Injection system moving mechanism and injection molding machine using the same

Abstract

The application discloses a kind of injection system moving mechanism and the injection molding machine of applying it, belong to injection molding machine injection technical field, including injection assembly, fixed die seat and guide rail, the fixed die seat is fixed in the front of the guide rail, the injection assembly is slidably connected on the guide rail, further include moving assembly, the moving assembly is set in the lower part of the injection assembly, the moving assembly includes pull rod, movable rod and linkage device, one end of the pull rod is swingly connected on the fixed die seat, and the other end is threadedly connected with one end of the movable rod, the movable rod is connected with the linkage device, the linkage device is set on the injection assembly, and the linkage device drives the movable rod to rotate, using threadedly connected in the swing lever and the movable rod can eliminate error and vibration in transmission process, threadedly connected in stability and high moving precision makes the injection assembly reciprocating repeatedly positioned high precision, guarantee the appearance quality of injection molding part.

Description

Technical Field

[0001] This invention relates to the field of injection molding technology, specifically to an injection system moving mechanism and an injection molding machine using the same. Background Technology

[0002] Injection molding machines are molding equipment that uses plastic molds to produce various shapes of plastic products from thermoplastic or thermosetting plastics. Injection molding machines heat the plastic and apply high pressure to the molten plastic, causing it to be injected and fill the mold cavity. Injection molding is a common product molding method widely used in production and daily life. Generally, an injection molding machine consists of an injection system, a mold clamping system, a hydraulic transmission system, an electrical control system, a lubrication system, a heating and cooling system, and a safety monitoring system. During operation, the injection system moves the injection head back and forth to enter the mold and complete the plastic injection. When the mold opens, the injection head needs to exit the mold. This process needs to be completed stably and precisely to ensure good dimensional and appearance quality of the molded injection products.

[0003] A patent with publication number CN203901574U discloses a mold closing guide mechanism, including a guide sleeve fixed on a fixed mold and a guide post fixed on a moving mold. The guide post extends into the guide sleeve, and a ball sleeve is fitted at the end of the guide post that extends into the guide sleeve. The connection structure between the guide post and the ball sleeve is as follows: a positioning step is provided on the outer wall of the guide post, and a limiting block is provided at the end of the guide post. The ball sleeve is clamped between the positioning step and the limiting block, and the limiting block is fixedly connected to the guide post by screws. A circumferential positioning structure is provided between the surface of the positioning step and the end face of the ball sleeve. The circumferential positioning structure is composed of positioning blocks and positioning grooves distributed along the circumferential direction. This mold closing guide mechanism has a short guiding stroke for rapid continuous mold closing and cannot absorb vibration and errors during repeated sliding, making it unsuitable for rapid continuous output to drive the injection head. Summary of the Invention

[0004] One of the objectives of this invention is to provide a moving mechanism for an injection system that solves the problems of transmission errors and unstable power transmission in existing moving mechanisms for injection systems.

[0005] To achieve the above-mentioned objectives, the technical solution adopted by the present invention is as follows:

[0006] An injection system moving mechanism includes an injection assembly, a fixed mold base, and a guide rail. The fixed mold base is fixed in front of the guide rail, and the injection assembly is slidably connected to the guide rail. The mechanism also includes a moving assembly disposed below the injection assembly. The moving assembly includes a pull rod, a moving rod, and a linkage device. One end of the pull rod is oscillatingly connected to the fixed mold base, and the other end is threadedly connected to one end of the moving rod. The moving rod is connected to the linkage device, which is disposed on the injection assembly and drives the moving rod to rotate. The threaded connection between the pull rod and the moving rod eliminates errors and vibrations during transmission. The threaded connection provides high stability and movement accuracy, resulting in high repeatability of the reciprocating injection assembly and ensuring good appearance quality of the injection molded part.

