Safety gate control system and method for a bottle blowing machine

Abstract

This invention provides a safety door control system and method for a blow molding machine, relating to the field of blow molding machine protection technology. It includes blow molding equipment and a protective housing. The blow molding equipment is housed within the protective housing. The protective housing has an opening for personnel to enter and exit. A door assembly is installed within the opening. The door assembly includes a door frame and a safety door. The safety door has a latch structure, and the door frame has a lock body with a lock hole for the latch structure to be inserted. The invention also includes a first control unit for controlling the power supply status of the blow molding equipment. When the latch structure separates from the lock hole, the first control unit can immediately detect the disengagement signal and quickly cut off the power supply circuit to the blow molding equipment. This interlocking mechanism ensures that operators cannot open the safety door to enter the protective housing during machine operation, thus effectively protecting the operator's personal safety.

Description

Technical Field

[0001] This invention relates to the field of blow molding machine protection technology, and more specifically, to a safety door control system and control method for blow molding machines. Background Technology

[0002] Rotary blow molding machines are devices that use blow molding processes to make hollow containers from plastic granules. Common types include one-step blow molding machines using PP and PE, injection stretch blow molding machines using PET, PC, or PP for two-step molding, and newly developed multi-layer blow molding and stretch blow molding machines. Most blow molding machines are still two-step blow molding machines, meaning that the plastic raw material must first be made into a preform before blow molding.

[0003] During the bottle blowing process, blow molding machines require protection. External protective covers are designed to prevent operators from accidentally entering hazardous areas (such as the mold closing area, tension rod movement area, and rotary table area) with their hands or other body parts while the machine is running, thus avoiding injuries from compression, shearing, or impact. The heating furnace (oven) area experiences very high temperatures; protective covers prevent burns from accidental contact with heating elements or high-temperature preforms. Additionally, noise reduction and dust prevention are necessary. Currently, the external protective door and the blow molding equipment are independently controlled, meaning that the equipment remains operational even when the external protective door is open, potentially leading to dangerous accidents. Summary of the Invention

[0004] The present invention aims to solve the problem that the existing external protective door and the blow molding equipment are controlled independently, which means that the blow molding equipment is still in operation when the external protective door is open, which may lead to dangerous accidents.

[0005] To address the aforementioned problems, in a first aspect, the present invention provides a safety door control system for a blow molding machine, comprising a blow molding device and a protective housing. The blow molding device is disposed within the protective housing, and the protective housing has an opening for personnel to enter and exit. A door assembly is disposed within the opening, the door assembly comprising a door frame and a safety door. The safety door is provided with a latch structure, and the door frame is provided with a lock body. The lock body has a lock hole for the latch structure to be inserted into. The system also includes a first control unit, which controls the power supply status of the blow molding device. The first control unit is configured to: power on the blow molding device when the latch structure is inserted into the corresponding lock hole; and de-power the blow molding device when the latch structure is disengaged from the corresponding lock hole.

[0006] The safety door control system for a blow molding machine provided by this invention has, but is not limited to, the following beneficial effects compared to the prior art: A safety interlock mechanism can be formed through the cooperation of the first control unit and the latch structure. When the latch structure is inserted into the lock hole, the first control unit can detect the latch structure's positioning signal and determine that the safety door is closed. At this time, the first control unit can control the power supply circuit of the blow molding equipment to close, energizing the equipment and putting it into operation. When the latch structure separates from the lock hole, the first control unit can immediately detect the latch structure's disengagement signal and quickly cut off the power supply circuit of the blow molding equipment, de-energizing and stopping its operation. This interlock mechanism ensures that operators cannot open the safety door and enter the protective housing during machine operation, thus effectively protecting their personal safety.

[0007] Furthermore, the lock body is provided with an electromagnetic induction structure, which is used to generate magnetism when energized, attracting the inserted latch structure.

[0008] Furthermore, the electromagnetic induction structure includes a locking block unit and an electromagnetic sensor along a direction perpendicular to the keyhole axis. The locking block unit and the electromagnetic sensor are distributed on both sides of the keyhole. The locking block unit includes a locking body and a return spring that move along a direction perpendicular to the keyhole axis. A corresponding groove is formed on the lock body to accommodate the locking body and the return spring. One end of the return spring is connected to the corresponding locking body, and the other end of the return spring is connected to the inner wall of the corresponding groove. The latch structure includes a bolt that is slidably mounted on the security door. The bolt can be inserted into the corresponding keyhole. A locking hole is opened at a corresponding position on the bolt. When the electromagnetic sensor is energized, the corresponding locking body is attracted closer.

[0009] Furthermore, the blow molding equipment is powered by a power source, and the first control unit is electrically connected to the latch structure, the blow molding equipment, the power source, and the electromagnetic induction structure.

[0010] Furthermore, it also includes a second control unit, which is disposed outside the protective housing. The second control unit is equipped with a shutdown unit and an unlocking unit. The shutdown unit is also used to control the power supply status of the blow molding equipment, and the unlocking unit is used to control the power supply status of the electromagnetic induction structure.

[0011] Furthermore, the circuit of the first control unit for controlling the power supply status of the blow molding equipment and the circuit of the shutdown unit for controlling the power supply status of the blow molding equipment are connected in parallel.

[0012] Furthermore, the end of the locking body facing the electromagnetic sensor is provided with a chamfer or rounded corner, and when the electromagnetic sensor is de-energized, the corresponding end of the locking body protrudes out of the groove.

[0013] Secondly, the present invention also provides a safety door control method for a blow molding machine, which is applied to the safety door control system of the blow molding machine described above. When the door latch structure is inserted into the corresponding lock hole, the first control unit powers on the blow molding equipment; when the door latch structure is separated from the corresponding lock hole, the first control unit de-powers on the blow molding equipment.

[0014] Furthermore, when the latch structure is inserted into the corresponding lock hole and the locking body contacts the corresponding electromagnetic sensor, the first control unit powers on the blow molding equipment; otherwise, the first control unit de-powers the blow molding equipment.

