Nonmetal chain type mud scraper wear limit testing device and testing method thereof

Abstract

The invention discloses a non-metal chain type mud scraper abrasion limit testing device and a testing method thereof, and relates to the field of experimental testing devices, the non-metal chain type mud scraper abrasion limit testing device comprises a main machine system which comprises a main shaft, a friction pair testing shaft, a load connecting shaft and an annular chain, and the main shaft, the friction pair testing shaft and the load connecting shaft are sleeved with the annular chain; the friction pair testing system is arranged on the friction pair testing shaft, the friction pair testing system comprises a static ring and a movable ring, the static ring sleeves the friction pair testing shaft, the movable ring and the annular chain synchronously rotate, and the movable ring and the static ring mutually rotate and rub; the load system is connected with the load connecting shaft; according to the device, the structural wear life cycle of the mud scraper is predicted through an accelerated testing method, the material of the optimal friction pair is selected, and the service life of the mud scraper is prolonged.

Description

Technical Field

[0001] The invention belongs to the field of experimental testing devices, and more specifically, relates to a non-metallic chain type scraper wear limit testing device and a testing method thereof. Background Art

[0002] Non-metallic chain scrapers are suitable for rectangular sedimentation tanks to achieve surface skimming and bottom scraping due to their light weight and corrosion resistance. However, due to the different pool types and sand content in the sedimentation tank process of sewage treatment plants, the wear of scrapers varies greatly, and it is impossible to estimate and judge the wear, and the equipment cannot be maintained and serviced in time, resulting in chain link skipping, breakage and other operational failures due to severe wear. Summary of the invention

[0003] The purpose of the present invention is to address the deficiencies in the prior art and to provide a non-metallic chain scraper wear limit testing device and a testing method thereof. The device predicts the structural wear life cycle of the scraper through an accelerated testing method, selects the optimal friction pair material, and extends the service life of the scraper.

[0004] In order to achieve the above object, the present invention provides a non-metallic chain scraper wear limit testing device, comprising:

[0005] The host system comprises a main shaft, a friction pair test shaft, a load connection shaft and an annular chain, wherein the annular chain is sleeved on the main shaft, the friction pair test shaft and the load connection shaft;

[0006] A friction pair test system is arranged on the friction pair test shaft, and the friction pair test system comprises a stationary ring and a dynamic ring, wherein the stationary ring is sleeved on the friction pair test shaft, the dynamic ring rotates synchronously with the annular chain, and the dynamic ring and the stationary ring rotate and rub against each other;

[0007] A load system is connected with the load connecting shaft.

[0008] Optionally, the host system includes a sewage tank, the ring chain, the main shaft, the friction pair test shaft and the load connection shaft are arranged in the sewage tank, and a drive motor is arranged above the sewage tank, and the drive motor is connected to the main shaft.

[0009] Optionally, the driving motor is drivingly connected to the middle of the main shaft through a transmission belt, and both ends of the main shaft are drivingly connected to the annular chain through driving wheels respectively.

[0010] Optionally, the friction pair test systems are respectively arranged at two ends of the friction pair test shaft.

[0011] Optionally, the driving motor is a variable frequency motor.

[0012] Optionally, the inner surface of the dynamic ring is rotatably fitted with the outer surface of the static ring, and the dynamic ring and the static ring are made of different materials.

[0013] Optionally, the load system includes a pulley group and a counterweight group, the pulley group includes a plurality of fixed pulleys and a movable pulley, a traction rope is wound around the fixed pulley and the movable pulley, one end of the traction rope is connected to the counterweight group, and the other end of the traction rope is connected to the load connecting shaft, and the traction rope drives the load connecting shaft to be squeezed toward the fitting point with the ring chain.

[0014] Optionally, the counterweight group includes a connecting pin and a plurality of counterweight blocks, the top end of the connecting pin is connected to one end of the traction rope, and the counterweight block is detachably connected to the connecting pin.

[0015] Optionally, it also includes a process simulation system, which includes a circulation pump, a suspended matter concentration sensor and a sand content meter. The circulation pump is arranged on the water inlet pipe of the sewage tank, and the suspended matter concentration sensor and the sand content meter are also arranged on the water inlet pipe.

[0016] The present invention also provides a non-metallic chain type scraper wear limit testing method, using the above-mentioned non-metallic chain type scraper wear limit testing device, the testing method comprises:

[0017] The dynamic ring and the static ring made of different materials are mounted on the friction pair test shaft, and the load system applies a force to the load connection shaft;

[0018] Sewage is injected into the main engine system, and the annular chain is driven to rotate by the main shaft to obtain the optimal friction pair of the friction pair testing system.

