A smart pressure holding mechanism for injection molding machines

Abstract

The present invention relates to the technical field of injection molding machines, and specifically to an intelligent pressure-maintaining mechanism of an injection molding machine, including an injection mechanism, a driving mechanism and a clamping mechanism; the injection mechanism includes a mounting frame and a mounting seat, the mounting frame is provided with a guide rail and a first linear driver, the mounting seat is slidably arranged on the guide rail, the first linear driver is used to drive the mounting seat to reset, and the mounting seat is connected to the injection rod in the barrel; the driving mechanism includes a linear driving component, an elastic pushing component and a limiting component, the linear driving component pushes the mounting seat to move along the guide rail through the elastic pushing component, and the limiting component is used to limit the movement of the mounting seat; the clamping mechanism includes a head plate, a second plate, a tail plate and a clamping component for providing clamping force. The present invention realizes the function of stable pressure maintenance after high-speed injection through the injection mechanism, the driving mechanism and the clamping mechanism, and solves the problem that the existing injection molding machine has weak control over the pressure-maintaining operation and leads to insufficient clamping force.

Description

Technical Field

[0001] The invention relates to the technical field of injection molding machines, and in particular to an intelligent pressure-maintaining mechanism for an injection molding machine. Background Art

[0002] When using an injection molding machine for injection molding, after completing rapid injection, a pressure holding action is required. The injection action usually requires high response and high shooting speed, while the pressure holding action usually requires a long period of slow advancement. However, existing injection machines cannot ensure high-precision pressure holding action while completing high shooting speed and high response.

[0003] To this end, Chinese patent application CN118683008A discloses an independent injection and pressure-holding mechanism of an injection molding machine, an injection molding machine and a control method. The control method has a simple structure and is easy to control. It separates the injection action and the pressure-holding action to achieve independent injection and pressure-holding actions. It can simultaneously meet the requirements of rapid response in the injection process and high pressure and long-term pressurization in the pressure-holding process, and meet the needs of specific plastic products.

[0004] The clamping force refers to the locking force applied by the injection molding machine to the mold during injection in order to overcome the expansion force of the melt in the cavity on the mold. When the raw material is injected into the mold cavity at high pressure, a force that supports the mold will be generated. Therefore, the clamping unit of the injection molding machine must provide sufficient clamping force to ensure that the mold will not be stretched open during the injection process. However, when processing workpieces of different types, the holding pressure required is different. After adjusting the holding pressure, it is necessary to ensure that the clamping force of the mold is sufficient to avoid the increase of the supporting force caused by the holding pressure. The stability of the mold can still be maintained to ensure the smooth progress of the production process. The holding pressure mechanism on the existing injection molding machine cannot accurately obtain the holding pressure, which makes it impossible for the operator to adjust the clamping force according to the holding pressure. Once the adjustment range of the holding pressure is too large, the mold is easily stretched open. Summary of the invention

[0005] In view of the above problems, an intelligent pressure holding mechanism for an injection molding machine is provided, which solves the problem of insufficient clamping force caused by weak control of the pressure holding operation of the existing injection molding machine through an injection mechanism, a driving mechanism and a clamping mechanism.

[0006] In order to solve the problems of the prior art, the present invention provides an intelligent pressure-maintaining mechanism for an injection molding machine, comprising an injection mechanism, a driving mechanism and a locking mechanism; the injection mechanism comprises a mounting frame and a mounting seat, the mounting frame is provided with a guide rail and a first linear drive, the mounting seat is slidably arranged on the guide rail, the first linear drive is used to drive the mounting seat to reset, and the mounting seat is connected to the injection rod in the barrel; the driving mechanism comprises a linear driving component, an elastic pushing component and a limiting component, the linear driving component pushes the mounting seat to move along the guide rail through the elastic pushing component, and the limiting component is used to limit the movement of the mounting seat; the locking mechanism comprises a head plate, a second plate, a tail plate and a locking component for providing a locking force, a pull rod is provided on the tail plate, the head plate is connected to the pull rod, and the second plate is slidably matched with the pull rod; in a working state, when the thrust of the elastic pushing component on the mounting seat exceeds a threshold, the limiting component limits the movement of the mounting seat, the linear driving component stops driving, and the mounting seat is subjected to the elastic force of the elastic pushing component.

[0007] Preferably, the linear drive assembly includes a first rotary driver and a reciprocating screw; the first rotary driver is arranged on a mounting frame; a support seat and a guide rod are provided on the mounting frame; the reciprocating screw is rotatably arranged on the mounting frame, and the reciprocating screw is rotatably connected to the support seat; the limiting assembly includes a push block and a threaded sleeve; the push block is connected to the reciprocating screw through a thread and slides along the guide rod; the elastic pushing assembly is arranged on the push block; the threaded sleeve is rotatably arranged on the mounting seat, the threaded sleeve is threadedly connected to the reciprocating screw, and the thread direction of the threaded sleeve is opposite to the thread direction on the push block.

