Die capable of being spliced

Abstract

The mold comprises a workbench, a temperature control module, a mold closing assembly and a liquid injection assembly, multiple sets of fixing shafts are arranged on the upper surface of the workbench and distributed in a mirror symmetry mode along the center line of the width of the workbench, and first positioning plates are fixedly connected to the top ends of the fixing shafts on the two sides; the opposite faces of the two first positioning plates are jointly and fixedly connected with a lower die, and an upper die is spliced to the top end of the lower die. The seam allowance mechanism and the compensation mechanism are arranged, so that the mold closing strength of the split mold is effectively improved, and meanwhile, the thermal expansion difference between different molds in the injection molding process is dynamically compensated; by arranging the injection molding assembly, the height of the injection molding opening in the mold can be freely adjusted, the injection molding opening and the liquid level in the mold are dynamically balanced, and it is effectively guaranteed that injection molding liquid is evenly distributed in the mold.

Description

Technical Field

[0001] The present invention relates to the technical field of mold manufacturing, and particularly to a splicable mold. Background Technique

[0002] An injection mold is a key tool for the injection molding process, mainly used to inject molten plastic into the mold cavity and form plastic products with the required shape after cooling. Among them, a split-splicing injection mold is a type of mold that divides the mold into multiple independent modules for design and manufacturing, and is particularly suitable for injection products with complex shapes, large sizes, or difficult to process integrally. By decomposing the mold into multiple parts, processing them separately and then assembling them, the processing difficulty can be effectively reduced, the mold accuracy can be improved, and it is convenient for maintenance and replacement.

[0003] After retrieval, a Chinese patent with the publication number CN119017644B includes an injection mold structure for injection molding. One end of the injection mold structure is installed with an injection pipeline structure for conveying injection liquid. One end of multiple injection pipeline structures is installed with a multi-station injection pipe structure for conveying injection liquid. The injection pipeline structure includes a semi-circular injection pipe. One end of the semi-circular injection pipe is connected in a communicating manner with a first injection pipe section one. A support cylinder is installed through the semi-circular injection pipe and the first injection pipe section one. A sliding push rod is slidably connected in a piston shape in the inner cavity of the support cylinder. One end of the support cylinder is fixedly installed with a second injection pipe section two. The second injection pipe section two is arranged in the inner cavity of the first injection pipe section one. The support cylinder is communicated with the second injection pipe section two. This solution manually intervenes the liquid outlet structure by holding the operation arm, making the liquid outlet structure closer to the injection liquid surface, thereby reducing the generation of bubbles in the injection liquid.

[0004] However, during the injection molding process of the split mold, the quality of the injection result mainly depends on the clamping strength between mold one and mold two, rather than the height difference between the injection port and the liquid surface. When the injection liquid enters mold two, mold two expands due to heat. At this time, there is a temperature difference between mold one and mold two, resulting in different thermal expansion amounts and thus generating alignment deviations. As a result, the gas is compressed and heated at the splicing gap, and at this time, problems such as flash, air entrapment, or deformation of the splicing surface occur in the injection result. On the other hand, the fluidity of the injection liquid is generally poor, resulting in easy accumulation and uneven distribution inside the mold and causing stratification of the injection result along the temperature gradient. Summary of the Invention

[0005] The purpose of the present invention is to provide a splicable mold, which has the advantages of improving the clamping strength and dynamic injection molding, and solves the problems raised in the background technique.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a splicable mold, comprising a workbench, a temperature control module, a mold clamping assembly and a liquid injection assembly, wherein the upper surface of the workbench is provided with multiple groups of fixed shafts and the multiple groups of fixed shafts are mirror-symmetrically distributed along the center line of the width of the workbench, the top ends of the fixed shafts on both sides are fixedly connected with a positioning plate 1, the opposite surfaces of the two positioning plates 1 are commonly fixedly connected with a lower mold, and the top end of the lower mold is spliced ​​with an upper mold;

[0007] The mold clamping assembly includes a stopper mechanism for controlling the lifting and lowering of the upper mold and a compensation mechanism for balancing the thermal expansion difference between the molds, the stopper mechanism includes a plurality of control screw rods fixedly connected to the upper surface of the workbench, and the compensation mechanism includes a fixed plate fixedly connected to the upper surface of the workbench;

[0008] The injection assembly includes an injection mechanism for completing the injection molding operation and a limiting mechanism for maintaining the sealing of the injection molding process, wherein the injection mechanism includes an injection device fixedly connected to the upper surface of the workbench, and the limiting mechanism includes a sealing plate that is in abutting contact with the lower mold and the upper mold;

[0009] The temperature control module is signal-connected to the mold clamping assembly and the liquid injection assembly, and includes a heating rod 1 embedded in the upper mold away from the lower mold side, a heating rod 2 embedded in the lower mold away from the upper mold side, and a heating rod 3 embedded in the joint surface of the lower mold and the upper mold.

