A gear brake mechanism for a CNC horizontal turntable

Abstract

The present invention provides a gear brake mechanism for a numerically controlled horizontal turntable, and belongs to the field of mechanical technology. It solves the technical problems of the existing gear brake mechanism, such as the complex structure. The numerically controlled horizontal turntable includes a box body and a turntable, an annular support platform is provided in the box body, a support ring is fixed on the lower side of the turntable, a fixed ring is fixed on the annular support platform, the gear brake mechanism includes a fixed brake gear ring and a brake frame, the brake frame includes a piston and a dynamic brake gear ring, a pressure chamber that can push the piston to move downward is provided between the piston and the annular support platform, the fixed brake gear ring is arranged on the support ring, a lower fixed tooth 1 is provided on the upper side of the fixed brake gear ring, a lower fixed tooth 2 is provided on the upper side of the fixed ring, and an upper fixed tooth is provided on the lower side of the dynamic brake gear ring along the circumferential direction, and the upper fixed tooth can mesh with the lower fixed tooth 1 and the lower fixed tooth 2 at the same time when the piston moves downward, and a spring is also provided between the fixed ring and the brake frame. The present invention has the advantage of simple structure.

Description

Technical Field

[0001] The invention belongs to the field of mechanical technology and relates to a numerically controlled horizontal turntable, in particular to a gear-type brake mechanism of the numerically controlled horizontal turntable. Background Art

[0002] CNC horizontal turntable is mainly used in milling machines, drilling machines and machining centers to fix and rotate workpieces, and cooperate with the four-axis operation of the machine tool to achieve four-axis machining.

[0003] In the current horizontal turntable, the connection between the turntable and the box body is mainly achieved through supporting bearings. For example, a three-piece gear positioning and locking mechanism used in a horizontal CNC dividing plate disclosed in a Chinese patent document [Application No. 201921587739.1] includes a main body, a rotating spindle is arranged on the inner side of the main body, piston teeth are arranged between the rotating spindle and the main body, rotating teeth are arranged on the top of the piston teeth relative to the bottom of the mother disk, and the piston teeth and the rotating teeth are meshed with each other, and a fixed tooth is arranged on the side of the inner surface edge of the main body relative to the rotating teeth, and the rotating teeth and the fixed teeth are meshed with each other, a full oil chamber is formed between the piston pressure cover and the piston teeth, and a middle wall oil chamber is also formed between the rotating spindle and the piston teeth, the rotating teeth, piston teeth and fixed teeth are all annular gear structures, and the rotating teeth and the piston teeth are all rotationally connected. This patent uses a method in which piston teeth simultaneously engage rotating teeth and fixed teeth to achieve gear braking. However, in this patent, both the rotating teeth and the piston teeth are rotating. In order to achieve precise positioning of the turntable, extremely high requirements are placed on the meshing accuracy between teeth. The more moving parts there are, the greater the impact on the accuracy. The rotating teeth and piston teeth in rotational connection will affect the accuracy of the turntable after braking. Frequent calibration is required during use to ensure accuracy, and the cost of use is high. At the same time, two oil chambers need to be set in this patent to achieve engagement and separation respectively, which requires two sets of oil circuits and corresponding sealing structures, resulting in a complex structure and high cost. Summary of the invention

