Anti-leakage injection molding head of injection molding machine
By designing an anti-leakage injection molding head with motor-driven control block and arc-shaped part in the injection molding machine, the problem of residual material residue on the outer side of the high-temperature resistant piston block is solved, and more efficient sealing and raw material flow control is achieved, which improves the Effect of injection molding head.
Patent Information
- Application Number
- CN202210819579.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2022-07-12
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2042-07-12
AI Technical Summary
During the use of the anti-leakage injection head of the existing injection molding machine, the residual material on the outside of the high-temperature-resistant piston block is still retained, resulting in leakage and blockage problems, and it is difficult to effectively control the flow of raw materials.
A leak-proof injection molding head including discharge pipe, injection molding joint, control block, motor and arc-shaped part is designed. The motor drives the control block to rotate to achieve sealing and opening of the discharge groove, and scraping off residual material using arc-shaped part , and the raw materials are heated and cooled by heating wire, and the open quantity of the discharge tank is controlled to adjust the raw materials flow rate.
Effectively seal the unflowed raw materials, reduce leakage and blockage, improve the leakage prevention effect of the injection molding head, and quickly restore the raw material flow through heating wire, control the raw material flow, and reduce the failure rate and cost.
Smart Images
Figure CN115195032B_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of injection molding machines, in particular to an anti-leakage injection molding head of an injection molding machine. Background Art
[0002] Vertical injection molding machine is a kind of mechanical equipment, usually composed of injection system, mold clamping system, hydraulic transmission system, electrical control system, lubrication system, heating and cooling system, safety monitoring system, etc. The injection system is one of the most important components of the injection molding machine, generally there are three main types: plunger type, screw type, screw pre-plastic plunger injection type. The injection gun at the bottom of the existing injection molding machine is directly connected to the injection port on the mold. When the injection molding process often requires frequent cutting operations, a small part of the blank may leak from the gun head and caliber, which will not only increase the production cost, but also affect the injection molding effect and increase the difficulty of cleaning.
[0003] A Chinese patent with the publication number CN216760611U discloses a leak-proof injection head for a vertical injection molding machine, including an injection joint, an internal upper end of the injection joint is set as an extrusion channel, a lower end of the extrusion channel is set as a mounting cavity, a mounting block is provided inside the mounting cavity, an extrusion ring channel is provided between the side wall of the mounting block and the inner wall of the mounting cavity, a ring groove is provided on one side of the upper end of the extrusion ring channel, a high-temperature resistant piston block slides inside the ring groove, and a high-temperature resistant isolation ring block is connected to the lower end of the high-temperature resistant piston block; an insulation mounting cover is installed on the side wall of the injection joint, a sliding ring plate slides inside the insulation mounting cover, a plurality of electric push rods are connected between the upper end of the sliding ring plate and the inner top wall of the insulation mounting cover, a transmission ring plate is connected to the lower end of the sliding ring plate, the other end of the transmission ring plate is connected to the upper end of the high-temperature resistant piston block, and sealing rings are provided on the inner and outer walls of the transmission ring plate. The utility model can prevent the leakage of raw materials, reduce the loss of raw materials, and improve the injection molding effect.
[0004] Although the leakage-proof injection molding head in the above technology can seal the discharge channel by pushing the sliding ring plate and the high-temperature resistant piston block, a small amount of residual material on the outside of the high-temperature resistant piston block still remains inside the injection nozzle, causing this part of the residual material to still leak, and also causing the residual material to block the injection nozzle after cooling.
[0005] Therefore, the present invention provides a leakage-proof injection molding head for an injection molding machine. Summary of the invention
[0006] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.
