A photoelectric switch housing injection mold

Abstract

The application relates to the technical field of injection molds, in particular to an optical-electric switch shell injection mold, which comprises a male mold, a female mold, and a biasing and lubricating device, the male mold is provided with a plurality of guide columns, the female mold is provided with a plurality of guide sleeves, each guide sleeve is provided with the biasing and lubricating device, and the biasing and lubricating device transmits lubricating material in the guide sleeve from the bottom wall to the top wall in the process that the guide column enters the guide sleeve. The biasing and lubricating device is arranged in the guide sleeve, the lubricating material at the bottom of the guide sleeve is circulated into the guide sleeve from the top of the guide sleeve through the pipeline by the pushing force generated when the guide column enters the guide sleeve, so that the lubricating material is circulated in the guide sleeve, the lubricating material is prevented from being accumulated on the lower bottom wall of the guide sleeve due to gravity, the upper part of the guide column and the guide sleeve is prevented from being abraded and cannot be normally matched due to insufficient lubrication, the normal closing of the mold is prevented from being affected, and the mold is further prevented from being damaged and producing defective products.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of injection mold, in particular to a photoelectric switch shell injection mold. BACKGROUND

[0002] The photoelectric switch shell is mostly made of plastic material, and injection molding is one of the main molding methods for plastic. The injection mold can be divided into vertical and horizontal types. The vertical mold has a large vertical space and is usually used in the factory workshop. After opening, the product needs to be grabbed. In comparison, the horizontal mold occupies less vertical space and has lower requirements for the layout of the site. In addition, the product can automatically fall down by gravity, and the cost of demolding is lower. Therefore, the injection molding of the photoelectric switch shell mostly uses a horizontal mold.

[0003] The structure of the horizontal injection mold usually consists of a molding part, a pouring system, a guide part, a ejection mechanism, a temperature control system, an exhaust system, and a support part. When opening and closing, the guide column and the guide sleeve installed on the mold are slidably matched, so that the mold is matched at the correct position. The matching precision of the guide column and the guide sleeve directly affects the precision of the molded product, so the machining precision of the guide column and the guide sleeve needs to reach the micron level.

[0004] The opening and closing of the horizontal mold is realized by the sliding fit of the guide column and the guide sleeve of the mold. The sliding requires the use of lubricating medium to reduce friction. However, due to gravity, the lubricating medium will accumulate at the lower part of the guide sleeve, making it difficult to lubricate the upper half of the guide column and the guide sleeve. For example, using Molykote brand MLK-EM30L model lubricating grease with NLGI consistency grade of level one for C-RD2010L5 type horizontal guide column and guide sleeve, due to the fact that the lubricating material in the upper half of the guide column and the guide sleeve always flows downward, the service life of the guide column and the guide sleeve is about 200,000 times, which is much lower than the theoretical service life of 400,000 times. In addition, the lubrication of the upper half of the guide column and the guide sleeve is always insufficient, which will cause friction and damage, thereby affecting the normal closing of the mold, and even causing damage to the mold and producing defective products.

[0005] Therefore, a photoelectric switch shell injection mold is proposed. SUMMARY

[0006] The purpose of the present application is to provide a photoelectric switch shell injection mold, which solves the problems in the background art by providing a biasing and lubricating device in the guide sleeve of the mold.

[0007] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0008] A photoelectric switch shell injection mold, comprising:

[0009] The photoelectric switch shell injection mold is placed horizontally;

[0010] The male die is provided with a plurality of guide columns;

[0011] The female die is provided with a plurality of guide sleeves;

[0012] Further comprising:

[0013] The biasing and lubricating device is arranged in each of the guide sleeves, and the biasing and lubricating device transmits the lubricating material in the guide sleeve from the bottom wall to the top wall in the process of the guide column entering the guide sleeve.

[0014] The guide columns and the guide sleeves provide all guiding and partial supporting functions in the sliding fitting process of the male die and the female die, and the fitting surfaces of the guide columns and the guide sleeves are filled with lubricating materials.

