A hydraulic abrasion resistance detection device and detection method thereof

Abstract

The invention discloses a hydraulic anti-abrasion testing device, comprising a high-speed water flow scouring system, a bed load impact system and a specimen test bench, wherein the high-speed water flow scouring system comprises a high-pressure water gun and a water-sand mixing tank, wherein the high-pressure water gun and the water-sand mixing tank are connected, wherein a to-be-tested specimen is arranged on the specimen test bench, wherein the high-pressure water gun sprays the water-sand mixture onto the to-be-tested specimen, wherein the high-speed water flow scouring system further comprises a high-pressure water device, wherein the high-pressure water gun is connected to the high-pressure water device through a pipeline, and wherein the high-pressure water device is connected to the bed load impact system through a pipeline; the hydraulic anti-abrasion testing device and the testing method of the invention can individually or comprehensively simulate the process of bed load impact, high-speed water flow scouring, and high-speed sand-carrying water flow scouring to scour concrete and other materials by scouring, and the testing method is efficient and convenient, easy to operate, and highly practical.

Description

Technical Field

[0001] The invention relates to the field of flow channel protection for hydraulic structures, and in particular to hydraulic abrasion resistance detection equipment and a detection method thereof. Background Art

[0002] Erosion damage to hydraulic structures has always been one of the common diseases of hydraulic structures. In particular, high-speed water flow carrying mud, sand, bedload pebbles, and debris has caused serious erosion damage to the flow channel of the spillway structures, such as the Yingxiuwan Hydropower Station, Liuhong Hydropower Station, Gongzui Hydropower Station, Banduo Hydropower Station, Suzhi Hydropower Station, and Nepal Shangma Xiangdi Hydropower Station.

[0003] The current industry standard "Test Procedure for Hydraulic Concrete" DL / T 5150 mainly uses high-speed water flow to scour ordinary resistant concrete, which has small wear and cannot simulate the movement and damage of pebble bedload rolling and jumping on the concrete surface. Materials with high resistant strength tested according to the "Test Procedure for Hydraulic Concrete" DL / T 5150 method still cannot effectively resist the damage of bedload and cannot meet normal use. Summary of the invention

[0004] The purpose of the present invention is to solve the above-mentioned problems and to provide a hydraulic anti-abrasion detection equipment and its detection method which can individually or comprehensively simulate the process of impact of bed load, high-speed water flow scouring, and high-speed sand-carrying water flow scouring to cause scouring and abrasion damage to materials such as concrete. The detection method is efficient and convenient, the operation is convenient, and the practicability is strong.

[0005] To achieve the above-mentioned purpose, the technical solution of the present invention is: a hydraulic anti-wear testing equipment, including a high-speed water flow flushing system, a bed load impact system and a specimen test bench, the high-speed water flow flushing system includes a high-pressure water gun and a water-sand mixing tank, the high-pressure water gun and the water-sand mixing tank are connected, the specimen test bench is provided with a specimen to be tested, and the high-pressure water gun sprays the water-sand mixture onto the specimen to be tested.

[0006] Preferably, the high-speed water flow flushing system also includes a high-pressure water device, the high-pressure water gun is connected to the high-pressure water device through a pipeline, and the high-pressure water device is connected to the bedload impact system through a pipeline.

[0007] Preferably, the bed load impact system includes a lifting motor, a lifting device and a collecting hopper. One side of the collecting hopper is connected to the specimen testing table. A filter screen is also provided in the collecting hopper. A water storage tank is provided below the filter screen. The lifting device is linked with the lifting motor to discharge the sand and gravel on the filter screen from the discharge port.

[0008] Preferably, the piece to be tested is located directly below the discharge port, ensuring that the bed load falls onto the piece to be tested when it freely falls at the discharge port.

[0009] Preferably, the specimen test bench is set up at an incline, a discharge trough is provided on the surface of the specimen test bench, and the discharge trough is set up along the length direction of the specimen test bench, and the high-speed water flow flushing system and the bed load impact system are connected through the specimen test bench.

[0010] Preferably, the angle of the high-pressure water gun is adjustable, and the distance between the high-pressure water gun and the test piece is adjustable.

[0011] Preferably, the water-sand mixing tank is provided with a valve for controlling the sand output speed and a stirring device, the stirring device comprises a vertical stirring shaft and stirring blades, the stirring blades are rectangular, and the stirring shaft is driven by a motor.

