Locking device for a straightening machine

Abstract

The utility model discloses a locking device of straightening machine, including roll box steel structure, swing frame, double -acting hydraulic cylinder and respectively setting in the drive connecting rod, swing connecting rod and swing hydraulic cylinder of double -acting hydraulic cylinder both sides, so can pass through each hydraulic cylinder transmission load force to realize automatically with roll box steel structure in transverse and longitudinal locking, positioning, and can quickly unlock roll box steel structure when changing roll, so can avoid the waste of the tedious and operation time that artificial operation brings, and then effectively improve the change roll efficiency.

Description

Technical Field

[0001] This utility model relates to the technical field of strip and plate rolling straightening machines, and in particular to a locking device for a straightening machine. Background Technology

[0002] In the production of hot-rolled and cold-rolled strip steel, the four-roll multi-roll straightener is a key piece of equipment for straightening strip shape. Its main function is to eliminate strip shape defects such as bending, wavy (e.g., edge waviness, center waviness), or warping caused by rolling, cooling, or coiling through alternating pressure from multiple rolls. This ensures that the straightness and dimensional accuracy of the strip steel meet the requirements of subsequent processing or end-use. The four-roll multi-roll straightener achieves strip straightening by locking the roll box with a swing frame and pressing it down. Therefore, how to automatically and stably lock the roll box is a problem that urgently needs to be solved in the strip straightening process. Utility Model Content

[0003] To address the aforementioned problems, this invention provides a locking device for a straightening machine. By transmitting load force through various hydraulic cylinders, the device automatically locks and positions the roller box steel structure in both the transverse and longitudinal directions. Furthermore, it can quickly unlock the roller box steel structure during roller changes, thus avoiding the tediousness and wasted time associated with manual operation and effectively improving roller changing efficiency.

[0004] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0005] This utility model provides a locking device for a straightening machine, including a roller box steel structure, a swing frame, a double-acting hydraulic cylinder, and drive connecting rods, swing connecting rods, and swing hydraulic cylinders respectively disposed on both sides of the double-acting hydraulic cylinder. The piston rods at both ends of the double-acting hydraulic cylinder are rotatably connected to one end of each of the two drive connecting rods. The other ends of the two drive connecting rods, away from the double-acting hydraulic cylinder, are rotatably connected to one end of their respective swing connecting rods. The middle portions of the two drive connecting rods are rotatably connected to the swing frame, forming a rotation fulcrum. The other ends of the two swing connecting rods, away from the drive connecting rods, are rotatably connected to their respective swing hydraulic cylinders. The ends of the two swing hydraulic cylinders near the swing frame are rotatably connected to both ends of the swing frame. Through the combined action of the double-acting hydraulic cylinder, the swing frame, the swing connecting rods, and the drive connecting rods, the piston rods of the swing hydraulic cylinders apply a restriction to the roller box steel structure, thereby forming a locking mechanism.

[0006] Furthermore, supports are provided at both ends of the swing frame away from the double-acting hydraulic cylinder, and the ends of the two swing hydraulic cylinders near the swing frame are rotatably connected to their corresponding supports through rotating pairs.

[0007] Furthermore, the swing frame is provided with fixed seats that are spaced apart and symmetrically distributed in the middle, and the middle parts of the two drive links are rotatably connected to the corresponding fixed seats through rotating pairs.

[0008] Furthermore, the lower end face of the roller box steel structure is provided with a groove, and the piston rod of the swing hydraulic cylinder can be detachably engaged in the groove to lock the roller box steel structure.

[0009] Furthermore, it also includes blocking blocks disposed on both sides of the double-acting hydraulic cylinder, the blocking blocks being used to limit the swing angle of the corresponding swing link.

[0010] This utility model also provides an analytical design method for a locking device applied to the above-mentioned straightening machine, comprising: considering the locking device as a planar linkage mechanism, and defining L1 as the length from the first end of the driving linkage to the rotation fulcrum, L2 as the length from the second end of the driving linkage to the rotation fulcrum, L3 as the length of the swing linkage, L4 as the distance from the connection point between the swing hydraulic cylinder and the swing linkage to the connection point between the swing hydraulic cylinder and the swing frame, L5 as the distance from the connection point between the swing hydraulic cylinder and the swing frame to the centerline of the swing frame, L6 as the distance from the connection point between the double-acting hydraulic cylinder and the driving linkage to the connection point between the swing hydraulic cylinder and the swing frame, α as the rotation angle of the driving linkage, β as the rotation angle of the swing hydraulic cylinder, and then deriving a function of α mapping to β based on geometric relationships:

[0011]

[0012] In equation (1), let variable α be assigned an interval [α1, α2]. Then, apply the Chern interval method to interpolate variable α within the interval [α1, α2]. The formula for calculating the interpolation point is as follows:

[0013]

[0014] In equation (2), M is the number of interpolation nodes. Given the interval [β1,β2], and combined with the constraints, L1 to L7 are given.

