Knife gate valve and method of assembly

Abstract

A knife type gate valve and assembling method, including upper discharge port flange and lower discharge port flange, a plurality of adjusting bolts are arranged on the lower discharge port flange, one end of the adjusting bolt passes through the upper surface of the lower discharge port flange and is matched with the lower part of the upper discharge port flange, the gate movable layer formed between the lower surface of the upper discharge port flange and the upper surface of the lower discharge port flange is provided with a gate piece, the lower surface of the upper discharge port flange is provided with an annular groove, the discharge port sealing assembly is matched and installed in the annular groove, the lower part of the discharge port sealing assembly is matched with the upper surface of the gate piece, the gate piece moves relative to the discharge port sealing assembly to realize the opening and closing of the gate valve, the side sealing gasket is arranged between the upper discharge port flange and the lower discharge port flange on both sides of the moving direction of the gate piece, the rear end of the gate piece in the moving direction passes through the rear sealing plate assembly and is connected with the output end of the air cylinder. The cooperation degree between the sealing element of the gate valve and the gate piece can be adjusted according to the actual situation, the normal opening and closing of the gate valve is ensured while good sealing is realized.

Description

Technical Field

[0001] This invention relates to the field of valve technology, and in particular to a knife gate valve and its assembly method. Background Technology

[0002] Knife gate valves are valves in which a cylinder drives a gate to move relative to the sealing surface, which can open or close the fluid passage. They are the main components for flow control of powder, granular materials and small particles, and are widely used in metallurgy, mining and chemical industries.

[0003] Currently available knife gate valves typically employ a soft seal method combining PTFE ring compression and PTFE packing at the shaft end, or a metal-to-metal hard seal method. However, when dealing with fine powders, the powder can become trapped between the seal and the gate as the valve opens and closes. High-hardness powders, with frequent opening and closing, can cause wear on the seal and gate, resulting in poor sealing, frequent maintenance, and in severe cases, significant leakage or blockage, preventing the valve from closing. Summary of the Invention

[0004] In response to the shortcomings of the existing production technology, the applicant provides a knife gate valve and its assembly method, which can adjust the fit between the gate valve sealing element and the gate element according to the actual situation, so as to ensure the normal opening and closing of the gate valve while achieving good sealing.

[0005] The technical solution adopted in this invention is as follows:

[0006] A knife gate valve includes an upper discharge port flange with a first discharge hole in the middle and a lower discharge port flange with a second discharge hole in the middle. The first discharge hole corresponds to the second discharge hole. Multiple adjusting bolts are provided on the lower discharge port flanges on both sides of the second discharge hole. One end of the adjusting bolt passes through the upper surface of the lower discharge port flange and engages with the lower part of the upper discharge port flange. A gate movable layer is formed between the lower surface of the upper discharge port flange and the upper surface of the lower discharge port flange. Multiple locking bolt assemblies are also provided on the lower discharge port flanges on both sides of the second discharge hole. The locking bolt assemblies engage with both the upper discharge port flange and the lower discharge port flange. The inner wall of the second discharge hole has a conical structure, and the larger opening of the second discharge hole faces upward.

[0007] A gate component corresponding to the first discharge hole is provided in the movable layer of the gate. An annular groove concentric with the first discharge hole is provided on the lower surface of the upper discharge port flange. A discharge port sealing component is installed in the annular groove. The lower part of the discharge port sealing component is fitted with the upper surface of the gate component. The gate component moves relative to the discharge port sealing component to realize the opening and closing of the gate valve. A guide structure is symmetrically provided on the upper surface of the lower discharge port flange to fit the side of the gate component in the direction of movement. A side sealing gasket is provided between the upper and lower discharge port flanges on both sides of the gate component in the direction of movement. A front sealing plate component is installed on the side of the upper and lower discharge port flanges on the front side of the gate component in the direction of movement. A rear sealing plate component is installed on the side of the upper and lower discharge port flanges on the rear side of the gate component in the direction of movement. The rear end of the gate component in the direction of movement passes through the rear sealing plate component and connects to the output end of the cylinder.

[0008] As a further improvement to the above technical solution:

[0009] The structure of the discharge port sealing assembly is as follows: it includes a first sealing ring that mates with the inner wall of the annular groove; a second sealing ring is installed on the lower outer circumferential surface of the first sealing ring; an O-ring is provided on the upper surface of the second sealing ring; the upper part of the O-ring mates with the bottom of the annular groove; the inner ring of the O-ring mates with the upper outer circumferential surface of the first sealing ring; it also includes a sealing pressure ring; the outer wall of the annular groove and the second sealing ring mate with the sealing pressure ring; and the lower parts of the first sealing ring and the lower parts of the second sealing ring mate with the upper surface of the gate component.

[0010] The structure of the first sealing ring is as follows: it includes a first annular body, a first annular protrusion with an annular structure is provided on the outer side of the upper end of the first annular body, the inner wall surface of the first annular body is engaged with the inner side wall of the annular groove, the upper end surface of the first annular body is engaged with the bottom of the annular groove, the outer peripheral surface of the first protrusion is engaged with the inner ring of the O-ring, the lower surface of the first protrusion is engaged with the upper part of the second sealing ring, and the lower end of the first annular body is engaged with the upper surface of the gate component.

[0011] The structure of the second sealing ring is as follows: it includes a second annular body, a second annular protrusion with an annular structure is provided on the outer side of the upper end of the second annular body, the lower end of the second annular body is a downwardly protruding arc-shaped end face, the second protrusion cooperates with the sealing pressure ring, the inner wall surface of the second annular body cooperates with the lower outer peripheral surface of the first sealing ring, the upper end face of the second annular body cooperates with the lower part of the O-ring, and the arc-shaped end face cooperates with the upper surface of the gate component.

[0012] The sealing ring has the following structure: it includes a ring body, the lower surface of the ring body is provided with a plurality of mounting holes, the mounting holes are through holes, the lower inner wall of the ring body is provided with a ring-shaped pressure block, the pressure block cooperates with the second sealing ring, and the outer peripheral surface of the ring body cooperates with the outer groove wall of the annular groove.

