Screw rod driving structure of electric tool

Abstract

The technical scheme belongs to the technical field of pipe expansion tools, and particularly relates to a lead screw driving structure of an electric tool, which comprises a shell, an expansion assembly and a screw rod driving mechanism, the shell is internally provided with a containing cavity, and the front end of the shell is provided with an opening; the expansion assembly comprises a lead screw sleeve sliding in the containing cavity, a conical piston arranged at the front end of the lead screw sleeve and a steering sleeve. Wherein the rear end of the conical piston is sleeved with the front end of the lead screw sleeve, the steering sleeve is rotationally arranged in the containing cavity and arranged on the conical piston in a sleeving mode, and a steering mechanism is arranged between the steering sleeve and the conical piston; the driving part is installed in the containing cavity, a driven lead screw is further rotationally arranged in the containing cavity and is in threaded fit with the lead screw sleeve, the driving part drives the driven lead screw to rotate, then the conical piston is driven to rotate along the axis of the driven lead screw, in the moving process of the conical piston, the steering sleeve is driven to rotate through the steering mechanism, and the steering sleeve rotates the pipe expanding die; and the inner hole of the pipe fitting keeps roundness after being expanded, the structure is compact, and the pipe fitting is lighter and more efficient.

Description

TECHNICAL FIELD

[0001] The technical scheme relates to the technical field of pipe expanding tools, in particular to a lead screw driving structure of an electric tool. BACKGROUND

[0002] The pipe expanding tool is a kind of expanding tool used for expanding the end of a small-diameter pipe to form a trumpet mouth, a cup-shaped mouth or other required shape, so as to achieve the purpose of expanding the pipe.

[0003] As disclosed in Chinese patent CN204773556U, the patent discloses a cross-linked polyethylene expanding tool, which is operable to expand the end of a pipe, the tool having a longitudinal axis and a perpendicular axis, the tool comprising a working end portion disposed at a distal end along the longitudinal axis, the working end portion comprising a plurality of jaws movable between a closed position and an expanded position and rotatable about the longitudinal axis of the tool, the tool comprising a main body connected to the working end portion, the expanding tool comprising a housing and a cam inside the housing, the cam rotating to push the shock absorber and the shaft towards the jaws, so as to realize the expansion or contraction of the plurality of jaws, the cam being connected to an electric motor selectively operated by a user. The plurality of jaws of the existing expanding tool cooperates to form an expanding die, and the plurality of jaw portions included in the expanding die can be expanded or contracted synchronously.

[0004] The existing expanding tool is driven by a motor, and when the pipe expanding power is insufficient, the pipe cannot be deformed in shape, and it is necessary to rely on a reinforced power system to enhance the pipe expanding force. The power system is usually larger in size and heavier in weight, which will inevitably increase the weight of the entire expanding tool, reduce the flexibility and portability, and is inconvenient to use, and needs to be improved. SUMMARY

[0005] In order to improve the problem that the electric expanding tool increases the pipe expanding power and causes the weight to increase and the use to be inconvenient, the technical scheme provides a lead screw driving structure of an electric tool.

[0006] The purpose of the technical scheme is achieved as follows:

[0007] The lead screw driving structure of the electric tool comprises a housing, a containing cavity is arranged in the housing, an opening is arranged at the front end of the housing, and the lead screw driving structure further comprises

[0008] an expanding assembly installed in the containing cavity, the expanding assembly comprising a lead screw sleeve sliding in the containing cavity, a conical piston arranged at the front end of the lead screw sleeve, and a steering sleeve;

[0009] wherein the rear end of the conical piston is sleeved with the front end of the lead screw sleeve, the steering sleeve is rotationally arranged in the containing cavity and sleeved on the conical piston, and a steering mechanism is arranged between the steering sleeve and the conical piston.

[0010] a driving member installed in the accommodating cavity, a driven screw rod rotationally arranged in the accommodating cavity and threadedly matched with the screw rod sleeve, the driving member driving the driven screw rod to rotate, in turn driving the conical piston to rotate along the axis of the driven screw rod, and in the movement of the conical piston, the steering sleeve is driven to rotate by the steering mechanism for driving the pipe expanding die to rotate.