[0015] Furthermore, the thrust of the double-acting hydraulic cylinder is defined as F1, and the thrust of the swing hydraulic cylinder is defined as F2, and the following is derived based on torque balance:

[0016] F1(L1sinα)=F2(L3cosδ+L2sinα), (3);

[0017] Then, based on the locking load requirements of the roller box steel structure, F2 is determined first, and then F1 is calculated according to formula (3);

[0018] Then, based on the hydraulic cylinder strokes of F1, F2, and various different models of double-acting hydraulic cylinders and swing hydraulic cylinders, the final selection model of the double-acting hydraulic cylinder and the swing hydraulic cylinder is determined.

[0019] The technical solution provided by this utility model has the following beneficial effects:

[0020] By transmitting load force through various hydraulic cylinders, the roller box steel structure is automatically locked and positioned in the horizontal and vertical directions. The roller box steel structure can be quickly unlocked when changing rollers, thus avoiding the tediousness and wasted time caused by manual operation, thereby effectively improving the roller changing efficiency. Attached Figure Description

[0021] Figure 1 The figure shown is a cross-sectional view of the locking device of the straightening machine in the embodiment;

[0022] Figure 2 The diagram shown is a geometric description of the analytical design method in the embodiment.

[0023] Figure 3 The diagram shown is a force analysis diagram of each hydraulic cylinder in the embodiment. Detailed Implementation

[0024] To further illustrate the various embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention and are mainly used to illustrate the embodiments, and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these drawings, those skilled in the art should be able to understand other possible implementations and the advantages of the present invention. The components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0025] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0026] Reference Figures 1 to 3 This embodiment provides a locking device for a straightening machine (hereinafter referred to as the locking device), including a roller box steel structure 7, a swing frame 3, a double-acting hydraulic cylinder 1, and a drive connecting rod 2, a swing connecting rod 5, a swing hydraulic cylinder 4, and a blocking block 6 respectively disposed on the left and right sides of the double-acting hydraulic cylinder 1. The two blocking blocks 6 are used to limit the swing angle of the corresponding swing connecting rod 5.

[0027] like Figure 1As shown, the piston rods at the left and right ends of the double-acting hydraulic cylinder 1 are rotatably connected to the first ends of the two drive rods 2 via revolute joints. The second ends of the two drive rods 2, away from the double-acting hydraulic cylinder 1, are rotatably connected to the first ends of the corresponding swing rods 5 via revolute joints. The middle parts of the two drive rods 2 are rotatably connected to the swing frame 3 via revolute joints and form a rotation fulcrum. The second ends of the two swing rods 5, away from the drive rods 2, are rotatably connected to the corresponding swing hydraulic cylinders 4 via revolute joints. The upper ends of the two swing hydraulic cylinders 4, near the swing frame 3, are rotatably connected to the left and right ends of the swing frame 3 via revolute joints.

[0028] The double-acting hydraulic cylinder 1, the swing frame 3, the swing connecting rod 5 and the drive connecting rod 2 work together to restrict the piston rod of the swing hydraulic cylinder 4 on the roller box steel structure 7, thereby forming a locking setting.

[0029] In this embodiment, the left and right ends of the swing frame 3 away from the double-acting hydraulic cylinder 1 are respectively provided with supports 31. The upper ends of the two swing hydraulic cylinders 4 are respectively rotatably connected to the corresponding supports 31 through a rotating joint. The middle part of the swing frame 3 is provided with fixed seats 32 that are spaced apart and symmetrically distributed. The middle parts of the two drive connecting rods 2 are respectively rotatably connected to the corresponding fixed seats 32 through a rotating joint and form a rotation fulcrum.

[0030] In addition, the lower end face of the roller box steel structure 7 is provided with multiple grooves 71, and the piston rods of the two swing hydraulic cylinders 4 can be separably engaged with the corresponding grooves 71 to lock the roller box steel structure 7.

[0031] When a roller needs to be changed, the piston rod of the double-acting hydraulic cylinder 1 retracts, pulling the drive connecting rods 2 located on both sides of it. The two drive connecting rods 2 drive the corresponding swing connecting rods 5 respectively. The two swing connecting rods 5 drive the corresponding swing hydraulic cylinders 4 to swing outward at a certain angle to move away from their respective grooves 71 and unlock the roller box steel structure 7. Then, it is pulled out by the external roller changing device.

[0032] When it is necessary to lock the roller box steel structure 7, the piston rod of the double-acting hydraulic cylinder 1 extends and pushes the drive connecting rods 2 located on both sides respectively. The two drive connecting rods 2 drive the corresponding swing connecting rods 5 respectively. The two swing connecting rods 5 drive the corresponding swing hydraulic cylinders 4 to swing inward at a certain angle to the vertical direction. Then the piston rods of the two swing hydraulic cylinders 4 retract and engage with the grooves 71 on the roller box steel structure 7 to lock the roller box steel structure 7.

[0033] In summary, by transmitting load force through various hydraulic cylinders, the roller box steel structure 7 is automatically locked and positioned in the horizontal and vertical directions, and the roller box steel structure 7 can be quickly unlocked when changing rollers. This avoids the tediousness and waste of time caused by manual operation, thereby effectively improving the efficiency of changing rollers.

