Injection molding plunger head

Abstract

The utility model discloses an injection molding plunger head, and relates to the field of injection molding machines, the injection molding plunger head comprises a plunger head and a charging barrel movably sleeved on the outer side of the plunger head and used for accommodating plastic particles, one end of the charging barrel is fixedly provided with a nozzle for injecting colloid, and one end of the plunger head far away from the nozzle is fixedly provided with a plunger rod; one end, far away from the plunger head, of the plunger rod is fixedly provided with a quick release mechanism convenient for replacing the plunger head; the quick detaching mechanism comprises a first fixing block and a second fixing block connected with the first fixing block in a clamped mode, inserting rods are inserted into the two sides of the upper end of the second fixing block, and inserting blocks are fixedly arranged at the top ends of the two inserting rods; the multi-stage pressure equalizing grooves are formed in the surface of the plunger head, so that the plunger head can adapt to pressure gradients of different sections conveniently; the main pipeline and the backflow pipeline enable redundant sizing materials to flow back to the tail of the charging barrel, the sizing materials are prevented from being accumulated or leaked in the device, the plunger head is conveniently and rapidly installed, detached and replaced through the rapid detaching mechanism, the shutdown maintenance period is shortened, and the production efficiency is improved.

Description

Technical Field

[0001] This application relates to the field of injection molding machines, and more particularly to an injection plunger head. Background Technology

[0002] An injection molding machine is a primary molding device that uses plastic molds to shape thermoplastic or thermosetting plastics into various shapes of plastic products. During operation, pre-plasticized molten plastic is injected into a closed mold cavity. Its working principle is similar to that of a syringe; the raw material in the barrel is injected into the mold through the feeding tube and conical nozzle under the action of the feeding pusher.

[0003] For example, patent application number 202123063814.4 discloses a plunger head and an injection molding machine, but it still has the following shortcomings in actual use:

[0004] The above-mentioned device has a plunger head body, a pressure equalization groove to prevent jamming, and allows overflowing adhesive to flow back. The injection head, conical connection, return pipe, and return hole constitute a return system to prevent adhesive leakage. However, during use, the pressure equalization groove is singular, the pressure distribution is uneven, and the adhesive is prone to stagnation in the pressure equalization groove. Disassembling and installing the plunger head requires a lot of time and manpower, which affects production efficiency. Utility Model Content

[0005] To address the issues of material retention and inconvenient installation and replacement of the plunger head, this application provides an injection-molded plunger head.

[0006] The injection-molded plunger head provided in this application adopts the following technical solution:

[0007] An injection plunger head includes a plunger head and a barrel movably sleeved on the outside of the plunger head to accommodate plastic particles. One end of the barrel is fixedly provided with a nozzle for injecting colloid. A plunger rod is fixedly provided at the end of the plunger head away from the nozzle. A quick-release mechanism for easy replacement of the plunger head is fixedly provided at the end of the plunger rod away from the plunger head. The quick-release mechanism includes a first fixing block and a second fixing block that engages with the first fixing block. Insert rods are inserted into both sides of the upper end of the second fixing block, and insert blocks are fixedly provided at the top ends of the two insert rods.

[0008] By adopting the above technical solution, the device contains plastic particles in a barrel and injects the adhesive through a nozzle. The reciprocating motion of the plunger rod pushes the plunger head to move back and forth in the barrel, thereby achieving heating, melting and injection of the plastic particles. The quick-release mechanism uses fixed block one and fixed block two to engage, and is connected and fixed by the insert rod and the insert block, which facilitates the replacement of the plunger head.

[0009] Preferably, a cross block is fixed on the side of the fixing block one facing the fixing block two, and a cross groove adapted to the shape of the cross block is fixed on the side of the fixing block two facing the cross block.

[0010] By adopting the above technical solution, the first fixing block is engaged with the cross-shaped groove on the second fixing block through the cross-shaped block on it, so as to achieve precise positioning and stable connection.

