Reaming device for large-diameter variable-cross-section cylinder

Abstract

The utility model discloses a reaming device for a large-diameter variable-cross-section cylinder, and belongs to the technical field of forging forming of cylinder forgings. The technical problem that in the prior art, in the reaming process of a large-diameter variable-cross-section cylinder, deformation of the two ends is not synchronous, and consequently the forming precision of finished products is poor is solved. The reaming device for the large-diameter variable-cross-section cylinder comprises a height-adjustable mandrel supporter, a height-fixed mandrel supporter and a mandrel, the adjustable-height mandrel supporter and the fixed-height mandrel supporter are respectively positioned on two sides of the large-diameter variable-cross-section cylinder; the saddle penetrates through the large-diameter variable-cross-section cylinder, and the two ends of the saddle are fixed to the top of the height-adjustable mandrel supporter and the top of the height-fixed mandrel supporter respectively; by dynamically adjusting the height of the height-adjustable mandrel supporter in real time, the height difference between the height-adjustable mandrel supporter and the height-fixed mandrel supporter can be dynamically adjusted in real time. According to the utility model, accurate reaming forming of the large-diameter variable-cross-section cylinder can be realized, and deformation at two ends can be synchronously carried out in the reaming process.

Description

Technical Field

[0001] The utility model relates to the technical field of forging and forming of cylindrical forgings, in particular to a hole expanding device for a large-diameter variable-section cylinder. Background Technique

[0002] The pressure vessel is the only core equipment that cannot be replaced during the whole life cycle in the reactor, and safety and reliability are of crucial importance. Considering the safety of nuclear power operation, current nuclear power equipment has gradually moved towards the direction of integrated design. After integrating the nozzle and the nozzle section cylinder, it poses greater challenges to engineering manufacturing. Currently, the mainstream manufacturing process is to prefabricate large-diameter variable-section cylinder forgings with side nozzle seats, and then layout and extrude the nozzles.

[0003] Currently, the mainstream manufacturing method for large-diameter variable-section cylinders is to use a fixed-height bolster and a stepped hammer head for hole expanding and forming. The height of the bolster cannot be adjusted in real time and dynamically. Generally, when the hole expanding is close to the final size, according to the inner diameter sizes at both ends of the cylinder, the overall height of the bolster at the end with a smaller diameter is selected to be raised. Using this method, the operation is cumbersome. It is necessary to stop forging, lift the mandrel and the blank off the bolster, then lift the bolster as a whole and place pads underneath, and finally lift the mandrel and the blank back onto the bolster to continue hole expanding and forming. Since this method cannot adjust the height of the bolster in real time and dynamically, it can only control the deformation degree at both ends to a certain extent and cannot fundamentally solve the problem of asynchronous deformation at both ends. There is a certain difference in the inner diameters at both ends of the final finished forging, and a large forging allowance is used to cover to meet the final size requirements. Using the existing method not only has low material utilization rate, poor dimensional accuracy, uneven allowances at various parts, but also has problems of high manufacturing cost and long processing cycle. Summary of the Utility Model

[0004] In view of the above analysis, the utility model aims to provide a hole expanding device for a large-diameter variable-section cylinder to solve the problem of asynchronous deformation at both ends during the hole expanding process of the variable-section cylinder in the prior art.

[0005] The purpose of the utility model is mainly achieved through the following technical solutions:

[0006] The utility model provides a hole expanding device for a large-diameter variable-section cylinder, which includes an adjustable-height bolster, a fixed-height bolster, a mandrel, and a multi-step hole expanding hammer head;

[0007] The adjustable-height bolster and the fixed-height bolster are respectively located on both sides of the large-diameter variable-section cylinder; after the mandrel penetrates through the large-diameter variable-section cylinder, its two ends are respectively fixed on the tops of the adjustable-height bolster and the fixed-height bolster, and the multi-step hole expanding hammer head is used for hole expanding the large-diameter variable-section cylinder;

[0008] By dynamically adjusting the height of the adjustable-height sawhorse in real time, the height difference between the adjustable-height sawhorse and the fixed-height sawhorse can be dynamically adjusted in real time.

[0009] In a possible design, the adjustable-height sawhorse includes an upper sawhorse part, a lower sawhorse part, a sawhorse height adjustment device, and a support component;

[0010] The sawhorse height adjustment device is arranged between the upper sawhorse part and the lower sawhorse part; the sawhorse height adjustment device can lift the upper sawhorse part. After the upper sawhorse part is lifted, the support component is placed in the gap between the upper sawhorse part and the lower sawhorse part, and then the upper sawhorse part is lowered onto the support component;

[0011] Through the sawhorse height adjustment device and the support component, the height difference between the adjustable-height sawhorse and the fixed-height sawhorse can be dynamically adjusted in real time.

[0012] In a possible design, a first concave cavity is provided on the bottom end surface of the upper sawhorse part, and a second concave cavity is provided on the top end surface of the lower sawhorse part. The positions of the first concave cavity and the second concave cavity correspond to each other and have the same shape;

[0013] The first concave cavity and the second concave cavity together form the accommodation cavity of the sawhorse height adjustment device.

[0014] In a possible design, the sawhorse height adjustment device is a hydraulic cylinder; the hydraulic cylinder includes a hydraulic cylinder base and a hydraulic cylinder piston;

[0015] The hydraulic cylinder piston is fixedly connected to the hydraulic cylinder base. The hydraulic cylinder piston is arranged in the first concave cavity, and the hydraulic cylinder base is arranged in the second concave cavity. The hydraulic cylinder piston is connected to the upper sawhorse part, and the hydraulic cylinder piston can lift the upper sawhorse part and can make the upper sawhorse part fall back onto the support component.

[0016] In a possible design, the upper sawhorse part is provided with a first upper positioning guide post hole and a second upper positioning guide post hole that are parallel to each other; the lower sawhorse part is provided with a first lower positioning guide post hole and a second lower positioning guide post hole that are parallel to each other;

[0017] The first upper positioning guide post hole corresponds to and communicates with the first lower positioning guide post hole, and the two together form a first positioning guide post hole. A first positioning guide post is arranged in the first positioning guide post hole; the second upper positioning guide post hole corresponds to and communicates with the second lower positioning guide post hole, and the two together form a second positioning guide post hole. A second positioning guide post is arranged in the second positioning guide post hole.

[0018] In a possible design, the support component includes a first positioning stop block and a second positioning stop block with the same structure;

[0019] Both the first positioning stop block and the second positioning stop block are rectangular positioning stop blocks.

