Tri-axial ultra-high pressure pressure-maintaining loading device

Abstract

The application provides a triaxial ultrahigh pressure pressure maintaining loading device, which locks a lock rod in a cylinder body through a lock structure, ensures the stability and reliability of the axial position of the push rod, and further improves the precision and durability of the entire experimental system. In order to achieve the above-mentioned purpose, the triaxial ultrahigh pressure pressure maintaining loading device comprises a cylinder body, a push rod and a lock structure capable of deforming in a radial direction, the cylinder body is provided with a main cavity and a channel in communication, the push rod can move along the channel, and part of the channel is concave radially to form a groove portion for accommodating the lock structure; the lock structure comprises a plurality of lobe portions, the lobe portions are arranged around the push rod, each lobe portion has axially opposite leading and trailing ends; the trailing end is at least axially abutted with the groove wall, and the leading end can be radially outwardly turned to an unlocking position or radially inwardly turned to a locking position; the push rod comprises a stop portion, and the leading end is axially abutted with the stop portion in the locking position.

Description

Technical Field

[0001] This invention relates to the field of mechanical testing equipment technology, specifically to a triaxial ultra-high pressure holding and loading device. Background Technology

[0002] In the fields of materials science and structural mechanics research, triaxial high-pressure loading devices are widely used as important experimental equipment to simulate the mechanical behavior of materials under complex stress states. These devices achieve multiaxial loading tests on samples by precisely controlling stress in multiple directions to evaluate the strength, deformation characteristics, and failure mechanisms of materials under different stress conditions. One of the core design features of the triaxial high-pressure loading device is its ability to stably and reliably push the sample into the main test chamber via a pusher, ensuring a constant sample position throughout the entire testing cycle. This is crucial for obtaining accurate and reliable experimental data.

[0003] In traditional designs, to ensure stable axial positioning of the push rod and prevent it from retracting due to reverse thrust during high-pressure testing, a threaded connection is typically used between the push rod and the cylinder of the triaxial high-pressure loading device. This connection method effectively locks the push rod position within a certain pressure range, ensuring test stability. However, modern triaxial high-pressure loading experiments often require higher test pressures. During high-intensity, long-term high-pressure tests, the locking force of the threaded connection gradually weakens due to material creep, thread wear, and other factors, potentially leading to slight or even significant axial displacement of the push rod. This displacement not only affects the accuracy of the sample's position but may also introduce additional stress states, severely interfering with the reliability of the experimental results. Summary of the Invention

[0004] The purpose of this invention is to provide a triaxial ultra-high pressure holding and loading device. By setting a locking structure to lock the locking rod to the cylinder, the stability and reliability of the axial position of the push rod are ensured, thereby improving the accuracy and durability of the entire experimental system.

[0005] To achieve the above objectives, the present invention provides a triaxial ultra-high pressure holding and loading device, which includes a cylinder, a push rod, and a locking structure that can deform radially. The cylinder has a main cavity and a channel that are connected. The push rod can move along the channel. A portion of the channel is radially concave to form a groove for accommodating the locking structure.

[0006] The lock structure includes several petals arranged around the push rod, each petal having an axially opposite head end and tail end; the tail end abuts against the groove wall at least axially, and the head end can be radially outward to the unlock position or radially inward to the lock position. The push rod includes a stop portion, in which the head end abuts against the stop portion axially in the lock position.

[0007] By adopting the technical solution of this application, a locking structure is set in the channel to form an axial stop for the push rod, thereby ensuring the stability and reliability of the push rod's axial position and improving the accuracy and durability of the entire experimental system.

[0008] Optionally, a closed-loop head spring is included, the head spring being disposed on the outer side wall of the petal near the head end to apply an inward elastic force to the petal.

[0009] In this way, the first spring is driven to deform during the radial outward rotation in the unlocked position, and can automatically rotate inward after the external force disappears, thus realizing the self-locking of the lock structure.

