Foaming machine head

Abstract

The invention belongs to the technical field of foaming machines, and provides a foaming machine head, which comprises: a mixing block, which is internally provided with a mixing cavity; the spray pipe is arranged on the mixing block, and the interior of the spray pipe communicates with the mixing cavity; the material pushing oil cylinder is arranged on the mixing block, a piston rod of the material pushing oil cylinder is movably inserted into the spraying pipe and used for removing excess materials on the inner wall of the spraying pipe, and the connecting part of the mixing cavity and the spraying pipe is located on the moving path of the piston rod and used for controlling the opening degree of the connecting part; the adjusting part is connected to the material pushing oil cylinder, one end of the adjusting part extends into the material pushing oil cylinder and movably abuts against the piston rod, and the adjusting part is used for adjusting the retraction position of the piston rod after the piston rod retracts into the material pushing oil cylinder. Compared with the prior art, the adjusting piece is used for adjusting the reset position of the piston rod of the material pushing oil cylinder after retraction, the opening degree of the connecting part is controlled, and therefore the purpose of adjusting the pressure when foaming raw materials are mixed is achieved. Therefore, foaming raw materials can be fully mixed, and the quality of foaming parts is further ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of foaming machines, and in particular relates to a foaming machine head. Background Art

[0002] The head of the foaming machine is one of the key components of the foaming equipment. It is mainly used to mix chemical raw materials (such as polyurethane, phenolic resin, etc.) in a certain proportion and speed, and then spray or extrude them in the form of foam through a specific outlet. This process usually involves a chemical reaction, which causes the raw materials to expand and form a foam structure when passing through the head. In today's industrial production field, foaming machines are widely used in key industries such as building insulation material manufacturing, packaging material production, and automobile seat manufacturing. The performance of the head is directly related to product quality and production efficiency. As the core component of the foaming machine, the performance of the head plays a decisive role.

[0003] However, the traditional die has obvious defects. The mixing method of the traditional die is relatively simple and cannot achieve full fusion of liquid raw materials and gas raw materials, resulting in uneven foaming and large fluctuations in product quality. In high-end application scenarios with strict requirements on foaming quality, such as the production of high-end building insulation materials, this problem seriously restricts the improvement of product performance and the enhancement of market competitiveness.

[0004] Furthermore, after the foaming operation is completed, the residual raw materials are very likely to adhere to the foaming cavity wall inside the die. Since the die is an integrated structure with a small internal space and complex structure, it is difficult for conventional cleaning tools to reach every corner, making the cleaning work difficult. This will not only cause the residual raw materials to gradually solidify, seriously affecting the quality stability of subsequent foaming operations, but may also cause pipeline blockage, greatly increasing equipment maintenance costs and downtime, thereby reducing production efficiency. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a foaming machine head in view of the current status of the prior art.

[0006] The technical solution adopted by the present invention to solve the above technical problems is: a foaming machine head is provided, comprising: a mixing block, in which a mixing chamber is arranged, and the mixing chamber is used for mixing foaming raw materials; A nozzle, which is arranged on the mixing block, and the interior of the nozzle is communicated with the mixing chamber; A push cylinder is arranged on the mixing block, and a piston rod of the push cylinder is movably inserted in the nozzle to remove the residual material on the inner wall of the nozzle, and the connection part between the mixing chamber and the nozzle is located on the moving path of the piston rod to control the opening size of the connection part; An adjusting member is connected to the pushing cylinder, one end of which extends into the pushing cylinder and movably abuts against the piston rod, so as to adjust the retracted position of the piston rod after it is retracted into the pushing cylinder.

[0007] In the above-mentioned foaming machine head, the pushing cylinder includes a cylinder body and an end cover connected to the cylinder body, and the adjusting member is threadedly connected to the end cover so that when the adjusting member rotates, the adjusting member extends into one end of the pushing cylinder and moves toward the direction of the piston rod.

[0008] In the above-mentioned foaming machine head, the adjusting member includes a limiting member, a plurality of first limiting grooves are arranged on the outer wall of the end cover at intervals along its circumference, and a plurality of second limiting grooves are arranged on the outer wall of the adjusting member at intervals along its circumference, at least one of the first limiting groove and the second limiting groove is connected, and the limiting member is inserted in the connected first limiting groove and the second limiting groove.

