A motor-driven turntable

Abstract

The present invention relates to the technical field of machine tool equipment, and discloses a motor direct-driven turntable, including a housing, a mandrel, a bearing, a turntable, a tail plate with a mounting hole, and a torque motor for driving the mandrel; the mandrel is arranged in the housing through a bearing, the first and second ends of the mandrel are fixedly connected to the turntable, and the tail end of the mandrel is arranged through the mounting hole; the outer diameter of the first end of the mandrel is larger than the outer diameter of the tail end of the mandrel, and a receiving cavity is formed between the tail end of the mandrel and the housing; the torque motor is arranged in the receiving cavity, the motor mover of the torque motor is fixed at the tail end of the mandrel, the orthographic projection of the motor mover on the longitudinal section of the mandrel is located at the tail end of the mandrel, and the motor stator and the motor mover of the torque motor are coaxially arranged with the mandrel; and also includes a tail end protection component, the tail end protection component includes a first protection member located in the mounting hole and a second protection member fixedly assembled with the tail plate to encapsulate the first protection member in the mounting hole. The structure is compact, the rotation accuracy is high, and it can meet the use requirements in complex processing environments.

Description

Technical Field

[0001] The invention relates to the technical field of machine tool equipment, and in particular to a motor-direct-driven turntable. Background Art

[0002] The motor direct-drive turntable is directly driven by a rotary motor and has excellent dynamic performance and positioning accuracy. It is mainly used in machine tools such as machining centers as a vertical fourth axis, or as a multi-station continuous processing indexing turntable.

[0003] The motor-driven turntable mainly includes a housing, a mandrel in the housing, and a torque motor for driving the mandrel. A turntable is fixed on the top of the mandrel for mounting the workpiece to be processed. The mandrel is driven by the torque motor to drive the turntable to rotate as required to deliver the workpiece to the required processing position. The existing motor-driven turntable usually has the following structural deficiencies:

[0004] First, a sealing ring is usually used to seal the tail end of the core shaft and the bottom plate of the housing, or a single labyrinth airtight structure is set to achieve sealing to protect the torque motor, but the sealing capacity is limited and cannot meet the protection requirements of the turntable for the torque motor in a complex working environment;

[0005] Second, the torque motor is installed at the bottom end of the core shaft, which causes the overall axial height of the turntable to be relatively high. For turntables with larger radial dimensions or turntables that need to carry mass workpieces, the higher axial height will cause the turntable to produce end diameter runout errors during rotation and increase the risk of the turntable overturning during use. Summary of the invention

[0006] The present invention aims to solve at least one of the technical problems existing in the prior art, and proposes a motor-driven turntable with a compact structure and reliable sealing and protection performance, which can improve the working reliability and rotation accuracy of the turntable.

[0007] The present invention proposes a motor-driven turntable, comprising a housing, a core shaft, a bearing, a turntable, a tail plate with a mounting hole, and a torque motor for driving the core shaft; the core shaft is arranged in the housing through the bearing, the head and ends of the core shaft are fixedly connected to the turntable, and the tail end of the core shaft is arranged through the mounting hole; the outer diameter of the head end of the core shaft is larger than the outer diameter of the tail end of the core shaft, and a receiving cavity is formed between the tail end of the core shaft and the housing; the torque motor is arranged in the receiving cavity, the motor mover of the torque motor is fixed at the tail end of the core shaft, the orthographic projection of the motor mover on the longitudinal section of the core shaft is located at the tail end of the core shaft, and the motor stator and the motor mover of the torque motor are coaxially arranged with the core shaft; and a tail end protection component is also included The tail end protection assembly includes a first protection member located in the mounting hole and a second protection member fixedly assembled with the tail plate to encapsulate the first protection member in the mounting hole; the first protection member includes a protection disc body fixedly connected to the core shaft and a central cylinder body extending from the protection disc body; the second protection member has a through hole and an air uniforming groove connected to the air pipe, and the central cylinder body is inserted in the through hole; a first airtight gap connected to the air uniforming groove is formed between the opposite sides of the second protection member and the protection disc body, and a second airtight gap connected to the first airtight gap is formed between the outer wall of the central cylinder body and the inner wall of the through hole, and the second airtight gap and the first airtight gap are not located in the same plane.

