Pressure-shear testing machine capable of adjusting sealing performance

Abstract

The invention relates to mechanical testing equipment, in particular to a sealing performance adjustable compression shear testing machine which comprises a driving oil cylinder, the driving oil cylinder comprises a shell assembly, and the shell assembly comprises a cylinder barrel and a first end cover and a second end cover which are connected with the two ends of the cylinder barrel respectively; the piston assembly comprises a rotary sliding piston and a sealing ring, and the sealing ring is arranged on the periphery of the rotary sliding piston in a sleeving mode to seal the rotary sliding piston and the cylinder barrel; the piston rod is fixedly connected with the piston assembly; when the piston assembly slides from the first end cover to the second end cover from the static state, the rotary sliding piston rotates horizontally and slides vertically, and the piston rod slides vertically under sliding of the piston assembly. According to the driving oil cylinder, at the moment when the piston is started, the piston firstly rotates, so that the piston and the cylinder barrel are in a dynamic friction state, then the piston vertically slides, the piston does not move when being started, and sealing failure caused by twisting of the sealing ring is avoided.

Description

Technical Field

[0001] The invention relates to a mechanical testing device, in particular 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 equipment. Background Art

[0002] Compression shear testing machines are commonly used to measure the physical properties of materials. In some fields such as building structures, compression shear testing machines can be used to test the compression and shear resistance of materials. Its working principle is to provide pressure through a hydraulic system to subject the test material to compression and shear force. In the compression shear testing machine, a vertically mounted drive cylinder is used to provide vertical pressure.

[0003] The driving cylinder drives the piston to slide through the hydraulic oil in the cylinder barrel, and the piston and the cylinder barrel are usually sealed by the sealing ring around the piston. In some cases, when the piston starts from a stationary state, the sealing ring around the piston is often distorted 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 cylinder, thereby affecting the working performance of the compression shear tester. Summary of the invention

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

[0005] The above purpose is achieved through the following technical solutions: The first aspect of the present invention provides a driving cylinder, comprising: a shell assembly, the shell assembly comprising a cylinder barrel and a first end cover and a second end cover respectively connected to the two ends of the cylinder barrel; a piston assembly, comprising a rotary sliding piston and a sealing ring, the sealing ring being sleeved on the outer circumference of the rotary sliding piston to seal the rotary 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 cover toward the second end cover from a stationary state, the rotary sliding piston undergoes horizontal rotational motion and vertical sliding motion, and the piston rod undergoes vertical sliding motion under the sliding of the piston assembly.

[0006] Furthermore, the piston assembly also 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 sliding piston is sleeved on the connecting column, and along the sliding direction of the piston assembly, the rotating sliding piston is located between the first piston and the second piston.

[0007] Furthermore, the first piston includes a third port, and the piston assembly also 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 rotary motion and vertical sliding motion.

[0008] Furthermore, the rotary sliding drive mechanism includes a drive plate and a ball joint connecting rod, the drive plate is sleeved on the connecting column and is vertically slidably connected to the inside of the first piston, and the two ends of the ball joint connecting rod are respectively hinged to the drive plate and the rotary sliding piston.

[0009] Furthermore, the rotary sliding drive mechanism further comprises a first elastic member, the first elastic member is sleeved on the connecting column, and two ends of the first elastic member abut against the drive plate and the rotary sliding piston respectively; and / or, The piston assembly further comprises a second elastic member, the second elastic member is sleeved on the connecting column, and two ends of the second elastic member abut against the rotary sliding piston and the second piston respectively.

[0010] Furthermore, the longitudinal section of the rotary sliding piston is an inverted trapezoid, a V-shaped opening is provided on a side of the second piston facing the rotary sliding piston, and the bottom of the rotary sliding piston at least partially penetrates into the V-shaped opening of the second piston.

[0011] Furthermore, the first piston is cylindrical, including a cylinder bottom, an inner cylinder and an outer cylinder, the diameter of the inner cylinder is smaller than the diameter of the outer cylinder, the third port opening passes through the cylinder bottom, the rotary sliding drive mechanism is arranged in the inner cylinder, and the outer wall of the rotary sliding piston at least partially abuts against the outer cylinder.

[0012] Furthermore, the driving cylinder also includes a sealing adjustment mechanism, which includes a first adjustment hole and a first adjustment rod movably connected to the first adjustment hole, the first adjustment hole is opened in 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 rotating sliding piston, and the second end can penetrate into the sealing cavity defined by the first end cover and the first piston.

