Hollow blow molding die structure for independently controlling wall thickness

Abstract

The application discloses a hollow blow molding die head structure capable of independently controlling wall thickness and belongs to the technical field of blow molding machines. The structure comprises a wall thickness control mechanism and a die head body, the wall thickness control mechanism is arranged above the die head body and is connected with the die head body, and the structure is characterized in that: the wall thickness control mechanism is composed of first and second wall thickness control devices which are parallel to each other; the die head body is composed of first and second die head mechanisms which are parallel to each other; the two wall thickness control devices are fixed on a rack connecting plate of a blow molding machine and extend downward to correspond to the two die head mechanisms respectively; when the adjusting widths of the two devices corresponding to the melt flow channels are different, the wall thicknesses of the hollow containers after blow molding are different; and when the adjusting widths are the same, the wall thicknesses of the containers are consistent. The two sets of independent wall thickness control devices are integrated on the same rack connecting plate, the products with the same wall thickness or different wall thicknesses can be simultaneously produced under the premise of not interfering with each other, the integrated degree is high, the equipment investment and energy consumption can be reduced, the production site occupation can be reduced, the inspection and maintenance and material flow distance can be shortened, one person can operate two machines, and the labor cost can be saved.

Description

Technical Field

[0001] This invention belongs to the field of blow molding machinery technology, specifically relating to a hollow blow molding die head structure with independently controllable wall thickness. Background Technology

[0002] Numerous technical information related to the die head structure for blowing hollow plastic containers can be found in publicly available Chinese patent documents, such as CN101628472A (Hollow Blow Molding Die Head) and CN106003665A (Double-Layer Guided Material Storage Die Head Device for Blow Molding Machine). A typical example is the "Die Head Structure for Blowing Hollow Plastic Containers with Transparent Liquid Level Lines or Colored Stripes" published in document A.CN106863757A.

[0003] The aforementioned document A describes a single-die integrated co-extrusion structure that solves the problem of simultaneously forming transparent liquid level lines with colored stripes on the outer wall of a container of a single specification. Since the entire equipment only extrudes preforms of the same wall thickness, only one melt wall thickness adjustment drive mechanism is set up. All flow channels and dies share the same thickness adjustment system, and the wall thickness of all products changes synchronously.

[0004] A full reading of the instruction manual for document A reveals the following shortcomings: First, it cannot simultaneously produce two products with different wall thicknesses, and it does not provide corresponding technical guidance. Second, to meet the requirements for producing hollow plastic containers with different wall thicknesses, two complete blow molding machines are needed. These two machines require two independent frames, two operating platforms, two electrical control systems, two extrusion main units, and two safety protection facilities, which is neither cost-effective nor resource-efficient. Third, using two complete blow molding machines requires twice the floor space. Fourth, the need for two complete blow molding machines necessitates two operators, wasting valuable labor resources and increasing labor costs. Summary of the Invention

[0005] The objective of this invention is to provide a hollow blow molding die head structure that facilitates the connection of two independent wall thickness control devices to the same blow molding machine frame fixed connection plate, thereby meeting the requirement of simultaneously producing hollow plastic containers with different or the same wall thickness without interference. This structure is beneficial for achieving ideal integration, thus saving equipment investment costs and resources. It also significantly reduces the space occupied in the product manufacturing site, effectively freeing up production space and shortening the distance of daily maintenance and material flow. Furthermore, it facilitates a one-person-two-machine operation mode, saving valuable labor resources and reducing labor costs.

[0006] The objective of this invention is achieved by providing a hollow blow molding die head structure with independently controllable wall thickness, comprising a wall thickness control mechanism and a die head body. The wall thickness control mechanism is located above and connected to the die head body. The wall thickness control mechanism includes a first wall thickness control device and a second wall thickness control device. The die head body includes a first die head mechanism and a second die head mechanism, which are arranged parallel to each other front and back. The first and second wall thickness control devices are arranged parallel to each other front and back on a fixed connecting plate of the blow molding machine frame and extend downwards to the blow molding machine body. The frame fixing connecting plate is connected to the first mold head mechanism and the second mold head mechanism respectively. When the width of the melt flow channel of the first mold head mechanism and the second mold head mechanism adjusted by the first wall thickness control device and the second wall thickness control device are different, the wall thickness of the hollow plastic container blown by the blow molding mechanism of the blow molding machine from the melt from the first and second mold head mechanisms is different. When the width of the melt flow channel of the first mold head mechanism and the second wall thickness control device are the same, the wall thickness of the hollow plastic container blown by the blow molding mechanism of the blow molding machine from the melt from the first and second mold head mechanisms is the same.

[0007] In a specific embodiment of the present invention, the structure of the first wall thickness control device is the same as that of the second wall thickness control device; the structure of the first die head mechanism is the same as that of the second die head mechanism.

[0008] In another specific embodiment of the present invention, the second wall thickness control device includes a mold sleeve adjusting seat drive cylinder, a mold sleeve adjusting seat drive cylinder column baffle, a wall thickness control plate, an electronic ruler, an upper limit nut, a lower limit nut, and a limit nut lifting and limiting guide rod. The mold sleeve adjusting seat drive cylinder is fixed to the upward-facing side of the blow molding machine frame fixed connecting plate. The lower end of the mold sleeve adjusting seat drive cylinder column passes downward through a cylinder column clearance hole opened on the blow molding machine frame fixed connecting plate and is fixed to the lower end of the cylinder column through the fixed connecting seat. The lower end of the cylinder column is fixed to the connecting seat screw and the tie rod fixing seat. The tie rod fixing seat is connected to the second mold head mechanism through a set of tie rods arranged in a grid pattern. The upper end of the mold sleeve adjusting seat drive cylinder column extends above the mold sleeve adjusting seat drive cylinder. The middle part of the mold sleeve adjusting seat drive cylinder column baffle in the length direction is fixed to the upper end face of the mold sleeve adjusting seat drive cylinder column by the baffle fixing screw. A limit guide rod clearance hole is opened at the left end of the mold sleeve adjusting seat drive cylinder column baffle. The wall thickness control plate is fixed to the wall thickness control plate freeing column screw. The upper end of a set of wall thickness control plate levitation columns, and the lower end of the set of wall thickness control plate levitation columns are fixed to the top of the cylinder body of the mold sleeve adjustment seat drive cylinder. The upper end of the mold sleeve adjustment seat drive cylinder column passes upward through the wall thickness control plate cylinder column clearance hole opened on the wall thickness control plate. The lower end of the electronic ruler is fixed to the electronic ruler fixing plate in a state of contact with the upward-facing side of the mold sleeve adjustment seat drive cylinder column baffle. The lower end of the electronic ruler fixing plate is fixed to the wall thickness control plate. The upper limit nut and the lower limit nut correspond to the wall thickness control plate respectively. The lower and upper positions are threadedly fixed to the upper end of the drive cylinder thread section of the mold sleeve adjusting seat drive cylinder column. The lower end of the limit nut lifting limit guide rod cooperates with the upper limit nut positioning groove formed on the periphery of the upper limit nut and the lower limit nut positioning groove formed on the periphery of the lower limit nut. The upper end extends through the limit guide rod clearance hole to the upper part of the mold sleeve adjusting seat drive cylinder column baffle. The middle part is locked to the wall thickness control plate by the lifting limit guide rod screw. The mold sleeve adjusting seat drive cylinder is a hydraulic cylinder.

[0009] In another specific embodiment of the present invention, a first scale line material extrusion mechanism for forming scale lines on the wall of a blow-molded hollow plastic container is connected to the first die head mechanism, and a second scale line material extrusion mechanism for forming scale lines on the wall of a blow-molded hollow plastic container is connected to the second die head mechanism, and the structures of the first and second scale line material extrusion mechanisms are the same.

