Clamp device and method for spraying full-wrapping coatings of strip-shaped samples in batches

Abstract

The invention discloses a clamp device and method for spraying full-wrapping coatings of strip-shaped samples in batches, the clamp device comprises a plurality of rotating rod clamps, a transmission mechanism and a rotation driving source, the rotating rod clamps, the transmission mechanism and the rotation driving source are sequentially arranged at intervals along a straight line, and the rotation driving source is connected with the rotating rod clamps through the transmission mechanism; the rotary driving source drives the rotary rod clamps to rotate through the transmission mechanism. According to the method, the full-wrapping coatings of the strip-shaped samples can be rapidly sprayed in batches, and the coating preparation speed and the quality consistency are improved.

Description

Technical Field

[0001] This invention specifically relates to a fixture device and method for batch spraying a coating that fully covers strip-shaped samples. Background Technology

[0002] With the continuous development of the aviation industry, high-temperature alloy materials, due to their disadvantages such as low temperature resistance, high density, and the need for complex cooling systems, can no longer meet the requirements of future aero-engine development. Continuous silicon carbide fiber-reinforced silicon carbide ceramic matrix composites have many advantages, including low density, high temperature resistance, oxidation resistance, high specific strength, high specific modulus, and non-brittle fracture failure. Therefore, they will replace some high-temperature alloys and become an important candidate material for the hot-end components of next-generation high-performance aero-engines.

[0003] Composite materials have many structural components, are heterogeneous and anisotropic, resulting in a large number of pores and cracks in the material. Cracks or pores can become channels for oxygen diffusion. Once oxygen diffuses through pores and matrix cracks and reacts with fibers and interfaces, the composite material will lose its non-brittle fracture behavior and become embrittled, thus accelerating the failure of the composite material.

[0004] To improve the service life of composite materials, a dense coating that can block oxygen from entering needs to be prepared on its outer surface. To achieve better protection, a full-coverage coating needs to be prepared on the outer surface of the composite material to prevent oxygen from entering the interior of the composite material from areas that are not covered by the coating.

[0005] To compare the protective effects of different spray coating materials and preparation process parameters on composite materials, the fracture toughness and tensile strength retention rate of the samples after high-temperature water-oxygen corrosion are often used as evaluation criteria. Therefore, a full-coverage coating needs to be prepared on the surface of a large number of strip-shaped samples. Existing methods for preparing full-coverage coatings for strip-shaped samples have several problems, including: limited applicability of clamps to strip-shaped samples of different sizes; difficulty in centering when clamping strip-shaped samples; excessive time required for installing strip-shaped samples; adhesion between strip-shaped samples and clamps after spraying; easy crushing of the existing coating on the strip-shaped samples by the clamps during the clamping process; and overheating of the strip-shaped samples during spraying, leading to coating failure. Summary of the Invention

[0006] The purpose of this invention is to provide a fixture device and method for batch spraying a full-coverage coating on strip-shaped samples, which realizes rapid batch spraying of a full-coverage coating on strip-shaped samples and improves the speed and quality consistency of coating preparation.

[0007] The technical solution adopted in this invention is: A fixture device for batch spraying a full-coverage coating on strip-shaped samples includes multiple rotary clamps arranged sequentially at intervals along a straight line, a transmission mechanism, and a rotary drive source. The rotary drive source is connected to the multiple rotary clamps through the transmission mechanism, and the rotary drive source drives each rotary clamp to rotate through the transmission mechanism.

[0008] Preferably, the rotary clamp includes a movable clamping block and a fixed block arranged opposite to each other. The inner surfaces of the movable clamping block and the fixed block are provided with arc-shaped grooves for accommodating the clamped strip sample. The movable clamping block and the fixed block are connected by clamping screws, which are arranged on both sides of the arc-shaped grooves. The clamping parts on the upper end surfaces of the movable clamping block and the fixed block are chamfered.

[0009] Preferably, the width L of the arc-shaped groove is twice the maximum width of the strip sample, and the depth S of the arc-shaped groove is 0.8 times the minimum thickness of the strip sample.

