Electric radial wall thickness control device in extrusion blow molding machine

Abstract

The utility model discloses an electric radial wall thickness control device in an extrusion blow molding machine, which comprises a machine body, a die head arranged on the machine body, a spreader arranged in the die head, a shunting channel reserved between the spreader and the die head, a die core connected to the spreader, a die sleeve slidably sleeved on the die head, and the die core positioned in the die sleeve, a discharging channel is reserved between the die core and the die sleeve, a conical end is arranged on the die core, a conical hole is formed in the die sleeve, the conical end is located in the conical hole, a variable channel is reserved between the conical end and the conical hole, a lining plate is arranged on the die head, a Y-shaped support is hinged to the lining plate, and a servo electric cylinder is arranged on the machine body. An adjusting rod is hinged between the Y-shaped support and the servo electric cylinder, a lining ring is arranged on the die sleeve, a guide rod is arranged on the lining ring, and the guide rod penetrates through the lining plate in a sliding mode and then is connected with the Y-shaped support in a rotating mode. According to the utility model, the gap of the variable channel can be accurately controlled, so that the wall thickness of an extruded parison can be accurately controlled.

Description

Technical Field

[0001] This utility model relates to an extrusion blow molding machine, and more particularly to an electric radial wall thickness control device in an extrusion blow molding machine. Background Technology

[0002] Most existing plastic products are manufactured using extrusion blow molding. The core component is the die head, which contains a flow divider. A flow divider channel exists between the flow divider and the die head. A die core is mounted on the flow divider, and an outlet channel connecting the die core and the die head is located between the die core and the die head. The extrusion process is as follows: molten plastic enters the die head through the inlet, is evenly distributed within the flow divider channel by the flow divider, and is extruded into the mold through the outlet channel between the die core and the die head under continuous pressure, ultimately forming the final product. To meet different wall thickness requirements, conventional solutions use hydraulic or pneumatic drive systems to adjust the gap between the die core and the die head to control wall thickness. However, this adjustment method is prone to gap control deviations due to system response lag and insufficient position feedback accuracy, resulting in decreased wall thickness uniformity and making it difficult to meet the process requirements of high-precision products. Utility Model Content

[0003] The purpose of this invention is to provide an electric radial wall thickness control device for an extrusion blow molding machine with fast response speed and high control precision.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: an electric radial wall thickness control device in an extrusion blow molding machine, comprising: a machine body, a die head disposed on the machine body, a flow divider disposed in the die head, a flow divider channel between the flow divider and the die head, a die core connected to the flow divider, a die sleeve slidably disposed on the die head, the die core located in the die sleeve, a discharge channel connected to the flow divider channel between the die core and the die sleeve, a tapered end disposed on the die core, a tapered hole disposed on the die sleeve, the tapered end located in the tapered hole, a variable channel connected to the discharge channel between the tapered end and the tapered hole, a liner disposed on the die head, a Y-shaped bracket hinged to the liner, a servo cylinder disposed on the machine body, an adjusting rod hinged between the Y-shaped bracket and the servo cylinder, a bushing disposed on the die sleeve, a guide rod disposed on the bushing, the guide rod slidingly passing through the bushing and rotatably connected to the Y-shaped bracket.

[0005] Furthermore, in the aforementioned electric radial wall thickness control device of the extrusion blow molding machine, a first shoulder is provided on the die head, a liner is sleeved on the die head and abuts against the first shoulder, a sliding sleeve is slidably sleeved on the die head, a bushing is sleeved and fixed on the sliding sleeve, the die sleeve abuts against and is fixed on the sliding sleeve, a second shoulder is provided on the die sleeve, a pressure ring is fixedly provided on the bushing, the pressure ring abuts against the second shoulder of the die sleeve, and the die sleeve extends out of the pressure ring.

[0006] Furthermore, in the aforementioned electric radial wall thickness control device of the extrusion blow molding machine, a first heating ring is fitted on the die head, a second heating ring is fitted on the bushing and pressure ring, and a third heating ring is fitted on the die sleeve extending from the pressure ring.

