Cable insulation processing equipment

Abstract

This invention discloses a cable insulation processing apparatus, comprising: a cylinder with a feed inlet on its wall; a screw extending from the rear end of the cylinder to the front end, the front end of the screw being fitted with an inner mold, and the front end of the cylinder being fitted with an outer mold, the outer mold and the inner mold defining a discharge outlet; a driver for driving the screw to rotate; a spirally extending spiral blade formed on the screw, the spiral blade being formed into a first equidistant section, a variable-pitch section, and a second equidistant section from the rear end to the front end of the screw; a first pressure buffer mechanism provided on the screw, the first pressure buffer mechanism including a valve component disposed on the spiral blade in the first equidistant section; the valve component is configured such that: the valve component has a natural state matching the surface of the spiral blade in its adjacent area and a torsional state formed by twisting in a direction with a smaller helix angle in response to the pressure of the material; the valve component releases part of the pressure of the material downstream of the valve component by switching to the torsional state.

Description

Technical Field

[0001] This invention relates to the field of cable manufacturing equipment technology, and in particular to a cable insulation processing device. Background Technology

[0002] The insulation of cables is usually formed by extrusion molding using a cable insulation processing device. This insulation processing device typically includes a cylinder, a screw extending into the cylinder and coaxially arranged with the cylinder, a driver (e.g., a motor) located at the rear end of the cylinder in the axial direction for driving the screw to rotate, an inner mold installed at the front end of the screw, and an outer mold installed at the front end of the cylinder. The outer mold and the inner mold define the discharge port, and a feed port is provided on the cylinder wall near the rear end of the cylinder.

[0003] The screw is equipped with axially spirally extending spiral blades. During use, the driver drives the screw so that the spiral blades convey the molten material falling into the cylinder from the feed port forward. The conveying by the screw creates a certain pressure on the molten material before it is squeezed out from the discharge port, so that the material is squeezed out from the discharge port to form a tubular, dense insulating skin.

[0004] Therefore, it can be seen that the screw rotation, through the spiral blades, is not only used to transport materials, but also to create a certain pressure in the materials before they are extruded. Consequently, it can be concluded that the pressure of the material located behind the screw is less than the pressure located in front of the screw.

[0005] However, using a screw to transport materials and build up pressure has the following serious drawbacks in the following situations.

[0006] If a material with a poor melting state (i.e., a material with high viscosity due to low temperature) is conveyed to the front of the screw, a pressure fluctuation of the type of pressure increase will occur at the front of the screw. This pressure fluctuation usually leads to the following situation:

[0007] The driving force of the driver increases the torque in response to pressure fluctuations, which further increases the pressure of the material on the front side of the screw, which easily leads to an increase in the discharge speed at the discharge port, and consequently a decrease in the thickness of the extruded insulation.

[0008] Therefore, it is necessary to design a structure to mitigate the aforementioned pressure fluctuations. Summary of the Invention

[0009] In view of the above-mentioned technical problems existing in the prior art, the present invention provides a cable insulation processing device.

[0010] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0011] A cable insulation processing apparatus, comprising:

[0012] The cylinder has a feed inlet on its wall near the rear end;

[0013] A screw extends from the rear end of the cylinder to the front end of the cylinder and is coaxially arranged with the cylinder. An inner mold is installed at the front end of the screw, and an outer mold is installed at the front end of the cylinder. The outer mold and the inner mold define a discharge port.

[0014] A driver, disposed at the rear end of the cylinder, is used to drive the screw to rotate; wherein:

[0015] The screw has a spirally extending spiral blade. From the rear end to the front end of the screw, the spiral blade is formed into a first equidistant section, a variable pitch section, and a second equidistant section. The pitch and helix angle of the second equidistant section are both smaller than those of the first equidistant section, and the pitch and helix angle of the variable pitch section are both between those of the first equidistant section and the second equidistant section.

[0016] The screw is provided with a first pressure buffer mechanism, which includes a valve component disposed on the spiral blades of the first equidistant section; the valve component is configured as follows:

[0017] The valve component has a natural state that matches the surface of the spiral blades in its adjacent region, and a torsional state formed by twisting in a direction with a smaller helix angle in response to the pressure of the material; the valve component releases part of the pressure of the material downstream of the valve component by switching to the torsional state.

