Self-aligning material conveying belt roller

Abstract

The application provides a self-adaptive centering material conveying belt roller, and belongs to the technical field of conveying equipment, which comprises a supporting shaft, a movable plate and a movable supporting strip. A center roller is arranged at the middle position of the supporting shaft, a plurality of insertion holes corresponding to the movable supporting strip are arranged on the center roller, a plurality of top rods connected with the movable supporting strip are slidably arranged in the insertion holes, and an expansion roller for driving the top rods to expand and contract is arranged in the center roller. The waist drum-shaped roller cylinder with adjustable diameter at the middle part is formed by arranging the expansion roller and the movable supporting strip, the diameter of the waist drum-shaped roller cylinder at the middle part is intelligently adjusted according to the deviation amplitude of the belt, unnecessary wear of the belt caused by a large diameter is avoided, and when the belt does not deviate, the movable supporting strip is in a flat state, at this time, the diameters of the roller cylinder at different positions are uniform, and local wear of the belt caused by different pressures in the normal conveying process is avoided.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of conveying equipment, and particularly relates to a self-adaptive centering material conveying belt roller. BACKGROUND

[0002] The belt roller is a core component of the belt conveying system and is composed of a roller, a bearing, a shaft and a sealing element, etc. The roller is usually made of steel, aluminum alloy or engineering plastic and has a surface treated specially to enhance wear resistance and friction. The roller is supported by the bearing to rotate stably, thereby providing continuous and stable support and guidance for the conveying belt and ensuring efficient and reliable conveying of materials in industrial production, logistics transportation and other scenarios, so that the belt roller is a key component for smooth operation of the entire conveying system.

[0003] In actual conveying process, the conveying belt often deviates. At present, the belt rollers at both ends of the belt conveyor are set as waist drum-shaped by setting the swingable deviation-correcting roller support outside the conveying path of the belt conveyor, so that when the belt deviates, the diameter difference between the middle part and the two ends of the roller surface will generate greater centripetal friction on the deviated side, thereby automatically pushing the belt back to the center position.

[0004] However, when the waist drum-shaped belt roller contacts with the belt, the convex structure of the waist drum-shaped belt roller makes the contact pressure of the belt and the center area of the roller surface greater, and the center line speed higher, resulting in greater friction of the middle area of the belt and easy wear. SUMMARY

[0005] In view of the above, in order to overcome the defects of the prior art, the purpose of the present application is to provide a self-adaptive centering material conveying belt roller to at least partially solve the problems raised in the background.

[0006] The technical scheme adopted by the present application is as follows: the present application provides a self-adaptive centering material conveying belt roller, which comprises:

[0007] A support shaft, both ends of which are provided with movable plates, the support shaft and the movable plates are coaxially arranged, and the movable plates are arranged to be able to slide along the axial direction of the support shaft;

[0008] A plurality of movable support strips are connected between the two movable plates and are uniformly distributed in the circumferential direction;

[0009] Among them, a center roller is arranged at the middle position of the support shaft, a plurality of insertion holes corresponding to the movable support strips are arranged on the center roller, a plurality of top rods connected with the movable support strips are slidably arranged in the insertion holes, and an expansion roller for driving the top rods to expand and contract is arranged in the center roller;

[0010] The movable support strips are arranged to be able to be bent outward by the top rods;

[0011] The support shaft (1) is provided with a distance measuring sensor at each end for detecting the position of the belt.

[0012] Further, the support shaft is fixedly provided with a fixed plate at each end, and a plurality of circumferentially uniformly distributed fixed support strips are connected between the two fixed plates, and the plurality of fixed support strips are located in the gap between adjacent two movable support strips.

[0013] Further, the cross sections of the movable support strips and the fixed support strips are all circular arcs with the same radius.

[0014] Further, the expansion roller comprises a sealing pipe and an air bag, the sealing pipe is arranged inside the center roller, the center roller and the sealing pipe are coaxially arranged, the air bag is wrapped outside the sealing pipe, and one end of the ejector rod located inside the center roller is connected to the air bag.

[0015] Further, the outer diameter of the sealing pipe is smaller than the inner diameter of the center roller, so that an annular gap for the air bag to expand is formed between the center roller and the sealing pipe.

