Hydraulic locking and positioning workpiece structure for direct-drive rotary table and direct-drive rotary table

Abstract

The invention discloses a hydraulic locking and positioning workpiece structure for a direct-drive rotary table and the direct-drive rotary table, and the hydraulic locking and positioning workpiece structure comprises a transmission assembly arranged in a rotary table mandrel of the direct-drive rotary table; wherein a clamping oil way and a loosening oil way are arranged in the rotary table mandrel, the transmission assembly is communicated with the clamping oil way and the loosening oil way, and the clamping oil way and the loosening oil way are arranged on the two sides of the transmission assembly respectively; the clamp assembly is connected with the transmission assembly; when the hydraulic oil flows in from the clamping oil way, the hydraulic oil pushes the transmission assembly to move in the first direction so as to enable the clamp assembly to clamp a workpiece to be machined, and when the hydraulic oil flows in from the loosening oil way, the hydraulic oil pushes the transmission assembly to move in the second direction so as to enable the clamp assembly to loosen the workpiece to be machined. Wherein the first direction is opposite to the second direction. In this way, the workpiece clamping efficiency can be improved.

Description

Technical Field

[0001] This application relates to the field of mechanical equipment technology, and in particular to a hydraulic locking and positioning workpiece structure for a direct drive rotary table and a direct drive rotary table. Background Technology

[0002] A CNC rotary table is an important component of a machine tool with a rotatable worktable. It is used to clamp workpieces and achieve rotation and indexing positioning. Compared with ordinary worm gear or roller cam structure rotary tables, direct drive rotary tables have the advantages of high rotation speed, zero backlash, and high precision, and are widely used.

[0003] However, due to the imperfections in the current locking and positioning structure design of direct-drive rotary tables, workpiece installation on these tables is generally done manually, which is inefficient and detrimental to CNC machine tool machining. Therefore, improving workpiece clamping efficiency has become an urgent problem to be solved. Summary of the Invention

[0004] The main technical problem addressed by this application is to provide a hydraulic locking and positioning workpiece structure for a direct-drive rotary table and a direct-drive rotary table, which can improve the efficiency of workpiece clamping.

[0005] To solve the above-mentioned technical problems, the first aspect of this application provides a hydraulic locking and positioning workpiece structure for a direct-drive rotary table, comprising: a transmission assembly disposed inside the rotary table spindle included in the direct-drive rotary table; wherein the rotary table spindle is provided with a clamping oil passage and a releasing oil passage, the transmission assembly is connected to the clamping oil passage and the releasing oil passage, the clamping oil passage and the releasing oil passage are respectively disposed on both sides of the transmission assembly; and a clamping assembly connected to the transmission assembly; wherein, when hydraulic oil flows in from the clamping oil passage, the hydraulic oil pushes the transmission assembly to move in a first direction, so that the clamping assembly clamps the workpiece to be processed; when hydraulic oil flows in from the releasing oil passage, the hydraulic oil pushes the transmission assembly to move in a second direction, so that the clamping assembly releases the workpiece to be processed; wherein, the first direction is opposite to the second direction.

[0006] The rotary table spindle has a first through hole and a receiving portion communicating with the first through hole. The transmission assembly includes: a hydraulic cylinder rod disposed in the first through hole; one end of the hydraulic cylinder rod protruding from the direct drive rotary table; a hydraulic cylinder piston connected to the clamp assembly; a second through hole disposed on the hydraulic cylinder piston, and the other end of the hydraulic cylinder rod disposed in the second through hole; and an elastic element disposed in the receiving portion and sleeved on the side of the hydraulic cylinder rod near the hydraulic cylinder piston.

[0007] The hydraulic locking and positioning workpiece structure further includes: a shift fork rod; one end of the shift fork rod is connected to the cylinder piston, and the other end is connected to the clamping assembly; a proximity switch is disposed at one end of the cylinder pull rod protruding from the direct drive turntable.

