Roller straightening machine and roller changing method thereof

Abstract

The present application belongs to the technical field of roller straightening machine, and relates to a roller straightening machine and a roller changing method thereof. One side of a roller box is fixedly provided with a positioning pin arranged horizontally along the Y direction, and a roller changing bracket is arranged on the transmission side of a straightening machine frame. The roller changing bracket comprises a seat guide rod, a movable bracket and a positioning block. The seat guide rod is arranged along the Z direction. The movable bracket is arranged on the seat guide rod and is slidably connected with the seat guide rod. A positioning hole is arranged on the positioning block for mounting the positioning pin. The positioning pin is positioned in the Z direction and the X direction of the roller box by cooperation with the positioning hole. A plurality of through holes are arranged on the movable bracket, and one intermediate coupling is arranged in each through hole. One end of the intermediate coupling is detachably connected with a work roller of the roller box through spline cooperation, and the other end is connected with a ball tooth coupling of a driving end of the straightening machine. The present application adopts transportation segmented speed control, and automatically judges whether the roller is in place through photoelectric detection, so as to improve the roller changing efficiency and the automation level.

Description

Technical Field

[0001] This invention belongs to the technical field of roller straighteners and relates to a roller straightener and its roller changing method. Background Technology

[0002] Roller straighteners are key equipment in the sheet and strip shape straightening process, widely used in sheet and strip heat treatment units, finishing units, and cross-cutting or slitting units, playing a decisive role in the final sheet and strip shape quality. In engineering applications, the connection between each work roll in the roller box and the coupling is usually achieved using a flat key or spline. For high-strength sheet and strip straighteners that transmit large torques, involute spline connections are typically used.

[0003] After a period of use, the working rolls of a roller straightener need to be replaced due to wear. With the increasing level of intelligence in the metallurgical industry, the automation level of roller straightener operation is also rising. Therefore, the replacement of roller boxes should also be semi-automatic or automated. Currently, due to differences in equipment configuration, the replacement time for some roller straighteners in China can be as high as 8 to 16 hours, while even those with higher automation levels still require about 1 hour.

[0004] The main function of the intermediate coupling is to transmit the torque provided by the main drive motor of the straightener to each work roll of the straightener through the gear distribution box and the ball gear coupling. However, traditional intermediate couplings use rigid connections, which are inconvenient to disassemble and assemble, affecting the efficiency of roll changing. Summary of the Invention

[0005] In view of this, the purpose of this invention is to solve the problem of disassembly efficiency during roll changing, and to provide a roll straightener and its roll changing method, which helps to achieve rapid roll changing smoothly.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A roller straightening machine includes a straightening machine frame and two roller boxes arranged vertically within the straightening machine frame. A positioning pin is fixed to one side of each roller box and arranged horizontally along the Y-axis. A roller changing bracket is provided on the transmission side of the straightening machine frame. The roller changing bracket includes a seated guide rod, a movable bracket, and a positioning block. The seated guide rod is arranged along the Z-axis. The movable bracket is mounted on the seated guide rod and slidably connected to it. The positioning block is fixed to the movable bracket. A positioning hole is provided on the positioning hole for installing the positioning pin. The positioning pin achieves Z-axis and X-axis positioning of the roller box by cooperating with the positioning hole.

[0008] The movable bracket is also provided with multiple through holes, each through hole containing an intermediate coupling. One end of the intermediate coupling is detachably connected to the working roller of the roller box via a spline engagement, and the other end is connected to the ball gear coupling at the main power end of the straightener.

[0009] Wherein, X is the running direction of the steel plate being straightened, Y is the direction of the axis of the working roller of the straightener, and Z is the height direction.

[0010] Furthermore, the straightener frame is provided with an internal track arranged along the Y direction for disassembling and assembling the transport roller box; guide plates are provided on both sides of the roller box located on the lower side, and side guide plates corresponding to the guide plates are provided on both sides of the straightener frame. The roller box is guided and positioned in the X direction by the cooperation of the guide plates and the side guide plates.

[0011] Furthermore, the intermediate coupling includes a splined shaft, a splined sleeve, a spring, and a locking sleeve; both ends of the splined shaft are provided with splines, the splined sleeve is fitted onto one end of the splined shaft, one end of the splined sleeve is connected to the splined shaft via a spline engagement, and the other end is connected to the work roller shaft end via a spline; the other end of the splined shaft is connected to the ball gear coupling of the straightener via a spline.

