A power expansion and tightening tool

Abstract

This technical solution belongs to the field of pipe expanding tool technology, specifically relating to an electric pipe expanding and tightening tool, including: a housing with an installation cavity; a drive device and a lead screw sleeve rotatably disposed in the installation cavity; a piston lead screw slidably disposed in the installation cavity and threadedly engaged with the piston lead screw; a pipe expanding mechanism including a conical piston and a pipe expanding mold, the conical piston being fixed to the end of the piston lead screw, and the pipe expanding mold being disposed on the front side of the conical piston; a tightening mechanism including a sliding sleeve, a fixed mold, and a sliding mold, the fixed mold being fixedly sleeved on the sliding sleeve, the sliding mold being slidably sleeved on the sliding sleeve and connected to the piston lead screw, the sliding sleeve being rotatably disposed in the housing via a steering adjustment mechanism; the drive device drives the lead screw sleeve to rotate, the lead screw sleeve driving the piston lead screw to move in two opposite directions, causing the piston lead screw to push the conical piston to open the pipe expanding mold and expand the pipe; the piston lead screw drives the sliding mold to move closer to the fixed mold, for pushing the sliding sleeve to fit onto the pipe fitting outside the pipe joint.

Description

Technical Field

[0001] This technical solution relates to the field of pipe expanding tool technology, specifically an electric pipe expanding and tightening tool. Background Technology

[0002] A pipe expander is a tool used to expand the end of a pipe to form a flared, cup-shaped, or other desired shape, thereby enlarging the pipe. The flared end can be connected to a pipe fitting. A tightening tool is used to fasten or compress pipe connections by tightening a sleeve onto the flared end of the pipe to press it against the fitting.

[0003] For example, Chinese patent CN106180432A discloses a tube expanding and tightening tool, which includes a guide tube, a hydraulic cylinder disposed inside the guide tube, a piston rod disposed inside the hydraulic cylinder, a tube expander connected to the front end of the piston rod, the rear end of the tube expander located inside the guide tube, a fixed chuck and a movable chuck disposed outside the guide tube, the fixed chuck being fixedly disposed at the front end of the guide tube, a limiting strip hole a is formed along the axial direction on the guide tube, a movable cylindrical pin a is disposed in the limiting strip hole a, and the movable chuck is fixedly connected to the piston rod inside the tube through the movable cylindrical pin a.

[0004] The aforementioned pipe expanding and tightening tool integrates pipe expanding and tightening functions. Since the expanding and tightening actuators in this tool share the same piston rod as the power output source, when the user performs expanding and tightening operations simultaneously, the hydraulic cylinder driving force must simultaneously take into account the radial expansion force required for expanding the pipe and the axial locking force required for clamping. This easily leads to an imbalance in the power distribution of the piston rod, and the effective output power is continuously consumed by the two loads. Furthermore, the efficiency attenuation during the mechanical energy transmission process affects the process effect and results in poor stability during use. Summary of the Invention

[0005] This technical solution aims to improve the problem of poor stability in existing integrated pipe expanding and tightening tools due to the simultaneous operation of the expanding and tightening actuators affecting power transmission. It provides an electric pipe expanding and tightening tool.

[0006] The purpose of this technical solution is achieved as follows: An electric pipe expander and tightener tool includes a housing having a mounting cavity, and further includes: The drive unit is installed inside the mounting cavity. A lead screw sleeve, which is rotatably mounted within the mounting cavity; A piston screw, which is slidably disposed within the mounting cavity and threadedly engaged with the piston screw; A tube expanding mechanism includes a conical piston and a tube expanding mold, wherein the conical piston is fixed to the end of the piston screw and the tube expanding mold is disposed on the front side of the conical piston; A tightening mechanism includes a sliding sleeve, a fixed mold disposed on the sliding sleeve, and a sliding mold. The fixed mold is fixedly sleeved on the sliding sleeve, and the sliding mold is slidably sleeved on the sliding sleeve and connected to the piston screw. The sliding sleeve is rotatably disposed on the housing through a steering adjustment mechanism. The driving device drives the lead screw sleeve to rotate, and the lead screw sleeve drives the piston lead screw to move. When the piston lead screw slides along the first direction, the piston lead screw pushes the conical piston out, so that the conical piston expands the pipe expansion mold to expand the pipe. When the piston lead screw slides along the opposite second direction, the piston lead screw drives the sliding clamping mold to move. The sliding clamping mold moves closer to the fixed mold. The sliding clamping mold is used to push the sliding sleeve to fit onto the pipe fitting outside the pipe joint.