[0008] The clamping assembly includes: a pull claw connected to the end of the shift fork rod away from the piston of the hydraulic cylinder; a pull claw positioning sleeve spaced apart from the piston of the hydraulic cylinder; and a positioning pin disposed on the end face of the pull claw positioning sleeve for positioning the workpiece to be processed.

[0009] The direct-drive turntable also includes a turntable housing disposed outside the turntable spindle, and the hydraulic locking and positioning workpiece structure further includes a torque motor, including a motor stator and a motor rotor; wherein the motor stator is installed inside the turntable housing, and the motor rotor is fixedly connected to the turntable spindle.

[0010] The hydraulic locking and positioning workpiece structure further includes: a rear end cover, which is fixedly connected to the motor stator and the turntable housing; and a rotor fixing ring; wherein the motor rotor is fixedly connected to the turntable spindle through the rotor fixing ring.

[0011] The hydraulic locking and positioning workpiece structure further includes: a circular grating fixed on the rear end cover; wherein the circular grating is provided with a third through hole; and a mandrel transition sleeve disposed in the third through hole.

[0012] The hydraulic locking and positioning workpiece structure further includes: a front bearing for the turntable; one end of the front bearing is connected to the turntable housing, and the other end is connected to the turntable spindle; and a rear bearing for the turntable is connected to the turntable spindle.

[0013] The hydraulic locking and positioning workpiece structure further includes: a front end cover fixed to the turntable housing; a first seal disposed between the front end cover and the front bearing of the turntable; and a second seal disposed between the front end cover and the turntable housing.

[0014] To solve the above-mentioned technical problems, the second aspect of this application provides a direct-drive rotary table, comprising: a rotary table spindle, internally provided with a clamping oil circuit and a releasing oil circuit; a rotary table housing, disposed outside the rotary table spindle; and the hydraulic locking and positioning workpiece structure described in the first aspect, disposed inside the rotary table housing and connected to the clamping oil circuit and the releasing oil circuit.

[0015] The beneficial effects of this application are as follows: Unlike the prior art, in the hydraulic locking and positioning workpiece structure proposed in this application, after the workpiece to be processed is placed on the direct drive turntable, when hydraulic oil flows in from the clamping oil circuit, the hydraulic oil will push the transmission component to move in the first direction, thereby causing the clamping component to clamp the workpiece to be processed. When hydraulic oil flows in from the releasing oil circuit, the hydraulic oil will push the transmission component to move in the second direction, thereby causing the clamping component to release the workpiece to be processed. By automatically clamping and releasing the workpiece hydraulically, there is no need to use screws for fastening, which facilitates automated production operations and improves the efficiency of clamping the workpiece. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them:

[0017] Figure 1 This is a cross-sectional structural schematic diagram of one embodiment of the hydraulic locking and positioning workpiece structure for direct drive rotary table of this application;

[0018] Figure 2 This is a cross-sectional structural schematic diagram of one embodiment of the turntable mandrel of this application;

[0019] Figure 3 This is a schematic diagram of one embodiment of the direct-drive rotary table of this application. Detailed Implementation

[0020] It should be noted that the terms "first" and "second" in this application are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or apparatuses.

[0021] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0022] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0023] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0024] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0025] This application provides the following embodiments, and each embodiment is described in detail below.

[0026] Please see Figure 1 and Figure 2 , Figure 1 This is a cross-sectional structural schematic diagram of one embodiment of the hydraulic locking and positioning workpiece structure for a direct-drive rotary table according to this application. Figure 2This is a cross-sectional structural diagram of one embodiment of the turntable mandrel of this application. The hydraulic locking and positioning workpiece structure 10 proposed in this application includes: a transmission assembly 100, disposed inside the turntable mandrel 11 included in the direct-drive turntable (not shown); wherein the turntable mandrel 11 is provided with a clamping oil passage 12 and a releasing oil passage 13, the transmission assembly 100 is connected to the clamping oil passage 12 and the releasing oil passage 13, and the clamping oil passage 12 and the releasing oil passage 13 are respectively disposed on both sides of the transmission assembly 100; and a clamping assembly connected to the transmission assembly 100; wherein, when hydraulic oil flows from the clamping oil passage... When hydraulic oil flows in from clamping oil passage 12, it pushes the transmission assembly 100 to move in the first direction a, so that the clamping assembly 101 clamps the workpiece to be processed. When hydraulic oil flows in from clamping oil passage 12, it pushes the transmission assembly 100 to move in the first direction a, so that the clamping assembly 101 clamps the workpiece to be processed. When hydraulic oil flows in from releasing oil passage 13, it pushes the transmission assembly 100 to move in the second direction b, so that the clamping assembly 101 releases the workpiece to be processed. The first direction a and the second direction b are opposite.

