A dual-station blow molding production equipment

Abstract

This invention relates to a dual-station blow molding production equipment, including a frame, an extrusion mechanism fixed on the frame, the extrusion mechanism including a spiral conveyor and a die head vertically fixed on the frame, the die head being connected to the spiral conveyor; a mold closing mechanism located below the die head, comprising two sets, including a turntable and four mold mounting plates that reciprocate radially along the turntable, the mounting plates fixing blow molding dies, the four blow molding dies forming a closed cavity after being closed; a shearing mechanism located on the frame, including a cutter located at the die head capable of relative movement to shear the hollow cylindrical mold blank; and an air blowing mechanism located on the frame, with one set on each side of the die head; the contact arc between each independent blow molding die and the corrugated surface of the car dust cover is significantly reduced, thereby greatly reducing local bonding stress during mold opening, effectively avoiding the problems of product stretching, tearing, or even structural damage caused by excessive overall covering force during demolding of traditional two-part molds.

Description

Technical Field

[0001] This invention belongs to the technical field of blow molding equipment, and particularly relates to a dual-station blow molding production equipment. Background Technology

[0002] A blow molding machine is a key piece of equipment used to mold hollow plastic products. Its typical process is as follows: Semi-crystalline plastic granules such as PE and PP are first heated to a molten state, and then extruded through an extrusion mechanism to form a hollow tubular thermoplastic preform. Once the preform reaches the predetermined length, a mold opening and closing device opens the mold, and the hot preform is placed into the split mold. After the mold closes, compressed air is immediately introduced into the preform, causing it to expand and tightly adhere to the inner wall of the mold. After cooling and solidification, it is demolded, ultimately yielding the hollow plastic product.

[0003] To improve production efficiency, modern blow molding equipment often adopts a dual-station structure. A dual-station blow molding machine has two independent mold-closing mechanisms (usually labeled station A and station B). The two stations generally share a single extrusion system and die head, achieving continuous production through alternating operations. While one station performs processes such as mold closing, blow molding, and cooling, the other station can simultaneously perform mold opening, product removal, and material preparation, thereby significantly reducing waiting time and improving equipment utilization and overall output.

[0004] As a typical hollow blow-molded product, the car dust cover has a corrugated tubular structure with multiple uniform peaks and troughs distributed on its surface. This kind of continuous undulating geometry is difficult to form in one step through injection molding, while blow molding uses air pressure to make the preform adhere to the mold cavity, which can effectively reproduce complex curved surfaces and internal hollow structures, thus becoming the preferred molding method for producing car dust covers.

[0005] After blow molding, existing car dust covers require cooling and demolding processes. The commonly used mold structure consists of two opposing half-molds: during blow molding, the two half-molds close to form a cavity, and compressed air is introduced into the cavity to cause the plastic preform to expand and adhere tightly to the inner wall of the mold; after the dust cover cools and solidifies, the two half-molds separate to demold the product.

[0006] However, due to the corrugated structure of the automotive dust cover, its surface has a continuous uneven surface, resulting in significant adhesion resistance between the inner wall of the mold and the surface of the product during the mold opening process. When the two separate, the inner wall of the mold easily creates significant adsorption and friction on the dust cover, making demolding difficult. When separating the half-mold, the dust cover is prone to localized stretching, tearing, or even structural damage at the crests or troughs, seriously affecting the product molding quality and production qualification rate. Summary of the Invention

[0007] Therefore, the purpose of this invention is to provide a dual-station blow molding production equipment to solve the technical problem in the prior art where there is a large adhesion resistance between the inner wall of the mold and the car dust cover, and the demolding is difficult when the two half molds separate relative to each other.

[0008] To achieve the above objectives, the technical solution adopted by the present invention for a dual-station blow molding production equipment is as follows:

[0009] A dual-station blow molding production line includes:

[0010] The frame is fixed to the ground;

[0011] The extrusion mechanism is fixed on the frame. The extrusion mechanism includes a spiral conveyor cylinder fixed horizontally on the top of the frame and a die head fixed vertically on the frame. The die head is connected to the spiral conveyor cylinder. The plastic raw material is squeezed inside the spiral conveyor cylinder and then extruded from the die head into a hollow cylindrical die blank.

[0012] The slide rail extends and is fixed to the front side of the frame in the left-right direction;

[0013] The mold closing mechanism is located below the mold head. There are two sets of mold closing mechanisms. The bottom of the mold closing mechanism slides and engages with the guide rail. The two sets of mold closing mechanisms move alternately to the bottom of the mold head to alternately receive the hollow cylindrical mold blank. The mold closing mechanism includes a turntable and four mold mounting plates that reciprocate radially along the turntable. Blow molding molds are fixed on the mounting plates. After the four blow molding molds are closed, they form a closed cavity to enclose the hollow cylindrical mold blank in the closed cavity.

[0014] A shearing mechanism is mounted on the frame. The shearing mechanism includes a cutter mounted at the die head that can move relative to the die head to cut the hollow cylindrical die blank.

[0015] The air blowing mechanism is guided and slidably mounted on the frame. One set of air blowing mechanism is set on each of the left and right sides of the mold head. The mold closing mechanism can move back and forth between the mold head and the air blowing mechanism. After the mold closing mechanism wraps the mold blank, it moves to the air blowing mechanism, which blows air to shape the mold blank.

[0016] Beneficial Effects: This invention provides a dual-station blow molding equipment for the production of automotive dust covers. Its mold-closing mechanism employs a radially parting design with four blow molding molds, effectively solving the problems of difficult demolding and easy breakage of corrugated dust covers in traditional split molds. Specifically, the mold-closing mechanism includes four mold mounting plates that reciprocate radially along a turntable, each mounting plate holding a blow molding mold. The four blow molding molds are precisely aligned during mold closing, collectively forming a complete automotive dust cover cavity. During the blow molding process, a preheated tubular preform is first placed between the four blow molding molds, then the four molds close to form the cavity. Compressed air is then introduced into the preform, causing it to expand and completely adhere to the inner wall surface of the mold. After cooling and solidification, the four blow molding molds move synchronously outwards radially along the turntable, separating from the formed dust cover. The core advantage of the four-part blow molding design lies in the significantly reduced contact radius between each independent blow molding mold and the corrugated surface of the automotive dust cover, thereby greatly reducing local bonding stress during mold opening. This design effectively avoids the problems of product stretching, tearing, or even structural damage caused by excessive overall covering force during demolding of traditional two-part molds, significantly improving the dimensional stability, surface quality, and overall production qualification rate of the automotive dust cover.

