High-precision stable variable distance mechanism in bottle blowing machine

Abstract

The present application relates to the field of bottle blowing machine, especially to a high-precision stable variable distance mechanism in a bottle blowing machine, comprising: a support, a guide blank groove is arranged on the support; a ring-shaped guide rail is arranged on the support, an initial area, a variable distance maintaining area, a bottle pushing area and a material taking area are arranged on the ring-shaped guide rail; a hinge plate assembly is composed of hinge plates which are sequentially hinged together, second and third circular guide members are arranged on the hinge plates, first and second circular guide members are rollingly clamped in the ring-shaped guide rail; a plurality of bottle pushing assemblies are fixed on corresponding hinge plates, bottle pushing assemblies in the initial area are in a non-bottle pushing state, bottle pushing assemblies in the variable distance maintaining area are changed to a bottle pushing state, bottle pushing assemblies in the bottle pushing area are in a bottle pushing state, bottle pushing assemblies in the material taking area cooperate with a material taking mechanism to take out bottle blanks; a sprocket drives the hinge plate assembly to move along the ring-shaped guide rail. The present application is not easy to be stretched during operation, thereby having high stability and high positioning precision.

Description

Technical Field

[0001] This invention relates to the field of blow molding technology, and more particularly to a high-precision stable pitch mechanism in blow molding machines. Background Technology

[0002] In blow molding machines, a pitch-changing mechanism is needed to adjust the spacing of densely packed preforms according to the cavity spacing of the blow molding die. Currently, most machines on the market use equally spaced crossbars on a synchronous belt or equally spaced rigid rods on a chain to adjust the spacing of the preforms. Once the preforms have been adjusted and moved to the designated position, a material handling mechanism picks them up and sends them into the blow molding die for blow molding. However, the following drawbacks exist when using synchronous belts or chains: 1. Synchronous belts are elastic and will stretch and deform under long-term load and high-speed start-stop, resulting in inaccurate positioning accuracy. The spacing between preforms cannot be guaranteed, and the feeding mechanism cannot smoothly grab the preforms and send them into the blow molding mold; 2. Synchronous belts are prone to aging or corrosion due to direct contact with high-temperature preforms; 3. Chains generate more noise and vibration, and the chains are thinner and are also prone to stretching under long-term load, resulting in inaccurate positioning of preforms. Moreover, the chain and sprocket are prone to wear after long-term adhesion, resulting in unstable operation and jumping. The jumping chain will affect the rigid rods, causing the rigid rods to repeatedly hit the outer wall of the preforms, which can easily damage the appearance of the preforms and affect the quality of the finished product; 4. The connection stability between the rigid rods and the chain is poor, and the rigid rods are prone to failure when the bottles are being moved. Summary of the Invention

[0003] The purpose of this invention is to provide a high-precision stable variable pitch mechanism for blow molding machines that is stable in operation and not easily stretched during operation, thus preventing inaccurate positioning.

[0004] To achieve the above objectives, the technical solution adopted by this invention is: a high-precision stable pitch-changing mechanism in a blow molding machine, comprising: a support frame with a preform guide groove for guiding the movement of the preform; an annular guide rail mounted on the support frame, having an initial zone, a displacement maintenance zone, a bottle-shifting zone, and a material-taking zone, the bottle-shifting zone and the material-taking zone being adjacent to and parallel to the preform guide groove; and a hinge plate assembly composed of hinge plates hinged together end to end, with two first circular guide members rotatably mounted at the hinge joint of every two hinge plates, and a second circular guide member rotatably mounted on any hinge plate. The first and second circular guide members are rolled and engaged in the annular guide rail, and the first and second circular guide members cooperate with the annular guide rail to constrain the longitudinal direction and... Lateral oscillation; several bottle-moving assemblies, fixed on corresponding hinge plates, with equal spacing between adjacent bottle-moving assemblies. Driven by the hinge plate assembly, the bottle-moving assemblies move along the annular guide rail. Bottle-moving assemblies in the initial zone are in a non-bottle-moving state, bottle-moving assemblies in the displacement maintenance zone change from a non-bottle-moving state to a bottle-moving state, bottle-moving assemblies in the bottle-moving zone are in a bottle-moving state and push the preforms in the preform guide groove, and bottle-moving assemblies in the material-taking zone can switch between bottle-moving and non-bottle-moving states and cooperate with the material-taking mechanism to take out the preforms; a sprocket is connected to the output shaft of a variable-pitch reduction motor fixed on the bracket, which drives the hinge plate assembly to move along the annular guide rail. The sprocket is in rolling engagement with the first circular guide and the second circular guide.

[0005] Furthermore, in the aforementioned high-precision stable pitch-changing mechanism of the blow molding machine, the bottle-dispatching assembly includes: a mounting base, a swing arm, and a lever. The mounting base is fixed on a hinge plate, the swing arm is rotatably mounted on the mounting base, and the lever is engaged at the end of the swing arm away from the hinge plate. A third circular guide is rotatably mounted at the end of the swing arm near the hinge plate. A tension spring is provided between the swing arm and the mounting base, and a limit block is provided on the mounting base. The third circular guide on the swing arm of the bottle-dispatching assembly located in the initial zone is unrestricted. Under the action of the tension spring, the swing arm rotates to a vertical position, and the lever points downwards, placing the bottle-dispatching assembly in a position where... In the non-bottle-dispensing state; the third circular guide on the bottle-dispensing assembly in the displacement maintenance zone is gradually restricted, and the swing arm drives the lever to gradually rotate upward to the horizontal, so that the bottle-dispensing assembly changes from the non-bottle-dispensing state to the bottle-dispensing state and maintains the bottle-dispensing state; the third circular guide on the bottle-dispensing assembly in the bottle-dispensing zone is always restricted, and the swing arm and lever remain horizontal, so that the bottle-dispensing assembly is in the bottle-dispensing state; the third circular guide on the bottle-dispensing assembly in the material-taking zone is gradually unrestricted, and under the action of the tension spring, the swing arm drives the lever to gradually rotate to the vertical and the lever is downward, so that the bottle-dispensing assembly changes from the bottle-dispensing state to the non-bottle-dispensing state.

[0006] Furthermore, in the aforementioned high-precision stable variable pitch mechanism of the blow molding machine, the annular guide rail includes: two parallel straight plates, an arc-shaped positioning plate, and an arc-shaped adjusting seat. The two straight plates are fixed on a support, one straight plate is adjacent to the guide groove, and the other straight plate is away from the guide groove. T-shaped straight grooves are provided on the outer walls of both straight plates. An L-shaped limiting plate extends outward from the top wall of the straight plate. A straight guide groove is left between the L-shaped limiting plate and the upper outer wall of the large-diameter section of the T-shaped straight groove. Two first circular guide members at the same hinge point abut against the upper and lower outer walls of the large-diameter section of the T-shaped straight groove in a transverse state. The upper first circular guide member is rolled and locked in the straight guide groove and abuts against the L-shaped limiting plate. The second circular guide member is rolled and locked in the small-diameter section of the T-shaped straight groove in a vertical state and abuts against the upper and lower walls of the small-diameter section. The two ends of the arc-shaped positioning plate are fixed to the two straight plates and are concentric in the arc-shaped positioning plate. A through hole is provided, and the sprocket is located below the arc-shaped positioning plate and coaxially aligned with the through hole. The arc-shaped adjusting seat rests horizontally against two straight plates. An arc groove aligned laterally with the T-shaped straight groove is provided on the arc-shaped adjusting seat. A slide is provided on the support and connected to the two straight plates. The arc-shaped adjusting seat is slidably locked on the slide. An adjusting screw is movably inserted through the slide and is rotatably locked with the arc-shaped adjusting seat. A buffer spring is fitted on the adjusting screw, and an adjusting nut is threaded onto the adjusting screw. The buffer spring rests against the slide and the adjusting nut respectively. The initial zone is located on the arc-shaped adjusting seat and the straight plate away from the guide plate groove. The displacement maintaining zone is located on the straight plate away from the guide plate groove and the arc-shaped positioning plate. A deflecting pressure plate is provided on the straight plate away from the guide plate groove to change the bottle-dispensing assembly from the non-dispensing state to the dispensing state. The arc-shaped positioning plate maintains the bottle-dispensing assembly in the dispensing state. The bottle-dispensing zone and the material picking zone are both located on the straight plate adjacent to the guide plate groove.

