Automatic positioning device of fracture threaded bottle preform for bottle blowing machine

Abstract

The invention provides an automatic positioning device of a fracture threaded bottle preform for a bottle blowing machine. The automatic positioning device comprises a positioning base, a positioning supporting plate is slidably arranged at the upper end of the positioning base. A longitudinal driving mechanism is arranged on the outer side of the upper end of the positioning base. A positioning fork plate is slidably arranged at the upper end of the positioning supporting plate, and a transverse driving mechanism is arranged on the front side of the positioning supporting plate. At least one group of positioning components are arranged at the upper end of the positioning fork plate; the positioning assembly comprises a positioning bottom plate, a positioning support fixedly arranged at the upper end of the positioning bottom plate and a positioning piece rotationally arranged on the positioning support, an elastic mechanism is arranged at the upper end of the positioning bottom plate, the elastic mechanism is connected with the lower end of the positioning piece, and when the fracture of the bottle preform is positioned through the positioning piece, the upper end of the positioning piece is large in length; in this way, the situation that the bottle preform is jacked up in the positioning process is not likely to occur, and blowing of the bottle preform is not likely to be affected.

Description

Technical Field

[0001] The invention relates to components of a bottle blowing machine, in particular to an automatic positioning device for a broken thread bottle embryo for the bottle blowing machine. Background Art

[0002] At present, the Chinese patent with the announcement number CN111823538A discloses a servo automatic bottle blowing machine, which includes a frame, a preform shifting and conveying mechanism, a heating mechanism, a bottle blowing mechanism and a material taking mechanism. The preform mold is driven by the preform shifting and conveying mechanism to sequentially enter the heating mechanism and the bottle blowing mechanism, and finally the standard product is taken out by the material taking mechanism. The preform shifting and conveying mechanism includes a main chain, a shifting mechanism of the main chain and a preform mold self-rotating mechanism. The preform mold self-rotating mechanism is used to drive the preform to rotate circumferentially when the preform enters the heating mechanism, so that the preform is heated evenly.

[0003] At present, a Chinese patent with the publication number CN106313487A discloses an automatic positioning device for a preform, which includes a bracket and a positioning ejector pin fixedly arranged on the bracket.

[0004] However, when the above-mentioned bottle preform automatic positioning device is installed on the above-mentioned servo automatic bottle blowing machine to position the bottle preform with a broken thread on the outside of the bottle mouth during the blow molding process, if the broken edge at the bottle preform mouth is not directly aligned with the positioning ejector pin, the tip of the positioning ejector pin will enter the spiral groove and push the bottle preform upward during the rotation of the bottle preform, affecting the blowing of the bottle preform. Summary of the invention

[0005] In view of this, an object of the present invention is to provide an automatic positioning device for a broken threaded bottle preform for a bottle blowing machine, which has the advantages of not easily lifting the bottle preform during the positioning process and not easily affecting the blowing of the bottle preform.

[0006] In order to solve the above technical problems, the technical solution of the present invention is: an automatic positioning device for a broken thread bottle preform for a bottle blowing machine, comprising a positioning base; A positioning support plate is slidably provided on the upper end of the positioning base, the sliding direction of the positioning support plate is perpendicular to the conveying direction of the bottle preform, a longitudinal driving mechanism is provided on the outer side of the upper end of the positioning base, and the output end of the longitudinal driving mechanism is connected to the positioning support plate to drive the positioning support plate to move back and forth; A positioning fork plate is slidably provided at the upper end of the positioning support plate, the sliding direction of the positioning fork plate is parallel to the conveying direction of the bottle preform, and a transverse driving mechanism is provided at the front side of the positioning support plate, and the output end of the transverse driving mechanism is connected to the positioning fork plate to drive the positioning fork plate to move back and forth; At least one group of positioning components is disposed at the upper end of the positioning fork plate, and when the number of the positioning components is greater than or equal to two, the positioning components are evenly spaced along the conveying direction of the preform; The positioning assembly includes a positioning base plate, a positioning bracket fixedly arranged at the upper end of the positioning base plate, and a positioning piece rotatably arranged on the positioning bracket, wherein the rotation axis of the positioning piece is arranged along the conveying direction of the bottle embryo, the upper end of the positioning piece is bent toward the side of the bottle embryo seat, and the upper end of the positioning base plate is provided with an elastic mechanism, and the elastic mechanism is connected to the lower end of the positioning piece to drive the lower end of the positioning piece to rotate toward the side of the bottle embryo seat.

