A friction and wear testing device for down-the-hole bits

Abstract

The utility model provides a kind of friction and abrasion testing device of down-the-hole drill, including test table, the top of test table is equipped with the U-shaped frame of opening downwards, U-shaped frame top is vertically equipped with lifting mechanism, the below of lifting mechanism is connected with support shaft rotation, support shaft surface is equipped with multiple key strips parallel with its axis, U-shaped frame inner middle part position is equipped with the first mounting seat coaxial with support shaft, rotatingly installed with installation pipe in the first mounting seat, installation pipe one end is driven and rotates by driving device, support shaft is movably placed in installation pipe, key groove matched with key strip is equipped in installation pipe. The utility model in use, hydraulic cylinder drives drill to be placed in rotary groove, drill rotates on friction plate with installation pipe rotation, the downward elongation of hydraulic cylinder can be controlled at this time, let there be certain pressure between drill and friction plate, so it can let drill rotate friction with friction plate with certain pressure, to observe the friction condition of drill.

Description

Technical Field

[0001] This utility model relates to the field of drill bit wear testing technology, specifically a down-the-hole drill bit friction and wear testing device. Background Technology

[0002] Down-the-hole (DH) drill bits are specialized tools used for drilling into rocks. They break rocks directly by impacting the bottom of the hole with a down-the-hole hammer, making them suitable for large-diameter, deep-hole drilling in medium-hard to extremely hard rock formations. Due to the demands of their working environment, DH drill bits require exceptional wear resistance and structural strength. Currently, different DH drill bit manufacturers use significantly different materials, heat treatment methods, and processing techniques, resulting in variations in their performance. Wear testing of DH drill bits is a crucial method for determining whether they meet the requirements of operating conditions.

[0003] For example, the down-the-hole drill bit friction and wear test device proposed in document number "CN206696114U" states in paragraph

[0025] of its specification that "when conducting the test, the cylinder 26 is activated, the piston rod of the cylinder 26 extends, and drives the down-the-hole drill bit 21 to move downward through the bearing seat 27, connecting shaft 29 and clamping sleeve 31. The front cutting teeth 35 of the down-the-hole drill bit 21 contact the upper surface of the grinding wheel 3, thus making the front cutting teeth 35 wear evenly." This process directly controls the cylinder 26 to drive the down-the-hole drill bit 21 to rub against the surface of the grinding wheel 3. The wear part is on the drill teeth of the drill bit, and the drill bit cannot be allowed to contact the grinding wheel 3 with high pressure, resulting in limited wear test results. Therefore, we propose a down-the-hole drill bit friction and wear test device. Utility Model Content

[0004] This invention provides a test device for friction and wear of down-the-hole drill bits, which has the advantage of allowing the drill bit to rotate and rub under a certain pressure, thus solving the problems mentioned in the background art.

[0005] The technical solution of this utility model is implemented as follows: A down-the-hole drill bit friction and wear test device is designed, including a test bench, a U-shaped frame with its opening facing downward is installed on the top of the test bench, a lifting mechanism is vertically installed on the top of the U-shaped frame, the lower part of the lifting mechanism is rotatably connected to a support shaft, the surface of the support shaft is provided with multiple keyways parallel to its axis, a first mounting seat coaxial with the support shaft is provided in the middle of the U-shaped frame, an mounting tube is rotatably installed in the first mounting seat, one end of the mounting tube is driven to rotate by a driving device, the support shaft is movably placed in the mounting tube, the mounting tube is provided with a keyway matching the keyways, the keyways are placed in the keyway, a down-the-hole drill bit is detachably installed at the bottom of the support shaft, a friction plate is provided below the support shaft, and a pressure sensor is placed below the friction plate.

[0006] Preferably, a connecting sleeve is coaxially provided at the bottom of the support shaft, and a tube shoe is threadedly connected to the bottom of the connecting sleeve, which is fitted onto the down-the-hole drill bit.

[0007] Preferably, a rotating groove is provided in the middle of the surface of the friction plate, and the rotating groove is located directly below the down-the-hole drill bit.