[0007] The technical solution adopted by the present invention to solve its technical problems is: the anti-leakage injection head of an injection molding machine described in the present invention comprises a discharge pipe; an injection molding joint is connected to the end of the discharge pipe, and the discharge end of the injection molding joint is rotatably connected to a control block through a rotating rod, the cross-sectional shape of the control block is circular, and the discharge end of the injection molding joint is provided with an arc portion that fits with the side wall of the control block, and the side wall of the control block is provided with a discharge groove connecting the inside of the injection molding joint with the outside, and a motor is installed on the outer wall of the injection molding joint, and the output end of the motor is connected to the end of the rotating rod; the anti-leakage injection head in the prior art can seal the discharge channel by pushing the sliding ring plate to move and the high-temperature resistant piston block, but a small amount of residual material on the outside of the high-temperature resistant piston block still remains in the injection nozzle, resulting in the leakage of this part of the residual material, and also causing the problem of the residual material blocking the injection nozzle after cooling; and the anti-leakage injection head in the present invention is electrically The machine drives the control block to rotate, so that the two ends of the control block are respectively located at the inner and outer sides of the injection joint and are not blocked by the arc-shaped part, so that the molten raw material in the injection joint can flow out from the opened discharge slot. When the injection molding work is completed, the motor (the motor can be a servo motor that can rotate forward and reverse) can be used to drive the control block to rotate counterclockwise, so that the two ends of the discharge slot move to the arc-shaped part respectively and are blocked by the arc-shaped part, thereby achieving the effect of quickly blocking the discharge slot, and can fully block the raw material that has not flowed out of the end of the injection joint, thereby improving the anti-leakage effect of the injection molding head. At the same time, when the outer end of the discharge slot rotates, the end of the arc-shaped part can also be used to scrape off the remaining residual material, and the end of the discharge slot is blocked. The discharge slot is set in multiple groups, and the number of discharge slots driven by the control motor can be controlled to control the outflow channel area of the raw material, thereby effectively controlling the flow of the raw material and improving the practical effect of the anti-leakage injection molding head.
[0008] Preferably, a plurality of groups of heating wires are embedded and installed inside the control block, and the heating wires are arranged in a wavy shape; when the control block is in a closed state, as the temperature inside the control block gradually decreases, the residual material in the discharge trough will gradually cool down. When injection molding is required again, the heating wire can be turned on to heat the cooled raw material at the control block and restore it to a molten state again, which is convenient for the outflow of the residual material. At the same time, the wavy heating wire also increases the heating area of the control block, so that the control block can heat the raw material more quickly.
[0009] Preferably, a wavy portion is provided at the arc portion that blocks the inner end of the discharge trough, and the raised portion of the wavy portion is in contact with the side wall of the control block. By providing the wavy portion at the arc portion at the inner end of the discharge trough, the inner end of the discharge trough can be sealed while reducing the contact area between the arc portion and the side wall of the control block, thereby reducing the friction resistance between the two during relative movement in the viscous raw material. At the same time, the raised portion located at the innermost end of the wavy portion can scrape off the excess material at the control block that rotates counterclockwise, thereby reducing the situation where the control block drives the raw material into the recessed area of the wavy portion.
[0010] Preferably, a slide groove is provided at the raised position of the inner end of the wavy portion, a slider which fits the side wall thereof is slidably connected inside the slide groove, the outer end of the slider is provided with an arc surface which matches the raised shape of the wavy portion, a spring is connected between the inner end of the slider and the inside of the slide groove, and a pressure relief groove which connects the inner end of the slide groove with the outside is provided inside the injection molding joint; when the raw material is initially condensed and adheres to the side wall of the control block more firmly, the resistance to relative movement between the raw material and the raised part of the wavy portion is relatively large, and in severe cases, jamming may occur, at which time, by controlling the inner end of the wavy portion The structure of the end protrusion is that when the control block rotates counterclockwise, if the adhesion of the raw material on the control block is not strong, the slider can scrape the material on its surface. When the adhesion of the raw material on the control block is strong, the block-shaped raw material will press the slider toward the inner end of the slide groove, so that the slider allows the control block and the raw material to slide out smoothly after avoiding, thereby reducing the situation where the raw material on the control block and the wavy part have a large resistance or get stuck. The pressure relief groove can make the squeezed gas in the slide groove flow out when the slider slides toward the inner end of the slide groove, thereby allowing the movement of the slider to proceed smoothly.
