Micro-quantitative glue injection process

Abstract

The invention relates to a micro-quantitative glue injection process which solves the technical problems that in the prior art, cost is high, cleaning is difficult, and a high-viscosity adhesive is not suitable. The invention designs a special micro-quantitative glue injection device which comprises a glue injection barrel and a glue injection push rod penetrating into the glue injection barrel, a glue filling exhaust hole is formed in the end part, close to one end connected with the glue injection push rod, of the glue injection barrel; the glue injection cylinder is made of transparent high polymer materials, and scales are arranged on the outer wall of the glue injection cylinder. The device is low in cost and high in adaptability, and cannot chemically react with common optical cement; and meanwhile, due to low cost, the device can be used as a disposable glue injection tool, then a glue injection process is designed, the problems of high cost and difficulty in cleaning are solved, the operation is convenient, and pollution-free glue injection of the adhesive is ensured.

Description

Technical Field

[0001] The invention relates to a bonding support technology in optical precision mechanical engineering, and in particular to a micro-quantitative glue injection process. Background Art

[0002] The adhesive support method is widely used in optical instruments because it does not require additional connectors and has the advantages of simple and compact connection system structure, uniform stress distribution, and good temperature adaptability. In the design process of optical instruments, the support structure of reflectors and lenses has always been the focus and difficulty of structural design. Most of the structural adhesives used shrink during curing, and the shrinkage of the structural adhesive and the change of mechanical properties will cause internal stress, which will cause deformation of the optical surface, which directly affects the surface shape and position accuracy of the optical instrument mirror, and then affects the imaging quality of the whole machine.

[0003] In order to reduce the adverse effects of shrinkage of structural adhesive during curing on the surface shape of optical components, the following principles should be followed during gluing: while ensuring the bonding strength, reduce the bonding area as much as possible, and keep the bonding area as far away from the mirror as possible. Discontinuous adhesive rings or spots should be evenly arranged around the circumference, and try to ensure the consistency of the size and thickness of the adhesive rings or spots.

[0004] During the assembly stage, due to the particularity and complexity of the bonding process, it not only directly affects the initial assembly performance of the product, but also affects the retention of the assembly performance. Therefore, strict control of the bonding process and continuous optimization of the process methods are required, which has a significant impact on the guarantee and improvement of the bonding assembly performance.

[0005] The existing injection tool is an integrated micro-injector, such as Figure 1 As shown, the barrel of the micro-injector is made of glass, and the needle diameter is Φ (0.1-0.5) mm. This type of micro-injector is expensive, and when it is reused, the residual adhesive in the barrel is not easy to clean; in addition, due to the relatively small diameter of the integrated needle, the micro-injector is only suitable for the injection operation of low-viscosity adhesives, and is not suitable for high-viscosity adhesives that also require high-precision injection. Usually, other non-standard tools are needed for injection, and it is difficult to control the injection quality. Summary of the invention

[0006] The purpose of the present invention is to solve the technical problems of the prior art that the cost is high, the cleaning is difficult, and the adhesive with high viscosity is not applicable, and to provide a micro-quantitative glue injection process.

[0007] In order to achieve the above purpose, the technical solution provided by the present invention is as follows:

[0008] A micro-quantitative glue injection process, which is special in that it includes the following steps:

[0009] S1, prepare a micro-quantitative glue injection device according to the needs of glue injection;

[0010] The micro quantitative glue injection device comprises a glue injection cylinder and a glue injection push rod;

[0011] A glue injection cavity is provided inside the glue injection cylinder; a glue injection push rod can be movably inserted into the glue injection cavity from one end of the glue injection cylinder, and the length of the glue injection push rod is greater than that of the glue injection cylinder; a push rod piston is provided at one end of the glue injection push rod located in the glue injection cavity, and the outer diameter of the push rod piston is adapted to the inner diameter of the glue injection cavity; a glue injection exhaust hole that passes through inside and outside is provided at the end position of the glue injection cylinder near the end connected to one end of the glue injection push rod; an external thread is provided on the outer periphery of the other end of the glue injection cylinder, which is used to cooperate with the glue injection threaded hole of the optical instrument to be injected with glue to form a seal;

