A conveyor for logistics loading

Abstract

The present application relates to a kind of conveyor for logistics loading, belong to logistics technical field.The conveyor for logistics loading described in the present application includes slope belt conveyor, slope belt conveyor includes rack, conveying belt, rack is provided with the machine table surface for supporting the upper half of conveying belt, the surface of machine table surface is divided into multiple bearing units by long slit, the vibrator for applying high-frequency vibration to bearing unit is installed below bearing unit, the frequency of vibrator is greater than or equal to 2.7MHz.The conveyor for logistics loading can solve the slipping, sliding of the article on conveying belt, by setting bearing unit cooperates vibrator to apply high-frequency vibration to bearing unit, to improve the friction between article and conveying belt, delay the sliding speed of article, until finally make the article stop sliding, avoid the article and other articles collide again, to improve safety.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of logistics, in particular to a conveyor for logistics loading. BACKGROUND

[0002] The slope belt conveyor is a commonly used device in the field of logistics, and is usually used for the inclined transmission and conveying of articles. The slope belt conveyor mainly relies on the friction between the articles and the conveying belt to convey the articles upward to a designated position.

[0003] In the field of logistics, the surface of an article with a hard surface (such as wood, plastic texture, metal texture, etc.) is generally smooth. The friction between such an article and the conveying belt is small. Once the slope of the slope belt conveyor is large, the smoothness of the surface of the conveying belt covered with rubber changes (for example, the surface properties change due to aging or untightening of the conveying belt), or the instantaneous impact force on the article is too large due to the change in the speed of the conveying belt, etc., the article being conveyed upward may suddenly slip between the article and the conveying belt, causing the article to suddenly move downward relative to the conveying belt. Once this happens, even if the slope belt conveyor is immediately stopped, the slipping article may continue to move downward, causing a collision with another article below it. In severe cases, even all other articles below the article may also collide on a large scale, causing damage to the surface of the article. Therefore, it is necessary to improve this situation. SUMMARY

[0004] The present application provides a conveyor for logistics loading to solve the problems in the prior art.

[0005] A conveyor for logistics loading includes a slope belt conveyor, the slope belt conveyor includes a rack and a conveying belt, the rack is provided with a table surface for supporting the upper half of the conveying belt, and the table surface is inclined; a plurality of long slits are arranged on the surface of the table surface along the length direction of the table surface, the surface of the table surface is divided into a plurality of bearing units by the long slits, a vibrator for applying high-frequency vibration to the bearing unit is installed below the bearing unit, and the frequency of the vibrator is greater than or equal to 2.7 MHz.

[0006] As a further scheme of the present application, the vibrator is provided with two megasonic transducers, and the two megasonic transducers are distributed along the width direction of the table surface; arc-shaped slit groups are arranged on both sides of the bearing unit, and the two arc-shaped slit groups are arranged in axial symmetry along the width direction of the table surface; each arc-shaped slit group is composed of at least three arc-shaped slits; and the arc length of the arc-shaped slit is arranged in a decreasing order in the direction away from the vibrator in the arc-shaped slit group.

[0007] As a further scheme of the present application, when the hardness of the surface covering rubber of the conveyor belt is 55-63 Shore A, the frequency of the two megasonic transducers during operation is a fixed value, 2.73-2.76 MHz, and the power density of the two megasonic transducers during operation is a fixed value.

[0008] As a further scheme of the present application, when the hardness of the surface covering rubber of the conveyor belt is 67-71 Shore A, the frequency of the two megasonic transducers during operation is a fixed value, 3.15 MHz; the power density of the two megasonic transducers during operation is periodically changed synchronously, and in one period, the power density is linearly increased.

[0009] As a further scheme of the present application, when the hardness of the surface covering rubber of the conveyor belt is 72-75 Shore A, the frequency of the two megasonic transducers during operation is a fixed value, 4.46 MHz; the power density of the two megasonic transducers during operation is periodically changed synchronously, and in one period, the power density is linearly increased.

[0010] As a further scheme of the present application, the length direction of the long slit is parallel to the width direction of the machine table.