[0008] Preferably, the elastic pushing assembly includes a main rod, a first elastic member and a baffle; the main rod is arranged on the push block, and a secondary rod is slidably arranged on the main rod; the two ends of the first elastic member are respectively connected to the secondary rod and the push block; the baffle is movably arranged on the mounting seat, and the baffle is slidably matched with the guide rod; an adjustment assembly for controlling the movement of the baffle is provided on the mounting seat.

[0009] Preferably, a mounting ring is provided at one end of the push block close to the threaded sleeve, and a limit block and a second elastic member are provided on the mounting ring; the limit block is slidably installed on the mounting ring, and a docking groove cooperating with the limit block is provided on one side of the threaded sleeve close to the mounting ring; the two ends of the second elastic member are respectively connected to the limit block and the mounting ring.

[0010] Preferably, an oblique notch is provided on one side of the limit block; when the limit block is plugged into the docking groove, the mounting ring limits the rotation direction of the threaded sleeve through the interaction between the limit block and the docking groove.

[0011] Preferably, the adjustment assembly includes a second rotary drive, a screw, a pulley and a transmission belt; the second rotary drive is arranged on a mounting seat; the screw is rotatably arranged on the mounting seat, and the screw is threadedly connected to the baffle; two pulleys are provided, and the two pulleys are respectively sleeved on the driving end and the screw of the second rotary drive; the transmission belt connects the two pulleys.

[0012] Preferably, a first support and an abutment rod are provided on the head plate; the first support is connected to the head plate, and the abutment rod is arranged on the first support; a second support is provided on the second plate, an abutment block is provided at one end of the abutment rod close to the second support, and a pressure sensor is provided on the second support.

[0013] Preferably, an external thread is provided on the abutment rod, and the abutment rod is threadably connected to the first support; a rotating handle is provided at one end of the abutment rod away from the abutment block.

[0014] Preferably, a locking adjustment mechanism is provided on the tail plate, and the locking adjustment mechanism includes an adjusting nut and a synchronous drive assembly; at least two pull rods and adjusting nuts are provided, the pull rods are slidably matched with the tail plate, the adjusting nut is rotatably set on the tail plate, and the adjusting nut is threadedly connected to the pull rod; the synchronous drive assembly is used to drive multiple adjusting nuts to rotate synchronously.

[0015] Preferably, the synchronous drive assembly includes a third rotary driver, a first rotary gear, a gear ring and a second rotary gear; the third rotary driver is arranged on the tail plate; the first rotary gear is sleeved on the driving end of the third rotary driver; the gear ring is rotatably arranged on the tail plate, and the first rotary gear is meshingly connected to the gear ring; at least two second rotary gears are provided, and the second rotary gears are sleeved on the adjusting nut, and multiple second rotary gears are meshingly connected to the gear ring.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The present invention realizes the function of stable pressure holding after high-speed injection through the injection mechanism, the driving mechanism and the clamping mechanism, and the pressure holding intensity can be stably controlled through the setting of the elastic pushing component. When the thrust of the elastic pushing component on the mounting seat exceeds the threshold, the limiting component limits the movement of the mounting seat, the linear driving component stops driving, and the mounting seat is acted upon by the elastic force of the elastic pushing component, and the elastic force is transmitted to the injection rod in the barrel to perform the pressure holding operation. After the pressure holding is stably controlled, the clamping force provided by the clamping component is adjusted according to the pressure holding to realize the intelligent pressure holding operation.

[0018] 2. The present invention realizes the function of automatically limiting the movement of the mounting seat through the first rotary driver, the reciprocating screw, the push block and the threaded sleeve, and stops driving the movement of the mounting seat when the thrust exceeds the threshold, thereby performing a stable pressure-maintaining operation. After the mold cavity is filled with raw materials, the mounting seat is affected by resistance, and the elastic push component is further compressed. When the elastic force of the elastic push component increases to the threshold, the push block abuts against the threaded sleeve, and the rotation of the threaded sleeve is limited by the friction between the push block and the threaded sleeve. At this time, the mounting seat is subjected to the thrust of the elastic push component and has a tendency to approach the head plate. The movement of the mounting seat requires relative rotation between the threaded sleeve and the reciprocating screw. If the rotation of the threaded sleeve is restricted, the rotation of the reciprocating screw will drive the threaded sleeve to move in the direction close to the push block, and the push block has a tendency to move toward the threaded sleeve under the drive of the reciprocating screw, thereby simultaneously hindering the movement of the push block and the threaded sleeve, thereby limiting the movement of the mounting seat.

[0019] 3. The present invention realizes the function of providing stable thrust to the mounting seat through the main rod, the first elastic member, the baffle, the docking groove and the adjustment component. At the same time, the elastic force of the elastic pushing component when the push block and the threaded sleeve abut is adjusted by the adjustment component, thereby adjusting the pressure holding strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional schematic diagram of an intelligent pressure-holding mechanism of an injection molding machine.