[0010] Preferably, the chamfer is 40°~50°.

[0011] Preferably, the transmission mechanism includes a gear shaft box, which contains a plurality of straight-insertion rotary rods arranged in parallel along a straight line at intervals. The two ends of the straight-insertion rotary rods are connected to the gear shaft box through bearings. Each straight-insertion rotary rod is provided with a gear, and the gears on adjacent straight-insertion rotary rods mesh with each other. The upper end of each straight-insertion rotary rod is connected to a corresponding rotary rod clamp. One of the through-hole rotary rods serves as the active through-hole rotary rod, while the other through-hole rotary rods serve as the driven through-hole rotary rods. The lower end of the active through-hole rotary rod passes through the gear shaft box and connects to the rotary drive source.

[0012] Preferably, the rotary drive source includes a speed-regulating motor, and the output shaft of the speed-regulating motor is connected to the active direct-insertion rotary rod via a coupling; Each straight-insertion rotary rod is connected to a rotating seat at its upper end. The rotating seat is located outside the gear shaft box. Each rotary rod clamp is connected to the corresponding rotating seat by a rotating shaft. A dustproof ring is provided between the rotating seat and the gear shaft box.

[0013] A method for batch spraying a full-coverage coating onto strip-shaped samples using the above-described fixture device includes the following steps: Step 1: Round off the edges and sharp corners of the head of the strip sample, and then perform high-temperature heat treatment on the strip sample after rounding off the corners to remove the organic matter adhering to the surface. Step 2: Install multiple strip-shaped samples onto the rotating clamps of the clamping device, so that the strip-shaped samples are arranged in a straight line; Step 3: Start the rotation drive source to drive each strip sample to rotate synchronously through the clamping device; Step 4: Adjust the angle and initial height of the spraying device so that the spraying path of the spraying device covers the exposed part of the strip sample to be sprayed; the spraying device moves along the preset trajectory and performs spraying. Step 5: When the thickness of a single coating reaches half of the designed thickness, stop spraying, turn all strip samples around and install them, and repeat the spraying procedure and number of passes of steps 3-4 to complete the uniform preparation of a single full-coverage coating. Step 6: If a multi-layer full-coverage coating is required, replace the powder hopper of the spraying system and repeat the operations of steps 3-5 to complete the uniform preparation of the multi-layer full-coverage coating.

[0014] Preferably, in step 4, the preset trajectory is a bow-shaped downward or upward movement trajectory, and the preset trajectory is at least two sets of sub-trajectories covering different areas of the strip sample; the two sub-trajectories respectively cover the spraying area of ​​the exposed part of the strip sample and the spraying area of ​​the part of the strip sample that will be turned around and clamped, and the left and right boundaries of the running trajectory extend beyond the two outermost strip samples; when spraying the two sub-trajectories, only half the thickness of a single coating is sprayed.

[0015] Preferably, the spraying device includes a flame spray gun; in step 4, the specific process of adjusting the angle and initial height of the spraying device is as follows: The flame gun nozzle is tilted downwards and positioned on one side of a batch of strip-shaped samples. The initial height of the flame gun is such that the virtual extension line of the nozzle intersects the center point of the upper surface of the strip-shaped sample at the set spraying distance.

[0016] Preferably, in step 1, the fillet radius of the edges is R0.5, and the fillet radius of the sharp corners is R1; The high-temperature treatment specifically involves holding the temperature at 500℃~600℃ for 2.5~3.5 hours. In step 3, the rotation speed of the strip sample is not less than 300 rpm, and the lateral movement speed of the flame gun is less than 200 mm / s.

[0017] The beneficial effects of this invention are: This invention uses a rotary drive source to drive each rotary clamp to rotate via a transmission mechanism, thereby causing a batch of strip-shaped samples to rotate individually. It is simple to operate, has good versatility for strip-shaped samples of different sizes, does not require precise positioning of the spray gun relative to the strip-shaped sample, has strong operational error tolerance, reduces the number of times the spraying equipment needs to be restarted and the powder hopper needs to be replaced, and improves the service life of the spraying equipment and the powder hopper. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the fixture device for batch spraying a fully encapsulated coating onto strip-shaped samples in an embodiment of the present invention.

