A smart factory special safety door lock system and detection feedback control method

Abstract

The application discloses a special safety door lock system and detection feedback control method for a smart factory, and the system comprises a door lock body, a special-shaped bolt and a proximity switch group; the door lock body is fixedly installed on a preset position of a left production line equipment protection door; an angle steel seat is welded on a preset position of a right production line equipment protection door and used for mounting the special-shaped bolt and the proximity switch group. The key switch is used for starting and switching the bolt detection control function on the side of the door lock body; when the proximity switch group detects that the bolt position is abnormal, the first gear primary bolt detection control function provides a bolt position abnormality light indication and a contact condition or control output by a normal detection relay, can be connected in series with or combined with a safety door lock system door machine interlocking function, and can be directly used to a production line equipment safety electrical hard control loop; the second gear secondary bolt detection control function has the function of the first gear function and can directly output a response of the door lock body and directly limit the production line equipment operation and use when the bolt is seriously dislocated.

Description

Technical Field

[0001] This application relates to the field of safety door locks for controlling automated production lines and CNC equipment in smart factories, specifically a safety door lock system and detection feedback control method for smart factories. Background Technology

[0002] With the widespread use of automated production lines and CNC equipment, the increasing demand for smart (lights-out) factories, and the rigid requirements for safe production, the safe use of production line equipment has become particularly important, and the application of safety door locks is becoming increasingly widespread. Safety door locks are generally installed and applied to the protective doors (barriers) of production line equipment. These protective doors isolate, protect, and form processing areas, while the safety door locks have locking, door opening / closing, and door lock / unlocking detection functions. They are designed and controlled in series with the relevant operation or usage functions of the production line equipment through door interlocking to achieve the purpose of safe use. Most existing ordinary door locks use a split-type bolt design, but this can only be used independently, has limited functionality, and cannot achieve a closed-loop feedback from the bolt detection end. Since the bolt is fixedly installed on the side of the protective door, frequent mechanical movements during use can cause the bolt to loosen or even fall off. A loose bolt not only makes the mechanical bolt operation difficult, but continued use in this state can also damage the door lock itself. When the latch is severely dislodged or detached, operators may choose to bypass the door lock's security restrictions and directly insert the latch into the door lock to meet the signal requirements for the production line equipment's door to be locked, thus creating a false lock. At the same time, unauthorized personnel can also enter the processing area in this dangerous manner, which is extremely inconsistent with the safety production requirements of a smart factory for unattended operation and poses a huge hidden danger to the safe use of the production line equipment. The necessary condition for a door lock to be truly locked is that the latch is in the real and correct physical position.

[0003] To mitigate and resolve such risks, there is an urgent need to design a smart factory-specific security door lock system and method equipped with detection feedback control functions. This system can detect the actual position of the latch, forming a closed-loop feedback mechanism. Only after confirming the correct physical position of the latch on the protective door side and the actual locking of the door can the corresponding production line equipment functions be used. Simultaneously, it can monitor the latch's position status in real time and provide external indications and conditional output functions through corresponding feedback control. Combined with the production line equipment control system, it can also restrict the operation of production line equipment when the door lock is not properly engaged. This invention enhances the reliability of door interlock applications, ensures the safe use of production line equipment, strengthens the security of smart factories, and can promptly repair or adjust the position of the latch in case of abnormal conditions, preventing damage caused by excessive use of the door lock under abnormal conditions. Summary of the Invention

[0004] To address the risks to the safe use of production line equipment caused by the possibility of false locking of door locks, and the problems that existing door lock applications cannot detect, respond to, control the actual physical position of the latch and form a closed loop of detection feedback, this application proposes a smart factory-specific security door lock system and detection feedback control method.

[0005] In a first aspect, the present invention provides a smart factory-specific security door lock system with a detection feedback control function, the system comprising: a door lock body 1, a special-shaped bolt 2, and a proximity switch group 3;

[0006] The door lock body 1 is fixedly installed on the left production line equipment protective door 6 at a preset position; the angle steel seat 4 is welded to the right production line equipment protective door 5 at a preset position, and is used to install the irregular-shaped bolt 2 and the proximity switch group 3.

[0007] Furthermore, the door lock body 1 is equipped with a bolt position detection indicator light 11, a connector 12, a key changeover switch 13, and a lock cylinder 14. The bolt position detection indicator light 11 transmits the light status to the visible outer surface of the door lock body 1 through a light-guiding plastic rod. The connector 12 is located on the bottom surface of the door lock body 1. The key changeover switch 13 has a three-position design, which enables and switches the bolt detection control function. The lock cylinder 14 and the irregular bolt 2 complete the mechanical bolt locking.

[0008] The key changeover switch is used to enable and switch the pin detection control function on the door lock body side; the connector is used to connect the proximity switch and realize the pin position detection signal input; the pin position detection indicator directly reflects whether the pin position status is normal or not.

[0009] Furthermore, the irregular pin 2 is provided with a vertical boss 21 and a horizontal boss 22. The irregular pin 2 is installed and fastened to the angle steel seat 4 using threaded fasteners. The position of the irregular pin 2 corresponds to the lock head 14.

[0010] The angle steel base 4 is provided with vertical lugs 41 and horizontal lugs 42 respectively corresponding to the vertical boss 21 and the horizontal boss 22; the vertical proximity switch 31 is installed on the vertical lug 41 to detect the vertical boss 21, and the horizontal proximity switch 32 is installed on the horizontal lug 42 to detect the horizontal boss 22.

