Shell injection molding device and process for LED screen

Abstract

The invention relates to the technical field of injection molding, and discloses a shell injection molding device and process for an LED screen. The device comprises a mold frame, a fixed mold is fixedly installed on the mold frame, a movable mold is installed on the mold frame in a sliding mode, and the movable mold is located above the fixed mold and driven by a first driving source to ascend and descend; any guide rod is monitored through the monitoring assembly when the movable mold and the fixed mold are closed, and when lubricating oil needs to be smeared on all the guide rods, the second driving sources in all the hollow bosses can drive the two moving blocks to get close to each other till the two pieces of oiling cotton form a ring to wrap the outer circle faces of the guide rods; and then the oil conveying assembly conveys the lubricating oil into the cavity, the oil coating cotton absorbs the lubricating oil, the guide rod ascends when the mold is opened, and the lubricating oil is directly coated on the guide rod by the oil coating cotton at the moment, so that the lubricating task can be completed under the condition that the production is not stopped, and the operation of coating the lubricating oil on all the guide rods is simultaneously carried out, so that the non-production time is greatly shortened.

Description

Technical Field

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

[0002] The LED screen shell injection molding device is an automated mechanical equipment designed specifically for the production of LED display screen outer frames. It mainly uses injection molding technology and can mass-produce high-precision, weather-resistant plastic parts in high efficiency.

[0003] When producing the shell in the existing injection molding device, the plastic particles are first heated to a molten state and injected into the mold cavity of the mold after the mold is closed. After the plastic is solidified, the mold is opened (i.e., the mold is separated), and then the shell can be taken out;

[0004] During the injection molding process, the precise fit between the guide rods and the through holes is crucial to ensure the accuracy of mold closing and parting. However, with high-frequency operation, these key parts are prone to wear, and timely replenishment of lubricating oil becomes a necessity. The currently commonly used manual application method is carried out in the state of mold separation, usually manually using a brush to apply lubricating oil to the guide rods one by one. On the one hand, manual operation is time-consuming. On the other hand, due to the mold structure, the guide rods located deep inside are often difficult to reach, resulting in incomplete coverage of manual lubrication. Based on this, the present invention purposely provides an LED screen shell injection molding device and process that can evenly apply lubricating oil to all guide rods during the production process. Summary of the invention

[0005] The purpose of the present invention is to provide an injection molding device and process for a shell of an LED screen in view of the deficiencies in the prior art, so as to solve the technical problems in the prior art.

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

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

[0008] A mold frame, on which a fixed mold is fixedly installed, and a movable mold is slidably installed, the movable mold is located above the fixed mold, is driven by a first driving source to be lifted and lowered, and is connected to a plunger-type feeding assembly, grooves are provided at the four corners of the bottom of the movable mold, a guide rod is fixedly installed in each groove, 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 correspond 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, and 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 arranged 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 coated with lubricating oil;

[0011] The two moving blocks are symmetrically arranged in the hollow boss, 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 smeared with lubricating oil, 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 cylindrical surface of the guide rod, and the oil delivery component transports the lubricating oil into the cavity, and the oil-coated cotton absorbs the lubricating oil and smears 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 it is connected with 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 with 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 with 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 is misaligned with the liquid inlet, 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 provided at the bottom of the movable block, and the lower oil channel is connected to the cavity. A recovery groove is provided at the bottom of the hollow boss, and the recovery groove is connected to the through hole through the oil outlet hole. 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 arranged 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 oil-coated cotton to squeeze out the lubricating oil in the oil-coated 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 oil-coated 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 spring preload force 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 cylindrical surface of the guide rod.