[0010] In another specific embodiment of the present invention, the second die head mechanism includes a feeding die base fixing plate, an upper feeding die base, a lower feeding die base, a flow divider column, a flow divider plate, a flow divider plate seat, a die head inner core guide, a die head seat, and a die head. The feeding die base fixing plate is fixed to the upper feeding die base at a position corresponding to the lower part of the tie rod fixing seat and between the upper feeding die base by feeding die base fixing plate screws. A guide post is fixed longitudinally at each of the four corners on the upward-facing side of the feeding die base fixing plate. The upper end of the guide post is fixed to the blow molding machine frame fixing connecting plate. The tie rod fixing seat and the middle part of the guide post form a sliding pair. The upper feeding die base is located above the lower feeding die base and is fixed to the lower feeding die base by upper feeding die base fixing screws. The middle portions of opposite sides of the lower feed die set together form a main plastic melt cavity. A main plastic melt outlet channel is longitudinally formed on the lower feed die set. The upper part of this channel communicates with the main plastic melt cavity, and the lower end is aligned with and communicates with the feed channel of the splitter column. A main plastic melt conveying connector is fixed on the right side, corresponding to both the upper and lower feed die sets. This connector communicates with the main plastic melt cavity. In operation, the connector is connected to the screw extruder. The splitter column is positioned between the lower feed die set and the splitter plate, and a main plastic melt guide cavity is formed on this column. The upper part of the melt guiding cavity communicates with the feed channel of the dividing column. The dividing plate is disposed between the lower surface of the dividing column and the dividing plate seat. The dividing plate seat is disposed between the dividing plate and the opposing side of the dividing plate support ring. A die head inner core cavity is formed at the center of the dividing plate seat. A die head inner core is disposed in the die head inner core cavity. The lower end of the die head inner core extends to the bottom of the dividing plate seat and the dividing plate support ring and connects to the upper end of the die. The die head inner core guide and the dividing plate form an integral structure. The upper end of the die head inner core guide extends above the dividing plate and penetrates into the main plastic melt guiding cavity. The middle outer wall of the die head inner core guide forms a grid-like integral connection with the center of the dividing plate. The space between the inner walls of the distribution plate forms a main plastic melt guiding channel that communicates with the main plastic melt guiding cavity. The lower end of the die core guide extends below the main plastic melt guiding channel and mates with the upper center of the die core, and is fixed by a die core reinforcing connecting screw. The space between the upper outer wall of the die core and the wall of the die core clearance hole at the center of the distribution plate seat forms a main plastic melt feeding channel. A support ring guide sleeve is provided on the support ring of the distribution plate seat. The lower end of the die core extends into the support ring guide sleeve, and the space between the outer wall of the die core and the inner wall of the support ring guide sleeve forms a support ring guide sleeve melt channel. The main plastic melt feeding channel communicates with the main plastic melt guiding channel.The die holder is located below the distribution plate support ring, and the die is located within the die holder cavity. The upper end of the die is threadedly connected to the lower end of the die head inner core. The lower ends of the set of grid-shaped tie rods are connected to the die holder. The space between the outer wall of the die and the cavity wall of the die sleeve forms a die melt outlet channel, which communicates with the melt outlet channel of the support ring guide sleeve. The second-scale line extrusion mechanism is fitted to the distribution plate and communicates with the main plastic melt feed channel.

[0011] In another specific embodiment of the present invention, a melt flow rate control column adjusting screw seat is fixed on the lower feed mold base and located on the left side. A melt flow rate control column adjusting screw is screwed onto the melt flow rate control column adjusting screw seat. A melt flow rate control column is fixed to the right end of the melt flow rate control column adjusting screw. The melt flow rate control column slides into a melt flow rate control column hole opened on the lower feed mold base and communicates with the main plastic melt outlet channel of the lower feed mold base. Rotating the melt flow rate control column adjusting screw clockwise or counterclockwise can change the degree to which the melt flow rate control column enters or exits the main plastic melt outlet channel of the lower feed mold base, and the melt channel of the main plastic melt outlet channel of the lower feed mold base becomes smaller or larger.

[0012] In a further specific embodiment of the present invention, a compressed air inlet hole for the die core guide is formed at the lower center of the die core guide. A central vent hole for the screw is formed at the longitudinal center of the die core reinforcing connecting screw, corresponding to and communicating with the compressed air inlet hole for the die core guide. The central vent hole for the screw communicates with a vent cavity for the die core formed at the lower center of the die core, and the vent cavity for the die core communicates with a central hole for the die, which is longitudinally formed at the center of the die. An air blowing pipe is attached to the side of the distribution plate. One end of the air blowing pipe facing the distribution plate communicates with the compressed air inlet hole for the die core guide through a vent channel formed on the distribution plate. The other end of the air blowing pipe away from the distribution plate is connected to a compressed air supply device pipeline in use. The upper end of the die core guide is bullet-shaped. The compressed air supply device is an air compressor.

[0013] In a further specific embodiment of the present invention, a scale guide ring is fixedly fitted at the middle of the inner core of the die head via a scale guide ring fixing screw. A scale material groove recessed into the surface of the scale guide ring is formed on the outer wall of the scale guide ring. A scale material inlet hole is formed in the scale material groove and at one end of the scale material groove. The scale material inlet hole communicates with the main plastic melt feeding channel. The second scale material extrusion mechanism is engaged with the distribution plate seat at the position corresponding to the scale guide ring and communicates with the scale material groove. The middle part of the second scale material extrusion mechanism is fixed to the left side of the blow molding machine frame fixing connection plate.

[0014] In yet another specific embodiment of the present invention, a sliding sleeve is fixed at the center of the die holder by a sliding sleeve fixing screw, and the lower end of the support ring guide sleeve extends into the sliding sleeve cavity of the sliding sleeve and forms a sliding pair relationship with the sliding sleeve cavity wall; a die holder support ring is fixed at the bottom of the die holder by a die holder support ring fixing screw, and a die holder support flange is provided on the upper part of the die holder and extending outward around the circumference of the die holder, and the die holder support flange is supported on the die holder support ring.

[0015] In yet another specific embodiment of the present invention, a graduated wire material discharge sleeve mating cavity is formed on the left side of the distribution plate seat and at a position corresponding to the graduated wire guide ring. A graduated wire material inlet is formed in the center of the graduated wire material discharge sleeve mating cavity, and the graduated wire material inlet communicates with the graduated wire material inlet hole. The second graduated wire material extrusion mechanism includes an extrusion motor, an extrusion gearbox, a fixed mounting base, a graduated wire material melt extrusion screw barrel, a graduated wire material melt extrusion screw, a graduated wire material discharge cylinder seat, and a feeding cylinder. The extrusion motor is located above the extrusion gearbox and is driven by the extrusion gearbox. The extrusion gearbox is fixed to the upper part of the fixed mounting base. The final stage power output shaft of the extrusion gearbox extends downward into the upper cavity of the fixed mounting base. The lower part of the fixed mounting base forms a lower cavity. The fixed mounting base is fixed to the fixed mounting base bracket, which is fixed to the left side of the blow molding machine frame fixed connection plate by fixed mounting base bracket screws. The upper end of the graduated wire material melt extrusion screw barrel is fixed to the lower part of the fixed mounting base, while the lower end of the graduated wire material melt extrusion screw barrel is fixed to the upper part of the graduated wire material discharge cylinder seat by a screw barrel fixing seat. The graduated wire material melt extrusion screw is set inside the graduated wire material melt extrusion screw barrel, and the upper end of the graduated wire material melt extrusion screw is fixed to the upper part of the fixed mounting base. The screw seat is fixed inside the mounting base. The upper end of the screw seat is located within the upper cavity of the fixed mounting base and is connected to the final stage power output shaft of the extrusion gearbox via a screw seat rotatable connecting nut. A screw seat rotatable support bearing is provided on the screw seat, corresponding to positions in the upper and lower cavities of the fixed mounting base, respectively. A graduated material discharge cylinder extends to the right side of the graduated material discharge cylinder seat. The right end of this graduated material discharge cylinder is fixed to the distributor plate seat via a set of discharge cylinder fixing screws at a position corresponding to the graduated material discharge sleeve mating cavity. The graduated material discharge port of the graduated material discharge cylinder mates with and communicates with the graduated material inlet. A screw barrel fixing seat passage hole is provided on the screw barrel fixing seat at the lower end of the scale line material melt extrusion screw. A scale line material discharge cylinder seat passage hole communicating with the screw barrel fixing seat passage hole is provided on the scale line material discharge cylinder seat at the position corresponding to the screw barrel fixing seat passage hole. A scale line molten material outlet hole is provided on the scale line material discharge cylinder, with its left end communicating with the scale line material discharge cylinder seat passage hole and its right end communicating with the scale line material discharge port. The feed cylinder is fixed to the scale line material melt extrusion screw barrel at the position corresponding to the extrusion screw barrel inlet provided at the upper end of the scale line material melt extrusion screw barrel through its lower feed cylinder outlet pipe.

