High-pressure injection device with a pressure-balancing structure

Abstract

The present invention belongs to the technical field of sponge production, and particularly relates to a high-pressure spraying device with a pressure-balancing structure, which includes a nozzle seat, a spraying valve seat, a connecting seat, a high-pressure cylinder and a liquid ejecting piston; a liquid storage cavity is arranged in the spraying valve seat, and a liquid injection hole is arranged at the side end of the spraying valve seat; a liquid spraying hole is arranged on the nozzle seat; a pressure regulating cavity and a regulating piston rod are arranged in the connecting seat; the high-pressure cylinder is connected to the connecting seat and is connected to the regulating piston rod; the liquid ejecting piston is arranged in the liquid storage cavity and is slidably connected to the spraying valve seat; the liquid ejecting piston is provided with a contact surface; when the sponge foaming mixture is introduced through the liquid injection hole, the contact surface contacts the sponge foaming mixture and under its fluid pressure, the liquid ejecting piston moves in a direction away from the liquid spraying hole, and the moving end of the high-pressure cylinder drives the liquid ejecting piston to compress the sponge foaming mixture to be sprayed, so that the fluid pressure of the sponge foaming mixture cancels out the thrust of the high-pressure cylinder, thereby realizing the high-pressure and constant-pressure spraying of the sponge foaming mixture from the liquid spraying hole.

Description

Technical Field

[0001] The present invention belongs to the technical field of sponge production, and particularly relates to a high-pressure spraying device with a pressure-balancing structure. Background Art

[0002] Polyurethane soft foam rubber, polyurethane is one of the most common polymer materials in life, and is widely used in the production of various "sponge" products. And elastic materials for shock absorption and anti-friction purposes, such as shoe soles, and the lining of tractor and tank tracks. Mix the foaming resin, foaming aids and adhesive resin (to make the finished product adhesive) together and carry out foaming processing in the mixing chamber. Most of the components of the sponge are polyurethane. Just like foaming, the same material with different manufacturing processes will produce different things. PU sponges mainly include polyester and polyether types, which can be sliced or roll-cut, and can also be compounded, hot-pressed and burst-opening processed according to customer requirements. Due to its characteristics such as heat preservation, heat insulation, sound absorption, shock absorption, flame retardancy, anti-static, and good air permeability, PU sponges are involved in various industries, including the automotive industry, battery industry, cosmetics industry, bust underwear manufacturing industry, and high-end furniture manufacturing industry, etc.

[0003] However, the existing high-pressure spraying device for sponge foaming mixture includes a liquid spraying hole for spraying the sponge foaming mixture and a plug top needle for blocking the liquid spraying hole. The sponge foaming mixture liquid jacks up the plug top needle through fluid pressure and then sprays out from the liquid spraying hole, so as to achieve high-pressure spraying. However, due to the limited force-bearing area of the liquid sprayed out from the liquid spraying hole acting on the plug, it is easy to cause problems such as unstable pressure, difficult precise adjustment of the pressure of the sprayed sponge foaming mixture, and easy shaking of the plug top needle, which greatly reduces the production efficiency of sponge foaming; and when multiple spraying devices are used, since the sponge foaming mixture is traditionally shunted to each spraying device through pipelines, if there is a time error, it will cause only a small amount of sponge foaming mixture to be sprayed out by some spraying devices, or the liquid spraying hole cannot spray out liquid due to the small pressure of the sponge foaming mixture. Summary of the Invention

[0004] The purpose of the present invention is to provide a high-pressure spraying device with a pressure-balancing structure, aiming to solve the technical problems of unstable spraying pressure, difficult precise adjustment of the pressure of the sprayed sponge foaming mixture, and easy shaking of the plug top needle in the existing spraying device.

