CN117644320A - Powder control device and flux-cored wire powder winding machine - Google Patents

Abstract

The invention discloses a powder control device and a flux-cored wire powder winding machine, which comprise a powder control seat, wherein a powder control ratchet wheel for trowelling and compacting brazing flux powder contained in a U-shaped welding belt is arranged on the powder control seat; the powder control ratchet comprises a ratchet body and pawls uniformly distributed on the outer side of the ratchet body in the circumferential direction, each pawl comprises a plane and a cambered surface, and the edges of the two sides of the cambered surface are provided with chamfers; the height of the powder control ratchet wheel is adjustable and can rotate around the axis of the powder control ratchet wheel; when the powder control ratchet rotates, the rotation direction of the lowest point of the powder control ratchet is opposite to the advancing direction of the U-shaped welding strip, and the plane of the pawl at the lowest position of the powder control ratchet faces the conveyed U-shaped welding strip and the brazing flux powder contained in the U-shaped welding strip and can prevent the excessive brazing flux powder from being discharged. The flux-cored wire powder winding machine comprises a belt unwinding mechanism, a U-shaped roller seat, a powder hopper, a powder control device, a wire winding forming die holder and a winding mechanism which are sequentially arranged.

Description

Powder control device and flux-cored wire powder winding machine

Technical Field

The invention relates to the technical field of flux-cored wire forming, in particular to a powder control device and a flux-cored wire powder winding machine comprising the same.

Background

There are many manufacturing processes for flux-cored wires. In the 21 st century, commercial high-end flux-cored wires were manufactured by developed countries in japan and europe. There are few specialized equipment for manufacturing flux-cored wires at home.

The flux powder content in the flux core is most difficult to control in the manufacturing process of the flux-cored wire, and the flux powder is low in density, loose in accumulation and easy to bridge to generate pores in the flux-cored wire, so that the quality of the flux-cored wire is poor, and a device capable of stably controlling the flux powder content and compacting the flux powder in the flux core is needed to solve the problem.

Patent specification with publication number of CN201645063U discloses a manufacturing device for a flux-cored wire with small diameter, which solves the problem of accurately and quantitatively adding powder. The manufacturing equipment consists of a roller device, a set of powder adding mechanism, a joint roller device, a wire drawing winding drum device and a PLC programmable controller, wherein the powder adding mechanism comprises a powder storage barrel, a powder adding hopper is arranged below the powder storage barrel, and a quantitative sheet jelly conveying belt is arranged below the powder adding hopper; the quantitative sheet jelly feeding belt is driven by a motor, and the PLC precisely controls the rotating speed of the motor through a frequency converter. By adopting the structure, the PLC precisely controls the rotating speed of the motor through the frequency converter, so that the rotating speed of the powder feeding belt is precisely controlled, the powder adding amount is further controlled, and the powder adding rate of the flux-cored wire is ensured to be stable and accurate. The manufacturing equipment of the flux-cored wire with the small diameter in the patent technology can not compact and level flux powder, and is easy to cause gaps in the flux-cored wire, so that the quality of the flux-cored wire is reduced.

The patent specification with publication number of CN101837527A discloses a flux-cored wire automatic control powder adding device and an automatic control method, wherein the method comprises the steps of primary powder adding, secondary powder adding, powder feeding belt center distance adjustment, automatic compensation tensioning and dust removal; the automatic control powder adding device changes the powder adding part from a primary uncontrollable powder adding mechanism to a secondary automatic control powder adding mechanism. The powder feeding is a belt conveying mechanism with adjustable center distance and self-compensating tensioning of the belt, and the powder adding device is an integral totally-enclosed dust removing and collecting structure. The powder adding mechanism in the flux-cored wire automatic control powder adding device in the patent technology is complex, and the flux powder cannot be compacted and smoothed as well.

Disclosure of Invention

The invention provides a powder control device and a flux-cored wire powder winding machine comprising the same. The invention has compact structure, small and exquisite structure, simplicity, practicability, flexible and convenient operation and can ensure the quality of products. The wire coiling process related by the invention is that a welding strip machine is rolled into a U-shaped shape, brazing flux powder is added, the brazing flux powder is smoothed and compacted, the superfluous brazing flux powder is discharged (the superfluous brazing flux powder can be recycled), and then the welding strip machine is molded and closed into an O-shaped tubular flux-cored wire or a flux-cored wire internally provided with a central welding wire.

