A multi-purpose punching cylinder with high and low pressure matching and a punching method

Abstract

The present invention relates to the field of hydraulics, and more particularly to a multi-purpose punching cylinder and punching method with high and low pressure matching. The punching cylinder (10) comprises a cylinder body (113), the cylinder body (113) is cylindrical, the cylinder body (113) is fixed to a fixed cylinder (115) by a fixing bolt (114), the fixed cylinder (115) comprises an oil inlet 1 (111), the lower part of the oil inlet 1 (111) can squeeze a piston from a first action surface (118), the fixed cylinder (115) can fit the groove position of the piston, the cylinder body (113) comprises an oil inlet 2 (112), the oil inlet 2 (112) leads to the annular surface (117) of the piston being squeezed. The application of the high and low pressure switching valve of this patent invention; secondly, the application of the differential circuit in the oil circuit; and finally, the application of multiple return oil pipelines to reduce the return oil resistance.

Description

Technical Field

[0001] The invention relates to the field of hydraulic pressure, and in particular to a multi-purpose punching cylinder with high and low pressure matching and a punching method. Background Art

[0002] The processing of longitudinal beams for automobile chassis mainly relies on the hydraulic three-sided punching machine for automobile longitudinal beams to achieve three-sided punching of the belly and wing surfaces of the channel steel. Each longitudinal beam is 12 meters long and has a total of 350 holes to be punched, so improving efficiency becomes particularly important. Summary of the invention

[0003] Purpose of the invention: To provide a multi-purpose punching cylinder and punching method with better high and low pressure matching. The specific purpose can be seen in the multiple substantial technical effects of the specific implementation part.

[0004] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0005] Solution 1:

[0006] A multi-purpose punching cylinder with high and low pressure matching, characterized in that the punching cylinder 10 includes a cylinder body 113, the cylinder body 113 is cylindrical, the cylinder body 113 is fixed to a fixed cylinder 115 by a fixing bolt 114, the fixed cylinder 115 includes an oil inlet 111, the piston can be squeezed from a first acting surface 118 below the oil inlet 111, the fixed cylinder 115 can fit into the groove position of the extruded piston, the cylinder body 113 includes an oil inlet 2 112, the oil inlet 2 112 leads to the annular surface 117 of the piston extruded.

[0007] A further technical solution of the present invention is that a piston sleeve 116 is fixed below the cylinder body 113 by a fixing bolt 114 , and the extrusion piston can move from the piston in the piston sleeve 116 .

[0008] A further technical solution of the present invention is that a gap is included between the lower part of the extrusion piston and the inner wall of the cylinder body 113 , and the cylinder body 113 includes an oil return port 119 , which points to the gap.

[0009] A further technical solution of the present invention is that the gap is formed by the piston sleeve 116 , the piston, and the cylinder body 113 .

[0010] A further technical solution of the present invention is that the double pump extends out with two oil circuits, which are respectively a high-pressure oil pipe Ph and a low-pressure oil pipe PL; the high-pressure oil pipe Ph is connected to the solenoid valve 3 and the cartridge valve 5 and then connected to the punching cylinder 10, and the high-pressure oil pipe Ph is also connected to the pressure switching valve 7 and the punching main valve 8; the low-pressure oil pipe PL is connected to the one-way valve 1 and then connected to the pressure switching valve 7, the punching main valve 8 is connected to the punching cylinder 10, and the cartridge valve 2 6 is also connected to the return pipe 1 T1, the return pipe 2 T2, the return pipe 3 T3, and the return pipe 4 T4; the return pipe 1 T1, the return pipe 2 T2, the return pipe 3 T3, and the return pipe 4 T4 are connected to the oil suction pipe 14.

