Flexible clamp airtightness detection and control system based on electrical interlocking

Abstract

This invention relates to the field of automated control technology for machining, and discloses a flexible fixture airtightness detection and control system based on electrical interlocking. The flexible fixture airtightness detection and control system based on electrical interlocking includes at least a gas detection button branch, a gas pressure sensor branch, a flashing controller branch, a first time relay branch, a machine tool association branch, a second time relay branch, an alarm light branch, a gas detection valve branch, and an airtightness detection status light branch. All these branches are connected in parallel across the two ends of the power supply. This invention provides at least one airtightness detection and control system that employs hardware electrical interlocking without relying on software control, has a complete delay and timeout protection mechanism, uses a flashing alarm method, can use a low-voltage safe power supply, provides clear status indication, is easy to maintain, and has strong versatility.

Description

Technical Field

[0001] This invention relates to the field of automated control technology for machining, and in particular to a flexible fixture airtightness detection and control system based on electrical interlocking. Background Technology

[0002] In the machining industry, the positioning accuracy of workpiece clamping directly affects the machining quality and product qualification rate.

[0003] Currently, the commonly used methods for airtightness testing of fixtures in factories mainly include three types: manual visual pressure gauge testing, PLC software-controlled testing, and simple pneumatic testing. Manual visual testing relies entirely on the operator's experience and sense of responsibility. Testing standards are inconsistent, and there is no automatic interlocking function. The machine tool can still start even when a product fails the test, easily leading to fatigue and negligence, resulting in defective products being released. While PLC software-controlled testing offers a high degree of automation, it depends on the software program. When the PLC malfunctions or the program malfunctions, the interlocking function may fail. After a power outage and restart, the system needs to be reinitialized, creating a safety window. Furthermore, it requires professional programmers for maintenance, resulting in high costs. Simple pneumatic testing lacks a time-delay protection mechanism, testing immediately after the air valve opens. When the air pressure is not stable, misjudgments are easily made. It also lacks timeout protection, has a limited alarm method (usually just a constantly lit indicator light), and the control voltage is mostly 220V AC, posing a risk of electric shock.

[0004] In summary, existing airtightness testing systems generally suffer from problems such as insufficient reliability of electrical interlocks, lack of delay and overtime protection mechanisms, inconspicuous alarm methods, insufficient voltage safety, unclear status indications, low system integration, and poor versatility. They cannot meet the ever-increasing product quality requirements of the manufacturing industry and the increasingly stringent factory safety production standards. Summary of the Invention

[0005] The purpose of this invention is to provide an airtightness detection and control system that adopts hardware electrical interlocking without relying on software control, has a complete delay and timeout protection mechanism, uses a flashing alarm method, can use a low-voltage safe power supply, has clear status indication, is easy to maintain, and has strong versatility.

[0006] To solve the above-mentioned technical problems, the present invention provides a flexible fixture airtightness detection and control system based on electrical interlocking, which includes at least an air detection button branch, an air pressure sensor branch, a flashing controller branch, a first time relay branch, a machine tool association branch, a second time relay branch, an alarm light branch, an air detection valve branch, and an airtightness detection status light branch; all of the above branches are connected in parallel to the two ends of the power supply.

[0007] In response to the activation of the gas detection button branch, the flashing controller branch enters the flashing switch state, the first time relay branch is activated and performs the first delayed contact operation, the second time relay branch is activated and performs the second contact delay operation, and the gas detection valve branch is activated to perform workpiece clamping and positioning airtightness detection.

[0008] In response to the flashing controller branch entering the flashing switch state, the airtightness detection status light branch enters the flashing on / off state;

[0009] During the workpiece clamping and positioning airtightness test, if the airtightness pressure on the fixture positioning surface reaches the preset air pressure threshold within the first delay range, the air pressure sensor branch is turned on.

[0010] In response to the activation of the pressure sensor branch, the flashing controller branch is activated, thereby causing the airtightness detection status light branch to be constantly lit, so as to at least remind the user to remove the airtightness maintenance module from the clamp.

[0011] In response to the removal of the airtightness maintenance module, the associated branch of the machine tool is activated, thereby enabling the user to control the machine tool to start the processing flow after the airtightness test based on the preset start button.

[0012] Optionally, the gas detection button branch includes at least a gas detection button, a first relay, a first normally open contact controlled by the first relay, and a first normally closed contact controlled by the second time relay;

[0013] The first end of the gas detection button is electrically connected to the first end of the power supply, and the second end of the gas detection button is electrically connected to the first end of the first relay.

[0014] The second terminal of the first relay is electrically connected to the second terminal of the power supply.

[0015] The first end of the first normally open contact is electrically connected to the first end of the gas detection button, and the second end of the first normally open contact is electrically connected to the first end of the first normally closed contact.

[0016] The second end of the first normally closed contact is electrically connected to the second end of the gas detection button.