[0034] In addition, this embodiment provides an analytical design method based on a locking device, specifically including:

[0035] like Figure 2 As shown, the locking device is first considered as a planar linkage mechanism. L1 is defined as the length from the first end of the driving link 2 to the rotation fulcrum, L2 as the length from the second end of the driving link 2 to the rotation fulcrum, L3 as the length of the swing link 5, L4 as the distance from the connection point between the swing hydraulic cylinder 4 and the swing link 5 to the connection point between the swing hydraulic cylinder 4 and the swing frame 3, L5 as the distance from the connection point between the swing hydraulic cylinder 4 and the swing frame 3 to the center line of the swing frame 3, L6 as the distance from the connection point between the double-acting hydraulic cylinder 1 and the driving link 2 to the connection point between the swing hydraulic cylinder 4 and the swing frame 3, α as the rotation angle of the driving link 2, β as the rotation angle of the swing hydraulic cylinder 4, and δ as the angle formed by the line connecting the connection points between the driving link 2 and the swing link 5 and the connection point between the swing link 5 and the swing hydraulic cylinder 4, and the horizontal line. Then, based on geometric relationships, the following can be derived:

[0036]

[0037] L6+L2sinα+L3cosδ-L4sinβ=(L6-

[0038] L1sinα)+L7.

[0039] Combining the above two equations to eliminate δ, we can then derive the function that maps α to β:

[0040]

[0041] In equation (1), let variable α be assigned an interval [α1, α2]. Apply the Chern interval method to interpolate variable α within the interval [α1, α2]. The formula for calculating the interpolation point is as follows:

[0042]

[0043] In equation (2), M is the number of interpolation nodes, and given the interval [β1,β2], combined with the constraints, L1~L7 are given.

[0044] like Figure 3 As shown, at the same time, the thrust of the double-acting hydraulic cylinder 1 is defined as F1, and the thrust of the swing hydraulic cylinder 4 is defined as F2, and the following is derived based on torque balance:

[0045] F1(L1sinα)=F2(L3cosδ+L2sinα), (3).

[0046] Then, based on the locking load requirements of the roller box steel structure 7, F2 is determined first, and then F1 is calculated according to formula (3).

[0047] Then, based on the hydraulic cylinder strokes of F1, F2, and various models of double-acting hydraulic cylinder 1 and swing hydraulic cylinder 4, the final selection models of double-acting hydraulic cylinder 1 and swing hydraulic cylinder 4 are determined.

[0048] Therefore, by performing analytical calculations on the geometric relationship of the locking device, a planar linkage mechanism that meets the predetermined input / output requirements is designed.

[0049] Force analysis is performed based on the results of analytical geometric calculations, and hydraulic cylinders are selected based on the results of the force analysis.

[0050] By locking the swing frame 3 and the roller box steel structure 7, stable pressing is ensured when the strip is straightened by the straightener, and the roller box can be changed quickly and unmanned.

[0051] Although the present invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the present invention without departing from the spirit and scope of the present invention as defined in the appended claims, and all such changes shall be within the scope of protection of the present invention.

Claims

1. A locking device for a straightening machine, characterized in that: It includes a roller box steel structure, a swing frame, a double-acting hydraulic cylinder, and a drive connecting rod, a swing connecting rod, and a swing hydraulic cylinder respectively disposed on both sides of the double-acting hydraulic cylinder; The piston rods at both ends of the double-acting hydraulic cylinder are rotatably connected to one end of two drive connecting rods. The other ends of the two drive connecting rods away from the double-acting hydraulic cylinder are rotatably connected to one end of the corresponding swing connecting rod. The middle parts of the two drive connecting rods are rotatably connected to the swing frame and form a rotation fulcrum. The other ends of the two swing connecting rods away from the drive connecting rods are rotatably connected to the corresponding swing hydraulic cylinders. The ends of the two swing hydraulic cylinders near the swing frame are rotatably connected to both ends of the swing frame. The double-acting hydraulic cylinder, the swing frame, the swing linkage, and the drive linkage work together to restrict the piston rod of the swing hydraulic cylinder on the roller box steel structure, thereby forming a locking mechanism.

2. The locking device of the straightening machine according to claim 1, characterized in that: The swing frame is provided with supports at both ends away from the double-acting hydraulic cylinder, and the two swing hydraulic cylinders are rotatably connected to their corresponding supports at the ends near the swing frame through rotating pairs.

3. The locking device of the straightening machine according to claim 1, characterized in that: The swing frame has fixed seats arranged in a symmetrical and spaced manner in the middle, and the middle parts of the two drive links are rotatably connected to the corresponding fixed seats through a rotating joint.

4. The locking device of the straightening machine according to claim 1, characterized in that: The lower end face of the roller box steel structure is provided with a groove, and the piston rod of the swing hydraulic cylinder can be detachably engaged in the groove to lock the roller box steel structure.

5. The locking device of the straightening machine according to any one of claims 1-4, characterized in that: It also includes blocking blocks disposed on both sides of the double-acting hydraulic cylinder, the blocking blocks being used to limit the swing angle of the corresponding swing link.

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