Pressure loss protection device and powder loading system

Abstract

The utility model discloses a pressure loss protection device and a powder loading system, and relates to the field of powder loading, the pressure loss protection device is internally provided with a switch module, a pressure detection device and a controller, because the pressure of an air source pipeline of the powder loading device is related to whether a flap valve and a gate valve can be successfully closed or not, the pressure detection device can be used for detecting whether the flap valve and the gate valve can be successfully closed or not; according to the scheme, the pressure detection device is used for detecting the pressure signal at the air source pipeline in real time, when the pressure corresponding to the pressure signal is smaller than the preset pressure threshold value, the controller can control the switch module to be switched off, then the electromagnetic valve coil connected with the switch module is powered off, and the piston connected with the electromagnetic valve moves backwards; therefore, when the pressure of the air source pipeline is reduced to the preset pressure threshold value, the flap valve and the gate valve are controlled to be closed in time, and the situation that the flap valve and the gate valve are closed slowly or even cannot be closed due to the fact that the pressure of compressed air in the air source pipeline is too small is avoided.

Description

Technical Field

[0001] The utility model relates to the field of powder material loading, in particular to a pressure loss protection device and a powder material loading system. Background Art

[0002] In the prior art, the structure of the powder loading device is as follows Figure 1 As shown, when the bulk tanker enters the loading position (i.e., the tanker's feed port is directly below the bulk telescopic head), the tanker driver activates the traction mechanism by pressing the traction-down button on the ultrafine powder loading control cabinet, causing the bulk telescopic head to automatically descend. When the bulk telescopic head's unloading cone contacts the vehicle's feed port, the rope release switch automatically limits the traction mechanism's descent, preparing the tanker for loading. At this point, the dust collector, flap valve, and gate valve start buttons, along with the Roots blower, are activated in sequence to begin loading. When the tank truck is full of powder, the loader operates the stop button to close the flap valve, the gate valve and the Roots blower. At this time, the unloading stops and the loading process is completed. However, since the opening and closing of the flap valve and the gate valve during the powder loading process need to be controlled by the open and stop buttons to control whether the solenoid valve coil connected to them is energized. When it is necessary to control the powder to stop falling, it is necessary to press the stop button to deenergize the solenoid valve coil. At this time, the compressed air in the air source pipeline connected to the solenoid valve will enter the front chamber of the cylinder through the solenoid valve, pushing the piston connected to the solenoid valve. The piston moves backward, and the flap valve and the plug valve rotate in the opposite direction to the horizontal position, cutting off the powder from falling. However, if the compressed air pressure in the air source pipeline is too low, the piston will not be able to move backward, and the flap valve and the plug valve will not be able to rotate in the opposite direction to the horizontal position. The flap valve and the plug valve will close slowly or even fail to close. This will cause a large amount of powder to leak out of the discharge cone hopper in a short period of time and cannot be controlled. This not only poses a certain safety hazard to the loaders, but also has a huge impact on environmental hygiene. A lot of manpower and material resources will be required for cleaning up in the later stage. Therefore, how to avoid the safety and environmental problems of loading in the depressurized state is of great significance. Utility Model Content

[0003] The purpose of the present utility model is to provide a pressure loss protection device and a powder loading system. The present scheme uses a pressure detection device to detect the pressure signal at the gas source pipeline in real time. When the pressure corresponding to the pressure signal is less than a preset pressure threshold, the controller will control the switch module to shut down, thereby de-energizing the solenoid valve coil connected to the switch module, causing the piston connected to the solenoid valve to move backward, and then timely controlling the flap valve and the plug valve to close when the pressure of the gas source pipeline is reduced to the preset pressure threshold, thereby avoiding the situation where the flap valve and the plug valve close slowly or even cannot close due to the pressure of the compressed air in the gas source pipeline being too low.

