Retaining mechanism suitable for wire feeding device and wire feeding device comprising retaining mechanism

Abstract

The utility model discloses a retaining mechanism suitable for a wire feeding device and the wire feeding device comprising the retaining mechanism, which belong to the field of laser welding equipment and comprise a shell and a cover plate, and an accommodating cavity capable of accommodating two retaining units is formed between the shell and the cover plate. By means of the two welding wire holes in the shell and the combined arrangement of the pressing wheels, the ratchet wheels, the ratchet wheel claws, the first floating blocks, the second floating blocks and the corresponding pressing pieces in the two retaining units, welding wires can be accurately fed under clamping rotation of the two pressing wheels, rotation of the ratchet wheels is accurately locked through the ratchet wheel claws when the two pressing wheels rotate reversely, and therefore retaining operation of the welding wires is achieved. The retaining mechanism suitable for the wire feeding device is compact in structure, convenient and fast to set and use, capable of guaranteeing accurate feeding of the welding wires and effectively avoiding retreating of the welding wires at the same time, further improves feeding accuracy of the welding wires at the position to be welded, improves quality and precision of laser brazing, and has good practical value.

Description

Technical Field

[0001] The utility model belongs to the field of laser welding equipment, and particularly relates to a wire feeding stop mechanism applicable to a wire feeding device and a wire feeding device including the same. Background Art

[0002] With the continuous development of industrial technology, the demand for welding technology is getting higher and higher, and higher requirements are also put forward for the quality and efficiency of welding. Compared with traditional welding methods, laser brazing is widely used in fields such as automobiles, aerospace, and ships because of its advantages such as high welding precision and good welding quality.

[0003] In the process of laser brazing, the wire feeding process of the welding wire is often essential, and a special wire feeding device usually needs to be set for the laser welding equipment. At present, in the conventional laser brazing process, the wire feeding device adopted more is generally remote wire feeding, that is, the welding wire is sent to the welding position from the remote end through a wire conduit, and the length of its clamping and wire feeding is often more than 1m.

[0004] Although the above wire feeding device and wire feeding method can meet the wire feeding requirements of welding to a certain extent, however, because the travel of the welding wire in the wire conduit is long, and the inner diameter of the guiding tube is generally larger than the outer diameter of the welding wire, so after the wire comes out at the welding position, the welding wire often slightly retracts when pressing down for welding, affecting the stability and accuracy of welding. Summary of the Utility Model

[0005] In view of one or more of the above defects or improvement requirements of the prior art, the utility model provides a wire feeding stop mechanism applicable to a wire feeding device and a wire feeding device including the same, which can accurately realize the stop of the welding wire during the wire feeding process, ensure the accuracy of the welding wire feeding, and improve the precision and quality of welding.

[0006] To achieve the above object, on one hand, the utility model provides a wire feeding stop mechanism applicable to a wire feeding device, which includes a cover plate and a housing with an opening on one side; the cover plate is detachably connected to the opening of the housing, and a receiving cavity is formed between the two;

[0007] The two sides of the housing are coaxially provided with wire holes penetrating through the receiving cavity, and a pair of stop units are arranged in the receiving cavity, and the two stop units are respectively arranged on both sides of the axis of the wire hole;

[0008] The stop unit includes a pressure wheel and a ratchet wheel coaxially arranged on the outer circumference of the first rotating shaft and capable of rotating synchronously, and a ratchet pawl is rotatably connected to one side of the ratchet wheel through a second rotating shaft; the pressure wheels of the two stop units are arranged opposite to each other, so that the welding wire can be clamped by the two pressure wheels and continuously fed; the ratchet pawl does not hinder the rotation of the corresponding ratchet wheel when the welding wire is fed, and locks the ratchet wheel when the welding wire retracts; and

[0009] The anti-backward unit further includes a first floating block and a second floating block respectively disposed at two ends of the first rotating shaft. The two ends of the first rotating shaft are respectively rotatably connected to the two floating blocks; and on one side of the two anti-backward units facing away from each other, first pressing members are respectively provided corresponding to the two floating blocks, for applying an inward acting force to the two anti-backward units, so that the two pressing wheels can radially press the welding wire during the feeding of the welding wire.

