A shell injection molding device and process for LED screen

Abstract

The application relates to the technical field of injection molding, and discloses a shell injection molding device and process for an LED screen, wherein the device comprises a mold frame, a fixed die is installed on the mold frame, a movable die is slidably installed on the mold frame, the movable die is located above the fixed die, and the movable die is driven to ascend and descend by a first driving source; when the fixed die and the movable die are closed, any guide rod is monitored by a monitoring assembly; when it is necessary to smear lubricating oil on all the guide rods, the second driving sources in all the hollow bosses drive the two moving blocks to approach each other until the two oil smearing cotten form a ring-shaped wrapping on the outer cylindrical surface of the guide rod; then the oil feeding assembly feeds lubricating oil into the cavities, the oil smearing cotten absorbs the lubricating oil; when the mold is opened, the guide rod rises, at this moment, the oil smearing cotten directly smears the lubricating oil on the guide rod, so that the lubricating task can be completed under the condition that production is not stopped, and the operation of smearing lubricating oil on all the guide rods is simultaneously performed, thereby greatly shortening the non-production time.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of injection molding, in particular to a shell injection molding device and process for LED screen. BACKGROUND

[0002] The shell injection molding device for LED screen is an automatic mechanical equipment specially designed for producing the peripheral frame of LED display screen, mainly adopting injection molding technology, and can batch and efficiently generate plastic parts with high precision and strong weather resistance.

[0003] When the existing injection molding device produces a shell, the plastic particles are first heated to a molten state and injected into the mold cavity of the closed mold. After the plastic solidifies and forms, the mold is opened (i.e., the mold is separated), and then the shell can be removed.

[0004] During the injection molding process, the precise fit between the guide rod and the through hole is crucial to ensure the accuracy of mold closing and mold opening. However, with high-frequency operation, these critical parts are prone to wear and tear, and timely lubrication is necessary. The current common manual application method is carried out in the state of mold opening. Usually, the operator uses a brush to apply lubricating oil to the guide rod one by one. On the one hand, manual operation takes a long time. On the other hand, due to the structure of the mold, the parts of the guide rod located in the deep interior are often difficult to reach, resulting in incomplete coverage of manual lubrication. Therefore, the present application provides a shell injection molding device and process for LED screen that can uniformly apply lubricating oil to all guide rods during production. SUMMARY

[0005] The present application aims to overcome the shortcomings of the prior art and provide a shell injection molding device and process for LED screen to solve the technical problems in the prior art.

[0006] The purpose of the present application can be achieved by the following technical solutions:

[0007] A shell injection molding device for LED screen, comprising:

[0008] A mold frame is fixedly installed with a fixed mold, and a movable mold is slidingly installed thereon. The movable mold is located above the fixed mold and is driven to lift by a first drive source. The movable mold is in communication with a plunger type material conveying assembly. The bottom corners of the movable mold are provided with grooves. Each groove is fixedly installed with a guide rod. Each guide rod has a corresponding through hole. The through hole is provided on the fixed mold and is coaxially arranged with the guide rod.

[0009] Hollow bosses, four hollow bosses corresponding to four guide rods respectively, the hollow bosses are fixedly mounted on the fixed mold, matched with the grooves, and aligned with the through holes. When the movable mold and the fixed mold are closed, the guide rods pass through the hollow bosses and the through holes in sequence;

[0010] A monitoring component is provided on the fixed mold, and when the fixed mold and the movable mold are closed, the monitoring component monitors whether the guide rod needs to be lubricated;

[0011] The moving blocks are symmetrically arranged in the hollow boss, and the moving blocks are slidably installed in the hollow boss, and the two moving blocks are driven by two second driving sources to move toward each other. A cavity is opened in the moving block, and oil-coated cotton is arranged in the cavity, and it is connected with the oil delivery component. When the monitoring component detects that the guide rod needs to be lubricated, the second driving source drives the two moving blocks to approach each other until the two oil-coated cottons form a ring wrapped around the outer surface of the guide rod. At this time, the oil delivery component delivers the lubricating oil into the cavity, and the oil-coated cotton will absorb the lubricating oil and apply it on the guide rod when the fixed mold and the movable mold are separated.

