CN212137601U - Automatic tracker for solar panel - Google Patents

Abstract

The utility model relates to a solar panel technical field specifically is a solar panel automatic tracking ware, aims at solving the lower technical problem of current solar panel light energy utilization ratio. The following technical scheme is adopted: the device consists of a fixed support assembly, a horizontal rotating assembly, a vertical rotating assembly and a control assembly; the fixed support component comprises a base, a fixed seat, a motor and a connecting shaft; the horizontal rotating assembly comprises a rotating seat, a driving cylindrical gear, a driven cylindrical gear, a fixed support, a driving bevel gear and two driven bevel gears; the vertical rotating assembly comprises a rotating bracket, a bracket shaft, a clutch wheel and a coil winding; the control component comprises a controller, a photoswitch, a light controller and an intermittent output relay.

Description

Automatic tracker for solar panel

Technical Field

The utility model relates to a solar panel technical field specifically is a solar panel automatic tracking ware.

Background

At present, the solar street lamp has the advantages of electricity saving and environmental protection, and is widely applied to road and square illumination. However, the existing solar street lamps all use directional solar receiving panels, can not automatically track sunlight, can not achieve the best effect of receiving light energy, and have low light energy utilization rate.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving the lower technical problem of current solar panel light energy utilization rate.

The utility model provides a technical scheme that its technical problem adopted is:

the solar panel automatic tracker consists of a fixed support component, a horizontal rotating component, a vertical rotating component and a control component; the fixed support component comprises a base, a fixed seat, a motor and a connecting shaft, wherein the fixed seat is fixed on the upper surface of the base, a first cavity is formed between the fixed seat and the base, the motor is fixed in the first cavity, an output shaft is vertically upward, the connecting shaft is fixedly connected to the upper end of the output shaft (the connecting shaft is coaxial with the output shaft, which is the mounting common knowledge of the field for the connecting shaft), and the upper part of the fixed seat is a cylindrical part taking the axis of the connecting shaft as the axis; the horizontal rotating component comprises a rotating seat, a driving cylindrical gear, a driven cylindrical gear, a fixed support, a driving bevel gear and two driven bevel gears, wherein the rotating seat is of a cylindrical structure with an opening facing downwards (the cylindrical structure is a structure formed by sealing one end of a cylindrical structure with openings at two ends), the inner side wall of the rotating seat is rotatably sleeved on the outer circular surface of the cylindrical part, a second cavity is formed between the rotating seat and the fixed seat, the connecting shaft sequentially penetrates through the fixed seat and the rotating seat in a clearance mode and then extends out of the upper part of the rotating seat (the purpose of penetrating through the clearance mode is that when the connecting shaft rotates, the fixed seat and the rotating seat cannot rotate under the driving of the connecting shaft and cannot generate resistance to the rotation of the connecting shaft), the driving bevel gear is fixedly sleeved at the upper end of the connecting shaft (namely, the driving bevel gear is positioned above the rotating seat), the driving cylindrical gear is fixedly sleeved on a shaft section of the connecting shaft, the driven cylindrical gear is eccentrically and rotatably arranged on the cylindrical part, the driven cylindrical gear is arranged in the second cavity and is meshed with the driving cylindrical gear, the inner side wall part of the rotating seat, which is positioned in the second cavity, is provided with first inner teeth meshed with the driven cylindrical gear, the fixed support is fixed on the upper surface of the rotating seat and comprises two mounting plates which are symmetrical about a plane where the axis of the connecting shaft is positioned, the two mounting plates are respectively provided with a mounting hole, the two mounting holes are arranged in an opposite way (namely the connecting line of the circle centers of the two mounting holes is a horizontal line), the two driven bevel gears are respectively meshed with the driving bevel gears, the inner hole wall of each driven bevel gear is provided with second inner teeth (the center of the existing bevel gear is provided with an inner hole for sleeving a shaft, the inner hole in the application is used for other purposes, the second inner teeth are arranged for meshing with a clutch wheel), the outer end surface of each driven bevel gear, the two driven bevel gears are respectively rotatably sleeved in the two mounting holes through mounting rings; the vertical rotating assembly comprises a rotating support, a support shaft, a clutch wheel and a coil winding, wherein the rotating support comprises a solar panel and two rotating plates fixedly connected to the lower surface of the solar panel, the two rotating plates are parallel to the mounting plates and are respectively adjacently arranged on the outer sides of the two mounting plates, a shaft hole coaxial with the mounting hole is formed in each rotating plate corresponding to the mounting hole, a transmission ring coaxial with the shaft hole is inwards protruded on the inner wall of each rotating plate, the outer diameter of the transmission ring is smaller than the inner diameter of the mounting ring, and the axial length of the transmission ring is smaller than or equal to the axial length of the mounting ring (the size design aims at that when the rotating plates are adjacently arranged on the outer sides of the mounting plates, the transmission ring can be inserted into the mounting ring), the inner hole wall of the transmission ring is provided with third inner teeth, two ends of the support shaft are respectively supported and fixed in the two shaft holes, and the clutch wheel, the outer circular surface of the clutch wheel is provided with external teeth which can be meshed with the second internal teeth and the third internal teeth, the axial length of the clutch wheel is greater than the sum of the axial lengths of the second internal teeth and the third internal teeth, and the axial length of the clutch wheel is less than the sum of the second internal teeth, the third internal teeth and the distance between the two driven bevel gears (the size design aims at that the clutch wheel can be meshed with a group of second internal teeth and third internal teeth simultaneously but cannot be meshed with two groups of teeth simultaneously) under the driving of the clutch wheel); the control assembly comprises a controller, a photoswitch, a light controller and an intermittent output relay, wherein the photoswitch and the light controller are fixed on the upper surface of the solar panel, the light controller is used for detecting the included angle between light and the solar panel, the photoswitch, the intermittent output relay and the controller are sequentially electrically connected, and the controller receives a light controller detection signal and controls the coil to be electrified and the motor to be started and stopped.