[0013] Multiple fasteners are installed through the mounting hole. One end of the fastener engages with the bottom of the annular groove, and the other end engages with the pressure ring body.

[0014] The gate component is a plate-shaped structure. An inclined surface is provided on the upper surface of the front end of the gate component in the moving direction. The inclined surface is inclined downward in the front end of the gate component in the moving direction, and the angle between the inclined surface and the horizontal plane is 5°-20°.

[0015] The guide structure comprises a rectangular block-shaped guide body, a support block located on one side of the guide body, the upper surface of the support block and the side of the guide body cooperating with the gate plate, the lower surface of the guide body cooperating with the upper surface of the lower discharge port flange, the lower surface of the side sealing gasket cooperating with the upper surface of the guide body, and the upper surface of the side sealing gasket cooperating with the lower surface of the upper discharge port flange.

[0016] The structure of the front sealing plate assembly is as follows: it includes a front sealing plate, the upper end of which is connected to the side of the upper discharge port flange, the lower end of which is connected to the side of the lower discharge port flange, a front sealing gasket is provided between the upper discharge port flange and the lower discharge port flange and the front sealing plate, and the end of the side sealing gasket and the end of the guide structure cooperate with the front sealing gasket.

[0017] The structure of the rear sealing plate assembly is as follows: it includes a rear sealing plate, the upper end of which is connected to the side of the upper discharge port flange, the lower end of which is connected to the side of the lower discharge port flange, a rear sealing gasket is provided between the upper discharge port flange and the lower discharge port flange and the rear sealing plate, the end of the side sealing gasket and the end of the guide structure cooperate with the rear sealing gasket, the rear sealing plate is provided with a first gate hole that cooperates with the gate plate, and the rear sealing gasket is provided with a second gate hole that seals with the gate plate.

[0018] An assembly method for a knife gate valve includes the following steps:

[0019] Step 1: Install the discharge port sealing assembly in the upper discharge port flange:

[0020] A first sealing ring, an O-ring, a second sealing ring, and a sealing pressure ring are sequentially fitted from the inside to the outside of the annular groove wall of the upper discharge port flange. The sealing pressure ring restricts the first sealing ring, the O-ring, and the second sealing ring that are in contact with each other in the annular groove. The upper part of the O-ring is in contact with the bottom of the annular groove, the lower part of the O-ring is in contact with the upper surface of the second sealing ring, and the inner ring of the O-ring is in contact with the upper outer circumferential surface of the first sealing ring. At this time, the O-ring is in its initial state, and the lower surface of the second sealing ring is lower than the lower surface of the first sealing ring.

[0021] Step 2: Preliminary assembly of the lower discharge port flange and related components:

[0022] A guide structure and a side sealing gasket are symmetrically installed on the upper surface of the lower discharge port flange, and the gate component is fitted with the guide structure.

[0023] Step 3: Pre-assemble the upper and lower discharge port flanges:

[0024] Pre-install the locking bolt assembly to initially connect the lower discharge port flange and the upper discharge port flange and allow them to move relative to each other. At the same time, pre-install the front sealing plate assembly on the side of the upper discharge port flange and the side of the lower discharge port flange in the direction of movement of the gate component, as well as the rear sealing plate assembly at the rear end of the direction of movement of the gate component. Then, connect the rear end of the gate component in the direction of movement of the gate component through the rear sealing plate assembly to the output end of the cylinder.

[0025] Step 4: Adjust the sealing state of the outlet sealing assembly:

[0026] The upper end of the adjusting bolt is passed through the upper surface of the lower outlet flange and mates with the lower part of the upper outlet flange, so that the upper end of the adjusting bolt extends a certain length beyond the upper surface of the upper outlet flange and lifts the upper outlet flange, so that a certain distance is maintained between the upper surface of the lower outlet flange and the upper outlet flange, while the side sealing gasket maintains an elastic deformation state.

[0027] The gate component is moved back and forth to test the fit between the gate component and the outlet sealing assembly. When the gate valve is closed, the O-ring is under appropriate compression deformation, and the lower surfaces of the first and second sealing rings are in contact with the upper surface of the gate component at the same time, ensuring smooth movement of the gate component and good sealing.

[0028] Step 5: Complete valve assembly:

[0029] When the fit between the outlet sealing assembly and the gate assembly meets the requirements, the locking bolt assembly is installed to lock the upper outlet flange and the lower outlet flange together. At the same time, a nut is installed on the adjusting bolt on the outer side of the lower outlet flange so that the upper surface of the nut fits with the lower part of the lower outlet flange. Then, the front sealing plate assembly and the rear sealing plate assembly are connected to the sides of the upper outlet flange and the lower outlet flange.

[0030] The beneficial effects of this invention are as follows:

[0031] This invention features a compact and reasonable structure, and is easy to operate. The structure, which uses adjusting bolts to cooperate with the lower and upper discharge port flanges respectively, facilitates the adjustment of the fit between the discharge port sealing assembly and the gate valve. It allows for the debugging or adjustment of the gate valve's opening and closing status for different working conditions, ensuring a good seal between the discharge port sealing assembly and the gate valve while ensuring smooth opening and closing of the gate valve.

[0032] The present invention also includes the following advantages:

[0033] (1) The lower part of the first sealing ring and the lower part of the second sealing ring cooperate with the upper surface of the gate component to jointly play a sealing role, which greatly improves the sealing performance of the valve. At the same time, the first sealing ring can throttle most of the powder when the gate valve is closed, thereby reducing the failure caused by the sealing component jamming.

[0034] (2) The O-ring is located between the bottom of the annular groove and the upper surface of the second sealing ring. When the upper surface of the gate valve contacts the lower part of the second sealing ring, the O-ring is compressed and deformed, making the lower part of the second sealing ring fit more tightly with the upper surface of the gate valve, further ensuring the sealing performance of the gate valve.

[0035] (3) The lower part of the second sealing ring is an arc-shaped end face. The arc-shaped end face is in linear contact with the gate component, which reduces friction and ensures a good sealing effect between it and the gate component.

