Injection molding device for automobile ornament

Abstract

The invention provides an injection molding device for automobile ornaments, and relates to the technical field of injection molding. An automobile ornament injection molding device comprises a workbench, two auxiliary lifting mechanisms, an injection molding assembly, an overflow mechanism and a sealing mechanism, the injection molding assembly presses a connecting nozzle, an injection molding nozzle and a flow guide nozzle are compressed and communicated, at the moment, injection molding work can be conducted, and the lifting mechanisms enable the injection molding assembly to ascend by a certain stroke; sealing is formed between the injection molding nozzle and the flow guide nozzle, at the moment, excessive pressure in the injection molding assembly enables injection molding raw materials to be extruded into the sealing cylinder, hydraulic oil in the sealing cylinder is extruded and conveyed to the backflow cylinder, the sliding piece moves upwards, the injection molding assembly continues to move upwards, the sliding piece abuts against the top plate, and the hydraulic oil in the backflow cylinder is extruded into the sealing cylinder; the injection molding raw materials which are temporarily stored are squeezed back to the injection molding nozzle, the overflowed injection molding raw materials are temporarily stored through the sealing cylinder arranged on the injection molding nozzle in a sleeving mode, and the waste heat in the injection molding nozzle can keep certain heat for the overflowed injection molding raw materials, keep circulation and play a role in pressure relief.

Description

Technical Field

[0001] The present application relates to the technical field of injection molding, and in particular to an injection molding device for automobile accessories. Background Art

[0002] When producing automobile decorative parts, one of the steps is to injection mold the automobile decorative parts by an injection molding machine. For example, the patent with patent publication number CN118061430B discloses an automobile parts injection molding device, which includes a frame, the frame is fixedly connected to a cylinder symmetrically arranged along the transverse direction of the frame, an injection molding component is slidably connected to a side of the frame close to the cylinder, an upper mold is connected between the telescopic ends of the cylinder symmetrically arranged along the transverse direction of the frame, a lower mold is fixedly connected to a side of the frame close to the upper mold, and a material guide pipe is connected between the injection molding component and the upper mold.

[0003] When the above-mentioned injection molding device is used for injection molding, the injection molding component injects the plastic raw material into the material guide tube, and then enters the mold for molding. After the mold is filled, the unreleased pressure in the injection molding component continues to squeeze the plastic raw material into the material guide tube, and then breaks through the sliding plug into the storage barrel for temporary storage.

[0004] However, in this scheme, it is necessary to release the excess pressure of the injection molding component by squeezing out the plastic raw material and storing it in a storage barrel to avoid the problem of resource loss caused by the pressure relief valve and high temperature affecting the service life. After the injection molding is completed, the temporarily stored plastic raw material is squeezed back into the injection molding component for reuse. First, in this scheme, the storage barrel and the injection molding component are two independent entities. Although they are interconnected, in the process of temporarily storing the plastic raw material, it is necessary to heat the plastic raw material in the storage barrel to ensure the fluidity of the plastic raw material, thereby increasing energy loss; secondly, the connecting piece between the storage barrel and the injection molding component cannot completely empty the plastic raw material inside, which will cause plastic raw material to remain between the storage barrel and the injection molding component, and there is no heat source here. Once the plastic raw material cools and solidifies, it will cause a complete blockage between the two, making the automotive parts injection molding device unable to be used again. Summary of the invention

[0005] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes an injection molding device for automobile accessories, comprising: a workbench, two auxiliary lifting mechanisms, an injection molding component, an overflow mechanism and a sealing mechanism, the workbench comprising a main frame and a sub-frame, the main frame is provided with a main lifting mechanism, the sub-frame is provided with a passive lifting platform, the passive lifting platform and the main lifting mechanism are synchronously lifted and lowered, and a molding component is provided on the passive lifting platform; the two auxiliary lifting mechanisms are symmetrically fixed to the passive lifting platform, and a top plate is fixed between the top ends of the two; the injection molding component is provided between the two auxiliary lifting mechanisms, and is driven by the two auxiliary lifting mechanisms to realize the lifting action; the bottom end of the injection molding component is connected with a guide nozzle, an injection molding nozzle and a connecting nozzle in sequence, the injection molding nozzle is elastically connected between the guide nozzle and the connecting nozzle, and the connecting nozzle is connected to the molding component; the bottom of the side wall of the guide nozzle is provided with a hole for the injection molding raw material to flow; the injection molding nozzle is plugged into the bottom wall of the guide nozzle. At one end of the guide nozzle, a hole is arranged on its side wall for the injection molding raw material to flow, and a blocking end is arranged at its end which is adapted to the inner wall of the guide nozzle; the overflow mechanism comprises a sealing cylinder coaxially sleeved on the outer side of the guide nozzle, and a reflux assembly fixedly connected to the two displacement ends of the auxiliary lifting mechanism; the sealing cylinder is sealed and connected to the guide nozzle, and covers the hole on the side wall of the guide nozzle; the reflux assembly comprises a reflux cylinder connected to the sealing cylinder, a sliding part is slidably inserted in the reflux cylinder, and the top end of the sliding part passes through the reflux cylinder and is extruded and matched with the top plate; the sealing mechanism comprises a first sealing part which is sealingly slidable between the sealing cylinder and the guide nozzle, and a second sealing part which is sealingly slidable in the reflux cylinder and fixedly connected to the sliding part, and hydraulic oil is filled between the first seal and the second seal; a spacing is left between the first seal and the hole on the side wall of the guide nozzle.

