A mechanical device for measuring drilling depth in real time and its use method

Abstract

The present invention provides a mechanical device for measuring drilling depth in real time and a method for using the device. The device comprises a derrick, wherein a hollow track shaft and hollow track half-shafts are fixedly disposed on both sides of the derrick interior. A rotating hollow track half-shaft is disposed on one side of the hollow track shaft, and the rotating hollow track half-shaft abuts against the hollow track half-shaft to form a complete shaft. An upper synchronous wheel is disposed at the top of one side of the hollow track shaft, and a lower synchronous wheel is disposed at the bottom. The lower synchronous wheel and the upper synchronous wheel are connected by a synchronous belt. A fixed seat is fixed to the synchronous belt, and a movable connecting device is disposed on one side of the fixed seat. The movable connecting device abuts against the hollow track shaft and the hollow track half-shaft and slides within the belt. A counting device is disposed on the lower synchronous wheel, and the counting device is used to measure the number of revolutions of the lower synchronous wheel, thereby converting the number of revolutions into the drilling depth. The device is a mechanical device with a simple structure, strong anti-interference ability, reliable operation, and good stability and safety performance.

Description

Technical Field

[0001] The present invention relates to the technical field of drilling measurement, and in particular to a mechanical device for measuring drilling depth in real time and a method for using the device. Background Art

[0002] In existing natural gas drilling, oilfield drilling, and geological exploration drilling processes, drilling depth is typically measured using a winch, motor, cable, or sensor, or by manually calculating the number and length of different drill rods. However, sensor-based measurement of drilling depth can easily lead to unstable sensor signals or even sensor inactivity due to complex conditions below the surface, resulting in large errors and wasted resources. Manual calculation of drilling depth can also lead to inaccurate calculations due to the operator's negligence, such as forgetting the number and length of drill rods, and complex calculation formulas. This can also increase the workload of operators. To address these issues, a mechanical device for real-time drilling depth measurement and its use method are proposed. Summary of the Invention

[0003] The main purpose of the present invention is to provide a mechanical device for real-time measurement of drilling depth and a method for using the same, so as to solve the problems in the above-mentioned background technology.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is as follows: comprising a derrick, wherein a hollow track shaft and a hollow track half-shaft are fixedly provided on both sides of the derrick, a rotating hollow track half-shaft is provided on one side of the hollow track shaft, and the rotating hollow track half-shaft abuts against the hollow track half-shaft to form a complete shaft;

[0005] An upper synchronous wheel is provided on the top of one side of the hollow track shaft, and a lower synchronous wheel is provided on the bottom. The lower synchronous wheel and the upper synchronous wheel are connected by a synchronous belt. A fixed seat is fixed on the synchronous belt. A movable connecting device is provided on one side of the fixed seat. The movable connecting device abuts against the hollow track shaft and slides inside the hollow track half shaft.

[0006] A hinged rotating hoop is provided on one side of the fixed hoop in the mobile connection device. The fixed hoop and the rotating hoop are used to clamp the faucet, thereby driving the mobile connection device to move during the drilling process. The movement of the mobile connection device can drive the synchronous belt to rotate;

[0007] A counting device is provided at the lower synchronous wheel, which is used to measure the number of rotations of the lower synchronous wheel, so as to calculate the drilling depth based on the number of rotations.

[0008] In the preferred embodiment, a slide groove is provided in the middle of the fixing seat, a guide column is fixed in the slide groove, a sliding block is provided on the guide column, springs are provided on both sides of the block, and the springs are sleeved on the guide column.

[0009] In the preferred embodiment, the slider is fixed to the mobile connecting device, a sliding shaft is fixed on one side of the fixed clamp, and a sliding half shaft is fixed on the other side, and the slider is fixed on the sliding shaft;

[0010] A rotating sliding half-shaft is fixed on one side of the rotating clamp, the rotating sliding half-shaft rests on the sliding half-shaft to form a whole shaft, the sliding shaft rests on the hollow track shaft and slides in the rotating sliding half-shaft and the sliding half-shaft rest on the hollow track half-shaft and the rotating hollow track half-shaft and slides in the shaft.

[0011] In the preferred embodiment, through grooves are provided on both sides of the hollow track shaft, and a through groove is provided on one side of the whole shaft formed by the hollow track half shaft and the rotating hollow track half shaft, and the movable connecting device slides against the through groove.