[0018] A shell injection molding process for an LED screen, the process is applied to the shell injection molding device for an LED screen as described above, and the process comprises 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, and the movable mold and the fixed mold are closed at this time;

[0020] Step S2: Push the molten plastic to fill the mold cavity between the movable mold and the fixed mold through the plunger-type feeding component, and at the same time, the monitoring component monitors whether the guide rod needs to be coated with lubricating oil;

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

[0022] Step S4: If the monitoring component determines that the guide rod needs to be coated with lubricating oil, the second driving source drives the two moving blocks to approach each other while waiting for cooling, until the two oil-coated cottons form a ring and wrap around the outer surface of the guide rod, and then the oil delivery component delivers the lubricating oil to the cavity, and the oil-coated cotton absorbs the lubricating oil;

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

[0024] Beneficial effects of the present invention:

[0025] 1. In the present invention, the monitoring component monitors any guide rod when the movable mold and the fixed mold are closed. When it is necessary to apply lubricating oil to all guide rods, the second driving source in all hollow bosses will drive the two moving blocks to approach each other until the two oil-coated cottons form a ring and wrap around the outer cylindrical surface of the guide rod. Then the oil delivery component delivers the lubricating oil to the cavity, and the oil-coated cotton absorbs the lubricating oil. When the mold is opened, the guide rod rises, and the oil-coated cotton directly applies the lubricating oil to the guide rod. In this way, the lubrication task can be completed without stopping the production, and the operation of applying lubricating oil to all guide rods can be performed at the same time, which greatly shortens the non-production time and improves 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 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 a role in lubricating the through hole;

[0027] 3. In the present invention, the lubricating oil in the oil-coated cotton is squeezed out by the extrusion assembly, and the squeezed lubricating oil flows out from the lower oil channel and finally enters the through hole to lubricate the through hole, thereby avoiding the waste of the 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 in conjunction with 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 a cross-section of a hollow boss in the present invention;

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

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

[0034] Figure 6 It is a structural schematic diagram of a longitudinal section of a moving 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 It is a schematic diagram of the structure of the contact between the moving block and the guide rod in the present invention;

[0037] Fig. 9 It is a schematic diagram of the structure of the oil-coated cotton contact guide rod in the present invention;

[0038] Fig.10 It is a schematic diagram of the structure of the oil squeezing plate squeezing the oil-coated cotton in the present invention;

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

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

[0041] In the figure: 1. mold frame; 2. fixed mold; 3. movable mold; 4. plunger-type feeding assembly; 5. guide rod; 6. through hole; 7. hollow boss; 8. moving block; 9. oil-coated cotton; 10. liquid inlet; 11. cavity; 12. liquid infusion tube; 13. oil lowering 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. annular block; 23. temperature monitoring assembly; 24. groove. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0043] See also Figure 1-Figure 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 installed, and a movable mold 3 is slidably installed, the movable mold 3 is located above the fixed mold 2, and is driven by a first driving source to be lifted and lowered, and is connected to a plunger-type feeding assembly 4, and grooves 24 are provided at the four corners of the bottom of the movable mold 3, and a guide rod 5 is fixedly installed in each groove 24, and each guide rod 5 has a corresponding through hole 6, and the through hole 6 is provided on the fixed mold 2, and is coaxially arranged with the guide rod 5;

[0045] Hollow boss 7, four hollow bosses 7 correspond to four guide rods 5 respectively, the hollow boss 7 is fixedly mounted on the fixed mold 2, it cooperates with the groove 24, and it is aligned with the through hole 6, when the movable mold 3 and the fixed mold 2 are molded, the guide rod 5 passes through the hollow boss 7 and the through hole 6 in sequence;

[0046] A monitoring component is arranged 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 coated with lubricating oil;

[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 an oil-coated cotton 9 is arranged in the cavity 11, and it is connected with the oil delivery component. When the monitoring component detects 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 oil-coated cottons 9 form a ring wrapped around the outer cylindrical surface of the guide rod 5. At this time, the oil delivery component transports the lubricating oil into the cavity 11, and the oil-coated cotton 9 will absorb the lubricating oil and smear 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 which time the movable mold 3 and the fixed mold 2 are molded together, and 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, and a shell for the LED screen is 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, that is, a shell injection molding process is completed;

