A rotary valve and a control method

Abstract

A rotary valve (100) includes a turntable (110), a swing arm (131), a ratchet wheel (152), a pawl (151), a first protruding member (132), a second protruding member (133), a starting limit member (142) and an ending limit member (143). The starting limit member and the ending limit member are both components separated from the ratchet wheel and are respectively located on both sides of the swing arm. The swing of the swing arm drives the first protruding member to move towards the starting limit member so that the first protruding member abuts against the starting limit member, and the swing of the swing arm drives the second protruding member to move towards the ending limit member so that the second protruding member abuts against the ending limit member, thereby enabling the turntable to rotate by a predetermined angle. This rotary valve has high reliability, can be adjusted online in real time, realizes accurate feedback of the actual movement angle of the turntable, ensures that the turntable can rotate by a predetermined angle, and can timely calibrate the movement position and angle of the pawl. A control method for the rotary valve is also disclosed.

Description

[0001] Specification Technical Field

[0002] The present invention relates to the technical field of valves, and more particularly to a rotary valve and a control method. Background Art

[0003] Rotary valves are mainly used in the simulated moving bed process in the petrochemical field and are key equipment for realizing continuous adsorption separation processes and purifying desired products. Existing rotary valves usually rely on hydraulic systems to provide power, but hydraulic components are prone to problems such as hydraulic oil leakage, jamming between parts, jamming or signal interruption of electromagnetic four-way valve cores, and damage to hydraulic cylinder components. At the same time, the turntable of the rotary valve also has problems such as inability to operate continuously, difficulty in accurately controlling the angle, and the instantaneous error and error accumulation generated by the ratchet of the rotary valve during rotation cannot be eliminated, which limits the processing capacity of the simulated moving bed process system, resulting in reduced production efficiency and a significant increase in production costs.

[0004] Therefore, there is a need to provide a rotary valve and a control method to at least partially solve the above problems. Summary of the Invention

[0005] A series of simplified concepts are introduced in the Summary of the Invention section, which will be further elaborated in the Detailed Description section. The Summary of the Invention section of the present invention does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the protection scope of the claimed technical solution.

[0006] To at least partially solve the above problems, according to a first aspect of the present invention, there is provided a rotary valve, the rotary valve comprising:

[0007] A turntable, a fixed plate, and a sealing plate;

[0008] A driving device, the driving device including a servo motor;

[0009] A swing arm, the swing arm being connected to the driving device, the servo motor driving the swing arm to swing;

[0010] A ratchet, the ratchet being fixedly connected to the turntable;

[0011] A pawl, the pawl including a connecting end and a free end, the connecting end being connected to the swing arm, the free end being adapted to abut against the teeth of the ratchet, the swing arm swinging to drive the pawl to swing, so that the pawl pushes the ratchet to rotate to drive the turntable to rotate;

[0012] A first protruding member and a second protruding member, the first protruding member and the second protruding member being respectively disposed on two opposite sides of the swing arm; and

[0013] A starting limit member and an ending limit member, both the starting limit member and the ending limit member are components separated from the ratchet wheel, and are respectively located on both sides of the swing arm.

[0014] Wherein, the swing of the swing arm drives the first protruding member to move towards the starting limit member so that the first protruding member abuts against the starting limit member, and the swing of the swing arm drives the second protruding member to move towards the ending limit member so that the second protruding member abuts against the ending limit member, thereby causing the turntable to rotate a predetermined angle.

[0015] For the rotary valve according to the present invention, the starting limit member and the ending limit member play a role of mechanical limit on the swing of the swing arm and the rotation of the turntable, with high reliability, can be adjusted online in real time, realize accurate feedback of the actual movement angle of the turntable, ensure that the turntable can rotate a predetermined angle, and can timely calibrate the movement position and angle of the pawl.

[0016] Optionally, an angle sensor is provided on the ratchet wheel. Thereby detecting the rotation angle.

[0017] Optionally, a control device is further included, the control device is electrically connected to both the angle sensor and the driving device, and the control device is configured to control the swing amplitude of the swing arm according to the angle fed back by the angle sensor. The control device can control the swing amplitude of the swing arm according to the actual movement angle fed back by the angle sensor, thereby calibrating the movement position and angle of the pawl in real time, and can adjust the rotation angle and actual position of the ratchet wheel and the turntable to achieve zero error in stages.

[0018] Optionally, a control device is further included, the control device is electrically connected to the driving device, and the control device is configured to control the movement of the servo motor according to the abutment of the first protruding member against the starting limit member and / or according to the abutment of the second protruding member against the ending limit member. Thereby ensuring that the turntable can rotate a predetermined angle.

[0019] Optionally, an angle indicating disk is provided below the ratchet wheel, the ratchet wheel and the angle indicating disk are coaxially arranged and are both connected to the turntable through a central shaft. Thereby ensuring the accuracy of the detected angle.

[0020] Optionally, a limit frame is further included, the limit frame is provided with a guide groove, the guide groove is provided with the starting limit member and the ending limit member and both the starting limit member and the ending limit member are movable relative to the guide groove. Thereby, the positions where the starting limit member and the ending limit member are located can be adjusted flexibly.

[0021] Optionally, the fixed disk is arranged below the turntable, and the turntable is rotatable relative to the fixed disk. Thereby, materials can be distributed.

[0022] Optionally, the fixed disk is provided with a first pipeline and a second pipeline, and the rotating disk is provided with an intermediate pipeline. The intermediate pipeline rotates with the rotation of the rotating disk and is used to connect the first pipeline and the second pipeline. This facilitates the distribution of materials.

[0023] Optionally, it includes a plurality of first pipelines. The swing arm drives the rotating disk to rotate by different angles so that the intermediate pipeline communicates with different first pipelines. This facilitates the distribution or isolation of materials.

[0024] Optionally, the sealing plate is arranged between the rotating disk and the fixed disk and is connected to the rotating disk. This ensures the sealed contact between the rotating disk and the fixed disk.