[0015] Preferably, the biasing and lubricating device comprises an oil channel arranged in the right side wall of the guide sleeve, the oil channel is communicated with the bottom wall and the top wall of the guide sleeve, the top wall of the guide sleeve is provided with an oil pipe, the oil pipe is communicated with the oil channel, and the top wall of the guide sleeve is provided with a plurality of nozzles penetrating the top wall, and the nozzles are communicated with the oil pipe.

[0016] When the male die and the female die are horizontally placed, the lowest potential energy point in the guide sleeve is located at the bottom wall, and the highest potential energy point in the guide sleeve is located at the top wall, the retained lubricating material on the bottom wall of the inner wall of the guide sleeve and the top wall of the inner wall of the guide sleeve form a channel for the circulation of the lubricating material, so that the lubricating material is uniformly distributed on the inner wall of the guide sleeve, and the problem of uneven biasing and lubrication caused by gravity is avoided.

[0017] Preferably, the nozzles are conical, the diameter of the nozzles near the inner wall is small, the diameter of the nozzles near the outer wall is large, and each of the nozzles is provided with a micro check valve.

[0018] When the guide post pushes the lubricating material gathered on the lower inner wall of the guide sleeve to the right, some air and lubricating material will be pushed from the guide sleeve into the nozzle, and the conical nozzle with a small inner diameter and a large outer diameter can slow down the amount and speed of the air and lubricating material flowing directly back into the nozzle from the guide sleeve. When the lubricating material is pressed into the oil channel through the oil pipe and finally re-enters the guide sleeve from the nozzle on the top wall of the guide sleeve, according to Bernoulli's principle, the conical nozzle can enlarge the speed of the lubricating material entering the guide sleeve from the nozzle, increase the ejection pressure of the lubricating material, and further increase the ejection area of the lubricating material, thereby improving the lubrication efficiency. The smaller the opening of the inner wall of the guide sleeve, the more conducive to improving the service life of the guide post and the sealing ring, and the lower the wear of the guide post and the sealing ring. The micro one-way valve can effectively prevent the lubricating material from being directly pushed into the nozzle from the guide sleeve into the oil channel, improve the circulation efficiency of the lubricating material, and improve the lubrication effect of the guide post and the guide sleeve.

[0019] Preferably, the oil pipe is made of flexible transparent material.

[0020] The oil pipe can be made of PVC or other flexible transparent materials with certain strength, which can more directly detect the operation of the whole eccentric wear lubrication device, including but not limited to monitoring the air bubbles affecting the circulation efficiency of the lubricating material, and determining the cleanliness of the lubricating material by color.

[0021] Preferably, the guide sleeve is provided with a cavity structure for accommodating lubricating material, and the cavity structure is located at the lowest potential position of the inner wall of the guide sleeve.

[0022] Compared with the guide sleeve without circulation of lubricating material, more lubricating material is required for turnover circulation. When the guide post enters the guide sleeve and moves right along the axial direction of the guide sleeve, the space in the guide sleeve for storing lubricating material will be compressed. The guide sleeve provided with the cavity structure for accommodating lubricating material can improve the circulation efficiency of the lubricating material. Since the cavity structure can store more lubricating material, the frequency of supplementing lubricating material can also be reduced. The cavity structure is located at the lowest potential position of the inner wall of the guide sleeve, which is beneficial to the lubricating material.

[0023] Preferably, the cavity structure includes a downwardly inclined slope provided on the side of the inner wall of the guide sleeve away from the opening of the guide sleeve, and the opening of the oil channel on the right side wall of the guide sleeve is located at the lowest point of the slope. The slope is provided with a magnetic chip collection area for collecting iron powder.

[0024] The slope inside the guide sleeve forms an additional space which does not interfere with the reciprocating movement of the guide pin, which is conducive to simplifying the structural layout of the entire device and reducing the development cost of the device. If more space is needed to store lubricating material for circulation, an additional cavity structure can be provided at the position of the potential energy reduction outside the guide sleeve. Advantageously, the opening of the oil channel on the right side wall of the guide sleeve is located at the lowest point of the slope, which enables all the lubricating material in the cavity structure to participate in the circulation, thereby improving the utilization rate and circulation efficiency of the lubricating material. When the guide pin and the guide sleeve are in sliding fit, iron powder is generated due to friction, which can be collected by the magnetic scrap collecting area, thereby reducing the flow and circulation of the iron powder along with the lubricating material in the guide pin and the guide sleeve and reducing the wear of the guide pin and the guide sleeve.