[0012] A method for testing hydraulic anti-abrasion testing equipment comprises the following steps:

[0013] (1) Preparation: The material to be tested is molded into a size of 400*400*100mm and cured to the age to be tested. The specimen is weighed and fixed on the test table. 100kg of bedload aggregate with a particle size range of 10-200mm is placed in the aggregate hopper. 50kg of 40-70 mesh fine sand and 80kg of clean water are weighed and stored in a water-sand mixing tank. The distance between the upper end of the specimen and the discharge port is set to 5-1.5m.

[0014] (2) Test process: After the specimen is fixed, open the lifting equipment to continuously lift the bed load to the discharge port for free fall to perform a bed load impact test on the specimen. At the same time, the high-speed water flow system can be opened to adjust the high-speed water flow to 5-30MPa for a high-speed water flow flushing test. At the same time, the valve of the water-sand mixing tank can be opened to perform a high-speed sand flushing test. The bed load and water enter the collecting hopper through the chute. The bed load screened by the screen can be recycled for impact testing. The screened water can enter the water storage tank for recycling;

[0015] (3) After the test, check the wear degree of the test piece.

[0016] Preferably, in step (3), the wear volume, wear amount and wear rate of the test piece are measured and calculated.

[0017] Preferably, the wear volume is calculated by backfilling the wear pits and other areas with 40-100 mesh fine sand and then scraping them flat, removing excess fine sand, weighing the mass of the fine sand used for backfilling, and dividing it by the bulk density of the fine sand to obtain the wear volume. The wear amount is calculated by placing the test piece in a ventilated place to dry after impact grinding, and then weighing it, calculating the mass difference before and after wear to obtain the wear amount. The wear rate is calculated as the wear amount ÷ the mass of the test piece before the test * 100% to obtain the wear rate.

[0018] The hydraulic anti-abrasion detection equipment and the detection method disclosed in the present invention have the following beneficial effects compared with the prior art: by fixing the test piece on the test table, placing bed load of different particle sizes in the aggregate hopper, raising it to a high place through the lifting system and then allowing it to fall freely to impact and destroy the test piece, and by providing a high-speed water flow flushing system with an adjustable flow rate of water flow or sand-carrying water flow to carry out a flushing test on the test piece, and then separating the bed load and water through a screen to recover and recycle them; and the equipment can simulate the process of bed load impact, high-speed water flow flushing, and high-speed sand-carrying water flow flushing to impact and destroy concrete and other materials separately or comprehensively, so it can simulate the flushing damage of bed load of different flow rates and different sizes to the flow channel of hydraulic structures, and the detection method is efficient and convenient, easy to operate, and highly practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the hydraulic anti-abrasion testing equipment of the present invention.

[0020] Among them: 1. High-pressure water equipment; 2. Water-sand mixing tank; 3. Discharge port; 4. Lifting motor; 5. Lifting equipment; 6. Collecting hopper; 7. Filter screen; 8. Water storage tank; 9. Discharge chute; 10. Pieces to be tested; 11. High-pressure water gun. DETAILED DESCRIPTION

[0021] See also Figure 1 Embodiment 1, the technical scheme of the present invention is, a hydraulic anti-wear testing equipment, including a high-speed water flow scouring system, a bed load impact system and a specimen test bench, the high-speed water flow scouring system includes a high-pressure water gun 11 and a water-sand mixing tank 2, the high-pressure water gun 11 and the water-sand mixing tank 2 are connected, the specimen test bench is provided with a to-be-tested piece 10, the to-be-tested piece 10 is a concrete plate, the high-pressure water gun 11 sprays the water-sand mixture onto the to-be-tested piece 10, at this time, it will simulate the to-be-tested piece 10 being scoured in the river channel, which is convenient for the subsequent detection of the degree of wear of the workpiece, the to-be-tested piece 10 is placed between the high-speed water flow scouring system and the bed load impact system and are connected.

[0022] The high-speed water flow flushing system further comprises a high-pressure water device 1, the high-pressure water gun 11 is connected to the high-pressure water device 1 through a pipeline, and the high-pressure water device 1 is connected to the bedload impact system through a pipeline.

[0023] In the scheme of the present invention, the bed load impact system includes a lifting motor 4, a lifting device 5 and a collecting hopper 6, one side of the collecting hopper 6 is connected to the specimen detection platform, and a filter screen 7 is also provided in the collecting hopper 6, and a water storage tank 8 is provided below the filter screen 7. The lifting device 5 is linked with the lifting motor 4 to discharge the sand and gravel (bed load) on the filter screen 7 from the discharge port 3, wherein the test piece 10 is located directly below the discharge port 3, ensuring that the bed load falls onto the test piece 10 when it is in free fall at the discharge port 3.

