Mold centering adjusting method and device

Abstract

The invention discloses a mold centering adjusting method and device, and belongs to the technical field of optical cable production equipment.The mold centering adjusting device comprises a mold core and a mold cover, and the mold core is arranged in the mold cover in a penetrating mode; the mold cover comprises a fixed mold cover and a movable mold cover which are sequentially arranged in the third direction, and a plurality of deviation adjusting screw rods are arranged on the circumferential side wall of the movable mold cover; the outlet end of the mold cover is also provided with a plurality of ultrasonic probes, and the plurality of ultrasonic probes are uniformly distributed along the radial direction of the cable. According to the mold centering adjustment method, the positions of the inner layer and the outer layer of the produced sheath are obtained in an ultrasonic reflection mode, the center position of the sheath is obtained by combining the wave crest and wave trough parameters of the surface layer of the sheath, and then the center position of the corresponding movable mold cover is obtained through the center position of the sheath; and the position of the movable mold cover is adjusted according to the standard center position of the mold, so that centering adjustment of the mold is realized.

Description

Technical Field

[0001] The present invention belongs to the technical field of optical cable production equipment, and particularly relates to a die centering adjustment method and device. Background Art

[0002] With the increasing maturity of optical cable production technology and the fierce competition in the optical cable market, the high efficiency, high precision and cost advantage of optical cable production are the core indicators of manufacturers. With the diversification and complex structure of optical cable products, more different types of optical cables need to be dealt with on the same production line.

[0003] In conventional optical cable production, the extrusion die of the optical cable usually consists of a die sleeve and a die core. A sheath with a certain thickness is extruded through the matching gap between the two. When producing sheaths with different outer diameters or wall thicknesses, different die sleeve and die core structures need to be replaced, and most circular optical cables have requirements for concentricity. Usually, the concentricity adjustment of the die core and the die sleeve is completed before the production extrusion of the optical cable, and then the production of the optical cable sheath is carried out. As the production progresses, when the die core and the die sleeve of the extrusion die shift, since the optical cable is extruded at the die sleeve opening, it is difficult to identify the accurate profiles of the die sleeve and the die core, resulting in the inability to adjust the concentricity of the die during the production process. At this time, the production line can only be stopped for processing, which greatly reduces the production efficiency of the optical cable. Summary of the Invention

[0004] In view of one or more of the above-mentioned defects or improvement requirements of the prior art, the present invention provides a die centering adjustment method to solve the problem that the existing method cannot complete the centering adjustment of the extrusion die during the production process.

[0005] To achieve the above object, the present invention provides a die centering adjustment method, which includes the following steps: S1. Obtain the standard center position of the die; S2. Based on ultrasonic reflection, obtain the inner layer position of the sheath, and based on ultrasonic reflection, obtain the peak and valley positions of the surface wave of the outer layer of the sheath; S3. Calculate the center position of the moving die cover based on the peak and valley positions of the surface wave of the outer layer of the sheath obtained by ultrasonic reflection; S4. Adjust the center position of the moving die cover based on the standard center position of the die to achieve the centering adjustment of the die.

[0006] As a further improvement of the present invention, a plurality of ultrasonic probes are arranged in the extrusion direction of the die, and the plurality of ultrasonic probes are evenly distributed along the radial direction of the sheath; The specific content of step S2 includes: The ultrasonic probe emits ultrasonic waves to the surface of the sheath at a set frequency, obtains the reflected signals acquired by the ultrasonic probe within the first preset time, and based on the reflected signals, obtains the peak and valley positions at the current ultrasonic probe within the first preset time; based on multiple ultrasonic probes, obtains the peak and valley positions at various circumferential positions on the surface of the sheath within the first preset time.

[0007] As a further improvement of the present invention, in step S3, the central position of the moving mold cover is the center position of the sheath circle, and the calculation of the center position of the sheath circle specifically includes: Based on the peak and valley positions at a single ultrasonic probe within the first preset time, obtains the average surface position at the current sheath point. Based on the average positions at the sheath point positions corresponding to multiple ultrasonic probes, obtains the outer contour of the sheath surface. Based on the outer contour of the sheath surface, obtains the center position of the sheath circle.

