Surface treatment system before steel wire coating or plating process

Abstract

The invention discloses a surface treatment system before a steel wire coating or plating process, which comprises a steel wire surface consistency surface abrasive paper polishing system, and the steel wire surface consistency surface abrasive paper polishing system comprises a first polishing unit, a second polishing unit, a third polishing unit and a fourth polishing unit which are equidistantly distributed along the extension direction of a steel wire; when the first grinding unit, the second grinding unit, the third grinding unit and the fourth grinding unit which are of the same structure are in the view angle of the axis of the steel wire, the second grinding unit, the third grinding unit and the fourth grinding unit deflect by 90 degrees, 180 degrees and 270 degrees in the anticlockwise direction relative to the first grinding unit correspondingly; and the high-consistency grinding continuity of the abrasive paper can be improved.

Description

Technical Field

[0001] The invention belongs to the field of steel wire surface treatment. Background Art

[0002] During the production, storage or transportation of bare steel wire before electroplating or coating, rust or oxide will form on its surface. If electroplating or coating is directly applied to the bare steel wire, these surface contaminants will hinder the direct contact between the coating and the substrate, resulting in decreased bonding strength and even peeling of the coating.

[0003] Grinding can remove these impurities, providing a clean active surface. Grinding also creates a uniform micro-rough surface, significantly increasing the contact area between the coating and the substrate (e.g., through mechanical bite). When the surface roughness Ra value is within the range of 0.8-3.2μm, the coating bonding strength can be increased by 30%-50%. High-precision steel wire has stringent requirements for surface integrity. Grinding can remove stress concentration sources such as burrs and microcracks, preventing the propagation of defects during subsequent processing.

[0004] For example, in cold-drawn steel wire, eliminating surface defects can increase fatigue life by 2-3 times; at the same time, the newly polished metal surface has higher reactivity, which can ensure uniform deposition of metal ions during electroplating. The thickness deviation of the electroplated layer of the polished steel wire can be controlled within ±1μm, while the deviation of the untreated surface can reach ±5μm; the flat surface can avoid local accumulation or poor plating of the electroplating solution; the salt spray test time of the polished steel wire can reach more than 3 times that of the untreated one.

[0005] The core advantage of using high-consistency sandpaper to polish steel wire surfaces lies in the ability to achieve highly consistent surface roughness (typically, the Ra value fluctuation range can be controlled within ±0.2μm) through precisely controlled abrasive distribution and uniform cutting force. This process is particularly suitable for fields with stringent surface quality requirements, such as medical devices and precision springs, ensuring that each batch of products has a completely consistent friction coefficient and coating adhesion. The abrasive grains of standardized sandpaper are made of cubic boron nitride (CBN) or diamond coating technology, and the particle size deviation is strictly controlled within 5%. Combined with a constant pressure polishing device, it can eliminate the random scratches caused by traditional manual polishing.

[0006] However, as the grinding process progresses, the abrasive grains on the sandpaper surface will experience three stages of loss: passivation, breakage, and shedding. The effective abrasive density will decrease from the initial 1200 grains / cm 2 Reduced to 800 particles / cm 2 More importantly, the random shedding of abrasive particles destroys the homogenized structure of the sandpaper surface, causing "grinding force black holes" in local areas. This attenuation characteristic shortens the duration of the high consistency of the sandpaper grinding process, thus affecting the overall grinding consistency. Summary of the Invention

[0007] Object of the Invention: In order to overcome the deficiencies existing in the prior art, the present invention provides a surface treatment system before a steel wire coating or plating process, which can improve the persistence of high-consistency grinding of sandpaper.

[0008] Technical Solution: To achieve the above object, a surface treatment system before a steel wire coating or plating process of the present invention includes a surface sandpaper grinding system for the consistency of the steel wire surface. The surface sandpaper grinding system for the consistency of the steel wire surface includes a first grinding unit, a second grinding unit, a third grinding unit, and a fourth grinding unit that are equidistantly distributed along the extending direction of the steel wire.

