Fastening tool for movable conducting rod and double-thread screw

Abstract

The invention discloses a fastening tool for a movable conducting rod and a double-thread screw, which is applied to the technical field of electrical equipment assembly, and comprises a fastening rod, one end of the fastening rod is provided with a fastening cavity, and an avoiding hole communicated with the fastening cavity is formed in the fastening rod; the datum plate is provided with a sleeving hole, the periphery of the fastening rod is sleeved with the sleeving hole, and a gap is reserved between the sleeving hole and the fastening rod; the movable conducting rod is arranged in the solid-sealed polar pole, and the end face of the movable conducting rod is provided with an internal thread screw hole; the double-thread screw rod comprises a first screw rod, a second screw rod and a fastening block connected between the first screw rod and the second screw rod, and the first screw rod is screwed into the internal thread screw hole; during fastening, the datum plate is fixed to the end face of the solid-sealed polar pole, the fastening block is sleeved with the fastening cavity, the second screw extends into the receding hole, the double-thread screw can be driven to rotate synchronously by rotating the fastening rod, and fastening of the double-thread screw and the internal thread screw hole is completed. The problems of coaxiality, operability and reliability in fastening of the movable conducting rod and the double-thread screw are solved.

Description

Technical Field

[0001] This invention relates to the field of electrical equipment assembly technology, and in particular to a fastening fixture for a moving conductive rod and a double-ended screw. Background Technology

[0002] For 24kV and below solid-sealed poles, the moving conductive rod (moving end of the vacuum interrupter) is connected to the insulating tie rod via a double-ended screw. In existing technology, the moving conductive rod is first fixed to the double-ended screw, and then cast as a solid-sealed pole as a whole.

[0003] The method of fixing the moving conductor rod to the double-ended screw is as follows: Most of the time, before casting the solidified pole, anaerobic adhesive is applied to one end of the double-ended screw and then fixed to the moving conductor rod. However, this often results in inconsistent exposed lengths of the double-ended screw, leading to inconsistent exposed screw lengths of the insulating tie rods in the finished solidified single pole, causing significant errors in the circuit breaker's rigid break point reference value. Furthermore, after casting the solidified pole, the epoxy resin curing temperature is 140℃~150℃. If anaerobic adhesive is used for fastening the double-ended screw, some of the adhesive will fail at the epoxy resin curing temperature after curing. This results in the solidified pole being acceptable when assembled into a solidified single pole, but after the solidified single pole is assembled into the circuit breaker, the double-ended screw loosens after one cycle (out of 100 cycles) or two cycles (out of 200 cycles) of the circuit breaker's first break-in, causing a closing bounce time >2ms.

[0004] In a few cases, the double-ended screw is fixed to the moving conductive rod and then brazed together. However, using brazing for the double-ended screw can easily lead to loosening of the screw, causing a closing bounce time greater than 2ms. In this case, the entire solid-sealed pole must be scrapped and loses its repair value.

[0005] Regardless of the method used, the alignment of the moving conductive rod, conductive block, and double-ended screw is poor, and assembly deviations cause the closing bounce time to be too long.

[0006] In conclusion, how to effectively solve the above problems is an urgent issue that needs to be addressed by those skilled in the art. Summary of the Invention

[0007] The purpose of this invention is to provide a fastening fixture for a moving conductive rod and a double-ended screw, which solves the problems of coaxiality, operability and reliability in the fastening of the moving conductive rod and the double-ended screw.

[0008] To solve the above-mentioned technical problems, the present invention provides a fastening fixture for a moving conductive rod and a double-ended screw, comprising:

[0009] A fastening rod has a fastening cavity at one end, and an avoidance hole communicating with the fastening cavity is opened inside the fastening rod;

[0010] The reference plate is provided with a fitting hole, which fits onto the outer periphery of the fastening rod and leaves a pre-existing gap with the fastening rod;

[0011] The movable conductive rod is disposed inside the solidified electrode post, and the end face of the movable conductive rod is machined with an internal threaded hole; the double-ended screw includes a first screw, a second screw, and a fastening block connected between the first screw and the second screw, and the first screw is screwed into the internal threaded hole;

[0012] During tightening, the reference plate is fixed to the end face of the sealing pole, the tightening cavity covers the tightening block, the second screw extends into the clearance hole, and rotating the tightening rod can drive the double-ended screw to rotate synchronously, thus completing the tightening of the double-ended screw with the internal threaded hole.

[0013] Optionally, the reference plate is attached to the end face of the sealing pole, and the reference plate is provided with a reference surface; the bottom wall of the fastening cavity abuts against the end face of the fastening block; the outer wall of the fastening rod is engraved with a reference line and two fastening qualified lines, and the two fastening qualified lines form a fastening qualified interval, and the reference line is located within the fastening qualified interval.

[0014] Under standard tightening conditions, the reference surface is flush with the reference line; when the height of the reference surface falls into the tightening range after tightening is completed, it is determined that the double-ended screw and the internal threaded hole have been tightened in place.

[0015] Optionally, the side wall of the fastening rod is engraved with scale lines, and the scale lines are distributed sequentially from one end near the fastening cavity as negative scale lines, zero scale lines and positive scale lines; wherein, the zero scale line corresponds to the reference line, the two fastening qualified lines correspond to the set negative value and the set positive value respectively, and each scale line directly indicates the assembly deviation after the double-ended screw is fastened in place.

