Device for detecting wear resistance of harvester blade

Abstract

The invention discloses a harvester blade wear resistance detection device, and belongs to the technical field of material performance testing, the harvester blade wear resistance detection device comprises a workbench, and the top wall of the workbench is fixedly provided with a support; and the grinding mechanism comprises a sliding groove formed in the support, a mounting block is slidably mounted in the sliding groove, and a motor is fixedly mounted on the side wall of the mounting block. According to the scheme, the reciprocating screw rod is arranged, then the motor is powered on and drives the reciprocating screw rod to rotate, the mounting plate is in threaded fit with the reciprocating screw rod, the mounting plate cannot rotate under the action of the limiting rod, and then the mounting plate drives the grinding block to horizontally move in the rotating process of the reciprocating screw rod; due to the fact that the blade is subjected to sliding friction in the crop cutting process in the working process, the reciprocating lead screw is arranged to drive the grinding block to move back and forth to grind the blade, stress of the blade in the working process can be simulated, and the effect of improving the abrasion resistance inspection precision is achieved.

Description

Technical Field

[0001] This invention relates to the field of material performance testing technology, and more specifically, to a device for testing the wear resistance of harvester blades. Background Technology

[0002] Harvester blades are the main working components of a harvester. They cut crops by the oscillation of the rotating cutter head. During the operation of the machine and the movement of objects, friction and wear inevitably occur between materials in contact. Under normal circumstances, friction and wear between materials can lead to deformation, affecting their service life and consequently impacting the normal operation of the machine or the proper use of components. Wear is a significant cause of material and energy loss. Wear issues are widespread, therefore, many fields require the detection of wear caused by the working environment of materials and engineering research on the wear resistance of materials. The purpose is to address wear issues in product manufacturing and production processes and to study technological measures and methods to prevent or reduce wear.

[0003] The current common testing method is to test the hardness of the blade material. The higher the hardness, the better the wear resistance. However, this testing method cannot accurately reflect the wear resistance of the blade in actual use.

[0004] Chinese patent CN207717559U discloses a wear resistance testing device. The device uses the rotation of a motor to drive the rotation of a tool holder support rod mounted on a connecting rod. After the tool holder support rod rotates, the blade mounted on the tool holder rubs against the whetstone. The device measures the wear length of the blade within a specific time period, thereby more accurately reflecting the wear of the blade.

[0005] Chinese Patent No. CN219245277U discloses a device for testing the wear resistance of metal decorative materials. The device is equipped with an electric cylinder, a mounting box, a pressure sensor, a pressure-sensitive spring, a mounting sleeve, a servo motor, and a grinding disc. It can be used in conjunction with these components to conveniently test the wear resistance of metal objects without the need for manual addition of weights to increase the gravity during testing. The device is easy to operate, has a relatively high degree of automation, and can effectively improve the testing accuracy.

[0006] Most existing wear resistance testing devices grind the device under test by rotating a grinding disc. However, the friction force experienced by harvester blades during operation is not generated by the rotation of external objects, but by the friction force experienced by the blades during the horizontal cutting of crops. In order to accurately detect the wear resistance of the blades during operation, it is necessary to apply a horizontal sliding friction force to the blades for wear resistance testing. Summary of the Invention

[0007] To address the problems existing in the prior art, the purpose of this invention is to provide a device for testing the wear resistance of harvester blades, which can improve the testing effect.

[0008] To solve the above problems, the present invention adopts the following technical solution.

[0009] A device for testing the wear resistance of harvester blades includes a workbench, on which a bracket is fixedly installed;

[0010] The grinding mechanism includes a slide groove on a bracket, a mounting block slidably installed in the slide groove, a motor fixedly installed on the side wall of the mounting block, a reciprocating screw rotatably installed on the mounting block and fixedly connected to the output end of the motor, a mounting plate threaded onto the reciprocating screw, a grinding block detachably installed on the bottom wall of the mounting plate, and a limiting rod that slides with the mounting plate fixedly installed between the two mounting blocks. The motor drives the grinding block to move back and forth through the reciprocating screw and the mounting plate to grind the blade.

