Bidirectional fastening open type packing box

Abstract

The invention relates to the technical field of wellhead polish rod sealing, in particular to a two-way fastening open type packing box which comprises a lower gland, an upper gland and sealing packing, the upper portion of the lower gland and the lower portion of the upper gland are detachably and fixedly installed together, an installation cavity is formed in the upper gland, and the upper portion of the installation cavity gradually becomes smaller from bottom to top. The sealing packing replacement device is reasonable and compact in structure, when the sealing packing needs to be replaced, the upper gland is detached, the upper portion of the sealing packing is exposed above the lower gland after being separated from the upper gland at the moment, the worn sealing packing can be taken out with hands without tools, and due to the design, the sealing packing replacement operation is convenient and fast. When the sealing packing is pressed, the upper gland can be screwed to press the sealing packing from top to bottom, sealing adjustment work is completed, friction force generated in the vertical movement process of the polish rod is fully utilized, the sealing effect is more excellent, the replacement time of the sealing packing is shortened, the labor intensity of sealing packing replacement operation is reduced, and the oil extraction working efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of wellhead smooth rod sealing technology, and is a bidirectional fastening open packing box. Background Technology

[0002] In the daily production and operation of the oilfield, the wellhead of the oil well is required to be kept sealed to ensure safe production and prevent environmental pollution caused by running, leaking, puncturing, or seeping. Therefore, when employees find signs of leakage in the polished rod seal or judge that the sealing packing is worn, they are required to tighten the seal or replace the sealing packing immediately.

[0003] Chinese patent document CN214145437U discloses an intelligent wellhead sealing device, which includes a packing chamber containing sealing packing. A blowout preventer cap is located on the upper part of the sealing packing, and a blowout preventer ball sleeve is connected to the side wall of the blowout preventer cap. A blowout preventer ball is located inside the blowout preventer ball sleeve, with its inner side contacting a polished rod and its outer side having a spring. An outer packing chamber sleeve is located outside the packing chamber, and a feeding device is connected to the outer packing chamber sleeve. The feeding device includes a storage box and a worm gear mechanism. The storage box contains packing connected to the sealing packing, and the worm in the worm gear mechanism is connected to a feeding motor. The worm gear is connected to the outer packing chamber sleeve. A sealing sleeve is connected to the bottom of the packing chamber, and a sealing wrench is connected to the sealing sleeve. A bevel gear is connected inside the sealing wrench via a drive shaft, and a sealing push sleeve is connected inside the bevel gear. A sealing rubber sleeve is located at the lower part of the sealing push sleeve.

[0004] Chinese patent document CN204782899U discloses a worm gear linkage wellhead seal for an oil pumping unit, comprising, from top to bottom, an upper centralizing cap, an upper centralizing body, a lower centralizing body, a ball, and a lower connector. The upper centralizing cap contains an upper packing gland cap. The upper centralizing body contains, from top to bottom, an upper packing gland, an upper packing gland seat, an adjusting worm gear seat assembly, a lower packing gland cap, and a lower packing gland. The adjusting worm gear seat assembly consists of a worm wheel and a worm, which are connected by a transmission mechanism. The worm is positioned between the upper packing gland seat and the lower packing gland cap, and a packing gland adjusting screw sleeve is fitted over the worm. A worm wheel retaining ring is provided between the upper packing gland seat and the worm wheel. The upper centralizing body has a crank handle insertion hole that communicates with the worm wheel. A blowout preventer is provided inside the ball at the connection point with the lower centralizing body, and the diameter of the blowout preventer's end is larger than the diameter of the upper port of the lower centralizing body.

[0005] The traditional method of tightening the sealing packing involves rotating the seal cap downwards and squeezing it. The purpose is to compress the sealing packing up and down and shrink it inwards to tightly grip the polished rod after the sealing packing wears down. The faster the sealing packing wears during this process, the worse the sealing effect becomes, and the more frequent the operation of tightening the sealing packing will be, until the seal fails.

[0006] Because the packing compartment of the polished rod seal has a conical structure that is wider at the top and narrower at the bottom, during the pumping process, when the load changes between the upper and lower strokes, the pressure on the sealing packing inside the polished rod seal is generally greater during the upper stroke than the lower stroke. During the upper stroke of mechanical pumping, the polished rod moves upward, generating an upward frictional force on the sealing packing, causing it to move upward. This upward force is opposite to the pressure that tightens the sealing packing, thus adversely affecting the sealing and tightening effect of the polished rod seal. Specifically, the lowermost sealing packing experiences the most severe wear, while the uppermost sealing packing experiences the least wear. Unevenness is a common problem; secondly, when replacing the sealing packing of traditional bare rod seals, the lower sealing packing becomes increasingly difficult to remove due to the depth of the packing chamber and its small inner diameter. Sometimes, the lower sealing packing breaks into small pieces, making it impossible to remove using ordinary methods, which is especially difficult in low temperatures during winter; finally, when tightening or loosening the sealing packing of traditional bare rod seals, the pressure cap of the bare rod seal must rotate around the bare rod. This method makes the automatic control device of the bare rod seal complex when intelligently controlling or upgrading the sealing packing of the bare rod seal.

[0007] Existing technologies for addressing uneven wear of the sealing packing include installing a pre-tightening spring at the bottom of the packing compartment to increase the upward reaction force. However, the spring's reaction force is limited due to the limited compression of the sealing packing. Another existing solution for addressing the difficulty of removing the sealing packing involves manufacturing a specialized removal tool. However, this doesn't fundamentally solve the removal difficulty, especially in low-temperature winter conditions. Existing technologies for the intelligent transformation of traditional polished rod seals involve first modifying the seal's pressure cap, then using gear pairs, worm gear mechanisms, servo motors, and support devices for automated control. Therefore, there is a need to develop a polished rod seal that can effectively utilize the friction during the up-and-down movement of the polished rod to ensure good sealing performance and extend the sealing cycle, while also enabling rapid removal of the sealing packing and facilitating intelligent control or transformation. Summary of the Invention

[0008] This invention provides a bidirectional fastening open packing box, which overcomes the shortcomings of the prior art and can effectively solve the problem of difficulty in removing the packing material when replacing the packing in the existing packing box.

[0009] The technical solution of the present invention is achieved through the following measures: a bidirectional fastening open packing box, including a lower pressure cover, an upper pressure cover and a sealing packing, the upper part of the lower pressure cover and the lower part of the upper pressure cover are detachably and fixedly installed together, the upper pressure cover has an installation cavity inside, the upper part of the installation cavity gradually decreases in size from bottom to top, the sealing packing is installed in the installation cavity, a lower inner ring platform is fixed on the inner side of the upper part of the lower pressure cover, a support sleeve is provided above the lower inner ring platform, the sealing packing is located at the upper end of the support sleeve, a hollow push rod is provided in the lower inner ring platform with its upper end in contact with the lower end of the support sleeve, and an upper lifting mechanism that enables the hollow push rod to move up and down is installed in the lower pressure cover corresponding to the position below the lower inner ring platform.