[0015] Furthermore, the unlocking unit can only control the electromagnetic induction structure to de-energize when the blow molding equipment is in a power-off state; otherwise, the electromagnetic induction structure is in a energized state. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure when the present invention is applied to a protective housing; Figure 2 This is a schematic diagram of the overall structure of the present invention; Figure 3 This is a schematic diagram of the enlarged structure of the lock body in this invention; Figure 4 This is a cross-sectional view of the lock body and latch structure in this invention. Figure 5 This is a three-dimensional enlarged structural diagram of the second control unit in this invention; Figure 6 This is a control block diagram in the present invention.

[0017] Explanation of reference numerals in the attached figures: 1. Blow molding equipment; 2. Protective housing; 3. Door assembly; 31. Door frame; 32. Safety door; 33. Door latch structure; 331. Bolt; 34. Lock body; 341. Lock hole; 4. First control unit; 5. Electromagnetic induction structure; 6. Locking block unit; 61. Locking body; 62. Return spring; 63. Locking hole; 7. Electromagnetic sensor; 8. Second control unit; 81. Stop unit; 82. Unlocking unit. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. It should be understood that the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments described in this application without creative effort will fall within the scope of protection of this application.

[0019] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the specification of this application is for the purpose of describing specific embodiments only and is not intended to limit this application; the terms "comprising," "including," "having," "containing," etc., in the specification, claims, and accompanying drawings of this application are open-ended terms. Therefore, "comprising," "including," or "having" refers to, for example, a method or apparatus having one or more steps or elements, but is not limited to having only these one or more elements. The terms "first," "second," etc., in the specification, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0020] In the description of this invention, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, 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 invention.

[0021] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0022] It should be emphasized that when the term "comprising / including" is used in this specification, it is used to explicitly indicate the presence of the stated feature, integer, step, or component, but does not exclude the presence or addition of one or more other features, integers, steps, parts, or groups of features, integers, steps, or parts.

[0023] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0024] Referring to the figure, a safety door control system for a blow molding machine according to an embodiment of the present invention includes a blow molding device 1 and a protective housing 2. The blow molding device 1 is disposed inside the protective housing 2. An opening for personnel to enter and exit the protective housing 2 is formed on the protective housing 2. A door assembly 3 is disposed in the opening. The door assembly 3 includes a door frame 31 and a safety door 32. A latch structure 33 is disposed on the safety door 32. A lock body 34 is disposed on the door frame 31. A lock hole 341 for the latch structure 33 to be inserted is formed on the lock body 34. The system also includes a first control unit 4. The first control unit 4 is used to control the power supply status of the blow molding device 1. The first control unit 4 is configured to: when the latch structure 33 is inserted into the corresponding lock hole 341, the first control unit 4 powers on the blow molding device 1; when the latch structure 33 is separated from the corresponding lock hole 341, the first control unit 4 de-powers the blow molding device 1.

[0025] In this embodiment, the blow molding equipment 1 can be any type of rotary blow molding machine, such as a hollow extrusion blow molding machine that uses PP and PE for one-time molding, an injection stretch blow molding machine that uses PET, PC or PP for two-time molding, or a new type of blow molding machine with multi-layer hollow extrusion blow molding or stretch blow molding functions.

[0026] The blow molding equipment 1 is electrically coupled to the first control unit 4. When the first control unit 4 detects that the latch structure 33 is fully inserted into the lock hole 341, it can send an energizing signal to the blow molding equipment 1 to enable the blow molding equipment 1 to enter the working state. Conversely, when the latch structure 33 is separated from the lock hole 341, the first control unit 4 can immediately cut off the power supply to the blow molding equipment 1 to realize the safety interlock function.

[0027] In one possible embodiment, the latch structure 33 itself can be part of the control circuit of the first control unit 4. When the latch structure 33 is inserted into the lock hole 341, that is, when the latch structure 33 and the lock body 34 make contact, it is equivalent to the switch being turned on, creating a closed loop and forming a current path, so that the power supply circuit of the first control unit 4 controls the blow molding device 1 is turned on.

[0028] The protective housing 2 can use channel steel as the supporting frame. Channel steel is a long strip of steel with a U-shaped cross section. It belongs to carbon structural steel for construction and machinery. It is a type of steel with a complex cross section. The channel steel supports the entire protective cover to ensure rigidity and stability and prevent loosening due to machine vibration. The outer surface of the protective housing 2 can be covered with powder-coated steel plate. The modular design of the steel plate can facilitate disassembly and transportation, and at the same time, it can reduce noise and prevent dust from entering the equipment.

[0029] The door assembly 3 is located at the opening of the protective housing 2, and can be used to allow operators to enter and exit the protective housing 2 to perform equipment maintenance, troubleshooting, or preform replacement.

[0030] The door frame 31 can be fixedly installed around the opening, and the safety door 32 can be hinged or slidably installed on the door frame 31. An openable sealed connection can be formed between the safety door 32 and the door frame 31.

[0031] When the safety door 32 is closed, the latch structure 33 can be inserted into the lock hole 341 of the lock body 34 to achieve mechanical locking.

[0032] The first control unit 4 may include a programmable logic controller (PLC), a safety relay, or a dedicated safety controller. The first control unit 4 and the latch structure 33 can detect the insertion state of the latch structure 33 through mechanical contacts or electromagnetic induction.

[0033] The overall structure enables a door lock linkage function, meaning that the blow molding equipment 1 can only be powered on and run when the safety door 32 is closed and the door latch structure 33 is inserted into the lock hole 341; when the safety door 32 is opened, the blow molding equipment 1 is immediately powered off and stopped, which can effectively prevent operators from entering the danger zone while the machine is running, and avoid squeezing, shearing or impact injuries.

[0034] By cooperating with the first control unit 4 and the latch structure 33, a safety interlocking mechanism can be formed. When the latch structure 33 is inserted into the lock hole 341, the first control unit 4 can detect the positioning signal of the latch structure 33 and determine that the safety door 32 is closed. At this time, the first control unit 4 can control the power supply circuit of the blow molding equipment 1 to close, so that the blow molding equipment 1 is powered on and enters the working state. When the latch structure 33 is separated from the lock hole 341, the first control unit 4 can immediately detect the disengagement signal of the latch structure 33 and quickly cut off the power supply circuit of the blow molding equipment 1, so that the blow molding equipment 1 is powered off and stops operating.

[0035] This interlocking mechanism ensures that operators cannot open the safety door 32 and enter the protective housing 2 during machine operation, thus effectively protecting the personal safety of operators.