[0011] Preferably, a sliding cavity that penetrates the pressure relief groove is provided on the inner wall of the arc-shaped portion at the position of the slider, and a sealing block that fits the side wall thereof is slidably connected inside the sliding cavity, an elastic member is connected between the sealing block and the inner end of the sliding cavity, and an air guide groove that is connected to the pressure relief groove is provided on the side wall at the inner end of the sliding cavity; when the injection molding head performs injection molding, the high-pressure molten material inside the injection molding joint will exert a certain pressure on the sealing block, causing the sealing block to slide toward the inner end of the sliding cavity until the sealing block moves to the pressure relief groove and seals the pressure relief groove, so that the interior of the sliding groove is in a sealed state, reducing the risk of sliding. The block slides toward the inner end of the slide groove under the high-pressure material, causing the material to flow into the depressed area of the wavy part. When the injection molding work is completed, as the high-pressure state inside the injection molding joint disappears, the blocking block can be reset under the rebound force of the elastic member and no longer blocks the pressure relief groove, so that the subsequent avoidance work of the slider can be carried out smoothly. The air guide groove is provided for the outflow of the gas inside the slide cavity after being squeezed by the blocking block. The above-mentioned airway opening and closing structure can be automatically operated by the pressure of the injection molding raw material, without the need to set up a complex electronic control mechanism, thereby reducing the cost and failure rate of the injection molding head.
[0012] Preferably, an arc-shaped heat insulation board is embedded and installed on the side wall of the control block at the inner end of the discharge trough, and the outer diameter of the heat insulation board is the same as the diameter of the control block; when the control block drives the material with stronger adhesion to move to the recessed area of the wavy part, during the next injection molding operation, due to the heat insulation effect of the heat insulation board, the block-shaped raw material at the inner end of the discharge trough is difficult to melt effectively, while the material in other areas can be melted smoothly by heat, so that when the control block rotates clockwise subsequently, it can drive the unmelted material at the heat insulation board to slide out from the slider without being scraped off by the slider, thereby further reducing the situation where the material remains in the recessed area of the wavy part, and when the material on the heat insulation board slides out of the arc-shaped part, the unmelted material on the partition board will gradually melt after contacting with the high-temperature material inside the injection molding joint and can be effectively extruded and utilized.
[0013] Preferably, the injection molding joint consists of a fixed joint and a movable joint, the discharge pipe is connected to the fixed joint, the movable joint is threadedly connected to the fixed joint, and a discharge sleeve is connected to the inside of the discharge trough; when the injection molding joint fails, only the movable joint needs to be unscrewed from the fixed joint for convenient replacement or repair, which also facilitates the cleaning of the inside. At the same time, by arranging the discharge sleeve in the discharge trough and using the discharge sleeve for discharging, when maintenance or cleaning is needed, only the discharge sleeve needs to be removed from the discharge trough, thereby improving the practicality of the injection molding head.
[0014] Preferably, a support frame is fixedly connected to the outer wall of the discharge end of the injection molding joint, and a winding rod is connected to the side wall of the support frame through a winding spring, a protective layer is wound on the winding rod, and the free end of the protective layer is connected to a magnetic block, and an adsorption block is embedded and installed at the side wall of the control block corresponding to the magnetic block, and the magnetic block can attract the adsorption block; when the control block is injection molding, the adsorption block is located on the side of the arc portion close to the protective layer, and the protective layer is wound on the winding rod under the action of the winding spring. When the injection molding work is completed, as the control block rotates counterclockwise, the control block drives the adsorption block to rotate synchronously, and at the same time, the adsorption block can drive the protective layer to be pulled away from the winding rod through the attraction of the magnetic block, and shield the control block, thereby achieving the effect of dust and moisture prevention for the exposed outer surface of the control block, thereby improving the working quality and service life of the control block.
[0015] The beneficial effects of the present invention are as follows:
[0016] 1. The present invention provides an anti-leakage injection head for an injection molding machine, which can fully seal the raw material that has not flowed out from the end of the injection joint, thereby improving the anti-leakage effect of the injection head. At the same time, when the outer end of the discharge chute rotates, the end of the arc portion can also be used to scrape off the remaining excess material to prevent blockage at the end of the discharge chute. The discharge chute is arranged in multiple groups, and the number of discharge chute openings driven by the control motor can be controlled to control the outflow channel area of the raw material, thereby effectively controlling the flow of the raw material and improving the practical effect of the anti-leakage injection head.
