A press-fit segmented expansion joint tool for a generator circuit breaker cylinder and its application method

Abstract

This invention provides a press-fit segmented expansion tooling for generator circuit breaker cylinders and its application method, belonging to the technical field of air-insulated switchgear. The technical solution is as follows: a press-fit segmented expansion tooling for generator circuit breaker cylinders includes a cylinder frame with mounting grooves. A pressure block is fixed to the top of the cylinder frame, and at least two sets of vertically arranged limiting mechanisms are provided on the top of the pressure block. The limiting mechanisms are detachably connected to the cylinder frame. The application method involves installing the press-fitted cylinder assembly onto the cylinder frame and controlling the upper pressure head to descend. After descending to a predetermined position, one set of limiting mechanisms is removed to increase the downward pressure. The upper pressure head is then controlled to descend again, and after descending to the predetermined position, another set of limiting mechanisms is removed until the cylinder body contacts the pressure block. The beneficial effect of this invention is that the segmented expansion method effectively avoids cylinder cylinder cracking.

Description

Technical Field

[0001] This invention belongs to the technical field of air-insulated switchgear, specifically relating to a press-fit segmented expansion tool for a generator circuit breaker cylinder and its usage method. Background Technology

[0002] In a generator circuit breaker, the internal cylinder and cylinder barrel need to be press-fitted and fixed by interference fit. Specifically, the cylinder barrel is pressed into the center hole of the cylinder by a press machine and a press-fitting fixture. The friction generated by the elastic deformation of the cylinder barrel material forms a mechanical connection, so that the cylinder barrel is fixed in the center hole of the cylinder and the two do not loosen relative to each other during operation.

[0003] The existing press fitting fixture has a relatively simple structure. As an accessory to the press, the press fitting fixture mainly consists of a base and a press head. During press fitting, the operator needs to manually place the cylinder vertically on the fixture base, then align the cylinder barrel with the cylinder center hole. The press head is then driven by the press to directly act on the top of the cylinder barrel, relying on constant pressure to complete the interference fit.

[0004] However, in practical applications, existing press-fitting fixtures can only press the cylinder barrel into the cylinder's center bore. Because the inner wall of the cylinder's center bore has a conical structure, only a portion of the cylinder barrel's outer wall forms an interference fit with the inner wall of the center bore. Under this assembly condition, the cylinder barrel is at risk of loosening during use. Summary of the Invention

[0005] This invention addresses the problem that existing press-fitting fixtures can only form an interference fit between the outer wall of the cylinder barrel and the inner wall of the center hole, making the cylinder barrel prone to loosening. It provides a press-fitting segmented expansion tool for generator circuit breaker cylinders and its usage method, which can segmentally expand the non-interference fit part of the cylinder barrel, so that the outer wall of the expanded part of the cylinder barrel forms an interference fit with the inner wall of the center hole, making the cylinder barrel less prone to loosening.

[0006] In the first aspect, to solve the above problems, the technical solution adopted by the present invention is as follows: a press-fit segmented expansion tooling for a generator circuit breaker cylinder, including a cylinder frame, a mounting groove provided on the top of the cylinder frame, a detachable conical expansion sleeve provided at the bottom middle position of the mounting groove, the conical expansion sleeve being vertically arranged, a guide sleeve being sleeved on the outside of the conical expansion sleeve, the guide sleeve being fixedly connected to the side wall of the mounting groove, and the axis of the guide sleeve coinciding with the axis of the conical expansion sleeve, a pressure block being fixed on the top of the cylinder frame, at least two sets of vertically arranged limiting mechanisms being provided on the top of the pressure block, the limiting mechanisms being detachably connected to the cylinder frame, a cylinder pressure cap being provided above the limiting mechanisms, and an upper pressure head and a lower pressure head being provided above the cylinder pressure cap.

[0007] In this technical solution, the upper pressure head is fixedly installed on the upper platform of the press, the cylinder frame is fixedly installed on the lower platform of the press, the bottom of the cylinder is inserted into the guide sleeve, the lower part of the cylinder barrel is inserted into the central hole of the cylinder, and the cylinder pressure cap is sleeved on the upper end of the cylinder barrel. During pressing, the press applies pressure to the cylinder pressure cap through the upper pressure head, pressing the cylinder barrel into the central hole of the cylinder, so that the cylinder barrel and the cylinder form an interference fit. During expansion, multiple sets of limiting mechanisms and conical expansion sleeves are installed on the cylinder frame. The upper pressure head applies pressure to the cylinder assembly composed of the cylinder and the cylinder barrel, causing the cylinder assembly to descend in sections. Each time it descends a certain distance, a set of limiting mechanisms is removed until the cylinder body contacts the pressure block, and the conical expansion sleeve then expands the lower part of the cylinder barrel in sections. During depressurization, the depressurization head is placed into the cylinder barrel, and the upper pressure head is controlled to apply pressure to the depressurization head, which in turn applies pressure to the conical expansion sleeve until the conical expansion sleeve separates from the cylinder barrel. Therefore, this tooling can effectively prevent cylinder barrel cracking by using a segmented expansion method.

