Foaming machine head
By improving the structure of the foaming machine head, including the design of the mixing block, spray pipe, and pusher cylinder, the problems of uneven foaming and difficult cleaning were solved, achieving uniform mixing of raw materials and efficient cleaning of the equipment, thus improving product quality and production efficiency.
Patent Information
- Application Number
- CN202520224210.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-13
- Publication Date
- 2026-01-27
- Estimated Expiration
- 2035-02-13
AI Technical Summary
Traditional foaming machine heads use a simple mixing method, which results in insufficient fusion of liquid and gaseous raw materials, uneven foaming, and large fluctuations in product quality. Furthermore, cleaning is difficult, and residual raw materials tend to adhere, affecting subsequent foaming quality and increasing equipment maintenance costs.
A foaming machine head including a mixing block, a nozzle, a pusher cylinder, and an adjusting component was designed. The mixing pressure is controlled by adjusting the retraction position of the piston rod to ensure that the raw materials are fully mixed. The design of the pusher cylinder and the connecting sleeve facilitates the cleaning of residues, achieving efficient cleaning.
This process achieves uniform mixing of foaming raw materials, improves product quality consistency, reduces cleaning difficulty and equipment maintenance costs, and ensures the stability and efficiency of the foaming process.
Smart Images
Figure CN223834915U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of foaming machine technology, and specifically relates to a foaming machine head. Background Technology
[0002] The die head of a foaming machine is one of the key components of foaming equipment. It is mainly used to mix chemical raw materials (such as polyurethane and phenolic resin) at a certain ratio and speed, and then spray or extrude them as foam through a specific outlet. This process usually involves a chemical reaction, causing the raw materials to expand and form a foam structure as they pass through the die 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 automotive seat manufacturing. Their performance directly affects product quality and production efficiency. As the core component of the foaming machine, the performance of the die head plays a decisive role.
[0003] However, traditional foaming heads have significant drawbacks. Their relatively simple mixing method fails to achieve thorough blending of liquid and gaseous raw materials, resulting in uneven foaming and significant fluctuations in product quality. In high-end applications with stringent foaming quality requirements, such as the production of high-end building insulation materials, this problem severely restricts the improvement of product performance and the enhancement of market competitiveness.
[0004] Furthermore, after the foaming process is completed, residual materials easily adhere to the walls of the foaming chamber inside the machine head. Because the machine head is a single-piece structure with a small and complex internal space, conventional cleaning tools struggle to reach every corner, making cleaning extremely difficult. This not only causes the residual materials to gradually solidify, severely affecting the quality and stability of subsequent foaming operations, but may also lead to pipe blockages, significantly increasing equipment maintenance costs and downtime, thereby reducing production efficiency. Utility Model Content
[0005] The technical problem to be solved by this utility model is to provide a foaming machine head in light of the current state of the technology.
[0006] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: a foaming machine head is provided, including: a mixing block, which has a mixing chamber inside, the mixing chamber being used for mixing foaming raw materials;
[0007] A nozzle is disposed on the mixing block, and the interior of the nozzle communicates with the mixing chamber.
[0008] A pusher cylinder is mounted on the mixing block. The piston rod of the pusher cylinder is movably inserted into the nozzle to remove residual material from the inner wall of the nozzle. The connection between the mixing chamber and the nozzle is located on the movement path of the piston rod to control the opening of the connection.
[0009] An adjusting component is connected to the pusher cylinder. One end of the adjusting component extends into the pusher cylinder and moves against the piston rod, and is used to adjust the retraction position of the piston rod after it is retracted into the pusher cylinder.
[0010] In one of the foaming machine heads described above, the pushing cylinder includes a cylinder body and an end cap connected to the cylinder body. The adjusting member is threadedly connected to the end cap and is used to move one end of the adjusting member into the pushing cylinder toward the piston rod when the adjusting member rotates.
[0011] In the aforementioned foaming machine head, the adjusting component includes a limiting component. A plurality of first limiting grooves are spaced apart along the circumference of the outer side wall of the end cap, and a plurality of second limiting grooves are spaced apart along the circumference of the outer side wall of the adjusting component. At least one of the first limiting grooves and the second limiting grooves are connected, and the limiting component is inserted into the connected first limiting groove and the second limiting groove.
[0012] In the aforementioned foaming machine head, the adjusting component is provided with a threaded hole, and the limiting component 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 component can be connected to the adjusting component.
[0013] In one type of foaming machine head described above, a connecting sleeve is provided between the pushing cylinder and the mixing block. A cavity is provided inside the connecting sleeve, and the piston rod is movably inserted into 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.