[0012] In the preferred embodiment, the upper synchronous wheel and the lower synchronous wheel are connected to the hollow track shaft through a bearing seat, a magnet block seat is fixed on the bearing seat of the lower synchronous wheel, a second magnet block is fixed on the magnet block seat, a first magnet block is fixed on the synchronous belt, and the second magnet block is directly opposite to the first magnet block;

[0013] The fixing seat is arranged at the upper end of one side of the synchronous belt, and the first magnet block is arranged at the lower end of the other side of the synchronous belt.

[0014] In the preferred embodiment, one end of the counting shaft in the counting device passes through the lower synchronous wheel and abuts against the hollow track shaft through the bearing seat, and the other end abuts against the derrick through the bearing seat;

[0015] An inner wheel is provided between the lower synchronous wheel and the counting shaft, the inner wheel is fixed on the counting shaft, a ratchet is provided in the lower synchronous wheel, a hinged pawl is provided in the groove outside the inner wheel, one end of the pawl is pressed against the groove and rotated by a torsion spring and a pin shaft, and the pawl presses against the ratchet;

[0016] During the drilling process, the pawl is stuck on the ratchet wheel, thereby driving the inner wheel and the counting shaft to rotate through the lower synchronous wheel to count;

[0017] During the drilling and retrieving process, the pawl disengages the ratchet wheel to keep the inner wheel and the counting shaft stationary.

[0018] In a preferred embodiment, a counting driving wheel and a plurality of reset counting driven wheels are provided on the counting shaft, and a number ring is provided on the reset counting driven wheel.

[0019] In the preferred embodiment, an auxiliary gear shaft is provided on one side of the counting shaft, one end of the auxiliary gear shaft abuts against the hollow track shaft through the auxiliary gear shaft seat, and the other end abuts against the derrick through the bearing seat;

[0020] An auxiliary driving wheel and a plurality of auxiliary driven wheels are provided on the auxiliary gear shaft.

[0021] In the preferred embodiment, teeth are provided on both sides of the reset counting driven wheel, one side of the reset counting driven wheel is full of teeth and the other side is one tooth, and two adjacent reset counting driven wheels are connected by an auxiliary driven wheel;

[0022] The previous reset count driven wheel rotates one circle, and the next reset count driven wheel rotates one tenth of a circle.

[0023] The method is as follows: S1, the faucet is connected to the drill pipe, and the faucet is clamped between the fixed clamp and the rotating clamp;

[0024] S2. When the faucet and the drill rod move downward, the synchronous belt moves, and at the same time, the lower synchronous wheel, the inner wheel and the counting shaft rotate. The counting driving wheel turns the auxiliary driving wheel to rotate, and the auxiliary driving wheel turns the reset counting driven wheel to rotate. The gears are turned in sequence to count. The drilling depth is equal to the outer surface circumference of the lower synchronous wheel multiplied by the counted number.

[0025] S3. When the faucet moves upward, the lower synchronous wheel does not act on the inner wheel through the ratchet and the pawl, so that the counting device does not count;

[0026] S4. Repeat the drilling below, and the counting device can accumulate the count to obtain the accurate drilling depth.

[0027] The present invention provides a mechanical device for real-time measurement of drilling depth and a method for using the same, with the following beneficial effects:

[0028] 1. The structure is all mechanical devices with simple structure, strong anti-interference ability, reliable operation, good stability and safety performance;

[0029] 2. The drilling depth measuring device is fixed on the derrick and is driven synchronously with drilling. It does not require a winch, motor, or sensor. It is simple, practical, and cost-effective.

[0030] 3. Springs are installed at the upper and lower ends of the slider in the fixed seat to reduce vibration and impact, reduce the errors caused by vibration and impact, and ensure the accuracy of counting.