[0011] Preferably, the upper end of the second fixing block is provided with two circular holes, and the middle part of the cross block is provided with two circular holes of the same shape and position as the first circular hole. The two insertion rods respectively pass through the first circular hole and the second circular hole.

[0012] By adopting the above technical solution, the position of the first round hole at the upper end of the second fixing block coincides with the position of the second round holes on both sides of the middle of the cross block, allowing the insertion rod to pass through and achieving a stable connection between the first fixing block and the second fixing block.

[0013] Preferably, the upper middle part of the fixing block two is movably provided with a fixing rod whose top end is fixed to the middle part of the bottom end of the insertion block.

[0014] By adopting the above technical solution, the fixing rod is movably located at the middle of the upper end of the fixing block 2, and its top end is fixed to the middle of the bottom end of the insertion block, so that the insertion block can be rotatably connected.

[0015] Preferably, the outer surface of the plunger head is provided with multi-level pressure equalization grooves of varying depths, and guide grooves for assisting glue flow are provided between the multi-level pressure equalization grooves.

[0016] By adopting the above technical solution, the multi-stage pressure equalization grooves and flow guide grooves opened on the outer surface of the plunger head can both balance the pressure and assist the flow of the rubber material.

[0017] Preferably, a slider is slidably disposed on the inner side of the end of the material cylinder near the nozzle, and a ball that slides inside the guide groove is fixed at the bottom end of the slider.

[0018] By adopting the above technical solution, a sliding slider is provided on the inner side of the barrel near the nozzle, which provides flexible adjustment function for the device. The ball at the bottom of the slider slides in the guide groove, which helps to keep the inside of the guide groove clean.

[0019] Preferably, the plunger head has a main pipe and multiple return pipes communicating with the main pipe inside.

[0020] By adopting the above technical solution, the main pipe inside the plunger head is interconnected with multiple return pipes, forming a special fluid channel structure that makes it easy for excess rubber to be returned and reused.

[0021] Preferably, a leak-proof elastic sealing ring is fixedly fitted in the middle of the plunger head between the multi-stage pressure equalization groove and the quick-release mechanism.

[0022] By adopting the above technical solution, an elastic sealing ring is fixedly sleeved in the middle of the plunger head between the multi-stage pressure equalization groove and the quick-release mechanism, which can effectively prevent leakage and ensure the stability and safety of the injection molding process.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. The multi-stage pressure equalization grooves on the surface of the plunger head facilitate the adaptation to pressure gradients in different sections, reducing the risk of jamming between the plunger body and the barrel; the guide grooves between the multi-stage pressure equalization grooves promote axial flow of the rubber material and reduce rubber material retention. Through the cooperation of the main pipe and the return pipe, the rubber material accumulated at the front end of the plunger head flows back to the tail end of the barrel, preventing the accumulation or leakage of rubber material in the device.

[0025] 2. By pulling apart the insert blocks, the two insert rods are disengaged from the first and second round holes, allowing the first and second fixing blocks to separate quickly. This facilitates the rapid installation and replacement of the plunger head, reduces downtime for maintenance, and improves production efficiency. The sliding block and ball on the inner wall of the barrel facilitate the cleaning of the outer surface guide grooves during the reciprocating motion of the plunger head. This device not only prevents the accumulation of residual material but also ensures uniform material flow, thereby improving injection molding quality. Attached Figure Description

[0026] Figure 1 This is a frontal axonometric schematic diagram of this application;

[0027] Figure 2 This is a partial sectional view of this application;

[0028] Figure 3 This is a partial internal structure diagram of this application;

[0029] Figure 4 for Figure 2 Enlarged view of point A in the middle;

[0030] Figure 5 This is a schematic diagram of the quick-release mechanism structure of this application;

[0031] Figure 6 This application provides a schematic diagram of the cross-shaped block structure.