[0011] Furthermore, the door lock body 1 is equipped with a proximity switch group control relay, a bolt position normal detection relay, a bolt disengagement detection relay, a control intermediate relay, and an electromagnet push rod mechanism.

[0012] The proximity switch group control relay is used for the control output of the proximity switch group detection signal, and includes a set of normally open and normally closed contacts; the latch position normal state detection relay is used for the feedback output of the safety door lock system based on the contact switching signal output by the proximity switch group control relay for latch position detection under normal conditions, and also includes a set of normally open and normally closed contacts; the latch disengagement detection relay is used to detect whether the latch is disengaged based on the contact switching signal output by the proximity switch group control relay; the electromagnet push rod mechanism controls the push rod to move downward and limit it through the electromagnet push rod control circuit, and can independently maintain the contact position of the door lock body door switch contact group.

[0013] Secondly, the present invention also provides a detection feedback control method for a smart factory-specific security door lock system, which is applied to the system in which the electrical control circuit inside the door lock body includes a proximity switch group control circuit, a bolt position normal detection control circuit, a bolt disengagement detection control circuit, and an electromagnet push rod control circuit.

[0014] The method includes:

[0015] The key switch activates and switches the latch detection control function on the door lock body. When the proximity switch group detects an abnormal latch position, the primary latch detection control function in position I provides an abnormal latch position indicator light and contact conditions for the normal detection relay output through the latch position normal detection control circuit. The secondary latch detection control function in position II, through the latch position normal detection control circuit, latch dislocation detection control circuit, and electromagnet push rod control circuit, not only has the function of position I, but can also directly output a response from the door lock body and directly restrict the operation of production line equipment when the latch is severely dislocated.

[0016] Furthermore, in the proximity switch group control circuit:

[0017] Each proximity switch in the proximity switch group is an inductive three-wire PNP normally open type. Each control relay in the proximity switch group is electrically controlled and wired in this manner. When the vertical position proximity switch 31 detects that the irregular pin 2 is in the correct vertical position, it controls the coil of the vertical position proximity switch control relay 15 to be energized, and the normally open contact 151 of KA1 closes. Otherwise, it remains open. When the horizontal position proximity switch 32 detects that the irregular pin 2 is in the correct horizontal position, it controls the coil of the horizontal position proximity switch control relay 16 to be energized, and the normally open contact 161 of KA2 closes. Otherwise, it remains open.

[0018] Furthermore, in the normal detection and control loop of the latch position:

[0019] The two contacts at the fully open positions of key changeover switch 13 (positions I and II) are connected in series with the normally open contacts 151 of KA1 and 161 of KA2 and the control coil of the pin position normal detection relay 17. The control coil of the pin position normal detection relay 17 is connected in parallel with the pin position detection indicator light 11.

[0020] The control process of the normal detection control circuit for the pin position is as follows: When the contact group of the key changeover switch 13 is in the fully open position of position I and position II, the control pin position detection indicator 11 will light up and the coil of the normal detection relay 17 will be energized only when both the normally open contact 151 of KA1 and the normally open contact 161 of KA2 are closed; otherwise, the controlled indicator 11 will be off and the controlled coil will be de-energized. When the coil of the normal detection relay 17 is energized, the normally closed contact 172 of KA will open; when de-energized, the normally closed contact 172 of KA will close.

[0021] Furthermore, in the pin dislodgement detection control loop:

[0022] When the key changeover switch 13 is in the II position only, the two contacts are connected in series with the normally open contact 151 of KA1 and the control coil of the pin disengagement detection relay 18, and the normally open contact 161 of KA2 is connected in parallel with the normally open contact 151 of KA1.

[0023] The control process of the pin disengagement detection control circuit is as follows: When the key changeover switch 13 is in the II position, and at least one of the normally open contacts KA1 151 and KA2 161 is closed, the coil of the control pin disengagement detection relay 18 is energized; the coil of the pin disengagement detection relay 18 is not energized only when both normally open contacts KA1 151 and KA2 161 remain open; when the coil of the pin disengagement detection relay 18 is energized, the normally closed contact KA3 182 is opened; when de-energized, the normally closed contact KA3 182 is closed.

[0024] Furthermore, the door lock body 1 contains a mechanical push rod 111 and a door switch contact group 112. An electromagnet push rod 110 is installed on the right side of the mechanical push rod 111, and the mechanical action is completed by the spring contact 1121 on the horizontally extended door switch contact group 112.

[0025] When the electromagnet push rod 110 is energized, it can independently press the spring contact 1121 to keep the door switch contact group 112 in the door open detection state; when the electromagnet is de-energized, it resets itself by its own spring force, and the spring contact 1121 is still controlled by the door lock body mechanical push rod 111 alone.

[0026] Furthermore, in the electromagnet push rod control circuit:

[0027] When the key changeover switch 13 is in the II position only, the two contacts are connected in series with the normally closed contact 182 of KA3, the control coil of the intermediate relay 19, and the control coil of the electromagnet push rod 110. The normally closed contact 172 of KA is connected in series with the normally open contact 191 of KA4 and is connected in parallel with the two ends of the normally closed contact 182 of KA3.