[0036] (4) The inclined surface at the front end of the gate component can better transition when the gate component moves forward in the moving direction and comes into contact with the outlet sealing component, so as to realize the smooth closing of the gate valve and extend the service life of the outlet sealing component. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the structure of the present invention.

[0038] Figure 2 This is a schematic diagram of the structure of the present invention (from another perspective).

[0039] Figure 3 This is an exploded view of the present invention.

[0040] Figure 4 for Figure 3 Enlarged view of a portion of point A in the middle.

[0041] Figure 5 This is an exploded view (another perspective) of the present invention.

[0042] Figure 6 This is a cross-sectional view (front view) of the present invention.

[0043] Figure 7 for Figure 6 Enlarged view of section B in the middle.

[0044] Figure 8 This is a cross-sectional view (side view) of the present invention.

[0045] Figure 9 for Figure 8 Enlarged view of a section at point C.

[0046] Figure 10 This is a schematic diagram showing the state of the outlet sealing assembly when the gate valve of the present invention is opened.

[0047] Figure 11 This is a schematic diagram showing the state of the outlet sealing assembly when the gate valve of the present invention is closed.

[0048] Figure 12 This is a schematic diagram of the upper discharge port flange of the present invention.

[0049] Figure 13 This is a schematic diagram of the structure of the first sealing ring of the present invention.

[0050] Figure 14 This is a schematic diagram of the structure of the second sealing ring of the present invention.

[0051] Figure 15 This is a schematic diagram of the sealing ring structure of the present invention.

[0052] Figure 16 This is a schematic diagram of the sealing ring structure of the present invention (from another perspective).

[0053] Figure 17 This is a schematic diagram of the structure of the gate component of the present invention.

[0054] Figure 18 for Figure 17 Enlarged view of a section at point D.

[0055] Figure 19 This is a schematic diagram of the guiding structure of the present invention.

[0056] The components include: 1. Upper discharge flange; 101. First discharge hole; 102. Annular groove; 2. Lower discharge flange; 201. Second discharge hole; 3. Guide structure; 31. Side sealing gasket; 301. Guide body; 302. Support block;

[0057] 4. Locking bolt assembly; 5. Gate plate component; 501. Inclined surface; 6. Cylinder;

[0058] 7. Discharge port sealing assembly; 71. First sealing ring; 7101. First annular body; 7102. First boss; 72. O-ring; 73. Second sealing ring; 7301. Second annular body; 7302. Second boss; 7303. Arc-shaped end face; 74. Sealing pressure ring; 7401. Pressure ring body; 7402. Pressure block; 7403. Mounting hole;

[0059] 8. Front sealing plate assembly; 81. Front sealing plate component; 82. Front sealing gasket; 9. Rear sealing plate assembly; 91. Rear sealing plate component; 9101. First gate hole; 92. Rear sealing gasket; 9201. Second gate hole;

[0060] 10. Adjusting bolt; 1001. Nut; 11. Adapter; 12. Limit bolt; 13. Anti-collision ring; 14. Mounting plate; 15. Side connecting plate. Detailed Implementation

[0061] The specific embodiments of the present invention will now be described with reference to the accompanying drawings.

[0062] like Figures 1-9 , Figure 12 As shown, the knife gate valve of this embodiment includes an upper discharge flange 1 with a first discharge hole 101 in the middle and a lower discharge flange 2 with a second discharge hole 201 in the middle. The first discharge hole 101 corresponds to the second discharge hole 201. Multiple adjusting bolts 10 are provided on the lower discharge flanges 2 on both sides of the second discharge hole 201. One end of the adjusting bolt 10 passes through the upper surface of the lower discharge flange 2 and cooperates with the lower part of the upper discharge flange 1. A gate moving layer is formed between the lower surface of the upper discharge flange 1 and the upper surface of the lower discharge flange 2. Multiple locking bolt assemblies 4 are also provided on the lower discharge flanges 2 on both sides of the second discharge hole 201. The locking bolt assemblies 4 cooperate with both the upper discharge flange 1 and the lower discharge flange 2. The inner wall of the second discharge hole 201 has a conical structure, and the larger opening of the second discharge hole 201 faces upward.

[0063] A gate component 5 corresponding to the first discharge hole 101 is provided in the movable layer of the gate. An annular groove 102 concentric with the first discharge hole 101 is provided on the lower surface of the upper discharge flange 1. A discharge port sealing component 7 is installed in the annular groove 102. The lower part of the discharge port sealing component 7 is in contact with the upper surface of the gate component 5. The gate component 5 moves relative to the discharge port sealing component 7 to realize the opening and closing of the gate valve. A guide structure 3 is symmetrically provided on the upper surface of the lower discharge flange 2 to cooperate with the side of the gate component 5 in the direction of movement. A side sealing gasket 31 is provided between the upper discharge flange 1 and the lower discharge flange 2 on both sides of the gate component 5 in the direction of movement. A front sealing plate component 8 is installed on the side of the upper discharge flange 1 and the side of the lower discharge flange 2 on the front side of the gate component 5 in the direction of movement. A rear sealing plate component 9 is installed on the side of the upper discharge flange 1 and the side of the lower discharge flange 2 on the rear side of the gate component 5 in the direction of movement. The rear end of the gate component 5 in the direction of movement passes through the rear sealing plate component 9 and is connected to the output end of the cylinder 6.

[0064] The upper discharge port flange 1 is connected to the discharge port of the powder equipment. The inner wall of the second discharge hole 201 is conical, with the larger opening facing upwards and the smaller opening facing downwards. The second discharge hole 201 can be set with different slopes according to the sliding properties of different materials to ensure smooth material flow. The movement of the output end of the cylinder 6 drives the gate component 5 to move in the gate moving layer. At the same time, during the movement of the gate component 5, it cooperates with the discharge port sealing assembly 7 to realize the opening and closing of the gate valve. The side sealing gasket 31 is made of foam material or other compressible sealing components.

