Triaxial ultrahigh pressure maintaining loading device

Abstract

According to the triaxial ultrahigh pressure maintaining loading device provided by the invention, the lock rod is locked in the cylinder body by arranging the lock structure, so that the stability and the reliability of the axial position of the push rod are ensured, and the precision and the durability of a whole experiment system are further improved. In order to achieve the purpose, the triaxial ultrahigh pressure maintaining loading device comprises a cylinder body, a push rod and a lock structure capable of deforming in the radial direction, the cylinder body is provided with a main cavity and a channel which are communicated with each other, the push rod can move along the channel, and part of the channel is concaved outwards in the radial direction to form a groove part used for containing the lock structure; the lock structure comprises a plurality of valve parts, the valve parts are arranged around the push rod, and each valve part is provided with a head end and a tail end which are axially opposite to each other; the tail end abuts against the groove wall at least in the axial direction, the head end can be overturned outwards in the radial direction to an unlocking position or overturned inwards in the radial direction to a locking position, the push rod comprises a stop part, and the head end abuts against the stop part in the axial direction in the locking position.

Description

Technical Field

[0001] The present invention relates to the technical field of mechanical testing equipment, and specifically, to a triaxial ultra-high pressure pressure-holding loading device. Background Art

[0002] In the fields of materials science and structural mechanics research, triaxial high-pressure loading devices, as important experimental equipment, are widely used to simulate the mechanical behavior of materials under complex stress states. Such devices achieve multi-axial loading tests on samples by precisely controlling stresses in multiple directions to evaluate the strength, deformation characteristics, and failure mechanisms of materials under different stress conditions. One of the core designs of triaxial high-pressure loading devices lies in their ability to stably and reliably push a sample to be tested into the main test chamber through a push rod and ensure the constancy of the sample position throughout the test cycle, which is crucial for obtaining accurate and reliable experimental data.

[0003] In traditional designs, in order to achieve stable axial positioning of the push rod and prevent it from retracting due to reverse thrust during high-pressure tests, a threaded connection between the push rod and the cylinder body of the triaxial high-pressure loading device is usually adopted. This connection method can effectively lock the position of the push rod within a certain pressure range and ensure the stability of the test. However, modern triaxial high-pressure loading experiments often require higher test pressures. In high-intensity and long-duration high-pressure tests, due to factors such as material creep and thread wear, the locking force of the threaded connection gradually weakens, resulting in possible small or even significant axial displacement of the push rod. Such displacement not only affects the accuracy of the position of the sample to be tested but also may introduce additional stress states, thus seriously interfering with the reliability of the experimental results. Summary of the Invention

[0004] The object of the present invention is to provide a triaxial ultra-high pressure pressure-holding loading device, which locks a locking rod to a cylinder body through a locking structure to ensure the stability and reliability of the axial position of the push rod, thereby improving the accuracy and durability of the entire experimental system.

[0005] To achieve the above object, the present invention provides a triaxial ultra-high pressure pressure-holding loading device, which includes a cylinder body, a push rod, and a locking structure capable of deforming radially. The cylinder body is provided with a main chamber and a channel that communicate with each other. The push rod can move along the channel, and a part of the channel is radially concave to form a groove portion for accommodating the locking structure.

[0006] The locking structure includes a plurality of flap portions that are arranged around the push rod. Each flap portion has a head end and a tail end that are axially opposite to each other. The tail end abuts against the groove wall at least axially. The head end can be radially flipped outward to an unlocking position or radially flipped inward to a locking position. The push rod includes a stop portion, and at the locking position, the head end abuts against the stop portion axially.

[0007] By adopting the technical solution of the present application, a locking structure is arranged in the channel to axially stop the push rod, ensuring the stability and reliability of the axial position of the push rod, and thus improving the accuracy and durability of the entire experimental system.

[0008] Optionally, it includes a first spring in a closed-loop shape, and the first spring is arranged on the outer side wall of the flap portion near the first end to apply an inward elastic force to the flap portion.

[0009] In this way, the first spring is driven to deform during the process of radially flipping outward in the unlocked position, and after the external force disappears, it can automatically flip inward. Thus, the self-locking of the locking structure is realized.

[0010] Optionally, the tail end abuts against a part of the groove wall of the groove portion in the radial direction. This can fix the locking structure in the groove portion while ensuring the radial position of the locking structure in the groove portion.

