Heavy-load grinding electric spindle

Abstract

The utility model relates to the technical field of electric spindles, in particular to a heavy-load grinding electric spindle. The device comprises a shell, a rear bearing seat is fixed to the tail end of the shell through a bolt, an oil cylinder seat is fixed to the rear bearing seat through a bolt, and a front end cover is fixed to the front end of the shell through a bolt. A mandrel is movably installed in the shell and the rear bearing seat sequentially through a first double-row cylindrical roller bearing set, a bidirectional thrust angular contact ball bearing set and a second double-row cylindrical roller bearing set, a pull rod capable of moving front and back is installed in the mandrel, and a pull claw assembly for fixing a grinding cutter is arranged at the front end of the pull rod. The tail end of the pull rod extends out of the mandrel and then is fixedly provided with an unclamping ring through a bolt, and the front end of a piston in the oil cylinder base can make contact with the tail of the unclamping ring under hydraulic driving so as to push the pull rod to move forwards. According to the shafting configuration, the main shaft is high in rigidity, can bear very large radial and axial grinding force, can realize large-feed grinding, and is small in vibration and high in precision. And the surface quality and precision of ground parts are improved, and the grinding efficiency is high.

Description

TECHNICAL FIELD

[0001] The utility model relates to electric main shaft technical field especially heavy load grinding electric main shaft. BACKGROUND

[0002] Grinding is a very key process in the processing process, and the performance of the grinding electric main shaft determines the surface quality and grinding precision of the ground parts, and also determines the grinding efficiency, and the grinding parameters affect the service life and performance of the grinding electric main shaft, in order to improve the grinding efficiency and grinding quality, the performance of the grinding main shaft is very key, not only the grinding electric main shaft needs to have a larger grinding feed amount, but also the grinding main shaft needs to have a higher speed, and under the condition of higher speed operation, the main shaft also needs to have higher rigidity.

[0003] In view of the above defects, the designer actively researches and innovates to create a heavy load grinding electric main shaft, so that it has more industrial use value. INVENTION CONTENTS

[0004] To solve the above technical problems, the purpose of the utility model is to provide a heavy load grinding electric main shaft.

[0005] The heavy load grinding electric main shaft of the utility model, including the shell, the tail end of the shell is fixed with rear bearing seat through bolt, rear bearing seat is fixed with oil cylinder seat through bolt, the front end of the shell is fixed with front end cover through bolt, the core shaft is movably installed in the shell and rear bearing seat in turn through double row cylindrical roller bearing group one, bidirectional thrust angular contact ball bearing group and double row cylindrical roller bearing group two, the core shaft is provided with the pull rod that can move forward and backward, the pull rod is provided with the pull dog assembly that can fix the grinding cutter, the tail end of the pull rod is fixed with the tool knock ring that stretches out the core shaft through bolt, the front end of the piston in the oil cylinder seat can contact the tail part of the tool knock ring under the drive of the hydraulic pressure and be used for pushing the pull rod to move forward, the middle part of the core shaft is installed with motor rotor through interference fit, the inner side of the shell is installed with electronic stator of motor rotor.

[0006] The heavy load grinding motorized spindle adopts the combined configuration of double-row cylindrical roller bearing set one and bidirectional thrust angular contact ball bearing to bear the radial force and axial force in the grinding process, adopts double-row cylindrical roller bearing set two at the rear end to bear the radial force generated by the front end grinding, and the double-row short cylindrical roller bearing set can only bear the radial force and is the bearing capable of bearing the maximum radial force in the precision bearing, and the bidirectional thrust angular contact bearing can bear larger axial force than the precision ball bearing due to the larger contact angle, and the above-mentioned bearing configuration can realize that the spindle bears larger grinding force.

[0007] Further, the front end of the mandrel is outwardly folded, the inner side of the front spacer ring is attached, the double-row cylindrical roller bearing set one is attached to the inner side of the front spacer ring, the inner spacer ring is attached to the mandrel between the double-row cylindrical roller bearing set one and the bidirectional thrust angular contact ball bearing set, the outer spacer ring is attached to the inner wall of the shell, and the locking nut one is screwed on the mandrel outside the bidirectional thrust angular contact ball bearing set.

[0008] The front spacer ring, the inner spacer ring, the outer spacer ring and the outer spacer ring separate the double-row cylindrical roller bearing set one and the bidirectional thrust angular contact ball bearing set, so that the front end of the mandrel runs stably.

[0009] Further, the mandrel has a convex stepped surface structure, the front end of the rear spacer ring is in contact with the stepped surface, the rear bearing seat has an inwardly extending retainer ring, the one side end surface of the double-row cylindrical roller bearing set two is in contact with the tail end of the rear spacer ring and the retainer ring of the rear bearing seat, the outer side of the rear bearing seat is fixed with the rear bearing cover through bolts, the rear bearing cover is pressed on the outer ring of the double-row cylindrical roller bearing set two, the locking nut two is screwed into the mandrel, and the locking nut two is pressed on the inner ring of the double-row cylindrical roller bearing set two.