[0017] 2. The present invention provides an anti-leakage injection head for an injection molding machine, which heats the raw material cooled at the control block through an electric heating wire and restores it to a molten state again, which is convenient for the outflow and utilization of the remaining material. At the same time, the wavy electric heating wire also increases the heating area of the control block, so that the control block can heat the raw material more quickly. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.
[0019] The present invention will be further described below in conjunction with the accompanying drawings.
[0020] Figure 1 It is a three-dimensional schematic diagram of the present invention;
[0021] Figure 2 It is a partial structural schematic diagram of the present invention;
[0022] Figure 3 yes Figure 2 The enlarged view of point A in the middle;
[0023] Figure 4 is a schematic structural diagram of the end of the injection-molded joint in the second embodiment;
[0024] In the figure: a discharge pipe 1, an injection joint 2, a control block 3, an arc-shaped portion 4, a discharge trough 5, a motor 6, a heating wire 7, a wavy portion 8, a slide trough 9, a slider 10, a pressure relief groove 11, a slide cavity 12, a blocking block 13, an elastic member 14, an air guide groove 15, a heat insulation board 16, a fixed joint 17, a movable joint 18, a discharge sleeve 19, a support frame 20, a reeling rod 21, a protective layer 22, a magnetic block 23, and an adsorption block 24. DETAILED DESCRIPTION
[0025] In order to make the technical means, creative features, objectives and effects of the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0026] Embodiment 1:
[0027] See also Figure 1-Figure 3 As shown, an anti-leakage injection molding head of an injection molding machine described in an embodiment of the present invention comprises a discharge pipe 1; an injection molding joint 2 is connected to the end of the discharge pipe 1, and the discharge end of the injection molding joint 2 is rotatably connected to a control block 3 through a rotating rod, and the cross-sectional shape of the control block 3 is circular, and the discharge end of the injection molding joint 2 is provided with an arc portion 4 that fits with the side wall of the control block 3, and a discharge groove 5 connecting the inside of the injection molding joint 2 with the outside is opened on the side wall of the control block 3, and a motor 6 is installed on the outer wall of the injection molding joint 2, and the output end of the motor 6 is connected to the end of the rotating rod; the anti-leakage injection molding head in the prior art can seal the discharge channel by pushing the sliding ring plate to move and the high-temperature resistant piston block, but a small amount of residual material on the outside of the high-temperature resistant piston block still remains in the injection nozzle, resulting in the leakage of this part of the residual material, and also causing the problem of the residual material blocking the injection nozzle after cooling; and the anti-leakage injection molding head of the present invention, when in use, drives the control block 3 to Rotate so that the two ends of the control block 3 are respectively located at the inner and outer sides of the injection joint 2 and are not blocked by the arc portion 4, so that the molten raw material in the injection joint 2 can flow out from the opened discharge slot 5. When the injection molding work is completed, the motor 6 (the motor 6 can be a servo motor 6 that can rotate forward and reverse) can be used to drive the control block 3 to rotate counterclockwise, so that the two ends of the discharge slot 5 move to the arc portion 4 respectively and are blocked by the arc portion 4, thereby achieving the effect of quickly blocking the discharge slot 5, and the raw material that has not flowed out of the end of the injection joint 2 can be fully blocked, thereby improving the anti-leakage effect of the injection molding head. At the same time, when the outer end of the discharge slot 5 rotates, the end of the arc portion 4 can also be used to scrape off the remaining residual material, and the end of the discharge slot 5 is blocked. The discharge slot 5 is set in multiple groups, and the number of discharge slots 5 opened can be driven by the control motor 6 to control the outflow channel area of the raw material, thereby effectively controlling the flow of the raw material and improving the practical effect of the anti-leakage injection molding head.
[0028] A plurality of groups of electric heating wires 7 are embedded and installed inside the control block 3, and the electric heating wires 7 are arranged in a wavy shape. When the control block 3 is in a closed state, as the temperature inside the control block 3 gradually decreases, the residual material in the discharge trough 5 will gradually cool down. When injection molding is required again, the electric heating wires 7 can be opened at this time to heat the cooled raw material at the control block 3 and restore it to a molten state again, which is convenient for the outflow of the residual material. At the same time, the wavy electric heating wires 7 also increase the heating area of the control block 3, so that the control block 3 can heat the raw material more quickly.