[0020] In a possible design, a first guide post cavity is provided on the first positioning stop block, and a second guide post cavity is provided on the second positioning stop block;

[0021] After using the hydraulic cylinder piston to jack up the upper part of the horse frame, a certain gap is formed between the upper part of the horse frame and the lower part of the horse frame. The first positioning stop block can be stuck on the first positioning guide post through the first guide post cavity, and the second positioning stop block can be stuck on the second positioning guide post through the second guide post cavity. Then, the hydraulic cylinder piston falls back onto the first positioning stop block and the second positioning stop block.

[0022] In a possible design, the relationship between the sum of the height H32 of the lower part of the horse frame and the height H31 of the upper part of the horse frame and the height H40 of the fixed-height horse frame is:

[0023] 100mm ≤ H40 - (H32 + H31) ≤ 150mm.

[0024] In a possible design, the above reaming device further includes a transmission mechanism;

[0025] The transmission mechanism is fixedly connected to one end of the horse bar, and the transmission mechanism can drive the horse bar to rotate unidirectionally and then drive the large-diameter variable cross-section cylinder to rotate unidirectionally.

[0026] In a possible design, the above reaming device further includes a hydraulic press;

[0027] The hydraulic press is provided with a movable crossbeam, and the multi-step reaming hammer head is arranged on the movable crossbeam and can move up and down with the movable crossbeam to apply pressure to the large-diameter variable cross-section cylinder for reaming.

[0028] Compared with the prior art, the present utility model can at least achieve one of the following beneficial effects:

[0029] (1) The present utility model can, according to the change of the inner diameters at both ends during the reaming process of the cylinder, correct the problem of asynchronous deformation at both ends by dynamically adjusting the height difference between the two side horse frames in real time through the adjustable-height horse frame, and can effectively solve the problem of asynchronous deformation at both ends during the reaming process of the large-diameter variable cross-section cylinder, realizing precise reaming and forming of the variable cross-section cylinder.

[0030] (2) By arranging a horse frame height adjustment device and a support component between the upper part and the lower part of the horse frame, the present utility model can dynamically adjust the height difference between the adjustable-height horse frame and the fixed-height horse frame in real time, ensuring synchronous deformation at both ends of the multi-step cylinder blank, and thus obtaining finished forgings with high precision.

[0031] In the present utility model, the above-mentioned technical solutions can also be combined with each other to achieve more preferred combined solutions. Other features and advantages of the present utility model will be described in the subsequent description, and some advantages can be made obvious from the description, or can be understood by implementing the present utility model. The objectives and other advantages of the present utility model can be achieved and obtained from the content specifically pointed out in the embodiments of the description and the drawings. Description of the Drawings

[0032] The drawings are only for the purpose of showing specific embodiments, and are not considered as a limitation to the present utility model. Throughout the drawings, the same reference signs denote the same components.

[0033] Figure 1 Schematic assembly structure diagram of the adjustable-height sawhorse of the present utility model;

[0034] Figure 2 Side view of the assembly structure of the adjustable-height sawhorse of the present utility model;

[0035] Figure 3 Schematic structure diagram of the lower part of the sawhorse of the adjustable-height sawhorse of the present utility model;

[0036] Figure 4 Side view of the lower part of the sawhorse of the adjustable-height sawhorse of the present utility model;

[0037] Figure 5 Schematic structure diagram of the upper part of the sawhorse of the adjustable-height sawhorse of the present utility model;

[0038] Figure 6 Side view of the upper part of the sawhorse of the adjustable-height sawhorse of the present utility model;

[0039] Figure 7 Schematic structure diagram of the first positioning stop block of the present utility model;

[0040] Figure 8 Schematic structure diagram of the fixed-height sawhorse of the present utility model;

[0041] Figure 9 Side view of the fixed-height sawhorse of the present utility model;

[0042] Figure 10 Schematic structure diagram of the multi-step cylindrical billet of the present utility model;

[0043] Figure 11 Schematic diagram of the finished forging of the present utility model;

[0044] Figure 12 Schematic diagram of the initial state of the hole expanding device of the present utility model before hole expanding;

[0045] Figure 13Schematic diagram of the hole expanding process on one side of the adjustable-height horse frame of the present utility model being higher than that on one side of the fixed-height horse frame;

[0046] Figure 14 Schematic diagram of the hole expanding process on one side of the hydraulically adjustable-height horse frame being lower than that on one side of the fixed-height horse frame;

[0047] Figure 15 Schematic diagram of the last lap of hole expansion;

[0048] Figure 16 Finished forging drawing of Embodiment 1 of the present utility model;

[0049] Figure 17 Schematic diagram of the prefabricated cylinder structure of Embodiment 1 of the present utility model;

[0050] Figure 18 Schematic diagram before the first lap of hole expansion of Embodiment 1 of the present utility model;

[0051] Figure 19 Schematic diagram after the first lap of hole expansion of Embodiment 1 of the present utility model;

[0052] Figure 20 Dimension drawing of the prefabricated cylinder before the first lap of hole expansion of Embodiment 1 of the present utility model;

[0053] Figure 21 Dimension drawing of the prefabricated cylinder after the first lap of hole expansion of Embodiment 1 of the present utility model;

[0054] Figure 22 Schematic diagram before the second lap of hole expansion of Embodiment 1 of the present utility model;

[0055] Figure 23 Schematic diagram after the second lap of hole expansion of Embodiment 1 of the present utility model;

[0056] Figure 24 Dimension drawing of the prefabricated cylinder before the second lap of hole expansion of Embodiment 1 of the present utility model;

[0057] Figure 25 Dimension drawing of the prefabricated cylinder after the second lap of hole expansion of Embodiment 1 of the present utility model;

[0058] Figure 26 Schematic diagram before the third lap of hole expansion of Embodiment 1 of the present utility model;

[0059] Figure 27 Schematic diagram after the third lap of hole expansion of Embodiment 1 of the present utility model;

[0060] Figure 28 Dimension drawing of the prefabricated cylinder before the third lap of hole expansion of Embodiment 1 of the present utility model;

[0061] Figure 29Dimension drawing of the prefabricated cylinder body after the third ring reaming in Embodiment 1 of the present utility model;

[0062] Figure 30 Schematic diagram before the fourth ring reaming in Embodiment 1 of the present utility model;

[0063] Figure 31 Schematic diagram after the fourth ring reaming in Embodiment 1 of the present utility model;

[0064] Figure 32 Dimension drawing of the prefabricated cylinder body before the fourth ring reaming in Embodiment 1 of the present utility model;

[0065] Figure 33 Dimension drawing of the prefabricated cylinder body after the fourth ring reaming in Embodiment 1 of the present utility model;

[0066] Figure 34 Schematic diagram before the fifth ring reaming in Embodiment 1 of the present utility model;

[0067] Figure 35 Schematic diagram after the fifth ring reaming in Embodiment 1 of the present utility model;

[0068] Figure 36 Dimension drawing of the prefabricated cylinder body before the fifth ring reaming in Embodiment 1 of the present utility model;

[0069] Figure 37 Dimension drawing of the prefabricated cylinder body after the fifth ring reaming in Embodiment 1 of the present utility model.

