Valve drive head bracket bottom hole processing method and clamp auxiliary device

Abstract

The present application provides a method for processing the bottom hole of a valve drive head bracket and a clamp auxiliary device. The method includes: using an offline spare valve drive head with the same structural dimensions to determine a first marking line and a second marking line on the clamp auxiliary device; conveniently placing the marked device on an online valve drive head with a complex and special on-site spatial layout; adjusting each adjustment member according to the first marking line so that the top surface of the mounting seat is parallel to the cross-section of the circumferential side of the drive head; installing an electric magnetic drill on the mounting seat according to the second marking line on the mounting seat so that the drill bit extension line of the electric magnetic drill is along the direction of the radial center axis of the spring seat of the drive head; starting the electric magnetic drill to perform a drilling operation on the spring seat on the drive head. The present application ensures that when the electric magnetic drill is installed on the online valve drive head, the drilling center line is along the direction of the radial center axis of the spring seat of the online valve drive head.

Description

Technical Field

[0001] The present application belongs to the technical field of steam turbine units, and in particular relates to a method for machining a bottom hole of a valve drive head bracket and a clamp auxiliary device. Background Art

[0002] Typically, a full-speed steam turbine unit is designed with 12 reheat inlet valves installed. Each valve is equipped with a hydraulic drive head 1 to drive the valve's opening and closing motion. The drive head 1 is cylindrical in structure. Due to the installation position of the reheat inlet valve, the drive head 1 is installed at an upward tilt, with the axial direction of the drive head 1 forming an approximately 45-degree angle with the horizontal direction of the ground (Note: the angle varies significantly for each valve). The on-site spatial layout is complex and unique.

[0003] The main components of the drive head 1 are the oil motor 11 (oil cylinder + piston rod), the cylindrical body 12, the spring seat 13, the spring assembly 14, the guide rod 15, the cylindrical body base 16, etc. Figure 1 The drive head 1 is cylindrical as a whole. The piston rod of the oil motor 11 at the top is connected to the spring seat 13 through threads. The internal guide rod 15 is connected to the spring seat 13 through threads. The spring seat 13 is arranged concentrically with the cylindrical body 12. When the oil pressure inside the oil cylinder of the oil motor 11 increases, the piston rod drives the spring seat 13 to compress the spring assembly 14, driving the internal guide rod 15 to extend linearly; when the oil pressure inside the oil cylinder of the oil motor 11 drops, the compressed spring assembly 14 pushes the spring seat 13 and the piston rod to move in the opposite direction, driving the internal guide rod 15 to retract linearly. Since the lower end of the guide rod 15 is connected to the valve shaft of the valve, the opening and closing movement of the valve can be realized.

[0004] Because each actuator head has an opening 121 on its circumference, a displacement measurement bracket is installed on the spring seat 13 of each actuator head 1. The bracket reciprocates with the valve's opening and closing motion, and the bracket's displacement can be detected from opening 121, allowing for precise and continuous measurement of the valve's operating stroke. Since the spring seat 13 is cylindrical, installing the bracket requires machining two bottom holes on its outer surface to securely hold the displacement measurement bracket.

[0005] To ensure that the bolts can securely fix the bracket, the center line of the bottom hole must pass through the radial center axis of the cylindrical spring seat 13. Otherwise, the end face will not be able to fully and reliably compact the anti-loosening gasket or bracket when the bolts are tightened. This bottom hole precision requirement cannot be directly processed using a manual electric drill. In addition, the drive head 1 is arranged on site with the axial direction forming an angle of about 45 degrees with the horizontal direction of the ground (Note: the angle of each unit is significantly different). The special spatial arrangement results in the electric magnetic drill that meets the bottom hole processing requirements having no reliable fixing point. Ultimately, the bottom hole of the drive head 1 cannot be processed online. All the accessories such as the connecting oil pipes related to the drive head 1 can only be removed on site, and the drive head 1 can be disassembled and hoisted as a whole, and transported to the machining workshop for offline bottom hole processing of the bracket. After the offline processing is completed, it is returned to the site, hoisted back to install the drive head 1, and the connecting oil pipes and other accessories are restored.

[0006] To summarize, taking a nuclear power plant comprising four units as an example, the use of the above-mentioned offline support bottom hole processing will result in the disassembly and assembly of a large number of important equipment (12 valve drive heads 1 for a single unit, and a nuclear power plant comprising four units, with a total of 48 valve drive heads 1): the number of large equipment lifting times will increase by 96 times; the number of openings of hydraulic oil pipe equipment with very high cleanliness requirements will increase by more than 500 (the average number of oil pipe connection joints for each drive head 1 is about 11), and the number of seal replacements will increase by more than 500 simultaneously; the increased equipment disassembly and assembly work will result in high manpower maintenance investment costs; in addition, the equipment transformation implementation period will be extended, and the extension of the overhaul time for a single day will indirectly result in nearly 10 million in economic losses in power generation. Summary of the Invention

[0007] The purpose of the embodiments of the present application is to provide an online processing method for the bottom hole of a valve drive head bracket and a clamp auxiliary device, so as to solve the technical problem in the prior art that when installing an action displacement measurement bracket on the spring seat of the drive head, the drive head needs to be removed, which is time-consuming, labor-intensive and increases costs.

