Compression oil cylinder control combination valve of filter press

Abstract

The invention discloses a filter press compression oil cylinder control combination valve which comprises a main valve body, a main valve element is arranged in the main valve body, the main valve body is provided with an electro-hydraulic pilot valve, the main valve body is provided with a port P, a port T and an external working oil port, and a left T cavity, a left working cavity, a middle pressure cavity, a right working cavity and a right T cavity are formed in a core hole of the main valve body and communicated with the core hole. A communicating cavity communicated with a left T cavity and a right T cavity is formed in the main valve body, a middle pressure cavity is communicated with a P opening, the communicating cavity is communicated with a T opening, a left working cavity and a right working cavity are connected with an external working oil opening, and the external working oil opening is connected with a rodless cavity and a rod cavity of a mold closing cylinder. An oil port of the main valve body is arranged in a three-point mode, the outer edge of a T port extends to be provided with an installation hole, field installation is convenient, a control loop of a die assembly cylinder is optimized through the combination valve, and the hydraulic control efficiency is greatly improved.

Description

Technical Field

[0001] The invention belongs to the field of automatic function modules of hydraulic systems of filter presses, in particular to a filter press compression cylinder control combined valve. Background Art

[0002] Filter press is a common solid-liquid separation equipment, widely used in chemical industry, pharmaceutical industry, metallurgy, mineral processing, food, environmental protection and other fields. The working principle of filter press is mainly to generate high-pressure oil through the hydraulic system to push the cylinder to work. However, the hydraulic control circuit of the existing filter press hydraulic drive system is relatively complex and has high control requirements. It is composed of multiple plate valves, cartridge valves, and valve blocks, and the components are loose. Secondly, the actions of various cylinders are connected and controlled through various joints and pipelines. The oil circuit is complex. Under the premise of achieving the control requirements, the valve group is huge, and the channel resistance and pressure loss are high. The equipment lacks flexibility and compactness during installation, which greatly reduces the efficiency of use and production. Summary of the invention

[0003] In order to reduce the cost, reduce the overall weight of the valve block, and improve the flexibility and compactness of the valve group in equipment installation, the present invention provides a filter press compression cylinder control combination valve, comprising: A filter press compression cylinder control combination valve, including a core hole arranged in a main valve body, a main valve core adapted to be arranged in the core hole, an electro-hydraulic pilot valve connected to control the axial movement reversal of the main valve core is arranged in the main valve body, a P port, a T port and an external working oil port are arranged in the main valve body, a left T chamber, a left working chamber, a middle pressure chamber, a right working chamber and a right T chamber are cast along the core hole of the main valve body, the above-mentioned cavities are respectively connected to the core hole, a connecting chamber is arranged in the main valve body, the connecting chamber is connected to the left T chamber and the right T chamber, the middle pressure chamber is connected to the P port, the connecting chamber is connected to the T port, the left working chamber and the right working chamber are connected to the external working oil port, and the external The working oil port is respectively connected to the rodless chamber and the rod chamber of the mold clamping cylinder, and also includes a hydraulically controlled one-way valve. A hydraulically controlled one-way valve is inserted in the main valve body. The main valve body is provided with a first connecting plate surface, a second connecting plate surface and a third connecting plate surface. K1P holes, K1T holes, K1A holes and K1B holes are provided on the upper part of the first connecting plate surface, a hydraulically controlled one-way valve insertion hole is provided at the lower part, an overflow valve first insertion hole is provided on the second connecting plate surface, the upper half of the third connecting plate surface is the main valve body core hole, and the lower half is provided with an overflow valve second insertion hole, and an electromagnetic ball valve insertion hole is provided on the T-port side adjacent to the valve core hole of the main valve body.

