Pipe bending equipment and gap-adjustable pipe bending core rod device thereof

Abstract

The invention discloses pipe bending equipment and a gap-adjustable pipe bending mandrel device thereof. The pipe bending equipment comprises a core bead and a pull rod, and the core bead is movably mounted at one end of the pull rod; the core bead comprises a base body, adjusting blocks and an adjusting shaft, the adjusting shaft is sleeved with the base body, the base body is in sliding fit with the adjusting shaft, the adjusting blocks are in sliding fit with the base body, the multiple adjusting blocks are arranged around the adjusting shaft, and the adjusting shaft is movably connected with the pull rod; the peripheral face of the adjusting shaft comprises a conical face, and the multiple adjusting blocks are arranged around the conical face of the adjusting shaft. Therefore, due to the fact that the adjusting block in the core bead can ascend and descend, the same device can machine the guide pipe within the standard deviation range, the die cost can be reduced, the die changing time can be shortened, and the production efficiency can be improved.

Description

Technical Field

[0001] The present invention relates to the field of bending pipe shape-preserving mandrels, and in particular to a pipe bending device and a pipe bending mandrel device with adjustable clearance. Background Art

[0002] There is a technical problem that the ovality of the same specification conduit is unqualified due to uneven pipe diameters caused by different manufacturers and batches. There are many metal conduits designed on equipment such as airplanes, rockets, and spacecraft, which are used to transport various fluids and support various tasks of the equipment flight, and are extremely important parts of these equipment. Since the conduits are produced by different manufacturers and batches, there will be some differences in their outer diameters and inner diameters after production. When the requirement for the ovality of the bent finished pipe is relatively high, it is often necessary to match multiple mandrels for conduits with different inner diameters to meet the error.

[0003] The prior art with the publication number CN219401830U discloses an easy-to-pull-core pipe bending anti-wrinkle mandrel, including a mandrel element, a T-shaped piece, and a core-pulling wire. A plurality of the mandrel elements are connected end to end in sequence to form a mandrel body. A central channel is provided in the center of each mandrel element, and a plurality of core-pulling channels are communicated in the middle of the central channel. T-shaped pieces are slidably connected in the core-pulling channels. A core-pulling wire is arranged through the central channels. The mandrel elements are connected in series in sequence to form a mandrel body. Pulling the core-pulling wire can drive the steel balls to move. The maximum diameter of the steel balls abuts against the frustum. The T-shaped piece is at the maximum extended position. The arc-shaped plate fits against the inner wall of the bent pipe, and can play a good supporting role. The maximum diameter of the steel balls is misaligned with the frustum, which can reduce the diameter of the mandrel. Holding one end of the mandrel body can easily pull out the core.

[0004] The mandrel in the prior art needs to actively pull the core-pulling wire to change the height of the T-shaped piece, but this makes the control of pulling the core-pulling wire very difficult and has higher requirements for the conduit blank. Summary of the Invention

[0005] In order to solve the problem of difficult control of the outer size of the core bead in the prior art, the purpose of the present invention is to provide a pipe bending device and a pipe bending mandrel device with adjustable clearance. Using the same specification device of the present invention, the conduits within the standard deviation range can be processed, thereby reducing the mold cost, reducing the mold change time, and improving the production efficiency.

[0006] In order to achieve the above purpose, the present invention adopts the following technical solutions: A pipe bending mandrel device with adjustable clearance, including a core bead and a pull rod. The core bead is movably installed at one end of the pull rod. The core bead includes a base body, an adjusting block, and an adjusting shaft. The base body is sleeved on the adjusting shaft, and the base body is slidably matched with the adjusting shaft. The adjusting block is slidably matched with the base body. A plurality of adjusting blocks are arranged around the adjusting shaft. The adjusting shaft is movably connected with the pull rod. Among them, the outer peripheral surface of the adjusting shaft includes a conical surface, and a plurality of adjusting blocks are arranged around the conical surface of the adjusting shaft.

[0007] Preferably, the outer peripheral surface of the adjusting shaft further includes a first cylindrical surface and a second cylindrical surface. The two ends of the base body are respectively provided with a first positioning groove and a second positioning groove, and the first positioning groove and the second positioning groove are communicated with each other. The adjusting shaft is inserted into the first positioning groove and the second positioning groove. The first positioning groove matches the first cylindrical surface, and the second positioning groove matches the second cylindrical surface.

[0008] Preferably, the first cylindrical surface and the second cylindrical surface are connected by a conical surface. A jack communicated with the first positioning groove is arranged on the outer peripheral surface of the base body. The conical surface is located in the first positioning groove. The adjusting block is inserted into the jack, one end of the adjusting block extends into the first positioning groove, and the adjusting block can abut against the conical surface and the second cylindrical surface of the adjusting shaft.