[0011] Option 2:

[0012] A hydraulic valve oil circuit that automatically switches between high and low pressures, characterized in that a double pump extends out with two oil circuits, the two oil circuits are respectively a high-pressure oil pipe Ph and a low-pressure oil pipe PL; the high-pressure oil pipe Ph is connected to a solenoid valve 3 and a cartridge valve 5, and then connected to a punching cylinder 10, and the high-pressure oil pipe Ph is also connected to a pressure switching valve 7 and a punching main valve 8; the low-pressure oil pipe PL is connected to a one-way valve 1, and then connected to the pressure switching valve 7, the punching main valve 8 is connected to the punching cylinder 10, and the cartridge valve 2 6 is also connected to a return pipe 1 T1, a return pipe 2 T2, a return pipe 3 T3, and a return pipe 4 T4; the return pipe 1 T1, the return pipe 2 T2, the return pipe 3 T3, and the return pipe 4 T4 are connected to an oil suction pipe 14.

[0013] A further technical solution of the present invention is that the high-pressure oil pipe Ph is connected to the high-pressure accumulator 2-1.

[0014] A further technical solution of the present invention is that the low-pressure oil pipe PL is connected to the low-pressure accumulator 2-2.

[0015] A further technical solution of the present invention is that the punching main valve 8 is communicatively connected to the electro-hydraulic pilot valve 9 .

[0016] A further technical solution of the present invention is that the one-way valve 1, the high-pressure accumulator 2-1, the low-pressure accumulator 2-2, the solenoid valve 1 3, the solenoid valve 2 4, and the cartridge valve 1 5 and the cartridge valve 2 6 are installed on a valve plate.

[0017] The present invention adopting the above technical solution has the following beneficial effects compared with the prior art: compared with the ordinary hydraulic transmission circuit, the main advantage of this circuit is that the punching frequency is high and the punching force is large, so the production efficiency is high. First, the application of the high and low pressure switching valve of this patent invention; second, the application of the differential circuit in the oil circuit; and finally, the application of multiple return oil pipelines to reduce the return oil resistance. As shown in the schematic diagram, the power is provided by the high and low pressure dual oil circuits. The low-pressure oil is directly connected to the accumulator and enters the lower chamber of the main punch cylinder. During the empty stroke, the solenoid valve at one end of the electro-hydraulic valve is energized, and the low-pressure oil enters the upper chamber of the cylinder through the P port of the electro-hydraulic valve. A differential circuit is formed, allowing the cylinder to quickly approach the workpiece; when the workpiece is contacted, the one-way valve reverses to cut off the low-pressure channel, and the system pressure increases to punch the workpiece. The high and low pressures are automatically switched as the load changes. As the load increases, the system automatically cancels the differential circuit, and a large punching force can be obtained at this time. The lower chamber of the oil cylinder is directly connected to the low pressure and connected to the accumulator. The accumulator is used for rapid return of the system, rapid oil replenishment to the upper chamber of the oil cylinder when punching the differential circuit, and buffering during the downward movement of the oil cylinder to prevent the piston from hitting the bottom of the cylinder and reduce the failure rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to further illustrate the present invention, the following is further described in conjunction with the accompanying drawings:

[0019] Figure 1 It is the schematic diagram of the invention;

[0020] Figure 2 It is a structural schematic diagram of a double pump;

[0021] Figure 3 This is one of the schematic diagrams of the installation structure of high and low pressure valves;

[0022] Figure 4 This is the second schematic diagram of the high and low pressure valve installation structure;

[0023] Figure 5 It is a schematic diagram of the internal structure of the punching cylinder;

[0024] Figure 6 It is a schematic diagram of the external structure of the punching cylinder;

