Packing automatic sealing and self-tightening system

Abstract

The present invention relates to the technical field of wellhead sealing, and is a packing automatic sealing self-tightening system, comprising a left valve core, a right valve core, a first drive assembly, a sealing packing, a second drive assembly and a cross-shaped sealing housing. The present invention has a reasonable and compact structure. When the light rod in the penetration hole is not in the center, the right valve core moves to the left, so that the eccentric light rod can move along the inner wall of the guide groove to the right sealing groove, which has a straightening effect on the eccentric light rod, and then the guide part moves to the right again to seal the guide groove, and finally the outer side of the light rod is in sealing contact with the inner wall of the sealing hole, thereby playing the effect of closing the penetration hole. When the sealing packing on site is punctured, the second drive assembly works and compresses the sealing packing through the compression sleeve, thereby preventing and stopping the sealing packing from continuing to puncture. When the light rod leaks or steam blowout occurs, the penetration hole can be quickly and timely closed by the first drive assembly and the second drive assembly, thereby ensuring the safe operation of the wellhead blowout preventer of the pumping unit and reducing the occurrence of wellhead pollution events.

Description

Technical Field

[0001] The invention relates to the technical field of wellhead sealing, in particular to a packing automatic sealing and self-tightening system. Background Art

[0002] In the daily production and operation of oil fields, the wellheads of oil wells are required to remain sealed to ensure safe production and prevent environmental pollution caused by leakage, bubbling, puncture and leaking. When packing puncture and leakage are found on site, operators need to tighten the wellhead packing. However, due to the influence of many uncertain factors such as the operating experience of operators and the timeliness of operation, oil leakage and environmental pollution at the wellhead cannot be effectively prevented. When a blowout occurs, operators need to wear protective equipment, first perform emergency shutdown and brake, and then close the gate blowout preventer. At present, it takes 12 turns to close the blowout preventer in one direction, and 24 turns to close the entire blowout preventer. The time efficiency of accident handling is reduced, and the operation of operators is very laborious and inefficient.

[0003] A Chinese patent document with a publication number of CN216922072U discloses a manual switch device for a ram blowout preventer of an oil well, which includes a gear assembly, wherein the gear assembly includes a first main shaft and a second main shaft, wherein the first main shaft passes through a center hole of a first driving wheel and is transmission-connected to the first driving wheel, and the second main shaft passes through a center hole of a second driving wheel and is transmission-connected to the second driving wheel; the first main shaft is fixedly connected to one side of a steering gear, and the other side of the steering gear is fixedly connected to the second main shaft through a connecting assembly; the first driving wheel and the second driving wheel are meshed and transmission-connected with a first driven wheel and a second driven wheel respectively; and both ends of the ram blowout preventer are respectively matched and connected with the first driven wheel and the second driven wheel. Although the oil well gate blowout preventer can use the manual switch device to achieve synchronous opening and closing of the valve cores on both sides of the gate blowout preventer through the first driven wheel and the second driven wheel, when the light rod is in an eccentric position, the valve cores on both sides cannot straighten the light rod, so that the valve core is squeezed on the outside of the light rod and the blowout preventer cannot be closed normally. In addition, when a blowout accident occurs, manually closing the gate blowout preventer has a safety hazard and the blowout preventer cannot be closed in time. In addition, the connection between the first driven wheel, the second driven wheel and the gate blowout preventer requires a longer valve stem, which is not convenient for subsequent maintenance operations.

[0004] A Chinese patent document with the announcement number CN219754498U discloses a novel polished rod sealer, which includes a polished rod sealer, a lubricating device is arranged on the top of the polished rod sealer, and a rotating device is arranged inside the lubricating device; the lubricating device includes a polished rod, one end of which penetrates and extends to the outside of the polished rod sealer, a packing is movably mounted on the outer surface of the polished rod, a pressure ring is movably mounted on the outer surface of the polished rod, a pressure cap is movably mounted on the outer surface of the pressure ring, the inner surface of the pressure cap is threadedly connected to the outer surface of the polished rod sealer, and the outer surface of the pressure cap is fixedly mounted with a The gear is installed, and a mounting shell is fixedly installed on the outer surface of the polished rod sealer, and a butter tank is fixedly installed on the top of the mounting shell. When the polished rod sealer is in use, when maintenance or replacement of the packing is required, the mounting shell needs to be completely removed, which is troublesome, time-consuming and labor-intensive, and has a high maintenance cost. Moreover, when lubricating the polished rod, the lubricating oil in the butter tank cannot control the amount added to the polished rod, and after a period of time, the butter in the butter tank close to the polished rod adheres to the outer wall of the polished rod to lubricate the polished rod, but the fluidity of the butter is low, and the butter in the butter tank far away from the polished rod cannot lubricate the polished rod.

[0005] The Chinese patent document with the announcement number CN215256116U discloses an automatic pressure regulating packing automatic sealing self-tightening system, which includes: a driving device; a torque-fixing device for adjusting the torque, including: a rotating shaft, one end of which is connected to the output end of the driving device; a chassis, which is fixed on the rotating shaft, and the bottom surface of the chassis is against the shoulder of the rotating shaft; a housing, which is fixed on the rotating shaft and is located above the chassis; a second gear, which is fixed on the rotating shaft and is located in the housing; a double gear, which is fixed on the rotating shaft and is located above the second gear, and the upper gear of the double gear is fixed. There is a flange bearing, which is mounted on the end of the rotating shaft away from the driving device; there are two adjusting mechanisms, which are symmetrically arranged on the side of the shell, and one end of the adjusting mechanism is against the second gear and the double gear; a transmission device is used to transmit power and compress the packing cap, including: a first gear, which is mounted on the packing box, and the first gear is meshed with the upper wheel of the double gear; a threaded barrel, which is mounted on the packing box and fixed above the first gear; a packing cap, which is threadedly connected above the threaded barrel; a guide member, which vertically penetrates the packing cap and is connected to the packing box. The automatic pressure-regulating packing automatic sealing and self-tightening system has high requirements on the assembly accuracy between the threaded barrel and the packing cap. If the assembly accuracy is low, during use, the inner side of the threaded barrel is easy to wear with the outer side of the packing box, and the wear debris will affect the service life of the second thrust bearing, causing the entire transmission device to fail and increase the maintenance frequency.

[0006] The prior art generally adopts a hydraulic blowout preventer, but the original blowout preventer needs to be completely modified or replaced, which is costly; the second is a manual control device for a gate blowout preventer, which mainly realizes the function of opening the full-seal gate and closing the half-seal gate at the same time, but under normal operation of the oil pump, both the full-seal and half-seal gates are in the open state, and the operator needs to open them when closing, which is inefficient and has safety hazards. Moreover, when the light rod is eccentric, the valve core cannot fit together with the outer wall of the eccentric light rod, making it more difficult to close the blowout preventer.

[0007] In the prior art, operators tighten the wellhead packing without stopping the machine to prevent and stop the packing from leaking. This operation is affected by the number of wellhead equipment managed by the employees and their operating experience. There are many uncertain factors in the timeliness of the operation, and oil leakage and environmental pollution at the wellhead cannot be effectively prevented. Summary of the invention

[0008] The present invention provides a packing automatic sealing and self-tightening system, which overcomes the above-mentioned deficiencies of the prior art and can effectively solve the problems of low efficiency in accident handling, potential safety hazards and difficulty in sealing when the bare rod is eccentric in the existing packing automatic sealing and self-tightening system.

[0009] The technical scheme of the present invention is realized through the following measures: a packing automatic sealing and self-tightening system, comprising a left valve core, a right valve core, a first drive assembly, a sealing packing, a second drive assembly and a cross-shaped sealing shell, the upper end of the sealing shell is provided with a through hole for installing a light rod, the lower left end of the sealing shell is provided with a left sealing hole whose right end is connected with the through hole, a left valve core is installed in the left sealing hole, a right sealing hole whose left end is connected with the through hole is provided at the lower right end of the sealing shell corresponding to the position of the left sealing hole, a right valve core is installed in the right sealing hole, an arc-shaped guide groove which is passed through from top to bottom and opens to the left is provided at the left end of the right valve core, a right sealing groove which is passed through from top to bottom and whose left part is connected with the right part of the guide groove is provided at the left part of the right valve core, and a right end of the left valve core is provided with an arc-shaped guide groove which opens to the right and opens to the top A left sealing groove passes through the bottom, and a guide part is fixedly installed on the right end of the left valve core corresponding to the front and rear positions of the left sealing groove, and the outer side of the guide part matches the inner wall of the guide groove. A first driving assembly is provided on the outer side of the lower part of the sealing shell body, which can make the left valve core and the right valve core approach each other or move away from each other. The left sealing groove, the guide part and the right sealing groove can form a light rod sealing hole that passes through the top and bottom, and the inner wall of the light rod sealing hole can be in sealing contact with the outer side of the light rod. A sealing packing is provided on the inner side of the upper part of the sealing shell body, and a compression sleeve is provided on the upper end seat of the sealing packing. A packing gland that can press the compression sleeve is screwed on the outer side of the upper end of the sealing shell body, and a second driving assembly that can press the sealing packing through the compression sleeve after the packing gland is rotated is provided on the outer side of the upper part of the sealing shell body.

[0010] The following are further optimizations and / or improvements to the above technical solutions:

[0011] A left end cover can be fixedly installed on the left end of the lower part of the sealing housing, a left threaded hole is provided in the center of the left end cover, a left valve stem whose right end is fixedly installed with the left valve core is threadedly connected in the left threaded hole, the left end of the left valve stem is installed together with the corresponding position of the first drive assembly, a left sealing sleeve sleeved on the outer side of the left part of the left valve stem is fixedly installed on the left end of the left end cover, a left sealing packing is sleeved in the left sealing sleeve, a left compression sleeve is installed on the left end of the left sealing packing, a left sealing gland is threadedly connected to the outer side of the left sealing sleeve, and the inner side of the left part of the left sealing gland abuts against the left end of the left compression sleeve;

[0012] A right end cover is fixedly installed on the right end of the lower right end of the sealing shell, and a right threaded hole is provided in the center of the right end cover, and a right valve stem whose left end is fixedly installed with the right valve core is threadedly connected in the right threaded hole, and the right end of the right valve stem is installed together with the corresponding position of the first drive assembly, and a right sealing sleeve mounted on the outer side of the right part of the right valve stem is fixedly installed on the right end of the right end cover, a right sealing packing is mounted in the right sealing sleeve, a right pressing sleeve is installed on the right end of the right sealing packing, and a right sealing gland is threadedly connected to the outer side of the right sealing sleeve, and the inner side of the right part of the right sealing gland abuts against the right end of the right pressing sleeve.