[0012] The splined shaft is provided with a limiting boss. The locking sleeve and the splined sleeve are respectively located on both sides of the limiting boss. The locking sleeve is fitted onto the splined shaft and abuts against one end of the limiting boss. The spring is located between the limiting boss and the splined sleeve. One end of the spring abuts against the end face of the splined sleeve, and the other end abuts against the end face of the limiting boss. The splined sleeve and the locking sleeve are connected by a tension bolt, and the splined sleeve can slide unidirectionally towards the locking sleeve.

[0013] Furthermore, the locking sleeve is provided with a through hole, and the tensioning bolt is slidably disposed in the through hole. The head of the tensioning bolt is located on the side of the locking sleeve away from the limiting boss, and the tail of the tensioning bolt is connected to the spline sleeve by a thread.

[0014] Furthermore, a disc spring is provided between the head of the tensioning bolt and the limiting boss for buffering the movement of the tensioning bolt; a nut is provided at the tail of the tensioning bolt, and the screwing depth of the tensioning bolt is adjusted by the nut, thereby changing the initial compression of the spring.

[0015] Furthermore, the locking sleeve has a split structure, including two semi-circular locking plates, which are connected as one piece by bolts.

[0016] Furthermore, the splined shaft is provided with a shoulder, and the shoulder is provided with a needle roller bearing and a thrust bearing. The splined shaft is rotatably connected to the movable bracket through the needle roller bearing. The thrust bearing is located between the shoulder and the movable bracket and is used to bear axial force.

[0017] A method for changing rolls in a roller straightener includes a roll changing device on one side of the straightener frame. The roll changing device includes a geared motor, a roll changing trolley, a traction mechanism, and a roll changing track. The roll changing track is located on one side of the straightener frame and connects to an internal track. The roll changing trolley is slidably mounted on the roll changing track and is connected to the geared motor via the traction mechanism. The roll changing trolley moves along the roll changing track under the drive of the geared motor. The roll changing trolley is connected to a roll box via a pin and transports the roll box in and out of the straightener frame.

[0018] During roll changing, the old roll box is pulled out by the roll changing trolley. After the old roll box is separated from the intermediate coupling, it moves out along the roll changing track. Then, the roll changing trolley moves the new roll box into the straightening machine frame. The roll box is guided and aligned in the X direction by the guide liners on both sides of the roll box contacting the side guide liners in the straightening machine frame. Then, the roll box is positioned in the Z direction by the positioning pins on the roll box and the positioning holes on the positioning blocks, so that the working roll of the roll box is connected to the intermediate coupling through the spline.

[0019] Furthermore, before changing the roller, a photoelectric detection device is installed on the movable bracket. The device detects whether the head of the tension bolt of the intermediate coupling is blocking the photoelectric detection device to determine whether the intermediate coupling and the roller box are fully assembled and aligned. When the photoelectric detection device detects the head of the tension bolt, at least one intermediate coupling and the working roller of the roller box are not properly assembled.

[0020] Furthermore, a position detection device is installed on the roll changing track to detect the position of the roll changing trolley, thereby enabling segmented control of the trolley's running speed; the segmented speed control method for the roll changing trolley is as follows:

[0021] The operating range of the roll changing trolley is divided into a high-speed section and a low-speed section. In the high-speed section, the distance between the roll box and the positioning block is ≥100mm, and in the low-speed section, the distance between the roll box and the positioning block is <100mm. The operating speed of the roll changing trolley in the high-speed section is greater than that in the low-speed section. In the low-speed section, the matching relationship between the speed n1 of the reduction motor of the roll changing device and the speed n2 of the main motor of the straightener is matched according to the following formula:

[0022]

[0023] in:

[0024] n1 - Speed ​​of the geared motor of the roller changing device, r / min;

[0025] i1 - Speed ​​ratio of the reduction motor in the roller changing device;

[0026] d1 - Pitch circle diameter of the sprocket in the roller changing device, in mm;

[0027] n2 - Main drive speed of the straightener, r / min;

[0028] i2 - Overall speed ratio of the main drive unit;

[0029] The number of teeth on the spline sleeve of the Z-intermediate coupling is the same as the number of teeth on the spline at the end of the work roller shaft.

[0030] k - the stiffness coefficient of the spring on the intermediate coupling, N / mm;

[0031] S0 - Initial compression of the spring after the intermediate coupling is assembled, in mm;

[0032] μ1 - the coefficient of friction between the spline sleeve and the spline shaft;

[0033] R1 - Spline shaft pitch circle radius, mm;

[0034] μ2 - coefficient of friction of the working roll bearing;

[0035] R2 - Equivalent radius of the work roll bearing, mm;

[0036] G - Weight of the work roll, N;

[0037] By controlling the matching speed of the reduction motor of the roller changing device and the main motor of the straightener, the spline sleeve of the intermediate coupling can achieve rapid spline alignment with the working roller of the roller box during its rotation.

