Balancing device and method for high speed cold rolling tube machine crankshaft sector block coaxial bidirectional rotation

Abstract

The present application belongs to the technical field of cold rolling pipe mill, and particularly relates to a balancing device and method for coaxial bidirectional rotation of a crankshaft segment block of a high-speed cold rolling pipe mill. The device is composed of a frame assembly, a driving motor, a shaft coupling, a high-speed shaft, a first gear, a second gear, a connecting rod mechanism, an idler wheel, an idler wheel shaft, a first balancing mechanism, a large gear, a crankshaft, a second balancing mechanism and a base. The first balancing mechanism arranged between the high-speed shaft and the crankshaft integrates the balancing shaft and the segment block in the double-shaft balancing shaft system of the prior art into the crankshaft shaft system. The present application not only inherits the balancing effect of the double-shaft balancing, but also greatly reduces the size and weight of the crankshaft transmission system along the rolling direction, greatly reduces the investment of the equipment, greatly reduces the alternating force and bending moment acting on the crankshaft, prolongs the service life of important components such as the crankshaft and bearings, improves the reliability of the equipment, and reduces the maintenance cost.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of cold rolling pipe mill, and particularly relates to a balancing device and method for coaxial bidirectional rotation of a crankshaft segment block of a high-speed cold rolling pipe mill. BACKGROUND

[0002] A cold rolling pipe mill is a main processing equipment for producing precision seamless pipes, and a classical periodic rolling method is adopted. Therefore, during the rolling process, inertial force and inertial torque are inevitably generated by the moving mass. The inertial force and the inertial torque are related to the moving mass, and the frequency of the reciprocating motion of the moving mass has a greater influence on the inertial force. In order to improve the production speed of the cold rolling pipe mill, the mass of the rack assembly must be optimized, and the mass is minimized under the premise of meeting the strength and rigidity requirements. At the same time, effective inertial force balancing means must be adopted to reduce the force transmitted to the equipment foundation by the crankshaft transmission system during high-speed rolling. The two-roller high-speed cold rolling pipe mill in the prior art usually adopts a double-shaft balancing mode, i.e., a crankshaft shaft system and a balancing shaft system. A plurality of segment balancing blocks are arranged on the crankshaft shaft system and the balancing shaft system. A pair of large gears is engaged between the two shaft systems to ensure that the segment blocks on the two shaft systems rotate in opposite directions. Both domestic high-speed cold rolling pipe mills and KPW series rolling mills of the Westmark MEER Company representing the world's advanced level adopt this inertial force balancing method. In recent years, the MEER Company has adopted the KPWLC+ balancing technology for small and medium-sized rolling mills. The KPWLC+ balancing technology cancels the pair of transmission large gears, and the two driving shafts are directly driven by two high-power torque motors. There is no mechanical connection between the two shaft systems, and the phase control of the segment blocks of the two shafts is completely realized by electrical measures. The main problems of the traditional double-shaft balancing mode are as follows: Since the engagement of the pair of large gears is required, the length of the crankshaft transmission device along the rolling direction is bound to be large, and therefore the weight of the crankshaft transmission device is very large, and the equipment investment is high. Even though the KPWLC+ balancing measure does not require the engagement of the large gears, the rotating radius of the segment blocks on the two shafts is equivalent to that of the large gears, and the outer dimensions of the crankshaft transmission system are not significantly reduced. Another disadvantage of the double-shaft balancing system is that the balancing force acts on the two shafts. Although the residual inertial force of the crankshaft transmission device as a whole is effectively reduced, the stress amplitude on each shaft system cannot be reduced, and therefore the crankshaft shaft system and the connecting pieces are subjected to alternating stress loads, causing the premature failure of important components such as the crankshaft and the bearing. SUMMARY

[0003] The present application provides a balancing device and method for coaxial bidirectional rotation of a crankshaft segment block of a high-speed cold rolling pipe mill. One of the purposes is to provide a balancing device and method for reducing the occupation of the balancing shaft system and reducing the structural weight of the crankshaft transmission device. The second purpose is to provide a balancing device and method capable of reducing the peak value of the force acting on the crankshaft and prolonging the service life of the key components.