[0029] A wavy portion 8 is provided at the arc portion 4 that blocks the inner end of the discharge trough 5, and the raised portion of the wavy portion 8 fits with the side wall of the control block 3; by providing the wavy portion 8 at the arc portion 4 at the inner end of the discharge trough 5, the inner end of the discharge trough 5 is blocked while reducing the contact area between the arc portion 4 and the side wall of the control block 3, thereby reducing the friction resistance between the two when they move relative to each other in the viscous raw material. At the same time, the raised portion located at the innermost end of the wavy portion 8 can scrape off the excess material at the control block 3 that rotates counterclockwise, thereby reducing the situation where the control block 3 drives the raw material into the recessed area of the wavy portion 8.
[0030] A slide groove 9 is arranged at the raised position at the inner end of the wavy portion 8, and a slider 10 fitting with the side wall is slidably connected inside the slide groove 9, and the outer end of the slider 10 is arranged as an arc surface matching the raised shape of the wavy portion 8, and a spring is connected between the inner end of the slider 10 and the inside of the slide groove 9, and a pressure relief groove 11 connecting the inner end of the slide groove 9 with the outside is arranged inside the injection joint 2; when the raw material is initially condensed and adheres to the side wall of the control block 3 more firmly, the resistance of the raw material to the relative movement of the raised part of the wavy portion 8 is relatively large, and in severe cases, it may get stuck, and at this time, the raised part at the inner end of the control block 8 is controlled to be fixed. According to the structure, when the control block 3 rotates counterclockwise, if the adhesion of the raw material on the control block 3 is not strong, the slider 10 can scrape the material on its surface. When the adhesion of the raw material on the control block 3 is large, the block-shaped raw material will press the slider 10 toward the inner end of the slide groove 9, so that the slider 10 allows the control block 3 and the raw material to slide out smoothly after avoiding, thereby reducing the situation where the convex resistance of the raw material on the control block 3 and the wavy portion 8 is large or stuck. The pressure relief groove 11 can make the compressed gas in the slide groove 9 flow out when the slider 10 slides toward the inner end of the slide groove 9, so that the movement of the slider 10 can proceed smoothly.
[0031] A sliding cavity 12 penetrating the pressure relief groove 11 is provided on the inner wall of the arc-shaped portion 4 at the position of the slider 10, and a blocking block 13 fitting with the side wall thereof is slidably connected inside the sliding cavity 12, and an elastic member 14 is connected between the blocking block 13 and the inner end of the sliding cavity 12, and an air guide groove 15 connected with the pressure relief groove 11 is provided on the side wall at the inner end of the sliding cavity 12; when the injection molding head performs the injection molding operation, the high-pressure molten material inside the injection molding joint 2 will exert a certain pressure on the blocking block 13, so that the blocking block 13 slides toward the inner end of the sliding cavity 12 until the blocking block 13 moves to the pressure relief groove 11 and blocks the pressure relief groove 11, so that the inside of the sliding groove 9 is in a tight The sealing state reduces the sliding of the slider 10 toward the inner end of the slide groove 9 under the high-pressure material, causing the material to flow into the concave area of the wavy part 8. When the injection molding work is completed, as the high-pressure state inside the injection joint 2 disappears, the blocking block 13 can be reset under the rebound force of the elastic member 14 and no longer blocks the pressure relief groove 11, so that the subsequent avoidance work of the slider 10 can be carried out smoothly. The air guide groove 15 is provided for the outflow of the gas inside the slide cavity 12 after being squeezed by the blocking block 13. The above-mentioned airway opening and closing structure can be automatically operated by the pressure of the injection molding raw material, without the need to set up a complex electronic control mechanism, thereby reducing the cost and failure rate of the injection molding head.