[0005] To achieve the above object, an embodiment of the present invention provides a high-pressure injection device with a pressure-balancing structure, which includes a nozzle seat, an injection valve seat, a connection seat, a high-pressure cylinder, and a liquid-pushing piston; the interior of the injection valve seat is hollow to form a liquid storage cavity, and a liquid injection hole communicating with the liquid storage cavity is provided at the side end of the injection valve seat; the nozzle seat is connected to the bottom of the injection valve seat, and a liquid spraying hole communicating with the liquid storage cavity is provided on the nozzle seat; the liquid injection hole is arranged close to the nozzle seat; the connection seat is connected to one end of the injection valve seat away from the nozzle seat, a pressure regulating cavity is provided in the connection seat, and an adjusting rod slidably connected to the connection seat is provided in the pressure regulating cavity; the high-pressure cylinder is connected to one end of the connection seat away from the injection valve seat, and the moving end of the high-pressure cylinder extends into the connection seat and is connected to the adjusting rod; the liquid-pushing piston is arranged in the liquid storage cavity and is slidably connected to the injection valve seat, and the side end surface of the liquid-pushing piston fits with the side surface of the liquid storage cavity; a horizontally arranged contact surface is provided on the side of the liquid-pushing piston facing the liquid spraying hole; one end of the liquid-pushing piston away from the adjusting rod blocks the liquid spraying hole. When the liquid injection hole is filled with sponge foaming mixture and flows into the liquid storage cavity, the contact surface contacts the sponge foaming mixture and moves the liquid-pushing piston in a direction away from the liquid spraying hole under its fluid pressure until the liquid-pushing piston disengages from the liquid spraying hole.

[0006] Optionally, the connection seat is provided with a first connection hole, a second connection hole, a third connection hole, and a fourth connection hole all communicating with the pressure regulating cavity. The first connection hole and the second connection hole are located on the same side and are arranged vertically opposite to each other; the third connection hole and the fourth connection hole are located on the same side and are arranged vertically opposite to each other; the first connection hole and the third connection hole are arranged at the same horizontal height, and the second connection hole and the fourth connection hole are arranged at the same horizontal height.

[0007] Optionally, the adjusting rod includes a pressure regulating block and a limiting part; the length of the pressure regulating block is less than the distance between the first connection hole and the second connection hole, the width of the pressure regulating block is greater than the width of the limiting part, and the side end surface of the pressure regulating block fits with the side end surface of the pressure regulating cavity; the limiting parts are arranged at both ends of the pressure regulating block, and a vertically extending rod body is provided at the end of the limiting part away from the pressure regulating block; one rod body passes through the connection seat and is connected to the moving end of the high-pressure cylinder, and the other rod body passes through the connection seat and is connected to the liquid-pushing piston.

[0008] Optionally, the distance from the first connection hole to the top of the pressure regulating cavity is less than the length of the limiting part; the distance from the second connection hole to the bottom of the pressure regulating cavity is less than the length of the limiting part.

[0009] Optionally, one end of the connecting seat away from the high-pressure cylinder is embedded in the injection valve seat, and a boss is provided on the connecting seat, and a mating groove for mating with the boss is provided on the injection valve seat.

[0010] Optionally, the liquid ejecting piston includes a piston block and a plug head thimble connected integrally, the diameter of the plug head thimble is smaller than that of the piston block, and the piston block is located above the liquid injection hole; the piston block is arranged in the liquid storage cavity and is slidably connected with the injection valve seat; the piston block is connected with the adjusting rod.

[0011] Optionally, a tapered head is provided at one end of the plug head thimble away from the piston block; a tapered cavity communicating with the liquid spraying hole and arranged in a tapered shape is provided in the nozzle seat, and the taper is the same as that of the tapered head; the diameter of the tapered cavity gradually decreases along the direction close to the liquid spraying hole.

[0012] Optionally, a guiding inclined surface is provided at one end of the liquid spraying hole close to the liquid storage cavity, and the guiding inclined surface is annular and fits with the side surface of the tapered head.

[0013] Optionally, the distance from the contact surface to the bottom of the liquid storage cavity is greater than the distance from the liquid injection hole to the bottom of the liquid storage cavity.

[0014] Optionally, a nozzle head extends outward from one side of the nozzle seat away from the injection valve seat, and the injection hole penetrates through the nozzle head.

[0015] One or more of the above technical solutions in the high-pressure injection device with a pressure-balancing structure provided by the embodiments of the present invention have at least the following technical effects: In the high-pressure injection device with a pressure-balancing structure provided by the embodiments of the present invention, the liquid storage cavity penetrates through both ends along the length direction of the injection valve seat, the liquid injection hole is opened at the side end of the injection valve seat and communicates with the liquid storage cavity, and the sponge foaming mixture is injected into the liquid storage cavity through the liquid injection hole; the nozzle seat is fixedly connected to the bottom of the injection valve seat, and relatively, the connecting seat is fixedly connected to the top of the injection valve seat, the liquid spraying hole communicates with the liquid storage cavity, and is used to release the sponge foaming mixture ejected under high pressure; since the liquid injection hole is arranged close to the nozzle seat, and when the sponge foaming mixture is not injected into the liquid storage cavity, one end of the liquid ejecting piston plugs the liquid spraying hole and seals the liquid spraying hole, preventing the sponge foaming mixture from directly leaking out of the liquid spraying hole when injecting the sponge foaming mixture, and not achieving the effect of high-pressure and constant-pressure injection of the sponge foaming mixture; the maximum width of the liquid ejecting piston is equal to the width of the liquid storage cavity, and since the liquid ejecting piston is slidably connected with the injection valve seat, it can slide in the liquid storage cavity, so as to realize injecting the sponge foaming mixture through the liquid injection hole, and the contact surface pushes the liquid ejecting piston to move under the pressure of the sponge foaming mixture; both ends of the adjusting rod penetrate through the connecting seat, and one end is connected to the high-pressure cylinder and the other end is connected to the liquid ejecting piston.

