Adjustable synchronous shaft

Abstract

An adjustable synchronous shaft provided by the present invention includes a rotating shaft and two cam assemblies arranged thereon. An adjusting shaft is arranged on a limit plate, and the adjusting shaft is engaged with a cam ring. When the position of the cam ring needs to be adjusted, the adjusting shaft is rotated, and the adjusting shaft drives the cam ring to rotate, thereby realizing the position adjustment of the cam ring. When the valve body is fully opened or closed, the cam ring accurately triggers the micro switch, so that the control system obtains the accurate switching state of the valve body.

Description

Technical Field

[0001] The present invention relates to a material conveying system of a power plant, and specifically to an adjustable synchronous shaft. Background Art

[0002] The dome valve has technical advantages such as good airtightness, no jamming, high temperature resistance, and soft seal. At present, the charging valves (ash discharge valves) and discharging valves in domestic material conveying systems generally use dome valves, and local control boxes are arranged on-site, and their pneumatic parts are often placed outside the local control box.

[0003] Due to the relatively harsh actual working conditions on-site (high temperature, dust, etc.), the pneumatic parts are easily corroded by fly ash without sealed protection. When there is a slight air leakage in the air circuit, dust easily enters the dome valve cylinder, seriously affecting the normal operation of the dome valve. In addition, there is generally only one feedback signal in the local control box, that is, the inflation pressure signal of the dome valve sealing ring, and there is no full-open and full-close feedback signal of the dome valve. This will form an open-loop control for the dome valve, that is, due to the inability to monitor the actual switch-in-place signal of the valve in time, the dome valve is inflated in advance and the sealing ring is squeezed and broken; and when the sealing ring is damaged, it is impossible to accurately locate, analyze, and prompt the real cause of the damage, that is, whether the damage of the sealing ring is caused by the open feedback or the close feedback. In this way, on-site maintenance personnel cannot make an intuitive judgment, which will inevitably prolong the maintenance time and thus affect the normal operation of the system.

[0004] In view of the existing technical problems, it is necessary to design an adjustable synchronous shaft for accurately detecting the opening and closing states of the dome valve. Summary of the Invention

[0005] Aiming at the problem that the existing local control box cannot monitor the opening or closing state of the dome valve in real time, the present invention provides an adjustable synchronous shaft, which realizes the accurate detection of the opening and closing states of the dome valve and effectively ensures the stable operation of the material conveying system.

[0006] The present invention is realized through the following technical solutions:

[0007] An adjustable synchronous shaft includes a rotating shaft, and two identical cam assemblies and a bottom plate that are sequentially sleeved on the rotating shaft. The bottom plate is located at one end close to the cylinder.

[0008] The cam assembly includes a cam ring, a limiting plate, and an adjusting shaft.

[0009] The inner wall of the cam ring is circumferentially provided with internal teeth. The limiting plate is embedded at one end of the cam ring, and the cam ring can rotate around the limiting plate. The limiting plate is fixedly sleeved on the rotating shaft. The adjusting shaft is arranged on the limiting plate, and one end of it extends into the interior of the cam ring and is meshed with the cam ring. Driving the adjusting shaft to rotate can make the cam ring rotate around the rotating shaft.

[0010] Preferably, a limiting device is further provided on the limiting plate for circumferentially positioning the adjusting shaft.

[0011] Preferably, the adjusting shaft includes a shaft and a gear fixedly sleeved on the shaft. The gear meshes with the internal teeth of the cam ring. An installation hole is provided on the limiting plate. One end of the shaft is arranged in the installation hole, and the shaft can axially move along the installation hole. A gear hole is provided on one side of the installation hole close to the cam ring;

[0012] When adjusting the cam ring, the gear is separated from the gear hole;

[0013] When positioning the cam ring, the gear meshes with the internal teeth of the cam ring. At the same time, the end of the gear is located in the gear hole.

[0014] Preferably, a spring is further sleeved on the adjusting shaft. The spring is used to axially reset the adjusting shaft.

[0015] Preferably, the two cam assemblies are respectively a first cam assembly and a second cam assembly. The cam ring of the second cam assembly contacts the bottom plate; One end of the adjusting shaft is an adjusting end, and the other end is a positioning end;

[0016] Two spring positioning holes are provided on the bottom plate. The positioning end of the adjusting shaft of the first cam assembly extends into the cam ring of the second cam assembly and is connected to the spring. The adjusting end of the adjusting shaft of the second cam assembly extends out of the limiting plate of the first cam assembly.

[0017] Preferably, an embedding step is provided at the top of the cam ring, and the limiting plate is fitted in the embedding step.

