A compression-shear testing machine with adjustable sealing performance

Abstract

The present invention relates to mechanical testing equipment, and particularly to a compression-shear testing machine with adjustable sealing performance, which includes a driving oil cylinder. The driving oil cylinder includes a housing assembly, and the housing assembly includes a cylinder barrel and a first end cover and a second end cover respectively connected to both ends of the cylinder barrel; a piston assembly, which includes a rotary sliding piston and a sealing ring, and the sealing ring is sleeved on the outer periphery of the rotary sliding piston to seal the rotary sliding piston and the cylinder barrel; a piston rod, which is fixedly connected to the piston assembly; wherein, when the piston assembly slides from the first end cover towards the second end cover direction from a stationary state, the rotary sliding piston performs a horizontal rotary motion and a vertical sliding motion, and the piston rod performs a vertical sliding motion under the sliding of the piston assembly; the driving oil cylinder provided by the present invention, at the moment when the piston starts, the piston first performs a rotary motion, so that the state between the piston and the cylinder barrel is a dynamic friction state, and then the piston performs a vertical sliding motion. There will be no situation of piston creep when the piston starts, thus avoiding the sealing failure caused by the distortion of the sealing ring.

Description

Technical Field

[0001] The present invention relates to a mechanical testing device, and more particularly to a compression-shear testing machine with adjustable sealing performance and a driving oil cylinder for driving the compression-shear testing machine, belonging to the technical field of testing devices. Background Art

[0002] Compression-shear testing machines are commonly used to measure the physical properties of materials. In some fields such as the field of building structures, compression-shear testing machines can be used to test the compressive and shear resistance of materials. Its working principle is to provide pressure through a hydraulic system so that the test material is subjected to compressive and shear forces. In a compression-shear testing machine, a vertically installed driving oil cylinder is used to provide vertical pressure.

[0003] The driving oil cylinder drives the piston to slide through the hydraulic oil in the cylinder barrel. The seal between the piston and the cylinder barrel is usually achieved through a sealing ring on the periphery of the piston. In some cases, when the piston starts from a stationary state, the sealing ring on the periphery of the piston often twists due to static friction, resulting in poor sealing and oil leakage; in addition, after long-term use, the sealing ring will also cause poor sealing and oil leakage due to wear. These all affect the loading capacity of the driving oil cylinder, thereby affecting the working performance of the compression-shear testing machine. Summary of the Invention

[0004] Based on this, in order to improve the sealing effect between the piston and the cylinder barrel, the present invention provides a compression-shear testing machine and a driving oil cylinder for driving the compression-shear testing machine.

[0005] The above object is achieved by the following technical solutions:

[0006] A first aspect of the present invention provides a driving oil cylinder, comprising: a housing assembly, the housing assembly includes a cylinder barrel and a first end cap and a second end cap respectively connected to both ends of the cylinder barrel; a piston assembly, including a rotating and sliding piston and a sealing ring, the sealing ring is sleeved on the outer periphery of the rotating and sliding piston to seal the rotating and sliding piston and the cylinder barrel; a piston rod, fixedly connected to the piston assembly; wherein, when the piston assembly slides from the first end cap towards the second end cap direction from a stationary state, the rotating and sliding piston performs a horizontal rotational movement and a vertical sliding movement, and the piston rod performs a vertical sliding movement under the sliding of the piston assembly.

[0007] Further, the piston assembly further includes a connecting column, a first piston and a second piston. The two ends of the connecting column are respectively fixedly connected to the first piston and the second piston. The rotating and sliding piston is sleeved on the connecting column. Along the sliding direction of the piston assembly, the rotating and sliding piston is located between the first piston and the second piston.

[0008] Further, the first piston includes a third port, and the piston assembly further includes a rotary sliding drive mechanism. Under the hydraulic drive of the third port, the rotary sliding drive mechanism drives the rotary sliding piston to perform horizontal rotational movement and vertical sliding movement.

[0009] Further, the rotary sliding drive mechanism includes a drive plate and a ball hinge connecting rod. The drive plate is sleeved on the connecting column and is vertically slidably connected to the inside of the first piston. The two ends of the ball hinge connecting rod are respectively hinged to the drive plate and the rotary sliding piston.

