Cladding head and cladding device for small-bore valve cladding

Abstract

The application discloses a cladding head and a cladding device for small-bore valve cladding, and relates to the technical field of welding, which comprises a body, the body comprises an ion gas pipe, a cooling water pipe, a powder feeding pipe and an outer protective pipe from inside to outside in sequence, and a tungsten electrode is arranged in the ion gas pipe; a vertical part and a necking part are formed on the powder feeding pipe, the necking part is located on the lower side of the vertical part, a cutting piece is arranged at the communication part of the vertical part and the necking part, a plurality of through holes for powder passing through are formed on the cutting piece, and a vibration assembly for driving the cutting piece to vibrate is arranged at the vertical part. The application helps to solve the powder clumping phenomenon in the pipe.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of welding, in particular to a cladding head and cladding device for small-bore valve cladding. BACKGROUND

[0002] At present, when cladding is performed on a small-bore valve, a cladding head as mentioned in the publication CN112045290A is usually used. In the actual welding process, because the powder feeding pipe is adjacent to the cooling pipe, the humidity in the powder feeding pipe is relatively high under the action of the cooling pipe, thereby causing the powder to form clumps.

[0003] The powder clumps will cause the powder to not uniformly participate in the welding reaction in the welding process, and the inside of the powder clumps can be wrapped with air or other gas. When the welding arc acts on the clumped powder, the gas is released to form pores in the weld. The existence of the pores will weaken the effective cross-sectional area of the weld, reduce the strength and density of the weld, and make the welded joint prone to damage under stress. SUMMARY

[0004] In order to solve the problem of powder clumping, the present application provides a cladding head and cladding device for small-bore valve cladding.

[0005] The cladding head and cladding device for small-bore valve cladding provided by the present application adopt the following technical solutions:

[0006] A cladding head for small-bore valve cladding, comprising a body, the body sequentially comprises an ion gas pipe, a cooling water pipe, a powder feeding pipe and an outer protective pipe from inside to outside, a tungsten electrode is arranged in the ion gas pipe; a vertical portion and a necked portion are formed on the powder feeding pipe, the necked portion is located on the lower side of the vertical portion, a cutting piece is arranged at the communication part of the vertical portion and the necked portion, a plurality of through holes for powder to pass through are formed on the cutting piece, and a vibration assembly for driving the cutting piece to vibrate is arranged at the vertical portion.

[0007] By adopting the above technical solutions, when the powder enters the powder feeding pipe, the powder will be cut by the cutting piece, thereby dispersing the clumped powder, and the vibration assembly synchronously drives the cutting piece to vibrate, improving the cutting effect, and the vibration is transmitted to the clumped powder falling on the cutting piece, thereby further improving the effect of powder dispersion.

[0008] Preferably, the cutting piece comprises a base plate, a first cutting plate and a second cutting plate, the base plate is fixedly installed in the powder feeding pipe, the first cutting plate is annularly distributed in the powder feeding pipe, and the second cutting plate is distributed along the radial direction of the powder feeding pipe, a plurality of first cutting plates and a plurality of second cutting plates are arranged, and all the first cutting plates and all the second cutting plates are distributed in a grid shape.

[0009] By adopting the technical scheme, when the agglomerated powder falls on the cutting plate, the agglomerated powder cannot pass through the net structure formed by the cutting plates, and the agglomerated powder will collide with the cutting plate under the action of the gas conveying force, thereby achieving the effect of cutting and scattering the agglomerated powder.

[0010] Preferably, the cutting member comprises a base plate and a plurality of cutting lines, and all the cutting lines are distributed in a grid shape on the base plate.

[0011] By adopting the technical scheme, when the agglomerated powder impacts on the cutting line, the agglomerated powder will be cut and scattered by the cutting line, and the agglomerated powder will rebound after impacting on the cutting line due to the elasticity of the cutting line, so that the agglomerated powder can be further impacted and scattered by the elastic force, thereby improving the scattering effect on the powder; and in the process of conveying the powder by the gas, the gas impacting on the plurality of cutting lines will also drive the cutting lines to vibrate reciprocatingly, thereby further improving the vibration effect of the cutting lines and improving the scattering effect on the powder.

[0012] Preferably, the receiving groove for mounting the base plate is arranged on the opposite inner wall of the vertical portion of the powder conveying pipe; the vibration assembly comprises a striking block and a driving member for driving the striking block to slide, the inner wall of the vertical portion is further provided with a sliding groove in communication with the receiving groove, the striking block slides in the sliding groove, and the striking block reciprocatingly strikes the base plate.

