Glue stirring and defoaming barrel

Abstract

The utility model discloses a glue stirring and defoaming barrel which comprises a tank body and a vacuum generator, the vacuum generator is communicated with the inside of the tank body through a vacuum extraction opening, and a circular shell internally communicated with a material conveying pipe is mounted at the upper end of the material conveying pipe of which the lower end is hermetically connected with the inner wall of the bottom of the tank body; a plurality of feeding through holes are formed in the side wall of the lower end of the material conveying pipe, a plurality of discharging through holes distributed at intervals in the circumferential direction are formed in the side wall of a circular shell concentric with the tank body, and at least two annular supports arranged at intervals in the vertical direction are installed on the supporting frame and located on the lower portion of the tank body. A plurality of stirring rods which extend in the radial direction and are distributed at intervals in the circumferential direction are mounted on the inner circumferential surface of each annular bracket. According to the utility model, not only can full mixing of multi-component materials in fluid be realized through circulation and stirring of the fluid in the tank body, but also circulation and stirring operations can be isolated, so that respective effects and stability of the stirred fluid during discharging are ensured.

Description

Technical Field

[0001] This utility model relates to an adhesive mixing and degassing tank, belonging to the field of adhesive treatment. Background Technology

[0002] When assembling electronic components in mobile phones, tablets, or computers, a layer of double-sided tape is applied to the back of the components to connect and mount multiple parts. In the production process of the protective film, a uniform and reliable layer of adhesive needs to be coated onto the film surface. During adhesive coating, the uniformity of the adhesive and the presence of air bubbles are crucial factors affecting the coating quality. Excessive air bubbles in the adhesive will affect the curing effect, thus impacting the performance of the adhesive layer formed on the substrate surface. Therefore, the adhesive needs to be stirred and air bubbles removed before being applied to the film. However, current adhesive stirring processes are often time-consuming and inefficient. Summary of the Invention

[0003] The purpose of this invention is to provide an adhesive mixing and degassing tank. This adhesive mixing and degassing tank can achieve full mixing of multi-component materials in the fluid by circulating and stirring the fluid in the tank, and can also isolate the circulation and stirring operations, thereby ensuring the effectiveness of each and the stability of the fluid after stirring when it is discharged.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a glue mixing and degassing tank, comprising a tank body with an inlet and an outlet, and a vacuum generator. The vacuum generator is connected to the interior of the tank body through a vacuum extraction port. A conveying pipe is vertically arranged in the central area of ​​the tank body. The upper end of the conveying pipe, which is sealed to the inner wall of the bottom of the tank body, is fitted with a circular shell that communicates with the conveying pipe. The lower end of a rotating shaft, which is concentrically arranged in the conveying pipe, is connected to the output shaft of a first motor installed on the bottom surface of the outer side of the tank body. The upper end of the rotating shaft is connected to the circular shell and is used to drive the circular shell to rotate. A plurality of inlet holes are opened on the side wall of the lower end of the conveying pipe, and a plurality of outlet holes are opened on the side wall of the circular shell, which is concentrically arranged with the tank body, and are spaced apart along the circumference.

[0005] A second motor is installed on the top surface of the outer side of the tank and directly above the rotating shaft. The lower end of a drive shaft connected to the output shaft of the second motor is rotatably connected to the top of the circular shell. The upper end of a support frame installed inside the tank is connected to the drive shaft and can rotate with it. The lower end of the support frame is rotatably fitted onto the outside of the material conveying pipe. At least two annular supports spaced apart in the vertical direction are installed on the support frame and at the lower part of the tank. Several stirring rods extending radially and spaced apart in the circumferential direction are installed on the inner circumferential surface of each annular support.

[0006] A flow guide shroud is provided between the bottom surface of the tank and the annular support. A material collection tray is located at the bottom of the flow guide shroud, which is sealed to the inner wall of the tank. Both the flow guide shroud and the material collection tray have a central clearance hole for a conveying pipe to pass through and for sealing the outer surface of the conveying pipe. The upper surface of the material collection tray, whose lower surface contacts the bottom surface of the tank, is a tapered slope that gradually slopes downwards radially inwards, lower than the inlet hole on the conveying pipe near the pipe. A movable disc, movably fitted onto the outside of the conveying pipe, is provided between the flow guide shroud and the material collection tray. The movable disc has several circumferentially spaced discharge holes. A strip-shaped protrusion is provided on the upper surface of the movable disc between any two adjacent discharge holes. The flow guide shroud has several strip-shaped holes for the strip-shaped protrusions to be inserted. A drive assembly for reciprocating movement is located below the movable disc.