[0008] Furthermore, a positioning hole is provided at the bottom center of the mounting groove. The axis of the positioning hole coincides with the axis of the guide sleeve. The lower part of the tapered expansion sleeve is inserted into the positioning hole, and a positioning block is fixed in the middle of the tapered expansion sleeve. The positioning block abuts against the bottom of the mounting groove. The upper outer wall of the tapered expansion sleeve is an outer conical surface, and the taper of the outer conical surface is the same as the taper of the inner conical surface of the cylinder center hole. The axis of the positioning hole coincides with the axis of the guide sleeve, so that after the lower part of the tapered expansion sleeve is inserted into the positioning hole, its axis is completely aligned with the axes of the guide sleeve and the cylinder center hole, avoiding tilting or eccentricity of the tapered expansion sleeve, ensuring the verticality of the tapered expansion sleeve and the overall coaxiality accuracy, and providing a basis for uniform force on the cylinder barrel during subsequent expansion. The lower part of the tapered expansion sleeve is inserted into the positioning hole, forming a radial limit, preventing the tapered expansion sleeve from shifting or shaking in the horizontal direction, further enhancing its vertical stability. Especially when subjected to expansion pressure, it can avoid the tapered expansion sleeve from tilting or the cylinder barrel from expanding unevenly due to positional deviation. The positioning block abuts against the bottom of the mounting groove to form an axial positioning surface, which not only limits the insertion depth of the tapered expansion sleeve, but also provides uniform support force through planar contact, preventing the tapered expansion sleeve from tilting or twisting when subjected to axial force, and ensuring that it always maintains a vertical posture perpendicular to the bottom surface of the mounting groove.

[0009] Furthermore, a positioning groove is provided at the top of the cylinder frame, which connects to the mounting groove. The bottom of the pressure block abuts against the bottom of the positioning groove. The height of the pressure block is less than the depth of the positioning groove. A through-hole is provided in the middle of the top of the pressure block, and a removable pad is also provided on the top of the pressure block. The height of the pressure block is less than the depth of the positioning groove, forming a redundant space at the top of the positioning groove, which facilitates the direct insertion of the limiting mechanism into the positioning groove from above, and its cooperation and fixation with the top of the pressure block. The through-hole in the middle of the top of the pressure block penetrates the pressure block, and its diameter is adapted to the size of the bottom of the cylinder, which can serve as a guide channel to guide the bottom of the cylinder into the guide sleeve. During assembly, the bottom of the cylinder first passes through the through-hole, and then the guide sleeve is inserted. The alignment of the hole ensures that the cylinder axis is consistent with the guide sleeve axis, avoiding cylinder tilting or offset, while reducing frictional resistance during insertion and improving assembly smoothness.

[0010] Furthermore, each limiting mechanism includes two semi-circular pads. The cross-section of each semi-circular pad is semi-annular. A stop boss is fixed to the bottom of each semi-circular pad, which can engage with the positioning groove. A stop groove is provided on the top of each semi-circular pad, the shape and size of which are adapted to the stop boss. A limiting groove is also provided on the top of each semi-circular pad, and a detachable limiting plate is installed in the limiting groove. Each limiting mechanism uses two semi-annular pads spliced ​​together to form a complete ring. It does not need to be installed as a whole from the axial direction into the positioning groove; it can be installed simply by closing it radially from both sides, which is especially suitable for scenarios with limited space. Disassembly can be performed by reversing the operation, which greatly improves assembly efficiency and reduces labor intensity. The stop boss at the bottom of the lowest semi-circular pad directly engages with the corresponding groove in the positioning groove. The geometric fit of the convex and concave structure achieves automatic centering without additional measurement or adjustment, ensuring that the axis of the limiting mechanism coincides with the axis of the positioning groove. Meanwhile, the groove wall of the positioning groove constrains the outer sides of the two semi-circular pads, fixing them together as a whole and preventing misalignment of the pads due to uneven force. This simplifies the installation process while improving positioning reliability. The stop protrusion at the bottom of the upper semi-circular pad engages with the stop groove at the top of the lower semi-circular pad, achieving rapid stacking of multiple limiting mechanisms through stepped stacking positioning.

[0011] Furthermore, connecting holes are provided on the outer wall of the cylinder frame and the outer wall of the semi-circular pad, and handles are inserted and fixed into the connecting holes. The handles provide a gripping point for the cylinder frame and the semi-circular pad. Especially when the cylinder frame is large or there are many semi-circular pads, the operator can easily carry and move the parts through the handles, avoiding hand injuries or parts slipping caused by directly gripping the rough outer wall.

