Abrasive water jet polishing device for small-inner-diameter polymer material pipe fitting

Abstract

The utility model discloses an abrasive water jet polishing device for a small-inner-diameter polymer material pipe fitting. Comprising a storage assembly, the input end of a nozzle assembly communicates with the output end of the storage assembly, the output end of the nozzle assembly is of a through hole structure, a connecting piece is connected to the output end of the nozzle assembly, a flow channel is formed in the middle of the connecting piece, a to-be-treated pipe fitting is coaxially arranged in the flow channel, and the input end of the flow channel communicates with the output end of the nozzle assembly; the output end of the runner is communicated with the storage assembly through the recovery assembly to form a loop, and the stirring assembly is communicated with the storage assembly and used for stirring materials in the storage assembly. According to the utility model, the abrasive water jet polishing technology is applied to the polishing of polymer material pipe fittings, the processing requirements of various non-linear and complex runners can be met, and the front mixing type abrasive water jet is adopted, so that the polishing effect is good and the efficiency is high.

Description

Technical Field

[0001] The utility model relates to the technical field of abrasive water jet polishing devices, in particular to an abrasive water jet polishing device for small inner diameter polymer material pipe fittings. Background Art

[0002] 3D printing technology is an important technology in the current manufacturing industry and is widely used in the fields of aerospace technology, automotive industry, and medicine to manufacture parts with complex shapes. However, the surface finish of parts manufactured by 3D printing technology is generally not high, especially for the internal channels of the parts, which require subsequent polishing to solve the surface roughness problem.

[0003] The polishing methods for the internal channels of components currently include water jet, ice jet, abrasive flow, etc., but each method has certain limitations. Water jet processing stress is small, and the effect is average when polishing polymer materials with higher hardness; although ice jet can ensure that the polishing process is pollution-free, the working conditions are harsh and the preparation of tiny ice particles is difficult; abrasive flow is difficult to polish the small-diameter complex flow channels of additively manufactured components due to the high viscosity of the fluid, and it is difficult to clean after processing.

[0004] In response to the above problems, some scholars have proposed an abrasive water jet polishing method, which uses a fine nozzle to spray an aqueous solution mixed with abrasives onto the surface to be polished, and uses the mutual impact and shearing effect between the abrasive particles and the surface to achieve material removal. The abrasive water jet has good fluidity and can flow fully in various small-caliber, nonlinear complex channels. It has good adaptability to the internal channels of additively manufactured parts. Due to the mixture of a large number of tiny hard abrasive particles, the jet also has sufficient impact and shear effects on polymer materials, which makes up for the defect of insufficient stress in pure water jet processing. In summary, abrasive water jets can be used to polish small inner diameter polymer material pipes. Utility Model Content

[0005] The utility model provides an abrasive water jet polishing device for small inner diameter polymer material pipe fittings. By using the front-mixed abrasive water jet polishing technology and a detachable connector, high-precision polishing of the inner wall of small inner diameter polymer material pipe fittings of various shapes can be achieved.

[0006] The technical solution adopted by the utility model is:

[0007] Including a storage component;

[0008] It includes a nozzle assembly, the input end of which is connected to the output end of the material storage assembly, and the output end of the nozzle assembly is a through-hole structure;

[0009] It includes a connecting piece connected to the output end of the nozzle assembly, a flow channel with a diameter of 10 mm is opened in the middle, a pipe to be processed is coaxially arranged in the flow channel, the input end of the flow channel is connected to the output end of the nozzle assembly, and the output end of the flow channel is connected to the material storage assembly through the recovery assembly to form a loop;

[0010] The utility model comprises a stirring component which is connected with the material storage component and is used for stirring the abrasive in the material storage component.

[0011] The material storage assembly is a box structure, and the material storage assembly includes a partition arranged horizontally in the box body, which is divided into an upper water tank and a lower abrasive mixture box, and a hole is opened in the middle of the partition, and a filter element is arranged in the hole;

[0012] Two through holes are respectively opened on the upper and lower parts of the two opposite sides of the abrasive mixture box, one of the through holes in the upper part is connected to the input end of the nozzle assembly, and the other through hole in the upper part is connected to the output end of the recovery assembly, one of the through holes in the lower part is connected to the input end of the stirring assembly, and the other through hole in the lower part is connected to the output end of the stirring assembly.

