CN112317627A - Chuck clamping mechanism of electric tube expander and electric tube expander - Google Patents

Abstract

The invention belongs to the technical field of electric tools, in particular to a chuck clamping mechanism of an electric tube expander and the electric tube expander thereof, which comprise a placing seat, wherein a placing cavity is formed in the placing seat, and a chuck for clamping a pipe fitting to be processed is arranged in the placing cavity; the handle is rotatably arranged on one side of the placing seat, and is provided with a butting part which extends into the placing cavity; the handle is rotated to drive the abutting part to abut against the chuck in the placing cavity, so that the chuck is clamped. The chuck is clamped by the handle in a rotating and abutting mode, and compared with a connecting rod mechanism, the chuck clamping mechanism has the advantages that the rotating points are few, the number of required combined parts is few, the chuck clamping mechanism is more convenient to manufacture compared with a connecting rod mechanism, the whole structure is more stable, and the abutting point looseness caused by abrasion of the rotating points after long-term use of a product can be avoided.

Description

Chuck clamping mechanism of electric tube expander and electric tube expander

Technical Field

The invention belongs to the technical field of electric tools, and particularly relates to a chuck clamping mechanism of an electric tube expander and the electric tube expander.

Background

The eccentric expander is used for expanding pipes in connection of various pipes and containers in refrigeration, petroleum, chemical, shipbuilding, electric and other industries and is operated by means of the continuous rotation of conic eccentric head. The existing pipe expander generally comprises a manual pipe expander and an electric pipe expander, the manual pipe expander has the advantages of small size and light weight, but the knob needs to be rotated by one hand during pipe expansion, which wastes time and labor. The electric pipe expander has the advantages of time-saving and labor-saving pipe expanding processing, high pipe expanding efficiency and the like, so the electric pipe expander is increasingly popularized and applied. However, the position of the chuck body on the existing electric tube expander is often unable to be adjusted, which leads to the long-term use of the tube expander, and after the copper tube clamping fixing part of the chuck body is worn, in order to ensure the reliable fixation of the copper tube, the chuck body or even the tube expander can only be replaced, which leads to the reduction of the service life of the tube expander, and the use cost of users is increased.

The chinese utility model 201920403433.X discloses a clamping adjustment structure of a chuck body of an electric tube expander, which mainly fixes the chuck body through a link mechanism arranged in a link accommodating cavity; however, the link mechanism has many integral components, so that the link mechanism has many connection points, and after the link mechanism with the structure is used for a long time, the connection points between the links are easy to loosen, so that the integral link mechanism is loosened, and the clamping effect is influenced; moreover, the link mechanism has many integral parts, is complex to assemble and is inconvenient to use.

Disclosure of Invention

The invention aims to provide a chuck clamping mechanism and an electric tube expander, which have simple structures, can effectively improve the stability of a clamping mechanism and are convenient to assemble.

The purpose of the invention patent is realized as follows:

a chuck clamping mechanism of an electric tube expander comprises

The pipe fitting machining device comprises a placing seat, a machining head and a machining head, wherein a placing cavity is formed in the placing seat, and a chuck used for clamping a pipe fitting to be machined is arranged in the placing cavity;

the handle is rotatably arranged on one side of the placing seat, and is provided with a butting part which extends into the placing cavity; the handle is rotated to drive the abutting part to abut against the chuck in the placing cavity, so that the chuck is clamped.

The pipe expander further comprises a support shaft arranged on the pipe expander main body, wherein the handle is provided with a connecting hole, and the connecting hole is sleeved on the support shaft so as to enable the handle to be rotatably arranged on the support shaft; the supporting shaft is also provided with an eccentric section, and the handle is rotationally arranged on the eccentric section; the plane position of the eccentric section is adjusted by rotating the support shaft, and the rotation center of the abutting part of the handle is adjusted.

Further, the device also comprises a rotating groove arranged on the placing seat, and the supporting shaft is arranged in the rotating groove; the supporting shaft is provided with a protruding end located outside the rotating groove, and the protruding end is used for being connected with the handle.

Furthermore, the abutting part is also rotatably provided with a roller, and the roller is used for abutting against the chuck.

An electric tube expander comprises the chuck clamping mechanism of the electric tube expander and further comprises a tube expander main body, wherein the tube expander main body is provided with the placing seat, the placing seat is internally provided with the chuck, and the placing seat is further provided with an opening for placing the chuck into the placing cavity.

Further, the chuck comprises

The left chuck and the right chuck are rotationally connected and used for clamping a pipe fitting to be processed; clamping grooves for accommodating the pipe fittings to be processed are formed in the left chuck and the right chuck;

the operating end is used for opening the left chuck and the right chuck which are clamped mutually;

the limiting plate is arranged on one side of the end face of the left chuck or the right chuck and is fixedly connected with the left chuck or the right chuck;

the limiting plate is also provided with an extension limiting end, a clamping opening is formed when the left chuck and the right chuck are folded, and the extension limiting end is positioned on one side of the end surface of the clamping opening; when the left chuck and the right chuck are opened, the extending limiting end is positioned in the clamping groove in the left chuck or the right chuck for limiting.

