A device for detecting the thickness of an oil film in an injection molding machine

Abstract

The utility model discloses a detection device of oil film thickness in injection molding machine belongs to injection molding machine field, including the oil cylinder of being placed in the articulated place of two connecting rods on injection molding machine, two rotating sleeves, respectively rotatable sleeve sets up in the outer wall of oil cylinder to be connected with two connecting rods inner wall on injection molding machine respectively, and the rotatable connection of bearing is realized between rotating sleeve and oil cylinder, and the oil outlet hole of being located in rotating sleeve inside is seted up in the outer wall of oil cylinder, one -way oil injection nozzle, inlaying sets up in the one end of oil cylinder, liquid level detection sensor, the detection device of oil film thickness in injection molding machine of the utility model, through the liquid level detection sensor detects the indirect reflection oil film relevant state of lubricating paste liquid level, has solved the problem that oil film thickness direct detection is difficult, liquid level detection sensor adopts detachable connection mode, and combines the design of damping sleeve, is convenient for later maintenance and can avoid the resonance interference, has improved the practicality and detection accuracy of device, has provided the powerful guarantee for the efficient, stable operation of injection molding machine.

Description

Technical Field

[0001] This utility model belongs to the field of injection molding machines, and specifically relates to a device for detecting the thickness of oil film in an injection molding machine. Background Technology

[0002] In the field of injection molding machines, the motion performance (such as mold opening and closing speed and cycle), energy consumption level and operational stability of three-platen injection molding machines are closely related to the friction performance between connecting rod components. The friction performance between connecting rod components depends on the oil film thickness between adjacent connecting rods or between the connecting parts and the connecting rod components between the connecting rod and the injection molding parts. When the oil film thickness decreases, the lubrication performance will drop significantly, directly leading to increased friction, increased energy consumption, prolonged mold opening and closing cycle, and reduced machine operational stability.

[0003] However, the oil film itself is extremely thin and is located in the sealed space between the inner side of the connecting rod component and the outer side of the copper sleeve. Traditional detection methods cannot directly and efficiently obtain oil film thickness information, which poses a great challenge to the maintenance and performance optimization of injection molding machines. To solve the above problems, a detection device for oil film thickness in injection molding machines is proposed. Utility Model Content

[0004] In response to one or more of the above-mentioned defects or improvement needs of the existing technology, this utility model provides a device for detecting the oil film thickness in an injection molding machine. It aims to solve the problems of difficulty in detecting the oil film thickness in traditional injection molding machines, inconvenient maintenance, and susceptibility to resonance interference. The device enables convenient detection of the oil film condition, easy maintenance, and improved detection accuracy, thereby ensuring the efficient and stable operation of the injection molding machine.

[0005] To achieve the above objectives, this utility model provides a device for detecting the thickness of oil film in an injection molding machine, including an oil cylinder installed at the hinge of two connecting rods on the injection molding machine; Two rotating sleeves are rotatably mounted on the outer wall of the oil cylinder and are respectively connected to the inner walls of two connecting rods on the injection molding machine; the rotating sleeves and the oil cylinder are rotatably connected by bearings. An oil outlet hole located inside the rotating sleeve is provided on the outer wall of the oil cylinder; A one-way oil injection nozzle is embedded at one end of the oil cylinder; The liquid level detection sensor is detachably mounted on the outer wall of the other end of the oil drum and inserted into the oil drum.

[0006] Furthermore, the outer wall of the other end of the oil cylinder has a protrusion; a threaded sleeve is fitted on the outer wall of the liquid level detection sensor, and the threaded sleeve is screwed into the protrusion to enable a detachable connection between the liquid level detection sensor and the oil cylinder.

[0007] Furthermore, a shock-absorbing sleeve is provided between the liquid level detection sensor and the screw sleeve.

[0008] Furthermore, the shock-absorbing sleeve is made of rubber.

[0009] Furthermore, the oil outlet holes are evenly distributed along the circumference of the outer wall of the oil cylinder, and the number of oil outlet holes is 4-6.