[0004] Furthermore, the electro-hydraulic pilot valve is arranged on the first connecting plate surface, the overflow valve 1 is inserted into the overflow valve 1 insertion hole on the second connecting plate surface, and the overflow valve 2 is inserted into the overflow valve 2 insertion hole on the third connecting plate surface. The main valve core is located in the core hole and forms a three-position four-way structure with a differential function with the left T chamber, the left working chamber, the middle pressure chamber, the right working chamber, and the right T chamber, wherein the middle position is the O function and the right position is the Y function.

[0005] Furthermore, the main valve body is provided with main oil ports: P port, T port, A port, and B port. The main oil ports are distributed in three points. The T port is on the side of the P port, and the A port and the B port are arranged below the P port. The A port is arranged adjacent to the B port. A hydraulically controlled one-way valve is inserted in the hydraulically controlled one-way valve insertion hole below the first connecting plate surface, and the hydraulically controlled one-way valve runs through the A port.

[0006] Furthermore, it also includes an electromagnetic ball valve, which is a two-position two-way valve with a one-way closing function. An installation socket of the valve is arranged on one side of the T port for inserting the valve. When the electromagnet of the electromagnetic ball valve is energized, the A port is unidirectionally connected to the T port. A casting hole, an annular oil chamber, an annular chamber and a hydraulically controlled one-way valve outlet chamber are arranged in the main valve body. One port of the electromagnetic ball valve is connected to the T port through the annular chamber via the casting hole, and the annular chamber is connected to the hydraulically controlled one-way valve outlet chamber and the annular oil chamber in turn.

[0007] Furthermore, the hydraulically controlled one-way valve includes a control end and a one-way valve, the control end includes a control piston chamber and a control piston for pushing the one-way valve to open and close, an inlet chamber is arranged in the front area of ​​the one-way valve, and a hydraulically controlled one-way valve outlet chamber is arranged in the rear area of ​​the one-way valve, a process hole one is arranged in the control chamber, and a process hole two is arranged behind the oil return chamber, the control piston divides the control piston chamber into a control chamber opening side and a control chamber oil return side, and a cover plate is arranged at the control piston chamber opening.

[0008] Furthermore, the first connection panel is provided with a K1P hole, a K1T hole, a K1A hole, and a K1B hole, wherein the K1P hole is connected to the medium pressure chamber, the K1T hole is connected to the T port, and the K1B hole and the K1A hole are respectively connected to the spring chambers at both ends of the main valve core.

[0009] Furthermore, the main valve body is provided with outer edges extending in multiple directions on the outer periphery of the T-port, and mounting through holes are respectively provided on the outer edges.

[0010] Compared with the prior art, the following beneficial effects can be obtained: the filter press compression cylinder control combination valve integrates multiple functional valves such as electro-hydraulic reversing valve, hydraulically controlled non-return valve, relief valve, electromagnetic ball valve, etc. into a combination valve body, the main oil port has a three-point stable layout, and the first connecting plate surface, the second connecting plate surface, and the third connecting plate surface are set, which optimizes the spatial layout of the electro-hydraulic reversing valve, the relief valve, the electromagnetic ball valve, and the hydraulically controlled non-return valve. Under the premise of a more compact layout and reduced space, the oil channel utilization rate within the unit volume of the main valve body is high, the center of gravity of the main valve body is stable, the valve body has no concentrated stress points, and the outer surface casting structure is conducive to mold opening, demolding and molding in large-scale manufacturing. The pressure oil channel and the return oil channel in the main valve body are adjacent and cross-distributed, which can improve heat conduction and prevent local high temperature. The main valve body oil port setting direction and position are friendly, the bottom of the main valve body is reliably fixed, and it is easy to install on site, and the control circuit of the mold clamping cylinder is optimized. The highly integrated main valve body reduces the cost and greatly improves the efficiency of hydraulic control. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is the overall principle diagram of the present invention; Figure 3 It is a schematic diagram of the forward structure of the main valve body of the present invention; Figure 4 yes Figure 3 A schematic diagram of the structure from another angle; Figure 5 is a top view of the main valve body of the present invention; Figure 6 yes Figure 5 Schematic diagram of HH section; Figure 7 yes Figure 5 Schematic diagram of the GG cross section; Figure 8 It is the overall structural front view of the present invention; Fig. 9 yes Figure 8 FF cross-sectional diagram; Fig.10 It is a bottom view of the overall structure of the present invention; Fig.11 yes Fig.10 KK cross-sectional diagram; Fig.12 yes Fig.10 Schematic diagram of CC cross section; Fig.13 yes Fig.10 DD cross-sectional diagram; Fig.14 The overall structure of the present invention is shown in the right side view; Fig.15 yes Fig.14 Schematic diagram of EE cross section.

