A surface treatment device for valve castings

Abstract

The present invention relates to the field related to the processing of valve castings, and particularly to a surface treatment device for valve castings. The treatment process includes the following steps: S1 Surface cleaning: Clean the surface of the valve casting using an alkaline cleaner; S2 Pickling and rust removal treatment: Use an acidic solution to pickle the surface of the casting to remove the oxide scale and other impurities; S3 Surface roughness treatment: Perform grinding and processing through a grinding device; S4 Phosphating treatment: Perform phosphating treatment on the ground casting to form a phosphating film; S5 Primer coating: Apply a layer of polyurethane primer before spraying. The surface treatment process of the present invention can ensure that the surface of the valve casting is smoother by adopting processes such as pickling, grinding, phosphating, and primer coating, and improves the adhesion and corrosion resistance of the metal surface, providing a better foundation for subsequent coatings, thereby realizing more efficient treatment of the surface of the valve casting.

Description

Technical Field

[0001] The present invention relates to the field related to the processing of valve castings, and particularly to a surface treatment device for valve castings. Background Art

[0002] A valve is a control component in a fluid transportation system and has functions such as cut-off, regulation, diversion, prevention of backflow, pressure stabilization, flow splitting, or overflow pressure relief. Valves can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil products, liquid metals, and radioactive media. Therefore, before the valve leaves the factory, it is necessary to perform a spraying operation on the valve to improve the service life of the valve. Before the valve is subjected to spraying processing, it is necessary to process the surface of the valve in advance, otherwise it will affect the spraying effect and quality. The traditional treatment process usually uses simple cleaning and other methods for treatment, and the treatment effect is poor. When grinding the surface of the valve casting, the grinding head is not convenient to adjust, the degree of freedom during grinding is insufficient, and at the same time, it is not convenient to adjust the valve after it is fixed. Therefore, the quality of the surface grinding of the valve casting is relatively low, affecting the grinding accuracy, making the surface treatment of the valve incomplete, and thus affecting the subsequent spraying work. Summary of the Invention

[0003] Therefore, the present invention provides a surface treatment device for valve castings to solve the above technical problems.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions: A surface treatment device for valve castings, and the treatment process includes the following steps:

[0005] S1 Surface cleaning: First, use an alkaline cleaner to clean the surface of the valve casting to remove oil stains and dust on the surface;

[0006] S2 Pickling and rust removal treatment: For castings with rust, use an acidic solution to pickle the surface of the casting to remove the oxide scale and other impurities;

[0007] S3 Surface roughness treatment: Grind and process through a grinding device to adjust the surface roughness;

[0008] S4 Phosphating treatment: After phosphating the castings after grinding treatment, form a phosphating film on the surface of the castings;

[0009] S5 Primer coating: Finally, before performing the spraying operation, apply another layer of polyurethane primer to complete the surface treatment work.

[0010] Preferably, in the step S1, the alkaline cleaner is one of trisodium phosphate, sodium hydroxide, potassium dihydrogen phosphate, and disodium hydrogen phosphate.

[0011] Preferably, in step S2, the acidic solution is one of hydrochloric acid, nitric acid or phosphoric acid for pickling and rust removal, the pickling time is 15-35 minutes, and the concentration of the acidic solution is 5%-20%.

[0012] Preferably, the phosphating treatment in step S4 is performed by phosphate phosphating or zinc phosphating.

[0013] Preferably, the grinding device in step S3 comprises a base, a stand, a first motor, a transmission adjustment mechanism, a grinding head, a positioning adjustment mechanism and a positioning piece, the base is provided with a stand at the rear, the stand is provided with the first motor, the stand is provided with a transmission adjustment mechanism at the front end of the stand, the grinding head is provided with a front bottom of the transmission adjustment mechanism, the base is provided with a positioning adjustment mechanism at the front, and the positioning adjustment mechanism is provided with a positioning piece for fixing the valve casting;

[0014] The transmission adjustment mechanism includes an adjustment component and a synchronous transmission component. One end of the adjustment component is connected to the stand, and a grinding head is installed at the bottom of the other end. The synchronous transmission component is installed on the adjustment component, and the first motor is transmitted to the grinding head through the synchronous transmission component.