[0013] By adopting the technical scheme, in the process of conveying the powder, the driving member drives the striking block to reciprocatingly strike the base plate, so that the base plate vibrates, thereby improving the vibration degree of the cutting plate or the cutting line on the base plate and improving the scattering effect on the agglomerated powder.

[0014] Preferably, the driving member is a wind wheel, the inner wall of the powder conveying pipe is rotationally connected with a rotating shaft, the rotating shaft is located on the side close to the cooling pipe, the wind wheel is coaxially fixed on the rotating shaft, a dynamic push plate is fixedly arranged on the rotating shaft, a static push plate is arranged on the upper side of the striking block, when the dynamic push plate rotates, the dynamic push plate pushes the static push plate to move the striking block away from the base plate; the inner wall of the powder conveying pipe located in the sliding groove is further provided with a sliding groove, the side edge of the striking block is provided with a sliding block in sliding cooperation with the sliding groove, the powder conveying pipe located in the sliding groove is provided with a reset spring, the reset spring is located on the upper side of the sliding block, one end of the reset spring is connected with the inner wall of the sliding groove, and the other end of the reset spring is connected with the sliding block.

[0015] By adopting the above technical scheme, the powder feeding mode in the powder feeding pipe adopts the air pressure powder feeding mode, so that the wind force exists in the powder feeding pipe. In the powder feeding process, the wind force acts on the wind wheel to drive the wind wheel to rotate, the wind wheel drives the rotating shaft to rotate, the dynamic shifting plate drives the static shifting plate to move when the rotating shaft rotates, that is, the dynamic shifting plate drives the impact block to move away from the base plate. After the dynamic shifting plate and the static shifting plate are separated, the impact block quickly slips to the base plate under the action of the reset spring, and then the impact block collides with the base plate, thereby improving the vibration degree of the cutting plate or the cutting wire.

[0016] Preferably, the side edge of the impact block is provided with a mounting port, and the impact block is hinged with a friction block through a torsional spring in the mounting port. In the initial state, the friction block is inclined towards the side close to the base plate. The lower side of the impact block in the mounting port is provided with an avoidance slot for avoiding the friction block. The upper and lower sides of the powder feeding pipe in the sliding groove are both formed with avoidance ports, and the upper avoidance port of the powder feeding pipe is formed with an abutting surface. When the impact block slips away from the base plate, the friction block is accommodated into the avoidance slot under the action of the lower avoidance port. When the impact block slips towards the base plate, the friction block is gradually rotated and inclined upwards under the action of the abutting surface. Finally, the end of the friction block abuts against the inner wall of the sliding groove to slip. The friction between the friction block and the inner wall of the sliding groove generates heat, and the heat is conducted to the powder feeding pipe to reduce the humidity in the pipe.

[0017] By adopting the above technical scheme, when the wind wheel rotates to drive the impact block to move upwards, the friction block is accommodated in the avoidance slot at this time, that is, the friction between the end of the friction block and the inner wall of the sliding groove is small, so that the passive shifting plate can easily drive the friction block. The friction between the friction block and the sliding groove is prevented from being large, so that the wind wheel cannot rotate. After the dynamic shifting plate and the static shifting plate are separated, the impact block moves downwards under the action of the reset spring. At this time, the inclination state of the friction block changes under the action of the abutting surface. The friction block is inclined upwards and abuts against the inner wall of the sliding groove. The friction block maintains the abutting state with the sliding groove. The impact block gradually slips downwards and collides with the base plate. In this process, because of the abutting friction between the friction block and the sliding groove, heat is generated between the friction block and the sliding groove during the reciprocating motion. The heat is conducted to the powder feeding pipe to dry the pipe and reduce the humidity in the pipe, thereby avoiding powder agglomeration.

[0018] Preferably, the inner wall of the powder feeding pipe in the sliding groove is provided with a knocking groove at intervals. When the friction block moves into the knocking groove, the friction block is rotated and knocks the port of the knocking groove under the action of the torsional spring.

[0019] By adopting the above technical scheme, when the friction block moves to the knocking groove, the friction block is rotated and knocks the port of the knocking groove under the action of the torsional spring, so that the inner wall of the powder feeding pipe vibrates to make the powder attached to the inner wall of the powder feeding pipe fall off. At the same time, the setting of the knocking groove reduces the wall thickness and helps to improve the heat conduction effect.

[0020] A cladding device for cladding of small-bore valve, comprising the cladding head.