[0017] Furthermore, the mold clamping mechanism includes a first support plate, a second support plate, and a third support plate arranged sequentially from bottom to top. A drive motor is fixedly installed between the first support plate and the second support plate. The turntable is fixed on the output shaft of the drive motor and is located above the third support plate. The turntable has four vertically penetrating arc-shaped grooves, which are evenly distributed along the circumference of the turntable. Four guide sliding mechanisms are evenly distributed along the circumference on the radial outer side of the turntable, extending radially along the turntable. The guide sliding mechanisms are installed on the third support plate and include guide posts installed in the arc-shaped grooves and adapted to guide the sliding of the arc-shaped grooves. The mold mounting plate is fixed on the guide sliding mechanism.

[0018] Beneficial Effects: In the dual-station blow molding equipment of this invention, the movement of the mold closing mechanism is achieved through a coordinated drive and guide system. Specifically, the drive motor serves as the power source, driving the turntable to rotate. During the rotation of the turntable, through precise cooperation with the guide sliding mechanism, the rotational motion is converted into synchronous linear motion of the four mold mounting plates along the radial direction of the turntable. This motion mechanism ensures that the blow molding dies on the four mounting plates can accurately and synchronously move towards the center of the turntable, thereby completely closing and forming a complete automotive dust cover molding cavity. Similarly, during the demolding stage, the system can also control the four sets of molds to move synchronously and smoothly outward along the radial direction, achieving smooth separation from the cooled and solidified dust cover. This integrated drive and guide design not only ensures the high synchronicity and positional accuracy of the mold movement during mold closing and opening, but also effectively avoids product deformation or damage that may be caused by asynchronous mold movements, further improving the stability of the demolding process and the product molding quality.

[0019] Furthermore, the guiding sliding mechanism includes a guide rail fixed on the third support plate, a slider slidably disposed on the guide rail, and a guide plate fixed on the slider. The guide rail extends radially along the turntable, and the guide plate is L-shaped. The guide plate includes a first fixed plate fixedly connected to the slider and a second fixed plate fixed perpendicularly to the first fixed plate. The mold mounting plate is fixedly connected to the second fixed plate, and the guide post is fixed on the first fixed plate.

[0020] Beneficial Effects: In the dual-station blow molding equipment of this invention, the guide plate adopts an L-shaped structure design. This design has dual advantages in terms of mechanical connection and motion guidance, specifically as follows: First, the L-shaped guide plate consists of a first fixed plate and a second fixed plate that are perpendicular to each other. The first fixed plate and the slider are rigidly connected by fasteners, which not only simplifies installation but also significantly enhances the shear and torsional stiffness of the connection structure due to its large-area contact characteristics, thereby ensuring that the force flow transmitted by the slider during movement is evenly distributed and avoiding local stress concentration. Second, the second fixed plate and the mold mounting plate are stably connected in the same way. The core advantage of the L-shaped structure here is that it greatly increases the effective connection area between the guide plate and the mold mounting plate. This design significantly improves the overall rigidity formed by the two during mold closing and opening, effectively suppressing the vibration, sway, or slight deformation that may occur when the mold mounting plate moves at high speed or under heavy load, thereby ensuring that it moves smoothly and accurately along the preset guide trajectory. In summary, the L-shaped guide plate, through its unique geometric structure, simultaneously optimizes the interface connection and enhances the structural rigidity on both the slider side and the mold mounting plate side. This comprehensively improves the dynamic stability and positional repeatability of the mold clamping mechanism during reciprocating motion, providing a reliable mechanical foundation for high-quality and efficient demolding of corrugated automotive dust covers.

[0021] Furthermore, the mold clamping mechanism includes a fourth support plate spaced above the third support plate. A mounting bracket is fixed to the lower surface of the fourth support plate. A first gear is fixed to the output shaft of the drive motor, and the first gear is positioned between the second and third support plates. Four rotating shafts are rotatably arranged between the second and fourth support plates. The third support plate has clearance holes for the rotating shafts to pass through. A second gear is fixed to the lower end of each rotating shaft. Four second gears are arranged circumferentially around the first gear. The second gears mesh with the first gears for transmission. A guide member is fixed above the mold mounting plate. The guide member is slidably arranged relative to the mounting bracket. The rotating shafts and the guide member are connected by a transmission mechanism so that the movement of the guide member can achieve the pushing of the mold mounting plate.

[0022] Beneficial Effects: This invention further optimizes the guiding system of the mold mounting plate. By adding an upper guide component and its corresponding transmission mechanism, it achieves synchronous linkage with the existing turntable and guide sliding mechanism, significantly improving the overall stability and trajectory accuracy of the mold mounting plate during high-speed reciprocating motion. Specifically, a guide component is fixedly installed above the mold mounting plate, and this guide component can slide relative to the mounting frame. This design allows the guide component to continuously apply constraint and support to the upper part of the mold mounting plate, so that when the mold mounting plate moves radially back and forth along the turntable, it is constrained not only in the horizontal direction but also effectively pushed and limited in the vertical direction. This two-way constraint mechanism works together to effectively suppress possible vertical displacement and vibration during movement. To achieve precise coordination of motion, this invention designs a dedicated synchronous transmission mechanism. This mechanism, through the cooperation of a first gear, a second gear, a rotating shaft, and corresponding transmission components, accurately transmits the horizontal reciprocating motion of the guide plate to the upper guide component. Thus, the guide component and the guide plate form a completely synchronous linkage relationship. During mold closing and opening, the two components work together to apply uniform and synchronous constraint forces to the mold mounting plate, thereby significantly offsetting vibrations, swaying, or slight deformations that may be induced by high-speed operation or changes in load, ensuring that the mold mounting plate always moves smoothly and accurately along the preset radial trajectory. In summary, this invention, through a design that combines top pushing and lateral guidance with mechanical transmission to achieve bidirectional synchronization, constructs a multi-dimensional rigid guiding system, fundamentally enhancing the motion stability of the mold closing mechanism under dynamic working conditions, and providing a key guarantee for high-quality, high-cycle blow molding.

[0023] Furthermore, a first drive shaft is rotatably mounted on the lower end of the fourth support plate, and a first bevel gear set is provided on the upper end of the shaft and one end of the first drive shaft to realize the transmission connection between the shaft and the first drive shaft; a second drive shaft is rotatably mounted on the mounting bracket, and a second bevel gear set is provided on one end of the second drive shaft and one end of the first drive shaft to realize the transmission connection between the first drive shaft and the second drive shaft; a third gear is fixed on the second drive shaft, and the guide is a rack that slides relative to the mounting bracket, and the rack meshes with the third gear for transmission; a through hole is provided on the fourth support plate to avoid the mold mounting plate.

