Clamping device and machine tool

Abstract

The utility model relates to the technical field of workpiece clamping, and provides a clamping device and a machine tool, and the clamping device comprises a driving motor, an electric pull rod input shaft, a lead screw and a lead screw nut. Wherein the driving motor is provided with a motor output shaft; the first end of the electric pull rod input shaft is rigidly and directly connected with the motor output shaft; the first end of the lead screw is directly connected with the second end of the electric pull rod input shaft; the lead screw nut is in threaded transmission connection with the second end of the lead screw. The pull rod is connected to the lead screw nut. According to the clamping device provided by the utility model, the input shaft of the electric pull rod is rigidly and directly connected with the output shaft of the motor, and the lead screw is directly connected with the input shaft of the electric pull rod, so that the driving force of the driving motor can be transmitted to the lead screw without arranging a speed reducer, the driving force can be prevented from being amplified by the speed reducer, and the clamping force of the clamping device is further reduced; and the application range of the device is wider, thin-wall workpieces or elastic workpieces and other workpieces with small bearing force can be clamped, and the thin-wall workpieces or the elastic workpieces and other workpieces cannot be damaged.

Description

Technical Field

[0001] This utility model relates to the field of workpiece clamping technology, specifically to a clamping device and a machine tool. Background Technology

[0002] When machining workpieces, they typically need to be clamped. Generally, the workpiece is fixed to the machine tool by a chuck and rotates at high speed driven by a motor. The cutting tool is controlled to carve on the workpiece surface, thus completing the machining process. The chuck is a mechanical device on a machine tool used to clamp the workpiece. It utilizes the radial movement of movable jaws distributed on the chuck body to clamp and position the workpiece. A chuck generally consists of three parts: the chuck body, the movable jaws, and the jaw drive motor assembly.

[0003] In a direct-drive servo clamping system, a drive motor is typically used to drive a lead screw through a reducer, allowing the drawbar on the machine tool spindle to move along its own axial direction to clamp the workpiece.

[0004] However, in related workpiece clamping technologies, the clamping force of the clamping system is too large, the scope of application is limited, and it is difficult to clamp thin-walled or elastic workpieces with low load-bearing capacity. Utility Model Content

[0005] In view of the above-mentioned defects in the prior art, the present invention provides a clamping device to solve at least one of the above-mentioned technical defects in the prior art, so that the clamping force of the device is no longer too large, the application range is wider, and it can clamp thin-walled or elastic workpieces with low load-bearing capacity.

[0006] The second aspect of this utility model provides a machine tool.

[0007] To achieve the objective of this utility model, a clamping device is provided, comprising:

[0008] The drive motor is equipped with a motor output shaft;

[0009] An electric pull rod input shaft, the first end of which is rigidly directly connected to the motor output shaft;

[0010] A lead screw, the first end of which is directly connected to the second end of the input shaft of the electric pull rod;

[0011] A lead screw nut is threadedly connected to the second end of the lead screw, and the pull rod is connected to the lead screw nut.

[0012] Preferably, the clamping device has a main housing, which forms an accommodating space, and the electric pull rod input shaft is rotatably disposed in the accommodating space along its own central axis.

[0013] The clamping device also includes a rigid coupling, and the first end of the electric pull rod input shaft is directly connected to the motor output shaft through the rigid coupling.

[0014] Preferably, it also includes a connecting key, wherein the first end of the lead screw is directly connected to the second end of the electric pull rod input shaft via the connecting key.

[0015] Preferably, the lead of the threaded connection between the lead screw and the lead screw nut is 5mm, 8mm, or 10mm.

[0016] Preferably, it also includes an electromagnetic clutch, which is disposed in the accommodating space and matched with the electric pull rod input shaft.

[0017] Preferably, the drive motor also includes an encoder, which is disposed on the drive motor and is adapted to monitor the number of rotations and torque of the drive motor.

[0018] Preferably, the clamping device is further provided with a bearing, the bearing is disposed in the accommodating space, and the lead screw is connected to the bearing.

[0019] Preferably, the load-bearing bearing is a double-direction thrust ball bearing.

[0020] A second aspect of this utility model provides a machine tool, including the aforementioned clamping device and machine tool body.

[0021] The clamping device is located on the machine tool body.

[0022] Preferably, the machine tool further includes a tie rod and a machine tool spindle.

[0023] The pull rod passes through the machine tool spindle, and the clamping device is connected to the pull rod.

[0024] The beneficial effects of this utility model are as follows: The clamping device provided by this utility model directly connects the first end of the electric pull rod input shaft to the motor output shaft and directly connects the first end of the lead screw to the second end of the electric pull rod input shaft. This eliminates the need for a speed reducer to transmit the driving force (i.e., torque) of the drive motor to the lead screw. Moreover, it avoids the speed reducer from amplifying the driving force, thereby reducing the clamping force of the clamping device. This makes the device more widely applicable and can clamp thin-walled or elastic workpieces with low load-bearing capacity without causing damage to them.

