Gate valve and control method

Abstract

The invention relates to the technical field of gate valves, and particularly discloses a gate valve and a control method.The gate valve comprises a valve body internally provided with a valve cavity, a gate located in the valve cavity and in sliding fit with the valve body in the Z-axis direction, and a driving mechanism arranged above the valve body and connected with the gate; the gate plate comprises a stress plate connected with the driving mechanism and a sealing plate which is parallel to the stress plate and hinged to the stress plate. A limiting plate which abuts against the bottom of the sealing plate in a matched mode is arranged in the valve cavity. A through hole is further formed in the valve body; the limiting plate is positioned below the through hole; when the limiting plate abuts against the sealing plate, the stress plate is driven by the driving mechanism to move towards the side away from the sealing plate, so that the side, away from the stress plate, of the sealing plate is in contact with the valve body to seal the through hole. Mounting and dismounting are convenient and fast, the sealing ring is controlled not to make contact with the valve body when the gate plate slides, the sealing ring makes contact with the valve body only during sealing through vertical positive pressure of the sealing ring and the valve body, abrasion is small, and the service life of the device is greatly prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of gate valves, and more particularly to a gate valve and a control method thereof. Background Art

[0002] In the existing equipment for reducing molybdenum trioxide to molybdenum dioxide, the sealing of the furnace door generally adopts a flap structure, which has the disadvantages of large opening and closing space, resulting in too large a volume of the transition chamber, too long a time for purging hydrogen, and increased process time and too high energy consumption. Secondly, the seal of the flap valve will produce friction with the sealing surface of the furnace tube when opening and closing, so that the seal is easily damaged, affecting the service life;

[0003] In the prior art, most of the gate valves use wedge blocks for friction and extrusion sealing, which will also cause high wear of the sealing material, greatly reducing its sealing effect. In addition, the processing and installation requirements of the wedge blocks are very high and cannot meet the needs of use. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a gate valve and a control method;

[0005] The solution adopted by the present invention to solve the technical problem is:

[0006] A gate valve comprises a valve body with a valve cavity arranged inside, a gate plate located in the valve cavity and slidingly matched with the valve body along the Z-axis direction, and a driving mechanism arranged above the valve body and connected to the gate plate;

[0007] The gate plate includes a force-bearing plate which is transmission-connected to the driving mechanism and is located in the valve cavity, and a sealing plate which is arranged parallel to the force-bearing plate and is hinged to each other;

[0008] A limit plate is arranged in the valve cavity and is in abutment with the bottom of the sealing plate; a through hole communicating with the valve cavity is also arranged on the valve body; the limit plate is located below the through hole;

[0009] When the limiting plate abuts against the sealing plate, the force-bearing plate moves away from the sealing plate under the drive of the driving mechanism, so that the side of the sealing plate away from the force-bearing plate contacts and fits with the valve body to close the through hole.

[0010] In some possible implementations, there is a gap between the sealing plate and the force-bearing plate; and the distance between the sealing plate and the limiting plate is smaller than the distance between the force-bearing plate and the limiting plate.

[0011] In some possible implementations, a sealing ring is provided on a side of the sealing plate away from the force-bearing plate;

[0012] When the sealing plate abuts against the limiting plate, the sealing ring is sleeved on the outside of the through hole and abuts against the valve body.

[0013] In some possible embodiments, the force-bearing plate and the sealing plate are hinged to each other via waist hole hinges; the waist hole hinges are in multiple groups; the force-bearing plate is provided with multiple groups of U-shaped grooves that cooperate with the sealing plate to form an installation cavity; the waist hole hinges are installed in the installation cavity.

[0014] In some possible embodiments, the waist hole hinge includes a hinge rod 1 arranged along the X-axis direction and installed on the force-bearing plate, a hinge rod 2 arranged parallel to the hinge rod 1 and installed on the sealing plate, and a connecting rod which is mounted on the outside of the hinge rod 1 and the hinge rod 2 and rotatably matched.

[0015] In some possible implementations, the force-bearing plate and the sealing plate are connected via an elastic retaining frame; a through groove is provided on the force-bearing plate; and the through groove cooperates with the sealing plate to form a concave cavity for installing the elastic retaining frame.

[0016] In some possible implementations, the elastic retaining frame includes a bracket located in the cavity and mounted on the sealing plate, and a spring arranged along the Z-axis direction and connected to the bracket at one end; the other end of the spring is connected to the force-bearing plate.

[0017] In some possible implementations, a universal ball bearing 1 is disposed on a side of the force-bearing plate away from the sealing plate; and a universal ball bearing 2 that slides with the valve body is disposed on the end surface of the force-bearing plate.

[0018] In some possible implementations, the driving mechanism is a pneumatic cylinder or an electric cylinder.

