A casting mold for step stairs

Abstract

The present invention provides a casting mold for a step staircase, which relates to the technical field of casting molds and includes a first outer mold, a second outer mold, and an inner mold. The two ends of the first outer mold and the second outer mold are detachably spliced, and the inner mold is detachably set on the inner walls of the first outer mold and the second outer mold. There are multiple inner molds, and the multiple inner molds are detachably spliced. A staircase structure is formed between the inner mold and the inner wall of the second outer mold. A bottom support is provided at the lower part of the interior of the first outer mold, and the side walls of the bottom support are sealed and assembled with the lower part of the inner wall of the second outer mold. A base is fixedly provided at the lower part of the first outer mold, and the lower part of the second outer mold is slidably assembled with the upper part of the base. A limiting mechanism is provided on the base, and the limiting mechanism is assembled and connected to the outer side of the lower part of the second outer mold. The present invention makes the surface of the inner mold smooth and flat by contacting the walking position of the stairs with the inner mold, thereby saving the staff the operation of cleaning the surface of the stairs in sequence.

Description

Technical Field

[0001] The invention relates to the technical field of casting moulds, in particular to a casting mould for a tread staircase. Background Art

[0002] Nowadays, house building technology is relatively mature, and in order to build houses simply and quickly, prefabricated buildings are usually used. Prefabricated buildings refer to transferring a large amount of on-site work in traditional construction methods to factories, processing and manufacturing building components and accessories (such as floors, wall panels, stairs, balconies, etc.), transporting them to the construction site, and assembling and installing them on site through reliable connections. Prefabricated stairs are also produced in advance and transported to the construction site for assembly. In the existing technology, the production of stairs is usually completed by mold casting.

[0003] For example, a stair tread casting mold with the patent number "CN207211739U" belongs to the field of concrete mold technology. The utility model includes an inclined bottom plate, side plates and a plurality of step baffles for forming the vertical surface in front of the stair treads, at least two of the side plates are fixed on both sides of the bottom plate, and the side plates are provided with a plurality of first slots for plugging with the step baffles. The utility model provides a first slot on the side plate. When in use, after splicing the bottom plate and the side plate, the step baffle is inserted into the first slot to form a casting mold for the stair treads. The utility model is easy to use and greatly saves installation time. At the same time, the bottom plate, side plates and step baffles of this structure are easy to set in a standardized manner. There is no need to make various reinforcement structures on site. They can be used immediately after being taken. This greatly shortens the production time of the stair tread casting mold and improves construction efficiency.

[0004] In the above patent, when using a casting mold, after the mold is assembled, concrete is used to cast the mold surface. Since the top of the mold is an exposed structure, in order to prevent too much concrete from being poured, it is necessary to always observe whether the stair mold of the lowest level overflows. In order to ensure the quality of the cast stairs, the staff needs to check whether the concrete above each layer of the mold is just flat after pouring, and make corresponding additions and subtractions. During pouring, the concrete is poured from the top of the mold so that the concrete flows from top to bottom, so that the edge of the surface of each layer of the stairs is slightly raised after pouring. In order to ensure the quality of the stairs, the staff needs to use tools to smooth the surface of each layer of the stairs, which makes the casting operation more troublesome. At the same time, general molds can only be used for casting and producing stairs of the same size, which makes the scope of application relatively low. Summary of the Invention

[0005] The purpose of the present invention is to solve the problem in the prior art that in order to ensure the quality of the stairs, workers are required to use tools to smooth the surface of each floor of the stairs, which makes the casting operation more troublesome. At the same time, general molds can only be used to cast and produce stairs of the same size, which has a limited scope of application.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a step stair casting mold, comprising a first outer mold, a second outer mold and an inner mold, the two ends of the first outer mold and the second outer mold are detachably spliced, the inner mold is detachably set on the inner walls of the first outer mold and the second outer mold, there are multiple inner molds, and the multiple inner molds are detachably spliced, and a staircase structure is formed between the inner mold and the inner wall of the second outer mold, a bottom support is provided at the lower part of the first outer mold, and the side wall of the bottom support is sealed and assembled with the lower part of the inner wall of the second outer mold, a base is fixedly provided at the lower part of the first outer mold, and the lower part of the second outer mold is slidably assembled with the upper part of the base, a limiting mechanism is provided on the base, and the limiting mechanism is assembled with the outer side of the lower part of the second outer mold.

