A polyurethane filling device for door frame gaps in construction

Abstract

This invention relates to the field of building joint filling technology, specifically to a polyurethane filling device for door frame gaps in buildings. It includes a spray gun and an extension device. A nozzle is fixedly connected to the side wall of the spray gun. The extension device is located on one side of the nozzle and includes an extension rod threaded to the nozzle's outlet end. A slip ring is fitted onto the surface of the extension rod. Two support blocks are fixedly connected to the outer wall of the slip ring, and two rotating frames are rotatably connected to the inner wall of the slip ring. A ball bearing is movably connected inside the rotating frames. A damping rubber layer is provided inside the slip ring near the rotating frames to adjust the rotational damping of the rotating frames. The extension rod, threaded to the nozzle's outlet end, effectively expands the foaming agent spray path, flexibly adapting to deep, narrow, and concealed door frame gaps. Furthermore, the slip ring on the extension rod's surface, combined with the rotating frames and ball bearings with their damping rubber layer, forms a stable support point to prevent nozzle wobbling.

Description

Technical Field

[0001] This invention relates to the field of building joint filling technology, and more specifically, to a polyurethane filling device for door frame gaps in buildings. Background Technology

[0002] Sealing the gaps in building door frames is a crucial step in door frame installation. Its core purpose is to fix the position of the door frame, block the penetration path of water and air, buffer the deformation stress between the wall and the door frame, and improve sound insulation and thermal insulation performance. It is necessary to strictly follow the process of "base treatment - filling - sealing - curing" and match appropriate materials to avoid problems such as loosening of the door frame, water seepage, and cracking in the later stage.

[0003] According to existing technology, when installing building door frames, polyurethane is sprayed into the gaps of the door frame using a spray gun. Polyurethane has a high foaming expansion rate, strong adhesion, and also has the effects of heat insulation and sound insulation. Traditional filling operations rely on manual operation of the spray gun, which lacks stable support and position limiting structure for the nozzle. As construction workers hold the spray gun for a long time, they are prone to hand fatigue and shaking, which causes the nozzle to deviate and the foaming agent spray path to become out of control, resulting in uneven thickness of the filling layer. Summary of the Invention

[0004] This invention provides a polyurethane filling device for door frame gaps in construction. An extension rod threaded to the nozzle outlet of a spray gun effectively expands the foaming agent spray path, flexibly adapting to deep, narrow, and concealed door frame gaps. Furthermore, a slip ring fitted on the surface of the extension rod, combined with a rotating frame and ball bearing with a damping rubber layer on its inner wall, forms a stable support point to prevent nozzle wobbling. This solves the problem mentioned in the background art: prolonged hand fatigue and shaking during spray gun handling by construction workers can cause nozzle deviation, uncontrolled foaming agent spray path, and uneven filler thickness.

[0005] To achieve the above objectives, a polyurethane filling device for door frame gaps in construction includes a spray gun and an extension device. A nozzle is fixedly connected to the side wall of the spray gun, and the extension device is located on one side of the nozzle. The extension device includes an extension rod threaded to the discharge end of the nozzle. A slip ring is sleeved on the surface of the extension rod. Two support blocks are fixedly connected to the outer wall of the slip ring, and two rotating frames are rotatably connected to the inner wall of the slip ring. A ball is movably connected inside the rotating frame, and a damping rubber layer is provided inside the slip ring near the rotating frame for adjusting the rotation damping of the rotating frame. The slip ring has two limiting devices on its surface. Each limiting device includes a rotating block rotatably connected to the outer wall of the slip ring. A clamp is fixedly connected to one end of the rotating block near the extension rod. An anti-slip sleeve is fixedly connected to the surface of the clamp. The anti-slip sleeve is fitted onto the surface of the extension rod. The limiting devices are used to restrict the position of the slip ring on the surface of the extension rod.