[0010] Further, the rotary sliding drive mechanism further includes a first elastic member. The first elastic member is sleeved on the connecting column, and the two ends of the first elastic member respectively abut against the drive plate and the rotary sliding piston; and / or,

[0011] The piston assembly further includes a second elastic member. The second elastic member is sleeved on the connecting column, and the two ends of the second elastic member respectively abut against the rotary sliding piston and the second piston.

[0012] Further, the longitudinal section of the rotary sliding piston is an inverted trapezoid. A V-shaped opening is provided on the side of the second piston facing the rotary sliding piston, and at least a part of the bottom of the rotary sliding piston extends into the V-shaped opening of the second piston.

[0013] Further, the first piston is in a cylindrical shape and includes a bottom cylinder, an inner cylinder, and an outer cylinder. The diameter of the inner cylinder is smaller than that of the outer cylinder. The third port penetrates through the bottom cylinder. The rotary sliding drive mechanism is arranged in the inner cylinder, and at least a part of the outer wall of the rotary sliding piston abuts against the outer cylinder.

[0014] Further, the drive oil cylinder further includes a seal adjustment mechanism. The seal adjustment mechanism includes a first adjustment hole and a first adjustment rod movably connected to the first adjustment hole. The first adjustment hole is opened on the cylinder wall of the outer cylinder. The first adjustment rod includes a first end and a second end. The first end can extend out of the first adjustment hole and abut against the rotary sliding piston, and the second end can extend into the seal cavity defined by the first end cover and the first piston.

[0015] Further, the first end cover includes a second adjustment hole and a second adjustment rod movably connected to the second adjustment hole. The second adjustment rod includes a third end and a fourth end. The third end extends into the seal cavity between the first end cover and the first piston, and the fourth end extends out of the first end cover.

[0016] The second aspect of the present invention provides a compression-shear testing machine, comprising: a driving oil cylinder fixing mechanism, including a frame and a fixing table, wherein the fixing table is fixedly connected to the frame; a driving oil cylinder as provided in the first aspect of the present invention, the driving oil cylinder being fixedly connected to the fixing table; a shearing mechanism, including a base, a shearing pushing assembly and a shearing clamping assembly.

[0017] The beneficial effects of the present invention are:

[0018] For the driving oil cylinder provided by the present invention, in addition to the cylinder barrel and the first end cover and the second end cover respectively connected to both ends of the cylinder barrel, the piston assembly of the driving oil cylinder includes a rotating sliding piston and a sealing ring. The sealing ring is sleeved on the outer periphery of the rotating sliding piston to seal the rotating sliding piston and the cylinder barrel. When the piston assembly slides from the first end cover towards the second end cover in a static state, the rotating sliding piston performs a horizontal rotational movement and a vertical sliding movement. Compared with the driving oil cylinder in the related art, for the driving oil cylinder provided by the present invention, at the moment when the piston starts, the piston first performs a rotational movement, making the state between the piston and the cylinder barrel a dynamic friction state, and then the piston performs a vertical sliding. Because the piston does not directly convert from a static friction state to a vertical sliding, therefore, the piston will not have a camming situation during startup, avoiding the sealing ring from being distorted and resulting in sealing failure. Description of the Drawings

[0019] Figure 1 is a schematic structural diagram of the compression-shear testing machine in an embodiment of the present invention;

[0020] Figure 2 is Figure 1 a schematic structural diagram of the compression-shear testing machine shown in another perspective;

[0021] Figure 3 is Figure 2 a sectional view of the structure shown in the A-A direction;

[0022] Figure 4 is Figure 3 a partially enlarged view of the structure shown at position A;

[0023] Figure 5 is Figure 3 a partially enlarged view of the structure shown at position B.

[0024] Wherein:

[0025] 1000. Compression-shear testing machine; 100. Driving oil cylinder; 110. Housing assembly; 111. Cylinder barrel; 112. First end cover; 113. Second end cover; 1131. Main body part; 1132. Insertion part; 114. First port; 115. Second port; 116. Fourth port; 120. Piston assembly; 121. Rotary sliding piston; 122. Sealing ring; 123. Connecting column; 124. First piston; 1241. Third port; 1242. Bottom of cylinder; 1243. Inner cylinder; 1244. Outer cylinder; 125. Second piston; 126. Rotary sliding driving mechanism; 1261. Driving plate; 1262. Ball hinge connecting rod; 1263. First elastic member; 127. Second elastic member; 130. Piston rod; 131. Pushing plate; 140. Sealing adjustment mechanism; 141. First adjustment hole; 142. First adjustment rod; 1421. First end; 1422. Second end; 143. Second adjustment hole; 144. Second adjustment rod; 1441. Third end; 1442. Fourth end; 200. Driving oil cylinder fixing mechanism; 210. Frame; 220. Fixed table; 300. Shearing mechanism; 310. Base; 311. Lower bearing plate; 320. Shearing pushing assembly; 330. Shearing clamping assembly. Detailed implementation manners

