on the water ring cover.

The water ring cover 4 defines a pre-cooling chamber 41 for the tube blank to pass through and on the front side of the sizing chamber 11, and has a second inclined surface (not shown) inside the rear surface and facing the first inclined surface. The water ring cover 4 and the water ring 3 define a pre-cooling water pool 42 which temporarily stores cooling water and takes the shape of a ring; the first and second inclined surfaces define a pre-cooling channel 43 in fluid communication with the pre-cooling pool 42 and in the shape of a ring, the pre-cooling channel 43 being configured such that an axial distance of the first and second inclined surfaces decreases gradually (i.e., an axial distance of the first and second inclined surfaces decreases gradually from outside to inside) along a direction toward the axis Y.

Further, the sizing pipe assembly 100 is further provided with a plurality of adjusting bolts 6 which are in bolted connection with the water ring cover 4, the heads of the adjusting bolts 6 are exposed outwards from the front side of the water ring cover 4, and the screws are abutted against the front surface of the water ring 3, so that a worker can selectively adjust the distance between the first inclined plane and the second inclined plane according to the production speed adjustment of the actual production line, namely, the cross section area of the pre-cooling channel 43 and the flow rate of cooling water flowing through the channel are adjusted.

Still further, a plurality of micro water tanks 34 are circumferentially arranged on the first inclined surface of the water ring 3, and the inner end and the outer end of each micro water tank 34 are respectively in fluid communication with a pre-cooling water tank 42 and a pre-cooling cavity 41. It will be appreciated that even though the first and second sloped surfaces are in contact, the plurality of micro-water tanks 34 still provide cooling water to flow from the pre-cooling water tank 43 to the pre-cooling chamber 41, thereby defining a minimum amount of cooling water for the pre-cooling channel 43.

When the sizing tube assembly 100 works, the tube blank enters the sizing tube assembly 100 through the precooling cavity 41, and the cooling water flows into the precooling cavity 41 and contacts the tube blank through the second cooling water port 32, the precooling water tank 42 and the precooling channel 43 under the action of external pressure, wherein the cooling water is used for primarily reducing the surface temperature of the tube blank and lubricating the outer surface of the tube blank so as to properly improve the toughness of the tube blank under the condition that the tube blank maintains a plastic state (so as to facilitate sizing in later stage), thereby avoiding the tube blank from being sticky or blocking the inlet of the sizing tube 1. Compared with the conventional dripping precooling mode, the precooling channel 43 can form a continuous annular water film and uniformly cover the water film on the outer surface of the tube blank to uniformly cool the tube blank, so as to avoid water marks, chromatic aberration and pits on the outer surface of the tube blank and improve the qualification rate of the final product.

The foregoing has shown and described the basic principles, principal features and advantages of the utility model. It will be understood by those skilled in the art that the present utility model is not limited to the foregoing embodiments, which have been described in the foregoing embodiments and description merely illustrates the principles of the utility model, and various changes and modifications may be made therein without departing from the spirit and scope of the utility model, the scope of which is defined in the appended claims, specification and their equivalents.

Claims (9)

1. The sizing tube assembly for the MPP power tube is characterized by comprising a sizing tube, a sizing tube and a sizing device, wherein the sizing tube is limited with an axial lead extending forwards and backwards and a sizing cavity for a tube blank to pass through the sizing tube from front to back, and is provided with a vacuum groove which is in fluid communication with the sizing cavity and is used for connecting a vacuum device, and at least one cooling groove which is positioned on the inner wall surface and is in fluid communication with the vacuum groove;

the water ring is fixedly arranged on the outer side of the sizing pipe, a plurality of first cooling water gaps for cooling water to flow into the sizing pipe assembly are formed in the water ring, and the plurality of first cooling water gaps, the at least one cooling groove and the vacuum groove are sequentially in fluid communication;

the water ring cover is fixedly arranged on the front side of the water ring and is limited with a pre-cooling cavity positioned on the front side of the sizing cavity, the water ring or the water ring cover is limited with a plurality of second cooling water ports which are independent of the first cooling water ports and are used for cooling water to flow in, the water ring and the water ring cover are jointly limited with a pre-cooling channel which is in fluid communication with the pre-cooling cavity and is annular, and the second cooling water ports are in fluid communication with the pre-cooling channel.

2. The sizing tube assembly of claim 1, wherein the cooling groove extends along the axis in a helical configuration.

3. The sizing tube assembly of claim 1, wherein the sizing tube and the water ring define a circumferentially extending cooling water pool, the water ring defining a plurality of through holes in fluid communication with the at least one cooling channel, the plurality of first cooling water ports, the cooling water pool, and the plurality of through holes in sequence.

4. The sizing tube assembly of claim 1, wherein the first cooling nozzle is a threaded connection, and further comprising a plurality of sealing bolts threadably coupled to the first cooling nozzle for a worker to selectively block the first cooling nozzle.

5. The sizing tube assembly of claim 1, wherein the water ring and the water ring cover further define a circumferentially extending pre-cooling water sump, the second cooling water port, the pre-cooling water sump, and the pre-cooling channel being in fluid communication in sequence.

6. The sizing tube assembly of claim 1, wherein the water ring has a first chamfer disposed inwardly of the front surface and the water ring cover has a second chamfer disposed inwardly of the rear surface, the pre-cooling channel being defined by the first chamfer and the second chamfer.

7. The sizing tube assembly of claim 6, wherein an axial distance of the first chamfer from the second chamfer tapers from outside to inside.

8. The sizing tube assembly of claim 7, wherein the first inclined surface is provided with a plurality of circumferentially arranged micro-water tanks.

9. The sizing tube assembly of claim 1, further comprising a plurality of adjustment bolts threadably coupled to the water ring cover, a threaded shaft of each of the adjustment bolts abutting a front surface of the water ring for a worker to adjust a spacing between the water ring cover and the water ring.

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