[0019] A control method for a gate valve according to the above specifically comprises the following steps:

[0020] When sealing, the driving mechanism applies force to the force-bearing plate to control the gate plate to move toward the side close to the limit plate, and makes the bottom of the sealing plate contact with the limit plate;

[0021] The driving mechanism continuously applies a force to the force-bearing plate, and the force-bearing plate will move away from the sealing plate, so that the universal ball bearing will contact and fit with the inner side of the valve body. At this time, the universal ball bearing will apply a reaction force to the sealing plate, so that the sealing plate will move away from the force-bearing plate, and finally the sealing ring will contact and abut against the valve body, completing the sealing of the through hole.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The present invention is convenient to install and disassemble. The sealing ring is controlled not to contact the valve body when the gate slides. The vertical positive pressure of the sealing ring and the valve body is applied so that the sealing ring contacts the valve body only when sealing, resulting in less wear and tear, thereby greatly improving the service life of the device. The present invention has a simple structure and strong practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0025] Figure 2 It is a front view of the present invention;

[0026] Figure 3 It is a structural schematic diagram of the gate plate in the present invention;

[0027] Figure 4 It is a side view of the gate in the present invention;

[0028] Figure 5 is a cross-sectional view of the present invention;

[0029] Figure 6 It is a rear view of the gate plate in the present invention;

[0030] Figure 7 It is a schematic diagram of the internal structure of the present invention;

[0031] Among them: 1. valve body; 11. through hole; 12. limit plate; 2. gate; 21. sealing plate; 211. sealing ring; 22. force plate; 221. U-shaped groove; 222. through groove; 3. driving mechanism; 4. waist hole hinge; 41. hinge rod one; 42. hinge rod two; 43. connecting rod; 5. elastic retaining frame; 51. bracket; 52. spring; 6. universal ball bearing one; 7. universal ball bearing two. DETAILED DESCRIPTION

[0032] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral body; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. The "first", "second" and similar words mentioned in this application do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, "one" or "one" and other similar words do not indicate a quantity restriction, but indicate the existence of at least one. In the implementation of this application, "and / or" describes the association relationship of the associated objects, indicating that there can be three relationships, for example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In the description of the embodiments of the present application, unless otherwise specified, the meaning of "multiple" refers to two or more. For example, multiple positioning columns refer to two or more positioning columns. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] The present invention is described in detail below.

[0034] like Figure 1-Figure 7 As shown:

[0035] A gate valve comprises a valve body 1 with a valve cavity arranged inside, a gate plate 2 located in the valve cavity and slidingly matched with the valve body 1 along the Z-axis direction, and a driving mechanism 3 arranged above the valve body 1 and connected to the gate plate 2;

[0036] The gate plate 2 comprises a force-bearing plate 22 which is transmission-connected to the driving mechanism 3 and is located in the valve cavity, and a sealing plate 21 which is arranged parallel to the force-bearing plate 22 and is hinged to each other; a sealing ring 211 is arranged on the side of the sealing plate 21 away from the force-bearing plate 22; when the sealing plate 21 abuts against the limiting plate 12, the sealing ring 211 is sleeved on the outer side of the through hole 11 and abuts against the valve body 1;

[0037] A limit plate 12 is provided in the valve cavity and is in contact with the bottom of the sealing plate 21; a through hole 11 communicating with the valve cavity is also provided on the valve body 1; the limit plate 12 is located below the through hole 11;

[0038] When the limiting plate 12 abuts against the sealing plate 21, since the force-bearing plate 22 and the sealing plate 21 are hinged to each other, the force-bearing plate 22 moves away from the sealing plate 21 under the drive of the driving mechanism 3, so that the side of the sealing plate 21 away from the force-bearing plate 22 contacts and fits with the valve body 1 to close the through hole 11.

[0039] Specifically, the valve cavity is of a rectangular structure, and the valve body 1 includes a top plate, two sets of parallel side plates installed below the top plate, and end plates respectively connected to the two sets of side plates to form the valve cavity; the bottom of the valve cavity has an opening, and the two sets of side plates are provided with through holes 11 that are connected to the valve cavity and are symmetrically arranged;

[0040] When used for furnace door sealing, the two groups of through holes 11 will be connected to the door opening of the furnace door, and the gate plate 2 will be controlled by the driving mechanism 3 to move downward along the Z-axis direction to close the through holes 11, thereby achieving sealing of the door opening of the furnace door;

[0041] Specifically, when sealing is required, the driving mechanism 3 controls the force-bearing plate 22 to move along the Z-axis direction toward the side close to the limit plate 12; when the limit plate 12 abuts against the sealing plate 21, the force-bearing plate 22 moves toward the side away from the sealing plate 21 under the drive of the driving mechanism 3, so that the side of the sealing plate 21 away from the force-bearing plate 22 contacts and fits with the valve body 1 to close the through hole 11, thereby completing the sealing; when the gate plate 2 does not close the through hole 11, the sealing ring 211 on the sealing plate 21 and the side of the force-bearing plate 22 away from the sealing plate 21 do not contact the valve body 1.