[0006] Preferably, the main lifting mechanism comprises: a driving member and a lifting plate, wherein the driving member is fixedly connected to the main frame; the lifting plate is slidably matched with the main frame and is fixedly connected to the telescopic end of the driving member.

[0007] Preferably, an active lifting platform is fixedly connected to the lifting plate, the active lifting platform and the main frame are slidably matched, and two connecting plates are symmetrically fixedly connected between the active lifting platform and the passive lifting platform.

[0008] Preferably, the molding assembly comprises: an upper mold group and a lower mold group, the upper mold group is fixedly connected to the passive lifting platform; the lower mold group is fixedly connected to the auxiliary frame and is compatible with the upper mold group.

[0009] Preferably, the auxiliary lifting mechanism includes: a vertical frame, a screw rod, a motor, a clamping block and a fixing plate. The vertical frame is fixedly connected to the passive lifting table and is arranged in a U shape; the screw rod is rotatably connected to the vertical frame, and one end thereof rotatably penetrates through the vertical frame; the motor is fixedly connected to the vertical frame, and its output shaft is key-connected to the screw rod; the clamping block is slidably arranged in the vertical frame, is in threaded cooperation with the screw rod, and is fixedly connected to the side wall of the injection molding assembly; the fixing plate is fixedly connected to the two clamping blocks and is fixedly sleeved on the reflux cylinder.

[0010] Preferably, the holes on the side wall of the flow guide nozzle are overflow holes, and the overflow holes are evenly arranged in the circumferential direction.

[0011] Preferably, the holes on the side wall of the injection nozzle are through holes, and the through holes are evenly arranged in the circumferential direction; the sealing end at its end is a sealing cover, the outer diameter of the sealing cover is larger than the outer diameter of the injection nozzle, and the side wall of the sealing cover fits with the inner wall of the flow guide nozzle.

[0012] Preferably, a fixing ring and a sliding ring are respectively sleeved on the side wall of the end of the injection nozzle extending out of the flow guide nozzle. The fixing ring is fixedly connected to the injection nozzle, the sliding ring is slidably sleeved on the injection nozzle and is in extrusion fit with the flow guide nozzle, and a first elastic member is fixedly connected between the two.

[0013] Preferably, the sliding member slidably inserted into the reflux cylinder is a sliding rod, and the sliding rod is coaxially and fixedly connected to the second sealing member.

[0014] Preferably, there is a gap between the place where the reflux cylinder is penetrated by the sliding rod and the side wall of the sliding rod.

[0015] Preferably, the first sealing member is annularly arranged, and double-layer sealing rings are sleeved inside it for sealing and sliding cooperation with the outer wall of the flow guide nozzle, and double-layer sealing rings are also sleeved outside it for sealing and sliding cooperation with the inner wall of the sealing cylinder, and the inner and outer groups of double-layer sealing rings on it correspond one by one; a hole for hydraulic oil to enter is arranged on the upper end surface of the first sealing member, and the hole communicates with the inner walls of the two sealing rings located in the upper layer of the inner and outer double-layer sealing rings; double-layer sealing rings are sleeved on the side wall of the second sealing member, and a blind hole is coaxially arranged on the lower end surface of the second sealing member, and the blind hole communicates with the inner walls of the double-layer sealing rings.

[0016] Preferably, upper and lower bidirectional grooves are respectively arranged on the side wall of the first sealing member at the same height inside and outside. The double-layer sealing rings on the first sealing member are respectively an upper bidirectional sealing ring and a lower bidirectional sealing ring. The upper bidirectional sealing rings are respectively embedded in the upper bidirectional grooves, and the lower bidirectional sealing rings are respectively embedded in the lower bidirectional grooves.

[0017] Preferably, the hole arranged on the upper end surface of the first sealing member is a pressurizing hole, and a plurality of the pressurizing holes are evenly arranged in the circumference, and the plurality of the pressurizing holes are respectively communicated with the upper bidirectional groove.

[0018] Preferably, a lower groove and an upper groove are sequentially arranged on the side wall of the second seal, and the double-layer sealing ring on the second seal is a lower sealing ring and an upper sealing ring, the lower sealing ring is embedded in the lower groove, and the upper sealing ring is embedded in the upper groove.

[0019] Preferably, lower through holes and upper through holes are sequentially arranged on the inner wall of the blind hole along the circumferential direction, and multiple lower through holes and upper through holes are evenly arranged in the circumferential direction, and multiple lower through holes are communicated with the lower side grooves, and multiple upper through holes are communicated with the upper side grooves.

[0020] Preferably, an emptying mechanism is provided between the inner bottom of the sealing cylinder and the first sealing member, and the emptying mechanism comprises: a slope ring and a lifting ring, the slope ring is fixedly sleeved on the guide nozzle, and is provided with a plurality of radial holes which are connected one by one with the holes on the side wall of the guide nozzle; the lifting ring is elastically inserted into the first sealing member and is extruded and fitted with the slope ring.

[0021] Preferably, the outer side wall of the slope ring is provided with a first slope; the bottom of the lifting ring is provided with a second slope, and the second slope matches the first slope.

[0022] Preferably, a recessed portion is coaxially arranged on the lower end surface of the first sealing member, and the lifting ring seal is inserted into the recessed portion and elastically matched with the recessed portion.

[0023] Preferably, a plurality of guide rods are evenly inserted into the upper end surface of the lifting ring in the circumferential direction, the guide rods are fixed to the recessed portion, a second elastic member is sleeved on the guide rods, and the second elastic member abuts against the recessed portion and the lifting ring respectively.