[0024] In the solution of the present invention, the specimen test bench is set up at an angle, and a discharge chute 9 is provided on the surface of the specimen test bench. The discharge chute 9 is set up along the length direction of the specimen test bench, and the high-speed water flow flushing system and the bed load impact system are connected through the specimen test bench.

[0025] When the hydraulic anti-abrasion testing equipment is used, the high-pressure water gun 11 sucks water and sand into the sandblasting head and mixes it with the high-speed and high-pressure flowing water column and then impacts the test piece 10. The water-sand mixture after impact will flow through the discharge chute 9 on the test piece testing table to the collecting hopper 6. After being filtered by the filter screen 7, the liquid will fall into the water storage tank 8. The water storage tank 8 is connected to the high-pressure water equipment 1 through a pipeline to facilitate the recycling of water resources. The sand and gravel that fall on the filter screen 7 will be discharged from the discharge port 3 through the lifting motor 4 and the lifting equipment 5. The discharged bedload will freely fall onto the test piece 10 at the discharge port 3, further increasing the authenticity of the simulation experiment.

[0026] In the present invention, as a preferred embodiment, the angle of the high-pressure water gun 11 is adjustable, the distance between the high-pressure water gun 11 and the test piece 10 is adjustable, the water-sand mixing tank 2 is provided with a valve and a stirring device for controlling the sand discharge speed, the stirring device comprises a vertical stirring shaft and stirring blades, the stirring blades are rectangular, wherein the stirring shaft is driven by a motor to ensure that the sand and water are mixed; wherein the distance between the specimen detection platform and the discharge port 3 is adjustable to ensure that the bed load falls onto the test piece 10, and the number of high-pressure water guns 11 can be arranged as one or more.

[0027] The invention also discloses a method for testing hydraulic anti-abrasion testing equipment, comprising the following steps:

[0028] (1) Preparation: The material to be tested is formed into a size of 400*400*100mm and cured to the test age. The specimen is weighed and fixed on the test table. 100kg of bedload aggregate with a particle size range of 10mm is placed in the aggregate hopper. 50kg of 40-mesh fine sand and 80kg of clean water are weighed and stored in the water-sand mixing tank. The distance between the upper end of the specimen and the discharge port is set to 5-1.5m. (2) Test process: After the specimen is fixed, the lifting equipment is turned on to continuously lift the bedload to the discharge port for free fall to conduct a bedload impact test on the specimen. At the same time, the high-speed water flow system can be turned on to adjust the high-speed water flow to 5-30MPa for a high-speed water flow flushing test. At the same time, the valve of the water-sand mixing tank can be opened for a high-speed sand flushing test. The bedload and water enter the aggregate hopper through the chute. The bedload screened by the screen can be circulated for impact testing. The screened water can enter the water storage tank for circulated use.

[0029] (3) After the test, check the wear degree of the test piece.

[0030] Wherein, in the step (3), the wear volume, wear amount and wear rate of the test piece are measured and calculated.

[0031] In this detection method, the wear volume is calculated by backfilling the wear pits and other areas with 40-100 mesh fine sand and then scraping them flat, removing excess fine sand, weighing the mass of the fine sand used for backfilling, and dividing it by the bulk density of the fine sand to obtain the wear volume. The wear amount is calculated by placing the test piece in a ventilated place to dry after impact grinding, and then weighing it, calculating the mass difference before and after wear to obtain the wear amount. The wear rate is calculated as the wear amount ÷ the mass of the test piece before the test * 100% to obtain the wear rate.

[0032] Embodiment 2, based on the above embodiment:

[0033] (1) Preparation: The material to be tested is molded into a size of 400*400*100 mm and cured to the age to be tested. The specimen is weighed and fixed on the test table. 100 kg of bedload aggregate with a particle size range of 150 mm is placed in the aggregate hopper. 50 kg of 55 mesh fine sand and 80 kg of clean water are weighed and stored in a water-sand mixing tank. The distance between the upper end of the specimen and the discharge port is set to 5 to 1.5 m.

[0034] (2) Test process: After the specimen is fixed, the lifting equipment is turned on to continuously lift the bed load to the discharge port for free fall to perform a bed load impact test on the specimen. At the same time, the high-speed water flow system can be turned on to adjust the high-speed water flow to 5-30MPa for a high-speed water flow flushing test. At the same time, the valve of the water-sand mixing tank can be opened to perform a high-speed sand flushing test. The bed load and water enter the collecting hopper through the chute. The bed load screened by the screen can be recycled for impact testing. The screened water can enter the water storage tank for recycling.