[0013] As a preferred embodiment, the first drive assembly may include a left drive component and a right drive component, the left drive component includes a left drive motor and a left mounting frame, the left valve stem includes a left push rod, a left top plate and a left push rod, the right outer portion of the left push rod is screwed into the left threaded hole, a left mounting groove with an opening to the left is provided at the center of the left end of the left valve core, a left push rod is installed in the left mounting groove, a left top plate fixedly installed at the left end of the left push rod and clamped together with the right end of the left push rod, a left mounting frame fixedly installed at the left end of the left end cover, a left drive motor fixedly installed at the left end of the left mounting frame, and the right end of the output shaft of the left drive motor is transmission-connected to the left end of the left push rod;

[0014] The right drive assembly includes a right drive motor and a right mounting frame, the right valve stem includes a right push rod, a right top plate and a right push rod, the right outer side of the right part of the right push rod is screwed into the right threaded hole, a right mounting groove opening to the right is provided in the center of the right end of the right valve core, the right push rod is installed in the right mounting groove, the right end of the right push rod is fixedly installed with a right top plate clamped together with the left end of the right push rod, the right end of the right end cover is fixedly installed with a right mounting frame, the right end of the right mounting frame is fixedly installed with a right drive motor, and the left end of the output shaft of the right drive motor is transmission-connected with the right end of the right push rod.

[0015] The first drive assembly may further include a first control module, and the first control module is connected to the left drive motor and the right drive motor respectively.

[0016] The left end of the left top plate may be provided with a left card slot opening to the left, the left card slot comprising a left taking-out section and a left limiting section, the left taking-out section is in an arc shape opening downward, the left limiting section is in a U-shape opening upward, the lower part of the left taking-out section and the upper part of the left limiting section are connected to each other, and the right end of the left push rod is fixedly installed with a first limiting plate rotatably installed on the inner side of the lower part of the left limiting section, a U-shaped left limiting boss opening upward is fixed to the inner side of the left part of the left limiting section corresponding to the left side position of the first limiting plate, and an annular second limiting plate is fixedly installed on the outer side of the right part of the left push rod corresponding to the position between the left side of the left limiting boss and the right side of the left end cover;

[0017] A right clamping slot opening to the right is provided at the right end of the right top plate, and the right clamping slot includes a right taking-out section and a right limiting section. The right taking-out section is in an arc shape opening downward, and the right limiting section is in a U shape opening upward. The lower part of the right taking-out section and the upper part of the right limiting section are connected to each other, and a third limiting plate rotatably mounted on the inner side of the lower part of the right limiting section is fixedly installed on the left end of the right push rod, a U-shaped right limiting boss opening upward is fixedly installed on the inner side of the right part of the right limiting section corresponding to the right side of the third limiting plate, and a fourth annular limiting plate is fixedly installed on the outer side of the left part of the right push rod corresponding to the position between the right side of the right limiting boss and the left side of the right end cover.

[0018] As another preferred embodiment, the first drive assembly may include a fixed seat, a reducer, a first drive motor, a left driving gear and a right driving gear. A fixed seat is fixedly installed on the outer side of the lower part of the sealed housing, a reducer is fixedly installed on the front side of the fixed seat, the first drive motor is fixedly installed on the front side of the reducer, the rear end of the output shaft of the first drive motor is installed together with the input shaft of the reducer, a reduction box fixedly installed in the fixed seat is provided on the rear side of the reducer, a driving bevel gear is fixedly installed after the rear end of the output shaft of the reducer passes through the front side of the reduction box, a left rotating hole and a right rotating hole are respectively provided on the left and right sides of the reduction box, and a left The left output shaft is rotatably installed in the rotating hole, the left driven bevel gear meshing with the left part of the driving bevel gear is fixedly installed on the outer side of the right end of the left output shaft, the left driving gear is fixedly installed on the outer side of the left end of the left output shaft, and the left driven gear meshing with the left part of the left driving gear is fixedly installed on the outer side of the left part of the left valve stem; the right output shaft is rotatably installed in the right rotating hole, the right driven bevel gear meshing with the right part of the driving bevel gear is fixedly installed on the outer side of the left end of the right output shaft, the right driving gear is fixedly installed on the outer side of the right end of the right output shaft, and the right driven gear meshing with the right part of the right driving gear is fixedly installed on the outer side of the right part of the right valve stem.

[0019] The above-mentioned left valve stem may include a connecting plate and a pull rod. The outer side of the right part of the pull rod is screwed into the left threaded hole. A circular connecting plate is fixedly installed on the left end of the left valve core. A connecting groove opening to the left is provided on the left end of the connecting plate. The connecting groove includes a disassembly section and a rotation section. The disassembly section is in an arc shape opening downward, and the rotation section is in a U shape opening upward. The lower part of the disassembly section and the upper part of the rotation section are connected to each other. A right limiting ring platform is fixedly installed on the outer side of the right end of the pull rod and is rotatably installed on the inner side of the lower part of the rotating section. A U-shaped limiting platform opening upward is fixedly installed on the inner side of the left part of the rotating section corresponding to the left end position of the right limiting ring platform. A ring-shaped left limiting ring platform is fixedly installed on the outer side of the right part of the pull rod at the position between the left side of the limiting platform and the right side of the left end cover. The left driven gear is fixedly installed on the outer side of the left part of the pull rod on the left side of the left sealing cover. The right valve stem has the same structure as the left valve stem and is symmetrically arranged.

[0020] The above-mentioned driving mechanism may also include a second control module. A left connecting frame is fixedly installed on the left end of the left end cover. A first travel switch and a second travel switch are fixedly installed in the left connecting frame corresponding to the left and right positions of the left driving gear, respectively. The first travel switch and the second travel switch are both connected to the second control module, and the second control module is connected to the first driving motor.

[0021] The above-mentioned second driving assembly may include a support plate, a second driving motor, an adjusting screw and a self-tightening driving gear. A symmetrically distributed left supporting step and a right supporting step are provided on the outer side of the left and right parts of the sealing shell corresponding to the position below the packing gland. A mounting hole is provided on the upper side of the front of the support plate, and the left inner wall and the right inner wall of the mounting hole are both vertical surfaces. The distance between the left inner wall and the right inner wall of the mounting hole is the same as the distance between the vertical surfaces of the left supporting step and the right supporting step. The support plate is seated on the left supporting step and the right supporting step. An adjusting screw hole that passes through front and back is provided on the front side of the support plate. A limiting screw hole is provided on the front side of the sealing shell corresponding to the position of the adjusting screw hole. An adjusting screw screw that is screwed on the outer side of the rear part and is screwed in the limiting screw hole is provided in the adjusting screw hole. A second driving motor is fixedly installed on the lower side of the rear of the support plate. The output shaft of the second driving motor passes through the upper side of the support plate and is fixedly installed with a self-tightening driving gear. A self-tightening driven gear that meshes with the outer side of the upper part of the self-tightening driving gear is detachably fixedly installed on the outer side of the lower part of the packing gland.

[0022] The structure of the present invention is reasonable and compact. The lower end of the sealing shell is quickly installed with the wellhead equipment. The guide groove opens to the left and is an arc-shaped guide groove. The right part of the guide groove is connected with the left part of the right sealing groove. In this way, when the polished rod in the penetration hole is not in the center, the right valve core moves to the left, so that the eccentric polished rod can move along the inner wall of the guide groove to the right sealing groove, which can have a straightening effect on the eccentric polished rod. Then the guide part moves to the right and contacts with the guide groove for sealing. Finally, the left sealing groove, the guide part and the right sealing groove are close to each other to form a cylindrical polished rod sealing hole that penetrates from top to bottom. The outer side of the polished rod is connected to the right sealing groove. The inner wall of the sealing hole is in sealing contact, thereby having the effect of closing the penetration hole. When the sealing packing is punctured on site, the second drive assembly will work and compress the sealing packing through the compression sleeve while the oil pump is not stopping pumping, so that the sealing packing is in sealing contact with the outer side of the polished rod, thereby preventing and stopping the sealing packing from continuing to puncture and leak. It can replace the packing tightening operation of on-site operators. When the polished rod leaks or steam blowout occurs, the penetration hole can be closed promptly and quickly through the first drive assembly and the second drive assembly, thereby ensuring the safe operation of the wellhead blowout preventer of the oil pumping unit and reducing the occurrence of wellhead pollution incidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Attached Figure 1 It is a schematic diagram of the main structure when using embodiments 1 to 3 of the present invention.

[0024] Attached Figure 2 It is a schematic diagram of the top view of the structure when using embodiments 1 to 3 of the present invention.

[0025] Attached Figure 3 It is a schematic diagram of the front cross-sectional structure when using embodiments 1 to 3 of the present invention.

[0026] Attached Figure 4 It is a schematic diagram of the left-view structure when using embodiments 1 to 3 of the present invention.

[0027] Attached Figure 5 The three-dimensional structure of the embodiment 1 to the embodiment 3 of the present invention is shown in FIG. Figure 1 .

[0028] Attached Figure 6 The three-dimensional structure of the embodiment 1 to the embodiment 3 of the present invention is shown in FIG. Figure 2 .

[0029] Attached Figure 7 Schematic diagram of the three-dimensional structure of the sealed housing removed from the first to third embodiments of the present invention Figure 1 .

[0030] Attached Figure 8 Schematic diagram of the three-dimensional structure of the sealed housing removed from the first to third embodiments of the present invention Figure 2 .

[0031] Attached Fig. 9 For attachment Figure 1Schematic diagram of the three-dimensional enlarged structure of the middle left valve stem.

[0032] Attached Fig.10 For attachment Figure 1 Schematic diagram of the three-dimensional enlarged structure of the middle right valve stem.

[0033] Attached Fig.11 For attachment Figure 1 Schematic diagram of the three-dimensional structure when the left valve core and the right valve core are close to each other.

[0034] Attached Fig.12 For attachment Figure 1 Schematic diagram of the three-dimensional enlarged structure of the valve core on the left center.

[0035] Attached Fig.13 For attachment Figure 1 Schematic diagram of the enlarged cross-sectional view of the valve core on the left side of the middle.

[0036] Attached Fig.14 For attachment Figure 1 Schematic diagram of the three-dimensional enlarged structure of the valve core on the middle right.

