Mold opening and closing mechanism of electric blow molding machine

Abstract

The invention relates to the technical field of blow molding, and particularly discloses an electric blow molding machine mold opening and closing mechanism which comprises a blow molding machine body, two molds are arranged in the blow molding machine body, blow molding processing can be carried out when the two molds are closed, and the mold opening and closing mechanism further comprises a movement assembly which is arranged in the blow molding machine body and used for moving the movement assembly. The movement assembly comprises a cross rod fixedly connected to the interior of the blow molding machine body, movement frames are slidably connected to the two sides of the top of the cross rod, and mounting frames are slidably arranged on the sides, close to each other, of the two movement frames. By adopting the structure, surface contact can be instantly changed into line contact, and the contact area is greatly reduced, so that great friction force and vacuum adsorption force caused by a huge contact surface between a product and a cavity during mold opening can be reduced, the condition that the surface of the product is scratched or the stress is whitened is reduced, and the quality of the produced product is improved.

Description

Technical Field

[0001] This invention relates to the field of blow molding technology, and in particular to the mold opening and closing mechanism of an electric blow molding machine. Background Technology

[0002] In daily life, a lot of plastic waste is generated. This plastic waste is difficult to degrade. Plastic waste can be recycled and reused. Recycled plastic waste can be used for blow molding to process it into suitable products. A blow molding machine is a molding equipment used to manufacture hollow plastic products. Its core principle is to place a heated and softened plastic preform into a mold, use compressed air to inflate it and make it fit the inner wall of the mold, and after cooling, demold it to obtain a hollow product of the desired shape. The mold opening and closing mechanism of the blow molding machine is an important component of the blow molding machine.

[0003] Traditional blow molding machines mostly use linear motion for mold opening and closing mechanisms. For example, the "Mold Opening and Closing Device for a Blow Molding Machine" with publication number "CN220429248U" retracts the drive shaft of the push rod motor, then closes the electromagnet, and the electromagnet is no longer attached to the side plate for positioning. The tension spring drives the mold to move outward. Conversely, the electromagnet is opened, and after the mold returns to its original position by a large margin, the push rod motor moves the mold towards the secondary inward. The mold opening and closing is performed using linear motion.

[0004] However, when opening and closing the mold in linear motion, for large, soft products or products with high surface finish requirements, the huge contact area between the product and the cavity during parallel mold opening will generate a lot of friction and vacuum suction force, making it difficult to open the mold and easily causing scratches or stress whitening on the product surface, thus affecting the quality of the produced products. Summary of the Invention

[0005] The purpose of this invention is to provide an opening and closing mold mechanism for an electric blow molding machine, which can rotate the mold at a certain angle to move the two molds away from each other. When the mold is opened by rotation, the surface contact can be instantly changed to line contact, which greatly reduces the contact area. This helps to reduce the large friction and vacuum adsorption forces generated by the huge contact area between the product and the cavity during mold opening, thereby reducing scratches or stress whitening on the product surface and improving the quality of the produced products, thus solving the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an electric blow molding machine mold opening and closing mechanism, comprising a blow molding machine body, wherein two molds are configured inside the blow molding machine body, and blow molding can be performed when the two molds are closed, characterized in that the mold opening and closing mechanism further includes: A motion assembly, configured inside the blow molding machine body, includes a crossbar fixedly connected to the inside of the blow molding machine body. Motion frames are slidably connected to both sides of the top of the crossbar. Mounting frames are slidably connected to the side of the two motion frames that are close to each other. A spring is fixedly connected between the mounting frame and the motion frame. A rotating shaft is rotatably connected to both the top and bottom ends of the mounting frame. The rotating shaft rotates with the mold, and a first torsion spring is fixed between the rotating shaft and the mold. A first rack is fixedly connected to the top of each of the two motion frames. A first gear is fixedly connected to the outer wall of the upper rotating shaft. The first gear meshes with the first rack. A drive unit for driving the motion frames is configured inside the crossbar.

[0007] Preferably, the drive unit includes a motor fixedly connected to the inner side of the crossbar, the output shaft of the motor is fixedly connected to a bidirectional lead screw, the end of the bidirectional lead screw away from the motor is rotatably connected to the inner side of the crossbar, and the bottom of the two motion frames are respectively threaded to the outer walls of the two sides of the bidirectional lead screw.

