Device for measuring eccentricity of inner die and outer die of plastic extruding machine
By using the extruder's inner and outer die eccentricity measuring device, the problem of uneven cable insulation layer thickness caused by inner and outer die eccentricity was solved, enabling rapid and precise concentricity adjustment of inner and outer dies and improving the production quality of cable insulation layer.
Patent Information
- Application Number
- CN202520070991.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-13
- Publication Date
- 2025-12-05
- Estimated Expiration
- 2035-01-13
AI Technical Summary
In the existing technology, the eccentricity of the inner and outer molds of the extruder leads to uneven thickness of the cable insulation layer, which affects the insulation performance of the cable, and there is a lack of effective and accurate measurement methods.
A device for measuring the eccentricity of the inner and outer molds of an extruder is provided, including a centering shaft, a coarse measuring component, and a fine measuring component. By installing the centering shaft coaxially with the inner mold and combining it with the measuring devices on the cone sleeve and the rotary seat, the eccentricity can be measured quickly and accurately.
It enables rapid rough measurement and precise measurement of inner and outer molds, ensuring that the concentricity of inner and outer molds meets production requirements and improving the production quality of cable insulation layers.
Smart Images
Figure CN223636790U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the field of mechanical measurement, in particular to a device for measuring eccentricity of inner and outer dies of an extruder. BACKGROUND
[0002] An extruder is usually used in the production of cable insulation. The dies in the head of the extruder are divided into inner and outer dies which are nested with each other. The inner die is hollow and penetrates the cable core to be extruded. The high-temperature extrusion channel is between the inner and outer dies. The inner die is fixed in the head of the extruder, and the outer die is adjustable in the radial position relative to the inner die. In production, the eccentricity of the inner and outer dies, i.e. the non-uniform thickness of the cable insulation caused by the eccentricity, will adversely affect the insulation performance of the cable.
[0003] Before the inner and outer dies of the extruder are installed and the cable core is penetrated for extrusion production, the eccentricity (including eccentric distance and eccentric azimuth angle) of the inner and outer dies is measured to determine whether the concentricity of the inner and outer dies meets the production requirements. The concentricity of the inner and outer dies can be quickly and accurately adjusted according to the measurement value to ensure the production quality. Therefore, accurate measurement of the eccentricity of the inner and outer dies of the extruder is of great significance in cable production. CONTENT OF THE INVENTION
[0004] In order to accurately measure the eccentricity of the inner and outer dies of the extruder, the present application provides a device for measuring the eccentricity of the inner and outer dies of the extruder.
[0005] The device for measuring the eccentricity of the inner and outer dies of the extruder provided by the present application adopts the following technical solution:
[0006] A device for measuring the eccentricity of the inner and outer dies of an extruder, comprising a centering shaft, a coarse measurement assembly and a fine measurement assembly; wherein:
[0007] The centering shaft is arranged in the hole of the inner die and one end of the centering shaft is located outside the inner die. The centering shaft is coaxial with the inner die.
[0008] The coarse measurement assembly comprises a tapered sleeve which is slidably sleeved on the centering shaft. A through hole is formed in the centering shaft along the axial direction thereof. The through hole is divided into a large-diameter section and a small-diameter section with different inner diameters. The inner diameter of the large-diameter section is larger than the outer diameter of the inner die, and the inner wall of the small-diameter section abuts against the outer wall of the centering shaft. The outer wall of the centering shaft is a conical surface, and the conical surface is provided with marking lines for indicating the diameter and angle.
[0009] The fine measurement assembly comprises a rotary seat which is rotatably sleeved on the centering shaft. The rotary seat is provided with a measuring device for measuring the eccentricity of the inner and outer dies.
[0010] Further, a limiting boss is arranged on the outer periphery of the centering shaft, and the limiting boss abuts against the hole of the inner die.
[0011] The limiting boss helps to avoid axial relative sliding between the centering shaft and the inner mold.
[0012] Further, the centering shaft is fixed with a handle at one end outside the inner mold.
[0013] Further, a slide groove is arranged on the side wall of the centering shaft at one end outside the inner mold, the length direction of the slide groove is parallel to the axial direction of the centering shaft, and the anti-rotation pin is arranged through the anti-rotation pin in the radial direction of the taper sleeve, and the end of the anti-rotation pin is located in the slide groove.
[0014] The anti-rotation pin and the slide groove are in sliding fit, which helps to avoid relative rotation between the centering shaft and the taper sleeve.