[0025] The present invention also provides a control method for the above-mentioned rotary valve, including:

[0026] The control device controls the piston rod of the driving device to move, so as to drive the ratchet pawl and the ratchet wheel to move forward and the second protruding member to move towards the end limiting member;

[0027] The angle sensor detects the actual movement angle of the ratchet wheel and feeds back the actual movement angle to the control device;

[0028] Judge whether the actual movement angle reaches the set value;

[0029] If the actual movement angle reaches the set value, the control device controls the ratchet pawl to move in the reverse direction;

[0030] If the actual movement angle does not reach the set value, the ratchet pawl and the ratchet wheel continue to move forward.

[0031] According to the control method of the present invention, for the above-mentioned rotary valve, the electric control system and the mechanical limit system work simultaneously, with high reliability, can be adjusted online in real time, and can accurately feedback the actual movement angle of the ratchet wheel, so as to ensure that the rotating disk can rotate a predetermined angle and can timely calibrate the movement position and angle of the ratchet pawl.

[0032] Optionally, if the actual movement angle reaches the set value, the control device controls the ratchet pawl to move in the reverse direction and judges whether the deviation of the actual movement angle is greater than the error value. Thus, the rotation accuracy of the ratchet wheel is further improved.

[0033] Optionally, if the deviation of the actual movement angle is less than the error value, the control device controls the ratchet pawl to move forward;

[0034] If the deviation of the actual movement angle is greater than the error value, the control device issues a correction instruction to adjust the telescopic amount of the piston rod of the driving device.

[0035] In this way, multi-level adjustment of the actual rotation angle of the ratchet wheel is realized, and the rotation accuracy of the ratchet wheel is ensured.

[0036] Optionally, if the actual movement angle does not reach the set value, the control device controls the ratchet and pawl to continue moving forward, and the second protruding member continues to move towards the termination limiting member. In this way, the second protruding member and the termination limiting member can prevent the ratchet from rotating too large an angle, enhancing safety and being more reliable.

[0037] Optionally, if the second protruding member does not abut against the termination limiting member, the control device controls the pawl to move forward;

[0038] If the second protruding member abuts against the termination limiting member, the ratchet and pawl stop moving and the control device controls the output shaft of the driving device to return. Description of the Drawings

[0039] The following drawings of the present invention are used as a part of the present invention to understand the present invention. The embodiments of the present invention are shown in the drawings and their descriptions are used to explain the device and principle of the present invention. In the drawings,

[0040] Figure 1 is a longitudinal sectional view of a preferred rotary valve according to the present invention;

[0041] Figure 2 is Figure 1 a schematic diagram of the material pipeline of the rotary valve shown;

[0042] Figure 3 is Figure 1 a partial top view of the rotary valve shown; and

[0043] Figure 4 is a control logic diagram for the control method of the rotary valve according to the present invention.

[0044] Description of the Reference Numerals:

[0045] 100: Rotary valve 101: Valve cover

[0046] 110: Turntable 111: Fixed disk

[0047] 112: Sealing plate 113: First pipeline

[0048] 114: Second pipeline 116: Intermediate pipeline

[0049] 117: Central axis 120: Driving device

[0050] 121: Servo motor 122: Servo electric cylinder

[0051] 123: Piston rod of the servo electric cylinder 131: Swing arm

[0052] 132: First protruding member 133: Second protruding member

[0053] 141: Limit frame 142: Starting limit member

[0054] 143: Terminating limit member 144: Guide groove

[0055] 151: Pawl 152: Ratchet wheel

[0056] 160: Control device 161: Angle sensor

[0057] 162: Angle indicating disc Detailed implementation manners

[0058] In the following description, numerous specific details are given to provide a more thorough understanding of the present invention. However, it is obvious to those skilled in the art that the present invention can be implemented without one or more of these details. In other instances, in order to avoid obscuring the present invention, some well-known technical features are not described.

[0059] To thoroughly understand the present invention, detailed structures will be presented in the following description to illustrate the present invention. Obviously, the implementation of the present invention is not limited to the specific details familiar to those skilled in the art of this technology. The preferred implementation manners of the present invention are described in detail below. However, in addition to these detailed descriptions, the present invention can also have other implementation manners and should not be construed as being limited to the implementation manners presented here.

[0060] It should be understood that the purpose of the terms used herein is only to describe specific implementation manners and is not a limitation of the present invention. The singular forms of "a", "an" and "the" are also intended to include the plural forms unless the context clearly indicates otherwise. When the terms "comprise" and / or "include" are used in this specification, they specify the presence of the described features, wholes, steps, operations, elements and / or components, but do not preclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or their combinations. The terms "upper", "lower", "front", "rear", "left", "right" and similar expressions used in the present invention are for illustrative purposes only and are not limitations.

[0061] The ordinal numbers such as "first" and "second" cited in the present invention are only identifiers and do not have any other meanings, such as a specific order, etc. Moreover, for example, the term "first component" does not imply the existence of a "second component" by itself, and the term "second component" does not imply the existence of a "first component" by itself.

[0062] Hereinafter, the specific implementation manners of the present invention will be described in more detail with reference to the accompanying drawings. These drawings show representative implementation manners of the present invention and do not limit the present invention.

[0063] As Figure 1 shown, the present invention provides a rotary valve 100 for distributing materials. The rotary valve 100 includes a turntable 110 and a driving device 120. The turntable 110 can be connected to the driving device 120, and the driving device 120 can drive the turntable 110 to rotate. The bottom of the driving device 120 can be fixed on a support table (not shown) located on the side of the turntable 110. The driving device 120 is arranged above the turntable 110 along the height direction of the rotary valve 100. The turntable 110 can be a substantially disc structure. The height direction of the rotary valve 100 can be parallel to the axial direction of the turntable 110, and the radial direction of the rotary valve 100 can be parallel to the radial direction of the turntable 110.

