A blow molding apparatus for plastic hollow articles

Abstract

The application relates to a blow molding device for plastic hollow parts and relates to the technical field of blow molding devices, which comprises a device body and an extrusion module, the device body is internally provided with an extrusion channel, the extrusion module is arranged at the outlet of the extrusion channel and is communicated with the extrusion channel, and a dose adjusting unit is arranged between the device body and the extrusion module; the dose adjusting unit comprises a dose channel, one end of the dose channel is communicated with the extrusion channel, the other end is communicated with the extrusion module, and the dose adjusting unit comprises a temporary storage cavity communicated with the dose channel. According to actual production needs, the melt mass extruded by the dose adjusting unit can be adjusted, the wall thickness of each part of the hollow part blow molded is uniform, the yield is improved, and various production needs can be met.

Description

Technical Field

[0001] This invention relates to the field of blow molding equipment technology, and more particularly to a blow molding equipment for hollow plastic parts. Background Technology

[0002] Blow molding equipment, also known as an extruder, is the main equipment for molding hollow plastic containers. For manufacturing large products (such as oil drums and highway guardrails), a storage cylinder type die head is generally used. The extruder forces molten material into the die head, the die closes, and the material is stored in the storage chamber. Under the pressure of the material, the injection ring is pushed upwards, which in turn drives the piston rod of the injection cylinder upwards. When the set storage volume is reached, the injection cylinder drives the injection ring downwards, causing the molten material to be ejected from the annular extrusion port between the core die and the die head, forming a material tube. Depending on the product's geometry, the wall thickness of different parts of the material tube varies; some parts require more material, while others require less, to ensure a product with uniform wall thickness. However, the positions of the core mold and the die in the existing storage cylinder type mold head are fixed, so the axial wall thickness of the material tube cannot be adjusted. This can easily cause uneven wall thickness of the final product due to the inconsistent wall thickness of the material tube during the blowing process, and even cause cracking. As a result, many products are scrapped and the molding efficiency is low. Summary of the Invention

[0003] To address the problem of uneven wall thickness caused by inconsistent wall thickness in the blow molding process of hollow parts, this application provides a blow molding device for plastic hollow parts.

[0004] This application provides a blow molding device for hollow plastic parts, including a device body and an extrusion module. The device body is provided with an extrusion channel, and the extrusion module is located at the outlet of the extrusion channel and connected to the extrusion channel. A dosage adjustment unit is provided between the device body and the extrusion module. The dose adjustment unit includes a dose channel, one end of which is connected to the extrusion channel and the other end of which is connected to the extrusion module. The dose adjustment unit also includes a temporary storage cavity connected to the dose channel.

[0005] By adopting the above technical solution, the molten material extruded from the extrusion channel is adjusted by the dosage adjustment unit before entering the extrusion module. The molten material is then extruded to form a hollow part. After the dosage adjustment unit adjusts the extrusion dosage of the molten material, it can adapt to the wall thickness of the hollow part at different positions.

[0006] Furthermore, the dose adjustment unit also includes a telescopic rod, which is installed in the temporary storage cavity and extends and retracts along the extension direction of the temporary storage cavity; The dose adjustment unit includes a first state and a second state. When the dose adjustment unit is in the first state, the telescopic rod extends out of the temporary storage cavity and into the dose channel. The temporary storage cavity is not connected to the dose channel. When the dose adjustment unit is in the second state, the telescopic rod retracts into the temporary storage cavity, which is connected to the dose channel.

[0007] By adopting the above technical solution, the volume of the dose channel is reduced by pressing the telescopic rod into it, thereby reducing the dose of molten material extruded by the dose adjustment unit. The molten material entering the dose channel is stored in a temporary storage cavity. When a larger dose of molten material is needed in the extrusion module, the telescopic rod can push the molten material in the temporary storage cavity into the dose channel, thereby increasing the dose of molten material in the dose channel.

