Tensile strength testing device for rubber sealing ring

Abstract

The utility model relates to the technical field of sealing ring performance detection devices, in particular to a tensile strength testing device for a rubber sealing ring, which comprises a big-end-up inverted cone-shaped rod and a straight rod fixedly connected below the inverted cone-shaped rod, a plurality of flexible ropes are fixed above the inverted cone-shaped rod in the circumferential direction of the inverted cone-shaped rod, and a mounting hole is formed in the middle of the upper part of the inverted cone-shaped rod. An air cylinder is arranged in the mounting hole, the telescopic end of the air cylinder faces upwards and is fixedly connected with a movable plate, a plurality of lock holes are formed in the edge of the movable plate in the circumferential direction of the movable plate, and a lock catch is fixed to the end of the flexible rope; the sealing ring upwards sleeves the inverted conical rod from the straight rod, and the flexible rope penetrates through the space between the sealing ring and the inverted conical rod and is bent upwards until the lock catch at the end part of the flexible rope is buckled and connected with the lock hole; according to the utility model, the condition of circumferential integral stretching of the sealing ring under the assembly condition is simulated instead of the stretching test condition of two-point stress, the tensile strength value of the sealing ring under the actual assembly condition is obtained, and the test structure is more accurate.

Description

Technical Field

[0001] The utility model relates to the technical field of sealing ring performance detection devices, and particularly relates to a tensile strength testing device for rubber sealing rings. Background Art

[0002] Rubber sealing rings are widely used in various mechanical devices to prevent fluid leakage, and their performance directly affects the reliability and service life of the equipment. Tensile strength is one of the important indicators to measure the performance of rubber sealing rings, which is directly related to the deformation ability and service life of the sealing ring under external force.

[0003] Traditional testing methods for the tensile strength of rubber sealing rings mostly use a simple tensile testing machine for two-point tensile testing, that is, applying tensile force at both ends of the sealing ring and observing its fracture situation to evaluate its tensile strength. Although this method is simple and easy to implement, the two-point tensile testing cannot simulate the circumferential overall tensile stress received by the sealing ring under actual working conditions, and local stress concentration will occur between the two points of the sealing ring, resulting in the test results not fully reflecting the overall performance of the sealing ring, and having certain limitations for analyzing its failure mode. Content of the Utility Model

[0004] I. Technical Problems to be Solved

[0005] The purpose of the utility model is to provide a tensile strength testing device for rubber sealing rings

[0006] II. Technical Solutions

[0007] The utility model is realized through the following technical solutions:

[0008] The utility model provides a tensile strength testing device for rubber sealing rings, which includes an inverted conical rod with a large upper part and a small lower part, and a straight rod fixedly connected below the inverted conical rod. A plurality of flexible ropes are fixedly arranged around the circumference of the upper part of the inverted conical rod. An installation hole is opened in the middle of the upper part of the inverted conical rod, and a cylinder is arranged in the installation hole. The telescopic end of the cylinder faces upwards and is fixedly connected with a moving plate. A plurality of locking holes are opened around the circumference of the edge of the moving plate. Locking buckles are fixed at the ends of the flexible ropes; the sealing ring is sleeved upwards from the straight rod onto the inverted conical rod, and the flexible ropes pass through the space between the sealing ring and the inverted conical rod and then bend upwards until the locking buckles at their ends are buckled and connected with the locking holes.

[0009] Furthermore, it also includes a base, and a threaded rod is fixedly connected to the base. A threaded hole for threaded connection with the threaded rod is opened on the lower end face of the straight rod.

[0010] Furthermore, a plurality of embedding grooves are opened around the circumference of the side wall of the inverted conical rod, and the flexible ropes are embedded in the embedding grooves and bypass the lower part of the sealing ring.

[0011] Furthermore, the surface of the inverted cone rod is provided with marking scales, and the reading of the marking scales indicates the circumference of the side wall of the inverted cone rod at the current height position.

[0012] Furthermore, there are at least four flexible ropes, which are evenly distributed around the inverted tapered rod.

[0013] 3. Beneficial Effects

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] The utility model extends the cylinder to pull the sealing ring as a whole, so that the sealing ring is gradually tensioned and sleeved on the inverted tapered rod until the tensioning force of the sealing ring fails or breaks. The circumference of the current sealing ring can be represented by reading the identification scale, and then the elongation of the sealing ring can be obtained, and the situation of the overall circumferential stretching of the sealing ring in the assembly condition is simulated, rather than the tensile test condition of two-point force, so as to obtain the tensile strength value of the sealing ring close to the actual assembly condition, so that the test structure is more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0017] 1. Inverted tapered rod; 11. Mounting hole; 12. Groove; 13. Marking scale; 2. Straight rod; 21. Threaded hole; 3. Flexible rope; 4. Cylinder; 5. Moving plate; 51. Lock hole; 6. Lock buckle; 7. Base; 8. Threaded rod; 9. Sealing ring. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0019] A rubber sealing ring tensile strength testing device comprises an inverted conical rod 1 and a straight rod 2 fixedly connected to the bottom of the inverted conical rod 1, wherein the inverted conical rod 1 is in the shape of a cone with a larger top and a smaller bottom, and a plurality of flexible ropes 3 are fixed around the circumference of the inverted conical rod 1 above the inverted conical rod 1, wherein the flexible ropes 3 are at least four and are evenly distributed around the circumference of the inverted conical rod 1; a mounting hole 11 is provided in the middle of the top of the inverted conical rod 1, and a cylinder 4 is provided in the mounting hole 11, wherein the telescopic end of the cylinder 4 faces upward and is fixedly connected to a moving plate 5, and a plurality of locking holes 51 are provided at the edge of the moving plate 5 around the circumference thereof, and a locking buckle 6 is fixed to the end of the flexible rope 3, and the locking buckle 6 and the locking hole 51 are detachably buckled and connected.

