Mold opening and closing device for blow molding machine

Abstract

The invention relates to the field of blow molding machines, and discloses a mold opening and closing device for a blow molding machine, the mold opening and closing device comprises two fixing seats, the two fixing seats are fixedly connected through a fixing frame, two mold opening and closing structures are arranged between the two fixing seats, and a first lifting supporting structure is arranged on the fixing frame; the intermittent opening and closing structure is used for automatically and intermittently driving the upper mold plate and the lower mold plate of the mold opening and closing structure to open molds in sequence, and when the mold opening of the lower mold plate is not thorough, the supporting block of the first supporting structure moves upwards to be supported on a product to support the product, so that the problem of deformation caused by direct falling and blanking of the product is avoided; and along with continuous mold opening of the lower mold plate, the blocking block of the second lifting supporting structure moves upwards to block the product on the supporting block, so that after the upper mold plate is completely opened, the problem that the product falls off can be avoided, the blow-molded product is automatically received, the structure is simple, and the function is practical.

Description

Technical Field

[0001] This invention relates to the technical field of blow molding machines, and in particular to a mold opening and closing device for blow molding machines. Background Technology

[0002] A blow molding machine is an industrial equipment used to manufacture hollow plastic products. It mainly blows molten plastic preforms into hollow containers or products of various shapes. The blow molding machine's mold is a type of mold suitable for plastic molding processing. It consists of two molds. When the mold is closed, the two molds fit tightly together. After the finished product is formed, the part can be removed by opening the mold.

[0003] Patent CN118810009A discloses a mold opening and closing device for a centrally controlled blow molding machine. It incorporates hydraulic cylinders, with two cylinders independently controlling a mold plate on a mold plate frame. This allows for adjustment of the mold closing force when blow molding different plastics. Limiting rods and guide rods are also included. The limiting rods restrict the movement of the mold plate frame, ensuring accurate movement and increasing the mold closing force in conjunction with the hydraulic cylinders. The guide rods ensure the mold plate plates are aligned, improving the accuracy of the mold closing position and preventing mold plate misalignment. Furthermore, a lifting rod and a support plate are incorporated. The lifting rod raises the support plate, adjusting its position, and the support plate supports the plastic product after mold opening, preventing tensile deformation due to the product's own weight.

[0004] However, after molding, due to the gap between the support plate and the blow molding tank, the molded product falls directly onto the support plate after the two template frames are opened. This not only makes the product prone to deformation under stress, but also makes it easy for it to roll off the support plate. Therefore, there are areas for improvement. Summary of the Invention

[0005] To address the problems mentioned in the background section, the present invention provides a mold opening and closing device for a blow molding machine.

[0006] The present invention provides a mold opening and closing device for a blow molding machine, which adopts the following technical solution:

[0007] A mold opening and closing device for a blow molding machine includes a fixed base, two fixed bases are fixedly connected by a fixed frame, two sets of mold opening and closing structures are arranged between the two fixed bases, and a first lifting support structure is arranged on the fixed frame;

[0008] The two sets of opening and closing mold structures include two first guide rods connected above the two fixed seats, two second guide rods connected below the two fixed seats, two upper mold frames movably sleeved on the two first guide rods, upper templates installed on the side of the two upper mold frames that are close to each other, and upper mold cavities provided in the upper templates; two lower mold frames movably sleeved on the two second guide rods, lower templates installed on the side of the two lower mold frames that are close to each other; a sealing structure provided between the upper templates and the lower templates; a lower mold cavity opened on the lower templates; and an intermittent opening and closing structure provided between the two fixed seats.

[0009] Preferably, the intermittent opening and closing structure includes a hydraulic cylinder mounted on two fixed seats. One end of the output shaft of the hydraulic cylinder is connected to the lower mold frame. An L-shaped plate is connected to the side of the lower mold frame away from the lower template. A U-shaped plate is provided at the top of the L-shaped plate. A square frame is connected to the side of the upper mold frame away from the upper template. One side of the U-shaped plate abuts against the inner wall of one side of the square frame, and the inner wall of the other side of the U-shaped plate abuts against the outer side of the other side of the square frame.

