Quick-change cylinder combination valve of foam plastic forming machine

Abstract

The utility model relates to a hydraulic control valve, in particular to a quick-change cylinder combination valve of a foam plastic forming machine. Comprising a valve body, a first valve group and a second valve group, the valve body is provided with a first oil outlet, a first working hole, a second working hole, a third working hole, a fourth working hole, a first connector, a second connector, a third connector, a fourth connector, a fifth connector, a sixth connector, a seventh connector and an eighth connector, wherein the first connector, the second connector, the third connector and the fourth connector are used for being connected with a first valve set, and the fifth connector, the sixth connector, the seventh connector and the eighth connector are used for being connected with a second valve set. The first connecting port is communicated with the first special-shaped oil duct, the second connecting port is communicated with the second oil inlet, the third connecting port is communicated with the fourth working hole, and the fourth connecting port is communicated with the third working hole; the fifth connecting port is communicated with the first working hole, the sixth connecting port is communicated with the first oil return channel through a first working oil channel, the seventh connecting port is communicated with the second working hole, and the fourth connecting port is communicated with the second oil inlet through a fourth special-shaped oil channel.

Description

Technical Field

[0001] The utility model relates to a hydraulic control valve, in particular to a quick-change cylinder combined valve for a foam plastic molding machine. Background Art

[0002] The molding die of a foam plastic molding machine is a key component essential for foam plastic molding production. Generally, it includes a fixed die and a movable die, and the two are buckled together to form a complete die. The opening and closing of the movable die are driven by a hydraulic system. For larger-sized dies, the existing die driving devices use hydraulic cylinders for driving to ensure the tightness between the movable die and the fixed die when the die is closed.

[0003] The control valve group of the existing foam plastic molding machine is too large in volume. The circuits between multiple mold stations are connected in series, and there are many pipeline connection points. The existing pipeline interfaces and pipeline connection directions of the valve group are not conducive to installation and adjustment, and the operation stability and safety are poor. There are also many defects in the opening and closing die valve group assembled by multiple general hydraulic components, such as many process oil channels, large pipeline pressure loss, cumbersome control circuits, high hydraulic power loss, high temperature during high-speed operation, and unsatisfactory heat dissipation control, etc. Summary of the Utility Model

[0004] Aiming at the deficiencies of the prior art, the utility model provides a quick-change cylinder combined valve for a foam plastic molding machine. By adopting this quick-change cylinder combined valve for a foam plastic molding machine, the complex and huge integrated block is omitted, not only greatly shortening the oil circuit, but also further reducing the manufacturing cost and rationalizing the installation position.

[0005] The utility model adopts the following technical scheme: A quick-change cylinder combined valve for a foam plastic molding machine includes a main valve body, a first valve group and a second valve group. The main valve body is communicated with a moving change cylinder and a fixed change cylinder through pipelines respectively. The first valve group and the second valve group are arranged above the main valve body. A first oil outlet is arranged at the bottom of the valve body, and the first oil outlet is communicated with a first oil return channel;

[0006] A third working surface is arranged on the right side of the valve body. A first working hole, a second working hole, a third working hole and a fourth working hole are arranged on the third working surface. When the system works, the first working hole is communicated with the rodless cavity of the fixed change cylinder, the second working hole is communicated with the rod cavity of the fixed change cylinder, the fourth working hole is communicated with the rodless cavity of the moving change cylinder, and the third working hole is communicated with the rod cavity of the moving change cylinder;

[0007] A first working surface and a second working surface are arranged at the rear side of the valve body. A first oil inlet is arranged on the first working surface and a second oil inlet is arranged on the second working surface;

[0008] The top of the valve body is provided with a mounting surface, on which there are a first connection port, a second connection port, a third connection port, and a fourth connection port for connecting the first valve group. The first connection port is communicated with the first special-shaped oil passage through the fourth special-shaped oil passage, and the first special-shaped oil passage is communicated with the first oil outlet. The second connection port is communicated with the second oil inlet. The third connection port is communicated with the fourth working hole, and the fourth connection port is communicated with the third working hole.

