PU free-washing high-speed head

Abstract

This application discloses a high-speed, self-cleaning PU head, relating to the field of polyurethane equipment technology. It includes: a valve base having a stirring channel, multiple feeding valve core mounting holes, multiple valve core drive control air passages, and a water-cooled annular cavity. The feeding valve core mounting holes communicate with the stirring channel, and the water-cooled annular cavity is connected through an inlet and an outlet water hole on the valve base; a stirring electric spindle coaxially connected to the valve base; a stirring shaft connected to the stirring electric spindle and penetrating the stirring channel, the stirring shaft being conical in shape, and maintaining a 0.5mm fit tolerance between the stirring shaft and the inner wall of the stirring channel; a spiral groove on the stirring shaft, the axial cross-section of which is triangular notch-shaped, with an acute-angled cutting edge on the side of the spiral groove near the small end of the stirring shaft; and a feed / retract control device located outside the valve base, connected to a material needle slidably inserted into the corresponding feeding valve core mounting hole. This application achieves self-cleaning through improvements to the stirring shaft, resulting in a self-cleaning effect.

Description

Technical Field

[0001] This application relates to the field of polyurethane production equipment technology, specifically to a high-speed PU production head that requires no cleaning. Background Technology

[0002] Polyurethane is a complex polymer compound formed by the bonding reaction of polyols and isocyanates. Due to its superior properties, it is now widely used in various industries. To meet the demand for producing products of different colors, polyurethane casting machines that can mix colors in the mixing chamber have emerged, such as the structures disclosed in CN2905406Y and CN204622370U. Using these two structures, there is no need for manual weighing of materials, which not only improves work efficiency but also reduces the waste of manpower and resources and the risk of measurement errors, resulting in more stable product performance.

[0003] However, in existing high-speed mixers, a certain amount of residue remains on the inner wall of the mixing chamber after a period of use. This residue not only affects the continuous processing of different products, leading to instability in the content of different materials in the products, but also requires the high-speed mixer to be cleaned before processing different types of products, making it impossible to continuously produce different types of products, thus increasing production time and costs. Utility Model Content

[0004] In view of this, this application provides a high-speed PU die head that does not require cleaning. Through unique design and structural optimization, it solves the problem of material residue in existing high-speed die heads, enables continuous production of different types of polyurethane products, improves production efficiency and product quality, and reduces production costs.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A high-speed, self-cleaning PU head, comprising:

[0007] The valve base has an axially penetrating stirring channel, multiple radially arranged feeding valve core mounting holes, multiple valve core drive control air passages connected to the feeding valve core mounting holes, and a water-cooled annular cavity. The feeding valve core mounting holes are connected to the stirring channel, and the water-cooled annular cavity is connected through a water inlet and a water outlet provided on the valve base.

[0008] A stirring electric spindle coaxially connected to the valve body;

[0009] The stirring shaft is connected to the stirring electric spindle and runs through the stirring channel. The stirring shaft is conical and cylindrical, and there is a 0.5mm fit tolerance between the stirring shaft and the inner wall of the stirring channel. The stirring shaft is provided with a spiral groove. The axial section of the spiral groove is triangular notch. The side of the spiral groove near the small end of the stirring shaft forms an acute-angle cutting edge, which is a conical double-thread design.

[0010] The feed and discharge control device is located on the outside of the valve body. The feed and discharge control device is connected to the material needle that is slidably inserted into the corresponding feeding valve core mounting hole, and controls the material needle to slide along the feeding valve core mounting hole to feed or discharge material.

[0011] Furthermore, the valve base includes a centering positioning plate, a mounting plate positioning plate, a main valve body, and a material injection water seat that are coaxially connected in sequence. The centering positioning plate has an inner conical hole, and the stirring electric spindle has a centering conical surface that mates with the inner conical hole. The material feeding valve core mounting hole is located on the main valve body, and the water cooling annular cavity, water inlet hole, and water outlet hole are all located on the material injection water seat.

