Demolding method for inner mold of concrete prefabricated part

Abstract

The invention discloses a demolding method for an inner mold of a concrete prefabricated part, and belongs to the field of demolding of concrete prefabricated parts. According to the technical scheme, the demolding method for the inner mold of the concrete prefabricated part comprises the following steps that S1, after the concrete prefabricated part is formed, the inner mold and the concrete prefabricated part are inverted, and air is inflated into an air bag after the inner mold and the concrete prefabricated part are inverted; and S2, when inflation reaches a certain pressure, the air bag expands, the air bag punches the partition plate, and the partition plate drives the inner mold cavity to move downwards, so that the inner mold cavity is separated from the bottom plate. The mold is applied to demolding of the inner mold of the concrete prefabricated part and solves the technical problem that demolding of the inner mold in an existing concrete prefabricated part forming mold is difficult.

Description

Technical Field

[0001] The invention belongs to the field of demoulding of prefabricated concrete parts, and in particular relates to a demoulding method of an inner mold of a prefabricated concrete part. Background Art

[0002] Precast concrete parts are a type of component used in the fields of construction, transportation, water conservancy, etc. At present, precast concrete parts are widely used and have the characteristics of easy construction and strong stability.

[0003] However, this kind of prefabricated concrete parts are mostly made by custom-made molds during the production process, and demoulding is inevitably required through custom-made molds. Demolding includes outer mold demoulding and inner mold demoulding. However, the current methods for demoulding the inner mold are: 1. Manual knocking followed by hoisting and demoulding; 2. The inner mold is set as a splicing mold, which also requires manual knocking and then demoulding each splicing section mold separately. The above two demoulding methods both have the inconvenience of knocking the inner mold, and it is difficult for the staff to control the knocking force and keep the knocking point position uniform, which can easily cause cracks, missing edges and corners in the prefabricated concrete parts. Summary of the invention

[0004] The details of one or more embodiments of the present invention are set forth in the following drawings and description to make other features, objects, and advantages of the present application more readily apparent.

[0005] The present invention provides a method for demoulding an inner mold of a precast concrete part, which solves the technical problem that it is difficult to demould the inner mold in the current precast concrete part forming mold, has the characteristics of fast and convenient demoulding, high demoulding efficiency, and can ensure the integrity of the precast concrete part, and can be demoulded without manual knocking.

[0006] The present invention discloses a demoulding method for an inner mold of a precast concrete part. The inner mold of the precast concrete part is sleeved in the precast concrete part. The inner mold of the precast concrete part comprises an inner mold cavity, a bottom plate, a partition, and an air bag. The inner mold cavity is a hollow cavity that passes through from top to bottom. The bottom plate is located at the bottom of the inner mold cavity. The bottom plate and the bottom periphery of the inner mold cavity are mutually attached. The partition is located inside the hollow cavity of the inner mold cavity. The partition is parallel to the bottom plate. The partition is fixed to the periphery of the hollow cavity of the inner mold cavity. The partition is connected to the bottom plate, a cavity is formed between the partition and the bottom plate, and the airbag is located in the cavity; the method for demoulding the inner mold of the precast concrete part comprises the following steps: S1, after the precast concrete part is formed, the inner mold of the precast concrete part and the precast concrete part are inverted, and after inversion, air is inflated into the airbag; S2, when the inflation reaches a certain pressure, the airbag expands, the airbag punches the partition, and the partition drives the inner mold cavity to move downward, so that the inner mold cavity is separated from the bottom plate.

[0007] In some embodiments, the precast concrete part inner mold further includes a first ventilation pipe, and the first ventilation pipe is connected to the airbag; the method further includes inverting the precast concrete part inner mold and the precast concrete part by hoisting, and after inversion, inflating the airbag through the first ventilation pipe.

[0008] In some embodiments, the precast concrete part inner mold further comprises a second vent pipe, which is communicated with the cavity; the method further comprises inflating the cavity through the second vent pipe while inflating the airbag through the first vent pipe.