[0011] By the above technical scheme, when the screw rod driving structure of the electric tool is normally used, the accommodating cavity of the shell provides installation space for each component, the front end of the conical piston penetrates through the opening of the accommodating cavity, the driving member drives the driven screw rod to rotate, in turn driving the threadedly matched screw rod sleeve to move forward, the screw rod sleeve pushes the sleeved conical piston forward, the conical piston gradually expands the pipe expanding die, the steering mechanism arranged between the conical piston and the steering sleeve makes the conical piston drive the steering sleeve to rotate in the sliding process, the steering sleeve rotates the pipe expanding die to keep the roundness of the inner hole of the pipe after the expansion, the movement of the conical piston is converted into the rotary power of the steering sleeve, effective power transmission is realized, the power for pipe expansion is increased, the compactness and smoothness of the structure are ensured, the problem of weight increase caused by the increase of power in traditional electric expanding tools is avoided, and the whole tool is more portable and efficient in use.

[0012] Preferably, the output end of the driving member is provided with a transmission assembly, which comprises a transmission member one and a transmission member two.

[0013] The transmission member one comprises a driving gear rotationally connected to the accommodating cavity and a main screw rod coaxially arranged in the driving gear, and the main screw rod is arranged on the output shaft of the driving member.

[0014] The transmission member two comprises a driven gear rotationally connected to the accommodating cavity and the driven screw rod coaxially arranged in the driven gear, and the driving gear and the driven gear are meshed with each other.

[0015] By the above technical scheme, when the driving member is driven, the driving member drives the main screw rod of the transmission member one to rotate through the output shaft, so that the main screw rod drives the coaxially arranged driving gear to rotate synchronously, based on the meshing of the driving gear and the driven gear, the driving gear transmits power to the driven gear to make it rotate synchronously, and the driven gear can drive the coaxially arranged driven screw rod to rotate along the axial direction, since the driven screw rod and the screw rod sleeve are threadedly matched, in turn driving the threadedly matched screw rod sleeve to slide during rotation, realizing stable movement of the screw rod sleeve and accurate control and transmission of power.

[0016] Preferably, the meshing end faces of the driving gear and the driven gear are obliquely arranged, and the rotation axis of the driving gear is perpendicular to the rotation axis of the driven gear.

[0017] According to the technical scheme, the lower part of the shell needs to be held for use, the driven gear and the driving gear are both bevel gears, the two gears can be engaged and power is transmitted on non-parallel axes according to the structural characteristics of the bevel gears, the two rotating axes are perpendicular to each other, the engagement position is correspondingly inclined at this time, the shape of the shell is adapted, and the transmission efficiency is improved.

[0018] Preferably, the steering mechanism is formed by cooperation of a guide part and a guide groove part, the guide groove part is arranged on the steering sleeve, and the outer wall of the conical piston is fixed with the guide part embedded in the guide groove part to realize sliding guidance.

[0019] The guide part is provided with a mounting hole, a pin shaft is mounted in the mounting hole, the shell is provided with a directional groove, and the pin shaft is located in the directional groove, so that the pin shaft slides along the directional groove to limit the rotation of the conical piston.

[0020] According to the technical scheme, the conical piston is fixed with the guide part, the lower part of the pin shaft is fixed in the mounting hole of the guide part, the upper part of the pin shaft is arranged in the directional groove, the pin shaft moves forward and backward along the guide groove part, thereby indirectly limiting the left-right swing or rotation of the conical piston, the guide part is embedded in the guide groove part of the steering sleeve, the shape and direction of the directional groove are predetermined, the guide part is guided to move along the groove of the directional groove to a limited moving path, based on the fact that the conical piston can slide but cannot rotate and the steering sleeve can rotate but cannot slide, the guide groove part is adapted to the guide part, so that the guide part drives the steering sleeve to rotate, the relative movement between the conical piston and the steering sleeve is realized, and the running efficiency of the screw rod driving structure is further improved.

