Electric pipe expanding tightening tool

Abstract

The invention belongs to the technical field of pipe expanding tools, and particularly relates to an electric pipe expanding tightening tool which comprises a shell provided with an installation cavity and further comprises a driving assembly installed in the installation cavity, the driving assembly comprises a driving motor, a lead screw sleeve and a piston lead screw, and the piston lead screw is arranged in the installation cavity in a sliding mode. The screw rod sleeve is rotationally arranged in the mounting cavity and is in threaded fit with the piston screw rod; the pipe expanding mechanism comprises a conical piston and a pipe expanding die, the conical piston is fixedly arranged at the end of the piston lead screw, and the pipe expanding die is arranged on the front side of the conical piston. The tightening mechanism comprises a sliding tight sleeve, a fixed mold arranged on the sliding tight sleeve and a sliding tight mold, the fixed mold fixedly sleeves the sliding tight sleeve, the sliding tight mold slidably sleeves the sliding tight sleeve and is connected with the piston screw rod, and the sliding tight sleeve is rotationally arranged on the shell through a steering adjusting mechanism; the driving motor drives the lead screw sleeve to rotate, so that the piston lead screw pushes the conical piston to eject out or the sliding mold to move in the two directions.

Description

Technical Field

[0001] The present technical solution relates to the technical field of pipe expanding tools, specifically an electric pipe expanding and tightening tool. Background Art

[0002] A pipe expanding tool is used to expand the end of a pipe with a certain diameter to form a flared mouth, a cup-shaped mouth or other required shapes to achieve the purpose of expanding the pipe. The expanded end can be connected to a pipe joint. A tightening tool is used to fasten or compress the pipe connection part, and tighten a sliding sleeve on the expanded end of the pipe to press it against the joint.

[0003] For example, in Chinese Patent CN106180432A, a pipe expanding and tightening tool is disclosed, which includes a guiding pipe. An oil cylinder is arranged inside the pipe body of the guiding pipe, and a piston rod is arranged inside the oil cylinder. The front end of the piston rod is connected with a pipe expander, and the rear end of the pipe expander is located inside the pipe body of the guiding pipe. A fixed chuck and a movable chuck are arranged outside the pipe body of the guiding pipe. The fixed chuck is fixedly arranged at the front end of the guiding pipe. A limiting strip-shaped hole a is axially formed on the pipe body of the guiding pipe, and a movable cylindrical pin a is arranged inside the limiting strip-shaped hole a. The movable chuck is fixedly connected with the piston rod inside the pipe body through the movable cylindrical pin a.

[0004] In the existing installation environment, the space on both sides of the pipe fittings close to the wall is usually insufficient, resulting in easy interference between the pipe expanding tool and the tightening tool, affecting normal operation. When expanding the pipe fittings that have been fixed, it is extremely easy for the pipe expanding tool and the tightening tool to interfere with each other. After the pipe joint is inserted into the expanded end of the pipe fitting, the matching direction of the pipe fitting sliding sleeve and the pipe joint is fixed, making it difficult for the tightening tool to find a suitable operation angle and space, not easy to observe, and inconvenient to use, thus needing improvement. Summary of the Invention

[0005] In order to improve the problem that the operation and use of the pipe expanding and tightening tool are inconvenient due to environmental constraints after the pipe fittings are fixedly installed, the present technical solution provides an electric pipe expanding and tightening tool.

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

[0007] An electric pipe expanding and tightening tool, including a housing, the housing having an installation cavity, further including:

[0008] A driving assembly, which is installed in the installation cavity. The driving assembly includes a driving motor, a lead screw sleeve and a piston lead screw. The piston lead screw is slidably arranged in the installation cavity, and the lead screw sleeve is rotatably arranged in the installation cavity and is in threaded cooperation with the piston lead screw;

[0009] A pipe expanding mechanism, which includes a conical piston and a pipe expanding die. The conical piston is fixedly arranged at the end of the piston lead screw, and the pipe expanding die is arranged on the front side of the conical piston;

[0010] A tightening mechanism, which includes a sliding tightening sleeve, a fixed die arranged on the sliding tightening sleeve, and a sliding tightening die. The fixed die is fixedly sleeved on the sliding tightening sleeve. The sliding tightening die is slidably sleeved on the sliding tightening sleeve and is connected to the piston screw rod. The sliding tightening sleeve is rotatably arranged on the housing through a steering adjustment mechanism;

[0011] The driving motor drives the screw sleeve to rotate. When the screw sleeve drives the piston screw rod to slide in the first direction, the piston screw rod pushes the conical piston out, so that the conical piston expands the pipe expanding die to expand the pipe. When the piston screw rod slides in the opposite second direction, the piston screw rod drives the sliding tightening die to move. The sliding tightening die approaches the fixed die, and the sliding tightening die is used to push the sliding sleeve to be sleeved on the pipe fitting outside the pipe joint.