[0037] Attached Fig.15 For attachment Figure 1 Schematic diagram of the top view and enlarged cross-section of the valve core on the middle right.

[0038] Attached Fig.16 For attachment Figure 1 Schematic diagram of the right-side cross-sectional enlarged structure of the middle left top plate.

[0039] Attached Fig.17 For attachment Figure 1 Schematic diagram of the enlarged structure of the left view section of the middle left top plate.

[0040] Attached Fig.18 Schematic diagram of the circuit structure of the fourth embodiment of the present invention.

[0041] Attached Fig.19 This is a schematic diagram of the main structure when using embodiments six to eight of the present invention.

[0042] Attached Fig. 20 It is a schematic diagram of the left-side structure when using embodiments six to eight of the present invention.

[0043] Attached Fig.21 It is a schematic diagram of the front cross-sectional structure when using embodiments 6 to 8 of the present invention.

[0044] Attached Fig. 22 The three-dimensional structure of the sixth to eighth embodiments of the present invention is shown in FIG. Figure 1 .

[0045] Attached Fig.23 The three-dimensional structure of the sixth to eighth embodiments of the present invention is shown in FIG. Figure 2 .

[0046] Attached Fig.24 It is a schematic diagram of the three-dimensional structure when the first drive motor and the reducer are removed according to embodiments 6 to 8 of the present invention.

[0047] Attached Fig.25 The three-dimensional structure of the sixth to eighth embodiments of the present invention when the reducer and the reduction box are removed Figure 1 .

[0048] Attached Fig.26 The three-dimensional structure of the sixth to eighth embodiments of the present invention when the reducer and the reduction box are removed Figure 2 .

[0049] Attached Fig. 27 It is a schematic diagram of the three-dimensional structure of the left valve stem in embodiments six to eight of the present invention.

[0050] Attached Fig.28 It is a schematic diagram of the enlarged right-side sectional structure of the connecting plate in Embodiments 6 to 8 of the present invention.

[0051] Attached Fig.29 This is a schematic diagram of the circuit structure of Embodiment 9 of the present invention.

[0052] Attached Fig.30 It is a schematic diagram of the three-dimensional structure of the self-tightening driven gear in the tenth embodiment of the present invention.

[0053] The codes in the accompanying drawings are: 1 is a sealing housing, 2 is a left valve core, 3 is a right valve core, 4 is a bare rod, 5 is a through hole, 6 is a guide groove, 7 is a right sealing groove, 8 is a left sealing groove, 9 is a guide portion, 10 is a bare rod sealing hole, 11 is a sealing packing, 12 is a compression sleeve, 13 is a packing gland, 14 is a left end cover, 15 is a right end cover, 16 is a left sealing sleeve, 17 is a right sealing sleeve, 18 is a left sealing packing, 19 is a right sealing packing, 20 is a left compression sleeve, 21 is a right pressing sleeve, 22 is a left sealing gland, 23 is a right sealing gland, 24 is a left driving motor, 25 is a right driving motor, 26 is a left mounting frame, 27 is a right mounting frame, 28 is a left push rod, 29 is a right push rod, 30 is a left top plate, 31 is a right top plate, 32 is a left top rod, 33 is a right top rod, 34 is a left removal section, 35 is a right removal section, 36 is a left limiting section, 37 is a right limiting section, 38 is a first limiting plate, 39 is a second limiting plate, 40 is The third limiting plate, 41 is the fourth limiting plate, 42 is the left limiting boss, 43 is the right limiting boss, 44 is the fixing seat, 45 is the reducer, 46 is the first driving motor, 47 is the left driving gear, 48 is the right driving gear, 49 is the reduction box, 50 is the driving bevel gear, 51 is the left driven bevel gear, 52 is the right driven bevel gear, 53 is the left output shaft, 54 is the right output shaft, 55 is the left driven gear, 56 is the right driven gear, 57 is the connecting plate, 58 is the connecting plate, is a pull rod, 59 is a disassembly section, 60 is a rotating section, 61 is a left limit ring platform, 62 is a right limit ring platform, 63 is a limit platform, 64 is a left connecting frame, 65 is a first travel switch, 66 is a second travel switch, 67 is a support plate, 68 is a second drive motor, 69 is an adjustment top screw, 70 is a self-tightening active gear, 71 is a left supporting step, 72 is a right supporting step, 73 is a transition step, 74 is a block, 75 is a retaining spring, and 76 is a self-tightening driven gear. DETAILED DESCRIPTION

[0054] The present invention is not limited by the following embodiments, and specific implementation methods can be determined based on the technical solution of the present invention and actual conditions.

[0055] In the present invention, for the convenience of description, the relative position relationship of each component is described according to the attached Figure 1 The layout is described in detail, such as the positional relationship of front, back, top, bottom, left, right, etc., which is based on the attached manual. Figure 1 The layout direction is determined by the

[0056] The present invention will be further described below in conjunction with embodiments and drawings:

[0057] Embodiment 1: As shown in the attached Figures 1 to 6As shown in , 11 to 15, the packing automatic sealing self-tightening system includes a left valve core 2, a right valve core 3, a first drive assembly, a sealing packing 11, a second drive assembly and a cross-shaped sealing housing 1, the upper end of the sealing housing 1 is provided with a through hole 5 for installing a light rod 4, the lower left end of the sealing housing 1 is provided with a left sealing hole whose right end is connected to the through hole 5, the left valve core 2 is installed in the left sealing hole, the lower right end of the sealing housing 1 corresponding to the position of the left sealing hole is provided with a right sealing hole whose left end is connected to the through hole 5, the right valve core 3 is installed in the right sealing hole, the left end of the right valve core 3 is provided with an arc-shaped guide groove 6 which passes through from top to bottom and opens to the left, the left part of the right valve core 3 is provided with a right sealing groove 7 which passes through from top to bottom and the left part is connected to the right part of the guide groove 6, the right end of the left valve core 2 is provided with a left sealing groove 8 which opens to the right and passes through from top to bottom, corresponding to the left sealing A guide portion 9 is fixedly installed on the right end of the left valve core 2 at the front and rear positions of the groove 8, and the outer side of the guide portion 9 matches the inner wall of the guide groove 6. A first driving assembly is provided on the outer side of the lower part of the sealing shell 1, which can make the left valve core 2 and the right valve core 3 approach or move away from each other. The left sealing groove 8, the guide portion 9 and the right sealing groove 7 can form a light rod sealing hole 10 that runs through the upper and lower parts, and the inner wall of the light rod sealing hole 10 can be in sealing contact with the outer side of the light rod 4. A sealing packing 11 is provided on the inner side of the upper part of the sealing shell 1, and a compression sleeve 12 is seated on the upper end of the sealing packing 11. A packing gland 13 that can press the compression sleeve 12 is screwed on the outer side of the upper end of the sealing shell 1, and a second driving assembly is provided on the outer side of the upper part of the sealing shell 1, which can make the packing gland 13 rotate and then press the sealing packing 11 through the compression sleeve 12.

[0058] According to the requirements, the inner side of the upper part of the penetration hole 5 has a conical surface which is larger at the top and smaller at the bottom, and the lower part of the sealing packing 11 is installed in the conical surface, so that when the compression sleeve 12 compresses the upper part of the sealing packing 11, the sealing packing 11 can be in sealing contact with the outer side of the polished rod 4. During use, the lower end of the sealing housing 1 is quickly installed together with the wellhead equipment, and the guide groove 6 is in an arc shape with an opening to the left, and the right part of the guide groove 6 is connected with the left part of the right sealing groove 7. In this way, when the polished rod 4 in the penetration hole 5 is not in the center, the right valve core 3 moves to the left, so that the eccentric polished rod 4 can move along the inner wall of the guide groove 6 into the right sealing groove 7, which can have a straightening effect on the eccentric polished rod 4, and then the guide part 9 moves to the right again to be in sealing contact with the guide groove 6, and finally the left sealing groove 8, the guide part 9 and the right sealing groove 7 are close to each other to form a cylindrical polished rod sealing hole 10 that runs through from top to bottom, and the outer side of the polished rod 4 is in sealing contact with the sealing groove 7. The inner wall of the sealing hole is in sealing contact, thereby achieving the effect of closing the penetration hole 5. When the sealing packing 11 on site is punctured and leaks, the second driving component works and compresses the sealing packing 11 through the compression sleeve 12 while the oil pumping unit is pumping continuously, so that the sealing packing 11 is in sealing contact with the outer side of the light rod 4, thereby preventing and stopping the sealing packing 11 from continuing to puncture and leak. It can replace the packing tightening operation of the on-site operators. When the light rod 4 leaks or a steam blowout occurs, the penetration hole 5 can be closed promptly and quickly through the first driving component and the second driving component, thereby ensuring the safe operation of the wellhead blowout preventer of the oil pumping unit and reducing the occurrence of wellhead pollution incidents.

[0059] The above packing automatic sealing and self-tightening system can be further optimized and / or improved according to actual needs:

[0060] Embodiment 2: As an optimization of the above embodiment, as shown in the attached Figures 1 to 8 As shown, a left end cover 14 is fixedly installed at the left end of the lower part of the sealing housing 1, and a left threaded hole is provided in the center of the left end cover 14, and a left valve stem whose right end is fixedly installed with the left valve core 2 is screwed in the left threaded hole, and the left end of the left valve stem is installed together with the corresponding position of the first drive assembly, and a left sealing sleeve 16 sleeved on the outer side of the left part of the left valve stem is fixedly installed on the left end of the left end cover 14, and a left sealing packing 18 is sleeved in the left sealing sleeve 16, and a left compression sleeve 20 is installed on the left end of the left sealing packing 18, and a left sealing gland 22 is screwed on the outer side of the left sealing sleeve 16, and the inner side of the left part of the left sealing gland 22 abuts against the left end of the left compression sleeve 20;

[0061] A right end cover 15 is fixedly installed on the right end of the lower right part of the sealing shell 1, and a right threaded hole is provided in the center of the right end cover 15, and a right valve stem whose left end is fixedly installed with the right valve core 3 is screwed in the right threaded hole, and the right end of the right valve stem is installed together with the corresponding position of the first drive assembly, and a right sealing sleeve 17 sleeved on the outer side of the right part of the right valve stem is fixedly installed on the right end of the right end cover 15, and a right sealing packing 19 is sleeved in the right sealing sleeve 17, and a right pressing sleeve 21 is installed on the right end of the right sealing packing 19, and a right sealing gland 23 is screwed on the outer side of the right sealing sleeve 17, and the inner side of the right part of the right sealing gland 23 abuts against the right end of the right pressing sleeve 21.

