WO2021237674A1

WO2021237674A1 - Rotary valve and control method

Info

Publication number: WO2021237674A1
Application number: PCT/CN2020/093258
Authority: WO
Inventors: 甘泉; 侯守坤; 刘世俊; 朱国庆
Original assignee: 上海船用柴油机研究所; 上海齐耀热能工程有限公司
Priority date: 2020-05-29
Filing date: 2020-05-29
Publication date: 2021-12-02
Also published as: CN114072605A

Abstract

A rotary valve (100), comprising a rotating disk (110), a swing arm (131), a ratchet wheel (152), a pawl (151), a first protruding member (132), a second protruding member (133), a start limiting member (142), and an end limiting member (143). Both the start limiting member and the end limiting member are components separated from the ratchet wheel, and are respectively located on both sides of the swing arm. The swing arm swings to drive the first protruding member to move towards the start limiting member, so that the first protruding member abuts against the start limiting member. The swing arm swings to drive the second protruding member to move towards the end limiting member, so that the second protruding member abuts against the end limiting member, and thus the rotating disk is rotated at a predetermined angle. The rotary valve has high reliability, and can be adjusted online in real time for accurately feeding back the actual movement angle of the rotating disk, and ensuring that the rotating disk can be rotated at the predetermined angle, and the movement position and angle of the pawl can be calibrated timely. Also disclosed is a control method for the rotary valve.

Description

Rotary valve and control method

manual

Technical field

The present invention relates to the technical field of valves, in particular to a rotary valve and a control method.

Background technique

The rotary valve is mainly used in the simulated moving bed process in the petrochemical industry. It is the key equipment to realize the continuous adsorption and separation process and purify the desired product. Existing rotary valves usually rely on hydraulic systems to provide power, but hydraulic parts are prone to problems such as hydraulic oil leakage, jamming between parts, jamming or signal interruption of the electromagnetic four-way spool, and damage to hydraulic cylinder components. At the same time, the turntable of the rotary valve still has the problem of not being able to operate continuously, and it is not easy to accurately control the angle. The instantaneous error and error accumulation generated by the ratchet wheel of the rotary valve during rotation cannot be eliminated, which limits the processing capacity of the simulated moving bed process system. This leads to a reduction in production efficiency and a substantial increase in production costs.

Therefore, it is necessary to provide a rotary valve and a control method to at least partially solve the above-mentioned problems.

Summary of the invention

A series of simplified concepts are introduced in the content of the invention, which will be explained in further detail in the detailed implementation section. The inventive content part of the present invention does not mean an attempt to limit the key features and necessary technical features of the claimed technical solution, nor does it mean an attempt to determine the protection scope of the claimed technical solution.

In order to at least partially solve the above-mentioned problems, according to the first aspect of the present invention, a rotary valve is provided, the rotary valve comprising:

Turntable, fixed plate and 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, the ratchet is fixedly connected with the turntable;

A pawl, the pawl includes a connecting end and a free end, the connecting end is connected to the swing arm, the free end is used to abut against the teeth of the ratchet, the swing arm swings to drive the pawl Swing, so that the pawl pushes the ratchet wheel to rotate to drive the turntable to rotate;

A first protruding piece and a second protruding piece, the first protruding piece and the second protruding piece are respectively arranged on two opposite sides of the swing arm; and

An initial limiter and an end limiter, the initial limiter and the end limiter are both separate components from the ratchet, and are respectively located on both sides of the swing arm,

Wherein, the swinging of the swing arm drives the first protruding member to move toward the initial limiting member so that the first protruding member and the initial limiting member abut against each other, and the swinging arm drives the The second protruding member moves toward the end limiting member to make the second protruding member and the end limiting member abut, so that the turntable rotates by a predetermined angle.

According to the rotary valve of the present invention, the initial limit member and the end limit member act as mechanical limits on the swing arm swing and the rotation of the turntable, with high reliability, real-time online adjustment, and accurate feedback of the actual movement angle of the turntable. It is ensured that the turntable can rotate at a predetermined angle, and the movement position and angle of the pawl can be calibrated in time.

Optionally, an angle sensor is provided on the ratchet. Thus, the rotation angle is detected.

Optionally, it further includes a control device that 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 motion angle fed back by the angle sensor, thereby calibrating the position and angle of the pawl motion in real time, and can adjust the rotation angle and actual position of the ratchet wheel and the turntable to achieve staged zero error.

Optionally, it further includes a control device which is electrically connected to the driving device, and the control device is configured to abut against the starting limiter according to the first protrusion and/or according to the The second protruding part and the terminating limit part abut to control the movement of the servo motor. This ensures that the turntable can rotate a predetermined angle.