[0011] The control mechanism includes an electric telescopic rod symmetrically fixedly installed on the top wall of the bracket. A spring telescopic rod is fixedly installed on the output end of the electric telescopic rod, and the output end of the spring telescopic rod is fixedly connected to the mounting block. The output end of the electric telescopic rod drives the grinding block to press tightly against the blade surface through the spring telescopic rod and the slider.

[0012] Furthermore, a collection tank is provided on the workbench, and waste outlets are evenly provided on the top wall of the collection tank. A water cavity is provided in the space below the collection tank on the workbench, and the water cavity is filled with clean water. A collection pipe extending to the bottom wall of the collection tank is inserted.

[0013] Furthermore, a first telescopic tube that cooperates with a reciprocating screw is symmetrically fixed between the side wall of the mounting block and the mounting plate. A first air inlet valve is inserted into each of the two mounting blocks. An air inlet pipe extending into the collection tank is fixedly installed on the input end of the first air inlet valve, and the end of the air inlet pipe away from the first air inlet valve is located above the liquid surface.

[0014] Furthermore, an air groove is provided on the mounting plate, and an exhaust port that cooperates with the grinding block is provided on the bottom wall of the air groove. A first exhaust valve with an output end extending into the air groove is symmetrically inserted on the side wall of the mounting block, and the input end of the first exhaust valve is connected to the first telescopic tube.

[0015] The debris on the surface is separated from the blade, making it easier for the user to observe the polishing process on the blade surface in real time.

[0016] Furthermore, an elastic telescopic tube is fixedly installed on the bottom wall of the bracket, a fixing rod is fixedly installed on the bottom wall of the elastic telescopic tube, and a magnet electrically connected to the motor is embedded in the bracket.

[0017] Furthermore, a vertical groove is provided on the fixed rod, a vertical rod is slidably installed in the vertical groove, an elastic airbag is fixedly installed between the vertical rod and the bottom wall of the vertical groove, a linkage groove is provided on the vertical rod, and a connecting pipe communicating with the linkage groove is inserted into the side wall of the elastic airbag.

[0018] Furthermore, a water cylinder is fixedly installed inside the water cavity, and a piston plate is slidably installed inside the water cylinder. The piston plate has a water inlet on the side wall of the water cylinder, and a drain pipe connected to the air groove is inserted into the top wall of the water cylinder. A connecting rod that cooperates with the mounting block is fixedly installed on the top wall of the piston plate, and a first spring is fixedly installed between the bottom wall of the piston plate and the water cylinder.

[0019] Furthermore, a filter screen is embedded in the water inlet, a pneumatic telescopic rod is fixedly installed on the top wall of the water chamber, a cleaning brush that cooperates with the filter screen is fixedly installed on the output end of the pneumatic telescopic rod, and a first air pipe connected to the input end of the pneumatic telescopic rod is inserted into the elastic telescopic tube.

[0020] Furthermore, an impeller is rotatably mounted on the inner wall of the collecting pipe.

[0021] Furthermore, the bottom wall of the collection tank is conical to fit the collection pipe.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0023] (1) This solution uses a reciprocating lead screw. The motor is energized and drives the lead screw to rotate. Because the mounting plate is threaded onto the lead screw and cannot rotate under the action of the limit rod, the grinding block moves horizontally via the mounting plate during the rotation of the lead screw. Compared to traditional blade wear resistance testing, since the blade experiences sliding friction during crop cutting, the reciprocating lead screw drives the grinding block to move back and forth to grind the blade. This simulates the force experienced by the blade during operation, thus improving the accuracy of wear resistance testing.