[0008] Preferably, the four corners of the friction plate are placed inside the L-shaped blocks, the L-shaped blocks are symmetrically arranged around the pressure sensor, and the pressure sensor and the L-shaped blocks are placed on the test bench.

[0009] Preferably, the lifting mechanism includes a hydraulic cylinder vertically mounted on the top of the U-shaped frame, the bottom of the hydraulic cylinder being connected to the U-shaped connecting frame, the U-shaped connecting frame having an opening facing downwards and a second mounting seat installed at its bottom, the second mounting seat being fitted onto the top of the support shaft and the two being rotatably connected.

[0010] Preferably, the drive device includes a first bevel gear coaxially disposed at one end of the mounting tube, one side of the first bevel gear meshing perpendicularly with a second bevel gear, the second bevel gear being mounted on a drive shaft, the drive shaft being rotatably mounted in a support, the support being disposed on a support platform, one side of the support platform being connected to a U-shaped frame, a drive motor being disposed below the support platform, the drive motor being mounted on a test bench, and pulleys being disposed on the shaft of the drive motor and at the end of the drive shaft away from the second bevel gear, the two pulleys being connected by a belt.

[0011] Preferably, the test bench is equipped with a control cabinet and a hydraulic station. The control cabinet contains a controller, and the hydraulic station is connected to the hydraulic cylinder via oil pipes. The surface of the control cabinet is equipped with a display screen and operation buttons. The display screen, operation buttons, hydraulic station, pressure sensor, and drive motor are electrically connected to the controller.

[0012] Preferably, protective covers are provided on the top of the support platform and on the side of the U-shaped frame away from the support platform, and the edges of the protective covers are detachably connected to the U-shaped frame, the support platform and the mounting frame respectively.

[0013] Preferably, the bottom sides of the support platform are connected to the test platform via brackets, and baffles are provided between the brackets.

[0014] Preferably, the two sides of the first mounting base are connected to the U-shaped frame through the mounting bracket.

[0015] Compared with the prior art, in use, the hydraulic cylinder drives the drill bit to be placed in the rotating groove. The drill bit rotates on the friction plate as the mounting tube rotates. At this time, the downward extension of the hydraulic cylinder can be controlled to create a certain pressure between the drill bit and the friction plate. This allows the drill bit to rotate and rub against the friction plate under a certain pressure, thereby allowing the friction of the drill bit to be observed. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the front structure of the present invention. Figure 1 .

[0018] Figure 2 This is a schematic diagram of the rear structure of this utility model.

[0019] Figure 3 This is a schematic diagram of the front structure of the present invention. Figure 2 .

[0020] Figure 4 This is the front view of the present utility model.

[0021] Figure 5 Schematic diagram of the structure of this utility model after the protective cover is installed. Figure 1 .

[0022] Figure 6 Schematic diagram of the structure of this utility model after the protective cover is installed. Figure 2 .

[0023] In the diagram: 1. Test bench; 2. L-shaped stop; 3. Friction plate; 4. Connecting sleeve; 5. U-shaped frame; 6. First mounting base; 7. First bevel gear; 8. Mounting tube; 9. Key strip; 10. Second mounting base; 11. Support shaft; 12. U-shaped connecting frame; 13. Hydraulic cylinder; 14. Control cabinet; 15. Support platform; 16. Mounting frame; 17. Baffle; 18. Rotary groove; 19. Pressure sensor; 20. Shoe; 21. Drive motor; 22. Second bevel gear; 23. Support; 24. Bracket; 25. Hydraulic station; 26. Drive shaft; 27. Protective cover. Detailed Implementation

