Electric pipe expander

Abstract

The utility model discloses an electric pipe expander, which belongs to the technical field of pipe expanders and comprises a spindle box, a rotating seat, a mandrel, a pipe expanding conical head and a power component, the rotating seat is driven by the power component to be rotatably arranged in the spindle box, and the mandrel is slidably arranged in the rotating seat and synchronously rotates with the rotating seat. The pipe expanding conical head is eccentrically connected to the front end of the mandrel, and the pipe expanding conical head is characterized in that a threaded connection structure is arranged between the mandrel and the spindle box and comprises external threads arranged on the peripheral face of the mandrel and internal threads arranged on the spindle box and matched with the external threads. The threaded connection structure is directly arranged between the mandrel and the spindle box, axial feeding movement of the mandrel is achieved, the structure is simple, the number of parts is small, machining and manufacturing difficulty and assembly complexity are reduced, and therefore production cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of pipe expander, especially a kind of electric pipe expander. BACKGROUND

[0002] Pipe expander is a kind of special tool for flaring processing of pipe fittings, making pipe and pipe, pipe and container tightly joint, it is widely used in the manufacture and repair of boiler, heat exchanger, condenser, cooler and other various pressure vessels in petroleum, chemical industry, electric power, metallurgy, shipbuilding, refrigeration and other industries, such as air conditioner installation or repair process, copper pipe is flared and treated by pipe expander. The existing pipe expander generally includes two kinds of manual pipe expander and electric pipe expander, manual pipe expander has the advantages of small size and light weight, but it needs to rotate knob with one hand when expanding pipe, which is time-consuming and laborious;Electric pipe expander has the advantages of time-saving and labor-saving, high efficiency, and is increasingly popular and applied.

[0003] Most of the existing electric pipe expanders are eccentric pipe expanders, which expand pipe by rotating eccentric cone head, generally including mandrel, worm gear mechanism, mandrel is slidingly arranged in the inner cavity of worm gear, the front end of mandrel is provided with eccentric pipe expansion cone head, worm gear mechanism drives mandrel to rotate and reciprocate along axial direction. In order to realize the axial movement of mandrel, the prior art adopts slightly different structures:

[0004] For example, a kind of electric pipe expander with stroke positioning mechanism is disclosed in Chinese patent with publication number CN213997534U, the mandrel (i.e. sliding block) is axially provided with a screw rod, a threaded hole opposite to the screw rod is formed on the worm gear box, the two sides of the mandrel are provided with a flat key, the two ends of the flat key are located in key groove one in the worm gear (i.e. worm gear seat) and key groove two of the screw rod respectively, when the worm gear rotates, the mandrel and the screw rod are driven to rotate together by the flat key, and the mandrel moves axially due to the transmission of the screw rod and the threaded hole;

[0005] For example, a kind of electric pipe expander is disclosed in Chinese patent with publication number CN109926506B, a guide screw rod with transmission nut is arranged on the pipe expander body, a flat key is arranged on the mandrel, the outer side end of the flat key is slidingly connected with the worm gear mechanism along axial direction, and the inner side end is slidingly connected in the axial key groove of transmission nut, the mandrel, flat key and transmission nut are driven to rotate together by worm gear mechanism, and the axial feeding of mandrel is realized under the cooperation of guide screw rod and transmission nut;

[0006] A Chinese patent with publication number CN118926423A discloses an electric pipe expander with floating pipe expansion effective stroke, a limit key is arranged on a mandrel, the limit key is inserted into an axial sliding groove in the inner wall of the center hole of the worm wheel, a guide screw is fixedly connected to the right inner wall of the shell, the left end of the guide screw is inserted into the center hole of the mandrel and is threadedly connected thereto, when the mandrel rotates with the worm wheel through the limit key, the mandrel moves axially under the action of the thread connection with the guide screw.

[0007] The mandrel feeding drive mechanism in the prior art has a relatively complex transmission structure, involves the cooperation of multiple components, is difficult to manufacture, has a complex assembly process, and has a high production cost. Practical new type content

[0008] The technical problem to be solved by the present application is to overcome the above problems, and to provide an electric pipe expander with a simple and reliable structure.

[0009] The technical scheme of the present application is:

[0010] An electric pipe expander comprises a main shaft box, a rotating seat, a mandrel, a pipe expansion cone head and a power assembly, the rotating seat is rotatably arranged in the main shaft box by the power assembly, the mandrel is slidably arranged in the rotating seat and rotates synchronously therewith, and the pipe expansion cone head is eccentrically connected to the front end of the mandrel, characterized in that: a threaded connection structure is arranged between the mandrel and the main shaft box, the threaded connection structure comprises an external thread arranged on the outer circumferential surface of the mandrel and an internal thread arranged on the main shaft box and matched with the external thread.

[0011] By arranging the threaded connection structure directly between the mandrel and the main shaft box, the axial feeding motion of the mandrel is realized, the screw rod structure is cancelled, the structure is simple, the number of components is small, the complex transmission mechanism is avoided, the manufacturing difficulty and assembly complexity are reduced, and the production cost is reduced.