[0024] (2) This solution incorporates a first telescopic tube. During the movement of the mounting plate, the first telescopic tube on the side opposite to the direction of movement is stretched. The stretched first telescopic tube then draws air from the water chamber through the first air inlet valve and air inlet pipe. The air pressure in the collection tank decreases, and air is drawn in through the collection pipe, collection tank, and waste port. As the airflow enters the water chamber through the waste port, collection tank, and collection pipe, it carries the grinding debris generated during the grinding process into the water chamber. This effectively prevents the debris from scattering everywhere, which would require users to spend a lot of time cleaning up the debris. It also prevents the debris from being inhaled by the testing personnel and affecting their health. Furthermore, by drawing the grinding debris into the water chamber, it also prevents the debris from remaining on the blade surface and affecting the testing personnel's real-time recording and observation of the grinding process. This facilitates the testing personnel's real-time monitoring and observation of the testing data.

[0025] (3) This solution creates an air groove. During the movement of the mounting plate, the first telescopic tube on the same side as the moving direction of the mounting plate is compressed. Then, the gas in the compressed first telescopic tube is blown onto the blade surface through the first exhaust valve, air groove, and exhaust port, causing the debris on the blade surface to detach from the blade. This makes it easier for the user to observe the grinding status of the blade surface in real time.

[0026] (4) This solution uses a vertical rod. As the fixed rod moves downward, it gradually contacts the blade and applies a pushing force to it. Then, under the action of the pushing force, the vertical rod moves upward. During this upward movement, the elastic airbag is stretched and draws air through the connecting pipe and the linkage groove. Since the bottom wall of the vertical rod is in close contact with the blade at this time, external airflow enters the elastic airbag through the linkage groove and the connecting pipe. Then, under the suction force of the elastic airbag, the vertical rod and the blade are tightly attracted together, further improving the blade fixing effect.

[0027] (5) This solution incorporates a first telescopic tube. When grinding is complete and the electric telescopic rod moves the mounting block upwards, the first spring extends and moves the piston plate upwards. After the piston plate passes the water inlet, the water in the water tank flows through the drain pipe into the air groove and is sprayed onto the blade surface through the exhaust port. In other words, after grinding, the mounting plate moves while simultaneously spraying water onto the blade surface. Under the action of the water flow, residual impurities on the blade surface detach from the blade, making it easier for inspectors to observe the degree of grinding. Simultaneously, spraying water onto the blade accelerates its cooling, facilitating further inspection and thus improving inspection efficiency.

[0028] (6) This solution uses a pneumatic telescopic rod. During the extension of the elastic telescopic tube, air is drawn from the pneumatic telescopic rod through the first air pipe. Then, the output end of the pneumatic telescopic rod retracts and drives the cleaning brush to move. During the retraction of the elastic telescopic tube, the gas in the elastic telescopic tube flows to the pneumatic telescopic rod through the first air pipe and causes the output end of the pneumatic telescopic rod to extend. During the extension of the output end of the pneumatic telescopic rod, the cleaning brush moves again. During the movement of the cleaning brush, the dirt attached to the filter screen can be aired, thereby effectively preventing the dirt from affecting the normal water flow into the water tank and ensuring that the water flows normally through the filter screen. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of the present invention;

[0030] Figure 2 This is a cross-sectional view of the present invention;

[0031] Figure 3 For the present invention Figure 2 Enlarged view of point A in the middle;

[0032] Figure 4 For the present invention Figure 2 Enlarged view at point B in the middle;

[0033] Figure 5 This is a combined sectional view of the mounting plate and air groove of the present invention;

[0034] Figure 6 This is a combined diagram of the coil, elastic telescopic tube, fixing rod, and vertical rod of the present invention;

[0035] Figure 7 This is a diagram showing the combination of the collection tube and impeller of the present invention.