[0008] As a further improvement of the present invention, multiple ultrasonic probes are symmetrically arranged along the circumference of the sheath; in step S3, the central position of the moving mold cover is the center position of the sheath circle, and the calculation of the center position of the sheath circle specifically includes: Obtains the maximum peak and valley positions among multiple ultrasonic probes, and obtains the first average position of the maximum peak and valley. Sets the ultrasonic probe corresponding to the maximum peak and valley as the first ultrasonic probe, obtains the peak and valley positions of the second ultrasonic probe symmetrically arranged with the first ultrasonic probe, and based on the peak and valley positions of the second ultrasonic probe, obtains the second average position. Obtains the center position of the sheath circle according to the first average position and the second average position.

[0009] As a further improvement of the present invention, multiple ultrasonic probes are symmetrically arranged along the circumference of the sheath; the calculation of the central position of the moving mold cover in step S3 specifically includes: Obtains the peak and valley positions of multiple ultrasonic probes, and obtains the peak and valley positions of the first ultrasonic probe and the second ultrasonic probe symmetrically arranged. Based on the peak and valley positions of the first ultrasonic probe and the second ultrasonic probe, obtains the extrusion pressure difference at the extrusion outlet of the corresponding moving mold cover. According to the extrusion pressure difference at the extrusion outlet of the moving mold cover, obtains the displacement deviation between the corresponding position of the moving mold cover and the standard center position of the mold. According to the displacement deviation between the extrusion outlet of the moving mold cover and the standard center position of the mold, obtains the central position of the moving mold cover.

[0010] As a further improvement of the present invention, the obtaining of the standard center position of the mold in step S1 includes: Image recognition is used to obtain at least three points on the outer contour of the moving mold cover. The three points are evenly distributed circumferentially along the outer contour of the moving mold cover, and the central positions of the three points are obtained. The central position is the standard central position of the mold.

[0011] As a further improvement of the present invention, the centering adjustment of the mold in step S4 is completed by adjusting the moving mold cover through an adjustment mechanism. The adjustment mechanism includes a first offset screw, a second offset screw, a third offset screw, and a fourth offset screw arranged radially along the cable. The first offset screw, the second offset screw, the third offset screw, and the fourth offset screw are symmetrically arranged in pairs. The centering adjustment of the mold specifically includes: The central position of the moving mold cover and the standard central position of the mold are decomposed into displacement amounts in the first direction and the second direction. The displacement in the first direction is adjusted by the first offset screw or the second offset screw, and the displacement in the second direction is adjusted by the third offset screw or the fourth offset screw to complete the centering adjustment of the mold.

[0012] This application also includes a mold centering adjustment device for implementing the above mold centering adjustment method, which includes: A mold core and a mold cover, the mold core is disposed through the mold cover. The mold cover includes a fixed mold cover and a moving mold cover arranged in sequence along the third direction; the fixed mold cover is connected to the extrusion outlet of the extruder; a plurality of offset screws are provided on the circumferential side wall of the moving mold cover, and the plurality of offset screws abut against the moving mold cover along the circumferential direction of the screw, and the offset screws are adjustable in displacement along the axial direction of the screw. A plurality of ultrasonic probes are further provided at the outlet end of the mold cover, and the plurality of ultrasonic probes are evenly distributed radially along the cable.

[0013] As long as the above improvement technical features do not conflict with each other, they can be combined with each other.

[0014] Generally speaking, compared with the prior art, the beneficial effects of the above technical solutions conceived by the present invention include: (1)The die centering adjustment method of the present invention obtains the inner and outer layer positions of the produced sheath by using the ultrasonic reflection method, and combines the peak and valley parameters of the sheath surface layer to obtain the center position of the sheath. Then, the center position of the corresponding moving die cover is obtained through the center position of the sheath, and the position of the moving die cover is adjusted according to the standard center position of the die, so as to realize the centering adjustment of the die. The die centering adjustment method in this application obtains the position information of the corresponding moving die cover through the position of the produced sheath and surface defects, etc., and then correspondingly adjusts the moving die cover according to the standard center position of the die to realize the centering adjustment of the die. This application inversely deduces the center position of the moving die cover through the position information of the produced sheath, solves the problem of the blockage of the moving die cover contour by the sheath material in the existing production process, and realizes the acquisition and adjustment of the center position of the moving die cover during the production process.

