Multi-position power tool driving device and multi-position power tool

Abstract

A multi-position power tool driving device (10), comprising a mounting sleeve (13); a jaw holder (12); a working mechanism (20) movably arranged on the jaw holder and having at least a first initial position, a second initial position, and a full-stroke position; and a control module having at least a first mode and a second mode respectively corresponding to the first initial position and the second initial position, wherein the distance from the first initial position to the full-stroke position is less than or greater than the distance from the second initial position to the full-stroke position. Also provided is a multi-position power tool. By using the driving device, the working mechanism can, during work, select to work at the first initial position or the second initial position depending on working members of different sizes, thereby being applicable to a variety of working members of different sizes, reducing the working duration of the working members , and improving working efficiency.

Description

Multi-stage power tool drive unit and multi-stage power tools Technical Field

[0001] This invention belongs to the field of power tool technology, specifically relating to a multi-stage power tool drive device and a multi-stage power tool. Background Technology

[0002] Power tools are tools powered by an electric motor that use a transmission mechanism to drive a working head at the front end to perform operations. In pipeline and power construction work, different working heads can be equipped to achieve different functions, such as electric crimping tools, electric pipe expanders, and electric shearing tools. Taking an electric crimping tool as an example, it generally consists of a power supply, a motor drive mechanism, and crimping pliers. The power supply provides power to the motor drive mechanism and controls the motor drive mechanism to start, thereby driving the crimping pliers to perform the crimping work on the pipe.

[0003] Existing power tools, such as the vertical electric crimping tool disclosed in the applicant's prior invention patent application CN116810725A, have a lead screw, a reducer connected to the lead screw, and a motor connected to the reducer within their main body. During operation, the motor drives the reducer and the lead screw to rotate. A movable sleeve on the lead screw moves a push rod along the axial direction of the lead screw, thereby moving a roller seat and roller on the push rod. The roller acts on the crimping clamp, causing the upper end of the crimping clamp to gradually close, thus crimping the pipe fitting. The push rod, movable sleeve, and rollers have initial positions during movement; each operation starts from this initial position until the workpiece is finished, then returns to the initial position to prepare for the next operation. In this patent, since there is only one initial position, the size of the working parts (such as crimping pliers) that this type of power tool can be adapted to is relatively limited, and the applicable scenarios are also relatively limited. Furthermore, when using small working parts (such as calipers with short arms), since it is still necessary to start from the initial position when working, the idle stroke during the process is long, which wastes time and easily leads to low work efficiency. Summary of the Invention

[0004] To address the aforementioned problems, the present invention provides a multi-stage power tool drive device and a multi-stage power tool with a working mechanism having at least two initial positions, to adapt to working parts of different sizes.

[0005] The present invention adopts the following technical solution:

[0006] This invention proposes a multi-stage power tool drive device, which is installed in a multi-stage power tool and features the following characteristics: a mounting sleeve; a plier head seat mounted on the mounting sleeve; a working mechanism movably mounted on the plier head seat and having at least a first initial position, a second initial position, and a full-stroke position; and a control module having at least a first mode and a second mode corresponding to the first and second initial positions, respectively; when in the first mode, the working mechanism operates from the first initial position; when in the second mode, the working mechanism operates from the second initial position; and when the working mechanism is not in the first initial position but the control module is in the first mode, the working mechanism moves from its current position to the first initial position and then starts working; when the working mechanism is not in the second initial position but the control module is in the second mode, the working mechanism moves from its current position to the second initial position and then starts working; the distance from the first initial position to the full-stroke position is less than or greater than the distance from the second initial position to the full-stroke position.

[0007] The multi-stage power tool drive device proposed in this invention also includes: a pushing mechanism mounted on a mounting sleeve for driving the working mechanism to move; a sensing mechanism having a sensor and a sensing element; wherein the pushing mechanism has: a lead screw rotatably disposed inside the mounting sleeve; a movable sleeve movably sleeved on the outside of the lead screw and connected to the working mechanism; and a motor assembly for driving the lead screw to rotate, during which the lead screw drives the movable sleeve to move axially; the sensing element is mounted on the end of the movable sleeve away from the working mechanism, and the sensor is mounted on the mounting sleeve.

[0008] The multi-stage power tool drive device proposed in this invention also has the feature that the sensor has at least a first sensing point and a second sensing point.

[0009] The multi-stage power tool drive device proposed in this invention also features a motor assembly comprising: a motor connected to a control module; a reducer coupled to a lead screw; the motor and reducer are coaxially arranged or the motor is inverted beside the reducer; wherein, when the motor is inverted beside the reducer, the motor assembly further comprises a linkage installed between the motor and the reducer, and a drive seat for enclosing the linkage; the drive seat comprises: a connecting flange containing a first mounting portion for mounting the motor and a second mounting portion for mounting the reducer; an end cover covering the bottom of the connecting flange; a receiving cavity for accommodating the linkage is formed between the end cover and the connecting flange; the linkage comprises: a motor output wheel mounted on the motor shaft; a reducer input wheel connected to the reducer; and an idler wheel connecting the motor output wheel and the reducer input wheel.

[0010] The multi-stage power tool drive device proposed in this invention also has the following features: a needle roller bearing is embedded in the middle of the idler wheel, and a mounting shaft is provided in the middle of the needle roller bearing. One end of the mounting shaft is inserted into the connecting flange, and the other end is inserted into the end cover. Gaskets are provided between the two end faces of the idler wheel and the connecting flange and the end cover, respectively.

[0011] The multi-stage power tool drive device proposed in this invention also has the following features: the mounting sleeve has: a lead screw mounting part for mounting the lead screw, and a speed reduction mounting part integrally formed with the lead screw mounting part for mounting the speed reducer; the lead screw mounting part includes: a guide part with a guide groove on its inner wall that mates with the movable sleeve, and a mounting part with a mounting step inside for mounting the lead screw.

[0012] The multi-stage power tool drive device proposed in this invention also has the following features: the working mechanism has a roller seat and a pair of rollers mounted on the roller seat; the movable sleeve has: a push rod, one end of which extends into the mounting sleeve and is sleeved on the outer periphery of the lead screw, and the other end extends out of the mounting sleeve and is fixed to the roller seat; a lead screw nut, which is movably sleeved on the outer periphery of the lead screw and is integrally or separately configured with the end of the push rod away from the roller seat; wherein a sensing element is installed on the outer peripheral surface of the lead screw nut.

[0013] The multi-stage power tool drive device proposed in this invention also has the feature that the top of the mounting sleeve is provided with a schematic recess, which is aligned with the sensor in the axial direction.

[0014] The multi-stage power tool drive device proposed in this invention also has the following features: a protective sleeve is slidably provided on the outer periphery of the pliers head seat; the pliers head seat is provided with a limiting steel ball and a return spring; and the protective sleeve is provided with at least two limiting holes arranged along the sliding direction and cooperating with the limiting steel ball.