[0012] Furthermore, both the upper pressure head and the lower pressure head are cylindrical structures. The diameter of the upper pressure head is larger than the outer diameter of the cylinder, while the diameter of the lower pressure head is smaller than the inner diameter of the cylinder. The cylindrical surface diameter of the upper pressure head is larger than the outer diameter of the cylinder, allowing it to completely cover the top surface of the cylinder. When axial pressure is applied to the cylinder, the large-diameter surface of the upper pressure head can evenly distribute the pressure at the end of the cylinder, avoiding stress concentration caused by a small contact area and ensuring a smooth and reliable pressure application process. The diameter of the lower pressure head is smaller than the inner diameter of the cylinder, allowing it to easily pass through the cylinder and directly apply pressure to the tapered expansion sleeve. The tapered expansion sleeve can be quickly removed by axial pushing.

[0013] Secondly, the present invention also provides a method for using a press-fit segmented expansion joint tooling for a generator circuit breaker cylinder, which includes the following steps:

[0014] Step 1: Fix the upper pressure head on the upper platform of the press, and fix the cylinder frame on the lower platform of the press. Ensure that the axis of the guide sleeve coincides with the axis of the upper pressure head. Then, insert the bottom of the cylinder into the guide sleeve until the cylinder body abuts against the pressure block. Finally, insert the lower part of the cylinder barrel into the center hole of the cylinder until the outer cylindrical surface of the upper part of the cylinder barrel engages with the center hole of the cylinder.

[0015] Step 2: Fit the cylinder cap onto the upper end of the cylinder barrel, control the upper platform of the press to descend, and apply pressure to the cylinder cap to press the cylinder barrel into the center hole of the cylinder.

[0016] Step 3: First, remove the cylinder assembly consisting of the cylinder and cylinder barrel. Install multiple sets of limiting mechanisms and conical expansion sleeves on the cylinder frame. Then, reinstall the cylinder assembly on the cylinder frame and control the upper pressure head to descend. After descending to the predetermined position, remove one set of limiting mechanisms to increase the downward pressure. Control the upper pressure head to descend again. After descending to the predetermined position, remove another set of limiting mechanisms. Repeat the operation until the cylinder body contacts the pressure block.

[0017] Step 4: Remove the cylinder cap, insert the pressure relief head into the cylinder barrel, lift the cylinder assembly and the conical expansion sleeve a certain distance, then raise the pressure block, and then place the cylinder assembly and the conical expansion sleeve back on the cylinder frame. Control the upper pressure head to press down the pressure relief head to apply pressure to the conical expansion sleeve until the conical expansion sleeve separates from the cylinder barrel.

[0018] Furthermore, in step two, before attaching the cylinder head cap to the upper end of the cylinder barrel, silicone grease is applied only to the outer cylindrical surface of the upper part of the cylinder barrel. Silicone grease has excellent lubricity; when applied to the outer cylindrical surface of the upper part of the cylinder barrel, it significantly reduces the coefficient of friction between the cylinder barrel and the inner wall of the cylinder center bore, allowing the pressing force applied by the press to be more effectively converted into propulsive force, avoiding jamming or surface scratches caused by excessive friction. The lower outer cylindrical surface of the cylinder barrel needs to be radially expanded using a tapered expansion sleeve to form an interference fit. If silicone grease is applied to this area, the following problems may occur: Over-lubrication leading to slippage of the tapered expansion sleeve: Silicone grease reduces the friction between the tapered expansion sleeve and the cylinder barrel, preventing the tapered expansion sleeve from effectively transmitting radial force during pressurization, resulting in uneven expansion or dimensional instability; Silicone grease residue affecting fit quality: After expansion, silicone grease may be squeezed into the gaps of the mating surfaces, forming a weak layer, reducing the contact stiffness between the cylinder barrel and the tapered expansion sleeve, affecting sealing performance or structural strength.

[0019] Furthermore, in step three, after installing the conical expansion sleeve on the cylinder frame, silicone grease is applied to the outer wall of the conical expansion sleeve. During the controlled descent of the upper pressure head, when the cylinder body is about to contact the limiting mechanism, the descent of the upper pressure head is stopped, and a set of limiting mechanisms located at the top is removed. After applying silicone grease to the outer surface of the conical expansion sleeve, its coefficient of friction with the inner wall of the cylinder is significantly reduced, so that the pressure relief head only needs a small axial force to push the conical expansion sleeve out during depressurization, avoiding jamming of the conical expansion sleeve or scoring of the inner wall of the cylinder due to "dry friction". This segmented expansion allows the cylinder material to gradually adapt to radial deformation, avoiding the stress mutation caused by a one-time full-section expansion, fundamentally suppressing the risk of cracking, and is especially suitable for brittle materials or thin-walled structures.

[0020] Furthermore, in step four, during the controlled descent of the pressure-reducing head, if the pressure-reducing head deviates from the predetermined position, the descent is stopped, and the position of the cylinder frame is adjusted. When the pressure-reducing head is vertical, its axial thrust is completely aligned with the axis of the conical expansion sleeve, preventing the conical expansion sleeve from tilting or breaking due to lateral forces caused by off-center loading. Especially for conical expansion sleeves made of cemented carbide, vertical unloading allows them to withstand pure axial force, effectively reducing the risk of breakage.