[0018] Preferably, a door frame is formed on the spiral blade of the first equidistant segment, a first countersunk hole is formed at the bottom of the door frame, a second countersunk hole is formed at the top of the door frame, and a polygonal hole is formed at the bottom of the first countersunk hole.

[0019] The valve component includes a valve body, an upper positioning post formed on the top of the valve body, and a lower protruding post formed on the bottom of the valve body. The lower protruding post includes, from top to bottom, a lower positioning post, a spring post, and a polygonal prism.

[0020] The polygonal prism is inserted into the polygonal hole, the lower positioning post and the spring post are located in the first countersunk hole, and the upper positioning post is inserted into the second countersunk hole; the spring post is used to provide torsional damping for the valve body and to provide reset for the valve body.

[0021] Preferably, the two sides of the door frame in the circumferential direction are constructed as two parallel inclined surfaces; the two sides of the door body in the circumferential direction are constructed as two parallel inclined surfaces, and the inclined surfaces of the sides of the door body fit with the inclined surfaces of the door frame to restrict the door body from twisting in the direction that increases the helix angle.

[0022] Preferably, the screw is provided with a second pressure buffer mechanism, the second pressure buffer mechanism including a deflection channel constructed between the second equidistant section and the first equidistant section; the deflection channel extends axially along the mandrel of the screw; wherein:

[0023] The front port of the folding flow channel extends radially to the outer peripheral surface of the mandrel between the spiral blades of the second equidistant section, and the rear port of the folding flow channel extends to the outer peripheral surface of the mandrel between the spiral blades of the first equidistant section.

[0024] A one-way valve is installed at the front port, which allows material in the second equidistant section to enter the reversing flow channel, while blocking it in the reverse direction.

[0025] Preferably, the one-way valve includes:

[0026] The valve body has a valve cavity inside, a conical valve port is formed at the front end of the valve cavity, and circumferentially arranged guide grooves are formed on the cavity wall of the valve cavity.

[0027] A spherical valve core is disposed in the valve cavity and is used to block the conical valve port or open the conical valve port;

[0028] A spring, disposed in the valve cavity and used to push the valve core toward the conical valve orifice; wherein:

[0029] The rear end of the valve body is configured as a joint, and the spindle has a radially extending mounting hole. The joint extends into the mounting hole and screws into the mounting hole.

[0030] Preferably, the front port of the foldback channel includes multiple ports, which are arranged circumferentially along the extension direction of the spiral blade, and each front port is equipped with the one-way valve.

[0031] Preferably, the screw is provided with a third pressure buffer mechanism, which includes a notch opened on the radially outer edge of the spiral blade in the variable pitch section and a spring sheet for sealing the notch. The spring sheet is used to open in response to the pressure of the material so that the material in the variable pitch section moves backward through the notch.

[0032] Preferably, the notches include a plurality of notches, which are arranged circumferentially along the extension direction of the spiral blade.

[0033] Compared with the prior art, the advantages of the cable insulation processing apparatus disclosed in this invention are:

[0034] The cable insulation processing apparatus provided by this invention can effectively suppress pressure fluctuations in materials with rising pressure, thereby enabling the processing of insulation sheets of higher quality.

[0035] It should be understood that the foregoing general description and the following detailed description are exemplary and illustrative only, and are not intended to limit the invention.

[0036] The overview of various implementations or examples of the technology described in this invention is not a complete disclosure of the full scope or all features of the disclosed technology. Attached Figure Description

[0037] In drawings that are not necessarily drawn to scale, the same reference numerals may describe similar parts in different views. The same reference numerals with or without letter suffixes may indicate different instances of similar parts. The drawings generally illustrate various embodiments by way of example rather than limitation and, together with the description and claims, serve to explain embodiments of the invention. Where appropriate, the same reference numerals are used in all drawings to refer to the same or similar parts. Such embodiments are illustrative and not intended to be exhaustive or exclusive embodiments of the apparatus or method.

[0038] Figure 1 This is a three-dimensional structural diagram of the screw in the cable insulation processing apparatus provided in an embodiment of the present invention.