The powder control device comprises a powder control seat, wherein a powder control ratchet wheel for trowelling and compacting brazing flux powder contained in a U-shaped welding strip is arranged on the powder control seat;

the powder control ratchet comprises a ratchet body and pawls uniformly distributed on the outer side of the ratchet body in the circumferential direction, each pawl comprises a plane and a cambered surface, and the edges of the two sides of the cambered surface are provided with chamfers;

the height of the powder control ratchet wheel is adjustable and can rotate around the axis of the powder control ratchet wheel; when the powder control ratchet rotates, the rotation direction of the lowest point of the powder control ratchet is opposite to the advancing direction of the U-shaped welding strip, and the plane of the pawl at the lowest position of the powder control ratchet faces the conveyed U-shaped welding strip and the brazing flux powder contained in the U-shaped welding strip and can prevent the excessive brazing flux powder from being discharged.

In one embodiment, the powder control seat is provided with a rotation mechanism, the powder control ratchet wheel is eccentrically arranged on the rotation mechanism, and when the rotation mechanism rotates, the upper and lower height positions of the powder control ratchet wheel correspondingly change.

In an embodiment, the powder control device further comprises a first pinch roller and a first riding wheel which are correspondingly arranged;

a gap for a U-shaped welding belt containing brazing flux powder to pass through is reserved between the first pressing wheel and the first riding wheel, and the first pressing wheel and the first riding wheel can correspondingly rotate in cooperation with the advancing movement of the U-shaped welding belt containing brazing flux powder, so that the U-shaped welding belt is facilitated to be assisted to advance at a uniform speed better.

Further, the first pressing wheel can be connected with the powder control seat through the first connecting arm, and the first connecting arm can rotate by taking the connecting point of the first connecting arm and the powder control seat as the axis, so that the upper and lower height positions of the first pressing wheel connected with the first connecting arm can be adjusted;

the first riding wheel can be connected with the powder control seat through the second connecting arm, and the second connecting arm can rotate by taking the connecting point of the second connecting arm and the powder control seat as the axis, so that the upper and lower height positions of the first riding wheel connected with the second connecting arm can be adjusted.

The invention also provides a flux-cored wire powder winding machine which comprises a belt unwinding mechanism, a U-shaped roller seat, a powder hopper, the powder control device, a wire winding forming die holder and a winding mechanism which are sequentially arranged;

the unreeling mechanism is used for unreeling the plane welding strip;

the U-shaped roller seat is used for rolling the planar welding strip into a U-shaped welding strip in one step or step by step;

the powder hopper is used for feeding brazing flux powder into the U-shaped groove of the U-shaped welding strip;

the coil wire forming die holder is used for coiling a U-shaped welding coil containing brazing flux powder into a flux-cored welding wire;

the winding mechanism is used for winding the flux-cored wire.

The flux-cored wire powder winding machine can further comprise a first auxiliary powder control device arranged between the powder control device and the wire winding forming die holder.

In an embodiment, the first auxiliary powder control device comprises a first auxiliary powder control seat, a second pressing wheel, a second riding wheel and a pressing rod, wherein the second pressing wheel, the second riding wheel and the pressing rod are sequentially arranged along the advancing direction of the U-shaped welding belt for containing brazing flux powder.

In an embodiment, the second pressing wheel and the second riding wheel are correspondingly arranged, a gap for the U-shaped welding belt containing brazing flux powder to pass through is reserved between the second pressing wheel and the second riding wheel, and the second pressing wheel and the second riding wheel can correspondingly rotate in cooperation with the advancing movement of the U-shaped welding belt containing brazing flux powder, so that the U-shaped welding belt is facilitated to be assisted to advance at a uniform speed.

The second pinch roller accessible third linking arm is connected with first supplementary accuse powder seat, and the third linking arm can be rotated as the axle center with the tie point of first supplementary accuse powder seat, and then adjusts the upper and lower high position of the second pinch roller that links to each other with it.

