A limit switch triggering device and a fault diagnosis method

Abstract

This invention discloses a limit switch triggering device, comprising: a support member fixedly mounted on a bracket; a rotating frame, the middle portion of which is hinged to the support member at a first hinge point, the first end of the rotating frame having a through hole whose axis is vertically oriented; a trigger rod disposed within the through hole, the trigger rod being slidable within the through hole; the trigger rod being located above a movable frame, wherein when the rotating frame rotates around the first hinge point to a first position, the vertical projection of the trigger rod coincides with the vertical projection of the movable frame; when the rotating frame rotates around the first hinge point to a second position, the vertical projection of the trigger rod does not coincide with the vertical projection of the movable frame. This invention can reduce the fault inspection time of the self-cleaning device of an air conditioning unit and improve inspection efficiency. Furthermore, this invention also discloses a method for fault inspection of the self-cleaning device of an air conditioning unit using the aforementioned limit switch triggering device.

Description

Technical Field

[0001] This invention relates to the field of testing technology for self-cleaning devices of air conditioning units, and in particular to a limit switch triggering device and a fault diagnosis method. Background Technology

[0002] Air conditioning units are widely used in industrial fields and are important air conditioning equipment. The self-cleaning device of the air conditioning unit is 100% effective. Figure 1 As shown, it is used to clean the filter plate 110 inside the air conditioning unit. In practical applications, if the filter plate 110 is not cleaned for a long time, it is prone to clogging. Once the filter plate 110 is clogged, the pressure difference across it will increase, the ventilation rate will decrease, and in severe cases, the air conditioning temperature and humidity will not meet the standards, affecting the enterprise's output and quality. Therefore, the self-cleaning device 100 of the air conditioning unit plays a very important role in ensuring the normal operation of the air conditioning unit.

[0003] 100 self-cleaning devices for air conditioning units Figure 1 As shown, the system includes a lifting mechanism 102, a lifting motor 101, an upper limit switch 106, and a lower limit switch 107, all mounted on a support 108. The lifting mechanism 102 is typically a sprocket and chain structure. A movable frame 103 is mounted on the chain of the lifting mechanism 102. The lifting motor 101 is connected to the lifting mechanism 102 and drives the lifting mechanism 102 to move the movable frame 103 back and forth between the upper limit switch 106 and the lower limit switch 107. The movable frame 103 is equipped with multiple nozzles 105, each nozzle 105 extending into the gap between the filter plates 110. The nozzles 105 are connected to a water pump system, which provides cleaning fluid to the nozzles 105 to clean the filter plates 110. Each nozzle 105 is electrically connected to a solenoid valve 104, which controls the opening and closing of the nozzle 105.

[0004] When the air conditioning unit's self-cleaning device 100 cleans the filter plate 110, because the water pressure is insufficient to allow all nozzles 105 to open simultaneously, only one nozzle 105 opens during each round trip of the moving frame 103, while the rest remain closed. The specific workflow is as follows: The air conditioning unit's self-cleaning device 100 is activated, and the moving frame 103 moves to the starting position (i.e., within the sensing area of ​​the lower limit switch 107). At this point, the moving frame 103 triggers the lower limit switch 107, which sends a signal to the control system. The control system then controls the solenoid valve 104 connected to the first nozzle 105 to open, and simultaneously controls the moving frame 103 to move upwards, thus driving the first nozzle 105 to clean the filter plate 110. When the moving frame 103 moves upwards to the upper limit switch 106, it triggers the upper limit switch 106, which then sends a signal to the control system to control... The system controls the moving frame 103 to move downwards; when the moving frame 103 returns to the starting point, the moving frame 103 triggers the lower limit switch 107 again. The lower limit switch 107 sends a signal to the control system, which controls the solenoid valve 104 connected to the first nozzle 105 to close and controls the solenoid valve 104 connected to the second nozzle 105 to open. At the same time, it controls the moving frame 103 to move upwards again. The above steps are repeated. After the upper limit switch 106 and the lower limit switch 107 have reciprocated once and returned to the starting point, the next nozzle 105 is opened. This process continues until all nozzles 105 have completed cleaning the filter plate 110.

[0005] After prolonged operation, the self-cleaning device 100 of the air conditioning unit is prone to malfunction. Therefore, it is necessary to regularly inspect the self-cleaning device 100 to identify and eliminate faults, ensuring its normal operation. Possible malfunctions of the self-cleaning device 100 include: water pump system failure, solenoid valve failure, nozzle failure, upper limit switch failure, lower limit switch failure, lifting motor failure, and lifting mechanism failure. A general inspection method involves starting the self-cleaning device 100 to clean the filter plate 110, with manual on-site monitoring, while simultaneously observing whether the self-cleaning device 100 is operating normally to determine if there is a malfunction.