[0028] The control process of the electromagnet push rod control circuit is as follows: When the key changeover switch 13 is in the II position, it can only be turned on when it is in the II position; when the normally closed contact 182 of KA3 is kept closed, the electromagnet push rod 110 is energized, and at the same time the intermediate relay 19 is energized and controls the normally open contact 191 of KA4 to close; at this time, the circuit is self-locked by the normally closed contact 172 of KA connected in series with it, and the electromagnet push rod 19 is not energized only when the normally closed contact 172 of KA is opened.

[0029] The beneficial effects of this application are as follows: 1) The overall design is reasonable, ingenious, and compact, allowing for adaptive upgrades to most ordinary door locks used in existing production line equipment. 2) The application of the key changeover switch's position and the corresponding electrical control circuit design enable users to selectively enable and switch different pin detection control functions according to their needs, ensuring differentiated and diversified use in different scenarios or requirements. 3) The access control design of the key changeover switch ensures that the pin detection control function can only be opened, switched, or closed by authorized personnel, preventing unauthorized interference and ensuring the security and reliability of this function. 4) The direct connection between the proximity switch group and the door lock body creates a closed-loop security door lock system and forms the shortest wiring. 5) The installation and positioning of the proximity switch group on the protective door side of the production line equipment with irregularly shaped pins ensure the authenticity and accuracy of the physical position detection of the pins. 6) The double-protrusion irregular design of the latch, combined with the use of proximity switches, can limit the provision of false locking signals and the possibility of human interference to a certain extent, avoiding interference from external conditions. Furthermore, the detection distance, position settings, and corresponding detection signal output combinations of the two proximity switches can be used to determine whether the latch's position is generally abnormal or severely disengaged. 7) The application of the latch position detection indicator light facilitates direct monitoring of the latch's position status. Attached Figure Description

[0030] Figure 1 This image illustrates the application of a safety door lock system to sliding protective doors on production line equipment.

[0031] Figure 2 A frontal isometric view of the door lock body of a security door lock system;

[0032] Figure 3 A schematic diagram illustrating the application of a special-shaped latch and proximity switch assembly in a security door lock system.

[0033] Figure 4 Electrical wiring diagram of the proximity switch group control relay circuit for a safety door lock system Figure 1 ;

[0034] Figure 5 Electrical wiring diagram of the proximity switch group control relay circuit for a safety door lock system Figure 2 ;

[0035] Figure 6 A schematic diagram of the electrical principle of the normal detection and control circuit for the pin position of a security door lock system;

[0036] Figure 7 A schematic diagram of the electrical principle of the bolt disengagement detection control circuit for a security door lock system;

[0037] Figure 8 A schematic diagram of the electrical principle of the electromagnet push rod control circuit for a security door lock system;

[0038] Figure 9 A schematic diagram of the electromagnet push rod mechanism and its application in a security door lock system;

[0039] Figure 10 A schematic diagram of the operation process of a security door lock system;

[0040] The numbers in the diagram are explained as follows: 1. Door lock body; 2. Irregularly shaped bolt; 3. Proximity switch group; 4. Angle steel base; 5. Right side production line equipment protection door; 6. Left side production line equipment protection door; 11. Bolt position detection indicator light; 12. Connector socket; 13. Key changeover switch; 14. Lock head; 15. Vertical position proximity switch control relay; 151KA1 normally open contact; 16. Horizontal position proximity switch control relay; 161KA2 normally open contact; 17. Bolt position normal detection relay; 172KA normally closed contact; 18. Bolt disengagement detection relay; 182KA3 normally closed contact; 19. Intermediate relay; 191KA4 normally open contact; 110. Electromagnet push rod; 111. Mechanical push rod; 112. Door switch contact group; 1121. Spring contact; 21. Vertical position boss; 22. Horizontal position boss; 31. Vertical position proximity switch; 32. Horizontal position proximity switch; 41. Vertical position lug; 42. Horizontal position lug. Detailed Implementation

[0041] The present application will be further described in detail below with reference to the accompanying drawings of the embodiments.

[0042] This invention provides a smart factory-specific security door lock system and method. Through the classification and application of detection and control functions, as well as the specific design and detection judgment of the actual physical position of the latch, and corresponding feedback control, it provides external indication and conditional output functions. It can also be integrated with the production line equipment control system to directly output responses, forming a closed loop. The security door lock system consists of a door lock body, a non-standard latch, and a proximity switch group. The door lock body, including the door lock housing and latch head, adopts a universal design and is equipped with a key changeover switch, two keyholes, and a latch position detection indicator light. Internally, it includes a proximity switch group control relay, a latch position normal detection relay, a latch disengagement detection relay, a control intermediate relay, and an electromagnet push rod mechanism, with corresponding electrical control circuits designed and configured. The key changeover switch is used to enable and switch the bolt detection control function on the door lock body side; the connector is used to connect the proximity switch and realize the input of the bolt position detection signal; the bolt position detection indicator light can directly reflect whether the bolt position status is normal or not on the visible surface of the door lock body; the electrical control circuit set inside the door lock body includes a proximity switch group control relay circuit, a bolt position normal detection control circuit, a bolt disengagement detection control circuit, and an electromagnet push rod control circuit; the proximity switch group control relay is used for the control output of the proximity switch group detection signal, and includes a set of normally open and normally closed contacts; the bolt position normal detection relay is used for the feedback output of the safety door lock system based on the contact switch signal output by the proximity switch group control relay under normal conditions, and also includes a set of normally open and normally closed contacts; the bolt disengagement detection relay is used for the detection output of the bolt disengagement based on the contact switch signal output by the proximity switch group control relay; the electromagnet push rod mechanism controls the push rod to move downward and limit it through the electromagnet push rod control circuit, and can independently maintain the contact position of the door switch contact group of the door lock body. The irregularly shaped latch has two protrusions at different positions, directions, and heights on the latch body. These protrusions work in conjunction with a proximity switch assembly to detect the latch's position, ensuring the proximity switches are installed and positioned correctly without affecting the mechanical latch. The proximity switch assembly consists of two inductive three-wire PNP normally open proximity switches used to detect the latch's position in different directions. The detection signal is transmitted through the proximity switch assembly to a relay, which outputs the signal to the relevant electrical control circuit inside the door lock body.