[0007] Furthermore, the moving rod includes a lead screw portion and a guide rod portion. The lead screw portion is disposed at one end of the moving rod, and the guide rod portion is disposed at the other end of the moving rod. The pull rod includes a threaded sleeve portion, which is disposed at the other end of the pull rod. The lead screw portion and the threaded sleeve portion are internally connected by a screw thread. The threaded connection between the lead screw portion and the guide rod portion is stable and reliable, and can control the maximum travel of the injection assembly, preventing the injection assembly from overtraveling and damaging the mold, thus improving the safety of the injection assembly's movement.

[0008] Preferably, the linkage device includes a first synchronous pulley, a tension pulley, a mounting plate, a motor, and a transmission belt. The mounting plate is disposed below the injection assembly, the first synchronous pulley is sleeved on the moving rod, the motor is disposed on the mounting plate, the tension pulley is disposed on one side of the first synchronous pulley, and the transmission belt connects the motor and the first synchronous pulley, which can drive the moving rod to rotate and thus move the injection assembly.

[0009] Preferably, the device also includes a transmission mechanism, which includes a bushing, a bearing, and a pressure cap. The bushing is fitted onto the middle of the moving rod, and one end face of the bushing is fixed to the first synchronous pulley. The bearing is fitted onto the outer side wall of the bushing, and the pressure cap is disposed on one end of the bearing to press the bearing tightly, thereby preventing gaps from occurring during the transmission of power and displacement by the moving rod, which could lead to errors in the movement of the injection assembly.

[0010] Preferably, the depth of the threaded sleeve is greater than the length of the lead screw, and the shoulder of the lead screw forms a limiting position.

[0011] Preferably, the linkage device further includes a second synchronous pulley, which is rotatably connected to the injection assembly. The transmission belt synchronously drives the first and second synchronous pulleys to rotate, thereby driving the movement of multiple sets of moving rods and swing rods. This can evenly pull the injection assembly to move and improve the stability of the injection assembly's high-speed reciprocating movement.

[0012] Preferably, the system also includes a swing seat, which is disposed on the fixed mold base. The swing seat includes a base body and a top sleeve. One end of the pull rod is sway-connected to the base body. The top sleeve is disposed in the fixed mold base, and one end of the top sleeve abuts against the base body. The height of the swing seat can be adjusted by the top sleeve to ensure accurate connection between the moving rod and the swing rod, facilitating installation and debugging.

[0013] Preferably, the other end of the moving rod extends beyond the linkage device into the interior of the injection assembly, which can balance the two ends of the moving rod and improve the stability of the rotation of the moving rod.

[0014] Preferably, a limiting device is also included, which is disposed below the injection assembly along the direction of the guide rail. The limiting device is used to detect the moving distance of the injection assembly and can also be used to limit the retraction position of the injection assembly to prevent the injection assembly from overtraveling.

[0015] The second objective of this invention is to provide an injection molding machine that solves the problems of slow response speed and low alignment accuracy of the injection head during operation in existing injection molding machines.

[0016] To achieve the above-mentioned objectives, the technical solution adopted by the present invention is as follows:

[0017] An injection molding machine includes the aforementioned injection system moving mechanism, which can drive the injection head to reciprocate rapidly, thereby achieving high-efficiency production of injection molded parts.

[0018] The beneficial effects of this invention are as follows:

[0019] (1) The injection system moving mechanism is equipped with an injection assembly, which includes a pull rod, a moving rod and a linkage device. One end of the pull rod is oscillatingly connected to the fixed mold base, which can absorb vibration and error in the transmission process and improve the accuracy and stability of the injection system movement. The other end of the pull rod is threadedly connected to the moving rod to transmit the power to drive the injection assembly to move. The threaded connection transmits power stably and has high displacement accuracy, which is suitable for repeated rapid movement. The linkage device outputs force to drive the moving rod to rotate. The moving rod is rotatably connected to the injection assembly. During the rotation, the moving rod shortens the distance with the pull rod, thereby pulling the injection assembly to move back and forth.

