A silicone material testing machine

Abstract

This application relates to the field of silicone performance testing technology and discloses a silicone material testing machine to solve the problem of premature breakage of sealing rings, which affects their tensile performance test data. The invention utilizes a mandrel, gear ring, and rack configuration. During the opposite movement of the two mandrels, the meshing transmission of the gear ring and rack achieves the same-direction rotation of the two mandrels, causing the sealing ring stretched by the mandrels to rotate synchronously. This action continuously changes the stress point of the sealing ring and avoids prolonged friction at a single location, reducing the probability of micro-cracks in the sealing ring and thus minimizing the impact on the tensile performance test data. During the same-direction rotation of the mandrels, the protrusions intermittently contact the retaining teeth, causing the retaining teeth to periodically push outward radially, thereby driving the silicone sleeve to periodically expand radially. This prevents the sealing ring from slipping and generates relative friction, further reducing the probability of micro-cracks in the sealing ring.

Description

Technical Field

[0001] This application relates to the field of silicone performance testing technology, and in particular to a silicone material testing machine. Background Technology

[0002] Silicone material testing machines are precision testing equipment specifically used to test the mechanical properties of highly elastic and large-deformation materials such as silicone and rubber. Some of these testing machines collect stress data in real time through a controlled tensile process and ultimately calculate the key mechanical properties of the material.

[0003] Some existing silicone material testing machines are used to test the tensile properties of silicone seals. In use, the seal is fitted onto two horizontal mandrels. Then, an electric cylinder drives the two mandrels to move in opposite directions, gradually stretching the seal until it breaks. The electric cylinder is equipped with a tension sensor, which senses the force when the seal breaks, thereby obtaining the tensile performance data of the seal.

[0004] However, in the above process, since the contact position between the sealing ring and the mandrel is fixed, the stress point of the sealing ring is fixed. When the sealing ring is subjected to tensile deformation, it will rub against the mandrel, which will cause friction at the contact position between the sealing ring and the mandrel and generate micro-cracks, causing the sealing ring to break prematurely and affecting the test data of the tensile performance of the sealing ring. Summary of the Invention

[0005] This application proposes a silicone material testing machine, which has the advantages of changing the stress point of the sealing ring and reducing the probability of micro-cracks in the sealing ring, so as to solve the problem of premature breakage of the sealing ring and affecting its tensile performance test data.

[0006] To achieve the above objectives, this application adopts the following technical solution: a silicone material testing machine, comprising: a base, on both sides of the upper side of the base, an mounting platform is fixedly installed, an electric cylinder is fixedly installed at the center of the mounting platform, the telescopic rods of the two electric cylinders are arranged opposite to each other, a tension sensor is fixedly installed at the end of the telescopic rod of the electric cylinder, two mandrels are placed above the base and in the middle of the two mounting platforms, a rotating ring is fixedly installed at the middle of the outer circumference of the mandrel, the rotating ring is a bearing, the inner ring of the rotating ring is fixedly sleeved with the middle of the outer circumference of the mandrel, the outer ring of the rotating ring is fixedly connected to the tension sensor in the corresponding direction, a toothed ring is fixedly sleeved on the lower side of the outer circumference of the mandrel, racks are fixedly installed on the opposite sides of the two mounting platforms, the racks are centrally symmetrical along the center line of the base, the racks are meshed with the toothed rings in the corresponding direction, and a sealing ring is sleeved on the upper side of the outer circumference of the two mandrels.

[0007] Furthermore, silicone sleeves are fixedly fitted on the upper side of the outer circumferential surface of both mandrels. The outer circumferential surface of the silicone sleeve has an inverted conical structure, and the sealing ring is fitted in the middle of the silicone sleeve.

[0008] Furthermore, the outer circumferential surface of the mandrel is provided with equidistant locking teeth, which are Y-shaped structures. The outer forked end of the Y-shaped structure forms a fixed locking connection with the inside of the silicone sleeve.

[0009] Furthermore, the mandrel has a hollow structure, and the inner straight end of the Y-shaped locking teeth slides into the inner cavity of the mandrel. A contact rod is placed at the center of the inner cavity of the mandrel, and a slider is fixedly installed at the lower end of the contact rod. The slider has a square structure, and a groove is opened on the upper side of the base corresponding to the position of the slider. The slider and the groove form a sliding engagement. Protrusions are fixedly installed at equal intervals on the upper side of the outer circumference of the contact rod. The protrusions have an arc-shaped structure, and the connection between adjacent protrusions is set with a smooth transition of rounded corners. In the initial state, the inner straight ends of all locking teeth contact the trough position between adjacent protrusions.