[0004] To achieve the above object, the technical scheme adopted by the present application is:

[0005] The balance device for the coaxial bidirectional rotation of the crankshaft sector block of a high-speed cold rolling pipe mill comprises at least a rack assembly, a driving motor, a shaft coupling, a high-speed shaft, a first gear, a second gear, a connecting rod mechanism, an idler, an idler shaft, a first balance mechanism, a large gear, a crankshaft, a second balance mechanism and a base.

[0006] The modulus of the first gear is smaller than that of the second gear.

[0007] The first balance mechanism comprises a first sector block and a balance gear.

[0008] The modulus of the balance gear and the idler is smaller than that of the second gear, and the transmission ratio of the balance gear and the first gear is equal to the transmission ratio of the large gear and the second gear.

[0009] The first sector block is provided with one or two groups.

[0010] The connecting rod mechanism comprises two groups of connecting rods.

[0011] The second balance mechanism comprises four groups of second sector blocks.

[0012] The balance method for the coaxial bidirectional rotation of the crankshaft sector block of a high-speed cold rolling pipe mill adopts the balance device for the coaxial bidirectional rotation of the crankshaft sector block of a high-speed cold rolling pipe mill, and comprises the following steps

[0013] Step 1: the driving motor is started to drive the first gear and the second gear to rotate synchronously with the high-speed shaft.

[0014] Step two: the second gear drives the rotation of the crankshaft through the large gear, while the first gear drives the rotation of the balance gear in the first balance mechanism around the crankshaft axis through the idler, thereby driving the rotation of the first sector block in the first balance mechanism around the crankshaft axis;

[0015] Step three: the rotation of the crankshaft drives the periodic reciprocating linear motion of the rack assembly through the connecting rod, and the horizontal inertia force generated by the periodic reciprocating linear motion of the rack assembly is balanced by the first sector block and the second sector block on the crankshaft, thereby realizing high-speed periodic rolling of the rack assembly.

[0016] Beneficial effects:

[0017] (1) The balance method of the application integrates the balance shaft and the sector block in the double-shaft balance shaft system into the crankshaft system by adding a set of balance wheel systems between the high-speed shaft and the crankshaft. The balance method not only inherits the balance effect of the double-shaft balance, but also greatly reduces the size and weight of the transmission system along the rolling direction of the crankshaft, thereby greatly reducing the investment in equipment.

[0018] (2) The application greatly reduces the alternating force and bending moment acting on the crankshaft, prolongs the service life of important components such as the crankshaft and bearings, improves the reliability of the equipment, and reduces the maintenance cost.

[0019] The above description is only a summary of the technical solutions of the application. In order to more clearly understand the technical means of the application and to implement the content of the description, the following will describe the preferred embodiments of the application in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments. Obviously, the drawings described below only some embodiments of the application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0021] Figure 1 It is a schematic diagram of the transmission of the balancing device in the application.

[0022] Figure 2 It is a side view of the balancing device in the application.

[0023] In the figure: 1, driving motor; 2, shaft coupling; 3, high-speed shaft; 4, first gear; 5, second gear; 6, connecting rod; 7, rack assembly; 8, idler; 9, idler shaft; 10, first sector block; 11, balance gear; 12, large gear; 13, second sector block; 14, crankshaft; 15, base. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0025] Embodiment one:

[0026] According to Figure 1 and Figure 2 The balance device for coaxial bidirectional rotation of the crankshaft segment block of the high-speed cold rolling pipe mill shown in the drawings comprises at least a rack assembly 7; further comprises a driving motor 1, a shaft coupling 2, a high-speed shaft 3, a first gear 4, a second gear 5, a connecting rod mechanism, an idler wheel 8, an idler wheel shaft 9, a first balance mechanism, a large gear 12, a crankshaft 14, a second balance mechanism and a base 15; the base 15 is fixedly connected to one side of the rack assembly 7, and a crankshaft box is fixedly connected to the base 15; the driving motor 1 is connected to the high-speed shaft 3 through the shaft coupling 2, and the high-speed shaft 3 is connected to the crankshaft box through a bearing; the first gear 4 and the second gear 5 are both fixedly connected to the high-speed shaft 3; the crankshaft 14 is connected to the crankshaft box through a bearing, and the crankshaft 14 is arranged in parallel with the high-speed shaft 3; the large gear 12 is fixedly connected to the crankshaft 14 and engages with the second gear 5; the idler wheel 8 is connected to the base 15 through the idler wheel shaft 9, and the idler wheel 8 engages with the first balance mechanism and the first gear 4 respectively; the first balance mechanism is connected to the crankshaft 14 through a bearing; the second balance mechanism is fixedly connected to the crankshaft 14; and the connecting rod mechanism is rotatably connected between the rack assembly 7 and the crankshaft 14.

[0027] In actual use, the driving motor 1 is started to drive the first gear 4 and the second gear 5 to rotate synchronously with the high-speed shaft 3; the second gear 5 drives the crankshaft 14 to rotate through the large gear 12, and the first gear 4 drives the first balance mechanism to rotate around the axis of the crankshaft 14 through the idler wheel 8 but is not synchronous with the rotation of the crankshaft 14; the second balance mechanism rotates synchronously with the crankshaft 14. The rotation of the crankshaft 14 drives the rack assembly 7 to make a periodic reciprocating linear motion through the connecting rod mechanism, and the horizontal inertial force generated in the periodic reciprocating linear motion of the rack assembly 7 is balanced by the first balance mechanism and the second balance mechanism on the crankshaft 14, so that the high-speed, periodic and stable rolling of the rack assembly 7 is realized.

[0028] Compared with the conventional technical solution, the technical solution of the present application greatly reduces the force and stress amplitude on the crankshaft, the crankshaft bearing and the bearing seat, prolongs the service life of the crankshaft, reduces the vibration of the crankshaft during high-speed rolling, and greatly shortens the length of the high-speed cold rolling pipe mill crankshaft transmission system along the rolling direction by the design of the single crankshaft, effectively reducing the weight and investment of the equipment.

[0029] Embodiment two:

[0030] According to Figure 1 The balance device of the crankshaft sector block coaxial bidirectional rotation of the high-speed cold rolling pipe machine shown in the figure is different from embodiment one in that the modulus of the first gear 4 is smaller than the modulus of the second gear 5.

[0031] In actual use, the design that the modulus of the first gear 4 is smaller than the modulus of the second gear 5 can first ensure the successful implementation of the mechanism, and secondly, since the first gear 4 is only used to transmit the movement of the first balance mechanism, it does not participate in work for metal deformation in the rolling process, so the design is more reasonable.

[0032] Embodiment three:

[0033] According to Figure 1 and Figure 2 The balance device of the crankshaft sector block coaxial bidirectional rotation of the high-speed cold rolling pipe machine shown in the figure is different from embodiment one in that the first balance mechanism includes a first sector block 10 and a balance gear 11; the balance gear 11 is connected with the crankshaft 14 through a bearing, is engaged with the idler gear 8, and is placed on the same side of the crankshaft 14 as the large gear 12; the first sector block 10 is fixedly connected on the balance gear 11; the rotation direction of the balance gear 11 is opposite to the rotation direction of the crankshaft 14, but the angular velocity of rotation is the same.

[0034] Further, the modulus of the balance gear 11 and the idler gear 8 is smaller than the modulus of the second gear 5, and the transmission ratio of the balance gear 11 and the first gear 4 is equal to the transmission ratio of the large gear 12 and the second gear 5.

[0035] In actual use, the first balance mechanism adopts the above technical scheme, which ensures that the rotation direction of the balance gear 11 is opposite to the rotation direction of the crankshaft 14, but the angular velocity of rotation is the same, thereby cooperating with the second balance mechanism to realize the balance of the horizontal inertial force generated in the periodic reciprocating linear motion of the rack assembly 7, and realize the high-speed, periodic and stable rolling of the rack assembly 7.