Optionally, an angle indicator disc is arranged under the ratchet wheel, and the ratchet wheel and the angle indicator disc are coaxially arranged and are both connected to the turntable through a central axis. This ensures the accuracy of the detected angle.

Optionally, it further includes a limit frame, the limit frame is provided with a guide groove, the guide groove is provided with the initial limit element and the end limit element, and the initial limit element and the The terminating limiter is movable relative to the guide groove. Thereby, the positions of the start limit piece and the end limit piece can be flexibly adjusted.

Optionally, the fixed plate is arranged below the turntable, and the turntable is rotatable relative to the fixed plate. From this, the material can be distributed.

Optionally, the fixed plate is provided with a first pipe and a second pipe, the turntable is provided with an intermediate pipe, the intermediate pipe rotates with the rotation of the turntable, and the intermediate pipe is used to communicate with the second pipe. A pipe and the second pipe. This facilitates the distribution of materials.

Optionally, a plurality of first pipes are included, and the swing arm drives the turntable to rotate at different angles so that the intermediate pipes communicate with different first pipes. This facilitates the distribution or isolation of materials.

Optionally, the sealing plate is arranged between the turntable and the fixed plate, and is connected to the turntable. In this way, the sealing contact between the turntable and the fixed plate is ensured.

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

The control device controls the movement of the piston rod of the driving device to drive the pawl and the ratchet to move in the positive direction and the second protruding piece to move in the direction of the stop limit piece;

The angle sensor detects the actual movement angle of the ratchet wheel 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 pawl to move in reverse;

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

According to the control method of the present invention, for the above-mentioned rotary valve, the electronic control system and the mechanical limit system work at the same time, with high reliability, real-time online adjustment, and accurate feedback of the actual movement angle of the ratchet, thereby ensuring that the turntable can rotate at a predetermined angle , And can calibrate the movement position and angle of the pawl in time.

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

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

If the deviation of the actual movement angle is greater than the error value, the control device issues a correction command to adjust the expansion and contraction of the piston rod of the driving device.

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

Optionally, 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 in the positive direction, and the second protruding piece continues to move toward the termination limit piece. In this way, the second protruding part and the end limiting part can prevent the ratchet wheel from rotating at an excessively large angle, which enhances safety and is more reliable.

Optionally, if the second protruding member does not conflict with the terminating limit member, the control device controls the pawl to move forward;

If the second protruding member abuts against the end limiting member, the ratchet wheel and the pawl stop moving and the control device controls the output shaft of the driving device to return.

Description of the drawings

The following drawings of the present invention are used here as a part of the present invention for understanding the present invention. The accompanying drawings show the embodiments and descriptions of the present invention, which are used to explain the device and principle of the present invention. In the attached drawing,

Figure 1 is a longitudinal cross-sectional view of a preferred rotary valve according to the present invention;

Figure 2 is a schematic diagram of the material pipeline of the rotary valve shown in Figure 1;

Figure 3 is a partial schematic top view of the rotary valve shown in Figure 1; and

Fig. 4 is a control logic diagram for the control method of the rotary valve according to the present invention.

Description of reference signs:

100: Rotary valve 101: Valve cover

110: Turntable 111: Fix

112: Sealing plate 113: First pipeline

114: Second pipeline 116: Intermediate pipeline

117: Central axis 120: Drive device

121: Servo motor 122: Servo electric cylinder

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

132: The first protruding part 133: The second protruding part

141: Limiting frame 142: Starting limiter

143: Termination limiter 144: Guide groove

151: ratchet claw 152: ratchet

160: Control device 161: Angle sensor

162: Angle indicator plate

Detailed ways

In the following description, a lot of specific details are given in order 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 examples, in order to avoid confusion with the present invention, some technical features known in the art are not described.

In order to thoroughly understand the present invention, a detailed structure will be proposed in the following description to explain the present invention. Obviously, the implementation of the present invention is not limited to the specific details familiar to those skilled in the art. The preferred embodiments of the present invention are described in detail as follows. However, in addition to these detailed descriptions, the present invention may also have other embodiments, which should not be construed as being limited to the embodiments presented here.

It should be understood that the purpose of the terms used herein is only to describe specific embodiments and not as a limitation of the present invention. The singular forms of "a", "an" and "said/the" are also intended to include plural forms, unless The context clearly indicates another way. When the terms "comprising" and/or "including" are used in this specification, they indicate the presence of the described features, wholes, steps, operations, elements, and/or components, but do not exclude the presence or addition of one or more other features, Whole, steps, operations, elements, components, and/or combinations thereof. The terms "upper", "lower", "front", "rear", "left", "right" and similar expressions used in the present invention are for illustrative purposes only and are not limiting.