[0009] On the mounting surface, there are a fifth connection port, a sixth connection port, a seventh connection port, and an eighth connection port for connecting the second valve group. The fifth connection port is communicated with the first working hole. The sixth connection port is communicated with the first oil return passage through the sixth working oil passage. The seventh connection port is communicated with the second working hole. The fourth connection port is communicated with the second oil inlet through the fourth special-shaped oil passage.

[0010] In front of the valve body, there are an oil return port and a working oil output port. The oil return port is communicated with the sixth working oil passage and the first oil return passage respectively through the second oil return passage.

[0011] Furthermore, on the left side of the valve body, there is a first insertion surface, on which there is a first insertion hole, and a first overflow valve is arranged in the first insertion hole. The first overflow valve is provided with a first pilot oil inlet passage and a first pilot oil return passage.

[0012] On the right side of the valve body, there is also a fourth insertion surface, on which there is a fourth insertion hole, and a second one-way valve is arranged in the fourth insertion hole.

[0013] The first pilot oil return passage is communicated with the first special-shaped oil passage. The first special-shaped oil passage is connected or disconnected with the third working oil passage through the main spool of the first overflow valve. The third working oil passage is communicated with the third special-shaped oil passage through the second one-way valve. The first oil inlet is communicated with a first oil inlet passage. The first pilot oil inlet passage is communicated with the first oil inlet passage through a damping hole. The working oil output port is communicated with the first working oil passage. The third special-shaped oil passage is communicated with the first working oil passage.

[0014] Furthermore, on the left side of the valve body, there is a second insertion surface, on which there is a second insertion hole, and a second overflow valve is arranged in the second insertion hole. The second overflow valve is provided with a second pilot oil inlet passage and a second pilot oil return passage.

[0015] Above the third working surface, there is a protruding third insertion surface, on which there is a third insertion hole, and a first one-way valve is arranged in the third insertion hole.

[0016] The second pilot oil return passage is communicated with the first special-shaped oil passage. The first special-shaped oil passage is connected or disconnected with the second working oil passage through the main spool of the second overflow valve. The second oil inlet is communicated with a second oil inlet passage. The second working oil passage is communicated with the first one-way valve through the second oil inlet passage. The second pilot oil inlet passage is communicated with the second oil inlet passage through a damping hole.

[0017] Further, a second special-shaped oil passage is provided between the middle of the first one-way valve and the second one-way valve. The first overflow valve and the second overflow valve are connected through the first special-shaped oil passage. A fifth working hole is provided on the first working surface, and the fifth working hole is communicated with the working oil outlet.

[0018] Further, the first overflow valve and the second overflow valve are electromagnetic overflow valves.

[0019] Further, a first pressure measuring surface is further provided on the front of the valve body. A first pressure measuring hole is provided on the first pressure measuring surface. A second pressure measuring hole and a third pressure measuring hole are provided on the first working surface. A fourth pressure measuring hole is provided on the second working surface. The first pressure measuring hole is communicated with the fifth connection port. The fifth working hole and the third pressure measuring hole are communicated with the working oil outlet. The fourth pressure measuring hole is communicated with the fourth working hole.

[0020] The utility model has the following advantages:

[0021] Since the valve body is of a stacked valve structure, only the hydraulic control one-way valve, the pressure reducing valve and the electromagnetic reversing valve need to be sequentially installed above the valve body, which simplifies the installation form. The optimized casting cavity structure can form complex oil passages, the surface wall of the oil passage is smooth, the liquid flow damping coefficient is small, the structural strength is good, the seismic resistance is high, the noise is reduced, it is not easy to heat, energy-saving and environment-friendly. The external connecting oil pipelines of the optimized control device are integrated inside the casting, making the control device unit no longer messy. It reforms the opening and closing die control valve group of the foam molding machine and improves the opening and closing die speed of the mold. Description of the Drawings

[0022] Figure 1 is the structural schematic diagram of the utility model;

[0023] Figure 2 is the structural schematic diagram of the valve body in the utility model;

[0024] Figure 3 is the structural schematic diagram of the valve body from another angle in the utility model;

[0025] Figure 4 is the structural schematic diagram of the valve body from another angle in the utility model;

[0026] Figure 5 is the right view of the valve body in the utility model;

