Clamping tool for ball core coating preparation process based on thermal spraying

Abstract

The invention discloses a clamping tool based on a process for preparing a ball core coating through thermal spraying, and belongs to the field of ball core spraying. The clamping tool comprises a limiting screw, a telescopic reset spring, a positioning sliding rail, a positioning guide rail connecting rod, an ejector rod and a ball core part; the limiting screw is in threaded connection with one end of the positioning guide rail connecting rod; the telescopic reset spring is located in the positioning guide rail connecting rod, and one end of the telescopic reset spring abuts against the limiting screw. The positioning sliding rail is located in the positioning guide rail connecting rod and abuts against the other end of the telescopic reset spring. The clamping device for preparing the ball core coating is efficient and accurate, the coaxiality between the ball core and the connecting rod piece is improved, and the clamping device has the advantages of being high in production efficiency and the like. The device is used for producing the coating on the outer surface of the ball core, and the deposition efficiency of the coating on the surface of the ball core can be effectively improved. The device is compact in design, easy to operate and suitable for large-scale production, production cost is reduced, and economic benefits are improved.

Description

Technical Field

[0001] The invention relates to the technical field of ball core spraying, in particular to a clamping tool for preparing a ball core coating process based on thermal spraying. Background Art

[0002] As the core component of the ball valve, the ball core is responsible for the main contact with the application medium during application and production. Therefore, in the ball valve used in industrial fields such as coal chemical industry, the surface and inner flow channel of the ball core are easily affected by the erosion of the medium and mutual friction, which can easily cause friction, wear and corrosion problems. Therefore, in the production process, thermal spraying, cladding and surfacing are often used to prepare wear-resistant and corrosion-resistant coatings on the surface and inner flow channel to improve the performance requirements such as the surface hardness and corrosion resistance of the ball core, and comprehensively improve the service life of the ball core. However, in the production process, due to equipment limitations, the spray ball core generally needs to be clamped by tooling to carry out spray cladding and other operations, but the consumption required for a single treatment of the surface coating of a small-diameter spherical body is too large, and at the same time, the coaxiality requirements are emphasized during the spraying process.

[0003] Therefore, it is a technical problem that technical personnel in this field urgently need to solve by providing a clamping tool that can solve the problems of low efficiency in preparing coatings, difficulty in handling welding points, and inconvenience in disassembly after spraying. Summary of the invention

[0004] The present invention aims to solve at least one of the above-mentioned technical problems in the prior art to a certain extent, and provides a clamping tool for thermal spraying to prepare the surface coating of the ball core designed for small-diameter ball cores with a diameter less than DN50. The clamping tool can realize multiple spraying operations and utilize a multi-point positioning mechanism to reduce the eccentricity of the ball core and the connecting rod and improve the quality of the spray coating.

[0005] To this end, an object of the present invention is to provide a clamping fixture for preparing a ball core coating process based on thermal spraying, characterized in that it includes a limit screw, a telescopic return spring, a positioning slide rail, a positioning guide rail connecting rod, a push rod and a ball core part;

[0006] Wherein, the positioning guide rail connecting rod is a hollow tube, the limit screw is connected to one end of the positioning guide rail connecting rod by a thread; the telescopic return spring is located inside the positioning guide rail connecting rod, and one end of the telescopic return spring abuts against the limit screw; the positioning slide rail is located inside the positioning guide rail connecting rod, and the positioning slide rail abuts against the other end of the telescopic return spring;

[0007] The push rod extends into the interior of the positioning guide rail connecting rod through the other end of the positioning guide rail connecting rod, and the push rod abuts against the positioning slide rail;

[0008] The positioning guide rail connecting rod is provided with a plurality of openings, each of which is provided with a positioning ball; the plurality of openings are regularly arranged around the positioning guide rail connecting rod;

[0009] The ball core part is sleeved on the positioning guide rail connecting rod, and the inner surface of the ball core part corresponds to a plurality of positioning balls;

[0010] The positioning rail is in the shape of a truncated cone, the end of the positioning rail with a smaller cross-sectional area abuts against the telescopic return spring, and the end of the positioning rail with a larger cross-sectional area abuts against the ejector rod;

[0011] The positioning ball abuts against the side surface of the end of the positioning slide rail with a smaller cross-sectional area.

