Preform feeding device of bottle blow-molding machine, and bottle blow-molding machine

Abstract

A preform feeding device of a bottle blow-molding machine, and a bottle blow-molding machine. The preform feeding device comprises a left preform feeding base (100), a right preform feeding base (200), a preform feeding star wheel (400), a preform blocking mechanism (500), and a telescopic mechanism (600), wherein the left preform feeding base (100) and the right preform feeding base (200) are arranged spaced apart from each other and define a preform feeding channel (300); one of the left preform feeding base (100) and the right preform feeding base (200) is provided with a blowing nozzle (700); the preform feeding channel (300) has a notch (310); the preform feeding star wheel (400) is provided with a plurality of teeth (410); some of the teeth (410) are located in the preform feeding channel (300); when the preform feeding star wheel (400) rotates, a preform (10) in the preform feeding channel (300) can be pushed to move; the preform blocking mechanism (500) has a preform blocking member (510) capable of extending into the preform feeding channel (300) through the notch (310) so as to block the preform (10) from moving; and the telescopic mechanism (600) has a movable member (610) arranged corresponding to the notch (310).

Description

Preform feeding device and blow molding machine

[0001] This application claims priority to Chinese Patent Application No. 202510215989.6, filed with the Chinese Patent Office on February 26, 2025, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of blow molding machine technology, for example to a preform feeding device and a blow molding machine. Background Technology

[0003] The main processes in blow molding to form bottles from preforms include preform preparation, heating, and blow molding. After preform preparation, the preforms enter the feeding star wheel, which then rotates them to the heating unit. With increasing market demand, blow molding machines require higher output and faster speeds. This can lead to preform jamming and overload issues when the preforms enter the feeding star wheel, causing sudden equipment shutdowns, increasing production costs, and potentially damaging parts.

[0004] Currently, the preform feeding method in blow molding machines involves the preform entering the left and right preform feed seats from the lower preform chute, transitioning from the left and right preform feed seats to the preform feed star wheel, and then sliding down into the preform feed star wheel under its own weight. If the preform feeder fails to deliver the preform in time, resulting in insufficient thrust, or if the preform jumps or the support rings of two adjacent preforms stack together, the preform may fail to smoothly enter the preform transport station of the preform feed star wheel. This can cause the teeth of the preform feed star wheel to press against the preform, resulting in preform feed overload and causing the equipment to stop abruptly. Summary of the Invention

[0005] The purpose of this application is to provide a preform feeding device for a blow molding machine. This device can promptly discharge the preform from the preform feeding channel when the tip of the preform feeding star wheel abuts against it, thereby avoiding preform overload and reducing the probability of sudden equipment stoppage.

[0006] The second objective of this application is to provide a blow molding machine that can quickly discharge preforms that become misaligned during the preform feeding process, thereby avoiding preform overload and reducing the probability of sudden equipment shutdown.

[0007] To achieve this objective, the following technical solution is adopted in this application:

[0008] This application discloses a preform feeding device for a blow molding machine, comprising: a left preform feeding seat and a right preform feeding seat, the left and right preform feeding seats being spaced apart and defining a preform feeding channel, one of the left and right preform feeding seats being provided with a blow molding nozzle, the preform feeding channel having a notch; a preform feeding star wheel, the preform feeding star wheel being provided with a plurality of gear teeth, some of the gear teeth being located in the preform feeding channel, the preform feeding star wheel being able to push the preform in the preform feeding channel to move when it rotates; a preform blocking mechanism, the preform blocking mechanism having a preform blocking member that can extend into the preform feeding channel from the notch to block the movement of the preform; a telescopic mechanism, the telescopic mechanism having a movable member provided corresponding to the notch; the skewed preform can move away from the preform feeding star wheel under the action of the gear teeth so that the movable member retracts, and at the same time the preform blocking member is inserted into the preform feeding channel to block the subsequent movement of the preform, the blow molding nozzle being able to blow the skewed preform out of the preform feeding channel.

[0009] In some embodiments, the telescopic mechanism further includes a drive cylinder and a first detection element, wherein the piston rod of the drive cylinder is connected to the movable element; the first detection element is configured to detect the stroke of the movable element, and when the stroke of the movable element reaches a first specified stroke, the piston rod of the drive cylinder automatically retracts, and the preform stopper is inserted into the preform inlet channel to block the subsequent movement of the preform.

[0010] In some embodiments, the first specified stroke is 2.5mm-3mm.