[0016] Further, the support shaft is arranged in a tubular structure with one end open and the other end closed, the open end of the support shaft is connected to the air supply device, a first air hole is arranged at the middle position of the support shaft and communicates with the inside of the sealing pipe, and a second air hole is arranged on the sealing pipe and communicates with the inside of the air bag.

[0017] Further, the open end of the support shaft is provided with a gas slip ring, and the open end of the support shaft is connected to the air supply device through the gas slip ring.

[0018] Further, the two ends of the movable support strip are both provided with an elastic connecting piece, and the movable support strip is connected to the movable plate through the elastic connecting piece.

[0019] Further, the two ends of the support shaft are both provided with a baffle, and a spring is connected between the baffle and the movable plate.

[0020] Further, a bracket is arranged below the support shaft, the two ends of the bracket are both provided with a bearing, and the two ends of the support shaft are connected to the bracket through the bearing.

[0021] Beneficial effects:

[0022] 1. By setting the air bag and the movable support strip, the waist drum-shaped roller with adjustable diameter in the middle is formed, the waist drum-shaped roller diameter in the middle is adjusted according to the deviation amplitude of the belt, unnecessary wear of the belt caused by a larger diameter is avoided, and when the belt does not deviate, the movable support strip is in a flat state, at this time, the diameter of the roller is uniform, and local wear caused by different pressures during normal conveying of the belt is avoided.

[0023] 2. By setting the distance measuring sensor and the control unit, the distance measuring sensor is used to detect the position of the belt in real time, the control unit automatically controls the inflation of the air supply equipment to the air bag according to the detection result, realizes automatic deviation correction, and according to the deviation amount of the belt detected by the distance measuring sensor, the inflation amount of the air supply equipment to the air bag is intelligently adjusted to realize deviation correction of different amplitudes. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 A structure diagram of a self-adaptive centering material conveying belt roller is provided for the embodiment of the present application.

[0025] Figure 2 A state diagram of the movable support strip being bent in a self-adaptive centering material conveying belt roller is provided for the embodiment of the present application.

[0026] Figure 3 An installation position diagram of the fixed plate and the fixed support strip in a self-adaptive centering material conveying belt roller is provided for the embodiment of the present application.

[0027] Figure 4 A position diagram of the jack in a self-adaptive centering material conveying belt roller is provided for the embodiment of the present application.

[0028] Figure 5 An internal structure diagram of the center roller in a self-adaptive centering material conveying belt roller is provided for the embodiment of the present application.

[0029] Figure 6 A sectional view of a self-adaptive centering material conveying belt roller is provided for the embodiment of the present application.

[0030] Figure 7 A Figure 6 An enlarged diagram of A in the middle.

[0031] Figure 8 An installation position diagram of the distance measuring sensor in a self-adaptive centering material conveying belt roller is provided for the embodiment of the present application.

[0032] Wherein, 1, support shaft; 11, movable plate; 12, movable support strip; 13, fixed plate; 14, fixed support strip; 15, baffle; 16, spring; 101, first air hole; 2, center roller; 21, top rod; 22, sealing tube; 23, air bag; 201, jack; 202, second air hole; 203, annular gap; 3, air slide ring; 4, bracket; 5, elastic connecting piece; 6, distance measuring sensor.

[0033] The accompanying drawings are used to provide further understanding of the embodiments, and constitute a part of the specification, which are used to explain the embodiments together with the embodiments, and do not constitute a limitation on the embodiments. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection.

[0035] In the description of the embodiments, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments.

[0036] In combination with Figure 1 The embodiments of the present application provide a self-adaptive centering material conveying belt roller, which comprises a support shaft 1, a movable plate 11 and a movable support strip 12.

[0037] The movable plate 11 is provided with two, and the two movable plates 11 are respectively arranged at both ends of the support shaft 1, and the support shaft 1 and the movable plate 11 are coaxially arranged.

[0038] Specifically, the movable plate 11 is a sliding sleeve arranged outside the support shaft 1, so that the movable plate 11 can slide along the axial direction of the support shaft 1.