[0027] Specifically, the hydraulic locking and positioning workpiece structure 10 consists of multiple components, including a transmission assembly 100 and a clamping assembly 101. The transmission assembly 100 is located inside the turntable spindle 11 of the direct-drive turntable. The turntable spindle 11 has a clamping oil passage 12 and a releasing oil passage 13, which are respectively located on both sides of the transmission assembly 100. The transmission assembly 100 is connected to both the clamping oil passage 12 and the releasing oil passage 13. The clamping assembly 101 is connected to the transmission assembly 100. When hydraulic oil flows into the clamping oil passage 12, it pushes the transmission assembly 100 to move in the first direction a, thereby causing the clamping assembly 101 to clamp the workpiece to be processed. When hydraulic oil flows into the releasing oil passage 13, it pushes the transmission assembly 100 to move in the second direction b, thereby causing the clamping assembly 101 to release the workpiece to be processed. By automatically clamping and releasing the workpiece hydraulically, there is no need to use screws for fastening, which facilitates automated production operations and improves the efficiency of clamping the workpiece.

[0028] In some implementation scenarios, the transmission assembly 100 is provided with an oil inlet and an oil outlet for the clamping oil passage 12, and an oil inlet and an oil outlet for the loosening oil passage 13. The transmission assembly 100 is connected to the clamping oil passage 12 through the oil inlet and the oil outlet of the clamping oil passage 12, and is connected to the loosening oil passage 13 through the oil inlet and the oil outlet of the loosening oil passage 13. In addition, a sealing ring or a rotary oil seal or other sealing element is provided at each oil inlet and oil outlet to prevent oil leakage.

[0029] In some implementation scenarios, direct-drive rotary tables, lacking intermediate transmission links such as gears or belts, are directly driven by torque motors 104, which effectively eliminates problems such as friction and backlash, thereby improving machining accuracy.

[0030] In the hydraulic locking and positioning workpiece structure 10 proposed in this application, after the workpiece to be processed is placed on the direct drive turntable, when hydraulic oil flows in from the clamping oil passage 12, the hydraulic oil will push the transmission component 100 to move in the first direction a, thereby causing the clamping component 101 to clamp the workpiece to be processed. When hydraulic oil flows in from the releasing oil passage 13, the hydraulic oil will push the transmission component 100 to move in the second direction b, thereby causing the clamping component 101 to release the workpiece to be processed. By automatically clamping and releasing the workpiece hydraulically, there is no need to use screws for fastening, which facilitates automated production operations and improves the efficiency of clamping the workpiece.

[0031] Please continue reading. Figure 1 The turntable spindle 11 has a first through hole (not shown in the figure) and a receiving portion 15 connected to the first through hole. The transmission assembly 100 also includes a hydraulic cylinder rod 1000, a hydraulic cylinder piston 1001, and an elastic element 1002. The hydraulic cylinder rod 1000 is disposed in the first through hole, and one end of the hydraulic cylinder rod 1000 protrudes from the direct drive turntable. The hydraulic cylinder piston 1001 is connected to the clamp assembly 101, and a second through hole is provided on the hydraulic cylinder piston 1001. The other end of the hydraulic cylinder rod 1000 is disposed in the second through hole. The elastic element 1002 is disposed in the receiving portion 15 and sleeved on the side of the hydraulic cylinder rod 1000 near the hydraulic cylinder piston 1001.

