A medium-speed mill anti-fracture pull rod structure

Abstract

The utility model discloses a kind of medium-speed mill anti-fracture pull rod structure, it is related to the technical field of powder grinding, including the pull rod component for being used to apply the pull of downward to mill roller;The butt joint of the pull rod of pull rod component component is connected between multiple pull rod bodies by pull rod;The butt joint end of pull rod body is successively formed with root outer cylindrical surface, outer circular surface, outer conical surface and butt joint end outer cylindrical surface;The diameter of root outer cylindrical surface is less than the diameter of butt joint end outer cylindrical surface, and outer circular surface and outer conical surface form the size diameter transition section between root outer cylindrical surface and butt joint end outer cylindrical surface;The inside of pull rod butt joint hoop sleeve is formed with inner cylindrical surface, inner conical surface, inner circular surface and root inner cylindrical surface.The utility model makes the cooperation between pull rod body and pull rod butt joint hoop sleeve more closely, stress distribution is more uniform, effectively avoids stress concentration, thereby reduce the risk of pull rod fracture, improve the service life and reliability of pull rod.

Description

Technical Field

[0001] This utility model relates to the field of powder grinding technology, and more specifically to a fracture-resistant tie rod structure for a medium-speed mill. Background Technology

[0002] The structure of the MPS (ZGM) medium-speed mill is as follows: Figure 1 As shown, three grinding rollers are mounted below a pressure frame, which is connected to three evenly distributed tie rod devices. Each tie rod device has a hydraulic cylinder connected to its lower end, and the hydraulic cylinders are fixed to the foundation. During medium-speed mill operation, the hydraulic cylinders apply a downward pulling force to the grinding rollers through the tie rod devices and the pressure frame, ensuring that the grinding rollers exert sufficient grinding pressure on the raw coal.

[0003] The structure of the tie rod device is as follows Figure 2 As shown, it includes an upper pull rod, a lower pull rod, and a pull rod sleeve. The upper end of the upper pull rod is connected to the pressure frame. The upper and lower pull rods are connected by the pull rod sleeve, and the lower end of the lower pull rod is connected to the hydraulic cylinder by the pull rod sleeve. The pull rod sleeve has a two-flanged structure, and the two flanges are tightened together by bolts, as shown. Figure 3 and Figure 4 As shown, inner cylindrical surface A is located at the upper and lower ends of the pull rod sleeve, and inner cylindrical surface B is located in the middle of the pull rod sleeve. Inner cylindrical surfaces A and B form two end faces. The pull rod end mates with the pull rod sleeve, and the structure of the pull rod end is as follows... Figure 5 As shown, it consists of an outer cylindrical surface A, an outer cylindrical surface B, and an end face. After the tie rod end is assembled, the tie rod sleeve radially limits the tie rod through the inner cylindrical surface B, and axially limits the tie rod through the end face B, as shown. Figure 6 As shown.

[0004] The primary failure mode of the tie rod assembly is fracture at the outer cylindrical surface A near the end face of the tie rod. Stress analysis of the original tie rod assembly revealed severe stress concentration at the transition point between the outer cylindrical surface A and the end face, which is the main cause of tie rod fracture at this location. Therefore, optimizing the tie rod sleeve and the tie rod end structure to perfectly solve the problem of tie rod fracture is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] In view of this, the present invention provides a medium-speed grinding anti-breakage tie rod structure, which aims to solve the above-mentioned technical problems.

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

[0007] A breakage-resistant tie rod structure for a medium-speed mill includes a tie rod component for applying a downward pulling force to the mill roller; the multiple tie rod bodies of the tie rod component are connected by tie rod mating sleeves.

[0008] The connecting end of the tie rod body is sequentially formed with a root outer cylindrical surface, an outer arc surface, an outer conical surface, and a connecting end outer cylindrical surface; the diameter of the root outer cylindrical surface is smaller than the diameter of the connecting end outer cylindrical surface, and the outer arc surface and the outer conical surface form a diameter transition section between the root outer cylindrical surface and the connecting end outer cylindrical surface.

