A multi-speed ratio asynchronous rolling mill

Abstract

The present invention belongs to the technical field of small and medium-sized rolling equipment, and specifically relates to an asynchronous rolling mill with multiple speed ratios, comprising a reduction motor, a gear base and a two-roll rolling mill, wherein the gear base comprises a housing, and two groups of shifting mechanisms are installed on the housing, wherein the first group of shifting mechanisms is used to realize the shifting between a first blind shaft double gear and a second blind shaft double gear, and the second group of shifting mechanisms is used to realize the shifting between a third blind shaft double gear and a fourth blind shaft double gear, and the shifting mechanism is slidably connected with a spring ball locking device, thereby solving the problem that the speed of the motor changes when the load changes and the entire asynchronous rolling process cannot be completed under a constant speed ratio, and the present invention can realize multi-speed adjustment of the speed ratio and can adjust the speed ratio according to needs.

Description

Technical Field

[0001] The invention belongs to the technical field of small and medium-sized rolling equipment, and in particular relates to an asynchronous rolling mill with multiple speed ratios. Background Art

[0002] The asynchronous rolling mill adopts asynchronous rolling, which reduces the rolling force by making the surface linear speeds of the upper and lower working rolls different. At present, in the process of rolling composite plates, asynchronous rolling can improve the warping degree of composite plates by "rubbing and rolling". Therefore, the accuracy of the speed ratio of the upper and lower rollers in the asynchronous rolling process directly determines the accuracy and shape of the product.

[0003] At present, small and medium-sized asynchronous rolling mills with a roll diameter of 150 mm usually do not use a gear base to achieve asynchronous rolling. Instead, two three-phase motors are directly connected to two rolls through a coupling. The speed of the two three-phase motors is controlled by the operating console controller to achieve the target speed ratio. The problems are as follows:

[0004] 1. According to the mechanical characteristic curve of the motor, when the load changes, the speed will also change. When the rolling mill is working, there is a problem of inconsistent friction between the upper and lower rollers and the upper and lower surfaces of the plate, which leads to a difference in the load of the upper and lower rollers, thus changing the speed and making it impossible to complete the entire asynchronous rolling process at a constant speed ratio.

[0005] 2. Small and medium-sized asynchronous rolling mills connect the reduction motor to the upper and lower rollers of the rolling mill through a cross-axis universal coupling. Due to the radial size deviation between the output end of the reduction motor and the input end of the rolling mill, the angle between the coupling axis and the horizontal line is greater than 15°, which will cause speed shock during the rolling process and affect the rolling stability. Summary of the invention

[0006] Aiming at the problem that a constant speed ratio cannot be maintained in the above-mentioned small and medium-sized asynchronous rolling mills with a roll diameter of 150 mm, the present invention designs an asynchronous rolling mill with multiple speed ratios.

[0007] To achieve the above object, the present invention adopts the following technical solutions:

[0008] An asynchronous rolling mill with multiple gear ratios, comprising a reduction motor, a gear base and a two-roll rolling mill, wherein the gear base comprises a housing, a transmission mechanism and a shifting mechanism are arranged in the housing, the transmission mechanism comprises a through shaft and a blind shaft, the through shaft and the blind shaft are both rotatably mounted on the housing, the input end of the through shaft is connected to the output shaft of the reduction motor through a flange coupling, the output ends of the through shaft and the blind shaft are respectively connected to two rollers of the two-roll rolling mill through a cross-axis universal coupling, and a first through shaft gear, a second through shaft gear, ... The blind shaft is provided with a first blind shaft double gear, a first gear hub, a second blind shaft double gear, a third blind shaft double gear, a second gear hub and a fourth blind shaft double gear in sequence, the first gear hub and the second gear hub are connected to the blind shaft by a key connection, the first blind shaft double gear, the second blind shaft double gear, the third blind shaft double gear and the fourth blind shaft double gear are rotatably connected to the blind shaft by a bearing, and the first through-shaft gear, the second through-shaft gear, the third through-shaft gear and the fourth through-shaft ... The gears are respectively meshed and connected with the main gears on the first blind-shaft double gear, the second blind-shaft double gear, the third blind-shaft double gear and the fourth blind-shaft double gear. Two sets of shifting mechanisms are also installed on the box body. The first set of shifting mechanisms is used to achieve the shifting between the first blind-shaft double gear and the second blind-shaft double gear, and the second set of shifting mechanisms is used to achieve the shifting between the third blind-shaft double gear and the fourth blind-shaft double gear. The shifting mechanism includes a flange fixed to the upper surface of the box body, and a shifting rod is rotatably connected inside the flange. The shifting rod The upper end is connected with a shift ball handle through a flange plate, and the lower end of the shift rod is installed with a shift gear through a flange plate, and the shift gear is meshingly connected with a shift rack, and shift support rods are fixedly connected to both ends of the shift rack, and a shift fork is fixedly installed on one of the shift support rods, and a coupling sleeve is rotatably clamped on the shift fork, and the coupling sleeve is meshingly connected to the corresponding first gear hub or the second gear hub, and the shift support rod is slidably connected to a spring ball locking device, and the spring ball locking device is installed on the side wall of the box body.