[0007] Through the above technical solution, the drive device installed on the housing drives the rotating lead screw sleeve to rotate. The piston lead screw, which is threaded with the lead screw sleeve, slides under the drive of the lead screw sleeve. Its sliding direction changes back and forth along the first and second directions that are set in opposite directions. When the piston lead screw slides along the first direction (forward), the conical piston fixed at the end of the piston lead screw is pushed forward. The conical piston opens the pipe expansion mold on its front side, realizing the pipe expansion action of the fitting. The pipe joint is inserted into the expansion section of the fitting. The pipe joint is placed in the fixed mold. The sliding sleeve fitted on the fitting is placed in the sliding tight mold. Then the drive device reverses, drives the lead screw sleeve to drive the piston lead screw to slide along the opposite second direction (backward). The piston lead screw drives the sliding tight mold to move backward through the transmission pin, so that it is pulled closer to the fixed mold. The sliding tight mold pushes the sliding sleeve to fit on the pipe expansion part of the fitting outside the pipe joint. The expansion and tightening actions are driven independently by the forward and reverse sliding of the piston lead screw, avoiding mutual interference of power transmission and improving the stability of the tool.

[0008] Preferably, the sliding sleeve is rotatably mounted on the housing via a steering adjustment mechanism. The steering adjustment mechanism includes a limiting sleeve, a locking element, and an elastic element. The outer side of the limiting sleeve is connected to the housing, and the inner side of the limiting sleeve is fitted onto the sliding sleeve and abuts against it for limiting the sliding sleeve from disengaging. The sliding sleeve has a plurality of first mounting slots, and the elastic element is installed in each of the first mounting slots. The two ends of the elastic element abut against the locking element and the bottom of the first mounting slot, respectively. The limiting sleeve has a corresponding positioning groove. When the sliding sleeve rotates relative to the limiting sleeve, the locking member is engaged with the positioning groove, and the elastic force of the elastic member causes the locking member to tend to press against the bottom of the first mounting groove, which is used to rotate and position the sliding sleeve.

[0009] Through the above technical solution, the outer side of the limiting sleeve of the shell is connected to the shell, and the inner side is fitted onto the sliding sleeve and abuts against it for limiting, effectively preventing the sliding sleeve from axially disengaging; a steering adjustment mechanism is installed in each of the several first mounting slots opened in the sliding sleeve. The mechanism consists of a locking component and an elastic component. The two ends of the elastic component abut against the locking component and the bottom of the first mounting slot, respectively. When the sliding sleeve is rotated, the locking component is engaged with the positioning groove. At the same time, the elastic force of the elastic component continues to act on the locking component, making it tend to press against the bottom of the first mounting slot, thereby achieving precise positioning during the rotation of the sliding sleeve and realizing multi-level adjustment.

[0010] Preferably, one end of the piston screw is connected to the conical piston, and the other end is connected to the sliding mold.

[0011] Through the above technical solution, the piston screw directly and independently drives the two core actions of expanding and tightening the tube along a single reciprocating linear motion, thereby improving the stability and reliability of the tool operation.

[0012] Preferably, one end of the piston screw along the sliding direction passes through the sliding sleeve and is connected to the sliding mold, and the other end is connected to the conical piston.

[0013] By directly connecting the sliding mold to the end of the piston screw that passes through the sliding sleeve, and fixing the conical piston to the end of the screw, the expansion and tightening actions are both located on the same side of the piston screw, eliminating the need to turn the housing for use and improving convenience.

[0014] Preferably, the fixing mold includes a fixing base and a fixing clamp, at least one of the fixing clamps is provided on the fixing base, the fixing base is fixedly sleeved on the outside of the sliding sleeve, and the fixing base is provided with a first limiting groove; The sliding clamping mold includes a sliding base and a sliding clamping fixture. At least one sliding clamping fixture is provided on the sliding base. The sliding base is slidably sleeved on the outside of the sliding clamping sleeve. The sliding clamping fixture is provided with a second limiting groove, which is aligned with the first limiting groove. The sliding clamping fixture and the sliding clamping fixture are respectively used to abut against the pipe joint and the sliding sleeve.