[0016] Optionally, it also includes a comparison plate, which is attached to the reference surface of the reference plate and can slide radially along the fastening rod. The indicator head of the comparison plate can extend to the scale line on the outer wall of the fastening rod to directly read the current deviation value.

[0017] Optionally, the fastening rod has a measuring groove on its side wall, and the scale line is located on the side wall of the measuring groove; the indicator head of the comparison plate can slide radially into the measuring groove and fit with the scale line.

[0018] Optionally, the multiple comparison plates are evenly distributed and slide synchronously along the circumference of the fastening rod; after fastening is completed, the average value of the measured values ​​of each comparison plate is taken as the final deviation of the double-ended screw assembly.

[0019] Optionally, a fixing block is also provided, with a receiving groove on its bottom surface. The fixing block has an elongated hole extending radially along the fastening rod. The comparison plate includes an indicator plate and a lever. The lever passes through the elongated hole, and the indicator plate is embedded in the receiving groove. The bottom surface of the fixing block is fixedly connected to the reference plate. When the lever slides along the elongated hole, the indicator plate drives the indicator head to move forward and backward radially in sync.

[0020] Optionally, the receiving groove is a through groove that extends radially along the fastening rod, and a gap is maintained between the surface of the indicator plate and the bottom and wall of the through groove; the bottom surface of the indicator plate is equipped with a roller, and the roller makes rolling contact with the reference plate.

[0021] Optionally, the two ends of the elongated hole are semi-circular arcs. When the lever abuts against the semi-circular arc near the fastening rod, the indicator head is exactly in contact with the scale line; when the lever abuts against the semi-circular arc away from the fastening rod, the two ends of the indicator plate are flush with the two ends of the fixing block.

[0022] Optionally, the reference plate is provided with a connecting hole, and the end face of the solidified pole is pre-embedded with an insert with a threaded hole; the fastening fixture also includes a connecting screw, which passes through the connecting hole and engages with the threaded hole of the insert, and the axis of the connecting screw coincides with the axis of the threaded hole.

[0023] The fastening fixture of this application achieves effective torque transmission by forming a shape fit between the fastening cavity of the fastening rod and the fastening block of the double-ended screw, allowing the first screw to continue to screw into the internal threaded hole. The reference plate establishes a stable reference plane by being fixed to the end face of the solidified electrode post. The reference plate radially limits the fastening rod through the fitting hole, ensuring that the internal threaded holes of the double-ended screw and the moving conductive rod remain coaxial during the fastening process, avoiding tilting or misalignment. Thus, precise fastening of the double-ended screw can be performed even when the solidified electrode post is completely sealed and the space at the moving end is limited.

[0024] Compared to existing technologies, the fastening fixture provided in this application is applied to the finished sealing pole connected to the moving conductive rod. It can fasten the double-ended screw and the moving conductive rod during the finished product stage. Since the double-ended screw and the moving conductive rod are connected, they will not be cured by epoxy resin, thus preventing anaerobic adhesive failure. This ensures a firm connection between the moving conductive rod and the insulating tie rod, reducing the defect rate of ≥2ms closing bounce time caused by screw loosening, and lowering after-sales costs. Simultaneously, it achieves standardized assembly and dimensional inspection, improving production efficiency. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0026] Figure 1 This is an assembly diagram of the fastening fixture for the moving conductive rod and the double-ended screw provided in a specific embodiment of the present invention.

[0027] Figure 2 for Figure 1 A sectional view;

[0028] Figure 3 A view showing the fit between the fastening fixture for the moving conductive rod and the double-ended screw and the solidified terminal post;

[0029] Figure 4 This is a cross-sectional view of the fastening rod;

[0030] Figure 5 This is the front view of the comparison board;

[0031] Figure 6 This is a top view of the comparison board.

[0032] Figure label:

[0033] 1-Fastening handle; 2-Connecting screw; 3-Fastening cavity; 4-Fastening rod; 5-Double-ended screw; 6-Disc spring; 7-Conductive block; 8-Comparison plate; 9-Fixing block; 10-Reference plate; 11-Elongated hole; 12-Sealed pole; 13-Insert; 14-Indicator plate; 15-Toggle lever; 16-Indicator head; 17-Scale line; 18-Measuring groove; 19-Torsion part; 20-Accommodation groove; 21-Moving conductive rod. Detailed Implementation

[0034] The core of this invention is to provide a fastening fixture for a moving conductive rod and a double-ended screw, which solves the problems of coaxiality, operability and reliability in the fastening of the moving conductive rod and the double-ended screw.

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] In one specific embodiment provided by the present invention, please refer to Figures 1-6The fastening fixtures for the moving conductive rod and the double-ended screw include:

[0037] The fastening rod 4 has a fastening cavity 3 at one end, and a clearance hole communicating with the fastening cavity 3 is opened inside the fastening rod 4;

[0038] The reference plate 10 is provided with a fitting hole, which fits onto the outer periphery of the fastening rod 4 and leaves a gap with the fastening rod 4.