[0024] The technical solution of this utility model will be clearly and completely described below with reference to its embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0025] Reference Figures 1 to 6This utility model provides a technical solution: a down-the-hole drill bit friction and wear testing device, including a test bench 1, with several support legs at the bottom of the test bench 1. A U-shaped frame 5 with its opening facing downwards is installed on the top of the test bench 1, and a lifting mechanism is vertically installed on the top of the U-shaped frame 5. Figure 1 As shown, the lifting mechanism specifically includes a hydraulic cylinder 13 vertically installed on the top of the U-shaped frame 5. The telescopic shaft of the hydraulic cylinder 13 is vertically downward, and the bottom of the hydraulic cylinder 13 is connected to the U-connecting frame 12. The opening of the U-connecting frame 12 faces downward, and a second mounting seat 10 is installed at the bottom inside the U-connecting frame 12. The lower part of the lifting mechanism is rotatably connected to the support shaft 11. Specifically, the second mounting seat 10 is fitted onto the top of the support shaft 11. The second mounting seat 10 and the support shaft 11 are rotatably connected, so that the support shaft 11 can rotate freely within the second mounting seat 10, but the support shaft 11 will not come out of the second mounting seat 10. A first mounting seat 6, coaxial with the support shaft 11, is located in the center of the U-shaped frame 5. The two sides of the first mounting seat 6 are connected to the U-shaped frame 5 via mounting brackets 16. A mounting tube 8 is rotatably mounted inside the first mounting seat 6, and the mounting tube 8 is coaxial with the support shaft 11. The surface of the support shaft 11 has multiple keyways 9 parallel to its axis, and the mounting tube 8 has keyways that match the keyways 9. Figure 1 As shown, the support shaft 11 is movably placed inside the mounting tube 8, and the key bar 9 is placed inside the keyway. In this way, the support shaft 11 can move along the axial direction of the mounting tube 8. Therefore, when the hydraulic cylinder 13 drives the support shaft 11 to move up and down, the support shaft 11 can move up and down inside the mounting tube 8, and the mounting tube 8 and the support shaft 11 can rotate inside the first mounting seat 6.

[0026] In actual use, the mounting tube 8 drives the support shaft 11 to rotate, so one end of the mounting tube 8 is driven to rotate by the drive device, such as... Figure 2 and Figure 4 As shown, the drive device includes a first bevel gear 7 coaxially mounted at one end of the mounting tube 8. Figure 1 The first bevel gear 7 is mounted on the top of the mounting tube 8. One side of the first bevel gear 7 meshes perpendicularly with the second bevel gear 22. The second bevel gear 22 is mounted on the drive shaft 26, and the drive shaft 26 is rotatably mounted in the support 23. Figure 2 As shown, the support 23 is mounted on the support platform 15, and one side of the support platform 15 is connected to the U-shaped frame 5. A drive motor 21 is provided below the support platform 15. The drive motor 21 is mounted on the test bench 1. Both the shaft of the drive motor 21 and the end of the drive shaft 26 away from the second bevel gear 22 are provided with pulleys, and the two pulleys are connected by a belt. The two belts can be designed with one large and one small to amplify the torque of the drive motor 21. Furthermore, the size of the second bevel gear 22 is smaller than that of the first bevel gear 7, further amplifying the motor's output torque. When the drive motor 21 rotates, it drives the drive shaft 26 via the belts and pulleys. The drive shaft 26 then drives the first bevel gear 7 via the second bevel gear 22, which in turn drives the mounting tube 8 to rotate. Ultimately, the mounting tube 8 drives the support shaft 11 to rotate. Because the support shaft 11 can move up and down within the mounting tube 8, it can both move up and down within the mounting tube 8 and rotate with the mounting tube 8.

[0027] Furthermore, the bottom of the support shaft 11 is detachably equipped with a down-the-hole drill bit. Specifically, the bottom of the support shaft 11 is coaxially equipped with a connecting sleeve 4. The support shaft 11 has a hollow structure and is connected to the inside of the connecting sleeve 4. The bottom of the connecting sleeve 4 is threaded with a tube shoe 20. The tube shoe 20 is fitted onto the down-the-hole drill bit. In reality, the down-the-hole drill bit is also installed in this way, that is, the tube shoe is placed on the down-the-hole drill bit, and then the tube shoe is connected to the drill rod (equivalent to the support shaft 11), which facilitates the replacement and installation of the drill bit.