[0031] 4. The synchronous belt is equipped with a magnet block, which relies on the magnetic force of the magnet block and its own gravity to compensate for the error caused by replacing the drill rod and ensure the accuracy of the counting. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The present invention will be further described below with reference to the accompanying drawings and examples:

[0033] Figure 1 It is an axonometric view of the overall structure of the present invention;

[0034] Figure 2 This is a side view of the connecting shaft between the synchronous belt and the movable connecting device of the present invention;

[0035] Figure 3 This is an axonometric view of the connection structure of the technical device of the present invention;

[0036] Figure 4 This invention Figure 3 posterior structural view;

[0037] Figure 5 It is a partial enlarged view a of the present invention;

[0038] Figure 6 This is a side view of the lower synchronous wheel axle of the present invention;

[0039] Figure 7 It is a front view of the inner wheel of the present invention;

[0040] In the figure: derrick 1; hollow track shaft 101; hollow track half-shaft 102; rotating hollow track half-shaft 103; mobile connecting device 2; fixed clamp 201; rotating clamp 202; sliding half-shaft 203; rotating sliding half-shaft 204; sliding shaft 205; slider 206; synchronous belt 3; fixed seat 301; guide column 302; spring 303; first magnet block 304; counting device 4; lower synchronous wheel 5; upper synchronous wheel 6; counting shaft 7; counting driving wheel 8; inner wheel 9; reset counting driven wheel 10; number ring 11; magnet block seat 12; second magnet block 13; auxiliary gear shaft 14; auxiliary driving wheel 15; auxiliary driven wheel 16; auxiliary gear shaft seat 17; pawl 18; torsion spring 19; ratchet 20. DETAILED DESCRIPTION

[0041] Example 1

[0042] like Figures 1 to 7 As shown, a mechanical device for measuring drilling depth in real time and a method for using the device include a derrick 1, wherein a hollow track shaft 101 and a hollow track half-shaft 102 are fixedly provided on both sides of the derrick 1. A rotating hollow track half-shaft 103 is provided on one side of the hollow track shaft 101, and the rotating hollow track half-shaft 103 abuts against the hollow track half-shaft 102 to form a complete shaft.

[0043] An upper synchronous wheel 6 is provided on the top of one side of the hollow track shaft 101, and a lower synchronous wheel 5 is provided on the bottom. The lower synchronous wheel 5 and the upper synchronous wheel 6 are connected by a synchronous belt 3. A fixed seat 301 is fixed on the synchronous belt 3. A movable connecting device 2 is provided on one side of the fixed seat 301. The movable connecting device 2 abuts against the hollow track shaft 101 and slides inside the hollow track half shaft 102.

[0044] A hinged rotating hoop 202 is provided on one side of the fixed hoop 201 in the mobile connecting device 2. The fixed hoop 201 and the rotating hoop 202 are used to clamp the faucet, thereby driving the mobile connecting device 2 to move during the drilling process. The movement of the mobile connecting device 2 can drive the synchronous belt 3 to rotate;

[0045] A counting device 4 is provided at the lower synchronous wheel 5. The counting device 4 is used to measure the number of rotations of the lower synchronous wheel 5, thereby converting the number of rotations into the drilling depth. With this structure, the faucet is fixedly clamped between the fixed clamp 201 and the rotating clamp 202. The two sides of the mobile connecting device 2 slide against the hollow track shaft 101, the hollow track half-shaft 102, and the rotating hollow track half-shaft 103. The rotation of the hollow track half-shaft 102 and the rotating hollow track half-shaft 103 can clamp the fixed clamp 201 and the rotating clamp 202. Rubber rings are contained in the fixed clamp 201 and the rotating clamp 202 to ensure a more secure clamping of the faucet. When the drilling moves downward, the mobile connecting device 2 can drive the synchronous belt 3 to move, thereby driving the lower synchronous wheel 5 to rotate and driving the counting device 4 to count, thereby calculating the drilling depth.

[0046] In the preferred embodiment, a guide post 302 is fixedly mounted within a central slot in the fixed base 301. A sliding block 206 is mounted on the guide post 302, and springs 303 are mounted on either side of the slider 206. This structure prevents drilling vibrations from affecting the mobile connector 2, which is then slidably connected to the fixed base 301 via the slider 206 and spring 303. This prevents drilling vibrations from affecting the accuracy of the count.

[0047] In the preferred embodiment, the slider 206 is fixed to the mobile connecting device 2, a sliding shaft 205 is fixed on one side of the fixed clamp 201, and a sliding half shaft 203 is provided on the other side, and the slider 206 is fixed on the sliding shaft 205;

[0048] A rotating sliding half-shaft 204 is fixed to one side of the rotating clamp 202. The rotating sliding half-shaft 204 abuts against the sliding half-shaft 203 to form a complete shaft. The sliding shaft 205 abuts against the hollow track shaft 101 and slides. The rotating sliding half-shaft 204 and the sliding half-shaft 203 abut against the hollow track half-shaft 102 and slide within the rotating hollow track half-shaft 103. With this structure, the fixed clamp 201 and the rotating clamp 202 are used to clamp the faucet. The fixed clamp 201 and the rotating clamp 202 are then further clamped by the hollow track half-shaft 102 and the rotating hollow track half-shaft 103, ensuring a secure clamping and making it easier to clamp and remove the faucet.