[0010] Optionally, the tail end abuts radially against a portion of the groove wall. This allows the lock structure to be fixed within the groove while maintaining its radial position within the groove.

[0011] Optionally, a closed-loop tail spring is included, which is disposed on the inner side of the petal near the tail end to apply an outward elastic force to the petal. By providing a tail spring, a mechanical structure is used to radially press the tail end of the petal against the groove wall.

[0012] Optionally, the inner diameter of the tail end is greater than or equal to the radial dimension of the channel. Thus, in the unlocked state, the stop can move along the channel through the middle of the tail end for loading or unloading operations.

[0013] Optionally, the system also includes an unlocking tube that can be inserted into the channel, wherein the outer diameter of the unlocking tube is the same as the outer diameter of the stop portion. By providing the unlocking tube, the flap can be driven to flip outward during the insertion of the unlocking tube into the channel, thereby switching from the locked position to the unlocked position.

[0014] Optionally, the end of the unlocking tube is provided with a first inclined surface adapted to fit the inner wall of the flap, the radial dimension of the first inclined surface increasing from the side closer to the main cavity to the side farther away from the main cavity. By providing the first inclined surface, the resistance to the unlocking tube driving the flap to flip is reduced, and the unlocking tube can also be guided into the inner side of the lock structure.

[0015] Optionally, the end of the stop portion near the main cavity is provided with a second inclined surface adapted to fit the inner wall of the flap portion. By providing the second inclined surface, the resistance of the stop portion in driving the flap portion to flip is reduced, and the unlocking tube can also be guided into the inner side of the lock structure.

[0016] Optionally, it also includes a drive unit and an adapter pipe, the adapter pipe being directly or indirectly connected to the output end of the drive unit, and the adapter pipe being detachably connected to the push rod. This allows the push rod and the drive unit to be connected via the adapter pipe.

[0017] Optionally, at least a portion of the outer wall of the stop is sealingly adapted to the wall of the channel. This allows the main cavity to be sealed.

[0018] Other features and advantages of this specification will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0019] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of this specification and, together with their description, serve to explain the principles of this specification.

[0020] Figure 1 This is a schematic diagram of the structure of the triaxial ultra-high pressure holding and loading device in an embodiment of the present invention;

[0021] Figure 2 yes Figure 1 Partial structural diagram;

[0022] Figure 3 This is a structural diagram of part of the cylinder block, showing the passageway;

[0023] Figure 4 This is a schematic diagram of the lock structure;

[0024] Figure 5 yes Figure 4 Top view;

[0025] Figure 6 This is one of the processes by which the lock structure changes from the locked position to the unlocked position in the embodiments of the present invention;

[0026] Figure 7 This is the second process in the embodiment of the invention where the lock structure changes from the locked position to the unlocked position;

[0027] Figure 8 This is the third process in the embodiment of the invention where the lock structure changes from the locked position to the unlocked position;

[0028] Figure 9 This is a schematic diagram of the unlocking tube;

[0029] Figure 10 yes Figure 9 Top view;

[0030] Figure 11 This is a bottom view of the transfer pipe;

[0031] Figure 12 This is a schematic diagram of the push rod structure;

[0032] Figure 13 This is a side view of the retaining ring;

[0033] Figure 14 This is a top view of the retaining ring.

[0034] Figure label:

[0035] 100-Cylinder body; 101-Main cavity; 102-Channel; 102a-Insertion; 102b-Slot; 102b-1-Slot top wall; 102b-2-Slot bottom wall; 102b-3-Slot side wall; 200-Push rod; 201-Front rod section; 202-Stop section; 202a-Retaining ring; 203-Rear rod section; 200-1-Adapter pipe; 200-2-Unlocking pipe; 300-Lock structure; 301-Petal section; 301a-Inner side; 301b-Outer side; 301-1-Head end; 301-2-Tail end; 302-Head spring; 303-Tail spring; 304-Mounting slot; 900-Test piece. Detailed Implementation

[0036] This invention provides a triaxial ultra-high pressure holding and loading device. By setting a locking structure to lock the locking rod to the cylinder, the stability and reliability of the axial position of the push rod are ensured, thereby improving the accuracy and durability of the entire experimental system.