[0036] When safety door 32 is opened, the blow molding equipment 1 immediately stops operating, which can prevent operators from entering the danger zone without their knowledge.

[0037] Optionally, the lock body 34 is provided with an electromagnetic induction structure 5, which is used to generate magnetism when energized to attract the inserted latch structure 33.

[0038] In this embodiment, the electromagnetic induction structure 5 can be disposed inside or on the surface of the lock body 34. The electromagnetic induction structure 5 includes components such as an electromagnetic coil and an iron core. When the electromagnetic induction structure 5 is energized, the current can flow through the electromagnetic coil and generate a magnetic field around the iron core. This magnetic field can attract the latch structure 33, making the latch structure 33 more firmly held in the lock hole 341.

[0039] By setting the electromagnetic induction structure 5, the locking effect of the latch structure 33 can be enhanced, preventing the latch structure 33 from accidentally disengaging due to vibration or external impact.

[0040] The electromagnetic induction structure 5 can also be electrically connected to the first control unit 4, which can control the power-on and power-off states of the electromagnetic induction structure 5.

[0041] When the latch structure 33 is inserted into the lock hole 341, the first control unit 4 can supply power to the electromagnetic induction structure 5, causing the electromagnetic induction structure 5 to generate magnetism and attract the latch structure 33; when it is necessary to open the security door 32, the first control unit 4 can first cut off the power supply to the electromagnetic induction structure 5, causing the magnetism to disappear, and then the latch structure 33 can be smoothly pulled out from the lock hole 341.

[0042] This electromagnetic adsorption mechanism can further improve the locking reliability of the security door 32, while also enabling rapid unlocking.

[0043] Optionally, the electromagnetic induction structure 5 can be an electromagnetic lock. When the current passes through the coil inside the lock body, it generates a strong magnetic field that can firmly hold the latch on the door. It automatically unlocks upon power failure, meeting fire escape requirements and preventing people from being trapped inside. The outer shell of the electromagnetic lock is typically made of high-strength engineering plastic or metal, and can have an IP65 or IP67 protection rating, making it dustproof, waterproof, and oil-resistant, suitable for the high-temperature, high-humidity, and oily working environment of blow molding machines.

[0044] The electromagnetic induction structure 5 achieves a dual locking effect by generating a magnetic attraction to the latch structure 33. On one hand, the mechanical structure achieves physical locking through the cooperation of the latch structure 33 and the keyhole 341; on the other hand, the electromagnetic structure enhances the locking force through magnetic attraction. This dual locking mechanism effectively prevents the security door 32 from being accidentally opened due to external impact or vibration, improving the reliability of security protection.

[0045] When the electromagnetic induction structure 5 is de-energized, the magnetism disappears, and the latch structure 33 can return to its free state, making it easy for the operator to pull out the latch structure 33 from the lock hole 341 and open the safety door 32.

[0046] Optionally, the electromagnetic induction structure 5 includes a locking block unit 6 and an electromagnetic sensor 7 along a direction perpendicular to the axis of the lock hole 341. The locking block unit 6 and the electromagnetic sensor 7 are distributed on both sides of the lock hole 341. The locking block unit 6 includes a locking body 61 that moves along a direction perpendicular to the axis of the lock hole 341 and a return spring 62. A corresponding groove is formed on the lock body 34 to accommodate the locking body 61 and the return spring 62. One end of the return spring 62 is connected to the corresponding locking body 61, and the other end of the return spring 62 is connected to the inner wall of the corresponding groove. The latch structure 33 includes a pin 331 that is slidably disposed on the safety door 32. The pin 331 can be inserted into the corresponding lock hole 341. A locking hole 63 is provided at a corresponding position on the pin 331. When the electromagnetic sensor 7 is energized, the corresponding locking body 61 is attracted closer.

[0047] In this embodiment, the locking block unit 6 of the electromagnetic induction structure 5 can be disposed inside the lock body 34. The locking block unit 6 includes a locking body 61 and a return spring 62.

[0048] The locking body 61 can be a columnar or block-shaped structure made of ferromagnetic material. The locking body 61 can be slidably disposed in the groove of the lock body 34. The sliding direction of the locking body 61 can be perpendicular to the axial direction of the lock hole 341.

[0049] When the electromagnetic sensor 7 is de-energized, the reset spring 62 can pull the locking body 61 back into the corresponding groove, causing the end portion of the locking body 61 to protrude from the groove. When the electromagnetic sensor 7 is energized, the magnetic field generated by the electromagnetic sensor 7 can attract the locking body 61 to move towards the electromagnetic sensor 7.

[0050] When the pin 331 is inserted into the lock hole 341, the locking hole 63 on the pin 331 can correspond to the position of the locking body 61 on one side of the lock hole 341.

[0051] When the electromagnetic sensor 7 is energized, the locking body 61 can be attracted to move towards the center of the lock hole 341 and engage in the locking hole 63 of the bolt 331, thereby locking the bolt 331.

[0052] This locking mechanism prevents the bolt 331 from being accidentally pulled out of the keyhole 341, thus enhancing the locking effect of the security door 32.

[0053] The return spring 62 can be a helical spring, leaf spring or elastic sheet, etc. One end of the return spring 62 can be fixedly connected to the locking body 61, and the other end of the return spring 62 can be fixedly connected to the inner wall of the groove.

[0054] When the electromagnetic sensor 7 is de-energized, the spring force of the reset spring 62 can restore the locking body 61 to its initial position.

[0055] By setting the reset spring 62, it can be ensured that the locking body 61 can be reliably reset after the electromagnetic sensor 7 is de-energized, which facilitates the next locking operation.

[0056] The locking body 61 of the locking block unit 6 can move along the axis perpendicular to the lock hole 341. When the electromagnetic sensor 7 is energized, the locking body 61 can be attracted to move towards the electromagnetic sensor 7 and be inserted into the locking hole 63 on the pin 331 to achieve mechanical locking. When the electromagnetic sensor 7 is de-energized, the return spring 62 can spring the locking body 61 back to the initial position, so that the locking body 61 is disengaged from the locking hole 63 and the locking of the pin 331 is released.

