A water drilling machine facilitating three-speed adjustment

Abstract

This invention provides a water drill with convenient three-speed adjustment, including a gearbox housing, an intermediate connecting cover, a motor mounting housing, an output component, a drive component, a first transmission component, a second transmission component, and a speed regulating component. The first transmission component includes a first drive shaft, a main high-speed gear, a medium-speed clutch gear, and a main low-speed gear. The second transmission component includes a second drive shaft, a secondary high-speed gear, a medium-speed switching gear, a low-speed gear shaft, and an input gear. The speed regulating component includes a first clutch sheet metal, a second clutch sheet metal, and a shifting mechanism. The shifting mechanism uses a knob pin to eccentrically drive two sheet metals, causing the medium-speed clutch gear and the medium-speed switching gear to move axially synchronously. This invention, by setting an independent eccentric shifting mechanism, uses a knob pin to eccentrically drive two sets of clutch sheet metal, causing the medium-speed clutch gear and the medium-speed switching gear to move axially synchronously, quickly completing the switching of fast, medium, and slow speeds. The entire process does not require manual rotation of the output shaft to assist in shifting, making the shifting operation simple.

Description

Technical Field

[0001] This invention relates to the field of power tool technology, specifically to a water drill that is easy to adjust to three speeds. Background Technology

[0002] A water drill is a common power tool specifically designed for drilling holes, such as those for air conditioning units or fire escape routes. It works by using an electric motor to power an output shaft via a gear mechanism. This shaft rotates the output shaft, which then uses a drill bit to drill the hole. During drilling, external water enters the drill head through a water inlet tap to cool and lubricate it.

[0003] In actual construction, the requirements for drilling speed and torque vary greatly depending on the borehole diameter and the hardness of the substrate. Therefore, water drills need to have multi-speed adjustment capabilities to adapt to diverse construction conditions. Currently, most mainstream mechanical shift-type water drills on the market suffer from inconvenient shifting operations. Traditional shifting structures require operators to manually rotate the output shaft and adjust the shift knob to complete the gear change. At the construction site, the output shaft is affected by gear meshing and damping resistance, making manual rotation difficult, laborious, and lacking in feel.

[0004] Furthermore, due to the high torque of the machine, if the drill bit jams during operation, the machine can jerk backward and cause injury. Currently, the industry commonly uses a friction plate safety clutch for protection. This clutch relies on the static friction between the friction plate and the shim to lock the gear and output shaft, thus transmitting torque. When the drill bit stalls or the load torque exceeds the maximum static friction of the friction pair, the friction plate slips and idles, releasing the stall torque and preventing the machine from jerking backward. However, because it relies on friction, the friction plate will wear down over time, leading to rapid wear of the safety clutch and a decline in its long-term protective performance, reducing the overall reliability and practicality of the machine. Summary of the Invention

[0005] The purpose of this invention is to provide a water drill that is easy to adjust to three speeds, so as to solve the problems existing in the background art.

[0006] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution: A water drill rig with convenient three-speed adjustment includes a gearbox housing, an intermediate connecting cover, and a motor mounting housing connected in sequence. An output component is disposed between the gearbox housing and the intermediate connecting cover, and a drive component is disposed between the motor mounting housing and the intermediate connecting cover. A first transmission component, a second transmission component, and a speed regulating component are also disposed between the gearbox housing and the intermediate connecting cover. The first transmission component includes a first transmission shaft, on which a main high-speed gear, a medium-speed clutch gear, and a main low-speed gear are disposed. The second transmission component includes a second transmission shaft. The device is equipped with a secondary fast gear, a medium-speed switching gear, a slow-speed gear shaft, and an input gear. The speed regulating component includes a first clutch sheet metal, a second clutch sheet metal, and a shifting mechanism. The first and second clutch sheet metals are elastically clamped on the two end faces of the medium-speed clutch gear and the medium-speed switching gear, respectively, and the medium-speed clutch gear and the medium-speed switching gear are meshed together. The shifting mechanism drives the two sheet metals eccentrically through a knob pin, causing the medium-speed clutch gear and the medium-speed switching gear to move axially synchronously. The first rotating shaft is meshed with the output gear of the output component, and the input gear is meshed with the drive component.

[0007] Preferably, the aforementioned gear shifting mechanism includes a knob cover, a knob seat, and a knob pin. One end of the knob pin is eccentrically connected to the knob seat, and the other end is located between two clutch sheet metal parts. The knob seat has a positioning slide protruding on the side facing the knob cover. The knob seat is located inside the gearbox housing, and the positioning slide extends out of the gearbox housing and is movably connected to the knob cover. One end of the first clutch sheet metal part and the second clutch sheet metal part are connected by a first pin, and the other end is bent to form a first movable seat and a second movable seat, respectively. A second pin passes through the first movable seat and the second movable seat, and the second movable seat is movably passed through the first movable seat. The two ends of the first pin and the second pin are fixed to the gearbox housing and the intermediate connecting cover, respectively. A first spring is sleeved on the second pin, and one end of the first spring abuts against the first movable seat, and the other end abuts against the second movable seat.