[0021] Figure 2 The invention is a stereoscopic schematic diagram of an injection mechanism and a driving mechanism in an intelligent pressure-holding mechanism of an injection molding machine from a first-person perspective.

[0022] Figure 3 The invention is a stereoscopic schematic diagram of an injection mechanism and a driving mechanism in an intelligent pressure-holding mechanism of an injection molding machine from a second perspective.

[0023] Figure 4 The invention is a three-dimensional schematic diagram of a mold locking mechanism and a mold locking adjustment mechanism in an intelligent pressure holding mechanism of an injection molding machine.

[0024] Figure 5 The invention is a three-dimensional schematic diagram of a mounting seat and a driving mechanism in an intelligent pressure-holding mechanism of an injection molding machine.

[0025] Figure 6 It is a three-dimensional schematic diagram of a driving mechanism in an intelligent pressure-holding mechanism of an injection molding machine.

[0026] Figure 7 The invention is a three-dimensional exploded schematic diagram of a limiting component in an intelligent pressure holding mechanism of an injection molding machine.

[0027] Figure 8 The invention is a three-dimensional schematic diagram of a mounting seat, a baffle and an adjusting component in an intelligent pressure-holding mechanism of an injection molding machine.

[0028] Fig. 9 yes Figure 8 A local enlarged schematic diagram of point A in the middle.

[0029] Fig.10 The invention is a three-dimensional schematic diagram of a head plate and a second plate in an intelligent pressure-holding mechanism of an injection molding machine.

[0030] Fig.11 The invention is a three-dimensional schematic diagram of a head plate, a second plate, a tail plate and a clamping adjustment mechanism in an intelligent pressure-holding mechanism of an injection molding machine.

[0031] The numbers in the figure are: 1-injection mechanism; 11-mounting frame; 111-guide rail; 112-first linear drive; 1121-push rod; 113-support seat; 114-guide rod; 12-mounting seat; 2-driving mechanism; 21-linear driving assembly; 211-first rotary drive; 212-reciprocating screw rod; 22-elastic pushing assembly; 221-main rod; 2211-secondary rod; 222-first elastic member; 223-baffle; 23-limiting assembly; 231-push block; 232-threaded sleeve; 2321-docking groove; 233-mounting ring; 2331-limiting block; 2332-second elastic member; 24-adjusting assembly; 241-second rotary drive ;242-screw;243-pulley;244-transmission belt;3-locking mechanism;31-head plate;311-first support;312-abutment rod;3121-abutment block;313-rotating handle;32-second plate;321-second support;322-pressure sensor;33-tail plate;331-pull rod;34-locking assembly;341-second linear drive;342-push frame;343-first connecting rod;344-second connecting rod;345-connecting frame;4-locking adjustment mechanism;41-adjusting nut;42-synchronous drive assembly;421-third rotary drive;422-first rotary gear;423-toothed ring;424-second rotary gear. DETAILED DESCRIPTION

[0032] In order to further understand the features, technical means, specific objectives and functions of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0033] Reference Figure 1-Figure 4: An intelligent pressure-maintaining mechanism for an injection molding machine, comprising an injection mechanism 1, a driving mechanism 2 and a clamping mechanism 3; the injection mechanism 1 comprises a mounting frame 11 and a mounting seat 12, the mounting frame 11 is provided with a guide rail 111 and a first linear driver 112, the mounting seat 12 is slidably arranged on the guide rail 111, the first linear driver 112 is used to drive the mounting seat 12 to reset, and the mounting seat 12 is connected to the injection rod in the barrel; the driving mechanism 2 comprises a linear driving component 21, an elastic pushing component 22 and a limiting component 23, the linear driving component 21 pushes the mounting seat through the elastic pushing component 22 12 moves along the guide rail 111, and the limiting component 23 is used to limit the movement of the mounting seat 12; the locking mechanism 3 includes a head plate 31, a second plate 32, a tail plate 33 and a locking component 34 for providing a locking force, and a pull rod 331 is provided on the tail plate 33, the head plate 31 is connected to the pull rod 331, and the second plate 32 is slidably matched with the pull rod 331; in the working state, when the thrust of the elastic pushing component 22 on the mounting seat 12 exceeds the threshold, the limiting component 23 limits the movement of the mounting seat 12, the linear driving component 21 stops driving, and the mounting seat 12 is acted upon by the elastic force of the elastic pushing component 22.