[0004] The purpose of the present invention is to solve the above problems in the prior art and to propose a gear brake mechanism for a CNC horizontal turntable. The technical problem solved by the present invention is to provide a gear brake mechanism with a simpler structure.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] A gear brake mechanism for a CNC horizontal turntable, the CNC horizontal turntable comprises a box body and a turntable rotatably connected to the box body, an annular support platform is arranged in the box body, a support ring abutting against the annular support platform is fixed on the lower side of the turntable, a fixed ring is fixed on the inner side of the support ring on the annular support platform, and the gear brake mechanism comprises a fixed brake gear ring and a brake frame, the brake frame comprises a piston and a dynamic brake gear ring, the piston is located on the inner side of the fixed ring, and a pressure chamber that can push the piston to move downward is arranged between the piston and the annular support platform. The fixed brake gear ring is arranged on the supporting ring, and a lower fixed tooth 1 is circumferentially provided on the upper side of the fixed brake gear ring, and a lower fixed tooth 2 is provided on the upper side of the fixed ring. The dynamic brake gear ring is fixed on the piston and is located directly above the fixed brake gear ring and the fixed ring, and an upper fixed tooth is circumferentially provided on the lower side of the dynamic brake gear ring. When the piston moves downward, the upper fixed tooth can simultaneously engage with the lower fixed tooth 1 and the lower fixed tooth 2. A spring is also provided between the fixed ring and the brake frame, which can cause the piston to move upward and reset after the pressure in the pressure chamber is reduced.

[0007] The fixed ring is fixed on the housing, and when the fixed teeth of the dynamic brake gear ring are meshed with the lower fixed teeth 2, the dynamic brake gear ring is fixed to the housing in the circumferential direction. At this time, the fixed teeth of the dynamic brake gear ring are also meshed with the lower fixed teeth 1 of the fixed brake gear ring, thereby realizing the circumferential fixation of the fixed brake gear ring and the housing, thereby realizing the fixation of the turntable, and the turntable is fixed by the meshing between teeth. After full meshing, it is firmly fixed to ensure that the turntable will not shift, which can meet the high-precision requirements during machine tool processing; at the same time, it is only necessary for the teeth to mesh, that is, the pressure in the pressure chamber only needs to compress the spring to move the piston downward, and the pressure requirement is relatively small, which reduces the requirements for sealing and oil pumps, and reduces costs; the resetting of the dynamic brake gear ring is achieved by a spring, and is only achieved by oil pressure when meshing, which reduces the requirements for sealing, thereby making the structure simpler and the production and maintenance costs lower.

[0008] In the gear brake mechanism of the above-mentioned CNC horizontal turntable, a sealing convex ring 1 is provided on the inner side of the fixed ring, the sealing convex ring 1 is in contact with the inner wall of the annular support platform, and a sealing ring 1 is provided between the sealing convex ring 1 and the inner wall of the annular support platform; a piston head is provided at the lower end of the piston, the piston head is located directly below the sealing convex ring 1, the piston head and the inner wall of the annular support platform are sealed by a sealing ring 2, the piston and the inner wall of the fixed ring are sealed by a sealing ring 3, and the above-mentioned pressure chamber is formed between the piston head, the sealing convex ring 1 and the annular support platform. An oil inlet hole and a pressure relief hole connected to the pressure chamber are provided on the box body, the oil inlet hole is connected to the oil pump, and the piston is moved downward by increasing the pressure in the pressure chamber.

[0009] In the gear brake mechanism of the above-mentioned CNC horizontal turntable, the fixed ring and the annular support platform are provided with lifting rods, the lifting rods can move relative to the fixed ring and the annular support platform, and the upper end of the lifting rods is fixedly connected to the dynamic brake gear ring. The connection between the lifting rod and the dynamic brake gear ring can realize the upward fixation of the dynamic brake gear ring in the circumferential direction, thereby ensuring that the lower fixed tooth 1 and the upper fixed tooth can mesh after the turntable rotates to a set angle, and the dynamic brake gear ring and the fixed ring are relatively fixed in the circumferential direction, so the lower fixed tooth 2 and the upper fixed tooth always remain relatively still in the circumferential direction. When in use, it is only necessary to control the rotation angle of the turntable so that the lower fixed tooth 2 and the lower fixed tooth 1 are aligned. There are few moving parts, and the position during meshing can be accurately controlled, thereby improving the braking accuracy and realizing high-precision positioning of the turntable. At the same time, the structure is simpler, and braking can be achieved more quickly during operation.