The utility model has the advantages that:

the utility model provides a solar panel automatic tracking ware can be according to the angle adaptability's of sunshine adjustment solar panel's angle to make solar panel perpendicular with the sunlight, the light energy of utilizing of maximum efficiency makes solar panel can accept more solar energy, whole device design benefit, and structural stability is strong.

Drawings

FIG. 1 is a schematic view of a front view of a tracker;

FIG. 2 is a schematic diagram of a side view of the tracker;

FIG. 3 is a front view of the rotating gantry;

FIG. 4 is a side view of the rotating gantry;

FIG. 5 is a front view of the mounting bracket;

FIG. 6 is a side view of the mounting bracket;

FIG. 7 is a schematic view of the driven bevel gear;

fig. 8 is a schematic sectional structure of the clutch pulley.

In the figure:

11-a base; 12-a fixed seat; 13-a motor; 14-a coupling shaft; 15-a first electromagnetic pin; 16-a ball bearing; 21-a rotating base; 22-driving cylindrical gear; 23-driven cylindrical gear; 24-a fixed support; 241-a mounting plate; 242-mounting holes; 25-a drive bevel gear; 26-a driven bevel gear; 261-a mounting ring; 27-a second electromagnetic pin; 31-a rotating holder; 311-a solar panel; 312-rotating plate; 313-axle hole; 314-drive ring; 315-a stiffener plate; 32-a support shaft; 33-a clutch wheel; 34-coil winding.

Detailed Description

Referring to fig. 1 to 7, the solar panel automatic tracker of the present invention is composed of a fixing support assembly, a horizontal rotation assembly, a vertical rotation assembly, and a control assembly.

The fixed support assembly comprises a base 11, a fixed seat 12, a motor 13 and a connecting shaft 14, wherein the fixed seat 12 is fixed on the upper surface of the base 11, a first cavity is formed between the fixed seat 12 and the base 11, the base 11 can be a barrel-shaped structure with an upward opening and/or the fixed seat 12 can be a barrel-shaped structure with a downward opening, the motor 13 is fixed on the base, or other structures such as a base 11-position barrel-shaped structure are adopted, as long as the first cavity can be formed between the fixed seat 12 and the base 11; the motor 13 is fixed in the first cavity, the output shaft is vertically upward, the base 11 preferably adopts a cylindrical structure, the base 11 is sleeved at the top end of the telegraph pole when in use, the motor 13 is arranged in the telegraph pole, and the motor 13 is fixedly connected with the lower surface of the fixed seat 12 by adopting an extra connecting piece, so that the space can be fully utilized, and the structure is compact; the coupling shaft 14 is fixedly connected to the upper end of the output shaft, the coupling shaft 14 is fixedly connected with the output shaft by adopting a coupler or other common parts, and the upper part of the fixed seat 12 is a cylindrical part taking the axis of the coupling shaft 14 as the axis.