In one embodiment, the second riding wheel is adjustably and fixedly connected to the first auxiliary powder control seat.

In one embodiment, one end of the pressing rod is fixedly connected to the first auxiliary powder control seat, and the other end of the pressing rod is a movable end for compacting brazing flux powder contained in the U-shaped welding belt. The compression bar can rotate by taking the connecting point of the compression bar and the first auxiliary powder control seat as an axis, so as to adjust the upper and lower height positions of the movable end.

In an embodiment, the flux cored wire powder winding machine further comprises a second auxiliary powder control device arranged between the first auxiliary powder control device and the wire winding forming die holder.

In an embodiment, the second auxiliary powder control device comprises a second auxiliary powder control seat, and a third pressing wheel and a third riding wheel which are correspondingly arranged.

In an embodiment, a gap for the U-shaped welding belt containing brazing flux powder to pass through is reserved between the third pressing wheel and the third supporting wheel, and the third pressing wheel and the third supporting wheel can correspondingly rotate in cooperation with the advancing movement of the U-shaped welding belt containing brazing flux powder, so that the U-shaped welding belt is facilitated to be assisted to advance at a uniform speed better.

The third pinch roller can be connected with the second auxiliary powder control seat through a fourth connecting arm, and the fourth connecting arm can rotate by taking the connecting point of the fourth connecting arm and the second auxiliary powder control seat as the axis, so that the upper and lower height positions of the third pinch roller connected with the fourth connecting arm can be adjusted.

In one embodiment, the third riding wheel is adjustably and fixedly connected to the second auxiliary powder control seat.

In one embodiment, the flux cored wire coiler further comprises a trough for collecting the dropped flux powder. Further, the powder hopper, the powder control device, the first auxiliary powder control device (if any) and the second auxiliary powder control device (if any) can be positioned above the material tank, the material tank can hold brazing flux powder dropped by the powder hopper, the powder control device, the first auxiliary powder control device (if any) and the second auxiliary powder control device (if any), and the brazing flux powder can be collected and added into the powder hopper again for recycling.

In one embodiment, the U-shaped roller seat comprises one or more groups of cams and concave wheels which correspond up and down; the height of the cam is adjustable.

In one embodiment, the cam is arranged in a cam seat, and a handle capable of adjusting the height of the cam seat and further adjusting the spacing between the cam and the concave wheel and the tightness is arranged on the cam seat.

In an embodiment, the winding mechanism comprises a motor, a speed reducer and a winding drum which are sequentially connected, and the winding drum can automatically wind the flux-cored wire output by the wire winding forming die holder under the drive of the motor.

In one embodiment, the flux cored wire powder winder further comprises a wake-up belt wheel seat arranged between the belt unwinding mechanism and the U-shaped roller seat.

In an embodiment, the flux-cored wire powder winding machine further comprises a fourth supporting wheel arranged at the rear end of the wire winding forming die holder, and the fourth supporting wheel can play a role in stabilizing flux-cored wires output by the wire winding forming die holder.

In an embodiment, the flux-cored wire powder winding machine further comprises a wire unwinding mechanism for unwinding the central wire, the central wire unwound by the wire unwinding mechanism is inserted into a U-shaped groove of a U-shaped welding belt containing brazing flux powder at the front end of the wire winding forming die holder, and the flux-cored wire output from the rear end of the wire winding forming die holder contains the central wire.

Compared with the prior art, the invention has the beneficial effects that:

the powder control device and the flux-cored wire powder coiling machine comprising the powder control device are high in quality, low in cost, simple in structure, easy to manufacture, reliable in control, novel and practical, can efficiently level and compact brazing flux powder contained in the U-shaped welding strip, remove excessive brazing flux powder, and can adjust the amount of the leveling and compacting brazing flux powder in the U-shaped welding strip, and the excessive brazing flux powder can be recycled.