[0012] As a further solution of the present invention: the oil delivery component includes a liquid inlet and a liquid infusion tube, the liquid inlet is opened on the moving block, and is connected to the cavity, the liquid infusion tube is arranged through the fixed mold, and its input end is located at the bottom of the fixed mold, and this end is connected to the oil supply component, and the output end of the liquid infusion tube is located in the hollow boss, when the second driving source drives the moving block to move until the oil-coated cotton abuts against the guide rod, the output end of the liquid infusion tube is connected to the cavity through the liquid inlet; when the second driving source drives the moving block to retract into the hollow boss, the liquid infusion tube and the liquid inlet are misaligned, and the moving block blocks the output end of the liquid infusion tube.

[0013] As a further solution of the present invention: a lower oil channel is opened at the bottom of the movable block, and the lower oil channel is connected to the cavity; a recovery groove is opened at the bottom of the hollow boss, and the recovery groove is connected to the through hole through the oil outlet hole, and when the output end of the infusion tube is connected to the cavity through the liquid inlet, the recovery groove is connected to the cavity.

[0014] As a further solution of the present invention: the recovery groove is always connected to the cavity, and an extrusion component is provided in the hollow boss. When the second driving source drives the moving block to retract into the hollow boss, the extrusion component will squeeze the oiled cotton and squeeze out the lubricating oil in the oiled cotton.

[0015] As a further solution of the present invention: the extrusion assembly includes an oil squeezing plate, a T-shaped rod, a spring and an electric telescopic rod. The oil squeezing plate is slidably installed in the moving block and fits the outer arc surface of the oiled cotton. One end of the T-shaped rod passes through the moving block and is fixedly connected to the oil squeezing plate, and the other end is connected to the moving block through a spring. The pre-tightening force of the spring pushes the T-shaped rod away from the moving block. The electric telescopic rod is fixedly installed in the hollow boss. When the movable end of the electric telescopic rod extends, it pushes the T-shaped rod close to the moving block.

[0016] As a further solution of the present invention: the extrusion assembly also includes a receiving groove and a baffle, the receiving groove is opened in the hollow boss, the baffle is slidably installed in the receiving groove, and is driven to rise and fall by a third driving source. When the baffle is located in the receiving groove, it is located above the moving block; when the second driving source drives the moving block to retract into the hollow boss, the baffle descends, and its outer arc surface fits with the inner arc surface of the oiled cotton.

[0017] As a further solution of the present invention: the monitoring component includes an annular block and a temperature monitoring component, the annular block is fixedly installed at the bottom of the fixed mold, and multiple temperature monitoring components are circumferentially arranged in the annular block. When the fixed mold and the movable mold are closed, the guide rod passes through the middle of the annular block and the two are coaxial. At this time, multiple temperature monitoring components monitor the temperature of the outer surface of the guide rod.

[0018] A process for injection molding a housing for an LED screen, the process being applied to the above-mentioned device for injection molding a housing for an LED screen, the process comprising the following steps:

[0019] Step S1: The first driving source drives the movable mold to descend, the guide rod passes through the hollow boss and the through hole in sequence, and the hollow boss enters the groove, at which point the movable mold and the fixed mold are closed;

[0020] Step S2: The plunger-type feeding component pushes the molten plastic into the cavity between the movable mold and the fixed mold to fill the mold cavity, while the monitoring component monitors whether the guide rod needs to be lubricated;

[0021] Step S3: The monitoring component determines that the guide rod does not need to be lubricated, and the movable mold and the fixed mold can be opened to take out the finished product after the plastic is completely cooled, solidified and hardened;

[0022] Step S4: If the monitoring component determines that the guide rod needs to be lubricated, the second driving source drives the two moving blocks closer to each other while waiting for cooling, until the two oiling cottons form a ring and wrap around the outer surface of the guide rod. Then, the oil delivery component delivers the lubricating oil into the cavity, and the oiling cottons absorb the lubricating oil.

[0023] Step S5: When the mold is opened, the guide rod will rise, and the oiling cotton will apply lubricating oil directly to the guide rod.

[0024] Beneficial effects of the present invention:

[0025] 1. In the present invention, a monitoring component monitors any guide rod when the movable mold and the fixed mold are closed. When lubricating oil needs to be applied to all guide rods, the second driving source in all hollow bosses drives the two moving blocks to approach each other until the two oiling cottons form a ring and wrap around the outer surface of the guide rod. Then, the oil delivery component delivers the lubricating oil into the cavity, and the oiling cottons absorb the lubricating oil. When the mold is subsequently opened, the guide rod rises, and the oiling cottons directly apply the lubricating oil to the guide rod. In this way, the lubrication task can be completed without stopping production, and the operation of applying lubricating oil to all guide rods at the same time can greatly shorten the non-production time and improve the efficiency of producing injection molded shells.

