Additional brake for escalator

Abstract

The auxiliary brake comprises a bottom plate, a main supporting plate is fixed to the bottom plate, a main shaft is rotationally connected to the main supporting plate, a driven disc is fixed to the main shaft, and a plurality of driven blocks are fixed to one side of the driven disc; the auxiliary supporting plate is fixed to the bottom plate, a transverse moving rod is connected to a transverse moving penetrating groove in the auxiliary supporting plate in an inserted mode, a brake disc is fixed to the end, close to the driven disc, of the transverse moving rod, and a brake device is arranged on the brake disc; the brake device comprises a brake roll shaft, a brake sliding rod and a brake spring, an arc-shaped groove corresponding to the brake device is formed in the brake disc, a brake sliding groove communicated with the arc-shaped groove is further formed in the brake disc, one end of the brake sliding rod is connected with the brake sliding groove in an inserted mode, the other end of the brake sliding rod abuts against the bottom face of the rolling ring groove, and the brake spring is installed in the brake sliding groove. The elastic energy storage of the brake spring is utilized, pressure is transmitted to the brake roller shaft through the brake sliding rod, when the brake roller shaft rolls in the arc-shaped groove, the brake spring generates brake force, and soft and effective brake is achieved.

Description

Technical Field

[0001] This invention belongs to the field of escalator technology, specifically relating to an auxiliary brake for escalators. Background Technology

[0002] Escalators, as a type of electromechanical special equipment, are widely used in densely populated places such as shopping malls, subways, airports, and supermarkets, providing passengers with great convenience and serving as an important means of transportation. Compared to elevators, escalators are characterized by longer start-stop intervals, longer operating times, higher passenger flow, and slower maintenance. Furthermore, the power transmission from the main unit horizontally to the guide wheel and then diagonally to the step chain is not a straight line, leading to greater safety hazards. To ensure reliable stopping in emergencies, escalators often have an additional brake on the drive sprocket of the steps in addition to the main brake, guaranteeing safe braking in emergencies such as overspeeding and reverse reversal.

[0003] Patent CN221165546U discloses an auxiliary brake and chain detection device for escalators, including a ratchet and an electromagnetic braking device. The ratchet is mounted on the drive wheel of the escalator steps. The electromagnetic braking device includes a base, a pawl, and an electromagnet. The pawl is rotatably connected to the base, and the electromagnet is connected to the pawl via a first connecting rod. The electromagnet is used to push the pawl against the ratchet through the first connecting rod. The advantages of this auxiliary brake for escalators are that it provides the function of braking the escalator, can be controlled independently, occupies little space, and is easy to install.

[0004] However, the aforementioned additional brakes lack a buffer device when braking, resulting in excessive instantaneous deceleration. Passengers experience discomfort from a sudden stop during emergency elevator closures. Summary of the Invention

[0005] The purpose of this invention is to provide an additional brake for escalators that achieves gentle yet effective braking.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an auxiliary brake for escalators, comprising: A base plate, on which a main support plate is fixed, a main shaft is rotatably connected, a driven disk is fixed on the main shaft, and a plurality of driven blocks are fixed on one side of the driven disk, the plurality of driven blocks being evenly distributed around the axis of the driven disk. A secondary support plate is fixed to the base plate. The secondary support plate is provided with a transverse sliding groove. A transverse sliding rod is inserted into the transverse sliding groove. A brake disc is fixed to one end of the transverse sliding rod near the driven disc. A braking device is provided on the brake disc. The braking device includes a brake roller shaft, a brake slide rod, and a brake spring. The brake disc has an arc-shaped groove corresponding to the braking device. The brake disc also has a brake slide groove communicating with the arc-shaped groove. The brake roller shaft has a rolling ring groove. The two opposite sides of the arc-shaped groove are inserted into the rolling ring groove. One end of the brake slide rod is inserted into the brake slide groove, and the other end abuts against the bottom surface of the rolling ring groove. The brake spring is installed in the brake slide groove and is located between the end of the brake slide rod inserted into the brake slide groove and the bottom surface of the brake slide groove. A telescopic device, which is used to move the transverse rod toward or away from the driven disc.