[0015] The present invention also proposes a multi-stage power tool, characterized by comprising: a working part, a housing, wherein a multi-stage power tool drive device as described above is installed therein, and the working part is detachably mounted on an exposed portion of the pliers head extending out of the housing.

[0016] The multi-stage power tool proposed in this invention also has the following feature: the working parts include at least two working parts of different sizes, and one of the at least two working parts is installed on the exposed part.

[0017] The multi-stage power tool proposed in this invention also has the following features: a mounting sleeve is installed inside the housing; one end of the plier head extends into the housing and is rotatably connected to the mounting sleeve; the other end extends out of the housing; a limiting member is provided on the side of the plier head; a central hole is provided on the top of the housing for the plier head to extend out; the edge of the central hole extends inward to form a limiting protrusion; the limiting protrusion and the projection of the limiting member in the axial direction have an overlapping portion; or, a protruding limiting protrusion is provided on the inner wall of the housing; the limiting member can abut against the limiting protrusion during the rotation of the plier head.

[0018] Invention Function and Effect

[0019] According to the multi-stage power tool drive device and multi-stage power tool of the present invention, since the working mechanism has at least two initial positions (first initial position and second initial position) and the control module is correspondingly provided with at least two modes (first mode and second mode), the working mechanism can select the first initial position or the second initial position to work for different sized working parts (such as calipers with different arm lengths) during operation. On the one hand, it is applicable to a variety of different sized working parts, and on the other hand, it can save the working time of the working parts and improve work efficiency. Attached Figure Description

[0020] Figure 1 is a structural diagram of the multi-segment power tool drive device of the present invention when the working parts are installed.

[0021] Figure 2 is a cross-sectional view of the multi-segment power tool drive device of Embodiment 1 of the present invention.

[0022] Figure 3 is a cross-sectional view of the motor and reducer installation structure of Embodiment 1 of the present invention.

[0023] Figure 5 is an exploded view of the motor and reducer mounting structure of the present invention.

[0024] Figure 5 is a simplified structural diagram of the lead screw in Embodiment 1 of the present invention.

[0025] Figure 6 is a cross-sectional view of the movable sleeve installation structure of Embodiment 1 of the present invention.

[0026] Figure 7 is a simplified structural diagram of the sensor in Embodiment 1 of the present invention.

[0027] Figure 8 is a simplified structural diagram of the lead screw nut of the present invention.

[0028] Figure 9 is a simplified structural diagram of the mounting sleeve of the present invention.

[0029] Figure 10 is a cross-sectional view of the installation structure of the clamp head base and the outer shell in Embodiment 1 of the present invention.

[0030] Figure 11 is a simplified diagram of the installation structure of the clamp head base and protective sleeve in Embodiment 2 of the present invention.

[0031] Figure 12 is one of the axial cross-sectional views of the installation structure of the clamp head seat and protective sleeve in Embodiment 2 of the present invention.

[0032] Figure 13 is the second axial cross-sectional view of the installation structure of the clamp head seat and protective sleeve in Embodiment 2 of the present invention.

[0033] Figure 14 is a radial cross-sectional view of the installation structure of the clamp head seat and protective sleeve in Embodiment 2 of the present invention.

[0034] Figure 15 is a cross-sectional view of the lead screw installation structure of Embodiment 4 of the present invention.

[0035] Figure 16 is a cross-sectional view of the installation structure of the clamp head base and the outer shell in Embodiment 5 of the present invention.

[0036] Figure 17 is a schematic diagram of the installation structure of the working components in Embodiment 7 of the present invention.

[0037] Figure 18 is a cross-sectional view of the installation structure of the working component in Embodiment 7 of the present invention.

[0038] Reference numerals: Drive unit 10, housing 11, center hole 111, limiting flange 112, clamp head seat 12, mounting section 121, limiting element 122, I-shaped opening slot 123, mounting sleeve 13, lead screw mounting part 131, guide part 1311, mounting part 1312, guide groove 1313, mounting step 1314, mounting notch 1315, deceleration mounting part 132, schematic recess 133, positioning groove 134, protective sleeve 14, limiting hole 141, limiting groove 142, limiting steel 151. Ball 152. Return spring 153. Limiting steel ball 154. Handle 16. Groove 161. Working mechanism 20. Roller seat 21. Roller 22. Screw 23. Pushing mechanism 30. Lead screw 31. Mounting plate 32. Large end 32a. Small end 32b. Threaded section 311. Flat thrust bearing 331. Deep groove ball bearing 332. Push rod 34. Connector 341. Insertion end 342. Lead screw nut 35. Through hole 351. Mounting groove 352. Acting surface 353. Spiral groove 354. Mounting hole 3 55. Reversing device; 356. Slot; 357. Slide bar; 358. Limiting clip; 37. Bearing; 38. Ball bearing; 39. Crimping pliers; 40. Clamping arm; 41. Notch; 42. Connecting plate; 43. Motor assembly; 50. Motor; 51. Motor shaft; 511. Air inlet; 512. Air outlet; 513. Reducer; 52. First-stage internal gear ring; 521. Second and third-stage internal gear rings; 522. First-stage planetary carrier; 523. First-stage planetary gear; 524. Second-stage planetary carrier; 525. Second-stage planetary gear; 526. Third-stage planetary carrier; 527. Third-stage planetary gear. Gear 528, motor output wheel 53, reducer input wheel 54, idler wheel 55, mounting shaft 551, needle roller bearing 552, gasket 553, drive seat 56, connecting flange 561, first mounting part 5611, second mounting part 5612, end cover 562, sensing mechanism 60, sensing element 61, sensor 62, screw 621, first sensing point 622, second sensing point 623, pin 71, limiting groove 711, limiting block 72, limiting button 73, limiting hook 731, spring 74. Detailed Implementation

[0039] To make the technical means, creative features, objectives and effects of the present invention easy to understand, the following describes the multi-stage power tool drive device and multi-stage power tool of the present invention in detail with reference to embodiments and accompanying drawings.

[0040] <Example 1>

[0041] This embodiment proposes a multi-stage power tool, which includes a drive unit 10, a housing 11, and a working part, as shown in Figure 1. The working part is a crimping pliers 40 (which can also be a shearing pliers, a clamp, etc.). The crimping pliers 40 is detachably installed at the front end of the drive unit 10 and can perform crimping workpieces such as pipes under the drive of the drive unit 10.

[0042] As shown in Figures 1 and 2, the drive device 10 includes at least a housing 11 (not shown in the figures), a clamp head seat 12 for mounting the crimping clamp 40, a mounting sleeve 13, a working mechanism 20 acting on the crimping clamp 40, a pushing mechanism 30 for pushing the working mechanism 20, a motor assembly 50 for controlling the rotation of the lead screw of the pushing mechanism 30, a control module, a sensing mechanism 60, a power supply, a control switch, and buttons. In this embodiment, the housing 11 is a vertically extending shell formed by two front and rear half-shells fixed together by screws. It is hollow inside and used to mount the mounting sleeve 13, the motor assembly 50, and the control module. The clamp head seat 12 is mounted at the front end (which can be the top) of the housing 11, and the control module is mounted at the rear end (which can be the bottom) of the housing 11. The power supply is detachably mounted on the housing 11 and is located at the bottom of the control module. The button is located on the housing 11. A control switch (such as a micro switch) is installed inside the housing 11. The control switch is electrically connected to the control module via wires. The internal control switch is turned on by pressing the button (the connection between the control switch, the button and the control module is existing technology and will not be described in detail here).

