Elastic double-valve-plate sealing flat plate top and bottom cover machine

Abstract

An elastic double-valve-plate sealing flat top and bottom cover machine comprises a valve rod, a valve body assembly, a guide assembly and a valve plate assembly. The valve body assembly comprises a large shell, the guide assembly is fixed in the large shell, and the valve plate assembly is arranged in the guide assembly and can do reciprocating rectilinear motion in the guide assembly; the valve plate assembly comprises a valve plate bracket, valve plates, a wedge ball assembly, a valve rod pre-tightening disc spring set and valve plate disc spring sets, a limiting stud is arranged on one side of the valve plate bracket, the upper face and the lower face of the valve plate bracket are each provided with an open hole, the number of the valve plates is two, the valve plates are elastically arranged in the open holes through the multiple valve plate disc spring sets, and the wedge ball assembly is arranged in the valve rod pre-tightening disc spring set. The middle of the non-sealing face of the valve plate is provided with a slope wedge block matched with the wedge ball assembly, and the wedge ball assembly is connected with the valve plate bracket through the valve rod pre-tightening disc spring set. One end of the valve rod is connected with the executing mechanism, and the other end of the valve rod extends into the valve cavity and is connected with the valve rod pre-tightening disc spring set. The sealing performance of the bottom cover machine is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of flat bottom cover machine for coke drum head, specifically to a flat top and bottom cover machine with elastic double valve plates. BACKGROUND

[0002] The flat bottom cover machine is one of the key equipment of the automatic opening and closing device of the coke drum head of the delayed coking device. Its performance directly affects the safety of the coke drum production. In the past, the automatic opening and closing device for the coke drum head mainly included a flat bottom cover machine with a single valve plate or a fully automatic hydraulic opening and closing device.

[0003] At present, the fully automatic hydraulic opening and closing device uses a hydraulic system to control the opening and closing of the head, and needs to perform more actions, which is complicated to operate. The flat bottom cover machine with a single valve plate has the problem of large steam consumption for sealing, which causes unnecessary waste and increases energy consumption. At the same time, too much steam has a great impact on the subsequent process. UTILITY MODEL CONTENTS

[0004] The technical problem to be solved by the utility model is to provide a flat top and bottom cover machine with elastic double valve plates, which effectively improves the sealing performance of the bottom cover machine, solves the risk of medium leakage in the coke drum, and reduces the consumption of sealing steam.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the technical scheme of a flat top and bottom cover machine with elastic double valve plates, which comprises a valve rod, a valve body assembly, a guide assembly, and a valve plate assembly. The valve body assembly comprises a large shell, a valve body, a fixed valve seat, an elastic assembly, a packing gland, a floating valve seat, and a small shell. The valve body is connected between the large shell and the small shell, and a valve cavity is formed between the large shell, the small shell, and the valve body. The packing gland is arranged on the valve body, the elastic assembly is installed in the packing gland, and the lower surface of the elastic assembly is in contact with the floating valve seat in the valve body. The guide assembly is fixed in the large shell, and the valve plate assembly is arranged in the guide assembly and can move linearly in the guide assembly. The valve plate assembly comprises a valve plate bracket, two valve plates, a wedge ball assembly, a valve rod pre-tightening disc spring group, and a valve plate disc spring group. Limiting studs are arranged on one side of the valve plate bracket, and one opening is arranged on each of the upper and lower surfaces of the valve plate bracket. The two valve plates are arranged in the openings and are elastically arranged by the valve plate disc spring group. A beveled wedge block matched with the wedge ball assembly is arranged in the middle of the non-sealing surface of the valve plate. The wedge ball assembly is connected with the valve plate bracket through the valve rod pre-tightening disc spring group. One end of the valve rod is connected with an actuator, and the other end extends into the valve cavity and is connected with the valve rod pre-tightening disc spring group. When the valve is closed, the valve rod is driven by the actuator, the pre-tightening disc spring group acts on the valve plate bracket through the set valve plate assembly, and the valve plate assembly moves linearly in the closing direction. When the valve is fully closed, the upper and lower valve plates are in contact with the floating valve seat under the action of the valve plate disc spring group, the limiting studs are clamped on the large shell under the action of the valve rod thrust, and the additional thrust is converted into sealing force by the wedge ball assembly, thereby enhancing the sealing effect.

[0006] Preferably, the two valve plates are independent valve plate structures, and the two valve plates both play the role of independent partition and sealing.

[0007] Preferably, the valve plate bracket is internally provided with a guide groove for positioning the wedge-shaped block, so as to prevent the valve plate from rotating in the bracket.