[0010] The two sides of the double-row cylindrical roller bearing set two arranged at the tail end of the mandrel are respectively equipped with the rear spacer ring, the rear bearing cover and the locking nut two, the double-row cylindrical roller bearing set two is limited, and stable support is provided for the tail end running of the mandrel.

[0011] Further, the pull claw assembly comprises a plurality of petal-shaped clamping claws, the outer two ends of the clamping claws are outwardly convex, the middle flat section of the clamping claws is attached to the convex structure on the inner side of the mandrel, the front end of the pull rod is provided with a limiting head through threads, the front end of the limiting head is outwardly convex, and the limiting head and the clamping claws have a gap for installing a tool.

[0012] The clamping claws on the pull claw assembly cooperate with the limiting head to fix and install the tool.

[0013] Further, the middle part of the pull rod and the mandrel have a disc spring placing groove, the disc spring is sleeved on the pull rod, one end of the disc spring is in contact with the stepped surface on the inner side of the mandrel, and the other end is in contact with the stepped surface at the tail end of the pull rod.

[0014] The disc spring is arranged between the pull rod and the mandrel, and provides power to the right of the pull rod to ensure stability of the tool after installation.

[0015] Further, the tail end of the mandrel is threadedly fitted with a pull rod gland, the tail end of the pull rod passes through the pull rod gland, and the opening of the tail end of the mandrel is smaller than the through hole on the pull rod gland.

[0016] The tail ends of the mandrel and the pull rod are positionally limited by the pull rod gland to limit the maximum moving distance of the pull rod.

[0017] By the above scheme, the heavy load grinding electric spindle has at least the following advantages: the heavy load grinding electric spindle adopts a combined configuration of a double-row cylindrical roller bearing set one and a bidirectional thrust angular contact ball bearing set, the double-row cylindrical roller bearing set one can bear a large radial force, the bidirectional thrust angular contact ball bearing set bears an axial force, and a double-row cylindrical roller bearing set two is arranged at the rear end. The shafting configuration has high rigidity of the spindle, can bear a very large grinding force in the radial and axial directions, can realize grinding with a large feed amount, has small vibration, and has high precision. The surface quality and precision of a ground part are improved, and the grinding efficiency is high.

[0018] The above description is only a summary of the technical scheme of the present application, in order to more clearly understand the technical means of the present application, and the content of the specification can be implemented, the following will be described in detail with the preferred embodiment of the present application and the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical scheme of the embodiment of the present application, the following will briefly introduce the drawings needed in the embodiment, it should be understood that the following drawings only show one embodiment of the present application, therefore should not be regarded as a limitation, for those skilled in the art, without creative labor, other related drawings can also be obtained from these drawings.

[0020] Figure 1 is a structural schematic diagram of the present application;

[0021] Figure 2 is a sectional view of the present application; Figure 1

[0022] Figure 3 is an enlarged schematic diagram of the A area in the present application; Figure 2

[0023] Figure 4 is an enlarged schematic diagram of the B area in the present application. Figure 2

[0024] ​​​Figure 1, the shell, 2, the rear bearing seat, 3, the oil cylinder seat, 4, the front end cover, 5, double row cylindrical roller bearing group one, 6, bidirectional thrust angular contact ball bearing group, 7, double row cylindrical roller bearing group two, 8, the mandrel, 9, the pull rod, 10, the tool ring, 11, the piston, 12, the motor rotor, 13, the electronic stator, 14, the front spacer, 15, the inner spacer, 16, the outer spacer, 17, the locking nut one, 18, the rear spacer, 19, the rear bearing cover, 20, the jaw, 21, the limit head, 22, the disc spring, 23, the disc spring, 24, the pull rod gland, 25, the locking nut two. DETAILED DESCRIPTION

[0025] The specific embodiments of the utility model are described in further detail below in combination with the drawings and examples. The following examples are used to illustrate the utility model, but not to limit the scope of the utility model.

[0026] Referring to Figure 1 and Figure 2 This heavy load grinding electric spindle, the shell 1, the rear bearing seat 2 and the oil cylinder seat 3 are external structures, the rear bearing seat 2 is fixed on the shell 1 by bolt, the oil cylinder seat 3 is fixed on the outer side of the rear bearing seat 2, the front end cover 4 is fixed on the front end of the shell 1, so that the device forms a cylindrical structure, a rotatable mandrel 8 is installed in the shell 1, the rear bearing seat 2 and the oil cylinder seat 3 through double row cylindrical roller bearing group one 5, bidirectional thrust angular contact ball bearing group 6 and double row cylindrical roller bearing group two 7, the pull rod 9 in the mandrel 8 can move forward and backward, the pull rod 9 cooperates with the jaw assembly to realize the rapid assembly of the grinding tool, the tool ring 10 at the tail end of the pull rod 9 cooperates with the piston 11 in the oil cylinder seat 3 for use, after the piston 11 contacts the tool ring 10, the pull rod 9 can be driven to move forward, facilitating the installation of the tool, the motor rotor 12 on the mandrel 8 and the motor stator 13 inside the shell 1 are used in cooperation, providing power for the rotation of the mandrel 8.

