A bolt assembly disassembly tool

Abstract

This utility model discloses a bolt assembly disassembly and assembly tool for disassembling and assembling bolt assemblies on a cylinder head. It relates to the technical field of disassembly and assembly tools and includes a hydraulic tensioning device and a support cylinder. A first cutting part is provided on one side of the support cylinder, and a nut lever operating window is provided on the first cutting part, communicating with the inner hole of the support cylinder. The support cylinder is used to sleeve the bolt assembly and support it between the cylinder head and the hydraulic tensioning device. The first cutting part corresponds to the edge of the cylinder head to prevent the support cylinder from being suspended and tilting or tipping over. The nut lever operating window corresponds to the nut of the bolt assembly to facilitate tightening the nut. The hydraulic tensioning device is used to connect with the bolt thread of the bolt assembly and stretch the bolt to create a tightening gap between the nut and the cylinder head. This utility model's bolt assembly disassembly and assembly tool ensures smooth disassembly and assembly of bolt assemblies, reduces the difficulty of disassembly and assembly, and improves work efficiency.

Description

Technical Field

[0001] This utility model relates to the field of disassembly and assembly tools, specifically to a bolt assembly disassembly and assembly tool. Background Technology

[0002] As diesel engines become increasingly robust, hydraulic tensioning tools are used to disassemble and install the bolt assemblies on the cylinder head, connecting rod, and main bearing cap to ensure reliable connections and ease of disassembly and assembly.

[0003] However, due to the compact structure of the cylinder head, the distance between the nut of the bolt assembly and the edge of the cylinder head is small in some areas, causing the hydraulic tensioning tool to be suspended in the air and unable to be effectively supported. Therefore, during the disassembly and assembly of the bolt assembly, the hydraulic tensioning tool often tilts and flips, getting stuck with the nut and unable to be disassembled or assembled normally, which increases the difficulty of disassembly and assembly and reduces work efficiency. Utility Model Content

[0004] In view of the above-mentioned defects in the existing technology, the present invention provides a bolt assembly disassembly and assembly tool, which can ensure the smooth disassembly and assembly of bolt assemblies, reduce the difficulty of disassembly and assembly, and improve work efficiency.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0006] A bolt assembly disassembly and assembly tool is used for disassembling and assembling bolt assemblies on a cylinder head. It includes a hydraulic tensioning device and a support cylinder. A first cutting section is provided on one side of the support cylinder, and a nut lever operation window is provided on the first cutting section, communicating with the inner hole of the support cylinder. The support cylinder is used to sleeve the bolt assembly and support it between the cylinder head and the hydraulic tensioning device. The first cutting section corresponds to the edge of the cylinder head to prevent the support cylinder from being suspended and tilting or tipping over. The nut lever operation window corresponds to the nut of the bolt assembly to facilitate tightening the nut. The hydraulic tensioning device is used to connect to the bolt thread of the bolt assembly and stretch the bolt to create a tightening gap between the nut and the cylinder head.

[0007] The other side of the support cylinder is provided with a second cutting part, and the second cutting part is provided with an anti-tipping deformation balance window that is connected to the inner hole of the support cylinder.

[0008] The support cylinder is square, and the two corners on one diagonal of the support cylinder form a support part. The two corners on the other diagonal of the support cylinder are cut to form the first cutting part and the second cutting part. The first cutting part and the second cutting part have the same structure. The anti-tipping deformation balance window and the nut lever operation window have the same structure and are arranged symmetrically.

[0009] The support cylinder is provided with a feeler gauge inspection window at one end of the cylinder head, and the feeler gauge inspection window passes through the first cutting part and the second cutting part.

[0010] The hydraulic tensioning device includes a tensioning head for threaded connection with the bolt and a hydraulic cylinder for driving the tensioning head to move. A support and positioning structure is provided between the hydraulic cylinder and the support cylinder.

[0011] The hydraulic cylinder includes an inner cylinder sleeve and an outer cylinder sleeve coaxially sleeved together from the inside out, forming a sealed hydraulic cavity between the inner cylinder sleeve and the outer cylinder sleeve. An oil inlet connected to the hydraulic cavity is provided on the inner cylinder sleeve or the outer cylinder sleeve. The drawing head is T-shaped, and a threaded hole is coaxially provided inside the drawing head. The inner cylinder sleeve has a T-shaped inner hole adapted to the drawing head, and the drawing head is slidably disposed in the T-shaped inner hole.

[0012] The support and positioning structure includes a positioning platform coaxially disposed at the end of the support cylinder and a positioning groove coaxially disposed at the end of the outer cylinder liner. The inner hole of the support cylinder passes through the positioning platform, and the positioning groove is connected to the inner hole of the outer cylinder liner.