[0012] Furthermore, the feed and discharge control device includes a linear drive module radially mounted on the main valve body and a scaffold hinged to the side of the linear drive module, with the two ends of the scaffold connected to the linear drive module and the corresponding feed needle, respectively.

[0013] Furthermore, the moving rod of the linear drive module has a scaffold access hole for inserting the corresponding end gap of the scaffold, and the feed needle has a scaffold inlet for inserting the corresponding end gap of the scaffold.

[0014] Furthermore, the linear drive module includes a cylinder body connected to the main valve body, a cylinder piston disposed in the cylinder chamber of the cylinder body, and a cylinder piston rod connected to the cylinder piston and extending outward. The jump plate access hole is disposed on the cylinder piston rod, and the cylinder chamber is connected to the control air source through the air supply channel.

[0015] Furthermore, the electric stirring spindle is connected to the stirring shaft via a tapered expansion sleeve assembly.

[0016] Furthermore, the conical expansion sleeve assembly includes an outer expansion sleeve connected to the stirring electric spindle and an inner conical sleeve disposed within the outer expansion sleeve. When the stirring electric spindle moves axially, it will cause the outer expansion sleeve and the inner conical sleeve to move relative to each other, causing the outer expansion sleeve to expand and clamp the stirring shaft.

[0017] Furthermore, the injection water seat includes an inner cone sleeve for stirring and an outer sleeve for injection water seat fitted outside the inner cone sleeve for stirring. The outer sleeve for injection water seat is connected to the main valve body and presses the inner cone sleeve for stirring against the main valve body. A water-cooled annular cavity is formed between the inner cone sleeve for stirring and the outer sleeve for injection water seat. The nut on the outer sleeve for injection water seat, which is connected to the outer sleeve for injection water seat, presses the PTFE gasket against the end faces of the inner cone sleeve for stirring and the outer sleeve for injection water seat. The PTFE gasket has an outlet for stirring water seat that mates with the stirring shaft.

[0018] Furthermore, a tangential plane is provided at the position of the stirring shaft near the mounting hole of the feeding valve core, and the tangential plane does not extend to the two end faces of the stirring shaft.

[0019] As can be seen from the above technical solution, the advantages of this utility model are:

[0020] Innovative Mixing Shaft Design: The mixing shaft adopts a conical double-spiral structure. Its taper design follows fluid mechanics principles, maintaining a precise tolerance of only 0.5mm between the mixing shaft and the inner wall of the mixing channel. The double-spiral thread consists of a main and auxiliary spiral. The main spiral mixes and conveys the material, while the auxiliary spiral rotates in the opposite direction to generate vortexes that scour the inner wall. During mixing, centrifugal force and spiral propulsion cause the material to move in three dimensions. The combined effect of spiral cutting edge scraping and vortex scouring, along with the conical profile of the mixing shaft, achieves thorough cleaning of the inner wall of the channel, significantly reducing material residue, improving mixing uniformity, and reducing maintenance costs. Furthermore, through the adaptive adjustment of the spiral structure, thorough cleaning of the inner wall can be achieved without cleaning the high-speed head, enabling continuous production of different types of polyurethane products, thus improving production efficiency and product quality.

[0021] Water cooling system optimization: The water-cooled annular cavity in the valve body, along with the matching inlet and outlet ports, forms an efficient water circulation system. During equipment operation, the water cooling system effectively reduces the temperature of the valve body, ensuring stable operation at a suitable temperature, mitigating the impact of thermal expansion on equipment failure and performance degradation, and extending the equipment's service life.

[0022] Precise material feeding and unloading control: The material feeding and unloading control device adopts a mechanical transmission structure combining a linear drive module and a sled. The up-and-down movement of the cylinder piston drives the sled to pry open the material needle, achieving precise control over the feeding and unloading of the material needle. This control method is simple and reliable, and can accurately control the injection and stopping of materials according to production needs, improving production stability and product quality. Attached Figure Description

[0023] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an undue limitation of this application.

