Cold cut encapsulation device in an extrusion blow molding machine
By using front and rear cylinder-driven cutter holders with the same structure and power in the cold-cutting encapsulation device, the problems of complex structure and preform adhesion in traditional devices are solved, achieving smooth operation and reliable preform sealing, and supporting the smooth progress of subsequent blow molding processes.
Patent Information
- Application Number
- CN202521301530.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-24
- Publication Date
- 2026-06-30
- Estimated Expiration
- 2035-06-24
AI Technical Summary
Traditional cold-cutting encapsulation devices have complex structures, require high precision in processing and installation, have sluggish cutting action, require large pressure for cylinder operation, and are prone to causing the top and bottom of the tubular preform to stick together and seal, affecting subsequent blow molding processes.
The front and rear cylinders with the same structure and power drive the front and rear cutter holders respectively. The adjustable height adjustment plate and guide rod structure ensure smooth cutting action, avoid the cutter from damaging the bottom wall of the parison, and keep the top of the parison open in the forming mold.
It achieves a simple structure, convenient installation, and stable operation, avoiding adhesion and closure of the bottom wall of the parison, while ensuring that the top of the parison is not adhered and closed, which facilitates secondary blowing and shaping by the blow needle in the next process.
Smart Images
Figure CN224426448U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of extrusion blow molding machines, and more particularly to a cold-cutting and sealing device in an extrusion blow molding machine. Background Technology
[0002] In the blow molding process, the blow molding equipment first blows the molten raw material into a tubular preform through the blow inflation mechanism, and then the preform enters the molding die to be further inflated and shaped by the blow needle mechanism. Since the preform itself is continuous, a cold-cutting and sealing device is installed on the equipment to ensure that the raw material is accurately measured in each molding process. This device achieves quantitative supply of the preform through periodic cutting action, thereby ensuring that the mold receives the amount of material that meets the product specifications each time it closes. During cutting, it is necessary to ensure that the bottom wall of the tubular preform remaining on the blow inflation mechanism is a closed structure to facilitate the next material drop, while the top of the tubular preform falling into the molding die is an open structure.
[0003] Traditional cold-cutting and encapsulation devices use a single cylinder to drive the front and rear cutter holders in relative motion via a synchronization mechanism. The blades are directly mounted on the front and rear cutter holders, and the relative motion of the front and rear cutter holders simultaneously cuts and encapsulates the tubular blank. This type of cold-cutting blade structure is relatively complex. Due to the synchronization mechanism, high precision is required for processing and installation. The cutting action is sluggish, the cylinder action requires high pressure, and the impact is significant. The main problem is that when the front and rear cutter holders cut the tubular blank, they can not only cause the bottom wall of the tubular blank remaining on the blow molding mechanism to stick and seal, but also easily cause the top of the tubular blank falling into the forming mold to stick and seal. After the top of the tubular blank in the forming mold is stuck and sealed, the blow needle of the next blow molding process cannot reach into the tubular blank in the forming mold for secondary blow molding and shaping. Utility Model Content
[0004] The purpose of this invention is to provide a cold-cutting and sealing device for an extrusion blow molding machine that has a simple structure, stable operation, and can prevent the upper end of the tubular preform falling into the forming mold from sticking and sealing after cutting the tubular preform.
[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a cold-cutting and sealing device in an extrusion blow molding machine, comprising: two fixed plates fixed on the extrusion blow molding machine, an adjustable plate with adjustable height between the two fixed plates, a front cylinder and a rear cylinder with the same structure and power respectively installed on the front and rear side walls of the adjustable plate, a connecting plate connected to the piston rod of the rear cylinder, a guide rod installed at each end of the connecting plate, the two guide rods sliding forward through the adjustable plate and connecting to the front blade holder, a front clamping plate installed on the rear side wall of the front blade holder, a rodless cylinder installed on the front blade holder, a rearwardly extending cutter installed on the slide of the rodless cylinder, the cutter being located below the front blade holder, a rear blade holder connected to the piston rod of the front cylinder, the rear blade holder being slidably locked between the two guide rods, a rear clamping plate installed on the front side wall of the rear blade holder, the rear clamping plate being horizontally aligned with the front clamping plate.
