Threaded push type pipe expander

Abstract

The utility model discloses a threaded push type pipe expander, and belongs to the technical field of pipe expanders, the threaded push type pipe expander comprises an expansion rod, the expansion rod is sleeved with an expansion pipe and an expansion shell, the expansion pipe is provided with a plurality of expansion shell grooves, the expansion shell grooves are arranged at equal intervals in the circumferential direction of the expansion pipe, expanders are arranged in the expansion shell grooves in a sliding mode, and a connecting pipe is arranged at the end, away from the expansion pipe, of the expansion shell; the expansion rod is sleeved with the connecting pipe, the connecting pipe is in threaded connection with the expansion rod, and a connecting piece used for being fixedly connected with the expansion pipe is arranged on the connecting pipe. The pipe expander has the effect of reducing the use cost of the pipe expander.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tube expanders, and particularly relates to a threaded push type tube expander. BACKGROUND

[0002] At present, most of the mechanical tube expanders used for connecting the tube plate of a heat exchanger and heat exchange tubes have an inclination between the expansion shell groove and the expansion shell axis, the expander is installed in the expansion shell groove, the expander axis and the expansion rod axis intersect in space. When the expansion rod rotates, the expansion rod and the expander conical surface are in contact, the expander is driven to rotate around its axis, and the expander also pushes the expansion rod to move axially. When the expansion rod is pushed forward, the diameter of the expander outer circle gradually expands to complete the expansion.

[0003] A threaded push type parallel head tube expander is disclosed in Chinese Utility Model Patent No. CN203843028U, which is composed of an expansion shell, an expander and an expansion rod. The expansion shell is in a stepped cylindrical shape, and the inner cavity is a through hole with different diameters. Long hole-shaped expansion shell grooves are distributed at equal angles in the front section of the expansion shell, and the two sides of the expansion shell groove have an inside-outside angle. The expander is in a conical column shape and is assembled in the expansion shell groove. The front section of the expansion rod is in a conical column shape, the expansion rod is inserted into the expansion shell cylinder, the taper direction of the expansion rod is opposite to that of the expander, there is an internal thread in the rear part of the expansion shell, and there is an external thread in the rear part of the expansion rod. The external thread of the expansion rod is matched with the internal thread in the rear part of the expansion shell. The expansion shell groove and the expansion shell axis have no inclination, and the expander axis and the expansion rod axis have no space intersection angle.

[0004] In the above related technology, when the expansion rod is rotated, the expansion rod is moved forward under the condition of thread cooperation, the expansion rod pushes the expander to move, and the expander completes the expansion. Since the expansion rod and the expansion shell are connected through threads, the internal thread on the inner periphery of the expansion shell is prone to wear and damage during long-term use, and the expansion shell needs to be replaced as a whole, thereby increasing the use cost of the tube expander. CONTENT

[0005] In order to improve the problem that the internal thread on the inner periphery of the expansion shell is prone to wear and damage during long-term use, and the expansion shell needs to be replaced as a whole, thereby increasing the use cost of the tube expander, the present application provides a threaded push type tube expander.

[0006] The threaded push type tube expander provided by the present application adopts the following technical scheme:

[0007] The threaded push type tube expander comprises an expansion rod, an expansion tube and an expansion shell, the expansion tube is sleeved on the expansion rod, a plurality of expansion shell grooves are formed in the expansion tube, the plurality of expansion shell grooves are arranged at equal intervals along the circumference of the expansion tube, an expander is slidably arranged in the expansion shell groove, a connecting pipe is arranged at the end of the expansion shell away from the expansion tube, the connecting pipe is sleeved on the expansion rod, the connecting pipe is threadedly connected with the expansion rod, and a connecting piece for fixedly connecting with the expansion tube is arranged on the connecting pipe.

[0008] By adopting the technical scheme, when the expanding rod is rotated, the expanding rod pushes the expander to move, the circumscribed circle of the expander is expanded, and the expansion is realized; when the pipe expander is used for a long time, the internal thread on the inner periphery of the connecting pipe is damaged, the connecting piece on the connecting pipe is disassembled from the expansion shell, a new connecting pipe is replaced, the replacement of the entire expansion shell is reduced, and thus the use cost of the pipe expander is reduced.

