Polyurethane mixing gun head

Abstract

The utility model discloses a polyurethane mixing gun head which comprises a main body with a cavity, an air cylinder fixed on the right side of the main body and connecting pieces fixed on the front side and the rear side of the main body and provided with injection nozzles, a cylinder column of the air cylinder stretches into the cavity, the front end of the cylinder column can stretch out of the left side of the main body, feeding holes are formed in the two sides of the cylinder column, and a discharging hole is formed in the front end of the cylinder column. A first channel for communicating the feeding hole with the discharging hole is arranged between the feeding hole and the discharging hole, the connecting piece is provided with a concave part, a discharging nozzle with a second channel and a positioning sleeve, the positioning sleeve is fixed at an opening of the concave part, and one end of the discharging nozzle extends out of a through hole of the positioning sleeve to be in contact with a cylinder column of the air cylinder; a movable column elastically pressed by a plurality of overlapped belleville spring groups and a guide groove are arranged in the concave part, one end of the movable column is in contact with the other end of the discharging nozzle, the other end of the movable column extends into the guide groove, the movable column is provided with a third channel, and the injection nozzle is communicated with the guide groove. Compared with the prior art, the device has the advantages of being convenient to use and effectively ensuring the production efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of foaming equipment, in particular to a polyurethane mixing gun head. Background Art

[0002] The existing polyurethane mixing gun head includes a main body with a cavity, a cylinder, two connecting parts and two injection nozzles. The cylinder is fixed on the right side of the main body, and the two connecting parts are respectively fixed on the front and rear sides of the main body. The cylinder column of the cylinder extends into the cavity and its front end can extend from the left side of the main body. Feed holes are provided on both sides of the cylinder column, and a discharge hole is provided at the front end. A channel connecting the feed hole and the discharge hole is provided. The connecting part is provided with a recess, a coil spring, a discharge nozzle and a positioning sleeve. The positioning sleeve is fixed at the opening of the recess. The two injection nozzles are respectively fixed on the connecting part and are connected to the recess. One end of the discharge nozzle extends from the through hole of the positioning sleeve and contacts with the cylinder column of the cylinder and is confined in the recess by the positioning sleeve so as not to fall out of the recess. One end of the coil spring is pressed on the discharge nozzle, and the other end is pressed on the bottom of the recess. When injecting materials, the cylinder works, and the cylinder column moves to the left side of the main body and extends from the left side of the main body. The discharge nozzle is just opposite to the feed hole. The polyurethane in the injection nozzle enters the recess of the connector and then enters the feed hole from the discharge nozzle, and then enters the discharge hole through the channel and is ejected from the discharge hole. The coil spring is only suitable for pressure with a smaller load. When the pressure is large, the elastic force is insufficient. The insufficient elastic force of the coil spring cannot make the discharge nozzle close to the cylinder column, and the polyurethane will leak from between the discharge nozzle and the cylinder column and fill the cavity of the main body. After the injection is completed, the polyurethane in the mixing gun head cannot be blown out, which causes the gun head to be blocked. The gun must be disassembled and cleaned to restore it. It is inconvenient to use and affects production efficiency. Utility Model Content

[0003] The purpose of the utility model is to provide a polyurethane mixing gun head, which is used to solve the above technical problems.

[0004] The utility model discloses a polyurethane mixing gun head, comprising a main body with a cavity, a cylinder and two connecting parts with injection nozzles, the cylinder is fixed on the right side of the main body, the two connecting parts are respectively fixed on the front and rear sides of the main body, the cylinder column of the cylinder extends into the cavity and its front end can extend from the left side of the main body, feed holes are provided on both sides of the cylinder column, and a discharge hole is provided at the front end, a first channel connecting the feed hole and the discharge hole is provided between the feed hole and the discharge hole, the connecting part is provided with a recess, a discharge nozzle with a second channel and a positioning sleeve, the positioning sleeve is fixed at the opening of the recess, one end of the discharge nozzle extends from the through hole of the positioning sleeve and contacts with the cylinder column of the cylinder, a movable column and a guide groove which are pressed by a plurality of disc spring groups superimposed on each other are provided in the recess, one end of the movable column contacts with the other end of the discharge nozzle, the other end of the movable column extends into the guide groove, the movable column is provided with a third channel connected with the second channel of the discharge nozzle and the guide groove, and the injection nozzle is connected to the guide groove.

[0005] Preferably, the disc spring assembly comprises a first disc spring piece and a second disc spring piece coaxially stacked and aligned with each other, and the outer edge of the first disc spring piece abuts against the outer edge of the second disc spring piece.

[0006] Preferably, the disc spring assembly is sleeved on the movable column.

[0007] Preferably, the movable column includes a column head and a column body, and the diameter of the column head is larger than the diameter of the column body.