[0038] The beneficial effects of this invention are as follows:

[0039] 1. This invention, by setting up a center alignment and positioning mechanism on the straightener to control the spline shaft of the working roll and the spline sleeve on the intermediate coupling in the height direction (Z direction) and horizontal direction (X direction), and by constraining the intermediate coupling in the Y direction, and by utilizing the fact that the working roll does not rotate while the intermediate coupling rotates at a low speed, can quickly realize the semi-automatic or even automatic replacement operation of the old and new roll boxes, which can significantly improve the intelligence level of the straightener operation, save time and labor, and greatly improve the roll changing efficiency of the straightener.

[0040] 2. In the transmission system of the straightener, this invention establishes an intermediate coupling between the ball-tooth coupling and the straightener's work roll, and installs a spring-loaded spline sleeve on the intermediate coupling. During roll changes, the spring mechanism effectively prevents the spline sleeve from being jammed by the external spline at the work roll shaft end, thus avoiding damage to the equipment. Once the external spline teeth on the work roll are correctly engaged with the internal spline teeth of the spline sleeve, the preload of the spring during assembly maintains the correct installation position between them, ensuring reliable transmission of the straightening torque and featuring low impact and low noise during operation.

[0041] 3. This invention divides the running section of the roll changing trolley into high-speed and low-speed sections. The high-speed section allows for higher speed operation, effectively reducing roll changing time. A photoelectric detection device checks whether each work roll is correctly engaged with its corresponding intermediate coupling and sends the signal to the electrical control system. The electrical control system then issues corresponding control requirements, achieving automation.

[0042] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0043] To make the objectives, technical solutions, and advantages of the present invention clearer, the preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, wherein:

[0044] Figure 1 This is a schematic diagram of the roller straightening machine working roller changing operation method of the present invention.

[0045] Figure 2 for Figure 1 The right view.

[0046] Figure 3 for Figure 2 AA view in the middle.

[0047] Figure 4 This is an axial view of the working rollers of the upper and lower roller boxes.

[0048] Figure 5 This is a structural diagram of the intermediate coupling.

[0049] Figure 6 This is a layout diagram for detecting the travel position of the roller changing trolley.

[0050] Figure 7 This is a schematic diagram of the intermediate coupling installation. Detailed Implementation

[0051] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0052] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the invention. To better illustrate the embodiments of the invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0053] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present invention. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0054] For ease of explanation, the working roll changing bracket of a typical 15-roll straightener is used as an example. This invention is not limited to straighteners with 15 rolls, but is also applicable to roller straighteners with other roll numbers. For example, conventional roller straighteners with 5 to 21 rolls can also use this method to achieve rapid roll changing.

[0055] like Figure 1 As shown, the present invention mainly includes: a straightening machine frame 1, a lower roller box guide liner 2, a roller changing device 3, an upper roller changing bracket 4, a lower roller changing bracket 5, an upper roller box Z-direction positioning pin 6, a lower roller box Z-direction positioning pin 7, an intermediate coupling 8, a photoelectric detection device 9, a ball gear coupling 10, and a position detection device 11.

[0056] The straightener frame 1 has side guide plates 1-1 on its inner side, which cooperate with the guide plates 2 arranged on the lower roller box to control the correct positioning of all working rollers in the upper and lower roller boxes along the X direction. The spacing dimension A1 between the side guide plates 1-1 on both sides of the straightener frame 1 is equal to the spacing dimension A2 between the guide plates 2 on both sides of the lower roller box. Figure 2 and 4 As shown.

[0057] The straightener frame 1 is equipped with internal tracks 1-2 for the upper and lower roller boxes to enter the straightener frame 1. Mechanical stops 1-3 are installed on the transmission side of the straightener frame 1 to control the extreme positions of the upper and lower roller boxes entering the straightener frame 1.

[0058] The roller changing device 3 includes a geared motor 3-1, a roller changing trolley 3-2, a traction mechanism 3-3, a roller changing track 3-4, and a pin 3-5. The geared motor 3-1 provides driving force for the roller changing operation and adopts frequency conversion control. The roller changing trolley 3-2 is connected to the lower roller box through the pin 3-5 and drives the roller box to move back and forth along the roller changing track 3-4 through the traction mechanism 3-3.