[0039] The movable conductive rod 21 is disposed inside the solidified pole post 12, and the end face of the movable conductive rod 21 is machined with an internal threaded hole; the double-ended screw 5 includes a first screw, a second screw, and a fastening block connected between the first screw and the second screw, and the first screw is screwed into the internal threaded hole;

[0040] During tightening, the reference plate 10 is fixed to the end face of the sealing pole 12, the tightening cavity 3 covers the tightening block, the second screw extends into the clearance hole, and rotating the tightening rod 4 can drive the double-headed screw 5 to rotate synchronously, thus completing the tightening of the double-headed screw 5 with the internal thread hole.

[0041] It should be noted that the moving end of the solid-sealed pole 12 includes a moving conductive rod 21, a conductive block 7, and a disc spring 6. The moving conductive rod 21 is the conductive body, and its end face has an internal threaded hole for connection with the double-ended screw 5. The conductive block 7 is fitted onto the moving conductive rod 21, and the disc spring 6 is fitted into the inner cavity of the conductive block 7. The disc spring 6 provides elastic clamping force, while the conductive block 7 is used for electrical connection and conduction. The moving conductive rod 21, the conductive block 7, and the disc spring 6 are coaxially assembled through a through-hole structure, providing a channel for subsequent fastening.

[0042] The double-ended screw 5 includes a first screw, a second screw, and an intermediate fastening block. The first screw is used to screw into the internal threaded hole of the moving conductive rod 21 to achieve a mechanical connection; the second screw faces outward and is used to connect with other components such as the insulating pull rod. The fastening block is located between the first and second screws, providing external force application, and is typically hexagonal or other polygonal in shape for easy tool clamping and force application. The entire double-ended screw 5 is an integrated structure, ensuring uniform force transmission and reliable connection.

[0043] The fastening fixture includes a fastening rod 4 and a reference plate 10, which work together to precisely fasten the double-ended screw 5.

[0044] The fastening rod 4 is the main force-applying component of the tooling. One end has a fastening cavity 3, the shape of which matches the fastening block of the double-ended screw 5, such as a hexagonal or square hole, to accommodate and transmit torque. The other end has a torsion part 19, which can be an external hexagonal, square head, or other structure that can connect to a wrench or power tool for easy external force application. For example, the torsion part 19 can be an external square head, which can be inserted into the fastening handle 1 to tighten the double-ended screw 5. The handle of the fastening handle 1 has an arc design and a non-slip sleeve. The torsion part 19 can also be an internal square head hole, into which a torque wrench can be inserted for torque verification of the double-ended screw 5.

[0045] The fastening rod 4 also has a clearance hole in its middle. This clearance hole is axially continuous and can be drilled to a set length to accommodate the second screw. The hole diameter is larger than the outer diameter of the second screw to avoid interference during tightening and ensure smooth tightening. The fastening cavity 3 communicates with the clearance hole to form a continuous accommodating space, ensuring that the double-ended screw 5 can be fully inserted and positioned. There is a step change between the clearance hole and the fastening cavity 3. During tightening, the stepped surface abuts against the end face of the fastening block. The axis of the clearance hole coincides with that of the fastening cavity 3 to ensure smooth insertion of the second screw, avoid damage to the threads, and reduce weight.

[0046] The reference plate 10 serves as the positioning and support component of the tooling. It has a fitting hole with a diameter slightly larger than the outer diameter of the fastening rod 4, for fitting onto the outer circumference of the fastening rod 4. A gap is left between the fitting hole and the fastening rod 4 to ensure that the fastening rod 4 can rotate freely and move axially. The main function of the reference plate 10 is to provide a stable reference surface for the entire tooling during the fastening process by detachably fixing it to the end face of the sealing pole 12, such as by bolts or clamps, thereby preventing skewing or shaking caused by uneven force during the fastening process and improving assembly accuracy and consistency.

[0047] By replacing the fastening chamber 3 and the fitting hole of different sizes, it can be adapted to various specifications of double-ended screws 5 and solid-sealing posts 12, and has good versatility.

[0048] The fastening fixture of this application achieves effective torque transmission by forming a shape fit between the fastening cavity 3 of the fastening rod 4 and the fastening block of the double-ended screw 5, allowing the first screw to continue to be screwed into the internal threaded hole. The reference plate 10 establishes a stable reference plane by being fixed to the end face of the solidified pole 12. The reference plate 10 radially limits the fastening rod 4 through the fitting hole, ensuring that the double-ended screw 5 and the internal threaded hole of the moving conductive rod 21 remain coaxial during the fastening process, avoiding tilting or misalignment. Thus, the double-ended screw 5 can be precisely fastened even when the solidified pole 12 is completely sealed and the space at the moving end is limited.

[0049] The method for connecting the movable conductive rod 21 and the double-ended screw 5 using the fastening fixture of this application includes the following steps:

[0050] The conductive block 7 is fitted onto the movable conductive rod 21, and the disc spring 6 is fitted into the inner cavity of the conductive block 7, aligning the through holes of the conductive block 7 and the disc spring 6 with the internal threaded hole of the movable conductive rod 21. After applying anaerobic adhesive to the first screw of the double-ended screw 5, it is passed through the through holes of the disc spring 6 and the conductive block 7, aligned with the internal threaded hole, and manually screwed in.