[0019] Figure 2 This is a schematic diagram of the transmission mechanism in an embodiment of the present invention.

[0020] Figure 3 This is a front view of the rotary clamp in an embodiment of the present invention.

[0021] Figure 4 yes Figure 3 Top view.

[0022] Figure 5 yes Figure 3 The right view.

[0023] Figure 6 This is a schematic diagram of the structure of the movable clamping block in an embodiment of the present invention.

[0024] Figure 7 This is a schematic diagram of the structure of the strip-shaped sample in an embodiment of the present invention.

[0025] In the diagram: 1-Flame gun, 2-Strip sample, 3-Rotating clamp, 4-Gear shaft box, 5-Speed-regulating motor, 6-Fastening screw, 7-J-type dustproof ring, 8-Driven straight-insertion rotary rod, 9-Active straight-insertion rotary rod, 10-Gear, 11-Bearing, 12-Coupling, 13-Modible clamping block, 14-Pressure screw, 15-Fixing block. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0027] In the description of this invention, it should be understood that if terms such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, they are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0028] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. They can refer to a mechanical connection or an electrical connection. They can refer to a direct connection or an indirect connection through an intermediate medium, and they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0029] Example 1 A fixture device for batch spraying a full-coverage coating onto strip-shaped samples, such as... Figures 1-7 As shown, it includes multiple rotary clamps 3 arranged sequentially at intervals along a straight line, a transmission mechanism, and a rotary drive source. The rotary drive source is connected to the multiple rotary clamps 3 through the transmission mechanism, and the rotary drive source drives each rotary clamp 3 to rotate through the transmission mechanism.

[0030] Furthermore, the rotary clamp 3 includes a movable clamping block 13 and a fixed block 15 arranged opposite to each other. The inner surfaces of the movable clamping block 13 and the fixed block 15 are provided with arc-shaped grooves for accommodating the clamped strip sample 2. The movable clamping block 13 and the fixed block 15 are connected by a clamping screw 14, which is arranged on both sides of the arc-shaped groove. The clamping parts on the upper end surfaces of the movable clamping block 13 and the fixed block 15 are both provided with chamfers.

[0031] Furthermore, the width L of the arc-shaped groove is twice the maximum width of the strip sample, and the depth S of the arc-shaped groove is 0.8 times the minimum thickness of the strip sample.

[0032] Furthermore, the chamfer is 40°~50°.

[0033] Furthermore, the upper clamping surfaces of both the movable clamping block 13 and the fixed block 15 of the rotary clamp 3 have a 45° chamfer as an optimal choice to prevent the rotary clamp 3 and the strip sample 2 from sticking together after the coating is applied. The clamping surface of the movable clamping block 13 has an arc-shaped groove to improve the alignment and stability of the strip sample 2 during installation. The width L and depth S of the arc can be determined based on the commonly used dimensions of the strip sample 2, i.e., L is twice the maximum width of the sample, and S is 0.8 times the minimum thickness of the sample. The movable clamping block 13 is made of a low-hardness magnesium-aluminum alloy material, making the clamping more stable and reducing damage to the clamping surface of the strip sample 2 during the clamping process.

[0034] Example 2 Based on Example 1, the transmission mechanism is further defined, resulting in Example 2 having even better performance.

[0035] Furthermore, the transmission mechanism includes a gear shaft box, which contains a plurality of straight-insertion rotary rods arranged in parallel along a straight line at intervals. The two ends of the straight-insertion rotary rods are connected to the gear shaft box through bearings. Each straight-insertion rotary rod is equipped with a gear, and the gears on adjacent straight-insertion rotary rods mesh with each other. The upper end of each straight-insertion rotary rod is connected to the corresponding rotary rod clamp 3. One of the through-hole rotary rods serves as the active through-hole rotary rod, while the other through-hole rotary rods serve as the driven through-hole rotary rods. The lower end of the active through-hole rotary rod passes through the gear shaft box and connects to the rotary drive source.

