Mold opening and closing device of large blow molding machine

Abstract

This application discloses a mold opening and closing device for a large blow molding machine, comprising: a base frame with slide rails, a mold plate mechanism, a synchronization mechanism, and a lower blow pin mechanism. The mold plate includes a front mold plate, a middle mold plate, and a rear mold plate, which are slidably arranged on the slide rails from left to right. A mold closing cylinder is driven between the middle mold plate and the rear mold plate. The front mold plate and the rear mold plate are connected by a pair of parallel and diagonally arranged connecting rods. The synchronization mechanism includes a synchronization component and a mold moving component. The synchronization component is driven between the middle mold plate and the rear mold plate, and the mold moving component is driven between the synchronization component and the base frame. The lower blow pin mechanism is slidably arranged on the slide rails and located between the front mold plate and the middle mold plate. The lower blow pin mechanism is driven by the synchronization component. This application can balance the force on the mold plate, reduce the risk of off-center loading, improve the alignment accuracy of mold closing, and has a relatively simple structure with fewer failures. It is easy to replace and maintain later, and at the same time improves the mold closing accuracy and stability of the mold plate mechanism.

Description

Technical Field

[0001] This application relates to the field of extrusion blow molding technology for plastic pallets, and in particular to an opening and closing mold device for a large blow molding machine. Background Technology

[0002] Pallets, as an important carrier in today's logistics industry, play a significant role in logistics transportation. Due to their recyclability, low cost, and light weight, they have surpassed wooden and metal pallets and are thus widely used. Blow-molded pallets are based on blow molding technology, which involves heating plastic materials, blow molding, and cooling to form a high-strength, lightweight structure. The final quality of plastic pallets often depends on the stability and reliability of the molding process. How to improve the stability of mold movement during the molding process is an important problem that urgently needs to be solved. Summary of the Invention

[0003] In order to solve the above-mentioned technical problems, the purpose of this application is to provide a mold opening and closing device for a large blow molding machine with high mold closing accuracy and stable mold closing.

[0004] To achieve the above objectives, this application adopts the following technical solution: a mold opening and closing device for a large blow molding machine, comprising: The base frame has slide rails that extend in the left and right directions. The template mechanism includes a front template, a middle template, and a rear template arranged sequentially from left to right. The front template, the middle template, and the rear template are slidably mounted on the slide rail. A mold-closing cylinder is connected between the middle template and the rear template. The mold-closing cylinder is used to drive the middle template to move back and forth in the left-right direction relative to the rear template. The front template and the rear template are connected by a pair of parallel and diagonally arranged connecting rods, each of which extends in the left-right direction. A synchronization mechanism includes a synchronization component and a mold-shifting component. The synchronization component is driven between the middle mold plate and the rear mold plate to drive the front mold plate and the middle mold plate to maintain synchronized opening and closing movements. The mold-shifting component is driven between the synchronization component and the base frame to drive the mold plate mechanism to move relative to the base frame in a left-right direction. The lower blow needle mechanism is slidably arranged on the slide rail and located between the front template and the middle template. The lower blow needle mechanism is drivenly connected to the synchronization component so as to slide synchronously with the synchronization component on the slide rail.

[0005] In the above technical solution, a back plate is further preferably connected to the left side of the front template, one end of each of the connecting rods is detachably connected to the back plate, and the other end of each of the connecting rods is detachably connected to the rear template.

[0006] In the above technical solution, a further preferred embodiment is that the synchronization component includes a synchronization base plate slidably mounted on the slide rail, a synchronization gear rotatably mounted on the synchronization base plate, a first synchronization rack fixedly connected to the middle template, and a second synchronization rack fixedly connected to the rear template. The first synchronization rack and the second synchronization rack both extend in the left-right direction and simultaneously mesh with the synchronization gear.

[0007] In the above technical solution, it is further preferred that at least one pair of sliders are installed at the bottom of the front template, middle template, rear template, lower blow needle mechanism and the synchronous base plate, and the sliders are all in sliding cooperation with the slide rail.

[0008] In the above technical solution, a further preferred embodiment is that the mold-moving assembly includes a mold-moving motor mounted on the synchronous base plate, a mold-moving gear connected to the mold-moving motor, and a mold-moving rack fixed on the base frame. The mold-moving rack extends in the left-right direction, the mold-moving gear meshes with the mold-moving rack, and the mold-moving motor drives the mold-moving gear to rotate around its own axis.