[0065] like Figures 8-9 As shown, the upper end of the adjusting bolt 10 passes through the upper surface of the lower discharge port flange 2 and mates with the lower part of the upper discharge port flange 1. The lower part of the adjusting bolt 10 is threadedly connected to the lower discharge port flange 2. The upper end of the adjusting bolt 10 extends a certain length beyond the upper surface of the upper discharge port flange 1 and lifts the upper discharge port flange 1, maintaining a certain distance between the upper surface of the lower discharge port flange 2 and the upper discharge port flange 1. This distance not only allows the side sealing gasket 31 to maintain its elastic deformation state and perform the sealing function of the movable layers of the gate plate on both sides of the gate plate 5 in the direction of movement, but also ensures that the discharge port sealing assembly 7 and the upper surface of the gate plate 5 are in a suitable fit, so that the gate plate 5 moves smoothly and has a good seal. After the adjusting bolt 10 is adjusted, the locking bolt assembly 4 is installed to lock the upper discharge port flange 1 and the lower discharge port flange 2 together. A nut 1001 is installed on the adjusting bolt 10 located on the outer side of the lower surface of the lower discharge port flange 2. After the installation position of the adjusting bolt 10 is determined, the upper surface of the nut 1001 is engaged with the lower part of the lower discharge port flange 2 to prevent the adjusting bolt 10 from loosening.

[0066] The structure of the adjusting bolts 10, which respectively mate with the lower discharge port flange 2 and the upper discharge port flange 1, facilitates the adjustment of the fit between the discharge port sealing assembly 7 and the gate valve 5. This allows for the debugging or adjustment of the gate valve's opening and closing status under different operating conditions, ensuring a good seal between the discharge port sealing assembly 7 and the gate valve 5 while ensuring smooth opening and closing of the gate valve. When the powder particles are fine, the discharge port sealing assembly 7 and the gate valve 5 need to fit even more tightly when the gate valve is closed.

[0067] The cylinder 6 is fixedly mounted relative to the lower discharge port flange 2 and the upper discharge port flange 1. It can be fixedly connected to the lower discharge port flange 2 and the upper discharge port flange 1 via a connecting seat. For example, the mounting part of the cylinder 6 can be fixedly connected to the mounting plate 14, and then the two sides of the mounting plate 14 can be connected to the two sides of the lower discharge port flange 2 via side connecting plates 15. The output end of the cylinder 6 is connected to the rear end of the gate component 5 in the direction of movement via an adapter 11. At the same time, limit bolts 12 are symmetrically arranged on the adapter 11 about the output end of the cylinder 6. The limit bolts 12 are parallel to the direction of movement of the output end of the cylinder 6. The end of the limit bolt 12 is equipped with an anti-collision ring 13 corresponding to the mounting plate 14. The combination structure of the limit bolt 12 and the anti-collision ring 13 serves to limit the movement of the gate component 5 to prevent excessive displacement.

[0068] like Figures 3-11 As shown, the structure of the outlet sealing assembly 7 is as follows: it includes a first sealing ring 71 that mates with the inner wall of the annular groove 102; a second sealing ring 73 is installed on the lower outer circumferential surface of the first sealing ring 71; an annular O-ring 72 is provided on the upper surface of the second sealing ring 73; the upper part of the O-ring 72 mates with the bottom of the annular groove 102; the inner ring of the O-ring 72 mates with the upper outer circumferential surface of the first sealing ring 71; and a sealing pressure ring 74 is also included. The outer wall of the annular groove 102 and the second sealing ring 73 mate with the sealing pressure ring 74. The lower part of the first sealing ring 71 and the lower part of the second sealing ring 73 mate with the upper surface of the gate component 5.

[0069] The lower part of the first sealing ring 71 and the lower part of the second sealing ring 73 cooperate with the upper surface of the gate component 5 to jointly perform a sealing function, greatly improving the sealing performance of the valve. At the same time, the first sealing ring 71 can throttle most of the powder when the gate valve is closed, thereby reducing the failure caused by the sealing component jamming.

[0070] The inner ring of the O-ring 72 engages with the upper outer circumferential surface of the first sealing ring 71 to clamp the first sealing ring 71 against the inner wall of the annular groove 102. At the same time, the O-ring 72 is located between the bottom of the annular groove 102 and the upper surface of the second sealing ring 73. When the upper surface of the gate valve 5 contacts the lower part of the second sealing ring 73, the O-ring 72 is compressed and deformed, making the lower part of the second sealing ring 73 fit more tightly with the upper surface of the gate valve 5, further ensuring the sealing performance of the gate valve.

[0071] When there is jamming or wear at the lower part of the second sealing ring 73, the elastic deformation of the O-ring 72 can ensure that the lower part of the second sealing ring 73 is sealed to the upper surface of the gate valve 5. At the same time, by changing the length of the upper part of the adjusting bolt 10 extending out of the upper surface of the upper discharge port flange 1, the amount of compression deformation of the O-ring 72 when the gate valve is closed can be changed. The fit between the sealing pressure ring 74 and the outer groove wall of the annular groove 102 and the second sealing ring 73 ensures that the second sealing ring 73 will not fall out of the annular groove 102.

[0072] like Figures 3-11 , Figure 13 As shown, the structure of the first sealing ring 71 is as follows: it includes a first annular body 7101, a first boss 7102 with an annular structure is provided on the outer side of the upper end of the first annular body 7101, the inner wall surface of the first annular body 7101 is engaged with the inner wall of the annular groove 102, the upper end surface of the first annular body 7101 is engaged with the bottom of the annular groove 102, the outer peripheral surface of the first boss 7102 is engaged with the inner ring of the O-ring 72, the lower surface of the first boss 7102 is engaged with the upper part of the second sealing ring 73, and the lower end of the first annular body 7101 is engaged with the upper surface of the gate plate 5.

[0073] like Figures 3-11 , Figure 14 As shown, the structure of the second sealing ring 73 is as follows: it includes a second annular body 7301, a second annular boss 7302 with an annular structure is provided on the outer side of the upper end of the second annular body 7301, the lower end of the second annular body 7301 is a downwardly protruding arc-shaped end face 7303, the second boss 7302 cooperates with the sealing pressure ring 74, the inner wall surface of the second annular body 7301 cooperates with the lower outer peripheral surface of the first sealing ring 71, the upper end face of the second annular body 7301 cooperates with the lower part of the O-ring 72, and the arc-shaped end face 7303 cooperates with the upper surface of the gate plate 5.