[0024] Beneficial effects: Power is transmitted from the drive motor to the rotating shaft, output from the shaft, and then transmitted to the first transmission shaft via the first bevel gear set; the second bevel gear set then transmits the power from the first rotating shaft to the second transmission shaft; subsequently, the third gear on the second transmission shaft meshes with the rack structure sliding along the guide on the mounting bracket, converting the rotational motion into linear motion; finally, the power is transmitted to the upper part of the mold mounting plate via the rack, achieving stable pressure on the mold mounting plate. This transmission system, through a multi-stage linkage design, smoothly transmits the power of the drive motor to the upper end of the mold mounting plate, thereby forming effective pressure on it during movement and ensuring smoother operation of the mold mounting plate.

[0025] The blow molding mold includes a mold base plate fixedly connected to a mold mounting plate and an inner template fixedly connected to the mold base plate. Both the mold mounting plate and the mold base plate are arc-shaped plates. The outer circumferential surface of the inner template is an arc shape adapted to the mold base plate. When the four mold mounting plates move toward the center of the turntable and are assembled into a cylinder, the inner surface of the inner template forms a cavity adapted to the outer surface of the car dust cover. An installation hole is provided above the inner template, and an air blowing component is fixed in the installation hole to blow air between the car dust cover and the inner template after the car dust cover has cooled and solidified.

[0026] Beneficial Effects: In this invention, by rationally opening mounting holes on the surface of the inner template of the blow molding die and securely installing an air blowing component within these holes, the air blowing component can output controllable airflow into the gap between the dust cover and the inner template after the dust cover has cooled and solidified. The blowing action of the air blowing component effectively reduces the adhesion stress between the two, significantly accelerating the separation speed of the dust cover from the inner template. Furthermore, the air blowing component, with its separate structure from the blow molding die, works in synergy to further ensure that the molded dust cover can smoothly and stably detach from the inner template, avoiding product deformation or damage caused by excessive demolding resistance.

[0027] Furthermore, the air blowing assembly includes a tube fixed in the mounting hole, a driving cavity and a buffer cavity communicating with the driving cavity are provided in the tube, a guide cavity is provided at the end of the driving cavity away from the buffer cavity, an air inlet short pipe is fixed to the tube, one end of the air inlet short pipe is used to be fixedly connected to the air cooler, and the other end of the air inlet short pipe extends into the guide cavity; a connecting port is provided in the tube, which realizes the communication between the buffer cavity and the inner template cavity; a driving assembly is provided in the driving cavity.

[0028] Beneficial Effects: The air blowing assembly employs a systematic structural design including an inlet duct, a drive assembly, and a connecting port. The inlet duct guides the stable input of airflow generated by the air cooler; the drive assembly controls the opening and closing of the connecting port. By operating this assembly, the connecting port can be precisely blocked or opened, effectively regulating the airflow path and ensuring that airflow enters the inner mold cavity as needed. Finally, the airflow is accurately guided into the inner mold cavity through the connecting port. Under this coherent mechanism, the airflow effectively acts between the automotive dust cover and the inner surface of the inner mold, thus reliably and quickly blowing the dust cover away, significantly shortening the demolding time and reducing the risk of product damage during demolding.

[0029] Furthermore, the drive assembly includes a vent pipe that is slidably disposed in the guide cavity, drive cavity, and buffer cavity. One end of the vent pipe in the guide cavity is slidably sealed with the air inlet short pipe. A conical platform is fixed on the vent pipe and disposed in the drive cavity. The drive assembly also includes a telescopic drive structure. The telescopic direction of the telescopic drive structure is perpendicular to the extension direction of the vent pipe. The telescopic end of the telescopic drive structure is an inclined surface adapted to the inclination of the conical platform. A spring is also disposed in the drive cavity. The spring is sleeved on the vent pipe and is located between the conical platform and the side wall of the drive cavity. A blocking block is disposed at one end of the vent pipe facing the communication port. The blocking block includes a blocking section adapted to the communication port and a guide section adapted to the guide sliding of the buffer cavity. The guide section and the blocking section are fixedly connected. A first air outlet with internal and external communication is opened on the pipe section of the vent pipe located in the buffer cavity. A first communication hole is opened on the guide section. A second air outlet communicating with the vent pipe is opened on the blocking section.

[0030] Beneficial effects: The drive assembly, through the adaptation of the inclined surface of the telescopic end in the telescopic drive structure to the conical platform, and the spring arrangement between the conical platform and the side wall of the drive cavity, can control the sealing block's blocking or opening of the connecting port. Furthermore, airflow can enter the buffer chamber through the first outlet of the vent pipe, then pass through the buffer chamber through the first connecting hole into the connecting port, and be guided into the inner template cavity through the connecting port. When the sealing section leaves the connecting port, airflow can also be directly delivered to the connecting port through the second outlet of the vent pipe, and then guided into the inner template cavity through the connecting port. The first and second outlets work together to simultaneously supply air to the connecting port after it opens, ensuring sufficient airflow between the car dust cover and the inner template.

[0031] The shearing mechanism includes an upper fixed plate and a lower fixed plate fixed to the frame. A front panel is fixed to the front end of the upper fixed plate and the lower fixed plate. A large guide frame and a small guide frame are slidably arranged on the front panel. The small guide frame is set in the large guide frame. The large guide frame includes a first plate located on the front side of the front panel and a second plate located on the rear side of the front panel. The small guide frame includes a third plate located on the front side of the front panel and a fourth plate located on the rear side of the front panel. The first plate and the third plate are arranged opposite each other. Cutting blades are fixed on the opposite sides of the first plate and the third plate respectively. The shearing mechanism also includes a second driving member that drives the large guide frame and the small guide frame to move relative to each other and a transmission structure that is connected to the second driving member.

[0032] Beneficial effects: The shearing mechanism adopts a symmetrical layout design, enabling the cutters on the first and third plates to move synchronously in opposite directions. Under the control of the drive unit, the two cutters precisely align directly below the die head, jointly completing the shearing action on the hollow cylindrical die blank. This coordinated motion mechanism not only ensures a rapid and clean shearing process but also effectively avoids material deformation or uneven cuts, thereby guaranteeing the accuracy of die blank shearing and the quality of the finished product.

[0033] Furthermore, the second driving member is fixed on the lower fixed plate, and the transmission structure includes a driving gear fixed on the output shaft of the second driving member, a first rack and a second rack that mesh with the gear respectively, one end of the first rack is fixed on the second rack, the second rack is fixed on the fourth rack, the first rack and the second rack are arranged parallel to each other and spaced apart, and the driving gear is arranged between the second rack and the fourth rack.

