Air flotation machine

Abstract

The air flotation machine comprises an air flotation tank, a target switch assembly, a control device, a power assembly and a mud scraping plate, the power assembly is arranged on one side of the air flotation tank, the mud scraping plate is fixed to the power assembly and transversely penetrates through the interior of the air flotation tank, the power assembly is used for driving the mud scraping plate to rotate, and the target switch assembly is fixed to the other side of the air flotation tank and transversely penetrates through the interior of the air flotation tank. When the mud scraping plate rotates to be parallel to the base plane of the air floatation tank, the mud scraping plate is in contact with the target switch assembly, and under the condition that the target switch assembly is in contact with the mud scraping plate, a target disconnection signal is sent to the control device; and the control device is used for controlling the motor to continuously run if the target closing signal is determined to be received under the condition that the running time is determined to be greater than or equal to a preset time threshold value, and controlling the motor to stop running until the target disconnecting signal is determined to be received. Therefore, the phenomenon of non-uniform floating sludge enrichment can be avoided, so that the sludge scraping efficiency can be effectively improved, and the failure rate of the air flotation machine is reduced.

Description

Technical Field

[0001] The present disclosure relates to the technical field of sludge treatment devices, and in particular to an air flotation machine. Background Art

[0002] The start and stop of the flotation machine's scraper is controlled by a timer. When the scraper starts running, it scrapes the floating sludge in the flotation tank into the sludge tank and flows into the sludge tank. When the scraper stops running, the floating sludge gradually accumulates in the flotation tank.

[0003] In the prior art, when the timer controls the scraper to stop, the scraper stops at random positions, which may cause uneven accumulation of floating mud, thereby causing problems such as low scraping efficiency and malfunction of the flotation machine. Utility Model Content

[0004] An object of the present disclosure is to provide an air flotation machine.

[0005] A first aspect of the present disclosure provides an air flotation machine, comprising an air flotation tank, a target switch assembly, a control device, a power assembly, and a scraper blade, wherein the power assembly is disposed on one side of the air flotation tank, the scraper blade is fixed to the power assembly and traverses the interior of the air flotation tank, the power assembly is used to drive the scraper blade to rotate, the power assembly includes a motor, the target switch assembly is fixed to the other side of the air flotation tank, when the scraper blade rotates to be parallel to the base surface of the air flotation tank, it contacts the target switch assembly, and the control device is connected to the target switch assembly and the motor respectively;

[0006] The target switch assembly is configured to send a target disconnect signal to the control device when in contact with the scraper blade, and send a target close signal to the control device when not in contact with the scraper blade;

[0007] The control device is used to control the motor to start running and record the running time of the motor when a motor start signal is received. When it is determined that the running time is greater than or equal to a preset time threshold, if it is determined that the target disconnection signal is received, the motor is controlled to stop running; if it is determined that the target closing signal is received, the motor is controlled to continue running until it is determined that the target disconnection signal is received, and the motor is controlled to stop running.

[0008] Optionally, the control device is also used to, when a motor stop signal is received, control the motor to stop running if it is determined that the target disconnection signal is received; and control the motor to continue running if it is determined that the target closing signal is received, until it is determined that the target disconnection signal is received, and control the motor to stop running.

[0009] Optionally, the target switch assembly includes a support base, a first fixing assembly, a second fixing assembly, a third fixing assembly, a fourth fixing assembly, a first support plate, a second support plate, a rocker arm, a contact plate and a metal pressing block;

[0010] The first fixing component is arranged on the support base so that the support base is fixed to one side of the flotation tank. The first support plate is welded to the support base. The rocker arm is arranged on the first support plate through the second fixing component so that the rocker arm can rotate around the second fixing component. The metal pressure block is arranged at the first end of the rocker arm through the third fixing component, and the contact plate is arranged at the second end of the rocker arm through the fourth fixing component.