[0008] Preferably, the outer surface of the knob cover has a raised rotating block, and the inner surface has a groove for moving the positioning slide. A connecting hole for limiting the connection of the positioning slide is formed between the groove and the rotating block. Positioning grooves are symmetrically formed on both sides of the groove. A first ball-head plunger is elastically disposed in the positioning groove. The gearbox housing has a mounting groove for rotating the knob cover. A mounting hole for connecting the knob seat is raised in the mounting groove. Four first limiting grooves for embedding the ball-head plunger are formed between the outer wall of the mounting hole and the inner wall of the mounting groove.

[0009] Preferably, the first movable seat is provided with a first limiting hole and a second limiting hole, the second movable seat is provided with a limiting block, one end of the second movable seat passes through the second limiting hole, and the first spring is located at the other end of the second movable seat and the end of the first movable seat close to the second limiting hole. The limiting block passes through the first limiting hole and moves back and forth along the first limiting hole.

[0010] Preferably, the two ends of the first and second drive shafts are respectively fixed to the gearbox housing and the intermediate connecting cover by bearings. The first drive shaft is provided with a gear segment for mounting a medium-speed clutch gear. The gear segment is provided with three limiting raceways at intervals, and each limiting raceway includes several second limiting grooves. The two ends of the medium-speed clutch gear are symmetrically provided with connecting seats, and one of the connecting seats is elastically provided with a second ball-head plunger embedded in the second limiting groove. The main fast gear and the main slow gear are both provided with connecting grooves for engaging the connecting seats on the side facing the medium-speed clutch gear. The second drive shaft is provided with a limiting segment for mounting a medium-speed switching gear. The limiting segment is provided with two annular positioning connecting parts at intervals, and the positioning connecting parts are provided with high and low tooth structures at intervals and crosses. The two sides of the medium-speed switching gear protrude to form connecting rings, and the inner wall of the connecting rings is provided with high and low tooth structures respectively.

[0011] Preferably, the connecting seat is provided with a series of locking blocks at intervals, and the connecting groove is designed with a corresponding locking block. A ramp is formed on one side wall of the locking block. Shims are provided on both sides of the main fast gear and the main slow gear. An oil stirring worm is also provided at one end of the second drive shaft fixed to the gearbox housing.

[0012] Preferably, an oil seal assembly is provided between the gearbox housing and the intermediate connecting cover. The oil seal assembly includes a first oil seal between the gearbox housing and the output shaft, a second oil seal between the output shaft and the intermediate connecting cover, and a third oil seal between the drive assembly and the intermediate connecting cover. An oil injection assembly is provided on the gearbox housing. The oil injection assembly includes an oil plug. The inner side of the oil plug protrudes to form a perforated mounting groove. A magnet is provided in the perforated mounting groove, and an O-ring is fitted on the outer side of the perforated mounting groove.

[0013] Preferably, the aforementioned drive assembly includes a stator assembly, a rotor assembly, and a drive shaft. The drive shaft is fixedly connected to the intermediate connecting cover and the motor mounting housing via bearings. The third oil seal is located between the drive shaft and the intermediate connecting cover. One end of the drive shaft is meshed with an input gear. The motor mounting housing is also provided with a fan blade and a fan blade baffle. The intermediate connecting cover is provided with a water inlet assembly. The motor mounting housing is provided with a control assembly, which includes a controller, a power switch button, a light panel assembly, and a power connection wire. The motor mounting housing is also provided with a handle on the outside.