[0025] Preferably, the magnetic scrap collecting area is located at the lowest point of the slope, and a groove for collecting iron powder is provided in the slope. A magnetic block is installed at the position of the guide sleeve outside the periphery of the groove.

[0026] The position near the groove is magnetized and has magnetism. In addition, the guide sleeve near the groove can also be magnetized by local magnetization technology. The specific principle is similar to the magnetization of the head part of a screwdriver. When the iron powder flows along with the lubricating material in the guide sleeve to the groove, the iron powder is gradually magnetically adsorbed and fixed in the groove.

[0027] Preferably, a throttling device is installed on the guide pin and the guide sleeve to reduce the loss of lubricating material.

[0028] The eccentric wear lubricating device improves the transmission and circulation efficiency of the lubricating material, which can be more evenly attached to the contact surface of the guide pin and the guide sleeve. At the same time, the loss of lubricating material is also increased to a certain extent. The throttling device is used to slow down the loss of lubricating material.

[0029] Preferably, the throttling device includes a sealing ring installed on the guide pin, and also includes an annular adsorption belt installed on the end face of the guide pin near the guide sleeve. A ring-shaped scraper is installed at the left opening of the guide sleeve and is used in cooperation with the annular adsorption belt.

[0030] The annular adsorption belt can be made of hydrophilic polyurethane material or equivalent material. Polyurethane has the advantages of strong adsorption and not easy to drop slag. The annular adsorption belt can uniformly adsorb the lubricating material in the guide sleeve. Every time the guide pin enters and exits the guide sleeve, the annular adsorption belt can contact the guide sleeve. At this time, the lubricating material adsorbed on the annular adsorption belt can lubricate the guide sleeve, reducing the friction between the guide pin and the guide sleeve. The material of the annular adsorption belt is relatively soft and can be easily compressed. When the guide pin is separated from the guide sleeve, the lubricating material adhered to the guide pin will be scraped out by the ring-shaped scraper and gradually accumulated at the end face position of the guide pin near the guide sleeve. Finally, it will accumulate at the position of the annular adsorption belt. The annular adsorption belt can also be more efficiently scraped by the ring-shaped scraper to remove the excess lubricating material attached to the surface, so as to leave more lubricating material in the guide sleeve and further reduce the loss of lubricating material.

[0031] Preferably, the guide sleeve is provided with a visual observer, the visual observer comprises a bottom channel provided at the lowest potential position of the inner wall slope and penetrating downwardly through the lower inner wall, a transparent U-shaped observation tube is installed on the lower bottom wall of the guide sleeve, the observation tube is in communication with the bottom channel, an opening and closing air hole is arranged at the end of the observation tube away from the guide sleeve, and a tricuspid lens is installed on the rod part of the end of the observation tube away from the guide sleeve.

[0032] The transparent U-shaped observation tube is used for observing the liquid level height of the lubricating material in the guide sleeve and the working condition of the lubricating material, according to the principle of communicating vessels, when the equipment is not running, the liquid level of the lubricating material in the U-shaped observation tube is consistent with the liquid level of the lubricating material in the guide sleeve, when the guide column enters the guide sleeve, the guide column pushes the lubricating material in the guide sleeve to the right, at this time, the liquid level rising in the observation tube can be observed, when the guide column is separated from the guide sleeve, the guide column pulls the lubricating material in the guide sleeve to the left, at this time, the liquid level falling in the observation tube can also be observed, and the opening and closing air hole is used for exhausting and reducing pressure. In order to ensure the safety of operation, the operator cannot closely observe the liquid level change in the observation tube when the equipment is running, the tricuspid lens installed on the observation tube can be used as a magnifying glass, and the shape of the tricuspid lens is the same as that of a mercury body thermometer, so that the operator can clearly observe the liquid level change in the observation tube in a relatively safe position.