[0012] Furthermore, the diameter of the positioning ball is larger than the diameter of the opening.

[0013] Furthermore, the positioning rail is provided with limiting grooves having the same number as the positioning balls; the positioning balls are embedded in the corresponding limiting grooves, and the positioning balls can reciprocate along the limiting grooves. The positioning balls are fixed inside the positioning rail connecting rod.

[0014] Furthermore, there are five openings, five positioning balls, and five limiting grooves.

[0015] The present invention is designed by utilizing the design concept that a triangle has stability and three points can determine a circle. The design supports the core parts at more than three supporting points, avoiding eccentricity caused by positioning deviation due to one or two points. The design at more than three points can determine the inner flow channel of the core at the first three points supported during the operation of the tooling. The design can accurately locate the inner flow channel of the core, reduce eccentricity, and improve coaxiality. Compared with the traditional clamping method or welding method, the core clamped by the present invention can provide more uniform and stable support for coating, greatly reducing the defects and errors that may occur during the spraying process.

[0016] In practice, the applicant found that the existing technology often makes it difficult to ensure the coaxiality of the ball core and the connecting rod after clamping the ball core, resulting in a large eccentricity during the rotation of the power car. At the same time, the vibration of the rod is also an important reason for the large eccentricity. Therefore, the uniformity, stability and density of the coating cannot be guaranteed during the preparation process of the thermal spray coating. The result is often that the coating size thickness of certain parts of the ball core surface is thin, the porosity is large, and the coating is continuous and uneven. In order to reduce the eccentricity, improve the coaxiality requirements, and the eccentricity caused by the vibration of the rod itself, the present invention introduces the principles of triangular stability and three-point circle determination, and designs a set of feasible new invention schemes from multiple angles. This innovative scheme aims to provide a high-quality protective coating for the surface of the ball core, thereby improving production efficiency and greatly extending its service life.

[0017] To achieve the above-mentioned solution, the present invention adopts the following key technical means:

[0018] The design of the clamping end of the clamping mechanism is a core link. In order to ensure that the clamping end can clamp the ball core to meet the coaxiality requirements, a support point design higher than three points is adopted. During the support process, the eccentricity problem caused by the internal flow channel processing error can be effectively avoided. Secondly, the first three points supported during the movement of the clamping tool can stably support the ball core, using the triangle stability principle and the three-point circle determination mechanism. The mathematical proof of the stability of the triangle is as follows:

[0019] Proof: As long as the lengths of the three sides of a triangle are determined, the shape and size of the triangle are completely determined;

[0020] Take any two sides of a triangle, and the non-common endpoints of the two sides are connected by a third side;

[0021] Because: the third side cannot be stretched or bent;

[0022] So: the distance between the two end points is fixed;

[0023] Therefore: the angle between these two sides is fixed;

[0024] So: these two sides are arbitrary;

[0025] Therefore: the three angles of the triangle are fixed, thus fixing the triangle;

[0026] Therefore: the triangle is stable;

[0027] Take any two adjacent sides of an n-gon (n≥4), then the non-common endpoints of the two sides are connected by more than one edge

[0028] So: The distance between the two end points is not fixed

[0029] So: the angle between these two sides is not fixed

[0030] Therefore: Each angle of an n-gon (n≥4) is not fixed, so the n-gon has no stability;

[0031] On the basis of proving that the triangle has stability, the present invention designs more than three positioning points. The rationality of designing five points is that the positioning is not only based on the three designed points, but also relies on the point that first supports the core parts. Such a design avoids the difficulty in calibrating the dimensional deviation of the flow channel in the core due to only three supporting points, thereby improving the coaxiality of the core and reducing the eccentricity.

[0032] In addition, the design concept of the present invention is also applied to the basic principle of three-point circle determination. The inner flow channel is usually circular, and at least three unsupported points can effectively support the inner flow channel of the ball core, so the size of the inner flow channel can be determined to avoid support errors caused by size deviations. Therefore, the design with more than three points is more reasonable; but when 3 or 4 positioning points are designed, due to the design of the operating limit, the opening of the positioning guide rail connecting rod is too large, the depth of the positioning slide rail is deep, and the size of the working positioning ball cannot be assembled. The number of no more than 5 supporting points is due to the need to reduce the size of the positioning ball when there are more supporting points. The increase in the number of openings on the positioning pulley connecting rod also increases the difficulty of work. At the same time, the operating limit is bound to shrink, which reduces the size range of the clampable workpiece, and the applicability and economy continue to decline, which is not conducive to production.