[0010] The following are further optimizations and / or improvements to the above-mentioned technical solution: The upper end of the aforementioned sealing packing may be provided with a top seat fitted onto the inner side of the upper pressure cover, and an upper inner ring platform is fixed to the inner side of the upper pressure cover corresponding to the position of the top seat.

[0011] The inner side of the lower part of the top seat and the outer side of the upper part of the sealing packing can both gradually increase in size from top to bottom.

[0012] A valve assembly can be fixedly installed at the lower end of the aforementioned lower pressure cover, and an eccentric flange is installed at the lower part of the valve assembly.

[0013] As a preferred embodiment, the aforementioned upper lifting mechanism may include a worm gear, a worm, and a first retaining ring. The inner side of the lower inner ring platform is screwed together with the outer side of the hollow push rod. A worm gear is fitted onto the outer side of the support sleeve corresponding to the lower end of the lower inner ring platform. A first retaining ring is provided on the inner side of the lower pressure cover corresponding to the lower end of the worm gear. A rotating hole with internal and external communication is provided on the outer side of the lower pressure cover. A worm gear that meshes with the worm gear at the front is installed in the rotating hole.

[0014] A first rotating handle can be fixedly installed on the outer side of the rear part of the worm gear at the position corresponding to the lower pressure cover; or, a first support can be fixedly installed on the outer side of the rear part of the lower pressure cover, and a first drive motor can be fixedly installed on the rear part of the first support, with the front end of the output shaft of the first drive motor being driven together with the rear end of the worm gear.

[0015] As another preferred embodiment, the aforementioned upper lifting mechanism may include a driving bevel gear, a driven bevel gear, and a rotating shaft. The driven bevel gear is connected to the outer side of the hollow push rod at the lower end of the lower inner ring platform via a helical pair. The outer side of the lower pressure cover is provided with a transmission hole that communicates internally and externally. A rotating shaft is sealed and rotatably installed in the transmission hole. A driving bevel gear that meshes with the driven bevel gear is fixedly installed on the outer side of the front part of the rotating shaft.

[0016] A second rotating handle can be fixedly installed on the outer side of the rear part of the rotating shaft at the position corresponding to the lower pressure cover; or, a second support can be fixedly installed on the outer side of the rear part of the lower pressure cover, and a second drive motor can be fixedly installed on the rear part of the second support. The front end of the output shaft of the second drive motor is connected to the rear end of the rotating shaft for transmission.

[0017] The inner side of the lower part of the upper pressure cover can be fixedly installed on the inner side of the upper part of the lower pressure cover, and a sealing element is fitted on the inner side of the lower pressure cover at the position between the lower end of the lower pressure cover and the upper end of the lower inner ring platform.

[0018] A sealing plate can be fixedly installed on the inner side of the upper end of the upper pressure cover above the upper inner ring platform. The lower end of the sealing plate and the upper part of the upper inner ring platform are provided with an oil scraper ring.

[0019] The present invention has a reasonable and compact structure. In use, the lower side of the pressure cap is fixedly installed together with the wellhead device, and the upper end of the polished rod passes through the sealing packing. The inner side of the sealing packing is in sealing contact with the outer side of the polished rod. The upper end of the sealing packing is always located above the upper end of the pressure cap during the operation.

[0020] The upper part of the mounting cavity can be a cone, funnel, or trumpet shape that gradually decreases in size from bottom to top. When the polished rod moves upward, the pump lifts the downhole fluid, and the sealing packing experiences the greatest pressure from the fluid in the well. At this time, the friction of the polished rod is upward, causing the lower end of the sealing packing to move upward. The mounting cavity, which gradually decreases in size from bottom to top, automatically presses the sealing packing, squeezing it to make tight contact with the outside of the polished rod, resulting in the best sealing effect. When the polished rod moves downward, the pump moves downward, the fluid pressure in the well decreases, the friction of the polished rod is downward, and the lower end of the sealing packing moves downward. The pressure on the sealing packing in the mounting cavity decreases, reducing expansion and deformation, thereby reducing wear on the sealing packing caused by the polished rod.

[0021] When the sealing packing needs to be replaced, remove the upper cover. At this time, the upper part of the sealing packing will be exposed above the lower cover after separating from the upper cover. The worn sealing packing can be removed by hand without the need for tools. This design makes the replacement of the sealing packing convenient and quick.

[0022] When tightening the sealing packing, the upper pressure cap can be tightened to press the sealing packing from top to bottom, thus completing the sealing adjustment work. This fully utilizes the friction force during the up-and-down movement of the polished rod, resulting in a better sealing effect, reducing the time required to replace the sealing packing, lowering the labor intensity of replacing the sealing packing, and improving the working efficiency of oil production. Attached Figure Description

[0023] Appendix Figure 1 This is a front view schematic diagram of the structure in embodiments one to six of the present invention, in which a first rotating handle is installed on the outside of the worm gear.

[0024] Appendix Figure 2 This is a left-side view of the structure in Embodiments 1 to 6 of the present invention, in which a first rotating handle is installed on the outside of the worm gear.

[0025] Appendix Figure 3 This is a schematic diagram of the main cross-sectional view of the structure in embodiments one to six of the present invention, in which a first rotating handle is installed on the outside of the worm gear.

[0026] Appendix Figure 4 This is a left-side cross-sectional view of the structure in embodiments one through six of the present invention, showing a first rotating handle mounted on the outer side of the worm gear.

[0027] Appendix Figure 5 This is a right-side cross-sectional view of the structure in embodiments one to six of the present invention, showing the first rotating handle mounted on the outside of the worm gear.

[0028] Appendix Figure 6This is a bottom cross-sectional view of the structure in Embodiments 1 to 6 of the present invention, showing a first rotating handle mounted on the outside of the worm gear.

[0029] Appendix Figure 7 This is a three-dimensional structural diagram of a first rotating handle mounted on the outside of the worm gear in embodiments one to six of the present invention.

[0030] Appendix Figure 8 For the appendix Figure 7 A three-dimensional structural diagram of the bidirectional fastening open packing box after removing the upper and lower pressure caps.

[0031] Appendix Figure 9 This is a left-side view of the structure in Embodiments 1 to 6 of the present invention, in which a first drive motor is mounted on the outside of the worm gear.

[0032] Appendix Figure 10 This is a right-side cross-sectional view of the structure in Embodiments 1 to 6 of the present invention, showing the first drive motor mounted on the outside of the worm gear.