[0006] However, since each nozzle 105 and solenoid valve 104 must be opened one by one, the moving frame 103 needs to trigger the upper limit switch 106 and the lower limit switch 107 and run back and forth between the upper limit switch 106 and the lower limit switch 107 for each set of solenoid valves 104 and nozzles 105 to check. Therefore, if you want to check whether all nozzles 105 and solenoid valves 104 are faulty, the moving frame 103 needs to run back and forth between the upper limit switch 106 and the lower limit switch 107 multiple times to complete the test. The distance between the upper limit switch 106 and the lower limit switch 107 is also very large, generally about 4 meters. This results in a long running distance and time for the moving frame 103. It takes 1.5 hours to complete one fault check of the air conditioning unit self-cleaning device 100, resulting in long inspection time and low efficiency. Summary of the Invention

[0007] The purpose of this invention is to solve the problems of long inspection times and low efficiency in troubleshooting self-cleaning devices of air conditioning units. This invention provides a limit switch triggering device and a troubleshooting method, which can reduce the troubleshooting time of self-cleaning devices in air conditioning units and improve inspection efficiency.

[0008] To solve the above-mentioned technical problems, an embodiment of the present invention discloses a limit switch triggering device, which is disposed on an air conditioning unit self-cleaning device. The air conditioning unit self-cleaning device includes: a bracket, an upper limit switch and a lower limit switch arranged sequentially on the bracket in a vertical direction, and a movable frame disposed between the upper limit switch and the lower limit switch. The movable frame is capable of reciprocating between the upper limit switch and the lower limit switch. The limit switch triggering device is characterized by comprising:

[0009] Support components are fixedly mounted on the bracket;

[0010] The rotating frame has its middle part hinged to the support member at the first hinge point, and the first end of the rotating frame is provided with a through hole, the axis of which is set in the vertical direction;

[0011] A trigger rod is located inside the through hole, and the trigger rod can slide within the through hole;

[0012] When the rotating frame rotates around the first hinge point to the first position, the projection of the trigger rod in the vertical direction coincides at least partially with the projection of the moving frame in the vertical direction; when the rotating frame rotates around the first hinge point to the second position, the projection of the trigger rod in the vertical direction separates from the projection of the moving frame in the vertical direction.

[0013] By adopting the above technical solution, a limit switch triggering device is installed on the self-cleaning device of the air conditioning unit. When the moving frame is located below the trigger rod and moves upward, the moving frame can contact the lower end of the trigger rod and drive the trigger rod upward. When the upper end of the trigger rod moves to the sensing area of ​​the upper limit switch, the upper end of the trigger rod can trigger the upper limit switch, without the moving frame needing to move to the sensing area of ​​the upper limit switch to trigger it. This effectively reduces the travel and running time of the moving frame, thereby reducing the fault inspection time of the air conditioning unit's self-cleaning device and improving inspection efficiency. Furthermore, by setting up a support and a rotating frame, the rotating frame can drive the trigger rod to rotate around the first hinge point. When the air conditioning unit's self-cleaning device is working normally, the rotating frame drives the trigger rod to rotate to the second position, so that the moving frame will not come into contact with the moving frame and the trigger rod during its up-and-down movement. This prevents the moving frame and the trigger rod from interfering with the normal operation of the air conditioning unit's self-cleaning device. When it is necessary to check the air conditioning unit's self-cleaning device for faults, firstly, the moving frame is driven to the sensing area of ​​the lower limit switch, and then the rotating frame is driven to rotate to the first position, so that the moving frame can contact the lower end of the trigger rod when it moves upward and drive the trigger rod to move upward, thereby reducing the travel and running time of the moving frame.

[0014] Optionally, it also includes:

[0015] The push rod has one end hinged to the second end of the rotating frame at the second hinge point;

[0016] The drive mechanism has its fixed end hinged to the bracket, and its driving end is connected to the other end of the push rod. The drive mechanism is used to drive the push rod to perform reciprocating linear motion.

[0017] By adopting the above technical solution, and by setting a push rod and a drive mechanism, the drive mechanism can drive the rotating frame to rotate around the first hinge point through the push rod, thereby realizing the automated rotation of the rotating frame.

[0018] Optionally, the rotating frame includes:

[0019] The second end of the rod is hinged to the push rod at the second hinge point;

[0020] The fork is fixedly connected to the first end of the rod. The fork includes a longitudinal rod, an upper crossbar, and a lower crossbar. The middle part of the longitudinal rod is connected to the first end of the rod. The upper crossbar is fixedly connected to the upper end of the longitudinal rod, and the lower crossbar is fixedly connected to the lower end of the longitudinal rod. There are two through holes, which are respectively opened on the upper crossbar and the lower crossbar, and the axes of the two through holes coincide.