[0026] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0027] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequential or technical meanings. The "connection" and "coupling" mentioned in the present invention, unless otherwise specified, both include direct and indirect connection (coupling). In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0028] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0029] Please refer to Figure 1 and Figure 2 , a compression-shear testing machine 1000 provided by this embodiment includes: a driving oil cylinder 100, a driving oil cylinder fixing mechanism 200, and a shearing mechanism 300. The driving oil cylinder 100 is fixed on the driving oil cylinder fixing mechanism 200. When performing a shearing test, a specimen is placed flat on the specimen bearing platform, and a pressure is applied to the specimen in the vertical direction by the driving oil cylinder 100, while the shearing mechanism 300 applies a shearing force to the specimen in the horizontal direction.

[0030] The driving oil cylinder fixing mechanism 200 includes a frame 210 and a fixing table 220. The frame 210 is fixedly connected to the fixing table 220, and the driving oil cylinder 100 is fixedly connected to the fixing table 220. In this way, the driving oil cylinder 100 can be stably supported by the driving oil cylinder fixing mechanism.

[0031] In some embodiments, one or more frames 210 may be provided to support the fixing table 220;

[0032] In some embodiments, a pressure sensor may be provided on the frame 210 to measure the magnitude of the pressure applied by the driving oil cylinder 100.

[0033] The shearing mechanism 300 includes a base 310, a shearing pushing assembly 320, and a shearing clamping assembly 330; the base 310 can be used to mount the shearing pushing assembly 320 and the shearing clamping assembly 330. The shearing pushing assembly 320 can generate a shearing force on the specimen in the horizontal direction, and the shearing clamping assembly 330 can be used to limit the position of the specimen. A lower bearing plate 311 is further provided on the base 310. The lower bearing plate 311 can serve as the specimen bearing platform for bearing the specimen.

[0034] In some embodiments, the shearing pushing assembly 320 may include a shearing driving mechanism, a shearing sensor, and a shearing plate; the shearing driving mechanism includes a shearing oil cylinder, and the shearing oil cylinder can push against the shearing plate to apply a shearing force to the specimen through the shearing plate; the shearing sensor can be disposed on the shearing oil cylinder to measure the magnitude of the shearing force.

[0035] Please continue to refer to Figure 1 andFigure 2 Taking the direction shown in the figure as an example, in this embodiment, the upper end of the driving oil cylinder 100 is fixed on the driving oil cylinder fixing mechanism 200, and the lower end of the driving oil cylinder 100 is used to provide pressure to the specimen.

[0036] Please refer to Figure 2 、 Figure 3 and Figure 4 , Figure 3 is Figure 2 the sectional view of the structure shown in the A-A direction, Figure 4 is Figure 3 the partial enlarged view of the structure shown in the A position; in this embodiment, the driving oil cylinder 100 includes a housing assembly 110, a piston assembly 120 and a piston rod 130. The piston assembly 120 is installed in the cylinder barrel 111 defined by the housing assembly 110. One end of the piston rod 130 is fixedly connected to the piston assembly 120, and the other end of the piston rod 130 extends out of the cylinder barrel and is fixedly connected to the push plate 131. Driven by the piston assembly 120, the piston rod 130 slides in the cylinder barrel 111, thereby driving the push plate 131 to move to apply a vertical pressure to the specimen.

[0037] The housing assembly 110 includes a cylinder barrel 111 and a first end cover 112 and a second end cover 113 respectively connected to both ends of the cylinder barrel 111. A first port 114 is provided on the first end cover 112, and a second port 115 is provided on the second end cover 113. The first port 114 and the second port 115 can be respectively used for hydraulic oil to enter or flow out of the cylinder barrel. By the inflow or outflow of the hydraulic oil, the pressure in the cylinder barrel 111 is changed to drive the piston rod to slide.