The ordinal words such as "first" and "second" quoted in the present invention are merely identifications and do not have any other meanings, such as a specific order. Also, for example, the term “first component” itself does not imply the existence of “second component”, and the term “second component” itself does not imply the existence of “first component”.

Hereinafter, specific embodiments of the present invention will be described in more detail with reference to the drawings. These drawings show representative embodiments of the present invention and do not limit the present invention.

As shown in Figure 1, 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 may be fixed on a stand (not shown) located on the side of the turntable 110. The driving device 120 is arranged above the turntable 110 in the height direction of the rotary valve 100. The turntable 110 may have a roughly disc structure. The height direction of the rotary valve 100 may be parallel to the axial direction of the turntable 110, and the radial direction of the rotary valve 100 may be parallel to the radial direction of the turntable 110.

As shown in conjunction with FIG. 3, the driving device 120 may include a servo motor 121, and the servo motor 121 may drive the turntable 110 to rotate. Specifically, the driving device 120 further includes a servo electric cylinder 122, and the servo motor 121 can be connected with the servo electric cylinder 122 to drive the servo electric cylinder 122 to operate. The servo motor 121 and the servo electric cylinder 122 may 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. In this way, the rotary 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 telescopically move in the horizontal direction. The connection mode of the servo motor 121 and the servo electric cylinder 122 is an existing connection mode, which will not be repeated here.

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

In this way, the servo motor 121 and the servo electric cylinder 122 provide power to improve reliability, avoid failures caused by oil leakage and blockage of the existing hydraulic system, and avoid downtime caused by regular replacement of the filter system and solenoid valve maintenance. Further, the servo control system (servo motor 121, servo electric cylinder 122, control device 160 and corresponding angle, displacement, and torque sensing devices) adopts closed-loop servo control, which has high control accuracy, accurate angle, displacement, and torque measurement accuracy, and response Time is fast.

Further, the rotary valve 100 further includes a swing arm 131, and the swing arm 131 is arranged above the rotary disc 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 may be hinged with 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 the piston rod 123 of the servo electric cylinder 122 can move in the horizontal direction, the swing arm 131 can move in the horizontal direction. Direction swing.

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

Specifically, the pawl 151 includes a connecting end and a free end, and 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 swing direction of the pawl 151 is the same as the swing 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, the piston rod 123 of the servo electric cylinder 122 telescopically moves in the horizontal direction, the swing arm 131 swings back and forth in the horizontal direction, and the pawl 151 can also swing back and forth in the horizontal direction along with the swing arm 131.

The free end of the pawl 151 is used to abut against the teeth of the ratchet wheel 152, so that the swinging of the swing arm 131 can drive the pawl 151 to swing, so that the pawl 151 pushes the ratchet wheel 152 to rotate around the central axis of the ratchet wheel 152 in the first direction D1. The ratchet wheel 152 may be fixedly connected to the turntable 110. The central axis of the ratchet wheel 152 may coincide with the central axis of the turntable 110. That is, the ratchet wheel 152 and the turntable 110 may be coaxially arranged. The direction of the first direction D1 is schematically drawn in FIG. 3, which does not refer to a specific orientation, but is drawn schematically, only to facilitate the description of this specific embodiment.

The rotary valve 100 also includes a fixed plate, a sealing plate, and a central shaft 117. The sealing plate and the rotary plate are connected together, and both the sealing plate and the rotary plate can rotate relative to the fixed plate. The fixed plate and the sealing plate will be described in detail later. The ratchet wheel 152 is connected to the turntable 110 through the central shaft 117. The central shaft 117 can be fixedly connected to both the ratchet wheel 152 and the turntable 110. In this embodiment, "fixed connection" means that the ratchet wheel 152 and the turntable 110 are relatively fixed, that is, the ratchet wheel 152 and the turntable 110 are stationary with each other, but the ratchet wheel 152 and the turntable 110 can be detached. In this way, swinging of the swing arm 131 can drive the pawl 151 to swing, so that the pawl 151 pushes the ratchet wheel 152 to rotate to drive the turntable 110 to rotate.

The specific moving process is as follows:

As shown in Figure 3, 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 wheel 152, so that the pawl 151 The ratchet wheel 152 is pushed 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.

