Mounting device of electric tool, multi-section electric tool and main body of multi-section electric tool

Abstract

The utility model belongs to the technical field of electric tools, and particularly relates to a mounting device of an electric tool, a multi-section type electric tool and a main body of the multi-section type electric tool. The mounting device is arranged in the electric tool, is used for mounting a working part of the electric tool, and comprises a tong head seat which is provided with an open slot for mounting the working part; the protective sleeve is arranged on the periphery of the tong head seat in a sliding manner and is used for shielding the outer side of part of the open slot; and the limiting mechanism is arranged between the tong head seat and the protective sleeve. Due to the fact that the protective sleeve is arranged on the outer side of the plier head seat in the sliding mode, when working is carried out, if a small-size working part is installed, the protective sleeve can be moved to cover the outer side of the exposed portion of the open groove, a user can be prevented from being injured due to the fact that the fingers and other portions are mistakenly embedded in the protective sleeve, a good protective effect is achieved, and the safety of a tool is improved.

Description

Technical Field

[0001] This utility model belongs to the field of power tool technology, specifically relating to a power tool mounting device and a multi-section power tool body. 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 working head (such as a crimping head) detachably mounted in an opening slot of a mounting base, and the crimping head is driven by a roller assembly built into the mounting base. While this type of tool provides good crimping results, it still has some problems in use. For example, when the size of the working head used is small (such as a short crimping head arm), the gap at the bottom of the opening slot (the end closest to the outer casing) is exposed. If the user accidentally puts their fingers in this gap, they are easily injured by the movement of the roller assembly when the tool is started, causing a serious work accident, which is not safe enough. Summary of the Invention

[0004] To address the aforementioned problems, this utility model provides an installation device for an electric tool with a protective sleeve on the pliers head, a multi-stage electric tool, and its main body.

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

[0006] This utility model proposes an installation device for power tools, which is installed in the power tool for installing the working part of the power tool. It has the following features: a plier head base with an opening groove for installing the working part; a protective sleeve slidably disposed on the outer periphery of the plier head base for covering part of the outer side of the opening groove; and a limiting mechanism disposed between the plier head base and the protective sleeve.

[0007] The power tool mounting device proposed in this utility model also has the following feature: the limiting mechanism includes an axial limiting component, which has a limiting steel ball and a return spring disposed on the pliers head seat, and the protective sleeve is provided with at least two limiting holes disposed along the sliding direction and cooperating with the limiting steel ball.

[0008] The power tool mounting device proposed in this utility model also has the following feature: the limiting mechanism further includes a radial limiting component, which has a limiting groove opened axially on the inner wall of the protective sleeve and a limiting steel ball embedded in the pliers head seat, and the limiting steel ball can roll relative to the limiting groove.

[0009] The power tool mounting device proposed in this utility model also has the following feature: a pair of handles are provided on the outer side of the protective sleeve corresponding to the opening groove, and the handles are provided with grooves on the side facing the working part.

[0010] This utility model also proposes a multi-section power tool body, characterized in that it includes: a housing; a drive unit mounted on the housing; and a mounting device mounted on the drive unit; wherein the mounting device is the mounting device of the power tool as described above, with one end of the pliers head extending into the housing and the other end extending out of the housing to form an exposed portion for mounting the working parts, and the drive unit is used to drive the working parts to work.

[0011] The multi-stage power tool body proposed in this utility model also has the following features: the driving device includes: a mounting sleeve, which is built into the housing and one end is rotatably connected to the pliers head seat; a working mechanism, which is movably mounted on the pliers head seat for driving the working parts to work, and has at least a first initial position, a second initial position and a full stroke position; and a control module, which has at least a first mode that enables the working mechanism to move from the first initial position to the full stroke position and a second mode that enables the working mechanism to move from the second initial position to the full stroke position.

