Auxiliary device for mounting small-caliber butterfly valve

Abstract

The invention relates to an auxiliary device for mounting a small-caliber butterfly valve, and relates to the technical field of butterfly valve assembly.The auxiliary device for mounting the small-caliber butterfly valve comprises a workbench used for supporting or fixing a valve body; the supporting table is located on one side of the workbench; the cantilever mechanism comprises a stand column and a cantilever beam, the stand column is vertically arranged on the supporting table and rotationally connected with the supporting table, the cantilever beam is horizontally arranged, one end of the cantilever beam is connected to the upper end of the stand column, and the other end of the cantilever beam extends to the position above the workbench; and the crimping execution mechanism comprises a hydraulic cylinder and a liquid supply assembly, the liquid supply assembly communicates with the hydraulic cylinder, the hydraulic cylinder is vertically arranged and located over the workbench, the hydraulic cylinder is connected with the cantilever beam, a crimping column is vertically arranged at the lower end of the hydraulic cylinder, and the crimping column is connected with the driving end of the hydraulic cylinder. According to the butterfly valve, the assembling mode of the valve shaft is improved, the stress state in the valve shaft assembling process is improved, the risk that the rubber valve seat is scratched and damaged due to uneven stress is reduced, and the mounting efficiency and the finished product yield of the butterfly valve are improved.

Description

Technical Field

[0001] This application relates to the technical field of butterfly valve assembly, and in particular to an auxiliary device for installing small-diameter butterfly valves. Background Technology

[0002] Small-diameter butterfly valves are widely used in various fluid control systems due to their simple structure, rapid opening and closing, and low flow resistance. These valves are usually used as shut-off and throttling devices in pipeline systems and play an important role in industrial production.

[0003] Currently, in the existing butterfly valve assembly process, the general assembly steps are as follows: first, the rubber valve seat is installed inside the valve body; then, the butterfly plate is placed in the predetermined position inside the valve seat; finally, the upper valve shaft and / or lower valve shaft are inserted from outside the valve body through the valve seat shaft hole to achieve connection and positioning with the butterfly plate.

[0004] Regarding the aforementioned technologies, the presence of rubber valve seats and other rubber seals generates significant friction on the valve shaft during installation of the upper and / or lower valve shafts, making installation difficult. Currently, the common method for assembling valve shafts is to tap them into the valve body. While this method is simple, effective, and requires low-cost equipment, the tapping generates a large impact force at the moment of impact, and it's difficult to ensure the force direction perfectly aligns with the valve body axis. This can lead to scratches or damage to the rubber valve seat, directly affecting the sealing performance and service life of the butterfly valve. Summary of the Invention

[0005] This application provides an auxiliary device for installing small-diameter butterfly valves. Its purpose is to improve the assembly method of the valve shaft, improve the stress state during the assembly process, reduce the risk of scratching and damage to the rubber valve seat due to uneven stress, and improve the installation efficiency and yield of the butterfly valve.

[0006] The technical solution provided in this application for an auxiliary device for installing small-diameter butterfly valves is as follows: An auxiliary device for installing small-diameter butterfly valves includes a workbench for supporting or fixing the valve body; a support platform located on one side of the workbench; a cantilever mechanism including a column and a cantilever beam, the column being vertically mounted on the support platform and rotatably connected to the support platform, the cantilever beam being horizontally mounted, one end of the cantilever beam being connected to the upper end of the column, and the other end extending above the workbench; and a pressing actuator including a hydraulic cylinder and a fluid supply assembly, the fluid supply assembly being connected to the hydraulic cylinder, the hydraulic cylinder being vertically mounted and located directly above the workbench, the hydraulic cylinder being connected to the cantilever beam, and a pressing column being vertically mounted at the lower end of the hydraulic cylinder, the pressing column being connected to the drive end of the hydraulic cylinder.

[0007] By adopting the above technical solution, the valve body is stably supported by the workbench, and with the pressing actuator located directly above, the vertical thrust generated by the hydraulic cylinder can be applied to the valve shaft, thereby allowing the valve shaft to be inserted into the valve body axially, thus realizing the automatic assembly of the valve shaft.

[0008] Compared to existing hammer-installation methods, this vertical hydraulic propulsion method provides a smooth and continuous axial thrust, overcoming the static friction between the valve shaft and the rubber valve seat, and effectively avoiding scratches or tears to the rubber seals caused by excessive instantaneous impact or deviation in the force application angle.

[0009] Meanwhile, the rotating connection between the column and the support platform allows the cantilever mechanism to swing horizontally around the column as its axis. When placing or removing the valve body, the cantilever beam can be rotated to one side to free up operating space; when pressing the valve shaft, the cantilever beam can be rotated back to directly above the worktable. This structural design ensures the centering of the pressing operation and facilitates the handling and alignment of valve bodies of different sizes by the operator, thereby improving work efficiency.

[0010] Optionally, a diagonal brace is provided between the column and the cantilever beam, with one end of the diagonal brace connected to the cantilever beam and the other end connected to the column.

[0011] By adopting the above technical solution, the diagonal brace, together with the column and cantilever beam, forms a stable triangular support structure. When the hydraulic cylinder outputs a huge thrust downwards, the cantilever beam will be subjected to a corresponding reverse bending moment. At this time, the diagonal brace can effectively share the force of the cantilever beam, increase the rigidity of the overall structure, and prevent the cantilever beam from undergoing elastic deformation or permanent deformation due to excessive force, thereby ensuring the verticality of the pressing trajectory of the pressing column and ensuring the pressing accuracy.

[0012] Optionally, the cantilever beam is slidably connected to the column in the vertical direction, and a first adjustment and locking mechanism is provided between the cantilever beam and the column, the first adjustment and locking mechanism being used to lock the cantilever beam and the column.

[0013] By adopting the above technical solution, the sliding connection between the cantilever beam and the column, as well as the design of the first adjustment and locking mechanism, makes the height position of the cantilever beam on the column adjustable.

[0014] Based on this, since the maximum stroke of the hydraulic cylinder is fixed, the distance between the hydraulic cylinder and the worktable can be adjusted by changing the height of the cantilever beam, thus matching the effective working stroke of the hydraulic cylinder to the assembly of butterfly valves of different heights. This design ensures that regardless of the specifications of the butterfly valve to be assembled, the hydraulic cylinder can be adjusted to the optimal starting working height, avoiding problems such as insufficient hydraulic cylinder stroke due to an excessively short valve body preventing the valve shaft from being pressed into place, or interference between the valve body and the hydraulic cylinder due to an excessively high valve body preventing valve shaft assembly. Therefore, this design improves the compatibility and adaptability of the installation auxiliary device of this application.