[0015] Further, the centering shaft is provided with a directional arrow at one end outside the inner mold, and the directional arrow is arranged in the radial direction of the centering shaft; and the end of the outer mold is provided with a vertical scale line, and the vertical scale line is arranged in the radial direction of the outer mold.
[0016] Further, the slide groove and the directional arrow are respectively located at two ends in the radial direction of the centering shaft.
[0017] Further, the scale line includes a plurality of annular diameter scale lines which are spaced apart in the axial direction of the conical surface.
[0018] Further, the scale line further includes a plurality of linear angle scale lines which are spaced apart in the circumferential direction of the conical surface, and one of the plurality of linear angle scale lines is marked with an angle value of zero.
[0019] Further, the anti-rotation pin and the angle scale line marked with the angle value of zero are respectively located at two ends in the radial direction of the taper sleeve.
[0020] Before measurement, the centering shaft is inserted into the hole of the inner mold, the limiting boss abuts against the hole of the inner mold, the centering shaft is rotated by the handle, and the directional arrow of the centering shaft is aligned with the vertical scale line at the end of the outer mold.
[0021] During measurement, the taper sleeve is slowly inserted into the gap between the inner mold and the outer mold along the centering shaft, in this process, the anti-rotation pin and the slide groove are in sliding fit, and the vertical scale line, the directional arrow and the angle scale line marked with the angle value of zero are aligned, the taper sleeve is slowly inserted until the conical surface of the outer wall of the taper sleeve contacts the hole of the outer mold, and according to the diameter value indicated by the contact point on the diameter scale line and the angle value indicated by the contact point on the angle scale line, the eccentricity and the angle offset between the center axes of the inner mold and the outer mold can be calculated.
[0022] Further, the measuring device includes a small lever dial gauge installed on the rotary seat, the measuring head of the small lever dial gauge abuts against the inner wall of the hole of the outer mold, and the end face of the rotary seat is provided with an end face angle scale line.
[0023] When measuring, the rotary seat is arranged on the centering shaft, the measuring head of the small lever dial gauge is abutted against the inner wall of the hole of the outer mold, the rotary seat is slowly rotated for one circle in the state that the end of the rotary seat abuts against the limiting boss of the centering shaft, and the difference between the maximum value and the minimum value of the reading of the small lever dial gauge is recorded during the rotation ， and the angle reading of the end face angle scale line pointed by the direction arrow of the centering shaft when the maximum and minimum readings of the small lever dial gauge are obtained, so that the eccentricity and the angle offset of the inner mold and the outer mold can be calculated.
[0024] In summary, the present application has the following beneficial technical effects:
[0025] The present application has the advantages of simple structure, convenient measurement, fast measurement of the eccentricity of the inner mold and the outer mold by using the coarse measurement assembly, and application to the scene with low requirement on the measurement accuracy; accurate measurement of the eccentricity by using the fine measurement assembly, and application to the scene with high requirement on the measurement accuracy; and accurate adjustment of the radial position of the outer mold according to the measured eccentricity, so that the concentricity of the inner mold and the outer mold meets the production requirement. BRIEF DESCRIPTION OF DRAWINGS
[0026] Figure 1 is a sectional view of the coarse measurement assembly of the embodiment of the present application;
[0027] Figure 2 is a sectional view of the fine measurement assembly of the embodiment of the present application;
[0028] Figure 3 is a schematic view of the measurement of the eccentricity of the inner mold and the outer mold by using the coarse measurement assembly in the embodiment of the present application.
[0029] Fig. 1 is a schematic view of the measurement of the eccentricity of the inner mold and the outer mold by using the coarse measurement assembly in the embodiment of the present application. Fig. 2 is a schematic view of the measurement of the eccentricity of the inner mold and the outer mold by using the fine measurement assembly in the embodiment of the present application. Fig. 3 is a sectional view of the coarse measurement assembly of the embodiment of the present application. Fig. 4 is a sectional view of the fine measurement assembly of the embodiment of the present application. DETAILED DESCRIPTION
[0030] The present application will be further described in detail below with reference to the accompanying drawings. Figures 1-3 The present application will be further described in detail below with reference to the accompanying drawings.
[0031] The embodiment of the present application discloses a device for measuring the eccentricity of the inner mold and the outer mold of an extruder. Referring to Figure 1, the head of the extruder comprises a base, an inner mold 1 is fixedly arranged in the base, an outer mold 2 is arranged on the outer side of the inner mold 1, the inner mold 1 is hollow and used for penetrating the cable core to be extruded, the inner diameter of the outer mold 2 is larger than the outer diameter of the inner mold 1, and the gap between the inner mold 1 and the outer mold 2 is a high-temperature extrusion channel. The inner-outer mold eccentricity measuring device provided by the embodiment of the application is used for measuring the eccentricity of the inner mold 1 and the outer mold 2 when the cable core does not penetrate the hole of the inner mold 1.