[0009] Preferably, one end of the adjusting block is a driving end, and the driving end of the adjusting block abuts against the conical surface. Specifically, the driving end of the adjusting block includes a first arc surface and a second arc surface. The second arc surface is inclined. The first arc surface matches the second cylindrical surface of the adjusting shaft, and the second arc surface matches the conical surface of the adjusting shaft.

[0010] Preferably, the other end of the adjusting block is a holding end, the holding end is arc-shaped, and the adjusting block pushes against the inner wall of the catheter through the holding end.

[0011] Preferably, a first accommodating groove is arranged on the outer peripheral surface of the base body. The first accommodating groove is annular. The first accommodating groove and the first positioning groove are communicated through the jack. The holding end of the adjusting block is located in the first accommodating groove of the base body, and the adjusting block passes through the jack so that the driving end abuts against the adjusting shaft.

[0012] Preferably, one end of the adjusting shaft is connected to a pull rod, a baffle is arranged at the other end of the adjusting shaft, and an elastic member is arranged between the baffle and the base body to drive the base body to reset on the adjusting shaft.

[0013] Preferably, the elastic member is an elastic washer. The elastic washer is sleeved on the adjusting shaft, and the two ends of the elastic washer respectively abut against the base body and the baffle.

[0014] Preferably, a reset member is arranged between the adjusting block and the base body.

[0015] A pipe bending device includes the above-mentioned pipe bending mandrel device with adjustable clearance.

[0016] The beneficial effects of the technical solution of the present invention are as follows: Since the adjusting block in the above-mentioned core bead can perform lifting actions, the same device can process catheters within the standard deviation range, thereby reducing the mold cost, reducing the mold change time, and improving the production efficiency. In the above-mentioned device, the adjusting block of the core bead is passively extended under the action of the bent part of the catheter, and the extension amount of the adjusting block is determined by the bending angle of the catheter. Therefore, the same mandrel device can be used to bend catheters with different bending angle requirements. Brief Description of the Drawings

[0017] Figure 1 It is a schematic structural view of a pipe bending mandrel Figure 1 ; Figure 2 It is a schematic structural view of a pipe bending mandrel Figure 2 ; Figure 3 It is a schematic structural view of the base; Figure 4 It is a schematic structural view of the adjusting block; Figure 5 It is a schematic structural view of the adjusting shaft; Figure 6 It is a schematic structural view of the pull rod; Figure 7 It is a schematic structural view of the connecting piece.

[0018] Reference Signs in the Drawings: 11, pull rod; 111, connecting hole; 12, connecting piece; 121, ball head end; 13, base; 131, first positioning groove; 132, first accommodating groove; 133, jack; 134, second accommodating groove; 135, second positioning groove; 14, adjusting block; 141, holding end; 142, first arc surface; 143, second arc surface; 15, adjusting shaft; 151, first cylindrical surface; 152, conical surface; 153, second cylindrical surface; 154, baffle; 16, elastic member. Detailed Description of the Embodiment

[0019] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, in which the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0020] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention 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 thus should not be construed as limiting the present invention.

[0021] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, "a plurality of" means two or more, unless otherwise clearly defined.

[0022] In the present invention, unless otherwise clearly specified and defined, terms such as "mounted", "connected", "coupled", "fixed", etc. shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely means that the horizontal height of the first feature is lower than that of the second feature. Embodiment

[0024] As Figures 1 to 7 shown, a bend pipe mandrel device with adjustable clearance includes a core bead and a pull rod 11, and the core bead is movably mounted at one end of the pull rod 11; The core bead includes a base body 13, an adjusting block 14 and an adjusting shaft 15. The base body 13 is sleeved on the adjusting shaft 15, and the base body 13 is in sliding fit with the adjusting shaft 15. The adjusting block 14 is in sliding fit with the base body 13. A plurality of adjusting blocks 14 are arranged around the adjusting shaft 15, and the adjusting shaft 15 is movably connected to the pull rod 11. Among them, the outer peripheral surface of the adjusting shaft 15 includes a conical surface 152, and a plurality of adjusting blocks 14 are arranged around the conical surface 152 of the adjusting shaft 15.

[0025] With such a setting, since the adjusting block 14 in the above-mentioned core bead can perform a lifting action, the same device can be used to process the conduits within the standard deviation range, thereby reducing the mold cost, shortening the mold change time, and improving the production efficiency. In the above-mentioned device, the adjusting block 14 of the core bead is passively extended under the action of the bent part of the conduit, and the extension amount of the adjusting block 14 is determined by the bending angle of the conduit. Therefore, the same mandrel device can be used to bend conduits with different bending angle requirements.