[0014] Preferably, the aforementioned output assembly includes an output shaft, on which an output gear, a pressure plate, a second spring, and fasteners are sequentially arranged. The output gear is fixed to the output shaft by bearings. Two square-hole gaskets and three friction plates are arranged between the output gear and the pressure plate, with the square-hole gaskets and friction plates arranged alternately. The output shaft is fixed inside the gearbox housing by a first bearing and a second bearing, with one end of the output shaft extending out of the gearbox housing for operation. A dustproof gasket and a hole gasket are arranged inside the gearbox housing, located on the side of the first bearing facing the through hole in the gearbox housing. A shaft retaining ring is arranged on the other side of the first bearing. A first oil seal is located between the first bearing and the second bearing. A thrust gasket, a grooved gasket, and a friction plate are sequentially arranged between the second bearing and the output gear. A square-hole gasket and a friction plate are arranged between the output gear and the pressure plate. The output shaft is fixed inside the intermediate connecting cover by a third bearing. A stainless steel sleeve is arranged between the output shaft and the intermediate connecting cover. The second oil seal is located between the third bearing and the stainless steel sleeve. An O-ring is also fitted between the inner wall of the stainless steel sleeve and the outer wall of the output shaft.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention sets up an independent eccentric shifting mechanism, which drives two sets of clutch sheet metal through the eccentric drive of the knob pin, thereby driving the medium speed clutch gear and the medium speed switching gear to move axially synchronously, quickly completing the switching of three speeds: fast, medium and slow. There is no need to manually rotate the output shaft to assist in shifting throughout the process, which solves the problems of laborious shifting, sluggish operation and poor user experience of traditional water drills. The shifting operation is simple, efficient and labor-saving, which greatly improves the convenience of construction, improves the working efficiency of the machine, and enables the machine to quickly and accurately carry out effective operations in different environments. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram showing the partial positions and structures of the output component, speed regulation component, and transmission component in this invention; Figure 3 This is a schematic diagram of the partial location structure of the speed regulating component in this invention; Figure 4This is a schematic diagram of the disassembled structure of the transmission component in this invention; Figure 5 This is a schematic diagram showing the disassembled structure of the gearbox housing and the shifting mechanism in this invention; Figure 6 This is a schematic diagram of the knob cover structure in this invention; Figure 7 This is a schematic diagram of the oil injection assembly in this invention; Figure 8 This is a cross-sectional structural diagram of the present invention. Attached Figure

[0017] 1-Gearbox housing; 2-Intermediate connecting cover; 3-Motor mounting housing; 4-First drive shaft; 5-Main high-speed gear; 6-Medium-speed clutch gear; 7-Main slow-speed gear; 8-Second drive shaft; 9-Secondary high-speed gear; 10-Medium-speed switching gear; 11-Slow-speed gear shaft; 12-Input gear; 13-First clutch sheet metal; 14-Second clutch sheet metal; 15-Knob pin; 16-Knob cover; 17-Knob seat; 18-Positioning slide; 19-First pin; 20-First moving seat; 21-Second moving seat; 22-Second pin; 23-First spring; 24-Slide groove; 25-Positioning groove; 26-First ball plunger; 27-First limiting groove; 28-First limiting hole; 29-Second limiting hole; 30-Limit Positioning block; 31-Second limiting groove; 32-Second ball head plunger; 33-Positioning connection part; 34-Connecting ring; 35-Clocking block; 36-Clocking groove; 37-Oil stirring worm; 38-First oil seal; 39-Second oil seal; 40-Third oil seal; 41-Oil plug; 42-Magnet; 43-O-ring seal; 44-Stator assembly; 45-Rotor assembly; 46-Drive shaft; 47-Fan blade; 48-Fan blade baffle; 49-Handle; 50-Output shaft; 51-Output gear; 52-Pressure plate; 53-Second spring; 54-Fastener; 55-Square hole gasket; 56-Friction plate; 57-Dustproof gasket; 58-Hole gasket; 59-Shaft retaining ring; 60-Thrust gasket; 61-Groove gasket; 62-Stainless steel sleeve. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example

[0019] like Figure 1-8As shown, a water drill rig with convenient three-speed adjustment includes a gearbox housing 1, an intermediate connecting cover 2, and a motor mounting housing 3 connected in sequence. An output component is disposed between the gearbox housing 1 and the intermediate connecting cover 2, and a drive component is disposed between the motor mounting housing 3 and the intermediate connecting cover 2. A first transmission component, a second transmission component, and a speed regulating component are also disposed between the gearbox housing 1 and the intermediate connecting cover 2. The first transmission component includes a first transmission shaft 4, on which a main high-speed gear 5, a medium-speed clutch gear 6, and a main low-speed gear 7 are disposed. The second transmission component includes a second transmission shaft 8, on which a secondary high-speed gear is disposed. The gear assembly includes a gear 9, a medium-speed switching gear 10, a slow-speed gear shaft 11, and an input gear 12. The speed control assembly includes a first clutch sheet metal 13, a second clutch sheet metal 14, and a shifting mechanism. The first clutch sheet metal 13 and the second clutch sheet metal 14 are elastically clamped on the two end faces of the medium-speed clutch gear 6 and the medium-speed switching gear 10, respectively, and the medium-speed clutch gear 6 and the medium-speed switching gear 10 are meshed. The shifting mechanism drives the two sheet metals eccentrically through the knob pin 15 to drive the medium-speed clutch gear 6 and the medium-speed switching gear 10 to move axially synchronously. The first transmission shaft 4 is meshed with the output gear 51 of the output assembly, and the input gear 12 is meshed with the drive assembly.