[0007] Furthermore, the braking device also includes a brake connecting block and a pressure sensor installed in the brake groove. The brake connecting block is disposed between the brake spring and the pressure sensor. A rotating measuring disk is rotatably connected to the secondary support plate. The rotating measuring disk is disposed between the brake disc and the secondary support plate. A measuring protrusion corresponding to the brake roller shaft is fixed on the rotating measuring disk. A rotation drive device for driving the rotating measuring disk to rotate is provided on the secondary support plate.

[0008] Furthermore, the braking device also includes a brake base block installed in the brake groove. The brake base block is located at the bottom of the brake groove. The bottom of the brake groove is provided with an adjusting threaded hole. The brake disc is provided with a connecting groove communicating with the adjusting threaded hole. An adjusting bolt that is threadedly connected to the adjusting threaded hole is installed in the connecting groove.

[0009] Furthermore, the braking device is provided in a plurality of units, which are evenly distributed around the axis of the brake disc.

[0010] Furthermore, the telescopic device includes: Telescopic support plate; Two telescopic side plates are fixed parallel to each other on the telescopic support plate; A telescopic support shaft is fixed between the two telescopic side plates; A telescopic sliding plate is provided with telescopic sliding holes and telescopic connecting holes. The telescopic support shaft passes through the telescopic sliding holes, and the telescopic sliding plate is fixedly connected to the transverse rod. A telescopic spring is sleeved on the telescopic support shaft and is disposed on the side of the telescopic sliding plate opposite to the secondary support plate. A telescopic electric push rod is fixed to the telescopic side plate away from the sub-support plate. The push rod of the telescopic electric push rod passes through the sub-support plate and the telescopic sliding hole in sequence. A telescopic fixing block is fixed to one end of the telescopic electric push rod that passes through the telescopic sliding hole.

[0011] Furthermore, the rotation drive device includes: A rotation drive motor is fixed to the secondary support plate; A rotating drive gear is fixed on the rotating drive motor, and a driven tooth is provided on the outer wall of the rotating measuring disk, and the rotating drive gear meshes with the driven tooth.

[0012] Furthermore, the brake roller shaft includes: First roller body; The second roller body has a connecting roller body fixed at one end, and one end of the connecting roller body is detachably connected to the first roller body. The first roller body and the second roller body are located on both sides of the brake disc.

[0013] Furthermore, one end of the first roller body is provided with an insertion groove, one end of the connecting roller body is inserted into the insertion groove, the connecting roller body is provided with a connecting thread hole, the side wall of the insertion groove is provided with a connecting hole, and a connecting bolt that is threadedly connected to the connecting thread hole passes through the connecting hole.

[0014] Furthermore, the end of the connecting hole is provided with a countersunk groove, and the head of the connecting bolt is located in the countersunk groove.

[0015] Furthermore, a fixing ring is fixed on the secondary support plate, and a T-shaped ring groove is provided inside the fixing ring. A T-shaped ring is installed in the T-shaped ring groove, and the T-shaped ring is rotatably connected to the T-shaped ring groove. The T-shaped ring is fixedly connected to the rotating measuring disk.

[0016] Compared with the prior art, the beneficial effects of the present invention are: (1) The elastic energy of the brake spring is used to transmit the pressure to the brake roller shaft through the brake slide bar. When the brake roller shaft rolls in the arc groove, the brake spring generates braking force to achieve gentle but effective braking. (2) The rotating drive device periodically drives the rotating measuring disk to rotate, and pushes the brake roller shaft through the measuring protrusion to simulate the braking action and detect the pressure response and component jamming, so as to achieve diagnosis without disassembly. If the brake spring fails, the pressure detected by the pressure sensor will be abnormal when the rotating measuring disk rotates to a certain angle, so that the maintenance personnel can replace the brake spring in time. The health status of the brake can be evaluated without disassembly. (3) The position of the brake block can be adjusted by rotating the adjusting bolt, thereby adjusting the elastic force of the brake spring on the brake roller shaft and thus adjusting the braking effect; (4) Multiple braking devices brake the corresponding driven blocks simultaneously, resulting in more uniform braking force and better braking effect; (5) When the push rod of the telescopic electric push rod moves toward the driven plate, the telescopic spring will drive the telescopic sliding plate to move toward the driven plate, thereby driving the brake disc to move toward the driven plate through the transverse rod, thus achieving braking; (6) When the brake spring needs to be replaced, simply disconnect the connecting roller body from the first roller body to remove the brake roller shaft. Then the brake slide bar can be removed from the brake slide groove, and the brake spring can be removed and replaced. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the additional brake for the escalator of the present invention; Figure 2 for Figure 1 Top view; Figure 3 for Figure 2 Cross-sectional view at point AA; Figure 4 for Figure 3 A magnified view of a section at point I; Figure 5 for Figure 3 Enlarged view of a section at point II; Figure 6 for Figure 2 Cross-sectional view at point BB; Figure 7 for Figure 6 A magnified view of a section at point III; Figure 8 This is a schematic diagram of the brake disc structure; Figure 9 This is a schematic diagram of the rotating measuring disk. Figure 10 This is a schematic diagram of the brake roller shaft. Figure 11 for Figure 10 A structural diagram.

