Numerically-controlled machine tool rotary table with accurate positioning function and compensation machining method of numerically-controlled machine tool rotary table

Abstract

The invention discloses a numerical control machine tool rotary table with an accurate positioning function and a compensation machining method thereof. The numerical control machine tool rotary table comprises a rotary table body, a driving mechanism and a mounting disc. The brake mechanism is arranged on a rotating shaft of the driving mechanism; the braking mechanism comprises an expansion film and a braking piece, and an oil cavity is formed in the expansion film; the clearance compensation mechanism is arranged in the driving rotating mechanism; the clearance compensation mechanism comprises moving parts and an adjusting mechanism, and the moving parts are rotationally connected to the two ends of a worm in the driving mechanism. A part is stabilized after rotating to a target angle through the brake mechanism, the worm can be moved through the clearance compensation mechanism when the worm is abraded so that the worm gear and the worm can be tightly matched, and normal transmission is ensured.

Description

Technical Field

[0001] The invention relates to a numerical control machine tool turntable with precise positioning function and a compensation processing method thereof, belonging to the technical field of turntables. Background Art

[0002] In the field of CNC machine tools, efficient and precise processing is the key pursuit. As an important component, the mobile turntable plays an irreplaceable role. Its drive system includes motors, transmission devices, etc., which can generate stable and precise power. During operation, the drive system drives the turntable body to rotate, and the CNC machine tool output mechanisms such as grinding installed on the turntable also rotate accordingly. This enables the machine tool to perform multi-directional processing on the workpiece, greatly improving the flexibility and efficiency of processing.

[0003] For example, the Chinese invention patent with the authorization announcement number CN219254786U discloses a dual C-axis steering mechanism for a six-axis machining center, and specifically discloses a horizontally arranged rotating platform and a C-axis turntable arranged in the middle of the rotating platform, the C-axis turntable includes a first C-axis, a second C-axis and a C-axis drive motor, the first C-axis and the second C-axis are arranged in reverse, the end of the first C-axis away from the C-axis drive motor is connected to the first workpiece turntable, and the end of the second C-axis away from the C-axis drive motor is connected to the second workpiece turntable. After the components in the turntable are driven to the appropriate angle, there is a lack of effective stabilization measures. Since vibrations may occur during the operation of the equipment, these components are prone to angle and stroke deviations, which in turn affects the precision and accuracy of the processing and affects the processing quality. In addition, the turntable is connected to the gear box through the C-axis drive motor to rotate the first workpiece turntable and the second workpiece turntable. Due to the direction of its setting, there will be a corresponding worm gear mechanism in the gear box. After the worm gear drive mechanism works for a long time, the worm will inevitably wear. Once the worm is worn to a certain extent, a gap will appear in the fit between it and the worm wheel, affecting normal transmission and the rotation adjustment function of the turntable. Summary of the invention

[0004] The purpose of the present invention is to provide a CNC machine tool turntable with precise positioning function and a processing method thereof. The present invention uses a brake mechanism to stably brake the component after it rotates to a target angle, thereby avoiding travel errors and having an excellent precise positioning function; in addition, the present invention uses a clearance compensation mechanism to move the worm when the worm is worn so that the worm wheel and worm are closely matched to ensure normal transmission.

[0005] The technical solution of the present invention is: a CNC machine tool turntable with a precise positioning function, comprising a turntable body, a drive mechanism using a worm gear transmission is provided on the turntable body, and a mounting plate is connected to the rotation output end of the drive mechanism; and further comprising: The brake mechanism is arranged on the rotating shaft of the driving mechanism; the brake mechanism comprises an expansion membrane and a brake plate, and an oil chamber is arranged in the expansion membrane; the expansion membrane is expanded by injecting hydraulic oil into the oil chamber to push the brake plate to prevent the corresponding rotating shaft from rotating; A clearance compensation mechanism is arranged inside a driving rotation mechanism; the clearance compensation mechanism comprises a moving part and an adjusting mechanism, wherein the moving part is rotatably connected to both ends of a worm inside the driving mechanism; when a gap exists in the transmission due to wear of the worm, the clearance compensation mechanism drives the moving part to move through the adjusting mechanism to compensate for the gap between the worm and the worm wheel.