[0010] Preferably, the compensation mechanism further comprises a positioning shaft 1 which penetrates through and is fixedly connected to the middle section of the fixed plate, a positioning shaft 2 is penetrated through and rotatably connected to the top end of the fixed plate, gears are fixedly connected to both ends of the positioning shaft 2, positioning plates 2 are fixedly connected to the outer contours on both sides of the positioning shaft 2, a plurality of groups of compensation springs 1 are fixedly connected to the lower surface of the positioning plate 2, and the bottom ends of the compensation springs 1 are fixedly connected to the same stop 1;

[0011] The compensation mechanism also includes a plurality of groups of compensation springs 2 fixedly connected to the upper surface of the positioning plate 1, and the top ends of the compensation springs 2 are commonly fixedly connected to the same stop 2.

[0012] Preferably, the contact surface between the stopper 1 and the stopper 2 is designed with an inclined surface, and the inclined direction points to the joint surface of the lower mold and the upper mold.

[0013] Preferably, the stop mechanism also includes multiple groups of tension springs fixedly connected to the upper surface of the workbench and each tension spring is sleeved on the outer contour of the control screw at the corresponding position, the top ends of the multiple groups of tension springs on one side are commonly fixedly connected to the same stop groove 1, and the stop groove 1 is fixedly connected to the upper mold, the stop groove 1 is threadedly connected to the control screw, both sides of the lower mold are fixedly connected to the stop groove 2, one end of the stop groove 1 is fixedly connected to a rack, and the rack and the gear are meshingly connected.

[0014] Preferably, the opening size of the stop groove one is adapted to the stop groove one, and the opening size of the stop groove two is adapted to the stop groove two.

[0015] Preferably, the injection molding mechanism also includes a motor fixedly connected to the top of the injection molding device, the output end of the motor is fixedly connected to a driving shaft, one end of the driving shaft is fixedly connected to a rotating disk, a guide rail is fixedly connected to the center of the rotating disk away from the driving shaft, a slider is slidably connected to the inner contour of the guide rail, an adjusting screw is threaded on the slider and the adjusting screw passes through the guide rail and extends upward, a deflection disk is fixedly connected to the side of the slider away from the rotating disk, a limiting groove is provided on the outer periphery of the deflection disk away from the slider, a lifting rod is transmission-connected in the limiting groove of the deflection disk, and the bottom end of the lifting rod is fixedly connected to an injection molding tube.

[0016] Preferably, one end of the injection tube extends into the interior of the lower mold and the upper mold, and the other end of the injection tube extends into the interior of the injection molding device and is connected to the injection molding device.

[0017] Preferably, both upper and lower ends of the sealing plate are fixedly connected with fixed frames, the bottom end of the fixed frame is fixedly connected to the upper surface of the workbench, the interior of the fixed frame is slidably connected with a positioning rod, a compression spring located inside the fixed frame is provided between the positioning rod and the fixed frame, the positioning rod passes through and is slidably connected to the sealing plate, and the opposite surfaces of the positioning rod are in contact with the injection molding tube.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The present invention provides a stopper mechanism and a compensation mechanism to effectively improve the clamping strength of the split mold while dynamically compensating for the thermal expansion difference between different molds during the injection molding process, thereby greatly eliminating the alignment deviation between different molds to improve the injection molding effect.

[0020] 2. The present invention provides a temperature control module to monitor the temperature of different molds in real time during the injection molding process and reduce the temperature difference, thereby further reducing the thermal expansion difference between different molds to reduce the workload of the mold clamping assembly.