[0051] The reference plate 10 is fitted onto the fastening rod 4 through its mounting hole, and the reference plate 10 is fixedly connected to the end face of the sealing pole 12 to ensure the overall stability of the tooling. At this time, the fastening cavity 3 of the fastening rod 4 is aligned with the fastening block of the double-ended screw 5, and the second screw naturally extends into the clearance hole, forming an interference-free assembly state.

[0052] By applying force to the torsion part 19 of the fastening rod 4 with a wrench or power tool, the fastening rod 4 is driven to rotate. The fastening cavity 3 drives the fastening block to rotate synchronously, causing the first screw to gradually screw into the internal threaded hole. Since the reference plate 10 provides stable support, the entire fastening process remains coaxial and perpendicular, avoiding skewing.

[0053] Once the double-ended screw 5 reaches the predetermined torque or screwing depth, the force is stopped and the tooling is removed. At this point, the double-ended screw 5 and the moving conductive rod 21 are reliably connected, and the conductive block 7 and the disc spring 6 are effectively compressed, forming a stable conductive and elastic connection structure, achieving high precision and reliability in fastening the double-ended screw 5 and the moving conductive rod 21.

[0054] The fastening fixture provided in this application is applied to the finished sealing pole 12 connected to the moving conductive rod 21. It can fasten the double-ended screw 5 to the moving conductive rod 21 during the finished product stage. After the double-ended screw 5 and the moving conductive rod 21 are connected, they will not be cured by epoxy resin, thus preventing anaerobic adhesive failure. This ensures a firm connection between the moving conductive rod 21 and the insulating tie rod, reducing the defect rate of ≥2ms closing bounce time caused by screw loosening, and lowering after-sales costs. Simultaneously, it achieves standardized assembly and dimensional inspection, improving production efficiency.

[0055] In some embodiments, the reference plate 10 is attached to the end face of the sealing pole 12, and the reference plate 10 is provided with a reference surface; the bottom wall of the fastening cavity 3 abuts against the end face of the fastening block; the outer wall of the fastening rod 4 is engraved with a reference line, a maximum value line and a minimum value line, and the maximum value line and the minimum value line constitute a fastening position range, the maximum value line and the minimum value line are qualified lines, and the reference line is located within the fastening position range;

[0056] Under standard tightening conditions, the reference surface is flush with the reference line; when the height of the reference surface falls into the tightening range after tightening is completed, it is determined that the double-ended screw 5 and the internal threaded hole have been tightened to the correct position.

[0057] It is important to understand that the reference plate 10 is directly attached to the end face of the solid-sealed terminal 12, forming a stable contact interface. The reference plate 10 has a reference surface, which can be the side that contacts the end face of the solid-sealed terminal 12 or the side that is away from the solid-sealed terminal 12. This reference surface is a clear, straight edge or scribe line, which serves as a reference for subsequent visual comparison, so that the entire judgment system has a fixed, visible, zero-displacement reference point, avoiding misjudgment due to the floating or tilting of the reference plate 10.

[0058] The bottom wall of the fastening cavity 3 abuts against the end face of the fastening block. That is, when the fastening rod 4 is inserted into the double-ended screw 5, the fastening cavity 3 not only transmits torque but also forms an axial limiting contact with the end face of the fastening block through its bottom wall. This structure ensures that the axial position of the fastening rod 4 changes synchronously with the screw-in depth of the double-ended screw 5, providing a physical basis for the subsequent movement of the scribe line. In other words, the visual position of the fastening rod 4 accurately reflects the mechanical position of the double-ended screw 5.

[0059] The outer wall of the fastening rod 4 is engraved with a baseline, a maximum value line, and a minimum value line. These three lines are parallel and can be loops, partial loops, or short lines, distributed axially. The baseline is located between the maximum and minimum value lines. The engravings use high-contrast markings, such as white or fluorescent coatings, for easy identification in low-light assembly environments. The baseline represents the theoretical position of the standard tightening state; that is, when the double-ended screw 5 reaches the design preload or optimal contact state, the reference surface should be completely flush with the baseline. The area between the maximum and minimum value lines constitutes the tightening range, which are considered acceptable. The baseline lies within this range. This range does not represent a precise point but rather an allowable range to accommodate minor displacement deviations caused by thread manufacturing errors, frictional resistance, or differences in operating force. In other words, the tightening range is a acceptable window; as long as the reference surface falls within this range after tightening, the assembly requirements are considered met. Absolute alignment is not required, balancing efficiency and tolerance.

[0060] As the double-ended screw 5 is continuously screwed into the internal threaded hole, it gradually moves towards the interior of the sealing post 12. Tightening can be stopped when the reference surface gradually descends from above the reference line to be flush with it, and continues to move towards the reference line until it is completely within the tightening range. Because the bottom wall of the tightening cavity 3 abuts against the tightening block, the tightening rod 4 is pushed synchronously, causing axial displacement of the etched lines on its outer wall relative to the fixed reference surface. By observing the relative position of the reference surface and the etched lines, it is possible to indirectly determine whether the screw's insertion depth has reached the expected range. Operators do not need to rely on torque values ​​or experience; visual alignment is sufficient to confirm proper tightening. After tightening, the reference surface is within the tightening range, indicating that the double-ended screw 5 is neither too loose nor too tight, and is within the allowable balance zone of mechanical and electrical performance.