[0007] The following are further improvements to the above technical solution:

[0008] 1. In the above scheme, the driving assembly includes a first electromagnet, a second electromagnet, and a return spring that cooperate with each other. A radially outward flange is provided on the outer wall of the conveying tube and below the movable disk. The first electromagnet is installed above the flange, and the second electromagnet installed on the movable disk is correspondingly arranged directly above the first electromagnet. The return spring is sleeved on the outside of the conveying tube and located between the flange and the movable disk.

[0009] 2. In the above scheme, the discharge port is opened on the side wall of the tank and located above the edge of the top surface of the guide shroud.

[0010] 3. In the above scheme, the top surface of the deflector is configured as a conical slope that is inclined downward in the radial outward direction.

[0011] 4. In the above scheme, a spiral blade is wound around the outer surface of the rotating shaft located in the inner area of ​​the material conveying pipe.

[0012] 5. In the above scheme, a pump body is installed at one end of the conveying pipe near the circular shell to transport the fluid in the lower part of the tank to the circular shell, and the fluid is glue containing particulate filler.

[0013] 6. In the above scheme, the drive shaft and the circular housing, the circular housing and the material conveying pipe, and the material conveying pipe and the lower end of the support frame are each rotatably connected by a bearing.

[0014] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art:

[0015] This utility model relates to a glue mixing and degassing tank. Several inlet holes are provided on the side wall of the lower end of the conveying pipe. Several outlet holes are provided on the side wall of a circular shell concentrically arranged with the tank body, spaced circumferentially. A second motor is mounted on the top surface of the outer side of the tank body, directly above the rotating shaft. The lower end of a drive shaft, whose upper end is connected to the output shaft of the second motor, is rotatably connected to the top of the circular shell. The upper end of a support frame located inside the tank body is connected to the drive shaft and can rotate with it. The lower end of the support frame is rotatably fitted onto the outside of the conveying pipe. At least two vertically spaced annular supports are mounted on the support frame, located at the lower part of the tank body. Several radially extending and circumferentially spaced stirring rods are mounted on the inner circumferential surface of each annular support. A flow guide is provided between the bottom surface of the tank body and the annular supports. A collection tray is provided at the bottom of the flow guide, whose outer wall is sealed to the inner wall of the tank body. A center opening is provided in both the flow guide and the collection tray for the conveying pipe to pass through and connect with the outer surface of the conveying pipe. The material collection plate, with its lower surface in contact with the bottom of the tank, has a tapered slope on its upper surface. This tapered slope, which gradually slopes downwards radially inwards, is lower than the feed inlet on the feed pipe near the feed pipe. A movable disc, movably fitted onto the outside of the feed pipe, is located between the guide shroud and the material collection plate. The movable disc has several circumferentially spaced discharge holes. A strip-shaped protrusion is located on the upper surface of the movable disc between any two adjacent discharge holes. The guide shroud has several strip-shaped holes for the strip-shaped protrusions to be inserted. A drive assembly is located below the movable disc to drive its reciprocating movement. This assembly can achieve thorough mixing of multi-component materials in the fluid by circulating and stirring the fluid in the tank. It can also work with a vacuum generator to promptly discharge gas mixed into the fluid, achieving degassing. Furthermore, the movement and opening / closing of the movable disc and the guide shroud can isolate the circulation and stirring operations, thereby ensuring their respective effects and the stability of the stirred fluid during discharge. Attached Figure Description

[0016] Appendix Figure 1 This is a schematic diagram of the structure of the glue mixing and degassing tank of this utility model;

[0017] Appendix Figure 2 This is a front sectional view of the glue mixing and degassing bucket of this utility model;

[0018] Appendix Figure 3 for Figure 2 A magnified schematic diagram of a local structure;

[0019] Appendix Figure 4 This is a partial cross-sectional view of the adhesive mixing and degassing bucket of this utility model;

[0020] Appendix Figure 5 This is a partial exploded view of the adhesive mixing and degassing bucket of this utility model.