[0012] in: 1-main valve body, 101-left spring chamber, 102-left T chamber, 103-left working chamber, 104-medium pressure chamber, 105-right working chamber, 106-right T chamber, 107-right spring chamber, 108-connecting chamber, 109-left pilot control chamber hole, 110-right pilot control chamber hole, 111-first connecting plate surface, 112-second connecting plate surface, 113-third connecting plate surface, 114-process hole 1, 115-process hole 2, 116-casting hole, 117-ring chamber, 118-chamber 1, 119-hydraulic control one-way valve outlet chamber, 120-annular oil chamber, 2-Electro-hydraulic pilot valve, 3-valve cover, 4- Relief valve 1, 41- Relief valve 1 installation hole, 5- overflow valve 2, 51- overflow valve 2 mounting hole, 6- electromagnetic ball valve, 61- electromagnetic ball valve installation hole, 7-hydraulic control check valve, 71-hydraulic control check valve installation hole, 8-Mold clamping cylinder. DETAILED DESCRIPTION

[0013] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0014] like Figure 1-15 A filter press compression cylinder control combination valve comprises: a main valve body 1, an electro-hydraulic pilot valve 2, a valve cover 3, a relief valve 1 4, a relief valve 2 5, an electromagnetic ball valve 6 and a hydraulically controlled one-way valve 7.

[0015] like Figure 3 , Figure 4 As shown, the main valve body 1 is provided with a first connecting plate surface 111 on the front side, which complies with the ISO4401 international standard, a second connecting plate surface 112 is provided on the upper right side, and a third connecting plate surface 113 is provided below the second connecting plate surface 112. The main valve body 1 is provided with a P port, a T port, an A port, and a B port, and the P port is located at the top of the valve body. Port A is adjacent to port B and is located at the bottom of the valve body corresponding to port P. Port T is arranged on the side of the main valve body between port P and ports A and B. K1P hole, K1T hole, K1A hole and K1B hole are arranged on the upper part of the first connecting plate surface 111. A hydraulically controlled one-way valve insertion hole 71 is arranged below the first connecting plate surface 111. An overflow valve first insertion hole 41 is arranged on the second connecting plate surface 112. The upper half of the third connecting plate surface 113 is the core hole of the main valve body 1, and the lower half is provided with an overflow valve second insertion hole 51. An electromagnetic ball valve insertion hole 61 is arranged on the side of the T port adjacent to the valve core hole of the main valve body 1, and outer edges are extended in multiple directions on the periphery of the T port, and mounting through holes are respectively arranged at the outer edges.