[0021] Preferably, the guide groove part comprises a starting section, an inclined section and a guide section, the two ends of the inclined section are respectively connected to the guide section and the starting section in a one-to-one correspondence, and the groove direction of the guide section is arranged corresponding to the sliding direction of the conical piston.

[0022] When the guide part is located in the inclined section, the guide part drives the steering sleeve to rotate, and when the guide part is located in the guide section, the guide part provides a moving space for the guide section to realize the sliding of the conical piston relative to the steering sleeve.

[0023] According to the technical scheme, the guide groove part is designed as three different groove section parts connected in sequence, in the initial state, the guide part is located in the starting section, when the guide part moves from the starting section to the inclined section, the guide part abuts against the inner wall of the inclined section to drive the steering sleeve to rotate, the rotation amplitude of the steering sleeve depends on the inclination angle and length of the inclined section, when the guide part moves from the inclined section to the guide section, the steering sleeve stops rotating, the conical piston can continue to push forward, the influence on the sliding of the conical piston is reduced, the related running process between components is optimized, and the stability of smooth running of the structure is further improved.

[0024] Preferably, the steering mechanism is provided with at least two groups, and several steering mechanisms cooperate with each other.

[0025] Through the above technical scheme, the steering mechanism is provided with at least two groups, and the two groups of steering mechanisms work cooperatively to provide more stable and efficient power transmission and steering control.

[0026] Preferably, the tapered piston comprises a tapered portion provided at the front end, a top support portion, and a mounting portion provided at the rear end, the tapered portion is tapered towards the top support portion, and is used for guiding the pipe expanding die to be expanded;

[0027] The mounting portion is provided with the guide portion, and the front end of the screw rod sleeve has an embedded portion fixedly embedded with the mounting portion;

[0028] A space is reserved between the steering sleeve and the top support portion for the mounting portion to pass through.

[0029] Through the above technical scheme, the screw rod sleeve is tightly embedded with the mounting portion through the embedded portion, so as to realize the sliding of the screw rod sleeve to drive the tapered piston. During the forward sliding of the tapered piston, a space is reserved between the steering sleeve and the top support portion. The mounting portion needs to pass through this area during the movement of the tapered piston. Therefore, sufficient space is ensured to avoid interference and ensure smooth movement of the tapered piston.

[0030] The tapered portion of the tapered piston can gradually contact and apply pressure to the pipe expanding die along the sliding direction, so as to force the pipe expanding die to expand outward, so as to realize the close fit and expansion of the top support portion to the inner wall of the pipe, and realize the purpose of stably expanding the pipe end.

[0031] Preferably, the housing is provided with a steering piece, the steering piece is provided at the front end of the steering sleeve, the steering sleeve drives the steering piece to rotate, and the end face of the steering piece away from the steering sleeve is provided with a clamping block for mounting the pipe expanding die.

[0032] Through the above technical scheme, the steering piece is fixedly installed at the front end of the steering sleeve, and the clamping block is fixed thereon as a mounting basis of the pipe expanding die, so as to ensure that the pipe expanding die is clamped on the steering piece and fixed. The steering sleeve drives the steering piece to rotate, and then the steering piece drives the pipe expanding die to rotate, so as to realize uniform expansion of the pipe.

[0033] Preferably, the driving gear and the driven gear are respectively sleeved with bearing one and bearing two outside, and the outer peripheral walls of the bearing one and the bearing two abut against the inner wall of the accommodating cavity.

[0034] The housing is provided with a fixing groove, the fixing groove is provided on the inner wall of the accommodating cavity, the driven screw rod is provided with a bearing three, the bearing three is sleeved on the end portion of the driven screw rod away from the tapered piston, and the outer peripheral wall of the bearing three abuts against the inner wall of the fixing groove.

[0035] The driven screw rod is further provided with a plane bearing abutting between the driven screw rod and the fixed groove bottom;

[0036] The steering sleeve is provided with a one-way bearing arranged between the outer side of the steering sleeve and the steering part, for limiting the reverse rotation of the steering part.