[0009] In some of the embodiments, the method further comprises stopping inflation when the inflation pressure in the airbag reaches 1.5-2 tons, at which time the airbag punches the partition.

[0010] In some of the embodiments, the method further includes inverting the precast concrete part and the precast concrete part inner mold after the inner mold cavity is separated from the bottom plate, and separating the inner mold cavity together with the bottom plate from the precast concrete part by a lifting device to complete the demolding of the precast concrete part inner mold.

[0011] In some embodiments, the partition is provided with multiple through holes, each of which is provided with a sealing structure, one end of the first ventilation pipe is connected to the airbag through the through hole, and one end of the second ventilation pipe is connected to the cavity through the through hole.

[0012] In some embodiments, the precast concrete part inner mold further includes a support plate, which is disposed on a side of the partition away from the cavity and spaced apart from the partition, and a plurality of support plates are provided, and an elastic element is provided between the partition and the support plate, and the elastic element is any one of a steel wire spring, a coil spring, an alloy spring, and a compression spring.

[0013] In some embodiments, the precast concrete inner mold further includes a spring bracket, one end of which is connected to the bottom plate, the spring bracket passes through the through hole on the partition, the other end of the spring bracket is connected to the support plate, the elastic element is sleeved on the spring bracket, and when the airbag is in a compressed state, the distance between the partition and the support plate is 7 to 10 cm.

[0014] In some embodiments, the number of the elastic elements, the number of the spring brackets and the number of the support plates are the same.

[0015] In some embodiments, the base plate is beveled on all sides. When the precast concrete part is in the process of being formed, the base plate is located at the bottom of the inner mold cavity, and the base plate is in contact with the inner mold cavity. When the precast concrete part is in the process of being demolded, the precast concrete part and the inner mold are inverted, the air bag expands, and the base plate is separated from the inner mold cavity.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The demoulding method for an inner mold of a precast concrete part disclosed by the present invention has the characteristics of fast and convenient demoulding, high demoulding efficiency, and can ensure the integrity of the precast concrete part, and can be demoulded without the need for manual knocking. After the precast concrete part is formed, the inner mold and the precast concrete part are inverted without the need for manual knocking, and then the air bag in the inner mold of the precast concrete part unique to the present invention is inflated. When the inflation reaches a certain pressure, the air bag expands, and the air bag punches the partition, and the partition drives the inner mold cavity to move downward, so that the inner mold cavity is separated from the bottom plate. This demoulding method is not only simple and easy to operate, but also can save manual operation, has high demoulding efficiency, and can better ensure the integrity of the precast concrete part.

[0018] In order to realize the convenience of inflating the airbag in the present invention, a first vent pipe is designed in the inner mold of the precast concrete part, which directly leads to the airbag in the inner mold, and then the inflation valve is opened to directly inflate. This method is simple and convenient.

[0019] In order to further realize rapid and convenient demoulding in the present invention, a second ventilation pipe is designed in the inner mold of the concrete precast part. One end of the second ventilation pipe passes through the hollow cavity of the inner mold cavity and then communicates with the cavity after penetrating the partition. The inflation valve is opened to inflate the second ventilation pipe, so that the air in the cavity can be inflated. The gas in the cavity will overflow through the gap between the bottom plate and the inner mold cavity, so that the negative pressure between the concrete precast part and the inner mold cavity is reduced, making it easier to demould the inner mold.

[0020] In order to further separate the entire inner mold from the concrete precast part more quickly in the present invention, after the inner mold cavity is separated from the bottom plate, the concrete precast part and the inner mold are inverted, and the inner mold cavity together with the bottom plate are separated from the concrete precast part by a hoisting device to complete the demoulding of the inner mold; if it is still in an inverted state, pulling the inner mold cavity downward not only requires sufficient space for pulling downward, but also requires suitable tools for pulling downward. However, the present invention inverts the concrete precast part and the inner mold so that the inner mold faces upward, and only the inner mold needs to be removed upward by a hoisting device, which is simple and convenient.