[0013] A first centrifugal pump, a pressure regulating valve and a flow meter are sequentially connected between the abrasive mixture box and the nozzle assembly.

[0014] The nozzle assembly is a cubic structure, and a funnel-shaped cavity narrowing from the input end to the output end is opened inside the nozzle assembly. The input end of the cavity is connected to a through hole on the upper part of the abrasive mixture box, and the output end of the cavity is connected to the flow channel of the connecting piece.

[0015] The connecting piece is a cubic structure, and an annular groove is opened in the middle of the surface of the connecting piece close to the nozzle assembly. The annular groove is arranged on the surface of the annular connecting piece at the outer periphery of the flow channel. There is a gap between the annular groove and the flow channel. A rubber sealing ring is arranged in the annular groove to prevent leakage between the nozzle assembly and the connecting piece.

[0016] The recovery component comprises a recovery funnel with a conical structure, the input end of the recovery funnel is connected to the output end of the flow channel, and the output end of the recovery funnel is connected to another through hole of the abrasive mixture box.

[0017] The stirring assembly comprises a second centrifugal pump, and the input end and the output end of the second centrifugal pump are respectively connected to the two through holes at the lower part of the abrasive mixture box.

[0018] A pressure gauge is provided between the flow meter and the nozzle assembly to monitor the actual flow rate and pressure, and a switch valve is provided between the recovery assembly and the material storage assembly.

[0019] The structure of the pipe to be processed is a straight pipe structure, and the inner diameter of the straight pipe is less than 5 mm.

[0020] Abrasives are placed in the abrasive mixture box, and the material of the abrasives is silicon carbide.

[0021] The beneficial effects of the utility model are:

[0022] 1. The abrasive water jet polishing technology is applied to the polishing of polymer pipe fittings. There is no thermal impact and thermal deformation during the processing, which can meet the processing requirements of various nonlinear and complex flow channels. And the front-mixed abrasive water jet is used, which has good polishing effect and high efficiency.

[0023] 2. The nozzle adopts a funnel-shaped structure, and optimizes the design of parameters such as outlet length, inlet angle and inlet diameter to enhance the jet effect, improve jet stability and extend the service life of the nozzle;

[0024] 3. The micro-channel nozzle can be used to polish small inner diameter pipes with an inner diameter of less than 5mm;

[0025] 4. The pipeline is equipped with a flow meter, a pressure gauge and a pressure regulating valve, which can monitor the working conditions in real time and flexibly adjust the water jet according to the polishing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Schematic diagram of the flow of abrasive water jet polishing device.

[0027] Figure 2 Schematic diagram of the material storage component structure.

[0028] Figure 3 Schematic diagram of the nozzle assembly.

[0029] Figure 4 A schematic diagram of the connector.

[0030] Figure 5 This is an exploded view of the connector.

[0031] Figure 6 This is the filter element structure diagram.

[0032] As shown in the figure: 1. material storage assembly, 101. water tank, 102. abrasive mixture box, 103. filter element, 2. nozzle assembly, 201. nozzle flow channel, 3. connecting piece, 301. inner flow channel, 302. annular groove, 303. sealing rubber ring, 4. stirring assembly, 401. first centrifugal pump, 402. second centrifugal pump, 5. pressure regulating valve, 6. flow meter, 7. pressure gauge, 8. pipe fittings to be processed, 9. switch valve. DETAILED DESCRIPTION

[0033] The utility model is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] like Figure 1 and Figure 6As shown, the abrasive water jet polishing device comprises a material storage assembly 1, a nozzle assembly 2 and a recovery assembly which are connected in sequence to form a loop, the material storage assembly 1 is a box structure, the material storage assembly 1 comprises a partition arranged horizontally in the box body, which is divided into an upper water tank 101 and a lower abrasive mixture box 102, a threaded hole is opened in the middle of the partition, and a filter element 103 is threadedly connected in the threaded hole, which is used to prevent the abrasive in the lower abrasive mixture box 102 from entering the water tank 101;

[0035] like Figure 2 As shown, two through holes are respectively opened on the upper and lower parts of the two opposite sides of the abrasive mixture box 102, one of the through holes in the upper part is connected to the input end of the nozzle assembly 2, and the other through hole in the upper part is connected to the output end of the recovery assembly, one of the through holes in the lower part is connected to the input end of the stirring assembly 4, and the other through hole in the lower part is connected to the output end of the stirring assembly 4. The stirring assembly 4 includes a second centrifugal pump 402, and the input end and the output end of the second centrifugal pump 402 are respectively connected to the two through holes in the lower part of the abrasive mixture box 102, which are used to stir and mix the abrasive and water in the abrasive mixture box 102. Abrasives are placed in the abrasive mixture box 102, and the material of the abrasives is silicon carbide.