[0024] Figure 1 This is an isometric view of the present invention.

[0025] Figure 2 This is the front view of the present invention.

[0026] Figure 3 For the present utility model Figure 2 The AA square section view in the image.

[0027] Figure 4 for Figure 3 A magnified view of a portion of the image.

[0028] Figure 5 This is a schematic diagram of the structure of the stirring shaft of this utility model.

[0029] Figure 6 for Figure 3A magnified view of section B.

[0030] Figure 7 This is a partial sectional view of the pneumatic device.

[0031] Figure 8 for Figure 3 A magnified view of part D.

[0032] Figure 9 for Figure 3 A CC-shaped cross-sectional view.

[0033] Explanation of reference numerals in the attached drawings: 1-Agitating electric spindle; 2-Feed / retractable material control device; 3-Main valve body; 13-Multi-sided valve body; 131-Pneumatic inlet channel; 12-Small-sided valve body; 301-First agitating chamber; 4-Injection water seat; 401-Second agitating chamber; 5-Cylinder body; 501-Airflow channel; 502-Mounting hole; 503-Cylinder chamber; 6-Cylinder piston rod; 601-Scoop plate inlet hole; 7-Scoop plate; 8-Material needle ; 801-Scooping board inlet; 802-Compression spring; 9-Copper sleeve; 10-Cylinder piston; 101-Conical expansion sleeve assembly; 102-Inner conical sleeve; 103-Outer expansion sleeve; 11-Cornering positioning plate; 14-Agitator shaft; 15-Agitator inner lining conical sleeve; 16-Injection water seat outer sleeve; 161-Water inlet; 162-Water outlet; 17-PTFE gasket; 171-Agitator water seat outlet; 18-Water seat outer sleeve nut; 19-Mounting plate positioning. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the embodiments and accompanying drawings. Here, the illustrative embodiments and their descriptions are used to explain this application, but are not intended to limit it.

[0035] refer to Figures 1 to 9 ,like Figure 1 , Figure 2 , Figure 3As shown in the figure, this embodiment provides a high-speed PU self-cleaning head, including a valve base, a stirring electric spindle 1, a stirring shaft 14, and a feeding / unfeeding control device 2. The valve base has an axially penetrating stirring channel, multiple radially arranged feeding valve core mounting holes, multiple valve core drive control air passages connected to the feeding valve core mounting holes, and a water-cooled annular cavity 402. The feeding valve core mounting holes are connected to the stirring channel, facilitating the addition of various materials for stirring to form corresponding products. The water-cooled annular cavity 402 is connected through a water inlet hole 161 and a water outlet hole 162 provided on the valve base. Water flows into the cavity through the water inlet hole 161 and then flows out from the water outlet hole 162, forming... A good water circulation system can cool the valve body, ensuring that the equipment operates at a suitable temperature, improving the stability and service life of the equipment; the stirring electric spindle 1 is coaxially connected to the valve body; the stirring shaft 14 is connected to the stirring electric spindle 1 and passes through the stirring channel. The stirring electric spindle 10 drives the stirring shaft 14 to rotate, stirring and mixing the material in the stirring channel. The stirred material is discharged from the outlet end of the stirring channel; the feeding and unloading control device 2 is located on the outside of the valve body. The feeding and unloading control device 2 is connected to the material needle 8 that is slidably inserted into the corresponding feeding valve core mounting hole, controlling the material needle 8 to slide along the feeding valve core mounting hole to feed or unload material.

