Viscous Material Follower Plate Pressure Equalization
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Solution Overview
Problem
Existing devices for conveying viscous materials from barrel-like containers pose safety risks during container exchange due to the need for manual pressure equalization, which can lead to accidental retraction of the follower plate caused by excess pressure, potentially damaging the container or injuring the operator.
Innovation Solution
Incorporation of a diverting valve or pressure-measuring elements with a control device to automatically manage pressure in the pressure chambers, ensuring safe pressure equalization and preventing excessive pressure buildup during the follower plate's upward movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual pressure equalization is required during container exchange, then the device structure remains simple, but safety risks increase due to potential accidental retraction of the follower plate
Solution Approach 1:
The diverting valve is pre-configured to automatically redirect pressure medium from the first pressure chamber to the second pressure chamber when the follower plate begins to move upward. This preliminary automatic pressure equalization eliminates the need for manual intervention and prevents dangerous pressure buildup before it can occur.
Solution Approach 2:
The system uses its own pressure medium (compressed air or hydraulic fluid) to automatically equalize pressures between the two chambers during follower plate retraction. The pressure medium self-regulates by flowing from the high-pressure first chamber to the low-pressure second chamber, eliminating external intervention and improving safety.
2Ease of operation
If compressed air is introduced through the ventilation opening to move the follower plate upward, then the follower plate can be easily extracted, but excess pressure can cause dangerous retraction
Solution Approach 1:
The diverting valve acts as an intermediary component that mediates between the compressed air supply and the pressure chambers. It automatically redirects excess pressure medium from the first chamber to the second chamber, preventing dangerous pressure buildup while maintaining the ability to easily extract the follower plate.
Solution Approach 2:
The system creates a feedback loop where pressure changes in the first chamber automatically trigger pressure medium flow to the second chamber through the diverting valve. This continuous pressure balancing feedback prevents excess pressure accumulation that could cause dangerous follower plate retraction.
3Productivity
If the piston is rigidly connected to the follower plate, then the follower plate moves upward effectively, but pressure medium compression occurs when the operator is inattentive
Solution Approach 1:
The diverting valve is pre-positioned to activate before significant pressure buildup can occur in the first chamber. When the follower plate begins its upward movement, the valve automatically redirects pressure medium to the second chamber, preventing the dangerous compression scenario while maintaining effective follower plate movement.
Solution Approach 2:
The system provides beforehand cushioning by having the diverting valve ready to redirect excess pressure medium before dangerous compression can occur. This protective mechanism is in place beforehand, automatically activating when pressure conditions warrant it, thus cushioning against potential safety hazards.
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
Enhances safety by automating pressure management, preventing accidental retraction of the follower plate and reducing the risk of injury or damage during container exchange processes.
Implementation Method 1
a double-acting cylinder (34) with two pressure chambers (38, 40) and a support device (32), the piston (36) being connected to the support device (32) by means of a piston rod (42)
Implementation Method 2
a ventilation device (50) for introducing compressed air through the ventilation opening (48)
Data Source
Figure 1
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AI summary
The invention relates to a device (10, 110, 210) for conveying viscous material (26) out of a barrel-like container (12) which has a container base (14) and a container shell (16) which extends upward from the container base (14), having a follower plate (18) for closing off the container (12), which follower plate, bearing against the inner surface (20), facing toward the container interior (24), of the container shell (16), is movable in a direction toward the container base (14) and away from the container base (14), and which follower plate has a material outlet opening and a ventilation opening (48), having a pump for conveying the viscous material (26) through the material outlet opening, and having a ventilation device (50) for introducing compressed air through the ventilation opening (48) and having a lowering device (30) for lowering the follower plate (18) in the container (12), which lowering device has at least one double-acting cylinder (34) with two pressure chambers (38, 40) which are delimited in pressure-tight fashion with respect to one another by a piston (36) and has a supporting device (32) which supports the follower plate (18), wherein the piston (36) is connected, by way of a piston rod (42) which runs through a first of the pressure chambers (38) and which is led axially out of the cylinder (34), to the supporting device (32) in such a way that the first pressure chamber (38) is reduced in size when the follower plate (18) is lifted in the direction away from the container base (14). According to the invention, a discharge valve (58) is provided which, in a first switching position, blocks a line (60) which leads out of the first pressure chamber (38), and which, in a second switching position, opens the line (60) for the purposes of discharging pressure medium out of the first pressure chamber (38).