[0011] Optionally, it includes a tail spring in a closed-loop shape, and the tail spring is arranged on the inner side surface of the flap portion near the tail end to apply an outward elastic force to the flap portion. By arranging the tail spring, the tail end of the flap portion is radially pressed against the groove wall in a mechanical structure manner.

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

[0013] Optionally, it further includes an unlocking tube that can be inserted into the channel, and the outer diameter dimension of the unlocking tube is consistent with the outer diameter dimension of the stop portion. By arranging the unlocking tube, the flap portion can be driven to flip outward during the process of inserting 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 the inner wall of the flap portion, and the radial dimension of the first inclined surface increases from the side close to the main cavity to the side away from the main cavity. By arranging the first inclined surface, the resistance of the unlocking tube to drive the flap portion to flip is reduced, and at the same time, the unlocking tube can be guided to the inner side of the locking structure.

[0015] Optionally, the end of the stop portion near the main cavity is provided with a second inclined surface adapted to the inner wall of the flap portion. By arranging the second inclined surface, the resistance of the stop portion to drive the flap portion to flip is reduced, and at the same time, the unlocking tube can be guided to the inner side of the locking structure.

[0016] Optionally, it further includes a driving member and a connecting pipe. The connecting pipe is directly or indirectly connected to the output end of the driving member, and the connecting pipe is detachably connected to the push rod. Thus, the push rod and the driving member can be connected through the connecting pipe.

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

[0018] Other features and advantages of the present specification will become clear from the following detailed description of the exemplary embodiments of the present specification with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings incorporated in and constituting a part of this specification illustrate embodiments of the present specification and, together with the description thereof, are used to explain the principles of the present specification.

[0020] Figure 1 is a schematic structural diagram of a three-axis ultra-high pressure pressure-maintaining loading device in an embodiment of the present invention;

[0021] Figure 2 is Figure 1 a partial structural diagram of

[0022] Figure 3 is a schematic structural diagram of a partial cylinder block, showing the channel;

[0023] Figure 4 is a schematic structural diagram of a locking structure;

[0024] Figure 5 is Figure 4 a top view of

[0025] Figure 6 is one of the processes of the locking structure changing from the locked position to the unlocked position in an embodiment of the present invention;

[0026] Figure 7 is another process of the locking structure changing from the locked position to the unlocked position in an embodiment of the present invention;

[0027] Figure 8 is the third process of the locking structure changing from the locked position to the unlocked position in an embodiment of the present invention;

[0028] Figure 9 is a schematic structural diagram of an unlocking tube;

[0029] Figure 10 is Figure 9 a top view of

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

[0031] Figure 12 is a schematic structural diagram of a push rod;

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

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

[0034] Reference signs:

[0035] 100 - cylinder block; 101 - main cavity; 102 - channel; 102a - socket; 102b - groove portion; 102b-1 - groove top wall; 102b-2 - groove bottom wall; 102b-3 - groove side wall; 200 - push rod; 201 - front rod section; 202 - stop portion; 202a - retaining ring; 203 - rear rod section; 200-1 - adapter tube; 200-2 - unlocking tube; 300 - locking structure; 301 - flap portion; 301a - inner side surface; 301b - outer side surface; 301-1 - head end; 301-2 - tail end; 302 - head spring; 303 - tail spring; 304 - mounting groove; 900 - specimen to be tested. Detailed implementation manners

[0036] The present invention provides a three-axis ultra-high pressure holding and loading device. By setting a locking structure to lock the locking rod to the cylinder block, 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] In order to enable those skilled in the art to better understand the solution of the present invention, the present invention will be further described in detail below with reference to the drawings and specific implementation manners.

[0038] Relative terms such as "first" and "second" are only used to distinguish one component with the same name from another, and do not necessarily require or imply any such actual relationship or order between these components.