[0050] Each mold closing and mold opening of the movable mold 3 and the fixed mold 2 requires the cooperation of the guide rod 5 and the through hole 6. Frequent work will lead to a reduction in the lubricating oil on the guide rod 5. If the lubricating oil is not added in time, it will affect the cooperation between the guide rod 5 and the through hole 6, thereby causing an adverse effect on the mold closing. Therefore, a monitoring component is added to determine whether the guide rod 5 needs to be coated with lubricating oil;

[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 contact the moving block 8 and the oiling cotton 9 when passing through the hollow boss 7. After each mold closing, a judgment is made through the monitoring component. 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 by the second driving source to approach each other until the two oil-coated cotton balls 9 form a ring-shaped wrap around the outer cylindrical 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 directly apply the lubricating oil 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 it is connected with 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 with the oil supply component, and 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 with 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 a connecting pipe, etc. The above components are prior art and the present invention does not improve them. Therefore, it is not necessary 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 figure, when the moving block 8 is in the default state, the liquid inlet 10 and the liquid infusion tube 12 are misaligned. 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. Fig. 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 out of the oiling cotton 9 into the oil lowering channel 13. Fig. 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 hole 15 in the recovery tank 14, and then Fig.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 arranged 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.

[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 inside 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 will flow out from the lower oil channel 13 and finally enter the through hole 6 to lubricate the through hole 6. At the same time, the waste of lubricating oil in the oil-coated cotton 9 is avoided, and the utilization rate of the lubricating oil is improved.

[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 preload 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 this embodiment, it should be noted that the electric telescopic rod 21 described in the present invention is a prior art, and the present invention does not improve it. Therefore, it is not necessary to disclose its specific mechanical structure and circuit structure, and it does not affect the integrity of the present invention.

[0061] In practical application, if Figure 5 It can be seen that the oil squeezing plate 18 is attached to the oiled 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 oiled cotton 9, so that the lubricating oil in the oiled cotton 9 can be squeezed out. The shape of the oil squeezing plate 18 also fits the shape of the oiled cotton 9, and can apply pressure to the oiled cotton 9 over a large area to ensure that the lubricating oil in the oiled cotton 9 is fully squeezed out. When the electric telescopic rod 21 contracts, the elastic force of the spring 20 will make the T-shaped rod 19 move away from the moving block 8. At this time, the oil squeezing plate 18 will not squeeze the oiled cotton 9.

[0062] like Figure 3-Figure 10 As shown, as a preferred embodiment of the present invention, the extrusion assembly also includes a receiving groove 16 and a baffle 17. The receiving groove 16 is opened in the hollow boss 7. The baffle 17 is slidably 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 descends, and its outer arc surface fits with the inner arc surface of the oiled cotton 9.

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

[0064] In practical application, if Figure 8 and Fig. 9 As shown in FIG. 1 , when the baffle 17 rises and completely enters the receiving groove 16, the movement of the moving block 8 will not be blocked at this time, and the moving block 8 can move to fit on the guide rod 5. When the moving block 8 is retracted back into the hollow boss 7, before the oil-spreading cotton 9 is squeezed by the oil squeezing plate 18, as shown in FIG. Fig.10 As shown, the baffle 17 is first driven down by the third driving source so that the outer arc surface of the baffle 17 fits with the inner arc surface of the oil-coated cotton 9. At this time, the baffle 17 can prevent the oil-coated cotton 9 from being squeezed by the oil squeezing plate 18 and pushed out of the original installation position.

[0065] like Fig.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 cylindrical 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 separation, 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. 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 separation, 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 lubricating oil needs to be added to the guide rod 5.