[0020] (2) The moving mechanism of the injection system is also equipped with a transmission device, which includes a bushing, a bearing and a pressure cap. The bushing is sleeved on the moving rod. The outer wall of the bushing is rotatably connected to the injection assembly through the bearing. One end of the bushing is connected to the first synchronous pulley. The bushing and the moving rod are driven to rotate by the first synchronous pulley. The bushing is locked on the injection assembly by the pressure cap, so that the pull rod only rotates while its relative position with the injection assembly remains stationary. The rotation of the first synchronous pulley can pull the injection assembly to move as a whole. The helical displacement of the lead screw on the moving rod is separated into the rotation of the bushing and the movement of the injection assembly. The transmission has high stability and rapid motion response.

[0021] (3) The moving mechanism of the injection system is also equipped with a swing seat, which includes a seat body and a top sleeve. The swing connection between the seat body and the other end of the pull rod can absorb the vibration and error in the transmission process. The top sleeve is installed in the mold seat, which can flatten and raise the seat body so that the axis of the pull rod and the moving rod are aligned, thereby improving the transmission accuracy. It can also adjust the installation error of the pull rod and reduce the debugging difficulty.

[0022] (4) The moving mechanism of the injection system is provided with two sets of moving rods and pull rods. The linkage device is also provided with a second synchronous wheel that rotates on the same side as the first synchronous wheel, which is used to drive the moving rod at the other end to rotate, thereby pulling the injection assembly back and forth on the guide rail in a balanced manner from both sides, ensuring the stability of the movement of the injection assembly. The connection between the moving rod and the synchronous wheel is in the middle of the moving rod, so that the moving rod is in a balanced state during rotation, which improves the stability of the moving rod driving the injection assembly to move. Attached Figure Description

[0023] Figure 1 An isometric view of the moving mechanism of the injection system provided by the present invention;

[0024] Figure 2 A front view of the moving mechanism of the injection system provided by the present invention;

[0025] Figure 3 A side view of the moving mechanism of the injection system provided by the present invention;

[0026] Figure 4 A top view of the moving mechanism of the injection system provided by the present invention;

[0027] Figure 5 for Figure 2 Cross-sectional view along the upper AA line;

[0028] Figure 6 for Figure 3 Cross-sectional view along the upper BB line;

[0029] Figure 7 for Figure 6 The partial view shown in section C above;

[0030] Figure 8 An isometric view of the moving component provided by the present invention;

[0031] Figure 9 Top view of the movable component provided by the present invention;

[0032] Figure 10 A structural diagram of the mobile component provided for implementation two.

[0033] Figure label:

[0034] 1. Fixed mold base; 2. Injection assembly; 21. Injection head; 22. Frame; 23. Limiting device; 231. Limiting rod; 232. Limiting seat; 24. Slider; 3. Moving assembly; 31. Swing seat; 311. Seat body; 312. Top sleeve; 32. Tie rod; 321. Screw sleeve; 322. Turntable; 33. Moving rod; 331. Lead screw; 332. Guide rod; 34. Transmission device; 341. Bushing; 342. Cover; 343. Bearing; 344. Pressure cover; 35. Linkage device; 351. Second synchronous pulley; 352. First synchronous pulley; 353. Tension wheel; 354. Mounting plate; 355. Motor; 356. Transmission belt; 357. Synchronization device; 4. Guide rail. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments in the application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0036] Example 1

[0037] like Figures 1-9As shown, this invention discloses a moving mechanism for an injection system, including an injection assembly 2, a fixed mold base 1, a guide rail 4, and a moving assembly 3. The fixed mold base 1 is fixed in front of the guide rail 4, the injection assembly 2 is slidably connected to the guide rail 4, and the moving assembly 3 is disposed at the lower part of the injection assembly 2. The moving assembly 3 includes a pull rod 32, a moving rod 33, and a linkage device 35. One end of the pull rod 32 is oscillatingly connected to the fixed mold base 1 and can oscillate in a direction perpendicular to the ground. This can compensate for the deviation between the pull rod 32 and the moving rod 33, enabling the moving rod 33 to move stably and accurately along the direction of the guide rail 4. The other end of the pull rod 32 is threadedly connected to one end of the moving rod 33. The moving rod 33 is connected to the linkage device 35, which is disposed on the injection assembly 2. The linkage device 35 drives the moving rod 33 to rotate. Utilizing the threaded connection between the moving rod 33 and the pull rod 32, the moving rod 33 changes the overall length of the moving rod 33 and the pull rod 32 during rotation, causing the injection assembly 2 connected to the moving rod 33 to move towards the fixed mold base 1 under the guidance of the guide rail 4.