[0013] The inner cylinder liner includes a first cylindrical segment, a second cylindrical segment, a third cylindrical segment, and a fourth cylindrical segment connected in sequence with increasing diameters. The inner bore of the outer cylinder liner includes a first circular hole segment, a second circular hole segment, and a third circular hole segment connected in sequence with increasing diameters. The first cylindrical segment is slidably disposed within the first circular hole segment, and a first sealing structure is provided between the first cylindrical segment and the second circular hole segment. The third cylindrical segment is slidably disposed within the third circular hole segment, and a second sealing structure is provided between the third circular hole segment and the second cylindrical segment. The inner cylinder liner, the outer cylinder liner, the first sealing structure, and the second sealing structure together form the hydraulic chamber.

[0014] The oil inlet is located on the fourth cylindrical section, and a hydraulic stroke warning ring is provided on the outer wall of the third cylindrical section.

[0015] The large-diameter section of the stretching head is provided with an internal hexagonal groove that is compatible with an internal hexagonal wrench, and the end of the small-diameter section of the stretching head is provided with a chamfer.

[0016] By adopting the above technical solution, the beneficial effects of this utility model are:

[0017] The bolt assembly disassembly and assembly tool provided by this utility model utilizes a support cylinder to support a hydraulic tensioning device. Because a first cutting section is provided on one side of the support cylinder, and the first cutting section has an operating window for a nut lever that communicates with the inner hole of the support cylinder, the weight of the support cylinder on the side where the first cutting section is located is greatly reduced. Therefore, when the support cylinder is sleeved outside the bolt assembly and the first cutting section corresponds to the edge of the cylinder head, it can effectively prevent the support cylinder from being suspended and tilting or overturning, thereby improving the support stability of the hydraulic tensioning device and preventing it from tilting or overturning. This ensures that the hydraulic tensioning device can be smoothly disassembled and assembled with the bolt assembly. Compared with the prior art, the bolt assembly disassembly and assembly tool of this utility model can ensure the smooth disassembly and assembly of the bolt assembly, reduce the difficulty of disassembly and assembly, and improve work efficiency. Attached Figure Description

[0018] Figure 1 This is a cross-sectional view of an embodiment of the bolt assembly disassembly and assembly tool of this utility model;

[0019] Figure 2 yes Figure 1 Another sectional view of the embodiment;

[0020] Figure 3 yes Figure 1 Assembly diagram of the middle support cylinder and cylinder head;

[0021] Figure 4 yes Figure 3 Schematic diagram of the middle support cylinder;

[0022] Figure 5 yes Figure 4 Sectional view of AA;

[0023] Figure 6 yes Figure 4 Sectional view of BB;

[0024] In the diagram: 1. Support cylinder; 11. First cutting section; 12. Nut lever operation window; 13. Second cutting section; 14. Anti-tipping deformation balance window; 15. Feeler gauge inspection window; 16. Positioning platform; 17. Support section; 2. Tensioning head; 21. Socket hexagonal groove; 3. Hydraulic cylinder; 31. Inner cylinder liner; 32. Outer cylinder liner; 321. Positioning groove; 33. Pipe joint; 34. First sealing structure; 35. Second sealing structure; 36. Hydraulic stroke warning ring; 4. Cylinder head; 5. Bolt; 6. Nut. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for explaining this utility model and are not intended to limit this utility model.

[0026] like Figures 1 to 6 As shown, this embodiment provides a bolt assembly disassembly and assembly tool for disassembling and assembling bolt assemblies on cylinder head 4. It includes a hydraulic tensioning device and a support cylinder 1. A first cutting part 11 is provided on one side of the support cylinder 1, and a nut lever operation window 12 is provided on the first cutting part 11, communicating with the inner hole of the support cylinder 1. The support cylinder 1 is used to sleeve the bolt assembly and support it between the cylinder head 4 and the hydraulic tensioning device. The first cutting part 11 corresponds to the edge of the cylinder head 4 to prevent the support cylinder 1 from being suspended and tilting or tipping over. The nut lever operation window 12 corresponds to the nut 6 of the bolt assembly to facilitate tightening the nut 6. The hydraulic tensioning device is used to thread-connect with the bolt 5 of the bolt assembly and to stretch the bolt 5 to create a tightening gap between the nut 6 and the cylinder head 4.