[0008] Furthermore, the dosage adjustment unit also includes a telescopic cylinder, a connecting rod is fixedly mounted on the drive shaft of the telescopic cylinder, the connecting rod is fixedly connected to the telescopic rod, and the telescopic rod moves synchronously with the drive shaft of the telescopic cylinder; the dosage adjustment unit also includes a limiting seat for limiting the first extreme position of the connecting rod, and a proximity switch for detecting the second extreme position of the connecting rod; When the dose adjustment unit is in the first state, the connecting rod abuts against the limiting seat; When the dose adjustment unit is in the second state, the proximity switch detects the connecting rod.

[0009] By adopting the above technical solution, during the process of adjusting the dosage of the molten material extruded from the dosage adjustment unit, the limit seat and proximity switch can control the dosage under two extreme states of the dosage adjustment unit, thus achieving controllable range of molten material dosage adjustment. Simultaneously, the telescopic cylinder combined with the proximity switch facilitates automated control, contributing to improved automation levels.

[0010] Furthermore, the outlet of the dosage channel is also connected to an equalization mechanism, which includes a delivery hose. The inlet end of the delivery hose is connected to the dosage channel, and the outlet end is connected to the feed channel of the extrusion module.

[0011] By adopting the above technical solution, the equalization mechanism evenly feeds the molten material extruded from the dosage channel into the extrusion module and into the feeding channel of the extrusion module. This ensures that the molten material extruded after the dosage adjustment unit adjusts the dosage enters the feeding channel evenly, ensuring timely and accurate delivery and guaranteeing blow molding quality.

[0012] Furthermore, the extrusion module includes multiple extrusion heads and a feed hopper that is connected to the multiple extrusion heads. The equalization mechanism is installed in the feed hopper. The equalization mechanism includes a moving component that drives the conveying hose to move. The moving component clamps the outlet end of the conveying hose. The moving direction of the moving component is the same as the arrangement direction of the multiple extrusion heads.

[0013] By adopting the above technical solution and using multiple extrusion heads, multiple hollow parts can be blow-molded simultaneously. The molten material entering the feed hopper through the equalization mechanism can be evenly distributed into each extrusion head, ensuring that the extruded products have the same quality and avoiding different dosages of molten material entering different extrusion heads, which would affect the production quality.

[0014] Furthermore, two corresponding clamping blocks are fixedly installed on the moving part, and each clamping block is provided with an arc-shaped groove for engaging and clamping the delivery hose.

[0015] By adopting the above technical solution, clamping blocks are used to secure the conveying hose, ensuring that the conveying hose can move synchronously during the movement of the moving parts.

[0016] Furthermore, the equalization mechanism includes a fixed base installed in the feed hopper, and the fixed base is provided with a guide groove for installing the moving part. The extending direction of the guide groove is the same as the arrangement direction of the plurality of extrusion heads. The equalization mechanism also includes a drive motor, a crank, and a connecting rod. One end of the connecting rod is rotatably connected to the moving part, and the other end is connected to the crank. The drive part of the drive motor is fixedly connected to the crank.

[0017] By adopting the above technical solution, the reciprocating movement of the moving part is realized. The moving part is connected by a crank and connecting rod, which is convenient. The drive motor can rotate in one direction, and the moving speed of the moving part can be adjusted by adjusting the speed of the drive motor, which is simple to control.

[0018] Furthermore, a guide roller is also installed inside the fixed base. The guide roller is connected to the rotating shaft of the moving part, and the guide roller moves synchronously with the moving part along the extension direction of the guide groove.

[0019] By adopting the above technical solution, the guide roller moves within the guide groove, ensuring the smooth operation of the moving block and improving the moving accuracy of the moving block.

[0020] Furthermore, the fixing seat is installed in the middle section of the feed hopper, and the ends of the fixing seat correspond to the extrusion head on the inner end side of the feed hopper.

[0021] By adopting the above technical solution, it is ensured that the moving part can correspond to each extrusion head during the movement of the moving part on the fixed seat, and the molten material extruded from the conveying hose can be evenly entered into each extrusion head.

