A U-shaped axially limited three-roller plate bending device

Abstract

The present application provides a U-shaped axially limited three-roll plate bending device, including a roller mechanism and a limiting mechanism. The limiting mechanism includes an inner limiting portion and an outer limiting portion, which are respectively arranged on both sides of the roller mechanism axial direction in the roller bending area, and are used to limit the displacement of the fan-shaped plate along the axial direction of the roller mechanism. The inner limiting portion and the outer limiting portion can make the movement trajectory of the fan-shaped plate constantly change with the arc surface of the fan-shaped plate, and can meet the limiting requirements of fan-shaped plates with different curvatures, so that the conical plate and the curved plate can achieve automatic roll bending. The present application has the advantages of simple structure, low manufacturing cost, good versatility, convenient operation, and stable and reliable structure. It can be widely promoted and is suitable for the roll bending process of conical shell rings and curved plates of different specifications. It can achieve automatic roll bending, improve production efficiency and product precision, and reduce the labor intensity of workers.

Description

Technical Field

[0001] The present application relates to the technical field of metal plastic forming, and in particular to a U-shaped axially limited three-roll plate bending device. Background Art

[0002] Conical shell rings and curved plates are commonly used parts of pressure tanks and are widely used in many industrial fields such as aviation, aerospace, shipbuilding, gas, hydraulic machinery, etc. Since the roll bending process has the advantages of good flexibility, high production efficiency, good organizational properties, and high material utilization, the conical shell rings and curved plates are currently produced by the roll bending process.

[0003] The roll bending process of conical shell rings and curved plates is different from that of cylindrical shell rings. The cylindrical shell ring can be automatically rolled under the action of friction. The feed of conical shell rings is as follows: Figure 1 and Figure 2 As shown in the figure, currently the feeding of the conical shell ring needs to be completed by workers through successive roll bending. Figure 3 As shown, the roller bending method is adopted in sections. After each section is rolled, the fan-shaped plate needs to be manually rotated by an angle before the next section is rolled. The production efficiency is low, the labor intensity of the workers is high, and there are safety hazards.

[0004] With the increasing requirements for the pressure resistance of pressure tanks, the development trend of the tapered shell and curved plate structure of pressure tanks is to increase material strength and thickness. However, the current manual plate feeding method is obviously not suitable for modern industrial production. It not only has low productivity and high labor intensity for workers, but also limits product quality.

[0005] In summary, it is necessary to provide an improved technical solution to address the above-mentioned deficiencies in the prior art. Summary of the invention

[0006] The purpose of the embodiment of the present application is to provide a U-shaped axially limited three-roll plate bending device, which can meet the limiting requirements of fan-shaped plates with different curvatures, so that conical plates and curved plates can be automatically roll bent.

[0007] Specifically provided is a U-shaped axially limited three-roller plate bending device, which includes a roller mechanism and a limiting mechanism.

[0008] The roller mechanism includes a frame, two fixed rollers connected to the frame, and a lower pressure roller movably connected to the top of the frame. A roller bending area is between the fixed rollers and the lower pressure roller. The roller bending area is used to place the fan-shaped plate inside. The size of the roller bending area is adjusted by adjusting the height of the fixed rollers to roll-form fan-shaped plates of various thicknesses.

[0009] The limiting mechanism is clamped between the fixed roller and the lower pressure roller, and includes an inner limiting portion and an outer limiting portion, which are respectively arranged on both sides of the roller mechanism axial direction in the roller bending area to limit the displacement of the fan-shaped plate along the axial direction of the roller mechanism.

[0010] The inner limit part includes an inner limit slider, which serves as a fixed part and is freely fitted with one end of the frame. The side of the inner limit slider in contact with the fan-shaped plate is a double arc surface, which is used to abut against the inner arc surface of the fan-shaped plate after being tangent; the outer limit part includes an outer limit slider, which has a double arc surface on the side in contact with the fan-shaped plate, which is used to abut against the outer arc surface of the fan-shaped plate after being tangent to limit the fan-shaped plate.

[0011] In one embodiment, the two double arc surfaces are arranged along the feeding direction of the sector-shaped plate, so that the sector-shaped plate passes through the two double arc surfaces in sequence.