[0009] Furthermore, the box body includes an upper box body, a middle box body and a lower box body, and positioning pins are provided between the upper box body and the middle box body and between the middle box body and the lower box body. The upper box body and the middle box body, and the middle box body and the lower box body are fixed by bolts.

[0010] Furthermore, an observation window is provided on the middle box body to facilitate observation of the working condition of the coupling sleeve.

[0011] Furthermore, the blind shaft is arranged at the connection between the upper box body and the middle box body, and the central axis of the blind shaft is on the same horizontal plane as the connection line between the upper box body and the middle box body; the through shaft is arranged at the connection between the middle box body and the lower box body, and the central axis of the through shaft is on the same horizontal plane as the connection line between the middle box body and the lower box body.

[0012] Furthermore, two assembly rings are symmetrically arranged on the upper surface of the upper box body.

[0013] Furthermore, a filter is provided on the upper surface of the upper box body.

[0014] Furthermore, the spring ball locking device includes a mounting seat fixedly connected to the side wall of the box body, a slideway is opened in the mounting seat, the shift support rod is slidably set in the slideway, a top-closed sleeve is fixedly connected to the upper surface of the mounting seat, a spring is arranged in the sleeve, a steel ball is installed at the lower end of the spring, and three grooves corresponding to the steel balls are opened on the shift support rod.

[0015] Furthermore, the angle between the axis of the cross-axis universal coupling and the horizontal line is 0°~5°.

[0016] Furthermore, the shift support rod is threadedly connected to the shift rack, and the shift support rod is a non-cylindrical structure.

[0017] Furthermore, the transmission ratio of the gear base i It is 0.8~1.25.

[0018] Compared with the prior art, the present invention has the following advantages:

[0019] The present invention adopts a gear base to replace the method of controlling the speed ratio of the asynchronous rolling mill by controlling the speed of two three-phase motors. The gear base can achieve accurate and stable transmission ratio through mechanical gear matching, which solves the problem that the speed of the motor changes when the load changes and the entire asynchronous rolling process cannot be completed under a constant speed ratio. At the same time, the present application can realize multi-speed adjustment of the speed ratio and can adjust the speed ratio as needed.

[0020] In the present invention, the angle between the coupling axis and the horizontal line is 0°~5°; compared with the cross-axis universal coupling directly connecting the motor and the roller before the improvement, the angle between the coupling axis and the horizontal line is greater than 15°. After the improvement, the roller will not produce large speed fluctuations, making the rolling process more stable.