[0016] During use, a sponge foaming mixture is injected into the liquid injection hole, and the sponge foaming mixture flows into the liquid storage cavity. When the space surrounded by the top liquid piston, the side wall of the liquid storage cavity and the nozzle seat is filled with the sponge foaming mixture, continue to inject the sponge foaming mixture into the liquid injection hole. Since there is a certain space between the top of the liquid storage cavity and the top liquid piston at this time, under the action of the fluid pressure of the sponge foaming mixture, the top liquid piston squeezes the air at the top of the liquid storage cavity, causing the top liquid piston to move away from the liquid spraying hole until the end of the top liquid piston disengages from the liquid spraying hole; wherein, due to the setting of the contact surface, the contact area between the sponge foaming mixture and the top liquid piston is increased, and the pressure generated by the sponge foaming mixture injected into the liquid storage cavity and contacting the contact surface can lift the top liquid piston, releasing the liquid spraying hole. And due to the increase in the contact area, during the spraying process, the top liquid piston remains stable and is not prone to jitter, and the sprayed high-pressure sponge foaming mixture achieves a stable constant pressure effect; the top liquid piston drives the adjusting rod to move, and the moving end of the high-pressure cylinder drives the adjusting rod to move downward, and the adjusting rod acts on the top liquid piston to compress the sponge foaming mixture to be sprayed, so that the fluid pressure of the sponge foaming mixture cancels out the thrust of the high-pressure cylinder, thereby realizing the high-pressure and constant-pressure spraying of the sponge foaming mixture from the liquid spraying hole. Description of the Drawings

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0018] Figure 1 It is a schematic structural diagram of a high-pressure spraying device with a pressure-balancing structure provided by an embodiment of the present invention.

[0019] Figure 2 It is a sectional view of a high-pressure spraying device with a pressure-balancing structure provided by an embodiment of the present invention.

[0020] Figure 3 It is a schematic structural diagram of a plurality of high-pressure spraying devices with a pressure-balancing structure connected provided by an embodiment of the present invention.

[0021] Figure 4 It is a partial schematic structural diagram of a high-pressure spraying device with a pressure-balancing structure provided by an embodiment of the present invention.

[0022] Among them, the reference numerals in the drawings are as follows:

[0023] 10 - nozzle seat, 11 - liquid spraying hole, 12 - conical cavity

[0024] 13 - nozzle head, 20 - injection valve seat, 21 - liquid storage cavity

[0025] 22 - Liquid injection hole 30 - Connecting seat 31 - Pressure regulating cavity

[0026] 32 - Adjusting rod 33 - First connection hole 34 - Second connection hole

[0027] 35 - Third connection hole 36 - Fourth connection hole 37 - Boss

[0028] 40 - High - pressure cylinder 50 - Liquid ejecting piston 51 - Contact surface

[0029] 52 - Piston block 53 - Plug head thimble 121 - Guide inclined surface

[0030] 321 - Pressure regulating block 322 - Limiting part 323 - Rod body

[0031] 531 - Tapered head. Detailed implementation mode

[0032] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The following is through reference to the attached Figures 1 to 4 The described embodiments are exemplary and are intended to explain the embodiments of the present invention, and should not be construed as limiting the present invention.

[0033] In the description of the embodiments of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

[0034] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of the present invention, the meaning of "a plurality" is two or more unless otherwise specifically defined.