[0009] Preferably, the thread on the outer periphery of the expanding rod is a trapezoidal thread, and the thread groove on the inner periphery of the connecting pipe is a trapezoidal thread groove.

[0010] By adopting the technical scheme, the thread on the outer periphery of the expanding rod is designed as a trapezoidal thread, and the thread groove on the inner periphery of the connecting pipe is designed as a trapezoidal thread groove, so that the wear resistance of the thread is improved, and thus the service life of the connecting pipe is improved.

[0011] Preferably, the connecting piece includes a circular ring fixed to the connecting pipe near the pipe expansion end face, an annular groove is formed in the inner periphery of the expansion shell, the annular groove penetrates through the end face of the expansion shell away from the pipe expansion, the circular ring is inserted into the annular groove, a plurality of through holes are formed in the inner periphery of the annular groove, a plurality of circular holes are formed in the outer periphery of the circular ring, the plurality of circular holes correspond to the plurality of through holes, a bolt is inserted into the through hole, the bolt is inserted into the circular hole through the through hole, and the bolt is threadedly connected with the inner wall of the circular hole.

[0012] By adopting the technical scheme, the circular ring on the connecting pipe is inserted into the annular groove, the circular hole is aligned with the through hole by rotating the connecting pipe, and then the bolt is inserted into the circular hole through the through hole, so that the connecting pipe and the expansion shell are fixedly connected.

[0013] Preferably, an inner hexagonal hole is formed in the end face of the bolt away from the central axis of the expanding rod.

[0014] By adopting the technical scheme, when the bolt is inserted into the circular hole through the through hole, the inner hexagonal wrench is inserted into the inner hexagonal hole, the inner hexagonal wrench is rotated, the inner hexagonal wrench drives the bolt to rotate, and thus the bolt is conveniently screwed into the circular hole.

[0015] Preferably, the connecting piece includes a plurality of insertion columns fixed to the connecting pipe near the end face of the expansion shell, the plurality of insertion columns are equidistantly arranged along the circumference of the connecting pipe, one side surface of the insertion column is fixed with a clamping block, an end face of the expansion shell near the connecting pipe is provided with a plurality of insertion grooves, the plurality of insertion grooves correspond to the plurality of insertion columns, the insertion column is inserted into the insertion groove, one inner side surface of the insertion groove is provided with a clamping groove, the clamping block is inserted into the clamping groove, and the insertion groove is provided with a fixing piece for fixing the insertion column.

[0016] By adopting the technical scheme, the clamping block and the inserting column on the connecting pipe are aligned with the inserting slot on the bulging shell, the connecting pipe is moved towards the bulging shell, the inserting column and the clamping block are inserted into the inserting slot, then the connecting pipe is rotated, the clamping block is moved into the clamping slot, and then the inserting column is fixed in the inserting slot by the fixing member, so that the connecting pipe is fixedly connected with the bulging shell.

[0017] Preferably, a sliding slot is formed in the inner side of the inserting slot away from the connecting pipe, a fixing block is slidably arranged in the sliding slot, a spring is fixed to the end of the fixing block away from the connecting pipe, and the end of the spring away from the fixing block is fixed to the inner side of the sliding slot away from the connecting pipe.

[0018] By adopting the technical scheme, the clamping block and the inserting column on the connecting pipe are aligned with the inserting slot on the bulging shell, the connecting pipe is moved towards the bulging shell, the inserting column and the clamping block are inserted into the inserting slot, the inserting column abuts against the fixing block, the inserting column pushes the fixing block into the sliding slot, then the connecting pipe is rotated, the clamping block is moved into the clamping slot, the inserting column is separated from the fixing block, the fixing block is moved towards the connecting pipe under the elastic force of the spring, the side of the fixing block opposite to the inserting column abuts against the inserting column, and thus the inserting column is fixed in the inserting slot.

[0019] Preferably, a through hole is formed in the inner periphery of the inserting slot, and a moving rod is fixed to the side of the fixing block away from the central axis of the bulging shell, and the end of the moving rod away from the fixing block penetrates through the through hole.

[0020] By adopting the technical scheme, when the connecting pipe needs to be detached from the bulging shell, the moving rod is moved away from the connecting pipe, the fixing block is moved by the moving rod, the fixing block is moved into the sliding slot, the connecting pipe is reversely rotated, the clamping block is moved out of the clamping slot, and then the connecting pipe is moved away from the bulging shell, so that the connecting pipe is detached from the bulging shell.