[0022] In summary, this application includes at least one of the following beneficial technical effects: The dosage adjustment unit is set to adjust the mass of the molten material extruded by the dosage adjustment unit according to actual production needs, so that the wall thickness of each part of the blow-molded hollow part is uniform and the yield is improved.

[0023] The equalization mechanism ensures that the molten material is evenly extruded after passing through it and enters the corresponding extrusion head in a uniform manner, thus preventing sudden changes in thickness.

[0024] It is more flexible and convenient to use, meets various production needs, and improves production efficiency. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the blow molding equipment provided by the present invention; Figure 2 This is a schematic cross-sectional view of the blow molding equipment provided by the present invention. Figure 3 This is a schematic diagram of the dose adjustment unit structure provided by the present invention; Figure 4 This is a schematic diagram of the first state cross-sectional structure of the dose adjustment unit provided by the present invention; Figure 5 This is a schematic diagram of the second state cross-sectional structure of the dose adjustment unit provided by the present invention; Figure 6 This is a schematic diagram of the extrusion module structure provided by the present invention; Figure 7 This is a schematic diagram of the internal structure of the extrusion module provided by the present invention; Figure 8 A schematic diagram of the balancing mechanism provided by the present invention.

[0026] Numbering on the map: 1. Equipment body; 11. Extrusion channel; 12. Equipment frame; 2. Extrusion module; 21. Feed hopper; 22. Extrusion head; 23. Feed inlet; 3. Dosage adjustment unit; 31. Dosage channel; 32. Temporary storage chamber; 33. Telescopic rod; 34. Telescopic cylinder; 35. Limit seat; 36. Proximity switch; 37. Connecting rod; 41. Cylinder; 42. Cylinder body; 5. Balancing mechanism; 51. Moving part; 52. Clamping block; 521. Arc groove; 53. Fixed seat; 531. Guide slide; 54. Drive motor; 55. Crank; 56. Connecting rod; 57. Guide roller. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Please refer to the following: Figure 1 , Figure 2 and Figure 3 As shown, a blow molding device for hollow plastic parts includes a device body 1 and an extrusion module 2. The device body 1 has an extrusion channel 11, and the extrusion module 2 is located at the outlet of the extrusion channel 11 and connected to the extrusion channel 11. A dosage adjustment unit 3 is provided between the device body 1 and the extrusion module 2. The device body 1 is mounted on a device frame 12. The blow molding raw material enters the extrusion channel 11 in the device body 1, and after melt extrusion, it enters the extrusion module 2 for blow molding into a hollow part. Since the extrusion dosage of the molten material is constant after entering the extrusion channel 11, it is difficult to apply to blow molding of hollow parts with different wall thicknesses. By setting the dosage adjustment unit 3, after the molten material is extruded from the extrusion channel 11, the dosage of the extruded molten material is first adjusted by the dosage adjustment unit 3 before being extruded into the extrusion module 2 for subsequent blow molding.

[0029] In this embodiment, the dose adjustment unit 3 includes a dose channel 31, one end of which is connected to the extrusion channel 11 and the other end is connected to the extrusion module 2. The dose adjustment unit 3 includes a temporary storage cavity 32 connected to the dose channel 31. After the molten material enters the dose adjustment unit 3, it enters the dose channel 31 of the dose adjustment unit 3 and is extruded from the dose channel 31 and then enters the extrusion module 2. The molten material entering the dose channel 31 can be temporarily stored in the temporary storage cavity 32.