[0021] In summary, the present application includes at least one of the following beneficial technical effects:

[0022] 1. When there are agglomerated powders in the powder feeding pipe, the cutting member disperses the powders, and the vibration assembly drives the cutting member to vibrate, which helps to improve the cutting effect of the cutting member, and after the vibration is transmitted to the agglomerated powders, the dispersing effect on the powders is improved;

[0023] 2. With the help of the wind wheel, under the action of the airflow, the wind wheel rotates to drive the dynamic shifting plate to rotate, and the dynamic shifting plate intermittently drives the static shifting plate to slide, that is, the reciprocating sliding of the impact block is realized, the impact block reciprocatingly impacts on the base plate to drive the base plate to vibrate, so that the cutting line or the cutting plate vibrates, and the dispersing effect on the powders is improved;

[0024] 3. In the reciprocating sliding process of the impact block, the friction block on the impact block will generate heat by friction with the inner wall of the sliding groove, and the heat will gradually conduct to the powder feeding pipe, so that the pipe is dried, and then the agglomeration phenomenon of the powders is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a whole structure sectional view of the embodiment one of the present application;

[0026] Figure 2 It is a structure schematic view of the cutting member in the embodiment one of the present application;

[0027] Figure 3 It is Figure 1 It is a local enlarged view of A in the embodiment one of the present application, mainly showing the structure of the vibration assembly;

[0028] Figure 4 It is a partial structure schematic view of the embodiment one of the present application, mainly showing the structure of the friction block;

[0029] Figure 5 It is a structure schematic view of the cutting member in the embodiment two of the present application;

[0030] Figure 6 In the embodiment three of the present application, the structure schematic view of the knocking groove is mainly shown.

[0031] : 1, body; 2, ion gas pipe; 21, tungsten electrode; 3, cooling water pipe; 4, powder feeding pipe; 41, vertical part; 42, necking part; 5, outer protective pipe; 6, cutting piece; 61, base plate; 62, first cutting plate; 63, second cutting plate; 64, cutting line; 7, vibration assembly; 71, impact block; 711, static push plate; 712, sliding block; 72, wind wheel; 8, containing groove; 9, sliding groove; 91, sliding groove; 92, reset spring; 93, avoiding opening; 931, abutting surface; 94, knocking groove; 10, rotating shaft; 101, dynamic push plate; 20, mounting opening; 201, avoiding groove; 30, friction block. DETAILED DESCRIPTION

[0032] The following description will be made in conjunction with the accompanying drawings. Figure 1 - the accompanying drawings Figure 6 The application is further described in detail.

[0033] The embodiment of the application discloses a cladding head for small-bore valve cladding.

[0034] Embodiment 1

[0035] Referring to Figure 1 , the cladding head for small-bore valve cladding comprises a body 1, the body 1 is a multilayer sleeve, the body 1 comprises an ion gas pipe 2, a cooling water pipe 3, a powder feeding pipe 4 and an outer protective pipe 5 from inside to outside in sequence, the ion gas pipe 2 is internally provided with a tungsten electrode 21, the powder feeding pipe 4 is formed with a vertical part 41 and a necking part 42, the powder is sprayed from the necking part 42 and reacts with a plasma arc generated at the lower end of the ion gas pipe 2, so that the welding operation on the base body is realized, and the outer protective pipe is internally passed through with protective gas.

[0036] The communication part of the vertical part 41 and the necking part 42 is provided with a cutting piece 6, and the inner wall of the vertical part 41 is provided with a vibration assembly 7 for driving the cutting piece 6 to vibrate.

[0037] When the powder enters the powder feeding pipe 4, the powder meets the cutting piece 6 and is cut by the cutting piece 6, and this process can effectively scatter the agglomerated powder. At the same time, the vibration assembly 7 drives the cutting piece 6 to vibrate, which on the one hand enhances the cutting efficiency of the cutting piece 6, and on the other hand, the vibration is conducted to the agglomerated powder on the surface of the cutting piece 6, and the powder agglomerates are further broken by high-frequency vibration, so that the scattering effect of the powder is significantly improved.