[0006] Furthermore, in the aforementioned cold-cutting encapsulation device of the extrusion blow molding machine, the connection structure between the adjusting plate and the fixed plate is as follows: a screw hole plate is provided on the fixed plate, a screw is threadedly connected to the screw hole plate, an inverted T-shaped clamp is provided at the lower end of the screw, an inverted T-shaped slot is provided at the left and right ends of the upper side wall of the adjusting plate, the inverted T-shaped clamps on the two screws are engaged in the corresponding inverted T-shaped slots, a number of first threaded holes are provided on the fixed plate from top to bottom, and a long strip adjusting hole corresponding to the first threaded hole is vertically provided at the left and right ends of the adjusting plate, and a number of locking bolts threadedly connected to the first threaded holes are passed through the long strip adjusting holes.
[0007] Furthermore, in the aforementioned cold-cutting encapsulation device of the extrusion blow molding machine, a square column is provided at the upper end of the screw.
[0008] Furthermore, in the aforementioned cold-cutting encapsulation device of the extrusion blow molding machine, the rear cylinder directly abuts against the rear side wall of the adjusting plate and is connected by connecting bolts, and a cylinder seat is provided on the front side wall of the adjusting plate, with the front cylinder abutting against the cylinder seat and connected by connecting bolts.
[0009] Furthermore, in the aforementioned cold-cutting and sealing device of the extrusion blow molding machine, a first flange linear bearing is provided at the left and right ends of the adjusting plate, and a second flange linear bearing is provided at the left and right ends of the rear cutter holder, with two guide rods slidably locked in the first flange linear bearing and the second flange linear bearing on the same side.
[0010] Furthermore, in the aforementioned cold-cutting encapsulation device of the extrusion blow molding machine, a baffle is covered on the slide, and an installation groove inclined from front to back and from right to left is provided on the baffle. Two second threaded holes are provided in the installation groove. The depth of the installation groove is the same as the thickness of the cutter. Two through holes are provided on the cutter. The cutter is engaged in the installation groove and abuts against the slide. The two through holes on the cutter are aligned with the two second threaded holes in the installation groove. A fixing bolt is threaded between the aligned through holes and the second threaded holes.
[0011] The advantages of this utility model are: simple structure and convenient installation. By using a front cylinder and a rear cylinder with the same structure and power to drive the rear cutter post and the front cutter post respectively, the driving action can be completed with a small pressure, so that the rear cutter post and the front cutter post are subjected to a small impact force and maintain stable movement. When the rear clamping plate on the rear cutter post and the front clamping plate on the front cutter post clamp the tubular blank, the cutter quickly cuts the tubular blank laterally. This ensures that the bottom wall of the tubular blank left on the blow molding mechanism is glued and sealed, and at the same time, it ensures that the cut end of the tubular blank left in the molding mold will not be glued and sealed, so that the blow needle of the next blow molding process can smoothly extend into the tubular blank in the molding mold for secondary blow molding and shaping. Attached Figure Description
[0012] Figure 1 It is the cold-cutting and sealing device in the extrusion blow molding machine described in this utility model.
[0013] Figure 2 yes Figure 1 A schematic diagram of the structure from a top-down view.
[0014] Figure 3 yes Figure 2 A schematic diagram of the connection structure between the rodless cylinder and the cutter. Detailed Implementation
[0015] The technical solution of this utility model will be further described below with reference to the accompanying drawings and preferred embodiments.
