Electric tool body and electric tool

Abstract

The present application relates to an electric tool body and an electric tool. The electric tool body comprises: a mounting sleeve; a driving portion, which acts on a working component; a pushing portion, which is configured to push the driving portion to move; and a sensing portion. The pushing portion comprises: a lead screw, which is rotatably arranged in the mounting sleeve; and a movable sleeve, which is arranged on the outer side of the lead screw and is connected to the driving portion. The sensing portion comprises: a sensing member, which is mounted at the end of the movable sleeve away from the driving portion; and a sensor, which is mounted on the mounting sleeve and is configured to cooperate with the sensing member. In the present application, the sensor is mounted on the mounting sleeve; during the use of the tool, when it is necessary to adjust the mounting direction of the working component by rotating a mounting base (a structure for mounting the working component), the sensor mounted on the mounting sleeve remains unaffected no matter how the mounting base is rotated, providing protection for the sensor, and thereby ensuring the normal operation of the sensor.

Description

Power tool body and power tools Technical Field

[0001] This utility model belongs to the field of power tool technology, specifically relating to a power tool body and a 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] The applicant's prior utility model patent application CN116810725A discloses an electric crimping tool, which has a sensor on a roller seat and a sensor mounted on a mounting base. The sensor is connected to a controller located at the bottom of the tool body via a connecting line. During operation, the roller seat moves under the drive of the drive mechanism. Therefore, by sensing the position of the sensor, it can be determined whether the roller seat is in its initial position and whether it can work normally. However, in actual use, the applicant found a problem with the above structure: for example, in some special installation conditions, it is necessary to adjust the working direction by rotating the mounting base (including the crimping pliers, roller seat, etc. mounted on it). During the rotation, since the mounting base rotates relative to the main body, the connecting line on the sensor is prone to getting tangled or even broken along the main body and the mounting base, making the sensor unusable and affecting the normal use of the tool. Summary of the Invention

[0004] To solve the above problems, this utility model provides a power tool body and a power tool in which a sensor is mounted on a mounting sleeve to protect the sensor.

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

[0006] A power tool body, disposed within a power tool, for driving the working parts of the power tool to perform operations, is characterized by comprising: a housing; a mounting sleeve, mounted within the housing and fixed relative to the housing; a drive unit acting on the working parts; a push unit for driving the drive unit to move; and a sensing unit; wherein the push unit has: a lead screw rotatably disposed within the mounting sleeve; a movable sleeve movably disposed outside the lead screw and connected to the drive unit; the sensing unit has: a sensing element mounted on the movable sleeve at the end away from the drive unit; and a sensor mounted on the mounting sleeve for cooperating with the sensing element.

[0007] The power tool body proposed in this utility model also includes: a drive motor and a reducer, one end of which is mounted on the output shaft of the drive motor and the other end is connected to a lead screw. The mounting sleeve has: a lead screw mounting part for mounting the lead screw and a reducer mounting part integrally formed with the lead screw mounting part for mounting the reducer.

[0008] The power tool body proposed in this utility model also has the following features: 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 located at one end of the guide part near the deceleration mounting part. The mounting part has a mounting step inside for mounting the lead screw, and a sensor is mounted on the outer peripheral wall of the mounting part.

[0009] The electric tool body proposed in this utility model also has the following feature: an annular mounting plate is integrally or separately formed at the end of the lead screw near the reducer; a planar thrust bearing is provided between the annular mounting plate and the mounting step; a deep groove ball bearing is provided on the side of the mounting step away from the planar thrust bearing; and one end of the lead screw passes through the deep groove ball bearing and is combined with the reducer.

[0010] The power tool body proposed in this utility model also has the following features: the drive unit has: a pair of rollers for acting on the working parts; a roller seat for mounting the pair of rollers; 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 set 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.

