Slurry leakage prevention device for box connection, installation and pre-burying of junction box

Abstract

The invention discloses a slurry leakage prevention device for box connection, installation and pre-embedding of a junction box, which comprises a concrete layer, a junction box body is embedded in the concrete layer, one side of the junction box body is connected with a junction pipe, a rotating mechanism is arranged in the junction box body in a penetrating manner, one end of the rotating mechanism is connected with a pushing structure, and the other end of the rotating mechanism is connected with a slurry leakage prevention device. The rotating mechanism is sleeved with a blocking structure, one end of the pushing structure is connected with a closing mechanism, and the closing mechanism corresponds to the four side walls of the junction box body. The junction box not only can meet the use requirements of most rectangular junction boxes, but also can fully adapt to the pre-embedding requirements of special-shaped junction boxes, avoids traditional sawdust pollution, is convenient to clean, in addition, can greatly improve the protection effect of the junction box, further ensures the tightness and sufficiency of connection, enhances the strength and reduces the production cost. The compressive strength and the flame-retardant capability of the junction box are improved, and the stability and the firmness of the junction box after burying are effectively ensured.

Description

Technical Field

[0001] The invention relates to the technical field of pre-buried junction boxes, in particular to a slurry leakage prevention device for pre-buried junction boxes. Background Art

[0002] The junction box is a device used to fix the terminal block and serve as a connector. It protects the temperature sensing element from corrosion by the external atmosphere and ensures good contact between the external wires and the terminal. In addition to the ordinary junction box, splash-proof, waterproof and plug-in types are also designed according to the temperature object to be measured and the on-site environmental conditions and requirements.

[0003] At present, in the pre-buried operation of the junction box, it is necessary to seal it and then pour cement to prevent cement slurry from entering its interior. However, the existing method is to fill the interior with wood chips and sawdust and then seal it with a template. This method not only causes great pollution during dismantling, but also its internal support is unstable, which can easily cause damage to the shell. In addition, it cannot fully seal the box joint, which can easily cause cement slurry leakage. For this reason, we propose a leakage-proof slurry device for pre-buried junction box installation to solve the above problems. Summary of the Invention

[0004] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a slurry leakage prevention device for pre-embedded installation of a junction box.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A slurry leakage prevention device for pre-embedded installation of a junction box comprises a concrete layer, a junction box body is embedded in the concrete layer, a junction box body is connected to a junction tube on one side of the junction box body, a rotating mechanism is provided through the junction box body, one end of the rotating mechanism is connected to a pushing structure, a blocking structure is sleeved on the rotating mechanism, one end of the pushing structure is connected to a closing mechanism, and the closing mechanism corresponds to the four side walls of the junction box body.

[0007] Preferably, four mounting holes are provided on four side walls around the junction box body, movable blocks are connected in the mounting holes, one end of the wiring tube passes through one of the mounting holes and extends into the junction box body, and the wiring tube is buried in the concrete layer.

[0008] Preferably, one end of the wiring tube is connected to a closing head.

[0009] Preferably, the rotating mechanism comprises a stud penetrating one side of the junction box body, a rotating wheel is fixed to one end of the stud, a mounting block is provided at one end of the rotating wheel, and the stud is rotatably sleeved on the mounting block.

[0010] Preferably, the pushing structure comprises a moving block threadedly connected to the stud, and four connecting rods are rotatably connected to a side wall of the moving block at equal intervals.

[0011] Preferably, the blocking structure comprises a blocking plate provided through the stud, one end of the blocking plate abuts against one side of the junction box body.

[0012] Preferably, the closing mechanism includes a connecting block rotatably connected to one end of the stud, four support rods are rotatably connected to a circle of the connecting block at equal intervals, one end of a connecting rod on the same side is rotatably connected to one end of a support rod on the same side, a rotating rod is fixed to one side of the support rod, a closing plate is rotatably connected to the rotating rod, and a closing plate on the same side abuts against one side of the junction box body, and a rubber layer is coated on one side wall of the closing plate.