[0006] In the above technical solution, the surface of the extension rod is provided with multiple placement grooves, and anti-slip strips are bonded inside the placement grooves. The slip ring and two anti-slip sleeves are fitted on the surface of the anti-slip strips. The anti-slip strips are used to increase the friction between the slip ring, the anti-slip sleeves and the extension rod, and improve the limiting stability.

[0007] Secondly, two connecting strips are fixedly connected to the surfaces of both clamping cylinders, and magnetic strips are fixedly connected to the surfaces of the connecting strips. The two magnetic strips that are close to each other are magnetically attracted to each other. The connecting strips and magnetic strips cooperate to clamp and fix the two clamping cylinders on the outer peripheral wall of the extension rod. Push blocks are fixedly connected to the ends of the two rotating blocks that are far apart from each other. The surface of the rotating block is provided with a rotating hole. The rotating block rotates on the surface of the slip ring through the rotating hole. The push block is used to increase the contact area for applying force and facilitate the rotation of the rotating block.

[0008] Furthermore, based on the above, each of the two support blocks is equipped with a cleaning device. The cleaning device includes two inserts inserted into the two support blocks respectively. A limiting disc is fixedly connected to the side wall of each insert. Multiple sleeves are fitted onto the surface of each insert, and a cleaning brush is fixedly connected inside each sleeve. The cleaning brush is fitted onto the surface of the extension rod. The cleaning brush is used to remove dust, stains, debris, and other impurities adhering to the surface of the extension rod. A filling ring is fixedly connected to the side wall of the limiting disc. The filling ring is located on one side of the sleeve and is used to reduce the gap between the sleeve and the limiting disc, preventing the sleeve from moving axially along the insert.

[0009] Meanwhile, a top ring is fitted onto the surface of the insertion post, located between the sleeve and the support block. The top ring restricts the position of the sleeve on the surface of the insertion post. A knob is threaded onto the surface of the insertion post, located on one side of the support block. The knob restricts the position of the insertion post inside the support block. An insertion hole is formed on the surface of the support block, and the insertion post is inserted into the insertion hole. The insertion hole is designed for the support block to accommodate the insertion post. The cleaning brush is a wire brush, used to remove stubborn stains from the surface of the extension rod. Rubber layers are provided on both sides of the top ring, used to fill the gaps between the top ring and the support block and the surface of the sleeve.

[0010] Compared with the prior art, the beneficial effects of the present invention are as follows: In this polyurethane filling device for door frame gaps in construction, the extension rod, connected by a threaded connection at the nozzle outlet of the spray gun, effectively expands the spray path of the foaming agent, flexibly adapting to deep, narrow, and concealed door frame gaps. The slip ring fitted on the surface of the extension rod, combined with a rotating frame and ball bearing with a damping rubber layer on its inner wall, forms a stable support point to prevent nozzle wobbling. Simultaneously, the limiting device on the outer wall of the slip ring, through a rotating block, drives the clamping cylinder to clamp the extension rod. The anti-slip sleeve and the anti-slip strip on the extension rod surface work together to increase friction. Combined with the magnetic strip on the connecting strip, the slip ring position is locked. The push block design also allows construction personnel to quickly adjust the clamping state of the clamping cylinder, further improving the stability and ease of operation during the filling process. The cleaning device on the support block, through a steel wire cleaning brush fixed by an insert post, efficiently removes dust, debris, and residual polyurethane from the surface of the extension rod. The filling ring and top ring design prevent axial movement of the sleeve, ensuring that the cleaning brush always adheres to the surface of the extension rod. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a side view of the slip ring structure in this invention; Figure 3 This is a top view of the spray gun structure in this invention; Figure 4 This is an enlarged structural diagram of point A in this invention; Figure 5 This is a top view of the sleeve structure in this invention; Figure 6 This is a side view of the extension rod in this invention. Figure 7 This is an enlarged structural diagram of point B in the present invention.