[0021] By adopting the above technical solution, and by setting a fork, the trigger rod can pass through two through holes with a certain distance between them, which can make the installation of the trigger rod more stable and at the same time enhance the structural strength of the rotating frame.

[0022] Optionally, the upper part of the trigger rod is provided with an upper retainer, which is a protrusion protruding from the circumferential surface of the trigger rod. The upper retainer is located above the upper crossbar and is used to restrict the trigger rod from sliding downward when it comes into contact with the upper crossbar.

[0023] By adopting the above technical solution and setting an upper retainer, the trigger rod can be prevented from sliding out from below the through hole and falling down.

[0024] Optionally, the upper part of the trigger rod is provided with an upper pin hole, and the upper locking member is a pin shaft, which is located in the upper pin hole.

[0025] Optionally, the distance between the bottom end of the upper clip and the lower end of the trigger rod is less than the distance between the top end of the upper crossbar and the upper limit of the sensing area of ​​the lower limit switch.

[0026] Before the rotating frame drives the trigger rod to rotate between the first and second positions, the moving frame is first controlled to move downward to the sensing area of ​​the lower limit switch, and then the rotating frame 1 is controlled to rotate. By adopting the above technical solution, the lower end of the trigger rod can always be located above the moving frame during the rotation of the rotating frame, thereby preventing the trigger rod from interfering with the moving frame during the movement and causing damage to the device.

[0027] Optionally, the lower part of the trigger lever is provided with a lower retainer, which is a protrusion protruding from the circumferential surface of the trigger lever. The lower retainer is located below the lower crossbar and is used to restrict the trigger lever from sliding upward when it contacts the lower crossbar.

[0028] By adopting the above technical solution and setting a lower locking component, the trigger rod can be prevented from sliding out from the top and bottom of the through hole and falling down.

[0029] Optionally, the lower part of the trigger rod is provided with a lower pin hole, and the lower locking member is a pin shaft, which is located in the lower pin hole.

[0030] Optionally, the distance between the top of the lower clip and the upper end of the trigger rod is greater than the distance between the bottom of the lower crossbar and the lower limit of the sensing area of ​​the upper limit switch.

[0031] By adopting the above technical solution, interference between the lower locking component and the lower crossbar can be prevented during the upward movement of the trigger rod. That is, before the upper end of the trigger rod reaches the sensing area of ​​the upper limit switch, the lower locking component has already touched the bottom of the lower crossbar, causing the trigger rod to fail to trigger the upper limit switch.

[0032] Optionally, the drive mechanism is a pneumatic cylinder or an electric cylinder.

[0033] Optionally, the self-cleaning device of the air conditioning unit also includes a lifting motor for driving the moving frame to move up and down, and the limit switch triggering device also includes a control system, which includes:

[0034] The processing module is used to receive signals sent by the upper limit switch and the lower limit switch, and to control the operation of the lifting motor and the drive mechanism.

[0035] The delay module, electrically connected to the processing module, is used to pause the hoisting motor for a certain period of time after the processing module receives a signal from the upper or lower limit switch.

[0036] When the air conditioning unit's self-cleaning device cleans the unit, it sprays cleaning fluid. Because this fluid can negatively impact the control system, the mechanical components of the self-cleaning device must be placed separately from the control cabinet housing the control system. This necessitates two operators to troubleshoot the self-cleaning device: one at the control cabinet and the other observing the unit from the air conditioning unit's interior. Furthermore, the distance between the self-cleaning device's mechanical components and the control cabinet results in poor sound transmission, sometimes requiring another person to relay feedback from the doorway, ultimately necessitating a team of 2-3 people for troubleshooting. The above-mentioned technical solution, by incorporating a time-delay module, allows the operator to move between the self-cleaning device's mechanical components and the control cabinet during the delay period. This allows them to operate the control cabinet while simultaneously observing the self-cleaning device from the air conditioning unit's interior, enabling troubleshooting to be completed by a single operator and reducing the number of personnel required.

[0037] The embodiments of the present invention also disclose a method for fault diagnosis of the self-cleaning device of an air conditioning unit using any of the aforementioned limit switch triggering devices, comprising:

[0038] A1: The rotating frame rotates around the first hinge point to the first position;

[0039] A2: The moving frame moves upward, contacts the lower end of the trigger rod, and drives the trigger rod to move upward;

[0040] A3: The upper end of the trigger rod moves into the sensing area of ​​the upper limit switch and triggers the upper limit switch, receiving the signal sent by the upper limit switch;

[0041] A4: The moving frame moves downwards, causing the trigger lever to move downwards as well;

[0042] A5: The mobile frame moves into the sensing area of ​​the lower limit switch and triggers the lower limit switch, receiving the signal sent by the lower limit switch;

[0043] A6: Repeat steps A2 to A5 until all solenoid valves and nozzles electrically connected to the upper and lower limit switches on the self-cleaning device of the air conditioning unit have been checked.