[0014] In one type of foaming machine head described above, the mixing block has a length direction, a width direction, and a height direction, and includes:
[0015] A first channel extends through the mixing block along the height direction, and one end of the piston rod is movably inserted into the first channel;
[0016] The second channel extends through the mixing block along the width direction and communicates with the first channel, and the intersection of the first channel and the second channel forms the mixing cavity;
[0017] The air intake channels are respectively located on both sides of the second channel and connected to the second channel. One end of each of the two air intake channels passes through one end of the mixing block along the length direction, and is used to introduce gas into the second channel.
[0018] Two feed channels are located on both sides of the second channel and are connected to the air intake channel on the same side as the second channel;
[0019] Two discharge channels are located on both sides of the second channel and are connected to the second channel;
[0020] A control lever, which is movably inserted into the second channel and has a feeding position and a return position;
[0021] When the control lever is in the injection position, the end of the control lever is located between the air inlet channel and the discharge channel, which isolates the air inlet channel and the discharge channel and connects the two air inlet channels to each other;
[0022] When the control lever is in the return position, the end of the control lever is located between the air inlet channel and the first channel, isolating the two air inlet channels and connecting the air inlet channel and the discharge channel on the same side of the second channel.
[0023] In the aforementioned foaming machine head, the control rod is provided with connecting grooves on both sides along the axial direction. The width of the connecting groove along the axial direction of the control rod is greater than the distance between the material discharge channel and the air inlet channel and the second channel. This is to connect the air inlet channel and the material discharge channel on the same side of the second channel when the control rod is in the material return position.
[0024] In one of the foaming machine heads described above, the end of the control rod is arc-shaped, which is used to move the end of the control rod out of the movement path of the piston rod when the control rod is in the return material position.
[0025] In one of the foaming machine heads described above, a driving component is provided on the mixing block, and a control rod is connected to the output end of the driving component to drive the control rod to move within the second channel.
[0026] In the aforementioned foaming machine head, the mixing block and the connecting sleeve, as well as the drive component and the mixing block, are detachably connected.
[0027] Compared with the prior art, the present invention has the following beneficial effects:
[0028] (1) By adjusting the piston rod of the pusher cylinder after retraction, the opening of the connection is controlled, thereby adjusting the pressure during the mixing of the foaming raw materials. This ensures that the foaming raw materials are fully mixed, thus guaranteeing the quality of the foamed parts.
[0029] (2) The limiting component is used to fix the adjusting component and the end cover of the pusher cylinder together after the piston rod is retracted, so as to ensure that the foaming machine head runs normally in the foaming process.
[0030] (3) The design of the connecting sleeve and its upper window facilitates the cleaning of residual material adhering to the piston rod, thereby ensuring the normal foaming process of the foamed parts. Attached Figure Description
[0031] Figure 1 This is a perspective view of a foaming machine head according to the present invention;
[0032] Figure 2 This is a cross-sectional view of the head of a foaming machine according to this utility model;
[0033] Figure 3 It is a 3D view of the control lever;
[0034] Figure 4 This is a cross-sectional view of the composite block;
[0035] Figure 5 This is a schematic diagram of the structure when the control lever is in the return position;
[0036] Figure 6 This is a schematic diagram of the structure when the control lever is in the injection position;
[0037] Figure 7 It is a three-dimensional view of the end cap;
[0038] Figure 8 This is a three-dimensional view of the adjustment component structure.
[0039] In the diagram, L represents the length direction; W represents the width direction; H represents 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 intake channel; 150 is the feeding channel; 160 is the control rod; 161 is the connecting groove; 170 is the discharge channel; 200 is the nozzle; 300 is the pushing cylinder; 310 is the piston rod; 320 is the cylinder body; 330 is the end cap; 331 is the first limiting groove; 400 is the adjusting component; 410 is the limiting component; 411 is the bolt through hole; 420 is the second limiting groove; 430 is the threaded hole; 500 is the driving component; 600 is the connecting sleeve; and 610 is the window. Detailed Implementation
[0040] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.
[0041] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.
[0042] like Figures 1 to 8 As shown, the foaming machine head of this utility model includes: a mixing block 100, a spray pipe 200, a pushing cylinder 300, and an adjusting component 400.
[0043] Specifically, the mixing block 100 is provided with a mixing chamber 110 for mixing foaming raw materials; the nozzle 200 is placed on the mixing block 100 and communicates with the mixing chamber 110; the pusher cylinder 300 is set on the mixing block 100, and the piston rod 310 of the pusher cylinder 300 is movably inserted into the nozzle 200 to remove residual material on the inner wall of the nozzle 200, and the connection between the mixing chamber 110 and the nozzle 200 is located on the moving path of the piston rod 310 to control the opening of the connection; the adjusting member 400 is connected to the pusher cylinder 300, and one end of the adjusting member 400 extends into the pusher cylinder 300 and moves against the piston rod 310 to adjust the retraction position of the piston rod 310 after it retracts into the pusher cylinder 300.