[0009] For the first grinding unit, the second grinding unit, the third grinding unit, and the fourth grinding unit with the same structure, from the perspective of the axis of the steel wire, the second grinding unit, the third grinding unit, and the fourth grinding unit are respectively deflected 90°, 180°, and 270° counterclockwise relative to the first grinding unit;

[0010] The outer peripheral surface of the steel wire is equally divided into an A arc surface, a B arc surface, a C arc surface, and a D arc surface in the clockwise direction; the first grinding unit, the second grinding unit, the third grinding unit, and the fourth grinding unit respectively correspond to the A arc surface, the B arc surface, the C arc surface, and the D arc surface.

[0011] Furthermore, the first grinding unit includes an annular runner coaxial with the steel wire, a new sandpaper belt reel, and a sandpaper belt recovery reel;

[0012] In the initial state structure:

[0013] First roller mounting grooves and second roller mounting grooves are symmetrically formed on both sides of the annular runner; two first rollers are rotatably mounted up and down in the first roller mounting groove, and two second rollers are rotatably mounted up and down in the second roller mounting groove;

[0014] The new sandpaper belt reel and the sandpaper belt recovery reel are respectively on both sides of the annular runner;

[0015] In the initial state, the sandpaper belt led out by the new sandpaper belt reel sequentially includes a sandpaper belt straight lead-out section, a sandpaper belt first arc section, a sandpaper belt working section, a sandpaper belt second arc section, and a sandpaper belt straight recovery section along the length direction;

[0016] The connection part between the sandpaper belt working section and the sandpaper belt second arc section passes between the two first rollers;

[0017] The connection part between the sandpaper belt working section and the sandpaper belt first arc section passes between the two second rollers.

[0018] Furthermore, the new sandpaper belt reel and the sandpaper belt recovery reel are driven by their respective driving devices to actively rotate around their respective axes.

[0019] Further, at the ends where the two first roller wheels and the two second roller wheels are away from each other, they both protrude from the cylindrical surface where the outer peripheral surface of the annular runner is located.

[0020] Further, in the initial state, the left end of the straight lead-out section of the sandpaper belt is connected to the lead-out end of the new sandpaper belt reel, and the straight lead-out section of the sandpaper belt extends horizontally along the tangent direction of the upper end of the annular runner; the circular angle of the first arc section of the sandpaper belt is °, and the first arc section of the sandpaper belt adheres to the outer arc surface on the upper right side of the annular runner; the middle part of the working section of the sandpaper belt crosses over the upper part of the steel wire, and the steel wire exerts an upward pushing force on the middle part of the working section of the sandpaper belt, making the working section of the sandpaper belt in a curved shape with the middle part convex upward, and the side with frosting of the working section of the sandpaper belt faces downward. The part where the working section of the sandpaper belt contacts the steel wire is denoted as the frosting contact part; the circular angle of the second arc section of the sandpaper belt is °, and the second arc section of the sandpaper belt adheres to the outer arc surface on the lower left side of the annular runner; the straight recovery section of the sandpaper belt extends horizontally along the tangent direction of the lower end of the annular runner, and the right end of the straight recovery section of the sandpaper belt is connected to the winding end of the sandpaper belt recovery reel.

[0021] Further, it also includes an annular turntable coaxial with the annular runner. The annular runner is coaxially and fixedly connected to the annular runner through several connecting arms; one end of the annular turntable is coaxially and fixedly connected with a steel wire through cylinder; the steel wire coaxially passes through the steel wire through channel inside the steel wire through cylinder; the outer wall of the end of the steel wire through cylinder away from the annular turntable is rotatably installed on the bearing seat through a bearing; a torsion spring is sleeved outside the steel wire through cylinder, and the two ends of the torsion spring are respectively fixedly connected to the bearing seat and the annular turntable. The torsion spring applies a clockwise torque to the annular turntable, so that the annular runner has a tendency to rotate clockwise under the action of the torsion spring.

