A mandrel structure for forming a cross hole

Abstract

The present invention provides a core shaft structure for forming a cross hole, including a plurality of longitudinal core shafts for forming a transverse through hole, each longitudinal core shaft is installed with a plurality of transverse core shafts that can be vertically extended and retracted relative to the longitudinal core shaft, the transverse core shafts on each longitudinal core shaft are arranged one by one and the length of the transverse core shaft is adapted to the spacing between two adjacent longitudinal core shafts to form a longitudinal through hole. When the present invention is cast, by moving the movable side plate, the transverse core shaft can be driven to extend out of the longitudinal core shaft, and when removing the mold, the movable side plate is moved in the opposite direction to drive the transverse core shaft to retract into the longitudinal core shaft, and the longitudinal core shaft is pulled out along the length direction of the longitudinal core shaft, and installation and disassembly are very convenient.

Description

Technical Field

[0001] The invention relates to the technical field of molds, and in particular to a core shaft structure for forming cross holes. Background Art

[0002] In existing construction, the formwork is usually installed first, and then concrete is poured on-site between the formworks to form the wall. The formwork is removed after the wall reaches a certain strength requirement. This construction method has many processes, a long construction period, and a huge workload for on-site assembly and removal of formworks. Moreover, a considerable portion of the removed formworks cannot be reused multiple times, resulting in material waste.

[0003] The Chinese patent number CN102581939A provides a prefabricated reinforced concrete hollow formwork with cross holes and its vertical formwork forming equipment, which is provided with vertical and horizontal channels that interpenetrate each other. Therefore, only a small amount of splicing and pouring between the boards is required at the construction site to build an integrated wall that meets the requirements, and there is no need to disassemble after construction, which greatly simplifies the construction process and significantly shortens the construction period. However, the mold parts of the hollow formwork are scattered, especially the core shaft structure. Generally, holes are opened in the horizontal and transverse core shafts respectively, and then the horizontal and transverse core shafts are inserted and installed. It often takes a lot of time to splice when in use, and manual construction is used, which has low production efficiency and unstable quality. Summary of the invention

[0004] The purpose of the present invention is to address the above deficiencies and provide an integrated core shaft structure, in which the transverse core shaft can be telescopically installed in the longitudinal core shaft. The shape of the core shaft can be switched by telescoping the transverse core shaft. The core shaft is easy to use and can greatly improve the production efficiency of the core shaft structure for forming cross holes.

[0005] The solution adopted by the present invention to solve the technical problem is: a core shaft structure for forming cross holes, including a plurality of longitudinal core shafts for forming longitudinal through holes, each longitudinal core shaft is equipped with a plurality of transverse core shafts that can be vertically extended and retracted relative to the longitudinal core shaft, the transverse core shafts on each longitudinal core shaft are arranged one by one and the length of the transverse core shaft is adapted to the spacing between two adjacent longitudinal core shafts to form a transverse through hole.

[0006] Furthermore, in order to facilitate demoulding and reduce the difficulty of core pulling of the longitudinal core shaft, the longitudinal core shaft includes a tapered section, and the two ends of the tapered section are respectively formed with a small diameter end and a large diameter end, and the shaft diameter of the tapered section gradually increases from the small diameter end to the large diameter end.

[0007] Furthermore, in order to facilitate the setting of sealing structures at both ends of the longitudinal core shaft and ensure smooth connection with the tapered section; the longitudinal core shaft also includes a first straight section and a second straight section with equal axial diameters, the first straight section and the second straight section are respectively connected to the small diameter end and the large diameter end, and the axial diameter of the first straight section is equal to the axial diameter of the small diameter end, and the axial diameter of the second straight section is equal to the axial diameter of the large diameter end.

[0008] Furthermore, in order to form a cavity for accommodating the transverse core shaft, a retractable design of the transverse core shaft is realized; the longitudinal core shaft is composed of three fixed side plates and one movable side plate, a hollow hole is formed in the middle of the three fixed side plates and the movable side plate, the three fixed side plates are fixedly connected, the movable side plate is movably connected to two adjacent fixed side plates and the movable side plate can move in the hollow hole.

[0009] Furthermore, in order to control the synchronous extension and retraction of the transverse core shaft within the same longitudinal core shaft to improve efficiency and ensure that the transverse core shaft can be completely retracted into the hollow hole to avoid interference from the transverse core shaft when the longitudinal core shaft is extracted; the transverse core shaft is fixedly arranged on the movable side plate, and the sum of the length of the transverse core shaft and the thickness of the movable side plate is adapted to the transverse aperture of the hollow hole.