[0010] Preferably, the first lifting support structure includes a mounting column disposed within a fixed frame. The mounting column is disposed on the fixed frame via a movable structure. A mounting plate is mounted on the top of the mounting column. A first lifting bar moves through both the front and rear sides of the mounting plate. A support block is mounted on the top of the first lifting bar. A second lifting support structure is disposed on the mounting plate.

[0011] Preferably, the second lifting support structure includes a second lifting bar that moves through the left and right sides of the mounting plate, a blocking block is installed at the top of the second lifting bar, and an automatic lifting structure is provided between the first and second lifting bars and the lower mold frame.

[0012] Preferably, the automatic lifting structure includes a first horizontal plate connected to the first lifting bar, the first horizontal plate having a first driving groove, a second horizontal plate connected to the second lifting bar, the second horizontal plate having a second driving groove, an L-shaped strip connected to one side of the lower mold frame, a through rod connected to the L-shaped strip, the through rod movably passing through the first driving groove and the second driving groove.

[0013] Preferably, the movable structure includes a base plate connected to a fixed frame, a guide groove is formed on the base plate, a movable block is slidably disposed in the guide groove, the movable block is connected to the bottom end of the mounting column, and a driving structure is provided between the movable block and one of the lower mold frames.

[0014] Preferably, the driving structure includes a moving plate connected to the right side of the moving block, a third driving groove is formed on the moving plate, and a vertical rod is connected to the lower mold frame below, with the bottom end of the vertical rod movably passing through the third driving groove.

[0015] Preferably, the sealing structure includes multiple grooves equally spaced on one side of the upper template, with a sealing gasket provided on the groove wall, and multiple protrusions equally spaced on the inner wall of one side of the lower template, with the protrusions pressing against the sealing gasket.

[0016] In summary, the present invention has the following beneficial technical effects:

[0017] 1. This invention, by setting up an opening and closing mold structure, an intermittent opening and closing structure, a first lifting support structure, and a second lifting support structure, utilizes the intermittent opening and closing structure to automatically and intermittently drive the upper and lower mold plates of the opening and closing mold structure to open the mold sequentially. When the lower mold plate is not fully opened, the support block of the first support structure moves upward to support the product, preventing the product from falling directly and causing deformation. As the lower mold plate continues to open, the blocking block of the second lifting support structure moves upward to block the product on the support block. In this way, after the upper mold plate is fully opened, the problem of the product falling can be avoided, thus automatically receiving the blow-molded product. The structure is simple and the function is practical.

[0018] 2. By setting up an automatic lifting structure, the mold opening and closing structure can automatically move the support block of the first lifting support structure and the blocking block of the second lifting support structure upward to receive the product during the mold opening process, making the operation more labor-saving and convenient, and improving work efficiency.

[0019] 3. By setting up a moving structure and a driving structure, the present invention automatically pushes the received product out from between two fixed seats during the mold opening process, thereby facilitating the handling of the work. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of a mold opening and closing device for a blow molding machine according to an embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram of the structure of the upper mold frame and the lower mold frame in an embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of the structure of the lower mold frame in an embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the structure of the upper mold frame in an embodiment of the present invention;

[0024] Figure 5 This is a schematic diagram of the structure at the fixed frame in an embodiment of the present invention;

[0025] Figure 6 This is an embodiment of the present invention. Figure 5 Enlarged view of the structure at point A.

[0026] Explanation of reference numerals in the attached drawings: 1. Fixed base; 2. Fixed frame; 3. First guide rod; 4. Upper mold frame; 5. Upper template; 6. Lower mold frame; 7. Hydraulic cylinder; 8. Second guide rod; 9. Lower template; 10. Upper mold cavity; 11. Lower mold cavity; 12. L-shaped plate; 13. U-shaped plate; 14. Square frame; 15. Mounting column; 16. Mounting plate; 17. First lifting bar; 18. Support block; 19. Second lifting bar; 20. Barrier block; 21. First horizontal plate; 22. First driving groove; 23. Second horizontal plate; 24. Second driving groove; 25. L-shaped bar; 26. Through rod; 27. Base plate; 28. Guide groove; 29. ​​Moving block; 30. Sealing gasket; 31. Moving plate; 32. Third driving groove; 33. Vertical rod; 34. Protruding strip; 35. Groove. Detailed Implementation

[0027] The following is in conjunction with the appendix Figures 1-6 The present invention will be described in further detail below.