[0064] Combined with Figure 3 shown, the driving device 120 can include a servo motor 121, and the servo motor 121 can drive the turntable 110 to rotate. Specifically, the driving device 120 further includes a servo electric cylinder 122. The servo motor 121 can be connected to the servo electric cylinder 122 to drive the servo electric cylinder 122 to operate. The servo motor 121 and the servo electric cylinder 122 can be arranged in parallel. The output end of the servo motor 121 can be connected to the servo electric cylinder 122, and the servo motor 121 can transmit the motor torque to the servo electric cylinder 122. Thus, the rotational motion output by the servo motor 121 can be converted into the linear motion of the piston rod 123 of the servo electric cylinder 122. For example, the piston rod 123 of the servo electric cylinder 122 can move horizontally in a telescopic manner. The connection manner between the servo motor 121 and the servo electric cylinder 122 is an existing connection manner, which will not be elaborated here.

[0065] Preferably, the rotary valve 100 can further include a control device 160, and the control device 160 can be electrically connected to the driving device 120. Preferably, the control device 160 can be configured as a host computer, and the host computer can be electrically connected to the servo motor 121 to control the operation of the servo motor 121, thereby controlling the linear motion of the piston rod 123 of the servo electric cylinder 122. In particular, the host computer can control the moving displacement of the piston rod 123 of the servo electric cylinder 122 by controlling the servo motor 121.

[0066] In this way, the servo motor 121 and the servo electric cylinder 122 provide power, with high reliability, avoiding faults caused by oil leakage, blockage, etc. in the existing hydraulic system, and avoiding downtime caused by work such as regularly replacing the filtration system and maintaining the solenoid valve. Further, the servo control system (the servo motor 121, the servo electric cylinder 122, the control device 160, and the corresponding angle, displacement, and torque sensing devices) adopts closed-loop servo control, with high control precision, accurate angle, displacement, and torque measurement accuracy, and fast response time.

[0067] Further, the rotary valve 100 further includes a swing arm 131. The swing arm 131 is disposed above the turntable 110 along the height direction of the rotary valve 100. The thickness direction of the swing arm 131 is parallel to the axial direction of the turntable 110, and the length direction of the swing arm 131 is parallel to the radial direction of the turntable 110. The swing arm 131 is connected to the driving device 120, and the driving device 120 drives the swing arm 131 to swing. One end of the swing arm 131 can be hinged to the piston rod 123 of the servo electric cylinder 122. When the height direction of the rotary valve 100 is parallel to the vertical direction, the axial direction of the turntable 110 is parallel to the vertical direction, and when the piston rod 123 of the servo electric cylinder 122 can move telescopically in the horizontal direction, the swing arm 131 can swing in the horizontal direction.

[0068] The rotary valve 100 further includes a pawl 151 and a ratchet 152. The pawl 151 and the ratchet 152 are both disposed above the turntable 110 along the height direction of the rotary valve 100. The axial direction of the ratchet 152 is parallel to the axial direction of the turntable 110, and the radial direction of the ratchet 152 is parallel to the radial direction of the turntable 110. The pawl 151 can push the ratchet 152 to rotate about the axial direction of the ratchet 152.

[0069] Specifically, the pawl 151 includes a connecting end and a free end. The connecting end of the pawl 151 is connected to the swing arm 131. Preferably, the connecting end of the pawl 151 is connected to the lower surface of the swing arm 131 along the height direction of the rotary valve 100. The swinging direction of the pawl 151 is the same as the swinging direction of the swing arm 131 and is parallel to the telescopic movement direction of the piston rod 123 of the servo electric cylinder 122. For example, when the piston rod 123 of the servo electric cylinder 122 moves telescopically in the horizontal direction and the swing arm 131 swings back and forth in the horizontal direction, the pawl 151 can also swing back and forth in the horizontal direction along with the swing arm 131.

[0070] The free end of the pawl 151 is used to abut against the teeth of the ratchet 152. In this way, the swinging of the swing arm 131 can drive the pawl 151 to swing, so that the pawl 151 can push the ratchet 152 to rotate about the central axis of the ratchet 152 along the first direction D1. The ratchet 152 can be fixedly connected to the turntable 110. The central axis of the ratchet 152 can coincide with the central axis of the turntable 110. That is, the ratchet 152 and the turntable 110 can be coaxially arranged. Figure 3 The direction of the first direction D1 is schematically drawn, which does not refer to a specific orientation, but is schematically drawn only for the convenience of describing the present specific embodiment.

[0071] The rotary valve 100 further includes a stator plate, a sealing plate, and a central shaft 117. The sealing plate is connected to the rotating disk, and both the sealing plate and the rotating disk are rotatable relative to the stator plate, which will be described in detail later. The ratchet 152 is connected to the rotating disk 110 through the central shaft 117. The central shaft 117 can be fixedly connected to both the ratchet 152 and the rotating disk 110. In this embodiment, "fixed connection" means that the ratchet 152 and the rotating disk 110 are relatively fixed, that is, the ratchet 152 and the rotating disk 110 are stationary relative to each other, but the ratchet 152 and the rotating disk 110 can be disassembled. In this way, the swing of the swing arm 131 can drive the swing of the pawl 151, so that the pawl 151 pushes the ratchet 152 to rotate to drive the rotating disk 110 to rotate.

[0072] The specific movement process is as follows:

[0073] As Figure 3 shown, when the piston rod 123 of the servo electric cylinder 122 extends, the swing arm 131 swings, and the pawl 151 also swings together with the swing arm 131. The pawl 151 abuts against the teeth of the ratchet 152, so that the pawl 151 pushes the ratchet 152 to rotate around the central axis of the ratchet 152, and then drives the rotating disk 110 to rotate around the central axis of the rotating disk 110.

[0074] When the piston rod 123 of the servo electric cylinder 122 retracts, the swing arm 131 swings, and the pawl 151 also swings together with the swing arm 131. The pawl 151 moves to the position of the next tooth along the second direction D2, and the pawl 151 does not exert a driving force on the ratchet 152. At this time, the pawl 151 moves, and neither the ratchet 152 nor the rotating disk 110 rotates. Figure 3 The direction of the second direction D2 is schematically drawn in the figure, which does not refer to a specific orientation, but is schematically drawn only for the convenience of describing this specific embodiment.