[0019] The present invention provides a non-metallic chain scraper wear limit testing device and a testing method thereof, and the beneficial effects are: the testing device simulates a real non-metallic chain scraper through a host system, adopts a main shaft as a power source to drive the ring chain to rotate, and is further provided with a load system to simulate the resistance of the scraper plate brought by the precipitated sludge in the sedimentation tank, and the load system can realize the output of different resistance values ​​by increasing or decreasing the counterweight block, and the friction pair testing system is arranged on other rotating shafts, and the dynamic ring and static ring of different materials are respectively fixedly connected with the ring chain and the friction pair testing shaft, and the friction pair between the dynamic ring and the static ring is measured, so that the wear life of the scraper of different materials can be predicted, and the optimal friction pair material is obtained as the transmission material between the ring chain and the rotating shaft, so as to reduce the probability of operation failure and the frequency of equipment maintenance, and optimize the economic cost of equipment use.

[0020] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and other objects, features and advantages of the present invention will become more apparent through a more detailed description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, wherein like reference numerals generally represent like components throughout the exemplary embodiments of the present invention.

[0022] Figure 1 A schematic structural diagram of a non-metallic chain scraper wear limit testing device according to an embodiment of the present invention is shown.

[0023] Figure 2 A lateral cross-sectional view of a host system according to an embodiment of the present invention is shown.

[0024] Figure 3 A connection schematic diagram of a friction pair test shaft according to an embodiment of the present invention is shown.

[0025] Description of reference numerals:

[0026] 1. Main machine system; 2. Main shaft; 3. Friction pair test shaft; 4. Load connecting shaft; 5. Ring chain; 6. Process simulation system; 7. Static ring; 8. Moving ring; 9. Load system; 10. Sewage tank; 11. Drive motor; 12. Fixed pulley; 13. Moving pulley; 14. Traction rope; 15. Connecting pin; 16. Counterweight; 17. Circulation pump. DETAILED DESCRIPTION

[0027] The preferred embodiments of the present invention will be described in more detail below. Although the preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0028] The present invention provides a non-metallic chain type scraper wear limit testing device, comprising:

[0029] The host system includes a main shaft, a friction pair test shaft, a load connecting shaft and an annular chain, wherein the annular chain is sleeved on the main shaft, the friction pair test shaft and the load connecting shaft;

[0030] The friction pair test system is arranged on the friction pair test shaft. The friction pair test system includes a stationary ring and a dynamic ring. The stationary ring is sleeved on the friction pair test shaft. The dynamic ring rotates synchronously with the ring chain. The dynamic ring and the stationary ring rotate and rub against each other.

[0031] A load system is connected to the load connecting shaft.

[0032] Specifically, the test device includes a main engine system, a friction pair test system and a load system. The main engine system is simulated and set according to the structure of an existing non-metallic chain scraper. The friction pair test system is installed on the friction pair test shaft, and the load system is connected to the load connecting shaft. In this way, when the annular chain rotates in the main engine system, different rotation speeds can be output to the annular chain through the main shaft, and different resistances can be output to the annular chain through the load system. In this way, different operating modes can be simulated, and the rotation speed and rotation resistance can be changed. The entire use process of the scraper can be quickly simulated, and the friction pair between the moving ring and the static ring in the friction pair test system can be obtained. The change of the friction pair between the moving ring and the static ring of different materials can be obtained, and the use cycle of the scraper using different materials can be mastered. In order to avoid the occurrence of chain link tooth jumping, breakage, etc., the scraper equipment maintenance and maintenance should be carried out in advance to reduce the probability of shutdown caused by excessive use and wear of the scraper.

[0033] The working principle of the test device is: the purpose of the wear acceleration limit test is to increase the wear load (i.e. PV value, P is the load N, V ​​is the speed m / s) as a means to reach the predetermined wear amount (failure limit) in a shorter time, obtain the time period, and make life predictions.

[0034] Optionally, the host system includes a sewage tank, the ring chain, the main shaft, the friction pair test shaft and the load connection shaft are arranged in the sewage tank, and a drive motor is arranged above the sewage tank, and the drive motor is connected to the main shaft.

[0035] Specifically, the host system simulates the structure of an existing non-metallic chain scraper, which generally adopts a four-axis form. The four rotating shafts include a main shaft, a friction pair test shaft and a load connecting shaft. The drive motor is connected to the main shaft and transmits rotational force to the circular chain, simulating the state in which the rotation of the circular chain drives the scraper to push the settled sludge during normal operation. The load system applies a force to the load connecting shaft, and then applies a force to the circular chain through the load connecting shaft, simulating the rotational resistance applied to the circular chain by the settled sludge in the sedimentation tank during normal operation. The friction pair test system is arranged between the friction pair test shaft and the circular chain to obtain the friction pair changes between the materials of the two, so as to understand the wear changes and life cycle of the scraper.