[0012] In one embodiment, a U-shaped groove is provided on the top of the inner limit slider and the outer limit slider, so that the lower pressure roller matches the U-shaped groove and rotates in the U-shaped groove.

[0013] In one embodiment, the U-shaped groove includes a vertical area and an arc area, the diameter of the arc area corresponds to the pressing roller, and the height of the vertical area corresponds to the range of the pressing distance of the pressing roller.

[0014] In one embodiment, the outer limit part is slidably connected to the other end of the frame, and the outer limit part also includes a cylinder, and the output shaft of the cylinder is connected to the outer limit slider through an outer limit push rod, and the cylinder is used to control the axial sliding of the outer limit slider along the roller mechanism, and adjust the distance between the inner limit part and the outer limit part to adapt to fan-shaped plates with different radii.

[0015] In one embodiment, both sides of the outer limit sliding block in the width direction are respectively connected with outer limit push rods, each of the outer limit push rods is respectively connected to a cylinder, and each of the cylinders is fixedly connected to the frame via a cylinder seat.

[0016] In one embodiment, the inner limit slider and the outer limit slider are symmetrically arranged on two axial sides of the roller mechanism.

[0017] In one embodiment, two arc-shaped grooves are disposed at the bottom of the inner limit slider and the outer limit slider, so that the tops of the two fixed rollers rotate in the two arc-shaped grooves respectively.

[0018] In one embodiment, the inner limit slider is detachably connected to the frame via an inner limit rod, and the length of the inner limit rod is selected according to the width of the sector plate.

[0019] In one embodiment, a force-bearing slider is provided between the inner limit rod and the frame, and the force-bearing slider is used to transmit the axial force of the inner limit slider to the frame.

[0020] Compared with the prior art, the beneficial effects of this application are:

[0021] In the technical solution of the present application, the double arc surface of the inner limit slider is tangent to the inner arc surface of the fan-shaped plate, and the fan-shaped plate is always connected to the inner limit slider through two tangent points, and the double arc surface of the outer limit slider is tangent to the outer arc surface of the fan-shaped plate, and the fan-shaped plate is always connected to the outer limit slider through two tangent points. The motion trajectory of the fan-shaped plate can be determined by multiple tangent points, and the motion trajectory changes continuously with the arc surface of the fan-shaped plate. It can meet the limiting requirements of fan-shaped plates with different curvatures, so that the conical plate and the curved plate can achieve automatic roll bending. And by contacting the double arc surface with the fan-shaped plate, it can avoid the limiting mechanism from causing damage to the arc surface of the fan-shaped plate. The present application has the advantages of simple structure, low manufacturing cost, good versatility, convenient operation, stable and reliable structure, can be widely promoted, and is suitable for the roll bending process of conical shell rings and curved plates of different specifications, can achieve automatic roll bending, improve production efficiency and product precision, and reduce the labor intensity of workers. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 It is a top view of a U-shaped axially limited three-roll plate bending device in the prior art;

[0024] Figure 2 It is a front view of a U-shaped axially limited three-roller plate bending device in the prior art;

[0025] Figure 3 Schematic diagram of the partition structure of the fan-shaped plate;

[0026] Figure 4 It is a schematic diagram of the three-dimensional structure of a U-shaped axially limited three-roll plate bending device according to an embodiment of the present application;

[0027] Figure 5 for Figure 4 A top view of a U-shaped axially limited three-roll plate bending device according to an embodiment of the present application;

[0028] Figure 6 for Figure 4 A left view of a U-shaped axially limited three-roll plate bending device according to an embodiment of the present application;

[0029] Figure 7 for Figure 4 A schematic diagram of the three-dimensional structure of the inner limiting portion of the U-shaped axial limiting three-roll plate bending device according to an embodiment of the present application;

[0030] Figure 8 for Figure 4 A top view of the inner limiting portion of the U-shaped axial limiting three-roll plate bending device according to an embodiment of the present application;

[0031] Fig. 9 for Figure 4 A top view of the outer limiting portion of the U-shaped axial limiting three-roll plate bending device according to an embodiment of the present application;

[0032] Fig.10 It is a comparison diagram of the processing process of the U-shaped axially limited three-roll plate bending device at three different moments according to the embodiment of the present application.