[0057] The locking and unlocking functions of the bolt 331 can be achieved by the reciprocating movement of the locking body 61. The movement direction of the locking body 61 is perpendicular to the axis of the lock hole 341, which can avoid axial force on the bolt 331 during the locking and unlocking process, thus making the locking and unlocking operation smoother and more stable.

[0058] When the electromagnetic sensor 7 is energized, the locking body 61 is attracted through the locking hole 63 and comes into contact with the end face of the electromagnetic sensor 7, at which point a positioning signal is triggered.

[0059] The return spring 62 ensures that the locking body 61 can be reliably reset when the power is off, ensuring that each locking operation can be performed normally.

[0060] The pin 331 can be a columnar component made of metal or high-strength engineering plastic. One end of the pin 331 can be provided with a handle or pull ring for easy gripping, and the other end can be provided with an insertion part that is adapted to the lock hole 341.

[0061] The latch 331 can be slidably installed in the guide rail or groove on the safety door 32, and the sliding direction of the latch 331 can be consistent with the opening and closing direction of the safety door 32.

[0062] When the operator closes the safety door 32, he can push the bolt 331 to slide towards the lock body 34, so that the insertion part of the bolt 331 is inserted into the lock hole 341; when it is necessary to open the safety door 32, the bolt 331 can be pulled to pull the insertion part out of the lock hole 341.

[0063] The locking hole 63 on the pin 331 can be a blind hole or a through hole, and the position of the locking hole 63 can correspond to the locking body 61 on one side of the lock hole 341.

[0064] When the pin 331 is fully inserted into the lock hole 341, the locking body 61 can move under the action of the electromagnetic sensor 7 and lock into the lock hole 63, thereby locking the pin 331.

[0065] This locking structure prevents the bolt 331 from being accidentally pulled out while locked, thus enhancing the locking effect of the security door 32.

[0066] Optionally, the pin 331 can be T-shaped, L-shaped, or key-shaped, and is inserted into the lock body to trigger locking.

[0067] The shape of the insertion part of the bolt 331 can be adapted to the inner shape of the lock hole 341, ensuring that the bolt 331 can be smoothly inserted into the lock hole 341. The bolt 331 and the security door 32 can achieve relative movement through sliding connection, hinged connection or elastic connection, etc., and the specific connection method can be selected according to actual needs.

[0068] Optionally, the blow molding equipment 1 is powered by a power source, and the first control unit 4 is electrically connected to the latch structure 33, the blow molding equipment 1, the power source, and the electromagnetic induction structure 5.

[0069] In this embodiment, the power supply can be an AC power supply or a DC power supply, and the voltage and current specifications of the power supply can be determined according to the power requirements of the blow molding equipment 1.

[0070] The first control unit 4 may include a power input terminal, a signal input terminal, a control output terminal, and a power output terminal. The power input terminal of the first control unit 4 may be electrically connected to a power source, and the control output terminal of the first control unit 4 may be electrically connected to the power input terminal of the blow molding equipment 1.

[0071] The first control unit 4 and the latch structure 33 can transmit signals through safety contacts and monitoring contacts.

[0072] The safety contact (NC, normally closed contact) can be connected in series in the safety circuit. When the latch structure 33 is inserted into the lock hole 341, the safety contact can be physically closed; when the safety door 32 is opened, the safety contact can be physically opened, cutting off the safety circuit.

[0073] The monitoring contact (NO, normally open contact) can be used to provide feedback on the status of the latch structure 33 to the first control unit 4.

[0074] The door lock has safety contacts and monitoring contacts, both of which are controlled by a safety relay.

[0075] The safety contact is connected in series in the safety circuit and is physically disconnected when the door is opened. The monitoring contact is used to provide feedback on the door status to the PLC, and can detect whether the door latch is truly in place, preventing operators from using tape to stick the switch or using a magnet to deceive the sensor.

[0076] The first control unit 4 and the electromagnetic induction structure 5 can be electrically connected through a control circuit. The first control unit 4 can control the power supply and power-off of the electromagnetic induction structure 5.

[0077] When the first control unit 4 detects that the latch structure 33 is fully inserted into the lock hole 341, it can send an energizing signal to the electromagnetic induction structure 5 to make the electromagnetic induction structure 5 generate magnetism and lock the latch structure 33; when unlocking is required, the first control unit 4 can first cut off the power supply to the electromagnetic induction structure 5, and then control the blow molding equipment 1 to cut off the power.

[0078] Two independent signal lines can be used from the lock body to the control cabinet for cross-detection. With dual-channel signal input, if one of the signals fails (such as a broken wire or short circuit), the safety system will immediately identify and stop the machine, thus improving the reliability of the system.

[0079] Through a dual-channel signal detection mechanism, the first control unit 4 can monitor the signal status of the safety contact and the monitoring contact in real time.

[0080] When the two channels are consistent, it indicates that the safety door 32 is in normal condition, and the first control unit 4 can allow the blow molding equipment 1 to operate; when the two channels are inconsistent, it indicates that the safety circuit or monitoring circuit may be faulty, and the first control unit 4 can immediately trigger an emergency stop, cut off the power supply to the blow molding equipment 1, and stop the blow molding equipment 1 from operating.

[0081] The dual-channel signal input design enables redundant safety. Even if one signal fails, the other signal can still maintain the safety monitoring function, thereby ensuring the reliability of the safety system.

[0082] This dual-channel detection mechanism can effectively prevent safety system failures caused by cable breakage, contact welding, or sensor malfunction.

[0083] Optionally, the safety relay can be used for the detection and processing of dual-channel signals.

[0084] The safety relay can compare the logical relationship between the two channels in real time. When an inconsistency is detected, the safety relay can immediately output an emergency stop signal to cut off the power supply to the blow molding equipment 1.

[0085] Only when both the safety relay and the lock body signals are simultaneously fed back to the first control unit 4 can the machine circuit be connected and the machine start working; if either signal is missing, the machine will remain in a stopped state.

[0086] Optionally, it also includes a second control unit 8, which is disposed outside the protective housing 2. The second control unit 8 is provided with a shutdown unit 81 and an unlocking unit 82. The shutdown unit 81 is also used to control the power supply status of the blow molding equipment 1, and the unlocking unit 82 is used to control the power supply status of the electromagnetic induction structure 5.