[0032] With reference to Figure 1 and Figure 2 , the inner-outer mold eccentricity measuring device of the extruder comprises a centering shaft 5, a rough measurement assembly 3 and a precise measurement assembly 4; wherein the rough measurement assembly 3 is suitable for rapid rough measurement of the eccentricity of the inner mold 1 and the outer mold 2, and the precise measurement assembly 4 is suitable for accurate measurement of the eccentricity of the inner mold 1 and the outer mold 2.
[0033] With reference to Figure 1 and Figure 2 , the centering shaft 5 is in a cylindrical shape, the diameter of the centering shaft 5 is the same as the inner diameter of the inner mold 1, one end of the centering shaft 5 is arranged in the hole of the inner mold 1, and the other end of the centering shaft 5 is located outside the inner mold 1. An annular limiting boss 54 is arranged on the outer periphery of the middle section of the centering shaft 5, the limiting boss 54 abuts against the hole of the inner mold 1, and this helps to avoid axial relative sliding between the centering shaft 5 and the inner mold 1 during the measurement process. In order to facilitate the adjustment and retention of the position of the centering shaft 5 during the measurement, a handle 51 is fixedly connected to the end of the centering shaft 5 located outside the inner mold 1.
[0034] With reference to Figure 1 , the rough measurement assembly 3 comprises a tapered sleeve 31 which is sleeved on the centering shaft 5 in a sliding manner, the tapered sleeve 31 is provided with a through hole in the axial direction of the tapered sleeve 31, the through hole is divided into a large-diameter section and a small-diameter section with different inner diameters, the inner diameter of the large-diameter section is slightly larger than the outer diameter of the inner mold 1, and the inner wall of the small-diameter section abuts against the outer wall of the centering shaft 5, that is, the inner diameter of the small-diameter section is the same as the diameter of the centering shaft 5.
[0035] With reference to Figure 1 , a sliding groove 53 is arranged on the side wall of the end of the centering shaft 5 located outside the inner mold 1, the length direction of the sliding groove 53 is parallel to the axial direction of the centering shaft 5; a radial hole 314 is arranged on the centering shaft 5 in the radial direction of the centering shaft 5, and a rotation prevention pin 32 is fixedly arranged in the radial hole 314, and the end of the rotation prevention pin 32 is located in the sliding groove 53. When the tapered sleeve 31 slides along the centering shaft 5, the rotation prevention pin 32 slides along the sliding groove 53, which helps to avoid relative rotation between the tapered sleeve 31 and the centering shaft 5.
[0036] With reference to Figure 1The outer wall of one end of the tapered sleeve 31 is a conical surface 311, meaning the outer diameter of the tapered sleeve 31 gradually decreases from the middle to the end. The minimum and maximum diameters of the conical surface 311 are smaller and larger than the inner diameter of the outer mold 2, respectively. The conical surface 311 is provided with markings, including multiple annular diameter markings 312 spaced along the axial direction of the conical surface 311 to indicate diameter; and multiple straight angle markings 313 spaced circumferentially along the conical surface 311 to indicate angle. One of the angle markings 313 is marked as zero. The anti-rotation pin 32 and the angle marking 313 with a zero angle value are located at both ends of the radial direction of the tapered sleeve 31.
[0037] Reference Figure 1 A directional arrow 52 is provided at one end of the centering shaft 5 located outside the inner mold 1. The directional arrow 52 is arranged radially along the centering shaft 5. The slide groove 53 and the directional arrow 52 are located at both ends of the radial direction of the centering shaft 5, respectively. A vertical engraving line 21 is provided at the end of the outer mold 2. The vertical engraving line 21 is arranged radially along the outer mold 2.
[0038] The method for measuring the eccentricity between the inner mold 1 and the outer mold 2 using the aforementioned coarse measuring component 3 is as follows:
[0039] First, insert the centering shaft 5 into the hole of the inner mold 1, so that the limiting boss 54 abuts against the opening of the inner mold 1. Rotate the centering shaft 5 through the handle 51 to keep the directional arrow 52 of the centering shaft 5 aligned with the vertical engraving line 21 at the end of the outer mold 2.