[0010] In the gear brake mechanism of the above-mentioned CNC horizontal turntable, a rotating rod is also rotatably connected in the box body, one end of the rotating rod is connected to the lifting rod through a connecting rod, and a sensing piece is fixed to the other end of the rotating rod, and protruding sensing heads are symmetrically arranged on the sensing piece, and proximity switches are respectively arranged on the box body in front of the two sensing heads. When the lifting rod moves up and down, the connecting rod can rotate back and forth with the rotating rod, and the sensing piece rotates back and forth with the rotating rod. The two sensing heads will approach the proximity switches corresponding to the principle respectively, and can sense that the lifting rod is in the rising position or the falling position at this time, thereby realizing the judgment of whether the turntable is in a fixed state.

[0011] In the gear brake mechanism of the CNC horizontal turntable, the fixed ring is provided with a plurality of lower blind holes, the dynamic brake gear ring is provided with upper blind holes corresponding to the lower blind holes, and the two ends of the spring are respectively located in the lower blind holes and the upper blind holes. The lower blind holes and the upper blind holes are distributed along the circumferential direction, and the positioning of the spring is achieved through this structure, and the spring is guided to expand and contract up and down.

[0012] In the gear brake mechanism of the CNC horizontal turntable, both sides of the ends of the upper fixed teeth are provided with upper abutment slopes, which are arranged along the radial direction of the dynamic brake gear ring, and both sides of the ends of the lower fixed teeth 1 and 2 are provided with lower abutment slopes, which are arranged along the radial direction of the dynamic brake gear ring. When the upper fixed teeth are engaged with the lower fixed teeth 1 and 2, the upper abutment slopes of the upper fixed teeth are in contact with the lower abutment slopes of the lower fixed teeth 1 and 2. This structure ensures that the meshing is in place.

[0013] In the gear brake mechanism of the numerically controlled horizontal turntable, the fixed brake gear ring is located inside the support ring, and the fixed brake gear ring and the support ring are integrally formed, so as to achieve the purpose of compact structure.

[0014] Compared with the prior art, the gear brake mechanism of the CNC horizontal turntable has the advantages of simpler structure and higher precision. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional structural schematic diagram of this CNC horizontal turntable.

[0016] Figure 2 It is a schematic diagram of the cross-sectional structure of this CNC horizontal turntable.

[0017] Figure 3 yes Figure 2 Schematic diagram of the enlarged structure of part A in the middle.

[0018] Figure 4 yes Figure 2 Schematic diagram of the enlarged structure of part B in the middle.

[0019] Figure 5 This is a schematic diagram of the internal structure of the CNC horizontal turntable after the box body is removed.

[0020] Figure 6 It is a three-dimensional structural diagram of the box.

[0021] Figure 7 yes Figure 6 Schematic diagram of the enlarged structure of part C in the middle.

[0022] Figure 8 It is a schematic diagram of the positional relationship between the fixed brake gear ring and the fixed ring.

[0023] Fig. 9 yes Figure 8 Schematic diagram of the enlarged structure of part D in the middle.

[0024] Fig.10 It is a three-dimensional structural diagram of the brake frame.

[0025] Fig.11 yes Fig.10 Schematic diagram of the enlarged structure of part E in the middle.

[0026] In the figure, 1, box body; 11, sealing step; 111, sealing ring five; 12, annular support platform; 13, oil storage groove; 14, lubricating oil groove; 141, broken line segment; 142, extension segment; 15, fixed sleeve; 16, positioning snap ring; 17, oil storage tank; 2, turntable; 21, sealing convex ring two; 22, support ring; 23, fixed brake gear ring; 24, lower fixed gear one; 3, mandrel; 31, tapered roller bearing; 32, locking nut; 33, sealing ring four; 34, turbine; 35, skeleton oil seal; 4, fixing ring; 41, sealing convex ring one; 42, sealing ring one; 43, lower fixed gear two; 44, lower abutment inclined surface; 45, lower blind hole; 5, brake frame; 51. Piston; 511. Sealing ring three; 52. Piston head; 521. Sealing ring two; 53. Pressure chamber; 54. Dynamic brake gear ring; 55. Upper fixed tooth; 56. Upper abutment slope; 57. Upper blind hole; 6. Spring; 7. Lifting rod; 71. Rotating rod; 72. Connecting rod; 73. Induction piece; 74. Induction head. DETAILED DESCRIPTION

