Safety lock for pressure-bearing equipment and pressure-bearing equipment

Abstract

The present invention provides a safety lock for pressure-bearing equipment and the pressure-bearing equipment, which relate to the technical field of locking equipment, include a core body, a piston rod and an outer shell, and a threaded joint is provided at the end of the core body; a rod-penetrating cavity, a pressure-bearing cavity and a pressure-inducing hole are provided in the core body, and a core wrench hole is provided on the outer wall of the rod-penetrating cavity along its radial direction, one end of the pressure-inducing hole is connected with the pressure-bearing cavity, and the other end extends to the end face of the threaded joint; the piston rod is passed through the rod-penetrating cavity and the pressure-bearing cavity, the piston on the piston rod is located in the pressure-bearing cavity, and the top of the piston rod is provided with a piston wrench hole along its radial direction; the outer shell is sleeved on the outside of the core body, the top end of the outer shell is rotatably connected to the top end of the piston rod, and an axial limiting element is also provided at the connection position; the outer shell wrench hole is provided on the top side wall of the outer shell; the present invention ensures that the protected element cannot be removed or moved when there is pressure in the pressure-bearing equipment, thereby avoiding the possibility of the protected element being opened by mistake.

Description

Technical Field

[0001] The present invention relates to the technical field of locking equipment, and in particular to a safety lock for pressure-bearing equipment and the pressure-bearing equipment. Background Art

[0002] When pressure-bearing equipment is used, other opening and closing components are often required. For example, in the chemical industry, some pressure-bearing equipment is equipped with quick-opening blind plates. For safe operation, an interlocking mechanism is installed on the blind plate. The most common interlocking mechanism is mechanical, generally consisting of a limiter and a locking member for the limiter. Without removing the interlocking mechanism, the blind plate cannot be opened. However, the locking member of the traditional interlocking mechanism can still be removed using a wrench or screwing tool while the pressure-bearing equipment is under pressure, causing the interlocking device to fail and thus leading to a safety accident involving the quick-opening blind plate. Summary of the Invention

[0003] The purpose of the present invention is to provide a safety lock for pressure-bearing equipment and pressure-bearing equipment to solve the problems existing in the above-mentioned prior art, ensuring that the protected element cannot be removed or moved when there is pressure in the pressure-bearing equipment, thereby avoiding the possibility of the protected element being accidentally opened.

[0004] To achieve the above object, the present invention provides the following solutions:

[0005] A safety lock for pressure-bearing equipment, wherein a threaded hole communicating with a pressure chamber of the pressure-bearing equipment is provided on an outer wall of the pressure-bearing equipment, a protected element extends to the position of the threaded hole, and a through hole facing the threaded hole is provided on the protected element; the safety lock comprises:

[0006] A core body, wherein the end of the core body is provided with a threaded joint for screwing into the threaded hole; from top to bottom, the core body is provided with a rod-penetrating cavity, a pressure-bearing cavity and a pressure-inducing hole which are connected in sequence; a core body wrench hole is provided on the outer wall of the rod-penetrating cavity along its radial direction; one end of the pressure-inducing hole is connected to the pressure-bearing cavity, and the other end extends to the end face of the threaded joint; an anti-slip limit portion is provided on the outer wall of the core body for preventing the protected element from slipping out;

[0007] A piston rod, the piston rod being inserted into the rod-penetrating cavity and the pressure-bearing cavity, the piston on the piston rod being located in the pressure-bearing cavity, a stroke limiter for limiting the upper limit of the piston stroke being provided at the connection position between the rod-penetrating cavity and the pressure-bearing cavity, the circumferential wall surface of the piston abutting against the inner wall surface of the pressure-bearing cavity; a piston wrench hole being provided at the top of the piston rod along its radial direction;

[0008] and a shell, the shell being sleeved on the outside of the core, the top end of the shell being rotatably connected to the top end of the piston rod, and an axial limiting element being further provided at the connection position; a shell wrench hole being provided on the top side wall of the shell;

[0009] When the piston is at the lower limit of the stroke, the shell wrench hole, the core wrench hole and the piston wrench hole are opposite to each other, and a wrench can be inserted to screw the core; when the piston is at the upper limit of the stroke, the shell wrench hole and the piston wrench hole are staggered with the core wrench hole.