[0010] As a further improvement of the present utility model, second pressing members are respectively provided on two sides of the two ratchet pawls facing away from each other, for applying acting forces to the two ratchet pawls respectively and making the ends of the two ratchet pawls always contact the outer periphery of the corresponding ratchet wheel.

[0011] As a further improvement of the present utility model, the first pressing member and / or the second pressing member is a compression spring, and a pressure adjusting member is provided on the outer peripheral wall surface of the housing corresponding to the compression spring; one end of the pressure adjusting member acts on the end of the compression spring, for adjusting the pressure of the compression spring by changing the compression amount of the compression spring.

[0012] As a further improvement of the present utility model, the two ends of the first rotating shaft are respectively rotatably connected to the corresponding floating blocks through bearings;

[0013] and / or,

[0014] The ratchet pawl is rotatably connected to the first floating block through a second rotating shaft.

[0015] As a further improvement of the present utility model, on the bottom surface of the housing facing the cover plate and / or on the end surface of the cover plate facing the housing, strip-shaped partition ribs parallel to the end surface of the floating block and protruding are provided, and when the end surfaces of the corresponding floating blocks of the two anti-backward units abut against both sides of the partition ribs, a gap with a width not greater than the outer diameter of the welding wire is formed between the two pressing wheels.

[0016] As a further improvement of the present utility model, connection heads are respectively provided on two sides of the outer periphery of the housing corresponding to the two welding wire holes, for the connection and installation of the anti-backward mechanism on the wire feeding tube.

[0017] As a further improvement of the present utility model, a knurled pattern is circumferentially provided on the outer periphery of the pressing wheel.

[0018] As a further improvement of the present utility model, the pressing wheel and the ratchet wheel are respectively sleeved on the outer periphery of the first rotating shaft and fixed with a flat key to form a synchronous rotating body structure.

[0019] Another aspect of the present utility model further provides a wire feeding device, which includes the anti-backward mechanism applicable to the wire feeding device; and

[0020] The wire feeding device further includes wire feeding tubes respectively arranged at two ends of the anti-retreat mechanism and coaxially connected to the anti-retreat mechanism, and a wire outlet nozzle connected to the end of the wire feeding tube for wire discharging.

[0021] As a further improvement of the present utility model, the distance between the wire outlet nozzle and the anti-retreat mechanism is 100 mm to 300 mm.

[0022] As long as the above-improved technical features do not conflict with each other, they can be combined with each other.

[0023] Generally speaking, compared with the prior art, the beneficial effects of the above technical solutions conceived by the present utility model include:

[0024] (1) The anti-retreat mechanism applicable to the wire feeding device of the present utility model includes a housing and a cover plate, and a receiving cavity for accommodating two anti-retreat units is formed between the two. By using the combined setting of two wire holes on the housing and the pressure wheels, ratchets, ratchet claws, first floating blocks, second floating blocks and corresponding pressing members in the two anti-retreat units, the wire can be accurately fed under the clamping rotation of the two pressure wheels, and the rotation of the ratchet can be accurately locked by the ratchet claw when the two pressure wheels rotate reversely, so as to realize the anti-retreat operation of the wire, ensure the accuracy of wire feeding at the processing part, and improve the precision and quality of laser brazing processing.

[0025] (2) The anti-retreat mechanism applicable to the wire feeding device of the present utility model effectively ensures the reliability of the setting of the pressing member and the convenience of adjustment by preferably designing the pressing member as a compression spring and correspondingly setting structures such as a pressure adjusting member and a receiving groove, provides conditions for the application of the anti-retreat mechanism in different application scenarios, expands the applicable range of the anti-retreat mechanism, and reduces the setting and use costs of the anti-retreat mechanism.