Furthermore, the limiting plate is further provided with a groove opposite to the extending limiting end, a linkage shaft protrudes from the left chuck or the right chuck where the groove is located, and the linkage shaft is arranged in the groove.

Furthermore, the left chuck and the right chuck are provided with opposite connecting plates in a protruding mode, connecting holes are formed in the connecting plates, connecting shafts penetrate through the connecting holes, and limiting bosses are arranged at two ends of each connecting shaft.

Further, the operating end comprises a force application handle integrally formed on the left chuck and the right chuck.

Further, the expander body also comprises a shell, and a sliding cavity is arranged in the shell; the sliding block is arranged in the sliding cavity, and the tail end of the sliding block is provided with an eccentric pipe expanding conical head; the sliding block is connected with a driving mechanism, and the driving mechanism drives the sliding block to rotate back and forth along the sliding cavity;

and when the sliding block rotates in a reciprocating manner, the sliding block pushes the movable contact to attract the movable contact and the fixed contact to be conducted, and the driving mechanism is controlled to rotate forwards and backwards or stop through the conduction of the contact switch.

Compared with the prior art, the invention has the outstanding and beneficial technical effects that:

1. the chuck is clamped by the handle in a rotating and abutting mode, and compared with a connecting rod mechanism, the chuck clamping mechanism has the advantages that the rotating points are few, the number of required combined parts is few, the chuck clamping mechanism is more convenient to manufacture compared with a connecting rod mechanism, the whole structure is more stable, and the abutting point looseness caused by abrasion of the rotating points after long-term use of a product can be avoided.

2. The invention discloses a novel chuck, which is characterized in that an eccentric section is arranged on a supporting shaft of a handle, the direction of a convex part of the eccentric section is adjusted by adjusting the direction of the supporting shaft, so that the position of the handle connected with the eccentric section is correspondingly changed, the position of an abutting part on the handle is further adjusted, and the error caused by abrasion of a chuck due to long-term use is adapted through the adjustment.

3. The contact part of the invention is also provided with a roller, and the sliding friction between the contact part and the chuck is changed into rolling friction through the roller, thereby reducing the damage to the chuck caused by contact.

4. In the invention, the openings of the tube expanding cavity are arranged at the left side and the right side of the tube expanding cavity, the openings are used for the chuck to enter the tube expanding cavity, and when the openings are arranged at the left side and the right side of the tube expanding cavity, the chuck can be fixed in the tube expanding cavity from the transverse position; compared with the mode that the opening is arranged above the tube expanding cavity, the horizontal height of the side opening is low, and the clamping head is convenient to place.

5. In the invention, the limiting column and the abutting column are arranged in the expanding tube cavity, and the limiting column increases the clamping stability of the chuck, so that the chuck cannot loosen in the clamping process; the butt post is used for bearing the butt of chuck when the chuck is tight to reduce the chuck butt to placing the wearing and tearing of seat, increase life.

6. In the invention, the tube expanding cavity is also fixed with a limiting pressure plate, and the chuck is limited in the tube expanding cavity through the limiting pressure plate, so that the chuck cannot fall out from the upper part of the tube expanding cavity.

7. According to the invention, the linkage shaft is arranged on the limiting plate, and the linkage shaft is arranged on the chuck, so that when the chuck is opened, the linkage shaft drives the extension limiting end to move towards the direction of the clamping opening, and when the chuck is closed, the linkage shaft drives the extension limiting end to move towards the outside of the clamping opening, therefore, the effect of automatically adjusting the position of the limiting plate is achieved, and the operation is simpler and more convenient.

8. The invention discloses a clamping device, which is characterized in that a torsional spring piece is arranged in an accommodating cavity on one side of a connecting plate to automatically reset a chuck and clamp the chuck; the contact area between the torsional spring plate and the force application handle is large, so that larger and more stable elastic force is obtained.

9. According to the invention, the limiting plate is arranged on the axial opening of the accommodating cavity, and the limiting plate is provided with the concave part, so that the limiting boss of the connecting shaft is arranged in the concave part; when the chuck is used, one end face provided with the limiting plate can be attached to the tube expanding cavity of the electric tube expander due to use requirements, and the limiting boss is arranged in the concave part, so that the problem that the raised limiting boss influences the normal work of the tube expander when the chuck is attached to the tube expanding cavity is well prevented

Drawings

FIG. 1 is a schematic illustration of the present invention patent;

FIG. 2 is a schematic view of the hold-down pressure plate opening;

FIG. 3 is a schematic view of a handle;

FIG. 4 is an exploded view of the handle;

FIG. 5 is a schematic view of a support shaft;

fig. 6 is a schematic view of the main body of the electric expander.