[0009] In the above-mentioned foaming machine head, the adjusting member is provided with a threaded hole, and the limiting member is provided with a bolt through hole. The bolt passes through the bolt through hole and is connected in the threaded hole, so that the limiting member is connected to the adjusting member.

[0010] In the above-mentioned foaming machine head, a connecting sleeve is arranged between the pushing cylinder and the mixing block, a cavity is arranged in the connecting sleeve, the piston rod is movably inserted in the cavity, and a window communicating with the cavity is arranged on the side wall of the connecting sleeve, and the window is used to expose the piston rod to the outside.

[0011] In the above-mentioned foaming machine head, the mixing block has a length direction, a width direction and a height direction, and includes: a first channel, which penetrates the mixing block along the height direction, and one end of the piston rod is movably inserted in the first channel; A second channel, which penetrates the mixing block along the width direction and is connected to the first channel, and the intersection of the first channel and the second channel forms the mixing chamber; Inlet channels are disposed on both sides of the second channel and communicated with the second channel, one end of each of the two inlet channels passes through one end of the mixing block along the length direction, and are used to introduce gas into the second channel; two feed channels disposed on both sides of the second channel and connected to the air inlet channel on the same side of the second channel; two discharge channels disposed on both sides of the second channel and connected to the second channel; A control rod, which is movably inserted in the second channel and has a material injection position and a material return position; When the control rod is in the injection position, the end of the control rod is located between the air inlet channel and the discharge channel, so that the air inlet channel and the discharge channel are isolated and the two air inlet channels are connected to each other; When the control rod is in the return position, the end of the control rod is located between the air inlet channel and the first channel, so that the two air inlet channels are isolated and the air inlet channel and the discharge channel on the same side of the second channel are connected.

[0012] In the above-mentioned foaming machine head, connecting grooves are provided on both sides of the control rod along the axial direction, and the width of the connecting grooves along the axial direction of the control rod is greater than the distance between the discharge channel and the intersection of the air inlet channel and the second channel, so as to connect the air inlet channel and the discharge channel on the same side of the second channel when the control rod is in the return position.

[0013] In the above-mentioned foaming machine head, the end of the control rod is arc-shaped, so that when the control rod is in the material return position, the end of the control rod moves out of the moving path of the piston rod.

[0014] In the above-mentioned foaming machine head, a driving member is provided on the mixing block, and the control rod is connected to the output end of the driving member to drive the control rod to move in the second channel.

[0015] In the above-mentioned foaming machine head, the mixing block and the connecting sleeve, as well as the driving member and the mixing block are all detachably connected.

[0016] Compared with the prior art, the present invention has the following beneficial effects: (1) The adjustment part is used to adjust the reset position of the piston rod of the push cylinder after it is retracted, and the opening size of the connection part is controlled, so as to achieve the purpose of adjusting the pressure when the foaming raw materials are mixed. This can ensure that the foaming raw materials are fully mixed, thereby ensuring the quality of the foamed parts.

[0017] (2) The setting of the limiter is used to fix the adjustment member and the end cover of the push cylinder together after adjusting the retraction position of the piston rod, so as to ensure the normal operation of the foaming machine head during the foaming process.

[0018] (3) The design of the connecting sleeve and its upper window facilitates the cleaning of the residual material adhering to the piston rod, thereby ensuring the normal foaming process of the foamed parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional diagram of a foaming machine head of the present invention; Figure 2 It is a cross-sectional view of a foaming machine head of the present invention; Figure 3 It is a stereogram of the control lever; Figure 4 is a cross-sectional view of the mixing block; Figure 5 It is a schematic diagram of the structure when the control lever is in the material return position; Figure 6 It is a schematic diagram of the structure when the control rod is in the injection position; Figure 7 is a stereogram of the end cap; Figure 8 It is a three-dimensional diagram of the partial structure of the adjusting part.