[0021] Preferably, a moving ring is sleeved on the outer periphery of the bulging shell, and the end of the moving rod away from the fixing block is fixed to the inner periphery of the moving ring.

[0022] By adopting the technical scheme, when the connecting pipe needs to be detached from the bulging shell, the moving ring is moved away from the connecting pipe, so that the plurality of moving rods are simultaneously moved.

[0023] In summary, the present application has at least one of the following beneficial technical effects:

[0024] 1. When the expansion rod is rotated, the expansion rod pushes the expander to move, the expander's circumcircle is expanded to realize expansion, when the pipe expander is used for a long time, the internal thread on the inner periphery of the connecting pipe is damaged, the connecting pipe is disassembled from the expansion shell, a new connecting pipe is replaced, the replacement of the entire expansion shell is reduced, and the use cost of the pipe expander is reduced;

[0025] 2. The connecting pipe is moved towards the expansion shell, the insertion column and the clamping block are inserted into the insertion slot, then the connecting pipe is rotated, the clamping block is moved into the clamping slot, then the insertion column is fixed in the insertion slot through the fixing piece, so that the connecting pipe is fixedly connected with the expansion shell;

[0026] 3. The connecting pipe is moved towards the expansion shell, the insertion column and the clamping block are inserted into the insertion slot, the insertion column abuts against the fixed block, the insertion column pushes the fixed block into the sliding groove, then the connecting pipe is rotated, the clamping block is moved into the clamping slot, the insertion column is separated from the fixed block, the fixed block is moved towards the connecting pipe under the elastic force of the spring, and the side surface of the fixed block opposite to the insertion column abuts against each other, so that the insertion column is fixed in the insertion slot. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is the overall structure schematic diagram of the threaded push type pipe expander of the embodiment 1 of the application.

[0028] Figure 2 It is the sectional view of the expansion shell in the embodiment 1 of the application.

[0029] Figure 3 It is the overall structure schematic diagram of the threaded push type pipe expander of the embodiment 2 of the application.

[0030] Figure 4 It is the structure schematic diagram of the connecting pipe in the embodiment 2 of the application.

[0031] Figure 5 It is the structure schematic diagram of the expansion shell in the embodiment 2 of the application.

[0032] Figure 6 It is the sectional view of the expansion shell in the embodiment 2 of the application.

[0033] Reference signs: 1, expansion rod; 11, pipe expansion; 12, expansion shell slot; 13, expander; 14, expansion shell; 2, connecting pipe; 21, circular ring; 22, annular groove; 23, through hole; 24, circular hole; 25, latch; 26, internal hexagonal hole; 3, insertion column; 31, clamping block; 32, insertion slot; 33, clamping slot; 34, sliding groove; 35, fixed block; 36, spring; 37, through opening; 38, moving rod; 39, moving ring. DETAILED DESCRIPTION

[0034] The application will be further described below in conjunction with the accompanying drawings. Figures 1-6 The application will be further described below in conjunction with the accompanying drawings.

[0035] The application discloses a threaded advancing type pipe expander.

[0036] Embodiment 1

[0037] With reference to Figure 1 The threaded advancing type pipe expander comprises an expander rod 1, an expander pipe 11 and an expander shell 14 which are sleeved on the expander rod 1, a plurality of expander shell grooves 12 are formed in the expander pipe 11, the expander shell grooves 12 are long hole-shaped, and the plurality of expander shell grooves 12 are arranged at equal intervals along the circumferential direction of the expander pipe 11. An expander plug 13 is arranged in the expander shell groove 12 and slides along the radial direction of the expander pipe 11, and the taper direction of the expander plug 13 is opposite to the taper direction of the expander rod 1. The end of the expander shell 14 away from the expander pipe 11 is provided with a connecting pipe 2, the inner diameter of the connecting pipe 2 is smaller than the inner diameter of the expander shell 14, the connecting pipe 2 is sleeved on the expander rod 1, a trapezoidal thread groove is formed in the inner circumferential surface of the connecting pipe 2, and a trapezoidal thread is formed in the outer circumferential surface of the expander rod 1, which is matched with the trapezoidal thread groove.