[0024] The beneficial effects of the present invention are: The injection molding component is pressed toward the connecting nozzle by the lifting mechanism, so that the injection molding nozzle and the guide nozzle are compressed and connected. At this time, normal injection molding can be carried out. The injection molding component is raised by the lifting mechanism to a certain stroke, so that a seal is formed between the injection molding nozzle and the guide nozzle. At this time, the residual pressure in the injection molding component will cause the injection molding material to be squeezed into the sealing cylinder, and the hydraulic oil in the sealing cylinder is squeezed and transmitted to the return cylinder, and the sliding member therein is forced to move upward, and then the lifting mechanism continues to drive the injection molding component upward. During this process, the top of the sliding member abuts against the top plate. During the continuous upward movement of the injection molding component, the hydraulic oil in the return cylinder is squeezed into the sealing cylinder, and the injection molding material temporarily stored therein is forced to be squeezed back into the injection molding nozzle. Since the injection molding nozzle and the guide nozzle are closed at this time, the injection molding material squeezed back can only be returned to the injection molding component; The overflowed injection molding material is temporarily stored by using a sealing tube sleeved on the outside of the injection molding nozzle, so that the residual heat in the injection molding nozzle can maintain a certain heat for the overflowed injection molding material, thereby maintaining its fluidity. While utilizing the residual heat in the injection molding nozzle, it can also play a role in pressure relief; by using the injection molding nozzle elastically connected between the guide nozzle and the connecting nozzle, the connection or closing relationship between the injection molding component and the molding component can be directly realized by utilizing the lifting action of the injection molding component, and the structure is simple and practical.

[0025] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the implementation methods of the present application, the drawings required for use in the implementation methods will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 is a schematic diagram of the overall structure of an automobile trim injection molding device according to an embodiment of the present application; Figure 2 is a structural exploded diagram of a workbench according to an embodiment of the present application; Figure 3 is a partial structural schematic diagram of an automobile trim injection molding device according to an embodiment of the present application; Figure 4 According to the embodiment of the present application Figure 3 A is an enlarged schematic diagram; Figure 5 is an exploded diagram of the auxiliary lifting mechanism and its surrounding structures according to an embodiment of the present application; Figure 6 is a schematic structural diagram of the bottom end of an injection molding component according to an embodiment of the present application; Figure 7 is a cross-sectional view of an overflow mechanism according to an embodiment of the present application; Figure 8 According to the embodiment of the present application Figure 7 A magnified schematic diagram of B; Fig. 9 is a schematic structural diagram of a first sealing member according to an embodiment of the present application; Fig.10 is an exploded view of a cross-sectional structure of a first sealing member according to an embodiment of the present application; Fig.11 is a schematic diagram of the bottom view structure of the second sealing member according to an embodiment of the present application; Fig.12 is an exploded view of the cross-sectional structure of the second sealing member according to an embodiment of the present application; Fig.13 is a schematic structural diagram of an emptying mechanism according to an embodiment of the present application; Fig.14 It is a partial structural exploded diagram of the emptying mechanism according to an embodiment of the present application.

[0028] Icons: 1. Workbench; 11. Main frame; 12. Main lifting mechanism; 121. Driving part; 122. Lifting plate; 13. Active lifting platform; 131. Connecting plate; 14. Sub-frame; 15. Passive lifting platform; 16. Molding component; 161. Upper mold group; 162. Lower mold group; 2. Auxiliary lifting mechanism; 21. Lifting component; 211. Stand; 212. Screw; 213. Motor; 214. Clamp; 215. Fixed plate; 22. Top plate; 3. Injection molding component; 31. Guide nozzle; 311. Overflow hole; 32. Injection molding nozzle; 321. Through hole; 322. Sealing cover; 323. Fixed ring; 324. Sliding ring; 325. First elastic member; 33. Connecting nozzle; 4. Overflow Flow mechanism; 41, sealing cylinder; 42, reflux assembly; 421, reflux cylinder; 422, sliding rod; 5, sealing mechanism; 51, first sealing member; 511, upper two-way groove; 512, lower two-way groove; 513, boost hole; 514, upper two-way sealing ring; 515, lower two-way sealing ring; 516, recessed portion; 52, second sealing member; 521, lower side groove; 522, upper side groove; 523, lower sealing ring; 524, upper sealing ring; 525, blind hole; 526, lower through hole; 527, upper through hole; 6, emptying mechanism; 61, slope ring; 611, radial hole; 612, first inclined surface; 62, lifting ring; 621, second inclined surface; 622, guide rod; 623, second elastic member. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0030] In order to make the purpose, technical solutions and advantages of the implementation methods of this application clearer, the technical solutions in the implementation methods of this application will be clearly and completely described below in conjunction with the drawings in the implementation methods of this application. Obviously, the described implementation methods are part of the implementation methods of this application, not all of the implementation methods. Based on the implementation methods in this application, all other implementation methods obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0031] like Figure 1-Figure 14 As shown, an automobile trim injection molding device according to an embodiment of the present application includes a workbench 1, two auxiliary lifting mechanisms 2, an injection molding assembly 3, an overflow mechanism 4 and a sealing mechanism 5.