[0004] In order to solve the above technical problems, the utility model provides a pressure loss protection device, comprising: a switch module, a pressure detection device and a controller;

[0005] The pressure detection device is connected to the air source pipeline of the powder loading device and is used to collect the pressure signal at the air source pipeline;

[0006] The first end of the stop button is connected to the power supply, and the second end is connected to the static contact of the normally open contact of the first intermediate relay;

[0007] The first end of the start button is connected to the second end of the stop button;

[0008] The first end of the switch module is connected to the second end of the start button and the movable contact of the normally open contact of the first intermediate relay, and the second end is connected to the first coil of the first intermediate relay and the first end of the coil of the solenoid valve;

[0009] The second end of the first coil of the first intermediate relay and the second end of the coil of the solenoid valve are both connected to the ground;

[0010] The controller is connected to the pressure detection device and the control end of the switch module respectively, and is used to control the switch module to be turned off when the pressure corresponding to the pressure signal is less than a preset pressure threshold.

[0011] Optionally, the controller includes: a pressure transmitter and an intelligent measurement and control instrument;

[0012] The pressure transmitter is connected to the pressure detection device and is used to convert the pressure signal into a corresponding analog signal;

[0013] The intelligent measuring and controlling instrument is connected to the control end of the switch module, and is used to control the switch module to be closed when the pressure corresponding to the analog signal is less than the preset pressure threshold.

[0014] Optionally, the switch module includes:

[0015] a second coil, having a first end connected to the controller and a second end grounded, and configured to receive an electrical signal transmitted by the controller when the pressure corresponding to the pressure signal is less than a preset pressure threshold, and control the movable contact of the normally closed contact to disconnect from the static contact of the normally closed contact;

[0016] The movable contact of the normally closed contact is connected to the first coil of the first intermediate relay and the first end of the coil of the solenoid valve respectively;

[0017] The static contact of the normally closed contact is respectively connected to the second end of the start button and the moving contact of the first normally open contact of the first intermediate relay.

[0018] Optionally, the switch module includes:

[0019] a controllable switch, wherein a control end of the controllable switch is connected to the controller, a first end of the controllable switch is connected to the power supply, and a second end of the controllable switch is connected to the first end of the third coil, and is configured to receive an electrical signal transmitted by the controller and disconnect the controllable switch when the pressure corresponding to the pressure signal is less than a preset pressure threshold;

[0020] The third coil has a first end connected to the controller and a second end grounded, and is used to control the movable contact of the normally closed contact to be disconnected from the static contact of the normally closed contact after the controllable switch is disconnected;

[0021] The movable contact of the normally closed contact is connected to the first coil of the first intermediate relay and the first end of the coil of the solenoid valve respectively;

[0022] The static contact of the normally closed contact is respectively connected to the second end of the start button and the moving contact of the first normally open contact of the first intermediate relay.

[0023] Optionally, also include:

[0024] An alarm module is connected to the controller and is used to issue a corresponding alarm when the pressure corresponding to the pressure signal is less than a preset pressure threshold.

[0025] Optionally, the alarm module is a sound alarm module and / or a display alarm module.

[0026] Optionally, also include:

[0027] A filtering device is provided between the pressure detection device and the controller.

[0028] Optionally, the filtering device is a capacitor.

[0029] In order to solve the above technical problems, the present invention also provides a powder loading system, comprising: the pressure loss protection system and the powder loading device as described above, wherein the pressure loss protection system is connected to the powder loading device.

[0030] Optionally, the powder loading device includes: a dust collector, a Roots blower, a flap valve, a conveying chute, a plug valve, an air filling tank, a discharge cone hopper, a stop button, a start button, a first intermediate relay, a solenoid valve, and a piston;

[0031] The Roots blower is connected to the aeration tank;

[0032] The plug valve is connected to the inflation groove, and the second end is connected to the flap valve;

[0033] The conveying chute is respectively connected to the flap valve, the dust collector and the discharge cone hopper;

[0034] The first end of the stop button is connected to the power supply, and the second end is connected to the first end of the start button;

[0035] The static contact of the normally open contact of the first intermediate relay is connected to the second end of the stop button, and the second end is connected to the first end of the coil of the first intermediate relay and the first end of the solenoid valve coil respectively;

[0036] The second end of the start button is connected to the first end of the coil of the first intermediate relay and the first end of the coil of the solenoid valve respectively;

[0037] The second end of the coil of the first intermediate relay is connected to the ground;

[0038] The second end of the solenoid valve coil is connected to the ground;

[0039] The normally open contact of the solenoid valve coil is connected to the piston;

[0040] The pistons are connected to the plug valve and the flap valve respectively.