[0007] Furthermore, in the aforementioned electric radial wall thickness control device of the extrusion blow molding machine, two connecting plates are symmetrically arranged at the left and right ends of the liner, and a first pin is fixed in the connecting plate. Two first bearing holes are symmetrically arranged on the left and right side walls of the Y-shaped bracket, and a first bearing is installed in the first bearing hole. The first pin on the connecting plate passes through the first bearing on the same side. Two second bearing holes are symmetrically arranged on the left and right side walls of the Y-shaped bracket, and a second bearing is installed in the second bearing hole. Two guide rods are symmetrically arranged on the left and right sides of the bushing, and the guide rods slide through the liner and connecting plate. A second pin is fixed in the guide rod and passes through the second bearing on the same side.

[0008] Furthermore, in the aforementioned electric radial wall thickness control device of the extrusion blow molding machine, four guide posts are provided around the liner, and the four guide posts slide through the liner ring.

[0009] Furthermore, in the aforementioned electric radial wall thickness control device of the extrusion blow molding machine, a limit bolt is threadedly connected to the connecting plate.

[0010] Furthermore, in the aforementioned electric radial wall thickness control device of the extrusion blow molding machine, the adjusting rod includes: a pull rod shaft and a spherical bearing. Screws are provided at both the upper and lower ends of the pull rod shaft. A threaded hole is provided in the spherical bearing. Spherical bearings are threaded onto both screws. A locking nut is threaded onto the screw, and the locking nut is screwed and abuts against the spherical bearing. A U-shaped connector is provided on the servo cylinder, and a third pin is fixed in the U-shaped connector. A U-shaped groove is provided on the Y-shaped bracket, and a fourth pin is fixed in the U-shaped groove. Two spherical bearings on the pull rod shaft are respectively fitted onto the third and fourth pins.

[0011] Furthermore, in the aforementioned electric radial wall thickness control device of the extrusion blow molding machine, two first planes are symmetrically milled on the side wall of the tie rod shaft, and two second planes are symmetrically milled on the side wall of the spherical bearing.

[0012] Furthermore, in the aforementioned electric radial wall thickness control device of the extrusion blow molding machine, the first pin, the second pin, the third pin, and the fourth pin all have the same structure. The first pin includes a positioning plate and a shaft body. Two countersunk holes are symmetrically arranged on the positioning plate. The shaft body is vertically arranged on the positioning plate and has a chamfer.

[0013] The advantages of this utility model are as follows: The mold sleeve is equipped with a sliding sleeve, a bushing, and a pressure ring. The mold sleeve is slidably fitted onto the mold head through the cooperation structure between the sliding sleeve, bushing, and pressure ring, resulting in good integration and easy assembly / disassembly. The Y-shaped bracket, when rotating up and down, can drive the mold sleeve to rise and fall on the mold head, thereby controlling the gap of the variable channel between the mold sleeve and the mold core. The Y-shaped bracket is connected to a servo cylinder via an adjusting rod. Driven by the servo cylinder, the Y-shaped bracket can be controlled to rotate up and down. Due to the fast response speed and high control precision of the servo cylinder, the servo cylinder, in conjunction with the adjusting rod and the Y-shaped bracket, can electrically control the mold sleeve to rise and fall with high precision along the mold head, thereby accurately controlling the gap of the variable channel between the mold sleeve and the mold core. This changes the flow path of the molten plastic and the thickness distribution of the extruded preform, thus avoiding wall thickness differences caused by gravity sagging or uneven material flow. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural schematic diagram of the electric radial wall thickness control device in the novel extrusion blow molding machine.

[0015] Figure 2 yes Figure 1 A schematic diagram of the cross-sectional structure.

[0016] Figure 3 yes Figure 1 A schematic diagram of the connection structure between the middle mold head and the mold sleeve.

[0017] Figure 4 yes Figure 1 A schematic diagram of the connection structure between the Y-shaped bracket, the liner, and the bushing.

[0018] Figure 5 yes Figure 1 A cross-sectional view of the adjusting rod.

[0019] Figure 6 yes Figure 4 A schematic diagram of the structure of the first pin. Detailed Implementation

[0020] The technical solution of this utility model will be further described below with reference to the accompanying drawings and preferred embodiments.