[0011] In some embodiments, the telescopic mechanism further includes a counter, which is configured to record the number of times the first detection element is triggered, and when the number of times the first detection element is triggered reaches a specified number within a first specified time period, the preform feeding device of the blow molding machine stops.

[0012] In some embodiments, the telescopic mechanism further includes a second detection element, which is configured to detect the stroke of the piston rod. When the stroke of the piston rod reaches a second specified stroke, the second detection element can be triggered. After the triggering time of the second detection element reaches a second specified time, the piston rod of the drive cylinder automatically extends, and the preform stopper leaves the preform inlet channel to release the subsequent preform to continue moving.

[0013] In some embodiments, the second specified duration is 4 to 6 seconds.

[0014] In some embodiments, the blow nozzle is installed at one end of the right preform holder near the telescopic mechanism.

[0015] In some embodiments, the blank-blocking mechanism includes: a mounting base having a through hole; a blank-blocking drive member, the blank-blocking drive member being mounted on the mounting base, the blank-blocking member being mounted on the power output end of the blank-blocking drive member, and passing through the through hole.

[0016] In some embodiments, the preform feeding device of the blow molding machine further includes a guard plate disposed around the preform feeding star wheel and located radially outside the preform feeding star wheel, and defining a preform exit channel between the guard plate and the preform feeding star wheel.

[0017] This application also discloses a blow molding machine, including the preform feeding device and frame of the blow molding machine described above, wherein the preform feeding device of the blow molding machine is installed on the frame.

[0018] The beneficial effects of the preform feeding device of the blow molding machine of this application are as follows: In actual operation, if the preform is tilted, the tilted preform will be squeezed by the gear teeth when it enters the preform feeding star wheel from the preform feeding channel. When the preform passes through the notch, it will move away from the preform feeding star wheel so that the moving part retracts. At the same time as the moving part retracts, the preform blocking part is inserted into the preform feeding channel from the notch to block the subsequent preform from continuing to move. The blow molding nozzle can quickly blow air toward the stuck preform to make it disengage from the preform feeding star wheel, avoid preform overload, and thus reduce the probability of sudden equipment stoppage.

[0019] The beneficial effects of the blow molding machine of this application are as follows: Due to the preform feeding device of the blow molding machine described above, when the preform is stuck on the tip of the tooth of the preform feeding star wheel, on the one hand, the preform blocking mechanism can block the subsequent preform from continuing to move, and on the other hand, the blow molding nozzle can quickly blow air toward the stuck preform to make it disengage from the preform feeding star wheel, thereby avoiding the phenomenon of preform overload in the blow molding machine and reducing the probability of sudden equipment stoppage. Attached Figure Description

[0020] Figure 1 is a schematic diagram of the preform feeding device of the blow molding machine according to an embodiment of this application during normal preform feeding;

[0021] Figure 2 is a schematic diagram of the structure of the preform feeding device of the blow molding machine according to an embodiment of this application when the preform feeding is abnormal;

[0022] Figure 3 is a structural schematic diagram of the structure described in Figure 2 from another angle.

[0023] Figure label:

[0024] 100. Left preform inlet; 200. Right preform inlet; 300. Preform inlet channel; 310. Notch; 400. Preform inlet star wheel; 410. Gear teeth; 500. Preform blocking mechanism; 510. Preform blocking component; 520. Mounting base; 530. Preform blocking drive component; 600. Telescopic mechanism; 610. Moving component; 620. Drive cylinder; 700. Bottle blowing nozzle; 800. Protective plate; 810. Preform passage; 900. Frame; 10. Bottle preform. Detailed Implementation

[0025] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. The specific embodiments described herein are merely illustrative of the present application and are not intended to limit the scope of the application. For ease of description, only the parts relevant to the present application are shown in the drawings, not the entire structure.