[0013] Preferably, the junction box body is made of modified polypropylene mixed with glass fiber.

[0014] Preferably, the junction box body is filled with water-soluble foam filler.

[0015] Preferably, a peripheral outer wall of the junction box body is coated with polyurethane foam gel.

[0016] In the present invention, when a conventional rectangular junction box is installed, a pushing structure and a closing mechanism are placed inside it, and its installation hole is fully blocked by the closing mechanism, and at the same time, it is firmly supported and closed. Then, a baffle is used to block the opening of the junction box body, and then cement is poured. Polyurethane foam gel is pre-coated on the contact surface between the bottom box and the concrete. It uses polyvinyl alcohol foam material, which expands when wet and fills micro gaps to achieve IP68 protection level. The junction box body uses modified polypropylene (PP) mixed with glass fiber, and its compressive strength is increased by 40%. It also has a flame retardant level of V0, which greatly improves the stability and firmness after burial and effectively avoids leakage of cement slurry.

[0017] In the present invention, the modified polypropylene incorporating glass fibers has the following advantages: significantly improved mechanical properties, enhanced strength and rigidity, the addition of glass fibers increases the tensile strength of PP to 1174-3923 MPa (single filament strength), the flexural modulus increases by 3-4 times, and the impact resistance is optimized through interface modification (such as maleic anhydride grafting), the glass fibers are more tightly bonded to the PP matrix, the impact toughness is increased by more than 40%, the low-temperature brittleness problem is alleviated, the thermal properties are improved, and the heat resistance is enhanced. After glass fiber reinforcement, the heat deformation temperature (HDT) of PP is increased from about 60°C of pure PP to more than 150°C, and it can be used for a long time in a high-temperature environment, and the thermal expansion coefficient is reduced. The high modulus characteristics of the glass fibers reduce the thermal expansion coefficient of the composite material by 50%-70%, reducing deformation caused by temperature changes.

[0018] The present invention has the following advantages:

[0019] 1. By using water-soluble foam filler, it can be directly washed and dissolved by high-pressure water gun after pouring, avoiding traditional sawdust pollution and facilitating cleaning, fully meeting the needs of pre-buried special-shaped junction boxes;

[0020] 2. By pre-coating polyurethane foam gel on the contact surface between the bottom box and the concrete, it expands when wet and fills the micro gaps, greatly improving the protection effect, further ensuring the tightness and adequacy of the connection, and enhancing the strength;

[0021] 3. By using modified polypropylene mixed with glass fiber, the compressive strength and flame retardancy of the junction box are greatly improved, effectively ensuring its stability and firmness after burial;

[0022] 4. Through the combination of the pushing structure and the closing mechanism, the interior of the junction box can be more fully supported and limited, while ensuring the adequacy and tightness of the closure, meeting the use requirements of most rectangular junction boxes;

[0023] To sum up, the present invention can not only meet the use requirements of most rectangular junction boxes, but also fully adapt to the pre-embedding requirements of special-shaped junction boxes, avoid traditional sawdust pollution, and facilitate cleaning. In addition, it can greatly improve the protection effect of the junction box, further ensure the tightness and sufficiency of the connection, enhance the strength, improve the compressive strength and flame retardant ability of the junction box, and effectively ensure its stability and firmness after embedment. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural diagram of the present invention;

[0025] Figure 2 This is a diagram of the installation structure of the closing plate of the present invention;

[0026] Figure 3 This is a diagram of the interference structure between the baffle and the junction box body of the present invention;

[0027] Figure 4 This is a diagram of the support rod connection structure of the present invention;

[0028] Figure 5 This is a structural diagram of the junction box body of the present invention;

[0029] Figure 6 This is a diagram of the buried structure of the junction box body of the present invention;

[0030] Figure 7 This is a diagram showing the installation structure of the closing head of the present invention;

[0031] Figure 8 This is a diagram of the filling structure of the water-soluble foam filler of the present invention;

[0032] Figure 9 This is a diagram of the polyurethane foam gel coating structure of the present invention.