[0007] Furthermore, in the aforementioned high-precision stable pitch-changing mechanism of the blow molding machine, a spiral groove is provided on the reversing pressure plate. The phase difference angle between the end and tail of the spiral groove in the axial direction is 90°. The tail is in horizontal contact with the arc-shaped positioning plate, and the bottom wall of the tail is flush with the bottom wall of the arc-shaped positioning plate. The end is adjacent to the initial area, and the end of the spiral groove is in contact with the third circular guide on the vertical swing arm. A guide pressure plate is provided on the straight plate located in the bottle-dispensing area to receive the bottle-dispensing assembly and put it in the bottle-dispensing state. The guide pressure plate is in horizontal contact with the arc-shaped positioning plate, and the bottom wall of the guide pressure plate is flush with the bottom wall of the arc-shaped positioning plate. The arc-shaped positioning plate is in contact with the reversing pressure plate and the guide pressure plate. Part of it also extends outward from the straight plate; a pressure-raising component is provided on the straight plate located in the material picking area to control the bottle-dispensing assembly to change from the bottle-dispensing state to the non-bottle-dispensing state. The pressure-raising component includes: a limiting plate; a connecting rod is rotatably provided on the straight plate located in the material picking area; a number of connecting blocks are spaced apart on the connecting rod and connected to the limiting plate; a connecting rod arm is provided on the connecting rod and is hinged to the pull rod; a servo motor is provided on the straight plate located in the material picking area; a crank is provided on the output shaft of the servo motor; the pull rod is hinged to the eccentric part of the crank; when the limiting plate abuts against the corresponding straight plate, the limiting plate abuts horizontally against the guide pressure plate and extends out of the straight plate, and the bottom wall of the limiting plate is flush with the bottom wall of the guide pressure plate.

[0008] Furthermore, in the aforementioned high-precision stable variable pitch mechanism of the blow molding machine, a through hole is concentrically provided in the arc-shaped positioning plate, and the sprocket is located below the arc-shaped positioning plate and coaxially aligned with the through hole. The sprocket includes an upper row of wheels, a lower row of wheels, and a central shaft. The upper and lower rows of wheels are coaxially arranged at the upper and lower ends of the central shaft, which is connected to the output shaft of the variable pitch reduction motor. Several arc-shaped slots are evenly distributed on the circumferential walls of the upper and lower rows of wheels, and the arc-shaped slots on the upper and lower rows of wheels are coaxially aligned one by one. The curvature of the arc-shaped slots is the same as the curvature of the first circular guide. A wall groove is provided on the circumferential wall of the central shaft, and the second circular guide is rolled and locked in the wall groove in a vertical state.

[0009] Furthermore, in the aforementioned high-precision stable pitch-changing mechanism of the blow molding machine, the connection structure between the hinge plates is as follows: Slots and plugs are respectively provided at both axial ends of the hinge plates. Hinge holes are provided on the two side walls of the slots, and hinge holes are also provided on the plugs. The plug on one hinge plate extends into the slot of another hinge plate. The hinge holes on the plug are coaxially aligned with the two hinge holes on the slot. A hinge shaft rotatably passes through the three aligned hinge holes. Both ends of the hinge shaft extend out of the hinge plates. Connecting plates are movably fitted at both ends of the hinge shaft. A first circular guide is rotatably provided at both ends of the hinge shaft, and the first circular guide abuts against the same side... On the connecting plate, a countersunk hole and two flat threaded holes are provided on the hinge plate. The connecting shaft passes through the second circular guide and extends into the countersunk hole and is connected by a countersunk bolt. The connection structure between the bottle-dispensing assembly and the hinge plate is as follows: two countersunk through holes are provided on the mounting base. Three retaining edges are extended on the wall where the mounting base and the hinge plate are connected. The three retaining edges are arranged in a triangular shape. When the mounting base abuts against the hinge plate, the two countersunk through holes are aligned with the two flat threaded holes and are connected by bolts. The three retaining edges are respectively clamped on the outer walls of the hinge plate on both sides of the plug and on the groove wall of the slot. A second circular guide is rotatably provided on each hinge plate connected to the bottle-dispensing assembly.

[0010] Furthermore, in the aforementioned high-precision stable pitch-changing mechanism of the blow molding machine, protective covers for the hinge plate assembly and bottle-feeding assembly are provided in the initial and displacement-maintaining areas of the annular guide rail. A bottle-protecting channel for the preforms in the bottle-feeding and feeding areas is provided on the support. The bottle-protecting channel is vertically aligned with the preform guide groove and is composed of an inner and outer protective plate. The inner protective plate is fixedly mounted on the support, and the outer protective plate is flipped onto the support. The support located at the intersection of the bottle-feeding and displacement-maintaining areas and the support located at the intersection of the feeding and initial areas are also included. Each frame is equipped with a connecting seat, in which a locking rod is horizontally rotatable. A handle is fitted onto the locking rod. A rotating frame is mounted on the connecting seat, rotating up and down. A locking plate is mounted on the rotating frame. The locking plate has a locking groove that mates with the locking rod. The two ends of the inner protective plate are connected to the two connecting seats respectively, and the two ends of the outer protective plate are connected to the rotating frames on the two connecting seats respectively. When the rotating frame rotates upward until the locking plate abuts against the connecting seat, the outer protective plate and the inner protective plate are parallel to form a bottle protection channel. The locking rod is engaged in the locking groove of the locking plate, and the handle rests against the locking plate.

[0011] Furthermore, in the aforementioned high-precision stable pitch-changing mechanism of the blow molding machine, an inner guide plate is provided on the support, and an outer guide plate is provided on two rotating frames. The preform guide groove is located between the inner and outer guide plates. A bottle-separating component is provided on the rotating frame located at the intersection of the bottle-dispensing area and the displacement-maintaining area, which can push the preforms in batches into the section corresponding to the bottle-dispensing area in the preform guide groove. The bottle-separating component includes: a platform, which is fixed on the rotating frame and located above the outer guide plate. A preform dispensing motor is provided on the platform. A turntable is provided on the output shaft of the preform dispensing motor. Several dispensing blades are evenly distributed on the circumferential wall of the turntable. The turntable drives the dispensing blades to make circular motion above the preform guide groove. A baffle is provided above the inner guide plate.

[0012] Furthermore, in the aforementioned high-precision stable variable pitch mechanism of the blow molding machine, a pressing plate is provided on the support, the pressing plate is located above the guide groove, and an inclined guide plate is provided at the end of the pressing plate near the bottle separating assembly.

