Double-screw piezoelectric injection valve

Abstract

One end of a glue mixing pipe is communicated with a glue outlet of a double-liquid-screw valve, the other end of the glue mixing pipe is connected with a glue dispensing head of the piezoelectric injection valve through a glue guiding block, and a glue guiding runner arranged on the glue guiding block is communicated with the glue outlet of the glue mixing pipe and a glue inlet in the glue dispensing head. A refrigeration body wraps the outer side of the glue mixing pipe, the surface of the side, away from the glue mixing pipe, of the refrigeration body is in contact connection with the refrigeration face of a refrigeration block, a heat conduction shell wraps the outer side of the refrigeration body, and a heat insulation gap is formed between the inner wall of the heat conduction shell arranged at an interval with the refrigeration body and the refrigeration body. The heat conduction shell is in contact connection with at least one heating component. According to the double-component glue dispensing device, mixed double-component glue liquid is sprayed and dispensed, the flowability of the dispensed glue liquid and the glue discharging precision are guaranteed through good refrigeration, meanwhile, the temperature difference between the respective surfaces of the refrigeration block and the heat conduction shell and the surrounding environment is reduced, and the problem that condensate water is generated on the surface of the refrigeration block is solved fundamentally.

Description

Technical Field

[0001] This utility model relates to the field of dispensing technology, and in particular to a twin-screw piezoelectric jet valve. Background Technology

[0002] In industrial production, dispensing is required in many areas, such as integrated circuits, semiconductor packaging, printed circuit boards, color LCD screens, electronic components, and automotive parts. A dispensing valve is a device that enables automated dispensing with high precision. When using a dispensing valve, depending on the characteristics of the products being bonded, two-component adhesives are often required. These two-component adhesives generate heat during mixing, and if the temperature is not lowered, the mixed adhesive will dry quickly. To prevent this drying, a cooling block is often installed at the dispensing point. However, due to temperature differences, condensation easily forms on the cooling block after a period of use, which can severely affect dispensing. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a twin-screw piezoelectric jet valve. While ensuring the fluidity and dispensing accuracy of the adhesive, the twin-screw piezoelectric jet valve reduces the temperature difference between the surface of the cooling block and the heat-conducting shell and their surrounding environment, thus solving the problem of condensation on the surface of the cooling block from the root.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a twin-screw piezoelectric injection valve, comprising: a twin-liquid screw valve with a mixing tube and a piezoelectric injection valve with a dispensing head; one end of the mixing tube is connected to the outlet of the twin-liquid screw valve, and the other end is connected to the dispensing head of the piezoelectric injection valve through a guide block; a guide channel formed on the guide block connects the outlet of the mixing tube and the inlet of the dispensing head; a cooling body is wrapped around the outside of the mixing tube; the surface of the cooling body away from the mixing tube is in contact with the cooling surface of a cooling block; a heat-conducting shell is wrapped around the outside of the cooling body; a heat-insulating gap is formed between the inner wall of the heat-conducting shell, which is spaced apart from the cooling body, and the heat-conducting shell is in contact with at least one heating element.

[0005] The following are further improvements to the above technical solution:

[0006] 1. In the above scheme, a nozzle is installed on the dispensing head outlet, the dispensing head inlet and outlet are connected by a dispensing channel opened in the dispensing head, and the lower end of a movable striking pin is inserted into the dispensing channel and impacts and cooperates with the nozzle.

[0007] 2. In the above scheme, the dual-liquid screw valve and the piezoelectric injection valve are each mounted on a base plate.

[0008] 3. In the above scheme, a second cooling body is disposed close to the outer side of the dispensing head and the dispensing block, and this second cooling body is in contact with and connected to the cooling body.

[0009] 4. In the above scheme, the second refrigeration body is connected to the refrigeration body through mutually embedded grooves and protrusions.

[0010] 5. In the above scheme, the outer side of the second refrigeration body is wrapped with an insulation shell that is spaced apart from the second refrigeration body.

[0011] 6. In the above scheme, the heat insulation gap is filled with heat insulation material.

[0012] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art:

[0013] This utility model relates to a twin-screw piezoelectric jet valve. One end of a mixing tube is connected to the outlet of a dual-liquid screw valve, while the other end is connected to the dispensing head of the piezoelectric jet valve via a guide block. A guide channel on the guide block connects the outlet of the mixing tube to the inlet of the dispensing head. A cooling body is wrapped around the outside of the mixing tube. The surface of the cooling body away from the mixing tube is in contact with the cooling surface of a cooling block. A heat-conducting shell is wrapped around the outside of the cooling body. An insulating gap is formed between the inner wall of the heat-conducting shell and the cooling body. The heat-conducting shell is in contact with at least one heating element. This design enables the jetting and dispensing of the mixed two-component adhesive while ensuring the fluidity and dispensing accuracy of the adhesive through effective cooling. It also reduces the temperature difference between the surfaces of the cooling block and the heat-conducting shell and their surrounding environment, thus fundamentally solving the problem of condensation on the surface of the cooling block. Attached Figure Description

[0014] Appendix Figure 1 This is a front view of the overall structure of the twin-screw piezoelectric injection valve of this utility model;

[0015] Appendix Figure 2 This is a partial structural schematic diagram of the twin-screw piezoelectric injection valve of this utility model from a bottom view.