[0016] The technical solution provided by this invention, because the wall thickness control mechanism is composed of first and second wall thickness control devices, and the die head body is composed of first and second die head mechanisms, ensures that when the widths of the melt flow channels of the first and second die head mechanisms are adjusted differently by the first and second wall thickness control devices, the wall thicknesses of the hollow plastic containers blown by the blow molding mechanism of the blow molding machine from the melt of the first and second die head mechanisms will be different, and vice versa. Therefore, it is helpful to connect two independent sets of first and second wall thickness control devices to the same blow molding machine frame fixed connection plate to meet the requirement of simultaneously producing hollow plastic containers with different or the same wall thicknesses without interference; it is beneficial to achieve ideal integration, thereby saving equipment investment costs and resources; it is beneficial to significantly reduce the space occupied in the product manufacturing area, thereby effectively freeing up production space and shortening the daily maintenance and material flow distance; and it facilitates a one-person-two-machine operation mode, thereby saving valuable labor resources and reducing labor costs. Attached Figure Description

[0017] Figure 1 This is a structural diagram of an embodiment of the present invention; Figure 2 for Figure 1 Enlarged view of part A; Figure 3 for Figure 1 A sectional view; Figure 4 for Figure 3 The diagram shows a detailed structural diagram of the scale-marked splitter ring.

[0018] In the diagram: 1. Wall thickness control mechanism; 11. First wall thickness control device; 12. Second wall thickness control device; 121. Mold sleeve adjusting seat drive cylinder; 1211. Mold sleeve adjusting seat drive cylinder column; 12111. Lower end fixed connecting seat of cylinder column; 12112. Tie rod fixing seat; 12113. Tie rod; 12114. Drive cylinder column threaded section; 12115. Lower end fixed connecting seat screw of cylinder column; 122. Mold sleeve adjusting seat drive cylinder column baffle; 1221. Baffle fixing screw; 1222. Limiting guide rod clearance hole; 123. Wall thickness control plate; 1231. Wall thickness control plate levitation column; 12311. Wall thickness control plate levitation column screw; 1232. Wall thickness control plate cylinder column clearance hole; 124. Electronic ruler; 1241. Electronic ruler fixing plate; 125. 1. Upper limit nut, 1251. Upper limit nut positioning slot, 126. Lower limit nut, 1261. Lower limit nut positioning slot, 127. Limit nut lifting and lowering guide rod, 1271. Lifting and lowering guide rod screw; 2. Die head body, 21. First die head mechanism, 22. Second die head mechanism, 221. Feed die base fixing plate, 2211. Feed die base fixing plate screw, 2212. Guide column, 222. Upper feed die base, 2221. Upper feed die base fixing screw, 223. Lower feed die base, 2231. Die base main plastic melt cavity, 2232. Lower feed die base main plastic melt outlet channel, 2233. Main plastic melt conveying connector, 2234. Melt flow rate control column adjusting screw seat, 22341. Melt flow rate control column adjusting screw, 22342. 2235. Melt flow rate control column, 224. Flow divider column, 2241. Flow divider column inlet channel, 2242. Main plastic melt guide cavity, 225. Flow divider plate, 2251. Main plastic melt guide channel, 2252. Air blowing pipe, 2253. Flow divider plate vent, 226. Flow divider plate seat, 2261. Flow divider plate seat support ring, 22611. Support ring guide sleeve, 22612. Support ring guide sleeve melt channel, 2262. Die head inner core, 22621. Die head inner core vent cavity, 22622. Scale guide ring, 22623. Scale guide ring fixing screw, 22624. Scale material groove, 22625. Scale material inlet hole, 22626. 22627. Screw boss cavity; 2263. Main plastic melt feed channel; 2264. Scale line material outlet sleeve mating cavity; 22641. Scale line material inlet; 227. Die head inner core guide; 2271. Die head inner core reinforcing connecting screw; 22711. Screw central vent hole; 2272. Die head inner core guide compressed air inlet hole; 228. Die holder; 2281. Sliding sleeve; 22811. Sliding sleeve fixing screw; 2282.1. Die sleeve support ring; 22821. Die sleeve support ring fixing screw; 229. Die; 2291. Die sleeve; 22911. Die sleeve support flange edge; 2292. Die sleeve melt outlet channel; 2293. Die sleeve center hole; 3. First scale line material extrusion mechanism; 4. Second scale line material extrusion mechanism; 41. Extrusion motor; 42. Extrusion gearbox; 43. Fixed mounting base; 431. Upper cavity of fixed mounting base; 432. Lower cavity of fixed mounting base; 44. Scale line material melt extrusion screw barrel; 441. Screw barrel fixing base; 4411. Screw barrel fixing base material passage hole; 442. Extrusion screw barrel inlet; 45. Scale line material melt extrusion screw; 451. Screw seat; 4511. Screw seat rotating connection nut; 4512. Screw seat rotating support bearing; 46. 461. Scale line material discharge cylinder seat; 4611. Discharge cylinder fixing screw; 4612. Scale line material discharge port; 4613. Scale line molten material lead-out hole; 462. Scale line material discharge cylinder seat through hole; 47. Feed cylinder; 471. Feed cylinder discharge pipe; 48. Fixed mounting bracket; 481. Fixed mounting bracket screw; 10. Blow molding machine frame fixed connecting plate; 101. Cylinder column clearance hole; 102. Fixed connecting plate hole; 103. Screw fixing hole. Detailed Implementation

[0019] In order to better understand the technical essence and beneficial effects of the present invention, the applicant provides a detailed description below by way of embodiments. However, the description of the embodiments is not intended to limit the present invention. Any formal but not substantive equivalent transformations made based on the concept of the present invention should be considered within the scope of the present invention.

[0020] In the following description, all directional or positional concepts involving up, down, left, right, front, and back are based on the current position. Figure 1 The location and state of the object are examples, and therefore should not be construed as a special limitation on the technical solution provided by the present invention.

[0021] Please see Figure 1 The diagram shows a wall thickness control mechanism 1 and a mold head body 2, wherein the wall thickness control mechanism 1 is located above the mold head body 2 and is connected to the mold head body 2.

[0022] The key technical points of the technical solution provided by this invention are as follows: The aforementioned wall thickness control mechanism 1 includes a first wall thickness control device 11 and a second wall thickness control device 12; the aforementioned mold head body 2 includes a first mold head mechanism 21 and a second mold head mechanism 22. The first mold head mechanism 21 and the second mold head mechanism 22 are arranged parallel to each other front and back. The first wall thickness control device 11 and the second wall thickness control device 12 are arranged parallel to each other front and back on the blow molding machine frame fixed connecting plate 10 and extend downward to the bottom of the blow molding machine frame fixed connecting plate 10, respectively connecting to the aforementioned first mold head mechanism 21 and second mold head mechanism 22. When the first wall thickness control device 11 and the second mold head mechanism 22 are connected, the wall thickness control device 11 and the second mold head mechanism 22 are connected. When the widths of the melt channels of the first and second mold head mechanisms 21 and 22 adjusted by the two wall thickness control devices 12 are different (i.e., the width adjustment of the melt channels, the same below), the wall thicknesses of the hollow plastic containers blown by the blow molding mechanism of the blow molding machine from the melts of the first and second mold head mechanisms 21 and 22 are different. When the widths of the melt channels of the first and second mold head mechanisms 21 and 22 adjusted by the first and second wall thickness control devices 11 and 12 are the same (i.e., the width adjustment of the melt channels, the same below), the wall thicknesses of the hollow plastic containers blown by the blow molding mechanism of the blow molding machine from the melts of the first and second mold head mechanisms 21 and 22 are the same.

