A rubber tube extruder head
By adopting multi-stage splitting and spiral flow channel groove structure in the rubber extruder head and combining annular boosting technology, the problem of uneven distribution of the rubber annular material is solved, the quality stability of rubber products is improved and the radial direction is eliminated Risk of tearing.
Patent Information
- Application Number
- CN202411345200.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-26
- Publication Date
- 2024-12-31
- Estimated Expiration
- 2044-09-26
AI Technical Summary
Due to the effect of the rubber weight, the rubber extruder head has uneven distribution of the rubber circumference, which affects the quality of rubber products.
Using multi-stage shunt and spiral flow channel groove structure, the independent flow is formed through first-stage shunt and multi-stage shunt to reduce gravity influence, and the glue is made in the spiral flow channel groove by gradually reducing the groove depth and increasing the groove width. During the flow process, the annular discharge is uniformly spread out, and the annular boost is performed at the outlet of the runner to ensure uniform distribution of the glue.
It effectively solves the problems of uneven distribution of rubber products in annular direction and mold clamping lines, improves the stability of product quality, and eliminates the hidden danger of radial tear.
Smart Images
Figure CN118849375B_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the field of rubber extruders, and in particular relates to a rubber tube extruder head. Background Art
[0002] A rubber extruder is a device that heats rubber to a molten fluid state and extrude it from front to back along the flow channel inside the extruder, so that the rubber is extruded into various desired shapes. The rubber extruder head is the basic shaping component of the rubber extruder, which is set at the very end of the rubber extruder. The shape of the rubber extruder head determines the shape of the final rubber product. The rubber extruder is usually horizontal, that is, the rubber inlet and extrusion port of the rubber extruder are basically in the horizontal direction, and the flow channel is set in the horizontal direction. Due to the deadweight of the rubber, under normal circumstances, the pressure of the rubber above the flow channel will be less than the pressure of the rubber below the flow channel, resulting in uneven pressure in the flow channel, which leads to uneven distribution of the circumferential material at the rubber extrusion port, affecting the quality of the rubber product. Summary of the invention
[0003] The purpose of the present invention is to solve the problem that the rubber extruder head extrude horizontally, due to the self-weight of the rubber, the rubber material is unevenly distributed in the annular direction, which affects the quality of the rubber product. A rubber tube extruder head is provided, which can make the rubber inside the rubber extruder head evenly distributed through inlet adjustment, multi-stage diversion, outlet pressurization and the like, thereby improving the stability of product quality.
[0004] The technical solution adopted by the present invention to solve its technical problems is: a rubber tube extruder head, including a head body, a middle hole is provided in the head body, the inner wall of the middle hole is used as the outer wall of the flow channel, a core shaft is inserted at the middle hole, a flow channel groove is provided on the surface of the core shaft, and the flow channel outer wall and the flow channel groove constitute a flow channel structure, a glue feeding end cover is provided at one end of the head body for glue feeding, a side glue feeding flange is provided on one side of the splicing surface of the head body and the glue feeding end cover, a first glue channel and a second glue channel are provided between the side glue feeding flange and the core shaft along the splicing surface of the head body and the glue feeding end cover, a flow channel starting point groove is provided on the side wall of the core shaft, which is aligned with the end of the first glue channel and the end of the second glue channel, respectively, the flow channel starting point groove is connected to multiple levels of herringbone grooves for successive diversion and then connected to a plurality of spiral flow channel grooves one by one, each level of herringbone groove is divided according to 1:2, and each spiral flow channel groove converges at the rear end of the core shaft and is connected to the extrusion port.
[0005] The extruder head is used horizontally, that is, the mandrel is in a horizontal state, so the flow channel structure is basically horizontal rubber extrusion, and the circumferentially symmetrical flow channel on the mandrel is divided into upper and lower parts, which will be affected by the deadweight of the rubber and cause circumferential unevenness. When this device is used, the rubber entering the mandrel flow channel groove from the first rubber channel and the rubber entering the mandrel flow channel structure from the second rubber channel are divided into one level, and then the herringbone grooves of each level are divided into twos, and finally divided into each spiral flow channel groove for independent flow, which minimizes the influence of gravity on the rubber during the flow process and causes unevenness up and down. In addition, the spiral flow channel groove increases the length of the flow channel, and with the structure of the spiral flow channel groove with a gradually decreasing groove depth and a gradually increasing groove width from front to back, the rubber is evenly spread out in the spiral flow channel groove in the circumferential direction, and after converging at the rear end of the spiral flow channel groove, a uniform distribution in the circumferential direction can be quickly formed.