[0013] Furthermore, the first end cover includes a second adjustment hole and a second adjustment rod movably connected to the second adjustment hole, and the second adjustment rod includes a third end and a fourth end, the third end extends into the sealing cavity between the first end cover and the first piston, and the fourth end extends out of the first end cover.

[0014] The second aspect of the present invention provides a compression shear testing machine, comprising: a driving cylinder fixing mechanism, comprising a frame and a fixing platform, the fixing platform being fixedly connected to the frame; a driving cylinder as provided in the first aspect of the present invention, the driving cylinder being fixedly connected to the fixing platform; a shearing mechanism, comprising a base, a shearing pushing assembly and a shearing positioning assembly.

[0015] The beneficial effects of the present invention are: 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 the two 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 circumference 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 toward the second end cover from the static state, the rotating sliding piston performs horizontal rotating motion and vertical sliding motion. Compared with the driving oil cylinder in the related art, the driving oil cylinder provided by the present invention first rotates the piston at the moment of piston startup, so that the piston and the cylinder barrel are in a dynamic friction state, and then the piston slides vertically, because the piston is not directly converted from a static friction state to a vertical sliding state, therefore, the piston will not move when it is started, avoiding the distortion of the sealing ring and causing the seal to fail. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of a compression shear testing machine in one embodiment of the present invention; Figure 2 for Figure 1 The schematic diagram of the structure of the compression shear testing machine shown in another perspective; Figure 3 for Figure 2 The structure shown is a cross-sectional view in the AA direction; Figure 4 for Figure 3 A partial enlarged view of the structure shown at position A; Figure 5 for Figure 3 A partial enlarged view of the structure shown at position B.

[0017] in: 1000, compression shear tester; 100, driving oil cylinder; 110, housing assembly; 111, cylinder barrel; 112, first end cover; 113, second end cover; 1131, main body; 1132, insertion portion; 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, cylinder bottom; 1243, inner cylinder; 1244, outer cylinder; 125, second piston; 12 6. Rotary sliding drive mechanism; 1261. Drive plate; 1262. Ball joint connecting rod; 1263. First elastic member; 127. Second elastic member; 130. Piston rod; 131. Push 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. Drive cylinder fixing mechanism; 210. Frame; 220. Fixing table; 300. Shearing mechanism; 310. Base; 311. Lower bearing plate; 320. Shearing push assembly; 330. Shearing positioning assembly. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is 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.

[0019] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in the present invention, unless otherwise specified, include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, which 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.

[0020] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a 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, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0021] See also Figure 1 and Figure 2 The present embodiment provides a compression shear tester 1000, comprising: a driving cylinder 100, a driving cylinder fixing mechanism 200 and a shearing mechanism 300, wherein the driving cylinder 100 is fixed on the driving cylinder fixing mechanism 200. When performing a shearing test, the sample is placed flatly on the sample bearing platform, and the driving cylinder 100 applies pressure to the sample in a vertical direction, while the shearing mechanism 300 applies shear force to the sample in a horizontal direction.

[0022] The driving cylinder fixing mechanism 200 includes a frame 210 and a fixing platform 220. The frame 210 is fixedly connected to the fixing platform 220, and the driving cylinder 100 is fixedly connected to the fixing platform 220. In this way, the driving cylinder 100 can be stably supported by the driving cylinder fixing mechanism.

[0023] In some embodiments, the frame 210 may be provided with one or more members for supporting the fixing platform 220; In some embodiments, a pressure sensor may be provided on the frame 210 to measure the pressure applied to the driving cylinder 100 .

[0024] The shear mechanism 300 includes a base 310, a shear push assembly 320, and a shear stop assembly 330. The base 310 can be used to install the shear push assembly 320 and the shear stop assembly 330. The shear push assembly 320 can generate a shear force on the sample in the horizontal direction, and the shear stop assembly 330 can be used to limit the position of the sample. The base 310 is also provided with a lower bearing plate 311, which can be used as a sample bearing platform for bearing the sample.

[0025] In some embodiments, the shear push assembly 320 may include a shear drive mechanism, a shear sensor, and a shear plate; the shear drive mechanism includes a shear cylinder, which can push the shear plate to apply shear force to the sample through the shear plate; the shear sensor can be set on the shear cylinder to test the magnitude of the shear force.

[0026] Please continue reading Figure 1 and Figure 2Taking the direction shown in the figure as an example, the upper end of the driving cylinder 100 provided in this embodiment is fixed on the driving cylinder fixing mechanism 200, and the lower end of the driving cylinder 100 is used to provide pressure to the sample.