[0018] In the diagram: 1. Base plate; 2. Main support plate; 3. Main shaft; 4. Driven disc; 5. Driven block; 6. Secondary support plate; 7. Lateral movement groove; 8. Lateral movement rod; 9. Brake disc; 10. Braking device; 11. Brake roller shaft; 12. Brake slide rod; 13. Brake spring; 14. Arc groove; 15. Brake slide groove; 16. Rolling ring groove; 17. Brake connecting block; 18. Pressure sensor; 19. Rotating measuring disc; 20. Measuring protrusion; 21. Brake base block; 22. Adjusting threaded hole; 23. Adjusting bolt; 24. Telescopic support plate; 25. 26. Telescopic side plate; 27. Telescopic support shaft; 28. Telescopic sliding plate; 29. ​​Telescopic sliding hole; 30. Telescopic connecting hole; 31. Telescopic spring; 32. Telescopic electric push rod; 33. Telescopic fixing block; 34. Rotation drive motor; 35. Rotation drive gear; 36. Driven gear; 37. Connecting groove; 38. First roller body; 39. Second roller body; 40. Connecting roller body; 41. Insertion groove; 42. Connecting threaded hole; 43. Connecting hole; 44. Connecting bolt; 45. Countersunk groove; 46. Fixing ring; 47. T-ring groove; 48. T-ring. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Please see Figures 1-11 This invention provides a technical solution for an additional brake for escalators.

[0021] An auxiliary brake for escalators includes: A base plate 1 is provided, a main support plate 2 is fixed on the base plate 1, a main shaft 3 is rotatably connected to the main support plate 2, a driven disk 4 is fixed on the main shaft 3, and a number of driven blocks 5 are fixed on one side of the driven disk 4. The number of driven blocks 5 are evenly distributed around the axis of the driven disk 4. A secondary support plate 6 is fixed on the base plate 1. A transverse sliding groove 7 is provided on the secondary support plate 6. A transverse sliding rod 8 is inserted into the transverse sliding groove 7. A brake disc 9 is fixed to one end of the transverse sliding rod 8 near the driven disc 4. A braking device 10 is provided on the brake disc 9. The braking device 10 includes a brake roller shaft 11, a brake slide rod 12, and a brake spring 13. The brake disc 9 is provided with an arc-shaped groove 14 corresponding to the braking device 10. The brake disc 9 is also provided with a brake slide groove 15 communicating with the arc-shaped groove 14. The brake roller shaft 11 is provided with a rolling ring groove 16. The two opposite sides of the arc-shaped groove 14 are inserted into the rolling ring groove 16. One end of the brake slide rod 12 is inserted into the brake slide groove 15, and the other end abuts against the bottom surface of the rolling ring groove 16. The brake spring 13 is installed in the brake slide groove 15 and is located between the end of the brake slide rod 12 inserted into the brake slide groove 15 and the bottom surface of the brake slide groove 15. The telescopic device is used to move the transverse rod 8 toward or away from the driven disc 4, thereby causing the brake disc 9 to move downward or away from the driven disc 4.

[0022] In the initial state (non-braking state): the telescopic device pulls the transverse rod 8 to a position away from the driven plate 4.