[0038] Please refer to Figure 4 ,the piston assembly 120 includes a rotary sliding piston 121 and a sealing ring 122. The sealing ring 122 is sleeved on the outer periphery of the rotary sliding piston 121, and the outer periphery of the sealing ring 122 can abut against the inner wall of the cylinder barrel 111. Therefore, the gap between the rotary sliding piston 121 and the inner wall of the cylinder barrel 111 can be sealed to prevent the hydraulic oil from leaking between the rotary sliding piston 121 and the inner wall of the cylinder barrel 111.

[0039] It should be emphasized that the rotary sliding piston 121 in this embodiment can perform a rotational movement in the horizontal direction and a sliding movement in the vertical direction relative to the inner wall of the cylinder barrel 111; specifically, when the driving oil cylinder is started, as the hydraulic oil accumulates in the upper space of the cylinder barrel 111, the piston assembly 120 is subjected to an increasing hydraulic pressure from above. Under the action of the hydraulic pressure, the movement of the rotary sliding piston 121 is divided into two stages. In the first stage, the rotary sliding piston 121 performs a rotational movement in the horizontal direction and a sliding movement in the vertical direction simultaneously; after a certain period of time and distance, the movement of the rotary sliding piston 121 enters the second stage. In the second stage, the rotary sliding piston 121 stops rotating and only performs a sliding movement in the vertical direction. After the rotary sliding piston 121 generates a sliding movement in the vertical direction, the piston rod 130 starts to move downward under the vertical sliding of the piston assembly 120, so as to apply a vertical pressure to the specimen on the lower bearing plate 311.

[0040] In the related art, the piston can only perform a sliding movement in the vertical direction within the cylinder barrel. Therefore, when the driving oil cylinder is started, under the drive of the hydraulic oil, the piston directly starts to slide vertically from the stationary state. At this time, because the static friction is greater than the dynamic friction, when the piston is accelerated and pushed out at the moment of injecting the hydraulic oil, the piston undergoes a crosstalk. The crosstalk easily causes the sealing ring between the sealing piston and the cylinder barrel to flip, thereby destroying the sealing effect of the sealing ring, and the hydraulic oil is also likely to leak, thus affecting the normal operation of the driving oil cylinder.

[0041] In this embodiment, due to the setting of the rotary sliding piston 121, when the piston assembly 120 starts from the stationary state and is accelerated and pushed out at the moment of injecting the hydraulic oil, the rotary sliding piston 121 will rotate relative to the cylinder barrel 111. Therefore, a dynamic friction is generated between the piston assembly 120 and the cylinder barrel 111. When the piston assembly 120 starts to slide vertically, since the piston assembly 120 does not start to slide vertically from the stationary state, but from the rotational movement state, there is no conversion from static friction to dynamic friction. Therefore, the possibility of the piston undergoing crosstalk is reduced, which can effectively prevent the sealing ring 122 between the rotary sliding piston 121 and the cylinder barrel 111 from flipping, ensuring that the sealing ring 122 can always play a good sealing role and guaranteeing the normal operation of the driving oil cylinder.

[0042] Please continue to refer to Figure 4 , the piston assembly 120 further includes a connecting column 123, a first piston 124, and a second piston 125. The two ends of the connecting column 123 are respectively fixedly connected to the first piston 124 and the second piston 125.

[0043] In some embodiments, threaded structures may be provided at both ends of the connecting column 123, and threaded holes are provided at the bottom of the first piston 124 and the top of the second piston 125. Through the cooperation of the threaded structure and the threaded hole, the two ends of the connecting column 123 are detachably and fixedly connected to the first piston 124 and the second piston 125.

[0044] Of course, in some embodiments, the top end of the connecting column 123 and the first piston 124 may be integrally formed, and the bottom end of the connecting column 123 is threadedly connected to the second piston 125.

[0045] It is easy to understand that due to the existence of the connecting column 123, the distance between the first piston 124 and the second piston 125 is fixed. The sliding of the first piston 124 will drive the second piston 125 to slide synchronously in the cylinder. Since the bottom of the second piston 125 is fixedly connected to the piston rod 130, when the second piston 125 slides in the cylinder, the piston rod 130 is driven by the second piston 125 to achieve synchronous movement.