[0038] Referring to Figure 1 , Figure 2 and Figure 3The cutting member 6 comprises a base plate 61, a first cutting plate 62 and a second cutting plate 63. The base plate 61 is provided with two rings. The inner wall and the outer wall of the powder feeding pipe 4 are provided with accommodating grooves 8. The two base plates 61 are inserted into the two accommodating grooves 8. The first cutting plate 62 and the second cutting plate 63 are provided with a plurality of plates. The second cutting plate 63 is distributed along the radial direction of the powder feeding pipe 4 and is fixedly connected with the two base plates 61. The first cutting plate 62 is fixedly connected with all the second cutting plates 63. The first cutting plate 62 penetrates all the second cutting plates 63. That is, all the first cutting plates 62 and the second cutting plates 63 are distributed in a grid shape. The circumferential side of the intersection of the first cutting plate 62 and the second cutting plate 63 is provided with a through hole for the powder to pass through.

[0039] When the agglomerated powder contacts the cutting plate, it cannot pass directly due to the grid structure. At this time, under the action of the thrust generated by the gas conveying, the agglomerated powder will impact the cutting plate with a certain force. The impact force and the blocking effect of the cutting plate cooperate with each other to promote the cutting and scattering of the agglomerated powder, thereby achieving the purpose of powder dispersion.

[0040] The vibration assembly 7 comprises an impact block 71 and a driving member for driving the impact block 71 to slide. The inner wall of the vertical portion 41 close to the cooling pipe is provided with a sliding groove 9, which is communicated with the accommodating groove 8. The impact block 71 is slidably connected with the sliding groove 9. The driving member drives the impact block 71 to reciprocally impact the base plate 61.

[0041] During the powder conveying operation, the driving member continuously drives the impact block 71 to make reciprocating motion, so that the impact block 71 repeatedly impacts the base plate 61. The force generated by the impact promotes the high-frequency vibration of the base plate 61. The vibration is effectively transmitted to the cutting plate on the base plate 61. After the vibration amplitude and frequency of the cutting plate are significantly improved, the cutting plate can more effectively act on the agglomerated powder. Through continuous impact and tearing, the dispersion efficiency of the agglomerated powder is further enhanced, and the uniformity and smoothness of the powder conveying are ensured.

[0042] The driving member is a wind wheel 72. The inner wall of the vertical portion 41 close to the cooling pipe is rotatably connected with a rotating shaft 10. The wind wheel 72 is coaxially fixed on the rotating shaft 10. A dynamic plate 101 is fixedly connected with the rotating shaft 10. A static plate 711 is fixedly connected with the side of the impact block 71 away from the base plate 61. When the rotating shaft 10 rotates, the dynamic plate 101 can intermittently drive the static plate 711, that is, drive the impact block 71 to slide away from the base plate 61. The inner wall of the vertical portion 41 located in the sliding groove 9 is provided with a sliding groove 91. The side of the impact block 71 is integrally formed with a sliding block 712 which slidably connects with the sliding groove 91. The sliding groove 91 is provided with a reset spring 92. The reset spring 92 is located on the upper side of the sliding block 712. One end of the reset spring 92 is connected with the inner wall of the sliding groove 91. The other end of the reset spring 92 is connected with the sliding block 712.

[0043] The powder feeding pipe 4 uses air pressure to feed powder, and airflow power continuously exists in the pipe. During the powder feeding process, the wind power acts on the wind wheel 72 to drive the wind wheel 72 to continuously rotate. The wind wheel 72 drives the rotating shaft 10 to rotate, and when the rotating shaft 10 rotates, the movable push plate 101 on the rotating shaft 10 rotates, pushes the movable push plate 101 to move, and then drives the impact block 71 connected with the movable push plate 101 to move away from the base plate 61. When the movable push plate 101 and the movable push plate 711 are separated from each other, the reset spring 92 releases the elastic potential energy, so that the impact block 71 rapidly slides to the base plate 61, and impacts the surface of the base plate 61 with a large impact force. The periodic impact makes the base plate 61 vibrate at a high frequency, and transmits the vibration energy to the cutting plate, significantly improves the vibration amplitude of the cutting plate, and enhances the dispersion effect of the agglomerated powder.

[0044] With reference to Figure 1 , Figure 3 and Figure 4 , the side edge of the impact block 71 is provided with a mounting port 20, and the impact block 71 is located in the mounting port 20 and is hinged with a friction block 30 through a torsion spring. In the initial state, the friction block 30 is inclined to the side close to the base plate 61. The lower side of the impact block 71 located in the mounting port 20 is provided with an avoidance slot 201 for avoiding the rotation of the friction block 30. The vertical part 41 is formed with avoidance ports 93 on the upper and lower sides of the sliding slot 9, and the vertical part 41 is formed with an abutting surface 931 at the upper avoidance port 93. When the impact block 71 slides away from the base plate 61, the friction block 30 is received into the avoidance slot 201 under the action of the lower avoidance port 93, and the friction block 30 is turned outward by a certain angle when the friction block 30 moves to the upper avoidance port 93; when the impact block 71 slides to the base plate 61, the friction block 30 is turned upward under the action of the abutting surface 931 and finally abuts against the upper side of the mounting port 20. At this time, the end of the friction block 30 abuts against the inner wall of the sliding slot 9, and there is friction sliding between the friction block 30 and the sliding slot 9 during the sliding of the impact block 71.