[0021] In the present invention, sealing structures are provided at the through holes in the inner mold of the precast concrete part, so that the second ventilation pipe only inflates the cavity between the partition and the bottom plate during inflation, so that the gas can overflow from the gap between the bottom plate and the inner mold cavity to between the precast concrete part and the inner mold cavity, thereby reducing the negative pressure between the two, and the gas will not penetrate from the through hole to the side of the partition away from the cavity, causing waste, etc.

[0022] In the present invention, an elastic element is provided between the partition and the support plate in the inner mold of the concrete precast part, so that after the airbag is inflated, a certain buffer distance can be given to the partition when the partition moves downward. The elastic element is selected to be any one of a steel wire spring, a spiral spring, an alloy spring, and a compression spring. The elastic element is preferably a spring with good elasticity and a good buffering effect.

[0023] In the present invention, a spring bracket is designed in the inner mold of the concrete precast part, and one end of the spring bracket is connected to the bottom plate, so that the spring bracket and the bottom plate are integrated. When the inner mold cavity is ejected, the bottom plate will be ejected together through the spring bracket, and finally the entire inner mold is ejected. The elastic element is sleeved on the spring bracket and arranged between the partition and the support plate, so that the partition can drive the inner mold cavity to be ejected together. The number of elastic elements, the number of spring brackets and the number of support plates are all the same, which can produce a better buffering effect. When the airbag is in a compressed state, the distance between the partition and the support plate is 7 to 10 cm. This arrangement is to provide a certain buffering distance between the inner mold cavity and the bottom plate after the airbag is inflated, and can withstand the inflation pressure of 1.5 to 2 tons of the airbag.

[0024] In the present invention, the bottom plate in the inner mold of the precast concrete part is beveled on all sides, which makes demoulding easier; when the precast concrete part is in the molding process, the bottom plate is located at the bottom of the inner mold cavity, and the bottom plate fits with the inner mold cavity. This fit is to prevent concrete from penetrating into the inner mold cavity during the molding process. When the precast concrete part is in the demoulding process, the precast concrete part and the inner mold are first inverted, the air bag is inflated to expand the air bag, and the partition is pushed downward by the air bag, and the partition drives the inner mold cavity to be ejected, so that the bottom plate is separated from the inner mold cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0026] Figure 1 A cross-sectional view of an inner mold of a precast concrete part during molding provided by an embodiment of the present invention;

[0027] Figure 2 A cross-sectional view of an inner mold of a precast concrete part during demoulding provided by an embodiment of the present invention;

[0028] Figure 3 A schematic diagram of the structure of a partition provided by an embodiment of the present invention;

[0029] Figure 4 A schematic diagram of the structure of an airbag during inflation provided by an embodiment of the present invention;

[0030] Figure 5 A flow chart of a method for demoulding an inner mold of a precast concrete part provided in an embodiment of the present invention;

[0031] In the above figures: 1-inner mold cavity; 2-bottom plate; 3-partition plate; 4-airbag; 5-first ventilation pipe; 6-second ventilation pipe; 7-cavity; 8-through hole; 9-spring bracket; 10-elastic element; 11-support plate; 12-sealing structure. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical scheme and advantages of the present invention more clearly understood, the present invention is described and illustrated below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. Based on the embodiments provided by the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention.

[0033] Obviously, the drawings described below are only some examples or embodiments of the present invention. For ordinary technicians in this field, the present invention can also be applied to other similar scenarios based on these drawings without creative work. In addition, it can also be understood that although the efforts made in this development process may be complicated and lengthy, for ordinary technicians in this field related to the content disclosed by the present invention, some changes in design, manufacturing or production based on the technical content disclosed by the present invention are just conventional technical means, and should not be understood as insufficient content disclosed by the present invention.

[0034] Reference to "embodiments" in the present invention means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those of ordinary skill in the art that the embodiments described in the present invention may be combined with other embodiments without conflict.

