An alloy strip precision feeding device for laser cladding

Abstract

This invention relates to the technical field of laser cladding, and in particular to a precision feeding device for alloy strips and sheets used in laser cladding. The device includes a coil uncoiling and feeding mechanism, a laser welding unit, an auxiliary tension control unit, and a bidirectional airflow processing unit. Two auxiliary tension control units are provided, with the laser welding end of the laser welding unit located between the two auxiliary tension control units. The auxiliary tension control units are installed outside the coil uncoiling and feeding mechanism, and the strip passes horizontally through the inside of the two auxiliary tension control units. This invention allows the bidirectional airflow processing unit to first inject cold air into the auxiliary tension control units through a venting end assembly. The cold air cools the alloy strip and sheet it contacts. The bidirectional airflow processing unit then extracts the heated gas, and after complete extraction, it injects new cold air, enabling continuous and efficient cooling of the strip and sheet, thus increasing the conveying accuracy of the strip.

Description

Technical Field

[0001] This invention relates to the field of laser cladding technology, and in particular to a precision feeding device for alloy strips and plates used in laser cladding. Background Technology

[0002] Laser cladding is an advanced surface modification technology that uses a high-energy laser beam to rapidly melt and solidify the cladding material (powder or wire) onto the substrate surface, forming a metallurgically bonded coating with high performance (such as high hardness, wear resistance, and corrosion resistance). This technology is widely used in the repair, strengthening, and functional modification of parts in industrial fields.

[0003] Laser cladding of alloy strips (such as thin / medium-thick plates and strips made of steel, aluminum, titanium, nickel-based alloys, etc.) is a surface modification technology for large-format materials with planar or simple curved surfaces. It achieves strengthening, repair, functionalization, or composite processing by fusing a high-performance coating onto the surface of the strip. Compared to complex-shaped parts, laser cladding of alloy strips emphasizes continuous production, controlled thermal deformation, and large-area uniformity, making it a key technology for increasing product added value in the steel and non-ferrous metal processing industries.

[0004] In existing technologies, alloy strips are gradually pulled out of the coil during laser cladding, and the strip is conveyed under a certain tension. The strip is then passed under the laser cladding head for cladding. However, during cladding, the alloy strip expands and deforms under high-temperature laser radiation. The heat transfer of the alloy strip causes deformation on both sides of the cladding area, affecting the feeding accuracy. Summary of the Invention

[0005] To address the problem of reduced conveying accuracy caused by deformation on both sides of the cladding location due to temperature rise in the alloy strip during laser cladding, this invention provides a precision feeding device for alloy strips used in laser cladding.

[0006] The present invention provides a precision feeding device for alloy strips and plates for laser cladding, which adopts the following technical solution: including a coil uncoiling and feeding mechanism, a laser welding unit, an auxiliary tension control unit, and a bidirectional airflow processing unit.

[0007] The uncoiling and feeding mechanism can pull out the coiled strip and then transport it horizontally.

[0008] The laser welding unit is installed on one side of the coil uncoiling and feeding mechanism. The conveyed sheet material is positioned below the laser welding end of the laser welding unit. The welding end of the laser welding unit can move horizontally and longitudinally on the upper side of the sheet material.

[0009] There are two auxiliary tension control units. The laser welding end of the laser welding unit is located between the two auxiliary tension control units. The auxiliary tension control units are installed on the outside of the coil uncoiling and feeding mechanism. The strip passes horizontally through the inside of the two auxiliary tension control units. The auxiliary tension control units apply resistance to the passing strip. Ventilation end components are installed on both the upper and lower sides of the auxiliary tension control units.

[0010] The bidirectional airflow processing unit is capable of alternately supplying and extracting cold air into the ventilated end assembly, and is connected to two auxiliary tension control units.

[0011] Optionally, the auxiliary tension control unit includes: The outer enclosure is enclosed, and the strip passes through the inside of the enclosure. The ventilated end assembly is installed on the upper and lower surfaces of the enclosure, which is installed on the outside of the roll unwinding and feeding mechanism.