[0015] Through the above technical solution, the fixed base is fixedly sleeved on the outside of the sliding sleeve, and the first limiting groove on it abuts against the pipe joint through the fixed clamp. The sliding base is slidably sleeved on the outside of the sliding sleeve, and the second limiting groove of the sliding clamp is aligned with the first limiting groove. The second limiting groove carried by the sliding clamp moves closer to the first limiting groove of the fixed clamp. During this process, the sliding clamp pushes the sliding sleeve sleeved on the pipe to move towards the pipe joint. The second limiting groove and the first limiting groove work together to accurately abut and limit the pipe joint and the sliding sleeve, so as to achieve stable clamping and axial positioning during pipe assembly, optimize the uniformity of the tightening force distribution, and improve the assembly stability.

[0016] Preferably, both the fixed base and the sliding base have a second mounting groove on their sidewalls, and the second mounting groove is used for the corresponding fixed clamp and sliding clamp to be engaged and fixed.

[0017] Through the above technical solution, the fixed base and the sliding base are installed by embedding them in the second mounting groove at the bottom and fixing them with bolts, which realizes quick positioning and installation, ensures that the positions of the limiting grooves between the two are aligned, and further improves the stability of axial force.

[0018] Preferably, there are several second mounting slots, which are distributed axially on the corresponding fixed base and sliding base. The fixed base and sliding base are equipped with different second mounting slots to adjust the clamping distance between the fixed clamp and the sliding clamp.

[0019] Through the above technical solution, the fixed clamp and the sliding clamp can be installed in the second mounting slot at different positions on the corresponding base. By adjusting the axial installation position of the clamp, the initial clamping distance can be changed, which is suitable for the assembly of pipe fittings of different specifications, and improves the compatibility of the tool with sliding sleeves of different pipe diameters and the assembly efficiency.

[0020] Preferably, buffer pads are installed in both the first limiting groove and the second limiting groove.

[0021] Through the above technical solution, by installing buffer pads in the first and second limiting grooves, the buffer pads absorb impact energy through their own deformation, evenly disperse local stress during pipe assembly, reduce assembly vibration and noise, avoid surface scratches caused by hard contact between metal clamps and pipes, and the buffer pads can be replaced separately, reducing wear on the fixed clamps and sliding clamps during long-term use and extending their service life.

[0022] Preferably, a synchronization component is provided between the sliding mold and the piston screw. The synchronization component includes a sliding block disposed at the end of the piston screw and a transmission component. The sliding block is slidably disposed in the sliding sleeve. The sliding block has a positioning ring groove. The sliding base has positioning holes corresponding to each other along opposite sidewalls. The sliding sleeve is provided with a limiting groove along the opposite sidewall. The length direction of the limiting groove is set in 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 to make the sliding block and the sliding base coaxially fixed.

[0023] Through the above technical solution, the sliding block is connected to the end of the piston screw. The sliding block is adjusted so that its positioning ring groove is connected to the limiting groove. The sliding base is moved until the position of the positioning hole on the sliding base is connected to the positioning ring groove. At this time, the positioning ring groove, positioning hole and sliding groove are aligned and connected. Then, the end of the transmission component is inserted into the positioning ring groove after passing through the positioning hole and the limiting groove. The transmission component is threaded to the positioning hole. At this time, the axial cooperation between the sliding base and the sliding block is realized. The transmission component can move along the sliding groove to ensure that the sliding block can move smoothly. The transmission component can abut against the opposite side wall of the sliding groove to further limit the radial deflection of the sliding block and the piston screw. The groove extension of the limiting groove guides the movement of the transmission component to ensure that the sliding base pushes the sliding clamp along a straight trajectory, improves stability and ensures assembly reliability.

[0024] Preferably, a transmission assembly is provided between the drive device and the piston screw, the transmission assembly comprising: A drive shaft, which is rotatably mounted at the output end of the drive device; The drive gear is coaxially sleeved and fixed on the drive shaft; The driven gear is rotatably disposed in the mounting cavity. The driven gear is coaxially sleeved on the lead screw sleeve and fixed, and the driven gear meshes with the driving gear. The piston screw sleeve is equipped with a plane bearing, and the screw sleeve and the sliding sleeve respectively abut against the opposite sides of the plane bearing. The housing is provided with a bearing component, which is sleeved on the screw sleeve for guiding rotation.

[0025] Through the above technical solution, the drive device drives the drive shaft to rotate. Based on the coaxial fixation of the drive shaft and the active gear, the drive shaft drives the active gear to rotate, the active gear drives the driven gear meshing with it to rotate, and the driven gear drives the lead screw sleeve to rotate, thereby realizing the sliding of the piston lead screw and ensuring operational reliability.