[0012] Through the above technical solution, the driving motor installed on the housing drives the rotatably arranged screw sleeve to rotate. The piston screw rod in threaded cooperation with the screw sleeve performs a sliding movement under the drive of the screw sleeve. Its sliding direction reciprocates between the first direction and the second direction arranged oppositely. When the piston screw rod slides in the first direction (forward), the conical piston fixed at the end of the piston screw rod is pushed forward, and the conical piston expands the pipe expanding die in front of it, realizing the pipe expanding action of the pipe fitting. Insert the pipe joint into the expanded pipe section of the pipe fitting, place the pipe joint on the fixed die, place the sliding sleeve sleeved on the pipe fitting on the sliding tightening die, and then reverse the driving motor. Drive the screw sleeve to drive the piston screw rod to slide in the opposite second direction (backward). The piston screw rod drives the sliding tightening die to move backward through the transmission part, so that it is pulled closer to the fixed die. The sliding tightening die pushes the sliding sleeve to be sleeved on the expanded pipe part of the pipe fitting outside the pipe joint. The pipe expanding and tightening actions are independently driven by the forward and reverse sliding of the piston screw rod respectively. The sliding tightening sleeve changes the position and orientation of the fixed die and the sliding tightening die through the rotatable design of the steering adjustment mechanism, optimizes the operation convenience in a narrow space (especially when the pipe fitting is installed against the wall), effectively avoids the interference between tools, and solves the problems of observation and operation difficulties caused by the fixed cooperation direction between the sliding sleeve and the pipe joint, improving the convenience.

[0013] Preferably, the steering adjustment mechanism includes a limiting sleeve, a locking part, and an elastic part. The outer side of the limiting sleeve is connected to the housing. The inner side of the limiting sleeve is sleeved on the sliding tightening sleeve and abuts against it for limiting, so as to prevent the sliding tightening sleeve from disengaging;

[0014] The sliding tightening sleeve is provided with a plurality of installation grooves, and the elastic parts are installed in the installation grooves. The two ends of the elastic part respectively abut against the locking part and the bottom of the installation groove. The limiting sleeve is correspondingly provided with a fixed gear groove;

[0015] When the tightening sleeve rotates relative to the limiting sleeve, the locking member is fitted into the defined groove, and the elastic force of the elastic member causes the locking member to tend to press against the bottom of the installation groove, so as to position the rotation of the tightening sleeve.

[0016] Through the above technical solution, the outer side of the limiting sleeve provided on the housing is connected to the housing, and the inner side is sleeved on the tightening sleeve and abuts against it for limit, effectively preventing the tightening sleeve from axially disengaging; a steering adjustment mechanism is installed in each of the several installation grooves opened in the tightening sleeve. This mechanism is composed of a locking member and an elastic member. The two ends of the elastic member respectively abut against the locking member and the bottom of the installation groove. When the tightening sleeve rotates, the locking member is engaged with the defined groove, and at the same time, the elastic force of the elastic member continuously acts on the locking member, making it tend to press against the bottom of the installation groove, so as to achieve precise positioning during the rotation of the tightening sleeve, and thus achieve multi-stage adjustment.

[0017] Preferably, one end of the piston screw rod is connected to the conical piston, and the other end is connected to the tightening die.

[0018] Through the above technical solution, the piston screw rod directly and independently drives the two core actions of pipe expansion and tightening along a single reciprocating linear motion, improving the stability and reliability of the tool operation.

[0019] Preferably, one end of the piston screw rod in the sliding direction passes through the tightening sleeve and is connected to the tightening die, and the end is connected to the conical piston.

[0020] Through the above technical solution, by directly connecting the tightening die to the end of the piston screw rod passing through the tightening sleeve, and at the same time fixing the conical piston at the end of the screw rod, both the pipe expansion and tightening actions are arranged on the same side of the piston screw rod, without the need to turn the housing for use, improving convenience.

[0021] Preferably, the fixing die includes a fixing base and a fixing clamp. At least one fixing clamp is provided on the fixing base. The fixing base is fixedly sleeved on the outer side of the tightening sleeve, and the fixing base is provided with a first limiting groove;

[0022] The tightening die includes a sliding base and a tightening clamp. At least one tightening clamp is provided on the sliding base. The sliding base is slidably sleeved on the outer side of the tightening sleeve. The tightening clamp is correspondingly provided with a second limiting groove, and the second limiting groove is arranged in alignment with the first limiting groove. The tightening clamp and the tightening clamp are respectively used to abut against the pipe joint and the sliding sleeve.