[0012] The multi-segment power tool body proposed in this utility model also has the following features: the driving device further includes: a pushing mechanism, installed on the 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, and during the rotation of the lead screw, driving the movable sleeve to move axially; the sensing element is installed on the end of the movable sleeve away from the working mechanism, the sensor is installed on the mounting sleeve, and the sensor has at least a first sensing point and a second sensing point.

[0013] The multi-section power tool body proposed in this utility model also has the following features: the motor assembly includes: a motor connected to the control module, and a reducer combined with a lead screw; the motor and reducer are coaxially arranged or the motor is inverted and placed next to the reducer.

[0014] The multi-section power tool body proposed in this utility model also has the following feature: when the motor is inverted next to the reducer, the motor assembly also has a linkage component installed between the motor and the reducer, and a drive seat for covering the linkage component. The drive seat has: a connecting flange containing a first mounting part for mounting the motor and a second mounting part for mounting the reducer; an end cover covering the bottom of the connecting flange; and a receiving cavity for accommodating the linkage component formed between the end cover and the connecting flange. The linkage component has: 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.

[0015] The multi-section power tool body proposed in this utility model 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.

[0016] This utility model also proposes a multi-stage power tool, which includes at least two working parts and a main body, as described above, wherein at least one of the at least two working parts is selectively installed on the main body for use.

[0017] Functions and effects of utility models

[0018] According to the present invention, the installation device for the power tool, the multi-section power tool and its main body, since a protective sleeve is slidably provided on the outside of the pliers head seat, when a small working part is installed, the protective sleeve can be moved so that the protective sleeve covers the outside of the exposed part of the opening slot, which can prevent the user from being injured by accidentally embedding fingers or other parts, thus playing a better protective role and improving the safety of the tool.

[0019] Furthermore, since the working mechanism has at least two initial positions (first initial position and second initial position) and the control module is 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 on different sized working parts (such as calipers with different arm lengths). 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 This is a schematic diagram of the structure of the multi-section power tool body of this utility model without the outer shell.

[0021] Figure 2 This is a simplified diagram of the installation structure of the pliers head base and protective sleeve in Embodiment 1 of this utility model.

[0022] Figure 3 This is one of the axial cross-sectional views of the installation structure of the clamp head seat and protective sleeve in Embodiment 1 of this utility model.

[0023] Figure 4 This is the second axial cross-sectional view of the mounting structure of the clamp head seat and protective sleeve in Embodiment 1 of this utility model.

[0024] Figure 5 This is a radial cross-sectional view of the mounting structure of the clamp head seat and protective sleeve in Embodiment 1 of this utility model.

[0025] Figure 6 This is a cross-sectional view of the installation device for the power tool according to Embodiment 1 of this utility model.

[0026] Figure 7 This is a cross-sectional view of the motor and reducer installation structure of Embodiment 1 of this utility model.

[0027] Figure 8 This is an exploded view of the motor and reducer installation structure of this utility model.

[0028] Figure 9 This is a simplified structural diagram of the lead screw in Embodiment 1 of this utility model.

[0029] Figure 10 This is a cross-sectional view of the movable sleeve installation structure of Embodiment 1 of this utility model.

[0030] Figure 11 This is a simplified structural diagram of the sensor in Embodiment 1 of this utility model.

[0031] Figure 12 A simplified structural diagram of the lead screw nut of this utility model.

[0032] Figure 13 This is a simplified structural diagram of the mounting sleeve of this utility model.

[0033] Figure 14 This is a cross-sectional view of the installation structure of the clamp head base and the outer shell in Embodiment 1 of this utility model.

[0034] Figure 15 This is a cross-sectional view of the lead screw installation structure in Embodiment 3 of this utility model.

[0035] Figure 16 This is a cross-sectional view of the installation structure of the clamp head base and the outer shell in Embodiment 4 of this utility model.

[0036] Figure 17 This is a schematic diagram of the installation structure of the working components in Embodiment 6 of this utility model.

[0037] Figure 18 This is a cross-sectional view of the installation structure of the working component in Embodiment 6 of this utility model.