[0015] Preferably, the positioning assembly includes a first swing arm, a first joint, a second joint, the second swing arm, a third joint, a mounting seat and a first handle, a first joint is provided at one end of the first swing arm, and is rotatably connected to the front end of the stand through the first joint, a second joint is provided at the other end of the first swing arm, and is rotatably connected to the third joint provided at one end of the second swing arm through the second joint, a mounting seat is installed at the other end of the second swing arm, and a first handle is provided on one side of the mounting seat.

[0016] Preferably, the synchronous transmission assembly includes a first transmission shaft, a first pulley, a first belt, a second pulley, a second transmission shaft, a third pulley, a second belt, a fourth pulley and a third transmission shaft, the first transmission shaft passes through the stand and the first joint and is connected to the output end of the first motor at one end, and is connected to the middle of the first pulley at the other end, the outer side of the first pulley is connected to the second pulley through the first belt, the middle part of the second pulley is connected to the second transmission shaft, the second transmission shaft passes through the second joint and the third joint and is connected to the middle part of the third pulley, the outer side of the third pulley is connected to the fourth pulley through the second belt, the middle part of the fourth pulley is connected to the third transmission shaft, and the third transmission shaft passes through the mounting seat and is connected to the grinding head.

[0017] Preferably, the positioning and adjusting mechanism includes a moving seat, a slide rail, a threaded rod, a second motor, a grinding table and a side adjusting component. A slideway provided on one side of the moving seat is slidably connected to the slide rail installed on the base. A slider provided on the other side of the moving seat is in threaded cooperation with the threaded rod. The two ends of the threaded rod are installed on the base through supports. A second motor is installed on the support at the rear of the threaded rod, and the output end of the second motor is connected to one end of the threaded rod through a coupling. The grinding table is horizontally slidably provided on the upper end of the moving seat. A positioning member is installed on the upper end of the grinding table. A side adjusting component is provided on one side of the moving seat. The side adjusting component is installed on the base and is connected to one side of the grinding table.

[0018] Preferably, the side adjusting component includes a first fixing plate, a first sliding groove, an adjusting plate, a sliding rod, a rotating rod, a second fixing plate, a sliding frame, a sliding column, a connecting plate, a second sliding groove and a second handle. The first fixing plate and the second fixing plate are symmetrically installed on the base. An arc-shaped first sliding groove is provided on the first fixing plate. The sliding rod provided at one end of the adjusting plate is slidably matched with the first sliding groove. The other end of the adjusting plate is rotatably connected to the second fixing plate through a rotating rod. A sliding frame is slidably connected to the adjusting plate. A sliding column with a second handle is installed on the sliding frame. The sliding column is slidably connected to the second sliding groove provided on the connecting plate. The connecting plate is connected to one side of the grinding table.

[0019] Preferably, a pointer is provided on one end of the adjusting plate facing the first fixing plate and corresponds to the scale provided on the first fixing plate.

[0020] The beneficial effects of the present invention:

[0021] The surface treatment process of the present invention can ensure that the surface of the valve casting is smoother by adopting processes such as pickling, grinding, phosphating and primer coating, and improves the adhesion and corrosion resistance of the metal surface, providing a better foundation for the subsequent coating, so as to realize more efficient treatment of the surface of the valve casting.

[0022] The grinding device of the present invention is provided with a transmission position adjustment mechanism, which includes a position adjustment component and a synchronous transmission component. The position adjustment component includes two sets of swing arms that are rotatably connected to each other, which can flexibly adjust the grinding angle position of the grinding head. Its adjustment position can be manually adjusted to ensure that the grinding position better adapts to the size of the valve casting, improve the grinding efficiency. At the same time, the synchronous transmission component is driven by two sets of pulley groups to make the transmission of the grinding head unaffected when the position adjustment component adjusts the position, so that the position adjustment component can be better adjusted. The grinding device of the present invention is also provided with a positioning adjustment mechanism. Driven by the second motor, the threaded rod rotates to drive the moving seat to move, and the side adjustment component provided on one side of the base can make the grinding table move horizontally on the moving seat according to the set angle, that is, while the moving seat moves forward and backward, the grinding table can synchronously move horizontally according to the set angle, so as to better adjust the position of the valve casting on the grinding table to improve the grinding efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is the processing flowchart of the present invention;