[0036] There are two situations where gears on adjacent through-hole rotary rods mesh with each other. One situation is that the gears on one through-hole rotary rod that mesh with the gears on the two adjacent through-hole rotary rods are different gears. The other situation is that the gears on one through-hole rotary rod that mesh with the gears on the two adjacent through-hole rotary rods are the same gear.

[0037] Furthermore, the rotary drive source includes a speed-regulating motor, the output shaft of which is connected to an active direct-insertion rotary rod via a coupling; Each straight-insertion rotary rod is connected to a rotating seat at its upper end. The rotating seat is located outside the gear shaft box 4. Each rotary rod clamp 3 is connected to the corresponding rotating seat by a rotating shaft. A dustproof ring is provided between the rotating seat and the gear shaft box 4.

[0038] Furthermore, the dustproof ring is a J-type dustproof ring 7, and the rotating seat is connected to the rotating shaft by fastening screws 6.

[0039] Furthermore, the fixing block is made of stainless steel, and the movable clamping block is made of magnesium-aluminum alloy. Through the structural design and material selection of the clamp, this method can stably clamp the strip sample with a small clamping force, avoiding damage to the sample and coating during the clamping process.

[0040] A method for batch spraying a full-coverage coating onto strip-shaped samples using the above-described fixture device includes the following steps: Step 1: Round off the edges and sharp corners of the head of the strip sample, and then place the rounded strip sample into a high-temperature electric furnace for high-temperature heat treatment to remove organic matter adhering to the surface. Step 2: Install multiple strip-shaped samples on each of the rotating rod clamps 3 of the clamping device, so that the strip-shaped samples 2 are arranged in a straight line; Step 3: Start the rotation drive source to drive each strip sample 2 to rotate synchronously through the clamping device; Step 4: Adjust the angle and initial height of the spraying device so that the spraying path of the spraying device covers the spraying area of ​​the exposed part of the strip sample and the spraying area of ​​the part that will be turned around and clamped; the spraying device moves along the preset trajectory and performs spraying, the preset trajectory being at least two sets of sub-trajectories covering different areas of the strip sample. Step 5: When the thickness of a single coating reaches half of the designed thickness, stop spraying, turn all strip samples 2 around and install them, and repeat the spraying procedure and number of passes of steps 3-4 to complete the uniform preparation of a single full-coverage coating. Step 6: If a multi-layer full-coverage coating is required, replace the powder hopper of the spraying system and repeat the operations of steps 3-5 to complete the uniform preparation of the multi-layer full-coverage coating.

[0041] Further, in step 4, the preset trajectory is a bow-shaped downward or upward movement trajectory, and the preset trajectory is at least two sets of sub-trajectories covering different areas of the strip sample; the two sub-trajectories respectively cover the spraying area of ​​the exposed part of the strip sample and the spraying area of ​​the part of the strip sample that will be turned around and clamped, and the left and right boundaries of the running trajectory extend beyond the two outermost strip samples 2; a single coating thickness of half the designed thickness is sprayed in both sub-trajectories.

[0042] Furthermore, the two sets of sub-trajectories are as follows: First sub-trajectory: The flame gun 1 is set to move back and forth left and right and gradually downward, with a lateral movement speed of less than 200mm / s. The distance between adjacent lateral trajectories is d, and the number of lateral trajectories is h2 / d+1 rounded up. The left and right boundaries of the running trajectory extend more than 50mm beyond the two outermost strip samples 2, which is used to spray the exposed part h2 of the strip sample 2. Second sub-trajectory: Keep the motion parameters of the flame gun 1 unchanged, only adjust the number of transverse trajectory to h1 / d+1 rounded up, which is used to spray the clamping part h1 at the upper end of the strip sample 2; merge the first sub-trajectory and the second sub-trajectory into a spraying program. Before running the merged program, measure the initial thickness of the central area on half the length of the strip sample 2. During the operation, measure the thickness of this area periodically. When the coating thickness reaches half of the designed thickness, stop the operation of the merged program.

