阅读说明：本技术 一种单体自动浇注装置及其浇注方法 (Automatic monomer pouring device and pouring method thereof ) 是由 孟红祥 于 2020-03-16 设计创作，主要内容包括：本发明涉及单体浇注领域,公开了一种单体自动浇注装置及其浇注方法,其包括合模腔体(1),合模腔体(1)的上端设有泄气口(11),还包括抽气管(2),抽气管(2)上有利用光电技术或电容特性来探测的单体探测装置(3)。光电技术的单体探测装置(3)包括光源(31)、被检测段(30)和探测器(32),经过被检测段(30)的光线并分析接收到的光强大小或光线位置变化；单体探测装置(3)也可为电容探测器,探测器(33)利用被检测段(30)内有无单体的两种不同的电容特性来实现检测。本发明结构简单合理、实用性强,且不存在浪费单体的情况。(The invention relates to the monomer pouring field, and discloses a monomer automatic pouring device and a pouring method thereof, wherein the monomer automatic pouring device comprises a die closing cavity (1), the upper end of the die closing cavity (1) is provided with an air leakage opening (11), the monomer automatic pouring device also comprises an air exhaust pipe (2), and a monomer detection device (3) which is used for detecting by using a photoelectric technology or a capacitance characteristic is arranged on the air exhaust pipe (2). The single detection device (3) of the photoelectric technology comprises a light source (31), a detected section (30) and a detector (32), and the light passing through the detected section (30) analyzes the received light intensity or light position change; the single body detection device (3) can also be a capacitance detector, and the detector (33) realizes detection by utilizing two different capacitance characteristics of whether a single body exists in the detected section (30). The invention has simple and reasonable structure and strong practicability, and does not waste monomers.)

1. The utility model provides an automatic monomer pouring device, includes compound die cavity (1), its characterized in that: the upper end of compound die cavity (1) is equipped with disappointing mouth (11), still include exhaust tube (2) near disappointing mouth (11), and exhaust tube (2) are discharged the gas in compound die cavity (1) through disappointing mouth (11), install monomer detecting device (3) on exhaust tube (2) the pipeline, and disappointing mouth (11) are located the top of compound die cavity (1), and pouring tube (4) communicate and are close to disappointing mouth (11) and set up with compound die cavity (1).

2. The automatic casting device of a single body according to claim 1, wherein: the single detecting device (3) comprises a light source (31), a detected section (30) and a detector (32), the detected section (30) is located in the exhaust pipe (2), the detector (32) is a photoelectric detector, the light source (31) penetrates through the detected section (30) and is arranged towards the detector (32), and the detector (32) receives light emitted by the light source (31) and analyzes the size of the received light intensity and the position change of the received light.

3. The automatic casting device of a single body according to claim 2, wherein: the light source (31) can penetrate through the detected section, and the photoelectric detector (32) is a photoelectric tube, a camera, a four-quadrant detector, a PSD or a photoelectric array.

4. The automatic casting device of a single body according to claim 1, wherein: the monomer detection device (3) is a capacitance detector (33), and the monomer detection device (3) detects whether a monomer exists in the detected section (30) by using the capacitance characteristic change when the monomer exists in the detected section (30).

5. The automatic casting device of a single body according to claim 1, wherein: the mould closing device is characterized by further comprising a pouring tube (4) and a single container (41), wherein one end of the pouring tube (4) is communicated with the single container (41), and the other end of the pouring tube (4) is communicated with the mould closing cavity (1) and conveys a single body to an inner cavity of the mould closing cavity (1).

6. The automatic casting device of a single body according to claim 5, wherein: the pouring pipe (4) is provided with a pouring valve (42) and the on-off of the pouring pipe (4) is controlled through the pouring valve (42).

7. The automatic casting device of a single body according to claim 1, wherein: one end of the exhaust tube (2) close to the die closing cavity (1) is defined as the inner end, the outer end of the exhaust tube (2) is provided with a negative pressure device (21), and the outer end of the exhaust tube (2) is also provided with a waste liquid containing bottle (22).

8. The automatic casting device of a single body according to claim 1, wherein: the section (30) to be detected is a glass tube or a plastic tube, and the inner diameter of the section (30) to be detected is not more than 3 mm.