[0027] The bolt assembly disassembly and assembly tool uses a support cylinder 1 to support the hydraulic tensioning device. Since a first cutting part 11 is provided on one side of the support cylinder 1, and a nut lever operation window 12 connected to the inner hole of the support cylinder 1 is provided on the first cutting part 11, the weight of the support cylinder 1 on the side where the first cutting part 11 is located is greatly reduced. Thus, when the support cylinder 1 is sleeved on the outside of the bolt assembly and the first cutting part 11 corresponds to the edge of the cylinder head, the support cylinder 1 can be effectively prevented from tilting and overturning while suspended in the air. This improves the support stability of the hydraulic tensioning device and prevents the hydraulic tensioning device from tilting and overturning, thereby ensuring that the hydraulic tensioning device can be smoothly disassembled and assembled from the bolt assembly.

[0028] In this embodiment, a second cutting section 13 is provided on the other side of the support cylinder 1, and an anti-tipping deformation balance window 14 connected to the inner hole of the support cylinder 1 is provided on the second cutting section 13. This configuration not only further improves the support stability of the support cylinder 1 and eliminates tilting and tipping, but also achieves a lightweight design for the support cylinder 1.

[0029] Specifically, the support cylinder 1 is square. Two corners on one diagonal of the support cylinder 1 form the support portion 17. Two corners on the other diagonal of the support cylinder 1 are cut to form a first cutting portion 11 and a second cutting portion 13. The first cutting portion 11 and the second cutting portion 13 have the same structure and are symmetrically arranged. The anti-tipping deformation balance window 14 and the nut lever operation window 12 have the same structure and are symmetrically arranged. This arrangement further achieves lightweight design.

[0030] Preferably, the edge distance L1 of the support cylinder 1 should not be too large, just enough to ensure that the contact area with the support surface of the cylinder head 4 meets the allowable surface pressure of the cylinder head 4; at the same time, the length L2 of the nut lever operation window 12 and the anti-tipping deformation balance window 14 is similar to or equal to the length of the support cylinder 1 suspended from the cylinder head, and the distance L4 between the nut lever operation window 12 and the anti-tipping deformation balance window 14 and the end of the support cylinder 1 near the hydraulic tensioning device is 2 to 3 times the minimum wall thickness L3 of the support cylinder 1, so as to ensure the rigidity of the nut lever operation window 12 and the anti-tipping deformation balance window 14 and prevent the window edge stress from being too large and failing.

[0031] In this embodiment, a feeler gauge inspection window 15 is provided at one end of the support cylinder 1 that is supported on the cylinder head 4. The feeler gauge inspection window 15 passes through the first cutting part 11 and the second cutting part 13. By providing the feeler gauge inspection window 15, the fit between the nut 6 and the cylinder head 4 can be checked by the feeler gauge during the tightening process to ensure that the fit between the nut 6 and the cylinder head 4 meets the requirements. When the fit between the nut 6 and the cylinder head 4 meets the requirements, the hydraulic tensioning device can release pressure to ensure that the nut 6 is tightened in place.

[0032] The hydraulic tensioning device in this embodiment includes a tensioning head 2 for threaded connection with the bolt 5, and a hydraulic cylinder 3 for driving the tensioning head 2 to move. A support and positioning structure is provided between the hydraulic cylinder 3 and the support cylinder 1. Conventional hydraulic tensioners are integral structures, which have the disadvantages of being bulky, inconvenient to operate, requiring high manufacturing precision, and being costly. Compared with conventional hydraulic tensioners, this hydraulic tensioning device is smaller in size, easier to operate, saves labor and effort, and greatly improves economic efficiency.

[0033] In this embodiment, the hydraulic cylinder 3 includes an inner cylinder sleeve 31 and an outer cylinder sleeve 32 coaxially sleeved together from the inside to the outside. A sealed hydraulic cavity is formed between the inner cylinder sleeve 31 and the outer cylinder sleeve 32. An oil inlet is provided on the inner cylinder sleeve 31 or the outer cylinder sleeve 32, which is connected to the hydraulic cavity. A pipe joint 33 is connected to the oil inlet. The tension head 2 is T-shaped, and a threaded hole is coaxially provided inside the tension head 2, which is used for threaded connection with the bolt 5. The inner cylinder sleeve 31 has a T-shaped inner hole that is adapted to the tension head 2, and the tension head 2 is slidably disposed in the T-shaped inner hole.

[0034] In this embodiment, the inner cylinder liner 31 includes a first cylindrical segment, a second cylindrical segment, a third cylindrical segment, and a fourth cylindrical segment connected in sequence with increasing diameters. The inner bore of the outer cylinder liner 32 includes a first circular hole segment, a second circular hole segment, and a third circular hole segment connected in sequence with increasing diameters. The first cylindrical segment is slidably disposed within the first circular hole segment, and a first sealing structure 34 is provided between the first cylindrical segment and the second circular hole segment. The third cylindrical segment is slidably disposed within the third circular hole segment, and a second sealing structure 35 is provided between the third circular hole segment and the second cylindrical segment. The inner cylinder liner 31, the outer cylinder liner 32, the first sealing structure 34, and the second sealing structure 35 together form a hydraulic cavity.

