A tube expansion mechanism capable of selecting tube expansion work according to the number of tube fittings

Abstract

The present invention discloses a tube expansion mechanism that can select tube expansion work according to the number of tube fittings, which includes a frame, at least two hollow expansion rods are arranged on the frame, each expansion rod is provided with a core rod, the left end of the expansion rod is provided with an expansion head, the left end of the core rod is provided with a core head that can expand the expansion head when the core rod moves to the right, a moving seat is arranged on the right side of the frame, the moving seat is driven by a main driver and can move left and right, the right end of the core rod extends from the expansion rod and extends to the moving seat, each core rod and the moving seat are provided with a connecting piece that can connect the two, when the connecting piece is in the working position, the corresponding core rod is connected to the moving seat, when the connecting piece is in the non-working position, the corresponding core rod is separated from the moving seat, each connecting piece is driven by a secondary driver and can be switched between the working position and the non-working position. The present invention can selectively expand the tube fittings of each station according to needs to avoid repeated tube expansion.

Description

Technical Field

[0001] The invention relates to the technical field of tube expansion, in particular to a tube expansion mechanism applied to a tube expander and capable of selecting tube expansion work according to the number of tubes. Background Art

[0002] Traditional tube expanders generally use a direct push method to expand the tube, that is, the expansion head enters from one end of the copper tube and forces the copper tube to expand through the action of the expansion head. This process is suitable for the production of heat exchangers with a small variety and large batches. However, when facing the production of heat exchangers with a large variety and small batches, if the existing production method is used, it is necessary to replace the expansion rod, expansion head and U-support, especially each variety needs to be equipped with a corresponding U-support, which leads to high production costs, inflexible production and other disadvantages.

[0003] In order to solve the above problems, the invention patent with application number 201510412617.9 discloses a tube expansion device with an expansion head structure and its application. In the tube expansion device, the outer diameter of the expansion head is variable, which can adapt to the production requirements of heat exchangers with various specifications. The working principle of the tube expansion is: the same tube expansion mechanism pulls all the core rods to move axially together. During the movement of the core rod, the hollow expansion rod will expand, and finally the pipe fittings on the outside of the expansion rod will also expand. Such a tube expansion machine also has some problems. Since the feeding of the pipe fittings is automatic, the number of pipe fittings fed each time is equal to the number of expansion rods. When the number of pipe fittings is not equal to the multiple of the expansion rods, for example, the number of expansion rods is 3 and the number of pipe fittings is 7, then when the third feeding is performed, the 5th to 7th pipe fittings will be fed to the tube expansion machine. At this time, the 5th and 6th pipe fittings are expanded for the second time, resulting in problems such as the pipe fittings being damaged by expansion. Summary of the invention

[0004] In view of this, an object of the present invention is to provide a tube expansion mechanism which can select the expansion rod to work according to the number of tubes and avoid repeated tube expansion.

[0005] The technical solution adopted by the present invention to solve the technical problem is:

[0006] A tube expansion mechanism that can select tube expansion work according to the number of tube fittings, comprising a frame, at least two hollow expansion rods are arranged on the frame, each expansion rod is provided with a core rod that can move axially relative to the expansion rod, the left end of the expansion rod is provided with an expansion head, the left end of the core rod is provided with a core head that can expand the expansion head when the core rod moves to the right, a moving seat is arranged on the right side of the frame, the moving seat is driven by a main drive and can move left and right, the right end of the core rod extends from the expansion rod and extends to the moving seat, each core rod and the moving seat are provided with a connecting piece that can connect the two, when the connecting piece is in the working position, the corresponding core rod is connected to the moving seat, when the connecting piece is in the non-working position, the corresponding core rod is separated from the moving seat, each connecting piece is driven by a secondary drive and can switch between the working position and the non-working position.

[0007] Preferably, the right side of the movable seat has a push-up surface, the core rod is provided with a first limit block located on the right side of the push-up surface, and the connecting member is a movable pad that can be inserted into and withdrawn from the space between the first limit block and the push-up surface.

[0008] Preferably, the thickness of the movable pad is greater than the stroke of the expansion rod during the tube expansion operation.

[0009] Preferably, the insertion end of the movable pad is provided with a U-shaped notch that cooperates with the expansion rod.

[0010] Preferably, the lower end of the movable pad is an insertion end, and the insertion end has a plug portion, and the thickness of the plug portion is smaller than the thickness of the middle portion of the movable pad.

[0011] Preferably, the auxiliary driver is a cylinder capable of driving the movable pad to move up and down.

[0012] Preferably, the frame includes an expansion rod bracket and a base, the base is spaced a certain distance from the movable seat and the spacing space forms a wedge-shaped groove, the wedge-shaped groove is arranged along the front-to-back direction or the up-and-down direction, and a wedge-shaped pushing piece that cooperates with the wedge-shaped groove is arranged in the wedge-shaped groove, and the output end of the main drive is connected to the wedge-shaped pushing piece to drive the wedge-shaped pushing piece to move along the wedge groove.