[0032] Specifically, a first through hole is provided inside the turntable spindle 11, and the hydraulic cylinder rod 1000 is provided in the first through hole to facilitate the connection of the hydraulic cylinder rod 1000 to the hydraulic cylinder piston 1001. A second through hole is provided on the hydraulic cylinder piston 1001, and the other end of the hydraulic cylinder rod 1000 is provided in the second through hole.

[0033] In one implementation scenario, the cylinder rod 1000 has a threaded structure at one end inside the second through hole, and the inner wall of the second through hole is provided with a matching thread. The cylinder rod 1000 is tightened into the second through hole by the thread, so that the cylinder rod 1000 and the cylinder piston 1001 are fixed.

[0034] Furthermore, the turntable spindle 11 is also provided with a receiving part 15 that communicates with the first through hole, so that the elastic element 1002 can be inserted. The elastic element 1002 is sleeved on the side of the hydraulic cylinder rod 1000 near the hydraulic cylinder piston 1001 and is guided by the hydraulic cylinder rod 1000, mainly used to support the hydraulic cylinder piston 1001.

[0035] In one implementation scenario, the elastic element 1002 is a support compression spring.

[0036] In one implementation, please refer to... Figure 1The hydraulic locking and positioning workpiece structure 10 proposed in this application also includes a shift fork 102 and a proximity switch 103. One end of the shift fork 102 is connected to the cylinder piston 1001, and the other end is connected to the clamp assembly 101. The proximity switch 103 is located at one end of the cylinder pull rod 1000 that protrudes from the direct drive turntable.

[0037] Specifically, a shift fork 102 is provided on the hydraulic cylinder piston 1001. The shift fork 102 is designed to be tapered, with one end connected to the hydraulic cylinder piston 1001 and the other end connected to the clamping assembly 101. Since the movement of the hydraulic cylinder piston 1001 is usually axial linear motion, while the clamping assembly 101's motion requirements are often more complex, such as radial clamping, flipping, and swinging movements, the shift fork 102 can convert the axial thrust or pull of the hydraulic cylinder piston 1001 into a radial contraction force of the clamping assembly 101 when radially clamping the workpiece. When the clamping assembly 101 needs to flip around its axis, such as when flipping the workpiece to adjust its posture, the shift fork 102 can convert the linear motion of the hydraulic cylinder piston 1001 into the rotational motion of the clamping assembly 101, thus meeting multi-dimensional motion requirements.

[0038] In some implementation scenarios, the shift fork 102 is usually a one-piece rigid structure, such as a metal forging, without complex assembly, which can reduce failures caused by wear and loosening of parts. In addition, the shift fork 102 can directly transmit power, reduce losses, and ensure that hydraulic pressure can be efficiently converted into the mechanical energy of the clamping assembly 101, thereby improving clamping efficiency.

[0039] Furthermore, a proximity switch 103 is installed at one end of the hydraulic cylinder rod 1000 that protrudes from the direct drive turntable. The proximity switch 103 is used to detect the extension and retraction of the hydraulic cylinder rod 1000, thereby determining whether the clamping assembly 101 is properly clamping or releasing the workpiece to be processed. This can replace the traditional hydraulic pressure detection, and has high accuracy and good stability.

[0040] In some implementation scenarios, proximity switch 103 is a finger-type proximity switch.

[0041] In one implementation, please refer to... Figure 1 The fixture assembly 101 includes a pull claw 1010, a pull claw positioning sleeve 1011, and a positioning pin 1012. The pull claw 1010 is connected to the end of the shift fork 102 away from the hydraulic cylinder piston 1001. The pull claw positioning sleeve 1011 is spaced apart from the hydraulic cylinder piston 1001. The positioning pin 1012 is disposed on the end face of the pull claw positioning sleeve 1011 and is used to position the workpiece to be processed.

[0042] Specifically, the pull claw 1010 is used to clamp and release the workpiece to be processed. The pull claw positioning sleeve 1011 is spaced apart from the hydraulic cylinder piston 1001. A positioning pin 1012 is provided on the end face of the pull claw positioning sleeve 1011 to position the workpiece to be processed, ensuring the positioning of the workpiece to be processed. The positioning pin rotates together with the pull claw positioning sleeve 1011.