[0012] Two elastic sealing plates are provided, which are respectively installed at both ends of the enclosed outer cover box. The plate strip passes through the elastic sealing plates, and the inner side of the elastic sealing plate is in sealed contact with the plate material.

[0013] Optionally, the auxiliary tension control unit also includes multiple elastic separator wheels, which are arranged in two rows. The two rows of elastic separator wheels are symmetrically located on the upper and lower sides of the belt, and the elastic separator wheels are rotatably installed inside the enclosed outer casing.

[0014] The elastic separator wheel is provided with two separator plates on the side away from the axis of the connected enclosed outer casing. The separator plates are fixedly inserted into the inside of the enclosed outer casing.

[0015] Optionally, the ventilated end assembly includes multiple ventilated plates and a connecting ventilated plate frame. The ventilated plates are installed through the outside of the closed outer cover box. The number of ventilated plates is one less than the number of elastic dividing wheels located on the same side of the conveying belt. The multiple ventilated plates and multiple elastic dividing plates are alternately arranged. The ventilated plates are perforated at the end near the belt.

[0016] The ventilated plate is fixed to the connecting air plate frame at one end outside the closed outer cover box. The connecting air plate frame is connected to the inside of the ventilated plate. A longitudinal cover tube is vertically fixed at the end of the connecting air plate frame away from the closed outer cover box. The connection end of the longitudinal cover tube and the connecting air plate frame is connected. The air outlet and air extraction end of the bidirectional airflow treatment unit are installed inside the longitudinal cover tube.

[0017] Optionally, the bidirectional airflow processing unit includes: A telescopic drive frame, one end of which is connected to two enclosed outer casings.

[0018] The bidirectional airflow assembly has four components. The bidirectional airflow assemblies are connected to the telescopic drive frame. The four bidirectional airflow assemblies are respectively installed inside the four longitudinal hood tubes. When the telescopic drive frame drives the bidirectional airflow assemblies to move inside the longitudinal hood tubes, it respectively fills the connecting air plate frame with cold air and extracts the heated gas. A filter storage component is installed in the air extraction end of the bidirectional airflow assembly.

[0019] Optionally, the bidirectional airflow assembly includes a single-end tube, and two single-end tubes are provided. The bottom surface of the single-end tube is provided with a vent hole. The single-end tube is slidably inserted into the interior of the longitudinal cover tube. The two single-end tubes are fixed close to each other at one end. One of the two single-end tubes is located outside the longitudinal cover tube and has an air inlet tube fixed at one end. The other single-end tube is located outside the longitudinal cover tube and is connected to the filter storage assembly at one end. The filter storage assembly is equipped with an air extraction tube at the other end.

[0020] The telescopic drive frame is fixed to one of the two single-end tubes, and the two single-end tubes are closed at one end when they are close to each other.

[0021] Optionally, the filter storage component includes: The reducing pipe has a large diameter end in the middle. The reducing pipe is coaxially installed with the adjacent single-end pipe. The end of the exhaust pipe closest to the closed outer casing has a large diameter end. The outer diameter of the large diameter end of the reducing pipe is smaller than the inner diameter of the large diameter end of the exhaust pipe.

[0022] The filter disc is fixedly inserted into the large diameter end of the reducing pipe.

[0023] A central column is coaxially disposed inside the reducing tube and fixedly inserted into the inside of the filter disc. The central column and the reducing tube are spaced apart. The inner diameter of the filter disc is larger than the outer diameter of the reducing tube near the central column. The central column and the reducing tube are coaxially fixedly installed.

[0024] The air pressure plug rod is slidably sleeved on the outer surface of the air pressure plug rod, and the air pressure plug rod is elastically connected to the shaft column. The outer diameter of one end of the air pressure plug rod inside the variable diameter tube is adapted to the inner diameter of the end of the variable diameter tube closer to the closed outer casing. The outer diameter of the end of the variable diameter tube away from the closed outer casing is smaller than the inner diameter of the filter disc.