[0038] Reference numerals: Drive unit 10, housing 11, center hole 111, limiting flange 112, clamp head seat 12, mounting section 121, limiting element 122, opening groove 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 ball 1 51. Return spring 152. Limiting steel ball 153. 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 35 5. Reversing device 356, Slot 357, Slide bar 358, Limiting clip 37, Bearing 38, Ball bearing 39, Crimping pliers 40, Clamp 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 this utility model easy to understand, the following describes in detail the installation device of the power tool, the multi-stage power tool and its main body, in conjunction with the embodiments and accompanying drawings.

[0040] <Example 1>

[0041] This embodiment proposes a multi-stage power tool, which includes a main body and at least two working parts (especially working parts of different sizes), one of which is selectively mounted on the main body during use. The main body is a multi-stage power tool body, including a drive unit 10, a housing 11, and a mounting device, such as... Figure 1As shown, the working part is a crimping pliers 40 (which can also be a shearing pliers, clamps, etc.). The crimping pliers 40 can be detachably installed at the front end of the installation device and can perform crimping work on pipes and other workpieces under the drive of the drive device 10 (when the working part is a shearing pliers, it can cut the workpiece, and so on).

[0042] The installation device includes a pliers head seat 12, a protective sleeve 14, and a limiting mechanism disposed between the pliers head seat 12 and the protective sleeve 14, such as Figures 1-5 As shown, the pliers head base 12 is cylindrical in shape, with one end extending into the housing and the other end extending out of the housing to form an exposed portion for installing the working part. The side of the pliers head base 12 has a slot 123 for the working part to be inserted and installed. 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 (clamp 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 shield the outside of the slot 123 of the extra part (i.e. the part exposed outside the working part) by the protective sleeve 14, so as to prevent the user's hand from accidentally entering and causing injury during the operation.

[0043] A limiting assembly is provided between the clamp head seat 12 and the protective sleeve 14. This limiting assembly includes an axial limiting assembly and a radial limiting assembly. Figure 3 and Figure 5 As shown, 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 is provided with at least two limiting holes 141 arranged along the sliding direction and cooperating with the limiting steel ball 151 (the limiting hole 141 can be a through hole as shown in the figure, or a blind hole with one end open and the other closed). The pliers head seat 12 has a mounting hole in the radial direction. The return spring 152 and the limiting steel ball 151 are installed in the mounting hole in sequence. 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 achieving axial limiting of the protective sleeve 14. Figure 4 and Figure 5 As shown, the radial limiting assembly has a limiting groove 142 formed axially on the inner wall of the protective sleeve 14 and a limiting steel ball 153 embedded in the plier head seat 12. The limiting steel ball 153 can roll relative to the limiting groove 142. That is, when the protective sleeve 14 slides, the limiting groove 142 slides along with it. Under the action of the limiting steel ball 153, the protective sleeve 14 can be prevented from rotating radially, thereby achieving radial limiting of the protective sleeve 14.

[0044] 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.

[0045] The drive device 10 includes at least a mounting sleeve 13, a working mechanism 20 acting on the crimping pliers 40, a pushing mechanism 30 for driving 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 a button. In this embodiment, the outer shell 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 install the mounting sleeve 13, the motor assembly 50, and the control module. The pliers head seat 12 is installed at the front end (which can be the top) of the outer shell 11, and the control module is installed at the rear end (which can be the bottom). The power supply is detachably mounted on the outer shell 11 and is located at the bottom of the control module. The button is located on the outer shell 11, and a control switch (such as a microswitch) is installed inside the outer shell 11. The control switch and the control module are electrically connected via wires. Pressing the button activates the internal control switch (the connection between the control switch, button, and control module is prior art and will not be described in detail here).

[0046] The drive unit 10, with the vertical direction as a reference, comprises, from top to bottom: a working mechanism 20, a pushing mechanism 30, a motor assembly 50, a control module, and a power supply. The working mechanism 20 has a pair of rollers 22 acting on the crimping pliers 40 and a roller seat 21 for mounting the rollers 22. The roller seat 21 and the pair of rollers 22 are mounted within the pliers head seat 12, and the roller seat 21 can move along the axis of the pliers head seat 12 with the pair of rollers 22 under the action of the pushing mechanism 30. Figure 1As shown, 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.