[0021] 3. The present invention can freely adjust the height of the injection port in the mold by setting the injection molding component, so that it is dynamically balanced with the liquid level in the mold, and effectively ensure the uniform distribution of the injection liquid in the mold, thereby eliminating the temperature gradient in the mold as much as possible to improve the injection molding quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the main structure of the present invention;

[0023] Figure 2 It is a cross-sectional view of the main structure of the present invention;

[0024] Figure 3 Structural schematic diagram of the workbench of the present invention;

[0025] Figure 4 Structural schematic diagram of the mold clamping assembly of the present invention;

[0026] Figure 5 Schematic diagram of the compensation mechanism of the present invention;

[0027] Figure 6 Schematic diagram of the spigot mechanism of the present invention;

[0028] Figure 7 Schematic diagram of the injection molding assembly of the present invention;

[0029] Figure 8 Schematic diagram of the control mechanism of the present invention;

[0030] Figure 9 Schematic diagram of the limit mechanism of the present invention.

[0031] In the figure: 1. Workbench; 11. Fixed shaft; 12. First positioning plate; 13. Lower mold; 14. Upper mold; 15. First heating rod; 16. Second heating rod; 17. Third heating rod; 2. Fixed plate; 21. First positioning shaft; 22. Second positioning shaft; 23. Gear; 24. Second positioning plate; 25. First compensation spring; 26. First spigot; 27. Second compensation spring; 28. Second spigot; 3. Control lead screw; 31. Pulling spring; 32. First spigot groove; 33. Second spigot groove; 34. Rack; 4. Injection molding device; 41. Motor; 42. Driving shaft; 43. Rotating disk; 44. Guide rail; 45. Adjusting lead screw; 46. Slide block; 47. Deflecting disk; 48. Lifting rod; 49. Injection molding pipe; 5. Sealing plate; 51. Fixed frame; 52. Compression spring; 53. Positioning rod. Specific embodiments

[0032] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0033] Embodiment 1:

[0034] Please refer to Figures 1 to 9, the present invention provides a technical solution: a spliceable mold includes a workbench 1, a temperature control module, a mold closing assembly, and an injection liquid assembly. On the upper surface of the workbench 1, multiple groups of fixed shafts 11 are provided, and the multiple groups of fixed shafts 11 are symmetrically distributed along the center line of the width of the workbench 1 in a mirror image manner. At the top ends of the fixed shafts 11 on both sides, positioning plates 12 are fixedly connected. On the opposite surfaces of the two positioning plates 12, a lower mold 13 is fixedly connected in common. An upper mold 14 is spliced on the top of the lower mold 13;

[0035] The mold closing assembly includes a rabbet mechanism for controlling the lifting of the upper mold 14 and a compensation mechanism for balancing the thermal expansion difference between the molds. The rabbet mechanism includes multiple groups of control lead screws 3 fixedly connected to the upper surface of the workbench 1. The compensation mechanism includes a fixing plate 2 fixedly connected to the upper surface of the workbench 1;

[0036] The injection liquid assembly includes an injection molding mechanism for completing the injection molding operation and a limiting mechanism for maintaining the tightness during the injection molding process. The injection molding mechanism includes an injection molding device 4 fixedly connected to the upper surface of the workbench 1. The limiting mechanism includes a sealing plate 5 that abuts against and contacts the lower mold 13 and the upper mold 14;

[0037] The temperature control module is signal-connected to the mold closing assembly and the injection liquid assembly. It includes a heating rod 15 embedded on the side of the upper mold 14 away from the lower mold 13, a heating rod 16 embedded on the side of the lower mold 13 away from the upper mold 14, and a heating rod 17 embedded on the splicing surface of the lower mold 13 and the upper mold 14.

[0038] In this solution, the lower mold 13 and the upper mold 14 jointly form a mold set. The fixed shafts 11 and the positioning plates 12 jointly realize the fixed support of the lower mold 13. At this time, the lower mold 13 serves as the fixed mold side, and the upper mold 14 serves as the moving mold side. The lifting height of the upper mold 14 is controlled by the rabbet mechanism to realize the operations of mold closing and demolding. The rabbet mechanism applies a downward pulling force to the upper mold 14 to make it closely fit with the lower mold 13 to improve the mold closing strength. At the same time, the rabbet mechanism further cooperates with the compensation mechanism to balance the alignment deviation between the lower mold 13 and the upper mold 14 during the injection molding process.

[0039] The injection molding mechanism further completes the injection molding operation inside the lower mold 13 and the upper mold 14. By controlling the height position and injection molding state of the injection port, it adapts to different-sized mold sets while effectively ensuring the uniform distribution of the injection liquid in the lower mold 13, so as to balance the temperature gradient of the injection liquid in the lower mold 13 and improve the injection molding quality.