[0027] Please refer to Figure 2 , Figure 3 and Figure 4 , Figure 3 yes Figure 2 The structure shown is a cross-sectional view in the AA direction. Figure 4 yes Figure 3 The structure shown is a partial enlarged view at position A; in this embodiment, the driving cylinder 100 includes a housing assembly 110, a piston assembly 120 and a piston rod 130. The piston assembly 120 is installed in a 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 vertical pressure to the sample.

[0028] The housing assembly 110 includes a cylinder 111 and a first end cover 112 and a second end cover 113 respectively connected to both ends of the cylinder 111. The first end cover 112 is provided with a first port 114, and the second end cover 113 is provided with a second port 115. The first port 114 and the second port 115 can be used for hydraulic oil to enter or flow out of the cylinder, respectively, and the pressure in the cylinder 111 is changed by the inflow or outflow of hydraulic oil, thereby driving the piston rod to slide.

[0029] 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 circumference of the rotary sliding piston 121. The outer circumference of the sealing ring 122 can abut against the inner wall of the cylinder 111. Therefore, the gap between the rotary sliding piston 121 and the inner wall of the cylinder 111 can be sealed to prevent the hydraulic oil from leaking from between the rotary sliding piston 121 and the inner wall of the cylinder 111.

[0030] It should be emphasized that the rotary sliding piston 121 in the present embodiment can perform horizontal rotational motion and vertical sliding motion relative to the inner wall of the cylinder 111; specifically, when the driving cylinder is started, as the hydraulic oil in the upper space of the cylinder 111 increases, the piston assembly 120 is subjected to increasing hydraulic pressure from the upper portion. 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 horizontal rotational motion and vertical sliding motion, and the two motions are performed simultaneously. After a 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 vertical sliding motion. After the rotary sliding piston 121 generates vertical sliding motion, the piston rod 130 starts to move downward under the vertical sliding of the piston assembly 120, thereby being able to apply vertical pressure to the sample on the lower bearing plate 311.

[0031] In the related technology, the piston can only slide vertically in the cylinder. Therefore, when the driving cylinder is started, the piston starts to slide vertically directly from a stationary state under the drive of the hydraulic oil. At this time, because the static friction is greater than the dynamic friction, the piston is accelerated and pushed out at the moment of hydraulic oil injection, and the piston moves. The movement can easily cause the sealing ring between the sealing piston and the cylinder to flip, thereby destroying the sealing effect of the sealing ring. The hydraulic oil is also prone to leakage, which affects the normal operation of the driving cylinder.

[0032] In the present embodiment, due to the provision of the rotary sliding piston 121, when the piston assembly 120 starts from a stationary state, when the piston assembly 120 is accelerated and pushed out at the moment of hydraulic oil injection, the rotary sliding piston 121 will rotate relative to the cylinder barrel 111, so 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 a stationary state but starts to slide vertically from a rotational motion state, there will be no direct conversion from static friction to dynamic friction, which reduces the possibility of the piston moving, thereby effectively preventing 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, thereby ensuring the normal operation of the driving cylinder.

[0033] 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, and both ends of the connecting column 123 are fixedly connected to the first piston 124 and the second piston 125 respectively.

[0034] In some embodiments, threaded structures can be set at both ends of the connecting column 123, and threaded holes can be set 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 holes, the two ends of the connecting column 123 are detachably fixedly connected with the first piston 124 and the second piston 125.

[0035] 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 and the second piston 125 may be threadedly connected.

[0036] It is easy to understand that due to the presence of the connecting column 123, the distance between the first piston 124 and the second piston 125 is fixed, and the sliding of the first piston 124 will drive the second piston 125 to slide synchronously in the cylinder, and the bottom of the second piston 125 is fixedly connected to the piston rod 130. Therefore, when the second piston 125 slides in the cylinder, the piston rod 130 is driven by the second piston 125 to achieve synchronous movement.

[0037] Please continue to refer to Figure 4 The rotary sliding piston 121 is sleeved on the connecting column 123 , and along the sliding direction of the piston assembly 120 , that is, the up and down direction in the figure, the rotary sliding piston 121 is located between the first piston 124 and the second piston 125 .

[0038] In some embodiments, a through hole (not shown) is opened in the middle of the rotary sliding piston 121, and the rotary sliding piston 121 is sleeved on the connecting column 123 through the through hole. When the rotary sliding piston 121 moves, the rotary sliding piston 121 can rotate and vertically move relative to the connecting column 123, and the connecting column 123 provides a motion limit for the rotary sliding piston 121.