[0037] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0038] Relational terms such as “first” and “second” are used merely to distinguish one component from another that has the same name, without necessarily requiring or implying any such actual relationship or order between the components.

[0039] Please refer to Figures 1 to 14 As shown, Figure 1 This is a schematic diagram of the structure of the triaxial ultra-high pressure holding and loading device in an embodiment of the present invention; Figure 2 yes Figure 1 Partial structural diagram; Figure 3 This is a structural diagram of part of the cylinder block, showing the passageway; Figure 4 This is a schematic diagram of the lock structure; Figure 5 yes Figure 4 Top view; Figure 6 This is one of the processes by which the lock structure changes from the locked position to the unlocked position in the embodiments of the present invention; Figure 7 This is the second process in the embodiment of the invention where the lock structure changes from the locked position to the unlocked position; Figure 8 This is the third process in the embodiment of the invention where the lock structure changes from the locked position to the unlocked position; Figure 9 This is a schematic diagram of the unlocking tube; Figure 10 yes Figure 9 Top view; Figure 11 This is a bottom view of the transfer pipe; Figure 12This is a schematic diagram of the push rod structure; Figure 13 This is a side view of the retaining ring; Figure 14 This is a top view of the retaining ring.

[0040] To achieve the above objectives, the present invention provides a triaxial ultra-high pressure holding and loading device, which includes a cylinder 100, a push rod 200, and a locking structure 300 that can deform radially. The cylinder 100 has a main cavity 101 and a channel 102 that are connected to each other, and the push rod 200 can move along the channel 102.

[0041] The main cavity 101 serves as a test cavity to accommodate the test piece 900 and to perform pressure testing on it. The channel 102 extends along the height direction and can be located on the upper or lower side of the main cavity 101, but more often on the lower side. In this case, the top of the push rod 200 is used to support the test piece 900. During the feeding process, the push rod 200 can be inserted into the channel 102 from bottom to top and push the test piece 900 in and maintain it at the set height of the main cavity 101. Of course, if the channel 102 is located on the upper side of the main cavity 101, then the bottom end of the push rod 200 is equipped with the test piece 900. During the feeding process, the push rod 200 is inserted into the channel 102 from top to bottom and pushes the test piece 900 into and fixes it at the set height of the main cavity 101. Similarly, the channel 102 can also be extended in the left and right direction and located on the left or right side of the main cavity 101. These are all within the protection scope of this patent.

[0042] In this embodiment, in order to accommodate and fix the lock structure 300, a portion of the channel 102 is radially recessed to form a groove 102b for accommodating the lock structure 300. The groove 102b has an annular structure, surrounds the outside of the push rod 200, and is spaced from the outer side wall of the push rod 200. The space between the grooves is used to accommodate the lock structure 300 and allow the lock structure 300 to deform radially within the space between the grooves to switch between the unlocked and unlocked positions.

[0043] The groove 102b has a bottom wall 102b-2 and a top wall 102b-1 that are opposite each other along the height direction. The bottom wall 102b-2 and the top wall 102b-1 extend radially. A side wall 102b-3 is provided between the bottom wall 102b-2 and the top wall 102b-1. The side wall 102b-3 extends axially and is radially opposite to the groove opening. The groove opening penetrates the wall of the channel 102, thereby realizing the connection between the groove 102b and the channel 102.

[0044] The locking structure 300 includes a plurality of petals 301, which may be two, three or more; in an example shown in the figure, the number of petals 301 is eight. The plurality of petals 301 are elastically connected circumferentially and arranged around the push rod 200.