[0010] Furthermore, in order to facilitate the movement of the movable side plate to drive the multiple transverse core shafts to extend and retract, both ends of the movable side plate are provided with a paddle extending out of the hollow hole, and the width of the paddle is smaller than the width of the movable side plate.

[0011] Furthermore, in order to prevent dust from entering the hollow hole, end covers are provided at both ends of the longitudinal core shaft.

[0012] Furthermore, in order to install the end cover; both ends of the two oppositely arranged fixed side panels among the three fixed side panels are provided with mounting flanges for installing the end cover, the mounting flanges are extended vertically inward from the end of the fixed side panel, and a gap adapted to the width of the paddle is formed between the mounting flanges on the two oppositely arranged fixed side panels.

[0013] Furthermore, in order to facilitate the movement of the movable side plate, a limiting square hole is provided on the end cover, and the paddles at both ends of the movable side plate respectively pass through the limiting square holes at both ends.

[0014] Furthermore, in order to prevent the movable side panel from moving out of the hollow hole and ensure that the outer surface of the movable side panel is fitted with the fixed side panel to form a complete side; the paddle includes a first sheet connected to the movable side panel and a second sheet connected to the other side of the first sheet, the thickness of the first sheet is adapted to the thickness of the movable side panel, the thickness of the second sheet is less than the thickness of the first sheet to form a step groove close to the side of the transverse core axis, the depth of the step groove is adapted to the distance from the wall of the limiting square hole on the side of the end cover close to the longitudinal core axis to the edge of the end cover.

[0015] Compared with the prior art, the present invention has the following advantages: the present invention forms an integrated structure of the transverse mandrel and the longitudinal mandrel by telescopically installing the transverse mandrel in the longitudinal mandrel, thereby preventing the components from being dispersed, causing inconvenience in splicing and the inability to ensure accuracy; at the same time, during splicing, only the longitudinal mandrel needs to be arranged, and there is no need to drill holes in the longitudinal mandrel and the transverse mandrel like the traditional mandrel structure, and then insert the transverse mandrel into the hole of the longitudinal mandrel respectively, which is troublesome to operate and inefficient; and during casting, the present invention can be brought along by moving the movable side plate The movable transverse mandrel extends out of the longitudinal mandrel. When removing the mold, the movable side plate is moved in the opposite direction to drive the transverse mandrel to retract into the longitudinal mandrel, and the longitudinal mandrel is pulled out along the length direction of the longitudinal mandrel. The installation and disassembly are very convenient, and the straight sections at both ends of the longitudinal mandrel are convenient for installing the sealing structure, and the middle tapered section is convenient for demolding. In order to facilitate the moving of the movable side plate, paddles extending out of the hollow hole are arranged on both sides of the movable side plate, and the limiting square holes on both sides of the longitudinal mandrel can limit the movable range of the paddle to prevent the movable side plate from falling out of the hollow hole, thereby ensuring the connectivity of the overall structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below with reference to the accompanying drawings in conjunction with embodiments:

[0017] Figure 1 It is a structural schematic diagram of the present invention;

[0018] Figure 2 It is a schematic diagram of the structure of a single longitudinal mandrel;

[0019] Figure 3 It is a structural diagram of the connection between the longitudinal mandrel and the transverse mandrel;

[0020] Figure 4 It is a structural diagram of the connection between the movable side plate and the transverse mandrel;

[0021] Figure 5 This is a connection structure diagram of three fixed side panels.

[0022] In the figure: 1-longitudinal mandrel; 11-first straight section; 12-tapered section; 121-large diameter end; 122-small diameter end; 13-second straight section; 14-fixed side plate; 141-mounting flange; 15-movable side plate; 16-hollow hole; 2-end cover; 21-limiting square hole; 3-transverse mandrel; 4-paddle; 41-first sheet; 42-second sheet. DETAILED DESCRIPTION

[0023] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments:

[0024] like Figure 1-5As shown, this embodiment provides a core shaft structure for forming cross holes, including a plurality of longitudinal core shafts 1 for forming longitudinal through holes, each longitudinal core shaft 1 is installed with a plurality of transverse core shafts 3 which can be vertically extended and retracted relative to the longitudinal core shaft 1, the transverse core shafts 3 on each longitudinal core shaft 1 are arranged one by one and the length of the transverse core shaft 3 is adapted to the spacing between two adjacent longitudinal core shafts 1 to form a transverse through hole, wherein the longitudinal core shaft 1 and the transverse core shaft 3 are arranged at equal spacings, and the shapes of the longitudinal core shaft 1 and the transverse core shaft 3 can be set as needed.

