Injection molding device for producing thermal insulation materials

Abstract

The present invention belongs to the technical field of thermal insulation material preparation, and discloses an injection molding device for the production of thermal insulation materials, including a shell and a guide roller, and also includes: a support assembly, which is installed inside the shell; a connection assembly, which is equidistantly arranged on the support assembly; a nozzle, which is fixed to the connection assembly; and a feeding assembly, which is arranged inside the shell for conveying thermal insulation coating to the nozzle. The above scheme drives the adjustment frame upward by running the hydraulic rod. When a number of limiting vertical rods respectively limit a number of sleeve blocks 2 and a number of guide grooves 1 respectively limit a number of T-shaped frames, the adjustment frame will force all T-shaped frames to move upward and drive a number of nozzles to move upward, thereby increasing the distance between two adjacent nozzles, thereby ensuring that the range of injection can still completely cover the fabric when the nozzle spacing increases, thereby solving the problem that the nozzle injection range of the existing injection equipment cannot adapt to the width of the fabric when adjusting the nozzle spacing.

Description

Technical Field

[0001] The invention belongs to the technical field of heat insulation material preparation, in particular to an injection molding device for producing heat insulation materials. Background Art

[0002] Common textile thermal insulation materials usually use special fibers or spray a layer of thermal insulation materials on textiles to make them have thermal insulation functions. In order to ensure that people are comfortable when wearing clothes, people usually only spray thermal insulation materials on one side of the textile fabric.

[0003] For example, the invention with publication number CN117019493A discloses an automatic injection composite molding device for the production of thermal insulation materials. It controls the telescopic drive part to move the adjustment plate and utilizes the function of the strip slide and the guide column to allow all nozzles to retract or expand synchronously, thereby adjusting the injection width of the thermal insulation raw materials and making it suitable for the production and preparation of various types of composite thermal insulation materials, thereby expanding the processing and application range of the device.

[0004] When the above solution adjusts the nozzles to expand synchronously to adapt to the width of the textile fabric, due to the increase in the nozzle spacing, at this time (such as the attached Fig.12 The original nozzle spray range cannot completely cover the fabric. If the spray ranges of the two nozzles are initially set to overlap (as shown in the attached Fig.13 As shown in the figure, when adjusting the nozzle to expand synchronously to adapt to the width of the textile fabric, although the nozzle can be guaranteed to completely cover the fabric, the fabric in the overlapping part will be sprayed with double the coating, which will lead to waste of coating and increase production costs. Based on this, the present application proposes an injection molding device for the production of thermal insulation materials to overcome the above defects. Summary of the invention

[0005] In order to solve the problems raised in the above background technology, the present invention provides an injection molding device for producing thermal insulation materials, which solves the problem that the injection range of the nozzle cannot adapt to the width of the fabric when adjusting the nozzle spacing of the existing injection equipment.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an injection molding device for producing heat-insulating materials, comprising a shell and a guide roller, and further comprising: a support assembly installed inside the shell; a connecting assembly equidistantly arranged on the support assembly; a nozzle fixed to the connecting assembly; a feeding assembly arranged inside the shell for conveying heat-insulating coating to the nozzle; a driving assembly installed on one side of the supporting assembly for driving the connecting assembly to move;

[0007] The support assembly comprises a frame fixedly connected to the inside of the shell, a slide rail is fixedly connected to one side of the frame symmetrically up and down, and a plurality of guide grooves are arranged on the frame in a fan-shaped distribution;

[0008] The connecting assembly comprises a limiting vertical rod, the top and bottom ends of which are movably sleeved on two slide rails respectively, a sleeve block 2 is movably sleeved on the outside of the limiting vertical rod, a T-shaped frame which can slide in a guide groove 1 is fixedly connected to the sleeve block 2, and one end of the T-shaped frame penetrates the frame body and extends to the other side of the frame body and is fixedly connected to the nozzle;

[0009] The frame body is symmetrically and fixedly connected with a hydraulic rod on one side away from the slide rail, the bottom of the hydraulic rod is fixedly connected with an adjustment frame, and the middle part of the T-shaped frame is sleeved inside the adjustment frame.