[0025] 1. One-way valve; 2. Accumulator; 2-1. High-pressure accumulator; 2-2. Low-pressure accumulator; 3. Solenoid valve 1; 4. Solenoid valve 2; 5. Cartridge valve 1; 6. Cartridge valve 2; 7. Pressure switching valve; 8. Punching main valve; 9. Electro-hydraulic pilot valve; 10. Punching cylinder; 11. Integral piston; T1 return pipe 1; T2 return pipe 2; T3 return pipe 3; T4 return pipe 4; Ph. High-pressure oil pipe; PL; Low-pressure oil pipe; 12. Electric motor; 13. Duplex pump; 14. Suction pipe; 15. Low-pressure oil port; 16. High-pressure oil port; 111. Oil inlet 1; 112. Oil inlet 2; 113. Cylinder body; 114. Fixing bolt; 115. Fixing cylinder; 116. Piston sleeve. DETAILED DESCRIPTION

[0026] The present invention is further explained below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. In the description of the present invention, it should be noted that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "top", "bottom", etc. is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing 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 therefore cannot be understood as a limitation of the present invention. In addition, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal connection of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific circumstances.

[0027] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0028] This patent provides a variety of parallel solutions. The different expressions are improved solutions or parallel solutions based on the basic solution. Each solution has its own unique characteristics. In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other. The fixing method not described in the text can be any fixing method such as thread fixing, bolt fixing or glue bonding.

[0029] Embodiment 1: Combined with all the drawings; Scheme 1:

[0030] A multi-purpose punching cylinder with high and low pressure matching, characterized in that the punching cylinder 10 includes a cylinder body 113, the cylinder body 113 is cylindrical, the cylinder body 113 is fixed to a fixed cylinder 115 by a fixing bolt 114, the fixed cylinder 115 includes an oil inlet 111, the lower part of the oil inlet 111 can squeeze the piston from the first action surface 118, the fixed cylinder 115 can fit the groove position of the extruded piston, the cylinder body 113 includes an oil inlet 2 112, the oil inlet 2 112 leads to the annular surface 117 of the extruded piston. The substantial technical effect of the technical solution here and its implementation process are as follows: in the implementation process, a single oil inlet inlet has a relatively low pressure, and when the two oil inlets are simultaneously filled with oil, compound work is achieved.

[0031] Embodiment 2: As a further improved solution or parallel solution or optional independent solution, the piston sleeve 116 is fixed by the fixing bolt 114 below the cylinder body 113, and the extrusion piston can move from the piston in the piston sleeve 116. The substantial technical effect and the implementation process of the technical solution here are as follows: This embodiment provides a preferred structure, in fact, the piston sleeve 116 can be made integrally with the cylinder body 113, but in this case, the piston cannot be replaced; this embodiment is made into a detachable connection, and the internal piston can be replaced.

[0032] Embodiment 3: As a further improved solution or parallel solution or optional independent solution, the lower part of the extrusion piston and the inner wall of the cylinder 113 contain a gap, and the cylinder 113 contains an oil return port 119, and the oil return port 119 points to the gap. The substantial technical effect and implementation process of the technical solution here are as follows: the oil return port points to the gap to achieve resetting.

[0033] Embodiment 4: As a further improved solution or a parallel solution or an optional independent solution, the gap is formed by the piston sleeve 116 , the piston, and the cylinder body 113 .

[0034] Embodiment 5: As a further improved scheme or parallel scheme or selectable independent scheme, the duplex pump extends out with two oil circuits, which are respectively a high-pressure oil pipe Ph and a low-pressure oil pipe PL; the high-pressure oil pipe Ph is connected to the solenoid valve 1 3 and the cartridge valve 1 5 and then connected to the punching cylinder 10, and the high-pressure oil pipe Ph is also connected to the pressure switching valve 7 and the punching main valve 8; the low-pressure oil pipe PL is connected to the one-way valve 1 and then connected to the pressure switching valve 7, the punching main valve 8 is connected to the punching cylinder 10, and the cartridge valve 2 6 is also connected to the return pipe 1 T1, the return pipe 2 T2, the return pipe 3 T3, and the return pipe 4 T4; the return pipe 1 T1, the return pipe 2 T2, the return pipe 3 T3, and the return pipe 4 T4 are connected to the oil suction pipe 14.

