An electric discharge valve for hot mill

Abstract

The electric discharge valve of the hot mill of the present invention comprises a valve body, a bracket, a rocker arm, a rotating shaft, a valve, a wear-resistant sleeve, a wear-resistant bushing, an outer flange cover, a baffle, an electric push rod, etc. The electric push rod is instructed by a computer in an operating room to execute a forward extension or backward contraction action, thereby driving the rocker arm to swing, and the rotating shaft rotates with the swing of the rocker arm, thereby finally driving the valve opening to change. A wear-resistant bushing is arranged in the inner hole of the valve body, and both ends of the rotating shaft are respectively mounted in the mounting hole of the mounting flange through a first wear-resistant sleeve and a second wear-resistant sleeve to prevent equipment wear. The first limit baffle and the second limit baffle on the outer end surface of the valve body mounting flange can not only protect the valve, but also provide a limit effect. The discharge amount of the hot mill is controlled by automatically controlling the valve opening of the discharge valve through the electric actuator. The structure is simple, the performance is reliable, the operation and maintenance are convenient, the safety is reliable, and the working efficiency and production efficiency of the equipment are improved.

Description

Technical Field

[0001] The invention relates to an electric discharge valve device for a discharge port of a hot mill used for preparing fibers on a medium (high) density fiberboard production line. Background Art

[0002] The core equipment of the medium and high density fiberboard pulping production line is the thermal mill. A discharge valve device is usually provided at the outlet of the thermal mill. The fiber in the grinding chamber of the thermal mill is discharged to the dryer through the valve port and the blow pipe through the discharge valve device together with the steam. The discharge valve device in the prior art generally adopts a manual discharge valve, which drives the fan-shaped worm gear to rotate through a hand-cranked joystick (worm), and the fan-shaped worm gear drives the rotating shaft to rotate through the keyway, and finally transmits the power to the valve, and controls the opening of the discharge port of the discharge valve through the valve rotation, controls the discharge amount of the thermal mill, and then controls the production capacity of the thermal mill. During the operation of the manual discharge valve, the operator needs to enter the production area to operate the equipment on site, and the opening control of the discharge valve can only be adjusted according to the operator's operating experience. The operation is inconvenient, the control accuracy is not high, and there are safety hazards. After working for a period of time, the tooth surface of the fan-shaped worm gear and the worm is easy to wear, the maintenance workload is large, and the cost investment is high, which affects the equipment working efficiency and production efficiency. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide an electric discharge valve for a hot mill which can automatically control the valve opening of the discharge valve through an electric actuator, has a simple structure, reliable performance, is easy to operate and maintain, and realizes remote automatic control.

[0004] The electric discharge valve for a hot mill of the present invention comprises a discharge valve body, and mounting flanges are arranged at both ends of the valve body. The characteristics are as follows: a rotating shaft is installed in the space between the mounting flanges at both ends of the valve body, and both ends of the rotating shaft are respectively mounted in the mounting holes of the mounting flanges at both ends of the valve body, and one end of the rotating shaft extends outward from the mounting flange and is fixedly connected to the valve; a bracket is fixedly connected to the outside of the valve body, an electric push rod is hingedly installed on the bracket, a swing rod is hingedly connected to the lower end of the electric push rod, and the lower end of the swing rod is fixedly connected to the middle of the rotating shaft;

[0005] The cross section of the valve is in the shape of a ",", and its cross section contour line includes an arc shape located on one side and a curve shape located on the other side, wherein the lower section of the curve shape contour is an inclined guide surface parallel to the axis, and the arc shape contour is an inclined surface intersecting with the end surface and the circumferential surface at the same time;

[0006] The first limit baffle and the second limit baffle are fixedly mounted on the outer end surface of the mounting flange of the valve body connected to the valve, the outer contour line of the first limit baffle is an arc shape, and the inner contour line is a curve shape adapted to the valve; the inner and outer sides of the second limit baffle are both arc-shaped;

