Ore pulp knife gate valve

Abstract

The invention relates to the technical field of fluid control equipment, and particularly discloses an ore pulp knife gate valve which comprises an upper valve body, a middle valve body, a lower valve body, a valve plate and a driving unit and further comprises a composite guide unit, a medium channel is formed in the middle of the middle valve body, and the driving unit is connected with the valve plate. The driving unit is in transmission connection with the valve plate and drives the valve plate to reciprocate along the composite guide units at the two ends, the valve plate is provided with a wedge-shaped circulation opening and a material blocking part, when the wedge-shaped circulation opening is communicated with a medium channel, communication of pipeline equipment is achieved, and when the valve plate is arranged at the position of the medium channel through the material blocking part, isolation of the medium channel is achieved. The wedge-shaped circulation opening is formed above the material blocking part and matched with the medium channel, and when the knife gate valve is communicated, the material blocking part of the valve plate is located below the medium channel. The operation mode of the knife gate valve plate is changed, and the knife gate valve plate is pulled from bottom to top instead of being inserted from top to bottom, so that the valve plate is easy to close, the valve plate is prevented from being clamped, and the service life of the valve is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of fluid control equipment, in particular to a slurry knife gate valve. Background Art

[0002] The working principle of the slurry knife gate valve is that when the valve plate is opened, the symmetrical elastic rubber rings will squeeze and seal each other under high pressure load to form a valve pressure conduit, provide an interference-free flow channel, and protect metal parts from flow wear. The slurry knife gate valve is widely used in mining, metallurgy, electric power, chemical and other industries involving the transportation and control of media such as slurry and mortar.

[0003] The current slurry knife gate valve generally adopts a vertical downward plug-in sealing structure, which cuts off the medium by embedding the rubber seal rubber valve seat through the top-down movement of the valve plate. However, in actual operation, large particles of impurities such as coal slag and ore contained in the slurry or mortar are easy to form deposits on the sealing surface of the rubber valve seat. When the valve plate performs the downward closing operation, its end will be squeezed and contacted with the deposited hard particles, forcing the sharp particles to be embedded in the sealing ring, causing the rubber sealing surface to be sheared or scratched, and eventually causing medium leakage or even complete failure of the sealing structure, causing slurry and coal slurry leakage, and the seal needs to be replaced. The operation structure of inserting from top to bottom is relatively simple, but due to the harsh working environment, it is necessary to regularly check and replace vulnerable parts such as seals and valve stems, and the work of cleaning slurry residues and preventing particle accumulation also increases the maintenance workload and cost.

[0004] Therefore, a knife gate valve with less structural damage, long service life and reduced impact on the working environment is needed. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a slurry knife gate valve, comprising an upper valve body, a middle valve body, a lower valve body, a valve plate and a drive unit, and also comprising a composite guide unit. A medium channel is arranged in the middle of the middle valve body, the drive unit is connected to the valve plate, the drive unit is transmission-connected to the valve plate and drives it to reciprocate along the composite guide units at both ends, a wedge-shaped flow port and a material stopper are arranged on the valve plate, when the wedge-shaped flow port is connected with the medium channel, the connection of pipeline equipment is achieved, when the valve plate is placed in the position of the medium channel through the material stopper, the isolation of the medium channel is achieved, the wedge-shaped flow port is arranged above the material stopper, the wedge-shaped flow port is matched with the medium channel, when the knife gate valve is connected, the material stopper of the valve plate is located below the medium channel.

[0006] Preferably, a lower valve body is provided at the lower part of the middle valve body, a drainage groove is provided in the lower valve body, and the material blocking portion of the valve plate is received in the drainage groove.

[0007] Preferably, it also includes a self-cleaning sealing component, which is arranged at the medium channel of the middle valve body. The self-cleaning sealing component includes a pair of relatively arranged rubber valve seats, and the rubber valve seats are arranged to fit the inner wall of the medium channel.

[0008] Preferably, the composite guide unit includes guide grooves, with two guide grooves respectively arranged at the upper and lower ends of the middle valve body, and flexible self-lubricating guide strips are embedded in the guide grooves. The guide strips are respectively pressed against the upper valve body and the lower valve body, and the inner side surfaces of the guide strips are tightly attached to the valve plate to form a dynamic contact surface.