Fig. 7 is a schematic view of an eccentric section of the electric expander;

fig. 8 is a schematic view of the electric expander after adjustment of the eccentric section;

FIG. 9 is a schematic view of the structure of the chuck;

FIG. 10 is a schematic view of the internal structure of the chuck;

FIG. 11 is a schematic view of the opened state of the chuck;

fig. 12 is a transverse cross-sectional view of the top of the expander;

fig. 13 is a longitudinal sectional view of the top of the expander;

FIG. 14 is a schematic view of a worm gear case 1;

FIG. 15 is a schematic view of a worm gear case 2;

FIG. 16 is a schematic view of the elements within the worm gear case;

fig. 17 is an exploded view of the worm gear case.

The reference numerals in the figures denote the meanings:

1. a placement chamber; 2. a chuck; 3. a communicating cavity; 4. a handle; 41. an abutting portion; 42. connecting holes; 43. a roller; 44. a fastener; 45. a connecting arm; 5. a rotating groove; 6. a support shaft; 61. an eccentric section; 62. a raised end; 63. a limiting boss; 7. a tube expander body; 8. a placing seat; 81. an opening; 91. a limiting column; 92. a through groove; 10. a butting post; 11. and a limiting pressure plate.

21. A left chuck; 22. a right chuck; 221. a linkage shaft; 222. accommodating grooves; 23. a clamping groove; 24. a limiting plate; 241. an extended limit end; 242. a groove; 243. a recess; 25. a connecting plate; 26. a connecting shaft; 261. a limiting boss; 27. a force application handle; 28. an accommodating chamber; 281. twisting the elastic sheet; 282. and the axial direction is opened.

71. A housing; 72. a slide chamber; 73. a slider; 74. a pipe expanding conical head; 75. a contact switch; 751. a movable contact electrode; 752. fixing a contact pole; 76. a worm gear case; 77. a worm gear; 78. a worm; 79. a screw; 710. a threaded hole; 711. a top rod; 712. a first boss; 713. a limiting spring; 714. a flat bond; 715. a first key groove; 716. steel jacket; 717. a conduction groove; 718. an accommodating chamber; 719. a second boss; 720. a second key groove; 721. a compression spring; 722. a worm wheel seat.

Detailed Description

The invention is further described in the following examples:

an electric pipe expander comprises a pipe expander body 7, wherein a chuck 2 is arranged on the pipe expander body 7, a pipe to be processed is clamped in the chuck 2, an eccentric conical head capable of automatically rotating in a reciprocating manner is further arranged in the pipe expander body 7, and the pipe fixed on the chuck 2 is automatically expanded through the automatic reciprocating rotation of the eccentric conical head; the expander body 7 further comprises a handle for holding the entire electrically powered expander.

The electric tube expander is also provided with a clamping mechanism for clamping and fixing the chuck 2 positioned in the placing cavity 1 when in use, thereby preventing the tube expanding effect from being influenced by the deviation of the chuck 2 in the placing cavity 1; specifically, as shown in fig. 2 and 3, in addition to the placing cavity 1, the placing cavity also comprises

The placing seat 8 is formed with the placing cavity 1 in the placing seat 8, and the clamping head 2 used for clamping the pipe fitting to be processed is arranged in the placing cavity 1; a communicating cavity 3 communicated with the placing cavity 1 is formed on the placing seat 8;

the handle 4 is rotatably arranged on one side of the placing seat; the handle 4 is provided with a contact part 41, and the contact part 41 is positioned in the conduction cavity 3; the clamping of the cartridge 2 is performed by rotating the handle 4 bringing said abutment 41 into abutment against the cartridge 2 in the placing chamber 1.

In this embodiment, the pipe expander further comprises a rotating slot 5 arranged on the pipe expander, wherein a supporting shaft 6 is arranged in the rotating slot 5; the supporting shaft 6 is provided with a convex end 62 positioned outside the rotating groove 5, the handle 4 is connected with the supporting shaft 6, specifically, the handle 4 is provided with a left connecting arm 45 and a right connecting arm 45, the connecting arms 45 are provided with connecting holes 42, the connecting holes 42 are respectively sleeved on the two convex ends 62 of the supporting shaft 6, the supporting shaft 6 is provided with a fastener 44 to limit the handle 4 on the supporting shaft 6, and therefore the handle 4 is rotatably arranged on the main body of the tube expander; as shown in fig. 3, the supporting shaft 6 is formed with a limiting boss 63 at one end thereof and a fastening nut, i.e., the fastening member 44, at the other end thereof, and is correspondingly provided with an elastic washer, by which the handle 4 is fixed to the supporting shaft 6 to be rotated.

In this embodiment, the through cavity 3 is disposed below the placing cavity 1, and the connecting arm 45 extends toward the through cavity 3 to form the abutting portion 41; by turning the handle 4, the abutment 41 is turned inside the feedthrough chamber 3. A corresponding abdicating part is arranged in the conducting cavity 3, when the chuck 2 is not clamped, the handle 4 is positioned in front of the handle on the expander main body 7 and forms a certain included angle with the handle, and the abutting part 41 on the handle 4 is correspondingly positioned in the abdicating part; when the chuck 2 is clamped, a user drives the handle 4 to rotate towards the handle direction, so that the abutting part 41 on the handle 4 rotates forwards along the conduction cavity 3 until the contact part passes through the conduction cavity 3 to the placing cavity 1 and abuts against the chuck 2 in the placing cavity 1, and at the moment, the chuck 2 is clamped in the placing cavity 1 due to the extrusion of the abutting part 41, so that the further pipe expansion is facilitated.

