Discharge control valve of a vertical mill dust collector

Abstract

The utility model discloses a kind of discharge control valves of vertical mill dust collector.The valve includes vertical unloading pipe, two installation ports are distributed on its two side walls, respectively connect horizontal pipeline, pipeline outer end is sealed by detachable sealing plate.Each pipeline is equipped with a set of independent flap valve mechanism, including pivot shaft driven by hydraulic cylinder through transmission rod and the flap valve door fixed on it.Ring positioning frame with sealing ring is arranged on the inner wall of unloading pipe above installation port, for pressing seal when valve is closed.The utility model forms redundancy seal by two sets of valve mechanism, effectively prevents dust collector air leakage problem caused by single point failure, realizes non-stop maintenance;Valve state is monitored by sensor, and intelligent control unit can realize synchronous, independent control and fault alarm, significantly improve the reliability, sealing property and automation level of discharging system.

Description

Technical Field

[0001] This utility model relates to the technical field of cement dust removal equipment, and in particular to a discharge control valve for a vertical mill dust collector. Background Technology

[0002] Vertical mills generate a large amount of dust during the grinding process, which needs to be collected and treated by a dust collector. The bottom of the dust collector is usually equipped with a discharge valve to intermittently discharge the collected dust material. At the same time, it is necessary to maintain the airtightness of the dust collector to prevent air leakage from affecting the dust collection efficiency.

[0003] Currently, commonly used unloading devices, such as flap valves and rotary valves, mostly employ a single valve plate structure. This structure has significant drawbacks: when the single valve plate fails to close tightly due to a malfunction in the drive mechanism (such as cylinder / hydraulic cylinder failure), a jammed transmission mechanism, or worn seals, air leakage occurs at the bottom of the dust collector, severely disrupting the negative pressure environment inside and leading to a decrease in overall dust collection efficiency. Furthermore, the single valve plate bears the entire impact of the material when closed, resulting in severe wear, a short lifespan, and requiring shutdown for repairs in case of failure, thus affecting production continuity.

[0004] Therefore, there is an urgent need for a discharge control valve that offers more reliable sealing, more stable operation, and the ability to perform maintenance without shutting down the machine. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a discharge control valve for a vertical mill dust collector. It addresses the problem that existing unloading devices using a single valve may fail to close tightly due to drive mechanism malfunction, transmission mechanism jamming, or seal wear, resulting in air leakage at the bottom of the dust collector, severely disrupting the negative pressure environment inside the dust collector, and ultimately reducing overall dust collection efficiency.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A discharge control valve for a vertical mill dust collector includes a vertically arranged discharge pipe. A first installation port and a second installation port are distributed vertically along the height of the two side walls of the discharge pipe, respectively connecting to a horizontal first pipe and a second pipe. The outer ends of the two pipes are sealed by detachable sealing plates. A first flap valve mechanism driven to open and close by a first driving element is provided inside the first pipe, and a second flap valve mechanism driven to open and close by a second driving element is provided inside the second pipe. The two flap valve mechanisms have identical structures and are independently controlled, used to collaboratively or individually cut off the discharge channel of the discharge pipe.

[0007] Furthermore, the flap valve mechanism includes a horizontal pivot shaft, a flap valve fixed on the pivot shaft, and a transmission rod connecting the drive component and the pivot shaft. Both ends of the pivot shaft are rotatably supported on the outer wall of the pipe via bearing seats, with one end being a suspended end fixedly connected to the transmission rod. The drive component is a vertically arranged hydraulic cylinder, with its lower end hinged to a hinge seat on the side wall of the discharge pipe, and its telescopic end hinged to the transmission rod.

[0008] Preferably, a sensor mounting base is provided above the transmission rod, on which a photoelectric switch sensor for detecting the swing position of the transmission rod is mounted to provide real-time feedback on the valve's opening and closing status.

[0009] Preferably, an annular positioning frame is fixed on the inner wall of the unloading pipe above the installation port, and an annular groove is opened on its lower end face. An annular sealing ring is embedded in the groove, which is pressed against the flap valve when it is closed to form a reliable seal.

[0010] Preferably, the sealing plate has an observation port and is equipped with a light-transmitting plate to facilitate observation of the internal working conditions of the pipeline and the position of the valves.

[0011] Preferably, the first pipe has an air inlet at its bottom and an air outlet on the lower side wall of the unloading pipe, and the two are connected by an exhaust pipe with an exhaust control valve. This device can be used to balance the air pressure in the pipe when the valve is opened and closed, reducing the resistance to movement.

[0012] As can be seen from the above technical solutions, this utility model provides a discharge control valve for a vertical mill dust collector. Compared with the prior art, the beneficial effects of this utility model are: 1. This utility model features a double seal, ensuring high reliability. It employs two independently driven flap valve mechanisms to form a two-stage seal. Even if one mechanism fails, the other can still effectively cut off the material discharge channel, preventing air leakage from the dust collector. This allows for maintenance without shutting down the machine, greatly improving the reliability and continuity of equipment operation.