[0007] A scale plate is provided on the outer circumferential surface of the mounting flange of the valve body connected to the valve at a position corresponding to the swing amplitude of the swing rod, and a numerical mark of 0-100% is engraved on the scale plate;

[0008] The lower end of the swing rod is connected with the square shaft section of the rotating shaft through a square hole, a first locking nut is arranged at the outer end of the rotating shaft, and a second locking nut is arranged between the swing rod and the mounting flange on the other side of the valve body relative to the valve;

[0009] The two ends of the rotating shaft are respectively mounted in the mounting holes of the mounting flange through the first wear-resistant sleeve and the second wear-resistant sleeve, and the first wear-resistant sleeve and the second wear-resistant sleeve are fixedly connected to the rotating shaft through screws;

[0010] A limit stop ring capable of limiting and blocking between the swing rod and the end face of the mounting flange is arranged on the outer circumferential surface of the first wear-resistant sleeve, and a first O-type sealing ring is arranged between the outer circumferential surface of the first wear-resistant sleeve and the mounting hole of the valve body;

[0011] The valve body is fixedly connected with an outer flange cover on the outside of the mounting flange at the other end of the valve, a wear-resistant bushing is arranged in the body hole of the valve body, a limited step hole is arranged in the body hole of the valve body, a limited boss is arranged on the outer circumferential surface of the wear-resistant bushing, the wear-resistant bushing is positioned and installed in the body hole of the valve body through the limited boss and the limited step hole, and the outer flange cover cooperates with the outer end surface of the wear-resistant bushing to limit the position;

[0012] A second O-ring is provided between the inner side of the outer flange cover and the outer end surface of the wear-resistant bushing;

[0013] The bracket is arranged upwardly at an angle from one side of the valve body, and the lower ends of the two sides of the bracket are fixedly connected to the flanges at both ends of the valve body by welding; the tail of the electric push rod is hingedly connected to the mounting seat at the top of the bracket through the first pin shaft and the first cotter pin; the front end of the electric push rod is hingedly connected to the upper end of the rocker arm through the second pin shaft and the second cotter pin.

[0014] The electric discharge valve of the present invention is used for a hot mill. The computer in the operating room instructs the electric push rod to execute the forward extension or backward contraction action, thereby driving the swing arm to swing, and the rotating shaft rotates with the swing of the swing arm, thereby finally driving the valve opening to change. A wear-resistant bushing is arranged in the inner hole of the valve body, and the two ends of the rotating shaft are respectively mounted in the mounting hole of the mounting flange through the first wear-resistant sleeve and the second wear-resistant sleeve to prevent equipment wear. The first limit baffle and the second limit baffle on the outer end surface of the valve body mounting flange can protect the valve and provide a limiting effect at the same time. The discharge amount of the hot mill is controlled by automatically controlling the valve opening of the discharge valve through the electric actuator. The structure is simple, the performance is reliable, the operation and maintenance are convenient, safe and reliable, the service life of the equipment is extended, remote automatic control is realized, the investment of manpower and material costs is saved, and the working efficiency and production efficiency of the equipment are improved.

[0015] Has the following effects:

[0016] 1. The manual discharge valve is inconvenient to operate and needs to be operated on site, while the electric discharge valve of the present invention can realize online automatic control;

[0017] 2. The worm gear and worm of the manual discharge valve are prone to wear and tear, and need to be replaced regularly, which is troublesome. However, the electric discharge valve of the present invention eliminates the worm gear and worm structure and adopts an electric push rod, which improves the operation stability;

[0018] 3. The electric discharge valve of the present invention has a guide angle, which effectively guides the direction of the material ejected from the valve body, while also reducing the wear of the valve itself and increasing the service life of the valve itself;

[0019] 4. Two crescent-shaped baffles are provided at the discharge port of the electric discharge valve of the present invention, which can protect the valve and reduce its wear, and also reduce the impact of the ejected material and steam on the subsequent spraying pipe;

[0020] 5. The electric discharge valve of the present invention is equipped with a scale plate on the valve body surface, which can not only perform online real-time control in the control room, but also visually see the opening of the discharge valve at the equipment operation site;