[0010] Preferably, the material conveying assembly includes a pipe with one end extending to the outside of the shell and fixedly connected to the shell, and a hose 1 is equidistantly and fixedly connected to the pipe, a storage box is sleeved on the top of the limiting vertical rod, and the storage box is fitted with the frame toward the side of the frame, and a hose 2 is also fixedly connected to the storage box, and one end of the hose 2 passes through the guide groove 2 and is connected to the nozzle.

[0011] Preferably, the limiting vertical rod includes a sleeve block 1 which is movably sleeved on the outside of the two slide rails, a column is movably connected between the two sleeve blocks 1, and the sleeve block 2 is movably sleeved on the outside of the column.

[0012] Preferably, a limiting groove 1 is provided on the outside of the column, and one end of the T-shaped frame located inside the sleeve block 2 is fixedly connected with a convex column that can slide in the limiting groove 1;

[0013] The upward movement of the T-shaped frame can drive the protruding column to move upward along the bottom of the limiting groove.

[0014] Preferably, the storage box is provided with a regulating component 1 for regulating the flow of the feeding component when the connecting component moves;

[0015] The regulating component 1 is used to separate the internal space of the storage box into a cavity 1 and a cavity 2 which are interconnected;

[0016] The second hose is communicated with the second cavity, and the first cavity is communicated with the first hose.

[0017] Preferably, the adjustment component includes a disc fixedly connected to the inside of the storage box and movably sleeved on the outside of the column, and also includes:

[0018] A disc 2 movably connected to the inside of the material storage box and fixedly sleeved on the outside of the column;

[0019] The disc one and the disc two are coaxially assembled, and the disc one and the disc two are respectively provided with through hole one and through hole two. The cavity one is initially connected with the cavity two through through hole one and through hole two. When the cylinder rotates, it can drive the disc two to rotate and increase the connected part between through hole one and through hole two.

[0020] Preferably, the nozzle is provided with a second regulating component for regulating the nozzle injection pressure;

[0021] The connecting assembly is also provided with a transmission assembly, and the second adjustment assembly and the connecting assembly are connected in transmission via the transmission assembly.

[0022] Preferably, the transmission assembly comprises a transmission frame movably sleeved on the outside of the column, a transmission belt is arranged on the transmission frame, the transmission frame is also movably sleeved on the outside of the slide rail, and the transmission frame is movably sleeved in the guide groove three;

[0023] The second adjustment component comprises a stopper movably connected to the inside of the nozzle, a connecting column is movably clamped on the top of the stopper, the top of the connecting column extends upward to the outside of the nozzle, a spline is provided on the part of the connecting column located above the nozzle, and a sleeve is movably sleeved outside the spline;

[0024] The sleeve is movably mounted on one end of the transmission frame away from the column, and the column is connected to the sleeve through a transmission belt;

[0025] The connecting column is provided with a second limiting groove, and the top of the nozzle is fixedly connected with a convex shaft that can slide in the second limiting groove;

[0026] In the initial state, the convex shaft is located at the second top end of the limiting groove.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] The above scheme drives the adjustment frame upward by running the hydraulic rod. When a plurality of limit vertical rods respectively limit a plurality of sleeve blocks 2 and a plurality of guide grooves 1 respectively limit a plurality of T-shaped frames, the adjustment frame will force all T-shaped frames to move upward and drive a plurality of nozzles to move upward, thereby increasing the distance between two adjacent nozzles, thereby ensuring that the spraying range of the nozzles can still completely cover the fabric when the nozzle spacing is increased, thereby solving the problem that the nozzle spraying range of the existing spraying equipment cannot adapt to the fabric width when the nozzle spacing is adjusted;

[0029] The above scheme drives the convex column upward along the bottom of the limiting groove 1 by the T-shaped frame moving upward, thereby forcing the column to rotate, and then driving the disc 2 to rotate, so that the connecting part between the through hole 1 and the through hole 2 is increased, and then the connecting part between the cavity 1 and the cavity 2 is increased to increase the amount of paint input into the nozzle by the feeding component, thereby avoiding the problem that the amount of paint sprayed by the nozzle per unit area will be reduced when the nozzle increases the spraying range upward;

