Plastic electroplating pretreatment equipment

Abstract

The invention provides plastic electroplating pretreatment equipment. The plastic electroplating pretreatment equipment comprises a box body, a stirring mechanism and a liquid injection and drainage mechanism, the stirring mechanism is mounted in the box body and is used for stirring liquid in the box body; the liquid injection and discharge mechanism can inject liquid into the box body and discharge the liquid out of the box body. A plastic workpiece is placed in the box body; according to the operations of hydrophilicity, coarsening, reduction, activation, peptization and the like, liquid of the corresponding steps is injected into the box body through the liquid injection and drainage mechanism, after the previous process step is completed, the solution in the box body is discharged through the liquid injection and drainage mechanism, and then the solution of the next process step is introduced; therefore, a plurality of pretreatment process steps such as hydrophilicity, coarsening, reduction, activation and peptization can be carried out on the plastic workpiece in one box body, so that the occupied area can be greatly reduced, and the pretreatment device is suitable for pretreatment of the plastic workpiece in the test stage; and when the plastic workpiece is treated, liquid in the box body can be stirred according to requirements, so that the mixing uniformity of the solution in the box body is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of plastic electroplating pretreatment, and in particular to plastic electroplating pretreatment equipment. Background Art

[0002] Compared with metal parts, plastic electroplating products can not only achieve a good metal texture, but also reduce the weight of the products. While effectively improving the appearance and decorativeness of plastics, it also improves its electrical, thermal and corrosion resistance performance. However, the selection of plastic materials for electroplating must comprehensively consider factors such as material processing performance, mechanical properties, material cost, electroplating cost, difficulty of electroplating, and dimensional accuracy. Due to its structural advantages, it not only has excellent comprehensive performance and is easy to process and shape, but also the material surface is easy to erode to obtain a higher coating bonding strength, so it is widely used in electroplating.

[0003] Before plastic electroplating, the plastic workpiece needs to be pre-treated; different solutions are used to make the plastic workpiece hydrophilic, roughened, reduced, activated, and debonded; in an industrial mass production environment, these operations are carried out step by step on the assembly line. However, for plastic electroplating material manufacturers, when they are in the stage of laboratory experimental needs or small-scale tests, the above-mentioned production lines with a complete configuration in equal proportions have too high production costs and occupy a large area, which is not suitable for the pre-treatment of plastic workpieces in the test stage. Summary of the invention

[0004] In view of the above problems existing in the prior art, the technical problem to be solved by the present invention is: when it is in the stage of laboratory experiment needs or small-scale test needs, the above-mentioned production line with a complete proportional configuration has too high production cost and occupies a large area, which is not suitable for the pre-treatment of plastic workpieces in the test stage.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solution: a plastic electroplating pretreatment device, comprising:

[0006] Box;

[0007] A stirring mechanism is installed in the box to stir the liquid in the box; and

[0008] The liquid injection and discharge mechanism can inject liquid into and discharge liquid from the box body.

[0009] Preferably, the stirring mechanism includes: a base, a motor, a stirring tube and a pump body; the base is hollow and coaxially and rotatably mounted on the bottom of the box; the motor can drive the base to rotate; a plurality of stirring tubes are arranged in a circular array with the axis of the base as the center, and one end of the stirring tube is fixedly mounted on the base and connected to the base, and the other end of the stirring tube is closed; a plurality of spray holes are opened in the length direction of the stirring tube; the pump body can pump the liquid in the box into the base.

[0010] Preferably, the stirring mechanism also includes: a rotating tube, a connecting tube, an air pump and a limiting tube; the rotating tube and the connecting tube are respectively arranged on opposite sides of the base, and the rotating tube and the connecting tube are both located on the axis of the base, one end of the rotating tube and the connecting tube are both fixedly mounted on the base and communicated with the base; the other end of the rotating tube is communicated with the air pump, and the other end of the connecting tube is communicated with the pump body, one end of the rotating tube is fixedly mounted on the base, and the rotating tube is communicated with the base, and the rotating tube is rotatably mounted on the box body; the two ends of the limiting tube are respectively slidably inserted into the rotating tube and the connecting tube, and extend into the base; the end of the limiting tube close to the rotating tube is closed, and the end close to the connecting tube is open; and a through groove is provided on the side of the limiting tube close to the connecting tube.

[0011] Preferably, a plurality of through grooves are provided in the circumferential direction of the limiting tube.