[0035] Unless otherwise defined, the technical terms or scientific terms involved in the present invention shall have the usual meanings understood by persons with ordinary skills in the technical field to which the present invention belongs. The words "one", "a", "a", "the" and the like involved in the present invention do not indicate a quantity limitation and may indicate the singular or plural. The terms "include", "comprise", "have" and any of their variations involved in the present invention are intended to cover non-exclusive inclusions; for example, a process, method, system, product or device including a series of steps or modules (units) is not limited to the listed steps or units, but may also include steps or units that are not listed, or may also include other steps or units inherent to these processes, methods, products or devices. The words "connect", "connected", "coupled" and the like involved in the present invention are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The "multiple" involved in the present invention refers to two or more. "And / or" describes the association relationship of associated objects, indicating that there may be three relationships, for example, "A and / or B" may indicate: A exists alone, A and B exist at the same time, and B exists alone. The character “ / ” generally indicates that the previous and next associated objects are in an “or” relationship.

[0036] The embodiment of the present invention provides a method for demoulding an inner mold of a precast concrete part. Figure 1 is a cross-sectional view of an inner mold of a precast concrete part during molding according to an embodiment of the invention, Figure 2 is a cross-sectional view of an inner mold of a precast concrete part during demoulding according to an embodiment of the present invention, Figure 3 is a schematic diagram of the structure of a partition according to an embodiment of the present invention, Figure 4 is a schematic diagram of the structure of an airbag during inflation according to an embodiment of the present invention, Figure 5 Flow chart of a method for demoulding an inner mold of a precast concrete part according to an embodiment of the present invention. Figure 1-4 As shown, the device at least includes: an inner mold cavity 1, a bottom plate 2, a partition 3, and an airbag 4. The inner mold cavity 1 is a hollow cavity that passes through from top to bottom. The bottom plate 2 is located at the bottom of the inner mold cavity 1. The bottom plate 2 and the bottom periphery of the inner mold cavity 1 are in contact with each other. The partition 3 is located inside the hollow cavity of the inner mold cavity 1. The partition 3 is parallel to the bottom plate 2. The partition 3 is fixedly connected to the periphery of the hollow cavity of the inner mold cavity 1. A cavity 7 is formed between the partition 3 and the bottom plate 2, and the airbag 4 is located in the cavity 7; refer to Figure 5As shown, the demoulding method of the inner mold of the concrete precast part includes the following steps: S1, after the concrete precast part is formed, the inner mold and the concrete precast part are inverted, and air is inflated into the airbag 4 after inversion; S2, when the inflation reaches a certain pressure, the airbag 4 expands, and the airbag 4 punches the partition 3, and the partition 3 drives the inner mold cavity 1 to move downward, so that the inner mold cavity 1 is separated from the bottom plate 2; this demoulding method has the advantages of fast and convenient demoulding, high demoulding efficiency, and can ensure the integrity of the concrete precast part, and can be demoulded without manual knocking. Features: After the precast concrete part is formed, the inner mold and the precast concrete part are inverted without manual knocking, and then the air bag 4 in the inner mold of the precast concrete part unique to the present invention is inflated. When the inflation reaches a certain pressure, the air bag 4 expands, and the air bag 4 punches the partition 3. The partition 3 drives the inner mold cavity 1 to move downward, so that the inner mold cavity 1 is separated from the bottom plate 2. This demoulding method is not only simple and easy to operate, but also can save manual operation, has high demoulding efficiency, and can better ensure the integrity of the precast concrete part.

[0037] Furthermore, when the method for demoulding the inner mold of a precast concrete part of the present invention is used, the inner mold of the precast concrete part also includes a first vent pipe 5, which is connected to the airbag 4. By designing the first vent pipe 5, the airbag 4 in the inner mold is directly connected to the airbag 4 through the first vent pipe 5, and then the inflation valve is opened to directly inflate. This method is simple and convenient. The method also includes inverting the inner mold and the precast concrete part by hoisting, and inflating the airbag 4 through the first vent pipe 5 after inversion. This inversion method can not only use the inflation pressure of the airbag 4 to remove the inner mold, but also use the gravity of the inner mold itself to make it easier to remove.