[0021] As can be seen from the above technical solution, the advantages of this invention are as follows: In this technical solution, the upper pressure head is fixedly installed on the upper platform of the press, and the cylinder frame is fixed on the lower platform of the press. The bottom of the cylinder is inserted into the guide sleeve, the lower part of the cylinder barrel is inserted into the central hole of the cylinder, and the cylinder pressure cap is sleeved on the upper end of the cylinder barrel. During the pressing process, the press applies pressure to the cylinder pressure cap through the upper pressure head, pressing the cylinder barrel into the central hole of the cylinder to form an interference fit. During the expansion, multiple sets of limiting mechanisms and conical expansion sleeves are first installed on the cylinder frame. The upper pressure head applies pressure to the assembly composed of the cylinder and the cylinder barrel, causing the cylinder assembly to descend in sections. Each time it descends a certain distance, a set of limiting mechanisms is removed until the cylinder body contacts the pressure block. At this time, the conical expansion sleeve expands the lower part of the cylinder barrel in sections. During the unpressurization, the unpressurization head is placed into the cylinder barrel, and the upper pressure head is controlled to apply pressure to the unpressurization head, thereby applying pressure to the conical expansion sleeve until the conical expansion sleeve separates from the cylinder barrel. In summary, this tooling adopts a segmented expansion method, which effectively avoids the problem of cylinder barrel cracking. Attached Figure Description

[0022] To more clearly illustrate the technical solution of the present invention, the accompanying drawings used in the description will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of a specific embodiment of the present invention;

[0024] Figure 2 This is a front view schematic diagram of a specific embodiment of the present invention;

[0025] Figure 3 for Figure 2 Schematic diagram of the AA section;

[0026] Figure 4 for Figure 3 Enlarged view of a section at point B in the middle;

[0027] Figure 5 This is a schematic diagram of the semi-circular pad block in a specific embodiment of the present invention;

[0028] Figure 6 This is a schematic diagram of the cylinder barrel in a specific embodiment of the present invention;

[0029] Figure 7 This is a schematic diagram of the installation of the pad in a specific embodiment of the present invention.

[0030] In the diagram: 1. Cylinder; 2. Cylinder barrel; 21. Pressure bearing section; 22. Pressing section; 23. Expansion section; 3. Cylinder frame; 31. Mounting groove; 32. Positioning groove; 33. Positioning hole; 34. Connecting hole; 4. Conical expansion sleeve; 41. Positioning block; 42. Outer conical surface; 5. Guide sleeve; 6. Pressure block; 61. Connecting hole; 7. Limiting mechanism; 71. Semi-circular pad; 711. Stop groove; 712. Stop boss; 713. Limiting groove; 72. Handle; 73. Limiting plate; 8. Cylinder cap; 81. Retracting pressure head; 82. Upper pressure head; 9. Pad plate. Detailed Implementation

[0031] To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this patent, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this patent.

[0032] Example 1: A press-fit segmented expansion joint tooling for a generator circuit breaker cylinder, such as... Figure 1-3 As shown, the device includes a cylinder frame 3 with a mounting groove 31 for fixing the cylinder 1. A detachable conical expansion sleeve 4 is located at the bottom center of the mounting groove 31. The conical expansion sleeve 4 is vertically arranged and expands the cylinder 2. A guide sleeve 5 is sleeved on the outside of the conical expansion sleeve 4. The guide sleeve 5 is fixedly connected to the side wall of the mounting groove 31, and the axis of the guide sleeve 5 coincides with the axis of the conical expansion sleeve 4. A pressure block 6 is fixed on the top of the cylinder frame 3. At least two sets of vertically arranged limiting mechanisms 7 are provided on the top of the pressure block 6. The limiting mechanisms 7 are detachably connected to the cylinder frame 3. A cylinder pressure cap 8 is provided above the limiting mechanisms 7. An upper pressure head 82 and a lower pressure head 81 are provided above the cylinder pressure cap 8.

[0033] In this specific embodiment, the cylinder frame 3 adopts the following structure: A mounting groove 31 is provided at the top of the cylinder frame 3. The mounting groove 31 consists of an upper cavity and a lower cavity, both of which are cylindrical and their center lines coincide. The diameter of the upper cavity is larger than the diameter of the lower cavity, forming a stepped surface at their junction. A positioning hole 33 is provided at the bottom center of the mounting groove 31. The positioning hole 33 is a circular hole, and its center line coincides with the center line of the mounting groove 31, providing a positioning reference for the conical expansion sleeve 4. The conical expansion sleeve 4 is installed in the mounting groove 31. The lower part of the conical expansion sleeve 4 is a cylindrical insertion part with the same diameter as the positioning hole 33. The insertion part is fixed in the positioning hole 33 by a tight insertion, thereby achieving radial positioning of the conical expansion sleeve 4. The middle part of the conical expansion sleeve 4 is provided with a positioning block 41 integrally formed with the insertion part. The positioning block 41 is cylindrical, and the bottom surface of the positioning block 41 is in close contact with the bottom of the mounting groove 31, forming an axial limit on the conical expansion sleeve 4 to prevent it from moving up and down during operation. The upper part of the conical expansion sleeve 4 is a conical part, and the outer wall of the conical part is set as an outer conical surface 42. The taper of the outer conical surface 42 is the same as the taper of the inner conical surface of the center hole of the cylinder 1 to ensure the accuracy of the conical surface fit between the cylinder barrel 2 and the conical expansion sleeve 4 when the cylinder is expanded.

