Pipe expander

Abstract

The utility model discloses and provides a pipe expander which comprises a machine frame, a hydraulic cylinder is arranged in the machine frame, a piston of the hydraulic cylinder is fixedly connected with a pipe expanding head, an opening is formed in the position, corresponding to the pipe expanding head, of the surface of the machine frame, a pipe expanding die is fixedly connected to the opening, and the pipe expanding die is fixedly connected with the hydraulic cylinder. The pipe expanding head is in transmission connection with the pipe expanding die, the hydraulic cylinder is fixedly connected with a measuring instrument, an output shaft of the measuring instrument is fixedly connected with the pipe expanding head, and the measuring instrument is in signal connection with the hydraulic cylinder. Formation of the hydraulic cylinder is detected through the measuring instrument, so that the flaring diameter of a pipe fitting is accurately controlled, a worker only needs to sleeve the pipe fitting on the pipe expanding die, the hydraulic cylinder drives the pipe expanding head to enable the pipe expanding die to be expanded to expand a pipe opening, the automation degree is high, precision is high, and errors are small.

Description

Technical Field

[0001] The present disclosure relates to the technical field of pipe fitting processing equipment, and in particular to a tube expanding machine. Background Art

[0002] Equipment for expanding the ends of pipe fittings is usually referred to as a tube expanding machine or a flaring machine. These devices are mainly used to expand the diameter of the ends or specific parts of pipe fittings (such as steel pipes, copper pipes, stainless steel pipes, etc.) through physical or mechanical methods so that two pipe fittings can be butted. Tube expanding machines or flaring machines are widely used in the fields of manufacturing, construction, petrochemical industry, aerospace, etc. Especially when it is necessary to connect pipe fittings or make pipe fittings with special shapes, these devices play an important role.

[0003] The existing tube expanding machines have low automation and require manual control to expand the diameter, resulting in inaccurate flaring diameters, which causes the pipe fittings to be unable to be inserted or be too loose when butting. Summary of the Utility Model

[0004] The present disclosure provides a tube expanding machine to solve one of the technical problems recognized by the inventors.

[0005] The present disclosure provides a tube expanding machine, including a frame. A hydraulic cylinder is arranged inside the frame. A piston of the hydraulic cylinder is fixedly connected with a tube expanding head. An opening is formed in a position on the surface of the frame corresponding to the tube expanding head. A tube expanding die is fixedly connected at the opening. The tube expanding head is in transmission connection with the tube expanding die. The hydraulic cylinder is fixedly connected with a measuring instrument. An output shaft of the measuring instrument is fixedly connected with the tube expanding head. The measuring instrument is in signal connection with the hydraulic cylinder.

[0006] Preferably, the tube expanding die includes a fixed pressing plate. A plurality of tube expanding blocks are movably connected inside the fixed pressing plate. The plurality of tube expanding blocks are distributed in a circumferential array. The tube expanding head penetrates through the middle parts of the plurality of tube expanding blocks.

[0007] Preferably, an activity groove is formed inside the fixed pressing plate. One end of the tube expanding block is embedded in the activity groove. A mounting groove is formed on a side surface of the tube expanding block. A pin is embedded in the mounting groove. The pin is connected with the tube expanding block.

[0008] Preferably, a pressing block is fixedly connected at a position inside the frame corresponding to the opening. The pressing block is fixedly connected with the fixed pressing plate. A guiding block is arranged at a position on the pressing block corresponding to the tube expanding block. A guiding groove is formed at a position on the end of the tube expanding block corresponding to the guiding block. The guiding block is embedded in the guiding groove and is in clearance fit with the guiding groove.

[0009] Preferably, at least one spring installation groove is respectively formed at both ends of the outer side of the expanding tube block, and a reset spring is respectively sleeved outside the spring installation grooves of the plurality of expanding tube blocks.

[0010] Preferably, an arc-shaped backing plate is detachably connected to the outer side of the expanding tube block.

[0011] Preferably, the diameter of the expanding tube head gradually decreases from the end close to the hydraulic cylinder to the outside.

[0012] Preferably, an oil tank and an oil pump are arranged inside the frame, and the oil pump, the oil tank and the hydraulic cylinder form an oil supply cycle through pipelines.

[0013] Preferably, a controller is further included. The controller is fixedly connected to the top of the frame through a flat plate bracket, and the controller is in signal connection with the oil pump and the measuring instrument.