[0008] Preferably, the first disc spring piece and the second disc spring piece of the disc spring assembly are both provided with openings, and the column body of the movable column is inserted into the openings so that the disc spring assembly is sleeved on the column body.

[0009] Preferably, the transverse cross-section of the movable column is T-shaped.

[0010] Preferably, the guide groove is provided at the bottom of the recess, and the guide groove has the same shape as the longitudinal cross-section of the movable column.

[0011] Preferably, the longitudinal cross-sections of the guide groove and the movable column are both circular.

[0012] Preferably, a heat insulating pad is provided between the main body and the cylinder.

[0013] Preferably, a sealing ring which is sleeved on the cylinder column is provided in the thermal insulation pad.

[0014] Compared with the prior art, the utility model has a movable column and a guide groove which are compressed by a plurality of disc spring groups superimposed on each other in a recess. One end of the movable column is in contact with the other end of the discharge nozzle, and the other end of the movable column extends into the guide groove. The plurality of disc spring groups superimposed on each other can withstand a large load with a small deformation, and have a greater shock absorption capacity than the coil spring. The pressure of the plurality of disc spring groups is concentrated on the discharge nozzle through the movable column, so that one end of the discharge nozzle is in close contact with the cylinder column of the cylinder, effectively preventing polyurethane from leaking from between the discharge nozzle and the cylinder column, and has the advantages of being easy to use and effectively ensuring production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a three-dimensional diagram of a polyurethane mixing gun head of the utility model;

[0016] Figure 2 for Figure 1 A three-dimensional image with one connector removed;

[0017] Figure 3 for Figure 1 A partially cutaway perspective view of

[0018] Figure 4 for Figure 1 a cross-sectional view of another position of

[0019] The realization of the functions and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0020] The following diagrams illustrate various embodiments of the present invention. For clarity, many practical details will be included in the following description. However, it should be understood that these practical details are not intended to limit the present invention. In other words, in some embodiments of the present invention, these practical details are not essential. Furthermore, to simplify the drawings, some commonly used structures and components are depicted in simplified schematic form.

[0021] 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 various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0022] In addition, in the present invention, descriptions such as "first" and "second" are only used for descriptive purposes and do not specifically refer to the order or sequence, nor are they used to limit the present invention. They are only used to distinguish components or operations described with the same technical terms, 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 such feature. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0023] In order to further understand the content, features and effects of the present invention, the following embodiments are given as examples and described in detail with reference to the accompanying drawings:

[0024] like Figures 1 to 4As shown, a polyurethane mixing gun head of the present invention includes a main body 1 with a cavity 11, a cylinder 2, two connecting parts 3 and two injection nozzles 4. The cylinder 2 is fixed to the right side of the main body 1, and the two connecting parts 3 are respectively fixed to the front and rear sides of the main body 1. The cylinder column 21 extends into the cavity 11 and its front end can extend from the left side of the main body 1. The cylinder column 21 is provided with feed holes 22 on both sides and a discharge hole 23 at the front end. A first channel 24 is provided between the feed hole 22 and the discharge hole 23 to connect the two. The connecting part 3 is provided with a recess 31, a discharge nozzle 32 with a second channel 33 and a positioning Sleeve 34, the positioning sleeve 34 is fixed at the opening of the recess 31, and the two injection nozzles 4 are respectively fixed on the connecting piece 3, and one end of the discharge nozzle 32 extends from the through hole of the positioning sleeve 34 and contacts with the cylinder column 21 of the cylinder 2. A movable column 35 and a guide groove 36 are provided in the recess 31, which are pressed by multiple disc spring groups superimposed on each other. One end of the movable column 35 contacts with the other end of the discharge nozzle 32, and the other end of the movable column 35 extends into the guide groove 36. The movable column 35 is provided with a third channel 37 connected to the second channel 33 of the discharge nozzle 32 and the guide groove 36, and the injection nozzle 4 is connected to the guide groove 36. Compared with the prior art, the present invention is provided with a movable column 35 and a guide groove 36 which are compressed by a plurality of disc spring groups superimposed on each other in a recess 31. One end of the movable column 35 is in contact with the other end of the discharge nozzle 32, and the other end of the movable column 35 extends into the guide groove 36. The multiple disc spring groups superimposed on each other can withstand a large load with a small deformation, and have a greater shock absorption capacity than a coil spring. The pressure of the multiple disc spring groups is concentrated on the discharge nozzle 32 through the movable column 35, so that one end of the discharge nozzle 32 is in close contact with the cylinder column 21 of the cylinder 2, effectively preventing polyurethane from coming out from between the discharge nozzle 32 and the cylinder column 21, and has the advantages of being easy to use and effectively ensuring production efficiency.