[0024] Figure 2 is the structural schematic diagram of the grinding device of the present invention;

[0025] Figure 3 is the installation schematic diagram of the transmission position adjustment mechanism of the present invention;

[0026] Figure 4 is the three-dimensional structural schematic diagram of the transmission position adjustment mechanism of the present invention;

[0027] Figure 5 is the side view structural schematic diagram of the transmission position adjustment mechanism of the present invention;

[0028] Figure 6 is the structural schematic diagram of the positioning adjustment mechanism of the present invention;

[0029] Figure 7 is the structural schematic diagram of the side adjustment component of the present invention;

[0030] Figure 8It is a top view structural schematic diagram of the side adjustment component of the present invention. Among them: base - 1, vertical frame - 2, first motor - 3, transmission and position adjustment mechanism - 4, grinding head - 5, positioning and adjustment mechanism - 6, positioning part - 7, position adjustment component - 41, synchronous transmission component - 42, first swing arm - 411, first joint - 412, second joint - 413, second swing arm - 414, third joint - 415, mounting seat - 416, first handle - 417, first transmission shaft - 421, first pulley - 422, first belt - 423, second pulley - 424, second transmission shaft - 425, third pulley - 426, second belt - 427, fourth pulley - 428, third transmission shaft - 429, moving seat - 61, slide rail - 62, threaded rod - 63, second motor - 64, grinding table - 65, side adjustment component - 66, first fixing plate - 661, first chute - 662, adjustment plate - 663, sliding rod - 664, rotating rod - 665, second fixing plate - 666, sliding frame - 667, sliding column - 668, connecting plate - 669, second chute - 6610, second handle - 6611, pointer - 6601, scale - 6602. Detailed implementation manners

[0031] In order to further explain the technical solution of the present invention, it will be elaborated in detail through specific embodiments below.

[0032] As Figure 1 shown, the present invention provides a surface treatment device for valve castings, and the treatment process includes the following steps:

[0033] S1 Surface cleaning: First, use an alkaline cleaner to clean the surface of the valve casting to remove oil stains and dust on the surface, ensuring that the surface of the casting is clean. The alkaline cleaner is one of trisodium phosphate, sodium hydroxide, potassium dihydrogen phosphate, and disodium hydrogen phosphate to ensure that the coating can firmly adhere to the surface.

[0034] S2 Pickling and rust removal treatment: For castings with rust, use an acidic solution to pickle the surface of the casting to remove oxide scales and other impurities. The acidic solution is one of hydrochloric acid, nitric acid, or phosphoric acid for pickling and rust removal treatment. The pickling time is 15 - 35 min, and the concentration of the acidic solution is 5% - 20%. Ensure that the surface is smooth, enhance the cleanliness and roughness of the surface, which is beneficial to the adhesion of the coating. Control the pickling time and concentration during pickling to avoid damage to the metal surface.

[0035] S3 Surface roughness treatment: Grind and process through a grinding device to adjust the surface roughness to improve the adhesion of the coating.

[0036] S4 Phosphating Treatment: After grinding the castings, a phosphating treatment is carried out to form a phosphating film on the surface of the castings. The phosphating treatment is carried out using either phosphate phosphating or zinc phosphating to improve the adhesion and corrosion resistance of the metal surface and provide a better foundation for the subsequent coating;

[0037] S5 Primer Coating: Finally, before the spraying operation, a layer of polyurethane primer is coated to complete the surface treatment work, so as to increase the adhesion and corrosion resistance of the surface.