[0014] Preferably, the measuring instrument is an electronic ruler. The electronic ruler includes a ruler body and a ruler rod. The ruler body is fixedly connected to the surface of the hydraulic cylinder, one end of the expanding tube head is fixedly connected with a connecting piece, and one end of the ruler rod is fixedly connected with the connecting piece.

[0015] The beneficial effect of the present disclosure mainly lies in that: by detecting the stroke of the hydraulic cylinder through the measuring instrument, the present utility model can accurately control the flaring diameter of the pipe fitting. The staff only needs to sleeved the pipe fitting on the expanding tube die, and drive the expanding tube head through the hydraulic cylinder to expand the expanding tube die to enlarge the pipe orifice, with high automation degree, high precision and small error.

[0016] It should be understood that both the foregoing general description and the following detailed description are for the purpose of illustration and example only and are not necessarily restrictive of the present disclosure. The accompanying drawings incorporated in and constituting a part of this specification illustrate the subject matter of the present disclosure. At the same time, the specification and the drawings are used to explain the principles of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific embodiments of the present disclosure or the technical solutions in the prior art, the following will briefly introduce the drawings required to be used in the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present disclosure. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1 is a three-dimensional structural schematic diagram of the expanding tube machine according to an embodiment of the present disclosure;

[0019] Figure 2 is an internal structural schematic diagram of the expanding tube machine according to an embodiment of the present disclosure;

[0020] Figure 3Cross-sectional view of the tube expanding machine according to an embodiment of the present disclosure;

[0021] Figure 4 According to an embodiment of the present disclosure Figure 3 Schematic diagram of partial enlargement at position A in

[0022] Icon: 1 - Frame; 2 - Hydraulic cylinder; 21 - Piston; 3 - Tube expanding head; 4 - Tube expanding die; 41 - Fixed pressing plate; 411 - Movable groove; 412 - Pin; 42 - Tube expanding block; 421 - Guide groove; 422 - Spring installation groove; 423 - Return spring; 43 - Arc-shaped cushion block; 5 - Measuring instrument; 51 - Scale body; 52 - Scale rod; 53 - Connecting piece; 6 - Pressing block; 61 - Guide block; 7 - Oil tank; 8 - Oil pump; 9 - Controller. Detailed implementation manners

[0023] Next, the technical solutions of the present disclosure will be described clearly and completely with reference to the accompanying drawings. Apparently, the described embodiments are some, but not all, of the embodiments of the present disclosure.

[0024] All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present disclosure without creative efforts shall fall within the protection scope of the present disclosure.

[0025] In the description of the present disclosure, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present disclosure. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0026] In the description of the present disclosure, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present disclosure can be understood according to specific situations.

[0027] Embodiment

[0028] As Figures 1-4As shown in the figure, this embodiment provides a tube expanding machine, which includes a frame 1. Inside the frame 1, a hydraulic cylinder 2, an oil tank 7, and an oil pump 8 are fixedly connected. The hydraulic cylinder 2, the oil tank 7, and the oil pump 8 are sequentially connected through oil pipes to form an oil circuit cycle to provide pressure for the hydraulic pump. The piston 21 of the hydraulic cylinder 2 is fixedly connected with a tube expanding head 3 through bolts. A circular opening is formed on the surface of the frame 1, and the tube expanding head 3 can penetrate through the opening and extend to the outside of the frame 1. A tube expanding die 4 is fixedly connected at the opening. The tube expanding head 3 is in transmission connection with the tube expanding die 4. When the tube expanding head 3 is driven by the hydraulic cylinder 2 to move outward, the tube expanding die 4 will be gradually expanded. By sleeving the end of the pipe fitting on the outside of the tube expanding die 4, the pipe fitting is flared when the tube expanding die 4 is expanded. The hydraulic cylinder 2 is fixedly connected with a measuring instrument 5. The measuring instrument 5 is used to detect the formation of the hydraulic cylinder 2, so as to control the moving distance of the tube expanding head 3, achieving the effect of controlling the flaring diameter. The measuring instrument 5 is in signal connection with the hydraulic cylinder 2. By presetting the diameter that needs to be flared, the controller 9 converts it into the moving stroke of the hydraulic cylinder 2. When the measuring instrument 5 detects that the moving stroke of the hydraulic cylinder 2 reaches the preset value, it commands the hydraulic cylinder 2 to stop working, thereby accurately controlling the flaring diameter.