[0047] 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... Figure 6 As shown, 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 installed 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.

[0048] 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. One end of the reducer 52 is connected to the lead screw 31, and the other end is 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... Figure 6 As shown, 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). Figure 7 and Figure 8As shown, 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 includes 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.

[0049] 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.

[0050] In this embodiment, as Figure 6 and Figure 12As shown, the mounting sleeve 13 is an integral sleeve structure, featuring a lead screw mounting part 131 and a reduction gear mounting part 132. The lead screw mounting part 131 is used to mount the lead screw 31, while the reduction gear mounting part 132, integrally formed with the lead screw mounting part 131, is used to mount the reducer 52. In other words, the gearbox housing for mounting the reducer 52 and the mounting housing for mounting the lead screw 31 are integrated into a single structure, greatly simplifying the installation structure, reducing costs, and making the structure more compact and stable, which is beneficial for product miniaturization and weight reduction. Furthermore, 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 within it, while the drive seat 56 encloses the linkage components. This relatively enclosed structure allows the tool to operate reliably even in relatively harsh pipeline construction environments with dust, mud, sand, and metal shavings. Simultaneously, the gears and bearings inside the drive seat 56 are lubricated with grease, and the enclosed space inside the drive seat 56 prevents grease leakage, ensuring proper lubrication of the gear transmission components.

[0051] 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 offer a longer lifespan. Figure 7 As shown, the reducer 52 is a three-stage planetary structure, which is installed inside 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 planet carrier 523, a first-stage planetary gear 524, a second-stage planet carrier 525, a second-stage planetary gear 526, a third-stage planet 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 installed close to the inner wall of the reduction mounting part 132. There are multiple first-stage planetary gears 524. Multiple 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. Multiple second-stage planetary gears 526 are mounted on the second-stage planetary carrier 525 and mesh with the first-stage planetary carrier 523. Multiple third-stage planetary gears 528 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 an insertion 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.

[0052] 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.

[0053] Furthermore, after motor 51 is inverted, as Figure 8 As shown, the air inlet 512 is located at the top and the air outlet 513 is located at the bottom. It can simultaneously dissipate heat from the motor 51, the linkage, the reducer 52 on the side, and the controller located at the bottom, thereby 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, and the air outlet was 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 and waited for it to cool down before working again).

[0054] like Figure 6 As shown, the lead screw mounting portion 131 of the mounting sleeve 13 includes a guide portion 1311 and a mounting portion 1312. The guide portion 1311 is located at the end of the mounting portion 1312 away from the reduction mounting portion 132, and its inner wall is provided with several guide grooves 1313 that mate with the movable sleeve. The mounting portion 1312 has a mounting step 1314 for mounting the lead screw 31 near the reduction mounting portion 132. The end of the lead screw 31 near the reducer 52 is provided with a mounting plate 32 (e.g., ...) integrally or separately. Figure 2 or Figure 3 As shown, the mounting plate 32 and the lead screw 31 are integrally set (making installation less prone to errors and wear). A flat thrust bearing 331 (also known as a flat 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 flat thrust bearing 331. One end of the lead screw 31 passes through the deep groove ball bearing 332 (also known as a ball bearing) and is connected to the reducer 52. The use of the flat thrust bearing 331 not only allows for a stable installation between the lead screw 31 and the mounting part 1312 in cooperation with the deep groove ball bearing 332, but also counteracts the recoil force in the axial direction of the lead screw 31, making the force on the lead screw 31 more stable and protecting the lead screw 31.