[0006] Preferably, the glue inlet end cap is aligned with the first glue path and is provided with a first glue inlet adjusting bolt, and the glue inlet end cap is aligned with the second glue path and is provided with a second glue inlet adjusting bolt. The first glue inlet adjusting bolt and the second glue inlet adjusting bolt can adjust the glue inlet amount of the first glue path and the second glue path, so that the flow rate of the first glue path and the second glue path converges under the influence of gravity.
[0007] Preferably, the starting groove of the flow channel is connected to a primary herringbone groove, the two ends of the primary herringbone groove are respectively connected to secondary herringbone grooves, the ends of the secondary herringbone grooves are respectively connected to spiral flow channel grooves, and 8 spiral flow channel grooves are evenly arranged around the circumference of the core shaft.
[0008] Preferably, the groove depth of the spiral flow channel groove gradually decreases along the flow channel direction, and a spiral partition is provided between adjacent spiral flow channel grooves, the thickness of the partition gradually decreases along the flow channel direction, and the gap between the top surface of the partition and the outer wall of the flow channel gradually increases along the flow channel direction. When the rubber in the spiral flow channel groove finally converges, the rubber density at the junction of adjacent spiral flow channel grooves will be higher than the rubber density in the middle of the spiral flow channel groove due to the impact of the rubber flow of adjacent spiral flow channel grooves. If it cannot be eliminated, it will expand and bulge after leaving the external pressure of the die head to form axially extending ribs like the parting line on the surface of the product, which seriously affects the quality of the product. Therefore, the present application makes a special design for the structure of the spiral flow channel groove, adopts a structure in which the groove depth gradually decreases, the partition gradually becomes thinner, and the gap between the partition and the outer wall of the flow channel gradually increases, so that the groove bottom is raised and the partition sinks, so that the rubber material is gradually flattened during the transportation along the spiral flow channel groove, and the convergence is gradually increased between the outlet ends of the spiral flow channel groove, thereby eliminating the density difference of the rubber material at the junction of adjacent spiral flow channel grooves and the middle of the spiral flow channel groove to the greatest extent.
[0009] Preferably, the surface of the mandrel is a cone with an outer diameter that gradually decreases from front to back, and the rear end of the mandrel surface is provided with one or more annular protrusions for pressurization, and the annular protrusions are arranged after the confluence position of the spiral flow channel groove and in front of the extrusion port. The pressure of the rubber increases at the annular protrusions because the flow channel gap becomes smaller, and the pressure is released after passing through the annular protrusions. Between the pressure and the release, the rubber can be more evenly distributed in the circumferential direction. The number of pressurization annular protrusions can be selected according to the size of the extruder. The larger the extruder, the more annular protrusions there are. One or more pressurizations are performed after the outlet of the spiral flow channel groove and before the extrusion port to make the rubber extrusion more uniform.
[0010] Preferably, the first glue path is formed by combining two semicircular grooves respectively arranged on the machine head body and the glue inlet end cover, and the second glue path is formed by combining two semicircular grooves respectively arranged on the machine head body and the glue inlet end cover.
[0011] Preferably, the first glue path and the second glue path are both arc-shaped and symmetrically arranged on both sides of the core shaft, and the ends of the first glue path and the second glue path are spaced 180 degrees apart and radially glued on opposite sides of the core shaft.
[0012] Preferably, a triangular cone-shaped flow divider is provided in the side glue inlet flange, the tip of the flow divider faces the inlet end of the side glue inlet flange, and the tip of the flow divider is centrally arranged at the inlet end of the side glue inlet flange, and the two sides of the rear end of the flow divider are respectively connected to the first glue channel and the second glue channel. In this device, since the rubber material fed into the side glue inlet flange needs to be divided into two flow channel grooves entering the core shaft from two opposite directions, the glue channel needs to be divided into two arc-shaped arrangements. By arranging a flow divider in the side glue inlet flange, the flow can be divided from the side glue inlet flange instead of starting from the joint surface of the machine head body and the glue inlet end cover, so that the curvature of the first glue channel and the second glue channel can be smoother, reducing the pressure loss of rubber material transportation.