[0023] Through the above technical solution, the fixed base is fixedly sleeved outside the sliding sleeve, and the first limiting groove on it abuts the pipe joint through the fixed clamp. The sliding base is slidably sleeved outside the sliding sleeve, and the second limiting groove of its sliding clamp is arranged in alignment with the first limiting groove. The second limiting groove carried by the sliding clamp approaches the first limiting groove of the fixed clamp. During this process, the sliding clamp pushes the sliding sleeve sleeved on the pipe fitting towards the pipe joint. The second limiting groove and the first limiting groove cooperate to precisely abut and limit the pipe joint and the sliding sleeve, realizing stable clamping and axial positioning during the assembly of the pipe fitting, optimizing the uniformity of the tightening force distribution, and improving the assembly stability.

[0024] Preferably, at least one installation groove is provided on the side walls of both the fixed base and the sliding base, and the installation grooves are respectively used for clamping and fixing the corresponding fixed clamp and sliding clamp.

[0025] Through the above technical solution, the fixed base and the sliding base are installed by being embedded in the lower part of the installation groove and are fixedly connected by bolts, realizing rapid positioning and installation, ensuring the alignment of the positions of the limiting grooves between the two, and further improving the stability of the axial force.

[0026] Preferably, a plurality of installation grooves are provided, and the plurality of installation grooves are axially distributed on the corresponding fixed base and sliding base. The fixed base and the sliding base are installed corresponding to different installation grooves to adjust the clamping distance between the fixed clamp and the sliding clamp.

[0027] Through the above technical solution, the fixed clamp and the sliding clamp can be installed in the installation grooves at different positions on the corresponding base. By adjusting the axial installation position of the clamp, the initial clamping distance is changed, which is applicable to the assembly of pipe fittings of different specifications, improving the compatibility of the tool with sliding sleeves of different pipe diameters and the assembly efficiency.

[0028] Preferably, buffer pads are installed in both the first limiting groove and the second limiting groove.

[0029] Through the above technical solution, by installing buffer pads in the first limiting groove and the second limiting groove, the buffer pads absorb the impact energy through their own deformation, evenly disperse the local stress during the assembly of the pipe fitting, reduce the assembly vibration and noise; avoid surface scratches caused by the hard contact between the metal clamp and the pipe fitting, and the buffer pads can be replaced separately, reducing the wear of the fixed clamp and the sliding clamp during long-term use and extending the service life.

[0030] Preferably, a synchronous component is provided between the sliding die and the piston screw rod. The synchronous component includes a sliding block arranged at the end of the piston screw rod and a transmission part. The sliding block is slidably arranged in the sliding sleeve. The sliding block is provided with a positioning ring groove, and the sliding base is correspondingly provided with positioning holes along the opposite side walls;

[0031] The sliding tightening sleeve is correspondingly provided with limiting grooves along opposite side walls, the length direction of the limiting grooves is arranged corresponding to the sliding direction of the sliding block, the transmission member passes through the positioning hole and the rear end of the sliding groove and is embedded in the positioning ring groove, so as to coaxially fix the sliding block and the sliding base.

[0032] Through the above technical solution, the sliding block is connected to the end of the piston screw rod, the sliding block is adjusted so that the positioning ring groove formed therein communicates with the limiting groove, the sliding base is moved until the position of the positioning hole on the sliding base communicates with the positioning ring groove. At this time, the positioning ring groove, the positioning hole and the sliding groove are aligned and communicated. Subsequently, the end of the transmission member passes through the positioning hole and the limiting groove and is then embedded in the positioning ring groove. The transmission member is threadedly connected to the positioning hole. At this time, the axial cooperation between the sliding base and the sliding block is realized; the transmission member can move along the sliding groove to ensure that the sliding block can move smoothly, and the transmission member can abut against the opposite side walls of the sliding groove to further limit the radial deflection of the sliding block and the piston screw rod. The groove direction of the limiting groove extends to guide the movement of the transmission member, ensuring that the sliding base pushes the sliding tightening fixture along a straight track, improving stability and ensuring assembly reliability.

[0033] Preferably, a transmission assembly is provided between the driving motor and the piston screw rod. The transmission assembly includes:

[0034] A driving shaft, which is rotatably arranged at the output end of the driving motor;

[0035] A driving gear, which is coaxially sleeved on the driving shaft and fixed;

[0036] [[ID=1:5]]A driven gear, which is rotatably arranged in the installation cavity. The driven gear is coaxially sleeved on the screw rod sleeve and fixed, and the driven gear meshes with the driving gear;

[0037] The piston screw rod is sleeved with a plain bearing. The screw rod sleeve and the sliding tightening sleeve respectively abut against opposite sides of the plain bearing. A bearing member is arranged in the housing, and the bearing member is sleeved on the screw rod sleeve for guiding rotation.

[0038] Through the above technical solution, the driving motor drives the driving shaft to rotate. Based on the coaxial fixation of the driving shaft and the driving gear, the driving shaft drives the driving gear to rotate. The driving gear drives the driven gear meshing therewith to rotate, and the driven gear drives the screw rod sleeve to rotate, so as to realize the sliding of the piston screw rod and ensure the operation reliability.