Drawings

Fig. 1 is a schematic front view of a powder control device in embodiment 1;

fig. 2 is a schematic side view of the powder control device of embodiment 1 (omitting the first pressing wheel and the first connecting arm);

fig. 3 is a schematic structural diagram of a powder control ratchet in the powder control device of embodiment 1;

fig. 4 is a schematic structural view of a flux cored wire coiler of example 3;

FIG. 5 is a schematic view of the structure of a U-shaped roller seat in a flux cored wire coiler of example 3;

fig. 6 is a schematic structural diagram of a first auxiliary powder control device in the flux cored wire powder winder of embodiment 3;

fig. 7 is a schematic structural diagram of a second auxiliary powder control device in the flux cored wire powder winder of example 3;

fig. 8 is a schematic structural view of a flux cored wire coiler of example 4.

Detailed Description

The invention will be further elucidated with reference to the drawings and to specific embodiments. It is to be understood that these examples are illustrative of the present invention and are not intended to limit the scope of the present invention.

Example 1

Referring to fig. 1 and 2, the powder control device of the present embodiment includes a powder control seat 101, and a first pressing wheel 106 and a first riding wheel 105 that are correspondingly disposed. The powder control seat 101 is provided with an autorotation mechanism 104, and the autorotation mechanism 104 can be a autorotation disc. The rotation mechanism 104 is eccentrically provided with a powder control ratchet 103. The powder control ratchet wheel 103 is used for trowelling and compacting the brazing flux powder 108 contained in the U-shaped welding strip 17.

Referring to fig. 1-3, the powder control ratchet 103 comprises a ratchet body 30 and 8 pawls 31 circumferentially and uniformly distributed on the outer side of the ratchet body 30, each pawl 31 comprises a plane 32 and an arc surface 33, and the edges of two sides of the arc surface 33 are provided with chamfers. The powder control ratchet wheel 103 can rotate around the axis of the powder control ratchet wheel 103, when the powder control ratchet wheel 103 rotates, the rotation direction of the lowest point of the powder control ratchet wheel 103 is opposite to the advancing direction of the U-shaped welding belt 17, the plane 32 of the pawl 31 at the lowest position of the powder control ratchet wheel 103 faces the conveyed U-shaped welding belt 17 and the brazing flux powder contained in the brazing flux powder and can block and discharge excessive brazing flux powder, the cambered surface 33 at the back can play a role of trowelling and compacting the brazing flux powder contained in the U-shaped welding belt 17, and due to the arc design of the cambered surface 33 and the chamfer design of two sides, the powder control ratchet wheel can be matched with the U-shaped groove of the U-shaped welding belt 17 on one hand, and the surface of the pawl 31 can reduce sticky powder on the other hand. For example, as shown in fig. 1, when the U-shaped welding belt 17 containing the brazing flux powder moves from right to left, the powder control ratchet 103 rotates counterclockwise.

Referring to fig. 1, when the rotation mechanism 104 rotates, the vertical height position of the powder control ratchet 103 correspondingly changes. In fig. 1, a locus 102 of revolution of a powder control ratchet 103 around the center of a rotation mechanism 104 is shown. For example, in the state shown in fig. 1, when the rotation mechanism 104 rotates clockwise, the height position of the powder control ratchet wheel 103 is lowered, the pawl 31 penetrates into the U-shaped groove of the U-shaped welding strip 17, the level 32 blocks the discharged brazing flux powder material to be increased, the amount of the brazing flux powder material to be smoothed and compacted in the U-shaped welding strip 17 is reduced, when the rotation mechanism 104 rotates anticlockwise, the height position of the powder control ratchet wheel 103 is raised, the level 32 blocks the discharged brazing flux powder material to be reduced, the amount of the brazing flux powder material to be smoothed and compacted in the U-shaped welding strip 17 is increased, and thus the amount of the brazing flux powder material to be finally contained in the U-shaped welding strip 17 can be adjusted.

Referring to fig. 1 and 2, the rotation mechanism 104 and the powder control ratchet 103 thereon are positioned at the front ends of the first pinch roller 106 and the first riding wheel 105. A gap for the U-shaped welding belt 17 containing brazing flux powder to pass through is reserved between the first pressing wheel 106 and the first riding wheel 105, and the first pressing wheel 106 and the first riding wheel 105 can correspondingly rotate in cooperation with the advancing movement of the U-shaped welding belt 17 containing brazing flux powder. For example, as shown in fig. 1, when the U-shaped welding belt 17 containing the flux powder moves from right to left, the first pressing wheel 106 rotates clockwise, and the first riding wheel 105 rotates counterclockwise.