[0040] The temperature control module monitors the temperature changes of the lower mold 13 and the upper mold 14 during the injection molding process, and further reduces the temperature difference between the lower mold 13 and the upper mold 14 and their joint surfaces through heating rod 1 15, heating rod 2 16 and heating rod 3 17, thereby reducing the thermal expansion difference between the lower mold 13 and the upper mold 14 to reduce the workload of the compensation mechanism, thereby ensuring the compensation balance effect of the solution.

[0041] Embodiment 2:

[0042] The compensation mechanism also includes a positioning shaft 1 21 that penetrates and is fixedly connected to the middle section of the fixed plate 2, a positioning shaft 2 2 is penetrated and rotatably connected to the top of the fixed plate 2, both ends of the positioning shaft 2 2 are fixedly connected to gears 23, and the outer contours of both sides of the positioning shaft 2 2 are fixedly connected to positioning plates 24, and multiple groups of compensation springs 1 25 are fixedly connected to the lower surface of the positioning plate 24, and the bottom ends of the compensation springs 1 25 are fixedly connected to the same stop 1 26;

[0043] The compensation mechanism also includes a plurality of groups of compensation springs 27 fixedly connected to the upper surface of the positioning plate 12 , and the top ends of the compensation springs 27 are fixedly connected to the same stop 28 .

[0044] The contact surface between the first stopper 26 and the second stopper 28 is designed as an inclined surface, and the inclined direction points to the joint surface of the lower mold 13 and the upper mold 14 .

[0045] The stop mechanism also includes multiple groups of tension springs 31 fixedly connected to the upper surface of the workbench 1, and each tension spring 31 is sleeved on the outer contour of the control screw 3 at the corresponding position. The top ends of the multiple groups of tension springs 31 on one side are commonly fixedly connected to the same stop groove 1 32, and the stop groove 1 32 is fixedly connected to the upper mold 14, the stop groove 1 32 is threadedly connected to the control screw 3, and both sides of the lower mold 13 are fixedly connected to the stop groove 2 33, one end of the stop groove 1 32 is fixedly connected to the rack 34, and the rack 34 is meshingly connected to the gear 23 for transmission.

[0046] The opening size of the stop groove 1 32 is adapted to the stop groove 1 26 , and the opening size of the stop groove 2 33 is adapted to the stop groove 28 .

[0047] First, as can be seen from Embodiment 1, the lower mold 13 is fixed as the stationary mold side, and the upper mold 14 is driven to descend by the rabbet mechanism to complete the mold closing operation. At this time, multiple control lead screws 3 are controlled to rotate synchronously. The first rabbet groove 32 drives the upper mold 14 to descend synchronously under the screwing action between it and the control lead screw 3. During this process, the stretching degree of the tension spring 31 decreases synchronously with the descent of the first rabbet groove 32. That is, during the mold closing process, the pulling force of the tension spring 31 on the first rabbet groove 32 and the upper mold 14 gradually decreases. The decrease in the pulling force causes the frictional resistance of the control lead screw 3 when rotating to decrease. At this time, the descending speed of the upper mold 14 gradually increases to facilitate adjusting the mold closing position of the upper mold 14.

[0048] When the upper mold 14 and the lower mold 13 are completely spliced, the mold closing operation ends. At this time, the control lead screw 3 stops rotating. The pulling force of the tension spring 31 on the first rabbet groove 32 and the upper mold 14 is the pressure of the upper mold 14 on the lower mold 13. The pressure of the upper mold 14 on the lower mold 13 is equivalent to the mold closing force of the mold set at this time. The greater the mold closing force, the higher the splicing strength of the mold set, and the smaller the probability of quality problems such as flash at the splicing during injection molding. However, the structural strength problem at the splicing of the lower mold 13 and the upper mold 14 in the state of high mold closing force needs to be considered to avoid the structural fracture at the splicing due to excessive mold closing force.

[0049] In one of the embodiments, an adjusting bolt is added to the first rabbet groove 32 to control the pulling force of the tension spring 31, and the mold closing strength between the upper mold 14 and the lower mold 13 is further controlled by finely adjusting the pulling force of the tension spring 31, while avoiding structural fracture while ensuring the mold closing strength.