[0034] Beneficial effects: Under the coordinated control of the second driving component and the transmission structure, the large guide frame moves backward to forward, while the small guide frame moves forward to backward. Through this reverse synchronous driving mechanism, the first and third plates achieve precise opposite displacement, thereby driving their respective installed cutters to converge at the set position and jointly complete the shearing of the hollow cylindrical mold blank. This design not only ensures the synchronicity and coordination of the shearing action but also improves the stability and efficiency of the shearing process, helping to ensure a smooth cut and clean movements. Attached Figure Description

[0035] Figure 1 This is a front view of a dual-station blow molding production equipment according to the present invention;

[0036] Figure 2 yes Figure 1 Front view of a dual-station blow molding production line;

[0037] Figure 3 yes Figure 1A structural view of the mold closing mechanism of a dual-station blow molding production equipment;

[0038] Figure 4 yes Figure 3 A schematic diagram of the central mold mechanism excluding the fourth support plate;

[0039] Figure 5 yes Figure 4 Another perspective structural diagram of the central mold mechanism;

[0040] Figure 6 yes Figure 3 A partial structural diagram of the central mold-closing mechanism;

[0041] Figure 7 This is a schematic diagram of the blow molding die;

[0042] Figure 8 This is a cross-sectional view of one state of the air blowing component in a blow molding die;

[0043] Figure 9 This is a cross-sectional view of the air blowing component in a blow molding die in another state;

[0044] Figure 10 yes Figure 1 A schematic diagram of the shearing mechanism in a dual-station blow molding production equipment;

[0045] Figure 11 yes Figure 10 Top view of the shearing mechanism;

[0046] Figure 12 yes Figure 1 A schematic diagram of the cutting mechanism of a dual-station blow molding production equipment.

[0047] Reference numerals: 1 - Frame; 2 - Feed inlet; 3 - Screw conveyor; 4 - Die head; 5 - Shearing mechanism; 6 - Mold closing mechanism; 7 - Air blowing mechanism; 8 - Cutting mechanism; 9 - First support plate; 10 - Second support plate; 11 - Third support plate; 12 - Fourth support plate; 13 - Second gear; 14 - Rotating shaft; 15 - Through hole; 16 - Mold mounting plate; 17 - Drive motor; 18 - First gear; 19 - Turntable; 20 - Arc groove; 21 - Guide plate; 22 - Guide rail; 23 - Slider; 24 - First bevel gear set; 25 - First transmission shaft; 26 - Second bevel gear set; 27 - Third gear; 28 - Rack; 29 - Mounting bracket; 30 - Second transmission shaft; 31 - Mold base plate; 32 - Inner template; 33 - Mounting hole; 34 - Short air inlet pipe; 35 - Guide cavity; 36 - Pipe body; 37 - Drive cavity; 38 - Telescopic drive structure; 39 - Conical platform; 40 - Spring; 41 - Buffer cavity; 42 - Vent pipe; 43 - First air outlet; 44 - Sealing block; 45 - First connecting hole; 46 - Second air outlet; 47 - Second air outlet; 48 - Upper fixing plate; 49 - Lower fixing plate; 50 - Front panel; 51 - Large guide frame; 52 - First strip plate; 53 - Second strip plate; 54 - Small guide frame; 55 - Third strip plate; 56 - Drive gear; 57 - First rack; 58 - Second rack; 59 - Cutter; 60 - Electric telescopic rod; 61 - Rotary motor; 62 - Cutting blade. Detailed Implementation

[0048] The following is a detailed description of a dual-station blow molding production equipment according to the present invention, with reference to the accompanying drawings and specific embodiments:

[0049] like Figure 1 and Figure 2 As shown, a dual-station blow molding production equipment of the present invention includes a frame 1 fixed on the ground, an extrusion mechanism, a mold clamping mechanism 6, a shearing mechanism 5, an air blowing mechanism 7, and a cutting mechanism 8. The extrusion mechanism is fixed on the frame 1 and includes a spiral conveyor cylinder 3 horizontally fixed to the top of the frame 1 and a die head 4 vertically fixed on the frame 1. The die head 4 is connected to the spiral conveyor cylinder 3. Plastic raw materials are extruded inside the spiral conveyor cylinder 3 and then extruded from the die head 4 into a hollow cylindrical mold blank. In this embodiment, a feed port 2 is fixed at one end of the spiral conveyor cylinder 3. A spiral conveying shaft is provided inside the spiral conveyor cylinder 3, and a cast aluminum heating ring is installed on the outside of the spiral conveyor cylinder 3. Plastic particles enter the spiral conveyor cylinder 3 from the feed port 2. The spiral conveying shaft and the spiral conveyor cylinder 3 extrude and convey the plastic particles. The cast aluminum heating ring is used to heat the plastic particles inside the spiral conveyor cylinder 3 until the plastic particles become molten and enter the die head 4, from which a hollow cylindrical mold blank is extruded.

[0050] The mold closing mechanism 6 is located below the mold head 4. There are two sets of mold closing mechanisms 6. The two sets of mold closing mechanisms 6 alternately receive the mold blank below the mold head 4. The two sets of mold closing mechanisms 6 move in opposite directions after they wrap around the mold blank, so that they can move out from under the mold head 4 in time and avoid interfering with the other set of mold closing mechanisms 6 receiving the mold blank.

[0051] like Figure 3 - Figure 6 As shown, the mold closing mechanism 6 includes a turntable 19 and four mold mounting plates 16 that reciprocate radially along the turntable 19. Blow molding molds are fixed on the mounting plates. After the four blow molding molds are closed, they form a cylindrical closed cavity to enclose the hollow cylindrical mold blank in the closed cavity.

[0052] Specifically, the mold clamping mechanism 6 includes a first support plate 9, a second support plate 10, and a third support plate 11 arranged sequentially from bottom to top. A drive motor 17 is fixedly arranged between the first support plate 9 and the second support plate 10. The output shaft of the drive motor 17 is located above the drive motor 17. A turntable 19 is fixed on the output shaft of the drive motor 17 and is located above the third support plate 11. The turntable 19 has four vertically penetrating arc-shaped grooves 20, which are evenly distributed around the circumference of the turntable 19. Four guide sliding mechanisms are evenly distributed around the radial outer side of the turntable 19, extending radially along the turntable 19. The guide sliding mechanisms are located on the third support plate 11 and include guide posts arranged in the arc-shaped grooves 20 and adapted to guide the sliding of the arc-shaped grooves 20. The mold mounting plate 16 is fixed on the guide sliding mechanism.

