A Compact Integrally Forged Hydraulic Thrust Roller Device for Rotary Kiln

Abstract

The present invention relates to a compact integral forging hydraulic thrust wheel device for a rotary kiln. The integral forging thrust wheel is integrally forged with the thrust wheel and the thrust wheel shaft as an integral structure, and is rotatably arranged on the thrust wheel support through bearings. The outer angle of the wheel part is 9-11°. The bearings include two sets of spherical roller bearings and two sets of thrust ball bearings. There is one set of thrust ball bearings between the two sets of spherical roller bearings, and another set of thrust ball bearings is arranged at the bottom of the thrust wheel, solving the problem of the coaxiality of the thrust wheel assembly, improving the force distribution of the thrust wheel, making the horizontal and vertical component forces borne by the bearings less than those of conventional hydraulic thrust wheels, effectively improving the problems of easy offloading and easy damage of the bearings in the existing hydraulic thrust wheel device, and having a compact structure, light weight and low manufacturing cost.

Description

Technical Field

[0001] The invention relates to the field of hydraulic stop wheels for rotary kilns, and in particular to a compact integrally forged hydraulic stop wheel device for rotary kilns. Background Art

[0002] The rotary kiln is a thermal equipment commonly used in the industrial field. It is generally used under high temperature conditions. During operation, it has a large axial elongation in a relatively cold state. This elongation causes the wheel tyre and the large ring gear on the rotary kiln cylinder to have a large axial displacement, which correspondingly causes uneven friction with the supporting wheel and the small gear. The hydraulic wheel blocking device can promote the periodic movement of the cylinder along the axial direction, thus avoiding this uneven friction.

[0003] Traditional hydraulic trolleys generally consist of a trolley, a trolley shaft or hollow shaft, a hydraulic cylinder, a single thrust bearing, and a double tapered roller bearing. To save manufacturing costs, the trolley and trolley shaft are separated. This makes it difficult to control the coaxiality of the split trolley during assembly. Furthermore, due to the stress distribution on the trolley, the split trolley is prone to unbalanced loading during use. This unbalanced loading can quickly damage the bearings, causing the rotary kiln to shut down and significantly complicate production. Summary of the Invention

[0004] In view of the defects of the prior art, the purpose of the present invention is to provide a compact integrally forged hydraulic stopper wheel device for a rotary kiln. The device adopts an integrally forged stopper wheel and effectively improves the stress condition of the stopper wheel by changing the stopper wheel angle and the bearing arrangement, thereby increasing the service life of the bearing and improving the operation rate of the rotary kiln. The device also makes the stopper wheel structure more compact and reduces the manufacturing cost of the hydraulic stopper wheel.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] A compact integrally forged hydraulic throttle device for a rotary kiln comprises a hydraulic cylinder, an integrally forged throttle, a throttle support, and a bearing. The integrally forged throttle is formed by forging the throttle and the throttle shaft as an integral structure. The integrally forged throttle is rotatably arranged on the throttle support via a bearing, and the outer angle of the wheel portion is 9-11 degrees. The bearing comprises two sets of spherical roller bearings and two sets of thrust ball bearings, which are alternately arranged on the throttle shaft.

[0007] Specifically, on the retaining wheel shaft, there is a set of thrust ball bearings between the two sets of spherical roller bearings, and another set of thrust ball bearings is arranged at the bottom of the retaining wheel.

[0008] Furthermore, the stopper shaft of the integrally forged stopper wheel has a stepped structure, and the inner seat of the stopper wheel support has a stepped structure that matches the stopper shaft. When the two are matched, the first spherical roller bearing, the first thrust ball bearing, the second spherical roller bearing and the second thrust ball bearing are arranged from top to bottom respectively.

[0009] Furthermore, a double-layer Y-shaped rubber pad is used for pressing and sealing between the integrally forged retaining wheel and the retaining wheel support.