[0010] Furthermore, the locking teeth are made of bearing steel, and the surface of the locking teeth is polished after quenching and low-temperature tempering. The contact rod and the protrusion are made of stainless steel, and the surface of the contact rod and the protrusion is quenched, cryogenically treated, and low-temperature tempered. The silicone sleeve is made of methyl vinyl silicone rubber. The toothed ring and the toothed rack are both made of alloy steel, and the surface of the toothed ring and the toothed rack is tempered and high-frequency quenched. The rotating ring is made of hard aluminum alloy, and the surface of the rotating ring is hard anodized.

[0011] Furthermore, a straight plate is fixedly installed on the inner side of the locking tooth. The straight plate is symmetrically arranged with the inner side of the locking tooth as the center. The straight plate is located in the inner cavity of the mandrel, and there is a gap between the straight plate and the inner wall of the mandrel.

[0012] Furthermore, the straight plate is an elastic plate, and through holes are equidistantly opened on the upper circumference of the inside of the mandrel. The through holes are located on one side of the retaining teeth. The inner end of the through holes is connected to the inner cavity of the mandrel, and the outer end of the through holes is opened on the outer circumferential surface of the mandrel, corresponding to the middle position of the silicone sleeve.

[0013] Furthermore, the mandrel is made of aluminum alloy and its surface is subjected to hard anodizing treatment. The straight plate is made of stainless steel and is subjected to cold rolling and then stress-relief annealing.

[0014] This application has the following beneficial effects: This application provides a silicone material testing machine. Through the arrangement of a mandrel, a toothed ring, and a rack, the two mandrels move in opposite directions. The meshing transmission of the toothed ring and rack enables the two mandrels to rotate in the same direction, causing the sealing ring stretched by the mandrel to rotate synchronously. This action continuously changes the stress point of the sealing ring and avoids prolonged friction on a single position, thus reducing the probability of micro-cracks in the sealing ring and minimizing the impact on the tensile performance test data of the sealing ring.

[0015] By using the silicone sleeve, retaining teeth, and protrusions, during the rotation of the aforementioned mandrel in the same direction, the protrusions intermittently contact the retaining teeth, causing the retaining teeth to periodically push out radially, which in turn drives the silicone sleeve to periodically expand radially. This allows the sealing ring to be smoothly rotated by the mandrel, preventing the sealing ring from slipping and generating relative friction. This reduces the probability of the sealing ring developing microcracks and minimizes the impact on the tensile performance test data of the sealing ring.

[0016] By using the toothed clamp and the straight plate, and because the mandrel is hollow, the straight plate will fan back and forth during the periodic radial outward ejection of the toothed clamp. This disturbs the gas flow inside the mandrel, causing the temperature of the silicone sleeve and the mandrel to drop. This eliminates the frictional heat of the sealing ring, preventing the silicone sealing ring from softening and causing low tensile strength, which would affect the accuracy of the test data. Attached Figure Description

[0017] The accompanying drawings, which form part of this specification, illustrate embodiments disclosed in this application and, together with the specification, serve to explain the principles disclosed in this application.

[0018] This application can be more clearly understood with reference to the accompanying drawings and the following detailed description, wherein: Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the mounting structure on the outer circumferential surface of the mandrel of the present invention; Figure 3 This is a schematic diagram of the internal structure of the mandrel of the present invention; Figure 4 This is a schematic diagram showing the relative positions of the through hole and the retaining tooth in this invention; Figure 5 This is a schematic diagram of the contact rod of the present invention; Figure 6 This is a schematic diagram showing the rotation direction of the gear in this invention.