[0008] To achieve the above objectives, the technical solution adopted in this application is:

[0009] In a first aspect of the present application, a method for machining a bottom hole of a valve drive head bracket is provided, comprising:

[0010] Using an offline spare valve drive head with the same structural dimensions to determine a first marking line and a second marking line on the clamp auxiliary device, wherein the first marking line is marked on an adjusting member of the clamp auxiliary device, and the second marking line is marked on a mounting seat of the clamp auxiliary device;

[0011] Adjusting the adjusting member according to the first marking line to sleeve the marked clamp auxiliary device onto the in-line valve drive head;

[0012] Installing the electric magnetic drill on the mounting base according to the second marking line;

[0013] The electric magnetic drill is started to perform a drilling operation on the spring seat on the in-line valve drive head.

[0014] Optionally, when the adjusting member is adjusted according to the first marking line so that the clamp auxiliary device is fixed on the online valve driving head, the top surface of the mounting seat is parallel to the cross-section of the circumferential side surface of the online valve driving head;

[0015] And / or, by utilizing the characteristic that the suction cup of the electric magnetic drill base and its drill bit are perpendicular to each other, when the electric magnetic drill is installed on the mounting base through the second marking line, the drill bit extension line of the electric magnetic drill is along the radial center axis direction of the online valve drive head spring seat.

[0016] Optionally, the marking method of the first marking line includes:

[0017] Sleeve the clamp auxiliary device onto the horizontally placed spare valve driving head, and adjust the adjusting piece on the clamp auxiliary device so that the top surface of the mounting seat is horizontal when the clamp auxiliary device is fixed on the spare valve driving head;

[0018] Mark each of the adjusting members according to the installation position of each of the adjusting members to form the first marking line.

[0019] Optionally, the marking method for the first marking line further includes:

[0020] Remove the clamp auxiliary device from the spare valve drive head, and then fix the clamp auxiliary device on the spare valve drive head according to the first marking line on each adjusting member;

[0021] Using a level, test and verify whether the top surface of the mounting base is horizontal;

[0022] If so, the first marking line is determined to be reasonable; if not, the first marking line marked on the adjusting member is re-determined.

[0023] Optionally, the step of sleeve-mounting the clamp auxiliary device on the horizontally placed spare valve drive head and adjusting the adjusting member on the clamp auxiliary device so that the top surface of the mounting seat is horizontal when the clamp auxiliary device is fixed on the spare valve drive head comprises:

[0024] First, use a level to adjust the spare valve drive head to a horizontal state in the front-to-back direction and the left-to-right direction;

[0025] Then, the clamp auxiliary device is placed on the horizontally placed spare valve drive head, and the adjustment member on the clamp auxiliary device is adjusted and a level ruler is used to make the top surface of the mounting seat horizontal in the front-to-back direction and the left-to-right direction;

[0026] After the adjustment of the adjusting member is completed, the clamp auxiliary device is fixed to the spare valve driving head.

[0027] Optionally, the marking method of the second marking line includes:

[0028] Adjust the spare valve drive head to be horizontal in the front-to-back and left-to-right directions, and place the clamp auxiliary device on the horizontal spare valve drive head according to the first marking line verified to be reasonable during testing, and confirm that the top surface of the mounting seat is horizontal;

[0029] Use a plumb line to draw a vertical line at the center point of one of the side surfaces of the mounting seat, and mark the position on the circumferential surface of the spring seat of the spare valve drive head that the plumb line points to;

[0030] Placing the electric magnetic drill on the mounting base, and adjusting the position of the electric magnetic drill so that the drill bit of the electric magnetic drill is aligned with the marked point;

[0031] The installation position of the electric magnetic drill base suction cup on the installation base is drawn on the installation base to form the second marking line.

[0032] The second aspect of the present application provides a clamp auxiliary device for realizing the above-mentioned valve drive head bracket bottom hole processing method, wherein the clamp auxiliary device includes an annular body, a first adjusting member, a second adjusting member and a mounting seat, wherein: the annular body includes at least two arc-shaped members, each of the arc-shaped members is arranged in sequence along the circumferential direction, and one adjacent two of the arc-shaped members are detachably connected by the first adjusting member, and the other adjacent two of the arc-shaped members are rotatably connected; the second adjusting member is arranged on the annular body, and the position of the second adjusting member along the radial direction of the annular body is adjustable; the mounting seat is arranged on the annular body for installing an electric magnetic drill.

[0033] Optionally, the mounting seat is in the shape of a flat plate and is arranged tangent to the annular body, and the tangent point between the mounting seat and the annular body is located at the center of the mounting seat.

[0034] Optionally, the first adjusting member is a screw assembly; more than two second adjusting members are provided, and the second adjusting members are adjusting bolts.