[0036] like Figure 3 As shown, the nozzle assembly 2 is a cubic structure, and a funnel-shaped cavity is opened inside the nozzle assembly 2, which narrows from the input end to the output end. The input end of the cavity is connected to a through hole on the upper part of the abrasive mixture box 102, and the output end of the cavity is connected to the flow channel 301 of the connecting piece 3.

[0037] The connecting piece 3 is arranged at the output end of the nozzle assembly 2 and is connected to the nozzle assembly 2. A flow channel 301 with a diameter of 10 mm is opened in the middle of the connecting piece 3. The peripheral wall of the flow channel 301 is provided with an internal thread for threaded connection to the pipe fitting 8 to be processed coaxially arranged in the flow channel 301. During polishing, the outer periphery of the pipe fitting 8 to be processed is covered with a threaded outer sleeve and connected to the flow channel 301. The pipe fitting 8 to be processed is made of polymer material, generally a straight pipe and a curved pipe, and the inner diameter of the pipe is less than 5 mm. The input end of the flow channel 301 is connected to the output end of the cavity of the nozzle assembly 2, and the inner wall of the pipe fitting 8 to be processed is polished by a jet of water. The output end of the cavity is a narrow section of the nozzle flow channel 201 with a funnel-shaped structure. The nozzle flow channel 201 is a through-hole structure with a diameter of 5 mm. The output end of the flow channel 301 is connected to the recovery component, and the output end of the nozzle assembly 2 is coaxial with the flow channel 301 of the connecting piece 3.

[0038] The recovery component includes a recovery funnel with a conical structure, the input end of the recovery funnel is connected to the output end of the flow channel 301, and the output end of the recovery funnel is connected to another through hole of the abrasive mixture box 102 to form a loop.

[0039] Since the injection pressure and abrasive concentration of the abrasive water jet are important parameters that affect the polishing effect, a first centrifugal pump 401, a pressure regulating valve 5 and a flow meter 6 are connected in sequence between the abrasive mixture box 102 and the nozzle assembly 2; a pressure gauge 7 is provided between the flow meter 6 and the nozzle assembly 2, which can monitor the working conditions in real time and flexibly adjust the water jet according to the polishing effect. Since leakage is inevitable at the pipeline connection, a switch valve 9 is provided between the recovery assembly and the storage assembly 1.

[0040] like Figure 4 and Figure 5 As shown, the connecting piece 3 is a cubic structure, and an annular groove 302 is opened in the middle of the surface of the connecting piece 3 close to the nozzle assembly 2. The annular groove 302 is arranged on the surface of the annular connecting piece 3 at the outer periphery of the flow channel 301, and there is a gap between the annular groove 302 and the flow channel 301. A rubber sealing ring 303 is arranged in the annular groove 302 to prevent leakage between the nozzle assembly 2 and the connecting piece 3. The connecting piece 3 and the nozzle assembly 2 are fixedly connected by screws.

[0041] The working process of the utility model is as follows:

[0042] The abrasive is placed in the abrasive mixture box 102, and the water in the water tank 101 enters the abrasive mixture box 102 through the filter element 103. Under the action of the second centrifugal pump 402, the water and abrasive in the abrasive mixture box 102 are stirred and mixed to form a water-abrasive mixed liquid, which is then pumped into the funnel-shaped cavity of the nozzle assembly 2 through the pressure regulating valve 5 and the flow meter 6 under the action of the first centrifugal pump 401, and is sprayed into the flow channel 301 of the connecting piece through the nozzle flow channel 201, a narrow section of the lower part of the funnel-shaped cavity, and the flow channel 301 is threadedly connected to a pipe fitting 8 to be processed. The water-abrasive mixed liquid sprayed from the nozzle flow channel 201 is sprayed onto the inner wall of the pipe fitting 8 to be processed for polishing. The output end of the water-abrasive mixed liquid ejected from the flow channel 301 is recovered through the recovery funnel and enters the abrasive mixture box 102 for reuse to complete the polishing operation.