[0030] The above scheme drives the sleeve to rotate through the rotation of the column and the transmission belt, and then drives the connecting column to rotate. At this time, under the limitation of the cam shaft, the connecting column will be forced to drive the block upward, thereby increasing the amount of thermal insulation coating that can be sprayed out through the nozzle, and also reducing the sudden increase in pressure due to the increase in the amount of coating transported by the feeding component. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0032] Figure 2 It is a schematic diagram of the matching structure of the housing and the support assembly of the present invention;

[0033] Figure 3 for Figure 2 The enlarged view of point A in the middle;

[0034] Figure 4 It is a schematic diagram of the matching structure of the support assembly and the driving assembly of the present invention;

[0035] Figure 5 for Figure 4 The enlarged view of point B in the middle;

[0036] Figure 6 It is a schematic diagram of the structure of the driving assembly of the present invention;

[0037] Figure 7 It is a partial cross-sectional structural schematic diagram of the material storage box of the present invention;

[0038] Figure 8 It is a structural schematic diagram of the regulating component 1 of the present invention;

[0039] Fig. 9 It is a front cross-sectional structural schematic diagram of the present invention;

[0040] Fig.10 Fig. 9 Enlarged view of point C in the middle;

[0041] Fig.11 for Fig. 9 The enlarged view of point D in the middle;

[0042] Fig.12 It is a simplified plan view of the spray range when the nozzle spacing increases;

[0043] Fig.13 This is a simplified plan view of the nozzle spray ranges overlapping.

[0044] In the figure: 1, housing; 11, guide roller; 2, support assembly; 21, frame; 211, guide groove 1; 212, guide groove 2; 213, guide groove 3; 22, slide rail; 3, connecting assembly; 31, limit vertical rod; 311, sleeve block 1; 312, column; 313, limit groove 1; 32, sleeve block 2; 33, T-shaped frame; 331, convex column; 4, driving assembly; 41, hydraulic rod; 42, adjusting frame; 5, feeding assembly; 5 1. Pipe; 511. Hose 1; 52. Storage box; 521. Cavity 1; 522. Cavity 2; 53. Hose 2; 6. Adjustment component 1; 61. Disc 1; 611. Through hole 1; 62. Disc 2; 621. Through hole 2; 7. Transmission component; 71. Transmission belt; 72. Transmission frame; 8. Nozzle; 81. Cam; 9. Adjustment component 2; 91. Block; 92. Connecting column; 921. Limiting groove 2; 93. Sleeve. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] like Figures 1 to 13 As shown, the present invention provides an injection molding device for producing heat insulating materials, comprising a shell 1 and a guide roller 11, and further comprising: a support assembly 2, which is installed inside the shell 1; a connecting assembly 3, which is equidistantly arranged on the support assembly 2; a nozzle 8, which is fixed to the connecting assembly 3; a feeding assembly 5, which is arranged inside the shell 1 and is used to feed the heat insulating coating into the nozzle 8; a driving assembly 4, which is installed on one side of the supporting assembly 2 and is used to drive the connecting assembly 3 to move;

[0047] The support assembly 2 includes a frame 21 fixed to the inside of the housing 1, a slide rail 22 is fixed symmetrically up and down on one side of the frame 21, and a plurality of guide grooves 211 are arranged in a fan-shaped manner on the frame 21;

[0048] The connecting assembly 3 includes a limiting vertical rod 31, the top and bottom ends of which are movably sleeved on two slide rails 22, respectively. A sleeve block 2 32 is movably sleeved on the outside of the limiting vertical rod 31, and a T-shaped frame 33 that can slide in the guide groove 1 211 is fixedly connected to the sleeve block 22. One end of the T-shaped frame 33 penetrates the frame body 21 and extends to the other side of the frame body 21 and is fixedly connected to the nozzle 8.

[0049] The frame body 21 is symmetrically fixedly connected to a hydraulic rod 41 on one side away from the slide rail 22. The bottom of the hydraulic rod 41 is fixedly connected to an adjustment frame 42. The middle part of the T-shaped frame 33 is sleeved inside the adjustment frame 42.