[0041] The purpose of the present invention is to provide a pressure loss protection device and a powder loading system. The pressure loss protection device is provided with a switch module, a pressure detection device and a controller. Considering that the pressure of the air source pipeline of the powder loading device is related to whether the flap valve and the plug valve can be successfully closed, the present scheme uses the pressure detection device to detect the pressure signal at the air source pipeline in real time. When the pressure corresponding to the pressure signal is less than the preset pressure threshold, the controller will control the switch module to shut down, thereby making the solenoid valve coil connected to the switch module lose power, so that the piston connected to the solenoid valve moves backward, and then when the pressure of the air source pipeline is reduced to the preset pressure threshold, the flap valve and the plug valve are controlled to close in time, so as to avoid the situation where the flap valve and the plug valve close slowly or even cannot close due to the pressure of the compressed air in the air source pipeline being too low. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0043] Figure 1 This is a structural diagram of an existing powder loading system provided by the utility model;

[0044] Figure 2 A schematic structural diagram of a pressure loss protection device provided by the utility model;

[0045] Figure 3 The present invention provides a structural diagram of an improved powder loading system. DETAILED DESCRIPTION

[0046] The core of the present utility model is to provide a pressure loss protection device and a powder loading system. The present scheme uses a pressure detection device to detect the pressure signal at the gas source pipeline in real time. When the pressure corresponding to the pressure signal is less than the preset pressure threshold, the controller will control the switch module to shut down, thereby de-energizing the solenoid valve coil connected to the switch module, causing the piston connected to the solenoid valve to move backward, and then timely controlling the flap valve and the plug valve to close when the pressure of the gas source pipeline is reduced to the preset pressure threshold, thereby avoiding the situation where the flap valve and the plug valve close slowly or even cannot close due to the pressure of the compressed air in the gas source pipeline being too low.

[0047] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0048] Please refer to Figure 2 , Figure 2 This is a schematic diagram of the structure of a pressure loss protection device provided by the present invention. The pressure loss protection device includes: a switch module 1, a pressure detection device 2 and a controller 3;

[0049] The pressure detection device 2 is connected to the gas source pipeline of the powder loading device and is used to collect the pressure signal at the gas source pipeline;

[0050] The first end of the stop button is connected to the power supply, and the second end is connected to the static contact of the normally open contact of the first intermediate relay;

[0051] The first end of the start button is connected to the second end of the stop button;

[0052] The first end of the switch module 1 is connected to the second end of the start button and the movable contact of the normally open contact of the first intermediate relay, and the second end is connected to the first coil of the first intermediate relay and the first end of the coil of the solenoid valve;

[0053] The second end of the first coil of the first intermediate relay and the second end of the coil of the solenoid valve are both connected to the ground;

[0054] The controller 3 is connected to the pressure detection device 2 and the control end of the switch module 1 respectively, and is used to control the switch module 1 to be turned off when the pressure corresponding to the pressure signal is less than a preset pressure threshold.