[0022] Further, the working method of the first grinding unit:

[0023] Step 1, in the initial state, both the new sandpaper belt reel and the sandpaper belt recovery reel are stationary, and this is denoted as state a;

[0024] Step 2, control the new sandpaper belt reel and the sandpaper belt recovery reel to perform winding actions simultaneously until the lengths of the first arc section and the second arc section of the sandpaper belt become zero, and this is denoted as state b;

[0025] Step 3, control the new sandpaper belt reel and the sandpaper belt recovery reel to perform unwinding actions simultaneously until the annular runner returns to the initial position;

[0026] Step 4, repeat the cycle of "Step 2" to "Step 3" for N times;

[0027] Step 5: Run "Step 2" once to restore the annular runner to state b. Then, while the sandpaper belt recovery reel slowly winds up, the new sandpaper belt reel slowly unwinds, so that the sandpaper belt as a whole smoothly feeds a certain distance along its own length direction. Finally, run "Step 3" once to return to state a;

[0028] Step 6: Control the wire to feed a distance equal to the width of a working section of the sandpaper belt along its own extension direction;

[0029] Continuously cycle through "Step 1" to "Step 6".

[0030] Beneficial effects: Continuously cycling through "Step 1" to "Step 6" of the present invention can achieve continuous fine grinding of the outer peripheral surface along the length direction of the wire, and each cycle updates the abrasive contact part once, avoiding the problem of poor consistency in grinding caused by the wear of the abrasive surface of the abrasive contact part. Description of the Drawings

[0031] Figure 1 It is a schematic diagram of the overall solution;

[0032] Figure 2 It is a schematic diagram of the cross-section of the wire;

[0033] Figure 3 It is a schematic diagram of two perspectives of the first grinding unit;

[0034] Figure 4 It is a schematic diagram of the switching between state a and state b of the first grinding unit;

[0035] Figure 5 For Figure 4 It is a schematic diagram with the annular runner hidden. Detailed Embodiment

[0036] The present invention will be further described in conjunction with the accompanying drawings.

[0037] As shown in the attached Figures 1 to 5 A surface treatment system before a wire coating or plating process. The wire 2 in this solution is a special mechanical wire with an outer diameter of about 5 mm. The equipment in this solution includes a wire conveying device that can linearly convey the wire 2 along its own length direction and a wire surface consistency surface sandpaper grinding system 1. Among them, the wire conveying device is a conventional structure, and its function is to convey the wire along the length direction.

[0038] The core content of this solution is as Figure 1As shown in the figure, the wire surface consistency surface sanding system 1 includes a first sanding unit 1a, a second sanding unit 1b, a third sanding unit 1c, and a fourth sanding unit 1d that are equally spaced along the extension direction of the wire 2; the first sanding unit 1a, the second sanding unit 1b, the third sanding unit 1c, and the fourth sanding unit 1d with the same structure are deflected 90°, 180°, and 270° counterclockwise relative to the first sanding unit 1a from the perspective of the axis of the wire 2; as Figure 2 shown, the outer peripheral surface of the wire 2 is equally divided into an A arc surface, a B arc surface, a C arc surface, and a D arc surface in the clockwise direction; the first sanding unit 1a, the second sanding unit 1b, the third sanding unit 1c, and the fourth sanding unit 1d respectively correspond to the A arc surface, the B arc surface, the C arc surface, and the D arc surface. In general, this case realizes the consistent sanding of the complete circumferential surface of the wire 2 through the cooperation of the first sanding unit 1a, the second sanding unit 1b, the third sanding unit 1c, and the fourth sanding unit 1d; since the structures and working principles of the first sanding unit 1a, the second sanding unit 1b, the third sanding unit 1c, and the fourth sanding unit 1d are the same; only the sanding directions of the first sanding unit 1a, the second sanding unit 1b, the third sanding unit 1c, and the fourth sanding unit 1d are the A arc surface, the B arc surface, the C arc surface, and the D arc surface of the wire 2 respectively; therefore, this solution focuses on introducing the detailed structural features and working methods of the first sanding unit 1a: the structures and working principles of the second sanding unit 1b, the third sanding unit 1c, and the fourth sanding unit 1d can be analogized accordingly.