[0035] Option 2:

[0036] Embodiment 6: As a further improveable scheme or parallel scheme or selectable independent scheme, a hydraulic valve oil circuit that automatically switches between high and low pressures is characterized in that two oil circuits extend from the double pump, and the two oil circuits are respectively a high-pressure oil pipe Ph and a low-pressure oil pipe PL; the high-pressure oil pipe Ph is connected to the solenoid valve 1 3 and the cartridge valve 1 5 and then connected to the punching cylinder 10, and the high-pressure oil pipe Ph is also connected to the pressure switching valve 7 and the punching main valve 8; the low-pressure oil pipe PL is connected to the one-way valve 1 and then connected to the pressure switching valve 7, the punching main valve 8 is connected to the punching cylinder 10, and the cartridge valve 2 6 is also connected to the return pipe 1 T1, the return pipe 2 T2, the return pipe 3 T3, and the return pipe 4 T4; the return pipe 1 T1, the return pipe 2 T2, the return pipe 3 T3, and the return pipe 4 T4 are connected to the oil suction pipe 14. The substantial technical effect of the technical solution here and its implementation process are as follows: In order to increase the punching speed, increasing the number of return oil pipelines, such as return pipe 1 T1, return pipe 2 T2, return pipe 3 T3, and return pipe 4 T4, is also an effective measure to increase the speed. Start the oil pump motor, and the high and low pressures reach the set pressure. At this time, one line of oil in the low-pressure oil circuit passes through the low-pressure oil pipe PL to reach the lower chamber of the oil cylinder, and the other line of oil passes through the one-way valve 1 and communicates with the P port of the punching main valve 8. At this time, the punching main valve is in the upper working position of the three working positions under the action of the spring, so that the main oil cylinder returns to the top position and waits for the operation instruction. When the pilot valve 1 YV5 is energized, the main valve is in the middle working position, the oil cylinder descends, and under the action of the cylinder, it remains in the upper position of the predetermined working position. The high-pressure oil circuit is connected to the P port of the punching main valve 8 through the pressure switching valve 7. When the pilot valve 2 YV4 is energized, the punching main valve works in the lower position. One of the pressure oil passes through the A cavity of the punching main valve and enters the upper cavity of the small cylinder fixed cylinder, and the other passes through the cartridge valve 2 6 and enters the cylinder ring. At this time, the maximum punching force is guaranteed. When the pilot valve 2 YV4 and the cartridge valve 2 6 are energized at the same time, all the oil in the punching main valve enters the upper cavity of the small cylinder to meet the fastest punching frequency when processing thin plates. When the load gradually increases, the pressure in the upper cavity of the cylinder reaches the set pressure of the pressure switching valve 7. At this time, the upper working position of the pressure switching valve 7 works, and the high-pressure oil mixes with the low-pressure oil, and participates in the punching of the workpiece by the cylinder at the same time, ensuring the maximum punching force of the system. When punching thin-walled small holes, the switching valve remains disconnected, and the high-pressure oil cannot enter the upper cavity of the cylinder. At this time, the motor only drives the low-pressure oil to work, saving power. Pilot valve three YV6 is solenoid valve one 3, which controls the opening and closing of cartridge valve one 5; pilot valve four YV7 is solenoid valve two 4, which controls the opening and closing of cartridge valve two 6; at the same time, cartridge valve two 6 is also an oil return valve.

[0037] Embodiment 7: As a further improved solution or a parallel solution or an optional independent solution, the high-pressure oil pipe Ph is connected to the high-pressure accumulator 2 - 1 .

[0038] Embodiment 8: As a further improved solution or a parallel solution or an optional independent solution, the low-pressure oil pipe PL is connected to the low-pressure accumulator 2-2.

[0039] Embodiment 9: As a further improved solution or a parallel solution or an optional independent solution, the punching main valve 8 is communicatively connected to the electro-hydraulic pilot valve 9 .