[0027] Figure 6 is Figure 5 the cross-sectional view at A in

[0028] Figure 7 is Figure 5 the cross-sectional view at B in

[0029] Figure 8 is Figure 5Cross-sectional view at C in the [figure];

[0030] Figure 9 Right view of the present utility model;

[0031] Figure 10 is Figure 9 Cross-sectional view at D in the [figure];

[0032] Figure 11 Left view of the present utility model;

[0033] Figure 12 is Figure 11 Cross-sectional view at E in the [figure];

[0034] Figure 13 is Figure 11 Cross-sectional view at F in the [figure];

[0035] Figure 14 is Figure 11 Cross-sectional view at G in the [figure];

[0036] Figure 15 Front view of the structure of the present utility model;

[0037] Figure 16 is Figure 15 Cross-sectional view at H in the [figure];

[0038] Figure 17 is Figure 15 Cross-sectional view at I in the [figure];

[0039] Figure 18 is Figure 15 Cross-sectional view at J in the [figure];

[0040] Figure 19 Schematic diagram of the present utility model.

[0041] In the figure: 1. Valve body;

[0042] 101. Oil return port; 102. Working oil output port; 103. First pressure measuring surface; 1031. First pressure measuring hole; 104. First oil outlet; 105. First working surface; 1051. First oil inlet; 1052. Second pressure measuring hole; 1053. Fifth working hole; 1054. Third pressure measuring hole; 106. Second working surface; 1061. Fourth pressure measuring hole; 1062. Second oil inlet; 108. First oil return channel; 109. First special-shaped oil channel; 111. Second special-shaped oil channel; 112. First working oil channel; 113. First oil inlet channel; 114. Third special-shaped oil channel; 115. Second oil return channel; 116. Second oil inlet channel.

[0043] 2. First overflow valve; 201. First cartridge mounting surface; 2011. First cartridge mounting hole; 202. First pilot oil return channel; 203. First pilot oil inlet channel.

[0044] 3. Second overflow valve; 301. Second cartridge mounting surface; 3011. Second cartridge hole; 302. Second pilot oil return passage; 303. Second pilot oil inlet passage;

[0045] 4. First check valve; 401. Third cartridge mounting surface; 4011. Third cartridge hole; 402. Third working surface; 4021. First working hole; 4022. Second working hole; 4023. Third working hole; 4024. Fourth working hole; 403. Second working oil passage; 404. Fourth special-shaped oil passage;

[0046] 5. Second check valve; 501. Fourth cartridge mounting surface; 5011. Fourth cartridge hole; 502. Third working oil passage;

[0047] 6. Shifting cylinder;

[0048] 7. Fixing and shifting cylinder;

[0049] 8. Mounting surface; 801. First connection port; 802. Second connection port; 803. Third connection port; 804. Fourth connection port; 805. Fifth connection port; 806. Sixth connection port; 8061. Sixth working oil passage; 807. Seventh connection port; 808. Eighth connection port. Detailed implementation mode

[0050] Embodiment:

[0051] As Figures 1 - 4 shown, a quick-change cylinder combination valve for a foam molding machine includes a main valve body 1, a first valve group and a second valve group. The first valve group and the second valve group are the same valve groups, and include a pilot-operated check valve, a pressure reducing valve, and an electromagnetic reversing valve stacked in sequence. As Figure 3 shown, a first oil outlet 104 is provided at the bottom of the valve body 1, and the first oil outlet 104 is communicated with a first oil return passage 108. As Figure 16 shown, an oil return port 101 and a working oil output port 102 are provided in front of the valve body 1, and the oil return port 101 is communicated with the sixth working oil passage 8061 and the first oil return passage 108 respectively through a second oil return passage 115.

[0052] As Figure 3 , Figure 4 , Figure 19As shown in the figure, a third working surface 402 is provided on the right side of the valve body 1. A first working hole 4021, a second working hole 4022, a third working hole 4023 and a fourth working hole 4024 are provided on the third working surface 402. The first working hole 4021 communicates with the rodless cavity of the fixed-exchange cylinder 7, the second working hole 4022 communicates with the rod cavity of the fixed-exchange cylinder 7, the fourth working hole 4024 communicates with the rodless cavity of the transfer-exchange cylinder 6, and the third working hole 4023 communicates with the rod cavity of the transfer-exchange cylinder 6; a first working surface 105 and a second working surface 106 are provided on the rear side of the valve body 1. A first oil inlet 1051, a second pressure measuring hole 1052 and a third pressure measuring hole 1054 are provided on the first working surface 105, and a fourth pressure measuring hole 1061 and a second oil inlet 1062 are provided on the second working surface 106.

