A pipe workpiece cold-heat spraying comprehensive coating operation device and working method

Abstract

A kind of pipe workpiece cold-hot spray integrated coating operation equipment and working method, belong to coating technical field, using high-temperature spraying device on the first surface of workpiece sprays first coating, simultaneously, using low-temperature spraying device on the second surface of workpiece opposite to the first surface sprays second coating;When first coating and second coating are simultaneously sprayed to the two surfaces of workpiece, temperature detection device is used to continuously detect the temperature of workpiece, and the temperature value of workpiece detected by temperature detection device is used to control the operation of high-temperature spraying device and low-temperature spraying device by controller, so that low-temperature spraying device carries out low-temperature spraying operation within specified temperature range.The present application coordinates the cold-hot spray combined operation on the opposite two surfaces by continuous temperature detection and double-sided spraying control of workpiece, especially the preheating effect brought by high-temperature spraying of one surface enables low-temperature spraying of the opposite surface to be carried out under the premise of meeting process standard, and the preparation procedure of special product is optimized.

Description

Technical Field

[0001] This invention belongs to the field of coating technology, and in particular relates to a cold-hot spray integrated coating operation equipment and working method for pipe workpieces. Background Technology

[0002] Depending on the usage requirements or technical requirements (such as different requirements for strength, corrosion resistance, etc.), different coatings are often sprayed on the two opposite surfaces of a workpiece. Taking the preparation of a pipe workpiece with a high melting point corrosion-resistant metal layer sprayed on one surface and a low melting point corrosion-resistant metal layer sprayed on the opposite surface as an example, the preparation process is generally to first spray a high melting point corrosion-resistant metal layer on one surface and then spray a low melting point corrosion-resistant metal layer on the opposite surface.

[0003] In the above process, it is usually not easy to improve the preparation efficiency or reduce unnecessary preheating times by spraying different coatings on two opposite surfaces of the workpiece at the same time, especially when the melting points of the coatings are different. This is because many products require thicker high-melting-point coatings. During the process of spraying a high-melting-point coating on one surface, the continuous heating of the workpiece will cause the temperature of the opposite surface to rise to a level that seriously affects the spraying or adhesion of the low-melting-point coating. Summary of the Invention

[0004] Based on the above problems, the present invention provides a cold-hot spraying integrated coating equipment and working method for tubular workpieces. By continuously detecting the temperature of the workpiece and controlling the double-sided spraying, the cold-hot spraying combined operation on two opposing surfaces is coordinated, shortening the working time and reducing unnecessary preheating times for spraying.

[0005] The objective of this invention is achieved through the following technical solutions.

[0006] A combined cold-hot spray coating equipment for tubular workpieces includes: A high-temperature spraying device is used to spray a first coating onto the first surface of a workpiece; A low-temperature spraying device is used to spray a second coating on a second surface of a workpiece opposite to the first surface when a high-temperature spraying device sprays a first coating on a first surface of the workpiece. A temperature detection device is used to continuously detect the temperature of a workpiece when a first coating and a second coating are simultaneously sprayed onto two surfaces of the workpiece. The controller is used to control the operation of the high-temperature spraying device and the low-temperature spraying device based on the temperature value of the workpiece detected by the temperature detection device, so that the low-temperature spraying device can perform low-temperature spraying operations within the specified temperature range.

[0007] As described above, the high-temperature spraying device is used to spray metal coatings or metal-based composite material coatings.

[0008] As described above, the low-temperature spraying device is used to spray inorganic non-metallic coatings, organic coatings, metallic coatings, or metal-based composite material coatings.

[0009] In the above-described operating equipment, the temperature detection device is a contact temperature sensor or a non-contact thermometer.

[0010] A method for combined cold and hot spray coating of tubular workpieces includes the following steps: A first coating is applied to the first surface of the workpiece using a high-temperature spraying device, while a second coating is applied to the second surface of the workpiece opposite to the first surface using a low-temperature spraying device. When the first and second coatings are applied to both surfaces of a workpiece simultaneously, a temperature detection device continuously monitors the workpiece temperature. The controller controls the operation of the high-temperature spraying device and the low-temperature spraying device based on the temperature value of the workpiece detected by the temperature detection device, so that the low-temperature spraying device performs low-temperature spraying operations within a specified temperature range.

[0011] As described above, the temperature detection method of the temperature detection device is either direct detection or indirect detection.