[0020] In the figure, L is the length direction; W is the width direction; H is the height direction; 100 is the mixing block; 110 is the mixing chamber; 120 is the first channel; 130 is the second channel; 140 is the air inlet channel; 150 is the feed channel; 160 is the control rod; 161 is the connecting groove; 170 is the discharge channel; 200 is the nozzle; 300 is the push cylinder; 310 is the piston rod; 320 is the cylinder body; 330 is the end cover; 331 is the first limiting groove; 400 is the adjusting member; 410 is the limiting member; 411 is the bolt through hole; 420 is the second limiting groove; 430 is the threaded hole; 500 is the driving member; 600 is the connecting sleeve; 610 is the window. DETAILED DESCRIPTION

[0021] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0022] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0023] like Figures 1 to 8 As shown, a foaming machine head of the present invention includes: a mixing block 100, a nozzle 200, a pushing cylinder 300, and an adjusting member 400.

[0024] Specifically, a mixing chamber 110 is provided in the mixing block 100, and the mixing chamber 110 is used for mixing foaming raw materials; the nozzle 200 is placed on the mixing block 100, and the interior of the nozzle 200 is connected to the mixing chamber 110; the pushing cylinder 300 is provided on the mixing block 100, and the piston rod 310 of the pushing cylinder 300 is movably inserted in the nozzle 200 to remove the residual material on the inner wall of the nozzle 200, and the connecting part of the mixing chamber 110 and the nozzle 200 is located on the moving path of the piston rod 310 to control the opening size of the connecting part; the adjusting member 400 is connected to the pushing cylinder 300, and one end of the adjusting member 400 extends into the pushing cylinder 300 and movably abuts against the piston rod 310, so as to adjust the retracted position of the piston rod 310 after it is retracted into the pushing cylinder 300.

[0025] Before the foaming operation begins, it is necessary to adjust the length of one end of the adjusting member 400 extending into the pushing cylinder 300, so as to control the distance of the piston rod 310 retracting, thereby changing the position of the piston rod 310 inserted into one end of the mixing block 100 after retracting into the pushing cylinder 300. After the adjustment is completed, when the piston rod 310 is completely retracted into the pushing cylinder 300, it is necessary to ensure that the portion of the piston rod 310 end overlapping with the connecting portion is appropriate, so as to achieve the purpose of adjusting the opening size of the connecting portion. During the working process, the foaming raw materials (such as polyurethane, phenolic resin) are fully mixed in the mixing chamber 110 and then introduced into the nozzle 200, and then enter the foaming mold from the nozzle 200. If the opening of the connecting portion is reduced to about two-thirds of the original size, the pressure of the mixture entering the nozzle 200 from the mixing chamber 110 will increase, so that the foaming raw materials are mixed more evenly, the consistency of the foaming effect is improved, and the fluctuation of product quality is reduced.

[0026] For foam parts with different performance requirements (such as hardness requirements), the ratio of foaming raw materials will also be different. Different foaming raw material ratios require different pressures to achieve full mixing. This solution adapts to these changes by adjusting the position of the piston rod 310, so that the foaming machine head can respond to the needs of different foam parts more quickly.

[0027] After a foaming operation is completed, the mixing chamber 110 and the nozzle 200 are isolated. At this time, the push cylinder 300 drives the piston rod 310 forward to push out the remaining mixed material in the nozzle 200 to keep the nozzle 200 clean and prevent blockage, thereby ensuring the quality stability of the next foaming operation.

[0028] Reference Figure 1 , Figure 2 , Figure 7 and Figure 8The pushing cylinder 300 includes a cylinder body 320 and an end cover 330 connected to the cylinder body 320 , and the adjusting member 400 is threadedly connected to the end cover 330 so that when the adjusting member 400 rotates, the adjusting member 400 extends into one end of the pushing cylinder 300 and moves toward the piston rod 310 .

[0029] The threaded connection between the adjusting member 400 and the end cover 330 can be achieved by providing a threaded hole 430 on the end cover 330 and providing an external thread matched with the threaded hole 430 on the outer side of the adjusting member 400, as shown in FIG. Figure 2 (At this time, the end of the adjusting member 400 extends to the deepest part of the pushing cylinder 300). When the adjusting member 400 is rotated, the threaded connection between the adjusting member 400 and the end cover 330 causes the adjusting member 400 to move to the bottom of the cylinder 300. Figure 2 Move upward, thereby gradually increasing the opening of the connection.