[0036] Explanation of the labels in the diagram:

[0037] 1. Workbench; 2. Support; 3. Mounting block; 4. Motor; 5. Reciprocating screw; 6. Mounting plate; 7. Grinding block; 8. Limiting rod; 9. Electric telescopic rod; 10. Spring telescopic rod; 11. Collection tank; 12. Water chamber; 13. Collection pipe; 14. First telescopic tube; 15. First air inlet valve; 16. Air inlet pipe; 17. Air tank; 18. Exhaust port; 19. First exhaust valve; 20. Elastic telescopic tube; 21. Fixing rod; 22. Magnet; 23. Vertical rod; 24. Elastic air bladder; 25. Connecting pipe; 26. Linkage groove; 27. Water cylinder; 28. Drain pipe; 29. ​​Connecting rod; 30. Piston plate; 31. First spring; 32. Filter screen; 33. Pneumatic telescopic rod; 34. Cleaning brush; 35. First air pipe; 36. Impeller. Detailed Implementation

[0038] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0039] Please see Figures 1 to 7 A device for testing the wear resistance of harvester blades includes a workbench 1, and a bracket 2 is fixedly installed on the top wall of the workbench 1.

[0040] The grinding mechanism includes a slide groove on the bracket 2, a mounting block 3 slidably installed in the slide groove, a motor 4 fixedly installed on the side wall of the mounting block 3, a reciprocating screw 5 rotatably installed on the mounting block 3 and fixedly connected to the output end of the motor 4, a mounting plate 6 threadedly installed on the reciprocating screw 5, a grinding block 7 detachably installed on the bottom wall of the mounting plate 6, and a limiting rod 8 that slides with the mounting plate 6 fixedly installed between the two mounting blocks 3. The motor 4 drives the grinding block 7 to move back and forth through the reciprocating screw 5 and the mounting plate 6 to grind the blade.

[0041] The control mechanism includes an electric telescopic rod 9 symmetrically fixedly installed on the top wall of the bracket 2. A spring telescopic rod 10 is fixedly installed on the output end of the electric telescopic rod 9, and the output end of the spring telescopic rod 10 is fixedly connected to the mounting block 3. The output end of the electric telescopic rod 9 drives the grinding block 7 to press tightly against the blade surface through the spring telescopic rod 10 and the slider.

[0042] A collection tank 11 is provided on the workbench 1. Waste outlets are evenly provided on the top wall of the collection tank 11. A water cavity 12 is provided in the space below the collection tank 11 on the workbench 1, and the water cavity 12 is filled with clean water. A collection pipe 13 extending to the bottom wall of the collection tank 11 is inserted.

[0043] The side wall of the mounting block 3 and the mounting plate 6 are symmetrically fixed with a first telescopic tube 14 that cooperates with the reciprocating screw 5. A first air inlet valve 15 is inserted on both mounting blocks 3. An air inlet pipe 16 extending into the collection tank 11 is fixedly installed on the input end of the first air inlet valve 15, and the end of the air inlet pipe 16 away from the first air inlet valve 15 is located above the liquid surface.

[0044] The mounting plate 6 has an air groove 17, and the bottom wall of the air groove 17 has an exhaust port 18 that cooperates with the grinding block 7. The side wall of the mounting block 3 is symmetrically equipped with a first exhaust valve 19 whose output end extends into the air groove 17, and the input end of the first exhaust valve 19 is connected to the first telescopic tube 14.

[0045] Wear resistance is related to almost all material properties, and different wear mechanisms require different material properties to improve wear resistance. Due to the varying friction materials and test conditions, wear resistance can be expressed using the wear index or as the material loss (g / cm²) measured by a wear testing machine under specified conditions, or its reciprocal. Wear resistance is a measurement parameter in friction and wear testing. The wear resistance of a material is often expressed as the wear rate G, calculated using the formula: G = (m1 - m2) / A

[0046] In the formula:

[0047] G—Wear rate of the material, g / cm2;

[0048] m1, m2 — Mass loss of material before and after wear, in grams;

[0049] A – Abrasion area of ​​the material specimen, cm2.

[0050] The lower the wear rate G value of a material, the better its wear resistance. [2]

[0051] In addition, the concept of relative abrasion resistance is widely used, and relative abrasion resistance is expressed by the following formula.

[0052] &=M1 / M2

[0053] In the formula:

[0054] &——Relative abrasion resistance;

[0055] M1 – Wear amount of standard pattern;

[0056] M2 – Wear amount of the test sample.

[0057] The coefficient of relative wear resistance is also called the wear coefficient.