[0009] Preferably, the friction coefficient of the guide strip is ≤0.2, the elastic modulus is between 5 and 20 MPa, the cross-section is rectangular, the guide strip is distributed in a U shape in the guide groove, and the guide strip is distributed at the four corners of the middle valve body.

[0010] Preferably, the driving unit is configured to achieve sealing coverage of the medium channel by pulling the valve plate to move upward, and the driving unit is configured to achieve communication of the medium channel by pushing the valve plate to move downward.

[0011] Preferably, flushing holes are respectively provided on the four corners of the middle valve body, and the flushing holes are blocked with detachable plugs.

[0012] Preferably, a supporting steel ring is embedded in the rubber valve seat, and a plurality of process holes are arranged around the supporting steel ring.

[0013] Preferably, the inner ring of the rubber valve seat is further provided with an inner groove with an inner curvature radius of R3mm-R30mm, and the inner groove is in an arc shape.

[0014] Preferably, an inward convex lip is provided at the bottom of the rubber valve seat, and the rubber valve seats on the front and rear sides are arranged relatively to each other, so that when the knife gate valve is opened, the inner convex lips of the rubber valve seats on both sides press against each other to form a sealed state.

[0015] Preferably, a slag discharge chamber is further provided at the bottom of the lower valve body, the top of the slag discharge chamber is connected to the bottom of the drainage groove, and the slag discharge chamber is provided with a drainage port.

[0016] Preferably, the driving unit comprises a driving device and a valve stem, the driving device is arranged on the upper part of the upper valve body, the driving device drives the valve stem to move up and down, and a protective tube is sleeved on the valve stem.

[0017] Preferably, the driving device is one of a hand wheel, an electric actuator, a hydraulic actuator or a pneumatic actuator.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] According to the characteristics of ore slurry and mortar that block materials are easy to accumulate at the bottom of the pipeline due to fluidity, the operation mode of the knife gate valve disc is changed. The knife gate valve disc is changed from inserting from top to bottom to pulling from bottom to top. Block stones, coal slag and other materials accumulated at the bottom of the pipeline meet the valve disc pulled from bottom to top, and the materials are lifted up. Under the action of gravity and medium flow rate, the materials fall to both sides of the valve disc, making the valve disc easy to close, avoiding the valve disc from being stuck, and extending the service life of the valve;

[0020] A composite guide unit is provided at the upper and lower ends of the middle valve body, which includes two guide grooves with flexible self-lubricating guide strips embedded in the guide grooves. It undertakes the three core functions of controlling the movement accuracy of the valve plate, resisting interference and jamming, and reducing friction and wear.

[0021] The rubber valve seat has a built-in supporting steel ring to avoid radial deformation of the rubber valve seat, making it easier to seal. Holes are opened around the axial direction to facilitate the placement of supporting steel rings when making the rubber valve seat, and vulcanization and molding together with the rubber. It is also beneficial for the knife gate valve to deform the rubber valve seat in the axial direction when opening and closing the valve, making it easier for the valve plate to be inserted between the two rubber valve seats and easier to open and close the valve; an arc-shaped inner groove is set on the inner ring of the rubber valve seat to make the rubber valve seat more easily deformed axially; an inward convex lip is set at the bottom of the rubber valve seat. When the valve is open, the convex lips of the left and right rubber valve seats are pressed against each other, so that there is a bulge on the convex lip. When the valve is opened, the diameter here becomes smaller, the flow rate in the channel becomes higher, and it is not easy to accumulate stones and other materials, thereby reducing the risk of valve damage and increasing the service life of the valve.

[0022] A drainage hole is set at the bottom of the lower valve body, and the leaked ore, coal slag, etc. are drained to a suitable position through a hose to avoid pollution of the working environment; the middle valve body is provided with a flushing hole, which is connected to an external high-pressure water flow to flush out the ash and slag accumulated inside the valve, and drain the medium flow generated by the flushing to other positions to avoid polluting the working environment of the knife gate valve.

[0023] Inside the upper valve body, a retractable protective tube is provided on the valve stem to achieve full sealing. While protecting the valve stem, it prevents the medium in the valve from leaking to the outside and polluting the working environment.

[0024] The top of the knife gate valve can be replaced with a suitable drive mode such as handwheel drive, electric actuator drive, hydraulic actuator drive, pneumatic actuator drive, etc., with high versatility. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be discussed below. Obviously, the technical solutions described in conjunction with the drawings are only some embodiments of the present invention. For ordinary technicians in this field, other embodiments and their drawings can be obtained based on the embodiments shown in these drawings without paying creative work.