[0053] As Figure 2 , Figure 5 , Figure 8 , Figure 15 , Figure 16 , Figure 18 As shown in the figure, an installation surface 8 is provided on the top of the valve body 1. A first connection port 801, a second connection port 802, a third connection port 803 and a fourth connection port 804 for connecting the first valve group are provided on the installation surface 8. The first connection port 801 communicates with the first special-shaped oil passage 109 through the fourth special-shaped oil passage 404, and the first special-shaped oil passage 109 communicates with the first oil outlet 104. The second connection port 802 communicates with the second oil inlet 1062; the third connection port 803 communicates with the fourth working hole 4024, and the fourth connection port 804 communicates with the third working hole 4023.

[0054] As Figure 2 , Figure 5 , Figure 6 , Figure 15 and Figure 16 As shown in the figure, a fifth connection port 805, a sixth connection port 806, a seventh connection port 807 and an eighth connection port 808 for connecting the second valve group are provided on the installation surface 8. The fifth connection port 805 communicates with the first working hole 4021, the sixth connection port 806 communicates with the first oil return passage 108 through the sixth working oil passage 8061, the seventh connection port 807 communicates with the second working hole 4022, and the eighth connection port 808 communicates with the second oil inlet 1062 through the fourth special-shaped oil passage 404.

[0055] As Figure 7 As shown in the figure, a first pressure measuring surface 103 is further provided on the front of the valve body 1. A first pressure measuring hole 1031 is provided on the first pressure measuring surface 103. The first pressure measuring hole 1031 communicates with the fifth connection port 805, and the fourth pressure measuring hole 1061 communicates with the third connection port 803.

[0056] As Figure 2 , Figure 11 andFigure 14 As shown, a first mounting surface 201 is provided on the left side of the valve body 1. A first mounting hole 2011 is formed on the first mounting surface 201, and a first overflow valve 2 is arranged in the first mounting hole 2011. The first overflow valve 2 is provided with a first pilot oil inlet passage 203 and a first pilot oil return passage 202.

[0057] As Figure 3 shown, Figure 9 a fourth mounting surface 501 is further provided on the right side of the valve body 1. A fourth mounting hole 5011 is formed on the fourth mounting surface 501, and a second one-way valve 5 is arranged in the fourth mounting hole 5011.

[0058] As Figure 14 shown, the first pilot oil return passage 202 is communicated with the first special-shaped oil passage 109. The first special-shaped oil passage 109 is communicated with the third working oil passage 502 through the main spool of the first overflow valve 2. The third working oil passage 502 is communicated with the third special-shaped oil passage 114 through the second one-way valve 5. The first oil inlet 1051 is communicated with a first oil inlet passage 113. The first pilot oil inlet passage 203 is communicated with the first oil inlet passage 113 through a damping hole. The working oil outlet 102 is communicated with a first working oil passage 112. The third special-shaped oil passage 114 is communicated with the first working oil passage 112.

[0059] As Figure 4 shown, Figure 11 a second mounting surface 301 is provided on the left side of the valve body 1. A second mounting hole 3011 is formed on the second mounting surface 301, and a second overflow valve 3 is arranged in the second mounting hole 3011. The second overflow valve 3 is provided with a second pilot oil inlet passage 303 and a second pilot oil return passage 302; Figure 14 shown,

[0060] As Figure 1 shown, Figure 3 a third mounting surface 401 protrudes above the third working surface 402. A third mounting hole 4011 is formed on the third mounting surface 401, and a first one-way valve 4 is arranged in the third mounting hole 4011; Figure 9 shown,

[0061] As Figure 13 shown, the second pilot oil return passage 302 is communicated with the first special-shaped oil passage 109. The first special-shaped oil passage 109 is communicated with the second working oil passage 403 through the main spool of the second overflow valve 3. The second oil inlet 1062 is communicated with a second oil inlet passage 116. The second working oil passage 403 is communicated with the first one-way valve 4 through the second oil inlet passage 116. The second pilot oil inlet passage 303 is communicated with the second oil inlet passage 116 through a damping hole.