[0011] As a further scheme of the present application, the inclined belt conveyor further comprises a driving drum, a motor for driving the driving drum to rotate, and a driven drum, and the conveyor belt moves through cooperation of the driving drum and the driven drum.

[0012] As a further scheme of the present application, a tension adjusting device for adjusting the tension of the conveyor belt is further installed between the driven drum and the machine frame, the tension adjusting device comprises guide rods installed at both ends of the driven drum, and a sliding sleeve in sliding connection with the guide rods, the sliding sleeve is fixedly connected with the machine frame, the guide rods and the sliding sleeve are fixed through setting bolts, and the guide rods and the rotating shaft of the driven drum are rotatably connected through an installed bearing.

[0013] As a further scheme of the present application, the conveyor for logistics loading further comprises a visual monitoring module, the visual monitoring module comprises:

[0014] An image acquisition module: using a camera to take pictures of the conveyor belt and the articles thereon at a fixed position;

[0015] An article detection and positioning module: identifying the articles in the image and determining their positions;

[0016] An article tracking module: associating the same article in consecutive frames;

[0017] Speed calculation module: according to the displacement of the article in the continuous frame and the known inter-frame time interval, the moving speed of the article is calculated.

[0018] As a further aspect of the present application, if the visual monitoring module identifies that the upward movement speed of the article on the conveying belt is less than a predetermined threshold value, or the movement direction of the article on the conveying belt changes to downward movement, the corresponding vibrator of the bearing unit below the article position is started during the upward movement of the conveying belt.

[0019] Compared with the prior art, the present application has the following beneficial effects:

[0020] The logistics loading conveyor can solve the problem that when the article on the conveying belt slips or falls, the high-frequency vibration is applied to the bearing unit by the vibrator cooperating with the bearing unit, so as to improve the friction between the article and the conveying belt, delay the falling speed of the article, and finally stop the article from falling, so as to avoid the collision between the article and other articles, thereby improving the safety. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 The present application is a schematic diagram of the structure of the logistics loading conveyor.

[0022] Figure 2 The present application is a schematic diagram of the side view of the inclined belt conveyor.

[0023] Figure 3 The present application is a schematic diagram of the top view of the inclined belt conveyor.

[0024] Figure 4 The present application is a schematic diagram of the bearing unit and the vibrator after installation from the bottom.

[0025] Figure 5 The present application is a schematic diagram of the arc-shaped seam in case 5. DETAILED DESCRIPTION

[0026] The present application will be described in detail below in combination with specific embodiments. The embodiments described below are only a part of the embodiments of the present application, but not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0027] Example 1

[0028] As Figures 1-3As shown, a logistics loading conveyor includes an inclined belt conveyor 10. The inclined belt conveyor 10 includes a frame 11 and a conveyor belt 12. The frame 11 is provided with a platform for supporting the upper half of the conveyor belt 12, and the platform is inclined. The inclined belt conveyor 10 also includes a drive roller 17, a motor 14 for driving the drive roller 17 to rotate, and a driven roller 13. The conveyor belt 12 moves through the cooperation of the drive roller 17 and the driven roller 13. The above content is the conventional structure of existing inclined belt conveyors, and the relevant principles will not be described in detail.

[0029] The key improvements of this invention are as follows:

[0030] like Figures 2-4 As shown, the surface of the machine table is provided with a plurality of long strips 111 along the length of the machine table, and the surface of the machine table is divided into a plurality of bearing units 112 by the long strips 111. A vibrator 30 for applying high-frequency vibration to the bearing unit 112 is installed below the bearing unit 112, and the frequency of the vibrator 30 is greater than or equal to 2.7MHz.

[0031] As is generally known, the friction between an object and a conveyor belt depends primarily on: the roughness of the contact surfaces of the two objects and the magnitude of the normal force; more microscopically, it depends on: the attractive forces (adhesive forces) between atoms and molecules on the solid surface and the degree of mechanical interlocking caused by the surface roughness between them.

[0032] In this invention, firstly, the high-frequency vibration of this invention has a very small amplitude; it is megaphonic vibration, with an amplitude smaller than that of ultrasonic vibration, and a vibration frequency higher than that of ultrasonic vibration.

