Electric spindle bearing load preloading device

Abstract

The utility model discloses an electric spindle bearing load preloading device, and relates to the field of electric spindle installation auxiliary equipment. The device comprises a main shaft positioning mechanism which is used for being in positioning connection with the end part of the electric main shaft; the main shaft nut pre-tightening mechanism is provided with an operation end detachably connected with a main shaft nut, the operation end and the electric main shaft are coaxially arranged, the operation end is slidably arranged on the outer edge of the main shaft positioning mechanism in a sleeving mode, a driving part of the operation end is provided with a torque wrench, and the torque wrench is used for driving the operation end to rotate along the axis; the problem that precision is difficult to achieve when an existing motorized spindle is pre-tightened is solved.

Description

Technical Field

[0001] The utility model relates to the field of auxiliary equipment for installing an electric spindle, and specifically, to a device for preloading the bearing load of an electric spindle. Background Art

[0002] The electric spindle is a new technology in the field of high-precision CNC machine tools. It is an organic combination of a motor and a spindle. Especially when imported high-speed and ultra-precision electric spindles are introduced into our high-end engine manufacturing equipment; the maintenance of imported electric spindles has become one of our important tasks. Preloading (pre-tightening force) is one of the important factors determining the performance of imported electric spindle bearings. The magnitude of the pre-tightening force of imported electric spindle bearings directly affects their rotational accuracy, stiffness, noise, and service life.

[0003] For the traditional method of setting the pre-tightening force of imported electric spindle bearings, an ordinary hook wrench and a punch are used to strike the locking nut of the imported electric spindle. The setting, adjustment, and detection of the pre-tightening force entirely depend on the experience, feel, and perception of the master. For the setting, adjustment, measurement, and detection of the preloading (pre-tightening force) of imported electric spindles, it is very difficult to achieve digitization, precision, and convenience. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a device for preloading the bearing load of an electric spindle to solve the problem that it is difficult to achieve precision when pre-tightening an existing electric spindle.

[0005] To solve the above problems, the utility model adopts the following technical means:

[0006] A device for preloading the bearing load of an electric spindle includes:

[0007] A spindle positioning mechanism for positioning and connecting with the end of the electric spindle;

[0008] A spindle nut pre-tightening mechanism is constructed with an operating end detachably connected to the spindle nut. The operating end is coaxially arranged with the electric spindle and is slidably sleeved on the outer edge of the spindle positioning mechanism. A torque wrench is constructed on the driving part of the operating end, and the torque wrench is used to drive the operating end to rotate along the axis.

[0009] Preferably, the spindle positioning mechanism includes a positioning shaft coaxially arranged with the electric spindle. One end of the positioning shaft is key-connected to the end of the electric spindle. A first handle is threadedly installed on the side wall of the other end of the positioning shaft. The axis of the first handle is perpendicular to the axis of the positioning shaft, and the operating end is coaxially sleeved on the outer wall of the positioning shaft.

[0010] Furthermore, the spindle positioning mechanism further includes a pull rod. The electric spindle is hollow along the axis and penetrates through both ends. The pull rod extends along the axis of the electric spindle, and one end of the pull rod is coaxially threadedly connected to the end face of the positioning shaft.

[0011] Furthermore, one end of the pull rod opposite to the positioning shaft is arranged outside the motorized spindle, and a flange nut is installed. The flange nut abuts against one end of the motorized spindle opposite to the positioning shaft.

[0012] Furthermore, the spindle nut pre-tightening mechanism includes a turntable as the working end. A transition head is threadedly installed on the side wall of the turntable. A ribbed groove is formed on the surface of the transition head facing away from the motorized spindle. The transition head is limitedly connected to the torque wrench through the ribbed groove.

[0013] Furthermore, one end of the turntable facing the spindle nut is detachably connected to the spindle nut through positioning bolts, and at least a pair of positioning bolts are arranged diagonally.

[0014] Furthermore, a stepped groove is arranged on the side surface of the turntable, and the screw holes for installing the positioning bolts penetrate through the top surface of the stepped groove.

[0015] Furthermore, the working end is threadedly connected to the spindle positioning mechanism coaxially.

[0016] During the use of the present utility model, the following beneficial effects are achieved:

[0017] When preloading the motorized spindle bearing, the applied torque can be adjusted by a torque wrench, so as to realize the digitization, precision, refinement, convenience of the assembly and adjustment work, improve the assembly quality, effectively extend the service life of the motorized spindle, and more importantly, provide data accumulation for the maintenance of the motorized spindle, making the maintenance of the motorized spindle more reliable, stable and economical. Description of the Drawings

[0018] Figure 1 It is a schematic structural diagram of the present utility model.

[0019] Figure 2 It is a schematic structural diagram of the present utility model installed on the motorized spindle.