[0010] Furthermore, the output end of the one-way oil nozzle extends to the middle section inside the oil cylinder, and a sealing gasket is provided at the connection between the one-way oil nozzle and the oil cylinder.

[0011] Furthermore, the oil drum is made of stainless steel, and the inner wall of the oil drum is coated with an anti-corrosion coating. The detection end of the liquid level detection sensor is wrapped with a wear-resistant protective sleeve, and the wear-resistant protective sleeve is made of polytetrafluoroethylene.

[0012] In summary, the beneficial effects of the above-described technical solutions conceived by this utility model compared with the prior art include: This invention relates to an oil film thickness detection device for injection molding machines. By detecting the lubricant level through a liquid level sensor, the device indirectly reflects the oil film's condition, solving the problem of direct oil film thickness detection. The liquid level sensor features a detachable connection and a shock-absorbing sleeve design, facilitating future maintenance and preventing resonance interference. This enhances the device's practicality and detection accuracy, providing a strong guarantee for the efficient and stable operation of the injection molding machine. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic cross-sectional view of the present invention. Figure 3 This is a schematic diagram of an embodiment of the present invention during assembly and use.

[0014] In all the accompanying drawings, the same reference numerals denote the same technical features, specifically: 1. oil cylinder; 2. rotating sleeve; 3. bearing; 4. oil outlet; 5. one-way oil injection nozzle; 6. liquid level detection sensor; 7. protrusion; 8. threaded sleeve; 9. shock-absorbing sleeve. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model. Please see Figure 1-3 This utility model provides a device for detecting the thickness of oil film in an injection molding machine, including an oil cylinder 1 installed at the hinge of two connecting rods on the injection molding machine; used as a storage and supply carrier for lubricant. Two rotating sleeves 2 are rotatably mounted on the outer wall of the oil cylinder 1 and connected to the inner walls of two connecting rods on the injection molding machine. The rotating sleeves 2 rotate with the rotation of the connecting rods. The rotating sleeves 2 and the oil cylinder 1 are rotatably connected by bearings 3. The bearings 3 not only ensure the smooth rotation of the rotating sleeves 2 and provide support for the rotating sleeves 2, but also serve as the main target of the lubricant, reducing the friction between the rotating sleeves 2 and the oil cylinder 1 and indirectly ensuring the lubrication effect of the oil film. The outer wall of the oil cylinder 1 is provided with an oil outlet hole 4 located inside the rotating sleeve 2, so that the lubricating grease in the oil cylinder 1 can flow out under the action of gravity. This is the channel for the lubricating grease to flow from the oil cylinder 1 to the bearing 3 and enter the mating area between the rotating sleeve 2 and the bearing 3, so that the lubricating grease can continuously provide lubrication for the bearing 3, thereby ensuring the formation of an oil film and maintaining sufficient lubricating grease. When there is enough lubricating grease, it is easier for a stable oil film to form on the surface of the bearing 3. One-way grease nipple 5 is embedded at one end of oil cylinder 1, allowing lubricant to be injected into oil cylinder 1 from the outside only, preventing lubricant leakage in reverse and ensuring a stable supply of lubricant storage. The liquid level sensor 6 is detachably mounted on the outer wall of the other end of the oil cylinder 1 and inserted into the oil cylinder 1 to detect the liquid level of the lubricant in the oil cylinder 1. By monitoring the changes in liquid level, the consumption rate of the lubricant can be indirectly reflected. If the lubricant is consumed quickly, it indicates that the oil film replenishment demand is large, which indirectly reflects that the oil film thickness may be insufficient, and thus infers the consumption and thickness status of the oil film. Its "detachable" design facilitates later inspection, maintenance or replacement of the sensor, improving the convenience of device maintenance.

[0016] Specifically, refer to Figure 1-2 The outer wall of the other end of the oil cylinder 1 has a protrusion 7 and the inner wall has threads; the outer wall of the liquid level detection sensor 6 is fitted with a screw sleeve 8, which is screwed into the protrusion 7 to realize the detachable connection between the liquid level detection sensor 6 and the oil cylinder 1. The operation is simple and the sensor can be quickly disassembled and assembled during maintenance.