[0058] In use, the blade is placed on the surface of the workbench 1, and then the motor 4 is powered on to drive the reciprocating screw 5 to rotate. Since the mounting plate 6 is threadedly engaged with the reciprocating screw 5, and the mounting plate 6 cannot rotate under the action of the limit rod 8, the grinding block 7 moves horizontally through the mounting plate 6 during the rotation of the reciprocating screw 5. At the same time, the output end of the electric telescopic rod 9 extends and drives the mounting block 3 downward through the spring telescopic rod 10. During the downward movement of the mounting block 3, the grinding block 7 gradually contacts the blade through the reciprocating screw 5 and grinds the blade. Compared with the traditional blade wear resistance test, since the blade is subjected to sliding friction during the cutting of crops, the reciprocating screw 5 drives the grinding block 7 to move back and forth to grind the blade, which can simulate the force of the blade during the working process, thus improving the accuracy of wear resistance test; and the horizontal grinding makes it easier for the tester to observe the grinding situation.

[0059] During the extension of the output end of the electric telescopic rod 9, the output end of the spring telescopic rod 10 is compressed and gradually extends with the depth of grinding. That is, during the grinding process, the grinding block 7 is always in close contact with the blade, which improves the efficiency of inspection.

[0060] During the process of the reciprocating screw 5 driving the mounting plate 6 to move, the first telescopic tube 14 can isolate the reciprocating screw 5 from the outside world, thereby effectively preventing the accumulation of external dirt on the surface of the reciprocating screw 5 from affecting the movement of the mounting plate 6, and ensuring the normal movement of the mounting plate 6.

[0061] During the movement of the mounting plate 6, the first telescopic tube 14 on the side opposite to the direction of movement of the mounting plate 6 is stretched. Then, the stretched first telescopic tube 14 draws air from the water chamber 12 through the first air inlet valve 15 and the air inlet pipe 16. Then, the air pressure in the collection tank 11 decreases and air is drawn in through the collection pipe 13, the collection tank 11, and the waste port. Then, as the airflow enters the water chamber 12 through the waste port, the collection tank 11, and the collection pipe 13, it carries the debris generated during the grinding process into the water chamber 12. This effectively prevents the debris from flying everywhere, which would require the user to spend a lot of time cleaning up the debris. It also prevents the debris from being inhaled by the testing personnel and affecting their health. At the same time, by drawing the grinding debris into the water chamber 12, it also prevents the debris from remaining on the blade surface and affecting the testing personnel's real-time recording and observation of the grinding situation. This facilitates the testing personnel to observe and detect the test data in real time.

[0062] By storing clean water in the water chamber 12, debris can be prevented from spreading back into the cavity. Furthermore, by combining the debris with water, it can be prevented from scattering again and being inhaled by the personnel when they process the collected debris, thus improving safety.

[0063] During the movement of the mounting plate 6, the first telescopic tube 14 on the same side as the moving direction of the mounting plate 6 is compressed. Then, the gas in the compressed first telescopic tube 14 is blown onto the blade surface through the first exhaust valve 19, the air groove 17, and the exhaust port 18, causing the debris on the blade surface to detach from the blade, thus making it easier for the user to observe the grinding status of the blade surface in real time.

[0064] like Figure 6 As shown, an elastic telescopic tube 20 is fixedly installed on the bottom wall of the bracket 2, and a fixing rod 21 is fixedly installed on the bottom wall of the elastic telescopic tube 20. A magnet 22 electrically connected to the motor 4 is embedded in the bracket 2.

[0065] A vertical groove is provided on the fixed rod 21, and a vertical rod 23 is slidably installed in the vertical groove. An elastic airbag 24 is fixedly installed between the vertical rod 23 and the bottom wall of the vertical groove. A linkage groove 26 is provided on the vertical rod 23, and a connecting pipe 25 communicating with the linkage groove 26 is inserted into the side wall of the elastic airbag 24.