[0039] The end of the screw rod sleeve abuts against the plain bearing to provide radial support and guidance. And the circumferential side wall of the sliding tightening sleeve abuts against the bearing member, and the bearing member guides the rotation of the screw rod sleeve, reducing the frictional resistance during the rotation of the screw rod sleeve and improving the stability of the power transmission efficiency and the rotation guidance.

[0040] The prominent and beneficial technical effects of this technical solution compared with the prior art are:

[0041] 1. This technical solution uses a sliding sleeve to be rotatably connected to the housing by a steering adjustment mechanism. The steering adjustment mechanism includes a limiting sleeve, a locking member, and an elastic member. The elastic member pushes the locking member to abut against the fixed groove of the limiting sleeve. By rotating the sliding sleeve, adaptive adjustment positioning is achieved, changing the position and orientation of the fixed mold and the sliding mold, optimizing operation convenience in narrow spaces, reducing interference between tools, and solving the observation and operation difficulties caused by the fixed matching direction of the sliding sleeve and the pipe joint, thereby improving convenience.

[0042] 2. This technical solution uses the bidirectional sliding of the piston screw to independently drive the tapered piston to push out the expansion action of the tube expansion die, and pull the sliding die through the transmission part to push the sliding sleeve compression tube joint to tighten, thereby avoiding simultaneous expansion and tightening, reducing mutual interference in power transmission, and improving the stability of tool use. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 This is a schematic diagram of the overall structure of Example 1;

[0044] Figure 2 For Example 1 Figure 1 Schematic diagram from another perspective;

[0045] Figure 3 This is a partial explosion diagram of Example 1;

[0046] Figure 4 It is a partial cross-sectional schematic diagram of Example 1;

[0047] Figure 5 For Example 1 Figure 4 One of the partial enlarged schematic diagrams;

[0048] Figure 6 For Example 1 Figure 4 Partial enlarged schematic diagram 2;

[0049] Figure 7 This is a structural state diagram of the tightening operation of Example 1;

[0050] Figure 8 This is a schematic diagram of the overall structure of Example 2;

[0051] Figure 9 It is a partial cross-sectional schematic diagram of Example 2;

[0052] Figure 10 For Example 2 Figure 8 A partially enlarged schematic diagram.

[0053] Reference numerals: 1, housing; 2, installation cavity; 31, drive motor; 32, lead screw sleeve; 33, piston lead screw; 4, pipe expanding mechanism; 41, conical piston; 42, pipe expanding die; 5, tightening mechanism; 51, sliding tightening sleeve; 52, fixed die; 521, fixed base; 522, fixed fixture; 53, sliding tightening die; 531, sliding base; 532, sliding tightening fixture; 6, synchronization component; 61, sliding block; 62, transmission part; 71, first limiting groove; 72, second limiting groove; 81, positioning ring groove; 82, positioning hole; 9, installation groove; 10, buffer pad; 11, transmission component; 111, drive shaft; 112, driving gear; 113, driven gear; 12, plain bearing; 13, bearing part; 15, limiting groove; 16, steering adjustment mechanism; 161, locking part; 162, elastic part; 163, limiting sleeve; 18, installation groove; 19, retaining groove; 100, pipe fitting; 200, pipe joint; 300, sliding sleeve. Detailed implementation mode

[0054] The following further details the specific implementation mode of the technical solution in conjunction with the attached drawings.

[0055] Embodiment 1:

[0056] See Figure 1 and Figure 4 , an electric pipe expanding and tightening tool, including a housing 1, with an installation cavity 2 inside the housing 1, and further including a driving component, which includes a drive motor 31, a lead screw sleeve 32 and a piston lead screw 33. Among them, the drive motor 31 is installed in the handle area at the lower part of the installation cavity 2, the piston lead screw 33 is horizontally arranged at the upper part of the installation cavity 2, and the piston lead screw 33 is movably arranged relative to the installation cavity 2; there is a transmission component 11 between the piston lead screw 33 and the drive motor 31, and this transmission component 11 includes a drive shaft 111, a driving gear 112 and a driven gear 113. The drive shaft 111 is located above the drive motor 31, its lower end is connected to the output end of the drive motor 31, and it is rotatably arranged relative to the installation cavity 2; the driving gear 112 and the driven gear 113 are preferably bevel gears. The bevel gear has a conical structure and the teeth are distributed along the conical surface for transmission between intersecting shafts (such as 90°), which can change the direction and transmit power with relatively high efficiency. The driving gear 112 is sleeved on the end of the drive shaft 111 and is coaxially fixed with the drive shaft 111. The driven gear 113 is sleeved on the piston lead screw 33 and is coaxially fixed with the piston lead screw 33. The tooth part of the driven gear 113 meshes with the tooth part of the driving gear 112, and the meshing surface is arranged in an inclined plane. Both the driving gear 112 and the driven gear 113 are rotatably arranged in the installation cavity 2.