[0074] like Figures 3-11 , Figure 15 , Figure 16 As shown, the structure of the sealing ring 74 is as follows: it includes a ring body 7401, the lower surface of the ring body 7401 is provided with a plurality of mounting holes 7403, the mounting holes 7403 are through holes, the lower inner wall surface of the ring body 7401 is provided with a ring-shaped pressing block 7402, the pressing block 7402 cooperates with the second sealing ring 73, and the outer peripheral surface of the ring body 7401 cooperates with the outer groove wall of the annular groove 102;

[0075] Multiple fasteners are installed through the mounting hole 7403. One end of the fastener engages with the bottom of the annular groove 102, and the other end of the fastener engages with the pressure ring body 7401.

[0076] In the structure of the specific components of the discharge port sealing assembly 7 above, namely the first sealing ring 71, the O-ring 72, the second sealing ring 73, and the sealing pressure ring 74, the upper surface of the pressure block 7402 of the sealing pressure ring 74 cooperates with the second boss 7302 of the second sealing ring 73 to prevent the second sealing ring 73 from falling off. The inner wall surface of the second annular body 7301 of the second sealing ring 73 cooperates with the lower outer circumferential surface of the first sealing ring 71. At the same time, the structure of the first boss 7102 of the first sealing ring 71 can also further prevent the first sealing ring 71 from falling off. The O-ring 72 is set to make full use of the elastic performance of the O-ring and is a standard accessory for easy replacement and maintenance.

[0077] When the gate valve is open, the O-ring 72 is in a free state, and at this time the lower part of the first sealing ring 71 is slightly higher than the lower part of the second sealing ring 73. When the gate valve is closed, the lower parts of the first sealing ring 71 and the lower parts of the second sealing ring 73 simultaneously contact and seal with the gate component 5. The lower part of the second sealing ring 73 is an arc-shaped end face 7303, which makes linear contact with the gate component 5, reducing friction while ensuring a good sealing effect between it and the gate component 5.

[0078] like Figure 17 , Figure 18 As shown, the gate component 5 is a plate-shaped structure. An inclined surface 501 is provided on the upper surface of the front end of the gate component 5 in the moving direction. The inclined surface 501 is inclined downward in the front end of the gate component 5 in the moving direction, and the angle between the inclined surface 501 and the horizontal plane is 5°-20°.

[0079] The gate component 5 is made of wear-resistant metal and has a wear-resistant layer sprayed or electroplated on its surface. The inclined surface 501 can better transition when the gate component 5 moves forward in the moving direction and contacts the discharge port sealing component 7, so as to realize the smooth closing of the gate valve and extend the service life of the discharge port sealing component 7.

[0080] like Figures 3-9 , Figure 19 As shown, the structure of the guide structure 3 is as follows: it includes a guide body 301 with a rectangular block structure, a support block 302 is provided on the lower side of one side of the guide body 301, the upper surface of the support block 302 and the side of the guide body 301 cooperate with the gate plate 5, the lower surface of the guide body 301 cooperates with the upper surface of the lower discharge port flange 2, the lower surface of the side sealing gasket 31 cooperates with the upper surface of the guide body 301, and the upper surface of the side sealing gasket 31 cooperates with the lower surface of the upper discharge port flange 1.

[0081] The support block 302 on the guide structure 3 plays the role of supporting the lower surface of the gate plate 5, ensuring that the relative height position of the gate plate 5 and the lower discharge flange 2 is not inconvenient. At the same time, the upper surface of the support block 302 and the side of the guide body 301 cooperate with the gate plate 5 to play a guiding role.

[0082] The side sealing gasket 31 is located above the guide structure 3. The adjusting bolt 10 and the locking bolt assembly 4 both pass through the guide structure 3 and the side sealing gasket 31 and cooperate with the upper discharge port flange 1 to fix the side sealing gasket 31 and the guide structure 3.

[0083] like Figures 3-11As shown, the structure of the front sealing plate assembly 8 is as follows: it includes a front sealing plate 81, the upper end of the front sealing plate 81 is connected to the side of the upper discharge port flange 1, the lower end of the front sealing plate 81 is connected to the side of the lower discharge port flange 2, a front sealing gasket 82 is provided between the upper discharge port flange 1 and the lower discharge port flange 2 and the front sealing plate 81, and the ends of the side sealing gasket 31 and the guide structure 3 cooperate with the front sealing gasket 82.

[0084] The structure of the rear sealing plate assembly 9 is as follows: it includes a rear sealing plate 91, the upper end of which is connected to the side of the upper discharge port flange 1, and the lower end of which is connected to the side of the lower discharge port flange 2. A rear sealing gasket 92 is provided between the upper discharge port flange 1 and the lower discharge port flange 2 and the rear sealing plate 91. The ends of the side sealing gasket 31 and the guide structure 3 cooperate with the rear sealing gasket 92. The rear sealing plate 91 is provided with a first gate hole 9101 that cooperates with the gate plate 5, and the rear sealing gasket 92 is provided with a second gate hole 9201 that seals with the gate plate 5.

[0085] The cooperation between the rear sealing plate assembly 9 and the gate component 5, as well as the structure of the front sealing plate assembly 8, the cooperation between the rear sealing plate assembly 9 and the side sealing gasket 31, and the guide structure 3, ensure that the surrounding area of ​​the gate's active layer is sealed.

[0086] The assembly method of the knife gate valve in this embodiment includes the following steps:

[0087] Step 1: Install the discharge port sealing assembly 7 in the upper discharge port flange 1:

[0088] A first sealing ring 71, an O-ring 72, a second sealing ring 73, and a sealing pressure ring 74 are sequentially fitted from the inside to the outside of the annular groove 102 of the upper discharge port flange 1. The sealing pressure ring 74 restricts the first sealing ring 71, the O-ring 72, and the second sealing ring 73 that cooperate with each other in the annular groove 102. The upper part of the O-ring 72 cooperates with the bottom of the annular groove 102, the lower part of the O-ring 72 cooperates with the upper surface of the second sealing ring 73, and the inner ring of the O-ring 72 cooperates with the upper outer circumferential surface of the first sealing ring 71. At this time, the O-ring 72 is in the initial state, and the lower surface of the second sealing ring 73 is lower than the lower surface of the first sealing ring 71.