[0009] In the above technical solution, a further preferred embodiment is that an adjusting bar is installed on the base frame, the adjusting bar extends in the left-right direction, and a plurality of adjusting holes are spaced apart in the left-right direction on the adjusting bar. At least one fixing hole is spaced apart in the left-right direction on the synchronous base plate, and the synchronous base plate and the base frame are configured to be fixedly connected by adjusting bolts that pass through one of the fixing holes and one of the adjusting holes simultaneously.

[0010] In the above technical solution, a further preferred embodiment is that a pull rod is connected between the lower blow needle mechanism and the synchronous base plate, the pull rod extends in the left-right direction and is located below the middle template.

[0011] In the above technical solution, a safety light curtain is further preferably installed on the left side of the front template and the right side of the middle template.

[0012] In the above technical solution, a further preferred embodiment is that the rear template has an installation hole for the cylinder body of the mold closing cylinder to pass through, and the air rod of the mold closing cylinder is connected to the middle template through a rotating pin.

[0013] In the above technical solution, it is further preferred that a pair of anti-collision bars are installed on the base frame, one of the anti-collision bars is located on the path of the front template moving to the left and is arranged near the left end of the base frame, and the other anti-collision bar is located on the path of the rear template moving to the right and is arranged near the right end of the base frame.

[0014] Compared with the prior art, this application achieves the following beneficial effects: This application can balance the stress on the template, reduce the risk of off-center loading, improve the alignment accuracy of the mold closing, and has a relatively simple structure with fewer failures, making it easy to replace and maintain later. At the same time, it improves the mold closing accuracy and stability of the template mechanism. Attached Figure Description

[0015] Figure 1 A front view of a mold opening and closing device for a large blow molding machine provided in an embodiment of this application; Figure 2 for Figure 1 A top view of the mold opening and closing device in the middle; Figure 3 for Figure 2 A magnified view of a portion of point A in the middle.

[0016] The components are as follows: 100. Mold opening and closing device; 1. Base frame; 11. Slide rail; 12. Anti-collision bar; 13. Slider; 2. Template mechanism; 21. Front template; 22. Middle template; 221. Fixed seat; 23. Rear template; 24. Mold closing cylinder; 241. Single ear seat; 25. Rotating pin; 26. Connecting rod; 27. Back plate; 28. Safety light curtain; 3. Synchronization mechanism; 31. Synchronization component; 311. Synchronization base plate; 3110. Fixing hole; 312. Synchronization gear; 313. First synchronous rack; 314. Second synchronous rack; 32. Mold moving component; 321. Mold moving motor; 322. Mold moving gear; 323. Mold moving rack; 324. Adjusting bar; 3240. Adjusting hole; 4. Down blow needle mechanism; 41. Pull rod. Detailed Implementation

[0017] To illustrate the technical content, structural features, achieved objectives, and effects of the application in detail, the technical solutions of the embodiments of this application will be described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. In the following description, for illustrative purposes, numerous specific details are set forth to provide a detailed description of various exemplary embodiments or implementations of the invention. However, various exemplary embodiments may also be implemented without these specific details or in one or more equivalent arrangements. Furthermore, the various exemplary embodiments may differ, but are not necessarily exclusive. For example, the specific shape, structure, and characteristics of the exemplary embodiments may be used or implemented in another exemplary embodiment without departing from the inventive concept.

[0018] This application provides an opening and closing mold device for a large blow molding machine, such as... Figure 1 , 2As shown, the mold opening and closing device 100 includes: a base frame 1 and a template mechanism 2, a synchronization mechanism 3 and a blow-down needle mechanism 4 mounted on the base frame 1.

[0019] The base frame 1 supports the template mechanism 2, the synchronization mechanism 3, and the lower blow needle mechanism 4 on a large blow molding machine, and is secured to the blow molding machine with feet on all four sides, providing stable support for the entire mold opening and closing device and ensuring the level of the entire device. The base frame 1 is equipped with slide rails 11 extending in the left and right directions to ensure the smoothness of the mold opening and closing process of the mold opening and closing device.

[0020] The template mechanism 2 includes a front template 21, a middle template 22, and a rear template 23 arranged sequentially from left to right. All three templates are slidably mounted on the slide rail 11 and can slide back and forth along the slide rail 11. The blow molding mold is a split mold, consisting of a front mold and a rear mold facing each other. The front mold is mounted on the front template 21, and the rear mold is mounted on the middle template 22. When the front template 21 and the middle template 22 are closed, they form a complete blow molding mold. The lower blow needle mechanism 4 blows air into the blank inside the closed blow molding mold to perform the blow molding operation.

