Hot melt adhesive hydraulic control system of injection molding machine

Abstract

The utility model discloses a hot melt adhesive hydraulic control system of an injection molding machine, which comprises a platform moving oil cylinder, an injection oil cylinder, an adhesive melting motor and an integrated block, a check valve, a back pressure valve, a pressure regulating valve, an overflow valve, a first two-position four-way directional valve, a second two-position four-way directional valve, a first three-position four-way directional valve and a second three-position four-way directional valve are arranged on the side portion of the integrated block. A plurality of oil way channels are arranged on the side portion of the integrated block. The oil way channels comprise the first oil way channel, the second oil way channel, the third oil way channel, the fourth oil way channel, the fifth oil way channel, the sixth oil way channel, the seventh oil way channel, the eighth oil way channel and the ninth oil way channel. The utility model can solve the problems that the manufacturing cost of equipment is greatly increased, and the failure rate and the maintenance cost of the equipment are also increased due to the high price of a closed nozzle which is often adopted for solving the glue leakage phenomenon of the nozzle during glue melting because the viscosity of a hot melt of a flexible glue material is relatively small.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of hydraulic control, specifically is hot melt adhesive hydraulic control system of injection molding machine. BACKGROUND

[0002] Injection molding machine is a kind of plastic forming machine, its working principle is that granular plastic raw materials are entered into the propulsion cavity of screw through hopper feeder, are heated and stabilized at the set temperature value of system after heating system, are cut and plasticized into viscous liquid state by screw, then, high-temperature molten plastic is pushed into the closed mold cavity at a certain speed by the injection mechanism such as injection hydraulic cylinder piston to push screw forward, keeps a certain pressure for a period of time, after cooling, the molded plastic product is ejected, and the whole process of injection is completed.In injection molding machine, the main function of hydraulic system is to provide power and control for injection mechanism, mold closing mechanism and the like.Because the different plastic raw materials, its performance is also different, and the viscosity of hot melt is also very different, such as common PC, PMMA and other materials, hot melt viscosity is relatively large, to improve the strength of plastic product, certain back pressure is needed when melting glue, to give hot melt certain pressure to improve its density, and the hot melt viscosity of soft glue material is relatively small, to solve the problem of glue leakage of nozzle when melting glue, closed nozzle scheme is often used, because of its high price, it greatly increases the manufacturing cost of equipment, also increases the failure rate and maintenance cost of equipment. CONTENT OF UTILITY MODEL

[0003] The utility model provides a kind of hot melt adhesive hydraulic control system of injection molding machine, can solve the problem that because the hot melt viscosity of soft glue material is relatively small, to solve the phenomenon of glue leakage of nozzle when melting glue, closed nozzle scheme is often used, because of its high price, it greatly increases the manufacturing cost of equipment, also increases the failure rate and maintenance cost of equipment.

[0004] In order to achieve the above object, the utility model provides the following technical scheme: A hot melt glue hydraulic control system of injection molding machine, including moving platform oil cylinder, injection cylinder, melt glue motor and integrated block, the side of integrated block is provided with check valve, back pressure valve, pressure regulating valve, overflow valve, two position four way valve no. One, two position four way valve no. Two, three position four way valve no. One and three position four way valve no. Two, the side of integrated block is provided with a plurality of oil passage, the oil passage includes first oil passage, second oil passage, third oil passage, fourth oil passage, fifth oil passage, sixth oil passage, seventh oil passage, eighth oil passage and ninth oil passage, and a plurality of oil passages are used for oil inlet, oil return and connecting each hydraulic actuator, the system can control the flow of hot melt glue more accurately, thereby improving the size accuracy and quality of injection molding product, reduce the glue nozzle glue leakage phenomenon when melting, the A mouth of three position four way valve no. One is connected with the rodless cavity of moving platform oil cylinder through third oil passage, the B mouth of three position four way valve no. One is connected with the rod cavity of moving platform oil cylinder through fourth oil passage, the P mouth of three position four way valve no. One is connected with first oil passage through check valve, the T mouth of three position four way valve no. One is connected with second oil passage, and the advance and retreat of moving platform oil cylinder are completed, the A mouth of three position four way valve no. Two is connected with the relaxation cavity of injection cylinder through fifth oil passage, the B mouth of three position four way valve no. Two is connected with the glue injection cavity of injection cylinder through sixth oil passage, the P mouth of three position four way valve no. Two is connected with first oil passage, the T mouth of three position four way valve no. Two is connected with second oil passage through pressure regulating valve, and the advance and retreat of injection cylinder are completed.