[0066] By adopting the above technical solution, the coil is energized and generates a magnetic field during the operation of the motor 4. Then, under the action of the magnetic field, the magnet 22 drives the fixing rod 21 to move downward and fix the blade. At this time, the elastic telescopic tube 20 is stretched and has a tendency to recover, thereby effectively preventing the blade from moving during the grinding process and affecting the blade detection effect, thus improving the detection effect.

[0067] As the fixed rod 21 moves downward, it causes the vertical rod 23 to gradually come into contact with the blade and apply a pushing force to the blade. Then, under the action of the pushing force, the vertical rod 23 moves upward. During the upward movement of the vertical rod 23, the elastic airbag 24 is stretched and draws air through the connecting pipe 25 and the linkage groove 26. Since the bottom wall of the vertical rod 23 is in close contact with the blade at this time, the external airflow enters the elastic airbag 24 through the linkage groove 26 and the connecting pipe 25. Then, under the suction of the elastic airbag 24, the vertical rod 23 and the blade are tightly attracted together, which further improves the fixing effect of the blade.

[0068] After the test is completed, the motor 4 stops working. At this time, the electromagnetic field of the coil disappears, and then the elastic telescopic tube 20 retracts and drives the fixed rod 21 to move upward. At the same time, the elastic airbag 24 retracts, and the fixing effect is automatically released, making it easier for the tester to remove the blade for the next test, thus improving the test effect.

[0069] like Figure 2 , Figure 3 , Figure 4 , Figure 5 As shown, a water cylinder 27 is fixedly installed inside the water cavity 12, and a piston plate 30 is slidably installed inside the water cylinder 27. A water inlet is opened on the side wall of the piston plate 30 and a drain pipe 28 connected to the air groove 17 is inserted into the top wall of the water cylinder 27. A connecting rod 29 that cooperates with the mounting block 3 is fixedly installed on the top wall of the piston plate 30. A first spring 31 is fixedly installed between the bottom wall of the piston plate 30 and the water cylinder 27.

[0070] A filter screen 32 is embedded in the water inlet, a pneumatic telescopic rod 33 is fixedly installed on the top wall of the water chamber 12, a cleaning brush 34 that cooperates with the filter screen 32 is fixedly installed on the output end of the pneumatic telescopic rod 33, and a first air pipe 35 that is connected to the input end of the pneumatic telescopic rod 33 is inserted into the elastic telescopic tube 20.

[0071] By adopting the above technical solution, during the downward movement of the mounting block 3, the piston plate 30 is driven to move downward through the connecting rod 29. At this time, the first spring 31 is compressed and has a tendency to recover. During the downward movement of the piston plate 30, the pressure in the space above the piston plate 30 in the water cylinder 27 decreases. Then, when the piston plate 30 passes the water inlet, the space above the piston plate 30 in the water cylinder 27 draws water from the water chamber 12 through the water inlet. Then, when the grinding is finished and the electric telescopic rod 9 drives the mounting block 3 to move upward, the first spring 31 extends and drives the piston plate 30 to move upward. When the piston plate 30 passes the water inlet, the water in the water cylinder 27 flows into the air groove 17 through the drain pipe 28 and is sprayed onto the blade surface through the exhaust port 18. That is, after the grinding is finished, the mounting plate 6 moves while spraying water onto the blade surface. Then, under the action of the water flow, the impurities remaining on the blade surface are separated from the blade, which makes it easier for the inspector to observe the degree of grinding. At the same time, spraying water onto the blade can accelerate the cooling of the blade, which makes it easier for the inspector to carry out the next step of inspection, thus improving the inspection efficiency.

[0072] As water in the water chamber 12 flows from the inlet to the water cylinder 27, the filter screen 32 prevents impurities from entering the water cylinder 27 and affecting the normal movement of the piston plate 30. Then, as the elastic telescopic tube 20 extends, air is drawn from the pneumatic telescopic rod 33 through the first air pipe 35. The output end of the pneumatic telescopic rod 33 then retracts, driving the cleaning brush 34 to move. During the retraction of the elastic telescopic tube 20, the gas inside flows through the first air pipe 35 to the pneumatic telescopic rod 33, causing its output end to extend. This extension of the pneumatic telescopic rod 33 again drives the cleaning brush 34 to move. The movement of the cleaning brush 34 removes dirt adhering to the surface of the filter screen 32, effectively preventing dirt from affecting the normal water flow into the water cylinder 27, thus ensuring the normal passage of water through the filter screen 32.