[0011] The power tool body proposed in this utility model also has the following features: when the lead screw nut and push rod are separately set, the lead screw nut has a through hole in the middle for the lead screw to pass through, and the end of the push rod away from the roller seat has an extension end that extends into the through hole. The through hole has a working surface for abutting against one end face of the extension end. The inner wall of the through hole is also recessed circumferentially on the side of the working surface to form a groove. A limiting clip is installed in the groove, and the extension end is located between the limiting clip and the working surface. Alternatively, the through hole has a locking hole on the side of the working surface, and a locking pin is provided in the locking hole to connect the movable sleeve to the extension end.

[0012] The power tool body proposed in this utility model also has the following feature: a motor base is provided at one end of the drive motor near the reducer, and the motor base is mounted together with the end face of the reducer mounting part by a fastener.

[0013] The power tool body proposed in this utility model also includes: a control switch mounted on the housing; a controller mounted inside the housing; a power supply detachably mounted on the housing; and a mounting base rotatably mounted on a mounting sleeve, with one end extending out of the housing for mounting working parts; wherein the sensor, control switch, drive motor, and power supply are all electrically connected to the controller.

[0014] The power tool body proposed in this utility model also has the following feature: a display screen is provided on the outer shell near the controller.

[0015] This utility model also proposes an electric tool, which includes: a main body and a working part, which is detachably mounted on the main body and works under the drive of the main body, wherein the main body is the electric tool body as described above.

[0016] Functions and effects of utility models

[0017] According to the power tool body of this utility model, since the sensor is installed on the mounting sleeve, when the installation direction of the working part needs to be adjusted by rotating the mounting base (the structure for installing the working part) during the use of the tool, the sensor installed on the mounting sleeve will not be affected no matter how the mounting base is rotated, thus protecting the sensor and ensuring that the sensor can be used normally. Attached Figure Description

[0018] Figure 1 is a structural diagram of the electric crimping tool of Embodiment 1 of this utility model.

[0019] Figure 2 is a structural diagram of the power tool body of this utility model after removing part of the outer shell.

[0020] Figure 3 is a cross-sectional view of the mounting structure of the mounting base and drive mechanism in Embodiment 1 of this utility model.

[0021] Figure 4 is a simplified structural diagram of the lead screw of this utility model.

[0022] Figure 5 is a simplified structural diagram of the mounting sleeve in Embodiment 1 of this utility model.

[0023] Figure 6 is a schematic diagram of the roller seat installation structure of this utility model.

[0024] Figure 7 is a simplified structural diagram of the lead screw nut of this utility model.

[0025] Figure 8 is a magnified view of part A in Figure 3.

[0026] Figure 9 is a cross-sectional view of the lead screw nut of this utility model.

[0027] Figure 10 is a magnified view of section B in Figure 3.

[0028] Figure 11 is a schematic cross-sectional view of the push rod and lead screw nut installation structure of Embodiment 2 of this utility model.

[0029] Figure 12 is a simplified structural diagram of the mounting sleeve in Embodiment 3 of this utility model.

[0030] Figure 13 is a cross-sectional view of the lead screw installation structure in Embodiment 4 of this utility model.

[0031] Reference numerals: Electric crimping tool 100, main body 10, outer shell 11, display screen 12, working mechanism 20, crimping pliers 21, gripper 211, notch 212, mounting base 22, mounting section 221, drive mechanism 30, roller 31, roller seat 32, screw 321, lead screw 33, threaded section 331, annular mounting plate 332, push rod 34, connector 341, extension end 342, lead screw nut 35, through hole 351, mounting groove 352, working surface 353, spiral groove 354, mounting hole 355, reverser 356, slot 357, slide bar 358, pin 359, mounting sleeve 36, mounting notch 361, lead screw mounting part 362, guide part 3621, mounting plate 362, etc. Components include: 3622 (mounting part), 3623 (guide groove), 3624 (mounting step), 363 (reduction mounting part), 37 (limiting clip), 38 (bearing), 381 (circlip), 39 (ball), 40 (power supply), 41 (control board), 51 (drive motor), 511 (output shaft), 512 (motor base), 513 (motor gear), 522 (reducer), 521 (first-stage internal gear ring), 522 (second and third-stage internal gear rings), 523 (first-stage planetary carrier), 524 (first-stage planetary gear), 525 (second-stage planetary carrier), 526 (third-stage planetary carrier), 527 (third-stage planetary gear), 528 (third-stage planetary carrier), 53 (flat thrust bearing), 54 (deep groove ball bearing), 61 (sensor), 621 (screw), 63 (wire), 71 (button), 72 (switch element), and 73 (wire). Detailed Implementation

[0032] To make the technical means, creative features, objectives and effects of this utility model easy to understand, the following describes the power tool body and power tool of this utility model in detail with reference to the embodiments and accompanying drawings.