[0030] Specifically, the dose adjustment unit 3 further includes a telescopic rod 33, which is installed in the temporary storage cavity 32 and extends and retracts along the extension direction of the temporary storage cavity 32; The dose adjustment unit 3 includes a first state and a second state. When the dose adjustment unit 3 is in such a state... Figure 4As shown, in the first state, the telescopic rod 33 extends out of the temporary storage cavity 32 and into the dosage channel 31. The temporary storage cavity 32 is not connected to the dosage channel 31. At this time, after the molten material enters the dosage channel 31, it is blocked by the telescopic rod 33 entering the dosage channel 31. The amount of molten material extruded from the dosage channel 31 is reduced. A small amount of molten material enters the extrusion module 2 and is blow-molded. This is suitable for blow molding of hollow parts with thin walls and does not require a large amount of molten material to be extruded. like Figure 5 As shown, when the dosage adjustment unit 3 is in the second state, the telescopic rod 33 retracts into the temporary storage cavity 32, which is connected to the dosage channel 31. At this time, the molten material extruded from the extrusion channel 11 completely enters the dosage channel 31 and then enters the extrusion module 2, increasing the dosage of the molten material entering the extrusion module 2. When there is a large amount of molten material entering the dosage channel 31, some of the molten material enters the temporary storage cavity 32 for storage and can be used for later use. When a larger amount of molten material is needed for blow molding of hollow parts during the blow molding process, the telescopic rod 33 extends and pushes the molten material in the temporary storage cavity 32 into the dosage channel 31, increasing the dosage of the molten material in the dosage channel 31 in time. A large amount of molten material enters the extrusion module 2, which can blow mold areas of hollow parts that require thicker walls to meet production needs.

[0031] In the dosage adjustment unit 3, the telescopic rod 33 is pressed into the dosage channel 31 to reduce the volume of the dosage channel 31 and reduce the dosage of molten material extruded by the dosage adjustment unit 3. When the dosage channel 31 is directly connected to the extrusion module 2 and the extrusion passage, a larger dose of molten material can be extruded into the extrusion module 2. The molten material entering the dosage channel 31 is stored in the temporary storage cavity 32. When the extrusion module 2 needs a larger dose of molten material, the telescopic rod 33 can push the molten material in the temporary storage cavity 32 into the dosage channel 31 to increase the dosage of molten material in the dosage channel 31. This provides good flexibility and meets different production needs. Compared with related technologies, adding a dosage adjustment mechanism to the extrusion module 2 results in a simpler structure and is easier to implement.

[0032] To ensure the smooth operation of the dosage adjustment unit 3, the dosage adjustment unit 3 further includes a telescopic cylinder 34. A connecting rod 37 is fixedly mounted on the drive shaft of the telescopic cylinder 34. The connecting rod 37 is fixedly connected to the telescopic rod 33. The telescopic rod 33 moves synchronously with the drive shaft of the telescopic cylinder 34. The dosage adjustment unit 3 also includes a limiting seat 35 for limiting the first extreme position of the connecting rod 37, and a proximity switch 36 for detecting the second extreme position of the connecting rod 37.

[0033] The dosage adjustment unit 3 has a cylinder 41 for mounting a dosage channel 31 and a cylinder 42 for mounting a telescopic rod 33. The cylinder 42 is mounted on the outside of the cylinder 41, and a temporary storage cavity 32 is located inside the cylinder 42. The cylinder 42 is connected to the cylinder 41 through the temporary storage cavity 32. The lower end of the telescopic rod 33 can reciprocate within the temporary storage cavity 32, and the upper end extends to the outside of the cylinder 42. A telescopic cylinder 34 is mounted outside the cylinder 42. The telescopic cylinder 34 and the cylinder 42 are both arranged in the same direction in the vertical direction. The drive shaft of the telescopic cylinder 34 is fixedly connected to the upper end of the telescopic rod 33 through a connecting rod 37. During the extension and retraction of the drive shaft of the telescopic cylinder 34, the telescopic rod 33 is synchronously driven to extend and retract up and down.