[0032] Reference numerals: 1. Plunger head; 2. Quick release mechanism; 3. Barrel; 4. Nozzle; 5. Return pipe; 6. Return hole; 7. Annular groove; 8. Slider; 9. Ball; 10. Multi-stage equalizing groove; 11. Guide groove; 12. Sealing ring; 13. Main pipe; 14. Plunger rod;

[0033] 201. Fixing block one; 202. Fixing block two; 203. Cross block; 204. Cross groove; 205. Round hole one; 206. Round hole two; 207. Circular groove; 208. Spring; 209. Fixing rod; 210. Insert block; 211. Insert rod. Detailed Implementation

[0034] The following is in conjunction with the appendix Figure 1 - Figure 6 This application will be described in further detail.

[0035] This application discloses an injection-molded plunger head.

[0036] Reference Figure 1 An injection plunger head includes a plunger head 1 and a barrel 3 movably sleeved on the outside of the plunger head 1. The barrel 3 is used to contain plastic particles. A nozzle 4 is fixed at one end of the barrel 3. The nozzle 4 is used to inject molten colloid into the mold. A plunger rod 14 is fixed at the end of the plunger head 1 away from the nozzle 4. A quick-release mechanism 2 is fixed on the side of the plunger rod 14 away from the plunger head 1. The quick-release mechanism 2 is used to quickly install or replace the plunger head 1.

[0037] Before use, the device is fixed to the injection drive mechanism on the injection molding machine by fixing the fixing block 202 of the quick release mechanism 2, so that the plunger head 1 and the plunger rod 14 are installed as a whole into the inside of the barrel 3, plastic particles are poured into the inside of the plunger head 1, the plastic particles are melted by the heating system, and the plunger head 1 and the plunger rod 14 are driven to move horizontally back and forth inside the barrel 3 by the injection drive mechanism. Finally, the melted rubber is injected into the mold through the nozzle 4.

[0038] Reference Figure 5 , Figure 6 The quick-release mechanism 2 includes a first fixing block 201 and a second fixing block 202 that engages with the first fixing block 201. A cross block 203 is fixed to the side of the first fixing block 201 facing the second fixing block 202, and a cross groove 204 is fixed to the side of the second fixing block 202 facing the cross block 203. The cross block 203 is shaped to match the first fixing block 202. Figure 5As shown, two circular holes 205 are opened on both sides of the upper end of the fixing block 202 to the middle of the cross groove 204. Two circular holes 206 are opened at both ends of the middle of the cross block 203. The circular holes 206 are the same size as the circular holes 205. When the fixing block 201 and the fixing block 202 are closed, the two circular holes 205 and the two circular holes 206 coincide. An insert block 210 is movably mounted on the upper surface of the fixing block 202. Two insert rods 211 are fixedly mounted on the bottom end of the insert block 210 facing the fixing block 201. The top of 11 is fixed to the bottom of the insert block 210. The two insert rods 211 are respectively inserted into the two round holes 205 and 206. A fixing rod 209 is fixed on the side of the bottom of the insert block 210 away from the fixing block 201. A circular groove 207 is opened in the middle of the upper end of the fixing block 202. The fixing rod 209 is movably inserted into the circular groove 207. A spring 208 is sleeved on the lower end of the fixing rod 209. The two ends of the spring 208 are fixed to the lower end surface of the fixing rod 209 and the inner bottom surface of the circular groove 207, respectively.

[0039] When installing the plunger head 1, pulling the insert block 210 outward causes the fixing rod 209 to move outward inside the circular groove 207, and the two insert rods 211 follow the movement of the insert block 210 and disengage from the circular hole 205. At this time, the spring 208 fixed at the bottom of the fixing rod 209 is stretched. Subsequently, the cross block 203 fixed on one side of the fixing block 201 is inserted into the cross groove 204 opened on one side of the fixing block 202. Because when the fixing block 201 and the cross block 203 are closed, the circular hole 205 and the... When the second round hole 206 overlaps, release the insert block 210 to allow the spring 208 to return, which in turn causes the fixing rod 209 and the insert rod 211 to return, allowing the two insert rods 211 to be inserted into the first round hole 205 and the second round hole 206 respectively, thus fixing the first fixing block 201 and the second fixing block 202. When disassembling or replacing the plunger head 1, pull the insert block 210 again to disengage the two insert rods 211 from the first round hole 205 and the second round hole 206. After replacing with a new or different model of plunger head 1, release the insert block 210.