[0021] In the attached diagrams: 100, tank body; 101, inlet; 102, outlet; 103, vacuum extraction port; 104, support foot; 200, vacuum generator; 1, conveying pipe; 2, circular shell; 3, rotating shaft; 4, first motor; 51, inlet through hole; 52, outlet through hole; 6, spiral blade; 7, connecting shaft; 8, second motor; 9, drive shaft; 10, support frame; 13, annular bracket; 14, stirring rod; 15, guide shroud; 151, strip-shaped hole; 16, collecting tray; 17, movable disc; 171, discharge through hole; 172, strip-shaped protrusion; 18, drive assembly; 181, first electromagnet; 182, second electromagnet; 183, return spring; 19, flange; 20, conical feed hopper; 21, bearing. Detailed Implementation

[0022] The present patent can be further understood through the specific embodiments given below, but they are not intended to limit the present patent.

[0023] Example 1: A glue mixing and degassing tank includes: a tank body 100 with an inlet 101 and an outlet 102 respectively, and a vacuum generator 200. The vacuum generator 200 is connected to the interior of the tank body 100 through a vacuum extraction port 103. A conveying pipe 1 is vertically arranged in the central area of ​​the tank body 100. The upper end of the conveying pipe 1 is sealed to the inner wall of the bottom of the tank body 100. A circular shell 2 with the interior connected to the conveying pipe 1 is installed at the upper end. The lower end of a rotating shaft 3 concentrically arranged in the conveying pipe 1 is connected to the output shaft of a first motor 4 installed on the outer bottom surface of the tank body 100. The upper end of the rotating shaft 3 is connected to the circular shell 2 and is used to drive the circular shell 2 to rotate. A plurality of inlet holes 51 are opened on the side wall of the lower end of the conveying pipe 1. A plurality of outlet holes 52 are opened on the side wall of the circular shell 2 concentrically arranged with the tank body 100 and spaced apart along the circumference.

[0024] A second motor 8 is installed on the top surface of the outer side of the tank 100 and directly above the rotating shaft 3. The lower end of a drive shaft 9, whose upper end is connected to the output shaft of the second motor 8, is rotatably connected to the top of the circular shell 2. The upper end of a support frame 10 disposed inside the tank 100 is connected to the drive shaft 9 and can rotate with it. The lower end of the support frame 10 is rotatably fitted onto the outside of the conveying pipe 1. At least two annular supports 13 arranged vertically at intervals are installed on the support frame 10 and located at the lower part of the tank 100. Several stirring rods 14, each extending radially and distributed circumferentially, are installed on the inner circumferential surface of each annular support 13.

[0025] A flow guide shroud 15 is provided between the bottom surface of the tank body 100 and the annular support 13. A material collection tray 16 is provided at the bottom of the flow guide shroud 15, whose outer wall is sealed to the inner wall of the tank body 100. A clearance through hole is provided in the center of both the flow guide shroud 15 and the material collection tray 16, which allows the material conveying pipe 1 to pass through and is sealed to the outer surface of the material conveying pipe 1. The upper surface of the material collection tray 16, whose lower surface contacts the bottom surface of the tank body 100, is a conical slope. The conical slope, which gradually slopes downward in the radial inward direction, is lower than the material conveying pipe 1 near the material conveying pipe 1. The feed through hole 51 is provided on the upper part of the guide shroud 15 and the material collection plate 16. A movable plate 17 is movably fitted on the outside of the material conveying pipe 1. The movable plate 17 has a number of circumferentially spaced discharge through holes 171. A strip-shaped protrusion 172 is provided on the upper surface of the movable plate 17 between any two adjacent discharge through holes 171. The guide shroud 15 has a number of strip-shaped holes 151 for inserting the strip-shaped protrusions 172. A drive assembly 18 for driving the reciprocating movement of the movable plate 17 is provided below the movable plate 17.