[0025] In this embodiment, in order to facilitate demolding and reduce the difficulty of core pulling of the longitudinal core shaft 1, the longitudinal core shaft 1 includes a tapered section 12, and the two ends of the tapered section 12 are respectively formed with a small diameter end 122 and a large diameter end 121, and the shaft diameter of the tapered section 12 gradually increases from the small diameter end 122 to the large diameter end 121.

[0026] In this embodiment, in order to facilitate the setting of sealing structures at both ends of the longitudinal core shaft 1 and ensure smooth connection with the tapered section 12; the longitudinal core shaft 1 also includes a first straight section 11 and a second straight section 13 of equal axial diameters, the first straight section 11 and the second straight section 13 are respectively connected to the small diameter end 122 and the large diameter end 121, and the axial diameter of the first straight section 11 is equal to the axial diameter of the small diameter end 122, and the axial diameter of the second straight section 13 is equal to the axial diameter of the large diameter end 121.

[0027] In this embodiment, in order to form a cavity for accommodating the transverse core shaft 3, a retractable design of the transverse core shaft 3 is realized; the longitudinal core shaft 1 is composed of three fixed side plates 14 and one movable side plate 15, and a hollow hole 16 is formed in the middle of the three fixed side plates 14 and the movable side plate 15. The three fixed side plates 14 are fixedly connected to each other, and the movable side plate 15 is movably connected to two adjacent fixed side plates 14 and the movable side plate 15 can move in the hollow hole 16.

[0028] In this embodiment, in order to control the synchronous extension and retraction of the transverse core shaft 3 in the same longitudinal core shaft 1 to improve efficiency and ensure that the transverse core shaft 3 can be completely retracted into the hollow hole 16 to avoid interference from the transverse core shaft 3 when the longitudinal core shaft 1 is extracted; the transverse core shaft 3 is fixedly arranged on the movable side plate 15, and the sum of the length of the transverse core shaft 3 and the thickness of the movable side plate 15 is adapted to the transverse aperture of the hollow hole 16.

[0029] In this embodiment, in order to facilitate the movement of the movable side plate 15 to drive the multiple transverse core shafts 3 to extend and retract, both ends of the movable side plate 15 are provided with a paddle 4 extending out of the hollow hole 16 , and the width of the paddle 4 is smaller than the width of the movable side plate 15 .

[0030] In this embodiment, in order to prevent dust from entering the hollow hole 16, end covers 2 are provided at both ends of the longitudinal core shaft 1, one of the end covers 2 is a fixed end cover 2 fixedly connected to the longitudinal core shaft 1, and the other end cover 2 is movably connected to the longitudinal core shaft 1 by screws.

[0031] In this embodiment, in order to install the end cover 2, both ends of two oppositely arranged fixed side panels 14 among the three fixed side panels 14 are provided with mounting flanges 141 for mounting the end cover 2, and the mounting flanges 141 are vertically extended inward from the ends of the fixed side panels 14, and a gap adapted to the width of the paddle 4 is formed between the mounting flanges 141 on the two oppositely arranged fixed side panels 14.

[0032] In this embodiment, in order to facilitate the movement of the movable side plate 15 , a limiting square hole 21 is provided on the end cover 2 , and the paddles 4 at both ends of the movable side plate 15 pass through the limiting square holes 21 at both ends respectively.

[0033] In this embodiment, in order to prevent the movable side plate 15 from moving out of the hollow hole 16 and ensure that the outer surface of the movable side plate 15 fits with the fixed side plate 14 to form a complete side; the paddle 4 includes a first sheet 41 connected to the movable side plate 15 and a second sheet 42 connected to the other side of the first sheet 41, the thickness of the first sheet 41 is adapted to the thickness of the movable side plate 15, the thickness of the second sheet 42 is less than the thickness of the first sheet 41 to form a step groove close to the side of the transverse core shaft 3, the depth of the step groove is adapted to the distance from the hole wall of the limiting square hole 21 on the side of the end cover 2 close to the longitudinal core shaft 1 to the edge of the end cover 2.