[0044] Before the foaming operation begins, the length of one end of the adjusting component 400 extending into the pusher cylinder 300 must be adjusted to control the retraction distance of the piston rod 310, thereby changing the position of the piston rod 310 after retracting into the pusher cylinder 300 and inserting into one end of the mixing block 100. After adjustment, when the piston rod 310 is fully retracted into the pusher cylinder 300, it must be ensured that the overlap between the end of the piston rod 310 and the connecting part is appropriate, thus achieving the purpose of adjusting the opening size of the connecting part. During operation, the foaming raw materials (such as polyurethane and phenolic resin) are fully mixed in the mixing chamber 110 and then introduced into the nozzle 200, and then enter the foaming mold through the nozzle 200. If the opening of the connecting part is reduced to about two-thirds of its original size, the pressure of the mixture entering the nozzle 200 from the mixing chamber 110 will increase, thereby making the foaming raw materials more uniformly mixed, improving the consistency of the foaming effect, and reducing product quality fluctuations.
[0045] The proportions of foaming raw materials will vary depending on the performance requirements (such as hardness requirements) of the foamed parts. Different proportions of foaming raw materials require different pressures to achieve thorough mixing. This solution adapts to these changes by adjusting the position of the piston rod 310, enabling the foaming machine head to respond more quickly to the needs of different foamed parts.
[0046] After one foaming operation is completed, the mixing chamber 110 and the nozzle 200 are separated. At this time, the pusher cylinder 300 drives the piston rod 310 forward to push out the remaining mixture in the nozzle 200, so as to keep the nozzle 200 clean, prevent blockage, and ensure the quality stability of the next foaming operation.
[0047] Reference Figure 1 , Figure 2 , Figure 7 and Figure 8The pusher cylinder 300 includes a cylinder body 320 and an end cap 330 connected to the cylinder body 320. An adjusting member 400 is threadedly connected to the end cap 330 and is used to move one end of the adjusting member 400 into the pusher cylinder 300 towards the piston rod 310 when the adjusting member 400 is rotated.
[0048] The threaded connection between the adjusting member 400 and the end cap 330 can be achieved by providing a threaded hole 430 on the end cap 330 and providing an external thread on the outside of the adjusting member 400 that matches the threaded hole 430, as shown in the figure. Figure 2 (At this time, the end of the adjusting member 400 extends to the deepest point of the pusher cylinder 300). When the adjusting member 400 is rotated, the threaded connection between the adjusting member 400 and the end cover 330 will cause the adjusting member 400 to... Figure 2 The opening of the connecting part gradually increases as it moves upward.
[0049] The structure of the cylinder body 320 and piston rod 310 of the regulating cylinder, as well as the oil circuit design, are no different from those of an ordinary oil cylinder in terms of how they drive the piston rod 310 to move relative to the cylinder body 320, and will not be elaborated here.
[0050] During the foaming process, the foaming material is injected into the mixing chamber 110 under high pressure generated by the foaming machine. After one main material process is completed, when the high pressure stops, the foaming machine head will vibrate. This vibration may cause the adjusting component 400 to rotate relative to the pushing cylinder 300, thereby changing the retraction position of the piston rod 310 in the pushing cylinder 300. This change will affect the mixing pressure of the foaming material, resulting in unstable quality of the foamed parts.
[0051] To solve the above problems, in this solution, the adjusting member 400 includes a limiting member 410. The outer side wall of the end cover 330 is provided with a plurality of first limiting grooves 331 spaced apart along its circumference. The outer side wall of the adjusting member 400 is provided with a plurality of second limiting grooves 420 spaced apart along its circumference. At least one first limiting groove 331 and the second limiting groove 420 are connected. The limiting member 410 is inserted into the connected first limiting groove 331 and the second limiting groove 420.
[0052] When adjusting the retracted position of the piston rod 310 by rotating the adjusting member 400, the limiting member 410 must first be removed from the adjusting member 400. At this time, without the constraint of the limiting member 410, the adjusting member 400 can rotate freely relative to the cylinder body 320 under 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 second limiting groove 420, thereby fixing the adjusting member 400 to the cylinder body 320.