[0010] As one embodiment, from top to bottom, the rod penetration cavity includes a first rod penetration cavity and a second rod penetration cavity that are connected, the second rod penetration cavity is connected to the pressure-bearing cavity, the diameter of the second rod penetration cavity is smaller than that of the pressure-bearing cavity, and a core wrench hole is provided on the outer wall of the first rod penetration cavity.

[0011] As one embodiment, the first rod penetration cavity and the second rod penetration cavity are connected by a reduced diameter section having a diameter smaller than that of the first and second rod penetration cavities; a compression spring is sleeved on the piston rod, one end of the compression spring is connected to the top wall of the second rod penetration cavity, and the other end is connected to the piston.

[0012] As an embodiment, the piston rod is provided with a large diameter section, the diameter of the large diameter section is larger than the diameter of the reduced diameter section; the piston wrench hole is radially provided on the large diameter section.

[0013] As one embodiment, an annular groove is provided on the circumferential wall surface of the piston, and a sealing ring is embedded in the annular groove.

[0014] As one embodiment, a mounting hole is provided on the top end cover of the shell, the top end of the piston rod has a small diameter section, the small diameter section passes through the mounting hole, and a retaining ring with a diameter larger than the mounting hole is fixed to the top end of the small diameter section.

[0015] As an embodiment, a cylindrical retaining ring is further included, which is used to be fixed on the protected element. The retaining ring is sleeved on the outside of the shell, and the axial length of the retaining ring is greater than the stroke of the piston rod in the core.

[0016] As one embodiment, the threaded joint is further provided with a leakage hole arranged along its radial direction, one end of the leakage hole is connected to the pressure-inducing hole, and the other end extends to the outer wall surface of the threaded joint. After the threaded joint is screwed, the leakage hole is located inside the wall of the pressure-bearing equipment.

[0017] As an embodiment, the first rod penetration cavity, the second rod penetration cavity, the pressure-bearing cavity and the pressure-inducing hole are coaxially arranged.

[0018] The present invention also provides a pressure-bearing equipment, including the safety lock for the pressure-bearing equipment as described above.

[0019] Compared with the prior art, the present invention has the following technical effects:

[0020] The present invention provides a shell wrench hole, a core wrench hole and a piston wrench hole, so that the core can only be disassembled when a wrench passes through the three. During operation, the internal pressure of the pressure-bearing equipment is used to push the piston rod, and the piston rod pushes the shell to move axially, so that the shell wrench hole, the core wrench hole and the piston wrench hole are staggered, and the wrench cannot enter or exit the core, and the core cannot be disassembled by twisting the wrench with the wrench; moreover, the shell in the present invention is rotatably connected to the top of the piston rod, so as to avoid directly twisting the piston rod by rotating the shell to disassemble the core; through the above two protection structures, the core cannot be removed when there is pressure in the pressure-bearing equipment, which ensures that the protected element cannot be removed or moved when there is pressure in the pressure-bearing equipment, thereby avoiding the possibility of the protected element being accidentally opened.

[0021] Other technical solutions of the present invention have the following technical effects compared with the prior art:

[0022] The present invention provides a retaining ring sleeved on the outside of the shell. Even if the shell is lifted to the highest position, the core body will not be exposed from the retaining ring, and no space will be provided for other tools to install the core body, thereby preventing the safety lock from being disassembled under pressure.

[0023] The present invention provides an air leakage hole on the threaded joint, so that it can be observed whether the pressure-bearing equipment is completely depressurized, thereby avoiding accidents caused by medium leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 This is a schematic structural diagram of a safety lock for pressure-bearing equipment in an embodiment of the present invention when there is no pressure inside the pressure-bearing equipment;

[0026] Figure 2 This is a schematic structural diagram of a safety lock for pressure-bearing equipment in one embodiment of the present invention when there is pressure inside the pressure-bearing equipment;

[0027] Figure 3 This is a schematic diagram of the matching structure of the core and the piston rod in one embodiment of the present invention;

[0028] Figure 4This is a schematic structural diagram of a housing in one embodiment of the present invention;

[0029] Figure 5 This is a schematic diagram of the connection structure between the housing and the piston rod in one embodiment of the present invention;

[0030] Figure 6 Schematic diagram of the partial structure of the core in one embodiment of the present invention.