[0037] According to the technical scheme, bearing one is arranged outside the driving gear, bearing two is correspondingly arranged outside the driven gear, the friction resistance of the rotation of the two gears is reduced through the transmission of the bearings, bearing three is arranged at the end of the driven screw rod, the plane bearing is abutted between the driven screw rod and the fixed groove bottom, the friction resistance of the rotation of the driven screw rod is further reduced, the accurate axial position is maintained, and the driving gear, the driven gear and the driven screw rod can rotate more stably.

[0038] The one-way bearing is arranged on the steering sleeve and located between the steering sleeve and the guide part, the inner side of the one-way bearing can guide the rotation of the steering sleeve, and the guide part is limited to rotate in a single direction, when the conical piston retreats, the steering sleeve reversely rotates, the one-way bearing limits the reverse rotation of the guide part, the clamping jaw operates in a single direction, and the expansion stability is improved.

[0039] Preferably, the shell comprises part one and part two, the part one and the part two are connected, so that the expansion assembly is installed into the containing cavity through the connection between the part one and the part two.

[0040] According to the technical scheme, when the part one and the part two are not fixed, the containing cavities in the part one and the part two are both open, the expansion assembly and each accessory are assembled into the containing cavities through the openings, after assembly, the openings of the part one and the part two are connected and fixed, and the convenience of the installation of the internal structure is improved.

[0041] The technical scheme has the following prominent and beneficial technical effects compared with the prior art:

[0042] 1、The technical scheme is characterized in that the containing cavity is arranged in the shell, the driving part drives the rotation of the driven screw rod, the screw rod sleeve cooperated with the substitute screw thread moves forward, the screw rod sleeve pushes the conical piston to move, the conical piston simultaneously pushes the steering sleeve to rotate through the steering mechanism, the front end of the screw rod sleeve is used for mounting the pipe expanding die, the conical piston gradually expands the pipe of the pipe expanding die, the pipe expanding die rotates, the pipe wall is uniformly pressed when the pipe is expanded, effective power transmission is realized, the power of the pipe expansion is increased, the compactness and smoothness of the structure are ensured, and the whole tool is more portable and efficient in use.

[0043] 2、The technical scheme is formed by the cooperation of the guide part and the guide groove part through the steering mechanism, the tapered piston is fixed with the guide part, the guide part slides along the groove of the guide groove part, so that the steering sleeve is pushed to rotate when passing through the inclined section, the pin shaft of the guide part moves forward and backward along the guide groove part, the rotation of the tapered piston is limited, the relative movement between the tapered piston and the steering sleeve is realized, and the operation efficiency of the screw driving structure is further improved. BRIEF DESCRIPTION OF DRAWINGS

[0044] Figure 1 It is a schematic diagram of the overall structure of the embodiment;

[0045] Figure 2 It is an exploded schematic diagram of the shell of the embodiment;

[0046] Figure 3 It is a schematic diagram of the local structure of the embodiment;

[0047] Figure 4 It is a local exploded schematic diagram of the embodiment;

[0048] Figure 5 It is a local sectional view schematic diagram of the embodiment;

[0049] Figure 6 It is a local enlarged schematic diagram of the embodiment; Figure 5 Another local enlarged schematic diagram of the embodiment;

[0050] Figure 7 Another local enlarged schematic diagram of the embodiment; Figure 5 Another local enlarged schematic diagram of the embodiment.

[0051] Reference signs: 1, shell; 11, part one; 12, part two; 2, containing cavity; 3, opening; 4, expansion assembly; 41, screw sleeve; 42, tapered piston; 421, tapered part; 422, jacking part; 423, mounting part; 43, steering sleeve; 6, steering mechanism; 61, guide part; 62, guide groove part; 621, starting section; 622, inclined section; 623, guide section; 7, driving piece; 8, transmission piece one; 81, driving gear; 82, main screw; 9, transmission piece two; 91, driven gear; 92, driven screw; 10, mounting hole; 13, pin shaft; 14, directional groove; 16, embedded part; 17, accommodation space; 18, steering piece; 19, clamping block; 20, bearing one; 21, bearing two; 22, fixed groove; 23, bearing three; 24, plain bearing; 25, one-way bearing. DETAILED DESCRIPTION

[0052] The specific embodiments of the technical scheme will be further described in detail below with reference to the drawings.