[0033] In the figure: 1 baffle, 2 support rod, 3 connecting block, 4 connecting rod, 5 closing plate, 6 mounting block, 7 stud, 8 rotating wheel, 9 movable card block, 10 junction box body, 11 moving block, 12 rotating rod, 13 concrete layer, 14 wiring tube, 15 closing head, 16 polyurethane foam gel, 17 water-soluble foam filler, 18 mounting hole. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0035] Example 1

[0036] Reference Figure 1-7 A slurry leakage prevention device for pre-embedded installation of a junction box comprises a concrete layer 13, in which a junction box body 10 is embedded. The junction box body 10 is made of modified polypropylene mixed with glass fiber. The modified polypropylene mixed with glass fiber has the following advantages: significantly improved mechanical properties, enhanced strength and rigidity, the addition of glass fiber increases the tensile strength of PP to 1174-3923 MPa (single filament strength), increases the flexural modulus by 3-4 times, and optimizes impact resistance. Through interface modification (such as maleic anhydride grafting), the glass fiber and the PP matrix are more tightly bonded, the impact toughness is increased by more than 40%, the low-temperature brittleness problem is alleviated, the thermal performance is improved, and the heat resistance is enhanced. After glass fiber reinforcement, the heat deformation temperature (HDT) of PP is increased from about 60°C of pure PP to more than 150°C, which can be used for a long time in a high temperature environment, and the thermal expansion coefficient is reduced. The high modulus characteristics of glass fiber reduce the thermal expansion coefficient of the composite material by 50%-70%, reducing deformation caused by temperature changes;

[0037] A wiring tube 14 is connected to one side of the junction box body 10, and a closing head 15 is connected to one end of the wiring tube 14. The closing head 15 seals and protects the wiring inside the junction box body 10 to prevent the wiring inside the wiring tube from being damaged.

[0038] A rotating mechanism is provided through the junction box body 10. The rotating mechanism includes a stud 7 that passes through one side of the junction box body 10. A rotating wheel 8 is fixed to one end of the stud 7. A mounting block 6 is provided at one end of the rotating wheel 8. The stud 7 is rotatably sleeved on the mounting block 6. The stud 7 is rotated by rotating the rotating wheel 8, thereby realizing the movement of the driving structure.

[0039] One end of the rotating mechanism is connected to a pushing structure, which includes a moving block 11 threadedly screwed on the stud 7. Four connecting rods 4 are rotatably connected to the side walls of the moving block 11 at equal intervals. The rotation of the stud 7 drives the moving block 11 to move, thereby realizing the adjustment of the closing mechanism.

[0040] A blocking structure is sleeved on the rotating mechanism. The blocking structure includes a baffle 1 that is arranged on the stud 7. One end of the baffle 1 abuts against one side of the junction box body 10. The baffle 1 closes and blocks the open end of the junction box body 10 to achieve sufficient protection.

[0041] One end of the pushing structure is connected to a closing mechanism, which includes a connecting block 3 rotatably connected to one end of the stud 7, four support rods 2 rotatably connected around the connecting block 3 at equal intervals, one end of a connecting rod 4 on the same side is rotatably connected to one end of a support rod 2 on the same side, a rotating rod 12 is fixed to one side of the support rod 2, a closing plate 5 is rotatably connected to the rotating rod 12, and a closing plate 5 on the same side abuts against one side of the junction box body 10, a side wall of the closing plate 5 is covered with a rubber layer, and the angle of the support rod 2 is adjusted by moving the connecting rod 4, thereby achieving the abutting support of the closing plate 5 on the side wall of the junction box body 10, and at the same time fully sealing the mounting hole 18 for leak-proof treatment;

[0042] The closing mechanism corresponds to the four side walls of the junction box body 10. Four mounting holes 18 are provided on the four side walls of the junction box body 10. The movable card block 9 is connected to the mounting hole 18. One end of the wiring tube 14 passes through one of the mounting holes 18 and extends into the junction box body 10. The wiring tube 14 is buried in the concrete layer 13. The mounting hole 18 is used to connect with the wiring tube 14 to facilitate the wiring inside the wiring tube 14 to enter the junction box body 10.