[0033] Secondly, the independently configured bearing unit 112 is mainly affected when subjected to high-frequency vibration of the corresponding oscillator 30, and has little impact on other bearing units 112 in the vicinity.

[0034] Finally, in the high-frequency vibration, on the one hand, in theory, the generated vibration may impact the surface of the hard object, under the action of the force and the reaction force, the positive pressure will have a slight amplitude change, in some stages, the positive pressure will increase; in addition, in the case of high-frequency vibration, it may promote the surface of the conveying belt to cover the rubber to better wrap the contact point of the surface of the object, so that the mechanical engagement degree of both sides is better; therefore, under the action of multiple factors, the effect of high-frequency vibration can theoretically increase the friction. In the present application, once the object being conveyed upwards slips between the conveying belt (which can be manually observed whether it slips or automatically monitored by visual monitoring technology), the vibrator 30 corresponding to the bearing unit 112 below the slipping object area is immediately started, and under the action of high-frequency vibration generated by the vibrator 30, once the object slips to the high-frequency vibration area, the high-frequency vibration will change the interfacial properties of the surface of the conveying belt covered with rubber, so that the friction between the conveying belt in this area and the object will be relatively larger, thereby delaying the slipping speed of the object that is slipping, until the object eventually stops slipping, avoiding collision with other objects again, thereby improving safety.

[0035] It should be noted that the single bearing unit 112 under the action of high-frequency vibration generated by the vibrator 30 does not necessarily immediately stop the object from slipping, and more bearing units 112 below may be needed to cooperate with the vibrator 30 to achieve the purpose of stopping the object from slipping. In addition, if the slipping situation is particularly serious (such as the inclination of the machine table is too large, for example, reaching 45°, etc.), the final result may only be to slow down the slipping speed, and eventually a collision will occur, but the damage degree will be reduced. In addition, the present application is not suitable for objects with non-hard surfaces (such as objects with a layer of carton / foam box packaging on the surface); such objects with non-hard surfaces are generally not prone to slipping because their friction coefficient is generally relatively large.

[0036] In some embodiments, the length direction of the long slit 111 is parallel to the width direction of the machine table; such arrangement can better manage and control.

[0037] Embodiment 2

[0038] After long-term use, the conveying belt 12 can be aged, especially in the case of high-frequency vibration of the conveying belt 12 of the present application, the surface covering rubber of the conveying belt 12 ages faster, and the interface performance also changes. Therefore, a tension adjusting device for adjusting the tension of the conveying belt 12 is further arranged between the driven roller 13 and the frame 11, the tension adjusting device comprises guide rods 15 arranged at both ends of the driven roller 13, a sliding sleeve 16 in sliding connection with the guide rods 15, the sliding sleeve 16 is fixedly connected with the frame 11, the guide rods 15 and the sliding sleeve 16 are fixed by a bolt fastener, and the guide rods 15 and the rotating shaft of the driven roller 13 are rotatably connected by a bearing.

[0039] In the embodiment, the middle section of the guide rod 15 is a smooth section (for sliding connection with the sliding sleeve 16), and the two ends thereof can be threaded sections for threaded connection with nuts.

[0040] When it is necessary to adjust the tension of the conveying belt 12, the bolt fastener is loosened, the distance between the driven roller 13 and the frame 11 is adjusted, and thus the tension is adjusted.

[0041] Embodiment 3

[0042] In the embodiment 1, the vibrator 30 is provided with two megasonic transducers, and the two megasonic transducers are distributed along the width direction of the machine table surface; the two sides of the bearing unit 112 are respectively provided with arc-shaped slit groups, and the two arc-shaped slit groups are arranged in axial symmetry along the width direction of the machine table surface; the arc-shaped slit group is composed of at least three arc-shaped slits 113; in the arc-shaped slit group, the arc lengths of the arc-shaped slits 113 are arranged in a decreasing order from the direction away from the vibrator 30.

[0043] The hardness of the conveying belt 12 mainly refers to the hardness of the covering rubber (generally made of rubber). The measurement standard is usually measured by using a Shore A hardness tester, and the unit is degree (Shore A).

[0044] Generally, the hardness of the covering rubber of the general conveying belt is usually between 55° and 70° Shore A. The hardness of the wear-resistant conveying belt is usually higher, and is usually around 65°-75° Shore A.