[0055] In the present invention, considering that in the prior art, when the solenoid valve controlled by the Anton stop button loses power, the compressed air in the air source pipeline connected to the solenoid valve will enter the front chamber of the cylinder through the solenoid valve, pushing the piston connected to the solenoid valve backward, and the flap valve and the plug valve will rotate in reverse to a horizontal position, thus cutting off the falling of the powder. However, if the pressure of the air in the air source pipeline is not enough, the gas entering the front chamber of the cylinder will not push the piston backward, and the flap valve and the plug valve will not rotate in reverse to a horizontal position, so this solution sets a pressure detection device 2, which collects the pressure signal of the air source pipeline in real time through the pressure detection device 2, that is, detects the pressure of the air source pipeline in real time, and controls the switch module 1 to shut down when the controller 3 determines that the pressure corresponding to the pressure signal is less than the preset pressure threshold, wherein the first end of the switch module 1 is respectively connected to the second end of the start button and the moving contact of the normally open contact of the first intermediate relay, and the second The ends are respectively connected to the first coil of the first intermediate relay and the first end of the coil of the solenoid valve, that is, the switch module 1 is arranged in the power supply circuit of the solenoid valve coil, so when the controller 3 determines that the pressure corresponding to the pressure signal is less than the preset pressure threshold, the switch module 1 is controlled to be turned off, and the solenoid valve can be turned off in time, and then the compressed air in the air source pipeline enters the front chamber of the cylinder through the solenoid valve in time, pushing the piston connected to the solenoid valve backward, and the linkage flap valve and the plug valve rotate in the opposite direction to the horizontal position, cutting off the falling of the powder, and preventing the failure of cutting off the falling of the powder due to too low air pressure in the air source pipeline.

[0056] It should be noted that the tanker driver controls the powder drop by pressing the stop button, which deenergizes the solenoid valve coil. Compressed air then flows through the valve body into the cylinder's front chamber, pushing the piston backward and causing the flap valve to rotate in the opposite direction to the horizontal position, thus cutting off the material drop. Field simulation tests have shown that when the air pressure is between 0.15 and 0.25 MPa, the flap valve closes slowly when the stop button is pressed. However, when the air pressure is less than 0.15 MPa, the flap valve fails to close. It can be seen that the pressure of the air compressor system-gas source pipeline is an important process control variable for realizing the opening / closing of the flap valve. The first step to realize the pressure loss interlocking protection during the loading process is to collect and dynamically monitor the pressure of the gas source pipeline in real time. The collected pressure signal is transmitted to the controller 3. By setting the pressure threshold in advance, the analog signal is converted into a switching signal through the built-in control module of the intelligent controller, driving the switch module 1 to control the power on / off of the cylinder solenoid valve coil, that is, the opening and closing of the flap valve, realizing the interlocking of the opening and closing state of the flap valve with the gas source pressure of the loading system, and ensuring the loading safety under the pressure loss state.

[0057] It's also important to note that at the inlet of the powder loading system's air source pipeline, the same air source is connected to a pressure transmitter, typically a BLD-801K model. This pressure transmitter converts the pressure signal into a 4-20mA analog signal, which is then input into the intelligent single-loop measurement and control instrument via a circuit. The intelligent single-loop measurement and control instrument is powered by AC220V 50Hz with an accuracy of 0.5%FS. The lower pressure limit of the air source pipeline, which affects the opening and closing of the flap valve, is 0.25MPa. Considering the powder loading station is far from the air compressor, if the air compressor system fails and shuts down, the air source pressure at the loading station will drop rapidly. To provide a margin, the lower pressure threshold of the single-loop measurement and control instrument is set to 0.3MPa. Once the input gas source pressure is lower than 0.3Mpa, the pressure simulation signal passes through the built-in calculation control module of the intelligent single-loop measurement and control instrument, and through the interlocking, it gives the switch module 1 an action signal, driving the intermediate relay to control the cylinder solenoid valve coil to lose power. When the gas source pressure can still meet the normal operation of the system, the cylinder piston is pushed to close the flap valve in time.