[0035] Optionally, three arc-shaped members are provided, namely a first arc-shaped member and two second arc-shaped members, one end of the two second arc-shaped members are rotatably connected to the two ends of the first arc-shaped member respectively, and the other ends of the two second arc-shaped members are detachably connected through the first adjusting member; the thickness of the first arc-shaped member is greater than the thickness of the second arc-shaped member; and / or, the first arc-shaped member is provided with an opening for weight reduction.

[0036] The beneficial effect of the present application is that: in this embodiment, the clamp auxiliary device is first applied to the offline spare valve drive head, and then the position of the adjusting part and the electric magnetic drill on the mounting seat is adjusted so that the extension line of the electric magnetic drill bit can be along the radial center axis direction of the spring seat of the online valve drive head. At this time, the first marking line and the second marking line on the clamp auxiliary device are used to fix the clamp auxiliary device on the online valve drive head according to the first marking line, and the position of the electric magnetic drill on the mounting seat is determined according to the second marking line. When the electric magnetic drill is fixed on the online valve drive head through the clamp auxiliary device, the extension line of the electric magnetic drill bit can be along the radial center axis direction of the spring seat of the online valve drive head, which can ensure that the punching center line is along the radial center axis direction of the spring seat of the online valve drive head, avoiding the need to disassemble the drive head when drilling the drive head, thereby improving the drilling efficiency and saving costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0038] Figure 1 It is a cross-sectional schematic diagram of a drive head in the prior art;

[0039] Figure 2 This is a schematic diagram of the appearance structure of a drive head in the prior art;

[0040] Figure 3 Schematic diagram of the bottom hole machining method for the valve drive head bracket provided in this embodiment;

[0041] Figure 4 A schematic structural diagram of the clamp auxiliary device provided in this embodiment;

[0042] Figure 5 This is a schematic top view of the clamp auxiliary device provided in this embodiment.

[0043] Among them, the reference numerals in the figures are:

[0044] 1-Drive head;

[0045] 11- oil motor; 12- cylindrical body; 13- spring seat; 14- spring assembly; 15- guide rod; 16- cylindrical body base;

[0046] 121- opening;

[0047] 2-Clamp auxiliary device;

[0048] 21-annular body; 22-mounting seat; 23-first adjusting member; 24-second adjusting member;

[0049] 211-first arc-shaped member; 212-second arc-shaped member;

[0050] 2121-arc-shaped segmented part; 2122-hanging ear; 2123-connecting part. DETAILED DESCRIPTION

[0051] To make the purpose, technical solutions and advantages of this application more clear, the following will further describe the implementation methods of this application in detail with reference to the accompanying drawings. The embodiments described with reference to the accompanying drawings are exemplary and are intended to be used to explain this application, and should not be understood as limiting this application.

[0052] In the description of this application, it should be understood that the terms "length", "width", "thickness", "top", "bottom", "inside", "outside", "up", "down", "left", "right", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on this application.

[0053] To facilitate the clear description of the technical solutions of this application, the words "first" and "second" are used to distinguish between identical or similar items with substantially the same functions and effects. Those skilled in the art will understand that the words "first" and "second" do not limit the quantity or order of execution, and the words "first" and "second" do not necessarily mean different.

[0054] In this application, unless otherwise specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, indirect connection through an intermediate medium, internal communication between two components, or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0055] In this application, "and / or" is simply a way to describe the relationship between related objects, indicating that three possible relationships exist. For example, "A and / or B" can mean: A exists alone, A and B exist simultaneously, or B exists alone. Additionally, the character " / " in this document generally indicates that the related objects are in an "or" relationship.

[0056] It should be noted that, in this application, words such as "in one embodiment," "exemplarily," and "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described in this application as "in one embodiment," "exemplarily," or "for example" should not be construed as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "in one embodiment," "exemplarily," and "for example" is intended to present the relevant concepts in a concrete manner.

[0057] With reference to the accompanying drawings, the bottom hole processing method of the valve drive head bracket provided in the embodiment of the present application is now described.

[0058] This embodiment provides a method for machining a bottom hole of a valve drive head bracket, including the following contents:

[0059] Using an offline spare valve drive head with the same structural dimensions, a first marking line and a second marking line are determined on the clamp auxiliary device, wherein the first marking line is marked on the adjustment member of the clamp auxiliary device, and the second marking line is marked on the mounting seat of the clamp auxiliary device;

[0060] Adjust the adjusting member according to the first marking line to sleeve the marked clamp auxiliary device onto the in-line valve drive head;

[0061] Install the electric magnetic drill on the mounting base according to the second marking line;

[0062] Start the electric magnetic drill to drill holes in the spring seat on the online valve drive head.