[0013] Preferably, guide members are provided on both side walls of the wedge-shaped groove, and sliding seats cooperating with the guide members are provided on both sides of the wedge-shaped ejecting member.

[0014] The beneficial effect of the present invention is as follows: taking the number of expansion rods as 3 and the number of pipe fittings as 7 as an example, the working principle of the present invention is as follows: during the first and second expansion operations, the three connecting parts are all in the working position, so that all the core rods are connected to the movable seat, and then the main driver drives the movable seat to move to the right, and all the expansion heads are expanded by the pressure of the core heads, and all the pipe fittings are expanded. Two expansion operations can expand 6 pipes; during the third expansion operation, two of the connecting parts move to the non-working position, so that the corresponding two core rods are separated from the movable seat. When the movable seat moves to the right, only one of the core rods is pulled to move to the right, so that only the 7th pipe fitting can be expanded, thereby avoiding repeated expansion. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a top view of the present invention;

[0016] Figure 2 It is a front view of the present invention;

[0017] Figure 3 yes Figure 2 A magnified view of part A;

[0018] Figure 4 It is the right side view of the pad;

[0019] Figure 5 It is a structural diagram of the expansion rod and the left end of the core rod. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings.

[0021] Reference Figures 1 to 5 The embodiment of the present invention proposes a tube expansion mechanism that can select tube expansion work according to the number of tube fittings, which includes a frame 1, at least two hollow expansion rods 2 are arranged on the frame 1, the expansion rods 2 are placed along the left and right directions, each expansion rod 2 is provided with a core rod 3 that can move relative to its axial direction, the left end of the expansion rod 2 is provided with an expansion head 21, the left end of the core rod 3 is provided with a core head 300 that can expand the expansion head 21 when the core rod 3 moves to the right, a moving seat 4 is arranged on the right side of the frame 1, and the moving seat 4 is driven by a main driver 6 and can move left and right, the right end of the core rod 3 extends from the expansion rod 2 and extends to the moving seat 4, each core rod 3 and the moving seat 4 are provided with a connecting piece that can connect the two, when the connecting piece is in the working position, the corresponding core rod 3 is connected to the moving seat 4, when the connecting piece is in the non-working position, the corresponding core rod 3 is separated from the moving seat 4, and each connecting piece is driven by an independent auxiliary driver 52 and can switch between the working position and the non-working position.

[0022] Taking the case where the number of expansion rods 2 is 3 and the number of pipe fittings is 7 as an example, the working principle of the present invention is: during the first and second expansion operations, the three connecting parts are in the working position, so that all the core rods 3 are connected to the movable seat 4, and then the main driver 6 drives the movable seat 4 to move to the right, and all the expansion heads 21 are expanded by the pressure of the core head 300, and all the pipe fittings are expanded. Two expansion operations can expand 6 pipes; during the third expansion operation, two of the connecting parts move to the non-working position, so that the corresponding two core rods 3 are separated from the movable seat 4. When the movable seat 4 moves to the right, only one of the core rods 3 is pulled to move to the right, so that only the 7th pipe fitting can be expanded, thereby avoiding repeated expansion.

[0023] Reference Figure 3 In one embodiment of the present invention, the right side of the movable seat 4 has a push-up surface 41, the core rod 3 is provided with a first limit block 31 located on the right side of the push-up surface 41, and the connecting piece is a movable pad 51 that can be inserted into and withdrawn from the space between the first limit block 31 and the push-up surface 41. The movable seat 4 is provided with a guide hole that can be guided left and right, each core rod 3 passes through the corresponding guide hole and slides with the movable seat 4, and the core rod 3 is also provided with a second limit block 32 that can abut against the left side of the movable seat 4. The thickness of the movable pad 51 should be greater than the stroke of the expansion rod 2 during the expansion operation. When the movable pad 51 is inserted between the first limit block 31 and the push-up surface 41, the movable pad 51 abuts against the first limit block 31. When the movable seat 4 moves to the right, the corresponding core rod 3 can be driven to move to the right, so that the expansion head 21 expands. When the movable seat 4 moves to the left, the movable seat 4 presses the second limit block 32, which can drive the core rod 3 to move left, so that the expansion head 21 returns to its original state. The movable pad 51 can be designed to be movable or swingable, preferably movable up and down. In some embodiments of the present invention, the above-mentioned connecting member can also be a pin set on the movable seat 4, and a positioning hole matching the pin is set on the core rod 3. The pin is driven to insert or withdraw from the positioning hole by the auxiliary driver 52 to connect or disconnect the core rod 3 and the movable seat 4.

[0024] Reference Figure 4 Furthermore, the insertion end of the movable pad 51 is provided with a U-shaped notch 512 that cooperates with the expansion rod 2. Such a design can increase the contact area between the movable pad 51 and the first limit block 31, so that the first limit block 31 is evenly stressed.