[0023] Since the structure of the aforementioned first wall thickness control device 11 (also referred to as the "rear wall thickness control device", hereinafter the same) is the same as the structure of the aforementioned second wall thickness control device 12 (also referred to as the "front wall thickness control device", hereinafter the same); and the structure of the aforementioned first mold head mechanism 21 is the same as the structure of the aforementioned second mold head mechanism 22, the applicant will only describe the second wall thickness control device 12 and the second mold head mechanism 22 in detail below.

[0024] Please see Figures 1 to 3 The aforementioned second wall thickness control device 12 includes a mold sleeve adjusting seat drive cylinder 121, a mold sleeve adjusting seat drive cylinder column baffle 122, a wall thickness control plate 123, an electronic ruler 124, an upper limit nut 125, a lower limit nut 126, and a limit nut lifting and limiting guide rod 127. The mold sleeve adjusting seat drive cylinder 121 is fixed on the upward-facing side of the aforementioned blow molding machine frame fixed connecting plate 10. The lower end of the mold sleeve adjusting seat drive cylinder column 1211 of the mold sleeve adjusting seat drive cylinder 121 passes downward through the cylinder column clearance hole 101 opened on the blow molding machine frame fixed connecting plate 10. Figure 3(As shown) The lower end of the cylinder column is fixed to the connecting seat 12111 and the tie rod fixing seat 12112 by the cylinder column lower end fixed connecting seat screw 12115. The tie rod fixing seat 12112 is connected to the aforementioned second mold head mechanism 22 by a set of tie rods 12113 arranged in a grid pattern. The upper end of the mold sleeve adjusting seat drive cylinder column 1211 extends above the mold sleeve adjusting seat drive cylinder 121. The middle part of the mold sleeve adjusting seat drive cylinder column baffle 122 in the length direction is fixed to the upper end face of the mold sleeve adjusting seat drive cylinder column 1211 by the baffle fixing screw 1221. A limit guide rod clearance hole 1222 is opened at the left end of the mold sleeve adjusting seat drive cylinder column baffle 1222. The wall thickness control plate 123 is fixed to the upper end of a set of wall thickness control plate clearance columns 1231 by the wall thickness control plate clearance column screw 12311. The lower end of the wall thickness control plate levitation column 1231 is fixed to the top of the cylinder body of the mold sleeve adjustment seat drive cylinder 121. The upper end of the aforementioned mold sleeve adjustment seat drive cylinder column 1211 passes upward through the wall thickness control plate cylinder column clearance hole 1232 opened on the wall thickness control plate 123. The lower end of the electronic ruler 124 is fixed to the electronic ruler fixing plate 1241 in a state of contact with the upward side of the aforementioned mold sleeve adjustment seat drive cylinder column baffle 122. Specifically, it is fixed on the left side of the electronic ruler fixing plate 1241, and the lower end of the electronic ruler fixing plate 1241 is fixed to the wall thickness control plate 123. The upper limit nut 125 and the lower limit nut 126 are respectively located below and above the wall thickness control plate 123 and are connected to the upper end of the drive cylinder column thread section 12114 of the mold sleeve adjustment seat drive cylinder column 1211. Figure 3 (See diagram) The threaded fixing, the lower end of the lifting limit guide rod 127 of the limit nut cooperates with the upper limit nut positioning groove 1251 formed on the periphery of the upper limit nut 125 and the lower limit nut positioning groove 1261 formed on the periphery of the lower limit nut 126, while the upper end extends through the aforementioned limit guide rod relief hole 1222 to the top of the mold sleeve adjustment seat drive cylinder column baffle 122, and the middle part is locked with the wall thickness control plate 123 by the lifting limit guide rod screw 1271; the aforementioned mold sleeve adjustment seat drive cylinder 121 is a hydraulic cylinder.

[0025] By operating the upper and lower limit nuts 125 and 126, the upward or downward stroke of the mold sleeve adjusting seat drive cylinder 1211 is adjusted, causing the upward or downward stroke of the mold sleeve adjusting seat drive cylinder baffle 122 to change accordingly. This sends a signal to the electrical controller, which then feeds back the change in the displacement distance of the electronic ruler 124. The electrical controller then precisely changes and adjusts the wall thickness. During this process, the mold sleeve adjusting seat drive cylinder 1211 drives the pull rod fixing seat 12112 through its lower end fixed connecting seat 12111. The upward or downward movement of the pull rod fixing seat 12112 drives the mold sleeve 2291 (described later), thereby changing the width of the molten flow channel 2292 between the inner wall of the mold sleeve 2291 and the outer wall of the die 229, thus achieving the purpose of making the wall of the molded hollow plastic container thicker or thinner.

[0026] A first scale line extrusion mechanism 3 for forming scale lines on the wall of a blow-molded hollow plastic container is connected to the aforementioned first die head mechanism 21, and from... Figure 1 As shown in the diagram, since the first scale line extrusion mechanism 3 is located behind the second scale line extrusion mechanism 4, the first scale line extrusion mechanism 3 can also be called the rear scale line extrusion mechanism. Similarly, the second scale line extrusion mechanism 4 can also be called the front scale line extrusion mechanism. A second scale line extrusion mechanism 4 for forming scale lines on the wall of a blow-molded hollow plastic container is connected to the aforementioned second die head mechanism 22, and the structures of the aforementioned first and second scale line extrusion mechanisms 3 and 4 are identical.

[0027] Please pay attention. Figure 1 and Figure 3 The aforementioned second die head mechanism 22 includes a feed die holder fixing plate 221, an upper feed die holder 222, a lower feed die holder 223, a flow divider column 224, a flow divider plate 225, a flow divider plate seat 226, a die head inner core guide 227, a die holder 228, and a die 229. The feed die holder fixing plate 221 is located below the aforementioned tie rod fixing seat 12112 and between it and the upper feed die holder 222, and is connected to the upper feed die holder 222 by feed die holder fixing plate screws 2211. 22. Fixed: A guide post 2212 is fixed longitudinally at each of the four corners of the upward-facing side of the feed mold base fixing plate 221. The upper end of the guide post 2212 is fixed to the aforementioned blow molding machine frame fixing connecting plate 10. The aforementioned tie rod fixing seat 12112 and the middle part of the guide post 2212 form a sliding pair. The aforementioned upper feed mold base 222 is located above the lower feed mold base 223 and is connected to the lower feed mold base 223 by the upper feed mold base fixing screw 2221. Figure 3(As shown) A main plastic melt cavity 2231 is formed in the middle of the opposite side of the upper and lower feed mold bases 222 and 223. A main plastic melt outlet channel 2232 is also longitudinally formed on the lower feed mold base 223. The upper part of the lower feed mold base main plastic melt outlet channel 2232 communicates with the main plastic melt cavity 2231, and the lower end is aligned with and communicates with the feed channel 2241 of the diverter column 224. A main plastic melt conveying connector 2233 is fixed on the right side, corresponding to both the upper and lower feed mold bases 222 and 223. This main plastic melt conveying connector 2233 communicates with the aforementioned main plastic melt cavity 2231. In use, the aforementioned main plastic melt... The conveyor connector 2233 is connected to the screw extruder. The aforementioned diverter column 224 is disposed between the lower feed die holder 223 and the diverter plate 225. A main plastic melt guiding cavity 2242 is formed on the diverter column 224. The upper part of the main plastic melt guiding cavity 2242 communicates with the feed channel 2241 of the aforementioned diverter column. The diverter plate 225 is disposed between the lower surface of the diverter column 224 and the diverter plate seat 226. The diverter plate seat 226 is disposed between the diverter plate 225 and the opposite side of the diverter plate seat support ring 2261. A die head inner core cavity is formed at the center of the diverter plate seat 226. A die head inner core 2262 is disposed in the die head inner core cavity. The lower end of the die head inner core 2262 extends to the diverter plate seat 226 and the diverter plate seat support ring 2261. Below 261 and connected to the upper end of the aforementioned die 229, the inner core guide 227 of the die head and the flow divider 225 form an integral structure. The upper end of the inner core guide 227 extends above the flow divider 225 and penetrates into the aforementioned main plastic melt flow chamber 2242. The outer wall of the middle part of the inner core guide 227 forms a grid-like hollow integral connection with the center position of the flow divider 25. The space between the outer wall of the inner core guide 227 and the inner wall of the flow divider 225 forms a main plastic melt guide channel 2251 that communicates with the main plastic melt flow chamber 2242. The lower end of the inner core guide 227 extends below the main plastic melt guide channel 2251 and matches the upper center part of the aforementioned inner core 2262. The die head is fixed by a reinforcing connecting screw 2271. The space between the upper outer wall of the die head inner core 2262 and the wall of the die head inner core clearance hole at the center of the distribution plate seat 226 forms the main plastic melt feeding channel 2263. A support ring guide sleeve 22611 is provided on the aforementioned distribution plate seat support ring 2261. The lower end of the die head inner core 2262 extends into the support ring guide sleeve 22611, and the space between the outer wall of the aforementioned die head inner core 2262 and the inner wall of the support ring guide sleeve 22611 forms the support ring guide sleeve melt flow channel 22612. The aforementioned main plastic melt feeding channel 2263 communicates with the main plastic melt guide flow channel 2251. The die holder 228 is located below the aforementioned distribution plate seat support ring 2261.The die 229 is located within the die holder cavity of the die holder 228, and its upper end is threadedly connected to the lower end of the die head inner core 2262. The lower ends of the aforementioned set of grid-shaped tie rods 12113 are connected to the die holder 228. The space between the outer wall of the die 229 and the cavity wall of the die sleeve 2291 forms the die melt outlet channel 2292, which communicates with the aforementioned support ring guide sleeve melt outlet channel 22612. The aforementioned second scale line extrusion mechanism 4 is fitted with the aforementioned distribution plate seat 226 and communicates with the aforementioned main plastic melt feed channel 2263.