[0039] Figure 2 This is a main sectional view of a cable insulation processing apparatus provided in an embodiment of the present invention.

[0040] Figure 3 for Figure 2 A sectional view along line AA (the valve body is in its natural state).

[0041] Figure 4 for Figure 2 A sectional view along line AA (the valve body is in a torsional state).

[0042] Figure 5 This is a three-dimensional structural diagram of the valve component in the cable insulation processing apparatus provided in an embodiment of the present invention.

[0043] Figure 6 for Figure 2 BB-direction sectional view.

[0044] Figure 7 for Figure 2 A magnified view of part C.

[0045] Figure 8 This is a schematic diagram of the external structure of the one-way valve in the cable insulation processing apparatus provided in an embodiment of the present invention.

[0046] Figure 9 This is a perspective sectional view of the one-way valve in the cable insulation processing apparatus provided in an embodiment of the present invention.

[0047] Figure label:

[0048] 10-Screw; 11-Mandrel; 111-Mounting hole; 12-Helical blade; 121-First equidistant section; 122-Variable pitch section; 123-Second equidistant section; 21-Valve component; 211-Valve body; 212-Upper positioning post; 213-Lower protruding post; 2131-Lower positioning post; 2132-Spring post; 2133-Polygonal prism; 31-One-way valve; 311-Valve body; 312-Valve cavity; 313-Spring; 314-Spherical valve core; 315-Conical valve port; 316-Guide groove; 317-Joint; 32-Reverse flow channel; 321-Front port; 322-Rear port; 40-Cylinder; 41-Inlet; 42-Outlet; 50-Driver; 60-Inner mold; 70-Outer mold. Detailed Implementation

[0049] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0050] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0051] To keep the following description of the embodiments of the present invention clear and concise, detailed descriptions of known functions and known components are omitted.

[0052] like Figure 1 and Figure 2 As shown, an embodiment of the present invention discloses a cable insulation processing device. The processing device uses an extrusion process to extrude the insulation sheath of the cable. The processing device includes: a cylinder 40, a screw 11, a driver 50, an inner mold 60, and an outer mold 70.

[0053] The cylinder 40 has a cylindrical inner cavity. The screw 11 extends from the rear end of the cylinder 40 to the front end of the cylinder 40 and is coaxially arranged with the cylinder 40. The screw 11 includes a spindle 11 and a spiral blade 12 integrally formed on the spindle 11 and extending spirally in the axial direction. The spiral blade 12 and the cavity wall of the cylindrical inner cavity of the cylinder 40 form a spiral conveying channel. A driver 50, such as a motor, is installed at the rear end of the cylinder 40 to drive the screw 11 to rotate. An inner mold 60 is installed at the front end of the screw 11, and an outer mold 70 is installed at the front end of the cylinder 40. The outer mold 70 and the inner mold 60 define an outlet 42 located at the front end of the spiral conveying channel. An inlet 41 is provided on the cylinder wall near its rear end. In use, the molten material enters the spiral conveying channel inside the cylinder 40 through the feed port 41. The rotating screw 11 drives the material to move toward the front end in a spiral manner, and the spiral blades 12 of the screw 11 are used to provide feeding force to the material. This feeding force makes the pressure greater the closer the material is to the front end of the cylinder 40, so that the material is finally squeezed out from the discharge port 42 to form a tubular insulating skin.

[0054] In this invention:

[0055] The spiral blade 12 is formed in three segments from the rear end to the front end: a first equidistant segment 121, a variable pitch segment 122, and a second equidistant segment 123. The pitch and helix angle of the spiral blade 12 in the first equidistant segment 121 remain constant and are greater than the pitch and helix angle of the variable pitch segment 122 and the second equidistant segment 123. The pitch and helix angle of the spiral blade 12 in the second equidistant segment 123 remain constant and are smaller than the pitch and helix angle of the variable pitch segment 122 and the first equidistant segment 121. The pitch and helix angle of the spiral blade 12 in the variable pitch segment 122 gradually decrease from front to back and are smaller than those in the first equidistant segment 121 and larger than those in the second equidistant segment 123.