[0026] The end of the lead screw sleeve abuts against the plane bearing, providing radial support and guidance. The peripheral wall of the sliding sleeve abuts against the bearing component, which guides the lead screw sleeve to rotate, reducing the frictional resistance when the lead screw sleeve rotates and improving the stability and rotational guidance of power transmission efficiency.

[0027] The key and beneficial technical effects of this technical solution compared to existing technologies are: 1. This technical solution uses a sliding sleeve that is rotatably connected to the housing by a steering adjustment mechanism. The steering adjustment mechanism includes a limiting sleeve, a locking component, and an elastic component. The elastic component pushes the locking component to abut against the positioning groove of the limiting sleeve. By rotating the sliding sleeve, adaptive adjustment and positioning are achieved, changing the position orientation of the fixed mold and the sliding mold, optimizing the ease of operation in narrow spaces, reducing interference between tools, solving the problem of observation and operation difficulties caused by the fixed direction of the sliding sleeve and the pipe joint, and improving convenience. 2. This technical solution uses the bidirectional sliding of the piston screw to independently drive the conical piston to push out the expansion action of the expansion mold, and uses the transmission component to pull the sliding mold to push the tightening action of the sliding sleeve pressing pipe joint. This avoids the expansion and tightening happening simultaneously, reduces mutual interference in power transmission, and improves the stability of the tool. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of Example 1; Figure 2 This is a partial cross-sectional view of Example 1; Figure 3 As in Example 1 Figure 2 Partial structural diagram; Figure 4 As in Example 1 Figure 2 Enlarged view of a portion; Figure 5 This is a schematic diagram of a partial explosion in Example 1; Figure 6 This is a structural diagram of the tightening operation in Example 1; Figure 7 This is a schematic diagram of the overall structure of Example 2; Figure 8 This is a partial cross-sectional view of Example 2; Figure 9 Example 2 Figure 8 Enlarged view of a portion of the diagram.

[0029] Reference numerals: 1. Housing; 2. Mounting cavity; 32. Lead screw sleeve; 33. Piston lead screw; 4. Expanding mechanism; 41. Conical piston; 42. Expanding mold; 5. Tightening mechanism; 51. Sliding sleeve; 52. Fixed mold; 521. Fixed base; 522. Fixed clamp; 53. Sliding mold; 531. Sliding base; 532. Sliding clamp; 6. Synchronization assembly; 61. Sliding block; 62. Transmission component; 71. First limiting groove; 72. Second limiting groove; 81. Positioning ring groove; 82. Positioning hole; 9. Second mounting groove; 10. Buffer pad; 11. Transmission assembly; 111. Drive shaft; 112. Drive gear; 113. Driven gear; 12. Surface bearing; 13. Bearing component; 15. Limiting groove; 16. Steering adjustment mechanism; 161. Locking component; 162. Elastic component; 163. Limiting sleeve; 18. First mounting groove; 19. Positioning groove; 100. Pipe fitting; 200. Pipe connector; 300. Sliding sleeve. Detailed Implementation

[0030] The specific implementation of this technical solution will be further described in detail below with reference to the accompanying drawings.

[0031] Example 1: See Figure 1 and Figure 2 An electric pipe expander and tightener tool includes a housing 1, which has a mounting cavity 2. A drive device, preferably a drive motor, is installed in the mounting cavity 2 and mounted in the handle area at the bottom of the mounting cavity 2.

[0032] It also includes a lead screw sleeve 32 and a piston lead screw 33. The piston lead screw 33 is laterally disposed on the upper part of the mounting cavity 2 and is movably disposed relative to the mounting cavity 2. A transmission assembly 11 is provided between the piston lead screw 33 and the driving device. The transmission assembly 11 includes a drive shaft 111, a driving gear 112, and a driven gear 113. The drive shaft 111 is located above the driving device, and its lower end is connected to the output end of the driving device and is rotatably disposed relative to the mounting cavity 2. Both the driving gear 112 and the driven gear 113 are preferably bevel gears. The bevel gear has a conical structure with teeth distributed along the conical surface. It is used for transmission between intersecting shafts (such as 90°). It can change direction and transmit power with high efficiency. The driving gear 112 is sleeved on the end of the drive shaft 111 and is fixed coaxially with the drive shaft 111. The driven gear 113 is sleeved on the piston screw 33 and is fixed coaxially with the piston screw 33. The teeth of the driven gear 113 mesh with the teeth of the driving gear 112. The meshing surface is set at an angle. Both the driving gear 112 and the driven gear 113 are rotatably mounted in the mounting cavity 2.