[0025] The machine tool provided by this utility model, by including the aforementioned clamping device, inevitably possesses all the advantages of that device. That is, the machine tool can transmit the driving force (i.e., torque) of the drive motor to the lead screw without the need for a speed reducer, and it avoids amplifying the driving force through the speed reducer, thereby reducing the clamping force of the clamping device. This broadens the device's applicability, allowing it to clamp thin-walled or elastic workpieces with low load-bearing capacity without causing damage to them. Attached Figure Description

[0026] The above and other objects, features, and advantages of this utility model will become clearer through a more detailed description of the preferred embodiments shown in the accompanying drawings. The same reference numerals indicate the same parts throughout the drawings, and the drawings are not intentionally drawn to scale with actual dimensions; the focus is on illustrating the gist of this application.

[0027] Figure 1 A schematic diagram of the overall structure of the clamping device provided in this embodiment of the utility model;

[0028] Figure 2 A schematic diagram of the clamping device installed on the machine tool spindle is provided for an embodiment of this utility model.

[0029] In the picture:

[0030] 1. Machine tool spindle; 2. Tie rod;

[0031] 100. Drive motor; 110. Motor output shaft;

[0032] 200. Electric pull rod input shaft; 210. Rigid coupling;

[0033] 300. Lead screw; 310. Connecting key;

[0034] 400. Screw nut;

[0035] 500. Main casing; 510. Accommodation space;

[0036] 600. Electromagnetic clutch;

[0037] 700, Encoder;

[0038] 800. Load-bearing bearing. Detailed Implementation

[0039] To facilitate understanding of this utility model, a more comprehensive description of this utility model will be given below with reference to the accompanying drawings.

[0040] It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to and integrated with the other component, or there may be an intervening component present. The terms "mounted," "one end," "the other end," and similar expressions used in this document are for illustrative purposes only.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this applies. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0042] The following is combined with Figures 1 to 2 The embodiments of this utility model will be described below. It should be understood that the following description is merely an illustrative embodiment of this utility model and does not constitute any limitation on this utility model. Figures 1 to 2 The present invention provides a clamping device, which is installed on a machine tool spindle 1. A pull rod 2 is provided on the machine tool spindle 1. The clamping device includes a drive motor 100, an electric pull rod input shaft 200, a lead screw 300 and a lead screw nut 400.

[0043] The drive motor 100 is equipped with a motor output shaft 110, which can output rotational driving force.

[0044] The electric pull rod input shaft 200 has its first end rigidly connected to the motor output shaft 110, which allows the rotational driving force of the drive motor 100 to be directly and efficiently transmitted to the electric pull rod input shaft 200, simplifying the structure of the clamping device.

[0045] The first end of the lead screw 300 is directly connected to the second end of the electric pull rod input shaft 200, so that the driving force on the electric pull rod input shaft 200 can be directly transferred to the lead screw 300, further simplifying the structure of the clamping device. The reducer is no longer needed, so the driving force (i.e., torque force) on the lead screw 300 can be reduced, thereby preventing the clamping force of the clamping device from being too large.

[0046] The lead screw nut 400 is threadedly connected to the second end of the lead screw 300. The pull rod 2 is connected to the lead screw nut 400, so that the lead screw nut 400 can move along its own axial direction, thereby driving the lead screw 300 on the machine tool spindle 1 to also move along its own axial direction, thus realizing the clamping of the workpiece.

[0047] Specifically, the lead of the lead screw 300 and the lead screw nut 400 can be 5mm, 8mm or 10mm. For example, in this embodiment, the lead is 8mm, which better ensures that the drive of the drive motor 100 is converted into the axial power of the pull rod 2.

[0048] It is understood that the clamping device provided in the embodiments of this utility model, by rigidly connecting the first end of the electric pull rod input shaft 200 to the motor output shaft 110, and directly connecting the first end of the lead screw 300 to the second end of the electric pull rod input shaft 200, and the lead screw nut 400 and the lead screw 300 are connected by thread transmission; thus, it is no longer necessary to set up a reducer to transmit the driving force (i.e., torque force) of the drive motor 100 to the lead screw 300 to realize the axial movement of the lead screw nut 400; moreover, it can avoid the reducer amplifying the driving force, thereby reducing the clamping force of the clamping device, making the device more applicable, and can clamp thin-walled or elastic workpieces with low load-bearing capacity, without causing damage to thin-walled or elastic workpieces.

[0049] Combination Figure 1 In some embodiments of this utility model, the clamping device is provided with a main housing 500, the main housing 500 forms an accommodating space 510, and the electric pull rod input shaft 200 is rotatably disposed in the accommodating space 510 along its own central axis.