[0053] Embodiment:

[0054] Reference Figure 1 and Figure 2The utility model provides an electric tool's screw rod drive structure, including the casing 1, be equipped with containing cavity 2 in the casing 1, the casing 1 includes component one 11 and component two 12 two parts, component one 11 is fixedly connected with component two 12, the front end of casing 1 corresponds the through -going end of containing cavity 2 and is provided with opening 3, containing cavity 2 installs expansion assembly 4, it can be installed to containing cavity 2 through the connecting place between component one 11 and component two 12, expansion assembly 4 includes screw rod sleeve 41, conical piston 42 and steering sleeve 43, one end of conical piston 42 can extend to the outside of casing 1 through opening 3.

[0055] Referring to Figure 3 Containing cavity 2 also installs transmission assembly, it includes transmission piece one 8 and transmission piece two 9, wherein, transmission piece one 8 includes driving gear 81 and main lead screw 82, driving gear 81 is preferably a bevel gear, the bevel face has a threaded structure, and is rotatably connected relative to the containing cavity 2; the main lead screw 82 is coaxially fixed with the driving gear 81, so that the driving gear 81 is driven to rotate synchronously; transmission gear two includes driven gear 91 and driven lead screw 92, driven gear 91 is preferably a bevel gear, the bevel face has a threaded structure, and is rotatably connected relative to the containing cavity 2, the driven gear 91 is engaged with the driving gear 81, the engagement surface is obliquely arranged, and the rotation axis is perpendicular to the rotation axis of the driving gear 81; the driven lead screw 92 is coaxially fixed with the driven gear 91, so as to rotate synchronously with the driven gear 91.

[0056] The driving gear 81 and the driven gear 91 are respectively provided with bearing one 20 and bearing two 21, the inner side of bearing one 20 is sleeved on the driving gear 81, and the outer side is attached to the inner wall of the containing cavity 2 to guide the rotation of the driving gear 81, the inner side of bearing two 21 is sleeved on the driven gear 91, and the outer side is attached to the inner wall of the containing cavity 2 to guide the rotation of the driven gear 91.

[0057] Referring to Figure 4 And Figure 5, the inner side wall of the screw sleeve 41 can be threadedly engaged with the driven screw rod 92, and the screw sleeve 41 can slide forward or backward along the accommodation cavity 2 according to different thread directions; the conical piston 42 sequentially includes a tapered portion 421, a supporting portion 422, and a mounting portion 423 in the length direction, the tapered portion 421 is arranged in a tapered manner away from the supporting portion 422, and the tapered portion 421 has a conical shape, the supporting portion 422 is connected between the tapered portion 421 and the mounting portion 423, and the cross-sectional area of the supporting portion 422 is the same as the maximum cross-sectional area of the tapered portion 421 and is connected, the driven screw rod 92 is arranged inside the conical piston 42, and in this embodiment, the end face of the driven screw rod 92 abuts against the inner step protrusion of the supporting section; the mounting portion 423 is arranged in a protruding manner relative to the supporting portion 422, the conical piston 42 is arranged inside or outside the screw sleeve 41, and in this embodiment, the conical piston 42 is arranged outside the screw sleeve 41, and the specific arrangement manner is that the front end of the screw sleeve 41 has an embedding portion 16 which can be embedded with the mounting portion 423.

[0058] The turning sleeve 43 is arranged on the conical piston 42 and corresponds to the position of the supporting section, the turning sleeve 43 is arranged to rotate in the accommodation cavity 2, the rotation direction of the turning sleeve 43 is coaxial with the sliding direction of the piston sleeve, there is a space 17 between the inner side of the turning sleeve 43 and the outer side wall of the supporting section of the conical piston 42, the space 17 is matched with the mounting portion 423, and the space 17 is used to accommodate the mounting portion 423 when the conical piston 42 slides.