[0027] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0028] like Figures 1 to 11 As shown, the numerical control horizontal turntable 2 comprises a box body 1, a turntable 2 rotatably connected to the box body 1, and a core shaft 3 fixedly connected to the turntable 2. A sealing step 11 is provided on the outer side of the upper end surface of the box body 1, and a sealing convex ring 21 opposite to the abutting step is provided on the turntable 2, and a sealing ring 5 111 is provided between the sealing step 11 and the sealing convex ring 21. An annular support platform 12 is provided in the middle of the box body 1, and a supporting ring 22 abutting against the annular support platform 12 is fixed on the lower side of the turntable 2, and an annular oil storage groove 13 is provided between the outer side of the annular support platform 12 and the box body 1, and a fixing ring 4 is fixed on the inner side of the fixing ring 4 on the inner side of the fixing ring 4, and a sealing convex ring 1 41 is provided on the inner side of the fixing ring 4, and the sealing convex ring 1 41 abuts against the inner wall of the annular support platform 12, and a sealing ring 1 42 is provided between the sealing convex ring 1 41 and the inner wall of the annular support platform 12.

[0029] The gear brake mechanism includes a fixed brake gear ring 23 and a brake frame 5, the brake frame 5 includes a piston 51 and a dynamic brake gear ring 54, the piston 51 is located on the inner side of the fixed ring 4 and can move up and down relative to the fixed ring 4, a pressure chamber 53 that can push the piston 51 to move downward is provided between the piston 51 and the annular support platform 12, a piston head 52 is provided at the lower end of the piston 51, the piston head 52 is located directly below the sealing convex ring 1 41, the piston head 52 and the inner wall of the annular support platform 12 are sealed by a sealing ring 2 521, the piston 51 and the inner wall of the fixed ring 4 are sealed by a sealing ring 3 511, and the above-mentioned pressure chamber 53 is formed between the piston head 52, the sealing convex ring 1 41 and the annular support platform 12. The box body 1 is provided with an oil inlet hole and a pressure relief hole connected to the pressure chamber 53, the oil inlet hole is connected to the oil pump, and the piston 51 is moved downward by increasing the pressure in the pressure chamber 53.

[0030] The fixed brake gear ring 23 is located on the inner side of the support ring 22, and the fixed brake gear ring 23 is integrally formed with the support ring 22. A lower fixed tooth 24 is circumferentially provided on the upper side of the fixed brake gear ring 23, and a lower fixed tooth 2 43 is provided on the upper side of the fixed ring 4. The dynamic brake gear ring 54 is fixed on the piston 51 and is located directly above the fixed brake gear ring 23 and the fixed ring 4. An upper fixed tooth 55 is circumferentially provided on the lower side of the dynamic brake gear ring 54. When the piston 51 moves downward, the upper fixed tooth 55 can engage with the lower fixed tooth 24 and the lower fixed tooth 2 43 at the same time. A lower fixed tooth 24 is circumferentially provided on the upper side of the fixed brake gear ring 23, and a lower fixed tooth 2 43 is provided on the upper side of the fixed ring 4. The dynamic brake gear ring 54 Fixed on the piston 51 and located just above the fixed brake gear ring 23 and the fixed ring 4, an upper fixed tooth 55 is provided on the lower side of the dynamic brake gear ring 54 along the circumferential direction. When the piston 51 moves downward, the upper fixed tooth 55 can mesh with the lower fixed tooth 1 24 and the lower fixed tooth 2 43 at the same time. Upper abutment slopes 56 are provided on both sides of the end of the tooth of the upper fixed tooth 55, and the abutment slopes are arranged along the radial direction of the dynamic brake gear ring 54. Lower abutment slopes 44 are provided on both sides of the end of the tooth of the lower fixed tooth 1 24 and the lower fixed tooth 2 43, and the lower abutment slopes 44 are arranged along the radial direction of the dynamic brake gear ring 54. When the upper fixed tooth 55 is meshed with the lower fixed tooth 1 24 and the lower fixed tooth 2 43, the upper fixed tooth 55 The upper abutment bevel 56 fits with the lower abutment bevel 44 of the lower fixed tooth 1 24 and the lower abutment bevel 44 of the lower fixed tooth 2 43; in this embodiment, the upper fixed tooth 55 is divided into 360 degrees, the lower fixed tooth 1 24 is also divided into 360 degrees, the lower fixed tooth 2 43 is divided into several sections, and holes are opened between the several sections to meet the installation requirements. The central angle between two adjacent teeth of the lower fixed tooth 2 43 is 1° to match the upper fixed tooth 55. The lower fixed tooth 1 24 and the lower fixed tooth 2 43 are both opened radially, so the width of the tooth groove gradually decreases toward the center of the circle, so the width of the upper fixed tooth 55 gradually decreases toward the center of the circle to match the lower fixed tooth 1 24 and the lower fixed tooth 2 43, so that the lower abutment bevel 44 and the upper abutment bevel 56 can fit completely.