[0011] Optionally, the target switch assembly further includes an induction component,

[0012] The sensing component is used to collect the position of the metal pressing block, and send a target disconnection signal to the control circuit when the metal pressing block is in contact with the sensing component, and send a target closing signal to the control circuit when the metal pressing block is not in contact with the sensing component.

[0013] Optionally, the target switch assembly further includes an induction component,

[0014] The sensing component is fixed on the second supporting plate through the through hole.

[0015] Optionally, the induction component includes an oscillation circuit, an induction coil and a controller.

[0016] The oscillation circuit is configured to generate a first oscillation frequency when the metal pressing block is not close to the induction coil, and generate a second oscillation frequency when the metal pressing block is close to the induction coil, and send the first oscillation frequency or the second oscillation frequency to the controller;

[0017] The controller is configured to output a target closing signal when receiving the first oscillation frequency, and output a target opening signal when receiving the second oscillation frequency.

[0018] Optionally, the oscillation circuit is configured to generate the second oscillation frequency when the gap between the metal pressing block and the induction coil is within a preset value range.

[0019] Optionally, the control device includes a low-voltage power supply, a target switch, a contactor, and a time relay, the contactor includes a contactor coil, and the time relay includes a normally open contact and a relay coil;

[0020] The coil of the contactor is connected in series with the normally open contact, one end of which is connected to the low-voltage power supply, and the other end is grounded; the first end of the target switch is connected to the low-voltage power supply, the second end of the target switch is connected to the coil of the contactor, one end of the relay coil is connected to the first end of the target switch, and the other end of the relay coil is connected to the coil of the contactor;

[0021] The control device is configured to, upon receiving a motor start signal, energize the relay coil, close the normally open contact, thereby energizing the contactor coil, and cause the time relay to start timing; when the timing duration exceeds a preset time threshold, de-energize the relay coil, and open the normally open contact, thereby de-energizing the contactor coil;

[0022] The control device is further configured to, when a motor stop signal is received or the timing duration is greater than a preset time threshold, control the target switch to close if it is determined that the target closing signal is received so as to energize the coil of the contactor; and control the target switch to open if it is determined that the target disconnecting signal is received so as to de-energize the coil of the contactor.

[0023] Optionally, the control device further includes a normally closed switch,

[0024] A first end of the normally closed switch is connected to the coil of the contactor, and a second end of the normally closed switch is grounded;

[0025] The control device is used to de-energize the coil of the contactor when the normally closed switch is opened.

[0026] Optionally, the normally closed switch is a normally closed button, a sliding normally closed switch, a rotating normally closed switch or a magnetic normally closed switch.

[0027] According to the above technical solution, the flotation machine includes an air flotation tank, a target switch assembly, a control device, a power assembly and a scraper. The power assembly is arranged on one side of the air flotation tank, and the scraper is fixed on the power assembly and crosses the interior of the air flotation tank. The power assembly is used to drive the scraper to rotate. The power assembly includes a motor. The target switch assembly is fixed on the other side of the air flotation tank. When the scraper rotates to be parallel to the base surface of the air flotation tank, it contacts the target switch assembly. The control device is connected to the target switch assembly and the motor respectively; the target switch assembly is used to rotate in contact with the target switch assembly. When the scraper blade contacts the target switch assembly, a target disconnect signal is sent to the control device; when the scraper blade does not contact the target switch assembly, a target close signal is sent to the control device. The control device is configured to, upon receiving a motor start signal, control the motor to start running and record the motor's running time. If the running time is determined to be greater than or equal to a preset time threshold, the motor is controlled to stop running if it is determined that the target disconnect signal has been received; if it is determined that the target close signal has been received, the motor is controlled to continue running until it is determined that the target disconnect signal has been received, at which point the motor is controlled to stop running. In this way, by sending a target disconnect signal to the control device when the scraper blade contacts the target switch assembly, the motor is controlled to stop running, ensuring that the scraper blade's stop position is always parallel to the base surface of the flotation tank. This can avoid uneven accumulation of floating mud, effectively improve scraping efficiency, reduce the failure rate of the flotation machine, and effectively enhance user experience and satisfaction.