[0044] By adopting the above technical solution, a limit switch triggering device is installed on the self-cleaning device of the air conditioning unit. When the moving frame moves upward, it can contact the lower end of the trigger rod, driving the trigger rod upward. When the upper end of the trigger rod reaches the sensing area of ​​the upper limit switch, the upper end of the trigger rod can trigger the upper limit switch, without the moving frame needing to move to the sensing area of ​​the upper limit switch to trigger it. This effectively reduces the travel and running time of the moving frame, thereby reducing the fault inspection time of the air conditioning unit's self-cleaning device and improving inspection efficiency.

[0045] Optionally, before step A1, the method further includes: moving the movable frame downwards to the sensing area of ​​the lower limit switch and triggering the lower limit switch, and receiving a signal sent by the lower limit switch.

[0046] By adopting the above technical solution, before the rotating frame drives the trigger rod to rotate from the second position to the first position, the moving frame is first controlled to move downward to the sensing area of ​​the lower limit switch, and then the rotating frame is controlled to rotate from the second position to the first position. This can prevent the bottom of the trigger rod from interfering with the moving frame during the rotation of the rotating frame, thereby preventing damage to the device.

[0047] Optionally, between step A3 and step A4, the following steps are also included: the mobile frame stops operating and waits 3-10 seconds before executing the next step; and between step A5 and step A6, the following steps are also included: the mobile frame stops operating and waits 3-10 seconds before executing the next step.

[0048] By adopting the above technical solution and setting a waiting time, the operator can move back and forth between the mechanical structure of the air conditioning unit's self-cleaning device and the control cabinet during the waiting time. This allows the operator to both operate the control cabinet and observe whether the air conditioning unit's self-cleaning device is working properly. As a result, the fault inspection of the air conditioning unit's self-cleaning device can be completed with only one operator, reducing the number of personnel required for the operation. Attached Figure Description

[0049] Figure 1 A perspective view of a self-cleaning device for air conditioning units in the background art is shown;

[0050] Figure 2 This diagram shows the state of the limit switch triggering device when the lower limit switch is triggered.

[0051] Figure 3 This diagram shows the state of the limit switch triggering device when the upper limit switch is triggered.

[0052] Figure 4 A perspective view of a limit switch triggering device according to an embodiment of the present invention is shown;

[0053] Figure 5 This is a top view of a limit switch triggering device provided in an embodiment of the present invention;

[0054] Figure 6 This is a front view of a limit switch triggering device provided in an embodiment of the present invention.

[0055] Reference numerals: 1. Rotating frame; 11. Rod; 12. Fork; 121. Longitudinal rod; 122. Upper crossbar; 123. Lower crossbar; 13. Through hole; 2. Trigger rod; 21. Upper clamp; 22. Lower clamp; 23. Upper end; 24. Lower end; 25. First hinge point; 26. Second hinge point; 3. Support member; 4. Push rod; 5. Drive mechanism; 100. Self-cleaning device of air conditioning unit; 101. Lifting motor; 102. Lifting mechanism; 103. Moving frame; 104. Solenoid valve; 105. Nozzle; 106. Upper limit switch; 107. Lower limit switch; 108. Bracket; 110. Filter plate. Detailed Implementation

[0056] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Although the description of the present invention is presented in conjunction with preferred embodiments, this does not mean that the features of the invention are limited to these embodiments. On the contrary, the purpose of describing the invention in conjunction with embodiments is to cover other options or modifications that may be derived based on the claims of the present invention. To provide a deep understanding of the invention, many specific details will be included in the following description. The invention may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of the invention, some specific details will be omitted in the description. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0057] It should be noted that in this specification, similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0058] The terms “first”, “second”, etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0059] In the description of this embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment based on the specific circumstances.