[0062] According to needs, an inner ring platform is provided on the inner side of the left end cover 14 and the inner side of the right end cover 15, and bearings or bushings are installed between the inner ring platform and the outer sides of the left valve stem and the right valve stem, so that the rotation of the left valve stem and the right valve stem is more flexible.

[0063] During use, when the first drive assembly drives the left valve stem and the right valve stem to rotate, under the action of the left threaded hole and the right threaded hole, the left valve stem and the right valve stem rotate and move closer to or away from each other. When leakage occurs between the left end cover 14 and the left valve stem, the left sealing gland 22 can be tightened, so that the left inner side of the left sealing gland 22 presses the left end of the left compression sleeve 20, so that the left compression sleeve 20 presses the left sealing packing 18, so that the left sealing packing 18 is in close contact with the outer side of the left valve stem, thereby avoiding further leakage between the left end cover 14 and the left valve stem. Similarly, when the right end cover 15 and the right valve stem are After leakage occurs, the right sealing cover 23 can be tightened, so that the inner side of the right part of the right sealing cover 23 presses the right end of the right compression sleeve 21, so that the right compression sleeve 21 presses the right sealing packing 19, so that the right sealing packing 19 is in close contact with the outer side of the right valve stem, thereby avoiding further leakage between the right end cover 15 and the right valve stem. In order to increase the contact area between the left sealing cover 22 and the left compression sleeve 20, and between the right sealing cover 23 and the right compression sleeve 21, the inner side of the left end of the left sealing cover 22 and the inner side of the right end of the right sealing cover 23 are provided with an inner ring platform, and the left end of the left compression sleeve 20 and the right end of the right compression sleeve 21 are provided with an outer ring platform.

[0064] Embodiment 3: As an optimization of the above embodiment, as shown in the attached Figures 1 to 8 As shown, the first drive assembly includes a left drive component and a right drive component, the left drive component includes a left drive motor 24 and a left mounting bracket 26, the left valve stem includes a left push rod 28, a left top plate 30 and a left push rod 32, the right outer portion of the left push rod 28 is screwed into the left threaded hole, a left mounting groove with an opening to the left is provided at the center of the left end of the left valve core 2, a left push rod 32 is installed in the left mounting groove, a left top plate 30 which is clamped together with the right end of the left push rod 28 is fixedly installed on the left end of the left push rod 32, a left mounting bracket 26 is fixedly installed on the left end of the left end cover 14, a left drive motor 24 is fixedly installed on the left end of the left mounting bracket 26, and the right end of the output shaft of the left drive motor 24 is drivingly connected with the left end of the left push rod 28;

[0065] The right drive assembly includes a right drive motor 25 and a right mounting frame 27. The right valve stem includes a right push rod 29, a right top plate 31 and a right push rod 33. The right outer side of the right part of the right push rod 29 is screwed into the right threaded hole. A right mounting groove opening to the right is provided in the center of the right end of the right valve core 3. The right push rod 33 is installed in the right mounting groove. The right end of the right push rod 33 is fixedly installed with a right top plate 31 clamped together with the left end of the right push rod 29. The right end of the right end cover 15 is fixedly installed with the right mounting frame 27. The right end of the right mounting frame 27 is fixedly installed with the right drive motor 25. The left end of the output shaft of the right drive motor 25 is transmission-connected to the right end of the right push rod 29.

[0066] According to the requirements, the left drive motor 24 and the right drive motor 25 are both existing well-known technologies, such as the servo motor of the 130 series. In order to reduce the weight of the left mounting frame 26, the left mounting frame 26 includes four screws and four pull rod sleeves. An outer ring platform is fixed to the outer side of the right end of the left end cover 14. The left end of the outer ring platform is provided with through holes corresponding to the base of the left drive motor 24 one by one. The right end of each screw passes through the mounting hole of the base of the left drive motor 24 and is screwed with a right connecting nut. The left end of each screw passes through the through hole at the corresponding position and is screwed with a left connecting nut. The outer side of each screw corresponding to the right end of the left drive motor 24 and the left end of the mounting ring platform is provided with a pull rod sleeve. The rod sleeve, the right end of the output shaft of the left drive motor 24 and the left end of the left push rod 28, as well as the left end of the output shaft of the right drive motor 25 and the right end of the right push rod 29 are all installed together through the existing well-known transmission sleeve transmission, the inner sides of the first ends of the two transmission sleeves are respectively key-connected with the outer sides of the right end of the output shaft of the left drive motor 24 and the left end of the output shaft of the right drive motor 25, the cross-section of the inner sides of the second ends of the two transmission sleeves is square, the outer sides of the left end of the left valve stem and the outer sides of the right end of the right valve stem are both squares that match the inner sides of the second ends of the transmission sleeves, and the outer sides of the left end of the left valve stem and the outer sides of the right end of the right valve stem are respectively inserted into the inner sides of the second ends of the transmission sleeves at corresponding positions.

[0067] Embodiment 4: As an optimization of the above embodiment, as shown in the attached Figures 1 to 6 As shown in Figures 1 and 18, the first drive assembly also includes a first control module, and the first control module is connected to the left drive motor 24 and the right drive motor 25 respectively.

[0068] According to the requirements, the first control module is an existing well-known programmable control module. The first control module can be fixedly installed in the control box of the utility pole. The first control module can also be connected to the monitoring center. In this way, the left drive motor 24 and the right drive motor 25 can be controlled by the first control module on site to realize the closing or opening of the left valve core 2 and the right valve core 3 on both sides of the light pole 4. The first control module can also be remotely controlled in the monitoring center to realize the closing or opening of the left valve core 2 and the right valve core 3 on both sides of the light pole 4. The servo motor is used to control the opening operation of the left valve core 2 and the right valve core 3, which can make the left valve core 2 and the right valve core 3 more precise. The closing action can be accurately achieved, and the time when the left valve core 2 and the right valve core 3 reach the polished rod 4 can also be achieved. When the polished rod 4 is not in the center of the penetration hole 5, the right valve core 3 contacts the outer side of the polished rod 4 before the left valve core 2. After the polished rod 4 contacts the inner wall of the guide groove 6, it moves to the right sealing groove 7 under the action of the arc-shaped inner wall of the guide groove 6, so that the polished rod 4 is located in the center of the penetration hole 5. The left valve core 2 moves to the left again, and the sealing effect on the outer side of the polished rod 4 can be achieved. When the left valve core 2 and the right valve core 3 fail, they can also be replaced with the polished rod 4 sealing valve core of the existing known gate blowout preventer, so that the two sealing valve cores are close to the outer side of the polished rod 4.

[0069] When the rod leaks or steam blowout occurs, timely and reliable control can be carried out to ensure the safe operation of the wellhead blowout preventer in unattended conditions and reduce the occurrence of wellhead pollution incidents.

[0070] The specific working process of this embodiment is as follows: when the left drive motor 24 and the right drive motor 25 receive an instruction from the first control module to close the valve, they will drive the left valve stem and the right valve stem to rotate. When the output shafts of the left drive motor 24 and the right drive motor 25 reach the set torque value, the left drive motor 24 and the right drive motor 25 stop rotating, thereby achieving the purpose of closing the valve cores on both sides of the light rod 4; when the left drive motor 24 and the right drive motor 25 receive an instruction from the first control module to open the valve, they will drive the left valve stem and the right valve stem to rotate in the opposite direction. When the output shafts of the left drive motor 24 and the right drive motor 25 reach the set number of turns, the left drive motor 24 and the right drive motor 25 stop rotating, thereby achieving the purpose of opening the valve cores on both sides of the light rod 4.

[0071] Embodiment 5: As an optimization of the above embodiment, this embodiment is a clamping method between the left push rod 28 and the left top plate 30 and the right push rod 29 and the right push rod 29, as shown in the attached Figures 1 to 10As shown in FIGS. 16 and 17 , a left card slot opening to the left is provided at the left end of the left top plate 30, and the left card slot includes a left take-out section 34 and a left limit section 36, the left take-out section 34 is in an arc shape opening downward, and the left limit section 36 is in a U shape opening upward, the lower part of the left take-out section 34 is connected with the upper part of the left limit section 36, and a first limit plate 38 rotatably mounted on the inner side of the lower part of the left limit section 36 is fixedly installed at the right end of the left push rod 28, a U-shaped left limit boss 42 opening upward is fixedly installed on the inner side of the left part of the left limit section 36 corresponding to the left side of the first limit plate 38, and a second annular limit plate 39 is fixedly installed on the outer side of the right part of the left push rod 28 corresponding to the position between the left limit boss 42 and the right side of the left end cover 14;

[0072] A right card slot opening to the right is provided at the right end of the right top plate 31, and the right card slot includes a right taking-out section 35 and a right limiting section 37. The right taking-out section 35 is in an arc shape opening downward, and the right limiting section 37 is in a U shape opening upward. The lower part of the right taking-out section 35 and the upper part of the right limiting section 37 are connected to each other, and a third limiting plate 40 rotatably mounted on the inner side of the lower part of the right limiting section 37 is fixedly installed on the left end of the right push rod 29, and a U-shaped right limiting boss 43 opening upward is fixedly installed on the inner side of the right part of the right limiting section 37 corresponding to the right side position of the third limiting plate 40, and a fourth annular limiting plate 41 is fixedly installed on the outer side of the left part of the right push rod 29 corresponding to the position between the right side of the right limiting boss 43 and the left side of the right end cover 15.

[0073] According to the requirements, the left extraction section 34 and the right extraction section 35 are both in the shape of an arc with the opening downward, and the first limit plate 38 and the third limit plate 40 are both circular. During use, the left push rod 28 can move left and right under the action of the left threaded hole when it rotates. By setting the left limit section 36, the right end of the left push rod 28 can drive the left top plate 30 to move left and right in the left limit section 36, thereby driving the left top rod 32 and the left valve core 2 to move left and right. The left valve stem is divided into sections, which can reduce the processing difficulty of the left valve stem and facilitate the installation between the left valve stem and the left valve core 2. By setting the left extraction section 34, after removing the left end cover 14, the left push rod 28 is moved upward so that the first limit plate 38 at the right end of the left push rod 28 is located in the left extraction section 34. The first limit plate 38 and the left limit boss 42 are separated from each other, and the first limit plate 38 is no longer constrained by the left limit boss 42. Then, the left push rod 28 is moved to the left to separate the left push rod 28 from the left top plate 30. The right end of the left push rod 28 is inserted into the left removal section 34, and then the left push rod 28 is moved downward so that the left limit boss 42 is stuck on the outside of the left push rod 28 between the first limit plate 38 and the second limit plate 39. Then, the left end cover 14 is fixedly installed together with the left end of the sealing shell 1 to realize the assembly of the left valve stem. Similarly, the assembly of the right valve stem can be realized.