[0006] The above-mentioned CNC machine tool turntable with precise positioning function, the two ends of the turntable body are respectively provided with a first mounting seat and a rotating seat, a platform is provided between the first mounting seat and the rotating seat; a connecting plate is rotatably connected to the platform, a second mounting seat is provided on the upper part of the other end of the connecting plate, and the mounting plate is rotatably set on the second mounting seat; the driving mechanism includes a first worm gear driving mechanism for driving the platform to rotate, a second worm gear driving mechanism for driving the connecting plate to rotate and a third worm gear driving mechanism for driving the mounting plate to rotate.

[0007] The aforementioned CNC machine tool turntable with precise positioning function, the brake mechanism is respectively arranged on the rotating shafts of the platform, the connecting plate and the mounting plate; the brake mechanism includes a rear end cover arranged on the corresponding rotating shaft, and the expansion membrane is arranged on the inner side of the rear end cover; the brake plate is arranged at the other end of the expansion membrane; the rear end cover is provided with an oil port, which is connected to the oil chamber; the first mounting seat, the platform and the second mounting seat are respectively provided with inner convex rings matching the corresponding brake plates.

[0008] The aforementioned CNC machine tool turntable with precise positioning function, the first worm gear drive mechanism, the second worm gear drive mechanism and the third worm gear drive mechanism have the same structure and all include a motor, the output end of the motor is connected to a worm, and the worm is externally meshed with a worm wheel arranged on the corresponding rotating shaft.

[0009] The aforementioned CNC machine tool turntable with precise positioning function, the adjustment mechanism includes slide grooves arranged on both sides of the first mounting seat, the inner side of the platform and both sides of the second mounting seat and a first inclined surface arranged at the lower end of the moving member, the moving member is slidably connected with the corresponding slide grooves respectively; an interference mechanism is provided on the outer side of the lower end of the moving member, the inner end of the interference mechanism is in contact with a lifting block located below the moving member, the upper end surface of the lifting block is provided with a second inclined surface, the second inclined surface fits with and conflicts with the first inclined surface; the first inclined surface is from high to low from outside to inside.

[0010] The aforementioned CNC machine tool turntable with precise positioning function, the interference mechanism includes a plurality of first threaded holes respectively arranged on both sides of the first mounting seat, the inner side of the platform and both sides of the second mounting seat, the first threaded hole is located below and outside the slide groove; a first bolt is arranged in the first threaded hole, and the inner end of the first bolt passes through the first threaded hole to interfere with the lifting block.

[0011] The aforementioned CNC machine tool turntable with precise positioning function, the two sides of the first mounting seat, the inner side of the platform and the two sides of the second mounting seat are respectively provided with lower protrusions located on the inner side of the upper end of the corresponding slide groove, and the lower protrusions are provided with a second threaded hole; the upper part of the movable part is provided with a first waist-shaped hole, and the first waist-shaped hole is provided with a second bolt, and the threaded end of the second bolt cooperates with the second threaded hole.

[0012] The aforementioned CNC machine tool turntable with precise positioning function has a plurality of mounting plates on both sides of the turntable body, and the mounting plates are provided with second waist-shaped holes.

[0013] The above-mentioned compensation processing method of the CNC machine tool turntable with precise positioning function is to install the workpiece on the mounting plate, and the mounting plate is rotated by the driving mechanism to control the rotation of the workpiece during the processing, so that the angle and position of the workpiece can be flexibly controlled; During the processing, the brake mechanism is used to stabilize the rotating shaft after the driving mechanism turns to a suitable angle, thereby reducing the influence of external forces on the processing; After long-term operation, the worm in the worm gear drive mechanism wears out, causing a gap between it and the worm wheel, making it impossible to transmit normally. The adjustment mechanism in the gap compensation mechanism drives the moving part to move to compensate for the gap between the worm and the worm wheel to ensure normal transmission. Compared with the prior art, the present invention has the following beneficial effects: 1. In the present invention, the turntable body is installed on the XYZ three-axis moving mechanism to realize the movement of the processed workpiece on the XYZ three-axis. The first worm gear driving mechanism is used to rotate the platform, the second worm gear driving mechanism is used to rotate the connecting plate, and the third worm gear driving mechanism is used to rotate the mounting plate to realize the control of the rotation of the workpiece on the ABC three-axis, so that the angle and position of the workpiece can be flexibly controlled to facilitate processing. During the processing, if the parts cannot be firmly fixed, when they are subjected to external forces such as cutting force and inertia force, vibration and slight displacement are easily generated. The platform, the second mounting seat and the mounting plate are stabilized after they are rotated to a suitable angle by the brake mechanism, thereby increasing the processing rigidity, preventing the influence of external forces on the processing, and ensuring the product quality. Under long-term work, the worm in the worm gear driving mechanism will be worn, so that there will be a gap between the worm and the worm wheel, and the transmission cannot be normal. The worm is moved toward and close to the worm wheel by the gap compensation mechanism to ensure normal transmission, which can increase the service life of the worm. Therefore, the present invention achieves the effect of stabilizing the component after rotating it to the target angle through the brake mechanism, and can move the worm when the worm is worn through the clearance compensation mechanism to make the worm wheel and worm gear fit closely, which has the advantages of improving processing quality and reducing maintenance costs.