[0050] The feeding assembly 5 includes a pipe 51 at one end extending to the outside of the housing 1 and fixedly connected to the housing 1, and a hose 1 511 is equidistantly and fixedly connected to the pipe 51, and a storage box 52 is sleeved on the top of the limiting vertical rod 31, and the storage box 52 is in contact with the frame 21 on the side facing the frame 21, and a hose 2 53 is also fixedly connected to the storage box 52, and one end of the hose 2 53 passes through the guide groove 212 and is connected to the nozzle 8;

[0051] By adopting the above scheme, the adjustment frame 42 is driven upward by running the hydraulic rod 41. When several limiting vertical rods 31 limit several sets of blocks 2 32 respectively and several guide grooves 1 211 limit several T-shaped frames 33 respectively, the adjustment frame 42 will force all T-shaped frames 33 to move upward and drive several nozzles 8 to move upward, thereby increasing the distance between two adjacent nozzles 8, thereby ensuring that the injection range of the nozzles 8 can still completely cover the fabric when the spacing between the nozzles is increased, thereby solving the problem that the nozzle injection range of the existing injection equipment cannot adapt to the width of the fabric when the nozzle spacing is adjusted.

[0052] like Figure 2-4 and Figure 6-11 As shown, the limiting vertical rod 31 includes a sleeve block 311 movably sleeved on the outside of the two slide rails 22, a column 312 is movably connected between the two sleeve blocks 311, and the sleeve block 32 is movably sleeved on the outside of the column 312;

[0053] A limiting groove 1 313 is formed on the outside of the column 312, and one end of the T-shaped frame 33 located inside the sleeve block 2 32 is fixedly connected with a protruding column 331 that can slide in the limiting groove 1 313;

[0054] The storage box 52 is provided with a regulating component 6 for regulating the flow of the feeding component 5 when the connecting component 3 moves;

[0055] The adjusting component 1 6 is used to separate the internal space of the storage box 52 into a cavity 1 521 and a cavity 2 522 which are interconnected;

[0056] The second hose 53 is connected to the second cavity 522, and the first cavity 521 is connected to the first hose 511;

[0057] The adjusting component 6 includes a disc 61 fixedly connected to the inside of the storage box 52 and movably sleeved on the outside of the column 312, and also includes:

[0058] A second disc 62 movably connected to the inside of the storage box 52 and fixedly sleeved on the outside of the column 312;

[0059] The disc 1 61 and the disc 2 62 are coaxially assembled, and the disc 1 61 and the disc 2 62 are respectively provided with a through hole 1 611 and a through hole 2 621. The cavity 1 521 is initially connected with the cavity 2 522 through the through hole 1 611 and the through hole 2 621. When the column 312 rotates, the disc 2 62 can be driven to rotate, and the connecting portion between the through hole 1 611 and the through hole 2 621 can be enlarged.

[0060] By adopting the above scheme, the T-shaped frame 33 moves upward to drive the protrusion 331 to move upward along the bottom of the limiting groove 1 313, thereby forcing the column 312 to rotate, and then driving the disc 2 62 to rotate, so that the connecting portion between the through hole 1 611 and the through hole 2 621 is increased, and then the connecting portion between the cavity 1 521 and the cavity 2 522 is increased to increase the amount of paint input into the nozzle 8 by the feeding component 5, thereby avoiding the problem that the amount of paint sprayed by the nozzle 8 per unit area will decrease when the nozzle 8 moves upward to increase the spraying range.

[0061] like Figure 3-7 and Figure 9-10 As shown, the nozzle 8 is provided with an adjusting component 9 for adjusting the injection pressure of the nozzle 8;

[0062] The connecting component 3 is also provided with a transmission component 7, and the adjusting component 9 and the connecting component 3 are connected to each other through the transmission component 7;

[0063] The transmission assembly 7 includes a transmission frame 72 movably mounted on the outside of the column 312, a transmission belt 71 is arranged on the transmission frame 72, and the transmission frame 72 is also movably mounted on the outside of the slide rail 22, and the transmission frame 72 is movably mounted in the guide groove 3 213;