[0043] Example 2

[0044] Reference Figure 8 The difference between Example 2 and Example 1 is that Example 3 also includes a water-soluble foam filler 17 filled in the junction box body 10, which is directly dissolved by high-pressure water gun washing after pouring, avoiding traditional sawdust pollution and facilitating cleaning, fully meeting the pre-buried requirements of special-shaped junction boxes.

[0045] In the present invention, the benefits of the water-soluble foam filler are:

[0046] 1. Biodegradability

[0047] It has good biodegradability and is made of water-soluble polymer materials such as polyvinyl alcohol (PVA). It can completely dissolve into carbon dioxide and water within 24 hours after coming into contact with water, reducing 99% of white pollution compared to traditional plastic foams.

[0048] It has no toxic release, does not contain harmful substances such as formaldehyde and benzene (the traditional foam glue curing process may release irritating gases), and meets the safety standards of food-grade packaging materials.

[0049] 2. Construction convenience

[0050] With fast removal technology, after concrete pouring, only high-pressure water gun washing is needed to dissolve the foam, saving 80% of cleaning time compared with traditional sawdust / plastic foam. According to experiments, it only takes 2 hours to remove 1,000 embedded boxes.

[0051] It has good adaptive filling ability, and the foam expansion coefficient is adjustable (range 1.5-3 times), which can accurately fill special-shaped junction boxes or packaging gaps, avoiding material waste caused by manual cutting.

[0052] 3. Labor costs

[0053] The labor cost is low, and the efficiency of the embedded process is increased by 50%, without the need for tape sealing or secondary cleaning.

[0054] 4. Functional extension advantages

[0055] Its materials are highly compatible and non-corrosive to metals, plastics, and concrete (passed pH neutrality test), making it suitable for multiple scenarios such as construction, metals, and cold chains.

[0056] Example 3

[0057] Reference Figure 9 The difference between the third embodiment and the first embodiment is that the third embodiment further comprises a polyurethane foam gel 16 coated on the outer wall of the junction box body 10, and a concrete layer 13, in which the junction box body 10 is buried. The junction box body 10 is made of modified polypropylene mixed with glass fiber. The modified polypropylene mixed with glass fiber has the following advantages: the mechanical properties are significantly improved, the strength and rigidity are enhanced, and the addition of glass fiber increases the tensile strength of PP to 1174-3923MPa (single fiber strength degree), the flexural modulus is increased by 3-4 times, and the impact resistance is optimized through interface modification (such as maleic anhydride grafting). The glass fiber and PP matrix are more tightly bonded, the impact toughness is increased by more than 40%, the low-temperature brittleness problem is alleviated, the thermal performance is improved, and the heat resistance is enhanced. The heat deformation temperature (HDT) of PP reinforced with glass fiber is increased from about 60°C of pure PP to more than 150°C. It can be used for a long time in a high temperature environment, and the thermal expansion coefficient is reduced. The high modulus characteristics of glass fiber reduce the thermal expansion coefficient of the composite material by 50%-70%, reducing deformation caused by temperature changes;

[0058] A wiring tube 14 is connected to one side of the junction box body 10, and a closing head 15 is connected to one end of the wiring tube 14. The closing head 15 seals and protects the wiring inside the junction box body 10 to prevent the wiring inside the wiring tube from being damaged.

[0059] A rotating mechanism is provided through the junction box body 10. The rotating mechanism includes a stud 7 that passes through one side of the junction box body 10. A rotating wheel 8 is fixed to one end of the stud 7. A mounting block 6 is provided at one end of the rotating wheel 8. The stud 7 is rotatably sleeved on the mounting block 6. The stud 7 is rotated by rotating the rotating wheel 8, thereby realizing the movement of the driving structure.

[0060] One end of the rotating mechanism is connected to a pushing structure, which includes a moving block 11 threadedly screwed on the stud 7. Four connecting rods 4 are rotatably connected to the side walls of the moving block 11 at equal intervals. The rotation of the stud 7 drives the moving block 11 to move, thereby realizing the adjustment of the closing mechanism.