[0015] (2)The die centering adjustment method of the present invention emits ultrasonic waves to the surface layer of the optical cable sheath by using an ultrasonic probe. Since the materials of the optical fiber, water-blocking yarn, armor, etc. inside the optical cable are different from those of the sheath, when the ultrasonic waves irradiate the surface and inner layer of the sheath, reflection will occur. The surface and inner layer positions of the sheath are obtained through the received reflection signals, so as to obtain the peak and valley information of the sheath surface. Correspondingly, this application obtains the average thickness at the current point by obtaining the fluctuation situation of the sheath surface within a period of time, and then fits the information obtained by multiple ultrasonic probes in the circumferential direction of the sheath to obtain the contour structure of the sheath, so as to obtain the center position of the moving die cover. This method is simple and fast, and can avoid the problem that the shape of the sheath does not correspond to the shape of the extrusion port of the moving die cover caused by problems such as the extrusion expansion and jitter fluctuation of the sheath material, so as to accurately obtain the center position of the moving die cover, realize the calculation and acquisition of the center position of the moving die cover during the production process, and realize the dynamic adjustment of the die during the production process.

[0016] (3)The die centering adjustment method of the present invention obtains the extrusion pressure difference at the position of the moving die cover corresponding to the sheath through the peak and valley information of the sheath surface obtained by ultrasonic waves, and correspondingly calculates the displacement deviation inside the moving die cover to obtain the center position of the moving die cover, so as to realize the calculation and acquisition of the center position of the moving die cover during the production process and the dynamic adjustment of the die during the production process.

[0017] (4)The die centering adjustment method of the present invention sets a plurality of adjustment screws on the outer periphery of the moving die cover. Through the deviation between the center position of the moving die cover calculated by the above method and the standard center position of the die, finally, the deviation amount is decomposed to obtain the progress amount on each adjustment screw, and finally, the moving die cover is pushed to move by adjusting the adjustment screws, so as to realize the centering adjustment of the die. Description of the Drawings

[0018] Figure 1 is the overall structural schematic diagram of the die centering adjustment device in the embodiment of the present invention; Figure 2 It is a detection schematic diagram of the ultrasonic probe for the sheath in the embodiment of the present invention; Figure 3 It is a schematic diagram of the surface structure of the sheath in the embodiment of the present invention; Figure 4 It is a schematic flow diagram of the die centering adjustment method in the embodiment of the present invention.

[0019] In all the drawings, the same reference numerals represent the same technical features, specifically: 1. Mold core; 2. Fixed mold cover; 3. Movable mold cover; 4. Biasing screw; 5. Ultrasonic probe. Detailed implementation manners

[0020] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0021] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation of the present invention.

[0022] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "a plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0023] In the present invention, unless otherwise clearly specified or limited, the terms "mounted", "connected", "coupled", "fixed", etc. shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral body; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] In the present invention, unless otherwise clearly specified or limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0025] Embodiment: Please refer to Figures 1 to 4 , the die centering adjustment device in the preferred embodiment of the present invention includes a die core 1 and a die cover, and the die core 1 is inserted into the die cover. Among them, the die cover includes a fixed die cover 2 and a movable die cover 3 arranged in sequence along the third direction. The fixed die cover 2 is connected to the extrusion outlet of the extruder; a plurality of offset adjusting screws 4 are provided on the circumferential side wall of the movable die cover 3, and the plurality of offset adjusting screws 4 abut against the movable die cover 3 along the axial direction of the screw, and the offset adjusting screw 4 is axially displaceable along the screw; at the same time, a plurality of ultrasonic probes 5 are further provided at the outlet end of the die cover, and the plurality of ultrasonic probes 5 are arranged radially along the cable.