[0031] A spring 6 is also provided between the box body 1 and the brake frame 5, which can move the piston 51 upward and reset after the pressure in the pressure chamber 53 is reduced. Specifically, a plurality of lower blind holes 45 are provided on the fixed ring 4, and upper blind holes 57 corresponding to the lower blind holes 45 are provided on the dynamic brake gear ring 54. The two ends of the spring 6 are respectively located in the lower blind holes 45 and the upper blind holes 57.

[0032] The fixed ring 4 and the annular support platform 12 are provided with a lifting rod 7, which can move relative to the fixed ring 4 and the annular support platform 12, and the upper end of the lifting rod 7 is fixedly connected to the dynamic brake gear ring 54. A rotating rod 71 is also rotatably connected in the box body 1, and one end of the rotating rod 71 is connected to the lifting rod 7 through a connecting rod 72, and a sensing member 73 is fixed to the other end of the rotating rod 71, and a protruding sensing head 74 is symmetrically provided on the sensing member 73, and a proximity switch is respectively provided in front of the two sensing heads 74 on the box body 1. The connection between the lifting rod 7 and the dynamic brake gear ring 54 can realize the upward fixation of the dynamic brake gear ring 54 in the circumferential direction. When the lifting rod 7 moves up and down, the connecting rod 72 can rotate back and forth with the rotating rod 71, and the sensing member 73 rotates back and forth with the rotating rod 71. The two sensing heads 74 will respectively approach the proximity switches corresponding to the principle, and can sense that the lifting rod 7 is in the ascending position or the descending position at this time, thereby realizing the judgment of whether the turntable 2 is in a fixed state.

[0033] The fixed ring 4 is fixed on the housing 1. When the upper fixed teeth 55 of the dynamic brake gear ring 54 are meshed with the lower fixed teeth 243, the dynamic brake gear ring 54 is fixed to the housing 1 in the circumferential direction. At this time, the fixed teeth of the dynamic brake gear ring 54 are also meshed with the lower fixed teeth 24 of the fixed brake gear ring 23, thereby realizing the circumferential fixation of the fixed brake gear ring 23 and the housing 1, thereby realizing the fixation of the turntable 2. The turntable 2 is fixed by the meshing between teeth. After full meshing, it is firmly fixed to ensure that the turntable 2 will not shift, which can meet the high-precision requirements during machine tool processing; at the same time, the teeth only need to mesh, that is, the pressure in the pressure chamber 53 only needs to be able to compress the spring 6 to move the piston 51 downward, and the pressure size required is relatively small, which reduces the requirements for sealing and oil pumps and reduces costs.