[0025] It also includes a threaded sealing cylinder, which is threadedly sleeved on the outside of the extraction pipe, and a sealing disc is slidably inserted into the other end of the threaded sealing cylinder, which is fixedly sleeved on the outside of the single-end pipe.

[0026] Optionally, the filter disc is conical in shape, with the larger diameter end near the enclosed outer casing.

[0027] Optionally, the filter disc is provided with multiple vibrating telescopic rods on the side away from the enclosed outer casing, and the other end of the vibrating telescopic rods is fixed to the air pressure blocking rod.

[0028] Multiple vibrating telescopic rods are evenly arranged in a circular array around the axis of the filter disc.

[0029] In summary, the present invention has the following beneficial technical effects: This invention utilizes an auxiliary tension control unit, a ventilated end assembly, and a bidirectional airflow processing unit. The bidirectional airflow processing unit first introduces cold air into the auxiliary tension control unit through the ventilated end assembly. The cold air cools the alloy strip it contacts. As the temperature of the cold air rises due to heat exchange, the bidirectional airflow processing unit then extracts the heated gas. After complete extraction, new cold air is introduced into the unit. This allows for continuous and efficient cooling of the strip, reducing the impact of temperature during laser cladding on the deformation of the sheet material, minimizing the degree of deformation during conveying, and increasing the conveying accuracy of the strip.

[0030] This invention utilizes the combined use of elastic sealing plates, elastic dividing wheels, and dividing plates. The elastic sealing plates on both sides of the enclosed outer casing elastically contact the conveying strip under their own elasticity, forming a closed space at both ends of the enclosed outer casing. The elastic dividing wheels and dividing plates divide the interior of the enclosed outer casing into multiple spaces. Multiple ventilated plates respectively fill and extract cold air into the multiple divided spaces, further increasing the cooling effect of the cold air on the alloy strip and effectively preventing the cold air from not being able to fully contact the strip and absorb heat when the space is large.

[0031] This invention utilizes a filtration and storage component. When cold air is directed toward the conveying conveyor belt to form an impact airflow, impurities adhering to the belt surface are detached under the airflow. Uncoated belts are cleaned, increasing the cleanliness of the belt during the coating process. After the coated belt is impacted by cold air, the slag generated during coating is cleaned up. Then, during the air extraction process, the generated impurities are extracted from the sealed outer casing. The filtration and storage component then filters the extracted airflow and stores the impurities. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the overall structure in an embodiment of the present invention; Figure 2 This is a schematic diagram of the rear axle side structure in an embodiment of the present invention; Figure 3 This is a front view structural diagram in an embodiment of the present invention; Figure 4 This is a schematic diagram of the distribution of the enclosed outer casing and the laser welding unit in an embodiment of the present invention; Figure 5 This is a top view schematic diagram of some structures in an embodiment of the present invention; Figure 6 This is a schematic diagram of the internal structure distribution of the enclosed outer casing in an embodiment of the present invention; Figure 7 This is a schematic diagram of the structure connecting the air plate frame and the air permeable plate in an embodiment of the present invention; Figure 8 This is a schematic diagram of the connection between the filter disc and the air extraction pipe in an embodiment of the present invention; Figure 9 This is a schematic diagram of the distribution of the variable diameter pipe and the air pressure plug rod in an embodiment of the present invention.

[0033] Reference numerals: 1. Coil unwinding and feeding mechanism; 2. Laser welding unit; 3. Auxiliary tension control unit; 31. Enclosed outer cover box; 32. Elastic sealing plate; 33. Elastic separator wheel; 34. Separator plate; 4. Ventilation end assembly; 41. Ventilation plate; 42. Connecting air plate frame; 43. Longitudinal cover tube; 5. Bidirectional airflow treatment unit; 51. Telescopic drive frame; 52. Bidirectional airflow assembly; 521. Single-end tube; 522. Ventilation hole; 523. Inflation tube; 524. Extraction tube; 53. Filter storage assembly; 531. Variable diameter tube; 532. Filter disc; 5321. Vibrating telescopic rod; 533. Shaft column; 534. Air pressure plug rod; 535. Threaded sealing cylinder; 536. Sealing disc. Detailed Implementation

[0034] The following is in conjunction with the appendix Figures 1-9 The present invention will be described in further detail below.