[0017] Optionally, the barometric pressure sensor branch includes at least a barometric pressure sensor, a second normally open contact controlled by a first relay, a second relay, a third normally open contact controlled by the second relay, and a second normally closed contact controlled by a second time relay;

[0018] The first end of the pressure sensor is electrically connected to the first end of the power supply, and the second end of the pressure sensor is electrically connected to the first end of the second normally open contact.

[0019] The second terminal of the second normally open contact is electrically connected to the first terminal of the second relay;

[0020] The second terminal of the second relay is electrically connected to the second terminal of the power supply.

[0021] The first end of the third normally open contact is electrically connected to the first end of the pressure sensor, and the second end of the third normally open contact is electrically connected to the first end of the second normally closed contact.

[0022] The second end of the second normally closed contact is electrically connected to the second end of the second normally open contact.

[0023] Optionally, the flashing controller branch includes at least a fourth normally open contact controlled by a first relay, a fifth normally open contact controlled by a second relay, a third relay, a sixth normally open contact controlled by the first relay, and a flashing controller;

[0024] The first end of the fourth normally open contact is electrically connected to the first end of the power supply, and the second end of the fourth normally open contact is electrically connected to the first end of the fifth normally open contact.

[0025] The second end of the fifth normally open contact is electrically connected to the first end of the third relay;

[0026] The second terminal of the third relay is electrically connected to the second terminal of the power supply.

[0027] The first end of the sixth normally open contact is electrically connected to the first end of the fourth normally open contact, and the second end of the sixth normally open contact is electrically connected to the first end of the flashing controller.

[0028] The second terminal of the flashing controller is electrically connected to the second terminal of the fifth normally open contact.

[0029] Optionally, the first time relay branch includes at least a seventh normally open contact controlled by the first relay and the first time relay;

[0030] The first end of the seventh normally open contact is electrically connected to the first end of the power supply, and the second end of the seventh normally open contact is electrically connected to the first end of the first time relay.

[0031] The second terminal of the first time relay is electrically connected to the second terminal of the power supply.

[0032] Optionally, the machine tool associated branch includes at least an eighth normally open contact controlled by a second relay, a third normally closed contact controlled by a pressure sensor, and a machine tool associated relay;

[0033] The first end of the eighth normally open contact is electrically connected to the first end of the power supply, and the second end of the eighth normally open contact is electrically connected to the first end of the third normally closed contact.

[0034] The second end of the third normally closed contact is electrically connected to the first end of the machine tool associated relay;

[0035] The second terminal of the machine tool associated relay is electrically connected to the second terminal of the power supply.

[0036] Optionally, the second time relay branch includes at least a ninth normally open contact controlled by the first relay and the second time relay;

[0037] The first end of the ninth normally open contact is electrically connected to the first end of the power supply, and the second end of the ninth normally open contact is electrically connected to the first end of the second time relay.

[0038] The second terminal of the second time relay is electrically connected to the second terminal of the power supply.

[0039] Optionally, the alarm light branch includes at least a tenth normally open contact controlled by a first time relay, a fourth normally closed contact controlled by a barometric pressure sensor, and an alarm light;

[0040] The first end of the tenth normally open contact is electrically connected to the first end of the power supply, and the second end of the tenth normally open contact is electrically connected to the first end of the fourth normally closed contact.

[0041] The second end of the fourth normally closed contact is electrically connected to the first end of the alarm light;

[0042] The second end of the alarm light is electrically connected to the second end of the power supply.

[0043] Optionally, the gas detection valve branch includes at least the eleventh normally open contact controlled by the first relay and the gas detection valve;

[0044] The first end of the eleventh normally open contact is electrically connected to the first end of the power supply, and the second end of the eleventh normally open contact is electrically connected to the first end of the gas detection valve.

[0045] The second end of the gas detection valve is electrically connected to the second end of the power supply.

[0046] Optionally, the airtightness detection status light branch includes at least the twelfth normally open contact controlled by the third relay and the airtightness detection status light;

[0047] The first end of the twelfth normally open contact is electrically connected to the first end of the power supply, and the second end of the twelfth normally open contact is electrically connected to the first end of the airtightness detection status light.

[0048] The second terminal of the airtightness detection status light is electrically connected to the second terminal of the power supply.

