A cleaning device for injection molds

Abstract

The utility model discloses a kind of cleaning devices of injection mold, including bottom plate, the upper surface of bottom plate is fixed with cleaning tank and controller, the top of cleaning tank is provided with liftable sealing cover, the inner bottom wall of cleaning tank is fixed with perforated plate by multiple support rods, the surface of bottom plate and the inside of cleaning tank are jointly installed with ultrasonic assembly, the top end and bottom end of cleaning tank side wall are respectively fixed with liquid inlet pipe and drain pipe, the upper surface of sealing cover is installed with hot air assembly and negative pressure assembly;The utility model is through integrated negative pressure pretreatment and ultrasonic cleaning, when cleaning operation starts, negative pressure assembly first carries out vacuumizing treatment to the inside of closed cleaning tank, forms negative pressure environment in the deep cavity of mould, fine hole and gap;Subsequently, cleaning fluid is quickly sucked in and fully fills all above micro gap under the action of pressure difference by liquid inlet pipe, realizes the mandatory infiltration to traditional cleaning blind area.

Description

Technical Field

[0001] This utility model relates to the field of mold cleaning technology, and in particular to a cleaning device for injection molds. Background Technology

[0002] Regular and thorough cleaning of plastic cup injection molds is a crucial maintenance process for ensuring product quality and extending mold life. During use, stubborn contaminants such as plastic decomposition products, mold release agents, grease, and carbon deposits can accumulate inside the mold's complex structure, including cavities, runners, ejector pin holes, and venting grooves. Incomplete cleaning can not only affect the product's appearance and dimensional accuracy but may also cause mold corrosion or damage. Therefore, developing efficient cleaning equipment is of great significance for precision injection molding production.

[0003] Currently, most existing injection mold cleaning devices employ a combination of physical rinsing and immersion. For example, patent CN223250159U describes a cleaning device for injection mold production. Its working principle involves immersing the mold in a cleaning solution and driving it to rotate, supplemented by low-pressure spraying. This design aims to remove surface contaminants through the relative motion of water flow, avoiding complete reliance on manual cleaning and achieving preliminary automation.

[0004] However, the aforementioned mold cleaning devices have the following drawbacks: First, the cleaning power is insufficient, resulting in poor cleaning effects on stubborn stains and complex structures. Relying solely on the rotation of the mold in still water and low-pressure spraying generates weak fluid shear force, making it difficult to effectively remove firmly attached oil stains, mold release agent residues, and plastic pyrolysis carbon deposits. Second, the cleaning ability for internal dead corners of the mold is poor; for internal structures such as deep and narrow cavities, tiny ejector pin holes, slender venting channels, and screw holes, still water immersion cannot generate directional flushing force, and external spraying is also physically blocked, making it impossible to reach these critical areas. This results in stains remaining unremoved, becoming cleaning blind spots that directly affect the cleanliness and subsequent performance of the mold. Therefore, further improvements are needed. To this end, we propose a cleaning device for injection molds. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a cleaning device for injection molds.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a cleaning device for injection molds, comprising a base plate, a cleaning tank and a controller fixed on the upper surface of the base plate, a liftable sealing cover provided on the top of the cleaning tank, a perforated plate fixed to the bottom wall of the cleaning tank by multiple support rods, an ultrasonic component installed on the surface of the base plate and inside the cleaning tank, an inlet pipe and an outlet pipe fixed at the top and bottom of the side wall of the cleaning tank respectively, and a hot air component and a negative pressure component installed on the upper surface of the sealing cover.

[0007] Furthermore, hydraulic telescopic rods are fixed on the upper surface of the base plate and on both sides of the cleaning tank, and the telescopic ends of the two hydraulic telescopic rods are fixedly connected to the lower surface of the sealing cover.

[0008] Furthermore, the negative pressure assembly includes a negative pressure pump fixed to the upper surface of the sealing cover. The air inlet of the negative pressure pump and the sealing cover are fixedly connected by an air extraction pipe, and the air extraction pipe extends through the sealing cover to the bottom of the sealing cover. A second valve is fixed in the middle of the air extraction pipe.

[0009] Furthermore, a third valve is fixedly installed in the middle of both the inlet pipe and the outlet pipe.

[0010] Furthermore, a liquid level sensor is fixed to the top of the inner wall of the cleaning tank, and both the third valve and the liquid level sensor are electrically connected to the controller.

[0011] Furthermore, the ultrasonic component includes an ultrasonic generator fixed to the surface of the base plate and an ultrasonic transducer fixed to the bottom wall of the cleaning tank, and the ultrasonic generator and the ultrasonic transducer are electrically connected.