[0023] At this time, the brake disc 9 maintains a certain distance from the driven disc 4, and the braking device 10 does not contact the driven block 5 on the driven disc 4. The main shaft 3 and the driven disc 4 rotate freely with the elevator drive system without braking.

[0024] Braking Trigger State: When the elevator system detects the need for braking, the telescopic device is activated, pushing the horizontal transfer rod 8 towards the driven disc 4. The horizontal transfer rod 8 slides along the horizontal transfer groove 7 on the auxiliary support plate 6, causing the brake disc 9 to approach the driven disc 4. The braking device 10 on the brake disc 9 gradually approaches the driven block 5 of the driven disc 4.

[0025] Braking engagement state: The brake disc 9 continues to move until the brake roller shaft 11 contacts the driven block 5 on the driven disc 4. The rolling ring groove 16 of the brake roller shaft 11 engages with the arc-shaped groove 14 on the brake disc 9, allowing the brake roller shaft 11 to roll on the arc-shaped groove 14. When the driven disc 4 rotates, the driven block 5 drives the brake roller shaft 11 to roll. However, because the brake slide 12 is always pressed against the bottom surface of the rolling ring groove 16 by the brake spring 13, the rolling of the brake roller shaft 11 is resisted. This frictional resistance is transmitted to the driven disc 4, forming a braking force, stopping the rotation of the driven disc 4, thereby achieving the additional braking function.

[0026] The elastic energy stored in the brake spring 13 is transmitted to the brake roller shaft 11 through the brake slide rod 12. When the brake roller shaft 11 rolls in the arc groove 14, the brake spring 13 generates braking force, achieving gentle but effective braking.

[0027] Furthermore, the braking device 10 also includes a brake connecting block 17 and a pressure sensor 18 installed in the brake groove 15. The brake connecting block 17 is located between the brake spring 13 and the pressure sensor 18. A rotating measuring disk 19 is rotatably connected to the auxiliary support plate 6. A transverse rod 8 passes through the rotating measuring disk 19. The rotating measuring disk 19 is located between the brake disc 9 and the auxiliary support plate 6. A measuring protrusion 20 corresponding to the brake roller shaft 11 is fixed on the rotating measuring disk 19. A rotation drive device for driving the rotating measuring disk 19 to rotate is provided on the auxiliary support plate 6.

[0028] After braking, the telescopic device pulls back the horizontal sliding rod 8, the brake disc 9 separates, the brake spring 13 rebounds, and the rotating measuring disc 19 resets. Daily self-inspection: The rotating drive device periodically drives the rotating measuring disc 19 to rotate, pushing the brake roller shaft 11 through the measuring protrusion 20, simulating braking action and detecting pressure response and component jamming. This allows for diagnosis without disassembly. If the brake spring 13 fails, the pressure detected by the pressure sensor 18 will be abnormal when the rotating measuring disc 19 rotates a certain angle. This will trigger an alarm in the elevator system, allowing maintenance personnel to replace the brake spring 13 promptly. The health of the brake can be assessed without disassembly.

[0029] Furthermore, the braking device 10 also includes a brake base block 21 installed in the brake slide groove 15. The brake base block 21 is located at the bottom of the brake slide groove 15. The bottom of the brake slide groove 15 is provided with an adjustment threaded hole 22. The brake disc 9 is provided with a connecting groove 36 communicating with the adjustment threaded hole 22. An adjustment bolt 23 that is threadedly connected to the adjustment threaded hole 22 is installed in the connecting groove 36.

[0030] The position of the brake base block 21 can be adjusted by rotating the adjusting bolt 23, thereby adjusting the elastic force of the brake spring 13 on the brake roller shaft 11 and thus adjusting the braking effect.

[0031] Furthermore, the braking device 10 is provided in multiple units, which are evenly distributed around the axis of the brake disc 9. Multiple braking devices 10 simultaneously brake the corresponding driven blocks 5, resulting in more uniform braking force and better braking effect.