[0061] Therefore, by measuring the relative displacement between the scribe line and the reference surface, the abstract torque or depth is transformed into a visible positional relationship, significantly reducing reliance on operational experience and improving consistency in judgment. This ensures a uniform exposed length of the double-ended screw 5, which in turn ensures a uniform exposed screw length of the insulating tie rod of the finished solid-sealed pole 12, reducing the error of the circuit breaker's rigid break point reference value. If the reference surface is not within the tightened area, it can be detected immediately, providing process self-inspection capabilities and reducing potential quality issues. Testing shows that the assembly error of the double-ended screw 5 assembled using this tooling is controlled within ±0.5mm, allowing for the selection of products with acceptable exposed lengths to match the length of newly assembled components in the next process.

[0062] In some embodiments, the side wall of the fastening rod 4 is engraved with scale lines 17. The scale lines 17 are distributed sequentially from one end near the fastening cavity 3, including negative scale lines, zero scale lines and positive scale lines. The zero scale line corresponds to the baseline, and the two fastening qualified lines correspond to the set negative value and the set positive value, respectively. Each scale line 17 directly indicates the assembly deviation after the double-ended screw 5 is fastened in place.

[0063] It should be noted that the cylindrical surface of the fastening rod 4 is machined with a graduated band, starting from the end closest to the fastening cavity 3 and arranged sequentially in the direction away: first a negative value, then passing the zero value, and finally entering the positive value. The positive value direction indicates that the double-ended screw 5 is screwed in more and the exposed length is less, while the negative value direction indicates that the double-ended screw 5 is screwed in less and the exposed length is more. The zero value is the baseline, which is the zero deviation reference corresponding to the ideal fastening depth. The two qualified fastening lines fall on a certain negative value line and a certain positive value line, respectively, forming a symmetrical or asymmetrical allowable bandwidth. Any scale reading within the bandwidth represents a qualified assembly state.

[0064] The width, depth, and color of the engraved lines can be kept consistent. The zero mark and the two qualified lines use double the line width or a bright color block, which can be quickly captured even during rapid rotation. The positive and negative value areas can be differentiated by gradients or segment lengths, allowing operators to determine which side is biased without getting close, achieving one-click orientation.

[0065] During the tightening process, the reference plate 10 remains pressed against the end face of the sealing pole 12, and its reference surface becomes a fixed reading pointer. The tightening rod 4 moves axially as the double-ended screw 5 is screwed in, and the scale slides across the reference surface. When the tightening action stops, the scale value aligned with the reference surface is the measured deviation of this assembly: if it points to a positive value and has not passed the qualified line, it means that tightening needs to continue; if it points to a negative value and has passed two qualified lines, it means that the optimal point has been missed, and the moving conductive rod 21 is unqualified; if it is between two qualified lines, the reading can be directly recorded, forming a traceable deviation database, providing the original quantitative basis for subsequent torque optimization and thread tolerance correction. The entire process requires no additional measuring tools; the rod itself serves as the scale. Thus, continuous scale refines the original interval judgment into readable discrete deviation values, making the assembly results digitally traceable for the first time.

[0066] In some embodiments, a comparison plate 8 is also included. The comparison plate 8 is attached to the reference surface of the reference plate 10 and can slide radially along the fastening rod 4. The indicator head 16 of the comparison plate 8 can extend to the scale line 17 on the outer wall of the fastening rod 4 to directly read the current deviation value.

[0067] It is important to understand that the comparison plate 8 is a thin sheet structure, with its back side always in contact with the reference surface of the reference plate 10, thus inheriting the zero-displacement characteristic of the reference surface. Simultaneously, a radial sliding pair is formed between the comparison plate 8 and the reference surface, allowing free pushing and pulling along the radius of the fastening rod 4, but without rotational freedom. An indicator head 16 extends from the comparison plate 8 towards the scale band. The tip of the indicator head 16 is sharpened to an acute angle or a fine point, precisely approximating the scale line 17 on the outer wall of the fastening rod 4, achieving point-to-point reading. In a preferred embodiment, the width of the tip of the indicator head 16 is slightly smaller than the minimum scale interval to avoid obscuring the two scale lines; its surface can be coated with a contrasting color or fluorescent dots, enabling rapid alignment even in low-light conditions inside the cabinet. To eliminate parallax on the cylindrical surface, the indicator head 16 often has a slightly curved lip, with a curvature approximately equal to the outer diameter of the fastening rod 4, ensuring the tip always remains in contact with the wall without scratching the scale.

[0068] As the fastening rod 4 rotates and moves axially, the scale continuously slides across the indicator head 16. Since the comparison plate 8 remains stationary only with the reference plate 10, the indicator head 16 becomes the reading pointer. The operator can capture the scale cut off by the indicator head 16 with peripheral vision during pauses in rotation, or even during slow, continuous rotation, without waiting for the rod to completely stop, thus locking in the deviation value. The indicator head 16 reduces reading errors; deviations are negligible even after multiple repetitions by the same operator, and high consistency is achieved between different operators.

[0069] In some embodiments, the side wall of the fastening rod 4 is provided with a measuring groove 18, and the scale line 17 is located on the side wall of the measuring groove 18; the indicator head 16 of the comparison plate 8 can slide radially into the measuring groove 18 and fit with the scale line 17.