[0034] The guide sleeve 5 is located inside the mounting groove 31, and its axis coincides with the axis of the positioning hole 33. The guide sleeve 5 is integrally machined from two parts: a fixing part and a guiding part, with the fixing part located above the guiding part. The fixing part is a ring plate structure, and its lower surface is completely fitted with the stepped surface of the mounting groove 31. The upper surface of the fixing part is provided with four through holes, which are evenly distributed around the axis of the fixing part at equal angles. The stepped surface of the mounting groove 31 is provided with four screw holes, which are respectively opposite to the four through holes. Each of the four through holes is fitted with a bolt, and the head of the bolt passes through the through hole and is threaded into the screw hole, thus achieving reliable fixation of the fixing part of the guide sleeve 5 to the stepped surface of the mounting groove 31. The guide part is a cylindrical structure with its axis coinciding with the axis of the fixing part. The inner wall diameter of the guide part is the same as the inner wall diameter of the fixing part, and the outer wall diameter of the guide part is the same as the side wall diameter of the lower cavity of the mounting groove 31. This allows the outer wall of the guide part to fit tightly with the side wall of the lower cavity, forming a stable support structure and providing guidance for the installation of the cylinder 1.

[0035] The top of the cylinder frame 3 is also provided with a cylindrical positioning groove 32, which communicates with the upper cavity of the mounting groove 31. The side wall diameter of the positioning groove 32 is larger than the side wall diameter of the upper cavity, forming a stepped structure. The pressure block 6 is installed in the positioning groove 32 by snap-fit. The pressure block 6 is cylindrical in shape, and its outer side wall diameter is the same as the side wall diameter of the positioning groove 32, ensuring a tight fit between the two. The bottom surface of the pressure block 6 is flat, which fits and abuts against the bottom of the positioning groove 32, forming a stable support surface. The height of the pressure block 6 is less than the depth of the positioning groove 32, leaving space at the top of the pressure block 6 for installing the limiting mechanism 7. A through hole 61 is opened in the middle of the top of the pressure block 6. The diameter of the through hole 61 is larger than the diameter of the bottom of the cylinder 1, so that the bottom of the cylinder 1 can pass smoothly through the through hole 61 and be inserted into the guide sleeve 5, realizing the positioning and installation of the cylinder 1. Figure 7 As shown, a removable pad 9 is also provided on the top of the pressure block 6. The pad 9 is used in the unpressurization stage and is not used simultaneously with the limiting mechanism 7. In this embodiment, there are two pads 9, which are symmetrically distributed on the top of the pressure block 6. The pad 9 is set as a semi-circular ring. The diameter of the outer wall of the pad 9 is the same as the diameter of the side wall of the positioning groove 32, that is, the outer wall of the pad 9 is in close contact with the side wall of the positioning groove 32, and the bottom of the pad 9 is in close contact with the top of the pressure block.

[0036] like Figure 4 As shown, in this specific embodiment, the limiting mechanism 7 adopts the following structure: there are two sets of limiting mechanisms 7, and each set of limiting mechanisms 7 includes two semi-circular pads 71. The cross-section of the semi-circular pad 71 is semi-annular, and the diameter of its inner sidewall is larger than the diameter of the bottom of the cylinder 1, so as to ensure that the bottom of the cylinder 1 can pass through the semi-circular pad 71 without interference. The bottom of the semi-circular pad 71 is provided with a semi-circular annular stop boss 712. The outer diameter of the stop boss 712 is the same as the side diameter of the positioning groove 32, so that the stop boss 712 can be accurately engaged in the positioning groove 32 to achieve the initial positioning of the limiting mechanism 7. The top of the semi-circular pad 71 is provided with a stop groove 711. The shape and size of the stop groove 711 are perfectly matched with the stop boss 712. Specifically, the side diameter of the stop groove 711 is the same as the outer diameter of the stop boss 712, and the depth of the stop groove 711 is the same as the height of the stop boss 712. This allows the stop boss 712 at the bottom of the upper semi-circular pad 71 to be accurately engaged in the stop groove 711 at the top of the lower semi-circular pad 71, forming a stacked positioning structure. Figure 5As shown, in addition, a limiting groove 713 is provided on the top of the semi-circular pad 71. The depth of the limiting groove 713 is the same as the depth of the stop groove 711. One end of the limiting groove 713 is connected to the stop groove 711, and the other end extends to the outside of the semi-circular pad 71. A detachable limiting plate 73 is provided in the limiting groove 713. The limiting plate 73 is a rectangular flat plate with the same thickness as the depth of the limiting groove 713. The height of the limiting mechanism 7 can be adjusted by inserting the limiting groove 713.