[0012] As described above, the temperature detection device detects the surface and / or sidewall temperature of the workpiece.

[0013] As described above, the controller controls the order in which the two spraying operations are completed by controlling the start time of the low-temperature spraying.

[0014] As described above, the first coating is a high-melting-point metal layer, and the second coating is a low-melting-point metal layer. Beneficial effects

[0015] The cold-hot spraying integrated coating equipment and working method for tubular workpieces provided by this invention coordinates the combined cold-hot spraying operation on two opposing surfaces by continuously detecting the temperature of the workpiece and controlling double-sided spraying. This shortens the working time and reduces unnecessary preheating times for spraying. In particular, by utilizing the preheating effect brought about by high-temperature spraying on one surface, the low-temperature spraying on the other side can be carried out under the premise of meeting process standards. This combines spraying processes that are not easy to merge, and optimizes the preparation process of special products. Attached Figure Description

[0016] Figure 1 This is a schematic diagram illustrating the working principle of the cold-hot spray integrated coating equipment and method for tubular workpieces provided in this embodiment of the invention.

[0017] The components corresponding to the various reference numerals in the figure are: 1-Workpiece, 2-High-temperature spraying device, 3-Low-temperature spraying device, 4-Temperature detection device, 5-Controller. Detailed Implementation

[0018] Exemplary embodiments of this disclosure will now be described in more detail with reference to the accompanying drawings. It should be noted that these embodiments are provided to enable a more thorough understanding of this disclosure and to fully convey the scope of this disclosure to those skilled in the art. This disclosure can be implemented in various forms and should not be limited to the embodiments set forth herein. Example

[0019] A combined cold-hot spray coating equipment for tubular workpieces includes: The high-temperature spraying device 2 is used to spray a first coating onto the first surface of the workpiece 1.

[0020] The low-temperature spraying device 3 is used to spray a second coating on the second surface of the workpiece 1 opposite to the first surface when the high-temperature spraying device 2 sprays a first coating on the first surface of the workpiece 1.

[0021] Temperature detection device 4 is used to continuously detect the temperature of workpiece 1 when the first coating and the second coating are sprayed on both surfaces of workpiece 1 at the same time.

[0022] Depending on the requirements, the temperature detection device 4 can be a contact temperature sensor or a non-contact thermometer. Furthermore, the temperature detection method of the temperature detection device 4 can be direct or indirect detection.

[0023] Depending on the type and shape of the workpiece, the temperature detection device 4 can detect the surface and / or sidewall temperature of the workpiece 1.

[0024] The controller 5 is used to control the operation of the high-temperature spraying device 2 and the low-temperature spraying device 3 according to the temperature value of the workpiece 1 detected by the temperature detection device 4, so that the low-temperature spraying device 3 can perform low-temperature spraying operations within the specified temperature range.

[0025] The working method is as follows: a high-temperature spraying device 2 is used to spray a first coating on the first surface of the workpiece 1, and at the same time, a low-temperature spraying device 3 is used to spray a second coating on the second surface of the workpiece 1 opposite to the first surface. When the first coating and the second coating are sprayed on the two surfaces of the workpiece 1 at the same time, a temperature detection device 4 is used to continuously detect the temperature of the workpiece 1. The controller 5 controls the operation of the high-temperature spraying device 2 and the low-temperature spraying device 3 according to the temperature value of the workpiece 1 detected by the temperature detection device 4, so that the low-temperature spraying device 3 performs low-temperature spraying operation within the specified temperature range.

[0026] During this process, the controller 5 can optimize and control the spraying time, pause frequency, switching and coordination of the two spraying methods according to any technical needs of the production cycle or operation. For example, the controller 5 can control the order in which the two spraying operations are completed first by controlling the start time of low temperature spraying.

[0027] This embodiment is particularly suitable for spraying different coatings with high and low melting points onto two opposite surfaces of a workpiece, depending on the different usage requirements or technical requirements (such as different requirements for strength, corrosion resistance, etc.). For example, it can be used to prepare a workpiece with a high melting point corrosion-resistant metal layer sprayed on one surface and a low melting point corrosion-resistant metal layer sprayed on the other surface. In this case, the present invention can coordinate the combined cold-hot spraying operation on two opposite surfaces by continuously monitoring the temperature of the workpiece and controlling the double-sided spraying. The preheating effect brought about by the high temperature spraying on one surface allows the low temperature spraying on the opposite side to be carried out under the premise of meeting the process standards. This combines spraying processes that are not easy to combine and optimizes the preparation process of special products.