[0008] Preferably, the first gears on both sides are misaligned with the first rack.

[0009] Preferably, the outside of the mold is provided with a cutting assembly for cutting the molded part. The cutting assembly includes a connecting frame fixedly connected to the rear end of the crossbar. A limiting ring is fixedly inserted into the top front end of the connecting frame. A cutting ring is rotatably connected to the top position of the limiting ring. A cutting blade is disposed on the inner side of the cutting ring. The limiting ring is located above the mold.

[0010] Preferably, the motion frame on the left side is fixedly connected to a second rack, and the outer side of the cutting ring is fixedly connected to a second gear. The second gear meshes with the second rack, and the second rack is slidably connected to the connecting frame.

[0011] Preferably, an infeed assembly is provided above the mold. The infeed assembly includes a groove at the rear end of the second rack. A rotating frame is fixedly connected inside the groove. An extrusion strip is rotatably connected to the outer wall of the rotating frame. The right side of the extrusion strip fits against the inner side of the groove. An extrusion plate is slidably connected to the top of the connecting frame at the rear end of the second rack. A medium bladder is provided at the rear end of the extrusion plate. A small tube is inserted into the bottom of the medium bladder. The bottom of the small tube is inserted into the interior of the connecting frame. A second torsion spring is fixed between the extrusion strip and the rotating frame.

[0012] Preferably, the feed assembly further includes a partition fixed inside the limiting ring, the inside of the connecting frame and the inner side of the limiting ring are connected above the partition, the feed assembly further includes a first elastic membrane fixed inside the cutting ring, a slide rod is fixedly connected inside the first elastic membrane, the end of the slide rod is fixedly connected to the cutting blade, the feed assembly further includes a second elastic membrane fixed inside the cutting ring, a compression ring is disposed at the bottom of the second elastic membrane, the compression ring is slidably connected to the cutting ring, a limit frame is fixedly connected at the bottom of the cutting ring, a push rod is slidably disposed inside the limit frame, and a third elastic membrane is fixed at the bottom of the push rod.

[0013] Preferably, the top of the push rod is provided with a ball to reduce motion friction.

[0014] Preferably, an air jet groove is provided on the inner side of the limiting ring below the partition, and an air intake pipe is fixedly inserted on the outer side of the limiting ring below the partition.

[0015] Preferably, the blow molding machine body is internally equipped with a mold locking mechanism. The mold locking mechanism includes a corrugated bladder disposed on the top of the right mounting bracket. The mold locking mechanism also includes a small plate fixed to the outside of the right first rack. The front ends of both molds are fixedly connected to a limiting plate. The left limiting plate has a slot. The right limiting plate is fixedly inserted with a locking rod. An expansion bladder is fixedly connected to the outside of the locking rod. A pipe is fixedly inserted between the corrugated bladder and the right limiting plate.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. Through the action of the motion components, the mold can be rotated at a certain angle when the mold is opened, so that the two molds are far apart. When the mold is opened by rotation, the surface contact can be instantly changed into line contact, which greatly reduces the contact area. This helps to reduce the large friction and vacuum adsorption caused by the huge contact area between the product and the cavity when the mold is opened, thereby reducing the scratches or stress whitening on the product surface and improving the quality of the produced products. 2. The slide bar moves the cutting blade towards the center of the cutting ring. At this time, the cutting blade can contact the blank. As the second rack and the second gear move relative to each other, the meshing action of the second rack and the second gear causes the cutting ring to rotate with the cutting blade to cut the excess blank and separate the blank from the product.

[0017] 3. Gas is introduced through the air inlet pipe, which facilitates the entry of high-pressure gas into the inner side of the limiting ring located below the partition plate. Gas is also injected into the gap from the jet channel, which helps to break the vacuum between the mold and the product, thereby further facilitating mold demolding, reducing damage to the demolded product, and further improving product quality. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is an overall structural view of the present invention; Figure 2 This is a schematic diagram of the mold part of the present invention; Figure 3 This is a rear view structural diagram of the mold part of the present invention; Figure 4 This is a partial structural diagram of the mold of the present invention during mold closing; Figure 5 This is a partial structural schematic diagram of the mounting bracket of the present invention; Figure 6 This is a partial structural diagram of the top position of the mounting bracket of the present invention; Figure 7 This is a partial structural schematic diagram of the second rack of the present invention; Figure 8 For the present invention Figure 7 Enlarged view of point A; Figure 9 This is a side sectional view of the connecting frame of the present invention; Figure 10 This is a partial structural schematic diagram of the first torsion spring of the present invention; Figure 11 This is a schematic diagram of a half-section of the limiting ring of the present invention; Figure 12 For the present invention Figure 11 Enlarged view of point B; Figure 13 This is a partial structural schematic diagram of the mold-locking mechanism of the present invention.