[0034] The present invention realizes the function of stable pressure holding after high-speed injection through the injection mechanism 1, the driving mechanism 2 and the clamping mechanism 3, and the pressure holding intensity can be stably controlled by the setting of the elastic pushing component 22. When the thrust of the elastic pushing component 22 on the mounting seat 12 exceeds the threshold, the limiting component 23 limits the movement of the mounting seat 12, and then the linear driving component 21 stops driving. At this time, the mounting seat 12 is subjected to the elastic force of the elastic pushing component 22, and the elastic force is transmitted to the injection rod in the barrel to perform the pressure holding operation. After the pressure holding is stably controlled, the clamping force provided by the clamping component 34 is adjusted according to the pressure holding to realize the intelligent pressure holding operation. A push rod 1121 is provided on the driving end of the first linear driver 112, and the mold is arranged between the head plate 31 and the second plate 32. During the processing, plastic pellets are first loaded into the hopper of the injection molding machine. Then, the injection rod drives the barrel to melt in the heating area. After the pellets are melted, the elastic push component 22 is driven by the linear drive component 21. The elastic push component 22 pushes the mounting seat 12 and the injection rod to move, and the molten plastic is injected into the mold through the nozzle. During the injection process, the molten plastic is pushed by the check ring at the front of the injection rod. After the mold cavity is filled with raw materials, the mounting seat 12 is affected by resistance, and the elastic push component 22 is further compressed. When the elastic force of the elastic push component 22 increases to a threshold value, the limiting component 23 limits the movement of the mounting seat 12. The linear drive component 21 stops driving after sensing the increase in resistance. At this time, the elastic force of the elastic push component 22 continuously applies pressure to the mounting seat 12 to perform pressure-holding molding. During the pressure-holding process, as the raw materials cool and shrink, the elastic push component 22 will further push the mounting seat 12 to perform stable pressure-holding. After the processing is completed, the push rod 1121 is controlled to extend by the first linear drive 112. After the push rod 1121 contacts the mounting seat 12, it pushes the mounting seat 12 to reset.

[0035] Reference Figure 2 , Figure 3 and Figure 5 :The linear drive assembly 21 includes a first rotary driver 211 and a reciprocating screw 212; the first rotary driver 211 is arranged on the mounting frame 11; a support seat 113 and a guide rod 114 are provided on the mounting frame 11; the reciprocating screw 212 is rotatably arranged on the mounting frame 11, and the reciprocating screw 212 is rotatably connected to the support seat 113; the limiting assembly 23 includes a push block 231 and a threaded sleeve 232; the push block 231 is connected to the reciprocating screw 212 through a thread and slides along the guide rod 114; the elastic pushing assembly 22 is arranged on the push block 231; the threaded sleeve 232 is rotatably arranged on the mounting seat 12, the threaded sleeve 232 is threadedly connected to the reciprocating screw 212, and the thread direction of the threaded sleeve 232 is opposite to the thread direction on the push block 231.

[0036] The present invention realizes the function of automatically limiting the movement of the mounting seat 12 through the first rotary driver 211, the reciprocating screw 212, the push block 231 and the threaded sleeve 232. When the thrust exceeds the threshold, the movement of the mounting seat 12 is stopped, thereby performing a stable pressure-maintaining operation. A controller for human-machine interaction is provided on the mounting frame 11. The first rotary driver 211 is preferably a servo motor, and the servo motor is electrically connected to the controller. During the processing, the operator sends a signal to the first rotary driver 211 through the controller. After receiving the signal, the first rotary driver 211 drives the reciprocating screw 212 to rotate. The push block 231 is restricted by the guide rod 114 and cannot rotate around the axis of the reciprocating screw 212. Then, the push block 231 threadedly connected thereto is driven by the reciprocating screw 212 to move in a direction close to the clamping mechanism 3, while the threaded sleeve 232 is in a free rotation state. The movement of the mounting seat 12 is damped by the injection. When the reciprocating screw 212 rotates, it will drive the threaded sleeve 232 to rotate synchronously. The push block 231 is in a free rotation state. After the elastic push component 22 on 31 contacts the mounting seat 12, it pushes the mounting seat 12 to move. After the mold cavity is filled with raw materials, the mounting seat 12 is affected by resistance, and the elastic push component 22 is further compressed. When the elastic force of the elastic push component 22 increases to a threshold value, the push block 231 abuts against the threaded sleeve 232, and the rotation of the threaded sleeve 232 is limited by the friction between the push block 231 and the threaded sleeve 232. At this time, the mounting seat 12 is pushed by the elastic push component 22 and has a tendency to approach the head plate 31. The movement of the mounting seat 12 requires the threaded sleeve 232 to move with the reciprocating screw rod 2 12 rotates relative to each other. If the rotation of the threaded sleeve 232 is restricted, due to the continued rotation of the reciprocating screw rod 212, the threaded sleeve 232 will be resisted by the push block 231 and cannot continue to rotate. However, the rotation of the reciprocating screw rod 212 will try to drive the threaded sleeve 232 to move in the direction close to the push block 231, thereby causing the movement of the push block 231 and the threaded sleeve 232 to be blocked at the same time, thereby restricting the movement of the mounting seat 12. The linear drive component 21 stops driving after sensing the increase in resistance. At this time, the elastic force of the elastic push component 22 continuously applies pressure to the mounting seat 12 to perform pressure-holding molding. As the plastic cools and shrinks, the mounting seat 12 tends to move toward the head plate 31 under the pushing action of the elastic pushing component 22. As the push block 231 separates from the threaded sleeve 232, the friction force is reduced. At this time, the first rotary driver 211 stops driving, the reciprocating screw 212 is fixed, and the mounting seat 12 and the threaded sleeve 232 move away from the push block 231 under the elastic force of the elastic pushing component 22. Due to the reduction of resistance, the threaded sleeve 232 starts to rotate in the opposite direction under the action of the elastic pushing component 22, thereby allowing the mounting seat 12 to move further forward and complete the pushing.