9. A casting method of a one-piece automatic casting apparatus according to claims 1 to 8, characterized in that: the method comprises the following steps:

1) placing the monomer in a monomer container (41);

2) opening a pouring valve (42) and enabling the monomer in the monomer container (41) to flow into the mold closing cavity (1);

3) starting the monomer detection device (3) to work, and analyzing the light intensity and position change of the light penetrating through the detected section (30) to detect whether the monomer flows through or not or detecting whether the monomer flows through outside the detected section (30) by utilizing the capacitance characteristic;

4) when the monomer flows into the die closing cavity (1), the negative pressure device (21) starts to work, the monomer pushes the gas in the die closing cavity (1) to be exhausted out of the die closing cavity (1), and the inner cavity of the die closing cavity (1) is pumped through the negative pressure device (21) and the exhaust pipe (2);

5) when the die closing cavity (1) is fully filled with the monomer, the monomer can be pumped into the exhaust pipe (2) along the overflow air leakage opening (11), and when the monomer moves to the detected section (30) of the exhaust pipe (2), the monomer detecting device (3) detects that the monomer flows through, so that the fact that the die closing cavity (1) is fully filled with the monomer is analyzed;

the pouring valve (42) is closed and the pouring is stopped.

Technical Field

The invention relates to the field of monomer pouring, in particular to an automatic monomer pouring device and a pouring method thereof.

Background

Nowadays, people who wear glasses are more and more, people with myopia due to eye fatigue, and middle-aged and elderly people with age-related eye function deterioration, who need to wear glasses to correct diopter, which raises the demand for spectacle lenses for correcting optical vision or for protecting vision. The person is unlikely to leave the glasses for a lifetime, or is near-sighted, or is aged. The base of the glasses is very large, just because the person cannot leave the glasses.

Most ophthalmic lenses use thermosetting materials such as CR39, 1.56 materials, MR series polyurethanes, etc., which are generally viscous transparent liquids in their initial state, which we refer to as monomers. Liquid monomer to solid lens generally goes through the processes of mold closing, casting, curing, mold releasing and edge turning. The pouring process is to fill the monomer into a mold closing cavity formed by combining the glass mold A (referred to as mold A) and the glass mold B (referred to as mold B) according to requirements by using an adhesive tape. After the monomer is filled in the die cavity, the monomer is subjected to thermal excitation polymerization reaction to form a solid lens blank, and then the lens is formed after demoulding and edge turning. At present, all processes except pouring are automated, and only the pouring process cannot be automated due to the fact that the liquid level cannot be detected accurately at present and can be completed only by manual filling. Because the resin monomer generally has pungent volatile smell and weak toxicity, the wall surface of each casting shop has a layer of sticky substances. These sticky substances are monomers volatilized during the casting process, and the volatilized substances also enter lung lobes of operators. Therefore, the pouring process has the damage to the health of human bodies, and new technical innovation is needed to protect the health of workers.

The automatic control of the casting of the monomer is currently divided into two categories: the method is based on a liquid level detection technology; the second is a volume method. Patent CN 105848844 a proposes a technique based on the volume method, but since the cavity volume varies with lens changes, it is difficult to control the cavity volume accurately in practice, and no automatic casting machine based on this technique is available. The liquid level detection technology mainly comprises the modes of capacitance measurement, ultrasonic measurement, laser ranging, white light interferometry and machine vision. Unfortunately, none of these conventional approaches effectively sense or control the level to exactly the 100% full position during the lens monomer casting process, with the result that either the level is under-filled or overfilled and the level overflows, resulting in a failed automated casting.

ZL 201710444340.7 proposes a method for detecting liquid level by light spot displacement change or light intensity change, which realizes a possible technical route, but when the surface of the matched mould cavity has irregular progressive multi-focus and double-light surface shape distribution, the cavity loses the center reference of full half value, and then either the liquid level is not filled enough or the liquid level is over-filled, which leads to the failure of automatic casting.

The mold closing cavity is a closed cavity, and when monomer is injected, air in the cavity needs to be exhausted sometimes. Then we assume that: if we open a air-release opening on the adhesive tape of the mold closing cavity, the air-release opening is opened at the highest point of the mold closing cavity, and the pouring tube is arranged close to the air-release opening, and the air-exhaust pipeline is positioned above the air-release opening and is close to the air-release opening. On one hand, the air can be sucked quickly, so that negative pressure is kept in the cavity, bubbles formed in the pouring process can overflow quickly, meanwhile, a monomer detector is arranged on the air exhaust pipeline, and the automatic pouring can be perfectly realized by using the criterion that whether monomers exist in the pipeline as the monomers are filled into the die assembly cavity or not, so that the invention is produced.