[0043] Furthermore, the spraying device includes a flame spray gun 1; in step 4, the specific process of adjusting the angle and initial height of the spraying device is as follows: The flame gun nozzle is tilted downwards and positioned on one side of a batch of strip-shaped samples. The initial height of the flame gun is such that the virtual extension line of the nozzle intersects the center point of the upper surface of the strip-shaped sample at the set spraying distance.

[0044] To be more specific: First, position the flame gun 1 perpendicular to the gear shaft box 4, then tilt it downwards by 30°, so that the virtual extension line of the flame gun 1 nozzle intersects the center point of the upper end face of the strip sample 2 at the set spraying distance. This height is the initial height of the flame gun 1.

[0045] Furthermore, in step 1, in order to reduce the stress concentration in the coating caused by the sharp edges and corners of the sample shape, which would reduce the performance degradation, and because the coating on the sharp edges and corners is easily crushed by the fixture during the coating preparation process, the edges and sharp corners of the head end face of all strip-shaped samples are rounded, with the edge rounding size being R0.5 and the sharp corner rounding size being R1. The high-temperature treatment specifically involves holding the temperature at 500℃~600℃ for 2.5~3.5 hours; (the optimal parameter for high-temperature treatment is holding the temperature at 550℃ for 3 hours). In step 3, the rotation speed of the strip sample 2 is not less than 300 rpm, and the lateral movement speed of the flame gun is less than 200 mm / s.

[0046] In step 2, the specific operation of installing the strip sample 2 includes: loosening the four clamping screws 14 on the rotary clamp 3, placing the strip sample 2 in the middle position between the movable clamping block 13 and the fixed block 15 of the rotary clamp 3, so that the lower end face of the strip sample 2 is in contact with the bottom of the groove of the rotary clamp 3, the length of the clamped part of the strip sample 2 is the same as the height h1 of the movable clamping block 13, the exposed part is h2, and tightening the four clamping screws 14 with a small force until the strip sample 2 does not wobble.

[0047] Example 3 Based on Example 1 or 2, the method of batch spraying strip-shaped samples with a fully encapsulated coating is further specified, and the performance of Example 3 after the specification is even better.

[0048] A method for batch spraying a full-coverage coating onto strip-shaped samples includes the following steps: a. In order to reduce the stress concentration in the coating caused by the sharp edges and corners of the sample shape, which would reduce the performance, and because the coating on the sharp edges and corners is easily crushed by the fixture during the coating preparation process, the edges and sharp corners of the head end face of all strip samples are rounded. The rounding size of the edges is R0.5, and the rounding size of the sharp corners is R1.

[0049] b. Place the chamfered sample in a high-temperature electric furnace and keep it at 550°C for 3 hours to remove the oily organic matter that came into contact with the sample during the chamfering process.

[0050] c. Measure the thickness of the central region over half the length of all samples.

[0051] d. Process a batch of rotary clamps, with 45° chamfers on the upper clamping surfaces of both the movable clamping block and the fixed block to prevent the rotary clamp and strip samples from sticking together after coating application. The movable clamping block has an arc-shaped groove on its clamping surface to improve the alignment and stability of the strip sample installation. The width L and depth S of the arc are determined based on commonly used strip sample dimensions; specifically, L is twice the maximum sample width, and S is 0.8 times the minimum sample thickness. The fixed block is made of high-hardness stainless steel to ensure the rigidity of the rotary clamp, while the movable clamping block is made of lower-hardness magnesium-aluminum alloy, resulting in more stable clamping and reducing damage to the clamping areas of the strip sample during the clamping process.

[0052] e. Install the gear shaft box and speed-regulating motor in a suitable position for spraying, with the front of the gear shaft box facing the spraying robot, and install a rotary clamp on each shaft.

[0053] f. Loosen the four clamping screws on the rotary clamp, place the strip sample in the middle of the rotary clamp, and ensure that the lower end of the strip sample is in contact with the bottom of the groove of the rotary clamp. The length of the clamped part of the strip sample is the same as the height h1 of the movable clamping block, and the exposed part is h2. Tighten the four clamping screws with a small force until the strip sample stops moving. Repeat this step to install the strip sample on all rotary clamps.