Claims

1. An abrasive water jet polishing device for small inner diameter polymer material pipe fittings, characterized in that: It comprises a material storage component (1); It comprises a nozzle assembly (2), the input end of which is connected to the output end of the material storage assembly (1), and the output end of the nozzle assembly (2) is a through-hole structure; It comprises a connecting piece (3) connected to the output end of the nozzle assembly (2), a flow channel (301) is opened in the middle, a pipe (8) to be processed is coaxially arranged in the flow channel (301), the input end of the flow channel (301) is connected to the output end of the nozzle assembly (2), and the output end of the flow channel (301) is connected to the material storage assembly (1) through the recovery assembly to form a loop; It comprises a stirring component (4) which is connected to the material storage component (1) and is used for stirring the abrasive in the material storage component (1).

2. The abrasive water jet polishing device for small inner diameter polymer material pipe fittings according to claim 1, characterized in that: The material storage assembly (1) is a box structure, comprising a partition plate arranged horizontally in the box body, which is divided into an upper water tank (101) and a lower abrasive mixture tank (102), the partition plate having a hole in the middle, and a filter element (103) in the hole; The upper and lower parts of the two opposite sides of the abrasive mixture box (102) are respectively provided with two through holes, one of the through holes in the upper part is connected to the input end of the nozzle assembly (2), the other through hole in the upper part is connected to the output end of the recovery assembly, one of the through holes in the lower part is connected to the input end of the stirring assembly (4), and the other through hole in the lower part is connected to the output end of the stirring assembly (4).

3. The abrasive water jet polishing device for small inner diameter polymer material pipe fittings according to claim 2, characterized in that: A first centrifugal pump (401), a pressure regulating valve (5) and a flow meter (6) are sequentially connected between the abrasive mixture box (102) and the nozzle assembly (2).

4. The abrasive water jet polishing device for small inner diameter polymer material pipe fittings according to claim 2, characterized in that: The nozzle assembly (2) is a cubic structure, and a funnel-shaped cavity is provided inside the nozzle assembly (2), which becomes narrower from the input end to the output end, the input end of the cavity is connected to a through hole at the top of the abrasive mixture box (102), and the output end of the cavity is connected to the flow channel (301) of the connecting piece (3).

5. The abrasive water jet polishing device for small inner diameter polymer material pipe fittings according to claim 1, characterized in that: The connecting piece (3) is a cubic structure. An annular groove (302) is formed in the middle of the surface of the connecting piece (3) close to the nozzle assembly (2). The annular groove (302) is arranged on the surface of the annular connecting piece (3) at the outer periphery of the flow channel (301). There is a gap between the annular groove (302) and the flow channel (301). A rubber sealing ring (303) is arranged in the annular groove (302) to prevent leakage between the nozzle assembly (2) and the connecting piece (3).

6. The abrasive water jet polishing device for small inner diameter polymer material pipe fittings according to claim 2, characterized in that: The recovery component comprises a recovery funnel with a conical structure, the input end of the recovery funnel being connected to the output end of the flow channel (301), and the output end of the recovery funnel being connected to another through hole of the abrasive mixture box (102).

7. The abrasive water jet polishing device for small inner diameter polymer material pipe fittings according to claim 2, characterized in that: The stirring assembly (4) comprises a second centrifugal pump (402), wherein an input end and an output end of the second centrifugal pump (402) are respectively connected to two through holes at the bottom of the abrasive mixture box (102).

8. The abrasive water jet polishing device for small inner diameter polymer material pipe fittings according to claim 3, characterized in that: A pressure gauge (7) is provided between the flow meter (6) and the nozzle assembly (2) for monitoring the actual flow rate and pressure, and a switch valve (9) is provided between the recovery assembly and the material storage assembly (1).

9. The abrasive water jet polishing device for small inner diameter polymer material pipe fittings according to claim 1, characterized in that: The structure of the pipe to be processed (8) is a straight pipe structure, and the inner diameter of the straight pipe is less than 5 mm.

10. The abrasive water jet polishing device for small inner diameter polymer material pipe fittings according to claim 2, characterized in that: Abrasives are placed in the abrasive mixture box (102), and the material of the abrasives is silicon carbide.

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