[0013] Furthermore, in the aforementioned high-precision stable variable pitch mechanism of the blow molding machine, a material discharge hopper is provided on the support, and the material discharge hopper is located below the intersection of the material collection area and the initial area.

[0014] The advantages of this invention are as follows: 1. The hinge plate assembly achieves rolling friction with the annular guide rail through the rotating first and second circular guide members, which can achieve low frictional resistance and high operating efficiency, making the transmission of the hinge plate assembly extremely smooth, significantly reducing drive energy consumption and load. Moreover, rolling friction greatly reduces wear, giving the equipment an ultra-long service life and extremely low maintenance requirements, and ensuring stable, quiet and low vibration operation. On this basis, the first and second circular guide members, together with the annular guide rail, apply longitudinal and lateral constraint forces to the hinge plate assembly, effectively suppressing lateral or longitudinal swaying of the hinge plate assembly during operation, providing the equipment with extremely high linear motion accuracy, rigidity and repeatability stability.

[0015] 2. The hinge plate assembly is hinged together end to end by the hinge plate, which can improve the overall rigidity of the hinge plate assembly and make it less susceptible to stretching and deformation. The connection structure between the bottle-dispensing assembly and the hinge plate is stable and not prone to failure. Installing the bottle-dispensing assembly on the hinge plate with a second circular guide can further improve the stability of the bottle-dispensing assembly during operation.

[0016] 3. A reversing pressure plate is installed in the displacement maintenance area. The cooperation between the reversing pressure plate and the third circular guide on the swing arm enables the bottle-dispensing assembly to automatically switch to the bottle-dispensing state during operation, eliminating the need for an additional drive mechanism, thus optimizing the structure and reducing costs. A pressure-raising assembly is installed in the material picking area. When the number of preforms in the material picking area reaches the preset quantity, the restriction on the bottle-dispensing assembly in the material picking area can be lifted, and the material picking mechanism can remove the preforms. After the preforms in the material picking area are removed, the restriction on the subsequent bottle-dispensing assembly entering from the bottle-dispensing area can be re-imposed until the number of preforms in the material picking area reaches the preset quantity again, thus improving the level of automation.

[0017] 4. A bottle-separating component is installed at the intersection of the bottle-dispensing area and the displacement-maintaining area. This component can push the preforms in batches to the guide groove section corresponding to the bottle-dispensing area. This allows the preforms, which are densely arranged at the end of the guide groove, to be transported one by one to the area corresponding to the guide groove and the bottle-dispensing area. Then, the bottle-dispensing component, which enters the bottle-dispensing area from the displacement-maintaining area, receives the preforms and pushes them to form a set spacing between them. The orderly cooperation between the bottle-separating component and the bottle-dispensing component can stably push the preforms without damaging them. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the high-precision stable pitch mechanism in the blow molding machine described in this invention.

[0019] Figure 2 yes Figure 1 A schematic diagram of the structure after removing the guide groove, protective cover, bottle protection channel and bottle separating assembly.

[0020] Figure 3 yes Figure 2 A top-down view of the structure.

[0021] Figure 4 yes Figure 2 A schematic diagram of the overall connection structure between the central hinge plate assembly and the bottle-dispensing assembly.

[0022] Figure 5 yes Figure 4 Exploded view of the structure between the central deflector assembly and the hinge plate assembly.

[0023] Figure 6 yes Figure 4 A cross-sectional view of the structure after the central bottle assembly is connected to the hinge plate in the hinge plate assembly.

[0024] Figure 7 yes Figure 2 A schematic diagram of the connection structure between the central directional pressure plate, the arc-shaped positioning plate, and the guide pressure plate.

[0025] Figure 8This is a schematic diagram of the changes in the bottle-dispensing assembly after it is constrained in the reversing pressure plate.

[0026] Figure 9 yes Figure 6 A cross-sectional structural diagram.

[0027] Figure 10 It is a structural diagram showing the pressure-raising assembly, sprocket, and arc-shaped adjustment seat.

[0028] Figure 11 yes Figure 2 A partial cross-sectional view of the central ring guide rail.

[0029] Figure 12 yes Figure 1 A cross-sectional structural diagram. Detailed Implementation

[0030] The technical solution of the present invention will be further described below with reference to the accompanying drawings and preferred embodiments.

[0031] like Figures 1-12 As shown, the high-precision stable variable pitch mechanism in the blow molding machine of the present invention includes: a support 1, on which a guide groove 11 for guiding the movement of the preform is provided; An annular guide rail 2 is mounted on the bracket 1. An initial area 21, a displacement maintenance area 22, a bottle-pulling area 23, and a material-taking area 24 are provided on the annular guide rail 2. The bottle-pulling area 23 and the material-taking area 24 are adjacent to and parallel to the blank guide groove 11. The hinge plate assembly 3 is composed of hinge plates 31 that are hinged together end to end. Two first circular guide members 32 are rotatably provided at the hinge joint of every two hinge plates 31. A second circular guide member 33 is rotatably provided on any hinge plate 31. The first circular guide members 32 and the second circular guide members 33 are rolled and locked in the annular guide rail 2. The first circular guide members 32 and the second circular guide members 33 cooperate with the annular guide rail 2 to constrain the longitudinal and lateral swing of the hinge plate assembly 3. Several bottle-dispensing components 4 are fixed on corresponding hinge plates 31. The spacing between each pair of adjacent bottle-dispensing components 4 is the same. The bottle-dispensing components 4 move along the annular guide rail 2 under the drive of the hinge plate assembly 3. The bottle-dispensing components 4 located in the initial zone 21 are in a non-dispensing state. The bottle-dispensing components 4 located in the displacement maintenance zone 22 change from the non-dispensing state to the dispensing state. The bottle-dispensing components 4 located in the dispensing zone 23 are in the dispensing state and push the bottle preform in the guide groove 11. The bottle-dispensing components 4 located in the material picking zone 24 can switch between the dispensing state and the non-dispensing state and cooperate with the material picking mechanism to pick up the bottle preform. The sprocket 5 is connected to the output shaft of the variable-pitch reduction motor 12 fixed on the bracket 1, which drives the hinge plate assembly 3 to move along the annular guide rail 2. The sprocket 5 is engaged with the first circular guide 32 and the second circular guide 33 in a rolling engagement.

[0032] The sprocket 5 rotates under the drive of the variable-pitch reduction motor 12. The rotating sprocket 5, through the first circular guide 32 and the second circular guide 33 which are engaged with it, drives the hinge plate assembly 3 to move in a ring along the annular guide rail 2. When the bottle-dispensing assembly 4 on the hinge plate assembly 3 moves into the initial zone 21, it is in a non-dispensing state. When the non-dispensing bottle-dispensing assembly 4 enters the displacement holding zone 22 from the initial zone 21, it begins a state transition from non-dispensing to dispensing. When the dispensing assembly 4 in the dispensing state enters the dispensing zone 23, each dispensing assembly 4 contacts a preform in the preform guide groove 11. Driven by the hinge plate assembly 3, the dispensing assembly 4 drives the preform along... As the preform guide groove 11 moves, the bottle-dispensing assembly 4 carries the preform into the picking area 24. When the number of preforms in the picking area 24 reaches a preset number, the picking mechanism extends into the picking area 24 to grab the preforms. The bottle-dispensing assembly 4 in the picking area 24 changes from dispensing to non-dispensing, and no longer interferes with the preforms. The picking mechanism can then remove the preforms from the picking area 24 and transport them to the blow molding die at the next station for blow molding. After the preforms in the picking area 24 are removed, the bottle-dispensing assembly 4 in the picking area 24 changes from non-dispensing to dispensing again. The bottle-dispensing assembly 4 in the subsequent bottle-dispensing area 23 carries the preforms into the picking area 24 until the number of preforms in the picking area 24 reaches a preset number, at which point it cooperates with the picking mechanism to pick up the preforms.