[0026] Specifically, the present application obtains the outer contour position of the sheath through a plurality of ultrasonic probes 5, obtains the center position of the movable die cover 3 through the outer contour of the sheath, obtains the offset of the movable die cover 3 by comparing with the standard center position of the die, and then completes the position adjustment of the movable die cover 3 through a plurality of offset adjusting screws 4 to realize the centering adjustment of the die.

[0027] Further, the multiple alignment adjusting screws 4 in the present application specifically include a first alignment adjusting screw 4, a second alignment adjusting screw 4, a third alignment adjusting screw 4, and a fourth alignment adjusting screw 4. The first alignment adjusting screw 4 and the second alignment adjusting screw 4 are oppositely arranged and are used to drive the moving die cover 3 to displace in the first direction; the third alignment adjusting screw 4 and the fourth alignment adjusting screw 4 are oppositely arranged and are used to drive the moving die cover 3 to displace in the second direction. After obtaining the specific offset amount of the moving die cover 3, the four alignment adjusting screws 4 are adjusted to complete the centering adjustment of the moving die cover 3. It should be noted that during the production and preparation process of the optical cable, the positions of the die core 1 and the fixed die cover 2 of the mold are basically fixed, and only the position of the moving die cover 3 needs to be adjusted. Therefore, the standard center position of the mold in the present application can be understood as the standard center position of the moving die cover 3. The mold centering adjustment method and adjustment device in the present application are both used to adjust the position of the moving die cover 3.

[0028] Preferably, the first direction in the present application is the vertical direction, the second direction is the horizontal direction, and the third direction is the axial extension direction of the optical cable.

[0029] Further, the present application further includes a mold centering adjustment method, which specifically includes the following steps: S1. Obtain the standard center position of the mold; S2. Based on ultrasonic reflection, obtain the inner layer position of the sheath, and based on ultrasonic reflection, obtain the peak and valley positions of the surface wave of the outer layer of the sheath; S3. Calculate the center position of the moving die cover 3 based on the peak and valley positions of the outer surface wave of the sheath obtained by ultrasonic reflection; S4. Adjust the center position of the moving die cover 3 based on the standard center position of the mold to achieve the centering adjustment of the mold.

[0030] In the existing cable production and preparation process, the alignment of the mold is mainly adjusted after the mold assembly and before the production and preparation. In order to achieve the alignment adjustment of the mold, the moving mold cover 3 is usually in an adjustable form and is fixed mechanically after the adjustment. However, factors such as the assembly gap between the molds, the adjustment of conventional production process parameters, and the working fluctuations of production equipment are likely to cause the position deviation of the moving mold cover 3. During the production process, the sheath extruded from the mold will expand slightly due to the pressure difference inside and outside the mold. When the sheath material passes through the extrusion port of the moving mold cover 3, it will block the extrusion port, thereby making it impossible to obtain the mold position, resulting in the inability to adjust the mold position during the production process. Secondly, due to the displacement deviation problem of the moving mold cover 3 itself, the center of the mold core 1 does not coincide with the center of the moving mold cover 3, resulting in inconsistent circumferential wall thickness of the sheath. In addition, the flow channel space outside the mold core 1 will also be inconsistent, resulting in unbalanced circumferential pressure of the mold core 1. When the extruder extrudes the sheath material at a constant rate, the unbalanced circumferential pressure of the mold core 1 will cause fluctuations in the extrusion of the sheath surface, and then cause wrinkles on the sheath surface. Traditional industrial cameras obtain the surface position information of the sheath in an instantaneous state, and the wrinkles on the sheath surface will cause misjudgment of the extrusion position of the sheath, ultimately resulting in an incorrect calculated offset of the moving mold cover 3.

[0031] The core of the present invention is to obtain the inner and outer positions of the produced sheath by using the ultrasonic reflection method, and combine the peak and valley parameters of the sheath surface layer to calculate the center position of the sheath. Then, the center position of the corresponding mold cover is obtained through the center position of the sheath, and then the position of the moving mold cover 3 is adjusted according to the standard center position of the mold, so as to realize the alignment adjustment of the mold during the production process.

