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CN-122016294-A - Large-tonnage valve high-temperature fatigue wear test device

CN122016294ACN 122016294 ACN122016294 ACN 122016294ACN-122016294-A

Abstract

The invention discloses a high-temperature fatigue wear test device for a large-tonnage valve, which comprises a frame, a loading platform, a lifting mechanism for driving the loading platform to lift, a heating mechanism for heating a valve seat ring, a rotary driving mechanism for driving the valve to rotate, a valve displacement control mechanism for driving the valve to reset and a pressing mechanism, wherein the pressing mechanism comprises a pressing driving assembly, a large disc spring assembly and a small disc spring assembly which sequentially transmit loads, the pressing driving assembly comprises at least two eccentric cams which are driven by the same rotary driving shaft and have phase differences, and at least two power transmission units which are arranged in one-to-one correspondence with the at least two eccentric cams, and the eccentric distances of the at least two eccentric cams are different, so that at least two different working conditions in valve opening, seating and burst pressure impact are simulated. The problem that the prior art can not simulate the multi-working condition and large tonnage impact of the air valve at the same time is solved.

Inventors

  • QU RONG
  • ZHAO WEIMING
  • HUANG ZHIGANG
  • SU DETAO
  • LAI FUQIANG
  • SU DA

Assignees

  • 怀集登月气门有限公司

Dates

Publication Date
20260512
Application Date
20260316

Claims (14)