[0035] (3) After the test, check the wear degree of the test piece.

[0036] Embodiment 3, based on the above embodiment:

[0037] (1) Preparation: The material to be tested is molded into a size of 400*400*100 mm and cured to the age to be tested. The specimen is weighed and fixed on the test table. 100 kg of bedload aggregate with a particle size range of 200 mm is placed in the aggregate hopper. 50 kg of 70 mesh fine sand and 80 kg of clean water are weighed and stored in a water-sand mixing tank. The distance between the upper end of the specimen and the discharge port is set to 5 to 1.5 m.

[0038] (2) Test process: After the specimen is fixed, the lifting equipment is turned on to continuously lift the bed load to the discharge port for free fall to perform a bed load impact test on the specimen. At the same time, the high-speed water flow system can be turned on to adjust the high-speed water flow to 5-30MPa for a high-speed water flow flushing test. At the same time, the valve of the water-sand mixing tank can be opened to perform a high-speed sand flushing test. The bed load and water enter the collecting hopper through the chute. The bed load screened by the screen can be recycled for impact testing. The screened water can enter the water storage tank for recycling.

[0039] (3) After the test, check the wear degree of the test piece.

[0040] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A hydraulic abrasion resistance detection method, characterized in that: The invention comprises a detection device, which comprises a high-speed water flow flushing system, a bed load impact system and a specimen test bench. The high-speed water flow flushing system comprises a high-pressure water gun and a water-sand mixing tank, which are connected to the water-sand mixing tank. A specimen to be tested is arranged on the specimen test bench, and the high-pressure water gun sprays the water-sand mixture onto the specimen to be tested. The high-speed water flow flushing system also comprises a high-pressure water device, which is connected to the high-pressure water device through a pipeline, and the high-pressure water device is connected to the bed load impact system through a pipeline. The bed load impact system comprises a lifting motor, a lifting device and a collecting hopper, one side of the collecting hopper is connected to the specimen test bench, a filter screen is also arranged in the collecting hopper, and a water storage tank is arranged below the filter screen. The lifting device and the lifting motor are linked to discharge the sand and gravel on the filter screen from the discharge port. The specimen to be tested is located directly below the discharge port to ensure that the bed load falls onto the specimen to be tested when it is in free fall at the discharge port. The specimen test bench is set up at an angle, and a discharge trough is provided on the surface of the specimen test bench, and the discharge trough is set up along the length direction of the specimen test bench. The high-speed water flow flushing system and the bed load impact system are connected through the specimen test bench; the angle of the high-pressure water gun is adjustable, and the distance between the high-pressure water gun and the test piece is adjustable; a valve and a stirring device for controlling the sand output speed are provided in the water-sand mixing tank, and the stirring device includes a vertical stirring shaft and stirring blades, and the stirring blades are rectangular, wherein the stirring shaft is driven by a motor; the detection method of the hydraulic anti-wear detection equipment comprises the following steps: (1) preparation work; The material to be tested is formed into a size of 400*400*100mm and cured to the age to be tested. The test piece is weighed and fixed on the test table. 100kg of bedload aggregate with a particle size range of 10-200mm is placed in the aggregate hopper. 50kg of 40-70 mesh fine sand and 80kg of clean water are weighed and stored in a water-sand mixing tank. The distance between the upper end of the test piece and the discharge port is set to 5-1.5m. (2) Test process: After the specimen is fixed, the lifting equipment is turned on to continuously lift the bed load to the discharge port for free fall to perform a bed load impact test on the specimen. At the same time, the high-speed water flow system can be turned on to adjust the high-speed water flow to 5-30 MPa for a high-speed water flow flushing test. At the same time, the valve of the water-sand mixing tank can be opened to perform a high-speed sand flushing test. The bed load and water enter the collecting hopper through the chute. The bed load screened by the screen can be recycled for impact testing. The screened water can enter the water storage tank for recycling; (3) After the test, the degree of wear of the test piece is detected; In the step (3), the wear volume, wear amount and wear rate of the test piece are measured and calculated; The wear volume is calculated by backfilling the wear pits and other areas with 40-100 mesh fine sand and then scraping them flat, removing excess fine sand, weighing the mass of the fine sand used for backfilling, and dividing it by the bulk density of the fine sand to obtain the wear volume; the wear amount is calculated by placing the test piece after impact grinding in a ventilated place to dry and then weighing it, calculating the mass difference before and after wear to obtain the wear amount; the wear rate is calculated as the wear amount ÷ the mass of the test piece before the test * 100% to obtain the wear rate.

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