[0050] Similarly, during the demolding process, the control lead screw 3 rotates in the reverse direction to drive the first rabbet groove 32 and the upper mold 14 to rise. During this process, the tension spring 31 is gradually stretched, resulting in a gradual increase in the rotational resistance of the control lead screw 3, and the rising speed of the upper mold 14 gradually decreases to achieve an accurate demolding process, avoiding slight deformation of the product due to too fast demolding speed.

[0051] On the other hand, during the mold closing process, the first rabbet groove 32 drives the rack 34 to descend synchronously. At this time, the descent of the rack 34 further drives the gear 23 and the second positioning shaft 22 to rotate. The rotation of the second positioning shaft 22 further causes the second positioning plate 24 to start to deflect around the second positioning shaft 22. At this time, the second positioning plate 24 deflects towards the upper mold 14 and finally makes abutting contact with the upper mold 14.

[0052] During this process, the first rabbet 26 gradually inserts into the first rabbet groove 32 and makes abutting contact with the second rabbet 28. Under the abutting state, the first compensation spring 25 and the second compensation spring 27 are slightly compressed to balance a part of the mold closing force, further reducing the risk of structural fracture due to excessive mold closing force.

[0053] During the injection molding process, due to the injection liquid contacting the inside of the lower mold 13 first under the action of gravity, that is, the lower mold 13 starts to heat up first, and the upper mold 14 starts to heat up with a delay through the heat transfer of the lower mold 13. It is not until the liquid level height of the injection liquid in the mold set contacts the upper mold 14 that the upper mold 14 starts to directly heat up. Therefore, during the injection molding process, the temperature rise range of the lower mold 13 is significantly greater than that of the upper mold 14, and at this time, a thermal expansion difference appears between the lower mold 13 and the upper mold 14.

[0054] The temperature difference between the lower mold 13 and the upper mold 14 is reduced through the temperature control module to eliminate the thermal expansion difference between the lower mold 13 and the upper mold 14. Before the injection molding starts, the upper mold 14, the lower mold 13, and their splicing parts are preheated through the heating rod one 15, the heating rod two 16, and the heating rod three 17. The temperature of the lower mold 13 and the splicing area is heated to be close to but slightly lower than the temperature of the injection liquid, and the temperature of the upper mold 14 is maintained at the normal temperature. The upper mold 14 starts to heat up with a delay through the heat transfer of the lower mold 13. At this time, the temperature difference between the injection liquid and the lower mold 13 < 30°C, that is, when the injection liquid contacts the lower mold 13 first, the temperature rise change range of the lower mold 13 is small, so as to avoid large alignment deviations between it and the upper mold 14 caused by its violent expansion.

[0055] At the same time, after the upper mold 14 is preheated and starts to heat up with a delay, the initial temperature difference between it and the lower mold 13 is significantly reduced, thereby greatly reducing the thermal expansion difference between the upper mold 14 and the lower mold 13 and reducing the risk of damage to the structure of the splicing area caused by the violent expansion of the lower mold 13.

[0056] Furthermore, after the optimization scheme of local heating and temperature difference control by the temperature control module, there is still a small thermal expansion difference between the lower mold 13 and the upper mold 14. This part of the thermal expansion difference is further balanced by the compensation mechanism. When the lower mold 13 is heated and its temperature rises, the second rabbet 28 starts to expand thermally synchronously through heat transfer. At this time, the expansion of the second rabbet 28 begins to squeeze the first rabbet 26 upward, resulting in an increase in the compression degree of the first compensation spring 25. The counter-resistance of the first compensation spring 25 to the second rabbet 28 increases synchronously. That is, a part of the thermal expansion energy of the lower mold 13 is converted into the elastic potential energy of the first compensation spring 25 and stored, and the thermal expansion amount of the lower mold 13 decreases synchronously. Similarly, a part of the thermal expansion energy of the upper mold 14 is converted into the elastic potential energy of the second compensation spring 27 and stored, and the thermal expansion amount of the upper mold 14 decreases synchronously. Moreover, when the thermal expansion amounts of the lower mold 13 and the upper mold 14 are different, there is also a thermal expansion difference between the first rabbet 26 and the second compensation spring 27. At this time, the compression amounts of the first compensation spring 25 and the second compensation spring 27 are different. The end with the larger compression amount has a tendency to release elastic potential energy until the compression amounts between the first compensation spring 25 and the second compensation spring 27 reach equilibrium. Furthermore, the balance of the thermal expansion difference between the lower mold 13 and the upper mold 14 is achieved through the first compensation spring 25 and the second compensation spring 27. At this time, the alignment deviation between the lower mold 13 and the upper mold 14 is minimized, so as to reduce the risk of flash, gas entrapment or deformation of the splicing surface in the injection molding result, thereby effectively improving the injection molding quality of the mold.

