CN113182403A - Diameter-variable multi-point contact radial support core rod for pipe fitting bending - Google Patents
Diameter-variable multi-point contact radial support core rod for pipe fitting bending Download PDFInfo
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- CN113182403A CN113182403A CN202110510661.9A CN202110510661A CN113182403A CN 113182403 A CN113182403 A CN 113182403A CN 202110510661 A CN202110510661 A CN 202110510661A CN 113182403 A CN113182403 A CN 113182403A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D9/00—Bending tubes using mandrels or the like
- B21D9/01—Bending tubes using mandrels or the like the mandrel being flexible and engaging the entire tube length
- B21D9/03—Bending tubes using mandrels or the like the mandrel being flexible and engaging the entire tube length and built-up from loose elements, e.g. series of balls
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Abstract
The invention discloses a variable-diameter multi-point contact radial support core rod for pipe bending. The device comprises a mandrel and a variable-diameter core ball chain, wherein the mandrel and the variable-diameter core ball chain are coaxially connected through a ball hinge; the variable-diameter core ball chain is formed by connecting a plurality of variable-diameter core balls, and each variable-diameter core ball comprises a core ball connecting part, a variable-diameter supporting part and an adjusting and locking part; when the adjusting locking part is opened, the driving bevel gear is rotated, the driven bevel gear shaft drives the telescopic hollow shaft to move towards or away from the center of the mandrel by driving the driven bevel gear on the mandrel ball support to rotate, so that the diameter of the mandrel is adjusted, when the adjusting locking part is locked, the two locking adjusting rods are restored to a closed state under the action of the reset spring, the driving bevel gear cannot rotate relative to the connecting shaft, and the radial position of the reducing supporting part cannot be changed. The mandrel has a simple structure, is convenient to adjust, can meet the requirement that one mandrel is suitable for bending and forming pipe fittings with different diameters, can reduce the production cost of cored bending, and improves the production efficiency.
Description
Technical Field
The invention belongs to the field of pipe fitting bending forming, and particularly relates to a diameter-variable multipoint contact radial support core rod for pipe fitting bending.
Background
The pipe is of a hollow structure, so that the defects of cross section change distortion, wrinkling and the like are inevitably generated in the bending forming process of the pipe, the cross section distortion and wrinkling of the bent pipe not only affect the appearance quality of the tubular member, but also affect the structural stability of the tubular member, and when the bent pipe is used as a conveying pipeline, the cross section distortion and wrinkling of the bent pipe can cause pressure loss and flow pulsation of conveying fluid. In order to reduce the defects of the bent pipe such as cross-sectional distortion and wrinkles, bending is generally performed by placing a mandrel bar in the pipe blank as a support.
In medium and large diameter pipe bending, pipe bending is typically performed using a flexible mandrel as a support. The flexible core rod comprises a core shaft and core balls, each existing core rod can only be used for forming a bent pipe with a certain pipe diameter, so that pipes with different diameters need core rods with corresponding sizes, and the core ball structure and the machining process are relatively complex, the production and manufacturing cost is high, and the utilization rate of the core rods is not high for cored bending of small-batch pipe fittings, so that the cored bending cost is relatively high.
Aiming at the problems, the scheme of the variable-diameter core rod is proposed at present, but the existing variable-diameter core rod schemes have the problems that the core rod cannot continuously reduce the diameter and only can realize discrete diameter reduction, namely the variable-diameter core rod can only be used for pipes with certain specific diameters; meanwhile, the problems of complex structure, complex diameter-changing process, inconvenient adjustment and the like exist.
Disclosure of Invention
In order to solve the problems in the background art, the invention provides the diameter-variable multipoint contact radial support core rod for bending the pipe fittings, which is used for bending and forming the pipe fittings with different diameters, is convenient to adjust, can reduce the production cost of cored bending and improve the production efficiency.