[0018] Preferably, the cam ring is of an annular structure, and convex blocks are provided on the outer wall of the cam ring.

[0019] Preferably, one end of the rotating shaft is supported on the housing of the air device. The two cam assemblies are located in the housing. The other end of the rotating shaft is connected to the rotating shaft of the cylinder.

[0020] Compared with the prior art, the present invention has the following beneficial technical effects:

[0021] An adjustable synchronous shaft provided by the present invention includes a rotating shaft and two cam assemblies arranged thereon. By providing an adjusting shaft on the limiting plate, the adjusting shaft meshes with the cam ring. When the position of the cam ring needs to be adjusted, the adjusting shaft is rotated, and the adjusting shaft drives the cam ring to rotate, realizing the position adjustment of the cam ring. When the valve body is fully opened or closed, the cam ring accurately triggers the microswitch, so that the control system obtains the accurate on-off state of the valve body.

[0022] Furthermore, a limiting mechanism is provided on the limiting plate to circumferentially position the adjustment shaft, preventing the cam ring from accidentally rotating during operation and causing false alarms in the control device.

[0023] Furthermore, the adjustment shaft is positioned through the gear hole, which has a simple structure, convenient control, and low processing costs.

[0024] Furthermore, a spring is used to reset the adjustment shaft, and at the same time, the gear is positioned in the gear hole by the elastic force to ensure the effectiveness of the positioning.

[0025] Furthermore, one end of each of the two adjustment shafts is located outside the limiting plate of the first cam assembly, facilitating the operation of the adjustment shaft and improving the adjustment efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is the internal structure diagram of the control system of the present invention;

[0027] Figure 2 is the installation schematic diagram of the control system of the present invention and the valve body;

[0028] Figure 3 is the structural schematic diagram of the synchronization shaft of the present invention;

[0029] Figure 4 is the structural block diagram of the control system of the present invention;

[0030] Figure 5 is the gas circuit structure diagram of the control system of the present invention;

[0031] Figure 6 is the control flow chart of the valve body opening process of the present invention;

[0032] Figure 7 is the control flow chart of the valve body closing process of the present invention.

[0033] In the figure: 1. Housing; 3. Cable lock head; 4. Main control unit; 5. Synchronization shaft; 6. Display unit; 7. Quick exhaust valve; 8. Solenoid valve; 9. Pressure switch; 10. Microswitch; 11. Rotary switch; 12. Bracket; 13. Cylinder; 14. Valve body;

[0034] 22. Rotating shaft; 21. First adjustment shaft; 22. Second adjustment shaft; 23. First limiting plate; 24. First cam ring; 25. Second limiting plate; 26. Second cam ring; 27. Spring; 28. Base plate. DETAILED DESCRIPTION OF THE INVENTION

[0035] The present invention will be further described in detail below with reference to the drawings. The following is an explanation of the present invention rather than a limitation.

[0036] Refer to Figure 1-4, A control system for a dome valve, comprising a control device and a synchronous shaft 5. One end of the synchronous shaft 5 is connected to the control device, and the other end is connected to one end of the rotating shaft of the cylinder 13. The other end of the rotating shaft of the cylinder 13 is connected to the valve body 14. The cylinder 13 is used to drive the opening and closing action of the valve body 14. The synchronous shaft 5 rotates synchronously with the rotating shaft of the cylinder 13. The control device is installed on the cylinder 13 through a bracket 12.

[0037] The control device includes a main control unit, a pneumatic unit, and a signal acquisition unit; the main control unit is respectively connected to the signal acquisition unit and the pneumatic unit, and the pneumatic unit is respectively connected to the cylinder 13 and the inflatable seal ring.

[0038] The signal acquisition unit is used to acquire the opening and closing state of the valve body 14 and the pressure parameters of the inflatable seal ring on the valve body.

[0039] The pneumatic unit is used to control the opening and closing action of the valve body and the inflation and deflation action of the seal ring according to the output signal of the main control unit.

[0040] The main control unit is used to output a valve body opening and closing signal and an inflation and deflation signal according to the opening and closing instruction of the valve body, combined with the opening and closing state of the valve body and the pressure parameters of the inflatable seal ring.

[0041] Refer to Figure 5 , The pneumatic unit includes a solenoid valve 8 and a quick exhaust valve 7 connected to the main control unit. The solenoid valve 8 includes a first solenoid valve and a second solenoid valve.

[0042] Among them, the cylinder 13 is connected to the air source through the first solenoid valve, the inflatable seal ring is connected to the air source through the second solenoid valve, and the quick exhaust valve 7 is connected to the exhaust port of the inflatable seal ring.