[0059] The turning mechanism 6 is arranged between the turning sleeve 43 and the conical piston 42, and there are at least two groups of the turning mechanism 6, a plurality of turning mechanisms 6 are matched with each other, in this embodiment, the turning mechanism 6 is arranged in two groups, and the two groups of turning mechanisms 6 are symmetrically arranged on the upper and lower sides relative to the housing 1, the turning mechanism is formed by cooperation of a guide portion 61 and a guide groove portion 62, the guide groove portion 62 is arranged on the outer wall of the housing 1 and includes three groove sections, i.e., a starting section 621, an inclined section 622, and a guide section 623, the two ends of the inclined section 622 are respectively connected between the guide section 623 and the starting section 621, the groove direction of the inclined section 622 is arranged to be inclined relative to the guide section 623, and the groove direction of the guide section 623 is arranged to correspond to the sliding direction of the conical piston 42; the guide portion 61 protrudes from the outer side wall of the mounting portion 423, the shape of the guide portion 61 is matched with and embedded in the guide groove portion 62, the guide portion 61 penetrates through a mounting hole 10, and the mounting hole 10 is fixed with an adaptive pin shaft 13; as shown in Figure 6 the housing 1 is provided with a directional groove 14, the groove direction of the directional groove 14 is parallel to the sliding direction of the conical piston 42, one end of the pin shaft 13 is inserted into the mounting hole 10, the upper end of the pin shaft 13 is located in the directional groove 14, and the pin shaft 13 slides along the groove direction of the directional groove 14 to limit the rotation of the conical piston 42.

[0060] Referring to Figure 6 and Figure 7The housing 1 is further provided with a turning piece 18 sleeved on the conical piston 42, the turning piece 18 abuts against the turning sleeve 43, so that the turning of the turning sleeve 43 can drive the turning piece 18 to synchronously turn, the end face of the turning piece 18 away from the turning sleeve 43 is provided with a clamping block 19 for installing the pipe expanding die; a gap is left between the inner wall of the turning piece 18 and the outer wall of the front end of the turning sleeve 43, a one-way bearing 25 is installed in the gap, the inner side of the one-way bearing 25 is sleeved on the turning sleeve 43, and the outer side of the one-way bearing 25 abuts against the inner wall of the turning piece 18, so as to limit the turning piece 18 from being reversed, and realize that the turning piece 18 always turns in one direction when the turning sleeve 43 repeatedly turns.

[0061] The housing 1 is provided with a fixing groove 22 arranged on the inner wall of the accommodating cavity 2 and corresponding to the rear end of the driven screw rod 92, the fixing groove 22 is internally provided with a bearing three 23 and a plane bearing 24, the inner side of the bearing three 23 is sleeved on the end of the driven screw rod 92 away from the conical piston 42, and the outer side wall of the bearing three 23 abuts against the inner side wall of the fixing groove 22, the plane bearing 24 abuts between the driven screw rod 92 and the groove bottom of the fixing groove 22, and the one side of the plane bearing 24 abuts against the end face of the end of the driven screw rod 92, so as to guide the turning of the bearing three 23.

[0062] The accommodating cavity 2 is internally provided with a driving piece 7, which is preferably a driving motor, the main screw rod 82 is arranged on the output end of the driving piece 7, the driving piece 7 drives the main screw rod 82 to turn, the main screw rod 82 drives the main gear 81 to turn, the main gear 81 drives the driven gear 91 engaged therewith to turn, and the driven gear 91 drives the driven screw rod 92 to turn, based on the threaded cooperation between the driven screw rod 92 and the screw rod sleeve 41, when the driven screw rod 92 turns in the first direction, the screw rod sleeve 41 moves forward, which pushes the conical piston 42 at the front end to synchronously move, in the initial state, the guide portion 61 of the conical piston 42 is located in the guide section 623, the conical piston 42 slides forward to drive the guide portion 61 to enter the inclined section 622 and abut against the side wall of the inclined section 622, so that the turning sleeve 43 turns, until the guide portion 61 slides to the end point in the guide section 623, the turning of the turning sleeve 43 can drive the turning piece 18 to synchronously turn, so as to realize that the conical piston 42 expands the pipe expanding die while the turning piece 18 drives the clamping jaw to turn, when the driven screw rod 92 turns in the second direction, the conical piston 42 and the screw rod sleeve 41 move backward to reset, and the turning sleeve 43 reversely turns, and the turning piece 18 does not turn.