[0033] Appendix Figure 11 This is a top cross-sectional view of the structure in Embodiments 1 to 6 of the present invention, showing the first drive motor mounted on the outside of the worm gear.

[0034] Appendix Figure 12 This is a three-dimensional structural diagram of a first drive motor mounted on the outside of the worm gear in embodiments one to six of the present invention.

[0035] Appendix Figure 13 For the appendix Figure 12 A three-dimensional structural diagram of the bidirectional fastening open packing box after removing the upper and lower pressure caps.

[0036] Appendix Figure 14 This is a front view schematic diagram of the structure in embodiments seven to ten of the present invention, in which a second rotating handle is installed on the outside of the rotating shaft.

[0037] Appendix Figure 15 This is a left-side view of the structure in embodiments seven to ten of the present invention, in which a second rotating handle is installed on the outside of the rotating shaft.

[0038] Appendix Figure 16 This is a schematic diagram of the main cross-sectional view of the structure in embodiments seven to ten of the present invention, in which a second rotating handle is installed on the outside of the rotating shaft.

[0039] Appendix Figure 17 This is a right-side cross-sectional view of the structure in embodiments seven to ten of the present invention, showing a second rotating handle mounted on the outer side of the rotating shaft.

[0040] Appendix Figure 18 This is a bottom cross-sectional view of the structure in embodiments seven to ten of the present invention, showing a second rotating handle mounted on the outside of the rotating shaft.

[0041] Appendix Figure 19This is a three-dimensional structural diagram of a second rotating handle installed on the outside of the rotating shaft in embodiments seven to ten of the present invention.

[0042] Appendix Figure 20 For the appendix Figure 19 The diagram shows the right-side view of the bidirectional fastening open packing box after removing the upper pressure cover, lower pressure cover, and anti-loosening nut.

[0043] Appendix Figure 21 For the appendix Figure 19 A three-dimensional structural diagram of the bidirectional fastening open packing box after removing the upper pressure cover, lower pressure cover, and anti-loosening nut.

[0044] Appendix Figure 22 This is a left-side view of the structure in embodiments seven to ten of the present invention, in which a second drive motor is mounted on the outside of the rotating shaft.

[0045] Appendix Figure 23 This is a right-side cross-sectional view of the structure in embodiments seven to ten of the present invention, showing a second drive motor mounted on the outer side of the rotating shaft.

[0046] Appendix Figure 24 This is a bottom cross-sectional view of the structure in embodiments seven to ten of the present invention, showing a second drive motor mounted on the outside of the rotating shaft.

[0047] Appendix Figure 25 This is a three-dimensional structural diagram of a second drive motor mounted on the outside of the rotating shaft in embodiments seven to ten of the present invention.

[0048] Appendix Figure 26 For the appendix Figure 12 A schematic diagram of the left-side structure of the bidirectional fastening open packing box after removing the upper pressure cover, lower pressure cover, and anti-loosening nut.

[0049] Appendix Figure 27 For the appendix Figure 12 A three-dimensional structural diagram of the bidirectional fastening open packing box after removing the upper pressure cover, lower pressure cover, and anti-loosening nut.

[0050] The codes in the attached diagram are as follows: 1 is the lower pressure cap, 2 is the upper pressure cap, 3 is the sealing packing, 4 is the smooth rod, 5 is the lower inner ring platform, 6 is the support sleeve, 7 is the upper inner ring platform, 8 is the top seat, 9 is the valve assembly, 10 is the eccentric flange, 11 is the hollow push rod, 12 is the outer ring platform, 13 is the worm gear, 14 is the worm, 15 is the first retaining ring, 16 is the retaining ring, 17 is the sealing sleeve, 18 is the sealing gasket, 19 is the first rotating handle, 20 is the first support, 21 is the first drive motor, 22 is the driving bevel gear, 23 is the driven bevel gear, 24 is the rotating shaft, 25 is the bearing, 26 is the second rotating handle, 27 is the second support, 28 is the second drive motor, 29 is the sealing element, 30 is the sealing pressure plate, 31 is the oil scraper ring, and 32 is the anti-loosening nut. Detailed Implementation

[0051] The present invention is not limited to the following embodiments, and the specific implementation can be determined according to the technical solution of the present invention and the actual situation.

[0052] In this invention, for ease of description, the description of the relative positions of the components is based on the appendix to the specification. Figure 1 The layout is described using a diagrammatic method, such as the positional relationships of front, back, top, bottom, left, and right, which are based on the instructions attached. Figure 1 The orientation of the layout is determined by the direction of the map.

[0053] The present invention will be further described below with reference to embodiments and accompanying drawings: Example 1: As shown in the attached document Figures 1 to 13 As shown, the bidirectional fastening open packing box includes a lower pressure cover 1, an upper pressure cover 2, and a sealing packing 3. The upper part of the lower pressure cover 1 and the lower part of the upper pressure cover 2 are detachably and fixedly installed together. The upper pressure cover 2 has an installation cavity inside, which gradually decreases in size from bottom to top. The sealing packing 3 is installed inside the installation cavity. A lower inner ring platform 5 is fixed to the inner side of the upper part of the lower pressure cover 1. A support sleeve 6 is provided above the lower inner ring platform 5. The sealing packing 3 is located on the upper end of the support sleeve 6. A hollow push rod 11 is provided inside the lower inner ring platform 5, with its upper end in contact with the lower end of the support sleeve 6. A top lifting mechanism that allows the hollow push rod 11 to move up and down is installed in the lower pressure cover 1 at the position below the lower inner ring platform 5.

[0054] Depending on the requirements, at least one rotating handle may be evenly distributed around the upper outer side of the upper cover 2 in the circumferential direction; or the cross-section of the upper part of the upper cover 2 may be square or regular hexagonal, which facilitates the disassembly and assembly of the upper cover 2 and the lower cover 1. The lower inner side of the upper cover 2 is a straight hole, and the lower end of the mounting cavity is connected to the upper end of the straight hole. The upper inner side of the lower cover 1 and the lower outer side of the upper cover 2 can be detachably and fixedly installed together by threaded connection.

[0055] In use, the lower side of the pressure cap 1 is fixedly installed together with the wellhead device, and the upper end of the polished rod 4 is passed through the sealing packing 3. The inner side of the sealing packing 3 is in sealing contact with the outer side of the polished rod 4. The upper end of the sealing packing 3 is always located above the upper end of the pressure cap 1 during operation.