[0030] The structure of the cylinder body 320 and the piston rod 310 of the regulating cylinder and how the oil circuit design drives the piston rod 310 to move relative to the cylinder body 320 are no different from those of ordinary cylinders and will not be described in detail here.

[0031] During the foaming process, the foaming raw materials are injected into the mixing chamber 110 by the high pressure generated by the foaming machine. After the primary material process is completed, when the high pressure stops, the head of the foaming machine will vibrate. This vibration may cause the adjustment member 400 to rotate relative to the push cylinder 300, thereby changing the retracted position of the piston rod 310 in the push cylinder 300. This change will affect the mixing pressure of the foaming raw materials, resulting in unstable quality of the foamed parts.

[0032] In order to solve the above problems, in this solution, the adjusting member 400 includes a limiting member 410, a plurality of first limiting grooves 331 are arranged on the outer wall of the end cover 330 at intervals along its circumference, and a plurality of second limiting grooves 420 are arranged on the outer wall of the adjusting member 400 at intervals along its circumference, at least one of the first limiting grooves 331 and the second limiting groove 420 is connected, and the limiting member 410 is inserted in the connected first limiting grooves 331 and the second limiting grooves 420.

[0033] When adjusting the retracted position of the piston rod 310 by rotating the adjusting member 400, the limiting member 410 needs to be removed from the adjusting member 400. At this time, without the restriction of the limiting member 410, the adjusting member 400 can rotate freely relative to the cylinder body 320 when subjected to force. After adjusting the position of the adjusting member 400 relative to the cylinder body 320, the limiting member 410 is reinserted into the aligned first limiting groove 331 and the second limiting groove 420, so that the adjusting member 400 and the cylinder body 320 remain fixed.

[0034] Furthermore, in order to prevent the vibration of the foaming machine from causing the limit member 410 to separate from the adjusting member 400, in this solution, a threaded hole 430 is provided on the adjusting member 400, and a bolt through hole 411 is provided on the limit member 410. The bolt passes through the bolt through hole 411 and is connected in the threaded hole 430, so that the limit member 410 is connected to the adjusting member 400.

[0035] Reference Figure 1 and Figure 2 A connecting sleeve 600 is provided between the pushing cylinder 300 and the mixing block 100. A cavity is provided in the connecting sleeve 600. The piston rod 310 is movably inserted in the cavity. A window 610 communicating with the cavity is provided on the side wall of the connecting sleeve 600. The window 610 is used to expose the piston rod 310 to the outside.

[0036] When the pushing cylinder 300 drives the piston rod 310 to be inserted into the nozzle 200 and pushes the material attached to the inner wall of the nozzle 200 away from the nozzle 200, part of the material will adhere to the piston rod 310. The setting of the window 610 on the connecting sleeve 600 is conducive to the operator using tools such as an air gun to remove the material adhered to the piston rod 310, thereby ensuring the normal progress of the foaming operation.

[0037] In this solution, the mixing block 100 has a length direction L, a width direction W and a height direction H, and includes: a first channel 120, which penetrates the mixing block 100 along the height direction H, and one end of the piston rod 310 is movably inserted in the first channel 120; a second channel 130, which penetrates the mixing block 100 along the width direction W and is connected to the first channel 120, and the intersection of the first channel 120 and the second channel 130 forms a mixing chamber 110; intake channels 140 arranged on both sides of the second channel 130 and connected to the second channel 130, one end of the two intake channels 140 penetrates one end of the mixing block 100 along the length direction L, and is used to introduce gas into the second channel 130; intake channels 140 arranged on both sides of the second channel 130 and on the same side of the second channel 130 Two feed channels 150 connected to the channel 140; two discharge channels 170 arranged on both sides of the second channel 130 and connected to the second channel 130; a control rod 160, which is movably inserted in the second channel 130 and has an injection position and a return position; when the control rod 160 is in the injection position, the end of the control rod 160 is located between the air inlet channel 140 and the discharge channel 170, so that the air inlet channel 140 and the discharge channel 170 are isolated, and the two air inlet channels 140 are connected to each other; when the control rod 160 is in the return position, the end of the control rod 160 is located between the air inlet channel 140 and the first channel 120, so that the two air inlet channels 140 are isolated, and the air inlet channel 140 and the discharge channel 170 on the same side of the second channel 130 are connected.