[0028] This invention discloses a mold opening and closing device for a blow molding machine. (Refer to...) Figures 1-6 A mold opening and closing device for a blow molding machine includes a fixed base 1, two fixed bases 1 are fixedly connected by a fixed frame 2, two sets of mold opening and closing structures are provided between the two fixed bases 1, and a first lifting support structure is provided on the fixed frame 2.

[0029] The two sets of opening and closing mold structures include two first guide rods 3 connected above the two fixed seats 1, two second guide rods 8 connected below the two fixed seats 1, two upper mold frames 4 movably sleeved on the two first guide rods 3, upper templates 5 installed on the side of the two upper mold frames 4 that are close to each other, and an upper mold cavity 10 provided in the upper template 5; two lower mold frames 6 movably sleeved on the two second guide rods 8, lower templates 9 installed on the side of the two lower mold frames 6 that are close to each other; a sealing structure is provided between the upper template 5 and the lower template 9; a lower mold cavity 11 is opened on the lower template 9; and an intermittent opening and closing structure is provided between the two fixed seats 1.

[0030] The intermittent opening and closing structure includes a hydraulic cylinder 7 installed on two fixed seats 1. One end of the output shaft of the hydraulic cylinder 7 is connected to the lower mold frame 6. An L-shaped plate 12 is connected to the side of the lower mold frame 6 away from the lower template 9. A U-shaped plate 13 is set at the top of the L-shaped plate 12. A square frame 14 is connected to the side of the upper mold frame 4 away from the upper template 5. One side of the U-shaped plate 13 abuts against the inner wall of one side of the square frame 14, and the other inner wall of the U-shaped plate 13 abuts against the outer side of the other side of the square frame 14.

[0031] The sealing structure includes multiple grooves 35 evenly spaced on one side of the upper mold plate 5, with sealing gaskets 30 installed on the groove walls. Multiple protrusions 34 are evenly spaced on the inner wall of one side of the lower mold plate 9, pressing against the sealing gaskets 30. When the mold is closed, the hydraulic cylinder 7 is activated, causing the two lower mold frames 6 to move towards the center on the second guide rod 8. During this movement, the lower mold frames 6 move the U-shaped plate 13 at the top of the L-shaped plate 12, pressing it against the square frame 14. The U-shaped plate 13 pushes the square frame 14, thereby moving the upper mold frame 4, which in turn moves the two sets of lower mold plates 9 and the upper mold plate 9. 5. The upper and lower mold plates are joined together, and the upper protrusion 34 of the lower mold plate 9 presses against the sealing gasket 30 in the groove 35 to ensure the sealing between the lower mold plate 9 and the upper mold plate 5. Then, the blow molding of the product can be carried out in the upper mold cavity 10 and the lower mold cavity 11. After the product is formed, the hydraulic cylinder 7 drives the two lower mold frames 6 to move away from each other to automatically open the two lower mold plates 9. As the lower mold frames 6 continue to move, they drive the U-shaped plate 13 to push into the square frame 14, thereby opening the upper mold plate 5. This realizes the intermittent opening of the lower mold plate 9 and the upper mold plate 5.

[0032] See Figures 1-6 The first lifting support structure includes a mounting column 15 set in the fixed frame 2. The mounting column 15 is set on the fixed frame 2 through a movable structure. A mounting plate 16 is installed at the top of the mounting column 15. The first lifting bar 17 moves through the front and rear sides of the mounting plate 16. A support block 18 is installed at the top of the first lifting bar 17. A second lifting support structure is set on the mounting plate 16.

[0033] The second lifting support structure includes a second lifting bar 19 that moves through the left and right sides of the mounting plate 16, a shielding block 20 is installed at the top of the second lifting bar 19, and an automatic lifting structure is provided between the first lifting bar 17, the second lifting bar 19 and the lower mold frame 6.