[0026] (3) The anti-retreat mechanism applicable to the wire feeding device of the present utility model ensures that a gap for the wire to quickly pass through can be accurately formed between the pressure wheels of the two anti-retreat units in the initial state by arranging partition ribs on the housing and / or the cover plate, realizes the wire threading setting of the wire quickly while ensuring the reliable clamping requirement of the wire, and further improves the use flexibility and convenience of the anti-retreat mechanism.

[0027] (4) The wire feeding device of the present utility model greatly shortens the distance between the wire outlet nozzle and the wire clamping and feeding part by arranging the anti-retreat mechanism of the present utility model on the wire feeding tube. By using the setting of the anti-retreat mechanism, the space that the wire can retreat after feeding is effectively reduced, the possible wire retreat when the wire feeding device presses the wire discharged from the wire outlet nozzle against the part to be processed is avoided, the feeding accuracy of the wire at the laser processing part is ensured, and the precision and quality of laser welding are improved.

[0028] (5) The anti-retreat mechanism applicable to the wire feeding device in the present utility model has a compact structure, is convenient to set up and use, can effectively avoid the retreat of the welding wire while ensuring the accurate feeding of the welding wire, thereby improving the accuracy of the welding wire feeding at the welding part to be welded, and improving the quality and precision of laser brazing, and has good practical value. Description of the Drawings

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the drawings required to be used in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0030] Figure 1 It is a schematic diagram of the internal composition of the anti-retreat mechanism applicable to the wire feeding device in the embodiment of the present utility model;

[0031] Figure 2 It is a sectional view of the anti-retreat mechanism applicable to the wire feeding device in the embodiment of the present utility model;

[0032] Figure 3 It is a schematic diagram of the setting form of the pressure wheel assembly and the ratchet assembly of the anti-retreat mechanism in the embodiment of the present utility model;

[0033] Figure 4 It is a schematic diagram of the setting of the pressure wheel assembly of the anti-retreat mechanism on the rotating shaft in the embodiment of the present utility model;

[0034] Figure 5 It is a partial sectional view of the pressure wheel assembly of the anti-retreat mechanism in the embodiment of the present utility model;

[0035] Figure 6 It is a schematic diagram of the structure of the wire feeding device with an anti-retreat mechanism in the embodiment of the present utility model;

[0036] In all the drawings, the same reference numerals represent the same technical features, specifically:

[0037] 100, anti-retreat mechanism; 200, wire feeding pipe; 300, wire outlet nozzle; 400, welding wire;

[0038] 1, housing; 101, accommodation cavity; 102, first connector; 103, second connector; 104, welding wire hole; 105, partition rib; 2, cover plate; 3, pressure wheel; 4, ratchet; 5, ratchet pawl; 6, first rotating shaft; 601, flat key; 602, circlip; 7, second rotating shaft; 8, first floating block; 9, second floating block; 10, bearing; 11, first pressing member; 12, second pressing member; 13, pressure adjusting member. Detailed Embodiments

[0039] In order to make the objectives, technical solutions and advantages of the present utility model more clear and understandable, the present utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model. In addition, the technical features involved in the various embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0040] In the description of the present utility model, it should be understood that unless otherwise clearly specified and defined, the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present utility model.

[0041] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present utility model, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0042] In the present utility model, unless otherwise clearly specified and defined, the terms "install", "connect", "join", "fix", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0043] In the present utility model, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0044] Embodiment:

[0045] Please refer to Figures 1 to 5 , in a preferred embodiment of the present utility model, the anti-backlash mechanism 100 applicable to a wire feeding device includes a housing 1 with an opening on one side and a cover plate 2 provided corresponding to the opening of the housing 1. The cover plate 2 is detachably connected to the opening of the housing 1, and an accommodation cavity 101 for accommodating various components of the anti-backlash mechanism 100 is formed therebetween.

