CN115791063A - Drill fatigue impact damage tester - Google Patents

Abstract

The invention discloses a drill bit fatigue impact damage testing machine in the technical field of impact damage testing, which includes a base and a data acquisition and processing system. The base is fixedly connected with a bracket and a sample fixture, and a direction-changing cylinder is installed on the top of the bracket, and the upper and lower ends of the direction-changing cylinder rotate respectively. It is provided with a driving shaft, a driving assembly for driving the driving shaft to rotate, and a driven shaft vertically slidably connected with the direction-changing cylinder. The outer wall of the driving shaft is provided with a cam groove. The top of the driven shaft is fixedly connected with a foot, and the top of the foot is slidably connected with a The driven rolling pin, the end of the driven rolling pin extends into the cam groove and is fixedly connected with a relief spring with the foot. The bottom of the driven shaft is equipped with an impulse adjustment cylinder driven by the driven shaft. It is threaded and an adjusting ring is installed at each end; it can simulate the impact process of different frequencies and different energies in the actual drilling process, and can also accurately control the impact frequency and impact energy, and make the energy level reach a certain level.

Description

Drill bit fatigue impact damage testing machine

technical field

The invention relates to the technical field of impact damage testing, in particular to a drill bit fatigue impact damage testing machine.

Background technique

Polycrystalline diamond compact (PDC) bits are widely used in the underground drilling process including oil and gas exploration. The main working part of the PDC bit is the PDC bit tooth installed on the crown. The mechanical properties of the PDC bit tooth are It greatly affects the service life of the PDC drill bit, and then greatly affects the time cost and economic cost of the drilling process. The mechanical performance indicators of PDC bit teeth mainly include: impact resistance, wear resistance, thermal stability, etc., among which the impact resistance directly affects the service life of PDC bit teeth.

The current method for testing the impact resistance is to use a conventional drop weight impact testing machine and a pendulum impact testing machine. In the production process of PDC bit, drop hammer impact is often used to test the impact resistance of PDC bit teeth. The general principle of the drop hammer impact test is to drop the impact target onto the PDC bit teeth at a certain height, and evaluate the impact resistance of the sample by calculating the kinetic energy generated at this height. After each impact, if the sample is not damaged, set Impact at a greater height until the specimen is damaged. This test method obtains the conventional impact resistance performance of the sample.

In actual drilling engineering, due to the high speed of the PDC bit, when there is extremely high heterogeneity in the formation (the formation rock and soil contain a large amount of hard phase, similar to concrete mixed with limestone pebbles), the PDC bit During the rotary drilling process, it will be impacted by high-frequency hard phases in the formation rock and soil. Many scholars have discovered this phenomenon, but due to the lack of experimental equipment, it is impossible to carry out indoor experimental tests. According to the commonly used oil drilling parameters, the impact frequency can be calculated to be roughly 1 Hz to 10 Hz, and the specific impact frequency is affected by the heterogeneous hard phase content in the formation. Taking rotary table drilling as an example, when the drill bit is only impacted by one hard rock per revolution in the downhole, the impact frequency is 1Hz. Because the energy of this kind of impact is small, but the frequency is high, the conventional drop hammer impact test has been unable to simulate the high-frequency and low-energy impact process of the actual drilling process, and in addition to providing a high-frequency impact environment, it is also necessary to be able to accurately Controlling the impact frequency and impact energy, and making the energy level reach a certain level, none of the existing equipment can do this well.

Contents of the invention

For above problem, the present invention aims to provide a kind of novel test equipment, and this equipment can build a kind of impact environment that frequency and energy all can be controlled, and PDC drill bit tooth is tested, to simulate and evaluate PDC drill bit tooth sample in actual Drilling service life in heterogeneous formation conditions. The invention solves the problem that the current PDC bit tooth impact test equipment cannot create a higher impact frequency and accurately control energy.