[0016] like Figure 1 , Fig. 9As shown, a core hole that passes through the left and right sides is provided in the main valve body 1, and a main valve core is adapted to be provided in the core hole. A left spring chamber 101 and a right spring chamber 107 for accommodating a spring are provided at both ends of the main valve core. Valve covers 3 are provided on the left and right end faces of the core hole of the main valve body 1, respectively. The valve covers 3 buckle the spring, and the left and right springs center the main valve core. The left spring chamber 101 and the right spring chamber 107 are connected to the left pilot control chamber hole 109 and the right pilot control chamber hole 110 respectively; a left T chamber 102, a left working chamber 103, a middle pressure chamber 104, a right working chamber 105, and a right T chamber are cast in the core hole of the main valve body 1. 106, the above-mentioned holes are connected to the core holes respectively, and a connecting cavity 108 is set in the main valve body 1, and the connecting cavity 108 connects the left T cavity 102 and the T port, the middle pressure cavity 104 connects the P port, the left working cavity 103 connects the inlet cavity of the hydraulic control check valve 7, and the outlet cavity of the hydraulic control check valve 7 connects the A port. The main valve core is located in the core hole and forms a three-position four-way structure with a differential function with the left T cavity 102, the left working cavity 103, the middle pressure cavity 104, the right working cavity 105, and the right T cavity 106, wherein the middle position is the O function, and the right position is the Y function, which is used to realize the differential function. The first connecting plate surface 111, the second connecting plate surface 112, and the third connecting plate surface 113 are respectively connected with the electro-hydraulic pilot valve 2, the overflow valve 1 4, and the overflow valve 2 5, which are all electromagnetic valves. The electro-hydraulic pilot valve 2 is a three-position four-way valve, and the middle position is the Y function.

[0017] like Fig.11 , Fig.15 As shown, the hydraulically controlled one-way valve 7 is installed from the hydraulically controlled one-way valve insertion hole 71 above the A port. The hydraulically controlled one-way valve 7 includes a control end and a one-way valve. The control end includes a control piston chamber and a control piston for pushing the one-way valve to open and close. An inlet chamber is arranged in the front area of ​​the one-way valve to communicate with the left working chamber 103 of the main valve core. An outlet chamber is arranged in the rear area of ​​the one-way valve to communicate with the A port. The control piston chamber is divided into a control chamber and an oil return chamber by a piston. A process hole 2 115 is arranged in the control chamber to communicate with the B port. A process hole 114 is arranged behind the oil return chamber to communicate with the left T chamber 102. A cover plate is arranged at the control piston chamber.

[0018] like Figure 3 , Fig. 9 , Fig.13 As shown, the first connecting plate 111 is provided with a K1P hole, a K1T hole, a K1A hole, and a K1B hole, wherein the K1P hole is connected to the medium pressure chamber 104 , the K1T hole is connected to the T port, the K1A hole is connected to the left pilot control chamber hole 109 , and the K1B hole is connected to the right pilot control chamber hole 110 .

[0019] like Figure 6 , Figure 7 , Fig. 9As shown, the bottom hole inside the relief valve 1 insertion hole 41 is connected to the P port, and the side hole is connected to the T port. The bottom hole inside the relief valve 2 insertion hole 51 is connected to the B port, and the side hole is connected to the T port. The side holes of the relief valve 14 and relief valve 25 insertion holes are connected to the T port to form a cavity 118, and the cavity 118 is also connected to the right T cavity 106.

[0020] like Figure 2 , Fig. 9 , Fig.10 , Fig.11 As shown, the electromagnetic ball valve 6 is laterally inserted into the insertion hole 61. The electromagnetic ball valve 6 is a two-position two-way valve with a one-way closing function. When the electromagnet is energized, port A is unidirectionally connected to port T. A casting hole 116 and an annular oil chamber 120 are provided in the main valve body 1. An annular chamber 117 is provided in the insertion hole of the electromagnetic ball valve 6. One end of the electromagnetic ball valve 6 is connected to port T through the casting hole 116, and the other end is connected to the annular chamber 117. The annular chamber 117 is connected to the hydraulic control one-way valve outlet chamber 119 and the annular oil chamber 120 in sequence.