[0012] Preferably, the rotating tube comprises: a vertical section, a transverse section and a connecting elbow; the vertical section is arranged parallel to the circumference of the base, and the transverse section is arranged perpendicular to the axis of the base; the spray holes are opened on the vertical section and the transverse section; one end of the vertical section and the transverse section are connected through a connecting elbow; the other end of the vertical section is closed, and the other end of the transverse section is fixedly mounted on the base and connected to the base.

[0013] Preferably, it also includes a driving mechanism: the driving mechanism includes: a bevel gear, a circular slide rail, a slider, a gear ring and a driving gear; one end of the vertical section and the horizontal section can be rotatably mounted on the connecting elbow; and the connecting elbow is slidably mounted in the box body along the circumferential direction of the box body; bevel gears are coaxially fixed on one end of the vertical section and the horizontal section, and the two bevel gears are meshed with each other; the circular slide rail is coaxially fixed on the box body, and a slider is rotatably mounted on the end of the vertical section away from the connecting elbow, and the slider is slidably mounted on the circular slide rail; the gear ring is coaxially and rotatably mounted on the box body, and the driving gear is coaxially fixed on the vertical section, and the driving gear is meshed with the gear ring.

[0014] Preferably, the liquid injection and discharge mechanism comprises: a liquid suction pump and a liquid discharge pump; the liquid suction pump and the liquid discharge pump are connected to the box body through a pipeline.

[0015] Preferably, the inner bottom wall of the box body is arranged in the form of a spherical surface that is concave downward, and the pipeline of the drainage pump is connected to the lowest end of the inner bottom wall of the box body.

[0016] Preferably, a heater is also installed in the box.

[0017] Compared with the prior art, the present invention has at least the following advantages:

[0018] 1. In the present invention, a plastic workpiece is placed in a box; according to operations such as hydrophilicity, roughening, reduction, activation, and degumming, the liquid of the corresponding step is injected into the box through a liquid injection and discharge mechanism, and after the previous process step is completed, the solution in the box is discharged through the liquid injection and discharge mechanism, and then the solution of the next process step is introduced; in this way, multiple pre-treatment process steps such as hydrophilicity, roughening, reduction, activation, and degumming can be performed on the plastic workpiece in one box, thereby greatly reducing the occupied area, and being suitable for the pre-treatment of plastic workpieces in the test stage; and when the plastic workpiece is processed, the liquid in the box can be stirred as required to ensure the uniform mixing of the solution in the box.

[0019] 2. In the present invention, when it is necessary to stir the solution in the box, the motor and the pump body are controlled to open, and the pump body draws the solution in the box into the base. Under the action of pressure, the solution enters multiple stirring tubes and is discharged through the spray holes on the stirring tubes, so that part of the solution in the box can be preliminarily stirred, and when the solution is sprayed from the spray holes, a layer of water wall is formed, so that a blade-like structure can be formed; when the motor is in operation, the motor drives the multiple stirring tubes to rotate through the base, so that the water walls sprayed from the spray holes on the stirring tubes can be driven to rotate, so as to mechanically stir the solution in the box as a whole; and the sprayed solution can impact the solution in the box, thereby making the solution in the box more evenly mixed.

[0020] 3. In the present invention, when mechanical stirring is required, the pump body and the motor are turned on, and the air pump is turned off, so as to achieve mechanical stirring of the solution in the box, and the intensity of the mechanical stirring can be controlled by controlling the rotation speed of the motor and the power of the pump body. When air stirring is required, the air pump and the motor are turned on, and the pump body is turned off, so as to achieve multi-directional air stirring of the solution in the box, and the intensity of the air stirring can be controlled by controlling the rotation speed of the motor and the power of the air pump.

[0021] 4. In the present invention, the gear ring drives the gear to rotate, the gear drives the vertical section to rotate, and the vertical section drives the transverse section to rotate through two bevel gears, so that the spray hole on the vertical section faces the inner wall of the box body, and the spray hole on the transverse section faces the inner bottom wall of the box body; then the pump body is connected to the external water source, the pump body draws the external water source into the vertical section and the transverse section, and discharges it through the spray hole, so that the external water source is sprayed to the inner side wall and the bottom wall of the box body; the motor is controlled to move, and the motor drives the vertical section and the transverse section to revolve, so that the residual solution inside the box body can be cleaned by the external water source; after the cleaning is completed, the liquid in the box body is discharged through the injection and drainage mechanism, and then the solution of the next process step is introduced, so that the cross contamination between different solutions in different process steps can be effectively prevented; it can also be based on the specific situation of the plastic workpiece, by controlling the angle of the gear ring rotation, to control the angle of the spray hole on the vertical section and the transverse section, to achieve precise stirring of the solution in the box body, thereby improving the pre-treatment effect of the plastic workpiece. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific implementation of the present invention, the following will briefly introduce the drawings required for use in the specific implementation. In all the drawings, each element or part is not necessarily drawn according to the actual scale.