[0040] Reference Figure 3 , Figure 4The outer surface of the plunger head 1 is provided with multi-stage pressure equalization grooves 10. The depth of each pressure equalization groove 10 varies in a gradient, that is, the grooves closer to the quick-release mechanism 2 are deeper and the grooves farther away from the quick-release mechanism 2 are shallower. This is used to release the radial pressure of the plunger head 1 in stages, reduce the clamping force between the plunger head 1 and the barrel 3 during injection, and thus avoid the problem of abrasion on the inner wall of the barrel 3 caused by the movement of the plunger head 1. In addition, a guide groove 11 is provided between each pressure equalization groove of the multi-stage pressure equalization groove 10. The guide groove 11 is used to promote the axial flow of the rubber material and reduce the retention of the rubber material. The guide groove 11 and the multi-stage pressure equalization groove 10 are connected to the barrel 3. The connection points of the equalizing grooves 10 are interconnected and have a smooth transition. An annular groove 7 is provided on the inner side of the end of the material cylinder 3 near the nozzle 4. The cross-section of the annular groove 7 is convex. A slider 8 is slidably installed inside the annular groove 7. The shape of the slider 8 matches the annular groove 7, and its side is semi-circular. It should be noted that the annular groove 7 can also be made by splicing the material cylinder 3 together. That is, the material cylinder 3 is welded and fixed at the radial center of the annular groove 7. The material cylinder 3 is made of two parts to facilitate the installation of the slider 8. The protruding end of the slider 8 protrudes from the inner wall of the material cylinder 3 (e.g., ...). Figure 4 As shown), a ball 9 is fixed at the bottom of the slider 8. The ball 9 slides inside the guide groove 11. The surface of the ball 9 is in close contact with the inner wall of the guide groove 11. The ball 9 is used to scrape off the adhesive residue inside the guide groove 11.

[0041] In use, the plunger head 1 and plunger rod 14 reciprocate horizontally inside the barrel 3, causing the multi-stage equalizing groove 10 to gradually balance the radial pressure, adapting to the pressure gradient in different sections and reducing the risk of jamming. The guide groove 11 promotes the axial flow of the rubber material. When there is rubber material remaining in the guide groove 11, the ball 9 slides inside the guide groove 11. The reciprocating motion of the plunger head 1 causes the ball 9 to drive the slider 8 to rotate in the annular groove 7, thereby scraping away the residual rubber material inside the guide groove 11, allowing the rubber material to flow back into the gap between the inner wall of the barrel 3 and the outer surface of the plunger head 1.

[0042] Reference Figure 2 The plunger head 1 has a main pipe 13 and multiple return pipes 5 that are connected to the main pipe 13. The main pipe 13 and multiple return pipes 5 are Y-shaped. The two ends of the entire channel are connected to the front end and the end of the material cylinder 3, respectively, to avoid leakage of excess adhesive. The inner wall of the entire channel is coated with polytetrafluoroethylene to reduce adhesive adhesion and facilitate subsequent cleaning. Multiple return holes 6 are opened on the outer ring of the side of the plunger head 1 facing the quick release mechanism 2. The multiple return holes 6 are connected to the multiple return pipes 5.

[0043] After one injection of adhesive is completed, the excess adhesive is diverted through the main pipe 13 to multiple return pipes 5, and then flows out through multiple return holes 6 to the inside of the barrel 3 near the quick release mechanism 2, so that the excess adhesive is remelted for the next injection.

[0044] The plunger head 1 is fixedly fitted with a leak-proof elastic sealing ring 12 between the multi-stage pressure equalization groove 10 and the quick-release mechanism 2. The sealing ring 12 is made of polyetheretherketone, which is suitable for long-term operation in environments with continuous operating temperatures of 250 degrees or even higher. It can maintain stable mechanical properties under high temperature conditions and can fit tightly against the inner wall of the barrel 3 under high pressure, thereby achieving automatic compensation for wear gaps generated during actual use.