[0062] As Figure 9 shown, Figure 10As shown, a second special-shaped oil passage 111 is provided between the middle of the first one-way valve 4 and the second one-way valve 5. The first overflow valve 2 and the second overflow valve 3 are connected through a first special-shaped oil passage 109. A fifth working hole 1053 is formed in the first working surface 105, and the fifth working hole 1053 is communicated with the working oil outlet 102.

[0063] As Figure 17 shown, the fifth working hole 1053 and the third pressure measuring hole 1054 are communicated with the working oil outlet 102.

[0064] Furthermore, the first overflow valve 2 and the second overflow valve 3 are electromagnetic overflow valves.

[0065] According to Figure 18 the principle shown, when the electromagnets on both solenoid valves are de-energized and both solenoid valves are in the middle position, the high-pressure oil from the two pumps entering from the first oil inlet 1051 and the second oil inlet 1062 respectively push open the second one-way valve 5 and the first one-way valve 4, and after merging, it is output from the working oil outlet 102 through the internal oil passage of the valve and enters the next valve group for work. At the same time, it can also be output through the fifth working hole 1053 to drive other actuators to work. The first overflow valve 2 and the second overflow valve 3 can realize the output and unloading of the high-pressure oil of the two pumps, so that the output high-pressure oil can realize single-pump oil supply or double-pump combined oil supply, thereby controlling the speed of the actuator and realizing energy saving at the same time.

[0066] When the displacement cylinder 6 and the fixed displacement cylinder 7 need to extend, the right electromagnet is energized. At this time, the electromagnetic reversing valve is in the right position. The hydraulic oil enters the first valve group and the second valve group through the second connection port 802 and the eighth connection port 808. After being decompressed by the pressure reducing valve, it pushes the pilot-operated check valve to open (the pilot-operated check valve can ensure that the oil cylinder does not slide down after stopping), and enters the third connection port 803 and the fifth connection port 805 respectively. Since the third connection port 803 is connected to the fourth working hole 4024, the fifth connection port 805 is connected to the first working hole 4021, the fourth working hole 4024 is connected to the rodless cavity of the displacement cylinder 6 through a pipeline, the first working hole 4021 is connected to the rodless cavity of the fixed displacement cylinder 7 through a pipeline, the second working hole 4022 is connected to the rod end cavity of the fixed displacement cylinder 7, and the third working hole 4023 is connected to the rod end cavity of the fixed displacement cylinder 7. After the hydraulic oil enters through the second connection port 802, it enters the rodless cavity of the displacement cylinder 6 through the first valve group and the fourth connection port 804. The oil inlet mode of the rodless cavity of the fixed displacement cylinder 7 is the same. The hydraulic oil enters the second valve group through the eighth connection port 808, and then enters the rodless cavity of the fixed displacement cylinder 7 through the fifth connection port 805. Push the piston rods of the displacement cylinder 6 and the fixed displacement cylinder 7 to extend to perform related work. The oil in the rodless cavity enters the first valve group and the second valve group through the third working hole 4023 and the second working hole 4022, and enters the first connection port 801 and the sixth connection port 806 through the pilot-operated check valve opened in the reverse direction. Since the first connection port 801 is connected to the first special-shaped oil passage 109, and the first special-shaped oil passage 109 is connected to the first oil outlet 104, the hydraulic oil enters the first oil outlet 104 through the first special-shaped oil passage 109. Since the sixth connection port 806 is connected to the second oil return passage 115, and the second oil return passage 115 is connected to the first oil outlet 104 through the first oil return passage 108, the hydraulic oil enters the first oil outlet 104 from the sixth connection port 806 through the second oil return passage 115 and the first oil return passage 108, and returns to the fuel tank through a pipeline.