[0026] In the description of this application, unless otherwise expressly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0027] In the description of this embodiment, the terms "upper," "lower," "left," "right," "front," and "rear," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0028] This application discloses a preform feeding device for a blow molding machine. Referring to Figures 1 and 2, the preform feeding device includes a left preform feeding seat 100, a right preform feeding seat 200, a preform feeding star wheel 400, a preform blocking mechanism 500, and a telescopic mechanism 600. The left preform feeding seat 100 and the right preform feeding seat 200 are spaced apart and define a preform feeding channel 300. One of the left preform feeding seat 100 and the right preform feeding seat 200 is provided with a blow molding nozzle 700. The preform feeding channel 300 has a notch 310. The preform feeding star wheel 400 is provided with multiple teeth 410, some of which are located in the preform feeding channel 300. The preform feeding star wheel 400 rotates. The preform 10 in the preform inlet channel 300 can be moved. The preform blocking mechanism 500 has a preform blocking member 510 that can extend into the preform inlet channel 300 from the notch 310 to block the movement of the preform 10. The telescopic mechanism 600 has a movable member 610 corresponding to the notch 310. The tilted preform 10 can move away from the preform star wheel 400 under the action of the tooth tip of the gear 410 so that the movable member 610 retracts. At the same time, the preform blocking member 510 is inserted into the preform inlet channel 300 to block the subsequent preform 10 from continuing to move. The blow nozzle 700 can blow the tilted preform 10 out of the preform inlet channel 300.

[0029] As shown in Figure 1, when a normal preform 10 enters the preform star wheel 400 from the preform inlet channel 300, the preform 10 is just stuck in the tooth groove of the tooth 410 of the preform star wheel 400. At this time, the preform 10 will not be squeezed by the tooth tip of the tooth 410. When the preform 10 passes through the notch 310, there will be no phenomenon of squeezing the moving part 610. If the preform 10 becomes skewed, as shown in Figure 2, when the skewed preform 10 enters the preform star wheel 400 from the preform inlet channel 300, the preform 10 will be squeezed by the gear teeth 410. When the preform 10 passes the notch 310, it will move away from the preform star wheel 400 so that the movable part 610 retracts. At the same time as the movable part 610 retracts, the preform blocking part 510 is inserted into the preform inlet channel 300 from the notch 310 to prevent the subsequent preform 10 from continuing to move. The bottle blowing nozzle 700 can quickly blow air toward the stuck preform 10 to make it disengage from the preform star wheel 400, avoid preform overload, and thus reduce the probability of sudden equipment stoppage.

[0030] Referring to Figures 1 and 3, the telescopic mechanism 600 further includes a drive cylinder 620 and a first detection element (not shown). The piston rod of the drive cylinder 620 is connected to the movable member 610. The first detection element is configured to detect the stroke of the movable member 610. When the stroke of the movable member 610 reaches a first specified stroke, the piston rod of the drive cylinder 620 automatically retracts, and the preform stopper 510 is inserted into the preform inlet channel 300 to prevent subsequent preforms 10 from continuing to move. In actual operation, a relatively small degree of misalignment of the preform 10 will not affect normal preform inlet. If preforms 10 with relatively small misalignment are also blown out of the preform inlet channel 300, it will reduce the preform inlet efficiency of the preform inlet device of the blow molding machine. In this embodiment, a first detection element is added. Only when the first detection element detects that the stroke of the movable member 610 has reached the first specified stroke will the piston rod of the drive cylinder 620 automatically retract, and the preform stopper 510 be inserted into the preform inlet channel 300 to prevent subsequent preforms 10 from continuing to move. This configuration can prevent preforms 10 with a small degree of misalignment from being blown out of the preform inlet channel 300, which does not affect the preform feeding process, thus helping to ensure the preform feeding efficiency of the preform feeding device of the blow molding machine.

[0031] In the embodiments of this application, the first detection element is a magnetic detection switch. Of course, in other embodiments of this application, the first detection element can also be selected from other types of sensors according to actual needs.

[0032] In some embodiments, the air pressure of the drive cylinder 620 can be set to 2 bar to 3 bar, and the thrust of the drive cylinder 620 must be less than the value protected by the torque limiter of the preform feeding device of the blow molding machine, so as to avoid the excessive thrust of the drive cylinder 620 affecting the normal operation of the preform feeding device of the blow molding machine.