[0056] The screw 11 is provided with a first pressure buffer mechanism, a second pressure buffer mechanism and / or a third pressure buffer mechanism.

[0057] like Figures 3 to 5 and combined Figure 1 and Figure 2As shown, a first pressure buffer mechanism is disposed on the spiral blade 12 of the first equidistant section 121. Specifically, the first pressure buffer mechanism includes a valve component 21, which includes a valve body 211, an upper positioning post 212 formed on the top of the valve body 211, and a lower protruding post 213 formed on the bottom of the valve body 211. The lower protruding post 213 includes, from top to bottom, a lower positioning post 2131, a spring post 2132, and a polygonal prism 2133. A door frame is formed on the spiral blade 12 of the first equidistant section 121. A first countersunk hole is formed at the bottom of the door frame, and a second countersunk hole is formed at the top of the door frame. A polygonal hole is formed at the bottom of the first countersunk hole. The polygonal prism 2133 is inserted into the polygonal hole, the lower positioning post 2131 and the spring post 2132 are located in the first countersunk hole, and the upper positioning post 212 is inserted into the second countersunk hole. The valve body 211 is configured to align with the surface of the spiral blade 12 of the first equidistant segment 121, and the two circumferential sides of the door frame are constructed with two parallel inclined surfaces; the two circumferential sides of the valve body 211 are constructed with two parallel inclined surfaces, and the inclined surfaces of the sides of the valve body 211 fit into the inclined surfaces of the door frame. Thus, under the torsional force of the spring column 2132, the valve body 211 and the spiral blade 12 form a certain posture, in which, as... Figure 3 As shown, the valve body 211 is part of the spiral blade 12, and is used to convey materials and apply pressure to the materials so that the materials move forward at a certain pressure. The state of the valve body 211 at this time can be called the natural state. That is to say, when the valve body 211 is in the natural state, the valve body 211 is used as part of the spiral blade 12 to convey materials and pressurize the materials.

[0058] However, when the pressure of the material in the spiral conveying channel defined by the spiral blade 12 downstream of the valve component 21 suddenly increases, for example, when the pressure becomes too high due to increased viscosity caused by the low temperature of the molten material, such as... Figure 4 As shown, the material overcomes the elastic force of the spring column 2132, forcing the valve body 211 to twist in the direction of decreasing helix angle. After the valve body 211 twists, on the one hand, the pushing speed of the material is reduced due to the decrease in the helix angle at the position of the valve body 211. On the other hand, the material can flow backward from the gap between the valve body 211 and the door frame. Under the action of these two aspects, the pressure of the material in the spiral conveying channel downstream of the valve body 211 is released, and the pressure release of the material closer to the valve body 211 is more sufficient, thereby reducing the pressure fluctuation of the material to a certain extent.

[0059] In some preferred embodiments, a plurality of valve components 21 are provided on the spiral blade 12 of the first equidistant segment 121, and the plurality of valve components 21 are arranged circumferentially on the spiral blade 12.

[0060] like Figure 6 and combined Figure 1 and Figure 2 As shown, the second pressure buffer mechanism includes a reversible flow channel 32 and a one-way valve 31. The reversible flow channel 32 is established between the second equidistant end and the first equidistant section 121. Specifically, the reversible flow channel 32 extends axially along the spindle 11 of the screw 11. The front port 321 of the reversible flow channel 32 radially extends to the outer peripheral surface of the spindle 11 between the spiral blades 12 of the second equidistant section 123, and the rear port 322 of the reversible flow channel 32 extends to the outer peripheral surface of the spindle 11 between the spiral blades 12 of the first equidistant section 121. The one-way valve 31 is installed at the front port 321. The one-way valve 31 allows material in the second equidistant section 123 to enter the reversible flow channel 32, so that the material can return to the area where the first equidistant section 121 is located through the reversible flow channel 32, while restricting the material in the reversible flow channel 32 from entering the second equidistant section 123.

[0061] If the pressure effect of the second pressure buffer mechanism on the material far from the first equidistant section 121 is small, while the pressure in the second equidistant section 123 is still too large, then the one-way valve 31 of the second pressure buffer mechanism opens in response to the excessive pressure, thereby allowing the material in the second equidistant section 123 to flow towards the first equidistant section 121 through the return flow channel 32, thereby releasing the pressure of the material in the second equidistant section 123 to a certain extent.