[0007] As a preferred embodiment, a fixing frame is provided above one side of the base, the outer wall of the first outer mold is assembled and connected to the fixing frame, a slide rail is provided on the base, and the second outer mold is slidably arranged with the slide rail through a limiting mechanism below. The outer wall of the first outer mold can be supported by the setting fixing frame to ensure its stability on the base, and the setting slide rail facilitates the movement operation of the second outer mold on the base, and the setting limiting mechanism facilitates the splitting and positioning operations of the second outer mold.

[0008] As a preferred embodiment, the limiting mechanism includes a screw rod, a slider and a limiting frame, the slider is arranged below the limiting frame, the slider is slidably arranged in the slide rail, the screw rod is rotatably arranged inside the slide rail, one end of the screw rod is threadedly rotatably arranged at the center position of the slider and extends outward, the limiting frame is assembled and connected to the outer wall of the second outer mold, and by driving and rotating the end of the screw rod arranged outside, the screw rod is driven to rotate, and then the slider is driven to slide in the slide rail, driving the second outer mold to move in the corresponding direction.

[0009] As a preferred embodiment, the structure of the outer mold is that the first outer mold has the same external structure as the second outer mold, and the outer walls of the first outer mold and the second outer mold are provided with transverse reinforcement ribs and longitudinal reinforcement ribs, and the transverse reinforcement ribs and the longitudinal reinforcement ribs are arranged perpendicular to each other. By setting the transverse reinforcement ribs and longitudinal reinforcement ribs, the overall strength of the first outer mold and the second outer mold is increased, so that the support force of the limiting mechanism on the second outer mold is more uniform.

[0010] As a preferred embodiment, the two ends of the first outer mold are clamped and set on the outside of the end face of the second outer mold, and mounting blocks are provided on the outside of the two ends of the second outer mold. The end face of the first outer mold is provided with a connecting block, and a long screw is rotatably provided in the connecting block. The end of the long screw away from the connecting block is clamped and set in the mounting block, and one end of the long screw extends out of the mounting block. The end of the long screw set on the outside is threadedly rotated and provided with a fastening nut. When splicing the first outer mold and the second outer mold, the long screw on the connecting block is rotated to the mounting block, and one end of the long screw is clamped and set at the center position inside the mounting block, and the end of the long screw set on the outside is threadedly connected by the fastening nut until the fastening nut is squeezed and contacted with the outer side of the mounting block.

[0011] As a preferred embodiment, the connecting block and the mounting block are a group of fasteners, and there are a total of multiple groups of fasteners. A locking mechanism is provided between adjacent fasteners, and the locking mechanism includes a locking block and a locking groove. The locking block is arranged on the outside of the second outer mold end face, and the locking groove is arranged on the outside of the first outer mold end face. The locking block is arranged on the outside of the second outer mold end face, and the locking block and the locking groove are assembled in a locking manner. By arranging mutually locking locking blocks and locking grooves between the end faces of the first outer mold and the second outer mold, it is convenient to limit the upper and lower positions between the first outer mold and the second outer mold, prevent displacement of the upper and lower positions, and ensure the sealing of the inner wall.

[0012] As a preferred embodiment, the inner mold is a right-angle structure, and the adjacent inner molds are vertically assembled and connected. The edge position of the inner mold is detachably assembled and connected to the first outer mold. A slide groove is provided at one end of the inner mold, and a slide bar is provided at the other end of the inner mold to slide up and down and engage with the slide groove. The up and down sliding engagement of the slide groove and the slide bar facilitates stable splicing between two adjacent inner molds, and the detachable assembly between the inner mold and the first outer mold facilitates installation between the inner mold and the first outer mold.

[0013] As a preferred embodiment, an assembly plate is provided on the end face of the inner mold, and a plurality of assembly grooves are provided on the inner side of the first outer mold. The assembly grooves are engaged and assembled with the assembly plate. A first bolt is provided on the assembly plate, and one end of the first bolt passes through the first outer mold from the outside of the first outer mold and is threadedly assembled with the assembly plate. The assembly groove is engaged with the assembly plate, so that the assembly plate can be limited. By selecting different inner molds, it is convenient to install them in assembly grooves at different positions according to the positions of different inner molds. After the assembly plate is assembled, the assembly plate and the first outer mold can be fixed by using the first bolt.

[0014] As a preferred embodiment, an end mold is provided at one end of the inner mold, and the two ends of the end mold are respectively assembled and connected to the inner mold and the second outer mold located at the edge. The assembly structure between the end mold and the inner mold is the same as the splicing structure between adjacent inner molds, and the assembly structure between the end mold and the second outer mold is the same as the assembly structure between the inner mold and the first outer mold. The provision of the end mold facilitates edge sealing operations between the inner mold and the second outer mold.