[0089] Step 2: Preliminary assembly of relevant components for the lower discharge port flange 2:

[0090] The guide structure 3 and the side sealing gasket 31 are symmetrically installed on the upper surface of the lower discharge port flange 2, and the gate piece 5 is fitted with the guide structure 3.

[0091] Step 3: Pre-assemble the upper discharge port flange 1 and the lower discharge port flange 2:

[0092] Pre-install the locking bolt assembly 4 to initially connect the lower discharge port flange 2 and the upper discharge port flange 1 and allow them to move relative to each other. At the same time, pre-install the front sealing plate assembly 8 on the side of the upper discharge port flange 1 and the side of the lower discharge port flange 2, as well as the rear sealing plate assembly 9 on the rear end of the gate plate 5 in the direction of movement. Then, connect the rear end of the gate plate 5 in the direction of movement through the rear sealing plate assembly 9 to the output end of the cylinder 6.

[0093] When pre-installing the front sealing plate assembly 8, it can be connected separately to either the side of the lower discharge port flange 2 or the side of the upper discharge port flange 1. Similarly, when pre-installing the rear sealing plate assembly 9, it can be connected separately to either the side of the lower discharge port flange 2 or the side of the upper discharge port flange 1. Pre-installing the front and rear sealing plate assemblies 8 and 9 ensures that the lower discharge port flange 2 and the upper discharge port flange 1 can move relative to each other during subsequent operations, thereby adjusting the distance between them.

[0094] Step 4: Adjust the sealing state of the discharge port sealing assembly 7:

[0095] The upper end of the adjusting bolt 10 passes through the upper surface of the lower outlet flange 2 and engages with the lower part of the upper outlet flange 1, so that the upper end of the adjusting bolt 10 extends a certain length beyond the upper surface of the upper outlet flange 1 and lifts the upper outlet flange 1, so that a certain distance is maintained between the upper surface of the lower outlet flange 2 and the upper outlet flange 1, while the side sealing gasket 31 maintains an elastic deformation state.

[0096] The gate valve 5 is moved back and forth to test the fit between the gate valve 5 and the outlet sealing assembly 7. When the gate valve is closed, the O-ring 72 is under appropriate compression deformation, and the lower surfaces of the first sealing ring 71 and the second sealing ring 73 are in contact with the upper surface of the gate valve 5 at the same time, so as to ensure that the gate valve 5 moves smoothly and has a good seal.

[0097] Step 5: Complete valve assembly:

[0098] When the fit between the outlet sealing assembly 7 and the gate component 5 meets the requirements, the locking bolt assembly 4 is installed to lock the upper outlet flange 1 and the lower outlet flange 2 together. Simultaneously, a nut 1001 is installed on the adjusting bolt 10 on the outer side of the lower surface of the lower outlet flange 2, so that the upper surface of the nut 1001 engages with the lower part of the lower outlet flange 2, preventing the adjusting bolt 10 from loosening. Then, the front sealing plate assembly 8 and the rear sealing plate assembly 9 are simultaneously connected to the sides of the upper outlet flange 1 and the lower outlet flange 2. Specifically, bolts are used to lock the upper end of the front sealing plate assembly 8 to the upper outlet flange 1, and simultaneously bolts are used to lock the lower end of the front sealing plate assembly 8 to the lower outlet flange 2, achieving sealing on the front side of the gate component 5 in the direction of movement. Similarly, bolts are used to lock the upper end of the rear sealing plate assembly 9 to the upper outlet flange 1, and simultaneously bolts are used to lock the lower end of the rear sealing plate assembly 9 to the lower outlet flange 2, achieving sealing on the rear end of the gate component 5 in the direction of movement.

[0099] The assembly method of the knife gate valve in this embodiment makes the valve easy to assemble and the fit between the outlet sealing assembly 7 and the gate component 5 easy to adjust. It also ensures smooth movement and good sealing of the gate component 5. When the second sealing ring 73 of the outlet sealing assembly 7 is worn or jammed, the second sealing ring 73 can still fit with the gate component 5 to achieve a good seal under the elastic deformation of the O-ring 72.

[0100] The working process of the knife gate valve in this embodiment is as follows:

[0101] like Figure 10 As shown, when the gate valve is opened, the O-ring 72 is in a free state, and at this time the lower part of the first sealing ring 71 is slightly higher than the lower part of the second sealing ring 73;

[0102] When the cylinder 6 drives the gate plate 5 to move forward, the gate plate 5 moves forward. When the gate plate 5 is below the first discharge hole 101, the powder falling from the first discharge hole 101 first falls onto the upper surface of the gate plate 5. As the gate plate 5 moves forward, it cuts off the powder flow from the first discharge hole 101.

[0103] During the process of cutting off the powder from the first discharge hole 101, the upper surface of the forward-moving gate plate 5 contacts the discharge port sealing assembly 7. The first sealing ring 71 blocks most of the powder on the upper surface of the gate plate 5 in the middle of the first sealing ring 71. Then, the small amount of powder remaining on the upper surface of the gate plate 5 is blocked and sealed again due to the sealing effect of the second sealing ring 73 and the upper surface of the gate plate 5, further ensuring the sealing effect.

[0104] like Figure 11As shown, when the gate valve is closed, the lower part of the first sealing ring 71 and the lower part of the second sealing ring 73 simultaneously contact and seal with the gate component 5. The gate component 5 lifts up the second sealing ring 73, and then the upper surface of the second sealing ring 73 compresses and deforms the O-ring 72, ensuring that the second sealing ring 73 and the upper surface of the gate component 5 are in a tight sealing state.