[0017] Specifically, refer to Figure 2 A damping sleeve 9 is provided between the liquid level detection sensor 6 and the screw sleeve 8. The damping sleeve 9 is made of rubber. The elastic properties of rubber enable it to effectively absorb and buffer the resonance during the operation of the connecting rod, so as to avoid the vibration of the liquid level detection sensor 6 caused by the resonance of the connecting rod from interfering with the detection results and to ensure the accuracy of the detection data.

[0018] Specifically, refer to Figure 2The oil outlet holes 4 are evenly distributed around the outer wall of the oil cylinder 1, and there are 4-6 oil outlet holes 4. The even distribution of the oil outlet holes 4 around the circumference allows the lubricating oil to seep evenly from the oil cylinder 1 into the gap between the bearing 3 and the rotating sleeve 2, avoiding uneven oil film thickness caused by insufficient local oil supply, ensuring sufficient lubrication of the friction surface at the hinge of the two connecting rods, and reducing wear or abnormal noise. The design of 4-6 oil outlet holes 4 can not only meet the lubricating oil demand when the bearing 3 rotates, but also avoid excessive loss and waste of lubricating oil due to excessively large hole diameter or insufficient oil supply due to excessively small hole diameter, thus affecting the formation of oil film, and achieving precise matching of oil supply.

[0019] Specifically, refer to Figure 2 The output end of the one-way grease nipple 5 extends to the middle section of the oil cylinder 1, and a sealing gasket is provided at the connection between the one-way grease nipple 5 and the oil cylinder 1. The extension of the output end of the one-way grease nipple 5 to the middle section of the oil cylinder 1 allows the injected lubricating oil to directly enter the core area of ​​the oil cylinder 1 and quickly diffuse to the entire space, avoiding the lubricating oil from accumulating only at the end of the oil cylinder 1 and failing to fully wet the oil outlet 4 due to the grease nipple being too shallow. The check valve function of the one-way grease nipple 5 can prevent the lubricating oil in the oil cylinder 1 from overflowing in the reverse direction. The sealing gasket at the connection further enhances the sealing performance, preventing lubricating oil from leaking from the gap between the one-way grease nipple 5 and the oil cylinder 1, while preventing external dust and impurities from entering the oil cylinder 1 and contaminating the lubricating oil, ensuring the cleanliness of the oil film.

[0020] Specifically, refer to Figure 2 The oil cylinder 1 is made of stainless steel, and its inner wall is coated with an anti-corrosion coating. The detection end of the level sensor 6 is covered with a wear-resistant protective sleeve made of polytetrafluoroethylene (PTFE). The stainless steel oil cylinder 1 itself has strong resistance to corrosion and mechanical impact. Combined with the anti-corrosion coating on the inner wall, it can prevent additives in the lubricating oil or environmental moisture from corroding the oil cylinder 1, thus extending its service life. The PTFE wear-resistant protective sleeve on the detection end of the level sensor 6 has an extremely low coefficient of friction and excellent wear resistance and chemical corrosion resistance. It can prevent the sensor detection end from directly contacting the inner wall of the oil cylinder 1 or tiny impurities in the lubricating oil, which would cause wear. This ensures that the sensor 6 can work stably for a long time and accurately detect the liquid level in the oil cylinder 1, which indirectly reflects the oil quantity status related to the oil film thickness. Under the high temperature, oil contamination, and mechanical vibration of the plastic machine's working environment, the above-mentioned material selection of the oil cylinder 1 and the protective design of the sensor 6 can keep the device's performance stable and reduce the frequency of maintenance.