[0028] Based on the principles and application scenarios described above, the high-temperature spraying device 2 and the low-temperature spraying device 3 in this invention are particularly suitable for spraying metal coatings or similar metal-based composite material coatings. However, the low-temperature spraying device 3 is also suitable for spraying inorganic non-metallic coatings, organic coatings, and other coatings that are sprayed under low-temperature conditions.

[0029] It should be noted that all high-temperature spraying, low-temperature spraying, or high melting point and low melting point mentioned in this invention should be interpreted as relatively high and low concepts, and should not be interpreted as absolute concepts with a specific temperature or melting point as the dividing line. This is because, at least for the low-temperature spraying mentioned in this invention, it can include room temperature operation that does not require clamping at any temperature. Therefore, the cold-hot spraying of this invention should also be interpreted as relatively cold and hot.

[0030] like Figure 1 As shown, this embodiment uses examples to further illustrate the implementation details of the technical solution provided by the present invention and its application effects in a specific field based on a specific application scenario.

[0031] This embodiment takes the preparation of an iron conveying pipe (cast iron pipe or steel pipe) for the purpose of conveying thermal media, with an outer surface thermally sprayed with a corrosion-resistant metal layer, an inner surface sprayed with zinc and coated with epoxy resin as an example. The conventional preparation process is: thermally spraying a corrosion-resistant metal layer on the outer surface → spraying zinc on the inner surface → coating the inner surface with epoxy resin.

[0032] This embodiment focuses on a scheme involving thermal spraying of a corrosion-resistant metal layer on the outer surface and zinc spraying on the inner surface. In this scheme, the thermal spraying of the corrosion-resistant metal layer on the outer surface is not carried out simultaneously with the zinc spraying process on the inner surface. This is because the corrosion-resistant metal layer thermally sprayed on the outer surface is usually made of iron-based alloys such as stainless steel or nickel-based alloys, which have high melting points, and many products require a thick corrosion-resistant layer. During the thermal spraying of this type of coating on the outer surface, the temperature of the inner pipe will rise to over 200°C due to continuous heating of the conveying pipeline. However, the operating instructions for the zinc spraying process require a temperature of 160-180°C. Therefore, it is not possible to carry out the combined operation of thermal spraying of the corrosion-resistant metal layer on the outer surface and zinc spraying on the inner surface on a multi-station spraying unit. The zinc spraying on the inner surface can only be carried out after the thermal spraying of the corrosion-resistant metal layer on the outer surface is completed and the temperature drops to a reasonable range, resulting in a long waiting time.

[0033] Combination Figure 1 As shown in the principle, the cold-hot spraying integrated coating equipment and working method for pipe workpieces in this embodiment uses a high-temperature spraying device 2 to thermally spray a corrosion-resistant metal layer on the outer surface of the workpiece 1 (transport pipeline), and a low-temperature spraying device 3 (zinc spraying machine) to spray zinc on the inner surface of the workpiece 1. The operation of thermally spraying a corrosion-resistant metal layer on the outer surface and spraying zinc on the inner surface is carried out simultaneously.

[0034] The above process is carried out using a dual-station spraying equipment in the workshop. The workpiece 1 rotates on a rotating support, and the spray bar and nozzle of the low-temperature spraying device 3 can extend into the interior of the workpiece 1 to perform zinc spraying on the inner surface. The high-temperature spraying device 2 can also move back and forth on one side of the workpiece 1 to perform thermal spraying on the outer surface of the workpiece 1. The corrosion-resistant metal layer thermally sprayed on the outer surface is stainless steel or other iron-based alloys or nickel-based alloys.

[0035] The improvement in this embodiment is that a temperature detection device 4 is used to continuously detect the temperature of the workpiece 1, and the operation of the high-temperature spraying device 2 and the low-temperature spraying device 3 is controlled according to the detected temperature value of the workpiece 1, so that the low-temperature spraying device 3 performs zinc spraying operation within a specified temperature range, such as 160-180℃ (which can be changed).

[0036] The following provides a more specific example illustrating the procedural steps of the above solution: Step 1: A corrosion-resistant metal layer is sprayed onto the outer surface of workpiece 1 using a high-temperature spraying device 2, and a temperature detection device 4 continuously monitors the temperature of workpiece 1.