[0063] This embodiment uses a clamp auxiliary device to fix the electric magnetic drill to the online valve drive head. Considering the complex on-site spatial layout of the online valve drive head, this embodiment first applies the clamp auxiliary device to the offline spare valve drive head, and then adjusts the position of the adjusting piece and the electric magnetic drill on the mounting seat so that the extension line of the electric magnetic drill bit can be along the radial center axis of the spring seat of the online valve drive head. At this time, the first marking line and the second marking line on the clamp auxiliary device are marked. The clamp auxiliary device is fixed to the online valve drive head according to the first marking line, and the position of the electric magnetic drill on the mounting seat is determined according to the second marking line. When the electric magnetic drill is fixed to the online valve drive head through the clamp auxiliary device, the extension line of the electric magnetic drill bit can be along the radial center axis of the spring seat of the online valve drive head, which can ensure that the drilling center line is along the radial center axis of the spring seat of the online valve drive head, avoiding the need to disassemble the drive head when drilling the drive head, improving drilling efficiency and saving costs.

[0064] In one embodiment, by further defining the first marking line and the second marking line, a method for machining a bottom hole of a valve drive head bracket is provided in detail as follows:

[0065] Step S1: using an offline spare valve driving head with the same structural dimensions to determine a first marking line and a second marking line on the clamp auxiliary device 2.

[0066] The offline spare valve actuator head (i.e., the actuator head 1 not in use) is not installed on the reheat inlet valve of the steam turbine unit. When the auxiliary clamp device 2 is installed on the offline spare valve actuator head, the offline spare valve actuator head can be placed horizontally to facilitate marking the first and second marking lines on the auxiliary clamp device 2. Furthermore, "identical structural dimensions" refers to the structural dimensions of the offline spare valve actuator head being identical to those of the online valve actuator head.

[0067] Regarding the clamp assist device 2, it is used to mount the electric magnetic drill on the driver head 1. Specifically, the clamp assist device 2 can be fixed to the driver head 1, and then the electric magnetic drill can be mounted on the clamp assist device 2. The relative position of the electric magnetic drill on the driver head 1 is important, as it determines whether the drill bit's drilling position on the driver head 1's spring seat 13 is aligned with the radial center axis of the spring seat 13 during operation.

[0068] For the specific structure of the drive head 1 mentioned above, please refer to Figure 1 The main components of the drive head 1 are the oil motor 11 (oil cylinder + piston rod), cylindrical body 12, spring seat 13, spring assembly 14, guide rod 15, cylindrical body base 16, etc. The drive head 1 is cylindrical as a whole. Figure 2The cylindrical body 12 of the drive head 1 is provided with an opening 121 through which the spring seat 13 can be seen. The clamp auxiliary device 2 can be fixed to the cylindrical body 12, and then a hole can be drilled on the spring seat 13 at the position of the opening 121 using an electric magnetic drill fixed to the clamp auxiliary device 2.

[0069] Regarding the first marking line and the second marking line, the first marking line is marked on the adjusting piece of the clamp auxiliary device 2 , and the second marking line is marked on the mounting seat 22 of the clamp auxiliary device 2 .

[0070] That is, the clamp auxiliary device 2 includes an adjustment member, which can be used to fasten the clamp auxiliary device 2 to the cylindrical body 12 of the drive head 1. Specifically, the clamp auxiliary device 2 is first mounted on the spare valve drive head, and the adjustment member is adjusted so that the top surface of the mounting seat 22 is parallel to the cross-section of the circumferential side of the spare valve drive head. At this time, a mark is made on the adjustment member to form a first marking line.

[0071] Regarding the second marking line, the electric magnetic drill is installed on the mounting base 22. The electric magnetic drill can be fixed to the mounting base 22 by magnetic attraction so that the drill bit extension line of the electric magnetic drill can be along the direction of the radial center axis of the spring seat of the online valve drive head. At this time, the second marking line is marked on the mounting base 22.

[0072] About electric magnetic excitation drill, electric magnetic excitation drill comprises base, and the drill bit of electric magnetic excitation drill is perpendicular to base. When the base of electric magnetic excitation drill was fixed on the mounting base 22, the drill bit of electric magnetic excitation drill was perpendicular to the mounting base 22.

[0073] See Figure 3 , which is a principle diagram. Figure 3 Two concentric circles are shown in FIG. The inner circle c1 represents the outer circumference of the drive head 1, the outer circle c2 represents the clamp auxiliary device 2, and AB represents the mounting seat 22. The mounting seat 22 is set at the position of the clamp auxiliary device 2 so that OA = OB. A line passing through the midpoint of AB and perpendicular to AB must pass through the origin O ( Figure 3 (The dashed line in the figure represents the radial center axis). Therefore, when the top surface of the mounting seat 22 is parallel to the cross-section of the circumferential side surface of the spare valve drive head, if the drill bit of the electric magnetic drill is positioned at the center of the mounting seat 22, the straight line on which the drill bit of the electric magnetic drill is located can be along the radial center axis of the drive head 1.

[0074] Step S2: Sleeve the marked clamp auxiliary device 2 onto the online valve drive head.

[0075] The online valve drive head has the same structural dimensions but a complex and special on-site spatial layout, that is, the drive head 1 installed on the reheat intake valve and in use. At this time, the drive head 1 is arranged tilted, and the axial direction of the drive head 1 forms an angle of about 45 degrees with the horizontal direction of the ground (Note: the angle of each unit is significantly different).