[0075] In this way, under the telescopic action of the piston rod 123 of the servo electric cylinder 122 and the swinging action of the swing arm 131, the pawl 151 pushes the ratchet 152 to perform an intermittent step rotation movement along the first direction D1.

[0076] Further, the swing arm 131 includes two sides opposite to each other along the swing direction of the swing arm 131. The swing direction of the swing arm 131 is parallel to the telescopic movement direction of the servo electric cylinder 122. The swing valve 100 further includes a first protruding member 132 and a second protruding member 133, and the first protruding member 132 and the second protruding member 133 are respectively arranged on the two opposite sides of the swing arm 131. Both the first protruding member 132 and the second protruding member 133 are fixedly connected to the swing arm 131. For example, the first protruding member 132 and the second protruding member 133 can be connected to the swing arm 131 by welding, and the first protruding member 132 and the second protruding member 133 can swing with the swing arm 131. Preferably, both the first protruding member 132 and the second protruding member 133 are configured as triangular plates, thereby ensuring stability. The corners of the first protruding member 132 and the second protruding member 133 can be configured as rounded corners to avoid damage.

[0077] The swing valve 100 further includes a starting limit member 142 and an ending limit member 143. Both the starting limit member 142 and the ending limit member 143 are components separated from the ratchet wheel 152 and are respectively located on both sides of the swing arm 131. Preferably, the swing valve 100 further includes a limit frame 141, and the limit frame 141 is arranged above the ratchet wheel 152. Both the starting limit member 142 and the ending limit member 143 are arranged on the limit frame 141. The swing arm 131 is located between the starting limit member 142 and the ending limit member 143 and is spaced apart from the starting limit member 142 and the ending limit member 143. The starting limit member 142 is located on the side where the first protruding member 132 is arranged, and the ending limit member 143 is located on the side where the second protruding member 133 is arranged.

[0078] The limit frame 141 is provided with a guide groove 144. The guide groove 144 is provided with the starting limit member 142 and the ending limit member 143, and both the starting limit member 142 and the ending limit member 143 are movable relative to the guide groove 144. Preferably, the extending direction of the guide groove 144 is parallel to the telescopic movement direction of the piston rod 123 of the servo electric cylinder 122. Both the starting limit member 142 and the ending limit member 143 can slide in the guide groove 144 and can be respectively adjusted to a predetermined position and then fixed. Thus, the swing amplitude of the swing arm 131 can be adjusted. In this embodiment, the "predetermined position" refers to the respectively set positions of the starting limit member 142 and the ending limit member 143.

[0079] Further, as Figure 1As shown, an angle indicator disk 162 is provided below the ratchet 152, and the angle indicator disk 162 is coaxially arranged with the ratchet 152 and both are connected to the turntable 110 through the central shaft 117. The angle indicator disk 162 is arranged above the turntable 110 so as to indicate angle information in real time, and has high reliability. Specifically, the angle indicator disk 162 includes a disk surface and a pointer, and the disk surface is connected to the central shaft 117 and the ratchet 152. The rotation of the ratchet 152 drives the disk surface to rotate relative to the pointer, so that the pointer indicates the rotation angle of the ratchet 152. The top of the central shaft 117 along the height direction of the rotary valve 100 passes through the center of the ratchet 152 and the angle indicator disk 162 and is connected to the ratchet 152 and the angle indicator disk 162, and the bottom of the central shaft 117 along the height direction of the rotary valve 100 is connected to the turntable 110. The turntable 110 can rotate synchronously with the ratchet 152. The central shaft 117 can be formed by a multi-section shaft connected by a coupling.

[0080] The control device 160 may be configured to control the movement of the servo motor 121 according to the abutment between the first protruding member 132 and the initial stopper 142. Figure 3 , the servo motor 121 drives the piston rod 123 of the servo electric cylinder 122 to retract, and the swing arm 131 swings. At the same time, the swing arm 131 drives the first protruding piece 132 to move toward the starting limit piece 142. The ratchet 151 moves along the second direction D2, and at this time, the ratchet 152 does not rotate. The swing arm 131 swings to drive the first protruding piece 132 to abut against the starting limit piece 142, and the piston rod 123 of the servo electric cylinder 122 stops retracting, and the swing arm 131 stops swinging. The control device senses that the movement stops and can perform corresponding control operations. The control operation will be described later.

[0081] If the first protruding piece 132 does not touch the initial stopper 142, the control device controls the servo motor 121 to operate, thereby controlling the piston rod 123 of the servo electric cylinder 122 to continue to retract, increasing the swing amplitude of the swing arm 131, and finally making the first protruding piece 132 abut against the initial stopper 142. In this way, it can be ensured that the swing arm 131 swings to the position abutting against the initial stopper 142, with high reliability and real-time online adjustment.

[0082] The control device 160 can be configured to control the movement of the servo motor 121 according to the second protruding member 133 abutting against the end limiting member 143. Specifically, the servo motor 121 drives the piston rod 123 of the servo electric cylinder 122 to extend, the swing arm 131 drives the pawl 151 to move, and at the same time, the swing arm 131 drives the second protruding member 133 to move towards the end limiting member 143. The pawl 151 moves along the first direction D1. At this time, the pawl 151 pushes the ratchet wheel 152 to rotate around the central axis of the ratchet wheel 152, thereby driving the turntable 110 to rotate around the central axis of the turntable 110. The swing of the swing arm 131 drives the second protruding member 133 to abut against the end limiting member 143, the piston rod 123 of the servo electric cylinder 122 stops extending, the swing arm 131 stops swinging, the pawl 151 stops swinging, and the ratchet wheel 152 and the turntable 110 stop rotating. In this way, the turntable 110 can be rotated by a predetermined angle. The control device can perform corresponding control operations when it senses the stop of the movement.