[0045] It is known that the hardness of rubber is mainly determined by the crosslinking density, and the crosslinking density is realized and adjusted by the vulcanization system and the filling system. For the covering rubber on the surface of the conveying belt, the vulcanization degree is almost the same, and the type and content of the filler can cause obvious changes in the hardness. Based on this fact, it is found in the test that the hardness of the covering rubber on the surface of the conveying belt has a great influence on the friction in the high-frequency vibration environment.

[0046] Case 1: when the hardness of the conveyor belt surface covering rubber is 55°-63° Shore A, the frequency of the two megasonic transducers in operation is a fixed value, 2.73-2.76 MHz, and the power density of the two megasonic transducers in operation is a fixed value, 3.2 W / cm2.

[0047] Case 2: when the hardness of the conveyor belt surface covering rubber is 67°-71° Shore A, the frequency of the two megasonic transducers in operation is a fixed value, 3.15 MHz; the power density of the two megasonic transducers in operation is synchronous and periodic, in a period, the power density is linearly increased and set in the range of 2.5-3.6 W / cm2, and the period T=10 s.

[0048] Case 3: when the hardness of the conveyor belt surface covering rubber is 72°-75° Shore A, the frequency of the two megasonic transducers in operation is a fixed value, 4.46 MHz; the power density of the two megasonic transducers in operation is synchronous and pulse-shaped, in a pulse period, the power density changes in the range of 2.1-3.9 W / cm2, and the pulse change waveform is bell-shaped, and the period T=10 s.

[0049] In the extreme simulation test of the application, a certain amount of water mist is sprayed on the surface of the conveyor belt by using a watering can to simulate the critical state of the goods being conveyed (the goods on the conveyor belt do not slide down when the conveyor belt is uniformly conveyed at a forward speed of 0.55 m / s; but when the forward speed of the conveyor belt is switched from 0.55 m / s to 0.5 m / s, the goods on the conveyor belt immediately slide down due to the impact of inertia), so as to test the influence of high-frequency vibration on the application. In this case, if the vibrator 30 is started, the sliding goods can finally stop sliding, which indicates that the extreme simulation test is passed.

[0050] In this embodiment, cases 1-3 are all tested by extreme simulation.

[0051] However, it is found in the test that if the megasonic transducer in the vibrator 30 is replaced by an ultrasonic transducer, the ultrasonic frequency is changed within 20-100 kHz, and the power density of the ultrasonic transducer is changed between 0.2-10 W / cm2, it is found that it does not pass the extreme simulation test. The reason may be that the amplitude of ultrasonic vibration is too large, and the vibration amplitude is relatively large, which will cause the goods being slid to slide faster, and cannot achieve the purpose of delaying the sliding. The ultrasonic transducer and the megasonic transducer are both purchased from Shenzhen Lv Yuanxuan Electronic Technology Co., Ltd.

[0052] In the present application, the technical difficulty is that: because the material of the surface covering rubber of the conveying belt is similar, the resonance frequency may be slightly different due to different hardness, different positions, different extrusion degrees and other factors. Therefore, through a large number of tests, it is found that there may be multiple resonance frequency points. Tests have found that near the resonance frequency point, the surface covering rubber of the conveying belt is more likely to wrap the contact point on the surface of the article, promoting the formation of better mechanical engagement; however, in order to meet the universality, the vibrator 30 cannot be frequently replaced, and can only adjust the output power density frequently, and the power density will affect the "intensity" of high-frequency vibration; if the power density is too small, it will lead to poor effect of delaying the sliding of the article; if the power density is too large, the high-frequency vibration will instead cause the article that is sliding to accelerate. For different hardness of the covering rubber, the influence on high-frequency vibration is different. Therefore, how to find a suitable resonance frequency and find a suitable power density at the resonance frequency point is the key and difficulty of the present application.

[0053] Case 4: As a control to case 1, if the bearing unit 112 has no hollow design (no arc-shaped seam 113), it is a whole plate; it is found that it cannot pass the extreme simulation test. The reason may be that the arc-shaped seam 113 with a special direction can transmit the vibration waveform to the articles on the conveying belt 12 in a certain direction.