[0087] In this embodiment, the second control unit 8 can be located on the outside of the protective housing 2, making it convenient for operators to operate.

[0088] The second control unit 8 may include components such as a housing, a display panel, buttons, and interfaces. The housing of the second control unit 8 may be made of metal or high-strength plastic, have a protection rating, and be adaptable to the working environment of the blow molding machine.

[0089] The second control unit 8 can be located outside the protective housing 2, away from the danger zone, so that the operator can control the blow molding equipment 1 from a safe position through the second control unit 8.

[0090] The shutdown unit 81 can be an emergency stop button or a shutdown switch. When the operator presses the shutdown unit 81, a shutdown signal can be sent to the blow molding equipment 1, causing the blow molding equipment 1 to stop running immediately.

[0091] The unlocking unit 82 can be an unlocking button or an unlocking switch. When the operator presses the unlocking unit 82, the electromagnetic induction structure 5 can be de-energized, thereby unlocking the latch structure 33.

[0092] The second control unit 8 and the first control unit 4 can be connected via a communication line. The second control unit 8 can send the operator's instructions to the first control unit 4, and the first control unit 4 will execute the corresponding control actions.

[0093] This setup allows operators to remotely control and monitor the blow molding equipment 1 from outside the protective housing 2, improving operational safety and convenience.

[0094] Optionally, the second control unit 8 can be a main control console, which is a human-machine interface and consists of a base, a human-machine interface, and important physical buttons.

[0095] The human-computer interaction interface can display a 3D model view of the entire device, with each door showing a lock and its opening / closing status dynamically changing, allowing for a clear observation of the standby status of all doors in the entire device.

[0096] When a door opens, the system will issue a red exclamation mark and stop the machine, displaying which door is open. Above this is a touchscreen, allowing direct button control of each security door's opening and closing.

[0097] The shutdown unit 81 can control the power supply status of the blow molding equipment 1. When the operator presses the shutdown unit 81, the shutdown unit 81 can send a shutdown signal to the first control unit 4. The first control unit 4 can then cut off the power supply to the blow molding equipment 1, causing the blow molding equipment 1 to stop operating.

[0098] The shutdown unit 81 can be used for quick shutdown in emergency situations. In case of an emergency, such as a problem inside the machine, water leakage, fire, or other serious accident, press this unit to stop the equipment, but keep the door lock closed to protect personnel outside the door. Then press the unlocking unit 82 to open the door.

[0099] The unlocking unit 82 can control the power supply status of the electromagnetic induction structure 5. When the operator presses the unlocking unit 82, the unlocking unit 82 can send a power-off signal to the electromagnetic induction structure 5. After the electromagnetic induction structure 5 is de-energized, it loses its magnetism, and the locking body 61 is reset under the action of the return spring 62, releasing the lock on the latch structure 33. The operator can then pull out the bolt 331 and open the safety door 32.

[0100] By coordinating the shutdown unit 81 and the unlocking unit 82, operators can quickly stop the machine in an emergency and unlock it after confirming safety, thus improving the flexibility and reliability of the safety door control system.

[0101] Optionally, the circuit of the first control unit 4 for controlling the power supply status of the blow molding equipment 1 and the circuit of the shutdown unit 81 for controlling the power supply status of the blow molding equipment 1 are connected in parallel.

[0102] In this embodiment, the control output terminal of the first control unit 4 and the control output terminal of the shutdown unit 81 can be connected in parallel to the power input terminal of the blow molding equipment 1. When either control loop detects a condition requiring shutdown, it can cut off the power supply to the blow molding equipment 1 to achieve safety protection.

[0103] This parallel design enables redundant control, ensuring that even if one control loop fails, the other control loop can still function normally, thus ensuring that the blow molding equipment 1 can stop operating in a timely manner under abnormal circumstances.

[0104] The circuit of the first control unit 4 can receive the status signal of the latch structure 33. When the latch structure 33 is disengaged from the lock hole 341, the first control unit 4 can cut off the power supply of the blow molding equipment 1. The circuit of the shutdown unit 81 can directly receive the shutdown command from the operator. When the operator presses the shutdown button, the shutdown unit 81 can cut off the power supply of the blow molding equipment 1.

[0105] By using a parallel circuit design, any shutdown condition can trigger the blow molding equipment 1 to stop operating, thus improving the reliability of safety protection.

[0106] Optionally, interlocking logic can also be set in the parallel circuit to prevent the system from becoming unstable due to the simultaneous operation of two control loops.

[0107] For example, when the first control unit 4 detects that the latch structure 33 is not inserted into the lock hole 341, it can lock the shutdown function of the shutdown unit 81 to ensure that the blow molding equipment 1 will not start if the door is not closed.

[0108] In this embodiment, by connecting the control circuit of the first control unit 4 and the control circuit of the shutdown unit 81 in parallel, dual safety protection can be achieved.

[0109] When the latch structure 33 disengages from the lock hole 341, the first control unit 4 can immediately cut off the power supply to the blow molding equipment 1 to achieve door lock linkage protection; when the operator needs to stop the machine in an emergency, the power supply to the blow molding equipment 1 can be cut off through the stop unit 81 to achieve manual quick stop protection.

[0110] Through this parallel design, any shutdown signal can trigger the blow molding equipment 1 to stop operating, forming a dual safety protection mechanism.

[0111] Even if one of the control loops fails, the other control loop can still function normally, ensuring that the blow molding equipment 1 can be stopped in time to avoid dangerous accidents.

[0112] This parallel circuit design can effectively improve the reliability and safety of the safety door control system.

[0113] Optionally, the end of the locking body 61 facing the electromagnetic sensor 7 is provided with a chamfer or rounded corner, and when the electromagnetic sensor 7 is de-energized, the corresponding end of the locking body 61 protrudes out of the groove.

[0114] In this embodiment, the end of the locking body 61 may be provided with a chamfer or a rounded corner. The angle of the chamfer or the radius of the rounded corner can be determined according to actual needs. For example, it can be a chamfer with an angle of 30°, 45°, 60°, etc., or a rounded corner with specifications of R1, R2, R3, etc.

[0115] The chamfering or rounding of the corners can make the locking body 61 move more smoothly and reduce interference with the inner wall of the lock hole 341 or the pin 331.