[0035] This invention discloses a precision feeding device for alloy strips and plates used in laser cladding. For example... Figures 1-3 As shown, it includes a coil uncoiling and feeding mechanism 1, a laser welding unit 2, an auxiliary tension control unit 3, and a bidirectional airflow processing unit 5.

[0036] The coil uncoiling and feeding mechanism 1 can pull out the coiled strip and then transport it horizontally.

[0037] In this embodiment, the unwinding and feeding mechanism 1 is equipped with a shaft rotation structure that can coaxially fix the roll. When the strip is pulled out from the roll, it can drive the roll to rotate. At the same time, multiple sets of drive structures consisting of two wheels that can be powered to rotate are also installed. After the strip passes between the two wheels, it can drive the strip to move. The powered rotating wheels are driven by a motor.

[0038] The laser welding unit 2 is installed on one side of the coil uncoiling and feeding mechanism 1. The conveyed sheet material is set below the laser welding end of the laser welding unit 2. The welding end of the laser welding unit 2 can move horizontally and longitudinally on the upper side of the sheet material.

[0039] In this embodiment, the welding end of the laser welding unit 2 is the laser end and the cladding material outlet end. The upper side of the laser welding unit 2 is equipped with a drive cylinder that can extend and retract laterally and a threaded rod that drives the laser welding end to move longitudinally. The threaded rod is driven by a servo motor, which controls the laser welding end to follow the movement of the strip to perform planar cladding processing.

[0040] There are two auxiliary tension control units 3. The laser welding end of the laser welding unit 2 is located between the two auxiliary tension control units 3. The auxiliary tension control units 3 are installed on the outside of the coil uncoiling and feeding mechanism 1. The strip passes horizontally through the inside of the two auxiliary tension control units 3. The auxiliary tension control units 3 apply resistance to the passing strip. The upper and lower sides of the auxiliary tension control units 3 are equipped with ventilated end components 4.

[0041] The bidirectional airflow processing unit 5 is capable of alternately supplying and extracting cold air into the ventilated end assembly 4. The bidirectional airflow processing unit 5 is connected to two auxiliary tension control units 3.

[0042] In use, the bidirectional airflow processing unit 5 injects cold air into the auxiliary tension control unit 3 through the vent end component 4 and extracts the heated cold air. The injected cold air contacts the heated strip and absorbs heat, cooling the strip. Then, after the heated gas is extracted, new cold air is injected again, so that the strip can be continuously and efficiently cooled. Compared with flowing cold air, completely extracting the heated cold air prevents the heated cold air from mixing with the newly injected cold air, which would cause the cold air to absorb heat from the heated gas but not absorb heat from the strip in time.

[0043] In this embodiment, as Figures 4-7 As shown, the auxiliary tension control unit 3 includes a closed outer casing 31, an elastic sealing plate 32, and multiple elastic dividing wheels 33.

[0044] The strip passes through the inside of the enclosed outer cover box 31. The ventilated end assembly 4 is installed on the upper and lower surfaces of the enclosed outer cover box 31. The enclosed outer cover box 31 is installed on the outside of the coil unwinding and feeding mechanism 1. There are two elastic sealing plates 32. The two elastic sealing plates 32 are installed at both ends of the enclosed outer cover box 31 respectively. The strip passes through the elastic sealing plate 32, and the inner side of the elastic sealing plate 32 is in sealed contact with the strip.

[0045] In this embodiment, the elastic sealing plate 32 is made of a high-temperature resistant and friction-resistant elastic material. When the strip passes through the elastic sealing plate 32, the elastic properties of the elastic sealing plate 32 are fully in contact with the surface of the moving strip to prevent gas leakage. At the same time, the elastic contact between the elastic sealing plate 32 and the strip applies resistance to the movement of the strip. The strip between the two closed outer casings 31 is tightened by the resistance, which increases the stability during laser cladding.