[0076] Adjust each adjusting piece according to the first marking line so that the clamp auxiliary device 2 is fixed on the online valve driving head, so that the top surface of the mounting seat 22 is parallel to the cross-section of the circumferential side of the online valve driving head; install the electric magnetic drill on the mounting seat 22 according to the second marking line on the mounting seat 22, and utilize the characteristic that the suction cup plane of the electric magnetic drill base and its drill bit are perpendicular to each other to achieve the drill bit extension line of the electric magnetic drill along the direction of the radial center axis of the spring seat of the online valve driving head.

[0077] Step S3: Start the electric magnetic drill to drill a hole in the spring seat 13 on the in-line valve drive head.

[0078] When drilling the spring seat 13, the center line of the drilled hole is along the radial center axis of the spring seat 13. When bolts are subsequently installed in the holes to secure the displacement measuring bracket to the spring seat 13, the bracket can be compacted, which helps to stably secure the displacement measuring bracket to the spring seat 13.

[0079] The bottom hole processing method of the valve drive head bracket provided in this embodiment uses the marked clamp auxiliary device 2 to achieve that when the electric magnetic drill is installed on the online valve drive head, the drill extension line of the electric magnetic drill can be along the direction of the radial center axis of the online valve drive head, which can ensure that the drilling center line is along the direction of the radial center axis of the spring seat of the online valve drive head, avoiding the need to disassemble the drive head when drilling the drive head, thereby improving the drilling efficiency and saving costs.

[0080] In addition, the bottom hole processing method of the valve drive head bracket provided in this embodiment uses the same marked clamp auxiliary device 2 to install an electric magnetic drill operation on each online valve drive head with the same structural size, so as to facilitate the drilling operation of each online valve drive head simply and conveniently, thereby improving the drilling efficiency.

[0081] In one embodiment, the marking method of the first marking line is as follows:

[0082] Step S111: sleeve the clamp auxiliary device 2 onto the horizontally placed spare valve drive head, and adjust the adjustment member 24 on the clamp auxiliary device 2 so that when the clamp auxiliary device 2 is fixed on the spare valve drive head, the top surface of the mounting seat 22 is horizontal.

[0083] In step S111, the following method can be preferably adopted: first, use a spirit level to adjust the spare valve drive head to a horizontal state in the front-to-back direction and the left-to-right direction, then put the clamp auxiliary device 2 on the horizontally placed spare valve drive head, and adjust the adjustment part 24 on the clamp auxiliary device 2, adjust the clamp auxiliary device 2 and use a spirit level to make the top surface of the mounting seat 22 also horizontal in the front-to-back direction and the left-to-right direction; after the adjustment of the adjustment part 24 is completed, the clamp auxiliary device 2 is fixed on the spare valve drive head.

[0084] By adjusting the spare valve drive head and the mounting seat 22 to be level in both the front-back and left-right directions, it is convenient to accurately draw the marking line; the level adjustment is performed using a level ruler, which is easy to operate.

[0085] Step S112: Mark each adjusting member according to the installation position of each adjusting member to form a first marking line.

[0086] Regarding the marking method of the first marking line, in one embodiment, the method further includes a verification process of the first marking line, specifically:

[0087] Remove the clamp auxiliary device 2 from the spare valve drive head, and then fix the clamp auxiliary device 2 on the spare valve drive head according to the first marking line on each adjustment member;

[0088] Use the level again to test and verify whether the top surface of the mounting base 22 is horizontal;

[0089] If so, the first marking line is determined to be reasonable; if not, the first marking line marked on the adjusting member is re-determined.

[0090] In this embodiment, the accuracy of marking of the first marking line is increased by adding a verification process for the first marking line.

[0091] Based on the above-mentioned first marking line, in one embodiment, the marking method of the second marking line is as follows:

[0092] Step S121, adjust the spare valve drive head to be horizontal in the front-to-back and left-to-right directions, and install the clamp auxiliary device 2 on the horizontally placed spare valve drive head according to the first marking line verified to be reasonable by the test, and confirm that the top surface of the mounting seat 22 is horizontal.

[0093] At this time, the top surface of the mounting seat 22 is parallel to the tangent plane of the circumferential side surface of the spare valve driving head.

[0094] Step S122: Use a plumb line to draw a vertical line at the center point of one of the side surfaces of the mounting seat 22, and mark the position on the circumferential surface of the spring seat of the spare valve drive head that the plumb line points to.

[0095] The mounting base 22 can be configured as a rectangular plate so that a vertical line can be drawn at the center point of the side surface of the mounting base 22 .

[0096] Step S123: Place the electric magnetic drill on the mounting base 22, and adjust the position of the electric magnetic drill so that the drill bit of the electric magnetic drill is aligned with the marking point.