[0013] Preferably, the head body is used in a horizontal position, that is, the core shaft is in a horizontal state when in use.
[0014] Preferably, each side wall of the die body is provided with a temperature control interlayer, a temperature control channel is provided in the temperature control interlayer, the temperature control channels of adjacent side walls are connected in series through the connection holes, the outer side of the temperature control interlayer is sealed by the side plate, a partition is provided in the middle of the temperature control channel on one side, and a temperature control inlet and a temperature control outlet are provided on the side plate, and the temperature control inlet and the temperature control outlet are respectively aligned with the two sides of the partition. The temperature control interlayer in the die body can circulate the temperature control medium, so that the internal rubber material can be kept at a suitable temperature.
[0015] Preferably, the temperature control channel is a serpentine channel.
[0016] The present invention adopts a step-by-step diversion mode to divert the rubber material in the extruder head to a plurality of spiral flow channel grooves for independent transportation, and then performs one or more annular pressurization for final extrusion, thereby improving the uniformity of the distribution of the rubber material in the flow channel of the extruder head, solving the problems of uneven annular thickness distribution and parting line of the rubber material in the rubber tube extruder head, and eliminating the hidden danger of radial tearing of the extruded rubber tube. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] The present invention will be further described below in conjunction with the accompanying drawings.
[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention.
[0019] Figure 2 It is a schematic diagram of the three-dimensional structure of the first glue path and the second glue path of the present invention.
[0020] Figure 3 It is a schematic diagram of a three-dimensional structure of a core shaft of the present invention.
[0021] Figure 4 The present invention Figure 3 Schematic diagram of the side structure of the core shaft shown.
[0022] Figure 5 It is a schematic diagram of the interior of a side-entry glue flange and the directions of a first glue channel and a second glue channel of the present invention.
[0023] Figure 6 It is a schematic diagram of the flow channel structure of an extruder head of the present invention.
[0024] Figure 7 It is a structural schematic diagram of the inlet and outlet sides of the temperature control interlayer of a head body of the present invention.
[0025] Figure 8 It is a structural schematic diagram of the non-inlet and outlet sides of the temperature control interlayer of the head body of the present invention.
[0026] In the figure: 1. head body, 2. glue inlet end cover, 3. core shaft, 4. side glue inlet flange, 5. first glue inlet adjusting bolt, 6. second glue inlet adjusting bolt, 7. first glue channel, 8. second glue channel, 9. flow channel starting groove, 10. first-level herringbone groove, 11. second-level herringbone groove, 12. spiral flow channel groove, 13. annular protrusion, 14. extrusion port, 15. temperature control inlet, 16. temperature control outlet, 17. side plate, 18. temperature control channel, 19. partition, 20. connecting hole, 21. diverter, 22. partition. DETAILED DESCRIPTION
[0027] The present invention will be further described below through specific embodiments in conjunction with the accompanying drawings.
[0028] Embodiment: A rubber tube extruder head, such as Figure 1 As shown. This structure includes a head body 1, the head body is provided with a middle hole, the inner wall of the middle hole is used as the outer wall of the flow channel, a core shaft 3 is inserted in the middle hole, a flow channel groove is provided on the surface of the core shaft, and the flow channel outer wall and the flow channel groove constitute a flow channel structure. The head body is used in a horizontal position, that is, the core shaft is in a horizontal state when in use. Figure 1 , 2 As shown, a glue inlet end cap 2 is provided at one end of the die body for glue inlet, a side glue inlet flange 4 is provided on one side of the joint surface of the die body 1 and the glue inlet end cap 2, and a first glue path 7 and a second glue path 8 are provided between the side glue inlet flange 4 and the core shaft 3 along the joint surface of the die body and the glue inlet end cap. Figure 5 As shown, a triangular pyramidal flow divider 21 is provided in the side glue inlet flange 4, the tip of the flow divider 21 faces the inlet end of the side glue inlet flange 4, and the tip of the flow divider is centrally arranged at the inlet end of the side glue inlet flange, and the two sides of the rear end of the flow divider 21 are respectively connected to the first glue channel 7 and the second glue channel 8. By pre-dividing the flow in the side glue inlet flange 4 by the flow divider, the starting points of the first glue channel 7 and the second glue channel 8 can be separated, so that the curvature of the first glue channel 7 and the second glue channel 8 is smooth, reducing the loss of glue pressure.