[0039] It should be noted that the movable plate 11 and the support shaft 1 are connected by key-key groove connection, so that the movable plate 11 can only slide along the axial direction of the support shaft 1, and the movable plate 11 and the support shaft 1 cannot rotate relative to each other.

[0040] A plurality of movable support strips 12 are connected between the two movable plates 11, and the plurality of movable support strips 12 are evenly distributed along the circumference of the movable plate 11 to form a hollow cylindrical structure for mounting the belt.

[0041] Furthermore, a bracket 4 is provided below the support shaft 1, and bearings are provided at both ends of the bracket 4. The two ends of the support shaft 1 are connected to the bracket 4 through the bearings, and the bracket 4 supports the support shaft 1.

[0042] Combination Figure 4 and Figure 6 As shown, a central roller 2 is provided at the middle position of the support shaft 1. The central roller 2 is provided with multiple insertion holes 201 corresponding to the movable support bar 12, and the insertion holes 201 correspond to the middle position of the movable support bar 12. Each insertion hole 201 is slidably connected to a push rod 21 connected to the movable support bar 12. An expansion roller is provided inside the central roller 2 for driving the push rod 21 to extend and retract. Through the expansion of the expansion roller, the push rod 21 can be pushed outward along the insertion hole 201.

[0043] Thus, by utilizing the expansion of the expansion roller, the push rod 21 slides outward along the insertion hole 201, thereby bending the movable support bar 12 outward from the middle position, causing the movable support bar 12 to be bent into a centrally protruding arc shape (such as...). Figure 6 As shown), multiple circumferentially distributed movable support bars 12 are bent to form a waist-shaped roller that is thicker in the middle and thinner at both ends (as shown). Figure 2 As shown, by utilizing different diameters, a pressure difference is generated in the belt during operation. The pressure difference is used to enable the belt to self-correct. By controlling the bending amplitude of the movable support bar 12, the diameter of the middle part of the waist drum-shaped roller is adjusted. The larger the diameter, the greater the pressure difference generated by the belt and the faster the correction speed, which is suitable for large-amplitude belt correction. The smaller the diameter, the smaller the pressure difference generated by the belt and the slower the correction speed, which is suitable for small-amplitude belt correction.

[0044] Combination Figure 2 , Figure 3 and Figure 4 As shown, fixed plates 13 are fixed at both ends of the support shaft 1. Multiple circumferentially evenly distributed fixed support bars 14 are connected between the two fixed plates 13. The multiple fixed support bars 14 are located in the gap between two adjacent movable support bars 12. The width of the fixed support bar 14 is the same as the gap width between the two movable support bars 12. The cross-sections of the movable support bars 12 and the fixed support bars 14 are both set as arcs with the same radius.

[0045] Therefore, when the movable support bar 12 is in an unbent state (the movable support bar 12 is in a straight state), the movable support bar 12 and the fixed support bar 14 can form a roller with a complete surface (such as...). Figure 1 As shown in the figure, this reduces wear on the conveyor belt.

[0046] Thus, when the conveying belt is not deviated, the expansion roller is in the unexpanded state, and the jacks 21 are retracted in the insertion holes 201, at this time, the movable support strips 12 are in the un-bent state, and the movable support strips 12 and the fixed support strips 14 can form a complete roller barrel; when the conveying belt is deviated, the expansion of the expansion roller synchronously pushes the jacks 21 out of the insertion holes 201, and the jacks 21 bend the movable support strips 12 outwards, so that the movable support strips 12 are bent to the middle convex arc shape, and the plurality of bent movable support strips 12 form a waist drum-shaped roller barrel (as shown in Figure 2 The diameter difference causes a pressure difference in the conveying process of the belt, so that the conveying belt is self-adapted to be corrected.

[0047] When the deviation of the conveying belt is small, the expansion roller is expanded with a small amplitude, and the jacks 21 bend the movable support strips 12 with a small amplitude, at this time, the diameter difference between the middle and the two ends of the waist drum-shaped roller barrel is small, and the pressure difference caused in the conveying process of the conveying belt is also small, so that the conveying belt can be corrected with a small amplitude; when the deviation of the conveying belt is large, the expansion roller is expanded with a large amplitude, and the jacks 21 bend the movable support strips 12 with a large amplitude, at this time, the diameter difference between the middle and the two ends of the waist drum-shaped roller barrel is large, and the pressure difference caused in the conveying process of the conveying belt is also large, so that the conveying belt can be corrected with a large amplitude and quickly.