[0074] When the output shaft of the left driving motor 24 rotates, the left push rod 28 is driven to rotate. When the left push rod 28 rotates, it moves to the right under the action of the left threaded hole, and the second limiting plate 39 presses the left side of the left limiting boss 42, thereby driving the left push rod 32 and the left valve core 2 to move to the right. Similarly, when the output shaft of the right driving motor 25 rotates, the right valve core 3 moves to the left, so that the left valve core 2 and the right valve core 3 can be close to each other and in sealing contact with the outer side of the light rod 4. When the output shaft of the left driving motor 24 rotates in the opposite direction, the left push rod 28 is driven to rotate in the opposite direction. When the left push rod 28 rotates in the opposite direction, it moves to the left under the action of the left threaded hole, and the first limiting plate 38 presses the right side of the left limiting boss 42, thereby driving the left push rod 32 and the left valve core 2 to move to the left. Similarly, when the output shaft of the right driving motor 25 rotates in the opposite direction, the right valve core 3 moves to the right, so that the left valve core 2 and the right valve core 3 can be moved away from the light rod 4.

[0075] Embodiment 6: As another optimization of the above embodiment 2, as shown in the attached Figures 19 to 27 As shown, the first drive assembly includes a fixed seat 44, a reducer 45, a first drive motor 46, a left driving gear 47 and a right driving gear 48. The fixed seat 44 is fixedly installed on the outer side of the lower part of the sealed housing 1, and the reducer 45 is fixedly installed on the front side of the fixed seat 44. The first drive motor 46 is fixedly installed on the front side of the reducer 45. The rear end of the output shaft of the first drive motor 46 is installed together with the input shaft of the reducer 45. The rear side of the reducer 45 is provided with a reduction box 49 fixedly installed in the fixed seat 44. The rear end of the output shaft of the reducer 45 passes through the front side of the reduction box 49 and is fixedly installed with a driving bevel gear 50. The left and right sides of the reduction box 49 are respectively provided with a left rotation hole and a right rotation hole. A left output shaft 53 is rotatably installed in the movable hole, a left driven bevel gear 51 meshing with the left portion of the driving bevel gear 50 is fixedly installed on the outer side of the right end of the left output shaft 53, a left driving gear 47 is fixedly installed on the outer side of the left end of the left output shaft 53, a left driven gear 55 meshing with the left portion of the left driving gear 47 is fixedly installed on the outer side of the left portion of the left valve stem, a right output shaft 54 ​​is rotatably installed in the right rotating hole, a right driven bevel gear 52 meshing with the right portion of the driving bevel gear 50 is fixedly installed on the outer side of the left end of the right output shaft 54, a right driving gear 48 is fixedly installed on the outer side of the right end of the right output shaft 54, and a right driven gear 56 meshing with the right portion of the right driving gear 48 is fixedly installed on the outer side of the right portion of the right valve stem.

[0076] According to the requirements, the first drive motor 46 is an existing well-known technology, such as a servo motor of the 130 series. According to the torque required for closing the valve core of the light rod 4, a motor with a power of 1.0-1.5KW and a torque greater than 5Nm is selected for matching. The electronic gear ratio of the servo motor driver can be set to 5:3, and it works in a speed control mode. The motor speed can be set at 2000 rpm. The reducer 45 can be an existing well-known ZE120 servo-specific planetary reducer. The input end flange is convenient for transmission connection with the output shaft of the first drive motor 46, and the output end is a light axis.

[0077] In order to reduce the weight of the fixed seat 44, the fixed seat 44 includes two fixed clamps, which can be made of steel plates with a thickness of 3 mm. The front parts of the two fixed clamps are respectively mounted on the left outer side and the right outer side of the reduction box 49, and the rear parts of the two fixed clamps are respectively mounted on the left outer side and the right outer side of the sealing shell 1. The two fixed clamps are fixed together by a number of studs distributed at intervals along the circumference and nuts screwed to the left and right outer sides of the studs. A limiting sleeve is mounted on the outer side of the studs corresponding to the position between the two fixed clamps. In order to prevent the fixed clamps from moving left and right, limiting steps are provided on the outer side of the sealing shell 1 on the right side of the left fixed clamp and on the left side of the right fixed clamp, or limiting blocks are mounted on the upper and lower outer sides of the sealing shell 1, and the left and right sides of the limiting blocks are parallel to each other.

[0078] The outer side of the left part of the left valve stem corresponding to the left position of the left sealing cover 22 and the left driven gear 55 are connected through a key transmission, and the outer side of the left valve stem corresponding to the left end and right end of the left driven gear 55 are installed with retaining springs, and the installation method between the right valve stem and the right driven gear 56 is the same as the installation method between the left driven gear 55 and the left valve stem.

[0079] The first drive motor 46 can achieve power output by reducing speed and increasing torque through a reduction mechanism, and realizes the double-axis counter-rotation of the left output shaft 53 and the right output shaft 54 ​​through the active bevel gear 50, the left driven bevel gear 51 and the right driven bevel gear 52. The left valve stem and the right valve stem are respectively driven to rotate through the left active gear 47, the left driven gear 55 and the right active gear 48 and the right driven gear 56. The left valve stem and the right valve stem have the same structure and are symmetrically arranged, so that the rotation directions of the left valve stem and the right valve stem are opposite, but the feeding directions of the left valve stem and the right valve stem are approaching or moving away from each other. By controlling the rotation of the first drive motor 46, the left valve core 2 and the right valve core 3 can be sealed and contacted with the outer side of the light rod 4 after approaching each other, or can be separated from the light rod 4 after moving away from each other.

[0080] Embodiment 7: As an optimization of the above embodiment, as shown in the attached Figures 19 to 28As shown, the left valve stem includes a connecting plate 57 and a pull rod 58. The right outer side of the pull rod 58 is screwed into the left threaded hole. A circular connecting plate 57 is fixedly installed on the left end of the left valve core 2. A connecting groove opening to the left is provided on the left end of the connecting plate 57. The connecting groove includes a disassembly section 59 and a rotation section 60. The disassembly section 59 is in an arc shape with an opening downward, and the rotation section 60 is in a U shape with an opening upward. The lower part of the disassembly section 59 is connected to the upper part of the rotation section 60. A rotation installation is fixed on the right outer side of the pull rod 58. A right limiting ring platform 62 is installed on the inner side of the lower part of the rotating section 60, and a U-shaped limiting ring platform 63 with an opening facing upward is fixed on the inner side of the left part of the rotating section 60 corresponding to the left end position of the right limiting ring platform 62. An annular left limiting ring platform 61 is fixedly installed on the outer side of the right part of the pull rod 58 between the left side of the limiting ring platform 63 and the right side of the left end cover 14. The left driven gear 55 is fixedly installed on the outer side of the left part of the pull rod 58 on the left side of the left sealing cover 22. The right valve stem has the same structure as the left valve stem and is symmetrically arranged.

[0081] According to the requirements, the disassembly section 59 is in an arc shape with the opening downward. During use, the pull rod 58 can move left and right under the action of the left threaded hole when rotating. By setting the rotating section 60, the right end of the pull rod 58 can drive the connecting plate 57 to move left and right in the rotating section 60, thereby driving the left valve core 2 to move left and right. In order to increase the connection strength between the connecting plate 57 and the left valve core 2, a connecting groove is provided at the left end of the left valve core 2, and a connecting column is provided in the connecting groove to fix the left end and the right end of the connecting plate 57 together. The left valve stem is divided into sections, which can reduce the processing difficulty of the left valve stem and facilitate the installation between the left valve stem and the left valve core 2. By setting the disassembly section 59, after removing the left end cover 14, the pull rod 5 is moved upward. 8, so that the right limit ring 62 at the right end of the pull rod 58 is located in the disassembly section 59, so that the right limit ring 62 and the limit platform 63 are separated from each other, and the right limit ring 62 is no longer constrained by the limit platform 63, and then the pull rod 58 is moved to the left, so that the pull rod 58 and the connecting plate 57 can be separated from each other, and the right end of the pull rod 58 is inserted into the disassembly section 59, and then the pull rod 58 is moved downward, so that the limit platform 63 is stuck on the outside of the pull rod 58 between the left limit ring 61 and the right limit ring 62, and then the left end cover 14 is fixedly installed together with the left end of the sealing shell 1 to realize the assembly of the left valve stem, and the assembly of the right valve stem is realized in the same way.

[0082] When the first drive motor 46 is working, it drives the right valve stem and the left valve stem to rotate. The first drive motor 46 drives the pull rod 58 to rotate. When the pull rod 58 rotates, it moves to the right under the action of the left threaded hole, and the left limit ring 61 presses the left side of the limit platform 63, thereby driving the connecting plate 57 and the left valve core 2 to move to the right. Similarly, the right valve core 3 moves to the left, so that the left valve core 2 and the right valve core 3 can be close to each other and in sealing contact with the outer side of the light rod 4. When the first drive motor 46 drives the right valve stem and the left valve stem to rotate in the opposite direction, the first drive motor 46 drives the pull rod 58 to rotate in the opposite direction. When the pull rod 58 rotates in the opposite direction, it moves to the left under the action of the left threaded hole, and the right limit ring 62 presses the right side of the limit platform 63, thereby driving the connecting plate 57 and the left valve core 2 to move to the left. Similarly, the right valve core 3 moves to the right, so that the left valve core 2 and the right valve core 3 can be moved away from the light rod 4.

[0083] Embodiment 8: As an optimization of the above embodiment, as shown in the attached Figures 19 to 24 As shown, the difference between the tooth width of the left driving gear 47 and the tooth width of the left driven gear 55 is not less than 15 mm, and the difference between the tooth width of the right driving gear 48 and the tooth width of the right driven gear 56 is not less than 15 mm. The inner wall of the guide groove 6 can contact the outer side of the light rod 4 before the guide portion 9.

