A concrete precast unit stripping device

Abstract

This invention relates to the field of precast component production technology and discloses a precast concrete demolding device, including a frame, a forming mold mounted on the frame, the forming mold including a bottom mold and several side molds, an air bladder mounted on the bottom mold, the air bladder being fixedly mounted on the bottom mold and connected to an automatic pressure stabilizing system for periodically replenishing the air bladder with air before the concrete initially sets to maintain a preset pressure, the side molds being slidably mounted on the frame and able to close with the bottom mold to form a mold cavity, and a driving component being provided between the frame and the side molds for driving the side molds to slide away from the bottom mold. Because concrete undergoes slight settlement and moisture evaporation during the initial setting process, the compressive load on the air bladder changes. The periodic air replenishment mechanism through the automatic pressure stabilizing system ensures that the air bladder is always in a "pre-lifted" state without over-expanding and damaging the concrete structure, thus overcoming the defect of traditional one-time inflation leading to pressure decay and demolding failure.

Description

Technical Field

[0001] This solution relates to the field of precast component production technology, specifically to a precast concrete component demolding device. Background Technology

[0002] In the construction industry, on traditional construction sites, cast-in-place concrete is generally used to form the walls and floors of buildings. However, the construction of cast-in-place walls and floors on construction sites has caused problems such as noise pollution, dust, and construction waste. In addition, traditional cast-in-place construction is often a "rough and ready operation", which can easily lead to problems such as wall cracking and floor leakage.

[0003] To improve the casting accuracy of concrete components such as walls and floor slabs, and to overcome quality bottlenecks caused by uncontrollable on-site environments and human error, the construction industry has creatively shifted the casting of concrete components from the site to the factory, resulting in standardized precast parts. This transformation breaks down the complex construction process into two stages: "factory prefabrication" and "on-site assembly." Within the enclosed factory workshop, high-precision steel molds, automated concrete placing booms, and intelligent steam curing kilns ensure that component production is no longer hampered by weather factors such as rain, snow, and temperature differences. The compaction of the concrete and the temperature and humidity during curing are at their optimal levels, resulting in strict control of component dimensional errors to the millimeter level, and surface smoothness and strength consistency far exceeding those achieved on-site. This "car-making-like-building-houses" model not only eliminates common quality defects such as honeycomb, pitting, cracks, and leaks at the source, but also significantly reduces on-site wet work through dry methods, achieving green goals such as reducing construction waste by approximately 80% and significantly reducing construction noise and dust.

[0004] After the component is formed, it needs to be demolded. Currently, the commonly used demolding methods are hoisting demolding and flipping demolding. Among them, flipping demolding is only suitable for demolding small concrete components due to limitations in operating space and load-bearing capacity. For large concrete components, hoisting demolding is usually used, in which the forming mold and the component inside the mold are lifted together by hoisting equipment. However, for hollow components, because the component is hollow inside, the side walls of the component are relatively weak. During hoisting demolding, when the component separates from the mold and lands on one side, there is a certain risk of damage to the component. Summary of the Invention

[0005] The present invention aims to provide a demolding device for precast concrete components, which achieves flexible and non-destructive demolding of precast concrete components by setting an air bladder in the bottom mold and cooperating with an automatic pressure stabilizing system.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a precast concrete demolding device, comprising a frame, a forming mold disposed on the frame, the forming mold comprising a bottom mold and a plurality of side molds, an air bladder disposed on the bottom mold, the air bladder being fixedly disposed on the bottom mold and connected to an automatic pressure stabilizing system for periodically replenishing the air bladder with air before the initial setting of the concrete to maintain a preset pressure, the side molds being slidably disposed on the frame and being able to enclose the bottom mold to form a mold cavity, and a driving component being disposed between the frame and the side molds for driving the side molds to slide away from the bottom mold.

[0007] The beneficial effects of this solution are as follows: During the initial setting of concrete, slight settlement and moisture evaporation occur, causing changes in the compressive load on the airbag. This solution utilizes an automatic pressure stabilization system for periodic air replenishment, dynamically compensating for pressure losses caused by minor leaks or load variations. This ensures the airbag remains in a "pre-lifted" state without over-expanding and damaging the concrete structure, thus overcoming the shortcomings of traditional methods where pressure decay after one-time inflation leads to demolding failure.

[0008] Furthermore, the automatic pressure stabilization system includes an air source, a pressure sensor, and a controller. A control valve is installed between the air source and the airbag, and they are connected through the control valve. The pressure sensor is used to monitor the internal pressure of the airbag in real time and transmit the signal to the controller. The controller is electrically connected to the control valve and can receive the signal transmitted by the pressure sensor and control the air source to replenish the airbag through the control valve.

[0009] Beneficial effects: Preferably, the airbag is divided into several independent air chambers along its height, and each independent air chamber has an exhaust channel at its bottom. The lower end of each exhaust channel is connected to an air source via a control valve, and the middle section passes through the control valve and the independent air chambers connected to it, and is fixedly connected to the top and bottom of the independent air chambers. By dividing the airbag into several independent air chambers along its height and connecting each with an exhaust channel, and the lower end of each exhaust channel being connected to an air source via a control valve, the air chambers in the airbag can be vented in stages during venting. This staged venting method effectively avoids the formation of a closed negative pressure cavity (i.e., vacuum back suction) between the component and the mold when a large airbag is vented all at once. This solution releases pressure in stages, allowing air to smoothly enter between the component and the airbag, eliminating vacuum suction, and enabling large components to fall smoothly under their own weight, completely solving the problem of difficult demolding of tall hollow components.