[0056] The upper part of the mounting cavity can be a cone, funnel, or trumpet shape that gradually decreases in size from bottom to top. When the polished rod 4 moves upward, the pump lifts the downhole fluid, and the sealing packing 3 experiences the greatest pressure from the fluid in the well. At this time, the friction of the polished rod 4 is upward, causing the lower end of the sealing packing 3 to move upward. The mounting cavity, which gradually decreases in size from bottom to top, automatically presses the sealing packing 3, squeezing it to make tight contact with the outside of the polished rod 4, resulting in the best sealing effect. When the polished rod 4 moves downward, the pump moves downward, the fluid pressure in the well decreases, the friction of the polished rod 4 is downward, and the lower end of the sealing packing 3 moves downward. The pressure on the sealing packing 3 in the mounting cavity decreases, reducing expansion and deformation, thereby reducing the wear of the polished rod 4 on the sealing packing 3.

[0057] When the sealing packing 3 needs to be replaced, remove the upper cover 2. At this time, the upper part of the sealing packing 3 will be exposed above the lower cover 1 after separating from the upper cover 2. The worn sealing packing 3 can be removed by hand without the need for tools. This design makes the replacement of the sealing packing 3 convenient and quick.

[0058] When tightening the sealing packing 3, the upper pressure cap 2 can be tightened to press the sealing packing 3 from top to bottom, thus completing the sealing adjustment work. The friction force during the up-and-down movement of the polished rod 4 is fully utilized to make the sealing effect better, reduce the replacement time of the sealing packing 3, reduce the labor intensity of the operation of replacing the sealing packing 3, and improve the oil production working efficiency.

[0059] An outer ring platform 12 is fixed on the outer side of the upper end of the hollow push rod 11, which increases the contact area between the support sleeve 6 and the hollow push rod 11. The upper lifting mechanism is a known technology, such as a worm gear mechanism, a gear and rack mechanism, or a bevel gear mechanism.

[0060] During use, the sealing packing 3 can be tightened in both directions during the production operation of the oil well. It can be done by squeezing the sealing packing 3 from bottom to top through the upper jacking mechanism and the support sleeve 6, or by rotating the pressure cap 2 to press the sealing packing 3 from top to bottom, thus completing the sealing adjustment work.

[0061] The sealing packing 3 is first installed on the support sleeve 6. The top seat 8 is placed on the top of the sealing packing 3. The lower part of the upper pressure cover 2 is screwed to the upper inner side of the lower pressure cover 1. In order to prevent the upper pressure cover 2 from loosening, a lock nut 32 is screwed to the lower outer side of the upper pressure cover 2 corresponding to the upper end of the lower pressure cover 1. The upper pressure cover 2 and the top seat 8 press the sealing packing 3 from top to bottom. Then tighten the lock nut 32 so that the lower end of the lock nut 32 contacts the upper end of the upper pressure cover 2. Alternatively, the hollow push rod 11 and the support sleeve 6 can be moved upward through the upper lifting mechanism. In this way, the sealing packing 3 can be pressed from bottom to top to achieve the purpose of bidirectional fastening, so that the sealing packing 3 is evenly pressed from top to bottom and wears evenly.

[0062] When the sealing packing 3 needs to be replaced, first loosen the upper cover 2. Under the action of gravity, the top seat 8 and the sealing packing 3 will separate from the upper cover 2. Then, the hollow push rod 11 and the support sleeve 6 will continue to move upward through the upper lifting mechanism. When the sealing packing 3 is fully exposed outside the upper cover 2, it can be removed by hand. Moreover, after the sealing packing 3 loses the constraint of the upper cover 2, its own elasticity will expand outward, which will automatically separate from the bare rod 4, greatly reducing the difficulty of replacing the sealing packing 3.

[0063] This application utilizes the frictional force of the up-and-down movement of the polished rod 4 to improve the sealing effect of the sealing packing 3. This application can fasten the sealing packing 3 from both the top and bottom ends, achieving a uniform expansion and sealing effect at both ends of the sealing packing 3, thus increasing the sealing cycle of the sealing packing 3 at the wellhead polished rod 4. When removing the sealing packing 3, no retrieval tools are needed; simply remove the upper pressure cap 2, and the upper part of the sealing packing 3 will be automatically exposed, allowing for direct removal by hand. Alternatively, the upper lifting mechanism can be used to lift the sealing packing 3, exposing it completely before removal, thus improving the work efficiency of personnel replacing the sealing packing 3.

[0064] The above-mentioned bidirectional fastening open packing box can be further optimized and / or improved according to actual needs: Example 2: As an optimization of the above examples, as shown in the appendix. Figure 3 , 5 As shown in Figure 10, the upper end of the sealing packing 3 is provided with a top seat 8 fitted on the inner side of the upper part of the upper pressure cover 2, and the inner side of the upper pressure cover 2 corresponding to the upper end of the top seat 8 is fixed with an upper inner ring platform 7.

[0065] According to requirements, the support sleeve 6 is made of copper. During use, by setting the support sleeve 6, the pre-tightening force on the sealing packing 3 after the lower pressure cover 1 and the upper pressure cover 2 are fixed together can be adjusted, which can reduce the embedding depth of the sealing packing 3 in the lower pressure cover 1, making it easier to replace the sealing packing 3. The top seat 8 can be made of copper. The inner side of the top seat 8 is provided with a sealing ring groove. A sealing ring that makes sealing contact with the outer side of the smooth rod 4 is installed in the sealing ring groove. The sealing ring can prevent wind, sand, rain and snow from entering the inner side of the sealing packing 3 along the smooth rod 4, thereby preventing the sealing packing 3 from aging and failing due to wind, sand, rain and snow, and extending the service life of the sealing packing 3. On the other hand, when the sealing packing 3 rotates, the wear between the top seat 8 and the sealing packing 3 can be further reduced, ensuring the sealing effect of the sealing packing 3 in close contact with the outer side of the smooth rod 4 when it travels on the smooth rod 4.

[0066] Example 3: As an optimization of the above examples, as shown in the appendix. Figure 3 , 5 As shown in Figures 8, 10, and 13, the inner side of the lower part of the top seat 8 and the outer side of the upper part of the sealing packing 3 gradually increase in size from top to bottom.

[0067] Depending on the requirements, the lower inner side of the top seat 8 and the sealing packing 3 can both be tapered or funnel-shaped, with the tapering at the top being smaller than the tapering at the bottom. The tapering at the lower outer side of the sealing packing 3 is smaller than the tapering at the upper outer side of the sealing packing 3, and the upper part of the sealing packing 3 further contracts, meaning that the tapering at the outer side of the sealing packing 3 can gradually increase from bottom to top. In this way, when the polished rod 4 moves upward, the lower end of the sealing packing 3 moves upward, and the sealing packing 3 is gradually compressed from bottom to top. Since the sealing packing 3 is elastic and has a certain height, the pressure on the lower end of the sealing packing 3 gradually decreases from bottom to top as it is transmitted upward. The sealing packing 3 is tapered, with the tapering at the top being smaller than the bottom. This ensures that the sealing packing 3 can quickly contract inward even under small pressure, ensuring that the upper inner side of the sealing packing 3 and the outer side of the polished rod 4 are in sealing contact, thereby ensuring the sealing effect. When the top seat 8 is worn, only the top seat 8 needs to be replaced, which can ensure the continuous use of the upper pressure cover 2 and reduce maintenance costs.