[0045] The locking structure 300 includes a closed-loop spring assembly. Under the action of the spring assembly, the individual petals 301 are closely distributed circumferentially. The spring assembly includes at least one spring, thereby generating a spring force on each petal 301 along its circumferential direction. Each petal 301 has an axially opposite head end 301-1 and a tail end 301-2. The end faces of both the head end 301-1 and the tail end 301-2 extend horizontally. The petal 301 has an inclined structure, with its inner surface 301a forming a 75° slope and its outer surface 301b forming a 74° slope. Other inclination angles are also possible and are not specifically limited here. In a specific example, the petals 301 form a trapezoidal frustum structure, the middle of which is hollow, and the cross-sectional shape of its middle part along the axial direction is trapezoidal. Both the inner surface 301a and the outer surface 301b of the petal 301 are curved surfaces. Of course, the inner surface 301a and the outer surface 301b of the petal 301 can also be straight surfaces, or the inner surface 301a can be straight surfaces and the outer surface 301b can be curved surfaces, or the outer surface 301b can be straight surfaces and the inner surface 301a can be curved surfaces.

[0046] The locking structure 300 is located within the groove 102b. The tail end 301-2 abuts against the groove wall at least axially, meaning the outer surface 301b of the tail end 301-2 presses against the bottom wall 102b-2 of the groove. The head end 301-1 can be radially flipped outwards to the unlocked position or radially flipped inwards to the locked position. The push rod 200 includes a stop portion 202. The push rod 200 includes a rod body and a stop portion 202 formed by the radial outer edge of the rod body. The stop portion 202 matches the radial dimension of the channel 102, while the radial dimension of the rod body is smaller than the radial dimension of the channel 102. The rod body itself can be a constant diameter structure or its radial dimension can vary in a stepped manner; here, it is sufficient that the radial dimension of the stop portion 202 is the maximum value of the radial dimension of the push rod 200. Furthermore, the stop portion 202 is located in the middle of the rod body. Here, "middle" does not specifically refer to the axial midpoint of the rod body, but rather to any area between the top and bottom ends of the rod body.

[0047] The locking end 301-1 abuts axially against the stop part 202. The specific rotation method of the flap 301 will be explained in detail below.

[0048] By adopting the technical solution of this application, a locking structure 300 is set in the channel 102 to form an axial stop on the push rod 200, thereby ensuring the stability and reliability of the axial position of the push rod 200 and improving the accuracy and durability of the entire experimental system.

[0049] In an optional example, the tail end 301-2 abuts radially against a portion of the groove wall of the groove 102b. This secures the locking structure 300 within the groove 102b while maintaining its radial position within the groove 102b. Specifically, at least one spring in the spring assembly can be used to achieve this radial abutment. Specifically, the spring assembly includes a tail spring 303, which is disposed on the inner surface 301a of the tail end 301-2 to apply an outward elastic force to the flap 301. The tail spring 303 is disposed on the inner surface 301a of the flap 301 near the tail end 301-2, and by providing the tail spring 303, the tail end 301-2 of the flap 301 is radially pressed against the groove wall using a mechanical structure. Of course, the switching between the unlocked and locked positions can also be achieved if the tail end 301-2 does not abut against the groove side wall 102b-3 of the groove 102b. For example, a magnetic suction element can be set in a groove to generate radial magnetic force on the petal 301, or a positioning groove can be opened in the bottom wall 102b-2 of the groove so that the tail end 301-2 of the petal 301 can be inserted into the positioning groove. In addition, besides using the tail spring 303 to drive the petal 301 to radially press against the groove side wall 102b-3, an electromagnetic drive element can also be used.