[0053] Specifically, the guide sliding mechanism includes a guide rail 22 fixed on the third support plate 11, a slider 23 slidably disposed on the guide rail 22, and a guide plate 21 fixed on the slider 23. The guide rail 22 extends radially along the turntable 19 and is spaced apart from the outer circumferential surface of the turntable 19. The guide plate 21 is L-shaped and includes a first fixed plate fixedly connected to the slider 23 and a second fixed plate fixed perpendicularly to the first fixed plate. The mold mounting plate 16 is fixedly connected to the second fixed plate, and the guide post is fixed on the first fixed plate. When the turntable 19 rotates clockwise, the guide post slides in the arc groove 20, and the guide rail 22 limits the movement of the slider 23 and the guide plate 21, causing the slider 23 and the guide plate 21 to move radially inward along the turntable 19. When the turntable 19 rotates counterclockwise, the guide post slides in the arc groove 20, and the guide rail 22 limits the movement of the slider 23 and the guide plate 21, causing the slider 23 and the guide plate 21 to move radially outward along the turntable 19, thereby realizing the reciprocating movement of the mold mounting plate 16 radially along the turntable 19. When the mold mounting plate 16 moves radially inward along the turntable 19, the four blow molds close, thereby forming a cavity for blow molding the car dust cover. When the mold mounting plate 16 moves radially outward along the turntable 19, the four blow molds separate, thereby realizing the separation of the blow mold from the car dust cover.

[0054] The mold clamping mechanism includes a fourth support plate 12 spaced above the third support plate 11. A mounting bracket 29 is fixed to the lower surface of the fourth support plate 12. In this embodiment, the mounting bracket 29 is a rectangular frame. A first gear 18 is fixed on the output shaft of the drive motor 17. The first gear 18 is located between the second support plate 10 and the third support plate 11, and is located below the turntable 19. Four rotating shafts 14 are rotatably arranged between the second support plate 10 and the fourth support plate 12. The third support plate 11 has clearance holes for the rotating shafts 14 to pass through and to be clearance-fitted with the rotating shafts 14. A second gear 13 is fixed to the lower end of each rotating shaft 14. Four second gears 13 are evenly distributed around the first gear 18. The second gears 13 mesh with the first gear 18 for transmission. A guide member is fixed above the mold mounting plate 16. The guide member is slidably arranged relative to the mounting bracket 29, so that the mold mounting plate 16 can be pushed inward or pulled outward along the rotating shaft 14 radially.

[0055] In this embodiment, the rotating shaft 14 and the guide are connected by a transmission mechanism so that the movement of the guide can push or pull the mold mounting plate 16 above.

[0056] A first drive shaft 25 is rotatably mounted on the lower end of the fourth support plate 12. A first bevel gear set 24 is mounted on the upper end of the rotating shaft 14 and one end of the first drive shaft 25 to achieve a transmission connection between the rotating shaft 14 and the first drive shaft 25. A second drive shaft 30 is rotatably mounted on the mounting bracket 29. A second bevel gear set 26 is mounted on one end of the second drive shaft 30 and one end of the first drive shaft 25 to achieve a transmission connection between the first drive shaft 25 and the second drive shaft 30. A third gear 27 is fixed on the second drive shaft 30. The guide component is a rack 28 that slides relative to the mounting bracket 29. The rack 28 meshes with the third gear 27 for transmission. The rack 28 is fixedly connected to the upper end of the mold mounting plate 16. In this embodiment, to facilitate the guidance of the rack 28, guide blocks are provided on the mounting bracket 29. A guide groove is formed between adjacent guide blocks to guide the movement of the rack 28. In this embodiment, the moving direction of the rack 28 is radial to the turntable 19, and the extending direction of the rack 28 is vertically aligned with the guide rail 22 in the guide sliding mechanism. The fourth support plate 12 has a through hole 15 that avoids the mold mounting plate 16.

[0057] like Figure 7 As shown, the blow molding die includes a mold base plate 31 fixedly connected to a mold mounting plate 16 and an inner mold plate 32 fixedly connected to the mold base plate 31. Both the mold mounting plate 16 and the mold base plate 31 are arc-shaped plates. The outer peripheral surface of the inner mold plate 32 is arc-shaped and adapted to the mold base plate 31. When the four mold mounting plates 16 move toward the center of the turntable 19 and are assembled into a cylinder, the four blow molding dies are also assembled. The inner surface of the inner mold plate 32 forms a cavity adapted to the outer surface of the car dust cover. An installation hole 33 extending in the vertical direction is provided above the inner mold plate 32. An air blowing component is fixed in the installation hole 33 to blow air between the car dust cover and the inner mold plate 32 after the car dust cover has cooled and solidified.

[0058] like Figure 8 and Figure 9 As shown, the air blowing assembly includes a tube 36 fixed in the mounting hole 33. The tube 36 has a driving cavity 37 and a buffer cavity 41 communicating with the driving cavity 37. The end of the driving cavity 37 away from the buffer cavity 41 has a guide cavity 35. The tube 36 is fixed with an air inlet short pipe 34. One end of the air inlet short pipe 34 is used to be fixedly connected to the air cooler, and the other end of the air inlet short pipe 34 extends into the guide cavity 35. The tube 36 has a connecting port, which enables the buffer cavity 41 to communicate with the cavity of the inner template 32. The driving cavity 37 is equipped with a driving assembly.

[0059] The drive assembly includes a vent pipe 42 that is slidably disposed in the guide cavity 35, drive cavity 37, and buffer cavity 41. One end of the vent pipe 42 located in the guide cavity 35 is slidably and sealingly fitted with the air inlet short pipe 34. A conical platform 39 is fixed on the vent pipe 42 and disposed in the drive cavity 37. The drive assembly also includes a telescopic drive structure 38, the telescopic direction of which is perpendicular to the extension direction of the vent pipe 42, and the telescopic end of the telescopic drive structure 38 is an inclined surface adapted to the inclination of the conical platform 39. A spring 40 is also disposed in the drive cavity 37, the spring 40 being sleeved on the vent pipe 42 and located between the conical platform 39 and the side wall of the drive cavity 37. A sealing element is disposed at the connection between the drive cavity 37 and the buffer cavity 41 of the vent pipe 42 to achieve a seal between the drive cavity 37 and the buffer cavity 41. A blocking block 44 is provided at one end of the vent pipe 42 facing the connection port. The blocking block 44 includes a blocking section adapted to the connection port and a guide section adapted to the guide sliding of the buffer chamber 41. The guide section is fixedly connected to the blocking section. A first air outlet 43 with internal and external communication is opened on the pipe section of the vent pipe 42 located in the buffer chamber 41. A first connecting hole 45 is opened on the guide section to achieve communication between the two sides of the guide section. A second air outlet 46 with communication with the vent pipe 42 is opened on the blocking section. The drive assembly can control the blocking block 44 to block or open the connection port by means of the inclined surface of the telescopic end of the telescopic drive structure 38 being adapted to the conical platform 39 and the spring 40 being provided between the conical platform 39 and the side wall of the drive chamber 37.