[0013] 2. This utility model has good sealing performance. By setting an annular sealing ring and pressing it tightly against the flap valve, the sealing performance in the closed state is significantly improved, effectively preventing air leakage.

[0014] 3. This utility model uses a photoelectric sensor to monitor the valve position in real time and transmits the signal to the control system, which can realize remote monitoring, fault alarm and intelligent linkage control, thus improving the automation level of the equipment.

[0015] 4. The sealing plate at the outer end of the pipe in this utility model is removable, which facilitates maintenance personnel to maintain and replace internal valves, sealing rings, and other components. The design of the observation window makes daily inspections more convenient.

[0016] 5. The dual-valve design of this utility model distributes the impact and wear of materials, and the setting of the pressure equalization exhaust port reduces the resistance of valve plate movement, which helps to extend the overall service life. Attached Figure Description

[0017] To more clearly illustrate the technical solution of this utility model, the drawings used in the implementation examples will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the present invention; Figure 2 This is a side view of the overall structure of Embodiment 1 of this utility model; Figure 3 The appendix to Embodiment 1 of this utility model Figure 2 A schematic diagram of the AA-line section; Figure 4 The appendix to Embodiment 1 of this utility model Figure 3 A partially enlarged structural diagram of position I; Figure 5 This is a three-dimensional structural diagram of Embodiment 1 of the present utility model; Figure 6 The appendix to Embodiment 1 of this utility model Figure 4 A magnified schematic diagram of the structure at position II.

[0019] In the picture: 1. Unloading pipe; 21. First pipe; 22. Second pipe; 31. First sealing plate; 32. Second sealing plate; 41. First pivot shaft; 51. First flap valve; 61. First shaft seat; 71. First hydraulic cylinder; 81. First transmission rod; 91. Sensor mounting base; 101. Photoelectric switch sensor; 11. Annular positioning frame; 12. Annular sealing ring; 13. Observation port; 14. Light-transmitting plate; 15. Air inlet; 16. Air outlet; 17. Exhaust pipe; 18. Exhaust control valve. Detailed Implementation

[0020] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0021] Example 1: See Figure 1-6A discharge control valve for a vertical mill dust collector includes a vertically arranged discharge pipe 1 with a rectangular cross-section. The discharge pipe 1 is vertically installed at the bottom of the dust collector (not shown in the figure). A first installation port and a second installation port are distributed along the height direction on both side walls of the discharge pipe 1. The first installation port is located above the second installation port. A horizontal first pipe 21 is welded and fixed to the first installation port, and a horizontal second pipe 22 is welded and fixed to the second installation port. The two pipes are arranged horizontally. The outer ends of the first pipe 21 and the second pipe 22 are provided with flange interfaces and are respectively sealed by a detachable first sealing plate 31 and a second sealing plate 32. A first flap valve mechanism driven to open and close by a first driving member 71 is provided in the first pipe 21, and a second flap valve mechanism driven to open and close by a second driving member 72 is provided in the second pipe 22.

[0022] In this embodiment, see Figure 1 The first flap valve mechanism includes a horizontally arranged first pivot shaft 41, a first flap valve 51 fixed on the first pivot shaft 41, and a first transmission rod 81 connecting the first driving member 71 and the first pivot shaft 41. Both ends of the first pivot shaft 41 are rotatably supported on the outer wall of the first pipe 21 via first bearing seats 61. One end of the first pivot shaft 41 is a suspended end and fixedly connected to one end of the first transmission rod 81. The first driving member 71 is a vertically arranged first hydraulic cylinder. The lower end of its cylinder body is hinged to a first hinge seat on the side wall of the unloading pipe 1, and its telescopic end is hinged to the other end of the first transmission rod 81. The lower end of the cylinder body of the first hydraulic cylinder 71 is connected to the first hinge seat welded to the unloading pipe 1 via a pin. Its piston rod (telescopic end) extends downward and is hinged to the other end of the first transmission rod 81 via a pin. Similarly, a second flap valve mechanism driven by a second hydraulic cylinder 72 via a second transmission rod is provided inside the second pipe 22.

[0023] In this embodiment, see Figure 5 , 6 A first sensor mounting base 91 is provided above the first transmission rod 81. A first photoelectric switch sensor 101 for detecting the swing position of the first transmission rod 81 is mounted on the first sensor mounting base 91. Above the first transmission rod 81, a sensor mounting base 91 is welded. The sensor mounting base 91 is an L-shaped plate, on which a photoelectric switch sensor 101 is fixed with screws. The photoelectric switch sensor 101 is a commercially available product, specifically a through-beam photoelectric switch, consisting of a transmitter and a receiver, which are installed in opposite positions. When there is no object obstructing the light, the light emitted by the transmitter directly reaches the receiver; when an object obstructs the light, the intensity of the light received by the receiver is reduced or completely disappears. The receiver determines the presence of an object based on the changes in the received light, sensing whether the swing position of the first transmission rod 81 enters the light sensing area of ​​the photoelectric switch sensor 101, thereby determining whether the first flap valve 51 is in an open or closed state.

