Search

CN-121994601-A - Creep resistance detection device for PPR pipe fitting

CN121994601ACN 121994601 ACN121994601 ACN 121994601ACN-121994601-A

Abstract

The invention discloses a creep resistance detection device for a PPR pipe fitting, which comprises a base, a driving assembly and a moment loading assembly. The driving assembly drives the driving disc to rotate through the worm transmission structure, and the arc guide groove arranged on the surface of the driving disc is used for guiding two movable sliding blocks in the moment loading assembly to generate relative axial movement. The torque loading assembly comprises a sliding sleeve seat, two movable sliding blocks and a clamping sleeve piece, wherein the movable sliding blocks are oppositely arranged, conical sleeve holes are respectively formed in two ends of each movable sliding block, each clamping sleeve piece comprises an elastic ring and a plurality of clamping petals, conical step heads matched with the conical sleeve holes are arranged at two ends of each clamping petal, and the clamping sleeve piece can generate radial clamping through wedging action in the movement process of the movable sliding blocks in any direction. Through the structure, the stable detection of the creep resistance of the PPR pipe fitting under the continuous load condition is realized, and the device has the advantages of flexible loading mode, reliable clamping and high accuracy of test results.

Inventors

  • ZHANG MINGZHI
  • ZHU JIANFENG
  • ZHU DONGJIE

Assignees

  • 临海伟星新型建材有限公司
  • 浙江伟星新型建材股份有限公司

Dates

Publication Date
20260508
Application Date
20260407

Claims (8)

  1. 1. The creep resistance detection device for the PPR pipe fitting is characterized by comprising a base (100), a driving assembly (200) and a moment loading assembly (300), wherein a control box (110) is fixedly arranged on the top surface of the base (100), and the driving assembly (200) and the moment loading assembly (300) are arranged on the top surface of the base (100) and are positioned on the inner side of the control box (110); The driving assembly (200) comprises a driving disc (210), a gear motor (220) and a worm gear shaft (230) fixed at the output end of the driving disc (210), the driving disc (210) is rotatably installed on the surface of the base (100), worm gear teeth (212) meshed with the surface of the worm gear shaft (230) are arranged on the periphery of the driving disc (210), and two arc guide grooves (211) which are symmetrically arranged about the center of the driving disc (210) are formed in the surface of the driving disc (210); The torque loading assembly (300) comprises a sliding sleeve seat (310), two moving sliding blocks (320) and clamping sleeve pieces (330), and sensing rails (340) arranged on the inner side of the sliding sleeve seat (310), wherein the number of the moving sliding blocks (320) is two, the two moving sliding blocks (320) are arranged on the inner side of the sliding sleeve seat (310) in a sliding manner and are in sliding butt joint with one side of the sensing rails (340), the clamping sleeve pieces (330) are movably sleeved on the inner side of the corresponding moving sliding blocks (320), tapered sleeve holes (321) are formed in two ends of the moving sliding blocks (320), sliding pins (322) sleeved on the inner side of the arc guide groove (211) are arranged on the bottom surface of the moving sliding blocks (320), the clamping sleeve pieces (330) comprise elastic rings (331) and a plurality of clamping flaps (332) arranged on the periphery of the elastic rings (331), gaps are formed between the clamping flaps (332), tapered heads (333) are arranged at two ends of each clamping flap (332), and the tapered heads (333) are tightly sleeved on the two ends of each clamping flap (332), and the tapered heads (333) and exert a radial deformation on the clamping sleeve holes (333) in a clamping manner, so that the tapered heads and the tapered heads exert a radial deformation effect on the clamping sleeve to the inner sides (332).
  2. 2. The PPR pipe fitting creep resistance detection device according to claim 1, wherein a constant temperature control system (120) is arranged on the inner side of the control box (110), the constant temperature control system (120) comprises an electric heating component and a circulating fan component, constant temperature control on a test environment is realized by heating and circulating air flow flowing in the control box (110), and a temperature and humidity sensor is arranged in the control box (110).
  3. 3. The PPR pipe creep resistance detection device according to claim 1, wherein a test panel (130) is provided on the surface of the base (100), and the test panel (130) includes a control module for controlling the driving assembly (200), a temperature control module electrically connected to the constant temperature control system (120), and an information display module electrically connected to the constant temperature control system (120) and the sensor rail (340), respectively.
  4. 4. The PPR pipe fitting creep resistance detection device according to claim 1, wherein a hall sensor is built in the sensing rail (340), a magnetic member (341) slidably abutting against the surface of the sensing rail (340) is provided on a side surface of the movable slider (320), and the positional information of the movable slider (320) is detected in real time by the hall sensor through a displacement change of the magnetic member (341) generated on the surface of the sensing rail (340).
  5. 5. The PPR pipe fitting creep resistance detection device according to claim 1, wherein the arc guide groove (211) has an arc structure with two opposite directions, two end points of the arc guide groove (211) are symmetrically arranged about the center of the driving disc (210) at an origin, and two end points of the arc guide groove (211) are respectively close to the axial center position of the sliding sleeve seat (310) and the peripheral position of the driving disc (210).
  6. 6. The device for detecting creep resistance of a PPR pipe fitting according to claim 1, wherein the tapered heads (333) at two ends of the jacket member (330) respectively correspond to tapered sleeve holes (321) at two ends of the movable slider (320), the inner taper of the tapered sleeve holes (321) is larger than the taper of the tapered heads (333), and the jacket member (330) is centrally arranged along the axial direction of the movable slider (320) so that the tapered heads (333) are respectively inserted into the tapered sleeve holes (321) at two ends of the movable slider (320).
  7. 7. The device for detecting creep resistance of PPR pipe according to claim 1, wherein the elastic ring (331) is made of flexible rubber material, the inner diameter is larger than the outer diameter of the pipe to be detected, and the plurality of clamp flaps (332) are uniformly distributed along the circumferential direction and fix the surface of the elastic ring (331).
  8. 8. The device for detecting creep resistance of a PPR pipe according to claim 1, wherein two jacket members (330) are arranged opposite to each other along the same axis and are used for clamping two ends of a surface of the pipe to be detected.