[0057] It should be noted that during the process of mutual extrusion and final balance between the first rabbet 26 and the second rabbet 28, since the contact surfaces of the first rabbet 26 and the second rabbet 28 adopt an inclined surface design and the inclination direction points to the splicing surface of the lower mold 13 and the upper mold 14, a horizontal force will be generated when they are mutually extruded. This force is used to maintain the structural shapes of 13 and 14 to further improve the clamping strength of the mold set.

[0058] Embodiment Three:

[0059] The injection molding mechanism further includes a motor 41 fixedly connected to the top end of the injection molding device 4. The output end of the motor 41 is fixedly connected to a drive shaft 42. One end of the drive shaft 42 is fixedly connected to a rotating disk 43. The center of the side of the rotating disk 43 away from the drive shaft 42 is fixedly connected to a guide rail 44. A slider 46 is slidably connected to the inner contour of the guide rail 44. The slider 46 is screwed with an adjusting screw rod 45 and the adjusting screw rod 45 penetrates through the guide rail 44 and extends upward. The side of the slider 46 away from the rotating disk 43 is fixedly connected to a deflection disk 47. A limiting groove is formed in the outer peripheral part of the side of the deflection disk 47 away from the slider 46. A lifting rod 48 is drivingly connected in the limiting groove of the deflection disk 47. The bottom end of the lifting rod 48 is fixedly connected to an injection molding pipe 49.

[0060] One end of the injection molding tube 49 extends into the interior of the lower mold 13 and the upper mold 14, and the other end of the injection molding tube 49 extends into the interior of the injection molding device 4 and is in communication with the injection molding device 4.

[0061] Both the upper and lower ends of the sealing plate 5 are fixedly connected with fixing frames 51. The fixing frame 51 at the bottom end is fixedly connected to the upper surface of the workbench 1. A positioning rod 53 is slidably connected inside the fixing frame 51. A compression spring 52 is arranged between the positioning rod 53 and the fixing frame 51 inside the fixing frame 51. The positioning rod 53 passes through and is slidably connected with the sealing plate 5. The opposite surfaces of the positioning rod 53 are in abutting contact with the injection molding tube 49.

[0062] As can be seen from Embodiment 1, during the injection molding process, due to the generally poor fluidity of the injection molding liquid, it will preferentially accumulate near the liquid injection port when injected into the mold, that is, the temperature on the side of the lower mold 13 close to the injection molding tube 49 rises earlier than the other side. At this time, there is a local temperature difference in the lower mold 13. And with the continuous injection of the injection molding liquid, the injection molding liquid that first enters the interior of the lower mold 13 is gradually pushed to the side of the lower mold 13 far from the injection molding tube 49. The temperature of this part of the injection molding liquid is lower than that of the newly injected injection molding liquid into the lower mold 13 due to the heat transfer process, resulting in a temperature gradient distribution of the injection molding liquid in the lower mold 13. Along the axis of the lower mold 13 from the injection molding tube 49 to the other side, the temperature of the injection molding liquid gradually decreases, and further leading to the risk that the injection molded product has a layering phenomenon due to the temperature gradient distribution.

[0063] Before the injection molding starts, control the adjusting screw rod 45 to rotate slowly. The rotation of the adjusting screw rod 45 causes the slider 46 to gradually extend downward from the inside of the guide rail 44 under the screwing action between it and the slider 46. During this process, the eccentric disc 47 and the lifting rod 48 synchronously descend, and the bottom end of the lifting rod 48 squeezes the injection molding tube 49 to descend synchronously. The height of the end of the injection molding tube 49 extending into the interior of the lower mold 13 and the upper mold 14 is the height of the liquid injection port. In the initial state, the height of the liquid injection port is parallel to the central height of the mold set composed of the lower mold 13 and the upper mold 14. Along with the gradual descent of the injection molding tube 49 during the adjustment, the height of the liquid injection port synchronously descends until the injection molding tube 49 contacts the inner wall of the lower mold 13. At this time, the height of the liquid injection port reaches the lowest, and when the injection molding liquid enters the interior of the mold set, it directly contacts the interior of the lower mold 13, thereby reducing the risk of bubbles being mixed inside due to the splashing of the injection molding liquid.