[0038] The injection assembly 2 includes an injection head 21, a frame 22, and a slider 24. The injection head 21 can pass through the center of the fixed mold base 1 and extend into the mold to complete the plastic injection. The frame 22 is mounted on the slider 24, and the slider 24 is connected to the guide rail 4 to guide the injection head 21 when it moves, thereby improving the accuracy of the repositioning of the injection head 21.

[0039] Furthermore, the moving rod 33 includes a lead screw portion 331 and a guide rod portion 332. The lead screw portion 331 is disposed on one end of the moving rod 33, and the guide rod portion 332 is disposed near the other end of the moving rod 33. The pull rod 32 includes a threaded sleeve portion 321, which is disposed on the other end of the pull rod 32. The lead screw portion 331 and the threaded sleeve portion 321 are internally connected by a screw, which limits the distance that the lead screw portion 331 can move, restricting the travel of the injection assembly 2 and preventing the injection head 21 from overtraveling and damaging the mold.

[0040] Among them, the lead screw part 331 and the threaded sleeve part 321 have a hardened layer formed on their surfaces after quenching treatment. The lead screw part 331 and the threaded sleeve part 321 after quenching treatment have better wear resistance, lower wear degree after long-term use, and extended service life and transmission accuracy.

[0041] Preferably, the linkage device 35 includes a first synchronous pulley 352, a tension pulley 353, a mounting plate 354, a motor 355, and a transmission belt 356. The mounting plate 354 is disposed below the injection assembly 2. The first synchronous pulley 352 is sleeved on the moving rod 33. The motor 355 is disposed on the mounting plate 354. The tension pulley 353 is disposed on one side of the first synchronous pulley 352. The transmission belt 356 connects the motor 355 and the first synchronous pulley 352. The tension pulley 353 is mounted on the mounting plate 354. By moving the tension pulley 353, the transmission belt 356 is pressed to prevent slippage between the transmission belt 356 and the first synchronous pulley 352.

[0042] Preferably, the depth of the threaded sleeve portion 321 is greater than the length of the lead screw portion 331, and the shoulder of the lead screw portion 331 forms a limit to prevent the injection head 21 from over-rushing and causing damage.

[0043] Furthermore, the moving mechanism of the injection system is also provided with a transmission device 34, including a bushing 341, a bearing 343, and a pressure cap 344. The bushing 341 is sleeved on the middle of the moving rod 33 and is used to directly drive the moving rod 33 to rotate. One end face of the bushing 341 is fixed on the first synchronous wheel 352. The bearing 343 is sleeved on the outer side wall of the bushing 341. The pressure cap 344 is set on one end of the bearing 343. The pressure cap 344 is provided with a step. The stepped part of the pressure cap 344 is bolted to the mounting plate 354. The pressure cap 344 is snapped onto the outward end of the bushing 341 and is used to press the bearing 343 to transmit the power of the injection head 21 to move and prevent the bearing 343 from shaking along the axial direction of the bushing 341.

[0044] In addition, a cover 342 is provided at the other end of the bushing 341. The cover 342 is interference-fitted to the bushing 341 and serves as a limit for the installation of multiple bearings 343 onto the bushing 341. Together with the pressure cover 344, the multiple bearings 343 can be stably restricted on the bushing 341 to prevent gaps from forming between the moving rod 33 and the frame 22 during reciprocating movement, which would cause a decrease in movement accuracy.

