Bottle preform removing device and bottle preform detecting and screening system

Abstract

The invention belongs to the technical field of plastic bottle processing equipment, and discloses a bottle preform removing device and a bottle preform detecting and screening system. The bottle preform removing device comprises a conveying mechanism and a removing mechanism, the conveying mechanism comprises a conveying chain, the conveying chain is used for conveying and conveying bottle preforms, a notch is formed in the conveying chain, and an auxiliary part is telescopically connected to the notch so as to fill the complete conveying chain or open the notch to form a removing opening; the removing mechanism comprises a plurality of first blowing parts and a plurality of second blowing parts, the first blowing parts and the second blowing parts are both connected with an air supply device, and the first blowing parts are arranged at the tops of the notches; the first blowing part is arranged on one side of the bottom of the notch, the second blowing part is arranged on one side of the bottom of the notch, the blowing directions of the first blowing part and the second blowing part are different, defective bottle blanks can be detected and removed before the bottle blanks enter a heating machine, the problems of blank clamping, blank insertion and the like of a transportation star wheel are reduced, and the running safety and stability of equipment are improved; and heating and bottle blowing of defective bottle blanks are not needed, so that energy consumption is also reduced.

Description

Technical Field

[0001] The invention relates to the technical field of plastic bottle processing equipment, and in particular to a bottle embryo rejection device and a bottle embryo detection and screening system. Background Art

[0002] At present, in the process of plastic bottle processing and production, due to the imperfect protection measures of the preforms in the transportation and storage links, the preforms will have defects such as preform mouth deformation, support ring damage, impurities in the preforms, etc., which will cause some of the preforms entering the heater in the bottle blowing device to have defects, which will cause the transport star wheel to get stuck, the preforms to get stuck, and trigger alarms; and it will also cause the machine to stop suddenly due to failure, causing damage to electrical components such as lights in the heater.

[0003] Therefore, how to improve the quality of preforms entering subsequent processing steps such as heating and bottle blowing is one of the important issues that need to be solved in the industry. Summary of the invention

[0004] One object of the present invention is to provide a bottle embryo rejection device, which can reject defective bottle embryos before entering a heating machine, reduce the occurrence of problems such as pregnancy pregnancy stuck and pregnancy pregnancy inserted by a transport star wheel, improve the safety and stability of equipment operation, and eliminate the need to heat and blow the defective bottle embryos, thereby reducing energy consumption to a certain extent.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] The preform rejecting device is arranged at the front side of the feeding port of the bottle blowing machine, and the preform rejecting device comprises:

[0007] A conveying mechanism, wherein the conveying mechanism comprises a conveying chain, the conveying chain is used to transport and convey the preforms, the conveying chain is provided with a notch, and an auxiliary piece is retractably connected to the notch to fill the conveying chain to form a complete conveying chain or to open the notch to form a rejection port;

[0008] The rejection mechanism includes a plurality of first blowing members and a plurality of second blowing members, the first blowing members and the second blowing members are both connected to an air supply device, the first blowing member is arranged at the top of the notch; the second blowing member is arranged at one side of the bottom of the notch, the first blowing member and the second blowing member are both used for blowing and rejecting the defective preforms, and the blowing directions of the first blowing member and the second blowing member are different.

[0009] Optionally, a first driving member is provided at one end of the auxiliary member, and the first driving member is used to drive the auxiliary member to perform linear motion in a direction toward or away from the gap to fill or open the gap.

[0010] Optionally, the first driving component is a cylinder, and the cylinder is connected to an air supply device to enable the cylinder to drive the auxiliary component.

[0011] Optionally, an air tank is connected between the air cylinder and the air supply device, and driving gas is stored in the air tank to assist the continuous driving operation of the first driving member.

[0012] Optionally, the first driving member is further connected to a first control valve, and the first control valve is used to control the on-off between the first driving member and the air supply device; and / or,

[0013] The first blowing member is connected to a second control valve, and the second control valve is used to control the on-off between the first blowing member and the air supply device; and / or,

[0014] The second air blowing member is connected to a third control valve, and the third control valve is used to control the on-off between the second air blowing member and the air supply device.