[0010] Preferably, the airbag is formed by vulcanizing a rubber matrix and a reinforcing layer encased inside the rubber matrix, and the outer surface of the airbag is coated with a water-based release agent layer.

[0011] Preferably, the reinforcing layer is made of nylon fabric.

[0012] Preferably, the air pressure range in the independent air chamber is 0.03 MPa to 0.05 MPa. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the split structure of the molding die according to an embodiment of the present invention; Figure 2 This is a block diagram illustrating the control principle of the automatic voltage stabilization system of the present invention; Figure 3 This is a cross-sectional view of the airbag compartment structure in Embodiment 2 of the present invention.

[0014] The reference numerals in the accompanying drawings include: bottom mold 110, airbag 120, air chamber 121, exhaust channel 122, side mold 130, drive component 131, air source 210, pressure sensor 220, controller 230, and control valve 240. Detailed Implementation

[0015] Example 1 Example 1 is basically as shown in the appendix. Figure 1-2 As shown, Figure 1-2 A precast concrete component demolding device is shown, comprising a frame on which a forming mold is mounted. The forming mold includes a bottom mold 110 and several side molds 130. An air bladder 120 is fixedly mounted on the bottom mold 110. The air bladder 120 is formed by vulcanizing a rubber matrix and a nylon fabric reinforcing layer wrapped inside the rubber matrix. The outer surface of the air bladder 120 is coated with a water-based release agent layer. The side molds 130 are slidably mounted on the frame and can close with the bottom mold 110 to form a mold cavity. A driving component 131 is provided between the frame and the side molds 130 for driving the side molds 130 to move laterally to achieve mold opening and closing. In this embodiment, the driving component 131 is a hydraulic cylinder or a pneumatic cylinder.

[0016] Airbag 120 is connected to an automatic pressure stabilization system, such as Figure 2 As shown, the automatic pressure stabilization system includes an air source 210, a pressure sensor 220, a controller 230, and a control valve 240. The pressure sensor 220 is used to monitor the air pressure inside the airbag 120 in real time and transmit the monitoring signal to the controller 230. The controller 230 is electrically connected to the control valve 240, which is located on the pipeline between the air source 210 and the airbag 120.

[0017] Before the concrete is poured and enters the initial setting stage, the controller 230 initiates a periodic monitoring program. The controller 230 sets a sampling period T. In this embodiment, the sampling period T is set to 30 seconds. When the pressure sensor 220 detects that the pressure P inside the airbag 120 is less than 0.03 MPa, the controller 230 outputs a signal to open the control valve 240, and the air source 210 replenishes gas into the airbag 120. When the detected pressure P is greater than or equal to 0.05 MPa, the controller 230 outputs a signal to close the control valve 240.

[0018] Example 2 Based on Example 1, in order to accommodate large components with a height exceeding 150cm, such as Figure 3 As shown, the airbag 120 is divided into several independent air chambers 121 along the height direction. Each independent air chamber 121 has an exhaust channel 122 at its bottom. The lower end of the exhaust channel 122 is connected to the air source 210 through a control valve 240, and the middle part passes through the control valve 240 and the independent air chamber 121 connected to the independent air chamber 121 in sequence, and is fixedly connected to the top and bottom of the independent air chamber 121.

[0019] When demolding is required, the controller 230 controls the timing of the venting channel 122. A segmented venting method from bottom to top is preferred. First, the vent valve of the lowest independent air chamber 121 is opened to release air, causing the bottom of the component to lose support and breaking the bottom seal; then, the vent valves in the middle and upper sections are opened sequentially upwards.

[0020] The above descriptions are merely embodiments of the present invention, and common knowledge such as specific technical solutions and / or characteristics are not described in detail here. It should be noted that the technical means for solving problems in the above embodiments of the present invention can be used in combination to solve multiple technical problems simultaneously. For those skilled in the art, several modifications and improvements can be made without departing from the technical solutions of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A demolding device for precast concrete components, characterized in that: The machine includes a frame, on which a forming mold is mounted. The forming mold includes a bottom mold and several side molds. An air bladder is mounted on the bottom mold and is fixedly mounted on the bottom mold. It is connected to an automatic pressure stabilizing system for periodically replenishing the air bladder with air before the concrete initially sets to maintain a preset pressure. The side molds are slidably mounted on the frame and can be closed with the bottom mold to form a mold cavity. A driving component is provided between the frame and the side molds to drive the side molds to slide away from the bottom mold.

2. The precast concrete component demolding device according to claim 1, characterized in that: The automatic pressure stabilization system includes an air source, a pressure sensor, and a controller. A control valve is installed between the air source and the airbag, and they are connected through the control valve. The pressure sensor is used to monitor the internal pressure of the airbag in real time and transmit the signal to the controller. The controller is electrically connected to the control valve and can receive the signal transmitted by the pressure sensor. It can also control the air source to replenish the airbag through the control valve.

3. The precast concrete component demolding device according to claim 2, characterized in that: The airbag is divided into several independent air chambers along the height direction. Each independent air chamber has an exhaust channel at the bottom. The lower end of the exhaust channel is connected to the air source through a control valve. The middle part passes through the control valve and the independent air chambers connected to it, and is fixedly connected to the top and bottom of the independent air chambers.

4. A precast concrete component demolding device according to claim 3, characterized in that: The airbag is made of a rubber matrix and a reinforcing layer wrapped inside the rubber matrix through vulcanization, and the outer surface of the airbag is coated with a water-based release agent layer.

5. A precast concrete component demolding device according to claim 4, characterized in that: The reinforcing layer is made of nylon fabric.

6. A precast concrete component demolding device according to claim 5, characterized in that: The air pressure range in the independent air chamber is 0.03MPa to 0.05MPa.

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