[0039] In order to enable the rotary sliding piston 121 to achieve rotational movement and vertical movement, the present embodiment further provides a rotary sliding driving mechanism 126, which is used to drive the rotary sliding piston 121 to achieve horizontal rotational movement and vertical sliding movement.

[0040] Specifically, the rotary sliding driving mechanism 126 is arranged between the first piston 124 and the rotary sliding piston 121, and the rotary sliding driving mechanism 126 includes a driving plate 1261 and a ball joint connecting rod 1262. The driving plate 1261 is sleeved on the connecting column 123 and can slide in the vertical direction along the axial direction of the connecting column 123. The two ends of the ball joint connecting rod 1262 are respectively hinged to the driving plate 1261 and the rotary sliding piston 121. It is easy to understand that due to the existence of the ball joint connecting rod 1262, when the driving plate 1261 moves vertically downward, the ball joint connecting rod 1262 will apply an oblique force to the rotary sliding piston 121. On the one hand, the oblique force will drive the rotary sliding piston 121 to twist relative to the connecting column 123 and rotate in the horizontal direction, and on the other hand, it will drive the rotary sliding piston 121 to move downward relative to the connecting column 123 and slide in the vertical direction, thereby realizing that the rotary sliding piston 121 can achieve horizontal rotation and vertical sliding.

[0041] In order to ensure that the driving plate 1261 can always maintain vertical movement without tilting or rotating, in some embodiments, multiple ball joint connecting rods 1262 may be provided, and the number of ball joint connecting rods 1262 includes three, four, etc. In addition, the outer periphery of the driving plate 1261 may be provided with splines that are keyed to the inner wall of the first piston 124 to prevent the driving plate 1261 from rotating.

[0042] In some embodiments, in order to apply a force to move the driving plate 1261 vertically downward, a third port 1241 is provided on 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 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 continues to increase, and the hydraulic oil passing through the third port 1241 will act on the driving plate 1261, thereby driving the driving plate 1261 to start moving downward.

[0043] In some embodiments, the rotary sliding driving mechanism 126 further includes a first elastic member 1263, which is sleeved on the connecting column 123, and the two ends of the first elastic member 1263 respectively abut the driving plate 1261 and the rotary sliding piston 121. Due to the presence of the first elastic member 1263, it can be ensured that the driving plate 1261 and the rotary sliding piston 121 are always supported by the first elastic member 1263, thereby preventing the driving plate 1261 and the ball joint connecting rod 1262 from shaking.

[0044] In some embodiments, in order to support the rotary sliding piston 121, the piston assembly 120 also includes a second elastic member 127, and the second elastic member 127 is sleeved on the connecting column 123. The two ends of the second elastic member 127 respectively abut 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 shaking of the rotary sliding piston 121 is avoided.

[0045] 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 drive mechanism 126 to perform rotational motion and vertical sliding in the first stage. After vertical sliding for a certain time and distance, 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 125 cannot continue to shorten due to extrusion, and the first piston 124 and the second piston 125 begin to slide vertically synchronously with the rotary sliding piston 121, thereby driving the piston rod 130 to move downward.

[0046] Please continue reading Figure 4 A V-shaped opening is provided on the side of the second piston 125 facing the rotary sliding piston, and the bottom of the rotary sliding piston 121 at least partially penetrates 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 penetrating into the V-shaped opening of the second piston increases.

[0047] 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, and the rotary sliding piston 121 is an inverted conical body, which can also be called an inverted truncated cone. The diameter of the upper end of the rotary sliding piston 121 is greater than the diameter of the lower end, and the sealing ring is sleeved on the inclined outer peripheral surface. In this way, 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, thereby improving the sealing performance of the sealing ring, thereby preventing oil leakage between the sealing ring and the cylinder wall.

[0048] Of course, in some embodiments, the longitudinal section of the rotary sliding piston 121 may also be rectangular. 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.

[0049] In some embodiments, the first piston 124 is cylindrical, including a cylinder bottom 1242, an inner cylinder 1243 and an outer cylinder 1244, the diameter of the inner cylinder 1243 is smaller than the diameter of the outer cylinder 1244, the third port 1241 passes through the cylinder bottom 1242, the rotary sliding drive mechanism 126 is arranged in the inner cylinder 1243, and the outer wall of the rotary sliding piston 121 at least partially abuts against the outer cylinder 1244.