[0063] The specific working process of the scheme is as follows:

[0064] The technical scheme is characterized in that the shell 1 is provided with a containing cavity 2, the containing cavity 2 is provided with an expansion assembly 4, the expansion assembly 4 comprises a conical piston 42 penetrating the opening 3 of the containing cavity 2, a driving member 7 drives a lead screw sleeve 41 to slide forward through a transmission assembly, the sliding of the lead screw sleeve 41 drives the conical piston 42 to move forward, a steering mechanism 6 is arranged between the conical piston 42 and a steering sleeve 43, so that the conical piston 42 can drive the steering sleeve 43 to rotate when the conical piston 42 slides, an expansion die is mounted at the front end of the lead screw sleeve 41, the conical piston 42 gradually expands the expansion die to expand the pipeline, the lead screw sleeve 41 drives a steering member 18 to rotate, the steering member 18 rotates the expansion die to expand the inner hole of the pipe and keep the roundness, the expansion die uniformly applies pressure to the inner wall of the pipe, the movement of the conical piston 42 is converted into the rotary power of the steering sleeve 43, effective power transmission is realized, the power for expansion is increased, the compactness and smoothness of the structure are ensured, the problem of weight increase caused by the increase of power in traditional electric expansion tools is avoided, and the whole tool is more portable and efficient when used.

[0065] The basic principle and main features of the technical scheme and the advantages of the technical scheme are shown and described above. It should be understood by those skilled in the art that the technical scheme is not limited to the above-mentioned embodiments, the above-mentioned embodiments and the description in the specification are only to illustrate the principle of the technical scheme, and various changes and improvements can be made to the technical scheme without departing from the spirit and scope of the technical scheme, and these changes and improvements all fall within the scope of the claimed technical scheme. The scope of protection of the technical scheme is defined by the appended claims and their equivalents.

Claims

1. A lead screw drive structure for an electric tool, comprising a housing (1), wherein the housing (1) has a receiving cavity (2), and the front end of the housing (1) has an opening (3), characterized in that: Also includes An extension assembly (4) is installed in the receiving cavity (2). The extension assembly (4) includes a lead screw sleeve (41) that slides in the receiving cavity (2), a conical piston (42) disposed at the front end of the lead screw sleeve (41), and a steering sleeve (43). Wherein, the rear end of the conical piston (42) is fitted with the front end of the lead screw sleeve (41), the steering sleeve (43) is rotatably disposed in the receiving cavity (2) and fitted on the conical piston (42), and a steering mechanism (6) is provided between the steering sleeve (43) and the conical piston (42); A drive member (7) is installed in the receiving cavity (2). A driven screw (92) is rotatably arranged in the receiving cavity (2), which is threadedly engaged with the screw sleeve (41). The drive member (7) drives the driven screw (92) to rotate, thereby driving the conical piston (42) to rotate along the axis of the driven screw (92). During the movement of the conical piston (42), the steering sleeve (43) is driven to rotate through the steering mechanism (6) to drive the expansion mold to rotate.

2. The lead screw drive structure for an electric tool according to claim 1, characterized in that: The output end of the drive unit (7) is provided with a transmission assembly, which includes a first transmission component (8) and a second transmission component (9); The transmission component (8) includes a drive gear (81) rotatably connected to the receiving cavity (2) and a main lead screw (82) coaxially disposed on the drive gear (81). The main lead screw (82) is disposed on the output shaft of the drive component (7). The transmission component 2 (9) includes a driven gear (91) rotatably connected to the receiving cavity (2) and a driven lead screw (92) coaxially disposed on the driven gear (91), wherein the driving gear (81) meshes with the driven gear (91).