[0028] Since the structure of the die head body 2 of the present invention also includes a first die head mechanism 21, and since the structure of the first die head mechanism 21 is exactly the same as that of the second die head mechanism 22, the plastic melt introduced from the aforementioned main plastic melt conveying connector 2233 into the aforementioned die base main plastic melt cavity 2231 is divided into two paths at the entrance, i.e., at the right end of the die base main plastic melt cavity 2231, so as to supply the first die head mechanism 21 at the same time, thus satisfying the requirement of simultaneous material supply to the first and second die head mechanisms 21 and 22 by one main plastic melt conveying connector 2233.

[0029] See you later Figure 2 and Figure 3 On the aforementioned lower feed die holder 223 and located on the left side, there is a melt flow rate control column adjusting screw seat 2234, and a melt flow rate control column adjusting screw 22341 is screwed onto the melt flow rate control column adjusting screw seat 2234. The melt flow rate control column adjusting screw 22341 ( Figure 3 A melt flow rate control post 22342 is fixed at the right end of the device shown in the diagram. The melt flow rate control post 22342 is slidably engaged with the melt flow rate control post hole 2235 opened on the lower feed mold base 223 and communicates with the aforementioned main plastic melt outlet channel 2232 of the lower feed mold base. The degree to which the melt flow rate control post 22342 is inserted into or withdrawn from the main plastic melt outlet channel 2232 of the lower feed mold base can be changed by rotating the melt flow rate control post adjusting screw 22341 clockwise or counterclockwise. The melt channel of the main plastic melt outlet channel 2232 of the lower feed mold base becomes smaller or larger. More specifically, the melt flow rate flowing through the main plastic melt outlet channel 2232 of the lower feed mold base becomes smaller or larger.

[0030] A compressed air inlet hole 2272 is formed at the lower center of the aforementioned die core guide 227. A central vent hole 22711, corresponding to and communicating with the compressed air inlet hole 2272, is formed at the longitudinal center of the aforementioned die core reinforcing connecting screw 2271. The central vent hole 22711 communicates with the die core vent cavity 22621 formed at the lower center of the aforementioned die core 2262. The die core vent cavity 22621 communicates with the central part of the aforementioned die 229 which is opened longitudinally. The die is connected to the center hole 2293 at the position; an air blowing pipe 2252 is connected to the side of the aforementioned distribution plate 225. The end of the air blowing pipe 2252 facing the distribution plate 225 is connected to the compressed air inlet hole 2272 of the aforementioned die head inner core guide through the distribution plate air passage 2253 opened on the distribution plate 225, while the end of the air blowing pipe 2252 away from the distribution plate 225 is connected to the compressed air supply device pipeline in use; the upper end of the aforementioned die head inner core guide 227 is bullet-shaped; in this embodiment, the aforementioned compressed air supply device is preferably an air compressor.

[0031] Please see Figure 1 and Figure 3 as well as Figure 4 A scale guide ring 22622 is fixed in the middle of the inner core 2262 of the aforementioned die head by a scale guide ring fixing screw 22623. A scale guide ring groove 22624, which is recessed into the surface of the scale guide ring 22622 and is arc-shaped, is formed on the outer wall of the scale guide ring 22622. A scale guide ring inlet hole 22625 is opened in the scale guide ring groove 22624 and at one end of the scale guide ring groove 22624. The scale guide ring inlet hole 22625 communicates with the aforementioned main plastic melt feeding channel 2263. Figure 4 also shows a screw boss cavity 22626 formed on the scale guide ring 22622 and positioned corresponding to the scale guide ring fixing screw 22623. A screw boss 22627 formed on the left end face of the scale guide ring fixing screw 22623 cooperates with the screw boss cavity 22626. The aforementioned second scale material extrusion mechanism 4 is engaged with the aforementioned flow distribution plate seat 226 at the position corresponding to the aforementioned scale guide ring 22622 and communicates with the aforementioned scale material groove 22624. The middle part of the aforementioned second scale material extrusion mechanism 4 is fixed to the left side of the aforementioned blow molding machine frame fixing connecting plate 10.

[0032] exist Figure 1 The image also shows fixing connection plate holes 102 at the four corners of the rectangular blow molding machine frame fixing connection plate 10. In use, the blow molding machine frame fixing connection plate 10 is fixed to the blow molding machine frame by bolts at the positions corresponding to the fixing connection plate holes 102.

[0033] A sliding sleeve 2281 is fixed at the center of the aforementioned die holder 228 by a sliding sleeve fixing screw 22811. The lower end of the aforementioned support ring guide sleeve 22611 extends into the sliding sleeve cavity of the sliding sleeve 2281 and forms a sliding pair relationship with the sliding sleeve cavity wall of the sliding sleeve 2281. A die holder support ring 2282 is fixed at the bottom of the aforementioned die holder 228 by a die holder support ring fixing screw 22821. A die holder support flange edge 22911 is provided on the upper part of the aforementioned die holder 2291 and extends outward around the circumference of the die holder 2291. The die holder support flange edge 22911 is supported on the die holder support ring 2282.

[0034] On the left side of the aforementioned distribution plate seat 226 and at the position corresponding to the aforementioned scale line guide ring 22622, a scale line material discharge sleeve mating cavity 2264 is formed. A scale line material inlet 22641 is formed in the center of the scale line material discharge sleeve mating cavity 2264, and the scale line material inlet 22641 communicates with the aforementioned scale line material inlet hole 22625.