Description

Creep resistance detection device for PPR pipe fitting Technical Field The invention relates to the technical field of pipe fitting detection devices, in particular to a creep resistance detection device for a PPR pipe fitting. Background PPR pipe fittings are widely used in building water supply and drainage and related fluid conveying systems because of the advantages of good corrosion resistance, light weight, convenient installation and the like. In the long-term use process, the PPR pipe fitting is usually under the continuous internal pressure, the installation stress or the external constraint effect, and is easy to generate creep deformation, so that the problems of pipeline deformation, connection looseness, leakage and the like are caused. Therefore, the creep resistance of the PPR pipe fitting under the continuous load condition is detected, and the creep resistance is a key link for guaranteeing the long-term use reliability of the PPR pipe fitting. The existing creep-resistant detection device for PPR pipe fittings mostly adopts a unidirectional axial loading or internal pressure loading mode, and a pressure driving structure of the creep-resistant detection device generally comprises a hydraulic cylinder, an electric push rod or a screw rod mechanism, and axial tensile load or pushing load is applied to the pipe fittings through the driving structure. The structure can only realize stretching or compressing in a single direction in a loading form, and if two testing working conditions of pulling and pushing are required to be completed in the same device, a loading mechanism or an adjusting clamping structure is often required to be replaced, so that the device is complex in structure, complex in operation and low in testing efficiency. In terms of clamping structures, common solutions in the prior art include rigid jaw clamps, screw locking clamps or unidirectional wedging clamps. The clamping mode has the following general problems that on one hand, an effective self-adaptive relation is lacking between the clamping force and the loading force, when the loading force is increased, the clamping structure is easy to axially slide due to insufficient clamping to influence the real transmission of load, and on the other hand, the initial clamping force is artificially increased to prevent sliding, and local crush injury or stress concentration is easy to be caused on the surface of the PPR pipe fitting to further influence the accuracy of a creep test result. In addition, in the existing creep-resistant detection device, the loading driving structure mostly adopts a common gear transmission, a motor direct drive or a hydraulic driving mode, the driving mode can not automatically maintain the loading position after the driving is stopped, and a brake or a locking mechanism is required to be additionally arranged to maintain the axial load. The device not only increases the structural complexity of the device, but also introduces potential load attenuation or instability risks in the long-time testing process, and is difficult to stabilize and simulate the continuous load state born by the pipe fitting under the actual working condition. Meanwhile, part of the existing detection devices adopt a unilateral loading or asymmetric clamping mode on structural design, so that the pipe fitting is easy to generate unbalanced load phenomenon in the test process, the test result is greatly influenced by clamping errors and structural deformation, repeatability and reliability are insufficient, and the requirement for accurately evaluating the creep resistance of the PPR pipe fitting is difficult to meet. In summary, the existing creep-resistant detection technology for PPR pipe still has shortcomings in the aspects of diversity of loading modes, clamping stability, continuous load holding capability, authenticity and repeatability of test results, and the like, and a novel detection device which has reasonable structure, flexible loading modes, reliable clamping and can stably hold load in a constant temperature environment is needed to overcome the defects. Disclosure of Invention The invention aims to solve the problems that a PPR pipe creep resistance detection device in the prior art is single in loading mode, insufficient in clamping stability, difficult to maintain in continuous load, poor in test result authenticity and repeatability and the like. The device realizes that a retainable axial traction load or a pushing load is applied to the PPR pipe fitting in a constant temperature environment through the integral design of a loading driving structure, a clamping structure and a motion conversion mode, and automatically forms stable clamping in the loading process, thereby more truly reflecting the creep deformation condition of the pipe fitting under the long-term stress condition. In order to achieve the above purpose, the invention adopts the following technical scheme: The invention provides a cr