[0034] Furthermore, a lubricating oil groove 14 distributed in a ring shape is opened on the upper side surface of the annular support platform 12, and the lubricating oil groove 14 includes a plurality of V-shaped fold line segments 141 and extension segments 142 corresponding to the fold line segments 141 one by one. The plurality of fold line segments 141 are connected end to end in sequence to form a ring, and a support ring 22 is fixed to the lower side of the turntable 2, and the support ring 22 fits against the annular support platform 12 and covers the lubricating oil groove 14, the two ends of the fold line segment 141 are close to the inner side of the support ring 22, the bent portion of the fold line segment 141 is close to the outer side of the support ring 22, the outer end of the extension segment 142 is connected to the bent portion of the corresponding fold line segment 141, and the inner end of the extension segment 142 and the two ends of the fold line segment 141 are located on the same arc, so that when the support ring 22 rotates, each part of the support ring 22 is lubricated with sufficient lubricating oil in the radial direction.

[0035] A fixing sleeve 15 is provided at the lower part of the housing 1. The lower end of the mandrel 3 is located in the fixing sleeve 15 and is rotatably connected to the fixing sleeve 15 via a tapered roller bearing 31. A locking nut 32 is also fixed to the lower end of the mandrel 3. The lower end of the inner ring of the tapered roller bearing 31 abuts against the locking nut 32. A positioning snap ring 16 is fixed to the upper end of the fixing sleeve 15. The inner side of the fixing snap ring protrudes relative to the inner wall of the fixing sleeve 15. The upper end of the outer ring of the tapered roller bearing 31 abuts against the fixing snap ring. An oil storage tank 17 is formed between the outer side of the fixing sleeve 15 and the housing 1. A turbine 34 is fixedly connected to the mandrel 3. The turbine 34 is located in the oil storage tank 17. The upper side of the turbine 34 is higher than the upper end surface of the fixing sleeve 15. The locking nut 32 and the inner wall of the fixing sleeve 15 are sealed by a skeleton oil seal 35. A sealing ring 4 33 is provided between the locking nut 32 and the mandrel 3. A worm gear meshing with the turbine 34 is also provided in the housing 1. The core shaft 3 is driven to rotate by the worm gear mechanism of the turbine 34 to realize the rotation of the turntable 2. The lubricating oil in the oil storage tank 17 is used to lubricate the worm gear transmission of the turbine 34. When in use, the lubricating oil level in the oil storage tank 17 needs to submerge the turbine 34, that is, the lubricating oil will overflow into the interior of the fixed sleeve 15 through the fixed sleeve 15 and the positioning snap ring 16, and can lubricate the tapered roller bearing 31 at the same time, and the lubricating oil in the fixed sleeve 15 is sealed by the skeleton oil seal 35.

[0036] During operation, the core shaft 3 drives the turntable 2 to rotate, and the box body 1 and the turntable 2 are in contact with the support ring 22 through the annular support platform 12. When rotating, the support ring 22 and the annular support platform 12 are in sliding friction, and the lubricating oil is stored in the oil storage groove 13. The lubricating oil enters between the support ring 22 and the annular support platform 12 through the lubricating oil groove 14, thereby reducing the friction when the turntable 2 rotates. Several segments of broken line segments 141 can make the lubricating oil more evenly distributed in the radial direction, ensuring that each contact part between the support ring 22 and the annular support platform 12 has sufficient lubricating oil lubrication. The above structure can ensure that the turntable 2 rotates smoothly relative to the annular support platform 12 at a low speed; further, after a long period of operation, there will be tiny debris in the support ring 22 and the annular support platform 12, and the debris can be collected by the sedimentation lubricating oil groove 14, thereby avoiding the wear of the support ring 22 and the annular support platform 12 by the debris.