[0026] In this embodiment, as Figure 2 and Figure 5 shown, the outer peripheral surface of the adjusting shaft 15 further includes a first cylindrical surface 151 and a second cylindrical surface 153. Both ends of the base body 13 are respectively provided with a first positioning groove 131 and a second positioning groove 135, and the first positioning groove 131 and the second positioning groove 135 communicate with each other. The adjusting shaft 15 is inserted into the first positioning groove 131 and the second positioning groove 135. The first positioning groove 131 matches the first cylindrical surface 151, and the second positioning groove 135 matches the second cylindrical surface 153. With such a setting, the stability of the movement of the base body on the adjusting shaft can be ensured.

[0027] Further preferably, the first cylindrical surface 151 and the second cylindrical surface 153 are connected by a conical surface 152. A jack 133 communicating with the first positioning groove 131 is provided on the outer peripheral surface of the base body 13. The conical surface 152 is located in the first positioning groove 131. The adjusting block 14 is inserted into the jack 133. One end of the adjusting block 14 extends into the first positioning groove 131, and the adjusting block 14 can abut against the first cylindrical surface 151, the conical surface 152 or the second cylindrical surface 153 of the adjusting shaft 15.

[0028] Further preferably, as Figure 2 , Figure 4 and Figure 5 shown, one end of the adjusting block 14 is a driving end, and the driving end of the adjusting block 14 abuts against the conical surface 152. Specifically, the driving end of the adjusting block 14 includes a first arc surface 142 and a second arc surface 143. The second arc surface 143 is inclined. The first arc surface 142 matches the first cylindrical surface 151 of the adjusting shaft, and the second arc surface 143 matches the conical surface 152 of the adjusting shaft 15. With such a setting, sufficient contact surfaces between the adjusting block and the adjusting shaft can be ensured, and thus the smooth movement of the adjusting block can be ensured.

[0029] Further preferably, as Figure 1 , Figure 3 and Figure 4 shown, the other end of the adjusting block 14 is a holding end 141, and the holding end 141 is arc-shaped. The adjusting block 14 pushes against the inner wall of the conduit through the holding end 141. With such a setting, the shape stability of the conduit can be improved.

[0030] In this embodiment, as Figures 1 to 3As shown, a first receiving groove 132 is provided on the outer peripheral surface of the base body 13. The first receiving groove 132 is annular. The first receiving groove 132 and the first positioning groove 131 are connected through the jack 133. The holding end of the adjusting block 14 is located in the first receiving groove 132 of the base body 13. The adjusting block 14 passes through the jack 133 so that the driving end abuts against the adjusting shaft 15.

[0031] In this embodiment, as Figure 1 , Figure 2 and Figure 5 shown, one end of the adjusting shaft 15 is connected to the pull rod 11. A baffle 154 is provided at the other end of the adjusting shaft 15. The elastic member 16 is disposed between the baffle 154 and the base body 13 and is used to drive the base body 13 to reset on the adjusting shaft 15. Further, the elastic member 16 is an elastic washer. The elastic washer is sleeved on the adjusting shaft 15. The two ends of the elastic washer respectively abut against the base body 13 and the baffle 154. Further, a second receiving groove 134 is provided at one end of the base body 13 facing the baffle 154. The second receiving groove 134 is connected to the first positioning groove 131. The elastic member 16 is located in the second receiving groove 134. The baffle 154 can move into the second receiving groove 134.

[0032] In this embodiment, as Figure 2 , Figure 5 and Figure 6 shown, one end of the connecting member 12 is threadedly connected to the adjusting shaft 15. The connecting member 12 and the adjusting shaft 15 are coaxially arranged. The other end of the connecting member 12 is ball-jointed to the pull rod 11. Further, the connecting member 12 is a screw. A hourglass-shaped connecting hole 111 is provided on the pull rod 11. One end of the screw passes through the connecting hole 111 and is threadedly connected to the adjusting shaft 15. The other end of the screw is a ball head end 121. The screw and the connecting hole 111 are in clearance fit.

[0033] A pipe bending device uses the above-mentioned mandrel device to perform pipe bending operations. Specifically, before bending the conduit, the core bead and the pull rod 11 are first inserted into the conduit, and the core bead is located inside the part of the conduit to be bent. When bending the conduit, part of the conduit is bent and deformed. The inner wall of the conduit acts on the core bead, causing the core bead to swing relative to the pull rod 11. During the movement of the core bead, the conduit acts on the base body 13 of the core bead, causing the base body 13 to slide on the adjusting shaft 15. The conical surface of the adjusting shaft 15 pushes the adjusting block 14 to extend out of the base body 13, and then the adjusting block 14 supports the inner wall of the conduit. Then the conduit directly acts on the adjusting block 14 to cause the base body 13 to continue to move on the adjusting shaft 15 until the conduit is bent. Embodiment

[0034] Different from the above-mentioned Embodiment 1, a reset member is provided between the adjusting block and the base body. Specifically, the reset member is a spring, and two ends of the spring are respectively connected to the adjusting block and the base body; wherein, a third accommodating groove is provided on the adjusting block, a fourth accommodating groove is provided on the inner wall of the jack, the third accommodating groove and the fourth accommodating groove cooperate to form a reset space, the spring is arranged in the reset space, and two ends of the spring are respectively connected to the inner walls of the third accommodating groove and the fourth accommodating groove. Other structures of this embodiment are the same as those described in Embodiment 1.