[0010] Beneficial effects: By using the integrally forged retaining wheel, the stability of the equipment is enhanced. By adjusting the angle of the end of the retaining wheel and changing the distribution of the bearings on the retaining wheel, the horizontal and vertical forces on the retaining wheel are changed, making the structure of the retaining wheel more compact. It has the characteristics of simple and compact structure, small floor area, and low failure rate. It completely changes the phenomenon of bearing damage caused by eccentric load due to the split structure of the hydraulic retaining wheel and the retaining wheel shaft and only one thrust bearing, reduces the maintenance times of the rotary kiln equipment, improves the operating rate of the rotary kiln equipment, reduces the equipment maintenance cost, and improves the economic benefits of the factory. Description of the Drawings

[0011] Figure 1 It is a schematic structural diagram of the hydraulic retaining wheel device of the present invention;

[0012] Figure 2 It is a schematic structural diagram of the integrally forged retaining wheel of the present invention;

[0013] Figure 3 It is a schematic structural diagram of a conventional hydraulic retaining wheel of the prior art.

[0014] Reference numerals: 1. Hydraulic cylinder device; 2. Integrally forged retaining wheel; 3. First spherical roller bearing; 4. First thrust ball bearing; 5. Second spherical roller bearing; 6. Second thrust ball bearing; 7. Retaining wheel support. Detailed Embodiments

[0015] The present invention will be further described in detail below with reference to the drawings and specific embodiments.

[0016] As Figure 1 shown, the hydraulic retaining wheel device of the present invention includes a hydraulic cylinder device 1, an integrally forged retaining wheel 2, a first spherical roller bearing 3, a first thrust ball bearing 4, a second spherical roller bearing 5, a second thrust ball bearing 6, and a retaining wheel support 7. The integrally forged retaining wheel 2 is integrally forged with the retaining wheel and the retaining wheel shaft as a whole structure, and is installed on the retaining wheel support 7 through the first spherical roller bearing 3, the first thrust ball bearing 4, the second spherical roller bearing 5, and the second thrust ball bearing 6.

[0017] The contact angle between the integrally forged retaining wheel 2 and the girth gear is 9° to 11°, which is much smaller than the traditional 13° to 16°. In this way, the horizontal component force of the retaining wheel increases, and the vertical component force decreases accordingly. Moreover, the present invention uses four bearings for support. There is a set of thrust ball bearings between two sets of spherical roller bearings, and another set of thrust ball bearings is arranged at the bottom of the retaining wheel. This structure increases the horizontal component force of the retaining wheel, reduces the distance between the two sets of spherical roller bearings, makes the structure of the integrally forged retaining wheel more compact, greatly reduces the weight, and also reduces the production cost.

[0018] A double-layer Y-shaped rubber pad is used to tightly seal between the integrally forged retaining wheel 2 and the retaining wheel support 7. On the one hand, it prevents dust from entering the bearing, and on the other hand, it prevents the lubricating oil of the bearing from leaking out. This structure has lower processing costs and better sealing effects compared to the labyrinth seal.

[0019] The working principle of the present invention is as follows: The hydraulic cylinder device 1 pushes the retaining wheel support 7, the retaining wheel support 7 pushes two spherical roller bearings, and then pushes the integrally forged retaining wheel 2 to drive the rotary kiln to move in the axial direction.

[0020] The hydraulic retaining wheel device of the present invention has the following advantages:

[0021] (1) Because the integrally forged retaining wheel adopts a compact support design, the distance among the integrally forged retaining wheel, the first spherical roller bearing, and the second spherical roller bearing is significantly reduced, resulting in a smaller radial force on the first spherical roller bearing and the second spherical roller bearing. Under the condition of meeting the strength condition of the shaft, the diameter of the shaft is relatively small.

[0022] (2) The distance among the integrally forged retaining wheel, the first spherical roller bearing, and the second spherical roller bearing is significantly reduced, the length of the shaft of the integrally forged retaining wheel becomes smaller. According to the calculation formula for checking the stability of the rod, the axial deformation of the shaft of the integrally forged retaining wheel is significantly reduced, the deformation of the inner and outer rings of the bearing is reduced, and the stability of the bearing is significantly enhanced.

[0023] (3) Compared with the structural form of the split retaining wheel and the assembled retaining wheel shaft, there is no error in the coaxiality of the retaining wheel and the coaxiality of the retaining wheel shaft. The coaxiality between the integrally forged retaining wheel and the retaining wheel support is easier to control, and the probability of eccentric load is lower.

[0024] To better illustrate the advantages of the hydraulic retaining wheel device of the present invention, the following is a calculation and analysis of the forces on the retaining wheel in combination with examples. Assuming that the forces on the hydraulic retaining wheel of the present invention and the conventional hydraulic retaining wheel are the same, and the heights of the lowest support point and the midpoint of the retaining wheel are the same (i.e., the heights of the entire hydraulic retaining wheel are the same), the forces on the retaining wheel of the present invention and the conventional hydraulic retaining wheel are calculated respectively and compared.