[0026] 2. In the present invention, when the lubricating oil enters the cavity, it will be absorbed by the oil-coated cotton. After the oil-coated cotton is fully absorbed by the lubricating oil, the lubricating oil will continue to sink under the action of gravity and will leak out from the oil-coated cotton into the lower oil channel. The lubricating oil in the lower oil channel will enter the recovery tank and flow out through the oil outlet hole in the recovery tank. As can be seen from the figure, the lubricating oil flowing out of the oil outlet hole will enter the through hole, thereby playing the role of lubricating the through hole;

[0027] 3. In the present invention, the lubricating oil in the oil-coated cotton is squeezed out by the extrusion component, and the squeezed lubricating oil flows out from the lower oil channel and eventually enters the through hole, playing the role of lubricating the through hole, while avoiding the waste of lubricating oil in the oil-coated cotton and improving the utilization rate of the lubricating oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The present invention will be further described below with reference to the accompanying drawings.

[0029] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0030] Figure 2 It is a structural schematic diagram of the bottom of the fixed mold in the present invention;

[0031] Figure 3 It is a schematic structural diagram of the cross-section of the hollow boss in the present invention;

[0032] Figure 4 It is a schematic structural diagram of the cross-section of the hollow boss in the present invention;

[0033] Figure 5 It is a schematic structural diagram of a transverse cross-section of the movable block in the present invention;

[0034] Figure 6 It is a schematic structural diagram of a longitudinal section of the movable block in the present invention;

[0035] Figure 7 It is a structural schematic diagram of the hollow boss and the guide rod in the present invention;

[0036] Figure 8 This is a schematic diagram of the structure of the contact between the moving block and the guide rod in the present invention;

[0037] Figure 9 This is a schematic structural diagram of the oil-coated cotton contact guide rod in the present invention;

[0038] Figure 10 This is a schematic structural diagram of the oil squeezing plate squeezing the oiled cotton in the present invention;

[0039] Figure 11 This is a schematic diagram of the oil outlet hole and through hole position structure in the present invention;

[0040] Figure 12 It is a structural schematic diagram of the annular block in the present invention.

[0041] In the figure: 1. Mold frame; 2. Fixed mold; 3. Moving mold; 4. Plunger-type feeding assembly; 5. Guide rod; 6. Through hole; 7. Hollow boss; 8. Moving block; 9. Oiling cotton; 10. Liquid inlet; 11. Cavity; 12. Liquid infusion tube; 13. Oil lower channel; 14. Recovery tank; 15. Oil outlet hole; 16. Receiving tank; 17. Baffle; 18. Oil squeezing plate; 19. T-bar; 20. Spring; 21. Electric telescopic rod; 22. Ring block; 23. Temperature monitoring assembly; 24. Groove. DETAILED DESCRIPTION

[0042] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0043] See also Figures 1-12 As shown, the present invention is a shell injection molding device for an LED screen, comprising:

[0044] A mold frame 1, on which a fixed mold 2 is fixedly mounted, and a movable mold 3 is slidably mounted. The movable mold 3 is located above the fixed mold 2 and is driven to rise and fall by a first drive source. The movable mold 3 is connected to a plunger-type feeding assembly 4. Grooves 24 are provided at the four corners of the bottom of the movable mold 3. A guide rod 5 is fixedly mounted in each groove 24. Each guide rod 5 has a corresponding through hole 6. The through hole 6 is provided on the fixed mold 2 and is coaxially arranged with the guide rod 5.