[0035] In the embodiments of the present invention, unless otherwise clearly specified and defined, terms such as "installation", "connection", "linkage", "fixation", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0036] In one embodiment of the present invention, as Figures 1 to 4 shown, a high-pressure injection device with a pressure-balancing structure is provided, which includes a nozzle seat 10, an injection valve seat 20, a connection seat 30, a high-pressure cylinder 40, and a liquid ejecting piston 50. The inside of the injection valve seat 20 is hollow to form a liquid storage cavity 21, and a liquid injection hole 22 communicating with the liquid storage cavity 21 is provided at the side end of the injection valve seat 20. The nozzle seat 10 is connected to the bottom of the injection valve seat 20, and a liquid spraying hole 11 communicating with the liquid storage cavity 21 is provided on the nozzle seat 10. The liquid injection hole 22 is arranged close to the nozzle seat 10. The connection seat 30 is connected to one end of the injection valve seat 20 away from the nozzle seat 10. A pressure regulating cavity 31 is provided inside the connection seat 30, and a regulating piston rod 32 slidably connected to the connection seat 30 is provided in the pressure regulating cavity 31. The high-pressure cylinder 40 is connected to one end of the connection seat 30 away from the injection valve seat 20, and the moving end of the high-pressure cylinder 40 extends into the connection seat 30 and is connected to the regulating piston rod 32. The liquid ejecting piston 50 is arranged in the liquid storage cavity 21 and is slidably connected to the injection valve seat 20. The side end face of the liquid ejecting piston 50 is attached to the side face of the liquid storage cavity 21. A horizontally arranged contact surface 51 is provided on the side of the liquid ejecting piston 50 facing the liquid spraying hole 11. One end of the liquid ejecting piston 50 away from the regulating piston rod 32 blocks the liquid spraying hole 11. When the liquid injection hole 22 is filled with a sponge foaming mixture and flows into the liquid storage cavity 21, the contact surface 51 contacts the sponge foaming mixture and under its fluid pressure, the liquid ejecting piston 50 moves in a direction away from the liquid spraying hole 11 until the liquid ejecting piston 50 disengages from the liquid spraying hole 11.

[0037] Specifically, for the high-pressure injection device with a pressure-balancing structure provided by the embodiments of the present invention, the side end face of the liquid-pushing piston 50 is attached to the side face of the liquid storage cavity 21, so that the liquid storage cavity 21 is divided into two non-communicating cavities by the liquid-pushing piston 50; the liquid storage cavity 21 penetrates through both ends along the length direction of the injection valve seat 20, and the liquid injection hole 22 is opened on the side end of the injection valve seat 20 and communicated with the liquid storage cavity 21, and the sponge foaming mixture is injected into the liquid storage cavity 21 through the liquid injection hole 22; the nozzle seat 10 is fixedly connected to the bottom of the injection valve seat 20, and correspondingly, the connecting seat 30 is fixedly connected to the top of the injection valve seat 20, and the liquid spraying hole 11 is communicated with the liquid storage cavity 21 for releasing the sponge foaming mixture ejected under high pressure; since the liquid injection hole 22 is arranged close to the nozzle seat 10, and when the sponge foaming mixture is not injected into the liquid storage cavity 21, one end of the liquid-pushing piston 50 blocks the liquid spraying hole 11 and seals the liquid spraying hole 11 to prevent the sponge foaming mixture from directly leaking out of the liquid spraying hole 11 when the sponge foaming mixture is injected, and the effect of high-pressure and constant-pressure injection of the sponge foaming mixture cannot be achieved; the maximum width of the liquid-pushing piston 50 is equal to the width of the liquid storage cavity 21, and since the liquid-pushing piston 50 is slidably connected to the injection valve seat 20, it can slide in the liquid storage cavity 21, so that the sponge foaming mixture is injected through the liquid injection hole 22, and the contact surface 51 pushes the liquid-pushing piston 50 to move under the pressure of the sponge foaming mixture; both ends of the adjusting rod 32 penetrate through the connecting seat 30, one end is connected to the high-pressure cylinder 40, and the other end is connected to the liquid-pushing piston 50; the side wall of the liquid-pushing piston 50 extends towards the side wall of the liquid storage cavity 21, thus increasing the area of the contact surface 51