When the piston rod 123 of the servo electric cylinder 122 is retracted, the swing arm 131 swings, and the pawl 151 also swings together with the swing arm 131. The pawl 151 moves along the second direction D2 to the position of the next tooth, and the pawl 151 does not apply a pushing force to the ratchet wheel 152. At this time, the pawl 151 moves, and neither the ratchet wheel 152 nor the turntable 110 rotates. The direction of the second direction D2 is schematically drawn in FIG. 3, which does not refer to a specific orientation, but is drawn schematically, only to facilitate the description of this specific embodiment.

In this way, under the telescoping 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 wheel 152 to perform an intermittent stepped rotation movement in the first direction D1.

Further, the swing arm 131 includes two side surfaces opposite to 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 rotary valve 100 further includes a first protruding piece 132 and a second protruding piece 133, the first protruding piece 132 and the second protruding piece 133 are respectively arranged on two opposite sides of the swing arm 131. The first protrusion 132 and the second protrusion 133 are both fixedly connected to the swing arm 131. For example, the first protrusion 132 and the second protrusion 133 can be connected to the swing arm 131 by welding. The protruding piece 132 and the second protruding piece 133 can swing with the swing arm 131. Preferably, both the first protrusion 132 and the second protrusion 133 are configured as triangular plates, thereby ensuring stability. The corners of the first protruding piece 132 and the second protruding piece 133 may both be configured as rounded corners to avoid damage.

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

The limit frame 141 is provided with a guide groove 144, and the guide groove 144 is provided with an initial limit member 142 and an end limit member 143, and both the initial limit member 142 and the end 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 start stopper 142 and the end stopper 143 can slide in the guide groove 144, and can be adjusted to predetermined positions and then fixed. Thus, the swing amplitude of the swing arm 131 can be adjusted. In this embodiment, the “predetermined position” refers to the positions where the start stopper 142 and the end stopper 143 are respectively set.

Further, as shown in FIG. 1, an angle indicating plate 162 is provided under the ratchet wheel 152, and the angle indicating plate 162 is coaxially arranged with the ratchet wheel 152 and both are connected to the turntable 110 through a central shaft 117. The angle indicating plate 162 is arranged above the turntable 110 so as to be able to indicate angle information in real time with high reliability. Specifically, the angle indicating disc 162 includes a disc surface and a pointer, and the disc surface is connected with the central shaft 117 and the ratchet wheel 152. The rotation of the ratchet wheel 152 drives the disc surface to rotate relative to the pointer, so that the pointer indicates the angle of rotation of the ratchet wheel 152. The top of the central shaft 117 in the height direction of the rotary valve 100 passes through the center of the ratchet wheel 152 and the angle indicating plate 162 and is connected to the ratchet wheel 152 and the angle indicator plate 162. 110 connections. The turntable 110 can rotate in synchronization with the ratchet wheel 152. The central shaft 117 may be formed by a multi-segment shaft connected by a coupling.

The control device 160 may be configured to control the movement of the servo motor 121 according to the conflict between the first protrusion 132 and the initial limit member 142. Specifically, now returning to FIG. 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 protrusion 132 to move in the direction of the initial stopper 142. The pawl 151 moves in the second direction D2. At this time, the ratchet wheel 152 does not rotate. The swing of the swing arm 131 drives the first protruding member 132 to abut the initial limit member 142, the piston rod 123 of the servo electric cylinder 122 stops retracting, and the swing arm 131 stops swinging. The control device feels that the movement stops and can make corresponding control operations. The control operation will be described later.

If the first protruding piece 132 does not touch the initial limit piece 142, the control device controls the servo motor 121 to run, thereby controlling the piston rod 123 of the servo electric cylinder 122 to continue to retract, increasing the swing range of the swing arm 131, and finally As a result, the first protruding member 132 and the initial limiting member 142 abut against each other. As a result, it can be ensured that the swing arm 131 swings to a position where it collides with the starting limiter 142, which has high reliability and can be adjusted online in real time.

The control device 160 may be configured to control the movement of the servo motor 121 according to the conflict between the second protruding member 133 and the termination limit 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 protrusion 133 to move in the direction of the stop limit 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 piece 133 to abut against the stop limit piece 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 feels that the movement stops and can make corresponding control operations.

When the preset displacement of the servo electric cylinder 122 does not cause the second protrusion 133 to touch the termination limit piece 143, 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 extend, that is, Increasing the displacement of the piston rod 123 of the servo electric cylinder 122 finally causes the second protruding member 133 to abut the end limiting member 143. As a result, it can be ensured that the turntable 110 can rotate at a predetermined angle, has high reliability, and can be adjusted online in real time.