In order to achieve the above object, the present invention provides the following technical solutions: including a base and a data acquisition and processing system, the base is fixedly connected with a bracket and a sample holder, the sample holder is used to clamp the impact sample, and the top of the bracket is equipped with a direction-changing The upper and lower ends of the direction-changing cylinder are respectively provided with a driving shaft, a driving assembly for driving the driving shaft to rotate, and a driven shaft vertically slidingly connected with the direction-changing cylinder. The outer wall of the driving shaft is provided with a cam groove. The top of the driven shaft is fixedly connected with a leg, and the top of the leg is slidably connected with a driven rolling pin, and the end of the driven rolling pin extends into the cam groove and is fixedly connected with a yield spring between the leg, The bottom of the driven shaft is installed with an impulsive adjustment cylinder driven by the driven shaft. The impulsive adjustment cylinder is threaded and an adjustment ring is installed at both ends. The impulse between the two adjustment rings is from top to bottom. The adjustment cylinder is equipped with a dynamometer, a force spring, and an impact head. By rotating the two adjustment rings to change the compression of the force spring to adjust the final pressure applied to the impact head, so that when the impact head touches the impact sample, the impact is guaranteed. Energy is controllable.

As a further solution of the present invention, the reversing cylinder includes a cylinder cover, a cylinder body and a locking assembly for locking the cylinder cover, the cylinder body and a locking assembly, and the bottom of the cylinder cover is fixedly connected with a driven rolling pin for pressing, A collar that makes the driven rolling pins approach each other. The driving shaft includes a shaft body and a replaceable cam body. The clamping part of the shaft body is semicircular and has elasticity, the stopper is slidably connected with the cylinder cover, and a clamping assembly is arranged between the cam body and the shaft body.

As a further solution of the present invention, the clamping assembly includes a clamping block that is slidably connected to the cam body, and a push block that is fixedly connected to the shaft body for pushing the clamping block to move, and a trigger piece is vertically slidably connected to the shaft body , the trigger piece is L-shaped and the top is located outside the shaft body, the push block and the clamping block are both fixedly connected with return springs, and the return springs are fixedly connected with the shaft body and the cam body respectively.

As a further solution of the present invention, the locking assembly includes a locking pin fixedly connected to the barrel lid and a locking sleeve fixedly connected to the barrel, and a locking nut is threadedly connected between the locking sleeve and the locking pin .

As a further solution of the present invention, the top of the bracket is fixedly connected with a snapping groove, the outer wall of the cylinder is fixedly connected with a snapping piece that snaps into the snapping groove, and the snapping piece is fixedly connected with a snapping spring. The top of the clamping spring is fixedly connected with a slide plate fixedly connected with the cylinder cover, and the slide plate is slidably connected with a motor frame.

As a further solution of the present invention, the drive assembly includes a drive motor mounted on the motor frame, and the top of the motor frame is rotatably connected with a driving wheel and a driven wheel, and the driving wheel and the driven wheel are driven by a belt and are sheathed respectively. On the output shaft of the driving motor and the driving shaft, a slide groove is opened on the top side wall of the driving shaft, and a sliding key is fixedly connected to the inner wall of the driven wheel.

As a further solution of the present invention, the impact head and the outer wall of the dynamometer are respectively fixedly connected with projections that are slidably connected with the impulse adjustment cylinder, and the projections are all located between the adjustment rings.

As a further solution of the present invention, the top of the cylinder cover and the bottom of the cylinder body are respectively clamped with a rotation centering block and a linear motion centering block, and the adjacent ends of the rotation centering block and the linear motion centering block are square, The linear motion centering block is vertically slidably connected to the driven shaft through a key.

Compared with prior art, the beneficial effect of the present invention is:

1. In the present invention, by using a specific cylindrical cam mechanical structure, the motion of rotating around the shaft is converted into reciprocating motion along the axial direction, that is, the rotation of the driving shaft causes the cam groove on the side wall of the driving shaft to rotate, and the rolling motion in the cam groove The pin moves up and down along the cam groove, and the rolling pin drives the driven shaft to reciprocate up and down through the feet to achieve continuous impact testing;