[0038] In use, a sponge foaming mixture is injected into the liquid injection hole 22. The sponge foaming mixture flows into the liquid storage cavity 21. When the space enclosed by the top liquid piston 50, the side wall of the liquid storage cavity 21 and the nozzle seat 10 is filled with the sponge foaming mixture, continue to inject the sponge foaming mixture into the liquid injection hole 22. Since there is a certain space between the top of the liquid storage cavity 21 and the top liquid piston 50 at this time, under the action of the fluid pressure of the sponge foaming mixture, the top liquid piston 50 squeezes the air at the top of the liquid storage cavity 21, causing the top liquid piston 50 to move away from the liquid spraying hole 11 until the end of the top liquid piston 50 disengages from the liquid spraying hole 11. Among them, due to the setting of the contact surface 51, the contact area between the sponge foaming mixture and the top liquid piston 50 is increased. The pressure generated when the sponge foaming mixture is injected into the liquid storage cavity 21 and contacts the contact surface 51 can lift the top liquid piston 50, releasing the liquid spraying hole 11. And due to the increase in the contact area, during the spraying process, the top liquid piston 50 remains stable and is not prone to jitter, and the ejected high-pressure sponge foaming mixture achieves a stable constant pressure effect. The top liquid piston 50 drives the adjusting rod 32 to move, while the moving end of the high-pressure cylinder 40 drives the adjusting rod 32 to move downward. The adjusting rod 32 acts on the top liquid piston 50 to compress the sponge foaming mixture to be sprayed, so that the fluid pressure of the sponge foaming mixture cancels out the thrust of the high-pressure cylinder 40, thereby realizing the high-pressure and constant-pressure spraying of the sponge foaming mixture from the liquid spraying hole 11.

[0039] To further explain the function of the contact surface 51, a specific example is given: When the spraying device requires a spraying pressure of 100 kg to stably spray the sponge foaming mixture, the traditional spraying device sprays the sponge foaming mixture at the end of the top liquid piston 50 to lift the top liquid piston 50. This requires the sponge foaming mixture to act on the top of the top liquid piston 50 with a fluid pressure of 10 kg to lift it, so as to achieve spraying. However, in actual use, if the spraying pressure of 100 kg is adjusted to the required 98 kg, the fluid pressure of the sponge foaming mixture needs to be adjusted to 9.8 kg accordingly. Then, the fluid pressure of the sponge foaming mixture introduced into the spraying device needs to be adjusted by 0.2 kg. In actual production, due to the too small adjustment range and high precision, it is extremely difficult and inconvenient to achieve. Through the setting of the contact surface of the present invention, the sponge foaming mixture is introduced into the liquid storage cavity 21, and the generated fluid pressure directly acts on the contact surface 51 of the top liquid piston 50. Since the contact area increases, a greater fluid pressure is required to lift the top liquid piston 50 to release the liquid spraying hole 11. When the spraying device requires a spraying pressure of 100 kg to stably spray the sponge foaming mixture, the fluid pressure of the sponge foaming mixture injected into the liquid storage cavity 21 also needs to be 100 kg to lift the top liquid piston 50 to release the liquid spraying hole 11; when it is necessary to adjust the spraying pressure of 100 kg to the required 98 kg, the fluid pressure of the sponge foaming mixture needs to be adjusted to 98 kg accordingly. The adjustment range of the fluid pressure is 2 kg. In this way, it is easier to adjust the pressure of the sprayed sponge foaming mixture, which is more in line with actual production applications. Moreover, the top liquid piston 50 is stable and does not shake during the spraying process, and the sprayed sponge foaming mixture is at high pressure and constant pressure.

[0040] In another embodiment of the present invention, as Figures 1 to 3 shown, the connecting seat 30 is provided with a first connecting hole 33, a second connecting hole 34, a third connecting hole 35 and a fourth connecting hole 36 that are all communicated with the pressure regulating cavity 31. The first connecting hole 33 and the second connecting hole 34 are located on the same side and are arranged vertically opposite to each other; the third connecting hole 35 and the fourth connecting hole 36 are located on the same side and are arranged vertically opposite to each other; the first connecting hole 33 and the third connecting hole 35 are arranged at the same horizontal height, and the second connecting hole 34 and the fourth connecting hole 36 are arranged at the same horizontal height.