The technical scheme adopted by the invention is as follows:
diameter-variable multi-point contact radial support core rod for pipe bending
The supporting core rod comprises a core shaft and a variable-diameter core ball chain, and one end of the core shaft is coaxially connected with one end of the variable-diameter core ball chain through a ball hinge; the variable-diameter core ball chain is formed by connecting a plurality of variable-diameter core balls, and each variable-diameter core ball comprises a core ball connecting part, a variable-diameter supporting part and an adjusting and locking part;
the core ball connecting part comprises a connecting shaft, a first connector and a second connector, and the first connector and the second connector are fixedly connected to two ends of the connecting shaft respectively;
the reducing support part comprises a core ball support, a driving bevel gear, a driven bevel gear fixing frame and an annular support structure; the driving bevel gear is sleeved on the connecting shaft through a driving bevel gear bearing, a plurality of driven bevel gears meshed with the driving bevel gear are distributed on the surface of the driving bevel gear at equal intervals in the circumferential direction, each driven bevel gear is fixedly provided with a driven bevel gear shaft penetrating through a central hole of the driven bevel gear, the driven bevel gear shaft is arranged in a driven bevel gear fixing frame through a driven bevel gear bearing, the driven bevel gear fixing frame is fixed on the core ball support, one end of the driven bevel gear shaft extends inwards to extend into a circular groove formed in the core ball support, the other end of the driven bevel gear shaft is connected with one end of the telescopic hollow shaft through threads, and the other end of the telescopic hollow shaft is connected with the annular supporting structure;
the main supporting blocks and the auxiliary supporting blocks are alternately installed to form an annular supporting structure, the main supporting blocks are matched with an arc-shaped groove formed in one end of the previous auxiliary supporting block through sliding pins arranged at one end of the main supporting blocks to realize sliding connection, the other ends of the main supporting blocks are hinged with the next auxiliary supporting block, and each main supporting block is fixedly connected with the other end of the corresponding telescopic hollow shaft;
the locking adjusting part comprises a locking support, locking adjusting rods and a reset spring, the side surface of the driving bevel gear far away from the driven bevel gear is fixedly provided with the locking support, the locking support is provided with supports above and below the connecting shaft, the two supports are respectively provided with two clamping connecting shaft locking adjusting rods through the reset spring, and the two locking adjusting rods clamp the connecting shaft up and down through arc-shaped clamping blocks arranged at one end of each clamping adjusting rod.
The first connector is a sphere, the second connector is a sphere base, and the second connector of the previous variable diameter core sphere is connected with the first connector of the next variable diameter core sphere through a spherical hinge.
The core ball support is sleeved on the connecting shaft, a plurality of gear mounting grooves for limiting the driven bevel gears are formed in the core ball support, and a circular groove is formed in the bottom of each gear mounting groove; a driven bevel gear fixing frame is fixedly arranged at the opening of each gear mounting groove, and a supporting tube for limiting the driven bevel gear shaft is arranged on the driven bevel gear fixing frame; each driven bevel gear shaft is installed in a driven bevel gear fixing frame through a driven bevel gear bearing, one end of each driven bevel gear shaft extends into a circular groove of the core ball support and is in clearance fit with the circular groove, and the other end of each driven bevel gear shaft penetrates out of a supporting tube of the driven bevel gear fixing frame and then is in threaded connection with one end of the telescopic hollow shaft.
And mounting holes for mounting a return spring are formed in two sides of each support of the locking support, and two sides of the end part of the other end of each locking adjusting rod are connected with the mounting holes in two sides of the support of the locking support through the return springs.
The inner surfaces of the arc-shaped clamping blocks of the two locking adjusting rods are rough surfaces, and the inner diameters of the arc-shaped clamping blocks are adaptive to the outer diameter of the connecting shaft.
The reset spring adopts a torsion spring.
A driving bevel gear fixing frame for axially positioning the driving bevel gear is arranged on one side of the driving bevel gear, which is far away from the driven bevel gear shaft, and the driving bevel gear is connected with the driving bevel gear fixing frame through a thrust ball bearing; the driving bevel gear fixing frame is in butt joint with the core ball support.
Axial grooves are formed in two ends of each auxiliary supporting block, and arc-shaped grooves are formed in two sides of the axial groove in one end of each auxiliary supporting block; a hinge pin is arranged at one end of the main supporting block, and a sliding pin is arranged at the other end of the main supporting block; one end of the main supporting block extends into the axial groove at one end of the previous auxiliary supporting block, and a sliding pin arranged at the end part of the main supporting block is slidably arranged in arc-shaped grooves at two sides of the axial groove of the previous auxiliary supporting block; the other end of the main supporting block extends into an axial groove at the other end of the following auxiliary supporting block, and the main supporting block is connected with the following auxiliary supporting block through a hinge pin in a hinged mode.