[0048] According to the deviation amplitude of the belt, the diameter of the middle of the waist drum-shaped roller barrel is adjusted, so that unnecessary wear of the belt caused by a large diameter is avoided, and at the same time, when the belt is not deviated, the movable support strips 12 are in the flat state, at this time, the diameters of the roller barrel are the same, so that local wear of the belt caused by different pressures in the normal conveying process is avoided.

[0049] As shown in Figure 5 and Figure 6 The expansion roller includes a sealing pipe 22 and a gas bag 23, the sealing pipe 22 is arranged inside the center roller 2, and the center roller 2 and the sealing pipe 22 are coaxially arranged, the gas bag 23 is wrapped outside the sealing pipe 22, and one end of the jack 21 located inside the center roller 2 is connected to the gas bag 23.

[0050] Further, the outer diameter of the sealing pipe 22 is smaller than the inner diameter of the center roller 2, so that an annular gap 203 is formed between the center roller 2 and the sealing pipe 22, and the gas bag 23 can be expanded or contracted in the annular gap 203.

[0051] By conveying gas into the gas bag 23, the gas bag 23 is expanded, the expanded gas bag 23 pushes the jacks 21 outwards, and further bends the movable support strips 12, at the same time, by controlling the expansion amplitude of the gas bag 23, the distance of the jacks 21 pushed outwards is adjusted, and further the bending amplitude of the movable support strips 12 is adjusted.

[0052] In specific embodiments, the support shaft 1 is provided as a circular tubular structure with one end open and one end closed, the open end of the support shaft 1 is connected with the air supply device, and a first air hole 101 is arranged at the middle position of the support shaft 1 and communicates with the inside of the sealing pipe 22, under the action of the first air hole 101, the inside of the support shaft 1 and the inside of the sealing pipe 22 are communicated with each other, and the sealing pipe 22 is provided with a second air hole 202, so that the sealing pipe 22 and the inside of the air bag 23 are communicated with each other.

[0053] In this way, the air supply device can sequentially inflate the inside of the air bag 23 through the support shaft 1 and the sealing pipe 22, so that the air bag 23 expands, and correspondingly, the air in the inside of the air bag 23 can also be sequentially discharged through the sealing pipe 22 and the support shaft 1.

[0054] Further, the open end of the support shaft 1 is provided with an air slip ring 3, and the open end of the support shaft 1 is connected with the air supply device through the air slip ring 3, and the air slip ring 3 can maintain stable connection with the air supply device and keep the air path connected when the support shaft 1 rotates.

[0055] In combination with Figure 8 As shown, the two ends of the support shaft 1 are respectively provided with distance measuring sensors 6, and the distance measuring sensors 6 are fixed on the bracket 4 through connecting rods, and the position of the belt is detected through the two distance measuring sensors 6, when the distances detected by the two distance measuring sensors 6 are consistent, it is determined that the belt is at the middle position, when the distances detected by the two distance measuring sensors 6 are consistent, it is determined that the belt is deviated, and the deviation amount is determined according to the specific value detected.

[0056] In specific embodiments, the application also includes a control unit, and the distance measuring sensors 6 and the air supply device are signal connected with the control unit.

[0057] The control unit automatically controls the inflation of the air bag 23 by the air supply device according to the detection result, and controls the inflation amount, when the deviation amount is large, the inflation amount is also large, the expansion range of the air bag 23 is large, and correspondingly, the bending range of the movable support strip 12 is also large, which can quickly and widely correct the deviation, when the deviation amount is small, the inflation amount is also small, the expansion range of the air bag 23 is small, and correspondingly, the bending range of the movable support strip 12 is also small, so as to cope with small range correction.