[0031] Description of reference numerals:

[0032] 1. Housing; 2. Housing wrench hole; 3. Wrench; 4. Core wrench hole; 5. Core; 6. Compression spring; 7. Sealing ring; 8. Retaining ring; 9. Threaded joint; 10. Piston wrench hole; 11. Piston rod; 12. Pressure-bearing chamber; 13. Pressure-inducing hole; 14. Protected component; 15. Threaded hole; 16. Pressure-bearing equipment; 17. First rod-penetrating chamber; 18. Second rod-penetrating chamber; 19. Reduced diameter section; 20. Large diameter section; 21. Mounting hole; 22. Small diameter section; 23. Retaining ring; 24. Leakage hole. DETAILED DESCRIPTION

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0034] The purpose of the present invention is to provide a safety lock for pressure-bearing equipment and pressure-bearing equipment to solve the problems existing in the prior art, ensuring that the protected element cannot be removed or moved when there is pressure in the pressure-bearing equipment, thereby avoiding the possibility of the protected element being accidentally opened.

[0035] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] Example 1:

[0037] like Figures 1 to 6As shown, this embodiment provides a safety lock for a pressure-bearing device 16. The pressure-bearing device 16 can be a pressure tank or a pressure pipe. A threaded hole 15 is provided on the outer wall of the pressure-bearing device 16, which is connected to its pressure chamber. If the wall of the pressure-bearing device 16 does not have a threaded hole 15, a threaded hole 15 needs to be processed. The protected element 14 extends to the position of the threaded hole 15. The protected element 14 is provided with a through hole that is opposite to the threaded hole 15. The protected element 14 can be an opening handle of a valve body, or an opening handle of a blind plate, etc. If the opening handle of the valve or blind plate cannot extend to the threaded hole 15, a connecting plate can be welded on the opening handle so that the connecting plate can extend to the threaded hole 15. The safety lock in this embodiment is intended to control the protected element 14 to be fixed or unable to be removed. The protected element 14 can be moved or removed only after the safety lock is removed.

[0038] The safety lock includes a core body 5, a piston rod 11 and a shell 1. The end of the core body 5 is provided with a threaded joint 9 for screwing into the threaded hole 15; from top to bottom, the core body 5 is provided with a rod-penetrating cavity, a pressure-bearing cavity 12 and a pressure-inducing hole 13 that are connected in sequence, and a core wrench hole 4 is provided on the outer wall of the rod-penetrating cavity along its radial direction; one end of the pressure-inducing hole 13 is connected to the pressure-bearing cavity 12, and the other end extends to the end face of the threaded joint 9. The outer wall of the core body 5 is provided with an anti-slip limit portion for preventing the protected element 14 from slipping out. The lower direction in this embodiment refers to the direction close to the pressure-bearing device 16, and the upper direction refers to the direction away from the pressure-bearing device 16.

[0039] The piston rod 11 is inserted into the rod-penetrating cavity and the pressure-bearing cavity 12. The piston on the piston rod 11 is located in the pressure-bearing cavity 12 and can move axially in the pressure-bearing cavity 12. The connection position between the rod-penetrating cavity and the pressure-bearing cavity 12 is provided with a stroke limiter for limiting the upper limit position of the piston stroke. The stroke limiter can be a step structure formed at the connection position between the rod-penetrating cavity and the pressure-bearing cavity 12. The circumferential wall surface of the piston abuts against the inner wall surface of the pressure-bearing cavity 12; the top of the piston rod 11 is provided with a piston wrench hole 10 along its radial direction. The outer shell 1 is sleeved on the outside of the core 5. The outer shell 1 can be cylindrical. The top end of the outer shell 1 is rotatably connected to the top end of the piston rod 11. The connection position is also provided with an axial limiter; the top side wall of the outer shell 1 is provided with an outer shell wrench hole 2.

