CN110778544B - Hydraulic driving system of numerical control punch and hydraulic source device thereof - Google Patents
Hydraulic driving system of numerical control punch and hydraulic source device thereof Download PDFInfo
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- CN110778544B CN110778544B CN201911174501.0A CN201911174501A CN110778544B CN 110778544 B CN110778544 B CN 110778544B CN 201911174501 A CN201911174501 A CN 201911174501A CN 110778544 B CN110778544 B CN 110778544B
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- 238000000034 method Methods 0.000 claims abstract description 20
- 239000003921 oil Substances 0.000 claims description 237
- 239000010720 hydraulic oil Substances 0.000 claims description 11
- 238000004140 cleaning Methods 0.000 claims description 8
- 238000005192 partition Methods 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 238000004080 punching Methods 0.000 abstract description 14
- 238000013461 design Methods 0.000 abstract description 4
- 239000007788 liquid Substances 0.000 description 11
- 239000012535 impurity Substances 0.000 description 7
- 238000012545 processing Methods 0.000 description 7
- 238000003754 machining Methods 0.000 description 5
- 230000017525 heat dissipation Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000012549 training Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
- F15B11/024—Systems essentially incorporating special features for controlling the speed or actuating force of an output member by means of differential connection of the servomotor lines, e.g. regenerative circuits
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/02—Stamping using rigid devices or tools
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/26—Supply reservoir or sump assemblies
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/04—Special measures taken in connection with the properties of the fluid
- F15B21/041—Removal or measurement of solid or liquid contamination, e.g. filtering
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/04—Special measures taken in connection with the properties of the fluid
- F15B21/042—Controlling the temperature of the fluid
- F15B21/0423—Cooling
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/04—Special measures taken in connection with the properties of the fluid
- F15B21/044—Removal or measurement of undissolved gas, e.g. de-aeration, venting or bleeding
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Control Of Presses (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention provides a hydraulic driving system of a numerical control punch, which enables a punch to descend at maximum speed to process a workpiece and to ascend and return rapidly during punching through the design of a simple and easily connected differential circuit, a hydraulic circuit and a hydraulic source device of the numerical control punch. The fast-forward and fast-backward efficiency of the whole process is greatly improved, the requirement of the numerical control punch on the rapidity can be met, the requirement of punching equipment on the stability can be met, the maximum working load of the system is 200KN, the maximum stroke is 40mm, the working stroke is 12mm, and the punching frequency is the requirement of the punch with the frequency of 250 times/min.
Description
Technical Field
The invention relates to the technical field of hydraulic pressure, in particular to a hydraulic driving system of a numerical control punch and a hydraulic source device thereof.
Background
Many mechanical productions in daily life are applied to numerical control punches. For example, the processing of various metal sheet parts, the processing modes of various holes such as stretching holes and the like are also processed by a numerical control punch, so that the processing procedures of holes with different sizes or different hole distances can be convenient, and the processing method is also suitable for some special processes such as reinforcing ribs, stretching holes and shutters. For the traditional processing mode, the numerical control punch can process various small-batch and diversified products very conveniently, and only the simple combination of the dies is needed. The numerical control punch has the advantages of saving a large amount of time and cost, being very applicable to the field of numerical control punches and being very high in processing efficiency, so that the numerical control punch can be well adapted to the changes of markets and products.
Compared with a common punch, the numerical control punch has the characteristics of high machining precision, stable machining quality, large machining breadth, capability of finishing machining breadth of 1.5m at one time, capability of performing multi-coordinate linkage, capability of machining parts with complex shapes, capability of performing shearing forming and the like. The numerical control punch is simple and convenient to use and operate, can be operated by hands after training for 2-3 days as long as the numerical control punch has certain basic computer knowledge, and can be used for processing different parts by changing processing programs, so that the production preparation time is saved, and the production rate is improved. The degree of automation of the numerical control punch is relatively high, and the labor intensity can be greatly reduced.