[0038] As Figure 2 shown, in this embodiment, the grinding device in step S3 includes a base 1, a vertical frame 2, a first motor 3, a transmission and position adjustment mechanism 4, a grinding head 5, a positioning and adjustment mechanism 6, and a positioning part 7. A vertical frame 2 is installed at the rear of the base 1, a first motor 3 is installed on the vertical frame 2, a transmission and position adjustment mechanism 4 is installed at the front end of the vertical frame 2, a grinding head 5 is installed at the front bottom of the transmission and position adjustment mechanism 4, a positioning and adjustment mechanism 6 is installed at the front of the base 1, and a positioning part 7 for fixing the valve casting is installed on the positioning and adjustment mechanism 6. The valve is installed on the positioning and adjustment mechanism 6 through the positioning part 7. Then, after the first motor 3 works, it is transmitted through the synchronous transmission component 42 in the transmission and position adjustment mechanism 4 to drive the grinding head 5 to rotate. The surface of the valve is ground by the grinding head 5. During grinding, the position of the grinding head 5 can be adjusted through the position adjustment component 41, and at the same time, the positioning and adjustment mechanism 6 can adjust the positioned valve during the grinding work to improve the grinding efficiency;

[0039] As Figure 3 shown, the transmission and position adjustment mechanism 4 includes a position adjustment component 41 and a synchronous transmission component 42. One end of the position adjustment component 41 is connected to the vertical frame 2, and the grinding head 5 is installed at the bottom of the other end. The synchronous transmission component 42 is installed on the position adjustment component 41, and the first motor 3 is transmitted to the grinding head 5 through the synchronous transmission component 42.

[0040] As Figures 4-5 shown, in this embodiment, the position adjustment component 41 includes a first swing arm 411, a first joint 412, a second joint 413, a second swing arm 414, a third joint 415, a mounting seat 416, and a first handle 417. One end of the first swing arm 411 is provided with a first joint 412 and is rotatably connected to the front end of the vertical frame 2 through the first joint 412. The other end of the first swing arm 411 is provided with a second joint 413 and is rotatably connected to a third joint 415 provided at one end of the second swing arm 414 through the second joint 413. The other end of the second swing arm 414 is installed with a mounting seat 416, and a first handle 417 is provided on one side of the mounting seat 416;

[0041] Specifically, after pulling the first handle 417, the mounting base 416 can be pulled synchronously. Then, the mounting base 416 drives the second swing arm 414. The second swing arm 414 is rotatably connected to the second joint 413 of the first swing arm 411 through the third joint 415, enabling the second swing arm 414 to make a circumferential position adjustment centered on the first swing arm 411. At the same time, the first swing arm 411 is rotatably connected to the vertical frame 2 through the first joint 412, enabling the first swing arm 411 to make a circumferential position adjustment centered on the vertical frame 2.

[0042] As Figures 4-5 shown, in this embodiment, the synchronous transmission assembly 42 includes a first transmission shaft 421, a first pulley 422, a first belt 423, a second pulley 424, a second transmission shaft 425, a third pulley 426, a second belt 427, a fourth pulley 428, and a third transmission shaft 429. The first transmission shaft 421 passes through the vertical frame 2 and the first joint 412, and one end thereof is connected to the output end of the first motor 3, and the other end is connected to the middle of the first pulley 422. The outer side of the first pulley 422 is drivingly connected to the second pulley 424 through the first belt 423. The middle of the second pulley 424 is connected to the second transmission shaft 425. The second transmission shaft 425 passes through the second joint 413 and the third joint 415 and is connected to the middle of the third pulley 426. The outer side of the third pulley 426 is drivingly connected to the fourth pulley 428 through the second belt 427. The middle of the fourth pulley 428 is connected to the third transmission shaft 429. The third transmission shaft 429 passes through the mounting base 416 and is connected to the grinding head 5.

[0043] Specifically, after the first motor 3 operates, its output end drives the first transmission shaft 421 to rotate. Then, the first transmission shaft 421 synchronously drives the first pulley 422 to rotate. The first pulley 422 drives the second pulley 424 to rotate synchronously through the first belt 42. Then, the second pulley 424 drives the second transmission shaft 425 to rotate synchronously. The second transmission shaft 425 synchronously drives the third pulley 426. The third pulley 426 drives the fourth pulley 428 to rotate synchronously through the second belt 427. The fourth pulley 428 drives the third transmission shaft 429 to rotate synchronously. Finally, the third transmission shaft 429 drives the grinding head 5 to rotate.