[0020] This invention features an independent eccentric shifting mechanism. Operators only need to rotate the knob cover 16 to rotate the knob seat 17 and the eccentrically positioned knob pin 15. The knob pin 15 eccentrically pushes the first clutch sheet metal 13 and the second clutch sheet metal 14. Combined with the elastic restoring effect of the second pin shaft 22 and the first spring 23, this drives the medium-speed clutch gear 6 and the medium-speed switching gear 10 to move axially synchronously, changing the gear meshing state. This allows for quick switching between fast, medium, and slow speeds without rotating the output shaft. The entire process eliminates the need for manual rotation of the output shaft, solving the problems of laborious shifting, sluggish operation, and poor user experience associated with traditional water drills. The shifting operation is simple, efficient, and labor-saving. During operation, power is provided by the drive assembly, and after speed change via the dual transmission assembly, the drive output assembly drives the drill bit to drill holes, significantly improving construction convenience and machine efficiency, enabling the machine to perform effective operations quickly and accurately in different environments.

[0021] Specifically, the shifting mechanism includes a knob cover 16, a knob seat 17, and a knob pin 15. One end of the knob pin 15 is eccentrically connected to the knob seat 17, and the other end is located between the two clutch sheet metal parts. The knob seat 17 has a protruding positioning slide 18 on the side facing the knob cover 16. The knob seat 17 is located inside the gearbox housing 1, and the positioning slide 18 extends out of the gearbox housing 1 and is movably connected to the knob cover 16. One end of the first clutch sheet metal 13 and the second clutch sheet metal 14 are connected by a first pin 19, and the other ends are bent respectively. A first movable seat 20 and a second movable seat 21 are formed. A second pin 22 passes through the first movable seat 20 and the second movable seat 21, and the second movable seat 21 is movably mounted on the first movable seat 20. The two ends of the first pin 19 and the second pin 22 are respectively fixed to the gearbox housing 1 and the intermediate connecting cover 2. A first spring 23 is sleeved on the second pin 22, with one end of the first spring 23 abutting against the first movable seat 20 and the other end abutting against the second movable seat 21. The outer surface of the knob cover 16 is convex. The gearbox housing 1 has a handle block with a direction indicator. The inner surface of the handle block has a groove 24 for moving the positioning slide 18. A connecting hole for limiting the connection between the groove 24 and the rotating block is formed between the groove 24 and the positioning slide 18. Positioning grooves 25 are symmetrically formed on both sides of the groove 24. A first ball-head plunger 26 is elastically disposed within the positioning groove 25. The gearbox housing 1 has a mounting groove for rotating the knob cover 16. A mounting hole for connecting the knob seat 17 is formed within the mounting groove, and the outer wall of the mounting hole is flush with the mounting surface. Four first limiting grooves 27 are formed between the inner walls of the groove for the first ball-head plunger 26 to be inserted. The first moving seat 20 is provided with a first limiting hole 28 and a second limiting hole 29. The second moving seat 21 is provided with a limiting block 30. One end of the second moving seat 21 passes through the second limiting hole 29, and the first spring 23 is located at the other end of the second moving seat 21 and the end of the first moving seat 20 that is close to the second limiting hole 29. The limiting block 30 passes through the first limiting hole 28 and moves back and forth along the first limiting hole 28.

[0022] The above-mentioned shifting mechanism is simple in structure and easy to assemble. Specifically, pressing down the rotary block and pressing down the knob cover 16 causes the sliding groove 24 on the knob cover 16 to press down along the positioning slide 18, causing the positioning block on the knob cover 16 to press against the limiting groove. At this time, the first ball-head plunger 26 on the positioning block elastically retracts inward, and the positioning block can rotate along the mounting groove, thereby driving the knob seat 17 to rotate. Then, the knob pin 15 on the knob seat 17 first drives the second moving seat 21 to move axially until the limiting block 30 abuts against the first... When one end of the limiting hole 28 is in motion, the first moving seat 20 is moved simultaneously. The first moving seat 20 drives the clutch gear and the medium speed gear to move axially synchronously. When the knob cover 16 is turned to the corresponding indicated position (the gearbox housing 1 is marked with the corresponding gear position), the knob cover 16 is released and the knob cover 16 will pop outward, so that one end of the first ball head plunger 26 is embedded in the corresponding limiting groove. At this time, the medium speed clutch gear 6 completes the matching and replacement operation with the corresponding speed gear, realizing the machine's gear shifting and speed adjustment, which is convenient to operate.

