Grinding carriage structure of grinding machine

Abstract

The utility model relates to a grinding carriage structure of a grinding machine, which comprises a base, a fixed mandrel, a reversing frame, a motor stator, a motor rotor, a locking oil cylinder, an encoder support and an encoder, the fixed mandrel is mounted on the base, and the reversing frame is supported on the outer side of the fixed mandrel through a first bearing and a second bearing; the motor rotor is mounted on the fixed mandrel, the motor stator is mounted on the reversing frame, and the motor stator and the motor rotor interact to drive the reversing frame to rotate; the locking oil cylinder is of an annular structure and is fixedly connected with the reversing frame, and a locking piston in the locking oil cylinder moves downwards to lock and fix the reversing frame; the encoder bracket is fixed on the reversing frame, is provided with an accommodating cavity and is positioned in a central hole of the locking oil cylinder; an encoder mandrel and an encoder are arranged in the containing cavity, the encoder mandrel is fixed on the fixed mandrel, and the encoder is respectively connected with the encoder mandrel and the encoder support. The clamp is high in rigidity, not prone to deformation, high in positioning precision and capable of effectively guaranteeing the machining precision and efficiency of a machine tool.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of grinding machine, especially relate to a grinding wheel frame structure of grinding machine. BACKGROUND

[0002] The grinding wheel frame is an important component of the grinding machine, and through installing various grinding spindles on the grinding wheel frame rotary body, different spindles can be switched for machining, and the grinding machine can be used for compound machining.

[0003] The rigidity and positioning accuracy of the grinding wheel frame are important factors affecting the machining accuracy of the grinding machine. In the existing grinding wheel frame structure, the positioning and locking are generally designed by integrating the oil cylinder with the grinding wheel frame rotary body. During the locking process of the oil cylinder, the hydraulic pressure directly acts on the grinding wheel frame rotary body, causing large deformation of the grinding wheel frame rotary body, affecting the position accuracy and rotation accuracy of the grinding spindle thereon, and further affecting the machining accuracy of the machine tool. In addition, in the existing grinding wheel frame structure, the angle encoder is usually directly connected with the oil cylinder. The deformation of the oil cylinder can easily cause the position of the angle encoder to change, affecting the accuracy of the angle encoder, and thus causing low positioning accuracy of the grinding wheel frame, and further affecting the machining accuracy and efficiency of the machine tool. SUMMARY

[0004] The utility model aims at overcoming the defects of the prior art, and provides a grinding wheel frame structure of a grinding machine, which has high rigidity, is not easy to deform, has high positioning accuracy, and effectively ensures the machining accuracy and efficiency of the machine tool.

[0005] To solve the above technical problems, the utility model is realized by the following technical scheme: a grinding wheel frame structure of a grinding machine, comprising a base, a fixed mandrel, a rotary frame, a first bearing, a second bearing, a motor stator, a motor rotor, a locking oil cylinder, an encoder support and an encoder. The fixed mandrel and the first bearing are both installed on the base, the second bearing is installed on the fixed mandrel, and the rotary frame is supported and installed on the outside of the fixed mandrel through the first bearing and the second bearing. The motor rotor and the motor stator are arranged inside and outside, the motor rotor is installed on the fixed mandrel, the motor stator is installed on the inner wall of the rotary frame, and the motor stator and the motor rotor interact to make the motor stator drive the rotary frame to rotate. The locking oil cylinder is annular in structure, is installed above the rotary frame, and is fixedly connected with the rotary frame. The locking oil cylinder is internally provided with a locking piston, and the locking piston can lock and fix the rotary frame by moving downward. The encoder support is fixed on the rotary frame and can rotate with the rotary frame. The encoder support is provided with a containing cavity, and the containing cavity is located in the center hole of the locking oil cylinder. The containing cavity is internally provided with an encoder mandrel and an encoder, the encoder mandrel is fixed on the fixed mandrel, and the encoder is connected with the encoder mandrel and the encoder support, respectively, so as to detect and feedback the rotation angle of the encoder support. The outside of the rotary frame is distributed in multiple surfaces, and each surface can be installed with a spindle.