[0012] The meanings of the labels in the diagram are as follows: 1. Spray gun; 2. Nozzle; 3. Extension device; 31. Extension rod; 32. Slip ring; 33. Support block; 34. Rotating frame; 35. Rolling ball; 36. Placement groove; 37. Anti-slip strip; 4. Limiting device; 41. Rotating block; 42. Clamping sleeve; 43. Anti-slip sleeve; 44. Connecting strip; 45. Magnetic strip; 46. Push block; 47. Rotating hole; 5. Cleaning device; 51. Insert post; 52. Limiting plate; 53. Sleeve; 54. Cleaning brush; 55. Filler ring; 56. Top ring; 57. Knob; 58. Insertion hole. Detailed Implementation

[0013] The technical solutions of this invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0014] Because construction workers are prone to hand fatigue and shaking when holding the spray gun for a long time, the nozzle may deviate and the foaming agent may be sprayed out of control, resulting in uneven thickness of the sealant layer.

[0015] Therefore, in view of the above-mentioned problems, the present invention provides a polyurethane filling device for door frame gaps in construction, with reference to... Figures 1-4 As shown, the device includes a spray gun 1 and an extension device 3. A nozzle 2 is fixedly connected to the side wall of the spray gun 1. The extension device 3 is located on one side of the nozzle 2. The extension device 3 includes an extension rod 31 that is threaded to the discharge end of the nozzle 2. The threaded connection design not only makes disassembly and assembly convenient, but also allows for flexible replacement of extension rods 31 of different lengths according to the depth of the gap in the door frame. A slip ring 32 is fitted on the surface of the extension rod 31. Two support blocks 33 are fixedly connected to the outer wall of the slip ring 32. Two rotating frames 34 are rotatably connected to the inner wall of the slip ring 32. A ball 35 is movably connected inside the rotating frame 34. During the filling operation, the ball 35 forms a stable support point with the wall or door frame surface, replacing the manual operation of simply holding the spray gun 1, reducing the shaking of the nozzle 2 caused by hand tremors, improving the stability of the foaming agent spray path, and thus ensuring the filling accuracy. The slip ring 32 has a damping rubber layer near the rotating frame 34, which can flexibly adjust the rotation damping of the rotating frame 34 according to construction needs, so that the support angle can be adapted to different gap directions, further enhancing the operational flexibility and support reliability. The extension rod 31 has multiple placement grooves 36 on its surface, and anti-slip strips 37 are bonded inside the placement grooves 36. The slip ring 32 and two anti-slip sleeves 43 are fitted on the surface of the anti-slip strips 37. The anti-slip strips 37 increase the friction between the slip ring 32, the anti-slip sleeves 43 and the extension rod 31, effectively preventing the slip ring 32 from axially shifting due to force during the filling process, ensuring the stability of the support and limiting structure, ensuring that the preset spray angle and position are maintained throughout the filling operation, and improving the overall filling quality.

[0016] refer to Figure 2As shown, the surface of the slip ring 32 is provided with two limiting devices 4. The setting of the limiting devices 4 can limit the axial position of the slip ring 32 on the surface of the extension rod 31, avoid the slip ring 32 from shifting during the filling operation and causing support failure, and ensure the stability of the spray angle of the spray gun 1. The limiting device 4 includes a rotating block 41 rotatably connected to the outer wall of the slip ring 32. A clamp 42 is fixedly connected to one end of the rotating block 41 near the extension rod 31. An anti-slip sleeve 43 is fixedly connected to the surface of the clamp 42. The anti-slip sleeve 43 is sleeved on the surface of the extension rod 31. The anti-slip sleeve 43 can increase the contact friction between the clamp 42 and the extension rod 31, reduce the relative sliding between the clamp 42 and the extension rod 31, and improve the initial limiting effect. Two connecting strips 44 are fixedly connected to the surfaces of the two clamping cylinders 42. Magnetic strips 45 are fixedly connected to the surfaces of the connecting strips 44. The two magnetic strips 45, which are close to each other, attract each other. The cooperation between the connecting strips 44 and the magnetic strips 45 further enhances the clamping force of the two clamping cylinders 42 on the extension rod 31, achieving the locking of the clamping cylinders 42 on the outer circumferential wall of the extension rod 31. This ensures the stability and reliability of the slip ring 32's position locking and prevents the slip ring 32 from shifting due to shaking or force application of the spray gun 1. Push blocks 46 are fixedly connected to the ends of the two rotating blocks 41 that are far apart from each other. Push blocks 46 can effectively increase the contact area for the construction personnel to apply force, making it easier to control the rotating blocks 41 to drive the clamping cylinders 42 to open and close quickly, reducing the difficulty of operation, and improving the convenience and efficiency of adjusting the limit device 4. A rotating hole 47 is opened on the surface of the rotating block 41. The rotating hole 47 rotates on the surface of the slip ring 32, providing stable rotational support for the opening and closing adjustment of the clamping cylinders 42.