[0045] Preferably, it also includes a swing seat 31, which is disposed on the fixed mold base 1. The swing seat 31 includes a base body 311 and a top sleeve 312. One end of the pull rod 32 is sway-connected to the base body 311. The top sleeve 312 is disposed in the fixed mold base 1, and one end of the top sleeve 312 abuts against the base body 311. The base body 311 is provided with a boss with a hole. One end of the pull rod 32 is provided with a turntable 322. The turntable 322 and the boss are connected by a pin, so that the pull rod 32 swings toward the injection assembly 2.

[0046] Preferably, the linkage device 35 further includes a second synchronous wheel 351, which is rotatably connected to the injection assembly 2, and the transmission belt 356 is connected to the second synchronous wheel 351, driving the second synchronous wheel 351 and the first synchronous wheel 352 to rotate at the same speed. When the injection assembly 2 is equipped with two magnetic rods 33 and a pull rod 32, the motor 355 drives the first synchronous wheel 352 and the second synchronous wheel 351 to rotate through the transmission belt 356, which can balance and push the injection head 21 to move towards the fixed mold base 1, thereby improving the stability of the movement of the injection head 21.

[0047] The other end of the moving rod 33 extends beyond the linkage device 35 and into the lower part of the injection assembly 2 to balance the weight of the two ends of the moving rod 33 centered on the linkage device 35, reduce the degree of vibration of the moving rod 33, and improve the stability of the moving rod 33 during rapid rotation.

[0048] The injection system's moving mechanism is also equipped with a limiting device 23. The limiting device 23 is located below the injection assembly 2 along the direction of the guide rail 4. The limiting device 23 includes a limiting rod 231 and a limiting seat 232. The limiting rod 231 is installed below the injection assembly 2 and is located between the two guide rails 4. The limiting seat 232 is installed on the bed. The limiting rod 231 slides on one side of the limiting seat 232. A position sensor is provided inside the limiting seat 232. The moving distance of the injection head 21 is determined by the moving distance of the limiting rod 231. The stroke range of the injection head 21 can be determined by adjusting the mark on the limiting rod 231.

[0049] An injection molding machine includes an injection system moving mechanism and a mold closing mechanism, the mold closing mechanism being located on the other side of a fixed mold base 1.

[0050] The working process of this injection molding machine is as follows:

[0051] When the injection molding machine performs the injection molding operation, the mold closing mechanism pushes the moving mold onto the fixed mold base 1 to complete the mold assembly. Then, the moving component 3 drives the injection head 21 on the guide rail 4 to pass through the fixed mold base 1 and enter the mold. After injecting molten plastic into the mold, it is held under pressure for a period of time. After the mold closing mechanism opens the mold, the molded plastic part is removed. At the same time, the injection head 21 moves backward under the drive of the moving component 3 and triggers the limit device 23 to stop. At this time, the injection head 21 retracts to the outside of the mold. After removing the plastic part, the mold closes again and the injection head 21 completes the injection molding. During the injection molding process, the high-speed mold has a short injection and molding time. The injection head 21 moves back and forth quickly under the drive of the moving component 3 to complete the injection molding process.

[0052] Example 2

[0053] like Figure 10 As shown, the present invention also discloses a moving mechanism for an injection system, the difference being that: a synchronization device 357 is provided on two or more sets of moving rods 33. The synchronization device 357 includes two equally sized synchronization pulleys, both of which are mounted on the other end of the moving rods 33. The synchronization pulleys are connected by a synchronization belt. When the motor 355 drives the two moving rods 33 to rotate via the transmission belt 256, the synchronization device 357 can prevent rotational deviation between the two moving rods 33, improve the synchronization accuracy of the two moving rods 33, and at the same time fix the part of the moving rod 33 away from the linkage device 35 together, reducing vibration and deviation during the rotation of the moving rod 33 and improving the stability of the transmission.