[0083] When the preset displacement of the servo electric cylinder 122 does not cause the second protruding member 133 to touch the end limiting member 143, the control device controls the servo motor 121 to operate, so as to control the piston rod 123 of the servo electric cylinder 122 to continue to extend, that is, to increase the displacement of the piston rod 123 of the servo electric cylinder 122, and finally make the second protruding member 133 abut against the end limiting member 143. Thereby, it can be ensured that the turntable 110 can rotate a predetermined angle, with high reliability and the ability to be adjusted in real time online.

[0084] Therefore, the rotary valve 100 provided by the present invention can introduce process materials into different beds in sequence through different channels according to the designed cycle sequence and make the process materials be led out from the beds, so as to continuously and periodically obtain high-purity products. In this way, the rotary valve 100 can continuously rotate according to the above process to ensure that the material distribution process is continuous and coherent, and by controlling the swing amplitude of the swing arm 131, the actual movement angle of the turntable 110 can be controlled.

[0085] The turntable 110 of the rotary valve 100 of the present invention is driven by a servo motor 121, with a compact structure, small floor space, environmental protection and safety, low energy consumption, low system noise, no pollution sources such as hydraulic oil, eliminating the location of a large hydraulic station, light weight, easy to install, without the need to additionally set up a cooling system and a power station, and not polluting the environment.

[0086] The rotary valve 100 according to the present invention includes a swing arm 131, a ratchet wheel 152, a ratchet pawl 151, a first protruding member, a second protruding member, a starting limiting member 142 and an ending limiting member 143. The swinging of the swing arm 131 drives the first protruding member 132 to move towards the starting limiting member 142 so that the first protruding member 132 abuts against the starting limiting member 142. The swinging of the swing arm 131 drives the second protruding member 133 to move towards the ending limiting member 143 so that the second protruding member 133 abuts against the ending limiting member 143, thereby causing the turntable 110 (ratchet wheel 152) to rotate by a predetermined angle. The starting limiting member 142 and the ending limiting member 143 play a role in mechanically limiting the swinging of the swing arm 131 and the rotation of the turntable 110, with high reliability. They can play a positioning role when the electronic control system fails, and can be adjusted online in real time to accurately feedback the actual movement angle of the turntable 110, ensure that the turntable 110 and the ratchet wheel 152 can rotate by a predetermined angle, and can timely calibrate the movement position and angle of the ratchet pawl 151.

[0087] An angle sensor 161 may also be provided on the ratchet wheel 152 to detect the rotation angle of the ratchet wheel. Since the ratchet wheel 152 is fixedly connected to the turntable 110 coaxially, the actual movement angle of the ratchet wheel 152 is equal to the actual movement angle of the turntable 110. The angle sensor 161 can move synchronously with the ratchet wheel 152 and can feedback the angle signal to the control device 160. The control device 160 can make corresponding control operations according to the angle feedback by the angle sensor 161. For example, the control device 160 can be configured to control the swinging amplitude of the swing arm 131 according to the angle feedback by the angle sensor 161, so as to achieve dynamic response and positioning, identify the cumulative error and calibrate through feedback.

[0088] When the angle feedback by the angle sensor 161 is less than the predetermined angle, the control device can control the servo motor 121 to act to increase the displacement of the piston rod 123 of the servo electric cylinder 122, thereby increasing the swinging amplitude of the swing arm 131, and further increasing the actual movement angles of the ratchet wheel 152 and the turntable 110.

[0089] In this way, the rotary valve 100 controls the swinging amplitude of the swing arm 131 and the actual movement angles of the ratchet wheel 152 and the turntable 110 through mechanical limiting and the electronic control system at the same time. The control device can control the swinging amplitude of the swing arm 131 according to the movement angle feedback by the angle sensor 161, so as to timely calibrate the movement position and angle of the ratchet pawl 151, and can adjust the rotation angle and the actual position of the ratchet wheel 152 and the turntable 110 to achieve zero error in stages. At the same time, combined with the starting limiting member 142 and the ending limiting member 143 for mechanical positioning, the accuracy of positioning is further ensured.

[0090] The following combines Figure 4 to describe the control logic operations of the mechanical limiting and the electronic control system.

[0091] The control device 160 issues an instruction to the drive device 120 to cause the drive device 120 to operate. The control device 160 issues an instruction to the drive device 120, and the output shaft of the drive device 120 moves. Specifically, the control device 160 issues an instruction to the servo motor 121 to control the servo motor 121 to rotate forward, so as to drive the piston rod 123 of the servo electric cylinder 122 to extend. The control device 160 can set the extension amount of the piston rod 123 of the servo electric cylinder 122. Of course, the control device 160 can also output a signal to the drive device 120 to control the servo motor 121 to rotate in reverse, and the piston rod 123 of the servo electric cylinder 122 returns.

[0092] The piston rod 123 of the servo electric cylinder 122 is connected to the swing arm 131. When the piston rod 123 of the servo electric cylinder 122 extends, the swing arm 131 moves forward at this time. For the convenience of description, in this embodiment, when the output shaft of the servo motor 121 rotates forward, it can drive the swing arm 131 to move forward. When the output shaft of the servo motor 121 rotates in reverse, it can drive the swing arm 131 to move in reverse. Of course, the respective structures of the servo motor 121 and the servo electric cylinder 122 can be adjusted so that when the output shaft of the servo motor 121 rotates forward, the swing arm 131 moves in reverse; when the output shaft of the servo motor 121 rotates in reverse, the swing arm 131 moves forward. This embodiment does not limit this.

[0093] The swing arm 131 is connected to the pawl 151. The swing of the swing arm 131 can drive the swing of the pawl 151. The swing direction of the pawl 151 is parallel to the swing direction of the swing arm 131. The pawl 151 can abut against the teeth of the ratchet wheel 152 to push the ratchet wheel 152 to rotate. The rotation of the ratchet wheel 152 drives the turntable 110 to rotate. In this embodiment, when the pawl 151 moves forward, the ratchet wheel 152 moves forward. As Figure 3 shown, the ratchet wheel 152 can rotate in the first direction D1 (counterclockwise). Of course, the swing directions of the servo electric cylinder 122, the swing arm 131, the pawl 151 and the orientation of the teeth of the ratchet wheel 152 can be adjusted so that the ratchet wheel 152 rotates clockwise. This embodiment does not limit this.