[0045] Hollow bosses 7, four hollow bosses 7 correspond to four guide rods 5 respectively. The hollow bosses 7 are fixedly mounted on the fixed mold 2, cooperate with the grooves 24, and are aligned with the through holes 6. When the movable mold 3 and the fixed mold 2 are closed, the guide rods 5 pass through the hollow bosses 7 and the through holes 6 in sequence;

[0046] A monitoring component is provided on the fixed mold 2. When the fixed mold 2 and the movable mold 3 are closed, the monitoring component monitors whether the guide rod 5 needs to be lubricated;

[0047] Moving blocks 8, two moving blocks 8 are symmetrically arranged in the hollow boss 7, the moving blocks 8 are slidably installed in the hollow boss 7, and the two moving blocks 8 are driven by two second driving sources to move toward each other, a cavity 11 is opened in the moving block 8, and oiled cotton 9 is arranged in the cavity 11, and it is connected to the oil delivery component. When the monitoring component monitors that the guide rod 5 needs to be lubricated, the second driving source drives the two moving blocks 8 to approach each other until the two oiled cottons 9 form a ring wrapped around the outer surface of the guide rod 5. At this time, the oil delivery component transports the lubricating oil into the cavity 11, and the oiled cotton 9 will absorb the lubricating oil and apply it on the guide rod 5 when the fixed mold 2 and the movable mold 3 are separated.

[0048] In one case of this embodiment, the first driving source and the second driving source can both be electric reciprocating cylinders, hydraulic telescopic rods and other components, and other mechanisms that can achieve linear reciprocating motion can also be selected. This embodiment is not specifically limited here. It should be noted that the plunger-type feeding assembly 4 described in the present invention is a prior art, and the present invention does not improve them. Therefore, there is no need to disclose their specific mechanical structure and circuit structure, which does not affect the integrity of the present invention.

[0049] The working principle of the present invention is as follows: first, the movable mold 3 is driven down by the first driving source, and the guide rod 5 passes through the hollow boss 7 and the through hole 6 in sequence, and the hollow boss 7 enters the groove 24. At this time, the movable mold 3 and the fixed mold 2 are closed. Then, the plunger-type feeding component 4 pushes the molten plastic to fill the mold cavity between the movable mold 3 and the fixed mold 2. The shell of the LED screen will be formed in the mold cavity. After the plastic is completely cooled and solidified, the movable mold 3 and the fixed mold 2 are opened and the finished product is taken out, thus completing the process of shell injection molding.

[0050] Each time the movable mold 3 and the fixed mold 2 are closed or opened, the guide rod 5 and the through hole 6 need to cooperate. Frequent operation will cause the lubricating oil on the guide rod 5 to decrease. If the lubricating oil is not added in time, the cooperation between the guide rod 5 and the through hole 6 will be affected, thereby causing adverse effects on the closing of the mold. Therefore, a monitoring component is added to judge whether the guide rod 5 needs to be lubricated.

[0051] like Figure 3 As shown in the figure, the moving block 8 is retracted in the hollow boss 7 in the default state. At this time, there is an obvious gap between the two moving blocks 8. The guide rod 5 will not come into contact with the moving block 8 and the oiling cotton 9 when passing through the hollow boss 7. After each mold closing, the monitoring component will make a judgment. When lubricating oil needs to be applied, while waiting for the finished product in the mold cavity of the movable mold 3 and the fixed mold 2 to cool down, as shown in FIG. Figure 8As shown in the figure, the two moving blocks 8 are driven to approach each other by the second driving source until the two oil-coated cotton balls 9 form a ring wrapped around the outer surface of the guide rod 5, and then the oil delivery component delivers the lubricating oil to the cavity 11, and the oil-coated cotton balls 9 absorb the lubricating oil. Then, when the mold is opened, the guide rod 5 will rise, and the oil-coated cotton balls 9 will apply the lubricating oil directly to the guide rod 5. It should be noted that the monitoring component monitors any guide rod 5. Once a guide rod 5 needs to be coated, all guide rods 5 will be coated with lubricating oil through the oil-coated cotton balls 9 inside all hollow bosses 7.

[0052] like Figure 3-Figure 11 As shown, as a preferred embodiment of the present invention, the oil delivery component includes a liquid inlet 10 and a liquid infusion tube 12, the liquid inlet 10 is opened on the moving block 8, and is connected to the cavity 11, the liquid infusion tube 12 is arranged through the fixed mold 2, and its input end is located at the bottom of the fixed mold 2, and this end is connected to the oil supply component, the output end of the liquid infusion tube 12 is located in the hollow boss 7, when the second driving source drives the moving block 8 to move until the oil-coated cotton 9 abuts against the guide rod 5, the output end of the liquid infusion tube 12 is connected to the cavity 11 through the liquid inlet 10; when the second driving source drives the moving block 8 to retract into the hollow boss 7, the liquid infusion tube 12 is misaligned with the liquid inlet 10, and the moving block 8 blocks the output end of the liquid infusion tube 12.