[0012] Furthermore, the hot air assembly includes an air pump fixed to the upper surface of the sealing cover, an air supply pipe fixed to the air outlet of the air pump, the other end of the air supply pipe passing through the sealing cover and fixed to a ring pipe, a plurality of air outlets fixed to the lower surface of the ring pipe, a heating pipe and a first valve fixed to one end of the air supply pipe near the air pump, and an electric heating wire fixedly installed inside the heating pipe.

[0013] The beneficial effects of this utility model are:

[0014] This invention integrates negative pressure pretreatment and ultrasonic cleaning. Upon startup, the negative pressure component first creates a vacuum inside the sealed cleaning tank, forming a negative pressure environment in the deep cavities, fine pores, and crevices of the mold. Subsequently, the cleaning fluid is rapidly drawn in through the inlet pipe under pressure differential, fully filling all the aforementioned microscopic pores, achieving forced wetting of traditional cleaning blind spots. Based on this physical wetting, the ultrasonic component is activated, and its transducer generates a strong cavitation effect in the cleaning fluid, producing countless tiny bubbles on the inner and outer surfaces of the mold and within the already wetted pores, which then instantly collapse. The resulting high-energy micro-jet powerfully impacts and peels off stubborn stains adhering to various locations. This process combines the deep penetration driven by negative pressure with the microscopic peeling effect of ultrasonic cavitation, thus achieving comprehensive and thorough cleaning of injection molds from macroscopic cavities to microscopic dead corners. Attached Figure Description

[0015] To more clearly illustrate the technical solution of this utility model, the drawings used in the description of the specific embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is an overall sectional view of the present invention;

[0017] Figure 2 This is a partial perspective view of the present invention;

[0018] Figure 3 This is a schematic diagram of the annular tube of this utility model.

[0019] The attached figures are labeled as follows:

[0020] 1. Base plate; 2. Cleaning tank; 3. Sealing cover; 4. Orifice plate; 5. Ultrasonic assembly; 51. Ultrasonic generator; 52. Ultrasonic transducer; 6. Liquid inlet pipe; 7. Liquid outlet pipe; 8. Hot air assembly; 81. Air pump; 82. Air supply pipe; 83. Ring pipe; 84. Air outlet; 85. Heating tube; 86. First valve; 9. Negative pressure assembly; 91. Negative pressure pump; 92. Air extraction pipe; 93. Second valve; 10. Third valve; 11. Hydraulic telescopic rod; 12. Liquid level sensor; 13. Controller. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0022] like Figures 1-3 As shown, a cleaning device for injection molds is disclosed, including a base plate 1, a cleaning tank 2 and a controller 13 fixed on the upper surface of the base plate 1. The controller 13 adopts an existing PLC controller, specifically the SIMATIC KP1200 series controller with screen (HMI+PLC integrated machine).

[0023] The top of the cleaning tank 2 is equipped with a liftable sealing cover 3. The bottom wall of the cleaning tank 2 is fixed with a perforated plate 4 by multiple support rods. The perforated plate 4 can support the mold. During cleaning, the mold can be placed on the surface of the perforated plate 4. The surface of the bottom plate 1 and the inside of the cleaning tank 2 are equipped with an ultrasonic component 5. The top and bottom of the side wall of the cleaning tank 2 are respectively fixed with an inlet pipe 6 and a drain pipe 7. The upper surface of the sealing cover 3 is equipped with a hot air component 8 and a negative pressure component 9.

[0024] Hydraulic telescopic rods 11 are fixed on the upper surface of the base plate 1 and on both sides of the cleaning tank 2. The telescopic ends of the two hydraulic telescopic rods 11 are fixedly connected to the lower surface of the sealing cover 3.

[0025] In this embodiment, a hydraulic station is also provided to match the hydraulic telescopic rod 11. The hydraulic station and the hydraulic telescopic rod 11 form a hydraulic system. This system is electrically connected to the controller 13. The controller 13 controls the extension and retraction of the hydraulic telescopic rod 11. The hydraulic telescopic rod 11 can drive the sealing cover 3 to rise and fall. When the sealing cover 3 falls and covers the top of the cleaning tank 2, the inside of the cleaning tank 2 is sealed. A sealing strip is provided at the contact position between the lower surface of the sealing cover 3 and the cleaning tank 2.

[0026] The negative pressure assembly 9 includes a negative pressure pump 91 fixed to the upper surface of the sealing cover 3. The suction port of the negative pressure pump 91 and the sealing cover 3 are fixedly connected by a suction pipe 92, and the suction pipe 92 extends through the sealing cover 3 to the bottom of the sealing cover 3. A second valve 93 is fixed in the middle of the suction pipe 92.