[0028] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following detailed description, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0030] Figure 1 is a schematic diagram of an air flotation machine according to an exemplary embodiment of the present disclosure;

[0031] Figure 2 is a schematic diagram of an air flotation machine according to an exemplary embodiment of the present disclosure;

[0032] Figure 3 is a schematic diagram of an induction component according to an exemplary embodiment of the present disclosure;

[0033] Figure 4 FIG. 1 is a schematic diagram of an air flotation machine according to an exemplary embodiment of the present disclosure.

[0034] Description of Reference Numerals

[0035] 101 flotation tank 102 target switch assembly

[0036] 103 control device 104 power assembly

[0037] 1041 motor 105 scraper

[0038] 1021 support base M1 first fixing component

[0039] M2 second fixing assembly M3 third fixing assembly

[0040] M4 fourth fixing assembly 1022 first support plate

[0041] 1023 second support plate 1024 rocker arm

[0042] 1025 contact plate 1026 metal pressing block

[0043] 1027 Inductive component O oscillation circuit

[0044] L induction coil C controller

[0045] E low voltage power supply SQ target switch

[0046] KM contactor KT time relay

[0047] 1025 contact plate NC normally closed switch DETAILED DESCRIPTION

[0048] The following describes the specific embodiments of the present disclosure in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present disclosure and are not intended to limit the present disclosure.

[0049] In this disclosure, unless otherwise indicated, the terms "first" and "second" are used to distinguish one element from another and do not have a sense of order or importance. In addition, when the following description refers to the drawings, the same reference numerals in different drawings represent the same or similar elements, and this disclosure does not repeat them.

[0050] Before introducing the specific embodiments of the present disclosure in detail, the following description will first be given of the application scenarios of the present disclosure. The present disclosure can be applied to the application scenario of the flotation machine's scraper treating sludge. The start and stop of the flotation machine's scraper are controlled by a timer. When the scraper starts running, the scraper scrapes the floating sludge in the flotation tank and flows it into the sludge trough and into the sludge tank. When the scraper stops running, the floating sludge gradually accumulates in the flotation tank. In the prior art, when the timer controls the scraper to stop running, the scraper's stop position is random. When the scraper's stop position is parallel to the base surface of the flotation tank, the floating sludge accumulated in the flotation tank is relatively uniform. When the scraper's stop position is not parallel to the base surface of the flotation tank, the pool surface blocked by the scraper cannot accumulate floating sludge, while the pool surface not blocked by the scraper is smaller. As a result, the pool surface is small, and the accumulated floating sludge is large and thick, resulting in uneven floating sludge enrichment. When the scraper starts running again, it is difficult for the scraper to scrape away the unevenly enriched floating mud. Due to excessive resistance, it may lead to problems such as low scraping efficiency and flotation machine failure.

[0051] In order to solve the above technical problems, the present disclosure provides an air flotation machine, which includes an air flotation tank, a target switch assembly, a control device, a power assembly and a scraper. The power assembly is arranged on one side of the air flotation tank, and the scraper is fixed on the power assembly and crosses the interior of the air flotation tank. The power assembly is used to drive the scraper to rotate. The power assembly includes a motor. The target switch assembly is fixed on the other side of the air flotation tank. When the scraper rotates to be parallel to the base surface of the air flotation tank, it contacts the target switch assembly. The control device is connected to the target switch assembly and the power assembly respectively; the target switch assembly The target switch assembly is configured to send a target disconnect signal to the control device when in contact with the scraper blade, and to send a target close signal to the control device when not in contact with the scraper blade. The control device is configured to control the motor to start running upon receiving a motor start signal and record the motor's running time. If the running time is determined to be greater than or equal to a preset time threshold, the motor is controlled to stop running if it is determined that the target disconnect signal has been received. If it is determined that the target close signal has been received, the motor is controlled to continue running until it is determined that the target disconnect signal has been received, at which point the motor is controlled to stop running. In this way, by sending a target disconnect signal to the control device when the scraper blade contacts the target switch assembly, the motor is controlled to stop running, ensuring that the scraper blade's stop position is always parallel to the base surface of the flotation tank. This prevents uneven accumulation of floating mud, effectively improves scraping efficiency, reduces the failure rate of the flotation machine, and thus effectively enhances user experience and satisfaction.