[0043] With the vertical direction as the reference, the components arranged from top to bottom are: working mechanism 20, pushing mechanism 30, motor assembly 50, control module, and power supply. Among them, the working mechanism 20 has a pair of rollers 22 for acting on the crimping pliers 40 and roller seats 21 for mounting the rollers 22. The roller seats 21 and the pair of rollers 22 are mounted in the plier head seat 12, and the roller seats 21 can move along the axis of the plier head seat 12 with the pair of rollers 22 under the action of the pushing mechanism 30. As shown in Figure 1, the crimping pliers 40 have a pair of symmetrically arranged clamping arms 41 and a pair of symmetrically arranged connecting plates 43. A notch 42 for clamping the workpiece is formed between the front ends of the pair of clamping arms 41. The tail ends of the pair of clamping arms 41 correspond to a pair of rollers 22. The pair of connecting plates 43 are symmetrically arranged on both sides of the clamping arms 41 to connect the two clamping arms 41 together. The pair of clamping arms 41 can rotate under the push of the pair of rollers 22, thereby crimping the workpiece within the notch 42. One end of the clamp head seat 12 extends into the housing 11 and is provided with a mounting section 121 for rotatably connecting with the mounting sleeve 13. The other end extends out of the housing 11 and is detachably connected to the crimping pliers 40, facilitating the disassembly and replacement of the crimping pliers 40. The caliper arm has a pivot point in the middle, meaning that a single caliper arm can rotate around the pivot point in the middle. The caliper arm is divided into an upper part (i.e., the part where the notch 42 is located) and a lower part by the pivot point. The upper part is the working part and the lower part is the force-applying part. During the movement, the roller 22 can act on the inside of the force-applying part, so that the two working parts rotate inward relative to each other and gradually close. The caliper arm acts on the workpiece using a lever-like principle.

[0044] The pushing mechanism 30 is mounted on the mounting sleeve 13, and its front end extends out of the mounting sleeve 13 and connects to the roller seat 21 of the working mechanism 20. Specifically, as shown in Figure 2, the pushing mechanism 30 includes a lead screw 31 and a movable sleeve sleeved on the outside of the lead screw 31 for moving the roller seat 21. The lead screw 31 is mounted inside the mounting sleeve 13 and can rotate under the drive of the motor assembly 50. The lead screw 31 has a threaded section 311 formed on its outer circumference, and the movable sleeve is sleeved on the threaded section 311. During the rotation of the lead screw 31, the movable sleeve moves axially along the lead screw 31 under the action of the threaded section 311. The outer end of the movable sleeve extends out of the mounting sleeve 13 and is fixed to the roller seat 21. During the axial movement, the movable sleeve drives the roller seat 21 and the roller 22 to move and roll axially, thereby realizing the operation of the crimping pliers 40.

[0045] In this embodiment, the motor assembly 50 includes a motor 51, a reducer 52, a linkage, and a drive seat 56 for mounting the motor 51 and the linkage. The reducer 52 is installed inside the mounting sleeve 13, with one end connected to the lead screw 31 and the other end connected to the motor 51 via the linkage. The motor 51 is electrically connected to a controller, which controls the motor 51 to operate. The lead screw 31 rotates under the drive of the motor 51 and the reducer 52. Specifically, as shown in FIG2, the motor 51 is inverted beside the mounting sleeve 13, and the axis of the motor 51 is parallel to the axis of the mounting sleeve 13 (or the lead screw 31). As shown in FIG3 and FIG4, the linkage includes a motor output wheel 53 mounted on the motor shaft 511 of the motor 51, a reducer input wheel 54 connected to the reducer 52, and an idler wheel 55 connecting the motor output wheel 53 and the reducer input wheel 54. The drive base 56 has a connecting flange 561 and an end cover 562 fixed by screws. The connecting flange 561 has a first mounting portion 5611 for mounting the motor 51 and a second mounting portion 5612 for mounting the reducer 52 (or mounting sleeve 13). The end cover 562 covers the bottom of the connecting flange 561, and a receiving cavity for accommodating the linkage is formed between the end cover 562 and the connecting flange 561. The motor output wheel 53 is a gear, and the reducer input wheel 54 is a first-stage sun gear. The middle part of the reducer input wheel 54 extends towards the reducer 52 to form an output end 541. The output end 541 passes through the second mounting part 5612 to form an output gear and connects with the reducer 52. A bearing 542 is provided between the output end 541 and the second mounting part 5612. A central through hole is axially opened in the middle of the reducer input wheel 54. A rotating shaft 543 is installed at the bottom of the central through hole. The upper end of the rotating shaft 541 is inserted into the central through hole, and the lower end is inserted into the end cover 562. A bearing 542 is provided between the rotating shaft 541 and the end cover 562.

[0046] The first mounting part 5611 has a hole in the middle for the motor shaft 511 to pass through. After passing through the hole, the motor shaft 511 extends into the receiving cavity and is equipped with a motor output wheel 53. The second mounting part 5612 has a mounting sleeve 13 fixed above it by screws. The second mounting part 5612 also has a hole in the middle for the main shaft of the reducer input wheel 54 to pass through. After passing through the hole, the main shaft of the reducer input wheel 54 is inserted into the reducer 52. The idler wheel 55 is mounted between the motor output wheel 53 and the reducer input wheel 54 via the mounting shaft 551. The two sides of the idler wheel 55 are respectively engaged with the motor output wheel 53 and the reducer input wheel 54. One end of the mounting shaft 551 is inserted into the connecting flange 561 (located between the first mounting part 5611 and the second mounting part 5612), and the other end is inserted into the end cover 562. A needle roller bearing 552 is also provided between the outer periphery of the mounting shaft 551 and the center hole of the idler wheel 55. Gaskets 553 are provided between the two end faces of the idler wheel 55 and the connecting flange 561 and the end cover 562 respectively to prevent contact wear between the idler wheel 55 and the connecting flange 561 and the end cover 562.