[0021] like Figures 1-6As shown, the electric radial wall thickness control device in the extrusion blow molding machine of this utility model includes: a machine body 1, a die head 2 disposed on the machine body 1, a flow divider 21 disposed in the die head 2, a flow divider channel between the flow divider 21 and the die head 2, a die sleeve 3 slidably sleeved on the die head 2, a first shoulder 22 disposed on the die head 2, a liner 4 slidably sleeved on the die head 2, the liner 4 abutting and fixed against the first shoulder 22, a sliding sleeve 5 slidably sleeved on the die head 2, a retaining ring 6 clamped and fixed on the sliding sleeve 5, and the die sleeve 3 abutting against... On the sliding sleeve 5, a second shoulder 31 is provided on the mold sleeve 3, and a pressure ring 51 is fixedly provided on the bushing 6. The pressure ring 51 abuts against the second shoulder 31 of the mold sleeve 3. The mold sleeve 3 extends out of the pressure ring 51. A first heating ring 23 is fitted on the mold head 2. A second heating ring 52 is fitted on the bushing 6 and the pressure ring 51. A third heating ring 32 is fitted on the mold sleeve 3 that extends out of the pressure ring 51. The heating effect of the first heating ring 23, the second heating ring 52 and the third heating ring 32 can prevent the molten plastic from condensing during discharge. A mold core 24 is connected to the flow divider 21. The mold core 24 is located in the mold sleeve 3. A discharge channel connected to the flow divider is left between the mold core 24 and the mold sleeve 3. A tapered end 241 is provided on the mold core 24. A tapered hole 33 is provided on the mold sleeve 3. The tapered end 241 is located in the tapered hole 33. A variable channel connected to the discharge channel is left between the tapered end 241 and the tapered hole 33.

[0022] A Y-shaped bracket 7 is hinged to the liner plate 4. Two connecting plates 41 are symmetrically arranged at the left and right ends of the liner plate 4. A first pin 411 is fixed in the connecting plate 41. Two first bearing holes are symmetrically arranged on the left and right side walls of the Y-shaped bracket 7. A first bearing 71 is installed in the first bearing hole. The first pin 411 on the connecting plate 41 passes through the first bearing 71 on the same side. Two second bearing holes are symmetrically arranged on the left and right side walls of the Y-shaped bracket 7. A second bearing 72 is installed in the second bearing hole. Two guide rods 61 are symmetrically arranged on the left and right sides of the bushing ring 6. The guide rods 61 slide through the liner plate 4 and the connecting plate 41. A second pin 611 is fixed in the guide rod 61. The second pin 611 passes through the second bearing 72 on the same side. Four guide posts 42 are arranged around the liner plate 4. Four guide posts 42 are slidably inserted in the bushing 6. Limiting bolts 412 are threaded onto the connecting plate 41. When the Y-shaped bracket 7 rotates upward, it pulls the bushing 6 upward through the guide rod 61. When the bushing 6 moves upward, it drives the mold sleeve 3 and the sliding sleeve 5 to slide upward along the mold head 2, thereby reducing the gap of the variable channel between the tapered end 241 on the mold core 24 and the tapered hole 33 on the mold sleeve 3. When the Y-shaped bracket 7 rotates downward, it drives the mold head 3 to slide downward along the mold head 2, thereby increasing the gap of the variable channel. When the Y-shaped bracket 7 is not connected to the adjusting rod 9, the Y-shaped bracket 7 will rotate downward under its own weight and abut against the limiting bolts 412. The limiting bolts 412 limit the Y-shaped bracket 7 and prevent the sliding sleeve 5 from separating from the mold head 2 after the Y-shaped bracket 7 rotates downward excessively.