Compared with the traditional mechanical punch press, the hydraulic high-speed punch press is free of flywheel, crank connecting rod, clutch, brake and other parts, has the advantages of high punching frequency, adjustable punching stroke/pressure, stable boosting, low noise, no vibration and the like, accords with the development trend of a high-end punch press with high speed, precision and flexibility, utilizes the interconversion of pressure energy and mechanical energy to fully utilize energy, and greatly reduces the energy loss. The core part of the hydraulic high-speed punching machine is the whole hydraulic system, and the design of the hydraulic source device of the core part is particularly important. However, the conventional hydraulic system and the device thereof have various problems from the viewpoints of an operation method, a working mode, a complicated structure and the like, which results in low working efficiency, heavy equipment weight and high overall cost.
Disclosure of Invention
In order to solve the problems, the invention provides a hydraulic driving system of a numerical control punch press, which comprises an oil tank, a motor, an axial plunger pump, an air filter, an oil return filter, a cooler, a pressure gauge, a two-position four-way electromagnetic valve, a one-way valve, an overflow valve, a proportional servo valve, a hydraulic control reversing valve and a hydraulic cylinder, wherein the two sides of the axial plunger pump are respectively connected with the motor and the oil tank, the air filter is connected to a top cover of the oil tank, the pressure gauge is arranged on the axial plunger pump, the hydraulic cylinder is provided with a rodless cavity and a rod cavity, during an oil supply process, hydraulic oil in the oil tank sequentially passes through the axial plunger pump, the two-position electromagnetic valve and the proportional servo valve and then reaches the hydraulic cylinder after passing through the axial plunger pump, the two-position electromagnetic valve and the proportional servo valve, and the oil return valve, and the hydraulic cylinder in turn to form a differential connection loop through the rod cavity, the hydraulic control reversing valve, the overflow valve and the rod cavity of the hydraulic cylinder when the hydraulic oil flows from the rod cavity to the rodless cavity, and the hydraulic cylinder in the punching process, and the hydraulic oil in turn passes through the two-position electromagnetic valve and the four-way valve and the hydraulic cylinder after passing through the oil reversing valve and the hydraulic cylinder in turn. When the hydraulic system is operated, the differential connection loop is arranged and is simple and easy to connect, the rod cavity and the rodless cavity of the hydraulic cylinder are communicated through the differential connection loop, the fast forward efficiency is greatly improved, and when the hydraulic system is fast retracted, the rod cavity and the rodless cavity at the lower part of the hydraulic cylinder are connected with the oil tank through the hydraulic loop, and the fast retract efficiency of the punch is also greatly improved. The air filter is arranged to enable the oil tank to be communicated with the atmosphere, so that the pump can absorb oil normally all the time, and the phenomenon that negative pressure can not occur when the liquid level in the oil tank changes is guaranteed. And secondly, the device can filter air, remove impurities and the like in the air and also serve as an oil filling hole, so that the oil quality in the oil tank is ensured. The location is typically where the tank top cap is near the edge.
As a further improvement of the invention, the hydraulic cylinder is a WY1-FD2110A31.540B-D hydraulic cylinder, the axial plunger pump is a 25-CY 14-1B sloping cam type axial plunger pump, the motor is a Y180L-4 motor, the hydraulic control reversing valve is a DLHZOR-TE-14-L7141 reversing valve, the overflow valve is a YF-L10K overflow valve, the air filter is a QUQ2.5b air filter, the cooler is an OR-350 water cooler, and the oil return filter is a RFA-250 multiplied by 20L oil return filter.