2. In the present invention, by controlling the structural size of the cam, an axial travel distance can be set, and with a motor that can control the rotational speed, the frequency of axial reciprocating motion can be accurately calculated through the rotational speed, and the rotational speed level can be changed, that is, The operating frequency of the equipment can be changed, and the impact process of different frequencies in the actual drilling process can be simulated, and the impact frequency can be accurately controlled, and the energy can reach a certain level;

3. In the present invention, the final pressure applied on the impact head can be adjusted by rotating the two adjustment rings to change the compression amount of the force spring, and different pressures can be applied to the impact head according to requirements. The deformation of the force spring behind the sample, and then it can be considered that in the process of impact contact, the force received by the impact sample is constant. By calculating the stroke of the impact head and the force given by the dynamometer, each impact can be preliminarily obtained. The impact energy received by the sample can simulate different energy impact processes in the actual drilling process, and can also accurately control the impact energy and make the energy level reach a certain level.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the accompanying drawings that are required for the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. Those of ordinary skill in the art can also obtain other drawings based on these drawings without any creative effort.

Fig. 1 is a schematic diagram of the overall structure of the present invention;

Fig. 2 is a schematic sectional view of the overall structure of the present invention;

Fig. 3 is a schematic diagram of enlarged structure at A place in Fig. 2 of the present invention;

Fig. 4 is a schematic cross-sectional view of the exploded structure at the junction of the bracket and the direction-changing cylinder of the present invention;

Fig. 5 is a schematic sectional view of the cross-sectional structure of the connection between the cylinder body and the driven shaft of the present invention;

Fig. 6 is a schematic diagram of the enlarged structure at B in Fig. 5 of the present invention;

Fig. 7 is a schematic structural diagram of the connection relationship of the driven shaft of the present invention;

Fig. 8 is a structural schematic diagram of the connection relationship of the cylinder cover of the present invention;

Fig. 9 is a schematic diagram of the exploded structure of the shaft connection relationship of the present invention;

In the accompanying drawings, the list of parts represented by each label is as follows:

1. Base; 2. Bracket; 21. Clamping groove; 3. Reversing cylinder; 31. Cover; 32. Cylinder body; 33. Collar; 34. Clamping piece; 35. Clamping spring; 36. Skateboard ;37, motor frame; 5, rotating centering block; 6, driving shaft; 61, cam groove; 62, shaft body; 63, cam body; 64, limit piece; 7, driven shaft; 71, support foot; 73 , give way spring; 8, linear motion centering block; 9, impulse adjustment cylinder; 91, bump; 10, adjustment ring; 11, sample fixture; 12, driven rolling pin; 14, dynamometer; 15, Force spring; 16, impact head; 17, impact sample; 18, clamp block; 181, push block; 182, trigger piece; 183, return spring; 191, locking pin; 192, locking sleeve; 193, lock Stop nut; 20, drive motor; 201, driving wheel; 202, driven wheel; 203, feather key.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

Please refer to Fig. 1-Fig. 9, the present invention provides a kind of technical solution: including base 1 and data acquisition and processing system, base 1 is fixedly connected with support 2 and sample clamp 11, and sample clamp 11 is used for clamping impact sample 17, support 2 The top is equipped with a direction-changing cylinder 3, and the upper and lower ends of the direction-changing cylinder 3 are respectively rotated to be provided with a driving shaft 6, a drive assembly for driving the driving shaft 6 to rotate, and a driven shaft 7 vertically slidingly connected with the direction-changing cylinder 3. The outer wall of the shaft 6 is provided with a cam groove 61, the top of the driven shaft 7 is fixedly connected with a leg 71, and the top of the leg 71 is slidably connected with a driven rolling pin 12, and the end of the driven rolling pin 12 extends into the cam groove 61 and is connected with the leg. 71 is fixedly connected with a step spring 73, and the bottom of the driven shaft 7 is equipped with an impulse adjustment cylinder 9 driven by the driven shaft 7. The impulse adjustment cylinder 9 is threaded and an adjustment ring 10 is installed at both ends. Between the adjustment rings 10, a force gauge 14, a force spring 15, and an impact head 16 are installed in the impulse adjustment cylinder 9 from top to bottom. By rotating the two adjustment rings 10, the compression amount of the force spring 15 is changed to adjust the final pressure applied to the force. The pressure on the impact head 16, so that when the impact head 16 contacts the impact sample 17, the impact energy can be controlled;