[0042] With this arrangement, the sealing ring 211 will move along the Y-axis direction toward the side of the valve body 1 driven by the sealing plate 21 only after the sealing plate 21 contacts the limit plate 12, so that the sealing ring 211 is vertically pressed against the valve body 1; the sealing ring 211 will never contact the valve body 1 when the gate plate 2 moves along the Z-axis direction, thereby preventing the sealing ring 211 from being worn due to sliding friction, thereby avoiding affecting the service life.

[0043] In some possible implementations, in order to effectively realize that after the sealing plate 21 contacts and abuts against the limiting plate 12, the force-bearing plate 22 can move away from the sealing plate 21 and abut against the valve body 1; there is a gap between the sealing plate 21 and the force-bearing plate 22;

[0044] The distance between the sealing plate 21 and the limiting plate 12 is smaller than the distance between the force plate 22 and the limiting plate 12, so that when the sealing plate 21 abuts against the limiting plate 21, there is still a gap between the force plate 22 and the limiting plate 12, so that the limiting plate 21 will not restrict the force plate 22 from moving away from the sealing plate 21.

[0045] In some possible implementations, in order to effectively realize the hinge connection between the force-bearing plate 22 and the sealing plate 21, when the sealing plate 21 abuts against the limiting plate 12, the force-bearing plate 22 is driven by the driving mechanism 3 so that the force-bearing plate 22 and the sealing plate 21 respectively move to a side away from the sealing plate 21;

[0046] The force-bearing plate 22 and the sealing plate 21 are hinged to each other through the waist hole hinge 4; the waist hole hinge 4 is multiple groups; multiple groups of U-shaped grooves 221 are arranged on the force-bearing plate 22 to cooperate with the sealing plate 21 to form an installation cavity; the waist hole hinge 4 is installed in the installation cavity; the way of setting multiple groups of waist hole hinges 4 makes the force on the force-bearing plate 22 and the sealing plate 21 more uniform;

[0047] Specifically, the waist hole hinge 4 includes a hinge rod 1 41 arranged along the X-axis direction and installed on the force-bearing plate 22, a hinge rod 2 42 arranged parallel to the hinge rod 1 41 and installed on the sealing plate 21, and a connecting rod 43 which is fitted on the outside of the hinge rod 1 41 and the hinge rod 2 42 and rotates in cooperation with each other;

[0048] Specifically, Figure 5 As shown, when the sealing plate 21 abuts against the limit plate 12, the force plate 22 is continuously subjected to a force along the Z-axis direction close to the side of the limit plate 12, so that the connecting rod 43 rotates counterclockwise around the hinge rod 2, thereby driving the hinge rod 1 41 and the force plate 22 to move counterclockwise, and making the force plate 22 abut against the valve body 1.

[0049] In some possible implementations, the force-bearing plate 22 and the sealing plate 21 are connected via an elastic retaining frame 5 ; a through groove 222 is provided on the force-bearing plate 22 ; the through groove 222 cooperates with the sealing plate 21 to form a concave cavity for installing the elastic retaining frame 5 .

[0050] In some possible implementations, the elastic retainer 5 includes a bracket 51 located in the cavity and mounted on the sealing plate 21, and a spring 52 arranged along the Z-axis direction and connected to the bracket 51 at one end; the other end of the spring 52 is connected to the force-bearing plate 22;

[0051] By providing the elastic retainer 5, the sealing plate 21 and the force-bearing plate 22 can be restored to their initial positions after separation to prevent lifting dislocation;

[0052] In some possible implementations, a universal ball bearing 6 is provided on the side of the force-bearing plate 22 away from the sealing plate 21. When sealing, it moves to the side away from the sealing plate 21 under the drive of the force-bearing plate 22, and contacts and abuts with the side close to the valve body 1. Then, under the reaction force, the waist hole hinge 4 is cooperated to make the sealing plate 21 move to the side away from the force-bearing plate 22, and the sealing ring 211 abuts with the side close to the valve body 1, so that the sealing plate 21 and the valve body 1 are pressed tightly.

[0053] A universal ball bearing 7 which is slidably matched with the valve body 1 is arranged on the end surface of the force-bearing plate 22 for guiding the sliding of the entire gate plate 2 .

[0054] In some possible implementations, in order to effectively enable the gate plate 2 to perform linear motion along the Z-axis direction in the valve cavity, the driving mechanism 3 is a cylinder or an electric cylinder, and the driving mechanism 3 is connected to the valve body 1 through a flange. Therefore, if you want to replace the seal, you only need to disassemble the flange to take out the gate plate 2 as a whole.