The horizontal rotating assembly comprises a rotating seat 21, a driving cylindrical gear 22, a driven cylindrical gear 23, a fixed support 24, a driving bevel gear 25 and two driven bevel gears 26, wherein the rotating seat 21 is of a cylindrical structure with a downward opening, the inner side wall of the rotating seat 21 is rotatably sleeved on the outer circular surface of the cylindrical body, the rotating sleeve can be formed by embedding a bearing or a lug in a groove, and the like, and a preferable rotating sleeve structure is provided: a first semicircular groove coaxial with the outer circular surface is formed in the outer circular surface of the cylindrical part, a second semicircular groove is formed in the inner wall of the rotating base 21 corresponding to the first semicircular groove, a circular annular cavity is formed by the two semicircular grooves, and the ball 16 is embedded in the circular annular cavity, so that the rotating base 21 and the fixed base 12 can be installed in a relative rotating mode; a second cavity is formed between the rotating seat 21 and the fixed seat 12, the connecting shaft 14 penetrates through the fixed seat 12 and the rotating seat 21 in sequence at intervals and then extends out of the upper part of the rotating seat 21, a driving bevel gear 25 is fixedly sleeved at the upper end of the connecting shaft 14, a driving cylindrical gear 22 is fixedly sleeved on a shaft section of the connecting shaft 14, which is positioned in the second cavity, and the connecting shaft is fixedly sleeved by adopting conventional means such as interference fit, pin shaft fixation and the like; the driven cylindrical gear 23 is eccentrically and rotatably mounted on the cylindrical body, the eccentric and rotatable mounting is a known mounting technology for a person skilled in the art, and specifically, a shaft is fixed on the cylindrical body, and the driven cylindrical gear is rotatably mounted on the shaft, or a groove is formed in the cylindrical body, a bearing is fixed in the groove, then an inner ring of the bearing is fixed on the shaft, and the shaft is fixedly inserted into an inner hole of the driven cylindrical gear; the driven cylindrical gear 23 is arranged in the second cavity and meshed with the driving cylindrical gear 22, the inner side wall part of the rotating seat 21, which is positioned in the second cavity, is provided with first inner teeth meshed with the driven cylindrical gear 23, the fixing support 24 is fixed on the upper surface of the rotating seat 21, the fixing support 24 comprises two mounting plates 241 which are symmetrical about a plane where the axis of the connecting shaft 14 is located, the two mounting plates 241 are respectively provided with a mounting hole 242, the two mounting holes 242 are arranged oppositely, the two driven bevel gears 26 are respectively meshed with the driving bevel gear 25, the inner hole wall of each driven bevel gear 26 is provided with second inner teeth, the outer end surface of each driven bevel gear 26 is convexly provided with a mounting ring which is coaxial with the driven bevel gear 26, the two driven bevel gears 26 are respectively rotatably sleeved in the two mounting holes 242 through the mounting rings 261, and the rotating sleeve is formed by adopting a clearance sleeve or additionally arranging a.

The vertical rotating component comprises a rotating bracket 31, a bracket shaft 32, a clutch wheel 33 and a coil winding 34, wherein the rotating bracket 31 comprises a solar panel 311 and two rotating plates 312 fixedly connected to the lower surface of the solar panel 311, the two rotating plates 312 are parallel to the mounting plates 241 and are respectively adjacently arranged on the outer sides of the two mounting plates 241, a shaft hole 313 coaxial with the mounting hole 242 is arranged on each rotating plate 312 corresponding to the mounting hole 242, a transmission ring 314 coaxial with the shaft hole 313 is convexly arranged on the inner wall of each rotating plate 312, the outer diameter of the transmission ring 314 is smaller than the inner diameter of the mounting ring 261, the axial length of the transmission ring 314 is smaller than or equal to the axial length of the mounting ring 261, third internal teeth are arranged on the inner hole wall of the transmission ring 314, two ends of the bracket shaft 32 are respectively supported and fixed in the two shaft holes 313, the clutch wheel 33 is sleeved on the bracket shaft 32 in a clearance manner so as to be capable of freely rolling and sliding on the bracket shaft 32, external teeth, the axial length of the clutch wheel 33 is greater than the sum of the axial lengths of the second internal teeth and the third internal teeth, the axial length of the clutch wheel 33 is less than the sum of the second internal teeth, the third internal teeth and the distance between the two driven bevel gears 26, annular grooves coaxial with the driven bevel gears 26 are formed in the inner end surfaces of the two driven bevel gears 26, the coil winding 34 comprises an insulating cylinder and a coil wound on the outer circular surface of the insulating cylinder, two ends of the insulating cylinder are clamped in the two annular grooves respectively, the inner diameter of the insulating cylinder is greater than the inner diameter of the annular grooves, and the winding direction of the coil ensures that the clutch wheel 33 is driven to move axially by magnetic field force formed.