[0057] The lead screw sleeve 32 is sleeved outside the piston lead screw 33 and is in threaded fit with it. The lead screw sleeve 32 is rotatably arranged relative to the installation cavity 2. A plain bearing 12 is provided on the lead screw sleeve 32. One end of the lead screw sleeve 32 abuts against the rotating side of the plain bearing 12, and the other end is embedded in one opening on the side of the driven gear 113. A bearing member 13 is also sleeved outside the lead screw sleeve 32. The outside of the bearing member 13 is clamped and fixed to the inner wall of the installation cavity 2, and its inner side abuts against the outer peripheral wall of the lead screw sleeve 32. The bearing member 13 and the plain bearing 12 cooperate to guide the rotation of the lead screw sleeve 32 and reduce the friction force.

[0058] See Figure 2 and Figure 4 Also included are an expanding pipe mechanism 4 and a tightening mechanism 5. The expanding pipe mechanism 4 and the tightening mechanism 5 are respectively installed on the front and rear sides of the housing 1. The expanding pipe mechanism 4 located at the rear side includes an expanding pipe die 42 and a tapered piston 41. The tapered piston 41 is embedded in the installation cavity 2 and is fixedly connected to the end of the piston lead screw 33 away from the tightening mechanism 5. The tapered surface of the tapered piston 41 faces outward. The expanding pipe die 42 is located on the side of the tapered piston 41 facing away from the piston lead screw 33 and is detachably installed on the housing 1. In this embodiment, it is shown that the expanding pipe die 42 is provided with a tapered cavity near the tapered piston 41 that is adapted to its shape and size. The front end of the tapered piston 41 can be embedded in the tapered cavity on the rear side of the expanding pipe die 42. The end of the pipe fitting 100 is sleeved outside the expanding pipe die 42. By driving the driving shaft 111 to rotate through the driving motor 31, the driving shaft 111 drives the rotation of the driving gear 112. The driving gear 112 drives the engaged driven gear 113 to rotate. The driven gear 113 drives the piston lead screw 33 to move in the first direction. The piston lead screw 33 pushes the tapered piston 41 to move outward. Based on the fact that the expanding pipe die 42 includes a plurality of movable dies that are hingedly arranged, the tapered piston 41 simultaneously pushes open a plurality of movable dies, thereby realizing the expansion of the end of the pipe fitting 100 by the expanding pipe die 42 and completing the pipe expansion operation.

[0059] See Figure 3 , Figure 4 and Figure 6 The tightening mechanism 5 includes a tightening sleeve 51, a fixed die 52, and a tightening die 53. The tightening sleeve 51 is located on the side of the housing 1 facing away from the expanding pipe mechanism 4. The tightening sleeve 51 is rotatably connected to the housing 1. In this embodiment, it is shown that the tightening sleeve 51 has a cavity inside. One end of the cavity communicates with the inside of the installation cavity 2, and the other end communicates with the outside. The end of the piston lead screw 33 away from the tapered piston 41 extends in the direction of the tightening sleeve 51 and is embedded in the cavity.

[0060] The slip tightening sleeve 51 is rotatably connected to the housing 1 through the steering adjustment mechanism 16. The steering adjustment mechanism 16 includes a limiting sleeve 163, a locking member 161, and an elastic member 162. The limiting sleeve 163 is sleeved on the outer side of the slip tightening sleeve 51. In this embodiment, the case where the slip tightening sleeve 51 has a boss portion is shown, and this boss portion is embedded inside the limiting sleeve 163. The limiting sleeve 163 restricts the separation of the slip tightening sleeve 51 from the housing 51, and there is a gap between them to allow the slip tightening sleeve 51 to rotate smoothly; the outer wall of the limiting sleeve 163 is threadedly connected to the inner wall of the housing 1 by threads. The slip tightening sleeve 51 is provided with a plurality of installation grooves 18, and all the plurality of installation grooves 18 are located on the end face of the boss portion of the slip tightening sleeve 51 close to the limiting sleeve 163. The elastic member 162 is preferably a return spring, and the plurality of elastic members 162 are respectively embedded in the plurality of installation grooves 18 one by one. The locking member 161 is preferably a ball. One end of each elastic member 162 abuts against the bottom of the corresponding installation groove 18, and the other end abuts against the locking member 161. The limiting sleeve 163 is provided with a plurality of fixed position grooves 19, and the number of the fixed position grooves 19 is the same as that of the locking members 161. The plurality of fixed position grooves 19 correspond to the plurality of locking members 161 one by one, so that the elastic force of the elastic member 162 can push the locking member 161 to be respectively embedded in the fixed position grooves 19 one by one.