[0038] Furthermore, the inner mold of the precast concrete part used in the method of the present invention is also designed with a second vent pipe 6, which is communicated with the cavity 7; when demolding, while inflating the air bag 4 through the first vent pipe 5, the cavity 7 is inflated through the second vent pipe 6, and the gas in the cavity 7 will overflow through the gap between the bottom plate 2 and the inner mold cavity 1, so that the negative pressure between the precast concrete part and the inner mold cavity 1 is reduced, so that during demolding, not only can the precast concrete part be pushed outward by the pressure of the air bag 4, but also the negative pressure between the precast concrete part and the inner mold cavity 1 can be reduced, which ultimately makes the inner mold demolding faster and more convenient.

[0039] Furthermore, in the method of the present invention, the instantaneous pressure generated by the airbag 4 on the partition 3 can push out the inflation pressure of the partition 3, which is preferably 1.5-2 tons. In some other embodiments, airbags 4 of different specifications can be selected according to the size of the mold, and the inflation pressure of the airbag 4 can also be appropriately set.

[0040] Furthermore, in order to further separate the entire inner mold from the precast concrete part more quickly in the method of the present invention, after the inner mold cavity 1 is separated from the base plate 2, the precast concrete part and the inner mold are inverted, and the inner mold cavity 1 together with the base plate 2 are separated from the precast concrete part by a lifting device to complete the demoulding of the inner mold; if it is still in an inverted state, pulling the inner mold cavity 1 downward not only requires sufficient space for pulling downward, but also requires suitable tools for pulling downward. However, the present invention inverts the precast concrete part and the inner mold so that the inner mold faces upward, and only the inner mold needs to be removed upward by a lifting device, which is simple and convenient.

[0041] Furthermore, a plurality of through holes 8 are provided on the partition 3 in the inner mold of the precast concrete part used in the method of the present invention, and a sealing structure 12 is provided at each of the through holes 8. One end of the first ventilation pipe 5 is connected to the airbag 4 through the through hole 8, and one end of the second ventilation pipe 6 is communicated with the cavity 7 through the through hole 8; wherein, a sealing structure 12 is provided at each of the through holes 8 in the inner mold of the precast concrete part, so that the second ventilation pipe 6 only inflates the cavity 7 between the partition 3 and the bottom plate 2 during inflation, so that the gas overflows from the gap between the bottom plate 2 and the inner mold cavity 1 to between the precast concrete part and the inner mold cavity 1, so that the negative pressure between the two is reduced, and the gas will not penetrate from the through hole to the side of the partition 3 away from the cavity 7 during inflation, causing waste, etc.

[0042] In some embodiments, four through holes 8 are provided on the partition plate 3 , wherein the four through holes 8 are used to penetrate the first ventilation pipe 5 , the second ventilation pipe 6 and the two spring brackets 9 , respectively.

[0043] Furthermore, a plurality of support plates 11 are also designed in the inner mold of the precast concrete part used in the method of the present invention. Preferably, there are two support plates 11, which are respectively located on the left and right sides of the airbag 4 to play a role of symmetrical balance. The support plate 11 is arranged on the side of the partition 3 away from the cavity 7 and is spaced apart from the partition 3. There are a plurality of support plates 11. An elastic element 10 is arranged between the partition 3 and the support plate 11. The elastic element is any one of a wire spring, a spiral spring, an alloy spring, and a compression spring. Among them, the elastic element 10 is designed between the partition 3 and the support plate 11 in the inner mold of the precast concrete part, so that after the airbag 4 is inflated, the partition 3 can be given a certain buffer distance when it is pulled out downward. The selected elastic element 10 is any one of a wire spring, a spiral spring, an alloy spring, and a compression spring. The elastic element 10 is preferably a spring, which has good elasticity and good buffering effect.