[0097] Place the electric magnetic drill on the mounting base 22. When the drill bit of the electric magnetic drill corresponds to the marking point on the circumferential surface of the spare valve drive head spring seat, the drill bit extension line of the electric magnetic drill can be along the direction of the radial center axis of the online valve drive head spring seat.

[0098] Step S124 : Draw the installation position of the electric magnetic drill base suction cup on the installation base 22 on the installation base 22 to form a second marking line.

[0099] The base of an electric magnetic drill is typically rectangular, so the top surface of mounting base 22 should be larger than the area of ​​the drill base. Once the drill is properly positioned on mounting base 22, the drill base's position can be marked on mounting base 22 according to its outer contour, forming a second marking line.

[0100] The marking method for the second marking line provided in this embodiment is simple to operate. When the clamp auxiliary device 2 with the second marking line marked is subsequently fixed to the online valve drive head, the electric magnetic drill can be quickly positioned on the mounting seat 22 through the second marking line.

[0101] With reference to the accompanying drawings, the bottom hole machining method of the valve drive head 1 bracket provided in the embodiment of the present application will now be described.

[0102] This embodiment provides a clamp auxiliary device 2, which includes an annular body 21, a first adjusting member 23, a second adjusting member 24 and a mounting seat.

[0103] The annular body 21 comprises at least two curved members, arranged sequentially along the circumference. Two adjacent curved members are detachably connected via a first adjusting member 23, while the remaining adjacent curved members are pivotally connected. When the auxiliary clamp device 2 is in use, the annular body 21 can be opened and fitted over the driver head through the pivoting connection between the curved members. The first adjusting member 23 is then used to connect the corresponding curved members, securing the auxiliary clamp device 2 on the driver head.

[0104] The second adjusting member 24 is provided on the annular body 21 , and the position of the second adjusting member along the radial direction of the annular body is adjustable. By providing the second adjusting member 24 , the position of the annular body 21 on the drive head can be finely adjusted.

[0105] The mounting seat 22 is provided on the annular body 21 and is used for mounting the electric magnetic drill.

[0106] The clamp auxiliary device 2 provided in this embodiment, while serving as an auxiliary tool to implement the valve drive head bracket bottom hole processing method, has a simple structure and is easy to operate.

[0107] In this embodiment, the clamp auxiliary device is first applied to the offline spare valve drive head, and then the first adjusting member 23 and the second adjusting member 24 are adjusted so that the top surface of the mounting seat 22 is horizontal, and marks are made on the first adjusting member 23 and the second adjusting member 24 to form a first marking line; the position of the electric magnetic drill on the mounting seat is adjusted so that the extension line of the electric magnetic drill bit can be along the radial center axis direction of the spring seat of the online valve drive head, and at this time, a second marking line is made on the mounting seat 22.

[0108] In one embodiment, the mounting seat 22 is disposed in the middle region of the first arc-shaped member 211. The mounting seat 22 is flat and is disposed tangentially to the annular body 21. The tangent point between the mounting seat 22 and the annular body 21 is located at the center of the mounting seat 22. Regarding the position of the mounting seat 22 on the annular body 21, not only is the mounting seat 22 disposed tangentially to the annular body 21, but also the distance from the center line of the mounting seat 22, which is parallel to the axis of the annular body 21, to the two side edges of the mounting seat 22 is required to be the same. Figure 5 , that is, the distance from center point A to point B is the same as the distance from center point A to point C.

[0109] The shape of the mounting seat 22 is limited in this embodiment so as to find the position of the electric magnetic drill on the mounting seat 22 in the manner of finding the marking point with a plumb bob as described above, and thus determine the second marking line on the mounting seat 22 .

[0110] In one embodiment, the first adjusting member 23 is a screw assembly, which is easy to operate and facilitates adjusting the position of the annular body 21 on the spare valve drive head.

[0111] Regarding the screw assembly, for example, the screw assembly includes a screw and a nut disposed on the screw, the nut is threadedly connected to the screw, and the screw passes through two matching second arc-shaped members 212.

[0112] In one embodiment, the second adjusting member 24 is an adjusting bolt.

[0113] The second adjusting member 24 is threadedly connected to the annular body 21. By rotating the second adjusting member 24, the length of the second adjusting member 24 extending into the annular body 21 can be adjusted. When the clamp auxiliary device 2 is mounted on the horizontally placed spare valve drive head, the second adjusting member 24 can be rotated to abut against the spare valve drive head, thereby finely adjusting the position of the annular body 21 on the spare valve drive head.

[0114] In one embodiment, three arc-shaped members are provided, namely, a first arc-shaped member 211 and two second arc-shaped members 212. One end of the two second arc-shaped members 212 is respectively provided at both ends of the first arc-shaped member 211. The second arc-shaped member 212 is rotatably connected to the first arc-shaped member 211. The other ends of the two second arc-shaped members 212 are detachably connected via a first adjusting member 23. The annular body 21 can be fixed to the valve drive head 1 via the first adjusting member 23.

[0115] The annular main body 21 provided in this embodiment has a simple structure and is easy to produce and process.