[0021] 6. Compared with the manual discharge valve, it has a simple structure, low maintenance cost, convenient maintenance and operation, low operating cost, and improves the equipment's operating rate;

[0022] 7. The electric discharge valve of the present invention can control the valve opening by electrical appliances, thereby realizing automatic feedback and automatic control of the discharge volume and the grinding chamber pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 1 is a schematic diagram of the planar structure of an electric discharge valve used for a thermal mill according to an embodiment of the present invention;

[0024] Figure 2 yes Figure 1 A schematic cross-sectional structure diagram of ;

[0025] Figure 3 yes Figure 1 Another schematic diagram of the AA cross-sectional structure in the horizontal direction.

[0026] In the figure: 101. scale plate; 102. valve; 1021. guide surface; 1022. inclined surface; 103. first limit baffle; 104. first screw; 105. second limit baffle; 106. second screw; 107. bracket; 108. electric push rod; 109. first pin shaft; 110. first cotter pin; 111. second pin shaft; 112. second cotter pin; 113. rocker arm; 114. valve body; 115. first wear-resistant sleeve; 116. first O-ring; 117. first locking nut; 118. wear-resistant bushing; 119. third screw; 120. second O-ring; 121. second wear-resistant sleeve; 122. rotating shaft; 123. outer flange cover; 124. second locking nut. DETAILED DESCRIPTION

[0027] like Figure 1 As shown, an electric discharge valve for a hot mill has a main structure of a conventional discharge valve device for a hot mill in a medium- and high-density fiberboard pulping production line, that is, the discharge valve is a conventional valve body 114 with mounting flanges at both ends; based on the valve body 114 of the conventional discharge valve, firstly, a rotating shaft 122 is installed outside the valve body 114 in a space between the mounting flanges at both ends, and the specific installation structure of the rotating shaft 122 is as follows: mounting holes penetrating the mounting flanges are respectively provided on the mounting flanges at both ends of the valve body 114, the right end of the rotating shaft 122 extends through the mounting holes to the outside of the right mounting flange, and is fixedly connected to the valve 102, and the outer end of the rotating shaft is limitedly locked by a first locking nut 117; the left end of the rotating shaft 122 is flush with the outer end face of the left mounting flange, and an outer flange cover 123 is provided on the outer side of the mounting flange for limiting and blocking, and the outer flange cover 123 is fixedly connected to the outer end face of the mounting flange by a third screw 119.

[0028] A bracket 117 is fixedly installed on the outside of the valve body 114, and the overall installation direction of the bracket 117 is inclined upward from one side of the valve body; the bracket 117 includes left and right side plates, a top plate and a middle reinforcing rib plate, and the lower ends of the left and right side plates are respectively fixedly connected to the outer circumferential surfaces of the mounting flanges at the left and right ends of the valve body by welding. In order to adapt to the limitations of the equipment installation space, the shape of the left side plate can be set as an inclined plate according to the characteristics of the space; a fork-shaped mounting seat is fixedly installed inside the top plate of the bracket 117, and the mounting seat is hingedly connected to the electric push rod 108 through the first pin shaft 109 and the first cotter pin 110, and the front end of the electric push rod 108 is hingedly connected to the rocker arm 113 through the second pin shaft 111 and the second cotter pin 112. A square mounting hole is set at the lower end of the rocker arm 113, and a square shaft section is set in the middle of the rotating shaft 122. The lower end of the rocker arm is fixedly connected with the square shaft section of the rotating shaft through the square hole.