[0058] By arranging the distance measuring sensors 6 and the control unit, the position of the belt is detected in real time by the distance measuring sensors 6, the control unit automatically controls the inflation of the air bag 23 by the air supply device according to the detection result, and realizes automatic deviation correction, at the same time, the inflation amount of the air bag 23 by the air supply device is intelligently adjusted according to the deviation amount of the belt detected by the distance measuring sensors 6, so as to realize deviation correction of different ranges.

[0059] In combination with Figure 7As shown, the two ends of the movable support strip 12 are provided with elastic connecting pieces 5, and the movable support strip 12 is connected to the movable plate 11 through the elastic connecting pieces 5. Since the movable support strip 12 will be deformed when being bent, the elastic connecting pieces 5 are used to connect the movable plate 11, so that the deformation can be adapted, and the creases at the connection of the movable support strip 12 can be effectively avoided.

[0060] In specific embodiments, the elastic connecting pieces 5 are U-shaped elastic sheets arranged horizontally, and the elasticity of the U-shaped elastic sheets is used to adapt to the deformation of the movable support strip 12.

[0061] In combination Figure 1 and Figure 2 As shown, the two ends of the support shaft 1 are provided with baffles 15, which are fixedly arranged on the support shaft 1. The spring 16 is connected between the baffle 15 and the movable plate 11. The position of the movable plate 11 is limited by the elastic supporting force of the spring 16, so that the movable plate 11 can only be pulled and moved when the movable support strip 12 is deformed. When moving, the two movable plates 11 move synchronously and towards each other, so that the center position of the movable support strip 12 is prevented from being deviated due to the movement of the two movable plates 11 to the same side.

[0062] The working principle of the present application is as follows: when the conveying belt is not deviated, the air bag 23 is in an unexpanded state, and the jacks 21 are retracted in the insertion holes 201. At this time, the movable support strip 12 is in an unbent state, and the movable support strip 12 and the fixed support strip 14 can form a complete roller. When the conveying belt is deviated, the air bag 23 is inflated to expand, and the jacks 21 are synchronously pushed outward along the insertion holes 201. The jacks 21 bend the movable support strip 12 outward, so that the movable support strip 12 is bent to a middle convex arc shape. A plurality of bent movable support strips 12 form a drum-shaped roller with a thick middle and thin ends (as shown in the figure). Figure 2 The different diameters cause a pressure difference in the conveying process of the belt, so that the conveying belt is self-adapted to be corrected.

[0063] The belt detection device is arranged on the belt conveyor. The distance measuring sensor 6 is used to detect the positions of the two sides of the belt in real time, to determine whether the belt is deviated and the deviation amount. When the deviation amount of the conveying belt is small, the air bag 23 is expanded with a small amplitude, and the jacks 21 bend the movable support strip 12 with a small amplitude. At this time, the difference between the diameters of the middle and the two ends of the drum-shaped roller is small, and the pressure difference generated in the conveying process of the conveying belt is also small, so that the conveying belt can be corrected with a small amplitude. When the deviation amount of the conveying belt is large, the air bag 23 is expanded with a large amplitude, and the jacks 21 bend the movable support strip 12 with a large amplitude. At this time, the difference between the diameters of the middle and the two ends of the drum-shaped roller is large, and the pressure difference generated in the conveying process of the conveying belt is also large, so that the conveying belt can be quickly corrected with a large amplitude.

[0064] In summary, by setting the air bag 23 and the movable support strip 12, when the movable support strip 12 is bent by the air bag 23, a drum-shaped roller with thick middle and thin ends is formed, and by controlling the expansion range of the air bag 23, the diameter of the middle of the drum-shaped roller can be adjusted, according to the deviation range of the belt, the diameter of the middle of the drum-shaped roller is adjusted to avoid unnecessary wear of the belt caused by a larger diameter, and at the same time, when the belt does not deviate, the movable support strip 12 is in a flat state, at this time, the diameter of each part of the roller is uniform, avoiding local wear caused by different pressures during normal conveying of the belt.

[0065] By setting the fixed support strip 14, when the movable support strip 12 is in a state of not being bent (the movable support strip 12 is in a flat state), the movable support strip 12 and the fixed support strip 14 can form a complete roller (as shown in Figure 1 ), thereby reducing the wear on the conveying belt.