[0037] Since the corrosion-resistant metal layer sprayed on the outer surface of workpiece 1 is relatively thick, the time required for spraying the corrosion-resistant metal layer on the outer surface of workpiece 1 is longer than the time required for spraying zinc on the inner surface of workpiece 1. Therefore, before starting the zinc spraying procedure of this embodiment, or in other words, before step 1, the high-temperature spraying device has already sprayed a corrosion-resistant metal layer of a certain thickness on the outer surface of the conveying pipe. This process can also detect and display the temperature of workpiece 1. However, since the zinc spraying procedure has not started, even if the temperature of the conveying pipe continues to be higher than 200°C, it is not necessary to interfere with the thermal spraying procedure. It is only necessary to ensure that workpiece 1 is cooled to a suitable temperature before preparing to start the zinc spraying procedure.

[0038] Step 2, following Step 1, when the temperature of workpiece 1 rises to the first temperature value t1 within the specified temperature range of the zinc spraying operation, the low-temperature spraying device 3 begins to spray zinc on the inner surface of workpiece 1, and the temperature detection device 4 continuously detects the temperature of workpiece 1.

[0039] Step 3: When the temperature of workpiece 1 rises to the second temperature value t2 within the specified temperature range of the zinc spraying operation or the third temperature value t3 which just exceeds the maximum value of the specified temperature range of the zinc spraying operation, the high-temperature spraying device 2 stops spraying on the outer surface of workpiece 1, and the low-temperature spraying device 3 continues to spray zinc on the inner surface of workpiece 1.

[0040] Step 4: When the temperature of workpiece 1 drops to the fourth temperature value t4 within the specified temperature range of the zinc spraying operation or the fifth temperature value t5 which is just below the minimum value of the specified temperature range of the zinc spraying operation, restart the high-temperature spraying device 2 to spray the workpiece 1 on the outer surface, and the low-temperature spraying device 3 continues to spray zinc on the inner surface of workpiece 1.

[0041] Although the fourth temperature value t4 mentioned in this step can be the same as the first temperature value t1 in step 2, the two can also be different. For example, the fourth temperature value t4 may be slightly higher than the first temperature value t1 (the difference may be 2℃-5℃).

[0042] Step 5: Repeat steps 3 and 4 until the high-temperature spraying device 2 first completes the spraying of a corrosion-resistant metal layer on the outer surface of the workpiece 1, or the low-temperature spraying device 3 first completes the spraying of zinc on the inner surface of the workpiece 1, or the high-temperature spraying device 2 and the low-temperature spraying device 3 complete the spraying operation simultaneously.

[0043] As mentioned earlier, the order in which the two spraying operations are completed can be controlled by controlling the start time of zinc spraying. Among the three sequences mentioned above, the ideal implementation condition is that the high-temperature spraying device 2 and the low-temperature spraying device 3 complete the spraying operation simultaneously. However, there is an error between the theoretical and actual time consumption when intervening in the spraying operation procedure based on temperature detection. Therefore, it is easier to meet the expected results by setting the high-temperature spraying device 2 to complete the spraying of the corrosion-resistant metal layer on the outer surface of the workpiece 1 a certain time in advance, or by setting the low-temperature spraying device 3 to complete the spraying of zinc on the inner surface of the workpiece 1 a certain time in advance. It is only necessary to ensure that the time is short enough so that the temperature of the workpiece 1 will not drop below the specified temperature range during the remaining zinc spraying period after the thermal spraying procedure is completed, or the temperature of the workpiece 1 will rise to a level that affects or damages the sprayed zinc coating during the remaining thermal spraying period after the zinc spraying procedure is completed.

[0044] In this embodiment, the temperature detection device 4 is not limited to... Figure 1 The non-contact temperature measuring instrument shown can also use a contact temperature sensor. Preferably, the temperature detection device 4 measures the side wall temperature of the workpiece 1. The side wall of the workpiece 1 is not directly affected by the spraying material, so the temperature response is accurate. The temperature detection method can be direct detection or indirect detection. Indirect detection can be to indirectly determine the temperature of the workpiece 1 by indirectly detecting the temperature of other components (such as the rotating chuck) that are in direct contact with the workpiece 1.