[0032] Furthermore, the telescopic device includes: Telescopic support plate 24; Two telescopic side plates 25 are fixed parallel to each other on the telescopic support plate 24. Telescopic support shaft 26, which is fixed between two telescopic side plates 25; Telescopic sliding plate 27, telescopic sliding plate 27 is provided with telescopic sliding hole 28 and telescopic connecting hole 29, telescopic support shaft 26 passes through telescopic sliding hole 28, telescopic sliding plate 27 is fixedly connected to transverse rod 8; The telescopic spring 30 is sleeved on the telescopic support shaft 26 and is located on the side of the telescopic sliding plate 27 facing away from the auxiliary support plate 6. Telescopic electric push rod 31 is fixed on telescopic side plate 25 away from the auxiliary support plate 6. The push rod of telescopic electric push rod 31 passes through the auxiliary support plate 6 and telescopic sliding hole 28 in sequence. One end of telescopic electric push rod 31 that passes through telescopic sliding hole 28 is fixed with telescopic fixing block 32.

[0033] When the push rod of the telescopic electric push rod 31 moves towards the driven disc 4, the telescopic spring 30 drives the telescopic sliding plate 27 to move towards the driven disc 4, thereby driving the brake disc 9 towards the driven disc 4 via the transverse rod 8, achieving braking. When the push rod of the telescopic electric push rod 31 moves away from the driven disc 4, the telescopic fixing block 32 drives the telescopic sliding plate 27 away from the driven disc 4, thereby driving the brake disc 9 away from the driven disc 4 via the transverse rod 8.

[0034] Furthermore, the rotation drive includes: Rotation drive motor 33 is fixed on the auxiliary support plate 6; Rotary drive gear 34 is fixed on rotary drive motor 33. Driven gear 35 is provided on the outer wall of rotary measuring disk 19. Rotary drive gear 34 meshes with driven gear 35.

[0035] The rotation drive motor 33 drives the rotation drive gear 34 to rotate, and the rotation drive gear 34 drives the rotation measuring disk 19 to rotate through the driven gear 35.

[0036] Furthermore, the brake roller shaft 11 includes: First roller body 37; The second roller body 38 has a connecting roller body 39 fixed at one end. One end of the connecting roller body 39 is detachably connected to the first roller body 37. The first roller body 37 and the second roller body 38 are located on both sides of the brake disc 9.

[0037] When the brake spring 13 needs to be replaced, simply disconnect the connecting roller body 39 from the first roller body 37, thereby removing the brake roller shaft 11. Then the brake slide bar 12 can be moved out of the brake slide groove 15, and the brake spring 13 can be removed and replaced.

[0038] The following is an embodiment in which one end of the connecting roller 39 is detachably connected to the first roller 37. One end of the first roller 37 is provided with an insertion groove 40, and one end of the connecting roller 39 is inserted into the insertion groove 40. The connecting roller 39 is provided with a connecting threaded hole 41, and the side wall of the insertion groove 40 is provided with a connecting hole 42. A connecting bolt 43, which is threaded into the connecting threaded hole 41, passes through the connecting hole 42. The end of the connecting hole 42 is provided with a countersunk groove 44, and the head of the connecting bolt 43 is located in the countersunk groove 44.

[0039] The connecting roller body 39 is fixed to the first roller body 37 by connecting bolt 43. When disassembly is required, simply unscrew the connecting bolt 43.

[0040] The following describes one rotation method between the rotating measuring disk 19 and the auxiliary support plate 6. A fixing ring 45 is fixed on the auxiliary support plate 6. A T-shaped ring groove 46 is provided in the fixing ring 45. A T-shaped ring 47 is installed in the T-shaped ring groove 46. The T-shaped ring 47 is rotatably connected to the T-shaped ring groove 46. The T-shaped ring 47 is fixedly connected to the rotating measuring disk 19, thereby realizing the rotatable connection between the rotating measuring disk 19 and the auxiliary support plate 6.