[0049] The flexible fixture airtightness detection and control system based on electrical interlocking provided in this embodiment of the invention includes at least an air detection button branch, an air pressure sensor branch, a flashing controller branch, a first time relay branch, a machine tool association branch, a second time relay branch, an alarm light branch, an air detection valve branch, and an airtightness detection status light branch; all of the above branches are connected in parallel to the two ends of the power supply. In response to the activation of the air pressure test button branch, the flashing controller branch enters the flashing switch state, the first time relay branch activates and executes the first delayed contact operation, the second time relay branch activates and executes the second contact delay operation, and the air pressure test valve branch activates to perform workpiece clamping and positioning airtightness detection; in response to the flashing controller branch entering the flashing switch state, the airtightness detection status light branch enters the flashing on / off state; during the workpiece clamping and positioning airtightness detection process, if the airtightness pressure on the fixture positioning surface reaches the preset air pressure threshold within the first delay range, the air pressure sensor branch activates; in response to the activation of the air pressure sensor branch, the flashing controller branch switches to the activation state, thereby causing the airtightness detection status light branch to switch to the constant on state, at least reminding the user to remove the airtightness maintenance module on the fixture; in response to the removal of the airtightness maintenance module, the machine tool associated branch activates, thereby enabling the user to control the machine tool to start the machining process after the airtightness detection based on the preset start button.

[0050] Therefore, the embodiments of the present invention provide an airtightness detection and control system that adopts hardware electrical interlock without relying on software control, has a complete delay and timeout protection mechanism, adopts flashing alarm mode, can use low-voltage safe power supply, has clear status indication, is easy to maintain and has strong versatility, and can realize highly reliable airtightness detection and machine tool interlock functions. Attached Figure Description

[0051] Figure 1 This is a schematic diagram of a flexible fixture airtightness detection and control system based on electrical interlocking provided in an embodiment of the present invention;

[0052] Figure 2 This is a schematic diagram of a machine tool start-up circuit provided in an embodiment of the present invention. Detailed Implementation

[0053] To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0054] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to limit the application. The singular forms “a,” “said,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms, and “multiple” generally includes at least two unless the context clearly indicates otherwise.

[0055] It should be understood that the term "and / or" used in this article 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, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0056] It should be understood that although the terms first, second, third, etc., may be used in the embodiments of this application, these descriptions should not be limited to these terms. These terms are only used to distinguish the descriptions. For example, first may also be referred to as second without departing from the scope of the embodiments of this application, and similarly, second may also be referred to as first.

[0057] Depending on the context, the words “if” or “suppose” as used here can be interpreted as “when” or “in response to determination” or “in response to detection.” Similarly, depending on the context, the phrases “if determination” or “if detection (of the stated condition or event)” can be interpreted as “when determination” or “in response to determination” or “when detection (of the stated condition or event)” or “in response to detection (of the stated condition or event).”

[0058] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that an article or device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or device. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the article or device that includes said element.

[0059] It should be noted that any symbols and / or numbers present in the specification that are not marked in the accompanying drawings are not reference numerals.

[0060] Figure 1 This is a schematic diagram of a flexible fixture airtightness detection and control system based on electrical interlocking provided in an embodiment of the present invention. This embodiment is applicable to at least any CNC machine tool and machining center workpiece clamping and positioning airtightness detection scenario, such as... Figure 1As shown, the flexible fixture airtightness detection control system based on electrical interlocking includes at least the following branches: air detection button branch HL1, air pressure sensor branch HL2, flashing controller branch HL3, first time relay branch HL4, machine tool association branch HL5, second time relay branch HL6, alarm light branch HL7, air detection valve branch HL8, and airtightness detection status light branch HL9.

[0061] The above branch circuits are connected in parallel to the power supply ( Figure 1 The example shows the two ends of a 24V power supply (which may specifically be a DC power supply).

[0062] In one specific implementation, optionally, the gas detection button branch HL1 includes at least a gas detection button PB1, a first relay K1 (which may be a self-locking relay), a first normally open contact CK1 controlled by the first relay K1, and a first normally closed contact CB1 controlled by the second time relay T2.

[0063] The first terminal of the air tightness test button PB1 (a manual start button, used to trigger the air tightness test process; a self-reset button can also be selected) is connected to the first terminal of the power supply (i.e. Figure 1 The 0V common ground terminal is electrically connected, and the second terminal of the gas detection button PB1 is electrically connected to the first terminal of the first relay K1.

[0064] The second terminal of the first relay K1 is connected to the second terminal of the power supply (i.e. Figure 1 Electrical connection (24V terminal);

[0065] The first end of the first normally open contact CK1 is electrically connected to the first end of the gas detection button PB1, and the second end of the first normally open contact CK1 is electrically connected to the first end of the first normally closed contact CB1.

[0066] The second terminal of the first normally closed contact CB1 is electrically connected to the second terminal of the gas detection button PB1.

[0067] In another specific embodiment, optionally, the air pressure sensor branch HL2 includes at least an air pressure sensor PS1 (which can detect the air tightness pressure of the fixture positioning surface in real time, output a switching signal, and whose trigger threshold is adjustable—for example, 0.3MPa~0.5MPa), a second normally open contact CK2 controlled by the first relay K1, a second relay K2, a third normally open contact CK3 controlled by the second relay K2, and a second normally closed contact CB2 controlled by the second time relay T2;

[0068] The first end of the bar pressure sensor PS1 is electrically connected to the first end of the power supply, and the second end of the bar pressure sensor PS2 is electrically connected to the first end of the second normally open contact CK2.