[0046] Please continue to refer to Figure 4 , the rotating sliding piston 121 is sleeved on the connecting column 123. Along the sliding direction of the piston assembly 120, that is, the up and down direction in the figure, the rotating sliding piston 121 is located between the first piston 124 and the second piston 125.

[0047] In some embodiments, a through hole (not shown in the figure) is provided in the middle of the rotating sliding piston 121. Through the through hole, the rotating sliding piston 121 is sleeved on the connecting column 123. When the rotating sliding piston 121 moves, the rotating sliding piston 121 can rotate and move vertically relative to the connecting column 123, and the connecting column 123 provides movement limits for the rotating sliding piston 121.

[0048] In order to enable the rotating sliding piston 121 to achieve rotational movement and vertical movement, the present embodiment further provides a rotating sliding driving mechanism 126, and the rotating sliding driving mechanism 126 is used to drive the rotating sliding piston 121 to achieve rotational movement in the horizontal direction and sliding in the vertical direction.

[0049] Specifically, the rotary sliding drive mechanism 126 is disposed between the first piston 124 and the rotary sliding piston 121. The rotary sliding drive mechanism 126 includes a drive plate 1261 and a ball hinge connecting rod 1262. The drive plate 1261 is sleeved on the connecting column 123 and can slide vertically along the axial direction of the connecting column 123. The two ends of the ball hinge connecting rod 1262 are respectively hinged to the drive plate 1261 and the rotary sliding piston 121. It is easy to understand that due to the existence of the ball hinge connecting rod 1262, when the drive plate 1261 moves vertically downward, the ball hinge connecting rod 1262 will exert an oblique acting force on the rotary sliding piston 121. On the one hand, this oblique acting force will drive the rotary sliding piston 121 to twist relative to the connecting column 123 and rotate horizontally, and on the other hand, it will drive the rotary sliding piston 121 to move downward relative to the connecting column 123 and slide vertically, thereby enabling the rotary sliding piston 121 to achieve rotational motion in the horizontal direction and sliding motion in the vertical direction.

[0050] In order to ensure that the drive plate 1261 can always maintain vertical movement without tilting or rotating, in some embodiments, a plurality of ball hinge connecting rods 1262 can be provided, and the number of ball hinge connecting rods 1262 includes three, four, etc. In addition, splines can be provided on the outer periphery of the drive plate 1261 to be keyed to the inner wall of the first piston 124 to prevent the drive plate 1261 from rotating.

[0051] In some embodiments, in order to be able to apply a vertically downward force to the drive plate 1261, a third port 1241 is provided at the top of the first piston 124. After the hydraulic oil enters the sealed cavity defined by the first end cover 112, the first piston 124, and the cylinder barrel 111 through the first port 114 opened on the first end cover 112, as the hydraulic oil continues to increase, the pressure in the sealed cavity continuously increases, and the hydraulic oil passing through the third port 1241 will act on the drive plate 1261, thereby driving the drive plate 1261 to start moving downward.

[0052] In some embodiments, the rotary sliding drive mechanism 126 further includes a first elastic member 1263. The first elastic member 1263 is sleeved on the connecting column 123, and the two ends of the first elastic member 1263 respectively abut against the drive plate 1261 and the rotary sliding piston 121. Due to the existence of the first elastic member 1263, it can ensure that the drive plate 1261 and the rotary sliding piston 121 are always supported by the first elastic member 1263, avoiding the shaking of the drive plate 1261 and the ball hinge connecting rod 1262.

[0053] In some embodiments, in order to support the rotary sliding piston 121, the piston assembly 120 further includes a second elastic member 127. The second elastic member 127 is sleeved on the connecting column 123, and two ends of the second elastic member 127 respectively abut against the bottom of the rotary sliding piston 121 and the top of the second piston 125. Due to the support of the second elastic member 127, there is a certain distance between the bottom of the rotary sliding piston 121 and the top of the second piston 125, and the swaying of the rotary sliding piston 121 is avoided.