The control assembly includes the controller, photoswitch 41, light controller 42, intermittent output relay, photoswitch 41 and light controller 42 are fixed at solar panel 311's upper surface, light controller 42 is used for detecting light and solar panel 311's contained angle, photoswitch 41, intermittent output relay, the controller is connected electrically in proper order, light controller 42 detected signal is received to the controller and then the control coil is electrified, motor 13 opens and close, here intermittent output relay's effect is exactly intermittent type and is switched on to the controller, guarantee that intermittent type control motor 13 of controller opens and close, the coil circular telegram, and is comparatively economical and practical, because if do not establish this intermittent output relay, that motor 13 is rotatory all the time, this can waste a large amount of electric energy.

When the solar energy collecting device is used, the photoswitch 41 detects the intensity of sunlight, when the preset value is reached, the photoswitch 41 is turned on, the intermittent output relay is turned on, current is intermittently output to the controller, when the controller is electrified, the light controller 42 is also electrified, the light controller 42 detects the included angle between the sunlight and the solar panel 311 and feeds a detection signal back to the controller, the controller judges that the motor 13 is started, the output shaft and the connecting shaft 14 rotate to drive the driving cylindrical gear 22 to rotate and the driven cylindrical gear 23 to rotate, the rotating base 21 is driven to rotate through the first internal teeth, the fixed support 24 is driven to rotate, and therefore the solar panel 311 is driven to rotate horizontally; the controller is electrified, the controller judges whether the control coil is positively or negatively electrified, the coil generates magnetism to drive the clutch wheel 33 to move leftwards or rightwards to be meshed with one group of second internal teeth and third internal teeth, the connecting shaft 14 rotates to drive the first driving bevel gear 25 to rotate and drive the two driven bevel gears to rotate, the two driven bevel gears are meshed with the driving bevel gear 25 and are arranged oppositely, so that the rotating directions of the two driven bevel gears are opposite, when the clutch wheel 33 is meshed with one group of second internal teeth and third internal teeth, the meshed driven bevel gears drive the clutch wheel 33 to rotate through the second internal teeth, and the clutch wheel 33 drives the rotating plate 312 to rotate through the third internal teeth, so that the solar panel 311 is driven to rotate vertically. A delay relay can be additionally arranged between a control coil of the controller and the control motor 13, the clutch wheel 33 is driven to be in place when the motor 13 is not started, and the condition that the clutch wheel 33 is not adjusted when the motor 13 is started is avoided. When the device is applied, the main adjustment is the adjustment of horizontal rotation, the vertical rotation is only fine adjustment, and the direction of the axial movement of the clutch wheel 33 is controlled through the direction of electrification of the coil, so that which driven bevel gear is meshed is determined, and the rotation direction of the rotating bracket 31 is further controlled.

Furthermore, a first electromagnetic pin 15 is eccentrically fixed on the fixed seat 12, the first electromagnetic pin 15 is electrically connected with the controller, a pin shaft of the first electromagnetic pin 15 faces upwards, a plurality of first pin holes are uniformly distributed on a top plate of the rotating seat 21 along the circumferential direction, the pin shaft of the first electromagnetic pin 15 is inserted into one of the first pin holes in an electroless state, and the pin shaft is separated from the first pin hole in an electrified state. After the horizontal rotation adjustment is finished, the power is cut off, the pin shaft of the first electromagnetic pin 15 is inserted into one of the first pin holes to complete locking, and the rotation of the rotating seat 21 caused by external factors such as wind is avoided.