[0015] Optionally, the rejection mechanism further comprises a preform receiving hopper, which is arranged downstream of the second blowing member in the blowing direction, and a buffer is provided on the inner surface of the preform receiving hopper to buffer the bottle preform falling therein.

[0016] Optionally, the position of the first blowing member is adjustable; and / or,

[0017] The position of the second blowing member is adjustable.

[0018] Optionally, the rejection mechanism further includes a first adjustment component, the first adjustment component includes a first adjustment rod, a second adjustment rod, a first clamping block, a second clamping block and an adjustment plate; the first adjustment rod is extended along the first direction, and the second adjustment rod is extended along the second direction;

[0019] One end of the second adjusting rod is detachably connected to the first adjusting rod through the first clamping block, and the first clamping block can slide on the first adjusting rod along the first direction and can rotate around the first adjusting rod;

[0020] The other end of the second adjustment rod is detachably connected to an adjustment plate through the second clamping block, and the second clamping block can slide on the second adjustment rod along the second direction and can rotate around the second adjustment rod;

[0021] The first blowing member is fixed to the adjusting plate, which is provided with a waist-shaped hole. The second clamp is detachably connected with a fastener, which is slidably connected to the waist-shaped hole so that the adjusting plate can rotate around the axis of the third direction. The first direction, the second direction and the third direction are perpendicular to each other.

[0022] Optionally, the above-mentioned rejection mechanism also includes a second adjustment component, and the above-mentioned second adjustment component includes a third adjustment rod and a third clamping block; the above-mentioned third adjustment rod is extended along the first direction, and the above-mentioned second blowing member is detachably connected to the above-mentioned third adjustment rod through the above-mentioned third clamping block, and the above-mentioned third clamping block can slide on the above-mentioned third adjustment rod along the above-mentioned first direction and the above-mentioned third clamping block can rotate around the above-mentioned third adjustment rod.

[0023] Another object of the present invention is to provide a preform detection and screening system, which can detect and effectively remove defective preforms before entering the warming machine, reduce the occurrence of problems such as preform jamming and preform insertion on the transport star wheel, and improve the safety and stability of equipment operation.

[0024] To achieve this object, the present invention adopts the following technical solutions:

[0025] The preform detection and screening system comprises an imaging detection system and the preform rejection device, wherein the imaging detection system is used to detect the quality of the preforms transferred to the station before the station where the notch is located in the preform rejection device.

[0026] Beneficial effects of the present invention:

[0027] The present invention provides a preform rejection device and a preform detection and screening system. A notch is provided on a conveying chain for conveying preforms, and the notch is retractably connected to an auxiliary part, so that the defective preforms can be dropped out of the conveying chain by opening the auxiliary part at the notch; and then the dropped defective preforms are transported to a designated position by the joint action of a first blowing part and a second blowing part. The preform rejection device not only realizes the rejection of defective preforms, but also limits the rejection direction of the preforms, avoiding the problem of equipment damage caused by the random falling of the preforms, and improving the reliability of the preform rejection device and the operating safety and stability of the bottle blowing machine.

[0028] An imaging detection system is set up to detect whether the preforms are defective, and then the defective preforms are effectively rejected by the preform rejection device before entering the bottle blowing machine, reducing the occurrence of problems such as preform jamming and preform insertion on the transport star wheel, and improving the safety and stability of equipment operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is an axonometric diagram of a preform rejecting device provided in a specific embodiment of the present invention;

[0030] Figure 2 It is a cross-sectional view of a preform rejecting device provided in a specific embodiment of the present invention.