[0036] In this application, the valve base includes a centering positioning plate 11, a mounting plate positioning 19, a main valve body 3, and a material injection water seat 4, which are coaxially connected in sequence. During use, the centering positioning plate 11 is connected to a fixed structure, allowing the entire assembly to be installed around the mounting positioning plate 19 and the centering positioning plate 11. The centering positioning plate 11 has an inner conical hole, and the stirring electric spindle 1 has a centering conical surface that mates with the inner conical hole. This design ensures the coaxiality of the stirring electric spindle 1 and the valve base, reducing vibration and deviation during operation and improving the stability and uniformity of stirring. The material injection valve core mounting hole is located on the main valve body 3. Figure 9 As shown, the water-cooled annular cavity 402, the water inlet hole 161 and the water outlet hole 162 are all set on the filling water base 4. The segmented design not only facilitates processing, but also makes it easy to maintain and replace local parts.

[0037] Specifically, the main valve body 3 has a first stirring chamber 301 at its center, and the filling water seat 4 has a second stirring chamber 401 at its center that communicates with the filling water seat 4. The second stirring chamber 401 and the first stirring chamber 301 are combined to form a stirring channel. The main valve body 3 includes a multi-sided valve body 13 and a small multi-sided valve body 12 arranged coaxially. The multi-sided valve body 13 is connected to the mounting plate positioning 19, and the filling water seat 4 is connected to the filling water seat 4. The feeding valve core mounting hole is located on the corresponding outer plane of the small multi-sided valve body 12. Each side plane of the multi-sided valve body 13 is provided with a valve core drive control air passage interface. This further split structure design makes the channel processing in the valve body more convenient and facilitates the assembly and maintenance of the equipment.

[0038] In this application, the stirring shaft 14 is conical, and a 0.5mm fit tolerance is maintained between the stirring shaft 14 and the inner wall of the stirring channel. This precise tolerance design can ensure the smooth rotation of the stirring shaft 14 and reduce the residue of material between the stirring shaft 14 and the inner wall of the stirring channel. The stirring shaft 14 is provided with a spiral groove, and the axial section of the spiral groove is triangular notch, so that the side of the spiral groove near the small end of the stirring shaft 14 forms an acute-angle cutting edge, making the stirring shaft 14 a conical double-thread design. During the mixing process, centrifugal force, spiral propulsion, and the reverse resistance of the sharp-angled blades cause the material to move forward in a three-dimensional shape. Through the conveying of the conical channel, the material is squeezed during its forward movement, increasing the scouring force between the material and the inner wall of the mixing channel. Under the mixing of centrifugal force and the reverse resistance of the sharp-angled blades, the material forms a vortex that scours the inner wall. The mixing shaft 14 and the precision disc of the mixing channel scrape the inner wall of the mixing channel. During operation, when the mixing shaft 14 rotates at high speed, the residual material adhering to the inner wall of the mixing channel is peeled off under the dual action of scraping by the spiral blades and scouring by the vortex, achieving a thorough cleaning of the inner wall of the channel, significantly reducing the material residue rate on the inner wall, improving the mixing uniformity, and reducing maintenance costs, thereby achieving a cleaning-free effect.

[0039] In this application, such as Figure 5 As shown, a tangential plane 141 is provided near the feeding hole of the stirring shaft 14, and the tangential plane 141 does not extend to the two end faces of the stirring shaft 14. The setting of the tangential plane increases the material capacity at the discharge port of the feeding hole, which can facilitate the rapid and sufficient addition of materials, making the mixing and stirring work efficient. Even under high-speed operation, the material content can be guaranteed, and the uniformity of the stirring of materials in the subsequent forward process will not be affected.

[0040] To achieve automated feeding and unloading of the material bar, the feeding and unloading control device 2 includes a linear drive module radially disposed on the main valve body 3 and a jump plate 7 hinged to the side of the linear drive module. The two ends of the jump plate 7 are respectively connected to the linear drive module and the corresponding material needle 8. The number of jump plates 7 is determined according to the number of material needles. In this application, the jump plates 7 are preferably two and symmetrically disposed on both sides of the linear drive module.