[0040] When in use, the piston is at the lower limit of the stroke, the shell wrench hole 2, the core wrench hole 4 and the piston wrench hole 10 are opposite (the core 5 and the piston will not rotate relative to each other, for example, the radial cross-sections of the piston and the pressure-bearing chamber 12 are both set to be square; the core wrench hole 4 and the piston wrench hole 10 are opposite. If the shell wrench hole 2 is not opposite to the core wrench hole 4, the shell 1 can be manually rotated so that the shell wrench hole 2 and the core wrench hole 4 are opposite), and then the rod-shaped wrench 3 is inserted into the shell wrench hole 2, the core wrench hole 4 and The piston wrench hole 10 is used to screw the core body 5 with the wrench 3, and the core body 5 is passed through the protected element 14 and fixed in the threaded hole 15 on the pressure-bearing equipment 16. The diameter of the anti-slip limit part is larger than the diameter of the through hole on the protected element 14, which can prevent the protected element 14 from falling off from the core body 5. In actual use, the anti-slip limit part can be a step structure set on the outer wall of the core body 5. This step structure is used to press the protected element 14 onto the pressure-bearing equipment 16 to achieve fixed locking of the protected element 14. After high-pressure medium is introduced into the pressure-bearing device 16, it can enter the pressure-bearing chamber 12 through the pressure-introducing hole 13. Under the pressure of the high-pressure medium, the piston is pushed to the upper limit of its stroke. When the piston is at the upper limit of its stroke, the piston rod 11 lifts the housing 1. The housing wrench hole 2 and the piston wrench hole 10 are staggered with the core wrench hole 4. The wrench 3 cannot pass from the housing wrench hole 2 into the core wrench hole 4 and the piston wrench hole 10, thereby preventing the core 5 from being removed using the wrench 3. This ensures that the core 5 will not be removed while the pressure-bearing device 16 is under pressure. Because the housing 1 and the top end of the piston rod 11 are connected to rotate about the axial direction of the piston rod 11 in this embodiment, even if the housing 1 is clamped and fixed with other tools (such as calipers), the piston rod 11 or the core 5 cannot be rotated by rotating the housing 1. Consequently, the core 5 cannot be removed by applying force to the housing 1 using tools, further preventing the core 5 from being removed. When the pressure in the pressure-bearing device 16 is relieved, the pressure in the pressure-bearing chamber 12 decreases, allowing the piston rod 11 to retract to the lower limit of its stroke. The housing wrench hole 2 and the piston wrench hole 10 can be realigned with the core wrench hole 4, and the core 5 can be removed using the wrench 3. The force that causes the piston rod 11 to retract can be the weight of the piston rod 11 and the housing 1, a restoring force applied by a worker to the piston rod 11, or a restoring force applied by other structures to the piston rod 11.

[0041] Therefore, this embodiment can provide the shell wrench hole 2, the core wrench hole 4 and the piston wrench hole 10, so that the core 5 can be disassembled only when the wrench 3 passes through the three. During operation, the internal pressure of the pressure-bearing device 16 is used to push the piston rod 11, and the piston rod 11 is used to push the shell 1 to move axially, so that the shell wrench hole 2, the core wrench hole 4 and the piston wrench hole 10 are staggered, and the wrench cannot be inserted into the core 5, and the core 5 cannot be disassembled by screwing the wrench 3; and, the shell 1 in this embodiment is rotatably connected to the top of the piston rod 11, so as to avoid directly screwing the piston rod 11 by rotating the shell 1 to disassemble the core 5; through the above two protective structures, the core 5 cannot be removed when there is pressure in the pressure-bearing device 16, thereby ensuring that the protected element 14 cannot be removed or moved when there is pressure in the pressure-bearing device 16, thereby avoiding the possibility of the protected element 14 being accidentally opened.

[0042] In this embodiment, from top to bottom, the rod-penetrating cavity includes a first rod-penetrating cavity 17 and a second rod-penetrating cavity 18, which are connected to the pressure-bearing cavity 12. The diameter of the second rod-penetrating cavity 18 is smaller than that of the pressure-bearing cavity 12. The outer wall of the first rod-penetrating cavity 17 is provided with a core wrench hole 4. Because the diameter of the second rod-penetrating cavity 18 is smaller than that of the pressure-bearing cavity 12, a step structure is formed at the junction of the top of the pressure-bearing cavity 12 and the bottom of the second rod-penetrating cavity 18, which can prevent the piston from moving upward and form the upper limit of the piston's travel.

[0043] In this embodiment, the first rod penetration cavity 17, the second rod penetration cavity 18, the pressure-bearing cavity 12 and the pressure-inducing hole 13 are coaxially arranged.