[0069] The second terminal of the second normally open contact CK2 is electrically connected to the first terminal of the second relay K2;

[0070] The second terminal of the second relay K2 is electrically connected to the second terminal of the power supply.

[0071] The first end of the third normally open contact CK3 is electrically connected to the first end of the barometric pressure sensor PS1, and the second end of the third normally open contact CK3 is electrically connected to the first end of the second normally closed contact CB2.

[0072] The second terminal of the second normally closed contact CB2 is electrically connected to the second terminal of the second normally open contact CK2.

[0073] In another specific embodiment, optionally, the flashing controller branch HL3 includes at least the fourth normally open contact CK4 controlled by the first relay K1, the fifth normally open contact CK5 controlled by the second relay K2, the third relay K3, the sixth normally open contact CK6 controlled by the first relay K1, and the flashing controller KE1 (whose flashing frequency can be 1Hz-2Hz).

[0074] The first end of the fourth normally open contact CK4 is electrically connected to the first end of the power supply, and the second end of the fourth normally open contact CK4 is electrically connected to the first end of the fifth normally open contact CK5.

[0075] The second terminal of the fifth normally open contact CK5 is electrically connected to the first terminal of the third relay K3;

[0076] The second terminal of the third relay K3 is electrically connected to the second terminal of the power supply.

[0077] The first end of the sixth normally open contact CK6 is electrically connected to the first end of the fourth normally open contact CK4, and the second end of the sixth normally open contact CK6 is electrically connected to the first end of the flashing controller KE1.

[0078] The second terminal of the flashing controller KE1 is electrically connected to the second terminal of the fifth normally open contact CK5.

[0079] In another specific implementation, optionally, the first time relay branch HL4 includes at least the seventh normally open contact CK7 controlled by the first time relay KI, and the first time relay T1;

[0080] The first terminal of the seventh normally open contact CK7 is electrically connected to the first terminal of the power supply, and the second terminal of the seventh normally open contact CK7 is electrically connected to the first terminal of the first time relay T1.

[0081] The second terminal of the first time relay T1 is electrically connected to the second terminal of the power supply.

[0082] In another specific implementation, optionally, the machine tool associated branch HL5 includes at least the eighth normally open contact CK8 controlled by the second relay K2, the third normally closed contact CB3 controlled by the air pressure sensor PS1, and the machine tool associated relay KA1 (which can be used to control the effectiveness of the machine tool start-up circuit). Figure 2 This is a schematic diagram of a machine tool starting circuit provided in an embodiment of the present invention. See also: Figure 2 The machine tool start circuit includes at least a machine tool start button PB2 and a normally open contact KB1 controlled by a machine tool associated relay KA1. After the machine tool associated relay KA1 is energized, the corresponding normally open contact KB1 closes. In response to the user pressing the machine tool start button PB2, a machine tool processing start signal is output to control the machine tool operation.

[0083] The first end of the eighth normally open contact CK8 is electrically connected to the first end of the power supply, and the second end of the eighth normally open contact CK8 is electrically connected to the first end of the third normally closed contact CB3.

[0084] The second terminal of the third normally closed contact CB3 is electrically connected to the first terminal of the machine tool associated relay KA1;

[0085] The second terminal of the machine tool associated relay KA1 is electrically connected to the second terminal of the power supply.

[0086] In another specific implementation, the second time relay branch HL6 may optionally include at least the ninth normally open contact CK9 controlled by the first relay K1, and the second time relay T2 (at least for airtightness detection timeout protection).

[0087] The first terminal of the ninth normally open contact CK9 is electrically connected to the first terminal of the power supply, and the second terminal of the ninth normally open contact CK9 is electrically connected to the first terminal of the second time relay T2.

[0088] The second terminal of the second time relay T2 is electrically connected to the second terminal of the power supply.

[0089] In another specific implementation, optionally, the alarm light branch HL7 includes at least the tenth normally open contact CK10 controlled by the first time relay T1, the fourth normally closed contact CB4 controlled by the air pressure sensor PS1, and the alarm light HB1 (for example, a red alarm light can be used, which can at least issue an alarm when the air tightness test fails).

[0090] The first end of the tenth normally open contact CK10 is electrically connected to the first end of the power supply, and the second end of the tenth normally open contact CK10 is electrically connected to the first end of the fourth normally closed contact CB4.

[0091] The second terminal of the fourth normally closed contact CB4 is electrically connected to the first terminal of the alarm light HB1;

[0092] The second terminal of the alarm light HB1 is electrically connected to the second terminal of the power supply.

[0093] In another specific embodiment, optionally, the gas detection valve branch HL8 includes at least the eleventh normally open contact CK11 controlled by the first relay K1, and the gas detection valve SOL1 (which may be a solenoid valve, used at least to control the on / off of airtight gas, with an operating pressure of, for example, 0.4MPa~0.6MPa).