[0034] When the drive shaft of the telescopic cylinder 34 extends downward, the telescopic rod 33 is synchronously driven to extend downward in the temporary storage cavity 32. The lower end of the telescopic rod 33 enters the dosage channel 31 until the connecting rod 37 moves downward to the limit seat 35. When the connecting rod 37 moves to the limit position, the drive shaft of the telescopic cylinder 34 stops moving. At this time, the lower end of the telescopic rod 33 is located in the dosage channel 31, and the dosage adjustment unit 3 is in the first state. When the drive shaft of the telescopic cylinder 34 retracts upward, the telescopic rod 33 is synchronously driven to retract upward within the cylinder body 42 until the connecting rod 37 is detected by the proximity switch 36 during its upward movement. The connecting rod 37 moves to its limit position, and the drive shaft of the telescopic cylinder 34 stops moving. At this time, the temporary storage cavity 32 in the cylinder body 42 is connected to the dose channel 31, and the dose adjustment unit 3 is in the second state.

[0035] The movement position of the telescopic rod 33 can be controlled by the limit seat 35 and the proximity switch 36, thereby controlling the dosage of the dosage adjustment unit 3 under two extreme states, making the dosage adjustment range of the molten material controllable. At the same time, the telescopic cylinder 34, combined with the proximity switch 36 and controlled by a conventional controller (not shown in the figure), can easily realize automated control of the telescopic cylinder 34, which helps to improve the degree of automation.

[0036] like Figure 6 and Figure 7 As shown, to ensure that the molten material extruded from the outlet of the dosage channel 31 can enter the extrusion module 2 in a timely and uniform manner, especially when the extrusion module 2 has more than two extrusion heads 22, each extrusion head 22 needs an equal dose of molten material, an equalizing mechanism 5 is also connected to the outlet of the dosage channel 31. The equalizing mechanism 5 includes a delivery hose (not shown in the figure). The inlet end of the delivery hose is connected to the dosage channel 31, and the outlet end is connected to the feed channel of the extrusion module 2. The feed channel of the extrusion module 2 is the feed port 23 of the extrusion head 22.

[0037] When the extrusion module 2 includes multiple extrusion heads 22 and a feed hopper 21 connected to the multiple extrusion heads 22, the molten material extruded from the dosage channel 31 needs to re-enter the feed inlet 23 of each extrusion head 22 from the feed hopper 21. The equalization mechanism 5 is installed inside the feed hopper 21, such as... Figure 8 As shown, the equalization mechanism 5 includes a moving member 51 that drives the conveying hose to move. The moving member 51 clamps the outlet end of the conveying hose. The moving direction of the moving member 51 is the same as the arrangement direction of the plurality of extrusion heads 22, so that the moving member 51 reciprocates between each extrusion head 22, ensuring that the moving member 51 extrudes the molten material extruded from the outlet end of the conveying hose to each extrusion head 22.

[0038] The equalization mechanism 5 evenly delivers the molten material extruded from the dosage channel 31 to each extrusion head 22 in the extrusion module 2, so that the molten material extruded after the dosage adjustment unit 3 adjusts the dosage enters the feed port 23 of the extrusion head 22 evenly. The delivery is timely and accurate, ensuring the blow molding quality. It can simultaneously blow mold multiple hollow parts, ensuring that the product quality extruded from the extrusion head 22 is the same, and avoiding the impact on production quality caused by different dosages of molten material entering different extrusion heads 22.

[0039] Specifically, two corresponding clamping blocks 52 are fixedly installed on the moving component 51. Each clamping block 52 has an arc-shaped groove 521 for engaging and clamping the conveying hose. Only one clamping block 52 is shown in the figure; the other clamping block 52 is installed on the feed hopper 21, allowing the two clamping blocks 52 to cooperate with each other. This should be clearly understood by those skilled in the art. Simultaneously, the balancing mechanism 5 also has a fixed base 53 installed within the feed hopper 21. The fixed base 53 has a guide groove 531 for mounting the moving component 51. The extension direction of the guide groove 531 is the same as the arrangement direction of the multiple extrusion heads 22, ensuring that the moving component 51 moves between the extrusion heads 22 during its movement within the guide groove 531. In this embodiment, the fixing seat 53 is installed in the middle section of the feeding bin 21. The ends of the fixing seat 53 correspond to the extrusion head 22 on the inner side of the feeding bin 21. That is, when each extrusion head 22 is arranged from left to right in the horizontal direction in the extrusion module 2, the fixing seat 53 also extends from left to right in the feeding bin 21. The leftmost end of the fixing seat 53 can correspond to the extrusion head 22 at the leftmost position in the extrusion module 2, and the rightmost end of the fixing seat 53 can correspond to the extrusion head 22 at the rightmost position in the extrusion module 2, so as to ensure that each extrusion head 22 can be within the movement range corresponding to the moving part 51.