[0014] 2. In the present invention, after the corresponding worm gear drive mechanism makes the platform, the second mounting seat and the mounting plate rotate to a suitable angle, hydraulic oil is injected into the oil chamber through the oil port. As the hydraulic oil is injected, the expansion membrane gradually expands, causing the brake plate to move toward and fit tightly against the inner convex ring, thereby preventing the platform, the second mounting seat and the mounting plate from continuing to rotate under the action of friction. When the platform, the second mounting seat and the mounting plate need to continue to rotate, the hydraulic oil in the oil chamber is discharged from the oil port, and the expansion membrane is reset, thereby separating the brake plate from the inner convex ring without affecting its rotation.

[0015] 3. In the present invention, when the worm is worn so that a gap appears between it and the worm and the transmission cannot be normal, the first bolt of the interference mechanism is screwed to move it toward the inside of the first threaded hole. When the inner end of the first bolt moves inward, it interferes with the lifting block to make it move inward. Because the second inclined surface of the lifting block fits and interferes with the first inclined surface of the moving part, the lifting block will gradually rise during the movement of the lifting block until the worm contacts the worm wheel and the lifting block cannot move, so that it can transmit normally. Then, the second bolt is passed through the first waist-shaped hole and screwed into the second threaded hole to further stabilize the moving part. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is a schematic diagram of the rear structure of the present invention; Figure 3 It is a structural diagram of the brake mechanism; Figure 4 yes Figure 3 A partially enlarged schematic diagram of Figure 5 It is a structural schematic diagram of the gap compensation mechanism; Figure 6 yes Figure 5 A partially enlarged schematic diagram of .

[0017] The marks in the attached drawings are: 1-turntable body, 2-first mounting seat, 3-rotating seat, 4-platform, 5-first worm gear drive mechanism, 6-second worm gear drive mechanism, 7-connecting plate, 8-second mounting seat, 9-third worm gear drive mechanism, 10-mounting plate, 11-brake stop mechanism, 12-clearance compensation mechanism, 13-mounting plate, 14-second waist hole, 15-third threaded hole, 20-rear end cover, 21-expansion Expansion film, 22-oil chamber, 23-brake plate, 24-oil port, 25-inner convex ring, 30-motor, 31-worm, 32-worm wheel, 40-moving part, 41-slideway, 42-first inclined surface, 43-first threaded hole, 44-first bolt, 45-lifting block, 46-second inclined surface, 47-lower convex block, 48-second threaded hole, 49-first waist hole, 50-second bolt, 51-adjustment mechanism, 52-resistance mechanism. DETAILED DESCRIPTION