[0007] According to the above technical solution, when in use, the preform seat with the preform sleeved on the upper end is driven by the preform shifting and conveying mechanism on the bottle blowing machine to rotate along its own circumference and move along the track. When the preform seat moves to face the positioning piece, the movement of the preform seat along the track is suspended by the preform shifting and conveying mechanism. Then, the positioning base is driven to move to one side of the preform seat by the longitudinal driving mechanism, so that the positioning piece contacts the bottle mouth of the preform. If the fracture at the bottle mouth is just facing the positioning piece at this time, the upper end of the positioning piece will be directly inserted into the fracture under the action of the elastic mechanism to position the preform. If the fracture at the bottle mouth is not facing the positioning piece at this time, the upper end of the positioning piece will rotate upward under the action of the bottle mouth, and the elastic mechanism will accumulate elastic force. Then, the preform seat will drive the preform to rotate circumferentially under the action of the preform shifting and conveying mechanism until the fracture of the preform is turned to face the positioning piece, and the elastic mechanism will drive the positioning piece to rotate downward around the rotation axis, so that the upper end of the positioning piece is inserted into the fracture to position the preform. Finally, the transverse driving mechanism will drive the positioning tray to move along the conveying direction of the bottle preform, and send the bottle preform into the blow molding mold of the bottle blowing machine for blowing.

[0008] When the fracture of the preform is positioned by the positioning piece, the upper end of the positioning piece will not be stuck in the spiral groove due to its large length, so that the preform is not likely to be lifted up during the positioning process, and the blowing of the preform is not likely to be affected.

[0009] Preferably, the longitudinal drive mechanism includes a mounting plate and a longitudinal drive cylinder, the mounting plate is vertically arranged on the upper end of the positioning base, the cylinder body of the longitudinal drive cylinder is fixedly arranged on the outer side of the mounting plate, and the piston rod of the longitudinal drive cylinder passes through the mounting plate and is connected to the positioning support plate.

[0010] Through the above technical solution, the piston rod of the longitudinal drive cylinder will drive the positioning base to move during the activity. A mounting plate is arranged on the upper end of the positioning base to fix the cylinder body of the longitudinal drive cylinder, making the disassembly and assembly of the longitudinal drive cylinder more convenient.

[0011] Preferably, the lateral drive mechanism includes a servo motor fixedly arranged on the outside of the positioning support plate, a driving gear fixedly arranged on the output end of the servo motor, and a driven rack fixedly arranged on the front side of the positioning fork plate, and the driving gear is meshed with the driven rack.

[0012] Through the above technical solution, the servo motor will drive the driving gear to rotate circumferentially when it is running, and the driven rack will drive the positioning support plate to move during the rotation of the driving gear. The cooperation of the servo motor, the driving gear and the driven rack makes the movement of the positioning support plate more precise.

[0013] Preferably, an arc-shaped positioning notch for the preform seat to be inserted into is provided on the inner side of the positioning fork plate from top to bottom, and the center of the arc-shaped positioning notch is directly opposite to the positioning piece.

[0014] By means of the above technical solution, when the preform seat enters the arc-shaped positioning notch, the inner wall of the arc-shaped positioning notch will collide with the outer peripheral wall of the preform seat to limit the movement of the preform seat.