[0033] The hinge plate assembly 3 achieves rolling friction with the annular guide rail 2 through the rotating first circular guide member 32 and the second circular guide member 33. This achieves low frictional resistance and high operating efficiency, making the transmission of the hinge plate assembly 3 extremely smooth, significantly reducing drive energy consumption and load. Moreover, rolling friction greatly reduces wear, giving the equipment an ultra-long service life and extremely low maintenance requirements, and ensuring stable, quiet and low vibration operation. On this basis, the first circular guide member 32 and the second circular guide member 33, together with the annular guide rail 2, apply longitudinal and lateral constraint forces to the hinge plate assembly 3, effectively suppressing lateral or longitudinal swaying of the hinge plate assembly 3 during operation, providing the equipment with extremely high linear motion accuracy, rigidity and repeatability stability.

[0034] Furthermore, the bottle-dispensing assembly 4 includes: a mounting base 41, a swing arm 42, and a lever 43. The mounting base 41 is fixed on the hinge plate 31. The swing arm 42 is rotatably mounted on the mounting base 41. The lever 43 is engaged at the end of the swing arm 42 away from the hinge plate 31. A third circular guide 44 is rotatably mounted at the end of the swing arm 42 near the hinge plate 31. A tension spring 45 is provided between the swing arm 42 and the mounting base 41. A limit block 46 is provided on the mounting base 41. The third circular guide 44 on the swing arm 42 of the bottle-dispensing assembly 4 located in the initial area 21 is unrestricted. Under the action of the tension spring 45, the swing arm 42 rotates to a vertical position and the lever 43 points downward, and the bottle-dispensing assembly 4 is in a non-dispensing state. State: The third circular guide 44 on the bottle-dispensing assembly 4 in the displacement maintenance zone 22 is gradually restricted, the swing arm 42 drives the lever 43 to gradually rotate upward to the horizontal, and the bottle-dispensing assembly 4 changes from the non-dispensing state to the dispensing state and maintains the dispensing state; The third circular guide 44 on the bottle-dispensing assembly 4 in the bottle-dispensing zone 23 is always restricted, the swing arm 42 and the lever 43 remain horizontally extended, and the bottle-dispensing assembly 4 is in the dispensing state; The third circular guide 44 on the bottle-dispensing assembly 4 in the material-taking zone 24 is gradually unrestricted, and under the action of the tension spring 45, the swing arm 42 drives the lever 43 to gradually rotate to the vertical and the lever 43 is downward, and the bottle-dispensing assembly 4 changes from the dispensing state to the non-dispensing state.

[0035] In this embodiment, the specific connection structure between the swing arm 42 and the mounting base 41 is as follows: a stepped hole 411 is provided in the mounting base 41, and ball bearings 412 are engaged at both ends of the stepped hole 411. A T-shaped shaft 413 is inserted between the two ball bearings 412. The large diameter end of the T-shaped shaft 413 abuts against one ball bearing 412. The swing arm 42 is mounted and fixed on the T-shaped shaft 413 and abuts against the other ball bearing 412. A connecting bolt 414 is coaxially threaded in the T-shaped shaft 413. When the swing arm 42 rotates downward under the tension of the tension spring 45 or rotates upward against the tension of the tension spring 45, the ball bearings 412 enable the swing arm 42 to rotate more flexibly. The specific connection structure between the swing arm 42 and the lever 43 is as follows: an opening groove 421 is provided in the swing arm 42, and arc-shaped grooves are provided on both sides of the opening groove 421. The lever 43 is inserted into the opening groove 421 and aligned with the arc-shaped grooves. A connecting hole is provided on the swing arm 42 that passes through the opening groove 421. A locking bolt 422 is inserted into the connecting hole. The locking bolt 422, together with a nut, tightens the opening groove 421, so that the two arc-shaped grooves fit together on the lever 43 and lock the lever 43 in place. The specific connection structure between the tension spring 45 and the mounting base 41 is as follows: tension spring bolts 451 are threaded onto both the swing arm 42 and the mounting base 41. The two ends of the tension spring 45 are respectively fixed to the two tension spring bolts 451. The limiting block 46 is a stainless steel rubber-coated screw. When the bottle-dispensing assembly 4 is in the non-dispensing state, the swing arm 42 abuts against the limiting block 46 to prevent the swing arm 42 from rotating excessively after being pulled by the tension spring 45. When the stainless steel rubber-coated screw serves as the limiting block 46 to support the swing arm 42, it will not bump or make noise due to the rubber-coated outer shell.

[0036] By restricting the swing arm 42 in different areas on the annular guide rail 2, the lever 43 is forced to switch between a horizontal bottle-dispensing state and a drooping non-bottle-dispensing state. The third circular guide 44 on the swing arm 42 enables the bottle-dispensing assembly 4 to roll against the annular guide rail 2 during movement, reducing friction and improving the movement stability of the bottle-dispensing assembly 4.

[0037] Furthermore, the annular guide rail 2 includes: two parallel straight plates 25, an arc-shaped positioning plate 26, and an arc-shaped adjusting seat 27. The two straight plates 25 are fixed on the bracket 1. One straight plate 25 is adjacent to the guide groove 11, and the other straight plate 25 is away from the guide groove 11. T-shaped straight grooves 251 are provided on the outer side walls of both straight plates 25. An L-shaped limiting plate 252 is provided extending outward from the top wall of the straight plate 25. A straight guide groove 253 is left between the L-shaped limiting plate 252 and the upper outer side wall of the large-diameter section of the T-shaped straight groove 251. Two straight guide grooves are provided at the same hinge point. The first circular guide member 32 rests laterally against the upper and lower outer walls of the large-diameter section of the T-shaped straight groove 251. The upper first circular guide member 32 is rolled and engaged in the straight guide groove 253 and rests against the L-shaped limiting plate 252. The second circular guide member 33 is rolled vertically in the small-diameter section of the T-shaped straight groove 251 and rests against the upper and lower walls of the small-diameter section. The two ends of the arc-shaped positioning plate 26 are fixed to two straight plates 25. Through holes are concentrically arranged in the arc-shaped positioning plate 26. The sprocket 5 is located below the arc-shaped positioning plate 26 and is connected to the through holes. The holes are coaxially aligned; the arc-shaped adjusting seat 27 rests horizontally against two straight plates 25. An arc groove 271, laterally aligned with the T-shaped straight groove 251, is provided on the arc-shaped adjusting seat 27. A slide 13 is provided on the bracket 1, connected to the two straight plates 25. The arc-shaped adjusting seat 27 is slidably engaged on the slide 13. An adjusting screw 131 is movably threaded through the slide 13, rotatably engaging with the arc-shaped adjusting seat 27. A buffer spring 132 is fitted onto the adjusting screw 131, and an adjusting nut 1 is threaded onto the adjusting screw 131. 33. The buffer spring 132 abuts against the slide 13 and the adjusting nut 133 respectively. The initial area 21 is located on the arc-shaped adjusting seat 27 and the straight plate 25 away from the guide plate groove 11. The displacement maintaining area 22 is located on the straight plate 25 away from the guide plate groove 11 and the arc-shaped positioning plate 26. A deflecting pressure plate 28 is provided on the straight plate 25 away from the guide plate groove 11 to change the bottle-dispensing assembly from the non-dispensing state to the dispensing state. The arc-shaped positioning plate 26 maintains the bottle-dispensing assembly in the dispensing state. The bottle-dispensing area 23 and the material-taking area 24 are both located on the straight plate 25 adjacent to the guide plate groove 11.