[0029] The right end of the rotating shaft 122 is mounted in the mounting hole of the mounting flange on the right side of the valve body through the first wear-resistant sleeve 115, and the left end of the rotating shaft 122 is mounted in the mounting hole of the mounting flange on the right side of the valve body through the second wear-resistant sleeve 121. The first wear-resistant sleeve and the second wear-resistant sleeve are fixedly connected to the rotating shaft 122 by screws; half of the outer diameter of the first wear-resistant sleeve 115 is larger than the other half of the outer diameter, so that a limit retaining ring structure is formed on the outer circumferential surface of the first wear-resistant sleeve 115, and the limit retaining ring of the first wear-resistant sleeve is limited and blocked between the swing rod and the end face of the mounting flange; the second locking nut 124 is set at the position of the rotating shaft 122 on the left side of the swing rod, and is locked by the first locking nut 117 and the second locking nut 124;

[0030] An outer flange cover 123 is fixedly connected to the outer side of the mounting flange on the left side of the valve body 104, a wear-resistant bushing 118 is arranged in the inner hole of the valve body 104, a limiting boss is arranged on the outer circumferential surface of the wear-resistant bushing 118, and a limiting step hole is arranged on the inner hole of the valve body 104. The wear-resistant bushing 118 is positioned and installed inside the inner hole of the valve body 104 through the limiting boss and the limiting step hole, and the outer flange cover 123 cooperates with the outer end surface of the wear-resistant bushing 118 for limiting.

[0031] The first wear-resistant sleeve 115, the second wear-resistant sleeve 121 and the wear-resistant bushing 118 are all made of non-metallic wear-resistant materials. The first wear-resistant sleeve 115, the second wear-resistant sleeve 121 and the wear-resistant bushing 118 block the wear of the valve body and metal parts, thereby reducing the workload of equipment maintenance, reducing cost investment, and improving equipment work efficiency and production efficiency.

[0032] Furthermore, a first O-ring is provided between the outer circumferential surface of the first wear-resistant sleeve 115 and the mounting hole of the valve body 104, and a second O-ring is provided between the inner side of the outer flange cover 123 and the wear-resistant bushing 118 and the outer end surface, which can effectively prevent leakage of materials.

[0033] Furthermore, the cross-section of the valve 102 is approximately in the shape of a "," and its cross-sectional contour includes an arc shape on one side and a curve shape on the other side, wherein the lower section of the curve shape contour is an inclined guide surface 1021 parallel to the axis, and the arc shape contour is an inclined surface 1022 that intersects with both the end surface and the circumferential surface, which can provide guidance for the material sprayed out of the valve body, reduce the wear of the valve and the valve body, and extend the service life. It has been verified in practice that after the inclined surface 1022 is added, neither the valve nor the valve body will be worn.

[0034] Furthermore, a crescent-shaped first limit baffle 103 and a second limit baffle 105 are fixedly installed on the outer end surface of the right end mounting flange of the valve body 114 connected to the valve 102. The outer contour line of the first limit baffle 103 is an arc shape, and the inner contour line is a curve shape adapted to the valve 102; the inner and outer contour lines of the second limit baffle 105 are both inferior arc shapes; the first limit baffle 103 and the second limit baffle 105 can not only effectively protect the valve 102 and extend the service life of the valve, but also play a limiting role to ensure that the valve 102 rotates within a certain angle range, thereby protecting the electric push rod 108 from working within a certain stroke.

[0035] A scale plate 101 is arranged on the outer circumference of the right end mounting flange of the valve body 114 connected to the valve within a position range adapted to the swing amplitude of the swing rod 113. The scale plate is engraved with 0-100% numerical marks, which can intuitively display the opening size of the valve.

[0036] Specific steps:

[0037] The bracket 107 of the electric discharge valve is welded to the valve body 114 at a certain angle. The first wear-resistant sleeve 115 made of non-metallic material and the second wear-resistant sleeve 121 made of non-metallic material are respectively embedded in the left and right flanges of the valve body 114. The outer ring of the second wear-resistant sleeve 121 is provided with a first O-ring 116. The rotating shaft 122 is installed on the valve body 114. The rocker arm 113 is installed in the middle of the rotating shaft 122 and locked with two second locking nuts 124. The valve 102 is installed at the end of the rotating shaft 122 and locked with two first locking nuts 117.

[0038] Furthermore, a non-metallic wear-resistant bushing 118 is installed in the inner hole of the valve body 114, and the wear-resistant bushing 118 and the valve body 114 are positioned by a step stop. The outer flange cover 123 is fixed to the left end flange of the valve body 114 by a third screw 119. The outer flange cover 123 can prevent the bushing 118 from sliding out of the valve body 114. The second O-ring 120 is installed on the inner end face of the outer flange cover 123, which can effectively prevent leakage of materials.