[0045] When the wind wheel 72 rotates and drives the impact block 71 to move upward, the friction block 30 will retract into the avoiding groove 201, and the friction force will be significantly reduced, so that the moving plate 101 can easily drive it to move, effectively avoiding the excessive friction force from hindering the rotation of the wind wheel 72. After the moving plate 101 is disengaged from the static plate 711, the reset spring 92 releases the elastic force and pushes the impact block 71 to quickly move downward. In this process, the friction block 30 is acted on by the abutting surface 931, and the inclination angle changes, gradually tilting upward and closely fitting the inner wall of the sliding groove 9. In the state of continuously abutting the sliding groove 9, the impact block 71 continuously slides downward and impacts the base plate 61. Due to the friction between the friction block 30 and the inner wall of the sliding groove 9, heat will be generated during the reciprocating movement of the impact block 71. These heat will gradually conduct to the inside of the powder feeding pipe 4, play a role in drying the pipe, and effectively reduce the humidity in the pipe, thereby reducing the possibility of powder agglomeration from the environmental condition level.

[0046] The implementation principle of the embodiment of the application for the cladding head for small-bore valve cladding is: when the powder enters the powder feeding pipe 4, the agglomerated powder can be broken up under the action of the cutting plate, thereby ensuring the subsequent welding effect; and the reciprocating vibration of the impact block 71 can further improve the breaking-up effect of the powder. In the reciprocating movement of the impact block 71, heat is generated by friction, the humidity in the powder feeding pipe 4 is reduced, and the possibility of powder agglomeration is reduced.

[0047] Embodiment 2

[0048] With reference to Figure 5 The difference between the embodiment and embodiment 1 is that the cutting member 6 includes the base plate 61 and a plurality of cutting lines 64, the cutting lines 64 are provided in a plurality of groups and are distributed in a grid shape between the two base plates 61.

[0049] When the agglomerated powder impacts on the cutting line 64, the cutting line 64 will cut and separate the agglomerated powder by virtue of the sharp cutting edge. Since the cutting line 64 itself has elastic characteristics, when it is impacted by the agglomerated powder, it will quickly deform and rebound. The elastic restoring force will again act on the powder agglomerate, and the powder will be further broken up by the secondary impact. At the same time, in the process of gas pressure powder feeding, the flowing gas continuously impacts the multiple groups of cutting lines 64, causing them to produce high-frequency reciprocating vibration. The dynamic vibration of the cutting line 64 not only expands the contact range with the agglomerated powder, but also significantly improves the efficiency and effect of powder breaking-up through continuous collision and tearing action.

[0050] Embodiment 3

[0051] With reference to Figure 6 The difference between the embodiment and embodiment 1 is that the vertical part 41 is provided on the inner wall of the sliding groove 9 and is spaced apart to form a knocking groove 94. When the module moves into the knocking groove 94, the friction block 30 rotates and knocks the notch of the knocking groove 94 under the action of the torsional spring.

[0052] When the friction block 30 moves to the position of the knocking groove 94, the friction block 30 is rapidly rotated and hits the port of the knocking groove 94 under the elastic torque driving of the torsion spring. The knocking action causes the vibration of the inner wall of the powder pipe 4, and the powder attached to the wall is caused to fall off due to the vibration. In addition, the presence of the knocking groove 94 makes the wall of this part thin, reduces the resistance of heat transfer, and significantly enhances the conduction efficiency of heat from the friction area to the inside of the powder pipe 4, further improving the drying effect inside the pipe.

[0053] The application also discloses a cladding device for small-bore valve cladding, which comprises the cladding head in any of the above embodiments.

[0054] The above are preferred embodiments of the application, which do not limit the protection scope of the application, and thus: any equivalent changes made on the structure, shape and principle of the application should be covered within the protection scope of the application.