[0023] A servo cylinder 8 is mounted on the machine body 1, and a U-shaped connector 81 is mounted on the servo cylinder 8. A third pin 811 is fixed in the U-shaped connector 81. A U-shaped groove 73 is mounted on the Y-shaped bracket 7, and a fourth pin 731 is fixed in the U-shaped groove 73. An adjusting rod 9 is hinged between the third pin 811 and the fourth pin 731. The adjusting rod 9 includes a pull rod shaft 91 and a joint bearing 92. Screws 911 are mounted at both the upper and lower ends of the pull rod shaft 91. Two first planes 912 are symmetrically milled on the side wall of the pull rod shaft 91. The rod is held in place by a wrench. The two first planes 912 facilitate the screwing of the pull rod shaft 91. A screw hole is provided in the spherical bearing 92. Two second planes 921 are symmetrically milled on the side wall of the spherical bearing 92. The second planes 921 are clamped with a wrench to facilitate the screwing of the spherical bearing 92. The spherical bearing 92 is threaded onto both screws 911. A locking nut 93 is threaded onto the screw 911. The locking nut 93 is screwed and abuts against the spherical bearing 92. The two spherical bearings 92 on the pull rod shaft 91 are respectively fitted onto the third pin 811 and the fourth pin 731. After the two spherical bearings 92 are respectively fitted onto the third pin 811 and the fourth pin 731, the two first planes 912 on the pull rod shaft 91 are clamped with a wrench, and then the pull rod shaft 91 is screwed on. Through the threaded transmission, the spherical bearings 92 at both ends can be simultaneously contracted or lengthened, thereby adjusting the length of the adjusting rod 9. When adjusting the length of the adjusting rod 9, first contract the two spherical bearings 92 on the adjusting rod 9 to make the adjusting rod 9 in its shortest state. Then drive the servo cylinder 8 to the U-shaped connector 81 to the lowest position. Then, fit one of the spherical bearings 92 onto the third pin 811 in the U-shaped connector 81. The Y-shaped bracket 7 rotates under its own weight and abuts against the limit bolt 412. Then rotate the pull rod shaft 91 in the adjusting rod 9 to move the two spherical bearings 92 together. As the length of the adjustment rod increases, when the other joint bearing 92 on the adjustment rod 9 reaches the Y-shaped bracket 7, the joint bearing 92 is fitted onto the fourth pin 731 of the Y-shaped bracket 7. Then, the pull rod shaft 91 in the adjustment rod 9 is rotated in the opposite direction to retract the two joint bearings 92 synchronously. During synchronous retraction, since the U-shaped joint 81 is stationary, the adjustment rod 9 will pull the Y-shaped bracket 7 to rotate upward. When the Y-shaped bracket 7 rotates upward, it will drive the sliding sleeve 5 and the mold sleeve 3 to move upward along the mold head 2. When the mold sleeve 3 moves upward until the bottom wall of the mold sleeve 3 is flush with the bottom wall of the mold core 24, it means that the mold sleeve 3 has moved upward to the correct position. The length of the adjustment rod 9 is no longer adjusted. The locking nut 93 is screwed against the joint bearing 92 to lock the joint bearing 92, thereby fixing the length of the adjustment rod 9.

[0024] In use, the servo electric cylinder 8 controls the up-and-down rotation of the Y-shaped bracket 7 via the adjusting rod 9. The Y-shaped bracket 7 can then drive the mold sleeve 3 and the sliding sleeve 5 to slide up and down along the mold head 2 via the bushing 6, thereby changing the gap of the variable channel between the tapered end 241 on the mold core 24 and the tapered hole 33 on the mold sleeve 3. By changing the gap of the variable channel, different wall thickness requirements can be met. The servo electric cylinder 8 has a fast response speed and high operating accuracy, and can accurately control the gap of the variable channel between the mold sleeve 3 and the mold core 24, thereby changing the flow path of the molten plastic and the thickness distribution of the extruded preform, thus avoiding wall thickness differences caused by gravity sagging or uneven material flow.

[0025] In this embodiment, the first pin 411, the second pin 611, the third pin 811, and the fourth pin 731 all have the same structure. The first pin 411 includes a positioning plate 4111 and a shaft body 4112. Two countersunk holes 4113 are symmetrically arranged on the positioning plate 4111. The shaft body 4112 is vertically arranged on the positioning plate 4111 and has a chamfer 4113. After the shaft body 4112 on the first pin 411 passes through the connecting plate 41, the positioning plate 4111 on the first pin 411 abuts against the connecting plate 41. Then, it is connected to the connecting plate 41 by a countersunk bolt passing through the countersunk hole 4113. This facilitates the disassembly and assembly of the first pin 411 and ensures the connection stability between the first pin 411 and the connecting plate 41.