[0043] The acquisition unit includes a pressure switch and a micro switch. The pressure switch is arranged on the air path of the inflatable seal ring and is connected to the main control unit for detecting the pressure parameters of the inflatable seal ring.

[0044] The first micro switch and the second micro switch are respectively connected to the main control unit to respectively detect the open / close state of the valve body. The first convex block and the second convex block are arranged in the circumferential direction of the synchronous shaft 5. When the valve body is in the closed state, the first convex block contacts the first micro switch, and the second convex block separates from the other second micro switch. On the contrary, when the valve body is in the open state, the first convex block separates from the first micro switch, and the second convex block contacts the other second micro switch.

[0045] The model of the micro switch is KW12-2.

[0046] The main control unit is arranged in the housing 1. The first micro switch and the second micro switch are arranged in the housing and connected to the main control unit. One end of the synchronizing shaft extends into the housing, and the first bump and the second bump are in the same plane as the two micro switches. When the synchronizing shaft rotates, the first bump and the second bump can alternately trigger the two micro switches.

[0047] The first solenoid valve, the second solenoid valve, the quick exhaust valve 7 and the pressure switch 9 are respectively arranged in the housing. A cable lock 3 and a display unit 6 are also arranged on the side wall of the housing. The display unit 6 is connected to the main control unit 4. A knob switch is also arranged on the side wall of the housing for starting the control system.

[0048] Furthermore, due to the different specifications of the valve bodies, the rotation angles of the valve bodies during opening and closing are different. Therefore, when the first bump and the second bump on the synchronizing shaft are fixed on the synchronizing shaft, only the opening and closing instructions of the valve bodies with corresponding specifications can be detected. At the same time, when there is a deviation in the installation positions of the micro switches and the valve bodies, the first bump and the second bump installed in a fixed form cannot accurately detect the opening and closing states of the valve bodies. To solve this problem, the present invention also designs an adjustable synchronizing shaft. By adjusting the positions of the first bump and the second bump, the synchronizing shaft can be applicable to any kind of valve body and can accurately detect the opening and closing states of the valve body. The specific structure is as follows:

[0049] Refer to again Figure 3 An adjustable synchronizing shaft includes a rotating shaft 20 and two cam assemblies sleeved on the rotating shaft 20, namely a first cam assembly and a second cam assembly.

[0050] The cam assembly includes a cam ring, a limiting plate and an adjusting shaft.

[0051] The cam ring is a ring structure. The bump is arranged on the outer wall of the cam ring. Internal teeth are circumferentially arranged on its inner wall. The limiting plate is embedded at the top of the cam ring, and the cam ring can rotate around the limiting plate. The limiting plate is fixedly sleeved on the rotating shaft. An installation hole is arranged on the limiting plate. The adjusting shaft is arranged on the limiting plate through the installation hole. One end of it extends into the interior of the cam ring, and one end of it is located outside the limiting plate, and the adjusting shaft can move along the axial direction of the cam ring.

[0052] A gear is arranged on the adjusting shaft. The gear is in long-term engagement with the cam ring. Rotating the adjusting shaft is used to adjust the axial position of the cam ring. A positioning mechanism is also arranged on the limiting plate for circumferentially positioning the adjusting shaft.

[0053] When adjusting the position of the bump, move the adjusting shaft to separate the gear of the adjusting shaft from the positioning mechanism, and then rotate the adjusting shaft. Drive the cam ring to rotate through the gear to complete the adjustment of the bump position.

[0054] For example, when the valve is in the closed state, the cam ring is rotated by adjusting the shaft, and then the cam is driven to rotate until the cam triggers the micro switch, completing the adjustment of the cam position.

[0055] Refer to Figure 3 , the first cam assembly includes a first adjustment shaft 22, a first limit plate 23, a first cam ring 24 and a first cam.

[0056] The first limit plate 23 is fixedly sleeved on the rotating shaft 20, the first cam ring 24 is movably sleeved on the rotating shaft, an embedding step is arranged at the end of the first cam ring 24, the first limit plate 23 is fitted in the embedding step, the first adjustment shaft 22 is installed on the first limit plate 23, a gear is arranged on the first adjustment shaft 22, and the gear is constantly meshed with the first cam ring 24.

[0057] The positioning mechanism is a gear hole, the gear hole is located on one side of the installation holes of the first limit plate 23 and the first adjustment shaft 22, and this side is the side close to the first cam ring 24. A spring is sleeved on the end of the first adjustment shaft 22, and the lower end of the spring abuts against the second cam assembly.