[0064] The second adjustment component 9 includes a stopper 91 movably connected to the inside of the nozzle 8, a connecting column 92 is movably connected to the top of the stopper 91, and the top of the connecting column 92 extends upward to the outside of the nozzle 8. The part of the connecting column 92 located above the nozzle 8 is provided with a spline, and a sleeve 93 is movably sleeved outside the spline;

[0065] The sleeve 93 is movably mounted on the end of the transmission frame 72 away from the column 312, and the column 312 is connected to the sleeve 93 through the transmission belt 71;

[0066] The connecting column 92 is provided with a second limiting groove 921, and the top of the nozzle 8 is fixedly connected with a convex shaft 81 which can slide in the second limiting groove 921;

[0067] In the initial state, the convex shaft 81 is located at the top end of the second limiting groove 921 .

[0068] By adopting the above scheme, the column 312 rotates and drives the sleeve 93 to rotate through the transmission belt 71, thereby driving the connecting column 92 to rotate. At this time, under the limit of the cam 81, the connecting column 92 is forced to drive the block 91 upward, thereby increasing the amount of thermal insulation coating that can be sprayed out through the nozzle 8 and reducing the pressure of the coating sprayed out by the nozzle 8, thereby avoiding the situation where the pressure of the coating sprayed is too high and causes the coating to penetrate the textile fabric.

[0069] The working principle and use process of the present invention:

[0070] The textile fabric is guided and supported by the guide roller 11. When the width of the textile fabric increases, the adjustment frame 42 is driven upward by running the hydraulic rod 41. Under the limitation of the plurality of sleeve blocks 2 32 by the plurality of limiting vertical rods 31 and the limitation of the plurality of T-shaped frames 33 by the plurality of guide grooves 1 211, the adjustment frame 42 forces all the T-shaped frames 33 to move upward and drives the plurality of nozzles 8 to move upward, thereby increasing the distance between two adjacent nozzles 8, thereby ensuring that the range of the nozzles 8 can still completely cover the fabric when the distance between the nozzles 8 increases.

[0071] When the T-shaped frame 33 moves upward, it will also drive the protruding column 331 to move upward along the bottom of the limiting groove 1 313, thereby forcing the column 312 to rotate, and then driving the disc 2 62 to rotate, so that the connecting portion between the through hole 1 611 and the through hole 2 621 is increased, and then the connecting portion between the cavity 1 521 and the cavity 2 522 is increased to increase the amount of coating inputted into the nozzle 8 by the feeding assembly 5, thereby ensuring that the amount of thermal insulation coating that can be sprayed onto the textile fabric by the nozzle 8 is stable when the nozzle 8 moves upward to increase the spraying range;

[0072] When the column 312 rotates, it will also drive the sleeve 93 to rotate through the transmission belt 71, and then drive the connecting column 92 to rotate. At this time, under the limit of the cam 81, the connecting column 92 will be forced to drive the block 91 upward, thereby increasing the amount of thermal insulation coating that can be sprayed out through the nozzle 8, and also reducing the sudden increase in pressure in the nozzle 8 caused by the increase in the amount of coating delivered by the feeding component 5.