[0018] The present invention is further described below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0019] Embodiment: A CNC machine tool turntable with precise positioning function, comprising: Figure 1-6 As shown, it includes a turntable body 1, which is made of high-strength cast iron, has good rigidity and stability, and can effectively support the weight of the entire turntable and the load generated during operation; the turntable body 1 is provided with a driving mechanism using a worm gear transmission, and the rotating output end of the driving mechanism is connected to a mounting plate 10, which is made of aluminum alloy and has a fine surface processing to ensure the installation accuracy; a plurality of third threaded holes 15 are provided on the mounting plate 10, and the through holes on the external workpiece fixture are aligned with the third threaded holes 15 on the mounting plate 10 and screwed into the third bolts, so that the fixture is fixed to the mounting plate 10, so that a suitable fixture can be selected according to different workpieces; the turntable also includes: Braking mechanism 11, such as Figure 3 and 4As shown, it is arranged on the rotating shaft of the driving mechanism; the brake mechanism 11 includes an expansion membrane 21 and a brake plate 23, the brake plate 23 is made of a material with a large friction coefficient, such as a copper-based powder metallurgy material, which can generate sufficient friction; an oil chamber 22 is arranged in the expansion membrane 21; the expansion membrane 21 is expanded by injecting hydraulic oil into the oil chamber 22, pushing the brake plate 23 to prevent the corresponding rotating shaft from rotating; the brake mechanism 11 is respectively arranged on the rotating shafts of the platform 4, the connecting plate 7 and the mounting plate 10; the brake mechanism 11 includes a rear end cover 20 arranged on the corresponding rotating shaft, the expansion membrane 21 is arranged on the inner side of the rear end cover 20; the brake plate 23 is arranged at the other end of the expansion membrane 21; an oil port 24 is provided on the rear end cover 20, and the oil port 24 is in contact with the oil chamber 22 The first mounting seat 2, the platform 4 and the second mounting seat 8 are connected; the first mounting seat 2, the platform 4 and the second mounting seat 8 are respectively provided with an inner convex ring 25 matched with the corresponding brake plate 23; when the corresponding worm wheel 32 and worm 31 drive mechanism make the platform 4, the second mounting seat 8 and the mounting plate 10 rotate to a suitable angle, hydraulic oil is injected into the oil chamber 22 through the oil port 24, and the expansion membrane 21 gradually expands with the injection of hydraulic oil, so that the brake plate 23 moves toward the inner convex ring 25 and adheres to it, and prevents the platform 4, the second mounting seat 8 and the mounting plate 10 from continuing to rotate under the action of friction; when the platform 4, the second mounting seat 8 and the mounting plate 10 need to continue to rotate, the hydraulic oil in the oil chamber 22 is discharged from the oil port 24, and the expansion membrane 21 will be reset, so that the brake plate 23 is separated from the inner convex ring 25 without affecting its rotation; The clearance compensation mechanism 12, such as Figure 5 and 6As shown, it is arranged inside the driving rotation mechanism; the clearance compensation mechanism 12 includes a moving member 40 and an adjusting mechanism 51, and the moving member 40 is rotatably connected to the two ends of the worm inside the driving mechanism; when the worm is worn and there is a gap in the transmission, the clearance compensation mechanism 12 drives the moving member 40 to move through the adjusting mechanism 51 to compensate for the gap between the worm and the worm wheel; the adjusting mechanism includes a slide groove 41 arranged on both sides of the first mounting seat 2, the inner side of the platform 4 and both sides of the second mounting seat 8, and a first inclined surface 42 arranged at the lower end of the moving member 40, and the moving member 40 is respectively connected to the corresponding The sliding groove 41 is slidably connected; the outer side of the lower end of the moving member 40 is provided with a resistance mechanism 52, the inner end of the resistance mechanism 52 is in resistance with a lifting block 45 located below the moving member 40, and the upper end surface of the lifting block 45 is provided with a second inclined surface 46, and the second inclined surface 46 fits and conflicts with the first inclined surface 42; the first inclined surface 42 is from high to low from outside to inside; the resistance mechanism 52 includes a plurality of first threaded holes 43 respectively arranged on both sides of the first mounting seat 2, the inner side of the platform 4 and both sides of the second mounting seat 8, and the first threaded hole 43 is located on the lower outer side of the sliding groove 41; the first threaded hole 43 A first bolt 44 is provided inside, and the inner end of the first bolt 44 passes through the first threaded hole 43 and contacts the lifting block 45; lower protrusions 47 located on the inner side of the upper end of the corresponding slide groove 41 are respectively provided on both sides of the first mounting seat 2, the inner side of the platform 4 and the two sides of the second mounting seat 8, and a second threaded hole 48 is provided on the lower protrusion 47; a first waist-shaped hole 49 is provided on the upper part of the moving member 40, and a second bolt 50 is provided in the first waist-shaped hole 49, and the threaded end of the second bolt 50 cooperates with the second threaded hole 48; when the worm 31 is worn so that a gap appears between it and the worm 31 and it cannot transmit normally, the worm 31 is not rotated normally. By screwing the first bolt 44 of the resistance mechanism 52, it moves toward the inside of the first threaded hole 43. When the inner end of the first bolt 44 moves inward, it resists the lifting block 45 to move it inward. Because the second inclined surface 46 of the lifting block 45 fits and conflicts with the first inclined surface 42 of the moving member 40, the lifting block 45 gradually rises during its movement until the worm 31 contacts the worm wheel 32, making the lifting block 45 unable to move, so that it can be normally transmitted. Then, the second bolt 50 passes through the first waist-shaped hole 49 and is screwed into the second threaded hole 48 to further stabilize the moving member 40. Preferably, if Figure 1 and 2As shown, the two ends of the turntable body 1 are respectively provided with a first mounting seat 2 and a rotating seat 3, and a platform 4 is provided between the first mounting seat 2 and the rotating seat 3. The platform 4 is made of aluminum alloy, light in weight and has a certain strength, which is convenient for flexible rotation; the platform 4 is rotatably connected with a connecting plate 7, which is made of stainless steel, has good corrosion resistance and strength, and is used to connect the second worm gear drive mechanism 6 and the second mounting seat 8; the other end of the connecting plate 7 is provided with a second mounting seat 8, and the mounting plate 10 is rotatably arranged on the second mounting seat 8; the driving mechanism includes a first worm gear drive mechanism 5 for driving the platform 4 to rotate, a second worm gear drive mechanism 6 for driving the connecting plate 7 to rotate, and a third worm gear drive mechanism 9 for driving the mounting plate 10 to rotate. The first worm gear drive mechanism 5 rotates the platform 4, the second worm gear drive mechanism 6 rotates the connecting plate 7, and the third worm gear drive mechanism 9 rotates the mounting plate 10, so as to realize the control of the rotation of the workpiece on the three axes of ABC.