[0025] Reference Figure 3 The lower end of the movable pad 51 is an insertion end, and the insertion end has a plug portion 511. The thickness of the plug portion 511 is less than the thickness of the middle portion of the movable pad 51. The thickness of the pad mentioned above also refers to the thickness of the middle portion of the pad. The small thickness of the plug portion 511 facilitates the insertion of the movable pad 51 between the first limit block 31 and the push-up surface 41.

[0026] Optionally, the auxiliary driver 52 is a cylinder capable of driving the movable pad 51 to move up and down so that the movable pad 51 is inserted into or withdrawn from the space between the first limit block 31 and the push-up surface 41. The cylinder is used to conveniently control whether it is working.

[0027] Reference Figure 1 The frame 1 includes an expansion rod support 11 and a base 12. The base 12 is spaced a certain distance from the moving seat 4 and the space forms a wedge-shaped groove 7. The wedge-shaped groove 7 is arranged along the front-back direction or the up-down direction. A wedge-shaped push piece 8 matching the wedge-shaped groove 7 is arranged in the wedge-shaped groove 7. The output end of the main driver 6 is connected to the wedge-shaped push piece 8 to drive the wedge-shaped push piece 8 to move along the wedge-shaped groove 7. When the wedge-shaped push piece 8 moves, it drives the moving seat 4 to move forward and backward to perform the tube expansion operation. Preferably, the main driver 6 is a cylinder.

[0028] In order to improve the smoothness of the action, guide members 91 are provided on both side walls of the wedge-shaped groove 7, and slide seats 81 matched with the guide members 91 are provided on both sides of the wedge-shaped push-out member 8. Preferably, the guide member 91 is a T-shaped guide rail.

[0029] The angle between the two guide rails is generally designed to be less than 20 degrees, so that the wedge-shaped push member 8 has a force-increasing effect when pushing the moving seat 4 to move, which is beneficial to energy saving.

[0030] The above are only preferred implementation modes of the present invention. Any technical solution that achieves the purpose of the present invention by substantially the same means shall fall within the protection scope of the present invention.

Claims

1. A tube expansion mechanism capable of selecting a tube expansion operation according to the number of tube fittings, comprising a frame (1), the frame (1) being provided with at least two hollow expansion rods (2), each expansion rod (2) being provided with a core rod (3) that can move relative to its axial direction, the left end of the expansion rod (2) being provided with an expansion head (21), the left end of the core rod (3) being provided with a core head (300) that can expand the expansion head (21) when the core rod (3) moves to the right, the right side of the frame (1) being provided with a movable seat (4), the movable seat (4) being driven by a main drive (6) and being movable leftward and rightward, characterized in that: The right end of the core rod (3) extends out of the expansion rod (2) and extends to the movable seat (4). A connecting piece capable of connecting the two is provided between each core rod (3) and the movable seat (4). When the connecting piece is in a working position, the corresponding core rod (3) is connected to the movable seat (4). When the connecting piece is in a non-working position, the corresponding core rod (3) is disconnected from the movable seat (4). Each connecting piece is driven by a secondary driver (52) and can be switched between a working position and a non-working position. The right side of the movable seat (4) is provided with a push-up surface (41), the core rod (3) is provided with a first limit block (31) located on the right side of the push-up surface (41), and the connecting member is a movable pad (51) capable of being inserted into and withdrawn from the space between the first limit block (31) and the push-up surface (41); The frame (1) comprises an expansion rod support (11) and a base (12); the base (12) is spaced a certain distance from the movable seat (4) and a wedge-shaped groove (7) is formed therebetween; the wedge-shaped groove (7) is arranged along a front-to-rear direction or an up-down direction; a wedge-shaped push-out member (8) cooperating with the wedge-shaped groove (7) is arranged in the wedge-shaped groove (7); an output end of the main driver (6) is connected to the wedge-shaped push-out member (8) to drive the wedge-shaped push-out member (8) to move along the wedge-shaped groove (7).

2. A tube expansion mechanism capable of selecting tube expansion work according to the number of tubes according to claim 1, characterized in that: The thickness of the movable pad (51) is greater than the stroke of the expansion rod (2) during the tube expansion operation.

3. The tube expansion mechanism capable of selecting the tube expansion operation according to the number of tubes according to claim 1, characterized in that: The insertion end of the movable pad (51) is provided with a U-shaped notch (512) that cooperates with the expansion rod (2).

4. The tube expansion mechanism capable of selecting the tube expansion operation according to the number of tubes according to claim 1, characterized in that: The lower end of the movable pad (51) is an insertion end, and the insertion end has a plug portion (511). The thickness of the plug portion (511) is smaller than the thickness of the middle portion of the movable pad (51).

5. The tube expansion mechanism capable of selecting the tube expansion operation according to the number of tubes according to claim 1, characterized in that: The auxiliary driver (52) is a cylinder capable of driving the movable pad (51) to move up and down.

6. The tube expansion mechanism capable of selecting the tube expansion operation according to the number of tubes according to claim 1, characterized in that: Guide members (91) are provided on both side walls of the wedge-shaped groove, and slide seats (81) cooperating with the guide members (91) are provided on both sides of the wedge-shaped push-up member (8).

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