[0023] Specifically, the first drive shaft 4 and the second drive shaft 8 are respectively fixed to the gearbox housing 1 and the intermediate connecting cover 2 by bearings at both ends. The first drive shaft 4 is provided with a gear section for mounting the medium-speed clutch gear 6. The gear section is provided with three limiting raceways at intervals, and each limiting raceway includes several second limiting grooves 31. The two ends of the medium-speed clutch gear 6 are symmetrically provided with connecting seats, and one of the connecting seats is elastically provided with a second ball-head plunger 32 embedded in the second limiting groove 31. The main fast gear 5 and the main slow gear 7 are both provided with connecting grooves for engaging the connecting seats on the side facing the medium-speed clutch gear 6. The second drive shaft 8 The upper part is provided with a limiting section for the movement of the medium speed switching gear 10. Two annular positioning connecting parts 33 are provided at intervals on the limiting section, and high and low tooth structures are provided at intervals on the positioning connecting parts 33. Connecting rings 34 are formed by protrusions on both sides of the medium speed switching gear 10. The inner wall of the connecting ring 34 is provided with high and low tooth structures. The connecting seat is provided with locking blocks 35 at intervals. The connecting groove is designed with locking slots 36 corresponding to the locking blocks 35. One side wall of the locking slot 36 forms a climbing slope. Gaskets are provided on both sides of the main fast gear 5 and the main slow gear 7. The second drive shaft 8 is fixed to one end of the gearbox housing 1 and is also provided with an oil stirring worm 37.

[0024] The above design, specifically the structural design between the first drive shaft 4 and the intermediate speed clutch gear 6, prevents the intermediate speed clutch gear 6 from axially wobbling back and forth on the output shaft 50, thereby further improving the stability of the water drill. The engagement relationship between the intermediate speed clutch gear 6 and the main fast gear 5 and the main slow gear 7 can be adjusted simply by operating the gear shifting mechanism, thus adjusting the working speed of the output shaft, making operation convenient. The high and low tooth structure specifically uses two types of teeth with alternating and cross-arranged heights, facilitating effective and precise meshing between the intermediate speed switching gear 10 and the positioning connection part 33 on the second drive shaft 8, enabling effective switching between different speed gears. The design of the ramp surface in the slot facilitates the fitting of the intermediate speed clutch gear 6 with the main fast gear 5 and the main slow gear 7, improving the flexibility of gear shifting operation. The design of the oil stirring worm 37 makes the liquid oil in the oil cavity formed between the gearbox housing 1 and the intermediate connecting cover 2 more uniform, improving the lubrication effect of the liquid oil on various components and ensuring the effective operation of the machine.

[0025] Specifically, an oil seal assembly is provided between the gearbox housing 1 and the intermediate connecting cover 2. The oil seal assembly includes a first oil seal 38 located between the gearbox housing 1 and the output shaft, a second oil seal 39 located between the output shaft and the intermediate connecting cover 2, and a third oil seal 40 located between the drive assembly and the intermediate connecting cover 2. An oil injection assembly is provided on the gearbox housing 1. The oil injection assembly includes an oil plug 41. The inner side of the oil plug 41 protrudes to form a perforated mounting groove. A magnet 42 is provided in the perforated mounting groove, and an O-ring seal 43 is fitted on the outer side of the perforated mounting groove.

[0026] In the above design, the gearbox housing 1 and the intermediate connecting cover 2 are connected by three oil seals to form a sealed cavity filled with liquid oil. By setting an oil plug 41 with a magnet 42, the magnet 42 can be used to attract iron filings in the liquid oil, such as wear iron filings generated by the meshing of gears. This can ensure the cleanliness of the liquid oil, reduce the frequency of oil changes, improve the lubrication effect on related parts, thereby reducing the frequency of maintenance and improving the effectiveness and service life of power tools.

[0027] Specifically, the drive assembly includes a stator assembly 44, a rotor assembly 45, and a drive shaft 46. The drive shaft 46 is fixedly connected to the intermediate connecting cover 2 and the motor mounting housing 3 via bearings. A third oil seal 40 is located between the drive shaft 46 and the intermediate connecting cover 2. One end of the drive shaft 46 is meshed with the input gear 12. The motor mounting housing 3 is also provided with a fan blade 47 and a fan blade baffle 48. A water inlet assembly is provided on the intermediate connecting cover 2. The motor mounting housing 3 is provided with a control assembly, which includes a controller, a power switch button, a light panel assembly, and a power connection wire. The motor mounting housing 3 is also provided with a handle 49 on the outside.

[0028] The above design has a simple structure. Through the cooperation of the input gear 12, the slow gear shaft 11 and the drive shaft 46, the drive shaft 46 can stably drive the second transmission shaft 8 to rotate. The design of the fan blade 47, fan blade baffle 48, water inlet assembly and control assembly can make the water drill more stable in use. The design of the handle 49 makes it easy to hold the water drill.