。The equipment can be divided into two parts according to the functional modules. The first part is the transmission part. By using a specific cylindrical cam mechanical structure, the motion of rotating around the shaft is converted into reciprocating motion along the axial direction, that is, the driving shaft 6 rotates, so that the driving shaft 6. The cam groove 61 on the side wall rotates, and the rolling pin 12 in the cam groove 61 moves up and down along the cam groove 61. The rolling pin 12 drives the driven shaft 7 to reciprocate up and down through the leg 71. By controlling the structural size of the cam , can set an axial travel distance, with a motor that can control the speed, the frequency of axial reciprocating motion can be accurately calculated through the speed, and the operating frequency of the equipment can be changed by changing the speed level. The calculation formula of the impact frequency is:

.

Among them, F is the impact frequency of the equipment, the unit is Hz; r is the spindle speed of the equipment, the unit is rev/s; n is the number of up and down strokes of the impact head 16 per one revolution of the equipment spindle, the unit is 1/rev.

。The second critical part is the energy control system. The conventional drop hammer impact test process is to judge the strength level of the test sample by calculating the gravitational potential energy of the hammer head as a whole, that is, it is considered that all the gravitational potential energy of the hammer body acts on the sample. Therefore, the device uses an adjustable force-applying spring 15 and a dynamometer 14 to specify and measure the energy level of a single impact. In order to accurately approximate the actual energy value, it is necessary to shorten the axial travel distance of the first part of the equipment as much as possible. At this time, the deformation of the force spring 15 in the process of contacting the impact sample 17 can be ignored; at the same time, design the impact The deformation amount of the force spring 15 after the head 16 contacts the impact sample 17, and then it can be considered that in the process of impact contact, the force received by the impact sample is a constant, by calculating the stroke of the impact head 16 and the value given by the dynamometer 14 Force, the impact energy received by each impact sample 17 can be preliminarily obtained. The calculation formula is:

.

Wherein, E is the impact energy, and the unit is J; F is the average elastic force of the force spring 15 measured by the dynamometer 14, and the unit is N; S is the stroke of the equipment impact head 16 when reciprocating, and the unit is m; h is the distance between the contact point between the impact sample 17 and the impact head 16 and the highest stroke point of the impact head 16, the unit is m, and h is smaller than S.

The equipment in the present invention mainly includes: a main body structure of the equipment, and a data collection and processing system. The main structure of the equipment includes a base 1, a sample holder 11, a direction changing cylinder 3, a driving shaft 6, a driven shaft 7, a cam groove 61, a foot 71, a driven rolling pin 12, a displacement spring 73, an impulse adjustment cylinder 9, an adjustment Ring 10, force gauge 14, force spring 15, impact head 16. The data acquisition system collects data through the dynamometer 14;

In the main structure of the equipment, the base 1 and the bracket 2 mainly play the role of fixing and supporting the main part of the work; the sample holder 11 is used to fix the impact sample 17 for the test; the driving shaft 6 in the direction changing cylinder 3 rotates, and the driving shaft 6 is a cam structure, the driven shaft 7 is equipped with driven rolling pins 12 on both sides, when the driving shaft 6 rotates, the rolling of the driven rolling pins 12 in the cam groove 61 causes the leg 71 to reciprocate up and down, and the driven shaft 7 The lower end is equipped with an impulse regulating cylinder 9, and the impulse regulating cylinder 9 is used for adjusting the size of the impact energy. Thread is provided on the impulse adjustment cylinder 9, and an adjustment ring 10 is respectively installed at the two ends of the thread, and a dynamometer 14, a force spring 15, and an impact head 16 are housed in the sleeve from top to bottom between the two adjustment rings 10. By rotating the two adjustment rings 10, changing the distance between the two adjustment rings 10, and changing the compression amount of the force spring 15 to adjust the pressure finally applied to the impact head 16, so that when the impact head 16 contacts the impact sample, 17, To ensure that the impact energy is controllable, the impact frequency and impact energy can be accurately controlled, and the magnitude of each impact energy reaches a certain level, and the impact energy can be adjusted at will, thereby simulating different use environments.

