Scraper type rotary valve

Abstract

The invention relates to the technical field of valve facilities, in particular to a scraper type rotary valve which comprises a valve body, and a valve element cavity is formed in the valve body. The valve element is rotationally arranged in the valve element cavity, and a plurality of material bearing grooves used for bearing materials are formed in the valve element; the cleaning mechanism is arranged at the discharging end of the valve body and located below the valve element, and the cleaning mechanism can rotate around the axis of the cleaning mechanism to clean and scrape away materials remaining on the inner wall of the material bearing groove. The driving mechanism is in transmission connection with the valve element and used for driving the valve element to rotate; the transmission mechanism is connected with the valve element and the cleaning mechanism. The cleaning mechanism synchronously rotating with the valve element is arranged, in the working process of the valve element, the scraper scrapes the material bearing groove in real time, materials, especially viscous materials which are prone to moisture absorption and caking, adhering to the groove wall can be effectively removed, bridging and accumulation of the materials can be remarkably prevented, the manual cleaning frequency is greatly reduced, the shutdown time is greatly shortened, and the cleaning efficiency is improved. And the production continuity is improved.

Description

Technical Field

[0001] This application relates to the field of valve assembly technology, and more particularly to a scraper rotary valve. Background Technology

[0002] Rotary valves, also known as rotary feeders or star-shaped discharge valves, are widely used in powder and granular material conveying systems in industries such as chemical, food, pharmaceutical, and plastics, serving as quantitative feeders and airlock seals.

[0003] In existing technologies, pull-out rotary valves are often used for ease of cleaning. The advantage of this type of valve is that the valve core can be completely pulled out of the valve body, making it easy to clean the valve body, material tank, and valve core. This makes it suitable for applications requiring frequent material changes or where strict hygiene requirements are necessary.

[0004] However, the pull-out rotary valve, due to its pull-out valve core design, suffers from poor sealing between the valve core and the valve body. During conveying, fine powder particles can easily leak out from the gaps, causing environmental pollution and material loss. Furthermore, for highly hygroscopic or adhesive materials, although the valve core can be pulled out, frequent shutdowns for manual cleaning are still necessary. The lack of self-cleaning function significantly reduces production efficiency, increases labor costs, and affects the continuous operation efficiency of the equipment. Moreover, materials leaking into the gaps can easily accumulate and harden, eventually leading to valve core jamming or overload damage to the drive mechanism. Summary of the Invention

[0005] This application provides a scraper-type rotary valve to solve the problems of poor sealing and high cleaning frequency of existing pull-out rotary valves.

[0006] This application provides a scraper-type rotary valve, comprising: Valve body, wherein a valve core cavity is provided inside the valve body; The valve core is rotatably disposed within the valve core cavity, and the valve core is provided with several material receiving grooves for receiving materials; A cleaning mechanism is located at the discharge end of the valve body, below the valve core. The cleaning mechanism can rotate around its own axis to clean and scrape off the material remaining on the inner wall of the material receiving trough. A drive mechanism, which is connected to the valve core in a transmission manner, is used to drive the valve core to rotate; A transmission mechanism connects the valve core and the cleaning mechanism, and the drive mechanism drives the valve core and the cleaning mechanism to rotate synchronously through the transmission mechanism.

[0007] Preferably, the cleaning mechanism includes a rotating shaft rotatable about its own axis and a scraper disposed on the rotating shaft, wherein: Both ends of the rotating shaft are rotatably mounted in the valve body; At least one scraper is provided, and the scrapers are evenly distributed on the outer surface of the rotating shaft along the circumference of the rotating shaft. A detachable cleaning head is provided at the end of the scraper away from the rotating shaft.

[0008] Preferably, the cleaning head is detachably connected to the scraper via an insertion groove on one side of the scraper, and the insertion groove is a non-through groove.

[0009] Preferably, the transmission mechanism includes a driving sprocket, a driven sprocket, and a transmission chain. The driving sprocket is disposed at one end of the valve core, and the driven sprocket is disposed at one end of the rotating shaft. The driving sprocket and the driven sprocket are connected by meshing through the transmission chain.

[0010] Preferably, the valve body is further provided with an elastic tensioning mechanism for tensioning the transmission chain. The elastic tensioning mechanism includes a tensioning sprocket, a sliding block, and a second elastic component. The tensioning sprocket meshes with the transmission chain, the sliding block drives the tensioning sprocket to slide, and the second elastic component provides elastic tension to the sliding block.

[0011] Preferably, it further includes an elastic adjustment component, wherein the cleaning mechanism is slidably disposed inside the valve body via the elastic adjustment component, and the elastic adjustment component is used to provide the cleaning mechanism with an elastic force that causes the scraper to come close to the valve core.