[0052] Figure 1is a schematic diagram of an air flotation machine according to an exemplary embodiment of the present disclosure; Figure 1 As shown, the flotation machine 100 includes an air flotation tank 101, a target switch assembly 102, a control device 103, a power assembly 104 and a scraper 105. The power assembly 104 is arranged on one side of the air flotation tank 101. The scraper 105 is fixed to the power assembly 104 and crosses the interior of the air flotation tank 101. The power assembly 104 is used to drive the scraper 105 to rotate. The power assembly 104 includes a motor 1041. The target switch assembly 102 is fixed to the other side of the air flotation tank 101. When the scraper 105 rotates to be parallel to the base surface of the air flotation tank 101, it contacts the target switch assembly 102. The control device 103 is connected to the target switch assembly 102 and the motor 1041 respectively.

[0053] The target switch assembly 102 is configured to send a target disconnection signal to the control device 103 when in contact with the scraper blade 105 and send a target closing signal to the control device 103 when not in contact with the scraper blade 105;

[0054] The control device 103 is used to control the motor 1041 to start running when a motor start signal is received, and record the running time of the motor 1041. When it is determined that the running time is greater than or equal to a preset time threshold, if it is determined that the target disconnection signal is received, the motor 1041 is controlled to stop running; if it is determined that the target closing signal is received, the motor 1041 is controlled to continue running until it is determined that the target disconnection signal is received, and the motor 1041 is controlled to stop running.

[0055] The target switch assembly 102 can be a non-contact switch such as an inductive proximity switch and a capacitive proximity switch, or a contact switch such as a limit switch and a rocker switch. The preset time threshold can be set by the operator according to the actual cleaning situation of the flotation machine. The power assembly 104 can also include a scraper chain and a scraper sprocket. After the motor 1041 is started, the power is transmitted to the scraper chain through the scraper sprocket, and the scraper chain drives the scraper fixed on the chain to rotate, scraping the sludge into the sludge tank. The motor start signal can be a start operation instruction from the operator, or a start signal issued by an automatic control system. The running time of the motor 1041 can be recorded by a timer inside the control circuit device or a dedicated timing circuit. The control device 103 is configured to, upon receiving a start signal from the motor 1041, control the motor 1041 to start operation, record the operation time of the motor 1041, and trigger a stop signal for the motor 1041 if the operation time is greater than or equal to a preset time threshold. Upon receiving the stop signal from the motor 1041, if it is determined that the target disconnection signal has been received, control the motor 1041 to stop operation. At this time, the position of the scraper 105 can be determined to be parallel to the base surface of the flotation tank 101. If it is determined that the target closing signal has been received, it can be determined that the position of the scraper 105 is not parallel to the base surface of the flotation tank 101. The motor 1041 is controlled to continue operation until it is determined that the target disconnection signal has been received, at which point the motor 1041 is controlled to stop operation, thereby stopping the rotation of the scraper 105 and ensuring that the scraper 105 stops parallel to the base surface of the flotation tank 101.

[0056] The above technical solution controls the motor to stop running when it is determined that the running time is greater than or equal to the preset time threshold and when it is determined that the target disconnection signal is received, so that the stop position of the scraper is always parallel to the base surface of the flotation tank, thereby avoiding the uneven accumulation of floating mud, thereby effectively improving the scraping efficiency and reducing the failure rate of the flotation machine, thereby effectively improving the user experience and satisfaction.