[0037] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A gear brake mechanism for a numerically controlled horizontal turntable, the numerically controlled horizontal turntable comprising a housing (1) and a turntable (2) rotatably connected to the housing (1), an annular support platform (12) being arranged in the housing (1), a support ring (22) being fixed on the lower side of the turntable (2) and abutting against the annular support platform (12), a fixing ring (4) being fixed on the inner side of the support ring (22) on the annular support platform (12), characterized in that: The gear brake mechanism comprises a fixed brake gear ring (23) and a brake frame (5), wherein the brake frame (5) comprises a piston (51) and a dynamic brake gear ring (54), wherein the piston (51) is located on the inner side of a fixed ring (4), and a pressure chamber (53) capable of pushing the piston (51) to move downward is provided between the piston (51) and the annular support platform (12), wherein the fixed brake gear ring (23) is provided on a support ring (22), and a lower fixed tooth (24) is provided on the upper side of the fixed brake gear ring (23) along the circumferential direction. The upper side of the fixed ring (4) is provided with a lower fixed tooth 2 (43); the dynamic brake tooth ring (54) is fixed on the piston (51) and is located directly above the fixed brake tooth ring (23) and the fixed ring (4); the lower side of the dynamic brake tooth ring (54) is provided with an upper fixed tooth (55) along the circumferential direction; when the piston (51) moves downward, the upper fixed tooth (55) can simultaneously mesh with the lower fixed tooth 1 (24) and the lower fixed tooth 2 (43); and a gear that can be used to adjust the pressure between the fixed ring (4) and the brake frame (5) is also provided between the fixed ring (4) and the brake frame (5). A spring (6) is provided to move the piston (51) upward and reset when the pressure in the cavity (53) is reduced; a lifting rod (7) is provided on the fixing ring (4) and the annular support platform (12); the lifting rod (7) can move relative to the fixing ring (4) and the annular support platform (12); the upper end of the lifting rod (7) is fixedly connected to the dynamic brake gear ring (54); a rotating rod (71) is also rotatably connected in the box body (1); one end of the rotating rod (71) is connected to the lifting rod (7) by a connecting rod (72). A sensing member (73) is fixed to the other end of the rotating rod (71), and a protruding sensing head (74) is symmetrically provided on the sensing member (73), and proximity switches are respectively provided on the box body (1) in front of the two sensing heads (74); a plurality of lower blind holes (45) are provided on the fixing ring (4), and upper blind holes (57) corresponding to the lower blind holes (45) are provided on the dynamic brake gear ring (54), and the two ends of the spring (6) are respectively located in the lower blind hole (45) and the upper blind hole (57).

2. The gear brake mechanism of the CNC horizontal turntable according to claim 1 is characterized in that: A sealing convex ring (41) is provided on the inner side of the fixing ring (4), the sealing convex ring (41) is in contact with the inner wall of the annular support platform (12), and a sealing ring (42) is provided between the sealing convex ring (41) and the inner wall of the annular support platform (12); a piston head (52) is provided at the lower end of the piston (51), the piston head (52) is located directly below the sealing convex ring (41), the piston head (52) and the inner wall of the annular support platform (12) are sealedly connected via a sealing ring (521), the piston (51) and the inner wall of the fixing ring (4) are sealedly connected via a sealing ring (511), and the above-mentioned pressure chamber (53) is formed between the piston head (52), the sealing convex ring (41) and the annular support platform (12).

3. The gear brake mechanism of the CNC horizontal turntable according to claim 1 or 2, characterized in that: The ends of the teeth of the upper fixed teeth (55) are provided with upper abutment bevels (56) on both sides, and the upper abutment bevels (56) are arranged along the radial direction of the dynamic brake gear ring (54); the ends of the teeth of the lower fixed teeth (24) and the lower fixed teeth (43) are provided with lower abutment bevels (44) on both sides, and the lower abutment bevels (44) are arranged along the radial direction of the dynamic brake gear ring (54); when the upper fixed teeth (55) are meshed with the lower fixed teeth (24) and the lower fixed teeth (43), the upper abutment bevels (56) of the upper fixed teeth (55) are in contact with the lower abutment bevels (44) of the lower fixed teeth (24) and the lower abutment bevels (44) of the lower fixed teeth (43).

4. The gear brake mechanism of the CNC horizontal turntable according to claim 1 or 2, characterized in that: The fixed brake gear ring (23) is located on the inner side of the support ring (22), and the fixed brake gear ring (23) and the support ring (22) are integrally formed.

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