[0094] The first terminal of the eleventh normally open contact CK11 is electrically connected to the first terminal of the power supply, and the second terminal of the eleventh normally open contact CK11 is electrically connected to the first terminal of the gas detection valve SOL1.

[0095] The second terminal of the air detection valve SOL1 is electrically connected to the second terminal of the power supply.

[0096] In another specific implementation, optionally, the airtightness test status light branch HL9 includes at least the twelfth normally open contact CK12 controlled by the third relay K3, and the airtightness test status light HB2 (which may be a green status light to at least indicate that the airtightness test is qualified).

[0097] The first terminal of the twelfth normally open contact CK12 is electrically connected to the first terminal of the power supply, and the second terminal of the twelfth normally open contact CK12 is electrically connected to the first terminal of the airtightness detection status light HB2.

[0098] The second terminal of the airtightness test status light HB2 is electrically connected to the second terminal of the power supply.

[0099] In another specific implementation, optionally, the working principle of the flexible fixture airtightness detection and control system based on electrical interlocking is at least as follows:

[0100] In response to the activation of the gas detection button branch HL1, the flashing controller branch HL3 enters the flashing switch state, the first time relay branch HL4 is activated and performs the first delayed contact operation, the second time relay branch HL6 is activated and performs the second contact delay operation, and the gas detection valve branch HL8 is activated to perform workpiece clamping and positioning airtightness detection.

[0101] In response to the flashing controller branch HL3 entering the flashing switch state, the air tightness detection status light branch HL9 enters the flashing on / off state (that is, the air tightness detection status light HB2 continuously lights up and turns off, flashing continuously).

[0102] During the workpiece clamping and positioning airtightness test, if the airtightness pressure on the fixture positioning surface reaches the preset air pressure threshold within the first delay range (e.g., within 5 seconds), the air pressure sensor branch HL2 is turned on.

[0103] In response to the activation of the barometric pressure sensor branch HL2, the flashing controller branch HL3 is activated, which in turn causes the airtightness detection status light branch HL9 to turn on continuously, so as to at least remind the user to remove the airtightness maintenance module (such as an airtightness maintenance valve, airtightness maintenance tube, etc.) from the fixture.

[0104] In response to the removal of the airtightness maintenance module, the machine tool associated branch HL5 is turned on, thereby enabling the user to control the machine tool to start the machining process after the airtightness test based on the preset start button (i.e. the aforementioned machine tool start button PB2).

[0105] More specifically, in response to the user pressing and closing the gas detection button PB1, the first relay K1 is momentarily energized, and the first normally open contact CK1, the second normally open contact CK2, the fourth normally open contact CK4, the sixth normally open contact CK6, the seventh normally open contact CK7, the ninth normally open contact CK9, and the eleventh normally open contact CK11 all self-lock and close. This causes:

[0106] 1. The circuit consisting of the first normally open contact CK1, the first normally closed contact CB1, and the first relay K1 is connected;

[0107] 2. The circuit consisting of the sixth normally open contact CK6, the flashing controller KE1, and the third relay K3 is connected (the flashing controller KE1 is similar to a switch that is constantly opening and closing, which will cause the third relay K3 to be continuously energized and de-energized, and in turn, the twelfth normally open contact CK12 will also be continuously opened and closed, and the airtightness detection status light HB2 will continue to flash, indicating that the system is performing an airtightness detection).

[0108] 3. The circuit formed by the seventh normally open contact CK7 and the first time relay T1 is turned on, and the first time relay T1 controls the tenth normally open contact CK10 to close after a 5-second delay;

[0109] 4. The circuit formed by the ninth normally open contact CK9 and the second time relay T2 is turned on. After a delay of 20 seconds, the second time relay T2 controls the first normally closed contact CB1 and the second normally closed contact CB2 to open.

[0110] 5. The circuit consisting of the eleventh normally open contact CK11 and the gas detection valve SOL1 is turned on, and the airtight gas enters the fixture positioning surface through at least the gas detection valve SOL1 to perform the workpiece clamping and positioning airtightness test.

[0111] Furthermore, if neither the workpiece nor the flexible fixture has airtightness issues, then within the first delay range of the first time relay T1—5 seconds—the airtightness pressure on the fixture positioning surface will reach the preset air pressure threshold. At this time, the circuit composed of the air pressure sensor PS1, the second normally open contact CK2, and the second relay K2 is connected. The third normally open contact CK3, the fifth normally open contact CK5, and the eighth normally open contact CK8 are controlled by the self-locking closure of the second relay K2. Simultaneously, the third normally closed contact CB3 and the fourth normally closed contact CB4 are disconnected. This results in:

[0112] 1. The circuit consisting of the third normally open contact CK3, the second normally closed contact CB2, and the second relay K2 is connected;

[0113] 2. The circuit consisting of the fourth normally open contact CK4, the fifth normally open contact CK5 and the third relay K3 is connected. The third relay K3 is no longer controlled by the flashing controller KE1, but is always in the energized state. As a result, the twelfth normally open contact CK12 no longer opens and closes continuously, but is always in the closed state. The airtightness detection status light HB2 is always on, indicating that the airtightness detection of the system has been completed.