[0027] Referring to the drawings, the front end of the mandrel 8 is folded outward, the outer end of the front spacer 14 is attached to the end of the mandrel 8, the inner spacer 15 and the outer spacer 16 are used in cooperation between the double row cylindrical roller bearing group one 5 and the bidirectional thrust angular contact ball bearing group 6 at the front end, the double row cylindrical roller bearing group one 5 and the bidirectional thrust angular contact ball bearing group 6 are separated, the inner spacer 15 and the outer spacer 16 are respectively fitted on the mandrel 8 and the shell 1, and do not contact each other, and are respectively topped on the inner ring and the outer ring of the double row cylindrical roller bearing group one 5 and the bidirectional thrust angular contact ball bearing group 6, without affecting the operation of the double row cylindrical roller bearing group one 5 and the bidirectional thrust angular contact ball bearing group 6, at the same time, the outer side locking operation of the bidirectional thrust angular contact ball bearing group 6 is completed through the locking nut one 17 installed on the mandrel 8, so that the front end structure of the mandrel 8 is stable.

[0028] Referring to Figure 3The stepped surface of the mandrel 8 is provided with a rear spacer 18 between the double-row cylindrical roller bearing set two 7, the rear spacer 18 and the inner side stopper of the bearing seat 2 provide support for one side of the double-row cylindrical roller bearing set two 7, and the other side of the double-row cylindrical roller bearing set two 7 is fixed and limited by the contact locking nut two 25 and the rear bearing cover 19, so that the tail end structure of the mandrel 8 is stable.

[0029] Referring to Figure 4 The tail end of the claw 20 of the puller assembly is in contact with the push block fixed on the pull rod 9, the front end of the claw 20 is inclined, the upper end extends upward and has a hook-shaped structure, the middle part of the claw 20 is attached to the protrusion on the inner side of the mandrel 8, and external support is provided for the movement of the claw 20; when the tool is assembled, the limiting head 21 is first rotated outward, then the pull rod 9 is driven to move outward under the drive of the piston 11, at this time, the long end on the inner side of the limiting head 21 is inserted into the tool, the tool and the limiting head 21 are simultaneously limited and moved, the limiting head 21 is rotated until the tool is fixed, at this time, the outer wall of the tool is attached to the inner side of the claw 20, and the installation of the tool is completed.

[0030] The disc spring 23 arranged on the pull rod 9 provides a rightward force for the pull rod 9, the pull rod 9 is in a stable state, the tool at the end of the pull rod 9 is provided with a tension limiting function, and the tool is prevented from falling.

[0031] The pull rod pressing cover 24 at the tail end of the mandrel 8 provides limiting for the maximum movement of the tail end of the pull rod 9, the pull rod 9 can pass through the through hole of the pull rod pressing cover 24, the stepped surface at the tail end of the pull rod 9 is in contact with the inner side of the pull rod pressing cover 24, and the purpose of limiting the tail end of the pull rod 9 is achieved.

[0032] The working principle of the utility model is as follows:

[0033] The inner spacer ring 15 and the outer spacer ring 16 in the double-row cylindrical roller bearing set one 5 and the bidirectional thrust angular contact ball bearing set 6 jointly form the front end support of the mandrel 8, the front end bearing set is installed in the shell 1, the front spacer ring 14 is used for adjusting the position of the front end bearing set in the axial direction, the front end cover 4 is pressed on the outer ring of the double-row cylindrical roller bearing set one 5 of the front end bearing set, the locking nut one 17 is pressed on the inner ring of the double-row cylindrical roller bearing set one 5, the skeleton seal is installed in the front end cover 4, and the skeleton seal prevents dust and impurities such as grinding fluid from entering the interior of the main shaft, the sealing cover is fixed on the front end cover 4 through the set screw, and the sealing cover can further play a dustproof role. The motor stator 13 is matched with the shell 1, the motor rotor 12 is installed on the mandrel 8 in an interference fit, the double-row cylindrical roller bearing set two 7 at the rear end is installed in the rear bearing seat 3, the rear end has the rear spacer ring 18, the rear bearing cover 19 is pressed on the outer ring of the double-row cylindrical roller bearing set two 7, the locking nut two 25 is pressed on the inner ring of the double-row cylindrical roller bearing set two 7, the oil cylinder seat 3, the piston 11 and the oil cylinder cover form the main shaft tool breaking system, the broach system has the pull rod 9, the pull claw assembly and the disc spring assembly, and the tool breaking ring 10 is fixed at the rear end of the pull rod 9.