[0043] In some implementation scenarios, the number of workpiece positioning pins 1012 is 3, which are used to completely position the workpiece to be processed, thereby solving the problem of the traditional screw locking method.

[0044] In other implementation scenarios, the number of workpiece positioning pins 1012 can also be 2, 4 or 5, etc., and can be flexibly set according to the actual situation. This application does not impose specific restrictions here.

[0045] In one implementation scenario, the pull claw 1010 is a conical pull claw 1010. By adopting a conical fit, it is tight and without gaps, thereby improving the accuracy of clamping the workpiece.

[0046] In one implementation scenario, a bearing locking ring 112 is also provided on the outside of the claw positioning sleeve 1011, and a sealing ring (not shown in the figure) is provided between the bearing locking ring 112 and the claw positioning sleeve 1011, thereby further ensuring the sealing performance of the hydraulic locking positioning workpiece structure 10.

[0047] In a specific implementation scenario, when hydraulic oil enters from the clamping oil circuit 12, the hydraulic oil pushes the cylinder piston 1001 to move in the first direction a, thereby causing the pull claw 1010 to retract inward, thus completing the clamping action. The cylinder rod 1000 also moves in the first direction a. The extension of the cylinder rod 1000 is detected by the proximity switch 103 to determine whether the pull claw 1010 is properly clamped. Conversely, when hydraulic oil enters from the releasing oil circuit 13, the hydraulic oil pushes the cylinder piston 1001 to move in the second direction b, thereby causing the pull claw 1010 to expand outward, thus completing the releasing action. The cylinder rod 1000 also moves in the second direction b. The retraction of the cylinder rod 1000 is detected by the proximity switch 103 to determine whether the pull claw 1010 is properly released.

[0048] It should be noted that when there is no hydraulic pressure, the pull claw 1010 is in the released state.

[0049] In one implementation, please refer to... Figure 1 The direct-drive turntable also includes a turntable housing 14 disposed outside the turntable spindle 11. The hydraulic locking and positioning workpiece structure 10 proposed in this application also includes a torque motor 104, including a motor stator 1040 and a motor rotor 1041; wherein, the motor stator 1040 is installed inside the turntable housing 14, and the motor rotor 1041 is fixedly connected to the turntable spindle 11.

[0050] Specifically, the turntable housing 14 is made of high-quality castings. The stator 1040 of the torque motor 104 is installed inside the turntable housing 14, and the rotor 1041 of the torque motor 104 is fixedly connected to the turntable spindle 11 and rotates together with the turntable spindle 11.

[0051] In one implementation, please refer to... Figure 1 The hydraulic locking and positioning workpiece structure 10 proposed in this application also includes a rear end cover 105 and a rotor fixing ring 106. The rear end cover 105 is fixedly connected to the motor stator 1040 and the turntable housing 14, and the motor rotor 1041 is fixedly connected to the turntable spindle 11 through the rotor fixing ring 106.

[0052] Specifically, the motor stator 1040 of the torque electronic is fixedly connected to the turntable housing 14 through the rear end cover 105, which can directly transmit the reaction force generated by the motor during operation to the turntable housing 14, preventing the motor stator 1040 from being displaced or vibrating due to the reaction force, ensuring the stability of the magnetic field of the motor stator 1040, and providing a continuous and stable electromagnetic driving force for the motor rotor 1041. The motor rotor 1041 of the torque electronic is fixed on the turntable spindle 11 through the rotor fixing ring 106, which can directly transmit the torque generated by the torque motor 104 to the turntable spindle 11, reducing the force loss of the intermediate transmission links and improving the torque transmission efficiency.

[0053] In one implementation, please refer to... Figure 1 The hydraulic locking and positioning workpiece structure 10 proposed in this application also includes a circular grating 107 and a mandrel transition sleeve 108. The circular grating 107 is fixed on the rear end cover 105, and a third through hole (not shown in the figure) is provided on the circular grating 107. The mandrel transition sleeve 108 is disposed in the third through hole.