[0033] Description of reference numerals:

[0034] 1. Force-bearing slider; 2. First inner limit push rod; 3. Inner limit slider; 4. Fan-shaped plate; 5. Outer limit slider; 6. First outer limit push rod; 7. First cylinder base; 8. First cylinder; 9. Second inner limit push rod; 10. Third inner limit push rod; 11. Second outer limit push rod; 12. Second cylinder base; 13. Second cylinder; 14. First fixed roller; 15. Lower pressure roller; 16. Second fixed roller. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0037] The present application provides a U-shaped axially limited three-roller plate bending device, such as Figures 4 to 6 As shown, it includes a roller mechanism and a limiting mechanism.

[0038] The roller mechanism includes a frame, a first fixed roller 14 and a second fixed roller 16 connected to the frame, and a lower pressure roller 15 movably connected to the top of the frame. A roller bending area is between the fixed rollers and the lower pressure roller 15. The roller bending area is used to place the fan-shaped plate 4 inside, and then adjust the size of the roller bending area by adjusting the height of the lower pressure roller 15, so as to roll-form fan-shaped plates 4 of various specifications.

[0039] The limiting mechanism is clamped between the fixed roller and the lower pressure roller 15, and includes an inner limiting portion and an outer limiting portion, and is respectively arranged on both sides of the roller mechanism axial direction in the roller bending area to limit the displacement of the sector plate 4 along the axial direction of the roller mechanism.

[0040] like Figure 7 and Figure 8 As shown, the inner limit part includes an inner limit slider 3, which is connected to one end of the frame as a fixed part, and the inner limit slider 3 has a double arc surface on the side in contact with the fan-shaped plate 4, which is used to abut against the inner arc surface of the fan-shaped plate 4 after being tangent. Fig. 9 As shown, the outer limiting part includes an outer limiting slider 5, and the side of the outer limiting slider 5 in contact with the fan-shaped plate 4 is a double arc surface, which is used to abut against the outer arc surface of the fan-shaped plate 4 after being tangent to limit the fan-shaped plate 4.

[0041] like Fig.10 As shown, when the present application is in use, the position of the sector plate 4 along the axial direction of the roller mechanism during the roller bending process is well rigidly fixed by setting the limit mechanism, and the connecting lines of the contact positions of the inner limit part and the outer limit part with the sector plate 4 correspond to the radial direction of the sector plate 4. The sector plate 4 is fed along the tangential direction of the three rollers under the tangential friction force of the three rollers, so the speed of the sector plate 4 is v, and the direction is along the tangential direction of the three rollers. The speed can be decomposed into the speed v of the circular arc tangent direction of the sector plate 4 t With arc radial v a direction, where the velocity v in the radial direction of the arc a Blocked by the limit mechanism, the fan-shaped plate 4 finally only has a material arc tangent direction speed v t , so the fan-shaped plate 4 is always fed along the tangent direction of its arc.

[0042] It should be noted that the double arc surface includes a feed arc and a discharge arc. When the fan-shaped plate 4 is fed from the feed arc, the feed arc of the inner limit slider 3 and the discharge arc of the outer limit slider 5 are the points of action. When the fan-shaped plate 4 is fed from the discharge arc, the discharge arc of the inner limit slider 3 and the feed arc of the outer limit slider 5 are the points of action. Therefore, by changing the direction of roller bending by changing the rotation direction of the roller, the present application can realize the reciprocating roller bending of the conical shell ring and the curved plate, and control the roller bending speed by controlling the rotation speed of the roller.

[0043] like Fig.10 As shown, according to the processing comparison diagram of the sector plate 4 at three time points T1, T2 and T3, it is shown that the sector plate 4 remains tangent to the inner and outer limit sliders 5 at every moment in the roll bending process, and the direction of the deformation action line of the lower pressure roller 15 is always along the radius direction of the sector plate 4, so that the conical plate and the curved plate can achieve automatic roll bending.