[0026] The aforementioned drive assembly 18 includes a first electromagnet 181, a second electromagnet 182, and a return spring 183 that cooperate with each other. A radially outward flange 19 is provided on the outer side wall of the aforementioned conveying tube 1 and below the movable disk 17. The aforementioned first electromagnet 181 is mounted above the flange 19. The aforementioned second electromagnet 182, which is mounted on the movable disk 17, is correspondingly positioned directly above the first electromagnet 181. The aforementioned return spring 183 is fitted onto the outer side of the conveying tube 1 and is located between the flange 19 and the movable disk 17.

[0027] A spiral blade 6 is wound around the outer surface of the aforementioned rotating shaft 3 located in the inner region of the conveying pipe 1; a pump body is installed at one end of the aforementioned conveying pipe 1 near the circular shell 2 for transporting fluid from the lower part of the tank 100 to the circular shell 2, wherein the fluid is glue containing particulate filler.

[0028] The aforementioned drive shaft 9 is rotatably connected to the circular housing 2, the circular housing 2 is rotatably connected to the material conveying pipe 1, and the material conveying pipe 1 is rotatably connected to the lower end of the support frame 10 via a bearing 21.

[0029] Example 2: A glue mixing and degassing tank includes: a tank body 100 with an inlet 101 and an outlet 102 respectively, and a vacuum generator 200. The vacuum generator 200 is connected to the interior of the tank body 100 through a vacuum extraction port 103. A conveying pipe 1 is vertically arranged in the central area of ​​the tank body 100. The upper end of the conveying pipe 1 is sealed to the inner wall of the bottom of the tank body 100. A circular shell 2 with the interior connected to the conveying pipe 1 is installed at the upper end. The lower end of a rotating shaft 3 concentrically arranged in the conveying pipe 1 is connected to the output shaft of a first motor 4 installed on the outer bottom surface of the tank body 100. The upper end of the rotating shaft 3 is connected to the circular shell 2 and is used to drive the circular shell 2 to rotate. A plurality of inlet holes 51 are opened on the side wall of the lower end of the conveying pipe 1. A plurality of outlet holes 52 are opened on the side wall of the circular shell 2 concentrically arranged with the tank body 100 and spaced apart along the circumference.

[0030] A second motor 8 is installed on the top surface of the outer side of the tank 100 and directly above the rotating shaft 3. The lower end of a drive shaft 9, whose upper end is connected to the output shaft of the second motor 8, is rotatably connected to the top of the circular shell 2. The upper end of a support frame 10 disposed inside the tank 100 is connected to the drive shaft 9 and can rotate with it. The lower end of the support frame 10 is rotatably fitted onto the outside of the conveying pipe 1. At least two annular supports 13 arranged vertically at intervals are installed on the support frame 10 and located at the lower part of the tank 100. Several stirring rods 14, each extending radially and distributed circumferentially, are installed on the inner circumferential surface of each annular support 13.

[0031] A flow guide shroud 15 is provided between the bottom surface of the tank body 100 and the annular support 13. A material collection tray 16 is provided at the bottom of the flow guide shroud 15, whose outer wall is sealed to the inner wall of the tank body 100. A clearance through hole is provided in the center of both the flow guide shroud 15 and the material collection tray 16, which allows the material conveying pipe 1 to pass through and is sealed to the outer surface of the material conveying pipe 1. The upper surface of the material collection tray 16, whose lower surface contacts the bottom surface of the tank body 100, is a conical slope. The conical slope, which gradually slopes downward in the radial inward direction, is lower than the material conveying pipe 1 near the material conveying pipe 1. The feed through hole 51 is provided on the upper part of the guide shroud 15 and the material collection plate 16. A movable plate 17 is movably fitted on the outside of the material conveying pipe 1. The movable plate 17 has a number of circumferentially spaced discharge through holes 171. A strip-shaped protrusion 172 is provided on the upper surface of the movable plate 17 between any two adjacent discharge through holes 171. The guide shroud 15 has a number of strip-shaped holes 151 for inserting the strip-shaped protrusions 172. A drive assembly 18 for driving the reciprocating movement of the movable plate 17 is provided below the movable plate 17.

[0032] The discharge port 102 is located on the side wall of the tank 100 and above the top edge of the guide shroud 15. The top surface of the guide shroud 15 is a tapered slope that slopes downward in a radially outward direction.

[0033] The upper end of the aforementioned rotating shaft 3 is fixedly connected to the top surface of the circular housing 2 via a connecting shaft 7 disposed inside the circular housing 2.