[0021] The present invention provides a spring ball locking device, which is arranged at the end of the shift support rod. The end of the shift support rod is provided with corresponding grooves for different gears. Automatic locking after the gear is changed is achieved through the cooperation between the groove and the spring ball locking device. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the present invention;

[0023] Figure 2 It is a schematic structural diagram of the gear base of the present invention;

[0024] Figure 3 It is a schematic diagram of the cross-sectional structure of the present invention;

[0025] Figure 4 It is a schematic diagram of the side section structure of the gear base of the present invention;

[0026] Figure 5 It is a schematic diagram of the installation of the through shaft of the present invention;

[0027] Figure 6 It is a schematic diagram of the installation of the blind shaft of the present invention;

[0028] Figure 7 It is a structural schematic diagram of the shift mechanism of the present invention;

[0029] Figure 8 A partial cross-sectional view of the shift mechanism of the present invention;

[0030] Fig. 9 A cross-sectional view of the gear base of the present invention when in neutral gear;

[0031] Fig.10 It is a cross-sectional view of the gear base of the present invention when the gear is engaged;

[0032] Fig.11 For the present invention Figure 3 A partial enlarged view of the middle circle A;

[0033] Fig.12 It is a schematic diagram of the installation of the shift rack and the shift support rod of the present invention;

[0034] In the figure, reduction motor 1, flange coupling 2, gear base 3, cross shaft universal coupling 4, two-roll mill 5, through shaft 301, first through shaft gear 302, second through shaft gear 303, third through shaft gear 304, fourth through shaft gear 305, blind shaft 306, first blind shaft double gear 307, first gear hub 308, second blind shaft double gear 309, third blind shaft double gear 310, second gear hub 311, fourth blind shaft double gear 312, flange 313, Shift lever 314, shift ball handle 315, shift gear 316, shift rack 317, shift support rod 318, shift fork 319, coupling sleeve 320, spring ball locking device 321, box body 322, mounting seat 3211, slideway 3212, sleeve 3213, spring 3214, steel ball 3215, groove 3216, upper box body 3221, middle box body 3222, lower box body 3223, observation window 3224, lifting ring 3225, filter 3226. DETAILED DESCRIPTION

[0035] In order to further illustrate the technical solution of the present invention, the present invention is further described below with reference to the accompanying drawings. Example 1

[0036] like Figures 1 to 12 As shown, an asynchronous rolling mill with multiple gear ratios includes a reduction motor 1, a gear base 3 and a two-roll rolling mill 5. The gear base 3 includes a box 322, and a transmission mechanism and a shifting mechanism are arranged in the box 322. Figure 3As shown, the transmission mechanism includes a through shaft 301 and a blind shaft 306, and the through shaft 301 and the blind shaft 306 are both rotatably mounted on the box body 322. The input end of the through shaft 301 is connected to the output shaft of the reduction motor 1 through the flange coupling 2, and the output ends of the through shaft 301 and the blind shaft 306 are respectively connected to the two rollers of the two-roller mill 5 through the cross shaft universal coupling 4. The angle between the axis of the cross shaft universal coupling 4 and the horizontal line is 0.14°. The first through shaft gear 302, the second through shaft gear 303, the third through shaft gear 304 and the fourth through shaft gear 305 are keyed in sequence on the through shaft 301, and the first blind shaft gear 306 is provided in sequence on the blind shaft 306. The double gear 307, the first gear hub 308, the second blind shaft double gear 309, the third blind shaft double gear 310, the second gear hub 311 and the fourth blind shaft double gear 312, the first gear hub 308 and the second gear hub 311 are connected to the blind shaft 306 by a key connection, the first blind shaft double gear 307, the second blind shaft double gear 309, the third blind shaft double gear 310 and the fourth blind shaft double gear 312 are rotatably connected to the blind shaft 306 by a bearing, and the first through-shaft gear 302, the second through-shaft gear 303, the third through-shaft gear 304 and the fourth through-shaft gear 305 are respectively connected to the first blind shaft double gear 307, the second blind shaft double gear 309, the third blind shaft double gear 310 and the fourth blind shaft double gear 312. The main gears on the double-linked gear 309, the third blind-shaft double-linked gear 310 and the fourth blind-shaft double-linked gear 312 are meshed and connected. Two sets of shifting mechanisms are also installed on the box body. The first set of shifting mechanisms is used to achieve the shifting between the first blind-shaft double-linked gear 307 and the second blind-shaft double-linked gear 309, and the second set of shifting mechanisms is used to achieve the shifting between the third blind-shaft double-linked gear 310 and the fourth blind-shaft double-linked gear 312. The shifting mechanism includes a flange 313 fixed to the upper surface of the box body, and a shifting rod 314 is rotatably connected inside the flange 313. The upper end of the shifting rod 314 passes through the flange 313 and is connected to a shifting ball handle 315. The lower end of the shifting rod 314 A shift gear 316 is installed at the end through the flange 313, and the shift gear 316 is meshed with a shift rack 317. Shift support rods 318 are threadedly connected to both ends of the shift rack 317. A shift fork 319 is fixedly installed on one of the shift support rods 318, and a coupling sleeve 320 is rotatably clamped on the shift fork 319. The coupling sleeve 320 is meshed with the corresponding first gear hub 308 or the second gear hub 311. The shift support rod 318 is slidably connected to a spring ball locking device 321, and the spring ball locking device 321 is installed on the side wall of the box body 322. The transmission ratio i of the gear base is 0.8~1.25.