[0032] In a specific embodiment of the present application, the workbench 1 includes a main frame 11 and a sub-frame 14. The main frame 11 is provided with a main lifting mechanism 12, and the sub-frame 14 is provided with a passive lifting platform 15. The passive lifting platform 15 and the main lifting mechanism 12 are lifted and lowered synchronously, and a molding component 16 is provided on the passive lifting platform 15; two auxiliary lifting mechanisms 2 are symmetrically fixed to the passive lifting platform 15, and a top plate 22 is fixed between the top ends of the two; the injection molding component 3 is arranged between the two auxiliary lifting mechanisms 2, and is driven by the two auxiliary lifting mechanisms 2 to realize lifting and lowering movements. It can be seen that the injection molding component 3 can follow the passive lifting platform 15 to perform lifting and lowering movements under the drive of the main lifting mechanism 12, and can also perform lifting and lowering movements on the passive lifting platform 15 under the drive of the auxiliary lifting mechanism 2.

[0033] It should be noted that the injection molding component 3 in the embodiment of the present application only serves to provide injection molding raw materials to the molding component 16, which is already very mature in the prior art, and its specific working principle and structural composition are not elaborated here.

[0034] The bottom end of the injection molding component 3 is connected to the guide nozzle 31, the injection nozzle 32 and the connecting nozzle 33 in sequence. The injection nozzle 32 is elastically connected between the guide nozzle 31 and the connecting nozzle 33, and the connecting nozzle 33 is connected to the molding component 16. It can be seen that the guide nozzle 31 and the connecting nozzle 33 can undergo elastic expansion and contraction changes through the injection molding nozzle 32.

[0035] Among them, the bottom of the side wall of the guide nozzle 31 is provided with holes for the flow of injection molding materials for subsequent pressure relief; the injection nozzle 32 is plugged into one end of the guide nozzle 31, and its side wall is provided with holes for the flow of injection molding materials to facilitate communication between the injection nozzle 32 and the guide nozzle 31, and its end is provided with a sealing end adapted to the inner wall of the guide nozzle 31 to seal the injection nozzle 32 and the guide nozzle 31.

[0036] Furthermore, the overflow mechanism 4 includes a sealing tube 41 coaxially sleeved on the outside of the guide nozzle 31, and a reflux assembly 42 fixedly connected to the displacement ends of the two auxiliary lifting mechanisms 2. It can be understood that the sealing tube 41 sleeved on the outside of the guide nozzle 31 can form a certain thermal insulation effect on the guide nozzle 31.

[0037] The sealing tube 41 is sealedly connected to the guide nozzle 31 and covers the holes on the side wall of the guide nozzle 31 . It can be understood that the sealing tube 41 and the inside of the guide nozzle 31 are connected through the holes on the side wall of the guide nozzle 31 .

[0038] The reflux assembly 42 includes a reflux cylinder 421 connected to the sealing cylinder 41, and a sliding part is slidably inserted in the reflux cylinder 421. The top end of the sliding part passes through the reflux cylinder 421 and is extruded and matched with the top plate 22. It should be noted that the extrusion action between the top end of the sliding part and the top plate 22 is achieved by lifting and lowering the injection molding assembly 3.

[0039] The sealing mechanism 5 includes a first sealing member 51 sealingly sliding between the sealing cylinder 41 and the guide nozzle 31, and a second sealing member 52 sealingly sliding in the reflux cylinder 421 and fixedly connected to the sliding member. Hydraulic oil is filled between the first sealing member 51 and the second sealing member 52. It can be understood that more precise kinetic energy transfer can be achieved between the sealing cylinder 41 and the reflux cylinder 421 through the hydraulic oil.

[0040] It should be noted that a distance is left between the first sealing member 51 and the hole on the side wall of the guide nozzle 31 , so that the injection molding material can smoothly enter the sealing tube 41 and interfere with the movement of the first sealing member 51 .

[0041] In addition, an automobile trim injection molding device according to an embodiment of the present application also has the following additional technical features: The main lifting mechanism 12 includes: a driving member 121 and a lifting plate 122 . The driving member 121 is fixedly connected to the main frame 11 . The lifting plate 122 is slidably matched with the main frame 11 and is fixedly connected to the telescopic end of the driving member 121 .

[0042] It should be noted that in the specific embodiment of the present application, the driving member 121 can be a hydraulic cylinder with telescopic function or other existing technologies, and its telescopic end can be directly fixed to the lifting plate 122, or it can be as shown in FIG. Figure 2 and Figure 3 As shown, the lifting plate 122 and the driving member 121 are connected in an articulated manner through a connecting rod structure, and the lifting and lowering changes of the lifting plate 122 on the main frame 11 are realized through the deformation of the connecting rod structure.

[0043] Further, an active lifting platform 13 is fixedly connected to the lifting plate 122. The active lifting platform 13 is slidably engaged with the main frame 11. Two connecting plates 131 are symmetrically and fixedly connected between the active lifting platform 13 and the passive lifting platform 15. It can be seen that the active lifting platform 13 and the passive lifting platform 15 are fixedly connected through the connecting plates 131, and synchronous and co-directional lifting actions are realized under the telescopic change of the telescopic end of the driving member 121.

[0044] Further, the molding assembly 16 includes: an upper mold set 161 and a lower mold set 162. The upper mold set 161 is fixedly connected to the passive lifting platform 15; the lower mold set 162 is fixedly connected to the auxiliary frame 14 and is adapted to the upper mold set 161. The upper mold set 161 and the lower mold set 162 are prior arts, and their specific selections are referenced by the actual decorative parts and will not be elaborated here.