[0068] See also Figure 1-Figure 12 As shown, the present invention is a shell injection molding process for an LED screen, and the process is applied to a shell injection molding device for an LED screen 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, 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;

[0070] Step S2: Push 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, and at the same time, the monitoring component monitors whether the guide rod 5 needs to be coated with lubricating oil;

[0071] Step S3: The monitoring component determines that the guide rod 5 does not need to be coated with lubricating oil, 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;

[0072] Step S4: When the monitoring component determines that the guide rod 5 needs to be coated with lubricating oil, the second driving source drives the two moving blocks 8 to approach each other while waiting for cooling, until the two oil-coated cotton balls 9 form a ring shape 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-coated cotton balls 9 absorb the lubricating oil;

[0073] Step S5: When the mold is opened, the guide rod 5 will rise, and the oiling cotton 9 will directly apply lubricating oil to the guide rod 5.

[0074] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A housing injection molding device for an LED screen, characterized in that: include: 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) 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 material feeding assembly (4), the movable mold (3) having grooves (24) at four corners of the bottom, each groove (24) having a guide rod (5) fixedly mounted therein, each guide rod (5) having a corresponding through hole (6), the through hole (6) being arranged on the fixed mold (2) and being coaxially arranged with the guide rod (5); A hollow boss (7), wherein the four hollow bosses (7) correspond to the four guide rods (5) respectively, and the hollow boss (7) is fixedly mounted on the fixed mold (2), cooperates with the groove (24), and is aligned with the through hole (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; A monitoring component is arranged 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 coated with lubricating oil; The movable blocks (8) are symmetrically arranged in the hollow boss (7), the movable blocks (8) are slidably installed in the hollow boss (7), and the two movable blocks (8) are driven by two second driving sources to move toward each other. A cavity (11) is provided in the movable block (8), and an oil-coated cotton (9) is arranged in the cavity (11), and the cavity (11) is connected to the oil delivery component. When the monitoring component detects that the guide rod (5) needs to be smeared with lubricating oil, the second driving source drives the two movable blocks (8) to approach each other until the two oil-coated cottons (9) form a ring and wrap around the outer cylindrical surface of the guide rod (5). At this time, the oil delivery component transports the lubricating oil into the cavity (11), and the oil-coated 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.

2. The LED screen housing injection molding device according to claim 1, characterized in that: The oil delivery component comprises a liquid inlet (10) and a liquid delivery tube (12). The liquid inlet (10) is provided on the moving 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 is communicated with the oil supply component. The output end of the liquid delivery 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 delivery tube (12) is communicated with 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 delivery tube (12) is misaligned with the liquid inlet (10), and the moving block (8) blocks the output end of the liquid delivery tube (12).

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

4. The shell injection molding device for an LED screen according to claim 3, characterized in that: The recovery groove (14) is always connected to the cavity (11), and an extrusion component is arranged 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 shell injection molding device for LED screen according to claim 4, characterized in that: The extrusion assembly comprises 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 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 preload 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) is extended, 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); the receiving groove (16) is arranged in the hollow boss (7); the baffle (17) is slidably mounted in the receiving groove (16) and is driven by a third driving source to be raised and lowered; 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. The LED screen housing injection molding device according to claim 1, characterized in that: The monitoring component comprises an annular block (22) and a temperature monitoring component (23). The annular block (22) is fixedly mounted on the bottom of the fixed mold (2). A plurality of 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, the plurality of temperature monitoring components (23) monitor the temperature of the outer cylindrical surface of the guide rod (5).

8. A shell injection molding process for LED screens, characterized in that: The process is applied to a housing injection molding device for an LED screen as described in any one of claims 1 to 7, and the process comprises the following steps: 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), 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 coated with lubricating oil; Step S3: the monitoring component determines that the guide rod (5) does not need to be smeared with lubricating oil, 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 coated with lubricating oil, the second driving source drives the two moving blocks (8) to approach each other while waiting for cooling, until the two oil-coated cotton balls (9) form a ring shape 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-coated cotton balls (9) absorb the lubricating oil; Step S5: When the mold is opened, the guide rod (5) will rise, and at this time, the oiling cotton (9) will directly apply lubricating oil to the guide rod (5).

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