[0036] Optionally, the driving motor is connected to the middle of the main shaft through a transmission belt, and both ends of the main shaft are connected to the ring chain through driving wheels.

[0037] Optionally, the driving motor is a variable frequency motor.

[0038] Specifically, the driving motor is connected to the transmission wheel in the middle of the main shaft through a transmission belt, and the driving motor outputs power to drive the main shaft to rotate, so that the rotation of the ring chain can be realized; when the main shaft rotates, the main shaft is connected and transmitted to the ring chain through the driving wheels at both ends, so that the movement of the ring chain can be realized. The driving motor can change the walking speed of the ring chain by adjusting the speed. Under the condition of keeping the abrasive wear failure mechanism unchanged, the test cycle is shortened and the wear life can be quickly predicted.

[0039] Optionally, the friction pair test systems are respectively arranged at two ends of the friction pair test shaft.

[0040] Optionally, the inner surface of the dynamic ring is rotationally fitted with the outer surface of the static ring, and the dynamic ring and the static ring are made of different materials.

[0041] Specifically, since the two ends of the ring chain roll in contact with the two ends of the friction pair test shaft, the friction pair test system is also set at the two ends of the friction pair test shaft, and the dynamic ring and static ring in the test system are fixedly connected to the ring chain and the friction pair test shaft respectively, so that the dynamic ring and static ring become part of the structure of the ring chain and the friction pair test shaft respectively, and the wear condition between the chain and the rotating shaft is obtained. The dynamic ring and static ring are tested with different materials to finally find out which two materials have the longest wear life and the wear limit cycle of each group of two materials. In this way, it can be determined what material to use on the inside of the chain and the outside of the rotating shaft. When the scraper is about to reach the wear limit, the equipment can be maintained and serviced in time.

[0042] In one embodiment, the material of the dynamic ring may be nylon or polyoxymethylene, and the material of the static ring may be a metal material with relatively high hardness, such as cemented carbide.

[0043] Optionally, the load system includes a pulley group and a counterweight group, the pulley group includes multiple fixed pulleys and movable pulleys, and traction ropes are wound around the fixed pulleys and the movable pulleys. One end of the traction rope is connected to the counterweight group, and the other end of the traction rope is connected to the load connecting shaft. The traction rope drives the load connecting shaft to be squeezed at the fitting point with the ring chain.

[0044] Optionally, the counterweight group includes a connecting pin and a plurality of counterweight blocks, the top end of the connecting pin is connected to one end of the traction rope, and the counterweight block is detachably connected to the connecting pin.

[0045] Specifically, a pulley group and a counterweight group are arranged in the load system, and traction ropes are wound around multiple fixed pulleys and movable pulleys. This can not only change the transmission direction of the force of the counterweight block, but also amplify the load force in a limited space, and change the force direction of the counterweight block moving up and down into a horizontal force acting on the load connecting shaft. In this way, the annular chain can be squeezed and pulled through the load connecting shaft, thereby changing the squeezing force between the load connecting shaft and the annular chain, and the rotational resistance of the annular chain will change. This is the same as the operating state of the annular chain driving the scraper blade to push the precipitated sludge.

[0046] In one embodiment, the coordinated use of the pulley group and the counterweight group in the load system can change the effect of the contact pressure between the friction pairs by adjusting the number of counterweight blocks. The pulley group ratio can amplify the counterweight tension value, so that the test tension value of the ring chain is consistent with the actual working conditions.

[0047] Optionally, a process simulation system is also included, which includes a circulation pump, a suspended matter concentration sensor and a sand content meter. The circulation pump is arranged on the water inlet pipe of the sewage tank, and the suspended matter concentration sensor and the sand content meter are also arranged on the water inlet pipe.

[0048] Specifically, the host system is also connected to the process simulation system. When it is necessary to test the friction pairs of dynamic rings and static rings made of different materials, it is necessary to inject sewage into the sewage tank and detect parameters such as the suspended matter concentration and sand concentration in the sewage. This can simulate different sewage qualities and simulate the operating environment of the static ring and dynamic ring.

[0049] The present invention also provides a non-metallic chain type scraper wear limit testing method, using the above-mentioned non-metallic chain type scraper wear limit testing device, the testing method comprises:

[0050] The dynamic ring and the static ring of different materials are installed on the friction pair test shaft, and the load system applies force to the load connection shaft;

[0051] Inject sewage into the main engine system, drive the ring chain to rotate through the main shaft, and obtain the optimal friction pair of the friction pair test system.