[0070] Reference numerals:

[0071] 300 - adjustable height trestle; 310 - upper part of the trestle; 320 - first positioning guide post; 330 - first positioning stop block; 340 - hydraulic cylinder; 350 - lower part of the trestle; 311 - first upper positioning guide post hole; 312 - first concave cavity; 351 - first lower positioning guide post hole; 352 - second concave cavity; 341 - hydraulic cylinder piston; 342 - hydraulic cylinder base; 400 - fixed height trestle; 5 - multi - step reaming hammer head; 6 - trestle bar.

[0072] D10 - inner diameter of the prefabricated cylinder body; D11 - outer diameter of the first cross - section of the prefabricated cylinder body; D12 - outer diameter of the second cross - section of the prefabricated cylinder body; D13 - outer diameter of the third cross - section of the prefabricated cylinder body; D20 - inner diameter of the finished cylinder body; D21 - outer diameter of the first cross - section of the finished cylinder body; D22 - outer diameter of the second cross - section of the finished cylinder body; D23 - outer diameter of the third cross - section of the finished cylinder body; H31 - height of the upper part of the adjustable height trestle; H32 - height of the lower part of the adjustable height trestle; H40 - height of the fixed height trestle. Detailed implementation manners

[0073] The preferred embodiments of the present invention will be specifically described below in conjunction with the accompanying drawings. The accompanying drawings form a part of the present invention and are used together with the embodiments of the present invention to explain the principles of the present invention, rather than to limit the scope of the present invention.

[0074] The present invention provides a reaming device for a large-diameter variable-section cylinder body, as Figures 1 to 15 shown. The reaming device for the large-diameter variable-section cylinder body includes an adjustable-height horse frame 300, a fixed-height horse frame 400, a horse bar 6, and a multi-step reaming hammer head 5. The adjustable-height horse frame 300 and the fixed-height horse frame 400 are respectively located on both sides of the large-diameter variable-section cylinder body. The horse bar 6 passes through the large-diameter variable-section cylinder body and is used for reaming the variable-section cylinder body. The two ends of the horse bar 6 are respectively fixed to the tops of the adjustable-height horse frame 300 and the fixed-height horse frame 400. By dynamically adjusting the height of the adjustable-height horse frame 300 in real time, the height difference between the adjustable-height horse frame 300 and the fixed-height horse frame 400 can be dynamically adjusted in real time.

[0075] Specifically, the reaming object of the present invention is a multi-step cylinder blank, that is, the outer circle of the cylinder blank has multiple steps. The multi-step cylinder blank includes a prefabricated cylinder first section, a prefabricated cylinder second section, and a prefabricated cylinder third section. Among them, the outer diameters of the prefabricated cylinder first section and the prefabricated cylinder third section are both smaller than the outer diameter of the prefabricated cylinder second section, the outer diameter of the prefabricated cylinder first section is larger than the outer diameter of the prefabricated cylinder third section, and the inner diameters of the prefabricated cylinder first section, the prefabricated cylinder second section, and the prefabricated cylinder third section are equal. The above multi-step reaming hammer head 5 conforms to the shape of the multi-step cylinder blank. Define the end where the prefabricated cylinder first section is located as the large end, and the end where the prefabricated cylinder third section is located as the small end. The adjustable-height horse frame 300 can be arranged at the large end of the multi-step cylinder blank or at the small end of the adjustable-height horse frame 300. The present invention takes the adjustable-height horse frame 300 arranged on the large-end side of the multi-step cylinder blank as an example. Correspondingly, the fixed-height horse frame 400 is arranged on the small-end side of the multi-step cylinder blank.

[0076] It should be noted that the horse bar 6 of the present invention is in the shape of a long cylinder. Semi-circular horse frame fixing grooves are provided at the tops of the adjustable-height horse frame 300 and the fixed-height horse frame 400, and the radius of the horse frame fixing groove is equal to the radius of the horse bar 6, so that the two ends of the horse bar 6 are respectively embedded in different horse frame fixing grooves.

[0077] When using the reaming device of the present utility model to ream a multi-step cylindrical blank, the mandrel 6 is passed through the hollow part of the multi-step cylindrical blank, and both ends of the mandrel 6 are embedded in the mandrel fixing grooves. During the reaming process, the mandrel 6 can drive the multi-step cylindrical blank to rotate in one direction at any time. Similarly, taking the adjustable-height mandrel support 300 arranged at the large end of the multi-step cylindrical blank as an example, when reaming the first circle, adjust the height of the adjustable-height mandrel support 300 to ensure that it is the same as the height of the fixed-height mandrel support 400, and use the multi-step reaming hammer head to apply pressure to the multi-step cylindrical blank for reaming. After the first circle of reaming is completed, since the outer diameter of the first cross-section of the prefabricated cylinder is larger than the outer diameter of the third cross-section of the prefabricated cylinder, according to the principle that the cross-sectional area remains unchanged before and after reaming, after the first circle of reaming is completed, the inner diameter of the large end of the multi-step cylindrical blank is smaller than the inner diameter of its small end. At this time, adjust the height of the adjustable-height mandrel support 300 so that its height is greater than that of the fixed-height mandrel support 400, and then start the second circle of reaming. Use the multi-step reaming hammer head to apply pressure to the multi-step cylindrical blank for reaming. During the reaming process, the mandrel 6 can drive the multi-step cylindrical blank to rotate unidirectionally. After one circle of reaming is completed, the inner diameter of the large end of the multi-step cylindrical blank is larger than the inner diameter of the small end. At this time, adjust the height of the adjustable-height mandrel support 300 so that its height is smaller than that of the fixed-height mandrel support 400, and then start the third circle of reaming. Ream in this way repeatedly until the size of the multi-step cylindrical blank meets the manufacturing requirements, and then stop the reaming operation.