[0037] Both the outer wall of the cylinder frame 3 and the outer wall of the semi-circular pad 71 are provided with connecting holes 34, which are threaded holes. A horizontally arranged handle 72 is provided on the outside of the connecting hole 34. The end of the handle 72 is snapped into one end of the bolt rod, and the other end of the bolt rod is threaded into the connecting hole 34, thereby fixing the handle 72 to the cylinder frame 3 and the semi-circular pad 71, facilitating operation and installation. The upper pressure head 82 and the lower pressure head 81 are both vertically arranged cylindrical structures. The diameter of the upper pressure head 82 is larger than the outer diameter of the cylinder 2. A flange is installed at its upper end, and it is fixed to the upper platform of the press by bolts through the flange, ensuring that the pressure of the press can be evenly transmitted to the upper pressure head 82. The diameter of the lower pressure head 81 is smaller than the inner diameter of the cylinder 2. It is used to apply pressure to the conical expansion sleeve 4 during the depressurization process to separate the conical expansion sleeve 4 from the cylinder 2.

[0038] Example 2: Based on the press-fit segmented expansion tool for generator circuit breaker cylinders provided in Example 1, this example further provides a method for using the press-fit segmented expansion tool for generator circuit breaker cylinders, including the following steps.

[0039] Step one: First, use hex socket head cap screws to fix the upper pressure head 82 onto the upper platform of the press, ensuring that the upper pressure head 82 is in a vertical position. Simultaneously, use the handle 72 to move the cylinder frame 3 to the lower platform of the press, adjust the position of the cylinder frame 3 to ensure that the axis of the guide sleeve 5 inside the cylinder frame 3 coincides with the axis of the upper pressure head 82. After determining the position of the cylinder frame 3, fix the cylinder frame 3 onto the lower platform of the press. Then, use hex socket head cap screws to fix the guide sleeve 5 into the mounting groove 31, and engage the pressure block 6 into the positioning groove 32. Then, place the cylinder 1 into the mounting groove 31, inserting the bottom of the cylinder 1 into the guide sleeve 5 until the body of the cylinder 1 abuts against the pressure block 6. Figure 6 As shown, the cylinder barrel 2 is finally inserted into the center hole of the cylinder 1. At this time, the expansion section 23 of the cylinder barrel 2 is fully inserted into the center hole of the cylinder 1, and the pressing section 22 of the cylinder barrel 2 is engaged at the inlet of the center hole of the cylinder 1.

[0040] Step two: Apply silicone grease only to the outer cylindrical surface of the pressing section 22 of cylinder barrel 2, and do not apply silicone grease to the bearing section 21 and the expansion section 23 of cylinder barrel 2. Then, fit the cylinder cap 8 onto the bearing section 21 of cylinder barrel 2, adjust the press pressure to 1000 daN, control the upper platform of the press to descend, and the upper pressure head 82 begins to apply pressure to the cylinder cap 8. The position of cylinder 1 remains unchanged, and cylinder barrel 2 and cylinder cap 8 begin to descend synchronously. The pressing section 22 of cylinder barrel 2 begins to press into the center hole of cylinder 1. When cylinder barrel 2 and cylinder cap 8 have descended 35mm, control the upper platform of the press to rise and check whether cylinder barrel 2 has been pressed into the predetermined position. If it has not reached the predetermined position, it needs to be pressed again. If it has been pressed into place, wipe off the excess silicone grease with lint-free paper.

[0041] Step 3: First, remove the cylinder assembly consisting of cylinder 1 and cylinder barrel 2. Then, insert the lower part of the conical expansion sleeve 4 into the positioning hole 33 until the positioning block 41 of the conical expansion sleeve 4 abuts against the bottom of the mounting groove 31. Next, apply silicone grease to the outer conical surface 42 of the upper part of the conical expansion sleeve 4. Then, take the two semi-circular pads 71 ​​through the handle 72, assemble them into a complete ring, and place them on top of the pressure block 6. At this time, the stop bosses 712 at the bottom of the two semi-circular pads 71 ​​are also assembled into a complete ring and locked in the positioning groove 32. Then, take two semi-circular pads 71 ​​again using handle 72, assemble them into a complete ring, and place them above the previous two semi-circular pads 71. At this time, the stop protrusions 712 at the bottom of the two upper semi-circular pads 71 ​​are also assembled into a complete ring and locked into the stop grooves 711 at the top of the two lower semi-circular pads 71. Then, install the limiting plate 73 in the limiting groove 713 at the top of the upper semi-circular pad 71, with one end of the limiting plate 73 protruding from the limiting groove 713. Then, reinstall the cylinder assembly on the cylinder frame 3, adjust the press pressure to 2000 daN, and then control the upper platform of the press to descend. The upper pressure head 82 begins to apply pressure to the cylinder assembly, and the cylinder assembly begins to descend as a whole. During the descent of the cylinder assembly, the upper outer conical surface 42 of the conical expansion sleeve 4 begins to insert into the cylinder 2 from the bottom of the cylinder 2 and expands the expansion section 23 of the cylinder 2. When the cylinder 1 body is about to contact the limiting plate 73, stop the descent of the upper platform of the press, then remove the limiting plate 73 and remove the two uppermost semi-circular pads 71. Then install the limiting plate 73 in the limiting groove 713 at the top of the lower semi-circular pad 71. Then the upper platform of the press continues to descend, and the conical expansion sleeve 4 continues to expand the expansion port section 23 of the cylinder barrel 2. When the cylinder 1 body is about to contact the limiting plate 73 again, stop the descent of the upper platform of the press, then remove the limiting plate 73 and remove the remaining two semi-circular pads 71. Adjust the press pressure to 3500 daN, then the upper platform of the press continues to descend, and the conical expansion sleeve 4 continues to expand the expansion port section 23 of the cylinder barrel 2. When the cylinder 1 body contacts the pressure block 6, control the upper platform of the press to rise.