[0053] In one case of this embodiment, it should be noted that the oil supply assembly of the present invention includes an oil storage tank, a power pump and connecting pipes, etc. The above components are prior art and the present invention does not improve them. Therefore, there is no need to disclose their specific mechanical structure and circuit structure, which does not affect the integrity of the present invention.

[0054] In practical application, if Figure 3 As shown in the example, when the moving block 8 is in the default state, the liquid inlet 10 and the liquid infusion tube 12 are misaligned, and Figure 8 As shown, when the moving block 8 moves to the position where the oiled cotton 9 is wrapped around the surface of the guide rod 5, the liquid inlet 10 and the infusion tube 12 are aligned. Figure 9 It can be clearly seen that the lubricating oil is then transported through the infusion tube 12 by the oil supply assembly, and then enters the cavity 11 from the liquid inlet 10, so that the oiled cotton 9 is immersed in the lubricating oil, thereby fully absorbing the lubricating oil, and the input end of the infusion tube 12 is located at the bottom of the fixed mold 2, and the oil supply assembly can be set outside the fixed mold 2, which is convenient for installation and maintenance.

[0055] like Figure 3-Figure 11As shown, as a preferred embodiment of the present invention, a lower oil channel 13 is provided at the bottom end of the movable block 8, and the lower oil channel 13 is connected to the cavity 11. A recovery groove 14 is provided at the bottom end of the hollow boss 7, and the recovery groove 14 is connected to the through hole 6 through the oil outlet hole 15, and when the output end of the infusion tube 12 is connected to the cavity 11 through the liquid inlet 10, the recovery groove 14 is connected to the cavity 11.

[0056] In practical application, this embodiment Figure 6 It can be seen that when the lubricating oil enters the cavity 11, it will be absorbed by the oiling cotton 9. After the oiling cotton 9 is fully absorbed by the lubricating oil, the lubricating oil continues to sink under the action of gravity and leaks from the oiling cotton 9 into the oil channel 13. Figure 9 It can be seen that the lubricating oil in the lower oil channel 13 will enter the recovery tank 14, flow out through the oil outlet 15 in the recovery tank 14, and then flow out from the oil outlet 15. Figure 11 It can be seen that the lubricating oil flowing out of the oil outlet hole 15 will enter the through hole 6 , thereby playing a role in lubricating the through hole 6 .

[0057] like Figure 3-Figure 11 As shown, as a preferred embodiment of the present invention, the recovery groove 14 is always connected to the cavity 11, and an extrusion component is provided in the hollow boss 7. When the second driving source drives the moving block 8 to retract into the hollow boss 7, the extrusion component will squeeze the oiled cotton 9 to squeeze out the lubricating oil in the oiled cotton 9.

[0058] In actual application of this embodiment, since the oil-coated cotton 9 is coated with lubricating oil by contacting with the guide rod 5, the interior of the oil-coated cotton 9 away from the guide rod 5 is still soaked with lubricating oil. In this way, after the moving block 8 contracts, the lubricating oil in the oil-coated cotton 9 is squeezed out by the extrusion component, and the squeezed lubricating oil flows out from the lower oil channel 13 and eventually enters the through hole 6, playing the role of lubricating the through hole 6, while avoiding the waste of lubricating oil in the oil-coated cotton 9 and improving the utilization rate of the lubricating oil.

[0059] like Figure 3-Figure 11 As shown, as a preferred embodiment of the present invention, the extrusion assembly includes an oil squeezing plate 18, a T-shaped rod 19, a spring 20 and an electric telescopic rod 21. The oil squeezing plate 18 is slidably installed in the moving block 8, and it fits the outer arc surface of the oil-coated cotton 9. One end of the T-shaped rod 19 passes through the moving block 8 and is fixedly connected to the oil squeezing plate 18, and the other end is connected to the moving block 8 through the spring 20. The pre-tightening force of the spring 20 pushes the T-shaped rod 19 away from the moving block 8. The electric telescopic rod 21 is fixedly installed in the hollow boss 7. When the movable end of the electric telescopic rod 21 extends, it pushes the T-shaped rod 19 close to the moving block 8.