[0078] It should be noted that during the above reaming process, when the inner diameter of the large end is larger than the inner diameter of the small end, adjust the height of the adjustable-height mandrel support 300 so that it is smaller than the height of the fixed-height mandrel support 400, and then start reaming; when one circle of reaming is completed, when the inner diameter of the large end is smaller than the inner diameter of the small end, adjust the height of the adjustable-height mandrel support 300 so that it is larger than the height of the fixed-height mandrel support 400, and then start reaming until the cylindrical blank meets the manufacturing requirements.

[0079] In the prior art, a fixed-height mandrel support 400 and a hammer head are used for reaming and forming. During the reaming process of the cylindrical blank, the height of the mandrel support cannot be adjusted in real time and dynamically. Generally, when reaming is close to the final size, according to the inner diameter dimensions at both ends of the cylinder, choose to raise the entire mandrel support at the end with a smaller diameter. This method is cumbersome to operate and requires stopping forging, lifting the mandrel 6 and the blank off the mandrel support, then lifting the entire mandrel support and placing a cushion block below, and finally lifting the mandrel 6 and the blank back onto the mandrel support to continue reaming and forming. Since this method cannot adjust the height of the mandrel support in real time and dynamically, it cannot fundamentally solve the problem of asynchronous deformation at both ends.

[0080] Compared with the prior art, the utility model solves the problem that the deformation of both ends of a multi-step cylindrical billet is asynchronous by setting the adjustable-height horse frame 300 and adjusting the height difference between the adjustable-height horse frame 300 and the fixed-height horse frame 400 in real time. Therefore, the utility model can fundamentally solve the problem of asynchronous deformation at both ends of the multi-step cylindrical billet, ensure that the inner diameter dimensions at both ends of the finished forging are consistent, and there is no need to cover with a large forging allowance to meet the final dimension requirements. Therefore, the material utilization rate of the hole expanding device adopting the utility model is high, the dimensional accuracy is high, and the manufacturing cost is low. Moreover, since there is no need to remove the horse bar 6 and the multi-step cylindrical billet from the horse frame, the processing cycle is short and the hole expanding efficiency is high.

[0081] To achieve real-time dynamic adjustment of the height of the horse frame, as Figures 1 to 6 shown, the adjustable-height horse frame 300 of the utility model includes an upper horse frame 310, a lower horse frame 350, a horse frame height adjustment device, and a support member. The horse frame height adjustment device is arranged between the upper horse frame 310 and the lower horse frame 350. The horse frame height adjustment device can jack up the upper horse frame 310. After the upper horse frame 310 is jacked up, the support member is placed in the gap between the upper horse frame 310 and the lower horse frame 350, and then the upper horse frame 310 is lowered onto the support member. The height difference between the adjustable-height horse frame 300 and the fixed-height horse frame 400 can be adjusted in real time through the horse frame height adjustment device and the support member.

[0082] Specifically, the adjustable-height horse frame 300 includes an upper horse frame 310 and a lower horse frame 350. Among them, the upper horse frame 310 is arranged directly above the lower horse frame 350. The horse frame height adjustment device is arranged on the top surface of the lower horse frame 350 and is stably supported by the lower horse frame 350. The top of the horse frame height adjustment device is in contact with the bottom end of the upper horse frame 310. The upper horse frame 310 can be jacked up or lowered through the horse frame height adjustment device. When it is necessary to increase the height of the adjustable-height horse frame 300, that is, to adjust the height of the adjustable-height horse frame 300 to be greater than the height of the fixed horse frame, first use the horse frame height adjustment device to jack up the upper horse frame 310, then place the support member in the gap between the upper horse frame 310 and the lower horse frame 350, and finally use the horse frame height adjustment device to lower the upper horse frame 310 onto the support member. At this time, the height of the adjustable-height horse frame 300 is greater than the height of the fixed horse frame. When it is necessary to decrease the height of the adjustable-height horse frame 300, that is, to adjust the height of the adjustable-height horse frame 300 to be less than the height of the fixed-height horse frame 400, first use the horse frame height adjustment device to jack up the upper horse frame 310, then directly remove the support member or replace it with a support member with a smaller thickness in the gap between the upper horse frame 310 and the lower horse frame 350, and finally use the horse frame height adjustment device to lower the upper horse frame 310 onto the top surface of the lower horse frame 350 or the support member with a smaller thickness. At this time, the height of the adjustable-height horse frame 300 is less than the height of the fixed horse frame.

[0083] Compared with the prior art, the utility model realizes the real-time dynamic adjustment of the height difference between the adjustable-height horse frame 300 and the fixed-height horse frame 400 through the horse frame height adjustment device and the support member, ensuring the synchronous deformation at both ends of the multi-step cylindrical billet, so as to obtain finished forgings with high precision.

[0084] To better fix the horse frame height adjustment device, as Figure 3 and Figure 6 shown, a first concave cavity 312 is provided on the bottom end surface of the upper part 310 of the horse frame of the utility model, and a second concave cavity 352 is provided on the top end surface of the lower part 350 of the horse frame. The positions of the first concave cavity 312 and the second concave cavity 352 correspond to each other and have the same shape; the first concave cavity 312 and the second concave cavity 352 together form a receiving cavity for the horse frame height adjustment device.

[0085] Specifically, a first concave cavity 312 is provided at the bottom end of the upper part 310 of the horse frame, and a second concave cavity 352 is provided at the top end of the lower part 350 of the horse frame. The shapes of the first concave cavity 312 and the second concave cavity 352 are both cylindrical and their apertures are the same. The horse frame height adjustment device is placed in the receiving cavity formed by the two.

[0086] Compared with the prior art, the utility model places the horse frame height adjustment device in its receiving cavity, which can fix the horse frame height adjustment device and prevent its movement from affecting the hole expansion process.

[0087] It should be noted that, as Figure 1 and Figure 2 shown, the horse frame height adjustment device of the utility model is a hydraulic cylinder 340, and the adjustable-height horse frame 300 is a hydraulic adjustable-height horse frame 300; the hydraulic cylinder 340 includes a hydraulic cylinder base 342 and a hydraulic cylinder piston 341; the hydraulic cylinder piston 341 is fixedly connected to the hydraulic cylinder base 342, the hydraulic cylinder base 342 is arranged in the second concave cavity 352, the hydraulic cylinder piston 341 is connected to the upper part 310 of the horse frame, and the hydraulic cylinder piston 341 can lift the upper part 310 of the horse frame and make the upper part 310 of the horse frame fall back onto the support member.