[0105] The above description is an explanation of the present invention and not a limitation thereof. The scope of the present invention is defined by the claims. Within the scope of protection of the present invention, any form of modification may be made.

Claims

1. A knife gate valve characterized by: The utility model provides a flange structure of the discharge port of the material, including upper discharge port flange (1) that first blanking hole (101) is arranged in the middle and lower discharge port flane (2) that second blanking hole (201) is arranged in the middle, first blanking hole (101) with second blanking hole (201) correspond, and the lower discharge port flange (2) on the both sides of second blanking hole (201) is provided with a plurality of adjusting bolts (10), and one end of adjusting bolt (10) passes through the upper surface of lower discharge port flange (2) and is matched with the lower part of upper discharge port flange (1), and the lower surface of upper discharge port flange (1) and the upper surface of lower discharge port flange (2) form the movable layer of damper, and the lower discharge port flange (2) on the both sides of second blanking hole (201) is further provided with a plurality of locking bolt assemblies (4), and locking bolt assembly (4) is matched with upper discharge port flange (1) and lower discharge port flane (2) simultaneously, and the inner wall surface of second blanking hole (201) is conical structure, and the big mouth of second blanking hole (201) faces upwards; The movable layer of damper is provided with the damper piece (5) corresponding with first blanking hole (101), and the lower surface of upper discharge port flange (1) is provided with the annular groove (102) concentric with first blanking hole (101), and the discharge port sealing assembly (7) is installed in the annular groove (102) and is matched, the lower part of discharge port sealing assembly (7) is matched with the upper surface of damper piece (5), and damper piece (5) moves relative to discharge port sealing assembly (7) to realize the opening and closing of damper valve, and the upper surface of lower discharge port flange (2) is provided with the guide structure (3) matched with the side surface of damper piece (5) in the direction of movement, and the side sealing pad (31) is arranged between the upper discharge port flange (1) and the lower discharge port flange (2) on the both sides of the direction of movement of damper piece (5), and the side surface of upper discharge port flange (1) and the side surface of lower discharge port flange (2) on the front side of the direction of movement of damper piece (5) are simultaneously matched with the front sealing plate assembly (8) and are installed, and the side surface of upper discharge port flange (1) and the side surface of lower discharge port flange (2) on the rear end of the direction of movement of damper piece (5) are simultaneously matched with the rear sealing plate assembly (9) and are installed, and the rear end of the direction of movement of damper piece (5) passes through rear sealing plate assembly (9) and is connected with the output end of air cylinder (6); The structure of discharge port sealing assembly (7) is: including the first sealing ring (71) that is matched with the inner side groove wall of annular groove (102), the lower part outer periphery of first sealing ring (71) is matched with the second sealing ring (73) and is installed, the upper surface of second sealing ring (73) is provided with O type ring (72), the upper part of O type ring (72) is matched with the bottom of annular groove (102), the inner ring of O type ring (72) is matched with the upper part outer periphery of first sealing ring (71), further including sealing compression ring (74), and the outer side groove wall of annular groove (102) and second sealing ring (73) are simultaneously matched with sealing compression ring (74), and the lower part of first sealing ring (71) and the lower part of second sealing ring (73) are matched with the upper surface of damper piece (5). The structure of the second sealing ring (73) comprises a second annular body (7301), the outer part of the upper end of the second annular body (7301) is provided with a second boss (7302) of annular structure, the lower end of the second annular body (7301) is an arc-shaped end face (7303) protruding downward, the second boss (7302) cooperates with the sealing compression ring (74), the inner wall surface of the second annular body (7301) cooperates with the lower outer peripheral surface of the first sealing ring (71), the upper end surface of the second annular body (7301) cooperates with the lower part of the O-shaped ring (72), and the arc-shaped end face (7303) cooperates with the upper surface of the gate plate member (5). When the gate valve is opened, the O-shaped ring (72) is in a free state, and the lower part of the first sealing ring (71) is slightly higher than the lower part of the second sealing ring (73); when the gate valve is closed, the O-shaped ring (72) is in a proper compression deformation amount, and the lower part of the first sealing ring (71) and the lower part of the second sealing ring (73) simultaneously contact and seal the gate plate member (5). The upper end of the adjusting bolt (10) passes through the upper surface of the lower discharge port flange (2) and cooperates with the lower part of the upper discharge port flange (1), the lower part of the adjusting bolt (10) is threadedly connected with the lower discharge port flange (2), the upper end of the adjusting bolt (10) protrudes from the upper surface of the upper discharge port flange (1) by a length and lifts the upper discharge port flange (1), so that a certain distance is maintained between the upper surface of the lower discharge port flange (2) and the upper discharge port flange (1), the distance not only makes the side sealing gasket (31) maintain an elastic deformation state to play a sealing role of the gate plate movable layer on both sides of the gate plate member (5), but also satisfies the installation of the discharge port sealing assembly (7) and the upper surface of the gate plate member (5) in a proper cooperation degree, so that the gate plate member (5) moves smoothly and is sealed well, and after the adjusting bolt (10) is adjusted, the locking bolt assembly (4) is installed to lock the upper discharge port flange (1) and the lower discharge port flange (2) together.

2. A knife gate valve as claimed in claim 1, characterized in that: The structure of the first sealing ring (71) comprises a first annular body (7101), the outer part of the upper end of the first annular body (7101) is provided with a first boss (7102) of annular structure, the inner wall surface of the first annular body (7101) cooperates with the inner side groove wall of the annular groove (102), the upper end surface of the first annular body (7101) cooperates with the bottom of the annular groove (102), the outer peripheral surface of the first boss (7102) cooperates with the inner ring of the O-shaped ring (72), the lower surface of the first boss (7102) cooperates with the upper part of the second sealing ring (73), and the lower end of the first annular body (7101) cooperates with the upper surface of the gate plate member (5).