The clamping device clamps the chuck 2 in a manner of rotating and abutting the handle 4, and compared with a link mechanism, the clamping device has the advantages that the number of rotating points is small, the number of required combined parts is small, the manufacturing is more convenient, the integral structure is more stable, and the abutting point looseness caused by the abrasion of the rotating points after long-term use of a product can be avoided.

Further, as shown in fig. 2, a roller 43 is rotatably provided on the abutting portion 41, the roller 43 is used for abutting against the collet 2, and sliding friction between the abutting portion 41 and the collet 2 is changed into rolling friction by the roller 43, thereby reducing damage to the collet 2 caused by the abutment.

In other embodiments, the supporting shaft 6 may be integrally formed on one side of the expander, and the handle 4 may be provided with only one connecting arm 45 rotatably connected to the supporting shaft 6.

In the patent of the invention, a clamping adjusting structure is further provided, as shown in fig. 4, specifically, an eccentric section 61 is further provided on the supporting shaft 6, the handle 4 is rotatably provided on the eccentric section 61, and the plane position of the eccentric section 61 is adjusted by rotating the supporting shaft 6. As shown in fig. 4 and 5, the eccentric section 61 is specifically an eccentric boss, the eccentric section 61 protrudes from the normal surface of the support shaft 6, and when the support shaft 6 rotates, the plane position of the eccentric section 61 on the end surface of the expander body changes correspondingly with the rotation of the support shaft 6; referring to fig. 7 and 8 specifically, the connecting hole 42 on one side of the handle 4 is sleeved on the eccentric section 61, and when the plane position of the eccentric section 61 changes, the plane position of the handle 4 is driven to change correspondingly, so that the rotation center of the abutting portion 41 is improved, and the movement track of the abutting portion 41 when the handle 4 rotates is changed correspondingly; for example, when the support shaft 6 is rotated, the eccentric end of the eccentric section 61 is horizontally upward or horizontally downward, and the horizontal upward or horizontal downward of the eccentric end causes the height of the eccentric section 61 to be changed, thereby changing the position of the handle 4. The user can adjust the horizontal position of the eccentric section 61 by rotating the support shaft 6 by holding the end of the support shaft 6, which is not provided with the eccentric section 61, with a tool, such as the above-mentioned limit projection 63 formed at the end of the support shaft 6.

The invention provides a novel hand-held chuck, which is characterized in that an eccentric section 61 is arranged on a supporting shaft 6 of a handle 4, the direction of a convex part of the eccentric section 61 is adjusted by adjusting the direction of the supporting shaft 6, so that the position of the handle 4 connected with the eccentric section 61 is correspondingly changed, the position of an abutting part 41 on the handle 4 is adjusted, and errors caused by abrasion of a chuck 2 due to long-term use are adapted through the adjustment.

Further, a placing seat 8 is arranged on the expander body 7, the placing seat 8 is an annular convex edge arranged on one side of the expander body 7, and the placing cavity 1 is formed in the annular convex edge; notches are arranged on the convex edges on the lower side and the right side, and the communicating cavity 3 and an opening 81 for placing the chuck 2 are formed.

Further, as shown in fig. 6, a limiting post 91 is disposed on a wall of the placing cavity 1 opposite to the conducting cavity 3, a through groove 92 opposite to the limiting post 91 is disposed on the chuck 2, the limiting post 91 is an iron piece and is fixed on the wall of the placing cavity 1 and protrudes from the wall of the placing cavity, the through groove 92 is a groove, when the chuck 2 is clamped, the groove covers the limiting post 91 for limiting, so that the chuck 2 is prevented from being fed during pipe expansion and affecting pipe expansion.

Furthermore, a plurality of abutting columns 10 are further arranged on the wall of the placing cavity 1, and when the chuck 2 is clamped in the placing cavity 1, the chuck 2 abuts against the abutting columns 10. As shown in fig. 6, the abutting columns 10 are disposed on two sides of the limiting column 91, the protruding degree of the abutting columns is smaller than that of the limiting column 91, and the abutting columns mainly bear the abutting of the chuck 2 when the chuck 2 is clamped, so that the abrasion of the chuck 2 abutting against the placing base 8 is reduced, and the service life of the whole placing base 8 is prolonged; the abutment post 10 may also be provided on the chamber wall in other orientations.

Furthermore, a limiting pressure plate 11 is further fixed on the placing cavity 1, and a notch smaller than the size of the chuck 2 is formed in the limiting pressure plate 11 and used for limiting the chuck 2 in the placing cavity 1. The limiting pressure plate 11 is provided with a threaded hole and fixed above the placing seat 8 through a screw, the chuck 2 is limited in the placing cavity 1, so that the chuck 2 cannot fall out from the place cavity 1, and the notch is used for exposing the pipe fitting to be processed in the chuck 2.