[0084] The power of the reducer 45 is transmitted through the left output shaft 53 and the right output shaft 54, and the left output shaft 53 and the right output shaft 54 ​​are respectively connected to the left valve stem and the right valve stem through a gear pair.

[0085] During the oil well production process, the polished rod 4 cannot be kept at the center of the penetration hole 5. When the deviation is large, the transmission ratio between the left valve stem and the left output shaft 53 is 1.25:1, the gear ratio between the left driving gear 47 and the left driven gear 55 is 1:1.25, the transmission ratio between the right valve stem and the right output shaft 54 ​​is 1.5:1, and the gear ratio between the right driving gear 48 and the right driven gear 56 is 1:1.5. In this way, when the rotation speeds of the left output shaft 53 and the right output shaft 54 ​​are the same, the rotation speeds of the left valve stem and the right valve stem are different. Since the transmission ratio between the right output shaft 54 ​​and the right valve stem is 1.5:1, and the transmission ratio between the left output shaft 53 and the left valve stem is 1.25:1, the rotation speed of the right valve stem is slower than that of the left valve stem.

[0086] When the left valve core 2 and the right valve core 3 are close to each other to close the penetration hole 5, the length of the right valve core 3 is 102mm, the distance between the left end of the left valve core 2 and the right end of the guide part 9 is 96mm, the distance between the right end of the guide part 9 and the light rod 4 is greater than the distance between the left end of the right valve core 3 and the light rod 4, the guide groove 6 will approach the light rod 4 before the guide part 9. At this time, if the light rod 4 is not in the center position of the penetration hole 5, the eccentric light rod 4 will pass through the inner wall of the guide groove 6 and move to the inner side of the right part of the right sealing groove 7, so that the light rod 4 is located in the center of the penetration hole 5. The left valve stem rotates quickly. Although the left valve core 2 is far away from the light rod 4, it moves toward the light rod 4 quickly. Finally, the eccentric light rod 4 can be tightly embraced by the successive movement of the left valve core 2 and the right valve core 3, so that the light rod 4 is located in the center of the penetration hole 5. When the light rod 4 needs to be loosened, the left valve stem rotates quickly, the guide part 9 will move away from the contact surface of the light rod 4 before the guide groove 6, and the guide groove 6 then leaves the contact surface of the light rod 4.

[0087] Since the diameter of the polished rod 4 is 25 mm and the central diameter of the through hole 5 is 52 mm, the moving distance of the left valve stem and the right valve stem is about 13.5 mm. When the left valve core 2 and the right valve core 3 are worn (leakage occurs after the left valve core 2 and the right valve core 3 contact the outer side of the polished rod 4), it is necessary to increase the moving distance of the left valve core 2 and the right valve core 3. Therefore, the tooth width of the left driving gear 47 and the right driving gear 48 can be set to 60 mm, and the tooth width of the left driven gear 55 and the right driven gear 56 can be set to 15 mm. In this way, the maximum adjustment distance of the left driven gear 55 and the right driven gear 56 moving left and right during the rotation process can be 30 mm, which can meet the requirement that the outer side of the polished rod 4 can still be sealed when leakage occurs later.

[0088] Embodiment 9: As an optimization of the above embodiment, as shown in the attached Figures 19 to 24 As shown in Figures 29, the drive mechanism also includes a second control module. A left connecting frame 64 is fixedly installed on the left end of the left end cover 14. A first travel switch 65 and a second travel switch 66 are fixedly installed in the left connecting frame 64 corresponding to the left and right positions of the left driving gear 47, respectively. The first travel switch 65 and the second travel switch 66 are both connected to the second control module, and the second control module is connected to the first drive motor 46.

[0089] According to the requirements, the first travel switch 65 and the second travel switch 66 are both existing well-known travel switches, such as the model LXW5-11D1 micro switch, the second control module is an existing well-known programmable controller, and the second control module can be fixedly installed in the control box of the electric pole. The left end cover 14 and the left end of the sealing shell 1 are fixedly installed together by a plurality of connecting bolts distributed along the circumference. In order to improve the sealing performance between the left end cover 14 and the left end face of the sealing shell 1, a sealing gasket is provided between the right end of the left end cover 14 and the left end of the sealing shell 1. In order to facilitate the disassembly and assembly of the left driven gear 55, the left connecting frame 64 is Z-shaped with the left portion located above the left driven gear 55. The upper part of the first travel switch 65 is fixedly installed with the left end of the left connecting frame 64 by connecting screws, and the right end of the left connecting frame 64 is provided with connecting holes that pass through the left and right sides, so that the left connecting frame 64, the left end cover 14 and the sealing shell 1 can be fixedly installed together by using one of the connecting bolts between the left end cover 14 and the left end surface of the sealing shell 1. If it is necessary to remove the left driven gear 55, it is only necessary to loosen the connecting screws between the first travel switch 65 and the left connecting frame 64, rotate the left part of the left connecting frame 64, so that the first travel switch 65 is located at the upper left of the left driven gear 55, or remove the first travel switch 65 to carry out the disassembly operation of the left driven gear 55.

[0090] The first stroke switch 65 and the second stroke switch 66 are fixedly installed on the inner side of the left part of the left connecting frame 64. In order to facilitate the adjustment of the position of the second stroke switch 66, an adjusting screw hole can be set on the right part of the left connecting frame 64, and the connecting screw of the second stroke switch 66 is screwed into the adjusting screw hole. In this way, the position of the second stroke switch 66 can be adjusted by rotating the connecting screw, and the adjustment is more convenient. In order to fix the second stroke switch 66, a locking nut can be screwed on the outer side of the connecting screw at the right part of the left connecting frame 64.

[0091] Handles are fixedly installed on the outer side of the left end of the pull rod 58 and the outer side of the right end of the right valve stem. In this way, when a power outage or an unexpected failure occurs, the left driven gear 55 and the left driving gear 47, the right driven gear 56 and the right driving gear 48 are separated from each other, and the left valve core 2 and the right valve core 3 can be moved closer to or away from each other by turning the handle.

[0092] When the left valve core 2 and the right valve core 3 are close to each other to close the penetration hole 5, the length of the right valve core 3 is 96mm, the distance between the left end of the left valve core 2 and the right end of the guide part 9 is 102mm, the distance between the right end of the guide part 9 and the light rod 4 is greater than the distance between the left end of the right valve core 3 and the light rod 4, the guide groove 6 will approach the light rod 4 before the guide part 9. At this time, if the light rod 4 is not in the center position of the penetration hole 5, the eccentric light rod 4 will pass through the inner wall of the guide groove 6 and move to the inner side of the right part of the right sealing groove 7, so that the light rod 4 is located in the center of the penetration hole 5. The left valve stem rotates quickly. Although the left valve core 2 is far away from the light rod 4, it moves toward the light rod 4 quickly. Finally, the eccentric light rod 4 can be tightly embraced by the successive movement of the left valve core 2 and the right valve core 3, so that the light rod 4 is located in the center of the penetration hole 5. When the left driven gear 55 touches the contact of the second stroke switch 66, the second control module receives the feedback signal and issues an instruction at the same time to stop the first drive motor 46.

[0093] When it is necessary to release the light rod 4, the left valve stem rotates faster, and the guide part 9 will move away from the contact surface of the light rod 4 before the guide groove 6, and the guide groove 6 will then leave the contact surface of the light rod 4. When the left driven gear 55 touches the contact of the second travel switch 66, the second control module receives the feedback signal and issues an instruction at the same time, the first drive motor 46 stops rotating, the left connecting frame 64 can also be installed on the right end cover 15, and the first travel switch 65 and the second travel switch 66 can also be triggered by the right driven gear 56.

[0094] Initially, the distance between the first stroke switch 65 and the second stroke switch 66 is 15 mm. When the left valve core 2 and the right valve core 3 are worn (leakage occurs after the left valve core 2 and the right valve core 3 contact the outer side of the light rod 4), it is necessary to increase the moving distance of the left valve core 2 and the right valve core 3. The stroke setting can be increased, and the distance between the first stroke switch 65 and the second stroke switch 66 can be adjusted (the position of the second stroke switch 66 can be adjusted left and right on the left connecting frame 64), so that the maximum adjustment distance of the left driven gear 55 and the right driven gear 56 moving left and right during the rotation process can be 30 mm, which can meet the requirement of being able to seal the outer side of the light rod 4 when leakage occurs later.

[0095] The second control module can also be connected to the monitoring center, so that the first drive motor 46 can be controlled by the second control module on site to realize the closing or opening of the left valve core 2 and the right valve core 3 on both sides of the light rod 4, and the second control module can be remotely controlled at the monitoring center to realize the closing or opening of the left valve core 2 and the right valve core 3 on both sides of the light rod 4. The servo motor is used to control the opening operation of the left valve core 2 and the right valve core 3, which can make the left valve core 2 and the right valve core 3 realize the closing action more accurately. When the light rod 4 leaks or steam blowout occurs, timely and reliable control can be carried out to ensure the safe operation of the wellhead blowout preventer of the pumping unit in an unattended situation and reduce the occurrence of wellhead pollution incidents.

[0096] The specific working process of this embodiment is as follows: when the first drive motor 46 receives the instruction from the second control module to close the valve, the output shaft of the first drive motor 46 rotates, and the speed is reduced and the torque is increased through the reducer 45. The output shaft of the reducer 45 drives the left output shaft 53 and the right output shaft 54 ​​to rotate respectively through the driving bevel gear 50, the left driven bevel gear 51 and the right driven bevel gear 52. The left output shaft 53 rotates clockwise, driving the left driving gear 47 to rotate clockwise, thereby driving the left driven gear 55 to rotate so that the left valve core 2 moves to the right and closes the left part of the penetration hole 5. At the same time, the right output shaft 54 ​​rotates counterclockwise, driving the right driving gear 48 to rotate counterclockwise, thereby driving the right driven gear 56 to rotate so that the right valve core 3 moves to the left and closes the right part of the penetration hole 5. When the left driven gear 55 moves to the right and triggers the second stroke switch 66, the left valve core 2 and the right valve core 3 completely close the penetration hole 5.