[0060] In one case of the embodiment, it is to be noted that the electric telescopic rod 21 is a prior art, and the present application does not improve it, so the specific mechanical structure and circuit structure thereof do not need to be disclosed, and the integrity of the present application is not affected.

[0061] In actual application, as shown in Figure 5 It can be seen that the oil squeezing plate 18 is attached to the oil applying cotton 9, when the electric telescopic rod 21 pushes the T-shaped rod 19 to compress the spring 20, the oil squeezing plate 18 will be pushed to squeeze the oil applying cotton 9, so as to squeeze out the lubricating oil in the oil applying cotton 9, and the shape of the oil squeezing plate 18 is also attached to the shape of the oil applying cotton 9, which can press the oil applying cotton 9 in a large area, ensuring that the lubricating oil in the oil applying cotton 9 is squeezed out sufficiently, and when the electric telescopic rod 21 is retracted, the T-shaped rod 19 will move away from the moving block 8 under the elastic force of the spring 20, at this time the oil squeezing plate 18 will not squeeze the oil applying cotton 9.

[0062] As shown in Figure 3-10 As a preferred embodiment of the present application, the squeezing assembly further comprises a receiving groove 16 and a baffle 17, the receiving groove 16 is opened in the hollow boss 7, and the baffle 17 is slidingly installed in the receiving groove 16 and is driven to rise and fall by a third driving source, when the baffle 17 is located in the receiving groove 16, it is located above the moving block 8; when the second driving source drives the moving block 8 to retract into the hollow boss 7, the baffle 17 is lowered, and its outer arc surface is attached to the inner arc surface of the oil applying cotton 9.

[0063] In one case of the embodiment, the third driving source can be selected from an electric cylinder, a reciprocating retractable rod and other mechanisms capable of realizing lifting motion, which is not specifically limited in the embodiment.

[0064] In actual application, as shown in Figure 8 and Figure 9 When the baffle 17 rises completely into the receiving groove 16, it will not block the movement of the moving block 8, and the moving block 8 can be moved to be attached to the guide rod 5, and when the moving block 8 is retracted into the hollow boss 7, before passing through the oil squeezing plate 18 to squeeze the oil applying cotton 9, as shown in Figure 10 the baffle 17 is first lowered by the third driving source, so that the outer arc surface of the baffle 17 is attached to the inner arc surface of the oil applying cotton 9, at this time the baffle 17 can prevent the oil applying cotton 9 from being pushed out of the original installation position by the oil squeezing plate 18.

[0065] As shown in Figure 12As shown, as a preferred embodiment of the present invention, the monitoring component includes an annular block 22 and a temperature monitoring component 23. The annular block 22 is fixedly installed at the bottom of the fixed mold 2, and multiple temperature monitoring components 23 are circumferentially arranged in the annular block 22. When the fixed mold 2 and the movable mold 3 are closed, the guide rod 5 passes through the middle of the annular block 22, and the two are coaxial. At this time, multiple temperature monitoring components 23 monitor the temperature of the outer surface of the guide rod 5.

[0066] In one case of this embodiment, it should be noted that the temperature monitoring components 23 described in the present invention are prior art, and the present invention does not improve them. Therefore, there is no need to disclose their specific mechanical structure and circuit structure, which does not affect the integrity of the present invention.

[0067] In actual application of this embodiment, the temperature of the outer cylindrical surface of the guide rod 5 is monitored by the temperature monitoring component 23. When the temperature exceeds the threshold value of the temperature monitoring component 23, it means that lubricating oil needs to be added. Because the guide rod 5 moves in the through hole 6 when the entire injection molding device is in mold closing and mold opening, the lubricating oil will be consumed in this process. Once the lubricating oil is lacking, the guide rod 5 will generate heat by friction in the through hole 6, so as to judge whether lubricating oil needs to be added, and the annular block 22 is installed at the bottom of the fixed mold 2 to ensure that the end of the guide rod 5 is monitored, because the end of the guide rod 5 can completely pass through the through hole 6 during mold closing and mold opening, which means that the lubricating oil is consumed the fastest, and the mold closing is also the area with the highest temperature on the guide rod 5, so it can be discovered in time whether the guide rod 5 needs to be lubricated.