[0053] Furthermore, in order to prevent the vibration of the foaming machine from causing the limiting member 410 to disengage from the adjusting member 400, in this solution, the adjusting member 400 is provided with a threaded hole 430, and the limiting member 410 is provided with a bolt through hole 411. The bolt passes through the bolt through hole 411 and is connected in the threaded hole 430, so that the limiting member 410 can be connected to the adjusting member 400.
[0054] Reference Figure 1 and Figure 2 A connecting sleeve 600 is provided between the pusher cylinder 300 and the mixing block 100. A cavity is provided inside the connecting sleeve 600. The piston rod 310 is movably inserted into 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.
[0055] When the pusher cylinder 300 drives the piston rod 310 to insert into the nozzle 200, pushing the material attached to the inner wall of the nozzle 200 away from the nozzle 200, some material will stick to the piston rod 310. The window 610 on the connecting sleeve 600 is designed to help the operator use tools such as an air gun to remove the material stuck to the piston rod 310, thereby ensuring the normal operation of the foaming operation.
[0056] In this design, the mixing block 100 has a length direction L, a width direction W, and a height direction H, and includes: a first channel 120 that penetrates the mixing block 100 along the height direction H, with one end of the piston rod 310 movably inserted into the first channel 120; a second channel 130 that penetrates the mixing block 100 along the width direction W and communicates with the first channel 120, the intersection of the first channel 120 and the second channel 130 forming a mixing chamber 110; air intake channels 140 located on both sides of the second channel 130 and communicating with the second channel 130, with one end of each air intake channel 140 penetrating one end of the mixing block 100 along the length direction L, used to introduce gas into the second channel 130; and air intakes located on both sides of the second channel 130 and on the same side as the second channel 130. The passage 140 connects two feed channels 150; two discharge channels 170 are respectively located on both sides of the second channel 130 and connected to the second channel 130; a control rod 160 is movably inserted into the second channel 130 and has a feeding position and a return position; when the control rod 160 is in the feeding position, the end of the control rod 160 is located between the air intake channel 140 and the discharge channel 170, isolating the air intake channel 140 and the discharge channel 170, and connecting the two air intake channels 140 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 intake channel 140 and the first channel 120, isolating the two air intake channels 140, and connecting the air intake channel 140 and the discharge channel 170 on the same side of the second channel 130.
[0057] One end of the air intake channel 140 is connected to an air source, providing power for injecting the foaming raw material into the mixing chamber 110 and guiding it into the nozzle 200. (Refer to...) Figure 4 and Figure 5 At this time, the end of the control lever 160 is located between the air inlet channel 140 and the first channel 120, isolating the air inlet channel 140 from the first channel 120 and connecting the air inlet channel 140 with the discharge channel 170, which is located on the same side of the second channel 130. Thus, the foaming 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 during the feeding process, used to recover excess material from the feeding process and save foaming material.
[0058] When it is necessary to mix the foaming material and inject it into the nozzle 200, the control lever 160 moves from... Figure 5 Moved to Figure 6 The control lever 160 is positioned such that its end 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 as the second channel 130, are isolated, and both air inlet channels 140 are connected to the first channel 120. High-pressure gas is injected into the air inlet channel 140 through an air source, causing the foaming material to be fully mixed in the mixing chamber 110, and then injected into the foaming mold through the nozzle 200 after mixing.
[0059] In this design, the control lever 160 is provided with connecting grooves 161 on both sides along the axial direction. The width of the connecting grooves 161 along the axial direction of the control lever 160 is greater than the distance between the material discharge channel 170 and the air inlet channel 140 and the second channel 130. This is to connect the air inlet channel 140 and the material discharge channel 170 on the same side of the second channel 130 when the control lever 160 is in the return position.
[0060] In this design, the isolation between the discharge channels 170 on both sides of the second channel 130 and between 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 within the range of 0.03 to 0.08 mm, it ensures that the control rod 160 can move freely within the second channel 130 while effectively preventing the foaming material 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 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, allows the discharge channel 170 and the air inlet channel 140 on the same side of the second channel 130 to connect, thereby allowing excess foaming material to flow back.
[0061] In this design, the end of the control lever 160 is arc-shaped, which is used to move the end of the control lever 160 out of the movement path of the piston rod 310 when the control lever 160 is in the return position.
[0062] When the pusher cylinder 300 drives the piston rod 310 to remove residual material in the nozzle 200, the arc-shaped design at the end of the control rod 160 ensures 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.
[0063] A drive unit 500 is provided on the mixing block 100, and a control lever 160 is connected to the output end of the drive unit 500 to drive the control lever 160 to move within the second channel 130. Preferably, the drive unit 500 can be a power component such as a hydraulic cylinder or a motor.