[0046] Multiple elastic separator wheels 33 are arranged in two rows, with the two rows of elastic separator wheels 33 symmetrically located on the upper and lower sides of the belt. The elastic separator wheels 33 are rotatably installed inside the enclosed outer casing 31.

[0047] Two partition plates 34 are provided on the side of the elastic partition wheel 33 away from the axis of the connected enclosed outer casing 31, and the partition plates 34 are fixedly inserted into the inside of the enclosed outer casing 31.

[0048] In this embodiment, the elastic dividing wheel 33 is made of a high-temperature resistant and friction-resistant elastic material. During the movement of the conveyor belt, the elastic dividing wheel 33 rolls synchronously with the movement of the conveyor belt. At the same time, multiple elastic dividing wheels 33 and multiple dividing plates 34 divide the space inside the closed outer casing 31 into multiple individual spaces, reducing the movement trajectory of the cold air filled into the closed outer casing 31 inside, so that the cold air can quickly contact the conveyor belt for cooling.

[0049] The ventilated end assembly 4 includes multiple ventilated plates 41 and a connecting air plate frame 42. The ventilated plates 41 are installed through the outside of the enclosed outer cover box 31. The number of ventilated plates 41 is one less than the number of elastic separator wheels 33 located on the same side of the conveyed belt. The multiple ventilated plates 41 and multiple elastic separator plates 34 are arranged alternately. The ventilated plate 41 has a perforated shape near the end of the belt. When cold air is injected into the ventilated plate 41, the cold air forms an impact airflow through the perforation of the ventilated plate 41 onto the belt, which cools the surface of the belt in time. At the same time, the impact airflow can clean the impurities and debris attached to the surface of the belt, increasing the cleanliness of the surface during cladding.

[0050] The vent plate 41 is located outside the closed outer cover box 31 and is fixed to the connecting air plate frame 42. The connecting air plate frame 42 is connected to the inside of the vent plate 41. The connecting air plate frame 42 is vertically fixed to the end away from the closed outer cover box 31. The connecting end of the longitudinal cover tube 43 and the connecting air plate frame 42 are connected. The air outlet and air extraction end of the bidirectional airflow treatment unit 5 are installed inside the longitudinal cover tube 43.

[0051] The bidirectional airflow processing unit 5 includes a telescopic drive frame 51 and a bidirectional airflow assembly 52.

[0052] One end of the telescopic drive frame 51 is connected to two enclosed outer casings 31. Four bidirectional airflow components 52 are provided. The bidirectional airflow components 52 are connected to the telescopic drive frame 51. The four bidirectional airflow components 52 are respectively installed in the four longitudinal casing tubes 43. When the telescopic drive frame 51 drives the bidirectional airflow components 52 to move in the longitudinal casing tubes 43, it respectively fills cold air into the connecting air plate frame 42 and extracts the heated gas. A filter storage component 53 is installed in the air extraction end of the bidirectional airflow component 52.

[0053] In this embodiment, the telescopic drive frame 51 consists of a drive cylinder and two plates. The two plates are respectively connected to the two ends of the drive cylinder. Two enclosed outer casings 31 are connected to one of the plates. When the drive cylinder extends or retracts, it can drive the bidirectional airflow assembly 52 to move within the longitudinal cover tube 43.

[0054] The bidirectional airflow assembly 52 includes two single-end tubes 521. Each single-end tube 521 has a vent hole 522 on its bottom surface. The single-end tube 521 is slidably inserted into the interior of the longitudinal cover tube 43. The two single-end tubes 521 are fixed at one end close to each other. One of the single-end tubes 521 is located outside the longitudinal cover tube 43 and has an inflation tube 523 fixed at one end. The other single-end tube 521 is located outside the longitudinal cover tube 43 and is connected to the filter storage assembly 53 at one end. The filter storage assembly 53 has an air extraction tube 524 installed at the other end. The telescopic drive frame 51 can drive the vent holes 522 of the two single-end tubes 521 to alternately communicate with the interior of the connecting air plate frame 42.