[0094] A second protruding member 133 is further provided on the swing arm 131. When the swing arm 131 swings forward, it can drive the second protruding member 133 to move in the direction of the end limiting member 143.

[0095] An angle sensor 161 is also provided on the ratchet wheel 152. The angle sensor 161 can detect the actual movement angle of the ratchet wheel 152 and feedback the actual movement angle to the control device 160. In this embodiment, the actual movement angle detected and feedback by the angle sensor 161 is the angle by which the ratchet wheel 152 rotates driven by the extension amount of the piston rod 123 of the servo electric cylinder 122 preset by the control device 160.

[0096] 1) If the actual movement angle reaches the set value, the control device 160 can control the piston rod 123 of the servo electric cylinder 122 to return, so that the pawl 151 moves in the reverse direction. In this embodiment, the "set value" is the theoretical value of the preset angle of rotation of the ratchet wheel 152. The set value can be equal to or less than the above-mentioned predetermined angle. In this way, the angle is controlled more precisely. Based on the mechanical swing of the swing arm 131, there is a deviation between the actual movement angle and the set value.

[0097] When the control device 160 controls the pawl 151 to move in the reverse direction, the control device 160 will also judge whether the deviation of the actual movement angle of the ratchet wheel 152 rotation is greater than the error value. The actual movement angle deviation is the difference between the actual movement angle and the set value. Thereby, the rotation accuracy of the ratchet wheel 152 is further improved. The specific judgment process is as follows:

[0098] i) If the actual movement angle deviation is greater than the error value, the control device 160 issues a correction instruction to adjust the expansion and contraction amount of the output shaft of the driving device 120, so as to adjust the next movement of the ratchet wheel 152 and the pawl 151. For example, when the set value is 60°, the error value is 3°, and the actual movement angle is 64°, the actual movement angle deviation is 4°, and the actual movement angle deviation is greater than the error value. The control device 160 controls the expansion and contraction amount of the piston rod 123 of the servo electric cylinder 122 during the next movement to adjust the swing amplitude of the next movement of the pawl 151, so as to adjust the actual movement angle of the next rotation of the ratchet wheel 152.

[0099] For example, the control device 160 can send a signal to the servo motor 121 to reduce the extension amount of the piston rod 123 of the servo electric cylinder 122, so as to reduce the swing amplitude of the next movement of the pawl 151, make the actual movement angle of the next rotation of the ratchet wheel 152 smaller, and then compensate for the angle exceeded by the ratchet wheel 152 during the previous movement. In this way, multi-level adjustment of the actual rotation angle of the ratchet wheel 152 is realized, and the rotation accuracy of the ratchet wheel 152 is guaranteed.

[0100] Of course, in an embodiment not shown, the swinging directions of the swing arm and the pawl, as well as the orientation of the teeth of the ratchet wheel, can also be adjusted so that when the piston rod of the servo electric cylinder retracts, the pawl can push the ratchet wheel to rotate. In this way, when the actual movement angle deviation of the ratchet wheel is greater than the error value, the control device sends a signal to the servo motor to reduce the retraction amount of the piston rod of the servo electric cylinder, thereby reducing the swinging amplitude of the next movement of the pawl, reducing the actual movement angle of the next rotation of the ratchet wheel, and further compensating for the angle exceeded by the ratchet wheel during the previous movement.

[0101] ii) If the actual movement angle deviation is less than the error value, the control device 160 controls the pawl 151 to move forward. For example, when the set value is 60°, the error value is 3°, and the actual movement angle is 61°, the actual movement angle deviation is 1°, and the actual movement angle deviation is less than the error value. The control device 160 controls the piston rod 123 of the servo electric cylinder 122 to extend to drive the ratchet wheel 152 and the pawl 151 to move forward. Thus, the cycle action is performed.

[0102] 2) If the actual movement angle does not reach the set value, the control device 160 controls the piston rod 123 of the servo electric cylinder 122 to continue to extend, so that the ratchet wheel 152 and the pawl 151 continue to move forward. The second protrusion 133 continues to move in the direction of the end limit member 143.

[0103] In the state where the actual movement angle does not reach the set value, if the second protrusion 133 does not abut against the end limit member 143, the control device 160 controls the piston rod 123 of the servo electric cylinder 122 to extend to drive the ratchet wheel 152 and the pawl 151 to move forward.

[0104] In the state where the actual movement angle does not reach the set value, if the second protrusion 133 abuts against the end limit member 143, it can be determined that at this time, electronic control devices such as the angle sensor 161 fail, resulting in the failure of electronic control limiting. The control device 160 controls the piston rod 123 of the servo electric cylinder 122 to return, the ratchet wheel 152 and the pawl 151 stop moving, and an alarm signal is issued to prompt the operator. In this way, the second protrusion 133 and the end limit member 143 can prevent the ratchet wheel 152 from rotating too large an angle, enhancing safety and being more reliable.

[0105] When the control device 160 controls the servo motor 121 to reverse, the servo motor 121 drives the piston rod 123 of the servo electric cylinder 122 to retract, the swing arm 131 and the pawl 151 move in the reverse direction, and the first protrusion 132 moves in the direction of the start limit member 142. The swing of the swing arm 131 drives the first protrusion 132 to abut against the start limit member 142, the piston rod 123 of the servo electric cylinder 122 stops retracting, and the swing arm 131 stops swinging.

[0106] When the first protruding member 132 does not touch the starting limiting member 142, the control device controls the servo motor 121 to continue running, thereby controlling the piston rod 123 of the servo electric cylinder 122 to continue retracting, increasing the swing amplitude of the swing arm 131, and finally making the first protruding member 132 abut against the starting limiting member 142. Thus, it can be ensured that the swing arm 131 swings to the position where it abuts against the starting limiting member 142, with high reliability and real-time online adjustment ability.