[0029] The glue inlet end cover 2 is aligned with the first glue channel 7 and is provided with a first glue inlet adjustment bolt 5, and the glue inlet end cover is aligned with the second glue channel 8 and is provided with a second glue inlet adjustment bolt 6. In this example, the side glue inlet flange is arranged on the lateral side of the machine head body 1, and the first glue channel 7 and the second glue channel 8 are the upper glue channel and the lower glue channel respectively; similarly, the side glue inlet flange can also be arranged on the upper side or the lower side of the machine head body 1, and the first glue channel 7 and the second glue channel 8 are symmetrically arranged as the left glue channel and the right glue channel. The first glue channel 7 is composed of two semicircular grooves respectively arranged on the machine head body and the glue inlet end cover, and the second glue channel 8 is composed of two semicircular grooves respectively arranged on the machine head body and the glue inlet end cover. The first glue channel 7 and the second glue channel 8 are both arc-shaped, and the ends of the first glue channel and the second glue channel are spaced 180 degrees apart to radially inject glue on opposite sides of the core shaft 3.
[0030] like Figure 3 , 4As shown in Figure 6, the side wall of the mandrel is aligned with the end of the first rubber channel 7 and the end of the second rubber channel 8, and the flow channel starting groove 9 is respectively arranged. The flow channel starting groove 9 is connected to a first-level herringbone groove 10, and the two ends of the first-level herringbone groove 10 are respectively connected to a second-level herringbone groove 11, and the ends of the second-level herringbone groove 11 are respectively connected to a spiral flow channel groove 12, and the spiral flow channel grooves are evenly arranged 8 around the mandrel. The groove depth of the spiral flow channel groove 12 gradually decreases along the flow channel direction, and there is a spiral partition 22 between adjacent spiral flow channel grooves 12. The thickness of the partition 22 gradually decreases along the flow channel direction, and the gap between the top surface of the partition 22 and the outer wall of the flow channel gradually increases along the flow channel direction. Each spiral flow channel groove converges at the rear end of the mandrel and connects to the extrusion port 14. The surface of the mandrel 3 is a cone with a gradually decreasing outer diameter from front to back. The rear end of the surface of the mandrel 3 is provided with an annular protrusion 13 for supercharging, and the annular protrusion 13 is arranged after the converging position of the spiral flow channel grooves and is arranged in front of the extrusion port 14. The annular protrusion 13 may be Figure 3 , 4 The single channel setting shown can also be Figure 6 Two paths are shown. If the size of the extruder head is larger, more annular protrusions 13 can be provided to perform multiple pressurization.
[0031] like Figure 7 , 8 As shown, each side wall of the head body 1 is provided with a temperature control interlayer, and a temperature control channel 18 is provided in the temperature control interlayer, and the temperature control channel is a serpentine channel. The temperature control channels 18 of adjacent side walls are connected in series through a connecting hole 20, and the outer side of the temperature control interlayer is sealed by a side plate 17. A partition 19 is provided in the middle of the temperature control channel on one side, and a temperature control inlet 15 and a temperature control outlet 16 are provided on the side plate, and the temperature control inlet and the temperature control outlet are respectively aligned with the two sides of the partition.
[0032] When the device is used, the rubber entering the mandrel flow channel groove from the first rubber channel and the rubber entering the mandrel flow channel structure from the second rubber channel are divided into one level, and then the herringbone grooves of each level are divided into twos, and finally divided into each spiral flow channel groove for independent flow, which minimizes the gravity effect on the rubber during the flow process and causes unevenness up and down. In addition, the spiral flow channel groove increases the flow channel length, and with the structure of the spiral flow channel groove with gradually decreasing groove depth and gradually increasing groove width from front to back, the rubber is evenly spread out in the spiral flow channel groove in the annular direction. After converging at the rear end of the spiral flow channel groove, it can quickly form a uniform distribution in the circumferential direction, and after being pressurized and conveyed by one or more annular protrusions, the density of the annular rubber material is uniform.