[0020] Explanation of reference numerals in the attached figures: 1. Blow molding machine body; 2. Mold; 3. Motion assembly; 31. Crossbar; 32. Motion frame; 33. Mounting bracket; 34. Spring; 35. Rotating shaft; 36. First torsion spring; 37. First rack; 38. First gear; 39. Drive unit; 391. Motor; 392. Double-acting lead screw; 4. Cutting assembly; 41. Connecting frame; 42. Restricting ring; 43. Cutting ring; 44. Cutting blade; 45. Second rack; 46. Second gear; 5. Feed assembly; 51. Rotating frame; 52. Groove; 5 3. Extrusion bar; 54. Extrusion plate; 55. Medium bladder; 56. Small tube; 57. Partition plate; 58. First elastic membrane; 59. Slide rod; 510. Second elastic membrane; 511. Extrusion ring; 512. Limiting frame; 513. Push rod; 514. Ball; 515. Third elastic membrane; 516. Second torsion spring; 6. Air jet groove; 7. Air inlet pipe; 8. Mold clamping mechanism; 81. Corrugated bladder; 82. Small plate; 83. Limiting plate; 84. Slot; 85. Locking rod; 86. Expansion bladder; 87. Pipe. Detailed Implementation

[0021] 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 some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Example 1: Please refer to Figures 1 to 12 The present invention provides a technical solution: an electric blow molding machine mold opening and closing mechanism, including a blow molding machine body 1. The blow molding machine is a mature existing technology, and its working principle will not be described in detail. The blow molding machine body 1 is equipped with a mold 2. There are two molds 2. When the two molds 2 are closed, blow molding can be performed. After the processing is completed, the blow-molded workpiece can be taken out by moving the two molds 2 away from the mold.

[0023] The mold opening and closing mechanism also includes a motion component 3 disposed inside the blow molding machine body 1. The motion component 3 is used to control the opening and closing of the mold 2. The motion component 3 includes a crossbar 31 fixedly connected inside the blow molding machine body 1. Motion frames 32 are slidably connected to both sides of the top of the crossbar 31. Mounting frames 33 are slidably connected to the side of the two motion frames 32 that are close to each other. A spring 34 is fixedly connected between the mounting frame 33 and the motion frame 32. A rotating shaft 35 is rotatably connected to both the top and bottom ends of the mounting frame 33. The rotating shaft 35 rotates with the mold 2, and a first torsion spring 36 is fixed between the rotating shaft 35 and the mold 2. The top of the two motion frames 32 are... A first rack 37 is fixedly attached, and a first gear 38 is fixedly connected to the outer wall of the upper rotating shaft 35. The first gear 38 meshes with the first rack 37. The inside of the crossbar 31 is configured with a drive unit 39 for driving the motion frame 32. The drive unit 39 includes a motor 391 fixedly connected to the inner side of the crossbar 31. The output shaft of the motor 391 is fixedly connected to a bidirectional lead screw 392. The end of the bidirectional lead screw 392 away from the motor 391 is rotatably connected to the inner side of the crossbar 31. The bottoms of the two motion frames 32 are respectively threaded to the outer walls of the two sides of the bidirectional lead screw 392. The motor 391 is a servo motor.

[0024] This invention uses a motor 391 to drive a bidirectional lead screw 392 to rotate, thereby realizing the opening and closing of the mold. Compared with traditional hydraulic power, it is cleaner and quieter, has a fast servo response speed, no oil pollution, and is adaptable to all environments. It can be used in pharmaceutical packaging workshops for pollution-free production and can also produce photoresist packaging. As a new technology, the application of servo technology to the device of this invention can more effectively improve the reliability and adaptability of the equipment.