[0036] Embodiment four:

[0037] According to Figure 1 and Figure 2 The balance device of the crankshaft sector block coaxial bidirectional rotation of the high-speed cold rolling pipe machine shown in the figure is different from embodiment three in that the first sector block 10 is provided with one or two groups.

[0038] In actual use, the number of the first sector blocks 10 can be determined according to actual conditions, and the first sector blocks 10 are matched with the second balancing mechanism to balance the horizontal inertial force generated by the rack assembly 7 in the periodic reciprocating linear motion, so that the rack assembly 7 can perform rolling production at high speed, periodically and stably.

[0039] Example five:

[0040] According to the high-speed cold rolling pipe machine crankshaft sector block coaxial two-way rotation balancing device shown in Figure 1 and Figure 2 The difference between the embodiment one and the embodiment two is that the connecting rod mechanism includes two groups of connecting rods 6; the two groups of connecting rods 6 are arranged in parallel; one end of each group of connecting rods 6 is connected with the rack assembly 7 through a bearing, and the other end is connected at the crank of the crankshaft 14 through a bearing.

[0041] In actual use, the connecting rod mechanism is arranged to transmit the rotation of the crankshaft 14 to the rack assembly 7 through the connecting rod mechanism to realize the periodic reciprocating linear motion of the rack assembly 7.

[0042] The two groups of connecting rods 6 arranged in the connecting rod mechanism ensure that the rotation force of the crankshaft 14 can be stably and balanced transmitted to the rack assembly 7.

[0043] Example six:

[0044] According to the high-speed cold rolling pipe machine crankshaft sector block coaxial two-way rotation balancing device shown in Figure 1 and Figure 2 The difference between the embodiment one and the embodiment two is that the connecting rod mechanism includes two groups of connecting rods 6; the two groups of connecting rods 6 are arranged in parallel; one end of each group of connecting rods 6 is connected with the rack assembly 7 through a bearing, and the other end is connected at the crank of the crankshaft 14 through a bearing.

[0045] In actual use, the second balancing mechanism adopts the above technical solution, which can fully utilize the rotation radius of the large gear 12, balance the stress state of the crankshaft 14, and optimize the distribution of the force of the crankshaft 14 acting on the crankshaft box.

[0046] Example seven:

[0047] According to the high-speed cold rolling pipe machine crankshaft sector block coaxial two-way rotation balancing device shown in Figure 1 and Figure 2The balance device of the coaxial bidirectional rotation of the shown high-speed cold rolling pipe machine crankshaft segment block is different from the embodiment one in that: the first balance mechanism comprises a first segment block 10 and a balance gear 11; the balance gear 11 is connected with the crankshaft 14 through a bearing and is engaged with the idler gear 8, and is placed on the same side of the large gear 12 of the crankshaft 14; the first segment block 10 is fixedly connected on the balance gear 11; the rotation direction of the balance gear 11 is opposite to the rotation direction of the crankshaft 14, but the angular velocity of the rotation is the same; the module of the balance gear 11 and the idler gear 8 is smaller than the module of the second gear 5, and the gear ratio of the balance gear 11 and the first gear 4 is equal to the gear ratio of the large gear 12 and the second gear 5; the module of the first gear 4 is smaller than the module of the second gear 5; the first segment block 10 is provided with one or two groups; the connecting rod mechanism comprises two groups of connecting rods 6; the two groups of connecting rods 6 are arranged in parallel; one end of each group of connecting rods 6 is connected with the rack assembly 7 through a bearing, and the other end is connected with the crankpin of the crankshaft 14 through a bearing; the second balance mechanism comprises four groups of second segment blocks 13; the four groups of second segment blocks 13 are fixedly connected on one side of the crankshaft 14.