[0050] The spring assembly also includes a closed-loop first spring 302, which is disposed on the outer wall of the petal portion 301 near the first end 301-1 to apply an inward elastic force to the petal portion 301. In this way, the tail spring 303 is subjected to an outward elastic force by the inner side surface 301a of the petal portion 301, and the bottom of the petal portion 301 always remains in an outwardly expanded state and abuts against the groove side wall 102b-3. At this time, the tail spring 303 is still in a deformed state. The first spring 302, located on the outer side surface 301b of the petal portion 301, applies an inward elastic force to drive the first end 301-1 near the push rod 200 so that the axial projection plane of the first end 301-1 can partially coincide with the projection range of the stop portion 202, thereby abutting against the stop portion 202 in the axial direction. In this way, the first spring 302 is driven to deform during the radial outward rotation in the unlocked position. After the external force disappears, it can automatically rotate inward, thus realizing the self-locking of the lock structure 300.

[0051] To secure the head spring 302 and tail spring 303, a C-shaped annular mounting groove 304 is provided on the inner side 301a and outer side wall of the petal portion 301. The opening of the mounting groove 304 is used to stop the head spring 302 and tail spring 303 within the mounting groove 304 to prevent them from popping out. During the flipping process of the petal portion 301, both the head spring 302 and tail spring 303 can rotate relative to the mounting groove 304, thereby preventing the mounting groove 304 from interfering with the deformation of the head spring 302 and tail spring 303.

[0052] In the example shown, the channel 102 penetrates the bottom surface of the cylinder 100 to form an insertion port 102a. The bottom of the locking structure 300, i.e., the tail end 301-2 of each petal 301, faces the side where the opening is located, while the head end 301-1 faces the side where the main cavity 101 is located. The inner diameter of the bottom of the locking structure 300 is larger than the inner diameter of the head end 301-1 of the locking structure 300, and is also larger than the inner diameter of the stop part 202.

[0053] The following is a detailed description of the feeding process of the triaxial ultra-high pressure holding and loading device in this application, as well as the adaptation method between the push rod 200 and the lock structure 300 during the testing process.

[0054] Feeding process

[0055] During the loading process, the test piece 900 is first installed on the top of the rod body. Then, the radial dimension of the test piece 900 is smaller than the inner diameter of the stop part 202 and smaller than the inner diameter of the first end 301-1 of the lock structure 300. In the axial direction, the portion of the rod body located near the main cavity 101 of the stop portion 202 (as shown in the example, the portion of the rod body located on the upper side of the stop portion 202 is defined as the front rod segment 201; conversely, the portion of the rod body located away from the main cavity 101 of the stop portion 202, i.e., the portion of the rod body located on the lower side of the stop portion 202, is defined as the rear rod segment 203) has a radial dimension smaller than that of the stop portion 202. This ensures that during the insertion of the lock structure 300, the stop portion 202 first contacts the inner surface 301a of the flap portion 301, meaning that neither the test piece 900 nor the front rod segment 201 will contact the inner surface 301a of the flap portion 301. The inner diameter of the tail end 301-2 is greater than or equal to the radial dimension of the channel 102. Thus, in the unlocked state, the stop portion 202 can move along the channel 102 through the middle of the tail end 301-2 for loading operations.

[0056] Specifically, the stop 202 first enters the tail of the lock structure 300. The side edge of the top of the stop 202 abuts against the inner side surface 301a of the tail of the lock structure 300. As the stop 202 is further inserted, the flap 301 is driven by the stop 202 to flip outward to the unlocked position. In the unlocked position, the inner diameter of the tip 301-1 of the flap 301 is large enough to allow the stop 202 to pass through.

[0057] After the stop portion 202 passes through the first end 301-1 of the plate portion, under the drive of the first elastic member, the petal portion 301 flips inward to reset, or flips inward to abut radially against the side wall of the portion of the push rod 200 located away from the central cavity of the stop portion 202, that is, against the rear rod section 203 of the push rod 200. At the same time, under the action of gravity, the push rod 200 presses down to the end face of the first end 301-1 of each petal portion 301 to form a lock, completing the loading operation.