[0021] like Figure 1-15 As shown, when pressure oil is supplied to the P port, the pressure oil enters the middle pressure chamber 104, the K1P hole, the left T chamber 102, the right T chamber 106, the connecting chamber 108, and the K1T hole to the T port. When the clamping cylinder 8 needs to be extended, the electromagnet YV2 of the electro-hydraulic pilot valve 2 is energized, the K1P is connected to the K1B hole, the K1A hole is connected to the K1T hole, and the pressure control oil enters the middle pressure chamber 104 from the P port, and then enters the K1B hole, the transition hole, the left pilot control chamber hole 109 to the spring chamber in sequence through the K1P hole, as shown in FIG. Fig. 9 , pushing the main valve core to move right, the middle pressure chamber 104 is connected to the left working chamber 103 and the right working chamber 105 through the main valve core step; the main pressure oil enters the middle pressure chamber 104 and the right working chamber 105 from the P port, pushes open the hydraulic control one-way valve 6 to the A port, supplies oil to the rodless chamber of the mold clamping cylinder 8, pushes the mold clamping cylinder to extend, and the return oil of the rod chamber returns to the right working chamber 105 through the B port. At this time, the three oil chambers of the left working chamber 103, the middle pressure chamber 104, and the right working chamber 105 are connected, the return oil of the rod chamber will merge with the oil entering from the P port into the middle pressure chamber 104, and together push the piston rod to extend quickly, thereby realizing differential control.

[0022] When the clamping cylinder 8 fast moves to the set position, the solenoid YV2 of the electro-hydraulic pilot valve 2 loses power, the main valve core returns to the middle position, and the main valve stops supplying oil to the clamping cylinder; at this time, the solenoid YV3 is energized, the solenoid ball valve 6 opens, and the high-pressure oil in the rodless cavity of the clamping cylinder 8 passes through the A port and enters the annular cavity 117 of the solenoid ball valve 6, and then enters the T port through the opened solenoid ball valve 6, releasing the high pressure in the rodless cavity.

[0023] When the mold clamping cylinder needs to retract, the electro-hydraulic pilot valve YV2 is energized, the K1P hole is connected to the K1A hole, the K1B hole is connected to the K1T hole, and the pressure control oil enters the K1A hole in turn, and the right pilot control cavity hole 110 to the spring cavity, such as Fig. 9 , driving the main valve core to move left, the middle pressure chamber 104 is connected to the right working chamber 105, the left working chamber 103 is connected to the left T chamber 102, the pressure oil enters the middle pressure chamber 104 from the P port, the right working chamber 105 is supplied to the rod chamber of the mold clamping cylinder 8 from the B port, pushing the mold clamping cylinder to retract, the B port pushes the rear area control chamber of the hydraulic control check valve 7 to open through the process hole 115, while the oil return chamber of the rear area of ​​the hydraulic control check valve 7 leaks oil to the left T chamber 102 through the process hole 114, at this time, the oil in the rodless chamber of the mold clamping cylinder leaks oil from the A port through the opened hydraulic control check valve 7 and the bottom annular oil chamber 120 into the left working chamber 103, and then returns to the T port through the left T chamber 102. In this process, the overflow valve 25 acts as a safety valve.

[0024] In this whole process, the relief valve 4 plays the role of a safety valve.

[0025] Through the above actions, a working cycle of differential rapid extension, pressure holding, pressure release and retraction of the mold clamping cylinder 8 is realized.

Claims

1. A filter press compression cylinder control combination valve, comprising a main valve body (1) having a core hole arranged therein, a main valve core being adapted to be arranged therein, the main valve body (1) being provided with an electro-hydraulic pilot valve (2) connected to control the axial movement reversal of the main valve core, the main valve body (1) being provided with a P port, a T port and an external working oil port, and a left T chamber (102), a left working chamber (103), a middle pressure chamber (104) and a right working chamber (105) being cast along the core hole of the main valve body (1) , right T chamber (106), the above-mentioned cavities are connected to the core holes respectively, a connecting chamber (108) is arranged in the main valve body (1), the connecting chamber (108) is connected to the left T chamber (102) and the right T chamber (106), the middle pressure chamber (104) is connected to the P port, the connecting chamber (108) is connected to the T port, the left working chamber (103) and the right working chamber (105) are connected to the external working oil port, and the external working oil port is respectively connected to the rodless chamber and the rod chamber of the mold clamping cylinder, characterized in that: It also includes a hydraulically controlled non-return valve (7), wherein the hydraulically controlled non-return valve (7) is inserted in the main valve body (1), and a first connecting plate surface (111), a second connecting plate surface (112), and a third connecting plate surface (113) are provided on the main valve body (1); a K1P hole, a K1T hole, a K1A hole, and a K1B hole are provided on the upper part of the first connecting plate surface (111), and a hydraulically controlled non-return valve insertion hole (71) is provided at the lower part; a relief valve first insertion hole (41) is provided on the second connecting plate surface (112); the upper half of the third connecting plate surface (113) is a core hole of the main valve body (1), and the lower half is provided with a relief valve second insertion hole (51); and an electromagnetic ball valve insertion hole (61) is provided on the side of the T port adjacent to the valve core hole of the main valve body (1).