[0006] The grinding wheel frame structure of the grinding machine, the first bearing is a rotary table bearing, and the second bearing is a roller bearing; the rotary frame is directly connected with the first bearing, a sealing ring is arranged between the rotary frame and the base to seal the first bearing; the rotary frame is connected with the second bearing through a bearing sleeve, the bearing sleeve is fixed on the locking oil cylinder and is sleeved on the second bearing and is connected with the outer ring of the second bearing.

[0007] The grinding wheel frame structure of the grinding machine, a pre-tightening device is arranged on the second bearing, including an outer ring pressing ring and an inner ring pre-tightening ring, the outer ring pressing ring is pressed on the outer ring of the second bearing and is installed on the bearing sleeve; the inner ring pre-tightening ring is installed on the fixed mandrel and pre-tightens the inner ring of the second bearing.

[0008] The grinding wheel frame structure of the grinding machine, the lower part of the locking piston and the upper part of the bearing sleeve are provided with friction plates, the brake pad is installed on the inner ring pre-tightening ring, and the locking piston is pushed downward to press the brake pad between the two friction plates.

[0009] The grinding wheel frame structure of the grinding machine, the encoder includes an encoder inner ring and an encoder outer ring, the encoder inner ring is installed on the fixed mandrel and is locked and fixed through a locking nut; the encoder outer ring is installed on the encoder support and rotates with the encoder support.

[0010] The grinding wheel frame structure of the grinding machine, the upper part of the encoder support is also provided with an encoder upper cover to seal the accommodating cavity.

[0011] The grinding wheel frame structure of the grinding machine, an oil receiving groove is arranged below the second bearing, and the oil receiving groove is installed on the fixed mandrel.

[0012] Compared with the prior art, the beneficial effects of the utility model are that: the utility model adopts an encoder isolation support structure, the encoder support is separated from the locking oil cylinder, the influence of deformation of the locking oil cylinder on the accuracy of the encoder can be effectively avoided, the detection accuracy of the encoder and the positioning accuracy and the repeat positioning accuracy of the rotary frame are ensured; meanwhile, the utility model adopts a closed locking oil cylinder structure, the bearing sleeve is connected with the locking oil cylinder to form a C-shaped structure, during braking, the hydraulic pressure always acts on the inside of the locking oil cylinder and does not directly act on the rotary frame, the influence of the hydraulic pressure on the deformation of the rotary frame can be effectively avoided, the structure accuracy and stability of the rotary frame are ensured, the position and the accuracy stability of the main shaft and other positions installed on the rotary frame are ensured, the machine tool obtains more stable machining accuracy; in addition, the rotary frame adopts a rotary table bearing and a roller bearing support structure, higher rotary frame support rigidity and high tilting torque can be obtained, assembly adjustment is convenient, and the efficiency is high. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is an external overall structure schematic view provided by the utility model embodiment.

[0014] Figure 2 is a first direction internal structure schematic view provided by the embodiment of the utility model.

[0015] Figure 3 is a second direction internal structure schematic view provided by the embodiment of the utility model.

[0016] Figure 4 is a locking coupling structure schematic view provided by the embodiment of the utility model.

[0017] Figure 5 is a detection support structure schematic view provided by the embodiment of the utility model. DETAILED DESCRIPTION

[0018] The utility model will be described in further detail below in combination with the drawings and specific embodiments. The following embodiments are used to illustrate the utility model, but cannot be used to limit the scope of the utility model.

[0019] In the description of the embodiment of the utility model, it needs to be explained that the orientation or position relationship indicated by the terms "center", "upper", "lower", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the embodiment of the utility model and simplifying the description, and therefore cannot be understood as a limitation on the embodiment of the utility model. The terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0020] In the description of the embodiment of the utility model, it needs to be explained that, unless otherwise explicitly specified and limited, the term "coupling" should be understood broadly, for example, it can be fixed coupling, or detachable coupling, or integral coupling; it can be direct coupling, or indirect coupling through intermediate medium. For ordinary skilled in the art, the specific meaning of the above-mentioned terms in the embodiment of the utility model can be understood according to the specific circumstances.