[0052] Specifically, when the test device conducts wear limit tests on different materials, the dynamic ring and static ring of the test material are installed between the friction pair test shaft and the ring chain, and sewage with required parameters is injected into the sewage tank. In this way, the main shaft can be driven to rotate by the drive motor, and the main shaft rotates with the ring chain. During the rotation process, the load system applies resistance to the ring chain through the load connecting shaft. By continuously adjusting the parameters of the drive motor and the load system, the load P and the speed V can be adjusted. Under the condition of keeping the abrasive wear failure mechanism unchanged, the test cycle can be shortened to predict the wear life.

[0053] The "optimal friction pair" mentioned here is the friction pair with the smallest volume wear under the same test conditions.

[0054] Example

[0055] like Figures 1 to 3 As shown, the present invention provides a non-metallic chain scraper wear limit testing device, comprising:

[0056] The host system 1 includes four rotating shafts, including a main shaft 2, a friction pair test shaft 3, and a load connection shaft 4, all of which are sleeved on the main shaft 2, the friction pair test shaft 3, and the load connection shaft 4 through an annular chain 5;

[0057] The friction pair test system is arranged on the friction pair test shaft 3. The friction pair test system comprises a stationary ring 7 and a dynamic ring 8. The stationary ring 7 is sleeved on the friction pair test shaft 3. The dynamic ring 8 rotates synchronously with the ring chain 5. The dynamic ring 8 and the stationary ring 7 rotate and rub against each other.

[0058] The load system 9 is connected to the load connecting shaft 4 .

[0059] In this embodiment, the host system 1 includes a sewage tank 10, and the ring chain 5, the main shaft 2, the friction pair test shaft 3 and the load connecting shaft 4 are arranged in the sewage tank 10. A drive motor 11 is arranged above the sewage tank 10, and the drive motor 11 is connected to the main shaft 2.

[0060] In this embodiment, the driving motor 11 is drivingly connected to the middle of the main shaft 2 through a transmission belt, and both ends of the main shaft 2 are drivingly connected to the ring chain 5 through driving wheels.

[0061] In this embodiment, the friction pair testing systems are respectively arranged at two ends of the friction pair testing shaft 3 .

[0062] In this embodiment, the driving motor 11 is a variable frequency motor.

[0063] In this embodiment, the inner surface of the dynamic ring 8 is rotatably fitted with the outer surface of the static ring 7 , and the dynamic ring 8 and the static ring 7 are made of different materials.

[0064] In this embodiment, the load system 9 includes a pulley group and a counterweight group. The pulley group includes six fixed pulleys 12 and one movable pulley 13. A traction rope 14 is wound around the fixed pulley 12 and the movable pulley 13. One end of the traction rope 14 is connected to the counterweight group, and the other end of the traction rope 14 is connected to the load connecting shaft 4. The traction rope 14 drives the load connecting shaft 4 to be squeezed toward the fitting position with the ring chain 5.

[0065] In this embodiment, the counterweight group includes a connecting pin 15 and a plurality of counterweight blocks 16. The top end of the connecting pin 15 is connected to one end of the traction rope 14, and the counterweight block 16 is detachably connected to the connecting pin 15.

[0066] In this embodiment, a process simulation system 6 is also included, which includes a circulation pump 17, a suspended matter concentration sensor and a sand content meter. The circulation pump 17 is arranged on the water inlet pipe of the sewage tank 10, and the suspended matter concentration sensor and the sand content meter are also arranged on the water inlet pipe.

[0067] The present invention also provides a non-metallic chain type scraper wear limit testing method, using the above-mentioned non-metallic chain type scraper wear limit testing device, the testing method comprises:

[0068] The dynamic ring 8 and the static ring 7 made of different materials are mounted on the friction pair test shaft 3, and the load system 9 applies a force to the load connection shaft 4;

[0069] Sewage is injected into the main engine system 1, and the ring chain 5 is driven to rotate through the main shaft 2 to obtain the optimal friction pair of the friction pair test system.

[0070] In summary, the test device is designed to ensure the similarity and equivalence of the wear form under accelerated conditions and normal conditions, and to avoid thermal melting failure that changes the original wear form. The entire test system is completed underwater. In order to form the test conditions for abrasive wear, gravel is added to the water pool to form the same water quality as the actual working conditions.

[0071] The tests are divided into wear equivalence test, friction pair comparison test and wear life prediction.

[0072] The purpose of the accelerated wear test is to use a short-time test to achieve the equivalent wear amount achieved by long-term operation. The wear amount of a scraper running at full load for 6 months in a certain project is used as a reference value to design the acceleration coefficient C of the accelerated wear test device.