Referring to fig. 1, the first pressing wheel 106 is connected with the powder control seat 101 through the first connecting arm 108, and the first connecting arm 108 can rotate with the connection point of the first connecting arm and the powder control seat 101 as an axis, so as to adjust the upper and lower height positions of the first pressing wheel 106 connected with the first connecting arm to match the thickness of the soldering flux powder after being smoothed and compacted by the powder control ratchet 103. The first riding wheel 105 is connected with the powder control seat 101 through the second connecting arm 107, the second connecting arm 107 can rotate by taking the connecting point of the second connecting arm and the powder control seat 101 as the axis, and then the upper and lower height positions of the first riding wheel 105 connected with the second connecting arm are adjusted, so that the straightness of the U-shaped welding strip 17 is ensured.

The first pinch roller 106 and the first riding wheel 105 are matched, so that on one hand, the U-shaped welding belt 17 can be supported, the straightness of the U-shaped welding belt 17 is guaranteed, and on the other hand, the brazing flux powder contained in the U-shaped welding belt 17 can be further smoothed and compacted.

Example 2

Compared with embodiment 1, the powder control device of this embodiment is the same except for the absence of the first pinch roller 106, the first riding wheel 105, the first connecting arm 108, and the second connecting arm 107.

Example 3

Referring to fig. 4, the flux-cored wire powder winding machine of the embodiment comprises a trough 16, and a belt unwinding mechanism 1, a belt waking wheel seat 3, a U-shaped roller seat 4, a powder hopper 5, a powder control device 6, a first auxiliary powder control device 7, a second auxiliary powder control device 8, a wire winding forming die holder 9 and a winding mechanism 11 which are sequentially arranged.

The unwinding mechanism 1 is used for unwinding a planar solder strip 2, and may specifically be an unwinding reel.

The wake belt wheel seat 3 can comprise four H-shaped grooved wheels, so that the welding belt is heated and physically denatured through movement. The U-shaped roller seat 4 is used for rolling the plane welding strip 2 into a U-shaped welding strip 17 in one step. Referring to fig. 5, u-shaped roll stand 4 includes a set of upper and lower corresponding cams 402 and concave wheels 403. The height of the cam 402 is adjustable, specifically, the cam 402 is arranged in a cam seat, and a handle 401 capable of adjusting the height of the cam seat and further adjusting the spacing and tightness between the cam 402 and the concave wheel 403 is arranged on the cam seat. Of course, according to practical situations, the U-shaped roller seat 4 may also include a plurality of sets of cams 402 and concave wheels 403 corresponding up and down, and the specific structure and connection relationship between the cams 402 and the concave wheels 403 may be described above, so that the U-shaped roller seat 4 may roll the planar solder strip 2 into the U-shaped solder strip 17 step by step.

The powder hopper 5 is used for feeding brazing flux powder into the U-shaped groove of the U-shaped welding strip 17.

The powder control device 6 is used for trowelling and compacting the brazing flux powder contained in the U-shaped welding strip 17 and blocking the excess brazing flux powder from being discharged, and specifically, the powder control device in embodiment 1 or embodiment 2 can be adopted.

The first auxiliary powder control device 7 and the second auxiliary powder control device 8 are used for further trowelling and compacting brazing flux powder contained in the U-shaped welding strip 17, and meanwhile play a supporting role on the U-shaped welding strip 17, so that the straightness of the U-shaped welding strip 17 is guaranteed.

Referring to fig. 6, the first auxiliary powder control device 7 includes a first auxiliary powder control seat 202, and a second pressing wheel 201, a second supporting wheel 203 and a pressing rod 204 which are sequentially arranged along the advancing direction of the U-shaped welding strip 17 containing brazing flux powder. The second pressing wheel 201 and the second supporting wheel 203 are correspondingly arranged, and have similar working principles and functions as the first pressing wheel 106 and the first supporting wheel 105 in the powder control device of embodiment 1. Specifically, a gap for the U-shaped welding belt 17 containing brazing flux powder to pass through is reserved between the second pressing wheel 201 and the second supporting wheel 203, and the second pressing wheel 201 and the second supporting wheel 203 can correspondingly rotate in cooperation with the advancing movement of the U-shaped welding belt 17 containing brazing flux powder. For example, as shown in fig. 6, when the U-shaped welding belt 17 containing flux powder moves from right to left, the second pressing wheel 201 rotates clockwise, and the second supporting wheel 203 rotates counterclockwise.