[0033] <Example 1>

[0034] As shown in Figure 1, this embodiment proposes a power tool, particularly an electric crimping tool 100. The electric crimping tool 100 includes a main body 10 and a working part. The main body 10 is a power tool body, and the working part is a crimping clamp 21. The crimping clamp 21 is detachably installed at the front end of the main body 10 and can perform crimping work on pipes under the drive of the main body 10.

[0035] As shown in Figure 2, the main body 10 includes at least a housing 11, a working mechanism 20 acting on the crimping clamp 21, a drive mechanism 30 for driving the working mechanism 20, a control mechanism for controlling the drive mechanism 30, and a switching mechanism. In this embodiment, the housing 11 is a vertically extending shell formed by two half-shells fixed together by screws. It is hollow inside for mounting the drive mechanism 30. The crimping clamp 21 is mounted at the front end (which can be the top end), and the control mechanism is mounted at the rear end (which can be the bottom end). The control mechanism has a power supply 40 for power supply and a control board 41, etc. The switching mechanism has a button 71 and a switching element 72 mounted on the housing 11. The switching element 72 is electrically connected to the control board 41 through a wire 73. Pressing the button 71 pushes the internal switching element 72 to open.

[0036] The power supply 40 is detachably mounted at the bottom of the housing 11. The control board 41 and the drive mechanism 30 are mounted inside the housing 11. The control board 41 is located at the bottom opening of the housing 11 for easy connection to the power supply. A display screen 12 is provided on the outer side of the bottom of the housing 11 near the control board 41 to display relevant working information of the tool. The drive mechanism 30 is mounted above the control board 41, and the working mechanism 20 is mounted at the front end of the drive mechanism 30 and extends out of the housing 11. The working mechanism 20 has a mounting base 22, and the crimping pliers 21 has a pair of symmetrically arranged jaws 211. The front end of the jaws 211 forms a notch 212 for clamping the workpiece. The pair of jaws 211 can rotate under the drive of the drive mechanism 30, thereby crimping the workpiece in the notch 212. The rear end of the mounting base 22 is located inside the housing 11 and is provided with a mounting section 221 for mounting the drive mechanism 30. The front end extends out of the housing 11 and is detachably connected to the crimping pliers 21 for easy disassembly and replacement of the crimping pliers 21.

[0037] As shown in Figure 3, the drive mechanism 30 includes a pusher for moving the drive unit, a drive motor 51 and a reducer 52 for driving the pusher, a sensing unit, and a mounting sleeve 36. The drive unit has a pair of rollers 31 acting on the crimping clamp 21 and roller seats 32 for mounting the rollers 31. The pusher has a lead screw 33 and a movable sleeve. The lead screw 33 is installed inside the mounting sleeve 36. One end of the reducer 52 is connected to the lead screw 33, and the other end is mounted on the output shaft 511 of the drive motor 51, which is also built into the mounting sleeve 36. The drive motor 51 has a motor seat 512 at the end where the output shaft 511 is located. The motor seat 512 is fixed to the end of the mounting sleeve 36 by screws. The drive motor 51 is electrically connected to a control board, which controls the drive motor to operate. The lead screw 33 rotates under the drive of the drive motor 51, i.e., the reducer 52.