[0033] In some embodiments, the first specified stroke is 2.5mm-3mm. Specifically, the specified stroke can be 2.5mm, 2.51mm, 2.52mm, 2.53mm, 2.54mm, 2.55mm, 2.56mm, 2.57mm, 2.58mm, 2.59mm, 2.6mm, 2.61mm, 2.62mm, 2.63mm, 2.64mm, 2.65mm, 2.66mm, 2.67mm, 2.68mm, 2.69mm, 2.7mm, 2.71mm, 2.72mm, 2.73mm, 2.7... The specified stroke lengths are 4mm, 2.75mm, 2.76mm, 2.77mm, 2.78mm, 2.79mm, 2.8mm, 2.81mm, 2.82mm, 2.83mm, 2.84mm, 2.85mm, 2.86mm, 2.87mm, 2.88mm, 2.89mm, 2.9mm, 2.91mm, 2.92mm, 2.93mm, 2.94mm, 2.95mm, 2.99mm, 2.97mm, 2.98mm, 2.99mm, and 3mm. Of course, the first specified stroke can also be any other value within the range of 2.5mm-3mm, not limited to the examples listed above. If the first specified stroke is set too small, the preform 10 with a small degree of misalignment that does not affect the preform feeding process will be blown out of the preform feeding channel 300. Conversely, if the first specified stroke is set too large, it will cause the preform 10 with a large degree of misalignment that affects the preform feeding process to experience preform overload. In this embodiment, the first specified stroke is controlled between 2.5mm and 3mm. This can prevent preforms with a small degree of misalignment that do not affect the preform feeding process from being blown out of the preform feeding channel 300, thereby ensuring the preform feeding efficiency of the preform feeding device of the blow molding machine. It can also ensure that preforms with a large degree of misalignment that affect the preform feeding process are stably discharged from the preform feeding channel 300, thus avoiding the occurrence of preform overload.

[0034] In other embodiments of this application, the size of the first specified stroke can be selected according to actual needs and is not limited to the above limitations.

[0035] In some embodiments, the telescopic mechanism 600 further includes a counter, configured to record the number of times the first detection element is triggered. When the number of times the first detection element is triggered reaches a specified number within a first specified time period, the preform feeding device of the blow molding machine stops. During the operation of the preform feeding device of the blow molding machine, preform misalignment should be considered an occasional fault. If preform misalignment occurs too frequently within a certain period, it indicates structural damage to the preform feeding device of the blow molding machine, such as misalignment of the preform star wheel 400, left preform seat 100, and right preform seat 200, requiring shutdown for maintenance. In this embodiment, a counter is added to record the number of times the first detection element is triggered, and the preform feeding device of the blow molding machine stops when the number of times the first detection element is triggered reaches a specified number within a first specified time period. This enables the preform feeding device of the blow molding machine to automatically stop when a component malfunctions, facilitating user maintenance. In some embodiments, the first specified time period is 30 minutes, and the specified number of triggers is 5. Setting the first specified duration and number of times too short will increase the probability of misjudgment, while setting them too long will prevent the feeding device from stopping quickly when a component malfunctions. In this embodiment, the first specified duration is 30 minutes and the number of times is 5. This ensures judgment accuracy, reduces the probability of misjudgment, and allows for quick shutdown when a component malfunctions in the feeding device, facilitating maintenance by staff. Of course, in other embodiments of this application, the first specified duration and number of times can be adjusted according to actual needs and are not limited to the examples above.

[0036] The control logic of the counter, the first detection element, and the drive cylinder 620 can be selected according to relevant technologies in the field of automatic control, and there is no need to describe or limit the control logic of the counter, the first detection element, and the drive cylinder 620 here.

[0037] In some embodiments, the telescopic mechanism 600 further includes a second detection element (not shown). The second detection element is configured to detect the stroke of the piston rod. When the stroke of the piston rod reaches a second specified stroke, the second detection element is triggered. After the triggering time of the second detection element reaches the second specified time, the piston rod of the drive cylinder 620 automatically extends, and the preform stopper 510 leaves the preform inlet channel 300 to release the subsequent preform 10 to continue moving. By setting the second detection element, after the triggering time of the second detection element reaches the second specified time, the piston rod of the drive cylinder 620 automatically extends, and the preform stopper 510 leaves the preform inlet channel 300 to release the subsequent preform 10 to continue moving. This ensures that after the skewed preform 10 is blown out of the preform inlet channel 300, the movable part 610 returns to the position aligned with the notch 310 to prepare for the subsequent skewed preform 10 to be squeezed. At the same time, the preform stopper 510 leaves the preform inlet channel 300 to release the subsequent preform 10 to continue moving, ensuring the normal operation of the preform inlet process.