[0017] refer to Figure 5 As shown, each of the two support blocks 33 is equipped with a cleaning device 5. The cleaning device 5 includes two inserts 51 inserted into the two support blocks 33 respectively. The insert-type structure design realizes the modular disassembly and assembly of the cleaning device 5. The cleaning brush 54 can be quickly replaced and maintained without special tools, which improves the practicality and adaptability of the device. The side walls of the two inserts 51 are fixedly connected to the limit plate 52. The surface of the two inserts 51 is covered with multiple sleeves 53. The cleaning brush 54 is fixedly connected inside the sleeves 53. The cleaning brush 54 is covered on the surface of the extension rod 31 and can remove dust, stains, debris and other debris attached to the surface of the extension rod 31. A filling ring 55 is fixedly connected to the side wall of the limiting plate 52. The filling ring 55 is located on one side of the sleeve 53, which effectively reduces the gap between the sleeve 53 and the limiting plate 52, prevents the sleeve 53 from moving axially along the insertion post 51, and ensures that the cleaning brush 54 fits the surface of the extension rod 31. A top ring 56 is fitted on the surface of the insertion post 51. The top ring 56 is located between the sleeve 53 and the support block 33, which can further limit the position of the sleeve 53 on the surface of the insertion post 51, prevent the sleeve 53 from shifting during cleaning operations, which would reduce the cleaning effect and improve the stability and reliability of the cleaning operation.

[0018] Refer again Figure 5 As shown, a knob 57 is threaded onto the surface of the insertion post 51. The knob 57 is located on one side of the support block 33. By tightening the knob 57, the position of the insertion post 51 inside the support block 33 is restricted, so as to prevent the insertion post 51 from loosening or shifting during the cleaning operation, and to ensure the stability of the overall structure of the cleaning device 5 and the reliability of the cleaning operation. An insertion hole 58 is provided on the surface of the support block 33. The insertion post 51 is inserted into the insertion hole 58. The insertion hole 58 provides a stable installation support point for the insertion post 51. The insertion hole 58 is used for the support block 33 to accommodate the insertion post 51. The cleaning brush 54 is a steel wire brush. Compared with ordinary brushes, steel wire brushes have higher hardness and stronger cleaning ability, which can effectively remove stubborn stains such as cured polyurethane residue and sand particles attached to the surface of the extension rod 31. Both sides of the top ring 56 are provided with rubber layers. The rubber layers fill the gaps between the top ring 56 and the support block 33 and the sleeve 53. On the one hand, it enhances the fit between the top ring 56 and each component, prevents the sleeve 53 from moving axially during the cleaning process, and ensures that the cleaning brush 54 is always in close contact with the surface of the extension rod 31. On the other hand, it plays a buffering and shock-absorbing role, reduces frictional wear between components, and extends the overall service life of the cleaning device 5.