  1. 1. The utility model provides a large-tonnage valve high temperature fatigue wear test device which characterized in that includes: A frame; The loading platform is arranged on the frame and is provided with a valve, a valve seat ring matched with a valve head, a rotary driving mechanism for driving the valve to rotate and a valve displacement control mechanism for driving the valve to reset; The lifting mechanism is arranged on the frame and used for driving the loading platform to vertically lift; The heating mechanism is arranged on the frame and used for heating the valve seat ring; The device comprises a pressing mechanism, a pressing driving assembly, a large disc spring assembly and a small disc spring assembly, wherein the pressing driving assembly sequentially transmits loads, the pressing driving assembly comprises at least two eccentric cams which are driven by the same rotary driving shaft and have phase differences, and at least two paths of power transmission units which are arranged in one-to-one correspondence with the at least two eccentric cams, each path of power transmission unit comprises a transmission part, a driving hammer and a fixed guide structure, a first end of the transmission part is connected with the corresponding eccentric cams, a second end of the transmission part is hinged with the driving hammer, the driving hammer is in sliding connection with the guide structure, each eccentric cam is configured to drive the corresponding driving hammer through the corresponding transmission part under the constraint of the guide structure, each driving hammer makes reciprocating linear motion along a set linear path, the large disc spring assembly is configured to receive the acting force output by the driving hammer so as to make linear reciprocating motion, the load of the large disc spring assembly is adjustable, the input end of the small disc spring assembly is connected with the output end of the large disc spring assembly, the driving hammer is used for at least two eccentric disc spring assemblies which can not open the same as the driving hammer, and the small disc spring assembly can not respectively press the two eccentric disc spring assemblies, and the driving assembly can respectively, and the driving assembly can not open the two eccentric disc spring assemblies and the driving assembly.
  2. 2. The high-temperature fatigue wear test device for the large-tonnage valve according to claim 1, wherein the at least two eccentric cams comprise a middle eccentric cam and two side eccentric cams, the at least two transmission units comprise a middle hammer and two side hammers, the eccentric distance of the middle eccentric cam is smaller than that of the side eccentric cams, the middle eccentric cam drives the large disc spring assembly through the middle hammer to generate a first impact so as to simulate a valve seating condition, and the two side eccentric cams respectively drive the large disc spring assembly through the corresponding side hammers to generate a second impact larger than the first impact so as to simulate a detonation pressure impact condition.
  3. 3. The high-temperature fatigue wear test device for the large-tonnage valve according to claim 1, wherein the large disc spring assembly comprises a first shell, a large disc spring group and a hammer head, wherein the first shell is in sliding connection with a frame, the large disc spring group is accommodated in the first shell, the hammer head is connected with the large disc spring group, the first shell is provided with a detachable maintenance panel, the number of the large disc spring group can be increased or decreased or replaced by opening the maintenance panel, so that the load size of the large disc spring assembly can be adjusted, the head of the hammer head is provided with a pressure sensor, and the hammer head forms an output end of the large disc spring assembly.
  4. 4. The large-tonnage valve high-temperature fatigue wear testing device according to claim 3, wherein the first housing is provided with a large disc spring cavity for accommodating the large disc spring group, a large disc spring cover is installed on the upper side of the large disc spring cavity, a mounting block and an adjusting block are arranged on the lower side of the large disc spring cavity, a bearing surface for bearing the large disc spring group is formed on the upper portion of the mounting block, the adjusting block is arranged below the mounting block and is connected with the mounting block through opposite inclined planes in a matched mode, the first housing is provided with an adjusting bolt, a rod portion of the adjusting bolt penetrates through the first housing and is in threaded connection with the adjusting block, and the adjusting bolt can drive the adjusting block to move relative to the mounting block through rotation, so that the axial position of the mounting block is changed, and the pretightening force of the large disc spring group is adjusted.
  5. 5. The high-tonnage valve high temperature fatigue wear testing apparatus according to claim 1, wherein the small disc spring assembly comprises: A second housing fixedly mounted on the frame; The displacement element is movably arranged in the second shell, is connected with the output end of the big disc spring component and can be driven by the displacement element to axially move, the displacement element is provided with a small disc spring cavity, The mounting bottom plate is movably arranged in the small disc spring cavity, The lower end of the small disc spring group is arranged on the mounting bottom plate; the lower end of the disc spring shaft penetrates through the small disc spring group, the lower end of the disc spring shaft is limited to move in the small disc spring cavity, the upper end of the disc spring shaft penetrating out of the second shell is provided with a plug, the plug forms the output end of the small disc spring assembly, and the distance between the plug and the valve can be adjusted by adjusting the number of the small disc spring group.
  6. 6. The high-temperature fatigue wear test device for the large-tonnage valve according to claim 5, wherein the small disc spring assembly further comprises an adjusting nut, the displacement element is provided with a threaded section, the adjusting nut is screwed on the threaded section, the end face of the adjusting nut is provided with a plurality of pushing pieces, the pushing pieces are abutted against the mounting base plate after penetrating through holes reserved in the displacement element, and the axial position of the pushing pieces on the threaded section is changed by rotating the adjusting nut, so that the pushing pieces can be driven to push the mounting base plate to move in the small disc spring cavity, and the pre-tightening state of the small disc spring group is adjusted.
  7. 7. The large-tonnage valve high temperature fatigue wear testing device according to claim 5, wherein the upper end of the disc spring shaft is provided with a clamping component for clamping the plug, the clamping component comprises a connecting plate, a chuck base, a collet chuck and a chuck locking nut, a groove for jogged installation with the upper end of the disc spring shaft is arranged at the bottom of the connecting plate, the chuck base is fixed on the connecting plate, the collet chuck is installed in a central hole of the chuck base and fixed between the collet chuck and the central hole through inclined plane fit, the chuck locking nut is in threaded connection with the chuck base, the chuck locking nut is fixed with the collet chuck through inclined plane fit, and the fixed end of the plug is clamped and fixed by the collet chuck.
  8. 8. The large-tonnage valve high-temperature fatigue wear test device according to claim 1, wherein the lifting mechanism comprises a lifting driving source, a transmission assembly and two worm and gear lifters for lifting the loading platform, each worm and gear lifter comprises a first worm wheel and a first worm which are meshed with each other, a screw rod which is driven by the first worm wheel and can vertically move, the upper end of the screw rod movably penetrates through a mounting plate at the top of the rack, the lower end of the screw rod is fixedly connected with the loading platform, the first worms of the two worm and gear lifters are coaxially connected through a coupler to realize synchronous input, the end part of one first worm is fixedly provided with an input gear, the lifting driving source comprises a handle rotatably arranged on the rack, and a driving gear coaxially fixed on a rotating shaft of the handle, and the input gear and the driving gear are connected through the transmission assembly.
  9. 9. The high-temperature fatigue wear test device for the large-tonnage valve according to claim 1, wherein the rotary driving mechanism comprises a gear reduction motor, a second worm wheel and a second worm and a connecting shaft which are in meshed transmission, the second worm is in driving connection with an output shaft of the gear reduction motor, the second worm wheel is connected with the connecting shaft through a shaft hole matching structure so as to drive the connecting shaft to synchronously rotate, and the connecting shaft is used for driving the valve to rotate.
  10. 10. The high-temperature fatigue wear testing device for large tonnage valve according to claim 9, wherein one end of the connecting shaft for connecting with the valve is provided with an adjustable locking mechanism for clamping and locking the valve tail, the adjustable locking mechanism comprises an axial center hole provided on the end surface of the connecting shaft, and a locking element, the locking element can be operated to change the aperture of the axial center hole, so as to clamp or unclamp the valve tail.
  11. 11. The high-temperature fatigue wear test device for the large-tonnage valve according to claim 9 or 10, wherein the valve displacement control mechanism comprises a spring chamber and a return spring arranged in the spring chamber, the tail part of the valve extends into the spring chamber and is fixedly connected with one end of a connecting shaft, one end of the connecting shaft for connecting the valve is sleeved with an upper thrust ball bearing and a lower thrust ball bearing, the return spring is sleeved outside the connecting shaft, and two ends of the return spring are respectively abutted between the inner end face of the spring chamber and the upper thrust ball bearing.
  12. 12. The large-tonnage valve high-temperature fatigue wear test device according to claim 1, wherein the heating mechanism comprises an induction heater and an electric heating coil connected with the induction heater, the electric heating coil is coiled below the valve seat ring, the inner diameter of the innermost ring of the electric heating coil is larger than the outer diameter of the valve seat ring, an annular heat preservation cover is arranged on the outer side of the electric heating coil and is fixed on a loading platform, a cooling cylinder is mounted on the loading platform, a circulating water cooling cavity and an axial channel are formed in the cooling cylinder, the circulating water cooling cavity is connected with an external water source, and the rod part of the valve is positioned in the axial channel.
  13. 13. The high-tonnage valve high temperature fatigue wear testing equipment according to claim 1, further comprising a temperature measuring mechanism, wherein the temperature measuring mechanism comprises a thermocouple and an infrared thermometer, wherein the head of the thermocouple is configured to be aligned with the stem of the valve, and wherein the optical probe of the infrared thermometer is configured to be aligned with the valve retainer, and wherein the operating temperature of the infrared thermometer is measured in a non-contact manner.
  14. 14. The large-tonnage valve high temperature fatigue wear testing device according to claim 12, wherein the bottom of the cooling cylinder is provided with a valve clamp, the valve clamp is provided with a groove matched with the valve seat ring, a conduit used for wrapping a valve stem is arranged in the axial passage, the upper end surface of the valve clamp is provided with a through hole for the valve stem to penetrate into the conduit, and the conduit is abutted against the upper end surface of the valve clamp so as to restrict the conduit from moving downwards.