As a result, the rotary valve 100 provided by the present invention can introduce process materials into different beds in order through different channels according to the designed cycle sequence and lead the process materials out of the bed, so as to continuously and periodically obtain high-purity product. In this way, the rotary valve 100 can continue to rotate according to the above process to ensure the continuous and continuous progress of the material distributing process. Through the control of the swing amplitude of the swing arm 131, the actual movement angle of the turntable 110 can be controlled.

The turntable 110 of the rotary valve 100 of the present invention is driven by a servo motor 121, and has a compact structure, a small footprint, environmental protection and safety, low energy consumption, low system noise, no pollution sources such as hydraulic oil, no large hydraulic station location, and light weight. It is easy to install, no additional cooling system and power station are required, and it does not pollute the environment.

According to the rotary valve 100 of the present invention, the rotary valve 100 includes a swing arm 131, a ratchet wheel 152, a pawl 151, a first protrusion, a second protrusion, a start limiting member 142 and an end limiting member 143, the swing arm The swing of 131 drives the first protrusion 132 to move toward the initial limiting member 142 so that the first protrusion 132 and the initial limiting member 142 abut against each other, and the swing arm 131 drives the second protrusion 133 toward the ending limit. The position member 143 moves in the direction so that the second protruding member 133 and the end limit member 143 abut, so that the turntable 110 (ratchet wheel 152) rotates a predetermined angle, and the start limit member 142 and the end limit member 143 are opposed to the swing arm 131 The swing and the rotation of the turntable 110 play the role of mechanical limit, which has high reliability. It can play a role in positioning when the electronic control system fails, and can be adjusted online in real time to achieve accurate feedback of the actual movement angle of the turntable 110, ensuring that the turntable 110 and The ratchet wheel 152 can be rotated by a predetermined angle, and the movement position and angle of the pawl 151 can be calibrated in time.

The ratchet wheel 152 may also be provided with an angle sensor 161 to detect the rotation angle of the ratchet wheel. Since the ratchet wheel 152 is coaxially and fixedly connected with the turntable 110, 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 feed back an angle signal to the control device 160. The control device 160 can perform corresponding control operations according to the angle fed back by the angle sensor 161. For example, the control device 160 may be configured to control the swing amplitude of the swing arm 131 according to the angle fed back by the angle sensor 161, thereby realizing dynamic response and positioning, identifying accumulated errors and calibrating through feedback.

When the angle fed back by the angle sensor 161 is less than the predetermined angle, the control device can control the servo motor 121 to move to increase the displacement of the piston rod 123 of the servo electric cylinder 122, thereby increasing the swing range of the swing arm 131, thereby increasing the ratchet 152 And the actual movement angle of the turntable 110.

In this way, the rotary valve 100 simultaneously controls the swing amplitude of the swing arm 131 and the actual movement angle of the ratchet wheel 152 and the turntable 110 through a mechanical limit and an electronic control system. The control device can control the swing amplitude of the swing arm 131 according to the angle of motion fed back by the angle sensor 161, thereby calibrating the position and angle of the pawl 151 in real time, and can adjust the rotation angle and actual position of the ratchet wheel 152 and the turntable 110 to achieve staged zero error. At the same time, mechanical positioning is performed in conjunction with the initial limit member 142 and the end limit member 143 to further ensure the accuracy of the positioning.

The control logic operation of the mechanical limit and the electronic control system will be described below in conjunction with Figure 4.

The control device 160 sends a command to the driving device 120 to make the driving device 120 operate. The control device 160 sends a command to the driving device 120, and the output shaft of the driving device 120 moves. Specifically, the control device 160 sends a command 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 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 reverse rotation and the piston rod 123 of the servo electric cylinder 122 to return.

The piston rod 123 of the servo electric cylinder 122 is connected with the swing arm 131, and the piston rod 123 of the servo electric cylinder 122 extends, and the swing arm 131 moves forward at this time. For ease of description, in this embodiment, the output shaft of the servo motor 121 rotates forward, which can drive the swing arm 131 to move forward. The output shaft of the servo motor 121 reverses, which can drive the swing arm 131 to move in the reverse direction. Of course, the respective structures of the servo motor 121 and the servo electric cylinder 122 can be adjusted so that the output shaft of the servo motor 121 rotates forward, and the swing arm 131 moves in the reverse direction; the output shaft of the servo motor 121 reverses, and the swing arm 131 forwards. Sports, this embodiment does not limit it.

The swing arm 131 is connected to the pawl 151, and the swing of the swing arm 131 can drive the pawl 151 to swing. 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, the pawl 151 moves in the forward direction, and the ratchet wheel 152 moves in the forward direction. As shown in FIG. 3, the ratchet wheel 152 can rotate in the first direction D1 (counterclockwise). Of course, the swing direction 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, which is not limited in the embodiment.