[0054] Based on the disclosure and teachings of the foregoing specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and any modifications and changes to the present invention should also fall within the protection scope of the claims of the present invention. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on the present invention.

Claims

1. An injection system moving mechanism, comprising an injection assembly (2), a fixed mold base (1), and a guide rail (4), wherein the fixed mold base (1) is fixed in front of the guide rail (4), and the injection assembly (2) is slidably connected to the guide rail (4), characterized in that: It also includes a moving component (3), which is disposed at the lower part of the injection assembly (2). The moving component (3) includes a pull rod (32), a moving rod (33), and a linkage device (35). One end of the pull rod (32) is sway-connected to the fixed mold base (1), and the other end is threadedly connected to one end of the moving rod (33). The moving rod (33) is connected to the linkage device (35). The linkage device (35) is disposed on the injection assembly (2), and the linkage device (35) drives the moving rod (33) to rotate. The moving rod (33) includes a lead screw portion (331) and a guide rod portion (332). The lead screw portion (331) is disposed on one end of the moving rod (33), and the guide rod portion (332) is disposed near the other end of the moving rod (33). The pull rod (32) includes a threaded sleeve portion (321), which is disposed on the other end of the pull rod (32). The lead screw portion (331) and the threaded sleeve portion (321) are internally helically connected. The linkage device (35) includes a first synchronous pulley (352), a tension pulley (353), a mounting plate (354), a motor (355), and a transmission belt (356). The mounting plate (354) is located below the injection assembly (2). The first synchronous pulley (352) is sleeved on the moving rod (33). The motor (355) is located on the mounting plate (354). The tension pulley (353) is located on one side of the first synchronous pulley (352). The transmission belt (356) connects the motor (355) and the first synchronous pulley (352). The linkage device (35) also includes a second synchronous pulley (351), which is rotatably connected to the injection assembly (2), and the transmission belt (356) is connected to the second synchronous pulley (351), driving the second synchronous pulley (351) and the first synchronous pulley (352) to rotate at the same speed. When the injection assembly (2) is equipped with two moving rods (33) and a pull rod (32), the motor (355) drives the first synchronous pulley (352) and the second synchronous pulley (351) to rotate through the transmission belt (356), which can balance and push the injection head (21) to move towards the fixed mold base (1).

2. The injection system moving mechanism according to claim 1, characterized in that: It also includes a transmission device (34), which includes a bushing (341), a bearing (343), and a pressure cap (344). The bushing (341) is sleeved on the middle part of the moving rod (33), and one end face of the bushing (341) is fixed on the first synchronous pulley (352). The bearing (343) is sleeved on the outer side wall of the bushing (341), and the pressure cap (344) is disposed on one end of the bearing (343) to press the bearing (343).

3. The injection system moving mechanism according to claim 2, characterized in that: The depth of the threaded sleeve (321) is greater than the length of the lead screw (331).

4. The injection system moving mechanism according to claim 3, characterized in that: The linkage device (35) further includes a second synchronous pulley (351), which is rotatably connected to the injection assembly (2), and the transmission belt (356) synchronously drives the first synchronous pulley (352) and the second synchronous pulley (351) to rotate.

5. The injection system moving mechanism according to any one of claims 1-4, characterized in that: It also includes a swing seat (31), which is disposed on the fixed mold base (1). The swing seat (31) includes a base body (311) and a top sleeve (312). One end of the pull rod (32) is swayed and connected to the base body (311). The top sleeve (312) is disposed in the fixed mold base (1), and one end of the top sleeve (312) abuts against the base body (311).

6. The injection system moving mechanism according to claim 5, characterized in that: The other end of the moving rod (33) extends beyond the linkage device (35) and into the underside of the injection assembly (2).

7. The injection system moving mechanism according to claim 1, characterized in that: It also includes a limiting device (23), which is disposed below the injection assembly (2) along the direction of the guide rail (4).

8. An injection molding machine, characterized in that: Includes the injection system moving mechanism as described in any one of claims 1-7.

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