[0097] When the first drive motor 46 receives the instruction from the second control module to open the valve, the output shaft direction of the first drive motor 46 rotates, and the output shaft of the reducer 45 drives the left output shaft 53 and the right output shaft 54 ​​to rotate respectively through the active bevel gear 50, the left driven bevel gear 51 and the right driven bevel gear 52. The left output shaft 53 rotates counterclockwise, driving the left active gear 47 to rotate counterclockwise, thereby driving the left driven gear 55 to rotate so that the left valve core 2 moves to the left to open the left part of the penetration hole 5. At the same time, the right output shaft 54 ​​rotates clockwise, driving the right active gear 48 to rotate clockwise, thereby driving the right driven gear 56 to rotate so that the right valve core 3 moves to the right to open the right part of the penetration hole 5. When the left driven gear 55 moves to the right to trigger the first travel switch 65, the left valve core 2 and the right valve core 3 completely open the penetration hole 5.

[0098] When manual operation is required, the left driven gear 55 and the right driven gear 56 are removed, or the left driven gear 55 and the left driving gear 47, and the right driven gear 56 and the right driving gear 48 are separated from each other. Turning the handle can make the left valve core 2 and the right valve core 3 approach each other to close the penetration hole 5 or move away from each other to open the penetration hole 5.

[0099] Embodiment 10: As an optimization of the above embodiment, as shown in the attached Figures 1 to 8, 19 to 26, 30, the second drive assembly includes a support plate 67, a second drive motor 68, an adjusting screw 69 and a self-tightening driving gear 70, and the left and right outer sides of the sealing housing 1 corresponding to the position below the packing gland 13 are provided with symmetrically distributed left support steps 71 and right support steps 72, and the upper front side of the support plate 67 is provided with a mounting hole that passes through from top to bottom, and the left inner wall and the right inner wall of the mounting hole are both vertical surfaces, and the distance between the left inner wall and the right inner wall of the mounting hole is the same as the distance between the vertical surfaces of the left support step 71 and the right support step 72, and the support plate 67 Sealed on the left supporting step 71 and the right supporting step 72, the front side of the support plate 67 is provided with an adjusting screw hole that passes through the front and rear, and the front side of the sealing shell 1 corresponding to the position of the adjusting screw hole is provided with a limiting screw hole, and an adjusting top screw 69 is threaded in the adjusting screw hole and threaded in the limiting screw hole on the rear outer side, and a second drive motor 68 is fixedly installed on the lower rear side of the support plate 67, and a self-tightening driving gear 70 is fixedly installed on the output shaft of the second drive motor 68 after passing through the upper side of the support plate 67, and a self-tightening driven gear 76 that meshes with the upper outer side of the self-tightening driving gear 70 is detachably fixedly installed on the outer side of the lower part of the packing gland 13.

[0100] According to the needs, a vent hole connected inside and outside is provided on the upper rear side of the sealed shell 1 corresponding to the position below the second drive motor 68. A hollow vent nozzle is fixedly installed in the vent hole, and a vent plug is screwed on the inner side of the rear of the vent nozzle. The second drive motor 68 is an existing well-known technology, such as a micro DC motor with model number 90DC.

[0101] The outer side of the upper part of the packing gland 13 is four-sided, and a transition step 73 is formed between the four-sided surface and the cylindrical surface on the outer side of the lower part of the packing gland 13. A clamping block 74 seated on the transition step 73 is fixed to the inner side of the self-tightening driven gear 76, and a clamping groove is provided on the four sides corresponding to the position above the self-tightening driven gear 76. A retaining spring 75 close to the upper end of the self-tightening driven gear 76 is installed in the clamping groove. This makes it easier to disassemble and assemble the self-tightening driven gear 76. When the sealing packing 11 needs to be replaced, it is only necessary to disassemble the packing gland 13 and the self-tightening driven gear 76, thereby reducing the difficulty of replacing the sealing packing 11.

[0102] When the sealing packing 11 is worn to the point where it cannot meet the wellhead sealing requirements, the sealing packing 11 is replaced. First, remove the retaining spring 75, pull the self-tightening driven gear 76 upward from the outside of the packing gland 13, and disengage it from the self-tightening driving gear 70. Then, hang the self-tightening driven gear 76 on a rope hanger or a bare rod 4, disassemble the packing gland 13, remove the compression sleeve 12, and replace the sealing packing 11. After the operation is completed, tighten the packing gland 13, insert the self-tightening driven gear 76 downward into the packing gland 13, and seat it on the transition step 73. Use the retaining spring 75 to position it, and restore the cooperation between the self-tightening driving gear 70 and the self-tightening driven gear 76.

[0103] The support plate 67 can also be moved backward relative to the left support step 71 and the right support step 72 by rotating the adjusting screw 69, so that the self-tightening driving gear 70 and the self-tightening driven gear 76 are out of meshing state, and then the self-tightening driven gear 76 and the packing gland 13 are removed from the outside of the sealing housing 1, and the compression sleeve 12 is removed to replace the sealing packing 11. After the operation is completed, the packing gland 13 is tightened, the self-tightening driven gear 76 and the packing gland 13 are fixed together, and then the packing gland 13 and the sealing housing 1 are screwed together. When the self-tightening driven gear 76 moves to correspond to the self-tightening driving gear 70, the support plate 67 is moved forward relative to the left support step 71 and the right support step 72 by rotating the adjusting screw 69, and finally the meshing relationship between the self-tightening driving gear 70 and the self-tightening driven gear 76 is restored.

[0104] When assembling the self-tightening driving gear 70 and the self-tightening driven gear 76, tighten the adjusting screw 69 to make the support plate 67 move backward relative to the left support step 71 and the right support step 72, so that a certain distance is maintained between the rear side of the self-tightening driving gear 70 and the sealing housing 1 to facilitate the installation of the packing gland 13 and the self-tightening driven gear 76. Then, after the self-tightening driven gear 76 and the packing gland 13 are installed, they are screwed to the outside of the sealing housing 1, and the packing gland 13 is rotated to make the packing gland 13 and the self-tightening driven gear 76 move downward until the self-tightening driven gear 70 is in a state of being locked. The lower end surface of the movable gear 76 is located below the upper end surface of the self-tightening driving gear 70, and then the adjusting top screw 69 is loosened to make the support plate 67 move forward relative to the left support step 71 and the right support step 72 until the self-tightening driving gear 70 and the self-tightening driven gear 76 are fully engaged. At this time, the head of the adjusting top screw 69 presses against the front side surface of the support plate 67, and the stud end of the adjusting top screw 69 is screwed into the locking screw hole, the rear side of the sealing shell 1 and the rear inner wall of the mounting hole are in contact, and the distance between the front inner wall of the mounting hole and the front side of the sealing shell 1 is the largest.

[0105] In order to increase the stability between the support plate 67 and the sealing shell 1, symmetrical front supporting steps and rear supporting steps are provided on the upper front side and upper rear side of the sealing shell 1 corresponding to the position between the left supporting step 71 and the right supporting step 72, that is, the outer contour surface of the upper outer side of the sealing shell 1 is square, the mounting hole is rectangular, the width of the mounting hole is the same as the distance between the vertical surfaces of the left supporting step 71 and the right supporting step 72, the length of the mounting hole is greater than the distance between the vertical surfaces of the front supporting step and the vertical surfaces of the rear supporting step, and the limiting screw hole is provided on the vertical surface of the front supporting step.

[0106] The distance between the vertical surfaces of the front supporting step and the rear supporting step is smaller than the length of the mounting hole, and the difference between the length of the mounting hole (the distance between the front side surface and the rear side surface) and the distance between the vertical surfaces of the front supporting step and the rear supporting step is 10 to 20 mm.

[0107] The tooth width of the self-tightening driven gear 76 is 10 to 20 mm, and the sum of the stroke height and the tooth width of the self-tightening driven gear 76 is less than the tooth width of the self-tightening driving gear 70. The tooth width of the self-tightening driving gear 70 can be 60 mm, and the tooth width of the self-tightening driven gear 76 can be 15 mm. The stroke height of the operation of the tight sealing packing 11 is 28 mm, that is, the stroke height of the self-tightening driven gear 76 is 28 mm.

[0108] The second drive motor 68 is installed on the sealing housing 1 through the support plate 67. The output shaft of the second drive motor 68 is parallel to the polished rod 4 and maintains a certain distance from the polished rod 4, so that the self-tightening driving gear 70 installed on the output shaft of the second drive motor 68 and the self-tightening driven gear 76 installed on the packing gland 13 are parallel shafts and transmit in the same direction to realize the control of the operation of the tight sealing packing 11. The self-tightening driven gear 76 is installed at the bottom of the packing gland 13. When the sealing packing 11 is full, the self-tightening driven gear 76 is meshed with the upper part of the self-tightening driving gear 70. When the sealing packing 11 is empty, the self-tightening driven gear 76 is meshed with the lower part of the self-tightening driving gear 70.

[0109] In order to facilitate automatic control of the second drive motor 68, the second drive motor 68 is connected to the first control module or the second control module. The power supply of the first control module and the second control module can adopt the existing well-known power grid power supply or solar cell power supply system. The solar cell power supply system can be installed at an appropriate position near the wellhead sealing shell 1 to realize independent power supply. The average daily packing tightening operation times of a single well in the well area can be counted to meet the power supply in winter and when there is insufficient light. It is green and energy-saving and easy to install. The device can automatically tighten the wellhead packing without stopping the pumping unit, and can also perform remote control to tighten the wellhead packing to prevent and stop the packing from continuing to leak, thereby improving the safety and efficiency of the wellhead seal during oil production.

[0110] When the sealing packing 11 on site is punctured and leaked, the second drive motor 68 can tighten the sealing packing 11 after it starts working while the pumping unit is still pumping, thereby preventing and stopping the sealing packing 11 from continuing to puncture and leak. It can replace the packing tightening operation of on-site operators and is suitable for wellhead sealing under various working conditions. It improves the safety and efficiency of wellhead sealing during oil production, can be promoted and used in domestic and foreign oil fields, and has good development prospects.

[0111] The above technical features respectively constitute various embodiments of the present invention, which have strong adaptability and implementation effect. Non-essential technical features can be added or reduced according to actual needs to meet the requirements of different situations.