[0054] It is not difficult to understand that in the piston assembly 120 of the present invention, under the action of hydraulic oil, the rotary sliding piston 121 is driven by the rotary sliding driving mechanism 126 to perform rotary motion and vertical sliding in the first stage. After vertical sliding for a certain time and distance, due to the first elastic member 1263 between the rotary sliding piston 121 and the first piston 124, and the second elastic member 127 between the rotary sliding piston and the second piston 125 cannot continue to be shortened continuously due to extrusion, the first piston 124 and the second piston 125 begin to vertically slide synchronously with the rotary sliding piston 121, and then drive the piston rod 130 to move downward.

[0055] Please continue to refer to Figure 4 , a V-shaped opening is provided on the side of the second piston 125 facing the rotary sliding piston. At least part of the bottom of the rotary sliding piston 121 extends into the V-shaped opening of the second piston 125. Since there is a certain distance between the bottom of the rotary sliding piston 121 and the top of the second piston, when the rotary sliding piston 121 moves vertically downward, the depth of the bottom of the rotary sliding piston 121 extending into the V-shaped opening of the second piston 125 increases.

[0056] In some embodiments, the longitudinal section of the rotary sliding piston 121 is an inverted trapezoid. In other words, the outer peripheral surface of the rotary sliding piston 121 is inclined. The rotary sliding piston 121 is an inverted conical body, which can also be called an inverted frustum of a cone. The diameter of the upper end of the rotary sliding piston 121 is larger than that of the lower end, and the sealing ring is sleeved on the inclined outer peripheral surface. With such a setting, when the rotary sliding piston 121 moves vertically downward, due to the increase in the diameter of the outer peripheral surface of the rotary sliding piston 121, the rotary sliding piston 121 will continue to squeeze the sealing ring in the horizontal direction, improving the sealing performance of the sealing ring, thereby preventing oil leakage between the sealing ring and the cylinder wall.

[0057] Of course, in some embodiments, the longitudinal section of the rotary sliding piston 121 can also be a rectangle. In other words, the outer peripheral surface of the rotary sliding piston 121 is not inclined. The rotary sliding piston 121 is a cylinder, and the sealing ring is sleeved on the surface of the cylinder.

[0058] In some embodiments, the first piston 124 is cylindrical, including a bottom 1242, an inner cylinder 1243 and an outer cylinder 1244. The diameter of the inner cylinder 1243 is smaller than that of the outer cylinder 1244. The third port 1241 penetrates through the bottom 1242. The rotary sliding drive mechanism 126 is disposed in the inner cylinder 1243. At least a part of the outer wall of the rotary sliding piston 121 abuts against the outer cylinder 1244.

[0059] Please continue to refer to Figure 4 , the upper part of the outer wall of the rotary sliding piston 121 abuts against the inner wall of the outer cylinder 1244. A sealing ring is sleeved on the middle part of the outer wall of the rotary sliding piston 121 and abuts against the inner wall of the cylinder barrel. The lower part of the outer wall of the rotary sliding piston 121 extends into the V-shaped opening of the second piston 125.

[0060] In the related art, due to the long-term use of the drive oil cylinder, the sealing ring deteriorates in sealing ability due to wear. In order to ensure the normal operation of the drive oil cylinder, it is necessary to disassemble the drive oil cylinder to replace the sealing ring, resulting in relatively high labor and material costs.

[0061] In this application, a sealing adjustment mechanism is provided on the drive oil cylinder, which can adjust the sealing performance of the sealing ring without disassembling the drive oil cylinder, saving the maintenance time of the drive oil cylinder.

[0062] Please continue to refer to Figure 4 , the drive oil cylinder 100 further includes a sealing adjustment mechanism 140. The sealing adjustment mechanism 140 includes a first adjustment hole 141 and a first adjustment rod 142 movably connected to the first adjustment hole 141. The first adjustment hole 141 is opened on the barrel wall of the outer cylinder 1244. The first adjustment rod 142 includes a first end 1421 and a second end 1422. The first end 1421 can extend out of the first adjustment hole 141 and abut against the rotary sliding piston 121, and the second end 1422 can extend into the sealing cavity defined by the first end cap 112 and the first piston 124. With such a setting, by adjusting the length of the first adjustment rod 142 extending downward out of the first adjustment hole 141, the position of the rotary sliding piston 121 relative to the first piston 124 and the second piston 125 can be adjusted. After the sealing ring is worn due to long-term use, by increasing the length of the first adjustment rod 142 extending downward out of the first adjustment hole 141, the rotary sliding piston 121 moves downward relative to the second piston 125. Since the diameter of the outer peripheral surface of the rotary sliding piston 121 increases, the rotary sliding piston 121 will continue to squeeze the sealing ring in the horizontal direction, improving the sealing performance of the sealing ring and compensating for the decrease in the sealing ability of the sealing ring due to wear, thereby preventing oil leakage between the sealing ring and the barrel wall.