[0033] The lead screw sleeve 32 is fitted on the outside of the piston lead screw 33 and threadedly engaged with it. The lead screw sleeve 32 is rotatably mounted relative to the mounting cavity 2. The piston lead screw 33 sleeve 32 is provided with a plane bearing 12. One end of the lead screw sleeve 32 abuts against the rotating side of the plane bearing 12, and the other end is embedded in one side opening of the driven gear 113. A bearing component 13 is also fitted on the outside of the lead screw sleeve 32. The outer side of the bearing component 13 is engaged with the inner wall of the mounting cavity 2 and fixed, while its inner side abuts against the outer peripheral wall of the lead screw sleeve 32. The bearing component 13 cooperates with the plane bearing 12 to guide the rotation of the lead screw sleeve 32 and reduce friction.

[0034] It also includes a tube expanding mechanism 4 and a tightening mechanism 5. The tube expanding mechanism 4 and the tightening mechanism 5 are respectively installed on the front and rear sides of the housing 1. The tube expanding mechanism 4 located on the rear side includes a tube expanding mold 42 and a conical piston 41. The conical piston 41 is embedded in the mounting cavity 2 and is fixedly connected to the end of the piston rod 33 away from the tightening mechanism 5. The conical surface of the conical piston 41 is set outward. The tube expanding mold 42 is located on the side of the conical piston 41 away from the piston rod 33. It is detachably installed on the housing 1. In this embodiment, it is shown that the tube expanding mold 42 has a conical cavity near the conical piston 41 that is adapted to its shape and size. The front end can be embedded in the conical cavity on the rear side of the expansion mold 42; the end of the pipe fitting 100 is fitted onto the outside of the expansion mold 42, and the drive shaft 111 is driven to rotate by the drive device. The drive shaft 111 drives the drive gear 112 to rotate, the drive gear 112 drives the meshing driven gear 113 to rotate, and the driven gear 113 drives the piston screw 33 to move along the first direction. The piston screw 33 pushes the conical piston 41 to move outward. Since the expansion mold 42 includes multiple hinged movable molds, the conical piston 41 simultaneously pushes open multiple movable molds, thereby realizing that the expansion mold 42 opens the end of the pipe fitting 100 and completes the expansion operation.

[0035] See Figure 2 , Figure 4 and Figure 5 The tightening mechanism 5 includes a sliding sleeve 51, a fixing mold 52, and a sliding mold 53. The sliding sleeve 51 is located on the side of the housing 1 away from the tube expansion mechanism 4. The sliding sleeve 51 is rotatably connected to the housing 1. In this embodiment, the sliding sleeve 51 has a cavity inside. One end of the cavity is connected to the inside of the mounting cavity 2, and the other end is connected to the outside. The piston screw 33 extends towards the sliding sleeve 51 from the end away from the conical piston 41 and is embedded in the cavity.

[0036] The sliding sleeve 51 is rotatably connected to the housing 1 via a steering adjustment mechanism 16. This steering adjustment mechanism 16 includes a limiting sleeve 163, a locking member 161, and an elastic member 162. The limiting sleeve 163 is fitted onto the outer side of the sliding sleeve 51. In this embodiment, the sliding sleeve 51 is shown with a protrusion portion, which is embedded inside the limiting sleeve 163. The limiting sleeve 163 restricts the separation of the sliding sleeve 51 from the housing 51 and provides a gap between itself and the sliding sleeve 51 to allow for smooth rotation. The outer wall of the limiting sleeve 163 is threadedly connected to the inner wall of the housing 1. The sliding sleeve 51 has several first mounting grooves 18. All are located on the end face of the protrusion of the sliding sleeve 51 near the limiting sleeve 163. The elastic element 162 is preferably a return spring. Several elastic elements 162 are embedded in several first mounting grooves 18 one by one. The locking element 161 is preferably a ball. One end of each elastic element 162 abuts against the bottom of the corresponding first mounting groove 18, and the other end abuts against the locking element 161. The limiting sleeve 163 has a positioning groove 19. There are several positioning grooves 19, and the number is the same as that of the locking elements 161. Several positioning grooves 19 correspond one-to-one with several locking elements 161, so that the elastic force of the elastic element 162 pushes the locking element 161 to be embedded in the positioning groove 19 one-to-one.