[0070] It should be noted that the measuring groove 18 is an axial narrow groove, recessed into the outer circle of the fastening rod 4 but without opening the wall thickness, thus maintaining the strength of the rod. The groove length covers the entire range of positive, zero, and negative values. Preferably, the side wall of the measuring groove 18 facing the operator is machined into a flat surface, and the graduation line 17 is engraved on this flat wall, straightening the cylindrical graduation. The front end of the indicator head 16 is shaped into a thin blade, allowing it to slide in without gaps during radial advancement; a micro-protrusion is provided on the back of the blade, lightly touching the groove surface to prevent the head from going too deep and scratching the opposite groove wall. The side wall of the indicator head 16 is parallel and fits against the graduation plane, forming a knife-edge-fitting-ruler effect. When reading, only the alignment of the blade with the graduation line is considered, and the line of sight is coplanar with the graduation, eliminating cylindrical parallax.

[0071] The sliding of the indicator head 16 against the groove wall improves the reading accuracy from half a division to full alignment of the knife edge. The repeatability error for the same operator is very small, solving the most difficult problem to overcome in curved scales: line-of-sight tilt error.

[0072] In some embodiments, multiple comparison plates 8 are evenly distributed along the circumference of the fastening rod 4 and slide synchronously; after fastening is completed, the average value of the measured values ​​of each comparison plate 8 is taken as the final deviation of the double-ended screw 5 assembly.

[0073] It should be noted that several comparison plates 8 are distributed at equal angles along the same cross section of the fastening rod 4, and the back of each comparison plate 8 is in contact with the reference surface; when pushing, each comparison plate 8 is simultaneously radially fed, and all indicator heads 16 slide into the measuring groove 18 to avoid the time difference in reading caused by pushing first and then pushing.

[0074] The thickness and blade shape of the indicator head 16 of each comparison plate 8 are completely consistent with the single plate scheme, and they point to the same axial scale zone; each indicator head 16 is evenly distributed in the circumferential direction in the measuring groove 18, just like multiple pointers sharing a scale.

[0075] Since the scale line 17 inevitably suffers from local bumps, paint defects, or burrs on site, the single-point reading may deviate from the true axial position. The set of readings captured simultaneously by multiple indicator heads 16 can be regarded as a circumferential scan of the same scale segment. Taking the arithmetic mean of the readings of each comparison plate 8 can smooth out the jumps caused by local defects and also offset the systematic errors caused by slight deviations in the operator's field of vision, making the final deviation value closer to the true axial displacement and reducing assembly errors.

[0076] In some embodiments, a fixing block 9 is also provided, with a receiving groove 20 on its bottom surface. The fixing block 9 has a long strip hole 11 extending radially along the fastening rod 4. The comparison plate 8 includes an indicator plate 14 and a lever 15. The lever 15 passes through the long strip hole 11, and the indicator plate 14 is embedded in the receiving groove 20. The bottom surface of the fixing block 9 is fixedly connected to the reference plate 10. When the lever 15 slides along the long strip hole 11, the indicator plate 14 drives the indicator head 16 to move radially forward and backward synchronously.

[0077] It should be noted that the fixing block 9 is a flat cuboid with a receiving groove 20 on its bottom surface. The outline of the receiving groove 20 is fitted with the outer edge of the indicator plate 14 to form a thin-layer slide. A long hole 11 runs through the top and bottom surfaces of the fixing block 9. The long circumference of the long hole 11 is radially along the fastening rod 4, serving as the movement guide for the lever 15. The comparison plate 8 includes an indicator plate 14 and a lever 15. The indicator plate 14 is a flat plate, concealed within the receiving groove 20. An indicator head 16 is provided at the front end of the indicator plate 14, and the top surface of the indicator plate 14 is connected to the lever 15. The bottom surface of the fixing block 9 is attached to the reference plate 10 and fixed with screws or pins. The indicator plate 14 is sandwiched between the reference plate 10 and the fixing block 9, with only the lever 15 exposed externally. The structure is compact and prevents foreign objects from intruding.

[0078] The operating force is applied to the upper end of the lever 15, which slides along the elongated hole 11. The indicator plate 14 moves horizontally within the receiving groove 20 without rotation or wobbling, and the indicator head 16 precisely enters and exits the measuring groove 18. The movement direction of the comparison plate 8 is guided by the elongated hole 11, and the operator's feel corresponds to the displacement of the indicator head 16, avoiding the shaking error caused by the cantilever. A slight gap is left between the lever 15 and the elongated hole 11, and the opening of the elongated hole 11 is chamfered, so the push-pull handle is smooth and there is no lateral wobbling.

[0079] In some embodiments, the receiving groove 20 is a through groove that extends radially along the fastening rod 4, and gaps are maintained between the surface of the indicator plate 14 and the bottom and walls of the through groove; the bottom surface of the indicator plate 14 is equipped with rollers, and the rollers make rolling contact with the reference plate 10.

[0080] It should be explained that the receiving groove 20 is completely open along the radial direction of the fastening rod 4, the receiving groove 20 and the elongated hole 11 are coaxial, the indicator plate 14 is placed in the receiving groove 20, and both the receiving groove 20 and the elongated hole 11 have a moving guiding effect on the indicator plate 14.