[0015] Preferably, the elastic mechanism includes a connecting plate arranged at the upper end of the positioning base plate, a response plate arranged at the lower end of the positioning piece, and a spring arranged between the connecting plate and the response plate.

[0016] Through the above technical solution, the elastic force generated by the deformation of the spring will be transmitted to the positioning piece through the response plate, so that the positioning piece rotates around the rotation axis to one side of the bottle embryo seat.

[0017] Preferably, the elastic mechanism also includes a guide column fixedly arranged on the inner side of the lower end of the connecting plate, the spring is sleeved on the outer side of the guide column, the response plate is penetrated by a movable hole, the length of the movable hole is greater than the diameter of the guide column, and the guide column is slidably inserted into the movable hole.

[0018] Through the above technical solution, the guide column can not only be used to guide the expansion and contraction of the spring, but also cooperate with the movable hole to limit the rotation stroke of the positioning piece.

[0019] Preferably, the connecting plate is provided with an adjustment through hole from top to bottom, the upper end of the positioning base plate is fixedly connected with an adjustment bolt, the adjustment bolt passes through the adjustment through hole, two adjustment nuts are threadedly connected on the adjustment bolt, and the two adjustment nuts are respectively tightened against the upper and lower ends of the connecting plate.

[0020] Through the above technical solution, the height of the connecting plate can be changed by changing the positions of the two adjusting nuts during use, thereby changing the elastic force that the spring can provide.

[0021] Preferably, there are two groups of positioning brackets, and the two groups of positioning brackets are distributed along the transportation direction of the preform, and the positioning piece is rotatably connected between the two positioning brackets.

[0022] Through the above technical solution, the positioning piece is rotatably connected between the two positioning brackets, and the connection is more stable.

[0023] Preferably, a connecting shaft is provided through the two positioning brackets, and the two connecting shafts are respectively in conflict with the front and rear sides of the positioning piece, the cross-section of the connecting shaft is T-shaped, and the large ends of the two connecting shafts are respectively located at opposite sides of the two positioning brackets, a threaded column is provided at the rear end of the front connecting shaft, and the positioning piece is provided with a mounting through hole from front to back, the threaded column passes through the mounting through hole, and a threaded sleeve is provided at the front side section of the rear connecting shaft, the threaded sleeve is threadedly connected to the outside of the threaded column, and the outer wall of the threaded sleeve is in conflict with the inner hole wall of the mounting through hole.

[0024] Through the above technical solution, the threaded column and the threaded sleeve cooperate with each other to connect the two connecting shafts with the positioning piece, making the disassembly and assembly of the positioning piece more convenient.

[0025] Preferably, the outer sides of the two connecting shafts are both sleeved with wear-resistant sleeves, and the two ends of the wear-resistant sleeves are respectively in conflict with the positioning bracket and the positioning sheet.

[0026] Through the above technical solution, the wear-resistant sleeve can not only be used to support the positioning piece so that the positioning piece is not easily offset during rotation, but also can be used to position the positioning piece so that the installation of the positioning piece is more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of embodiment 1; Figure 2 for Figure 1 A magnified view of part A; Figure 3 It is a partial schematic diagram of the first embodiment; Figure 4 for Figure 3 A magnified view of part B; Figure 5 is a schematic diagram of a positioning component in Embodiment 1; Figure 6 A partial schematic diagram of Example 2; Figure 7 for Figure 6 Enlarged view of part C; Figure 8 for Figure 6 Enlarged view of part D.