[0033] Secondly, the short connecting rod support design improves the rod accuracy and reduces the runout eccentricity error caused by the processing of long rods. The thread processing at both ends improves the processing accuracy and fitting accuracy. Therefore, the fitting accuracy is further improved after the thread is matched. When the assembly is completed and the spraying operation is carried out, there is only the eccentricity caused by the overall deadweight, which greatly reduces the eccentricity and improves the coaxiality requirements, laying a good design foundation for improving the uniformity and stability of the coating preparation on the outer surface of the core.

[0034] By comprehensively applying reasonable theoretical design and combining it with actual production goals, the present invention successfully solves the limitations of traditional ball core clamping tooling, which not only improves the production efficiency of the preparation of protective coating on the surface of the ball core, but also reduces the difficulty of disassembly after spraying, further improving the quality of the coating. In the future, this technology is expected to be widely used in various high-precision industrial equipment, bringing revolutionary progress to the fields of mechanical processing, aerospace, etc.

[0035] Furthermore, a thread matching the push rod is provided in the positioning guide rail connecting rod, the positioning guide rail connecting rod and the push rod are connected via threads, and the push rod applies pressure to the positioning slide rail along the threads to enable the positioning slide rail to achieve reciprocating motion.

[0036] Furthermore, the outer surface of the positioning guide rail connecting rod is provided with threads, and two different clamping fixtures are connected through the head and tail threads of the positioning guide rail connecting rod.

[0037] Furthermore, one end of the positioning guide rail connecting rod connected to the limit screw is provided with an internal thread, and the other end of the positioning guide rail connecting rod is provided with an external thread.

[0038] The two ends of the clamping fixture of the present invention are designed with threaded fit, which can realize the mutual connection of the clamping fixtures, and further realize the clamping of multiple ball cores on a spraying line. The above scheme can realize the integrated spraying operation of multiple ball cores. This comprehensive overall clamping design greatly improves the production capacity of the ball core surface coating preparation and production, and at the same time improves the density and uniformity of the coating preparation, thereby greatly extending its service life. The present invention provides a set of efficient, economical and environmentally friendly preparation schemes for the production and maintenance of ball cores.

[0039] Furthermore, in the present invention, the clamping tooling design can be used for ball cores with a small diameter less than DN50. The openings of the positioning guide rail connecting rod are evenly distributed and the diameter is 0.5-1 mm smaller than the diameter of the positioning ball.

[0040] In the device of the present invention, there are as many as 5 positioning balls instead of 1 to 2. This is designed based on the design concept that a triangle has stability and three points can determine a circle. Such a design avoids the possibility of reduced coaxiality and increased eccentricity due to dimensional deviations in the flow channel in the ball core due to processing problems, and accurately improves the coaxiality of the ball core parts and the connecting rod. Therefore, the coating thickness and uniformity can be further accurately controlled during the spraying process; the design of the limit screw effectively limits the movement range of the positioning slide rail, avoiding the increase in eccentricity of the rod due to its own weight due to excessive range, and the design of the telescopic return spring can effectively rebound after the push rod unloads the force, causing the positioning slide rail to move backward, causing the positioning ball to fall back, effectively avoiding the failure of the positioning hole of the positioning guide rail connecting rod due to long-term loading of the loader. The positioning slide rail is designed according to the design of the positioning ball and is positioned by the positioning groove, which can effectively ensure effective cooperation with the positioning ball during assembly. The design of the slide rail determines the movement law of the positioning ball.

[0041] The clamping fixture of the present invention can solve the problems of low efficiency in preparing coating on a single surface of a small-diameter ball core, difficulty in handling welding points, inconvenience in disassembly after spraying, and existing problems during the spraying process. The spraying clamping fixture of the present invention can effectively increase the number of ball cores sprayed, while improving the coaxiality required in the spraying process of multiple ball cores and reducing production costs. The core aspect is that the movement of the slide rail groove structure drives the ball to move, thereby ensuring that the ball can support the ball core workpiece, and at the same time, the multi-rod connection mechanism can ensure the integrated spraying operation of multiple ball cores, thereby improving the operation efficiency.