[0021] Working principle During use, the oil cylinder 1 is in a relatively stationary state due to the pulling of the connecting wire of the liquid level detection sensor 6; while the two rotating sleeves 2 rotate synchronously with the two connecting rods of the injection molding machine. The rotating sleeves 2 are connected to the inner wall of the connecting rods, and the rotation of the connecting rods drives the rotating sleeves 2 to rotate around the oil cylinder 1. Under the influence of gravity, the lubricant in the oil cylinder 1 enters the internal space of the rotating sleeve 2 through the oil outlet 4 and adheres to the bearing 3. When the rotating sleeve 2 rotates, it will stick to the lubricant on the bearing 3 and spread the lubricant on the mating surfaces of the bearing 3, the rotating sleeve 2, and the oil cylinder 1, continuously providing lubrication for the bearing 3. When the oil film is formed and the lubricant is sufficient, it is easier for a stable oil film with a suitable thickness to form on the surface of the bearing 3. Meanwhile, the level detection sensor 6 continuously detects the level of lubricant in the oil cylinder 1: if the oil film thickness between the connecting rod components is insufficient, the consumption rate of lubricant will accelerate, more lubricant will need to be added to the oil film, and the rate of drop in the level in the oil cylinder 1 will also accelerate; if the oil film thickness is sufficient, the lubricant consumption is slow, and the level drop is gradual; by monitoring the rate and magnitude of the level change through the level detection sensor 6, the consumption of the oil film can be indirectly inferred, thereby reflecting whether the oil film thickness meets the requirements; In addition, the shock-absorbing sleeve 9 is made of rubber, which can effectively absorb the resonance during the operation of the connecting rod, prevent the vibration from being transmitted to the liquid level detection sensor 6, prevent resonance from interfering with the detection results, and ensure the accuracy of liquid level detection. When it is necessary to repair or replace the liquid level detection sensor 6, the screw sleeve 8 can be unscrewed to quickly disassemble the sensor, improving the convenience of maintenance.

[0022] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for detecting oil film thickness in an injection molding machine, characterized in that, Including an oil cylinder (1) installed at the hinge of two connecting rods on the injection molding machine; Two rotating sleeves (2) are rotatably mounted on the outer wall of the oil cylinder (1) and connected to the inner walls of two connecting rods on the injection molding machine respectively; the rotating sleeves (2) and the oil cylinder (1) are rotatably connected by bearings (3); An oil outlet (4) is provided on the outer wall of the oil cylinder (1) and located inside the rotating sleeve (2); A one-way oil injection nozzle (5) is embedded at one end of the oil cylinder (1); The liquid level detection sensor (6) is detachably mounted on the outer wall of the other end of the oil cylinder (1) and inserted into the oil cylinder (1).

2. The device for detecting oil film thickness in an injection molding machine according to claim 1, characterized in that, The outer wall of the other end of the oil cylinder (1) has a protrusion (7); the outer wall of the liquid level detection sensor (6) is fitted with a screw sleeve (8), which is screwed into the protrusion (7) to enable a detachable connection between the liquid level detection sensor (6) and the oil cylinder (1).

3. The device for detecting oil film thickness in an injection molding machine according to claim 2, characterized in that, A shock-absorbing sleeve (9) is provided between the liquid level detection sensor (6) and the screw sleeve (8).

4. The device for detecting oil film thickness in an injection molding machine according to claim 3, characterized in that, The shock absorber sleeve (9) is made of rubber.

5. The device for detecting oil film thickness in an injection molding machine according to claim 1, characterized in that, Oil outlet holes (4) are evenly distributed along the outer wall of the oil cylinder (1), and the number of oil outlet holes (4) is 4-6.

6. The device for detecting oil film thickness in an injection molding machine according to claim 1, characterized in that, The output end of the one-way oil nozzle (5) extends to the middle section inside the oil cylinder (1), and a sealing gasket is provided at the connection between the one-way oil nozzle (5) and the oil cylinder (1).

7. The device for detecting oil film thickness in an injection molding machine according to claim 1, characterized in that, The oil cylinder (1) is made of stainless steel. The inner wall of the oil cylinder (1) is provided with an anti-corrosion coating. The detection end of the liquid level detection sensor (6) is wrapped with a wear-resistant protective sleeve, and the wear-resistant protective sleeve is made of polytetrafluoroethylene.

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