[0081] The rollers are mounted on the bottom surface of the indicator plate 14, with the axle parallel to the tangent of the fastening rod 4, and the rim directly contacting the top surface of the reference plate 10. The roller diameter is slightly larger than the gap between the bottom surface of the indicator plate 14 and the reference plate 10, ensuring that the rim is always under pressure, while the remaining part of the gap remains suspended. Only one pair of rollers is provided, placed at the front and back, forming two-point support, which prevents the indicator head 16 from pitching and ensures that the rolling trajectory is strictly radial, without side slippage or skew.

[0082] The bottom surface of the indicator plate 14 contacts the base plate 10, while the top and sides of the indicator plate 14 maintain micro-gaps with the upper and left and right walls of the through groove of the fixing block 9, respectively, achieving bottom support and a suspended state in other positions. This air suspension means that the indicator plate 14 has no sliding friction surface except for the roller contact point, which greatly reduces the resistance to forward and backward movement and also avoids jamming due to the accumulation of oil or debris.

[0083] When lever 15 is pushed, the force is transmitted to the roller shaft through indicator plate 14, and the rim rolls purely on reference plate 10. Since the sidewall of the through groove no longer bears the guiding friction and retains the anti-rotation limit, the push-pull feel changes from dry friction to light rolling, and the operating force is significantly reduced. The rolling resistance is small, making it easier to push lever 15, and also reducing lateral wear between the elongated hole 11 and lever 15.

[0084] In some embodiments, the two ends of the elongated hole 11 are semi-circular arcs. When the lever 15 abuts against the semi-circular arc near the fastening rod 4, the indicator head 16 is exactly in contact with the scale line 17. When the lever 15 abuts against the semi-circular arc away from the fastening rod 4, the two ends of the indicator plate 14 are flush with the two ends of the fixing block 9.

[0085] It should be explained that each end of the elongated hole 11 extends into a standard semicircle, the radius of which is clearance-fitted with the cylindrical section of the lever 15, forming two arc seats. The outer diameter of the lever 15 contacts the semicircular arc, and the contact surface is continuous and symmetrical; when the operating force disappears, the lever body stops at the bottom of the arc due to friction, the radial sway is contained by the arc, and the position of the indicator head 16 is locked accordingly.

[0086] The center of the semi-circular arc (inner end) near the fastening rod 4 corresponds to the position where the indicator head 16 is exactly aligned with the scale line 17. When the lever 15 abuts against the inner end, the cutting edge of the indicator head 16 maintains a constant slight pressure on the scale sidewall to prevent the cutting edge from retracting and causing reading drift when the fastening rod 4 rotates. That is, the lever 15 slides into the inner semi-circular arc along the straight section of the elongated hole 11 and automatically falls into the bottom of the arc. The indicator head 16 simultaneously extends into the measuring groove 18 and aligns with the scale. The arc limit eliminates fluctuations caused by artificial thrust, and the insertion depth is determined each time to ensure that the starting point of readings on multiple plates is consistent.

[0087] The center of the semi-circular arc (outer end) away from the fastening rod 4 corresponds to the position where the indicator plate 14 is fully retracted into the through groove and both ends are flush with the sides of the fixing block 9. This avoids deformation during transportation and eliminates the need for an additional protective cover. When the lever 15 abuts against the outer end, the lever 15 is supported laterally by the arc, and the indicator plate 14 is no longer exposed, making transportation and storage safer. In other words, when the lever 15 retracts to the outer semi-circular arc, it also self-aligns, and the indicator plate 14 is completely retracted into the through groove. Its two end cut surfaces are coplanar with the side end faces of the fixing block 9, resulting in a flat appearance without protrusions, allowing for confirmation of reset without visual inspection.

[0088] In some embodiments, the reference plate 10 is provided with a connecting hole, and the end face of the sealing pole 12 is pre-embedded with an insert 13 with a threaded hole; the fastening fixture also includes a connecting screw 2, which passes through the connecting hole and engages with the threaded hole of the insert 13, and the axis of the connecting screw 2 coincides with the axis of the threaded hole.

[0089] It should be noted that the reference plate 10 has smooth connection holes near its outer edge, and the hole positions correspond one-to-one with the embedded inserts 13 on the end face of the solid-sealed pole 12. The inserts 13 are metal bushings with threaded holes, which are directly embedded into the end face during the molding of the solid-sealed pole 12, and the opening of the threaded hole is flush with and coplanar with the end face. The connection holes only serve as channels for connecting the screw 2, ensuring that the hole walls are not deformed and that the accuracy does not decrease with repeated use.

[0090] After the connecting screw 2 passes through the connecting hole, it is screwed into the threaded hole of the insert 13. The gap between the outer diameter of the connecting screw 2 and the connecting hole is extremely small, and the axis of the connecting screw 2 and the axis of the threaded hole are theoretically coincident, forming a single-axis positioning. After tightening, the reference plate 10 is vertically pressed against the end face of the fixed pole 12. There is no gap between the plate surface and the end face of the pole, and the reference surface becomes a rigid extension of the end face of the fixed pole 12, providing an immovable zero point for all subsequent scale readings.