[0059] The upper roll changing bracket 4 includes an upper seat guide rod 4-1, an upper movable bracket 4-2, and an upper Z-axis positioning block 4-3. The upper seat guide rod 4-1 is mounted on the straightener frame 1, located on the drive side of the straightener. During roll changing, it is in a fixed state (in normal straightener operation, the upper seat guide rod 4-1 slides with the upper movable bracket 4-2, thus being in a relatively free state relative to the straightener frame 1). It is used to constrain and position the upper movable bracket 4-2 in the X and Y directions, and to adjust the Z-axis position of the upper movable bracket 4-2 during roll changing. The upper seat guide rod 4-1 has two guide rods on its left and right sides, and a support plate is provided at the lower end of the upper guide rod, with the support plate pressing upward against the upper movable bracket 4-2.

[0060] The upper movable bracket 4-2 has multiple horizontal through holes in the middle (seven in this example) for mounting the intermediate coupling 8. Vertical guide holes are provided on both sides of the upper bracket, through which the upper seated guide rod 4-1 passes, allowing the upper movable bracket to slide up and down relative to the upper seated guide rod. The upper Z-axis positioning block 4-3 is mounted on the upper movable bracket 4-2, with a height positioning dimension of H1', ​​and slides synchronously up and down with the upper movable bracket 4-2.

[0061] The lower roller support 5 includes a lower belt seat guide rod 5-1, a lower movable support 5-2, and a lower Z-axis positioning block 5-3. The lower belt seat guide rod 5-1 is also fixed on the straightener frame 1 and is arranged on the transmission side. Two guide rods are provided on its left and right sides, which pass through the vertical guide holes on both sides of the lower movable support 5-2 from bottom to top.

[0062] The lower movable bracket 5-2 has multiple horizontal through holes in the middle (eight in this example) for mounting the intermediate coupling 8. Vertical guide holes are provided on both sides of the lower bracket. The lower seat guide rod 5-1 passes through the guide holes from bottom to top, allowing the lower movable bracket 5-2 to slide vertically relative to the guide rod. The lower Z-axis positioning block 5-3 is mounted on the lower movable bracket 5-2, with a height positioning dimension of H2', and slides synchronously up and down with the lower movable bracket 5-2.

[0063] like Figure 1 and Figure 4 As shown, the Z-axis positioning pin 6 of the upper roller box is set on the transmission side of the upper roller box and arranged on both sides. Before changing the roller, it is necessary to ensure that its positioning dimension H1 is equal to its dimension H1', ​​that is: H1=H1'.

[0064] Similarly, the Z-direction positioning pin 7 of the lower roller box is set on the transmission side of the lower roller box and arranged on both sides. Before changing the roller, it is necessary to ensure that its positioning dimension H2 is equal to its dimension H2', that is: H2=H2'.

[0065] like Figure 5 , 7 As shown, the intermediate coupling 8 is used to connect the working roll of the straightener and the ball gear coupling 10, and transmits the torque provided by the main drive of the straightener to the working roll. The intermediate coupling 8 is mainly composed of a spline sleeve 8-1, a spring 8-2, a locking sleeve 8-3, a tension bolt 8-4, and a spline shaft 8-5.

[0066] Both ends of the spline shaft 8-5 are provided with splines. The spline sleeve 8-1 is fitted onto one end of the spline shaft 8-5. One end of the spline sleeve 8-1 is connected to the spline shaft 8-5 through a spline engagement, and the other end is connected to the work roller shaft end spline. The other end of the spline shaft 8-5 is connected to the ball gear coupling 10 of the straightener through a spline.

[0067] A limiting boss is provided on the spline shaft 8-5. The locking sleeve 8-3 and the spline sleeve 8-1 are located on both sides of the limiting boss. The locking sleeve 8-3 is fitted onto the spline shaft 8-5 and abuts against one end of the limiting boss. The spring 8-2 is located between the limiting boss and the spline sleeve 8-1. One end of the spring 8-2 abuts against the end face of the spline sleeve 8-1, and the other end abuts against the end face of the limiting boss. The spline sleeve 8-1 and the locking sleeve 8-3 are connected by a tension bolt 8-4, and the spline sleeve 8-1 can slide unidirectionally toward the locking sleeve 8-3.

[0068] The locking sleeve 8-3 is provided with a through hole, and the tension bolt 8-4 is slidably disposed in the through hole. The head of the tension bolt 8-4 is located on the side of the locking sleeve 8-3 away from the limiting boss, and the tail of the tension bolt 8-4 is connected to the spline sleeve 8-1 by a thread.

[0069] A disc spring is provided between the head of the tension bolt 8-4 and the limiting boss for buffering the movement of the tension bolt 8-4; a nut is provided at the tail of the tension bolt 8-4, and the screwing depth of the tension bolt 8-4 is adjusted by the nut, thereby changing the initial compression of the spring 8-2.

[0070] The locking sleeve 8-3 has a split structure, including two semi-circular locking plates, which are connected as one piece by bolts.