[0038] With reference to Figure 1 And Figure 2 The end face of the connecting pipe 2 close to the expander shell 14 is integrally formed with a circular ring 21, and the inner circumferential surface of the circular ring 21 is coplanar with the inner circumferential surface of the connecting pipe 2. An annular groove 22 is formed in the inner circumferential surface of the expander shell 14, and the annular groove 22 penetrates the end face of the expander shell 14 away from the expander pipe 11. The circular ring 21 is inserted into the annular groove 22, a plurality of through holes 23 are formed in the inner circumferential surface of the annular groove 22 and arranged at equal intervals along the circumferential direction of the expander shell 14, a plurality of circular holes 24 are formed in the outer circumferential surface of the circular ring 21 and correspond to the plurality of through holes 23. A plug pin 25 is inserted into the circular hole 24, one end of the plug pin 25 close to the central axis of the expander shell 14 is inserted into the circular hole 24, the plug pin 25 is threadedly connected with the inner wall of the circular hole 24, and an inner hexagonal hole 26 is formed in the end of the plug pin 25 away from the circular ring 21.

[0039] The implementation principle of embodiment 1 is that the circular ring 21 on the connecting pipe 2 is inserted into the annular groove 22 on the expander shell 14, then the circular hole 24 on the circular ring 21 is aligned with the through hole 23 on the expander shell 14, the plug pin 25 is inserted into the circular hole 24 through the through hole 23, then a hexagonal wrench is inserted into the inner hexagonal hole 26, the hexagonal wrench is rotated to drive the plug pin 25 to rotate, the plug pin 25 is screwed into the circular hole 24, and the connecting pipe 2 and the expander shell 14 are fixedly connected. When the thread on the inner circumferential surface of the connecting pipe 2 is damaged due to long-time use of the threaded advancing type pipe expander, the connecting pipe 2 can be replaced by being disassembled, so that the use cost of the pipe expander is reduced.

[0040] Embodiment 2

[0041] With reference to Figure 3 , Figure 4 and Figure 5 , the embodiment differs from embodiment 1 in that the connecting pipe 2 is fixed with a plurality of insertion posts 3 on the end face close to the expansion shell 14, and the plurality of insertion posts 3 are equidistantly arranged along the circumference of the connecting pipe 2. One side of the insertion post 3 is integrally formed with a clamping block 31, and the end face of the expansion shell 14 close to the connecting pipe 2 is provided with a plurality of insertion slots 32 corresponding to the plurality of insertion posts 3, and the insertion post 3 can be inserted into the insertion slot 32. One inner side of the insertion slot 32 is provided with a clamping groove 33, and the clamping block 31 is inserted into the clamping groove 33.

[0042] With reference to Figure 4 , Figure 5 and Figure 6 , the inner side of the insertion slot 32 away from the connecting pipe 2 is provided with a sliding groove 34, and one inner side of the sliding groove 34 is coplanar with the inner side of the insertion slot 32. A fixing block 35 is slidingly arranged in the sliding groove 34, and the side of the fixing block 35 opposite to the insertion post 3 abuts. The fixing block 35 is fixed with a spring 36 away from the end face of the connecting pipe 2, and one end of the spring 36 away from the fixing block 35 is fixed to the inner side of the sliding groove 34 away from the connecting pipe 2. The side of the sliding groove 34 away from the central axis of the expansion shell 14 is provided with a through hole 37, and the top surface of the fixing block 35 is fixed with a moving rod 38, and one end of the moving rod 38 away from the fixing block 35 passes through the through hole 37. The outer circumferential surface of the expansion shell 14 is sleeved with a moving ring 39, and one end of the moving rod 38 away from the fixing block 35 is fixed to the inner circumferential surface of the moving ring 39.

[0043] The implementation principle of embodiment 2 is that the clamping block 31 and the insertion post 3 on the connecting pipe 2 are aligned with the insertion slot 32 on the expansion shell 14, the connecting pipe 2 is moved towards the direction close to the expansion shell 14, the insertion post 3 pushes the fixing block 35 to move into the sliding groove 34, at this time the insertion post 3 and the clamping block 31 move into the insertion slot 32, then the connecting pipe 2 is rotated, the clamping block 31 moves into the clamping groove 33, and the insertion post 3 is separated from the fixing block 35, then the fixing block 35 moves towards the direction close to the connecting pipe 2 under the elastic force of the spring 36, so that the side of the fixing block 35 opposite to the insertion post 3 abuts, thereby fixing and connecting the connecting pipe 2 and the expansion shell 14.