[0057] Optionally, the control device 103 is also used to, when receiving a stop signal from the motor 1041, control the motor 1041 to stop running if it is determined that the target disconnection signal is received; and control the motor 1041 to continue running if it is determined that the target closing signal is received, until it is determined that the target disconnection signal is received, and control the motor 1041 to stop running.

[0058] The motor 1041 stop signal can be manually triggered, or it can be automatically triggered when the motor 1041 operating time is greater than or equal to a preset time threshold. Upon receiving the motor 1041 stop signal, if the control device 103 determines that the target disconnect signal has been received, the motor 1041 is controlled to stop operating. At this point, the scraper 105 can be determined to be parallel to the base surface of the flotation tank 101. If the target close signal is received, the scraper 105 can be determined to be non-parallel to the base surface of the flotation tank 101. The motor 1041 is controlled to continue operating until the target disconnect signal is received, at which point the motor 1041 is controlled to stop operating, thereby stopping the scraper 105 and ensuring that the scraper 105 stops rotating parallel to the base surface of the flotation tank 101.

[0059] The above technical solution controls the motor to stop running when it is determined that the motor stop signal is received and the target disconnection signal is received, so that the stop position of the scraper is always parallel to the base surface of the flotation tank, thereby avoiding the uneven accumulation of floating mud, thereby effectively improving the scraping efficiency and reducing the failure rate of the flotation machine, thereby effectively improving the user experience and satisfaction.

[0060] Figure 2 is a schematic diagram of an air flotation machine according to an exemplary embodiment of the present disclosure; Figure 2 As shown,

[0061] The target switch assembly 102 includes a support base 1021, a first fixing assembly M1, a second fixing assembly M2, a third fixing assembly M3, a fourth fixing assembly M4, a first support plate 1022, a second support plate 1023, a rocker arm 1024, a contact plate 1025 and a metal pressing block 1026;

[0062] The first fixing component M1 is arranged on the support base 1021 so that the support base 1021 is fixed to one side of the flotation tank 101. The first support plate 1022 is welded to the support base 1021. The rocker arm 1024 is arranged on the first support plate 1022 through the second fixing component M2. The rocker arm 1024 can rotate around the second fixing component. The metal pressure block 1026 is arranged at the first end of the rocker arm 1024 through the third fixing component M3. The rectangular contact plate 1025 is arranged at the second end of the rocker arm 1024 through the fourth fixing component M4.

[0063] The first fixing assembly M1, the second fixing assembly M2, the third fixing assembly M3, and the fourth fixing assembly M4 can be fasteners or connectors, such as bolts, screws, pins, and expansion screws. The first fixing assembly M1, the second fixing assembly M2, the third fixing assembly M3, and the fourth fixing assembly M4 can be one or more. The first support plate can be a triangular support plate or a support plate of other shapes. The second support plate can be a rectangular support plate or a support plate of other shapes. The contact plate can also be a rectangular contact plate or a contact plate of other shapes.

[0064] Alternatively, as Figure 2 As shown, the target switch assembly 102 further includes a sensing component 1027,

[0065] The sensing component 1027 is used to collect the position of the metal pressure block 1026, and send a target disconnection signal to the control circuit when the metal pressure block 1026 is in contact with the sensing component 1027, and send a target closing signal to the control circuit when the metal pressure block 1026 is not in contact with the sensing component 1027.

[0066] When the gap between the metal pressure block 1026 and the sensing component 1027 is within a preset value range, a target disconnection signal is sent to the control circuit; when the gap between the metal pressure block 1026 and the sensing component 1027 is not within the preset value range, a target closing signal is sent to the control circuit.

[0067] Alternatively, as Figure 2 As shown, the target switch assembly 102 further includes a sensing component 1027,

[0068] The sensing component is fixed on the second supporting plate through the through hole.