[0048] In actual use, the first gear 4 and the second gear 5 are fixedly installed on the high-speed shaft 3 and rotate synchronously with the high-speed shaft 3; the large gear 12 is fixedly connected with the crankshaft 14 and engaged with the second gear 5, so as to transmit the power input by the driving motor 1 to the crankshaft 14; the second segment block 13 has four groups, which are fixedly installed on the crankshaft 14 and rotate synchronously with the crankshaft 14; the balance gear 11 is installed on the crankshaft on the same side of the large gear 12, and is connected with the crankshaft 14 through a bearing, so that the balance gear 11 does not rotate with the crankshaft 14; the first segment block 10 is fixedly connected with the balance gear 11 and rotates around the crankshaft axis with the balance gear 11.

[0049] The driving motor 1 is started to drive the first gear 4 and the second gear 5 to rotate synchronously with the high-speed shaft 3, the power input by the driving motor 1 is transmitted to the crankshaft 14 through the second gear 5 and the large gear 12, the crankshaft 14 rotates to drive the rack assembly 7 to make periodic reciprocating linear motion through the connecting rod 6; the first gear 4 drives the balance gear 11 to rotate around the crankshaft 14 through the idler gear 8, so as to drive the first segment block 10 to rotate around the crankshaft 14. The horizontal inertial force generated in the periodic reciprocating linear motion of the rack assembly 7 under the driving of the driving motor 1 is balanced by the first segment block 10 and the second segment block 13 on the crankshaft 14, so that the high-speed and stable periodic rolling of the rack assembly is realized.

[0050] The present application integrates the balance shaft and the sector block in the double-shaft balance shaft system in the prior art to the crankshaft by setting the first balance mechanism between the high-speed shaft 3 and the crankshaft 14.

[0051] Embodiment eight:

[0052] With reference to Figure 1 and Figure 2 , the high-speed cold-rolled pipe machine crankshaft sector block coaxial two-way rotation balance method adopts a high-speed cold-rolled pipe machine crankshaft sector block coaxial two-way rotation balance device, and comprises the following steps

[0053] Step one: the driving motor 1 is started to drive the first gear 4 and the second gear 5 to rotate synchronously with the high-speed shaft 3;

[0054] Step two: the second gear 5 drives the crankshaft 14 to rotate through the large gear 12, and the first gear 4 drives the balance gear 11 in the first balance mechanism to rotate around the axis of the crankshaft 14 through the idler gear 8, so as to drive the first sector block 10 in the first balance mechanism to rotate around the axis of the crankshaft 14;

[0055] Step three: the rotation of the crankshaft 14 drives the rack assembly 7 to make a periodic reciprocating linear motion through the connecting rod 6, and the horizontal inertial force generated by the periodic reciprocating linear motion of the rack assembly 7 is balanced by the first sector block 10 and the second sector block 13 on the crankshaft 14, so that the high-speed periodic rolling of the rack assembly 7 is realized.

[0056] The present application has good balance effect, greatly reduces the size and weight of the crankshaft transmission system along the rolling direction, can greatly reduce the investment of the equipment, at the same time, greatly reduces the alternating force and bending moment acting on the crankshaft 14, prolongs the service life of the important components such as the crankshaft 14 and the bearing, improves the reliability of the equipment, and reduces the maintenance cost.

[0057] In the case of no conflict, the skilled in the art can combine the related technical features in the above examples according to the actual situation to achieve the corresponding technical effect, and the specific combinations are not described one by one here.

[0058] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative positional relationship, motion condition, etc. between the components in a certain posture (as shown in the drawings), and if the certain posture changes, the directional indications also change accordingly.

[0059] In addition, the terms "first", "second", and the like, as used in the description, are used for distinguishing like from like and do not imply or connote any meaning or importance other than the point of distinction. Thus, a "first" feature discussed above could be termed a "second" feature without departing from the teachings of the present application.

[0060] The above description is merely that of preferred embodiments of the application, and is not intended to limit the application to the specific exemplifications. The application is limited only by the language of the claims. Any modifications, equivalent substitutions, and improvements made to the above-described embodiments are intended to be included in the scope of the application.