[0068] See also Figures 1-12 As shown, the present invention is a process for injection molding a housing for an LED screen, which is applied to an injection molding device for an LED screen housing as described in the above embodiment, and the process includes the following steps:

[0069] Step S1: The first driving source drives the movable mold 3 to descend, and the guide rod 5 passes through the hollow boss 7 and the through hole 6 in sequence, and the hollow boss 7 enters the groove 24, at which point the movable mold 3 and the fixed mold 2 are closed;

[0070] Step S2: The plunger-type feeding component 4 pushes the molten plastic into the cavity between the movable mold 3 and the fixed mold 2 to fill the mold cavity. At the same time, the monitoring component monitors whether the guide rod 5 needs to be lubricated.

[0071] Step S3: The monitoring component determines that the guide rod 5 does not need to be lubricated, and the movable mold 3 and the fixed mold 2 are opened to take out the finished product after the plastic is completely cooled, solidified and hardened.

[0072] Step S4: If the monitoring assembly determines that the guide rod 5 needs to be coated with lubricating oil, then during the waiting cooling process, the two moving blocks 8 are driven to move closer to each other by the second driving source until the two oil-coated cottons 9 form a ring-shaped wrapping on the outer surface of the guide rod 5, and then the oil delivery assembly delivers lubricating oil into the cavity 11, and the oil-coated cottons 9 absorb the lubricating oil;

[0073] Step S5: When the mold is opened, the guide rod 5 will rise, and at this time the oil-coated cottons 9 will directly coat the lubricating oil on the guide rod 5.

[0074] The above describes one embodiment of the present application in detail, but the content described is only a preferred embodiment of the present application and cannot be considered as limiting the scope of the present application. Any equivalent changes and improvements made within the scope of the present application should still be attributed to the patent coverage of the present application.

Claims

1. A housing injection molding device for an LED screen, characterized in that: include: A mold frame (1) is fixedly mounted with a fixed mold (2) and slidably mounted with a movable mold (3), the movable mold (3) being located above the fixed mold (2) and being driven by a first driving source to be raised and lowered, and being connected to a plunger-type feeding assembly (4), the movable mold (3) being provided with grooves (24) at the four corners of the bottom thereof, a guide rod (5) being fixedly mounted in each groove (24), each guide rod (5) having a corresponding through hole (6), the through hole (6) being provided on the fixed mold (2) and being coaxially arranged with the guide rod (5); Hollow bosses (7), four hollow bosses (7) correspond to four guide rods (5) respectively, the hollow bosses (7) are fixedly mounted on the fixed mold (2), cooperate with the grooves (24), and are aligned with the through holes (6), and when the movable mold (3) and the fixed mold (2) are closed, the guide rods (5) pass through the hollow bosses (7) and the through holes (6) in sequence; A monitoring component is provided on the fixed mold (2), and when the fixed mold (2) and the movable mold (3) are closed, the monitoring component monitors whether the guide rod (5) needs to be smeared with lubricating oil; A moving block (8), wherein the two moving blocks (8) are symmetrically arranged in the hollow boss (7), the moving blocks (8) are slidably installed in the hollow boss (7), and the two moving blocks (8) are driven by two second driving sources to move toward each other, a cavity (11) is provided in the moving block (8), an oiling cotton (9) is provided in the cavity (11), and the cavity (11) is connected to the oil delivery component, and when the monitoring component monitors that the guide rod (5) needs to be smeared with lubricating oil, the second driving source drives the two moving blocks (8) to approach each other until the two oiling cottons (9) form a ring and wrap around the outer cylindrical surface of the guide rod (5), and at this time the oil delivery component delivers the lubricating oil into the cavity (11), and the oiling cotton (9) absorbs the lubricating oil and smears it on the guide rod (5) when the fixed mold (2) and the movable mold (3) are separated; The monitoring assembly comprises an annular block (22) and a temperature monitoring assembly (23). The annular block (22) is fixedly mounted on the bottom of the fixed mold (2). A plurality of temperature monitoring assemblies (23) are circumferentially arranged in the annular block (22). When the fixed mold (2) and the movable mold (3) are closed, the guide rod (5) passes through the middle of the annular block (22) and the two are coaxial. At this time, the plurality of temperature monitoring assemblies (23) monitor the temperature of the outer surface of the guide rod (5).