[0037] The box body 322 includes an upper box body 3221, a middle box body 3222 and a lower box body 3223. Positioning pins are arranged between the upper box body 3221 and the middle box body 3222 and between the middle box body 3222 and the lower box body 3223. The upper box body 3221 and the middle box body 3222 and the middle box body 3222 and the lower box body 3223 are fixed by bolts. An observation window 3224 is provided on the middle box body 3222 to facilitate observation of the working condition of the coupling sleeve 320. The blind shaft 306 is arranged on the upper box body 322 1 is at the connection between the upper box body 3221 and the middle box body 3222, the central axis of the blind shaft 306 and the connection line between the upper box body 3221 and the middle box body 3222 are on the same horizontal plane, the through shaft 301 is arranged at the connection between the middle box body 3222 and the lower box body 3223, the central axis of the through shaft 301 and the connection line between the middle box body 3222 and the lower box body 3223 are on the same horizontal plane, two assembly rings 3225 are symmetrically arranged on the upper surface of the upper box body 3221, and a filter 3226 is arranged on the upper surface of the upper box body 3221.

[0038] The spring ball locking device 321 includes a mounting seat 3211 fixedly connected to the side wall of the box body 322, a slideway 3212 is provided in the mounting seat 3211, the shift support rod 318 is slidably set in the slideway 3212, a top-closed sleeve 3213 is fixedly connected to the upper surface of the mounting seat 3211, a spring 3214 is provided in the sleeve 3213, a steel ball 3215 is installed at the lower end of the spring 3214, and three grooves 3216 corresponding to the steel ball 3215 are provided on the shift support rod 318.

[0039] Under different gear positions of the gear base 3, the position of the coupling sleeve 320 of the gear base 3 and the self-locking position of the steel ball 3215 and the groove 3216 of the shift support rod 318 have the following conditions:

[0040] When in neutral, the coupling sleeve 320 is only meshed with the first gear hub 308 and the second gear hub 311, and the blind shaft 306 does not transmit power. In the first gear, the first gear hub 308 is connected to the first blind shaft double gear 307 through the corresponding coupling sleeve 320, and the power is transmitted to the blind shaft 306. In the second gear, the first gear hub 308 is connected to the second blind shaft double gear 309 through the corresponding coupling sleeve 320, and the power is transmitted to the blind shaft 306. In the third gear, the second gear hub 311 is connected to the third blind shaft double gear 310 through the corresponding coupling sleeve 320, and the power is transmitted to the blind shaft 306. In the fourth gear, the second gear hub 311 is connected to the fourth blind shaft double gear 312 through the corresponding coupling sleeve 320, and the power is transmitted to the blind shaft 306.

[0041] In this embodiment, the center distance between the through shaft 301 and the blind shaft 306 is 252 mm, and the multiple speed ratios that can be achieved are:i =1.25, i =1.1, i =1, i =0.8. Under the premise of meeting the center distance and the minimum number of teeth of the transmission gear without root cutting, according to The calculation results are:

[0042] The transmission ratio between the main gear on the first blind shaft double gear 307 and the first through shaft gear 302 , take the gear module as 8.

[0043] The transmission ratio between the main gear on the second blind shaft double gear 309 and the second through shaft gear 303 , take the gear module as 8.