[0116] In one embodiment, the mounting seat 22 can be fixed on the first arc-shaped member 211. Regarding the connection between the mounting seat 22 and the first arc-shaped member 211, the mounting seat 22 can be welded to the first arc-shaped member 211, or the mounting seat 22 can also be detachably connected to the first arc-shaped member 211 through connecting members such as bolts.

[0117] In one embodiment, two or more second adjustment members 24 are provided on the first arc-shaped member 211, and the second adjustment members 24 are symmetrically distributed on both sides of the mounting seat 22. The symmetrical arrangement of the second adjustment members 24 facilitates fine-tuning the position of the annular body 21 relative to the drive head 1 so that the top surface of the mounting seat 22 is horizontal.

[0118] In one embodiment, the thickness of the first arc-shaped member 211 is greater than the thickness of the second arc-shaped member 212 ; in another embodiment, a hole for reducing weight is provided on the first arc-shaped member 211 .

[0119] The thickness of the first arc-shaped member 211 is greater than that of the second arc-shaped member 212. The first arc-shaped member 211 is made of a relatively strong material, which can ensure the stability and reliability of the electric magnetic drill adsorption foundation. By setting the first arc-shaped member 211 as an arc-shaped frame structure, the weight of the clamp auxiliary device 2 can be reduced.

[0120] In one embodiment, the second curved member 212 includes two or more curved segmented members 2121, which are sequentially spaced apart along an axial direction parallel to the clamp auxiliary device 2. One end of each curved segmented member 2121 is rotatably connected to the first curved member 211. The curved segmented member 2121 in one second curved member 212 is detachably connected to the corresponding curved segmented member 2121 in another second curved member 212 via a first adjusting member 23.

[0121] See Figure 4 , illustrating that the second arc-shaped member 212 includes two arc-shaped segmented members 2121. Figure 4 It is also shown that the corresponding two arc-shaped segmented parts 2121 are detachably connected through the first adjusting part 23.

[0122] Regarding the production of the clamp auxiliary device 2, the following embodiments can be specifically adopted:

[0123] The first curved member 211 (also known as a hoop): This workpiece is formed from a steel plate approximately 15 mm thick, which is rolled and then partially cut to remove material, forming a steel strip structure with a side length of approximately 15 mm. This minimizes the weight of the first curved member 211 while ensuring strength. The rolled length is approximately 1 / 3 of the outer circumference of the cylindrical body 12 of the driver head 1, and the rolled inner radius is consistent with the outer diameter of the cylindrical body 12 of the driver head 1, ensuring a good fit between the first curved member 211 and the cylindrical body 12. Four threaded bottom holes are designed and machined in the middle and at both ends of the first curved member 211. The four threaded holes in the middle are used to secure the mounting seat 22, and the four threaded holes at each end are used to accommodate adjustment bolts.

[0124] Mounting seat 22: The workpiece is a square flat plate made of carbon steel with a thickness of about 8 mm. The length and width are about 3 mm larger than the size of the magnetic suction cup of the electric magnetic drill to be used. The upper and lower surfaces are processed flat and are designed with four countersunk bolts. The mounting seat 22 can be fixed to the first arc-shaped member 211 through the countersunk bolts.

[0125] Arc-shaped segmented member 2121 (also known as a clamp): This workpiece is formed by rolling four iron bars with a thickness of approximately 3mm. The rolled length is approximately 2 / 7 of the outer circumference of the cylindrical body 12 of the drive head 1, and the rolled inner radius is consistent with the outer diameter of the cylindrical body 12 of the drive head 1. A hanging ear 2122 is welded to one end of the arc-shaped segmented member 2121, which is rotatably connected to the first arc-shaped member 211 via a movable bolt assembly, that is, the arc-shaped segmented member 2121 and the first arc-shaped member 211 can flexibly rotate with each other; the other end of the arc-shaped segmented member 2121 is bent to form a connecting portion 2123, and a bolt hole is machined on the connecting portion 2123 to connect to the screw assembly. The screw assembly should preferably use a screw rod of sufficient length to ensure that after it is combined with the first arc-shaped member 211 and the arc-shaped segmented member 2121, the clamp auxiliary device 2 can completely clamp the outer circumference of the cylindrical body 12 of the valve drive head 1.

[0126] The device of the present invention cleverly utilizes a combined structure of a first curved member 211, a second curved member 212, and an adjustment screw assembly. The first curved member 211 is constructed of sturdy material, ensuring the stability and reliability of the electric magnetic drill's adsorption base. The second curved member 212 is constructed of thin iron bars, minimizing component weight. The first and second curved members 211 and 212 are flexibly connected, facilitating assembly and disassembly in confined spaces. The adjustment screw assembly not only compensates for length mismatches between the first and second curved members 211 and 212 on the cylindrical body 12 of the drive head 1, but also functions as a means of initial and fine-tuning in conjunction with the adjustment screw on the first curved member 211. The entire device weighs only approximately 15 kg and can be carried and assembled and disassembled flexibly by a single person during on-site use, without the need for lifting equipment.

