Laser powder feeding cladding lateral powder feeding head capable of rapidly replacing powder feeding pipe

Abstract

The utility model discloses a laser powder feeding cladding lateral powder feeding head capable of quickly replacing a powder feeding pipe, which comprises a powder feeding hose joint, the powder feeding hose joint comprises a powder feeding hose quick-insertion interface, and one end of the powder feeding hose quick-insertion interface is connected with an opening on the top surface of a powder pipe fixing head; the outer wall of the powder tube fixing head is an external thread face, a stepped through hole is formed in the middle of the powder tube fixing head, the upper portion of the powder tube is inserted into the stepped through hole, the powder tube is sleeved with the powder tube protection sleeve, the upper end and the lower end of the powder tube protection sleeve are respectively internal thread holes, and the internal thread holes in the upper end of the powder tube protection sleeve are in threaded connection with external threads of the powder tube fixing head. The inner threaded hole in the lower end of the powder pipe protection sleeve is in threaded connection with the outer threaded hole end of the nozzle, and the lower end of the powder pipe penetrates through the middle through hole of the nozzle. The structure is convenient to replace and low in cost.

Description

Technical Field

[0001] The utility model relates to a laser powder feeding cladding powder feeding head, in particular to a laser powder feeding cladding lateral powder feeding head with a powder feeding tube capable of being quickly replaced. Background Art

[0002] The main function of the powder feeding head used in laser powder cladding technology is to guide the laser cladding powder into the laser molten pool, and it usually also needs to have the function of conveying protective gas.

[0003] Currently, powder feeders are primarily categorized as coaxial and lateral. Coaxial powder feeders are coaxial with the laser beam, resulting in high powder feeding accuracy. However, since the powder feeder is located directly above the molten pool, most of the laser light reflected from the molten pool will be directed onto the powder feeder. This necessitates the design of complex and precise cooling water / air channels, which not only results in high production costs but also results in a larger diameter for axial powder feeders, making them less adaptable to component shapes.

[0004] There is a certain angle between the lateral powder feeding head and the laser beam, and the powder feeding accuracy is slightly lower than that of the coaxial powder feeding head. Its advantage is that it can be set up separately, which can better play the characteristics of laser non-contact processing, and has stronger adaptability to the shape of parts, which is particularly suitable for on-site laser cladding of parts. The lateral powder feeding head is located on one side of the laser molten pool. In theory, it only needs to withstand a part of the laser radiation reflected by the molten pool. However, in the actual working process, due to various reasons such as molten pool stirring and program failure, the lateral powder feeding head is often burned by the laser reflected by the molten pool. The conventional solution is to increase forced cooling of the lateral powder feeding head, such as setting up cooling water channels, but this will cause the diameter of the lateral powder feeding head to increase, increase manufacturing costs, and especially affect its adaptability to the shape of parts. Summary of the Invention

[0005] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a laser powder cladding lateral powder feeding head which can quickly replace the powder feeding tube and is cheap and easy to manufacture.

[0006] The technical solutions to realize this utility model are:

[0007] The utility model discloses a laser powder cladding lateral powder feeding head with a powder feeding tube that can be quickly replaced, comprising a powder feeding hose connector, wherein the powder feeding hose connector comprises a metal disc, a powder feeding hose quick plug interface is connected in the middle of the metal disc, one end of the powder feeding hose quick plug interface is connected to the powder feeding hose, the outlet end of the powder feeding hose quick plug interface passes through the bottom surface of the metal disc and is inserted into the top surface opening of the powder tube fixing head, and the bottom surface of the metal disc where the outlet end is located and the top surface opening of the powder tube fixing head are sealed and fixedly connected; the outer wall of the powder tube fixing head is an external threaded surface, a stepped through hole is opened in the middle of the powder tube fixing head, the bottom of the top surface opening constituting the stepped through hole and the top of the lower opening constituting the stepped through hole are connected by a reduced diameter hole, and the lower opening is a straight hole and the diameter is larger than the diameter of the reduced diameter hole;

[0008] The upper part of the powder tube is inserted into the straight hole of the powder tube fixing head and the top end of the powder tube is pressed against the shoulder of the hole where the reduced diameter hole and the straight hole are connected. The powder tube and the straight hole are clearance-matched. A powder tube protective sleeve is provided on the outer sleeve of the powder tube. The upper and lower ends of the powder tube protective sleeve are respectively internal threaded holes. The internal threaded hole at the upper end of the powder tube protective sleeve is threadedly connected with the external thread of the powder tube fixing head. The internal threaded hole at the lower end of the powder tube protective sleeve is threadedly connected with the external threaded hole end of the nozzle. The lower end of the powder tube is arranged through the middle through hole of the nozzle, and the lower end of the powder tube is clearance-matched with the middle through hole of the nozzle.

[0009] The significant advantages of the utility model are: simple production and a large number of standard parts; the powder tube is a wearing part, which is very simple to produce and replace, and the cost is low; no cooling devices such as cooling water channels / air channels are required, the diameter of the entire powder feeding head is small, and it has strong adaptability to the shape of parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a schematic diagram of the overall structure of the lateral powder feeding head of the present utility model.