[0009] The inner center of the tie rod coupling sleeve has an inner cylindrical surface corresponding to the outer cylindrical surface of the docking end, and symmetrically located on both sides of the inner cylindrical surface of the docking end, corresponding to the outer conical surface, outer arc surface, and root outer cylindrical surface, respectively. The taper of the inner conical surface is the same as that of the outer conical surface, and the inner conical surface is used for axial and radial positioning of the tie rod body.

[0010] Through the above technical solution, the connecting end of the pull rod body of this utility model sequentially forms a root outer cylindrical surface, an outer arc surface, an outer conical surface, and a connecting end outer cylindrical surface. The outer arc surface and the outer conical surface form a diameter transition section between the root outer cylindrical surface and the connecting end outer cylindrical surface. The inner center of the pull rod connecting sleeve forms a connecting end inner cylindrical surface corresponding to the connecting end outer cylindrical surface, as well as symmetrically located on both sides of the connecting end inner cylindrical surface, an inner conical surface, an inner arc surface, and a root inner cylindrical surface. This structural design makes the fit between the pull rod body and the pull rod connecting sleeve tighter, the stress distribution more uniform, and effectively avoids stress concentration, thereby reducing the risk of pull rod breakage and improving the service life and reliability of the pull rod.

[0011] Preferably, in the above-mentioned medium-speed wear-resistant anti-fracture tie rod structure, a wedge-shaped groove is provided on the mating end face of either of the two tie rod bodies, and a wedge-shaped block is provided in the wedge-shaped groove. The wedge-shaped block is pressed against the bottom of the wedge-shaped groove and the mating end face of the other tie rod body.

[0012] Preferably, in the above-mentioned medium-speed wear anti-fracture tie rod structure, the side wall of the tie rod coupling sleeve is symmetrically provided with threaded holes corresponding to the inner cylindrical surface of the coupling end. The two threaded holes correspond to the wedge groove, and an adjusting bolt is threaded onto the threaded holes. The adjusting bolt is used to push the wedge block and adjust the clamping force between the wedge block and the wedge groove to ensure that the tie rod body and the tie rod coupling sleeve are always in a compressed state. Under the action of the adjusting bolt, the wedge block presses the tie rod body up and down, pressing the tie rod body tightly onto the inner conical surface of the tie rod coupling sleeve.

[0013] Preferably, in the above-mentioned medium-speed grinding anti-fracture tie rod structure, a conical bushing is provided between the outer conical surface and the inner conical surface to ensure that the inner conical surface and the outer conical surface are subjected to uniform force.

[0014] Preferably, in the above-mentioned medium-speed wear anti-fracture tie rod structure, the tapered bushing is a split structure.

[0015] Preferably, in the above-mentioned medium-speed wear anti-fracture tie rod structure, the tapered bushing is made of aluminum or copper. Utilizing its easily deformable characteristics, it fills the gap between the tie rod body and the tie rod mating sleeve, thus preventing localized stress concentration in the tie rod.

[0016] Preferably, in the above-mentioned medium-speed wear-resistant anti-fracture tie rod structure, the taper α of the outer conical surface is between 40° and 60°.

[0017] Preferably, in the above-mentioned medium-speed grinding anti-fracture tie rod structure, the tie rod connecting sleeve is formed by two half-structures connected by bolts.

[0018] As can be seen from the above technical solution, compared with the prior art, this utility model discloses a medium-speed wear anti-breakage tie rod structure, which has the following beneficial effects:

[0019] 1. Optimize structural design: By improving the structure of the tie rod body and the tie rod coupling sleeve, the fit is made tighter and the stress distribution is more uniform, effectively avoiding stress concentration, thereby reducing the risk of tie rod breakage and improving the service life and reliability of the tie rod.