[0028] Based on the above embodiments, when the hydraulic cylinder 13 rises and falls, it can drive the down-the-hole drill bit to rise and fall. Furthermore, the down-the-hole drill bit rotates with the mounting pipe 8. When the hydraulic cylinder 13 descends, it will drive the down-the-hole drill bit onto the test bench 1. To avoid direct contact between the test bench 1 and the down-the-hole drill bit, such as... Figure 1 As shown, a friction plate 3 is provided below the support shaft 11, and a pressure sensor 19 is placed below the friction plate 3. The pressure sensor 19 is a high-load sensor with a load-bearing capacity of at least 60 kPa. The specific operation process is as follows: a rotating groove 18 is provided in the middle of the surface of the friction plate 3. The rotating groove 18 is located directly below the down-the-hole drill bit. The hydraulic cylinder 13 drives the drill bit to be placed in the rotating groove 18 on the friction plate 3. The friction plate 3 is a steel plate or a wear-resistant alloy plate. The drill bit rotates on the friction plate 3 as the mounting tube 8 rotates. At this time, the downward extension of the hydraulic cylinder 13 can be controlled to create a certain pressure between the drill bit and the friction plate 3. This allows the drill bit to rotate and rub against the friction plate 3 under a certain pressure, thereby observing the friction of the drill bit. The force between the friction plate 3 and the drill bit is adjustable. For example, the pressure of the drill bit on the friction plate 3 is 3 tons and the rotation friction time is 30 minutes. Of course, the actual friction time and pressure can be set according to the actual situation. In this way, the wear of the drill bit can be directly observed during the experiment.

[0029] It is important to emphasize that, for experimental safety, all four corners of the friction plate 3 are placed within the L-shaped blocks 2, meaning the space enclosed by the L-shaped blocks 2 matches the friction plate 3. The L-shaped blocks 2 are symmetrically arranged around the pressure sensor 19, and the pressure sensor 19 and the L-shaped blocks 2 are placed on the test bench 1. The friction plate 3 must be thick enough to provide sufficient strength, allowing it to be used multiple times.

[0030] Furthermore, such as Figure 2 and Figure 6 As shown, a control cabinet 14 and a hydraulic station 25 are provided on the test bench 1. The control cabinet 14 contains a controller, and the hydraulic station 25 is connected to the hydraulic cylinder 13 via oil pipes. The surface of the control cabinet 14 is equipped with a display screen and operation buttons, including buttons for controlling the lifting and lowering of the hydraulic cylinder 13, a sensor zeroing button, and a drive motor start / stop button, etc. The display screen, operation buttons, hydraulic station 25, pressure sensor 19, and drive motor 21 are all electrically connected to the controller.

[0031] Based on the above embodiments, further optimizations can be made, such as... Figure 5 and Figure 6 As shown, protective covers 27 are provided above the support platform 15 and on the side of the U-shaped frame 5 away from the support platform 15. The edges of the protective covers 27 are detachably connected to the U-shaped frame 5, the support platform 15, and the mounting frame 16, respectively. That is, the edges of the protective covers 27 are fastened with bolts. The protective covers 27 cover the first bevel gear 7 and the second bevel gear 22 to prevent foreign objects from entering the gear meshing area. Moreover, and most importantly, the first bevel gear 7 and the second bevel gear 22 need to be greased to lubricate the gears and prevent the grease from mixing with external foreign objects.

[0032] Based on the above embodiments, further optimization can be made. In order to increase the support strength of the support platform 15, the bottom sides of the support platform 15 are connected to the test platform 1 through the brackets 24. A baffle 17 is provided between the brackets 24 to separate the drive motor 21 and the friction plate 3.

[0033] Based on the above embodiments, further optimization can be made. In actual use, baffles can be set on the side of the U-shaped frame 5 so that the friction plate 3 is enclosed in a space. One of the baffles can be used as an opening and closing door, which can prevent the drill bit from splashing debris during rotation.