[0060] Specifically, the sealing status of the sealing block 44 of the air blowing assembly at the connection port is as follows: Figure 8 As shown, the telescopic end of the telescopic drive structure 38 moves downward, pushing the conical platform 39. The spring 40 contracts, causing the conical platform 39 to move the vent pipe 42 toward the connecting port, thereby inserting the sealing element of the sealing block 44 into the connecting port to seal it. At this time, the guide section facing the connecting port is in close contact with the side wall of the buffer chamber 41, causing the side wall of the buffer chamber 41 to seal the first connecting hole 45. The second air outlet 46 is located in the connecting port, causing the side wall of the connecting port to seal the second air outlet 46. The opening state of the sealing block 44 of the air blowing assembly with respect to the connecting port is as follows. Figure 9 As shown, the telescopic end of the telescopic structure moves upward. At this time, the spring 40 returns to its original position and pushes the conical platform 39 away from the communication port, thereby pulling the sealing block 44 out of the communication port to open the communication port. At this time, a gap is formed between the side of the guide section facing the communication port and the side wall of the buffer cavity 41, thereby achieving communication between the two sides of the guide section through the first communication hole 45. The second air outlet 46 is located in the buffer cavity 41 and can supply air to the communication port through the first air outlet 43 and the second air outlet 46 respectively, so that the gas enters between the molded car dust cover and the inner template 32 through the communication port, thereby helping the car dust cover to detach from the inner template 32.

[0061] The shearing mechanism 5 is mounted on the frame 1, such as... Figure 10 and Figure 11 As shown, the shearing mechanism 5 includes a cutter 59 disposed at the mold head 4 that can move relative to the mold head 4 to cut the hollow cylindrical mold blank, so that the length of the mold blank is equivalent to the length of the blow molding mold.

[0062] Specifically, the shearing mechanism 5 includes an upper fixed plate 48 and a lower fixed plate 49 fixed to the frame 1. A front panel 50 is fixed to the front ends of the upper fixed plate 48 and the lower fixed plate 49. A large guide frame 51 and a small guide frame 54 are slidably arranged on the front panel 50. The small guide frame 54 is arranged in the large guide frame 51. The large guide frame 51 includes a first plate 52 located on the front side of the front panel 50 and a second plate 53 located on the rear side of the front panel 50. The large guide frame 51 also includes a first fixing rod that fixes the first plate 52 and the second plate 53 to form a frame. The first fixing rod passes through the front panel 50 and slides in a guide-sliding engagement with the front panel 50. The small guide frame 54 includes a third plate 55 located on the front side of the front panel 50 and a fourth plate located on the rear side of the front panel 50. The small guide frame 54 also includes a second fixing rod that fixes the third plate 55 and the fourth plate to form a frame. The second fixing rod passes through the front panel 50 and slides in a guide-sliding engagement with the front panel 50.

[0063] The first plate 52 and the third plate 55 are arranged opposite each other, and cutters 59 are fixed on opposite sides of the first plate 52 and the third plate 55 respectively; the shearing mechanism 5 also includes a second driving member that drives the large guide frame 51 and the small guide frame 54 to move relative to each other and a transmission structure that is connected to the second driving member. In this embodiment, the second driving member is a first driving motor. The second driving member is fixed on the lower fixed plate 49. The transmission structure includes a drive gear 56 fixed to the output shaft of the second drive member, a first rack 57 and a second rack 58 respectively meshing with the gear. One end of the first rack 57 is fixed to the second plate 53, and the second rack 58 is fixed to the fourth plate. The first rack 57 and the second rack 58 are arranged parallel to each other and spaced apart. The drive gear 56 is located between the second plate 53 and the fourth plate. When the second drive member reverses its operation, it drives the drive gear 56 to rotate counterclockwise. The drive gear 56 drives the first rack 57 to move from front to back, and at the same time drives the second rack 58 to move from back to front. The first rack 57 pulls the large guide frame 51 to move from front to back, and the second rack 58 pulls the small guide frame 51. The frame 54 moves from back to front, causing the first plate 52 to move from front to back, while the third plate 55 moves from back to front, thus bringing the two cutters 59 closer together and aligning them to cut the mold blank. Then, the second drive unit rotates clockwise, driving the drive gear 56 to rotate clockwise. The drive gear 56 drives the first rack 57 to move from back to front, while simultaneously driving the second rack 58 to move from front to back. The first rack 57 pulls the large guide frame 51 to move from back to front, and the second rack 58 pulls the small guide frame 54 to move from front to back, thus causing the first plate 52 to move from back to front, while the third plate 55 moves from front to back, achieving relative separation of the cutters 59.

[0064] The air blowing mechanism 7 is mounted on the frame 1, with one set of air blowing mechanisms 7 on each of the left and right sides of the mold head 4. In this embodiment, the air blowing mechanism 7 is slidably mounted on the frame with vertical guides. After the mold closing mechanism encloses the car dust cover mold blank in the sealed cavity, the mold closing mechanism moves along the guide rail to directly below the air blowing mechanism 7. Then, the air blowing mechanism 7 moves downward to blow air onto the car dust cover mold blank in the mold closing mechanism. After the car dust cover is formed and cooled, the four blow molds of the mold closing mechanism separate, realizing the separation of the blow mold from the car dust cover. At this time, the car dust cover is still fixed to the air blowing port of the air blowing mechanism. The air blowing mechanism moves upward to move the car dust cover relative to the blow molding mold upward, thereby separating the molded car dust cover from the mold closing mechanism in the vertical direction. Then, the mold closing mechanism moves along the slide rail guide to directly below the mold head to receive the next section of the car dust cover mold blank. After the mold closing mechanism leaves directly below the air blowing mechanism, the air blowing mechanism moves downward with the car dust cover. After the clamping mold moves along the slide rail guide to directly below the air blowing mechanism 7 and clamps the car dust cover, the air blowing mechanism 7 lowers the car dust cover and moves the car dust cover to the next process through the clamping mold.

[0065] In this embodiment, the air blowing mechanism 7 includes a fixed frame that moves vertically along the frame and is located on the front side of the frame 1. An electric push rod capable of extending and retracting in the vertical direction is fixed to the fixed frame. An air blowing rod is fixed to the retractable end of the electric push rod, and the air blowing rod is connected to an air source. An air blowing port is provided at the lower end of the air blowing rod. In this embodiment, the clamping mold is correspondingly located on one side of the mold closing mechanism, and the clamping mold can move left and right along the slide rail. The air blowing mechanism 7 relatively fixes the car dust cover after the mold closing mechanism leaves the car dust cover, thereby enabling the air blowing mechanism 7 to drive the car dust cover to move up and down. The principle and related structure of the air blowing mechanism 7 relative to the car dust cover are existing technologies and will not be described in detail here.