[0050] Please continue reading Figure 4 The upper part of the outer wall of the rotating sliding piston 121 abuts against the inner wall of the outer cylinder 1244, the middle part of the outer wall of the rotating sliding piston 121 is sleeved with a sealing ring, abutting against the inner wall of the cylinder, and the lower part of the outer wall of the rotating sliding piston 121 penetrates into the V-shaped opening of the second piston 125.

[0051] In the related art, as the driving cylinder is used for a long time, the sealing ring is worn and the sealing ability is reduced. In order to ensure the normal operation of the driving cylinder, the driving cylinder has to be disassembled and the sealing ring replaced, which brings great manpower and material costs.

[0052] The present application provides a sealing adjustment mechanism on the driving oil cylinder, which can adjust the sealing performance of the sealing ring without disassembling the driving oil cylinder, thus saving maintenance time of the driving oil cylinder.

[0053] Please continue reading Figure 4 The driving oil cylinder 100 further includes a sealing 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 first adjustment hole 141 is formed in the 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 cover 112 and the first piston 124. In this configuration, the position of the rotary sliding piston 121 relative to the first piston 124 and the second piston 125 can be adjusted by the length of the first adjustment rod 142 extending downward from the first adjustment hole 141. After the sealing ring is worn due to long-term use, the length of the first adjusting rod 142 extending downward from the first adjusting hole 141 is increased, so that the rotary sliding piston 121 moves downward relative to the second piston 125. Since the diameter of the outer circumference of the rotary sliding piston 121 increases, the rotary sliding piston 121 will continue to squeeze the sealing ring in the horizontal direction, thereby improving the sealing performance of the sealing ring and compensating for the reduced sealing ability of the sealing ring due to wear, thereby preventing oil leakage between the sealing ring and the cylinder wall.

[0054] In some embodiments, the sealing adjustment mechanism 140 also 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 opened in the first end cover 112 and passes through the first end cover 112, the second adjustment rod 144 includes a third end 1441 and a fourth end 1442, the third end 1441 penetrates into the sealing cavity defined by the first end cover 112 and the first piston 124, and the fourth end 1442 extends out of the first end cover 112.

[0055] When the sealing performance of the sealing ring needs to be adjusted, the piston assembly 120 is driven upward so that the third end 1441 of the second adjusting rod 144 engages with the second end 1422 of the first adjusting rod 142, and the first end 1421 of the first adjusting rod 142 is adjusted by adjusting the third end 1441 of the second adjusting rod 144.

[0056] In some embodiments, in order to enable the piston assembly 120 to move upward, the main body 1131 is provided with a second port 115 perpendicular to the axial direction of the piston rod 130, and the extension portion 1132 is provided with a fourth port 116 parallel to the axial direction of the piston rod 130, and the second port 115 and the fourth port 116 are connected inside the second end cover 113. When hydraulic oil is injected from the second port 115, the hydraulic oil flows into the second end cover through the second port 115 in the horizontal direction, and then flows into the sealed space defined by the cylinder 111 through the fourth port 116 in the vertical direction, thereby providing hydraulic drive for the piston assembly 120, driving the piston assembly 120 to slide upward, that is, moving from the second end cover 113 toward the first end cover 112, thereby raising the piston rod 130, reducing the pressure of the push plate 131 on the sample until it is detached. In this way, after the piston assembly 120 moves upward to the point where the third end 1441 of the second adjustment rod 144 is engaged with the second end 1422 of the first adjustment rod 142, the staff can adjust the sealing performance of the sealing ring.

[0057] In some embodiments, the second end 1422 includes a cross recess, the third end 1441 includes a cross protrusion, and the fourth end 1442 includes a wrench, and the staff can rotate the wrench outside the first end cover 112 to make the second adjustment rod 144 drive the first adjustment rod 142 to rotate. In this way, when the sealing performance of the sealing ring needs to be adjusted, there is no need to open the first end cover 112, which simplifies the operation.

[0058] See also Figure 5 In some embodiments, the second end cover 113 includes a main body 1131 and an extension portion 1132. The second end cover 113 is in an inverted T shape, wherein the main body 1131 and the extension portion 1132 are provided with through holes for the piston rod 130 to slide, and the extension portion 1132 extends into the cylinder 111 and is sealed and connected to the inner wall of the cylinder 111.

[0059] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, 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, they should be considered to be within the scope of this specification.

[0060] The above-described embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, 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 attached claims.