[0039] Please refer to Figures 1 to 14 as shown Figure 1 It is a schematic structural diagram of the three-axis ultra-high pressure holding and loading device in the embodiment of the present invention; Figure 2 is Figure 1 a partial structural diagram of Figure 3 It is a schematic structural diagram of a partial cylinder block, showing the channel; Figure 4 It is a schematic structural diagram of the locking structure; Figure 5 is Figure 4 a top view of Figure 6 It is one of the processes in which the locking structure of the present invention changes from the locked position to the unlocked position; Figure 7 It is another process in which the locking structure of the present invention changes from the locked position to the unlocked position; Figure 8 It is the third process in which the locking structure of the present invention changes from the locked position to the unlocked position; Figure 9 It is a schematic structural diagram of the unlocking tube; Figure 10 is Figure 9 a top view of Figure 11 It is a bottom view of the adapter tube; Figure 12It is a schematic structural diagram of a push rod; Figure 13 It is a side view of a retaining ring; Figure 14 It is a top view of a retaining ring.

[0040] To achieve the above object, the present invention provides a triaxial ultra-high pressure pressure-holding loading device. The triaxial ultra-high pressure pressure-holding loading device includes a cylinder block 100, a push rod 200, and a locking structure 300 capable of deforming radially. The cylinder block 100 is provided with a main cavity 101 and a channel 102 that communicate with each other. The push rod 200 can move along the channel 102.

[0041] Among them, the main cavity 101 serves as a test cavity for accommodating a test piece 900 and performing a pressurization test operation on the test piece 900. The channel 102 extends in the height direction and can be provided on the upper side or the lower side of the main cavity 101. More often, it is provided on the lower side of the main cavity 101. At this time, the top end 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 into and hold it at the set height of the main cavity 101. Of course, if the channel 102 is provided on the upper side of the main cavity 101, then the bottom end of the push rod 200 is hoisted 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. Of course, by analogy, the channel 102 can also extend in the left-right direction and be provided on the left side or the right side of the main cavity 101. These all belong to the protection scope of this patent.

[0042] In this embodiment, in order to accommodate and fix the locking structure 300, a part of the radial direction of the channel 102 is recessed outward to form a groove portion 102b for accommodating the locking structure 300. The groove portion 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 spaced space is used to accommodate the locking structure 300 and allow the locking structure 300 to perform radial deformation in this spaced space to switch between the locked position and the unlocked position.

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

[0044] The locking structure 300 includes a plurality of flap portions 301. The number of flap portions 301 can be two, three, or more. In an example shown in the figure, the number of flap portions 301 is eight. The plurality of flap portions 301 are elastically connected in the circumferential direction and surround the push rod 200.

[0045] The lock structure 300 includes a spring assembly in a closed-loop shape. Under the action of the spring assembly, each lobe 301 is tightly distributed circumferentially. The spring assembly includes at least one spring, thereby generating an elastic force on each lobe 301 along its circumferential direction. Each lobe 301 has a head end 301-1 and a tail end 301-2 that are axially opposite. The end faces of the head end 301-1 and the tail end 301-2 both extend in the horizontal direction. The lobe 301 has an inclined structure, its inner side surface 301a is a 75° inclined plane, and its outer side surface 301b is a 74° inclined plane. Other inclined angles are also possible and are not specifically limited here. In a specific example, the lobes 301 enclose a trapezoidal frustum structure, the middle of the frustum structure is empty, and the cross-sectional shape along the axial direction in the middle is trapezoidal. The inner side surface 301a and the outer side surface 301b of the lobe 301 are both arc surfaces. Of course, the inner side surface 301a and the outer side surface 301b of the lobe 301 can also be straight surfaces, or the inner side surface 301a is a straight surface and the outer side surface 301b is an arc surface, or the outer side surface 301b is a straight surface and the inner side surface 301a is an arc surface.

[0046] The lock structure 300 is within the groove portion 102b. The tail end 301-2 abuts against the groove wall at least axially, that is, the outer side 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 outward to the unlocked position or radially flipped inward 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 radially outer edge of the rod body. The stop portion 202 matches the radial dimension of the channel 102, and 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 the radial dimension of the rod body changes in a stepped manner. Here, as long as it is ensured that the radial dimension of the stop portion 202 is the maximum value of the radial dimension of the push rod 200. And the stop portion 202 is located in the middle of the rod body. The middle here does not specifically refer to the midpoint position of the axial direction of the rod body, but refers to any area between the top end and the bottom end of the rod body.

[0047] At the locked position, the head end 301-1 abuts against the stop portion 202 axially. The specific rotation mode of the lobe 301 will be described in detail in the following content.