[0043] Example 1

[0044] A smart factory-specific security door lock system and method with detection feedback control function is disclosed. The door lock body and irregularly shaped bolts are adaptively fitted and fixed to the protective door of the production line equipment in appropriate positions according to the opening form (hinged or sliding). This invention preferably uses a sliding type. Two proximity switches of the proximity switch group are installed and fixed on the side of the protective door (angle steel base) where the irregularly shaped bolt is located. Through reasonable arrangement, the designed protrusions of the irregularly shaped bolt are detected to reflect the actual physical position of the bolt. Their cable plugs are respectively connected to the corresponding connectors on the door lock body. When the irregularly shaped bolt is incorrectly positioned in both directions, it is considered that the bolt is dislodged; a bolt falling off indicates a severe dislodged bolt. When both are correct, the bolt position is considered normal. When only one position is incorrect, it can be considered equivalent to a loose bolt. When at least one position is incorrect, it is considered that the bolt position is abnormal.

[0045] When in use, the security door lock system is powered on, and the proximity switch group detects the actual physical position of the latch in real time and controls the relay output through the proximity switch group. With the key changeover switch in the 0 position, the latch detection control function is disabled, and all other basic functions of the security door lock system can be used normally. With the key changeover switch in the 1 position, the primary latch detection control function is enabled. At this time, the latch position normal detection control circuit controls the latch position detection indicator light and the latch position normal detection relay output. When the latch position is normal, the indicator light illuminates and the normal detection relay coil is energized; conversely, when the latch position is abnormal, the indicator light goes out and the normal detection relay coil is de-energized. The open / closed state of the contacts output by the normal detection relay can be used as input conditions and connected in series or combined with the relevant contact switch signals of the door lock body for door interlocking design. Soft control is applied to the safety operation functions of production line equipment; for example, it can prompt abnormal latch position and restrict related functions through the equipment's CNC system. When the key changeover switch is in position II, the primary pin detection control function is maintained and the secondary pin detection control function is enabled. The pin disengagement detection control circuit controls the output of the pin disengagement detection relay. When the pin is severely disengaged, neither the relay controlled by the proximity switch group nor the pin disengagement detection relay is energized. The electromagnet push rod control circuit controls the electromagnet push rod to move downward and act on the spring contact of the door lock body door switch contact group. That is, the electromagnet push rod is energized and moves downward rapidly by a distance δ, pressing the spring contact and maintaining its mechanical position. This ensures that the switch signals of each contact of the door switch contact group are immediately maintained in the open state. At the same time, the basic functions of the safety door lock and the corresponding door machine interlock design are used to hard control the safe use function of the production line equipment. That is, the door lock body itself outputs a response related to the door open state and restricts the corresponding function. When the pin position returns to normal, the electromagnet push rod is de-energized and resets by its own spring force. The spring contact of the door switch contact group is then controlled independently by the original mechanical push rod mechanism of the door lock body. The safety door lock system is used under the condition that the pin position is normal.

[0046] When the proximity switch group detects an abnormal latch position, position I provides an indicator light and the contact conditions or control of the normal detection relay output. Position II, in addition to the functions of position I, can also directly output a response and restrict use when the latch is severely dislodged, without interfering with the basic control functions of the door lock, by maintaining the door switch contact group and the door open state. In position II, if the latch is severely dislodged and no mechanical maintenance or adjustment is performed to restore its normal position, the safety door lock system will remain in the open state to restrict the operation of production line equipment. The open state is the highest priority condition for restricting use when the safety door lock is used in door interlocking applications, thus ensuring the specific targeting and reliability of the response control.

[0047] Example 2

[0048] A smart factory-specific safety door lock system and method with detection feedback control function is disclosed. The safety door lock system consists of a door lock body 1, a non-standard bolt 2, a proximity switch group 3, and related accessories. The door lock body 1 is equipped with a bolt position detection indicator light 11, a horizontal connector 12, and a key changeover switch 13. Internally, it is equipped with a vertical position proximity switch control relay 15, a horizontal position proximity switch control relay 16, a bolt position normal detection relay 17, a bolt disengagement detection relay 18, an intermediate relay 19, and an electromagnet push rod 110 mechanism, and corresponding electrical control circuits are designed and configured for related function control. The door lock body 1 and the non-standard bolt 2 are adapted to the opening form of the protective door of the production line equipment and are fixed in appropriate positions. Each proximity switch in the proximity switch group 3 is installed and fixed on the side angle steel base 4 of the protective door where the non-standard bolt 2 is located. Through reasonable arrangement, the design protrusions of the non-standard bolt 2 are detected to reflect the actual physical position of the bolt. The cable plugs are respectively connected to the horizontal connectors 12 of the door lock body 1. The electrical control circuit inside the door lock body 1 includes a proximity switch group control relay circuit, a bolt position normal detection control circuit, a bolt disengagement detection control circuit, and an electromagnet push rod control circuit.