[0114] 3. The circuit consisting of the eighth normally open contact CK8, the third normally closed contact CB3, and the machine tool associated relay KA1 is open. The machine tool associated relay KA1 cannot be energized, and therefore cannot close the normally open contact KB1 controlled by the machine tool associated relay KA1.

[0115] At this point, the user needs to determine that the airtightness test has been completed based on the constantly lit airtightness test status light HB2 and then remove the airtightness maintenance module. After the airtightness maintenance module is removed, the air pressure sensor PS1 detects that the airtightness pressure on the fixture positioning surface cannot reach the preset air pressure threshold. The third normally closed contact CB3 and the fourth normally closed contact CB4 close again, and the machine tool associated branch HL5, composed of the eighth normally open contact CK8, the third normally closed contact CB3, and the machine tool associated relay KA1, is activated. This allows the user to control the machine tool to start the machining process after the airtightness test based on the machine tool start button PB2.

[0116] Understandably, if any of the above steps fail, in response to the delayed triggering of the second time relay T2, both the first normally closed contact CB1 and the second normally closed contact CB2 will open, directly breaking the self-locking circuit of the first relay K1 and the second relay K2, providing detection timeout protection and preventing the system from locking up.

[0117] It is also understandable that if there is an airtightness problem with the workpiece and / or the flexible fixture, after the first delay range of the first time relay T1—5 seconds—the airtightness pressure on the fixture positioning surface cannot reach the preset air pressure threshold. At this time, the tenth normally open contact CK10 is closed under the control of the first time relay T1. The circuit composed of the tenth normally open contact CK1, the fourth normally closed contact CB4, and the alarm light HB1 is connected, and the alarm light HB1 is constantly lit to warn the user that there is an airtightness problem with the workpiece and / or the flexible fixture. Until the second time relay T2 is triggered after a delay, the first normally closed contact CB1 and the second normally closed contact CB2 are both opened, directly breaking the self-locking circuit of the first relay K1 and the second relay K2.

[0118] The flexible fixture airtightness detection and control system based on electrical interlocking provided in this embodiment includes at least an air detection button branch, an air pressure sensor branch, a flashing controller branch, a first time relay branch, a machine tool association branch, a second time relay branch, an alarm light branch, an air detection valve branch, and an airtightness detection status light branch; all of the above branches are connected in parallel to the two ends of the power supply. In response to the activation of the air pressure test button branch, the flashing controller branch enters the flashing switch state, the first time relay branch activates and executes the first delayed contact operation, the second time relay branch activates and executes the second contact delay operation, and the air pressure test valve branch activates to perform workpiece clamping and positioning airtightness detection; in response to the flashing controller branch entering the flashing switch state, the airtightness detection status light branch enters the flashing on / off state; during the workpiece clamping and positioning airtightness detection process, if the airtightness pressure on the fixture positioning surface reaches the preset air pressure threshold within the first delay range, the air pressure sensor branch activates; in response to the activation of the air pressure sensor branch, the flashing controller branch switches to the activation state, thereby causing the airtightness detection status light branch to switch to the constant on state, at least reminding the user to remove the airtightness maintenance module on the fixture; in response to the removal of the airtightness maintenance module, the machine tool associated branch activates, thereby enabling the user to control the machine tool to start the machining process after the airtightness detection based on the preset start button.

[0119] Therefore, this embodiment provides an airtightness detection and control system that adopts hardware electrical interlock without relying on software control, has a complete delay and timeout protection mechanism, adopts flashing alarm mode, can use low-voltage safe power supply, has clear status indication, is easy to maintain and has strong versatility, and can realize highly reliable airtightness detection and machine tool interlock functions.

[0120] It should be noted that the present invention has at least the following beneficial effects:

[0121] 1. High reliability of electrical interlock: It adopts hardware relay interlock, does not rely on software control, and can still maintain a safe state in the event of power failure or system failure;

[0122] 2. Comprehensive delay protection mechanism: The first time relay's 5-second delay ensures that the air pressure stabilizes before detection, avoiding misjudgment; the second time relay's 20-second delay provides detection timeout protection to prevent system deadlock.

[0123] 3. Low-voltage safety design: It adopts a 24V DC power supply, which meets electrical safety standards and reduces the risk of electric shock;

[0124] 4. Clear status indication: The airtightness test status light - a solid green light indicates that the test is qualified, and a solid red alarm light indicates that the test is unqualified. The operator can quickly judge the system status.