As an application example: the preset impact force of the dynamometer 14 is set to be 5000N, the up and down stroke S of the impact head 16 is set to be 20mm, the distance h between the impact sample 17 and the highest point of the stroke of the impact head 16 is 10mm, and the design of the drive shaft 6 The reciprocating motion of the driven shaft 7 caused by each revolution is 4 times, and the rotating speed of the driving shaft is 20 circles per second. It can be seen that the impact energy received by each impact on the sample 17 is about 50 J, and the impact frequency is 80 Hz.

As an application example: the preset impact force of the dynamometer 14 is set to 2000N, the up and down travel S of the impact head 16 is set to be 10mm, the distance h between the impact sample 17 and the highest point of the impact head 16 stroke is 5mm, and the design of the drive shaft 6 The reciprocating motion of the driven shaft 7 caused by each revolution is 2 times, and the rotating speed of the driving shaft 6 is 10 circles per second. It can be seen that the impact energy received by each impact on the sample 17 is about 10 J, and the impact frequency is 20 Hz.

As an application example: the preset impact force of the dynamometer 14 is set to be 100N, the up and down stroke S of the impact head 16 is set to be 10mm, the distance h between the impact sample 17 and the highest point of the stroke of the impact head 16 is 9mm, and the design of the drive shaft 6 The reciprocating motion of the driven shaft 7 caused by each revolution is 2 times, and the rotational speed of the driving shaft 6 is 1 circle per second. It can be seen that the impact energy received by each impact on the sample 17 is about 0.1 J, and the impact frequency is 2 Hz.

Preferred application example: In order to minimize the test error caused by the contact time between the impact head 16 and the impact sample 17, the up and down stroke of the impact head 16 is set to be no more than 10 mm, and the distance between the impact sample 17 and the highest point of the impact head 16 stroke is not less than 5 mm. And the designed impact frequency of the impact sample 17 is not less than 50 Hz, so as to ensure that the set impact force is similar to the impact force received by the impact sample 17 during the actual impact process.

In the above embodiments, the force of the dynamometer 14, the up and down travel of the impact head 16, the distance between the impact sample 17 and the highest point of the impact head 16 stroke, the number of impacts per revolution of the driving shaft 6, and the rotational speed of the driving shaft 6 are controllable parameters. , so it can meet the expected actual design requirements of the equipment and complete the control of the frequency and energy of the impact process.

Equipment operation method:

S1. Open the impact force measuring system, and monitor the dynamometer 14;

S2. The impact sample 17 of the test is installed on the sample holder 11 for fixing;

S3. Manually rotate the driving shaft 6 so that the impact head 16 is at the top of the stroke;

S4. Rotate and adjust the two adjustment rings 10; first rotate the lowermost adjustment ring 10 to keep the impact head 16 and the upper surface of the test sample 17 at a fixed distance;

S5. Keep the impact head 16 just in contact with the upper surface of the test sample 17, fix the lower adjusting ring 10, then rotate the adjusting ring 10 on the upper part to control the position of the dynamometer 14, and adjust the length of the applying force spring 15 and the position of the dynamometer 14. position, so that the force of the dynamometer 14 remains as the experimental preset value;

S6. Turn on the dynamometer 14 to record the impact force, and turn on the power to make the motor drive the equipment to rotate, and start the impact test until the sample 17 reaches the preset damage condition;

S7. Extract the impact force data from the impact force data acquisition system, calculate and record the total impact energy received by the test sample 17 during the whole process.