[0031] In the figure:

[0032] 10. Conveying mechanism; 11. Conveying chain; 111. Transport star wheel; 112. Guard plate; 113. Notch; 12. Driving assembly;

[0033] 21. Auxiliary component; 22. First driving component; 23. Gas storage tank; 24. First control valve;

[0034] 30. Rejection mechanism; 31. First blowing member; 32. Second blowing member; 33. Second control valve; 34. Embryo receiving bucket; 35. First adjustment assembly; 351. First adjustment rod; 352. Second adjustment rod; 353. First clamping block; 354. Second clamping block; 355. Adjustment plate; 36. Second adjustment assembly; 361. Third adjustment rod; 362. Third clamping block;

[0035] 40. Base;

[0036] 200. Bottle embryo. DETAILED DESCRIPTION

[0037] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0038] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0040] In the description of this embodiment, the terms "upper", "lower", "left", "right", etc., and the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of description and simplified operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0041] Refer to the following Figure 1 and Figure 2 The present invention introduces a preform rejecting device and a preform detecting and screening system.

[0042] It should be noted that the first direction Figure 1 The Z direction in is the vertical direction, and the second direction is Figure 1 The X direction in the third direction is Figure 1 In the Y direction, the X direction, Y direction and Z direction are perpendicular to each other.

[0043] This embodiment provides a preform rejecting device, which is arranged at the front side of the feeding port of the bottle blowing machine to reject defective preforms 200 in advance.

[0044] Please refer to Figure 1 and Figure 2 Specifically, the preform rejection device includes a conveying mechanism 10 and a rejection mechanism 30. The conveying mechanism 10 includes a conveying chain 11, which is used to transport and convey the preforms 200. The conveying chain 11 is provided with a gap 113, and the gap 113 is telescopically connected with an auxiliary member 21 to fill the conveying chain 11 to form a complete or open the gap 113 to form a rejection port; the rejection mechanism 30 includes a plurality of first blowing members 31 and a plurality of second blowing members 32, the first blowing members 31 and the second blowing members 32 are both connected with an air supply device, the first blowing member 31 is arranged at the top of the gap 113; the second blowing member 32 is arranged at one side of the bottom of the gap 113, the first blowing member 31 and the second blowing member 32 are both used to blow and reject defective preforms 200, and the first blowing member 31 and the second blowing member 32 have different blowing directions.

[0045] The preform rejection device in this embodiment is provided with a notch 113 on the conveying chain 11 for conveying the preforms 200, and the notch 113 is retractably connected to an auxiliary member 21, so that the defective preforms can be dropped out of the conveying chain by opening the auxiliary member 21 at the notch 113; and then the dropped defective preforms 200 are transported to a designated position by the joint action of the first blowing member 31 and the second blowing member 32. The preform rejection device not only realizes the rejection of defective preforms 200, but also limits the rejection direction of the preforms 200, thereby preventing the problem of equipment damage caused by the random falling of the preforms 200, and improving the reliability of the preform rejection device and the operating safety and stability of the bottle blowing machine.

[0046] Please refer to Figure 1 and Figure 2 In this embodiment, the conveying chain 11 includes a transport star wheel 111 and a guard plate 112. The guard plate 112 is arc-shaped and is spaced apart from the transport star wheel 111 to form a ring-shaped transport line for the preforms 200 with multiple transport stations.

[0047] Specifically, a notch 113 is provided at a position of the guard plate 112 corresponding to any work station to form a rejection opening. The transportation of the preform 200 is ensured only when the auxiliary member 21 fills the notch 113. When the auxiliary member 21 is away from the notch 113, the preform 200 is in a free state and can be rejected from the transport chain by the first blowing member 31 and the second blowing member 32.

[0048] Furthermore, the conveying mechanism 10 also includes a driving component 12 , and an output end of the driving component 12 is connected to the transport star wheel 111 to drive the transport star wheel 111 .

[0049] Optionally, the driving component 12 includes a driving structure and a transmission member, the output end of the driving structure is connected to the transmission member, the transmission member is connected to the transport star wheel 111, and the driving structure transmits the driving force to the transport star wheel 111 through the transmission member to realize the driving function of the driving component 12.

[0050] In this embodiment, a first driving member 22 is provided at one end of the auxiliary member 21, and the first driving member 22 is used to drive the auxiliary member 21 to move linearly toward or away from the gap 113 to fill or open the gap 113. When in use, the auxiliary member 21 can be driven by driving the first driving member 22, thereby filling and opening the gap 113.