[0045] Further, the auxiliary lifting mechanism 2 includes: a vertical frame 211, a screw 212, a motor 213, a clamping block 214, and a fixing plate 215. The vertical frame 211 is fixedly connected to the passive lifting platform 15 and is arranged in a U shape; the screw 212 is rotatably connected to the vertical frame 211, and one end thereof rotatably penetrates through the vertical frame 211; the motor 213 is fixedly connected to the vertical frame 211, and its output shaft is key-connected to the screw 212; the clamping block 214 is slidably arranged in the vertical frame 211, is in threaded cooperation with the screw 212, and is fixedly connected to the side wall of the injection molding assembly 3; the fixing plate 215 is fixedly connected to the two clamping blocks 214 and is fixedly sleeved on the return flow cylinder 421. It can be seen that the injection molding assembly 3 and the return flow cylinder 421 are arranged to lift synchronously, and both can drive the screw 212 to rotate on the vertical frame 211 through the motor 213 to drive the clamping block 214 to displace along the axial direction of the screw 212, thereby realizing the synchronous lifting of the injection molding assembly 3 and the return flow cylinder 421.

[0046] Further, the holes on the side wall of the flow guide nozzle 31 are overflow holes 311, and the overflow holes 311 are evenly arranged circumferentially.

[0047] The holes on the side wall of the injection nozzle 32 are through holes 321, and the through holes 321 are evenly arranged circumferentially; the sealing end at its end is a sealing cover 322, the outer diameter of the sealing cover 322 is larger than the outer diameter of the injection nozzle 32, and the side wall of the sealing cover 322 is in fit with the inner wall of the flow guide nozzle 31.

[0048] Further, a fixing ring 323 and a sliding ring 324 are respectively sleeved on the side wall of the end of the injection nozzle 32 extending out of the flow guide nozzle 31. The fixing ring 323 is fixedly connected to the injection nozzle 32, the sliding ring 324 is slidably sleeved on the injection nozzle 32 and is in extrusion fit with the flow guide nozzle 31, and a first elastic member 325 is fixedly connected between the two.

[0049] It can be seen from this that when the injection nozzle 32 is plugged into the connecting nozzle 33 and the injection molding component 3 continues to move downward, the injection nozzle 32 will be reversely plugged into the guide nozzle 31, so that the through hole 321 thereon enters from the outside of the guide nozzle 31 to the inside. In this way, the connection between the guide nozzle 31, the injection nozzle 32 and the connecting nozzle 33 is achieved, and the injection molding material can be normally transported to the inside of the molding component 16; when the injection molding component 3 is separated from the state of squeezing the first elastic member 325, that is, the injection molding component 3 moves upward relative to the passive lifting platform 15, at this time, under the elastic force of the first elastic member 325, the injection nozzle 32 will move to the outside of the guide nozzle 31, that is, the through hole 321 thereon moves from the inside of the guide nozzle 31 to the outside, until the sealing cover 322 and the inner wall of the guide nozzle 31 form a fit, thereby achieving the blockage between the guide nozzle 31 and the injection nozzle 32, and as the injection molding component 3 continues to move upward relative to the passive lifting platform 15, the injection nozzle 32 and the connecting nozzle 33 are separated.

[0050] Furthermore, the sliding member slidably inserted in the reflux tube 421 is a sliding rod 422 , and the sliding rod 422 and the second sealing member 52 are coaxially fixedly connected.

[0051] Furthermore, a gap is left between the part where the reflux tube 421 is penetrated by the slide rod 422 and the side wall of the slide rod 422 . It can be understood that the interior of the reflux tube 421 is located on one side of the upper end surface of the second seal 52 and will not cause pressure interference to the second seal 52 .

[0052] The following describes the use process of an automobile trim injection molding device according to an embodiment of the present application with reference to the accompanying drawings: When in use, the active lifting platform 13 and the passive lifting platform 15 are driven to descend synchronously through the driving member 121, so that the upper mold group 161 is pressed against the lower mold group 162, and then the driving member 121 is stopped, and the screw rod 212 is driven to rotate by the motor 213, so that the injection molding component 3 fixed by the clamping block 214 moves downward until the guide nozzle 31, the injection nozzle 32 and the connecting nozzle 33 at the lower end of the injection molding component 3 are connected, and the motor 213 is stopped, and the injection molding material is injected into the upper mold group 161 and the lower mold group 162 through the injection molding component 3, and the normal injection molding operation is carried out. After the injection molding space in the upper mold group 161 and the lower mold group 162 is filled with the injection molding material, under the action of the residual pressure of the injection molding component 3, the injection molding component 3 is pressed against the upper mold group 161 and the lower mold group 162. The injection molding material will flow from the overflow hole 311 into the sealing cylinder 41, and as the injection molding material gradually enters, an upward pressure is generated on the first sealing member 51, which will eventually force the first sealing member 51 to move axially upward, and the displacement of the first sealing member 51 will cause the hydraulic oil between it and the second sealing member 52 to transfer kinetic energy to the second sealing member 52, and then the second sealing member 52 will move axially upward in the reflux cylinder 421 through the hydraulic oil. At this time, the sliding rod 422 fixed to the second sealing member 52 will move upward synchronously until the pressure in the injection molding component 3 is balanced with the outside world. In this process, due to the heat inside the injection molding component 3 and the sealing cylinder 41 being sleeved on the guide nozzle 31, so the injection molding material temporarily stored in the sealing cylinder 41 can use the residual heat inside the injection molding component 3 to ensure its own fluidity. After the injection molding is completed, the motor 213 rotates in the opposite direction to drive the injection molding component 3 to move upward. During this process, the originally compressed first elastic member 325 will gradually return to its original state, and while the first elastic member 325 is reset, the injection molding nozzle 32 will be driven to move below the guide nozzle 31, and the sealing cover 322 will be used to close the guide nozzle 31. As the injection molding component 3 continues to rise, the injection molding nozzle 32 will be separated from the connecting nozzle 33. At the same time, the top of the sliding rod 422 will gradually approach the top plate 22 and finally form abutment. Then, as the reflux cylinder 421 rises, the sliding rod 422 will drive the first The second seal 52 is displaced axially downward relative to the reflux cylinder 421, squeezing the hydraulic oil therein, and then the first seal 51 is squeezed axially downward through the transfer of the hydraulic oil. As the first seal 51 is displaced axially downward, the injection molding material originally temporarily stored in the sealing cylinder 41 will be squeezed back to the inside of the guide nozzle 31 through the overflow hole 311. Because a seal is formed between the guide nozzle 31 and the injection nozzle 32 at this time, the squeezed injection molding material can and can only be returned to the injection molding component 3 for the next injection molding. After the decorative mold is formed, the driving member 121 drives the upper mold group 161 to separate from the lower mold group 162, and the molding mold is taken out to complete the decorative mold injection molding work.It can be understood that, through the design of the overflow mechanism 4, the injection molding raw material is temporarily stored on the side of the guide nozzle 31, and the heat in the injection molding component 3 can be used to ensure the fluidity of the temporarily stored injection molding raw material, while making full use of the residual heat, avoiding the injection molding raw material from solidifying and causing blockage. At the same time, it avoids the waste caused by the residual pressure of the injection molding raw material in the injection molding component 3 directly overflowing into the external environment.

