External pressure-resistant cylinder structure opened and closed by spring

Abstract

The invention discloses an external pressure-resistant cylinder structure opened and closed by a spring. The pressure-resistant cylinder structure comprises a cylinder body, a top cover plate, a supporting panel, a rotating shaft structure, a pressing frame, a locking structure, a spring assembly and a connecting rod. A rotating shaft is arranged on one side of the barrel, and a connecting rod is rotationally connected to the rotating shaft; the spring assembly and the top cover plate are arranged on the two sides of the connecting rod and form a lever structure with the rotating shaft as a fulcrum with the connecting rod. Besides, a pressing frame is arranged at the top of the top cover plate, one end of the pressing frame is hinged to the rotating shaft, the other end of the pressing frame is fixed to the side wall of the other side of the barrel through a locking structure, the top cover plate is pressed on the supporting panel of the barrel through the pressing frame, and sealing of the barrel is achieved. The internal space of the barrel is prevented from being occupied while the barrel structure is sealed. Besides, when the side, away from the rotating shaft, of the pressing frame is prepared to be fixed to the barrel or separated from the barrel, the spring assembly exerts force on the other end of the lever structure, and therefore the situation that when the top cover is closed, the top cover suddenly falls down to smash an operator is prevented, or the effect that labor is saved when the top cover is opened is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of pressure-bearing equipment, and in particular to a pressure-resistant cylinder structure opened and closed by an external spring. Background Art

[0002] There are two traditional structures for underwater pressure-resistant cylinder structures. The first is that the top cover is connected to the cylinder body through flanges and bolts. By tightening the bolts to compress the sealing ring or rubber gasket placed between the top cover and the cylinder body, the effect of sealing and bearing pressure can be achieved. The advantages of this structure are that it is relatively simple to manufacture and the sealing is reliable, but the disadvantages are that the opening and closing operations are time-consuming and inconvenient, especially for pressure-resistant structures with larger sizes and more bolts. The second is that a locking gear device is designed on the inside of the top cover. By rotating the gear device on the inside of the top cover, the top cover can lock the slats on the edge of the cylinder body, thereby compressing the sealing ring around the inside of the top cover to achieve the effect of sealing and bearing pressure. In addition, in order to facilitate personnel operation, one or more sets of spring devices will be designed on the inside of the top cover. When the top cover is closed, the spring is in a compressed state. When it is opened, the spring will provide a part of the elastic force to support the top cover's own gravity, thereby achieving a labor-saving effect. The advantage of this structural form is that the operation is time-saving and convenient, and the pressure-resistant cylinder can be opened and closed by hand. The disadvantage is that the structure is relatively complicated, and because the locking gear device and spring are placed on the inside of the top cover, part of the space inside the cylinder will be occupied. Summary of the invention

[0003] In view of the above-mentioned defects in the prior art, a pressure-resistant cylinder structure with an external spring for opening and closing is provided, which saves the internal space of the pressure-resistant cylinder structure and facilitates the rapid opening and closing of the pressure-resistant cylinder.

[0004] The technical solution adopted by the present invention to solve the above technical problems is:

[0005] The pressure-resistant cylinder structure with external spring opening and closing includes a cylinder body, a top cover plate and a support panel. The annular support panel is fixed on the top of the cylinder body. The top cover plate is attached to the top cover plate with a preset pressure. A sealing ring is provided between the top cover plate and the support panel. The three constitute a sealed cavity structure; the characteristics are:

[0006] It also includes a rotating shaft structure, a clamping frame, a locking structure, a spring assembly, and a connecting rod. The rotating shaft structure is fixedly arranged on one side of the cylinder, and a horizontal rotating shaft is arranged inside the rotating shaft structure; one end of the connecting rod is fixedly arranged on the top cover plate, the middle part of the connecting rod is rotatably connected to the rotating shaft, the other end of the connecting rod is connected to the top of the spring assembly, and the bottom of the spring assembly is fixed to the side wall of the cylinder; one end of the clamping frame is rotatably connected to the rotating shaft, the middle part of the clamping frame is located on the upper part of the top cover plate, and the other end of the clamping frame is fixed to the side wall of the cylinder through the locking structure; when the locking structure is locked, the middle part of the clamping frame fits against the top of the top cover plate with a set pressure.