[0020] Wherein, 100 - spindle positioning mechanism, 101 - positioning shaft, 102 - first handle, 103 - pull rod, 200 - spindle nut pre-tightening mechanism, 201 - turntable, 202 - transition head, 300 - torque wrench, 400 - motorized spindle, 500 - spindle nut, 600 - positioning bolt. Detailed Embodiment

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of the embodiments. The components of the embodiments of the present utility model usually described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the claimed present utility model, but merely represents selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts fall within the scope of protection of the present utility model.

[0023] It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other.

[0024] It should be noted that like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0025] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship when the product of this utility model is normally placed, or the orientation or positional relationship commonly understood by those skilled in the art. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive distinction and cannot be understood as indicating or implying relative importance.

[0026] In the description of the present utility model, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "installed", "connected", "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0027] Please refer to Figure 1 andFigure 2 As shown, an electric spindle bearing load preloading device includes:

[0028] A spindle positioning mechanism 100 for positioning and connecting with the end of the electric spindle 400;

[0029] A spindle nut pre-tightening mechanism 200 is constructed with an operating end detachably connected to the spindle nut 500. The operating end is coaxially arranged with the electric spindle 400 and slidably sleeved on the outer edge of the spindle positioning mechanism 100. A torque wrench 300 is constructed on the driving part of the operating end, and the torque wrench 300 is used to drive the operating end to rotate along the axis.

[0030] Among them, the spindle positioning mechanism 100 can ensure that the spindle nut pre-tightening mechanism 200 and the electric spindle 400 always maintain a coaxial state. In this way, when using the torque wrench 300 to make the operating end drive the spindle nut 500 to rotate and pre-tighten, the spindle nut 500 can be prevented from skewing.

[0031] For the detachable connection between the operating end and the spindle nut 500, after the operating end is installed and positioned with the spindle nut 500, the rotation of the operating end is used to apply a pre-tightening force to the spindle nut 500, and the torque wrench 300 is used to adjust the value of the applied pre-tightening force.

[0032] Specifically, for the spindle positioning mechanism 100, the spindle positioning mechanism 100 includes a positioning shaft 101 coaxially arranged with the electric spindle 400. One end of the positioning shaft 101 is key-connected to the end of the electric spindle 400, and a first handle 102 is threadedly installed on the side wall of the other end of the positioning shaft 101. The axis of the first handle 102 is perpendicular to the axis of the positioning shaft 101, and the operating end is coaxially sleeved on the outer wall of the positioning shaft 101.

[0033] The first handle 102 here is used for an operator to hold and position the positioning shaft 101, so as to avoid the rotation of the electric spindle 400 when pre-tightening the spindle nut 500 by using the key connection between the positioning shaft 101 and the electric spindle 400, which affects the application of the pre-tightening force.

[0034] Furthermore, the spindle positioning mechanism 100 further includes a pull rod 103. The electric spindle 400 is hollow along the axis and penetrates through both ends. The pull rod 103 extends along the axis of the electric spindle 400, and one end of the pull rod 103 is coaxially threadedly connected to the end face of the positioning shaft 101.

[0035] In this way, after the pull rod 103 passes through the main shaft and is coaxially fixed with the positioning shaft 101, it can effectively avoid the situation that the axis of the positioning shaft 101 deviates from the axis of the motorized spindle 400 due to the pressing of the first handle 102 after the positioning shaft 101 is bonded to the motorized spindle 400. This improves the stability during the preloading process.

[0036] In order to avoid the axial separation between the positioning shaft 101 and the motorized spindle 400 during the preloading process, the end of the pull rod 103 opposite to the positioning shaft 101 is arranged outside the motorized spindle 400 and is equipped with a flange nut, and the flange nut abuts against the end of the motorized spindle 400 opposite to the positioning shaft 101.

[0037] In this way, after the pull rod 103 is threadedly connected to the positioning shaft 101, the abutment of the flange nut against the outer wall of the motorized spindle 400 can effectively prevent the positioning shaft 101 from separating from the motorized spindle 400 along the axial direction.

[0038] Furthermore, for the spindle nut preloading mechanism 200, the spindle nut preloading mechanism 200 includes a turntable 201 as the working end. A transition head 202 is threadedly installed on the side wall of the turntable 201. A ribbed groove is formed on the side of the transition head 202 facing away from the motorized spindle 400, and the transition head 202 is limitedly connected to the torque wrench 300 through the ribbed groove.

[0039] Moreover, the end of the turntable 201 facing the spindle nut 500 is detachably connected to the spindle nut 500 through positioning bolts 600, and at least a pair of positioning bolts 600 are arranged diagonally.

[0040] Furthermore, to facilitate the installation of the positioning bolts 600, a stepped groove is provided on the side surface of the turntable 201, and the screw holes for installing the positioning bolts 600 penetrate through the top surface of the stepped groove.