[0048] By adopting the technical solution of the present application, the lock structure 300 is arranged in the channel 102 to axially stop the push rod 200, ensuring the stability and reliability of the axial position of the push rod 200, and further improving the accuracy and durability of the entire experimental system.

[0049] In an alternative example, the tail end 301-2 abuts against a partial groove wall of the groove portion 102b in the radial direction. Thereby, while the locking structure 300 can be fixed within the groove portion 102b, the radial position of the locking structure 300 within the groove portion 102b is ensured. Specifically, at least one spring in the spring assembly can be used to achieve the radial abutment. Specifically, the spring assembly includes a tail spring 303, and the tail spring 303 is disposed on the inner side surface 301a of the tail end 301-2 to apply an outward elastic force to the flap portion 301. The tail spring 303 is disposed on the inner side surface 301a of the flap portion 301 close to the tail end 301-2. By providing the tail spring 303, the tail end 301-2 of the flap portion 301 is radially pressed against the groove wall in a mechanical structure manner. Of course, if the tail end 301-2 does not abut against the groove side wall 102b-3 of the groove portion 102b, the switching between the unlocking position and the locking position can also be achieved. For example, a magnetic component can be arranged in a groove to generate a radial magnetic force on the flap portion 301, or a positioning groove can be opened on the bottom wall 102b-2 of the groove, and the tail end 301-2 of the flap portion 301 can be inserted into the positioning groove, etc.; in addition, in addition to using the tail spring 303 to drive the flap portion 301 to radially press against the groove side wall 102b-3, an electromagnetic driving component or other means can also be used to achieve this.

[0050] The spring assembly further includes a head spring 302 in a closed-loop shape. The head spring 302 is disposed on the outer side wall of the flap portion 301 close to the head end 301-1 to apply an inward elastic force to the flap portion 301. In this way, the tail spring 303 applies an outward elastic force from the inner side surface 301a of the flap portion 301, and the bottom of the flap portion 301 always maintains an outward-expanded state and abuts against the groove side wall 102b-3. At this time, the tail spring 303 is still in a deformed state. And the head spring 302 is located on the outer side surface 301b of the flap portion 301 to apply an inward elastic force to drive the head end 301-1 close to the push rod 200 until the projection surface of the head end 301-1 in the axial direction can partially coincide with the projection range of the stop portion 202, so as to be able to abut against the stop portion 202 in the axial direction. In this way, the head spring 302 is driven to deform during the radial outward flipping process in the unlocking position, and after the external force disappears, it can automatically flip inward. Thus, the self-locking of the locking structure 300 is achieved.

[0051] To fix the head spring 302 and the tail spring 303, C-shaped annular installation grooves 304 are opened on the inner side surface 301a and the outer side wall of the flap portion 301. The openings of the installation grooves 304 are used to stop the head spring 302 and the tail spring 303 within the installation grooves 304 to prevent them from popping out. During the flipping process of the flap portion 301, both the head spring 302 and the tail spring 303 can rotate relative to the installation grooves 304, thereby avoiding the interference of the installation grooves 304 with the deformation of the head spring 302 and the tail spring 303.

[0052] In the example shown in the figure, the channel 102 penetrates through the bottom end face of the cylinder block 100 to form a socket 102a. The bottom of the lock structure 300, that is, the tail ends 301-2 of the lobes 301, faces the side where the opening is located, while the head ends 301-1 face the side where the main cavity 101 is located. The inner diameter of the bottom of the lock structure 300 is larger than the inner diameter of the head end 301-1 of the lock structure 300 and larger than the inner diameter of the stop portion 202.

[0053] Next, the fitting manner of the push rod 200 and the lock structure 300 during the loading process and the testing process of the three-axis ultra-high pressure pressure-holding loading device in the present application will be specifically described.

[0054] Loading process

[0055] During the loading process, first, the test piece 900 to be tested is installed at the top end of the rod body. Then, the radial dimension of the test piece 900 to be tested is smaller than the inner diameter dimension of the stop portion 202 and smaller than the inner diameter dimension of the head end 301-1 of the lock structure 300. Axially, the rod body is located in the part of the stop portion 202 close to the main cavity 101 (in the example shown in the figure, the part of the rod body above the stop portion 202 is defined as the front rod section 201; conversely, the part of the rod body of the stop portion 202 far from the main cavity 101, that is, the part of the rod body below the stop portion 202, is defined as the rear rod section 203;), and its radial dimension is smaller than the radial dimension of the stop portion 202, so as to ensure that during the insertion into the lock structure 300, the stop portion 202 first contacts the inner side surface 301a of the lobe 301, that is, neither the test piece 900 nor the front rod section 201 will contact the inner side surface 301a of the lobe 301. The inner diameter dimension of the tail end 301-2 is larger than or equal to the radial dimension of the channel 102. Thus, in the unlocked state, the stop portion 202 can move along the middle of the tail end 301-2 into the channel 102 for the loading operation.