[0016] Appendix Figure 3 This is a partial structural cross-sectional view of the twin-screw piezoelectric injection valve of this utility model from a bottom-view perspective;

[0017] Appendix Figure 4 This is a partial cross-sectional schematic diagram of the twin-screw piezoelectric injection valve of this utility model;

[0018] Appendix Figure 5 This is a partial cross-sectional front view of the twin-screw piezoelectric injection valve of this utility model.

[0019] In the attached diagrams: 100, mixing tube; 200, dispensing head; 201, glue inlet; 202, glue outlet; 203, nozzle; 204, glue outlet channel; 300, dual-liquid screw valve; 400, piezoelectric jet valve; 401, impact pin; 500, glue guide block; 501, glue guide channel; 700, substrate; 1, cooling body; 2, cooling block; 3, heat-conducting shell; 31, clearance hole; 4, heat insulation gap; 5, heating element; 6, receiving groove; 7, radiator; 8, second cooling body; 91, groove; 92, protrusion; 10, insulation shell. Detailed Implementation

[0020] The present patent can be further understood through the specific embodiments given below, but they are not intended to limit the present patent.

[0021] Example 1: A twin-screw piezoelectric jet valve includes: a dual-liquid screw valve 300 with a mixing tube 100 and a piezoelectric jet valve 400 with a dispensing head 200. One end of the mixing tube 100 is connected to the outlet of the dual-liquid screw valve 300, and the other end is connected to the dispensing head 200 of the piezoelectric jet valve 400 through a guide block 500. A guide channel 501 on the guide block 500 connects the outlet of the mixing tube 100 with the inlet 201 on the dispensing head 200. A cooling body 1 is wrapped around the outside of the mixing tube 100. The surface of the cooling body 1 away from the mixing tube 100 is in contact with the cooling surface of a cooling block 2. When the two-component adhesive flows out from the screw valve into the mixing tube and mixes for dispensing, the cooling body quickly removes the heat inside the mixed adhesive through the cooling block to prevent the adhesive from drying out.

[0022] A heat-conducting shell 3 is wrapped around the outside of the refrigeration body 1. A heat-insulating gap 4 is formed between the inner wall of the heat-conducting shell 3 and the refrigeration body 1, which is spaced apart from the refrigeration body 1. The heat-conducting shell 3 is in contact with at least one heating element 5, which reduces the temperature difference between the surface of the refrigeration block and the heat-conducting shell and its surrounding environment, and solves the problem of condensation on the surface of the refrigeration block from the root.

[0023] A nozzle 203 is installed on the dispensing head 200's outlet 202. The dispensing head 200's inlet 201 and outlet 202 are connected by a dispensing channel 204 opened in the dispensing head 200. The lower end of a movable impact pin 401 is inserted into the dispensing channel 204 and impacts and cooperates with the nozzle 203.

[0024] The aforementioned dual-liquid screw valve 300 and piezoelectric jet valve 400 are each mounted on a base plate 700; a second cooling body 8 is disposed close to the outer side of the aforementioned dispensing head 200 and dispensing block 500, and this second cooling body 8 is in contact with and connected to the cooling body 1.

[0025] The second refrigeration body 8 and the refrigeration body 1 are connected by interlocking grooves 91 and protrusions 92; an insulation shell 10 is provided on the outside of the second refrigeration body 8 at a distance from it.

[0026] The aforementioned refrigeration body 1 has a receiving groove 6 into which a glue supply tube 100 is embedded, and the aforementioned heat-conducting housing 3 has a clearance through hole 31 through which the glue supply tube 100 passes.

[0027] The aforementioned heat insulation gap 4 is filled with heat insulation material; the aforementioned heat insulation material is foamed heat insulation adhesive; the aforementioned heating component 5 is a heating block that contacts the outer surface of the heat-conducting shell 3.

[0028] The aforementioned cooling body 1 is made of copper, and the aforementioned heat-conducting shell 3 is made of aluminum. Aluminum has good thermal conductivity. By actively heating the heat-conducting shell, its surface temperature is not much different from the room temperature. When air comes into contact with the surface of the heat-conducting shell, water molecules will not condense due to excessive temperature difference. In principle, the formation of condensate is avoided, which is more stable and durable than adding a water absorption device.