[0069] Figure 3 is a schematic diagram of an induction component according to an exemplary embodiment of the present disclosure, such as Figure 3 As shown, the induction component 1027 includes an oscillation circuit O, an induction coil L and a controller C.

[0070] The oscillation circuit O is configured to generate a first oscillation frequency when the metal pressing block 1026 is not close to the induction coil L, and generate a second oscillation frequency when the metal pressing block 1026 is close to the induction coil L, and transmit the first oscillation frequency or the second oscillation frequency to the controller C;

[0071] The controller C is configured to output a target closing signal when receiving the first oscillation frequency, and output a target opening signal when receiving the second oscillation frequency.

[0072] The first oscillation frequency can be a stable frequency value, and the second oscillation frequency can be a variable frequency value, and the variable frequency value exceeds a preset frequency threshold. When the gap between the metal pressing block 1026 and the induction coil L is within a preset value range, it can be considered that the metal pressing block 1026 is close to the induction coil L. The oscillation circuit O operates normally when the metal pressing block 1026 is not close to the induction coil L, generating a stable first oscillation frequency; when the metal pressing block 1026 is close to the induction coil L, it generates a variable second oscillation frequency.

[0073] The above technical solution, by generating the first oscillation frequency or the second oscillation frequency through the oscillation circuit and sending the first oscillation frequency or the second oscillation frequency to the controller, can accurately determine the state of the target switch component, thereby providing a basis for accurately determining the position of the scraper.

[0074] Optionally, the oscillation circuit O is configured to generate the second oscillation frequency when the gap between the metal pressing block 1026 and the induction coil L is within a preset value range.

[0075] The preset value range may be 1-2 mm.

[0076] The above technical solution generates a second oscillation frequency when the gap between the metal pressing block 1026 and the induction coil L is within a preset numerical range, which can accurately determine whether the metal pressing block 1026 of the target switch assembly 102 is close to the induction component 1027, thereby providing a basis for accurately determining the position of the scraper 105.

[0077] Figure 4 is a schematic diagram of an air flotation machine according to an exemplary embodiment of the present disclosure, as shown in FIG. Figure 4 As shown, the control device 103 includes a low-voltage power supply E, a target switch SQ, a contactor coil KM, and a time relay KT. The time relay KT includes a normally open contact KT and a relay coil KT;

[0078] The coil KM of the contactor is connected in series with the normally open contact KT, one end of which is connected to the low-voltage power supply E, and the other end is grounded; a first end of the target switch SQ is connected to the low-voltage power supply E, a second end of the target switch SQ is connected to the coil KM of the contactor, one end of the relay coil KT is connected to the first end of the target switch SQ, and the other end of the relay coil KT is connected to the coil KM of the contactor;

[0079] The control device 103 is configured to, upon receiving a start signal from the motor 1041, energize the relay coil KT, close the normally open contact KT, and energize the contactor coil KM, causing the time relay KT to start timing; and when the timing duration exceeds a preset threshold, de-energize the relay coil KT, open the normally open contact KT, and de-energize the contactor coil KM;

[0080] The control device 103 is further configured to, upon receiving a stop signal from the motor 1041 or the timing duration being greater than a preset time threshold, control the target switch SQ to close if it is determined that the target closing signal has been received, so as to energize the coil KM of the contactor; and, upon receiving a target disconnection signal, control the target switch SQ to disconnect, so as to de-energize the coil KM of the contactor.