[0041] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An auxiliary brake for escalators, characterized in that, include: A base plate, on which a main support plate is fixed, a main shaft is rotatably connected, a driven disk is fixed on the main shaft, and a plurality of driven blocks are fixed on one side of the driven disk, the plurality of driven blocks being evenly distributed around the axis of the driven disk. A secondary support plate is fixed to the base plate. The secondary support plate is provided with a transverse sliding groove. A transverse sliding rod is inserted into the transverse sliding groove. A brake disc is fixed to one end of the transverse sliding rod near the driven disc. A braking device is provided on the brake disc. The braking device includes a brake roller shaft, a brake slide rod, and a brake spring. The brake disc has an arc-shaped groove corresponding to the braking device. The brake disc also has a brake slide groove communicating with the arc-shaped groove. The brake roller shaft has a rolling ring groove. The two opposite sides of the arc-shaped groove are inserted into the rolling ring groove. One end of the brake slide rod is inserted into the brake slide groove, and the other end abuts against the bottom surface of the rolling ring groove. The brake spring is installed in the brake slide groove and is located between the end of the brake slide rod inserted into the brake slide groove and the bottom surface of the brake slide groove. A telescopic device, which is used to move the transverse rod toward or away from the driven disc.

2. The auxiliary brake for an escalator according to claim 1, characterized in that, The braking device further includes a brake connecting block and a pressure sensor installed in the brake groove. The brake connecting block is disposed between the brake spring and the pressure sensor. A rotating measuring disk is rotatably connected to the sub-support plate. The rotating measuring disk is disposed between the brake disc and the sub-support plate. A measuring protrusion corresponding to the brake roller shaft is fixed on the rotating measuring disk. A rotating drive device for driving the rotating measuring disk to rotate is provided on the sub-support plate.

3. An auxiliary brake for an escalator according to claim 1, characterized in that, The braking device further includes a brake base block installed in the brake groove. The brake base block is located at the bottom of the brake groove. The bottom of the brake groove is provided with an adjusting threaded hole. The brake disc is provided with a connecting groove communicating with the adjusting threaded hole. An adjusting bolt that is threadedly connected to the adjusting threaded hole is installed in the connecting groove.

4. An auxiliary brake for an escalator according to claim 1, characterized in that, The braking device is provided in several parts, and the braking devices are evenly distributed around the axis of the brake disc.

5. An auxiliary brake for an escalator according to claim 1, characterized in that, The telescopic device includes: Telescopic support plate; Two telescopic side plates are fixed parallel to each other on the telescopic support plate; A telescopic support shaft is fixed between the two telescopic side plates; A telescopic sliding plate is provided with telescopic sliding holes and telescopic connecting holes. The telescopic support shaft passes through the telescopic sliding holes, and the telescopic sliding plate is fixedly connected to the transverse rod. A telescopic spring is sleeved on the telescopic support shaft and is disposed on the side of the telescopic sliding plate opposite to the secondary support plate. A telescopic electric push rod is fixed to the telescopic side plate away from the sub-support plate. The push rod of the telescopic electric push rod passes through the sub-support plate and the telescopic sliding hole in sequence. A telescopic fixing block is fixed to one end of the telescopic electric push rod that passes through the telescopic sliding hole.

6. An auxiliary brake for an escalator according to claim 2, characterized in that, The rotation drive device includes: A rotation drive motor is fixed to the secondary support plate; A rotating drive gear is fixed on the rotating drive motor, and a driven tooth is provided on the outer wall of the rotating measuring disk, and the rotating drive gear meshes with the driven tooth.

7. An auxiliary brake for an escalator according to claim 1, characterized in that, The brake roller shaft includes: First roller body; The second roller body has a connecting roller body fixed at one end, and one end of the connecting roller body is detachably connected to the first roller body. The first roller body and the second roller body are located on both sides of the brake disc.

8. An auxiliary brake for an escalator according to claim 7, characterized in that, One end of the first roller body is provided with an insertion groove, and one end of the connecting roller body is inserted into the insertion groove. The connecting roller body is provided with a connecting threaded hole, and the side wall of the insertion groove is provided with a connecting hole. A connecting bolt that is threadedly connected to the connecting threaded hole passes through the connecting hole.

9. An auxiliary brake for an escalator according to claim 8, characterized in that, The end of the connecting hole is provided with a countersunk groove, and the head of the connecting bolt is located in the countersunk groove.

10. An auxiliary brake for an escalator according to claim 2, characterized in that, A fixing ring is fixed on the auxiliary support plate. A T-shaped groove is provided inside the fixing ring. A T-shaped ring is installed in the T-shaped groove. The T-shaped ring is rotatably connected to the T-shaped groove and is fixedly connected to the rotating measuring disk.

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