Second, an adjusting method of a diameter-variable multi-point contact radial support core rod for pipe bending
The method comprises the following steps:
(1) the two locking adjusting rods are pressed by hands to enable the two arc-shaped clamping blocks at the end parts of the two locking adjusting rods to be in an open state and separated from the connecting shaft, and at the moment, the driving conical wheel can rotate relative to the connecting shaft and the core ball support;
(2) adjusting the radial positions of the main supporting block and the auxiliary supporting block in the mandrel according to the inner diameter of the pipe to be bent, so that the diameter of the annular supporting structure is changed, and the diameter of the mandrel is adapted to the inner diameter of the pipe to be bent;
the locking part is rotated and adjusted to drive the driving bevel gear to rotate while the two locking adjusting rods are pressed by hands, the driving bevel gear drives all the driven bevel gears to rotate, so that driven bevel gear shafts fixedly connected to the driven bevel gears are driven to rotate, the driven bevel gear shafts drive the telescopic hollow shafts to move towards or away from the center of the mandrel, and the radial positions of the main supporting blocks relative to the center of the mandrel are changed by the movement of the telescopic hollow shafts, so that the radial positions of the auxiliary supporting blocks relative to the center of the mandrel are changed;
(3) when the diameter of the mandrel is adjusted to the required diameter of the mandrel, a hand is removed from the locking adjusting rod, the two arc-shaped clamping blocks of the two locking adjusting rods are restored to a closed state under the action of the reset spring, the two arc-shaped clamping blocks are completely contacted with the connecting shaft to clamp the connecting shaft, so that the driving conical wheel fixedly connected with the locking support cannot rotate relative to the connecting shaft, the radial positions of the main supporting block and the auxiliary supporting block are not changed, and the diameter of the mandrel is adjusted.
The invention has the beneficial effects that:
(1) the invention can realize the change of the diameter of the core rod by adjusting the radial position of the supporting block, and can be used for bending and forming pipe fittings with different diameters.
(2) According to the invention, the number of contact points between the core rod and the inner wall of the pipe in the pipe bending process can be increased by arranging the auxiliary supporting block, and the pipe forming quality is improved.
(3) The diameter adjusting mechanism is simple in structure and convenient to adjust, the diameter adjusting process can be achieved by adjusting the clamping mechanism to rotate the driving bevel gear, and the adjusting process is simple.
(4) The invention adjusts the position of the supporting block in a screw pair mode, and can bear larger extrusion force of the pipe on the core rod through screw thread self-locking.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic view of a variable diameter core ball structure according to the present invention;
FIG. 3 is an overall structural diagram of a variable diameter core ball of the present invention, wherein (a) and (b) are structural diagrams at two different angles, respectively;
FIG. 4 is a cross-sectional view of the overall construction of a variable diameter core ball of the present invention;
FIG. 5 is a schematic view of a portion of the variable diameter support portion of the present invention 1;
FIG. 6 is a schematic structural diagram of a portion of the variable diameter support portion of the present invention, shown in FIG. 2;
FIG. 7 is a schematic view of a core ball support structure according to the present invention;
FIG. 8 is a schematic structural view of a driven bevel gear holder according to the present invention;
FIG. 9 is a schematic structural diagram of the main support block of the present invention;
FIG. 10 is a schematic view of the auxiliary support block configuration of the present invention;
FIG. 11 is an operational view of the adjustment locking portion of the present invention, wherein (a) and (b) are two operational states, locking and unlocking, respectively;
FIG. 12(a) is a schematic view showing a minimum diameter position of a variable diameter core ball according to the present invention;
FIG. 12(b) is a schematic view showing the maximum diameter position of the variable diameter core ball according to the present invention;
FIG. 13(a) is a schematic illustration of a variable diameter core ball of the present invention in a bent pipe when the diameter is small;
FIG. 13(b) is a schematic view of the present invention showing a case where the variable diameter core ball has a large diameter in bending a pipe.
In the figure: 1. the core shaft comprises a core shaft body, 2, a variable-diameter core ball, 3, a core ball connecting part, 4, a variable-diameter supporting part, 5, an adjusting locking part, 6, a connecting shaft, 7, a first connecting head, 8, a second connecting head, 9, a core ball support, 10, a driving bevel gear, 11, a driving bevel gear bearing, 12, a driving bevel gear fixing frame, 13, a thrust bearing, 14, a driven bevel gear, 15, a driven bevel gear fixing frame, 16, a driven bevel gear bearing, 17, a driven bevel gear shaft, 18, a telescopic hollow shaft, 19, a main supporting block, 20, a hinge pin, 21, a sliding pin, 22, an auxiliary supporting block, 23, a locking support, 24, a locking adjusting rod, 25, a reset spring, 191, a main supporting block hole A, 192 and a main supporting block hole B.