[0116] When the electromagnetic sensor 7 is de-energized, the locking body 61 can move to its initial position under the action of the return spring 62, and the end of the locking body 61 can protrude from the groove.

[0117] The end of the locking body 61 protruding from the groove can block the pin 331, preventing the pin 331 from being pulled out without being fully unlocked.

[0118] This design can further improve the locking reliability of the safety door 32 and prevent the latch structure 33 from accidentally disengaging due to misoperation or external impact.

[0119] Optionally, the end of the locking body 61 may be provided with a guide slope, which can guide the locking body 61 to move when the pin 331 is inserted into the lock hole 341, so as to facilitate the smooth insertion of the pin 331.

[0120] When the insertion part of the pin 331 contacts the guide slope of the locking body 61, it can push the locking body 61 into the groove so that the pin 331 can pass smoothly; then, when the locking hole 63 of the pin 331 is aligned with the position of the locking body 61, the locking body 61 pops out under the action of the return spring 62 and is locked into the locking hole 63, thus achieving locking.

[0121] Optionally, the chamfer angle at the end of the locking body 61 can be set between 30° and 60°, and the fillet radius can be set between 0.5mm and 2mm. The specific parameters can be determined according to the size and material properties of the locking body 61.

[0122] The chamfering or rounding of corners can reduce friction and interference between the locking body 61 and the surrounding structure during movement, thereby improving the reliability of the locking body 61's operation.

[0123] A safety door control method for a blow molding machine: when the latch structure 33 is inserted into the corresponding lock hole 341, the first control unit 4 powers on the blow molding equipment 1; when the latch structure 33 is separated from the corresponding lock hole 341, the first control unit 4 de-powers on the blow molding equipment 1.

[0124] In this embodiment, the safety door control method may include the following steps: In the closing procedure, the operator closes the protective door, and the bolt 331 on the door is inserted into the lock hole 341 of the lock body 34; During the detection process, the mechanical contacts inside the lock body 34 detect that the pin 331 is in place, and the safety contact closes. During the locking process, the safety relay detects that the safety circuit is closed and supplies power to the electromagnetic coil of the electromagnetic induction structure 5. The locking body 61 pops out and physically locks the pin 331. In the feedback step, the monitoring contact inside the lock body 34 closes, sending a door-locked signal to the first control unit 4; in the operation step, after receiving the confirmation signal, the first control unit 4 opens the circuit, allowing the blow molding equipment 1 to start.

[0125] This safety door control method ensures that the blow molding equipment 1 can only be powered on and operated when the safety door 32 is fully closed and the latch structure 33 is inserted into the lock hole 341.

[0126] When the safety door 32 is opened, the latch structure 33 disengages from the lock hole 341, and the first control unit 4 immediately cuts off the power supply to the blow molding equipment 1, causing the blow molding equipment 1 to stop operating.

[0127] This control method can effectively prevent operators from entering dangerous areas while the machine is running, thus improving the reliability of safety protection.

[0128] Safety door control methods can include three levels: normal operation logic, shutdown unlocking logic, and fail-safe logic.

[0129] Normal operating logic: During the closing step, the operator closes the protective door, and the latch 331 on the door inserts into the lock body 34; during the detection step, the mechanical contact inside the lock body 34 detects that the latch 331 is in place, and the safety contact closes; during the locking step, the safety relay detects that the safety circuit is closed, supplies power to the electromagnetic coil of the electromagnetic induction structure 5, the locking body 61 pops out, and physically locks the latch 331; during the feedback step, the monitoring contact inside the lock body 34 closes, sending a door locked signal to the first control unit 4; during the operation step, after receiving the confirmation signal, the first control unit 4 opens the circuit, allows the machine to start, and sends feedback to the main control console.

[0130] Only when both the safety relay and the lock body 34 signals are simultaneously fed back to the first control unit 4 can the machine circuit be connected and the machine start working; if either signal is missing, the machine will remain in a stopped state.

[0131] Shutdown and unlocking logic: For blow molding machines, the door cannot be opened immediately upon pressing the open button; the danger must be eliminated. In the request-to-stop step, the operator presses the unlocking unit 82 or the unlock command on the touchscreen; in the safe-stop step, the machine first executes the shutdown procedure, stopping mold closing, stopping the turntable, and releasing high-pressure gas; in the safety confirmation step, the sensors confirm that the mold has opened, the gas pressure has dropped to a safe value, and the moving parts have stopped; in the power-off unlocking step, the safety relay cuts off the power to the electromagnetic coil of the electromagnetic induction structure 5, and the locking body 61 retracts; in the door-opening signal-cutting step, the operator pulls open the door, the latch 331 is pulled out, the safety contact is physically disconnected, and the equipment circuit is shut down; in the maintenance-stop step, as long as the door is open, the machine cannot be restarted.

[0132] Fault-safe logic: During disconnection detection, if the cable connecting the door lock is cut, the dual-channel signals will be inconsistent, and the safety relay will immediately trigger an emergency stop; during contact welding, if the safety contacts are welded together due to excessive current, the monitoring contacts will detect the abnormal status, and the system will refuse to start again; during forced disconnection, even if the electromagnetic coil is stuck and cannot retract, when the door is forcibly pulled open, the mechanical structure design ensures that the safety contacts can be physically disconnected to ensure that the circuit is cut off; during power outage opening, if there is a sudden power outage, the electromagnetic coil loses power, the locking body 61 retracts, the bolt 331 unlocks, and the door can be opened.

[0133] Optionally, when the latch structure 33 is inserted into the corresponding lock hole 341 and the locking body 61 contacts the corresponding electromagnetic sensor 7, the first control unit 4 powers on the blow molding device 1; otherwise, the first control unit 4 de-powers the blow molding device 1.

[0134] In this embodiment, the first confirmation condition is that the latch structure 33 is inserted into the lock hole 341, indicating that the safety door 32 is closed; the second confirmation condition is that the locking body 61 contacts the electromagnetic sensor 7, indicating that the latch structure 33 is locked. Only when both confirmation conditions are met simultaneously will the first control unit 4 send an energizing signal to the bottle blowing device 1.

[0135] The dual confirmation logic can effectively prevent the bottle blowing equipment 1 from starting if the safety door 32 is not fully closed or locked.