[0028] Figure numerals: 1, positioning base; 2, positioning support plate; 3, longitudinal drive mechanism; 31, mounting plate; 32, longitudinal drive cylinder; 4, positioning fork plate; 5, transverse drive mechanism; 51, servo motor; 52, driving gear; 53, driven rack; 6, positioning assembly; 61, positioning base plate; 62, positioning bracket; 63, positioning sheet; 7, elastic mechanism; 71, connecting plate; 72, response plate; 73, spring; 74, guide column; 8, arc-shaped positioning notch; 9, movable hole; 10, adjustment through hole; 11, adjustment 1. Joint bolt; 12. Adjusting nut; 13. Connecting shaft; 14. Threaded column; 15. Mounting through hole; 16. Threaded sleeve; 17. Wear-resistant sleeve; 18. Air blowing auxiliary component; 181. Fixed bracket; 182. Air blowing nozzle; 183. Rotary drive mechanism; 1831. Transmission gear; 1832. Extension bracket; 1833. Extension shaft; 1834. Active transmission wheel; 1835. Driven gear; 1836. Driven pulley; 1837. Conveyor belt; 19. Keyway; 20. Key; 21. Connecting opening. Implementation

[0029] The specific implementation modes of the present invention are further described below in conjunction with the accompanying drawings to make the technical solutions of the present invention easier to understand and grasp. Embodiment 1

[0030] An automatic positioning device for a broken thread bottle preform for a bottle blowing machine, such as Figures 1 to 5 As shown, it includes a positioning base 1.

[0031] A positioning support plate 2 is slidably disposed on the upper end of the positioning base 1, and the sliding direction of the positioning support plate 2 is perpendicular to the conveying direction of the preform. A longitudinal driving mechanism 3 is disposed on the outer side of the upper end of the positioning base 1, and the output end of the longitudinal driving mechanism 3 is connected to the positioning support plate 2 to drive the positioning support plate 2 to move back and forth.

[0032] A positioning fork plate 4 is slidably provided at the upper end of the positioning pallet 2, and the sliding direction of the positioning fork plate 4 is parallel to the conveying direction of the bottle embryo. A transverse driving mechanism 5 is provided on the front side of the positioning pallet 2, and the output end of the transverse driving mechanism 5 is connected to the positioning fork plate 4 to drive the positioning fork plate 4 to move back and forth.

[0033] At least one group of positioning components 6 is disposed at the upper end of the positioning fork plate 4, and when the number of positioning components 6 is greater than or equal to two, the positioning components 6 are evenly spaced along the conveying direction of the preform. In this embodiment, there are two groups of positioning components 6.

[0034] The positioning assembly 6 includes a positioning base plate 61, a positioning bracket 62 fixedly arranged at the upper end of the positioning base plate 61, and a positioning piece 63 rotatably arranged on the positioning bracket 62. The rotation axis of the positioning piece 63 is arranged along the conveying direction of the bottle preform. The upper end of the positioning piece 63 is bent toward the bottle preform seat. The upper end of the positioning base plate 61 is provided with an elastic mechanism 7, which is connected to the lower end of the positioning piece 63 to drive the lower end of the positioning piece 63 to rotate toward the bottle preform seat.

[0035] The longitudinal driving mechanism 3 includes a mounting plate 31 and a longitudinal driving cylinder 32. The mounting plate 31 is vertically arranged on the upper end of the positioning base 1. The cylinder body of the longitudinal driving cylinder 32 is fixedly arranged on the outer side of the mounting plate 31. The piston rod of the longitudinal driving cylinder 32 passes through the mounting plate 31 and is connected to the positioning support plate 2.

[0036] The transverse driving mechanism 5 includes a servo motor 51 fixedly arranged on the outside of the positioning support plate 2, a driving gear 52 fixedly arranged on the output end of the servo motor 51, and a driven rack 53 fixedly arranged on the front side of the positioning fork plate 4, and the driving gear 52 is meshed with the driven rack 53.

[0037] An arc-shaped positioning notch 8 for the preform seat to be inserted into is provided on the inner side of the positioning fork plate 4 from top to bottom, and the center of the arc-shaped positioning notch 8 is directly opposite to the positioning piece 63 .