[0125] 5. High versatility: External independent control system, not dependent on the machine tool's internal system, and can be adapted to most machine tools;

[0126] 6. Good cost control: Standard electrical components (relays, time relays, sensors, etc.) are used, resulting in low procurement costs and convenient maintenance;

[0127] 7. Good scalability: Multiple sets of relay contacts can be reserved to facilitate the expansion of other functions (such as positioning pin detection, workpiece counting, etc.).

[0128] It should also be noted that the following are several alternative and extended solutions:

[0129] 1. Alternative solutions

[0130] (1) The time relay delay parameters can be replaced according to the actual working conditions: the 5-second delay of the first time relay can be adjusted to any time delay between 3 seconds and 10 seconds according to the actual working conditions, and the 20-second delay of the second time relay can be adaptively adjusted to any time delay between 10 seconds and 60 seconds.

[0131] (2) The flashing frequency is replaceable: the flashing frequency of the flashing controller can be adjusted from 1Hz-2Hz to any flashing frequency band from 0.5Hz-3Hz as needed;

[0132] (3) The power supply voltage is replaceable: the 24V DC power supply can be replaced with a 12V or 48V DC power supply, as long as it meets the safety voltage standard;

[0133] (4) The number of relay contacts can be replaced: the number of contacts of each relay can be increased or decreased according to actual needs, as long as the control requirements are met;

[0134] (5) Replaceable pressure sensor type: The pressure sensor can be replaced with pressure detection elements with switch output, such as pressure switch and pressure transmitter;

[0135] (6) Alarm methods can be replaced: the alarm light can be replaced with other alarm methods such as sound and light alarm, voice alarm, screen prompt;

[0136] (7) Control button type can be replaced: the gas detection button can be replaced with other triggering methods such as foot switch, induction switch, touch screen button;

[0137] (8) The system architecture is replaceable: the external independent control can be replaced by embedded control, PLC control, etc., as long as the same electrical interlock function is achieved;

[0138] (9) The number of testing stations can be replaced: single-station testing can be expanded to multi-station testing, adding multiple air pressure sensors in parallel or series for testing.

[0139] 2. Extension Scheme

[0140] (1) Add multi-station detection function

[0141] Multiple barometric pressure sensors (such as PS2, PS3, etc.) can be added. Figure 1 and Figure 2 (Not shown in the image) The airtightness of different positioning surfaces is detected separately, and all sensor signals are connected in series and input to the second relay. The second relay is energized only when the airtightness test of all positioning surfaces is qualified (i.e., the air pressure of the positioning surface measured by each air pressure sensor reaches the preset air pressure threshold). The machine tool associated relay is energized after the user removes the airtightness maintenance module from the fixture. This scheme is applicable to the detection of workpieces with multiple positioning surfaces, further improving positioning accuracy and machining quality.

[0142] (2) Add a manual / automatic switching switch

[0143] In manual mode, the machine tool can be forcibly started (for debugging purposes only). In automatic mode, the machine tool must pass an airtightness test before it can be started. The switch can be connected in parallel between the first end of the eighth normally open contact and the second end of the third normally closed contact. In manual mode, the CK8 contact is bypassed, and in automatic mode, the CK8 contact must be closed.

[0144] (3) Emergency stop protection function

[0145] An emergency stop button is connected in series in the power supply circuit so that the power supply to all control circuits can be cut off in an emergency.

[0146] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A flexible clamp airtightness detection and control system based on electrical interlocking, characterized in that, It includes at least the following branches: air detection button branch, air pressure sensor branch, flashing controller branch, first time relay branch, machine tool association branch, second time relay branch, alarm light branch, air detection valve branch, and air tightness detection status light branch. The above branch circuits are connected in parallel to both ends of the power supply. In response to the activation of the gas detection button branch, the flashing controller branch enters the flashing switch state, the first time relay branch is activated and performs the first delayed contact operation, the second time relay branch is activated and performs the second contact delay operation, and the gas detection valve branch is activated to perform workpiece clamping and positioning airtightness detection. In response to the flashing controller branch entering the flashing switch state, the airtightness detection status light branch enters the flashing on / off state; During the workpiece clamping and positioning airtightness test, if the airtightness pressure on the fixture positioning surface reaches the preset air pressure threshold within the first delay range, the air pressure sensor branch is turned on. In response to the activation of the pressure sensor branch, the flashing controller branch is activated, thereby causing the airtightness detection status light branch to be constantly lit, so as to at least remind the user to remove the airtightness maintenance module from the clamp. In response to the removal of the airtightness maintenance module, the associated branch of the machine tool is activated, thereby enabling the user to control the machine tool to start the processing flow after the airtightness test based on the preset start button.

2. The flexible clamp airtightness detection and control system based on electrical interlocking according to claim 1, characterized in that, The gas detection button branch includes at least a gas detection button, a first relay, a first normally open contact controlled by the first relay, and a first normally closed contact controlled by a second time relay; The first end of the gas detection button is electrically connected to the first end of the power supply, and the second end of the gas detection button is electrically connected to the first end of the first relay. The second terminal of the first relay is electrically connected to the second terminal of the power supply. The first end of the first normally open contact is electrically connected to the first end of the gas detection button, and the second end of the first normally open contact is electrically connected to the first end of the first normally closed contact. The second end of the first normally closed contact is electrically connected to the second end of the gas detection button.