[0046] Specifically, the components arranged in the accommodation cavity 101 in the preferred embodiment include paired anti-backlash units, such as Figure 1 shown, the two anti-backlash units are symmetrically arranged up and down in the accommodation cavity 101.

[0047] Correspondingly, wire holes 104 penetrating the accommodation cavity 101 are coaxially opened at positions on both sides of the housing 1 corresponding to between the two anti-backlash units. One of the two wire holes 104 is an inlet for the wire, and the other is an outlet for the wire. The former is used to thread the wire 400 into the anti-backlash mechanism 100, and the latter is used to lead the wire 400 out of the anti-backlash mechanism 100.

[0048] In actual setting, the two anti-backlash units are respectively arranged on both sides of the axis of the wire hole 104, that is, Figure 1 shown in the upper and lower sides, and the two anti-backlash units are further preferably symmetrically arranged with respect to the axis of the wire hole 104.

[0049] Furthermore, both of the two anti-backlash units in the preferred embodiment include a first rotating shaft 6 and a pressure wheel 3 and a ratchet 4 coaxially arranged on the outer periphery of the first rotating shaft 6. The pressure wheel 3 and the ratchet 4 can rotate synchronously around the shaft, and a ratchet pawl 5 is arranged on one side of the first rotating shaft 6 corresponding to the ratchet 4.

[0050] More specifically, the pressure wheels 3 of the two anti-backlash units are arranged opposite to each other in the accommodation cavity 101, so that the wire 400 can be clamped by the two pressure wheels 3 to complete continuous wire feeding. Corresponding to the arrangement of the two pressure wheels 3, floating blocks, namely a first floating block 8 and a second floating block 9, are respectively arranged at both axial ends of the first rotating shaft 6 in the preferred embodiment, and both ends of the first rotating shaft 6 are rotatably connected to the two floating blocks.

[0051] In actual setting, both ends of the first rotating shaft 6 are respectively rotatably arranged with two floating blocks through bearings 10, and the pressing wheel 3 and the ratchet wheel 4 can rotate synchronously with the first rotating shaft 6.

[0052] Meanwhile, in the preferred embodiment, the ratchet pawl 5 is preferably rotatably connected to the first floating block 8 through the second rotating shaft 7, and it can rotate around the second rotating shaft 7, and it is ensured that the ratchet pawl 5 does not hinder the corresponding ratchet wheel 4 from rotating when the welding wire 400 is fed, and locks the ratchet wheel 4 when the welding wire 400 retracts.

[0053] It can be understood that when the anti-retreat mechanism 100 works, the pressing wheel 3 can only rotate unidirectionally under the restriction of the ratchet wheel 4. When the ratchet wheel 4 rotates along the expected feeding direction, the ratchet pawl 5 continuously opens to allow the ratchet wheel 4 to pass through. At this time, the welding wire 400 and the pressing wheel 3 are in rolling friction, and the frictional force is small, and the welding wire 400 is continuously clamped and fed; when the ratchet wheel 4 rotates reversely, the ratchet pawl 5 catches the ratchet wheel 4, making the ratchet wheel 4 unable to rotate, and then forcing the pressing wheel 3 to also unable to rotate. At this time, the welding wire 400 clamped between the two pressing wheels 3 cannot retract due to the contact frictional force with the surfaces of the two pressing wheels 3, thus effectively avoiding the retraction of the welding wire 400.

[0054] Furthermore, in order to ensure the accuracy of the setting and operation of the two pressing wheels 3, first pressing members 11 are respectively arranged corresponding to the two floating blocks on the sides of the two anti-retreat units facing away from each other, for continuously applying an inward acting force to the two anti-retreat units, so that the two pressing wheels 3 can clamp the welding wire 400 in the radial direction when the welding wire 400 is fed.