[0073] like Figure 7 As shown, an impeller 36 is rotatably mounted on the inner wall of the collecting pipe 13.

[0074] By adopting the above technical solution, during the process of the airflow from the collection pipe 13 to the water chamber 12, the airflow will impact the impeller 36 and drive the impeller 36 to rotate. During the rotation of the impeller 36, the airflow can be dispersed, thereby increasing the residence time of the airflow in the water. At the same time, the water flow can be stirred during the rotation of the impeller 36, which plays a role in ensuring that impurities in the airflow are filtered by the water.

[0075] like Figure 2 As shown, the bottom wall of the collection tank 11 is conical and fits into the collection tube 13.

[0076] By adopting the above technical solution, during the process of impurities entering the water cavity 12 through the collection tank 11 and the collection pipe 13, by setting the bottom wall of the collection tank 11 to be conical and matching the collection pipe 13, under the action of gravity, some large particles of impurities enter the collection pipe 13 along the bottom wall of the collection tank 11 and enter the water cavity 12 through the collection pipe 13, which plays the role of ensuring that impurities enter the water cavity 12 normally.

[0077] Instructions for use: Place the blade on the workbench 1, then power on the motor 4 and drive the reciprocating screw 5 to rotate. Since the mounting plate 6 is threadedly engaged with the reciprocating screw 5, and the mounting plate 6 cannot rotate under the action of the limit rod 8, the grinding block 7 moves horizontally via the mounting plate 6 during the rotation of the reciprocating screw 5. Simultaneously, the output end of the electric telescopic rod 9 extends and drives the mounting block 3 downwards via the spring telescopic rod 10. During the downward movement of the mounting block 3, the grinding block 7 gradually contacts the blade via the reciprocating screw 5 and grinds the blade. Then, the stretched first telescopic tube 14 draws air from the water chamber 12 through the first air inlet valve 15 and air inlet pipe 16. The air pressure in the collection tank 11 decreases and passes through the collection pipe 13, collection tank 11, and waste... Air is drawn in through the feed inlet, and as the airflow passes through the waste inlet, collection trough 11, and collection pipe 13 into the water chamber 12, it carries the debris generated during the grinding process into the water chamber 12 as well. During the operation of the motor 4, the coil is energized and generates a magnetic field. Under the action of the magnetic field, the magnet 22 drives the fixing rod 21 to move downward and fix the blade. Then, under the action of the thrust, the vertical rod 23 moves upward. During the upward movement of the vertical rod 23, the elastic airbag 24 is stretched and draws in air through the connecting pipe 25 and the linkage groove 26. Since the bottom wall of the vertical rod 23 is in close contact with the blade at this time, the external airflow enters the elastic airbag 24 through the linkage groove 26 and the connecting pipe 25. Then, under the suction force of the elastic airbag 24, the vertical rod 23 and the blade are tightly attracted together.

[0078] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and its improved concepts, should be covered within the scope of protection of the present invention.

Claims

1. A device for testing the wear resistance of harvester blades, characterized in that, Includes: a workbench (1), on the top wall of the workbench (1) a bracket (2) is fixedly installed; The grinding mechanism includes a groove on a bracket (2), a mounting block (3) is slidably installed in the groove, a motor (4) is fixedly installed on the side wall of the mounting block (3), a reciprocating screw (5) fixedly connected to the output end of the motor (4) is rotatably installed on the mounting block (3), a mounting plate (6) is threaded on the reciprocating screw (5), a grinding block (7) is detachably installed on the bottom wall of the mounting plate (6), and a limiting rod (8) that slides with the mounting plate (6) is fixedly installed between the two mounting blocks (3). The motor (4) drives the grinding block (7) to move back and forth and grind the blade through the reciprocating screw (5) and the mounting plate (6). The control mechanism includes an electric telescopic rod (9) symmetrically fixedly installed on the top wall of the bracket (2). A spring telescopic rod (10) is fixedly installed on the output end of the electric telescopic rod (9), and the output end of the spring telescopic rod (10) is fixedly connected to the mounting block (3). The output end of the electric telescopic rod (9) drives the grinding block (7) to press tightly against the blade surface through the spring telescopic rod (10) and the slider.