[0037] The fixed mold 52 includes a fixed base 521 and a fixed clamp 522. The fixed base 521 is sleeved on the outside of the sliding sleeve 51 and is fixed to the end of the sliding sleeve 51 away from the housing 1. The fixed base 521 has two bolt holes, which are respectively opened on opposite side walls of the fixed base 521. The sliding sleeve 51 has threaded holes corresponding to the two bolt holes. Bolts pass through the corresponding bolt holes, and the bolt threads are connected in the threaded holes. The bolt head is hidden in the bolt hole, thereby realizing bolt fixation between the fixed base 521 and the sliding sleeve 51. The fixed clamp 522 is installed on the fixed mold. Above the base 521, the mounting method involves fixing the base 521 by providing several second mounting slots 9 on its outer wall. This embodiment shows the case where only one second mounting slot 9 is provided. The lower part of the fixing clamp 522 is embedded in the second mounting slot 9, and the bolt passes through the fixing clamp 522 and is connected to the fixing base 521. The upper part of the fixing clamp 522 is provided with a first limiting slot 71, and a buffer pad 10 is installed in the first limiting slot 71. Alternatively, multiple second mounting slots 9 can be provided, and the multiple second mounting slots 9 are spaced apart along the axial direction so that the fixing clamp 522 can be installed in different second mounting slots 9.

[0038] See Figure 3 and Figure 3The sliding mold 53 includes a sliding base 531 and a sliding clamping fixture 532. The sliding base 531 is sleeved on the sliding sleeve 51 and is positioned relative to the fixed base 521 on the side closer to the housing 1. The sliding base 531 is slidably disposed relative to the sliding sleeve 51. The sliding base 531 is coaxially engaged with the piston screw 33. A synchronization component 6 is provided between the sliding mold 53 and the piston screw 33. The synchronization component 6 includes a sliding block 61 and a transmission component 62. The sliding block 61 is connected to the end of the piston screw 33. The sliding block 61 has a positioning ring groove 81 around its outer peripheral wall. The sliding base 531 has positioning holes 82 along opposite side walls. The positioning holes 82 on both sides can engage with the positioning ring groove 81. 1. Alignment and conduction: The sliding sleeve 51 has two limiting grooves 15, which are symmetrically located on opposite sides of the sliding sleeve 51. The length direction of the limiting grooves 15 corresponds to the sliding direction of the sliding base 531. The sliding mold 53 has two transmission components 62, which can be bolts. The rods of the two transmission components 62 pass through the positioning holes 82 on both sides, and then through the corresponding limiting grooves 15 on both sides, until the ends are embedded in the positioning ring grooves 81 on both sides. The threaded connection of the transmission component 62 is in the corresponding positioning hole 82. The positioning hole 82 is a countersunk hole. The connecting end of the transmission component 62 is hidden in the positioning hole 82, realizing the fixed connection of the transmission component 62.

[0039] The sliding clamp 532 is installed above the sliding base 531. The installation method is that the outer wall of the sliding base 531 has a number of second mounting grooves 9. In this embodiment, the sliding base 531 is shown to have one second mounting groove 9. The lower part of the sliding clamp 532 is embedded in the second mounting groove 9. The bolt passes through the sliding clamp 532 and is connected to the sliding base 531. The upper part of the sliding clamp 532 has a second limiting groove 72. A buffer pad 10 is installed in the second limiting groove 72.

[0040] See Figure 6 The pipe connector 200 is embedded into the expanded end of the pipe fitting 100. The pipe connector 200 is snapped into the first limiting groove 71 and forms an abutment limit with the side wall of the buffer pad 10 in the first limiting groove 71. A sliding sleeve 300 is provided on the outer sleeve of the pipe fitting 100. The pipe fitting 100 is embedded into the second limiting groove 72. The sliding sleeve 300 abuts against the side wall of the second limiting groove 72. The driving device drives the piston screw 33 to move along the second direction through the transmission assembly 11. The second direction is opposite to the first direction. The piston screw 33 drives the sliding block 61 and the sliding base 531 to slide through the transmission component 62, so that the sliding base 531 moves towards the fixed base 521. The sliding clamp 532 pushes the sliding sleeve 300 until the sliding sleeve 300 is fitted on the outside of the embedded end of the pipe connector 200, thereby completing the clamping operation.