[0032] An arc-shaped heat insulation board 16 is embedded and installed on the side wall of the control block 3 at the inner end of the discharge trough 5, and the outer diameter of the heat insulation board 16 is the same as the diameter of the control block 3; when the control block 3 drives the material with stronger adhesion to move to the recessed area of the wavy portion 8, during the next injection molding operation, due to the heat insulation effect of the heat insulation board 16, the block-shaped raw material at the inner end of the discharge trough 5 is difficult to be effectively melted, while the material in other areas can be smoothly heated and melted, so that when the control block 3 rotates clockwise subsequently, it can drive the unmelted material at the heat insulation board 16 to slide out from the slider 10 without being scraped off by the slider 10, thereby further reducing the situation where the material remains in the recessed area of the wavy portion 8, and when the material on the heat insulation board 16 slides out of the arc-shaped portion 4, the unmelted material on the partition board will gradually melt after contacting the high-temperature material inside the injection joint 2 and can be effectively extruded and utilized.
[0033] The injection joint 2 is composed of a fixed joint 17 and a movable joint 18, the discharge pipe 1 is connected to the fixed joint 17, the movable joint 18 is threadedly connected to the fixed joint 17, and a discharge sleeve 19 is connected to the inside of the discharge trough 5; when the injection joint 2 fails, only the movable joint 18 is screwed out from the fixed joint 17, so that it can be easily replaced or repaired, and it is also convenient to clean the inside. At the same time, by arranging the discharge sleeve 19 in the discharge trough 5 and using the discharge sleeve 19 to perform discharge work, when maintenance or cleaning is needed, only the discharge sleeve 19 needs to be removed from the discharge trough 5, thereby improving the practicality of the injection molding head.
[0034] Embodiment 2:
[0035] like Figure 4 As shown, in contrast to Example 1, another embodiment of the present invention is as follows: a support frame 20 is fixedly connected to the outer wall of the discharge end of the injection molding joint 2, a winding rod 21 is connected to the side wall of the support frame 20 through a winding spring, a protective layer 22 is wound around the winding rod 21, a magnetic block 23 is connected to the free end of the protective layer 22, an adsorption block 24 is inlaid and installed at the side wall of the control block 3 corresponding to the magnetic block 23, and the magnetic block 23 can attract the adsorption block 24; when the control block 3 is injection molded, the adsorption Block 24 is located on one side of the arc-shaped portion 4 close to the protective layer 22. The protective layer 22 is wound around the winding rod 21 under the action of the winding spring. When the injection molding work is completed, as the control block 3 rotates counterclockwise, the control block 3 drives the adsorption block 24 to rotate synchronously. At the same time, the adsorption block 24 can attract the magnetic block 23 to drive the protective layer 22 to be pulled away from the winding rod 21 and cover the control block 3, thereby achieving dust and moisture-proof effect on the exposed outer surface of the control block 3, thereby improving the working quality and service life of the control block 3.
[0036] Working principle: When the anti-leakage injection molding head of the present invention is in use, the control block 3 is driven to rotate by the motor 6, so that the two ends of the control block 3 are respectively located on the inner and outer sides of the injection molding joint 2, and are not blocked by the arc-shaped portion 4, so that the molten raw material in the injection molding joint 2 can flow out from the opened discharge slot 5. When the injection molding work is completed, the motor 6 (the motor 6 can be a servo motor 6 that can rotate forward and reverse) can be used to drive the control block 3 to rotate counterclockwise, so that the two ends of the discharge slot 5 move to the arc-shaped portion 4 respectively and are blocked by the arc-shaped portion 4, thereby achieving the effect of quickly blocking the discharge slot 5, and can fully block the raw material that has not flowed out of the end of the injection molding joint 2, thereby improving the anti-leakage of the injection molding head. The outer end of the discharge chute 5 can also use the end of the arc portion 4 to scrape off the remaining excess material when it rotates, and prevent the end of the discharge chute 5 from being blocked. The discharge chute 5 is provided with multiple groups, and the number of discharge chute 5 opened can be driven by the control motor 6 to control the outflow channel area of the raw material, so as to effectively control the flow of the raw material and improve the practical effect of the anti-leakage injection molding head; when the control block 3 is in the closed state, as the internal temperature of the control block 3 gradually decreases, the excess material in the discharge chute 5 will gradually cool down. When injection molding is required again, the heating wire 7 can be turned on at this time to heat the raw material cooled at the control block 3 and restore it to a molten state again, which is convenient for the outflow of the excess material. The hot wire 7 also increases the heating area of the control block 3, so that the control block 3 can heat the raw material more quickly; by providing the wavy portion 8 at the arc portion 4 at the inner end of the discharge trough 5, the inner end of the discharge trough 