[0020] 2. Enhance connection strength: Add wedge grooves and wedge block structures, and adjust the tightening force by adjusting bolts to further enhance the connection strength between the tie rod bodies, prevent relative displacement or loosening during the stress process, and improve the stability of the tie rod structure.

[0021] 3. Improve the uniformity of stress distribution: A conical bushing is placed between the outer and inner conical surfaces to ensure uniform stress distribution and avoid deformation or damage caused by uneven local stress, thereby further improving the stability and reliability of the tie rod structure.

[0022] 4. Easy to maintain and adjust: The use of a split-structure tapered bushing and a two-half structure tie rod coupling sleeve facilitates installation, disassembly, maintenance and replacement. It also facilitates the inspection and adjustment of the fit between the tie rod body and the tie rod coupling sleeve, improving the maintainability of the tie rod structure.

[0023] 5. Optimize material selection: Select tapered bushings made of aluminum or copper, taking advantage of their good ductility and toughness to better fill gaps, avoid local stress concentration, further improve the stability and reliability of the tie rod structure, and extend the service life of the tie rod.

[0024] 6. Facilitates manufacturing: By limiting the taper range of the outer conical surface, the fit between the tie rod body and the tie rod mating sleeve is made tighter and more stable, while also facilitating the manufacturing of the tie rod body and the tie rod mating sleeve. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0026] Figure 1 The attached figure is a schematic diagram of the structure of a medium-speed coal mill in the prior art;

[0027] Figure 2 The attached figure is a schematic diagram of a tie rod device in the prior art;

[0028] Figure 3 The attached figure is an external view of a pull rod sleeve in the prior art;

[0029] Figure 4 The attached figure is a structural diagram of a semi-pull rod sleeve in the prior art;

[0030] Figure 5 The attached figure is a schematic diagram of the end of a tie rod in the prior art;

[0031] Figure 6 The attached figure is a schematic diagram of the assembly of the tie rod sleeve and the end of the tie rod in the prior art;

[0032] Figure 7 The attached figure is a schematic diagram of the anti-fracture tie rod structure for medium-speed grinding provided by this utility model;

[0033] Figure 8 The attached figure is a top view of the end of the pull rod body provided by this utility model.

[0034] Figure 9 The attached figure is a structural schematic diagram of the end of the pull rod body provided by this utility model from a bottom view angle;

[0035] Figure 10 The attached figure is an end cross-sectional view of the pull rod body provided by this utility model;

[0036] Figure 11 The attached figure is a schematic diagram of the internal structure of the tie rod coupling sleeve provided by this utility model;

[0037] Figure 12 The attached figure is a schematic diagram of the tapered bushing provided by this utility model;

[0038] Figure 13 The attached figure is a schematic diagram of the wedge block provided by this utility model.

[0039] in:

[0040] 1-Grinding roller; 2-Pressure frame; 3-Tie rod device; 4-Hydraulic cylinder; 5-Upper tie rod; 6-Lower tie rod; 7-Tie rod sleeve; 8-Inner cylindrical surface A; 9-Inner cylindrical surface B; 10-Outer cylindrical surface A; 11-Outer cylindrical surface B; 12-End face; 13-Tie rod body; 14-Tie rod mating sleeve; 15-Root outer cylindrical surface; 16-Outer arc surface; 17-Outer conical surface; 18-Mating end outer cylindrical surface; 19-Mating end inner cylindrical surface; 20-Inner conical surface; 21-Inner arc surface; 22-Root inner cylindrical surface; 23-Wedge groove; 24-Wedge block; 25-Threaded hole; 26-Adjusting bolt; 27-Conical bushing. Detailed Implementation

[0041] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0042] See appendix Figure 7 To be continued Figure 11 This utility model discloses a medium-speed grinding anti-breakage tie rod structure, including a tie rod component for applying a downward pulling force to the grinding roller 1; the multiple tie rod bodies 13 of the tie rod component are connected by tie rod connecting sleeves 14;