[0007] According to the above technical solution, a pressure relief structure is provided on the top cover plate.

[0008] According to the above technical solution, the pressure relief structure includes a cup-shaped pipe joint and a relief bolt. The cup-shaped pipe joint is fixed on the top cover plate, and a threaded hole connecting the top space and the bottom space of the top cover plate is provided on the cup-shaped pipe joint; the size and shape of the relief bolt match the threaded hole; when the relief bolt is tightened and loosened, the sealing state and the pressure relief state of the cylinder structure correspond.

[0009] According to the above technical scheme, the locking structure includes a locking support fixed on the side wall of the cylinder away from the rotating shaft, a hinged screw with one end rotatably connected to the locking support, and a ring nut threadedly connected to the other end of the hinged screw; a U-shaped groove is provided at the end where the clamping frame is connected to the locking structure, and the U-shaped groove is located on the rotation trajectory of the hinged screw; after the hinged screw rotates into the U-shaped groove, the ring nut is pressed into the U-shaped groove.

[0010] According to the above technical solution, the spring assembly includes a first connecting part, a second connecting part, and a spring. One end of the first connecting part is slidably connected to one end of the second connecting part, and the spring is located between the two. The other ends of the first connecting part and the second connecting part are respectively rotatably connected to the side wall of the cylinder and the connecting rod, and the rotation center lines are parallel; when the top cover plate is in a tightened state, the spring is in a tensioned or compressed state.

[0011] According to the above technical scheme, the spring assembly includes a sleeve, a core shaft, a spring, a fixed rod and a connecting seat; the top end of the core shaft is slidably connected to the bottom end of the sleeve, and the bottom end of the core shaft and the top end of the sleeve are fixedly connected to the connecting seat, and the connecting seat is rotatably connected to the connecting rod or the side wall of the cylinder body respectively; a first support plate is fixedly provided at the bottom end of the side wall of the sleeve, and a second support plate is slidably connected to the upper part of the sleeve, and the second support plate is fixed to the connecting seat at the bottom end of the core shaft by a fixed rod parallel to the sleeve, and the spring is arranged between the first support plate and the second support plate.

[0012] According to the above technical solution, the rotating shaft structure includes a rotating shaft and a rotating shaft seat, the two rotating shaft seats are fixed on the side walls of the cylinder, and the two ends of the rotating shaft are fixed between the two rotating shaft seats; the plane where the rotating shaft is located is not lower than the plane where the supporting panel is located; at least two connecting rods are arranged, and the connecting rod adopts a V-shaped structure with an opening facing upward, and the bottom end rotating shaft of the V-shaped structure is connected to the rotating shaft, one side is fixedly connected to the top cover plate, and the other side is rotatably connected to the spring assembly.

[0013] According to the above technical solution, the clamping frame adopts a tripod structure, and the clamping frame includes a clamping block located in the middle, and three support rods welded to the clamping block, wherein one end of two of the support rods are welded to the clamping block, and the other ends of the two support rods are rotatably connected to the rotating shaft; one end of the remaining support rod is welded to the clamping block, and the other end of the remaining support rod is connected to the locking structure; the clamping block is located at the top center of the top cover plate.

[0014] According to the above technical solution, a clamping block is arranged above the top center of the top cover plate, and a protrusion is provided at the top center of the top cover plate; a rubber buffer pad matching the protrusion is provided at the bottom of the clamping block; a U-shaped bracket is also provided on the top cover plate, and the U-shaped bracket is fixed upside down on the top cover plate and forms an annular hole with the top cover plate, and the remaining straight rod of the clamping frame passes through the annular hole.

[0015] According to the above technical solution, the cylinder and the support panel are connected by corner welds; an annular mounting groove is provided on the bottom outer ring of the top cover plate; it also includes a sealing ring clamping ring, the sealing ring and the sealing ring clamping ring are sequentially arranged in the annular mounting groove, and the sealing ring clamping ring is fixed to the top cover plate by bolts.