Further, the chuck 2 includes a left chuck 21 and a right chuck 22 rotatably connected to each other for clamping a pipe to be processed, and when the left chuck 21 and the right chuck 22 are clamped, a clamping opening for accommodating the pipe to be processed is formed, as shown in fig. 9, the left chuck 21 and the right chuck 22 are respectively provided with a clamping groove 23, and when the left chuck 21 and the right chuck 22 are clamped, the clamping grooves 23 are spliced to form the clamping opening. The clamping device further comprises an operating end, the left clamping head 21 and the right clamping head 22 are clamped to be opened by applying force to the operating end, and the operating end can be a force application handle 27 integrally formed on the left clamping head 21 and the right clamping head 22.

Further, the clamping device also comprises a limit plate 24 arranged on one side of the end surface of the clamping opening, the limit plate 24 is fixedly connected with the right chuck 22, the limit plate 24 is also provided with an extension limit end 241, when the left chuck 21 and the right chuck 22 are folded, the clamping opening is formed, and meanwhile, the extension limit end 241 is positioned on one side of the end surface of the clamping opening; when the left and right chucks 21 and 22 are opened, the extension limiting end 241 is located at one side of the end surface of the holding groove 23 in the left or right chuck 21 or 22 for limiting.

Specifically, as shown in fig. 9, the retainer plate 24 includes an extending limiting end 241 and a groove 242 facing the left chuck 21 and the right chuck 22, respectively, a linkage shaft 221 protrudes from the right chuck 22, and the linkage shaft 221 is disposed in the groove 242. The limiting plate 24 is used for positioning the pipe fitting placed in the clamping opening, before the pipe fitting is placed in, the limiting plate 24 can be pulled to enable the extending limiting end 241 on the limiting plate 24 to be located on the clamping opening, the pipe fitting to be machined is placed in at the moment, and the pipe fitting to be machined is limited in front of the clamping opening by the extending limiting end 241. In the invention, the extended limiting end 241 of the limiting plate 24 limits the pipe to be processed, and the limiting plate 24 is automatically pulled when the chuck is opened or closed by the structure of the groove 242 and the linkage shaft 221.

Specifically, when the clamp is not opened, the extension limiting end 241 and the groove 242 are respectively located on the end surfaces of the left chuck 21 and the right chuck 22 at the two sides of the clamping opening, the right chuck 22 is provided with an accommodating groove 222, the linkage shaft 221 is protruded in the accommodating groove 222, and the linkage shaft 221 is located in the groove 242; after the force application handle 27 is applied with force, as shown in fig. 11, the clamping opening is opened to make the left chuck 21 and the right chuck 22 be far away, and the limiting plate 24 is fixed on the right chuck 22 due to the structure of the groove 242 and the linkage shaft 221, so that the extending limiting end 241 of the limiting plate 24 is located on the clamping opening along with the distance of the left chuck 21; when the clamping opening is closed, the retainer plate 24 moves along with the right clamping head 22 due to the structure of the groove 242 and the retainer plate 24, and therefore returns to the end face of the left clamping head 21 when the clamping opening is closed. Therefore, the chuck is simpler and more convenient to operate by the effect of automatically adjusting the position of the limit plate 24 through the structure.

Besides the structure of the groove 242 and the linkage shaft 221, the retainer plate 24 can be directly fixed on the right chuck 22 through a fixing member, such as a threaded screw or a welded fixing structure, which can also achieve the above function, but the linkage shaft 221 has a simple form and structure and is convenient to install. It should be noted that, for convenience of understanding, the groove 242 and the linkage shaft 221 are directly disposed on the right chuck 22 in the present embodiment, and actually, the groove 242 and the linkage shaft 221 may also be disposed on the left chuck 21, which belongs to a simple direction change and still belongs to the protection content of the present invention.

Further, as shown in fig. 10, the left chuck 21 and the right chuck 22 are protruded with opposite connecting plates 25, the connecting plates 25 are provided with connecting holes, a connecting shaft 26 is provided through the connecting holes, and both ends of the connecting shaft 26 are provided with limit bosses 261. The connecting shaft 26 is specifically a pin shaft and a pin which are connected, and the top parts of the pin shaft and the pin are provided with the limiting bosses 261 for limiting mutually; besides the form of the pin shaft and the pin, the connecting structure can also adopt a threaded form.

Furthermore, a containing cavity 28 is formed in one side of the connecting plate 25, a torsion spring piece 281 is arranged in the containing cavity 28, and two ends of the torsion spring piece 281 are respectively abutted to the force application handles 27 on two sides. As shown in fig. 10, the connecting plate 25 in the present embodiment is provided with only one pair, so that the accommodating cavities 28 are formed on both sides of the connecting plate 25, and the accommodating cavities 28 are in axial communication with the outside, forming axial openings 282; in order to place the torsion spring piece 281, the connecting plate 25 is disposed at a side end surface corresponding to the chuck. The use of the torsion spring sheet 281 is advantageous in that the contact area of the torsion spring sheet 281 with the force application handle 27 is large, thereby obtaining a more stable elastic force.