[0026] Figure 1 It is a schematic perspective view of a slurry knife gate valve of the present invention.

[0027] Figure 2 It is a schematic three-dimensional diagram of a slurry knife gate valve of the present invention, showing a state in which a drainage port is exposed.

[0028] Figure 3 The invention discloses a schematic cross-sectional structure diagram of a slurry knife gate valve.

[0029] Figure 4 The present invention is a schematic diagram of the state structure of a composite guide unit and a valve plate of a slurry knife gate valve without upper and lower valve bodies.

[0030] Figure 5 The present invention is a slurry knife gate valve Figure 4 A local enlarged schematic diagram of point A in the middle.

[0031] In the figure: 100-upper valve body, 200-middle valve body, 210-medium channel, 220-flushing hole, 300-lower valve body, 310-drainage groove, 320-slag discharge cavity, 330-drainage port, 400-valve plate, 410-wedge-shaped flow port, 420-material stopper, 510-rubber valve seat, 520-support steel ring, 530-process hole, 540-inner groove, 550-convex lip, 600-compound guide unit, 610-guide groove, 620-guide strip, 700-drive unit, 800-valve stem, 810-protective tube. DETAILED DESCRIPTION

[0032] The following will clearly and completely describe the technical solutions of various embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments described in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] An embodiment of the present invention provides a slurry knife gate valve, such as Figure 1-5As shown, it includes an upper valve body 100, a middle valve body 200, a lower valve body 300, a valve plate 400, a self-cleaning sealing assembly, a composite guide unit 600 and a drive unit 700. A medium channel 210 is provided in the middle of the middle valve body 200, and the drive unit 700 is connected to the valve plate 400. The drive unit 700 is in transmission connection with the valve plate 400 and drives it to reciprocate along the direction of the composite guide unit 600 at both ends. The valve plate 400 is provided with a wedge-shaped flow port 410 and a material stopper 420. When the wedge-shaped flow port 410 is connected to the medium channel 210, the equipment connection of the knife gate valve is realized.

[0034] When the valve plate 400 is placed at the position of the medium channel 210 through the material stopper 420, the medium channel 210 is isolated, and the wedge-shaped flow opening 410 is arranged above the material stopper 420. The wedge-shaped flow opening 410 is matched with the medium channel 210, and when the knife gate valve is connected, the material stopper 420 of the valve plate 400 is located below the medium channel 210.

[0035] The lower valve body 300 is fixedly disposed below the middle valve body 200 . A drainage groove 310 is disposed in the lower valve body 300 . The material blocking portion 420 of the valve plate 400 is received in the drainage groove 310 .

[0036] The self-cleaning sealing assembly includes a rubber valve seat 510, and the rubber valve seat 510 is arranged at the medium channel 210 of the middle valve body 200. The rubber valve seat 510 is arranged in contact with the inner wall of the medium channel 210.

[0037] The self-cleaning sealing assembly further includes a flushing hole 220 and a slag discharge chamber 320. The slag discharge chamber 320 is disposed at the bottom of the lower valve body 300. The top of the slag discharge chamber 320 is connected to the bottom of the drainage groove 310. The slag discharge chamber 320 is provided with a drainage port 330. The four corners of the middle valve body 200 are respectively provided with flushing holes 220, which are usually sealed with plugs.

[0038] When in use, the drainage port 330 is connected to an external pipeline to drain the leaked medium flow to other locations to avoid polluting the working environment of the knife gate valve. Further, by loosening the plug on the flushing hole 220 provided on the surface of the middle valve body 200 and connecting to an external high-pressure water flow, the ash accumulated inside the valve can be washed clean, and the medium flow generated by the flushing can be drained to other locations through the slag discharge cavity 320 to avoid polluting the working environment of the knife gate valve.

[0039] A supporting steel ring 520 is arranged inside the rubber valve seat 510, and a plurality of process holes 530 are arranged around the supporting steel ring 520. Furthermore, a matching rubber plug is plugged on the process hole 530 to prevent the medium from leaking out at the flange.

[0040] The inner ring of the rubber valve seat 510 is further provided with an inner groove 540 . The inner groove 540 is in an arc shape, and the inner curvature radius of the inner groove 540 is R3mm-R30mm.