[0054] Specifically, the circular grating 107 is fixed on the rear end cover 105 to obtain the rotation angle of the direct drive turntable, and the circular grating 107 is provided with a third through hole, and the spindle transition sleeve 108 is disposed in the third through hole.

[0055] In one implementation scenario, a sliding bearing 113 is provided between the mandrel transition sleeve 108 and the cylinder rod 1000, which facilitates the extension and retraction of the cylinder rod 1000 while ensuring that the circular grating 107 and the cylinder rod 1000 maintain consistent precision.

[0056] In one implementation, please refer to... Figure 1The hydraulic locking and positioning workpiece structure 10 proposed in this application also includes a front turntable bearing 109 and a rear turntable bearing 110. One end of the front turntable bearing 109 is connected to the turntable housing 14, and the other end is connected to the turntable spindle 11. The rear turntable bearing 110 is connected to the turntable spindle 11.

[0057] Specifically, the front bearing 109 of the turntable is fixedly connected to the turntable housing 14 on one hand and to the front end of the turntable spindle 11 on the other hand, thereby supporting the turntable housing 14 and the turntable spindle 11. The rear end of the turntable spindle 11 is also provided with a rear bearing 110 to support the turntable spindle 11 and ensure the stable positioning of the turntable spindle 11.

[0058] In one embodiment, the hydraulic locking and positioning workpiece structure 10 proposed in this application further includes a front end cover 111, a first seal (not shown in the figure) and a second seal (not shown in the figure), wherein the front end cover 111 is fixed on the turntable housing 14, the first seal is disposed between the front end cover 111 and the turntable front bearing 109, and the second seal is disposed between the front end cover 111 and the turntable housing 14.

[0059] Specifically, oil leakage is prevented by providing a first seal between the front cover 111 and the front bearing 109 of the turntable, and a second seal between the front cover 111 and the turntable housing 14.

[0060] In some implementation scenarios, the first sealing element is a sealing ring and the second sealing element is a rotary oil seal. In other implementation scenarios, the first and second sealing elements can also be sealing rings or O-rings, etc., and can be flexibly set according to the actual situation. This application does not impose specific restrictions here.

[0061] It should be noted that the oil inlet and outlet of the cylinder piston are connected through intersecting holes on the rear end cover, the turntable spindle, and the pull claw positioning sleeve, respectively. Furthermore, seals are provided on the connecting surfaces of the intersecting holes on the rear end cover, the turntable spindle, and the pull claw positioning sleeve to prevent oil leakage.

[0062] Please see Figure 1 , Figure 2 and Figure 3 , Figure 3 This is a schematic diagram of a direct-drive rotary table according to an embodiment of the present application. The direct-drive rotary table 1 includes a rotary table spindle 11, a rotary table housing 14, and a hydraulic locking and positioning workpiece structure 10 as described in any of the above embodiments. The rotary table spindle 11 is provided with a clamping oil passage 12 and a releasing oil passage 13. The rotary table housing 14 is located outside the rotary table spindle 11. The hydraulic locking and positioning workpiece structure 10 is located inside the rotary table housing 14 and is connected to the clamping oil passage 12 and the releasing oil passage 13.

[0063] Specifically, the automatic hydraulic clamping of the workpiece to be processed is achieved through the clamping oil circuit 12, the releasing oil circuit 13 and the hydraulic locking and positioning workpiece structure 10 set inside the turntable spindle 11. No screw fastening is required, which facilitates automated production operations. In addition, the direct drive turntable 1 has a compact overall structure, occupies little space, and does not require the addition of other facilities, which can save space and cost.