[0016] The present invention has the following beneficial effects:

[0017] 1. A rotating shaft is arranged on one side of the cylinder, and a connecting rod is rotatably connected to the rotating shaft; the spring assembly and the top cover plate are on both sides of the connecting rod, and together with the connecting rod, they form a lever structure with the rotating shaft as the fulcrum. In addition, a pressing frame is arranged on the top of the top cover plate, one end of the pressing frame is hinged on the rotating shaft, and the other end is fixed to the side wall on the other side of the cylinder through a locking structure, and the top cover plate is pressed against the supporting panel of the cylinder through the pressing frame to achieve sealing of the cylinder.

[0018] Based on the above structure, when the locking structure fixes the side of the pressing frame away from the rotating shaft to the cylinder, the middle part of the pressing frame seals the cylinder structure by squeezing the top cover plate, and the various components used to seal the top cover plate and the support panel are located outside the cylinder to avoid occupying the internal space of the cylinder structure. When the side of the pressing frame away from the rotating shaft is ready to be fixed to the cylinder or detached from the cylinder, the spring assembly exerts force on the other end of the lever structure to prevent the top cover from suddenly falling and injuring the operator when it is closed, or to achieve the effect of saving effort when opening the top cover.

[0019] 2. A pressure relief structure is provided on the top cover plate to deal with the situation where the cylinder structure is in a large positive pressure state or negative pressure state, which makes it difficult to open the top cover plate or the locking structure.

[0020] 3. Matching pressing blocks and protrusions are provided on the pressing frame and the top cover plate, and a rubber buffer pad is provided at the bottom of the pressing block, which ensures that the pressing block presses the top cover plate tightly against the supporting surface at the top of the cylinder while preventing the pressing block from damaging the top cover plate.

[0021] 4. The top cover plate is provided with a U-shaped bracket. When the locking structure fixes the pressing frame, the top cover plate can be opened by flipping the pressing frame.

[0022] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. The specific implementation of the present invention is given in detail by the following embodiments and their accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings described herein are used to provide further understanding of the present invention and constitute a part of this application. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0024] Figure 1 is a front cross-sectional view of an embodiment provided by the present invention;

[0025] Figure 2 is a top view of an embodiment provided by the present invention;

[0026] Figure 3 yes Figure 2 Sectional view of AA in the middle;

[0027] Figure 4 is a top view of a support panel on a cylinder according to an embodiment of the present invention;

[0028] Figure 5 yes Figure 4 Cross-sectional view of the middle BB;

[0029] In the figure, 1, cylinder; 2, top cover plate; 3, support panel; 4, shaft structure; 4-1, shaft; 4-2, shaft seat; 5, clamping frame; 5-1, clamping block; 5-2, support rod; 6, locking structure; 6-1, locking support; 6-2, articulated screw; 6-3, ring nut; 7, spring assembly; 7-1, sleeve; 7-2, core shaft; 7-3, spring; 7-4, fixing rod; 7-5, connecting seat; 7-6, first supporting plate; 7-7, second supporting plate; 7-8, spring assembly mounting seat; 8, connecting rod; 9, pressure relief structure; 9-1, cup-shaped pipe joint; 9-2, relief bolt; 10, sealing ring clamping ring; 11, sealing ring; 12, U-shaped notch; 13, U-shaped bracket. DETAILED DESCRIPTION

[0030] The following is combined with Figure 1-5 The principles and features of the present invention are described, and the examples are only used to explain the present invention and are not used to limit the scope of the present invention. In the following paragraphs, the present invention is described in more detail by way of example with reference to the accompanying drawings. The advantages and features of the present invention will become clearer according to the following description and claims. It should be noted that the drawings are all in a very simplified form and are not in precise proportions, and are only used to facilitate and clearly assist in explaining the purpose of the embodiments of the present invention.