[0027] The second valve 93 is a solenoid valve. A pressure gauge is also installed above the sealing cover 3. The pressure gauge, the second valve 93, and the negative pressure pump 91 are all electrically connected to the controller 13. After the negative pressure pump 91 is started by the controller 13, negative pressure can be drawn into the sealed cleaning tank 2 through the air extraction pipe 92. When the pressure gauge detects that the negative pressure reaches the preset value of the controller 13, the controller 13 controls the negative pressure pump 91 to stop and closes the second valve 93.

[0028] A third valve 10 is fixedly installed in the middle of both the inlet pipe 6 and the outlet pipe 7.

[0029] The third valve 10 is a solenoid valve and is electrically connected to the controller 13. The inlet pipe 6 is connected to the cleaning fluid storage tank or water pipe. After the negative pressure is drawn out inside the cleaning tank 2, the controller 13 controls the third valve 10 on the inlet pipe 6 to open, and the cleaning fluid or water enters the cleaning tank 2 along the inlet pipe 6.

[0030] A liquid level sensor 12 is fixed to the top of the inner wall of the cleaning tank 2. The third valve 10 and the liquid level sensor 12 are both electrically connected to the controller 13.

[0031] The liquid level sensor 12 is a water immersion sensor that can detect the liquid level inside the cleaning tank 2. When cleaning fluid is added into the cleaning tank 2 through the liquid inlet pipe 6 and reaches the position of the liquid level sensor 12, the information is fed back to the controller 13, and the controller 13 controls the third valve 10 on the liquid inlet pipe 6 to close.

[0032] The ultrasonic component 5 includes an ultrasonic generator 51 fixed to the surface of the base plate 1 and an ultrasonic transducer 52 fixed to the bottom wall of the cleaning tank 2, and the ultrasonic generator 51 and the ultrasonic transducer 52 are electrically connected.

[0033] The ultrasonic component 5 uses existing technology. After the cleaning fluid is added, the switch on the ultrasonic generator 51 is turned on manually. The ultrasonic transducer 52 generates cavitation to clean the mold.

[0034] A pressure balancing solenoid valve is also fixedly installed on the sealing cover 3. After each cleaning, the controller 13 first opens the pressure balancing solenoid valve to balance the pressure inside and outside the cleaning tank 2, and then controls the third valve 10 on the drain pipe 7 to open and discharge the cleaning liquid; then the next round of cleaning can be carried out.

[0035] The hot air assembly 8 includes an air pump 81 fixed to the upper surface of the sealing cover 3. An air supply pipe 82 is fixed to the air outlet of the air pump 81. The other end of the air supply pipe 82 passes through the sealing cover 3 and is fixed to a ring pipe 83. Several air outlets 84 are fixed to the lower surface of the ring pipe 83. A heating pipe 85 and a first valve 86 are fixed to one end of the air supply pipe 82 near the air pump 81. An electric heating wire is fixedly installed inside the heating pipe 85. The hot air assembly 8 is electrically connected to the controller 13.

[0036] After multiple rounds of cleaning are completed and the air pressure inside and outside the cleaning tank 2 is balanced, the controller 13 controls the hydraulic telescopic rod 11 to extend, causing the sealing cover 3 to move up 1cm. Then, the air pump 81 is started, the first valve 86 is opened, and the electric heating wire is started. The air blown out by the air pump 81 is heated by the electric heating wire and enters the ring pipe 83. Finally, it is blown onto the mold from several air outlets 84 to achieve hot air drying. After it is completely dried, the controller 13 controls the hydraulic telescopic rod 11 to continue to extend, causing the sealing cover 3 to move up to the highest position. Finally, the mold can be removed.

[0037] In this embodiment, the electrical connections and control methods between the controller 13 and each electrical component are all existing technologies and will not be described in detail here.

[0038] Working principle: The operator places the injection mold to be cleaned on the upper surface of the perforated plate 4 in the cleaning tank 2, and then controls the two hydraulic telescopic rods 11 to retract synchronously through the controller 13, which drives the sealing cover 3 to descend and press against the top of the cleaning tank 2 to form a sealed cavity.

[0039] Next, the controller 13 starts the negative pressure pump 91 of the negative pressure component 9 and opens the second valve 93 to evacuate the sealed cleaning tank 2 through the air extraction pipe 92; when the pressure gauge detects that the internal pressure reaches the negative pressure value preset by the controller 13, the controller 13 shuts off the negative pressure pump 91 and the second valve 93.