2. The harvester blade wear resistance testing device according to claim 1, characterized in that: The workbench (1) is provided with a collection tank (11), and waste outlets are evenly provided on the top wall of the collection tank (11). A water cavity (12) is provided in the space below the collection tank (11) on the workbench (1), and the water cavity (12) is filled with clean water. A collection pipe (13) extending to the bottom wall of the collection tank (11) is inserted.

3. The harvester blade wear resistance testing device according to claim 2, characterized in that: The sidewall of the mounting block (3) and the mounting plate (6) are symmetrically fixed with a first telescopic tube (14) that cooperates with the reciprocating screw (5). A first air inlet valve (15) is inserted on both mounting blocks (3). An air inlet pipe (16) extending into the collection tank (11) is fixedly installed on the input end of the first air inlet valve (15), and the end of the air inlet pipe (16) away from the first air inlet valve (15) is located above the liquid surface.

4. The harvester blade wear resistance testing device according to claim 3, characterized in that: The mounting plate (6) has an air groove (17) and an exhaust port (18) that cooperates with the grinding block (7) is provided on the bottom wall of the air groove (17). The mounting block (3) has a first exhaust valve (19) with its output end extending into the air groove (17) symmetrically inserted on its side wall. The input end of the first exhaust valve (19) is connected to the first telescopic pipe (14).

5. The harvester blade wear resistance testing device according to claim 2, characterized in that: An elastic telescopic tube (20) is fixedly installed on the bottom wall of the bracket (2), and a fixing rod (21) is fixedly installed on the bottom wall of the elastic telescopic tube (20). A magnet (22) electrically connected to the motor (4) is embedded on the bracket (2).

6. The harvester blade wear resistance testing device according to claim 5, characterized in that: A vertical groove is provided on the fixed rod (21), and a vertical rod (23) is slidably installed in the vertical groove. An elastic airbag (24) is fixedly installed between the vertical rod (23) and the bottom wall of the vertical groove. A linkage groove (26) is provided on the vertical rod (23), and a connecting pipe (25) communicating with the linkage groove (26) is inserted into the side wall of the elastic airbag (24).

7. The harvester blade wear resistance testing device according to claim 5, characterized in that: A water cylinder (27) is fixedly installed inside the water cavity (12). A piston plate (30) is slidably installed inside the water cylinder (27). A water inlet is provided on the side wall of the piston plate (30). A drain pipe (28) communicating with the air groove (17) is inserted into the top wall of the water cylinder (27). A connecting rod (29) cooperating with the mounting block (3) is fixedly installed on the top wall of the piston plate (30). A first spring (31) is fixedly installed between the bottom wall of the piston plate (30) and the water cylinder (27).

8. The harvester blade wear resistance testing device according to claim 7, characterized in that: A filter screen (32) is embedded in the water inlet, a pneumatic telescopic rod (33) is fixedly installed on the top wall of the water cavity (12), a cleaning brush (34) that cooperates with the filter screen (32) is fixedly installed on the output end of the pneumatic telescopic rod (33), and a first air pipe (35) that is connected to the input end of the pneumatic telescopic rod (33) is inserted into the elastic telescopic tube (20).

9. The harvester blade wear resistance testing device according to claim 2, characterized in that: An impeller (36) is rotatably mounted on the inner wall of the collecting pipe (13).

10. The harvester blade wear resistance testing device according to claim 2, characterized in that: The bottom wall of the collection tank (11) is conical and fits into the collection pipe (13).

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