[0032] Specifically, in step S1 of the present application, the standard center position of the mold is obtained by photographing through an image recognition device before production. Specifically, the obtaining of the standard center position of the mold in step S1 above includes: Image recognition is used to obtain at least 3 points on the outer contour of the moving mold cover 3. These 3 points are evenly distributed along the circumferential direction of the outer contour of the moving mold cover 3, and then the center positions of the three points are obtained. The center positions of these three points are the standard center positions of the mold. The center position of the outer contour before production is the standard center position of the mold. At this time, the extrusion port contour of the mold is completely clear. By selecting 3 points evenly distributed along the circumferential direction on the moving mold cover 3, the standard center position of the mold can be obtained. Optionally, by obtaining the information of multiple points on the outer contour of the moving mold cover 3, a more accurate standard center position of the mold can be obtained.

[0033] Specifically, a plurality of ultrasonic probes 5 are provided on the mold of the present application in the extrusion direction, and the plurality of ultrasonic probes 5 are evenly distributed along the radial direction of the sheath; step S2 specifically includes: The ultrasonic probe 5 emits ultrasonic waves to the surface of the sheath at a set frequency, obtains the reflected signals acquired by the ultrasonic probe 5 within the first preset time, and based on the reflected signals, obtains the peak and valley positions of the current ultrasonic probe 5 within the first preset time; based on the peak and valley positions of the ultrasonic probes 5 at various circumferential positions on the surface of the sheath within the first preset time. During the extrusion process of the sheath, due to the production fluctuations of the sheath caused by the position offset of the moving die cover 3, wrinkles will appear on the surface of the sheath, so problems such as peaks and valleys will correspondingly appear on the surface of the sheath. The peak and valley positions obtained by single-frequency acquisition may be inaccurate in obtaining the outer contour of the sheath due to production fluctuation factors. Therefore, in this application, multiple reflected signals are acquired within the first preset time, and based on the reflected signals, the peak and valley distribution along the cable axis at the current position is obtained, so as to obtain the peak and valley positions of the corresponding sheath surface at the current ultrasonic probe 5 within the first preset time.

[0034] Further, as a further improvement of the present invention, the central position of the moving die cover 3 in the above step S3 is the center position of the sheath, and the calculation of the center position of the sheath specifically includes: Based on the peak and valley positions of a single ultrasonic probe 5 within the first preset time, obtain the average position of the surface at the current sheath point. Based on the average positions of the surfaces at the sheath points corresponding to multiple ultrasonic probes 5, obtain the outer contour of the sheath surface. Based on the outer contour of the sheath surface, obtain the center position of the sheath.

[0035] As one optional way of the present invention, in this application, the average position of the sheath surface at the current position is obtained by the peak and valley positions of a single ultrasonic probe 5 within the first preset time; then, the outer contour structure of the sheath surface is calculated by multiple ultrasonic probes 5 distributed circumferentially on the sheath, and then the center position of the sheath is calculated through the outer contour of the sheath surface.

[0036] Further, as another optional embodiment of the present invention, another calculation method for the center position of the sheath in this application specifically includes: Obtain the maximum peak and valley positions among multiple ultrasonic probes 5, and obtain the first average position of the maximum peak and valley. Set the ultrasonic probe 5 corresponding to the maximum peak and valley as the first ultrasonic probe 5, obtain the peak and valley positions of the second ultrasonic probe 5 symmetrically arranged with the first ultrasonic probe 5, and obtain the second average position based on the peak and valley positions of the second ultrasonic probe 5. Obtain the center position of the sheath according to the first average position and the second average position.

[0037] When the dynamic mold cover 3 is offset, the thickness of the corresponding sheath along the middle cable core is unevenly arranged. The thicker the part, the more violent the extrusion pressure fluctuation, and the greater the difference between the peak and the trough. Therefore, the position of the sheath corresponding to the maximum peak and the trough is the offset direction of the dynamic mold cover 3. By obtaining the position of the second ultrasonic probe 5 corresponding to the first ultrasonic probe 5, and according to the peak and trough positions of the two, the center position of the two can be calculated, which is the center position of the sheath, and also the center position of the dynamic mold cover 3.