[0064] On the other hand, during the injection molding process, turn on the motor 41 and drive the rotating disc 43 and the guide rail 44 to start rotating synchronously through the drive shaft 42. At this time, the adjusting screw rod 45, the slider 46, and the eccentric disc 47 start rotating synchronously under the driving action of the guide rail 44. Since the slider 46 and the eccentric disc 47 gradually deviate from the center of the rotating disc 43 during the previous process of adjusting the height of the liquid injection port, that is, the adjusting screw rod 45, the slider 46, and the eccentric disc 47 are in an eccentric rotation process with the center of the rotating disc 43 as the axis at this time.

[0065] Further, along with the eccentric revolution of the eccentric turntable 47, the lifting rod 48 has a tendency to move synchronously under the driving action of the limit groove of the eccentric turntable 47. However, since the bottom end of the lifting rod 48 is fixedly connected to the injection molding pipe 49, and the injection molding pipe 49 is restricted by the limiting mechanism to only perform lifting motion, the lifting rod 48 can only perform lifting action synchronously. At this time, the eccentric revolution of the eccentric turntable 47 causes the lifting rod 48 to start reciprocating lifting motion, and the lifting amplitude corresponds to the deviation distance between the centers of the eccentric turntable 47 and the guide rail 44 during the previous adjustment of the injection port height. The amplitude of the lifting motion of the lifting rod 48 driving the injection molding pipe 49 is equal to twice the distance between the centers of the eccentric turntable 47 and the guide rail 44. That is, when the injection molding pipe 49 rises to the highest position, it just fits against the inner wall of the upper mold 14, thus avoiding the failure of injection due to excessive elevation of the injection molding pipe 49.

[0066] At the same time, the reciprocating lifting of the injection molding pipe 49 causes the height of the injection molding liquid to change dynamically when it enters the lower mold 13 and the upper mold 14. The higher the height of the injection port, the greater the injection degree of the injection molding liquid when it enters the lower mold 13 and the upper mold 14, thereby realizing the uniform distribution of the injection molding liquid on the inner wall of the lower mold 13, and destroying the temperature gradient in the mold set by eliminating the accumulation phenomenon of the injection molding liquid, so as to reduce the probability of stratification in the injection molding result.

[0067] On the other hand, during the reciprocating lifting of the injection molding pipe 49, the positioning rod 53 on the side of its extrusion motion moves synchronously. The extruded positioning rod 53 retracts into the fixed frame 51 and causes the corresponding compression spring 52 to be gradually compressed. The other positioning rod 53 always abuts against the injection molding pipe 49 under the gradual release of the compression spring 52, so as to continuously maintain the sealing effect between the lower mold 13 and the upper mold 14 during the injection molding process.

[0068] It should be noted that during the injection molding process of controlling the reciprocating lifting of the injection port height by the injection molding mechanism, in order to ensure the injection molding quality as much as possible, it is necessary to pre-evacuate the inside of the lower mold 13 and the upper mold 14 to eliminate the risk of air bubbles mixed in the injection molding liquid due to splashing. In the injection molding scenario where it is not necessary to control the reciprocating lifting of the injection port, only by controlling the adjustment screw rod 45 to adjust the height of the injection molding pipe 49 can the effect of keeping the injection port height parallel to the liquid level height be achieved.

[0069] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirits of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A splicable mold, characterized in that: The invention comprises a workbench (1), a temperature control module, a mold clamping assembly and a liquid injection assembly, wherein the upper surface of the workbench (1) is provided with a plurality of fixed shafts (11) and the plurality of fixed shafts (11) are distributed in a mirror-symmetrical manner along the center line of the width of the workbench (1), the top ends of the fixed shafts (11) on both sides are fixedly connected to a positioning plate (12), the opposite surfaces of the two positioning plates (12) are commonly fixedly connected to a lower mold (13), and the top end of the lower mold (13) is spliced ​​with an upper mold (14); The mold clamping assembly comprises a stopper mechanism for controlling the lifting and lowering of the upper mold (14) and a compensation mechanism for balancing the thermal expansion difference between the molds, the stopper mechanism comprises a plurality of control screw rods (3) fixedly connected to the upper surface of the workbench (1), and the compensation mechanism comprises a fixed plate (2) fixedly connected to the upper surface of the workbench (1); The liquid injection assembly comprises an injection mechanism for completing the injection molding operation and a limiting mechanism for maintaining the sealing of the injection molding process, wherein the injection mechanism comprises an injection molding device (4) fixedly connected to the upper surface of the workbench (1), and the limiting mechanism comprises a sealing plate (5) in abutting contact with the lower mold (13) and the upper mold (14); The temperature control module is signal-connected to the mold clamping assembly and the liquid injection assembly, and comprises a heating rod 1 (15) embedded in the upper mold (14) on the side away from the lower mold (13), a heating rod 2 (16) embedded in the lower mold (13) on the side away from the upper mold (14), and a heating rod 3 (17) embedded in the joint surface of the lower mold (13) and the upper mold (14).