[0035] Please pay attention. Figure 1 and Figure 3 The aforementioned second scale line material extrusion mechanism 4 includes an extrusion motor 41, an extrusion gearbox 42, a fixed mounting base 43, a scale line material melt extrusion screw barrel 44, a scale line material melt extrusion screw 45, a scale line material discharge barrel seat 46, and a feeding barrel 47. The extrusion motor 41 is positioned above the extrusion gearbox 42 and is in transmission cooperation with the extrusion gearbox 42. The extrusion gearbox 42 is fixed to the upper part of the fixed mounting base 43. The final stage power output shaft of the extrusion gearbox 42 extends downward into the upper cavity 431 of the fixed mounting base 43. The lower part of the fixed mounting base 43 forms a lower cavity 432. The fixed mounting base 43 is fixed to a fixed mounting base bracket 48, and the fixed mounting base bracket 48 is fixed to the left side of the aforementioned blow molding machine frame fixed connecting plate 10 by fixed mounting base bracket screws 481. Figure 1The screw fixing holes 103 on the left side of the blow molding machine frame fixing connection plate 10 are clearly shown. The aforementioned fixing mounting bracket screws 481 are fixed to the left side of the blow molding machine frame fixing connection plate 10 at the positions corresponding to the screw fixing holes 103. The upper end of the graduated wire material melt extrusion screw barrel 44 is fixed to the lower part of the fixed mounting base 43, while the lower end of the graduated wire material melt extrusion screw barrel 44 is fixed to the upper part of the graduated wire material discharge barrel seat 46 through the screw barrel fixing seat 441. The graduated wire material melt extrusion screw 45 is disposed inside the graduated wire material melt extrusion screw barrel 44, and the upper end of the graduated wire material melt extrusion screw 45 is fixed to the screw seat 451 disposed inside the fixed mounting base 43. The upper end of the screw seat 451 is located inside the upper cavity 431 of the aforementioned fixed mounting base, and is driven by the screw seat rotatable connecting nut 4511 to the final stage power output shaft of the aforementioned extrusion gearbox. On the screw seat 451, there are respectively arranged at positions corresponding to the upper cavity 431 and the lower cavity 432 of the aforementioned fixed mounting base. There is a screw seat rotation support bearing 4512. A scale line material discharge cylinder 461 extends to the right side of the scale line material discharge cylinder seat 46. The right end of the scale line material discharge cylinder 461 is fixed to the aforementioned diverter plate seat 226 by a set of discharge cylinder fixing screws 4611 at the position corresponding to the aforementioned scale line material discharge sleeve mating cavity 2264. The scale line material discharge port 4612 of the scale line material discharge cylinder 461 is mated with and communicates with the aforementioned scale line material inlet 22641. Specifically, the molten scale line material led out from the scale line material discharge port 4612 first enters the aforementioned scale line material groove 22624, and is introduced into the lower part of the aforementioned main plastic melt feeding channel 2263 through the scale line material inlet hole 22625 at one end of the scale line material groove 22624. A screw barrel fixing seat passage hole 4411 is provided on the aforementioned screw barrel fixing seat 441 at the lower end of the scale line material melt extrusion screw 45. A scale line material discharge cylinder seat passage hole 462 communicating with the screw barrel fixing seat passage hole 4411 is provided on the aforementioned scale line material discharge cylinder seat 46 at the position corresponding to the screw barrel fixing seat passage hole 4411. A scale line molten material lead-out hole 4613 is provided on the scale line material discharge cylinder 461, with its left end communicating with the scale line material discharge cylinder seat passage hole 462 and its right end communicating with the aforementioned scale line material discharge port 4612. The feed cylinder 47 is fixed to the scale line material melt extrusion screw cylinder 44 through its lower feed cylinder discharge pipe 471 at the position corresponding to the extrusion screw cylinder inlet 442 provided at the upper end of the scale line material melt extrusion screw cylinder 44.

[0036] Under the control of the electrical controller of the blow molding machine, the extrusion motor 41 works, driving the extrusion gearbox 42. The final stage power output shaft of the extrusion gearbox drives the screw seat 451 via the screw seat rotation connecting nut 4511. The screw seat 451 drives the scale line material melting extrusion screw 45. The scale line material melting extrusion screw 45 extrudes the scale line material supplied by the feed cylinder 47, which enters the scale line material melting extrusion screw cylinder 44 sequentially through the feed cylinder outlet pipe 471 and the extrusion screw cylinder inlet 442. The extruded molten scale line material sequentially passes through the screw cylinder fixing seat through hole 4411, the scale line molten material outlet hole 4613, the scale line material outlet 4612, the scale line material groove 22624, and the scale line material inlet hole 22625 until it enters the main plastic melt feed channel 2263. Thus, under the rhythmic control of the extrusion motor 41 by the electrical controller, the graduated lines are formed on the outer wall of the main plastic melt flowing through the main plastic melt feed channel 2263. Since the structure and working mechanism of the first graduated line extrusion mechanism 3 and the second graduated line extrusion mechanism 4 are the same, except that the first graduated line extrusion mechanism 3 serves the first die head mechanism 21, which has the same structure as the second die head mechanism 22, although the applicant has not described it again, it will not cause confusion in understanding the invention based on the principle of analogy.

[0037] The main plastic (not shown) is extruded by a main plastic screw extruder to the aforementioned main plastic melt conveying connector 2233, and then sequentially flows through the main plastic melt cavity 2231 of the die holder, the main plastic melt outlet channel 2232 of the lower feed die holder, the feed channel 2241 of the diverter column, the main plastic melt guide cavity 2242, the main plastic melt guide channel 2251, the main plastic melt feed channel 2263, the melt channel 22612 of the support ring guide sleeve, and the melt outlet channel 2292 of the die, until it flows out from the bottom of the die 229, that is, from the bottom of the melt outlet channel 2292 of the die, to form a molten billet. The molten billet enters the mold of the blow molding machine's structural system, and is cut by the molten billet cutting mechanism and blow-formed by the blow molding mechanism.

[0038] Since the wall thickness of hollow plastic containers of different sizes varies, the specific thickness is determined by the hollow plastic container manufacturer using this invention according to customer requirements. The adaptive adjustment to varying wall thicknesses, or the adjustment of the thickness of the molten billet exiting the die melt outlet channel 2292, has already been explained above. For example, the die holder 228 is moved upwards or downwards by the pull rod 12113. The die holder 228 drives the die sleeve 2291 through the die sleeve support ring 2282, and the upward or downward displacement of the die sleeve 2291 changes the width of the die melt outlet channel 2292. The higher the die sleeve is moved, the wider the die melt outlet channel 2292 is, and the greater the wall thickness of the hollow plastic container is, and vice versa. Therefore, this will not be elaborated further.

[0039] Because the wall thickness control mechanism 1 of this invention includes first and second wall thickness control devices 11 and 12, and the die head body 2 of this invention includes first and second die head mechanisms 21 and 22, as well as extrusion mechanisms 3 and 4 with first and second scale lines, it is possible to simultaneously produce hollow plastic containers with different wall thicknesses using two sets of equipment, or simultaneously produce hollow plastic containers with the same wall thickness using two sets of equipment. The former has good adaptability to different product wall thicknesses, meaning it is not picky and can improve the production efficiency of hollow plastic products, while the latter allows two sets of equipment to produce hollow plastic products with the same wall thickness in parallel. Therefore, the adaptability of the structure of this invention to the production of hollow plastic products is extremely high.

[0040] Furthermore, according to professional knowledge, the color of the molten material used for the graduation lines is different from the color of the main molten plastic. For example, the former (the molten material used for the graduation lines) is black, yellow, or red, while the latter (the molten plastic used for the main molten plastic) is white. In short, the significant color contrast between the two makes the graduation lines prominent and visible.

[0041] In summary, the technical solution provided by this invention makes up for the shortcomings of the prior art, successfully completes the invention task, and accurately realizes the technical effects described by the applicant in the above technical effects column.

Claims

1. A hollow blow molding die head structure with independently controllable wall thickness, comprising a wall thickness control mechanism (1) and a die head body (2), wherein the wall thickness control mechanism (1) is located above the die head body (2) and connected to the die head body (2), characterized in that: The wall thickness control mechanism (1) includes a first wall thickness control device (11) and a second wall thickness control device (12). The die head body (2) includes a first die head mechanism (21) and a second die head mechanism (22). The first die head mechanism (21) and the second die head mechanism (22) are arranged parallel to each other. The first wall thickness control device (11) and the second wall thickness control device (12) are arranged parallel to each other on the blow molding machine frame fixing connection plate (10) and extend downward to the bottom of the blow molding machine frame fixing connection plate (10) to be connected to the first die head mechanism (21) and the second die head mechanism (22) respectively. When the widths of the melt flow channels of the first mold head mechanism (21) and the second mold head mechanism (22) adjusted by the first wall thickness control device (11) and the second wall thickness control device (12) are different, the wall thicknesses of the hollow plastic containers blown by the blow molding mechanism of the blow molding machine from the melt of the first and second mold head mechanisms (21, 22) are different. When the widths of the melt flow channels of the first and second mold head mechanisms (21, 22) adjusted by the first and second wall thickness control devices (11, 12) are the same, the wall thicknesses of the hollow plastic containers blown by the blow molding mechanism of the blow molding machine from the melt of the first and second mold head mechanisms (21, 22) are the same.