[0042] The present invention provides an efficient and accurate core coating preparation clamping device, which improves the coaxiality between the core and the connecting rod, and also has the advantages of high production efficiency. The core outer surface coating is produced by the device, which can effectively improve the deposition efficiency of the core surface coating. In addition, the device is compact in design, easy to operate, suitable for large-scale production, reduces production costs, and improves economic benefits.

[0043] Compared with the prior art, the present invention has the advantages of:

[0044] (1) The coaxiality of the ball core during spraying is improved and the eccentricity is reduced. The design is based on the design concept that a triangle has stability and three points can determine a circle. This design avoids the possibility of reduced coaxiality and increased eccentricity due to dimensional deviations in the flow channel of the ball core due to processing problems, and accurately improves the coaxiality of the ball core parts and the connecting rod. The present invention provides an innovative and efficient clamping tool for the protective preparation process of the ball core surface coating.

[0045] (2) Improve the density and uniformity of coating preparation, and improve wear and corrosion resistance. The improvement of coaxiality and the reduction of eccentricity effectively avoid the dimensional defects and uniformity errors caused by low coaxiality during the coating preparation process, so it has a positive guide to improve the density and uniformity of the coating, and further positively guides the wear and corrosion resistance of the coating, so its wear and corrosion resistance is improved. Thereby extending its service life and reducing maintenance costs.

[0046] (3) High production efficiency and can assemble multiple integrated operations. The design of the two ends of the positioning guide adopts external thread design and internal thread design respectively, and ensures that they can be assembled with each other, ensuring that after a single assembly is assembled, the assembly parts can be connected to each other, and after multiple ball cores are assembled, they can be sprayed uniformly, which improves production efficiency.

[0047] (4) Convenient assembly and easy disassembly. At present, the clamping fixture for the surface coating of the thermal sprayed ball core generally adopts the spot welding connection method. It is difficult and complicated to disassemble after the spraying is completed, and other tools are required. The design of the present invention uses positioning balls for positioning. The clamping of the ball core only requires rotating the top rod. Multiple workpieces only require threaded connection. It is easy to assemble and after the spraying operation is completed, only the top rod needs to be rotated to unload. No complicated or dangerous tools are required, and it is easy to disassemble.

[0048] (5) It is easy to realize automation and industrialized production. The invention can be perfectly combined with automated equipment and production lines, and can fully realize automated coating preparation and quality control. In this way, production efficiency will be greatly improved and product quality will be more stable. This is particularly important for large-scale industrial production, which helps enterprises reduce production costs and improve market competitiveness.

[0049] In summary, the clamping tool for preparing the ball core coating process based on thermal spraying proposed by the present invention is not only innovative in theory, but also shows great potential in practice. By improving the coating quality and production efficiency and realizing the ability of automated and industrialized production, the present invention is expected to be applied in many fields. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0051] Figure 1 This is a schematic diagram of the disassembly and assembly structure of the clamping tooling of the present invention;

[0052] Figure 2 This is a schematic diagram of the assembly structure of the clamping tooling of the present invention;

[0053] Figure 3 This is a schematic diagram of the structure of the clamping fixture limit screw of the present invention;

[0054] Figure 4 This is a schematic diagram of the structure of the telescopic return spring of the clamping tool of the present invention;

[0055] Figure 5 This is a schematic diagram of the positioning slide rail structure of the clamping tooling of the present invention;

[0056] Figure 6 This is a schematic diagram of the ball positioning structure of the clamping tool of the present invention;

[0057] Figure 7 This is a schematic diagram of the positioning guide rail connecting rod structure of the clamping tooling of the present invention;

[0058] Figure 8 This is a schematic diagram of the structure of the clamping tool push rod of the present invention;

[0059] Fig. 9 This is a schematic diagram of the structure of the ball core parts of the clamping tooling of the present invention;

[0060] Fig.10 It is a schematic diagram of the working state of multiple clamping tools of the present invention;