[0049] In the preferred embodiment, through slots are provided on both sides of the hollow track shaft 101, and a through slot is provided on one side of the entire shaft formed by the hollow track half shaft 102 and the rotating hollow track half shaft 103, and the movable connecting device 2 slides against the through slots.

[0050] In the preferred embodiment, the upper synchronous wheel 6 and the lower synchronous wheel 5 are connected to the hollow track shaft 101 through a bearing seat. A magnet block seat 12 is fixed on the bearing seat of the lower synchronous wheel 5, and a second magnet block 13 is fixed on the magnet block seat 12. A first magnet block 304 is fixed on the synchronous belt 3, and the second magnet block 13 is directly opposite to the first magnet block 304.

[0051] The fixing seat 301 is arranged at the upper end of one side of the synchronous belt 3, and the first magnet block 304 is arranged at the lower end of the other side of the synchronous belt 3. With this structure, the interaction between the first magnet block 304 and the second magnet block 13 and the self-weight of the first magnet block 304 can eliminate the gap.

[0052] In the preferred embodiment, one end of the counting shaft 7 in the counting device 4 passes through the lower synchronous wheel 5 and abuts against the hollow track shaft 101 through the bearing seat, and the other end abuts against the derrick 1 through the bearing seat;

[0053] An inner wheel 9 is provided between the lower synchronous wheel 5 and the counting shaft 7. The inner wheel 9 is fixed on the counting shaft 7. A ratchet 20 is provided in the lower synchronous wheel 5. A hinged pawl 18 is provided in the groove outside the inner wheel 9. One end of the pawl 18 is pressed against the groove and rotated by a torsion spring 19 and a pin shaft. The pawl 18 presses against the ratchet 20.

[0054] During the drilling process, the pawl 18 is stuck on the ratchet wheel 20, thereby driving the inner wheel 9 and the counting shaft 7 to rotate through the lower synchronous wheel 5 to count;

[0055] During the drilling and retrieving process, the pawl 18 disengages the ratchet 20 so that the inner wheel 9 and the counting shaft 7 remain stationary.

[0056] In the preferred embodiment, a counting drive wheel 8 and multiple reset counting driven wheels 10 are mounted on the counting shaft 7, each with a number ring 11. With this structure, the reset counting driven wheel 10 is mounted on the counting shaft 7 and rotates independently. The counting drive wheel 8 is fixed to the counting shaft 7. The rotation of the counting drive wheel 8 drives the auxiliary drive wheel 15, which in turn drives the first reset counting driven wheel 10 through the auxiliary drive wheel 15, and then the auxiliary driven wheel 16 transmits the rotation to count.

[0057] In the preferred embodiment, an auxiliary gear shaft 14 is provided on one side of the counting shaft 7, one end of the auxiliary gear shaft 14 rests on the hollow track shaft 101 through the auxiliary gear shaft seat 17, and the other end rests on the derrick 1 through the bearing seat;

[0058] The auxiliary gear shaft 14 is provided with an auxiliary driving wheel 15 and a plurality of auxiliary driven wheels 16. With this structure, gears are provided on both sides of the auxiliary driven wheel 16. The auxiliary driven wheel 16 is sleeved on the auxiliary gear shaft 14 and rotates independently. The auxiliary driven wheel 16 is connected to two adjacent reset counting driven wheels 10, and the counting driving wheel 8 meshes and rotates with the auxiliary driving wheel 15.

[0059] In the preferred embodiment, teeth are provided on both sides of the reset counting driven wheel 10, one side of the reset counting driven wheel 10 is full of teeth and the other side is one tooth, and two adjacent reset counting driven wheels 10 are connected by an auxiliary driven wheel 16;

[0060] The previous reset counting driven wheel 10 rotates one circle, and the latter reset counting driven wheel 10 rotates one tenth of a circle. By this structure, transmission counting is carried out in sequence, thereby the number of rotations of the upper synchronous wheel 6 can be measured, thereby calculating the drilling depth.