[0040] In this embodiment, the equalization mechanism 5 further includes a drive motor 54, a crank 55, and a connecting rod 56. One end of the connecting rod 56 is rotatably connected to the moving member 51, and the other end is connected to the crank 55. The drive part of the drive motor 54 is fixedly connected to the crank 55.

[0041] Two clamping blocks 52 can be used to clamp the outlet end of the conveying hose through the arc groove 521, so that the outlet end of the conveying hose is fixed with the moving part 51. This ensures that the conveying hose can move synchronously during the movement of the moving part 51, and the molten material extruded from the outlet of the conveying hose can enter each extrusion head 22 in sequence. This can overcome the problem in the prior art that the free flow of molten material in the feed hopper 21 can easily lead to differences in the amount of molten material received by each extrusion head 22.

[0042] The crank 55 rotates under the action of the drive motor 54, pulling the connecting rod 56 to rotate synchronously, causing the moving part 51 to reciprocate within the mounting base. The moving part 51 is connected by the crank 55 and the connecting rod 56, which is convenient. The drive motor 54 can rotate in one direction, and the moving speed of the moving part 51 can be adjusted by adjusting the speed of the drive motor 54, making control simple. Moreover, the overall structure is small in size and easy to install.

[0043] In addition, a guide roller 57 is installed in the fixed base 53. The guide roller 57 is connected to the rotating shaft of the moving member 51. The guide roller 57 and the moving member 51 move synchronously along the extension direction of the guide groove 531.

[0044] The guide roller 57 moves within the guide groove 531, improving the guiding effect, ensuring the smooth operation of the moving block, and improving the moving accuracy of the moving block.

[0045] During use, according to the wall thickness requirements of different areas in the blow molding process of hollow parts, when the molten material extruded from the extrusion channel 11 passes through the dosage adjustment unit 3, the telescopic cylinder 34 drives the telescopic rod 33 to extend and retract. When a smaller dose of molten material is needed to enter the extrusion module 2, the drive rod of the telescopic cylinder 34 extends, simultaneously pushing the telescopic rod 33 into the dosage channel 31 within the cylinder 42, so that the end of the telescopic rod 33 enters the dosage channel 31, reducing the volume of the dosage channel 31, thus reducing the dose of molten material extruded from the dosage channel 31. When a larger dose of molten material is needed to enter the extrusion module 2, the drive rod of the telescopic cylinder 34 retracts, simultaneously pushing the telescopic rod 33 into the cylinder 42, so that a temporary storage cavity 32 communicating with the dosage channel 31 is formed within the cylinder 42. A large dose of molten material can be transported and extruded in the dosage channel 31, making it convenient for the extrusion module 2 to receive a larger amount of molten material, which can adapt to blow molding of thicker hollow parts.

[0046] After the molten material enters the extrusion module 2, in order to ensure that each extrusion head 22 receives an equal amount of molten material, a conveying hose is installed at the outlet of the dosage channel 31. The outlet end of the conveying hose is installed on the moving part 51. The moving part 51 moves back and forth between each extrusion head 22 in the feed hopper 21, so that the molten material extruded by the conveying hose is conveyed and extruded towards each extrusion head 22. This ensures that the quality of the molten material between each extrusion head 22 remains uniform, avoids dosage differences between the molten material between each extrusion head 22, and allows multiple extrusion heads 22 in the extrusion module 2 to extrude multiple hollow parts simultaneously, ensuring product consistency and guaranteeing product quality.