[0044] Furthermore, a plurality of spring brackets 9 are also designed in the inner mold of the precast concrete part used in the method of the present invention. Preferably, there are two spring brackets 9, which are respectively located on the left and right sides of the airbag 4 to play a role of symmetrical balance. One end of the spring bracket 9 is connected to the bottom plate 2, and the spring bracket 9 passes through the through hole 8 on the partition 3. The other end of the spring bracket 9 is connected to the support plate 11. The elastic element 10 is sleeved on the spring bracket 9. When the airbag 4 is in a compressed state, the distance between the partition 3 and the support plate 11 is 7 to 10 cm. The number of elastic elements 10, the number of spring brackets 9 and the number of support plates 11 are all the same. By designing the spring bracket 9 in the inner mold of the precast concrete part and connecting one end of the spring bracket 9 to the bottom plate 2, The spring bracket 9 is integrated with the base plate 2. When the inner mold cavity 1 is ejected, the base plate 2 will be ejected together through the spring bracket 9, and finally the entire inner mold is ejected. The elastic element 10 is sleeved on the spring bracket 9 and arranged between the partition 3 and the support plate 11, so that the partition 3 can drive the inner mold cavity 1 to be ejected together. The number of elastic elements 10, the number of spring brackets 9 and the number of support plates 11 are the same, which can produce a better buffering effect. When the airbag 4 is in a compressed state, the distance between the partition 3 and the support plate 11 is 7 to 10 cm. This setting is to provide a certain buffering distance between the inner mold cavity 1 and the base plate 2 after the airbag 4 is inflated, so that the airbag 4 can withstand an inflation pressure of 1.5-2 tons.

[0045] Furthermore, the four sides of the bottom plate 2 in the inner mold of the precast concrete part used in the method of the present invention are arranged to be beveled, which is more convenient for demolding. When the precast concrete part is in the process of forming, the bottom plate 2 is located at the bottom of the inner mold cavity 1, and the bottom plate 2 fits with the inner mold cavity 1. This fit is to prevent concrete from penetrating into the inner mold cavity 1 during the forming process. When the precast concrete part is in the process of demolding, the precast concrete part and the inner mold are first inverted, and the airbag 4 is inflated to expand the airbag 4, and the partition 3 is pushed downward by the airbag 4. The partition 3 drives the inner mold cavity 1 to come out, so that the bottom plate 2 is separated from the inner mold cavity 1.

[0046] Furthermore, in some embodiments, the outer surface of the inner mold cavity 1 may be coated with a lubricant, which makes it easier to demold the inner mold.

[0047] Furthermore, the demoulding method of the inner mold of the concrete precast part of the present invention is as follows: when the concrete precast part is in the molding process, the inner mold cavity 1 in the inner mold fits with the bottom plate 2, and at this time, the airbag 4 and the cavity 7 are simultaneously evacuated through the first ventilation pipe 5 and the second ventilation pipe 6, so that the airbag 4 is in a compressed state, and the cavity 7 is in a closed space. At the same time, the inner mold cavity 1 and the concrete precast part are in a negative pressure state, the fit is tighter, and the molding effect is better. After the concrete precast part is formed, the entire mold is inverted, and at this time, the first ventilation pipe 5 is simultaneously evacuated to the first ventilation pipe 5. And inflate the second ventilation pipe 6, inflate the airbag 4 through the first ventilation pipe 5, and inflate the cavity 7 through the second ventilation pipe 6. When the inflation pressure in the airbag 4 reaches 1.5-2 tons, the gas in the cavity 7 will also enter between the inner mold cavity 1 and the concrete precast part from the gap between the bottom plate 2 and the inner mold cavity 1, so that the negative pressure between the two is reduced. At this time, the airbag 4 drives the partition 3 to push the inner mold cavity 1 downward, and then the inner mold cavity 1 drives the bottom plate 2 to be removed together through other tools, thereby finally realizing the separation of the inner mold and the concrete precast part.