Disclosure of Invention

The invention provides a single automatic pouring device and a pouring method thereof, aiming at the defect that the completion of pouring cannot be automatically detected in the prior art.

In order to solve the technical problem, the invention is solved by the following technical scheme:

the utility model provides an automatic pouring device of monomer, includes the compound die cavity, and the upper end of compound die cavity is equipped with disappointing mouthful, still includes and the exhaust tube near disappointing mouthful, and the exhaust tube is near disappointing mouthful and is carried out the exhaust to the internal gas of involution die cavity, installs monomer detecting device on the exhaust tube, and the monomer detector can be the monomer detecting device based on photoelectric technology or electric capacity characteristic. The photoelectric monomer detection device comprises a light source, a detected section and a detector, wherein the detected section is positioned in the exhaust tube, the light source penetrates through the detected section and is arranged towards the detector, the detector receives light emitted by the light source and analyzes the size of the received light intensity or the change of the position of the light, and therefore whether a monomer is positioned in the detected section of the exhaust tube or not is analyzed. The single body detecting device using the capacitance characteristic is to place a capacitance detector around the detected section and detect whether a single body exists in the detected section by using the capacitance characteristic change of the single body in the detected section.

Preferably, the detector is a detection device based on photoelectric technology, and more preferably, the detected segment is formed as a part of the detector and detects the detected segment according to the position change of the light.

Preferably, the photodetector is a photocell, a camera, a PSD, a four quadrant detector, or a photoelectric array.

Preferably, the single detector is a capacitance detector, and the single detector is a detection device utilizing capacitance, namely, the single detector realizes detection by utilizing the capacitance characteristic change of the single detector.

Preferably, the mould closing device further comprises a pouring pipe and a single container, wherein one end of the pouring pipe is communicated with the single container, and the other end of the pouring pipe is communicated with the mould closing cavity and conveys the single body to an inner cavity of the mould closing cavity.

Preferably, the pouring pipe is provided with a pouring valve, and the on-off of the pouring pipe is controlled by the pouring valve.

Preferably, the air release port is positioned at the uppermost end of the mold clamping cavity, and a connecting port of the pouring tube and the mold clamping cavity is arranged close to the air release port.

Preferably, one end of the exhaust tube close to the mold clamping cavity is defined as the inner end, the outer end of the exhaust tube is provided with a negative pressure device, and the outer end of the exhaust tube is also provided with a waste liquid containing bottle.

Preferably, the inner diameter of the detected section is not more than 3mm, and the detected section is a glass tube or a plastic tube.

A pouring method of a single automatic pouring device comprises the following steps:

1) placing the monomer in a monomer container;

2) opening a pouring valve and enabling the monomer in the monomer container to flow into a die assembly cavity;

3) starting the single body detection device to work, and monitoring the light intensity and position change of the light rays penetrating through the detected section or detecting whether a single body exists or not in the detected section by utilizing the capacitance characteristic;

4) when the monomer flows into the die closing cavity, the negative pressure device starts to work, the monomer pushes the gas in the die closing cavity to be discharged out of the die closing cavity, and the inner cavity of the die closing cavity is pumped by the negative pressure device and the exhaust tube;

5) after the compound die cavity is filled with the monomer, the monomer can overflow and lose heart mouthful and be taken out into the exhaust tube, when the monomer moved to the transparent section of exhaust tube, monomer detection device monitored when seeing through the light intensity size, the position change in the section of being detected or when detecting that the capacitance value has the change, closed the pouring valve, stopped the pouring.

Due to the adoption of the technical scheme, the invention has the remarkable technical effects that: this application simple structure is reasonable, the practicality is strong, and does not have the free condition of extravagant.

Drawings

Fig. 1 is a schematic structural view of the present invention.

Fig. 2 is a left side view of a portion of the structure of fig. 1.

Fig. 3 is a schematic view of the optical path of the light beam passing through the section to be detected in the middle of the light beam in the first case of embodiment 1.

Fig. 4 is a schematic diagram of an optical path through which a light beam passes in a non-central manner in the second case of embodiment 1.