[0012] The injection tube is made of transparent polymer material, and there are scales on its outer wall;

[0013] S2, processing the injection hole at the injection position of the optical instrument to be injected with glue into a glue injection threaded hole;

[0014] S3, glue preparation and bubble removal

[0015] Prepare adhesive according to the adhesive ratio requirements to obtain adhesive and eliminate bubbles in the adhesive liquid;

[0016] S4, glue injection tube filling

[0017] Use a syringe with a glue injection needle to inject the glue after eliminating bubbles into the glue injection cavity until the glue injection cavity is filled with the glue; the injection direction is: inject from the other end of the glue injection tube to one end; the filling standard is: until the adhesive is in a critical state of seeping out from the glue injection vent hole;

[0018] The injection needle should be smaller than the injection cavity and can smoothly inject the adhesive into the injection cavity;

[0019] S5, injection volume calculation

[0020] Calculate the amount of adhesive to be injected based on the required glue spot parameters and the size of the injection threaded hole of the optical instrument to be injected;

[0021] S6, glue injection

[0022] Screw the external thread into the injection threaded hole of the optical instrument to be injected and tighten it, push the injection push rod to inject the adhesive into the injection threaded hole, and observe the scale of the injection cylinder;

[0023] After the glue injection amount obtained in step S5 is pushed in, the glue injection of the glue injection threaded hole is completed; at this time, the external thread is unscrewed out of the glue injection threaded hole where the glue injection has been completed, and the micro quantitative glue injection device can be disassembled;

[0024] S7, return to step S5, calculate the amount of glue required for the next glue injection threaded hole to be injected, and determine whether the remaining adhesive in the injection cavity of the micro-quantitative glue injection device can meet the injection amount. If so, continue to step S6; if not, discard the micro-quantitative glue injection device, replace it with a new micro-quantitative glue injection device, and return to step S4; until all glue injection threaded holes are completed.

[0025] Furthermore, in step S1, a limiting boss is provided on the outer wall of the glue injection cylinder at a position on one side of the external thread close to the glue injection exhaust hole, for cooperating and abutting with the outer periphery of the glue injection threaded hole of the optical instrument to be injected with glue.

[0026] Furthermore, in step S1, the minimum precision of the scale is 1 μl.

[0027] Furthermore, in step S1, there are two glue injection exhaust holes, which are symmetrically arranged along the outer wall of the glue injection cylinder.

[0028] Furthermore, in step S1, the outer diameter of the injection push rod is smaller than the outer diameter of the push rod piston; a push handle is provided at the other end of the injection push rod; and a support plate is provided at the outer periphery of one end of the injection cylinder.

[0029] Furthermore, in step S1, the inner diameter of the glue injection cavity is 0.5-2 mm; and the diameter of the glue injection vent hole is 0.2-0.4 mm.

[0030] Furthermore, in step S1, the glue injection cylinder and the glue injection push rod are both made of high molecular weight polypropylene material.

[0031] Furthermore, in step S3, the method for eliminating bubbles in the adhesive is to let the prepared adhesive stand and wait for the bubbles to disappear by themselves, or to use a degassing device to eliminate the bubbles.

[0032] The beneficial effects of the present invention compared with the prior art are as follows:

[0033] 1. The present invention provides a micro-quantitative glue injection process, designs a special micro-quantitative glue injection device, and is made of high molecular weight polypropylene material. It has low cost, strong adaptability, and will not chemically react with commonly used optical glue. Also due to its low cost, the device can be used as a disposable glue injection tool, which solves the problems of high cost and difficult cleaning, is easy to operate, and ensures pollution-free injection of adhesives.