[0058] It should also be noted that the high-pressure air duct of the powder loading system is connected to the electric contact pressure gauge in the post-grinding laboratory after passing through the air tee. Since the threshold for the normal start-up of the pneumatic valve is about 0.2Mpa, the lower limit of the pressure gauge is set to 0.3Mpa. When the air compressor fails or the air supply system fails, the pressure in the air source pipeline gradually decreases until it reaches the alarm lower limit of 0.3Mpa. The active contact (power common end) of the electric contact pressure gauge is connected to the lower limit contact, the relay is activated and self-locked, and its normally open contact closes to drive the sound and light alarm to operate, reminding the on-duty personnel to pay attention to the air supply system failure, stop the loading operation in time or check and restart the air compressor to avoid powder leakage.

[0059] The present embodiment provides a pressure loss protection device, which is provided with a switch module 1, a pressure detection device 2 and a controller 3. Considering that the pressure of the air source pipeline of the powder loading device is related to whether the flap valve and the plug valve can be successfully closed, the present scheme uses the pressure detection device 2 to detect the pressure signal at the air source pipeline in real time. When the pressure corresponding to the pressure signal is less than the preset pressure threshold, the controller 3 will control the switch module 1 to shut down, thereby de-energizing the solenoid valve coil connected to the switch module 1, causing the piston connected to the solenoid valve to move backward, and then timely controlling the flap valve and the plug valve to close when the pressure of the air source pipeline is reduced to the preset pressure threshold, thereby avoiding the situation where the flap valve and the plug valve close slowly or even cannot close due to the pressure of the compressed air in the air source pipeline being too low.

[0060] Based on the above embodiment:

[0061] As an optional embodiment, the controller 3 includes: a pressure transmitter and an intelligent measurement and control instrument;

[0062] The pressure transmitter is connected to the pressure detection device 2 and is used to convert the pressure signal into a corresponding analog signal;

[0063] The intelligent measuring and controlling instrument is connected to the control end of the switch module 1 and is used to control the switch module 1 to be closed when the pressure corresponding to the analog signal is less than a preset pressure threshold.

[0064] In the present invention, the controller 3 includes a pressure transmitter and an intelligent measuring and controlling instrument, wherein the function of the pressure transmitter is to convert the pressure signal into a corresponding analog signal, and the intelligent measuring and controlling instrument controls the switch module 1 to close when the pressure corresponding to the analog signal is less than a preset pressure threshold, thereby ensuring the integrity of the control process.

[0065] As an optional embodiment, the switch module 1 includes:

[0066] a second coil, wherein a first end of the second coil is connected to the controller 3 and a second end is grounded, and is configured to receive an electrical signal transmitted by the controller 3 when the pressure corresponding to the pressure signal is less than a preset pressure threshold, and control the movable contact of the normally closed contact to disconnect from the static contact of the normally closed contact;

[0067] The movable contact of the normally closed contact is connected to the first coil of the first intermediate relay and the first end of the coil of the electromagnetic valve respectively;

[0068] The static contact of the normally closed contact is connected to the second end of the start button and the moving contact of the first normally open contact of the first intermediate relay respectively.

[0069] In the present utility model, the switch module 1 includes a second coil and a normally closed contact. When the pressure corresponding to the pressure signal is less than the preset pressure threshold, the second coil will receive the electrical signal transmitted by the controller 3. At this time, the moving contact of the normally closed contact and the static contact of the normally closed contact are disconnected, thereby de-energizing the coil of the solenoid valve, so that the compressed air in the air source pipeline connected to the solenoid valve enters the front chamber of the cylinder through the solenoid valve, pushing the piston connected to the solenoid valve backward, and linking the flap valve and the plug valve to rotate in the opposite direction to a horizontal position, thereby cutting off the falling of the powder. Because the coil is sensitive to the electrical signal, the solenoid valve coil can be controlled to lose power more quickly.