[0047] In this embodiment, as shown in Figures 2 and 8, the mounting sleeve 13 is an integral sleeve structure with a lead screw mounting part 131 and a reduction gear mounting part 132. The lead screw mounting part 131 is used to install the lead screw 31, and the reduction gear mounting part 132 is integrally set with the lead screw mounting part 131 and is used to install the reducer 52. That is to say, the gearbox housing for installing the reducer 52 and the mounting housing for installing the lead screw 31 are made into an integral structure, which greatly simplifies the installation structure, reduces costs, and makes the structure more compact and stable, which is conducive to product miniaturization and weight reduction. In addition, the bottom of the mounting sleeve 13 is mounted on the connecting flange 561 of the drive seat 56. The mounting sleeve 13 encloses the lead screw 31 and the reducer 52 inside, and the drive seat 56 encloses the linkage inside. The relatively enclosed structure allows the tool to ensure reliable operation even in relatively harsh pipeline construction environments with dust, mud, sand and metal shavings. Meanwhile, the gears and bearings inside the drive housing 56 are lubricated with grease, and the drive housing 56 forms a closed space, so the grease is not easy to leak out, thus ensuring the lubrication conditions of the gear transmission parts.

[0048] In this embodiment, the control motor 51 is a sensorless brushless motor. Compared to traditional sensored motors (with Hall effect sensors), sensorless brushless motors reduce wiring and components. In high-power vertical power tools, where heat easily affects electrical components, sensorless brushless motors have a longer lifespan. As shown in Figure 3, the reducer 52 is a three-stage planetary structure. This three-stage planetary structure is installed in the reduction mounting part 132 of the mounting sleeve 13. The three-stage planetary structure includes a first-stage internal gear ring 521, second and third-stage internal gear rings 522, a first-stage planetary carrier 523, a first-stage planetary gear 524, a second-stage planetary carrier 525, a second-stage planetary gear 526, a third-stage planetary carrier 527, and a third-stage planetary gear 528. The first-stage internal gear ring 521 and the second and third-stage internal gear rings 522 are stacked and tightly mounted against the inner wall of the reduction mounting part 132. The first-stage planetary gear 524 has multiple... The first-stage planetary gears 524 are mounted on the first-stage planetary carrier 523 and mesh with the output gear on the output end 541 of the input wheel 54 of the reducer. The second-stage planetary gears 526 are multiple and are mounted on the second-stage planetary carrier 525 and mesh with the first-stage planetary carrier 523. The third-stage planetary gears 528 are multiple and are mounted on the third-stage planetary carrier 527 and mesh with the second-stage planetary carrier 525. The third-stage planetary carrier 527 has a hole in the middle for the lower end of the lead screw 31 to be inserted. The lower end of the lead screw 31 is inserted into the middle of the third-stage planetary carrier 527.

[0049] In this embodiment, the motor 51 is inverted and positioned beside the mounting sleeve 13, significantly shortening the overall length of the main body. This reduces the vertical length of the tool body, making the tool smaller and more adaptable to narrower working environments. With the motor 51 inverted, it is connected to the reducer 52 via a linkage (motor output wheel 53, idler wheel 55, and reducer input wheel 54). Under the action of this linkage, the torque is amplified and transmitted to the lead screw, achieving high thrust output while improving transmission efficiency, minimizing energy loss, ensuring stable (constant) output force, and enhancing reliability.

[0050] Furthermore, after the motor 51 is inverted, as shown in Figure 4, the air inlet 512 is located at the top and the air outlet 513 is located at the bottom. This allows for simultaneous heat dissipation of the motor 51, the linkage, the side reducer 52, and the controller located at the bottom, improving the heat dissipation and cooling effect. This solves the problem of tool overheating during continuous operation and greatly extends the continuous working time of the tool (in the past, the motor, lead screw, and reducer were arranged vertically with the air outlet located at the top, resulting in poor heat dissipation, especially for the controller located at the bottom of the motor, which could hardly assist in heat dissipation. Therefore, the continuous working time of the tool was limited, and it had to be stopped after working for a certain period of time to wait for it to cool down before working again).

[0051] As shown in Figure 2, the screw mounting part 131 of the mounting sleeve 13 includes a guide part 1311 and a mounting part 1312. The guide part 1311 is located at the end of the mounting part 1312 away from the deceleration mounting part 132, and its inner wall is provided with several guide grooves 1313 that cooperate with the movable sleeve. The mounting part 1312 is provided with a mounting step 1314 for mounting the screw 31 near the deceleration mounting part 132. The screw 31 is provided with a mounting plate 32 integrally or separately on the end near the reducer 52 (as shown in Figure 2 or Figure 3, the mounting plate 32 and the screw 31 are integrally set, which makes it less prone to errors and wear during installation). A planar thrust bearing 331 (also called a planar needle roller bearing) is provided between the mounting plate 32 and the mounting step 1314. A deep groove ball bearing 332 is provided on the side of the mounting step 1314 away from the planar thrust bearing 331. One end of the screw 31 passes through the deep groove ball bearing 332 (also called a ball bearing) and is combined with the reducer 52. The use of a planar thrust bearing 331 not only allows for stable installation between the lead screw 31 and the mounting part 1312 when it is matched with a deep groove ball bearing 332, but also counteracts the recoil force in the axial direction of the lead screw 31, making the lead screw 31 more stable under force and protecting the lead screw 31.

[0052] As shown in Figure 6, the sensing mechanism 60 is installed between the mounting sleeve 13 and the movable sleeve, including a sensing element 61 and a sensor 62. The movable sleeve includes a push rod 34 and a lead screw nut 35, which are either integrally set or separately combined. The sensing element 61 is installed on the lead screw nut 35, and the sensor 62 is installed on the mounting portion 1312 of the mounting sleeve 13. In this embodiment, the movable sleeve is set separately as an example: as shown in Figure 5, the lead screw nut 35 has a through hole 351 in the middle for the lead screw 31 to pass through, and the sensing element 61 is installed on the outer circumference near the bottom. The lead screw nut 35 is located at one end of the push rod 34. The push rod 34 has a structure with one end closed and the other end open. The closed end forms a connector 341, as shown in Figure 2. The connector 341 extends out of the mounting sleeve 13 and is fixed to the roller seat 21 by a screw 23, thereby realizing the connection between the push rod 34 and the roller seat 21. The push rod 34 is hollow inside, and the open end is sleeved on the outside of the end of the lead screw 31 away from the reducer 52.

[0053] As shown in Figure 6, the open end of the push rod 34 extends into the through hole 351 of the lead screw nut 35, forming an insertion end 342. This insertion end 342 is an annular boss structure. The push rod 34 is connected to the lead screw nut 35 through this annular boss structure. The lead screw nut 35 is located at the end of the push rod 34 (i.e., the lead screw nut 35 is located at the end of the push rod 34 away from the roller seat 21). During the rotation of the lead screw 31, the push rod 34 can drive the roller seat 21 to move, thereby causing the roller 22 to push the crimping pliers 40 to work. During the movement, the roller 22 will contact the inner end of the clamp arm 41. Under the pushing force of the roller 22, the clamp arm 41 will rotate around the central axis, thereby causing the crimping pliers 40 to close and crimp the workpiece. Since the structure and principle of using a roller to drive the crimping pliers is existing technology, it will not be described in detail here.