[0041] Specifically, the moving rod of the linear drive module has a spring plate access hole 601 for inserting the corresponding end gap of the spring plate 7, and the tail end of the needle 8 has a spring plate inlet 801 for inserting the corresponding end gap of the spring plate 7. By using the form of hole-shaft clearance fit, the swing motion can be converted into linear motion and no jamming will occur.

[0042] In this application, the main valve body 3 is also provided with an external sleeve that slides with the needle 8. The sleeve can be detached by screws. Inside the sleeve is a compression spring 802 that is fitted on the needle 8 and drives the needle 8 to move inward. The needle 8 is in the shape of a two-stage step, and a shoulder is formed at the diameter change point that abuts against the compression spring 802.

[0043] In this application, such as Figure 2 , Figure 3 , Figure 6 and Figure 7 As shown, the linear drive module includes a cylinder body 5 connected to the main valve body 3, a cylinder piston 10 disposed in the cylinder chamber 503 of the cylinder body 5, and a cylinder piston rod 6 connected to the cylinder piston 10 and extending outward. A copper sleeve 9 is provided between the cylinder piston rod 6 and the cylinder body 5. The copper sleeve 9 can reduce the friction between the cylinder piston rod 6 and the cylinder body 5 and extend the service life of the equipment. The jump plate access hole 601 is provided on the cylinder piston rod 6. The cylinder chamber 503 is connected to the control air source through the air supply channel. The cylinder body 5 is provided with a mounting hole 502 for the jump plate 7 to be hinged. The air supply channel includes a pneumatic access channel 131 disposed on the multi-sided valve body 13 and an airflow channel 501 disposed on the cylinder body 5. The two ends of the airflow channel 501 are connected to the pneumatic access channel 131 and the cylinder chamber 503, respectively. The outer opening of the pneumatic access channel 131 is connected to the control air source. When the airflow is switched by controlling the solenoid valve, the airflow is not supplied by the control air source. When the gas enters the cylinder chamber 503 through the air passage and the gas in the cylinder chamber 503 is discharged along the air supply passage, the material needle 8 is injected under the elastic thrust of the compression spring 802. The jumper inlet 801 drives the other side of the jumper 7, using the mounting hole 502 as a fixed fulcrum to pry the other side of the jumper inlet 601, causing the cylinder piston rod 6 to move upward, thereby driving the cylinder piston 10 to move upward. When the airflow enters the cylinder chamber 503 through the air supply passage by controlling the switching of the solenoid valve, the cylinder piston 10 and cylinder piston rod 6 in the cylinder body 5 move downward. When the cylinder piston rod 6 moves downward, the jumper inlet 601 drives the other side of the jumper 7, using the mounting hole 502 as a fixed fulcrum to pry the other side of the jumper inlet 801 to pull out the material needle 8. This controls the injection and stop of the material needle 8 into the main valve body 3. The mechanical transmission structure of the pneumatic connecting rod device 2 and the compression spring 802 effectively controls the injection and stop of the material needle 8 into the main valve body 3.

[0044] To facilitate the assembly and disassembly of the electric stirring spindle 1, the electric stirring spindle 1 is connected to the stirring shaft 14 via a tapered expansion sleeve assembly 101. The specific structure of the tapered expansion sleeve assembly 101 can be based on the structure in the prior art.