Referring to fig. 6, the second pressing wheel 201 is connected with the first auxiliary powder control seat 202 through the third connecting arm 205, and the third connecting arm 205 can rotate with the connection point of the third connecting arm and the first auxiliary powder control seat 202 as an axis, so as to adjust the vertical height position of the second pressing wheel 201 connected with the third connecting arm to match the thickness of the brazing flux powder after being smoothed and compacted by the powder control device 6. The second supporting roller 203 is adjustably and fixedly connected to the first auxiliary powder control seat 202, so as to ensure the straightness of the U-shaped welding strip 17. One end of the pressing rod 204 is fixedly connected to the first auxiliary powder control seat 202, and the other end of the pressing rod is a movable end for further compacting the brazing flux powder contained in the U-shaped welding strip 17. The pressing rod 204 can rotate by taking the connecting point of the pressing rod 204 and the first auxiliary powder control seat 202 as an axis, so as to adjust the upper and lower height positions of the movable end to match the thickness of the soldering flux powder after being smoothed and compacted by the second pressing wheel 201.

Referring to fig. 7, the second auxiliary powder control device 8 includes a second auxiliary powder control seat 302, and a third pressing wheel 301 and a third supporting wheel 303 correspondingly disposed. Third pinch roller 301 and third riding wheel 303 also have similar principles and functions as first pinch roller 106 and first riding wheel 105 in the powder control device of embodiment 1. Specifically, a gap for the passage of the U-shaped welding belt 17 containing the brazing flux powder is reserved between the third pressing wheel 301 and the third supporting wheel 303, and the third pressing wheel 301 and the third supporting wheel 303 can rotate correspondingly in coordination with the forward movement of the U-shaped welding belt 17 containing the brazing flux powder. For example, as shown in fig. 7, when the U-shaped welding belt 17 containing the flux powder moves from right to left, the third pressing wheel 301 rotates clockwise, and the third supporting wheel 303 rotates counterclockwise.

Referring to fig. 7, the third pressing wheel 301 is connected to the second auxiliary powder control seat 302 through the fourth connecting arm 304, and the fourth connecting arm 304 can rotate with the connection point of the fourth connecting arm and the second auxiliary powder control seat 302 as an axis, so as to adjust the vertical height position of the third pressing wheel 301 connected with the fourth connecting arm to match the thickness of the brazing flux powder after being smoothed and compacted by the first auxiliary powder control device 7. The third supporting roller 303 is adjustably and fixedly connected to the second auxiliary powder control seat 302, so as to ensure the straightness of the U-shaped welding strip 17.

The trough 16 is used for collecting the dropped brazing flux powder, and the powder hopper 5, the powder control device 6, the first auxiliary powder control device 7 and the second auxiliary powder control device 8 are all positioned above the trough 16. The brazing flux powder dropped by the powder hopper 5, the powder control device 6, the first auxiliary powder control device 7 and the second auxiliary powder control device 8 can be collected by the trough 16 and added into the hopper 5 again for reuse.

The coil wire forming die holder 9 is used for coiling the U-shaped welding strip 17 containing brazing flux powder into a flux-cored welding wire. The fourth riding wheel 10 is arranged at the rear end of the wire winding forming die holder 9 and can play a role in stabilizing the flux-cored wire output by the wire winding forming die holder.

The winding mechanism 11 is used for winding the flux-cored wire. Referring to fig. 4, the winding mechanism 11 includes a motor 15, a speed reducer 14 and a winding drum 11 which are sequentially connected, and the winding drum 11 can wind the flux-cored wire output by the wire winding forming die holder 9 by autorotation under the driving of the motor 15.