[0038] As shown in Figure 4, the lead screw 33 has a threaded section 331 formed on its outer circumference. The movable sleeve is fitted on the threaded section 331. During the rotation of the lead screw 33, the movable sleeve moves axially along the lead screw 33 under the action of the threaded section 331. One end of the movable sleeve extends out to the mounting sleeve 36 and is fixed to the roller seat 32 of the push part. When the movable sleeve moves axially, it will drive the roller seat 32 and the roller 31 to move, thereby realizing the operation of the crimping pliers 21.

[0039] The sensing unit includes a sensing element 61 and a sensor 62. The sensing element 61 is a sensing magnet, installed on the end of the movable sleeve away from the pushing part. The sensor 62 is a Hall sensor, installed on the mounting sleeve 36, used to sense the position of the sensing magnet, and electrically connected to the control board 41 via a wire 63. The sensor 62 transmits signals to the control board 41, which then controls the drive motor 51 to operate. As shown in Figure 2, the mounting sleeve 36 is installed inside the outer casing 11. A mounting recess 361 is formed on the outer circumferential surface of the middle part of the mounting sleeve 36, and the sensor 62 is fixed in the mounting recess 361 by screws 621. The sensing element 61 has an initial zero position. When the sensing element 61 is in the initial zero position, the crimping clamp is in an open state. When the tool is started, the motor first reverses to return the driving part to the initial zero position, and then rotates forward to control the roller to extend, causing the crimping clamp to gradually close and crimp the workpiece.

[0040] In this embodiment, as shown in Figures 3, 5, and 10, the mounting sleeve 36 is an integral sleeve structure, comprising a lead screw mounting portion 362 and a reduction gear mounting portion 363. The lead screw mounting portion 362 is used to mount the lead screw 33, and the reduction gear mounting portion 363 is integrally formed with the lead screw mounting portion 362 for mounting the reducer 52. In other words, the gearbox housing for mounting the reducer 52 and the mounting housing for mounting the lead screw are made into an integral 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. The lead screw mounting part 362 includes a guide part 3621 and a mounting part 3622. The guide part 3621 is located at the end of the mounting part 3622 away from the reduction mounting part 363, and its inner wall has several guide grooves 3623 that mate with the movable sleeve. The mounting part 3622 has a mounting step 3624 for mounting the lead screw 33 inside. An annular mounting plate 332 is integrally provided on the end of the lead screw 33 near the reducer 52 (as shown in Figure 4, the annular mounting plate 332 and the lead screw 33 are integrally set), adopting an integrated structure that is simple and stable. A planar thrust bearing 53 (also called a planar needle roller bearing) is provided between the annular mounting plate 332 and the mounting step 3624. A deep groove ball bearing 54 is provided on the side of the mounting step 3624 away from the planar thrust bearing 53. One end of the lead screw 33 passes through the deep groove ball bearing 54 (also called a ball bearing) and is connected to the reducer 52. The use of a planar thrust bearing 53 not only allows for stable installation between the lead screw 33 and the mounting part 3622 when it is matched with the deep groove ball bearing 54, but also counteracts the recoil force in the axial direction of the lead screw 33, making the lead screw 33 more stable under force and protecting the lead screw 33.

[0041] The mounting recess 361 for mounting the sensor 62 is provided on the outer wall of the mounting part 3622. In this embodiment, the outer shape of the mounting recess resembles a racetrack. The sensor 62 is embedded in the recess. Mounting the sensor 62 here allows it to be closer to the control board 41. Furthermore, since the mounting sleeve 36 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.

[0042] The movable sleeve includes a push rod 34 and a lead screw nut 35, which can be integrally set or separately combined. In this embodiment, the separate set is taken as an example: the lead screw nut 35 has a through hole 351 in the middle for the lead screw 33 to pass through, and a sensing element 61 is installed on the outer peripheral surface 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 6. The connector 341 extends out of the mounting sleeve 36 and is fixed to the roller seat 32 by a screw 321, thereby realizing the connection between the push rod 34 and the roller seat 32. The push rod 34 is hollow inside, and the open end is sleeved on the outside of the end of the lead screw 33 away from the reducer 52.