[0053] In the related art, in the automotive accessories injection molding device, the first seal 51 and the second seal 52 therein will undergo frequent reciprocating circumferential displacements during long-term use. Once there is a problem with the sealing performance of the first seal 51 or the second seal 52, the overflowed injection molding material will not be able to flow back into the injection molding component 3 normally, and even the hydraulic oil will enter the injection molding component 3, causing the automotive accessories injection molding to fail to be completed normally.

[0054] According to some embodiments of the present application, the first seal 51 is arranged in an annular shape, and its inner sleeve that is sealed and slidably matched with the outer wall of the guide nozzle 31 is provided with a double-layer sealing ring, and its outer side that is sealed and slidably matched with the inner wall of the sealing cylinder 41 is also sleeved with a double-layer sealing ring, and the two groups of inner and outer double sealing rings thereon correspond one to one; the upper end face of the first seal 51 is provided with a hole for the entry of hydraulic oil, and the hole is connected to the inner walls of the two sealing rings located on the upper layer of the inner and outer double-layer sealing rings; the side wall of the second seal 52 is sleeved with a double-layer sealing ring, and the lower end face of the second seal 52 is coaxially provided with a blind hole 525, and the blind hole 525 is connected to the inner wall of the double-layer sealing ring.

[0055] Specifically, an upper bidirectional groove 511 and a lower bidirectional groove 512 are respectively provided on the side walls of the first sealing member 51 at the same height inside and outside. The double-layer sealing rings on the first sealing member 51 are respectively an upper bidirectional sealing ring 514 and a lower bidirectional sealing ring 515. The upper bidirectional sealing ring 514 is respectively embedded in the upper bidirectional groove 511, and the lower bidirectional sealing ring 515 is respectively embedded in the lower bidirectional groove 512.

[0056] It should be noted that in the specific embodiment of the present application, the upper bidirectional groove 511, the lower bidirectional groove 512, the upper bidirectional sealing ring 514 and the lower bidirectional sealing ring 515 are respectively inner and outer ones that are coaxial and of equal height. In this way, the sealing between the inner and outer sides of the first sealing member 51 and the connecting parts is achieved through the inner and outer sealing rings and the upper and lower double-layer settings.

[0057] Specifically, the hole disposed on the upper end surface of the first sealing member 51 is a pressurizing hole 513 , and a plurality of pressurizing holes 513 are evenly disposed in the circumferential direction, and the plurality of pressurizing holes 513 are respectively communicated with the upper bidirectional groove 511 .

[0058] It can be seen from this that when the hydraulic oil is squeezed, the hydraulic oil at the upper end of the first seal 51 will exert a radial force on the side wall of the upper bidirectional seal ring 514 under the action of pressure, forcing the outer upper seal ring and the inner wall of the sealing cylinder 41 to form a tighter seal, while forcing the inner upper seal ring and the outer wall of the guide nozzle 31 to form a better seal.

[0059] Furthermore, a lower groove 521 and an upper groove 522 are sequentially provided on the side wall of the second sealing member 52 . The double-layer sealing ring on the second sealing member 52 is a lower sealing ring 523 and an upper sealing ring 524 . The lower sealing ring 523 is embedded in the lower groove 521 , and the upper sealing ring 524 is embedded in the upper groove 522 .

[0060] Furthermore, the inner wall of the blind hole 525 is sequentially provided with lower through holes 526 and upper through holes 527 along the circumferential direction, and multiple lower through holes 526 and upper through holes 527 are evenly provided in the circumferential direction, and multiple lower through holes 526 are communicated with the lower side groove 521, and multiple upper through holes 527 are communicated with the upper side groove 522.