[0058] The structure of the second cam assembly is the same as that of the first cam assembly, and the installation method on the rotating shaft is also the same. The second cam assembly includes a second adjustment shaft 23, a second limit plate 25 and a second cam ring 26. A bottom plate 28 is further arranged at the bottom of the second cam assembly. The bottom plate 28 is fixedly sleeved on the rotating shaft, an embedding step is arranged at the end of the second cam ring 26, and the bottom plate 28 is fitted in the embedding step.

[0059] The end of the first cam ring 24 abuts against the second limit plate 25. The end of the first adjustment shaft 22 passes through the second limit plate 25 and extends into the second cam ring 26, and abuts against the bottom plate 28 through a spring 27.

[0060] One end of the second adjustment shaft 22 abuts against the bottom plate 28 through a spring 27, and the other end passes through the second limit plate 25 and the first limit plate 23 in sequence and is located outside the first limit plate 23.

[0061] Slots are arranged at the ends of the first adjustment shaft 21 and the second adjustment shaft 22 outside the first limit plate 23. The tool is stuck in the slots, which is convenient for driving the pressing adjustment shaft and driving the adjustment shaft to rotate.

[0062] During adjustment, press the adjustment shaft, the spring is compressed, the gear of the adjustment shaft is separated from the gear hole, rotate the adjustment shaft under the compressed state, the adjustment shaft drives the cam ring to rotate through the gear, realizing the adjustment of the cam position. When the cam contacts the micro switch, the adjustment is completed. Release the adjustment shaft, and the adjustment shaft resets under the action of the spring. The gear of the adjustment shaft enters the gear hole, the gear of the adjustment shaft meshes with the gear hole, and at the same time meshes with the internal teeth of the cam ring, restricting the rotation of the cam ring.

[0063] The control method of a control system for a dome valve provided by the present invention will be described in detail below.

[0064] Refer to Figure 6 and 7 , a control method of a control system for a dome valve, including a control method for closing the valve body and a control method for opening the valve body:

[0065] The control method for closing the valve body includes the following steps:

[0066] Step 101, the main control unit outputs an action instruction for the first solenoid valve according to the valve closing instruction;

[0067] Step 102, the first solenoid valve controls the cylinder to rotate, the cylinder drives the valve body to close, and the synchronous shaft rotates synchronously with the valve body;

[0068] Step 103, when the valve body is closed, the first bump triggers the corresponding microswitch, and the main control unit outputs an action instruction for the second solenoid valve according to the feedback signal of the microswitch;

[0069] When the main control unit does not receive the feedback signal of the microswitch, delay for a predetermined time. After delaying for the predetermined time, if the main control unit receives the feedback signal of the microswitch, input the action instruction of the second solenoid valve; after delaying for the predetermined time, if the feedback signal of the microswitch is still not received, the main control unit outputs an alarm signal and the valve body stops operating;

[0070] Step 104, the second solenoid valve controls the inflation of the inflation seal ring;

[0071] Step 105, the pressure switch detects the pressure of the inflation seal ring. When the set pressure is reached, the valve body closing is completed;

[0072] When the pressure of the inflation seal ring does not reach the set pressure, after delaying for a predetermined time, if the set pressure is reached, the valve body closing is completed; after delaying for the predetermined time, if the set pressure is still not reached, the main control unit outputs a signal indicating that the inflation seal ring is damaged and the valve body stops operating.

[0073] The process of opening the valve body includes the following steps:

[0074] Step 201, the main control unit outputs an action instruction for the quick exhaust valve 7 according to the valve opening instruction, and the quick exhaust valve exhausts;

[0075] Step 202, the main control unit obtains the pressure parameter of the inflation seal ring collected by the pressure switch;

[0076] When the pressure parameter is less than the preset pressure, execute Step 203;

[0077] When the pressure parameter is greater than the preset pressure, delay for a predetermined time. When the pressure parameter is less than the preset pressure, execute Step 203;

[0078] When the pressure parameter is still greater than the preset pressure after the delay for the preset time, the main control unit inputs an alarm signal and the valve stops operating.

[0079] Step 203: The main control unit outputs an action instruction for the first solenoid valve. The first solenoid valve controls the rotation of the cylinder, and the cylinder drives the valve body to open, and the synchronous shaft rotates synchronously with the valve body.

[0080] Step 204: When the second bump triggers the corresponding microswitch, the valve body opens.

[0081] When the main control unit does not receive the feedback signal from the microswitch, a preset time is delayed. After the preset time is delayed, if the main control unit receives the feedback signal from the microswitch, the valve body opens; after the preset time is delayed and the feedback signal from the microswitch is still not received, the main control unit outputs an alarm signal and the valve body stops operating.