[0019] In the diagram: 1. Base; 2. Mounting platform; 3. Electric cylinder; 4. Tension sensor; 5. Spindle; 6. Rotary ring; 7. Gear ring; 8. Gear rack; 9. Sealing ring; 10. Silicone sleeve; 11. Clamping tooth; 12. Contact rod; 13. Slider; 14. Slide groove; 15. Protrusion; 16. Straight plate; 17. Through hole. Detailed Implementation

[0020] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0021] Example 1: Please refer to Figures 1-6 A silicone material testing machine includes a base 1. Mounting platforms 2 are bolted to both sides of the upper side of the base 1. An electric cylinder 3 is bolted to the center of the mounting platform 2. The telescopic rods of the electric cylinders 3 are arranged opposite each other. A tension sensor 4 is fixedly mounted at the end of the telescopic rod of the electric cylinder 3. Two spindles 5 are placed above the base 1, between the two mounting platforms 2. A rotating ring 6, a bearing, is fixedly mounted at the center of the outer circumference of the spindle 5. The inner ring of the rotating ring 6 is fixedly sleeved with the center of the outer circumference of the spindle 5. The outer ring of the rotating ring 6 is fixedly connected to the tension sensor 4 in the corresponding direction. A toothed ring 7 is fixedly sleeved on the lower side of the outer circumference of the spindle 5. Racks 8 are fixedly mounted on opposite sides of the mounting platforms 2. The racks 8 are centrally symmetrical along the center line of the base 1. The racks 8 mesh with the toothed ring 7 in the corresponding direction. A sealing ring 9 is sleeved on the upper side of the outer circumference of the two spindles 5.

[0022] In use, firstly, the sealing ring 9 is fitted onto the two mandrels 5 together. Then, the electric cylinders 3 on both sides are operated to retract the telescopic rod. The tension sensor 4 drives the two mandrels 5 to move in opposite directions, thereby stretching the sealing ring 9. The tension sensor 4 senses the magnitude of the tension on the sealing ring 9, thereby realizing the tension detection of the sealing ring 9. During the movement of the mandrel 5 in opposite directions, the mandrel 5 will drive the toothed ring 7 to move synchronously, so that the toothed ring 7 gradually meshes with the rack 8, thereby driving the mandrel 5 to rotate in the rotating ring 6. Since the racks 8 on both sides are centrally symmetrical, the mandrels 5 on both sides rotate in the same direction, thereby driving the stretched sealing ring 9 to rotate synchronously, so that the stress point of the sealing ring 9 changes continuously, and avoids the sealing ring 9 being rubbed at a single position for a long time, thus reducing the probability of the sealing ring 9 developing microcracks, thereby reducing the impact on the tensile performance test data of the sealing ring 9. Meanwhile, as the contact position between the sealing ring 9 and the spindle 5 changes continuously, frictional heat is avoided from accumulating at the same position of the sealing ring 9 (long-term accumulation of frictional heat will accelerate the aging of the sealing ring 9, causing the sealing ring 9 to break prematurely and affecting the tensile performance test results of the sealing ring 9), making the temperature of the sealing ring 9 more uniform and the test results more stable. Subsequently, when the sealing ring 9 is broken, the spindle 5 stops applying force to the tension sensor 4, causing the tension sensor 4 to record the current tension data and send a signal to the electric cylinder 3, causing the electric cylinder 3 to move back to its original position.

[0023] Please see Figures 1-6 Silicone sleeves 10 are fixedly fitted on the upper side of the outer circumferential surface of the two mandrels 5. The outer circumferential surface of the silicone sleeve 10 is an inverted conical structure. The sealing ring 9 is fitted in the middle of the silicone sleeve 10. The outer circumferential surface of the mandrel 5 is provided with equidistant locking teeth 11. The locking teeth 11 are Y-shaped structures. The outer bifurcated end of the Y-shaped structure forms a fixed locking connection with the inside of the silicone sleeve 10.

[0024] By setting the inverted conical surface of the silicone sleeve 10, the stretched sealing ring 9 is always kept in the middle position of the silicone sleeve 10, avoiding axial displacement of the sealing ring 9 on the surface of the spindle 5 (when the sealing ring 9 is stretched, the cross section of the sealing ring 9 contracts and moves towards the middle, just hitting the conical surface. The greater the stretching amount, the more severe the cross section contraction of the sealing ring 9, and the greater the clamping force on the conical surface). Since the silicone sleeve 10 and the sealing ring 9 are made of the same material, the contact friction coefficient of silicone-silicone (0.8-1.2) is much higher than that of metal-silicone (0.3-0.6), which solves the slippage problem of the sealing ring 9 from the root. The Y-shaped retaining teeth 11 prevent relative movement between the spindle 5 and the silicone sleeve 10, thereby reducing wear on the silicone sleeve 10.