5 is blocked, and the contact area between the arc portion 4 and the side wall of the control block 3 can be reduced, thereby reducing the friction resistance of the two during relative movement in the viscous raw material. At the same time, the protrusion located at the innermost end of the wavy portion 8 can scrape off the excess material at the control block 3 rotating counterclockwise, reducing the situation where the control block 3 drives the raw material into the concave area of the wavy portion 8; when the raw material is initially condensed and adheres more firmly to the side wall of the control block 3, the resistance of the raw material to relative movement with the protrusion of the wavy portion 8 is relatively large In severe cases, the block 3 may get stuck. At this time, by controlling the structure of the raised part at the inner end of the wavy part 8, when the control block 3 rotates counterclockwise, if the adhesion of the raw material on the control block 3 is not strong, the slider 10 can scrape the material on its surface. When the adhesion of the raw material on the control block 3 is large, the block-shaped raw material will press the slider 10 toward the inner end of the chute 9, so that the slider 10 can smoothly slide out the control block 3 and the raw material after avoiding, thereby reducing the large resistance or jamming between the raw material on the control block 3 and the raised part of the wavy part 8, and the pressure relief groove 11 can make the compressed gas in the chute 9 flow out when the slider 10 slides toward the inner end of the chute 9, so that the movement of the slider 10 can be carried out smoothly.When the injection molding head is performing the injection molding work, the high-pressure molten material inside the injection molding joint 2 will exert a certain pressure on the blocking block 13, causing the blocking block 13 to slide toward the inner end of the slide cavity 12 until the blocking block 13 moves to the pressure relief groove 11 and blocks the pressure relief groove 11, so that the inside of the slide groove 9 is in a sealed state, reducing the sliding block 10 from sliding toward the inner end of the slide groove 9 under the high-pressure material, causing the material to flow into the recessed area of the wavy portion 8. When the injection molding work is completed, as the high-pressure state inside the injection molding joint 2 disappears, the blocking block 13 can be reset under the rebound force of the elastic member 14 and no longer blocks the pressure relief groove 11, thereby preventing the subsequent sliding block 10 from sliding toward the inner end of the slide groove 9 under the high-pressure material. In order to make the work proceed smoothly, the air guide groove 15 is provided, which is used for the gas inside the sliding cavity 12 to flow out after being squeezed by the blocking block 13, and the above-mentioned airway opening and closing structure can be automatically operated by the pressure of the injection molding raw material, without the need to set up a complex electric control mechanism, thereby reducing the cost and failure rate of the injection molding head; when the control block 3 drives the material with stronger adhesion to move to the recessed area of the wavy portion 8, during the next injection molding work, due to the heat insulation effect of the heat insulation board 16, the block material at the inner end of the discharge trough 5 is difficult to be effectively melted, while the material in other areas can be smoothly heated and melted, so that when the control block 3 rotates clockwise subsequently, it can drive the unmelted material at the heat insulation board 16 The material slides out from the slider 10 without being scraped off by the slider 10, thereby further reducing the situation where the material remains in the concave area of the wavy portion 8. When the material on the insulation board 16 slides out of the arc-shaped portion 4, the unmelted material on the partition board will gradually melt and can be effectively extruded and utilized after contacting the high-temperature material inside the injection joint 2; when the injection joint 2 fails, at this time, only the movable joint 18 is screwed out from the fixed joint 17, which can be conveniently replaced or repaired, and it is also convenient to clean the inside thereof. At the same time, by arranging a discharge sleeve 19 in the discharge trough 5 and using the discharge sleeve 19 for discharging, when maintenance or cleaning is required, only the movable joint 18 is screwed out from the fixed joint 17, so as to facilitate replacement or maintenance. The discharge sleeve 19 can be removed from the discharge slot 5, which improves the practicality of the injection head; when the control block 3 is performing injection molding, the adsorption block 24 is located on the side of the arc portion 4 close to the protective layer 22, and the protective layer 22 is wound on the reeling rod 21 under the action of the coil spring. When the injection molding work is completed, as the control block 3 rotates counterclockwise, the control block 3 drives the adsorption block 24 to rotate synchronously. At the same time, the adsorption block 24 can drive the protective layer 22 to be pulled away from the reeling rod 21 by attracting the magnetic block 23, and shield the control block 3, so that the exposed outer surface of the control block 3 can be dust-proof and moisture-proof, thereby improving the working quality and service life of the control block 3. ;
[0037] The basic principles, main features and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and the description in the specification are only to illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.