[0060] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0061] An embodiment of the present invention discloses a limit switch triggering device, which is disposed on the self-cleaning device 100 of an air conditioning unit. The self-cleaning device 100 of the air conditioning unit is as follows: Figure 1 , Figure 5 As shown, it includes: a bracket 108, a lifting mechanism 102 mounted on the bracket 108, a lifting motor 101 connected to the lifting mechanism 102, an upper limit switch 106 and a lower limit switch 107 sequentially mounted on the bracket 108 in a vertical direction, and a movable frame 103 disposed between the upper limit switch 106 and the lower limit switch 107; the lifting motor 101 can drive the movable frame 103 to reciprocate between the upper limit switch 106 and the lower limit switch 107 via the lifting mechanism 102, and the limit switch triggering device is as follows: Figure 4 As shown, it includes:

[0062] Support 3 is fixedly mounted on bracket 108;

[0063] The rotating frame 1 has its middle part hinged to the support member 3 at the first hinge point 25. The first end of the rotating frame 1 is provided with a through hole 13, and the axis of the through hole 13 is set in the vertical direction. Specifically, the support member 3 can be rod-shaped, one end of the support member 3 is fixedly connected to the bracket 108, and the first hinge point 25 is located at the other end of the support member 3.

[0064] The trigger rod 2 is located inside the through hole 13 and can slide within the through hole 13.

[0065] When the rotating frame 1 rotates around the first hinge point 25 to the first position, the projection of the trigger rod 2 in the vertical direction at least partially coincides with the projection of the moving frame 103 in the vertical direction; when the rotating frame 1 rotates around the first hinge point 25 to the second position, the projection of the trigger rod 2 in the vertical direction separates from the projection of the moving frame 103 in the vertical direction, that is, they do not overlap; that is, when the moving frame 103 is below the trigger rod 2, if the rotating frame rotates to the first position, the moving frame 103 will contact the trigger rod 2 during its upward movement, thereby driving the trigger rod 2 to move upward; if the rotating frame rotates to the second position, the moving frame 103 will not interfere with the trigger rod 2 during its up-and-down movement.

[0066] Using the above technical solution, when it is necessary to check the fault of the self-cleaning device 100 of the air conditioning unit, firstly, the moving frame 103 is driven to the sensing area of ​​the lower limit switch 107. At this time, the moving frame 103 is located below the horizontal plane where the lower end 24 of the trigger rod 2 is located. At the same time, the lower limit switch 107 sends a signal to the control system, indicating that the moving frame 103 has moved to the starting position. Then, the rotating frame 1 is driven to rotate to the first position, so that the trigger rod 2 is directly above the moving frame 103. Then, the lifting motor 101 is started, so that the moving frame 103 moves upward. During the upward movement of the moving frame 103, the moving frame 103 contacts the lower end 24 of the trigger rod 2 and drives the trigger rod 2 to move upward. When the upper end 23 of the trigger rod 2 moves to the sensing area of ​​the upper limit switch 106, such as Figure 3 As shown, the upper end 23 of the trigger rod 2 can trigger the upper limit switch 106. Therefore, the moving frame 103 does not need to run to the sensing area of ​​the upper limit switch 106 to trigger it, thus effectively reducing the travel and running time of the moving frame 103, thereby reducing the fault inspection time of the air conditioning unit self-cleaning device 100 and improving inspection efficiency. After the fault inspection is completed, the drive rotating frame 1 is rotated to the second position to avoid interference between the moving frame 103 and the trigger rod 2 during the up-and-down movement of the air conditioning unit self-cleaning device 100 during normal operation, which would affect the normal operation of the air conditioning unit self-cleaning device 100.

[0067] Furthermore, it also includes:

[0068] Push rod 4, one end of which is hinged to the second end of rotating frame 1 at the second hinge point 26;

[0069] The drive mechanism 5 has a fixed end and a drive end. The fixed end is hinged to the bracket 108, and the drive end is connected to the other end of the push rod 4. The drive mechanism 5 is used to drive the push rod 4 to perform reciprocating linear motion.

[0070] By adopting the above technical solution, by setting push rod 4 and drive mechanism 5, the drive mechanism 5 can drive the rotating frame 1 to rotate around the first hinge point 25 through push rod 4, thereby realizing the automatic rotation of the rotating frame 1.

[0071] Furthermore, the rotating frame 1, as... Figure 6 As shown, it includes:

[0072] The second end of the rod 11 is hinged to the push rod 4 at the second hinge point 26;

[0073] The fork 12 is fixedly connected to the first end of the rod 11. The fork 12 includes a longitudinal rod 121, an upper crossbar 122 and a lower crossbar 123. The longitudinal rod 121 is vertically arranged and its middle part is connected to the first end of the rod 11. The upper crossbar 122 is fixedly connected to the upper end of the longitudinal rod 121 and the lower crossbar 123 is fixedly connected to the lower end of the longitudinal rod 121. There are two through holes 13, which are respectively opened on the upper crossbar 122 and the lower crossbar 123, and the axes of the two through holes 13 coincide.