[0038] One end of the air inlet channel 140 is connected to an air source to provide power for injecting the foaming raw material into the mixing chamber 110 and introducing it into the nozzle 200. Figure 4 and Figure 5 At this time, the end of the control rod 160 is located between the air inlet channel 140 and the first channel 120, so that the air inlet channel 140 is isolated from the first channel 120, and the air inlet channel 140 is connected to the discharge channel 170 on the same side of the second channel 130. In this way, the foaming raw material entering the air inlet channel 140 from the feed channel 150 will be discharged through the discharge channel 170. This process corresponds to a material return process after quantitative feeding in the material making process, which is used to recover the excess raw materials in the material making process and save the foaming raw materials.

[0039] When the foaming raw materials need to be mixed and injected into the nozzle 200, the control rod 160 moves from Figure 5 Move the position to Figure 6 The end of the control rod 160 is moved to the position shown in the figure, so that the end of the control rod 160 moves between the air inlet channel 140 and the discharge channel 170. At this time, the air inlet channel 140 and the discharge channel 170 located on the same side of the second channel 130 are isolated, and the two air inlet channels 140 are connected to the first channel 120. High-pressure gas is injected into the air inlet channel 140 through the gas source, so that the foaming raw materials are fully mixed in the mixing chamber 110, and after mixing, they are injected into the foaming mold through the nozzle 200.

[0040] In this solution, connecting grooves 161 are provided on both sides of the control rod 160 along the axial direction. The width of the connecting grooves 161 along the axial direction of the control rod 160 is greater than the distance between the intersection of the discharge channel 170 and the air intake channel 140 and the second channel 130, so as to connect the air intake channel 140 and the discharge channel 170 on the same side of the second channel 130 when the control rod 160 is in the return position.

[0041] In this solution, the isolation between the discharge channels 170 on both sides of the second channel 130 and the air inlet channels 140 on both sides of the second channel 130 can be achieved by adjusting the gap between the control rod 160 and the second channel 130. For example, when the gap between the control rod 160 and the second channel 130 is maintained in the range of 0.03 to 0.08 mm, the control rod 160 can be guaranteed to move freely in the second channel 130, and the foaming raw material can be effectively prevented from flowing freely between the two feed channels 150 and the two air inlet channels 140. When the control rod 160 is in the return position, the connecting groove 161, whose width along the axis direction of the control rod 160 is greater than the distance between the intersection of the discharge channel 170 and the air inlet channel 140 with the second channel 130, can make the discharge channel 170 and the air inlet channel 140 on the same side of the second channel 130 communicate, so that the excess foaming raw material can flow back.

[0042] In this solution, the end of the control rod 160 is arc-shaped, so that when the control rod 160 is in the material return position, the end of the control rod 160 moves out of the moving path of the piston rod 310.

[0043] When the push cylinder 300 drives the piston rod 310 to clear the residual material in the nozzle 200, the arc design of the end of the control rod 160 can ensure that there is no interference between the control rod 160 and the piston rod 310 when the control rod 160 is in the return position, thereby ensuring the normal operation of the piston rod 310.

[0044] A driving member 500 is provided on the mixing block 100, and the control rod 160 is connected to the output end of the driving member 500 to drive the control rod 160 to move in the second channel 130. Preferably, the driving member 500 can be a power component such as a cylinder or a motor.

[0045] The mixing block 100 and the connecting sleeve 600 , as well as the driving member 500 and the mixing block 100 are all detachably connected.

[0046] The detachable connection between the mixing block 100 and the connecting sleeve 600, and between the driving member 500 and the mixing block 100 can be realized by threaded connection. This is mainly to facilitate the disassembly and assembly of the foaming machine head after the foaming process of a batch of foaming parts is completed, so as to facilitate the cleaning of the residual materials in the foaming machine head.