[0038] The elastic mechanism 7 includes a connecting plate 71 arranged at the upper end of the positioning base plate 61, a response plate 72 arranged at the lower end of the positioning plate 63, and a spring 73 arranged between the connecting plate 71 and the response plate 72. The elastic mechanism 7 also includes a guide column 74 fixedly arranged on the inner side of the lower end of the connecting plate 71, the spring 73 is sleeved on the outer side of the guide column 74, the response plate 72 is penetrated by a movable hole 9, the length of the movable hole 9 is greater than the diameter of the guide column 74, and the guide column 74 is slidably penetrated in the movable hole 9. The connecting plate 71 is penetrated by an adjustment through hole 10 from top to bottom, the upper end of the positioning base plate 61 is fixedly connected with an adjustment bolt 11, the adjustment bolt 11 passes through the adjustment through hole 10, and two adjustment nuts 12 are threadedly connected to the adjustment bolt 11, and the two adjustment nuts 12 are respectively pressed against the upper and lower ends of the connecting plate 71.

[0039] In this embodiment, there are two groups of positioning brackets 62, and the two groups of positioning brackets 62 are distributed along the transportation direction of the preform, and the positioning piece 63 is rotatably connected between the two positioning brackets 62. The two positioning brackets 62 are both provided with a connecting shaft 13, and the two connecting shafts 13 are respectively in conflict with the front and rear sides of the positioning piece 63, the cross section of the connecting shaft 13 is T-shaped, and the large ends of the two connecting shafts 13 are respectively located at the opposite sides of the two positioning brackets 62, and the rear side end of the front connecting shaft 13 is provided with a threaded column 14, and the positioning piece 63 is provided with a mounting through hole 15 from front to back, and the threaded column 14 passes through the mounting through hole 15, and the front side section of the rear connecting shaft 13 is provided with a threaded sleeve 16, and the threaded sleeve 16 is threadedly connected to the outside of the threaded column 14, and the outer wall of the threaded sleeve 16 is in conflict with the inner hole wall of the mounting through hole 15. The outer sides of the two connecting shafts 13 are both sleeved with wear-resistant sleeves 17 , and the two ends of the wear-resistant sleeves 17 are respectively in contact with the positioning bracket 62 and the positioning sheet 63 . Embodiment 2

[0040] The difference between the second embodiment and the first embodiment is that Figures 6 to 8 As shown, both the front and rear sides of the positioning piece 63 are provided with air blowing auxiliary components 18, which are used to continuously apply downward force to the upper end of the outer flange of the bottle mouth by blowing air during the movement of the positioning piece 63, so as to ensure that the preform is not easy to jump during the subsequent movement. Moreover, the air blown out from the two air blowing auxiliary components 18 contacts the front and rear sides of the outer flange of the bottle mouth respectively, so as to ensure that the force applied from the front and rear sides will not cause the preform to tilt during the subsequent movement.

[0041] The air blowing auxiliary device includes a fixed bracket 181 arranged at the side wall of the positioning plate 63, an air blowing nozzle 182 rotatably connected to the fixed bracket 181, and a rotating driving mechanism 183 for driving the air blowing nozzle 182 to rotate. The inner end of the air blowing nozzle 182 is an air outlet, and the air outlet is arranged in a constricted shape. The outer end of the air blowing nozzle 182 is an air inlet, and the air inlet is connected to an external air source through a hose. In this embodiment, the external air source is an air outlet pump.

[0042] A keyway 19 is provided in the inner wall of the mounting through hole 15 in the axial direction. A convex key 20 is provided in the outer wall of the threaded sleeve 16 in the axial direction, and the convex key 20 is fixedly mounted in the inner side of the keyway 19. When the positioning piece 63 rotates under the action of the elastic mechanism 7, the positioning piece 63 can drive the connecting shaft 13 to rotate synchronously through the convex key 20.