[0034] 2. The present invention provides a micro-quantitative glue injection process, in which the glue injection device is made of high molecular weight polypropylene material. The glue injection tube has high transparency and clear and accurate scale lines (with a minimum accuracy of 1 ul) are printed on the tube, which can achieve accurate micro-quantitative glue injection of high-viscosity adhesives. In addition, the glue pouring and injection process is visualized, and it can be intuitively seen whether the glue liquid of the adhesive contains bubbles, which can effectively avoid the influence of uneliminated bubbles.

[0035] 3. The present invention provides a micro-quantitative glue injection process, which processes the original glue injection hole into a glue injection threaded hole. The glue injection device used is designed with an external thread at the glue injection position that matches the instrument glue injection threaded hole, that is, the two are connected by threaded matching, which maintains stability during the glue injection process and can prevent glue overflow.

[0036] 4. The micro-quantitative glue injection process provided by the present invention has simple steps, easy operation, and strong versatility and feasibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic diagram of the structure of an existing micro-injector;

[0038] Figure 2 It is a principle diagram of an embodiment of a micro-quantitative glue injection process of the present invention;

[0039] Figure 3 It is a schematic diagram of the structure of the micro-quantitative glue injection device used in the embodiment of the present invention.

[0040] The following are the descriptions of the figures:

[0041] 1-glue injection cylinder, 101-glue injection cavity, 102-glue injection exhaust hole, 103-external thread, 104-limiting boss, 105-support plate; 2-glue injection push rod, 201-push rod piston, 202-push handle. DETAILED DESCRIPTION

[0042] The specific technical solutions in the embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0043] Since the existing micro-syringes have a limited scope of application and are expensive, a high-precision glue injection device is required during the glue injection process to control the adhesive parameters by accurately controlling the glue injection amount.

[0044] The present invention can strictly control the amount of glue injection through precise scales and transparent cylinder visual monitoring, thereby ensuring the consistency requirement of glue spot size during the bonding process of optical elements. In addition, the device used can remove bubbles in the adhesive as needed during use and has strong adaptability to different types of adhesives.

[0045] like Figure 2As shown, the embodiment of the present invention provides a micro-quantitative glue injection process, which specifically includes the following steps:

[0046] S1, device pre-preparation

[0047] According to the needs of glue injection, prepare a micro-quantitative glue injection device.

[0048] Figure 3 The micro-quantitative glue injection device used in the embodiment of the present invention comprises a glue injection cylinder 1 and a glue injection push rod 2. The glue injection cylinder 1 is provided with a glue injection cavity 101 inside, and the glue injection push rod 2 can be movably inserted into the glue injection cavity 101 from one end of the glue injection cylinder 1. The inner diameter of the glue injection cavity 101 is 0.5-2 mm.

[0049] The glue injection cylinder 1 and the glue injection push rod 2 are made of high molecular weight polypropylene, which is low in cost and has good transparency and adaptability.

[0050] The length of the injection push rod 2 is greater than that of the injection cylinder 1. A push rod piston 201 is provided at one end of the injection push rod 2 located in the injection cavity 101, and the outer diameter of the push rod piston 201 is adapted to the inner diameter of the injection cavity 101; the outer diameter of the injection push rod 2 is smaller than the outer diameter of the push rod piston 201.

[0051] The glue injection cylinder 1 is provided with two glue injection exhaust holes 102 which are connected inside and outside and connected to one end of the glue injection push rod 2, which are used to exhaust air during glue injection to avoid glue injection difficulties caused by its narrow cavity; the diameter of the glue injection exhaust holes 102 is 0.2~0.4mm; the two glue injection exhaust holes 102 are symmetrically arranged along the outer wall of the glue injection cylinder 1.

[0052] The other end of the glue injection tube 1 is provided with an external thread 103, which is used to cooperate with the glue injection threaded hole of the optical instrument to form a seal to prevent glue overflow during glue injection, and the purpose is also to accurately control the amount of glue injection.