[0044] In this embodiment, the first through-rod cavity 17 and the second through-rod cavity 18 are connected by a reduced diameter section 19 having a smaller diameter than the first through-rod cavity 17 and the second through-rod cavity 18. A compression spring 6 is sleeved on the piston rod 11. The top end of the compression spring 6 is connected to the top wall of the second through-rod cavity 18, and the bottom end is connected to the piston. The connection between the compression spring 6 and the top wall of the second through-rod cavity 18 and the piston can be a fixed connection such as abutment or welding. By providing the compression spring 6, when the piston is not under pressure (the core 5 is not installed and the pressure-bearing device 16 is not pressurized or released), the piston is at the lower limit of its travel under the action of the compression spring 6. The housing wrench hole 2, the core wrench hole 4, and the piston wrench hole 10 are directly opposite each other, allowing the wrench 3 to be inserted.

[0045] In this embodiment, the piston's lower travel limit can be located at the bottom of the pressure-bearing chamber 12. Alternatively, in this embodiment, the piston rod 11 is provided with a large-diameter section 20, which has a larger diameter than the reduced-diameter section 19. A piston wrench hole 10 is radially provided in the large-diameter section 20. When the bottom end of the large-diameter section 20 abuts the core 5, the piston moves to the lower travel limit.

[0046] In this embodiment, an annular groove is provided on the circumferential wall surface of the piston, and a sealing ring 7 is embedded in the annular groove to ensure the sealing performance of the piston in the pressure-bearing chamber 12.

[0047] In this embodiment, a mounting hole 21 is provided on the top end cover of the outer shell 1, and the top end of the piston rod 11 has a small diameter section 22. The small diameter section 22 passes through the mounting hole 21, and the small diameter section 22 is clearance-matched with the mounting hole 21. A retaining ring 23 with a diameter larger than the mounting hole 21 is detachably fixed to the top end of the small diameter section 22 to achieve axial limitation under the premise of rotational connection between the outer shell 1 and the piston rod 11.

[0048] This embodiment also includes a cylindrical retaining ring 8, which is used to be fixed on the protected element 14, and the fixing method can be welding. The retaining ring 8 is sleeved on the outside of the shell 1, and the axial length of the retaining ring 8 is greater than the stroke of the piston rod 11 in the core 5. When the piston is at the lower limit of the stroke, the bottom end of the shell 1 and the protected element 14 are in contact or have a small gap; when the piston is at the upper limit of the stroke, the shell 1 is lifted to the highest position, but the bottom end of the shell 1 is still in the retaining ring 8. Therefore, even if the shell 1 is lifted to the highest position, the bottom end of the shell 1 will not be exposed from the retaining ring 8, that is, the core 5 will not be exposed outside the retaining ring, and no space will be provided for other tools to clamp the core 5, thereby preventing the core 5 from being disassembled under pressure.

[0049] In this embodiment, the threaded joint 9 is further provided with a leakage hole 24 arranged along its radial direction. One end of the leakage hole 24 is connected to the pressure-inducing hole 13, and the other end extends to the outer wall surface of the threaded joint 9. Preferably, the leakage hole 24 is located at the top end of the threaded joint 9 (i.e., the end away from the pressure-bearing device 16). After the threaded joint 9 is screwed, the leakage hole 24 is located in the wall of the pressure-bearing device 16, and the leakage hole 24 will not leak the medium in the pressure-bearing device 16. When the pressure-bearing device 16 is depressurized, the piston moves to the lower limit of the stroke. When the core body 5 is screwed outward with the wrench 3, after the leakage hole 24 is screwed out from the threaded hole 15, if medium leakage occurs at the leakage hole 24, it means that the pressure of the medium in the pressure-bearing device 16 on the piston is only less than the pressure of the compression spring 6 on the piston, and the pressure in the pressure-bearing device 16 has not been completely relieved. At this time, it is necessary to screw the core body 5 into the threaded hole 15, and then screw the core body 5 out after the pressure in the pressure-bearing device 16 is completely relieved. Therefore, in this embodiment, by providing the air leakage hole 24 on the threaded joint 9, it is possible to observe whether the pressure-bearing equipment 16 is completely depressurized, thereby avoiding accidents caused by medium leakage.

[0050] Example 2:

[0051] This embodiment provides a pressure-bearing device 16, including the safety lock for the pressure-bearing device 16 in Example 1.

[0052] Adaptive changes based on actual needs are all within the scope of protection of the present invention.