[0041] An inward convex lip 550 is provided at the bottom of the rubber valve seat 510, and the rubber valve seats 510 at the front and rear sides are arranged relatively to each other, so that when the knife gate valve is opened, the inner convex lips 550 of the rubber valve seats 510 at both sides are pressed against each other to form a sealing state.

[0042] The composite guide unit 600 includes a guide groove 610, and two guide grooves 610 are respectively provided at the upper and lower ends of the middle valve body 200. A flexible self-lubricating guide strip 620 is provided in the guide groove 610, and the guide strip 620 is respectively pressed against the upper valve body 100 and the lower valve body 300, and the inner side of the guide strip 620 is pressed against the valve plate 400 to form a dynamic fit. The friction coefficient of the guide strip 620 is ≤0.2, and the elastic modulus is between 5 and 20 MPa. The cross section of the guide strip 620 is rectangular, and the guide strip 620 is constrained and clamped in the guide groove 610. The guide strip 620 is U-shaped and distributed at the four corners of the middle valve body 200. Further, when the valve plate 400 moves relative to the guide strip 620 during the opening and closing process, the composite guide unit 600 can stabilize the movement accuracy of the valve plate 400, resist interference, prevent jamming, and reduce friction and wear.

[0043] The driving unit 700 includes a driving device and a valve stem 800. The driving device is disposed on the upper portion of the upper valve body 100, and the driving device drives the valve stem 800 to move up and down.

[0044] The valve stem 800 is sleeved with a protective tube 810, which is a retractable bellows and made of rubber elastic material or laminated non-woven fabric material.

[0045] The selection of the driving device is a general technical means in this field and can be replaced by a suitable driving method such as hand wheel drive, electric actuator drive, hydraulic actuator drive, pneumatic actuator drive, etc.

[0046] The technical solution disclosed in this embodiment changes the operation mode of the knife gate valve according to the characteristic that block materials of slurry and mortar are easily accumulated at the bottom of the pipeline due to fluidity. When the knife gate valve needs to close the connected state of the medium channel 210, the action of inserting the valve plate 400 from top to bottom is adjusted to pulling the valve plate 400 upward under the medium channel 210. At this time, block stones, coal slag and other materials accumulated at the bottom of the pipeline meet the valve plate 400 pulled up from bottom to top, and the materials are lifted up. Under the action of gravity and medium flow rate, the materials fall to both sides of the valve plate 400, so that the valve plate 400 is easy to close, thus avoiding the valve plate 400 from being stuck and extending the service life of the valve.

[0047] The rubber valve seat 510 is provided with a built-in supporting steel ring 520 to prevent radial deformation of the rubber valve seat 510, so that the rubber valve seat 510 is easier to seal. Holes are opened around the axial direction to facilitate the placement of the supporting steel ring 520 when making the rubber valve seat 510 and vulcanization molding together with the rubber. It is also convenient for the valve plate 400 to deform the rubber valve seat 510 in the axial direction when opening and closing the valve, so that the valve plate 400 is easier to insert between the two rubber valve seats 510, and it is easy to open and close the valve; the inner ring of the rubber valve seat 510 is provided with an arc-shaped inner groove 540 to make the rubber valve seat 510 easier to deform axially; the bottom of the rubber valve seat 510 is provided with an inward convex lip 550. When the valve is opened, the convex lips 550 of the left and right rubber valve seats 510 are pressed against each other, so that there is a bulge at the convex lip 550. When the valve is opened, the diameter here becomes smaller, the flow rate of the channel becomes higher, and it is not easy to accumulate stones and other materials, thereby reducing the risk of valve damage and increasing the service life of the valve. The middle valve body 200 is provided with a flushing hole 220, which is connected to an external high-pressure water flow. Normally, the external high-pressure water flow is not less than 1.5 times the pressure of the pipeline medium.

[0048] A drainage hole is arranged at the bottom of the lower valve body 300, and the leaked ore sand, coal slag, etc. are drained to a suitable position through a hose to avoid pollution of the working environment.

[0049] Inside the upper valve body 100 , a retractable protective tube 810 is provided on the valve stem 800 to seal the position of the valve stem 800 and protect the valve stem 800 .