[0020] Preferably, if Figure 5 As shown, the first worm gear drive mechanism 5, the second worm gear drive mechanism 6 and the third worm gear drive mechanism 9 have the same structure, and all include a motor 30, the output end of the motor 30 is connected to a worm 31, and the worm 31 is externally meshed with a worm wheel 32 arranged on a corresponding rotating shaft. The motor 30 rotates the worm 31, and the worm 31 rotates the worm wheel 32 through meshing, thereby controlling the rotation of the workpiece on the three axes of ABC.

[0021] Preferably, if Figure 1 and 2 As shown, a plurality of mounting plates 13 are provided on both sides of the turntable body 1, and a second waist-shaped hole 14 is provided on the mounting plate 13. The second waist-shaped hole 14 on the mounting plate corresponds to the fourth threaded hole on the XYZ moving mechanism and the fourth bolt is screwed in, so that the turntable body is fixedly connected with it.

[0022] In this embodiment, a compensation processing method for a CNC machine tool turntable with a precise positioning function is also provided, comprising: Movement of the workpiece in the XYZ three-axis: The turntable body 1 of the turntable is matched with the fourth threaded hole on the XYZ moving mechanism through the second waist hole 14 on the mounting plate 13, and the fourth bolt is screwed in to achieve fixed connection. In this way, with the drive of the XYZ three-axis moving mechanism, the entire turntable together with the workpiece mounted on the mounting plate 10 can be moved in the three linear directions of X, Y, and Z, so as to flexibly adjust the position of the workpiece in space to meet different processing requirements.

[0023] Rotation of the workpiece on the three axes of ABC: After the motor 30 in the first worm-gear drive mechanism 5, the second worm-gear drive mechanism 6 and the third worm-gear drive mechanism 9 is started as a power source, the worm 31 connected to the output end is driven to rotate. Since the worm 31 is externally meshed with the platform 4, the connecting plate 7 and the worm wheel 32 on the rotating shaft of the mounting plate 10, the rotation of the worm 31 will cause the worm wheel 32 to rotate, thereby realizing that the first worm-gear drive mechanism 5 rotates the platform 4, the second worm-gear drive mechanism 6 drives the connecting plate 7 to rotate, and the third worm-gear drive mechanism 9 drives the mounting plate 10 to rotate. Through the coordinated work of these three worm wheel 32 and worm 31 drive mechanisms, the rotation of the workpiece on the three rotating axes of A, B and C can be accurately controlled, and the angle of the workpiece can be flexibly adjusted to facilitate all-round processing operations on it.