[0054] Case 5: As a control to case 1, if the two groups of arc-shaped seams of the bearing unit 112 are arranged in axial symmetry along the length direction of the machine table surface, as shown in Figure 5 , it is found that it cannot pass the extreme simulation test. The reason may be that the direction of the arc-shaped seam 113 of this group is different, and the generated vibration waveform promotes the articles on the conveying belt 12 to slide faster.

[0055] Case 6: As a control to case 1, when the hardness of the surface covering rubber of the conveying belt is 55° Shore A, the power density of the two megasonic transducers when working is a fixed value, which is 3.2 W / cm²; but the frequency of the two megasonic transducers when working is a fixed value, which is 2.6 MHz, 2.8 MHz or 3 MHz, it is found that all of them cannot pass the extreme simulation test.

[0056] Case 7: As a control to case 2, when the hardness of the surface covering rubber of the conveying belt is 70° Shore A, the frequency of the two megasonic transducers when working is a fixed value, which is 3.15 MHz; the power density of the two megasonic transducers when working is a fixed value, and the power density is 2.5 W / cm², 2.7 W / cm², 3 W / cm², 3.5 W / cm² or 3.6 W / cm², it is found that all of them cannot pass the extreme simulation test.

[0057] Case 7: As a control to Case 3, when the hardness of the surface covering rubber of the conveyor belt is 75° Shore A, the frequency of the two megasonic transducers in operation is a fixed value, which is 4.46 MHz; the power density of the two megasonic transducers in operation is synchronously periodically changed, in a period, the power density is linearly increased in the range of 2.1-3.9 W / cm², and the period T = 10 s; it is found that the extreme simulation test cannot be passed.

[0058] Case 8: As a control to Case 3, when the hardness of the surface covering rubber of the conveyor belt is 75° Shore A, the frequency of the two megasonic transducers in operation is a fixed value, which is 4.46 MHz; the power density of the two megasonic transducers in operation is synchronously periodically changed, in a period, the power density is linearly increased in the range of 2.1-3.9 W / cm², and the period T = 10 s; it is found that the extreme simulation test cannot be passed.

[0059] From Cases 6-8, it can be seen that if the hardness of the surface covering rubber of the conveyor belt is different, the sensitivity of the megasonic transducers to the high-frequency vibration generated in operation is different, and it is necessary to cooperate with a specific frequency and a special power density to achieve the purpose of improving the friction between the articles and the conveyor belt.

[0060] Example 4

[0061] At present, the existing visual monitoring technology for identifying the speed of articles on the conveyor belt is a multi-step visual processing process combined with detection, tracking and speed calculation. The core idea is: first find the article, then track the displacement of the article, and finally calculate the speed according to the displacement and time difference.

[0062] A common method is as follows:

[0063] The logistics loading conveyor further comprises a visual monitoring module, and the visual monitoring module comprises:

[0064] An image acquisition module: uses a camera 20 (usually a global shutter) to take pictures of the conveyor belt 12 and the articles thereon at a fixed position; as shown in Figure 1 .

[0065] An article detection and positioning module: identifies the article in the image and determines its position (usually the center point or a certain feature point);

[0066] An article tracking module: associates the same article in consecutive frames;

[0067] A speed calculation module: calculates the moving speed of the article according to the displacement of the article in consecutive frames and the known inter-frame time interval.

[0068] For the application scenario of the present application: the article rules, background stability, speed requirement is not high, generally, the detection algorithm used by the article detection and positioning module is background subtraction method + Blob analysis method, the principle is: a "background model" not containing moving articles is established in advance, then the current frame is subtracted from the background model to obtain the foreground (moving articles). The principle of Blob analysis method is: after image binarization (foreground / background), the connected regions are analyzed, and the center coordinates, area, and circumscribed rectangle of each connected region (Blob) can be calculated. The tracking algorithm used by the article tracking module is a tracking algorithm based on overlap rate, which calculates the overlapping area of a detection box in the current frame and all detection boxes in the last frame, and considers that the two detection boxes with the largest overlapping area are the same article.