[0015] As a preferred embodiment, a top plate is provided at the upper end of the inner mold, a cylinder is provided on the bottom support directly below the top plate, and a spring is provided at the upper end of the cylinder. Through the cooperation between the top plate and the cylinder, when disassembling the inner mold, the first bolt can be removed first, and then the cylinder can be extended to push the top plate upward, thereby driving the inner mold to separate upward. Through the provided spring, after the cylinder stops pushing, the force released after the spring is squeezed can push the top plate upward for a distance.

[0016] Compared with the prior art, the advantages and positive effects of the present invention are:

[0017] 1. In the present invention, since the upper part of the casting space is the side of the stairs, the slight unevenness of the side of the stairs does not affect the overall beauty of the stairs, and the walking position of the stairs is in contact with the inner mold, and the surface of the inner mold is smooth and flat, thus saving the staff the operation of cleaning the surface of the stairs in sequence.

[0018] 2. The inner mold size of the present invention is replaceable, which is convenient for use in stairs with steps of different widths and heights under the same length and width, and is convenient for workers to use the same mold to produce different stairs.

[0019] 3. The present invention cooperates with the top plate and the cylinder. When disassembling the inner mold, the first bolt can be removed first, and then the cylinder can be extended to push the top plate upward, thereby driving the inner mold to separate upward.

[0020] 4. The present invention facilitates the tight connection between the first outer mold and the second outer mold through the cooperation of the limiting mechanism, the locking mechanism and the fasteners, thereby avoiding the situation of pouring leakage, and facilitating the disassembly between the first outer mold and the second outer mold, thereby achieving the demoulding effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A three-dimensional diagram of a casting mold for a staircase provided by the present invention;

[0022] Figure 2 A schematic diagram of the separation of a first outer mold and a second outer mold of a step stair casting mold provided by the present invention;

[0023] Figure 3 A schematic diagram of the base of a casting mold for a stair tread provided by the present invention;

[0024] Figure 4 A schematic diagram of a first outer mold of a step stair casting mold provided by the present invention;

[0025] Figure 5 A schematic diagram of a second outer mold of a step stair casting mold provided by the present invention;

[0026] Figure 6 A schematic diagram of the interior of a first outer mold of a step stair casting mold provided by the present invention;

[0027] Figure 7 A schematic diagram of an inner mold of a tread stair casting mold provided by the present invention;

[0028] Figure 8 A schematic diagram of the splitting of the inner mold and end mold of a tread stair casting mold provided by the present invention;

[0029] Figure 9 A schematic diagram of the assembly of fasteners for a tread stair casting mold provided by the present invention;

[0030] Figure 10 A schematic diagram of the separation of fasteners of a tread stair casting mold provided by the present invention.

[0031] Legend:

[0032] 1. First outer mold; 2. Second outer mold; 3. Inner mold; 4. Bottom support; 5. Base; 6. Fixed frame; 7. Slide rail; 801. Screw rod; 802. Slider; 803. Limiting frame; 901. Horizontal reinforcement rib; 902. Longitudinal reinforcement rib; 111. Mounting block; 112. Connecting block; 113. Long screw; 114. Fastening nut; 121. Engaging block; 122. Engaging groove; 131. Slide groove; 132. Slide bar; 141. Assembly plate; 142. Assembly groove; 143. First bolt; 15. End mold; 161. Top plate; 162. Cylinder; 163. Spring. DETAILED DESCRIPTION

[0033] The following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0034] See also Figure 1-10The present invention provides a technical solution: a step stair casting mold, comprising a first outer mold 1, a second outer mold 2 and an inner mold 3, the first outer mold 1 and the second outer mold 2 are detachably spliced ​​at both ends, the inner mold 3 is detachably arranged on the inner walls of the first outer mold 1 and the second outer mold 2, a plurality of inner molds 3 are provided, and the plurality of inner molds 3 are detachably spliced, and a stair structure is formed between the inner mold 3 and the inner wall of the second outer mold 2, a bottom support 4 is provided at the lower part of the first outer mold 1, and the side wall of the bottom support 4 is sealed and assembled with the lower part of the inner wall of the second outer mold 2, a base 5 is fixedly provided at the lower part of the first outer mold 1, and the lower part of the second outer mold 2 is slidably assembled with the upper part of the base 5, a limiting mechanism is provided on the base 5, and the limiting mechanism is assembled and connected to the outer side of the lower part of the second outer mold 2.