[0025] By adopting the above technical solution, under the action of the first torsion spring 36, the two molds 2 can be tilted at an angle when not in mold closing. When mold closing is required, the output shaft of the motor 391 is rotated, which causes the bidirectional lead screw 392 to rotate, thereby causing the two moving frames 32 to move towards each other, carrying the mounting frame 33 and the mold 2. When the top positions of the two mounting frames 33 are in contact and can no longer move, the output shaft of the motor 391 continues to rotate, causing the moving frame 32 to continue moving. At this time, the moving frame 32 and the mounting frame 33 move relative to each other, and the spring 34 is compressed. Due to the relative movement of the moving frame 32 and the mounting frame 33, the first rack 37 and the first gear 38 move relative to each other. Under the action of the meshing of the first gear 38 and the first rack 37, the rotating shaft 35 can rotate the mold 2 against the torque of the first torsion spring 36, so that the mold 2 rotates and closes.

[0026] It should be noted that the rear ends of the two molds 2 are rounded to prevent them from interfering with the rotation process. When the tops of the two mounting brackets 33 are in contact, the rounded ends of the rear ends of the two molds 2 are in contact.

[0027] When mold opening is required, the output shaft of motor 391 drives the bidirectional lead screw 392 to rotate in the opposite direction to the previous one, which can make the two moving frames 32 move with the mounting frame 33 and the mold 2 in a direction away from each other. At the beginning, due to the elastic force of spring 34, the top positions of the two mounting frames 33 are close together in the initial stage. During this process, the moving frame 32 and the mounting frame 33 move relative to each other.

[0028] When the top positions of the two mounting brackets 33 are in contact and can no longer move, the output shaft of the motor 391 drives the bidirectional lead screw 392 to continue rotating, which allows the moving bracket 32 ​​to continue moving. At this time, there is relative movement between the moving bracket 32 ​​and the mounting bracket 33, and relative movement between the first rack 37 and the first gear 38, which causes the rotating shaft 35 to rotate with the mold 2. Subsequently, as the output shaft of the motor 391 continues to rotate, the two molds 2 can continue to move away from each other, making it easier to remove the blow-molded product.

[0029] This design allows the mold 2 to be rotated at a certain angle during mold opening, so that the two molds 2 are far apart. When the mold is rotated to open, the surface contact can be instantly changed to line contact, which greatly reduces the contact area. This helps to reduce the large friction and vacuum adsorption forces caused by the huge contact area between the product and the cavity during mold opening, thereby reducing scratches or stress whitening on the product surface and improving the quality of the produced products.

[0030] It should be noted that when the molds are closed, after the two molds 2 rotate and fit together, they continue to rotate through the output shaft of the motor 391, which drives the bidirectional lead screw 392 to rotate. At this time, the first torsion spring 36 will continue to twist and deform to ensure the fitting effect of the two molds 2.

[0031] The first gear 38 and the first rack 37 on both sides are staggered. This design ensures that there is no motion interference between the first racks 37 on both sides.

[0032] The mold 2 is externally equipped with a cutting assembly 4 for cutting the molded parts. The cutting assembly 4 includes a connecting frame 41 fixedly connected to the rear end of the crossbar 31. A limiting ring 42 is fixedly inserted into the top front end of the connecting frame 41. A cutting ring 43 is rotatably connected to the top position of the limiting ring 42. A cutting blade 44 is arranged inside the cutting ring 43. The limiting ring 42 is located above the mold 2. A second rack 45 is fixedly connected to the moving frame 32 on the left side. A second gear 46 is fixedly connected to the outer side of the cutting ring 43. The second gear 46 meshes with the second rack 45. The second rack 45 is slidably connected to the connecting frame 41. An infeed assembly 5 is arranged above the mold 2. The infeed assembly 5 includes a groove 52 opened at the rear end of the second rack 45. A rotating frame 51 is fixedly connected inside the groove 52. An extrusion strip 53 is rotatably connected to the outer wall of the rotating frame 51. A second torsion spring 516 is fixed between the extrusion strip 53 and the rotating frame 51. The right side of the extrusion strip 53 is in contact with the inner side of the groove 52. The top of the connecting frame 41 is located at the... The rear end of the rack 45 is slidably connected to a compression plate 54. A media bladder 55 is disposed at the rear end of the compression plate 54. A small tube 56 is inserted into the bottom of the media bladder 55, and the bottom of the small tube 56 is inserted into the interior of the connecting frame 41. The feed assembly 5 also includes a partition 57 fixed inside a limiting ring 42. The interior of the connecting frame 41 communicates with the inner side of the limiting ring 42 above the partition 57. The feed assembly 5 also includes a first elastic membrane 58 fixed inside a cutting ring 43. A sliding... The end of the rod 59 and the slide rod 59 are fixedly connected to the cutting blade 44. The slide rod 59 is slidably connected to the inside of the cutting ring 43. The feed assembly 5 also includes a second elastic membrane 510 fixed inside the cutting ring 43. A compression ring 511 is disposed at the bottom of the second elastic membrane 510. The compression ring 511 is slidably connected to the cutting ring 43. A limit frame 512 is fixedly connected to the bottom of the cutting ring 43. A push rod 513 slides inside the limit frame 512. A third elastic membrane 515 is fixed at the bottom of the push rod 513.