[0056] Specifically, the stop portion 202 first enters the tail of the lock structure 300. The side edge of the top end of the stop portion 202 abuts against the inner side surface 301a of the tail of the lock structure 300. As the stop portion 202 is further inserted, the lobe 301 is driven by the stop portion 202 to turn outwards to the unlocked position. In the unlocked position, the inner diameter dimension of the head end 301-1 of the lobe 301 allows the stop portion 202 to pass through.

[0057] After the stop portion 202 passes through the head end 301-1 of the plate portion, under the drive of the first elastic member, the lobe 301 turns inwards to reset, or turns inwards until it radially abuts against the side wall of the part of the push rod 200 on the side far from the middle cavity of the stop portion 202, that is, abuts against the rear rod section 203 of the push rod 200. At the same time, under the action of gravity, the push rod 200 is pressed down to the end face of the head end 301-1 of each lobe 301 to form a lock, completing the loading operation.

[0058] As an implementation manner, the insertion process of the push rod 200 can be manually operated or electrically inserted. In the case of electric insertion, a driving member and a transition pipe 200-1 are further included to drive the push rod 200 to move. The driving member can be a motor, a hydraulic press, etc. The transition pipe 200-1 is sleeved on the rear rod section 203 and is detachably connected to the rear rod section 203, specifically, it can be a threaded connection. The radial dimension of the transition pipe 200-1 is smaller than the radial dimension of the channel 102 so that the transition pipe 200-1 can also be inserted into the channel 102. The transition pipe 200-1 is directly or indirectly connected to the output end of the driving member, whereby the push rod 200 and the driving member can be connected through the transition pipe 200-1. Optionally, a 45° chamfer is provided at the edge of the top end of the transition pipe 200-1 near the stop portion 202.

[0059] After the feeding operation is completed, the test piece 900 to be tested can be tested. During this process, the locking structure 300 always maintains the locked state of the push rod 200.

[0060] In the foregoing embodiment, a second inclined surface adapted to the inner wall of the flap portion 301 is provided at the end of the stop portion 202 near the main cavity 101. By providing the second inclined surface, the resistance for the stop portion 202 to drive the flap portion 301 to flip is reduced, and at the same time, the unlocking pipe 200-2 can be introduced into the inside of the locking structure 300.

[0061] The unlocking method of the locking structure 300 and the method of the discharging operation will be specifically described below.

[0062] To unlock the locking structure 300 for discharging operation after the test, a mechanical unlocking method or an electric control unlocking method can be adopted. In the electric control unlocking method, an electromagnetic driving member can be used to drive the flap portion 301 to turn outwards again to the unlocking position. Those skilled in the art can also select other electric unlocking methods according to needs.

[0063] Here, a specific embodiment is used to illustrate the mechanical unlocking method. An unlocking pipe 200-2 that can be inserted into the channel 102 is further included. The unlocking pipe 200-2 can be sleeved on the outside of the push rod 200. The outer diameter dimension of the unlocking pipe 200-2 is the same as the outer diameter dimension of the stop portion 202. By providing the unlocking pipe 200-2, the flap portion 301 can be driven to turn outwards during the process of inserting the unlocking pipe 200-2 into the channel 102, so as to switch from the locked position to the unlocking 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 feeding and testing processes, the rear rod section 203 and the channel 102 are radially spaced apart, and the unlocking tube 200-2 can be inserted into this space, and the outer diameter of the unlocking tube 200-2 is consistent with the outer diameter of the stop portion 202.