[0038] The L-shaped limiting plate 252 on the straight plate 25, together with the T-shaped straight groove 251, can constrain the inner and outer lateral sides of the first circular guide 32 located above, while the small diameter section of the T-shaped straight groove 251 constrains the longitudinal direction of the second circular guide 33. In this way, the straight plate 25 can constrain the hinge plate assembly 3, so that the hinge plate assembly 3 can only move along the direction of the T-shaped straight groove 251, which improves the rigidity and stability of the hinge plate assembly 3. When the hinge plate assembly 3 is running stably, the bottle pushing assembly 4 will not shake, and can push the bottle preform accurately and stably. By tightening and loosening the adjusting nut 133, the buffer spring 132 is compressed, thereby tensioning or loosening the hinge plate assembly 3. The buffer spring 132 can also absorb the energy of vibration generated during operation, stabilize the arc-shaped adjusting seat 27, and prevent resonance between the hinge plate assembly 3 and the arc-shaped adjusting seat 27 during operation. The arc groove 271 on the arc-shaped adjusting seat 27 can receive and accommodate the second circular guide 33 that comes out of the T-shaped straight groove 251, while the first circular guide 32 abuts against the outer wall of the arc-shaped adjusting seat 27. The hinge plate assembly 3 that moves out of the straight plate 25 can stably pass through the arc-shaped adjusting seat 27 and stably enter the straight plate 25.

[0039] In this embodiment, chamfers are provided at both ends of the small diameter section of the T-shaped straight groove 251 and both ends of the small diameter section of the arc groove 271 to facilitate the transition of the second circular guide 33.

[0040] Furthermore, the deflecting pressure plate 28 extends outward from the straight plate 25. A spiral groove 281 is provided on the deflecting pressure plate 28. The axis of the spiral groove 281 is parallel to the axis of the T-shaped straight groove 251. The phase difference angle between the end and tail of the spiral groove 281 in the axial direction is 90°. The tail is in horizontal contact with the arc-shaped positioning plate 26, and the bottom wall of the tail is flush with the bottom wall of the arc-shaped positioning plate 26. The end is adjacent to the initial area 21. The end of the spiral groove 281 is in contact with the third circular guide member 44 on the vertically positioned swing arm 42. A guide pressure plate 29 is provided on the straight plate 25 located in the bottle-dispensing area 23, capable of receiving the bottle-dispensing assembly 4 and placing it in the bottle-dispensing state. The guide pressure plate 29 extends out of the straight plate 25, and is in horizontal contact with the arc-shaped positioning plate 26. The bottom wall of the guide pressure plate 29 is flush with the bottom wall of the arc-shaped positioning plate 26. The arc-shaped positioning plate 26, the deflecting pressure plate 28, and the guide pressure plate 28 are all in contact with the straight plate 25. The contact portion of the 9-phase plate also extends outward from the straight plate 25; a pressure-raising component 6 is provided on the straight plate 25 located in the material feeding area 24 to control the bottle-dispensing assembly 4 to change from the bottle-dispensing state to the non-bottle-dispensing state. The pressure-raising component 6 includes: a limiting plate 61; a connecting rod 62 rotatably mounted on the straight plate 25 located in the material feeding area 24; a plurality of connecting blocks 63 are spaced apart on the connecting rod 62; the connecting blocks 63 are connected to the limiting plate 61; and a connecting rod is fitted on the connecting rod 62. Arm 64, connecting arm 64 is hinged to pull rod 65. Servo motor 14 is provided on straight plate 25 located in material picking area 24. Crank wheel 141 is provided on the output shaft of servo motor 14. Pull rod 65 is hinged to the eccentric part of crank wheel 141. When limit plate 61 abuts against the corresponding straight plate 25, limit plate 61 abuts horizontally against guide pressure plate 29 and extends out of straight plate 25. The bottom wall of limit plate 61 is flush with the bottom wall of guide pressure plate 29.

[0041] In the initial zone 21, the swing arm 42 of the bottle-dispensing assembly 4 is in a vertical state under the tension of the tension spring 45, with the lever 43 pointing downwards and the third circular guide 44 pointing upwards. When the bottle-dispensing assembly 4 in this state enters the displacement holding zone 22, the third circular guide 44 on the swing arm 42 contacts the spiral groove 281 on the deflection pressure plate 28. As the bottle-dispensing assembly 4 moves in the displacement holding zone 22, the third circular guide 44 moves along the spiral groove 281, guided by the spiral groove 281. Under the action of the spring 45, the swing arm 42 gradually changes from a vertical state to a horizontal state, thus causing the lever 43 to extend horizontally out of the straight plate 25 to form a bottle-dispensing state. Since the arc-shaped positioning plate 26 is coaxially aligned with the sprocket 5, the sprocket 5 can ensure that the third circular guide 44 on the bottle-dispensing assembly 4 is always restricted by the arc-shaped positioning plate 26 when conveying the hinge plate assembly 3 and the bottle-dispensing assembly 4, so that the bottle-dispensing assembly 4 is in the bottle-dispensing state. The bottle-dispensing assembly 4 enters the bottle-dispensing area 23 in the bottle-dispensing state and inserts into the bottle. The preforms in the preform guide groove 11 are then conveyed with variable pitch and enter the bottle-dispensing assembly 4 in the feeding area 24. The swing arm 42, under the restriction of the limiting plate 61, moves the preforms together in a dispensing state. When the number of preforms entering the feeding area 24 reaches a preset number, the servo motor 14 drives the crank 141 to rotate, thereby driving the eccentrically connected pull rod 65 to descend. The descending pull rod 65 drives the connecting rod arm 64 to drive the connecting rod 62 to rotate. The rotating connecting rod 62 is connected to the connecting block 63. As the moving limit plate 61 rises, the bottle-dispensing component 4 in the picking area 24, no longer restrained by the limit plate 61, no longer rests against the preform. The picking mechanism extends into the picking area 24, grabs the preform, removes it, and transports it to the next station. After the preform is removed, the limit plate 61 descends again and rests against the corresponding straight plate 25, not only re-restricting the bottle-dispensing component 4 in the picking area 24 but also restricting subsequent bottle-dispensing components 4 entering from the bottle-dispensing area 23. The reason for re-restricting the bottle-dispensing component 4 in the picking area 24 is that the hinge plate assembly 3 is constantly running. If the limit plate 61 is open for too long, the subsequent bottle-dispensing components 4 entering the picking area 24 from the bottle-dispensing area 23 will not be restrained and will be in a non-dispensing state, no longer pushing the preform. Only by directly resetting the pressure assembly 6 after the preform is removed can this situation be avoided. The lifting stroke of the limit plate 61 can be controlled by using the tie rod 65 and the crank 141 eccentrically hinged, without the need for additional limit components to limit its lifting position.