[0037] Reference Figure 2 and Figure 6: The elastic pushing component 22 includes a main rod 221, a first elastic member 222 and a baffle 223; the main rod 221 is arranged on the push block 231, and a sub-rod 2211 is slidably arranged on the main rod 221; the two ends of the first elastic member 222 are respectively connected to the sub-rod 2211 and the push block 231; the baffle 223 is movably arranged on the mounting seat 12, and the baffle 223 is slidably matched with the guide rod 114; the mounting seat 12 is provided with an adjustment component 24 for controlling the movement of the baffle 223.

[0038] The present invention realizes the function of providing a stable thrust to the mounting seat 12 through the main rod 221, the first elastic member 222, the baffle 223, the docking groove 2321 and the adjustment component 24. When the push block 231 and the threaded sleeve 232 are in contact, the elastic force of the elastic push component 22 is adjusted by the adjustment component 24, thereby adjusting the pressure holding intensity. A piezoelectric ceramic for sensing the pressure is provided at the end of the secondary rod 2211 close to the baffle 223, and the pressure holding intensity is detected by the piezoelectric ceramic during the pressure holding process. The first elastic member 222 is preferably a compression spring. During the processing, the push block 231 is driven by the linear drive assembly 21 to move along the guide rod 114, and the push block 231 drives the main rod 221 to move, and the auxiliary rod 2211 on the main rod 221 is in an extended state under the elastic force of the first elastic member 222. When the end of the auxiliary rod 2211 on the main rod 221 contacts the baffle 223, the first elastic member 222 contracts due to the resistance. When the elastic force of the first elastic member 222 is sufficient to push the mounting seat, the elastic force of the first elastic member 222 is transmitted to the mounting seat 12 through the auxiliary rod 2211. The baffle 223 is pushed by the baffle 223 to move the mounting seat 12. After the mold cavity is filled with raw materials, the mounting seat 12 is affected by resistance, and the first elastic member 222 and the auxiliary rod 2211 are further compressed. When the push block 231 abuts against the threaded sleeve 232, the elastic force of the first elastic member 222 increases to a threshold value, and the limiting component 23 limits the movement of the mounting seat 12. The linear drive component 21 stops driving after sensing the increase in resistance. At this time, the elastic force of the elastic push component 22 continuously applies pressure to the mounting seat 12 to perform pressure-maintaining molding. Before processing, the baffle 223 can be controlled to move on the mounting seat 12 by the adjustment component 24, and then the distance between the baffle 223 and the push block 231 can be adjusted. When the push block 231 contacts the mounting seat 12 and the threaded sleeve 232 respectively, the compression amount of the first elastic member 222 is controlled, and then the elastic force provided by the first elastic member 222 is controlled.

[0039] Reference Figure 3 and Figure 7: A mounting ring 233 is provided at one end of the push block 231 close to the threaded sleeve 232, and a limit block 2331 and a second elastic member 2332 are provided on the mounting ring 233; the limit block 2331 is slidably installed on the mounting ring 233, and a docking groove 2321 cooperating with the limit block 2331 is provided on one side of the threaded sleeve 232 close to the mounting ring 233; both ends of the second elastic member 2332 are respectively connected to the limit block 2331 and the mounting ring 233.

[0040] The present invention realizes the function of stably limiting the rotation of the threaded sleeve 232 when the push block 231 abuts against the threaded sleeve 232 through the mounting ring 233 , the limiting block 2331 , the second elastic member 2332 and the docking groove 2321 . After the mold cavity is filled with raw materials, the mounting seat 12 is affected by resistance, and the elastic pushing component 22 is further compressed. When the elastic force of the elastic pushing component 22 increases to a threshold value, the mounting ring 233 on the push block 231 abuts against the threaded sleeve 232. If the limit block 2331 on the mounting ring 233 is not aligned with the docking groove 2321, the friction force on the threaded sleeve 232 is small, and the threaded sleeve 232 rotates with the rotation of the reciprocating screw 212 until the limit block 2331 on the mounting ring 233 is aligned with the docking groove 2321. The limit block 2331 is engaged with the docking groove 2321 under the elastic force of the second elastic member 2332, thereby limiting the rotation of the threaded sleeve 232, and by providing a plurality of docking grooves 2321 on the threaded sleeve 232, the range of deviation between the limit block 2331 and the docking groove 2321 is reduced, and the plurality of docking grooves 2321 are distributed in a circular array along the axis of the threaded sleeve 232. At this time, the mounting seat 12 is subjected to the thrust of the elastic pushing component 22, and has a tendency to approach the head plate 31. The movement of the mounting seat 12 requires the synchronous rotation of the threaded sleeve 232 and the reciprocating screw 212. When the rotation of the threaded sleeve 232 is restricted, the rotation of the reciprocating screw 212 will try to drive the threaded sleeve 232 to move in the direction close to the push block 231. The push block 231 has a tendency to move toward the threaded sleeve 232 under the rotation drive of the reciprocating screw 212, thereby hindering the movement of the push block 231 and the threaded sleeve 232 at the same time, thereby limiting the movement of the mounting seat 12.