[0005] As preferred, the A mouth of two position four way valve no. One is connected with the B mouth of three position four way valve no. Two, the B mouth of two position four way valve no. One is connected with the oil inlet of melt glue motor through seventh oil passage, the P mouth of two position four way valve no. One is connected with first oil passage, and the T mouth of two position four way valve no. One is connected with second oil passage through back pressure valve, and the melt glue motor is controlled.

[0006] As preferred, the oil outlet of melt glue motor is connected with ninth oil passage, the other end of ninth oil passage is connected with second oil passage through pressure regulating valve, the pressure regulating oil of melt glue motor flows out through pressure regulating valve and second oil passage to external hydraulic oil tank, also passes through three position four way valve no. Two and fifth oil passage, enters the relaxation cavity of injection cylinder to supplement pressure regulating oil, and the oil return of glue injection cavity of injection cylinder, after sixth oil passage, passes through two position four way valve no. One and back pressure valve, and flows out to external hydraulic oil tank through second oil passage.

[0007] As preferred, the front side of the integrated block is provided with a first pressure gauge and a second pressure gauge for displaying pressure.

[0008] As preferred, the first pressure gauge is connected with the pressure regulating valve, and the pressure regulated by the pressure regulating valve is displayed by the pressure gauge.

[0009] As preferred, the second pressure gauge is connected with the back pressure valve through the eighth oil passage, and the pressure value of the hydraulic oil is displayed by the back pressure valve.

[0010] Compared with the prior art, the utility model has the beneficial effects that:

[0011] The hydraulic control system is designed by the integrated block, integrates multiple control valves and oil passages, and the accurate control of the three-position four-way directional valve and the two-position four-way directional valve makes the movement of the table cylinder, the injection cylinder and the glue melting motor more accurate, can more accurately control the flow of hot melt glue, can ensure the consistency and stability of injection molding products, improve product quality, improve production efficiency, reduce maintenance cost, the cooperation of the pressure regulating valve and the back pressure valve can stabilize the system pressure, the real-time monitoring of the first pressure gauge and the second pressure gauge makes the operator be able to find and adjust the system pressure in time, ensures the smooth progress of the injection molding process. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is the three-dimensional structure diagram of the utility model;

[0013] Figure 2 It is the three-dimensional structure diagram of the hydraulic control system of the utility model;

[0014] Figure 3 It is the three-dimensional structure diagram of the hydraulic control system of the utility model;

[0015] Figure 4 It is the schematic diagram of the oil passage of the utility model;

[0016] Figure 5 It is the principle diagram of the utility model.

[0017] Reference signs:

[0018] 1, integrated block, 2, three-position four-way directional valve one, 3, check valve, 4, three-position four-way directional valve two, 5, two-position four-way directional valve one, 6, back pressure valve, 7, overflow valve, 8, two-position four-way directional valve two, 9, pressure regulating valve, 10, second pressure gauge, 11, first pressure gauge, 12, moving table oil cylinder, 13, injection oil cylinder, 14, glue melting motor, 15, oil passage, 151, first oil passage, 152, second oil passage, 153, third oil passage, 154, fourth oil passage, 155, fifth oil passage, 156, sixth oil passage, 157, seventh oil passage, 158, eighth oil passage, 159, ninth oil passage. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model.