[0034] The present invention forms an integrated structure of the transverse mandrel 3 and the longitudinal mandrel 1 by telescopically installing the transverse mandrel 3 in the longitudinal mandrel 1, thereby preventing the components from being dispersed, causing inconvenience in splicing and the inability to ensure precision. At the same time, when splicing, it is only necessary to complete the layout of the longitudinal mandrel 1, and there is no need to open holes on the longitudinal mandrel 1 and the transverse mandrel 3 like the traditional mandrel structure, and then insert the transverse mandrel 3 into the hole of the longitudinal mandrel 1 respectively, which is troublesome to operate and inefficient. In addition, when casting, the present invention can drive the transverse mandrel 3 to extend out of the longitudinal mandrel 1 by moving the movable side plate 15, and remove the mold. When the movable side plate 15 is moved in the opposite direction, the transverse core shaft 3 is driven to retract into the longitudinal core shaft 1, and the longitudinal core shaft 1 is pulled out along the length direction of the longitudinal core shaft 1. The installation and disassembly are very convenient, and the straight sections at both ends of the longitudinal core shaft 1 are convenient for installing the sealing structure, and the middle tapered section 12 is convenient for demoulding. In order to facilitate the movement of the movable side plate 15, paddles 4 extending out of the hollow hole 16 are provided on both sides of the movable side plate 15, and the limiting square holes 21 on both sides of the longitudinal core shaft 1 can limit the movable range of the paddle 4 to prevent the movable side plate 15 from falling out of the hollow hole 16, thereby ensuring the connectivity of the overall structure.

[0035] The above descriptions are merely embodiments of the present invention, and are not intended to limit the patent protection scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention's specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A mandrel structure for forming a cross hole, characterized in that: It comprises a plurality of longitudinal core shafts for forming longitudinal through holes, each of which is provided with a plurality of transverse core shafts which can be vertically extended and retracted relative to the longitudinal core shaft, the transverse core shafts on each longitudinal core shaft are arranged one by one and the length of the transverse core shaft is adapted to the spacing between two adjacent longitudinal core shafts to form the transverse through holes, and the longitudinal core shafts and the transverse core shafts are arranged at equal spacings.

2. The mandrel structure for forming a cross hole according to claim 1, characterized in that: The longitudinal core shaft comprises a tapered section, and two ends of the tapered section are respectively formed with a small diameter end and a large diameter end, and the shaft diameter of the tapered section gradually increases from the small diameter end to the large diameter end.

3. The mandrel structure for forming a cross hole according to claim 2, characterized in that: The longitudinal core shaft also includes a first straight section and a second straight section of equal axial diameters, the first straight section and the second straight section are respectively connected to the small diameter end and the large diameter end, and the axial diameter of the first straight section is equal to the axial diameter of the small diameter end, and the axial diameter of the second straight section is equal to the axial diameter of the large diameter end.

4. The mandrel structure for forming a cross hole according to claim 3, characterized in that: The longitudinal core shaft is composed of three fixed side plates and one movable side plate, a hollow hole is formed in the middle of the three fixed side plates and the movable side plate, the three fixed side plates are fixedly connected to each other, the movable side plate is movably connected to two adjacent fixed side plates and the movable side plate can move in the hollow hole.

5. The mandrel structure for forming a cross hole according to claim 4, characterized in that: The transverse mandrel is fixedly arranged on the movable side plate, and the sum of the length of the transverse mandrel and the thickness of the movable side plate is adapted to the transverse aperture of the hollow hole.

6. The mandrel structure for forming a cross hole according to claim 5, characterized in that: Both ends of the movable side plate are provided with paddles extending out of the hollow hole, and the width of the paddles is smaller than the width of the movable side plate.

7. The mandrel structure for forming a cross hole according to claim 6, characterized in that: End covers are provided at both ends of the longitudinal core shaft.

8. The mandrel structure for forming a cross hole according to claim 7, characterized in that: Both ends of two oppositely arranged fixed side panels of the three fixed side panels are provided with mounting flanges for mounting end covers, the mounting flanges are vertically extended inwardly from the ends of the fixed side panels, and a gap adapted to the width of the paddle is formed between the mounting flanges on the two oppositely arranged fixed side panels.

9. The mandrel structure for forming a cross hole according to claim 8, characterized in that: The end cover is provided with a limiting square hole, and the paddles at both ends of the movable side plate respectively pass through the limiting square holes at the two ends.

10. The mandrel structure for forming a cross hole according to claim 9, characterized in that: The paddle includes a first sheet body connected to a movable side plate and a second sheet body connected to the other side of the first sheet body, the thickness of the first sheet body is adapted to the thickness of the movable side plate, the thickness of the second sheet body is smaller than the thickness of the first sheet body to form a step groove close to the side of the transverse core axis, and the depth of the step groove is adapted to the distance from the wall of the limiting square hole on the side of the end cover close to the longitudinal core axis to the edge of the end cover.

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