[0066] A cutting mechanism 8 is located on the side of the air blowing mechanism 7 away from the mold head 4. After the air blowing mechanism 7 lowers the car dust cover, it moves the car dust cover to the cutting mechanism 8 by clamping the mold. In this embodiment, as shown... Figure 12 As shown, the cutting mechanism 8 includes an electric telescopic rod 60 fixed to the front side of the frame 1, which can extend and retract in the front-rear direction. A mounting frame is fixed to the telescopic end of the electric telescopic rod 60. A rotary motor 61 is fixed above the mounting frame. The output shaft of the rotary motor 61 extends in the vertical direction. A cutting blade 62 is fixed on the output shaft of the rotary motor 61. The cutting blade 62 includes a circular horizontal connecting plate. An L-shaped blade body is fixed to the edge of the horizontal connecting plate. The blade body includes a vertical rod extending in the vertical direction and a blade head that is integrally and perpendicularly arranged with the vertical rod. The extension and retraction of the electric telescopic rod 60 can drive the mounting frame to move in the front-rear direction, thereby realizing the movement of the cutting blade 62 in the front-rear direction. When the cutting blade 62 moves to the position of the car dust cover, the rotary motor 61 works, driving the cutting blade 62 to rotate, so that the cutting blade 62 rotates around the rotating shaft of the rotary motor 61, thereby realizing the cutting of the end of the car dust cover.

[0067] This invention provides a dual-station blow molding equipment for the production of automotive dust covers. Its mold-closing mechanism employs a radially parting design with four blow molding molds to effectively solve the problems of difficult demolding and easy breakage of corrugated dust covers in traditional split molds. Specifically, the mold-closing mechanism includes four mold mounting plates that reciprocate radially along a turntable, each mounting plate holding a blow molding mold. The four blow molding molds are precisely aligned during mold closing, collectively forming a complete automotive dust cover cavity. During the blow molding process, a preheated tubular preform is first placed between the four blow molding molds, and then the four molds close to form the cavity. Compressed air is then introduced into the preform, causing it to expand and completely adhere to the inner wall surface of the mold. After cooling and solidification, the four blow molding molds move synchronously outwards radially along the turntable, achieving separation from the formed dust cover. The core advantage of the four-blow molding mold parting design is that the contact arc between each independent blow molding mold and the corrugated surface of the automotive dust cover is significantly reduced, thereby greatly reducing localized bonding stress during mold opening. This design effectively avoids the problems of product stretching, tearing, or even structural damage caused by excessive overall covering force during demolding of traditional two-part molds, significantly improving the dimensional stability, surface quality, and overall production qualification rate of automotive dust covers.

[0068] Furthermore, this invention optimizes the guiding system of the mold mounting plate. By adding an upper guide component and its corresponding transmission mechanism, it achieves synchronous linkage with the existing turntable and guide sliding mechanism, significantly improving the overall stability and trajectory accuracy of the mold mounting plate during high-speed reciprocating motion. This design allows the guide component to continuously apply constraint and support to the upper part of the mold mounting plate, thus ensuring that the mold mounting plate is constrained not only in the horizontal direction but also effectively pushed and limited in the vertical direction when it moves radially along the turntable. This bidirectional constraint mechanism effectively suppresses vertical displacement and vibration that may occur during movement. Therefore, the guide component and the guide plate form a completely synchronous linkage. During mold closing and opening, both work together to apply uniform and synchronous constraint force to the mold mounting plate, significantly offsetting vibrations, swaying, or slight deformations that may be induced by high-speed operation or changes in load, ensuring that the mold mounting plate always moves smoothly and accurately along the preset radial trajectory.

[0069] In this invention, by rationally opening mounting holes on the surface of the inner template of the blow molding mold and securely mounting an air blowing component within these holes, the air blowing component can output controllable airflow into the gap between the dust cover and the inner template after the dust cover has cooled and solidified. The blowing action of the air blowing component effectively reduces the adhesion stress between the two, significantly accelerating the separation speed of the dust cover from the inner template. Furthermore, the air blowing component, with its separate structure from the blow molding mold, works in synergy to further ensure that the molded dust cover can smoothly and stably detach from the inner template, avoiding product deformation or damage caused by excessive demolding resistance.

[0070] In the above embodiments, the shearing mechanism includes an upper fixed plate and a lower fixed plate fixed on the frame. A front panel is fixed to the front end of the upper and lower fixed plates. A large guide frame and a small guide frame are slidably arranged on the front panel. The small guide frame is disposed in the large guide frame. The large guide frame includes a first plate located on the front side of the front panel and a second plate located on the rear side of the front panel. The small guide frame includes a third plate located on the front side of the front panel and a fourth plate located on the rear side of the front panel. The first plate and the third plate are arranged opposite each other. Cutting blades are fixed on the opposite sides of the first plate and the third plate, respectively. The shearing mechanism also includes a second driving member that drives the large guide frame and the small guide frame to move relative to each other and a transmission structure that is pulsatorically connected to the second driving member. In other embodiments, the shearing mechanism may only have a large guide frame. A fixed cutting blade is fixed on the front panel, and a movable cutting blade is fixed on the first plate of the large guide frame. This allows the large guide frame to move back and forth relative to the front panel, thereby realizing the movement of the movable cutting blade toward the fixed cutting blade, thus realizing the cutting of the mold blank.