[0012] Further, in the above electric pipe expander, a key groove matching structure is arranged between the mandrel and the rotating seat, so that the mandrel and the rotating seat rotate synchronously and can slide axially relative to each other.

[0013] As an optimization, in the above electric pipe expander, an axial sliding groove is arranged on the outer wall of the mandrel, and a radial protrusion matched with the sliding groove is arranged on the inner wall of the rotating seat, the sliding groove and the radial protrusion constitute the key groove matching structure. The cooperation of the sliding groove and the radial protrusion cancels the flat key structure, has a simple structure, fewer components, good guiding effect and stable and reliable operation.

[0014] As optimization, in the above-mentioned electric pipe expander, a nut member is fixedly arranged in the main shaft box, and an internal thread of the threaded connection structure is formed in the nut member. The internal thread is provided by a separate nut member, which facilitates processing and maintenance, and improves the maintainability of the product.

[0015] Further, in the above-mentioned electric pipe expander, the power assembly includes a motor and a meshed worm gear and worm shaft, the worm gear is fixedly connected with the rotating seat, and the worm shaft is connected with the motor.

[0016] As optimization, in the above-mentioned electric pipe expander, the worm gear and the rotating seat are integrally formed. Integrally forming the worm gear and the rotating seat further reduces the number of parts and simplifies the overall structure.

[0017] As optimization, in the above-mentioned electric pipe expander, a guide rod coaxial with the mandrel is arranged in the main shaft box, an axially extending guide hole is formed in the rear end of the mandrel, and at least a portion of the guide rod extends into the guide hole and is in sliding guide connection with the guide hole. The guide rod structure can improve the stability of the movement of the mandrel and ensure the pipe expansion quality.

[0018] Further, in the above-mentioned electric pipe expander, a rotating bearing is arranged between the rotating seat and the main shaft box.

[0019] As optimization, the above-mentioned electric pipe expander further includes a limiting mechanism for limiting the axial movement range of the mandrel. The limiting mechanism controls the axial movement range of the mandrel, prevents damage to the pipe to be processed or the machine shell caused by excessive forward or backward movement, and improves the safety and reliability of the equipment.

[0020] The beneficial effects of the utility model are: by directly arranging a threaded connection structure between the mandrel and the main shaft box, axial feed movement of the mandrel is realized, screw rods, flat keys and other structures are cancelled, the structure is simple, the number of parts is small, complex transmission mechanisms are avoided, the processing and manufacturing difficulty and assembly complexity are reduced, thereby the production cost is reduced; moreover, the operation is stable and reliable. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a horizontal sectional view of the pipe expander top of the utility model embodiment one.

[0022] Figure 2 It is a longitudinal sectional view of the pipe expander top of the utility model embodiment one.

[0023] Figure 3 It is a horizontal sectional view of the pipe expander top of the utility model embodiment two.

[0024] In the figure: 1, the casing; 2, main shaft box; 3, rotating seat; 31, bearing; 32, radial protrusion; 4, mandrel; 41, sliding slot; 42, guide hole; 43, expanding tube cone head; 5, motor; 61, worm; 62, worm gear; 7, nut piece; 8, guide rod; 81, guide sleeve. DETAILED DESCRIPTION

[0025] The utility model will be further described in connection with the drawings and embodiments:

[0026] In the description of the utility model, it needs to be understood that the orientation or position relationship indicated by the terms such as 'up', 'down', 'inner', 'outer', 'front', 'back' is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model, and is not indicative or suggestive of the device or element indicated must have a particular orientation, therefore it cannot be understood as a limitation on the utility model. EMBODIMENT

[0027] As shown in Figure 1 and Figure 2 , the utility model provides an electric expanding tube device, including casing 1, main shaft box 2, rotating seat 3, mandrel 4, expanding tube cone head 43 and power assembly. Wherein, power assembly includes motor 5, worm 61 and worm gear 62. Main shaft box 2 is fixedly arranged in casing 1, rotating seat 3 is rotatably arranged in main shaft box 2 through bearing 31, mandrel 4 is slidably arranged in rotating seat 3 and rotates synchronously with it, and expanding tube cone head 43 is eccentrically connected to the front end of mandrel 4.

[0028] Threaded connection structure is arranged between mandrel 4 and main shaft box 2, and the threaded connection structure includes external thread arranged on the outer circumferential surface of mandrel 4 and internal thread arranged on main shaft box 2 and matched with the external thread. Specifically, in the embodiment, a nut piece 7 is fixedly arranged in main shaft box 2, and the internal thread is arranged in the nut piece 7; the external thread is arranged on the outer circumferential surface of the opposite rear part of mandrel 4, and the front part of mandrel 4 is arranged in rotating seat 3, and the rear part passes through the nut piece 7 and is threadedly connected with it.