[0055] like Figure 10As shown, the sensing mechanism 60 is installed between the mounting sleeve 13 and the movable sleeve, and includes 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 formed or separately connected. 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 configured as a separate unit, for example: Figure 9 As shown, the lead screw nut 35 has a through hole 351 in the middle for the lead screw 31 to pass through, and a 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, and a connector 341 is formed at the closed end, such as... Figure 6 As shown, the connector 341 extends beyond the mounting sleeve 13 and is fixed to the roller seat 21 by the 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.

[0056] like Figure 10 As shown, the open end of the push rod 34 extends into the through hole 351 of the lead screw nut 35 to form an extension end 342. This extension 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.

[0057] like Figure 10 As shown, 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 in 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.

[0058] 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. Figure 9 As shown, the push rod 34 moves in the pushing direction by relying on 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 characteristics 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 relying on the end structure of the screw nut 35 and the limiting clip 37 acting on the extension end 342 to pull back. At this time, the force is relatively small and it is not easy to affect the service life of the limiting clip 37.

[0059] like Figure 10 and Figure 11 As shown, 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 provided between the spiral groove 354 and the threaded section 311. An installation hole 355 is provided on the lead screw nut 35 for installing 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). The guide groove 1313 (which can also be a spline groove structure that mates with spline teeth) provided on the inner wall of the guide portion 1311 can mate with the slide bar 358, so that the lead screw nut 35 can move smoothly axially along the inner wall of the guide portion 1311 of the mounting sleeve 13, which plays a good guiding and stabilizing role.

[0060] 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.

[0061] The mounting sleeve 13 is installed inside the housing 11, such as Figure 13As shown, a mounting recess 1315 is provided on the outer peripheral surface of the mounting portion 1312, and the sensor 62 is fixed in the mounting recess 1315 by screws 621. In this embodiment, the outer shape of the mounting recess 1315 resembles a racetrack, and the sensor 62 is embedded. To facilitate the sensing between the sensor 62 and the sensing element 61 and improve the sensing accuracy, the sensing element 61 is installed on the peripheral surface of the lead screw nut 35 near the bottom, corresponding to the position of the sensor 62. The sensor 62 is installed on the mounting sleeve 13, which is closer to the controller. Furthermore, since the mounting sleeve 13 is built into the housing 11 and remains relatively fixed relative to the housing 11, even if the working angle of the pressure connector needs to be adjusted during use, it will not affect the sensor 62, thus ensuring the normal use of the sensor 62. The mounting sleeve 13 has a positioning groove 134 formed by an inward recess on the outer peripheral surface at the connection between the lead screw mounting portion 131 and the deceleration mounting portion 132, which is used for positioning and installation with the inside of the housing.

[0062] 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.

[0063] 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.

[0064] like Figure 6 As shown, 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 disengaging from the lead screw 31, thus making the structure more stable.

[0065] like Figure 14As shown, one end of the pliers 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 may be a screw) is provided on the peripheral side of the pliers head seat 12. The limiting member 122 has a limiting head that protrudes from the outer peripheral surface of the pliers 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 pliers head seat 12, thereby limiting the rotation angle of the pliers 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 one limiting protrusion 113 is provided, 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... Figure 14 In the pliers, two limiting protrusions 113 are arranged, allowing the pliers head seat 12 to rotate at an angle of approximately 180°. Therefore, the number of limiting protrusions 113 can be set according to the actual required rotation angle of the pliers head seat 12.

[0066] 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.

[0067] In this embodiment, the working mechanism (i.e., roller base 21 and roller 22) has a first initial position, a second initial 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 full-stroke position, and a second mode that allows the working mechanism to move from the second initial position to the full-stroke position. The first initial position is the starting position of the working mechanism when the tool is in the first mode. After officially starting work in the first mode, the working mechanism will move from the first initial position. When the working part completes the pressing (or shearing, etc.) of the pipe fitting, 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, it will first move from its current position to the first initial position before officially starting 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.

[0068] 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.