The invention also provides a hydraulic source device for the hydraulic driving system of the numerical control punch press, which comprises a motor, a motor support, an overflow valve, an axial plunger pump, a pump support, a coupler, an oil tank, an oil suction pipe and an oil return pipe, wherein the motor is connected to the motor support through bolts, the axial plunger pump is connected with the motor through the coupler, the pump support is connected to the motor support and is used for supporting the axial plunger pump, the oil tank is arranged below the motor support, the overflow valve is arranged on a top cover of the oil tank, an air filter is arranged in a through hole in the top cover of the oil tank, the oil suction pipe is connected with the axial plunger pump and the oil tank, the end part of the oil suction pipe is provided with the oil suction filter and is arranged below the lowest oil surface of the oil tank, the orifice of the oil return pipe is provided with the oil return filter, the bottom plate of the oil tank is set to have a gradient of 5-10 degrees, the bottom end is provided with an oil drain plug, the inside the oil tank is provided with an oil hole between the oil suction pipe and the oil return pipe, and the height of the oil baffle is higher than the oil surface. The baffle plate is used for separating the oil suction pipe from the oil return pipe, so that oil circularly flows in the oil tank, bubbles and impurities brought in by the oil return can be separated, and heat dissipation and precipitation are facilitated. The bottom plate of the oil tank is placed into a certain gradient, and the oil drain hole is arranged at the bottommost end so as to facilitate the discharge of dirty oil. The pump bracket is used for fixing the pump to continuously pump oil from the oil tank and input the oil into the hydraulic system to ensure the normal operation of the system as a further improvement of the invention, the oil tank is rectangular and is formed by welding steel plates, and the side wall of the oil tank is provided with a cleaning window. The cleaning window can conveniently clean the internal environment of the oil tank, and the loading and unloading of the oil absorption filter are generally completed through the cleaning window.
As a further improvement of the invention, the side wall of the oil tank is provided with a liquid level meter. By which the oil level in the tank is viewed, the highest oil level and the lowest oil level can be observed.
As a further improvement of the invention, a thermometer, a temperature controller and a heat exchanger are arranged on the side wall of the oil tank.
As a further improvement of the invention, the liquid level gauge and the thermometer are integrally arranged on the side wall of the oil tank. The structure is simplified, and the temperature and the oil level of the oil tank are conveniently measured.
As a further improvement of the invention, lifting lugs are arranged on two sides of the oil tank, and supporting feet are arranged on the bottom of the oil tank. The support legs are arranged to enable air around the oil tank to flow well, the oil tank is easy to dissipate heat, and the lifting lugs are arranged to facilitate lifting and transportation.
The beneficial effects of the invention are as follows: according to the hydraulic driving system, through the design of the differential circuit, the hydraulic circuit and the hydraulic source device of the numerical control punch press which are simple and easy to connect, the punch head descends at the maximum speed during punching to process a workpiece, and ascends and returns quickly. The fast-forward and fast-backward efficiency of the whole process is greatly improved, the requirement of the numerical control punch on the rapidity can be met, the requirement of punching equipment on the stability can be met, the maximum working load of the system is 200KN, the maximum stroke is 40mm, the working stroke is 12mm, and the punching frequency is the requirement of the punch with the frequency of 250 times/min.