[0016] like Figures 1-3As shown, the cold-cutting and sealing device in the extrusion blow molding machine of this utility model includes: two fixed plates 1 fixed on the extrusion blow molding machine, an adjustable plate 2 with adjustable height between the two fixed plates 1, a screw hole plate 11 on the fixed plate 1, a screw 12 threadedly connected in the screw hole plate 11, an inverted T-shaped clamp 121 at the lower end of the screw 12, and an inverted T-shaped slot 21 at the left and right ends of the upper side wall of the adjustable plate 2. The inverted T-shaped clamps 121 on the two screws 12 are engaged in the corresponding inverted T-shaped slots 21. Rotating the screw 12 can drive the adjustable plate 2 to rise and fall through the threaded transmission between the screw 12 and the screw hole plate 11. A square post 122 is provided at the upper end of the screw 12. The screw 12 can be easily rotated by clamping the square post 122 with a wrench. A plurality of first threaded holes 13 are provided on the fixed plate 1 from top to bottom. A long strip adjustment hole 22 corresponding to the first threaded hole 13 on the corresponding side is provided vertically at the left and right ends of the adjustment plate 2. A plurality of locking bolts threadedly connected to the first threaded holes 13 are passed through the long strip adjustment hole 22. When the adjustment plate 2 is raised or lowered to the designated position, the adjustment plate 2 can be fixed on the two fixed plates 1 by the threaded connection structure between the locking bolts and the first threaded holes 13, thereby fixing the cold cutting and sealing device in the extrusion blow molding machine of this utility model on the extrusion blow molding machine.
[0017] A front cylinder 3 and a rear cylinder 4 with the same structure and power are respectively installed on the front and rear side walls of the adjusting plate 2. The rear cylinder 4 directly abuts against the rear side wall of the adjusting plate 2 and is connected by connecting bolts. A connecting plate 41 is connected to the piston rod of the rear cylinder 4. A guide rod 42 is installed at each of the left and right ends of the connecting plate 41. A first flange linear bearing 23 is installed at each of the left and right ends of the adjusting plate 2. The two guide rods 42 slide forward through the first flange linear bearings 23 on the adjusting plate 2 and are connected to the front tool holder 5. A front clamping plate 51 is installed on the rear side wall of the front tool holder 5. A rodless cylinder 52 is installed on the front tool holder 5. The slide of the rodless cylinder 52 faces downward. A baffle 53 is covered on the slide of the rodless cylinder 52. A groove is provided on the baffle 53 from front to back and from right to left. An inclined mounting groove 531 has two second threaded holes 532. A cutter 6 is fitted into the mounting groove 531. The thickness of the cutter 6 is the same as the depth of the mounting groove 531. The cutter 6 is fitted into the mounting groove 531 and abuts against the slide. The cutter 6 is located below the front clamping plate 5. The cutter 6 extends backward from the front cutter holder 5 and the cutting edge of the cutter 6 faces to the left. Two through holes 61 are provided on the cutter 6. The two through holes 61 on the cutter 6 are aligned one-to-one with the two second threaded holes 532 in the mounting groove 531. A fixing bolt is threaded between the aligned through holes 61 and the second threaded holes 532 to fix the cutter 6. The positions of the through holes 61 and the second threaded holes 532 are offset from the slide, so the fixing bolt will not interfere with the slide. A cylinder seat 24 is provided on the front side wall of the adjusting plate 2. The front cylinder 3 abuts against the cylinder seat 24 and is connected by connecting bolts. Since the front cylinder 3 and the rear cylinder 4 have the same structure and power, if they are directly fixed on the front and rear side walls of the adjusting plate 2, interference will occur due to the connection position of the connecting bolts of the adjusting plate 2 being the same, and it will be impossible to fix them at the same time. Now, by providing a cylinder seat 24 on the front side wall of the adjusting plate 2, the connection position of the connecting bolts of the rear cylinder 4 can be avoided. The front cylinder 3 can be fixed on the front side wall of the adjusting plate 2 through the cylinder seat 24. A rear tool holder 7 is connected to the piston rod of the front cylinder 24. A second flange linear bearing 71 is provided on the left and right ends of the rear tool holder 7. The two second flange linear bearings 71 are slidably mounted on two guide rods 42. When the front cylinder 3 drives the rear tool holder 7, the rear tool holder 7 can move back and forth along the guide rods 42. A rear clamping plate 72 is provided on the front side wall of the rear tool holder 7. The rear clamping plate 72 is horizontally aligned with the front clamping plate 51.