Claims

1. A balancing device for coaxial bidirectional rotation of crankshaft sector blocks in a high-speed cold rolling mill, comprising at least a frame assembly (7); characterized in that: It also includes a drive motor (1), a coupling (2), a high-speed shaft (3), a first gear (4), a second gear (5), a connecting rod mechanism, an idler wheel (8), an idler wheel shaft (9), a first balancing mechanism, a large gear (12), a crankshaft (14), a second balancing mechanism, and a base (15); the base (15) is fixedly connected to one side of the frame assembly (7), and a crankshaft housing is fixedly connected to the base (15); the drive motor (1) is connected to the high-speed shaft (3) through the coupling (2), and the high-speed shaft (3) is connected to the crankshaft housing through bearings; the first gear (4) and the second gear (5) are both fixedly connected to the high-speed shaft (7). The crankshaft (14) is connected to the crankcase via bearings and is parallel to the high-speed shaft (3); the large gear (12) is fixedly connected to the crankshaft (14) and meshes with the second gear (5); the idler wheel (8) is connected to the base (15) via the idler wheel shaft (9) and meshes with the first balancing mechanism and the first gear (4) respectively; the first balancing mechanism is connected to the crankshaft (14) via bearings; the second balancing mechanism is fixedly connected to the crankshaft (14); the connecting rod mechanism is rotatably connected between the frame assembly (7) and the crankshaft (14); The first balancing mechanism includes a first sector block (10) and a balancing gear (11); the balancing gear (11) is connected to the crankshaft (14) via a bearing and meshes with an idler gear (8); the rotation direction of the balancing gear (11) is opposite to the rotation direction of the crankshaft (14), but the rotational angular velocity is the same; the balancing gear (11) does not rotate with the crankshaft (14); the first sector block (10) is fixedly connected to the balancing gear (11) and rotates with the balancing gear (11) around the crankshaft axis; The transmission ratio between the balance gear (11) and the first gear (4) is equal to the transmission ratio between the large gear (12) and the second gear (5); The module of the first gear (4) is smaller than the module of the second gear (5); The balance gear (11) and the large gear (12) are located on the same side of the crankshaft (14); The modules of the balance gear (11) and idler gear (8) are both smaller than the module of the second gear (5).

2. The balancing device for coaxial bidirectional rotation of the crankshaft sector block in a high-speed cold rolling mill as described in claim 1, characterized in that: The first sector block (10) is set in one or two groups.

3. The balancing device for coaxial bidirectional rotation of the crankshaft sector block in a high-speed cold rolling mill as described in claim 1, characterized in that: The linkage mechanism includes two sets of linkages (6); the two sets of linkages (6) are arranged in parallel; one end of each linkage (6) is connected to the frame assembly (7) through a bearing, and the other end is connected to the crankshaft (14) crankshaft (14) through a bearing.

4. The balancing device for coaxial bidirectional rotation of the crankshaft sector block in a high-speed cold rolling mill as described in claim 1, characterized in that: The second balancing mechanism includes four sets of second sector blocks (13); the four sets of second sector blocks (13) are evenly fixedly connected to one side of the crankshaft (14).

5. A balancing method for the coaxial bidirectional rotation of the crankshaft sector blocks in a high-speed cold rolling mill, characterized by: The balancing device for coaxial bidirectional rotation of the crankshaft sector blocks of a high-speed cold rolling mill as described in any one of claims 1-4 includes the following steps: Step 1: The drive motor (1) starts, driving the first gear (4) and the second gear (5) to rotate synchronously with the high-speed shaft (3); Step 2: The second gear (5) drives the crankshaft (14) to rotate through the large gear (12), while the first gear (4) drives the balance gear (11) in the first balancing mechanism to rotate around the crankshaft (14) axis through the idler wheel (8), thereby driving the first sector block (10) in the first balancing mechanism to also rotate around the crankshaft (14) axis. Step 3: The rotation of the crankshaft (14) drives the frame assembly (7) to make periodic reciprocating linear motion via the connecting rod (6). The horizontal inertial force generated by the frame assembly (7) in the periodic reciprocating linear motion is balanced by the first sector block (10) and the second sector block (13) on the crankshaft (14), respectively, to realize the high-speed periodic rolling of the frame assembly (7).

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