A second protrusion 133 is also provided on the swing arm 131. The swing arm 131 swings forward, which can drive the second protruding member 133 to move in the direction of the stop limiting member 143.

An angle sensor 161 is also provided on the ratchet wheel 152, and the angle sensor 161 can detect the actual movement angle of the ratchet wheel 152 and can feedback the actual movement angle to the control device 160. In this embodiment, the actual movement angle detected and fed back by the angle sensor 161 is the angle at which the ratchet wheel 152 is driven to rotate according to the extension of the piston rod 123 of the servo electric cylinder 122 preset by the control device 160.

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 a theoretical value of an angle preset for the rotation of the ratchet wheel 152. The set value may be equal to or smaller than the aforementioned predetermined angle. In this way, the angle is controlled more accurately. Based on the mechanical swing of the swing arm 131, the actual movement angle is deviated from the set value.

When the control device 160 controls the reverse movement of the pawl 151, the control device 160 will also determine whether the deviation of the actual movement angle of the rotation of the ratchet wheel 152 is greater than the error value. The actual movement angle deviation is the difference between the actual movement angle and the set value. As a result, the rotation accuracy of the ratchet wheel 152 is further improved. The specific judgment process is as follows:

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 of the output shaft of the drive 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 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, thereby adjusting the actual movement angle of the next rotation of the ratchet wheel 152.

For example, the control device 160 can send a signal to the servo motor 121 to reduce the extension of the piston rod 123 of the servo electric cylinder 122, thereby reducing the swing amplitude of the next movement of the pawl 151, so that the next rotation of the ratchet wheel 152 is actually The movement angle is reduced, thereby compensating the angle that the ratchet wheel 152 exceeded during the last movement. In this way, multi-level adjustment of the actual rotation angle of the ratchet wheel 152 is realized, and the accuracy of the rotation of the ratchet wheel 152 is ensured.

Of course, in the embodiment not shown, the swinging direction of the swing arm, the pawl, and the direction of the teeth of the ratchet wheel can also be adjusted, so that when the piston rod of the servo electric cylinder is retracted, 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 swing amplitude of the next movement of the ratchet, so that the ratchet The actual movement angle of the next rotation is reduced to compensate for the angle that the ratchet wheel exceeded during the previous movement.

ii) If the actual movement angle deviation is less than the error value, the control device 160 controls the pawl 151 to move in the positive direction. For example, when the setting 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. This cycle of action.

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 protruding member 133 continues to move toward the direction of the stop limiting member 143.

In the state where the actual movement angle does not reach the set value, if the second protruding member 133 does not abut 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 positive movement.

In the state where the actual movement angle does not reach the set value, if the second protruding member 133 conflicts with the end limit member 143, it can be determined that the angle sensor 161 and other electronic control equipment are malfunctioning at this time, which causes the electronic control limit to fail. 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 send an alarm signal to remind the operator. In this way, the second protruding member 133 and the end limiting member 143 can prevent the ratchet wheel 152 from rotating at an excessively large angle, which enhances safety and is more reliable.

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 reverse, and the first protrusion 132 faces the initial limiter Move in the direction of 142. The swing of the swing arm 131 drives the first protrusion 132 to abut the initial limit piece 142, the piston rod 123 of the servo electric cylinder 122 stops retracting, and the swing arm 131 stops swinging.

If the first protruding member 132 does not touch the initial limit member 142, the control device controls the servo motor 121 to continue to run, so as to control the piston rod 123 of the servo electric cylinder 122 to continue to retract and increase the swing range of the swing arm 131 , Finally, the first protruding member 132 and the initial limiting member 142 abut against each other. As a result, it can be ensured that the swing arm 131 swings to a position where it collides with the starting limiter 142, which has high reliability and can be adjusted online in real time.

In this way, when the electronic control limit fails, the mechanical limit (the second protruding member 133 and the end limit member 143, as well as the first protruding member 132 and the initial limit member 142) can act as another prevention and control. Avoid excessive rotation of the ratchet wheel 152, thereby avoiding excessive rotation of the turntable.

As shown in FIG. 1, the fixed plate 111 is arranged below the turntable 110. The platen 111 may be configured in a substantially disc shape. A valve cover 101 can also be provided above the turntable 110, and the valve cover 101 can be buckled on the fixed plate 111 and form a closed cavity. The turntable 110 is rotatable relative to the fixed plate 111, thereby effectively distributing materials.