3. A knife gate valve as claimed in claim 1, characterized in that: The structure of the sealing ring (74) is: including a ring body (7401), a plurality of mounting holes (7403) are arranged on the lower surface of the ring body (7401), the mounting holes (7403) are through holes, and an annular structure of a pressing block (7402) is arranged on the inner wall surface of the lower part of the ring body (7401), the pressing block (7402) is matched with the second sealing ring (73), and the outer peripheral surface of the ring body (7401) is matched with the outer side groove wall of the annular groove (102). A plurality of fasteners are arranged through the mounting holes (7403), one end of the fastener is matched with the bottom of the annular groove (102), and the other end of the fastener is matched with the ring body (7401).

4. A knife gate valve as claimed in claim 1, characterized in that: The gate plate (5) is in a plate structure, an inclined surface (501) is arranged on the upper surface of the front end of the moving direction of the gate plate (5), the inclined surface (501) is inclined to the lower side of the front end of the moving direction of the gate plate (5), and the included angle between the inclined surface (501) and the horizontal plane is 5°-20°.

5. A knife gate valve as claimed in claim 1, characterized in that: The structure of the guide structure (3) is: including a guide body (301) in a rectangular block structure, a supporting block (302) is arranged on one side of the lower part of the guide body (301), the upper surface of the supporting block (302) and the side surface of the guide body (301) are matched with the gate plate (5) at the same time, the lower surface of the guide body (301) is matched with the upper surface of the lower discharge port flange (2), the lower surface of the side sealing gasket (31) is matched with the upper surface of the guide body (301), and the upper surface of the side sealing gasket (31) is matched with the lower surface of the upper discharge port flange (1).

6. A knife gate valve as claimed in claim 1, characterized in that: The structure of the front sealing plate assembly (8) is: including a front sealing plate (81), the upper end of the front sealing plate (81) is connected with the side surface of the upper discharge port flange (1), the lower end of the front sealing plate (81) is connected with the side surface of the lower discharge port flange (2), the front sealing gasket (82) is arranged between the upper discharge port flange (1) and the lower discharge port flange (2) and the front sealing plate (81), the end part of the side sealing gasket (31) and the end part of the guide structure (3) are matched with the front sealing gasket (82) at the same time.

7. A knife gate valve as claimed in claim 1, characterized in that: The structure of the rear sealing plate assembly (9) is: including a rear sealing plate (91), the upper end of the rear sealing plate (91) is connected with the side surface of the upper discharge port flange (1), the lower end of the rear sealing plate (91) is connected with the side surface of the lower discharge port flange (2), the rear sealing gasket (92) is arranged between the upper discharge port flange (1) and the lower discharge port flange (2) and the rear sealing plate (91), the end part of the side sealing gasket (31) and the end part of the guide structure (3) are matched with the rear sealing gasket (92) at the same time, the rear sealing plate (91) is provided with a first gate plate hole (9101) matched with the gate plate (5), and the rear sealing gasket (92) is provided with a second gate plate hole (9201) matched with the gate plate (5) in sealing.

8. A method of assembling a knife gate valve as claimed in claim 1, characterized by: The steps include: First step: installing the discharge port sealing assembly (7) in the upper discharge port flange (1): The inner side groove wall of the annular groove (102) of the upper discharge port flange (1) is sequentially sleeved with the first sealing ring (71), the O-shaped ring (72), the second sealing ring (73) and the sealing compression ring (74) from inside to outside, the sealing compression ring (74) limits the first sealing ring (71), the O-shaped ring (72) and the second sealing ring (73) in the annular groove (102), the upper part of the O-shaped ring (72) is matched with the bottom of the annular groove (102), the lower part of the O-shaped ring (72) is matched with the upper surface of the second sealing ring (73), the inner ring of the O-shaped ring (72) is matched with the upper outer surface of the first sealing ring (71), at this time, the O-shaped ring (72) is in the initial state, the lower surface of the second sealing ring (73) is lower than the lower surface of the first sealing ring (71); The second step is to preliminarily assemble the related parts of the lower discharge port flange (2): The guide structure (3) and the side sealing gasket (31) are symmetrically installed on the upper surface of the lower discharge port flange (2), and the shutter part (5) is matched with the guide structure (3); The third step is to preliminarily assemble the upper discharge port flange (1) and the lower discharge port flange (2): The locking bolt assembly (4) is preliminarily installed, the lower discharge port flange (2) is preliminarily connected with the upper discharge port flange (1) and can move relatively, the front sealing plate assembly (8) at the front side of the moving direction of the shutter part (5) and the rear sealing plate assembly (9) at the rear end of the moving direction of the shutter part (5) are preliminarily installed on the side surface of the upper discharge port flange (1) and the side surface of the lower discharge port flange (2), and the rear end of the moving direction of the shutter part (5) is connected with the output end of the air cylinder (6) through the rear sealing plate assembly (9); The fourth step is to adjust the sealing state of the discharge port sealing assembly (7): The upper end of the adjusting bolt (10) is matched with the lower part of the upper discharge port flange (1) through the upper surface of the lower discharge port flange (2), the upper end of the adjusting bolt (10) is stretched out of the upper surface of the upper discharge port flange (1) by a length, the upper discharge port flange (1) is lifted up, the upper surface of the lower discharge port flange (2) and the upper discharge port flange (1) are kept at a certain distance, and the side sealing gasket (31) maintains the elastic deformation state; The shutter part (5) is moved forward and backward to test the matching degree of the shutter part (5) and the discharge port sealing assembly (7), when the shutter valve is closed, the O-shaped ring (72) is in a proper compression deformation amount, the lower surfaces of the first sealing ring (71) and the second sealing ring (73) are in contact with the upper surface of the shutter part (5), and the smooth movement and good sealing of the shutter part (5) are ensured; The fifth step is to complete the valve assembly: When the matching degree of the discharge port sealing assembly (7) and the shutter part (5) meets the requirements, the locking bolt assembly (4) is installed to lock the upper discharge port flange (1) and the lower discharge port flange (2) together, the nut (1001) is installed on the adjusting bolt (10) outside the lower surface of the lower discharge port flange (2), the upper surface of the nut (1001) is matched with the lower part of the lower discharge port flange (2), then the front sealing plate assembly (8) and the rear sealing plate assembly (9) are connected with the side surfaces of the upper discharge port flange (1) and the lower discharge port flange (2) at the same time.

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