[0025] More specifically, if Figure 4 As shown, the disc spring assembly comprises a first disc spring piece 38 and a second disc spring piece 39, coaxially stacked and aligned. The outer edge of the first disc spring piece 38 abuts against the outer edge of the second disc spring piece 39. This alignment enhances the bearing capacity and elasticity of the disc spring assembly. The movable post 35 comprises a head and a body, with the head having a larger diameter than the body. Both the first disc spring piece 38 and the second disc spring piece 39 of the disc spring assembly have openings, the diameter of which is larger than the body but smaller than the head. The body of the movable post 35 is inserted into the opening 30, securing the disc spring assembly to the body. The movable post 35 has a T-shaped transverse cross-section, with a guide groove 36 provided at the bottom of the recess 31. The guide groove 36 has the same longitudinal cross-section as the movable post 35; both the guide groove 36 and the movable post 35 have circular longitudinal cross-sections.

[0026] Optionally, a heat insulating pad 5 is provided between the main body 1 and the cylinder 2. A sealing ring 6 is provided within the heat insulating pad 5 and is sleeved onto the cylinder column 21. The heat insulating pad 5 can prevent heat from the main body 1 from being transferred to the cylinder 2, thereby ensuring the normal operation of the cylinder 2. The sealing ring 6 can prevent the cavity 11 from entering the cylinder 2, further ensuring the normal operation of the cylinder 2.

[0027] The working principle of the polyurethane mixing gun head of the utility model is as follows: two injection nozzles 4 inject two different materials, and the material injected from the injection nozzle 4 first enters the guide groove 36, then enters the third channel 37 of the movable column 35, and then enters the second channel 33 of the discharge nozzle 32 from the third channel 37. When the discharge nozzle 32 faces the feed holes 22 on both sides of the cylinder column 21, the material enters the first channel 24 from the feed hole 22, and finally is ejected from the discharge hole 23 (as shown in FIG. Figure 4 As shown by the arrow, if the discharge nozzle 32 is staggered from the feed holes 22 on both sides of the cylinder column 21, the pressure of the multiple disc spring groups is concentrated on the discharge nozzle 32 through the movable column 35, so that one end of the discharge nozzle 32 is in close contact with the cylinder column 21 of the cylinder 2 to prevent material from leaking from between the discharge nozzle 32 and the cylinder column 21.

[0028] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements or improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A polyurethane mixing gun head, comprising a main body with a cavity, a cylinder, and two connecting members with injection nozzles, the cylinder being fixed to the right side of the main body, the two connecting members being fixed to the front and rear sides of the main body, the cylinder column extending into the cavity and its front end being able to extend from the left side of the main body, the cylinder column being provided with feed holes on both sides, a discharge hole being provided at the front end, a first passage being provided between the feed hole and the discharge hole to connect the two, the connecting member being provided with a recess, a discharge nozzle with a second passage, and a positioning sleeve, the positioning sleeve being fixed at the opening of the recess, one end of the discharge nozzle extending from the through hole of the positioning sleeve to contact the cylinder column of the cylinder, characterized in that: The recess is provided with a movable column and a guide groove which are pressed by a plurality of disc spring groups superimposed on each other. One end of the movable column is in contact with the other end of the discharge nozzle, and the other end of the movable column extends into the guide groove. The movable column is provided with a third channel connected to the second channel of the discharge nozzle and the guide groove, and the injection nozzle is connected to the guide groove.

2. A polyurethane mixing gun head according to claim 1, characterized in that: The disc spring assembly comprises a first disc spring piece and a second disc spring piece coaxially stacked together, and the outer edge of the first disc spring piece abuts against the outer edge of the second disc spring piece.

3. A polyurethane mixing gun head according to claim 1, characterized in that: The disc spring assembly is sleeved on the movable column.

4. A polyurethane mixing gun head according to claim 1, characterized in that: The movable column comprises a column head and a column body, and the diameter of the column head is larger than the diameter of the column body.

5. A polyurethane mixing gun head according to claim 4, characterized in that: The first disc spring piece and the second disc spring piece of the disc spring group are both provided with openings, and the column body of the movable column is inserted into the openings so that the disc spring group is sleeved on the column body.

6. A polyurethane mixing gun head according to claim 4, characterized in that: The transverse cross section of the movable column is T-shaped.

7. A polyurethane mixing gun tip according to claim 1, characterized in that: The guide groove is arranged at the bottom of the recess, and the guide groove has the same longitudinal cross-sectional shape as that of the movable column.

8. A polyurethane mixing gun tip according to claim 7, characterized in that: The longitudinal cross sections of the guide groove and the movable column are both circular.

9. The polyurethane mixing gun tip according to claim 1, characterized in that: A heat insulation pad is also provided between the main body and the cylinder.

10. The polyurethane mixing gun tip according to claim 9, characterized in that: A sealing ring which is sleeved on the cylinder column is arranged in the thermal insulation pad.

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