[0039] The following is the detailed solution and process of the first sanding unit 1a:

[0040] As Figure 3 、 4 shown in FIGS. 5, the first sanding unit 1a includes an annular runner 8 coaxial with the wire 2, a new sandpaper belt reel 4, and a sandpaper belt recovery reel 5; the new sandpaper belt reel 4 and the sandpaper belt recovery reel 5 are driven by their respective driving devices, and in this solution, a servo motor is used for driving, so as to actively rotate around their respective axes.

[0041] In the initial state structure of this solution (the initial state is denoted as the a state):

[0042] On both sides of the annular runner 8, a first roller mounting groove 15 and a second roller mounting groove 16 are symmetrically provided; two first rollers 16 are rotatably mounted up and down in the first roller mounting groove 15, and two second rollers 7 are rotatably mounted up and down in the second roller mounting groove 16; the axes of the first rollers 16 and the second rollers 7 are both parallel to the axis of the annular runner 8; the ends of the two first rollers 16 and the two second rollers 7 away from each other all protrude from the virtual cylindrical surface where the outer peripheral surface of the annular runner 8 is located, so as to avoid excessive sliding friction during the process of "Step Five"; the new sandpaper belt reel 4 and the sandpaper belt recovery reel 5 are respectively on both sides of the annular runner 8; a new sandpaper belt roll and a failed sandpaper belt roll are respectively wound on the new sandpaper belt reel 4 and the sandpaper belt recovery reel 5. In the initial state, the sandpaper belt 1 led out from the new sandpaper belt reel 4 sequentially includes a sandpaper belt straight lead-out section 3a, a sandpaper belt first arc section 3b, a sandpaper belt working section 3c, a sandpaper belt second arc section 3d, and a sandpaper belt straight recovery section 3e along the length direction; the connection part between the sandpaper belt working section 3c and the sandpaper belt second arc section 3d passes between the two first rollers 16; the connection part between the sandpaper belt working section 3c and the sandpaper belt first arc section 3b passes between the two second rollers 7; the belt part of the sandpaper belt 1 of this solution is more flexible than the paper part of the traditional sandpaper, and has a higher tensile strength; the belt part of the sandpaper belt 1 of this solution is made of non-woven nylon fiber, polyester or cloth-based material.

[0043] As Figure 4 , in the initial state, the left end of the sandpaper belt straight lead-out section 3a is connected to the lead-out end of the new sandpaper belt reel 4, and the sandpaper belt straight lead-out section 3a extends horizontally along the upper tangent direction of the annular runner 8; the circular angle of the sandpaper belt first arc section 3b is 90°, and the sandpaper belt first arc section 3b is attached to the outer arc surface on the upper right side of the annular runner 8; the middle part of the sandpaper belt working section 3c straddles the upper part of the steel wire 2, and the steel wire 2 forms an upward pushing force on the middle part of the sandpaper belt working section 3c, so that the sandpaper belt working section 3c is in a curved shape with the middle part convex upward, and the sanded side of the sandpaper belt working section 3c faces downward; the circular angle of the sandpaper belt second arc section 3d is 90°, and the sandpaper belt second arc section 3d is attached to the outer arc surface on the lower left side of the annular runner 8; the sandpaper belt straight recovery section 3e extends horizontally along the lower tangent direction of the annular runner 8, and the right end of the sandpaper belt straight recovery section 3e is connected to the winding end of the sandpaper belt recovery reel 5; it further includes an annular turntable 10 coaxial with the annular runner 8, and the annular runner 8 is coaxially and fixedly connected to the annular runner 8 through a plurality of connecting arms 14; one end of the annular turntable 10 is coaxially and fixedly connected with a steel wire passing cylinder 12; the steel wire 2 coaxially passes through the steel wire passing channel 9 in the steel wire passing cylinder 12.

[0044] The wire passes through the outer wall of one end of the cylinder 12 far away from the annular turntable 10 and is rotatably installed on the bearing seat 11 through a bearing; the bearing seat 11 is fixedly arranged; a torsion spring 13 is sleeved outside the wire passing through the cylinder 12, and both ends of the torsion spring 13 are fixedly connected to the bearing seat 11 and the annular turntable 10 respectively. The torsion spring 13 applies a clockwise torque to the annular turntable 10, so that the annular runner 8 has a tendency to rotate clockwise under the action of the torsion spring 13.