[0033] Compared with the prior art, the beneficial effects of the present application are:

[0034] 1. The lubricating material accumulated in the lower position of the guide sleeve due to gravity is transmitted from the lower inner wall of the guide sleeve to the higher potential position in the guide sleeve by the cooperation of the guide column and the eccentric wear lubricating device arranged in the guide sleeve after the guide column enters the guide sleeve, so as to reduce the loss of the lubricating material on the upper half of the cross section of the guide column and the guide sleeve due to gravity, and to reduce the insufficient lubrication and the increase of the wear of the outer surface of the guide column and the guide sleeve.

[0035] 2. The cooperation of the guide column and the eccentric wear lubricating device arranged in the guide sleeve can collect the iron powder generated by the mutual friction of the guide column and the guide sleeve, and can magnetically fix the collected iron powder at the lower potential position in the guide sleeve, so as to reduce the transmission activity of the iron powder in the guide sleeve, and to further reduce the wear of the guide column and the guide sleeve, and to improve the cooperation precision and the service life of the guide column and the guide sleeve.

[0036] 3. The present application is provided with a visual observation device, the lubrication condition and the remaining amount of the lubricating material in the guide column and the guide sleeve can be more directly monitored by the external device during the sliding fitting movement of the guide column and the guide sleeve, the operator can conveniently add the lubricating material to the guide column and the guide sleeve in time, the dependence on experience is reduced, the probability of subjective judgment error is reduced, the use cost is reduced to a certain extent, and the labor intensity is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0037] Figure 1 It is a perspective view of the appearance of the present application;

[0038] Figure 2 It is a structural schematic view of the present application;

[0039] Figure 3 It is Figure 2 A-A sectional view of the present application.

[0040] In the figure: 1, guide pillar; 11, sealing ring; 12, annular adsorption belt; 2, guide sleeve; 21, slope; 211, groove; 22, oil channel; 23, oil pipe; 24, micro one-way valve; 25, nozzle; 26, bottom channel; 27, observation tube; 28, three-pronged lens; 29, annular scraper; 3, male die; 4, female die; 5, magnetic block. DETAILED DESCRIPTION

[0041] Please refer to Figures 1 to 3 , the present application provides a kind of photoelectric switch shell injection mold, technical scheme as follows:

[0042] The main working principle of the present application is: by setting the eccentric wear lubricating device in the guide sleeve 2, the lubricating material accumulated at the bottom of the guide sleeve 2 is pushed into the oil channel 22 through the bottom channel 26 by the thrust generated when the guide pillar 1 enters the guide sleeve 2, and then flows into the oil pipe 23, the lubricating material is circulated into the guide sleeve 2 from the top of the guide sleeve 2 oil pipe 23, so as to realize the circulation of the lubricating material in the guide sleeve 2, avoid the accumulation of lubricating material in the lower bottom wall of the guide sleeve 2 due to gravity, avoid the dry friction caused by insufficient lubrication of the upper part of the guide pillar 1 guide sleeve 2, avoid damaging the mold and producing defective products. Specific example one:

[0044] The simulation parameters adopt Molykote brand MLK-EM30L type lubricating grease, NLGI consistency grade is first grade, and are applied to horizontally placed C-RD2010L5 type guide pillar 1 guide sleeve 2, since the lubricating material of the upper half of the guide pillar 1 and the guide sleeve 2 always flows downward, in the working environment without setting the eccentric wear lubricating device, the service life of the guide pillar guide sleeve is about 200,000 times.

[0045] Referring to Figure 2 As shown in the figure, because the viscosity of the MLK-EM30L type lubricating grease is large and the flowability is poor, the lubricating grease is difficult to fill and flow in the visual observer, and the lubricating condition in the guide sleeve 2 cannot be directly judged through the visual observer, so the visual observer can not be set on the guide sleeve 2.