[0051] Optionally, the first driving member 22 may be a linear motor, a cylinder or other structures, which are not specifically limited here.

[0052] Specifically, the first driving member 22 in the present embodiment is a cylinder, and the cylinder is connected to an air supply device to realize the driving of the auxiliary member 21 by the cylinder. The cylinder is selected because the first blowing member 31 and the second blowing member 32 use the air supply device. Therefore, the first driving member 22 is a cylinder and can also be directly connected to the air supply device to realize the driving of the auxiliary member 21.

[0053] Furthermore, a gas storage tank 23 is connected between the gas cylinder and the gas supply device, and driving gas is stored in the gas storage tank 23 to assist the continuous driving operation of the first driving member 22. This arrangement is to ensure that if there are several consecutive bottle preforms 200 that are defective bottle preforms 200, it is necessary to continuously drive the auxiliary member 21 away from the notch 113. If the gas supply device is directly used to supply gas through the pipeline, there may be insufficient gas supply, resulting in failure to meet the continuous rejection operation. The arrangement of the gas storage tank 23 ensures that when the first driving member 22 is continuously operating, its gas flow rate meets the demand for continuous rejection operation, thereby improving the reliability of the bottle preform rejection device.

[0054] Optionally, the cylinder uses a high-speed direct-acting cylinder to increase the reaction speed of the first driving member 22, so that the bottle preform 200 can be rejected more quickly and reliably, and has its own limiting function, without impacting the notch 113 of the guard plate 112, and will not cause the bottle preform 200 to jump during transportation.

[0055] Optionally, the first driving member 22 is also connected to a first control valve 24, which is used to control the on-off between the first driving member 22 and the air supply device; and / or, the first blowing member 31 is connected to a second control valve 33, which is used to control the on-off between the first blowing member 31 and the air supply device; and / or, the second blowing member 32 is connected to a third control valve, which is used to control the on-off between the second blowing member 32 and the air supply device. In this way, the first driving member 22 and / or the first blowing member 31 and / or the second blowing member 32 have separate control valves to control their own working states.

[0056] Preferably, the first driving member 22 is also connected to a first control valve 24, which is used to control the on-off of the first driving member 22 and the air supply device; the first blowing member 31 is connected to a second control valve 33, which is used to control the on-off of the first blowing member 31 and the air supply device; the second blowing member 32 is connected to a third control valve. This arrangement realizes the separate control of the action time and the blowing time of the three structures to meet more needs.

[0057] Specifically, the first control valve 24 , the second control valve 33 and the third control valve are all electromagnetic valves, which have the advantages of low energy consumption, low cost and rapid response.

[0058] Optionally, the air outlet of the first driving member 22 is further provided with a quick exhaust valve. The provision of the quick exhaust valve shortens the reaction time and improves the operating speed of the first driving member 22 .

[0059] Please continue to refer to Figure 1 and Figure 2 In the present embodiment, the number of the first blowing members 31 and the second blowing members 32 can be set according to actual needs. In the present embodiment, one first blowing member 31 is provided, and two second blowing members 32 are provided.

[0060] Optionally, the position of the first blowing member 31 is adjustable; and / or the position of the second blowing member 32 is adjustable. Setting the first blowing member 31 and / or the second blowing member 32 to be adjustable in position is conducive to effectively adjusting the falling direction of the preform 200, thereby improving the adaptability of the preform rejecting device.

[0061] Further optionally, the positions of the first blowing member 31 and the second blowing member 32 are adjustable to further increase the adjustment range of the falling direction of the preform 200 , thereby further improving the adaptability of the preform rejecting device.