[0023] Figure 1 This is a schematic diagram of the structure of the plastic electroplating pretreatment equipment provided in an embodiment of the present invention.

[0024] Figure 2 This is a schematic diagram of the structure of a stirring tube provided in an embodiment of the present invention.

[0025] Figure 3 This is a schematic diagram of the structure of a portion of a stirring mechanism provided in an embodiment of the present invention.

[0026] Figure 4 This is a schematic diagram of the structure of the limiting tube provided in an embodiment of the present invention.

[0027] Figure numerals: 1-box body, 2-stirring mechanism, 21-base, 22-stirring tube, 221-spraying hole, 222-vertical section, 223-lateral section, 224-connecting elbow, 23-pump body, 24-rotating tube, 25-connecting tube, 26-limiting tube, 27-through groove, 3-driving mechanism, 31-bevel gear, 32-circular slide rail, 33-slider, 34-gear ring, 35-driving gear. DETAILED DESCRIPTION

[0028] The following embodiments of the technical solution of the present invention are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the protection scope of the present invention.

[0029] In the present invention, it is necessary to understand that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0030] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] See also Figure 1-Figure 4 The embodiment provided by the present invention is a plastic electroplating pretreatment device, characterized in that it comprises: a box 1, a stirring mechanism 2 and a liquid injection and discharge mechanism; the stirring mechanism 2 is installed in the box 1 to stir the liquid in the box 1; the liquid injection and discharge mechanism can inject and discharge liquid into the box 1. Furthermore, a heater is also installed in the box 1; the solution in the box 1 is heated by the heater.

[0032] During the specific implementation, the plastic workpiece is placed into the box 1; according to the operations of hydrophilicity, roughening, reduction, activation, degumming, etc., the liquid of the corresponding step is injected into the box 1 through the liquid injection and discharge mechanism, and after the previous process step is completed, the solution in the box 1 is discharged through the liquid injection and discharge mechanism, and then the solution of the next process step is introduced; in this way, the plastic workpiece can be subjected to multiple pre-treatment process steps such as hydrophilicity, roughening, reduction, activation, degumming, etc. in one box 1, thereby greatly reducing the occupied area, which is suitable for the pre-treatment of plastic workpieces in the test stage; and when the plastic workpiece is processed, the liquid in the box 1 can be stirred as needed to ensure the uniform mixing of the solution in the box 1.

[0033] See also Figure 1-Figure 4In other embodiments, the stirring mechanism 2 includes: a base 21, a motor, a stirring tube 22 and a pump body 23; the base 21 is hollow and coaxially and rotatably installed at the bottom of the box body 1; the motor can drive the base 21 to rotate; a plurality of stirring tubes 22 are arranged in a circular array with the axis of the base 21 as the center, and one end of the stirring tube 22 is fixedly installed on the base 21 and connected to the base 21, and the other end of the stirring tube 22 is closed; a plurality of spray holes 221 are opened in the length direction of the stirring tube 22; the pump body 23 can pump the liquid in the box body 1 into the base 21.

[0034] Specifically, when the solution in the box body 1 needs to be stirred, the control motor and the pump body 23 are turned on, and the pump body 23 draws the solution in the box body 1 into the base 21. Under the action of pressure, the solution enters the multiple stirring tubes 22 and is discharged through the spray holes 221 on the stirring tubes 22, so that part of the solution in the box body 1 can be preliminarily stirred, and when the solution is sprayed from the spray holes 221, a layer of water wall is formed, so that a blade-like structure can be formed; when the motor is in operation, the motor drives the multiple stirring tubes 22 to rotate through the base 21, so that the water wall sprayed from the spray holes 221 on the stirring tubes 22 can be driven to rotate, so as to mechanically stir the solution in the box body 1 as a whole; and the sprayed solution can impact the solution in the box body 1, thereby making the solution in the box body 1 more evenly mixed.