[0029] In order to realize the synchronous rotation and relative axial sliding of mandrel 4 and rotating seat 3, the outer wall of mandrel 4 is provided with axial sliding slot 41, and the inner wall of rotating seat 3 is provided with radial protrusion 32 matched in sliding slot 41, forming a key groove matching structure. When rotating seat 3 rotates under the driving of power assembly, mandrel 4 is driven to rotate synchronously through the cooperation of radial protrusion 32 and sliding slot 41; at the same time, due to the thread cooperation of the external thread and the internal thread of the nut piece 7, mandrel 4 moves in the axial direction during rotation.

[0030] In the power assembly, the motor 5 is arranged in the casing 1 and fixed to the main shaft box 2, the output shaft of the motor 5 is connected with the worm 61, the worm wheel 62 is fixedly connected with the rotating base 3 and engaged with the worm 61, so that the power of the motor 5 is transmitted to the rotating base 3. In the embodiment, in order to further reduce the parts, the worm wheel 62 is integrally formed with the rotating base 2.

[0031] In addition, the electric pipe expander further comprises a limiting mechanism (not shown in the figure) for limiting the axial movement range of the mandrel 4. The limiting mechanism is generally a mechanical limiting switch, which is touched when the mandrel 4 moves to the position, so as to control the motor 5 to stop, thereby preventing the mandrel 4 from moving out of range. In the specific implementation, only the front limiting switch can be arranged, only the rear limiting switch can be arranged, or the front and rear limiting switches can be arranged at the same time.

[0032] In use, the motor 5 is started, and the rotating base 3 is driven to rotate through the worm and gear transmission mechanism. The rotating base 3 drives the mandrel 4 to rotate synchronously through the key groove cooperation structure, and the mandrel 4 moves in the axial direction under the action of the threaded connection structure, so as to drive the eccentrically arranged pipe expanding cone head 43 to rotate and feed, thereby expanding the pipe. The structure is simple in design, and the number of parts is small, which not only reduces the production cost, but also improves the reliability and service life of the equipment. Embodiment

[0033] As shown in Figure 3 the embodiment, another electric pipe expander is provided, which has the same main structure as the first embodiment, and the difference lies in that: in order to further improve the stability and accuracy of the movement of the mandrel 4, the main shaft box 2 is further provided with a guide rod 8 coaxial with the mandrel 4. The rear end of the mandrel 4 is provided with an axially extending guide hole 42, and the front end of the guide rod 8 extends into the guide hole 42 and is connected in sliding guide. In the embodiment, a guide sleeve 81 is fixedly installed in the guide hole 42, the front end of the guide rod 8 extends into the inner hole of the guide sleeve 81, and the guide rod 8 is connected with the outer surface of the guide rod 8 through the sliding fit of the inner hole of the guide sleeve 81, so as to realize the guide of the axial movement of the mandrel 4. The use of the guide sleeve 81 can improve the wear resistance and service life of the guide structure, and is convenient to replace. The guide structure of the guide rod 8 and the mandrel 4 is not limited to this, and the outer surface of the guide rod 8 can directly contact and slide with the inner wall of the guide hole 42.

[0034] Finally, it can be understood that for ordinary skilled in the art, other various corresponding changes and deformations can be made according to the technical concept of the utility model, and all these changes and deformations should belong to the protection scope of the utility model claim.

Claims

1. An electric pipe expander comprising a main shaft box, a rotating seat, a mandrel, a pipe expander cone and a power assembly, the rotating seat being rotatably arranged in the main shaft box driven by the power assembly, the mandrel being slidingly arranged in the rotating seat and synchronously rotating with the rotating seat, the pipe expander cone being eccentrically connected to the front end of the mandrel, characterized in that: The threaded connection structure is arranged between the mandrel and the spindle box, and comprises an external thread arranged on the outer circumferential surface of the mandrel and an internal thread arranged on the spindle box and matched with the external thread. ​ 2. The electric pipe expander according to claim 1, characterized in that: The key groove matching structure is arranged between the mandrel and the rotating seat, so that the mandrel and the rotating seat rotate synchronously and can slide axially relative to each other.

3. The motorized pipe expander of claim 2, wherein: The outer wall of the mandrel is provided with an axial sliding groove, and the inner wall of the rotating seat is provided with a radial protrusion matched in the sliding groove, and the sliding groove and the radial protrusion constitute the key groove matching structure.

4. The motorized pipe expander of claim 1, wherein: The spindle box is internally fixed with a nut member, and the nut member is internally formed with the internal thread of the threaded connection structure.

5. The motorized pipe expander of claim 1, wherein: The power assembly comprises a motor and a worm gear and a worm engaged with each other, the worm gear is fixedly connected with the rotating seat, and the worm is connected with the motor.

6. The motorized pipe expander of claim 5, wherein: The worm gear and the rotating seat are integrally formed.

7. The power expander of claim 1, wherein: The spindle box is internally arranged with a guide rod coaxial with the mandrel, the rear end of the mandrel is provided with an axially extending guide hole, and at least a part of the guide rod extends into the guide hole and is in sliding guide connection with the guide hole.

8. The power expander of claim 1, wherein: The rotating seat and the spindle box are arranged with a rotating bearing.

9. The power expander of claim 1, wherein: The limiting mechanism for limiting the axial movement range of the mandrel is further included.

Images