[0058] As one implementation method, the insertion process of the push rod 200 can be performed manually or electrically. In the electrically inserted method, a drive component and an adapter pipe 200-1 are included to move the push rod 200. The drive component can be a motor, hydraulic press, etc. The adapter pipe 200-1 is fitted onto the rear rod section 203 and is detachably connected to the rear rod section 203, specifically through a threaded connection. The radial dimension of the adapter pipe 200-1 is smaller than the radial dimension of the channel 102 so that the adapter pipe 200-1 can also be inserted into the channel 102. The adapter pipe 200-1 is directly or indirectly connected to the output end of the drive component, thereby connecting the push rod 200 and the drive component through the adapter pipe 200-1. Optionally, the edge of the adapter pipe 200-1 near the top of the stop portion 202 has a 45° chamfer.

[0059] After the material loading operation is completed, the test piece 900 can be tested. During this process, the locking structure 300 always keeps the push rod 200 locked.

[0060] In the aforementioned embodiment, the end of the stop portion 202 near the main cavity 101 is provided with a second inclined surface to adapt to the inner wall of the flap portion 301. By providing the second inclined surface, the resistance of the stop portion 202 in driving the flap portion 301 to flip is reduced, and the unlocking tube 200-2 can also be introduced into the inner side of the lock structure 300.

[0061] The unlocking method and material cutting operation of lock structure 300 are explained in detail below.

[0062] In order to unlock the lock structure 300 for unloading after testing, either mechanical unlocking or electronic unlocking can be used. In electronic unlocking, an electromagnetic drive can be used to drive the petal 301 to flip outward again to the unlock position. Those skilled in the art can also choose other electric unlocking methods as needed.

[0063] The mechanical unlocking method is described here with a specific embodiment. It also includes an unlocking tube 200-2 that can be inserted into the channel 102. The unlocking tube 200-2 can be sleeved on the outside of the push rod 200, and the outer diameter of the unlocking tube 200-2 matches the outer diameter of the stop portion 202. By providing the unlocking tube 200-2, the flap 301 can be driven to flip outward during the insertion of the unlocking tube 200-2 into the channel 102, thereby switching from the locked position to the unlocked position.

[0064] Specifically, the inner diameter of the unlocking tube 200-2 is larger than that of the rear rod section 203 and smaller than that of the channel 102. During the loading and testing process, the rear rod section 203 and the channel 102 are radially spaced apart, and the unlocking tube 200-2 can be inserted into this gap. The outer diameter of the unlocking tube 200-2 is consistent with the outer diameter of the stop section 202.

[0065] Optionally, the end of the unlocking tube 200-2 is provided with a first inclined surface adapted to fit the inner wall of the flap 301. The radial dimension of the first inclined surface increases from the side closer to the main cavity 101 to the side farther away from the main cavity 101. By providing the first inclined surface, the resistance of the unlocking tube 200-2 in driving the flap 301 to flip is reduced, and the unlocking tube 200-2 can also be guided into the inner side of the lock structure 300. As an option, the first inclined surface is 75°, but other inclination angles are also possible, which can be selected by those skilled in the art.

[0066] The unlocking and unloading methods of lock structure 300 will be further explained below.

[0067] Material feeding process

[0068] Separate the adapter tube 200-1 from the rear rod section 203 and unload it from the channel 102. Then, put the unlocking tube 200-2 on the outside of the rear rod section 203 and insert it into the gap between the rear rod section 203 and the channel 102. Continue to push it upward until it abuts against the inner side 301a of the tail end 301-2 of the petal 301. As the unlocking tube 200-2 is further inserted axially, the petal 301 is driven to turn outward until the tube end face of the unlocking tube 200-2 abuts axially against the end face of the stop part 202. At this time, pull out the push rod 200 along the direction of the push-out channel 102. The stop part 202 and the unlocking tube 200-2 can then be withdrawn from the locking structure 300 together, completing the unloading operation.