[0045] The part where the working section 3c of the sandpaper belt contacts the wire 2 is denoted as the grinding contact part 4.

[0046] Working method of the first grinding unit 1a:

[0047] Step 1, in the initial state, both the new sandpaper belt reel 4 and the sandpaper belt recycling reel 5 are stationary, and the taut wire 2 is also stationary. The annular runner 8 maintains static balance under the combined action of the tangential tension of the straight leading section 3a of the sandpaper belt, the tangential tension of the straight recycling section 3e of the sandpaper belt, and the clockwise torque of the torsion spring 13. The torsion spring 13 makes the entire sandpaper belt 1 led out by the new sandpaper belt reel 4 taut, and further forms a contact force between the grinding contact part 4 of the working section 3c of the sandpaper belt and the surface of the wire 2. At this time, the grinding contact part 4 where the working section 3c of the sandpaper belt contacts the wire 2 is just at the upper end position of the wire 2, and this is denoted as state a at this time.

[0048] Step 2, on the basis of state a, control the new sandpaper belt reel 4 and the sandpaper belt recycling reel 5 to perform winding actions simultaneously, so that the annular runner 8 rotates counterclockwise against the torsion spring 13 under the combined action of the tangential tension of the straight leading section 3a of the sandpaper belt and the tangential tension of the straight recycling section 3e of the sandpaper belt. The lengths of the first arc section 3b and the second arc section 3d of the sandpaper belt gradually become shorter until the annular runner 8 rotates counterclockwise by exactly 90° relative to the initial state, and at this time the lengths of the first arc section 3b and the second arc section 3d of the sandpaper belt become zero, and this is denoted as state b at this time. In this step, during the process of changing from state a to state b, the grinding contact part 4 of the working section 3c of the sandpaper belt completely slides across a partial section A arc surface of the wire 2 in the counterclockwise direction on the basis of having a contact force.

[0049] Step 3, then on the basis of state b, control the new sandpaper belt reel 4 and the sandpaper belt recycling reel 5 to perform unwinding actions simultaneously, so that the annular runner 8 rotates clockwise along the axis under the drive of the clockwise torque of the torsion spring 13. The lengths of the first arc section 3b and the second arc section 3d of the sandpaper belt gradually become longer from zero until the annular runner 8 returns to the initial position and then returns to state a. In this step, during the process of changing from state b to state a, the grinding contact part 4 of the working section 3c of the sandpaper belt completely slides across a partial section A arc surface of the wire 2 in the clockwise direction on the basis of having a contact force.

[0050] Step Four: Repeat the loop of "Step Two" to "Step Three" for N times, so that the abrasive contact part 4 of the working section 3c of the sandpaper belt performs 2N times of grinding on the A arc surface of a partial section of the steel wire 2, thereby removing burrs, rust shells, and rust spots on the A arc surface of this partial section of the steel wire 2, and thus completing the fine sandpaper grinding process of the A arc surface of this partial section of the steel wire 2. At the same time, after the abrasive contact part 4 of the working section 3c of the sandpaper belt performs 2N times of grinding on the A arc surface, the abrasives on the abrasive surface of the abrasive contact part 4 are consumed. If it continues to be used, the grinding performance will become lower, resulting in a worse consistency effect in the subsequent grinding process.

[0051] Step Five: Run "Step Two" once to restore the ring-shaped runner 8 to state b, as shown in the bottommost figure of Figure 4 In this state b, the lengths of the first arc section 3b and the second arc section 3d of the sandpaper belt become zero, making the static friction between the first arc section 3b and the second arc section 3d of the sandpaper belt and the outer peripheral surface of the ring-shaped runner 8 become zero, providing a basis for the linear movement of the sandpaper belt 1 in this step. Then, while the sandpaper belt recovery reel 5 slowly winds up, the new sandpaper belt reel 4 slowly unwinds, so that the entire sandpaper belt 1 feeds smoothly along its own length direction for a certain distance at this time. The original abrasive contact part 4 of the working section 3c of the sandpaper belt undergoes a certain offset along the length direction of the working section 3c of the sandpaper belt, replacing the abrasive surface of the abrasive contact part 4 with a new abrasive surface, thereby smoothly updating the abrasive contact part 4 of the working section 3c of the sandpaper belt. Finally, run "Step Three" once, and the ring-shaped runner 8 returns to its initial position and then returns to state a. At this time, the abrasive surface of the abrasive contact part 4 is a new abrasive surface.