Drawings
FIG. 1 is a schematic diagram of the hydraulic drive system of the numerical control press of the present invention;
FIG. 2 is a front view of a hydraulic source device for a hydraulic drive system of a numerical control press according to the present invention;
FIG. 3 is a left side view of FIG. 2;
FIG. 4 is a top view of FIG. 2;
wherein, the drawing is marked as 1, a motor 2, an axial plunger pump 3, an air filter 4, an oil return filter 5, a cooler 6, a pressure gauge 7, a two-position four-way electromagnetic valve 8, a one-way valve 9, an overflow valve 10, a proportional servo valve 11, a hydraulic control reversing valve 12, a hydraulic cylinder 13, a rodless cavity 14, a rod cavity 15, a punch 19, an oil tank 20, a motor support 21 and a pump support
22. The oil suction device comprises a coupler 23, a liquid level meter 24, a lifting lug 25, a partition 26, an oil drain plug 27, a cleaning window 28, an oil suction filter 29, a support leg 30 and an oil suction pipe.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1, a hydraulic driving system of a numerical control punch press comprises an oil tank 19, a motor 1, an axial plunger pump 2, an air filter 3, an oil return filter 4, a cooler 5, a pressure gauge 6, a two-position four-way electromagnetic valve 7, a one-way valve 8, an overflow valve 9, a proportional servo valve 10, a hydraulic reversing valve 11 and a hydraulic cylinder 12, wherein the two sides of the axial plunger pump 2 are respectively connected with the motor 1 and the oil tank 19, the air filter 3 is connected to a top cover of the oil tank 19, the pressure gauge 6 is arranged on the axial plunger pump 2, the hydraulic cylinder 12 is provided with a rodless cavity 13 and a rod cavity 14, an oil inlet end of the axial plunger pump 2 is connected with the oil tank 19, an oil outlet end of the one-way valve 8 is connected with an oil inlet end of the one-way valve 8, an oil outlet end of the one-way valve 8 is also connected with the rod cavity of the hydraulic cylinder 12 through the proportional servo valve 10, the proportional servo valve 10 is a four-position four-way proportional servo valve, the hydraulic reversing valve 11 is a two-position three-way reversing valve, the rodless cavity of the hydraulic reversing valve 12 and the proportional servo valve 10 is connected with the two-position four-way valve, and the two-way valve 7 is connected with the oil return valve 7 through the oil outlet end of the four-way valve 7 and the two-way valve 2, and the oil outlet end of the two-way valve 8 is connected with the oil valve 7 through the oil inlet end of the four-way valve 7 and the valve 2; the oil inlet end of the overflow valve 9 is connected with the oil outlet end of the one-way valve 8, the oil outlet end of the overflow valve 9 is connected with the oil inlet end of the cooler 5, the cooler 5 and the oil return filter 4 are arranged on an oil return branch of the system in series, and oil return ports of the proportional servo valve 10 and the hydraulic control reversing valve 11 are connected with the oil return branch; during the oil supply process, hydraulic oil in an oil tank 19 sequentially passes through an axial plunger pump 2, a two-position four-way electromagnetic valve 7 and a proportional servo valve 10 and then reaches a hydraulic cylinder 12, during the fast forward process, a rod cavity 14 of the hydraulic cylinder, a hydraulic control reversing valve 11, an overflow valve 9, a proportional servo valve 10 and a rod-free cavity 13 of the hydraulic cylinder are sequentially communicated to form a differential connection loop, hydraulic oil flows from the rod cavity 14 to the rod-free cavity 13, during the punching process, the hydraulic oil in the oil tank 19 sequentially passes through the axial plunger pump 2, the two-position four-way electromagnetic valve 7, the proportional servo valve 10, the rod-free cavity 13 of the hydraulic cylinder, the rod cavity 14 of the hydraulic cylinder, the hydraulic control reversing valve 11, the cooler 5 and an oil return filter 4 and then returns to the oil tank 19, and during the fast backward process, the hydraulic oil in the oil tank 19 sequentially passes through the axial plunger pump 2, the one-way valve 8, the hydraulic control reversing valve 11, the rod cavity 14 of the hydraulic cylinder, the rod-free cavity 13, the proportional servo valve 10, the cooler 5 and the oil return filter 4 and then returns to the oil tank 19. When the hydraulic system is operated, the differential connection loop is arranged and is simple and easy to connect, the rod cavity and the rodless cavity of the hydraulic cylinder are communicated through the differential connection loop, the fast forward efficiency is greatly improved, and when the hydraulic system is fast retracted, the rod cavity and the rodless cavity at the lower part of the hydraulic cylinder are connected with the oil tank through the hydraulic loop, and the fast retract efficiency of the punch is also greatly improved. The air filter is arranged to enable the oil tank to be communicated with the atmosphere, so that the pump can absorb oil normally all the time, and the phenomenon that negative pressure can not occur when the liquid level in the oil tank changes is guaranteed. And secondly, the device can filter air, remove impurities and the like in the air and also serve as an oil filling hole, so that the oil quality in the oil tank is ensured. The location is typically where the tank top cap is near the edge.