[0127] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A method for machining the bottom hole of a valve drive head bracket, characterized in that: include: Using an offline spare valve drive head with the same structural dimensions to determine a first marking line and a second marking line on the clamp auxiliary device, wherein the first marking line is marked on an adjusting member of the clamp auxiliary device, and the second marking line is marked on a mounting seat of the clamp auxiliary device; Adjusting the adjusting member according to the first marking line to sleeve the marked clamp auxiliary device onto the in-line valve drive head; Installing the electric magnetic drill on the mounting base according to the second marking line; Starting the electric magnetic drill to perform a drilling operation on the spring seat on the in-line valve drive head; The marking method of the first marking line includes: Sleeve the clamp auxiliary device onto the horizontally placed spare valve driving head, and adjust the adjusting piece on the clamp auxiliary device so that the top surface of the mounting seat is horizontal when the clamp auxiliary device is fixed on the spare valve driving head; Marking the installation position of each adjusting member on each adjusting member to form the first marking line; The marking method of the first marking line further includes: Remove the clamp auxiliary device from the spare valve drive head, and then fix the clamp auxiliary device on the spare valve drive head according to the first marking line on each adjusting member; Using a level, test and verify whether the top surface of the mounting base is horizontal; If so, the first marking line is determined to be reasonable; if not, the first marking line marked on the adjusting member is re-determined; The marking method of the second marking line includes: Adjust the spare valve drive head to be horizontal in the front-to-back and left-to-right directions, and place the clamp auxiliary device on the horizontal spare valve drive head according to the first marking line verified to be reasonable during testing, and confirm that the top surface of the mounting seat is horizontal; Use a plumb line to draw a vertical line at the center point of one of the side surfaces of the mounting seat, and mark the position on the circumferential surface of the spring seat of the spare valve drive head that the plumb line points to; Placing the electric magnetic drill on the mounting base, and adjusting the position of the electric magnetic drill so that the drill bit of the electric magnetic drill is aligned with the marked point; The installation position of the drill base suction cup of the electric magnetic drill on the installation base is drawn on the installation base to form the second marking line.

2. The method for machining the bottom hole of the valve drive head bracket according to claim 1, characterized in that: The adjusting member is adjusted according to the first marking line so that the clamp auxiliary device is fixed to the online valve driving head, and the top surface of the mounting seat is parallel to the cross-section of the circumferential side of the online valve driving head; And / or, by utilizing the characteristic that the base suction cup of the electric magnetic drill and its drill bit are perpendicular to each other, when the electric magnetic drill is installed on the mounting base through the second marking line, the drill bit extension line of the electric magnetic drill is along the radial center axis direction of the online valve drive head spring seat.

3. The method for machining the bottom hole of the valve drive head bracket according to claim 1, characterized in that: The clamp auxiliary device is sleeved on the horizontally placed spare valve driving head, and the adjusting piece on the clamp auxiliary device is adjusted so that when the clamp auxiliary device is fixed on the spare valve driving head, the top surface of the mounting seat is in a horizontal state, including: First, use a level to adjust the spare valve drive head to a horizontal state in the front-to-back direction and the left-to-right direction; Then, the clamp auxiliary device is placed on the horizontally placed spare valve drive head, and the adjustment member on the clamp auxiliary device is adjusted and a level ruler is used to make the top surface of the mounting seat horizontal in the front-to-back direction and the left-to-right direction; After the adjustment of the adjusting member is completed, the clamp auxiliary device is fixed to the spare valve driving head.

4. A clamp auxiliary device for implementing the valve drive head bracket bottom hole processing method according to any one of claims 1 to 3, characterized in that: The clamp auxiliary device includes an annular body, a first adjusting member, a second adjusting member and a mounting seat, wherein: The annular body includes at least two arc-shaped members, each of which is arranged in sequence along the circumferential direction, wherein two adjacent arc-shaped members are detachably connected via the first adjusting member, and the remaining two adjacent arc-shaped members are rotatably connected; The second adjusting member is provided on the annular body, and the position of the second adjusting member along the radial direction of the annular body is adjustable; The mounting seat is arranged on the annular main body and is used for mounting an electric magnetic drill.

5. The clamp auxiliary device according to claim 4, characterized in that: The mounting seat is a flat plate structure and is arranged tangent to the annular body. The tangent point between the mounting seat and the annular body is located at the center of the mounting seat.

6. The clamp auxiliary device according to claim 4, characterized in that: The first adjusting member is a screw assembly; more than two second adjusting members are provided, and the second adjusting members are adjusting bolts.

7. The clamp auxiliary device according to claim 4, characterized in that: The arc-shaped members are provided with three, namely a first arc-shaped member and two second arc-shaped members, one end of the two second arc-shaped members is rotatably connected to the two ends of the first arc-shaped member respectively, and the other ends of the two second arc-shaped members are detachably connected via the first adjusting member; The thickness of the first arc-shaped member is greater than the thickness of the second arc-shaped member; And / or, the first arc-shaped member is provided with an opening for reducing weight.

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