Claims

1. A two-station blow molding production apparatus, characterized by, include: The frame is fixed to the ground; The extrusion mechanism is fixed on the frame. The extrusion mechanism includes a spiral conveyor cylinder fixed horizontally on the top of the frame and a die head fixed vertically on the frame. The die head is connected to the spiral conveyor cylinder. The plastic raw material is squeezed inside the spiral conveyor cylinder and then extruded from the die head into a hollow cylindrical die blank. The slide rail extends and is fixed to the front side of the frame in the left-right direction; The mold closing mechanism is located below the mold head. There are two sets of mold closing mechanisms. The bottom of the mold closing mechanism slides and engages with the guide rail. The two sets of mold closing mechanisms move alternately to the bottom of the mold head to alternately receive the hollow cylindrical mold blank. The mold closing mechanism includes a turntable and four mold mounting plates that reciprocate radially along the turntable. Blow molding molds are fixed on the mounting plates. After the four blow molding molds are closed, they form a closed cavity to enclose the hollow cylindrical mold blank in the closed cavity. A shearing mechanism is mounted on the frame. The shearing mechanism includes a cutter mounted at the die head that can move relative to the die head to cut the hollow cylindrical die blank. The air blowing mechanism is guided and slidably mounted on the frame. One set of air blowing mechanism is set on each of the left and right sides of the mold head. The mold closing mechanism can move back and forth between the mold head and the air blowing mechanism. After the mold closing mechanism wraps the mold blank, it moves to the air blowing mechanism, and the air blowing mechanism blows air to shape the mold blank. The mold clamping mechanism includes a first support plate, a second support plate, and a third support plate arranged sequentially from bottom to top. A drive motor is fixedly installed between the first and second support plates. The turntable is fixed on the output shaft of the drive motor and is located above the third support plate. The turntable has four vertically penetrating arc-shaped grooves, which are evenly distributed around the circumference of the turntable. Four guide sliding mechanisms are evenly distributed around the radial outer side of the turntable and extend radially. The guide sliding mechanisms are installed on the third support plate and include guide posts installed in the arc-shaped grooves and adapted to guide the sliding of the arc-shaped grooves. The mold mounting plate is fixed on the guide sliding mechanism. The guide sliding mechanism includes a guide rail fixed on the third support plate, a slider slidably mounted on the guide rail, and a guide plate fixed on the slider. The guide rail extends radially along the turntable. The guide plate is L-shaped and includes a first fixed plate fixedly connected to the slider and a second fixed plate fixed perpendicularly to the first fixed plate. The mold mounting plate is fixedly connected to the second fixed plate, and the guide post is fixed on the first fixed plate. The mold clamping mechanism includes a fourth support plate spaced above the third support plate. A mounting bracket is fixed to the lower surface of the fourth support plate. A first gear is fixed to the output shaft of the drive motor and is positioned between the second and third support plates. Four rotating shafts are rotatably arranged between the second and fourth support plates. The third support plate has clearance holes for the rotating shafts to pass through. A second gear is fixed to the lower end of each rotating shaft. Four second gears are arranged circumferentially around the first gear. The second gears mesh with the first gears for transmission. A guide member is fixed above the mold mounting plate. The guide member is slidably arranged relative to the mounting bracket. The rotating shafts and the guide member are connected by a transmission mechanism so that the movement of the guide member can push the mold mounting plate upwards.

2. The dual-station blow molding production equipment according to claim 1, characterized in that, The lower end of the fourth support plate is rotatably equipped with a first drive shaft, and the upper end of the shaft is equipped with a first bevel gear set to achieve a transmission connection between the shaft and the first drive shaft; a second drive shaft is rotatably equipped on the mounting bracket, and a second bevel gear set is equipped with one end of the second drive shaft and the first drive shaft to achieve a transmission connection between the first drive shaft and the second drive shaft; a third gear is fixed on the second drive shaft, and the guide is a rack that slides relative to the mounting bracket, and the rack meshes with the third gear for transmission; the fourth support plate has a through hole to avoid the mold mounting plate.

3. A double station blow molding production apparatus according to claim 1 or 2, characterized in that, The blow molding mold includes a mold base plate fixedly connected to a mold mounting plate and an inner template fixedly connected to the mold base plate. Both the mold mounting plate and the mold base plate are arc-shaped plates. The outer circumferential surface of the inner template is an arc shape adapted to the mold base plate. When the four mold mounting plates move toward the center of the turntable and are assembled into a cylinder, the inner surface of the inner template forms a cavity adapted to the outer surface of the car dust cover. An installation hole is provided above the inner template, and an air blowing component is fixed in the installation hole to blow air between the car dust cover and the inner template after the car dust cover has cooled and solidified.

4. A twin station blow molding production apparatus according to claim 3, wherein The air blowing assembly includes a tube fixed in the mounting hole, a driving cavity and a buffer cavity communicating with the driving cavity in the tube, a guide cavity in the end of the driving cavity away from the buffer cavity, an air inlet short pipe fixed to the tube, one end of the air inlet short pipe for fixed connection with the air cooler, and the other end of the air inlet short pipe extending into the guide cavity; a communication port is provided in the tube, which enables communication between the buffer cavity and the inner template cavity; a driving assembly is provided in the driving cavity.

5. A twin station blow molding production apparatus according to claim 4, wherein The drive assembly includes a vent pipe that is slidably disposed in a guide cavity, a drive cavity, and a buffer cavity. One end of the vent pipe in the guide cavity is slidably sealed with an air inlet short pipe. A conical platform is fixed on the vent pipe and disposed in the drive cavity. The drive assembly also includes a telescopic drive structure. The telescopic direction of the telescopic drive structure is perpendicular to the extension direction of the vent pipe. The telescopic end of the telescopic drive structure is an inclined surface adapted to the inclination of the conical platform. A spring is also disposed in the drive cavity. The spring is sleeved on the vent pipe and is located between the conical platform and the side wall of the drive cavity. A blocking block is disposed at one end of the vent pipe facing the connection port. The blocking block includes a blocking section adapted to the connection port and a guide section adapted to the guide sliding of the buffer cavity. The guide section and the blocking section are fixedly connected. A first air outlet with internal and external communication is opened on the pipe section of the vent pipe located in the buffer cavity. A first connecting hole is opened on the guide section. A second air outlet communicating with the vent pipe is opened on the blocking section.

6. A dual-station blow molding production equipment according to claim 1 or 2, characterized in that, The shearing mechanism includes an upper fixed plate and a lower fixed plate fixed to the frame. A front panel is fixed to the front end of the upper fixed plate and the lower fixed plate. A large guide frame and a small guide frame are slidably arranged on the front panel. The small guide frame is set in the large guide frame. The large guide frame includes a first plate located on the front side of the front panel and a second plate located on the rear side of the front panel. The small guide frame includes a third plate located on the front side of the front panel and a fourth plate located on the rear side of the front panel. The first plate and the third plate are arranged opposite each other. Cutting blades are fixed on the opposite sides of the first plate and the third plate respectively. The shearing mechanism also includes a second driving member that drives the large guide frame and the small guide frame to move relative to each other and a transmission structure that is connected to the second driving member.

7. A twin station blow molding production apparatus according to claim 6, wherein The second driving component is fixed on the lower fixed plate. The transmission structure includes a driving gear fixed on the output shaft of the second driving component, a first rack and a second rack that mesh with the gear respectively. One end of the first rack is fixed on the second plate, and the second rack is fixed on the fourth plate. The first rack and the second rack are arranged in parallel and spaced apart. The driving gear is arranged between the second plate and the fourth plate.

Images