[0043] A connecting opening 21 is provided at the side wall of the wear-resistant sleeve 17, and the central angle of the connecting opening 21 is greater than 180 degrees. The rotary drive mechanism 183 includes a plurality of transmission teeth 1831 fixedly arranged at the outer wall of the connecting shaft 13 along the circumferential direction, the distribution angle of the plurality of transmission teeth 1831 is greater than one-half of the central angle of the connecting opening 21, and the distribution angle of the plurality of transmission teeth 1831 is less than the central angle of the connecting opening 21. The rotary drive mechanism 183 also includes an extension bracket 1832 fixedly connected to the upper end of the positioning bracket 62, the end of the extension bracket 1832 close to the positioning sheet 63 is rotatably connected to the extension shaft 1833, and the extension shaft 1833 is key-connected with a driving transmission wheel 1834 and a driven gear 1835 in sequence from the side away from the positioning sheet 63 to the side close to the positioning sheet 63, wherein the outer diameter of the driving transmission wheel 1834 is smaller than the tooth top circle diameter of the driven gear 1835, and the driven gear 1835 is meshed with the transmission teeth 1831. A driven pulley 1836 is disposed on the side of the air blowing nozzle 182 away from the fixed bracket 181 , and a conveyor belt 1837 is tensioned between the driven pulley 1836 and the driving pulley.

[0044] When the positioning plate 63 rotates around the rotation axis, the positioning plate 63 will drive the connecting shaft 13 to rotate circumferentially, and the connecting shaft 13 will drive the driven gear 1835 to rotate circumferentially through a plurality of transmission teeth 1831. The driven gear 1835 will drive the active transmission wheel 1834 to rotate circumferentially through the extended shaft 1833. The active transmission wheel 1834 will drive the blowing nozzle 182 to rotate circumferentially through the driven pulley 1836 to adjust the direction of the blowing nozzle 182.

[0045] Of course, the above are only typical examples of the present invention. In addition, the present invention may also have many other specific implementations. All technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the present invention.

Claims

1. An automatic positioning device for a broken thread bottle preform for a bottle blowing machine, characterized by: It comprises a positioning base (1); A positioning support plate (2) is slidably disposed on the upper end of the positioning base (1), the sliding direction of the positioning support plate (2) being perpendicular to the conveying direction of the preform, a longitudinal driving mechanism (3) is disposed on the outer side of the upper end of the positioning base (1), the output end of the longitudinal driving mechanism (3) being connected to the positioning support plate (2) for driving the positioning support plate (2) to move back and forth; A positioning fork plate (4) is slidably provided at the upper end of the positioning support plate (2), the sliding direction of the positioning fork plate (4) is parallel to the conveying direction of the bottle preform, and a transverse driving mechanism (5) is provided on the front side of the positioning support plate (2), the output end of the transverse driving mechanism (5) is connected to the positioning fork plate (4) to drive the positioning fork plate (4) to move back and forth; At least one group of positioning components (6) is arranged at the upper end of the positioning fork plate (4), and when the number of the positioning components (6) is greater than or equal to two, the positioning components (6) are distributed at equal intervals along the conveying direction of the preform; The positioning assembly (6) comprises a positioning base plate (61), a positioning bracket (62) fixedly arranged at the upper end of the positioning base plate (61), and a positioning piece (63) rotatably arranged on the positioning bracket (62); the rotation axis of the positioning piece (63) is arranged along the conveying direction of the bottle preform; the upper end of the positioning piece (63) is bent toward one side of the bottle preform seat; the upper end of the positioning base plate (61) is provided with an elastic mechanism (7); the elastic mechanism (7) is connected to the lower end of the positioning piece (63) and is used for driving the lower end of the positioning piece (63) to rotate toward the side of the bottle preform seat.

2. The automatic positioning device for a broken thread preform for a bottle blowing machine according to claim 1, characterized in that: The longitudinal drive mechanism (3) comprises a mounting plate (31) and a longitudinal drive cylinder (32); the mounting plate (31) is vertically arranged on the upper end of the positioning base (1); the cylinder body of the longitudinal drive cylinder (32) is fixedly arranged on the outer side of the mounting plate (31); and the piston rod of the longitudinal drive cylinder (32) passes through the mounting plate (31) and is connected to the positioning support plate (2).