[0008] In some preferred embodiments, a first step portion is provided near the head end of the core shaft, a second step portion is provided near the tail end of the core shaft, the bearing is assembled on the first step portion, and the radial portion of the motor mover is fixed on the second step portion.

[0009] In some preferred embodiments, the motor stator is fixed on the tail plate, and the motor stator is located on the outer peripheral side of the motor mover.

[0010] In some preferred embodiments, the outer wall of the central cylinder and / or the inner wall of the through hole are provided with a plurality of first annular grooves, and the groove wall of each first annular groove from the groove bottom to the groove mouth is arranged to be inclined toward the rear end of the central cylinder so that an air curtain with a plurality of air flow vortices is formed when the air flow flows through the second airtight gap.

[0011] In some preferred embodiments, the tail end of the central cylinder has a sealing disk, and the outer diameter of the sealing disk is larger than the outer diameter of the central cylinder; the matching gap between the sealing disk and the second protective member forms a first labyrinth airtight structure located in the second airtight gap.

[0012] In some preferred embodiments, the first labyrinth airtight structure includes: a second annular protrusion provided on the sealing disk, a second annular groove provided on the inner wall of the through hole, the second annular protrusion is inserted into the second annular groove and the two are clearance-matched.

[0013] In some preferred embodiments, the second protective member also includes a third annular groove located on the outer side of the gas uniforming groove, and the third annular groove is spaced apart from the gas uniforming groove; the first protective member is provided with a third annular protrusion, and the third annular protrusion is inserted into the third annular groove, and the fitting gap between the two forms a third airtight gap connected to the gas uniforming groove.

[0014] In some preferred embodiments, a sealing member is provided at the end of the third airtight gap opposite to the gas uniforming groove, and the sealing member is located between the first protective member and the second protective member.

[0015] In some preferred embodiments, the sealing member is an oil seal; a fixing platform is provided on the second protective member, the oil seal is fixed on the fixing platform, and the oil seal abuts against the outer side wall of the first protective member.

[0016] In some preferred embodiments, a first sealing ring is provided between the first protective member and the tail end of the core shaft, and a second sealing ring is provided between the outer side wall of the second protective member and the tail plate.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The present invention forms an assembly cavity between the tail end of the core shaft and the housing to install the torque motor, and arranges the orthographic projection of the motor rotor in the longitudinal section to be located at the tail end of the core shaft, so that the torque motor does not increase the axial height of the core shaft, thereby making the turntable structure compact, which is beneficial to reducing the end jump error of the turntable relative to the torque motor, and is also beneficial to improving the overturning rigidity and rotation accuracy of the turntable.

[0019] 2. The present invention further optimizes the structure of the tail end protection assembly, and forms a first airtight gap and a second airtight gap that are not located in the same plane on at least two adjacent sides of the first protection member and the second protection member, respectively. This can prevent processing fluid, debris generated by processing and other debris from entering the turntable during the use of the turntable in various complex processing environments. It can not only protect the torque motor from being damaged, but also prevent debris from entering the turntable and interfering with the rotation of the core shaft, thereby further improving the rotation accuracy, working stability and service life of the turntable. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of the motor direct-driven turntable.

[0021] Figure 2 It is a schematic diagram of the exploded structure of the motor direct-driven turntable.

[0022] Figure 3 It is a three-dimensional structural schematic diagram of the fixed assembly of the core shaft and the turntable.

[0023] Figure 4 The invention is a schematic diagram of the assembly structure of the tail end protection component of the motor direct-driven turntable relative to the tail plate.