[0012] Preferably, the elastic adjustment component includes: The mounting groove is formed on opposite sides of the inner wall of the valve body along the length direction of the discharge end; Two mounting blocks are provided, which are slidably disposed in the valve body through the mounting groove. An elastic component is disposed between the mounting groove and the mounting block, with one end abutting against the inner wall of the mounting groove and the other end abutting against the bottom surface of the mounting block; The two ends of the rotating shaft are rotatably mounted in the mounting block via bearings.

[0013] Preferably, a shielding plate is provided on the side of the mounting block near the valve core, and the shielding plate is used to cover the opening of the mounting groove.

[0014] Preferably, the material receiving groove is an arc-shaped groove, and the cleaning head is an externally arc-shaped cylindrical body or arc-shaped block, and the edge radius of the cleaning head matches the radius of curvature of the material receiving groove; The cleaning head is made of wear-resistant material, and / or the surface of the material receiving groove is coated with a wear-resistant coating.

[0015] Preferably, it also includes a torque protector and a force sensor, wherein the torque protector is connected in series in the power output path of the drive mechanism, and the force sensor is used to detect the torque of the valve core or the cleaning mechanism.

[0016] The beneficial effects of this application are as follows: The scraper-type rotary valve of this application, by setting a cleaning mechanism that rotates synchronously with the valve core, scrapes the material receiving trough in real time during the operation of the valve core, which can effectively remove the material adhering to the trough wall. In particular, for sticky materials that are easy to absorb moisture and clump, it can significantly prevent material bridging and accumulation, greatly reduce the frequency of manual cleaning and downtime, and improve production continuity.

[0017] Furthermore, the cleaning head features a detachable connection via a connector slot and other structures, ensuring a secure connection to prevent it from being thrown out during high-speed rotation, while also facilitating quick replacement after wear, thus reducing maintenance costs. Simultaneously, the cleaning head utilizes wear-resistant materials such as high-carbon steel or ceramic coatings, further extending the service life of vulnerable parts. In particular, by adopting the traditional mode of fixed valve body and rotating valve core, a more reliable sealing structure can be used between the valve body and valve core compared with the pull-out structure. This effectively solves the problem of material leakage and air leakage caused by structural gaps in pull-out valves, ensuring stable system pressure and a clean working environment. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of the scraper-type rotary valve provided in the embodiments of this application; Figure 2 This is a front view of the cleaning mechanism and valve core in this application; Figure 3 This is a side view of the cleaning mechanism and the transmission mechanism in this application; Figure 4 This is a perspective view of the transmission mechanism in this application; Figure 5 This is a front view of the transmission mechanism in this application.

[0020] Figure label: 100. Valve body; 110. Sealing ring; 200. Valve core; 210. Material receiving groove; 300. Cleaning mechanism; 310. Rotating shaft; 320. Scraper; 321. Insertion groove; 330. Cleaning head; 331. Connecting key; 400. Drive mechanism; 500. Transmission mechanism; 510. Drive sprocket; 520. Driven sprocket; 530. Transmission chain; 540. Elastic tensioning mechanism; 541. Tensioning sprocket; 542. Sliding block; 543. Second elastic component; 600. Elastic adjustment component; 610. Mounting block; 611. Shielding plate; 620. Elastic component. Detailed Implementation

[0021] The technical solutions of this application will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0022] The following is combined with Figure 1-5 This describes the scraper-type rotary valve provided in the embodiments of this application.

[0023] Reference Figure 1 As shown in the embodiment of this application, the scraper-type rotary valve includes a valve body 100, a valve core 200, a cleaning mechanism 300, a drive mechanism 400, and a transmission mechanism 500. The valve body 100 serves as the supporting housing of the equipment, and has a cylindrical valve core cavity inside. The top of the valve body 100 is a feed inlet, and the bottom is a discharge outlet. The cleaning mechanism 300 is installed at one end of the discharge outlet of the valve body 100. A cleaning port can also be provided on the side wall of the valve body 100, and a sealable cover plate is bolted to the cleaning port to facilitate periodic cleaning of residual materials inside the valve body 100. A sealing ring 110 or a sealing gasket is provided between the valve body 100 and the valve core 200 to enhance the sealing performance. The inner wall of the valve body 100 can be coated with an anti-stick coating such as polytetrafluoroethylene to reduce material adhesion.

[0024] The valve core 200 is coaxially rotatably disposed in the valve core cavity. Several material receiving grooves 210 are evenly provided on the outer circumferential surface of the valve core 200 to receive the material falling from the feed port. In order to reduce the dead corner of material residue and facilitate the scraping of the scraper, the cross-section of the material receiving groove 210 is preferably an arc groove. One end of the valve core 200 passes through the valve body 100 and is connected to the drive mechanism 400 for transmission.

[0025] The drive mechanism 400 includes a drive motor, the output end of which is fixedly connected to the end of the valve core 200 via a coupling, providing power for the rotation of the valve core 200.