[0088] To position the upper part 310 and the lower part 350 of the horse frame, as Figures 1 to 6As shown in the figure, the upper part 310 of the horse frame of the present utility model is provided with a first upper positioning guide post hole 311 and a second upper positioning guide post hole that are parallel to each other; the lower part 350 of the horse frame is provided with a first lower positioning guide post hole 351 and a second lower positioning guide post hole that are parallel to each other; wherein, the first upper positioning guide post hole 311 and the first lower positioning guide post hole 351 are in corresponding positions and communicate with each other, and the two together form a first positioning guide post 320 hole, and a first positioning guide post 320 is arranged in the first positioning guide post 320 hole; the second upper positioning guide post hole and the second lower positioning guide post hole are in corresponding positions and communicate with each other, and the two together form a second positioning guide post hole, and a second positioning guide post is arranged in the second positioning guide post hole.

[0089] Compared with the prior art, by arranging the first positioning guide post 320 and the second positioning guide post, the present utility model can ensure that the upper part 310 of the horse frame remains in the same position as the lower part 350 of the horse frame in the vertical direction during the process of being jacked up or falling back, and can play a role in positioning and connecting the upper part 310 and the lower part 350 of the horse frame.

[0090] It should be noted that, as Figure 7 shown, the support components of the present utility model include a first positioning block 330 and a second positioning block with the same structure; both the first positioning block 330 and the second positioning block are rectangular positioning blocks.

[0091] Specifically, the first positioning block 330 and the second positioning block have the same structure. When it is necessary to adjust the height of the adjustable-height horse frame 300 to generate a height difference with the fixed-height horse frame 400, the upper part 310 of the horse frame is jacked up by the hydraulic cylinder piston 341. At this time, there is a certain gap between the upper part 310 of the horse frame and the lower part 350 of the horse frame. Place the first positioning block 330 at a position close to the first positioning guide post 320, and place the second positioning block at a position close to the second positioning guide post. After the first positioning block 330 and the second positioning block are placed, the hydraulic cylinder piston 341 falls back, and the upper part 310 of the horse frame is placed on the top surfaces of the first positioning block 330 and the second positioning block. At this time, the first positioning block 330 and the second positioning block play a role in support and force bearing, and the hydraulic cylinder 340 does not bear pressure.

[0092] It should be noted that the thickness specifications of the first positioning block 330 and the second positioning block are the same, and both are composed of multiple groups of positioning blocks with different thickness specifications to meet the needs of different height differences of the horse frame. For example, a positioning block with a thickness of 10 mm, a positioning block with a thickness of 20 mm, a positioning block with a thickness of 30 mm, a positioning block with a thickness of 70 mm, and a positioning block with a thickness of 150 mm. When in use, the thickness specifications of the first positioning block 330 and the second positioning block selected at the same time are the same.

[0093] In order to fix the first positioning block 330 and the second positioning block, as Figure 7As shown in the figure, a first guide post cavity is provided on the first positioning stop block 330 of the present utility model, and a second guide post cavity is provided on the second positioning stop block; after the upper part 310 of the horse frame is jacked up by the hydraulic cylinder piston 341, a certain gap is formed between the upper part 310 of the horse frame and the lower part 350 of the horse frame. At this time, the first positioning stop block 330 is stuck on the first positioning guide post 320 through the first guide post cavity, and the second positioning stop block is stuck on the second positioning guide post through the second guide post cavity. Then, the hydraulic cylinder piston 341 falls back, and the upper part 310 of the horse frame is placed on the top surfaces of the first positioning stop block 330 and the second positioning stop block.

[0094] Specifically, the first guide post cavity and the second guide post cavity have the same specifications and both are rectangular plus semi-circular cavities. The radii of the first guide post cavity and the second guide post cavity are the same as those of the first positioning guide post 320 and the second positioning guide post. The purpose of setting a section of rectangular cavity in the first guide post cavity and the second guide post cavity is to better stick to the corresponding positioning guide posts and prevent the first positioning stop block 330 and the second positioning stop block from falling off.

[0095] Compared with the prior art, in the present utility model, the first positioning stop block 330 is stuck on the first positioning guide post 320 through the first guide post cavity, and the second positioning stop block is stuck on the second positioning guide post through the second guide post cavity, which facilitates the positioning and fixation of the first positioning stop block 330 and the second positioning stop block.

[0096] It should be emphasized that the relationship between the sum of the height H32 of the lower part 350 of the adjustable-height horse frame 300 and the height H31 of the upper part 310 of the adjustable-height horse frame 300 and the height H40 of the fixed-height horse frame 400 is:

[0097] 100mm ≤ H40 - (H32 + H31) ≤ 150mm.

[0098] It should be pointed out that the reaming device for the large-diameter variable cross-section cylinder body of the present utility model further includes a transmission mechanism; the transmission mechanism is fixedly connected to one end of the horse bar 6, and the transmission mechanism can drive the horse bar 6 to rotate unidirectionally, thereby driving the variable cross-section cylinder body to rotate unidirectionally.

[0099] Specifically, the transmission mechanism of the present utility model is a one-way transmission device, and the one-way transmission device is connected to one end of the horse bar 6. During reaming, the one-way transmission device can drive the horse bar 6 to rotate unidirectionally for one week, so that the horse bar 6 drives the multi-step cylinder blank to rotate for one week for reaming.

[0100] It should be emphasized that the reaming device for the large-diameter variable cross-section cylinder body of the present utility model further includes a hydraulic press; the hydraulic press is provided with a movable crossbeam, and the multi-step reaming hammer head 5 is arranged on the movable crossbeam and can move up and down with the movable crossbeam to apply pressure to the multi-step cylinder blank to complete the reaming action.

[0101] It should be noted that the relationship between the inner and outer diameters of each section of the prefabricated cylinder blank and the inner and outer diameters of each section of the finished cylinder forging is as follows:

[0102] For the first section of the prefabricated cylinder, abbreviated as section 1: (D11 2 - D10 2 ) = (D21 2 - D20 2 );

[0103] For the second section of the prefabricated cylinder, abbreviated as section 2: (D12 2 - D10 2 ) = (D22 2 - D20 2 );

[0104] For the third section of the prefabricated cylinder, abbreviated as section 3: (D13 2 - D10 2 ) = (D23 2 - D20 2 ).

[0105] Among them, D10 is the inner diameter of the prefabricated cylinder (i.e., the inner diameter of the multi-step cylinder blank); D11 is the outer diameter of the first section of the prefabricated cylinder; D12 is the outer diameter of the second section of the prefabricated cylinder; D13 is the outer diameter of the third section of the prefabricated cylinder; D20 is the inner diameter of the finished cylinder; D21 is the outer diameter of the first section of the finished cylinder; D22 is the outer diameter of the second section of the finished cylinder; D23 is the outer diameter of the third section of the finished cylinder.