[0038] Further, as another optional embodiment of the present invention, the calculation of the center position of the movable mold cover 3 in step S3 of the present application includes: Acquire the peak and trough positions of the multiple ultrasonic probes 5, and acquire the peak and trough positions of the first ultrasonic probe 5 and the second ultrasonic probe 5 which are symmetrically arranged; Obtaining the extrusion pressure difference at the extrusion port of the corresponding movable die cover 3 according to the wave crest and wave trough positions of the first ultrasonic probe 5 and the second ultrasonic probe 5; According to the extrusion pressure difference at the extrusion port of the movable die cover 3, the displacement deviation between the movable die cover 3 at the corresponding position and the standard center position of the die is obtained; The center position of the movable die cover 3 is obtained according to the displacement deviation between the extrusion port of the movable die cover 3 and the standard center position of the die.

[0039] As mentioned above, when the position of the dynamic mold cover 3 is offset, the sheath is divided into multiple areas along the radial direction of the optical cable with the cable axis as the center, and each ultrasonic probe 5 corresponds to one area. The change of the extrusion space in the dynamic mold cover 3 leads to the change of the extrusion pressure, which corresponds to the height difference difference between the peaks and valleys. The height difference between the peaks and valleys is positively correlated with the extrusion pressure difference at the extrusion port of the dynamic mold cover 3, and the corresponding extrusion pressure difference is positively correlated with the extrusion space in the dynamic mold cover 3. By obtaining the size of each extrusion space in the circumferential area of ​​the dynamic mold cover 3, the displacement deviation of the center position of the dynamic mold cover 3 can be obtained, thereby obtaining the center position of the dynamic mold cover 3.

[0040] As one of the optional embodiments of the present invention, the present application can adjust the position of the movable mold cover 3 in advance to cause a displacement deviation between the movable mold cover 3 and the mold core 1, and obtain the corresponding fluctuation of the peaks and troughs on the surface of the sheath, so as to establish a data table. When peaks and troughs with corresponding height differences appear on the surface of the sheath, the displacement deviation in the current direction can be inferred, so as to obtain the displacement deviation of the movable mold cover 3, and finally calculate the center position of the movable mold cover 3. As another optional embodiment of the present invention, the present application can also calculate the fluctuation function of the peaks and troughs on the surface of the sheath, and correspondingly fit the internal extrusion space of the movable mold cover 3, so as to calculate the change of the internal space of the movable mold cover 3, and finally calculate the center position of the movable mold cover 3.

[0041] Furthermore, the centering adjustment of the mold in step S4 of the present application specifically includes: The central position of the moving die cover 3 and the standard central position of the mold are decomposed into displacement amounts in the first direction and the second direction. The displacement in the first direction is adjusted by the first offset screw 4 or the second offset screw 4, and the displacement in the second direction is adjusted by the third offset screw 4 or the fourth offset screw 4 to complete the centering adjustment of the mold.

[0042] Those skilled in the art can easily understand that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A die alignment adjustment method, characterized in that, It includes the following steps: S1. Obtain the standard center position of the mold; S2. Obtain the inner layer position of the sheath based on ultrasonic reflection, and obtain the peak and valley positions of the surface wave of the outer layer of the sheath based on ultrasonic reflection; S3. Calculate the center position of the moving mold cover based on the peak and valley positions of the surface wave of the outer layer of the sheath obtained by ultrasonic reflection; S4. Adjust the center position of the moving mold cover based on the standard center position of the mold to achieve the centering adjustment of the mold.

2. The mold centering adjustment method according to claim 1, characterized in that, A plurality of ultrasonic probes are arranged in the extrusion direction of the mold, and the plurality of ultrasonic probes are evenly distributed along the radial direction of the sheath; The specific content of step S2 includes: The ultrasonic probe emits ultrasonic waves to the surface of the sheath at a set frequency, obtains the reflection signal obtained by the ultrasonic probe within the first preset time, and obtains the peak and valley positions at the current ultrasonic probe within the first preset time based on the reflection signal; based on the plurality of ultrasonic probes, obtain the peak and valley positions at each circumferential position of the sheath surface within the first preset time.