Furthermore, the horizontal rotation assembly further comprises two second electromagnetic pins 27 which are symmetrically arranged, the shells of the two second electromagnetic pins 27 are fixedly connected, the pin shafts deviate from each other in the axial direction, the two mounting plates 241 are provided with insertion holes, the pin shafts of the two second electromagnetic pins 27 are respectively inserted into the two insertion holes, the rotating plate 312 is uniformly provided with a plurality of second pin holes along the circumferential direction, the pin shaft of the second electromagnetic pin 27 is inserted into one of the second pin holes in the non-electric state, and the pin shaft of the second electromagnetic pin 27 is separated from the second pin hole in the electric state. After the vertical rotation adjustment is completed, the power is cut off, and the pin shaft of the second electromagnetic pin 27 passes through the jack and is inserted into one of the second pin holes to complete locking, so that the rotation of the rotating bracket 31 caused by external factors such as wind is avoided.

Furthermore, the two rotating plates 312 are fixedly connected through a reinforcing plate 315, the reinforcing plate 315 is located between the solar panel 311 and the second pin hole, the tops of the two mounting plates 241 are connected through an arc plate 243, and the arc plate 243 uses the axis of the support shaft 32 as an axis, so that the stability of the whole structure is enhanced.

Specifically, the two ends of the outer circular surface of the clutch wheel 33 are provided with external teeth, the middle part is a cylindrical surface, and the axial lengths of the external teeth at the two ends are all equal to the sum of the axial lengths of the second internal teeth and the third internal teeth, so that accurate meshing transmission can be ensured, and the processing cost is reduced.

While the invention has been particularly shown and described with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (5)

1. Solar panel automatic tracking ware, its characterized in that:

the device consists of a fixed support assembly, a horizontal rotating assembly, a vertical rotating assembly and a control assembly;

the fixed support assembly comprises a base (11), a fixed seat (12), a motor (13) and a connecting shaft (14), wherein the fixed seat (12) is fixed on the upper surface of the base (11), a first cavity is formed between the fixed seat and the base, the motor (13) is fixed in the first cavity, an output shaft is vertically upward, the connecting shaft (14) is fixedly connected to the upper end of the output shaft, and the upper part of the fixed seat (12) is a cylindrical part taking the axis of the connecting shaft (14) as the axis;

the horizontal rotating assembly comprises a rotating seat (21), a driving cylindrical gear (22), a driven cylindrical gear (23), a fixed support (24), a driving bevel gear (25) and two driven bevel gears (26), wherein the rotating seat (21) is of a cylindrical structure with a downward opening, the inner side wall of the rotating seat (21) is rotatably sleeved on the outer circular surface of the cylindrical part, a second cavity is formed between the rotating seat (21) and the fixed seat (12), a connecting shaft (14) sequentially penetrates through the fixed seat (12) and the rotating seat (21) in a clearance mode and extends out of the upper portion of the rotating seat (21), the driving bevel gear (25) is fixedly sleeved at the upper end of the connecting shaft (14), the driving cylindrical gear (22) is fixedly sleeved on a shaft section of the connecting shaft (14) which is located in the second cavity, the driven cylindrical gear (23) is eccentrically and rotatably installed on the cylindrical part, the driven cylindrical gear (23) is arranged in the second cavity and is meshed with the driving cylindrical gear (, the inner side wall part of the rotating seat (21) located in the second cavity is provided with first inner teeth meshed with the driven cylindrical gear (23), the fixing support (24) is fixed on the upper surface of the rotating seat (21), the fixing support (24) comprises two mounting plates (241) which are symmetrical about a plane where the axis of the connecting shaft (14) is located, mounting holes (242) are formed in the two mounting plates (241), the two mounting holes (242) are arranged oppositely, the two driven bevel gears (26) are meshed with the driving bevel gear (25), the inner hole wall of each driven bevel gear (26) is provided with second inner teeth, the outer end face of each driven bevel gear (26) is convexly provided with a mounting ring (261) coaxial with the driven bevel gear (26), and the two driven bevel gears (26) are rotatably sleeved in the two mounting holes (242) through the mounting rings (261);