[0031] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a component centered. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may also be a component centered. When a component is considered to be "set on" another component, it may be directly set on the other component or there may also be a component centered. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0033] Reference Figure 1 to Figure 5 As shown, the present invention provides an external spring-opened and closed pressure-resistant cylinder structure.

[0034] Example 1

[0035] It includes a cylinder 1, a top cover plate 2 and a support panel 3. The annular support panel is fixed on the top of the cylinder. The top cover plate is attached to the top cover plate with a preset pressure. A sealing ring 11 is provided between the top cover plate and the support panel. The three constitute a sealed cavity structure. A stiffening rib is provided between the bottom of the support panel and the outer wall of the cylinder to improve the fixing strength of the support panel on the top of the cylinder.

[0036] It also includes a rotating shaft structure 4, a clamping frame 5, a locking structure 6, a spring assembly 7, and a connecting rod 8. The rotating shaft structure is fixedly arranged on one side of the cylinder, and a horizontal rotating shaft is arranged inside the rotating shaft structure; one end of the connecting rod is fixedly arranged on the top cover plate, the middle part of the connecting rod is rotatably connected to the rotating shaft, the other end of the connecting rod is connected to the top of the spring assembly, and the bottom of the spring assembly is fixed to the side wall of the cylinder; one end of the clamping frame is rotatably connected to the rotating shaft, the middle part of the clamping frame is located on the upper part of the top cover plate, and the other end of the clamping frame is fixed to the side wall of the cylinder through the locking structure; when the locking structure is locked, the middle part of the clamping frame fits against the top of the top cover plate with a set pressure.

[0037] In this embodiment, a rotating shaft is provided on one side of the cylinder, and a connecting rod is rotatably connected to the rotating shaft; the spring assembly and the top cover plate are on both sides of the connecting rod, and together with the connecting rod, a lever structure with the rotating shaft as a fulcrum is formed. In addition, a pressing frame is provided on the top of the top cover plate, one end of the pressing frame is hinged on the rotating shaft, and the other end is fixed to the side wall on the other side of the cylinder through a locking structure, and the top cover plate is pressed against the supporting panel of the cylinder through the pressing frame to achieve sealing of the cylinder.

[0038] Based on the above structure, when the locking structure fixes the side of the pressing frame away from the rotating shaft to the cylinder, the middle part of the pressing frame compresses the top cover plate to achieve the sealing of the cylinder structure while avoiding the occupation of the internal space of the cylinder structure. When the side of the pressing frame away from the rotating shaft is ready to be fixed to the cylinder or detached from the cylinder, the spring assembly exerts force on the other end of the lever structure, thereby preventing the top cover from suddenly falling and injuring the operator when closing, or achieving the effect of saving effort when opening the top cover.

[0039] Example 2

[0040] The structure and principle of Example 2 are similar to those of Example 1, except that a pressure relief structure 9 is provided on the top cover plate to cope with the situation where the cylinder structure is in a large positive pressure state or negative pressure state, which makes it difficult to open the top cover plate or the locking structure.

[0041] A preferred pressure relief structure is provided, which includes a cup-shaped pipe joint 9-1 and a relief bolt 9-2. The cup-shaped pipe joint is fixed on the top cover plate, and a threaded hole connecting the top space and the bottom space of the top cover plate is provided on the cup-shaped pipe joint; the size and shape of the relief bolt match the threaded hole; when the relief bolt is tightened and loosened, the sealing state and the pressure relief state of the cylinder structure correspond. Other forms of pressure relief structures can also be used, and the pressure relief operation can be completed only when the cylinder is in a state of relatively large positive pressure or negative pressure.

[0042] During normal use, the relief nut is in a tightened state. If negative pressure or positive pressure is generated in the internal space of the pressure cylinder during use, it will make the top cover difficult to open or suddenly collapse. At this time, before opening the top cover, you need to loosen the relief nut first to allow the atmospheric pressure inside and outside the cylinder to reach equilibrium before opening the top cover.