[0034] The aforementioned vacuum generator 200 is installed on one side edge of the outer top surface of the tank 100, the aforementioned feed port 101 is opened on the other side edge of the outer top surface of the tank 100, and the aforementioned vacuum extraction port 103 is opened on the upper side wall of the tank 100; at least three support feet 104 are installed at the bottom of the tank 100 at circumferential intervals.

[0035] Several of the above-mentioned feed through holes 51 are arranged at equal intervals along the circumference, and each of the above-mentioned feed through holes 51 is a strip-shaped through hole extending along the axial direction of the conveying pipe 1.

[0036] The inner wall of the tank 100 is cylindrical, and the outer circumferential surface of the annular support 13, which is concentric with the tank 100, is close to the inner wall of the tank 100; the stirring rods 14 on any two adjacent annular supports 13 are staggered in the circumferential direction.

[0037] Working principle:

[0038] Before applying the adhesive layer to the membrane material, the adhesive is first stirred and degassed to ensure the coating effect.

[0039] The glue is dispersed into the tank through the feed inlet 101 at the top of the tank under the guidance of the conical feed hopper. At the same time, the tank is evacuated until a vacuum is created through the vacuum evacuation port 103.

[0040] When the glue needs to be stirred, the action of the reset spring 183 in the drive assembly causes the movable disk to be at the top of its stroke. At this time, the strip protrusion 172 on the movable disk 17 is embedded in the strip hole 151 on the guide cover 15, causing the glue to gradually accumulate above the guide cover 15. Then, the second motor 8 drives the support frame 10 to rotate the stirring rod 14 on the ring bracket 13, which fully stirs and mixes the glue, improving the uniformity of the glue.

[0041] After the glue has been stirred for a period of time, the movable disk can be moved to the bottom of its stroke by the attraction of the first electromagnet 181 to the second electromagnet 182 in the drive assembly. At this time, the strip protrusion 172 on the movable disk 17 moves out from the strip hole 151 on the guide shroud 15. The glue that was originally located above the guide shroud 15 can flow to the bottom of the tank through the strip hole 151 and the discharge hole 171. It enters the conveying pipe 1 through the feed hole 51 at the lower end of the conveying pipe 1. Then, the first motor 4 drives the rotating shaft 3 to drive the spiral blade 6 to rotate. The glue that enters the conveying pipe 1 is lifted upward into the circular shell 2 by the action of the rotating spiral blade. Then, the first motor 4 drives the circular shell 2 to rotate. The glue that has been transported to the circular shell 2 is thrown outward with force through several discharge holes 52 on its side wall and hits the inner wall of the tank before flowing back downward. During the backflow process, the glue can be stirred by the rotating stirring rod 14.

[0042] By circulating and stirring the glue in an alternating or combined manner, and increasing the collision of the glue during the circulation and falling process, the glue is in full contact with the vacuum environment during continuous circulation and impact with the inner wall of the tank, and is stirred by the stirring rod. This continuously removes the small air bubbles contained in the glue and then discharges them out through the vacuum port, achieving efficient and thorough degassing of the fluid and improving the uniformity and efficiency of stirring the glue.

[0043] Once the cyclic mixing is complete, the resetting spring 183 in the drive assembly moves the movable disc to the top of its stroke, collecting the adhesive above the guide shroud 15. The evenly mixed adhesive is then discharged through the outlet 102 located above the guide shroud 15, and the coating operation continues.

[0044] When using the above-mentioned glue mixing and degassing tank, it can achieve full mixing of multi-component materials in the fluid by circulating and stirring the fluid in the tank. It can also work with a vacuum generator to promptly discharge the gas mixed in the fluid to achieve degassing. Furthermore, the circulation and stirring operations can be isolated by the movement and opening / closing of the movable disc and the guide shroud, thereby ensuring the effectiveness of each and the stability of the stirred fluid when it is discharged.