[0019] The working principle of this invention is as follows: Construction workers select an extension rod 31 of suitable length based on the depth of the gap to be filled in the door frame, and then tighten the extension rod 31 onto the discharge port of the nozzle 2 of the spray gun 1 via a threaded connection. Next, a slip ring 32 with an anti-slip sleeve 43 is fitted onto the anti-slip strip 37 on the surface of the extension rod 31. By rotating the rotating block 41 using the push block 46, the two clamping cylinders 42 are brought closer together, allowing the anti-slip sleeves 43 on the surface of the clamping cylinders 42 to adhere to the outer wall of the extension rod 31. Simultaneously, the connecting strips 44 on the two clamping cylinders 42 also close together, and the magnetic strips 45 on the surface of the connecting strips 44 attract each other.

[0020] After the position of the slip ring 32 is locked, the rotating frame 34 on the inner wall of the slip ring 32 is rotated according to the direction of the gap in the door frame. The damping rubber layer between the rotating frame 34 and the slip ring 32 can flexibly adjust the rotation damping of the rotating frame 34. The construction personnel can adjust the rotating frame 34 to the angle that matches the direction of the gap as needed, so that the rolling ball 35 inside the rotating frame 34 fits tightly against the wall or door frame surface to form a stable support point.

[0021] In addition, insert the post 51 of the cleaning device 5 into the insertion hole 58 of the support block 33, put on the sleeve 53 with the cleaning brush 54, so that the cleaning brush 54 fits against the surface of the extension rod 31, and then tighten the knob 57 at the end of the post 51 to restrict the position of the post 51 in the support block 33; at this time, the rubber layers on both sides of the top ring 56 will fill the gap between the top ring 56 and the support block 33 and the sleeve 53.

[0022] When starting the spray gun 1 to spray polyurethane foam, the construction worker only needs to hold the spray gun 1. The contact support point between the ball 35 and the wall and door frame can ensure the stability of the spray gun 1 nozzle 2, so that the foam spray path remains relatively stable, which is conducive to improving the filling accuracy.

[0023] During the filling process, the anti-slip strip 37 continuously enhances the friction between the slip ring 32, the anti-slip sleeve 43, and the extension rod 31. The magnetic locking structure and anti-slip structure of the limiting device 4 provide double protection. Simultaneously, as the extension rod 31 moves within the gap, the cleaning brush 54 of the cleaning device 5 removes dust, sand particles, and a small amount of cured polyurethane residue adhering to the surface of the extension rod 31, preventing impurities from affecting the adhesion between the foaming agent and the gap, and further improving the overall filling quality.

[0024] After the filling operation is completed, close the spray gun 1 to stop the material discharge, rotate the rotating block 41 in the opposite direction by pushing block 46 to separate the magnetic strip 45 on the clamp 42, release the locking device 4 on the slip ring 32, and then remove the slip ring 32 from the extension rod 31; then loosen the threaded connection between the extension rod 31 and the nozzle 2 to complete the disassembly of the extension rod 31.

[0025] For the cleaning device 5, loosening the knob 57 allows the insert 51 to be pulled out from the insertion hole 58 of the support block 33, which enables the cleaning brush 54 to be cleaned or replaced. This modular plug-in structure does not require special tools and can quickly complete the maintenance of the cleaning brush 54, preparing it for the next operation.

[0026] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A polyurethane filling device for door frame gaps in construction, comprising a spray gun (1) and an extension device (3), characterized in that: The spray gun (1) has a nozzle (2) fixedly connected to its side wall. The extension device (3) is located on one side of the nozzle (2). The extension device (3) includes an extension rod (31) threaded to the discharge end of the nozzle (2). A slip ring (32) is sleeved on the surface of the extension rod (31). Two support blocks (33) are fixedly connected to the outer wall of the slip ring (32). Two rotating frames (34) are rotatably connected to the inner wall of the slip ring (32). A ball (35) is movably connected inside the rotating frame (34). A damping rubber layer is provided inside the slip ring (32) near the rotating frame (34) to adjust the rotation damping of the rotating frame (34). The surface of the slip ring (32) is provided with two limiting devices (4). The limiting device (4) includes a rotating block (41) rotatably connected to the outer wall of the slip ring (32). A clamp (42) is fixedly connected to one end of the rotating block (41) near the extension rod (31). An anti-slip sleeve (43) is fixedly connected to the surface of the clamp (42). The anti-slip sleeve (43) is sleeved on the surface of the extension rod (31). The limiting device (4) is used to limit the position of the slip ring (32) on the surface of the extension rod (31).