[0044] As Figure 6As shown in the figure, in this embodiment, the positioning and adjusting mechanism 6 includes a moving seat 61, a slide rail 62, a threaded rod 63, a second motor 64, a grinding table 65 and a side adjusting assembly 66. A slideway provided on one side of the moving seat 61 is slidably connected to the slide rail 62 installed on the base 1. A slider provided on the other side of the moving seat 61 is in threaded engagement with the threaded rod 63. Both ends of the threaded rod 63 are installed on the base 1 through supports. A second motor 64 is installed on the support at the rear of the threaded rod 63, and the output end of the second motor 64 is connected to one end of the threaded rod 63 through a coupling. A grinding table 65 is horizontally slidably arranged on the upper end of the moving seat 61. A protruding track is provided on the upper end of the moving seat 61 and is slidably engaged with a track groove provided at the bottom of the grinding table 65, so that the grinding table 65 can slide horizontally on the moving seat 61 without deviation. A positioning member 7 is installed on the upper end of the grinding table 65. A side adjusting assembly 66 is provided on one side of the moving seat 61. The side adjusting assembly 66 is installed on the base 1 and is connected to one side of the grinding table 65.

[0045] Specifically, after the second motor 64 works, it drives the threaded rod 63 to rotate. After the threaded rod 63 rotates, it drives the slider on one side of the moving seat 61 to move, so that the slideway on the other side of the moving seat 61 slides and moves synchronously on the slide rail 62. Then, the moving seat 61 drives the grinding table 65 at the upper end to move. And the grinding table 65 also moves horizontally on the moving seat 61 under the linkage of the side adjusting assembly 66, so as to move the position of the valve positioned by the positioning member 7.

[0046] As Figures 7-8 shown in the figure, in this embodiment, the side adjusting assembly 66 includes a first fixing plate 661, a first sliding groove 662, an adjusting plate 663, a sliding rod 664, a rotating rod 665, a second fixing plate 666, a sliding frame 667, a sliding column 668, a connecting plate 669, a second sliding groove 6610 and a second handle 6611. The first fixing plate 661 and the second fixing plate 666 are symmetrically installed on the base 1. An arc-shaped first sliding groove 662 is provided on the first fixing plate 661. The sliding rod 664 provided at one end of the adjusting plate 663 is slidably engaged with the first sliding groove 662. The other end of the adjusting plate 663 is rotatably connected to the second fixing plate 666 through the rotating rod 665. A sliding frame 667 is slidably connected to the adjusting plate 663. A sliding column 668 with a second handle 6611 is installed on the sliding frame 667. The sliding column 668 is slidably connected to a second sliding groove 6610 provided on the connecting plate 669. The connecting plate 669 is connected to one side of the grinding table 65. It should be noted that the sliding column 668 is a split structure up and down, that is, the upper and lower two column bodies are respectively located on the upper and lower sides of the connecting plate 669. The middle parts of the upper and lower two column bodies of the sliding column 668 are connected by a screw thread. The upper column body is connected to the second handle 6611. Rotating the second handle 6611 drives the upper column body to rotate, so that the middle screw is loosened or tightened. After loosening, it can slide in the second sliding groove 6610 of the connecting plate 669. After tightening, the connecting plate 669 is clamped by the upper and lower two column bodies.

[0047] One end of the adjusting plate 663 facing the first fixing plate 661 is provided with a pointer 6601, which corresponds to the scale 6602 provided on the first fixing plate 661. The adjusting plate 663 can determine the adjustment angle according to the pointer 6601 corresponding to the scale 6602 on the first fixing plate 661.