Detailed Description
The invention is described in further detail below with reference to the figures and the embodiments.
As shown in figure 1, the variable-diameter multi-point contact radial support core rod for bending the pipe fitting comprises a mandrel 1 and variable-diameter core balls 2, wherein the variable-diameter core balls 2 are in ball hinge joint with the mandrel 1 through a first connecting joint 7, and a plurality of variable-diameter core balls 2 are connected through the connecting joint.
As shown in fig. 1, the mandrel 1 can be replaced according to the diameter of the mandrel required by bending and forming the tube, one end of the mandrel 1 is provided with a spherical groove for forming a spherical hinge joint with a first connector 7 of a core ball connecting part 3 in a variable-diameter core ball 2, the first connector 7 of the first variable-diameter core ball 2 is connected with the mandrel 1, the first connectors 7 of the variable-diameter core balls 2 at the back are respectively formed into a spherical hinge joint with a second connector of the previous variable-diameter core ball 2, the second connector 8 of the last variable-diameter core ball 2 is suspended, and the variable-diameter core balls 2 form a chain structure.
As shown in fig. 2, the variable diameter core ball 2 includes a core ball connecting portion 3, a variable diameter support portion 4, and an adjustment locking portion 5, the variable diameter support portion 4 is installed on a connecting shaft 6 in the core ball connecting portion 3, and the adjustment locking portion 5 is installed on a drive bevel gear 10 of the variable diameter support portion 4.
As shown in fig. 3, the core ball connecting portion 3 includes a connecting shaft 6, a first connector 7, and a second connector 8, the first connector 7 is fixedly connected to one end of the connecting shaft 6, the second connector 8 is fixedly connected to the other end of the connecting shaft 6, and the connecting shaft 6 is a stepped shaft.
As shown in fig. 4 to 6, the reducing support portion 4 includes a core ball support 9, a driving bevel gear 10, a driving bevel gear bearing 11, a driving bevel gear axial fixing frame 12, a thrust bearing 13, a driven bevel gear 14, a driven bevel gear fixing frame 15, a driven bevel gear bearing 16, a driven bevel gear shaft 17, a telescopic hollow shaft 18, a main support block 19, a hinge pin 20, a slide pin 21, and an auxiliary support block 22, the core ball support 9 is provided with a gear mounting groove for limiting the driven bevel gear 14 as shown in fig. 7, as shown in fig. 5, the core ball support 9 is fixedly connected with the connecting shaft 6 of the core ball connecting portion 3 through a central hole, the driving bevel gear axial fixing frame 12 is mounted on the core ball support 9, the driving bevel gear 10 is mounted on the connecting shaft 6 through the driving bevel gear bearing 11, the driving bevel gear 10 can rotate relative to the connecting shaft 6 and the core ball support, the driving bevel gear 10 is axially positioned by connecting the thrust bearing 13 with the driving bevel gear axial fixing frame 12, as shown in fig. 8, one end of the driven bevel gear holder 15 is butt-mounted in the gear mounting groove of the core ball support 9, the tubular portion is mounted outward, and as shown in fig. 6, the driven bevel gear 14 is fixedly connected with the driven bevel gear shaft 17.
As shown in fig. 4 and 6, the driven bevel gear shaft 17 has an external thread at one end and is installed in a circular groove of the inner ring 9 at the other end, the driven bevel gear shaft 17 is connected to a driven bevel gear holder 15 through a driven bevel gear bearing 16, and the driven bevel gear 14 is engaged with the drive bevel gear 10.