[0035] In this embodiment, both the first sealing structure 34 and the second sealing structure 35 use sealing rings. Of course, other sealing structures can also be used, and this embodiment does not impose any restrictions.

[0036] In this embodiment, the oil inlet is located on the fourth cylindrical section, and a hydraulic stroke warning ring 36 is provided on the outer wall of the third cylindrical section. By providing the hydraulic stroke warning ring 36, it is easy to observe the stroke of the hydraulic cylinder 3. When the hydraulic stroke warning ring 36 exceeds the end face of the outer cylinder sleeve 32, the inner cylinder sleeve 31 needs to be reset; otherwise, the first sealing structure 34 will fail to seal.

[0037] In this embodiment, the lower hydraulic engagement stroke H1 of the inner cylinder liner 31 is 1.1 to 1.2 times the effective extension stroke H2 of the inner cylinder liner 31. This setting ensures good sealing of the first sealing structure 34 and the second sealing structure 35 within the effective stroke of the inner cylinder liner 31. The lower hydraulic engagement stroke H1 of the inner cylinder liner 31 must be less than the upper engagement stroke H3 to ensure that in case of misoperation and exceeding the effective stroke, the lower part of the inner cylinder liner 31 will depressurize first (there is a barrier around the lower part for protection), and high-pressure oil will not splash and injure the operator after the upper part depressurizes.

[0038] The support and positioning structure in this embodiment includes a positioning platform 16 coaxially disposed at the end of the support cylinder 1 and a positioning groove 321 coaxially disposed at the end of the outer cylinder sleeve 32. The inner hole of the support cylinder 1 passes through the positioning platform 16, and the positioning groove 321 communicates with the inner hole of the outer cylinder sleeve 32. In use, the hydraulic cylinder 3 is positioned on the positioning platform 16 through the positioning groove 321.

[0039] In this embodiment, the large-diameter section of the stretching head 2 is provided with an internal hexagonal groove 21 that is compatible with the internal hexagonal wrench, and the end of the small-diameter section of the stretching head 2 is provided with a chamfer a.

[0040] In this embodiment, the preferred thread depth H4 of the tension head 2 is 1 to 1.2 times the diameter Mx of the bolt 5 to ensure that the thread strength does not exceed the limit; and the distance T1 between the end face of the tension head 2 and the nut 6 is 2 to 3 times the elongation of the bolt 5 to prevent the end face of the nut 6 from contacting the end face of the tension head 2 when the nut 6 is disassembled. After the pressure is released, the bolt 5 will shrink, and the nut 6 will get stuck with the tension head 2, making it impossible to remove the tension head 2.

[0041] In this embodiment, when installing the bolt assembly disassembly and assembly tool, the distance T2 between the nut 6 and the support cylinder 1 is 1.5 to 2 times the sum of the positioning gaps T3 and T4, in order to prevent the nut 6 from getting stuck in the support cylinder 1 after the hydraulic tensioning device is installed, which would prevent normal disassembly and assembly.

[0042] In this embodiment, the distance T5 between the tension head 2 and the first sealing structure 34 is controlled between 3 and 5 mm, and the chamfer a is controlled between 3° and 6°, so as to ensure that the inward deformation of the hydraulic cylinder 3 after pressing will not result in insufficient tension caused by the tension head 2 and the inner cylinder sleeve 31 jamming, which would lead to incomplete tightening.

[0043] In use, first, the support cylinder 1 is fitted onto the outside of the bolt assembly and the first cutting part 11 is aligned with the edge of the cylinder head 4. Then, the hydraulic cylinder 3 is positioned on the support cylinder 1 and the tensioning head 2 is threadedly connected to the bolt 5. Then, the hydraulic cylinder 3 drives the tensioning head 2 to move, and the tensioning head 2 stretches the bolt 5. When a turning gap is generated between the nut 6 and the cylinder head 4, the nut lever is passed through the nut lever operation window 12 and the nut lever is used to remove and install the nut 6. When assembling the nut 6, this bolt assembly removal and installation tool can ensure that the force on several nuts 6 on the entire cylinder head 4 plane is equal, thus ensuring the integrity and sealing of the equipment.