[0035] like Figure 1-10 As shown, a fixing frame 6 is provided above one side of the base 5, the outer wall of the first outer mold 1 is assembled and connected to the fixing frame 6, a slide rail 7 is provided on the base 5, and the second outer mold 2 is slidably arranged with the slide rail 7 through a limiting mechanism below. The outer wall of the first outer mold 1 can be supported by the setting fixing frame 6 to ensure its stability on the base 5, and the setting slide rail 7 facilitates the movement operation of the second outer mold 2 on the base 5, and the setting limiting mechanism facilitates the splitting and positioning operations of the second outer mold 2.

[0036] like Figure 1-10 As shown, the limiting mechanism includes a screw rod 801, a slider 802 and a limiting frame 803. The slider 802 is arranged below the limiting frame 803. The slider 802 is slidably arranged in the slide rail 7. The screw rod 801 is rotatably arranged inside the slide rail 7. One end of the screw rod 801 is threadedly rotatably arranged at the center position of the slider 802 and extends outward. The limiting frame 803 is assembled and connected to the outer wall of the second outer mold 2. By driving and rotating the end of the screw rod 801 set on the outside, the screw rod 801 is driven to rotate, and then the slider 802 is driven to slide in the slide rail 7, and the second outer mold 2 is driven to move in the corresponding direction.

[0037] like Figure 1-10 As shown, the structure of the outer mold is that the first outer mold 1 has the same external structure as the second outer mold 2. The outer walls of the first outer mold 1 and the second outer mold 2 are provided with transverse reinforcing ribs 901 and longitudinal reinforcing ribs 902. The transverse reinforcing ribs 901 and the longitudinal reinforcing ribs 902 are arranged perpendicular to each other. By setting the transverse reinforcing ribs 901 and the longitudinal reinforcing ribs 902, the overall strength of the first outer mold 1 and the second outer mold 2 is increased, so that the supporting force of the limiting mechanism on the second outer mold 2 is more uniform.

[0038] like Figure 1-10As shown, the two ends of the first outer mold 1 are snap-fitted to the outside of the end face of the second outer mold 2, and mounting blocks 111 are provided on the outside of the two ends of the second outer mold 2. The end face of the first outer mold 1 is provided with a connecting block 112, and a long screw 113 is rotated in the connecting block 112. The end of the long screw 113 away from the connecting block 112 is snap-fitted in the mounting block 111, and one end of the long screw 113 extends out of the mounting block 111. A fastening nut 114 is threadedly rotated at the end of the long screw 113 set on the outside. When splicing the first outer mold 1 and the second outer mold 2, the long screw 113 on the connecting block 112 is rotated to the mounting block 111, and one end of the long screw 113 is snap-fitted and set at the center position inside the mounting block 111, and the end of the long screw 113 set on the outside is threadedly connected by the fastening nut 114 until the fastening nut 114 is squeezed and contacted with the outer side of the mounting block 111.

[0039] like Figure 1-10 As shown, the connecting block 112 and the mounting block 111 are a group of fasteners, and there are multiple groups of fasteners. A locking mechanism is provided between adjacent fasteners, and the locking mechanism includes a locking block 121 and a locking groove 122. The locking block 121 is arranged on the outer side of the end face of the second outer mold 2, and the locking groove 122 is arranged on the outer side of the end face of the first outer mold 1. The locking block 121 is arranged on the outer side of the end face of the second outer mold 2, and the locking block 121 and the locking groove 122 are engaged and assembled. By arranging the mutually engaged locking block 121 and the locking groove 122 between the end faces of the first outer mold 1 and the second outer mold 2, it is convenient to limit the upper and lower positions between the first outer mold 1 and the second outer mold 2, prevent displacement of the upper and lower positions, and ensure the sealing of the inner wall.

[0040] like Figure 1-10 As shown, the inner mold 3 is a right-angle structure, and the adjacent inner molds 3 are vertically assembled and connected. The edge position of the inner mold 3 is detachably assembled and connected to the first outer mold 1. A slide groove 131 is provided at one end of the inner mold 3, and a slide bar 132 is provided at the other end of the inner mold 3 to slide up and down and engage with the slide groove 131. The up and down sliding engagement of the slide groove 131 and the slide bar 132 facilitates stable splicing between two adjacent inner molds 3, and the detachable assembly between the inner mold 3 and the first outer mold 1 facilitates installation between the inner mold 3 and the first outer mold 1.