[0069] Therefore, in the process of real-time monitoring by the visual monitoring module:

[0070] If the visual monitoring module identifies that the upward movement speed of the article on the conveying belt is less than a predetermined threshold value (indicating that the article has slid downward to a certain extent), or the movement direction of the article on the conveying belt changes to downward movement, the vibrator 30 corresponding to the bearing unit 112 below the position of the article is started, thereby delaying the article that is sliding and reducing its sliding speed until it stops sliding.

[0071] In addition, it should be understood that those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that those skilled in the art can understand.

Claims

1. A logistics loading conveyor, comprising an inclined belt conveyor (10), the inclined belt conveyor (10) comprising a frame (11) and a conveyor belt (12), the frame (11) being provided with a platform for supporting the upper half of the conveyor belt (12), the platform being inclined, characterized in that: The surface of the machine table is provided with a plurality of long strips (111) along the length of the machine table. The surface of the machine table is divided into a plurality of bearing units (112) by the long strips (111). A vibrator (30) for applying high-frequency vibration to the bearing unit (112) is installed below the bearing unit (112). The frequency of the vibrator (30) is greater than or equal to 2.7MHz. The vibrator (30) is provided with two mega-sound transducers, both of which are distributed along the width direction of the machine table; the bearing unit (112) is provided with arc-shaped slot groups on both sides, and the two arc-shaped slot groups are arranged symmetrically along the width direction of the machine table; the arc-shaped slot group consists of at least three arc-shaped slots (113); in the arc-shaped slot group, the arc length of the arc-shaped slots (113) decreases sequentially in the direction away from the vibrator (30); When the hardness of the conveyor belt surface cover rubber is 55°~63° Shore A, the operating frequency of the two mega-sound transducers is a fixed value of 2.73~2.76MHz, and the power density of the two mega-sound transducers is also a fixed value. or, When the hardness of the conveyor belt surface cover rubber is 67°~71° Shore A, the operating frequency of the two mega-sound transducers is a fixed value of 3.15MHz; the power density of the two mega-sound transducers changes synchronously and periodically, and the power density increases linearly within one cycle. or, When the hardness of the conveyor belt surface cover rubber is 72°~75° Shore A, the operating frequency of the two mega-sound transducers is a fixed value of 4.46MHz; the power density of the two mega-sound transducers changes synchronously in a pulse-like manner, and the pulse change waveform of the power density is bell-shaped within one pulse cycle.

2. The conveyor for loading logistics according to claim 1, characterized in that: The length direction of the long slit (111) is parallel to the width direction of the machine table surface.

3. The conveyor for loading logistics according to claim 1, characterized in that: The inclined belt conveyor (10) also includes a drive roller (17), a motor (14) for driving the drive roller (17) to rotate, and a driven roller (13). The conveyor belt (12) moves in cooperation with the drive roller (17) and the driven roller (13).

4. A conveyor for loading logistics according to claim 3, characterized in that: A tension adjusting device for adjusting the tension of the conveyor belt (12) is also installed between the driven roller (13) and the frame (11). The tension adjusting device includes guide rods (15) installed at both ends of the driven roller (13) and sliding sleeves (16) slidably connected to the guide rods (15). The sliding sleeves (16) are fixedly connected to the frame (11). The guide rods (15) and the sliding sleeves (16) are fixed by setting bolt fasteners. The guide rods (15) and the shaft of the driven roller (13) are rotatably connected by installing bearings.

5. A conveyor for loading logistics according to claim 1, characterized in that: It also includes a visual monitoring module, which comprises: Image acquisition module: Uses camera (20) to photograph the conveyor belt (12) and the items on it at a fixed position; Item detection and localization module: Identifies items in an image and determines their location; Item tracking module: Associates the same item in consecutive frames; Speed ​​Calculation Module: Calculates the movement speed of an item based on its displacement in consecutive frames and the known inter-frame time interval.

6. A conveyor for loading logistics according to claim 5, characterized in that: As the items on the conveyor belt move upward with the conveyor belt, if the visual monitoring module identifies that the upward movement speed of the items on the conveyor belt is less than a predetermined threshold, or if the movement direction of the items on the conveyor belt changes to downward, the oscillator (30) corresponding to the bearing unit (112) below the item position is activated.

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