[0062] This invention provides a preferred structure for a one-way valve 31. For example... Figure 8 and Figure 9 As shown, the one-way valve 31 includes: a valve body 311, a ball valve core 314, and a spring 313. A valve cavity 312 is formed inside the valve body 311, and a conical valve port 315 is formed at the front end of the valve cavity 312. Circumferentially arranged guide grooves 316 are formed on the cavity wall of the valve cavity 312. The ball valve core 314 is disposed in the valve cavity 312 and is used to block the conical valve port 315 or open the conical valve port 315. The spring 313 is disposed in the valve cavity 312 and is used to push the valve core towards the conical valve port 315. The rear end of the valve body 311 is configured as a connecting part 317. A radially extending mounting hole 111 is formed on the spindle 11, and the connecting part 317 extends into the mounting hole 111 and screws into the mounting hole 111. When the pressure is too high, the material pushes backward against the spherical valve core 314, causing the conical valve port 315 to open. Thus, the material flows through the guide channel 316 to the return flow channel 32. This one-way valve 31 does not affect the material flow while radially limiting the spherical valve core 314.

[0063] In some preferred configurations, the front port 321 of the foldback channel 32 includes multiple ports 321 arranged circumferentially along the extension direction of the spiral blade 12, and each front port 321 is equipped with a one-way valve 31.

[0064] like Figure 1 and Figure 2and combined Figure 7 As shown, the third pressure buffer mechanism includes a notch formed on the radially outer edge of the spiral blade 12 in the pitch section 122 and a spring sheet for sealing the notch. The spring sheet opens in response to the pressure of the material, allowing the material in the pitch section 122 to move backward through the notch. Since the spiral blade 12 in the pitch section 122 has the function of increasing the pressure of the material, a third pressure buffer mechanism is provided in the pitch section 122 to suppress excessive pressure increase. Specifically, when the pressure is too high, the material forces the spring sheet to elastically deform, causing the notch to open, and the material moves backward through the notch, thereby releasing the pressure in the pitch section 122. Preferably, there are multiple notches, which are arranged circumferentially along the extension direction of the spiral blade 12.

[0065] Furthermore, although exemplary embodiments have been described in this invention, their scope includes any and all embodiments based on the invention that have equivalent elements, modifications, omissions, combinations (e.g., schemes involving intersections of various embodiments), adaptations, or alterations. Elements in the claims will be interpreted broadly based on the language used in the claims and are not limited to the examples described in this specification or during the implementation of this application, and such examples will be interpreted as non-exclusive. Therefore, this specification and examples are intended to be considered illustrative only, and the true scope and spirit are indicated by the full scope of the following claims and their equivalents.

[0066] The above description is intended to be illustrative and not restrictive. For example, the above examples (or one or more of them) can be used in combination with each other. Other embodiments can be used by those skilled in the art when reading the above description. Furthermore, in the above detailed description, various features may be grouped together to simplify the invention. This should not be construed as an intention that a disclosed feature, which is not claimed, is necessary for any claim. Rather, the subject matter of the invention may be less than all the features of the particular disclosed embodiments. Thus, the following claims are incorporated herein by reference as examples or embodiments, wherein each claim is independently considered as a separate embodiment, and these embodiments are contemplated as being able to be combined with each other in various combinations or arrangements. The scope of the invention should be determined by reference to the appended claims and the full scope of their equivalents.

[0067] The above embodiments are merely exemplary embodiments of the present invention and are not intended to limit the present invention. The scope of protection of the present invention is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to the present invention within its spirit and scope of protection, and such modifications or equivalent substitutions should also be considered to fall within the scope of protection of the present invention.