[0048] Specifically, rotating the second handle 6611 drives the rotation of the upper cylinder of the sliding column 668. The middle parts of the upper and lower cylinders of the sliding column 668 are connected by a screw thread. The upper cylinder is connected to the second handle 6611. Rotating the second handle 6611 drives the rotation of the upper cylinder, so that the middle screw is loosened or tightened. After loosening, it can slide in the second chute 6610 of the connecting plate 669. After tightening, the connecting plate 669 is clamped by the upper and lower cylinders. After loosening the upper and lower cylinders of the sliding column 668, the sliding column 668 slides in the second chute 6610 of the connecting plate 66. One end of the adjusting plate 663 is rotatably connected to the second fixing plate 666 through a rotating rod 665. After the sliding column 668 slides, the adjusting plate 663 adjusts the angle. The sliding rod 664 of the adjusting plate 663 slides in the arc-shaped first chute 662 on the first fixing plate 661, so as to adjust the angle of the adjusting plate 663. After adjusting the angle, rotate the second handle 6611 to lock the upper and lower cylinders of the sliding column 668. When the moving seat 61 and the grinding table 65 move, the grinding table 65 is connected through the connecting plate 669, so that the connecting plate 669 drives the sliding column 668, and then the sliding frame 667 at the bottom of the sliding column 668 slides on the adjusting plate 663. After the adjusting plate 663 adjusts the angle, the sliding frame 66 moves according to the angle, and the grinding table 65 simultaneously moves horizontally on the moving seat 61.

[0049] The present invention provides a surface treatment device for valve castings. By adopting processes such as pickling, grinding, phosphating, and primer coating, it can ensure that the surface of the valve casting is smoother, and improve the adhesion and corrosion resistance of the metal surface, providing a better foundation for the subsequent coating, so as to realize more efficient treatment of the surface of the valve casting.

[0050] The grinding device of the present invention is provided with a transmission and position adjustment mechanism 4. The transmission and position adjustment mechanism 4 includes a position adjustment component 41 and a synchronous transmission component 42. The position adjustment component 4 includes two groups of swing arms that are rotatably connected to each other, which can flexibly adjust the grinding angle position of the grinding head 5. Its adjustment position can be manually adjusted to ensure that the grinding position better adapts to the size of the valve casting and improve the grinding efficiency. At the same time, the synchronous transmission component 42 is cooperatively driven by two groups of pulley sets, so that when the position adjustment component 41 adjusts the position, the transmission of the grinding head 5 is not affected, enabling the position adjustment component 41 to be better adjusted.

[0051] The grinding device of the present invention is also provided with a positioning and adjusting mechanism 6. Driven by the second motor 64, the threaded rod 63 rotates to drive the moving seat 61 to move. The side adjusting assembly 66 provided on one side of the base 1 can make the grinding table 65 move horizontally on the moving seat 61 according to the set angle, that is, while the moving seat 61 moves back and forth, the grinding table 65 can synchronously move horizontally according to the set angle, so as to better adjust the position of the valve casting on the grinding table 65 to improve the grinding efficiency. The foregoing is only a preferred example of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A surface treatment device for valve castings, characterized in that: The treatment process includes the following steps: S1 Surface cleaning: First, use alkaline cleaner to clean the surface of the valve casting to remove oil and dust on the surface; S2 Pickling and rust removal: For rusty castings, use an acid solution to pickle the casting surface to remove oxide scale and other impurities; S3 surface roughness treatment: grinding and processing by grinding device to adjust the surface roughness; S4 Phosphate treatment: After the polished casting is phosphated, a phosphate film is formed on the surface of the casting; S5 Primer Painting: Finally, before spraying, apply a layer of polyurethane primer to complete the surface treatment; The grinding device in step S3 includes a base, a stand, a first motor, a transmission adjustment mechanism, a grinding head, a positioning adjustment mechanism and a positioning piece, wherein the stand is installed at the rear of the base, the first motor is installed on the stand, the transmission adjustment mechanism is installed at the front end of the stand, the grinding head is installed at the front bottom of the transmission adjustment mechanism, the positioning adjustment mechanism is installed at the front of the base, and the positioning adjustment mechanism is installed on the positioning piece for fixing the valve casting; The transmission and positioning mechanism comprises a positioning assembly and a synchronous transmission assembly. One end of the positioning assembly is connected to the stand, and a grinding head is installed at the bottom of the other end. The synchronous transmission assembly is installed on the positioning assembly. The first motor is transmitted to the grinding head through the synchronous transmission assembly. The adjustment assembly includes a first swing arm, a first joint, a second joint, the second swing arm, a third joint, a mounting seat and a first handle, wherein one end of the first swing arm is provided with a first joint and is rotatably connected to the front end of the stand through the first joint, the other end of the first swing arm is provided with a second joint and is rotatably connected to the third joint provided at one end of the second swing arm through the second joint, the other end of the second swing arm is provided with a mounting seat, and one side of the mounting seat is provided with a first handle; The synchronous transmission assembly includes a first transmission shaft, a first pulley, a first belt, a second pulley, a second transmission shaft, a third pulley, a second belt, a fourth pulley and a third transmission shaft. The first transmission shaft passes through the stand and the first joint and is connected to the output end of the first motor at one end, and is connected to the middle of the first pulley at the other end. The outer side of the first pulley is connected to the second pulley through the first belt, the middle part of the second pulley is connected to the second transmission shaft, the second transmission shaft passes through the second joint and the third joint and is connected to the middle part of the third pulley, the outer side of the third pulley is connected to the fourth pulley through the second belt, the middle part of the fourth pulley is connected to the third transmission shaft, and the third transmission shaft passes through the mounting seat and is connected to the grinding head.