[0029] In this embodiment, the measuring instrument 5 is an electronic ruler. The electronic ruler includes a ruler body 51 and a ruler rod 52. The ruler body 51 is fixedly connected to the surface of the hydraulic cylinder 2. One end of the tube expanding head 3 is fixedly connected with a connecting piece 53, and one end of the ruler rod 52 is fixedly connected with the connecting piece 53. When the hydraulic cylinder 2 drives the tube expanding head 3 to move, it drives the ruler rod 52 to move. The moving distance of the ruler rod 52 is the stroke of the hydraulic cylinder 2, so as to accurately control the stroke and improve the flaring accuracy.

[0030] Among them, the tube expanding die 4 includes a fixed pressing plate 41. The fixed pressing plate 41 is of an annular structure and is fixedly installed on the outside of the opening through bolts. A plurality of tube expanding blocks 42 are movably connected to the inside of the fixed pressing plate 41. The plurality of tube expanding blocks 42 are arranged in a circumferential array. When the plurality of tube expanding blocks 42 are combined together, a circular ring structure is formed in the middle. The tube expanding head 3 penetrates through the middle of the tube expanding blocks 42 and is in contact with the tube expanding blocks 42. By pushing the tube expanding blocks 42 with the tube expanding head 3, the tube expanding blocks 42 are moved outward, and the pipe fitting sleeved on the outside of the tube expanding blocks 42 is flared under the extrusion of the tube expanding blocks 42.

[0031] Specifically, an activity groove 411 is formed on the inside of the fixed pressing plate 41. One end of the tube expanding block 42 is embedded in the activity groove 411. An installation groove is formed on the side surface of the tube expanding block 42, and a pin 412 is embedded in the installation groove. The pin 412 is connected with the tube expanding block 42. One end of the tube expanding block 42 is restricted inside the fixed pressing plate 41 by the pin 412 and can move along the direction of the pin 412.

[0032] Furthermore, a pressing block 6 is fixedly connected by bolts at the position of the opening on the inner side of the frame 1. The pressing block 6 is fixedly connected by bolts to the fixed pressing plate 41. By connecting the pressing block 6 and the fixed pressing plate 41, the structural strength is improved. Moreover, a guiding block 61 is provided at a position corresponding to the expanding tube block 42 on the pressing block 6. A guiding groove 421 is formed at a position corresponding to the end of the expanding tube block 42 and the guiding block 61. The guiding block 61 is embedded in the guiding groove 421 and is in clearance fit with the guiding groove 421. Through the guiding of the guiding groove 421 and the guiding block 61, the moving direction of the expanding tube block 42 is more accurate, improving the flaring quality.

[0033] Furthermore, at least one spring installation groove 422 is respectively formed at both ends of the outer side of the expanding tube block 42. The spring installation grooves 422 of the plurality of expanding tube blocks 42 are on the same horizontal plane. A return spring 423 is sleeved outside the spring installation grooves 422 of the plurality of expanding tube blocks 42. By sleeving the return spring 423 outside the plurality of spring installation grooves 422, when the expanding tube head 3 retracts, the plurality of expanding tube blocks 42 are reset by the elastic force of the return spring 423. In this embodiment, the number of spring installation grooves 422 on each expanding tube block 42 is three. One is arranged near the fixed pressing plate 41, and the other two are arranged at one end away from the fixed pressing plate 41. Through the arrangement of the three groups of return springs 423, it is ensured that the expanding tube blocks 42 can be quickly reset.

[0034] Wherein, an arc-shaped cushion plate 43 is detachably connected to the outer side of the expanding tube block 42. The arc-shaped cushion plate 43 is installed on the outer side of the expanding tube block 42 by bolts. The outer side surfaces of the plurality of arc-shaped cushion plates 43 are arc-shaped surfaces, and when combined, they form a cylindrical structure. By providing arc-shaped cushion plates 43 with different thicknesses, it is possible to adapt to the use of pipe fittings with different inner diameters, avoiding the situation where the inner diameter of the pipe fitting is too large and the expanding tube block 42 cannot expand it.

[0035] In this embodiment, the diameter of the expanding tube head 3 gradually decreases from the end close to the hydraulic cylinder 2 outward. Since the diameter of the expanding tube head 3 gradually increases, when the expanding tube head 3 extends outward, the greater the extension distance, the greater the distance for expanding the expanding tube block 42, and the corresponding flaring diameter is larger. Thus, the flaring diameter of the pipe fitting can be controlled by controlling the stroke of the hydraulic cylinder 2.