[0044] The transmission ratio between the main gear on the third blind shaft double gear 310 and the third through shaft gear 304 , take the gear module as 7.

[0045] The transmission ratio between the main gear on the fourth blind shaft double gear 312 and the fourth through shaft gear 305 , take the gear module as 8. i Indicates the transmission ratio, Z 1 Indicates the number of teeth on the driving gear, Z 2 Indicates the number of teeth on the driven gear.

[0046] The center distance between two meshing gears , through calculation and verification, it is found that the center distance of each pair of gears is 252mm.

[0047] In addition, the number of teeth and the module of the first gear hub 308 are the same as the number of teeth and the module of the sub-gear on the first blind shaft double gear 307 and the second blind shaft double gear 309, and the number of teeth and the module of the second gear hub 311 are the same as the number of teeth and the module of the sub-gear on the third blind shaft double gear 310 and the fourth blind shaft double gear 312. Specifically, under the premise of satisfying the tooth surface contact strength and the tooth surface bending strength, the number of teeth of the sub-gear on the first gear hub 308 and the first blind shaft double gear 307 and the second blind shaft double gear 309 is 35 and the module is 8, and the number of teeth of the inner ring gear of the coupling sleeve 320 corresponding to the first gear hub 308 is 35 and the module is 8. The number of teeth of the sub-gear on the second gear hub 311 and the third blind shaft double gear 310 and the fourth blind shaft double gear 312 is 40 and the module is 7, and the number of teeth of the inner ring gear of the coupling sleeve 320 corresponding to the second gear hub 311 is 40 and the module is 7.

[0048] The gear base 3 is connected to the two-roll mill 5 by a cross-axis universal coupling 4. If the angle between the axis of the cross-axis universal coupling 4 and the horizontal plane is greater than 15°, it will cause speed fluctuations, thereby affecting the rolling effect. In this embodiment, the center distance between the through shaft 301 and the blind shaft 306 is 252mm, and the center distance between the upper and lower rollers of the two-roll mill 5 connected to it by the cross-axis universal coupling 4 is 250mm, and the length of the cross-axis universal coupling 4 is 400mm. Calculate the horizontal height difference of the cross-axis universal coupling 4 , through geometric relations we can get , and finally the inclination angle of the cross-axis universal coupling 4 is obtained , which is smaller than the maximum boundary condition that produces velocity fluctuations. Example 2

[0049] In this embodiment, the angle between the axis of the cross-axis universal coupling 4 and the horizontal line is 0°. Example 3

[0050] In this embodiment, the angle between the axis of the cross-axis universal coupling 4 and the horizontal line is 5°.

[0051] The above shows and describes the main features and advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes that fall within the meaning and scope of the equivalent elements of the claims are included in the present invention.