Fig. 5 is a schematic view of the optical path of the light beam along the inner wall of the section to be detected in case three of embodiment 1.

Fig. 6 is a schematic structural view of the case four single body detecting device of embodiment 2 being a capacitance detector.

The names of the parts indicated by the numerical references in the drawings are as follows: the device comprises a mold closing cavity 1, a mold closing cavity 2, an air exhaust pipe 3, a single body detection device 4, a pouring pipe 11, an air leakage port 21, a negative pressure device 22, a waste liquid containing bottle 30, a detected section 31, a light source 32, a photoelectric detector 33, a capacitance detector 41, a single body container 42 and a pouring valve 42.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.

Example 1

An automatic monomer pouring device comprises a die assembly cavity 1, wherein the upper end of the die assembly cavity 1 is provided with an air leakage opening 11, the automatic monomer pouring device also comprises an air exhaust tube 2 close to the air leakage opening 11, the air exhaust tube 2 is close to the air leakage opening 11 to exhaust air in the die assembly cavity 1, a monomer detection device 3 is installed on the air exhaust tube 2, the monomer detection device 3 comprises a light source 31, a detected section 30 and a detector 32, the detected section 30 is positioned on the air exhaust tube 2, the middle part of the air exhaust tube 2 is provided with a disconnection, the upper end and the lower end of the detected section 30 are connected with the disconnection and form a uniform tube body with the air exhaust tube 2, the detector 32 is a photoelectric detector, the light source 31 penetrates through the detected section 30 and is arranged towards the detector 32, the detector 32 receives light emitted by the light source 31, and the light passing through the section 30 to be detected and the received light intensity or the light position change are analyzed, so that it is analyzed that enough monomers are positioned in the section 30 to be detected of the exhaust tube 2. The light source 31 is a light source that can penetrate through the detected segment, and the photodetector 32 is a photoelectric tube, a camera, a PSD, a four-quadrant detector or a photoelectric array.

The detection is realized by the change of the transmitted light intensity or position, and the following conditions can be adopted:

the first condition is as follows: the detector 32 is a photodetector. Light from a light source 31 passes symmetrically along the optical axis from the center of the section 30 being inspected and onto a detector 32 also positioned along the optical axis, as shown in fig. 3.

When no single body exists in the detected section 30, the detected section 30 acts as a negative lens to play a role of diverging the light beam, the light beam width when the light source 31 passes through the detected section 30 and reaches the detector 32 is P1P2, the size is larger than the receiving range of the detector 32, and only part of the light beam is received by the detector 32; when there is a cell in the detected segment 30, the detected segment 30 functions as a positive lens, functioning to converge the light beam. The transmitted light from the light source 31, except for the reflection at the partial interface, is entirely directly focused on the detector 32 through the segment 30 to be detected. Thus, it can be known whether the monomer flows through the detected section 30 by using different electrical signals outputted by the detector 32 corresponding to different light intensities.

Case two: the detector 32 is a photodetector. The light emitted from the light source 31 deviates from the optical axis, and is projected onto the glass tube 12, and passes through one side of the detected section 30, and the detector 9 is disposed along the optical axis, as shown in fig. 4, when there is no single body in the detected section 30, the detected section functions as a negative lens, and plays a role of diverging the light beam, the light beam width when the light source 31 passes through the detected section 30 and reaches the detector 32 is P2, and no light or only part of the light is received by the detector 32; when there is a cell in the detected segment 30, the detected segment 30 functions as a positive lens, functioning to converge the light beam. The transmitted light from the light source 31, except for the reflection at the partial interface, is entirely directly focused on the detector 32 through the segment 30 to be detected. Thus, it can be known whether the monomer flows through the detected section 30 by using different electrical signals outputted by the detector 32 corresponding to different light intensities.

Case three: the detector 32 is a photodetector. The light emitted by the light source 31 is not centered along the optical axis but passes through the dividing point P3 between the inner wall of the section 30 to be detected and the air, and the detector 9 is placed on the optical axis as shown in fig. 5.

When no single body exists in the detected section 30, the light source 31 generates total internal reflection through the detected section 30 and reaches a point P2, and no light or only part of light is received by the detector 32; when there is a single body in the section 30 to be detected, the light source 31 does not undergo total internal reflection through the section 30 to be detected. The light emitted from the light source 31 passes through the section 30 to be detected and is directly converged on the detector 32. Thus, it can be known whether the monomer flows through the detected section 30 by using different electrical signals outputted by the detector 32 corresponding to different light intensities.