[0055] The telescopic drive frame 51 is fixed to one of the two single-end tubes 521, and the two single-end tubes 521 are closed at one end when they are close to each other.

[0056] In this embodiment, the air extraction pipe 524 is connected to the air extraction device to perform air extraction operation in the air extraction pipe 524, and the air filling pipe 523 is connected to the cold air supply device to fill the corresponding single-end pipe 521 with cold air through the air filling pipe 523.

[0057] In this embodiment, as Figures 8-9 As shown, the filter storage assembly 53 includes a reducer 531, a filter disc 532, a spindle 533, a pneumatic plug 534, and a threaded sealing cylinder 535.

[0058] The middle part of the reducer 531 is the large diameter end. The reducer 531 is coaxially installed with the adjacent single-end pipe 521. The end of the exhaust pipe 524 near the closed outer casing 31 is the large diameter end. The outer diameter of the large diameter end of the reducer 531 is smaller than the inner diameter of the large diameter end of the exhaust pipe 524. The filter disc 532 is fixedly inserted into the large diameter end of the reducer 531.

[0059] The spindle 533 is coaxially arranged inside the reducer 531. The spindle 533 is fixedly inserted into the filter disc 532. The spindle 533 and the reducer 531 are spaced apart. The inner diameter of the filter disc 532 is larger than the outer diameter of the reducer 531 near the spindle 533. The spindle 533 and the reducer 531 are coaxially fixedly installed.

[0060] The spindle 533 is slidably sleeved on the outer surface of the pneumatic plug rod 534. The pneumatic plug rod 534 is elastically connected to the spindle 533. The outer diameter of one end of the pneumatic plug rod 534 inside the reducer tube 531 is matched with the inner diameter of the end of the reducer tube 531 near the closed outer cover box 31. The outer diameter of the end of the reducer tube 531 away from the closed outer cover box 31 is smaller than the inner diameter of the filter disc 532. The filter disc 532 is conical in shape, and the end of the filter disc 532 near the closed outer cover box 31 is the large diameter end.

[0061] The threaded sealing cylinder 535 is threadedly sleeved on the outside of the air extraction pipe 524. The other end of the threaded sealing cylinder 535 is sealed and slidably inserted with a sealing disc 536, which is fixedly sleeved on the outside of the single-end pipe 521.

[0062] When the vent 522 corresponding to the suction pipe 524 is connected to the connecting air plate frame 42, the suction device provides suction force to the suction pipe 524. Under the suction force, the air pressure plug rod 534 moves to the large diameter end of the reducer 531, so that the suction pipe 524 passes through the gap between the air pressure plug rod 534 and the reducer 531 to extract the heated gas in the sealed outer casing 31. When the extracted airflow passes through the filter plate 532, the filter plate 532 filters the impurities in the airflow. After the vent 522 corresponding to the suction pipe 524 is misaligned with the connecting air plate frame 42, the suction device stops providing suction force to the suction pipe 524, and the air pressure plug rod 534 re-seals the reducer 531 under the elastic connection with the shaft column 533.

[0063] Multiple vibrating telescopic rods 5321 are arranged on the side of the filter disc 532 away from the closed outer casing 31. The other end of the vibrating telescopic rod 5321 is fixed to the air pressure blocking rod 534. The multiple vibrating telescopic rods 5321 are evenly arranged in a circular array around the axis of the filter disc 532.

[0064] As the air pressure plug 534 reciprocates within the reducing pipe 531, it drives the vibrating telescopic rod 5321 to strike the filter disc 532, effectively preventing impurities from clogging the filter disc 532. Simultaneously, when it is necessary to clean internal impurities, the rotating threaded sealing cylinder 535 engages with the suction pipe 524, disengaging from the blockage of the internal space and enabling the cleaning of internal impurities.

[0065] In this application, airtight structures are installed between the structures within the gas flow path to increase airtightness and reduce gas leakage. Bearings are installed at the rotating parts of the rod-shaped structure to improve rotational smoothness and reduce wear.