[0063] In some embodiments, the seal adjustment mechanism 140 further includes a second adjustment hole 143 and a second adjustment rod 144 movably connected to the second adjustment hole 143. The second adjustment hole 143 is formed in the first end cap 112 and penetrates through the first end cap 112. The second adjustment rod 144 includes a third end 1441 and a fourth end 1442. The third end 1441 extends into the sealing cavity defined by the first end cap 112 and the first piston 124, and the fourth end 1442 extends out of the first end cap 112.

[0064] When it is necessary to adjust the sealing performance of the sealing ring, the piston assembly 120 is driven upward so that the third end 1441 of the second adjustment rod 144 engages with the second end 1422 of the first adjustment rod 142. By adjusting the third end 1441 of the second adjustment rod 144, the first end 1421 of the first adjustment rod 142 is adjusted.

[0065] In some embodiments, in order to enable the piston assembly 120 to move upward, a second port 115 perpendicular to the axial direction of the piston rod 130 is formed in the main body portion 1131, and a fourth port 116 parallel to the axial direction of the piston rod 130 is formed in the extending portion 1132. The second port 115 communicates with the fourth port 116 inside the second end cap 113. When hydraulic oil is injected from the second port 115, after the hydraulic oil flows into the inside of the second end cap in the horizontal direction through the second port 115, it flows into the sealed space defined by the cylinder barrel 111 in the vertical direction through the fourth port 116, thereby providing hydraulic drive for the piston assembly 120 to drive the piston assembly 120 to slide upward, that is, to move from the second end cap 113 toward the first end cap 112, thereby raising the piston rod 130 and reducing the pressure of the push plate 131 on the specimen until it disengages. Thus, after the piston assembly 120 moves upward until the third end 1441 of the second adjustment rod 144 engages with the second end 1422 of the first adjustment rod 142, the staff can adjust the sealing performance of the sealing ring.

[0066] In some embodiments, the second end 1422 includes a cross-shaped recess, the third end 1441 includes a cross-shaped protrusion, and the fourth end 1442 includes a wrench. The staff can rotate the wrench outside the first end cap 112 to drive the first adjustment rod 142 to rotate by the second adjustment rod 144. Thus, when it is necessary to adjust the sealing performance of the sealing ring, there is no need to open the first end cap 112, which simplifies the operation.

[0067] Please refer to Figure 5 In some embodiments, the second end cap 113 includes a main body portion 1131 and an extending portion 1132. The second end cap 113 is in an inverted T shape. Among them, the main body portion 1131 and the extending portion 1132 are provided with through holes for the piston rod 130 to slide, and the extending portion 1132 extends into the cylinder barrel 111 and is sealingly connected to the inner wall of the cylinder barrel 111.

[0068] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered that the scope described in this specification is covered.

[0069] The above-described embodiments merely represent several implementation manners of the present invention, and the description thereof is relatively specific and detailed. However, it should not be construed as a limitation on the scope of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the appended claims.

Claims

1. An adjustable sealing compression-shear testing machine, comprising a driving oil cylinder (100), characterized in that, The driving oil cylinder (100) includes: A housing assembly (110), which includes a cylinder barrel (111) and a first end cap (112) and a second end cap (113) respectively connected to both ends of the cylinder barrel (111); A piston assembly (120), including a rotary sliding piston (121) and a sealing ring (122). The sealing ring (122) is sleeved on the outer periphery of the rotary sliding piston (121) to seal the rotary sliding piston (121) and the cylinder barrel (111); A piston rod (130), fixedly connected to the piston assembly (120); Wherein, when the piston assembly (120) slides from the first end cap (112) towards the second end cap (113) from a stationary state, the rotary sliding piston (121) undergoes a horizontal rotational movement and a vertical sliding movement, and the piston rod (130) undergoes a vertical sliding movement under the sliding of the piston assembly (120); The piston assembly (120) further includes a connecting column (123), a first piston (124) and a second piston (125). Both ends of the connecting column (123) are fixedly connected to the first piston (124) and the second piston (125) respectively. The rotary sliding piston (121) is sleeved on the connecting column (123). Along the sliding direction of the piston assembly (120), the rotary sliding piston (121) is located between the first piston (124) and the second piston (125); the bottom of the second piston (125) is fixedly connected to the piston rod (130); A seal adjustment mechanism (140), which includes a first adjustment hole (141) and a first adjustment rod (142) movably connected to the first adjustment hole (141). The seal adjustment mechanism (140) can move the rotary sliding piston (121) downward relative to the second piston (125) to squeeze the sealing ring (122) in the horizontal direction and improve the sealing performance of the sealing ring (122).