[0039] Furthermore, the tail of the electric push rod 108 is fixed to the bracket by using the first pin shaft 109 and the first cotter pin 110 , and the telescopic rod at the head of the electric push rod 108 is connected to the swing rod 113 by using the second pin shaft 111 and the second cotter pin 112 .

[0040] Furthermore, by adjusting the swing angle of the swing rod 113, the scale plate 101 is installed at the corresponding position of the flange of the valve body 114. The scale plate is engraved with 0-100% numerical marks, which can intuitively display the opening size of the valve.

[0041] Furthermore, the first limit stopper 103 is fixed to the valve body 114 by using two first screws 104 , and the second limit stopper 105 is fixed to the valve body 114 by using two second screws 106 .

[0042] When working, the computer in the operating room gives the electric push rod 108 an action signal, and the electric push rod axis extends (retracts) forward (or backward), driving the swing rod 113 to rotate, and the rotating shaft 122 connected to the swing rod 113 rotates accordingly, thereby causing the opening of the valve 102 to change. When the valve 102 rotates counterclockwise, the opening of the valve 102 becomes larger, the discharge of the hot mill increases, and the production capacity is improved. On the contrary, the opening of the valve 102 becomes smaller, and the output is small. The first limit baffle 103 and the second limit baffle 105 on the valve body 114 can not only effectively protect the valve 102 and extend the service life of the valve, but also play a limiting role to ensure that the valve 102 rotates within a certain angle range, thereby protecting the electric push rod 108 from working within a certain stroke.

[0043] The present invention is a discharge valve device for the discharge port of a hot mill of a medium (high) density fiberboard production equipment, comprising a bracket, a rocker arm, a rotating shaft, a valve, a valve body, a first wear-resistant sleeve, a second wear-resistant sleeve, a wear-resistant bushing, an outer flange cover, two limit baffles, and an electric push rod. The bracket is welded to the flanges at both ends of the valve body, the rear end of the electric push rod is fixed to the bracket through a pin shaft, the front end is connected to the rocker arm by a pin shaft, the rocker arm is fixed to the rotating shaft by a nut, the rotating shaft passes through the valve body and is fixed to the valve body, a valve is installed at the end of the rotating shaft, and the valve and the rotating shaft are fixed to the valve body by a nut. The bushing is installed in the inner hole of the valve body, a blocking flange is provided outside the bushing to prevent the bushing from sliding out of the valve body, the blocking flange is fixed to the valve body by screws, and two crescent-shaped baffles are provided around the valve on the valve body. During operation, the electric discharge valve controls the rotation of the rocker arm by extending and retracting the electric push rod, and the valve rotates accordingly, thereby controlling the opening of the discharge valve. This type of discharge valve has reliable performance, simple structure, easy operation, and can achieve online real-time control.

[0044] Has the following effects:

[0045] 1. The manual discharge valve is inconvenient to operate and needs to be operated on site, while the electric discharge valve of the present invention can realize online automatic control;

[0046] 2. The worm gear and worm of the manual discharge valve are prone to wear and tear, and need to be replaced regularly, which is troublesome. However, the electric discharge valve of the present invention eliminates the worm gear and worm structure and adopts an electric push rod, which improves the operation stability;

[0047] 3. The electric discharge valve of the present invention has a guide angle, which effectively guides the direction of the material ejected from the valve body, while also reducing the wear of the valve itself and increasing the service life of the valve itself;

[0048] 4. Two crescent-shaped baffles are provided at the discharge port of the electric discharge valve of the present invention, which can protect the valve and reduce its wear, and also reduce the impact of the ejected material and steam on the subsequent spraying pipe;

[0049] 5. The electric discharge valve of the present invention is equipped with a scale plate on the valve body surface, which can not only perform online real-time control in the control room, but also visually see the opening of the discharge valve at the equipment operation site;

[0050] 6. Compared with the manual discharge valve, it has a simple structure, low maintenance cost, convenient maintenance and operation, low operating cost, and improves the equipment's operating rate;

[0051] 7. The electric discharge valve of the present invention can control the valve opening by electrical appliances, thereby realizing automatic feedback and automatic control of the discharge volume and the grinding chamber pressure.