2. The LED screen housing injection molding device according to claim 1, characterized in that: The oil delivery component includes a liquid inlet (10) and a liquid delivery tube (12), wherein the liquid inlet (10) is provided on the movable block (8) and is communicated with the cavity (11), the liquid delivery tube (12) is arranged through the fixed mold (2), the input end of the liquid delivery tube (12) is located at the bottom of the fixed mold (2), and the input end is communicated with the oil supply component, and the output end of the liquid delivery tube (12) is located in the hollow boss (7). When the second driving source drives the movable block (8) to move until the oil-coated cotton (9) abuts against the guide rod (5), the output end of the liquid delivery tube (12) is communicated with the cavity (11) through the liquid inlet (10); when the second driving source drives the movable block (8) to retract into the hollow boss (7), the liquid delivery tube (12) is misaligned with the liquid inlet (10), and the movable block (8) blocks the output end of the liquid delivery tube (12).

3. The LED screen housing injection molding device according to claim 1, characterized in that: The bottom end of the movable block (8) is provided with an oil lowering channel (13), and the oil lowering channel (13) is communicated with the cavity (11). The bottom end of the hollow boss (7) is provided with a recovery groove (14), and the recovery groove (14) is communicated with the through hole (6) through the oil outlet hole (15). When the output end of the liquid delivery tube (12) is communicated with the cavity (11) through the liquid inlet (10), the recovery groove (14) is communicated with the cavity (11).

4. The LED screen housing injection molding device according to claim 3, characterized in that: The recovery groove (14) is always connected to the cavity (11), and an extrusion component is provided in the hollow boss (7). When the second driving source drives the moving block (8) to retract into the hollow boss (7), the extrusion component will squeeze the oil-coated cotton (9) to squeeze out the lubricating oil in the oil-coated cotton (9).

5. The LED screen housing injection molding device according to claim 4, characterized in that: The extrusion assembly includes an oil squeezing plate (18), a T-shaped rod (19), a spring (20) and an electric telescopic rod (21). The oil squeezing plate (18) is slidably installed in the moving block (8) and is in contact with the outer arc surface of the oil-coated cotton (9). One end of the T-shaped rod (19) passes through the moving block (8) and is fixedly connected to the oil squeezing plate (18), and the other end is connected to the moving block (8) through the spring (20). The pre-tightening force of the spring (20) pushes the T-shaped rod (19) away from the moving block (8). The electric telescopic rod (21) is fixedly installed in the hollow boss (7). When the movable end of the electric telescopic rod (21) extends, it pushes the T-shaped rod (19) close to the moving block (8).

6. The LED screen housing injection molding device according to claim 5, characterized in that: The extrusion assembly further comprises a receiving groove (16) and a baffle (17), wherein the receiving groove (16) is provided in the hollow boss (7), and the baffle (17) is slidably mounted in the receiving groove (16), and is driven to rise and fall by a third driving source. When the baffle (17) is located in the receiving groove (16), it is located above the moving block (8); when the second driving source drives the moving block (8) to retract into the hollow boss (7), the baffle (17) descends, and its outer arc surface is in contact with the inner arc surface of the oil-coated cotton (9).

7. A process for injection molding a housing for an LED screen, characterized in that: The process is applied to an LED screen housing injection molding device as described in any one of claims 1 to 6, and the process includes the following steps: Step S1: The first driving source drives the movable mold (3) to descend, the guide rod (5) passes through the hollow boss (7) and the through hole (6) in sequence, and the hollow boss (7) enters the groove (24), and the mold closing of the movable mold (3) and the fixed mold (2) is completed at this time; Step S2: Pushing the molten plastic to fill the mold cavity between the movable mold (3) and the fixed mold (2) through the plunger-type feeding component (4), while the monitoring component monitors whether the guide rod (5) needs to be lubricated; Step S3: The monitoring component determines that the guide rod (5) does not need to be lubricated, and the movable mold (3) and the fixed mold (2) can be opened directly after the plastic is completely cooled, solidified and hardened, and the finished product can be taken out; Step S4: When the monitoring component determines that the guide rod (5) needs to be lubricated, the second driving source drives the two moving blocks (8) to move closer to each other while waiting for cooling, until the two oil-coating cottons (9) form a ring and wrap around the outer surface of the guide rod (5), and then the oil delivery component delivers the lubricating oil to the cavity (11), and the oil-coating cottons (9) absorb the lubricating oil; Step S5: When the mold is opened, the guide rod (5) will rise, and the oiling cotton (9) will apply lubricating oil directly to the guide rod (5).

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