[0066] The working principle is as follows: The coiled material is installed in the coil uncoiling and feeding mechanism 1. After the coil is pulled out, it is horizontally conveyed so that the strip passes through two auxiliary tension control units 3 and then passes through the laser welding unit 2. The auxiliary tension control units 3 apply resistance to the conveying of the strip and apply resistance to the strip on both sides of the laser welding unit 2 to reduce the deformation of the strip after heating. The bidirectional airflow treatment unit 5 first fills the auxiliary tension control unit 3 with cold air through the vent end component 4. The cold air cools the alloy strip it contacts. Due to the heat exchange, the temperature of the cold air increases. The bidirectional airflow treatment unit 5 then extracts the heated gas. After it is completely extracted, new cold air is filled into the interior, which can continuously perform high-efficiency cooling treatment on the strip.

[0067] The above are all preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A precision feeding device for alloy strips and plates used in laser cladding, characterized in that, include: The coil uncoiling and feeding mechanism (1) can pull out the coiled strip and then transport it horizontally. Laser welding unit (2), the laser welding unit (2) is installed on one side of the coil uncoiling and feeding mechanism (1), the conveyed plate is set on the lower side of the laser welding end of the laser welding unit (2), and the welding end of the laser welding unit (2) can move horizontally and longitudinally on the upper side of the plate; Auxiliary tension control unit (3) is provided in two. The laser welding end of the laser welding unit (2) is located between the two auxiliary tension control units (3). The auxiliary tension control unit (3) is installed on the outside of the coil unwinding and feeding mechanism (1). The strip passes through horizontally from the inside of the two auxiliary tension control units (3). The auxiliary tension control unit (3) applies resistance to the passing strip. The upper and lower sides of the auxiliary tension control unit (3) are equipped with ventilated end components (4). It also includes a bidirectional airflow processing unit (5), which is capable of alternately supplying and extracting cold air into the breathable end assembly (4), and the bidirectional airflow processing unit (5) is connected to two auxiliary tension control units (3).

2. The precision feeding device for alloy strips and plates for laser cladding according to claim 1, characterized in that: The auxiliary tension control unit (3) includes: The closed outer cover box (31) is used to pass through the inside of the closed outer cover box (31). The ventilation end assembly (4) is installed on the upper and lower surfaces of the closed outer cover box (31). The closed outer cover box (31) is installed on the outside of the coil unwinding and feeding mechanism (1). Two elastic sealing plates (32) are provided. The two elastic sealing plates (32) are respectively installed at both ends of the closed outer cover box (31). The plate strip passes through the elastic sealing plate (32), and the inner side of the elastic sealing plate (32) is in sealed contact with the plate material.

3. The precision feeding device for alloy strips and plates for laser cladding according to claim 2, characterized in that: The auxiliary tension control unit (3) also includes multiple elastic separator wheels (33). The multiple elastic separator wheels (33) are arranged in two rows. The two rows of elastic separator wheels (33) are symmetrically located on the upper and lower sides of the belt. The elastic separator wheels (33) are rotatably installed inside the closed outer casing (31). The elastic separator wheel (33) is provided with two separator plates (34) on the side away from the axis of the connected closed outer casing (31), and the separator plates (34) are fixedly inserted into the inside of the closed outer casing (31).

4. The precision feeding device for alloy strips and plates for laser cladding according to claim 3, characterized in that: The ventilated end assembly (4) includes multiple ventilated plates (41) and a connecting air plate frame (42). The ventilated plates (41) are installed through the outside of the closed outer cover box (31). The number of ventilated plates (41) is one less than the number of elastic separator wheels (33) located on the same side of the conveying belt. The multiple ventilated plates (41) and multiple elastic separator plates (34) are alternately arranged. The ventilated plates (41) are perforated near the end of the belt. The ventilated plate (41) is fixed to the connecting air plate frame (42) at one end outside the closed outer cover box (31). The connecting air plate frame (42) is connected to the inside of the ventilated plate (41). A longitudinal cover tube (43) is vertically fixed at the end of the connecting air plate frame (42) away from the closed outer cover box (31). The connecting end of the longitudinal cover tube (43) and the connecting air plate frame (42) are connected. The air outlet and air extraction end of the bidirectional airflow processing unit (5) are installed inside the longitudinal cover tube (43).