[0061] The fixed mold 52 includes a fixed base 521 and a fixed fixture 522. The fixed base 521 is sleeved on the outer side of the slip tightening sleeve 51 and is fixed to the end of the slip tightening sleeve 51 away from the housing 1. The fixed base 521 is provided with two bolt holes, and the two bolt holes are respectively opened on the opposite side walls of the fixed base 521. The slip tightening sleeve 51 is provided with threaded holes at positions corresponding to the two bolt holes one by one. By passing bolts through the corresponding bolt holes, the screw of the bolt is threadedly connected in the threaded hole, and the bolt head is hidden in the bolt hole, so as to realize the bolt fixation between the fixed base 521 and the slip tightening sleeve 51; the fixed fixture 522 is installed above the fixed base 521, and its installation method is that a plurality of installation grooves 9 are opened on the outer wall of the fixed base 521. In this embodiment, the case where one installation groove 9 is opened is shown. The lower part of the fixed fixture 522 is embedded in this installation groove 9, and the bolt passes through the fixed fixture 522 and is connected to the fixed base 521; the upper part of the fixed fixture 522 is provided with a first limiting groove 71, and a buffer pad 10 is installed in the first limiting groove 71. Alternatively, a plurality of installation grooves 9 can be opened, and the plurality of installation grooves 9 are arranged at intervals along the axial direction, so that the fixed fixture 522 can be installed corresponding to different installation grooves 9.

[0062] See Figure 3 and Figure 5, the tightening die 53 includes a sliding base 531 and a tightening clamp 532. The sliding base 531 is sleeved on the tightening sleeve 51 and is located on the side close to the housing 1 relative to the fixed base 521. The sliding base 531 is slidably arranged relative to the tightening sleeve 51. The sliding base 531 is coaxially fitted with the piston screw rod 33. A synchronization component 6 is provided between the tightening die 53 and the piston screw rod 33. The synchronization component 6 includes a sliding block 61 and a transmission member 62. The sliding block 61 is connected to the end of the piston screw rod 33. A positioning ring groove 81 is formed around the outer peripheral wall of the sliding block 61. Positioning holes 82 are formed along the opposite side walls of the sliding base 531. The two positioning holes 82 can be aligned and communicated with the positioning ring groove 81. The tightening sleeve 51 is provided with limiting grooves 15. There are two limiting grooves 15, which are symmetrically arranged on the opposite sides of the tightening sleeve 51. The length direction of the limiting grooves 15 is arranged corresponding to the sliding direction of the sliding base 531. The tightening die 53 is provided with two transmission members 62. The transmission members 62 can be selected as bolts. The rod bodies of the two transmission members 62 pass through the two positioning holes 82 one by one, and then pass through the corresponding limiting grooves 15 on both sides until the ends are embedded in the positioning ring grooves 81 on both sides. The threads of the transmission members 62 are connected in the corresponding positioning holes 82. The positioning holes 82 are counterbored holes, and the connecting ends of the transmission members 62 are hidden in the positioning holes 82 to achieve the fixed connection of the transmission members 62.

[0063] The tightening clamp 532 is installed above the sliding base 531. The installation method is that a plurality of installation grooves 9 are formed on the outer wall of the sliding base 531. In this embodiment, the case where the sliding base 531 is provided with one installation groove 9 is shown. The lower part of the tightening clamp 532 is embedded in the installation groove 9, and a bolt passes through the tightening clamp 532 and is connected to the sliding base 531. A second limiting groove 72 is formed on the upper part of the tightening clamp 532, and a buffer pad 10 is installed in the second limiting groove 72.

[0064] See Figure 7 , the pipe joint 200 is embedded into the expanded pipe end of the pipe fitting 100. The pipe joint 200 is clamped in the first limiting groove 71 and forms a butt joint limit with the side wall of the buffer pad 10 in the first limiting groove 71. A sliding sleeve 300 is sleeved outside the pipe fitting 100. The pipe fitting 100 is embedded in the second limiting groove 72. The sliding sleeve 300 abuts against the side wall of the second limiting groove 72. The driving motor 31 drives the piston screw rod 33 to move in the second direction through the transmission component 11. The second direction is opposite to the first direction. The piston screw rod 33 drives the sliding block 61 and the sliding base 531 to slide through the transmission member 62, so that the sliding base 531 moves towards the direction close to the fixed base 521. The tightening clamp 532 pushes the sliding sleeve 300 until the sliding sleeve 300 is sleeved outside the embedded end of the pipe joint 200, thereby completing the pressing operation.