[0026] In some specific embodiments, the cleaning mechanism 300 is disposed at the discharge end of the valve body 100, below the valve core 200. (Refer to...) Figure 2 As shown, the cleaning mechanism 300 includes a rotating shaft 310, scrapers 320, and a cleaning head 330. The rotating shaft 310 is rotatably mounted inside the valve body 100 via bearings and a mounting structure. Multiple scrapers 320 are evenly distributed along the circumference of the rotating shaft 310, with their roots fixed to the rotating shaft 310. To reduce the transmission load on the transmission mechanism, multiple weight-reducing grooves extending to the other side of the scraper 320 can be provided, reducing its own weight and its obstruction of materials. An insertion groove 321 is provided at the end of the scraper 320 near the valve core 200. The insertion groove 321 is a dovetail groove or a cylindrical groove opened along the axial direction of the rotating shaft 310. When the insertion groove 321 is a cylindrical groove, a clearance groove with a width smaller than the diameter of the cylindrical groove is also provided radially along the cylindrical groove. The clearance groove extends to the outside of the scraper 320 to connect with the cleaning head 330. The cleaning head 330 is an arc-shaped block that matches the curvature of the material receiving groove 210. Its back is provided with a connecting key 331 that mates with the insertion groove 321. The connecting key 331 matches the length of the insertion groove but is shorter than the length of the cleaning head 330. The cleaning head 330 is inserted into the insertion groove 321 via the connecting key 331, achieving a detachable connection with the scraper 320. The cleaning head 330 is made of high-carbon steel or a wear-resistant material with a ceramic coating to extend its service life. The surface of the material receiving groove 210 can also be coated with a wear-resistant coating.

[0027] In some specific embodiments, the transmission mechanism 500 is used to synchronously transmit the power of the valve core 200 to the rotating shaft 310. The transmission mechanism 500 preferably employs a chain drive. Figure 4 and Figure 5 The valve body 100 includes a drive sprocket 510 fixed to the other end of the valve core 200, a driven sprocket 520 fixed to one end of the rotating shaft 310, and a transmission chain 530 wound around the drive sprocket 510 and the driven sprocket 520. To ensure the tension of the transmission chain 530, an elastic tensioning mechanism 540 is also provided on the valve body 100. This mechanism includes a sliding block 542, a second elastic component 543, and a tensioning sprocket 541. In this embodiment, the second elastic component is two symmetrically arranged compression springs. A groove is opened on the valve body 100. The sliding block 542 can drive the tensioning sprocket 541 to slide along the groove in a direction perpendicular to the axial direction of the valve core. One end of the compression spring abuts against the inner wall of the groove, and the other end pushes the sliding block 542, so that the tensioning sprocket 541 installed on the sliding block 542 always presses the transmission chain 530 and maintains its tension. Furthermore, the valve body is provided with a thickened area, and a transmission cavity is formed in the thickened area. The transmission mechanism is disposed in the transmission cavity to enhance its overall sealing performance.

[0028] In some specific embodiments, to enable the scraper 320 to better conform to the surface of the valve core 200 and achieve effective cleaning of stubborn materials, this embodiment also provides an elastic adjustment component 600, which includes a mounting groove, a mounting block 610, and an elastic component 620. (Refer to...) Figure 3 and Figure 4 A strip-shaped mounting groove is provided on the inner wall of the discharge end of the valve body 100. A mounting block 610 is slidably installed in the mounting groove. The two ends of the rotating shaft 310 are rotatably mounted on the mounting block 610 via bearings. An elastic component 620 is provided between the bottom of the mounting block 610 and the bottom wall of the mounting groove. The elastic component 620 consists of at least two symmetrically arranged compression springs or elastic dampers. The elastic component 620 provides a continuous elastic thrust, so that the entire cleaning mechanism 300 always tends to move closer to the valve core 200, thereby ensuring that the cleaning head 330 on the scraper 320 is in close contact with the inner wall of the material receiving groove 210 of the valve core 200. To prevent material from entering the mounting groove, a shielding plate 611 is also provided on the side of the mounting block 610 near the valve core 200, which can slide with the mounting block 610 and always cover the opening of the mounting groove.

[0029] Furthermore, to enhance the intelligence and safety of the equipment, a torque protector is connected in series on the shaft connecting the drive motor and the valve core 200. This protector automatically slips or disconnects when the torque exceeds a threshold. A force sensor is installed at the end of the shaft 310 or the valve core 200 to monitor torque in real time. By electrically connecting the force sensor and the drive motor to the corresponding control unit, when the force sensor detects an abnormal increase in torque, the control unit can also issue an alarm or control the drive motor to slow down or stop, thus preventing equipment damage.