[0053] The outer wall of the glue injection cylinder 1 is provided with a scale, and the minimum precision of the scale is 1 μl, so that the amount of glue injection can be accurately controlled.

[0054] On the outer wall of the glue injection cylinder 1, a limiting boss 104 is provided at one side of the external thread 103 close to the glue injection exhaust hole 102, for cooperating and abutting with the outer periphery of the glue injection thread hole of the optical instrument.

[0055] A push handle 202 is disposed at the other end of the glue injection push rod 2; a support plate 105 is disposed at the outer periphery of one end of the glue injection cylinder 1 for the operator to hold and facilitate glue injection.

[0056] S2, threaded hole machining

[0057] The injection hole at the injection position of the optical instrument to be injected with glue is processed into a glue injection threaded hole.

[0058] S3, glue preparation and bubble removal

[0059] The adhesive is prepared according to the adhesive ratio requirements to obtain the adhesive and eliminate the bubbles in the adhesive liquid.

[0060] The method to eliminate bubbles in the adhesive is to let the prepared adhesive stand and wait for the bubbles to disappear by themselves, or use a defoaming device to eliminate the bubbles. Other common defoaming methods can also be used.

[0061] The amount of adhesive prepared should meet the total amount of glue injection required.

[0062] S4, glue injection tube filling

[0063] Use a syringe with a glue injection needle to inject the glue after eliminating bubbles into the glue injection cavity 101 until the glue injection cavity 101 is filled with the glue; the injection direction is: inject from the other end of the glue injection cylinder 1 to one end; the filling standard is: until the adhesive is in a critical state of seeping out from the glue injection exhaust hole 102;

[0064] The glue injection needle is selected to have a size smaller than the glue injection cavity 101 and capable of smoothly injecting the adhesive into the glue injection cavity 101;

[0065] S5, injection volume calculation

[0066] Calculate the amount of adhesive to be injected based on the required glue spot parameters and the size of the injection threaded hole of the optical instrument to be injected;

[0067] S6, glue injection

[0068] Screw the external thread 103 into the injection threaded hole of the optical instrument to be injected with glue and tighten it, push the injection push rod 2 to inject the adhesive into the injection threaded hole, and observe the scale of the injection cylinder 1;

[0069] After the glue injection amount obtained in step S5 is pushed in, the glue injection of the glue injection threaded hole is completed; at this time, the external thread 103 is unscrewed out of the glue injection threaded hole where the glue injection has been completed, and the micro quantitative glue injection device can be disassembled;

[0070] S7, return to step S5, calculate the glue injection amount required for the next glue injection threaded hole to be injected, and determine whether the remaining adhesive in the glue injection cavity 101 of the micro-quantitative glue injection device can meet the glue injection amount:

[0071] If yes, continue to step S6;

[0072] If not, the micro-quantitative glue injection device is discarded, replaced with a new micro-quantitative glue injection device, and the process returns to step S4 until all the glue injection threaded holes are fully injected.