[0043] The connecting end of the tie rod body 13 is sequentially formed with a root outer cylindrical surface 15, an outer arc surface 16, an outer conical surface 17, and a connecting end outer cylindrical surface 18; the diameter of the root outer cylindrical surface 15 is smaller than the diameter of the connecting end outer cylindrical surface 18, and the outer arc surface 16 and the outer conical surface 17 form a diameter transition section between the root outer cylindrical surface 15 and the connecting end outer cylindrical surface 18;

[0044] The inner center of the tie rod coupling sleeve 14 has an inner cylindrical surface 19 corresponding to the outer cylindrical surface 18 of the docking end, and an inner conical surface 20, an inner arc surface 21, and an inner cylindrical surface 22 symmetrically located on both sides of the inner cylindrical surface 19 of the docking end, corresponding to the outer conical surface 17, the outer arc surface 16, and the root outer cylindrical surface 15, respectively.

[0045] See appendix Figure 7 Appendix Figure 9 Appendix Figure 10 and attached Figure 13A wedge-shaped groove 23 is formed on the mating end face of either of the two tie rod bodies 13. A wedge-shaped block 24 is provided in the wedge-shaped groove 23. The wedge-shaped block 24 is pressed against the bottom of the wedge-shaped groove 23 and the mating end face of the other tie rod body 13. Through the cooperation between the wedge-shaped block 24 and the wedge-shaped groove 23, the connection strength between the tie rod bodies 13 is further enhanced, so that the two tie rod bodies 13 can fit together more tightly when mating, further preventing relative displacement or loosening of the tie rod bodies 13 during the stress process, thereby improving the stability of the entire tie rod structure.

[0046] To further optimize the above technical solution, threaded holes 25 are symmetrically provided on the side wall of the tie rod coupling sleeve 14 corresponding to the inner cylindrical surface 19 of the docking end. The two threaded holes 25 correspond to the wedge grooves 23, and adjusting bolts 26 are threadedly connected to the threaded holes 25. The adjusting bolts 26 are used to push the wedge block 24 and adjust the clamping force between the wedge block 24 and the wedge groove 23. By adjusting the adjusting bolts 26, the clamping force between the wedge block 24 and the wedge groove 23 can be precisely controlled, ensuring that the tie rod body 13 and the tie rod coupling sleeve 14 are always in a compressed state, so that the tie rod body 13 is more firmly pressed onto the inner conical surface 20 of the tie rod coupling sleeve 14, further enhancing the stability and reliability of the tie rod structure, and also helping to extend the service life of the tie rod.

[0047] To further optimize the above technical solution, a tapered bushing 27 is provided between the outer conical surface 17 and the inner conical surface 20. The tapered bushing 27 can further ensure that the inner conical surface 20 and the outer conical surface 17 are subjected to uniform force, avoiding deformation or damage to the tie rod body 13 or the tie rod connecting sleeve 14 due to uneven local force, thereby further improving the stability and reliability of the tie rod structure, and also reducing the risk of tie rod breakage.

[0048] See appendix Figure 12 The tapered bushing 27 has a split structure. The split structure of the tapered bushing 27 facilitates installation and disassembly, improves the convenience of maintenance and replacement, and also facilitates the inspection and adjustment of the fit between the tie rod body 13 and the tie rod mating sleeve 14, further improving the maintainability and reliability of the tie rod structure.

[0049] To further optimize the above technical solution, the tapered bushing 27 is made of aluminum or copper. Aluminum or copper has good ductility and toughness, and is easy to deform, which can better fill the gap between the tie rod body 13 and the tie rod mating sleeve 14, further avoiding local stress concentration in the tie rod, thereby improving the stability and reliability of the tie rod structure, and also extending the service life of the tie rod.