[0045] In this application, to make the conical expansion sleeve assembly 101 simple in structure and easy to use, such as Figure 4As shown, the conical expansion sleeve assembly 101 includes an outer expansion sleeve 103 connected to the stirring electric spindle 1 and an inner conical sleeve 102 disposed inside the outer expansion sleeve 103. In use, the stirring shaft 14 is first inserted into the valve body from the end closest to the stirring electric spindle 1, and then the stirring electric spindle 1 with the conical expansion sleeve assembly 101 installed is inserted and the stirring electric spindle 1 is limited and placed to separate. After the stirring electric spindle 1 is connected to compressed air, an axial thrust is generated. When the stirring electric spindle 1 moves axially, the force is transmitted to the outer expansion sleeve 103, causing the outer expansion sleeve 103 and the inner conical sleeve 102 to move relative to each other. Under the action of the radial component force of the conical surface, the outer expansion sleeve 103 undergoes elastic deformation and expands to hug the stirring shaft 14 and achieve a connection, forming a high-strength keyless connection, ensuring that the stirring shaft 14 remains stable under high-speed rotation. During disassembly, compressed air is introduced in reverse, and the outer expansion sleeve 103 quickly resets under the action of elastic restoring force, achieving easy separation of the stirring shaft 14 from the stirring electric spindle 1. This structure, through non-contact pneumatic control, avoids damage to the shaft surface caused by traditional mechanical clamping methods, while significantly improving equipment maintenance efficiency, greatly shortening disassembly and assembly time, and effectively reducing downtime maintenance costs. The stirring electric spindle 1 is connected to the drive gear, sprocket, or pulley of the transmission mechanism through the guide of the shaft key, allowing the stirring electric spindle 1 to move axially. It can stably drive rotation. The stirring electric spindle 1 includes an outer shaft cylinder and an inner shaft core. The outer shaft cylinder is hinged to the corresponding base and connected to the rotation transmission mechanism. The inner shaft core is slidably disposed on the outer shaft cylinder along the axial direction. The inner shaft core rotates synchronously with the outer shaft cylinder. The inner shaft core is connected to the outer expansion sleeve 103 and has a piston core that cooperates with the outer shaft cylinder. The outer shaft cylinder is provided with an air source inlet hole. By supplying air to the inner cavity of the outer shaft cylinder on different sides of the piston core, the movement direction of the piston core is controlled, thereby controlling the movement direction of the inner shaft core.

[0046] In this application, such as Figure 8As shown, the injection water seat 4 includes an inner conical sleeve 15 for stirring and an outer sleeve 16 for injection water seat 16 fitted outside the inner conical sleeve 15. The outer sleeve 16 is connected to the main valve body 3 and presses the flange plate of the inner conical sleeve 15 against the limiting groove of the main valve body 3, so that the inner conical sleeve 15 is stably limited. A water-cooled annular cavity 402 is formed between the inner conical sleeve 15 and the outer sleeve 16. The inlet hole 161 and the outlet hole 162 are located on the side wall of the outer sleeve 16. The water seat outer sleeve nut 18 connected to the outer sleeve 16 presses the PTFE gasket 17 against the end faces of the inner conical sleeve 15 and the outer sleeve 16 to improve the sealing at the joint of the inner conical sleeve 15 and the outer sleeve 16, preventing the water-cooled annular cavity 402 from being sealed. To prevent water leakage, the PTFE gasket 17 has a mixing water seat outlet 171 that mates with the mixing shaft 14. The mixed material is squeezed out from the mixing water seat outlet 171. The use of the PTFE gasket 17 also allows for adjustment of the size of the discharge ring by replacing the PTFE gasket 17. The use of the water seat outer nut 18 makes it easy to replace the PTFE gasket 17 to ensure the stability of the discharge ring.

[0047] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to the embodiments of this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A high-speed PU self-cleaning head, characterized in that, include: The valve base has an axially penetrating stirring channel, a plurality of radially arranged feeding valve core mounting holes, a plurality of valve core drive control air passages connected to the feeding valve core mounting holes, and a water-cooled annular cavity (402). The feeding valve core mounting holes are connected to the stirring channel, and the water-cooled annular cavity (402) is connected through a water inlet (161) and a water outlet (162) provided on the valve base. A stirring electric spindle (1) is coaxially connected to the valve body. A stirring shaft (14) is connected to the stirring electric spindle (1) and passes through the stirring channel. The stirring shaft (14) is conical and has a 0.5mm fit tolerance between the stirring shaft (14) and the inner wall of the stirring channel. A spiral groove is provided on the stirring shaft (14). The axial section of the spiral groove is triangular notch. The side of the spiral groove near the small end of the stirring shaft (14) forms an acute-angle cutting edge and has a conical double-thread design. The feed and discharge control device (2) is located on the outside of the valve body. The feed and discharge control device (2) is connected to the material needle (8) which is slidably inserted into the corresponding feeding valve core mounting hole. The material needle (8) controls the material needle (8) to slide along the feeding valve core mounting hole to feed or discharge material.