[0024] Figure 5 It is a schematic diagram of the three-dimensional structure of the first protective element.

[0025] Figure 6 It is a cross-sectional structural diagram of a motor-driven turntable.

[0026] Figure 7 yes Figure 6 A partial enlarged view of point A in the middle. DETAILED DESCRIPTION

[0027] In order to further explain the technical means and effects adopted by the present application to achieve the predetermined purpose, the specific implementation methods, structures, features and effects of the present application are described in detail below in conjunction with the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "embodiment" does not necessarily refer to the same embodiment. In addition, specific features, structures, or characteristics in one or more embodiments may be combined in any suitable form.

[0028] Combination Figure 1-Figure 7 As shown, the present invention discloses a motor-driven turntable (referred to as a "turntable"), which includes a housing 1, a core shaft 2 rotatably arranged in the housing 1 through a bearing 3, a turntable 4 fixed to the front and rear ends of the core shaft 2, a tail plate 5, and a tail end protection assembly, wherein the tail end of the core shaft 2 is pivotally connected to the tail plate 5, and the tail end protection assembly is assembled on the tail plate 5 to seal the assembly gap between the tail end of the core shaft 2 and the tail plate 5. Among them, the turntable 4 is used to load the workpiece to be processed, so as to drive the workpiece to rotate as required when cooperating with the CNC machine tool for processing, and accurately deliver the workpiece to the processing position and position and fix it.

[0029] A torque motor for driving the core shaft 2 is arranged in the housing 1, and the torque motor includes a motor stator 81 fixed in the housing 1 and a motor mover 82 fixedly connected to the core shaft 2, and the motor mover 82 and the motor stator 81 are arranged coaxially with the core shaft 2. The motor mover 82 is driven by the motor stator 81 to drive the core shaft 2 to rotate as required.

[0030] See Figure 3 As shown, the outer diameter of the first end of the mandrel 2 is set to be larger than the outer diameter of the tail end of the mandrel 2. This can not only reduce the rotational inertia of the mandrel 2, but also make the positioning and stopping control of the turntable more accurate, thereby improving the rotation accuracy of the turntable; at the same time, the larger outer diameter of the first end of the mandrel 2 is convenient for fixing and assembling with a turntable with a larger radial size, thereby reducing the error generated during the rotation of the turntable, and further improving the rotation accuracy of the turntable.

[0031] At the same time, the outer diameter of the tail end of the core shaft 2 is small, and a receiving cavity is formed between the housing 1 and the tail end of the core shaft 2, and the torque motor is arranged in the receiving cavity. Therefore, the receiving cavity not only provides an assembly space for the torque motor, but also a larger receiving cavity is conducive to improving the heat dissipation performance of the electromagnetic coil in the motor stator 81, thereby ensuring the working stability of the torque motor.

[0032] Specifically, the motor mover 82 is fixed to the tail end of the core shaft 2, and the orthographic projection of the motor mover 82 on the longitudinal section passing through the central axis of the core shaft 2 is located at the tail end of the core shaft 2, so that the tail end position of the motor mover 82 will not extend out of the tail end of the core shaft 2; the tail end of the motor stator 81 is fixed on the tail plate 5, and the motor stator 81 is located on the outer peripheral side of the motor mover 82.

[0033] Such a structure brings at least the following technical effects: first, the torque motor is arranged close to the tail end of the turntable, but the tail end position of the motor mover 82 does not extend out of the tail end of the core shaft 2, so that the torque motor does not increase the axial height of the turntable, which is beneficial to reducing the rotation error of the turntable and improving the anti-overturning rigidity of the turntable; second, since the motor stator 81 is fixed on the tail plate 5, when the tail plate 5 is removed, the motor stator 81 can be taken out together. After the motor stator 81 is taken out, the space of the accommodating cavity is larger, which is convenient for exposing the motor mover 82, thereby facilitating the subsequent inspection and maintenance of the torque motor.