[0061] A blocking structure is sleeved on the rotating mechanism. The blocking structure includes a baffle 1 that is arranged on the stud 7. One end of the baffle 1 abuts against one side of the junction box body 10. The baffle 1 closes and blocks the open end of the junction box body 10 to achieve sufficient protection.

[0062] One end of the pushing structure is connected to a closing mechanism, which includes a connecting block 3 rotatably connected to one end of the stud 7, four support rods 2 rotatably connected around the connecting block 3 at equal intervals, one end of a connecting rod 4 on the same side is rotatably connected to one end of a support rod 2 on the same side, a rotating rod 12 is fixed to one side of the support rod 2, a closing plate 5 is rotatably connected to the rotating rod 12, and a closing plate 5 on the same side abuts against one side of the junction box body 10, a side wall of the closing plate 5 is covered with a rubber layer, and the angle of the support rod 2 is adjusted by moving the connecting rod 4, thereby achieving the abutting support of the closing plate 5 on the side wall of the junction box body 10, and at the same time fully sealing the mounting hole 18 for leak-proof treatment;

[0063] The closing mechanism corresponds to the four side walls of the junction box body 10. Four mounting holes 18 are provided on the four side walls of the junction box body 10. The movable card block 9 is connected to the mounting hole 18. One end of the wiring tube 14 passes through one of the mounting holes 18 and extends into the junction box body 10. The wiring tube 14 is buried in the concrete layer 13. The mounting hole 18 is used to connect with the wiring tube 14 to facilitate the wiring inside the wiring tube 14 to enter the junction box body 10.

[0064] In the present invention, the benefits of polyurethane foaming gel are:

[0065] 1. Excellent physical properties

[0066] 1. Highly efficient thermal insulation, with a thermal conductivity as low as 0.025W / (m·K), which saves more than 25% energy compared to traditional insulation materials (such as EPS foam). It is particularly suitable for scenarios requiring precise temperature control, such as solar junction box packaging and cold chain equipment.

[0067] 2. Dynamic cushioning and shock resistance: after foaming, it forms an elastic closed-cell structure, which can absorb more than 90% of the impact energy, effectively protecting the safety of precision instruments and fragile items during transportation. Drop tests show that the product damage rate is reduced by 80%.

[0068] 3. Lightweight and space-saving, the volume before foaming is only 1 / 30 of that after foaming, which greatly reduces storage and transportation costs; the density after curing ranges from 20-200kg / m 3 , 40% lighter than similar materials.

[0069] 2. Chemical and Environmental Adaptability

[0070] 1. Good weather resistance and waterproof sealing, with a temperature range of -40℃ to 120℃ (up to 180℃ after modification), adaptable to extreme outdoor climates, with a closed cell rate of over 95%, a water absorption rate of less than 1%, and IP68 waterproof.

[0071] 2. Strong resistance to chemical corrosion, stable to media such as acid, alkali, and salt spray, and can resist erosion by 5% concentration acid and alkali solutions in chemical plant equipment packaging.

[0072] 3. Construction and Environmental Protection Advantages

[0073] 1. The construction is convenient and efficient, with on-site foaming and filling completed within 10 seconds, which is 5 times more efficient than the traditional filling process. It supports seamless covering of special-shaped spaces, such as the complex structure inside the solar junction box.

[0074] 2. Environmentally friendly and recyclable, in compliance with RoHS and REACH environmental standards. Some models use biodegradable materials. Waste can be crushed and used as building sound insulation layer, with a recycling rate of 60%.

[0075] In the present invention, when a conventional rectangular junction box is installed, a pushing structure and a closing mechanism are placed inside it, and the installation hole 18 is fully blocked by the closing mechanism, and at the same time, it is firmly supported and closed. Then, the opening of the junction box body 10 is blocked by the baffle 1, and then cement is poured. Polyurethane foam gel is pre-coated on the contact surface between the bottom box and the concrete. It uses polyvinyl alcohol foam material, which expands when wet and fills micro gaps to achieve IP68 protection level. The junction box body 10 uses modified polypropylene (PP) mixed with glass fiber, and the compressive strength is increased by 40%, and the flame retardancy reaches V0 level, which greatly improves the stability and firmness after burial and effectively avoids leakage of cement slurry.