[0011] Figure 2 for Figure 1 Schematic diagram of the structure of the powder feeding hose connector in the structure shown.

[0012] Figure 3-1 for Figure 1 Schematic diagram of the structure of the powder hose fixed head in the structure shown.

[0013] Figure 3-2 for Figure 3-1 a cross-sectional view of the structure shown;

[0014] Figure 4-1 This is a schematic diagram of the structure of the powder hose protection cover;

[0015] Figure 4-2 for Figure 4-1 a cross-sectional view of the structure shown;

[0016] Figure 5 For Figure 1 The structure diagram of the powder pipe cross circular ring positioning piece in the structure shown.

[0017] Figure 6 For Figure 1 The structure diagram of the nozzle in the structure shown. DETAILED DESCRIPTION

[0018] The utility model will be described further in detail below with reference to the drawings.

[0019] The utility model discloses a laser powder feeding cladding lateral powder feeding head of quick replacement powder feeding pipe, including powder feeding hose joint 1, powder feeding hose joint includes a metal disc 2-1, and the middle of the metal disc is connected with a powder feeding hose quick plug interface 2-2, one end of the powder feeding hose quick plug interface is connected with powder feeding hose, and introduces cladding powder.The outlet end of powder feeding hose quick plug interface passes through the bottom surface of metal disc and inserts the top surface aperture of powder pipe fixed head 2, and the bottom surface of metal disc where the outlet end is located is sealingly fixedly connected between the top surface aperture of powder pipe fixed head.The middle of the metal disc is preferably provided with an internal thread hole, and the powder feeding hose quick interface is threadedly connected with the metal disc through the internal thread hole.

[0020] The outer wall of the powder pipe fixed head 2 is an external thread surface, the middle of the powder pipe fixed head is provided with a stepped through hole, the bottom of the top surface aperture in the stepped through hole is connected with the top of the lower aperture in the stepped through hole through a reduced diameter hole, and the lower aperture is a straight hole with a diameter larger than that of the reduced diameter hole.As an embodiment of the utility model, the top surface aperture can be a tapered hole, and the diameter of the small opening of the tapered hole is smaller than that of the straight hole.The lower aperture is preferably provided with a plurality of rubber ring grooves on the inner wall, and a rubber ring is arranged in the rubber ring groove.The tapered hole of the powder pipe fixed head receives the cladding powder sent by the powder feeding hose, and the surface of the tapered hole is preferably a smooth surface, which is polished to prevent powder from sticking.The powder pipe is inserted into the straight hole and pressed against the reduced diameter hole to determine the position, and the rubber ring plays the role of sealing and fixing the powder pipe.The cladding powder enters the powder pipe fixed head after being sent from the powder feeding hose to the tapered hole through the powder feeding hose joint and naturally converging and falling along the hole wall.

[0021] The top of the powder hose 3 is inserted into the straight hole of the powder hose fixing head, and the top of the powder hose rests on the shoulder where the reduced diameter hole connects to the straight hole. The powder hose and the straight hole are spaced apart. A powder hose protective sleeve 4 is disposed over the powder hose. The upper and lower ends of the powder hose protective sleeve each have an internally threaded hole. The internally threaded hole at the upper end of the powder hose protective sleeve is threadedly connected to the externally threaded hole of the powder hose fixing head, and the internally threaded hole at the lower end of the powder hose protective sleeve is threadedly connected to the externally threaded hole end of the nozzle 6. The lower end of the powder hose is disposed through the middle through-hole of the nozzle, and the lower end of the powder hose and the middle through-hole of the nozzle are spaced apart. Preferably, a cross-ring locating piece 5 is squeezed and fixed within the powder hose protective sleeve and sleeved onto the powder hose. Preferably, the cross-ring locating piece includes an inner ring and an outer ring, which are connected by a connecting rib. The inner ring sleeves onto the powder hose and has a notch on the inner ring. The nozzle can be made of red copper, with a conical upper end and a cylindrical lower end. The total length of the thread at the external threaded hole end of the nozzle is greater than the length of the internal threaded hole at the lower end of the powder hose protective sleeve, ensuring that the powder hose cross ring positioning piece can be squeezed tightly when screwing in.

[0022] The powder hose protective cover protects the powder hose from collisions and also serves to prevent reflected laser light from directly irradiating the powder hose. Preferably, the cross-ring positioning piece is located no more than one-third of the total length of the protective cover. Furthermore, preferably, a threaded hole is provided on the outer wall of the protective cover for connection. This threaded hole is connected to a quick-connect hose connector for connecting the shielding gas hose.

[0023] The powder hose is a channel for conveying cladding powder and shielding gas to the laser pool. One end is connected to the powder hose mounting head, and the other end is directed toward the laser pool. Cladding powder is fed by a pneumatic powder feeder through the quick-connect connector of the powder feed hose and into the powder hose, ultimately reaching the laser pool. The pneumatic powder feeder's high-pressure gas is selected from the shielding gas required for the laser cladding process, such as Ar. This shielding gas is then delivered to the laser pool simultaneously with the cladding powder through the powder hose. The powder hose can be made of standard copper fittings, with the specific diameter determined by the size of the powder spot formed by the falling cladding powder during the laser cladding process.