[0015] Optionally, a connecting sleeve is fixedly connected to one end of the cantilever beam facing the column. The connecting sleeve is coaxially sleeved on the outside of the column, and the connecting sleeve is slidably connected to the column in the vertical direction. The first adjustment and locking mechanism includes a first locking pin. A plurality of first positioning holes are sequentially spaced along the vertical direction on the column. A first through hole is provided on the connecting sleeve. The first positioning hole and the first through hole are coaxially connected. The first locking pin is coaxially inserted into the first through hole and the corresponding first positioning hole.

[0016] By adopting the above technical solution, the first adjustment and locking mechanism realizes the mechanical rigid locking between the column and the cantilever beam by the insertion and cooperation of the first locking pin and the first positioning hole. Since the pin connection can withstand greater shear force, it ensures that the connecting sleeve will not slide upward on the column when the hydraulic cylinder applies high tonnage pressure, thus ensuring the safety and stability of the cantilever mechanism under heavy load conditions.

[0017] Optionally, the hydraulic cylinder is slidably connected to the cantilever beam in the vertical direction, and a second adjustment and locking mechanism is provided between the cantilever beam and the hydraulic cylinder, the second adjustment and locking mechanism being used to lock the cantilever beam and the hydraulic cylinder.

[0018] By adopting the above technical solution, due to the large structure and heavy weight of the cantilever mechanism, the movement resistance and difficulty of the cantilever beam during the adjustment process are relatively large, making it difficult to achieve high-precision adjustment. Therefore, the vertical position adjustment of the cantilever beam is mainly suitable for large-span size adjustment of valves of different diameters.

[0019] Therefore, by utilizing the sliding connection between the hydraulic cylinder and the cantilever beam, along with the coordinated design of the second adjusting and locking mechanism, independent vertical height adjustment of the hydraulic cylinder is achieved. Since the hydraulic cylinder is smaller and lighter than the cantilever mechanism, the difficulty of vertical height adjustment is reduced, making it easier to perform precise adjustments of small dimensions. This allows the hydraulic cylinder to adapt to valves of different diameters for small-span dimensional changes, or effectively compensate for height variations in butterfly valves of the same model caused by manufacturing tolerances and tooling differences.

[0020] Based on this, the adjustable height design of the cantilever beam in the vertical direction combined with the adjustable height design of the hydraulic cylinder can form a two-stage adjustment system that complements the large-range coarse adjustment and the small-range fine adjustment. This design expands the size of the butterfly valve that can be processed by the installation auxiliary device, and at the same time sets the single pressing stroke of the hydraulic cylinder in the optimal range, minimizing the ineffective idle stroke, so that the equipment takes into account both versatility and operational accuracy.

[0021] Optionally, the crimping post includes a fixed post, a flexible buffer, and an actuating post; the flexible buffer includes a sleeve, a sliding post, and a buffer spring, the sleeve is coaxially sleeved on the outside of the sliding post, the sleeve is slidably connected to the sliding post along its own axial direction, the buffer spring is coaxially disposed inside the sleeve, and one end of the buffer spring is connected to the sleeve and the other end is connected to the sliding post, the buffer spring is in a compressed state; one end of the fixed post is coaxially connected to the sleeve and the other end is coaxially connected to the drive end of the hydraulic cylinder, and one end of the actuating post is coaxially connected to the sliding post.

[0022] By adopting the above technical solution, under the structural design of the crimping column, the buffer spring is in a pre-compressed state, which gives the crimping column a certain rigidity in the initial stage.

[0023] Therefore, during normal press-fitting, as long as the reaction force of the valve shaft on the actuator is less than the initial elastic force provided by the buffer spring, the flexible buffer will exhibit rigid transmission and can efficiently transmit hydraulic thrust to push the valve shaft in.

[0024] However, when a dead limit or overshoot occurs, that is, when the valve shaft has been pressed to the bottom but the hydraulic cylinder still has downward inertia or stroke margin, the reaction force of the valve shaft on the actuator increases instantaneously and overcomes the initial elastic force provided by the buffer spring, forcing the buffer spring to compress further. At this time, the slide retracts into the sleeve.

[0025] This process transforms the rigid impact energy that could otherwise cause valve shaft damage, valve body crushing, or rubber damage into the elastic potential energy of the buffer spring, thereby achieving flexible energy absorption and overload protection, and solving the risk of valve body or device damage caused by dimensional tolerances in rigid press fitting.

[0026] Optionally, the fixed column, the sleeve, and the drive end of the hydraulic cylinder can all be detachably connected, and the actuating column and the sliding column can be detachably connected.

[0027] By adopting the above technical solution, the flexible buffer component can be disassembled and replaced. Therefore, when it is necessary to assemble it to fit a synchronous butterfly valve, the flexible buffer component and the actuator can be replaced, ensuring the crimping column can be used normally. This improves the applicability of the crimping column and reduces its maintenance and operating costs.

[0028] Optionally, the system also includes a positioning detection component, which includes a positioning controller and two ranging sensors. The ranging sensors are mounted on the hydraulic cylinder and are vertically positioned. A target plate is mounted on both the fixed column and the actuating column. The ranging sensors are configured to correspond one-to-one with the target plates, and the detection ends of the ranging sensors are vertically aligned with the target plates. Both ranging sensors and the fluid supply component are electrically connected to the positioning controller.

[0029] By employing the above technical solution, with the cooperation of two ranging sensors and two target plates, one ranging sensor and its corresponding target plate can detect the position of the fixed column in real time, thereby determining the extension length of the piston rod end of the hydraulic cylinder. The other ranging sensor and its corresponding target plate can detect the position of the actuating column in real time.

[0030] Under normal crimping conditions, the reading difference between the two ranging sensors remains constant, meaning the flexible buffer is not compressed. However, when the reading difference between the two ranging sensors changes, the flexible buffer begins to compress, indicating that the valve shaft has been pressed against the bottom or encountered abnormal resistance.

[0031] Therefore, the positioning controller can acquire this information and accordingly control the fluid supply assembly to stop or drive the hydraulic cylinder to retract. This design achieves a leap from blind pressure to intelligent closed-loop control, ensuring the accuracy of the pressing process and preventing overpressure.

[0032] Optionally, a hard limiting component is also included, which includes a mounting rod and a limiting plate. The mounting rod is vertically arranged, and its upper end is connected to the hydraulic cylinder. The lower end of the mounting rod is connected to the limiting plate, and the limiting plate is horizontally arranged. An anti-impact plate is provided on the fixed column. The anti-impact plate is horizontally arranged and located directly above the limiting plate. The limiting plate and the anti-impact plate are vertically aligned.