2. The hollow blow molding die head structure with independently controllable wall thickness according to claim 1, characterized in that: The structure of the first wall thickness control device (11) is the same as that of the second wall thickness control device (12); the structure of the first mold head mechanism (21) is the same as that of the second mold head mechanism (22).

3. The hollow blow molding die head structure with independently controllable wall thickness according to claim 2, characterized in that: The second wall thickness control device (12) includes a mold sleeve adjusting seat drive cylinder (121), a mold sleeve adjusting seat drive cylinder column baffle (122), a wall thickness control plate (123), an electronic ruler (124), an upper limit nut (125), a lower limit nut (126), and a limit nut lifting and lowering guide rod (127). The mold sleeve adjusting seat drive cylinder (121) is fixed on the upward side of the blow molding machine frame fixed connecting plate (10). The lower end of the mold sleeve adjusting seat drive cylinder column (1211) of the mold sleeve adjusting seat drive cylinder (121) passes downward through the cylinder column clearance hole (101) opened on the blow molding machine frame fixed connecting plate (10), and is fixed by the lower end of the cylinder column fixed connecting seat (12111) through the lower end of the cylinder column fixed connecting seat screw. The nail (12115) is fixed to the tie rod fixing seat (12112), and the tie rod fixing seat (12112) is connected to the second mold head mechanism (22) through a set of tie rods (12113) distributed in a grid pattern. The upper end of the mold sleeve adjusting seat drive cylinder column (1211) extends above the mold sleeve adjusting seat drive cylinder (121). The middle part of the mold sleeve adjusting seat drive cylinder column baffle (122) in the length direction is fixed to the upper end face of the mold sleeve adjusting seat drive cylinder column (1211) through the baffle fixing screw (1221). A limit guide rod clearance hole (1222) is opened at the left end of the mold sleeve adjusting seat drive cylinder column baffle (1222). The wall thickness control plate (123) is fixed to the wall thickness control plate levitation column screw (12311). The upper end of a set of wall thickness control plate levitation columns (1231) is fixed to the top of the cylinder body of the mold sleeve adjustment seat drive cylinder (121). The upper end of the mold sleeve adjustment seat drive cylinder column (1211) passes upward through the wall thickness control plate cylinder column clearance hole (1232) opened on the wall thickness control plate (123). The lower end of the electronic ruler (124) is fixed on the electronic ruler fixing plate (1241) in a state of contact with the side of the mold sleeve adjustment seat drive cylinder column baffle (122) facing upward. The lower end of the electronic ruler fixing plate (1241) is fixed to the wall thickness control plate (123). The upper limit nut (125) and the lower limit nut (126) are respectively corresponding to the wall thickness control plate (123). The lower and upper positions of the mold sleeve adjusting seat drive cylinder column (12114) are threadedly fixed to the upper end of the drive cylinder column threaded section (12114) of the mold sleeve adjusting seat drive cylinder column (1211). The lower end of the limit nut lifting limit guide rod (127) cooperates with the upper limit nut positioning groove (1251) formed on the periphery of the upper limit nut (125) and the lower limit nut positioning groove (1261) formed on the periphery of the lower limit nut (126). The upper end extends through the limit guide rod relief hole (1222) to the upper part of the mold sleeve adjusting seat drive cylinder column baffle (122). The middle part is locked with the wall thickness control plate (123) by the lifting limit guide rod screw (1271). The mold sleeve adjusting seat drive cylinder (121) is a hydraulic cylinder.

4. The hollow blow molding die head structure with independently controllable wall thickness according to claim 3, characterized in that: A first scale line material extrusion mechanism (3) for forming scale lines on the wall of a blown hollow plastic container is connected to the first die head mechanism (21), and a second scale line material extrusion mechanism (4) for forming scale lines on the wall of a blown hollow plastic container is connected to the second die head mechanism (22), and the first and second scale line material extrusion mechanisms (3, 4) have the same structure.

5. The hollow blow molding die head structure with independently controllable wall thickness according to claim 4, characterized in that: The second die head mechanism (22) includes a feed die holder fixing plate (221), an upper feed die holder (222), a lower feed die holder (223), a flow divider column (224), a flow divider plate (225), a flow divider plate seat (226), a die head inner core guide (227), a die holder (228), and a die (229). The feed die holder fixing plate (221) is fixed to the upper feed die holder (222) at a position corresponding to the lower position of the tie rod fixing seat (12112) and the upper feed die holder (222) by feed die holder fixing plate screws (2211). A guide column (2212) is fixed longitudinally at each of the four corners of the feed die holder fixing plate (221) facing upward. The upper end of the upper feed mold base (222) is fixed to the fixed connecting plate (10) of the blow molding machine frame. The middle part of the tie rod fixing seat (12112) and the guide column (2212) form a sliding pair. The upper feed mold base (222) is located above the lower feed mold base (223) and is fixed to the lower feed mold base (223) by the upper feed mold base fixing screw (2221). The middle part of the upper and lower feed mold bases (222, 223) on opposite sides together form a mold base main plastic melt cavity (2231). The lower feed mold base (223) is also provided with a lower feed mold base main plastic melt outlet channel (2232) in a longitudinal state. The upper part of the lower feed mold base main plastic melt outlet channel (2232) is connected to the mold base main plastic melt cavity (2212). 231) is connected to the lower end of the feed channel (2241) on the diverter column (224), and is aligned and connected to it. A main plastic melt conveying connector (2233) is fixed on the right side, which corresponds to both the upper feed die (222) and the lower feed die (223). The main plastic melt conveying connector (2233) is connected to the main plastic melt cavity (2231) of the die. In use, the main plastic melt conveying connector (2233) is connected to the screw extruder. The diverter column (224) is located between the lower feed die (223) and the diverter plate (225). A main plastic melt guiding cavity (2242) is opened on the diverter column (224). The upper part of (2242) communicates with the feed channel (2241) of the diversion column. The diversion plate (225) is disposed between the lower surface of the diversion column (224) and the diversion plate seat (226). The diversion plate seat (226) is disposed between the diversion plate (225) and the opposite side of the diversion plate seat support ring (2261). A die head inner core cavity is formed in the center of the diversion plate seat (226). A die head inner core (2262) is disposed in the die head inner core cavity. The lower end of the die head inner core (2262) extends to the bottom of the diversion plate seat (226) and the diversion plate seat support ring (2261) and is connected to the upper end of the die (229). The die head inner core guide 227 and the diversion plate 225 form an integral structure.The upper end of the die core guide 227 extends above the distribution plate 225 and penetrates into the main plastic melt guiding cavity 2242. The outer wall of the middle part of the die core guide 227 forms a grid-like integral connection with the center of the distribution plate 25. The space between the outer wall of the die core guide 227 and the inner wall of the distribution plate 225 constitutes a main plastic melt guiding channel (2251) that communicates with the main plastic melt guiding cavity (2242). The lower end of the die core guide (227) extends into the main plastic melt guiding channel (2251). The lower part of the die core (2251) mates with the upper central part of the die core (2262) and is fixed by the die core reinforcing connecting screw (2271). The space between the upper outer wall of the die core (2262) and the wall of the die core clearance hole at the center of the distribution plate seat (226) forms the main plastic melt feeding channel (2263). A support ring guide sleeve (22611) is provided on the distribution plate seat support ring (2261). The lower end of the die core (2262) extends to the support ring guide sleeve (22611). 11) Inside, and the space between the outer wall of the inner core of the die head (2262) and the inner wall of the support ring guide sleeve (22611) forms the melt flow channel (22612) of the support ring guide sleeve. The main plastic melt feed channel (2263) is connected to the main plastic melt guide channel (2251). The die holder (228) is located below the support ring (2261) of the flow divider plate seat. The die (229) is located in the die holder cavity of the die holder (228), and the upper end of the die (229) is connected to the lower end of the inner core of the die head (2262). The lower ends of the set of grid-shaped tie rods (12113) are connected to the die holder (228) via threaded connection. The space between the outer wall of the die (229) and the cavity wall of the die sleeve cavity (2291) forms the die melt outlet channel (2292), which communicates with the melt outlet channel (2292) of the support ring guide sleeve (22612). The second scale line extrusion mechanism (4) is fitted with the flow distribution plate seat (226) and communicates with the main plastic melt feed channel (2263).