Specifically, the fixed plate 111 is provided with a first pipe 113 and a second pipe 114, and both the first pipe 113 and the second pipe 114 are fixedly connected to the lower surface of the fixed plate 111. Both the first pipe 113 and the second pipe 114 can transport materials. An intermediate pipe 116 is provided on the turntable 110, and the intermediate pipe 116 can rotate with the rotation of the turntable 110, and the intermediate pipe 116 can communicate with the first pipe 113 and the second pipe 114. In this way, the material in the first pipe 113 can enter the second pipe 114 through the intermediate pipe 116, or the material in the second pipe 114 can enter the first pipe 113 through the intermediate pipe 116, so as to facilitate the distribution of materials. The valve cover 101 may be provided with a central shaft 117, a turntable 110, an intermediate pipe 116, etc., so as to ensure the sealing performance.

Furthermore, as shown in Figs. 1 and 2, the rotary valve 100 includes a plurality of first pipes 113 and a plurality of second pipes 114, thereby forming a multi-channel material rotary valve. In order to keep the page concise, only one second pipe 114 is shown in FIG. 1. The plurality of first pipes 113 may be arranged at intervals around the circumferential direction of the turntable 110, and the intermediate pipe 116 may be communicated with different first pipes 113. The second pipes 114 may also be arranged at intervals around the circumferential direction of the turntable 110, and the intermediate pipes 116 may be connected to different second pipes 114. The swing arm 131 drives the pawl 151 to move, and the pawl 151 moves in the first direction D1 to push the ratchet wheel 152 to rotate, thereby driving the turntable 110 to rotate. The swing arm 131 can drive the turntable 110 to rotate at different angles, so that the intermediate pipe 116 rotates at different angles. According to the actual situation, the intermediate pipe 116 can connect the preset first pipe 113 and the second pipe 114.

The rotary valve 100 may further include a plurality of intermediate pipes 116, which can rotate at different angles with the turntable 110, so that different intermediate pipes 116 are respectively connected to different first pipes 113 and second pipes 114.

The inlet end and the outlet end of the different intermediate pipes 116 can be respectively communicated with the different first pipe 113 and the second pipe 114, and the connected pipes can be switched through the turntable 110 to rotate. When the central shaft 117 (turntable 110) rotates to different positions, the materials from different first pipes 113 can communicate with different second pipes 114 through different intermediate pipes 116, or from different second pipes 114. The materials can be respectively communicated with different first pipes 113 through different intermediate pipes 116.

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 rotation of the turntable 110, so as to achieve a sealed contact between the turntable 110 and the fixed plate 111. The sealing plate 112 rotates with the turntable 110, and the first pipe 113 and the second pipe 114 that are not connected can be separated by the sealing plate 112.

The chemical process materials can be input into the intermediate pipe 116 through the second pipe 114, and then into the first pipe 113 through the intermediate pipe 116, so as to be transported to a designated device. The flow direction of the material in the rotary valve 100 is bidirectional. The material can also be input into the intermediate pipe 116 through the first pipe 113, and then into the second pipe 114 through the intermediate pipe 116, and finally discharged through the second pipe 114.

For example, the plurality of first pipes include a first branch pipe and a second branch pipe, the plurality of intermediate pipes include a third branch pipe and a fourth branch pipe, and the plurality of second pipes include a fifth branch pipe and a sixth branch pipe. A sub-pipe can be communicated with the fifth sub-pipe through the third sub-pipe, and the second sub-pipe can be connected with the sixth sub-pipe through the fourth sub-pipe. When the first sub-pipe is communicated with the fifth sub-pipe through the third sub-pipe, the second sub-pipe and the sixth sub-pipe may be separated by the sealing plate and not communicated.

In this way, the rotary valve 100 provided by the present invention can realize the input and output of chemical materials according to a certain distribution method. The electronic control system can provide power. The central shaft 117 is driven to rotate through the ratchet wheel 152 and pawl 151 mechanism, and the central shaft 117 drives the turntable 110 to rotate step by step, so as to realize the communication and switching between the various material pipelines, and the actual performance of the ratchet wheel 152 can be adjusted and calibrated. The angle of motion effectively eliminates the instantaneous error and error accumulation generated by the ratchet wheel 152 during rotation, and ensures the continuous operation of the turntable 110, thereby more accurately introducing the process materials into and out of the bed in the adsorption valve, improving the simulation movement The processing capacity of the bed process system improves production efficiency and reduces production costs.