[0107] In this way, when the electric control limit fails, the mechanical limit (the second protruding member 133 and the terminating limiting member 143, as well as the first protruding member 132 and the starting limiting member 142) can play another level of prevention and control to avoid excessive rotation of the ratchet wheel 152, thereby avoiding excessive rotation of the turntable.

[0108] According to the control method of the present invention, for the above-mentioned rotary valve, the electric control system and the mechanical limit system work simultaneously, with high reliability, real-time online adjustment ability, and can accurately feedback the actual movement angle of the ratchet wheel, thereby ensuring that the turntable can rotate a predetermined angle and can timely calibrate the movement position and angle of the pawl.

[0109] As Figure 1 shown, the fixed disk 111 is arranged below the turntable 110. The fixed disk 111 can be configured in a substantially disc shape. A valve cover 101 can also be arranged above the turntable 110. The valve cover 101 can be buckled on the fixed disk 111 to form a closed cavity. The turntable 110 is rotatable relative to the fixed disk 111, so as to effectively distribute materials.

[0110] Specifically, the fixed disk 111 is provided with a first pipeline 113 and a second pipeline 114. Both the first pipeline 113 and the second pipeline 114 are fixedly connected to the lower surface of the fixed disk 111. Both the first pipeline 113 and the second pipeline 114 can convey materials. An intermediate pipeline 116 is arranged on the turntable 110. The intermediate pipeline 116 can rotate with the rotation of the turntable 110, and the intermediate pipeline 116 can communicate the first pipeline 113 and the second pipeline 114. Thus, the materials in the first pipeline 113 can enter the second pipeline 114 through the intermediate pipeline 116, or the materials in the second pipeline 114 can enter the first pipeline 113 through the intermediate pipeline 116, which is convenient for material distribution. The valve cover 101 can be provided with a central shaft 117, the turntable 110, the intermediate pipeline 116, etc., so as to ensure the sealing performance.

[0111] Furthermore, as Figure 1 and Figure 2 shown, the rotary valve 100 includes a plurality of first pipelines 113 and a plurality of second pipelines 114, thereby forming a multi-channel material rotary valve. In order to make the drawing simple, Figure 1Only one second pipeline 114 is shown. A plurality of first pipelines 113 may be arranged at intervals in the circumferential direction of the turntable 110, and the intermediate pipeline 116 may communicate with different first pipelines 113. The second pipelines 114 may also be arranged at intervals in the circumferential direction of the turntable 110, and the intermediate pipeline 116 may communicate with different second pipelines 114. The swing arm 131 swings to drive the pawl 151 to move. When the pawl 151 moves along the first direction D1, it can push the ratchet 152 to rotate, thereby driving the turntable 110 to rotate. The swing arm 131 can drive the turntable 110 to rotate by different angles, so that the intermediate pipeline 116 rotates by different angles. According to the actual situation, the intermediate pipeline 116 may connect the preset first pipeline 113 and the second pipeline 114.

[0112] The rotary valve 100 may further include a plurality of intermediate pipelines 116. The plurality of intermediate pipelines 116 may rotate by different angles with the turntable 110, so that different intermediate pipelines 116 are respectively connected to different first pipelines 113 and second pipelines 114.

[0113] The inlet ends and outlet ends of different intermediate pipelines 116 may be respectively connected to different first pipelines 113 and second pipelines 114, and the connected pipelines may be switched by rotating the turntable 110. When the central shaft 117 (turntable 110) rotates to different positions, the materials from different first pipelines 113 may be respectively communicated with different second pipelines 114 through different intermediate pipelines 116, or the materials from different second pipelines 114 may be respectively communicated with different first pipelines 113 through different intermediate pipelines 116.

[0114] The sealing plate 112 is arranged between the turntable 110 and the fixed plate 111 and is connected to the turntable 110. The sealing plate 112 may be fixedly connected to the lower surface of the turntable 110 to rotate with the turntable 110, so as to achieve the sealing contact between the turntable 110 and the fixed plate 111. As the sealing plate 112 rotates with the turntable 110, the non-connected first pipeline 113 and the second pipeline 114 may be separated by the sealing plate 112.

[0115] The chemical process materials can be input into the intermediate pipeline 116 through the second pipeline 114, and then enter the first pipeline 113 through the intermediate pipeline 116, so as to be transported to the designated device. The flow direction of the materials in the rotary valve 100 is two-way. The materials can also be input into the intermediate pipeline 116 through the first pipeline 113, then enter the second pipeline 114 through the intermediate pipeline 116, and finally be discharged through the second pipeline 114.

[0116] For example, the multiple first pipelines include a first sub-pipeline and a second sub-pipeline, the multiple intermediate pipelines include a third sub-pipeline and a fourth sub-pipeline, and the multiple second pipelines include a fifth sub-pipeline and a sixth sub-pipeline. The first sub-pipeline can communicate with the fifth sub-pipeline through the third sub-pipeline, and the second sub-pipeline can communicate with the sixth sub-pipeline through the fourth sub-pipeline. When the first sub-pipeline communicates with the fifth sub-pipeline through the third sub-pipeline, the second sub-pipeline and the sixth sub-pipeline can be separated by a sealing plate and not communicate with each other.

[0117] Thus, the rotary valve 100 provided by the present invention can achieve the input and output functions of chemical materials according to a certain distribution method. The electronic control system can provide power and drive the central shaft 117 to rotate through the ratchet 152 and pawl 151 mechanism. The central shaft 117 drives the turntable 110 to stepwise rotate, thereby realizing the communication and switching between each material pipeline. The actual movement angle of the ratchet 152 can be adjusted and calibrated, effectively eliminating the instantaneous error and error accumulation generated when the ratchet 152 rotates, ensuring that the turntable 110 can operate continuously, and thus more accurately guiding the process materials into the adsorption valve inner bed layer and discharging them from the bed layer, improving the processing capacity of the simulated moving bed process system, improving production efficiency, and reducing production costs.