3. The flexible fixture airtightness detection and control system based on electrical interlocking according to claim 1, characterized in that, The pressure sensor branch includes at least a pressure sensor, a second normally open contact controlled by a first relay, a second relay, a third normally open contact controlled by the second relay, and a second normally closed contact controlled by a second time relay; The first end of the pressure sensor is electrically connected to the first end of the power supply, and the second end of the pressure sensor is electrically connected to the first end of the second normally open contact. The second terminal of the second normally open contact is electrically connected to the first terminal of the second relay; The second terminal of the second relay is electrically connected to the second terminal of the power supply. The first end of the third normally open contact is electrically connected to the first end of the pressure sensor, and the second end of the third normally open contact is electrically connected to the first end of the second normally closed contact. The second end of the second normally closed contact is electrically connected to the second end of the second normally open contact.

4. The flexible clamp airtightness detection and control system based on electrical interlocking according to claim 1, characterized in that, The flashing controller branch includes at least a fourth normally open contact controlled by a first relay, a fifth normally open contact controlled by a second relay, a third relay, a sixth normally open contact controlled by the first relay, and a flashing controller; The first end of the fourth normally open contact is electrically connected to the first end of the power supply, and the second end of the fourth normally open contact is electrically connected to the first end of the fifth normally open contact. The second end of the fifth normally open contact is electrically connected to the first end of the third relay; The second terminal of the third relay is electrically connected to the second terminal of the power supply. The first end of the sixth normally open contact is electrically connected to the first end of the fourth normally open contact, and the second end of the sixth normally open contact is electrically connected to the first end of the flashing controller. The second terminal of the flashing controller is electrically connected to the second terminal of the fifth normally open contact.

5. The flexible clamp airtightness detection and control system based on electrical interlocking according to claim 1, characterized in that, The first time relay branch includes at least a seventh normally open contact controlled by the first relay and the first time relay; The first end of the seventh normally open contact is electrically connected to the first end of the power supply, and the second end of the seventh normally open contact is electrically connected to the first end of the first time relay. The second terminal of the first time relay is electrically connected to the second terminal of the power supply.

6. The flexible clamp airtightness detection and control system based on electrical interlocking according to claim 1, characterized in that, The machine tool associated branch includes at least an eighth normally open contact controlled by a second relay, a third normally closed contact controlled by a pressure sensor, and a machine tool associated relay; The first end of the eighth normally open contact is electrically connected to the first end of the power supply, and the second end of the eighth normally open contact is electrically connected to the first end of the third normally closed contact. The second end of the third normally closed contact is electrically connected to the first end of the machine tool associated relay; The second terminal of the machine tool associated relay is electrically connected to the second terminal of the power supply.

7. The flexible clamp airtightness detection and control system based on electrical interlocking according to claim 1, characterized in that, The second time relay branch includes at least a ninth normally open contact controlled by the first relay and the second time relay; The first end of the ninth normally open contact is electrically connected to the first end of the power supply, and the second end of the ninth normally open contact is electrically connected to the first end of the second time relay. The second terminal of the second time relay is electrically connected to the second terminal of the power supply.

8. The flexible clamp airtightness detection and control system based on electrical interlocking according to claim 1, characterized in that, The alarm light branch includes at least the tenth normally open contact controlled by the first time relay, the fourth normally closed contact controlled by the barometric pressure sensor, and the alarm light; The first end of the tenth normally open contact is electrically connected to the first end of the power supply, and the second end of the tenth normally open contact is electrically connected to the first end of the fourth normally closed contact. The second end of the fourth normally closed contact is electrically connected to the first end of the alarm light. The second end of the alarm light is electrically connected to the second end of the power supply.

9. The flexible clamp airtightness detection and control system based on electrical interlocking according to claim 1, characterized in that, The gas detection valve branch includes at least the eleventh normally open contact controlled by the first relay and the gas detection valve; The first end of the eleventh normally open contact is electrically connected to the first end of the power supply, and the second end of the eleventh normally open contact is electrically connected to the first end of the gas detection valve. The second end of the gas detection valve is electrically connected to the second end of the power supply.

10. The flexible clamp airtightness detection and control system based on electrical interlocking according to claim 1, characterized in that, The airtightness detection status light branch includes at least the twelfth normally open contact controlled by the third relay and the airtightness detection status light; The first end of the twelfth normally open contact is electrically connected to the first end of the power supply, and the second end of the twelfth normally open contact is electrically connected to the first end of the airtightness detection status light. The second terminal of the airtightness detection status light is electrically connected to the second terminal of the power supply.

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