[0068] Example 4: As an optimization of the above examples, as shown in the appendix. Figures 1 to 5 As shown in Figures 7 to 13, a valve assembly 9 is fixedly installed at the lower end of the lower pressure cover 1, and an eccentric flange 10 is installed at the lower part of the valve assembly 9.

[0069] Depending on the requirements, valve assembly 9 is a known prior art, such as the "valve assembly" described in the Chinese patent document CN106150419A, which discloses a universal adjustment quick-change packing wellhead packing box, or a rubber gate, or the "left valve core, right valve core, first drive assembly, second drive assembly and cross-shaped sealing housing" described in the Chinese patent document CN119221853B, which describes a packing automatic sealing self-tightening system, or the "blowout preventer housing, left valve core, right valve core and drive assembly" described in the Chinese patent document CN119221855B, which describes a wellhead blowout preventer.

[0070] Eccentric flange 10 is a known technology, such as the "eccentric flange" described in the packing box published in Chinese patent document CN205858245U, or the "eccentric flange" described in an anti-eccentric wear production tree for oil wells published in Chinese patent document CN208650823U.

[0071] When the sealing packing 3 is severely worn and can no longer provide a seal, it needs to be replaced. At this time, the polished rod 4 can be sealed by the valve assembly 9 (rotate the handles on both sides of the valve assembly 9, and the sealing valve core of the valve assembly 9 will grip the polished rod 4, blocking the transmission of wellhead pressure). Then the sealing packing 3 can be replaced.

[0072] During operation, the relative positions of the valve assembly 9, the upper pressure plate 2, and the lower pressure plate 1 can be adjusted through the eccentric flange 10 to align the polished rod 4 with the sealing packing 3, thereby preventing uneven wear between the polished rod 4 and the sealing packing 3.

[0073] Example 5: As an optimization of the above embodiments, as shown in the appendix Figure 3 , 4 As shown in Figures 5, 6, 8, 10, 11, and 13, the upper lifting mechanism includes a worm gear 13, a worm 14, and a first retaining ring 15. The inner side of the lower inner ring platform 5 is screwed together with the outer side of the hollow push rod 11. The worm gear 13 is clamped on the outer side of the support sleeve 6 corresponding to the lower end of the lower inner ring platform 5. The first retaining ring 15 is provided on the inner side of the lower pressure cover 1 corresponding to the lower end of the worm gear 13. The outer side of the lower pressure cover 1 is provided with a rotating hole that communicates with the inside and outside. The worm 14, which meshes with the worm gear 13 at the front, is sealed and rotatably installed in the rotating hole.

[0074] According to the requirements, a worm gear 13 is fitted on the outer side of the support sleeve 6 at the lower end of the lower inner ring platform 5. When the worm gear 13 rotates, it can transmit torque to the hollow push rod 11. At least one vertical surface can be provided on the outer side of the hollow push rod 11. In this embodiment, two vertical surfaces are symmetrically provided on the outer side of the hollow push rod 11. The inner side of the worm gear 13 has a plane that matches the vertical surface. The hollow push rod 11 is fitted on the inner side of the worm gear 11. The inner side of the lower inner ring platform 5 is screwed together with the outer side of the hollow push rod 11. When the worm gear 13 rotates, the hollow push rod 11 can spirally rise on the inner side of the lower inner ring platform 5. The hollow push rod 11 drives the support sleeve 6 to move upward, so that the sealing packing 3 can be pressed from bottom to top. Under the constraint of the first retaining ring 15 and the lower inner ring platform 5, the worm gear 13 moves downward relative to the hollow push rod 11.

[0075] Alternatively, keyways with downward openings can be provided on both the inner side of the worm gear 13 and the outer side of the hollow push rod 11, and the inner side of the worm gear 13 and the outer side of the hollow push rod 11 can be connected together by a key clip installed in the keyway.

[0076] Alternatively, the hollow push rod 11 is fitted inside the lower inner ring platform 5. The outer side of the hollow push rod 11 at the lower end of the lower inner ring platform 5 is connected to a worm gear 13 via a screw pair. The screw pair is a known technology. For example, the inner side of the worm gear 13 is threaded to the outer side of the hollow push rod 11. In this way, the rotational motion of the worm gear 13 can be converted into the linear motion of the hollow push rod 11. Alternatively, it can be a ball screw pair. The hollow push rod 11 has a hollow screw structure. Balls are set on the inner side of the worm gear 13 and the outer side of the hollow push rod 11, so that the rotation of the hollow push rod 11 is more flexible.

[0077] The first retaining ring 15 is a known retaining ring for holes. A retaining ring 16 is provided between the upper end of the first retaining ring 15 and the lower end of the worm gear 13. This reduces the wear of the worm gear 13 on the first retaining ring 15, prevents the worm gear 13 from wobbling after the first retaining ring 15 is damaged, and facilitates the adjustment of the installation position of the worm gear 13, reducing the machining difficulty of the slot used to install the first retaining ring 15. The lower outer side of the hollow push rod 11 is provided with an annular groove, in which a second retaining ring is fitted. The second retaining ring is a known retaining ring for shafts. After the second retaining ring moves upward, it contacts the first retaining ring 15, which can prevent the hollow push rod 11 from moving too far upward after the worm gear 13 rotates. The phenomenon that causes the worm gear 13 and the hollow push rod 11 to separate is addressed by screwing a sealing sleeve 17 onto the outer rear part of the lower pressure cover 1 at the position corresponding to the rotation hole. The inner side of the sealing sleeve 17 is in sealing contact with the outer rear part of the worm 14. A sealing step is provided at the rear of the rotation hole, and a sealing gasket 18 is provided between the sealing step and the front end of the sealing sleeve 17. This can improve the sealing performance between the sealing sleeve 17 and the lower pressure cover 1. The inner side of the sealing sleeve 17 and the outer rear part of the worm 14 can be provided with existing known sealing rings or mechanical seals. The setting of the sealing sleeve 17 facilitates the sealing between the worm 14 and the rotation hole, and also facilitates the replacement of the sealing element 29 and the sealing sleeve 17 after wear.