[0042] Step four: First, remove the cylinder cap 8 and place the pressure relief head 81 inside the cylinder barrel 2, ensuring that the pressure relief head 81 is in a vertical position. Then, lift the cylinder assembly and the conical expansion sleeve 4 together a certain distance. Next, insert the two pads 9 into the gap between the cylinder 1 and the pressure block 6. Then, place the cylinder assembly and the conical expansion sleeve 4 back onto the cylinder frame 3. At this time, the main body of the cylinder 1 abuts against the pads 9, and the height of the cylinder assembly and the conical expansion sleeve 4 is higher than before. The positioning block 41 of the conical expansion sleeve 4 separates from the bottom of the mounting groove 31. Control the upper platform of the press to drive the upper pressure head 82 to descend and apply pressure to the pressure relief head 81. At this time, the pressure relief head 81 passes through the cylinder barrel 2 and directly applies pressure to the top of the conical expansion sleeve 4 until the conical expansion sleeve 4 separates from the cylinder barrel 2. Remove the cylinder assembly consisting of the cylinder 1 and the cylinder barrel 2, and wipe off the silicone grease with clean, lint-free paper.

[0043] As can be seen from the above embodiments, the beneficial effects of the present invention are as follows: In this specific embodiment, the upper pressure head is fixedly installed on the upper platform of the press, and the cylinder frame is fixed on the lower platform of the press. The bottom of the cylinder is inserted into the guide sleeve, the lower part of the cylinder barrel is inserted into the central hole of the cylinder, and the cylinder pressure cap is sleeved on the upper end of the cylinder barrel. During the pressing process, the press applies pressure to the cylinder pressure cap through the upper pressure head, pressing the cylinder barrel into the central hole of the cylinder to form an interference fit. During the expansion, multiple sets of limiting mechanisms and conical expansion sleeves are first installed on the cylinder frame. The upper pressure head applies pressure to the assembly composed of the cylinder and the cylinder barrel, causing the cylinder assembly to descend in sections. Each time it descends a certain distance, a set of limiting mechanisms is removed until the cylinder body contacts the pressure block. At this time, the conical expansion sleeve expands the lower part of the cylinder barrel in sections. During the unpressurization, the unpressurization head is placed into the cylinder barrel, and the upper pressure head is controlled to apply pressure to the unpressurization head, thereby applying pressure to the conical expansion sleeve until the conical expansion sleeve separates from the cylinder barrel. In summary, this tooling adopts a segmented expansion method, which effectively avoids the problem of cylinder barrel cracking.

[0044] The above description of the disclosed embodiments enables those skilled in the art to make or use the 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 invention. Therefore, the 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 method for using a press-fit segmented expansion joint tool for a generator circuit breaker cylinder, characterized in that, This invention relates to a press-fit segmented expansion joint tooling for a generator circuit breaker cylinder. The tooling includes a cylinder frame (3), with a mounting groove (31) on the top of the cylinder frame (3). The tooling is characterized by a detachable conical expansion sleeve (4) located at the bottom center of the mounting groove (31). The conical expansion sleeve (4) is vertically arranged, and a guide sleeve (5) is fitted around the outside of the conical expansion sleeve (4). The guide sleeve (5) is fixedly connected to the side wall of the mounting groove (31), and the axis of the guide sleeve (5) coincides with the axis of the conical expansion sleeve (4). A pressure block (6) is fixed to the top of the cylinder frame (3), and at least two sets of vertically arranged limiting mechanisms (7) are provided on the top of the pressure block (6). The limiting mechanisms (7) are detachably connected to the cylinder frame (3). A cylinder pressure cap (8) is provided above the limiting mechanisms (7), and an upper pressure head (82) and a lower pressure head (81) are provided above the cylinder pressure cap (8). The method includes the following steps. Step 1: Fix the upper pressure head (82) on the upper platform of the press, and fix the cylinder frame (3) on the lower platform of the press. Ensure that the axis of the guide sleeve (5) coincides with the axis of the upper pressure head (82). Then insert the bottom of the cylinder (1) into the guide sleeve (5) until the cylinder body (1) abuts against the pressure block (6). Finally, insert the lower part of the cylinder barrel (2) into the center hole of the cylinder (1) until the outer cylindrical surface of the upper part of the cylinder barrel (2) engages with the center hole of the cylinder (1). Step 2: Fit the cylinder cap (8) onto the upper end of the cylinder barrel (2), control the upper platform of the press to descend, and apply pressure to the cylinder cap (8) to press the cylinder barrel (2) into the center hole of the cylinder (1). Step 3: First, remove the cylinder assembly consisting of cylinder (1) and cylinder barrel (2), install multiple sets of limiting mechanisms (7) and conical expansion sleeve (4) on the cylinder frame (3), then reinstall the cylinder assembly on the cylinder frame (3), and control the upper pressure head (82) to descend. After descending to the predetermined position, remove one set of limiting mechanisms (7), increase the downward pressure, control the upper pressure head (82) to descend again, and after descending to the predetermined position, remove another set of limiting mechanisms (7). Repeat the operation until the main body of cylinder (1) contacts the pressure block (6). Step 4: Remove the cylinder cap (8), place the pressure relief head (81) into the cylinder barrel (2), lift the cylinder assembly and the conical expansion sleeve (4) a certain distance, then raise the pressure block (6), and then place the cylinder assembly and the conical expansion sleeve (4) back on the cylinder frame (3), control the upper pressure head (82) to press down the pressure relief head (81), apply pressure to the conical expansion sleeve (4) until the conical expansion sleeve (4) separates from the cylinder barrel (2).