[0025] Please see Figures 1-6 The mandrel 5 has a hollow structure. The inner straight end of the Y-shaped tooth 11 slides into the inner cavity of the mandrel 5. A contact rod 12 is placed at the center of the inner cavity of the mandrel 5. A slider 13 is fixedly installed at the lower end of the contact rod 12. The slider 13 has a square structure. A groove 14 is opened on the upper side of the base 1 corresponding to the position of the slider 13. The slider 13 and the groove 14 form a sliding engagement. Protrusions 15 are fixedly installed at equal intervals on the upper side of the outer circumference of the contact rod 12. The protrusions 15 have an arc structure. The connection between adjacent protrusions 15 is set with a smooth transition with rounded corners. In the initial state, the inner straight ends of all the teeth 11 are in contact with the trough position between adjacent protrusions 15.

[0026] During the opposite movement of the mandrel 5, the mandrel 5 drives the contact rod 12 to move via the locking teeth 11, causing the slider 13 to slide within the groove 14. Simultaneously, during the rotation of the mandrel 5, the relative rotation of the mandrel 5 and the contact rod 12 is achieved through the engagement of the slider 13 with the groove 14 (the contact rod 12 does not rotate). This causes the mandrel 5 to drive the inner end of the locking teeth 11 to intermittently contact the protrusion 15, thereby periodically pushing the locking teeth 11 radially outward by the protrusion 15. This results in the locking teeth 11 driving the silicone sleeve 10 to periodically expand radially (through the silicone sleeve). The limiting effect of the 10 locking teeth 11 ensures that when the mandrel 5 moves the contact rod 12 via the locking teeth 11, the contact rod 12 moves synchronously with the mandrel 5. This prevents the contact rod 12 from being affected by the friction between the slider 13 and the groove 14, and prevents the contact rod 12 from being eccentric relative to the mandrel 5. At the same time, since in the initial state, the inner straight ends of all the locking teeth 11 are in contact with the trough position between adjacent protrusions 15, as the contact rod 12 and the mandrel 5 rotate relative to each other, the inner straight ends of all the locking teeth 11 move from the trough position between adjacent protrusions 15 to the trough position of the protrusion 15. At the peak position, all the retaining teeth 11 are simultaneously radially pushed out by the protrusions 15. Then, as the contact rod 12 and the spindle 5 continue to rotate relative to each other, the elastic action of the silicone sleeve 10 causes the inner straight ends of all the retaining teeth 11 to move from the peak position of the protrusions 15 to the trough position between adjacent protrusions 15, causing all the retaining teeth 11 to simultaneously retract radially. This allows the sealing ring 9 to be smoothly driven to rotate by the spindle 5, preventing the sealing ring 9 from slipping and making it less likely for the sealing ring 9 and the silicone sleeve 10 to rub against each other, thereby reducing the probability of the sealing ring 9 developing microcracks. This reduces the impact on the tensile performance test data of the sealing ring 9 (the original silicone sleeve 10 statically holds the sealing ring 9: it only relies on the cross-sectional contraction of the sealing ring 9 during tension to generate static friction. If the silicone surface is extremely smooth and the tension rate changes abruptly, local micro-slippage will still occur. However, the above-mentioned periodic radial clamping is a dynamic multi-point clamping: every time the spindle 5 rotates, the silicone sleeve 10 expands radially multiple times, alternately applying pressure to the sealing ring 9. Local micro-slippage is suppressed in time. Even if the sealing ring 9 continues to deform and the cross-section continues to shrink under high elongation, the clamping force can dynamically compensate. Unlike overall locking: periodic expansion will not continuously compress the sealing ring 9 under high pressure, avoiding stress concentration and premature tearing in the contact area; The sealing ring 9 rotates synchronously with the spindle 5. The inner circumferential position of the sealing ring 9 is radially pressed in turn, so that the sealing ring 9 will not be fixed in a single point of pressure for a long time, thus eliminating local indentation and local hardening. The tensile force is evenly transmitted along the circumference of the sealing ring 9, and the fracture location is randomly distributed. This can truly reflect the overall material strength of the sealing ring 9, rather than the local strength of the clamping point. It simulates the stress state of "intermittent pressure and continuous rotation" under actual rotary sealing conditions, and the test data is more in line with the field use conditions. The radial force is intermittent and pulsed, which, compared to a clamp that holds the silicone in place throughout the entire process, will not cause localized extrusion and whitening of the silicone or the formation of hidden microcracks. Meanwhile, during the periodic radial pushing of the silicone sleeve 10 by the aforementioned tooth 11, since the opposite side of the silicone sleeve 10 does not contact the sealing ring 9, the periodic expansion and contraction of the silicone sleeve 10 will cause slight deformation on the surface of the silicone sleeve 10. This will cause the silicone sleeve 10 away from the sealing ring 9 to automatically shake off the surface residue (fine particles, dust particles, etc. generated by silicone friction), eliminating the influence of surface impurities on friction (particles embedded in the contact interface between the silicone sleeve 10 and the sealing ring 9 are equivalent to adding micro abrasives between the contact surfaces, causing the friction coefficient between the two to increase sharply, resulting in a larger deviation in the tensile strength and elongation data of the sealing ring 9). This will prevent the accumulation of frictional heat, accelerate the breakage of the sealing ring 9, and extend the service life of the silicone sleeve 10. In addition, during the periodic actuation of the silicone sleeve 10, a gap will be created between the actuated position of the silicone sleeve 10 and the spindle 5, thereby generating negative pressure and drawing in outside air. Afterwards, when the actuated position of the silicone sleeve 10 returns to its original position, the air is forced out. This action further cools the silicone sleeve 10 and the sealing ring 9, reducing the frictional heat between the two and preventing the sealing ring 9 from breaking prematurely. (The frictional heat between the sealing ring 9 and the silicone sleeve 10 is mainly concentrated at the position corresponding to the periodically pressed teeth 11 (where the contact pressure is the greatest and the relative friction is the most intense). The aforementioned local gap happens to appear in the high-temperature hot spot area, and the airflow directly washes the inner wall of the silicone sleeve 10 at this position, achieving point-to-point precise cooling.)