Further, the limiting plate 24 is provided with a concave portion 243 for being sunk in the accommodating cavity 28; the retainer plate 24 is fixed on the axial opening 282 through the connecting shaft 26, and the retainer boss 261 of the connecting shaft 26 is located in the recess 243; as shown in fig. 9 and 11, the recess 243 is provided at the rotation point of the stopper plate 24, and the recess 243 is matched with the size of the axial opening 282 such that the recess 243 completely fits over the axial opening 282 and is supported by the stopper plate 24 except for the recess 243.

When the chuck is used, the limiting plate 24 is used for limiting before clamping, so that a pipe to be machined protrudes out of the other end of the chuck, and one end face of the chuck, provided with the limiting plate 24, is required to be abutted against the placing cavity when the chuck is installed; if the limiting plate 24 is structurally connected with the limiting boss 261 through the connecting shaft 26, the protruding limiting boss 261 abuts against the placing cavity, so that the clamping work of the placing cavity is affected. Therefore, in order to solve the above problems, the present invention adopts the form of the concave portion 243, and the limiting boss 261 is disposed in the concave portion 243, so as to compensate the protruding length of the limiting boss 261, and thus the limiting boss 261 does not exist to affect the clamping operation of the chuck.

Further, a stroke positioning mechanism is further provided in the electric expander, as shown in fig. 16, the expander body 7 further includes a housing 71, and a sliding cavity 72 is provided in the housing 71;

the sliding block 73 is arranged in the sliding cavity 72, and the tail end of the sliding block 73 is provided with an eccentric pipe expanding conical head 74; the slide block 73 is connected with a driving mechanism and is driven by the driving mechanism, and the slide block 73 rotates back and forth along the slide cavity 72;

the sliding cavity 72 is provided with a contact switch 75 at the front end and the rear end, the contact switch 75 comprises a movable contact 751 and a fixed contact 752, when the sliding block 73 rotates in a reciprocating manner, the movable contact 751 is pushed by the sliding block 73 to enable the movable contact 751 and the fixed contact 752 to be attracted and connected for conduction, and the conduction of the contact switch 75 controls the driving mechanism to rotate positively and negatively or stop rotating

Further, the driving mechanism comprises a worm wheel 77 box 76 arranged in the housing 71, the worm wheel 77 box 76 is internally provided with a worm wheel 77 and a worm 78 which are meshed with each other, the worm 78 is connected with a motor, and the motor drives the worm 78 to rotate so as to drive the worm wheel 77 to rotate; a worm wheel 77 seat is further arranged in the worm wheel 77, and the sliding cavity 72 is formed in the worm wheel 77 seat; the slide block 73 is further provided with a screw 79 in the axial direction, the worm wheel 77 box 76 is provided with a threaded hole 710 opposite to the screw 79, the threaded hole 710 can be a nut member fixed at the bottom of the worm wheel 77 box 76, and the threaded hole 710 is formed in the nut member; the sliding block 73 is connected with the worm wheel 77 seat, when the worm wheel 77 seat rotates, the sliding block 73 is driven to rotate, meanwhile, the sliding block 73 moves towards a side shaft due to the meshing transmission of the screw rod 79 and the threaded hole 710, namely, the forward rotation and the reverse rotation of the worm wheel 77 respectively correspond to the forward movement or the backward movement of the sliding block 73, so that the reciprocating rotation of the sliding block 73 is realized through the structure, and the pipe to be processed fixed at the tail end of the sliding cavity 72 is expanded through the reciprocating rotation. Specifically, a placing seat is arranged outside the sliding cavity 72, a clamping head for clamping the pipe to be processed is arranged on the placing seat, and the placing seat is fixed on one side of the sliding cavity 72.

Further, as shown in fig. 14, 15, and 17, a through hole is formed in the bottom of the worm gear 77 box 76, the top bar 711 is located in the through hole, a first boss 712 is formed on the top bar 711, a limit spring 713 is further sleeved on the top bar 711 between the first boss 712 and the bottom of the worm gear 77 box 76, so that the top bar 711 always protrudes into the worm gear 77 box 76, and the movable contact 751 is fixed to the other end of the top bar 711 through a screw; when the device works, the sliding block 73 is driven by the worm wheel 77 to move towards the bottom of the worm wheel 77 box 76, so that the normal surface of the sliding block 73 is abutted against the ejector rod 711, the ejector rod 711 moves outwards, and the movable contact 751 is attracted with the fixed contact 752. In this embodiment, the fixed contact 752 is a contact piece fixed at the outer bottom of the worm gear 77 box 76, and the movable contact 751 is a contact piece fixed at the other end of the top rod 711.

According to the invention, the slide block 73 is abutted against the top rod 711 arranged at the bottom of the worm wheel 77 box 76 for rear limit, when the screw 79 is in transmission with the threaded hole 710, the threaded hole 710 is relatively fixed, the screw 79 relatively moves, compared with the mode that the threaded hole 710 moves and the screw 79 is relatively fixed, the volume of the screw 79 is larger than that of the threaded hole 710, so that the threaded hole 710 is easier to mount on the worm wheel 77 box 76 than the threaded hole 79, and the worm wheel 77 box 76 after the threaded hole 710 is mounted is also convenient for mounting the top rod 711.