[0042] In this embodiment, the connection structure between the connecting rod 62 and the straight plate 25 is as follows: a plurality of L-shaped connecting arms 66 are spaced apart on the inner sidewall of the straight plate 25, and bearings are provided in the L-shaped connecting arms 66. The connecting rod 62 passes through the bearings of the L-shaped connecting arms 66 to improve the rotational flexibility of the connecting rod 62.

[0043] Furthermore, the sprocket 5 includes an upper row of wheels 51, a lower row of wheels 52, and a central shaft 53. The upper row of wheels 51 and the lower row of wheels 52 are coaxially arranged at the upper and lower ends of the central shaft 53. The central shaft 53 is connected to the output shaft of the variable pitch reduction motor 12. Several arc-shaped grooves 54 are evenly distributed on the circumferential walls of the upper row of wheels 51 and the lower row of wheels 52. The arc-shaped grooves 54 on the upper row of wheels 51 and the lower row of wheels 52 are coaxially aligned. The curvature of the arc-shaped grooves 54 is the same as the curvature of the first circular guide member 32. A wall groove 531 is provided on the circumferential wall of the central shaft 53. The second circular guide member 33 is rolled and locked in the wall groove 531 in a vertical state.

[0044] The first circular guide 32 on the hinge plate assembly 3 is rolled and engaged in the arc-shaped grooves 54 of the upper row wheel 51 and the lower row wheel 52 respectively. Since the curvature of the first circular guide 32 is the same as that of the arc-shaped groove 54, the two can fit together when the first circular guide 32 is engaged in the arc-shaped groove 54, which improves stability. The first circular guide 32 is rotatably connected on the hinge plate assembly 3, so the upper row wheel 51 and the lower row wheel 52 are less likely to cause the hinge plate assembly 3 to jam when pulling the first circular guide 32. The second circular guide 33 is rolled and engaged in the wall groove 531, which can position the hinge plate assembly 3 in the sprocket 5 and prevent the first circular guide 32 from slipping and shifting from the arc-shaped groove 54.

[0045] Furthermore, the connection structure between the hinge plates 31 is as follows: Slots 311 and plugs 312 are respectively provided at both axial ends of the hinge plates 31. Hinge holes are provided on both side walls of the slots 311, and hinge holes are also provided on the plugs 312. The plug 312 on one hinge plate 31 extends into the slot 311 of another hinge plate 31. The hinge holes on the plug 312 are coaxially aligned with the two hinge holes on the slot 311. A hinge shaft 313 is rotatably inserted through the three aligned hinge holes. Both ends of the connecting shaft 313 extend out of the hinge plate 31. A connecting plate 314 is movably fitted at both ends of the hinge shaft 313. A first circular guide 32 is rotatably provided at both ends of the hinge shaft 313. The first circular guide 32 abuts against the connecting plate 314 on the same side. A countersunk hole 315 and two flat screw holes 316 are provided on the hinge plate 31. The connecting shaft 331 passes through the second circular guide 33 and extends into the countersunk hole 315 and is connected by a countersunk bolt. The countersunk bolt is not shown in the figure. The connection structure between the bottle-dispensing assembly 4 and the hinge plate 31 is as follows: Two countersunk through holes 415 are provided on the mounting base 41, and three retaining edges 416 are extended on the wall where the mounting base 41 is connected to the hinge plate 31. The three retaining edges 416 are arranged in a triangular shape. When the mounting base 41 abuts against the hinge plate 31, the two countersunk through holes 415 are aligned with the two flat screw holes 316 respectively and connected by bolts. The three retaining edges 416 are respectively locked on the outer side wall of the hinge plate 31 located on both sides of the plug 312 and the groove wall of the slot 311. A second circular guide 33 is rotatably provided on each hinge plate 31 connected to the bottle-dispensing assembly 4.

[0046] The hinge plate assembly 3 improves overall rigidity through the rotational connection structure between the hinge plates 31, making it less susceptible to stretching and deformation. The mounting base 41, secured to the hinge plate 31 by three triangularly arranged locking edges 416, enhances the connection stability between the mounting base 41 and the hinge plate 31, preventing the bottle-dispensing assembly 4 from wobbling on the hinge plate assembly 3. Because the hinge plate 31 with the second circular guide 33 in the hinge plate assembly 3 has an additional longitudinal constraint with the annular guide rail 2, its stability and rigidity on the annular guide rail 2 are the strongest compared to other hinge plates 31. Placing the bottle-dispensing assembly 4 on the hinge plate 31 with the second circular guide 33 further improves the stability of the bottle-dispensing assembly 4 during operation, preventing wobbling during bottle dispensing.

[0047] In this embodiment, the first circular guide 32, the second circular guide 33, and the third circular guide 44 are all bearings.

[0048] Furthermore, protective covers 7 for the hinge plate assembly 3 and the bottle-feeding assembly 4 are provided on the initial area 21 and displacement maintenance area 22 of the annular guide rail 2. A bottle protection channel 8 for the preforms in the bottle-feeding area 23 and the material-taking area 24 is provided on the bracket 1. The bottle protection channel 8 is vertically aligned with the preform guide groove 11. The bottle protection channel 8 is composed of an inner protective plate 81 and an outer protective plate 82. The inner protective plate 81 is fixedly mounted on the bracket 1, and the outer protective plate 82 is flipped onto the bracket 1. Connecting seats 15 are provided on the bracket 1 located at the intersection of the bottle-feeding area 23 and the displacement maintenance area 22, and on the bracket 1 located at the intersection of the material-taking area 24 and the initial area 21. A locking rod 151 is laterally rotatably mounted in the connecting seat 15, and a handle 1 is fitted on the locking rod 151. 52. A rotating frame 153 is mounted on the connecting seat 15 and rotates up and down. A locking plate 154 is mounted on the rotating frame 153 and a locking groove is mounted on the locking plate 154 to cooperate with the locking rod 151. The two ends of the inner protective plate 81 are connected to the two connecting seats 15 respectively, and the two ends of the outer protective plate 82 are connected to the rotating frame 153 on the two connecting seats 15 respectively. When the rotating frame 153 rotates upward until the locking plate 154 abuts against the connecting seat 15, the outer protective plate 82 and the inner protective plate 81 are parallel to form a bottle protection channel 8. The locking rod 151 rotates and is inserted into the locking groove of the locking plate 154. The handle 152 abuts against the locking plate 154. The locking rod 151 is locked in the locking groove of the locking plate 154 by the abutting force of the handle 152 against the locking plate 154.

[0049] When the preform moves in the guide groove 11, the bottle protection channel 8, composed of the inner protective plate 81 and the outer protective plate 82, can protect the preform. When the equipment malfunctions and cannot actively push the bottle, the outer protective plate 82 can be manually rotated to open, and then the preform can be manually pushed to clear the preform in the guide groove 11, which is convenient for subsequent maintenance.

[0050] Furthermore, an inner guide plate 16 is provided on the support 1, and an outer guide plate 17 is provided on the two rotating frames 153. The preform guide groove 11 is located between the inner guide plate 16 and the outer guide plate 17. A bottle-separating assembly 9 is provided on the rotating frame 153 located at the intersection of the bottle-dispensing area 23 and the displacement maintaining area 22, which can push the preforms in batches into the section of the preform guide groove 11 corresponding to the bottle-dispensing area 23. The bottle-separating assembly 9 includes: a platform 91, which is fixed on the rotating frame 153 and located above the outer guide plate 17. A preform dispensing motor 92 is provided on the platform 91. A turntable 93 is provided on the output shaft of the preform dispensing motor 92. Several paddles 94 are evenly distributed on the circumferential wall of the turntable 93. The turntable 93 drives the paddles 94 to make a circular motion above the preform guide groove 11. A baffle 161 is provided above the inner guide plate 16.