[0049] By specifically designing and testing the actual physical location of the latch, and combining the judgment and application process, the necessary conditions for the actual locking of the security door lock system were mastered.

[0050] By employing diverse options for combining and applying detection signals, different closed-loop control effects are achieved, making it convenient for users to implement solutions based on specific production needs.

[0051] Depending on its installation method, possible direction of movement, and amount of movement, the irregularly shaped pin 2 can be processed or fitted with a vertical boss 21 and a horizontal boss 22 to cooperate with the proximity switch group 3 to detect its position. This can limit the provision of false locking signals and the possibility of human shielding, and avoid interference from external conditions.

[0052] The proximity switch group 3 includes a vertical proximity switch 31 and a horizontal proximity switch 32, which are adapted to fit the vertical lug 41 and horizontal lug 42 of the angle steel seat 4 welded to the protective door 5 of the production line equipment on the right side, respectively. The accuracy and authenticity of the detection of the physical position of the irregularly shaped pin 2 are ensured through appropriate selection and installation location settings. This preferred embodiment uses an inductive three-wire PNP normally open type.

[0053] The combined design and application facilitates rapid and reasonable position adjustment based on different sensor parameters to achieve accurate detection.

[0054] The combined application of the irregularly shaped pin 2 and the proximity switch group 3 can determine whether the position status of the irregularly shaped pin 2 is generally abnormal or severely disengaged based on the corresponding detection signal output combination.

[0055] The latch position detection indicator light 11 installed on the door lock body 1 is controlled by the latch position normal detection control circuit. Its light display status on the visible outer surface of the door lock body 1 makes it easy to directly inspect and grasp the position status of the irregularly shaped latch 2. In this preferred embodiment, a green LED indicator light is used.

[0056] The key changeover switch 13 set in the door lock body 1 and the corresponding electrical control circuit design allow users to selectively enable and switch different latch detection control functions according to their needs, ensuring differentiated and diversified applications and wide use in different scenarios or requirements.

[0057] The access control design of the key changeover switch 13 on the door lock body 1 ensures that the bolt detection control function can only be opened, switched or closed by authorized personnel, so that the application of the bolt detection control function will not be interfered with by other unauthorized personnel, thus ensuring the security and reliability of the function.

[0058] The latch detection and control function includes primary and secondary latch detection and control functions. When the proximity switch group 3 detects an abnormal position of the irregular latch 2, position I provides the latch position detection indicator 11 and the contact conditions or control output by the latch position normal detection relay 17. Position II, in addition to the functions of position I, can also directly output a response and restrict the operation of production line equipment when the irregular latch 2 is severely dislodged, without interfering with the basic control functions of the door lock, by maintaining the door switch contact group 112 in the open state. For severe latch dislodgment in position II, if no mechanical maintenance and adjustment are performed to restore the position of the irregular latch 2 to normal, the safety door lock system will always be in the open state application mode. The open state is the highest priority condition for restricting the use of the safety door lock when the door machine is interlocked, thus ensuring the specificity and reliability of the response control.

[0059] The electromagnet push rod 110 of the door lock body 1 is fixedly installed inside the door lock body 1. It completes its mechanical action through the lateral extension of the spring contact 1121 and has a certain travel limit. When the electromagnet is energized, the electromagnet push rod 110 can independently press the spring contact 1121 to put the door switch contact group 112 into and maintain the door open detection state; when the electromagnet is de-energized, the electromagnet push rod 110 resets by its own spring force.

[0060] Whether the electromagnet 110 in the door lock body 1 is energized is controlled by the electromagnet push rod control circuit. The design of the electromagnet push rod control circuit has a certain circuit self-locking function, which ensures that the electromagnet 110 is energized when neither the vertical position proximity switch control relay 15 nor the horizontal position proximity switch control relay 16 is energized; and the electromagnet 110 is de-energized when both the vertical position proximity switch control relay 15 and the horizontal position proximity switch control relay 16 are energized.

[0061] The normal position detection control circuit of the pin uses a series design of the proximity switch group 3 signal, and only uses the closing of the normally open contact of the normal position detection relay 17 as the correct position detection signal, thus ensuring reliability.

[0062] The pin dislocation detection control circuit uses a parallel design of proximity switch group 3 signals, and only uses the normally open contact of pin dislocation detection relay 18 to keep open as the severe dislocation detection signal, thus ensuring reliability.

[0063] Example 3

[0064] See appendix Figure 1 A smart factory-specific safety door lock system with detection feedback control function consists of a door lock body 1, a special-shaped bolt 2, a proximity switch group 3, and related accessories. The illustrated production line equipment protective door is a push-pull type. The left-side production line equipment protective door 6 is fixed or rigidly connected to the production line equipment, while the right-side production line equipment protective door 5 slides horizontally in the left-right direction. The door lock body 1 and the special-shaped bolt 2 are both adaptively assembled and fixed to the protective door in appropriate positions. The door lock body 1 is fixedly installed at a certain position on the left-side production line equipment protective door 6; the angle steel base 4 is welded to a certain position on the right-side production line equipment protective door 5 for installing the special-shaped bolt 2 and the proximity switch group 3.