5. A precision feeding device for alloy strips and plates for laser cladding according to claim 4, characterized in that: The bidirectional airflow processing unit (5) includes: Telescopic drive frame (51), one end of which is connected to two enclosed outer casings (31); The bidirectional airflow assembly (52) is provided in four parts. The bidirectional airflow assembly (52) is connected to the telescopic drive frame (51). The four bidirectional airflow assemblies (52) are respectively installed in the four longitudinal cover tubes (43). When the telescopic drive frame (51) drives the bidirectional airflow assembly (52) to move in the longitudinal cover tube (43), it respectively fills the connecting air plate frame (42) with cold air and extracts the heated gas. The air extraction end of the bidirectional airflow assembly (52) is equipped with a filter storage assembly (53).

6. A precision feeding device for alloy strips and plates for laser cladding according to claim 5, characterized in that: The bidirectional airflow assembly (52) includes a single-end tube (521), and there are two single-end tubes (521). The bottom surface of the single-end tube (521) is provided with a vent hole (522). The single-end tube (521) is sealed and slidably inserted into the interior of the longitudinal cover tube (43). The two single-end tubes (521) are fixed close to each other at one end. One of the two single-end tubes (521) is located outside the longitudinal cover tube (43) and has an inflation tube (523) fixed at one end. The other single-end tube (521) is located outside the longitudinal cover tube (43) and is connected to the filter storage assembly (53). The other end of the filter storage assembly (53) is equipped with an air extraction tube (524). The telescopic drive frame (51) is fixed to one of the two single-end tubes (521), and the two single-end tubes (521) are closed at one end when they are close to each other.

7. A precision feeding device for alloy strips and plates for laser cladding according to claim 6, characterized in that: The filter storage component (53) includes: The reducing pipe (531) has a large diameter end in the middle. The reducing pipe (531) is coaxially installed with the adjacent single-end pipe (521). The end of the exhaust pipe (524) near the closed outer casing (31) is the large diameter end. The outer diameter of the large diameter end of the reducing pipe (531) is smaller than the inner diameter of the large diameter end of the exhaust pipe (524). The filter disc (532) is fixedly inserted into the large diameter end of the reducer (531); A spindle (533) is coaxially disposed inside the reducing tube (531). The spindle (533) is fixedly inserted into the inside of the filter disc (532). The spindle (533) and the reducing tube (531) are spaced apart. The inner diameter of the filter disc (532) is larger than the outer diameter of the reducing tube (531) near the spindle (533). The spindle (533) and the reducing tube (531) are coaxially fixedly installed. The air pressure plug rod (534) is slidably sleeved on the outer surface of the air pressure plug rod (534). The air pressure plug rod (534) and the shaft column (533) are elastically connected. The outer diameter of one end of the air pressure plug rod (534) inside the reducer (531) is matched with the inner diameter of the reducer (531) near the closed outer cover box (31). The outer diameter of the reducer (531) away from the closed outer cover box (31) is smaller than the inner diameter of the filter disc (532). It also includes a threaded sealing cylinder (535), which is threadedly sleeved on the outside of the air extraction pipe (524). The other end of the threaded sealing cylinder (535) is sealed and slidably inserted with a sealing disc (536), which is fixedly sleeved on the outside of the single-end pipe (521).

8. A precision feeding device for alloy strips and plates for laser cladding according to claim 7, characterized in that: The filter disc (532) is conical in shape, with the end of the filter disc (532) near the closed outer casing (31) being the larger diameter end.

9. A precision feeding device for alloy strips and plates for laser cladding according to claim 7, characterized in that: The filter disc (532) is provided with multiple vibrating telescopic rods (5321) on the side away from the closed outer casing (31), and the other end of the vibrating telescopic rods (5321) is fixed to the air pressure blocking rod (534); Multiple oscillating telescopic rods (5321) are evenly arranged in a circumferential array around the axis of the filter disc (532).

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