3. The lead screw drive structure for an electric tool according to claim 2, characterized in that: The meshing end faces of the driving gear (81) and the driven gear (91) are inclined, and the rotation axis of the driving gear (81) is perpendicular to the rotation axis of the driven gear (91).

4. The lead screw drive structure for an electric tool according to claim 1, characterized in that: The steering mechanism (6) is formed by the cooperation of the guide part (61) and the guide groove part (62). The steering sleeve (43) is provided with the guide groove part (62). The outer wall of the conical piston (42) is fixed with the guide part (61) embedded in the guide groove part (62) to realize the sliding guidance. The guide part (61) has a mounting hole (10), in which a pin (13) is installed. The housing (1) has a directional groove (14), in which the pin (13) is located, so that the pin (13) slides along the directional groove (14) to limit the rotation of the conical piston (42).

5. The lead screw drive structure for an electric tool according to claim 4, characterized in that: The guide groove (62) includes a starting section (621), an inclined section (622) and a guide section (623). The two ends of the inclined section (622) are respectively connected to the guide section (623) and the starting section (621). The groove of the guide section (623) is arranged in the sliding direction of the corresponding conical piston (42). When the guide portion (61) is in the inclined section (622), the guide portion (61) pushes the steering sleeve (43) to rotate. When the guide portion (61) is in the guide section (623), the guide portion (61) provides movement clearance for the guide section (623) to achieve sliding of the conical piston (42) relative to the steering sleeve (43).

6. The lead screw drive structure for an electric tool according to claim 3, characterized in that: The steering mechanism (6) is provided in at least two sets, and several steering mechanisms (6) cooperate with each other.

7. The lead screw drive structure for an electric tool according to claim 4, characterized in that: The conical piston (42) includes a tapered portion (421) and a top support portion (422) disposed at the front end and a mounting portion (423) disposed at the rear end. The tapered portion (421) is tapered away from the top support portion (422) and is used to guide the expansion mold to open. The mounting part (423) is provided with the guide part (61), and the front end of the lead screw sleeve (41) has an insert part (16) that fits and is fixed to the mounting part (423); A clearance space (17) is provided between the steering sleeve (43) and the top support (422) to accommodate the passage of the mounting part (423).

8. The lead screw drive structure for an electric tool according to claim 1, characterized in that: The housing (1) is provided with a steering component (18), which is located at the front end of the steering sleeve (43). The steering sleeve (43) drives the steering component (18) to rotate. The end face of the steering component (18) facing away from the steering sleeve (43) has a locking block (19) for installation of the expansion mold.

9. The lead screw drive structure for an electric tool according to claim 2, characterized in that: The driving gear (81) and the driven gear (91) are respectively fitted with bearing one (20) and bearing two (21), and the outer peripheral walls of bearing one (20) and bearing two (21) abut against the inner wall of the receiving cavity (2); The housing (1) is provided with a fixing groove (22), the fixing groove (22) is provided on the inner wall of the receiving cavity (2), the driven screw (92) is provided with a bearing three (23), the bearing three (23) is sleeved on the end of the driven screw (92) away from the conical piston (42), and the outer peripheral wall of the bearing three (23) abuts against the inner wall of the fixing groove (22); The driven lead screw (92) is also provided with a plane bearing (24), which abuts against the driven lead screw (92) and the bottom of the fixed groove (22); The steering sleeve (43) is fitted with a one-way bearing (25), which is located between the outside of the steering sleeve (43) and the steering component (18) to restrict the steering component (18) from reversing.

10. The lead screw drive structure for an electric tool according to claim 1, characterized in that: The housing (1) includes a first component (11) and a second component (12), the first component (11) and the second component (12) being connected such that the extension assembly (4) is installed into the receiving cavity (2) through the connection between the first component (11) and the second component (12).

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