[0136] When the latch structure 33 is inserted into the lock hole 341 but the locking body 61 does not contact the electromagnetic sensor 7, it indicates that the latch structure 33 may not be fully inserted or the locking mechanism may be faulty. At this time, the first control unit 4 can keep the blow molding equipment 1 in a de-energized state to prevent potential safety risks.

[0137] This dual-confirmation logic ensures the lock-on-close relationship; the blow molding equipment 1 can only be powered on and operated when the safety door 32 is fully closed and the electromagnetic lock is engaged; when the safety door 32 is opened or the lock is released, the blow molding equipment 1 is immediately powered off and stopped. This design improves the reliability of the safety door control system.

[0138] The dual confirmation logic can also be applied to the unlocking control process. When it is necessary to open the safety door 32, the first control unit 4 needs to confirm that the bottle blowing equipment 1 has stopped operating and the danger has been eliminated before it can control the electromagnetic induction structure 5 to cut off the power and unlock it.

[0139] The specific unlocking process may include: the operator presses the stop button, the first control unit 4 controls the blow molding equipment 1 to stop running; after the blow molding equipment 1 stops completely, the sensor detects that the mold closing mechanism has been opened, the air pressure has been released, and the moving parts have stopped; after the first control unit 4 confirms that the safety conditions are met, it controls the electromagnetic induction structure 5 to be de-energized, the locking body 61 is reset under the action of the return spring 62, and the lock on the latch structure 33 is released; the operator pulls out the pin 331 and opens the safety door 32.

[0140] This unlocking control mechanism ensures that safety door 32 can only be opened after the blow molding equipment 1 has completely stopped and the danger has been eliminated. For rotary blow molding machines, due to the large inertia and the time required for high-pressure gas release, simply opening the door to stop the machine is insufficient. The electromagnetic lock can forcibly lock the protective door before the machine has completely stopped and the pressure has been released, preventing personnel from prematurely opening the door and entering the danger zone.

[0141] Optionally, the unlocking unit 82 can only control the electromagnetic induction structure 5 to de-energize when the blow molding equipment 1 is in a power-off state; otherwise, the electromagnetic induction structure 5 is in a power-on state.

[0142] In this embodiment, the control function of the unlocking unit 82 can be interlocked with the power supply status of the blow molding equipment 1. Only when the blow molding equipment 1 is in a power-off state can the unlocking unit 82 send a power-off signal to the electromagnetic induction structure 5, control the electromagnetic induction structure 5 to de-energize and release the lock on the latch structure 33; when the blow molding equipment 1 is in a powered-on operating state, the control signal of the unlocking unit 82 can be shielded, the electromagnetic induction structure 5 remains powered on, and the latch structure 33 remains locked.

[0143] This interlock design prevents operators from opening the safety door 32 while the blow molding equipment 1 is running. When the blow molding equipment 1 is running, even if the operator presses the unlocking unit 82, the electromagnetic induction structure 5 will not be de-energized, the locking body 61 will remain in the locked position, preventing the pin 331 from being pulled out and the safety door 32 from being opened.

[0144] This design ensures that operators cannot enter hazardous areas while the machine is running, thus improving the reliability of safety protection.

[0145] If the door is open, the first control unit 4 cuts off the machine's power supply and control circuit to ensure that dangerous parts such as the mold closing mechanism, tension rod, and turntable cannot operate, preventing squeezing or shearing accidents during maintenance or handling of stuck bottles.

[0146] The interlocking design between the unlocking unit 82 and the power supply status of the blow molding equipment 1 can form a dual safety protection mechanism. On the one hand, the unlocking unit 82 can only control the electromagnetic induction structure 5 to de-energize when the blow molding equipment 1 is de-energized; on the other hand, the locking body 61 will only release the latch structure 33 after the electromagnetic induction structure 5 is de-energized, and the latch structure 33 can be pulled out from the lock hole 341.

[0147] This interlocking design effectively prevents operators from opening the safety door 32 while the blow molding equipment 1 is running. When the blow molding equipment 1 is powered on, even if the operator attempts to press the unlocking unit 82, the electromagnetic induction structure 5 remains energized, the locking body 61 remains locked, and the safety door 32 cannot be opened. Only after the blow molding equipment 1 has completely stopped operating can the operator unlock the safety door 32 via the unlocking unit 82, thus ensuring the operator's personal safety.

[0148] Optionally, the unlocking unit 82 can also be linked with the emergency stop button. When the operator presses the emergency stop button, the blow molding equipment 1 immediately stops with power cut off, but the electromagnetic induction structure 5 remains energized. The emergency stop button only cuts off the power supply to the blow molding equipment; the electromagnetic induction structure can be powered by an independent backup power supply, and the safety door 32 remains locked. At this time, the operator needs to press the unlocking unit 82 again to unlock the safety door 32. This design ensures that the safety door remains locked after an emergency stop, protecting the safety of personnel outside the safety door.

[0149] In addition, each door control has an emergency stop button. The emergency stop button can stop the machine and release pressure. In case of emergency, such as a problem inside the machine, water leakage, fire or other serious accident, press this button. At this time, the equipment will stop, but the door lock will not be opened, protecting the personnel outside the door. Then press the unlocking unit 82 to open the door.

[0150] The emergency stop button can be located on the second control unit 8 or in a conspicuous position on the outside of the protective housing 2, allowing operators to quickly access it in an emergency. The emergency stop button can be red or yellow with a clear label indicating its emergency stop function. When the operator presses the emergency stop button, an emergency stop signal is sent to the bottle blowing equipment 1, which immediately stops operating and triggers a high-pressure gas release procedure to rapidly reduce system pressure.

[0151] When the emergency stop button is pressed, the blow molding equipment 1 is powered off and stops, but the electromagnetic induction structure 5 remains energized, and the safety door 32 remains locked. This design ensures that the safety door will not open immediately in an emergency, protecting the safety of personnel outside the safety door.

[0152] Once the emergency is over, the operator can request to unlock the safety door 32 through the unlocking unit 82. After the first control unit 4 confirms safety, it controls the electromagnetic induction structure 5 to cut off power, releasing the lock on the door latch structure 33. The operator can then open the safety door 32 to enter the protective housing 2 to handle the fault.