[0067] When the displacement cylinder 6 and the fixation cylinder 7 need to retract, the left electromagnet is energized, the electromagnetic directional valve is in the left position, and the hydraulic oil enters the first valve group and the second valve group through the second connection port 802 and the eighth connection port 808. After being decompressed by the pressure reducing valve, it pushes the pilot-operated check valve to open (the pilot-operated check valve can ensure that the oil cylinder does not slide down after stopping), and enters the fourth connection port 804 and the seventh connection port 807 respectively. Since the fourth connection port 804 is communicated with the third working hole 4023 and the seventh connection port 807 is communicated with the second working hole 4022, according to the connection relationship of the oil cylinder interfaces described above, the hydraulic oil will enter the rod chambers of the displacement cylinder 6 and the fixation cylinder 7 through the pipeline at this time, pushing the piston rods of the displacement cylinder 6 and the fixation cylinder 7 to retract. The oil in the rodless chamber enters the first working hole 4021 and the fourth working hole 4024 through the pipeline, then enters the seventh connection port 807 and the third connection port 803, and then enters the first valve group and the second valve group. It enters the first connection port 801 and the sixth connection port 806 through the reversely opened pilot-operated check valve. Since the first connection port 801 is communicated with the first special-shaped oil passage 109 and the first special-shaped oil passage 109 is communicated with the first oil outlet 104, the hydraulic oil enters the first oil outlet 104 through the first special-shaped oil passage 109. Since the sixth connection port 806 is communicated with the second oil return passage 115 and the second oil return passage 115 is communicated with the first oil outlet 104 through the first oil return passage 108, the hydraulic oil enters the first oil outlet 104 from the sixth connection port 806 through the second oil return passage 115 and the first oil return passage 108, and returns to the fuel tank through the pipeline.

[0068] Among them, the first pressure measuring hole 1031 is used to detect the pressure at the first working hole 4021, that is, to detect the pressure in the rodless chamber of the fixation cylinder 7. The second pressure measuring hole 1052 is used to detect the pressure at the first oil inlet 1051. Since the first oil inlet 1051 is communicated with the third working oil passage 502, that is, to detect the pressure of the third working oil passage 502. The third pressure measuring hole 1054 is used to detect the pressure at the fifth working hole 1053, and the fourth pressure measuring hole 1061 is used to detect the pressure at the fourth working hole 4024, that is, the pressure in the rodless chamber of the displacement cylinder 6.

Claims

1. A quick-change cylinder combination valve for a foam molding machine, comprising a main valve body (1), a first valve group and a second valve group, the main valve body (1) being connected to a shift cylinder (6) and a fixed change cylinder (7) through pipelines, the first valve group and the second valve group being arranged above the main valve body (1), characterized in that: A first oil outlet (104) is provided at the bottom of the valve body (1), and the first oil outlet (104) is communicated with a first oil return passage (108); A third working surface (402) is provided on the right side of the valve body (1), and a first working hole (4021), a second working hole (4022), a third working hole (4023) and a fourth working hole (4024) are provided on the third working surface (402); when the system is working, the first working hole (4021) is communicated with the rodless cavity of the fixed-change cylinder (7), the second working hole (4022) is communicated with the rod cavity of the fixed-change cylinder (7), the fourth working hole (4024) is communicated with the rodless cavity of the shift cylinder (6), and the third working hole (4023) is communicated with the rod cavity of the shift cylinder (6); The rear side of the valve body (1) is provided with a first working surface (105) and a second working surface (106); the first working surface (105) is provided with a first oil inlet (1051) and the second working surface (106) is provided with a second oil inlet (1062); The top of the valve body (1) is provided with a mounting surface (8), and the mounting surface (8) is provided with a first connecting port (801), a second connecting port (802), a third connecting port (803), and a fourth connecting port (804) for connecting to the first valve group, the first connecting port (801) being in communication with the first special-shaped oil passage (109) via the fourth special-shaped oil passage (404), the first special-shaped oil passage (109) being in communication with the first oil outlet (104), the second connecting port (802) being in communication with the second oil inlet (1062); the third connecting port (803) being in communication with the fourth working hole (4024), and the fourth connecting port (804) being in communication with the third working hole (4023); The mounting surface (8) is provided with a fifth connection port (805), a sixth connection port (806), a seventh connection port (807), and an eighth connection port (808) for connecting to the second valve group; the fifth connection port (805) is in communication with the first working hole (4021); the sixth connection port (806) is in communication with the first oil return channel (108) via a sixth working oil channel (8061); the seventh connection port (807) is in communication with the second working hole (4022); and the fourth connection port (804) is in communication with the second oil inlet port (1062) via a fourth special-shaped oil channel (404); An oil return port (101) and a working oil output port (102) are provided in front of the valve body (1); the oil return port (101) is connected to the sixth working oil passage (8061) and the first oil return passage (108) respectively through the second oil return passage (115).