Unless otherwise defined, the technical and scientific terms used herein have the same meanings as commonly understood by those skilled in the technical field of the present invention. The terminology used herein is only for describing specific implementation purposes, and is not intended to limit the present invention. The terms such as "part" and "piece" appearing in this text can mean a single part or a combination of multiple parts. Terms such as "installation" and "setting" appearing in this document can either mean that one component is directly attached to another component, or that one component is attached to another component through an intermediate piece. 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 in the other embodiment or otherwise stated.

The present invention has been described through the above-mentioned embodiments, but it should be understood that the above-mentioned embodiments are only for the purpose of example and description, 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-mentioned embodiments, and more variations and modifications can be made according to the teachings of the present invention, and these variations and modifications fall under the protection of the present invention. Within the range. The protection scope of the present invention is defined by the appended claims and their equivalent scope.

Claims

A rotary valve, characterized in that the rotary valve comprises:

Turntable, fixed plate and 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, the ratchet is fixedly connected with the turntable;

A pawl, the pawl includes a connecting end and a free end, the connecting end is connected to the swing arm, the free end is used to abut against the teeth of the ratchet, the swing arm swings to drive the pawl Swing, so that the pawl pushes the ratchet wheel to rotate to drive the turntable to rotate;

A first protruding piece and a second protruding piece, the first protruding piece and the second protruding piece are respectively arranged on two opposite sides of the swing arm; and

An initial limiter and an end limiter, the initial limiter and the end limiter are both separate components from the ratchet, and are respectively located on both sides of the swing arm,

Wherein, the swinging of the swing arm drives the first protruding member to move toward the initial limiting member so that the first protruding member and the initial limiting member abut against each other, and the swinging arm drives the The second protruding member moves toward the end limiting member to make the second protruding member and the end limiting member abut, so that the turntable rotates by a predetermined angle.
The rotary valve according to claim 1, wherein an angle sensor is provided on the ratchet.
The rotary valve according to claim 2, further comprising a control device electrically connected to both the angle sensor and the drive device, and the control device is configured to provide feedback based on the angle sensor The angle controls the swing amplitude of the swing arm.
The rotary valve according to claim 1, further comprising a control device electrically connected to the driving device, and the control device is configured to interact with the starter according to the first protrusion The position-limiting member is offset and/or the movement of the servo motor is controlled according to the offset of the second protruding member and the end-limiting member.
The rotary valve according to claim 1, characterized in that an angle indicator disc is arranged under the ratchet wheel, and the ratchet wheel and the angle indicator disc are arranged coaxially and are both connected to the turntable through a central axis.
The rotary valve according to claim 1, further comprising a limit frame, the limit frame is provided with a guide groove, and the guide groove is provided with the start limit piece and the end limit piece In addition, both the initial limiting member and the ending limiting member are movable relative to the guide groove.
The rotary valve according to any one of claims 1 to 6, wherein the fixed plate is arranged below the rotary plate, and the rotary plate is rotatable relative to the fixed plate.
The rotary valve according to claim 7, wherein the fixed plate is provided with a first pipe and a second pipe, the turntable is provided with an intermediate pipe, and the intermediate pipe rotates with the rotation of the turntable, The intermediate pipe is used to connect the first pipe and the second pipe.
The rotary valve according to claim 8, characterized in that it comprises a plurality of first pipes, and the swing arm drives the turntable to rotate at different angles so that the intermediate pipes communicate with different first pipes.
The rotary valve according to claim 7, wherein the sealing plate is arranged between the rotary disc and the fixed plate, and is connected to the rotary disc.
A control method for the rotary valve according to claim 1, characterized in that it comprises:

The control device controls the movement of the piston rod of the driving device to drive the pawl and the ratchet to move in the positive direction and the second protruding piece to move in the direction of the stop limit piece;

The angle sensor detects the actual movement angle of the ratchet wheel 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 pawl to move in reverse;

If the actual movement angle does not reach the set value, the pawl and ratchet continue to move forward.
The control method according to claim 11, wherein if the actual movement angle reaches the set value, the control device controls the pawl to move in the reverse direction and judges whether the actual movement angle deviation is greater than the error value.
The control method according to claim 12, wherein:

If the actual movement angle deviation is less than the error value, the control device controls the pawl to move forward;

If the deviation of the actual movement angle is greater than the error value, the control device issues a correction command to adjust the expansion and contraction of the piston rod of the driving device during the next movement.
The control method according to claim 11, wherein 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 in the positive direction, and the second protrusion continues to move toward the termination limiter.
The control method according to claim 14, wherein:

If the second protruding piece does not conflict with the end limiting piece, the control device controls the pawl to move forward;

If the second protruding member abuts against the end limiting member, the ratchet wheel and the pawl stop moving and the control device controls the output shaft of the driving device to return.