Claims

1. A compression shear testing machine with adjustable sealing performance, comprising a driving cylinder (100), characterized in that: The driving cylinder (100) comprises: A housing assembly (110), the housing assembly comprising a cylinder (111) and a first end cover (112) and a second end cover (113) respectively connected to two ends of the cylinder (111); A piston assembly (120) comprises a rotary sliding piston (121) and a sealing ring (122), wherein the sealing ring (122) is sleeved on the outer circumference 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); When the piston assembly (120) slides from the first end cover (112) toward the second end cover (113) from a stationary state, the rotary sliding piston (121) performs horizontal rotary motion and vertical sliding motion, and the piston rod (130) performs vertical sliding motion under the sliding of the piston assembly (120).

2. The compression shear testing machine with adjustable sealing performance according to claim 1, characterized in that: The piston assembly (120) further comprises 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); the rotating sliding piston (121) is sleeved on the connecting column (123); along the sliding direction of the piston assembly (120), the rotating sliding piston (121) is located between the first piston (124) and the second piston (125).

3. The compression shear testing machine with adjustable sealing performance according to claim 2, characterized in that: The first piston (124) includes a third port (1241), and the piston assembly (120) further includes a rotary sliding drive mechanism (126). Under the hydraulic drive of the third port (1241), the rotary sliding drive mechanism (126) drives the rotary sliding piston (121) to perform horizontal rotational movement and vertical sliding movement.

4. The compression shear testing machine with adjustable sealing performance according to claim 3, characterized in that: The rotary sliding drive mechanism (126) comprises a drive plate (1261) and a ball joint connecting rod (1262); the drive plate (1261) is sleeved on the connecting column (123) and vertically slidably connected to the inside of the first piston (124); and the two ends of the ball joint connecting rod (1262) are respectively hinged to the drive plate (1261) and the rotary sliding piston (121).

5. According to the compression shear testing machine with adjustable sealing performance as claimed in claim 4, the rotary sliding driving 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 driving plate (1261) and the rotary sliding piston (121); and / or, The piston assembly (120) further comprises a second elastic member (127), wherein 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 rotating sliding piston (121) and the second piston (125).

6. The compression shear testing machine with adjustable sealing performance according to claim 2, characterized in that: The longitudinal section of the rotary sliding piston (121) is an inverted trapezoid; the second piston (125) is provided with a V-shaped opening on the side facing the rotary sliding piston (121); and the bottom of the rotary sliding piston (121) at least partially penetrates into the V-shaped opening of the second piston (125).

7. The compression shear testing machine with adjustable sealing performance according to claim 3, characterized in that: The first piston (124) is cylindrical and includes a cylinder bottom (1242), an inner cylinder (1243) and an outer cylinder (1244). The diameter of the inner cylinder (1243) is smaller than the diameter of the outer cylinder (1244). The third port (1241) passes through the cylinder bottom (1242). The rotary sliding drive mechanism (126) is arranged in the inner cylinder (1243). The outer wall of the rotary sliding piston (121) at least partially abuts against the outer cylinder (1244).

8. The compression shear testing machine with adjustable sealing performance according to claim 7, characterized in that: The driving cylinder (100) further comprises a sealing adjustment mechanism (140), wherein the sealing adjustment mechanism (140) comprises a first adjustment hole (141) and a first adjustment rod (142) movably connected to the first adjustment hole (141), wherein the first adjustment hole (141) is formed in the wall of the outer cylinder (1244), and the first adjustment rod (142) comprises a first end (1421) and a second end (1422), wherein the first end (1421) can extend out of the first adjustment hole (141) and abut against the rotating sliding piston (121), and the second end (1422) can penetrate into a sealing cavity defined by the first end cover (112) and the first piston (124).

9. The compression shear testing machine with adjustable sealing performance according to claim 8, characterized in that: The first end cover (112) includes a second adjustment hole (143) and a second adjustment rod (144) movably connected to the second adjustment hole (143); the second adjustment rod (144) includes a third end (1441) and a fourth end (1442); the third end (1441) extends into a sealed cavity between the first end cover (112) and the first piston (124); and the fourth end (1442) extends out of the first end cover (112).

10. The compression shear testing machine with adjustable sealing performance according to claim 1, characterized in that: Also includes: A driving oil cylinder fixing mechanism (200) comprises a frame (210) and a fixing platform (220), wherein the fixing platform (220) is fixedly connected to the frame (210), and the driving oil cylinder (100) is fixedly connected to the fixing platform (220); The shearing mechanism (300) comprises a base (310), a shearing pushing assembly (320) and a shearing locking assembly (330).

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