[0044] The above are preferred embodiments of the present application, which do not limit the protection scope of the present application, therefore: any equivalent changes made on the structure, shape, principle of the present application shall be covered within the protection scope of the present application.

Claims

1. A threaded push-type tube expander, characterized in that: The device includes an expansion rod (1), an expansion tube (11) and an expansion shell (14) sleeved on the expansion rod (1). The expansion tube (11) has multiple expansion shell grooves (12) at equal intervals along the circumference of the expansion tube (11). An expansion element (13) is slidably disposed in the expansion shell groove (12). A connecting tube (2) is provided at one end of the expansion shell (14) away from the expansion tube (11). The connecting tube (2) is sleeved on the expansion rod (1) and threadedly connected to the expansion rod (1). A connecting member for fixed connection with the expansion tube (11) is provided on the connecting tube (2).

2. The threaded push-type tube expander according to claim 1, characterized in that: The thread on the outer circumference of the expansion rod (1) is a trapezoidal thread, and the thread groove on the inner circumference of the connecting pipe (2) is a trapezoidal thread groove.

3. A threaded push-type tube expander according to claim 1, characterized in that: The connector includes a ring (21) fixed to the end face of the connecting tube (2) near the expansion tube (11). The inner circumferential surface of the expansion shell (14) is provided with an annular groove (22). The annular groove (22) penetrates the end face of the expansion shell (14) away from the expansion tube (11). The ring (21) is inserted into the annular groove (22). The inner circumferential surface of the annular groove (22) is provided with multiple through holes (23). The outer circumferential surface of the ring (21) is provided with multiple round holes (24). The multiple round holes (24) correspond to the multiple through holes (23). A pin (25) is inserted into the through hole (23). The pin (25) passes through the through hole (23) and is inserted into the round hole (24). The pin (25) is threaded to the inner wall of the round hole (24).

4. A threaded push-type tube expander according to claim 3, characterized in that: The end face of the pin (25) away from the central axis of the expansion rod (1) has an internal hexagonal hole (26).

5. A threaded push-type tube expander according to claim 3, characterized in that: The connector includes a plurality of plug-in pins (3) fixed to the end face of the connecting pipe (2) near the expansion shell (14). The plurality of plug-in pins (3) are evenly spaced along the circumference of the connecting pipe (2). A locking block (31) is fixed to one side of each plug-in pin (3). The end face of the expansion shell (14) near the connecting pipe (2) is provided with a plurality of plug-in slots (32). The plurality of plug-in slots (32) correspond to the plurality of plug-in pins (3). The plug-in pins (3) are inserted into the plug-in slots (32). A locking groove (33) is provided on one inner side of the plug-in slots (32). The locking block (31) is inserted into the locking groove (33). A fixing member for fixing the plug-in pins (3) is provided in the plug-in slots (32).

6. A threaded push-type tube expander according to claim 5, characterized in that: The inner side of the insertion slot (32) away from the connecting pipe (2) is provided with a sliding groove (34). A fixing block (35) is slidably arranged in the sliding groove (34). A spring (36) is fixed to the end face of the fixing block (35) away from the connecting pipe (2). One end of the spring (36) away from the fixing block (35) is fixed to the inner side of the sliding groove (34) away from the connecting pipe (2). The fixing block (35) abuts against the side of the insertion post (3).

7. A threaded push-type tube expander according to claim 6, characterized in that: The inner circumferential surface of the insertion groove (32) is provided with an opening (37), and a moving rod (38) is fixed on the side of the fixing block (35) away from the central axis of the expansion shell (14). One end of the moving rod (38) away from the fixing block (35) passes through the opening (37).

8. A threaded push-type tube expander according to claim 7, characterized in that: The outer circumferential surface of the expansion shell (14) is fitted with a movable ring (39), and one end of the movable rod (38) away from the fixed block (35) is fixed to the inner circumferential surface of the movable ring (39).

Images