[0034] Finally, it should be pointed out that: first, in the description of the present application, it should be pointed out that, unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, which can be mechanical connection or electrical connection, or the communication between two elements, or direct connection, "up", "down", "left", "right" and the like are only used to indicate the relative positional relationship, when the absolute position of the described object changes, the relative positional relationship may change;

[0035] Secondly: the utility model discloses the embodiment of the drawings, only relate to the structure involved in the embodiment of the present disclosure, other structures can refer to the usual design, in the case where there is no conflict, the same embodiment and different embodiments of the utility model can be combined with each other.

[0036] Finally: the above-mentioned is only the preferred embodiment of the utility model, and is not used for limiting the utility model, it should be pointed out that, for ordinary skilled person in the art, on the premise of not departing from the technical principle of the present application, a plurality of improvements and modifications can be made, and these improvements and modifications should be regarded as the protection scope of the utility model.

Claims

1. A heavy duty grinding electrospindle comprising a housing (1), characterized in that: The rear end of the housing (1) is fixed with a rear bearing seat (2) by bolts. The rear bearing seat (2) is fixed with a cylinder seat (3) by bolts. The front end of the housing (1) is fixed with a front end cover (4) by bolts. Inside the housing (1) and the rear bearing seat (2), a spindle (8) is movably installed through a double-row cylindrical roller bearing assembly one (5), a double-direction thrust angular contact ball bearing assembly (6), and a double-row cylindrical roller bearing assembly two (7). A pull rod that can move back and forth is installed inside the spindle (8). 9) The front end of the pull rod (9) has a claw assembly for fixing the grinding tool. The tail end of the pull rod (9) extends out of the spindle (8) and is fixed with a tool-breaking ring (10) by bolts. The front end of the piston (11) in the cylinder seat (3) can contact the tail end of the tool-breaking ring (10) under hydraulic drive to push the pull rod (9) forward. The middle part of the spindle (8) is fitted with a motor rotor (12) by interference fit. The inner side of the housing (1) is fitted with an electronic stator (13) of the motor rotor (12).

2. A heavy duty grinding electrospindle according to claim 1, characterized in that: The front end of the spindle (8) is folded outward, and a front spacer (14) is attached to its inner side. The double-row cylindrical roller bearing assembly (5) is attached to the inside of the front spacer (14). There is an inner spacer (15) and an outer spacer (16) between the double-row cylindrical roller bearing assembly (5) and the double-direction thrust angular contact ball bearing assembly (6). The inner spacer (15) is attached to the spindle (8), and the outer spacer (16) is attached to the inner wall of the housing (1). There is a locking nut (17) screwed on the spindle (8) on the outside of the double-direction thrust angular contact ball bearing assembly (6).

3. A heavy duty grinding electrospindle according to claim 2, characterized in that: The spindle (8) has a raised stepped surface structure. The front end of the rear spacer (18) contacts the stepped surface. The rear bearing housing (2) has an inwardly extending retaining ring. One end face of the double-row cylindrical roller bearing assembly (7) contacts the tail end of the rear spacer (18) and the retaining ring of the rear bearing housing (2). The rear bearing housing (2) is fixed to the outside of the rear bearing cover (19) by bolts. The rear bearing cover (19) is pressed against the outer ring of the double-row cylindrical roller bearing assembly (7). The locking nut (25) is screwed into the spindle (8). The locking nut (25) is pressed against the inner ring of the double-row cylindrical roller bearing assembly (7).

4. A heavy duty grinding electrospindle according to claim 3, characterized in that: The puller assembly includes multiple petal-shaped jaws (20). The outer ends of the jaws (20) protrude outwards. The straight section in the middle of the jaws (20) fits against the protruding structure inside the spindle (8). The front end of the pull rod (9) is threaded with a limiting head (21). The front end of the limiting head (21) protrudes outwards. There is a gap between the limiting head (21) and the jaws (20) for installing the tool.

5. A heavy duty grinding electrospindle according to claim 4, characterized in that: There is a disc spring mounting groove (22) between the middle part of the pull rod (9) and the spindle (8). The disc spring (23) is sleeved on the pull rod (9). One end of the disc spring (23) contacts the stepped surface inside the spindle (8), and the other end contacts the stepped surface at the tail end of the pull rod (9).

6. A heavy duty grinding electrospindle according to claim 5, characterized in that: The tail end of the spindle (8) is fitted with a pull rod cover (24) by thread, and the tail end of the pull rod (9) passes through the pull rod cover (24). The opening at the tail end of the spindle (8) is smaller than the through hole on the pull rod cover (24).

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