[0050] The clamping device also includes a rigid coupling 210, through which the first end of the electric pull rod input shaft 200 is directly connected to the motor output shaft 110. This simplifies the structure of the clamping device, increases transmission accuracy, and enables more precise workpiece clamping.

[0051] In addition, in some embodiments of this utility model, the clamping device further includes a connecting key 310, and the first end of the lead screw 300 is directly connected to the second end of the electric pull rod input shaft 200 through the connecting key 310; so that the torque force of the electric pull rod input shaft 200 can be better transmitted to the lead screw 300, which has high stability and simpler structure.

[0052] In addition, in some embodiments of this utility model, the clamping device further includes an electromagnetic clutch 600, which is disposed in the accommodating space 510 and matched with the electric pull rod input shaft 200. The electromagnetic clutch 600 can make the clamping device have a braking system, making it more convenient to control the clamping device to clamp the workpiece.

[0053] Furthermore, in some embodiments of this utility model, the clamping device further includes an encoder 700, which is mounted on the drive motor 100 and can monitor the number of rotations and torque of the drive motor 100.

[0054] The clamping device can precisely control the number of rotations and torque of the drive motor 100 based on the data from the encoder 700 to output driving force, thereby achieving precise control of the workpiece clamping force and further preventing workpiece deformation caused by excessive clamping force.

[0055] Combination Figure 1 In some embodiments of this utility model, the clamping device is further provided with a bearing 800, which is disposed in the accommodating space 510, and the lead screw 300 is connected to the bearing 800; this reduces the frictional force on the lead screw 300, thereby improving the flexibility of the lead screw 300.

[0056] Specifically, in some embodiments of this utility model, the bearing 800 can be a double-direction thrust ball bearing. This enhances the axial load-bearing capacity of the lead screw 300, enabling it to better cooperate with the lead screw nut 400 to pull the tie rod 2 along the axial direction.

[0057] Combination Figures 1 to 2 An embodiment of this utility model also provides a machine tool, which includes the above-described clamping device and machine tool body.

[0058] The clamping device is located on the machine tool body. The machine tool also includes a drawbar 2 and a machine tool spindle 1. The drawbar 2 passes through the machine tool spindle 1, and the clamping device is connected to the drawbar 2.

[0059] It is understood that the machine tool provided by the embodiments of this utility model, since it includes the above-mentioned clamping device, necessarily possesses all the advantages of the clamping device. That is, the machine tool can also transmit the driving force (i.e., torque force) of the drive motor 100 to the lead screw 300 without the need for a reducer, and can avoid the reducer amplifying the driving force, thereby reducing the clamping force of the clamping device, making the device more applicable, and able to clamp thin-walled or elastic workpieces with low load-bearing capacity without causing damage to such workpieces.

[0060] In this specification, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0061] In the description of this specification, the use of terms such as "preferred embodiment," "another embodiment," "some embodiments," "other embodiments," or "specific example," etc., refers to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0062] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A clamping device, wherein the clamping device is disposed on a machine tool spindle, the machine tool spindle being provided with a drawbar, characterized in that, The clamping device includes: The drive motor is equipped with a motor output shaft; An electric pull rod input shaft, the first end of which is rigidly directly connected to the motor output shaft; A lead screw, the first end of which is directly connected to the second end of the input shaft of the electric pull rod; A lead screw nut is threadedly connected to the second end of the lead screw, and the pull rod is connected to the lead screw nut.

2. The clamping device as described in claim 1, characterized in that, The clamping device has a main housing, which forms an accommodating space. The electric pull rod input shaft is rotatably mounted in the accommodating space along its own central axis. The clamping device also includes a rigid coupling, and the first end of the electric pull rod input shaft is directly connected to the motor output shaft through the rigid coupling.

3. The clamping device as described in claim 2, characterized in that, It also includes a connecting key, through which the first end of the lead screw is directly connected to the second end of the electric pull rod input shaft.

4. The clamping device as described in claim 1, characterized in that, The lead of the threaded connection between the lead screw and the lead screw nut is 5mm, 8mm or 10mm.

5. The clamping device as described in claim 2, characterized in that, It also includes an electromagnetic clutch, which is located in the accommodating space and matched with the input shaft of the electric lever.

6. The clamping device as described in claim 1, characterized in that, It also includes an encoder, which is located on the drive motor and is adapted to monitor the number of rotations and torque of the drive motor.

7. The clamping device as described in claim 2, characterized in that, The clamping device is also provided with a bearing, which is located in the accommodating space, and the lead screw is connected to the bearing.

8. The clamping device as described in claim 7, characterized in that, The bearing is a double-direction thrust ball bearing.

9. A machine tool, characterized in that, Includes the clamping device and machine tool body as described in any one of claims 1 to 8. The clamping device is located on the machine tool body.

10. The machine tool as described in claim 9, characterized in that, The machine tool also includes a tie rod and a machine tool spindle. The pull rod passes through the machine tool spindle, and the clamping device is connected to the pull rod.

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