[0069] 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... Figure 11As shown, sensor 62 also has two sensing points: 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 driven by the movable sleeve (lead screw nut 35 and push rod 34), the first initial position, second initial position, work completion position, and full stroke position of the working mechanism all have corresponding positions during the movement of the movable sleeve. The sensing element 61 is mounted on the lead screw nut 35; therefore, the sensing element 61 also has corresponding first initial sensing position, second initial sensing position, work completion sensing position, and full stroke sensing position as it moves with 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 sensor 62, and relevant signals are sent to the control module, thereby further controlling the tool's operation based on the position of the sensing element 61.

[0070] During the tool's operation, the movement of the working mechanism, movable sleeve, and sensing components includes the following stages:

[0071] 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.

[0072] 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.

[0073] 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.

[0074] 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.

[0075] In this embodiment, 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 suitable for small-sized working parts, and the second initial position is suitable for large-sized working parts. When the small-sized working part is installed on the clamp head holder 12, and mode one is selected, if the working mechanism is exactly in the first initial position at this time, it will start moving directly from the first initial position to work after the master control switch is turned on. If the working mechanism is not in the first initial position at this time, after the master control switch is turned on, the working mechanism will first move from the current position to the first initial position, and then start moving from the first initial position to work. After the work is completed, 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.

[0076] <Example 2>

[0077] This embodiment is based on the above embodiment 1, such as Figure 13As shown, the mounting recess 1315 for mounting the sensor 62, which is opened in the middle of the mounting sleeve 13, has a shape with one end being semi-circular and the other end being straight. The design of different shapes at the two ends can prevent incorrect installation during installation.

[0078] <Example 3>

[0079] This embodiment is basically the same as embodiments 1-2 above, except that in embodiments 1-3 above, the lead screw 31 and its mounting plate 32 are integrally formed, while in this embodiment, as shown below... Figure 15 As shown, a mounting plate 32 is separately fitted onto 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 split structure facilitates disassembly and replacement, and results in less waste and lower cost during processing.

[0080] <Example 4>

[0081] This embodiment is basically the same as embodiments 1-3 above, except for the limiting structure during the rotation of the clamp head seat 12, such as... Figure 16 As shown, one end of the pliers 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. The top of the housing 11 has 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 has a limiting element 122 (which can be a screw). The projections of the limiting flange 112 and the limiting element 122 in the axial direction overlap. Since the pliers head seat 12 and the mounting sleeve 13 are threadedly connected, when the pliers head seat 12 is rotated, the pliers head seat 12 will move axially relative to the mounting sleeve 13. The cooperation between the limiting flange 112 and the limiting element 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.

[0082] <Example 5>

[0083] This embodiment is basically the same as the embodiments 1-4 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.

[0084] <Example 6>

[0085] Based on embodiments 1-5 above, this embodiment proposes a new working component mounting structure, such as... Figure 17 As shown, the working part (crimping pliers 40) is detachably mounted on the pliers head base 12 via a mounting assembly, which includes a pin 71, a limit block 72, a limit button 73, a spring 74, and a reset component, as shown. Figure 18 As shown, both the pliers head base 12 and the pair of connecting plates 43 have a pair of through holes. A limit block 72 is fixed to one side of the pliers head base 12, and a pair of limit buttons 73 are movably mounted on the limit 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 limit button 73. The other end is exposed on the pliers head base 12 via a spring 74. A limit groove 711 is formed at the end of the pin 71 near the limit block 72. The inner end of the limit button 73 is provided with a limit hook 731 that can be hooked into the limit groove 711. A reset member (not shown in the figure) is provided between the limit button 73 and the limit 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.

[0086] Functions and effects of the examples:

[0087] According to the power tool mounting 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 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. 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.

[0088] 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.

[0089] 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.

[0090] 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.

[0091] 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.

[0092] 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.

[0093] 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.

[0094] 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.

[0095] 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 above embodiments, the push rod and the lead screw nut are separate components; in practice, the push rod and the lead screw nut can be integrated. In the above embodiments, the working component is a crimping pliers; in practice, it can 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 practice, more initial positions and corresponding sensing points can be provided according to actual needs. The above embodiments are applied to vertical power tools where the working mechanism, motor assembly, control module, and power supply are arranged vertically; in practice, they can also be applied to pistol-type power tools.