[0051] When the preform enters the guide groove 11 from the previous station, the preform is piled up at the end of the guide groove 11. The preform-dispensing motor 92 drives the turntable 93 to rotate, which in turn drives the dispensing blade 94 to rotate. When the dispensing blade 94 rotates, it can separate the preforms in the guide groove 11 and push them into the area corresponding to the dispensing area 23. Each dispensing blade 94 can only push one preform into the area. After each preform enters the area, a dispensing component 4 that enters the dispensing area 23 from the displacement holding area 22 will receive the preform and push it to form a set spacing between the preforms, which is convenient for the subsequent material handling mechanism to handle the material.

[0052] In this embodiment, a pressing plate 18 is provided on the support 1. The pressing plate 18 is located above the guide groove 11. An inclined guide plate is provided at the end of the pressing plate 18 near the bottle separating assembly 9, which is bent upward. The inclined guide plate is not shown in the figure.

[0053] Since the preform moves by being held in the guide groove 11 by its neck, and the bottle-pushing assembly 4 pushes the preform by acting on its body, there is sliding friction between the preform and the inner guide plate 16 and the outer guide plate 17. The friction is relatively large. When subjected to the pushing force of the bottle-pushing assembly 4, the preform is prone to tilting due to friction, and the neck of the preform will flip in the guide groove 11. If the tilting amplitude of the preform is too large, it is easy to disengage from the lever 43 in the bottle-pushing assembly 4, making it impossible to change the pitch stably. Now, with the preform pressing plate 18, the neck of the preform can be limited. When the preform tilts, the neck will abut against the preform pressing plate 18 and the tilting amplitude will be limited, thereby preventing the preform from tilting excessively and disengaging from the lever 43, thus achieving stable pitch change. After the preform pressing plate 18 is set, the material picking mechanism extends into the bottle protection channel 8 to clamp and transport the preform. Therefore, the material picking mechanism can only remove the preform laterally from the guide groove 11 when the bottle-pushing assembly 4 is no longer in the bottle-pushing state.

[0054] Furthermore, a hopper 19 is provided on the support 1, located below the intersection of the material collection area 24 and the initial area 21. When the equipment malfunctions, the bottle protection channel 8 is opened, and the operator manually moves the preform in the guide groove 11 toward the hopper 19. When the preform moves out of the guide groove 11, it will fall directly into the hopper 19.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A high-precision, stable pitch mechanism in a blow molding machine, including: The support is characterized by having a guide groove on the support to guide the movement of the preform; An annular guide rail is mounted on a support. The annular guide rail is provided with an initial zone, a displacement maintenance zone, a bottle-pulling zone, and a material-taking zone. The bottle-pulling zone and the material-taking zone are adjacent to and parallel to the preform guide groove. The hinge plate assembly consists of hinge plates that are hinged together end to end. Two first circular guide members are rotatably provided at the hinge joint of every two hinge plates. A second circular guide member is rotatably provided on any hinge plate. The first and second circular guide members are rolled and locked in the annular guide rail. The first and second circular guide members cooperate with the annular guide rail to constrain the longitudinal and lateral swing of the hinge plate assembly. Several bottle-pulling components are fixed on corresponding hinge plates. The spacing between each pair of adjacent bottle-pulling components is the same. The bottle-pulling components move along the annular guide rail under the drive of the hinge plate components. The bottle-pulling components located in the initial zone are in the non-bottle-pulling state. The bottle-pulling components located in the displacement maintenance zone change from the non-bottle-pulling state to the bottle-pulling state. The bottle-pulling components located in the bottle-pulling zone are in the bottle-pulling state and push the bottle preform in the preform guide groove. The bottle-pulling components located in the material-taking zone can switch between the bottle-pulling state and the non-bottle-pulling state and cooperate with the material-taking mechanism to take out the bottle preform. The sprocket is connected to the output shaft of the variable-pitch geared motor fixed on the bracket. It drives the hinge plate assembly to move along the annular guide rail. The sprocket is engaged with the first circular guide and the second circular guide in a rolling engagement.

2. The high-precision stable variable pitch mechanism in the blow molding machine according to claim 1, characterized in that: The bottle-dispensing assembly includes: a mounting base, a swing arm, and a lever. The mounting base is fixed to a hinge plate. The swing arm is rotatably mounted on the mounting base. The lever is engaged at the end of the swing arm away from the hinge plate. A third circular guide is rotatably mounted at the end of the swing arm near the hinge plate. A tension spring is provided between the swing arm and the mounting base. A limit block is provided on the mounting base. In the initial zone, the third circular guide on the swing arm of the bottle-dispensing assembly is unrestricted. Under the action of the tension spring, the swing arm rotates to a vertical position and the lever points downward, placing the bottle-dispensing assembly in a non-dispensing state. In the displacement maintenance zone... As the third circular guide on the bottle-dispensing assembly in the middle is gradually restricted, the swing arm drives the lever to gradually rotate upward to the horizontal, and the bottle-dispensing assembly changes from the non-dispensing state to the dispensing state and maintains the dispensing state; the third circular guide on the bottle-dispensing assembly in the dispensing zone is always restricted, the swing arm and lever remain horizontal, and the bottle-dispensing assembly is in the dispensing state; the third circular guide on the bottle-dispensing assembly in the material-taking zone is gradually unrestricted, and under the action of the tension spring, the swing arm drives the lever to gradually rotate to the vertical and the lever is downward, and the bottle-dispensing assembly changes from the dispensing state to the non-dispensing state.

3. The high-precision stable pitch mechanism in the blow molding machine according to claim 2, characterized in that: The annular guide rail includes: two parallel straight plates, an arc-shaped positioning plate, and an arc-shaped adjusting seat. The two straight plates are fixed on a bracket. One straight plate is adjacent to the guide groove, and the other straight plate is away from the guide groove. T-shaped straight grooves are provided on the outer walls of both straight plates. An L-shaped limiting plate extends outward from the top wall of the straight plate. A straight guide groove is left between the L-shaped limiting plate and the upper outer wall of the large-diameter section of the T-shaped straight groove. Two first circular guide members at the same hinge point abut against the upper and lower outer walls of the large-diameter section of the T-shaped straight groove in a transverse state. The upper first circular guide member is rolled and locked in the straight guide groove and abuts against the L-shaped limiting plate. The second circular guide member is rolled and locked in the small-diameter section of the T-shaped straight groove in a vertical state and abuts against the upper and lower walls of the small-diameter section. The two ends of the arc-shaped positioning plate are fixed to the two straight plates. Through holes are concentrically provided in the arc-shaped positioning plate. The sprocket is located in the arc-shaped positioning plate. The plate is located below and coaxially aligned with the through hole; the arc-shaped adjustment seat rests horizontally against two straight plates. An arc groove aligned laterally with the T-shaped straight groove is provided on the arc-shaped adjustment seat. A slide is provided on the support and connected to the two straight plates. The arc-shaped adjustment seat is slidably locked on the slide. An adjustment screw is movably inserted through the slide and is rotatably locked with the arc-shaped adjustment seat. A buffer spring is fitted on the adjustment screw and an adjustment nut is threaded onto the adjustment screw. The buffer spring rests against the slide and the adjustment nut respectively. The initial zone is located on the arc-shaped adjustment seat and the straight plate away from the guide plate groove. The displacement maintenance zone is located on the straight plate away from the guide plate groove and the arc-shaped positioning plate. A deflecting pressure plate is provided on the straight plate away from the guide plate groove to change the bottle-dispensing assembly from the non-dispensing state to the dispensing state. The arc-shaped positioning plate maintains the bottle-dispensing assembly in the dispensing state. The bottle-dispensing area and the material-taking area are both located on the straight plate adjacent to the guide plate groove.