[0048] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0049] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A method for demoulding an inner mold of a precast concrete part, characterized in that: The inner mold of the precast concrete part is sleeved in the precast concrete part, and the inner mold of the precast concrete part includes an inner mold cavity, a bottom plate, a partition, and an air bag. The inner mold cavity is a hollow cavity that passes through from top to bottom. The bottom plate is located at the bottom of the inner mold cavity, and the bottom plate and the bottom periphery of the inner mold cavity are mutually attached. The partition is located inside the hollow cavity of the inner mold cavity, and the partition is parallel to the bottom plate. The partition is fixedly connected to the periphery of the hollow cavity of the inner mold cavity, and a cavity is formed between the partition and the bottom plate, and the air bag is located in the cavity; The method for demoulding the inner mold of the precast concrete part comprises the following steps: S1, after the precast concrete part is formed, the inner mold of the precast concrete part and the precast concrete part are inverted, and after inversion, the airbag is inflated; S2. When the inflation reaches a certain pressure, the airbag expands, and the airbag punches the partition, and the partition drives the inner mold cavity to move downward, so that the inner mold cavity is separated from the bottom plate.

2. The method for demoulding an inner mold of a precast concrete part according to claim 1, characterized in that: The precast concrete inner mold further comprises a first vent pipe, and the first vent pipe is connected to the air bag; The method further includes inverting the precast concrete inner mold and the precast concrete part by hoisting, and after inversion, inflating the airbag through the first ventilation pipe.

3. The method for demoulding an inner mold of a precast concrete part according to claim 1, characterized in that: The precast concrete inner mold further includes a second vent pipe, which is communicated with the cavity; The method further includes inflating the airbag through the first vent tube while inflating the cavity through the second vent tube.

4. The method for demoulding an inner mold of a precast concrete part according to claim 3, characterized in that: The method also includes stopping inflation when the inflation pressure in the airbag reaches 1.5-2 tons, at which time the airbag punches the partition.

5. The method for demoulding an inner mold of a precast concrete part according to claim 4, characterized in that: The method further includes inverting the precast concrete part and the precast concrete part inner mold after the inner mold cavity is separated from the bottom plate, and separating the inner mold cavity together with the bottom plate from the precast concrete part by a hoisting device to complete the demoulding of the precast concrete part inner mold.

6. The method for demoulding an inner mold of a precast concrete part according to claim 3, characterized in that: The partition is provided with a plurality of through holes, each of which is provided with a sealing structure, one end of the first ventilation pipe is connected to the airbag through the through hole, and one end of the second ventilation pipe is communicated with the cavity through the through hole.

7. The method for demoulding an inner mold of a precast concrete part according to claim 1, characterized in that: The precast concrete inner mold also includes a support plate, which is arranged on a side of the partition away from the cavity and is spaced apart from the partition. A plurality of support plates are provided, and an elastic element is provided between the partition and the support plate. The elastic element is any one of a steel wire spring, a coil spring, an alloy spring, and a compression spring.

8. The method for demoulding an inner mold of a precast concrete part according to claim 7, characterized in that: The precast concrete inner mold also includes a spring bracket, one end of which is connected to the bottom plate, the spring bracket passes through the through hole on the partition, the other end of the spring bracket is connected to the support plate, the elastic element is sleeved on the spring bracket, and when the airbag is in a compressed state, the distance between the partition and the support plate is 7 to 10 cm.

9. The method for demoulding an inner mold of a precast concrete part according to claim 8, characterized in that: The number of the elastic elements, the number of the spring brackets and the number of the support plates are the same.

10. The method for demoulding an inner mold of a precast concrete part according to claim 1, characterized in that: The bottom plate is cut obliquely around four sides. When the precast concrete part is in the process of being formed, the bottom plate is located at the bottom of the inner mold cavity, and the bottom plate is in contact with the inner mold cavity. When the precast concrete part is in the process of being demoulded, the precast concrete part and the inner mold are inverted, the air bag expands, and the bottom plate is separated from the inner mold cavity.

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