[0074] By adopting the above technical solution, by setting the fork 12 so that the trigger rod 2 passes through two through holes 13 with a certain distance between them, the installation of the trigger rod 2 can be more stable, and the structural strength of the rotating frame 1 can also be enhanced.

[0075] Furthermore, the upper part of the trigger rod 2 is provided with an upper locking member 21. The upper locking member 21 is a protrusion that protrudes from the circumferential surface of the trigger rod 2. The upper locking member 21 is located above the upper crossbar 122. The upper locking member 21 is used to restrict the trigger rod 2 from sliding downward when it comes into contact with the upper crossbar 122.

[0076] By adopting the above technical solution and setting the upper locking piece 21, the trigger rod 2 can be prevented from sliding out from below the through hole 13 and falling down.

[0077] Furthermore, the upper part of the trigger rod 2 is provided with an upper pin hole, the axis of the upper pin hole is perpendicular to the axis of the trigger rod 2, and the upper clamp 21 is a pin shaft, which is located in the upper pin hole.

[0078] Furthermore, the distance between the bottom end of the upper clip 21 and the lower end 24 of the trigger rod 2 is less than the distance between the top end of the upper crossbar 122 and the upper limit of the sensing area of ​​the lower limit switch 107.

[0079] Before the rotating frame 1 drives the trigger rod 2 to rotate between the first position and the second position, the moving frame 103 is first controlled to move downward to the sensing area of ​​the lower limit switch 107, and then the rotating frame 1 is controlled to rotate. By adopting the above technical solution, the lower end 24 of the trigger rod 2 can always be located above the moving frame 103 during the rotation of the rotating frame 1, thereby preventing the trigger rod 2 from interfering with the moving frame 103 during the movement, which would cause damage to the device.

[0080] Furthermore, the lower part of the trigger rod 2 is provided with a lower locking member 22, which is a protrusion protruding from the circumferential surface of the trigger rod 2. The lower locking member 22 is located below the lower crossbar 123 and is used to restrict the trigger rod 2 from sliding upward when it comes into contact with the lower crossbar 123.

[0081] By adopting the above technical solution, the lower locking piece 22 can be set to prevent the trigger rod 2 from sliding out from the top of the through hole 13 and falling down.

[0082] Furthermore, the lower part of the trigger rod 2 is provided with a lower pin hole, the axis of the lower pin hole is perpendicular to the axis of the trigger rod 2, and the lower clamp 22 is a pin shaft, which is located in the lower pin hole.

[0083] Furthermore, the distance between the top of the lower locking member 22 and the upper end 23 of the trigger rod 2 is greater than the distance between the bottom of the lower crossbar 123 and the lower limit of the sensing area of ​​the upper limit switch 106.

[0084] By adopting the above technical solution, interference between the lower locking member 22 and the lower crossbar 123 can be prevented during the upward movement of the moving frame 1 and the trigger rod 2. That is, it can be prevented that the lower locking member 22 will contact the bottom of the lower crossbar 123 before the upper end 23 of the trigger rod 2 moves up to the sensing area of ​​the upper limit switch 106, thus preventing the trigger rod 2 from triggering the upper limit switch 106.

[0085] Furthermore, the drive mechanism 5 is a pneumatic cylinder or an electric cylinder.

[0086] Furthermore, the air conditioning unit self-cleaning device 100 also includes a lifting motor 101, which drives the moving frame 103 to move up and down. The limit switch triggering device also includes a control system, which includes:

[0087] The processing module is used to receive signals sent by the upper limit switch 106 and the lower limit switch 107, and to control the operation of the lifting motor 101 and the drive mechanism 5.

[0088] The delay module, electrically connected to the processing module, is used to pause the operation of the hoisting motor 101 for a certain period of time after the processing module receives a signal from the upper limit switch 106 or the lower limit switch 107.

[0089] When the air conditioning unit self-cleaning device 100 cleans the air conditioning unit, it needs to spray cleaning fluid outwards. Since the cleaning fluid can adversely affect the control system, the mechanical components of the self-cleaning device 100 must be placed separately from the control cabinet where the control system is installed. This means that troubleshooting the self-cleaning device 100 requires two operators: one at the control cabinet and the other observing the air conditioning unit to ensure it is functioning correctly. Because the mechanical components of the self-cleaning device 100 are far from the control cabinet, sound transmission is poor. Therefore, sometimes another person needs to relay feedback from the doorway, resulting in troubleshooting requiring 2-3 people. By adopting the above technical solution and setting a delay module, the operator can travel back and forth between the mechanical structure of the air conditioning unit self-cleaning device 100 and the control cabinet during the delay time (i.e., the time when the lifting motor 101 is stopped). This allows the operator to operate the control cabinet and observe whether the air conditioning unit self-cleaning device 100 is working properly. As a result, the fault inspection of the air conditioning unit self-cleaning device 100 can be completed with only one operator, reducing the number of workers required.