[0061] It can be understood that when the hydraulic oil is squeezed, the hydraulic oil applies a radial outward force to the inner walls of the lower sealing ring 523 and the upper sealing ring 524 through the blind hole 525 and the lower through hole 526 and the upper through hole 527 thereon, thereby forming a tighter seal between the outer walls of the lower sealing ring 523 and the upper sealing ring 524 and the inner wall of the reflux cylinder 421.

[0062] Therefore, during specific use, no matter which end the hydraulic oil is squeezed to, under the action of the squeezing force, a radial force is applied to the upper bidirectional sealing ring 514 on the first sealing member 51, so that a better seal is formed between the upper bidirectional sealing ring 514 and the sealing cylinder 41 and the guide nozzle 31. At the same time, a radial force is applied to the lower sealing ring 523 and the upper sealing ring 524 on the second sealing member 52, so that a tighter seal is formed between the lower sealing ring 523 and the upper sealing ring 524 and the reflux cylinder 421. The upper and lower double-layer sealing ring design of the first sealing member 51 and the upper and lower double-layer sealing ring design of the second sealing member 52 will enable the two to achieve better sealing performance at their respective positions, enhance their sealing capabilities, extend their service life, and ensure the use effect of the automotive trim injection molding device.

[0063] In the related art, in the automobile accessories injection molding device, the injection molding material is temporarily stored. When it flows back into the guide nozzle 31, it is located at the bottom of the sealing tube 41. Because there is a distance between the first sealing member 51 and the overflow hole 311, the injection molding material will form a certain residue here. The connection between this place and the injection molding component 3 is relatively weak, and the heat dissipation of the residual injection molding material therein is relatively serious. Once the residual injection molding material here forms condensation, the residual pressure in the injection molding component 3 cannot be released, and then the next time the injection molding material is injected into the molding component 16, it may form a spray due to pressure changes, causing defects in the accessories mold.

[0064] According to some embodiments of the present application, an emptying mechanism 6 is arranged between the inner bottom of the sealing cylinder 41 and the first sealing member 51, and the emptying mechanism 6 includes: a slope ring 61 and a lifting ring 62, the slope ring 61 is fixedly sleeved on the guide nozzle 31, and is provided with a plurality of radial holes 611 which are connected to the holes on the side wall of the guide nozzle 31 in a one-to-one correspondence; the lifting ring 62 is elastically inserted into the first sealing member 51, and is extruded and matched with the slope ring 61.

[0065] Specifically, the outer wall of the slope ring 61 is provided with a first slope 612; the bottom of the lifting ring 62 is provided with a second slope 621, and the second slope 621 and the first slope 612 fit together, that is, when the two fit together, a seamless connection state can be formed.

[0066] Specifically, a recessed portion 516 is coaxially disposed on the lower end surface of the first sealing member 51 , and the lifting ring 62 is sealingly inserted into the recessed portion 516 and elastically matched with the recessed portion 516 .

[0067] Furthermore, a plurality of guide rods 622 are evenly inserted into the upper end surface of the lifting ring 62 in the circumferential direction. The guide rods 622 are fixed to the recessed portion 516 . A second elastic member 623 is sleeved on the guide rods 622 . The second elastic member 623 abuts against the recessed portion 516 and the lifting ring 62 , respectively.

[0068] It should be noted that the elastic force of the second elastic member 623 is greater than the lateral pressure exerted by the injection molding material on the inner wall of the guide nozzle 31 in the non-overflow state.

[0069] Therefore, in actual use, when the injection molding material in the guide nozzle 31 does not overflow, the first inclined surface 612 and the second inclined surface 621 are in a tightly fitted state, that is, the second elastic member 623 is in a normally stretched state. Once the injection molding material overflows, the injection molding material will apply pressure to the second inclined surface 621 through the radial hole 611, and gradually force it to move upward, thereby squeezing the second elastic member 623, and the lifting ring 62 is inserted into the recessed portion 516. As the squeezing force increases (the overflow phenomenon continues to occur), the first sealing member 51 is subjected to the pressure transmitted from below, and will undergo an axial upward displacement. Conversely, when the first sealing member 51 is subjected to the pressure from the slide rod 422 above, When the extrusion pressure in the direction causes the injection molding material to flow back into the guide nozzle 31, the first sealing member 51 is displaced axially downward. During this process, as the overflow phenomenon stops, the second elastic member 623 will be reset under the action of its own elastic force, forcing the lifting ring 62 originally inserted in the recessed portion 516 to move downward until the first sealing member 51 moves to the bottom of the sealing cylinder 41. At this time, the second inclined surface 621 will fit the first inclined surface 612, so that there is almost no residual injection molding material in the sealing cylinder 41, and the only residual is also in the radial hole 611. Through the connection between the overflow hole 311 and the injection molding component 3, the heat of the residual injection molding material here can be effectively guaranteed, that is, its fluidity can be guaranteed, and the solidification phenomenon caused by severe heat dissipation can be avoided.

[0070] It should be noted that the specific models and specifications of the driving member 121, the upper mold group 161, the lower mold group 162, the screw 212, the motor 213, the first elastic member 325, the upper bidirectional sealing ring 514, the lower bidirectional sealing ring 515, the lower sealing ring 523, the upper sealing ring 524 and the second elastic member 623 need to be selected and determined according to the actual specifications of the device, and the specific selection and calculation method adopts the existing technology in the field, so it will not be described in detail.