[0044] The U-shaped axially limited three-roll plate bending device provided in the present application performs roll bending on the sector plate 4. The double arc surface of the inner limit slider 3 is tangent to the inner arc surface of the sector plate 4 and then abuts, and the sector plate 4 and the inner limit slider 3 are always connected through two tangent points. The double arc surface of the outer limit slider 5 is tangent to the outer arc surface of the sector plate 4 and then abuts, and the sector plate 4 and the outer limit slider 5 are always connected through two tangent points. The motion trajectory of the sector plate 4 can be determined through multiple tangent points, and the motion trajectory changes continuously with the arc surface of the sector plate 4. It can meet the limiting requirements of the sector plate 4 with different curvatures, and the double arc surface contacts the sector plate 4, which can avoid the limiting mechanism from causing damage to the arc surface of the sector plate 4. The present application has the advantages of simple structure, low manufacturing cost, good versatility, convenient operation, stable and reliable structure, can be widely promoted, is suitable for the roll bending process of conical shell rings and curved plates of different specifications, can realize automatic roll bending, improve production efficiency and product precision, and reduce the labor intensity of workers.

[0045] In one embodiment, the two double arc surfaces are arranged along the feeding direction of the fan-shaped plate 4, so that the fan-shaped plate 4 passes through the two double arc surfaces in sequence. Consider changing the feeding direction of the fan-shaped plate 4 along the arc surface of the fan-shaped plate 4 to avoid manually rotating the fan-shaped plate 4 at an angle, realize automatic feeding of the fan-shaped plate 4, and improve work efficiency.

[0046] In one embodiment, a U-shaped groove is provided at the top of the inner limit slider 3 and the outer limit slider 5, and the top of the inner limit slider 3 and the outer limit slider 5 are assembled and connected with the bottom of the lower pressure roller 15 through the U-shaped groove, so that the lower pressure roller 15 matches the U-shaped groove and rotates in the U-shaped groove. The distance between the bottom of the U-shaped groove and the lowest point of the limit slider is the minimum thickness requirement of the sector plate 4. It is considered that by setting the U-shaped groove, the distance between the bottom of the U-shaped groove and the lowest point of the limit slider is reduced to adapt to various plate specifications.

[0047] In one embodiment, the U-shaped groove includes a vertical area and an arc area, the diameter of the arc area corresponds to the pressing roller 15, and the height of the vertical area corresponds to the range of the pressing distance of the pressing roller 15. After completing one roll bending, the height of the pressing roller 15 is adjusted to change the height of the pressing roller 15 in the vertical area of ​​the U-shaped groove, and then the sector plate 4 is rolled again. After multiple roll bendings with different pressing distances, the roll bending of the conical shell ring is finally achieved, and the roll bending of the conical shell ring or curved plate with different curvature requirements is met.

[0048] It should be noted that hoisting holes are provided at both ends of the inner limit slider 3 and the outer limit slider 5 to facilitate the hoisting of the limit sliders, making the present application more time-saving and labor-saving during assembly.

[0049] In one embodiment, the inner limit portion is a fixed portion, and the outer limit portion is a sliding portion. The outer limit portion is slidably connected to the other end of the frame, and the outer limit portion further comprises a cylinder, the output shaft of the cylinder is connected to the outer limit slider 5 through the outer limit push rod, and the cylinder is used to control the outer limit slider 5 to slide along the axial direction of the roller mechanism, and adjust the distance between the inner limit portion and the outer limit portion to adapt to sector plates 4 of different widths.

[0050] It should be noted that the outer limit push rod is detachably connected to the outer limit slide block 5 through a thread. When the cylinder stroke is not enough, different movement strokes can be achieved by replacing the outer limit push rods of different lengths.

[0051] In one embodiment, Fig. 9 As shown, the outer limit slider 5 is symmetrically provided with two outer limit push rods along the axial direction of the roller mechanism, namely, a first outer limit push rod 6 and a second outer limit push rod 11. The first outer limit push rod 6 is connected to the first cylinder 8, and the first cylinder 8 is connected to the frame through the first cylinder base 7. The second outer limit push rod 11 is connected to the second cylinder 13, and the second cylinder 13 is fixedly connected to the frame through the second cylinder base 12. Considering that the arrangement of two sets of outer limit push rods and cylinders can increase the stability of the outer limit part when sliding, and in the process of roller bending, the outer limit part can guide the sector plate 4 smoothly.