[0024] The cross-ring locating piece 5 is used to orient the powder hose. If the powder hose is secured solely with a rubber ring, it may deviate from its original orientation. Replacing the powder hose may cause the powder feeding position to shift. Therefore, the cross-ring locating piece is necessary for orientation. The cross-ring locating piece can be made of metal or polymer material.

[0025] The nozzle is connected to the powder hose protective sleeve through a thread. Its function is to protect the powder hose from being irradiated by the reflected laser over a large area. Secondly, it gathers the shielding gas connected from the quick connector on the side wall of the powder hose protective sleeve and distributes it around the laser molten pool, thereby establishing a protective atmosphere and improving the protection effect.

[0026] The working process of the device is as follows:

[0027] After the components of the laser powder feeding and cladding lateral powder feeding head with replaceable powder feeding pipe are assembled, the powder feeding pipe is fixed by clamping the outer wall of the powder pipe protective sleeve 4, so that the powder pipe is aligned with the laser molten pool, and the front end of the powder pipe is 15-20 mm away from the laser molten pool.

[0028] After the position of the lateral powder feeding head is fixed, the protective gas is introduced through the hose quick connector on the outer wall of the powder pipe protective sleeve, and then the protective atmosphere is formed on the surface of the part to be cladded. Then, the switch of the gas pressure powder feeder is opened, so that the cladding powder enters the lateral powder feeding head. After the cladding powder is sprayed from the powder pipe, the laser switch is opened, and the laser is output to start the laser cladding process.

[0029] After the laser cladding process is completed, the laser is first turned off to stop the laser output, then the gas pressure powder feeder is turned off, and finally the protective gas is disconnected.

Claims

1. A laser powder cladding lateral powder feeding head with a quick replaceable powder feeding tube, characterized by: It comprises a powder feeding hose connector, which comprises a metal disc, with a powder feeding hose quick plug interface connected in the middle of the metal disc, one end of the powder feeding hose quick plug interface is connected to the powder feeding hose, the outlet end of the powder feeding hose quick plug interface passes through the bottom surface of the metal disc and is inserted into the top surface opening of the powder tube fixing head, and the bottom surface of the metal disc where the outlet end is located and the top surface opening of the powder tube fixing head are sealed and fixedly connected; the outer wall of the powder tube fixing head is an external threaded surface, and a stepped through hole is opened in the middle of the powder tube fixing head, and the bottom of the top surface opening constituting the stepped through hole and the top of the lower opening constituting the stepped through hole are connected by a reduced diameter hole, and the lower opening is a straight hole and its diameter is larger than the diameter of the reduced diameter hole; The upper part of the powder tube is inserted into the straight hole of the powder tube fixing head and the top end of the powder tube is pressed against the shoulder of the hole where the reduced diameter hole and the straight hole are connected. The powder tube and the straight hole are clearance-matched. A powder tube protective sleeve is provided on the outer sleeve of the powder tube. The upper and lower ends of the powder tube protective sleeve are respectively internal threaded holes. The internal threaded hole at the upper end of the powder tube protective sleeve is threadedly connected with the external thread of the powder tube fixing head. The internal threaded hole at the lower end of the powder tube protective sleeve is threadedly connected with the external threaded hole end of the nozzle. The lower end of the powder tube is arranged through the middle through hole of the nozzle, and the lower end of the powder tube is clearance-matched with the middle through hole of the nozzle.

2. The laser powder cladding lateral powder feeding head with a quickly replaceable powder feeding tube according to claim 1 is characterized in that: The top surface opening is a tapered hole, and the diameter of the tapered hole is smaller than the diameter of the straight hole.

3. The laser powder cladding lateral powder feeding head with a quickly replaceable powder feeding tube according to claim 2 is characterized in that: The surface of the tapered hole is a smooth surface.

4. The laser powder cladding lateral powder feeding head with a quickly replaceable powder feeding tube according to claim 1 is characterized in that: A plurality of rubber ring grooves are formed on the inner wall of the lower opening, and rubber rings are arranged in the rubber ring grooves.

5. The laser powder cladding lateral powder feeding head with a quickly replaceable powder feeding tube according to claim 1 is characterized in that: The cross ring positioning piece is squeezed and fixed in the powder hose protective sleeve and is put on the powder hose.

6. The laser powder cladding lateral powder feeding head with a quickly replaceable powder feeding tube according to claim 5 is characterized in that: The cross ring positioning piece comprises an inner ring and an outer ring, the inner ring and the outer ring are connected via a connecting rib, the inner ring is sleeved on the powder tube and a notch is opened on the inner ring.

7. The laser powder cladding lateral powder feeding head with a quickly replaceable powder feeding tube according to claim 1 is characterized in that: A threaded hole for connection is provided on the outer wall of the protective sleeve. The threaded hole for connection is connected to a hose quick-plug interface. The hose quick-plug interface is used to connect the protective gas hose.

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