[0025] 1. Calculation example of the hydraulic retaining wheel device of the present invention.

[0026] As shown Figure 2 in the figure, assuming that the uniformly distributed load on the thrust wheel is q and the length is l, then the force on the thrust wheel is F, and F = ql;

[0027] Assuming that the angle of the thrust wheel is γ, the vertical component force on the thrust wheel is F t , and the horizontal component force is F r . From their geometric relationship, it can be known that:

[0028] F t = F·sinγ

[0029] F r = F·cosγ;

[0030] Assuming that the fulcrum of the first spherical roller bearing is A, the fulcrum of the second spherical roller bearing is B, the fulcrum of the first thrust ball bearing is C, and the fulcrum of the second thrust ball bearing is D; the length from the first spherical roller bearing to the center point of the thrust wheel is L1, and the cross-sectional area of the shaft where it is located is A1; the length from the second spherical roller bearing to the first spherical roller bearing is L2, and the cross-sectional area of the shaft where it is located is A2; the length from the first thrust ball bearing to the center point of the thrust wheel is l′1, and the length from the second thrust ball bearing to the first thrust ball bearing is l′2;

[0031] The reaction force received by the first spherical roller bearing is R a ;

[0032] The reaction force received by the second spherical roller bearing is R b ;

[0033] The axial force of the first thrust ball bearing is F1;

[0034] The axial force of the second thrust ball bearing is F2;

[0035] 1) Solving the radial force of each fulcrum

[0036] According to the bending stress at point A being 0, list the bending equilibrium equation:

[0037] F r ·L1 - R b L2 = 0

[0038]

[0039] According to the radial equilibrium equation:

[0040] R a - F r - R b = 0

[0041]

[0042] 2) Solution of the axial force of each fulcrum

[0043] According to the equilibrium condition, the compression deformation Δl1 of section A1 and the compression deformation Δl2 of section A2 are equal in magnitude.

[0044]

[0045]

[0046] Similarly, it can be obtained that:

[0047]

[0048] In view of the above equilibrium condition, there is:

[0049] Δl1 = Δl2

[0050]

[0051] Also, there is:

[0052] F t = F1 + F2

[0053] Then it is obtained that:

[0054]

[0055]

[0056] Assume that the force on the retaining wheel F = 1.2×10 6 N, and the height of the lowest fulcrum from the center point of the retaining wheel is 499 mm;

[0057] The angle of the retaining wheel is γ = 10.7°;

[0058] Then the vertical component force and the horizontal component force on the retaining wheel are F t 、F r ;

[0059] F t = F·sinγ = 2.22×10 5 N [[ID=6�]]

[0060] F r = F·cosγ = 1.18×10 6 N;

[0061] The length of the first spherical roller bearing from the center point of the retaining wheel is L1 = 137.5 mm, the length of the second spherical roller bearing from the first spherical roller bearing is L2 = 230.5 mm, and the length of the first thrust ball bearing from the center point of the retaining wheel is l′1 = 275.5 mm. The cross-sectional area of the shaft where it is located is: The distance between the second thrust ball bearing and the first thrust ball bearing is l′2=223.5 mm, and the cross-sectional area of the shaft is:

[0062] After calculation:

[0063] The reaction force on the first spherical roller bearing is

[0064] The reaction force on the second spherical roller bearing is

[0065] The axial force of the first thrust ball bearing is

[0066] The axial force of the second thrust ball bearing is

[0067]

[0068] 2. Calculation example of conventional hydraulic wheel chock device

[0069] Conventional hydraulic chocks such as Figure 3 As shown in the figure, the throttle wheel and the throttle wheel shaft are of split design. Three sets of bearings are distributed on the throttle wheel shaft from top to bottom, namely the first spherical roller bearing 3, the second spherical roller bearing 5, and the first thrust ball bearing 4. The height from the lowest fulcrum to the center of the throttle wheel is 499 mm. Assuming that the uniformly distributed load on the throttle wheel is q and the length is l, the force on the throttle wheel is F = ql = 1.2 × 10 6 N;

[0070] In order to indicate the difference, a downward “常” is added in the calculation of conventional hydraulic wheel blocking devices.