[0020] As Figures 1-5The utility model discloses a hot melt glue hydraulic control system of injection molding machine, including moving table oil cylinder 12, injection oil cylinder 13, melt glue motor 14 and integrated block 1, the side of integrated block 1 is provided with check valve 3, back pressure valve 6, pressure regulating valve 9, overflow valve 7, two position four way valve one 5, two position four way valve two 8, three position four way valve one 2 and three position four way valve two 4, the side of integrated block 1 is provided with several oil passage 15, the oil passage 15 includes first oil passage 151, second oil passage 152, third oil passage 153, fourth oil passage 154, fifth oil passage 155, sixth oil passage 156, seventh oil passage 157, eighth oil passage 158 and ninth oil passage 159, and first oil passage 151 is the oil inlet passage, and second oil passage 152 is the oil return passage, and multiple oil passages are used for oil inlet, oil return and connecting each hydraulic actuating element, and the system can more accurately control the flow of hot melt glue, thereby improving the size precision and quality of injection molding product, and reducing the nozzle leakage phenomenon when melting glue, the A mouth of three position four way valve one 2 is connected with the rodless cavity of moving table oil cylinder 12 through third oil passage 153, the B mouth of three position four way valve one 2 is connected with the rod cavity of moving table oil cylinder 12 through fourth oil passage 154, the P mouth of three position four way valve one 2 is connected with first oil passage 151 through check valve 3, the T mouth of three position four way valve one 2 is connected with second oil passage 152, and the required high-pressure oil is provided by external power station, and high-pressure oil enters integrated block 1 through first oil passage 151 and passes through check valve 3, then passes through the P mouth, A mouth of three position four way valve one 2 and third oil passage 153 and enters the rodless cavity of moving table oil cylinder 12, and moving table oil cylinder 12 carries out forward action, when high-pressure oil enters integrated block 1 through first oil passage 151 and continues to pass through check valve 3 and the P mouth, B mouth of three position four way valve one 2 and fourth oil passage 154 and enters the rod cavity of moving table oil cylinder 12, and moving table oil cylinder 12 carries out backward action.The A port of the three-position four-way directional valve two 4 is connected with the releasing cavity of the injection oil cylinder 13 through the fifth oil passage 155, the B port of the three-position four-way directional valve two 4 is connected with the glue injection cavity of the injection oil cylinder 13 through the sixth oil passage 156, the P port of the three-position four-way directional valve two 4 is connected with the first oil passage 151, and the T port of the three-position four-way directional valve two 4 is connected with the second oil passage 152 through the pressure regulating valve 9. The required high-pressure oil is provided by an external power station, the high-pressure oil enters the inside of the integrated block 1 through the first oil passage 151, enters the releasing cavity of the injection oil cylinder 13 through the P port and the A port of the three-position four-way directional valve two 4 and the fifth oil passage 155, and the advancing action of the injection oil cylinder 13 is completed; when the high-pressure oil enters the inside of the integrated block 1 through the first oil passage 151, enters the glue injection cavity of the injection oil cylinder 13 through the P port and the B port of the three-position four-way directional valve two 4 and the sixth oil passage 156, the retracting action of the injection oil cylinder 13 is completed.

[0021] In the embodiment, as shown in the figure, Figure 5 the A port of the two-position four-way directional valve one 5 is connected with the B port of the three-position four-way directional valve two 4, the B port of the two-position four-way directional valve one 5 is connected with the oil inlet of the glue melting motor 14 through the seventh oil passage 157, the P port of the two-position four-way directional valve one 5 is connected with the first oil passage 151, and the T port of the two-position four-way directional valve one 5 is connected with the second oil passage 152 through the back pressure valve 6. The required high-pressure oil is provided by an external power station, the high-pressure oil enters the inside of the integrated block 1 through the first oil passage 151, enters the glue melting motor 14 through the P port and the B port of the two-position four-way directional valve one 5 and the seventh oil passage 157.

[0022] In the embodiment, as shown in the figure, Figure 5 the oil outlet of the glue melting motor 14 is connected with the ninth oil passage 159, the other end of the ninth oil passage 159 is connected with the second oil passage 152 through the pressure regulating valve 9, the pressure regulating oil flowing out of the glue melting motor 14 flows out to an external hydraulic oil tank through the B port and the T port of the two-position four-way directional valve two 8 and the second oil passage 152; when the pressure regulating valve 9 is energized, the pressure regulating oil flowing out of the glue melting motor 14 flows out to the external hydraulic oil tank through the pressure regulating valve 9 and the second oil passage 152, and the pressure regulating oil flowing out of the glue melting motor 14 also enters the releasing cavity of the injection oil cylinder 13 through the three-position four-way directional valve two 4 and the fifth oil passage 155 to supplement the pressure regulating oil, and the oil back of the glue injection cavity of the injection oil cylinder 13 flows out to the external hydraulic oil tank through the sixth oil passage 156, the back pressure valve 6, the A port and the T port of the two-position four-way directional valve one 5 and the second oil passage 152.