[0055] Correspondingly, second pressing members 12 are also respectively arranged on the two sides of the two ratchet pawls 5 facing away from each other, for respectively applying acting forces to the two ratchet pawls 5, and making the ends of the two ratchet pawls 5 always contact the outer circumference of the corresponding ratchet wheel 4.

[0056] Preferably, in actual setting, the first pressing member 11 and / or the second pressing member 12 is a compression spring, as Figure 1 shown. Meanwhile, corresponding to the setting of the compression spring between the housing 1 and the corresponding floating block, it is also preferably provided with a through hole on the outer circumference of the housing 1, and a pressure adjusting member 13 is correspondingly arranged. One end of the pressure adjusting member 13 acts on the end of the compression spring, for adjusting the pressure of the compression spring by changing the compression amount of the compression spring.

[0057] In specific setting, the pressure adjusting member 13 is an adjusting screw threadedly connected to the through hole on the housing 1, and its end abuts against the end of the compression spring. By changing the depth of the adjusting screw screwed in, the compression amount of the compression spring and the magnitude of the pressure action can be changed.

[0058] To further ensure the reliability of the compression spring setting, it is preferred to provide a receiving groove on the surface of the floating block so that one end of the compression spring can be just embedded in the receiving groove, as Figure 3 shown. Similarly, for the end setting of the second pressing member 12, it is also preferred to provide a receiving groove on the surface of the ratchet pawl 5, which will not be elaborated here.

[0059] Preferably, during actual setting, partition ribs 105 are prominently provided on the inner bottom surface of the housing 1 facing the cover plate 2 and / or on the end surface of the cover plate 2 facing the housing 1, and they are in a long strip structure parallel to the end surface of the floating block.

[0060] With the setting of the partition ribs 105, a certain distance (the thickness of the partition ribs 105) is always maintained between the two sets of floating blocks (two first floating blocks 8 and two second floating blocks 9), thereby ensuring that there is always a gap with a certain width between the two pressure wheels 3, facilitating the passing of the welding wire 400.

[0061] It can be understood that in order to ensure that the two pressure wheels 3 can accurately hold the welding wire 400, when the floating blocks on both sides of the partition ribs 105 are pressed against the partition ribs 105, the width of the gap between the two pressure wheels 3 is not greater than the outer diameter of the welding wire 400.

[0062] In a preferred embodiment, the width of the gap between the two pressure wheels 3 is equal to the end face distance between the two sets of floating blocks, that is, by setting the width of the partition ribs 105, the minimum outer diameter of the welding wire 400 applicable to the anti-back mechanism 100 can be determined.

[0063] More specifically, corresponding to the setting of the anti-back mechanism 100, connectors are respectively provided on both sides of the outer periphery of the housing 1 corresponding to the two welding wire holes 104, that is, as Figure 2 shown by the first connector 102 and the second connector 103, for the connection setting of the anti-back mechanism 100 on the wire feeding tube 200.

[0064] During actual setting, the connection between the two connectors and the wire feeding tube 200 is preferably achieved through threaded connection. At this time, connection threads are preferably provided on the outer periphery and / or inner periphery of the two connectors.

[0065] Furthermore, in order to improve the accuracy of the pressure wheel 3 in feeding the welding wire 400 and in stopping the backward movement of the welding wire 400, a knurled pattern is preferably provided along the circumferential direction on the outer periphery of the pressure wheel 3 to sequentially increase the sliding friction force between the welding wire 400 and the pressure wheel 3.

[0066] During actual setting, considering that the pressure wheel 3 needs to continuously contact the welding wire 400 and it is a consumable part with a need for regular replacement, the pressure wheel 3 and the ratchet 4 in the preferred embodiment are respectively independently provided and can be fixed after being sequentially sleeved on the outer periphery of the first rotating shaft 6, so that the first rotating shaft 6, the pressure wheel 3, and the ratchet 4 form a synchronous rotating body structure.