[0029] Example 2: A twin-screw piezoelectric injection valve includes: a twin-liquid screw valve 300 with a mixing tube 100 and a piezoelectric injection valve 400 with a dispensing head 200. One end of the mixing tube 100 is connected to the outlet of the twin-liquid screw valve 300, and the other end is connected to the dispensing head 200 of the piezoelectric injection valve 400 through a guide block 500. A guide channel 501 on the guide block 500 connects the outlet of the mixing tube 100 with the inlet 201 on the dispensing head 200. A cooling body 1 is wrapped around the outside of the mixing tube 100. The surface of the cooling body 1 away from the mixing tube 100 is in contact with the cooling surface of a cooling block 2. A heat-conducting shell 3 is wrapped around the outside of the cooling body 1. A heat-insulating gap 4 is formed between the inner wall of the heat-conducting shell 3 and the cooling body 1, which is spaced apart from the cooling body 1. The heat-conducting shell 3 is in contact with at least one heating element 5.

[0030] Because prolonged cooling by the cooling block can easily produce condensation, which can affect the quality of the adhesive, a heating element is installed. When the temperature difference between the inside and outside is too large, the heating element will be activated to control the temperature difference and effectively suppress the production of condensation.

[0031] A nozzle 203 is installed on the dispensing head 200's outlet 202. The dispensing head 200's inlet 201 and outlet 202 are connected by a dispensing channel 204 opened in the dispensing head 200. The lower end of a movable impact pin 401 is inserted into the dispensing channel 204 and impacts and cooperates with the nozzle 203.

[0032] The aforementioned dual-liquid screw valve 300 and piezoelectric injection valve 400 are each mounted on a base plate 700.

[0033] The aforementioned heat insulation gap 4 is filled with heat insulation material; the aforementioned heat insulation material is heat insulation cotton.

[0034] The heating element 5 is a heating rod embedded in the heat-conducting housing 3; the heating temperature of the heating element 5 is close to room temperature.

[0035] Both the refrigeration body 1 and the heat-conducting shell 3 are metal bodies with high thermal conductivity; the refrigeration body 1 is a brass body and the heat-conducting shell 3 is a copper shell.

[0036] The heat dissipation surface of the aforementioned cooling block 2, which is composed of at least two stacked semiconductor cooling chips, is connected to a heat sink 7; the aforementioned heat-conducting housing 3 is installed on the heat sink 7. Both the cooling chips and the heat sink are purchased externally and fall within the scope of existing technology, so they will not be described in detail here.

[0037] When the above-mentioned twin-screw piezoelectric jet valve is used, it can spray and dispense the mixed two-component adhesive liquid and ensure the fluidity and dispensing accuracy of the adhesive liquid through good cooling. At the same time, it reduces the temperature difference between the surface of the cooling block and the heat-conducting shell and the surrounding environment, thus solving the problem of condensation on the surface of the cooling block from the root.

[0038] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A twin-screw piezoelectric injection valve, comprising: A dual-liquid screw valve (300) equipped with a mixing tube (100) and a piezoelectric jet valve (400) with a dispensing head (200) are provided. One end of the mixing tube (100) is connected to the outlet of the dual-liquid screw valve (300), and the other end is connected to the dispensing head (200) of the piezoelectric jet valve (400) via a guide block (500). A guide channel (501) formed on the guide block (500) connects the outlet of the mixing tube (100) with the inlet (201) on the dispensing head (200). The feature is that: a cooling body (1) is wrapped around the outside of the mixing tube (100), and the surface of the cooling body (1) away from the mixing tube (100) is in contact with the cooling surface of a cooling block (2). A heat-conducting shell (3) is wrapped around the outside of the cooling body (1), and a heat-insulating gap (4) is formed between the inner wall of the heat-conducting shell (3) and the cooling body (1) at intervals. The heat-conducting shell (3) is in contact with at least one heating element (5).

2. The twin-screw piezoelectric injection valve according to claim 1, characterized in that: A nozzle (203) is installed on the outlet (202) of the dispensing head (200). The inlet (201) and outlet (202) of the dispensing head (200) are connected by a dispensing channel (204) opened in the dispensing head (200). The lower end of a movable impact pin (401) is inserted into the dispensing channel (204) and impacts and cooperates with the nozzle (203).

3. The twin-screw piezoelectric injection valve according to claim 1, characterized in that: The dual-liquid screw valve (300) and the piezoelectric injection valve (400) are each mounted on a base plate (700).

4. The twin-screw piezoelectric injection valve according to claim 1, characterized in that: A second cooling body (8) is disposed close to the outer side of the dispensing head (200) and the dispensing block (500), and this second cooling body (8) is in contact with the cooling body (1).

5. The twin-screw piezoelectric injection valve according to claim 4, characterized in that: The second refrigeration body (8) and the refrigeration body (1) are connected by interlocking grooves (91) and protrusions (92).

6. The twin-screw piezoelectric injection valve according to claim 5, characterized in that: The outer side of the second refrigeration body (8) is covered with an insulation shell (10) spaced apart from the second refrigeration body (8).

7. The twin-screw piezoelectric injection valve according to claim 1, characterized in that: The insulation gap (4) is filled with insulation material.

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