[0055] A control method for a gate valve according to the above is used for sealing a furnace door, and specifically comprises the following steps:

[0056] When sealing, the driving mechanism 3 applies a force to the force-bearing plate 22 to control the gate plate 2 to move toward the side close to the limit plate 12, and makes the bottom of the sealing plate 21 abut against the limit plate 12;

[0057] The driving mechanism 3 continuously applies a force to the force-bearing plate 22, and the force-bearing plate 22 will move away from the sealing plate 21, so that the universal ball bearing 6 will contact and fit with the inner side of the valve body 1. At this time, the universal ball bearing 6 will apply a reaction force to the sealing plate 21, and cooperate with the waist-shaped hinge to drive the sealing plate 21 to move away from the force-bearing plate 22, and finally make the sealing ring 211 contact and abut with the valve body 1, completing the sealing of the through hole 11, thereby realizing the sealing of the furnace door opening.

[0058] The present invention is not limited to the above-mentioned specific embodiments, but extends to any new features or any new combination disclosed in this specification, as well as any new method or process steps or any new combination disclosed.

Claims

1. A gate valve, characterized in that: It includes a valve body with a valve cavity arranged inside, a gate plate located in the valve cavity and slidingly matched with the valve body along the Z-axis direction, and a driving mechanism arranged above the valve body and connected to the gate plate; The gate plate includes a force-bearing plate which is transmission-connected to the driving mechanism and is located in the valve cavity, and a sealing plate which is arranged parallel to the force-bearing plate and is hinged to each other; A limit plate is arranged in the valve cavity and is in abutment with the bottom of the sealing plate; a through hole communicating with the valve cavity is also arranged on the valve body; the limit plate is located below the through hole; When the limiting plate abuts against the sealing plate, the force-bearing plate moves away from the sealing plate under the drive of the driving mechanism, so that the side of the sealing plate away from the force-bearing plate contacts and fits with the valve body to close the through hole.

2. A gate valve according to claim 1, characterized in that: There is a gap between the sealing plate and the force-bearing plate; and the distance between the sealing plate and the limiting plate is smaller than the distance between the force-bearing plate and the limiting plate.

3. A gate valve according to claim 1, characterized in that: A sealing ring is provided on one side of the sealing plate away from the force-bearing plate; When the sealing plate abuts against the limiting plate, the sealing ring is sleeved on the outside of the through hole and abuts against the valve body.

4. A gate valve according to claim 1, characterized in that: The force-bearing plate and the sealing plate are hinged to each other via waist hole hinges; there are multiple sets of waist hole hinges; multiple sets of U-shaped grooves are arranged on the force-bearing plate to cooperate with the sealing plate to form an installation cavity; the waist hole hinges are installed in the installation cavity.

5. A gate valve according to claim 4, characterized in that: The waist hole hinge includes a hinge rod 1 arranged along the X-axis direction and installed on the force-bearing plate, a hinge rod 2 arranged parallel to the hinge rod 1 and installed on the sealing plate, and a connecting rod which is fitted onto the outside of the hinge rod 1 and the hinge rod 2 and rotatably matched.

6. A gate valve according to claim 1, characterized in that: The force-bearing plate and the sealing plate are connected via an elastic retaining frame; a through groove is arranged on the force-bearing plate; the through groove cooperates with the sealing plate to form a concave cavity for installing the elastic retaining frame.

7. A gate valve according to claim 6, characterized in that: The elastic retainer comprises a bracket located in the concave cavity and mounted on the sealing plate, and a spring arranged along the Z-axis direction and connected to the bracket at one end; the other end of the spring is connected to the force-bearing plate.

8. A gate valve according to claim 1, characterized in that: A universal ball bearing 1 is arranged on the side of the force-bearing plate away from the sealing plate; and a universal ball bearing 2 which is slidably matched with the valve body is arranged on the end surface of the force-bearing plate.

9. A gate valve according to claim 1, characterized in that: The driving mechanism is a pneumatic cylinder or an electric cylinder.

10. A control method for a gate valve according to any one of claims 1 to 9, characterized in that: The specific steps include: When sealing, the driving mechanism applies force to the force-bearing plate to control the gate plate to move toward the side close to the limit plate, and makes the bottom of the sealing plate contact with the limit plate; The driving mechanism continuously applies a force to the force-bearing plate, and the force-bearing plate will move away from the sealing plate, so that the universal ball bearing will contact and fit with the inner side of the valve body. At this time, the universal ball bearing will apply a reaction force to the sealing plate, so that the sealing plate will move away from the force-bearing plate, and finally the sealing ring will contact and abut against the valve body, completing the sealing of the through hole.

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