Claims
1. A rubber extruder head, comprising a head body, wherein the head body is provided with a middle hole, the inner wall of the middle hole is used as the outer wall of the flow channel, a mandrel is inserted into the middle hole, a flow channel groove is provided on the surface of the mandrel, and the flow channel outer wall and the flow channel groove constitute a flow channel structure, characterized in that: A glue inlet end cap is provided at one end of the die body for glue inlet, a side glue inlet flange is provided on one side of the joint surface of the die body and the glue inlet end cap, a first glue channel and a second glue channel are provided between the side glue inlet flange and the mandrel along the joint surface of the die body and the glue inlet end cap, a flow channel starting groove is provided on the side wall of the mandrel aligned with the end of the first glue channel and the end of the second glue channel, the flow channel starting groove is connected to multiple levels of herringbone grooves for successive diversion and then connected to a plurality of spiral flow channel grooves one by one, each level of herringbone grooves is divided according to a 1:2 ratio, and each spiral flow channel groove converges at the rear end of the mandrel and is connected to the extrusion port; The groove depth of the spiral flow channel groove gradually decreases along the flow channel direction. There is a spiral partition between adjacent spiral flow channel grooves. The thickness of the partition gradually decreases along the flow channel direction, and the gap between the top surface of the partition and the outer wall of the flow channel gradually increases along the flow channel direction.
2. A rubber extruder head according to claim 1, characterized in that: The glue inlet end cover is aligned with the first glue path and is provided with a first glue inlet adjusting bolt, and the glue inlet end cover is aligned with the second glue path and is provided with a second glue inlet adjusting bolt.
3. A rubber extruder head according to claim 1, characterized in that: The starting groove of the flow channel is connected to a primary herringbone groove, the two ends of the primary herringbone groove are respectively connected to secondary herringbone grooves, and the ends of the secondary herringbone grooves are respectively connected to spiral flow channel grooves, and 8 spiral flow channel grooves are evenly arranged around the core shaft.
4. A rubber extruder head according to claim 1, 2 or 3, characterized in that: The core shaft surface is a cone with an outer diameter gradually decreasing from front to back. The rear end of the core shaft surface is provided with one or more annular protrusions for pressurization. The annular protrusions are arranged after the confluence position of the spiral flow channel groove and at the front side of the extrusion port.
5. A rubber extruder head according to claim 1, 2 or 3, characterized in that: The first glue path is formed by combining two semicircular grooves respectively arranged on the machine head body and the glue inlet end cover, and the second glue path is formed by combining two semicircular grooves respectively arranged on the machine head body and the glue inlet end cover.
6. A rubber extruder head according to claim 1, 2 or 3, characterized in that: The first glue path and the second glue path are both arc-shaped and symmetrically arranged on both sides of the core shaft. The ends of the first glue path and the second glue path are spaced 180 degrees apart and radially glued on opposite sides of the core shaft.
7. A rubber extruder head according to claim 1, 2 or 3, characterized in that: A triangular cone-shaped diverter is arranged in the side glue inlet flange, the tip of the diverter faces the inlet end of the side glue inlet flange, and the tip of the diverter is centrally arranged at the inlet end of the side glue inlet flange, and the two sides of the rear end of the diverter are respectively connected to the first glue channel and the second glue channel.
8. A rubber extruder head according to claim 1, 2 or 3, characterized in that: A temperature control interlayer is arranged on each side wall of the head body, a temperature control channel is arranged in the temperature control interlayer, the temperature control channels of adjacent side walls are connected in series through connecting holes, the outer side of the temperature control interlayer is sealed by a side panel, a partition is arranged in the middle of the temperature control channel on one side, and a temperature control inlet and a temperature control outlet are arranged on the side panel, and the temperature control inlet and the temperature control outlet are respectively aligned with both sides of the partition.
9. A rubber extruder head according to claim 8, characterized in that: The temperature control channel is a serpentine channel.