[0065] See appendix Figure 2The door lock body 1 is equipped with a bolt position detection indicator light 11, a connecting bolt socket 12, and a key changeover switch 13. The bolt position detection indicator light 11 is a green LED indicator light, which transmits the light status to the visible outer surface of the door lock body 1 through a light-guiding plastic rod. The connecting bolt socket 12 is located on the bottom surface of the door lock body 1 to avoid excessive interference with the moving door during electrical connection. The key changeover switch 13 has a three-position design, which enables and switches the bolt detection control function. The lock cylinder 14 and the irregularly shaped bolt 2 complete the mechanical bolt locking.

[0066] See appendix Figure 3 The irregularly shaped pin 2 is machined or assembled with a vertical boss 21 and a horizontal boss 22, and is fastened to the angle steel base 4 using threaded fasteners. Its position corresponds to the lock head 14. The angle steel base 4 is provided with a vertical lug 41 and a horizontal lug 42 at a certain position. A vertical proximity switch 31 is installed on the vertical lug 41 to detect the vertical boss 21, and a horizontal proximity switch 32 is installed on the horizontal lug 42 to detect the horizontal boss 22. The design of the double bosses must take into account the installation method, possible direction of movement, and amount of movement of the irregularly shaped pin 2. In addition, the detection distance and area of ​​the proximity switch must be considered to adapt and select the corresponding proximity switch. In application, the components are assembled and fixed in an adaptive manner.

[0067] See appendix Figure 4 and Figure 5 Each proximity switch in the proximity switch group is an inductive three-wire PNP normally open type. All control relays in the proximity switch group are electrically controlled and wired accordingly. The power supply is a direct 24V DC branch from the safety door lock system. When the vertical position proximity switch 31 detects that the irregularly shaped pin 2 is in the correct vertical position, it energizes the coil of the vertical position proximity switch control relay 15, closing the normally open contact 151 of KA1; otherwise, it remains open. When the horizontal position proximity switch 32 detects that the irregularly shaped pin 2 is in the correct horizontal position, it energizes the coil of the horizontal position proximity switch control relay 16, closing the normally open contact 161 of KA2; otherwise, it remains open.

[0068] See appendix Figure 6The two contacts at the fully open positions (I and II) of the key changer switch 13 are connected in series with the normally open contacts KA1 (151), KA2 (161), and the control coil of the pin position normal detection relay 17. The control coil of the pin position normal detection relay 17 is connected in parallel with the pin position detection indicator light 11. The control process of the pin position normal detection control circuit is as follows: When the contact group of the key changer switch 13 is in the fully open position (I and II), it is connected. Only when both normally open contacts KA1 (151) and KA2 (161) are closed will the green LED of the pin position detection indicator light 11 light up and the coil of the pin position normal detection relay 17 be energized; otherwise, the controlled LED will be off and the controlled coil will be de-energized. When the coil of the pin position normal detection relay 17 is energized, the normally closed contact KA1 (172) opens; when de-energized, the normally closed contact KA1 (172) closes.

[0069] See appendix Figure 7 The two contacts of the key changeover switch 13 in the II-only ON position are connected in series with the normally open contact 151 of KA1 and the control coil of the pin disengagement detection relay 18. The normally open contact 161 of KA2 is connected in parallel with the normally open contact 151 of KA1. The control process of the pin disengagement detection control circuit is as follows: When the contact group of the key changeover switch 13 is in the II-only ON position, it can only be connected when it is in the II-only position; when at least one of the normally open contacts 151 of KA1 and 161 of KA2 is closed, the coil of the control pin disengagement detection relay 18 is energized; only when both normally open contacts 151 of KA1 and 161 of KA2 remain open can the coil of the pin disengagement detection relay 18 be de-energized (de-energized). When the coil of the pin disengagement detection relay 18 is energized, the normally closed contact 182 of KA3 opens; when de-energized, the normally closed contact 182 of KA3 closes.

[0070] See appendix Figure 8 When the key switch 13 is in the II position (only ON), its two contacts are connected in series with the normally closed contact 182 of KA3, the control coil of the intermediate relay 19, and the control coil of the electromagnet push rod 110. The normally closed contact 172 of KA and the normally open contact 191 of KA4 are connected in series and in parallel with the two ends of the normally closed contact 182 of KA3. The control process of the electromagnet push rod control circuit is as follows: When the key switch 13's wiring contact group is in the II position (ON), it can only be energized when it is in the II position. When the normally closed contact 182 of KA3 remains closed, the electromagnet of the control electromagnet push rod 110 is energized, and at the same time, the intermediate relay 19 is energized and controls the normally open contact 191 of KA4 to close. At this time, the circuit is self-locked by the series connection of the normally closed contact 172 of KA. Only when the normally closed contact 172 of KA is open is the electromagnet of the control electromagnet push rod 19 de-energized.

[0071] See appendix Figure 9The dashed box on the left shows the basic door switch contact group control mechanism and its travel within the door lock body 1, including the mechanical push rod 111 and the door switch contact group 112. At this time, the mechanical push rod 111 presses against the spring contact 1121, causing the door switch contact group 112 to be in the door open detection state, that is, outputting the corresponding contact switch signal. The mechanical push rod 111 and the spring contact 1121 are both in the lower limit or lowest position in the vertical direction. If the mechanical push rod 111 moves up to the upper limit position by mechanical action, the spring contact 1121 is completely released and returns to its original position (reset), and the door switch contact group 112 is in the door closed detection state. On the right is an electromagnet push rod 110 designed and installed in a suitable position. It can complete mechanical action by laterally extending the spring contact 1121. Its stroke limit is δ. Referring to the door switch contact group control mechanism design, when the electromagnet of the electromagnet push rod 110 is energized, the electromagnet push rod 110 can independently press the spring contact 1121 to put the door switch contact group 112 into and maintain the door open detection state; when the electromagnet of the electromagnet push rod 110 is de-energized, the electromagnet push rod 110 resets by its own spring force, and the spring contact 1121 is still controlled by the door lock body mechanical push rod 111 alone.