[0045] When the device experiences minor wear or gaps between the barrel 3 and the sealing ring 12 due to friction or prolonged use, the high pressure causes the sealing ring 12 to undergo necessary elastic compression along its contact section, allowing it to automatically fill and compensate for the gaps formed by wear, thereby continuously maintaining the device's sealing performance.

[0046] The implementation principle of an injection plunger head according to an embodiment of this application is as follows: Before use, the plunger head 1 and plunger rod 14 are inserted into the barrel 3 as a whole, and plastic particles are injected. After being heated and melted, the material is injected into the mold through the nozzle 4 by horizontal reciprocating motion. During installation, the fixed rod 209 and the insert rod 211 are moved by pulling the insert block 210, and the spring 208 is extended and retracted to quickly fix the first fixed block 201 and the second fixed block 202. When disassembling or replacing, the plunger head 1 can be replaced by repeating the operation. During operation, the ball 9 and the slider 8 slide inside the annular groove 7 to remove the residual material inside the guide groove 11. The excess material is returned to the main pipe 13 and the return pipe 5 for remelting.

[0047] The above are merely optional embodiments of this disclosure and are not intended to limit this disclosure. Various modifications and variations can be made to this disclosure by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the scope of protection of this disclosure.

Claims

1. An injection-molded plunger head, characterized in that: Includes a plunger head (1) and a cylinder (3) movably sleeved on the outside of the plunger head (1) to accommodate plastic particles. One end of the cylinder (3) is fixed with a nozzle (4) for injecting colloid. The plunger head (1) is fixed with a plunger rod (14) at the end away from the nozzle (4). The plunger rod (14) is fixed with a quick-release mechanism (2) at the end away from the plunger head (1) to facilitate the replacement of the plunger head (1). The quick-release mechanism (2) includes a first fixing block (201) and a second fixing block (202) that is engaged with the first fixing block (201). The upper ends of the second fixing block (202) are provided with insert rods (211) on both sides, and the top ends of the two insert rods (211) are fixed with insert blocks (210).

2. The injection-molded plunger head according to claim 1, characterized in that: A cross block (203) is fixed on the side of the fixing block one (201) facing the fixing block two (202), and a cross groove (204) adapted to the shape of the cross block (203) is fixed on the side of the fixing block two (202) facing the cross block (203).

3. The injection-molded plunger head according to claim 2, characterized in that: The upper end of the fixing block 2 (202) is provided with two circular holes 1 (205), and the middle part of the cross block (203) is provided with two circular holes 2 (206) that are the same shape and coincide with the circular holes 1 (205) on both sides. The two insertion rods (211) respectively pass through the circular holes 1 (205) and the circular holes 2 (206).

4. The injection-molded plunger head according to claim 1, characterized in that: The upper middle part of the fixed block 2 (202) is provided with a fixing rod (209) whose top end is fixed to the middle part of the bottom end of the insert block (210).

5. The injection-molded plunger head according to claim 1, characterized in that: The outer surface of the plunger head (1) is provided with multi-level pressure equalization grooves (10) of varying depths, and a flow guide groove (11) for assisting the flow of adhesive is provided between the multi-level pressure equalization grooves (10).

6. The injection-molded plunger head according to claim 1, characterized in that: A slider (8) is slidably provided on the inner side of the end of the material cylinder (3) near the nozzle (4), and a ball (9) that slides inside the guide groove (11) is fixed at the bottom end of the slider (8).

7. The injection-molded plunger head according to claim 1, characterized in that: The plunger head (1) has a main pipe (13) and multiple return pipes (5) that are connected to the main pipe (13).

8. The injection-molded plunger head according to claim 1, characterized in that: The plunger head (1) is located between the multi-stage equalizing groove (10) and the quick-release mechanism (2) and is fitted with a leak-proof elastic sealing ring (12).

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