Further, as shown in fig. 13, flat keys 714 are arranged on two sides of the sliding block 73, a first key groove 715 is arranged in the worm wheel 77 seat, and the flat keys 714 are located in the first key groove 715, so that the sliding block 73 is connected with the worm wheel 77 seat through the limit of the first key groove 715, and the sliding block 73 can be driven to rotate when the worm wheel 77 seat rotates; the sliding block 73 may also be fixed with the worm wheel 77 seat by a fixing member, an adhesive, or the like. Furthermore, the sliding block 73 is also sleeved with a steel sleeve 716, and a groove for accommodating the steel sleeve 716 is arranged in the seat of the worm wheel 77; the fixed contact 752 is arranged on the worm wheel 77 seat on one side of the steel sleeve 716, as shown in fig. 12, a conduction groove 717 is arranged on the worm wheel 77 seat on one side of the steel sleeve 716, the fixed contact 752 is arranged in the conduction groove 717, the fixed contact 752 is specifically a spring piece, one end of the spring piece is abutted against the steel sleeve 716, and the other end of the spring piece is connected with a control circuit; at this time, the movable contact 751 is the flat key 714, in the patent of the present invention, the flat key 714 is also connected with a control circuit, and when the slider 73 continuously moves forward to make the flat key 714 contact with the steel sleeve 716, the contact switch 75 is conducted, so that the control circuit where the contact switch 75 is located is conducted, the motor is stopped, and the forward limit of the slider 73 is further realized.

It should be noted that the fixed contact 752 may also be disposed on the housing 71, that is, when the groove for accommodating the steel bushing 716 in the seat of the worm wheel 77 cannot completely accommodate the steel bushing 716, so that the steel bushing 716 is partially located outside and contacts with the housing 71, the fixed contact 752 may also be disposed on the housing 71, that is, a conduction groove 717 is disposed on the housing 71 on one side of the steel bushing 716, the fixed contact 752 is disposed in the conduction groove 717, and the control circuit connected to the fixed contact 752 may be directly connected from the outside of the housing 71, thereby facilitating the circuit laying. The fixed contact 752 may be integrally formed with the housing 71 or the worm wheel 77, but is inconvenient to manufacture, and is often formed with a channel 717.

The front end and the rear end of the sliding cavity 72 in the patent of the invention are provided with the contact switches 75, and the sliding block 73 is limited forwards and backwards by the limit switches when moving through the contact switches 75, so that the damage of the shell 71 and the pipe to be processed caused by forward transition or backward transition is prevented, and the use is safer compared with the use.

Furthermore, an accommodating cavity 718 is formed in the sliding block 73, a second boss 719 matched with the accommodating cavity 718 is arranged on the screw 79, a second key groove 720 is arranged on the second boss 719, the flat key 714 is arranged in the cavity wall of the accommodating cavity 718 in a penetrating manner, and two ends of the flat key 714 are respectively located in the first key groove 715 and the second key groove 720; a compression spring 721 is also arranged between the second boss 719 and the accommodating cavity 718. When the pipe expanding device is used, the screw 79 continuously pushes the sliding block 73 forwards, after the eccentric pipe expanding conical head 74 at the tail end of the sliding block 73 is abutted to a pipe fitting for pipe expanding, the sliding block 73 is blocked, but the screw 79 rotates along with the worm gear 77 and continuously forwards, so that the flat key 714 continuously forwards in the first key groove 715 and the second key groove 720 at the same time; the screw 79 is advanced while compressing the compression spring 721 in the accommodation chamber 718, and the compression spring 721 is compressed to have a larger restoring force, so that the advancing speed of the screw 79 is reduced by the restoring force, and the rotating speed of the worm wheel 77 is reduced by reducing the advancing speed of the screw 79, so that the rotating speed of the eccentric expander cone 74 is slowed down. At the later stage of pipe expanding operation, after the eccentric pipe expanding conical head 74 is completely abutted to the pipe fitting, the rotating speed of the eccentric pipe expanding conical head 74 is reduced, so that the pipe expanding effect can be effectively increased, and the pipe expanding is more stable and uniform.

The expander of the present patent works by first, before starting, said slider 73 is located at the extreme end of the sliding chamber 72 and touches the contact switch 75 located at the extreme end; at the moment, the pipe expanding operation can be started, a user presses a starting button, the motor rotates forwards and drives the sliding block 73 to move forwards through the transmission of the worm 78 and the worm gear 77 so as to expand the pipe; when the flat key 714 on the sliding block 73 touches the steel sleeve 716, the contact switch 75 at the front end of the sliding cavity is switched on, and the pipe expander just completes one-time pipe expansion; when the sliding block 73 touches the contact switch 75 at the front end of the sliding cavity, the motor rotates reversely and drives the sliding block 73 to move backwards through the transmission of the worm 78 and the worm wheel 77 for resetting until the sliding block 73 touches the contact switch 75 at the tail end and then stops; at this time, the slider 73 is reset and waits for the next start.