[0072] See appendix Figure 10 The safety door lock system operates according to this process, detecting the combination of switch signals and sending them to the electrical control side. Depending on the different functional applications and different detection states, the signals are processed by the control loop and fed back to the safety electrical hard-wired circuit or control system side of the production line equipment as needed. The system then provides certain response control or restrictions on the operation and use of the production line equipment.

[0073] This invention provides a smart factory-specific security door lock system and method with a detection feedback control function. Through the classification and application of detection control functions, as well as the specific design and detection judgment of the actual physical position of the latch, and by providing external indication and conditional output functions through corresponding feedback control, it can also directly output responses in conjunction with the control system of production line equipment, forming a closed loop. The security door lock system consists of a door lock body, a non-standard latch, and a proximity switch group. The door lock body is equipped with a key changeover switch, two connectors, and a latch position detection indicator light. Internally, it includes a proximity switch group control relay, a latch position normal detection relay, a latch disengagement detection relay, a control intermediate relay, and an electromagnet push rod mechanism, and is designed and configured with corresponding electrical control circuits for related feedback control functions. The non-standard latch has two protrusions at different positions, directions, and heights on the latch body to cooperate with the proximity switch group to detect the latch position. The proximity switch group includes two proximity switches of the same model used to detect the position status of the latch in different directions, and their cable plugs are respectively connected to the connectors of the door lock body. The door lock body and irregularly shaped bolt are adapted and fixed to the protective door (fence) of the production line equipment according to its opening method (hinged or sliding). The two proximity switches of the proximity switch group are installed and fixed on the protective door side where the irregularly shaped bolt is located, and the actual physical position of the bolt is detected through reasonable arrangement. This application has a reasonable design and compact structure. The bolt detection control function on the door lock body side is activated and switched by the key changeover switch. When the proximity switch group detects that the bolt position is abnormal, the primary bolt detection control function of position I provides an abnormal bolt position indicator light and contact conditions or control of the normal detection relay output. It can be connected in series or combined with the door interlock function of the safety door lock system, or it can be directly used in the safety electrical hard control circuit of the production line equipment. The secondary bolt detection control function of position II, in addition to the function of position I, can also directly control the door lock body to output a response and directly restrict the operation of the production line equipment when the bolt is seriously dislodged.

[0074] This security door lock system is designed with two bolt detection and control function modes. By detecting whether the actual physical position of the bolt is correct, it directly reflects whether the door lock is in a truly lockable state. It can output prompts, feedback and control based on the abnormal state of the bolt and act on the door interlock, ensuring the authenticity of the door lock locking condition. This enhances the reliability of the door interlock application and the safety of production line equipment, ensuring the safe operation of the smart factory when it is unattended.

Claims

1. A smart factory-specific security door lock system, characterized in that, The system includes: a door lock body (1), a special-shaped bolt (2), and a proximity switch group (3); The door lock body (1) is fixedly installed on the left production line equipment protection door (6) at a preset position; the angle steel seat (4) is welded to the right production line equipment protection door (5) at a preset position for installing the irregular pin (2) and the proximity switch group (3). The door lock body (1) is equipped with a bolt position detection indicator light (11), a connector socket (12), a key changeover switch (13), and a lock cylinder (14). The bolt position detection indicator light (11) transmits the light display status to the visible outer surface of the door lock body (1) through a light guide plastic rod. The connector socket (12) is located on the bottom surface of the door lock body (1). The key changeover switch (13) has a three-position design. It enables and switches the bolt detection control function, and the lock cylinder (14) and the irregular bolt (2) complete the mechanical bolt locking. The key changeover switch is used to enable and switch the pin detection control function on the door lock body side; the connector is used to connect the proximity switch and realize the pin position detection signal input; the pin position detection indicator directly reflects whether the pin position status is normal or not. The irregular pin (2) is provided with a vertical boss (21) and a horizontal boss (22). The irregular pin (2) is installed and fastened to the angle steel seat (4) using threaded fasteners. The position of the irregular pin (2) corresponds to the lock head (14). A vertical lug (41) and a horizontal lug (42) are respectively provided on the angle steel base (4) at the vertical boss (21) and the horizontal boss (22); a vertical proximity switch (31) is installed on the vertical lug (41) to detect the vertical boss (21), and a horizontal proximity switch (32) is installed on the horizontal lug (42) to detect the horizontal boss (22).

2. The smart factory-specific security door lock system according to claim 1, characterized in that, The door lock body (1) is equipped with a proximity switch group control relay, a normal position detection relay for the latch, a latch disengagement detection relay, an intermediate control relay, and an electromagnet push rod mechanism. The proximity switch group control relay is used for the control output of the proximity switch group detection signal, and includes a set of normally open and normally closed contacts; the latch position normal state detection relay is used for the feedback output of the safety door lock system based on the contact switching signal output by the proximity switch group control relay for latch position detection under normal conditions, and also includes a set of normally open and normally closed contacts; the latch disengagement detection relay is used to detect whether the latch is disengaged based on the contact switching signal output by the proximity switch group control relay; the electromagnet push rod mechanism controls the push rod to move downward and limit it through the electromagnet push rod control circuit, and can independently maintain the contact position of the door lock body door switch contact group.