[0064] The connection between the mixing block 100 and the connecting sleeve 600, as well as the connection between the driving component 500 and the mixing block 100, are detachable.
[0065] The detachable connections between the mixing block 100 and the connecting sleeve 600, and between the drive component 500 and the mixing block 100, can be achieved through threaded connections. This is mainly to facilitate the disassembly and assembly of the foaming machine head after the foaming process of a batch of foamed parts is completed, thereby making it easier to clean the residual material inside the foaming machine head.
[0066] It should be noted that in this utility model, the use of terms such as "first," "second," and "a" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of those features. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly defined. The terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two elements or the interaction between two elements, unless otherwise explicitly defined. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0067] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.
[0068] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.
Claims
1. A foaming machine head, characterized in that, include: A mixing block having a mixing chamber therein for mixing foaming raw materials; A nozzle is disposed on the mixing block, and the interior of the nozzle communicates with the mixing chamber. A pusher cylinder is mounted on the mixing block. The piston rod of the pusher cylinder is movably inserted into the nozzle to remove residual material from the inner wall of the nozzle. The connection between the mixing chamber and the nozzle is located on the movement path of the piston rod to control the opening of the connection. An adjusting component is connected to the pusher cylinder. One end of the adjusting component extends into the pusher cylinder and moves against the piston rod, and is used to adjust the retraction position of the piston rod after it is retracted into the pusher cylinder.
2. The foaming machine head as described in claim 1, characterized in that, The pusher cylinder includes a cylinder body and an end cap connected to the cylinder body. The adjusting member is threadedly connected to the end cap and is used to move one end of the adjusting member into the pusher cylinder toward the piston rod when the adjusting member is rotated.
3. The foaming machine head as described in claim 2, characterized in that, The adjusting member includes a limiting member. A plurality of first limiting grooves are provided at intervals along the circumference on the outer side wall of the end cap. A plurality of second limiting grooves are provided at intervals along the circumference on the outer side wall of the adjusting member. At least one of the first limiting grooves and the second limiting grooves are connected. The limiting member is inserted into the connected first limiting groove and the second limiting groove.
4. The foaming machine head as described in claim 3, characterized in that, The adjusting component is provided with a threaded hole, and the limiting component 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 component can be connected to the adjusting component.
5. The foaming machine head as described in claim 1, characterized in that, A connecting sleeve is provided between the pushing cylinder and the mixing block. A cavity is provided inside the connecting sleeve. The piston rod is movably inserted into the cavity. A window communicating with the cavity is provided on the side wall of the connecting sleeve. The window is used to expose the piston rod.
6. The foaming machine head as described in claim 5, characterized in that, The hybrid block has a length direction, a width direction, and a height direction, and includes: A first channel extends through the mixing block along the height direction, and one end of the piston rod is movably inserted into the first channel; The second channel extends through the mixing block along the width direction and communicates with the first channel, and the intersection of the first channel and the second channel forms the mixing cavity; The air intake channels are respectively located on both sides of the second channel and connected to the second channel. One end of each of the two air intake channels passes through one end of the mixing block along the length direction, and is used to introduce gas into the second channel. Two feed channels are located on both sides of the second channel and are connected to the air intake channel on the same side as the second channel; Two discharge channels are located on both sides of the second channel and are connected to the second channel; A control lever, which is movably inserted into the second channel and has a feeding position and a return position; When the control lever is in the injection position, the end of the control lever is located between the air inlet channel and the discharge channel, which isolates the air inlet channel and the discharge channel and connects the two air inlet channels to each other; When the control lever is in the return position, the end of the control lever is located between the air inlet channel and the first channel, isolating the two air inlet channels and connecting the air inlet channel and the discharge channel on the same side of the second channel.
7. A foaming machine head as described in claim 6, characterized in that, Both sides of the control rod along the axial direction are provided with connecting grooves. The width of the connecting groove along the axial direction of the control rod is greater than the distance between the material discharge channel and the air inlet channel and the second channel. This is to connect the air inlet channel and the material discharge channel on the same side of the second channel when the control rod is in the material return position.
8. A foaming machine head as described in claim 6, characterized in that, The end of the control rod is arc-shaped, which is used to move the end of the control rod out of the movement path of the piston rod when the control rod is in the return position.
9. A foaming machine head as described in claim 6, characterized in that, The mixing block is provided with a driving component, and the control lever is connected to the output end of the driving component to drive the control lever to move within the second channel.
10. A foaming machine head as described in claim 9, characterized in that, The connection between the mixing block and the connecting sleeve, as well as the connection between the driving component and the mixing block, are detachable.