[0044] The above describes in detail one embodiment of the bolt assembly disassembly and assembly tool of this utility model. Many other embodiments are also described but will not be elaborated upon here. In summary, the bolt assembly disassembly and assembly tool provided by this utility model ensures the smooth disassembly and assembly of bolt assemblies, reduces the difficulty of disassembly and assembly, and improves work efficiency.

[0045] This utility model is not limited to the specific embodiments described above. Any modifications made by those skilled in the art based on the above concept without creative effort shall fall within the protection scope of this utility model.

Claims

1. A bolt assembly disassembly and assembly tool for disassembling and assembling bolt assemblies on a cylinder head, characterized in that, It includes a hydraulic tensioning device and a support cylinder. A first cutting part is provided on one side of the support cylinder, and a nut lever operation window is provided on the first cutting part, which is connected to the inner hole of the support cylinder. The support cylinder is used to be sleeved on the outside of the bolt assembly and supported between the cylinder head and the hydraulic tensioning device. The first cutting part corresponds to the edge of the cylinder head to prevent the support cylinder from being suspended and tilting or overturning. The nut lever operation window corresponds to the nut of the bolt assembly to facilitate tightening the nut. The hydraulic tensioning device is used to be threadedly connected to the bolt of the bolt assembly and to stretch the bolt to create a tightening gap between the nut and the cylinder head.

2. The bolt assembly installation and removal tool according to claim 1, wherein, A second cutting section is provided on the other side of the support cylinder, and an anti-tipping deformation balance window is provided on the second cutting section, which is connected to the inner hole of the support cylinder.

3. The bolt assembly installation and removal tool of claim 2, wherein, The support cylinder is square, and the two corners on one diagonal of the support cylinder form a support part. The two corners on the other diagonal of the support cylinder are cut to form the first cutting part and the second cutting part. The first cutting part and the second cutting part have the same structure. The anti-tipping deformation balance window and the nut lever operation window have the same structure and are arranged symmetrically.

4. The bolt assembly installation and removal tool of claim 3, wherein, The support cylinder is provided with a feeler gauge inspection window at one end of the cylinder head, and the feeler gauge inspection window passes through the first cutting part and the second cutting part.

5. The bolt assembly installation and removal tool as defined in claim 1, wherein, The hydraulic tensioning device includes a tensioning head for threaded connection with the bolt and a hydraulic cylinder for driving the tensioning head to move. A support and positioning structure is provided between the hydraulic cylinder and the support cylinder.

6. The bolt assembly installation and removal tool of claim 5, wherein, The hydraulic cylinder includes an inner cylinder sleeve and an outer cylinder sleeve coaxially sleeved together from the inside out, forming a sealed hydraulic cavity between the inner cylinder sleeve and the outer cylinder sleeve. An oil inlet connected to the hydraulic cavity is provided on the inner cylinder sleeve or the outer cylinder sleeve. The drawing head is T-shaped, and a threaded hole is coaxially provided inside the drawing head. The inner cylinder sleeve has a T-shaped inner hole adapted to the drawing head, and the drawing head is slidably disposed in the T-shaped inner hole.

7. The bolt assembly installation and removal tool of claim 6, wherein, The support and positioning structure includes a positioning platform coaxially disposed at the end of the support cylinder and a positioning groove coaxially disposed at the end of the outer cylinder liner. The inner hole of the support cylinder passes through the positioning platform, and the positioning groove is connected to the inner hole of the outer cylinder liner.

8. The bolt assembly disassembly and assembly tool according to claim 6, characterized in that, The inner cylinder liner includes a first cylindrical segment, a second cylindrical segment, a third cylindrical segment, and a fourth cylindrical segment connected in sequence with increasing diameters. The inner bore of the outer cylinder liner includes a first circular hole segment, a second circular hole segment, and a third circular hole segment connected in sequence with increasing diameters. The first cylindrical segment is slidably disposed within the first circular hole segment, and a first sealing structure is provided between the first cylindrical segment and the second circular hole segment. The third cylindrical segment is slidably disposed within the third circular hole segment, and a second sealing structure is provided between the third circular hole segment and the second cylindrical segment. The inner cylinder liner, the outer cylinder liner, the first sealing structure, and the second sealing structure together form the hydraulic chamber.

9. The bolt assembly installation and removal tool of claim 8, wherein, The oil inlet is arranged on the fourth cylindrical section, and an outer wall of the third cylindrical section is provided with a hydraulic stroke warning ring.

10. The bolt assembly disassembly and assembly tool according to claim 6, characterized in that, A hexagonal socket compatible with a hexagonal wrench is arranged on a large diameter section of the stretching head, and an end of a small diameter section of the stretching head is provided with a chamfer.

Images