[0090] The embodiments of the present invention also disclose a method for fault diagnosis of the self-cleaning device of an air conditioning unit using any of the aforementioned limit switch triggering devices, comprising:

[0091] A1: Rotating frame 1 rotates around the first hinge point 25 to the first position;

[0092] A2: The moving frame 103 moves upward, and the moving frame 103 contacts the lower end 24 of the trigger rod 2, thus driving the trigger rod 2 to move upward;

[0093] A3: The upper end 23 of the trigger lever 2 moves into the sensing area of ​​the upper limit switch 106 and triggers the upper limit switch 106, such as... Figure 3 As shown, it receives the signal sent by the upper limit switch 106;

[0094] A4: The moving frame 103 moves downward, which in turn drives the trigger lever 2 to move downward;

[0095] A5: The moving frame 103 moves into the sensing area of ​​the lower limit switch 107 and triggers the lower limit switch 107, such as Figure 2 As shown, it receives the signal sent by the lower limit switch 107;

[0096] A6: Repeat steps A2 to A5 until all solenoid valves 104 and nozzles 105 electrically connected to the upper limit switch 106 and lower limit switch 107 on the self-cleaning device 100 of the air conditioning unit have been checked.

[0097] Using the above technical solution, when the movable frame 103 moves upward, it can contact the lower end 24 of the trigger rod 2 and drive the trigger rod 2 upward. When the upper end 23 of the trigger rod 2 moves to the sensing area of ​​the upper limit switch 106, the upper end 23 of the trigger rod 2 can trigger the upper limit switch 106, without the movable frame 103 needing to move to the sensing area of ​​the upper limit switch 106 to trigger it. This effectively reduces the travel and running time of the movable frame 103, thereby reducing the fault inspection time of the air conditioning unit self-cleaning device 100 and improving inspection efficiency.

[0098] Furthermore, prior to step A1, the process includes: the movable frame 103 moving downwards to the sensing area of ​​the lower limit switch 107 and triggering the lower limit switch 107, and receiving the signal sent by the lower limit switch 107.

[0099] By adopting the above technical solution, before the rotating frame 1 drives the trigger rod 2 to rotate from the second position to the first position, the moving frame 103 is first controlled to move downward to the sensing area of ​​the lower limit switch 107, so that the moving frame 103 is located below the bottom of the trigger rod 2. Then the rotating frame 1 is controlled to rotate from the second position to the first position. This can prevent the trigger rod 2 and the moving frame 103 from interfering with each other during the rotation of the rotating frame 1, thereby preventing damage to the device.

[0100] Furthermore, between steps A3 and A4, the following steps are also included: the mobile frame 103 stops operating and waits 3-10 seconds before executing the next step; and between steps A5 and A6, the following steps are also included: the mobile frame 103 stops operating and waits 3-10 seconds before executing the next step.

[0101] By adopting the above technical solution and setting a waiting time, the operator can move back and forth between the mechanical structure of the air conditioning unit self-cleaning device 100 and the control cabinet during the waiting time. This allows the operator to both operate the control cabinet and observe whether the air conditioning unit self-cleaning device 100 is working properly. As a result, the fault inspection of the air conditioning unit self-cleaning device 100 can be completed with only one operator, reducing the number of workers required.

[0102] The limit switch triggering device provided by this invention is not limited to the use environment of the self-cleaning device of the air conditioning unit, but can also be used in other use environments for triggering limit switches.

[0103] While the present invention has been illustrated and described with reference to certain preferred embodiments, those skilled in the art should understand that the above description is a further detailed explanation of the invention in conjunction with specific embodiments, and should not be construed as limiting the specific implementation of the invention to these descriptions. Various changes in form and detail can be made by those skilled in the art, including several simple deductions or substitutions, without departing from the spirit and scope of the invention.