As shown in fig. 4 to 10, an internal thread is formed at one end of the interior of the hollow telescopic shaft 18 and coaxially mounted with the driven bevel gear shaft 17 to form a threaded connection, the main support block 19 is fixedly connected to the other end of the hollow telescopic shaft 18, the main support block 19 is an arc block, the hinge pin 20 is mounted in the main support block hole a191, the slide pin 21 is mounted in the main support block hole B192, the auxiliary support block 22 is an arc block, one end of the auxiliary support block is provided with a hole to be hinged with the hinge pin 20, the other end of the auxiliary support block is provided with a notch along the radial direction and is provided with an arc groove along the axial direction, the slide pin 21 on the other main support block 19 can slide in the arc groove, the main support block 19 and the auxiliary support block 22 are alternately mounted to form a ring, and the entire circumference provides an approximately circular support for the inner wall of the tube through the linkage of the support blocks, which is preferably 6 auxiliary support, The driven bevel gear shaft 17, the telescopic hollow shaft 18, the hinge pin 20 and the slide pin 21 are respectively 6, the more the supporting blocks are, the more the support provided by the core rod is similar to a circle, and the better the supporting effect is.
As shown in fig. 11, the adjusting and locking portion 5 includes a locking bracket 23, a locking adjusting rod 24, and a return spring 25, the locking bracket 23 is fixedly connected to the driving bevel wheel, a mounting hole for fixing the locking adjusting rod 24 is formed in the locking bracket 23, one end of the locking adjusting rod 24 is of an arc-shaped structure, the inner surface of the arc-shaped structure is rough, the number of the locking adjusting rods 24 is two, the inner surfaces of the two arc-shaped structures contact with the connecting shaft 6, so that the driving bevel gear 10 cannot rotate relative to the connecting shaft 6, the number of the return springs 25 is 4, the return springs are mounted in the mounting hole of the locking bracket 23, and the other end of the return springs is connected to the rotating pin on the locking adjusting rod 24.
As shown in fig. 11(b), when the two locking adjustment bars 24 are pressed by hand to open the two circular arc structures, the drive bevel gear 10 can be rotated relative to the connecting shaft 6 by the rotation of the hand; as shown in fig. 11(a), when the hand is released, the locking connecting rod returns the two circular arc structures to the closed state under the action of the return spring 25 to be in full contact with the connecting shaft 6, so that the driving cone wheel cannot rotate relative to the connecting shaft 6.
The specific implementation mode is as follows:
(1) the two locking adjusting rods 24 are pressed by hands to enable the arc-shaped structure to be in an open state and separated from the connecting shaft 6, and at the moment, the driving conical wheel can rotate relative to the connecting shaft 6 and the core ball support 9.
(2) Adjusting the diameter of the core rod according to the inner diameter of the pipe to be bent,
the locking adjusting part is driven by hand to rotate the driving bevel gear 10, the driving bevel gear 10 drives all the driven bevel gears 14 on the core ball support 9 to rotate, the driven bevel gear shaft 17 rotates to enable the telescopic hollow shaft 18 to face or be far away from the center of the mandrel 1, the radial position of the main supporting block 19 is changed by the movement of the telescopic hollow shaft 18, the radial position of the auxiliary supporting block 22 is changed accordingly, the diameter of a circular ring formed by the main supporting block 19 and the auxiliary supporting block 22 is changed by adjusting the radial positions of the main supporting block 19 and the auxiliary supporting block 22 in the mandrel, and therefore the diameter of the mandrel is changed.
(3) When the diameter of the mandrel is adjusted to the required diameter of the mandrel, a hand is moved away from the locking adjusting rods 24, the two locking adjusting rods 24 are restored to the closed state under the action of the return spring 25 and are completely contacted with the connecting shaft 6, so that the driving conical wheel cannot rotate relative to the connecting shaft 6, the radial positions of the main supporting block 19 and the auxiliary supporting block 22 are not changed, and the diameter of the mandrel is adjusted.
Fig. 12(a) and 12(b) are schematic views of a minimum position and a maximum position of a diameter of a variable diameter core sphere, respectively, and fig. 13(a) and 13(b) are schematic views of a variable diameter multipoint contact radial support core rod in bending a pipe in different effective support diameter states, respectively.