[0034] The automatic lifting structure includes a first horizontal plate 21 connected to the first lifting bar 17, with a first driving groove 22 on the first horizontal plate 21. A second horizontal plate 23 is connected to the second lifting bar 19, with a second driving groove 24 on the second horizontal plate 23. An L-shaped bar 25 is connected to one side of the lower mold frame 6, with a through rod 26 connected to the L-shaped bar 25. The through rod 26 moves through the first driving groove 22 and the second driving groove 24. During the opening process of the lower mold plate 9, the through rod 26 on the L-shaped bar 25 slides in the first driving groove 22 and the second driving groove 24 respectively. When the two lower mold plates 9 are not completely opened and the product is still supported in the lower mold plates 9, the through rod 26 presses against the wall of the first driving groove 22, pushing the first horizontal plate 21. The first lifting bar 17 is moved upward, and through the gap between the two lower templates 9, the support block 18 is moved upward to support the formed product. When the lower template 9 is fully opened and continues to move, the lower template 9 drives the through rod 26 to press the wall of the second driving groove 24, pushing the second horizontal plate 23 and the second lifting bar 19 to move upward as a whole, thereby moving the blocking block 20 upward to wrap around the product, thus blocking the product supported on the support block 18. Then, the lower template 9 continues to move, and through the push of the square frame 14 by the U-shaped plate 13, the upper template 5 is opened. In this way, after the upper template 5 and the lower template 9 are fully opened, they can automatically receive the formed product, reducing the problem of product deformation or even damage.

[0035] See Figure 1 , Figure 5 and Figure 6 The movable structure includes a base plate 27 connected to the fixed frame 2, a guide groove 28 is opened on the base plate 27, a movable block 29 is slidably arranged in the guide groove 28, the movable block 29 is connected to the bottom end of the mounting column 15, and a driving structure is provided between the movable block 29 and one of the lower mold frames 6.

[0036] The driving structure includes a moving plate 31 connected to the right side of the moving block 29. A third driving groove 32 is opened on the moving plate 31. A vertical rod 33 is connected to the lower mold frame 6. The bottom end of the vertical rod 33 moves through the third driving groove 32. After the upper mold plate 5 is fully opened and the product is received, as the lower mold frame 6 continues to move, the vertical rod 33 is driven to squeeze the groove wall of the third driving groove 32, pushing the moving plate 31 to move, thereby driving the moving block 29 to slide in the guide groove 28, and then bringing out the product received on the support block 18 in the fixed frame 2, making it more convenient to pick up the product.

[0037] The implementation principle of the mold opening and closing device for a blow molding machine according to an embodiment of the present invention is as follows: First, the hydraulic cylinder 7 is activated, which drives the two lower mold frames 6 to move towards the center on the second guide rod 8. During the movement of the lower mold frames 6, the U-shaped plate 13 at the top of the L-shaped plate 12 moves and adheres to the square frame 14. The U-shaped plate 13 pushes the square frame 14 to push the upper mold frame 4 to move, thereby driving the two sets of lower mold plates 9 and upper mold plates 5 to fit together. The protrusion 34 on the lower mold plate 9 abuts against the sealing gasket 30 in the groove 35. To ensure a tight seal between the lower mold plate 9 and the upper mold plate 5, blow molding of the product can then be performed in the upper mold cavity 10 and the lower mold cavity 11. After the product is formed, the hydraulic cylinder 7 drives the two lower mold frames 6 to move away from each other. During the opening process of the lower mold plate 9, the through rod 26 on the L-shaped strip 25 slides in the first driving groove 22 and the second driving groove 24 respectively. When the two lower mold plates 9 are not completely open and the product is still supported in the lower mold plate 9, the through rod 26 squeezes the wall of the first driving groove 22, pushing the first horizontal plate 21 to move the first lifting strip 17 upward. From the gap between the two lower mold plates 9, the support block 18 moves upward to support the formed product. When the lower mold plate 9 is fully open and continues to move, the lower mold plate 9 drives the through rod 26 to squeeze the wall of the second driving groove 24, pushing the second horizontal plate 23 and the second lifting strip 19 upward as a whole, thereby moving the blocking block 20 upward to wrap around the product, thus blocking the product supported on the support block 18. Then, the lower mold... Plate 9 continues to move, pushing the square frame 14 through U-shaped plate 13 to open the upper template 5. After the upper template 5 and lower template 9 are fully opened, they can automatically receive the formed product. Finally, the lower mold frame 6 continues to move, driving the vertical rod 33 to squeeze the wall of the third driving groove 32, pushing the moving plate 31 to move, thereby driving the moving block 29 to slide in the guide groove 28, and then bringing out the product received on the support block 18 in the fixed frame 2. After removing the product from the support block 18, the work is completed.