[0062] Specifically, the rejection mechanism 30 also includes a first adjustment component 35, which includes a first adjustment rod 351, a second adjustment rod 352, a first clamp 353, a second clamp 354 and an adjustment plate 355; the first adjustment rod 351 is extended along the first direction, and the second adjustment rod 352 is extended along the second direction; one end of the second adjustment rod 352 is detachably connected to the first adjustment rod 351 through the first clamp 353, and the first clamp 353 can slide on the first adjustment rod 351 along the first direction and the first clamp 353 can rotate around the first adjustment rod 351; the displacement of the first blowing member 31 along the Z direction and the swing adjustment around the Z axis can be realized. In addition, the other end of the second adjustment rod 352 is detachably connected to the adjustment plate 355 through the second clamp 354, and the second clamp 354 can slide on the second adjustment rod 352 along the second direction and the second clamp 354 can rotate around the second adjustment rod 352; thus, the displacement of the first blowing member 31 along the X direction and the swing adjustment around the X axis can be achieved. The first blowing member 31 is fixed to the adjustment plate 355, and the adjustment plate 355 is provided with a waist-shaped hole. The second clamp 354 is detachably connected to a fastener, and the fastener is slidably connected to the waist-shaped hole, so that the adjustment plate 355 rotates around the axis direction of the third direction, and the first direction, the second direction and the third direction are perpendicular to each other; thus, the swing adjustment of the first blowing member 31 along the Y axis can be achieved, thereby achieving the adjustment of the position of the first blowing member 31 in various directions.

[0063] Furthermore, the rejection mechanism 30 also includes a second adjustment component 36, which includes a third adjustment rod 361 and a third clamping block 362; the third adjustment rod 361 is extended along the first direction, and the second blowing member 32 is detachably connected to the third adjustment rod 361 through the third clamping block 362, and the third clamping block 362 can slide on the third adjustment rod 361 along the first direction and the third clamping block 362 can rotate around the third adjustment rod 361. The displacement of the second blowing member 32 along the Z direction and the swing adjustment around the Z axis can be achieved, that is, the position adjustment of the second blowing member 32 in the required direction can be achieved.

[0064] Specifically, the first clamp block 353, the second clamp block 354 and the third clamp block 362 all adopt the same clamp block structure, which is provided with an open fixing hole. The open fixing hole can be mounted on the corresponding first adjustment rod 351, the second adjustment rod 352 or the third adjustment rod 361. The opening of the fixing hole is tightened under the action of bolt fixing to achieve the fixation of the clamp block structure, and when the bolt is not tightened, its position can be adjusted.

[0065] Furthermore, the rejection mechanism 30 further includes a preform receiving hopper 34, which is disposed downstream of the second blowing member 32 in the blowing direction to receive the dropped defective preforms 200. In this embodiment, the preform receiving hopper 34 is a semi-enclosed structure to receive the preforms 200 obliquely above.

[0066] Optionally, a buffer is provided on the inner surface of the embryo receiving bucket 34 to buffer the bottle preforms 200 dropped therein, thereby preventing the bottle preforms 200 from being ejected when dropped therein and causing each bottle preform 200 to collide and fall outside the embryo receiving bucket 34 .

[0067] In this embodiment, the preform rejecting device further includes a base 40 to support and install the conveying mechanism 10 , the rejecting mechanism 30 , and the auxiliary component 21 .

[0068] This embodiment also provides a preform detection and screening system, which includes an imaging detection system and a preform rejection device as described in any of the above schemes, wherein the imaging detection system is used to detect the quality of the preforms 200 that are transferred to the station before the station where the notch 113 is located in the preform rejection device. By setting up the imaging detection system to detect whether the preforms 200 are defective, and then effectively rejecting the defective preforms 200 through the preform rejection device before entering the bottle blowing machine, the occurrence of problems such as preform jamming and preform insertion on the transport star wheel 111 is reduced, and the safety and stability of equipment operation are improved.

[0069] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. The preform rejecting device is characterized by: Arranged at the front side of the feeding port of the bottle blowing machine, the preform rejecting device comprises: A conveying mechanism (10), the conveying mechanism (10) comprising a conveying chain (11), the conveying chain (11) being used to transport and convey bottle preforms (200), the conveying chain (11) being provided with a notch (113), the notch (113) being telescopically connected to an auxiliary component (21) to fill the conveying chain (11) to form a complete one or to open the notch (113) to form a rejection opening; The rejection mechanism (30) comprises a plurality of first blowing members (31) and a plurality of second blowing members (32), wherein the first blowing members (31) and the second blowing members (32) are both connected to an air supply device, wherein the first blowing member (31) is arranged at the top of the notch (113); and the second blowing member (32) is arranged at one side of the bottom of the notch (113), wherein the first blowing member (31) and the second blowing member (32) are both used for blowing and rejecting the defective preform (200), and the blowing directions of the first blowing member (31) and the second blowing member (32) are different.