2. The surface treatment device for valve casting according to claim 1, characterized in that: In the step S1, the alkaline cleaning agent is one of trisodium phosphate, sodium hydroxide, potassium dihydrogen phosphate, and disodium hydrogen phosphate.

3. The surface treatment device for valve casting according to claim 1, characterized in that: In step S2, the acidic solution is one of hydrochloric acid, nitric acid or phosphoric acid for pickling and rust removal, the pickling time is 15-35 minutes, and the concentration of the acidic solution is 5%-20%.

4. The surface treatment device for valve casting according to claim 1, characterized in that: The phosphating treatment in step S4 is performed by using one of phosphate phosphating and zinc phosphating.

5. The surface treatment device for valve casting according to claim 1, characterized in that: The positioning and adjustment mechanism includes a moving seat, a slide rail, a threaded rod, a second motor, a grinding table and a side adjustment component. The slide rail arranged on one side of the moving seat is slidably connected to the slide rail installed on the base, and the slider arranged on the other side of the moving seat is threadedly matched with the threaded rod. Both ends of the threaded rod are installed on the base through supports, and the second motor is installed on the support at the rear of the threaded rod, and the output end of the second motor is connected to one end of the threaded rod through a coupling. A grinding table is provided at the upper end of the moving seat for horizontal sliding, and a positioning piece is installed at the upper end of the grinding table. A side adjustment component is provided on one side of the moving seat, and the side adjustment component is installed on the base and connected to one side of the grinding table.

6. The surface treatment device for valve casting according to claim 5, characterized in that: The side adjustment assembly includes a first fixed plate, a first slide groove, an adjustment plate, a sliding rod, a rotating rod, a second fixed plate, a sliding frame, a sliding column, a connecting plate, a second slide groove and a second handle. The first fixed plate and the second fixed plate are symmetrically installed on the base. The first fixed plate is provided with an arc-shaped first slide groove, and the first slide groove is slidably matched with the sliding rod arranged at one end of the adjustment plate. The other end of the adjustment plate is rotatably connected to the second fixed plate through the rotating rod. The adjustment plate is slidably connected with the sliding frame, and the sliding frame is equipped with a sliding column with a second handle. The sliding column is slidably connected to the second slide groove arranged on the connecting plate, and the connecting plate is connected to one side of the grinding table.

7. The surface treatment device for valve casting according to claim 6, characterized in that: A pointer is arranged on one end of the adjustment plate facing the first fixing plate, and corresponds to the scale arranged on the first fixing plate.

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