[0041] Reference Figure 3 and Figure 7 when the limit block 2331 is plugged into the docking groove 2321, the mounting ring 233 limits the rotation direction of the threaded sleeve 232 through the interaction between the limit block 2331 and the docking groove 2321.

[0042] The present invention allows the threaded sleeve 232 to rotate in the direction of the oblique notch by providing an oblique notch on the limiting block 2331 , so that the threaded sleeve 232 can smoothly rotate in the reverse direction. During the pressure-holding molding process, as the plastic cools and shrinks, the mounting seat 12 tends to move toward the head plate 31 under the pushing action of the elastic pushing component 22. At this time, the first rotary driver 211 stops driving, the reciprocating screw 212 is fixed, and when the mounting seat 12 moves in the direction away from the push block 231, the threaded sleeve 232 needs to rotate in the opposite direction. When the threaded sleeve 232 rotates in the opposite direction, the oblique notch of the limit block 2331 contacts the inner wall of the docking groove 2321, thereby smoothly squeezing the limit block 2331. The squeezing force overcomes the elastic force of the second elastic member 2332 to compress the limit block 2331, so that the limit block 2331 is separated from the docking groove 2321, and the mounting seat 12 and the threaded sleeve 232 can move in the direction away from the push block 231 under the elastic force of the elastic pushing component 22, thereby completing the further pushing of the mounting seat 12, stabilizing the pressure holding strength, and improving the processing quality of the workpiece.

[0043] Reference Figure 6 , Figure 8 and Fig. 9 : The adjustment component 24 includes a second rotary driver 241, a screw 242, a pulley 243 and a transmission belt 244; the second rotary driver 241 is arranged on the mounting base 12; the screw 242 is rotatably arranged on the mounting base 12, and the screw 242 is threadedly connected to the baffle 223; there are two pulleys 243, and the two pulleys 243 are respectively sleeved on the driving end of the second rotary driver 241 and the screw 242; the transmission belt 244 connects the two pulleys 243.

[0044] The present invention realizes the function of controlling the movement of the baffle 223 through the second rotary driver 241, the screw 242, the pulley 243 and the transmission belt 244. The second rotary driver 241 is preferably a servo motor, and the servo motor is electrically connected to the controller. Before the forming process of the workpiece, the operator sends a signal to the second rotary driver 241 through the controller. After receiving the signal, the second rotary driver 241 drives the screw 242 to rotate through the pulley 243 and the transmission belt 244. The screw 242 drives the baffle 223 threadedly connected thereto to move on the mounting seat 12, thereby adjusting the position of the baffle 223 to ensure that when the push block 231 contacts the mounting seat 12 and the threaded sleeve 232, the spacing between the baffle 223 and the push block 231 is properly adjusted. , control the compression amount of the first elastic member 222, and then control the holding pressure provided by the first elastic member 222.

[0045] Reference Figure 4 and Fig.10: A first support 311 and an abutment rod 312 are provided on the head plate 31; the first support 311 is connected to the head plate 31, and the abutment rod 312 is arranged on the first support 311; a second support 321 is provided on the second plate 32, and an abutment block 3121 is provided at one end of the abutment rod 312 close to the second support 321, and a pressure sensor 322 is provided on the second support 321.

[0046] The present invention realizes the sensing of the clamping force through the first support 311, the abutment rod 312, the abutment block 3121, the second support 321 and the pressure sensor 322. The pressure sensor 322 is electrically connected to the controller. The clamping assembly 34 includes a second linear driver 341, a push frame 342, a first connecting rod 343, a second connecting rod 344 and a connecting frame 345. The second linear driver 341 is arranged on the tail plate 33, the push frame 342 is transmission-connected with the driving end of the second linear driver 341, the two ends of the second connecting rod 344 are respectively hinged to the connecting frame 345 and the tail plate 33, the two ends of the first connecting rod 343 are respectively hinged to the push frame 342 and the second connecting rod 344, and the connecting frame 345 is hinged to the second plate 32. In the working state, when the clamping assembly 34 drives the mold to reach a tight fit state, the second linear driver 341 pushes the second plate 32 through the push frame 342, the first connecting rod 343, the second connecting rod 344 and the connecting frame 345, thereby continuously providing pressure, and the abutment block 3121 on the abutment rod 312 contacts with the pressure sensor 322, and the clamping force is sensed in real time through the pressure sensor 322. Then, when the holding pressure provided by the driving mechanism changes, the clamping force is accurately adjusted accordingly to avoid the situation in which the mold is not tightly fitted during the processing and affects the molding quality of the workpiece.