The above three cases show that the light beam after passing through can be deflected when there is a monomer in the detected segment 30. Detectors 32, disposed at different locations, can sense different light intensities; detectors 32, which are disposed at the same location, may also sense different light intensities. In practical implementation, we choose to arrange the detectors 32 at the same positions, and the structure is simpler.

Example 2

The single body detector 3 is a capacitance detector, and the single body detector 3 detects whether a single body flows through the detected section by using the capacitance characteristic change of the detected section 30.

A method for detecting a cell based on a change in capacitance of the cell in a section 30 to be detected. The specific judgment method is the case four:

case four: the single body detector 3 is a capacitance detector. A capacitance-sensitive detector is disposed around the section 30 to be detected, and whether or not the cell flows through the section 30 to be detected is detected by using a change in capacitance characteristics caused by the presence or absence of the cell in the section 30 to be detected.

Example 3

The mold clamping device is the same as the embodiment 1, but also comprises a pouring tube 4 and a monomer container 41, wherein one end of the pouring tube 4 is communicated with the monomer container 41, and the other end of the pouring tube 4 is communicated with the mold clamping cavity 1 and conveys a monomer to the inner cavity of the mold clamping cavity 1.

The pouring pipe 4 is provided with a pouring valve 42, and the on-off of the pouring pipe 4 is controlled through the pouring valve 42.

The air release port 11 is positioned at the uppermost end of the die assembly cavity 1, and a connecting port of the pouring tube 4 and the die assembly cavity 11 is arranged close to the air release port 11.

In the application, the pumping pipe 2 and the cavity of the mold clamping cavity 1 can move up and down relatively and vertically with the help of the motion mechanism. On one hand, the movement mechanism which moves vertically relative to the mold closing cavity can utilize the air exhaust pipe 2 to poke an air leakage opening on the adhesive tape of the mold closing cavity 1, so that accurate alignment is realized; on the other hand, the distance between the exhaust pipe 2 and the air leakage opening 11 on the die closing cavity 1 can be conveniently adjusted.

Example 4

The same as embodiment 3, except that one end of the exhaust tube 2 abutting against the mold clamping chamber 1 is defined as its inner end, the outer end of the exhaust tube 2 is provided with a negative pressure device 21, and the outer end of the exhaust tube 2 is also provided with a waste liquid storage bottle 22. The monomer in the waste liquid receiving bottle 22 can be used for pouring again after being exhausted.

The exhaust tube 2 is provided with a section 30 to be detected, the inner diameter of the section 30 to be detected is not more than 3mm, and the section 30 to be detected is a glass tube or a plastic tube.

A pouring method of a single automatic pouring device comprises the following steps:

1) placing the monomer in the monomer container 41;

2) opening the pouring valve 42 and making the monomer in the monomer container 41 flow into the mold clamping cavity 1;

3) and starting the operation of the monomer detection device 3, and monitoring the light intensity and the light position change in the detected section 30 or detecting whether a monomer exists in the detected section by using the capacitance characteristic. When the single detecting device 3 is a photoelectric detector, the single detecting device 3 monitors the light intensity and the light position change in the detected section 30; when the monomer detection device 3 is a capacitance detector, the monomer detection device 3 detects whether the monomer flows through the detected section by using the capacitance characteristic outside the detected section;

4) when the monomer flows into the die closing cavity 1, the negative pressure device 21 starts to work, the monomer pushes the gas in the die closing cavity 1 to be discharged out of the die closing cavity 1, and the inner cavity of the die closing cavity 1 is pumped by the negative pressure device 21 and the exhaust tube 2;

5) when the monomer fills the die closing cavity 1, the monomer overflows the air leakage opening 11 and is pumped into the exhaust tube 2, and when the monomer moves to the detected section 30 of the exhaust tube 2, the monomer detection device 3 monitors the light intensity and the light position in the detected section 30 or detects that the capacitance value is changed, the die closing cavity is filled;

6) the pouring valve 42 is closed, pouring is stopped, and pouring is finished;

in summary, the above-mentioned embodiments are only preferred embodiments of the present invention, and all equivalent changes and modifications made in the claims of the present invention should be covered by the claims of the present invention.