[0027] Please see Figures 1-6 The clasp 11 is made of GCr15 bearing steel. The surface of the clasp 11 is quenched and tempered at low temperature and then polished. The contact rod 12 and the protrusion 15 are made of 9Cr18Mo stainless steel. The surface of the contact rod 12 and the protrusion 15 is quenched, cryogenically treated and tempered at low temperature. The silicone sleeve 10 is made of methyl vinyl silicone rubber. The toothed ring 7 and the toothed rack 8 are both made of 40Cr alloy steel. The surface of the toothed ring 7 and the toothed rack 8 is tempered and quenched at high frequency. The rotating ring 6 is made of LY12 hard aluminum alloy. The surface of the rotating ring 6 is hard anodized.

[0028] GCr15 bearing steel has extremely high wear resistance and hardness. After quenching, the hardness reaches HRC60-65. It has minimal wear during long-term reciprocating motion, excellent dimensional stability, and deformation ≤0.005mm after heat treatment. It ensures consistent protrusion of the 11 teeth, uniform local gap size, high compressive strength, and can withstand frequent impact loads without deformation or breakage. 9Cr18Mo stainless steel has extremely high wear resistance and corrosion resistance. After quenching, its hardness reaches HRC58-62. When paired with the 11-tooth chuck, the friction coefficient is stable (0.1-0.15), with no adhesive wear. It has good rust prevention performance and will not rust even in high humidity environments, ensuring smooth movement. The friction coefficient of methyl vinyl silicone rubber is matched with that of the tested silicone sealing ring 9 (0.8-1.2), which solves the slippage problem at the root. It has excellent elasticity, with an elongation of more than 500%, which can realize large-stroke periodic expansion and contraction. It has high tear strength, good fatigue resistance, and can withstand more than 3,000 cycles of repeated deformation. It has good heat resistance and its performance is stable in the temperature range of -60℃ to +200℃. 40Cr alloy steel has good comprehensive mechanical properties. After quenching, its hardness reaches HRC50-55. It has good wear resistance, strong impact resistance, and can withstand frequent meshing impacts without breaking teeth. LY12 hard aluminum alloy has good rigidity, high strength, can withstand tensile loads without deformation, low density, small moment of inertia, and smooth movement.

[0029] Example 2: Please refer to Figures 1-6 A straight plate 16 is fixedly installed on the inner side of the locking tooth 11. The straight plate 16 is symmetrically arranged with the inner side of the locking tooth 11 as the center. The straight plate 16 is located in the inner cavity of the spindle 5, and there is a gap between the straight plate 16 and the inner wall of the spindle 5.