[0076] In the present invention, an intelligent monitoring module is provided in the junction box body 10, whose built-in RFID chip records installation information, and the mobile phone NFC reads construction time, responsible person and other data. The integrated humidity sensor monitors the water seepage in the box in real time through Bluetooth transmission. The operating temperature is -20℃-60℃, the humidity detection range is 0-100% RH (accuracy ±2%), the output signal is 4-20mA / RS485, and the wiring scheme inside the junction box body 10 is a four-wire connection method. The power line (V+ / GND) and the signal line (S+ / S-) are separated to reduce interference and anti-interference measures. The signal line uses a twisted shielded pair cable, and the distance from the high-voltage line is >30cm.

[0077] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A grout-proof device for pre-embedded junction box installation, comprising a concrete layer (13), characterized in that: A junction box body (10) is buried in the concrete layer (13), a wiring tube (14) is connected to one side of the junction box body (10), a rotating mechanism is provided through the junction box body (10), one end of the rotating mechanism is connected to a pushing structure, a blocking structure is sleeved on the rotating mechanism, one end of the pushing structure is connected to a closing mechanism, and the closing mechanism corresponds to the four side walls of the junction box body (10).

2. The anti-leakage slurry device for pre-embedded junction box installation according to claim 1, characterized in that: Four mounting holes (18) are provided on four side walls around the junction box body (10), and a movable clamping block (9) is connected in the mounting holes (18). One end of the wiring tube (14) passes through one of the mounting holes (18) and extends into the junction box body (10), and the wiring tube (14) is buried in the concrete layer (13).

3. The anti-leakage slurry device for pre-embedded installation of a junction box according to claim 1, characterized in that: One end of the wiring tube (14) is connected to a closing head (15).

4. The anti-leakage slurry device for pre-embedded junction box installation according to claim 1, characterized in that: The rotating mechanism comprises a stud (7) penetrating one side of the junction box body (10); a rotating wheel (8) is fixed to one end of the stud (7); a mounting block (6) is provided at one end of the rotating wheel (8); and the stud (7) is rotatably sleeved on the mounting block (6).

5. The anti-leakage slurry device for pre-embedded junction box installation according to claim 4, characterized in that: The pushing structure comprises a moving block (11) threadedly connected to a stud (7), and four connecting rods (4) are rotatably connected at equal intervals on a peripheral side wall of the moving block (11).

6. The anti-leakage slurry device for pre-embedded junction box installation according to claim 4, characterized in that: The blocking structure comprises a blocking plate (1) which is arranged through the stud (7), and one end of the blocking plate (1) abuts against one side of the junction box body (10).

7. The anti-leakage slurry device for pre-embedded junction box installation according to claim 4, characterized in that: The closing mechanism comprises a connecting block (3) rotatably connected to one end of a stud (7), four support rods (2) being rotatably connected to a circle of the connecting block (3) at equal intervals, one end of a connecting rod (4) on the same side being rotatably connected to one end of a support rod (2) on the same side, a rotating rod (12) being fixed to one side of the support rod (2), a closing plate (5) being rotatably connected to the rotating rod (12), and a closing plate (5) on the same side being in contact with one side of a junction box body (10), and a side wall of the closing plate (5) being coated with a rubber layer.

8. The anti-leakage slurry device for pre-embedded junction box installation according to claim 1, characterized in that: The junction box body (10) is made of modified polypropylene mixed with glass fiber.

9. The anti-leakage slurry device for pre-embedded junction box installation according to claim 1, characterized in that: The junction box body (10) is filled with a water-soluble foam filler (17).

10. The anti-leakage slurry device for pre-embedded installation of a junction box according to claim 1, characterized in that: A polyurethane foaming gel (16) is coated on one peripheral outer wall of the junction box body (10).

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