[0024] In this embodiment, see Figure 3 , 4 An annular positioning frame 11 is fixed to the inner wall of the unloading pipe 1 above both the first and second mounting ports. A rectangular annular groove is formed on the lower end face of the annular positioning frame 11, and a rectangular annular sealing ring 12 is embedded within the groove. The annular positioning frame 11 is welded and fixed to the inner wall of the unloading pipe 1 at the upper edge of the first mounting port. An annular groove is machined on its lower surface, and a wear-resistant and corrosion-resistant rubber annular sealing ring 12 is embedded within the groove. When the first hydraulic cylinder 71 pushes the first transmission rod 81 to rotate the first flap valve 51 to a horizontal position, the valve plate presses tightly against the annular sealing ring 12, forming an effective seal.

[0025] In this embodiment, see Figure 5 The first sealing plate 31 and the second sealing plate 32 have observation ports 13, and a light-transmitting plate 14 is installed on the observation ports 13. The light-transmitting plate 14 is made of tempered glass.

[0026] In this embodiment, see Figure 3 The first pipe 21 has an air inlet 15 at its bottom and an air outlet 16 on the lower side wall of the unloading pipe 1. The air inlet 15 and the air outlet 16 are connected by an exhaust pipe 17, which is equipped with an exhaust control valve 18. To balance the air pressure, an air inlet 15 is opened at the bottom of the first pipe 21 and an air outlet 16 is opened at the lower part of the unloading pipe 1. The two are connected by a metal exhaust pipe 17, and a manual or pneumatic exhaust control valve 18 is installed on the pipe.

[0027] Understandably, the first flap valve mechanism and the second flap valve mechanism have the same structure and control each other independently to cut off or open the discharge channel of the discharge pipe 1.

[0028] Working process: During normal material discharge, both hydraulic cylinders retract, opening the two flap valves and allowing the material to fall. When it is necessary to stop discharging, the control system issues a command, causing the two hydraulic cylinders to move synchronously, pushing the transmission rod to close the two flap valves and tighten the sealing ring. If the control system receives a signal indicating that the first valve failed to close (specifically, the photoelectric switch sensor 101 detects that the corresponding first transmission rod 81 is blocking the light of the sensor), an alarm will be issued, prompting the operator to check for a malfunction in the first valve. At this time, the second valve can be operated to close separately to maintain the seal, and the first valve can be inspected. Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A discharge control valve for a vertical mill dust collector, comprising a vertically arranged discharge pipe (1), characterized in that: The unloading pipe (1) has a first installation port and a second installation port distributed along its height direction on both side walls. The first installation port is connected to a horizontal first pipe (21), and the second installation port is connected to a horizontal second pipe (22). The outer ends of the first pipe (21) and the second pipe (22) are respectively sealed by a detachable first sealing plate (31) and a second sealing plate (32). The first pipe (21) is provided with a first flap valve mechanism driven to open and close by a first driving member (71), and the second pipe (22) is provided with a second flap valve mechanism driven to open and close by a second driving member (72). The first flap valve mechanism includes a horizontally arranged first pivot shaft (41), a first flap valve (51) fixed on the first pivot shaft (41), and a first transmission rod (81) connecting the first drive member (71) and the first pivot shaft (41); the two ends of the first pivot shaft (41) are rotatably supported on the outer wall of the first pipe (21) through the first bearing seat (61), one end of which is a suspended end and fixedly connected to one end of the first transmission rod (81); the first drive member (71) is a vertically arranged first hydraulic cylinder, the lower end of which is hinged to the first hinge seat on the side wall of the unloading pipe (1), and its telescopic end is hinged to the other end of the first transmission rod (81); A first sensor mounting base (91) is provided above the first transmission rod (81), and a first photoelectric switch sensor (101) for detecting the swing position of the first transmission rod (81) is provided on the first sensor mounting base (91).

2. The discharge control valve for a vertical mill dust collector according to claim 1, characterized in that, An annular positioning frame (11) is fixed on the inner wall of the unloading pipe (1) above the first and second mounting ports. An annular groove is opened on the lower end face of the annular positioning frame (11), and an annular sealing ring (12) is embedded in the annular groove.

3. The discharge control valve for a vertical mill dust collector according to claim 1, characterized in that, The first sealing plate (31) and the second sealing plate (32) have observation openings (13), and a light-transmitting plate (14) is installed on the observation openings (13).

4. The discharge control valve for a vertical mill dust collector according to claim 1, characterized in that, The bottom of the first pipe (21) is provided with an air inlet (15), and the lower end side wall of the unloading pipe (1) is provided with an air outlet (16). The air inlet (15) and the air outlet (16) are connected through an exhaust pipe (17), and an exhaust control valve (18) is provided on the exhaust pipe (17).

5. The discharge control valve for a vertical mill dust collector according to claim 1, characterized in that, The first flap valve mechanism and the second flap valve mechanism have the same structure and are independently controlled to cut off or open the discharge channel of the discharge pipe (1).

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