[0052] Step Six: Control the steel wire 2 to feed a distance equal to the width of the working section 3c of the sandpaper belt along its own extension direction, so that the steel wire 2 slips relative to the abrasive contact part 4, making the A arc surface of another waiting-to-be-ground partial section on the steel wire 2 correspond to the new abrasive contact part 4 of the working section 3c of the sandpaper belt for grinding. Thus, a complete working cycle of the first grinding unit 1a ends.

[0053] Continuously cycling "Step One" to "Step Six" can achieve continuous fine grinding of the A arc surface along the length direction of the steel wire 2, and the abrasive contact part 4 is updated once in each cycle, avoiding the problem of poor grinding consistency caused by the wear of the abrasive surface of the abrasive contact part 4.

[0054] During the process of the first grinding unit 1a continuously cycling "Step One" to "Step Six", the second grinding unit 1b, the third grinding unit 1c, and the fourth grinding unit 1d also cycle the process of "Step One" to "Step Six" with the same working principle and working rhythm. Furthermore, the steel wire surface consistency surface sandpaper grinding system 1 as a whole realizes a highly consistent continuous fine grinding process of the entire circumferential surface of the steel wire 2 along the length direction of the steel wire 2.

[0055] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A surface treatment system before a steel wire coating or plating process, characterized in that: It includes a surface sanding system (1) for the surface consistency of the steel wire. The surface sanding system (1) for the surface consistency of the steel wire includes a first sanding unit (1a), a second sanding unit (1b), a third sanding unit (1c), and a fourth sanding unit (1d) that are equidistantly distributed along the extending direction of the steel wire (2). For the first sanding unit (1a), the second sanding unit (1b), the third sanding unit (1c), and the fourth sanding unit (1d) with the same structure, from the perspective of the axis of the steel wire (2), the second sanding unit (1b), the third sanding unit (1c), and the fourth sanding unit (1d) are respectively deflected 90°, 180°, and 270° counterclockwise relative to the first sanding unit (1a). The outer peripheral surface of the steel wire (2) is equally divided into an A arc surface, a B arc surface, a C arc surface, and a D arc surface in the clockwise direction; the first sanding unit (1a), the second sanding unit (1b), the third sanding unit (1c), and the fourth sanding unit (1d) respectively correspond to the A arc surface, the B arc surface, the C arc surface, and the D arc surface.

2. The surface treatment system before a steel wire coating or plating process according to claim 1, wherein: The first sanding unit (1a) includes an annular runner (8) coaxial with the steel wire (2), a new sandpaper belt reel (4), and a sandpaper belt recycling reel (5). In the structure of the initial state: On both sides of the annular runner (8), a first roller mounting groove (15) and a second roller mounting groove (16) are symmetrically provided; in the first roller mounting groove (15), two first rollers (16) are rotatably mounted up and down, and in the second roller mounting groove (16), two second rollers (7) are rotatably mounted up and down. The new sandpaper belt reel (4) and the sandpaper belt recycling reel (5) are respectively on both sides of the annular runner (8). In the initial state, the sandpaper belt (1) led out from the new sandpaper belt reel (4) sequentially includes a sandpaper belt straight leading-out section (3a), a sandpaper belt first arc section (3b), a sandpaper belt working section (3c), a sandpaper belt second arc section (3d), and a sandpaper belt straight recycling section (3e) along the length direction. The connection between the sandpaper belt working section (3c) and the sandpaper belt second arc section (3d) passes between the two first rollers (16). The connection between the sandpaper belt working section (3c) and the sandpaper belt first arc section (3b) passes between the two second rollers (7).