Claims

1. A limit switch triggering device, disposed on an air conditioning unit self-cleaning device, the air conditioning unit self-cleaning device comprising: The system comprises a bracket, an upper limit switch and a lower limit switch arranged vertically on the bracket, and a movable frame disposed between the upper limit switch and the lower limit switch, the movable frame being capable of reciprocating between the upper limit switch and the lower limit switch, characterized in that the limit switch triggering device includes: Support components are fixedly mounted on the bracket; A rotating frame, the middle part of which is hinged to the support member at a first hinge point, and a through hole is provided at the first end of the rotating frame, the axis of which is arranged in the vertical direction; A trigger rod is disposed within the through hole, and the trigger rod is capable of sliding within the through hole; When the rotating frame rotates around the first hinge point to the first position, the projection of the trigger rod in the vertical direction at least partially coincides with the projection of the moving frame in the vertical direction; when the rotating frame rotates around the first hinge point to the second position, the projection of the trigger rod in the vertical direction separates from the projection of the moving frame in the vertical direction. The limit switch triggering device further includes: The push rod has one end hinged to the second end of the rotating frame at the second hinge point; The drive mechanism has its fixed end hinged to the bracket, and the drive end of the drive mechanism is connected to the other end of the push rod. The drive mechanism is used to drive the push rod to perform reciprocating linear motion. The rotating frame includes: The rod portion, the second end of which is hinged to the push rod at the second hinge point; The fork is fixedly connected to the first end of the rod. The fork includes a longitudinal rod, an upper crossbar, and a lower crossbar. The middle part of the longitudinal rod is connected to the first end of the rod. The upper crossbar is fixedly connected to the upper end of the longitudinal rod. The lower crossbar is fixedly connected to the lower end of the longitudinal rod. There are two through holes, which are respectively opened on the upper crossbar and the lower crossbar, and the axes of the two through holes coincide.

2. The limit switch triggering device as described in claim 1, characterized in that, The upper part of the trigger rod is provided with an upper locking member, which is a protrusion protruding from the circumferential surface of the trigger rod. The upper locking member is located above the upper crossbar and is used to restrict the trigger rod from sliding downward when it comes into contact with the upper crossbar.

3. The limit switch triggering device as described in claim 2, characterized in that, The upper part of the trigger rod is provided with an upper pin hole, and the upper locking member is a pin shaft, which is located in the upper pin hole.

4. The limit switch triggering device as described in claim 3, characterized in that, The distance between the bottom end of the upper clip and the lower end of the trigger rod is less than the distance between the top end of the upper crossbar and the upper limit of the sensing area of ​​the lower limit switch.

5. The limit switch triggering device as described in claim 1, characterized in that, The trigger rod is provided with a lower locking member at its lower part. The lower locking member is a protrusion that protrudes from the circumferential surface of the trigger rod. The lower locking member is located below the lower crossbar and is used to restrict the trigger rod from sliding upward when it comes into contact with the lower crossbar.

6. The limit switch triggering device as described in claim 5, characterized in that, The lower part of the trigger rod is provided with a lower pin hole, and the lower locking member is a pin shaft, which is located in the lower pin hole.

7. The limit switch triggering device as described in claim 6, characterized in that, The distance between the top of the lower clip and the upper end of the trigger rod is greater than the distance between the bottom of the lower crossbar and the lower limit of the sensing area of ​​the upper limit switch.

8. The limit switch triggering device as described in claim 1, characterized in that, The driving mechanism is a pneumatic cylinder or an electric cylinder.

9. The limit switch triggering device as described in claim 1, characterized in that, The air conditioning unit self-cleaning device also includes a lifting motor for driving the moving frame up and down. The limit switch triggering device also includes a control system, which includes: The processing module is used to receive signals sent by the upper limit switch and the lower limit switch, and to control the operation of the lifting motor and the drive mechanism; The delay module, electrically connected to the processing module, is used to pause the hoisting motor for a certain period of time after the processing module receives a signal from the upper limit switch or the lower limit switch.

10. A method for fault diagnosis of an air conditioning unit's self-cleaning device using a limit switch triggering device as described in any one of claims 1 to 9, characterized in that, include: A1: The rotating frame rotates around the first hinge point to the first position; A2: The moving frame moves upward, contacts the lower end of the trigger rod, and drives the trigger rod to move upward; A3: The upper end of the trigger rod moves into the sensing area of ​​the upper limit switch and triggers the upper limit switch, and receives the signal sent by the upper limit switch; A4: The moving frame moves downwards, causing the trigger rod to move downwards as well; A5: The mobile frame moves into the sensing area of ​​the lower limit switch and triggers the lower limit switch, receiving the signal sent by the lower limit switch; A6: Repeat steps A2 to A5 until all solenoid valves and nozzles electrically connected to the upper and lower limit switches on the self-cleaning device of the air conditioning unit have been checked.

11. The method as described in claim 10, characterized in that, Before step A1, the method further includes: moving the movable frame downwards to the sensing area of ​​the lower limit switch and triggering the lower limit switch, and receiving the signal sent by the lower limit switch.

12. The method as described in claim 10, characterized in that, Between step A3 and step A4, the following steps are also included: the mobile frame stops operating and waits 3-10 seconds before proceeding to the next step; between step A5 and step A6, the following steps are also included: the mobile frame stops operating and waits 3-10 seconds before proceeding to the next step.

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