As a further solution of the present invention, the reversing cylinder 3 includes a cylinder cover 31, a cylinder body 32 and a locking assembly for locking the cylinder cover 31, the cylinder body 32 and a locking assembly. 12, the collar 33 that makes the driven rolling pins 12 close to each other, the driving shaft 6 includes a shaft body 62 and a replaceable cam body 63, and the shaft body 62 is clamped with a limiter 64 for restricting the shaft body 62 from moving up and down , the stopper 64 and the shaft body 62 are clamped in a semicircular shape and have elasticity, the stopper 64 is slidably connected to the cylinder cover 31, and a snap-fit assembly is arranged between the cam body 63 and the shaft body 62;

During use, the cylinder cover 31 and the cylinder body 32 are fixed by the locking assembly. When it is necessary to test the impact of different frequencies, the limiter 64 is separated from the shaft body 62 first, so that the shaft body 62 can move up and down, and then the lock is canceled The component locks between the cylinder cover 31 and the cylinder body 32, the cylinder cover 31 drives the collar 33 to move up, and after the collar 33 is separated from the driven rolling pin 12, the spring 73 pushes the driven rolling pin 12 outward Move, make the driven rolling pin 12 move out of the cam groove 61, and when the cam body 63 is taken out, it will not be affected; Position limit, take out the cam body 63, replace the cam body 63 with a different frequency, connect the replaced cam body 63 with the shaft body 62, and then reset the cylinder cover 31, the collar 33 at the bottom of the cylinder cover 31 presses down on the positioning assembly , so that the positioning assembly is separated from the driven shaft 7, so as to avoid the impact of the positioning assembly on the rotation of the driven shaft 7.

As a further solution of the present invention, the clamping assembly includes a clamping block 18 slidingly connected to the cam body 63, and a push block 181 fixedly connected to the shaft body 62 for pushing the clamping block 18 to move, and the shaft body 62 slides vertically A trigger piece 182 is connected, the trigger piece 182 is L-shaped and the top is located outside the shaft body 62, the push block 181 and the clamping block 18 are fixedly connected with a return spring 183, and the return spring 183 is fixedly connected with the shaft body 62 and the cam body 63 respectively ;

In the process of replacing the cam body 63 with different frequencies, after the cylinder cover 31 moves to the top end, the cam body 63 is pulled upward by the shaft body 62. When the trigger piece 182 contacts the cylinder cover 31, the trigger piece 182 stops moving upward, and the push block 181 and the clamping block 18 continue to rise with the shaft body 62, the trigger 182 squeezes the push block 181, the push block 181 stretches the return spring 183 fixedly connected with it and pushes the clamping block 18 out of the shaft body 62, the clamping block 18 After the shaft body 62 is removed, the shaft body 62 and the cam body 63 can be separated, so that the cam body 63 can be replaced at will, so that the testing machine can change the number of up and down strokes of the impact head 16 in each revolution of the driving shaft 6, thereby realizing a single The testing machine provides different impact frequencies, which greatly reduces the test cost of the drill bit fatigue impact test; the installation process is opposite to the disassembly process, and will not be described in detail here.

As a further solution of the present invention, the locking assembly includes a locking pin 191 fixedly connected to the cylinder cover 31 and a locking sleeve 192 fixedly connected to the cylinder body 32, and a lock is threaded between the locking sleeve 192 and the locking pin 191. stop nut 193;

During use, unscrew the lock nut 193, move the cylinder cover 31 upwards, the cylinder cover 31 drives the lock pin 191 to rise and break away from the lock sleeve 192, and vice versa, move the cylinder cover 31 downward to insert the lock pin 191 into the lock sleeve 192 Inside, the locking nut 193 can be screwed on to realize the separation and connection of the cylinder cover 31 and the cylinder body 32 , which is convenient for subsequent replacement of the cam body 63 .