[0071] The splined shaft 8-5 is provided with a shoulder, on which a needle roller bearing 8-6 and a thrust bearing 8-7 are provided. The splined shaft 8-5 is rotatably connected to the upper movable bracket 4-2 through the needle roller bearing 8-6. The thrust bearing 8-7 is installed between the shoulder and the upper movable bracket 4-2 to bear axial force.

[0072] All intermediate couplings 8 are mounted on the upper movable bracket 4-2 and the lower movable bracket 5-2 respectively, and are structurally identical; the intermediate couplings 8 are connected to the work rollers and the ball gear couplings 10 by involute splines (DIN5480).

[0073] like Figure 2 and 3 As shown, there are two sets of photoelectric detection devices 9, which are installed on the upper movable bracket 4-2 and the lower movable bracket 5-2 respectively. On the side near the upper and lower roller boxes, there is a switch detection bracket 9-1, a photoelectric switch 9-2, a reflector 9-3, and a reflector bracket 9-4.

[0074] like Figure 6 As shown, the position detection device 11 mainly consists of a front stop position detection switch 11-1, a high / low speed switching position detection switch 11-2, a switch bracket (I) 11-3, a rear stop position detection switch 11-4, a switch bracket (II) 11-5, and a sensing plate 11-6. The sensing plate 11-6 is installed on the side of the roll changing trolley 3-2. During roll changing, when the sensing plate 11-6 senses the corresponding proximity switch as the roll changing trolley 3-2 moves, it will send a corresponding signal to the control system and perform a corresponding action, such as stopping at the front position, switching between high and low speeds, or stopping at the rear position.

[0075] The running range of the roller changing trolley is divided into a high-speed section and a low-speed section. In the high-speed section, the distance between the roller box and the positioning block is ≥100mm, and in the low-speed section, the distance between the roller box and the positioning block is <100mm. The running speed of the roller changing trolley in the high-speed section is greater than that in the low-speed section.

[0076] The feed speed V (mm / s) of the roll changing trolley 3-2:

[0077]

[0078] in:

[0079] n1 - Speed ​​of the geared motor of the roller changing device, r / min;

[0080] i1 - Speed ​​ratio of the reduction motor in the roller changing device;

[0081] d1 - Pitch circle diameter of the sprocket in the roller changing device, in mm;

[0082] The time t(s) required for the spline sleeve on the intermediate coupling to rotate one tooth:

[0083]

[0084] in:

[0085] n2 - Main drive speed of the straightener, r / min;

[0086] i2 - Overall speed ratio of the main drive unit;

[0087] The number of teeth on the spline sleeve of the Z-intermediate coupling is the same as the number of teeth on the spline shaft at the end of the work roller shaft.

[0088] In the extreme case, the spline sleeve and the spline shaft are exactly misaligned by one tooth. The time t1 required for the spline sleeve to rotate when their tooth phases are equal (i.e., they can just fit together correctly, and the spline shaft at the work roller shaft end remains stationary before fitting) is:

[0089] t0 = t

[0090] In the extreme case, the travel distance S (mm) of the roller changing carriage during the process of the spline sleeve rotating one tooth relative to the spline shaft is:

[0091] S = Vt0

[0092] Under the condition of a travel distance of S, the maximum axial pressure F (N) on the spline shaft of the work roll is:

[0093] F = k(S + S0)

[0094] At this point, the spline shaft and spline sleeve are just at the critical point of being properly aligned, where:

[0095] k - The spring stiffness coefficient on the intermediate coupling, N / mm

[0096] S0 - Initial compression of the spring after the intermediate coupling is assembled, in mm.

[0097] Under pressure F, the spline sleeve causes the work roller to experience a circumferential torque T (N / mm):

[0098] T=Fμ1R1

[0099] in:

[0100] μ1 - the coefficient of friction between the spline sleeve and the spline shaft;

[0101] R1 - Spline shaft pitch circle radius, mm.

[0102] The static frictional resistance torque T' (N / mm) experienced by the working roll due to bearing friction:

[0103] T′=Gμ2R2

[0104] in:

[0105] μ2 - coefficient of friction of the working roll bearing;

[0106] R2 - Equivalent radius of the work roll bearing, mm;

[0107] G - Weight of the work roll, N.