[0026] 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. An electric radial wall thickness control device in an extrusion blow molding machine, comprising: The utility model relates to a machine body is provided with a die head on the machine body, is provided with a flow distribution shuttle in the die head, leaves the flow distribution channel between the flow distribution shuttle and the die head, its characterized in that: the flow distribution shuttle is connected with the die core, the die sleeve is slidably arranged on the die head, and the die core is located in the die sleeve, and the discharge channel that is communicated with the flow distribution channel is left between the die core and the die sleeve, the tapered end is arranged on the die core, the tapered hole is arranged on the die sleeve, the tapered end is located in the tapered hole, and the variable channel that is communicated with the discharge channel is left between the tapered end and the tapered hole, the lining plate is arranged on the die head, the Y type support is hinged on the lining plate, the servo cylinder is arranged on the machine body, the adjusting rod is hinged between the Y type support and the servo cylinder, the lining ring is arranged on the die sleeve, and the guide rod is arranged on the lining ring.

2. An electrodynamic radial wall thickness control device in an extrusion blow molding machine according to claim 1, characterized in that: A first shoulder is arranged on the die head, the lining plate is sleeved on the die head and abuts against the first shoulder, the slide sleeve is slidably arranged on the die head, the lining ring is fixedly sleeved on the slide sleeve, the die sleeve is fixedly abutted on the slide sleeve, a second shoulder is arranged on the die sleeve, the pressing ring is fixedly arranged on the lining ring and abuts against the second shoulder of the die sleeve, and the die sleeve extends out of the pressing ring.

3. An electrodynamic radial wall thickness control device in an extrusion blow molding machine according to claim 2, characterized in that: A first heating ring is sleeved on the die head, a second heating ring is sleeved on the lining ring and the pressing ring, and a third heating ring is sleeved on the die sleeve extending out of the pressing ring.

4. An electrodynamic radial wall thickness control device in an extrusion blow molding machine according to claim 3, characterized in that: Two connecting plates are symmetrically arranged on the left and right ends of the lining plate, the first pin shaft is fixedly arranged in the connecting plate, the first bearing hole is symmetrically arranged on the left and right side walls of the Y type support, the first bearing is arranged in the first bearing hole, the first pin shaft on the connecting plate is arranged in the same side first bearing, the second bearing hole is symmetrically arranged on the left and right side walls of the Y type support, the second bearing is arranged in the second bearing hole, and the two guide rods are symmetrically arranged on the lining ring and slidably arranged in the lining plate and the connecting plate.

5. An electrodynamic radial wall thickness control device in an extrusion blow molding machine according to claim 1, characterized in that: Four guide columns are arranged around the lining plate and slidably arranged in the lining ring.

6. An electrodynamic radial wall thickness control device in an extrusion blow molding machine according to claim 4, characterized in that: The limiting bolt is threadedly connected to the connecting plate.

7. An electrodynamic radial wall thickness control device in an extrusion blow molding machine according to claim 1, characterized in that: The adjusting rod comprises a pull rod shaft, a joint bearing, screw rods arranged at the upper and lower ends of the pull rod shaft, screw holes arranged in the joint bearing, the joint bearings threadedly connected to the two screw rods, lock nuts threadedly connected to the screw rods and screwed against the joint bearings, a U-shaped joint arranged on the servo cylinder, a third pin shaft fixedly arranged in the U-shaped joint, a U-shaped groove arranged on the Y type support, a fourth pin shaft fixedly arranged in the U-shaped groove, and the two joint bearings on the pull rod shaft being sleeved on the third pin shaft and the fourth pin shaft respectively.

8. An electrodynamic radial wall thickness control device in an extrusion blow molding machine according to claim 7, characterized in that: Two first planes are symmetrically milled on the side wall of the pull rod shaft, and two second planes are symmetrically milled on the side wall of the joint bearing.

9. An electrodynamic radial wall thickness control device in an extrusion blow molding machine according to claim 7, characterized in that: The first pin shaft, the second pin shaft, the third pin shaft and the fourth pin shaft have the same structure, and the first pin shaft comprises a positioning plate and a shaft body, two counterbores are symmetrically arranged on the positioning plate, the shaft body is vertically arranged on the positioning plate, and a chamfer is arranged on the shaft body.

Images