[0050] In this embodiment, the taper α of the outer conical surface 17 is between 40° and 60°. Limiting the taper range of the outer conical surface 17 ensures a tighter and more stable fit between the tie rod body 13 and the tie rod mating sleeve 14, further optimizing stress distribution, improving the tensile strength and reliability of the tie rod structure, and also facilitating the processing and manufacturing of the tie rod body and the tie rod mating sleeve.

[0051] To further optimize the above technical solution, the tie rod coupling sleeve 14 is formed by bolting together a two-splitter structure. The two-splitter structure of the tie rod coupling sleeve 14 facilitates installation and disassembly, improving the convenience of maintenance and replacement. It also facilitates the inspection and adjustment of the fit between the tie rod body 13 and the tie rod coupling sleeve 14, further enhancing the maintainability and reliability of the tie rod structure.

[0052] This embodiment improves the stress state at the end of the tie rod by optimizing the structure of the tie rod end and the tie rod sleeve structure, significantly reduces the stress in the weak parts of the tie rod end, and improves the tensile strength of the entire tie rod, thus fundamentally solving the problem of tie rod breakage.

[0053] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0054] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A medium-speed grinding anti-breakage tie rod structure, comprising a tie rod component for applying a downward pulling force to a grinding roller (1); the multiple tie rod bodies (13) of the tie rod component are connected by tie rod connecting sleeves (14); characterized in that: The connecting end of the tie rod body (13) is sequentially formed with a root outer cylindrical surface (15), an outer arc surface (16), an outer conical surface (17), and a connecting end outer cylindrical surface (18); the diameter of the root outer cylindrical surface (15) is smaller than the diameter of the connecting end outer cylindrical surface (18), and the outer arc surface (16) and the outer conical surface (17) form a diameter transition section between the root outer cylindrical surface (15) and the connecting end outer cylindrical surface (18); The inner middle of the tie rod coupling sleeve (14) has an inner cylindrical surface (19) corresponding to the outer cylindrical surface (18) of the docking end, and an inner conical surface (20), an inner arc surface (21), and a root inner cylindrical surface (22) symmetrically located on both sides of the inner cylindrical surface (19) of the docking end, respectively corresponding to the outer conical surface (17), the outer arc surface (16), and the root outer cylindrical surface (15).

2. A break-resistant tie rod structure for a medium speed mill according to claim 1, wherein A wedge-shaped groove (23) is provided on the mating end face of either of the two pull rod bodies (13), and a wedge-shaped block (24) is provided in the wedge-shaped groove (23). The wedge-shaped block (24) is pressed against the bottom of the wedge-shaped groove (23) and the mating end face of the other pull rod body (13).

3. A break-resistant tie rod structure for a medium speed mill according to claim 2, wherein The side wall of the tie rod coupling sleeve (14) is symmetrically provided with threaded holes (25) corresponding to the inner cylindrical surface (19) of the docking end. The two threaded holes (25) correspond to the wedge groove (23). An adjusting bolt (26) is threadedly connected to the threaded hole (25). The adjusting bolt (26) is used to push the wedge block (24) and adjust the clamping force between the wedge block (24) and the wedge groove (23).

4. A break-resistant tie rod structure for a medium speed mill according to claim 1, wherein A conical bushing (27) is provided between the outer conical surface (17) and the inner conical surface (20).

5. A break-resistant tie rod structure for a medium speed mill according to claim 4 wherein, The tapered bushing (27) has a split structure.

6. A break-resistant tie rod structure for a medium speed mill according to claim 4 wherein, The tapered bushing (27) is made of aluminum or copper.

7. A break-resistant tie rod structure for a medium speed mill according to claim 1, wherein The taper α of the outer conical surface (17) is between 40° and 60°.

8. A break-resistant tie rod structure for a medium speed mill according to claim 1, wherein The tie rod coupling sleeve (14) is formed by bolting two half-structures.

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