2. The high-speed, non-cleaning PU head according to claim 1, characterized in that, The valve base includes a centering positioning plate (11), a mounting plate positioning plate (19), a main valve body (3), and a material injection water seat (4) connected coaxially in sequence. The centering positioning plate (11) has an inner conical hole. The stirring electric spindle (1) has a centering conical surface that mates with the inner conical hole. The feeding valve core mounting hole is located on the main valve body (3). The water-cooled annular cavity (402), the water inlet (161), and the water outlet (162) are all located on the material injection water seat (4).

3. The high-speed, non-cleaning PU head according to claim 2, characterized in that, The feed and discharge control device (2) includes a linear drive module arranged radially on the main valve body (3) and a jump plate (7) hinged to the side of the linear drive module. The two ends of the jump plate (7) are respectively connected to the linear drive module and the corresponding feed needle (8).

4. The high-speed, non-cleaning PU head according to claim 3, characterized in that, The linear drive module has a springboard access hole (601) on its moving rod for inserting the corresponding end gap of the springboard (7), and the feed needle (8) has a springboard inlet (801) for inserting the corresponding end gap of the springboard (7).

5. The high-speed, non-cleaning PU head according to claim 4, characterized in that, The linear drive module includes a cylinder body (5) connected to the main valve body (3), a cylinder piston (10) disposed in the cylinder chamber (503) of the cylinder body (5), and a cylinder piston rod (6) connected to the cylinder piston (10) and extending outward. The jump plate access hole (601) is disposed on the cylinder piston rod (6), and the cylinder chamber (503) is connected to the control air source through the air supply channel.

6. The high-speed, non-cleaning PU head according to claim 1, characterized in that, The electric stirring spindle (1) is connected to the stirring shaft (14) via a tapered expansion sleeve assembly (101).

7. The high-speed, self-cleaning PU head according to claim 6, characterized in that, The conical expansion sleeve assembly (101) includes an outer expansion sleeve (103) connected to the stirring electric spindle (1) and an inner conical sleeve (102) disposed in the outer expansion sleeve (103). When the stirring electric spindle (1) moves axially, it will cause the outer expansion sleeve (103) and the inner conical sleeve (102) to generate relative movement, causing the outer expansion sleeve (103) to expand and clamp the stirring shaft (14).

8. The high-speed, non-cleaning PU head according to claim 2, characterized in that, The injection water seat (4) includes an inner cone sleeve (15) for stirring and an outer sleeve (16) for injection water seat sleeve (16) sleeved on the outside of the inner cone sleeve (15). The outer sleeve (16) for injection water seat sleeve (16) is connected to the main valve body (3) and presses the inner cone sleeve (15) against the main valve body (3). A water-cooled annular cavity (402) is formed between the inner cone sleeve (15) for stirring and the outer sleeve (16) for injection water seat sleeve (16). The nut (18) for injection water seat sleeve (16) connected to the outer sleeve (16) for injection water seat sleeve (17) presses the PTFE gasket (17) against the end faces of the inner cone sleeve (15) for stirring and the outer sleeve (16) for injection water seat sleeve (17). The PTFE gasket (17) has an outlet (171) for stirring water seat sleeve (171) that cooperates with the stirring shaft (14).

9. The high-speed, non-cleaning PU head according to claim 1, characterized in that, The stirring shaft (14) has a tangential plane (141) at a position near the feeding valve core mounting hole, and the tangential plane (141) does not extend to the two end faces of the stirring shaft (14).

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