[0040] Then, slowly insert the conical sleeve 31 onto the centering shaft 5, so that the thin-walled end of the conical sleeve 31 is inserted into the gap between the inner mold 1 and the outer mold 2. During this process, the inner mold 1, the centering shaft 5, and the conical sleeve 31 are coaxial. The anti-rotation pin 32 slides into the groove 53 to prevent rotation, ensuring that the vertical marking line 21, the azimuth arrow 52, and the angle marking line 313 with zero angle value are aligned. Slowly insert the conical sleeve 31 until a point on the conical surface 311 of the outer wall of the conical sleeve 31 contacts the opening of the outer mold 2. Figure 3 As shown, the contact point is A. At this time, the diameter value corresponding to the end face of the outer mold 2 orifice (i.e., the radial plane where contact point A is located) on the diameter mark line 312 is: d The angle value corresponding to contact point A on angle mark 313 is: θ .
[0041] Given the known inner diameter of the two holes in the outer mold D ,according to Figure 3 The schematic diagram shown shows the calculation of the inner mold 1 axis. With the outer mold 2 axis Eccentricity between e The value is:
[0042] ,
[0043] and inner mold 1 axis With the outer mold 2 axis Eccentricity value in the horizontal direction for:
[0044] ,
[0045] Inner mold 1 axis With the outer mold 2 axis Eccentricity value in the vertical direction for:
[0046] ,
[0047] Therefore, only the horizontal displacement of the outer mold 2 needs to be adjusted. and vertical displacement of outer mold 2 This allows the inner mold 1 and the outer mold 2 to be adjusted to be coaxial.
[0048] In actual measurement, the contact point A between the orifice of the outer mold 2 and the conical surface 311 of the outer wall of the conical sleeve 31 is difficult to distinguish accurately with the naked eye. In this case, a layer of red lead oil can be applied to the orifice of the outer mold 2 first, and then the conical sleeve 31 can be slowly inserted until the conical surface 311 of the conical sleeve 31 contacts the orifice of the outer mold 2. Then the conical sleeve 31 can be pulled out. At this time, the point on the conical surface 311 of the outer wall of the conical sleeve 31 where the red lead oil is stuck is the contact point A between the orifice of the outer mold 2 and the conical surface 311. The diameter value can be obtained more accurately by reading the corresponding diameter mark line 312 and angle mark line 313 at this point. d and angle value θ .
[0049] Additionally, a small feeler gauge can be used to test the fit between the conical surface 311 of the outer wall of the cone sleeve 31 and the opening of the outer mold 2. Figure 3 Maximum gap value b The inner mold axis can also be obtained quickly. With the outer mold 2 axis Eccentricity between e value: e = b / 2.
[0050] The above method of using coarse measuring component 3 to coarsely measure the eccentricity of inner mold 1 and outer mold 2 is simple and convenient. However, it is affected by the surface quality of the outer edge of the inner hole of outer mold 2, as well as the identification error of the contact point A between the hole of outer mold 2 and the conical surface 311 of tapered sleeve 31. In addition, the reading error caused by the discontinuity of the diameter marking line 312 and the angle marking line 313 on the conical surface 311 of tapered sleeve 31 makes it difficult to accurately measure the eccentricity of inner mold 1 and outer mold 2.
[0051] In order to further accurately and quickly measure the eccentricity of the inner mold 1 and the outer mold 2, on the basis of the rough measurement of the rough measurement assembly 3, the embodiment of the application further provides a fine measurement assembly 4.
[0052] Referring to Figure 2 , the fine measurement assembly 4 comprises a rotary seat 41 rotatably sleeved on the centering shaft 5, and a measuring device for measuring the eccentricity of the outer mold 2 and the inner mold 1 is installed on the rotary seat 41. Specifically, the measuring device comprises a small lever dial gauge 42 installed on the rotary seat 41, the rotary seat 41 is provided with a dial gauge mounting hole 411 for mounting the small lever dial gauge 42, and the rotary seat 41 is further provided with a clamping screw 43 for fixing the small lever dial gauge 42. The measuring head of the small lever dial gauge 42 is parallel to the axial direction of the outer mold 2, and abuts against the inner wall of the hole of the outer mold 2, and the end face of the rotary seat 41 is provided with an end face angle scale 412.
[0053] The specific method for measuring by using the fine measurement assembly 4 is as follows:
[0054] Firstly, the centering shaft 5 is inserted into the hole of the inner mold 1, so that the limiting boss 54 abuts against the hole of the inner mold 1, and the orientation arrow 52 of the centering shaft 5 is aligned with the vertical scale line 21 at the end of the outer mold 2.