[0052] Specifically, the selection of the cylinder should be based on the simulation calculation results of the working axial load, so that the cylinder can ensure sufficient axial pressure bearing capacity.

[0053] It should be noted that the first cylinder 8 and the second cylinder 13 are symmetrically arranged along the axial direction of the roller mechanism, the bottom surface of the cylinder base is rigidly connected to the frame through four bolts, and the side surface of the cylinder base is rigidly connected to the cylinder through four screws, thereby realizing rigid fixation of the cylinder.

[0054] In one embodiment, the inner limit slider 3 and the outer limit slider 5 are symmetrically arranged on both sides of the axial direction of the roller mechanism. By symmetrical arrangement, the force on both sides of the sector plate 4 along its radial direction is uniform.

[0055] In one embodiment, two arc-shaped grooves are provided at the bottom of the inner limit slider 3 and the outer limit slider 5, and the diameter of the arc-shaped grooves is the same as that of the fixed roller, so that the tops of the two fixed rollers rotate in the two arc-shaped grooves respectively. The bottoms of the inner limit slider 3 and the outer limit slider 5 are allowed to fall freely on the tops of the two fixed rollers, and the two arc-shaped grooves are coated with pressure-resistant lubricating oil to maintain good sliding between the limit slider and the fixed roller. In addition, the displacement of the limit mechanism and the fixed roller is prevented to avoid the movement of the inner limit slider 3 and the outer limit slider 5 during the guiding process, thereby ensuring the guiding accuracy of the limit mechanism.

[0056] In one embodiment, the inner limit slider 3 is detachably connected to the frame via an inner limit push rod, and the length of the inner limit push rod is selected according to the width of the sector plate 4 .

[0057] Specifically, Figure 7 and Figure 8 As shown, the inner limit slider 3 is symmetrically provided with two inner limit push rods along the axial direction of the roller mechanism, including a first inner limit push rod 2 and a second inner limit push rod 9, which are connected to the frame through the two inner limit push rods, so as to improve the inner limit slider 3 to smoothly guide the sector plate 4. A third inner limit push rod 10 with a smaller diameter is also provided at the bottom of the inner limit slider 3 to connect with the frame to increase the connection rigidity between the frame and the inner limit slider 3.

[0058] In one embodiment, a force-bearing slider 1 is provided between the inner limit push rod 2 and the frame. The force-bearing slider 1 is freely fitted with the frame, and the force-bearing slider 1 is used to transfer the axial load of the inner limit slider 3 to the frame.

[0059] Specifically, a threaded countersunk hole is drilled axially of the force-bearing slider 1, and the threaded countersunk hole connects the inner limit push rod 2 to the force-bearing slider 1 through a thread, and can ensure that the fitting surface between the force-bearing slider 1 and the frame is flat.

[0060] It should be noted that the contact surfaces of the inner limit slider 3, the outer limit slider 5 and the three rollers are all coated with pressure-resistant lubricating oil, and a good sliding relationship is maintained between the three rollers. Lubricating oil is applied to the arc surface where the inner limit slider 3, the outer limit slider 5 and the fan-shaped plate 4 are connected, so as to make the transmission smoother and avoid the limit mechanism from causing damage to the arc surface of the fan-shaped plate 4.

[0061] Before use, the present application installs the limit mechanism between the first fixed roller 14, the second fixed roller 16 and the lower pressure roller 15. When it is necessary to roll-bend the conical shell ring or the curved plate, first assemble the inner limit part, and apply anti-pressure lubricating oil on the inner limit slider 3 of the inner limit part, then hoist the inner limit part so that it falls freely on the two fixed rollers, and finally push it along the axial direction until it fits with the frame. Then, hoist the sector plate 4 to the roller bending area, and adjust the feeding direction of the sector plate 4 so that it starts feeding from one end. Then assemble the outer limit part, and similarly apply anti-pressure lubricating oil on the outer limit slider 5 of the outer limit part, hoist it so that it falls freely on the two fixed rollers, and then fix the cylinder base on the frame, and finally power on the cylinder to drive it so that it pushes the outer limit slider 5 to clamp the sector plate 4. The three inner limit push rods are respectively passed through the force slider 1 until they are threadedly connected with the inner limit slider 3, and finally the inner limit push rods and the force slider 1 are respectively tightened with nuts until the nuts are completely inserted into the countersunk holes of the force slider 1. First, the cylinder is installed on the cylinder base with four bolts, and then the two outer limit push rods are respectively threadedly connected with the output shaft of the cylinder, and the other ends are respectively threadedly connected with the outer limit slider 5, thereby completing the assembly of the outer limit part.