3. The mold centering adjustment method according to claim 2, characterized in that In step S3, the center position of the moving mold cover is the center position of the sheath, and the calculation of the center position of the sheath specifically includes: Obtain the surface average position at the current sheath point based on the peak and valley positions at the first ultrasonic probe within the first preset time; Obtain the outer contour of the sheath surface based on the surface average positions at the sheath points corresponding to the plurality of ultrasonic probes; Obtain the center position of the sheath based on the outer contour of the sheath surface.

4. The mold centering adjustment method according to claim 2, characterized in that, The plurality of ultrasonic probes are symmetrically arranged along the circumferential direction of the sheath; in step S3, the center position of the moving mold cover is the center position of the sheath, and the calculation of the center position of the sheath specifically includes: Obtain the maximum peak and valley position among the plurality of ultrasonic probes, and obtain the first average position of the maximum peak and valley; Set the ultrasonic probe corresponding to the maximum peak and valley as the first ultrasonic probe, obtain the peak and valley position of the second ultrasonic probe symmetrically arranged with the first ultrasonic probe, and obtain the second average position based on the peak and valley position of the second ultrasonic probe; Obtain the center position of the sheath according to the first average position and the second average position.

5. The mold centering adjustment method according to claim 2, wherein The plurality of ultrasonic probes are symmetrically arranged along the circumferential direction of the sheath; the calculation of the center position of the moving mold cover in step S3 specifically includes: Obtain the peak and valley positions of the plurality of ultrasonic probes, and obtain the peak and valley positions of the first ultrasonic probe and the second ultrasonic probe symmetrically arranged; Obtain the extrusion pressure difference at the extrusion port of the corresponding moving mold cover according to the peak and valley positions of the first ultrasonic probe and the second ultrasonic probe; Obtain the displacement deviation between the corresponding position of the moving mold cover and the standard center position of the mold according to the extrusion pressure difference at the extrusion port of the moving mold cover; Obtain the center position of the moving mold cover according to the displacement deviation between the extrusion port of the moving mold cover and the standard center position of the mold.

6. The mold centering adjustment method according to claim 1, characterized in that, In step S1, the standard center position of the mold is obtained by photographing through an image recognition device before production.

7. The mold centering adjustment method according to claim 6, characterized in that The obtaining of the standard center position of the mold in step S1 includes: Image recognition obtains at least 3 points on the outer contour of the moving mold cover, the 3 points are evenly distributed along the circumferential direction of the outer contour of the moving mold cover, obtain the center position of the three points, and the center position is the standard center position of the mold.

8. The mold centering adjustment method according to claim 1, characterized in that, In the step S4, the centering adjustment of the mold is completed by adjusting the moving mold cover through an adjustment mechanism. The adjustment mechanism includes a first offset screw, a second offset screw, a third offset screw, and a fourth offset screw arranged radially along the cable. The first offset screw, the second offset screw, the third offset screw, and the fourth offset screw are symmetrically arranged in pairs. The centering adjustment of the mold specifically includes: Decomposing the center position of the moving mold cover and the standard center position of the mold into displacement amounts in the first direction and the second direction, adjusting the displacement in the first direction through the first offset screw or the second offset screw, and adjusting the displacement in the second direction through the third offset screw or the fourth offset screw to complete the centering adjustment of the mold.

9. A die centering adjustment device, which is used to implement the die centering adjustment method described in any one of claims 1 to 8, characterized in that, It includes: A mold core and a mold cover, and the mold core is inserted into the mold cover. The mold cover includes a fixed mold cover and a moving mold cover arranged in sequence along the third direction; the fixed mold cover is connected to the extrusion outlet of the extruder; a plurality of offset screws are provided on the circumferential side wall of the moving mold cover, and the plurality of offset screws abut against the moving mold cover along the axial direction of the screw, and the offset screws are axially displaceable along the screw. A plurality of ultrasonic probes are further provided at the outlet end of the mold cover, and the plurality of ultrasonic probes are evenly distributed radially along the cable.

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