Example 4

Referring to fig. 8, the flux-cored wire coiling machine of this embodiment further includes, on the basis of embodiment 3, a wire uncoiling mechanism 12 for uncoiling the center wire 13, the center wire 13 uncoiled by the wire uncoiling mechanism 12 is inserted into a U-shaped groove of a U-shaped welding strip 17 containing flux powder at the front end of a wire coiling die holder 9, and the center wire 13 is contained in the flux-cored wire output from the rear end of the wire coiling die holder 9.

Further, it will be understood that various changes and modifications may be made by those skilled in the art after reading the foregoing description of the invention, and such equivalents are intended to fall within the scope of the claims appended hereto.

Claims (10)

1. The powder control device is characterized by comprising a powder control seat (101), wherein a powder control ratchet wheel (103) for trowelling and compacting brazing flux powder contained in a U-shaped welding strip (17) is arranged on the powder control seat (101);

the powder control ratchet wheel (103) comprises a ratchet wheel body (30) and pawls (31) circumferentially and uniformly distributed on the outer side of the ratchet wheel body (30), each pawl (31) comprises a plane (32) and a cambered surface (33), and chamfer angles are arranged at the edges of two sides of the cambered surface (33);

the height of the powder control ratchet wheel (103) is adjustable and can rotate around the axis of the powder control ratchet wheel; when the powder control ratchet wheel (103) rotates, the rotation direction of the lowest point of the powder control ratchet wheel (103) is opposite to the advancing direction of the U-shaped welding belt (17), and the plane (32) of the pawl (31) at the lowest position of the powder control ratchet wheel (103) faces the conveyed U-shaped welding belt (17) and the brazing flux powder contained in the U-shaped welding belt and can block the excessive brazing flux powder from being discharged.

2. The powder control device according to claim 1, wherein the powder control seat (101) is provided with a rotation mechanism (104), the powder control ratchet wheel (103) is eccentrically arranged on the rotation mechanism (104), and when the rotation mechanism (104) rotates, the upper and lower height positions of the powder control ratchet wheel (103) correspondingly change.

3. The powder control device according to claim 1, further comprising a first pinch roller (106) and a first riding wheel (105) which are correspondingly arranged;

a gap for a U-shaped welding belt (17) containing brazing flux powder to pass through is reserved between the first pressing wheel (106) and the first riding wheel (105), and the first pressing wheel (106) and the first riding wheel (105) can correspondingly rotate in cooperation with the advancing movement of the U-shaped welding belt (17) containing brazing flux powder.

4. A powder control device according to claim 3, characterized in that the first pressing wheel (106) is connected with the powder control seat (101) through a first connecting arm (108), and the first connecting arm (108) can rotate by taking the connecting point of the first connecting arm and the powder control seat (101) as an axis, so as to adjust the upper and lower height positions of the first pressing wheel (106) connected with the first connecting arm;

the first riding wheel (105) is connected with the powder control seat (101) through the second connecting arm (107), the second connecting arm (107) can rotate by taking the connecting point of the second connecting arm and the powder control seat (101) as the axis, and then the upper and lower height positions of the first riding wheel (105) connected with the second connecting arm are adjusted.

5. A flux-cored wire powder winding machine which is characterized by comprising a belt unwinding mechanism (1), a U-shaped roller seat (4), a powder hopper (5), a powder control device (6) according to any one of claims 1-4, a wire winding forming die holder (9) and a winding mechanism (11) which are sequentially arranged;

the unreeling mechanism (1) is used for unreeling the plane welding strip (2);

the U-shaped roller seat (4) is used for rolling the plane welding strip (2) into a U-shaped welding strip (17) in one step or step by step;

the powder hopper (5) is used for feeding brazing flux powder into the U-shaped groove of the U-shaped welding strip (17);

the coil wire forming die holder (9) is used for coiling a U-shaped welding belt (17) containing brazing flux powder into a flux-cored welding wire;

the winding mechanism (11) is used for winding the flux-cored wire.