2. A filter press compression cylinder control combination valve as claimed in claim 1, characterized in that: The electro-hydraulic pilot valve (2) is arranged on the first connecting plate surface (111), the overflow valve 1 (4) is inserted into the overflow valve 1 insertion hole (41) on the second connecting plate surface (112), and the overflow valve 2 (5) is inserted into the overflow valve 2 insertion hole (51) on the third connecting plate surface (113). The main valve core is located in the core hole and forms a three-position four-way structure with a differential function with the left T chamber (102), the left working chamber (103), the middle pressure chamber (104), the right working chamber (105), and the right T chamber (106), wherein the middle position is an O function and the right position is a Y function.

3. A filter press compression cylinder control combination valve as claimed in claim 2, characterized in that: The main valve body (1) is provided with main oil ports: a P port, a T port, an A port, and a B port. The T port is located at the side of the P port. The A port and the B port are provided below the P port. The A port and the B port are provided adjacent to each other. A hydraulically controlled one-way valve (7) is inserted in a hydraulically controlled one-way valve insertion hole (71) below the first connecting plate surface (111). The hydraulically controlled one-way valve (7) passes through the A port.

4. A filter press compression cylinder control combination valve as claimed in claim 3, characterized in that: The electromagnetic ball valve (6) is also included. The electromagnetic ball valve (6) is a two-position two-way valve with a one-way sealing function. A solenoid ball valve mounting hole (61) is provided on one side of the T port for inserting the electromagnetic ball valve (6). When the electromagnetic ball valve (6) is energized, the A port is unidirectionally connected to the T port. A casting hole (116), an annular oil chamber (120), an annular chamber (117) and a hydraulically controlled one-way valve outlet chamber (119) are provided in the main valve body. After the electromagnetic ball valve (6) is energized, one port is connected to the T port through the annular chamber (117) and the casting hole (116). The annular chamber (117) is connected to the hydraulically controlled one-way valve outlet chamber (119) and the annular oil chamber (120) in sequence.

5. A filter press compression cylinder control combined valve as claimed in claim 4, characterized in that: The hydraulically controlled non-return valve (7) comprises a control end and a non-return valve, wherein the control end comprises a control piston chamber and a control piston for pushing the non-return valve to open and close, an inlet chamber is arranged in the front area of ​​the non-return valve, a hydraulically controlled non-return valve outlet chamber (119) is arranged in the rear area of ​​the non-return valve, a process hole 1 (114) is arranged in the control chamber, and a process hole 2 (115) is arranged behind the oil return chamber, the control piston divides the control piston chamber into a control chamber opening side and a control chamber oil return side, and a cover plate is arranged at the control piston chamber opening.

6. A filter press compression cylinder control combined valve as claimed in claim 2, characterized in that: The first connection panel (111) is provided with a K1P hole, a K1T hole, a K1A hole, and a K1B hole, wherein the K1P hole is connected to the medium pressure chamber (104), the K1T hole is connected to the T port, and the K1B hole and the K1A hole are respectively connected to the spring chambers at both ends of the main valve core.

7. A filter press compression cylinder control combination valve as claimed in claim 1, characterized in that; The main valve body (1) is provided with outer edges extending in multiple directions on the outer periphery of the T-port, and mounting through holes are respectively provided on the outer edges.

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