[0030] During the process of the protrusion 15 intermittently pushing the retaining tooth 11 outward, the retaining tooth 11 will drive the straight plate 16 to reciprocate radially within the spindle 5, thereby disturbing the gas flow inside the spindle 5, causing the temperature of the silicone sleeve 10 and the spindle 5 to decrease, thereby eliminating the frictional heat of the sealing ring 9, preventing the silicone sealing ring 9 from softening, resulting in low tensile strength and affecting the accuracy of the test data.

[0031] Please see Figures 1-6 The straight plate 16 is an elastic plate. The upper side of the spindle 5 is provided with through holes 17 at equal intervals around the circumference. The through holes 17 are located on one side of the tooth 11. The inner end of the through holes 17 is connected to the inner cavity of the spindle 5. The outer end of the through holes 17 is opened on the outer circumferential surface of the spindle 5 and corresponds to the middle position of the silicone sleeve 10.

[0032] During the process of the protrusion 15 intermittently pushing the retaining tooth 11 outward, when the protrusion 15 initially pushes the retaining tooth 11 outward, it will drive the straight plate 16 to move outward radially and make the side of the straight plate 16 away from the retaining tooth 11 abut against the inner wall of the spindle 5. Then, as the protrusion 15 pushes the retaining tooth 11 further, the straight plate 16 will deform. Through this action, the elastic straight plate 16 provides an auxiliary resetting force independent of the silicone sleeve 10. Even if the elastic force of the silicone sleeve 10 decreases, the straight plate 16 can still help reset the retaining tooth 11. Meanwhile, since the inner end of the retaining tooth 11 is slidably connected to the spindle 5, there is a small gap between the inner wall of the spindle 5 and the side of the inner end of the retaining tooth 11. This causes the retaining tooth 11 to be slightly deflected during the rotation of the sealing ring 9 by the silicone sleeve 10. This results in an uneven distribution of the clamping force applied by the retaining tooth 11 to the sealing ring 9 by the silicone sleeve 10. The deformed straight plate 16 contacts the inner wall of the spindle 5, thereby providing circumferential limiting for the retaining tooth 11 and preventing it from tilting during sliding. This ensures that the top of the retaining tooth 11 is always perpendicular to the inner surface of the silicone sleeve 10, so that the clamping force applied by the silicone sleeve 10 to the sealing ring 9 is evenly distributed. In addition, during the process of the straight plate 16 contacting the inner wall of the spindle 5 and deforming, the deformed straight plate 16 will squeeze the air between the straight plate 16 and the inner wall of the spindle 5, so that the air is discharged from the upper and lower sides of the space between the straight plate 16 and the spindle 5. Through the setting of the through hole 17, since the silicone sleeve 10 is radially lifted at this time, the part of the silicone sleeve 10 that is lifted away from the spindle 5 and generates negative pressure, while the straight plate 16 squeezes the air, making it easier for the air to flow along the through hole 17 to the part of the silicone sleeve 10 that is lifted, thereby accelerating the air flow and improving the cooling effect on the silicone sleeve 10 and the sealing ring 9.

[0033] Please see Figures 1-6 The mandrel 5 is made of 6061-T6 aluminum alloy and its surface is hard anodized. The straight plate 16 is made of 301 stainless steel (EH grade) and is cold rolled and then stress-relief annealed.

[0034] The thermal conductivity of 6061-T6 aluminum alloy is as high as 180W / (m・K), which is 5 times that of stainless steel. It can quickly conduct frictional heat to the air. It has low density (2.7g / cm³), small moment of inertia, and the breaking of the sealing ring 9 will not generate excessive inertial impact. It has sufficient rigidity and tensile strength of 310MPa, which meets the load requirements of tensile test. 301 stainless steel has extremely high elastic limit and fatigue strength. Its elastic limit can reach 1200MPa, and it can withstand more than 1 million repeated deformations without fatigue fracture. Its elastic modulus temperature coefficient is extremely low, and its elasticity remains almost unchanged in the temperature range of -10℃ to +50℃, achieving temperature self-compensation of clamping force. It also has good corrosion resistance.