[0041] Here, in order to prevent the spindle positioning mechanism 100 and the spindle nut preloading mechanism 200 from separating during storage and handling, the working end is coaxially threadedly connected to the spindle positioning mechanism 100. Specifically, external threads are provided on the outer wall of the positioning shaft 101, internal threads are provided on the inner wall of the turntable 201, and the turntable 201 is threadedly connected to the positioning shaft 101, thereby realizing the connection between the spindle positioning mechanism 100 and the spindle nut preloading mechanism 200.

[0042] Usage method of this application: Horizontally place this utility model on the operation platform, and horizontally suspend the pre-assembled (the electric spindle 400 without the final value of the preload of the bearings of the electric spindle 400) electric spindle 400 on the platform, and pad the head and tail ends of the electric spindle 400 with solid V-shaped nylon pads. Sequentially insert the positioning bolts 600 into the screw holes on the side step grooves of the turntable 201, and at least one pair of the foregoing positioning bolts 600 are installed diagonally. Keep the positioning bolts 600 on the turntable 201 on the same side as the driving key of the positioning shaft 101, and then screw the turntable 201 onto the positioning shaft 101 in place with an external force. The positioning shaft 101 is key-connected to the end of the electric spindle 400, and the positioning bolt 600 is thread-connected to the screw hole on the end face of the electric spindle 400. Insert the pull rod 103 from the tail end of the electric spindle 400, pass through the center of the electric spindle 400, and screw it into the screw hole at the end of the positioning shaft 101; use an open-end wrench to tighten the pull rod 103 in place, and make the flange nut abut against the end face of the electric spindle 400. Set the torque value of the torque wrench 300 according to the technical parameters and operating conditions of the electric spindle 400. Insert the square head of the torque wrench 300 into the rib groove of the transition head 202 in place; insert the shaft head end of the first handle 102 into the corresponding screw hole of the positioning shaft 101, operate the torque wrench 300, and stabilize the first handle 102, so as to give and adjust the preload value of the bearings of the electric spindle 400.

[0043] Although the present utility model has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. An electric spindle bearing load preloading device, characterized in that, Comprising: A spindle positioning mechanism (100) for positioning and connecting with the end of the motorized spindle (400); A spindle nut pre-tightening mechanism (200) having an operating end detachably connected to the spindle nut (500), the operating end being coaxially arranged with the motorized spindle (400) and slidably sleeved on the outer edge of the spindle positioning mechanism (100), a torque wrench (300) being constructed on the driving part of the operating end, and the torque wrench (300) being used to drive the operating end to rotate along the axis.

2. The electric spindle bearing load preloading device according to claim 1, characterized in that, The spindle positioning mechanism (100) includes a positioning shaft (101) coaxially arranged with the motorized spindle (400), one end of the positioning shaft (101) being key-connected to the end of the motorized spindle (400), a first handle (102) being threadedly installed on the side wall of the other end of the positioning shaft (101), the axis of the first handle (102) being perpendicular to the axis of the positioning shaft (101), and the operating end being coaxially sleeved on the outer wall of the positioning shaft (101).

3. The preloading device for the electric spindle bearing load according to claim 2, wherein The spindle positioning mechanism (100) further includes a pull rod (103). The motorized spindle (400) is hollow along the axis and penetrates through both ends. The pull rod (103) extends along the axis of the motorized spindle (400), and one end of the pull rod (103) is coaxially threadedly connected to the end face of the positioning shaft (101).

4. The electric spindle bearing load preloading device according to claim 3, characterized in that, The end of the pull rod (103) opposite to the positioning shaft (101) is arranged outside the motorized spindle (400) and is provided with a flange nut (105), and the flange nut (105) abuts against the end of the motorized spindle (400) opposite to the positioning shaft (101).

5. A preloading device for the bearing load of an electric spindle according to claim 1, characterized in that, The spindle nut pre-tightening mechanism (200) includes a turntable (201) serving as the operating end. A transition head (202) is threadedly installed on the side wall of the turntable (201). A ribbed groove is constructed on the side of the transition head (202) facing away from the motorized spindle (400), and the transition head (202) is limitedly connected to the torque wrench (300) through the ribbed groove.

6. The electric spindle bearing load preloading device according to claim 5, wherein One end of the turntable (201) facing the spindle nut (500) is detachably connected to the spindle nut (500) through positioning bolts (600), and at least a pair of the positioning bolts (600) are arranged diagonally.

7. An electric spindle bearing load preloading device according to claim 6, characterized in that A stepped groove is provided on the side surface of the turntable (201), and the screw holes for installing the positioning bolts (600) penetrate through from the top surface of the stepped groove.

8. An electric spindle bearing load preloading device according to any one of claims 1 to 7, characterized in that, The operating end is coaxially threadedly connected to the spindle positioning mechanism (100).

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