[0153] Press the unlocking unit 82 directly. At this time, the PLC receives a signal and controls the equipment to stop, stop mold closing, stop the turntable, and release high-pressure gas. Then, when the sensor confirms that the mold has been opened, the gas pressure has dropped to a safe value, and the moving parts have stopped, the door lock is opened.

[0154] In other words, the electromagnetic lock forcibly locks the protective door before the machine completely stops and the pressure is released, preventing personnel from opening the door and entering the danger zone prematurely.

[0155] By combining the above-mentioned structures, a complete safety door control system for a blow molding machine can be achieved. This system integrates mechanical protection, electrical interlocking, and environmental control, providing comprehensive safety protection for operators.

[0156] In terms of mechanical protection, the protective housing 2 can enclose the blow molding equipment 1 to prevent operators from contacting dangerous parts; the safety door 32 and the latch structure 33 can form a physical isolation to prevent operators from entering the interior of the protective housing 2 while the machine is running.

[0157] In terms of electrical interlocking, the first control unit 4 and the second control unit 8 can form a linkage control with the latch structure 33 and the electromagnetic induction structure 5 to ensure that the blow molding equipment 1 can only operate when the safety door 32 is closed and locked; the blow molding equipment 1 must stop operating before the safety door 32 is opened. In terms of environmental control, the steel plate shell of the protective housing 2 can play a role in noise reduction, dust prevention, and heat insulation, thereby improving the working environment.

[0158] This safety door control system can effectively solve the problem that the independent control of the outer protective door and the blow molding equipment in the existing technology may lead to dangerous accidents, realize the door lock linkage function, and improve the safety performance of the blow molding machine.

[0159] Furthermore, this safety door control system can also be applied to other mechanical equipment requiring safety interlocks, such as injection molding machines, die-casting machines, and packaging machinery. By adjusting the specifications and parameters of each component, it can be adapted to the safety protection needs of different equipment.

[0160] While the present invention has been disclosed above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the scope of protection of the present invention.

Claims

1. A safety gate control system for a bottle blowing machine, characterized in that, The device includes a blow molding machine (1) and a protective housing (2). The blow molding machine (1) is located inside the protective housing (2). The protective housing (2) has an opening for people to enter and exit the protective housing (2). A door assembly (3) is provided in the opening. The door assembly (3) includes a door frame (31) and a safety door (32). The safety door (32) is provided with a latch structure (33). The door frame (31) is provided with a lock body (34). The lock body (34) has a lock hole (341) for the latch structure (33) to be inserted. The device also includes a first control unit (4). The first control unit (4) is used to control the power supply status of the blow molding machine (1). The first control unit (4) is configured to: when the latch structure (33) is inserted into the corresponding lock hole (341), the first control unit (4) powers on the blow molding machine (1); when the latch structure (33) is separated from the corresponding lock hole (341), the first control unit (4) de-powers on the blow molding machine (1).

2. The safety door control system of a bottle blowing machine according to claim 1, characterized in that, The lock body (34) is provided with an electromagnetic induction structure (5), which is used to generate magnetism when energized to attract the inserted latch structure (33).

3. The safety door control system for a blow molding machine according to claim 2, characterized in that, The electromagnetic induction structure (5) includes a locking block unit (6) and an electromagnetic sensor (7) along a direction perpendicular to the axis of the keyhole (341). The locking block unit (6) and the electromagnetic sensor (7) are distributed on both sides of the keyhole (341). The locking block unit (6) includes a locking body (61) that moves along a direction perpendicular to the axis of the keyhole (341) and a return spring (62). The lock body (34) has a corresponding groove for accommodating the locking body (61) and the return spring (62). One end of the return spring (62) is connected to the corresponding locking body (61), and the other end of the return spring (62) is connected to the inner wall of the corresponding groove. The latch structure (33) includes a pin (331) that is slidably disposed on the safety door (32). The pin (331) can be inserted into the corresponding lock hole (341). A locking hole (63) is provided at the corresponding position on the pin (331). When the electromagnetic sensor (7) is energized, the corresponding locking body (61) is attracted closer.

4. The safety door control system for a blow molding machine according to claim 3, characterized in that, The blow molding equipment (1) is powered by a power source, and the first control unit (4) is electrically connected to the latch structure (33), the blow molding equipment (1), the power source, and the electromagnetic induction structure (5).

5. The safety door control system for a blow molding machine according to claim 4, characterized in that, It also includes a second control unit (8), which is located outside the protective housing (2). The second control unit (8) is provided with a shutdown unit (81) and an unlocking unit (82). The shutdown unit (81) is also used to control the power supply status of the blow molding equipment (1), and the unlocking unit (82) is used to control the power supply status of the electromagnetic induction structure (5).

6. The safety door control system for a blow molding machine according to claim 5, characterized in that, The circuit of the first control unit (4) for controlling the power supply status of the blow molding equipment (1) is connected in parallel with the circuit of the shutdown unit (81) for controlling the power supply status of the blow molding equipment (1).

7. The safety door control system for a blow molding machine according to claim 3, characterized in that, The locking body (61) has a chamfer or rounded corner on the end facing the electromagnetic sensor (7). When the electromagnetic sensor (7) is de-energized, the corresponding end of the locking body (61) protrudes out of the groove.

8. A safety door control method for a blow molding machine, applied to the safety door control system of the blow molding machine according to any one of claims 1-6, characterized in that, When the latch structure (33) is inserted into the corresponding lock hole (341), the first control unit (4) powers on the blow molding device (1); when the latch structure (33) is separated from the corresponding lock hole (341), the first control unit (4) de-powers on the blow molding device (1).

9. The safety door control method for a blow molding machine according to claim 8, characterized in that, When the latch structure (33) is inserted into the corresponding lock hole (341) and the locking body (61) contacts the corresponding electromagnetic sensor (7), the first control unit (4) powers on the blow molding device (1); otherwise, the first control unit (4) de-powers on the blow molding device (1).

10. The safety door control method for a blow molding machine according to claim 8, characterized in that, When the blow molding equipment (1) is in a power-off state, the unlocking unit (82) can control the electromagnetic induction structure (5) to be de-energized; otherwise, the electromagnetic induction structure (5) is in a power-on state.

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