[0065] The specific working process of this solution is as follows:

[0066] In this technical solution, a driving motor 31 installed in a housing 1 drives a rotatably arranged lead screw sleeve 32 to rotate. A piston lead screw 33 that is in threaded engagement with the lead screw sleeve 32 performs a sliding movement under the drive of the lead screw sleeve 32. Its sliding direction reciprocates between a first direction and a second direction that are oppositely arranged. When the piston lead screw 33 slides in the first direction (forward), a conical piston 41 fixed to the end of the piston lead screw 33 is pushed forward. The conical piston 41 expands a pipe expanding die 42 on its front side, realizing the pipe expanding action on a pipe fitting 100. Insert a pipe joint 200 into the expanded pipe section of the pipe fitting 100. Place the pipe joint 200 on a fixed die 52, and place a sliding sleeve 300 sleeved on the pipe fitting 100 on a sliding tightening die 53. Then reverse the driving motor 31 to drive the lead screw sleeve 32 to drive the piston lead screw 33 to slide in the opposite second direction (backward). The piston lead screw 33 drives the sliding tightening die 53 to move backward through a transmission member 62, so that it is pulled closer to the fixed die 52. The sliding tightening die 53 pushes the sliding sleeve 300 to be sleeved on the expanded pipe part of the pipe fitting 100 outside the pipe joint 200. The pipe expanding and tightening actions are independently driven by the forward and reverse sliding of the piston lead screw 33 respectively, avoiding mutual interference in power transmission and improving the use stability of the tool.

[0067] Embodiment 2:

[0068] See Figure 8 、 Figure 9 and Figure 10 A kind of electric pipe expanding and tightening tool, which is different from the first embodiment in that both the pipe expanding mechanism 4 and the tightening mechanism 5 are located on the same side of the housing 1, and the pipe expanding mechanism 4 is located outside relative to the tightening mechanism 5. One end of the piston lead screw 33 along the sliding direction passes through a sliding tightening sleeve 51 and is connected to the sliding tightening die 53, and the end is connected to the conical piston 41. One end of a sliding block 61 is connected to the end of the piston lead screw 33, and the other end is connected to the rear end of the conical piston 41. The fixed die 52 is sleeved on one end of the sliding tightening sleeve 51 close to the housing 1, and the sliding tightening die 53 is located outside relative to the fixed die 52 and close to the pipe expanding mechanism 4. When the driving motor 31 drives the piston lead screw 33 to move in the first direction through a transmission assembly 11 and a lead screw sleeve 32, the first direction is set outward to control the operation of the pipe expanding mechanism 4. When the driving motor 31 drives the piston lead screw 33 to move in the second direction, at this time, the sliding tightening die 53 is pulled to cooperate with the fixed die 52 to perform the pressing operation on the sliding sleeve 300.

[0069] The above has shown and described the basic principles, main features and advantages of the present technical solution. Those skilled in the art should understand that the present technical solution is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present technical solution. Without departing from the spirit and scope of the present technical solution, the present technical solution will have various changes and improvements, and all these changes and improvements fall within the scope of the present technical solution claimed. The scope of protection required by the present technical solution is defined by the appended claims and their equivalents.

Claims

1. An electric pipe expanding and tightening tool, comprising a housing (1), and the housing (1) has an installation cavity (2), characterized in that, Further comprising: A driving assembly, which is installed in the installation cavity (2). The driving assembly includes a driving motor (31), a lead screw sleeve (32), and a piston lead screw (33). The piston lead screw (33) is slidably arranged in the installation cavity (2), and the lead screw sleeve (32) is rotatably arranged in the installation cavity (2) and is in threaded cooperation with the piston lead screw (33); A pipe expanding mechanism (4), which includes a conical piston (41) and a pipe expanding die (42). The conical piston (41) is fixedly arranged at the end of the piston lead screw (33), and the pipe expanding die (42) is arranged on the front side of the conical piston (41); A tightening mechanism (5), which includes a sliding tightening sleeve (51), a fixed die (52) arranged on the sliding tightening sleeve (51), and a sliding tightening die (53). The fixed die (52) is fixedly sleeved on the sliding tightening sleeve (51), the sliding tightening die (53) is slidably sleeved on the sliding tightening sleeve (51) and is connected to the piston lead screw (33). The sliding tightening sleeve (51) is rotatably arranged on the housing (1) through a steering adjustment mechanism (16); The driving motor (31) drives the lead screw sleeve (32) to rotate. When the lead screw sleeve (32) drives the piston lead screw (33) to slide in the first direction, the piston lead screw (33) pushes the conical piston (41) out, so that the conical piston (41) expands the pipe expanding die (42) to expand the pipe; when the piston lead screw (33) slides in the opposite second direction, the piston lead screw (33) drives the sliding tightening die (53) to move, and the sliding tightening die (53) approaches the fixed die (52). The sliding tightening die (53) is used to push the sliding sleeve (300) to be sleeved on the pipe fitting (100) outside the pipe joint (200).