[0061] In the accompanying drawings, the structures represented by each reference numeral are listed as follows: 1. DETAILED DESCRIPTION

[0062] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0063] In the description of the present invention, it is necessary to understand that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0064] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0065] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0066] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0067] Example 1

[0068] A clamping fixture based on a process for preparing a ball core coating by thermal spraying, comprising a limit screw 1, a telescopic return spring 2, a positioning slide rail 3, a positioning guide rail connecting rod 5, a push rod 6 and a ball core part 7;

[0069] Among them, the positioning guide rail connecting rod 5 is a hollow tube, and the limit screw 1 is connected to one end of the positioning guide rail connecting rod 5 by threading; the telescopic return spring 2 is located inside the positioning guide rail connecting rod 5, and one end of the telescopic return spring 2 abuts against the limit screw 1; the positioning slide rail 3 is located inside the positioning guide rail connecting rod 5, and the positioning slide rail 3 abuts against the other end of the telescopic return spring 2;

[0070] The push rod 6 extends into the interior of the positioning guide rail connecting rod 5 through the other end of the positioning guide rail connecting rod 5, and the push rod 6 abuts against the positioning slide rail 3;

[0071] The positioning guide rail connecting rod 5 is provided with a plurality of openings 51, each of which is provided with a positioning ball 4; the plurality of openings 51 are regularly arranged around the positioning guide rail connecting rod 5;

[0072] The ball core part 7 is sleeved on the positioning guide rail connecting rod 5, and the inner surface of the ball core part 7 corresponds to a plurality of positioning balls 4;

[0073] The positioning slide rail 3 is in the shape of a truncated cone, and the end of the positioning slide rail 3 with a smaller cross-sectional area abuts against the telescopic return spring 2, and the end of the positioning slide rail 3 with a larger cross-sectional area abuts against the ejector rod 6;

[0074] The positioning ball 4 abuts against the side surface of the end of the positioning rail 3 with a smaller cross-sectional area.

[0075] In some embodiments, the diameter of the positioning ball 4 is greater than the diameter of the opening 51 .

[0076] In some embodiments, the positioning rail 3 is provided with limiting grooves 31 having the same number as the positioning balls 4 ; the positioning balls 4 are embedded in the corresponding limiting grooves, and the positioning balls 4 can reciprocate along the limiting grooves 31 .

[0077] In other embodiments, there are five openings, five positioning balls, and five limiting grooves.

[0078] In some embodiments, a thread matching the push rod 6 is provided in the positioning guide rail connecting rod 5 , the positioning guide rail connecting rod 5 and the push rod 6 are connected by threads, and the push rod 6 applies pressure to the positioning slide rail 3 along the threads to enable the positioning slide rail to achieve reciprocating motion.

[0079] In some embodiments, the outer surface of the positioning guide rail connecting rod 5 is provided with threads, and two different clamping tools are connected through the head and tail threads of the positioning guide rail connecting rod 5 .

[0080] In other embodiments, one end of the positioning guide rail connecting rod 5 connected to the limit screw 1 is provided with an internal thread, and the other end of the positioning guide rail connecting rod 6 is provided with an external thread.

[0081] In the present invention, the limit screw is responsible for limiting the movement limit of the telescopic return spring and the positioning slide rail, the positioning ball moves in coordination with the positioning slide rail, and under the action of the push rod, the positioning slide rail moves forward and compresses the telescopic return spring, the positioning ball moves in the opposite direction of the movement direction of the positioning slide rail and gradually moves upward along the opening of the positioning guide rail connecting rod, and when the positioning ball supports the ball core part, the push rod stops exerting force.

[0082] The thread processing of the limit screw and the positioning guide rail connecting rod can be coordinated, and the processing of the hexagonal groove can facilitate operation; the setting of the telescopic return spring can ensure that the reaction force after the push rod is released causes the positioning slide rail to move backward, so that the positioning ball gradually falls back to the lowest point of the positioning slide rail, which is convenient for removing the ball core parts after the spraying operation; 5 slide rails are arranged on the positioning slide rail to ensure coordination with the positioning ball, and the positioning slide rail is arranged as a structure with one end deep and the other end low, to ensure that the positioning ball can move up and down during the movement, and at the same time, a positioning groove is opened on the positioning slide rail to ensure accurate installation and positioning; an internal thread structure is provided at one end of the positioning guide rail connecting rod, and an external thread structure is provided at the other end, and they can ensure mutual coordination. In addition, 5 holes are opened on the positioning guide rail connecting rod to ensure effective coordination with the positioning ball, and the diameter of the hole is slightly smaller than the diameter of the positioning ball (slightly less than 0.5-1mm), and a limit protrusion is processed in the rod to ensure effective coordination with the positioning slide rail.