[0023] In the embodiment, as shown in the figure, Figure 2As shown, a first pressure gauge 11 and a second pressure gauge 10 are provided on the front side of the integrated block 1 for displaying pressure.

[0024] In this embodiment, if Figure 5 As shown, the first pressure gauge 11 is connected to the pressure regulating valve 9 , and the pressure regulated by the pressure regulating valve 9 is displayed by the pressure gauge 11 .

[0025] In this embodiment, if Figure 5 As shown, the second pressure gauge 10 is connected to the back pressure valve 6 through the eighth oil passage 158 , and the back pressure valve 6 displays the pressure value of the hydraulic oil through the pressure gauge 10 .

[0026] 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.

[0027] In addition, the terms "first," "second," and so on, used in this utility model are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0028] In this utility model, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0029] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in this field can implement it. 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 this utility model.

Claims

1. A hot melt adhesive hydraulic control system for an injection molding machine, comprising a platform cylinder (12), an injection cylinder (13), a melt adhesive motor (14) and an integrated block (1), characterized in that: The side of the integrated block (1) is provided with a check valve (3), a back pressure valve (6), a pressure regulating valve (9), a relief valve (7), a two-position four-way directional valve (5), a two-position four-way directional valve (8), a three-position four-way directional valve (2), and a three-position four-way directional valve (4). The side of the integrated block (1) is provided with a plurality of oil passages (15), the oil passages (15) including a first oil passage (151), a second oil passage (152), a third oil passage (153), a fourth oil passage (154), a fifth oil passage (155), a sixth oil passage (156), a seventh oil passage (157), an eighth oil passage (158), and a ninth oil passage (159); The A port of the three-position four-way directional valve (2) is connected to the rodless chamber of the platform oil cylinder (12) through the third oil passage (153), the B port of the three-position four-way directional valve (2) is connected to the rod chamber of the platform oil cylinder (12) through the fourth oil passage (154), the P port of the three-position four-way directional valve (2) is connected to the first oil passage (151) through the check valve (3), and the T port of the three-position four-way directional valve (2) is connected to the second oil passage (152); The A port of the second three-position four-way directional valve (4) is connected to the release chamber of the injection cylinder (13) through the fifth oil passage (155), the B port of the second three-position four-way directional valve (4) is connected to the injection chamber of the injection cylinder (13) through the sixth oil passage (156), the P port of the second three-position four-way directional valve (4) is connected to the first oil passage (151), and the T port of the second three-position four-way directional valve (4) is connected to the second oil passage (152) through the pressure regulating valve (9).

2. The hot melt adhesive hydraulic control system for an injection molding machine according to claim 1, characterized in that: The A port of the two-position four-way directional valve (5) is connected to the B port of the three-position four-way directional valve (4), the B port of the two-position four-way directional valve (5) is connected to the oil inlet of the melt motor (14) through the seventh oil passage (157), the P port of the two-position four-way directional valve (5) is connected to the first oil passage (151), and the T port of the two-position four-way directional valve (5) is connected to the second oil passage (152) through the back pressure valve (6).

3. The hot melt adhesive hydraulic control system for an injection molding machine according to claim 1, characterized in that: The oil outlet of the melt motor (14) is connected to the ninth oil channel (159), and the other end of the ninth oil channel (159) is connected to the second oil channel (152) via the pressure regulating valve (9).

4. The hot melt adhesive hydraulic control system for an injection molding machine according to claim 1, characterized in that: A first pressure gauge (11) and a second pressure gauge (10) are provided on the front side of the integrated block (1).

5. The hot melt adhesive hydraulic control system for an injection molding machine according to claim 4, characterized in that: The first pressure gauge (11) is connected to the pressure regulating valve (9).

6. The hot melt adhesive hydraulic control system for an injection molding machine according to claim 4, characterized in that: The second pressure gauge (10) is connected to the back pressure valve (6) via the eighth oil passage (158).

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