[0050] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive from any point of view. The scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0051] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A slurry knife gate valve, comprising an upper valve body (100), a middle valve body (200), a lower valve body (300), a valve plate (400) and a drive unit (700), characterized in that: The invention also comprises a composite guide unit (600), a medium channel (210) is arranged in the middle of the middle valve body (200), the drive unit (700) is connected to the valve plate (400), the drive unit (700) is transmission-connected to the valve plate (400) and drives the composite guide unit (600) to reciprocate along the two ends thereof, the valve plate (400) is provided with a wedge-shaped flow opening (410) and a material stopper (420), the wedge-shaped flow opening (410) and the medium channel (210) are connected to each other. When connected, the connection of the pipeline equipment is achieved. When the valve plate (400) is placed at the position of the medium channel (210) through the material stopper (420), the medium channel (210) is isolated. The wedge-shaped flow opening (410) is arranged above the material stopper (420). The wedge-shaped flow opening (410) is matched with the medium channel (210). When the knife gate valve is connected, the material stopper (420) of the valve plate (400) is located below the medium channel (210).

2. The slurry knife gate valve according to claim 1, characterized in that: A lower valve body (300) is provided at the lower part of the middle valve body (200), a drainage groove (310) is provided in the lower valve body (300), and the material blocking portion (420) of the valve plate (400) is received in the drainage groove (310).

3. The slurry knife gate valve according to claim 1, characterized in that: It also includes a self-cleaning sealing component, which is arranged at the medium channel (210) of the middle valve body (200). The self-cleaning sealing component includes a pair of rubber valve seats (510) arranged opposite to each other, and the rubber valve seats (510) are arranged to fit the inner wall of the medium channel (210).

4. The slurry knife gate valve according to claim 1, characterized in that: The composite guide unit (600) includes a guide groove (610), and two guide grooves (610) are respectively provided at the upper and lower ends of the middle valve body (200). Flexible self-lubricating guide strips (620) are embedded in the guide grooves (610). The guide strips (620) are respectively pressed against the upper valve body (100) and the lower valve body (300), and the inner side surface of the guide strip (620) is pressed against the valve plate (400) to form a dynamic contact surface.

5. The slurry knife gate valve according to claim 4, characterized in that: The guide strip (620) has a friction coefficient of ≤0.2, an elastic modulus between 5 and 20 MPa, a rectangular cross-section, and is distributed in a U-shape within the guide groove (610). The guide strip (620) is distributed at the four corners of the middle valve body (200).

6. The slurry knife gate valve according to claim 1, characterized in that: The driving unit (700) is configured to achieve sealing coverage of the medium channel (210) by pulling the valve plate (400) to move upward, and the driving unit (700) is configured to achieve communication of the medium channel (210) by pushing the valve plate (400) to move downward.

7. The slurry knife gate valve according to claim 1, characterized in that: Flushing holes (220) are respectively provided at the four corners of the middle valve body (200), and the flushing holes (220) are blocked with detachable plugs.

8. The slurry knife gate valve according to claim 3, characterized in that: The rubber valve seat (510) is embedded with a supporting steel ring (520), and a plurality of process holes (530) are arranged in the circumference of the supporting steel ring (520).

9. The slurry knife gate valve according to claim 8, characterized in that: The inner ring of the rubber valve seat (510) is further provided with an inner groove (540) having an inner curvature radius of R3 mm to R30 mm, and the inner groove (540) is in an arc shape.

10. The slurry knife gate valve according to claim 8, characterized in that: An inward convex lip (550) is arranged at the bottom of the rubber valve seat (510), and the rubber valve seats (510) on the front and rear sides are arranged relatively to each other, so that when the knife gate valve is in the open state, the convex lips (550) on the inner sides of the rubber valve seats (510) on both sides are pressed against each other to form a sealed state.

11. The slurry knife gate valve according to claim 2, characterized in that: A slag discharge chamber (320) is also provided at the bottom of the lower valve body (300); the top of the slag discharge chamber (320) is connected to the bottom of the drainage groove (310); and the slag discharge chamber (320) is provided with a drainage port (330).

12. The slurry knife gate valve according to claim 1, characterized in that: The driving unit (700) comprises a driving device and a valve stem (800); the driving device is arranged on the upper part of the upper valve body (100); the driving device drives the valve stem (800) to move up and down; and a protective tube (810) is sleeved on the valve stem (800).

13. The slurry knife gate valve according to claim 12, characterized in that: The driving device is one of a hand wheel, an electric actuator, a hydraulic actuator or a pneumatic actuator.

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