[0047] Reference Fig.10 : An external thread is provided on the abutment rod 312, and the abutment rod 312 is threadedly connected to the first support 311; a rotating handle 313 is provided at one end of the abutment rod 312 away from the abutment block 3121.

[0048] The present invention realizes the function of adjusting the extension and contraction amount of the abutment rod 312 through the external thread and the rotating handle 313. When using molds of different models, after the molds are matched, the spacing between the head plate 31 and the second plate 32 is also different, and the driving stroke of the clamping assembly 34 also needs to be adjusted accordingly. For this reason, an external thread is set on the abutment rod 312, and the extension and contraction amount of the abutment rod 312 is adjusted by rotating the rotating handle 313, and then after the mold is closed, the abutment block 3121 of the abutment rod 312 can stably contact the pressure sensor 322 on the second support 321 to detect the clamping force.

[0049] Reference Figure 1 , Figure 4 and Fig.11: A locking adjustment mechanism 4 is provided on the tail plate 33, and the locking adjustment mechanism 4 includes an adjusting nut 41 and a synchronous drive assembly 42; at least two pull rods 331 and adjusting nuts 41 are provided, the pull rods 331 are slidably matched with the tail plate 33, the adjusting nut 41 is rotatably set on the tail plate 33, and the adjusting nut 41 is threadedly connected with the pull rods 331; the synchronous drive assembly 42 is used to drive multiple adjusting nuts 41 to rotate synchronously.

[0050] The present invention realizes the function of adjusting the distance between the tail plate 33 and the head plate 31 by adjusting the nut 41 and the synchronous drive assembly 42, thereby achieving the effect of adjusting the clamping distance. When making adjustments, the operator drives multiple adjusting nuts 41 to rotate synchronously through the synchronous drive assembly 42, and then drives the pull rod 331 to slide through the rotating adjusting nut 41, thereby driving the tail plate 33 to slide along the pull rod 331, thereby adjusting the distance between the head plate 31 and the tail plate 33.

[0051] Reference Figure 1 , Figure 4 and Fig.11 : The synchronous drive assembly 42 includes a third rotary driver 421, a first rotary gear 422, a gear ring 423 and a second rotary gear 424; the third rotary driver 421 is arranged on the tail plate 33; the first rotary gear 422 is sleeved on the driving end of the third rotary driver 421; the gear ring 423 is rotatably arranged on the tail plate 33, and the first rotary gear 422 is meshedly connected with the gear ring 423; there are at least two second rotary gears 424, and the second rotary gears 424 are sleeved on the adjusting nut 41, and multiple second rotary gears 424 are all meshedly connected with the gear ring 423.

[0052] The present invention realizes the function of driving multiple adjustment screw nuts 41 to rotate synchronously through the third rotation driver 421, the first rotation gear 422, the gear ring 423 and the second rotation gear 424. The third rotation driver 421 is preferably a servo motor, and the third rotation driver 421 is electrically connected to the controller; when adjusting, the operator sends a signal to the third rotation driver 421 through the controller, and the third rotation driver 421 drives the first rotation gear 422 to rotate after receiving the signal, and the first rotation gear 422 drives the gear ring 423 meshing with it to rotate, and the gear ring 423 drives multiple second rotation gears 424 to rotate synchronously, and then drives the adjustment screw nut 41 to rotate through the second rotation gear 424, so as to adjust the spacing between the head plate 31 and the tail plate 33.

[0053] The above embodiments only express one or several implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. An intelligent pressure-maintaining mechanism for an injection molding machine, characterized in that: It comprises an injection mechanism (1), a driving mechanism (2) and a clamping mechanism (3); The injection mechanism (1) comprises a mounting frame (11) and a mounting seat (12); a guide rail (111) and a first linear driver (112) are provided on the mounting frame (11); the mounting seat (12) is slidably disposed on the guide rail (111); the first linear driver (112) is used to drive the mounting seat (12) to reset; and the mounting seat (12) is connected to an injection rod in a barrel; The driving mechanism (2) comprises a linear driving component (21), an elastic pushing component (22) and a limiting component (23); the linear driving component (21) pushes the mounting seat (12) to move along the guide rail (111) via the elastic pushing component (22); and the limiting component (23) is used to limit the movement of the mounting seat (12); The mold locking mechanism (3) comprises a head plate (31), a second plate (32), a tail plate (33), and a mold locking assembly (34) for providing a mold locking force; a pull rod (331) is provided on the tail plate (33); the head plate (31) is connected to the pull rod (331); and the second plate (32) is slidably matched with the pull rod (331); In a working state, when the thrust of the elastic pushing component (22) on the mounting seat (12) exceeds a threshold value, the limiting component (23) limits the movement of the mounting seat (12), the linear driving component (21) stops driving, and the mounting seat (12) is acted upon by the elastic force of the elastic pushing component (22); The linear drive assembly (21) comprises a first rotary drive (211) and a reciprocating screw rod (212); The first rotary driver (211) is arranged on the mounting frame (11); A support seat (113) and a guide rod (114) are provided on the mounting frame (11); The reciprocating screw rod (212) is rotatably mounted on the mounting frame (11), and the reciprocating screw rod (212) is rotatably connected to the support seat (113); The limiting assembly (23) includes a push block (231) and a threaded sleeve (232); The push block (231) is connected to the reciprocating screw rod (212) via a thread and slides along the guide rod (114); the elastic push assembly (22) is arranged on the push block (231); The threaded sleeve (232) is rotatably arranged on the mounting seat (12), the threaded sleeve (232) is threadedly connected to the reciprocating screw rod (212), and the thread direction of the threaded sleeve (232) is opposite to the thread direction on the push block (231).