[0018] After the tubular preform falls into the forming mold from the inflation mechanism, the rear cylinder 4 and the front cylinder 3 start synchronously with the same air pressure. The rear cylinder 4 pushes the connecting plate 41 backward, and the connecting plate 41 drives the two guide rods 42 and the front tool holder 5 to move backward. The front cylinder 3 pushes the rear tool holder 7 forward. The front tool holder 5 and the rear tool holder 7 move in opposite directions. The front clamping plate 51 on the front tool holder 5 and the rear clamping plate 72 on the rear tool holder 7 engage to clamp the tubular preform, causing the clamped tubular preform to be bonded and sealed. Then, the rodless... Cylinder 52 drives the cutter 6 to move rapidly to the left, and the cutter 6 can cut the tubular parison. Since the cutter 6 is located below the front clamping plate 51, the cutter 6 will not damage the adhesive and closed structure of the bottom wall of the tubular parison left on the blow molding mechanism. The cutter 6 cuts the tubular parison quickly and laterally, so the cut end of the tubular parison left in the molding die will not be adhesive and closed. The blow needle of the next blow molding process can smoothly extend into the tubular parison in the molding die for secondary blow molding and shaping.
[0019] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although the utility model has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of this utility model. Any modifications or equivalent substitutions that do not depart from the spirit and scope of this utility model should be covered within the protection scope of the claims of this utility model.
Claims
1. A cold-cutting and sealing device in an extrusion blow molding machine, characterized in that: include: Two fixed plates are mounted on the extrusion blow molding machine. An adjustable plate with adjustable height is set between the two fixed plates. A front cylinder and a rear cylinder with the same structure and power are respectively set on the front and rear side walls of the adjustable plate. A connecting plate is connected to the piston rod of the rear cylinder. A guide rod is set at each end of the connecting plate. The two guide rods slide forward through the adjustable plate and connect to the front blade holder. A front clamping plate is set on the rear side wall of the front blade holder. A rodless cylinder is set on the front blade holder. A cutter extending backward is set on the slide of the rodless cylinder. The cutter is located below the front blade holder. A rear blade holder is connected to the piston rod of the front cylinder. The rear blade holder is slidably locked between the two guide rods. A rear clamping plate is set on the front side wall of the rear blade holder. The rear clamping plate is horizontally aligned with the front clamping plate.
2. The cold-cutting and sealing device in the extrusion blow molding machine according to claim 1, characterized in that: The connection structure between the adjusting plate and the fixed plate is as follows: a screw hole plate is provided on the fixed plate, a screw rod is threadedly connected to the screw hole plate, an inverted T-shaped clamp is provided at the lower end of the screw rod, an inverted T-shaped slot is provided at the left and right ends of the upper side wall of the adjusting plate, and the inverted T-shaped clamps on the two screw rods are engaged in the corresponding inverted T-shaped slots. Several first threaded holes are provided on the fixed plate from top to bottom. A long strip adjusting hole corresponding to the first threaded hole on the left and right ends of the adjusting plate is vertically provided. Several locking bolts threadedly connected to the first threaded holes are passed through the long strip adjusting holes.
3. The cold-cutting and sealing device in the extrusion blow molding machine according to claim 2, characterized in that: A square post is provided at the upper end of the screw.
4. The cold-cutting and sealing device in the extrusion blow molding machine according to claim 1, characterized in that: The rear cylinder rests directly against the rear side wall of the adjusting plate and is connected by connecting bolts. A cylinder seat is provided on the front side wall of the adjusting plate, and the front cylinder rests against the cylinder seat and is connected by connecting bolts.
5. The cold-cutting and sealing device in the extrusion blow molding machine according to claim 1, characterized in that: First flange linear bearings are installed at the left and right ends of the adjusting plate, and second flange linear bearings are installed at the left and right ends of the rear tool holder. Two guide rods are slidably locked in the first flange linear bearings and second flange linear bearings on the same side.
6. The cold-cutting and sealing device in the extrusion blow molding machine according to claim 1, characterized in that: A baffle is fitted onto the slide block, and an installation groove that slopes from front to back and from right to left is provided on the baffle. Two second threaded holes are provided in the installation groove. The depth of the installation groove is the same as the thickness of the cutter. Two through holes are provided on the cutter. The cutter is engaged in the installation groove and abuts against the slide block. The two through holes on the cutter are aligned with the two second threaded holes in the installation groove. A fixing bolt is threaded between the aligned through holes and the second threaded holes.