[0041] Specifically, the first connection hole 33, the second connection hole 34, the third connection hole 35, and the fourth connection hole 36 are all opened at the side end of the connection seat 30. The first connection hole 33 and the second connection hole 34 are on the same side, and the third connection hole 35 and the fourth connection hole 36 are on the same side. Among them, the first connection hole 33 is located above the second connection hole 34, and the first connection hole 33 and the second connection hole 34 are spaced apart; the third connection hole 35 is located above the fourth connection hole 36, and the third connection hole 35 and the fourth connection hole 36 are spaced apart; the first connection hole 33 and the third connection hole 35 are at the same horizontal height and are arranged close to the top of the pressure regulating cavity 31, and the second connection hole 34 and the fourth connection hole 36 are at the same horizontal height and are arranged close to the top of the pressure regulating cavity 31. When multiple injection devices need to be connected, the third connection hole 35 and the fourth connection hole 36 of the previous injection device are respectively connected to the corresponding second connection hole 34 and the first connection hole 33 of the next injection device through pipelines, that is, the first connection hole 33, the second connection hole 34, the third connection hole 35, and the fourth connection hole 36 of adjacent injection devices are connected in an alternating manner through pipelines. Thus, when the sponge foaming mixture is injected into the second connection hole 34 of the first injection device, the sponge foaming mixture enters the pressure regulating cavity 31 and enters the second connection hole 34 of the next injection device through the pipeline connected to the fourth connection hole 36. The same applies to multiple injection devices, so that the fluid pressure generated by the sponge foaming mixture in the pressure regulating cavity 31 of each injection device on the adjusting piston rod 32 is the same. Thus, it is ensured that the pressures of the sponge foaming mixture ejected by multiple injection devices are basically the same, and it is ensured that multiple injection devices can eject the sponge foaming mixture with high pressure and constant pressure simultaneously.

[0042] In another embodiment of the present invention, as Figures 2 to 4 shown, the adjusting piston rod 32 includes a pressure regulating block 321 and a limiting portion 322; the length of the pressure regulating block 321 is less than the distance between the first connection hole 33 and the second connection hole 34, the width of the pressure regulating block 321 is greater than the width of the limiting portion 322, and the side end surface of the pressure regulating block 321 is attached to the side end surface of the pressure regulating cavity 31; the limiting portion 322 is provided at both ends of the pressure regulating block 321, and a vertically extending rod body 323 is provided on the limiting portion 322 away from the pressure regulating block 321; one rod body 323 passes through the connection seat 30 and is connected to the moving end of the high-pressure cylinder 40, and the other rod body 323 passes through the connection seat 30 and is connected to the top liquid piston 50.

[0043] Specifically, the side wall of the pressure regulating block 321 is attached to the side wall of the pressure regulating cavity 31. In this way, the contact area 51 between the sponge foaming mixture and the pressure regulating block 321 in the pressure regulating cavity 31 can be increased, so that the pressure regulating block 321 can move stably under the fluid pressure generated by the sponge foaming mixture. Also, the pressure regulating cavity 31 can be divided into two non - communicating cavities by the pressure regulating block 321. One cavity communicates with the first connection hole 33 and the third connection hole 35, and the other cavity communicates with the second connection hole 34 and the third connection hole 35; the length of the pressure regulating block 321 is less than the distance between the first connection hole 33 and the second connection hole 34 to prevent the pressure regulating block 321 from being too long and blocking the passage of the sponge foaming mixture, affecting the use; the limiting parts 322 are arranged at the opposite ends of the pressure regulating block 321. The width of the pressure regulating block 321 is greater than the width of the limiting parts 322, and the width of the limiting parts 322 is greater than the width of the rod body 323.

[0044] In another embodiment of the present invention, as Figures 2 to 3 shown, the distance from the first connection hole 33 to the top of the pressure regulating cavity 31 is less than the length of the limiting part 322; the distance from the second connection hole 34 to the bottom of the pressure regulating cavity 31 is less than the length of the limiting part 322. Specifically, since the distance from the first connection hole 33 to the top of the pressure regulating cavity 31 is less than the length of the limiting part 322, it is ensured that when the limiting part 322 above the pressure regulating block 321 contacts the top of the connection seat 30, the first connection hole 33 and the third connection hole 35 are not blocked, and the sponge foaming mixture can be introduced into the first connection hole 33 to make corresponding adjustments to the injection pressure; since the distance from the second connection hole 34 to the top of the pressure regulating cavity 31 is less than the length of the limiting part 322, it is ensured that when the limiting part 322 above the pressure regulating block 321 contacts the top of the connection seat 30, the second connection hole 34 and the fourth connection hole 36 are not blocked.

[0045] In another embodiment of the present invention, as Figures 2 to 3 shown, one end of the connection seat 30 away from the high - pressure cylinder 40 is embedded in the injection valve seat 20, and a boss 37 is provided on the connection seat 30, and a mating groove for cooperating with the boss 37 is provided on the injection valve seat 20. Specifically, by assembling the boss 37 into the mating groove, the positioning of the connection seat 30 on the injection valve seat 20 is realized, which is convenient for fixing the connection seat 30 and fixing the connection seat 30 and the injection valve seat 20.