[0038] In some embodiments, the second specified duration is 4 to 6 seconds. Specifically, the second specified duration can be 4.1 seconds, 4.2 seconds, 4.3 seconds, 4.4 seconds, 4.5 seconds, 4.6 seconds, 4.7 seconds, 4.8 seconds, 4.9 seconds, 5 seconds, 5.1 seconds, 5.2 seconds, 5.3 seconds, 5.4 seconds, 5.5 seconds, 5.6 seconds, 5.7 seconds, 5.8 seconds, or 5.9 seconds. Of course, the second specified duration can also be selected from other values ​​within the range of 4 to 6 seconds according to actual needs, and is not limited to the examples above. If the second specified duration is too short, the piston rod of the drive cylinder 620 may automatically extend before the skewed preform 10 has been blown out of the preform inlet channel 300, causing the movable part 610 to return to a position flush with the notch 310 under the push of the piston rod, thus increasing the risk of preform overload. If the second specified duration is too long, the movable part 610 and the preform stopper 510 may not reset for a period of time after the skewed preform 10 has been blown out of the preform inlet channel 300, reducing the preform feeding efficiency of the preform feeding device of the blow molding machine. In this embodiment, the second specified duration is controlled between 4 and 6 seconds, which ensures that the movable part 610 and the preform stopper 510 reset a short time after the skewed preform 10 has been blown out of the preform inlet channel 300, thus helping to ensure the preform feeding efficiency of the preform feeding device of the blow molding machine.

[0039] In the embodiments of this application, the second detection element is a magnetic detection switch. Of course, in other embodiments of this application, the second detection element can also be selected from other types of sensors according to actual needs.

[0040] In other embodiments of this application, the size of the second specified duration can be selected according to actual needs and is not limited to the above limitations.

[0041] Referring to Figures 1-3, a blow-through nozzle 700 is installed at the end of the right preform inlet 200 near the telescopic mechanism 600. Since the notch 310 is located between the right preform inlet 200 and the preform inlet star wheel 400, the installation of the blow-through nozzle 700 at the end of the right preform inlet 200 near the telescopic mechanism 600 ensures that any preforms 10 that become misaligned during the preform inlet process are blown out of the preform inlet channel 300. In some embodiments, an additional blow-through nozzle 700 can be installed above the preform inlet channel 300 at the position corresponding to the notch 310. Thus, the airflow from the two blow-through nozzles 700 further ensures that any preforms 10 that become misaligned during the preform inlet process are blown out of the preform inlet channel 300. The specific structure of the blow-through nozzle 700 and the connection method of the air path can be selected according to actual needs; therefore, the relevant parameters of the blow-through nozzle 700 are not limited here.

[0042] Referring to Figures 1-3, the preform blocking mechanism 500 includes a mounting base 520 and a preform blocking drive 530. The mounting base 520 has a through hole. The preform blocking drive 530 is mounted on the mounting base 520, and the preform blocking member 510 is mounted on the power output end of the preform blocking drive 530 and passes through the through hole. In actual operation, when the first detection member detects that the stroke of the moving member 610 has reached the first specified stroke, the piston rod of the drive cylinder 620 automatically retracts, and the preform blocking drive 530 drives the preform blocking member 510 to move within the through hole and insert into the preform inlet channel 300 to block the subsequent preform 10 from continuing to move. By setting the preform blocking drive 530, the preform blocking member 510 can be stably inserted into the preform inlet channel 300 during operation to block the movement of the subsequent preform 10, avoiding the phenomenon that the blow-off nozzle 700 blows out the subsequently moving preform 10. The mounting base 520 facilitates the installation of the blank-blocking drive component 530, and the perforation serves to guide the blank-blocking component 510, preventing the blank-blocking component 510 from becoming skewed.

[0043] In an alternative embodiment of this application, the telescopic mechanism 600 may not include the drive cylinder 620, but instead adopt a structure in which a telescopic spring or telescopic rod connects the movable part 610. This can also achieve the function of the tilted preform 10 moving away from the preform feeding star wheel 400 under the action of the tooth tip of the gear 410 so that the movable part 610 can retract.

[0044] In an alternative embodiment of this application, the blank-blocking mechanism 500 may not include the blank-blocking drive member 530, but instead is provided with a linkage mechanism, in which the blank-blocking member 510 is linked with the movable member 610 when the movable member 610 retracts so that the blank-blocking member 510 extends into the blank-entry channel 300.

[0045] Referring to Figures 1-3, the preform feeding device of the blow molding machine also includes a guard plate 800. The guard plate 800 is arranged around the preform feeding star wheel 400 and is located radially outside the preform feeding star wheel 400. A preform delivery channel 810 is defined between the guard plate 800 and the preform feeding star wheel 400. By setting the guard plate 800, a preform delivery channel 810 is formed between the guard plate 800 and the preform feeding star wheel 400, ensuring that the preform 10 can be stably transported to the next station.