[0078] Example 6: As an optimization of the above examples, as shown in the appendix Figure 2 , 4 As shown in Figures 5, 6, 7, and 8, a first rotating handle 19 is fixedly installed on the outer side of the rear part of the worm gear 14 corresponding to the position behind the lower pressure cover 1.

[0079] Or, as attached Figures 9 to 13 As shown, a first support 20 is fixedly installed on the outer rear part of the lower pressure cover 1, and a first drive motor 21 is fixedly installed on the rear part of the first support 20. The front end of the output shaft of the first drive motor 21 is connected to the rear end of the worm gear 14 for transmission.

[0080] Depending on the requirements, the worm 14 may include a worm body and a connecting rod inserted into the inner side of the rear end of the worm body. A sealing sleeve 17 is fixedly installed on the inner side of the rear part of the rotating hole. A sealing gasket 18 is provided between the front end of the sealing sleeve 17 and the rear end of the worm 14. A square hole is provided at the rear end of the worm 14. A bushing fitted on the front side of the sealing gasket 18 and fitted onto the outer side of the rear part of the worm 14 is provided. A connecting rod is rotatably installed inside the sealing sleeve 17. The front end of the connecting rod is inserted into the square hole. A first rotating handle 19 is installed on the outer side of the rear part of the connecting rod. After rotating the first rotating handle 19, torque can be transmitted to the worm 14 through the connecting rod, thereby driving the worm 14 to rotate. This also facilitates the disassembly and assembly of the worm 14. Alternatively, the front end of the output shaft of the first drive motor 21 and the rear end of the connecting rod are rotatably connected together through a known coupling.

[0081] During use, when the sealing packing 3 is pressed by setting the first rotating handle 19, the worm gear 14 is rotated by rotating the first rotating handle 19, which in turn drives the worm wheel 13 to rotate. When the worm wheel 13 rotates, the hollow push rod 11 moves upward. When the hollow push rod 11 moves upward, it presses the sealing packing 3 from bottom to top through the support sleeve 6, so that the inner side of the sealing packing 3 is in sealing contact with the outer side of the smooth rod 4. When the sealing packing 3 needs to be replaced, the first rotating handle 19 is rotated in the opposite direction, so that the top seat 8 and the sealing packing 3 move downward. In this way, the top seat 8 separates from the upper inner ring platform 7 of the upper pressure cover 2. The top seat 8 no longer presses the upper inner ring platform 7, making the disassembly of the upper pressure cover 2 easier. After the upper pressure cover 2 is removed, the sealing packing 3 and the top seat 8 are fully exposed, and the sealing packing 3 can be removed by hand.

[0082] The first drive motor 21 is a known technology, such as a geared motor or a stepper motor. The first drive motor 21 can be connected to a known controller. In order to facilitate the disassembly and assembly between the first support 20 and the lower cover 1, the lower cover 1 has at least one vertical surface at the rear. In this embodiment, the outer contour surface of the lower cover 1 can be square. The front end of the output shaft of the first drive motor 21 and the rear end of the worm gear 14 are connected together by a known coupling.

[0083] When the sealing packing 3 is pressed, the first drive motor 21 drives the worm gear 14 to rotate, which in turn drives the worm wheel 13 to rotate. When the worm wheel 13 rotates, the hollow push rod 11 moves upward. When the hollow push rod 11 moves upward, it squeezes the sealing packing 3 from bottom to top through the support sleeve 6, so that the inner side of the sealing packing 3 makes sealing contact with the outer side of the smooth rod 4. When the sealing packing 3 needs to be replaced, the output shaft of the first drive motor 21 rotates in the opposite direction, causing the top seat 8 and the sealing packing 3 to move downward. In this way, the top seat 8 separates from the upper inner ring platform 7 of the upper pressure cover 2, and the top seat 8 no longer squeezes the upper inner ring platform 7, making the disassembly of the upper pressure cover 2 easier. After the upper pressure cover 2 is removed, the sealing packing 3 and the top seat 8 are fully exposed, and the sealing packing 3 can be removed by hand.

[0084] Alternatively, the first drive motor 21 can be connected to the output terminal of the PLC control module in the RTU box of the oil pumping unit via a connecting line. This allows the first drive motor 21 to be controlled according to instructions, enabling remote pressing of the sealing packing 3 and reducing maintenance costs.

[0085] Since the sealing packing 3 can be fastened by the top mechanism, when the polished rod seal is upgraded to intelligent, only the first drive motor 21 of the top mechanism needs to be controlled to complete the automatic control. This requires less equipment and less investment, providing feasible technical support for the intelligent control of oil wells and solving the problem of complex automatic control devices for polished rod seals when upgrading traditional polished rod seals to intelligent.

[0086] Example 7: As another optimization of the above embodiments, as shown in the appendix. Figures 14 to 21 As shown, the upper top mechanism includes a driving bevel gear 22, a driven bevel gear 23, and a rotating shaft 24. The driven bevel gear 23 is connected to the outer side of the hollow push rod 11 at the lower end of the lower inner ring platform 5 via a screw pair. The outer side of the lower pressure cover 1 is provided with a transmission hole that communicates with the inside and outside. The rotating shaft 24 is installed in the transmission hole and sealed. The driving bevel gear 22, which meshes with the driven bevel gear 23, is fixedly installed on the outer side of the front part of the rotating shaft 24.

[0087] According to requirements, a known bearing 25, such as a deep groove ball bearing, is installed between the outer side of the driven bevel gear 23 and the inner side of the lower pressure cover 1. The lower outer side of the driven bevel gear 23 meshes with the upper outer side of the driving bevel gear 22, so that the driving bevel gear 22 can also support the driven bevel gear 23. The outer side of the hollow push rod 11 at the lower end of the lower inner ring platform 5 is connected to the driven bevel gear 23 through a helical pair. The helical pair is a known technology. For example, the inner side of the driven bevel gear 23 and the outer side of the hollow push rod 11 form a ball screw pair. In this way, the rotational motion of the driven bevel gear 23 can be converted into the linear motion of the hollow push rod 11. In order to prevent the driven bevel gear 23 from rotating and meshing with the hollow push rod 11, the following measures are taken. The push rods 11 are separated from each other. The length of the hollow push rod 11 is greater than the height of the sealing packing 3. A sealing sleeve 17 is screwed to the outer rear part of the lower pressure cover 1 corresponding to the position of the transmission hole. The inner side of the sealing sleeve 17 is in sealing contact with the outer rear part of the worm gear 14. A sealing step is provided at the rear of the transmission hole. A sealing gasket 18 is provided between the sealing step and the front end of the sealing sleeve 17. This can improve the sealing performance between the sealing sleeve 17 and the lower pressure cover 1. The inner side of the sealing sleeve 17 and the outer rear part of the rotating shaft 24 can be provided with existing known seals 29, such as sealing rings or mechanical seals. The setting of the sealing sleeve 17 facilitates the sealing between the rotating shaft 24 and the transmission hole, and also facilitates the replacement of the seals 29 and the sealing sleeve 17 after wear.