[0052] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An asynchronous rolling mill with multiple speed ratios, characterized in that: The invention comprises a reduction motor (1), a gear base (3) and a two-roll rolling mill (5), wherein the gear base (3) comprises a housing (322), wherein a transmission mechanism and a shifting mechanism are arranged in the housing (322), wherein the transmission mechanism comprises a through shaft (301) and a blind shaft (306), wherein the through shaft (301) and the blind shaft (306) are both rotatably mounted on the housing (322), wherein the input end of the through shaft (301) is connected to the output shaft of the reduction motor (1) via a flange coupling (2), wherein the output ends of the through shaft (301) and the blind shaft (306) are respectively connected to two rollers of the two-roll rolling mill (5) via a cross-axis universal coupling (4), and wherein a first through shaft gear (302), a second through shaft gear (306) are sequentially keyed to the through shaft (301). (303), a third through-shaft gear (304) and a fourth through-shaft gear (305); a first blind shaft double gear (307), a first gear hub (308), a second blind shaft double gear (309), a third blind shaft double gear (310), a second gear hub (311) and a fourth blind shaft double gear (312) are sequentially arranged on the blind shaft (306); the first gear hub (308) and the second gear hub (311) are both connected to the blind shaft (306) by a key connection; the first blind shaft double gear (307), the second blind shaft double gear (309), the third blind shaft double gear (310) and the fourth blind shaft double gear (312) are all rotatably connected to the blind shaft (306) by a bearing; and the first through-shaft gear The first gear (302), the second through-shaft gear (303), the third through-shaft gear (304) and the fourth through-shaft gear (305) are respectively meshed with the main gears on the first blind-shaft double gear (307), the second blind-shaft double gear (309), the third blind-shaft double gear (310) and the fourth blind-shaft double gear (312). Two groups of shifting mechanisms are also installed on the housing. The first group of shifting mechanisms is used to achieve shifting between the first blind-shaft double gear (307) and the second blind-shaft double gear (309). The second group of shifting mechanisms is used to achieve shifting between the third blind-shaft double gear (310) and the fourth blind-shaft double gear (312). The shifting mechanisms include a flange (313) fixed on the upper surface of the housing. 13) is internally rotatably connected with a shift rod (314), the upper end of the shift rod (314) passes through a flange (313) and is connected with a shift ball handle (315), the lower end of the shift rod (314) passes through the flange (313) and is installed with a shift gear (316), the shift gear (316) is meshingly connected with a shift rack (317), both ends of the shift rack (317) are fixedly connected with a shift support rod (318), a shift fork (319) is fixedly installed on one of the shift support rods (318), a coupling sleeve (320) is rotatably clamped on the shift fork (319), and the coupling sleeve (320) is meshingly connected with the corresponding first gear hub (308) or the second gear hub (311),The shift support rod (318) is slidably connected to the spring ball locking device (321), and the spring ball locking device (321) is installed on the side wall of the box (322). The spring ball locking device (321) includes a mounting seat (3211) fixedly connected to the side wall of the box (322), a slideway (3212) is provided in the mounting seat (3211), and the shift support rod (318) is slidably arranged in the slideway (3212). A sleeve (3213) with a closed top is fixedly connected to the upper surface of the mounting seat (3211), a spring (3214) is provided in the sleeve (3213), a steel ball (3215) is installed at the lower end of the spring (3214), and three grooves (3216) corresponding to the steel balls (3215) are provided on the shift support rod (318).

2. The asynchronous rolling mill with multiple speed ratios according to claim 1, characterized in that: The box body (322) includes an upper box body (3221), a middle box body (3222) and a lower box body (3223), and positioning pins are provided between the upper box body (3221) and the middle box body (3222) and between the middle box body (3222) and the lower box body (3223), and the upper box body (3221) and the middle box body (3222) and the middle box body (3222) and the lower box body (3223) are fixed by bolts.

3. The asynchronous rolling mill with multiple speed ratios according to claim 2, characterized in that: An observation window (3224) is provided on the middle box body (3222) to facilitate observation of the working condition of the coupling sleeve (320).

4. The asynchronous rolling mill with multiple speed ratios according to claim 2, characterized in that: The blind shaft (306) is arranged at the connection between the upper box body (3221) and the middle box body (3222), and the central axis of the blind shaft (306) and the connection line between the upper box body (3221) and the middle box body (3222) are on the same horizontal plane; the through shaft (301) is arranged at the connection between the middle box body (3222) and the lower box body (3223), and the central axis of the through shaft (301) and the connection line between the middle box body (3222) and the lower box body (3223) are on the same horizontal plane.

5. The asynchronous rolling mill with multiple speed ratios according to claim 2, characterized in that: Two assembly rings (3225) are symmetrically arranged on the upper surface of the upper box body (3221).

6. The asynchronous rolling mill with multiple speed ratios according to claim 4, characterized in that: A filter (3226) is provided on the upper surface of the upper box body (3221).

7. The asynchronous rolling mill with multiple speed ratios according to claim 1, characterized in that: The angle between the axis of the cross-axis universal coupling (4) and the horizontal line is 0° to 5°.

8. The asynchronous rolling mill with multiple speed ratios according to claim 1, characterized in that: The shift support rod (318) is threadedly connected to the shift rack (317), and the shift support rod (318) is a non-cylindrical structure.

9. The asynchronous rolling mill with multiple speed ratios according to claim 1, characterized in that: The transmission ratio i of the gear base (3) is 0.8-1.25.

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