[0043] As shown in Figure 8, the open end of the push rod 34 extends into the through hole 351 of the lead screw nut 35 to form 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 32). During the rotation of the lead screw 33, the push rod 34 can drive the roller seat 32 to move, thereby causing the roller 31 to push the crimping clamp 21 to work. During the movement, the roller 31 will contact the inner end of the clamp 211. Under the pushing force of the roller 31, the clamp 211 will rotate around the central axis, thereby causing the crimping clamp 21 to close and crimp the workpiece. Since the structure and principle of using a roller to drive the crimping clamp is existing technology, it will not be described in detail here. The mounting sleeve 36 is located on the outside of the lead screw 33, push rod 34, and lead screw nut 35. Its end is connected to the mounting base 22. The end of the mounting sleeve 36 near the roller seat 32 is threaded to the mounting section 221 of the mounting base 22. The interior of the mounting sleeve 36 is hollow, which encloses the lead screw 33 and lead screw nut 35 inside the guide sleeve 36. A gap is formed between the inner wall of the mounting sleeve 36 and the outer wall of the lead screw 33 to allow the push rod 34 and lead screw nut 35 to move, so that the push rod 34, lead screw nut 35 and mounting sleeve 36 form a relatively sealed space. The lead screw 33 is located in this sealed space, which further seals and protects the lead screw 33, preventing dust and impurities from entering and affecting the accuracy of the lead screw.

[0044] As shown in Figures 7-9, 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 32 under the action of the lead screw 33. As shown in Figure 8, 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.

[0045] The push rod 34 has two directions of movement: one is the direction that pushes the roller seat 32 toward the crimping clamp 21, called the pushing direction; the other is the opposite direction, called the retraction direction. As shown in Figure 8, 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.

[0046] As shown in Figures 3 and 9, the inner wall of the through hole 351 is provided with a threaded mating part (i.e., a spiral groove 354) that mates with the threaded section 331 on the surface of the lead screw 33. A ball 39 (steel ball) is provided between the threaded mating part and the threaded section 331. 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 33. 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 3623 (which can also be a spline groove structure that mates with spline teeth) provided on the inner wall of the guide portion 3621 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 3621 of the mounting sleeve 36, providing good guidance and stability.

[0047] As shown in Figure 3, a bearing 38 is also fitted at one end of the lead screw 33 inside the push rod 34. The bearing 38 is fixed to the lead screw 33 by a snap ring 381. The bearing 38 is located between the top of the lead screw 33 and the inner wall of the push rod 34. This not only makes the rotation of the lead screw 33 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 33, thus making the structure more stable.

[0048] As shown in Figures 3 and 10, the control motor 51 in this embodiment is a sensorless brushless motor. Compared with traditional sensored motors (with Hall effect sensors), sensorless brushless motors reduce wiring and components. In high-power power tools, where heat easily affects electrical components, sensorless brushless motors have a longer lifespan. The sensorless brushless motor includes an output shaft 511, on which a motor gear 513 is mounted, and a reducer 52 is mounted on the motor gear 513. Specifically, the reducer 52 is a three-stage planetary structure, which is installed inside the reduction mounting part 363 of the mounting sleeve 36. 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 installed close to the inner wall of the reduction mounting part 363. The first-stage planetary gear 524 is installed on the first-stage planetary carrier. On 523, the first-stage planetary gear 524 meshes with the motor gear 513, the second-stage planetary gear 526 is mounted on the second-stage planetary carrier 525 and meshes with the first-stage planetary carrier 523, the third-stage planetary gear 528 is mounted on the third-stage planetary carrier 527 and meshes 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 33 to be inserted, the lower end of the lead screw 33 is secured in the middle of the third-stage planetary carrier 527 by a snap ring, and the deep groove ball bearing 54 is provided between the top of the third-stage planetary carrier 527 and the mounting step 3624.