[0043] Example 3

[0044] The structure and principle of Example 3 are similar to those of Example 1 or 2, except that: a preferred locking structure is provided, the locking structure includes a locking support 6-1 fixed on the side wall of the cylinder away from the rotating shaft, a hinge screw 6-2 with one end rotatably connected to the locking support, and a ring nut 6-3 threadedly connected to the other end of the hinge screw; a U-shaped slot 12 is provided at the end where the clamping frame is connected to the locking structure, and the U-shaped slot is located on the rotation track of the hinge screw; after the hinge screw rotates into the U-shaped slot, the ring nut is pressed into the U-shaped slot. The locking support is fixed to the side wall of the cylinder by welding, and the bottom end of the hinge screw is rotatably connected to the locking support through the rotating shaft.

[0045] When the top cover is closed, the sealing ring contacts the support panel; flip the articulated screw into the U-shaped slot, and when the ring nut at the end of the articulated bolt is rotated, the clamping frame can press the top cover, so that the sealing ring and the support panel are squeezed to achieve a sealing effect.

[0046] In addition to the locking structure described in this embodiment, other forms of locking structures may also be used, as long as the pressing frame is pressed downward to achieve a tight fit between the top cover plate and the support panel.

[0047] In Examples 1-3, the spring assembly includes a first connecting part, a second connecting part, and a spring. One end of the first connecting part is slidably connected to one end of the second connecting part, and the spring is located between the two. The other ends of the first connecting part and the second connecting part are respectively rotatably connected to the side wall of the cylinder and the connecting rod, and the rotation center lines are parallel; when the top cover plate is in a tightened state, the spring is in a tensioned or compressed state.

[0048] Based on this, a preferred structural form of the spring assembly is provided, wherein the spring is in a compressed state.

[0049] Specifically, the spring assembly includes a sleeve 7-1, a core shaft 7-2, a spring 7-3, a fixed rod 7-4 and a connecting seat 7-5; the top end of the core shaft is slidably connected to the bottom end of the sleeve, and the bottom end of the core shaft and the top end of the sleeve are fixedly connected to the connecting seat, and the connecting seat is rotatably connected to the connecting rod or the side wall of the cylinder body respectively; a first support plate 7-6 is fixedly provided at the bottom end of the sleeve side wall, and a second support plate 7-7 is slidably connected to the upper part of the sleeve, and the second support plate is fixed to the connecting seat at the bottom end of the core shaft through a fixed rod parallel to the sleeve, and the spring is arranged between the first support plate and the second support plate. The embodiment in the figure has a spring assembly mounting seat 7-8 on the side wall, and the connecting seat at the end of the core shaft is rotatably connected to the spring assembly mounting seat

[0050] In this embodiment, during the process of closing the top cover, the sleeve or core shaft connected to the connecting rod through the support seat is pulled and moved upward, so that the spring located between the two support plates is compressed and is in a compressed state; thereby achieving the effect of saving effort when opening the top cover and preventing the top cover from suddenly falling and injuring the operator when closing.

[0051] In the above-mentioned embodiments, the rotating shaft structure includes a rotating shaft 4-1 and a rotating shaft seat 4-2, the two rotating shaft seats are fixed on the side wall of the cylinder, and the two ends of the rotating shaft are fixed between the two rotating shaft seats; preferably, the plane where the rotating shaft is located is not lower than the plane where the supporting panel is located.

[0052] Of course, the plane where the rotating shaft is located may also be lower than the plane where the supporting panel is located, but it will only cause the sizes of various components at the rotating shaft to become larger.

[0053] In order to ensure the connection strength of the top cover plate on the rotating shaft, at least two connecting rods are provided.

[0054] Preferably, the connecting rod adopts a V-shaped structure with an opening facing upward, the bottom end of the V-shaped structure is connected to the rotating shaft, one side is fixedly connected to the top cover plate, and the other side is rotatably connected to the spring assembly.