[0008] Preferably, a plurality of symmetrical positioning grooves are formed on the annular edge of the non-sealing surface of the valve plate, and the positioning grooves are in one-to-one correspondence with the valve plate disc spring groups.

[0009] Preferably, a limiting block is further arranged on the annular edge of the non-sealing surface of the valve plate, and limiting screws are arranged on both sides of the limiting block.

[0010] Preferably, the wedge ball assembly is provided with a wedge-shaped connecting sub connected with the wedge-shaped block.

[0011] Preferably, the wedge ball assembly is provided with a ball body, which plays the role of centering.

[0012] Preferably, the valve rod pre-tightening disc spring group comprises a first disc spring, a guide sleeve, a locking nut and a disc spring guide rod, a plurality of first disc springs and the guide sleeve are sleeved on the disc spring guide rod, one end of the disc spring guide rod is connected with the wedge ball assembly, and the other end is provided with the locking nut.

[0013] Preferably, the valve plate disc spring group comprises a disc spring positioning sleeve, a second disc spring and a disc spring positioning shaft, a plurality of second disc springs are sleeved on the disc spring positioning shaft, and the top end of the disc spring positioning shaft is connected with the disc spring positioning sleeve.

[0014] According to the above technical scheme, the utility model has the beneficial effects that:

[0015] 1. The utility model provides the sealing force of the valve plate disc spring group in the valve plate assembly, the double valve plates are independent valve plates, play the role of independent partition, realize better sealing effect, reduce the medium leakage in the coke tower and the consumption of the sealing steam.

[0016] 2. The utility model designs the matching structure of the wedge ball assembly and the valve plate wedge-shaped block, can additionally increase the sealing force of the valve plate by increasing the thrust of the valve rod, and further improves the sealing effect.

[0017] 3. The utility model sets the pre-tightening disc spring group between the wedge ball assembly and the valve plate bracket, sets a certain pre-tightening force in advance during assembly, prevents the wedge-shaped block assembly and the valve plate wedge-shaped block from acting in advance during the valve closing process, and avoids the jamming problem caused by the early expansion of the valve plate. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a structural schematic view of the utility model;

[0019] Figure 2 is a structural schematic view of a valve plate assembly;

[0020] Figure 3 is a structural schematic view of a valve plate disc spring set;

[0021] Figure 4 is a structural schematic view of a valve plate;

[0022] Figure 5 is a structural schematic view of a wedge ball assembly;

[0023] Figure 6 is a structural schematic view of a valve stem pre-tightening disc spring set.

[0024] Marked in the figure: 1. valve stem, 2. packing part, 3. large shell, 4, guide assembly, 5, valve body, 6. fixed valve seat, 7. elastic assembly, 8. packing gland, 9. floating valve seat, 10. valve plate assembly, 1001. limit stud, 1002. valve plate bracket, 1003. valve plate, 100301. valve plate body, 100302. wedge block, 100303. limit block, 100304. limit screw, 100305. positioning groove, 1004. wedge ball assembly, 100401. wedge joint, 100402. ball, 1005. valve stem pre-tightening disc spring set, 100501. first disc spring, 100502. guide sleeve, 100503. locking nut, 100504. disc spring guide rod, 1006. valve plate disc spring set, 100601. disc spring positioning sleeve, 100602. second disc spring, 100603. disc spring positioning shaft, 11. small shell. DETAILED DESCRIPTION

[0025] The utility model will be further explained in detail below in combination with the drawings and specific embodiments.

[0026] The structure, proportion, size and the like shown in the drawings of the specification are merely used to cooperate with the content disclosed in the specification, to enable persons skilled in the art to understand and read, and are not used to limit the limiting conditions that can be implemented by the utility model, so they do not have technical substantive significance. Any modification of structure, change of proportional relationship or adjustment of size, without affecting the effects that can be produced by the utility model and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed by the utility model.

[0027] Meanwhile, it needs to be explained that the meaning of "several" is two or more than two; the terms "upper", "lower", "left", "right", "front end", "rear end" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, only for the convenience of describing the utility model and simplifying the description, and not indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the utility model. The change or adjustment of the relative relationship, without substantial change of the technical content, is also regarded as the scope of the utility model that can be implemented. The meaning of "group" is two or more than two. "Disc spring" is not limited to disc spring, including cylindrical coil spring, variable diameter coil spring, ring spring and the like. "Certain" is only for the purpose of description, and can include any numerical value.

[0028] As shown in Figure 1 An elastic double valve plate sealing flat top and bottom cover machine, including valve rod 1, valve body assembly, guide assembly 4 and valve plate assembly 10.