[0118] Unless otherwise defined, the technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the technical field of the present invention. The terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. Terms such as "portion" and "part" as used herein can represent both a single part and a combination of multiple parts. Terms such as "mounted" and "arranged" as used herein can represent both a component being directly attached to another component and a component being attached to another component through an intermediate member. The features described in one embodiment herein can be applied to another embodiment alone or in combination with other features, unless the feature is not applicable or otherwise stated in that other embodiment.

[0119] The present invention has been described through the above embodiments. However, it should be understood that the above embodiments are only for the purpose of illustration and example, and are not intended to limit the present invention to the scope of the described embodiments. In addition, those skilled in the art can understand that the present invention is not limited to the above embodiments, and more variations and modifications can be made according to the teachings of the present invention, and these variations and modifications all fall within the scope of protection required by the present invention. The scope of protection of the present invention is defined by the appended claims and their equivalent scope.

Claims

1. A rotary valve, characterized in that, The swing valve includes: A turntable, a fixed plate and a sealing plate; A driving device, the driving device includes a servo motor; A swing arm, the swing arm is connected to the driving device, and the servo motor drives the swing arm to swing; A ratchet wheel, the ratchet wheel is fixedly connected to the turntable, and an angle sensor is arranged on the ratchet wheel for detecting the rotation angle of the ratchet wheel; A pawl, the pawl includes a connecting end and a free end, the connecting end is connected to the swing arm, and the free end is used to abut against the teeth of the ratchet wheel. The swing arm swings to drive the pawl to swing, so that the pawl pushes the ratchet wheel to rotate to drive the turntable to rotate; A first protrusion and a second protrusion, the first protrusion and the second protrusion are respectively arranged on two opposite sides of the swing arm; and A starting limit member and a terminating limit member, both the starting limit member and the terminating limit member are members separated from the ratchet wheel and are respectively located on both sides of the swing arm, wherein, the swing of the swing arm drives the first protrusion to move towards the starting limit member so that the first protrusion abuts against the starting limit member, and the swing of the swing arm drives the second protrusion to move towards the terminating limit member so that the second protrusion abuts against the terminating limit member, thereby enabling the turntable to rotate a predetermined angle; The swing valve further includes a control device, the control device is electrically connected to both the angle sensor and the driving device, the control device is configured to control the swing amplitude of the swing arm according to the angle fed back by the angle sensor, and the control device is configured to control the movement of the servo motor according to the abutment of the first protrusion against the starting limit member and / or according to the abutment of the second protrusion against the terminating limit member; The swing valve further includes a limit frame, the limit frame is provided with a guide groove, the guide groove is provided with the starting limit member and the terminating limit member and both the starting limit member and the terminating limit member are movable relative to the guide groove; The angle sensor detects the actual movement angle of the ratchet wheel and feeds the actual movement angle back to the control device to determine whether the actual movement angle reaches a set value, and the set value is equal to or less than the predetermined angle; If the actual movement angle reaches the set value, the control device controls the pawl to move in the reverse direction and determines whether the actual movement angle deviation is greater than an error value, and the actual movement angle deviation is the difference between the actual movement angle and the set value; If the actual movement angle deviation is less than the error value, the control device controls the pawl to move in the forward direction; If the actual movement angle deviation is greater than the error value, the control device issues a correction instruction to adjust the expansion and contraction amount of the piston rod of the driving device during the next movement; If the actual movement angle does not reach the set value, the control device controls the ratchet wheel and the pawl to continue to move forward, and the second protrusion continues to move towards the terminating limit member; If the second protrusion does not abut against the terminating limit member, the control device controls the pawl to move in the forward direction; If the second protrusion abuts against the terminating limit member, the ratchet wheel and the pawl stop moving and the control device controls the output shaft of the driving device to return.

2. The rotary valve according to claim 1, wherein, Below the ratchet is provided with an angle indicator disc. The ratchet and the angle indicator disc are coaxially arranged and are both connected to the turntable through a central shaft.

3. The rotary valve according to claim 1 or 2, characterized in that, The fixed disc is arranged below the turntable, and the turntable is rotatable relative to the fixed disc.

4. The rotary valve according to claim 3, characterized in that, The fixed disc is provided with a first pipeline and a second pipeline. The turntable is provided with an intermediate pipeline. The intermediate pipeline rotates with the rotation of the turntable, and the intermediate pipeline is used to connect the first pipeline and the second pipeline.

5. The rotary valve according to claim 4, characterized in that, It includes a plurality of first pipelines. The swing arm drives the turntable to rotate by different angles so that the intermediate pipeline is connected to different first pipelines.

6. The rotary valve according to claim 3, characterized in that, The sealing plate is arranged between the turntable and the fixed disc and is connected to the turntable.

7. A control method for a rotary valve according to claim 1, characterized in that, It includes: The control device controls the piston rod of the driving device to move, so as to drive the ratchet pawl and the ratchet to move forward and the second protruding member to move towards the end stop member; The angle sensor detects the actual movement angle of the ratchet and feeds back the actual movement angle to the control device; Judge whether the actual movement angle reaches the set value; If the actual movement angle reaches the set value, the control device controls the ratchet pawl to move in the reverse direction; If the actual movement angle does not reach the set value, the ratchet pawl and the ratchet continue to move forward.

8. The control method according to claim 7, wherein If the actual movement angle reaches the set value, the control device controls the ratchet pawl to move in the reverse direction and judges whether the deviation of the actual movement angle is greater than the error value.

9. The control method according to claim 8, wherein If the deviation of the actual movement angle is less than the error value, the control device controls the ratchet pawl to move forward; If the deviation of the actual movement angle is greater than the error value, the control device issues a correction instruction to adjust the telescopic amount of the piston rod of the driving device during the next movement.

10. The control method according to claim 7, characterized in that, If the actual movement angle does not reach the set value, the control device controls the ratchet and the ratchet pawl to continue to move forward, and the second protruding member continues to move towards the end stop member.

11. The control method according to claim 10, wherein If the second protruding member does not abut against the end stop member, the control device controls the ratchet pawl to move forward; If the second protruding member abuts against the end stop member, the ratchet and the ratchet pawl stop moving and the control device controls the output shaft of the driving device to return.

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