[0033] It should be noted that the torque of the second torsion spring 516 is relatively small, less than the elastic force of the medium capsule 55 itself, the elastic force of the second elastic membrane 510 is less than the elastic force of the first elastic membrane 58, and the elastic force of the medium capsule 55 is less than the elastic force of the third elastic membrane 515. In the initial state, the first elastic membrane 58 and the third elastic membrane 515 are in a non-expanded state, while the second elastic membrane 510 is in an expanded state.

[0034] By adopting the above technical solution, when the two molds 2 are closed, the two moving frames 32 move closer to each other, so that the moving frame 32 on the left moves with the second rack 45. In this way, the second rack 45 and the second gear 46 generate relative motion, thereby causing the cutting ring 43 to rotate. During this process, since the first elastic membrane 58 is in a non-expanded state, when the second rack 45 moves to the right with the extrusion strip 53, the extrusion strip 53 is deflected by the extrusion plate 54. The cutting blade 44 is hidden inside the cutting ring 43. At this time, the cutting ring 43 rotates with the cutting blade 44 without cutting the produced plastic preform.

[0035] It should be noted that, during mold closing, after the two molds 2 rotate and fit together, they continue to rotate via the output shaft of motor 391, driving the bidirectional lead screw 392. At this time, the first torsion spring 36 continues to twist and deform. Therefore, during the initial stage when the two moving frames 32 move away from each other during mold opening, the two molds 2 remain in the closed state. At this time, the left moving frame 32 moves with the second rack 45. When the second rack 45 moves the extrusion bar 53 to the left, and the extrusion bar 53 contacts the extrusion plate 54, because the right side of the extrusion bar 53 is fitted with the inner side of the groove 52, the extrusion bar 53 cannot deflect. At this time, the extrusion bar 53 extrudes the extrusion plate 54, and the extrusion plate 54 moves backward to extrude the medium bladder 55. The medium inside the medium bladder 55 enters the interior of the connecting frame 41 through the small tube 56 and enters the inner side of the limiting ring 42, located above the partition plate 57. The pressure of the medium above 7 increases, causing the third elastic membrane 515 to expand. This causes the push rod 513 to move upward and squeeze the extrusion ring 511. The extrusion ring 511 moves upward and squeezes the second elastic membrane 510, increasing the pressure inside the cutting ring 43. The first elastic membrane 58 expands. During this process, the slide rod 59 carries the cutting blade 44 to the center of the cutting ring 43. At this time, the cutting blade 44 can contact the blank. As the second rack 45 and the second gear 46 move relative to each other, the meshing action of the second rack 45 and the second gear 46 causes the cutting ring 43 to rotate with the cutting blade 44 to cut the excess blank and separate the blank from the product.

[0036] It should be noted that the design of the limiting ring 42 can limit the position of the top of the product, so that the product is kept in the middle position. When the two molds 2 are far apart, it is easy for the product to be demolded and separated from the mold 2.

[0037] The top of the push rod 513 is equipped with a ball 514 to reduce motion friction. The design of the ball 514 is beneficial to the friction between the push rod 513 and the compression ring 511 during relative movement.