[0108] During the low-speed section of the roll changing process, by matching the appropriate speed n1 of the roll changing geared motor and the main drive speed n2 of the straightener, it is ensured that the work roll remains stationary. This requires meeting the following conditions:

[0109] T′>T

[0110] At low speeds, the matching relationship between the speed n1 of the reduction motor of the roll changing device and the speed n2 of the main motor of the straightener is determined by the following formula:

[0111]

[0112] in:

[0113] n1 - Speed ​​of the geared motor of the roller changing device, r / min;

[0114] i1 - Speed ​​ratio of the reduction motor in the roller changing device;

[0115] d1 - Pitch circle diameter of the sprocket in the roller changing device, in mm;

[0116] n2 - Main drive speed of the straightener, r / min;

[0117] i2 - Overall speed ratio of the main drive unit;

[0118] The number of teeth on the spline sleeve of the Z-intermediate coupling is the same as the number of teeth on the spline at the end of the work roller shaft.

[0119] k - the stiffness coefficient of the spring on the intermediate coupling, N / mm;

[0120] S0 - Initial compression of the spring after the intermediate coupling is assembled, in mm;

[0121] μ1 - the coefficient of friction between the spline sleeve and the spline shaft;

[0122] R1 - Spline shaft pitch circle radius, mm;

[0123] μ2 - coefficient of friction of the working roll bearing;

[0124] R2 - Equivalent radius of the work roll bearing, mm;

[0125] G - Weight of the work roll, N.

[0126] By controlling the matching speed of the reduction motor of the roller changing device and the main motor of the straightener, the spline sleeve of the intermediate coupling can achieve rapid spline alignment with the working roller of the roller box during its rotation.

[0127] The specific operation for changing rollers is as follows:

[0128] Operation of old roller box:

[0129] When performing the old roller box removal operation, the upper roller changing bracket 4 and the lower roller changing bracket 5 should first be in the position of pushing in the new roller box. Then, the roller changing trolley 3-2 should be moved to the side of the upper and lower roller boxes located in the frame 1. The roller changing trolley 3-2 and the lower roller box should be connected together using the pin 3-5. Before starting the roller changing trolley 3-2 to move backward, the relevant safety locking mechanism should be opened first. Then, the roller changing device should be started to pull the old roller box out of the straightener frame 1. Subsequently, the old roller box should be lifted away from the roller changing track 3-4 using hoisting tools.

[0130] New roller operation:

[0131] Before starting the geared motor 3-1 and the main drive motor of the straightener, the operating speed V of the geared motor 3-1 in the high and low speed ranges and the operating speed n2 of the main drive motor of the straightener, determined by the aforementioned calculation method, are set in the electrical control system.

[0132] Start the main drive motor of the straightening machine, which will drive all intermediate couplings 8 to start rotating.

[0133] Start the reduction motor 3-1 of the roller changing device, and the roller changing trolley 3-2 pushes the upper and lower roller boxes into the straightening machine frame 1 quickly. The roller boxes are positioned in the X direction by the guide liner 2 of the lower roller box and the side guide liner 1-1, that is, all the working rollers in the upper and lower roller boxes are positioned in the X direction.

[0134] During the movement of the roll changing trolley 3-2, when the sensing plate 11-6 arranged on the roll changing trolley 3-2 senses the high-low speed switching position detection switch 11-2, the electrical control system will obtain a position signal and switch the roll changing trolley from high speed to the set low speed to move forward.

[0135] The roller changing trolley 3-2 pushes the upper and lower roller boxes to continue moving into the straightener frame 1. After moving a short distance (set to 30-50mm in this example), the upper roller box Z-direction positioning pin 6 and the lower roller box Z-direction positioning pin 7 begin to insert into the upper Z-direction positioning block 4-3 and the lower Z-direction positioning block 5-3 respectively. At this time, it is ensured that the center of all working rollers is aligned with the center of spline sleeve 8-1 on all intermediate couplings 8 in the Z direction.

[0136] Thus, the roll changing operation mechanically ensures that the centers of all working rolls in the upper and lower roll boxes and the centers of all intermediate couplings 8 are correctly positioned in the X, Y, and Z directions, preparing for the smooth progress of further roll changing operations.

[0137] Next, the roller changing trolley 3-2 pushes the upper and lower roller boxes further into the frame 1 by a small distance (in this example, it is set to about 10-20mm). The splined shafts at the ends of all the working rollers in the upper and lower roller boxes begin to contact the end face of the splined sleeve 8-1 on the intermediate coupling 8. At this time, two situations will occur simultaneously:

[0138] One method involves aligning the external teeth of the spline shaft at the end of a portion of the working roller with the internal teeth of the spline sleeve 8-1, allowing them to smoothly fit together and complete the docking.