[0047] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A blow molding apparatus for hollow plastic parts, comprising an apparatus body (1) and an extrusion module (2), wherein the apparatus body (1) is provided with an extrusion channel (11), and the extrusion module (2) is disposed at the outlet of the extrusion channel (11) and connected to the extrusion channel (11), characterized in that, A dose adjustment unit (3) is provided between the device body (1) and the extrusion module (2); the dose adjustment unit (3) includes a dose channel (31), one end of which is connected to the extrusion channel (11) and the other end of which is connected to the extrusion module (2); the dose adjustment unit (3) includes a temporary storage cavity (32) connected to the dose channel (31); the dose adjustment unit (3) also includes a telescopic rod (33), which is installed in the temporary storage cavity (32) and extends and retracts along the extension direction of the temporary storage cavity (32); the dose adjustment unit (3) includes a first state and a second state. When the dose adjustment unit (3) is in the first state, the telescopic rod (33) extends out of the temporary storage cavity (32) and into the dose channel (31), and the temporary storage cavity (32) is not connected to the dose channel (31); When the dose adjustment unit (3) is in the second state, the telescopic rod (33) retracts into the temporary storage cavity (32), and the temporary storage cavity (32) is connected to the dose channel (31).

2. The blow molding equipment according to claim 1, characterized in that, The dosage adjustment unit (3) further includes a telescopic cylinder (34), on which a connecting rod (37) is fixedly mounted. The connecting rod (37) is fixedly connected to the telescopic rod (33), and the telescopic rod (33) moves synchronously with the drive shaft of the telescopic cylinder (34). The dosage adjustment unit (3) further includes a limiting seat (35) for limiting the first extreme position of the connecting rod (37), and a proximity switch (36) for detecting the second extreme position of the connecting rod (37). When the dosage adjustment unit (3) is in the first state, the connecting rod (37) abuts against the limiting seat (35). When the dosage adjustment unit (3) is in the second state, the proximity switch (36) detects the connecting rod (37).

3. The blow molding equipment according to claim 1, characterized in that, The outlet of the dosage channel (31) is also connected to a balancing mechanism (5), which includes a delivery hose. The inlet end of the delivery hose is connected to the dosage channel (31), and the outlet end is connected to the feed channel of the extrusion module (2).

4. The blow molding equipment according to claim 3, characterized in that, The extrusion module (2) includes multiple extrusion heads (22) and a feed hopper (21) in which the multiple extrusion heads (22) are connected. The equalization mechanism (5) is installed in the feed hopper (21). The equalization mechanism (5) includes a moving part (51) that drives the conveying hose to move. The moving part (51) clamps the outlet end of the conveying hose. The moving direction of the moving part (51) is the same as the arrangement direction of the multiple extrusion heads (22).

5. The blow molding equipment according to claim 4, characterized in that, Two corresponding clamping blocks (52) are fixedly installed on the movable part (51), and each clamping block (52) is provided with an arc-shaped groove (521) for fitting and clamping the delivery hose.

6. The blow molding equipment according to claim 4, characterized in that, The balancing mechanism (5) includes a fixed seat (53) installed in the feed hopper (21), and the fixed seat (53) is provided with a guide groove (531) for installing the moving part (51). The extension direction of the guide groove (531) is the same as the arrangement direction of the plurality of extrusion heads (22). The balancing mechanism (5) also includes a drive motor (54), a crank (55) and a connecting rod (56). One end of the connecting rod (56) is rotatably connected to the moving part (51), and the other end is connected to the crank (55). The drive part of the drive motor (54) is fixedly connected to the crank (55).

7. The blow molding equipment according to claim 6, characterized in that, The fixed base (53) is also equipped with a guide roller (57), which is connected to the rotating shaft of the moving part (51). The guide roller (57) and the moving part (51) move synchronously along the extension direction of the guide groove (531).

8. The blow molding equipment according to claim 6, characterized in that, The fixed seat (53) is installed in the middle section of the feed hopper (21), and the two ends of the fixed seat (53) correspond to the two outermost extrusion heads (22) inside the feed hopper (21).

Images