[0040] Embodiment 10: As a further improved solution or a parallel solution or an optional independent solution, the one-way valve 1, the high-pressure accumulator 2-1, the low-pressure accumulator 2-2, the solenoid valve 1 3, the solenoid valve 2 4, and the cartridge valve 1 5, the cartridge valve 2 6 are installed on a valve plate.

[0041] Embodiment 11: As a further improved scheme or parallel scheme or optional independent scheme, this patent relates to a special hydraulic circuit for processing automobile longitudinal beams. Compared with ordinary hydraulic transmission circuits, the main advantages of this circuit are high punching frequency and large punching force, so the production efficiency is high. Specifically, the main factors are as follows: first, the application of the high and low pressure switching valve invented in this patent; second, the application of the differential circuit in the oil circuit; and finally, the application of multiple return oil pipelines to reduce the return oil resistance. As shown in the schematic diagram, the power is provided by high and low pressure dual oil circuits. The low-pressure oil is directly connected to the accumulator and enters the lower chamber of the main punch cylinder. During the idle stroke, the solenoid valve at one end of the electro-hydraulic valve is energized, and the low-pressure oil enters the upper chamber of the cylinder through the P port of the electro-hydraulic valve. A differential circuit is formed, so that the cylinder quickly approaches the workpiece; when the workpiece is contacted, the one-way valve reverses to cut off the low-pressure channel, the system pressure increases to punch the workpiece, and the high and low pressures are automatically switched as the load changes. As the load increases, the system automatically cancels the differential circuit, and a large punching force can be obtained at this time. The lower chamber of the oil cylinder is directly connected to the low pressure and connected to the accumulator. The accumulator is used for rapid return of the system, rapid oil replenishment to the upper chamber of the oil cylinder when punching the differential circuit, and buffering during the downward movement of the oil cylinder to prevent the piston from hitting the bottom of the cylinder and reduce the failure rate.

[0042] As a further note:

[0043] The motor drives the duplex pump, the high-pressure oil circuit PL is generated by the high-pressure outlet of the lower end cover of the duplex pump, and the low-pressure PL is generated by the low-pressure outlet at the upper end of the duplex pump.

[0044] The function of the pressure switching valve 7 is as mentioned above. When the load pressure increases, the high-pressure oil circuit automatically opens the switching valve, allowing the high-pressure oil to enter the punching main valve P, and then enter the system to complete high-pressure punching, ensuring the maximum punching force of the system.

[0045] The high-pressure oil circuit is used to obtain higher punching power, and the low-pressure oil circuit completes the punching no-load operation and fast return. It can also effectively control hydraulic shock, prevent machine vibration, reduce heat, and reduce mechanical failures.

[0046] An electric motor is used to drive a double pump to generate two pressure oil circuits, and a pressure valve is used to generate two pressures.

[0047] The use of double pump and motor vertical installation, immersed oil pump reduces external leakage points and effectively reduces system noise such as Figure 2 shown.

[0048] Multiple valves are installed on one valve plate, with a simple and compact structure.

[0049] The high and low pressure differential circuit realizes efficient punching. The one-way valve 1 automatically selects the hydraulic circuit according to the load change, realizes the differential circuit conversion, and improves the punching efficiency.

[0050] It should be noted that the solution in this paragraph is at least a new type of intelligent multi-purpose device, which is an individual that can be sold independently, and the solutions in the following paragraphs are parallel solutions or improved solutions.

[0051] Innovatively, each of the above effects exists independently, and a set of structures can be used to combine the above results.

[0052] The electrical components mentioned in this article are all connected to an external main controller and 220V mains electricity, and the main controller can be a conventional known device for control such as a computer.

[0053] The basic principle, main features and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the protection required.