[0067] More specifically, in order to quickly set the pressing wheel 3 and the ratchet wheel 4 on the first rotating shaft 6, preferably, a plurality of flat keys 601 are protrudingly provided on the first rotating shaft 6.

[0068] More preferably, a limiting protrusion is provided on the outer periphery of one end of the first rotating shaft 6 for axially limiting the ratchet wheel 4 or the pressing wheel 3; correspondingly, a snap ring 602 is provided at the other end of the first rotating shaft 6 to achieve axial locking of the corresponding wheel body, as Figure 5 shown in.

[0069] Of course, according to the actual setting requirements, the pressing wheel 3 and the ratchet wheel 4 can also be preferably integrally formed cylindrical structures, that is, it can be considered that the two are processed on the outer periphery of the same cylindrical structure, and the aforementioned cylindrical structure can be fixed with a plurality of flat keys 601 after being sleeved on the outer periphery of the first rotating shaft 6.

[0070] Through the above settings, a reverse prevention mechanism 100 applicable to the wire feeding device can be obtained. By using the synchronous movement of the pressing wheel 3 and the ratchet wheel 4, accurate feeding of the welding wire 400 is completed; and then by using the mutual cooperation between the ratchet pawl 5 and the ratchet wheel 4, locking during the reverse rotation of the pressing wheel 3 can be accurately achieved. Through the frictional contact force between the welding wire 400 and the two pressing wheels 3, the backward movement of the welding wire 400 during feeding and use can be effectively prevented, thereby ensuring the accuracy and quality of laser brazing.

[0071] As another aspect of the present invention, on the basis of the aforementioned reverse prevention mechanism 100, a wire feeding device is further provided. By arranging the reverse prevention mechanism 100 on the wire feeding tube 200, while accurately realizing the wire feeding of the welding wire 400, the backward movement of the welding wire 400 can be avoided.

[0072] In actual setting, the wire feeding device includes a reverse prevention mechanism 100, a wire feeding tube 200, and a wire outlet nozzle 300. Among them, the reverse prevention mechanism 100 is arranged in the middle of the wire feeding tube 200, that is, the wire feeding tube 200 is arranged at both ends of the reverse prevention mechanism 100. At the same time, the wire feeding tube 200 is coaxially communicated with two wire holes 104 on the housing 1 of the reverse prevention mechanism 100.

[0073] In a preferred embodiment, both ends of the housing 1 are threadedly connected to the ends of the wire feeding tube 200 with connectors. Correspondingly, a wire outlet nozzle 300 is provided at the end of the wire feeding tube 200 for the outlet of the welding wire 400 to feed the welding wire 400 transmitted by the wire feeding device to the part to be processed.

[0074] In a preferred embodiment, the distance between the wire outlet nozzle 300 and the reverse prevention mechanism 100 is preferably 100 mm to 300 mm.

[0075] By setting the anti-retreat mechanism 100, the distance between the wire outlet nozzle 300 and the wire clamping and feeding part of the welding wire 400 is greatly reduced from more than 1 m in the conventional situation to 0.1 - 0.3 m, significantly reducing the retreat space of the welding wire 400, thereby ensuring the accuracy of the welding wire 400 feeding at the part to be welded.

[0076] The anti-retreat mechanism applicable to the wire feeding device in the present utility model has a compact structure, is convenient to set and use, can effectively avoid the retreat of the welding wire while ensuring the accurate feeding of the welding wire, thereby improving the accuracy of the welding wire feeding at the part to be welded, and improving the quality and precision of laser brazing, having good practical value.