[0021] In the embodiment of the utility model, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact of the first and second features, or indirect contact of the first and second features through intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0022] In combination with Figures 1 to 3As shown in the utility model embodiment provides a kind of grinding head structure of grinding machine, including pedestal 1, rotary table bearing 3, rotary frame 6, motor stator 7, motor rotor 8, fixed mandrel 9, bearing sleeve 10, roller bearing 11, encoder support 13, encoder 15 and locking cylinder 18.

[0023] Fixed mandrel 9 is fixedly installed on pedestal 1, and forms center support structure with pedestal 1. Rotary frame 6 is externally in multi-faceted structure, for installing different main shafts. Rotary frame 6 is supported and installed on the outside of fixed mandrel 9 by rotary table bearing 3 and roller bearing 11, the inner ring of rotary table bearing 3 is matched with pedestal 1, and the outer ring is matched with rotary frame 6; the inner ring of roller bearing 11 is matched with fixed mandrel 9, and the outer ring is matched with bearing sleeve 10. Sealing ring 2 is arranged between rotary frame 6 and pedestal 1, and forms sealing for rotary table bearing 3; sealing ring 2 is fixed on pedestal 1. Locking cylinder 18 is arranged above rotary frame 6, is fixedly connected with rotary frame 6 on one hand, and is fixedly connected with bearing sleeve 10 on the other hand. Pre-tightening device is arranged on roller bearing 11, including outer circle pressing ring 12 and inner ring pre-tightening ring 22, outer circle pressing ring 12 is tightly pressed on the outer ring of roller bearing 11, and is installed on bearing sleeve 10; inner ring pre-tightening ring 22 is installed on fixed mandrel 9, and pre-tightens the inner ring of roller bearing 11. Oil receiving groove 23 is arranged below roller bearing 11, and oil receiving groove 23 is installed on fixed mandrel 9.

[0024] Motor rotor 8 is installed on fixed mandrel 9, motor stator 7 is installed on the inner wall of rotary frame 6, and the lower end is axially fixed by stator adapter ring 5 and stator fixing ring 4, and stator adapter ring 5 and stator fixing ring 4 are both installed on rotary frame 6. Motor stator 7 and motor rotor 8 interact to make motor stator 7 drive rotary frame 6 to rotate.

[0025] As shown in the utility model embodiment provides a kind of grinding head structure of grinding machine, Figure 4 Locking cylinder 18 is annular structure, and locking piston 19 is arranged in annular cavity. Friction plate 20 is arranged below locking piston 19 and above bearing sleeve 10, and friction plate 20 can rotate with bearing sleeve 10, locking cylinder 18 and rotary frame 6. Brake pad 21 is installed on inner ring pre-tightening ring 22, and brake pad 21 is fixed. Locking cylinder 18 is filled with hydraulic oil, and locking piston 19 can be pushed down under the action of oil pressure, and brake pad 21 is tightly pressed between two friction plates 20, and the friction generated by brake pad 21 makes rotary frame 6 stop rotating, so that rotary brake function is realized. At this time, oil pressure acts on locking cylinder 18 and bearing sleeve 10, and does not act on rotary frame 6, so that the deformation of rotary frame 6 is not caused, and the locking process does not generate excess load on rotary frame shaft system, so that the structure precision and stability of rotary frame are guaranteed.