[0061] Example 2

[0062] like Figures 1 to 7 As shown, further explained in combination with Example 1: the method is: the faucet is connected to the drill pipe, and the faucet is clamped between the fixed clamp 201 and the rotating clamp 202; when the faucet and the drill pipe move downward, the synchronous belt 3 is driven to move, and at the same time, the lower synchronous wheel 5, the inner wheel 9 and the counting shaft 7 are driven to rotate, and the counting driving wheel 8 drives the auxiliary driving wheel 15 to rotate, and the auxiliary driving wheel 15 drives the reset counting driven wheel 10 to rotate, and the gears are driven in sequence to count, and the drilling depth is equal to the outer surface circumference of the lower synchronous wheel 5 multiplied by the counted number; when the faucet moves upward, the lower synchronous wheel 5 will not act on the inner wheel 9 through the ratchet 20 and the pawl 18, so that the counting device 4 does not count; repeat the drilling below, and the counting device 4 can accumulate the count to obtain an accurate drilling depth.

[0063] When the drilling operation moves downward, the slider 206 abuts against the bottom of the slide groove of the fixed seat 301, thereby driving the synchronous belt 3 to rotate, the ratchet 20 rotates forward, and drives the inner wheel 9 to rotate through the pawl 18, and counting starts; when the drilling operation moves upward, the slider 206 abuts against the top of the slide groove of the fixed seat 301, driving the synchronous belt 3 to rotate, and the ratchet 20 reverses, so that it will not act on the pawl 18 and the inner wheel 9 will rotate, and counting will not occur at this time.

[0064] A gap is generated by the slider 206 in the sliding groove of the fixing seat 301, and the gap can be eliminated by the interaction between the first magnet block 304 and the second magnet block 13 and the gravity of the first magnet block 304 itself.

[0065] The above embodiments are merely preferred technical solutions of the present invention and should not be construed as limiting the present invention. The scope of protection of the present invention shall be the technical solutions set forth in the claims, including equivalent alternatives to the technical features of the technical solutions set forth in the claims. In other words, equivalent alternatives and improvements within this scope are also within the scope of protection of the present invention.

Claims

1. A mechanical device for real-time measurement of drilling depth, characterized by: The derrick comprises a derrick (1), wherein a hollow track shaft (101) and a hollow track half shaft (102) are fixedly provided on both sides of the derrick (1), a rotating hollow track half shaft (103) is provided on one side of the hollow track shaft (101), and the rotating hollow track half shaft (103) abuts against the hollow track half shaft (102) to form a whole shaft; An upper synchronous wheel (6) is provided on the top of one side of the hollow track shaft (101), and a lower synchronous wheel (5) is provided on the bottom. The lower synchronous wheel (5) and the upper synchronous wheel (6) are connected via a synchronous belt (3). A fixed seat (301) is fixed on the synchronous belt (3). A movable connecting device (2) is provided on one side of the fixed seat (301). The movable connecting device (2) abuts against the hollow track shaft (101) and slides inside the hollow track half shaft (102). A hinged rotating hoop (202) is provided on one side of the fixed hoop (201) in the mobile connecting device (2). The fixed hoop (201) and the rotating hoop (202) are used to clamp the faucet, thereby driving the mobile connecting device (2) to move during the drilling process. The movement of the mobile connecting device (2) can drive the synchronous belt (3) to rotate. A counting device (4) is provided at the lower synchronous wheel (5), and the counting device (4) is used to measure the number of rotations of the lower synchronous wheel (5), so as to calculate the drilling depth according to the number of rotations; A slide groove is provided in the middle of the fixed seat (301), a guide column (302) is fixed in the slide groove, a sliding block (206) is provided on the guide column (302), springs (303) are provided on both sides of the block (206), and the springs (303) are sleeved on the guide column (302); The slider (206) is fixed on the mobile connecting device (2); a sliding shaft (205) is fixed on one side of the fixed hoop (201); a sliding half shaft (203) is provided on the other side; and the slider (206) is fixed on the sliding shaft (205); A rotating sliding half-shaft (204) is fixedly provided on one side of the rotating hoop (202), the rotating sliding half-shaft (204) abuts against the sliding half-shaft (203) to form a whole shaft, the sliding shaft (205) abuts against the hollow track shaft (101) and slides, and the rotating sliding half-shaft (204) and the sliding half-shaft (203) abut against the hollow track half-shaft (102) and the rotating hollow track half-shaft (103) and slide; Through slots are provided on both sides of the hollow track shaft (101), and a through slot is provided on one side of the entire shaft formed by the hollow track half shaft (102) and the rotating hollow track half shaft (103), and the movable connecting device (2) slides against the through slot; The upper synchronous wheel (6) and the lower synchronous wheel (5) are connected to the hollow track shaft (101) through a bearing seat, a magnet block seat (12) is fixedly provided on the bearing seat of the lower synchronous wheel (5), a second magnet block (13) is fixedly provided on the magnet block seat (12), a first magnet block (304) is fixedly provided on the synchronous belt (3), and the second magnet block (13) is directly opposite to the first magnet block (304); The fixing seat (301) is arranged at the upper end of one side of the synchronous belt (3), and the first magnet block (304) is arranged at the lower end of the other side of the synchronous belt (3).