[0033] By adopting the above technical solution, a hard limit is formed for the hydraulic cylinder through the cooperation of the mounting rod, the limiting plate, and the anti-impact plate. When the hydraulic cylinder descends to its limit position, the anti-impact plate will directly impact the limiting plate fixed to the hydraulic cylinder body. This hard metal-to-metal collision forcibly cuts off the downward path of the hydraulic cylinder, using physical obstruction to limit the maximum stroke, thus ensuring that no matter how the hydraulic components output, the valve shaft will not be pressed down indefinitely and damage the butterfly valve components.

[0034] Optionally, a soft limit component is also included, which includes a soft limit controller and a limit sensor. The limit sensor is located below the limit plate and connected to the limit plate. The limit sensor is vertically arranged and its detection end is facing the anti-impact plate. The limit sensor and the liquid supply component are both electrically connected to the soft limit controller.

[0035] By adopting the above technical solution, the soft limit component, through the coordinated design of the soft limit controller and the limit sensor, when the anti-impact plate approaches the limit plate, the limit sensor detects the signal before the physical impact and triggers the soft limit controller to cut off the output of the fluid supply component, so that the hydraulic cylinder can stop moving.

[0036] This not only prevents the hard limit components from being subjected to frequent and severe impacts, extending the mechanical life, but also serves as a double insurance for stroke control, realizing a safety protection mechanism that combines soft landing and hard lock-up.

[0037] Meanwhile, by utilizing limit sensors to monitor the relative position of the anti-impact plate in real time, the real-time stroke status of the hydraulic cylinder can be fed back. This allows the soft limit controller to precisely control the fluid supply components according to different stroke stages: during the initial idle stroke stage, the hydraulic cylinder is controlled to accelerate downward to shorten non-operation time; during the pressing stage of contacting the valve shaft, a stable hydraulic output is maintained to achieve constant pressure propulsion; and at the end of the stroke near the limit position, the hydraulic cylinder is controlled to decelerate to prevent inertial overshoot. This segmented control strategy improves the operating efficiency and smoothness of the installation auxiliary device of this application while ensuring the pressing quality.

[0038] In summary, this application includes at least one of the following beneficial technical effects: 1. This application utilizes an installation auxiliary device to provide a smooth and continuous axial thrust through a vertical hydraulic propulsion method, thereby enabling the valve shaft to be inserted into the valve body along its own axis, thus achieving automatic assembly of the valve shaft. Because the hydraulic thrust can continuously and stably overcome the static friction generated by the interference fit between the valve shaft and the rubber valve seat, it effectively avoids the instantaneous impact force caused by existing hammering methods. This improves the stress state during valve shaft assembly, reduces the risk of scratching and damage to the rubber valve seat due to uneven stress, and improves the installation efficiency and finished product yield of the butterfly valve.

[0039] 2. This application utilizes a rotating connection design between the column and the support platform, enabling the cantilever mechanism to swing horizontally around the column as its axis. When placing or removing the valve body, the cantilever beam can be rotated to one side to free up operating space; when pressing the valve shaft, the cantilever beam can be rotated back to directly above the worktable. This structural design ensures the centering of the pressing operation and facilitates the handling and alignment of valve bodies of different sizes by the operator, thereby improving work efficiency.

[0040] 3. This application combines the adjustable height of the cantilever beam in the vertical direction with the adjustable height of the hydraulic cylinder to form a two-stage adjustment system that complements the large-range coarse adjustment and the small-range fine adjustment. This increases the size range of butterfly valves that can be assembled by the installation auxiliary device and optimizes the effective stroke of the hydraulic cylinder in a single press-fitting operation, thereby increasing the versatility and operational accuracy of the installation auxiliary device.

[0041] 4. This application achieves a combined design of flexible energy absorption and rigid limiting through the synergistic effect of a flexible buffer, a rigid limiting component, and a positioning detection component. The buffer spring absorbs minor stroke errors caused by accumulated tolerances, ensuring proper valve shaft insertion and positioning. The rigid limiting component provides a final safety margin, preventing hydraulic cylinder overshoot. The positioning detection component controls the equipment to automatically stop based on the actual force applied. The combination of these three components ensures 100% valve shaft compression while reducing the risk of valve shaft damage, valve body crushing, or rubber valve seat damage due to hydraulic cylinder overshoot. Attached Figure Description

[0042] Figure 1 This is a schematic diagram of the overall structure of the installation auxiliary device according to Embodiment 1 of this application.

[0043] Figure 2 This is a side view of the fixture assembly of Embodiment 2 of this application.

[0044] Figure 3 This is a top view of the fixture assembly of Embodiment 2 of this application.

[0045] Figure 4 This is a schematic diagram of the overall structure of the installation auxiliary device according to Embodiment 3 of this application.

[0046] Figure 5 This is a schematic diagram of the overall structure of the installation auxiliary device according to Embodiment 3 of this application from another perspective.

[0047] Figure 6 This is a schematic diagram of the overall structure of the hydraulic cylinder and the pressing column in Embodiment 3 of this application.

[0048] Figure 7 This is a schematic diagram of the overall structure of the crimping post in Embodiment 3 of this application.

[0049] Figure 8This is a cross-sectional structural schematic diagram of the crimping post of Embodiment 3 of this application.

[0050] In the diagram, 1. Workbench; 11. Fixture assembly; 111. Base; 112. Double-acting lead screw; 113. Drive handwheel; 114. V-shaped gripper; 2. Support platform; 3. Cantilever mechanism; 31. Column; 32. Cantilever beam; 321. Connecting sleeve; 322. Vertical slide; 33. Diagonal brace; 4. Pressing actuator; 41. Hydraulic cylinder; 42. Pressing column; 421. Fixed column; 422. Flexible buffer; 4221. Sleeve; 4222. Sliding column; 4223. Buffer spring; 423. Actuating column; 43. 5. Mounting base; 6. First adjustment and locking mechanism; 7. First locking pin; 8. First positioning hole; 9. First through hole; 10. Second adjustment and locking mechanism; 11. Second locking pin; 12. Second positioning hole; 13. Second through hole; 14. Follow-up hard limit mechanism; 15. Hard limit component; 16. Mounting rod; 17. Limiting plate; 18. Adjustment drive component; 19. Anti-impact plate; 10. Soft limit component; 11. Limit sensor; 12. Positioning detection component; 13. Distance sensor; 14. Target plate. Detailed Implementation

[0051] The following is in conjunction with the appendix Figure 1 -Appendix Figure 8 This application will be described in further detail below.