[0041] like Figure 1-10As shown, an assembly plate 141 is provided on the end face of the inner mold 3, and a plurality of assembly grooves 142 are provided on the inner side of the first outer mold 1. The assembly grooves 142 are engaged and assembled with the assembly plate 141. A first bolt 143 is provided on the assembly plate 141. One end of the first bolt 143 passes through the first outer mold 1 from the outer thread of the first outer mold 1 and is threadedly assembled with the assembly plate 141. The engagement of the assembly groove 142 with the assembly plate 141 facilitates the positioning of the assembly plate 141. By selecting different inner molds 3, it is convenient to install them in the assembly grooves 142 at different positions according to the positions of different inner molds 3. After the assembly plate 141 is assembled, the first bolt 143 can be used to fix the assembly plate 141 and the first outer mold 1.

[0042] like Figure 1-10 As shown, an end mold 15 is provided at one end of the inner mold 3, and the two ends of the end mold 15 are respectively assembled and connected with the inner mold 3 and the second outer mold 2 located at the edge. The assembly structure of the end mold 15 and the inner mold 3 is the same as the splicing structure between adjacent inner molds 3, and the assembly structure of the end mold 15 and the second outer mold 2 is the same as the assembly structure of the inner mold 3 and the first outer mold 1. The provision of the end mold 15 facilitates the edge sealing operation between the inner mold 3 and the second outer mold 2.

[0043] like Figure 1-10 As shown, a top plate 161 is provided at the upper end of the inner mold 3, and a cylinder 162 is provided on the bottom support 4 just below the top plate 161. A spring 163 is provided at the upper end of the cylinder 162. Through the cooperation between the top plate 161 and the cylinder 162, when disassembling the inner mold 3, the first bolt 143 can be removed first, and then the cylinder 162 can be extended to push the top plate 161 upward, thereby driving the inner mold 3 to separate upward. Through the provided spring 163, after the cylinder 162 stops pushing, the force released after the spring 163 is squeezed can push the top plate 161 upward for a distance.

[0044] Working principle: When splicing the pouring formwork, the limiting mechanism can be adjusted to make the second outer formwork 2 slide on the base 5, so that the first outer formwork 1 and the second outer formwork 2 are separated. After separation, the appropriate inner formwork 3 is selected according to the required stair size, and multiple inner formworks 3 are spliced ​​together, and then the spliced ​​inner formwork 3 is assembled and connected to the inner wall of the first outer formwork 1 as a whole, and the bottom of the inner formwork 3 as a whole is tightly fitted with the top of the bottom support 4 to prevent concrete leakage during pouring, and then the second outer formwork 2 is slid on the base 5, and through the cooperation of the limiting mechanism, the first outer formwork 1 and the second outer formwork 2 are tightly squeezed and contacted, so that the bottom support 4 and the second outer formwork 2 are tightly fitted, and the first outer formwork 1 is tightly pressed. The mold 1 and the second outer mold 2 are assembled and fixed at both ends to prevent leakage. At this time, a horizontally laid-down staircase structure is formed between the second outer mold 2 and the inner mold 3. At this time, steel bars can be put into the space and concrete can be poured. After the pouring is completed, the cooling and shaping stage can be entered. Since the upper side of the pouring space is the side of the stairs, the slight unevenness of the side of the stairs does not affect the overall beauty of the stairs, and the walking position of the stairs is in contact with the inner mold 3. The surface of the inner mold 3 is smooth and flat, thus saving the staff the operation of cleaning the surface of the stairs in sequence. At the same time, the size of the inner mold 3 is replaceable, which is convenient for use in stairs with different widths and heights under the same length and width, and convenient for staff to use the same mold to produce different stairs.