[0071] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. An injection molding device for automobile accessories, characterized in that: include: A workbench (1), the workbench (1) comprising a main frame (11) and a sub-frame (14), the main frame (11) being provided with a main lifting mechanism (12), the sub-frame (14) being provided with a passive lifting platform (15), the passive lifting platform (15) and the main lifting mechanism (12) being lifted and lowered synchronously, and the passive lifting platform (15) being provided with a molding assembly (16); Two auxiliary lifting mechanisms (2), the two auxiliary lifting mechanisms (2) being symmetrically fixed to the passive lifting platform (15), and a top plate (22) being fixed between the top ends of the two auxiliary lifting mechanisms; An injection molding component (3), the injection molding component (3) being arranged between the two auxiliary lifting mechanisms (2) and driven by the two auxiliary lifting mechanisms (2) to achieve lifting action; The bottom end of the injection molding component (3) is connected in sequence to a guide nozzle (31), an injection nozzle (32) and a connecting nozzle (33); the injection nozzle (32) is elastically connected between the guide nozzle (31) and the connecting nozzle (33); and the connecting nozzle (33) is connected to the molding component (16); The bottom of the side wall of the flow guide nozzle (31) is provided with a hole for the injection molding raw material to flow; The injection nozzle (32) is plugged into one end of the guide nozzle (31), and a hole is provided on its side wall for the injection raw material to flow, and a blocking end is provided at its end to match the inner wall of the guide nozzle (31); An overflow mechanism (4), the overflow mechanism (4) comprising a sealing cylinder (41) coaxially sleeved on the outside of the guide nozzle (31), and a return assembly (42) fixedly connected to the displacement ends of the two auxiliary lifting mechanisms (2); The sealing cylinder (41) is sealedly connected to the flow guide nozzle (31) and covers the hole on the side wall of the flow guide nozzle (31); The reflux assembly (42) comprises a reflux cylinder (421) connected to the sealing cylinder (41), a sliding member is slidably inserted in the reflux cylinder (421), and the top end of the sliding member passes through the reflux cylinder (421) and is pressed and matched with the top plate (22); A sealing mechanism (5), the sealing mechanism (5) comprising a first sealing member (51) sealingly sliding between the sealing cylinder (41) and the guide nozzle (31), and a second sealing member (52) sealingly sliding in the return cylinder (421) and fixedly connected to the sliding member, wherein hydraulic oil is filled between the first sealing member (51) and the second sealing member (52); A distance is left between the first sealing member (51) and the hole on the side wall of the guide nozzle (31).

2. An automobile trim injection molding device as claimed in claim 1, characterized in that: The main lifting mechanism (12) comprises: A driving member (121), the driving member (121) being fixedly connected to the main frame (11); A lifting plate (122), the lifting plate (122) and the main frame (11) are slidably matched, and are fixedly connected to the telescopic end of the driving member (121).

3. An automobile trim injection molding device as claimed in claim 2, characterized in that: An active lifting platform (13) is fixedly connected to the lifting plate (122), the active lifting platform (13) and the main frame (11) are slidably matched, and two connecting plates (131) are symmetrically fixedly connected between the active lifting platform (13) and the passive lifting platform (15).

4. The automobile trim injection molding device according to claim 1, characterized in that: The forming assembly (16) includes: an upper die set (161) fixedly connected to the passive lifting table (15); a lower die set (162) fixedly connected to the auxiliary frame (14) and adapted to the upper die set (161).

5. The automobile trim injection molding device according to claim 1, characterized in that: The auxiliary lifting mechanism (2) includes: a vertical frame (211) fixedly connected to the passive lifting table (15) and arranged in a U-shape; a screw rod (212) rotatably connected to the vertical frame (211), with one end thereof rotatably penetrating through the vertical frame (211); a motor (213) fixedly connected to the vertical frame (211), and the output shaft thereof is key-connected to the screw rod (212); a clamping block (214) slidably arranged in the vertical frame (211), threadedly engaged with the screw rod (212), and fixedly connected to the side wall of the injection molding assembly (3); a fixing plate (215) fixedly connected to the two clamping blocks (214) and fixedly sleeved on the reflux cylinder (421).

6. The automobile trim injection molding device according to claim 1, characterized in that: The holes on the side wall of the flow guiding nozzle (31) are overflow holes (311), which are uniformly arranged circumferentially.

7. The automobile trim injection molding device according to claim 1, characterized in that: The holes on the side wall of the injection nozzle (32) are through holes (321), which are uniformly arranged circumferentially; the plugging end at its end is a sealing cover (322), the outer diameter of the sealing cover (322) is larger than the outer diameter of the injection nozzle (32), and the side wall of the sealing cover (322) is in fit with the inner wall of the flow guiding nozzle (31).

8. The automobile trim injection molding device according to claim 1, characterized in that: A fixing ring (323) and a sliding ring (324) are respectively sleeved on the side wall of the end of the injection nozzle (32) extending out of the flow guiding nozzle (31). The fixing ring (323) is fixedly connected to the injection nozzle (32), the sliding ring (324) is slidably sleeved on the injection nozzle (32) and is in extrusion fit with the flow guiding nozzle (31), and a first elastic member (325) is fixedly connected between the two.

9. The automobile trim injection molding device according to claim 1, characterized in that: The sliding member slidably inserted in the reflux cylinder (421) is a sliding rod (422), and the sliding rod (422) is coaxially fixedly connected to the second sealing member (52).

10. An automobile trim injection molding device as claimed in claim 9, characterized in that: A gap is left between the position where the reflux cylinder (421) is penetrated by the sliding rod (422) and the side wall of the sliding rod (422).

Images