2. The polyurethane filling device for door frame gaps in construction according to claim 1, characterized in that: The extension rod (31) has multiple placement grooves (36) on its surface. Anti-slip strips (37) are bonded inside the placement grooves (36). The slip ring (32) and two anti-slip sleeves (43) are fitted on the surface of the anti-slip strips (37). The anti-slip strips (37) are used to increase the friction between the slip ring (32), the anti-slip sleeves (43) and the extension rod (31), thereby improving the limiting stability.

3. The polyurethane filling device for door frame gaps in construction according to claim 2, characterized in that: Two connecting strips (44) are fixedly connected to the surfaces of the two clamping cylinders (42). Magnetic strips (45) are fixedly connected to the surfaces of the connecting strips (44). The two magnetic strips (45) that are close to each other are magnetically attracted to each other. The connecting strips (44) and magnetic strips (45) cooperate to achieve clamping and fixing of the two clamping cylinders (42) on the outer peripheral wall of the extension rod (31).

4. The polyurethane filling device for door frame gaps in construction according to claim 1, characterized in that: Each of the two rotating blocks (41) is fixedly connected to a push block (46) at one end away from each other. The rotating block (41) has a rotating hole (47) on its surface. The rotating hole (47) rotates on the surface of the slip ring (32) through the rotating hole (47). The push block (46) is used to increase the contact area for applying force, making it easier to control the rotating block (41) to rotate.

5. The polyurethane filling device for door frame gaps in construction according to claim 1, characterized in that: Each of the two support blocks (33) is equipped with a cleaning device (5). The cleaning device (5) includes two inserts (51) inserted into the two support blocks (33) respectively. The side walls of the two inserts (51) are fixedly connected to limit plates (52). Multiple sleeves (53) are fitted on the surface of the two inserts (51). A cleaning brush (54) is fixedly connected inside the sleeve (53). The cleaning brush (54) is fitted on the surface of the extension rod (31). The cleaning brush (54) is used to remove dust, stains, debris and other debris attached to the surface of the extension rod (31).

6. The polyurethane filling device for door frame gaps in construction according to claim 5, characterized in that: A filling ring (55) is fixedly connected to the side wall of the limiting plate (52). The filling ring (55) is located on one side of the sleeve (53). The filling ring (55) is used to reduce the gap between the sleeve (53) and the limiting plate (52) and prevent the sleeve (53) from moving axially along the insertion post (51).

7. The polyurethane filling device for door frame gaps in construction according to claim 5, characterized in that: The surface of the insert (51) is fitted with a top ring (56), which is located between the sleeve (53) and the support block (33). The top ring (56) is used to limit the position of the sleeve (53) on the surface of the insert (51).

8. The polyurethane filling device for door frame gaps in construction according to claim 5, characterized in that: The surface of the insert (51) is threaded with a knob (57), which is located on one side of the support block (33) and is used to limit the position of the insert (51) inside the support block (33).

9. The polyurethane filling device for door frame gaps in construction according to claim 5, characterized in that: The surface of the support block (33) is provided with a socket (58), and the plug (51) is inserted into the socket (58). The socket (58) is provided for the support block (33) to receive the plug (51).

10. The polyurethane filling device for door frame gaps in construction according to claim 7, characterized in that: The cleaning brush (54) is a wire brush, which is used to remove stubborn stains from the surface of the extension rod (31). Both sides of the top ring (56) are provided with rubber layers, which are used to fill the gaps between the top ring (56) and the support block (33) and the sleeve (53).

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