2. A quick-change cylinder combination valve for a foam molding machine according to claim 1, characterized in that: A first plug-in surface (201) is provided on the left side of the valve body (1), a first plug-in hole (2011) is provided on the first plug-in surface (201), a first overflow valve (2) is provided in the first plug-in hole (2011), and the first overflow valve (2) is provided with a first pilot oil inlet passage (203) and a first pilot oil return passage (202); A fourth plug-in surface (501) is further provided on the right side of the valve body (1), a fourth plug-in hole (5011) is provided on the fourth plug-in surface (501), and a second one-way valve (5) is provided in the fourth plug-in hole (5011); The first pilot oil return passage (202) is connected to the first special-shaped oil passage (109); the first special-shaped oil passage (109) is connected and disconnected with the third working oil passage (502) via the main valve core of the first overflow valve (2); the third working oil passage (502) is connected to the third special-shaped oil passage (114) via the second one-way valve (5); the first oil inlet (1051) is connected to the first oil inlet passage (113); the first pilot oil inlet passage (203) is connected to the first oil inlet passage (113) via a damping hole; the working oil output port (102) is connected to the first working oil passage (112); and the third special-shaped oil passage (114) is connected to the first working oil passage (112).

3. A quick-change cylinder combination valve for a foam molding machine according to claim 2, characterized in that: A second plug-in surface (301) is provided on the left side of the valve body (1), a second plug-in hole (3011) is provided on the second plug-in surface (301), a second relief valve (3) is provided in the second plug-in hole (3011), and the second relief valve (3) is provided with a second pilot oil inlet passage (303) and a second pilot oil return passage (302); A third plug-in surface (401) is protrudingly provided above the third working surface (402), a third plug-in hole (4011) is provided on the third plug-in surface (401), and a first one-way valve (4) is provided in the third plug-in hole (4011); The second pilot oil return passage (302) is in communication with the first special-shaped oil passage (109); the first special-shaped oil passage (109) is connected and disconnected with the second working oil passage (403) via the main valve core of the second overflow valve (3); the second oil inlet (1062) is in communication with the second oil inlet passage (116); the second working oil passage (403) is in communication with the first non-return valve (4) via the second oil inlet passage (116); and the second pilot oil inlet passage (303) is in communication with the second oil inlet passage (116) via the damping hole.

4. A quick-change cylinder combination valve for a foam molding machine according to claim 3, characterized in that: A second special-shaped oil passage (111) is provided between the middle of the first one-way valve (4) and the second one-way valve (5); the first overflow valve (2) and the second overflow valve (3) are connected via the first special-shaped oil passage (109); a fifth working hole (1053) is provided on the first working surface (105); the fifth working hole (1053) is connected to the working oil outlet (102).

5. The quick-change cylinder combination valve for a foam molding machine according to claim 2, characterized in that: The first overflow valve (2) and the second overflow valve (3) are electromagnetic overflow valves.

6. A quick-change cylinder combination valve for a foam molding machine according to claim 4, characterized in that: The front side of the valve body (1) is also provided with a first pressure measuring surface (103), the first pressure measuring surface (103) is provided with a first pressure measuring hole (1031), the first working surface (105) is provided with a second pressure measuring hole (1052) and a third pressure measuring hole (1054), the second working surface (106) is provided with a fourth pressure measuring hole (1061), the first pressure measuring hole (1031) is connected to the fifth connecting port (805), the fifth working hole (1053) and the third pressure measuring hole (1054) are connected to the working oil output port (102), and the fourth pressure measuring hole (1061) is connected to the fourth working hole (4024).

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