[0038] An air jet groove 6 is provided on the inner side of the limiting ring 42 below the partition 57. An air inlet pipe 7 is fixedly inserted on the outer side of the limiting ring 42 below the partition 57. A fourth elastic membrane is fixed on the inner side of the limiting ring 42 above the partition 57. When the medium bladder 55 is squeezed, the fourth elastic membrane will also expand.

[0039] By adopting the above technical solution, when the fourth elastic film expands, it squeezes the top of the product, creating a small gap between the top of the product and the mold 2. This, combined with the introduction of gas from the air inlet pipe 7, facilitates the entry of high-pressure gas into the inner side of the limiting ring 42 located below the partition plate 57. Gas is then injected into the gap from the air jet groove 6, which helps to break the vacuum between the mold 2 and the product, thereby further facilitating demolding of the mold 2, reducing damage to the demolded product, and further improving the quality of the product.

[0040] Example 2: The technical solution of this example differs from that of Example 1 in that: Figures 1 to 6 and Figure 13 The blow molding machine body 1 is internally equipped with a mold clamping mechanism 8. The mold clamping mechanism 8 includes a corrugated bladder 81 located on the top of the right mounting bracket 33. The mold clamping mechanism 8 also includes a small plate 82 fixed to the outside of the right first rack 37. The front ends of the two molds 2 are fixedly connected to a limiting plate 83. The left limiting plate 83 has a slot 84. The right limiting plate 83 is fixedly inserted with a locking rod 85. An expansion bladder 86 is fixedly connected to the outside of the locking rod 85. A pipe 87 is fixedly inserted between the corrugated bladder 81 and the right limiting plate 83. One section of the pipe 87 is made of flexible hose material to avoid affecting the rotation of the mold 2.

[0041] By adopting the above technical solution, when the mold is closed, the expansion bladder 86 does not expand, which facilitates the insertion of the clamping rod 85 into the groove 84. When the two molds 2 rotate and close, the small plate 82 just contacts the corrugated bladder 81. Then the two moving frames 32 continue to move closer to each other. The small plate 82 squeezes the corrugated bladder 81, so that the medium inside the corrugated bladder 81 enters the right-side limiting plate 83 through the pipe 87 and enters the clamping rod 85, causing the expansion bladder 86 to expand. When the expansion bladder 86 expands, it will squeeze the left-side limiting plate 83, further ensuring the tight fit between the two molds 2.

[0042] When the mold is opened, since the two moving frames 32 are moving away from each other in the initial stage, the two molds 2 are still in the closed state. Therefore, the small plate 82 gradually stops squeezing the corrugated bladder 81. When the two molds 2 rotate to open the mold, the expansion bladder 86 is not squeezed, which makes it easier for the clamping rod 85 to leave the clamping slot 84.

[0043] Working principle: The output shaft of motor 391 rotates, causing the bidirectional lead screw 392 to rotate. This causes the two moving frames 32, along with the mounting frame 33 and the mold 2, to move towards each other. When the tops of the two mounting frames 33 come into contact and can no longer move, the output shaft of motor 391 continues to rotate, causing the bidirectional lead screw 392 to continue moving. At this time, the moving frames 32 and the mounting frames 33 move relative to each other, and the spring 34 is compressed. Due to the relative movement of the moving frames 32 and the mounting frames 33, the first rack 37 and the first gear 38 move relative to each other. Under the action of the meshing of the first gear 38 and the first rack 37, the rotating shaft 35 can rotate the mold 2 against the torque of the first torsion spring 36, so that the mold 2 rotates and moves closer to close.

[0044] The output shaft of motor 391 drives the bidirectional lead screw 392 to rotate in the opposite direction, causing the two moving frames 32, along with the mounting frame 33 and mold 2, to move away from each other. Initially, due to the elastic force of spring 34, the top positions of the two mounting frames 33 are brought close together. During this process, there is relative movement between the moving frames 32 and the mounting frames 33. When the top positions of the two mounting frames 33 come into contact and cannot continue to move, the output shaft of motor 391 drives the bidirectional lead screw 392 to continue rotating, allowing the moving frames 32 to continue moving. At this point, the moving frames 32 and the mounting frames 33 move away from each other. The relative movement between the frames 33 and the relative movement between the first rack 37 and the first gear 38 cause the rotating shaft 35 to rotate with the mold 2. Subsequently, as the output shaft of the motor 391 continues to rotate, the two molds 2 can continue to move away from each other, making it easier to remove the blow-molded product. When opening the mold, the mold 2 can be rotated at a certain angle first, and then the two molds 2 can be moved away from each other. When the mold is opened by rotation, the surface contact can be instantly changed to line contact, which greatly reduces the contact area. This helps to reduce the large friction and vacuum suction force generated by the huge contact surface between the product and the cavity when the mold is opened.