Claims

1. An attachment device of a power tool, provided in a power tool, for attaching a working member of the power tool, characterized by, The utility model relates to a kind of electric tool, including: Jaw holder, with open slot for installing the working component; Protective sleeve, slidingly disposed on the outer periphery of the jaw holder, for shielding the outside of part of the open slot; And Limiting mechanism, disposed between the jaw holder and the protective sleeve.

2. The mounting device of the power tool according to claim 1, characterized by The limiting mechanism includes an axial limiting component with a limiting steel ball disposed on the jaw holder and a return spring, and the protective sleeve is provided with at least two limiting holes disposed along the sliding direction and cooperating with the limiting steel ball.

3. The mounting device of the power tool according to claim 2, characterized by The limiting mechanism also includes a radial limiting component with a limiting groove opened on the inner wall of the protective sleeve along the axial direction and a limiting steel ball embedded in the jaw holder, which can relatively roll along the limiting groove.

4. The mounting device of the power tool according to any one of claims 1 to 3, characterized in that, A pair of handles are provided on the outside of the protective sleeve corresponding to the open slot, and a groove is provided on the side of the handles facing the working component.

5. A multi-stage power tool body characterized by, The utility model relates to a kind of electric tool, including: Housing; Drive device, mounted on the housing; And Mounting device, mounted on the drive device; Wherein, the mounting device is the mounting device of the electric tool as claimed in any one of claims 1-4, one end of the jaw holder extends into the housing, the other end extends out of the housing to form an exposed part for mounting the working component, and the drive device is used to drive the working component to work.

6. The multi-segment power tool body of claim 5, wherein, The drive device includes: Mounting sleeve, built-in in the housing, and one end is rotatably connected with the jaw holder; Working mechanism, movably disposed on the jaw holder, for driving the working component to work, and at least having a first initial position, a second initial position and a full stroke position;And Control module, at least having a first mode capable of moving the working mechanism from the first initial position to the full stroke position and a second mode capable of moving the working mechanism from the second initial position to the full stroke position.

7. The multi-segment power tool body of claim 6, wherein, The drive device also includes: Pushing mechanism, mounted on the mounting sleeve, for pushing the working mechanism to move; Sensing mechanism, having a sensor and a sensing piece; Wherein, the pushing mechanism has: Lead screw, rotatably disposed in the mounting sleeve; Movable sleeve, movably sleeved on the outside of the lead screw, and connected with the working mechanism;And Motor assembly, for driving the lead screw to rotate, the lead screw rotates to drive the movable sleeve to move axially; The sensing piece is installed on one end of the movable sleeve away from the working mechanism, and the sensor is installed on the mounting sleeve, and the sensor has at least a first sensing point and a second sensing point.

8. The multi-segment power tool body of claim 7, wherein, 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 a linkage installed between the motor and the speed reducer and a driving seat for covering the linkage, and the driving seat has: Connecting flange, containing a first mounting part for mounting the motor and a second mounting part for mounting the speed reducer; An end cover is arranged at the bottom of the connecting flange; A receiving cavity is formed between the end cover and the connecting flange to accommodate the linkage, which has: A motor output wheel is mounted on the motor shaft of the motor; A reducer input wheel is connected to the reducer, and An idler wheel connects the motor output wheel and the reducer input wheel.

9. The multi-segment power tool body of claim 8, wherein, A needle bearing is embedded in the middle of the idler wheel, and a mounting shaft is arranged in the middle of the needle bearing, one end of which is inserted into the connecting flange, and the other end is inserted into the end cover. A gasket is arranged between the two end faces of the idler wheel and the connecting flange and the end cover.

10. A multi-stage power tool characterized by, It comprises: At least two working components, A main body, a multi-section electric tool main body as claimed in any one of claims 5-9, The at least two working components are alternatively mounted on the main body for use.

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