[0045] In this embodiment, the high-temperature spraying device 2, the low-temperature spraying device 3, and the temperature detection device 4 are all communicatively connected to the controller 5. The high-temperature spraying device 2 and the low-temperature spraying device 3 (including a rotary motor not shown in the figure) are electrically connected to the controller 5. The temperature detection device 4 can be electrically or wirelessly connected to the controller 5. The controller 5 controls the operation program of the high-temperature spraying device 2 and the low-temperature spraying device 3 based on the temperature information detected by the temperature detection device 4.

[0046] After completing the above procedures, according to the technical requirements of the conveying pipeline to be prepared, after spraying zinc on the inner surface of workpiece 1, epoxy resin is also sprayed on the zinc coating surface.

[0047] This embodiment represents the application of the present invention in a special product manufacturing process. By continuously monitoring the temperature of the inner tube of the conveying pipeline and controlling the double-sided spraying operation, the combined operation of thermal spraying of the corrosion-resistant metal layer on the outer surface and zinc spraying on the inner surface is coordinated. This allows the zinc spraying operation to be carried out under the premise of meeting process standards, merging two processes that are not easily combined, thus shortening the working time. Since zinc spraying alone also requires preheating of the workpiece, this embodiment also reduces unnecessary preheating times for spraying, thus optimizing the overall manufacturing process of conveying pipeline products, especially corrosion-resistant pipeline products used in the field of heat conveying.

[0048] The above description is merely a preferred embodiment of the present invention, and the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A cold-hot spraying integrated coating equipment for pipe-type workpieces, wherein the pipe-type workpieces are iron conveying pipes used for transporting thermal media, and the cold-hot spraying integrated coating operation involves spraying different layers with relatively low melting points and high melting points, characterized in that... include: High-temperature spraying device (2) is used to spray a high-melting-point metal layer on the outer surface of tubular workpieces, wherein the high-melting-point metal layer is a corrosion-resistant metal layer; The low-temperature spraying device (3) is used to spray a low-melting-point metal layer on the inner surface of the tubular workpiece opposite to the outer surface when the high-temperature spraying device (2) sprays a high-melting-point metal layer on the outer surface of the tubular workpiece. The low-melting-point metal layer is zinc. Temperature detection device (4) is used to continuously detect the temperature of tubular workpieces; The controller (5) is used to control the operation of the high-temperature spraying device (2) and the low-temperature spraying device (3) according to the temperature value of the pipe workpiece detected by the temperature detection device (4), so that the low-temperature spraying device (3) can carry out low-temperature spraying operation within the specified temperature range. The comprehensive painting operation steps are as follows: Step 1: Use a high-temperature spraying device (2) to spray a corrosion-resistant metal layer onto the outer surface of the tubular workpiece; Step 2: When the temperature of the tubular workpiece rises to the first temperature value t1 within the specified temperature range of the zinc spraying operation, the low-temperature spraying device (3) is used to spray zinc on the inner surface of the tubular workpiece. Step 3: When the temperature of the tubular workpiece rises to the second temperature value t2 within the specified temperature range of the zinc spraying operation or the third temperature value t3 which just exceeds the maximum value of the specified temperature range of the zinc spraying operation, the high-temperature spraying device (2) stops spraying the outer surface of the tubular workpiece, and the low-temperature spraying device (3) continues to spray zinc on the inner surface of the tubular workpiece. Step 4: When the temperature of the tubular workpiece drops to the fourth temperature value t4 within the specified temperature range of the zinc spraying operation or the fifth temperature value t5 which is just below the minimum value of the specified temperature range of the zinc spraying operation, restart the high-temperature spraying device (2) to spray the outer surface of the tubular workpiece, and the low-temperature spraying device (3) continues to spray zinc on the inner surface of the tubular workpiece, wherein the fourth temperature value t4 is the same as or different from the first temperature value t1. Step 5, repeat steps 3 and 4 until the high-temperature spraying device (2) first completes the spraying of a corrosion-resistant metal layer on the outer surface of the pipe workpiece, or the low-temperature spraying device (3) first completes the spraying of zinc on the inner surface of the pipe workpiece, or the high-temperature spraying device (2) and the low-temperature spraying device (3) complete the spraying operation simultaneously.

2. The operating equipment according to claim 1, characterized in that, The temperature detection device (4) is a contact temperature sensor or a non-contact thermometer.

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