[0041] The specific work process of this plan is as follows: This technical solution involves a drive device installed on the housing 1 driving a rotating lead screw sleeve 32 to rotate. The piston screw 33, threadedly engaged with the lead screw sleeve 32, slides under the drive of the lead screw sleeve 32, reciprocating between a first direction and a second direction. When the piston screw 33 slides along the first direction (forward), the conical piston 41 fixed at the end of the piston screw 33 is pushed forward, opening the expansion mold 42 on its front side, thus expanding the pipe fitting 100. The pipe connector 200 is then inserted into the expanded section of the pipe fitting 100. The sliding sleeve 300, which is fitted onto the pipe fitting 100, is placed in the fixed mold 52 and then placed in the sliding mold 53. The drive device reverses, and the drive screw sleeve 32 drives the piston screw 33 to slide in the opposite second direction (backward). The piston screw 33 drives the sliding mold 53 to move backward through the transmission component 62, so that it is pulled closer to the fixed mold 52. The sliding mold 53 pushes the sliding sleeve 300 to fit onto the pipe fitting 100 expansion part outside the pipe joint 200. The expansion and tightening actions are driven independently by the forward and reverse sliding of the piston screw 33, avoiding mutual interference of power transmission and improving the stability of the tool.

[0042] Example 2: See Figure 7 , Figure 8 and Figure 9 An electric tube expander and tightener tool, differing from Embodiment 1 in that the tube expander mechanism 4 and the tightening mechanism 5 are both located on the same side of the housing 1, and the tube expander mechanism 4 is located on the outside relative to the tightening mechanism 5. One end of the piston screw 33 along the sliding direction passes through the sliding sleeve 51 and is connected to the sliding mold 53, and the end is connected to the conical piston 41. One end of the sliding block 61 is connected to the end of the piston screw 33, and the other end is connected to the rear end of the conical piston 41. The fixed mold 52 is sleeved on the end of the sliding sleeve 51 near the housing 1, and the sliding mold 53 is located on the outside near the tube expander mechanism 4 relative to the fixed mold 52. When the driving device drives the piston screw 33 to move in the first direction through the transmission assembly 11 and the screw sleeve 32, the first direction is set outward, controlling the operation of the tube expander mechanism 4. When the driving device drives the piston screw 33 to move in the second direction, the sliding mold 53 is pulled, so that the sliding mold 53 cooperates with the fixed mold 52 to perform the pressing operation of the sliding sleeve 300.

[0043] The foregoing has shown and described the basic principles, main features, and advantages of this technical solution. Those skilled in the art should understand that this technical solution is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this technical solution. Various changes and modifications can be made to this technical solution without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed technical solution. The scope of protection of this technical solution is defined by the appended claims and their equivalents.

Claims

1. An electric tube expanding and tightening tool comprising a housing (1) having a mounting cavity (2), characterized in that, Also includes: The drive unit is installed inside the mounting cavity (2). A lead screw sleeve (32) is rotatably disposed within the mounting cavity (2); The piston screw (33) is slidably disposed in the mounting cavity (2) and threadedly engaged with the piston screw (33); The tube expanding mechanism (4) includes a conical piston (41) and a tube expanding mold (42). The conical piston (41) is fixed to the end of the piston screw (33), and the tube expanding mold (42) is disposed on the front side of the conical piston (41). The tightening mechanism (5) includes a sliding sleeve (51) disposed on the housing, a fixed mold (52) disposed on the sliding sleeve (51) and a sliding mold (53). The fixed mold (52) is fixedly sleeved on the sliding sleeve (51), and the sliding mold (53) is slidably sleeved on the sliding sleeve (51) and connected to the piston screw (33). The driving device drives the lead screw sleeve (32) to rotate, and the lead screw sleeve (32) drives the piston lead screw (33) to move. When the piston lead screw (33) slides along the first direction, the piston lead screw (33) pushes the conical piston (41) out, so that the conical piston (41) expands the pipe expansion mold (42) to expand the pipe. When the piston lead screw (33) slides along the opposite second direction, the piston lead screw (33) drives the sliding mold (53) to move. The sliding mold (53) approaches the fixed mold (52). The sliding mold (53) is used to push the sliding sleeve (300) to be fitted onto the pipe fitting (100) outside the pipe joint (200).

2. The electric pipe expander and tightener tool according to claim 1, characterized in that: One end of the piston screw (33) is connected to the conical piston (41), and the other end is connected to the sliding mold (53).