[0106] Given the inner and outer diameter dimensions of each section of the finished cylinder forging, based on the relationship between the inner and outer diameters of each section of the prefabricated cylinder blank and the inner and outer diameters of each section of the finished cylinder forging, the inner and outer diameters of each section of the prefabricated cylinder blank can be obtained, and then a multi-step cylinder blank can be prefabricated.

[0107] It should be noted that after each ring of hole expansion is completed, adjust the height difference between the two side horse frames so that the height of the horse frame on the side with a smaller inner diameter of the multi-step cylinder blank is higher than the height of the horse frame on the side with a larger inner diameter, and the maximum height difference between the adjustable height horse frame 300 and the fixed height horse frame 400 is less than or equal to 150 mm.

[0108] In summary, the reaming device of the present utility model includes an adjustable-height horse stand 300 and a fixed-height horse stand 400. The adjustable-height horse stand 300 and the fixed-height horse stand 400 are respectively located on both sides of the cylindrical blank. The adjustable-height horse stand 300 can generate a certain height difference with the fixed-height horse stand 400 through the expansion and contraction of its hydraulic cylinder piston 341. Before reaming forming, the present utility model needs to prepare a multi-step cylindrical blank (that is, the outer circle of the cylindrical blank has multiple steps. For example, a three-step cylindrical blank of a prefabricated cylinder first section, a prefabricated cylinder second section, and a prefabricated cylinder third section). During the reaming process, according to the deformation conditions at both ends of the cylindrical blank, the height difference between the two side horse stands is adjusted in real time and dynamically, which can effectively solve the problem of asynchronous deformation at both ends during the reaming of the variable cross-section cylinder.

[0109] The process of reaming using the above reaming device for a large-diameter variable cross-section cylinder includes:

[0110] Step 1, prefabricate a multi-step cylindrical blank;

[0111] Prefabricate a multi-step cylindrical blank according to the relationship between the inner and outer diameters of each section of the prefabricated cylindrical blank and the inner and outer diameters of each section of the finished cylinder forging; the relationship between the inner and outer diameters of each section of the prefabricated cylindrical blank and the inner and outer diameters of each section of the finished cylinder forging is:

[0112] Prefabricate the first section of the prefabricated cylinder, abbreviated as section 1: (D11 2 - D10 2 ) = (D21 2 - D20 2 );

[0113] Prefabricate the second section of the prefabricated cylinder, abbreviated as section 2: (D12 2 - D10 2 ) = (D22 2 - D20 2 );

[0114] Prefabricate the third section of the prefabricated cylinder, abbreviated as section 3: (D13 2 - D10 2 ) = (D23 2 - D20 2 ).

[0115] Among them, D10 is the inner diameter of the prefabricated cylinder (i.e., the inner diameter of the multi-step cylindrical blank); D11 is the outer diameter of the first section of the prefabricated cylinder; D12 is the outer diameter of the second section of the prefabricated cylinder; D13 is the outer diameter of the third section of the prefabricated cylinder; D20 is the inner diameter of the finished cylinder; D21 is the outer diameter of the first section of the finished cylinder; D22 is the outer diameter of the second section of the finished cylinder; D23 is the outer diameter of the third section of the finished cylinder.

[0116] Step 2: Assemble the reaming device for the large-diameter variable cross-section cylinder body, and use the reaming device for the large-diameter variable cross-section cylinder body to ream the multi-step cylinder blank; specifically, it includes the following processes:

[0117] Step 21: Heat the multi-step cylinder blank, and place the multi-step cylinder blank on the mandrel 6 after heating;

[0118] Step 22: Lift the mandrel 6 and the multi-step cylinder blank together and place them on the tops of the adjustable-height horse frame 300 and the fixed-height horse frame 400. Both ends of the mandrel 6 are embedded in the horse frame fixing grooves;

[0119] Step 23: Adjust the height of the adjustable-height horse frame 300 to be equal to the height of the fixed-height horse frame 400;

[0120] In the above Step 23, before the reaming starts, the initial height of the adjustable-height horse frame 300 (i.e., the height when the first positioning block 330 and the second positioning block are not set) is less than the height of the fixed horse frame; when starting the reaming, adjust the height of the adjustable-height horse frame 300 to be the same as the height of the fixed horse frame.

[0121] In the above Step 23, use the hydraulic cylinder piston 341 to lift the upper part 310 of the horse frame, and set the first positioning block 330 and the second positioning block in the gap generated between the upper part 310 and the lower part 350 of the horse frame; among them, the first positioning block 330 is stuck on the first positioning guide post 320 through its first guide post cavity, and the second positioning block is stuck on the second positioning guide post through its second guide post cavity. After the first positioning block 330 and the second positioning block are placed, the hydraulic cylinder piston 341 falls back, and the upper part 310 of the horse frame is supported and held by the first positioning block 330 and the second positioning block. At this time, the first positioning block 330 and the second positioning block play a role in support and force bearing, and the hydraulic cylinder 340 does not bear pressure.

[0122] Step 24: Perform the first circle of reaming;

[0123] When the adjustable-height horse frame 300 is arranged at the large end of the multi-step cylinder blank, when reaming the first circle, use the hydraulic press to drive the movable crossbeam to drive the multi-step reaming hammer head to apply pressure to the multi-step cylinder blank for reaming. After the first circle of reaming is completed, since the outer diameter of the first cross-section of the prefabricated cylinder is larger than the outer diameter of the third cross-section of the prefabricated cylinder, according to the principle of constant cross-sectional area before and after reaming, after the first circle of reaming is completed, the inner diameter of the large end of the multi-step cylinder blank is smaller than the inner diameter of its small end;

[0124] Step 25: Second circle of reaming;

[0125] After the first round of reaming is completed, the inner diameter of the large end of the multi-step cylindrical blank is smaller than that of the small end. At this time, the height of the adjustable-height horse frame 300 is increased. This process includes: using the hydraulic cylinder piston 341 to lift the upper part 310 of the horse frame, and selecting a first positioning block 330 and a second positioning block with suitable specifications according to actual requirements in the gap generated between the upper part 310 and the lower part 350 of the horse frame. Among them, the first positioning block 330 is stuck on the first positioning guide post 320 through its first guide post concave cavity, and the second positioning block is stuck on the second positioning guide post through its second guide post concave cavity. After the first positioning block 330 and the second positioning block are placed, the hydraulic cylinder piston 341 falls back, and the upper part 310 of the horse frame is supported and held by the first positioning block 330 and the second positioning block, and the height of the adjustable-height horse frame 300 is increased, creating a height difference between the adjustable-height horse frame 300 and the fixed-height horse frame 400 (as Figure 13 shown); then the second round of reaming begins. The hydraulic press drives the movable crossbeam and then drives the multi-step reaming hammer head to apply force to the multi-step cylindrical blank for reaming. During the reaming process, the one-way transmission device can drive the horse bar 6 and then drive the multi-step cylindrical blank to rotate unidirectionally. After one rotation, the second round of reaming is completed.