2. The preform rejecting device according to claim 1, characterized in that: A first driving member (22) is provided at one end of the auxiliary member (21), and the first driving member (22) is used to drive the auxiliary member (21) to perform linear motion in a direction toward or away from the gap (113) to fill or open the gap (113).

3. The preform rejecting device according to claim 2, characterized in that: The first driving member (22) is a cylinder, and the cylinder is connected to an air supply device to enable the cylinder to drive the auxiliary member (21).

4. The preform rejecting device according to claim 3, characterized in that: An air storage tank (23) is also connected between the air cylinder and the air supply device, and driving gas is stored in the air storage tank (23) to assist the continuous driving operation of the first driving member (22).

5. The preform rejecting device according to claim 3, characterized in that: The first driving member (22) is further connected to a first control valve (24), and the first control valve (24) is used to control the on-off between the first driving member (22) and the air supply device; and / or, The first blowing member (31) is connected to a second control valve (33), and the second control valve (33) is used to control the on-off between the first blowing member (31) and the air supply device; and / or, The second air blowing member (32) is connected to a third control valve, and the third control valve is used to control the connection and disconnection between the second air blowing member (32) and the air supply device.

6. The preform rejecting device according to claim 1, characterized in that: The rejection mechanism (30) further comprises a preform receiving bucket (34), wherein the preform receiving bucket (34) is arranged downstream of the second blowing member (32) in the blowing direction, and a buffer is provided on the inner surface of the preform receiving bucket (34) to buffer the bottle preform (200) falling therein.

7. The preform rejecting device according to any one of claims 1 to 6, characterized in that: The position of the first blowing member (31) is adjustable; and / or, The position of the second blowing member (32) is adjustable.

8. The preform rejecting device according to claim 7, characterized in that: The rejecting mechanism (30) further comprises a first adjusting assembly (35), the first adjusting assembly (35) comprising a first adjusting rod (351), a second adjusting rod (352), a first clamping block (353), a second clamping block (354) and an adjusting plate (355); the first adjusting rod (351) is extended along a first direction, and the second adjusting rod (352) is extended along a second direction; One end of the second adjustment rod (352) is detachably connected to the first adjustment rod (351) via the first clamping block (353); the first clamping block (353) can slide on the first adjustment rod (351) along the first direction and the first clamping block (353) can rotate around the first adjustment rod (351); The other end of the second adjustment rod (352) is detachably connected to an adjustment plate (355) via the second clamping block (354); the second clamping block (354) can slide on the second adjustment rod (352) along the second direction and the second clamping block (354) can rotate around the second adjustment rod (352); The first blowing member (31) is fixed to the adjusting plate (355), the adjusting plate (355) is provided with a waist-shaped hole, the second clamping block (354) is detachably connected with a fastener, the fastener is slidably connected to the waist-shaped hole, so that the adjusting plate (355) can rotate around the axis direction of the third direction, and the first direction, the second direction and the third direction are perpendicular to each other.

9. The preform rejecting device according to claim 7, characterized in that: The rejecting mechanism (30) further comprises a second adjusting assembly (36), wherein the second adjusting assembly (36) comprises a third adjusting rod (361) and a third clamping block (362); the third adjusting rod (361) is extended along a first direction, the second blowing member (32) is detachably connected to the third adjusting rod (361) via the third clamping block (362), the third clamping block (362) can slide on the third adjusting rod (361) along the first direction, and the third clamping block (362) can rotate around the third adjusting rod (361).

10. The preform detection and screening system is characterized by: The invention comprises an imaging detection system and a preform rejection device according to any one of claims 1 to 9, wherein the imaging detection system is used to detect the quality of the preform (200) which flows to a station before the station where the notch (113) is located in the preform rejection device.

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