Description

Large-tonnage valve high-temperature fatigue wear test device Technical Field The invention relates to the technical field of valve testing, in particular to a high-temperature fatigue wear test device for a large-tonnage valve. Background The valve-seat ring contact pair ensures the sealing of the combustion chamber, is an important part of the combustion chamber and controls the 'breathing' of the engine. With the continuous improvement of the technical level of the engine in China, the engine is required to have higher power density, namely larger power and smaller volume, so that the temperature and the pressure in the engine cylinder are continuously improved, and the working environment of parts of the engine is further deteriorated. Meanwhile, as the requirements for reliability are continuously improved, higher requirements are put forward on various parts of the engine. In addition, due to the use of clean fuels such as natural gas in recent years, the combustion temperature in the engine cylinder is higher and the combustion products are cleaner. For gasoline and diesel engines, proper combustion product coverage on the contact surfaces may provide some lubrication and protection, but for natural gas engines this "protection" is greatly reduced. When the engine is in one working cycle, the inlet valve and the exhaust valve are required to be opened and closed once, and in the process, the valve is required to bear frequently reciprocating seating impact, direct flushing of high-temperature fuel gas and corrosion of waste gas, so that the working environment is bad. For example, the actual temperature of the valve disc bottom plane of the high-performance diesel engine is about 700-800 ℃, the combustion explosion pressure is increased from 20bar or less to 25-30bar, and the impact load applied to the valve is also greatly increased. The high-temperature impact abrasion device for the valve with the temperature of 150kN can more accurately simulate the high-temperature and high-pressure impact environment of the valve in actual work, so that the abrasion condition of the valve can be reflected more truly. And therefore, places higher demands on the performance of the valve. The existing traditional method for evaluating the high-temperature abrasion performance of the valve has obvious limitations. Although the whole engine test can reflect the real working condition, the cycle is long, the cost is high, the operation is complex, and the rapid research and development requirement is difficult to adapt. The material-level friction and wear test can only test the properties of basic materials, and can not reproduce the dynamic behaviors of the valve in the working cycle of the engine, such as the coupling effect of rotary motion, seating impact and detonation pressure impact, so that the valve sinking mechanism caused by wear in actual use can not be accurately captured. The test data of the special valve high-temperature abrasion test device are obviously different from the material level test, and the necessity of special equipment is highlighted. The existing device mostly adopts a mechanical or hydraulic driving mode, the mechanical driving structure is simple, the load loading precision is low, the seating frequency is limited, the high-dynamic working condition is difficult to accurately simulate, the hydraulic driving is quick in response and can realize the large load loading, the environment is polluted by oil liquid leakage easily, and the equipment purchase and maintenance cost is too high. In addition, most of the current devices lack the capability of simultaneously simulating the rotation working condition of the valve and the high-tonnage detonation pressure impact, and particularly, the stable reproduction of the 150 kN-level instant impact force cannot be realized, so that the test result deviates from the actual engine running state, and the fatigue wear characteristics of the valve under the high-temperature high-pressure composite stress cannot be comprehensively estimated. In view of the above, there is a need in the art for improvements. Disclosure of Invention In view of the above drawbacks of the prior art, the present invention provides a method. The invention is realized by adopting the following technical scheme: the utility model provides a large-tonnage valve high temperature fatigue wear test device which characterized in that includes: A frame; The loading platform is arranged on the frame and is provided with a valve, a valve seat ring matched with a valve head, a rotary driving mechanism for driving the valve to rotate and a valve displacement control mechanism for driving the valve to reset; The lifting mechanism is arranged on the frame and used for driving the loading platform to vertically lift; The heating mechanism is arranged on the frame and used for heating the valve seat ring; The device comprises a pressing mechanism, a pressing driving assembly, a large dis