[0139] Another scenario is that the external teeth of the splined shaft at the end of the work roll are misaligned with the internal teeth of the splined sleeve 8-1. As the roll-changing trolley 3-2 moves further, the splined shaft at the end of the work roll will press against the end face of the splined sleeve 8-1 and be pushed along the forward direction of the roll-changing trolley 3-2. Since the locking sleeve 8-3 is fixed to the splined shaft 8-5, and the splined shaft 8-5 is mounted on the upper movable bracket 4-2, and the Y-axis freedom of the upper movable bracket 4-2 is constrained before the roll-changing device is started, such as... Figure 4 As shown, the spline shaft 8-5 is fixed in the Y direction at this time. The movement of the spline sleeve 8-1 will correspondingly compress the spring 8-2. At the same time, since the tension bolt 8-4 is fixed together with the spline sleeve 8-1, the head of the tension bolt 8-4 will also extend outwards to the locking sleeve 8-3 as the spline sleeve 8-1 moves. During this process, since the work roller is always stationary while the spline sleeve 8-1 is always in operation, when the external tooth of the spline shaft at the end of the work roller shaft is in phase with the internal tooth of the spline sleeve 8-1, the spline sleeve 8-1 will be pushed back and fitted into the external tooth of the spline shaft at the end of the work roller shaft under the action of the spring force 8-2, so that all the work rollers are correctly fitted into their respective intermediate couplings 8. When the lower roller box finally stops against the mechanical stop 1-3, the sensing plate 11-6 installed on the roller changing trolley 3-2 just senses the front stop position detection switch 11-1. When the electrical control system receives the position signal, it stops the roller changing reduction motor 3-1, thus successfully completing the pushing operation of the new roller box.

[0140] If either of the two photoelectric switches 9-2 on the photoelectric detection device 9 detects a protruding tension bolt 8-4 before the lower roller box abuts against the mechanical stop 1-3, it will send a signal to the electrical control system, indicating that at least one work roller is not properly engaged with the intermediate coupling 8. The electrical control system will then control the roller changing reduction motor 3-1 to reverse at low speed, and the roller changing trolley 3-2 will pull the lower roller box in the opposite direction. After a certain delay, it will then rotate forward again, pushing the roller changing trolley 3-2 to continue moving into the frame 1 for a second roller changing attempt. The electrical control system is set to attempt three roller changing attempts. If all three attempts fail, the roller changing device will reverse, pulling the upper and lower roller boxes out to the high / low speed switching position detection switch 11-2 and stopping. Then, a second automatic roller changing operation will be performed, or a manual roller changing operation will be performed by manual intervention, until the roller changing operation process is finally completed.

[0141] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A roller straightening machine, comprising a straightening machine frame and two roller boxes arranged vertically within the straightening machine frame, characterized in that: A positioning pin is fixedly provided on one side of the roller box and arranged horizontally along the Y direction. A roller changing bracket is provided on the transmission side of the straightening machine frame. The roller changing bracket includes a seated guide rod, a movable bracket, and a positioning block. The seated guide rod is arranged along the Z direction. The movable bracket is located on the seated guide rod and is slidably connected to the seated guide rod. The positioning block is fixedly located on the movable bracket. The positioning block is provided with a positioning hole for installing the positioning pin. The positioning pin achieves the Z-direction and X-direction positioning of the roller box by cooperating with the positioning hole. The movable bracket is also provided with multiple through holes, each through hole containing an intermediate coupling. One end of the intermediate coupling is detachably connected to the working roller of the roller box via a spline engagement, and the other end is connected to the ball gear coupling at the main power end of the straightener. Wherein, X is the running direction of the steel plate being straightened, Y is the direction of the axis of the working roll of the straightener, and Z is the height direction; The intermediate coupling includes a splined shaft, a splined sleeve, a spring, and a locking sleeve; both ends of the splined shaft are provided with splines, and the splined sleeve is fitted onto one end of the splined shaft. One end of the splined sleeve is connected to the splined shaft via a spline engagement, and the other end is connected to the work roller shaft via a spline; the other end of the splined shaft is connected to the ball gear coupling of the straightener via a spline. The splined shaft is provided with a limiting boss. The locking sleeve and the splined sleeve are respectively located on both sides of the limiting boss. The locking sleeve is fitted onto the splined shaft and abuts against one end of the limiting boss. The spring is located between the limiting boss and the splined sleeve. One end of the spring abuts against the end face of the splined sleeve, and the other end abuts against the end face of the limiting boss. The splined sleeve and the locking sleeve are connected by a tension bolt, and the splined sleeve can slide unidirectionally towards the locking sleeve. The locking sleeve has a through hole, and the tensioning bolt is slidably disposed in the through hole. The head of the tensioning bolt is located on the side of the locking sleeve away from the limiting boss, and the tail of the tensioning bolt is connected to the spline sleeve by a thread. A disc spring is provided between the head of the tensioning bolt and the limiting boss for buffering the movement of the tensioning bolt. A nut is provided at the tail of the tensioning bolt, and the screwing depth of the tensioning bolt is adjusted by the nut, thereby changing the initial compression of the spring. Before changing the roller, a photoelectric detection device is installed on the movable bracket. The device detects whether the head of the tension bolt of the intermediate coupling is blocking the photoelectric detection device to determine whether the intermediate coupling and the roller box are fully assembled and aligned. When the photoelectric detection device detects the head of the tension bolt, at least one intermediate coupling and the working roller of the roller box are not properly assembled.