[0077] It is easy for those skilled in the art to understand that the above are only the preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A backstop mechanism applicable to a wire feeding device, characterized in that, It includes a cover plate and a housing with an opening on one side; the cover plate is detachably connected to the opening of the housing, and an accommodation cavity is formed therebetween; On both sides of the housing, wire holes penetrating the accommodation cavity are coaxially provided, and anti-retreat units are arranged in pairs in the accommodation cavity, and the two anti-retreat units are respectively arranged on both sides of the axis of the wire hole; The anti-retreat unit includes a pressure wheel and a ratchet wheel that are coaxially arranged on the outer periphery of the first rotating shaft and can rotate synchronously, and a ratchet pawl is rotatably connected to one side of the ratchet wheel through a second rotating shaft; the pressure wheels of the two anti-retreat units are arranged opposite to each other, so that the welding wire can be clamped by the two pressure wheels and continuously fed; the ratchet pawl does not hinder the rotation of the corresponding ratchet wheel during the feeding of the welding wire, and locks the ratchet wheel when the welding wire retreats; and The anti-retreat unit further includes a first floating block and a second floating block respectively arranged at both ends of the first rotating shaft, and both ends of the first rotating shaft are rotatably connected to the two floating blocks; and first pressing members are respectively arranged on the sides of the two anti-retreat units facing away from each other corresponding to the two floating blocks, for applying an inward acting force to the two anti-retreat units, so that the two pressure wheels can radially press the welding wire during the feeding of the welding wire.

2. The anti-reverse mechanism applicable to the wire feeding device according to claim 1, characterized in that, Second pressing members are respectively arranged on both sides of the two ratchet pawls facing away from each other, for applying acting forces to the two ratchet pawls respectively and making the ends of the two ratchet pawls always contact the outer periphery of the corresponding ratchet wheel.

3. The anti-reverse mechanism applicable to the wire feeding device according to claim 2, characterized in that, The first pressing member and / or the second pressing member is a compression spring, and a pressure adjusting member is arranged on the outer peripheral wall surface of the housing corresponding to the compression spring; one end of the pressure adjusting member acts on the end of the compression spring, for adjusting the pressure of the compression spring by changing the compression amount of the compression spring.

4. The anti-back-off mechanism applicable to a wire feeding device according to any one of claims 1 to 3, characterized in that, Both ends of the first rotating shaft are respectively rotatably connected to the corresponding floating blocks through bearings; and / or, The ratchet pawl is rotatably connected to the first floating block through a second rotating shaft.

5. The anti-backlash mechanism applicable to the wire feeding device according to any one of claims 1 to 3, characterized in that, On the bottom surface of the housing facing the cover plate and / or on the end surface of the cover plate facing the housing, strip-shaped partition ribs parallel to the end surface of the floating block are prominently arranged, so that when the end surfaces of the corresponding floating blocks of the two anti-retreat units abut against both sides of the partition ribs, a gap with a width not greater than the outer diameter of the welding wire is formed between the two pressure wheels.

6. The anti-back-off mechanism applicable to the wire feeding device according to any one of claims 1 to 3, characterized in that Connectors are respectively arranged on both sides of the outer periphery of the housing corresponding to the two wire holes, for the connection and installation of the anti-retreat mechanism on the wire feeding pipe.

7. The anti-backstepping mechanism applicable to a wire feeding device according to any one of claims 1 to 3, characterized in that, The outer periphery of the pressure wheel is provided with a circumferentially arranged knurled pattern.

8. The anti-retreat mechanism applicable to the wire feeding device according to any one of claims 1 to 3, characterized in that, The pressure wheel and the ratchet wheel are respectively sleeved on the outer periphery of the first rotating shaft and fixed with flat keys to form a synchronous rotating body structure.

9. A wire feeding device, characterized in that, It includes an anti-retreat mechanism for a wire feeding device according to any one of claims 1 to 8; and The wire feeding device further includes wire feeding pipes respectively arranged at both ends of the anti-retreat mechanism and coaxially connected to the anti-retreat mechanism, and a wire outlet nozzle connected to the end of the wire feeding pipe for wire discharging.

10. The wire feeding device according to claim 9, characterized in that, The distance between the wire outlet nozzle and the anti-retreat mechanism is 100 mm to 300 mm.

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