[0035] See also Figure 1-Figure 4 In other embodiments, the stirring mechanism 2 further includes: a rotating tube 24, a connecting tube 25, an air pump and a limiting tube 26; the base 21 is rotatably mounted on the box body 1 through the rotating tube 24, and the pump body 23 is connected to the base 21 through the connecting tube 25; the rotating tube 24 and the connecting tube 25 are respectively arranged on opposite sides of the base 21, and the rotating tube 24 and the connecting tube 25 are both located on the axis of the base 21, and one end of the rotating tube 24 and the connecting tube 25 are fixedly mounted on the base 21 and connected to the base 21; the other end of the rotating tube 24 is connected to the air pump, and the other end of the connecting tube 25 is connected to the pump body 23, One end of the rotating tube 24 is fixedly mounted on the base 21, and the rotating tube 24 is connected to the base 21, and the rotating tube 24 is rotatably mounted on the box body 1; the two ends of the limiting tube 26 are respectively slidably inserted in the rotating tube 24 and the connecting tube 25, and extend into the base 21; the end of the limiting tube 26 close to the rotating tube 24 is closed, and the end close to the connecting tube 25 is open; and a through groove 27 is provided on the side of the limiting tube 26 close to the connecting tube 25; further, a plurality of through grooves 27 are provided in the circumferential direction of the limiting tube 26; thereby, the solution and the gas can evenly enter the plurality of stirring tubes 22.

[0036] In specific implementation, when mechanical stirring is required, the pump body 23 and the motor are turned on, and the air pump is turned off. The pump body 23 draws the solution in the box body 1 into the connecting tube 25, and the solution in the connecting tube 25 enters the limiting tube 26 through the open end of the limiting tube 26. At this time, the through groove 27 on the limiting tube 26 is blocked by the inner side wall of the connecting tube 25, so that the solution cannot flow into the base 21; under the action of the hydraulic pressure, the solution pushes the limiting tube 26 to slide toward the rotating tube 24; when the limiting tube 26 slides into the rotating tube 24, the closed end of the limiting tube 26 blocks the rotating tube 24, thereby blocking the rotating tube 24. , to prevent the solution from entering the rotating tube 24; at this time, the through groove 27 on the limiting tube 26 slides into the base 21, so as to connect the limiting tube 26 and the base 21 through the through groove 27; in this way, the solution can enter the base 21 through the connecting tube 25, the limiting tube 26, and the through groove 27 in sequence, and enter the multiple stirring tubes 22, and be sprayed out through the spray holes 221 on the stirring tube 22. At the same time, the motor drives the stirring tube 22 to rotate, so as to realize mechanical stirring of the solution in the box body 1, and the intensity of the mechanical stirring can be controlled by controlling the rotation speed of the motor and the power of the pump body 23.

[0037] When air stirring is required, the air pump and the motor are turned on, the pump body 23 is closed, and the air pump conveys gas toward the rotating tube 24. Under the action of air pressure, the gas applies a thrust to the closed end of the limiting tube 26, so that the limiting tube 26 slides toward the connecting tube 25; when the through groove 27 on the limiting tube 26 completely slides into the connecting tube 25, the closed end of the limiting tube 26 slides out of the rotating tube 24, so that the rotating tube 24 can be connected with the base 21, and the limiting tube 26 blocks the connecting tube 25 to prevent the gas from entering the connecting tube 25; the gas passes through the rotating tube 24, the base 21, and the stirring tube 22 in turn, and is discharged from the spray hole 221 on the stirring tube 22; at the same time, the motor drives the stirring tube 22 to rotate, so as to realize multi-directional air stirring of the solution in the box 1, and the intensity of the air stirring can be controlled by controlling the rotation speed of the motor and the power of the air pump.

[0038] See also Figure 1-Figure 4In other embodiments, the stirring tube 22 includes: a vertical section 222, a transverse section 223 and a connecting elbow 224; the vertical section 222 is arranged parallel to the circumference of the base 21, and the transverse section 223 is arranged perpendicular to the axis of the base 21; the spray hole 221 is provided on the vertical section 222 and the transverse section 223; one end of the vertical section 222 and the transverse section 223 are connected through the connecting elbow 224; the other end of the vertical section 222 is closed, and the other end of the transverse section 223 is fixedly mounted on the base 21 and connected with the base 21. In specific implementation, the solution is sprayed in the vertical direction of the box body 1 through the spray hole 221 on the transverse section 223, and the solution is sprayed in the transverse direction of the box body 1 through the spray hole 221 on the vertical section 222; thereby, the solution in the box body 1 can be initially stirred in both the transverse and vertical directions.