[0034] A first step portion 21 is provided near the head end of the mandrel 2, and a second step portion 22 is provided near the tail end of the mandrel 2, so the outer diameter of the first step portion 21 is greater than the outer diameter of the second step portion 22. The bearing 3 is assembled on the first step portion 21 arranged near the head end of the mandrel 2, and the radial portion of the motor mover 82 is fixed on the second step portion 22 of the mandrel 2, so as to facilitate assembly and fixation.

[0035] The present invention also assembles a tail end protection component on the tail plate 5, and uses the tail end protection component to seal the assembly gap between the tail end of the core shaft 2 and the tail plate 5. By optimizing the structure of the tail end protection component, it can meet the requirements of preventing processing fluid, debris generated by processing and other debris from entering the turntable during the use of the turntable in various complex processing environments, which can not only protect the torque motor from being easily damaged, but also prevent debris from entering the turntable to interfere with the rotation of the core shaft 2, thereby improving the rotation accuracy, working stability and service life of the turntable.

[0036] Specifically, the tail end protection assembly includes a first protection member 6 and a second protection member 7. The first protection member 6 is fixedly connected to the tail end of the core shaft 2, so that the first protection member 6 rotates as needed with the core shaft 2. The tail plate 5 is provided with a mounting hole 51, and the tail end of the core shaft 2 is arranged through the mounting hole 51; the second protection member 7 is fixedly assembled with the tail plate 5 to encapsulate the first protection member 6 in the mounting hole 51, and the second protection member is provided with an air-distributing groove 72 connected to the air pipe 79, and at least the gap between the two adjacent side surfaces of the second protection member 7 and the corresponding side surfaces of the first protection member 6 is matched to form an airtight gap.

[0037] The first protection member 6 includes a protection disc 61 fixedly connected to the core shaft 2 and a central cylinder 62 extending from the protection disc 61 ; the second protection member 7 has a through hole 71 , and the central cylinder 62 is inserted into the through hole 71 .

[0038] The airtight gap formed between the second protective member 7 and the first protective member 6 includes: a first airtight gap connected to the air uniforming groove 72 formed between the second protective member 7 and the opposite sides of the protective disc body 61; and a second airtight gap connected to the first airtight gap formed between the outer wall of the central cylinder 62 and the inner wall of the through hole 71.

[0039] The second airtight gap and the first airtight gap are not located in the same plane, so that the airtight gap formed by the clearance between the first protective member 6 and the second protective member 7 is not planar, which is beneficial to improving the sealing and protection performance of the airtight gap.

[0040] For example, in the embodiment shown in the drawings, the first airtight gap is distributed in a radial plane, and the second airtight gap is distributed in an axial cylindrical surface.

[0041] When the air pipe 79 injects protective gas into the air uniforming groove 72, the protective gas fills the air uniforming groove 72, and then the protective gas enters the first airtight gap from the air uniforming groove 72, and is discharged from the first airtight gap through the second airtight gap, so that the matching gap between the first protective member 6 and the second protective member 7 forms an air curtain seal to prevent processing fluid and processing debris from entering the turntable through the gap.

[0042] In some preferred embodiments, the outer wall of the central cylinder 62 and / or the inner wall of the through hole 71 are provided with a plurality of first annular grooves 621 , and the groove wall of each first annular groove 621 from the groove bottom to the groove mouth is arranged to be inclined toward the tail end of the central cylinder 62 .

[0043] After the protective gas enters the second airtight gap, when it flows through each first annular groove 621, the inclined groove wall of each first annular groove 621 will cause the airflow to be locally accelerated to form a vortex, thereby forming an air curtain with several airflow vortices in the second airtight gap, which is beneficial to improving the air curtain sealing performance of the second airtight gap.