[0073] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0074] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An injection molding device for producing thermal insulation materials, comprising a housing (1) and a guide roller (11), characterized in that: Also includes: A support assembly (2) installed inside the housing (1); A connecting component (3) is arranged on the supporting component (2) at equal distances; A nozzle (8) fixedly connected to the connecting assembly (3); A material delivery component (5), which is arranged inside the housing (1) and is used to deliver the thermal insulation coating to the nozzle (8); A driving assembly (4), which is mounted on one side of the supporting assembly (2) and is used to drive the connecting assembly (3) to move; The support assembly (2) comprises a frame (21) fixedly connected to the inside of the housing (1), a slide rail (22) being symmetrically fixedly connected to one side of the frame (21) in an upper and lower manner, and a plurality of guide grooves (211) being arranged in a fan-shaped manner on the frame (21); The connecting assembly (3) comprises a limiting vertical rod (31), the top and bottom ends of the limiting vertical rod (31) are respectively movably sleeved on two slide rails (22), a sleeve block (32) is movably sleeved on the outside of the limiting vertical rod (31), a T-shaped frame (33) that can slide in a guide groove (211) is fixedly connected to the sleeve block (32), and one end of the T-shaped frame (33) passes through the frame body (21) and extends to the other side of the frame body (21) to be fixedly connected to the nozzle (8); The frame body (21) is symmetrically and fixedly connected to a hydraulic rod (41) on one side away from the slide rail (22); the bottom of the hydraulic rod (41) is fixedly connected to an adjustment frame (42); and the middle part of the T-shaped frame (33) is sleeved inside the adjustment frame (42); A material storage box (52) is sleeved on the top of the limiting vertical rod (31); The limiting vertical rod (31) comprises a sleeve block (311) movably sleeved on the outside of the two slide rails (22), a column (312) is movably connected between the two sleeve blocks (311), and the sleeve block (32) is movably sleeved on the outside of the column (312); A limiting groove (313) is provided on the outside of the column (312); one end of the T-shaped frame (33) located inside the second sleeve block (32) is fixedly connected to a convex column (331) that can slide in the limiting groove (313); the upward movement of the T-shaped frame (33) can drive the convex column (331) to move upward along the bottom of the limiting groove (313); The storage box (52) is provided with a regulating component 1 (6) inside for regulating the flow of the material conveying component (5) when the connecting component (3) moves; The regulating component 1 (6) is used to separate the internal space of the material storage box (52) into a cavity 1 (521) and a cavity 2 (522) which are interconnected; The adjustment component 1 (6) comprises a disc 1 (61) fixedly connected to the inside of the material storage box (52) and movably sleeved on the outside of the column (312), and also comprises: A second disc (62) movably connected to the interior of the material storage box (52) and fixedly sleeved on the exterior of the column (312); The disc one (61) and the disc two (62) are coaxially assembled, and the disc one (61) and the disc two (62) are respectively provided with a through hole one (611) and a through hole two (621). Initially, the cavity one (521) is connected to the cavity two (522) through the through hole one (611) and the through hole two (621). When the column (312) rotates, it can drive the disc two (62) to rotate, and increase the connection portion between the through hole one (611) and the through hole two (621).

2. The injection molding device for producing thermal insulation materials according to claim 1, characterized in that: The material conveying assembly (5) comprises a pipe (51) having one end extending to the outside of the shell (1) and fixedly connected to the shell (1); a hose 1 (511) is equidistantly and fixedly connected to the pipe (51); the material storage box (52) is in contact with the frame (21) on the side facing the frame (21); a hose 2 (53) is also fixedly connected to the material storage box (52); one end of the hose 2 (53) passes through the guide groove 2 (212) and is connected to the nozzle (8).

3. The injection molding device for producing thermal insulation materials according to claim 2, characterized in that: The second hose (53) is connected to the second cavity (522), and the first cavity (521) is connected to the first hose (511).

4. The injection molding device for producing thermal insulation materials according to claim 3, characterized in that: The nozzle (8) is provided with a second regulating component (9) for regulating the injection pressure of the nozzle (8); The connecting component (3) is also provided with a transmission component (7), and the second adjustment component (9) and the connecting component (3) are connected in transmission via the transmission component (7).

5. The injection molding device for producing thermal insulation materials according to claim 4, characterized in that: The transmission assembly (7) comprises a transmission frame (72) movably sleeved on the outside of the column (312), a transmission belt (71) being arranged on the transmission frame (72), the transmission frame (72) further movably sleeved on the outside of the slide rail (22), and the transmission frame (72) movably sleeved in the guide groove three (213); The second adjustment component (9) comprises a stopper (91) movably connected to the inside of the nozzle (8), a connecting column (92) movably engaged at the top of the stopper (91), a top of the connecting column (92) extending upward to the outside of the nozzle (8), a spline being provided at a portion of the connecting column (92) located above the nozzle (8), and a sleeve (93) being movably sleeved outside the spline; The sleeve (93) is movably sleeved on an end of the transmission frame (72) away from the column (312), and the column (312) is transmission-connected to the sleeve (93) via a transmission belt (71); A second limiting groove (921) is provided on the connecting column (92), and a convex shaft (81) capable of sliding in the second limiting groove (921) is fixedly connected to the top of the nozzle (8); In the initial state, the convex shaft (81) is located at the top end of the second limiting groove (921).

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