6. The hollow blow molding die head structure with independently controllable wall thickness according to claim 5, characterized in that: A melt flow rate control column adjusting screw seat (2234) is fixed on the lower feed die holder (223) and located on the left side. A melt flow rate control column adjusting screw (2234) is screwed onto the melt flow rate control column adjusting screw seat (2234). A melt flow rate control column (22342) is fixed to the right end of the melt flow rate control column adjusting screw (22341). The melt flow rate control column (22342) is connected to the lower feed die holder (22344). The melt flow rate control pin hole (2235) on the 223) is slidably fitted and communicates with the main plastic melt outlet channel (2232) of the lower feed mold base. The degree to which the melt flow rate control pin (22342) enters or exits the main plastic melt outlet channel (2232) of the lower feed mold base can be changed by rotating the melt flow rate control pin adjusting screw (22341) clockwise or counterclockwise, and the melt channel of the main plastic melt outlet channel (2232) of the lower feed mold base becomes smaller or larger.

7. The hollow blow molding die head structure with independently controllable wall thickness according to claim 5, characterized in that: A compressed air inlet hole (2272) is formed at the lower center of the inner core guide (227) of the die head. A central vent hole (22711) is formed at the longitudinal center of the reinforcing connecting screw (2271) of the die head, corresponding to and communicating with the compressed air inlet hole (2272). The central vent hole (22711) communicates with the vent cavity (22621) of the inner core of the die head, which is located at the lower center of the inner core of the die head (2262). The vent cavity (22621) communicates with the die head opening (229) which is opened longitudinally. The die is connected to the central hole (2293) at the center of the die; an air blowing pipe (2252) is attached to the side of the distribution plate (225). The end of the air blowing pipe (2252) facing the distribution plate (225) is connected to the compressed air inlet hole (2272) of the die inner core guide through the distribution plate air passage (2253) opened on the distribution plate (225), while the end of the air blowing pipe (2252) away from the distribution plate (225) is connected to the compressed air supply device pipeline in use; the upper end of the die inner core guide (227) is bullet-shaped; the compressed air supply device is an air compressor.

8. The hollow blow molding die head structure with independently controllable wall thickness according to claim 5, characterized in that: A scale guide ring (22622) is fitted in the middle of the inner core (2262) of the die head in the height direction by a scale guide ring fixing screw (22623). A scale material groove (22624) is formed on the outer wall of the scale guide ring (22622) and recessed into the surface of the scale guide ring (22622). A scale material inlet is formed in the scale material groove (22624) and at one end of the scale material groove (22624). Hole (22625), the scale line material inlet hole (22625) is connected to the main plastic melt feed channel (2263); the second scale line material extrusion mechanism (4) is engaged with the flow distribution plate seat (226) at the position corresponding to the scale line guide ring (22622) and is connected to the scale line material groove (22624); the middle part of the second scale line material extrusion mechanism (4) is fixed to the left side of the blow molding machine frame fixed connection plate (10).

9. The hollow blow molding die head structure with independently controllable wall thickness according to claim 5, characterized in that: A sliding sleeve (2281) is fixed at the center of the die holder (228) by a sliding sleeve fixing screw (22811). The lower end of the support ring guide sleeve (22611) extends into the sliding sleeve cavity of the sliding sleeve (2281) and forms a sliding pair with the sliding sleeve cavity wall of the sliding sleeve (2281). A die holder support ring (2282) is fixed at the bottom of the die holder (228) by a die holder support ring fixing screw (22821). A die holder support flange edge (22911) is provided on the upper part of the die holder (2291) and extends outward around the die holder (2291). The die holder support flange edge (22911) is supported on the die holder support ring (2282).

10. The hollow blow molding die head structure with independently controllable wall thickness according to claim 8, characterized in that: On the left side of the distribution plate seat (226) and at a position corresponding to the scale line guide ring (22622), a scale line material discharge sleeve mating cavity (2264) is formed. A scale line material inlet (22641) is formed in the center of this scale line material discharge sleeve mating cavity (2264), and this scale line material inlet (22641) communicates with the scale line material inlet hole (22625). The second scale line material extrusion mechanism (4) includes an extrusion motor (41), an extrusion gearbox (42), a fixed mounting base (43), a scale line material melt extrusion screw barrel (44), a scale line material melt extrusion screw (45), a scale line material discharge cylinder seat (46), and a feeding cylinder (47). The extrusion motor (41) is located in... The position above the extrusion gearbox (42) is engaged with the extrusion gearbox (42) for transmission. The extrusion gearbox (42) is fixed to the upper part of the fixed mounting base (43). The final stage power output shaft of the extrusion gearbox (42) extends downward into the upper cavity (431) of the fixed mounting base (43). The lower part of the fixed mounting base (43) forms the lower cavity (432). The fixed mounting base (43) is fixed to the fixed mounting base bracket (48), and the fixed mounting base bracket (48) is fixed to the left side of the blow molding machine frame fixed connecting plate (10) by the fixed mounting base bracket screw (481). The upper end of the scale line material melt extrusion screw barrel (44) is fixed to the lower part of the fixed mounting base (43). The lower end of the graduated wire material melt extrusion screw barrel (44) is fixed to the upper part of the graduated wire material discharge barrel seat (46) via a screw barrel fixing seat (441). The graduated wire material melt extrusion screw (45) is set inside the graduated wire material melt extrusion screw barrel (44). The upper end of the graduated wire material melt extrusion screw (45) is fixed to a screw seat (451) set in a fixed mounting seat (43). The upper end of the screw seat (451) is located in the upper cavity (431) of the fixed mounting seat and is connected to the final stage power output shaft of the extrusion gearbox via a screw seat rotation connecting nut (4511). The screw seat (451) is located on the screw seat and in the upper cavity (431) and lower cavity (431) of the fixed mounting seat, respectively. 2) Each position is provided with a screw seat rotation support bearing (4512). A scale material discharge cylinder (461) extends from the right side of the scale material discharge cylinder seat (46). The right end of the scale material discharge cylinder (461) is fixed to the diverter plate seat (226) by a set of discharge cylinder fixing screws (4611) at the position corresponding to the scale material discharge sleeve mating cavity (2264). The scale material discharge port (4612) of the scale material discharge cylinder (461) is mated with and communicates with the scale material inlet (22641). A screw cylinder fixing seat passage hole (4411) is opened on the screw cylinder fixing seat (441) at the position corresponding to the lower end of the scale material melt extrusion screw (45).On the graduated material discharge cylinder seat (46), a graduated material discharge cylinder seat through hole (462) is provided at a position corresponding to the screw cylinder fixing seat through hole (4411), communicating with the screw cylinder fixing seat through hole (4411). A graduated material molten material outlet hole (4613) is provided on the graduated material discharge cylinder (461), with its left end communicating with the graduated material discharge cylinder seat through hole (462) and its right end communicating with the graduated material discharge port (4612). The feed cylinder (47) is fixed to the graduated material molten extrusion screw cylinder (44) at a position corresponding to the extrusion screw cylinder inlet (442) at the upper end of the graduated material molten extrusion screw cylinder (44) via its lower feed cylinder outlet pipe (471).

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