[0052] Example 1: An auxiliary device for installing small-diameter butterfly valves, referring to... Figure 1 The system includes a worktable 1, a support platform 2, a cantilever mechanism 3, and a pressing actuator 4. The worktable 1 is horizontally positioned, with the support platform 2 located on one side of the worktable 1. The cantilever mechanism 3 includes a column 31 and a cantilever beam 32. The column 31 is vertically mounted on the support platform 2 and rotatably connected to it. The cantilever beam 32 is horizontally oriented, with one end connected to the upper end of the column 31 and the other end extending directly above the worktable 1. The pressing actuator 4 includes a hydraulic cylinder 41 and a fluid supply assembly. The fluid supply assembly is connected to the hydraulic cylinder 41, which is vertically positioned directly above the worktable 1. The end of the cantilever beam 32 furthest from the column 31 along its length is connected to the hydraulic cylinder 41. A pressing column 42 is vertically mounted at the lower end of the hydraulic cylinder 41 and coaxially connected to the drive end of the hydraulic cylinder 41.

[0053] In this embodiment, refer to Figure 1To further improve the stability of the cantilever mechanism 3, a diagonal brace 33 is provided between the column 31 and the cantilever beam 32. One end of the diagonal brace 33 is connected to the cantilever beam 32, and the other end is connected to the column 31. The diagonal brace 33, together with the column 31 and the cantilever beam 32, forms a stable triangular support structure. When the hydraulic cylinder 41 outputs a huge thrust downwards, the cantilever beam 32 will be subjected to a reverse bending moment. The diagonal brace 33 can effectively share the force of the cantilever beam 32, preventing the cantilever beam 32 from undergoing elastic deformation or permanent deformation due to excessive force, thereby ensuring the verticality of the pressing trajectory of the pressing column 42.

[0054] In this embodiment, refer to Figure 1 The main bodies of both the workbench 1 and the support platform 2 are assembled using aluminum profiles. The workbench 1 and support platform 2 can be set up independently or connected as a whole. This aluminum profile assembly design not only effectively reduces the overall weight of the device, facilitating equipment handling and layout adjustments, but also allows for the addition of auxiliary accessories or structural expansion through the grooved structure on the aluminum profile surface, thus reducing manufacturing costs.

[0055] In this embodiment, refer to Figure 1 No clamps for clamping the valve body are provided on workbench 1. Therefore, during the press-fitting of the valve shaft, the valve body is placed directly on the table surface of workbench 1, and the operator can assist in centering by hand. This clamp-free design is simple in structure and can reduce clamping time and improve work efficiency for small-batch, non-standard or temporary assembly tasks.

[0056] In this embodiment, refer to Figure 1 A central column is vertically mounted on the support platform 2, and the central column is fixedly connected to the support platform 2. A column 31 is coaxially sleeved on the outside of the central column, and the column 31 and the central column are connected by a bearing, thus achieving a rotatable connection between the column 31 and the support platform 2. This allows the cantilever beam 32 and the hydraulic cylinder 41 to be moved away from above the worktable 1 by rotation, facilitating the placement of the valve body on the worktable 1 and preventing interference between the valve body and the installation auxiliary devices.

[0057] In this embodiment, refer to Figure 1 The fluid supply assembly uses a 10T hydraulic station, and is connected to the hydraulic cylinder 41 via oil pipes to provide power. The 10T hydraulic station provides continuous and stable axial thrust, which, compared to pneumatic or manual devices, can reliably and continuously overcome the interference fit friction between the rubber valve seat and the valve shaft, ensuring smooth valve shaft insertion and preventing jamming or impact due to insufficient pressure.

[0058] The implementation principle of this application embodiment is as follows: When assembling the valve shaft, the worker first pushes the cantilever beam 32 away, causing the column 31 to rotate, thereby removing the cantilever beam 32 and the hydraulic cylinder 41 from above the workbench 1. Then, the valve body is moved onto the workbench 1, and one end of the valve shaft is inserted into the valve body. Afterwards, the cantilever beam 32 is pulled back, aligning the crimping column 42 with the valve shaft. Finally, the fluid supply assembly is controlled via remote control or a manual button, thereby activating the hydraulic cylinder 41. The hydraulic cylinder 41 drives the crimping column 42 to move vertically downward at a uniform speed, thereby pressing the corresponding valve shaft into the valve body at a uniform speed, completing the installation of the valve shaft.

[0059] Example 2: An auxiliary device for installing small-diameter butterfly valves, referring to... Figure 2 and Figure 3 The difference between this embodiment and embodiment 1 is that: a clamp assembly 11 is provided on the workbench 1. The clamp assembly 11 includes a base 111. The base 111 is connected to the workbench 1 by bolts. The length direction of the base 111 is perpendicular to the length direction of the cantilever beam 32.

[0060] A bidirectional lead screw 112 is rotatably mounted on the base 111. The bidirectional lead screw 112 is axially arranged along the length of the base 111, and a drive handwheel 113 is coaxially connected to one end of the bidirectional lead screw 112. The drive handwheel 113 is located outside the base 111. Two V-shaped grippers 114 are provided on the base 111. The two V-shaped grippers 114 are arranged opposite each other along the length of the base 111 and are slidably connected to the base 111 along the length of the base 111. The two V-shaped grippers 114 are respectively threaded onto the reverse threads at both ends of the bidirectional lead screw 112.

[0061] The implementation principle of this embodiment is as follows: With the clamp assembly 11 in place, rotating the drive handwheel 113 drives the two V-shaped grippers 114 to synchronously move towards or separate from the center via the bidirectional lead screw 112. Therefore, during valve shaft assembly, the clamp assembly 11 can automatically center and clamp the valve body placed on the worktable 1, ensuring that the valve body does not shift during press-fitting and guaranteeing stability and positioning accuracy during valve body assembly.

[0062] Example 3: An auxiliary device for installing small-diameter butterfly valves, referring to... Figure 4 The difference between this embodiment and Embodiment 1 is that: (Refer to...) Figure 4 The cantilever beam 32 is slidably connected to the column 31 in the vertical direction, and a first adjustment and locking mechanism 5 is provided between the cantilever beam 32 and the column 31.

[0063] Reference Figure 4 Specifically, a connecting sleeve 321 is fixed to one end of the cantilever beam 32 facing the column 31. The connecting sleeve 321 is coaxially sleeved on the outside of the column 31, and the connecting sleeve 321 is slidably connected to the column 31 in the vertical direction.

[0064] Reference Figure 4 The first adjusting and locking mechanism 5 includes a first locking pin 51. The column 31 has several first positioning holes 52, which are arranged at intervals along the vertical direction. The connecting sleeve 321 has a first through hole 53. When the connecting sleeve 321 slides vertically against the column 31, the first through hole 53 sequentially connects with all the first positioning holes 52. When a first positioning hole 52 is directly connected to a first through hole 53, the first locking pin 51 is coaxially inserted into the first through hole 53 and the corresponding first positioning hole 52. At this time, the first locking pin 51 fixes the connecting sleeve 321 to the column 31, thereby fixing the cantilever beam 32 to the column 31, thus achieving graded height adjustment of the cantilever beam 32 on the column 31.