[0029] Specifically, the output assembly includes an output shaft 50, on which an output gear 51, a pressure plate 52, a second spring 53, and a fastener 54 are sequentially mounted. The output gear 51 is fixed to the output shaft 50 by bearings. Two square-hole washers 55 and three friction plates 56 are provided between the output gear 51 and the pressure plate 52, with the square-hole washers 55 and friction plates 56 arranged alternately. The output shaft 50 is fixed inside the gearbox housing 1 by a first bearing and a second bearing, with one end of the output shaft 50 extending out of the gearbox housing 1 for operation. A dustproof washer 57 and a hole washer 58 are provided inside the gearbox housing 1. The first bearing is located on the side facing the through hole of the gearbox housing 1. A shaft retaining ring 59 is provided on the other side of the first bearing. The first oil seal 38 is located between the first bearing and the second bearing. A thrust washer 60, a grooved washer 61 and a friction plate 55 are arranged in sequence between the second bearing and the output gear 51. The output shaft 50 is fixed in the intermediate connecting cover 2 by the third bearing. A stainless steel sleeve 62 is provided between the output shaft 50 and the intermediate connecting cover 2. The second oil seal 39 is located between the third bearing and the stainless steel sleeve 62. An O-ring 43 is also fitted between the inner wall of the stainless steel sleeve 62 and the outer wall of the output shaft 50.

[0030] The above design connects the output gear 51 to the output shaft 50 via bearings, making the synchronous rotation between the output gear 51 and the output shaft 50 more stable. By directly mounting a second spring 53 on the output shaft 50, compared to the existing use of compression springs, the second spring 53, due to its rectangular structure, has a large elastic stroke and a smaller fluctuation range than compression springs, which reduces wear on the friction plate 56 and provides more stable elastic compression of the output gear 51, thereby improving the machine's operational stability and service life. The design of washers, retaining rings, gaskets, friction plates, and other accessories at various positions improves the connection sealing, reduces wear on accessories, and reduces the risk of slippage of the output gear 51, thus making the synchronous rotation between the two more stable and improving the accuracy and safety of the machine's drilling.

[0031] It should be noted that the specific installation locations of the accessories involved in the control components and the specific design of the water inlet components can adopt the existing structure of the water drill, as well as conventional designs such as the carbon brush cover and rear cover on the motor mounting housing 3. In order to dissipate heat from the drive and control components, heat dissipation holes can be opened at corresponding positions on the side wall of the motor mounting housing 3 to improve the stability and service life of the tool. In order to improve the support stability of each bearing position, washers, retaining rings and other accessories can be installed. For positions involving sealing connections, screw accessories can be selected. Among them, the bearings at each position can be selected as needle roller bearings, ball bearings, etc., as needed to improve the connection sealing and stability, thereby improving the stability, accuracy and safety of the tool. Further details will not be elaborated here.

[0032] When this invention is in operation, the motor drives the drive shaft 46 to rotate, and the power is transmitted to the second transmission shaft 8 through the input gear 12. The second transmission shaft 8 forms different gear meshing ratios with the first transmission shaft 4 according to different gear positions. Finally, the first transmission shaft 4 drives the output gear 51, the output shaft 50, and the drill bit to rotate, completing the drilling operation. Specifically: Slow gear to medium gear: Rotate the knob cover 16 clockwise. Due to the eccentric structure design, the knob pin 15 will rotate counterclockwise, pressing the second clutch sheet metal 14 forward. Since the second clutch sheet metal 14 and the first clutch sheet metal 13 are provided with a first spring 23, when the second clutch sheet metal 14 moves forward, the first spring 23 is compressed and pulls the first clutch sheet metal 13. At this moment, the first clutch sheet metal 13 also pulls the medium speed clutch gear 6 and the medium speed switching gear 10 forward together. When the first ball head plunger 26 on the medium speed clutch gear 6 enters the first limit groove 27, the high and low tooth structure in the two-end connecting ring 34 of the medium speed switching gear 10 simultaneously enters the two high and low tooth structures on the second transmission shaft 8. At this moment, the medium speed gear switching is completed.

[0033] Similarly, when switching from medium to high speed, the knob cover 16 rotates clockwise, pushing the two sheet metal parts forward. When the medium speed clutch gear 6 and the main high speed gear 5 mesh, the high speed gear shift is achieved. When switching from high to medium speed, the knob cover 16 rotates counterclockwise, the medium speed clutch gear 6 disengages from the main high speed gear 5, and the high and low gear structures in the connecting rings 34 at both ends of the medium speed switching gear 10 simultaneously enter the two high and low gear structures on the second transmission shaft 8, thus completing the medium speed gear shift. When switching from medium to low speed, the knob cover 16 rotates counterclockwise, the medium speed clutch gear 10 and the main low speed gear 7 mesh, thus achieving the low speed gear shift.