[0055] Example 4

[0056] The structure and principle of Example 4 are similar to those of Examples 1-3, and are characterized in that: the clamping frame adopts a tripod structure, and the clamping frame includes a clamping block 5-1 located in the middle, and three support rods 5-2 welded to the clamping block, wherein one end of two of the support rods are welded to the clamping block, and the other ends of the two support rods are rotatably connected to the rotating shaft; one end of the remaining support rod is welded to the clamping block, and the other end of the remaining support rod is connected to the locking structure; the clamping block is located at the top center of the top cover plate.

[0057] In order to ensure that the pressing block presses the top cover plate tightly against the supporting surface at the top of the cylinder body and avoid damage to the top cover plate by the pressing block; the pressing block is arranged above the top center of the top cover plate, and a protrusion is arranged at the top center of the top cover plate; a rubber buffer pad matching the protrusion is arranged at the bottom of the pressing block; in addition, in order to facilitate the opening of the top cover plate, a U-shaped bracket 13 is also arranged on the top cover plate, and the U-shaped bracket is fixed on the top cover plate upside down, and forms an annular hole with the top cover plate, and the remaining straight rod of the pressing frame passes through the annular hole. When the locking structure releases the fixing of the pressing frame, the top cover plate is opened by flipping the pressing frame.

[0058] In the above-mentioned various embodiments, the cylinder and the support panel are connected by fillet welds; an annular mounting groove is provided on the bottom outer ring of the top cover plate, and the mounting groove is divided into an inner groove and an outer groove; a sealing ring clamping ring 10 is also provided, and the sealing ring and the sealing ring clamping ring are arranged in the annular mounting groove in sequence, the sealing ring is placed in the inner groove, the sealing ring clamping ring is placed in the outer groove, and the sealing ring clamping ring is fixed to the top cover plate by bolts. In this embodiment, the sealing ring is limited in the annular mounting groove by the sealing ring clamping ring, so that the sealing ring is installed on the top cover plate; in addition, the sealing ring clamping ring is fixed to the outer groove of the annular mounting groove by bolts, so that the sealing ring is detachably installed on the top cover plate, which is convenient for the subsequent replacement of the sealing ring.

[0059] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any ordinary technician in the industry can smoothly implement the present invention as shown in the drawings and described above. However, any equivalent changes, modifications and evolutions made by technicians familiar with the profession without departing from the scope of the technical solution of the present invention using the technical content disclosed above are all equivalent embodiments of the present invention. At the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essential technology of the present invention are still within the protection scope of the technical solution of the present invention.

Claims

1. The pressure-resistant cylinder structure with external spring opening and closing includes a cylinder, a top cover plate and a support panel. The annular support panel is fixed on the top of the cylinder. The top cover plate is attached to the top cover plate with a preset pressure. A sealing ring is provided between the top cover plate and the support panel. The three constitute a sealed cavity structure; the characteristics are: It also includes a rotating shaft structure, a clamping frame, a locking structure, a spring assembly, and a connecting rod. The rotating shaft structure is fixedly arranged on one side of the cylinder, and a horizontal rotating shaft is arranged inside the rotating shaft structure; one end of the connecting rod is fixedly arranged on the top cover plate, the middle part of the connecting rod is rotatably connected to the rotating shaft, the other end of the connecting rod is connected to the top of the spring assembly, and the bottom of the spring assembly is fixed to the side wall of the cylinder; one end of the clamping frame is rotatably connected to the rotating shaft, the middle part of the clamping frame is located on the upper part of the top cover plate, and the other end of the clamping frame is fixed to the side wall of the cylinder through the locking structure; when the locking structure is locked, the middle part of the clamping frame fits against the top of the top cover plate with a set pressure.

2. The pressure-resistant cylinder structure with external spring opening and closing according to claim 1 is characterized in that: A pressure relief structure is arranged on the top cover plate.

3. The pressure-resistant cylinder structure with external spring opening and closing according to claim 2 is characterized in that: The pressure relief structure includes a cup-shaped pipe joint and a relief bolt. The cup-shaped pipe joint is fixed on the top cover plate, and a threaded hole connecting the top space and the bottom space of the top cover plate is provided on the cup-shaped pipe joint. The size and shape of the relief bolt match the threaded hole. When the relief bolt is tightened and loosened, the sealing state and the pressure relief state of the cylinder structure correspond.