[0065] Reference Figure 4 and Figure 5 Since the column 31 is sleeved onto the central column of the support platform 2, the first locking pin 51 cannot penetrate the central column. Therefore, a set of first adjusting locking mechanisms 5 is provided on both opposite sides of the column 31. With the cooperation of the two sets of first adjusting locking mechanisms 5, the stability of the connection sleeve 321 and the column 31 can be improved.

[0066] Reference Figure 4 and Figure 5 The hydraulic cylinder 41 is slidably connected to the cantilever beam 32 in the vertical direction, and a second adjustment and locking mechanism 6 is provided between the hydraulic cylinder 41 and the cantilever beam 32.

[0067] Reference Figure 4 and Figure 5 Specifically, a vertical slide 322 is provided at the end of the cantilever beam 32 away from the connecting sleeve 321 along its own length direction, and the vertical slide 322 is fixedly connected to the cantilever beam 32. A mounting seat 43 is provided on the hydraulic cylinder 41, and the mounting seat 43 is slidably connected to the vertical slide 322 in the vertical direction.

[0068] Reference Figure 5 and Figure 6The second adjusting and locking mechanism 6 includes a second locking pin 61. A plurality of second positioning holes 62 are provided on the mounting base 43, spaced apart vertically. A second through hole 63 is provided on the vertical slide 322. When the mounting base 43 slides vertically against the vertical slide 322, the second through hole 63 sequentially connects with all the second positioning holes 62. When a second positioning hole 62 is directly connected to a second through hole 63, the second locking pin 61 is coaxially inserted into the second through hole 63 and the corresponding second positioning hole 62. At this time, the second locking pin 61 fixes the mounting base 43 to the vertical slide 322, thereby fixing the cantilever beam 32 to the hydraulic cylinder 41, thus achieving graded height adjustment of the hydraulic cylinder 41 on the cantilever.

[0069] With the above design in place, referring to Figure 4 and Figure 5 By sliding and adjusting the height of the cantilever beam 32, the range of butterfly valve specifications that the installation auxiliary device can be coarsely adjusted. By sliding and adjusting the height of the hydraulic cylinder 41, the range of butterfly valve specifications that the installation auxiliary device can be finely adjusted.

[0070] Specifically, refer to Figure 4 and Figure 5 In this embodiment, butterfly valves of different specifications are divided into three large sections, each with four positions. Correspondingly, each large section has a first positioning hole 52 on the column 31. When the first locking pin 51 is inserted into the corresponding first positioning hole 52, the cantilever mechanism 3 is positioned within the corresponding large section. Furthermore, each position corresponds to a second positioning hole 62. When the second locking pin 61 is inserted into the corresponding second positioning hole 62, the hydraulic cylinder 41 is positioned within the corresponding position. Therefore, with three sections and four positions in each section, the final installation auxiliary device can be adapted to the assembly of twelve different butterfly valve specifications.

[0071] For example, in this embodiment, the butterfly valve specifications from DN50 to DN600 are divided into three major ranges: small diameter range (DN50-DN200), medium diameter range (DN250-DN400), and large diameter range (DN450-DN600). Correspondingly, the butterfly valve specifications suitable for the small diameter range are DN50, DN100, DN150, and DN200; similarly, the butterfly valve specifications suitable for the medium diameter range are DN250, DN300, DN350, and DN400; and the butterfly valve specifications suitable for the large diameter range are DN450, DN500, DN550, and DN600. Therefore, each large interval corresponds to four specifications, thus setting four levels for the sliding adjustment between the hydraulic cylinder 41 and the cantilever beam 32. From bottom to top, the first level corresponds to DN50, DN250, and DN450; the second level corresponds to DN100, DN300, and DN500; the third level corresponds to DN150, DN350, and DN550; and the fourth level corresponds to DN200, DN400, and DN600.

[0072] Therefore, when assembling a DN150 butterfly valve, since DN150 belongs to the small diameter range, the cantilever beam 32 is first slidably adjusted to be in the position corresponding to the small diameter range and locked; then, the hydraulic cylinder 41 is slidably adjusted to be in the third position corresponding to the DN150 specification size and locked.

[0073] With this two-stage adjustment design, the effective stroke range of the hydraulic cylinder 41 can be matched with the press-fitting path required by the valve shaft of the current specification, which avoids both insufficient stroke caused by excessive adjustment range and spatial interference caused by excessive stroke.

[0074] Specifically, the principle behind this design is as follows: (Refer to...) Figure 4 and Figure 5 Because the cantilever mechanism 3 has a large structure and heavy overall weight, it experiences significant resistance during adjustment and is difficult to achieve high-precision adjustments. Therefore, it is mainly suitable for large-span size adjustments (i.e., coarse adjustments) for valves of different diameters. However, through the sliding adjustment between the cantilever beam 32 and the hydraulic cylinder 41, and the coordinated design of the second adjustment locking mechanism 6, the vertical height of the hydraulic cylinder 41 is adjustable. Since the hydraulic cylinder 41 is smaller and lighter than the cantilever mechanism 3, this reduces the difficulty of operation and makes it easier to perform small-size precise adjustments (i.e., fine adjustments).

[0075] Furthermore, this coarse adjustment combined with fine adjustment mode is essentially based on the principle of superimposed compensation of the baseline and incremental values ​​for the height variation of butterfly valves of different specifications. Since the height of butterfly valves of different specifications (DN50-DN600) usually increases in a step-like manner with the increase of the diameter, this application uses the height adjustment of the cantilever beam 32 to provide large-span baseline compensation and the height adjustment of the hydraulic cylinder 41 to provide small-span incremental compensation. Specifically, the distance between two adjacent first positioning holes 52 on the column 31 is designed to be equal to the height difference between the corresponding starting specifications of two adjacent large intervals (e.g., DN50 and DN250, or DN250 and DN450); while the distance between two adjacent second positioning holes 62 on the vertical slide 322 is designed to be equal to the height difference between two adjacent specifications within the same large interval (e.g., DN50 and DN100, or DN100 and DN150).

[0076] By combining large and small step adjustments, the enormous height span originally required to cover DN50 to DN600 is broken down into pre-positioned mechanical structures. Regardless of the butterfly valve specifications, by selecting a specific combination of the first positioning hole 52 and the second positioning hole 62, the initial position of the hydraulic cylinder 41 can be physically moved and locked at the optimal press-fit starting point above the valve shaft (maintaining both a safe distance and within the effective stroke). This allows the hydraulic cylinder 41 to meet the press-fit requirements of all specifications with only a short fixed working stroke, avoiding the problems of high cost, large size, and poor rigidity associated with custom-made ultra-long stroke cylinders, thereby improving the versatility and economy of the equipment.