2. The adjustable sealing shear press testing machine according to claim 1, wherein, The first piston (124) includes a third port (1241). The piston assembly (120) further includes a rotary sliding driving mechanism (126). Under the hydraulic driving action of the third port (1241), the rotary sliding driving mechanism (126) drives the rotary sliding piston (121) to undergo a horizontal rotational movement and a vertical sliding movement.

3. The compression-shear testing machine with adjustable sealing performance according to claim 2, wherein The rotary sliding driving mechanism (126) includes a driving plate (1261) and a ball hinge connecting rod (1262). The driving plate (1261) is sleeved on the connecting column (123) and is vertically slidably connected to the inside of the first piston (124). Both ends of the ball hinge connecting rod (1262) are respectively hinged to the driving plate (1261) and the rotary sliding piston (121).

4. The compression-shear testing machine with adjustable sealing performance according to claim 3, wherein the rotary sliding drive mechanism (126) further comprises a first elastic member (1263), the first elastic member (1263) is sleeved on the connecting column (123), and two ends of the first elastic member (1263) respectively abut against the drive plate (1261) and the rotary sliding piston (121); and / or, The piston assembly (120) further comprises a second elastic member (127), the second elastic member (127) is sleeved on the connecting column (123), and two ends of the second elastic member (127) respectively abut against the rotary sliding piston (121) and the second piston (125).

5. The compression-shear testing machine with adjustable sealing performance according to claim 1, wherein, The longitudinal section of the rotary sliding piston (121) is an inverted trapezoid, a V-shaped opening is arranged on one side of the second piston (125) facing the rotary sliding piston (121), and at least part of the bottom of the rotary sliding piston (121) extends into the V-shaped opening of the second piston (125).

6. The adjustable-sealing compression-shear testing machine according to claim 2, wherein The first piston (124) is in a cylindrical shape and comprises a cylinder bottom (1242), an inner cylinder (1243) and an outer cylinder (1244), the diameter of the inner cylinder (1243) is smaller than that of the outer cylinder (1244), the third port (1241) penetrates through the cylinder bottom (1242), the rotary sliding drive mechanism (126) is arranged in the inner cylinder (1243), and at least part of the outer wall of the rotary sliding piston (121) abuts against the outer cylinder (1244).

7. The compression-shear testing machine with adjustable sealing performance according to claim 6, wherein, The first adjusting hole (141) is formed in the cylinder wall of the outer cylinder (1244), the first adjusting rod (142) comprises a first end (1421) and a second end (1422), the first end (1421) can extend out of the first adjusting hole (141) and abut against the rotary sliding piston (121), and the second end (1422) can extend into the sealing cavity defined by the first end cover (112) and the first piston (124).

8. The adjustable sealing shear press testing machine according to claim 7, wherein, The first end cover (112) comprises a second adjusting hole (143) and a second adjusting rod (144) movably connected to the second adjusting hole (143), the second adjusting rod (144) comprises a third end (1441) and a fourth end (1442), the third end (1441) extends into the sealing cavity of the first end cover (112) and the first piston (124), and the fourth end (1442) extends out of the first end cover (112).

9. The adjustable sealing shear press tester according to claim 1, characterized in that, Further comprising: A drive oil cylinder fixing mechanism (200), comprising a frame (210) and a fixing table (220), the fixing table (220) is fixedly connected to the frame (210), and the drive oil cylinder (100) is fixedly connected to the fixing table (220); A shearing mechanism (300), comprising a base (310), a shearing pushing assembly (320) and a shearing clamping assembly (330).

Images