Interchangeable Chisel Holder with Fixed Trailing Tip
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Solution Overview
Problem
Soil tillage machines face high operating costs due to frequent maintenance and loss of chisels, particularly those with polycrystalline diamond tips, which wear faster than the holder and become difficult to replace, leading to increased costs and reduced service life.
Innovation Solution
An interchangeable chisel holder design where the trailing chisel is fixed axially and circumferentially, with a superhard material tip, such as diamond or silicon carbide, to extend its service life and reduce maintenance needs, while the leading chisel is rotatable for uniform wear and easy exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If the trailing chisel is made with superhard material tip to reduce wear, then the service life of the trailing chisel is extended, but the cost of the chisel increases significantly
Solution Approach 1:
The trailing chisel is equipped with a superhard material tip (polycrystalline diamond, cubic boron nitride, or diamond-reinforced material) only at the cutting edge region, while the rest of the chisel body remains made of conventional materials. This localized application of superhard material extends the service life where it is most needed (at the wear-prone cutting edge) without incurring the full cost of a completely superhard chisel.
Solution Approach 2:
The trailing chisel combines superhard materials (for the tip) with conventional materials (for the body) to create a composite structure that leverages the extreme hardness and wear resistance of superhard materials at the cutting edge while maintaining the cost-effectiveness and structural integrity of conventional materials for the chisel body.
2Ease of repair
If the trailing chisel is made exchangeable like the leading chisel, then it can be replaced when worn, but it becomes vulnerable to loss and requires frequent maintenance
Solution Approach 1:
The chisel system is segmented into two functional parts: the leading chisel (made exchangeable with simple quick-change mechanism) and the trailing chisel (made non-exchangeable or difficult-to-exchange with integrated mounting). This segmentation allows the leading chisel to be easily replaced when worn, while the trailing chisel remains securely attached to prevent loss and reduce maintenance frequency.
Solution Approach 2:
Instead of making both chisels exchangeable (conventional approach), the invention inverts the approach by making the trailing chisel non-exchangeable or difficult-to-exchange, while keeping the leading chisel exchangeable. This reversal of the conventional wisdom resolves the contradiction by prioritizing retention for the trailing chisel over replaceability.
3Ease of operation
If the trailing chisel is held loosely in the holder, then it can be easily exchanged, but it becomes vulnerable to loss and the holder wears faster
Solution Approach 1:
The trailing chisel is merged with the chisel holder through a non-exchangeable or difficult-to-exchange connection mechanism, creating an integrated assembly. This merging prevents the trailing chisel from becoming loose or lost, while the leading chisel maintains its exchangeable connection for easy replacement when needed.
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
This design significantly reduces the frequency of chisel exchanges, lowers operating costs, and maintains a uniform milled surface pattern by extending the service life of the trailing chisel to match that of the chisel holder, with the leading chisel's wear determining maintenance intervals.
Implementation Method 1
the trailing chisel, based on a working movement of the interchangeable chisel holder when used in the soil tillage machine, is arranged after the leading chisel receiving fixture... the trailing chisel is held on the interchangeable chisel holder such that it is fixed axially and in its circumferential direction... with a superhard material tip, such as diamond or silicon carbide, to extend its service life
Data Source
AI summary
The invention relates to an interchangeable chisel holder (40) which can be fixed to a milling drum (15) of a ground-working machine (10), having a forward chisel holder (42) for the interchangeable holding of a forward chisel (20), preferably a round-shaft chisel, and having a rearward chisel (30, 31), which is held on the interchangeable chisel holder (40), wherein, as based on a working movement (76) of the interchangeable chisel holder (40) when used in the ground-working machine (10), the rearward chisel (30, 31) is arranged behind the forward chisel holder (42). In such an interchangeable candleholder (40) provision can be made, according to the invention, for the rearward chisel (30, 31) to be held on the interchangeable chisel holder (40) axially and fixed in the circumferential direction of the chisel holder. Maintenance-induced stoppages of the ground-working machine can thus be reduced and the loss of chisels can at least be lowered.