2. The electric pipe expanding and tightening tool according to claim 1, characterized in that: The steering adjustment mechanism (16) includes a limiting sleeve (163), a locking member (161), and an elastic member (162). The outer side of the limiting sleeve (163) is connected to the housing (1), and the inner side of the limiting sleeve (163) is sleeved on the sliding tightening sleeve (51) and abuts against it for limiting, so as to prevent the sliding tightening sleeve (51) from detaching; The sliding tightening sleeve (51) is provided with a plurality of installation grooves (18), and the elastic members (162) are installed in the installation grooves (18). The two ends of the elastic members (162) respectively abut against the locking member (161) and the bottom of the installation groove (18). The limiting sleeve (163) is correspondingly provided with a fixed gear groove (19); When the sliding tightening sleeve (51) rotates relative to the limiting sleeve (163), the locking member (161) is fitted into the fixed gear groove (19). The elastic force of the elastic member (162) makes the locking member (161) tend to abut against the bottom of the installation groove (18), so as to position the rotation of the sliding tightening sleeve (51).

3. The electric pipe expanding and tightening tool according to claim 1, characterized in that: One end of the piston lead screw (33) is connected to the conical piston (41), and the other end is connected to the sliding tightening die (asd).

4. The electric pipe expanding and tightening tool according to claim 1, wherein: One end of the piston lead screw (33) in the sliding direction passes through the sliding tightening sleeve (51) and is connected to the sliding tightening die (53), and the end is connected to the conical piston (41).

5. An electric pipe expanding and tightening tool according to claim 3 or 4, characterized in that: The fixed mold (52) includes a fixed base (521) and a fixed clamp (522). At least one of the fixed clamps (522) is provided on the fixed base (521). The fixed base (521) is fixedly sleeved on the outer side of the tightening sleeve (51), and the fixed base (521) is provided with a first limiting groove (71). The tightening mold (53) includes a sliding base (531) and a tightening clamp (532). At least one of the tightening clamps (532) is provided on the sliding base (531). The sliding base (531) is slidably sleeved on the outer side of the tightening sleeve (51). The tightening clamp (532) is correspondingly provided with a second limiting groove (72). The second limiting groove (72) is arranged in alignment with the first limiting groove (71). The tightening clamp (532) and the fixed clamp (522) are respectively used to abut against the pipe joint (200) and the sliding sleeve (300).

6. The electric pipe expanding and tightening tool according to claim 5, wherein: Installation grooves (9) are formed in the side walls of both the fixed base (521) and the sliding base (531). The installation grooves (9) are respectively used for clamping and fixing the corresponding fixed clamp (522) and tightening clamp (532).

7. An electric pipe expanding and tightening tool according to claim 6, characterized in that: There are several of the installation grooves (9). The several installation grooves (9) are axially distributed on the corresponding fixed base (521) and sliding base (531). The fixed base (521) and the sliding base (531) are installed in corresponding different installation grooves (9) to adjust the clamping distance between the fixed clamp (522) and the tightening clamp (532).

8. An electric pipe expanding and tightening tool according to claim 5, characterized in that: Buffer pads (10) are installed in both the first limiting groove (71) and the second limiting groove (72).

9. The electric pipe expanding and tightening tool according to claim 1, characterized in that: A synchronous component (6) is provided between the tightening mold (53) and the piston screw rod (33). The synchronous component (6) includes a sliding block (61) provided at the end of the piston screw rod (33) and a transmission member (62). The sliding block (61) is slidably arranged in the tightening sleeve (51). The sliding block (61) is provided with a positioning ring groove (81). The sliding base (531) is correspondingly provided with positioning holes (82) along the opposite side walls. Limiting grooves (15) are correspondingly provided on the opposite side walls of the tightening sleeve (51). The length direction of the limiting grooves (15) is arranged corresponding to the sliding direction of the sliding block (61). The transmission member (62) passes through the positioning holes (82) and the sliding groove (9) and the rear end thereof is embedded in the positioning ring groove (81) to coaxially fix the sliding block (61) and the sliding base (531).

10. An electric pipe expanding and tightening tool according to claim 5, characterized in that: A transmission component (11) is provided between the driving motor (31) and the piston screw rod (33). The transmission component (11) includes: A driving shaft (111) which is rotatably arranged at the output end of the driving motor (31). A driving gear (112) which is coaxially sleeved and fixed on the driving shaft (111). The driven gear (113) is rotatably arranged in the installation cavity (2). The driven gear (113) is coaxially sleeved and fixed on the lead screw sleeve (32), and the driven gear (113) meshes with the driving gear (112). A plain bearing (12) is sleeved on the piston lead screw (33). The lead screw sleeve (32) and the sliding tightening sleeve (51) respectively abut against opposite sides of the plain bearing (12). A bearing member (13) is arranged in the housing (1), and the bearing member (13) is sleeved on the lead screw sleeve (32) for guiding rotation.

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