3. The surface treatment system before a steel wire coating or plating process according to claim 2, wherein: The new sandpaper belt reel (4) and the sandpaper belt recycling reel (5) are driven by their respective driving devices to actively rotate around their respective axes.

4. A surface treatment system before a steel wire coating or plating process according to claim 3, characterized in that: One ends of the two first rollers (16) and the two second rollers (7) that are away from each other both protrude from the cylindrical surface where the outer peripheral surface of the annular runner (8) is located.

5. The surface treatment system before a steel wire coating or plating process according to claim 4, characterized in that: In the initial state, the left end of the straight lead-out section (3a) of the sandpaper belt is connected to the lead-out end of the new sandpaper belt reel (4), and the straight lead-out section (3a) of the sandpaper belt extends horizontally along the upper tangent direction of the annular runner (8); the circular angle of the first arc section (3b) of the sandpaper belt is 90°, and the first arc section (3b) of the sandpaper belt adheres to the outer arc surface on the upper right side of the annular runner (8); the middle of the working section (3c) of the sandpaper belt straddles the upper part of the steel wire (2), and the steel wire (2) exerts an upward pushing force on the middle of the working section (3c) of the sandpaper belt, making the middle of the working section (3c) of the sandpaper belt in a convex bending shape, and the side with sanding of the working section (3c) of the sandpaper belt faces downward. The part where the working section (3c) of the sandpaper belt contacts the steel wire (2) is denoted as the sanding contact part (4); the circular angle of the second arc section (3d) of the sandpaper belt is 90°, and the second arc section (3d) of the sandpaper belt adheres to the outer arc surface on the lower left side of the annular runner (8); the straight recovery section (3e) of the sandpaper belt extends horizontally along the lower tangent direction of the annular runner (8), and the right end of the straight recovery section (3e) of the sandpaper belt is connected to the winding end of the sandpaper belt recovery reel (5).

6. The surface treatment system before a steel wire coating or plating process according to claim 5, characterized in that: It further includes an annular turntable (10) coaxial with the annular runner (8), and the annular runner (8) is coaxially and fixedly connected to the annular runner (8) through a plurality of connecting arms (14); one end of the annular turntable (10) is coaxially and fixedly connected with a steel wire passing cylinder (12); the steel wire (2) coaxially passes through the steel wire passing channel (9) in the steel wire passing cylinder (12); the outer wall of the end of the steel wire passing cylinder (12) far from the annular turntable (10) is rotatably installed on the bearing seat (11) through a bearing; a torsion spring (13) is sleeved outside the steel wire passing cylinder (x), and the two ends of the torsion spring (13) are respectively fixedly connected to the bearing seat (11) and the annular turntable (10). The torsion spring (13) exerts a clockwise torque on the annular turntable (10), so that the annular runner (8) has a tendency to rotate clockwise under the action of the torsion spring (13).

7. The surface treatment system before a steel wire coating or plating process according to claim 6, characterized in that: The working method of the first grinding unit (1a): Step 1, in the initial state, both the new sandpaper belt reel (4) and the sandpaper belt recovery reel (5) are stationary, and this is denoted as state a at this time; Step 2, control the new sandpaper belt reel (4) and the sandpaper belt recovery reel (5) to perform winding actions simultaneously until the lengths of the first arc section (3b) and the second arc section (3d) of the sandpaper belt become zero, and this is denoted as state b at this time; Step 3, control the new sandpaper belt reel (4) and the sandpaper belt recovery reel (5) to perform unwinding actions simultaneously until the annular runner (8) returns to the initial position; Step 4, repeat the cycle of "Step 2" to "Step 3" for N times; Step 5, run "Step 2" once to make the annular runner (8) return to state b. Then, while the sandpaper belt recovery reel (5) slowly winds, the new sandpaper belt reel (4) slowly unwinds, so that the entire sandpaper belt (1) smoothly advances a certain distance along its own length direction at this time. Finally, run "Step 3" once to return to state a; Step 6, control the wire (2) to feed a distance equal to the width of a working section (3c) of the abrasive belt along its own extension direction; Continuously loop through "Step 1" to "Step 6".

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