[0054] As shown in Figure 6, a mounting groove 352 is provided at one end of the through hole 351 of the lead screw nut 35 near the push rod 34. The bottom of the mounting groove 352 forms an annular working surface 353, which abuts against the lower end face of the extension end 342 of the push rod 34. The two interact, allowing the lead screw nut 35 to push the push rod 34 towards the roller seat 21 under the action of the lead screw 31. The specific installation structure of the lead screw nut 35 and the push rod 34 is as follows: a groove 357 is formed by a circumferential recess on one side of the working surface 353 on the inner wall of the through hole 351. A limiting member 37 is installed in the groove 357, which connects the lead screw nut 35 and the push rod 34, thereby placing the extension end 342 between the limiting member 37 and the working surface 353.

[0055] The push rod 34 has two directions of movement: one is the direction that pushes the roller seat 21 toward the crimping clamp 40, called the pushing direction; the other is the opposite direction, called the retraction direction. As shown in Figure 5, the push rod 34 moves in the pushing direction by the action surface 353 of the screw nut 35 acting on the lower end face of the extension end 342 of the push rod 34, which has the characteristic of high load-bearing capacity and is easy to bear the large pushing force during operation; the push rod 34 moves in the retraction direction by the end structure of the screw nut 35 and the limiting clip 37 acting on the extension end 342 to pull back, at which time the force is relatively small and it is not easy to affect the life of the limiting clip 37.

[0056] As shown in Figures 6 and 7, the inner wall of the through hole 351 is provided with a spiral groove 354 that mates with the threaded section 311 on the surface of the lead screw 31. A ball bearing 39 is positioned between the spiral groove 354 and the threaded section 311. An installation hole 355 is provided on the lead screw nut 35 for mounting a reversing device 356, forming an internal circulation ball screw structure with the lead screw 31. The outer periphery of the lead screw nut 35 is also provided with a slide bar 358 (which can also be a spline tooth structure). A guide groove 1313 (which can also be a spline groove structure that mates with spline teeth) on the inner wall of the guide portion 1311 can mate with the slide bar 358, allowing the lead screw nut 35 to move smoothly axially along the inner wall of the guide portion 1311 of the mounting sleeve 13, providing good guidance and stability.

[0057] A sensing element 61 is mounted on the circumferential surface of the lead screw nut 35 near the sensor 52. The sensing element 61 is preferably a sensing magnet, and the sensor 62 is preferably a Hall sensor. The sensor 62 is mounted on the mounting part 1312 of the mounting sleeve 13 to identify the position of the sensing magnet and is electrically connected to the controller via a wire 63. The sensor 62 transmits signals to the controller.

[0058] As shown in Figure 9, the mounting sleeve 13 is installed inside the housing 11. A mounting recess 1315 is formed on the outer circumferential surface of the mounting portion 1312, and the sensor 62 is fixed within this recess 1315 by screws 621. In this embodiment, the mounting recess 1315 is shaped like a racetrack, and the sensor 62 is embedded. To facilitate sensing between the sensor 62 and the sensing element 61 and improve sensing accuracy, the sensing element 61 is mounted on the circumferential surface of the lead screw nut 35 near the bottom, corresponding to the location of the sensor 62. Mounting the sensor 62 on the mounting sleeve 13 allows it to be closer to the controller. Furthermore, since the mounting sleeve 13 is built into the housing 11 and remains relatively fixed relative to it, adjusting the working angle of the pressure connector during use will not affect the sensor 62, thus ensuring its normal operation. The mounting sleeve 13 has a positioning groove 134 formed by an inward recess on its outer circumference at the connection between the lead screw mounting portion 131 and the deceleration mounting portion 132, used for positioning and mounting within the housing.

[0059] The top end face of the mounting sleeve 13 is provided with an indication recess 133 corresponding to the sensor 62. The indication recess 133 is aligned with the sensor 62 in the axial direction. The indication recess 1316 is provided to indicate the installation position of the sensing element 61 during assembly. The sensing element 61 is aligned with the indication recess 133 before being installed into the mounting sleeve 13, so that the sensing element 61 is directly facing the sensor 62 after installation, ensuring the accuracy of sensing.

[0060] The mounting sleeve 13 is located on the outside of the lead screw 31, push rod 34, and lead screw nut 35. Its end is connected to the pliers head seat 12. The end of the mounting sleeve 13 near the roller seat 21 is threadedly connected to the mounting section 121 of the pliers head seat 12. The interior of the mounting sleeve 13 is hollow, which encloses the lead screw 31 and lead screw nut 35 inside the mounting sleeve 13. A gap is formed between the inner wall of the mounting sleeve 13 and the outer wall of the lead screw 31 for the push rod 34 and lead screw nut 35 to move, so that the push rod 34, lead screw nut 35 and mounting sleeve 13 form a relatively sealed space. The lead screw 31 is located in this sealed space, which further seals and protects the lead screw 31, preventing dust and impurities from entering and affecting the accuracy of the lead screw.

[0061] As shown in Figure 2, a bearing 38 is also fitted at one end of the lead screw 31 inside the push rod 34. The bearing 38 is fixed to the lead screw 31 by a snap ring. The bearing 38 is located between the top of the lead screw 31 and the inner wall of the push rod 34. This not only makes the rotation of the lead screw 31 more stable, but also limits the stroke of the lead screw nut 35, preventing the lead screw nut 35 from detaching from the lead screw 31, thus making the structure more stable.

[0062] As shown in Figure 10, one end of the plier head seat 12 (mounting section 121) extends into the housing 11 and is threadedly connected to the top of the mounting sleeve 13. The other end extends out of the housing 11 for mounting the crimping pliers 21. A limiting member 122 (which can be a screw) is provided on the peripheral side of the plier head seat 12. The limiting member 122 has a limiting head protruding from the outer peripheral surface of the plier head seat 12. A protruding limiting protrusion 113 is provided on the inner wall of the housing 11. The limiting head on the limiting member 122 can abut against the limiting protrusion 113 during the rotation of the plier head seat 12, thereby limiting the rotation angle of the plier head seat 12. The limiting protrusion 113 and the limiting member 122 are almost at the same height. The number of limiting protrusions 113 corresponds to the rotation angle of the pliers head seat 12. For example, when there is one limiting protrusion 113, the pliers head seat 12 can rotate at an angle close to 360° (in reality, because the limiting protrusion 113 itself has a certain width, the rotation angle is actually less than 360°); or as shown in Figure 10, two limiting protrusions 113 are arranged, and the pliers head seat 12 can rotate at an angle of approximately 180°. Therefore, the number of limiting protrusions 113 can be set according to the actual rotation angle required by the pliers head seat 12.

[0063] The main working principle of this power tool is to control the motor to rotate through the control module, so that the lead screw rotates under the drive of the motor and reducer. During the rotation of the lead screw, the lead screw nut 35 and push rod 34 installed on it will move axially. The roller seat 21 on the outer end of the push rod 34 will bring the roller 22 closer to the crimping pliers. When it contacts the crimping pliers, the crimping pliers will start to rotate and close under the action of the roller 22. During the closing process, the pipe fitting is pressed until the crimping pliers are completely closed.