[0088] Example 8: As an optimization of the above examples, as shown in the appendix Figure 15 , 17 As shown in Figure 21, a second rotating handle 26 is fixedly installed on the outer side of the rear part of the rotating shaft 24 corresponding to the position behind the lower pressure cover 1.

[0089] Or, as attached Figures 22 to 27 As shown, a second support 27 is fixedly installed on the outer rear part of the lower pressure cover 1, and a second drive motor 28 is fixedly installed on the rear part of the second support 27. The front end of the output shaft of the second drive motor 28 is connected to the rear end of the rotating shaft 24 for transmission.

[0090] During use, by setting the second rotating handle 26, when the sealing packing 3 is pressed, the rotating shaft 24 and the driving bevel gear 22 are rotated by rotating the second rotating handle 26, which in turn drives the driven bevel gear 23 to rotate. When the driven bevel gear 23 rotates, the hollow push rod 11 moves upward. When the hollow push rod 11 moves upward, it presses the sealing packing 3 from bottom to top through the support sleeve 6, so that the inner side of the sealing packing 3 is in sealing contact with the outer side of the smooth rod 4. When the sealing packing 3 needs to be replaced, the second rotating handle 26 is rotated in the opposite direction, so that the top seat 8 and the sealing packing 3 move downward. In this way, the top seat 8 separates from the upper inner ring platform 7 of the upper pressure cover 2. The top seat 8 no longer presses the upper inner ring platform 7, making the disassembly of the upper pressure cover 2 easier. After the upper pressure cover 2 is removed, the sealing packing 3 and the top seat 8 are fully exposed, and the sealing packing 3 can be removed by hand.

[0091] The second drive motor 28 is a known technology, such as a geared motor or a stepper motor. The second drive motor 28 can be connected to a known controller. In order to facilitate the disassembly and assembly between the second support 27 and the lower cover 1, the lower cover 1 has at least one vertical surface at the rear. In this embodiment, the outer contour surface of the lower cover 1 can be square. The front end of the output shaft of the second drive motor 28 and the rear end of the worm gear 14 are connected together by a known coupling.

[0092] When the sealing packing 3 is pressed, the second drive motor 28 drives the rotating shaft 24 and the driving bevel gear 22 to rotate, which in turn drives the driven bevel gear 23 to rotate. When the driven bevel gear 23 rotates, the hollow push rod 11 moves upward. When the hollow push rod 11 moves upward, it presses the sealing packing 3 from bottom to top through the support sleeve 6, so that the inner side of the sealing packing 3 makes sealing contact with the outer side of the smooth rod 4. When the sealing packing 3 needs to be replaced, the output shaft of the second drive motor 28 rotates in the opposite direction, causing the top seat 8 and the sealing packing 3 to move downward. In this way, the top seat 8 separates from the upper inner ring platform 7 of the upper cover 2, and the top seat 8 no longer presses the upper inner ring platform 7, making the disassembly of the upper cover 2 easier. After the upper cover 2 is removed, the sealing packing 3 and the top seat 8 are fully exposed, and the sealing packing 3 can be removed by hand.

[0093] Alternatively, the second drive motor 28 can be connected to the output terminal of the PLC control module in the RTU box of the oil pumping unit via a connecting line. This allows the second drive motor 28 to be controlled according to instructions, enabling remote pressing of the sealing packing 3 and reducing maintenance costs.

[0094] Since the sealing packing 3 can be fastened by the top mechanism, when the polished rod seal is upgraded to intelligent, only the second drive motor 28 of the top mechanism needs to be controlled. This embodiment can also complete the automated control, requiring less equipment and less investment. It provides feasible technical support for the intelligent control of oil wells and solves the problem of complex automatic control devices for polished rod seals when upgrading traditional polished rod seals to intelligent.

[0095] Example 9: As an optimization of the above examples, as shown in the appendix Figure 3 , 5 As shown in 8, 10, 13, 16, 17, 20, 21, 23, 26, and 27, the lower inner side of the upper pressure cover 2 is fixedly installed on the upper inner side of the lower pressure cover 1, and a sealing element 29 is fitted on the inner side of the lower pressure cover 1 at the position between the lower end of the lower pressure cover 1 and the upper end of the lower inner ring platform 5.

[0096] According to the requirements, the sealing element 29 is a known technology, such as a single-piece packing. After the upper cover 2 is tightened, the lower end of the upper cover 2 and the upper end of the lower inner ring platform 5 come into contact with the two ends of the sealing element 29 to form an end face seal, which can improve the sealing effect at the connection between the upper cover 2 and the lower cover 1. The sealing element 29 can expand and contract, so that the distance between the lower end of the upper cover 2 and the upper end of the lower inner ring platform 5 can maintain the sealing effect at the connection between the upper cover 2 and the lower cover 1 within a certain range.

[0097] Example 10: As an optimization of the above embodiments, as shown in the appendix Figure 3 , 5 As shown in 7, 8, 10, 13, 16, 17, 19, 20, 21, 23, 26, and 27, a sealing pressure plate 30 is fixedly installed on the inner side of the upper end of the upper pressure plate 2 corresponding to the position above the upper inner ring platform 7. An oil scraper ring 31 is provided at the lower end of the sealing pressure plate 30 and the upper end of the upper inner ring platform 7.

[0098] According to the requirements, the outer side of the sealing plate 30 is screwed to the inner side of the upper end of the upper cover 2. In order to facilitate the disassembly and assembly between the sealing plate 30 and the upper cover 2, two to six circular disassembly and assembly holes with upward openings are evenly distributed along the circumference at the upper end of the sealing plate 30. Both the sealing plate 30 and the oil scraper ring 31 are annular.

[0099] During the reciprocating motion of the polished rod 4 after passing through the sealing plate 30, the scraper ring 31, the upper inner ring platform 7, the top seat 8, the sealing packing 3, the support sleeve 6, and the hollow push rod 11, when the polished rod 4 moves upward, it is the stage of lifting the downhole fluid to the surface. The wellhead oil pressure will rise, and the sealing packing 3 will move slightly upward due to the friction between the polished rod 4 and the sealing packing 3. Under the constraint of the mounting cavity and the top seat 8, the sealing packing 3 will be squeezed to the center of the polished rod 4 during the slight upward movement, which improves the sealing effect of the sealing packing 3 on the polished rod 4. When the polished rod 4 moves downward, the downhole fluid enters the tubing, and the sealing packing 3 will also move slightly downward due to the friction between the polished rod 4 and the sealing packing 3. At this time, the sealing effect is the same as that of a normal packing box.