[0064] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A hydraulic locking and positioning workpiece structure for a direct-drive rotary table, characterized in that, include: A transmission assembly is disposed inside the turntable spindle included in the direct drive turntable; wherein, the turntable spindle is provided with a clamping oil passage and a releasing oil passage, the transmission assembly is connected to the clamping oil passage and the releasing oil passage, and the clamping oil passage and the releasing oil passage are respectively disposed on both sides of the transmission assembly; The clamp assembly is connected to the transmission assembly; When hydraulic oil flows in from the clamping oil passage, the hydraulic oil pushes the transmission assembly to move in a first direction so that the clamping assembly clamps the workpiece to be processed. When hydraulic oil flows in from the releasing oil passage, the hydraulic oil pushes the transmission assembly to move in a second direction so that the clamping assembly releases the workpiece to be processed. The first direction is opposite to the second direction.

2. The hydraulic locking and positioning workpiece structure for a direct-drive rotary table according to claim 1, characterized in that, The turntable spindle has a first through hole and a receiving portion communicating with the first through hole. The transmission assembly includes: A hydraulic cylinder tie rod is disposed within the first through hole; wherein, one end of the hydraulic cylinder tie rod protrudes from the direct drive turntable; A hydraulic cylinder piston is connected to the clamping assembly; wherein, the hydraulic cylinder piston is provided with a second through hole, and the other end of the hydraulic cylinder rod is disposed in the second through hole; An elastic element is disposed within the receiving portion and sleeved on the side of the cylinder rod near the cylinder piston.

3. The hydraulic locking and positioning workpiece structure for a direct-drive rotary table according to claim 2, characterized in that, The hydraulic locking and positioning workpiece structure also includes: A shift fork lever; wherein one end of the shift fork lever is connected to the hydraulic cylinder piston, and the other end is connected to the clamping assembly; A proximity switch is located at one end of the hydraulic cylinder rod that protrudes from the direct drive turntable.

4. The hydraulic locking and positioning workpiece structure for a direct-drive rotary table according to claim 3, characterized in that, The clamp assembly includes: A pull claw is connected to the end of the shift fork rod away from the piston of the hydraulic cylinder. A pull claw positioning sleeve is spaced apart from the hydraulic cylinder piston; A positioning pin is provided on the end face of the pull claw positioning sleeve and is used to position the workpiece to be processed.

5. The hydraulic locking and positioning workpiece structure for a direct-drive rotary table according to claim 1, characterized in that, The direct-drive rotary table also includes a rotary table housing disposed outside the rotary table spindle, and the hydraulic locking and positioning workpiece structure further includes: A torque motor includes a motor stator and a motor rotor; wherein the motor stator is installed inside the turntable housing, and the motor rotor is fixedly connected to the turntable spindle.

6. The hydraulic locking and positioning workpiece structure for a direct-drive rotary table according to claim 5, characterized in that, The hydraulic locking and positioning workpiece structure also includes: The rear end cover is fixedly connected to the motor stator and the turntable housing; Rotor retaining ring; wherein the motor rotor is fixedly connected to the turntable spindle via the rotor retaining ring.

7. The hydraulic locking and positioning workpiece structure for a direct-drive rotary table according to claim 6, characterized in that, The hydraulic locking and positioning workpiece structure also includes: A circular grating is fixed on the rear end cover; wherein, the circular grating is provided with a third through hole; A mandrel transition sleeve is disposed in the third through hole.

8. The hydraulic locking and positioning workpiece structure for a direct-drive rotary table according to claim 5, characterized in that, The hydraulic locking and positioning workpiece structure also includes: A front bearing for the turntable; wherein one end of the front bearing is connected to the turntable housing and the other end is connected to the turntable spindle; The rear bearing of the turntable is connected to the turntable spindle.

9. The hydraulic locking and positioning workpiece structure for a direct-drive rotary table according to claim 8, characterized in that, The hydraulic locking and positioning workpiece structure also includes: The front end cover is fixed to the turntable housing; The first sealing element is disposed between the front end cover and the front bearing of the turntable; The second sealing element is disposed between the front end cover and the turntable housing.

10. A direct-drive rotary table, characterized in that, include: The rotary table spindle has internal clamping and releasing oil passages; A turntable housing is disposed outside the turntable spindle; The hydraulic locking and positioning workpiece structure according to any one of claims 1-9 is disposed inside the turntable housing and is connected to the clamping oil circuit and the releasing oil circuit.

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