[0069] In the above embodiments, at least a portion of the outer side wall of the stop 202 is sealed to the wall of the channel. This seals the main cavity 101. Specifically, the stop 202 and the retaining ring 202a combine to form an annular receiving groove for accommodating the rubber sealing ring. The outer side wall of the retaining ring 202a is radially the same as that of the stop 202, and the outer side wall of the retaining ring 202a is inclined at 75°.

[0070] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A triaxial ultra-high pressure holding and loading device, characterized in that, The device includes a cylinder (100), a push rod (200), and a locking structure (300) that can deform radially. The cylinder (100) has a main cavity (101) and a channel (102) that are connected. The main cavity (101) serves as a test cavity to accommodate the test piece (900). The push rod (200) can move along the channel (102). A portion of the channel (102) is radially concave to form a groove (102b) for accommodating the locking structure (300). The locking structure (300) includes several petals (301) and a closed-loop spring assembly. Under the action of the spring assembly, each petal (301) is closely distributed circumferentially. The petals (301) are arranged around the push rod (200). Each petal (301) has an axially opposite head end (301-1) and a tail end (301-2). The head end (301-1) faces the side where the main cavity (101) is located; the tail end (301-2) faces the side where the main cavity (101) is located. 01-2) The first end (301-1) is at least axially abutting against the groove wall of the groove (102b), and can be radially outward to the unlock position or radially inward to the lock position. The push rod (200) includes a rod body and a stop (202) formed by the radial outer edge of the rod body. The stop (202) matches the radial dimension of the channel (102), while the radial dimension of the rod body is smaller than the radial dimension of the channel (102). In the locked position, the head end (301-1) abuts axially against the stop portion (202), and the petal portion (301) has an inclined structure; The spring assembly includes a closed-loop head spring (302) disposed on the outer side wall of the petal (301) near the head end (301-1) to apply an inward elastic force to the petal (301).

2. The triaxial ultra-high pressure holding and loading device according to claim 1, characterized in that, The tail end (301-2) abuts radially against a portion of the groove wall of the groove (102b).

3. The triaxial ultra-high pressure holding and loading device according to claim 2, characterized in that, The spring assembly also includes a closed-loop tail spring (303) disposed on the inner side (301a) of the petal (301) near the tail end (301-2) to apply an outward elastic force to the petal (301).

4. The triaxial ultra-high pressure holding and loading device according to claim 1, characterized in that, The inner diameter of the tail end (301-2) is greater than or equal to the radial dimension of the channel (102).

5. The triaxial ultra-high pressure holding and loading device according to any one of claims 1-4, characterized in that, The triaxial ultra-high pressure holding and loading device also includes an unlocking tube (200-2) that can be inserted into the channel (102). The unlocking tube (200-2) is sleeved on the outside of the push rod (200), and the outer diameter of the unlocking tube (200-2) is consistent with the outer diameter of the stop part (202).

6. The triaxial ultra-high pressure holding and loading device according to claim 5, characterized in that, The end of the unlocking tube (200-2) is provided with a first inclined surface for adapting to the inner wall of the flap (301), the radial dimension of the first inclined surface increasing from the side closer to the main cavity (101) toward the side farther away from the main cavity (101).

7. The triaxial ultra-high pressure holding and loading device according to any one of claims 1-6, characterized in that, The end of the stop portion (202) near the main cavity (101) is provided with a second inclined surface for adapting to the inner wall of the petal portion (301).

8. The triaxial ultra-high pressure holding and loading device according to any one of claims 1-4, characterized in that, It also includes a drive unit and an adapter pipe (200-1), the adapter pipe (200-1) being directly or indirectly connected to the output end of the drive unit, and the adapter pipe (200-1) being detachably connected to the push rod (200).

9. The triaxial ultra-high pressure holding and loading device according to any one of claims 1-4, characterized in that, In the radial direction, the stop (202) is sealed to the wall of the channel (102).

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