[0036] Further, it also includes a controller 9, which is fixedly connected to the top of the frame 1 through a flat plate bracket. The controller 9 is signal-connected to the oil pump 8 and the measuring instrument 5. The controller 9 is a PLC controller 9. The controller 9 is connected through a flat plate bracket and can be rotated to adjust the angle (rotating the flat plate bracket is a prior art, and its specific structure and principle will not be elaborated in detail here), which is convenient for the staff to operate. After the staff sleeved the pipe fitting on the tube expanding die 4, parameters are set through the controller 9, and then the hydraulic cylinder 2 works to drive the tube expanding head 3 to extend outwards. During the extension of the tube expanding head 3, the expanding block 42 is extruded to expand outwards. At this time, the pipe orifice of the pipe fitting is gradually enlarged. After the measuring instrument 5 detects that the moving distance of the tube expanding head 3 reaches the set value, it sends a signal to the controller 9, and the controller 9 controls the piston 21 of the hydraulic cylinder 2 to contract, driving the tube expanding head 3 to retract, completing the flaring operation.

[0037] The working principle of the present utility model: After the staff sleeved the pipe fitting on the tube expanding die 4, parameters are set through the controller 9, and then the hydraulic cylinder 2 works to drive the tube expanding head 3 to extend outwards. During the extension of the tube expanding head 3, the expanding block 42 is extruded to expand outwards. At this time, the pipe orifice of the pipe fitting is gradually enlarged. After the measuring instrument 5 detects that the moving distance of the tube expanding head 3 reaches the set value, it sends a signal to the controller 9, and the controller 9 controls the piston 21 of the hydraulic cylinder 2 to contract, driving the tube expanding head 3 to retract, completing the flaring operation. At the same time, the return spring 423 resets the expanding block 42, waiting for the next operation.

[0038] Finally, it should be noted that: The above embodiments are only used to illustrate the technical solutions of the present disclosure, and are not intended to limit them; Although the present disclosure has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: They can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; And these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present disclosure.

Claims

1. A tube expander, characterized in that: include: A frame, wherein a hydraulic cylinder is arranged inside the frame, a piston of the hydraulic cylinder is fixedly connected to an expansion head, an opening is provided on the surface of the frame at a position corresponding to the expansion head, an expansion die is fixedly connected to the opening, the expansion head is transmission-connected to the expansion die, a measuring instrument is fixedly connected to the hydraulic cylinder, an output shaft of the measuring instrument is fixedly connected to the expansion head, and the measuring instrument is signal-connected to the hydraulic cylinder.

2. A tube expander according to claim 1, characterized in that: The tube expansion die comprises a fixed pressing plate, a plurality of tube expansion blocks are movably connected to the inner side of the fixed pressing plate, the plurality of tube expansion blocks are distributed in a circular array, and the tube expansion head is arranged through the middle of the plurality of tube expansion blocks.

3. A tube expander according to claim 2, characterized in that: A movable groove is provided on the inner side of the fixed pressing plate, one end of the expansion block is embedded in the movable groove, a mounting groove is provided on the side of the expansion block, a pin is embedded in the mounting groove, and the pin is connected to the expansion block.

4. A tube expander according to claim 2, characterized in that: A pressure block is fixedly connected to the inner side of the frame at the position of the opening, and the pressure block is fixedly connected to the fixed pressure plate. A guide block is provided at a position corresponding to the pressure block and the expansion block. A guide groove is provided at the end of the expansion block at a position corresponding to the guide block. The guide block is embedded in the guide groove and is clearance-matched with the guide groove.

5. A tube expander according to claim 2, characterized in that: At least one spring installation groove is respectively formed at two ends of the outer side of the expansion tube block, and a plurality of return springs are respectively sleeved on the outer sides of the spring installation grooves of the expansion tube blocks.

6. A tube expander according to any one of claims 2 to 5, characterized in that: The outer side of the expansion tube block is detachably connected with an arc-shaped pad.

7. A tube expander according to claim 1, characterized in that: The diameter of the expansion head gradually decreases from one end close to the hydraulic cylinder toward the outside.

8. A tube expander according to claim 1, characterized in that: An oil tank and an oil pump are arranged inside the frame, and the oil pump, the oil tank and the hydraulic cylinder form an oil supply circulation through pipelines.

9. A tube expander according to claim 8, characterized in that: The machine also includes a controller, which is fixedly connected to the top of the frame through a flat bracket, and the controller is connected to the oil pump and the measuring instrument by signal.

10. A tube expander according to claim 1, characterized in that: The measuring instrument is an electronic ruler, which includes a ruler body and a ruler rod. The ruler body is fixedly connected to the surface of the hydraulic cylinder, one end of the expansion head is fixedly connected to a connecting piece, and one end of the ruler rod is fixedly connected to the connecting piece.

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