[0044] It is preferred to set a plurality of first annular grooves 621 on the outer wall of the central cylinder 62, so that the first protective member 6 rotates with the core shaft 2, so that the airflow generates a centrifugal force, and it is easier to form an airflow vortex under the synergistic effect of the inclined groove wall guidance. Furthermore, there is a sealing disk 63 at the tail end of the central cylinder 62, and the sealing disk 63 and the central cylinder 62 are an assembled structure or an integrally formed structure; the outer diameter of the sealing disk 63 is larger than the outer diameter of the central cylinder 62. Among them, the fitting gap between the sealing disk 63 and the second protective member 7 forms a part of the second airtight gap. The fitting gap between the sealing disk 63 and the second protective member 7 can be used to further change the flow direction of the airflow in the second airtight gap to improve the airtight effect.

[0045] The matching gap between the sealing disc 63 and the second protective member 7 forms a first labyrinth airtight structure, and the first labyrinth airtight structure is used to improve the airtight performance of the second airtight gap. Specifically, the sealing disc 63 is provided with a second annular protrusion 631, and the inner wall of the through hole 71 is correspondingly provided with a second annular groove 711, and the second annular protrusion is inserted into the second annular groove and the two are matched with each other.

[0046] At the same time, since the sealing disk 63 rotates with the core shaft 2, the centrifugal force generated by the rotation will throw out the processing fluid and other debris entering from the end of the first maze airtight structure, making it difficult for the processing fluid and other debris to enter the second airtight gap, which is beneficial to further improve the airtight protection performance of the turntable.

[0047] There is also a second labyrinth airtight structure between the first protective member 6 and the second protective member 7. The second labyrinth airtight structure is located on the outer peripheral side of the gas-uniform groove 72, and the second airtight gap is mainly formed by the second labyrinth airtight structure. Specifically, the second protective member 7 also includes a third annular groove 73 located on the outer side of the gas-uniform groove 72, and the third annular groove 73 is spaced apart from the gas-uniform groove 72; the first protective member 6 is provided with a third annular protrusion 64, and the third annular protrusion 64 is inserted into the third annular groove 73, and the matching gap between the two forms a third airtight gap connected to the gas-uniform groove.

[0048] In order to further improve the sealing protection effect on the tail end of the turntable, a sealing member 91 is provided at the end of the third airtight gap relative to the gas uniforming groove 72. The sealing member 91 is located between the first protection member 6 and the second protection member 7.

[0049] For example, the sealing member 91 is an oil seal; a fixing platform is provided on the second protective member 7, the oil seal is fixed on the fixing platform, and the oil seal abuts against the outer side wall of the first protective member 6 to maintain a reliable sealing connection relationship.

[0050] In order to further improve the sealing and protection effect of the tail end of the turntable, a first sealing ring 92 is provided between the first protective member 6 and the tail end of the core shaft 2, and the first sealing ring 92 is used to seal the assembly gap between the first protective member 6 and the tail end of the core shaft 2; a second sealing ring 93 is provided between the outer wall of the second protective member 7 and the tail plate 5, and the second sealing ring 93 is used to seal the assembly gap between the outer wall of the second protective member 7 and the tail plate 5.