[0029] The valve body assembly includes a large shell 3, a valve body 5, a fixed valve seat 6, an elastic assembly 7, a packing gland 8, a floating valve seat 9 and a small shell 11, the large shell 3 is provided with a packing part 2 at one end, the large shell 3 and the small shell 11 are connected with the valve body 5, the large shell 3, the small shell 11 and the valve body 5 form a valve cavity, the valve body 5 is provided with the packing gland 8, the packing gland 8 is installed with the elastic assembly 7, the lower surface of the elastic assembly 7 is in contact with the floating valve seat 9 in the valve body 5, the guide assembly 4 is fixed in the large shell 3, the valve plate assembly 10 is arranged in the guide assembly 4 and can do reciprocating linear motion in the guide assembly 4.

[0030] Specifically, the cavity of the bottom cover machine is a pressure-bearing cavity, and steam higher than the medium pressure in the coke tower is introduced into the cavity to provide auxiliary sealing.

[0031] In the embodiment, the guide assembly 4 is fixed in the valve body 5 by bolts, and the guide assembly 4 plays a positioning and supporting role to prevent the valve plate 1003 from deviating from the correct position under the action of the valve plate disc spring group 106.

[0032] The valve plate assembly 10 includes a valve plate bracket 1002, a valve plate 1003, a wedge ball assembly 1004, a valve rod pre-tightening disc spring group 1005 and a valve plate disc spring group 1006, one side of the valve plate bracket 1002 is provided with a limiting stud 1001, the upper and lower surfaces of the valve plate bracket 1002 are each provided with an opening, the valve plate 1003 is provided with two plates and is elastically arranged in the opening through the valve plate disc spring group 1006, the valve plate body 100301 is provided with a slope wedge block 100302 matched with the wedge ball assembly 1004 in the middle of the non-sealing surface, and the wedge ball assembly 1004 is connected with the valve plate bracket 1002 through the valve rod pre-tightening disc spring group 1005;

[0033] The valve stem 1 is connected to an actuator at one end and extends into the valve cavity and is connected to the valve stem pre-tightening disc spring set 1005. When the valve is closed, the valve stem 1 is driven by the actuator, and the valve plate assembly 10 is driven as a whole in the closing direction by the set valve stem pre-tightening disc spring set 1005 acting on the valve plate bracket 1002, reaching the fully closed position. The upper and lower valve plates 1003 are in contact with the floating valve seat 9 under the action of the valve plate disc spring set 1006, and the limiting stud 1001 is clamped on the large shell 3 under the action of the thrust of the valve stem 1. The additional thrust is converted into sealing force by the wedge ball assembly 1004, enhancing the sealing effect.

[0034] The two valve plates 1003 are independent valve plate structures, both of which play the role of independent separation and sealing.

[0035] The valve plate bracket 1002 is provided with a guide groove for positioning the wedge block 100302 to prevent the valve plate from rotating in the bracket.

[0036] The valve plate body 100301 is provided with a plurality of symmetrical positioning grooves 100305 on the annular edge of the non-sealing surface, and the positioning grooves 100305 correspond one-to-one to the valve plate disc spring set 1006.

[0037] The valve plate body 100301 is also provided with a limiting block 100303 on the annular edge of the non-sealing surface, and the limiting block 100303 is provided with limiting screws 100304 on both sides.

[0038] The wedge ball assembly 1004 is provided with a wedge-shaped coupling 100401 connected to the wedge block 100302, and the wedge ball assembly 1004 is also provided with a ball 100402 for centering. When the valve plate 1003 is not flat, it can be adjusted by the ball 100402.

[0039] The valve stem pre-tightening disc spring set 1005 includes a first disc spring 100501, a guide sleeve 100502, a locking nut 100503, and a disc spring guide rod 100504. The disc spring guide rod 100504 is provided with a plurality of first disc springs 100501 and guide sleeves 100502, one end of the disc spring guide rod 100504 is connected to the wedge ball assembly 1004, and the other end is provided with the locking nut 100503. Specifically, the pre-tightening disc spring set is set with a certain pre-tightening force in advance during assembly, and is locked by the nut to prevent the wedge ball assembly 1004 from acting on the wedge block 100302 in advance during the closing process of the valve plate assembly 10, causing the valve plate 1003 to open in advance and causing the valve plate 1003 to be blocked.

[0040] The valve plate disc spring group 1006 comprises a disc spring positioning sleeve 100601, a second disc spring 100602 and a disc spring positioning shaft 100603, a plurality of second disc springs 100602 are sleeved on the disc spring positioning shaft 100603, and the top end of the disc spring positioning shaft 100603 is connected with the disc spring positioning sleeve 100601.

[0041] It should be noted that the above embodiments are only used to illustrate the present application, but the present application is not limited to the above embodiments, and any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present application all fall within the protection scope of the present application.