Claims (8)
1. A diameter-variable multipoint contact radial support core rod for bending a pipe fitting is characterized by comprising a core shaft (1) and a diameter-variable core ball chain, wherein one end of the core shaft (1) is coaxially connected with one end of the diameter-variable core ball chain through a ball hinge; the variable-diameter core ball chain is formed by connecting a plurality of variable-diameter core balls (2), and each variable-diameter core ball (2) comprises a core ball connecting part (3), a variable-diameter supporting part (4) and an adjusting and locking part (5);
the core ball connecting part (3) comprises a connecting shaft (6), a first connector (7) and a second connector (8), and the first connector (7) and the second connector (8) are fixedly connected to two ends of the connecting shaft (6) respectively;
the reducing support part (4) comprises a core ball support (9), a driving bevel gear (10), a driven bevel gear (14), a driven bevel gear fixing frame (15) and an annular support structure; the driving bevel gear (10) is sleeved on the connecting shaft (6) through a driving bevel gear bearing (11), a plurality of driven bevel gears (14) meshed with the driving bevel gear (10) are circumferentially distributed on the surface of the driving bevel gear (10) at equal intervals, a driven bevel gear shaft (17) penetrating through a central hole of each driven bevel gear (14) is fixedly installed on each driven bevel gear (14), each driven bevel gear shaft (17) is installed in a driven bevel gear fixing frame (15) through a driven bevel gear bearing (16), each driven bevel gear fixing frame is fixed on the core ball support (9), one end of each driven bevel gear shaft (17) extends inwards to extend into a circular groove formed in the core ball support (9), the other end of each driven bevel gear shaft is connected with one end of the telescopic hollow shaft (18) through threads, and the other end of the telescopic hollow shaft (18) is connected with the annular supporting structure;
the main supporting blocks (19) and the auxiliary supporting blocks (22) are alternately installed to form an annular supporting structure, the main supporting blocks (19) are matched with an arc-shaped groove formed in one end of the previous auxiliary supporting block (22) through sliding pins (21) arranged at one end to realize sliding connection, the other ends of the main supporting blocks (19) are hinged with the next auxiliary supporting block (22), and each main supporting block (19) is fixedly connected with the other end of the corresponding telescopic hollow shaft (18);
the adjusting and locking part (5) comprises a locking support (23), locking adjusting rods (24) and a reset spring (25), the locking support (23) is fixedly arranged on the surface of one side, away from the driven bevel gear (14), of the driving bevel gear (10), supports are arranged above and below the connecting shaft (6) of the locking support (23), two locking adjusting rods (24) used for clamping the connecting shaft (6) are respectively arranged on the two supports through the reset spring (25), and the two locking adjusting rods (24) clamp the connecting shaft (6) up and down through arc-shaped clamping blocks arranged at one end parts.
2. A variable-diameter multi-point contact radial support mandrel for pipe bending according to claim 1, characterized in that the first connector (7) is a sphere, the second connector (8) is a ball seat, and the second connector (8) of the previous variable-diameter core ball (2) is connected with the first connector (7) of the next variable-diameter core ball (2) by a ball hinge.
3. The variable-diameter multi-point contact radial support mandrel for pipe bending according to claim 1, wherein the mandrel holder (9) is sleeved on the connecting shaft (6), the mandrel holder (9) is provided with a plurality of gear mounting grooves for limiting the driven bevel gears (14), and the bottom of each gear mounting groove is provided with a circular groove; a driven bevel gear fixing frame (15) is fixedly arranged at the opening of each gear mounting groove, and a supporting tube for limiting a driven bevel gear shaft (17) is arranged on the driven bevel gear fixing frame (15); each driven bevel gear shaft (17) is installed in a driven bevel gear fixing frame (15) through a driven bevel gear bearing (16), one end of each driven bevel gear shaft (17) extends into a circular groove of the core ball support (9) and is in clearance fit with the circular groove, and the other end of each driven bevel gear shaft penetrates out of a supporting tube of the driven bevel gear fixing frame (15) and then is in threaded connection with one end of a telescopic hollow shaft (18).
4. The variable-diameter multipoint-contact radial support core rod for pipe bending according to claim 1, wherein mounting holes for mounting a return spring (25) are formed in two sides of each support of the locking support (23), and two sides of the end portion of the other end of each locking adjusting rod (24) are connected with the mounting holes in two sides of the support of the locking support (23) through the return spring (25).
5. A variable-diameter multi-point contact radial support mandrel for pipe bending according to claim 4, characterized in that the inner surfaces of the arc-shaped clamping blocks of the two locking adjusting rods (24) are rough surfaces, and the inner diameters of the arc-shaped clamping blocks are adapted to the outer diameter of the connecting shaft (6).