[0046] In another embodiment of the present invention, as Figures 2 to 4As shown, the top liquid piston 50 includes a piston block 52 and a plug head thimble 53 connected integrally. The diameter of the plug head thimble 53 is smaller than that of the piston block 52, and the piston block 52 is located above the liquid injection hole 22. The piston block 52 is arranged in the liquid storage cavity 21 and is slidably connected with the injection valve seat 20. The piston block 52 is connected with the adjusting live rod 32.

[0047] Specifically, the side wall of the piston block 52 is close to the side wall of the liquid storage cavity 21. In this way, the contact area 51 between the sponge foaming mixture and the piston block 52 in the liquid storage cavity 21 can be increased, so that the piston block 52 can move stably under the fluid pressure generated by the sponge foaming mixture. The diameter of the plug head thimble 53 is smaller than that of the piston block 52. When injecting the sponge foaming mixture into the liquid injection hole 22, the sponge foaming mixture fills the space surrounded by the side wall of the liquid storage cavity 21, the piston block 52 and the plug head thimble 53. Among them, the contact area 51 is arranged on the side where the piston block 52 is connected with the plug head thimble 53, and the fluid pressure generated by the sponge foaming mixture is applied to the contact area 51 to push the piston block 52 to move. Thus, the plug head thimble 53 is disengaged from the liquid spraying hole 11 to release the liquid spraying hole 11.

[0048] In another embodiment of the present invention, as Figures 2 to 4 shown, a tapered head 531 is provided at one end of the plug head thimble 53 away from the piston block 52. A tapered cavity 12 which is communicated with the liquid spraying hole 11 and is tapered is arranged in the nozzle seat 10, and the taper is the same as that of the tapered head 531. The diameter of the tapered cavity 12 gradually decreases along the direction close to the liquid spraying hole 11. Specifically, since the diameter of the tapered cavity 12 gradually decreases along the direction close to the liquid spraying hole 11, the tapered cavity 12 forms a pressurizing flow channel, and the volume of the sponge foaming mixture is compressed during the process of the sponge foaming mixture flowing towards the liquid spraying hole 11, so as to gradually increase the pressure of the sprayed sponge foaming mixture, and further achieve the purpose of high-pressure spraying of the sponge foaming mixture.

[0049] In another embodiment of the present invention, as Figures 2 to 4 shown, a guiding inclined surface 121 is provided at one end of the liquid spraying hole 11 close to the liquid storage cavity 21, and the guiding inclined surface 121 is annular and fits with the side surface of the tapered head 531. Specifically, the guiding inclined surface 121 is located at the end of the liquid spraying hole 11. The guiding inclined surface 121 is annular and conical, and the taper of the formed cone is the same as that of the tapered head 531. When the tapered head 531 contacts the guiding inclined surface 121, the side surface of the tapered head 531 fits with the guiding inclined surface 121, which can not only make the tapered head 531 fit tightly with the guiding inclined surface 121 to seal the liquid spraying hole 11, but also play a role in positioning and guiding the tapered head 531 to extend into the liquid spraying hole 11.

[0050] In another embodiment of the present invention, as Figures 1 to 2 shown, the distance from the contact surface 51 to the bottom of the liquid storage cavity 21 is greater than the distance from the liquid injection hole 22 to the bottom of the liquid storage cavity 21. Specifically, the distance from the contact surface 51 to the bottom of the liquid storage cavity 21 is greater than the distance from the liquid injection hole 22 to the bottom of the liquid storage cavity 21, so that when the liquid pushing piston 50 blocks the liquid spraying hole 11, the sponge foaming mixture can well enter the liquid storage cavity 21 through the liquid injection hole 22, realizing the generation of fluid pressure applied to the contact surface 51, and further pushing the liquid pushing piston 50 to move.

[0051] In another embodiment of the present invention, as Figures 1 to 4 shown, a nozzle head 13 extends outward from the side of the nozzle seat 10 away from the injection valve seat 20, and the injection hole penetrates through the nozzle head 13. Specifically, the high-pressure and constant-pressure sponge foaming mixture is sprayed through the nozzle head 13.