[0035] In the description of this specification, the descriptions referring to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0036] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Without departing from the principle and purpose of the present invention, those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A pipe bending mandrel device with adjustable gap, comprising a core bead and a pull rod (11), wherein the core bead is movably mounted on one end of the pull rod (11); characterized in that: The core bead comprises a base body (13), an adjustment block (14) and an adjustment shaft (15); the base body (13) is sleeved on the adjustment shaft (15); the base body (13) and the adjustment shaft (15) are slidably matched; the adjustment block (14) and the base body (13) are slidably matched; a plurality of adjustment blocks (14) are arranged around the adjustment shaft (15); and the adjustment shaft (15) is movably connected to the pull rod (11); wherein: When the adjusting shaft (15) moves, it can drive the adjusting block (14) to extend out from the base body (13).

2. The tube bending mandrel device with adjustable gap according to claim 1, characterized in that: The outer circumferential surface of the adjusting shaft (15) further comprises a first cylindrical surface (151), a conical surface (152) and a second cylindrical surface (153); the two ends of the base body (13) are respectively provided with a first positioning groove (131) and a second positioning groove (135); the first positioning groove (131) and the second positioning groove (135) are interconnected; the adjusting shaft (15) is inserted into the first positioning groove (131) and the second positioning groove (135); the first positioning groove (131) matches the first cylindrical surface (151); and the second positioning groove (135) matches the second cylindrical surface (153).

3. The tube bending mandrel device with adjustable gap according to claim 2, characterized in that: The first cylindrical surface (151) and the second cylindrical surface (153) are connected via the conical surface (152); a plug hole (133) connected to the first positioning groove (131) is provided on the outer peripheral surface of the base body (13); the conical surface (152) is located in the first positioning groove (131), the adjustment block (14) is inserted into the plug hole (133), and one end of the adjustment block (14) extends into the first positioning groove (131) and can abut against the first cylindrical surface (151), the conical surface (152) or the second cylindrical surface (153) of the adjustment shaft (15).

4. The tube bending mandrel device with adjustable gap according to claim 1, characterized in that: One end of the adjustment block (14) is a driving end, and the driving end of the adjustment block (14) abuts against the conical surface (152); Specifically, the driving end of the adjustment block (14) comprises a first arc surface (142) and a second arc surface (143); the second arc surface (143) is arranged to be inclined; the first arc surface (142) matches the first cylindrical surface (151) of the adjustment shaft (15); and the second arc surface (143) matches the conical surface (152) of the adjustment shaft (15).

5. The gap-adjustable tube bending mandrel device according to claim 4, characterized in that: The other end of the regulating block (14) is a retaining end (141), and the retaining end (141) is arc-shaped. The regulating block (14) pushes against the inner wall of the catheter via the retaining end (141).

6. The gap-adjustable tube bending mandrel device according to claim 5, characterized in that: The outer peripheral surface of the base body (13) is provided with a first accommodating groove (132), the first accommodating groove (132) is annular, and the first accommodating groove (132) and the first positioning groove (131) are connected via a socket (133); the retaining end of the adjustment block (14) is located in the first accommodating groove (132) of the base body (13), and the adjustment block (14) passes through the socket (133) so that the driving end abuts against the adjustment shaft (15).

7. The tube bending mandrel device with adjustable gap according to claim 1, characterized in that: One end of the adjustment shaft (15) is connected to the pull rod (11), and the other end of the adjustment shaft (15) is provided with a baffle (154); the elastic member (16) is provided between the baffle (154) and the base body (13) and is used to drive the base body (13) to reset on the adjustment shaft (15).

8. The gap-adjustable tube bending mandrel device according to claim 7, characterized in that: The elastic member (16) is an elastic washer, which is sleeved on the adjustment shaft (15), and two ends of the elastic washer respectively abut against the base body (13) and the baffle (154).

9. The tube bending mandrel device with adjustable gap according to claim 1, characterized in that: A reset piece is provided between the adjustment block (14) and the base body (13).

10. A pipe bending device, characterized in that: A tube bending mandrel device with adjustable gap comprising any one of claims 1-9.

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