Clamping Device Sliding Sleeve Reverse Rotation Prevention
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Solution Overview
Problem
Existing clamping devices for machine tools with power chucks are not secure during machining processes due to uncontrolled reverse rotation, leading to automatic opening and inability to be used in practice, as components involved in power transmission are not supported against reverse rotation.
Innovation Solution
A clamping device design where the servomotor is only connected during clamping and unclamping, with all power transmission components firmly connected to the machine spindle, using a controlled sliding sleeve and force accumulator to maintain clamping force, ensuring safe operation and preventing automatic opening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the servomotor is permanently connected to the movement converter during machining, then the power transmission components are supported against reverse rotation, but the clamping device cannot be adjusted and requires continuous energy consumption
Solution Approach 1:
The sliding sleeve dynamically changes the connection state between the servomotor and movement converter. During machining, it couples the movement converter to the machine spindle to prevent reverse rotation. During clamping/unclamping, it decouples from the spindle and couples to the servomotor, enabling adjustment while maintaining security during operation.
Solution Approach 2:
The power transmission path is segmented into two separate coupling mechanisms: one for connecting the movement converter to the machine spindle (for security), and another for connecting to the servomotor (for adjustment). The sliding sleeve selectively engages one path while disengaging the other, resolving the contradiction between continuous security and periodic adjustability.
2Adaptability or versatility
If the sliding sleeve is designed with multiple coupling positions, then both clamping adjustment and secure machining connection are enabled, but the device complexity increases
Solution Approach 1:
The sliding sleeve serves multiple functions: it acts as a coupling element between the servomotor and movement converter during adjustment, and as a coupling element between the movement converter and machine spindle during machining. This single component performs both coupling roles, reducing the need for separate mechanisms and managing complexity while achieving versatility.
3Ease of manufacture
If the components involved in power transmission are not supported against reverse rotation, then the construction cost is reduced, but the power chuck opens automatically during machining
Solution Approach 1:
The sliding sleeve is positioned in advance to couple the movement converter to the machine spindle before machining begins. This preliminary coupling prevents reverse rotation from occurring during machining, ensuring clamping force stability without requiring additional expensive components or complex anti-reverse mechanisms.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution ensures secure operation by preventing uncontrolled changes in clamping force and automatic opening, maintaining clamping force during machining, and allowing for defined post-tensioning, resulting in a safe, economical, and versatile clamping device with low energy consumption.
Implementation Method 1
an energy accumulator to maintain the clamping force
Implementation Method 2
the rotor of the servomotor is pushed axially into the middle position by the electromagnetic field that builds up between the stator and the rotor
Data Source
Figure 1
Figure 2
Figure 3
AI summary
In a clamping device (1) for machine tools (2) which is equipped with a power chuck (5) and whose clamping jaws (6) can be actuated via a drawbar (7), wherein the clamping device (1) has an electric servomotor (11), a motion converter (31) and a power storage device (41), the servomotor (11) can be directly connected to the motion converter (31) for triggering clamping movements by means of a controlled adjustable sliding sleeve (51). In addition, the motion converter (31) and the power storage device (41) are installed in a housing (21) that can be coupled to the machine spindle (3), and in the clamping position of the clamping device, the sliding sleeve (51) can be decoupled from the servomotor and the housing can be firmly connected to the motion converter (31) via this.This design ensures that the servomotor (11) only needs to be activated for clamping and unclamping a workpiece (10) and is therefore only in drive connection with the clamping device (1) during these operating states. During machining of the workpiece (10), all components of the clamping device (1) involved in power transmission are thus rigidly connected to the machine spindle (3), preventing any return movements of the power chuck (5). Furthermore, the energy storage device (41) allows for defined re-tensioning, ensuring the safe operation of the clamping device (1) at all times.