[0039] See also Figure 1-Figure 4 In other embodiments, a driving mechanism 3 is also included: the driving mechanism 3 includes: a bevel gear 31, a circular slide rail 32, a slider 33, a ring gear 34 and a driving gear 35; one end of the vertical section 222 and the horizontal section 223 can be rotatably mounted on the connecting elbow 224; and the connecting elbow 224 is slidably mounted in the box body 1 along the circumferential direction of the box body 1; a bevel gear 31 is coaxially fixed on one end of the vertical section 222 and the horizontal section 223, and the two bevel gears 31 are meshed with each other; the circular slide rail 32 is coaxially fixed on the box body 1, and the end of the vertical section 222 away from the connecting elbow 224 is rotatably mounted with a slider 33, and the slider 33 is slidably mounted on the circular slide rail 32; the ring gear 34 is coaxially and rotatably mounted on the box body 1, and the driving gear 35 is coaxially fixed on the vertical section 222, and the driving gear 35 is meshed with the ring gear 34.

[0040] In specific implementation, after the previous process step is completed, the solution in the box body 1 is discharged through the liquid injection and discharge mechanism; then the gear ring 34 is rotated, the gear ring 34 drives the gear to rotate, the gear drives the vertical section 222 to rotate, and the vertical section 222 drives the horizontal section 223 to rotate through the two bevel gears 31, so that the spray hole 221 on the vertical section 222 faces the inner wall of the box body 1, and the spray hole 221 on the horizontal section 223 faces the inner bottom wall of the box body 1; then the pump body 23 is connected to the external water source, the pump body 23 draws the external water source into the vertical section 222 and the horizontal section 223, and discharges it through the spray hole 221, so that the external water source is sprayed to the inner wall and bottom of the box body 1. wall; control the action of the motor, the motor drives the vertical section 222 and the horizontal section 223 to revolve, so that the residual solution inside the box 1 can be cleaned by an external water source; after the cleaning is completed, the liquid in the box 1 is discharged through the injection and drainage mechanism, and then the solution of the next process step is introduced, so that cross-contamination between different solutions in different process steps can be effectively prevented; further, it is also possible to control the angle of the spray hole 221 on the vertical section 222 and the horizontal section 223 by controlling the rotation angle of the gear ring 34 according to the specific situation of the plastic workpiece, so as to achieve precise stirring of the solution in the box 1, thereby improving the pre-treatment effect on the plastic workpiece.

[0041] See also Figure 1-Figure 4 In another embodiment, the injection and discharge mechanism includes: a liquid suction pump and a liquid discharge pump; the liquid suction pump and the liquid discharge pump are connected to the box 1 through a pipeline; the solutions of different processes are sucked into the box 1 by the liquid suction pump, and the solutions in the box 1 are discharged by the liquid discharge pump. Furthermore, the inner bottom wall of the box 1 is set as a spherical surface that is concave downward, and the pipeline of the liquid discharge pump is connected to the lowest end of the inner bottom wall of the box 1. Therefore, the solution in the box 1 can be discharged more conveniently, and the residual solution in the box 1 can be reduced, thereby effectively preventing the cross contamination between different solutions in different process steps.

[0042] In the specific implementation process, when performing the hydrophilic process step, 15-35 ml / L of PL-1 hydrophilic agent and 50-200 g / L of sulfuric acid are added into the box 1; the temperature is set to 35-45°C, the time is set to 2-10 minutes, and after the time is over, the solution is discharged through the injection and discharge mechanism;

[0043] During the roughening process, 410-430 g / L of chromic anhydride, 400-430 g / L of sulfuric acid, and 2.5-10 ml / L of PL-2 roughening additive are added into the box 1; the temperature is set to 60-75°C, and the stirring mechanism 2 is used for mechanical or slight air stirring, and the time is set to 6-15 minutes. After the time is up, the solution is discharged through the injection and discharge mechanism;

[0044] During the reduction process, 935 ml / L of pure water, 30 ml / L of PL-3 reducing agent, and 35 ml / L of concentrated hydrochloric acid are added into the box 1; the temperature is set to 20-50°C, and the stirring mechanism 2 is used for air stirring, and the time is set to 1-3 minutes. After the time is up, the solution is discharged through the injection and discharge mechanism;

[0045] During the activation process, 650-730 ml / L of pure water, 270-350 ml / L of concentrated hydrochloric acid, and 3-8 ml / L of PL-5 palladium activator are added into the box 1; the temperature is set to 21-35°C, the time is set to 2-6 minutes, and after the time is up, the solution is discharged through the injection and discharge mechanism;

[0046] During the debonding process, 50-100 g / L of PL-6 debonding agent is added into the box 1; the temperature is set to 40-50°C, and the stirring mechanism 2 is used for gentle air; the stirring time is set to 0.5-5 minutes, and after the time is up, the solution is discharged through the injection and discharge mechanism.