[0070] As an optional embodiment, the switch module 1 includes:

[0071] a controllable switch, wherein a control end of the controllable switch is connected to the controller 3, a first end is connected to a power supply, and a second end is connected to the first end of the third coil, and is configured to receive an electrical signal transmitted by the controller 3 and disconnect the controllable switch when the pressure corresponding to the pressure signal is less than a preset pressure threshold;

[0072] a third coil, a first end of the third coil being connected to the controller 3 and a second end being grounded, for controlling the disconnection of the movable contact of the normally closed contact and the static contact of the normally closed contact after the controllable switch is disconnected;

[0073] The movable contact of the normally closed contact is connected to the first coil of the first intermediate relay and the first end of the coil of the electromagnetic valve respectively;

[0074] The static contact of the normally closed contact is connected to the second end of the start button and the moving contact of the first normally open contact of the first intermediate relay respectively.

[0075] In the present utility model, a controllable switch, a third coil and a corresponding normally closed contact are provided in the switch module 1. When the pressure corresponding to the pressure signal is less than the preset pressure threshold, the controllable switch will receive the electrical signal transmitted by the controller 3. At this time, the controllable switch is disconnected. Because the controllable switch is provided on the power supply circuit of the third coil, the third coil will lose power at this time, thereby disconnecting the moving contact of the normally closed contact and the static contact of the normally closed contact. Because the normally closed contact is provided on the power supply circuit of the solenoid valve, when the moving contact of the normally closed contact and the static contact of the normally closed contact are disconnected, the coil of the solenoid valve loses power, so that the compressed air in the air source pipeline connected to the solenoid valve enters the front chamber of the cylinder through the solenoid valve, pushing the piston connected to the solenoid valve backward, and the linked flap valve and the plug valve rotate in reverse to a horizontal position, cutting off the falling of the powder. By controlling the controllable switch to disconnect, the coil of the solenoid valve can be controlled to lose power, thereby improving the efficiency of the solution.

[0076] It should be noted that after adding the switch module 1, the controller 3 and the pressure detection device 2, the circuit diagram of the powder loading system is as follows: Figure 3 As shown, SB1 is the stop button, SB2 is the start button, YV is the solenoid valve coil, the two KA1s are the coil of the first relay and the normally open contact of the first relay, the two KA2s are the third coil and the normally closed contact in the switch module 1, and K3 is the controllable switch in the switch module 1.

[0077] As an optional embodiment, the method further includes:

[0078] The alarm module is connected to the controller 3 and is used to issue a corresponding alarm when the pressure corresponding to the pressure signal is lower than a preset pressure threshold.

[0079] In the present utility model, an alarm module is also provided in the pressure loss protection device. When the controller 3 determines that the pressure corresponding to the pressure signal is less than the preset pressure threshold, the alarm module will be controlled to issue an alarm to promptly remind the user that the air pressure in the air source pipeline is insufficient, so that maintenance personnel can perform maintenance as soon as possible, so as to facilitate the subsequent powder loading process and improve the reliability of the solution.

[0080] As an optional embodiment, the alarm module is a sound alarm module and / or a display alarm module.

[0081] In the present invention, the alarm module can adopt a sound alarm module, that is, when the controller 3 determines that the pressure corresponding to the pressure signal is less than the preset pressure threshold, a sound alarm is issued; similarly, the alarm module can also adopt a display alarm module, that is, when the controller 3 determines that the pressure corresponding to the pressure signal is less than the preset pressure threshold, a display alarm is issued; the alarm module can also adopt a sound alarm module and a display alarm module, that is, when the controller 3 determines that the pressure corresponding to the pressure signal is less than the preset pressure threshold, a sound alarm and a display alarm are issued. By using sound alarms and / or display alarms, the user can be more clearly reminded that the air pressure in the air source pipeline is insufficient at this time.

[0082] As an optional embodiment, the method further includes:

[0083] The filtering device is arranged between the pressure detection device 2 and the controller 3.

[0084] In the present invention, because the pressure detection device 2 transmits the pressure signal to the controller 3 after collecting the pressure signal of the gas source pipeline, considering that the pressure signal is easily interfered by the outside world during the transmission process, thereby causing inaccurate subsequent pressure determination of the gas source pipeline, this solution newly adds a filtering device between the pressure detection device 2 and the controller 3. The pressure signal collected by the pressure detection device 2 is filtered by the filtering device, thereby reducing the interference of the pressure signal during transmission and improving the accuracy of the solution.