[0081] Among them, the time relay KT can be a digital time relay, and the on time and off time can be set. It is a time relay with cyclic on and off. The low-voltage power supply E is used to provide a stable DC voltage to the control device 103. The contactor can be an AC contactor or other contactor used to control the on and off of an AC circuit. When the start signal of the motor 1041 is received, the normally open contact KT is controlled to close, the relay coil KT and the coil KM of the contactor are energized, the motor 1041 is controlled to start running, and the power component 104 drives the scraper 105 to rotate. The time relay KT starts timing. When the timing time is greater than a preset threshold, the normally open contact KT is disconnected to de-energize the relay coil KT, control the motor 1041 to stop running, and cause the scraper 105 to stop rotating. Upon receiving a stop signal from the motor 1041 or the timing duration exceeds a preset time threshold, if it is determined that the target closing signal has been received, the target switch SQ is controlled to close, so that the coil KM of the contactor is energized, the motor 1041 is controlled to continue operating, and the power assembly 104 continues to drive the scraper 105 to rotate. If it is determined that the target disconnecting signal has been received, the target switch SQ is controlled to open, so that the coil KM of the contactor is deenergized, the motor 1041 is controlled to stop operating, and the scraper 105 stops rotating.

[0082] The above technical solution can ensure that the scraper blade stops in a horizontal position by controlling the motor to continue to drive the scraper blade to rotate if it is determined that the target closing signal is received or the timing duration is greater than the preset time threshold; and controlling the target switch to disconnect and the motor to stop driving the scraper blade to rotate if it is determined that the target disconnection signal is received.

[0083] Optionally, still with Figure 3 For example, the control device 103 further includes a normally closed switch NC,

[0084] A first end of the normally closed switch NC is connected to the coil KM of the contactor, and a second end of the normally closed switch NC is grounded;

[0085] The control device 103 is configured to de-energize the coil KM of the contactor when the normally closed switch NC is opened.

[0086] The normally closed switch (NC) is a switch that is closed when inactive and opens the circuit only when activated. There are many types of normally closed switches, including push buttons, sliding switches, rotary switches, and magnetic switches. These switches can be non-self-latching. When pressed, they temporarily close the circuit and automatically return to the open state once the button is released.

[0087] Optionally, the normally closed switch NC is a normally closed switch button NC, a sliding normally closed switch NC, a rotating normally closed switch NC or a magnetic normally closed switch NC.

[0088] Among them, the normally closed switch button NC is a manually operated switch, usually used in situations where the circuit needs to be disconnected in a short time. When the button is pressed, the circuit is disconnected; when released, the circuit automatically closes. The sliding normally closed switch NC is a switch that controls the on and off of the circuit by sliding operation. When the sliding normally closed switch NC is slid to the open position, the circuit is disconnected; when it is slid to the closed position, the circuit is closed. The rotating normally closed switch NC is a switch that controls the on and off of the circuit by rotating operation. When the rotating normally closed switch NC is rotated to the open position, the circuit is disconnected; when it is rotated to the closed position, the circuit is closed. The magnetic normally closed switch NC is a switch that controls the on and off of the circuit by magnetic force. When a magnet approaches the magnetic normally closed switch NC, the circuit is closed; when the magnet moves away, the circuit is disconnected.

[0089] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings. However, the present disclosure is not limited to the specific details of the above embodiments. Within the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all fall within the scope of protection of the present disclosure.

[0090] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0091] In addition, the various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. An air flotation machine, characterized in that: The flotation machine includes an air flotation tank, a target switch assembly, a control device, a power assembly and a scraper. The power assembly is arranged on one side of the air flotation tank. The scraper is fixed to the power assembly and crosses the interior of the air flotation tank. The power assembly is used to drive the scraper to rotate. The power assembly includes a motor. The target switch assembly is fixed to the other side of the air flotation tank. When the scraper rotates to be parallel to the base surface of the air flotation tank, it contacts the target switch assembly. The control device is connected to the target switch assembly and the motor respectively. The target switch assembly is configured to send a target disconnect signal to the control device when in contact with the scraper blade, and send a target close signal to the control device when not in contact with the scraper blade; The control device is used to control the motor to start running and record the running time of the motor when a motor start signal is received. When it is determined that the running time is greater than or equal to a preset time threshold, if it is determined that the target disconnection signal is received, the motor is controlled to stop running; if it is determined that the target closing signal is received, the motor is controlled to continue running until it is determined that the target disconnection signal is received, and the motor is controlled to stop running.