2. The intelligent pressure-maintaining mechanism for an injection molding machine according to claim 1, characterized in that: The elastic pushing assembly (22) comprises a main rod (221), a first elastic member (222) and a baffle (223); The main rod (221) is arranged on the push block (231), and a secondary rod (2211) is slidably arranged on the main rod (221); Two ends of the first elastic member (222) are respectively connected to the auxiliary rod (2211) and the push block (231); The baffle plate (223) is movably arranged on the mounting seat (12), and the baffle plate (223) is slidably matched with the guide rod (114); An adjustment assembly (24) for controlling the movement of the baffle (223) is provided on the mounting seat (12).

3. The intelligent pressure-maintaining mechanism for an injection molding machine according to claim 1, characterized in that: A mounting ring (233) is provided at one end of the push block (231) close to the threaded sleeve (232), and a limit block (2331) and a second elastic member (2332) are provided on the mounting ring (233); The limit block (2331) is slidably mounted on the mounting ring (233), and a docking groove (2321) matching with the limit block (2331) is formed on a side of the threaded sleeve (232) close to the mounting ring (233); Two ends of the second elastic member (2332) are respectively connected to the limit block (2331) and the mounting ring (233).

4. The intelligent pressure-maintaining mechanism for an injection molding machine according to claim 3, characterized in that: An oblique notch is provided on one side of the limit block (2331); When the limiting block (2331) is plugged into and matched with the docking groove (2321), the mounting ring (233) limits the rotation direction of the threaded sleeve (232) through the interaction between the limiting block (2331) and the docking groove (2321).

5. The intelligent pressure-maintaining mechanism for an injection molding machine according to claim 2, characterized in that: The adjustment assembly (24) comprises a second rotation driver (241), a screw rod (242), a pulley (243) and a transmission belt (244); The second rotary driver (241) is arranged on the mounting seat (12); The screw rod (242) is rotatably disposed on the mounting seat (12), and the screw rod (242) is threadably connected to the baffle plate (223); There are two pulleys (243), and the two pulleys (243) are respectively sleeved on the driving end of the second rotary driver (241) and the screw rod (242); The transmission belt (244) connects the two pulleys (243).

6. The intelligent pressure-maintaining mechanism for an injection molding machine according to claim 1, characterized in that: A first support (311) and an abutment rod (312) are provided on the head plate (31); The first support (311) is connected to the head plate (31), and the abutment rod (312) is arranged on the first support (311); A second support (321) is provided on the second plate (32), an end of the abutment rod (312) close to the second support (321) is provided with an abutment block (3121), and a pressure sensor (322) is provided on the second support (321).

7. The intelligent pressure-maintaining mechanism for an injection molding machine according to claim 6, characterized in that: An external thread is provided on the abutment rod (312), and the abutment rod (312) is threadably connected to the first support seat (311); A rotating handle (313) is provided at one end of the abutment rod (312) away from the abutment block (3121).

8. The intelligent pressure-maintaining mechanism for an injection molding machine according to claim 1, characterized in that: A mold locking adjustment mechanism (4) is provided on the tail plate (33), and the mold locking adjustment mechanism (4) comprises an adjustment nut (41) and a synchronous drive assembly (42); At least two pull rods (331) and adjusting screw nuts (41) are provided, the pull rods (331) are slidably matched with the tail plate (33), the adjusting screw nuts (41) are rotatably arranged on the tail plate (33), and the adjusting screw nuts (41) are threadedly connected to the pull rods (331); The synchronous driving assembly (42) is used to drive the plurality of adjusting screw nuts (41) to rotate synchronously.

9. The intelligent pressure-maintaining mechanism for an injection molding machine according to claim 8, characterized in that: The synchronous drive assembly (42) comprises a third rotary driver (421), a first rotary gear (422), a gear ring (423) and a second rotary gear (424); The third rotary driver (421) is arranged on the tail plate (33); The first rotating gear (422) is sleeved on a driving end of the third rotating driver (421); The gear ring (423) is rotatably arranged on the tail plate (33), and the first rotating gear (422) is meshingly connected with the gear ring (423); At least two second rotating gears (424) are provided, and the second rotating gears (424) are sleeved on the adjusting nut (41), and the plurality of second rotating gears (424) are all meshedly connected with the gear ring (423).

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