the vertical rotating assembly comprises a rotating support (31), a support shaft (32), a clutch wheel (33) and a coil winding (34), the rotating support (31) comprises a solar panel (311) and two rotating plates (312) fixedly connected to the lower surface of the solar panel (311), the two rotating plates (312) are parallel to the mounting plates (241) and are respectively arranged on the outer sides of the two mounting plates (241) in an adjacent mode, a shaft hole (313) coaxial with the mounting hole (242) is formed in each rotating plate (312) corresponding to the mounting hole (242), a transmission ring (314) coaxial with the shaft hole (313) is inwards protruded on the inner wall of each rotating plate (312), the outer diameter of the transmission ring (314) is smaller than the inner diameter of the mounting ring (261), the axial length of the transmission ring (314) is smaller than or equal to that of the mounting ring (261), third inner teeth are arranged on the inner hole wall of the transmission ring (314), two ends of the support shaft (32) are respectively supported and fixed in the two shaft holes, the clutch wheel (33) is sleeved on the support shaft (32) in a clearance mode so as to freely roll and slide on the support shaft (32), outer teeth capable of being meshed with the second inner teeth and the third inner teeth are arranged on the outer circular surface of the clutch wheel (33), the axial length of the clutch wheel (33) is larger than the sum of the axial lengths of the second inner teeth and the third inner teeth, the axial length of the clutch wheel (33) is smaller than the sum of the second inner teeth, the third inner teeth and the distance between the two driven bevel gears (26), annular grooves coaxial with the driven bevel gears (26) are formed in the inner end surfaces of the two driven bevel gears (26), the coil winding (34) comprises an insulating cylinder and a coil wound on the outer circular surface of the insulating cylinder, two ends of the insulating cylinder are clamped in the two annular grooves respectively, the inner diameter of the insulating cylinder is larger than the inner diameter of the annular grooves, and the winding direction of the coil ensures that the clutch wheel (;

the control assembly comprises a controller, a light control switch (41), a light controller (42) and an intermittent output relay, wherein the light control switch (41) and the light controller (42) are fixed on the upper surface of a solar panel (311), the light controller (42) is used for detecting the included angle between light and the solar panel (311), the light control switch (41), the intermittent output relay and the controller are sequentially electrically connected, the controller receives a detection signal of the light controller (42) and then controls the coil to be electrified, and a motor (13) is started and stopped.

2. The solar panel automatic tracker according to claim 1, characterized in that: the fixed seat (12) is further eccentrically and fixedly provided with a first electromagnetic pin (15), the first electromagnetic pin (15) is electrically connected with the controller, a pin shaft of the first electromagnetic pin (15) faces upwards, a plurality of first pin holes are uniformly distributed in the top plate of the rotating seat (21) along the circumferential direction, the pin shaft of the first electromagnetic pin (15) is inserted into one of the first pin holes in an electroless state, and the pin shaft is separated from the first pin holes in an electrified state.

3. The solar panel automatic tracker according to claim 2, characterized in that: the horizontal rotation assembly further comprises two second electromagnetic pins (27) which are symmetrically arranged, the shells of the two second electromagnetic pins (27) are fixedly connected, the pin shafts face away from each other, jacks are formed in the two mounting plates (241), the pin shafts of the two second electromagnetic pins (27) are respectively inserted into the two jacks, a plurality of second pin holes are uniformly distributed in the circumferential direction on the rotating plate (312), the pin shafts of the second electromagnetic pins (27) are inserted into one of the second pin holes in the non-electric state, and the pin shafts are separated from the second pin holes in the electric state.

4. The solar panel automatic tracker according to any one of claims 1 to 3, wherein: the two rotating plates (312) are fixedly connected through a reinforcing plate (315), the reinforcing plate (315) is located between the solar panel (311) and the second pin hole, the tops of the two mounting plates (241) are connected through an arc plate (243), and the arc plate (243) takes the axis of the support shaft (32) as an axis.

5. The solar panel automatic tracker according to claim 4, characterized in that: the excircle surface of the cylindrical part is provided with a first semicircular groove coaxial with the excircle surface, the inner wall of the rotating seat (21) is provided with a second semicircular groove corresponding to the first semicircular groove, the two semicircular grooves form a circular annular cavity, and the circular annular cavity is internally embedded with a ball (16).

Images