[0054] g. Start the speed-regulating motor to make all strip samples rotate at high speed, above 300 rpm.

[0055] h. Position the flame gun perpendicular to the gear shaft box, then tilt it downwards at 30°. The virtual extension line of the flame gun nozzle should intersect the center point of the upper surface of the strip sample at the set spraying distance. Set this height as the initial height of the flame gun. Set the flame gun to move back and forth left and right, gradually moving downwards at a low speed in a "bow" shaped motion trajectory. The left and right lateral movement speed should be less than 200mm / s. The spacing between adjacent lateral trajectories is d, and the number of times the lateral trajectory is repeated is h2 / d+1 rounded up. The left and right boundaries of the trajectory should extend at least 50mm beyond the two outermost samples to ensure that the exposed part of the strip sample is evenly coated with a layer of coating.

[0056] i. Change the horizontal trajectory of the flame gun by h1 / d+1 times, round up, and run the spraying program again to spray a coating layer on the h1 length portion at the top of the strip sample.

[0057] j. Combine the two spraying programs into one program. After running this combined trajectory program a certain number of times, measure the thickness of the central region of half the length of the strip sample and compare it with the initial thickness of the sample measured previously. If the coating thickness reaches half of the designed thickness, stop spraying.

[0058] k. Turn all the strip samples around and install them, then repeat the above spraying procedure and number of passes to complete the uniform preparation of a single full-coverage coating for multiple strip samples.

[0059] 1. Replace the powder hopper of the spraying system, repeat the above spraying procedure and turning operation, and you can complete the uniform preparation of multi-layer full-coverage coating for multiple strip samples, realizing the batch spraying of full-coverage coating for strip samples.

[0060] Furthermore, during the spraying process, the rotation speed of the strip sample must be above 300 rpm, and the lateral movement speed of the flame gun must be less than 200 mm / s.

[0061] In summary, a method for batch spraying a fully encapsulated coating onto strip-shaped samples achieves rapid preparation of such coatings while improving coating consistency and quality. This method is simple to operate and provides formulaic parameter guidelines, offering good versatility for strip-shaped samples of different sizes. It eliminates the need for precise positioning of the spray gun relative to the sample, exhibiting high operational tolerance. Through the structural design and material selection of the clamp, the method achieves stable clamping of the strip-shaped samples with relatively low clamping force, avoiding damage to the sample and coating during the clamping process. Furthermore, this method reduces the frequency of restarting the spraying equipment and changing the powder hopper, extending the service life of both the spraying equipment and the powder hopper.

[0062] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0063] It should be understood that those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A fixture device for batch spraying a coating to fully cover strip-shaped samples, characterized in that: It includes multiple rotary clamps (3) arranged sequentially and at intervals along a straight line, a transmission mechanism and a rotary drive source. The rotary drive source is connected to the multiple rotary clamps (3) through the transmission mechanism. The rotary drive source drives each rotary clamp (3) to rotate through the transmission mechanism.

2. The fixture device for batch spraying a fully encapsulated coating onto strip-shaped samples as described in claim 1, characterized in that: The rotary clamp (3) includes a movable clamping block (13) and a fixed block (15) arranged opposite to each other. The inner surfaces of the movable clamping block (13) and the fixed block (15) are provided with arc-shaped grooves. The arc-shaped grooves are used to accommodate the clamped strip sample (2). The movable clamping block (13) and the fixed block (15) are connected by a clamping screw (14). The clamping screw (14) is arranged on both sides of the arc-shaped groove. The clamping parts on the upper end surfaces of the movable clamping block 13 and the fixed block 15 are both provided with chamfers.

3. The fixture device for batch spraying a fully encapsulated coating onto strip-shaped samples as described in claim 2, characterized in that: The width L of the arc-shaped groove is twice the maximum width of the strip sample, and the depth S of the arc-shaped groove is 0.8 times the minimum thickness of the strip sample.

4. The fixture device for batch spraying a fully encapsulated coating onto strip-shaped samples as described in claim 2, characterized in that: The chamfer is 40°~50°.