2. The roller straightening machine according to claim 1, characterized in that: The straightener frame is equipped with an internal track arranged along the Y direction for disassembling and assembling transport roller boxes; guide plates are provided on both sides of the roller box located on the lower side, and side guide plates corresponding to the guide plates are provided on both sides of the straightener frame. The roller box is guided and positioned in the X direction by the cooperation of the guide plates and the side guide plates.

3. The roller straightening machine according to claim 1, characterized in that: The locking sleeve has a split structure, including two semi-circular locking plates, which are connected as one piece by bolts.

4. The roller straightening machine according to claim 1, characterized in that: The splined shaft is provided with a shoulder, and the shoulder is provided with a needle roller bearing and a thrust bearing. The splined shaft is rotatably connected to the movable bracket through the needle roller bearing. The thrust bearing is located between the shoulder and the movable bracket and is used to bear axial force.

5. A method for changing rollers in a roller straightener as described in any one of claims 1 to 4, characterized in that: A roller changing device is installed on one side of the straightening machine frame. The roller changing device includes a geared motor, a roller changing trolley, a traction mechanism, and a roller changing track. The roller changing track is located on one side of the straightening machine frame and is connected to the internal track. The roller changing trolley is slidably mounted on the roller changing track and is connected to the geared motor through the traction mechanism. The roller changing trolley moves along the roller changing track under the drive of the geared motor. The roller changing trolley is connected to the roller box through a pin and transports the roller box in and out of the straightening machine frame. During roll changing, the old roll box is pulled out by the roll changing trolley. After the old roll box is separated from the intermediate coupling, it moves out along the roll changing track. Then, the roll changing trolley moves the new roll box into the straightening machine frame. The roll box is guided and aligned in the X direction by the guide liners on both sides of the roll box contacting the side guide liners in the straightening machine frame. Then, the roll box is positioned in the Z direction by the positioning pins on the roll box and the positioning holes on the positioning blocks, so that the working roll of the roll box is connected to the intermediate coupling through the spline. Before changing the roller, a photoelectric detection device is set on the movable bracket. The device is used to determine whether the intermediate coupling and the roller box are fully assembled and aligned by detecting whether the head of the tension bolt of the intermediate coupling is blocking the photoelectric detection device. When the photoelectric detection device detects the head of the tension bolt, at least one intermediate coupling and the working roller of the roller box are not properly assembled. A position detection device is also installed on the roll changing track to detect the position of the roll changing trolley, thereby enabling segmented control of the trolley's running speed. The segmented speed control method for the roll changing trolley is as follows: The operating range of the roll changing trolley is divided into a high-speed section and a low-speed section. In the high-speed section, the distance between the roll box and the positioning block is ≥100mm, and in the low-speed section, the distance between the roll box and the positioning block is <100mm. The operating speed of the roll changing trolley in the high-speed section is greater than that in the low-speed section. In the low-speed section, the matching relationship between the speed n1 of the reduction motor of the roll changing device and the speed n2 of the main motor of the straightener is matched according to the following formula: in: n1 - Speed ​​of the geared motor of the roller changing device, r / min; i1 - Speed ​​ratio of the reduction motor in the roller changing device; d1 - Pitch circle diameter of the sprocket in the roller changing device, in mm; n2 - Main drive speed of the straightener, r / min; i2 - Overall speed ratio of the main drive unit; The number of teeth on the spline sleeve of the Z-intermediate coupling is the same as the number of teeth on the spline at the end of the work roller shaft. k - the stiffness coefficient of the spring on the intermediate coupling, N / mm; S0 - Initial compression of the spring after the intermediate coupling is assembled, in mm; μ1 - the coefficient of friction between the spline sleeve and the spline shaft; R1 - Spline shaft pitch circle radius, mm; μ2 - coefficient of friction of the working roll bearing; R2 - Equivalent radius of the work roll bearing, mm; G - Weight of the work roll, N; By controlling the matching speed of the reduction motor of the roller changing device and the main motor of the straightener, the spline sleeve of the intermediate coupling can achieve rapid spline alignment with the working roller of the roller box during its rotation.

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