[0049] The working principle of this embodiment:

[0050] Press button 71 to start the tool. The motor first reverses, driving the lead screw 33 to rotate in the opposite direction, causing the push rod 34 to drive the drive unit back to the initial zero position. After the sensor 62 detects that the sensing element 61 has returned to the initial zero position, it transmits a signal to the control board 41. The control board 41 controls the motor to rotate forward, and the lead screw 33 rotates in the forward direction, causing the push rod 34 to drive the drive unit to move in the direction of the crimping clamp 21. The roller 31 contacts and drives the clamping jaws 211 of the crimping clamp 21 to rotate, and crimps the workpiece.

[0051] <Example 2>

[0052] This embodiment is basically the same as Embodiment 1 above, except that the connection structure between the extension end 342 of the push rod 34 and the lead screw nut 35 is different. As in Embodiment 1 above, the lead screw nut 35 has a through hole 351 in the middle for the lead screw 33 to pass through. The end of the through hole 351 near the push rod 34 is provided with a mounting groove. The bottom of the mounting groove forms an annular working surface 353. The working surface 353 abuts against the end face of the extension end of the push rod 34. The two interact with each other, so that the lead screw nut 35 can push the push rod 34 towards the roller seat 32 under the action of the lead screw 33. As shown in Figure 11, the specific installation structure of the lead screw nut 35 and the push rod 34 in this embodiment is as follows: a pin 359 is provided on one side of the through hole 351 located on the working surface 353. One end of the pin 359 is inserted into the extension end 342 of the push rod 34, and the lead screw nut 35 and the push rod 34 are connected by the pin 359. The push rod 34 has two directions of movement: one is the direction that pushes the roller seat 32 toward the crimping clamp 21, called the advancing direction; the other is the opposite direction, called the retracting direction. The push rod 34 moves in the advancing direction by the action surface 353 of the lead screw nut 35 acting on the end face of the extension end 342 of the push rod 34; the push rod 34 moves in the retracting direction by the action of the pin 359 on the lead screw nut 35 acting on the extension end 342 to pull it back.

[0053] <Example 3>

[0054] This embodiment is basically the same as embodiments 1 and 2 above. The difference is the shape of the mounting notch 361 for mounting the sensor 62 in the middle of the mounting sleeve 36. In embodiment 1, as shown in Figure 5, the shape of the mounting notch 361 is a racetrack shape with both ends being semicircular. In this embodiment, as shown in Figure 12, the shape of the mounting notch 361 is semicircular at one end and straight at the other end. The different shapes at both ends can prevent incorrect installation during installation.

[0055] <Example 4>

[0056] This embodiment is basically the same as embodiments 1-3 above, except that in embodiments 1-3, the lead screw 33 and its annular mounting plate 332 are integrally formed. In this embodiment, as shown in Figure 13, the annular mounting plate 332 is separately fitted on the outer periphery of the lead screw 33 above the mounting step 3624 of the mounting sleeve 36. The annular mounting plate 332 has a "convex" shaped cross-section, with a large end 332a and a small end 332b with a smaller outer diameter. A planar thrust bearing 53 is provided between the outer periphery of the small end 332b and the inner wall of the mounting sleeve 36. The separate structure facilitates disassembly and replacement.

[0057] Functions and effects of the examples:

[0058] According to the power tool and main body of the above embodiment, since the sensor 62 is mounted on the mounting sleeve 36 and the corresponding sensing element 61 is mounted on the movable sleeve, when the tool needs to adjust the installation direction of the working part by rotating the mounting base 22 (the structure for mounting the working part) during use, no matter how the mounting base 22 rotates, it will not affect the sensor 62 mounted on the mounting sleeve 36 (that is, the wire connecting the sensor 62 to the control board will not be tangled or broken due to rotation), thus protecting the sensor 62 and ensuring that the sensor 62 can be used normally.

[0059] Furthermore, the integrated design of the mounting sleeve 36 for mounting the lead screw 33 and the reducer 52 eliminates the need for a separate reducer 52 housing, simplifying the structure, reducing costs, and making the entire lead screw 33 rotation structure more stable.

[0060] Furthermore, since the lead screw 33 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 33, 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 33, thus protecting the lead screw 33.

[0061] 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.

[0062] 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 power tools, where heat can easily affect electrical components, the sensorless brushless motor has a longer lifespan.