[0083] During the operation, after tightening the limit screw with an Allen wrench, use the Allen wrench to rotate the top rod inward and extend it inward. The force acting on the positioning rail makes it move forward. Due to the position of the positioning guide rail connecting rod opening, the positioning ball moves backward along the slide rail on the positioning rail. Since the slide rail height in the direction of movement of the positioning ball is higher than the slide rail height in the direction of movement of the positioning rail, the positioning ball moves outward along the opening. When the positioning ball cannot move within the limit of movement, it means that the ball core part is supported. After ensuring that the ball core parts are clamped stably, multiple groups of assembly can be repeated. The internal and external threads of the assembled parts are matched with each other. After tightening, the thermal spraying of multiple ball core parts can be achieved.

[0084] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0085] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A clamping tool for preparing a ball core coating process based on thermal spraying, characterized in that: It includes a limit screw, a telescopic return spring, a positioning slide rail, a positioning guide rail connecting rod, a push rod and a ball core part; Wherein, the positioning guide rail connecting rod is a hollow tube, the limit screw is connected to one end of the positioning guide rail connecting rod by a thread; the telescopic return spring is located inside the positioning guide rail connecting rod, and one end of the telescopic return spring abuts against the limit screw; the positioning slide rail is located inside the positioning guide rail connecting rod, and the positioning slide rail abuts against the other end of the telescopic return spring; The push rod extends into the interior of the positioning guide rail connecting rod through the other end of the positioning guide rail connecting rod, and the push rod abuts against the positioning slide rail; The positioning guide rail connecting rod is provided with a plurality of openings, each of which is provided with a positioning ball; the plurality of openings are regularly arranged around the positioning guide rail connecting rod; The ball core part is sleeved on the positioning guide rail connecting rod, and the inner surface of the ball core part corresponds to a plurality of positioning balls; The positioning rail is in the shape of a truncated cone, the end of the positioning rail with a smaller cross-sectional area abuts against the telescopic return spring, and the end of the positioning rail with a larger cross-sectional area abuts against the ejector rod; The positioning ball abuts against the side surface of the end of the positioning slide rail with a smaller cross-sectional area.

2. According to claim 1, a clamping tool for preparing a ball core coating process based on thermal spraying, characterized in that: The diameter of the positioning ball is larger than the diameter of the opening.

3. According to claim 1, a clamping tool for preparing a ball core coating process based on thermal spraying, characterized in that: The positioning slide rail is provided with limiting grooves having the same number as the positioning balls; the positioning balls are embedded in the corresponding limiting grooves, and the positioning balls can reciprocate along the limiting grooves.

4. According to claim 3, a clamping tool for preparing a ball core coating process based on thermal spraying is characterized in that: The number of the openings is 5, the number of the positioning balls is 5, and the number of the limiting grooves is 5.

5. According to claim 1, a clamping tool for preparing a ball core coating process based on thermal spraying, characterized in that: The positioning guide rail connecting rod is provided with a thread matching the push rod, the positioning guide rail connecting rod is connected to the push rod through the thread, and the push rod applies pressure to the positioning slide rail along the thread to make the positioning slide rail realize reciprocating motion.

6. According to claim 1, a clamping tool for preparing a ball core coating process based on thermal spraying, characterized in that: The outer surface of the positioning guide rail connecting rod is provided with threads, and two different clamping fixtures are connected through the head and tail threads of the positioning guide rail connecting rod.

7. The clamping tool for preparing a ball core coating based on thermal spraying according to claim 6, characterized in that: One end of the positioning guide rail connecting rod connected to the limit screw is provided with an internal thread, and the other end of the positioning guide rail connecting rod is provided with an external thread.

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