Claims

1. An electric discharge valve for a thermal mill, comprising a discharge valve body, with mounting flanges provided at both ends of the valve body, characterized in that: A rotating shaft is installed in the space between the mounting flanges at both ends of the valve body. The two ends of the rotating shaft are respectively mounted in the mounting holes of the mounting flanges at both ends of the valve body. One end of the rotating shaft extends out of the mounting flange and is fixedly connected to the valve. A bracket is fixedly connected to the outside of the valve body. An electric push rod is hingedly installed on the bracket. A swing rod is hingedly connected to the lower end of the electric push rod. The lower end of the swing rod is fixedly connected to the middle of the rotating shaft. The cross section of the valve is in the shape of ",", and its cross section contour line includes an arc shape located on one side and a curve shape located on the other side, wherein the lower section of the curve shape contour is a section of inclined guide surface parallel to the axis, and the arc shape contour is an inclined surface intersecting with the end surface and the circumferential surface at the same time; the first limit baffle and the second limit baffle are fixedly installed on the outer end surface of the mounting flange of the valve body connected to the valve, the outer contour line of the first limit baffle is an arc shape, and the inner contour line is a curve shape adapted to the valve; the inner and outer sides of the second limit baffle are inferior arc shapes; The lower end of the swing rod is connected with the square shaft section of the rotating shaft through a square hole, a first locking nut is arranged at the outer end of the rotating shaft, and a second locking nut is arranged between the swing rod and the mounting flange on the other side of the valve body relative to the valve; The bracket is arranged upwardly at an angle from one side of the valve body, and the lower ends of the two sides of the bracket are fixedly connected to the flanges at both ends of the valve body by welding; the tail of the electric push rod is hingedly connected to the mounting seat at the top of the bracket through the first pin shaft and the first cotter pin; the front end of the electric push rod is hingedly connected to the upper end of the rocker arm through the second pin shaft and the second cotter pin.

2. The electric discharge valve for a thermal mill according to claim 1, characterized in that: A scale plate is arranged on the outer circumferential surface of the mounting flange of the valve body connected to the valve at a position corresponding to the swing amplitude of the swing rod, and a numerical mark of 0-100% is engraved on the scale plate.

3. The electric discharge valve for a thermal mill according to claim 2, characterized in that: The two ends of the rotating shaft are respectively mounted in the mounting holes of the mounting flange through the first wear-resistant sleeve and the second wear-resistant sleeve, and the first wear-resistant sleeve and the second wear-resistant sleeve are fixedly connected to the rotating shaft through screws.

4. The electric discharge valve for a thermal mill according to claim 3, characterized in that: A limit stop ring capable of limiting and blocking between the rocker arm and the end face of the mounting flange is arranged on the outer circumferential surface of the first wear-resistant sleeve, and a first O-type sealing ring is arranged between the outer circumferential surface of the first wear-resistant sleeve and the mounting hole of the valve body.

5. The electric discharge valve for a thermal mill according to claim 1, characterized in that: The valve body is fixedly connected to the outer side of the mounting flange at the other end of the valve with an outer flange cover, a wear-resistant bushing is arranged in the inner hole of the valve body, a limiting step hole is arranged in the inner hole of the valve body, a limiting boss is arranged on the outer circumferential surface of the wear-resistant bushing, the wear-resistant bushing is positioned and installed in the inner hole of the valve body through the limiting boss and the limiting step hole, and the outer flange cover cooperates with the outer end surface of the wear-resistant bushing to limit the position.

6. The electric discharge valve for a thermal mill according to claim 5, characterized in that: A second O-ring is arranged between the inner side of the outer flange cover and the outer end surface of the wear-resistant bushing.

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