[0045] After the two molds 2 rotate and fit together, they continue to rotate via the output shaft of motor 391, driving the bidirectional lead screw 392 to rotate. At this time, the first torsion spring 36 will continue to twist and deform. Therefore, when the mold opens, in the initial stage when the two moving frames 32 move away from each other, the two molds 2 still remain in the mold-closed state. At this time, the left moving frame 32 moves with the second rack 45. When the second rack 45 moves the extrusion bar 53 to the left, the extrusion bar 53 contacts the extrusion plate 54. Because the right side of the extrusion bar 53 is in contact with the inner side of the groove 52, the extrusion bar 53 cannot deflect. At this time, the extrusion bar 53 extrudes the extrusion plate 54. The extrusion plate 54 moves backward and extrudes the medium bladder 55. The medium inside the medium bladder 55 enters the interior of the connecting frame 41 through the small tube 56 and enters the inner side of the limiting ring 42 above the partition plate 57. The medium pressure inside the limiting ring 42 above the partition plate 57 increases, and the third elastic membrane 515 expands, thereby causing the push rod 51 to... The upward movement of the extrusion ring 511 compresses the second elastic membrane 510, increasing the pressure inside the cutting ring 43 and causing the first elastic membrane 58 to expand. During this process, the slide bar 59 moves the cutting blade 44 towards the center of the cutting ring 43, where it can contact the blank. As the second rack 45 and the second gear 46 move relative to each other, the meshing of the rack 45 and the gear 46 causes the cutting ring 43 to rotate with the cutting blade 44, cutting off excess blank and separating the blank from the product. Gas is then injected into the gap from the air jet 6, which helps to break the vacuum between the mold 2 and the product, further facilitating mold 2 demolding, reducing damage to the demolded product, and further improving product quality.

[0046] When the mold is closed, the expansion bladder 86 does not expand, making it easy for the clamping rod 85 to insert into the groove 84. When the two molds 2 rotate and close, the small plate 82 just contacts the corrugated bladder 81. Then the two moving frames 32 continue to move closer to each other. The small plate 82 squeezes the corrugated bladder 81, causing the medium inside the corrugated bladder 81 to enter the right-side limiting plate 83 through the pipe 87 and into the clamping rod 85, causing the expansion bladder 86 to expand. When the expansion bladder 86 expands, it will squeeze the left-side limiting plate 83, further ensuring the tight fit between the two molds 2.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An electric blow molding machine mold opening and closing mechanism, comprising a blow molding machine body (1), the inside of the blow molding machine body (1) is configured with a mold (2), the mold (2) is configured with two, when the two molds (2) are closed, blow molding processing can be carried out, characterized in that, The mold opening and closing mechanism further comprises: The motion assembly (3) is arranged in the interior of the blow molding machine body (1), and the motion assembly (3) comprises a crossbar (31) fixedly connected to the interior of the blow molding machine body (1), both sides of the top of the crossbar (31) are slidably connected with a motion frame (32), both sides of the motion frame (32) close to each other are slidably connected with a mounting frame (33), the mounting frame (33) and the motion frame (32) are fixedly connected with a spring (34), both ends of the top and bottom of the mounting frame (33) are rotatably connected with a rotating shaft (35), the rotating shaft (35) is rotatable with the mold (2), and the rotating shaft (35) and the mold (2) are fixedly connected with a first torsional spring (36), the top of each of the two motion frames (32) is fixedly connected with a first rack (37), the outer wall of the rotating shaft (35) on the upper side is fixedly connected with a first gear (38), the first gear (38) is engaged with the first rack (37), and the interior of the crossbar (31) is arranged with a driving part (39) for driving the motion frame (32).