Claims

1. A build-up head for cladding build-up welding of small-bore valves, characterized in that: The utility model provides an ion gun, which comprises a body (1), the body (1) comprises ion gas pipe (2), cooling water pipe (3), powder feeding pipe (4) and outer protective pipe (5) from inside to outside in proper order, the tungsten electrode (21) is arranged in the ion gas pipe (2), the vertical portion (41) and the necking portion (42) are formed on the powder feeding pipe (4), the necking portion (42) is located the downside of vertical portion (41), the cuttings (6) are arranged at the communication of vertical portion (41) and necking portion (42), a plurality of through holes for powder passing through are formed on the cuttings (6), the vibration assembly (7) for driving the vibration of cuttings (6) is arranged at vertical portion (41), the cuttings (6) comprise the base plate (61), the accommodating groove (8) for installing the base plate (61) is formed on the opposite inner wall of vertical portion (41), the vibration assembly (7) comprises the impact block (71) and the driving part for driving the sliding of impact block (71), the sliding groove (9) that is communicated with the accommodating groove (8) is also formed on the inner wall of vertical portion (41), the impact block (71) slides in the sliding groove (9), and the impact block (71) reciprocatingly impacts the base plate (61), the driving part is arranged as the wind wheel (72), the rotating shaft (10) is rotatably connected to the inner wall of powder feeding pipe (4), the rotating shaft (10) is located on the side close to the cooling pipe, the wind wheel (72) is coaxially fixed on the rotating shaft (10), the dynamic abutting plate (101) is fixedly arranged on the rotating shaft (10), the static abutting plate (711) is arranged on the upper side of impact block (71), when the dynamic abutting plate (101) rotates, the dynamic abutting plate (101) drives the static abutting plate (711) to make the impact block (71) move away from the base plate (61), the sliding groove (91) is also formed on the inner wall of sliding groove (9), the sliding block (712) that is slidably matched with the sliding groove (91) is arranged on the side of impact block (71), the reset spring (92) is arranged in the sliding groove (91), the reset spring (92) is located on the upper side of sliding block (712), one end of reset spring (92) is connected with the inner wall of sliding groove (91), and the other end of reset spring (92) is connected with sliding block (712), the mounting port (20) is formed on the side of impact block (71), the friction block (30) is hingedly arranged in the mounting port (20) through the torsional spring, in the initial state, the friction block (30) is inclined to the side close to the base plate (61), the avoiding groove (201) for avoiding the friction block (30) is formed on the downside of impact block (71) in the mounting port (20), the avoiding port (93) is formed on the upper side and the lower side of sliding groove (9), and the abutting face (931) is formed on the upper side avoiding port (93) of powder feeding pipe (4).When the impact block (71) slides away from the base plate (61), the friction block (30) is accommodated into the avoidance slot (201) under the action of the lower avoidance opening (93). When the impact block (71) slides towards the base plate (61), the friction block (30) will gradually rotate and tilt upwards under the action of the abutting surface (931). Finally, the end of the friction block (30) will abut the inner wall of the sliding slot (9) and slide. The friction between the friction block (30) and the inner wall of the sliding slot (9) generates heat, which is conducted to the powder feeding pipe (4) to reduce the humidity in the pipe.

2. A head for cladding and overlay welding of small-bore valves according to claim 1, characterized in that: The cutting member (6) further comprises a first cutting plate (62) and a second cutting plate (63), the base plate (61) is fixedly installed in the powder feeding pipe (4), the first cutting plate (62) is annularly distributed in the powder feeding pipe (4), the second cutting plate (63) is distributed along the radial direction of the powder feeding pipe (4), the first cutting plate (62) and the second cutting plate (63) are provided with a plurality of first cutting plates (62) and a plurality of second cutting plates (63), and all the first cutting plates (62) and all the second cutting plates (63) are distributed in a grid shape.

3. The overlaying head for cladding and surfacing small-bore valves according to claim 1, characterized in that: The cutting member (6) further comprises a plurality of cutting lines (64), and all the cutting lines (64) are distributed in a grid shape on the base plate (61).

4. The overlaying head for cladding and surfacing small-bore valves according to claim 1, characterized in that: The powder feeding pipe (4) is provided with a knocking groove (94) on the inner wall of the sliding groove (9) at intervals, when the friction block (30) moves into the knocking groove (94), the friction block (30) will rotate and knock the port of the knocking groove (94) under the action of the torsional spring.

5. A cladding device for cladding small-bore valves, characterized in that: A build-up head as claimed in any one of claims 1 to 4. A build-up head as claimed in any one of claims 1 to 4.

Images