[0064] In this embodiment, the working mechanism (i.e., roller base 21 and roller 22) has a first initial position, a second initial position, a work completion position, and a full stroke position. Correspondingly, the control module is set with at least two modes: a first mode that allows the working mechanism to move from the first initial position to the work completion position or the full stroke position corresponding to the initial position, and a second mode that allows the working mechanism to move from the second initial position to the work completion position or the full stroke position corresponding to the second initial position. Specifically, the first initial position is the starting position of the working mechanism when the tool is in the first mode. After the first mode is officially started, the working mechanism will move from the first initial position. When the working part completes the pressing (or shearing, etc.) of the pipe, the working mechanism will reach the first work completion position. Furthermore, if the working mechanism is not currently in the first initial position after the user selects to activate the first mode, the working mechanism will first move from the current position to the first initial position before officially starting the work. Similarly, the second initial position is the starting position for the working mechanism to officially begin working when the tool is in the second mode. After officially starting work in the second mode, the working mechanism will move from the first initial position. When the working part completes the pressing (or shearing, etc.) of the pipe, the working mechanism will reach the second work completion position. Furthermore, if the working mechanism is not currently in the second initial position after the user selects to activate the second mode, it will first move from its current position to the second initial position before starting formal work. The first work completion position and the second work completion position can be the same or different positions, mainly determined by the performance of the currently used working part.

[0065] The full stroke position is the position where the working mechanism can reach the maximum stroke when no working part is installed (that is, when the crimping pliers 40 are not installed on the pliers head seat 12, starting the motor can allow the roller seat 21 to move forward without obstruction with the roller 22, and at this time a full stroke can be completed to reach the full stroke position). Under normal circumstances, the stroke moved from the first initial position or the second initial position to its corresponding work completion position is less than this maximum stroke.

[0066] In the above process, the current position of the working mechanism can be determined by the sensing between the sensing element 61 and the sensor 62. Since there are two initial positions, in this embodiment, as shown in Figure 7, the sensor 62 is also provided with two sensing points, namely a first sensing point 622 corresponding to the first initial position and a second sensing point 623 corresponding to the second initial position. Since the working mechanism is pushed by the movable sleeve (lead screw nut 35 and push rod 34), the first initial position, the second initial position, the work completion position, and the full stroke position of the working mechanism all have corresponding positions during the movement of the movable sleeve. The sensing element 61 is installed on the lead screw nut 35. Therefore, the sensing element 61 also has corresponding first sensing initial position, second sensing initial position, sensing work completion position, and sensing full stroke position during the movement of the lead screw nut 35. The position of the sensing element 61 is identified by the first sensing point 622 and the second sensing point 623 on the sensor 62, and relevant signals are sent to the control module, thereby further controlling the tool operation based on the position of the sensing element 61.

[0067] During the tool's operation, the movement of the working mechanism, movable sleeve, and sensing components includes the following stages:

[0068] Phase 1: During formal operation (i.e., when the working mechanism is in the first initial position or the second initial position), the control module first controls the motor 51 to rotate forward, which drives the lead screw 31 to rotate, so that the lead screw nut 35 carries the sensing element 61 to start moving from the corresponding first sensing initial position (or second sensing initial position). At the same time, the lead screw nut 35 carries the push rod 34 forward, and the roller seat 21 on the push rod 34 carries the roller 22 (i.e., the working mechanism) to move closer to the crimping clamp from the first initial position or the second initial position.

[0069] Phase 2: When roller 22 contacts the crimping pliers, the crimping pliers begin to rotate and close under the action of roller 22. During the closing process, the pipe fitting is pressed until the crimping pliers are fully closed. At this time, the working mechanism moves to the work completion position corresponding to the initial position, and the motor pauses for a period of time.

[0070] Phase 3: The control module controls the motor 51 to reverse, causing the lead screw 31 to reverse, so that the lead screw nut 35, along with the sensing element 61 and the working mechanism, retracts from the completed work position to the first initial position (or the second initial position), thus completing one work cycle.

[0071] Before stage one, if the sensing element 61 (or working mechanism or movable sleeve) is not in the first or second initial position, the control module will first control the motor 51 to rotate, causing the lead screw nut 35 to bring the sensing element 61 back to the first or second initial position. Then, the motor 51 will rotate forward to control the roller to extend, causing the crimping clamp to gradually close and crimp the workpiece. In stage one, the motor speed is high, and the travel distance in this stage is approximately one-third of the total travel distance. After reaching this point, the motor speed decreases under the control of the control module. In stage two, due to the resistance generated when pressing the pipe, the motor speed will gradually decrease until the speed drops to 0 after the pipe is pressed, and it will pause for a period of time (brief pause). Then, the control module will control the motor 51 to reverse, at which point the motor speed will also be high to speed up the reset.

[0072] In this embodiment, the working components include at least two working components of different sizes. One of these two working components is selectively mounted on the exposed portion of the pliers head seat that protrudes from the housing for use. Specifically, the distance from the first initial position to the full-stroke position is less than the distance from the second initial position to the full-stroke position; that is, the first initial position is adapted to the smaller working component, and the second initial position is adapted to the larger working component. When the smaller working component is mounted on the pliers head seat 12, and mode one is selected, if the working mechanism is currently in the first initial position, it will directly begin moving from that position to begin working after the master control switch is turned on. If the working mechanism is not in the first initial position, after the master control switch is turned on, the working mechanism will first move from its current position to the first initial position, and then begin moving from the first initial position to begin working. After completing the work, the working mechanism will directly return to the first initial position. Similarly, when working on large-sized components, if mode two is selected and the working mechanism is currently in the second initial position, it will begin moving directly from that position to begin work after the main control switch is turned on. If the working mechanism is not in the second initial position (for example, if mode one was selected during the previous operation and the working mechanism is currently in the first initial position), it will first move from its current position to the second initial position after the main control switch is turned on, and then begin moving from the second initial position to begin work. After completing the work, the working mechanism will return directly to the second initial position. Therefore, for small-sized components, the working stroke is shorter than that for large-sized components, resulting in improved efficiency. In practice, the distance from the first initial position to the full stroke position can also be set to be greater than the distance from the second initial position to the full stroke position. In this case, the first initial position is suitable for large-sized components, and the second initial position is suitable for small-sized components.

[0073] <Example 2>

[0074] Based on Embodiment 1 above, as shown in Figures 11-14, the pliers head base 12 is cylindrical in shape, with a slot 123 on the side for inserting the working part. A protective sleeve 14 is slidably disposed on the outer periphery of the pliers head base 12. The protective sleeve 14 can move axially along the pliers head base 12. When using a small working part, since the length of the small working part (pliers arm) is short, the length of the working part cannot cover the entire length of the slot 123. Therefore, the protective sleeve 14 can be slid to cover and block the excess part of the slot 123, preventing the user from accidentally inserting their hand during the operation and causing injury.