2. The electric blow molding machine mold opening and closing mechanism according to claim 1, characterized by: The driving part (39) comprises a motor (391) fixedly connected to the inner side of the crossbar (31), the output shaft of the motor (391) is fixedly connected with a bidirectional screw rod (392), one end, away from the motor (391), of the bidirectional screw rod (392) is rotatably connected with the inner side of the crossbar (31), and the bottom of each of the two motion frames (32) is threadedly connected with the outer wall of each side of the bidirectional screw rod (392).

3. The electric blow molding machine mold opening and closing mechanism according to claim 1, characterized by: The first gears (38) on both sides are arranged in a staggered manner with the first racks (37).

4. The electric blow molding machine mold opening and closing mechanism according to claim 1, characterized by: The mold (2) is externally arranged with a cutting assembly (4) for cutting the molded part, the cutting assembly (4) comprises a connecting frame (41) fixedly connected to the rear end of the crossbar (31), the top of the connecting frame (41) is fixedly inserted with a limiting ring (42), the top of the limiting ring (42) is rotatably connected with a cutting ring (43), the inner side of the cutting ring (43) is arranged with a cutting knife (44), and the limiting ring (42) is located above the mold (2).

5. The electric blow molding machine mold opening and closing mechanism according to claim 4, characterized by: The motion frame (32) on the left side is fixedly connected with a second rack (45), the outer side of the cutting ring (43) is fixedly connected with a second gear (46), the second gear (46) is engaged with the second rack (45), and the second rack (45) is slidably connected with the connecting frame (41).

6. The electric blow molding machine mold opening and closing mechanism according to claim 1, characterized by: The mold (2) is arranged above with an infeed assembly (5), the infeed assembly (5) comprises a groove (52) formed in the rear end of the second rack (45), the interior of the groove (52) is fixedly connected with a rotating frame (51), the outer wall of the rotating frame (51) is rotatably connected with a pressing strip (53), the right side of the pressing strip (53) is attached to the inner side of the groove (52), the top of the connecting frame (41) is slidably connected with a pressing plate (54) at the rear end of the second rack (45), the rear end of the pressing plate (54) is arranged with a medium bag (55), the bottom of the medium bag (55) is inserted with a small tube (56), the bottom of the small tube (56) is inserted into the interior of the connecting frame (41), and the pressing strip (53) and the rotating frame (51) are fixedly connected with a second torsional spring (516).

7. The electric blow molding machine mold opening and closing mechanism according to claim 6, characterized by: The feed assembly (5) also includes a partition (57) fixed inside the limiting ring (42), and the inside of the connecting frame (41) is connected to the inside of the limiting ring (42) above the partition (57). The feed assembly (5) also includes a first elastic membrane (58) fixed inside the cutting ring (43), and a slide rod (59) is fixedly connected inside the first elastic membrane (58). The end of the slide rod (59) is fixedly connected to the cutting blade (44). The feed assembly (5) also includes a second elastic membrane (510) fixed inside the cutting ring (43). A compression ring (511) is arranged at the bottom of the second elastic membrane (510). The compression ring (511) is slidably connected to the cutting ring (43). A limit frame (512) is fixedly connected at the bottom of the cutting ring (43). A push rod (513) slides inside the limit frame (512). A third elastic membrane (515) is fixed at the bottom of the push rod (513).

8. The electric blow molding machine mold opening and closing mechanism according to claim 7, characterized by: The top of the push rod (513) is equipped with a ball (514) to reduce motion friction.

9. The electric blow molding machine mold opening and closing mechanism according to claim 8, characterized by: An air jet groove (6) is provided on the inner side of the limiting ring (42) below the partition (57), and an air intake pipe (7) is fixedly inserted on the outer side of the limiting ring (42) below the partition (57).

10. The electric blow molding machine mold opening and closing mechanism according to claim 1, characterized by: The blow molding machine body (1) is internally equipped with a mold locking mechanism (8). The mold locking mechanism (8) includes a corrugated bladder (81) located on the top of the right mounting bracket (33). The mold locking mechanism (8) also includes a small plate (82) fixed outside the right first rack (37). The front ends of the two molds (2) are fixedly connected to a limiting plate (83). The left limiting plate (83) has a slot (84). The right limiting plate (83) is fixedly inserted with a locking rod (85). The outside of the locking rod (85) is fixedly connected with an expansion bladder (86). A pipe (87) is fixedly inserted between the corrugated bladder (81) and the right limiting plate (83).

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