[0091] When the connecting screw 2 is screwed into the threaded hole, the thread provides axial tension; the precise clearance between the connecting hole and the connecting screw 2 prevents the reference plate 10 from moving radially, achieving tension without deviation. Since the insert 13 is solidified with the sealing pole 12 during sealing, the relative position of the threaded hole axis and the moving conductive rod 21 axis is fixed, thus ensuring that the reference plate 10 can be reset to the same spatial posture every time the fastening fixture is installed or removed, ensuring the alignment of the moving conductive rod 21, the conductive block 7, and the double-ended screw 5, and reducing the failure rate of exceeding the closing bounce time due to assembly deviation.

[0092] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0093] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A fastening tool for a moving conductor rod and a stud, characterized by The utility model relates to a kind of standard fastening device, including: Fastening rod (4), one end is equipped with fastening cavity (3), the fastening rod (4) is opened with the fastening cavity (3) communication and avoids the hole in it; Reference plate (10), equipped with sleeve hole, the sleeve hole is sleeved on the outer periphery of the fastening rod (4) and with the fastening rod (4) reserved gap; Dynamic conducting rod (21) is equipped in fixed sealing pole (12), and the end face of the dynamic conducting rod (21) is processed with internal thread screw hole;The double-end screw rod (5) includes first screw rod, second screw rod and fastening block connected between the first screw rod and the second screw rod, and the first screw rod is screwed into the internal thread screw hole; When fastening, the reference plate (10) is fixed on the end face of the fixed sealing pole (12), the fastening cavity (3) is sleeved on the fastening block, the second screw rod is inserted into the avoiding hole, and the fastening rod (4) can be rotated to drive the double-end screw rod (5) to rotate synchronously, to complete the fastening of the double-end screw rod (5) and the internal thread screw hole.

2. The fastening tool of claim 1 wherein, The reference plate (10) is attached to the end face of the fixed sealing pole (12), and the reference plate (10) is provided with a reference surface;The bottom wall of the fastening cavity (3) abuts against the end face of the fastening block;The outer wall of the fastening rod (4) is engraved with a reference line and two fastening-in-place qualified lines, and the fastening-in-place interval is formed between the two fastening-in-place qualified lines, and the reference line is located in the fastening-in-place interval; In the standard fastening state, the reference surface is flush with the reference line;When the height of the reference surface falls into the fastening-in-place interval after fastening, it is determined that the double-end screw rod (5) and the internal thread screw hole have been fastened in place.

3. The fastening tool of claim 2 wherein, The side wall of the fastening rod (4) is engraved with a scale line (17), and the scale line (17) is sequentially distributed from one end close to the fastening cavity (3) negative scale line, zero scale line and positive scale line;Among them, the zero scale line corresponds to the reference line, and the two fastening-in-place qualified lines correspond to the set negative value and the set positive value respectively, and each scale line (17) directly indicates the assembly deviation of the double-end screw rod (5) after fastening in place.

4. The fastening tool of claim 3 wherein, It also includes a comparison plate (8), which is attached to the reference surface of the reference plate (10) and can slide radially along the fastening rod (4), and the indicating head (16) of the comparison plate (8) can extend to the scale line (17) of the outer wall of the fastening rod (4) to directly read the current deviation value.

5. The fastening tool of claim 4, wherein The side wall of the fastening rod (4) is provided with a measuring groove (18), and the scale line (17) is located on the side wall of the measuring groove (18);The indicating head (16) of the comparison plate (8) can slide radially into the measuring groove (18) and be attached to the scale line (17).

6. The fastening tool of claim 4 wherein, A plurality of comparison plates (8) are evenly distributed along the circumference of the fastening rod (4) and slide synchronously;After fastening, the average value of the measured values of each comparison plate (8) is taken as the final deviation of the assembly of the double-end screw rod (5).

7. The fastening tool of claim 4 wherein, There is also a fixed block (9) with a receiving groove (20) on its bottom surface, and a long hole (11) through the fixed block (9) along the radial direction of the fastening rod (4); the comparison plate 8 includes an indicator plate (14) and a lever (15), the lever (15) penetrates the long hole (11), the indicator plate (14) is embedded in the receiving groove (20), and the bottom surface of the fixed block (9) is fixedly connected with the reference plate (10); when the lever (15) slides along the long hole (11), the indicator plate (14) drives the indicator head (16) to move radially synchronously.

8. The fastening tool of claim 7 wherein, The receiving groove (20) is a through groove along the radial direction of the fastening rod (4), and the surface of the indicator plate (14) and the groove bottom and groove wall of the through groove all have gaps; the bottom surface of the indicator plate (14) is provided with a roller, and the roller is in rolling contact with the reference plate (10).

9. The fastening tool of claim 7 wherein, The two ends of the long hole (11) are semicircular arcs, and when the lever (15) abuts against the semicircular arc close to the fastening rod (4), the indicator head (16) is just in contact with the scale line (17); when the lever (15) abuts against the semicircular arc away from the fastening rod (4), the two ends of the indicator plate (14) are flush with the two ends of the fixed block (9).

10. The fastening tool of claim 1 wherein, The reference plate (10) is provided with a connecting hole, and the end surface of the sealed pole (12) is pre-buried with an insert (13) with a threaded hole; the fastening tool further includes a connecting screw rod (2), the connecting screw rod (2) penetrates the connecting hole and is screwed with the threaded hole of the insert (13), and the axis of the connecting screw rod (2) coincides with the axis of the threaded hole.

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