[0034] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A test apparatus for friction and wear of down-the-hole drill bits, comprising a test bench (1), characterized in that, The test bench (1) is equipped with a U-shaped frame (5) with the opening facing downward. The top of the U-shaped frame (5) is vertically equipped with a lifting mechanism. The lower part of the lifting mechanism is rotatably connected to the support shaft (11). The surface of the support shaft (11) is equipped with multiple key strips (9) parallel to its axis. The U-shaped frame (5) has a first mounting seat (6) coaxial with the support shaft (11) in the middle position. The mounting tube (8) is rotatably installed in the first mounting seat (6). One end of the mounting tube (8) is driven by the driving device to rotate. The support shaft (11) is movably placed in the mounting tube (8). The mounting tube (8) has a keyway that matches the key bar (9). The key bar (9) is placed in the keyway. The bottom of the support shaft (11) is detachably provided with a down-the-hole drill bit. A friction plate (3) is provided below the support shaft (11), and a pressure sensor (19) is placed below the friction plate (3).

2. The down-the-hole drill bit friction and wear testing device as described in claim 1, characterized in that, The bottom of the support shaft (11) is coaxially provided with a connecting sleeve (4), and the bottom of the connecting sleeve (4) is threadedly connected with a tube shoe (20), which is fitted onto the downhole drill bit.

3. The down-the-hole drill bit friction and wear testing device as described in claim 2, characterized in that, The friction plate (3) has a rotating groove (18) in the middle of its surface, and the rotating groove (18) is located directly below the downhole drill bit.

4. The down-the-hole drill bit friction and wear testing device as described in claim 3, characterized in that, The four corners of the friction plate (3) are placed inside the L-shaped blocks (2). The L-shaped blocks (2) are symmetrically arranged around the pressure sensor (19). The pressure sensor (19) and the L-shaped blocks (2) are arranged on the test bench (1).

5. The down-the-hole drill bit friction and wear testing device as described in claim 1, characterized in that, The lifting mechanism includes a hydraulic cylinder (13) vertically mounted on the top of the U-shaped frame (5). The bottom of the hydraulic cylinder (13) is connected to the U-connecting frame (12). The U-connecting frame (12) has an opening facing downward and a second mounting seat (10) is installed at its bottom. The second mounting seat (10) is fitted on the top of the support shaft (11) and the two are rotatably connected.

6. The down-the-hole drill bit friction and wear testing device as described in claim 4 or 5, characterized in that, The drive device includes a first bevel gear (7) coaxially disposed at one end of the mounting tube (8), one side of the first bevel gear (7) meshing perpendicularly with a second bevel gear (22), the second bevel gear (22) being mounted on a drive shaft (26), the drive shaft (26) being rotatably mounted in a support (23), the support (23) being disposed on a support platform (15), and one side of the support platform (15) being connected to a U-shaped frame (5); A drive motor (21) is provided below the support platform (15). The drive motor (21) is installed on the test bench (1). Both the shaft of the drive motor (21) and the end of the drive shaft (26) away from the second bevel gear (22) are provided with pulleys. The two pulleys are connected by a belt.

7. The down-the-hole drill bit friction and wear testing device as described in claim 6, characterized in that, The test bench (1) is equipped with a control cabinet (14) and a hydraulic station (25). The control cabinet (14) contains a controller, and the hydraulic station (25) is connected to the hydraulic cylinder (13) through an oil pipe. The control cabinet (14) is equipped with a display screen and operation buttons. The display screen, operation buttons, hydraulic station (25), pressure sensor (19), and drive motor (21) are electrically connected to the controller.

8. The down-the-hole drill bit friction and wear testing device as described in claim 7, characterized in that, A protective cover (27) is provided above the support platform (15) and on the side of the U-shaped frame (5) away from the support platform (15). The edge of the protective cover (27) is detachably connected to the U-shaped frame (5), the support platform (15) and the mounting frame (16).

9. The down-the-hole drill bit friction and wear testing device as described in claim 8, characterized in that, The bottom sides of the support platform (15) are connected to the test platform (1) via brackets (24), and baffles (17) are provided between the brackets (24).

10. The down-the-hole drill bit friction and wear testing device as described in claim 1, characterized in that, The two sides of the first mounting base (6) are connected to the U-shaped frame (5) through the mounting frame (16).

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