4. The pressure-resistant cylinder structure with external spring opening and closing according to claim 1 is characterized in that: The locking structure includes a locking support fixed on the side wall of the cylinder away from the rotating shaft, a hinged screw with one end rotatably connected to the locking support, and a ring nut threadedly connected to the other end of the hinged screw; a U-shaped groove is provided at the end where the clamping frame is connected to the locking structure, and the U-shaped groove is located on the rotation trajectory of the hinged screw; after the hinged screw rotates into the U-shaped groove, the ring nut is pressed into the U-shaped groove.

5. The pressure-resistant cylinder structure with external spring opening and closing according to claim 1 is characterized in that: The spring assembly includes a first connecting part, a second connecting part, and a spring. One end of the first connecting part is slidably connected to one end of the second connecting part, and the spring is located between the two. The other ends of the first connecting part and the second connecting part are respectively rotatably connected to the side wall of the cylinder and the connecting rod, and the rotation center lines are parallel. When the top cover plate is in a tightened state, the spring is in a tensioned or compressed state.

6. The pressure-resistant cylinder structure with external spring opening and closing according to claim 1 or 5, characterized in that: The spring assembly includes a sleeve, a core shaft, a spring, a fixed rod and a connecting seat; the top end of the core shaft is slidably connected to the bottom end of the sleeve, the bottom end of the core shaft and the top end of the sleeve are fixedly connected to the connecting seat, and the connecting seat is rotatably connected to the connecting rod or the side wall of the cylinder body respectively; a first support plate is fixedly provided at the bottom end of the side wall of the sleeve, and a second support plate is slidably connected to the upper part of the sleeve, and the second support plate is fixed to the connecting seat at the bottom end of the core shaft by a fixed rod parallel to the sleeve, and the spring is arranged between the first support plate and the second support plate.

7. The pressure-resistant cylinder structure with external spring opening and closing according to claim 1 is characterized in that: The rotating shaft structure includes a rotating shaft and a rotating shaft seat, the two rotating shaft seats are fixed on the side walls of the cylinder, and the two ends of the rotating shaft are fixed between the two rotating shaft seats; the plane where the rotating shaft is located is not lower than the plane where the supporting panel is located; at least two connecting rods are arranged, and the connecting rod adopts a V-shaped structure with an opening facing upward. The bottom end rotating shaft of the V-shaped structure is connected to the rotating shaft, one side is fixedly connected to the top cover plate, and the other side is rotatably connected to the spring assembly.

8. The pressure-resistant cylinder structure with external spring opening and closing according to claim 1 or 4, characterized in that: The clamping frame adopts a tripod structure, and the clamping frame includes a clamping block located in the middle, and three support rods welded to the clamping block, wherein one end of two of the support rods are welded to the clamping block, and the other ends of the two support rods are rotatably connected to the rotating shaft; one end of the remaining support rod is welded to the clamping block, and the other end of the remaining support rod is connected to the locking structure; the clamping block is located at the top center of the top cover plate.

9. The pressure-resistant cylinder structure with external spring opening and closing according to claim 8 is characterized in that: A clamping block is arranged above the top center of the top cover plate, and a protrusion is provided at the top center of the top cover plate; a rubber buffer pad matching the protrusion is provided at the bottom of the clamping block; a U-shaped bracket is also provided on the top cover plate, the U-shaped bracket is fixed upside down on the top cover plate, and forms an annular hole with the top cover plate, and the remaining straight rod of the clamping frame passes through the annular hole.

10. The pressure-resistant cylinder structure with external spring opening and closing according to claim 1 is characterized in that: The cylinder body and the supporting panel are connected by a fillet weld; an annular mounting groove is provided on the bottom outer ring of the top cover plate; it also includes a sealing ring clamping ring, the sealing ring and the sealing ring clamping ring are sequentially arranged in the annular mounting groove, and the sealing ring clamping ring is fixed to the top cover plate by bolts.

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