[0126] Step 26, the third round of reaming;

[0127] After the second round of reaming is completed, the inner diameter of the large end of the multi-step cylindrical blank is larger than that of the small end; at this time, the height of the adjustable-height horse frame 300 is decreased. This process includes: using the hydraulic cylinder piston 341 to lift the upper part 310 of the horse frame, and selecting the first positioning block 330 and the second positioning block according to actual requirements in the gap generated between the upper part 310 and the lower part 350 of the horse frame; among them, the first positioning block 330 is stuck on the first positioning guide post 320 through its first guide post concave cavity, and the second positioning block is stuck on the second positioning guide post through its second guide post concave cavity. After the first positioning block 330 and the second positioning block are set, the hydraulic cylinder piston 341 falls back, and the upper part 310 of the horse frame is supported and held by the first positioning block 330 and the second positioning block, and the height of the adjustable-height horse frame 300 is increased, creating a height difference between the adjustable-height horse frame 300 and the fixed-height horse frame 400 (as Figure 14 shown); then the second round of reaming begins. The hydraulic press drives the movable crossbeam and then drives the multi-step reaming hammer head to apply pressure to the multi-step cylindrical blank for reaming. During the reaming process, the one-way transmission device can drive the horse bar 6 and then drive the multi-step cylindrical blank to rotate unidirectionally. After one rotation, the third round of reaming is completed.

[0128] Step 27, continue the reaming operation. When the multi-step cylindrical blank is reamed to the finished product size, stop the reaming operation to obtain a large-diameter variable cross-section cylinder.

[0129] In the above step 27, after each circle of hole expansion is completed, measure the inner hole diameters of the large end and the small end of the multi-step cylindrical billet. According to the deviation of the inner hole diameters at both ends, dynamically adjust the height difference between the two sides of the mandrel in real time. That is, when the inner diameter of the large end is greater than the inner diameter of the small end, adjust the height of the adjustable-height mandrel 300 to be less than the height of the fixed-height mandrel 400, and then start hole expansion; after one circle of hole expansion is completed, when the inner diameter of the large end is less than the inner diameter of the small end, adjust the height of the adjustable-height mandrel 300 to be greater than the height of the fixed-height mandrel 400, and then start hole expansion until the cylindrical billet meets the manufacturing requirements.

[0130] It should be noted that the diameter range of the multi-step cylindrical billet of the present utility model is 3m - 6m.

[0131] Embodiment 1

[0132] Given the finished product dimensions of a nuclear power pressure vessel cylindrical forging, as follows Figure 16 shown. The finished forging weighs 270t and is forged using a 450t steel ingot. After the steel ingot is subjected to cogging forging, the following multi-step cylindrical body is prefabricated Figure 17 shown. Among them, the inner and outer diameter dimensions of each part of the prefabricated cylindrical body are obtained based on the principle that the cross-sectional area remains the same before and after hole expansion.

[0133] Using this hole expansion device for hole expansion, the hole expansion process is as follows:

[0134] First circle of hole expansion: Before the first circle of hole expansion, add a first positioning block 330 with a thickness of 150mm and a second positioning block to the adjustable-height mandrel 300 on the large end side. The height difference between the two sides of the mandrel is 0mm, and the first reduction amount is 60mm. Considering that only circumferential deformation occurs during the hole expansion process and axial deformation is ignored, and only the inner and outer diameters at both ends are used as references subsequently. Before the first circle of hole expansion, the outer diameter of the large end is 4080mm, the inner diameter is 2430mm, the outer diameter of the small end is 3730mm, and the inner diameter of the small end is the same as the inner diameter of the large end; according to the principle that the cross-sectional area remains unchanged before and after hole expansion, after the first circle of hole expansion is completed, the outer diameter of the large end is 4275mm, the inner diameter of the large end is 2745mm, the outer diameter of the small end is 3983mm, and the inner diameter of the small end is 2803mm, as Figures 18 to 21 shown.

[0135] Second circle of hole expansion:

[0136] After the first circle of reaming is completed, the inner diameter of the large end is smaller than that of the small end. Before the second circle of reaming, continue to add the first positioning block 330 and the second positioning block with a thickness of 20 mm to the adjustable-height horse support 300 on the large-end side. One side of the adjustable-height horse support 300 is 20 mm higher than the other side. The pressing-down amount of the second circle is 60 mm. Since one side of the adjustable-height horse support 300 is 20 mm higher than the other side, the pressing-down amount of the small end is 40 mm. Similarly, according to the principle that the cross-sectional area remains unchanged before and after reaming, after the second circle of reaming is completed, the outer diameter of the large end is 4514 mm, the inner diameter of the large end is 3104 mm, the outer diameter of the small end is 4190 mm, and the inner diameter of the small end is 3090 mm, as Figures 22 to 25 shown.

[0137] Reaming the third circle:

[0138] After the second circle of reaming is completed, the inner diameter of the large end is slightly larger than that of the small end. Before the third circle of reaming, remove the first positioning block 330 and the second positioning block with a thickness of 20 mm on the large-end side of the adjustable-height horse support 300, and add the first positioning block 330 and the second positioning block with a thickness of 10 mm. One side of the adjustable-height horse support 300 is 10 mm higher than the other side. The pressing-down amount of the third circle is 50 mm. Since one side of the adjustable-height horse support 300 is 10 mm higher than the other side, the pressing-down amount of the small end is 40 mm. Similarly, according to the principle that the cross-sectional area remains unchanged before and after reaming, after the third circle of reaming is completed, the outer diameter of the large end is 4755 mm, the inner diameter of the large end is 3445 mm, the outer diameter of the small end is 4435 mm, and the inner diameter of the small end is 3415 mm, as Figures 26 to 29 shown.