3. A detection feedback control method for a smart factory-specific security door lock system, characterized in that, In the system applied to any one of claims 1-2, the electrical control circuit provided inside the door lock body includes a proximity switch group control circuit, a bolt position normal detection control circuit, a bolt disengagement detection control circuit, and an electromagnet push rod control circuit. The method includes: The key switch activates and switches the latch detection control function on the door lock body. When the proximity switch group detects an abnormal latch position, the primary latch detection control function in position I provides an abnormal latch position indicator light and contact conditions for the normal detection relay output through the latch position normal detection control circuit. The secondary latch detection control function in position II, through the latch position normal detection control circuit, latch dislocation detection control circuit, and electromagnet push rod control circuit, not only has the function of position I, but can also directly output a response from the door lock body and directly restrict the operation of production line equipment when the latch is severely dislocated.

4. The detection feedback control method for a smart factory-specific security door lock system according to claim 3, characterized in that, In the proximity switch group control circuit: Each proximity switch in the proximity switch group is an inductive three-wire PNP normally open type. Each control relay in the proximity switch group is electrically controlled and wired in this manner. When the vertical position proximity switch (31) detects that the vertical position of the irregular pin (2) is correct, it controls the coil of the vertical position proximity switch control relay (15) to be energized, and the normally open contact (151) of KA1 is closed. Otherwise, it remains open. When the horizontal position proximity switch (32) detects that the horizontal position of the irregular pin (2) is correct, it controls the coil of the horizontal position proximity switch control relay (16) to be energized, and the normally open contact (161) of KA2 is closed. Otherwise, it remains open.

5. The detection feedback control method for a smart factory-specific security door lock system according to claim 4, characterized in that, In the normal detection and control loop of the pin position: The two contacts at the fully open positions of the key changeover switch (13) I and II are connected in series with the normally open contacts of KA1 (151), KA2 (161) and the control coil of the pin position normal detection relay (17). The control coil of the pin position normal detection relay (17) is connected in parallel with the pin position detection indicator (11). The control process of the normal detection control circuit for the pin position is as follows: When the key changeover switch (13) is in the fully open position of position I and position II, the control pin position detection indicator (11) will light up and the coil of the pin position normal detection relay (17) will be energized only when both the normally open contact (151) of KA1 and the normally open contact (161) of KA2 are closed. Otherwise, the controlled indicator (11) will be extinguished and the controlled coil will be de-energized. When the coil of the pin position normal detection relay (17) is energized, the normally closed contact (172) of KA will open. When de-energized, the normally closed contact (172) of KA will close.

6. The detection feedback control method for a smart factory-specific security door lock system according to claim 5, characterized in that, In the pin dislodgement detection control circuit: The two contacts of the key changeover switch (13) in the only II position are connected in series with the normally open contact (151) of KA1 and the control coil of the pin disengagement detection relay (18), and the normally open contact (161) of KA2 is connected in parallel with the normally open contact (151) of KA1; The control process of the pin disengagement detection control circuit is as follows: When the key changeover switch (13) is in the II position, and at least one of the normally open contacts (151) of KA1 and (161) of KA2 is closed, the coil of the control pin disengagement detection relay (18) is energized; the coil of the pin disengagement detection relay (18) is not energized only when both the normally open contacts (151) of KA1 and (161) of KA2 remain open; when the coil of the pin disengagement detection relay (18) is energized, the normally closed contact (182) of KA3 is opened; when de-energized, the normally closed contact (182) of KA3 is closed.

7. The detection feedback control method for a smart factory-specific security door lock system according to claim 6, characterized in that, The door lock body (1) contains a mechanical push rod (111) and a door switch contact group (112). An electromagnet push rod (110) is installed on the right side of the mechanical push rod (111). The mechanical action is completed by the spring contact (1121) on the horizontally extended door switch contact group (112). When the electromagnet is energized, the electromagnet push rod (110) can independently press the spring contact (1121) to put the door switch contact group (112) into and maintain the door open detection state; when the electromagnet is de-energized, the electromagnet push rod (110) resets by its own spring force, and the spring contact (1121) is still controlled by the door lock body mechanical push rod (111) alone.

8. The detection feedback control method for a smart factory-specific security door lock system according to claim 7, characterized in that, In the control circuit of the electromagnet push rod: The two contacts of the key changeover switch (13) in the II position only are connected in series with the normally closed contact (182) of KA3, the control coil of the intermediate relay (19) and the control coil of the electromagnet push rod (110). The normally closed contact (172) of KA is connected in series with the normally open contact (191) of KA4 and is connected in parallel with the two ends of the normally closed contact (182) of KA3. The control process of the electromagnet push rod control circuit is as follows: The key change switch (13) wiring contact group is in the II position on position, and it can only be connected when it is in the II position; when the KA3 normally closed contact (182) is kept closed, the electromagnet of the control electromagnet push rod (110) is energized, and at the same time the intermediate relay (19) is energized and controls the KA4 normally open contact (191) to close; at this time, the circuit is self-locked by the KA normally closed contact (172) connected in series with it, and the electromagnet of the control electromagnet push rod (19) is not energized only when the KA normally closed contact (172) is opened.

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