[0071] The angle of the blocking wheel is γ 常 =15°

[0072] The vertical and horizontal components of the force on the wheel are F 常t 、F 常r

[0073] From their geometric relationship we can see that:

[0074] F 常t =F·sinγ=3.106×10 5 N;

[0075] F 常r =F·cosγ=1.159×10 6 N.

[0076] Assume that the fulcrum of the first spherical roller bearing is A and the fulcrum of the second spherical roller bearing is B.

[0077] The fulcrum of the first thrust ball bearing is C;

[0078] The length from the first spherical roller bearing to the center point of the thrust wheel is L 常1 =175mm

[0079] The length from the second spherical roller bearing to the first spherical roller bearing is L 常2 =271mm;

[0080] The reaction force on the first spherical roller bearing is R 常a ;

[0081] The reaction force on the second spherical roller bearing is R 常b ;

[0082] The axial force of the first thrust ball bearing is F 常1 ;

[0083] 1) Solution of the radial force at each support point

[0084]

[0085] According to the radial balance equation:

[0086]

[0087] 2) Solution of the axial force at each support point

[0088] F 常t =F 常1 =3.106×10 5 N

[0089] Under the same conditions, the force conditions of the hydraulic thrust wheel device of the present invention and the conventional hydraulic thrust wheel are compared and analyzed as shown in the following table:

[0090] Table 1 Comparative analysis results

[0091]

[0092] The above calculation and analysis show that:

[0093] (1) The horizontal components of the hydraulic thrust wheel device of the present invention (the reaction forces at points A and B) are both smaller than those of the conventional hydraulic thrust wheel device (the reaction forces at points A and B). Among them, the reaction force at point A of the present invention (1.88×10 6 N) is smaller than that of the conventional hydraulic thrust wheel device (1.908×10 6 N) by about 1.33%; the reaction force at point B (7.034×10 5 N) is reduced by about 6.41% compared with the conventional hydraulic thrust wheel device (7.485×10 5 N).

[0094] (2) The vertical component force of the hydraulic thrust roller device of the present invention is less than that of the conventional hydraulic thrust roller device, and the maximum axial force is 2.074×10 5 N, which is less than 3.11×10 5 N of the conventional hydraulic thrust roller device, approximately 49.74%

[0095] In the present invention, the thrust roller and the thrust roller shaft are taken as an integral structure, and by adjusting the angle of the end of the thrust roller and the arrangement of the support bearings, the force distribution of the thrust roller is improved, so that the horizontal component force and the vertical component force borne by the bearing are both less than those of the conventional hydraulic thrust roller, effectively improving the problems of easy eccentric loading and easy damage of the bearing in the existing hydraulic thrust roller device, and having the advantages of compact structure, light weight and low manufacturing cost.

[0096] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Although the present invention has been disclosed above with the preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to equivalent embodiments by using the above-disclosed technical content within the scope of the technical solution of the present invention. However, as long as it does not depart from the content of the technical solution of the present invention, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A compact integral forging hydraulic thrust roller device for a rotary kiln, comprising a hydraulic cylinder, an integral forging thrust roller, a thrust roller support, and a bearing, characterized in that, The overall forged retaining wheel is integrally forged with the retaining wheel and the retaining wheel shaft as an integral structure. The overall forged retaining wheel is rotatably arranged on the retaining wheel support through bearings. The outer angle of the wheel part is 9-11°. The bearings include two sets of spherical roller bearings and two sets of thrust ball bearings, which are arranged alternately on the retaining wheel shaft. The retaining wheel shaft of the overall forged retaining wheel has a stepped structure with a larger upper part and a smaller lower part. The first spherical roller bearing, the first thrust ball bearing, the second spherical roller bearing and the second thrust ball bearing are arranged from top to bottom respectively. The overall forged retaining wheel adopts a compact support design. A first thrust ball bearing is arranged between the two sets of spherical roller bearings, and a second thrust ball bearing is arranged at the bottom of the retaining wheel.

2. The compact integral forging hydraulic thrust roller device for rotary kiln according to claim 1, wherein, The inner seat of the retaining wheel support has a stepped structure matching the retaining wheel shaft.

3. The compact integral forging hydraulic thrust roller device for rotary kiln according to claim 1, wherein, Between the overall forged retaining wheel and the retaining wheel support, a double-layer Y-shaped rubber pad is used for pressing and sealing.

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