[0045] The above description is merely a preferred embodiment of the present invention and does not constitute any other form of limitation to the present invention. Any person skilled in the art may utilize the technical contents disclosed above to change or modify them into equivalent embodiments with equivalent changes for application in other fields. However, any simple modification, equivalent change, and modification of the above embodiments made in accordance with the technical essence of the present invention without departing from the technical solution of the present invention shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A casting mold for step stairs, characterized in that: The invention comprises a first outer mold (1), a second outer mold (2) and an inner mold (3), wherein the two ends of the first outer mold (1) and the second outer mold (2) are detachably spliced, the inner mold (3) is detachably arranged on the inner walls of the first outer mold (1) and the second outer mold (2), a plurality of inner molds (3) are provided, and the plurality of inner molds (3) are detachably spliced, a staircase structure is formed between the inner mold (3) and the inner wall of the second outer mold (2), a bottom support (4) is provided at the lower part of the first outer mold (1), the side wall of the bottom support (4) is sealed and assembled with the lower part of the inner wall of the second outer mold (2), a base (5) is fixedly provided at the lower part of the first outer mold (1), the lower part of the second outer mold (2) is slidably assembled with the upper part of the base (5), a limiting mechanism is provided on the base (5), and the limiting mechanism is assembled and connected with the outer side of the lower part of the second outer mold (2); The two ends of the first outer mold (1) are clamped and arranged on the outside of the end surface of the second outer mold (2), and the two ends of the second outer mold (2) are provided with mounting blocks (111) on the outside. The end surface of the first outer mold (1) is provided with a connecting block (112), and a long screw (113) is rotatably provided in the connecting block (112). One end of the long screw (113) away from the connecting block (112) is clamped and arranged in the mounting block (111), and one end of the long screw (113) extends out of the mounting block (111). The end of the long screw (113) arranged outside is threadedly rotatably provided with a fastening nut (114); The connecting block (112) and the mounting block (111) form a group of fasteners, and a plurality of groups of fasteners are provided. A snap-fit ​​mechanism is provided between adjacent fasteners, and the snap-fit ​​mechanism comprises a snap-fit ​​block (121) and a snap-fit ​​groove (122). The snap-fit ​​block (121) is provided on the outside of the end face of the second outer mold (2), and the snap-fit ​​groove (122) is provided on the outside of the end face of the first outer mold (1). The snap-fit ​​block (121) is provided on the outside of the end face of the second outer mold (2), and the snap-fit ​​block (121) and the snap-fit ​​groove (122) are snap-fitted and assembled. The inner mold (3) is in a right-angle structure, and adjacent inner molds (3) are vertically assembled and connected. The edge of the inner mold (3) is detachably assembled and connected to the first outer mold (1). One end of the inner mold (3) is provided with a slide groove (131), and the other end of the inner mold (3) is provided with a slide bar (132) that is slidably engaged with the slide groove (131) up and down. The end surface of the inner mold (3) is provided with an assembly plate (141), the inner side of the first outer mold (1) is provided with a plurality of assembly grooves (142), the assembly grooves (142) and the assembly plate (141) are engaged and assembled, and the assembly plate (141) is provided with a first bolt (143), one end of the first bolt (143) passes through the first outer mold (1) from the outside of the first outer mold (1) and is threadedly assembled with the assembly plate (141); An end mold (15) is provided at one end of the inner mold (3), and both ends of the end mold (15) are respectively assembled and connected with the inner mold (3) and the second outer mold (2) located at the edge. The assembly structure of the end mold (15) and the inner mold (3) is the same as the splicing structure between adjacent inner molds (3). The assembly structure of the end mold (15) and the second outer mold (2) is the same as the assembly structure of the inner mold (3) and the first outer mold (1). A top plate (161) is provided at the upper end of the inner mold (3).

2. A casting mold for staircase steps according to claim 1, characterized in that: A fixing frame (6) is provided above one side of the base (5); the outer wall of the first outer mold (1) is assembled and connected to the fixing frame (6); a slide rail (7) is provided on the base (5); and the second outer mold (2) is slidably arranged with the slide rail (7) through a limiting mechanism below.

3. A casting mold for staircase steps according to claim 2, characterized in that: The limiting mechanism comprises a screw rod (801), a slider (802) and a limiting frame (803), wherein the slider (802) is arranged below the limiting frame (803), the slider (802) is slidably arranged in the slide rail (7), the screw rod (801) is rotatably arranged inside the slide rail (7), one end of the screw rod (801) is threadedly rotatably arranged at the center position of the slider (802) and extends outward, and the limiting frame (803) is assembled and connected to the outer wall of the second outer mold (2).

4. A casting mold for staircase steps according to claim 3, characterized in that: The first outer mold (1) and the second outer mold (2) have the same external structure, and the outer walls of the first outer mold (1) and the second outer mold (2) are provided with transverse reinforcing ribs (901) and longitudinal reinforcing ribs (902), and the transverse reinforcing ribs (901) and the longitudinal reinforcing ribs (902) are arranged perpendicular to each other.

5. The casting mold for stair treads according to claim 1, characterized in that: A cylinder (162) is provided on the bottom support (4) directly below the top plate (161), and a spring (163) is provided at the upper end of the cylinder (162).

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