[0053] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A safety lock for pressure-bearing equipment, wherein a threaded hole communicating with a pressure chamber is provided on an outer wall of the pressure-bearing equipment, a protected element extends to the position of the threaded hole, and a through hole is provided on the protected element facing the threaded hole; characterized in that: The safety lock comprises: A core body, wherein the end of the core body is provided with a threaded joint for screwing into the threaded hole; from top to bottom, the core body is provided with a rod-penetrating cavity, a pressure-bearing cavity and a pressure-inducing hole which are connected in sequence; a core body wrench hole is provided on the outer wall of the rod-penetrating cavity along its radial direction; one end of the pressure-inducing hole is connected to the pressure-bearing cavity, and the other end extends to the end face of the threaded joint; an anti-slip limit portion is provided on the outer wall of the core body for preventing the protected element from slipping out; A piston rod, the piston rod being inserted into the rod-penetrating cavity and the pressure-bearing cavity, the piston on the piston rod being located in the pressure-bearing cavity, a stroke limiter for limiting the upper limit of the piston stroke being provided at the connection position between the rod-penetrating cavity and the pressure-bearing cavity, the circumferential wall surface of the piston abutting against the inner wall surface of the pressure-bearing cavity; a piston wrench hole being provided at the top of the piston rod along its radial direction; and a shell, the shell being sleeved on the outside of the core, the top end of the shell being rotatably connected to the top end of the piston rod, and an axial limiting element being further provided at the connection position; a shell wrench hole being provided on the top side wall of the shell; When the piston is at the lower limit of the stroke, the shell wrench hole, the core wrench hole and the piston wrench hole are opposite to each other, and a wrench can be inserted to screw the core; when the piston is at the upper limit of the stroke, the shell wrench hole and the piston wrench hole are staggered with the core wrench hole.

2. The safety lock for pressure-bearing equipment according to claim 1, characterized in that: From top to bottom, the rod penetration cavity includes a first rod penetration cavity and a second rod penetration cavity that are connected. The second rod penetration cavity is connected to the pressure-bearing cavity. The diameter of the second rod penetration cavity is smaller than that of the pressure-bearing cavity. A core wrench hole is provided on the outer wall of the first rod penetration cavity.

3. The safety lock for pressure-bearing equipment according to claim 2, characterized in that: The first rod penetration cavity and the second rod penetration cavity are connected through a reduced diameter section with a diameter smaller than that of the first and the second rod penetration cavity; a compression spring is sleeved on the piston rod, one end of the compression spring is connected to the top wall of the second rod penetration cavity, and the other end is connected to the piston.

4. The safety lock for pressure-bearing equipment according to claim 3, characterized in that: The piston rod is provided with a large diameter section, the diameter of which is larger than the diameter of the reduced diameter section; the piston wrench hole is radially provided on the large diameter section.

5. The safety lock for pressure-bearing equipment according to any one of claims 1 to 4, characterized in that: An annular groove is provided on the circumferential wall surface of the piston, and a sealing ring is embedded in the annular groove.

6. The safety lock for pressure-bearing equipment according to any one of claims 1 to 4, characterized in that: A mounting hole is provided on the top end cover of the shell, and the top end of the piston rod has a small diameter section that passes through the mounting hole. A retaining ring with a diameter larger than that of the mounting hole is fixed to the top end of the small diameter section.

7. The safety lock for pressure-bearing equipment according to any one of claims 1 to 4, characterized in that: It also includes a cylindrical retaining ring, which is used to be fixed on the protected element. The retaining ring is sleeved on the outside of the shell, and the axial length of the retaining ring is greater than the stroke of the piston rod in the core.

8. The safety lock for pressure-bearing equipment according to any one of claims 1 to 4, characterized in that: The threaded joint is also provided with a leakage hole arranged along its radial direction. One end of the leakage hole is connected to the pressure-inducing hole, and the other end extends to the outer wall surface of the threaded joint. After the threaded joint is screwed, the leakage hole is located inside the wall of the pressure-bearing equipment.

9. The safety lock for pressure-bearing equipment according to claim 2, characterized in that: The first rod-penetrating cavity, the second rod-penetrating cavity, the pressure-bearing cavity and the pressure-inducing hole are coaxially arranged.

10. A pressure-bearing device, characterized in that: Including the safety lock for pressure-bearing equipment as described in any one of claims 1 to 9.

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