[0066] By setting the distance measuring sensor 6 and the control unit, the distance measuring sensor 6 is used to detect the position of the belt in real time, and the control unit automatically controls the inflation of the air bag 23 by the air supply device according to the detection result, to realize automatic deviation correction, and at the same time, according to the deviation amount of the belt detected by the distance measuring sensor 6, the inflation amount of the air bag 23 by the air supply device is intelligently adjusted to realize deviation correction of different ranges.

[0067] It should be noted that in this document, relational terms such as first and second and the like can only be used to distinguish one entity or action from another entity or action, without necessarily requiring or implying that there is any such actual relationship or order between these entities or actions. In addition, the terms "comprises", "comprising" or any other variant thereof are intended to cover non-exclusive inclusions, so that a process, method, article or apparatus that includes a list of elements does not only include those elements, but also includes other elements not explicitly listed, or other elements inherent to such a process, method, article or apparatus.

[0068] The above describes the embodiments, which is not limited, and the drawings only show one of the embodiments, and the actual structure is not limited thereto. In general, if a person skilled in the art is inspired by it, without departing from the creative purpose, without creative design, similar structure and embodiments of the technical solution can be designed, which shall belong to the protection scope.

Claims

1. A self-aligning material conveying belt roller, characterized in that, include: A support shaft (1) is provided at both ends with movable plates (11). The support shaft (1) and the movable plates (11) are arranged coaxially with each other. The movable plates (11) are configured to slide along the axial direction of the support shaft (1). Multiple circumferentially evenly distributed movable support bars (12) are connected between the two movable plates (11); The support shaft (1) is provided with a central roller (2) at the middle position. The central roller (2) is provided with a plurality of insertion holes (201) corresponding to the movable support bar (12). Each of the plurality of insertion holes (201) is slidably connected to a top rod (21) connected to the movable support bar (12). The central roller (2) is provided with an expansion roller for driving the top rod (21) to extend and retract. The movable support bar (12) is configured to be able to be pushed outward by the top rod (21); The support shaft (1) is provided with distance sensors (6) at both ends for detecting the position of the belt. The support shaft (1) is fixed with fixing plates (13) at both ends. A plurality of circumferentially evenly distributed fixed support bars (14) are connected between the two fixing plates (13), and the plurality of fixed support bars (14) are respectively located in the gap between two adjacent movable support bars (12). The expansion roller includes a sealing tube (22) and an air bladder (23). The sealing tube (22) is disposed inside the center roller (2), and the center roller (2) and the sealing tube (22) are arranged coaxially with each other. The air bladder (23) is wrapped around the outside of the sealing tube (22), and one end of the push rod (21) located inside the center roller (2) is connected to the air bladder (23). The outer diameter of the sealing tube (22) is smaller than the inner diameter of the center roller (2), so that an annular gap (203) is formed between the center roller (2) and the sealing tube (22) for the airbag (23) to expand. The support shaft (1) is configured as a cylindrical structure with one end open and the other end closed. The open end of the support shaft (1) is connected to the air supply device. A first air hole (101) communicating with the inside of the sealing tube (22) is provided at the middle position of the support shaft (1). A second air hole (202) communicating with the inside of the airbag (23) is provided on the sealing tube (22). Both ends of the movable support bar (12) are provided with elastic connectors (5), and the movable support bar (12) is connected to the movable plate (11) through the elastic connectors (5).

2. The self-aligning material conveying belt roller according to claim 1, characterized in that: The cross-sections of both the movable support bar (12) and the fixed support bar (14) are set to be circular arcs with the same radius.

3. The self-aligning material conveying belt roller according to claim 1, characterized in that: The open end of the support shaft (1) is provided with a slip ring (3), and the open end of the support shaft (1) is connected to the air supply device through the slip ring (3).

4. The self-aligning material conveying belt roller according to claim 1, characterized in that: Both ends of the support shaft (1) are provided with baffles (15), and a spring (16) is connected between the baffles (15) and the movable plate (11).

5. The self-aligning material conveying belt roller according to claim 1, characterized in that: A bracket (4) is provided below the support shaft (1), and bearings are provided at both ends of the bracket (4). The two ends of the support shaft (1) are connected to the bracket (4) through the bearings.

Images