[0046] In the mold working process, that is, when the male die 3 and the female die 4 approach each other, the guide pillar 1 starts to enter the guide sleeve 2. Because the grease on the axial surface of the guide pillar 1 adheres to dust and other impurities, when the guide pillar 1 contacts the annular scraper 29, the annular scraper 29 will scrape off the impurities adhered to the axial surface of the guide pillar 1. At the same time, the annular scraper 29 will block the grease flowing to the lower part due to gravity in the guide sleeve 2, preventing overflow. The annular adsorption belt 12 first enters the guide sleeve 2. The adsorption force of the grease on the annular adsorption belt 12 is greater than that on the metal material. At this time, the grease adhered to the annular adsorption belt 12 is relatively uniform. Therefore, the grease of the annular adsorption belt 12 first contacts the guide sleeve 2, ensuring that the entire inner wall surface of the guide sleeve 2 is always adhered to the grease. As the guide pillar 1 continues to enter, the sealing ring 11 starts to form a more compact fit with the inside of the guide sleeve 2. The guide pillar 1 produces a more obvious piston effect in the guide sleeve 2, pushing the grease in the guide sleeve 2. When the grease flows through the nozzle position, because of the existence of the micro one-way valve 24, the grease in the guide sleeve 2 cannot directly enter the oil pipe 23. Except for a small amount of grease evenly adhered to the inner surface of the guide sleeve 2, all the rest of the grease is pushed to the right. Because of the continuous entry of the guide pillar 1, the space in the guide sleeve 2 is compressed. At this time, the grease in the guide sleeve 2 collects at the lower right of the guide sleeve 2 under the action of its own gravity and the pushing force of the guide pillar 1. Subsequently, it enters the oil channel 22 through the oil channel 22 inlet located at the lowest point of the slope 21, then enters the oil pipe 23, and then enters the guide sleeve 2 from the nozzle 25 position through the micro one-way valve 24. Because the guide pillar 1 is located in the guide sleeve 2 at this time, most of the grease flows onto the guide pillar 1. Under the action of gravity and the pushing force of the guide pillar 1, the grease flows downward from the gap between the guide pillar 1 and the guide sleeve 2. Because the guide pillar 1 and the guide sleeve 2 are reciprocating, the grease in the gap between the guide pillar 1 and the guide sleeve 2 at this time will be evenly coated on the entire guide sleeve 2 due to the reciprocating motion of the guide pillar 1 and the guide sleeve 2.

[0047] In this simulation parameter operation, the service life of the C-RD2010L5 type guide pillar 1 and guide sleeve 2 can be improved to 350,000 times, close to the theoretical service life of 400,000 times.

[0048] During the grease flow process, the iron powder generated by the guide pillar 1 and the guide sleeve 2 during the mutual sliding process will also flow with the grease. The iron powder is gradually adsorbed on the groove 211 at the slope 21 and no longer follows the grease flow. Because the number and frequency of iron powder participating in the circulation are reduced, the circulation efficiency of the grease is improved under the same guide pillar 1 pushing force. Because the initial color of the grease is milky white or ivory white, the transparent oil pipe 23 can clearly observe the color change of the grease. When the color of the grease becomes darker, it means that the grease contains more impurities. This can be used as a basis for replacing the grease and cleaning the guide pillar 1 and the guide sleeve 2. For example, a color chart is set up, and the color of the grease is divided into 7 color scales from light to dark. 1 is the color when it is new, and 7 is the color when it must be replaced due to excessive oxidation or too many impurities. Specific embodiment two:

[0050] Referring to Figure 2 and Figure 3 As shown in the actual production process, many guide posts 1 and guide sleeves 2 are actually difficult to use standard matching grease continuously, and often use other equipment used lubricating oil or WD-40 such as metal maintenance agent, these liquid lubricating material viscosity low flow strong, easy to fill flow in visual observer, through the visual observer can be intuitive judgment guide sleeve 2 inside the lubrication working condition, liquid lubricating material guide sleeve 2 inside the working principle and and grease in embodiment one working principle is the same, can refer to embodiment one, the lubricating material for liquid when guide post 1 and guide sleeve 2, transparent U-shaped observation tube 27 is used to observe the lubricating material in guide sleeve 2 liquid level and lubricating material working condition, according to the principle of communicating vessels, when the equipment is not running, the liquid level of lubricating material in U-shaped observation tube 27 and the liquid level of lubricating material in guide sleeve 2 are consistent, when guide post 1 enters guide sleeve 2, guide post 1 will push the lubricating material in guide sleeve 2 to the right, at this time, the liquid level in observation tube 27 can be observed to rise, when guide post 1 is separated from guide sleeve 2, guide post 1 will pull the lubricating material in guide sleeve 2 to the left, at this time, the liquid level in observation tube 27 can also be observed to drop, in order to ensure the safety of operation, the operator cannot observe the liquid level change in observation tube 27 when the equipment is running, the three-prism lens 28 installed on the observation tube 27 can be used as a magnifying glass, and the shape of the mercury thermometer is the same, which can facilitate the operator to clearly observe the liquid level change in observation tube 27 in a relatively safe position, at the same time, since the iron powder has a large density, the color of the lubricating material in the U-shaped observation tube 27 can be observed, for example, a colorimetric card is set, the color of the lubricating material is divided into 7 color degrees from light to dark, 1 is the color when it is new, 7 is the color when the content of iron powder and other impurities is too much and must be replaced, the amount of iron powder settled in the U-shaped observation tube 27 is determined, for example, several scales are set on the vertical height of the U-shaped observation tube 27, through the liquid level in the U-shaped observation tube 27, when the liquid level in the U-shaped observation tube 27 is lower than the inner wall of guide sleeve 2, the lubricating material needs to be added.

Claims

1. An injection mold for a photoelectric switch housing, comprising: The injection mold for the photoelectric switch housing is placed horizontally. The punch is equipped with multiple guide posts; The die cavity, on which multiple guide sleeves are mounted, is characterized by further comprising: The uneven wear lubrication device is installed in each guide sleeve. During the process of the guide post entering the guide sleeve, the uneven wear lubrication device transfers the lubricating material in the guide sleeve from the bottom wall to the top wall of the guide sleeve. The wear lubrication device includes an oil passage opened on the right side wall of the guide sleeve, the oil passage connecting the inner bottom wall of the guide sleeve and the upper wall of the guide sleeve, an oil pipe installed on the upper wall of the guide sleeve, the oil pipe connecting to the oil passage, and multiple nozzles penetrating the upper top wall of the guide sleeve, all of which are connected to the oil pipe. The nozzle is conical in shape, with a smaller diameter near the inner wall and a larger diameter near the outer wall. Each nozzle is equipped with a miniature one-way valve. The tubing is made of a flexible, transparent material; The guide sleeve is provided with a cavity structure for accommodating lubricating material, and the cavity structure is located at the position of lowest potential energy on the inner wall of the guide sleeve. The cavity structure includes a downward sloping slope on the inner wall of the guide sleeve away from the opening of the guide sleeve. The opening of the oil passage on the right side wall of the guide sleeve is located at the lowest point of the slope. The slope is provided with a groove for collecting iron powder. A magnetic block is provided on the outside of the guide sleeve corresponding to the groove. The guide sleeve is equipped with a visual observation device, which includes a bottom channel located at the lowest potential energy position of the inner wall slope and extending downward through the lower inner wall. A transparent U-shaped observation tube is installed on the lower bottom wall of the guide sleeve, and the observation tube is connected to the bottom channel. The end of the observation tube that is not connected to the guide sleeve is provided with a switchable air hole. A triangular lens is installed on the rod part of the observation tube away from the guide sleeve. The lubricating material is grease or liquid.

2. The photoelectric switch housing injection mold according to claim 1, characterized in that: A sealing ring is installed on the guide post.

3. The injection mold for a photoelectric switch housing according to claim 1, characterized in that: The guide pillars and guide sleeves are equipped with throttling devices to reduce the loss of lubricating material.

4. The photoelectric switch housing injection mold according to claim 3, characterized in that: The throttling device includes an annular adsorption band installed on the end face of the guide post near the guide sleeve, and an annular scraper installed at the opening on the left side of the guide sleeve.

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