[0139] Reaming the fourth circle:

[0140] After the third circle of reaming is completed, the inner diameter of the large end is larger than that of the small end. The adjustable-height horse support 300 is at the same height as the third circle. The pressing-down amount of the fourth circle is 50 mm. Since one side of the adjustable-height horse support 300 is 10 mm higher than the other side, the pressing-down amount of the small end is 40 mm. Similarly, according to the principle that the cross-sectional area remains unchanged before and after reaming, after the fourth circle of reaming is completed, the outer diameter of the large end is 5044 mm, the inner diameter of the large end is 3834 mm, the outer diameter of the small end is 4729 mm, and the inner diameter of the small end is 3789 mm, as Figures 30 to 33 shown.

[0141] Reaming the fifth circle:

[0142] After the fourth round of hole expansion, the inner diameter of the large end is larger than the inner diameter of the small end. The 10mm thick first positioning block 330 and the second positioning block on one side of the adjustable height frame 300 are removed, and only the 150mm thick first positioning block 330 and the second positioning block are retained. The height difference of the frames on both sides is 0mm. The fifth round of pressing is 20mm. Similarly, according to the principle that the cross-sectional area before and after hole expansion remains unchanged, after the fifth round of hole expansion, the outer diameter of the large end is 5175mm, the inner diameter of the large end is 4005mm, the outer diameter of the small end is 4898mm, and the inner diameter of the small end is 3998mm. Figures 34 to 37 shown.

[0143] After the fifth round of hole expansion, the inner diameter of the large end is 4005mm, and the process requirement is 4000mm. The outer diameter is 5175mm, and the process requirement is 5170mm. The inner diameter of the small end is 3998mm, and the process requirement is 4000mm. The outer diameter of the small end is 4898mm, and the process requirement is 4900mm. These are very close to the process requirement dimensions and meet the manufacturing requirements.

[0144] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the present invention should be included in the protection scope of the present invention.

Claims

1. A reaming device for a large-diameter variable cross-section cylinder, characterized in that, It includes adjustable-height trestles, fixed-height trestles, trestle bars and multi-step reaming hammers; The adjustable-height trestles and the fixed-height trestles are respectively located on both sides of the large-diameter variable-section cylinder; after the trestle bar penetrates through the large-diameter variable-section cylinder, its two ends are respectively fixed on the tops of the adjustable-height trestles and the fixed-height trestles, and the multi-step reaming hammer is used for reaming the large-diameter variable-section cylinder; By dynamically adjusting the height of the adjustable-height trestle in real time, the height difference between the adjustable-height trestle and the fixed-height trestle can be dynamically adjusted in real time.

2. The reaming device for a large-diameter variable cross-section cylinder according to claim 1, characterized in that, The adjustable-height trestle includes an upper trestle part, a lower trestle part, a trestle height adjustment device and a support component; The trestle height adjustment device is arranged between the upper trestle part and the lower trestle part; the trestle height adjustment device can jack up the upper trestle part, and after the upper trestle part is jacked up, place the support component in the gap between the upper trestle part and the lower trestle part, and then let the upper trestle part fall back onto the support component; Through the trestle height adjustment device and the support component, the height difference between the adjustable-height trestle and the fixed-height trestle can be dynamically adjusted in real time.

3. The reaming device for a large-diameter variable cross-section cylinder according to claim 2, characterized in that, A first concave cavity is provided on the bottom end surface of the upper trestle part, and a second concave cavity is provided on the top end surface of the lower trestle part. The positions of the first concave cavity and the second concave cavity correspond to each other and have the same shape; The first concave cavity and the second concave cavity together form the accommodation cavity of the trestle height adjustment device.

4. The reaming device for a large-diameter variable cross-section cylinder according to claim 3, characterized in that, The trestle height adjustment device is a hydraulic cylinder; the hydraulic cylinder includes a hydraulic cylinder base and a hydraulic cylinder piston; The hydraulic cylinder piston is fixedly connected to the hydraulic cylinder base. The hydraulic cylinder piston is arranged in the first concave cavity, the hydraulic cylinder base is arranged in the second concave cavity, the hydraulic cylinder piston is connected to the upper trestle part, and the hydraulic cylinder piston can jack up the upper trestle part and can make the upper trestle part fall back onto the support component.

5. The reaming device for a large-diameter variable cross-section cylinder according to claim 4, characterized in that, The upper trestle part is provided with a first upper positioning guide post hole and a second upper positioning guide post hole that are parallel to each other; the lower trestle part is provided with a first lower positioning guide post hole and a second lower positioning guide post hole that are parallel to each other; The first upper positioning guide post hole corresponds to and communicates with the first lower positioning guide post hole, and the two together form a first positioning guide post hole. A first positioning guide post is arranged in the first positioning guide post hole; the second upper positioning guide post hole corresponds to and communicates with the second lower positioning guide post hole, and the two together form a second positioning guide post hole. A second positioning guide post is arranged in the second positioning guide post hole.

6. The reaming device for a large-diameter variable cross-section cylinder according to claim 5, characterized in that, The support component includes a first positioning block and a second positioning block with the same structure; Both the first positioning block and the second positioning block are rectangular positioning blocks.

7. The reaming device for a large-diameter variable cross-section cylinder according to claim 6, characterized in that, A first guide post concave cavity is provided on the first positioning block, and a second guide post concave cavity is provided on the second positioning block; After the upper part of the horse frame is jacked up by the piston of the hydraulic cylinder, a certain gap is formed between the upper part of the horse frame and the lower part of the horse frame. The first positioning block can be stuck on the first positioning guide post through the concave cavity of the first guide post, and the second positioning block can be stuck on the second positioning guide post through the concave cavity of the second guide post. Then, the piston of the hydraulic cylinder falls back onto the first positioning block and the second positioning block.

8. The reaming device for a large-diameter variable cross-section cylinder according to claim 1, characterized in that, The relationship between the sum of the height H32 of the lower part of the horse frame and the height H31 of the upper part of the horse frame and the height H40 of the fixed-height horse frame is: 100mm ≤ H40 - (H32 + H31) ≤ 150mm.

9. The reaming device for a large-diameter variable cross-section cylinder according to claim 1, characterized in that It also includes a transmission mechanism; The transmission mechanism is fixedly connected to one end of the horse bar, and the transmission mechanism can drive the horse bar to rotate unidirectionally, thereby driving the large-diameter variable cross-section cylinder to rotate unidirectionally.

10. The reaming device for a large-diameter variable cross-section cylinder according to any one of claims 1 to 9, characterized in that, It also includes a hydraulic press; a movable crossbeam is provided on the hydraulic press, and the multi-step type reaming hammer head is arranged on the movable crossbeam and can move up and down with the movable crossbeam.

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