[0063] 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 scenario provided in the above embodiments, the push rod and the movable sleeve are separate components; in actual situations, the push rod and the movable sleeve can also be integrated. In the scenario provided in the above embodiments, the working component is a crimping pliers; in actual situations, it can also be replaced with a shearing head or other working components, i.e., the working component can be replaced according to different working environments and requirements.

Claims

1. A power tool body, disposed within a power tool, for driving the working parts of the power tool to perform operations, characterized in that, include: shell; The mounting sleeve is installed inside the housing and fixed relative to the housing; The drive unit acts on the working component; A driving part, used to drive the driving part to move; and Sensing unit; The pushing part has: The lead screw is rotatably mounted inside the mounting sleeve; A movable sleeve is provided on the outside of the lead screw and is connected to the drive unit; The sensing component has: The sensor is installed at the end of the movable sleeve furthest from the drive unit. The sensor is mounted on the mounting sleeve and is used to cooperate with the sensing element.

2. The power tool body according to claim 1, characterized in that, Also includes: Drive motor, The speed reducer is mounted on the output shaft of the drive motor at one end and connected to the lead screw at the other end. The mounting sleeve has the following features: Lead screw mounting part, used to mount the lead screw. The speed reduction mounting part is integrally formed with the lead screw mounting part and is used to install the speed reducer.

3. The power tool body according to claim 2, characterized in that, The lead screw mounting part includes: The guide section has a guide groove on its inner wall that mates with the movable sleeve. The mounting section has an internal mounting step for mounting the lead screw, and the sensor is mounted on the outer peripheral wall of the mounting section.

4. The power tool body according to claim 3, characterized in that, in, The lead screw is provided with an integral or separate annular mounting plate at one end near the reducer. A planar thrust bearing is provided between the annular mounting plate and the mounting step. A deep groove ball bearing is provided on the side of the mounting step away from the planar thrust bearing. One end of the lead screw passes through the deep groove ball bearing and is combined with the reducer.

5. The power tool body according to any one of claims 1-4, characterized in that, The drive unit has: A pair of rollers, for action on the working part, Roller seat, for mounting the pair of rollers, The active sleeve has: The push rod has one end inserted into the mounting sleeve and fitted around the outer circumference of the lead screw, and the other end extending out of the mounting sleeve and fixed to the roller seat. The lead screw nut is movably sleeved on the outer circumference of the lead screw, and is either integrally formed with or separate from the end of the push rod away from the roller seat. The sensing element is installed on the outer peripheral surface of the lead screw nut.

6. The power tool body according to claim 5, characterized in that, When the lead screw nut and the push rod are separately set, the lead screw nut has a through hole in the middle for the lead screw to pass through, and the end of the push rod away from the roller seat has an extension end that extends into the through hole. The through hole has a working surface for abutting against one end face of the extension end. The inner wall of the through hole is also recessed circumferentially on one side of the working surface to form a groove, in which a limiting device is installed, and the extended end is located between the limiting device and the working surface. Alternatively, a locking hole is provided on one side of the working surface of the through hole, and a locking pin is provided in the locking hole, through which the movable sleeve is connected to the inserted end.

7. The power tool body according to any one of claims 2-4, characterized in that, in, The drive motor has a motor mount at one end near the reducer, and the motor mount is installed together with the end face of the reducer mounting part by a fastener.

8. The power tool body according to any one of claims 2-4, characterized in that, Also includes: The control switch is mounted on the housing; The controller is installed inside the housing; The power supply is detachably mounted on the housing. as well as The mounting base is rotatably mounted on the mounting sleeve, and one end extends out of the housing for mounting the working component; The sensor, the control switch, the drive motor, and the power supply are all electrically connected to the controller.

9. The power tool body according to claim 8, characterized in that, in, A display screen is provided on the outer casing near the location of the controller.

10. A power tool, characterized in that, include: main body, The working component is detachably mounted on the main body and operates under the drive of the main body. The main body is the power tool body as described in any one of claims 1-9.

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