[0062] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A U-shaped axially limited three-roll plate bending device, characterized in that: include: The roller mechanism comprises a frame, two fixed rollers connected to the frame, and a lower pressing roller movably connected to the top of the frame, a roller bending area is between the fixed rollers and the lower pressing roller, and the roller bending area is used to adjust the size of the roller bending area by adjusting the height of the fixed rollers after the fan-shaped sheet is placed inside, so as to perform roller forming on the fan-shaped sheets of various thicknesses; A limiting mechanism, the limiting mechanism is clamped between the fixed roller and the lower pressure roller, and comprises an inner limiting portion and an outer limiting portion, which are respectively arranged on both sides of the roller mechanism axial direction in the roller bending area, and are used to limit the displacement of the fan-shaped plate along the axial direction of the roller mechanism; The inner limit part includes an inner limit slider, which is connected to one end of the frame as a fixed part, and the inner limit slider has a double arc surface on one side in contact with the fan-shaped plate, which is used to abut against the inner arc surface of the fan-shaped plate after being tangent; the outer limit part includes an outer limit slider, which has a double arc surface on one side in contact with the fan-shaped plate, which is used to abut against the outer arc surface of the fan-shaped plate after being tangent to limit the fan-shaped plate.

2. The U-shaped axially limited three-roll plate bending device according to claim 1 is characterized in that: Each of the double arc surfaces comprises a feed arc and a discharge arc, and the feed arc and the discharge arc are arranged along the feed direction of the fan-shaped plate.

3. The U-shaped axially limited three-roll plate bending device according to claim 1 is characterized in that: A U-shaped groove is provided on the top of the inner limit slider and the outer limit slider, and the top of the inner limit slider and the outer limit slider are assembled and connected with the bottom of the lower pressure roller through the U-shaped groove, so that the lower pressure roller matches the U-shaped groove and rotates in the U-shaped groove.

4. The U-shaped axially limited three-roll plate bending device according to claim 3 is characterized in that: The U-shaped groove includes a vertical area and an arc area, the diameter of the arc area corresponds to the pressing roller, and the height of the vertical area corresponds to the range of the pressing distance of the pressing roller.

5. The U-shaped axially limited three-roll plate bending device according to claim 1 is characterized in that: The outer limit part is slidably connected to the other end of the frame, and the outer limit part also includes a cylinder. The output shaft of the cylinder is connected to the outer limit slider through an outer limit push rod. The cylinder is used to control the axial sliding of the outer limit slider along the roller mechanism and adjust the distance between the inner limit part and the outer limit part to adapt to fan-shaped plates of different specifications.

6. The U-shaped axially limited three-roll plate bending device according to claim 5 is characterized in that: Both sides of the outer limit sliding block in the width direction are respectively connected with outer limit push rods, each of the outer limit push rods is respectively connected with a cylinder, and each of the cylinders is fixedly connected with the frame through a cylinder seat.

7. The U-shaped axially limited three-roll plate bending device according to claim 1 is characterized in that: The inner limit slider and the outer limit slider are symmetrically arranged on two axial sides of the roller mechanism.

8. The U-shaped axially limited three-roll plate bending device according to claim 1 is characterized in that: Two arc-shaped grooves are arranged at the bottom of the inner limit sliding block and the outer limit sliding block, so that the tops of the two fixed rollers rotate in the two arc-shaped grooves respectively.

9. The U-shaped axially limited three-roll plate bending device according to claim 1 is characterized in that: The inner limit sliding block is detachably connected to the frame via an inner limit rod, and the length of the inner limit rod is selected according to the width of the sector plate.

10. The U-shaped axially limited three-roll plate bending device according to claim 9, characterized in that: A force-bearing slider is provided between the inner limit rod and the frame, and the force-bearing slider is used to transmit the axial force of the inner limit slider to the frame.

Images