7results about How to "Avoid affecting test accuracy" patented technology

This invention discloses a continuous conductivity testing bench for lubricating grease and its testing method. The test bench includes a grease pump, a conductive base plate, a heating module, and an upper conductive plate. It can continuously measure the dynamic conductivity of the lubricating grease before and after breakdown and before and after blockage at a preset temperature, calculate the average conductivity during the continuous thickness change process, and conclude that the grease thickness is different when breakdown and blockage occur. It obtains the accurate values ​​of the grease thickness in the test area corresponding to each breakdown and blockage. In the blockage analysis, the volume of the grease to be injected into the test area is calculated by integration. Based on the instantaneous volume flow rate detected by the elliptical gear flow meter, the actual volume of the grease to be injected into the test area is calculated, and the flow rate of the grease pump is adjusted to ensure that the difference between the volume of the grease to be injected into the test area and the actual volume of the grease injected into the test area is within a preset range. This avoids the pressure changes caused by insufficient grease thickness or excessive grease affecting the test accuracy.

The utility model relates to the technical field of road tests, and discloses a road base material universal testing machine which comprises a machine base, a conveying base is fixedly installed on the bottom side of the machine base, a filtering box is movably installed on the inner side of the conveying base, and a water accumulation box is installed on the bottom side of the conveying base through bolts. The simulated road is placed on the inner side of the groove in the top side of the machine base, in the using process, through the partition plate, supporting uniformity can be improved, meanwhile, it can be avoided that the simulated road makes direct contact with the groove, and consequently the permeability of simulated rainwater in the later period is reduced; the electric push rod is started to drive the splash-proof cover to move downwards and extrude and limit the periphery of the simulated road, so that the situation that the test precision is influenced by side wings of the simulated road when rainwater is simulated is avoided, and in the rainwater simulation process, a water source is prevented from splashing under the action of the splash-proof cover, and the test efficiency is improved. And the viewing and observation of workers are influenced while the resources are wasted.

The utility model provides a test system for simulating and detecting refrigerant leakage, which comprises a water pipeline simulation system in a heat pump unit. The heat pump unit inner water pipeline simulation system comprises a first check valve, a refrigerant leakage detection device in pipeline connection with the water outlet end of the first check valve, an exhaust tank connected with the water outlet end of the refrigerant leakage detection device and an electric stop valve connected with the water outlet end of the exhaust tank, and the refrigerant leakage detection device is electrically connected with the input end of the controller. The output end of the controller is electrically connected with the electric stop valve, a first safety assembly is installed at an exhaust port of the exhaust tank, an air inlet is formed in a pipeline between the first check valve and the refrigerant leakage detection device, and the gas filling system is connected with the water pipeline simulation system in the heat pump unit through the air inlet. According to the utility model, the refrigerant pressure and the leakage speed of the heat pump unit in different operation conditions can be simulated truly, the response time and the control function of the detection device can be verified effectively, the safety is high, and the time and the cost are saved.

The invention belongs to the technical field of compressor diaphragm testing, and particularly relates to a compressor diaphragm fatigue performance testing device and method. The compressor diaphragm fatigue performance testing device comprises a first tool piece and a second tool piece which are matched with each other, a first tool face of the first tool piece is provided with a first testing cavity, and a second tool face of the second tool piece is provided with a second testing cavity; the first test diaphragm is arranged on the first tool surface and seals the first test cavity; the second test diaphragm is arranged on the second tool surface and seals the second test cavity; the sensor is arranged between the first tool piece and the second tool piece and is used for detecting leakage of the test diaphragm; testing gas is arranged in the first testing cavity, and circulating pressure is injected into the second testing cavity, so that the first testing diaphragm and the second testing diaphragm do reciprocating motion.

The invention discloses a universal needle bed testing machine capable of adapting to PCBAs of multiple models, and relates to the technical field of PCBA testing, the universal needle bed testing machine comprises a machine and a testing upper computer installed on the upper side of the machine, a plurality of sliding grooves are formed in the upper end of the machine, clamping assemblies are installed in the sliding grooves in a sliding mode, and each clamping assembly comprises a support installed in the corresponding sliding groove in a sliding mode. A movable frame is arranged in the middle of the support in a penetrating mode, an inclined face is arranged at the end, close to the center of the machine table, of the movable frame, a guide groove is formed in the side, close to the center of the machine table, of the support, and a pressing assembly is installed in the guide groove and comprises a pressing block slidably installed in the guide groove. Through the clamping assembly capable of sliding along the sliding groove and the adjustable moving frame structure, special clamps do not need to be replaced for PCBA plates of different sizes and models, clamping and fixing of the plates of different specifications can be achieved only by adjusting the position of the support, the universality of the equipment is greatly improved, the application range of the equipment is greatly widened, and the practicability is high. And the equipment investment cost of multi-model product detection is reduced.

The utility model relates to the technical field of steel bar testing, and discloses a prestressed tendon reverse bending fatigue testing device which comprises a base, a movable frame is movably installed on the top side of the base, a connecting rod is arranged on the right side of the movable frame, and a placing table is fixedly installed on the top side of the movable frame. A limiting seat is movably installed on the top side of the containing table, a guide frame is movably installed on the top side of the base, and a blocking seat is fixedly installed on the top side of the guide frame. In the bending fatigue testing process, the two ends of the reinforcing steel bar can tilt by an amplitude, the two ends of the reinforcing steel bar are clamped with the chutes in the bottom sides of the limiting seats at the moment, so that limiting is carried out, and the limiting seats are pushed to move when the two ends of the reinforcing steel bar continuously tilt in the testing process; in the process, the reinforcing steel bars are limited through counter-acting force generated by the fastening springs, meanwhile, the placing table movable frame is pulled to move, the testing stability is improved, the reinforcing steel bars are prevented from being popped out, and then the testing safety is improved.

This invention discloses a testing device for a terrestrial laser communication terminal, relating to the field of communication terminal testing technology. It includes a housing assembly, a terminal mounting assembly located in the center of the housing assembly's inner cavity, a circulating salt spray assembly located at the bottom of the housing assembly's inner cavity, an accelerated dissolution assembly located inside the circulating salt spray assembly, and a quantitative feeding assembly connected to the accelerated dissolution assembly located at the rear of the housing assembly. The accelerated dissolution assembly includes a flow guide fixedly connected to the bottom of a storage hopper, the front end of which extends into a salt solution recovery tank and is fixedly connected to a piston cylinder. A barrier net is fixedly installed at the bottom of the piston cylinder. This invention can avoid the impact of excessive salt solution concentration differences on testing accuracy, and can also restore the used salt solution, reducing the amount of salt solution used during testing, thus reducing wastewater production and lowering testing costs and difficulty.