[0075] A limiting assembly is provided between the pliers head seat 12 and the protective sleeve 14. This limiting assembly includes an axial limiting assembly and a radial limiting assembly. As shown in Figures 12 and 14, the axial limiting assembly has a limiting steel ball 151 and a return spring 152 disposed on the pliers head seat 12. The protective sleeve 14 has at least two limiting holes 141 disposed along the sliding direction and cooperating with the limiting steel ball 151. Under the action of the return spring 152, the outer side of the limiting steel ball 151 can abut against the limiting hole 141, thereby limiting the protective sleeve 14 in the axial direction. As shown in Figures 13 and 14, the radial limiting assembly has a limiting groove 142 opened along the axial direction on the inner wall of the protective sleeve 14 and a limiting steel ball 153 embedded in the pliers head seat 12. When the protective sleeve 14 slides, the limiting groove 142 slides along with it, and under the action of the limiting steel ball 153, the protective sleeve 14 can be prevented from rotating radially, thereby limiting the protective sleeve 14 in the radial direction.

[0076] Furthermore, a pair of handles 16 are provided on the outer side of the protective cover 14 corresponding to the straight opening groove 123, which makes it easy for the user to hold the protective cover 14 and slide it. At the same time, a groove 161 is provided on the side of the handle 16 facing the working part, which can avoid the end of the working part.

[0077] <Example 3>

[0078] Based on embodiments 1-2 above, as shown in Figure 9, the mounting recess 1315 for mounting the sensor 62 in the middle of the mounting sleeve 13 has a semi-circular shape at one end and a straight shape at the other end. The different shapes at both ends can prevent incorrect installation during installation.

[0079] <Example 4>

[0080] This embodiment is basically the same as embodiments 1-3 above, except that in embodiments 1-3, the lead screw 31 and its mounting plate 32 are integrally formed, while in this embodiment, as shown in Figure 15, the mounting plate 32 is separately fitted on the outer periphery of the lead screw 31 above the mounting step 1314 of the mounting sleeve 13. The mounting plate 32 has a "convex" shaped cross-section, with a large end 32a and a small end 32b with a smaller outer diameter. A planar thrust bearing 331 is provided between the outer periphery of the small end 32b and the inner wall of the mounting sleeve 13. The separate structure facilitates disassembly and replacement, and results in less waste and lower cost during processing.

[0081] <Example 5>

[0082] This embodiment is basically the same as embodiments 1-4 above, except for the limiting structure during the rotation of the pliers head seat 12, as shown in Figure 16. One end of the pliers head seat 12 (mounting section 121) extends into the outer shell 11 and is threadedly connected to the top of the mounting sleeve 13. The other end extends out of the outer shell 11 for mounting the crimping pliers 21. The top of the outer shell 11 is provided with a central hole 111 for the pliers head seat 12 to extend out. The edge of the central hole 111 extends inward to form a limiting flange 112. The peripheral side of the pliers head seat 12 is provided with a limiting member 122 (which can be a screw). The projections of the limiting flange 112 and the limiting member 122 in the axial direction overlap. Since the pliers head seat 12 and the mounting sleeve 13 are threadedly connected, the pliers head seat 12 will move axially relative to the mounting sleeve 13 when the pliers head seat 12 is rotated. The cooperation between the limiting flange 112 and the limiting member 122 can prevent the pliers head seat 12 from disengaging due to rotation. The limiting member 122 is installed close to the limiting protrusion 112. The closer the distance between the limiting member 122 and the limiting protrusion 112, the smaller the angle (or the fewer turns) that the clamp head seat 12 can rotate.

[0083] <Example 6>

[0084] This embodiment is basically the same as the embodiments 1-5 above, except that the motor 51 and the reducer 52 are coaxially installed, that is, the mounting sleeve 13, the reducer 52 and the motor 51 are all located on the same axis and arranged in a straight line.

[0085] <Example 7>

[0086] Based on embodiments 1-6 above, this embodiment proposes a new working component mounting structure, as shown in Figure 17. The working component (crimping pliers 40) is detachably mounted on the pliers head base 12 via a mounting assembly. This mounting assembly includes a pin 71, a limiting block 72, a limiting button 73, a spring 74, and a reset component, as shown in Figure 18. The pliers head base 12 and a pair of connecting plates 43 are each provided with a pair of through holes. A limiting block 72 is fixed to one side of the pliers head base 12, and a pair of limiting buttons 73 are movably mounted on the limiting block 72. One end of the pin 71 passes through the through holes on the pliers head base 12 and the pair of connecting plates 43 and engages with the limiting button 73. The other end is exposed on the pliers head base 12 via the spring 74. A limiting groove 711 is formed at the end of the pin 71 near the limiting block 72. The inner end of the limiting button 73 is provided with a limiting hook 731 that can be hooked into the limiting groove 711. A reset component (not shown in the figure) is provided between the limiting button 73 and the limiting block 72. During installation, first press a pair of limit buttons 73 to bring the limit hooks 731 at their ends closer together. Then, insert the pin 71 so that the limit hooks 731 are embedded in the limit grooves 711. Release the limit buttons 73; under the action of the reset component, the limit buttons 73 reset, and the two limit hooks 731 separate and hook into their respective limit grooves 711, completing the installation of the working component. Disassembly is also quick and easy; simply press the limit buttons 73 to bring the two limit hooks 731 closer together, then remove the pin 71.

[0087] Functions and effects of the examples:

[0088] According to the multi-stage power tool drive device and multi-stage power tool of the above embodiments, since the working mechanism has at least two initial positions (first initial position and second initial position) and the control module is correspondingly set with at least two modes (first mode and second mode), the working mechanism can select the first initial position or the second initial position to work for different sized working parts. On the one hand, it is applicable to a variety of different sized working parts, and on the other hand, it can save the working time of small-sized working parts and improve work efficiency.

[0089] Furthermore, in this embodiment, the motor 51 is inverted and positioned beside the mounting sleeve 13, significantly shortening the overall length of the main body. This reduces the vertical length of the tool body, making the tool smaller and more adaptable to narrower working environments. With the motor 51 inverted, it is connected to the reducer 52 via a linkage (motor output wheel 53, idler wheel 55, and reducer input wheel 54). Under the action of this linkage, the torque is amplified and transmitted to the lead screw, achieving high thrust output while improving transmission efficiency, minimizing energy loss, ensuring stable (constant) output force, and increasing reliability. Additionally, with the motor 51 inverted, the air inlet 512 is located at the top, and the air outlet 513 at the bottom, simultaneously dissipating heat from the motor 51, the linkage, the side reducer 52, and the controller at the bottom. This improves heat dissipation and cooling, solving the problem of tool overheating during continuous operation and significantly extending the tool's continuous working time.