2. The air flotation machine according to claim 1, characterized in that: The control device is also used to, when receiving a motor stop signal, control the motor to stop running if it is determined that the target disconnection signal is received, and control the motor to continue running if it is determined that the target closing signal is received, until it is determined that the target disconnection signal is received, and control the motor to stop running.

3. The air flotation machine according to claim 1, characterized in that: The target switch assembly includes a support base, a first fixing assembly, a second fixing assembly, a third fixing assembly, a fourth fixing assembly, a first support plate, a second support plate, a rocker arm, a contact plate and a metal pressing block; The first fixing component is arranged on the support base so that the support base is fixed to one side of the flotation tank. The first support plate is welded to the support base. The rocker arm is arranged on the first support plate through the second fixing component. The rocker arm can rotate around the second fixing component. The metal pressure block is arranged on the first end of the rocker arm through the third fixing component. The contact plate is arranged on the second end of the rocker arm through the fourth fixing component.

4. The air flotation machine according to claim 3, characterized in that: The target switch assembly further includes an induction component, The sensing component is used to collect the position of the metal pressing block, and send a target disconnection signal to the control device when the metal pressing block is in contact with the sensing component, and send a target closing signal to the control device when the metal pressing block is not in contact with the sensing component.

5. The air floatation machine according to claim 3, characterized in that: The target switch assembly further includes an induction component, The sensing component is fixed on the second supporting plate through the through hole.

6. The air floatation machine according to claim 4, characterized in that: The induction component includes an oscillation circuit, an induction coil and a controller. The oscillation circuit is configured to generate a first oscillation frequency when the metal pressing block is not close to the induction coil, and generate a second oscillation frequency when the metal pressing block is close to the induction coil, and send the first oscillation frequency or the second oscillation frequency to the controller; The controller is configured to output a target closing signal when receiving the first oscillation frequency, and output a target opening signal when receiving the second oscillation frequency.

7. The air floatation machine according to claim 6, characterized in that: The oscillation circuit is configured to generate the second oscillation frequency when the gap between the metal pressing block and the induction coil is within a preset value range.

8. The air floatation machine according to claim 1, characterized in that: The control device includes a low-voltage power supply, a target switch, a contactor, and a time relay, wherein the contactor includes a contactor coil, and the time relay includes a normally open contact and a relay coil; The coil of the contactor is connected in series with the normally open contact, one end of which is connected to the low-voltage power supply, and the other end is grounded; the first end of the target switch is connected to the low-voltage power supply, the second end of the target switch is connected to the coil of the contactor, one end of the relay coil is connected to the first end of the target switch, and the other end of the relay coil is connected to the coil of the contactor; The control device is configured to, upon receiving a motor start signal, energize the relay coil, close the normally open contact, thereby energizing the contactor coil, and cause the time relay to start timing; when the timing duration exceeds a preset time threshold, de-energize the relay coil, and open the normally open contact, thereby de-energizing the contactor coil; The control device is further configured to, when a motor stop signal is received or the timing duration is greater than a preset time threshold, control the target switch to close if it is determined that the target closing signal is received so as to energize the coil of the contactor; and control the target switch to open if it is determined that the target disconnecting signal is received so as to de-energize the coil of the contactor.

9. The air floatation machine according to claim 8, characterized in that: The control device also includes a normally closed switch, A first end of the normally closed switch is connected to the coil of the contactor, and a second end of the normally closed switch is grounded; The control device is used to de-energize the coil of the contactor when the normally closed switch is opened.

10. The air floatation machine according to claim 9, characterized in that: The normally closed switch is a button normally closed switch, a sliding normally closed switch, a rotating normally closed switch or a magnetic normally closed switch.

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