Claims

1. A cable insulation processing apparatus characterized by comprising: The extruder comprises: a barrel having a feed inlet formed on the barrel wall near the rear end; a screw coaxially arranged in the barrel and extending from the rear end of the barrel to the front end of the barrel, the front end of the screw being provided with an inner die, and the front end of the barrel being provided with an outer die, the outer die and the inner die defining a discharge outlet; a driver arranged at the rear end of the barrel for driving the screw to rotate; wherein: the screw is provided with helical blades extending helically on the screw, the helical blades being formed into a first equidistance section, a variable-pitch section and a second equidistance section from the rear end to the front end of the screw, the pitch and helix angle of the second equidistance section being smaller than those of the first equidistance section, and the pitch and helix angle of the variable-pitch section being between those of the first equidistance section and those of the second equidistance section; the screw is provided with a first pressure buffering mechanism, the first pressure buffering mechanism comprising a valve member arranged on the helical blades of the first equidistance section; the valve member being configured to: have a natural state matching the surface of the helical blades in the adjacent area of the valve member and a twisted state formed by twisting the valve member in the direction of smaller helix angle in response to the pressure of the material; the valve member releasing part of the pressure of the material downstream of the valve member by switching to the twisted state.

2. The cable insulation processing apparatus of claim 1, wherein the helical blades of the first equidistance section are provided with a door frame, the bottom of the door frame is provided with a first counterbore, the top of the door frame is provided with a second counterbore, and the bottom of the first counterbore is provided with a multi-rib hole; the valve member comprises a valve body, an upper positioning column formed on the top of the valve body, and a lower convex column formed on the bottom of the valve body, the lower convex column comprising a lower positioning column, a spring column and a multi-rib column from top to bottom; the multi-rib column is inserted into the multi-rib hole, the lower positioning column and the spring column are located in the first counterbore, and the upper positioning column is inserted into the second counterbore; the spring column is used to provide torsional damping for the valve body and to provide reset for the valve body.

3. The cable insulation processing apparatus of claim 2, wherein the two sides in the circumferential direction of the door frame are configured as two parallel inclined surfaces; the two sides in the circumferential direction of the valve body are configured as two parallel inclined surfaces, and the inclined surfaces of the sides of the valve body are matched with the inclined surfaces of the door frame to limit the twisting of the valve body in the direction of increasing helix angle.

4. The cable insulation processing apparatus of claim 1, wherein the screw is provided with a second pressure buffering mechanism, the second pressure buffering mechanism comprising a U-turn flow channel configured between the second equidistance section and the first equidistance section; the U-turn flow channel extending along the axial direction of the core shaft of the screw; wherein: the front end of the U-turn flow channel penetrates the outer peripheral surface of the core shaft between the helical blades of the second equidistance section in the radial direction, and the rear end of the U-turn flow channel penetrates the outer peripheral surface of the core shaft between the helical blades of the first equidistance section; a one-way valve is arranged at the front end, the one-way valve allowing the material in the second equidistance section to enter the U-turn flow channel while being reversely cut off.

5. The cable insulation processing apparatus of claim 4, wherein the one-way valve comprises: a valve body having a valve cavity formed therein, a tapered valve port being formed at the front end of the valve cavity, and a plurality of flow guide grooves being arranged circumferentially on the cavity wall of the valve cavity; A ball valve core is arranged in the valve cavity and used for blocking or opening the conical valve port; A spring is arranged in the valve cavity and used for pushing the valve core towards the conical valve port; wherein: The rear end of the valve body is configured as a joint part, a mounting hole extending in a radial direction is formed on the core shaft, and the joint part extends into the mounting hole and is screwed with the mounting hole.

6. The cable insulation processing apparatus of claim 4, wherein The front ports of the return flow channel include a plurality of front ports, and the plurality of front ports are arranged in a circumferential direction along the extension direction of the spiral blade. Each of the front ports is provided with the one-way valve.

7. The cable insulation processing apparatus of claim 1, wherein The screw rod is provided with a third pressure buffering mechanism. The third pressure buffering mechanism includes a notch formed on a radially outer edge of the spiral blade of the variable pitch section and a spring used for blocking the notch. The spring is used for being opened in response to the pressure of the material to enable the material at the variable pitch section to move backward through the notch.

8. The cable insulation processing apparatus of claim 7, wherein, The notch includes a plurality of notches, and the plurality of notches are arranged in a circumferential direction along the extension direction of the spiral blade.

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