[0090] Furthermore, since the sensor 62 is mounted on the mounting sleeve 13 and the corresponding sensing element 61 is mounted on the lead screw nut 34, when the tool needs to be used to adjust the installation direction of the working part by rotating the pliers head seat 12 (the structure used to install the working part), no matter how the pliers head seat 12 rotates, it will not affect the sensor 62 mounted on the mounting sleeve 13 (that is, the wire connecting the sensor 62 to the controller will not be tangled or broken due to rotation), thus protecting the sensor 62 and ensuring that the sensor 62 can be used normally.

[0091] Furthermore, the sensor has a corresponding number of sensing points for each initial position. Each sensing point corresponds to each initial position. When switching to a certain mode, the sensor obtains the current position of the sensor by sensing the sensor point, and determines whether the position is the initial position corresponding to the current mode. If it is not the corresponding initial position, the motor is controlled to start and drive the sensor back to the initial position before normal operation begins.

[0092] Furthermore, the integrated design of the mounting sleeve 13 for mounting the lead screw 31 and the reducer 52 eliminates the need for a separate reducer 52 housing, simplifying the structure, reducing costs, and making the entire lead screw 31 rotation structure more stable.

[0093] Furthermore, since the lead screw 31 is located inside the housing 11, and the push rod 34 and the lead screw nut 35 are sleeved on the outer periphery of the lead screw 31, a relatively sealed space is formed inside the guide sleeve on the circumferential surface, which can prevent dust from entering and affecting the lead screw 31, thus protecting the lead screw 31.

[0094] Furthermore, since the hardness required for the push rod 34 in actual operation is less than that of the lead screw nut 35, the push rod 34 and the lead screw nut 35 are set separately in the above embodiment, and different hardness materials are selected for the two, which can reduce costs and requirements to a certain extent.

[0095] Furthermore, since the control motor uses a sensorless brushless motor 51, compared to using a traditional sensored motor (with Hall element), the wiring layout and components are reduced. In high-power vertical power tools, where heat can easily affect electrical components, the sensorless brushless motor has a longer lifespan.

[0096] The above embodiments are merely illustrative of specific implementations of the present invention, and the present invention is not limited to the scope of the above embodiments. For example, in the cases provided in the above embodiments, the push rod and the lead screw nut are separately configured; in actual situations, the push rod and the lead screw nut can also be integrated. In the cases provided in the above embodiments, the working component is a crimping pliers; in actual situations, it can also be replaced with a shearing head, a caliper combined with a ring die, or other working components, i.e., the working components can be replaced according to different working environments and requirements. In the above embodiments, two initial positions and two sensing points are provided; in actual situations, more initial positions and corresponding sensing points can also be provided according to actual needs. The above embodiments are listed as applications in vertical power tools where the working mechanism, motor assembly, control module, and power supply are arranged vertically; in actual situations, they can also be applied to pistol-type power tools.

Claims

1. A multi-stage electric power tool driving device provided in a multi-stage electric power tool, characterized by, The utility model relates to a kind of work mechanism, including: Mounting sleeve; Jaw seat, provided on the mounting sleeve; Working mechanism, movably provided on the jaw seat, and at least having first initial position, second initial position and full stroke position; And Control module, at least having first mode and second mode corresponding to the first initial position and the second initial position respectively; The distance from the first initial position to the full stroke position is less than or greater than the distance from the second initial position to the full stroke position.

2. The multi-stage power tool drive device according to claim 1, characterized by, Further comprising: Pushing mechanism, mounted on the mounting sleeve, for pushing the working mechanism to move; Sensing mechanism, with sensor and sensing piece; Wherein, the pushing mechanism has: Lead screw, rotationally arranged in the mounting sleeve; Movable sleeve, movably sleeved on the outer side of the lead screw, and connected with the working mechanism;And Motor assembly, for driving the lead screw to rotate, the lead screw drives the movable sleeve to move axially during rotation; The sensing piece is installed on the end of the movable sleeve away from the working mechanism, and the sensor is installed on the mounting sleeve.

3. The multi-stage power tool drive device according to claim 2, characterized by, The sensor has at least first sensing point and second sensing point.

4. The multi-stage power tool drive device according to claim 2, characterized by, The motor assembly has: Motor, connected with the control module, Speed reducer, combined with the lead screw; The motor and the speed reducer are coaxially arranged or the motor is inverted beside the speed reducer, Wherein, when the motor is inverted beside the speed reducer, The motor assembly further has linkage installed between the motor and the speed reducer and driving seat for covering the linkage, the driving seat has: Connecting flange, containing first mounting part for mounting the motor and second mounting part for mounting the speed reducer; End cover, covering the bottom of the connecting flange; The end cover and the connecting flange form a containing cavity containing the linkage, and the linkage has: Motor output wheel, installed on the motor shaft of the motor; Speed reducer input wheel, connected with the speed reducer, and Idler, connecting the motor output wheel and the speed reducer input wheel.

5. The multi-stage power tool drive device according to claim 4, characterized by, The idler has a needle bearing embedded in the middle, and the needle bearing has a mounting shaft inserted into the connecting flange at one end and into the end cover at the other end, and the idler has a gasket between the two end faces and the connecting flange and the end cover.

6. The multi-stage power tool drive device according to claim 2, characterized by, The working mechanism has a roller seat and a pair of rollers installed on the roller seat, The movable sleeve has: Push rod, one end of which extends into the mounting sleeve and is sleeved on the outer periphery of the lead screw, and the other end extends out of the mounting sleeve and is fixed with the roller seat, Lead screw nut, movably sleeved on the outer periphery of the lead screw, and integrally or separately arranged with the end of the push rod away from the roller seat, Wherein, the sensing piece is installed on the outer periphery of the lead screw nut.

7. The multi-stage power tool drive device according to any one of claims 1 to 6, characterized in that, The jaw seat has a protective sleeve slidingly arranged on the outer periphery, and the jaw seat has a limit steel ball and a return spring, and the protective sleeve has at least two limit holes arranged in the sliding direction and matched with the limit steel ball.

8. A multi-stage power tool characterized by comprising: Including: Working component, A housing, in which a multi-stage electric tool driving device as claimed in any one of claims 1-7 is installed, The working part is detachably installed on the exposed part of the jaw seat extending out of the housing.

9. The multi-stage power tool of claim 8, wherein, The working part comprises at least two working parts of different sizes, which are alternatively installed on the exposed part.

10. The multi-stage power tool according to claim 8 or 9, characterized by The mounting sleeve is installed in the housing, one end of the jaw seat is rotatably connected with the mounting sleeve in the housing, and the other end extends out of the housing, and the side surface of the jaw seat is provided with a limiting member, The top of the housing is provided with a central hole for the jaw seat to extend out, the edge of the central hole extends inward to form a limiting convex edge, and the limiting convex edge and the projection of the limiting member in the axial direction have an overlapping part. Alternatively, a protruding limiting convex part is arranged on the inner wall of the housing, and the limiting member can abut against the limiting convex part during the rotation of the jaw seat.

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