[0020] It further includes a base 7, on which a threaded rod 8 is fixedly connected. A threaded hole 21 for threaded connection with the threaded rod 8 is provided on the lower end face of the straight rod 2. A sealing ring 9 is sleeved on the inverted conical rod 1 to detect its tensile strength. The straight rod 2 is set to be detachable, which is convenient for sleeving the sealing ring 9. And during the detection, the inverted conical rod 1 can be stabilized to make the detection result accurate.

[0021] Wherein, a marking scale 13 is provided on the surface of the inverted conical rod 1, and the reading of the marking scale 13 represents the circumferential length of the side wall surface of the inverted conical rod 1 at the current height position.

[0022] During use, the air cylinder 4 retracts to the shortest, the lock 6 is disassembled from the lock hole 51, and the flexible rope 3 hangs down; the straight rod 2 is rotated to separate the straight rod 2 from the base 7; the sealing ring 9 is sleeved outside the straight rod 2 and all the flexible ropes 3, and the sealing ring 9 is moved upward until the sealing ring 9 is sleeved on the inverted conical rod 1. At this time, the flexible rope 3 passes through the space between the sealing ring 9 and the inverted conical rod 1 and reaches below the sealing ring 9. The flexible rope 3 is bent upward until the lock 6 at the end of the flexible rope 3 is close to the lock hole 51; the straight rod 2 is connected to the base 7, the lock 6 and the lock hole 51 are snap-connected, the air cylinder 4 is started to make it extend, the air cylinder 4 drives the moving plate 5 to move upward, the moving plate 5 drives the flexible rope 3 to be tensioned, and the flexible rope 3 pulls the sealing ring 9 upward, so that the sealing ring 9 is gradually tensioned and sleeved on the inverted conical rod 1. The air cylinder 4 continues to extend until the tension of the sealing ring 9 fails or breaks. By reading the marking scale 13, the circumference of the current sealing ring 9 can be characterized, and then the elongation of the sealing ring 9 can be obtained. Simulating the situation of the circumferential overall stretching of the sealing ring 9 under the assembly condition, rather than the tensile test condition of two-point force application, the tensile strength value of the sealing ring 9 close to the actual assembly situation can be obtained, making the test structure more accurate.

[0023] As an implementation mode of the present utility model, a plurality of embedding grooves 12 are provided on the side wall of the inverted conical rod 1 around its circumference, and the flexible rope 3 is embedded in the embedding grooves 12 and bypasses below the sealing ring 9; by providing the embedding grooves 12, the flexible rope 3 does not contact the inner side of the sealing ring 9, and the sealing ring 9 can form a circular structure with uniform force in the circumferential direction around the inverted conical rod 1, making the test structure more accurate.

[0024] The above-described embodiments only describe the preferred implementation modes of the present utility model, and do not limit the concept and scope of the present utility model. Without departing from the design concept of the present utility model, various modifications and improvements made by those of ordinary skill in the art to the technical solutions of the present utility model should all fall within the protection scope of the present utility model. The technical content claimed by the present utility model has been fully recorded in the claims.

Claims

1. A rubber sealing ring tensile strength testing device, characterized in that: It includes an inverted conical rod that is larger at the top and smaller at the bottom, and a straight rod fixedly connected to the bottom of the inverted conical rod, a plurality of flexible ropes are fixed around the circumference of the inverted conical rod above the inverted conical rod, a mounting hole is provided in the middle of the upper part of the inverted conical rod, a cylinder is provided in the mounting hole, the telescopic end of the cylinder faces upward and is fixedly connected to a moving plate, a plurality of locking holes are provided at the edge of the moving plate around the circumference, and a locking buckle is fixed to the end of the flexible rope; a sealing ring is upwardly sleeved onto the inverted conical rod from the straight rod, the flexible rope passes between the sealing ring and the inverted conical rod and bends upward until the locking buckle at its end is buckled and connected with the locking hole.

2. A rubber sealing ring tensile strength testing device according to claim 1, characterized in that: It also includes a base, on which a threaded rod is fixedly connected, and a threaded hole threadedly connected to the threaded rod is formed on the lower end surface of the straight rod.

3. A rubber sealing ring tensile strength testing device according to claim 1 or 2, characterized in that: The side wall of the inverted cone rod is provided with a plurality of embedding grooves around its circumference, and the flexible rope is embedded in the embedding grooves and bypasses below the sealing ring.

4. A rubber sealing ring tensile strength testing device according to claim 1, characterized in that: The surface of the inverted cone rod is provided with marking scales, and the reading of the marking scales indicates the circumference of the side wall of the inverted cone rod at the current height position.

5. A rubber sealing ring tensile strength testing device according to claim 3, characterized in that: There are at least four flexible ropes, which are evenly distributed around the inverted tapered rod.

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