5. The fixture device for batch spraying a fully encapsulated coating onto strip-shaped samples as described in claim 1, characterized in that: The transmission mechanism includes a gear shaft box, which contains multiple straight-insertion rotary rods arranged in parallel along a straight line. The two ends of the straight-insertion rotary rods are connected to the gear shaft box through bearings. Each straight-insertion rotary rod is equipped with a gear, and the gears on adjacent straight-insertion rotary rods mesh with each other. The upper end of each straight-insertion rotary rod is connected to the corresponding rotary rod clamp (3). One of the through-hole rotary rods serves as the active through-hole rotary rod, while the other through-hole rotary rods serve as the driven through-hole rotary rods. The lower end of the active through-hole rotary rod passes through the gear shaft box and connects to the rotary drive source.

6. The fixture device for batch spraying a fully encapsulated coating onto strip-shaped samples as described in claim 5, characterized in that: The rotary drive source includes a speed-regulating motor, the output shaft of which is connected to an active direct-insertion rotary rod via a coupling; Each straight-insertion swivel is connected to a rotating seat at its upper end. The rotating seat is located outside the gear shaft box (4). Each swivel clamp (3) is connected to the corresponding rotating seat by a rotating shaft. A dustproof ring is provided between the rotating seat and the gear shaft box (4).

7. A method for batch spraying a fully encapsulated coating onto strip-shaped samples using the fixture device described in claim 1, characterized in that: Includes the following steps: Step 1: Round off the edges and sharp corners of the head of the strip sample, and then perform high-temperature heat treatment on the strip sample after rounding off the corners to remove the organic matter adhering to the surface. Step 2: Install multiple strip-shaped samples on each of the rotating rod clamps (3) of the clamping device, so that the strip-shaped samples (2) are arranged in a straight line; Step 3: Start the rotation drive source to drive each strip sample (2) to rotate synchronously through the clamping device; Step 4: Adjust the angle and initial height of the spraying device so that the spraying path of the spraying device covers the exposed part of the strip sample to be sprayed. The spraying device moves along a preset trajectory and performs spraying; Step 5: When the thickness of a single coating reaches half of the designed thickness, stop spraying, turn all strip samples (2) around and install them, and repeat the spraying procedure and number of passes of steps 3-4 to complete the uniform preparation of a single full-coverage coating. Step 6: If a multi-layer full-coverage coating is required, replace the powder hopper of the spraying system and repeat the operations of steps 3-5 to complete the uniform preparation of the multi-layer full-coverage coating.

8. The method for batch spraying a full-coverage coating onto strip-shaped samples as described in claim 7, characterized in that: In step 4, the preset trajectory is a "bow" shaped downward or upward movement trajectory, and the preset trajectory is at least two sets of sub-trajectories covering different areas of the strip sample; the two sub-trajectories respectively cover the spraying area of ​​the exposed part of the strip sample and the spraying area of ​​the part of the strip sample that will be turned around and clamped, and the left and right boundaries of the running trajectory extend beyond the two outermost strip samples (2); when spraying the two sub-trajectories, only half the thickness of a single coating is sprayed.

9. The method for batch spraying a full-coverage coating onto strip-shaped samples as described in claim 8, characterized in that: The spraying device includes a flame spray gun (1); in step 4, the specific process of adjusting the angle and initial height of the spraying device is as follows: The flame gun nozzle is tilted downwards and positioned on one side of a batch of strip-shaped samples. The initial height of the flame gun is such that the virtual extension line of the nozzle intersects the center point of the upper surface of the strip-shaped sample at the set spraying distance.

10. The method for batch spraying a full-coverage coating onto strip-shaped samples as described in claim 8, characterized in that: In step 1, the fillet radius of the edges is R0.5, and the fillet radius of the sharp corners is R1. The high-temperature treatment specifically involves holding the temperature at 500℃~600℃ for 2.5~3.5 hours. In step 3, the rotation speed of the strip sample (2) is not less than 300 rpm, and the speed of the flame gun moving left and right is less than 200 mm / s.

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