[0040] Subsequently, the controller 13 opens the third valve 10 on the inlet pipe 6. Under the pressure difference between the external atmospheric pressure and the internal negative pressure, the cleaning fluid is quickly injected into the cleaning tank 2 through the inlet pipe 6. When the liquid level rises to the position of the liquid level sensor 12 fixed at the top of the inner wall of the cleaning tank 2, the liquid level sensor 12 feeds back the signal to the controller 13, and the controller 13 then closes the third valve 10 to stop the liquid inlet.

[0041] At this point, the operator manually activates the ultrasonic generator 51 of the ultrasonic component 5, driving the ultrasonic transducer 52 fixed to the bottom wall of the cleaning tank 2 to operate, generating a cavitation effect in the cleaning fluid to deeply clean the mold. After cleaning, the controller 13 first opens the balancing pressure solenoid valve on the sealing cover 3 to balance the pressure inside and outside the cleaning tank 2, and then opens the third valve 10 on the drain pipe 7 to discharge the waste liquid. This cleaning process can be repeated multiple times.

[0042] After complete cleaning, controller 13 controls the hydraulic telescopic rod 11 to slightly raise the sealing cover 3 by about 1 cm, creating an air outlet gap. Then, the hot air assembly 8 is activated, the first valve 86 is opened, and the air pump 81 and the electric heating wire in the heating tube 85 are started. The generated hot air is delivered to the ring pipe 83 via the air supply pipe 82, and finally blown onto the mold from several air outlets 84 for drying. After drying, controller 13 controls the hydraulic telescopic rod 11 to extend fully, raising the sealing cover 3 to its highest position, allowing the operator to remove the cleaned and dried mold.

[0043] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to any specific implementation. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A cleaning device for injection molds, comprising a base plate (1), characterized in that: The cleaning tank (2) and controller (13) are fixed on the upper surface of the base plate (1). The top of the cleaning tank (2) is provided with a liftable sealing cover (3). The bottom wall of the cleaning tank (2) is fixed with a perforated plate (4) by multiple support rods. An ultrasonic component (5) is installed on the surface of the base plate (1) and inside the cleaning tank (2). The top and bottom of the side wall of the cleaning tank (2) are respectively fixed with an inlet pipe (6) and a drain pipe (7). A hot air component (8) and a negative pressure component (9) are installed on the upper surface of the sealing cover (3).

2. The cleaning device for injection molds according to claim 1, characterized in that: Hydraulic telescopic rods (11) are fixed on the upper surface of the base plate (1) and on both sides of the cleaning tank (2). The telescopic ends of the two hydraulic telescopic rods (11) are fixedly connected to the lower surface of the sealing cover (3).

3. The cleaning device for injection molds according to claim 1, characterized in that: The negative pressure assembly (9) includes a negative pressure pump (91) fixed to the upper surface of the sealing cover (3). The air inlet of the negative pressure pump (91) and the sealing cover (3) are fixedly connected to an air extraction pipe (92), and the air extraction pipe (92) extends through the sealing cover (3) to the bottom of the sealing cover (3). A second valve (93) is fixed in the middle of the air extraction pipe (92).

4. The cleaning device for injection molds according to claim 1, characterized in that: A third valve (10) is fixedly installed in the middle of both the inlet pipe (6) and the outlet pipe (7).

5. The cleaning device for injection molds according to claim 4, characterized in that: A liquid level sensor (12) is fixed on the top of the inner wall of the cleaning tank (2), and the third valve (10) and the liquid level sensor (12) are both electrically connected to the controller (13).

6. The cleaning device for injection molds according to claim 1, characterized in that: The ultrasonic component (5) includes an ultrasonic generator (51) fixed to the surface of the base plate (1) and an ultrasonic transducer (52) fixed to the bottom wall of the cleaning tank (2), and the ultrasonic generator (51) and the ultrasonic transducer (52) are electrically connected.

7. The cleaning device for injection molds according to claim 1, characterized in that: The hot air assembly (8) includes an air pump (81) fixed to the upper surface of the sealing cover (3). An air supply pipe (82) is fixed to the air outlet of the air pump (81). The other end of the air supply pipe (82) passes through the sealing cover (3) and is fixed with a ring pipe (83). Several air outlets (84) are fixed to the lower surface of the ring pipe (83). A heating pipe (85) and a first valve (86) are fixed to one end of the air supply pipe (82) near the air pump (81). An electric heating wire is fixedly installed inside the heating pipe (85).

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