[0065] Optionally, the end of the unlocking tube 200-2 is provided with a first inclined surface adapted to the inner wall of the flap portion 301, and the radial dimension of the first inclined surface increases from the side close to the main cavity 101 to the side away from the main cavity 101. By providing the first inclined surface, the resistance of the unlocking tube 200-2 to drive the flap portion 301 to flip is reduced, and at the same time, the unlocking tube 200-2 can be guided to the inside of the locking structure 300. As an alternative, the first inclined surface is 75°, and of course, it can also be other inclined angles, which can be selected by those skilled in the art.

[0066] The unlocking and discharging methods of the locking structure 300 will be further described below.

[0067] Discharging process

[0068] Separate the adapter tube 200-1 from the rear rod section 203 and unload it from the channel 102, then sleeved the unlocking tube 200-2 outside the rear rod section 203 and insert it into the space between the rear rod section 203 and the channel 102, and continuously push it up until it abuts against the inner surface 301a of the tail end 301-2 of the flap portion 301. As the unlocking tube 200-2 is further axially inserted, the flap portion 301 is driven to turn outwards until the tube end face of the unlocking tube 200-2 axially abuts against the end face of the stop portion 202. At this time, pull out the push rod 200 along the direction of the pushing channel 102, and the stop portion 202 and the unlocking tube 200-2 can be withdrawn from the locking structure 300 together to complete the discharging operation.

[0069] In the above embodiments, at least part of the outer wall of the stop portion 202 is hermetically adapted to the wall portion of the channel. Thus, the main cavity 101 can be sealed. Specifically, the stop portion 202 and the retaining ring 202a form an annular receiving groove for receiving a rubber sealing ring. The outer wall of the retaining ring 202a is the same as that of the stop portion 202 in the radial direction, and the outer wall of the retaining ring 202a is inclined at 75°.

[0070] In this article, specific examples are used to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the core idea of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can be made to 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 loading device, characterized in that: The invention comprises a cylinder body (100), a push rod (200), and a lock structure (300) capable of radial deformation, wherein the cylinder body (100) is provided with a main cavity (101) and a channel (102) which are connected to each other, the push rod (200) is capable of moving along the channel (102), and a portion of the channel (102) is radially concave outward to form a groove (102b) for accommodating the lock structure (300); The lock structure (300) comprises a plurality of petal portions (301), the petal portions (301) being arranged around the push rod (200), and each of the petal portions (301) having a head end (301-1) and a tail end (301-2) which are axially opposite to each other; the tail end (301-2) and the groove wall of the groove portion (102b) are at least axially opposed to each other, and the head end (301-1) can be radially turned outward to an unlocking position or radially turned inward to a locking position, and the push rod (200) comprises a stop portion (202), and in the locking position, the head end (301-1) and the stop portion (202) are axially opposed to each other.

2. The triaxial ultra-high pressure holding loading device according to claim 1 is characterized in that: The lock structure (300) comprises a closed-loop first spring (302), wherein the first spring (302) is arranged on an outer side wall of the petal portion (301) close to the first end (301-1) to apply an inward elastic force to the petal portion (301).

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

4. The triaxial ultra-high pressure holding loading device according to claim 3 is characterized in that: The lock structure (300) comprises a closed-loop tail spring (303), wherein the tail spring (303) is arranged on an inner side surface (301a) of the petal portion (301) close to the tail end (301-2) to apply an outward elastic force to the petal portion (301).

5. The triaxial ultra-high pressure holding 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).

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

7. The triaxial ultra-high pressure holding loading device according to claim 6 is characterized in that: The end of the unlocking tube (200-2) is provided with a first inclined surface adapted to the inner wall of the petal portion (301), and the radial dimension of the first inclined surface increases from a side close to the main cavity (101) toward a side away from the main cavity (101).

8. The triaxial ultra-high pressure maintaining loading device according to any one of claims 1 to 5, characterized in that: The end of the stopper (202) close to the main cavity (101) is provided with a second inclined surface adapted to match the inner wall of the petal portion (301).

9. The triaxial ultra-high pressure maintaining loading device according to any one of claims 1 to 5, characterized in that: It also comprises a driving member and a transfer tube (200-1), wherein the transfer tube (200-1) is directly or indirectly connected to the output end of the driving member, and the transfer tube (200-1) is detachably connected to the push rod (200).

10. The triaxial ultra-high pressure maintaining loading device according to any one of claims 1 to 5, characterized in that: In the radial direction, the stopper (202) is sealingly adapted to the wall of the channel (102).

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