The above embodiments are only preferred embodiments of the present invention, and not intended to limit the scope of the present invention, therefore: all equivalent changes made according to the structure, shape and principle of the invention shall be covered by the protection scope of the invention.

Claims (10)

1. The utility model provides a chuck clamping mechanism of electronic expander which characterized in that: comprises that

The pipe fitting machining device comprises a placing seat (8), wherein a placing cavity (1) is formed in the placing seat (8), and a chuck (2) used for clamping a pipe fitting to be machined is arranged in the placing cavity (1);

the handle (4) is rotatably arranged on one side of the placing seat (8), a butting part (41) is arranged on the handle (4), and the butting part (41) extends into the placing cavity (1); the handle (4) is rotated to drive the abutting part (41) to abut against the chuck (2) in the placing cavity (1), so that the chuck (2) is clamped.

2. The collet clamping mechanism of an electric expander as defined in claim 1, wherein: the pipe expander is characterized by further comprising a supporting shaft (6) arranged on the pipe expander body (7), a connecting hole (42) is formed in the handle (4), and the connecting hole (42) is sleeved on the supporting shaft (6) so that the handle (4) is rotatably arranged on the supporting shaft (6); the supporting shaft (6) is also provided with an eccentric section (61), and the handle (4) is rotationally arranged on the eccentric section (61); the plane position of the eccentric section (61) is adjusted by rotating the support shaft (6), and the center of rotation of the abutting section (41) of the handle (4) is adjusted.

3. The collet clamping mechanism of an electric expander as defined in claim 2, wherein: the device also comprises a rotating groove (5) arranged on the placing seat (8), and the supporting shaft (6) is arranged in the rotating groove (5); the supporting shaft (6) is provided with a protruding end (62) positioned outside the rotating groove (5), and the protruding end (62) is used for being connected with the handle (4).

4. A chuck clamping mechanism for an electric expander according to any one of claims 1-3 and wherein: the abutting part (41) is further rotatably provided with a roller (43), and the roller (43) is used for abutting against the chuck (2).

5. An electric expander including a collet clamping mechanism of an electric expander as claimed in any one of claims 1-4, wherein: still include expander main part (7), be equipped with on expander main part (7) place seat (8), be equipped with in placing seat (8) chuck (2), place and still be equipped with on seat (8) and supply chuck (2) are put into opening (81) of placing chamber (1).

6. An electric expander as claimed in claim 5, wherein: the clamping head (2) comprises

The left chuck (21) and the right chuck (22) are rotationally connected and are used for clamping the pipe fitting to be processed; clamping grooves (23) for accommodating the pipe fitting to be processed are formed in the left chuck (21) and the right chuck (22);

the operation end is used for opening the left chuck (21) and the right chuck (22) which are clamped mutually;

the limiting plate (24) is arranged on one side of the end face of the left chuck (21) or the right chuck (22) and is fixedly connected with the left chuck (21) or the right chuck (22);

the limiting plate (24) is also provided with an extension limiting end (241), when the left chuck (21) and the right chuck (22) are folded, a clamping opening is formed, and meanwhile, the extension limiting end (241) is positioned on one side of the end face of the clamping opening; when the left chuck (21) and the right chuck (22) are opened, the extending limiting end (241) is positioned in a clamping groove (23) in the left chuck (21) or the right chuck (22) for limiting.

7. An electric expander as claimed in claim 6, wherein: the limiting plate (24) is further provided with a groove (242) opposite to the extending limiting end (241), a linkage shaft (221) protrudes from the left chuck (21) or the right chuck (22) where the groove (242) is located, and the linkage shaft (221) is arranged in the groove (242).

8. An electric expander as claimed in claim 6 or 7, wherein: the left chuck (21) and the right chuck (22) are provided with opposite connecting plates (25) in a protruding mode, connecting holes are formed in the connecting plates (25) and penetrate through the connecting holes, connecting shafts (26) are arranged, and limiting bosses (261) are arranged at two ends of each connecting shaft (26).

9. An electric expander as claimed in claim 7, wherein: the operating end comprises a force application handle (27) which is integrally formed on the left chuck (21) and the right chuck (22).

10. An electric expander as claimed in claim 5, wherein: the expander main body (7) further comprises a machine shell (71), and a sliding cavity (72) is arranged in the machine shell (71);

the device also comprises a sliding block (73) which is arranged in the sliding cavity (72), and the tail end of the sliding block (73) is provided with an eccentric pipe expanding conical head (74); the sliding block is connected with a driving mechanism, and the sliding block (73) is driven by the driving mechanism to rotate back and forth along the sliding cavity (72);

the sliding cavity (72) is provided with contact switches (75) at the head end and the tail end, each contact switch (75) comprises a movable contact (751) and a fixed contact (752), when the sliding block (73) rotates in a reciprocating mode, the movable contact (751) is pushed by the sliding block (73) to enable the movable contact (751) and the fixed contact (752) to be attracted and combined for conducting, and the driving mechanism is controlled to rotate forwards and backwards or stop through the conduction of the contact switches.

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