[0047] It should be noted that in the present invention, descriptions such as "first", "second", "one", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. The terms "connected", "fixed", etc. should be understood in a broad sense. For example, "fixed" can be a fixed connection, a detachable connection, or an integral whole; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0048] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0049] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A foaming machine head, characterized in that: include: A mixing block, wherein a mixing chamber is provided therein, and the mixing chamber is used for mixing foaming raw materials; A nozzle, which is arranged on the mixing block, and the interior of the nozzle is communicated with the mixing chamber; A push cylinder is arranged on the mixing block, and a piston rod of the push cylinder is movably inserted in the nozzle to remove the residual material on the inner wall of the nozzle, and the connection part between the mixing chamber and the nozzle is located on the moving path of the piston rod to control the opening size of the connection part; An adjusting member is connected to the pushing cylinder, one end of which extends into the pushing cylinder and movably abuts against the piston rod, so as to adjust the retracted position of the piston rod after it is retracted into the pushing cylinder.

2. A foaming machine head as claimed in claim 1, characterized in that: The push cylinder includes a cylinder body and an end cover connected to the cylinder body, and the adjusting member is threadedly connected to the end cover so that when the adjusting member rotates, the adjusting member extends into one end of the push cylinder and moves toward the piston rod.

3. A foaming machine head as claimed in claim 2, characterized in that: The adjusting member includes a limiting member, a plurality of first limiting grooves are arranged on the outer wall of the end cover at intervals along the circumference thereof, a plurality of second limiting grooves are arranged on the outer wall of the adjusting member at intervals along the circumference thereof, at least one of the first limiting grooves is connected to the second limiting groove, and the limiting member is inserted into the connected first limiting groove and the second limiting groove.

4. A foaming machine head as claimed in claim 3, characterized in that: The adjusting member is provided with a threaded hole, and the limiting member is provided with a bolt through hole. The bolt passes through the bolt through hole and is connected in the threaded hole, so that the limiting member is connected to the adjusting member.

5. A foaming machine head as claimed in claim 1, characterized in that: A connecting sleeve is provided between the pushing cylinder and the mixing block, a cavity is provided in the connecting sleeve, the piston rod is movably inserted in the cavity, a window communicating with the cavity is provided on the side wall of the connecting sleeve, and the window is used to expose the piston rod to the outside.

6. A foaming machine head as claimed in claim 5, characterized in that: The mixing block has a length direction, a width direction and a height direction, and comprises: a first channel, which penetrates the mixing block along the height direction, and one end of the piston rod is movably inserted in the first channel; A second channel, which penetrates the mixing block along the width direction and is connected to the first channel, and the intersection of the first channel and the second channel forms the mixing chamber; Inlet channels are disposed on both sides of the second channel and communicated with the second channel, one end of each of the two inlet channels passes through one end of the mixing block along the length direction, and are used to introduce gas into the second channel; two feed channels disposed on both sides of the second channel and connected to the air inlet channel on the same side of the second channel; two discharge channels disposed on both sides of the second channel and connected to the second channel; A control rod, which is movably inserted in the second channel and has a material injection position and a material return position; When the control rod is in the injection position, the end of the control rod is located between the air inlet channel and the discharge channel, so that the air inlet channel and the discharge channel are isolated and the two air inlet channels are connected to each other; When the control rod is in the return position, the end of the control rod is located between the air inlet channel and the first channel, so that the two air inlet channels are isolated and the air inlet channel and the discharge channel on the same side of the second channel are connected.

7. A foaming machine head as claimed in claim 6, characterized in that: The control rod is provided with connecting grooves on both sides along the axial direction, and the width of the connecting groove along the axial direction of the control rod is greater than the distance between the intersection of the discharge channel and the air inlet channel and the second channel, so as to connect the air inlet channel and the discharge channel on the same side of the second channel when the control rod is in the return position.

8. A foaming machine head as claimed in claim 6, characterized in that: The end of the control rod is in an arc shape, so that when the control rod is in the material return position, the end of the control rod moves out of the moving path of the piston rod.

9. A foaming machine head as claimed in claim 6, characterized in that: The mixing block is provided with a driving member, and the control rod is connected to the output end of the driving member to drive the control rod to move in the second channel.

10. A foaming machine head as claimed in claim 9, characterized in that: The mixing block and the connecting sleeve, as well as the driving member and the mixing block are all detachably connected.

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