[0047] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. A plastic electroplating pretreatment device, characterized in that: include: Box; A stirring mechanism is installed in the box body to stir the liquid in the box body; and The liquid injection and discharge mechanism can inject liquid into and discharge liquid from the box body.

2. The plastic electroplating pretreatment equipment according to claim 1, characterized in that: The stirring mechanism includes: a base, a motor, a stirring tube and a pump body; the base is hollow and coaxially and rotatably mounted on the bottom of the box; the motor can drive the base to rotate; a plurality of stirring tubes are arranged in a circular array with the axis of the base as the center, and one end of the stirring tube is fixedly mounted on the base and connected to the base, and the other end of the stirring tube is closed; a plurality of spray holes are opened in the length direction of the stirring tube; the pump body can pump the liquid in the box into the base.

3. The plastic electroplating pretreatment equipment according to claim 2, characterized in that: The stirring mechanism also includes: a rotating tube, a connecting tube, an air pump and a limiting tube; the rotating tube and the connecting tube are respectively arranged on opposite sides of the base, and the rotating tube and the connecting tube are both located on the axis of the base, one end of the rotating tube and the connecting tube are both fixedly mounted on the base and communicated with the base; the other end of the rotating tube is communicated with the air pump, and the other end of the connecting tube is communicated with the pump body, one end of the rotating tube is fixedly mounted on the base, and the rotating tube is communicated with the base, and the rotating tube is rotatably mounted on the box body; the two ends of the limiting tube are respectively slidably inserted into the rotating tube and the connecting tube, and extend into the base; the end of the limiting tube close to the rotating tube is closed, and the end close to the connecting tube is open; and a through groove is provided on the side of the limiting tube close to the connecting tube.

4. The plastic electroplating pretreatment equipment according to claim 3, characterized in that: A plurality of through grooves are provided in the circumferential direction of the limiting tube.

5. The plastic electroplating pretreatment equipment according to claim 2, characterized in that: The rotating tube includes: a vertical section, a transverse section and a connecting elbow; the vertical section is arranged parallel to the circumference of the base, and the transverse section is arranged perpendicular to the axis of the base; the spray holes are opened on the vertical section and the transverse section; one end of the vertical section and the transverse section are connected through a connecting elbow; the other end of the vertical section is closed, and the other end of the transverse section is fixedly installed on the base and connected to the base.

6. The plastic electroplating pretreatment equipment according to claim 5, characterized in that: It also includes a driving mechanism: the driving mechanism includes: a bevel gear, a circular slide rail, a slider, a gear ring and a driving gear; one end of the vertical section and the horizontal section can be rotatably mounted on the connecting elbow; and the connecting elbow is slidably mounted in the box body along the circumferential direction of the box body; bevel gears are coaxially fixed on one end of the vertical section and the horizontal section, and the two bevel gears are meshed with each other; the circular slide rail is coaxially fixed on the box body, and a slider is rotatably mounted on the end of the vertical section away from the connecting elbow, and the slider is slidably mounted on the circular slide rail; the gear ring is coaxially and rotatably mounted on the box body, and the driving gear is coaxially fixed on the vertical section, and the driving gear is meshed with the gear ring.

7. The plastic electroplating pretreatment equipment according to claim 1, characterized in that: The liquid injection and discharge mechanism comprises: a liquid suction pump and a liquid discharge pump; the liquid suction pump and the liquid discharge pump are connected with the box body through a pipeline.

8. The plastic electroplating pretreatment equipment according to claim 7, characterized in that: The inner bottom wall of the box body is arranged in the form of a spherical surface which is concave downwards, and the pipeline of the drainage pump is communicated with the lowest end of the inner bottom wall of the box body.

9. The plastic electroplating pretreatment equipment according to claim 1, characterized in that: A heater is also installed in the box.

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