[0024] Braking mechanism 11 stabilizes components: During the processing, when the first worm gear drive mechanism 5, the second worm gear drive mechanism 6 and the third worm gear drive mechanism 9 rotate the platform 4, the second mounting seat 8 and the mounting plate 10 to a suitable processing angle, the braking mechanism 11 starts to work. Hydraulic oil is injected into the oil chamber 22 in the expansion membrane 21 through the oil port 24 on the rear end cover 20. As the hydraulic oil is continuously injected, the expansion membrane 21 gradually expands. The expansion of the expansion membrane 21 pushes the braking plate 23 to move toward the inner convex ring 25 until the braking plate 23 fits tightly with the inner convex ring 25. Under the friction force generated by the fit between the two, the platform 4, the second mounting seat 8 and the mounting plate 10 are firmly fixed in the current position to prevent them from vibrating and slightly displacing due to external forces such as cutting force and inertia force, effectively increasing the processing stiffness, ensuring the stability of the processing process, and thus ensuring the processing quality of the product. When it is necessary to continue rotating these components, the hydraulic oil in the oil chamber 22 is discharged from the oil port 24, the expansion membrane 21 is reset, the brake plate 23 is separated from the inner convex ring 25, and the components can continue to rotate normally.

[0025] The clearance compensation mechanism 12 ensures transmission: during the long working process, the worm 31 in the corresponding worm gear drive mechanism will inevitably wear out, resulting in a gap in the cooperation between the worm 31 and the worm wheel 32, affecting the normal transmission. At this time, the clearance compensation mechanism 12 begins to play a role. The first bolt 44 of the conflicting mechanism 52 is screwed to move it inside the first threaded hole 43, and the inner end of the first bolt 44 pushes the lifting block 45 of the adjustment mechanism 51 to move inward. Since the second inclined surface 46 of the lifting block 45 fits and conflicts with the first inclined surface 42 of the moving member 40, the movement of the lifting block 45 will cause the moving member 40 to gradually rise along the chute 41. During the rising process of the moving member 40, the worm 31 is driven to rise together until the worm 31 and the worm wheel 32 are in close contact again, and the normal transmission state is restored. Afterwards, the second bolt 50 is passed through the first waist-shaped hole 49 on the moving member 40 and screwed into the second threaded hole 48 on the lower protrusion 47, further stabilizing the moving member 40 to ensure the close cooperation of the worm 31 and the worm wheel 32. By adjusting the clearance compensation mechanism 12, the service life of the worm 31 can be effectively extended, and the cost and downtime caused by frequent replacement of worn parts can be reduced.

[0026] In summary, the present invention uses a brake mechanism to stably stop the component after it is rotated to the target angle, thereby avoiding walking errors and having an excellent precise positioning function; in addition, the present invention uses a clearance compensation mechanism to move the worm when the worm is worn so that the worm wheel and worm gear fit closely and ensure normal transmission, which has the advantages of improving processing quality and reducing maintenance costs.

Claims

1. A CNC machine tool turntable with a precise positioning function, comprising a turntable body (1), a drive mechanism using a worm gear transmission is provided on the turntable body (1), and a mounting plate (10) is connected to a rotation output end of the drive mechanism; the characteristics are: Also includes: A brake mechanism (11) is arranged on a rotating shaft of the driving mechanism; the brake mechanism (11) comprises an expansion membrane (21) and a brake plate (23); an oil chamber (22) is arranged in the expansion membrane (21); hydraulic oil is injected into the oil chamber (22) to expand the expansion membrane (21), thereby pushing the brake plate (23) to prevent the corresponding rotating shaft from rotating; A clearance compensation mechanism (12) is arranged inside a driving rotation mechanism; the clearance compensation mechanism (12) comprises a moving member (40) and an adjustment mechanism (51); the moving member (40) is rotatably connected to two ends of a worm inside the driving mechanism; when the worm is worn and a transmission clearance exists, the clearance compensation mechanism (12) drives the moving member (40) to move through the adjustment mechanism (51) to compensate for the clearance between the worm and the worm wheel.