6. The flux cored wire coiler according to claim 5, characterized in that it further comprises a first auxiliary powder control device (7) arranged between the powder control device (6) and the wire coiler die holder (9);

the first auxiliary powder control device (7) comprises a first auxiliary powder control seat (202), a second pressing wheel (201), a second riding wheel (203) and a pressing rod (204) which are sequentially arranged along the advancing direction of a U-shaped welding belt (17) for containing brazing flux powder;

the second pressing wheel (201) and the second riding wheel (203) are correspondingly arranged, a gap for the passage of the U-shaped welding belt (17) containing brazing flux powder is reserved between the second pressing wheel and the second riding wheel (203), and the second pressing wheel (201) and the second riding wheel (203) can correspondingly rotate in cooperation with the advancing movement of the U-shaped welding belt (17) containing brazing flux powder;

the second pressing wheel (201) is connected with the first auxiliary powder control seat (202) through a third connecting arm (205), and the third connecting arm (205) can rotate by taking a connecting point of the third connecting arm and the first auxiliary powder control seat (202) as an axis, so that the upper and lower height positions of the second pressing wheel (201) connected with the third connecting arm are adjusted;

the second riding wheel (203) is adjustably and fixedly connected to the first auxiliary powder control seat (202);

one end of a pressing rod (204) is fixedly connected to the first auxiliary powder control seat (202), and the other end of the pressing rod is a movable end for compacting brazing flux powder contained in the U-shaped welding strip (17); the pressing rod (204) can rotate by taking the connecting point of the pressing rod and the first auxiliary powder control seat (202) as an axis, so that the upper and lower height positions of the movable end are adjusted.

7. The flux cored wire coiler according to claim 6, characterized in that it further comprises a second auxiliary powder control device (8) arranged between the first auxiliary powder control device (7) and the wire coiler die holder (9);

the second auxiliary powder control device (8) comprises a second auxiliary powder control seat (302) and a third pressing wheel (301) and a third riding wheel (303) which are correspondingly arranged;

a gap for a U-shaped welding belt (17) containing brazing flux powder to pass through is reserved between the third pressing wheel (301) and the third supporting wheel (303), and the third pressing wheel (301) and the third supporting wheel (303) can correspondingly rotate in cooperation with the advancing movement of the U-shaped welding belt (17) containing brazing flux powder;

the third pressing wheel (301) is connected with the second auxiliary powder control seat (302) through a fourth connecting arm (304), and the fourth connecting arm (304) can rotate by taking a connecting point of the fourth connecting arm and the second auxiliary powder control seat (302) as an axis, so that the upper and lower height positions of the third pressing wheel (301) connected with the fourth connecting arm can be adjusted;

the third riding wheel (303) is adjustably and fixedly connected to the second auxiliary powder control seat (302).

8. The flux cored wire coiler according to claim 7, further comprising a trough (16) for collecting the dropped flux powder, wherein the powder hopper (5), the powder control device (6), the first auxiliary powder control device (7) and the second auxiliary powder control device (8) are all located above the trough (16).

9. The flux cored wire coiler according to claim 5, wherein the U-shaped roller seat (4) comprises one or more sets of cams (402) and concave wheels (403) corresponding up and down; the height of the cam (402) is adjustable; the cam (402) is arranged in the cam seat, and the cam seat is provided with a handle (401) which can adjust the height of the cam seat so as to adjust the interval between the cam (402) and the concave wheel (403) and the tightness;

the winding mechanism (11) comprises a motor (15), a speed reducer (14) and a winding drum (11) which are sequentially connected, and the winding drum (11) can automatically wind the flux-cored wire output by the winding molding die holder (9) under the driving of the motor (15).

10. The flux cored wire coiler according to any of claims 5-9, further comprising:

a wake-up belt wheel seat (3) arranged between the belt releasing mechanism (1) and the U-shaped roller seat (4);

a fourth riding wheel (10) arranged at the rear end of the wire winding forming die holder (9);

the welding wire unreeling mechanism (12) is used for unreeling the central welding wire (13), the central welding wire (13) unreeled by the welding wire unreeling mechanism (12) is inserted into a U-shaped groove of a U-shaped welding belt (17) containing brazing flux powder at the front end of a wire reeling molding die holder (9), and the flux-cored wire output at the rear end of the wire reeling molding die holder (9) contains the central welding wire (13).