Claims
1. An anti-leakage injection molding head of an injection molding machine, comprising a discharge pipe (1); characterized in that: The end of the discharge pipe (1) is connected to an injection joint (2), the discharge end of the injection joint (2) is rotatably connected to a control block (3) via a rotating rod, the cross-sectional shape of the control block (3) is circular, the discharge end of the injection joint (2) is provided with an arc portion (4) that fits with the side wall of the control block (3), the side wall of the control block (3) is provided with a discharge groove (5) that connects the inside of the injection joint (2) with the outside, and a motor (6) is installed on the outer wall of the injection joint (2), and the output end of the motor (6) is connected to the end of the rotating rod; The injection joint (2) is composed of a fixed joint (17) and a movable joint (18); the discharge pipe (1) is connected to the fixed joint (17); the movable joint (18) is threadedly connected to the fixed joint (17); and a discharge sleeve (19) is connected inside the discharge trough (5); A support frame (20) is fixedly connected to the outer wall of the discharge end of the injection joint (2); a winding rod (21) is connected to the side wall of the support frame (20) via a winding spring; a protective layer (22) is wound around the winding rod (21); a free end of the protective layer (22) is connected to a magnetic block (23); an adsorption block (24) is embedded and installed at the side wall of the control block (3) corresponding to the magnetic block (23); and the magnetic block (23) is capable of attracting the adsorption block (24).
2. The anti-leakage injection molding head of an injection molding machine according to claim 1, characterized in that: A plurality of groups of electric heating wires (7) are embedded and installed inside the control block (3), and the electric heating wires (7) are arranged in a wave shape.
3. The anti-leakage injection molding head of an injection molding machine according to claim 2, characterized in that: A wavy portion (8) is provided at the arc-shaped portion (4) that blocks the inner end of the discharge chute (5), and a raised portion of the wavy portion (8) fits against a side wall of the control block (3).
4. The anti-leakage injection molding head of an injection molding machine according to claim 3, characterized in that: A slide groove (9) is provided at a raised position at the inner end of the wavy portion (8); a slider (10) is slidably connected to the inside of the slide groove (9) and is fitted with a side wall thereof; the outer end of the slider (10) is provided with an arc-shaped surface matching the raised shape of the wavy portion (8); a spring is connected between the inner end of the slider (10) and the inside of the slide groove (9); and a pressure relief groove (11) is provided inside the injection joint (2) and connects the inner end of the slide groove (9) with the outside.
5. The anti-leakage injection molding head of an injection molding machine according to claim 4, characterized in that: A sliding cavity (12) penetrating the pressure relief groove (11) is provided on the inner wall of the arc-shaped portion (4) at the position of the slide block (10); a sealing block (13) in contact with the side wall of the sliding cavity (12) is slidably connected inside the sliding cavity (12); an elastic member (14) is connected between the sealing block (13) and the inner end of the sliding cavity (12); and an air guide groove (15) communicating with the pressure relief groove (11) is provided on the side wall of the inner end of the sliding cavity (12).
6. The anti-leakage injection molding head of an injection molding machine according to claim 4, characterized in that: An arc-shaped heat insulation board (16) is inlaid and installed on the side wall of the control block (3) at the inner end of the discharge chute (5), and the outer diameter of the heat insulation board (16) is the same as the diameter of the control block (3).