2. The CNC machine tool turntable with precise positioning function according to claim 1, characterized in that: A first mounting seat (2) and a rotating seat (3) are respectively provided at both ends of the turntable body (1), and a platform (4) is provided between the first mounting seat (2) and the rotating seat (3); a connecting plate (7) is rotatably connected to the platform (4), a second mounting seat (8) is provided on the upper portion of the other end of the connecting plate (7), and the mounting plate (10) is rotatably arranged on the second mounting seat (8); the driving mechanism comprises a first worm gear driving mechanism (5) for driving the platform (4) to rotate, a second worm gear driving mechanism (6) for driving the connecting plate (7) to rotate, and a third worm gear driving mechanism (9) for driving the mounting plate (10) to rotate.

3. The CNC machine tool turntable with precise positioning function according to claim 2, characterized in that: The brake mechanism (11) is respectively arranged on the platform (4), the connecting plate (7) and the rotating shaft of the mounting plate (10); the brake mechanism (11) comprises a rear end cover (20) arranged on the corresponding rotating shaft, the expansion membrane (21) is arranged on the inner side of the rear end cover (20); the brake plate (23) is arranged at the other end of the expansion membrane (21); the rear end cover (20) is provided with an oil port (24), the oil port (24) is connected to the oil chamber (22); the first mounting seat (2), the platform (4) and the second mounting seat (8) are respectively provided with an inner convex ring (25) matching the corresponding brake plate (23).

4. The CNC machine tool turntable with precise positioning function according to claim 2, characterized in that: The first worm gear drive mechanism (5), the second worm gear drive mechanism (6) and the third worm gear drive mechanism (9) have the same structure and all comprise a motor (30), the output end of the motor (30) being connected to a worm (31), the worm (31) being externally meshed with a worm wheel (32) arranged on a corresponding rotating shaft.

5. The CNC machine tool turntable with precise positioning function according to claim 3, characterized in that: The adjustment mechanism comprises slide grooves (41) arranged on both sides of the first mounting seat (2), the inner side of the platform (4) and both sides of the second mounting seat (8) and a first inclined surface (42) arranged at the lower end of the moving member (40), and the moving member (40) is slidably connected with the corresponding slide grooves (41) respectively; a resistance mechanism (52) is provided on the outer side of the lower end of the moving member (40), and the inner end of the resistance mechanism (52) is in resistance with a lifting block (45) located below the moving member (40); a second inclined surface (46) is provided on the upper end surface of the lifting block (45), and the second inclined surface (46) is matched with and in resistance with the first inclined surface (42); the first inclined surface (42) is high to low from the outside to the inside.

6. The CNC machine tool turntable with precise positioning function according to claim 5, characterized in that: The interference mechanism (52) comprises a plurality of first threaded holes (43) respectively arranged on both sides of the first mounting seat (2), the inner side of the platform (4) and both sides of the second mounting seat (8), wherein the first threaded hole (43) is located below and outside the slide groove (41); a first bolt (44) is arranged in the first threaded hole (43), and the inner end of the first bolt (44) passes through the first threaded hole (43) and interferes with the lifting block (45).

7. The CNC machine tool turntable with precise positioning function according to claim 5, characterized in that: Lower protrusions (47) located on the inner side of the upper end of the corresponding slide groove (41) are respectively provided on both sides of the first mounting seat (2), the inner side of the platform (4) and the two sides of the second mounting seat (8), and a second threaded hole (48) is provided on the lower protrusion (47); a first waist-shaped hole (49) is provided on the upper part of the moving member (40), and a second bolt (50) is provided in the first waist-shaped hole (49), and the threaded end of the second bolt (50) matches the second threaded hole (48).

8. The CNC machine tool turntable with precise positioning function according to claim 1, characterized in that: A plurality of mounting plates (13) are provided on both sides of the turntable body (1), and a second waist-shaped hole (14) is provided on the mounting plate (13).

9. The compensation processing method of a CNC machine tool turntable with precise positioning function according to any one of claims 1 to 7, characterized in that: The workpiece is mounted on the mounting plate, and the mounting plate is rotated by the driving mechanism to control the rotation of the workpiece during the processing, so that the angle and position of the workpiece can be flexibly controlled; During the processing, the brake mechanism is used to stabilize the rotating shaft after the driving mechanism turns to a suitable angle, thereby reducing the influence of external forces on the processing; After long-term operation, the worm in the worm gear drive mechanism wears out, causing a gap between it and the worm wheel, making it impossible to transmit normally. The adjustment mechanism in the gap compensation mechanism drives the moving part to move to compensate for the gap between the worm and the worm wheel to ensure normal transmission.

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