As a further solution of the present invention, the top of the bracket 2 is fixedly connected with a clamping groove 21, and the outer wall of the cylinder 32 is fixedly connected with a clamping member 34 clamped with the clamping groove 21, and the clamping member 34 is fixedly connected with a clamping spring 35, The top of the clamping spring 35 is fixedly connected with a slide plate 36 fixedly connected with the cylinder cover 31, and the slide plate 36 is slidably connected with a motor frame 37;

During use, the connection between the changing cylinder 3 and the bracket 2 can be realized through the cooperation of the clamping groove 21 and the clamping piece 34, which facilitates the replacement of the worn base 1 and reduces the use cost of the testing machine; cancels the alignment of the cylinder in the locking assembly After the body 32 and the cylinder cover 31 are locked, the clamping spring 35 in the compressed state is stretched, so that the slide plate 36 drives the cylinder cover 31 to move upward, without the need for the worker to hold it by hand, and then it is convenient for the worker to pull the driving shaft 6 to move upward; the slide plate 36 moves up and down to move along the The motor frame 37 slides vertically, and the motor frame 37 plays a guiding role on the slide plate 36, avoiding the offset between the cylinder cover 31 and the cylinder body 32, resulting in increased difficulty in replacing the cam body 63.

As a further solution of the present invention, the drive assembly includes a driving motor 20 mounted on the motor frame 37, the top of the motor frame 37 is rotatably connected with a driving wheel 201 and a driven wheel 202, and the driving wheel 201 and the driven wheel 202 are driven by a belt and are respectively covered. Set on the output shaft of the driving motor 20 and the driving shaft 6, the top side wall of the driving shaft 6 is provided with a chute, and the inner wall of the driven wheel 202 is fixedly connected with a sliding key 203;

During use, the driving motor 20 drives the driving wheel 201 to rotate through the output shaft, the driving wheel 201 drives the driven wheel 202 to rotate through the belt, and the driven wheel 202 drives the driving shaft 6 to rotate through the feather key 203, so as to drive the driving shaft 6 to rotate, so that the testing machine Work, the chute on the side wall of the driving shaft 6 cooperates with the feather key 203 on the inner wall of the driven wheel 202, so that the driven wheel 202 can drive the driving shaft 6 to rotate without affecting the movement of the driving shaft 6 up and down. In addition, the sliding key 203 passes through the chute. The driving shaft 6 can be driven to rotate without affecting the sliding of the driving shaft 6 up and down.

As a further solution of the present invention, the impact head 16 and the outer wall of the dynamometer 14 are respectively fixedly connected with bumps 91 that are slidingly connected to the impulse adjustment cylinder 9, and the bumps 91 are all located between the adjustment rings 10;

During use, turn the adjustment ring 10, and the adjustment ring 10 drives the impact head 16 and the dynamometer 14 to move through the bump 91. When the upper adjustment ring 10 is rotated, it is only to adjust the compression amount of the force spring 15. When the lower adjustment ring 10 is rotated, When the ring 10 is adjusted, the compression amount of the applying spring 15 is adjusted and the distance between the impact head 16 and the impact sample 17 is also adjusted.

As a further solution of the present invention, the top of the cylinder cover 31 and the bottom of the cylinder body 32 are respectively clamped with a rotation centering block 5 and a linear motion centering block 8, and the adjacent ends of the rotation centering block 5 and the linear motion centering block 8 are both Square, linear motion centering block 8 and driven shaft 7 are vertically slidably connected by keys;

During use, the linear motion centering block 8 restricts the rotation of the driven shaft 7 through the key, so as to prevent the driven shaft 7 from rotating with the driving shaft 6, resulting in the testing machine being unable to perform the impact test.

Claims (8)