[0034] It should be noted that during the shift from medium speed to fast speed and from medium speed to slow speed, during the meshing process of the medium speed clutch gear 6 and the main fast gear 5, and the medium speed clutch gear 6 and the main slow gear 7, the surface of the medium speed clutch gear 6 will first touch the surface of the main fast gear 5 or the main slow gear 7. At this time, they are not actually meshed, but the knob cover 16 has been rotated to the corresponding gear position. The first spring 23 (cylindrical spring) between the two sheet metal parts will always exert an axial force on the medium speed clutch gear 6, causing the medium speed clutch gear 6 to mesh with the corresponding shift gear. At this time, as soon as the machine is turned on, the first drive shaft 4 (gear shaft) will drive the medium speed clutch gear 6 to rotate. The design of the ramp slope in the slot on the main fast paper wheel 5 and the main slow gear 7 is to facilitate the surface of the card block 35 on the medium speed clutch gear 6 to slide over the surface of the card slot 36 on the main fast gear 5 or the main slow gear 7 to achieve meshing and connection, thus achieving precise gear switching.

[0035] Similarly, when switching from fast to medium speed or from slow to medium speed, that is, during the meshing connection of the medium speed switching gear 10 and the second drive shaft 8, the tooth surface inside the connecting ring 34 on the medium speed switching gear 10 first contacts the tooth surface on the positioning connection part 33 on the second drive shaft 8. Since both the medium speed switching gear 10 and the second drive shaft 8 use a high-low tooth structure, as soon as the machine is turned on, the tooth surface on the medium speed switching gear 10 can slide over the tooth surface on the second drive shaft 8, achieving a fast and effective meshing connection and realizing precise gear switching. Because the water drill rotates at a relatively high speed, if both the medium speed switching gear 10 and the second drive shaft 8 use a tooth structure of the same height, it is easy for the tooth surfaces to abut and slide past each other, resulting in the teeth not meshing properly and causing problems such as jamming. Therefore, using a high-low tooth structure can effectively solve this problem, improve the corresponding gear shifting effect, and thus improve the usability of the water drill.

[0036] The above are merely preferred embodiments of the present invention and are not intended to limit the implementation methods and protection scope of the present invention. Those skilled in the art should recognize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present invention should be included within the protection scope of the present invention.

Claims

1. A water drill rig with easily adjustable three speeds, comprising a gearbox housing, an intermediate connecting cover, and a motor mounting housing connected in sequence, wherein an output component is disposed between the gearbox housing and the intermediate connecting cover, and a drive component is disposed between the motor mounting housing and the intermediate connecting cover, characterized in that: A first transmission assembly, a second transmission assembly, and a speed regulating assembly are further provided between the gearbox housing and the intermediate connecting cover. The first transmission assembly includes a first transmission shaft on which a main high-speed gear, a medium-speed clutch gear, and a main low-speed gear are mounted. The second transmission assembly includes a second transmission shaft on which a secondary high-speed gear, a medium-speed switching gear, a low-speed gear shaft, and an input gear are mounted. The speed regulating assembly includes a first clutch sheet metal, a second clutch sheet metal, and a shifting mechanism. The first and second clutch sheet metals are elastically clamped on the two end faces of the medium-speed clutch gear and the medium-speed switching gear, respectively, and the medium-speed clutch gear and the medium-speed switching gear are meshed. The shifting mechanism drives the two sheet metals eccentrically via a knob pin, causing the medium-speed clutch gear and the medium-speed switching gear to move axially synchronously. The first rotating shaft is meshed with the output gear of the output assembly, and the input gear is meshed with the drive assembly.

2. The water drill rig with convenient three-speed adjustment according to claim 1, characterized in that: The shifting mechanism includes a knob cover, a knob seat, and a knob pin. One end of the knob pin is eccentrically connected to the knob seat, and the other end is located between two clutch sheet metal parts. The knob seat has a locating slide protruding on the side facing the knob cover. The knob seat is located inside the gearbox housing, and the locating slide protrudes through the gearbox housing and is movably connected to the knob cover. One end of the first clutch sheet metal part and the second clutch sheet metal part are connected by a first pin, and the other end is bent to form a first moving seat and a second moving seat, respectively. A second pin is inserted between the first moving seat and the second moving seat, and the second moving seat is movably inserted on the first moving seat. The two ends of the first pin and the second pin are fixed to the gearbox housing and the intermediate connecting cover, respectively. A first spring is sleeved on the second pin, and one end of the first spring abuts against the first moving seat, and the other end abuts against the second moving seat.