[0085] As an optional embodiment, the filtering device is a capacitor.

[0086] In the present invention, the capacitor is used as the filtering device in consideration of the characteristics of the capacitor, such as extremely small leakage current, good storage property, long life, small capacity error, small size, large capacity, good high-frequency characteristics, good frequency stability, small loss, high precision, resistance to high voltage and large current impact, excellent electrical performance, high reliability and self-healing performance.

[0087] The present invention also provides an embodiment corresponding to the powder loading system, comprising: the above-mentioned pressure loss protection system and the powder loading device, wherein the pressure loss protection system is connected to the powder loading device.

[0088] As an optional embodiment, the powder loading device includes: a dust collector, a Roots blower, a flap valve, a conveying chute, a plug valve, an air filling tank, a discharge cone hopper, a stop button, a start button, a first intermediate relay, a solenoid valve, and a piston;

[0089] The Roots blower is connected to the aeration tank;

[0090] The plug valve is connected to the inflation tank, and the second end is connected to the flap valve;

[0091] The conveying ramp is connected to the flap valve, dust collector and discharge cone hopper respectively;

[0092] The first end of the stop button is connected to the power supply, and the second end is connected to the first end of the start button;

[0093] The static contact of the normally open contact of the first intermediate relay is connected to the second end of the stop button, and the second end is connected to the first end of the coil of the first intermediate relay and the first end of the solenoid valve coil respectively;

[0094] The second end of the start button is connected to the first end of the coil of the first intermediate relay and the first end of the coil of the solenoid valve respectively;

[0095] A second end of the coil of the first intermediate relay is connected to the ground;

[0096] The second end of the solenoid valve coil is connected to the ground;

[0097] The normally open contact of the solenoid valve coil is connected to the piston;

[0098] The pistons are connected to the plug valve and the flap valve respectively.

[0099] The powder loading system provided in this embodiment corresponds to the above-mentioned pressure loss protection device, so it has the same beneficial effects as the above-mentioned pressure loss protection device. Therefore, for the embodiments of the powder loading system, please refer to the description of the embodiments of the pressure loss protection device, which will not be repeated here.

[0100] It should be noted that when the start button is pressed, the coil of the first relay and the solenoid valve coil are energized, and the moving contact of the normally open contact of the first relay and the static contact of the normally open contact are closed. At this time, the start button is released in time. Due to the existence of the normally open contact of the first relay, the coil of the first relay and the solenoid valve coil are still energized until the stop button is pressed, which greatly reduces the complexity of the powder loading operation and is more convenient for practical use.

[0101] It should also be noted that the powder loading system provided by this solution can remotely monitor the gas source pipeline, and automatically generate an audible and visual alarm to remind the on-duty personnel when an abnormality occurs; at the same time, a pressure loss protection device is added to the original powder loading system. When the air pressure drops to the pressure setting threshold, the controller 3 drives the switch module 1 to control the cylinder solenoid valve coil, so that the flap valve is automatically closed, thereby ensuring loading safety in the pressure loss state.

[0102] It should be noted that, in this specification, relational terms such as first and second, etc. are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprises", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0103] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A pressure loss protection device, characterized in that: include: Switch modules, pressure detection devices and controllers; The pressure detection device is connected to the air source pipeline of the powder loading device and is used to collect the pressure signal at the air source pipeline; The first end of the stop button is connected to the power supply, and the second end is connected to the static contact of the normally open contact of the first intermediate relay; The first end of the start button is connected to the second end of the stop button; The first end of the switch module is connected to the second end of the start button and the movable contact of the normally open contact of the first intermediate relay, and the second end is connected to the first coil of the first intermediate relay and the first end of the coil of the solenoid valve; The second end of the first coil of the first intermediate relay and the second end of the coil of the solenoid valve are both connected to the ground; The controller is connected to the pressure detection device and the control end of the switch module respectively, and is used to control the switch module to be turned off when the pressure corresponding to the pressure signal is less than a preset pressure threshold.