[0038] The above are all preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A mold opening and closing device for a blow molding machine, comprising a fixed base (1), characterized in that: The two fixed seats (1) are fixedly connected by a fixed frame (2), and two sets of opening and closing mold structures are provided between the two fixed seats (1). A first lifting support structure is provided on the fixed frame (2). The two sets of opening and closing mold structures include two first guide rods (3) connected above the two fixed seats (1), two second guide rods (8) connected below the two fixed seats (1), two upper mold frames (4) movably sleeved on the two first guide rods (3), upper templates (5) are installed on the side of the two upper mold frames (4) that are close to each other, and an upper mold cavity (10) is provided in the upper template (5). Two lower mold frames (6) movably sleeved on the two second guide rods (8), and lower templates (9) are installed on the side of the two lower mold frames (6) that are close to each other. A sealing structure is provided between the upper template (5) and the lower template (9), and a lower mold cavity (11) is opened on the lower template (9). An intermittent opening and closing structure is provided between the two fixed seats (1).

2. The mold opening and closing device for a blow molding machine according to claim 1, characterized in that: The intermittent opening and closing structure includes a hydraulic cylinder (7) installed on two fixed seats (1). One end of the output shaft of the hydraulic cylinder (7) is connected to the lower mold frame (6). An L-shaped plate (12) is connected to the side of the lower mold frame (6) away from the lower template (9). A U-shaped plate (13) is provided at the top of the L-shaped plate (12). A square frame (14) is connected to the side of the upper mold frame (4) away from the upper template (5). One side of the U-shaped plate (13) abuts against the inner wall of one side of the square frame (14), and the inner wall of the other side of the U-shaped plate (13) abuts against the outer side of the other side of the square frame (14).

3. The mold opening and closing device for a blow molding machine according to claim 1, characterized in that: The first lifting support structure includes an installation column (15) set in a fixed frame (2). The installation column (15) is set on the fixed frame (2) by a movable structure. An installation plate (16) is installed at the top of the installation column (15). The first lifting bar (17) moves through the front and rear sides of the installation plate (16). A support block (18) is installed at the top of the first lifting bar (17). A second lifting support structure is set on the installation plate (16).

4. The mold opening and closing device for a blow molding machine according to claim 3, characterized in that: The second lifting support structure includes a second lifting bar (19) that moves through the left and right sides of the mounting plate (16), a shielding block (20) is installed at the top of the second lifting bar (19), and an automatic lifting structure is provided between the first lifting bar (17) and the second lifting bar (19) and the lower mold frame (6).

5. The mold opening and closing device for a blow molding machine according to claim 4, characterized in that: The automatic lifting structure includes a first horizontal plate (21) connected to the first lifting bar (17), a first driving groove (22) is opened on the first horizontal plate (21), a second horizontal plate (23) is connected to the second lifting bar (19), a second driving groove (24) is opened on the second horizontal plate (23), an L-shaped bar (25) is connected to one side of the lower mold frame (6), a through rod (26) is connected to the L-shaped bar (25), and the through rod (26) moves through the first driving groove (22) and the second driving groove (24).

6. The mold opening and closing device for a blow molding machine according to claim 3, characterized in that: The movable structure includes a base plate (27) connected to a fixed frame (2), a guide groove (28) is provided on the base plate (27), a movable block (29) is slidably arranged in the guide groove (28), the movable block (29) is connected to the bottom end of the mounting column (15), and a driving structure is provided between the movable block (29) and one of the lower mold frames (6).

7. A mold opening and closing device for a blow molding machine according to claim 6, characterized in that: The driving structure includes a moving plate (31) connected to the right side of the moving block (29), a third driving groove (32) is opened on the moving plate (31), and a vertical rod (33) is connected to the lower mold frame (6) below, and the bottom end of the vertical rod (33) moves through the third driving groove (32).

8. The mold opening and closing device for a blow molding machine according to claim 1, characterized in that: The sealing structure includes multiple grooves (35) equally spaced on one side of the upper template (5), with a sealing gasket (30) provided on the groove wall of the groove (35), and multiple protrusions (34) equally spaced on the inner wall of one side of the lower template (9), with the protrusions (34) pressing against the sealing gasket (30).

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