[0021] A mold-closing cylinder 24 is connected between the middle mold plate 22 and the rear mold plate 23. The mold-closing cylinder 24 drives the middle mold plate 22 to move in the left and right direction relative to the rear mold plate 23 to open and close the mold with the front mold plate 21. The rear mold plate 23 has a mounting hole for the cylinder body of the mold-closing cylinder 24 to pass through. The mounting hole is located at the center of the rear mold plate 23, which can ensure that the force exerted by the mold-closing cylinder 24 on the middle mold plate 22 is more even when it is working. The air rod of the mold-closing cylinder 24 is connected to the middle mold plate 22 by a rotating pin 25. A fixed seat 221 is fixedly installed on the middle mold plate 22. A single ear seat 241 is installed at the end of the air rod of the mold-closing cylinder 24. The rotating pin 25 passes through both the fixed seat 221 and the single ear seat 241, so that the single ear seat 241 can rotate slightly relative to the fixed seat 221, which can effectively reduce the mold-moving impact force when the mold-closing cylinder 24 is working.

[0022] The front template 21 and the rear template 23 are connected by at least one connecting rod 26. Connected by the connecting rod 26, the front template 21 and the rear template 23 can move synchronously in the left-right direction. The connecting rod 26 extends in the left-right direction. In this embodiment, a back plate 27 is installed on the left side of the front template 21. A pair of connecting rods 26 connect the back plate 27 and the rear template 23. The pair of connecting rods 26 are parallel to each other and arranged diagonally. Between the back plate 27 and the rear template 23, one connecting rod 26 is located above and in front of the other connecting rod 26. One end of each connecting rod 26 is detachably connected to the back plate 27, and the other end is detachably connected to the rear template 23, achieving relative fixation between the front template 21 and the rear template 23. This stabilizes the transmission between the front template 21 and the rear template 23, ensuring that when the rear template 23 moves, the pair of connecting rods 26 pull the back plate 27 and its connected front template 21 to move smoothly in the left-right direction. The diagonal arrangement of a pair of connecting rods 26 can balance the force on the front template 21, reduce the risk of off-center loading of the template mechanism 2, and improve the alignment accuracy of mold closing. The three-plate, two-link structure of the template mechanism 2 is relatively simple, has fewer failures, and is easy to replace and maintain after wear.

[0023] The synchronization mechanism 3 is arranged between the middle template 22 and the rear template 23, and includes a synchronization component 31 and a mold-moving component 32. The synchronization component 31 is driven between the middle template 22 and the rear template 23 to drive the front template 21 and the middle template 22 to maintain synchronized opening and closing movements, reduce vibration and offset, and improve the synchronization accuracy and balance of the front template 21 and the middle template 22. The synchronization component 31 includes a synchronization base plate 311 slidably mounted on the slide rail 11, a synchronization gear 312 rotatably mounted on the synchronization base plate 311, a first synchronization rack 313 fixedly connected to the middle template 22, and a second synchronization rack 314 fixedly connected to the rear template 23. The first synchronization rack 313 and the second synchronization rack 314 both extend in the left-right direction and mesh with the synchronization gear 312 simultaneously.

[0024] When the middle template 22 moves to the left under the drive of the mold closing cylinder 24, the first synchronous rack 313 moves to the left under the drive of the middle template 22, and the synchronous gear 312 meshing with the first synchronous rack 313 rotates. At the same time, the second synchronous rack 314 meshing with the synchronous gear 312 pushes the rear template 23 to the right under the drive of the synchronous gear 312. The front template 21, which is fixed to the rear template 23 through a pair of connecting rods 26, moves to the right in sync. The middle template 22 and the front template 21 open in sync, realizing the mold opening.

[0025] When the middle template 22 moves to the right under the drive of the mold closing cylinder 24, the first synchronous rack 313 moves to the right under the drive of the middle template 22. The synchronous gear 312 meshing with the first synchronous rack 313 rotates. At the same time, the second synchronous rack 314 meshing with the synchronous gear 312 pulls the rear template 23 to the left under the drive of the synchronous gear 312. The front template 21, which is fixed to the rear template 23 through a pair of connecting rods 26, moves to the left in sync. The middle template 22 and the front template 21 move closer to each other, thus achieving mold closing.