[0026] Combining Figure 2 And Figure 5As shown, the encoder support 13 is fixed on the slewing frame 6 and can rotate with the slewing frame 6. The encoder support 13 is a "concave" structure, and a containing cavity 24 is arranged in the center of the encoder support 13, which is sunkly arranged in the center hole of the locking oil cylinder 18 and is gaply arranged with the locking oil cylinder 18. An encoder upper cover 14 is mounted above the encoder support 13 to form internal sealing of the containing cavity 24. An encoder shaft 17 and an encoder 15 are arranged in the containing cavity 24, the encoder shaft 17 is fixed on the fixed shaft 9, the inner ring of the encoder 15 is mounted on the fixed shaft 9 and is locked and fixed through the locking nut 16, the outer ring of the encoder 15 is mounted on the encoder support 13 and rotates with the encoder support 13, the outer ring and the inner ring of the encoder 15 relatively rotate to realize rotation angle detection, so as to detect and feedback the rotation angle of the encoder support 13 and the slewing frame 6.

[0027] Although the utility model has been described in detail above, the utility model is not limited to this, and those skilled in the art can make various modifications according to the principle of the utility model. Therefore, any modification made according to the principle of the utility model should be understood as falling within the protection scope of the utility model.

Claims

1. A structure of a grinding wheel head of a grinding machine, characterized by comprising: The utility model provides a rotary table, including base, fixed mandrel, swivel frame, first bearing, second bearing, motor stator, motor rotor, locking oil cylinder, encoder support and encoder, fixed mandrel and first bearing all install on the base, second bearing installs on fixed mandrel, and swivel frame is supported and is installed on the outside of fixed mandrel through first bearing and second bearing, motor rotor and motor stator are arranged inside and outside, motor rotor installs on fixed mandrel, and motor stator installs on the inner wall of swivel frame, and motor stator and motor rotor can make motor stator drive swivel frame to rotate by interaction, locking oil cylinder is annular structure, installs on the top of swivel frame, and is fixedly connected with swivel frame, locking oil cylinder is provided with locking piston inside, and locking piston can lock and fix swivel frame by moving down, and encoder support is fixed on swivel frame and can rotate with swivel frame, and the accommodating cavity is set up on the encoder support, and the accommodating cavity is located in the center hole of locking oil cylinder, and encoder mandrel and encoder are provided in the accommodating cavity, and encoder mandrel is fixed on fixed mandrel, and encoder is coupled with encoder mandrel and encoder support respectively, and can detect and feedback the rotation angle of encoder support, and the outside of swivel frame is distributed in multiple surfaces, and each surface can install main shaft.

2. A wheel head structure of a grinding machine according to claim 1, wherein The first bearing is a rotary table bearing, and the second bearing is a roller bearing; the swivel frame is directly coupled with the first bearing, and a sealing ring is arranged between the swivel frame and the base to seal the first bearing; the swivel frame is coupled with the second bearing through a bearing sleeve, the bearing sleeve is fixed on the locking oil cylinder and is sleeved on the second bearing and coupled with the outer ring of the second bearing.

3. A wheel head structure of a grinding machine according to claim 2, wherein The second bearing is provided with a pre-tightening device, including an outer circular pressing ring and an inner ring pre-tightening ring, the outer circular pressing ring is pressed against the outer ring of the second bearing and is installed on the bearing sleeve; the inner ring pre-tightening ring is installed on the fixed mandrel to pre-tighten the inner ring of the second bearing.

4. A wheel head structure of a grinding machine according to claim 3, wherein The lower part of the locking piston and the upper part of the bearing sleeve are provided with friction plates, and a brake pad is installed on the inner ring pre-tightening ring, and the brake pad is pressed between the two friction plates when the locking piston is pushed down.

5. A wheel head structure for a grinding machine according to claim 4, wherein An oil receiving groove is arranged below the second bearing and is installed on the fixed mandrel.

6. A wheel head structure for a grinding machine according to any one of claims 1 to 5, wherein The encoder includes an encoder inner ring and an encoder outer ring, the encoder inner ring is installed on the fixed mandrel and is locked and fixed through a locking nut; the encoder outer ring is installed on the encoder support and rotates with the encoder support.

7. A wheel head structure of a grinding machine according to claim 6, wherein An encoder upper cover is installed on the upper part of the encoder support to seal the accommodating cavity.

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