3. The electric pipe expander and tightener tool according to claim 1, characterized in that: One end of the piston screw (33) along the sliding direction passes through the sliding sleeve (51) and is connected to the sliding mold (53), and the other end is connected to the conical piston (41).

4. An electric pipe expander and tightener tool according to claim 2 or 3, characterized in that: The sliding sleeve (51) is rotatably mounted on the housing (1) via a steering adjustment mechanism (16). 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 fitted onto the sliding sleeve (51) and abuts against it to limit its movement, thereby preventing the sliding sleeve (51) from disengaging. The sliding sleeve (51) has a plurality of first mounting grooves (18), and the elastic element (162) is installed in each of the first mounting grooves (18). The two ends of the elastic element (162) abut against the locking element (161) and the bottom of the first mounting groove (18) respectively. The limiting sleeve (163) has a corresponding fixing groove (19). When the sliding sleeve (51) rotates relative to the limiting sleeve (163), the locking member (161) is fitted relative to the positioning groove (19), and the elastic force of the elastic member (162) makes the locking member (161) tend to press against the bottom of the first mounting groove (18) for rotating and positioning the sliding sleeve (51).

5. The electric pipe expander and tightener tool according to claim 4, characterized in that: The fixed mold (52) includes a fixed base (521) and a fixed clamp (522). At least one fixed clamp (522) is provided on the fixed base (521). The fixed base (521) is fixedly sleeved on the outside of the sliding sleeve (51). The fixed base (521) is provided with a first limiting groove (71). The sliding clamping mold (53) includes a sliding base (531) and a sliding clamping fixture (532). At least one sliding clamping fixture (532) is provided on the sliding base (531). The sliding base (531) is slidably sleeved on the outside of the sliding sleeve (51). The sliding clamping fixture (532) is provided with a second limiting groove (72). The second limiting groove (72) is aligned with the first limiting groove (71). The sliding clamping fixture (532) and the fixing fixture (522) are respectively used to abut against the pipe joint (200) and the sliding sleeve (300).

6. The electric pipe expander and tightener tool according to claim 5, characterized in that: The side walls of both the fixed base (521) and the sliding base (531) are provided with second mounting grooves (9), which are used for the corresponding fixed clamps (522) and sliding clamps (532) to be engaged and fixed.

7. The electric pipe expander and tightener tool according to claim 6, characterized in that: The second mounting groove (9) is provided in a plurality of them. The plurality of second mounting grooves (9) are distributed along the axial direction on the corresponding fixed base (521) and sliding base (531). The fixed base (521) and sliding base (531) are equipped with different second mounting grooves (9) for adjusting the clamping distance between the fixed clamp (522) and the sliding clamp (532).

8. The electric pipe expander and tightener tool according to claim 5, characterized in that: Both the first limiting groove (71) and the second limiting groove (72) are equipped with buffer pads (10).

9. The electric pipe expander and tightener tool according to claim 5, characterized in that: A synchronization component (6) is provided between the sliding mold (53) and the piston screw (33). The synchronization component (6) includes a sliding block (61) disposed at the end of the piston screw (33) and a transmission component (62). The sliding block (61) is slidably disposed in the sliding sleeve (51). The sliding block (61) is provided with a positioning ring groove (81). The sliding base (531) is provided with positioning holes (82) along the opposite sidewalls. The sliding sleeve (51) is provided with a limiting groove (15) along the opposite side wall. The length direction of the limiting groove (15) is set in accordance with the sliding direction of the sliding block (61). The transmission member (62) passes through the positioning hole (82) and the limiting groove (15) and is embedded in the positioning ring groove (81) to make the sliding block (61) and the sliding base (531) coaxially fixed.

10. The electric pipe expander and tightener tool according to claim 5, characterized in that: A transmission assembly (11) is provided between the drive device and the piston screw (33), and the transmission assembly (11) includes: A drive shaft (111) is rotatably disposed at the output end of the drive device; The drive gear (112) is coaxially sleeved and fixed on the drive shaft (111); Driven gear (113) is rotatably disposed in mounting cavity (2). The driven gear (113) is coaxially sleeved on the lead screw sleeve (32) and fixed, and the driven gear (113) meshes with the driving gear (112). The piston screw (33) is fitted with a plane bearing (12). The screw sleeve (32) and the sliding sleeve (51) abut against the opposite sides of the plane bearing (12). The housing (1) is provided with a bearing component (13), which is fitted on the screw sleeve (32) for guiding rotation.

Images