[0051] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A motor-driven turntable, comprising a housing (1), a spindle (2), a bearing (3), a turntable (4), a tail plate (5) having a mounting hole (51), and a torque motor for driving the spindle (2); the spindle (2) is arranged in the housing (1) through the bearing (3), the front and rear ends of the spindle (2) are fixedly connected to the turntable (4), and the rear end of the spindle (2) is arranged through the mounting hole (51); the characteristics are: The outer diameter of the front end of the core shaft (2) is greater than the outer diameter of the rear end of the core shaft (2), and a receiving cavity is formed between the rear end of the core shaft (2) and the outer shell (1); The torque motor is arranged in the accommodating cavity, the motor mover (82) of the torque motor is fixed to the tail end of the core shaft (2), the orthographic projection of the motor mover (82) on the longitudinal section of the core shaft (2) is located at the tail end of the core shaft (2), and the motor stator (81) and the motor mover (82) of the torque motor are both arranged coaxially with the core shaft (2); Also included is a tail end protection assembly, the tail end protection assembly comprising a first protection member (6) located in the mounting hole (51) and a second protection member (7) fixedly assembled with the tail plate (5) so as to enclose the first protection member (6) in the mounting hole (51); The first protection member (6) comprises a protection disc body (61) fixedly connected to the core shaft and a central cylinder body (62) extending from the protection disc body (61); The second protective member (7) has a through hole (71) and an air-uniform groove (72) connected to the air pipe (79), and the central cylinder (62) is inserted into the through hole (71); A first airtight gap connected to the air-uniform groove (72) is formed between the second protective member (7) and the opposite side surfaces of the protective disc (61), and a second airtight gap connected to the first airtight gap is formed between the outer wall of the central cylinder (62) and the inner wall of the through hole (71), wherein the second airtight gap and the first airtight gap are not located in the same plane.

2. The motor-driven turntable according to claim 1, characterized in that: A first step portion (21) is provided near the head end of the core shaft (2), and a second step portion (22) is provided near the tail end of the core shaft (2). The bearing (3) is mounted on the first step portion (21), and a radial portion of the motor mover (82) is fixed on the second step portion (22).

3. The motor-driven turntable according to claim 1, characterized in that: The motor stator (81) is fixed on the tail plate (5), and the motor stator (81) is located on the outer peripheral side of the motor mover (82).

4. The motor-driven turntable according to claim 1, characterized in that: The outer wall of the central cylinder (62) and / or the inner wall of the through hole (71) are provided with a plurality of first annular grooves (621), and the groove wall of each first annular groove (621) from the groove bottom to the groove opening is arranged to be inclined toward the rear end of the central cylinder (62), so that an air curtain with a plurality of airflow vortices is formed when the airflow flows through the second airtight gap.

5. The motor-driven turntable according to claim 1, characterized in that: The tail end of the central cylinder (62) is provided with a sealing disk (63), the outer diameter of the sealing disk (63) being larger than the outer diameter of the central cylinder (62); the matching gap between the sealing disk (63) and the second protective member (7) forms a first labyrinth airtight structure located within the second airtight gap.

6. The motor-driven turntable according to claim 5, characterized in that: The first labyrinth airtight structure comprises: a second annular protrusion (631) provided on the sealing disk (63), a second annular groove (711) provided on the inner side wall of the through hole (71), the second annular protrusion (631) being inserted into the second annular groove (711) and the two being clearance-matched.

7. The motor-driven turntable according to claim 1, characterized in that: The second protective member (7) further comprises a third annular groove (73) located on the outer side of the gas-uniform groove (72), the third annular groove (73) being spaced apart from the gas-uniform groove (72); the first protective member (6) is provided with a third annular protrusion (64), the third annular protrusion (64) being inserted into the third annular groove (73), and a matching gap between the third annular groove and the third annular protrusion (64) forming a third airtight gap communicating with the gas-uniform groove.

8. The motor-driven turntable according to claim 7, characterized in that: A sealing member (91) is provided at the end of the third airtight gap relative to the gas homogenizing groove (72), and the sealing member (91) is located between the first protective member (6) and the second protective member (7).

9. The motor-driven turntable according to claim 8, characterized in that: The sealing member (91) is an oil seal; a fixing platform is provided on the second protective member (7), the oil seal is fixed on the fixing platform, and the oil seal abuts against the outer side wall of the first protective member (6).

10. The motor-driven turntable according to any one of claims 1 to 9, characterized in that: A first sealing ring (92) is provided between the first protective member (6) and the tail end of the core shaft (2), and a second sealing ring (93) is provided between the outer side wall of the second protective member (7) and the tail plate (5).

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