[0046] This application also discloses a blow molding machine, including the preform feeding device and frame 900 described above, with the preform feeding device mounted on the frame 900. Because of the preform feeding device described above, when the preform 10 gets stuck on the tip of the tooth 410 of the preform feeding star wheel 400, on the one hand, the preform blocking mechanism 500 can prevent subsequent preforms 10 from continuing to move; on the other hand, blowing air can quickly blow air towards the stuck preform 10, causing it to disengage from the preform feeding star wheel 400, thus avoiding preform overload in the blow molding machine and reducing the probability of sudden equipment stoppage.

[0047] In the description of this specification, the references to terms such as "some embodiments," "other embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

Claims

1. A preform feeding device for a blow molding machine, comprising: A left embryo feeder (100) and a right embryo feeder (200) are provided, the left embryo feeder (100) and the right embryo feeder (200) are spaced apart and define an embryo feed channel (300), one of the left embryo feeder (100) and the right embryo feeder (200) is provided with a blow nozzle (700), and the embryo feed channel (300) has a notch (310); An infeed star wheel (400) is provided with multiple gear teeth (410), some of which are located in the infeed channel (300). When the infeed star wheel (400) rotates, it can drive the bottle preform (10) in the infeed channel (300) to move. A preform blocking mechanism (500) having a preform blocking member (510) that can extend from the notch (310) into the preform inlet channel (300) to block the movement of the preform (10); Telescopic mechanism (600), the telescopic mechanism (600) having a movable member (610) provided corresponding to the notch (310); The skewed preform (10) can move away from the preform feeding star wheel (400) under the action of the tooth tip of the gear (410) so that the movable part (610) retracts. At the same time, the preform blocking part (510) is inserted into the preform feeding channel (300) to block the subsequent movement of the preform (10). The blow nozzle (700) can blow the skewed preform (10) out of the preform feeding channel (300).

2. The preform feeding device for the blow molding machine according to claim 1, wherein, The telescopic mechanism (600) further includes a drive cylinder (620) and a first detection element. The piston rod of the drive cylinder (620) is connected to the movable part (610). The first detection element is configured to detect the stroke of the movable part (610). When the stroke of the movable part (610) reaches a first specified stroke, the piston rod of the drive cylinder (620) automatically retracts, and the preform stopper (510) is inserted into the preform inlet channel (300) to block the subsequent movement of the preform (10).

3. The preform feeding device for the blow molding machine according to claim 2, wherein, The first specified stroke is 2.5mm-3mm.

4. The preform feeding device for the blow molding machine according to claim 2, wherein, The telescopic mechanism (600) further includes a counter, which is configured to record the number of times the first detection element is triggered. When the number of times the first detection element is triggered reaches a specified number within a first specified time period, the preform feeding device of the blow molding machine stops.

5. The preform feeding device for a blow molding machine according to claim 2, wherein, The telescopic mechanism (600) further includes a second detection element, which is configured to detect the stroke of the piston rod. When the stroke of the piston rod reaches a second specified stroke, the second detection element can be triggered. After the triggering time of the second detection element reaches the second specified time, the piston rod of the drive cylinder (620) automatically extends, and the preform stopper (510) leaves the preform inlet channel (300) to release the subsequent preform (10) to continue moving.

6. The preform feeding device for a blow molding machine according to claim 5, wherein, The second specified duration is 4 to 6 seconds.

7. The preform feeding device for the blow molding machine according to claim 1, wherein, The blow nozzle (700) is installed at one end of the right preform inlet (200) near the telescopic mechanism (600).

8. The preform feeding device for the blow molding machine according to claim 1, wherein, The blank-blocking mechanism (500) includes: Mounting base (520) having through holes; A blank-blocking drive (530) is mounted on the mounting base (520), and a blank-blocking member (510) is mounted on the power output end of the blank-blocking drive (530) and passes through the through hole.

9. The preform feeding device of the blow molding machine according to claim 1 further includes a guard plate (800), the guard plate (800) being arranged around the preform feeding star wheel (400) and located radially outside the preform feeding star wheel (400), and defining a preform exit channel (810) between the guard plate (800) and the preform feeding star wheel (400).

10. A blow molding machine, comprising a preform feeding device and a frame (900) for a blow molding machine as described in any one of claims 1-9, wherein the preform feeding device is mounted on the frame (900).

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