[0045] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A glue mixing and degassing tank, comprising a tank body (100) with an inlet (101) and an outlet (102) and a vacuum generator (200), wherein the vacuum generator (200) is connected to the interior of the tank body (100) through a vacuum extraction port (103), and a conveying pipe (1) is vertically arranged in the central area of ​​the tank body (100), wherein a circular shell (2) with an interior connected to the conveying pipe (1) is installed at the upper end of the conveying pipe (1), the characteristic being: The lower end of a rotating shaft (3) concentrically disposed in the conveying pipe (1) is connected to the output shaft of a first motor (4) installed on the outer bottom surface of the tank body (100). The upper end of the rotating shaft (3) is connected to the circular shell (2) and used to drive the circular shell (2) to rotate. Several feed holes (51) are opened on the side wall of the lower end of the conveying pipe (1). Several discharge holes (52) are opened on the side wall of the circular shell (2) concentrically disposed with the tank body (100) and spaced apart along the circumference. A second motor (8) is installed on the top surface of the outer side of the tank (100) and directly above the rotating shaft (3). The lower end of a drive shaft (9) whose upper end is connected to the output shaft of the second motor (8) is rotatably connected to the top of the circular shell (2). The upper end of a support frame (10) set inside the tank (100) is connected to the drive shaft (9) and can rotate accordingly. The lower end of the support frame (10) is rotatably fitted onto the outside of the conveying pipe (1). At least two annular supports (13) spaced apart in the vertical direction are installed on the support frame (10) and located at the lower part of the tank (100). Several stirring rods (14) that extend radially and are spaced apart in the circumferential direction are installed on the inner circumferential surface of each annular support (13). A flow guide shroud (15) is provided between the bottom surface of the tank (100) and the annular support (13). A collection tray (16) is provided at the bottom of the flow guide shroud (15), whose outer wall is sealed to the inner wall of the tank (100). A clearance through hole is provided in the center of both the flow guide shroud (15) and the collection tray (16) for the conveying pipe (1) to pass through and to seal with the outer surface of the conveying pipe (1). The upper surface of the collection tray (16), whose lower surface contacts the bottom surface of the tank (100), is set as a conical slope. The conical slope, which gradually slopes downward in the radial inward direction, is lower than the upper surface of the conveying pipe (1) near the upper surface of the conveying pipe (1). The feed through hole (51) is provided between the flow guide (15) and the material collection plate (16), and a movable plate (17) is movably fitted on the outside of the material conveying pipe (1). The movable plate (17) has several material dropping through holes (171) distributed circumferentially. A strip-shaped protrusion (172) is provided on the upper surface of the movable plate (17) between any two adjacent material dropping through holes (171). The flow guide (15) has several strip-shaped holes (151) for the strip-shaped protrusions (172) to be inserted. A drive assembly (18) for driving its reciprocating movement is provided below the movable plate (17).

2. The glue mixing and degassing tank according to claim 1, characterized in that: The drive assembly (18) includes a first electromagnet (181), a second electromagnet (182), and a return spring (183) that cooperate with each other. A radially outward flange (19) is provided on the outer side wall of the conveying tube (1) and below the movable disk (17). The first electromagnet (181) is installed above the flange (19). The second electromagnet (182), which is installed on the movable disk (17), is correspondingly arranged directly above the first electromagnet (181). The return spring (183) is fitted on the outside of the conveying tube (1) and is located between the flange (19) and the movable disk (17).

3. The glue mixing and degassing tank according to claim 1, characterized in that: The discharge port (102) is located on the side wall of the tank (100) and above the top edge of the guide shroud (15).

4. The glue mixing and degassing tank according to claim 3, characterized in that: The top surface of the shroud (15) is configured as a tapered slope that is inclined downward in a radially outward direction.

5. The glue mixing and degassing tank according to claim 1, characterized in that: The rotating shaft (3) is located on the outer surface of the inner region of the conveying pipe (1) and a spiral blade (6) is wound around it.

6. The glue mixing and degassing tank according to claim 1, characterized in that: The conveying pipe (1) is equipped with a pump at one end near the circular shell (2) for conveying fluid from the lower part of the tank (100) into the circular shell (2), the fluid being glue containing particulate filler.

7. The glue mixing and degassing tank according to claim 1, characterized in that: The drive shaft (9) is rotatably connected to the circular housing (2), the circular housing (2) is rotatably connected to the material conveying pipe (1), and the material conveying pipe (1) is rotatably connected to the lower end of the support frame (10) by a bearing (21).

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