[0052] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A high-pressure injection device with a pressure-balancing structure, characterized in that: it includes a nozzle seat, an injection valve seat, a connection seat, a high-pressure cylinder, and a liquid-pushing piston; the inside of the injection valve seat is hollow to form a liquid storage cavity, and a liquid injection hole communicating with the liquid storage cavity is provided at the side end of the injection valve seat; the nozzle seat is connected to the bottom of the injection valve seat, and a liquid spraying hole communicating with the liquid storage cavity is provided on the nozzle seat; the liquid injection hole is arranged close to the nozzle seat; the connection seat is connected to one end of the injection valve seat away from the nozzle seat, a pressure-regulating cavity is arranged in the connection seat, and an adjusting rod slidably connected to the connection seat is arranged in the pressure-regulating cavity; the high-pressure cylinder is connected to one end of the connection seat away from the injection valve seat, and the moving end of the high-pressure cylinder extends into the connection seat and is connected to the adjusting rod; the liquid-pushing piston is arranged in the liquid storage cavity and is slidably connected to the injection valve seat, and the side end surface of the liquid-pushing piston fits with the side surface of the liquid storage cavity; a horizontally arranged contact surface is provided on the side of the liquid-pushing piston facing the liquid spraying hole; one end of the liquid-pushing piston away from the adjusting rod blocks the liquid spraying hole. When the liquid injection hole is filled with sponge foaming mixture and flows into the liquid storage cavity, the contact surface contacts the sponge foaming mixture and moves the liquid-pushing piston in the direction away from the liquid spraying hole under its fluid pressure until the liquid-pushing piston disengages from the liquid spraying hole; the connection seat is provided with a first connection hole, a second connection hole, a third connection hole, and a fourth connection hole all communicating with the pressure-regulating cavity. The first connection hole and the second connection hole are located on the same side and are arranged vertically opposite to each other; the third connection hole and the fourth connection hole are located on the same side and are arranged vertically opposite to each other; the first connection hole and the third connection hole are arranged at the same horizontal height, and the second connection hole and the fourth connection hole are arranged at the same horizontal height; the distance from the contact surface to the bottom of the liquid storage cavity is greater than the distance from the liquid injection hole to the bottom of the liquid storage cavity; a nozzle head extends outward from the side of the nozzle seat away from the injection valve seat, and the liquid spraying hole penetrates through the nozzle head.

2. The high-pressure injection device with a pressure-balancing structure according to claim 1, characterized in that: the adjusting rod includes a pressure-regulating block and a limiting part; the length of the pressure-regulating block is less than the distance between the first connection hole and the second connection hole, the width of the pressure-regulating block is greater than the width of the limiting part, and the side end surface of the pressure-regulating block fits with the side end surface of the pressure-regulating cavity; the limiting parts are arranged at both ends of the pressure-regulating block, and a vertically extending rod body is provided at the end of the limiting part away from the pressure-regulating block; one rod body passes through the connection seat and is connected to the moving end of the high-pressure cylinder, and the other rod body passes through the connection seat and is connected to the liquid-pushing piston.

3. The high-pressure injection device with a pressure-balancing structure according to claim 2, characterized in that: the distance from the first connection hole to the top of the pressure-regulating cavity is less than the length of the limiting part; the distance from the second connection hole to the bottom of the pressure-regulating cavity is less than the length of the limiting part.

4. The high-pressure injection device with a pressure-balancing structure according to any one of claims 1 to 3, characterized in that: One end of the connecting seat away from the high-pressure cylinder is embedded in the injection valve seat, and a boss is provided on the connecting seat, and a mating groove for cooperating with the boss is provided on the injection valve seat.

5. The high-pressure injection device with a pressure-balancing structure according to any one of claims 1 to 3, characterized in that: The liquid ejecting piston includes a piston block and a plug head thimble connected integrally. The diameter of the plug head thimble is smaller than the diameter of the piston block, and the piston block is located above the liquid injection hole; the piston block is arranged in the liquid storage cavity and is slidably connected with the injection valve seat; the piston block is connected with the adjusting rod.

6. The high-pressure injection device with a pressure-balancing structure according to claim 5, characterized in that: A tapered head is provided at one end of the plug head thimble away from the piston block; a tapered cavity that communicates with the liquid spraying hole and is tapered is provided in the nozzle seat, and the taper is the same as that of the tapered head; the diameter of the tapered cavity gradually decreases in the direction close to the liquid spraying hole.

7. The high-pressure injection device with a pressure-balancing structure according to claim 6, characterized in that: A guiding inclined surface is provided at one end of the liquid spraying hole close to the liquid storage cavity, and the guiding inclined surface is annular and fits with the side surface of the tapered head.

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