Claims

1. A packing automatic sealing and self-tightening system, characterized in that The valve body comprises a left valve core, a right valve core, a first drive assembly, a sealing packing, a second drive assembly and a cross-shaped sealing housing, wherein the upper end of the sealing housing is provided with a through hole for installing a light rod, the lower left end of the sealing housing is provided with a left sealing hole whose right end is connected with the through hole, the left valve core is installed in the left sealing hole, the lower right end of the sealing housing corresponding to the position of the left sealing hole is provided with a right sealing hole whose left end is connected with the through hole, the right valve core is installed in the right sealing hole, the left end of the right valve core is provided with an arc-shaped guide groove which is connected vertically and opens to the left, the left part of the right valve core is provided with a right sealing groove which is connected vertically and connected with the right part of the guide groove, the right end of the left valve core is provided with a left sealing groove which opens to the right and is connected vertically, and the left sealing groove corresponding to the front side of the left sealing groove A guide portion is fixedly installed at the right end of the left valve core at the rear position, the outer side of the guide portion matches the inner wall of the guide groove, a first driving assembly is provided on the outer side of the lower part of the sealing shell, which can make the left valve core and the right valve core approach or move away from each other, the left sealing groove, the guide portion and the right sealing groove can form a polished rod sealing hole that passes through from top to bottom, the inner wall of the polished rod sealing hole can be in sealing contact with the outer side of the polished rod, a sealing packing is provided on the inner side of the upper part of the sealing shell, a compression sleeve is seated on the upper end of the sealing packing, a packing gland that can press the compression sleeve is screwed on the outer side of the upper end of the sealing shell, and a second driving assembly that can press the sealing packing through the compression sleeve after the packing gland rotates is provided on the outer side of the upper part of the sealing shell; The inner wall of the guide groove can contact the outer side of the polished rod before the guide portion; A left end cover is fixedly installed at the left end of the lower part of the sealing housing, a left threaded hole is provided in the center of the left end cover, a left valve stem whose right end is fixedly installed with the left valve core is threadedly connected in the left threaded hole, the left end of the left valve stem is installed together with the corresponding position of the first driving assembly, a left sealing sleeve sleeved on the outer side of the left part of the left valve stem is fixedly installed on the left end of the left end cover, a left sealing packing is sleeved in the left sealing sleeve, a left compression sleeve is installed on the left end of the left sealing packing, a left sealing gland is threadedly connected to the outer side of the left sealing sleeve, and the inner side of the left part of the left sealing gland abuts against the left end of the left compression sleeve; A right end cover is fixedly installed at the right end of the lower part of the sealing housing, a right threaded hole is provided in the center of the right end cover, a right valve stem whose left end is fixedly installed with the right valve core is threadedly connected in the right threaded hole, the right end of the right valve stem is installed together with the corresponding position of the first driving assembly, a right sealing sleeve sleeved on the outer side of the right part of the right valve stem is fixedly installed on the right end of the right end cover, a right sealing packing is sleeved in the right sealing sleeve, a right pressing sleeve is installed on the right end of the right sealing packing, a right sealing gland is threadedly connected to the outer side of the right sealing sleeve, and the inner side of the right part of the right sealing gland abuts against the right end of the right pressing sleeve; The second driving assembly includes a support plate, a second driving motor, an adjusting screw and a self-tightening driving gear. A symmetrically distributed left supporting step and a right supporting step are provided on the outer side of the left and right parts of the sealing shell corresponding to the position below the packing gland. A mounting hole that passes through from top to bottom is provided on the upper side of the front of the support plate. The support plate is seated on the left supporting step and the right supporting step. An adjusting screw hole that passes through from front to back is provided on the front side of the support plate. A limiting screw hole is provided on the front side of the sealing shell corresponding to the position of the adjusting screw hole. An adjusting screw screw that is screwed on the outer side of the rear part is screwed in the limiting screw hole. A second driving motor is fixedly installed on the lower side of the rear of the support plate. The output shaft of the second driving motor passes through the upper side of the support plate and is fixedly installed with a self-tightening driving gear. A self-tightening driven gear that meshes with the outer side of the upper part of the self-tightening driving gear is detachably fixedly installed on the outer side of the lower part of the packing gland. A clamping groove is arranged on the outer side of the upper part of the packing gland corresponding to the upper position of the self-tightening driven gear, and a clamping spring close to the upper end of the self-tightening driven gear is installed in the clamping groove.

2. The packing automatic sealing and self-tightening system according to claim 1 is characterized in that The first drive assembly includes a left drive component and a right drive component, the left drive component includes a left drive motor and a left mounting frame, the left valve stem includes a left push rod, a left top plate and a left push rod, the right outer portion of the left push rod is screwed into the left threaded hole, a left mounting groove with an opening to the left is provided at the center of the left end of the left valve core, a left push rod is installed in the left mounting groove, a left top plate fixedly installed at the left end of the left push rod and clamped together with the right end of the left push rod, a left mounting frame fixedly installed at the left end of the left end cover, a left drive motor fixedly installed at the left end of the left mounting frame, and the right end of the output shaft of the left drive motor is transmission-connected with the left end of the left push rod; The right drive assembly includes a right drive motor and a right mounting frame, the right valve stem includes a right push rod, a right top plate and a right push rod, the right outer side of the right part of the right push rod is screwed into the right threaded hole, a right mounting groove opening to the right is provided in the center of the right end of the right valve core, the right push rod is installed in the right mounting groove, the right end of the right push rod is fixedly installed with a right top plate clamped together with the left end of the right push rod, the right end of the right end cover is fixedly installed with a right mounting frame, the right end of the right mounting frame is fixedly installed with a right drive motor, and the left end of the output shaft of the right drive motor is transmission-connected with the right end of the right push rod.

3. The packing automatic sealing and self-tightening system according to claim 2 is characterized in that The first driving assembly also includes a first control module, and the first control module is connected to the left driving motor and the right driving motor respectively.

4. The packing automatic sealing and self-tightening system according to claim 2 or 3, characterized in that A left card slot opening to the left is provided at the left end of the left top plate, the left card slot includes a left taking-out section and a left limiting section, the left taking-out section is in an arc shape opening downward, the left limiting section is in a U shape opening upward, the lower part of the left taking-out section is connected to the upper part of the left limiting section, a first limiting plate rotatably mounted on the inner side of the lower part of the left limiting section is fixedly installed on the right end of the left push rod, a U-shaped left limiting boss opening upward is fixedly installed on the inner side of the left part of the left limiting section corresponding to the left side position of the first limiting plate, and a second annular limiting plate is fixedly installed on the outer side of the right part of the left push rod corresponding to the position between the left side of the left limiting boss and the right side of the left end cover; A right clamping slot opening to the right is provided at the right end of the right top plate, and the right clamping slot includes a right taking-out section and a right limiting section. The right taking-out section is in an arc shape opening downward, and the right limiting section is in a U shape opening upward. The lower part of the right taking-out section and the upper part of the right limiting section are connected to each other, and a third limiting plate rotatably mounted on the inner side of the lower part of the right limiting section is fixedly installed on the left end of the right push rod, a U-shaped right limiting boss opening upward is fixedly installed on the inner side of the right part of the right limiting section corresponding to the right side of the third limiting plate, and a fourth annular limiting plate is fixedly installed on the outer side of the left part of the right push rod corresponding to the position between the right side of the right limiting boss and the left side of the right end cover.

5. The packing automatic sealing and self-tightening system according to claim 1 is characterized in that The first drive assembly includes a fixed seat, a reducer, a first drive motor, a left driving gear and a right driving gear. The fixed seat is fixedly installed on the outer side of the lower part of the sealed housing, the reducer is fixedly installed on the front side of the fixed seat, the first drive motor is fixedly installed on the front side of the reducer, the rear end of the output shaft of the first drive motor is installed together with the input shaft of the reducer, the rear side of the reducer is provided with a reduction box fixedly installed in the fixed seat, the rear end of the output shaft of the reducer passes through the front side of the reduction box and a driving bevel gear is fixedly installed, the left and right sides of the reduction box are respectively provided with a left rotating hole and a right rotating hole, and the left rotating hole rotates A left output shaft is installed, and a left driven bevel gear meshing with the left part of the driving bevel gear is fixedly installed on the outer side of the right end of the left output shaft, and a left driving gear is fixedly installed on the outer side of the left end of the left output shaft, and a left driven gear meshing with the left part of the left driving gear is fixedly installed on the outer side of the left part of the left valve stem, and a right output shaft is rotatably installed in the right rotating hole, and a right driven bevel gear meshing with the right part of the driving bevel gear is fixedly installed on the outer side of the left end of the right output shaft, and a right driving gear is fixedly installed on the outer side of the right end of the right output shaft, and a right driven gear meshing with the right part of the right driving gear is fixedly installed on the outer side of the right part of the right valve stem.

6. The packing automatic sealing and self-tightening system according to claim 5 is characterized in that The left valve stem includes a connecting plate and a pull rod. The outer side of the right part of the pull rod is screwed into the left threaded hole. A circular connecting plate is fixedly installed on the left end of the left valve core. A connecting groove opening to the left is provided on the left end of the connecting plate. The connecting groove includes a disassembly section and a rotation section. The disassembly section is in an arc shape opening downward, and the rotation section is in a U shape opening upward. The lower part of the disassembly section and the upper part of the rotation section are connected to each other. A right limiting ring platform is fixedly installed on the outer side of the right end of the pull rod and is rotatably installed on the inner side of the lower part of the rotating section. A U-shaped limiting platform opening upward is fixedly installed on the inner side of the left part of the rotating section corresponding to the left end position of the right limiting ring platform. A ring-shaped left limiting ring platform is fixedly installed on the outer side of the right part of the pull rod at the position between the left side of the limiting platform and the right side of the left end cover. The left driven gear is fixedly installed on the outer side of the left part of the pull rod on the left side of the left sealing cover. The right valve stem has the same structure as the left valve stem and is symmetrically arranged.

7. The packing automatic sealing and self-tightening system according to claim 5 or 6, characterized in that The driving mechanism also includes a second control module. A left connecting frame is fixedly installed on the left end of the left end cover. A first travel switch and a second travel switch are fixedly installed in the left connecting frame corresponding to the left and right positions of the left driving gear, respectively. The first travel switch and the second travel switch are both connected to the second control module, and the second control module is connected to the first driving motor.

8. The packing automatic sealing and self-tightening system according to claim 1 or 2 or 3 or 5 or 6, characterized in that The left inner wall and the right inner wall of the mounting hole are both vertical surfaces, and the distance between the left inner wall and the right inner wall of the mounting hole is the same as the distance between the vertical surfaces of the left supporting step and the right supporting step.

9. The packing automatic sealing and self-tightening system according to claim 4, characterized in that The left inner wall and the right inner wall of the mounting hole are both vertical surfaces, and the distance between the left inner wall and the right inner wall of the mounting hole is the same as the distance between the vertical surfaces of the left supporting step and the right supporting step.

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