3. The automatic positioning device for a broken thread preform for a bottle blowing machine according to claim 1, characterized in that: The transverse driving mechanism (5) comprises a servo motor (51) fixedly arranged on the outside of the positioning support plate (2), a driving gear (52) fixedly arranged at the output end of the servo motor (51), and a driven rack (53) fixedly arranged on the front side of the positioning fork plate (4), wherein the driving gear (52) meshes with the driven rack (53).

4. The automatic positioning device for a broken thread preform for a bottle blowing machine according to claim 1, characterized in that: An arc-shaped positioning notch (8) is provided on the inner side of the positioning fork plate (4) from top to bottom, into which the bottle embryo seat is inserted, and the center of the arc-shaped positioning notch (8) is directly opposite to the positioning piece (63).

5. The automatic positioning device for a broken thread preform for a bottle blowing machine according to claim 1, characterized in that: The elastic mechanism (7) comprises a connecting plate (71) arranged at the upper end of the positioning base plate (61), a response plate (72) arranged at the lower end of the positioning plate (63), and a spring (73) arranged between the connecting plate (71) and the response plate (72).

6. The automatic positioning device for a broken thread preform for a bottle blowing machine according to claim 5, characterized in that: The elastic mechanism (7) further comprises a guide column (74) fixedly arranged on the inner side of the lower end of the connecting plate (71); the spring (73) is sleeved on the outer side of the guide column (74); the response plate (72) is provided with a movable hole (9) penetrating therethrough; the length of the movable hole (9) is greater than the diameter of the guide column (74); and the guide column (74) is slidably arranged in the movable hole (9).

7. The automatic positioning device for a broken thread preform for a bottle blowing machine according to claim 6, characterized in that: The connecting plate (71) is provided with an adjustment through hole (10) from top to bottom, and the upper end of the positioning base plate (61) is fixedly connected with an adjustment bolt (11), the adjustment bolt (11) passes through the adjustment through hole (10), and two adjustment nuts (12) are threadedly connected to the adjustment bolt (11), and the two adjustment nuts (12) are respectively tightly pressed against the upper and lower ends of the connecting plate (71).

8. The automatic positioning device for a broken thread preform for a bottle blowing machine according to claim 1, characterized in that: There are two groups of positioning brackets (62), and the two groups of positioning brackets (62) are distributed along the transportation direction of the bottle embryo, and the positioning piece (63) is rotatably connected between the two positioning brackets (62).

9. The automatic positioning device for a broken thread preform for a bottle blowing machine according to claim 8, characterized in that: A connecting shaft (13) is provided through the two positioning brackets (62), and the two connecting shafts (13) are respectively in conflict with the front and rear sides of the positioning piece (63). The cross section of the connecting shaft (13) is T-shaped, and the large ends of the two connecting shafts (13) are respectively located at the opposite sides of the two positioning brackets (62). A threaded column (14) is provided at the rear end of the front connecting shaft (13). A mounting through hole (15) is provided through the positioning piece (63) from front to back, and the threaded column (14) passes through the mounting through hole (15). A threaded sleeve (16) is provided at the front section of the rear connecting shaft (13). The threaded sleeve (16) is threadedly connected to the outer side of the threaded column (14), and the outer wall of the threaded sleeve (16) is in conflict with the inner hole wall of the mounting through hole (15).

10. The automatic positioning device for a broken thread preform for a bottle blowing machine according to claim 9, characterized in that: The outer sides of the two connecting shafts (13) are both sleeved with wear-resistant sleeves (17), and the two ends of the wear-resistant sleeves (17) are respectively in conflict with the positioning bracket (62) and the positioning sheet (63).

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