2. A splicable mold according to claim 1, characterized in that: The compensation mechanism also includes a positioning shaft (21) that passes through and is fixedly connected to the middle section of the fixed plate (2); a positioning shaft (22) passes through and is rotatably connected to the top end of the fixed plate (2); gears (23) are fixedly connected to both ends of the positioning shaft (22); positioning plates (24) are fixedly connected to the outer contours of both sides of the positioning shaft (22); a plurality of groups of compensation springs (25) are fixedly connected to the lower surface of the positioning plate (24); and the bottom ends of the compensation springs (25) are fixedly connected to the same stop (26); The compensation mechanism also includes a plurality of groups of compensation springs (27) fixedly connected to the upper surface of the positioning plate (12), and the top ends of the compensation springs (27) are fixedly connected to the same stopper (28).

3. A splicable mold according to claim 2, characterized in that: The contact surface between the stopper 1 (26) and the stopper 2 (28) is designed as an inclined surface, and the inclination direction points to the joint surface of the lower mold (13) and the upper mold (14).

4. The splicable mold according to claim 1, characterized in that: The stop mechanism also includes a plurality of tension springs (31) fixedly connected to the upper surface of the workbench (1), and each tension spring (31) is sleeved on the outer contour of the corresponding position control screw (3), the top ends of the plurality of tension springs (31) on one side are fixedly connected to the same stop groove 1 (32), and the stop groove 1 (32) is fixedly connected to the upper mold (14), the stop groove 1 (32) is threadedly connected to the control screw (3), both sides of the lower mold (13) are fixedly connected to the stop groove 2 (33), one end of the stop groove 1 (32) is fixedly connected to a rack (34), and the rack (34) is meshingly connected to the gear (23).

5. A splicable mold according to claim 4, characterized in that: The opening size of the stop groove 1 (32) is compatible with the stop groove 1 (26), and the opening size of the stop groove 2 (33) is compatible with the stop groove 2 (28).

6. The splicable mold according to claim 1, characterized in that: The injection molding mechanism also includes a motor (41) fixedly connected to the top of the injection molding device (4); the output end of the motor (41) is fixedly connected to a driving shaft (42); one end of the driving shaft (42) is fixedly connected to a rotating disk (43); a guide rail (44) is fixedly connected to the center of the rotating disk (43) away from the driving shaft (42); a slider (46) is slidably connected to the inner contour of the guide rail (44); the slider (46) is threaded with an adjusting screw (45) and the adjusting screw (45) passes through the guide rail (44) and extends upward; a deflection disk (47) is fixedly connected to the side of the slider (46) away from the rotating disk (43); a limiting groove is provided on the outer periphery of the deflection disk (47) away from the slider (46); a lifting rod (48) is transmission-connected in the limiting groove of the deflection disk (47); and an injection molding tube (49) is fixedly connected to the bottom end of the lifting rod (48).

7. The splicable mold according to claim 6, characterized in that: One end of the injection tube (49) extends into the interior of the lower mold (13) and the upper mold (14), and the other end of the injection tube (49) extends into the interior of the injection molding device (4) and is connected to the injection molding device (4).

8. The splicable mold according to claim 1, characterized in that: The upper and lower ends of the sealing plate (5) are fixedly connected to a fixing frame (51), the bottom end of the fixing frame (51) is fixedly connected to the upper surface of the workbench (1), the interior of the fixing frame (51) is slidably connected to a positioning rod (53), a compression spring (52) located inside the fixing frame (51) is provided between the positioning rod (53) and the fixing frame (51), the positioning rod (53) passes through and is slidably connected to the sealing plate (5), and the opposite surfaces of the positioning rod (53) are in contact with the injection molding tube (49).

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