2. The undervoltage protection device according to claim 1, characterized in that: The controller includes: a pressure transmitter and an intelligent measuring and controlling instrument; The pressure transmitter is connected to the pressure detection device and is used to convert the pressure signal into a corresponding analog signal; The intelligent measuring and controlling instrument is connected to the control end of the switch module, and is used to control the switch module to be closed when the pressure corresponding to the analog signal is less than the preset pressure threshold.

3. The undervoltage protection device according to claim 1 or 2, characterized in that: The switch module includes: a second coil, having a first end connected to the controller and a second end grounded, and configured to receive an electrical signal transmitted by the controller when the pressure corresponding to the pressure signal is less than a preset pressure threshold, and control the movable contact of the normally closed contact to disconnect from the static contact of the normally closed contact; The movable contact of the normally closed contact is connected to the first coil of the first intermediate relay and the first end of the coil of the solenoid valve respectively; The static contact of the normally closed contact is respectively connected to the second end of the start button and the moving contact of the first normally open contact of the first intermediate relay.

4. The undervoltage protection device according to claim 1 or 2, characterized in that: The switch module includes: a controllable switch, wherein a control end of the controllable switch is connected to the controller, a first end of the controllable switch is connected to the power supply, and a second end of the controllable switch is connected to the first end of the third coil, and is configured to receive an electrical signal transmitted by the controller and disconnect the controllable switch when the pressure corresponding to the pressure signal is less than a preset pressure threshold; The third coil has a first end connected to the controller and a second end grounded, and is used to control the movable contact of the normally closed contact to be disconnected from the static contact of the normally closed contact after the controllable switch is disconnected; The movable contact of the normally closed contact is connected to the first coil of the first intermediate relay and the first end of the coil of the solenoid valve respectively; The static contact of the normally closed contact is respectively connected to the second end of the start button and the moving contact of the first normally open contact of the first intermediate relay.

5. The undervoltage protection device according to claim 1, characterized in that: Also includes: An alarm module is connected to the controller and is used to issue a corresponding alarm when the pressure corresponding to the pressure signal is less than a preset pressure threshold.

6. The undervoltage protection device according to claim 5, characterized in that: The alarm module is a sound alarm module and / or a display alarm module.

7. The undervoltage protection device according to claim 1, characterized in that: Also includes: A filtering device is provided between the pressure detection device and the controller.

8. The undervoltage protection device according to claim 7, characterized in that: The filtering device is a capacitor.

9. A powder loading system, characterized in that: include: The pressure loss protection device and powder loading device according to any one of claims 1 to 8, wherein the pressure loss protection device is connected to the powder loading device.

10. The powder loading system according to claim 9, characterized in that: The powder loading device includes: a dust collector, a Roots blower, a flap valve, a conveying chute, a plug valve, an air filling tank, a discharge cone hopper, a stop button, a start button, a first intermediate relay, a solenoid valve, and a piston; The Roots blower is connected to the aeration tank; The plug valve is connected to the inflation groove, and the second end is connected to the flap valve; The conveying chute is respectively connected to the flap valve, the dust collector and the discharge cone hopper; The first end of the stop button is connected to the power supply, and the second end is connected to the first end of the start button; The static contact of the normally open contact of the first intermediate relay is connected to the second end of the stop button, and the second end is connected to the first end of the coil of the first intermediate relay and the first end of the solenoid valve coil respectively; The second end of the start button is connected to the first end of the coil of the first intermediate relay and the first end of the coil of the solenoid valve respectively; The second end of the coil of the first intermediate relay is connected to the ground; The second end of the solenoid valve coil is connected to the ground; The normally open contact of the solenoid valve coil is connected to the piston; The pistons are connected to the plug valve and the flap valve respectively.

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