[0073]

[0074] The error between the wear results of the accelerated test and the actual operating wear is analyzed and found to be less than 5%, indicating that the accelerated limit test device is equivalent to the actual working conditions.

[0075] Friction pair comparison test:

[0076] For a variety of metal materials and non-metallic materials, dual friction pair design is carried out, and the test priority of the friction pair is obtained by arranging and combining them from large to small according to the hardness value. After the equivalent test, the accelerated wear test under the same conditions is carried out on the accelerated test device. According to the wear test results, the friction pair with the smallest volume wear is obtained as the optimal friction pair.

[0077] Wear life prediction test example:

[0078] Sliding wear occurs between the dynamic ring and the static ring. The PV value in normal operation is 5000N*0.01m / s=50N.m / s, and the cumulative sliding stroke in one day (24 hours) is 864m. The load is strengthened on the acceleration test platform, and the operating speed is increased by 15 times. Under the condition of unchanged loading force value, the PV value is increased to 5000*0.15=750N.m / s.

[0079] When the total sliding stroke of the test specimen reaches 77760m (144 hours), the wear depth of the specimen is measured and substituted into the life prediction formula: where the allowable wear depth of the sleeve is 3mm, the life cycle (days) of the friction pair is obtained.

[0080]

[0081] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A non-metallic chain scraper wear limit testing device, characterized in that: include: The host system comprises a main shaft, a friction pair test shaft, a load connection shaft and an annular chain, wherein the annular chain is sleeved on the main shaft, the friction pair test shaft and the load connection shaft; A friction pair test system is arranged on the friction pair test shaft, and the friction pair test system comprises a stationary ring and a dynamic ring, wherein the stationary ring is sleeved on the friction pair test shaft, the dynamic ring rotates synchronously with the annular chain, and the dynamic ring and the stationary ring rotate and rub against each other; A load system is connected with the load connecting shaft.

2. The wear limit testing device for non-metallic chain scraper according to claim 1 is characterized in that: The host system includes a sewage tank, the annular chain, the main shaft, the friction pair test shaft and the load connection shaft are arranged in the sewage tank, and a drive motor is arranged above the sewage tank, and the drive motor is connected to the main shaft.

3. The wear limit testing device for non-metallic chain scraper according to claim 2 is characterized in that: The driving motor is drivingly connected to the middle part of the main shaft through a transmission belt, and both ends of the main shaft are drivingly connected to the annular chain through driving wheels.

4. The wear limit testing device for non-metallic chain scraper according to claim 3 is characterized in that: The friction pair test systems are respectively arranged at two ends of the friction pair test shaft.

5. The wear limit testing device for non-metallic chain scraper according to claim 2, characterized in that: The driving motor is a variable frequency motor.

6. The wear limit testing device for non-metallic chain scraper according to claim 1, characterized in that: The inner surface of the dynamic ring is rotatably fitted with the outer surface of the static ring. The dynamic ring and the static ring are made of different materials. The dynamic ring is made of non-metallic material, and the static ring is made of metallic material.

7. The wear limit testing device for non-metallic chain scraper according to claim 1, characterized in that: The load system includes a pulley group and a counterweight group, the pulley group includes a plurality of fixed pulleys and a movable pulley, the fixed pulley and the movable pulley are both wound with a traction rope, one end of the traction rope is connected to the counterweight group, and the other end of the traction rope is connected to the load connecting shaft, and the traction rope drives the load connecting shaft to be squeezed toward the fitting point of the ring chain.

8. The wear limit testing device for non-metallic chain scraper according to claim 7, characterized in that: The counterweight group includes a connecting pin and a plurality of counterweight blocks, the top end of the connecting pin is connected to one end of the traction rope, and the counterweight block is detachably connected to the connecting pin.

9. The wear limit testing device for non-metallic chain scraper according to claim 2, characterized in that: It also includes a process simulation system, which includes a circulation pump, a suspended matter concentration sensor and a sand content meter. The circulation pump is arranged on the water inlet pipe of the sewage tank, and the suspended matter concentration sensor and the sand content meter are also arranged on the water inlet pipe.

10. A method for testing the wear limit of a non-metallic chain type scraper, using the wear limit testing device of a non-metallic chain type scraper according to any one of claims 1 to 9, characterized in that: The test method includes: The dynamic ring and the static ring made of different materials are mounted on the friction pair test shaft, and the load system applies a force to the load connection shaft; Sewage is injected into the main engine system, and the annular chain is driven to rotate by the main shaft to obtain the optimal friction pair of the friction pair testing system.

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