[0100] During the reciprocating motion of the polished rod 4, the sealing packing 3 will gradually wear down. To improve the sealing effect, the sealing packing 3 will be squeezed to shrink inward, achieving continuous close contact with the polished rod 4 and maintaining the sealing effect. Through the upper lifting mechanism, the hollow push rod 11 and the support sleeve 6 move upward and squeeze the lower end of the sealing packing 3, pressing the lower end of the sealing packing 3 from below. After the sealing packing 3 shrinks inward, it hugs the polished rod 4. When the upper pressure cover 2 rotates and moves downward, the upper pressure cover 2 drives the top seat 8 to move downward, thereby squeezing the upper end of the sealing packing 3 and pressing the upper end of the sealing packing 3 from above. After the sealing packing 3 shrinks inward, it hugs the polished rod 4. The lower pressing method can give full play to the sealing effect of the upper sealing packing 3 on the polished rod 4 after shrinking inward.

[0101] When the sealing packing 3 is severely worn and unable to perform its sealing function, it needs to be replaced. At this time, the polished rod 4 can be sealed by the valve assembly 9 (rotate the handles on both sides of the valve assembly 9, the sealing valve core of the valve assembly 9 will hold the polished rod 4 tightly, blocking the transmission of wellhead pressure). Remove the upper pressure cover 2, and the sealing packing 3 will be exposed and can be removed by hand. If the bottom part of the sealing packing 3 is stuck in the lower pressure cover 1, use the upper lifting mechanism to lift the sealing packing 3, and the bottom part of the sealing packing 3 will be fully exposed after being lifted up, and the sealing packing 3 can be replaced. This method is quick and convenient.

[0102] The method for automatic control of packing tightening operation in this application is simple and easy to implement due to the design of the upper jacking mechanism. When the oil well is made intelligent and daily packing tightening operation is required, the upper jacking mechanism only needs to be driven by the first drive motor 21 or the second drive motor 28. The first drive motor 21 or the second drive motor 28 is connected to the output terminal of the PLC control module in the pumping unit RTU box. In this way, the forward and reverse rotation control of the first drive motor 21 and the second drive motor 28 can be realized according to the instructions. This can achieve the purpose of remotely tightening and loosening the sealing packing 3, reducing maintenance costs, and is significantly better than the method of controlling the rotation of ordinary packing box pressure cap.

[0103] The above technical features constitute various embodiments of the present invention, which have strong adaptability and implementation effect. Unnecessary technical features can be added or removed according to actual needs to meet the needs of different situations.

Claims

1. A bidirectional fastening open packing box, characterized in that... It includes a lower pressure cover, an upper pressure cover, and a sealing packing. The upper part of the lower pressure cover and the lower part of the upper pressure cover are detachably and fixedly installed together. The upper pressure cover has an installation cavity inside, which gradually decreases in size from bottom to top. The sealing packing is installed inside the installation cavity. A lower inner ring platform is fixed to the inner side of the upper part of the lower pressure cover. A support sleeve is provided above the lower inner ring platform. The sealing packing is located at the upper end of the support sleeve. A hollow push rod is provided inside the lower inner ring platform, with its upper end in contact with the lower end of the support sleeve. A top lifting mechanism that allows the hollow push rod to move up and down is installed in the lower pressure cover corresponding to the position below the lower inner ring platform.

2. The bidirectional fastening open packing box according to claim 1, characterized in that... The upper end of the sealing packing is provided with a top seat fitted on the inner side of the upper pressure cover, and an upper inner ring platform is fixed on the inner side of the upper pressure cover corresponding to the position of the top seat.

3. The bidirectional fastening open packing box according to claim 2, characterized in that... The inner side of the lower part of the top seat and the outer side of the upper part of the sealing packing both gradually increase in size from top to bottom; Or / and, a valve assembly is fixedly installed at the lower end of the pressure cover, and an eccentric flange is installed at the lower part of the valve assembly.

4. The bidirectional fastening open packing box according to claim 1, characterized in that... The upper lifting mechanism includes a worm gear, a worm, and a first retaining ring. The inner side of the lower inner ring platform is screwed together with the outer side of the hollow push rod. The worm gear is clamped on the outer side of the support sleeve corresponding to the lower end of the lower inner ring platform. The first retaining ring is provided on the inner side of the lower pressure cover corresponding to the lower end of the worm gear. The outer side of the lower pressure cover is provided with a rotating hole that connects the inner and outer sides. The worm gear, which meshes with the worm gear at the front, is installed in the rotating hole in a sealed and rotatable manner.

5. The bidirectional fastening open packing box according to claim 4, characterized in that... A first rotating handle is fixedly installed on the outer side of the rear part of the worm gear corresponding to the position behind the lower pressure cover; or, a first support is fixedly installed on the outer side of the rear part of the lower pressure cover, and a first drive motor is fixedly installed on the rear part of the first support, with the front end of the output shaft of the first drive motor being driven together with the rear end of the worm gear.

6. The bidirectional fastening open packing box according to claim 1, characterized in that... The upper lifting mechanism includes a driving bevel gear, a driven bevel gear, and a rotating shaft. The driven bevel gear is connected to the outer side of the hollow push rod at the lower end of the lower inner ring platform via a helical pair. The outer side of the lower pressure cover is provided with a transmission hole that connects the inside and outside. The rotating shaft is sealed and rotatably installed in the transmission hole. The driving bevel gear that meshes with the driven bevel gear is fixedly installed on the outer side of the front part of the rotating shaft.

7. The bidirectional fastening open packing box according to claim 6, characterized in that... A second rotating handle is fixedly installed on the outer rear part of the rotating shaft corresponding to the position behind the lower pressure cover; or, a second support is fixedly installed on the outer rear part of the lower pressure cover, and a second drive motor is fixedly installed on the rear of the second support, with the front end of the output shaft of the second drive motor being driven together with the rear end of the rotating shaft.

8. The bidirectional fastening open packing box according to claim 2, 3, 4, 5, 6, or 7, characterized in that... The lower inner side of the upper pressure cover is fixedly installed on the upper inner side of the lower pressure cover, and a sealing element is fitted on the inner side of the lower pressure cover at the position between the lower end of the lower pressure cover and the upper end of the lower inner ring platform.

9. The bidirectional fastening open packing box according to claim 2, 3, 4, 5, 6, or 7, characterized in that... A sealing plate is fixedly installed on the inner side of the upper end of the upper pressure cover corresponding to the position above the upper inner ring platform. The lower end of the sealing plate and the upper part of the upper inner ring platform are provided with an oil scraper ring.

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