[0077] Reference Figure 6 and Figure 7 The pressing column 42 includes a fixed column 421, a flexible buffer 422, and an actuating column 423. The fixed column 421 and the actuating column 423 are coaxially arranged and both are vertically arranged. The fixed column 421 is located above the actuating column 423. The flexible buffer 422 is located vertically between the fixed column 421 and the actuating column 423. The fixed column 421, the flexible buffer 422, and the actuating column 423 are connected in sequence. The upper end of the fixed column 421 is coaxially and detachably connected to the driving end of the hydraulic cylinder 41.

[0078] Reference Figure 7 and Figure 8 The flexible buffer 422 includes a sleeve 4221, a sliding column 4222, and a buffer spring 4223. The sleeve 4221 is axially arranged in the vertical direction. The sliding column 4222 is coaxially inserted into the sleeve 4221 and slidably connected to the inner wall of the sleeve 4221. The buffer spring 4223 is coaxially arranged in the sleeve 4221. One end of the buffer spring 4223 is connected to the top surface of the inner wall of the sleeve 4221, and the other end is connected to the top surface of the sliding column 4222. The buffer spring 4223 is in a compressed state.

[0079] Reference Figure 8 The lower end of the fixed column 421 is coaxially and detachably connected to the upper end of the sleeve 4221, and the upper end of the sliding column 4222 is coaxially and detachably connected to the upper end of the actuating column 423, with the actuating column 423 located outside the sleeve 4221.

[0080] In this embodiment, the fixed column 421 and the sleeve 4221, as well as the fixed column 421 and the drive end of the hydraulic cylinder 41, are connected by bolts, and the actuator 423 and the sliding column 4222 are connected by threads.

[0081] Based on the flexible buffer 422, and utilizing the elastic force of the pre-compressed buffer spring 4223, during the normal pressing of the valve shaft, the reaction force of the valve shaft on the pressing column 42 is less than the elastic force of the buffer spring 4223 in a compressed state. The sliding column 4222 and the sleeve 4221 remain relatively stationary. At this time, the flexible buffer 422 exhibits rigid transmission, ensuring normal valve shaft pressing. When the valve shaft is installed in place or encounters abnormal resistance, the fixed column 421 and the corresponding sliding column 4222 stop moving, while the fixed column 421 and the corresponding sleeve 4221, driven by the hydraulic cylinder 41, continue to move downwards, forcing the buffer spring 4223 to undergo further compression. At this time, the flexible buffer 422 exhibits flexibility. This design can absorb excess stroke kinetic energy of the hydraulic cylinder 41, effectively preventing scratches or crush damage to the rubber valve seat and valve shaft caused by rigid overshoot.

[0082] Reference Figure 4 and Figure 6 The hydraulic cylinder 41 is also equipped with a follow-up hard limit mechanism 7, which includes a hard limit component 71. The hard limit component 71 includes a mounting rod 711, a limit plate 712, an adjustment drive component 713, and an adjustment controller. The mounting rod 711 is vertically arranged, and its upper end is connected to the hydraulic cylinder 41, while its lower end extends towards the worktable 1. The mounting rod 711 is equipped with an adjustment drive component 713, which is electrically connected to the adjustment controller. The adjustment drive component 713 is vertically arranged, and its drive end is connected to the limit plate 712. The limit plate 712 is horizontally arranged and located below the mounting rod 711.

[0083] Based on the design of the hard limit component 71, when the height of the hydraulic cylinder 41 is adjusted by the second adjustment and locking mechanism 6, the mounting rod 711 and the limit plate 712 will move synchronously with the hydraulic cylinder 41, which realizes the follow-up function and eliminates the need to recalibrate the reference zero point of the limit after adjusting the height of the hydraulic cylinder 41.

[0084] Reference Figure 6 and Figure 7The follow-up hard limit mechanism 7 also includes an anti-impact plate 714, which is horizontally arranged and one end of the anti-impact plate 714 is connected to the fixed post 421. The anti-impact plate 714 is located above the limit plate 712, and the anti-impact plate 714 and the limit plate 712 are directly opposite each other in the vertical direction.

[0085] Based on the coordinated arrangement of the anti-impact plate 714 and the limiting plate 712, during the valve shaft press-fitting process, the anti-impact plate 714 descends synchronously with the fixed column 421. When the valve shaft is press-fitted in place and the buffer spring 4223 is compressed by a preset distance, the anti-impact plate 714 will physically contact and press against the limiting plate 712. At this time, the limiting plate 712 limits the pressing column 42, forcibly preventing the fixed column 421 from continuing to descend. This hard limiting design provides a final safety barrier, ensuring that even if the liquid supply component malfunctions or there is residual pressure, the valve shaft will not be excessively pressed down, damaging the valve body or rubber seals.

[0086] Reference Figure 4 and Figure 6 The follow-up hard limit mechanism 7 also includes a soft limit component 72, which includes a limit sensor 721 and a soft limit controller. The limit sensor 721 is located below the limit plate 712 and is connected to the limit plate 712. The limit sensor 721 is vertically arranged, and its detection end is positioned directly opposite the anti-impact plate 714 through a corresponding through hole on the limit plate 712. The limit sensor 721, the soft limit controller, and the liquid supply component are electrically connected in sequence.

[0087] Based on the setting of limit sensor 721 and soft limit controller, limit sensor 721 detects the position of anti-impact plate 714 in real time and thus controls the operation of liquid supply assembly. Specifically: In the initial stage of the descent of the crimping column 42, the limit sensor 721 detects that the distance between the anti-impact plate 714 and the limit plate 712 is much greater than the preset safety threshold. At this time, the soft limit controller instructs the liquid supply component to supply oil at a higher flow rate, driving the hydraulic cylinder 41 to accelerate downward so that the crimping column 42 can quickly approach the valve shaft, thereby improving the assembly efficiency. During the valve shaft pressing process, as the anti-impact plate 714 gradually approaches the limit plate 712, the limit sensor 721 provides real-time feedback of distance data. The soft limit controller can control the liquid supply component to maintain a stable output, thereby achieving constant pressure and smooth advancement and ensuring the pressing quality.

[0088] When the crimping column 42 is in the final stage of descent, just before the anti-impact plate 714 is about to contact the limit plate 712 (e.g., when the distance is 1-2mm), it indicates that the valve shaft has been installed in place and the buffer spring 4223 has generated a preset compression amount. The limit sensor 721 detects the anti-impact plate 714 in place signal. The soft limit controller is triggered before the physical impact, controlling the liquid supply component to decelerate to prevent inertial overshoot, and finally cutting off the liquid supply or unloading, so that the hydraulic cylinder 41 stops moving.