[0082] A control system and a control method for a dome valve provided by the present invention are used for the electric control part of the dome valve in a material conveying system. When the valve is opened or closed, first, the "open / close feedback" signal and the "seal ring pressure" signal on the synchronous shaft are collected, and then after the main control unit analyzes, logically calculates, statistically processes, and delays these signals, control instructions are output to perform actions such as opening and closing the valve and charging and discharging air from the seal ring; at the same time, a fault display LED indicator is integrated on the circuit board, which can quickly prompt the type of fault, and through the operation display unit on the side, the actual state of the valve can be monitored in real time.

[0083] This control system is safe, reliable, simple to operate, and convenient for operation and maintenance. It solves the problems that the damage of the seal ring of the dome valve cannot be accurately located in time, the pneumatic and electric controls are isolated from each other without integration, and there is no real-time monitoring on site. It can realize the intelligent control of the dome valve and the real-time monitoring of the valve state, which is convenient for on-site debugging and later maintenance, effectively extends the service life of the dome valve, and fully ensures the reliable and stable operation of the material conveying system.

[0084] This control device integrates the pneumatic part and the electric control part in a sealed housing, isolating them from the harsh working conditions outside, which can fully ensure the stable and reliable operation of the precision components. Secondly, the developed integrated synchronous shaft is used, which is self-equipped with a spring buckle mechanism, which is not only convenient for adjusting the open / close feedback in one operation plane, but also can firmly lock these signals. In addition, the "open / close feedback" signal and the "seal ring pressure" signal of the valve are introduced into the control loop, and the AI intelligent control of the dome valve is realized through the CPU, memory, integrated circuit, etc. in the control unit. At the same time, through the logical calculation, analysis, and statistics of the feedback state and valve instructions of the valve by the control unit, the type of valve fault is accurately located. Finally, by receiving the signals sent by the control unit in real time, the actual state of the valve is transmitted to the operation display unit.

[0085] The above content is only for explaining the technical idea of the present invention, and the protection scope of the present invention cannot be limited thereby. Any modification made on the basis of the technical solution according to the technical idea proposed by the present invention falls within the protection scope of the claims of the present invention.

Claims

1. An adjustable synchronous shaft, characterized in that: It includes a rotating shaft, two cam assemblies with the same structure and a bottom plate which are sequentially sleeved on the rotating shaft, and the bottom plate is located at one end close to the cylinder; The cam assembly comprises a cam ring, a limit plate and an adjustment shaft; The inner wall of the cam ring is circumferentially provided with internal teeth, a limit plate is embedded in one end of the cam ring, and the cam ring can rotate around the limit plate, the limit plate is fixedly sleeved on the rotating shaft, the adjustment shaft is arranged on the limit plate, one end of which extends into the interior of the cam ring and is meshed with the cam ring, and the cam ring can be rotated around the rotating shaft by driving the adjustment shaft to rotate; The limiting plate is also provided with a limiting device for circumferentially positioning the adjustment shaft; The adjustment shaft comprises a shaft and a gear fixedly sleeved on the shaft, the gear meshes with the inner teeth of the cam ring, a mounting hole is provided on the limit plate, one end of the shaft is provided in the mounting hole, and the shaft can move along the axial direction of the mounting hole, and a gear hole is provided on a side of the mounting hole close to the cam ring; When the cam ring is adjusted, the gear separates from the gear hole; When the cam ring is positioned, the gear meshes with the internal teeth of the cam ring, and at the same time, the end of the gear is located in the gear hole; The two cam assemblies are respectively a first cam assembly and a second cam assembly, and the cam ring of the second cam assembly is in contact with the bottom plate; one end of the adjustment shaft is an adjustment end, and the other end is a positioning end; Two spring positioning holes are provided on the bottom plate, the positioning end of the adjusting shaft of the first cam assembly extends into the cam ring of the second cam assembly and is connected to the spring, the regulating end of the adjusting shaft of the second cam assembly extends out of the limit plate of the first cam assembly, the positioning end of the adjusting shaft of the second cam assembly is connected to the spring, and the spring is used to axially reset the adjusting shaft.

2. The adjustable synchronous shaft according to claim 1, characterized in that: An embedding step is arranged on the top of the cam ring, and the limiting plate is assembled in the embedding step.

3. The adjustable synchronous shaft according to claim 1, characterized in that: The cam ring is an annular structure, and a convex block is arranged on the outer wall of the cam ring.

4. The adjustable synchronous shaft according to claim 1, characterized in that: One end of the rotating shaft is supported on the housing of the control device, two cam assemblies are located in the housing, and the other end of the rotating shaft is connected to the rotating shaft of the cylinder.

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