Claims

1. A method for differential punching of oil circuits, characterized in that: Utilize a multi-purpose punching cylinder with high and low pressure fit; A multi-purpose punching cylinder structure with high and low pressure matching is as follows: the punching cylinder (10) comprises a cylinder body (113), the cylinder body (113) is cylindrical, the cylinder body (113) is fixed to a fixed cylinder (115) by a fixing bolt (114), the fixed cylinder (115) comprises an oil inlet port 1 (111), the lower part of the oil inlet port 1 (111) can squeeze a piston from a first action surface (118), the fixed cylinder (115) can fit into the groove position of the piston, the cylinder body (113) comprises an oil inlet port 2 (112), the oil inlet port 2 (112) leads to the annular surface (117) of the piston for squeezing; A piston sleeve (116) is fixed below the cylinder body (113) by means of a fixing bolt (114), and the piston can perform piston motion in the piston sleeve (116); The bottom of the piston and the inner wall of the cylinder body (113) contain a gap, and the cylinder body (113) contains an oil return port (119), and the oil return port (119) points to the gap; The gap is formed by the piston sleeve (116), the piston, and the cylinder body (113); The double pump extends out with two oil circuits, which are respectively a high-pressure oil pipe (Ph) and a low-pressure oil pipe (PL); the high-pressure oil pipe (Ph) is connected to the solenoid valve 1 (3) and the cartridge valve 1 (5), and then connected to the punching cylinder (10); the high-pressure oil pipe (Ph) is also connected to the pressure switching valve (7) and the punching main valve (8); the low-pressure oil pipe (PL) is connected to the check valve (1) and then connected to the pressure switching valve (7); the punching main valve (8) is connected to the punching cylinder (10); the cartridge valve 2 (6) is also connected to the return pipe 1 (T1), the return pipe 2 (T2), the return pipe 3 (T3), and the return pipe 4 (T4); the return pipe 1 (T1), the return pipe 2 (T2), the return pipe 3 (T3), and the return pipe 4 (T4) are connected to the oil suction pipe (14); the cartridge valve 2 (6) is an oil return valve; The following steps are included: The motor (12) is started, and the high and low pressures reach the set pressures. At this time, the oil in one path of the low-pressure oil circuit passes through the low-pressure oil pipe (PL) to reach the lower chamber of the punching cylinder (10), and the oil in the other path passes through the one-way valve (1) and communicates with the P port of the punching main valve (8). At this time, the punching main valve (8) is in the upper working position of the three working positions under the action of the spring, so that the punching cylinder (10) returns to the topmost position and waits for the operation instruction; When the pilot valve YV5 is energized, the punching main valve (8) is in the middle working position, and the punching cylinder (10) descends and remains in the upper position of the predetermined working position; The high-pressure oil circuit is connected to the P port of the punching main valve (8) through the pressure switching valve (7). When the pilot valve 2 YV4 is energized, the punching main valve (8) works in the lower position. One path of the pressure oil enters the upper chamber of the fixed cylinder (115) through the A chamber of the punching main valve, and the other path enters the annular surface (117) of the piston through the cartridge valve 1 (5). At this time, the maximum punching force is guaranteed. When pilot valve 2 YV4 and cartridge valve 2 (6) are energized at the same time, the pressure oil of the punching main valve all enters the upper chamber of the fixed cylinder (115), meeting the fastest punching frequency when processing thin plates; When the load gradually increases, the pressure in the upper chamber of the punching cylinder (10) reaches the set pressure of the pressure switching valve (7). At this time, the upper working position of the pressure switching valve (7) works, and the high-pressure oil mixes with the low-pressure oil, and simultaneously participates in punching the workpiece by the punching cylinder (10), thereby ensuring the maximum punching force of the system; When punching a thin-walled small hole, the pressure switching valve (7) remains disconnected, and the high-pressure oil cannot enter the upper chamber of the punching cylinder (10). At this time, the motor only drives the low-pressure oil to do work, which is used to save power. Pilot valve three YV6 is solenoid valve one (3), which controls the opening and closing of cartridge valve one (5); pilot valve four YV7 is solenoid valve two (4), which controls the opening and closing of cartridge valve two (6).

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