6. The variable-diameter multipoint-contact radial support mandrel for pipe bending as claimed in claim 1, wherein a drive bevel gear fixing frame (12) for axially positioning the drive bevel gear (10) is arranged on one side of the drive bevel gear (10) away from the driven bevel gear shaft (17), and the drive bevel gear (10) is connected with the drive bevel gear fixing frame (12) through a thrust ball bearing (13); the driving bevel gear fixing frame (12) is in butt joint with the core ball support (9).
7. The variable-diameter multipoint-contact radial support mandrel for pipe bending as claimed in claim 1, wherein axial grooves are formed at both ends of the auxiliary support block (22), and arc-shaped grooves are formed at both sides of the axial groove at one end of the auxiliary support block (22); a hinge pin is arranged at one end of the main supporting block (19), and a sliding pin is arranged at the other end of the main supporting block (19);
one end of the main supporting block (19) extends into the axial groove at one end of the previous auxiliary supporting block (22), and a sliding pin arranged at the end part of the main supporting block (19) is slidably arranged in arc-shaped grooves at two sides of the axial groove of the previous auxiliary supporting block (22);
the other end of the main supporting block (19) extends into an axial groove at the other end of the following auxiliary supporting block (22), and the main supporting block (19) is hinged with the following auxiliary supporting block (22) through a hinge pin.
8. The method for adjusting the variable-diameter multipoint contact radial support core rod for pipe bending according to any one of claims 1 to 7, is characterized by comprising the following steps of:
(1) the two locking adjusting rods (24) are pressed by hands to enable the two arc-shaped clamping blocks at the end parts of the two locking adjusting rods (24) to be in an open state and separated from the connecting shaft;
(2) adjusting the radial positions of the main supporting block (19) and the auxiliary supporting block (22) in the mandrel according to the inner diameter of the pipe to be bent, so as to change the diameter of the annular supporting structure, and enabling the diameter of the mandrel to be matched with the inner diameter of the pipe to be bent:
the locking part is rotated and adjusted to drive the driving bevel gear (10) to rotate while the two locking adjusting rods (24) are pressed by hands, the driving bevel gear (10) drives all the driven bevel gears (14) to rotate, so that driven bevel gear shafts (17) fixedly connected to the driven bevel gears (14) are driven to rotate, the driven bevel gear shafts (17) drive the telescopic hollow shafts (18) to move towards or away from the center of the mandrel, and the movement of the telescopic hollow shafts (18) enables the radial position of the main supporting block (19) relative to the center of the mandrel to be changed, so that the radial position of the auxiliary supporting block (22) relative to the center of the mandrel is driven to be changed;
(3) when the diameter of the core rod is adjusted to the required diameter of the core rod, a hand is removed from the locking adjusting rod (24), the two arc-shaped clamping blocks of the two locking adjusting rods (24) are restored to a closed state under the action of the reset spring (25), the two arc-shaped clamping blocks are completely contacted with the connecting shaft (6) to clamp the connecting shaft (6), so that the driving cone pulley fixedly connected with the locking support (23) cannot rotate relative to the connecting shaft (6), the radial positions of the main support block (19) and the auxiliary support block (22) are not changed at the moment, and the diameter adjustment of the core rod is completed.
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| CN202110510661.9A CN113182403B (en) | 2021-05-11 | 2021-05-11 | Diameter-variable multipoint contact radial support mandrel for bending pipe fitting |
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| CN202110510661.9A CN113182403B (en) | 2021-05-11 | 2021-05-11 | Diameter-variable multipoint contact radial support mandrel for bending pipe fitting |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114192628A (en) * | 2021-12-10 | 2022-03-18 | 浙江大学 | Multi-sensor fusion pipe bending forming state real-time monitoring device |
| CN114346024A (en) * | 2022-01-12 | 2022-04-15 | 浙江大学 | Flexible core rod suitable for bending rectangular pipes of different sizes |
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| CN108296330A (en) * | 2018-01-18 | 2018-07-20 | 浙江大学 | A kind of diameter adjustable core clavus and mandrel structure for thin-wall pipe bending forming |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114192628A (en) * | 2021-12-10 | 2022-03-18 | 浙江大学 | Multi-sensor fusion pipe bending forming state real-time monitoring device |
| CN114346024A (en) * | 2022-01-12 | 2022-04-15 | 浙江大学 | Flexible core rod suitable for bending rectangular pipes of different sizes |
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| CN113182403B (en) | 2022-10-21 |
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