2. The method of using a press fit segment bell mouth tooling for a generator circuit breaker gas cylinder as described in claim 1, wherein, A positioning hole (33) is provided at the bottom center of the mounting groove (31). The axis of the positioning hole (33) coincides with the axis of the guide sleeve (5). The lower part of the tapered expansion sleeve (4) is inserted into the positioning hole (33). A positioning block (41) is fixed in the middle of the tapered expansion sleeve (4). The positioning block (41) abuts against the bottom of the mounting groove (31). The upper outer wall of the tapered expansion sleeve (4) is an outer tapered surface (42). The taper of the outer tapered surface (42) is the same as the taper of the inner tapered surface of the center hole of the cylinder (1).

3. The method of using a press fit segment bell mouth tooling for a generator circuit breaker gas cylinder as described in claim 1, wherein, The top of the tube frame (3) is also provided with a positioning groove (32), which is connected to the mounting groove (31). The bottom of the pressure block (6) abuts against the bottom of the positioning groove (32). The height of the pressure block (6) is less than the depth of the positioning groove (32). A through hole (61) is provided in the middle of the top of the pressure block (6). A removable pad (9) is also provided on the top of the pressure block (6).

4. The method of using a press fit segment bell mouth tooling for a generator circuit breaker gas cylinder as described in claim 3, wherein, Each set of limiting mechanisms (7) includes two semi-circular pads (71). The cross-section of the semi-circular pads (71) is semi-circular. The bottom of the semi-circular pads (71) is fixed with a stop boss (712). The stop boss (712) can be engaged in the positioning groove (32). The top of the semi-circular pads (71) is provided with a stop groove (711). The shape and size of the stop groove (711) are adapted to the stop boss (712). The top of the semi-circular pads (71) is also provided with a limiting groove (713). A detachable limiting plate (73) is provided in the limiting groove (713).

5. The method of using the press-fit segmented expansion joint tool for generator circuit breaker cylinders according to claim 4, characterized in that, Connection holes (34) are provided on the outer wall of the tube frame (3) and the outer wall of the semi-circular pad (71), and handles (72) are inserted and fixed in the connection holes (34).

6. The method of using a press fit segment bellmouth tooling for a generator circuit breaker gas cylinder as described in claim 1, wherein, Both the upper pressure head (82) and the lower pressure head (81) are cylindrical structures. The diameter of the upper pressure head (82) is larger than the outer diameter of the cylinder barrel (2), and the diameter of the lower pressure head (81) is smaller than the inner diameter of the cylinder barrel (2).

7. The method of using a press fit segment bell mouth tooling for a generator circuit breaker gas cylinder as described in claim 1, wherein, In step two, before attaching the cylinder cap (8) to the upper end of the cylinder barrel (2), silicone grease is applied only to the outer cylindrical surface of the upper part of the cylinder barrel (2).

8. The method of using a press fit segment bell mouth tooling for a generator circuit breaker gas cylinder as described in claim 1, wherein, In step three, after the conical expansion sleeve (4) is installed on the cylinder frame (3), silicone grease is applied to the outer wall of the conical expansion sleeve (4). During the process of controlling the descent of the upper pressure head (82), when the main body of the cylinder (1) is about to contact the limiting mechanism (7), the descent of the upper pressure head (82) is stopped, and a set of the uppermost limiting mechanisms (7) is removed.

9. The method of using a press fit segment bell mouth tooling for a generator circuit breaker gas cylinder as described in claim 1, wherein, In step four, if the pressure-reducing head (81) deviates from the predetermined position during the controlled descent of the pressure-reducing head (81), the descent of the pressure-reducing head (81) is stopped, and the position of the cylinder frame (3) is adjusted.

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