[0026] like Figure 2 , 3 As shown, the mold-shifting assembly 32 is driven between the synchronous base plate 311 of the synchronous assembly 31 and the base frame 1. The mold-shifting assembly 32 includes a mold-shifting motor 321 mounted on the synchronous base plate 311, a mold-shifting gear 322 driven by the mold-shifting motor 321, and a mold-shifting rack 323 fixed on the base frame 1. The mold-shifting rack 323 extends in the left-right direction, and the mold-shifting gear 322 meshes with the mold-shifting rack 323. The mold-shifting motor 321 drives the mold-shifting gear 322 to rotate around its own axis. When the mold-shifting motor 321 drives the mold-shifting gear 322 to rotate, the mutual abutment between the mold-shifting gear 322 and the mold-shifting rack 323 causes the synchronous base plate 311, on which the mold-shifting motor 321 is mounted, to move in the left-right direction relative to the base frame 1. The middle template 22 and the rear template 23 connected to the synchronous base plate 311, as well as the front template 21 fixed relative to the rear template 23, all move in the left-right direction, preparing for subsequent mold-changing work.

[0027] An adjusting bar 324 is installed on the base frame 1, extending in the left-right direction. Several adjusting holes 3240 are spaced apart along the left-right direction on the adjusting bar 324. At least one fixing hole 3110 is spaced apart along the left-right direction on the synchronous base plate 311. The synchronous base plate 311 and the base frame 1 are fixedly connected by adjusting bolts that pass through both a fixing hole 3110 and an adjusting hole 3240. The template mechanism 2 adjusts its position on the base frame 1 by being driven by a mold-moving motor 321. After the position is determined, the synchronous base plate 311 and the base frame 1 are locked together by adjusting bolts.

[0028] Continue to refer to Figure 1 and Figure 2 A pair of anti-collision bars 12 are installed on the base frame 1. One anti-collision bar 12 is located on the path of the front template 21 moving to the left and is arranged near the left end of the base frame 1. The other anti-collision bar 12 is located on the path of the rear template 23 moving to the right and is arranged near the right end of the base frame 1. The two anti-collision bars 12 are used to prevent the template mechanism 2 from sliding off the slide rail 11 during the movement.

[0029] The lower blow-needle mechanism 4 is slidably arranged on the slide rail 11 and located between the front template 21 and the middle template 22. The lower blow-needle mechanism 4 is fixedly connected to the synchronous base plate 311 of the synchronous assembly 31 by a tie rod 41, so that the lower blow-needle mechanism 4 can slide synchronously on the slide rail 11 with the synchronous base plate 311. The tie rod 41 extends in the left and right direction and is located below the middle template 22. When the mold moving motor 321 drives the synchronous base plate 311 to move, both the template mechanism 2 and the lower blow-needle mechanism 4 move synchronously with the synchronous base plate 311 to adjust their positions on the base frame 1.

[0030] Among them, at least one pair of sliders 13 are installed at the bottom of the front template 21, the middle template 22, the rear template 23, the lower blow needle mechanism 4 and the synchronous base plate 311. Each slider 13 slides in cooperation with the slide rail 11, so that each component can move back and forth smoothly on the slide rail 11, ensuring the smoothness and stability of the mold opening and closing process.

[0031] A safety light curtain 28 is installed on the left side of the front template 21 and the right side of the middle template 22 to provide safety for the closing of the front template 21 and the middle template 22, and to avoid accidental injury to workers during the closing process.

[0032] In this application, when the blank enters the mold plate mechanism, the mold closing cylinder 24 drives the middle mold plate 22 to move to the left. Under the reaction action of the mold closing cylinder 24, the rear mold plate 23 and the relatively fixed front mold plate 21 move to the right. During the closing process of the front mold plate 21 and the middle mold plate 22, the synchronization component 31 ensures the stability of the closing of the front mold plate 21 and the middle mold plate 22 until the mold closing is completed. The mold closing cylinder 24 drives the middle mold plate 22 to move to the right, and the rear mold plate 23 and the relatively fixed front mold plate 21 move to the left. The front mold plate 21 and the middle mold plate 22 open to allow the blow-molded product to be removed. When it is necessary to change the mold or adjust the position of the mold plate mechanism, the mold moving motor starts to work, driving the synchronous base plate 311 to move, thereby driving the mold plate mechanism 2 and the lower blow needle mechanism 4 to move together until the adjustment is completed. Then, the position of the synchronous base plate 311 is locked by adjusting the bolts.