[0089] Through this soft-limit control logic, the hydraulic inertia is used to complete the final minute stroke, which not only achieves a soft landing and avoids the hard limit component 71 from being subjected to frequent and violent impacts, thus extending the mechanical life, but also serves as a double insurance for stroke control, realizing a safety protection mechanism that combines soft landing and hard locking.

[0090] Reference Figure 4 and Figure 6 The follow-up hard limit mechanism 7 also includes a positioning detection component 73, which includes a positioning controller and two distance sensors 731, which are mounted on the hydraulic cylinder 41.

[0091] Reference Figure 6 and Figure 7 Both the fixed column 421 and the actuating column 423 are equipped with target plates 732, which are spaced apart circumferentially along the fixed column 421. A ranging sensor 731 is vertically mounted, and each ranging sensor 731 corresponds to one of the target plates 732, with the detection end of the ranging sensor 731 facing the corresponding target plate 732 vertically. Both ranging sensors 731 are electrically connected to the positioning controller, which is in turn electrically connected to the liquid supply assembly.

[0092] With the cooperation of the in-place detection component 73, differential detection of the crimping post 42 is achieved, thereby enabling real-time monitoring of the working status of the crimping post 42. Specifically: Normal pressing stage: When the displacement changes of the two distance sensors 731 are consistent, it indicates that the sliding column 4222 and the sleeve 4221 are relatively stationary, the buffer spring 4223 is not compressed, and the pressing column 42 is in a normal rigid pressing state.

[0093] Positioning and buffering phase: When the value of one ranging sensor 731 stops changing while the value of the other ranging sensor 731 continues to increase, this indicates that the valve shaft has reached the bottom, and the buffer spring 4223 begins to compress. Therefore, by comparing the real-time data of the two ranging sensors 731, the positioning controller can identify the moment when the valve shaft reaches the bottom and determine whether the pressing is qualified or if abnormal jamming has occurred. This achieves intelligent closed-loop control of the pressing process.

[0094] Reference Figure 6Both the limit controller and the positioning controller are electrically connected to the regulating controller. Under this design, before each pressing task begins, the regulating controller controls the regulating drive 713 to move the limit plate 712 to the initial position according to preset parameters; during the pressing process, each sensor provides real-time feedback on its status, and the position of the limit plate 712 is corrected or active protection is triggered through communication between the limit controller, the positioning controller, and the regulating controller.

[0095] Reference Figure 6 In this embodiment, the regulating controller, soft limit controller, and positioning controller all use the same industrial-grade PLC. Alternatively, the regulating controller, soft limit controller, and positioning controller can be three independent PLCs connected for communication. The fluid supply assembly uses a servo hydraulic station and is equipped with electro-hydraulic proportional valves, namely proportional flow valves and proportional pressure valves. Compared to ordinary electromagnetic directional valves, the proportional valves can linearly and continuously adjust the hydraulic oil flow and pressure based on the 0-10V or 4-20mA analog signal output by the PLC, thereby achieving the aforementioned smooth variable thrust control. The ranging sensor 731 is a high-precision laser displacement sensor with a repeatability accuracy of 0.01mm or higher to ensure that it can accurately detect the minute compression deformation of the buffer spring 4223. The soft limit sensor 721 is an analog output inductive proximity sensor or a short-range laser ranging sensor 731, which needs to output continuous distance voltage / current signals so that the PLC can perform segmented speed control based on the real-time distance value, rather than just providing a switching signal. The adjustment drive 713 is a servo electric cylinder or a linear module with encoder feedback. With the closed-loop control of the PLC, it can realize the micron-level position adjustment of the limit plate 712 in the vertical direction to meet the stringent accuracy requirements of adaptive iterative optimization.

[0096] The implementation principle of this application embodiment is as follows: The operator first adjusts the installation auxiliary device according to the specific diameter specifications of the butterfly valve to be assembled. Specifically: First, the first adjustment and locking mechanism 5 is used to lock the cantilever beam 32 at the coarse adjustment height corresponding to the column 31, and the cantilever beam 32 is adjusted to the corresponding large range; then, the second adjustment and locking mechanism 6 is used to lock the hydraulic cylinder 41 at the corresponding position. At this time, the hydraulic cylinder 41 is located at the optimal initial pressing height above the valve shaft, ensuring that the stroke of the hydraulic cylinder 41 can completely cover the pressing depth of the valve shaft without excessive ineffective idle stroke.

[0097] Place the valve body on workbench 1, activate the installation auxiliary device, and assemble the valve shaft. At this time, the soft limit component 72 takes over control, and the limit sensor 721 monitors the relative distance between the anti-impact plate 714 and the limit plate 712 in real time, and guides the liquid supply component to perform the following segmented control: Accelerated approach: During the initial downward phase, due to the long distance, the soft limit controller commands the liquid supply component to output a high flow rate, driving the hydraulic cylinder 41 to descend quickly to shorten the idle stroke time. Constant pressure pressing: When the pressing column 42 contacts the valve shaft and begins to press in, the soft limit controller adjusts to a constant working pressure output to ensure that the valve shaft is inserted into the valve body smoothly and at a uniform speed; Deceleration to position: When the anti-impact plate 714 moves to the preset warning area of ​​the limit plate 712 (e.g., 2mm remaining stroke), the limit sensor 721 triggers a signal, and the soft limit controller instructs the hydraulic cylinder 41 to automatically decelerate until it stops, preventing subsequent hard impacts due to excessive inertia.

[0098] Throughout the entire valve shaft assembly process described above, the positioning detection component 73 operates continuously. Two distance sensors 731 monitor the displacement of the fixed column 421 and the actuating column 423, and the positioning controller calculates the difference between the two in real time. When the difference remains constant, it is determined to be a rigid transmission, and the valve shaft is being pressed in normally; When the actuator 423 stops moving (i.e., the valve shaft reaches the bottom), while the stationary column 421 continues to descend slightly, causing a change in the difference between the two, i.e., the buffer spring 4223 begins to compress, the positioning controller determines that the valve shaft is 100% in position. Once the compression of the buffer spring 4223 reaches a preset threshold (e.g., 0.5mm), the positioning controller immediately sends a stop signal, cuts off the liquid supply component output, and automatically returns to its original position.

[0099] During the entire valve shaft assembly process, if the hydraulic cylinder 41 fails to stop in time, as the hydraulic cylinder 41 continues to descend, the anti-impact plate 714 will physically impact and press against the limit plate 712. At this time, the rigid block between the anti-impact plate 714 and the limit plate 712 will forcibly cut off the remaining stroke of the hydraulic cylinder 41, thereby ensuring at the physical level that the crimping column 42 will never crush the valve body or damage the rubber seals, thus completely eliminating the risk of overshoot.