[0073] The above content is only an embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings, or directly or indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A micro-quantitative glue injection process, characterized in that: The following steps are involved: S1, prepare a micro-quantitative glue injection device according to the needs of glue injection; The micro-quantitative glue injection device comprises a glue injection cylinder (1) and a glue injection push rod (2); The glue injection cylinder (1) is provided with a glue injection cavity (101) inside; the glue injection push rod (2) can be movably inserted into the glue injection cavity (101) from one end of the glue injection cylinder (1), and the length of the glue injection push rod (2) is greater than that of the glue injection cylinder (1); a push rod piston (201) is provided at one end of the glue injection push rod (2) located in the glue injection cavity (101), and the outer diameter of the push rod piston (201) is adapted to the inner diameter of the glue injection cavity (101); the glue injection cylinder (1) is provided with a glue injection exhaust hole (102) that penetrates inside and outside at an end position close to the end connected to one end of the glue injection push rod (2); the outer periphery of the other end of the glue injection cylinder (1) is provided with an external thread (103) for cooperating with the glue injection thread hole of the optical instrument to be injected with glue to form a seal; The glue injection cylinder (1) is made of a transparent polymer material, and a scale is provided on its outer wall; S2, processing the injection hole at the injection position of the optical instrument to be injected with glue into a glue injection threaded hole; S3, glue preparation and bubble removal Prepare adhesive according to the adhesive ratio requirements to obtain adhesive and eliminate bubbles in the adhesive liquid; S4, glue injection tube filling Using a syringe with a glue injection needle, the glue after eliminating bubbles is poured into the glue injection cavity (101) until the glue injection cavity (101) is filled with the glue; the direction of pouring is: pouring from the other end of the glue injection cylinder (1) toward one end; the filling standard is: until the adhesive is in a critical state of seeping out from the glue injection exhaust hole (102); The glue injection needle is selected to have a size smaller than the glue injection cavity (101) and capable of smoothly injecting the adhesive into the glue injection cavity (101); S5, injection volume calculation Calculate the amount of adhesive to be injected based on the required glue spot parameters and the size of the injection threaded hole of the optical instrument to be injected; S6, glue injection The external thread (103) is screwed into the injection threaded hole of the optical instrument to be injected with glue and tightened, the injection push rod (2) is pushed to inject the adhesive into the injection threaded hole, and the scale of the injection cylinder (1) is observed; After the glue injection amount obtained in step S5 is pushed in, the glue injection of the glue injection threaded hole is completed; at this time, the external thread (103) is screwed out of the glue injection threaded hole where the glue injection has been completed, and the micro quantitative glue injection device can be disassembled; S7, return to step S5, calculate the amount of glue required for the next glue injection threaded hole to be injected, and determine whether the remaining adhesive in the injection cavity (101) of the micro-quantitative glue injection device can meet the injection amount. If so, continue to step S6; if not, discard the micro-quantitative glue injection device, replace it with a new micro-quantitative glue injection device, and return to step S4; until all glue injection threaded holes are injected.

2. A micro-quantitative glue injection process according to claim 1, characterized in that: In step S1, a limiting boss (104) is provided on the outer wall of the glue injection cylinder (1) at a position on one side of the external thread (103) close to the glue injection exhaust hole (102), for cooperating and abutting with the outer periphery of the glue injection thread hole of the optical instrument to be injected with glue.

3. A micro-quantitative glue injection process according to claim 1, characterized in that: In step S1, the minimum precision of the scale is 1 μl.

4. A micro-quantitative glue injection process according to claim 1, characterized in that: In step S1, there are two glue injection exhaust holes (102), which are symmetrically arranged along the outer wall of the glue injection cylinder (1).

5. A micro-quantitative glue injection process according to any one of claims 1 to 4, characterized in that: In step S1, the outer diameter of the injection push rod (2) is smaller than the outer diameter of the push rod piston (201); the other end of the injection push rod (2) is provided with a push handle (202); and a support plate (105) is provided on the outer periphery of one end of the injection cylinder (1).

6. A micro-quantitative glue injection process according to claim 5, characterized in that: In step S1, the inner diameter of the glue injection cavity (101) is 0.5-2 mm; the diameter of the glue injection vent hole (102) is 0.2-0.4 mm.

7. A micro-quantitative glue injection process according to claim 6, characterized in that: In step S1, the glue injection cylinder (1) and the glue injection push rod (2) are both made of high molecular weight polypropylene material.

8. A micro-quantitative glue injection process according to claim 1, characterized in that: In step S3, the method for eliminating bubbles in the adhesive is to let the prepared adhesive stand and wait for the bubbles to disappear by themselves, or to use a degassing device to eliminate the bubbles.

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