[0033] This application can balance the stress on the template, reduce the risk of off-center loading, improve the alignment accuracy of the mold closing, and has a relatively simple structure with fewer failures, making it easy to replace and maintain later. At the same time, it improves the mold closing accuracy and stability of the template mechanism.

[0034] The foregoing has shown and described the basic principles, main features, and advantages of this application. Those skilled in the art should understand that this application is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this application. Various changes and modifications can be made without departing from the spirit and scope of this application. The scope of protection claimed by this application is defined by the appended claims, specification, and their equivalents.

Claims

1. An opening and closing mold device of a large blow molding machine, characterized by, include: The base frame has slide rails that extend in the left and right directions. The template mechanism includes a front template, a middle template, and a rear template arranged sequentially from left to right. The front template, the middle template, and the rear template are slidably mounted on the slide rail. A mold-closing cylinder is connected between the middle template and the rear template. The mold-closing cylinder is used to drive the middle template to move back and forth in the left-right direction relative to the rear template. The front template and the rear template are connected by a pair of parallel and diagonally arranged connecting rods, each of which extends in the left-right direction. The synchronization mechanism includes a synchronization component and a mold-shifting component. The synchronization component is driven between the middle mold plate and the rear mold plate to drive the front mold plate and the middle mold plate to maintain synchronized opening and closing movements. The mold-shifting component is driven between the synchronization component and the base frame to drive the mold plate mechanism to move in the left-right direction relative to the base frame. as well as The lower blow needle mechanism is slidably arranged on the slide rail and located between the front template and the middle template. The lower blow needle mechanism is drivenly connected to the synchronization component so as to slide synchronously with the synchronization component on the slide rail.

2. The opening and closing mold device according to claim 1, characterized by A back plate is connected to the left side of the front template, one end of each of the connecting rods is detachably connected to the back plate, and the other end of each of the connecting rods is detachably connected to the rear template.

3. The opening and closing mold device according to claim 1, wherein The synchronization component includes a synchronization base plate slidably mounted on the slide rail, a synchronization gear rotatably mounted on the synchronization base plate, a first synchronization rack fixedly connected to the middle template, and a second synchronization rack fixedly connected to the rear template. The first synchronization rack and the second synchronization rack both extend in the left-right direction and mesh with the synchronization gear simultaneously.

4. The opening and closing mold device according to claim 3, wherein At least one pair of sliders are installed at the bottom of the front template, middle template, rear template, lower blow needle mechanism, and synchronous base plate, and the sliders are all in sliding engagement with the slide rail.

5. The opening and closing mold device according to claim 3, wherein The mold-moving assembly includes a mold-moving motor mounted on the synchronous base plate, a mold-moving gear connected to the mold-moving motor, and a mold-moving rack fixed on the base frame. The mold-moving rack extends in the left-right direction, and the mold-moving gear meshes with the mold-moving rack. The mold-moving motor drives the mold-moving gear to rotate around its own axis.

6. The opening and closing mold device according to claim 5, wherein An adjusting bar is installed on the base frame, the adjusting bar extends in the left and right direction, and a plurality of adjusting holes are spaced apart in the left and right direction on the adjusting bar. At least one fixing hole is spaced apart in the left and right direction on the synchronous base plate. The synchronous base plate and the base frame are configured to be fixedly connected by adjusting bolts that pass through one of the fixing holes and one of the adjusting holes simultaneously.

7. The opening and closing mold device according to claim 3, wherein A pull rod is connected between the lower blow needle mechanism and the synchronous base plate. The pull rod extends in the left-right direction and is located below the middle template.

8. The opening and closing mold device according to claim 1, wherein A safety light curtain is installed on the left side of the front template and the right side of the middle template.

9. The opening and closing mold device according to claim 1, wherein The rear mold plate is provided with a mounting hole for the cylinder body of the mold closing oil cylinder, and the air rod of the mold closing oil cylinder is in transmission connection with the middle mold plate through a rotating pin.

10. The opening and closing mold device according to claim 1, wherein A pair of anti-collision rods are mounted on the underframe, one of the anti-collision rods is arranged on the path of left movement of the front mold plate and close to the left end of the underframe, and the other anti-collision rod is arranged on the path of right movement of the rear mold plate and close to the right end of the underframe.

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