[0100] During the assembly of butterfly valves of the same specifications in batches, the soft limit controller performs adaptive iterative optimization from safety redundancy to precise limit using the adjustment drive component 713 set on the mounting rod 711. In the initial stages of the first piece or batch, the regulating controller controls the regulating drive 713 to lower the position of the limit plate 712, reserving a large initial safety margin. This ensures that even if there is a positive tolerance in the valve body height, the limit plate 712 will not affect the valve shaft press-fitting. Subsequently, based on the actual data fed back by the positioning detection component 73, if the regulating controller finds that the hydraulic cylinder 41 still needs a long stroke to touch the limit plate 712 after the valve shaft is in place, indicating an ineffective excessive buffer, the regulating controller instructs the regulating drive 713 to drive the limit plate 712 upwards slightly, gradually reducing the safety margin. Finally, the limit plate 712 is adjusted to its extreme position, where only a 0.5mm buffer is allowed before it touches the limit plate 712 after the valve shaft is in place. Through this dynamic fine-tuning, not only can small tolerance fluctuations in the height of valve bodies within the same batch be automatically compensated, but also redundant strokes in a single press-fitting can be minimized while ensuring safety, thereby improving the consistency and cycle time of batch production.

[0101] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. An auxiliary device for installing small-diameter butterfly valves, characterized in that, include: The workbench (1) is used to support or fix the valve body; A support platform (2) is located on one side of the workbench (1); The cantilever mechanism (3) includes a column (31) and a cantilever beam (32). The column (31) is vertically mounted on the support platform (2) and is rotatably connected to the support platform (2). The cantilever beam (32) is horizontally mounted. One end of the cantilever beam (32) is connected to the upper end of the column (31), and the other end extends to the top of the workbench (1). The crimping actuator (4) includes a hydraulic cylinder (41) and a liquid supply assembly. The liquid supply assembly is connected to the hydraulic cylinder (41). The hydraulic cylinder (41) is vertically arranged and located directly above the workbench (1). The hydraulic cylinder (41) is connected to the cantilever beam (32). A crimping column (42) is vertically arranged at the lower end of the hydraulic cylinder (41). The crimping column (42) is connected to the drive end of the hydraulic cylinder (41).

2. The auxiliary device for installing a small-diameter butterfly valve according to claim 1, characterized in that, A diagonal brace (33) is provided between the column (31) and the cantilever beam (32). One end of the diagonal brace (33) is connected to the cantilever beam (32), and the other end is connected to the column (31).

3. The auxiliary device for installing a small-diameter butterfly valve according to claim 1, characterized in that, The cantilever beam (32) is slidably connected to the column (31) in the vertical direction, and a first adjustment and locking mechanism (5) is provided between the cantilever beam (32) and the column (31). The first adjustment and locking mechanism (5) is used to lock the cantilever beam (32) and the column (31).

4. The auxiliary device for installing a small-diameter butterfly valve according to claim 3, characterized in that, A connecting sleeve (321) is fixedly connected to one end of the cantilever beam (32) facing the column (31). The connecting sleeve (321) is coaxially sleeved on the outside of the column (31), and the connecting sleeve (321) is slidably connected to the column (31) in the vertical direction. The first adjustment and locking mechanism (5) includes a first locking pin (51). A plurality of first positioning holes (52) are sequentially spaced along the vertical direction on the column (31). A first through hole (53) is provided on the connecting sleeve (321). The first positioning hole (52) and the first through hole (53) are coaxially connected. The first locking pin (51) is coaxially inserted into the first through hole (53) and the corresponding first positioning hole (52).

5. The auxiliary device for installing a small-diameter butterfly valve according to claim 3, characterized in that, The hydraulic cylinder (41) is slidably connected to the cantilever beam (32) in the vertical direction, and a second adjustment and locking mechanism (6) is provided between the cantilever beam (32) and the hydraulic cylinder (41). The second adjustment and locking mechanism (6) is used to lock the cantilever beam (32) and the hydraulic cylinder (41).

6. The auxiliary device for installing a small-diameter butterfly valve according to claim 1, characterized in that, The crimping post (42) includes a fixed post (421), a flexible buffer (422), and an actuating post (423). The flexible buffer (422) includes a sleeve (4221), a sliding column (4222), and a buffer spring (4223). The sleeve (4221) is coaxially sleeved on the outside of the sliding column (4222). The sleeve (4221) is slidably connected to the sliding column (4222) along its own axial direction. The buffer spring (4223) is coaxially disposed inside the sleeve (4221). One end of the buffer spring (4223) is connected to the sleeve (4221), and the other end is connected to the sliding column (4222). The buffer spring (4223) is in a compressed state. One end of the fixed column (421) is coaxially connected to the sleeve (4221), and the other end is coaxially connected to the drive end of the hydraulic cylinder (41). One end of the actuating column (423) is coaxially connected to the sliding column (4222).

7. The auxiliary device for installing a small-diameter butterfly valve according to claim 6, characterized in that, The fixed column (421) is detachably connected to the sleeve (4221) and the driving end of the hydraulic cylinder (41), and the actuating column (423) is detachably connected to the sliding column (4222).

8. The auxiliary device for installing a small-diameter butterfly valve according to claim 6, characterized in that, It also includes a positioning detection component (73), which includes a positioning controller and two ranging sensors (731), which are mounted on the hydraulic cylinder (41) and are vertically mounted. A target plate (732) is provided on both the fixed column (421) and the execution column (423). The distance sensor (731) is provided in a one-to-one correspondence with the target plate (732). The detection end of the distance sensor (731) is directly opposite to the target plate (732) in the vertical direction. Both of the ranging sensors (731) and the liquid supply assembly are electrically connected to the positioning controller.

9. An auxiliary device for installing a small-diameter butterfly valve according to claim 6, characterized in that, It also includes a hard limiting component (71), which includes a mounting rod (711) and a limiting plate (712). The mounting rod (711) is vertically arranged, and the upper end of the mounting rod (711) is connected to the hydraulic cylinder (41). The lower end of the mounting rod (711) is connected to the limiting plate (712), and the limiting plate (712) is horizontally arranged. An anti-impact plate (714) is provided on the fixed column (421). The anti-impact plate (714) is horizontally arranged and located directly above the limiting plate (712). The limiting plate (712) and the anti-impact plate (714) are arranged directly opposite each other in the vertical direction.

10. An auxiliary device for installing a small-diameter butterfly valve according to claim 9, characterized in that, It also includes a soft limit component (72), which includes a soft limit controller and a limit sensor (721). The limit sensor (721) is located below the limit plate (712) and connected to the limit plate (712). The limit sensor (721) is vertically arranged and its detection end is set facing the anti-impact plate (714). The limit sensor (721) and the liquid supply component are both electrically connected to the soft limit controller.

Images