4. The high-precision stable pitch mechanism in the blow molding machine according to claim 3, characterized in that: A spiral groove is provided on the deflecting pressure plate. The phase difference angle between the end and tail of the spiral groove in the axial direction is 90°. The tail is in horizontal contact with the arc-shaped positioning plate, and the bottom wall of the tail is flush with the bottom wall of the arc-shaped positioning plate. The end is adjacent to the initial area. The end of the spiral groove is in contact with the third circular guide on the vertical swing arm. A guide pressure plate is provided on the straight plate located in the bottle-dispensing area to receive the bottle-dispensing assembly and put it in the bottle-dispensing state. The guide pressure plate is in horizontal contact with the arc-shaped positioning plate, and the bottom wall of the guide pressure plate is flush with the bottom wall of the arc-shaped positioning plate. The part of the arc-shaped positioning plate that contacts the deflecting pressure plate and the guide pressure plate also extends outward from the straight plate. A pressure-inducing component is installed on the straight plate in the material picking area to control the bottle-dispensing assembly to change from the bottle-dispensing state to the non-bottle-dispensing state. The pressure-inducing component includes: a limiting plate; a connecting rod rotatably mounted on the straight plate in the material picking area; several connecting blocks spaced apart on the connecting rod and connected to the limiting plate; a connecting arm mounted on the connecting rod and hinged to a pull rod; a servo motor mounted on the straight plate in the material picking area; a crank wheel mounted on the output shaft of the servo motor; and a pull rod hinged to the eccentric part of the crank wheel. When the limiting plate abuts against the corresponding straight plate, the limiting plate abuts horizontally against the guide pressure plate and extends out of the straight plate, with the bottom wall of the limiting plate flush with the bottom wall of the guide pressure plate.

5. The high-precision stable pitch mechanism in the blow molding machine according to claim 3, characterized in that: A through hole is concentrically arranged in the arc-shaped positioning plate. The sprocket is located below the arc-shaped positioning plate and is coaxially aligned with the through hole. The sprocket includes an upper row of wheels, a lower row of wheels, and a central shaft. The upper and lower rows of wheels are coaxially arranged at the upper and lower ends of the central shaft. The central shaft is connected to the output shaft of the variable-pitch reduction motor. Several arc-shaped slots are evenly distributed on the circumferential walls of the upper and lower rows of wheels. The arc-shaped slots on the upper and lower rows of wheels are coaxially aligned one by one. The curvature of the arc-shaped slots is the same as the curvature of the first circular guide. A wall groove is provided on the circumferential wall of the central shaft. The second circular guide is rolled and locked in the wall groove in a vertical state.

6. The high-precision stable pitch mechanism in the blow molding machine according to claim 2, characterized in that: The connection structure between the hinge plates is as follows: each of the two axial ends of the hinge plate is provided with a slot and a plug. The two side walls of the slot are provided with hinge holes, and the plug is also provided with hinge holes. The plug on one hinge plate extends into the slot of another hinge plate. The hinge holes on the plug are coaxially aligned with the two hinge holes on the slot. A hinge shaft is rotatably inserted through the three relatively aligned hinge holes. Both ends of the hinge shaft extend out of the hinge plate. A connecting plate is movably fitted at both ends of the hinge shaft. A first circular guide is rotatably provided at both ends of the hinge shaft. The first circular guide abuts against the connecting plate on the same side. A countersunk hole and two flat screw holes are provided on the hinge plate. The connecting shaft passes through the second circular guide and extends into the countersunk hole and is connected by a countersunk bolt. The connection structure between the bottle-dispensing assembly and the hinge plate is as follows: Two countersunk through holes are provided on the mounting base, and three retaining edges are extended on the wall connecting the mounting base and the hinge plate. The three retaining edges are arranged in a triangular pattern. When the mounting base abuts against the hinge plate, the two countersunk through holes are aligned with the two flat screw holes and connected by bolts. The three retaining edges are respectively secured on the outer walls of the hinge plate on both sides of the plug and on the groove wall of the slot. Each hinge plate connected to the bottle-dispensing assembly is rotatably provided with a second circular guide.

7. The high-precision stable pitch mechanism in the blow molding machine according to any one of claims 1 to 6, characterized in that: Protective covers for the hinge plate assembly and bottle-feeding assembly are installed in the initial and displacement-maintaining areas of the annular guide rail. A bottle-protecting channel for preforms in the bottle-feeding and feeding areas is installed on the support. The bottle-protecting channel is vertically aligned with the preform guide groove and is composed of an inner and outer protective plate. The inner protective plate is fixedly mounted on the support, while the outer protective plate is flipped onto the support. Connecting seats are installed on the support at the intersection of the bottle-feeding and displacement-maintaining areas and at the intersection of the feeding and initial areas. A locking rod is installed in the middle for horizontal rotation, and a handle is fitted on the locking rod. A rotating frame is installed on the connecting seat for vertical rotation, and a locking plate is installed on the rotating frame. The locking plate has a locking groove that cooperates with the locking rod. The two ends of the inner protective plate are connected to the two connecting seats respectively, and the two ends of the outer protective plate are connected to the rotating frames on the two connecting seats respectively. When the rotating frame rotates upward until the locking plate abuts against the connecting seat, the outer protective plate and the inner protective plate are parallel to form a bottle protection channel, the locking rod is inserted into the locking groove of the locking plate, and the handle abuts against the locking plate.

8. The high-precision stable pitch mechanism in the blow molding machine according to claim 7, characterized in that: An inner guide plate is provided on the support, and outer guide plates are provided on the two rotating frames. The preform guide groove is located between the inner guide plate and the outer guide plate. A bottle-separating assembly is provided on the rotating frame located at the intersection of the bottle-dispensing area and the displacement maintenance area, which can push the preforms in batches into the section corresponding to the bottle-dispensing area in the preform guide groove. The bottle-separating assembly includes: a platform, which is fixed on the rotating frame and located above the outer guide plate. A preform dispensing motor is provided on the platform. A turntable is provided on the output shaft of the preform dispensing motor. Several dispensing blades are evenly distributed on the circumferential wall of the turntable. The turntable drives the dispensing blades to make a circular motion above the preform guide groove. A baffle is provided above the inner guide plate.

9. The high-precision stable pitch mechanism in the blow molding machine according to claim 8, characterized in that: A pressing plate is installed on the support, which is located above the guide groove. An inclined guide plate is installed at the end of the pressing plate that is close to the bottle separating assembly.

10. The high-precision stable pitch mechanism in the blow molding machine according to any one of claims 1 to 6, characterized in that: A hopper is installed on the support frame, located below the intersection of the material collection area and the initial area.

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