Claims

1. A silicone material testing machine, comprising: A base (1) is provided, and mounting platforms (2) are fixedly installed on both sides of the upper side of the base (1). An electric cylinder (3) is fixedly installed at the center of the mounting platform (2). The telescopic rods of the electric cylinders (3) on both sides are arranged opposite to each other. A tension sensor (4) is fixedly installed at the end of the telescopic rod of the electric cylinder (3). Two spindles (5) are placed above the base (1) and in the middle of the mounting platforms (2) on both sides. The characteristic is that a rotating ring (6) is fixedly installed at the middle of the outer circumference of the spindle (5). The rotating ring (6) is a bearing. The inner ring of the rotating ring (6) is fixedly sleeved at the middle position of the outer circumference of the spindle (5). The outer ring of the rotating ring (6) is fixedly connected to the tension sensor (4) in the corresponding direction. A toothed ring (7) is fixedly sleeved on the lower side of the outer circumference of the spindle (5). A rack (8) is fixedly installed on the opposite sides of the mounting platforms (2) on both sides. The racks (8) on both sides are centrally symmetrical along the center line of the base (1). The racks (8) and the toothed ring (7) in the corresponding direction form a meshing connection. A sealing ring (9) is sleeved on the upper side of the outer circumference of the spindle (5) on both sides.

2. The silicone material testing machine according to claim 1, characterized in that, Silicone sleeves (10) are fixedly fitted on the upper side of the outer circumferential surface of the two mandrels (5). The outer circumferential surface of the silicone sleeve (10) is an inverted conical surface structure, and the sealing ring (9) is fitted in the middle position of the silicone sleeve (10).

3. A silicone material testing machine according to claim 2, characterized in that, The mandrel (5) has equidistant locking teeth (11) on its outer circumference. The locking teeth (11) are Y-shaped, and the outer bifurcated end of the Y-shaped structure forms a fixed locking connection with the inside of the silicone sleeve (10).

4. A silicone material testing machine according to claim 3, characterized in that, The mandrel (5) is a hollow structure. The inner straight end of the Y-shaped tooth (11) is slidably inserted into the inner cavity of the mandrel (5). A contact rod (12) is placed at the center of the inner cavity of the mandrel (5). A slider (13) is fixedly installed at the lower end of the contact rod (12). The slider (13) is a square structure. A groove (14) is opened on the upper side of the base (1) corresponding to the position of the slider (13). The slider (13) and the groove (14) form a sliding engagement. Protrusions (15) are fixedly installed at equal intervals on the upper side of the outer circumference of the contact rod (12). The protrusions (15) are arc-shaped structures. The connection between adjacent protrusions (15) is set with a smooth transition of rounded corners. In the initial state, the inner straight ends of all the teeth (11) are in contact with the trough position between adjacent protrusions (15).

5. A silicone material testing machine according to claim 4, characterized in that, The tooth (11) is made of bearing steel. The surface of the tooth (11) is polished after quenching and low-temperature tempering. The contact rod (12) and the protrusion (15) are made of stainless steel. The surface of the contact rod (12) and the protrusion (15) is quenched, cryogenically treated and low-temperature tempered. The silicone sleeve (10) is made of methyl vinyl silicone rubber. The toothed ring (7) and the toothed rack (8) are both made of alloy steel. The surface of the toothed ring (7) and the toothed rack (8) is tempered and high-frequency quenched. The rotating ring (6) is made of hard aluminum alloy. The surface of the rotating ring (6) is hard anodized.

6. A silicone material testing machine according to claim 4, characterized in that, A straight plate (16) is fixedly installed on the inner side of the tooth (11). The straight plate (16) is symmetrically arranged with the inner side of the tooth (11) as the center. The straight plate (16) is located in the inner cavity of the mandrel (5). There is a gap between the straight plate (16) and the inner wall of the mandrel (5).

7. A silicone material testing machine according to claim 6, characterized in that, The straight plate (16) is an elastic plate. The upper side of the mandrel (5) is provided with through holes (17) at equal intervals. The through holes (17) are located on one side of the tooth (11). The inner end of the through holes (17) is connected to the inner cavity of the mandrel (5). The outer end of the through holes (17) is opened on the outer circumferential surface of the mandrel (5) and corresponds to the middle position of the silicone sleeve (10).

8. A silicone material testing machine according to claim 6, characterized in that, The mandrel (5) is made of aluminum alloy and the surface of the mandrel (5) is subjected to hard anodizing treatment. The straight plate (16) is made of stainless steel and is subjected to cold rolling treatment and then stress-relief annealing.

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