3. A water drill rig with easily adjustable three speeds according to claim 2, characterized in that: The outer surface of the knob cover has a raised rotating block, and the inner surface has a groove for moving the positioning slide. A connecting hole for limiting the connection of the positioning slide is formed between the groove and the rotating block. Positioning grooves are symmetrically formed on both sides of the groove. A first ball-head plunger is elastically disposed in the positioning groove. The gearbox housing has a mounting groove for rotating the knob cover. A mounting hole for connecting the knob seat is raised in the mounting groove. Four first limiting grooves for the ball-head plunger to be inserted are formed between the outer wall of the mounting hole and the inner wall of the mounting groove.

4. A water drill rig with easily adjustable three speeds according to claim 3, characterized in that: The first movable seat is provided with a first limiting hole and a second limiting hole, and the second movable seat is provided with a limiting block. One end of the second movable seat passes through the second limiting hole, and the first spring is located at the other end of the second movable seat and the end of the first movable seat that is close to the second limiting hole. The limiting block passes through the first limiting hole and moves back and forth along the first limiting hole.

5. A water drill rig with easily adjustable three speeds according to claim 1, characterized in that: The first and second drive shafts are respectively fixed to the gearbox housing and the intermediate connecting cover by bearings at both ends. The first drive shaft is provided with a gear section for mounting a medium-speed clutch gear. The gear section is provided with three limiting raceways at intervals, and each limiting raceway includes several second limiting grooves. The two ends of the medium-speed clutch gear are symmetrically provided with connecting seats, and one of the connecting seats is elastically provided with a second ball-head plunger embedded in the second limiting groove. The main fast gear and the main slow gear are both provided with connecting grooves for engaging the connecting seats on the side facing the medium-speed clutch gear. The second drive shaft is provided with a limiting section for mounting a medium-speed switching gear. The limiting section is provided with two annular positioning connecting parts at intervals, and the positioning connecting parts are provided with high and low tooth structures at intervals and crosses. The two sides of the medium-speed switching gear protrude to form connecting rings, and the inner wall of the connecting rings is provided with high and low tooth structures respectively.

6. A water drill rig with easily adjustable three speeds according to claim 5, characterized in that: The connecting seat is provided with a series of locking blocks at intervals, and the connecting groove is designed with a corresponding locking slot. One side wall of the locking slot is formed with a ramp. Both sides of the main fast gear and the main slow gear are provided with shims. The second drive shaft is fixed to one end of the gearbox housing and is also provided with an oil stirring worm.

7. A water drill rig with easily adjustable three speeds according to claim 1, characterized in that: An oil seal assembly is provided between the gearbox housing and the intermediate connecting cover. The oil seal assembly includes a first oil seal between the gearbox housing and the output shaft, a second oil seal between the output shaft and the intermediate connecting cover, and a third oil seal between the drive assembly and the intermediate connecting cover. An oil injection assembly is provided on the gearbox housing. The oil injection assembly includes an oil plug. The inner side of the oil plug protrudes to form a perforated mounting groove. A magnet is provided in the perforated mounting groove, and an O-ring is fitted on the outer side of the perforated mounting groove.

8. A water drill rig with easily adjustable three speeds according to claim 7, characterized in that: The drive assembly includes a stator assembly, a rotor assembly, and a drive shaft. The drive shaft is fixedly connected to the intermediate connecting cover and the motor mounting housing via bearings. The third oil seal is located between the drive shaft and the intermediate connecting cover. One end of the drive shaft is meshed with an input gear. The motor mounting housing also contains a fan blade and a fan blade baffle. The intermediate connecting cover is equipped with a water inlet assembly. The motor mounting housing contains a control assembly, which includes a controller, a power switch button, a light panel assembly, and a power connection wire. The motor mounting housing also has a handle on its exterior.

9. A water drill rig with easily adjustable three speeds according to claim 7, characterized in that: The output assembly includes an output shaft, on which an output gear, a pressure plate, a second spring, and fasteners are sequentially arranged. The output gear is fixed to the output shaft by bearings. Two square-hole gaskets and three friction plates are arranged between the output gear and the pressure plate, with the square-hole gaskets and friction plates arranged alternately. The output shaft is fixed inside the gearbox housing by a first bearing and a second bearing, with one end of the output shaft extending out of the gearbox housing for operation. A dustproof gasket and a hole gasket are arranged inside the gearbox housing, located on the side of the first bearing facing the through hole in the gearbox housing. A shaft retaining ring is arranged on the other side of the first bearing. A first oil seal is located between the first bearing and the second bearing. Between the second bearing and the output gear, a thrust gasket, a grooved gasket, and a friction plate are sequentially arranged. Between the output gear and the pressure plate, a square-hole gasket and a friction plate are arranged. The output shaft is fixed inside the intermediate connecting cover by a third bearing. A stainless steel sleeve is arranged between the output shaft and the intermediate connecting cover. The second oil seal is located between the third bearing and the stainless steel sleeve. An O-ring is also fitted between the inner wall of the stainless steel sleeve and the outer wall of the output shaft.

Images