1. Drill bit fatigue impact damage testing machine, including a base (1) and a data acquisition and processing system, characterized in that: the base (1) is fixedly connected with a bracket (2) and a sample holder (11), and the sample holder (11 ) is used to clamp the impact sample (17), the top of the bracket (2) is equipped with a direction changing cylinder (3), and the upper and lower ends of the direction changing cylinder (3) are respectively rotated and provided with a driving shaft (6). The driving assembly that drives the driving shaft (6) to rotate and the driven shaft (7) that is vertically slidably connected to the direction changing cylinder (3). The outer wall of the driving shaft (6) is provided with a cam groove (61), and the driven shaft (6) The top of the shaft (7) is fixedly connected with a foot (71), and the top of the foot (71) is slidably connected with a driven rolling pin (12), and the end of the driven rolling pin (12) extends to the cam groove (61 ) and between the legs (71) is fixedly connected with a relief spring (73), and the bottom of the driven shaft (7) is installed with an impulse adjustment cylinder (9) driven by the driven shaft (7). The adjustment cylinder (9) is threaded and an adjustment ring (10) is installed at each end, and a dynamometer (14) is installed in the impulse adjustment cylinder (9) from top to bottom between the two adjustment rings (10). ), the force spring (15), and the impact head (16), and the final pressure applied to the impact head (16) is adjusted by rotating the two adjustment rings (10) to change the compression amount of the force spring (15). 2. The drill bit fatigue impact damage testing machine according to claim 1, characterized in that: the change direction cylinder (3) includes a cylinder cover (31), a cylinder body (32) and a cylinder cover (31) for locking and the cylinder body (32) and locking assembly, the bottom of the cylinder cover (31) is fixedly connected with a collar (33) for squeezing the driven rolling pins (12) so that the driven rolling pins (12) are close to each other ), the drive shaft (6) includes a shaft body (62) and a replaceable cam body (63), and the shaft body (62) is clamped with a stopper (64) for restricting the shaft body (62) from moving up and down ), the stopper (64) and the shaft body (62) are snapped out into a semicircular shape and have elasticity, the stopper (64) is slidably connected with the cylinder cover (31), and the cam body (63) A clamping assembly is arranged between the shaft body (62). 3. The drill bit fatigue impact damage testing machine according to claim 2, characterized in that: the clamping assembly includes a clamping block (18) slidingly connected with the cam body (63), fixed with the shaft body (62) A push block (181) for pushing the clamping block (18) to move is connected, and a trigger piece (182) is vertically slid inside the shaft body (62). The trigger piece (182) is L-shaped and the top is located at Outside the shaft body (62), the push block (181) and the clamping block (18) are fixedly connected with a return spring (183), and the return spring (183) is connected to the shaft body (62) and the cam body (63) respectively. ) fixed connection. 4. The drill bit fatigue impact damage testing machine according to claim 3, characterized in that: the locking assembly includes a locking pin (191) fixedly connected to the barrel cover (31) and a locking pin (191) fixedly connected to the barrel (32). A lock sleeve (192), a lock nut (193) is threadedly connected between the lock sleeve (192) and the lock pin (191). 5. The drill bit fatigue impact damage testing machine according to claim 4, characterized in that: the top of the bracket (2) is fixedly connected with a clamping groove (21), and the outer wall of the cylinder (32) is fixedly connected with a clamping groove (21). The clamping piece (34) that is clamped to the connecting groove (21), the clamping piece (34) is fixedly connected with a clamping spring (35), and the top of the clamping spring (35) is fixedly connected with the cylinder cover (31 ) is fixedly connected to the slide plate (36), and the slide plate (36) is slidably connected to the motor frame (37). 6. The drill bit fatigue impact damage testing machine according to claim 5, characterized in that: the drive assembly includes a drive motor (20) mounted on the motor frame (37), and the top of the motor frame (37) rotates A driving wheel (201) and a driven wheel (202) are connected, and the driving wheel (201) and the driven wheel (202) are driven by a belt and respectively sleeved on the output shaft of the driving motor (20) and the driving shaft (6), A chute is provided on the top side wall of the drive shaft (6), and a sliding key (203) is fixedly connected to the inner wall of the driven wheel (202). 7. The drill bit fatigue impact damage testing machine according to claim 2, characterized in that: the impact head (16) and the outer wall of the dynamometer (14) are respectively fixedly connected with a protrusion that is slidingly connected with the impact force adjustment cylinder (9). blocks (91), and the bumps (91) are all located between the adjustment rings (10). 8. The drill bit fatigue impact damage testing machine according to claim 7, characterized in that: the top of the cylinder cover (31) and the bottom of the cylinder (32) are respectively engaged with a rotating centering block (5), a linear motion The middle block (8), the adjacent ends of the rotary centering block (5) and the linear motion centering block (8) are all square, and the distance between the linear motion centering block (8) and the driven shaft (7) Swipe vertically to connect via keys.

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