Claims

1. A flexible double valve plate sealing flat top and bottom capping machine characterized by: It comprises a valve stem (1), a valve body assembly, a guide assembly (4) and a valve plate assembly (10); The valve body assembly comprises a large shell (3), a valve body (5), a fixed valve seat (6), an elastic assembly (7), a packing gland (8), a floating valve seat (9) and a small shell (11), the valve body (5) is connected between the large shell (3) and the small shell (11), the large shell (3), the small shell (11) and the valve body (5) form a valve cavity, the packing gland (8) is arranged on the valve body (5), the elastic assembly (7) is installed in the packing gland (8), the lower surface of the elastic assembly (7) is in contact with the floating valve seat (9) in the valve body (5), the guide assembly (4) is fixed in the large shell (3), the valve plate assembly (10) is arranged in the guide assembly (4) and can make reciprocating linear motion in the guide assembly (4). The valve plate assembly (10) comprises a valve plate bracket (1002), a valve plate (1003), a wedge ball assembly (1004), a valve stem pre-tightening disc spring group (1005) and a valve plate disc spring group (1006), one side of the valve plate bracket (1002) is provided with a limiting stud (1001), the upper and lower surfaces of the valve plate bracket (1002) are each provided with an opening, the valve plate (1003) is provided with two plates and is elastically arranged in the opening through the valve plate disc spring group (1006), the non-sealing surface of the valve plate (1003) is provided with a beveled wedge-shaped block (100302) matched with the wedge ball assembly (1004), and the wedge ball assembly (1004) is connected with the valve plate bracket (1002) through the valve stem pre-tightening disc spring group (1005). One end of the valve stem (1) is connected with an actuator, the other end extends into the valve cavity and is connected with the valve stem pre-tightening disc spring group (1005), when the valve is closed, the valve stem (1) is driven by the actuator, the pre-tightening disc spring group acts on the valve plate bracket (1002) through the set pre-tightening disc spring group, the valve plate assembly (10) is driven to move linearly in the closing direction, reaches a full closing position, the upper and lower valve plates (1003) are in contact with the floating valve seat (9) under the action of the valve plate disc spring group (1006), the limiting stud (1001) is clamped on the large shell (3) under the action of the pushing force of the valve stem (1), and the additional pushing force is converted into a sealing force through the wedge ball assembly (1004), so that the sealing effect is enhanced.

2. A flexible double valve plate seal flat top and bottom capper according to claim 1, characterized in that: The two valve plates (1003) are independent valve plate structures, and the two valve plates (1003) both play the roles of independent partition and sealing.

3. A flexible double valve plate seal flat top and bottom capper according to claim 1, wherein: The valve plate bracket (1002) is provided with a guide groove for positioning the wedge-shaped block (100302), so that the valve plate (1003) is prevented from rotating in the bracket.

4. A flexible double valve plate seal flat top and bottom capper according to claim 1, wherein: A plurality of positioning grooves (100305) are formed on the annular edge of the non-sealing surface of the valve plate (1003), and the positioning grooves (100305) correspond to the valve plate disc spring group (1006) one by one.

5. A flexible double valve plate seal flat top and bottom capper according to claim 4, wherein: A limiting block (100303) is further arranged on the annular edge of the non-sealing surface of the valve plate (1003), and limiting screws (100304) are arranged on the two sides of the limiting block (100303).

6. A flexible double valve plate seal flat top and bottom capper according to claim 1, wherein: The wedge ball assembly (1004) is provided with a wedge joint (100401) connected with the wedge block (100302).

7. A flexible double valve plate seal flat top and bottom capper according to claim 1, wherein: The wedge ball assembly (1004) is provided with a ball (100402) for centering.

8. A flexible double valve plate seal flat top and bottom capper according to claim 1, wherein: The valve rod pre-tightening disc spring group (1005) comprises a first disc spring (100501), a guide sleeve (100502), a locking nut (100503) and a disc spring guide rod (100504), the disc spring guide rod (100504) is sleeved with a plurality of first disc springs (100501) and guide sleeves (100502), one end of the disc spring guide rod (100504) is connected with the wedge ball assembly (1004), and the other end is provided with the locking nut (100503).

9. A flexible double valve plate seal flat top and bottom capper according to claim 1, wherein: The valve plate disc spring group (1006) comprises a disc spring positioning sleeve (100601), a second disc spring (100602) and a disc spring positioning shaft (100603), the disc spring positioning shaft (100603) is sleeved with a plurality of second disc springs (100602), and the top end of the disc spring positioning shaft (100603) is connected with the disc spring positioning sleeve (100601).

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