[0055] Then, the rotary seat 41 is sleeved on the centering shaft 5, so that the end of the rotary seat 41 abuts against the limiting boss 54 of the centering shaft 5. The small lever dial gauge 42 is installed in the dial gauge mounting hole 411 at a proper position and locked by the clamping screw 43, and then the measuring head of the small lever dial gauge 42 is adjusted so as to lightly press the inner wall of the hole of the outer mold 2.
[0056] Subsequently, the centering shaft 5 is kept stationary, and the rotary seat 41 is slowly rotated for one circle in the state that the end face of the rotary seat 41 abuts against the limiting boss 54, and the difference between the maximum value and the minimum value of the reading of the small lever dial gauge 42 is recorded during the rotation process c , and the angle reading on the end face angle scale 412 of the rotary seat 41 pointed by the orientation arrow 52 of the centering shaft 5 when the maximum and minimum readings of the small lever dial gauge 42 are respectively recorded and , that is, the eccentricity between the axial center of the inner mold 1 and the axial center of the outer mold 2 e = c / 2 and the angular displacement between the axial center of the inner mold 1 and the axial center of the outer mold 2 .
[0057] After the eccentricity and the angular displacement of the inner mold 1 and the outer mold 2 are measured by using the fine measurement assembly, the radial position of the outer mold 2 can be quickly and accurately adjusted according to the measurement results, so that the concentricity of the inner mold 1 and the outer mold 2 meets the production requirements.
[0058] The above are all preferred embodiments of the present application, and do not limit the protection scope of the present application, so that: all equivalent changes made according to the structure, shape, principle of the present application should be covered in the protection scope of the present application.
Claims
1. A device for measuring eccentricity of an inner and outer die of an extruder, characterized by: The centering axle, the rough measurement assembly and the accurate measurement assembly are included. The centering axle is arranged in the hole of the inner mold and one end of the centering axle is located outside the inner mold. The rough measurement assembly includes a taper sleeve which is sleeved on the centering axle, the taper sleeve is provided with a through hole along the axial direction of the taper sleeve, the through hole is divided into a large diameter section and a small diameter section with different inner diameters, the inner diameter of the large diameter section is larger than the outer diameter of the inner mold, and the inner wall of the small diameter section abuts against the outer wall of the centering axle. The accurate measurement assembly includes a rotary seat which is rotatably sleeved on the centering axle, and the rotary seat is provided with a measuring device for measuring the eccentricity between the inner mold and the outer mold.
2. A device for measuring eccentricity of an inner and outer die of an extrusion machine according to claim 1, characterized in that: The outer periphery of the centering axle is provided with a limiting boss which abuts against the hole of the inner mold.
3. A device for measuring eccentricity of an inner and outer die of an extrusion machine according to claim 1, characterized in that: One end of the centering axle located outside the inner mold is fixedly connected with a handle.
4. A device for measuring eccentricity of an inner and outer die of an extrusion machine according to claim 3, characterized in that: The side wall of the end of the centering axle located outside the inner mold is provided with a sliding groove, the length direction of the sliding groove is parallel to the axial direction of the centering axle, the taper sleeve is provided with an anti-rotation pin which penetrates through the taper sleeve along the radial direction of the taper sleeve, and the end of the anti-rotation pin is located in the sliding groove.
5. A device for measuring eccentricity of an inner and outer die of an extrusion machine according to claim 4, characterized in that: The end of the centering axle located outside the inner mold is provided with a direction arrow which is arranged along the radial direction of the centering axle, and the end of the outer mold is provided with a vertical scale line which is arranged along the radial direction of the outer mold.
6. A die eccentricity measuring device for an extrusion machine as defined in claim 5, wherein: The sliding groove and the direction arrow are respectively located at two ends of the radial direction of the centering axle.
7. A device for measuring eccentricity of an inner and outer die of an extrusion machine according to claim 6, characterized in that: The scale line includes a plurality of annular diameter scale lines which are arranged along the axial direction of the conical surface.
8. A die eccentricity measuring device for an extrusion machine as defined in claim 7, wherein: The scale line further includes a plurality of linear angle scale lines which are arranged along the circumferential direction of the conical surface, and one of the plurality of linear angle scale lines is marked as zero.
9. A die eccentricity measuring device for an extrusion machine as defined in claim 8, wherein: The anti-rotation pin and the angle scale line marked as zero are respectively located at two ends of the radial direction of the taper sleeve.
10. A device for measuring eccentricity of an inner and outer die of an extrusion machine according to claim 5, characterized in that: The measuring device includes a small lever dial gauge which is installed on the rotary seat, the measuring head of the small lever dial gauge abuts against the inner wall of the hole of the outer mold, and the end of the rotary seat is provided with an end face angle scale line.