[0030] By setting a torque protector, power can be cut off when materials clump together or the equipment is overloaded, protecting the motor and transmission mechanism from damage. In conjunction with force sensors and control units, the equipment load can be monitored in real time, enabling overload warnings or automatic shutdown. The speed can also be intelligently adjusted according to the load, achieving automated and safe operation of the equipment.

[0031] The working process is as follows: The drive mechanism 400 starts, driving the valve core 200 to rotate. The material enters the receiving groove 210 of the valve core 200 from the feed port and is discharged from the discharge port as the valve core 200 rotates. At the same time, through the transmission mechanism 500, the rotating shaft 310 rotates synchronously with the valve core 200, driving the scraper 320 and the cleaning head 330 to rotate. Under the action of the elastic adjustment component 600, the cleaning head 330 is in close contact with the inner wall of the receiving groove 210 to scrape and clean the adhered material in real time. The scraped material is discharged with the mainstream material. When encountering hard foreign objects or severe agglomeration of materials that causes a sharp increase in torque, the force sensor sends a signal, and the control unit controls the equipment to stop. The torque protector can disconnect the subsequent connection in time when the machine is overloaded, providing mechanical overload protection for the device.

[0032] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0033] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0034] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0035] In this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0036] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A scraper-type rotary valve, characterized in that, include: The valve body contains a valve core cavity; The valve core is rotatably disposed within the valve core cavity, and the valve core is provided with several material receiving grooves for receiving materials; A cleaning mechanism is located at the discharge end of the valve body, below the valve core. The cleaning mechanism can rotate around its own axis to clean and scrape off the material remaining on the inner wall of the material receiving trough. A drive mechanism, which is connected to the valve core in a transmission manner, is used to drive the valve core to rotate; A transmission mechanism connects the valve core and the cleaning mechanism, and the drive mechanism drives the valve core and the cleaning mechanism to rotate synchronously through the transmission mechanism.

2. The scraper-type rotary valve according to claim 1, characterized in that, The cleaning mechanism includes a rotating shaft that can rotate about its own axis and a scraper disposed on the rotating shaft, wherein: Both ends of the rotating shaft are rotatably mounted in the valve body; At least one scraper is provided, and the scrapers are evenly distributed on the outer surface of the rotating shaft along the circumference of the rotating shaft. A detachable cleaning head is provided at the end of the scraper away from the rotating shaft.

3. The scraper-type rotary valve according to claim 2, characterized in that, The cleaning head is detachably connected to the scraper via an insertion slot on one side of the scraper, and the insertion slot is a non-through slot.

4. The scraper-type rotary valve according to claim 2, characterized in that, The transmission mechanism includes a driving sprocket, a driven sprocket, and a transmission chain. The driving sprocket is located at one end of the valve core, and the driven sprocket is located at one end of the rotating shaft. The driving sprocket and the driven sprocket are connected by meshing through the transmission chain.

5. The scraper-type rotary valve according to claim 4, characterized in that, The valve body is also provided with an elastic tensioning mechanism for tensioning the transmission chain. The elastic tensioning mechanism includes a tensioning sprocket, a sliding block, and a second elastic component. The tensioning sprocket meshes with the transmission chain, the sliding block drives the tensioning sprocket to slide, and the second elastic component provides elastic tension to the sliding block.

6. The scraper-type rotary valve according to claim 1, characterized in that, It also includes an elastic adjustment component, the cleaning mechanism being slidably disposed inside the valve body via the elastic adjustment component, the elastic adjustment component being used to provide the cleaning mechanism with an elastic force that causes the scraper to come into contact with the valve core.

7. The scraper-type rotary valve according to claim 6, characterized in that, The elastic adjustment component includes: The mounting groove is formed on opposite sides of the inner wall of the valve body along the length direction of the discharge end; Two mounting blocks are provided, which are slidably disposed in the valve body through the mounting groove. An elastic component is disposed between the mounting groove and the mounting block, with one end abutting against the inner wall of the mounting groove and the other end abutting against the bottom surface of the mounting block; The two ends of the rotating shaft are rotatably mounted in the mounting block via bearings.

8. The scraper-type rotary valve according to claim 7, characterized in that, A shielding plate is provided on the side of the mounting block near the valve core, and the shielding plate is used to cover the opening of the mounting groove.

9. The scraper-type rotary valve according to claim 2, characterized in that, The material receiving trough is an arc-shaped trough, and the cleaning head is an externally arc-shaped cylindrical body or arc-shaped block. The edge radius of the cleaning head matches the radius of curvature of the material receiving trough. The cleaning head is made of wear-resistant material, and / or the surface of the material receiving groove is coated with a wear-resistant coating.

10. The scraper-type rotary valve according to claim 1, characterized in that, It also includes a torque protector and a force sensor, the torque protector being connected in series in the power output path of the drive mechanism, and the force sensor being used to detect the torque of the valve core or the cleaning mechanism.

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