2. The mechanical device for real-time measurement of drilling depth according to claim 1, characterized in that: One end of the counting shaft (7) in the counting device (4) passes through the lower synchronous wheel (5) and abuts against the hollow track shaft (101) through the bearing seat, and the other end abuts against the derrick (1) through the bearing seat; An inner wheel (9) is provided between the lower synchronous wheel (5) and the counting shaft (7), the inner wheel (9) is fixed on the counting shaft (7), a ratchet (20) is provided in the lower synchronous wheel (5), a hinged pawl (18) is provided in the groove outside the inner wheel (9), one end of the pawl (18) is abutted in the groove by a torsion spring (19) and a pin shaft for rotation, and the pawl (18) abuts on the ratchet (20); During the drilling process, the pawl (18) is stuck on the ratchet wheel (20), thereby driving the inner wheel (9) and the counting shaft (7) to rotate through the lower synchronous wheel (5) to count; During the drilling process, the pawl (18) is disengaged from the ratchet (20) so that the inner wheel (9) and the counting shaft (7) remain stationary.

3. The mechanical device for real-time measurement of drilling depth according to claim 2, characterized in that: A counting driving wheel (8) and a plurality of reset counting driven wheels (10) are provided on the counting shaft (7), and a number ring (11) is provided on the reset counting driven wheel (10).

4. The mechanical device for real-time measurement of drilling depth according to claim 2, characterized in that: An auxiliary gear shaft (14) is provided on one side of the counting shaft (7), one end of the auxiliary gear shaft (14) abuts against the hollow track shaft (101) through the auxiliary gear shaft seat (17), and the other end abuts against the derrick (1) through the bearing seat; An auxiliary driving wheel (15) and a plurality of auxiliary driven wheels (16) are provided on the auxiliary gear shaft (14).

5. The mechanical device for real-time measurement of drilling depth according to claim 3, characterized in that: Both sides of the reset counting driven wheel (10) are provided with teeth, one side of the reset counting driven wheel (10) is fully toothed and the other side is provided with one tooth, and two adjacent reset counting driven wheels (10) are connected via an auxiliary driven wheel (16); The first reset counting driven wheel (10) rotates one circle, and the second reset counting driven wheel (10) rotates one tenth of a circle.

6. A method for using a mechanical device for real-time measurement of drilling depth according to any one of claims 1 to 5, wherein the method is as follows: S1, a faucet is connected to the drill pipe, and the faucet is clamped between a fixed clamp (201) and a rotating clamp (202); S2, when the faucet and the drill rod move downward, the synchronous belt (3) is driven to move, and at the same time, the lower synchronous wheel (5), the inner wheel (9) and the counting shaft (7) are driven to rotate, the counting driving wheel (8) drives the auxiliary driving wheel (15) to rotate, and the auxiliary driving wheel (15) drives the reset counting driven wheel (10) to rotate, and the gears are driven in sequence to count. The drilling depth is equal to the outer surface circumference of the lower synchronous wheel (5) multiplied by the counted number; S3. When the faucet moves upward, the lower synchronous wheel (5) does not act on the inner wheel (9) through the ratchet (20) and the pawl (18), so that the counting device (4) does not count; S4, repeat the drilling below, and the counting device (4) can accumulate the count to obtain the accurate drilling depth.

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