The hydraulic cylinder 12 is a WY1-FD2110A31.540B-D hydraulic cylinder, the axial plunger pump is a 25-cylinder Y14-1B swash plate type axial plunger pump, the motor 1 is a Y180L-4 motor, the hydraulic control reversing valve 11 is a DLHZOR-TE-14-L7141 reversing valve, the overflow valve 9 is a YF-L10K overflow valve, the air filter 3 is a QUQ2.5b air filter, the cooler 5 is an OR-350 water cooler, and the oil return filter 4 is an RFA-250 multiplied by 20L oil return filter.
The invention also provides a hydraulic source device for the hydraulic driving system of the numerical control punch, as shown in fig. 2-4, the hydraulic source device comprises a motor 1, a motor support 20, an overflow valve 9, an axial plunger pump 2, a pump support 21, a coupler 22, an oil tank 19, an oil suction pipe 30 and an oil return pipe, wherein the motor 1 is connected to the motor support 20 through bolts, the axial plunger pump 2 is connected with the motor 1 through the coupler 22, the pump support 21 is connected to the motor support 20 and used for supporting the axial plunger pump 2, the oil tank 19 is arranged below the motor support 20, the overflow valve 9 is arranged on a top cover of the oil tank 19, an air filter 3 is arranged in a through hole on the top cover of the oil tank 19, the oil suction pipe 30 is connected with the axial plunger pump 2 and the oil tank 19, an oil suction filter 28 is arranged at the end part of the oil suction pipe 30 and is arranged below the lowest oil surface of the oil tank 19, an oil return filter 4 is arranged at the mouth of the oil return pipe, a bottom plate of the oil tank 19 is arranged at 5-10 degrees gradient, an oil drain hole is arranged at the bottom end, an oil drain plug 26 is arranged at the bottom of the oil drain hole, a partition 25 is arranged between the oil suction pipe 30 and the oil return pipe 19, and the oil is higher than the oil level of the oil tank 19. The baffle is used for separating the oil suction pipe from the oil return pipe, so that oil circularly flows in the oil tank, bubbles and impurities brought in by the oil return can be separated, heat dissipation and precipitation are facilitated, 12 baffles are generally arranged, and the baffles are generally higher than the oil surface, so that the oil flows through the side surfaces of the baffles. The bottom plate of the oil tank is placed into a certain gradient, and the oil drain hole is arranged at the bottommost end so as to facilitate the discharge of dirty oil. The drain hole may be plugged with a drain plug 26 during operation of the system.
The distance between the oil suction pipe 30 and the oil return pipe is sufficiently large. The oil can more easily precipitate impurities through long-distance flow. And the oil suction pipe is inserted below the lowest oil level, so that air can not be sucked when the oil is sucked, and the fluctuation of the liquid level can not be too large when the oil is returned. Most faults of the hydraulic system are caused by pollution of a liquid medium, impurities in oil liquid can block a valve port, abrasion of parts is accelerated, and the service life of the parts is shortened. Therefore, the inlet of the oil suction pipe should be provided with an oil suction filter 28, the installation position of the filter is not less than 50mm away from the bottom of the oil tank, and the installation position is too low to enable sediment at the bottom to be sucked into the pump. The oil suction pipe must ensure sufficient space from the wall of the tank, so that the oil around the oil suction pipe can flow smoothly when sucking oil. The mouth of the oil return pipe is provided with an oil return filter 4. The distance between the oil return pipe and the bottom of the box body is larger than 23 times of the pipe diameter so as to avoid splashing and foaming. The filter effectively prevents impurities in the oil liquid, and the quality of the oil liquid in the system is greatly improved.
The pump bracket is used for fixing the pump to continuously pump oil from the oil tank and input the oil into the hydraulic system so as to ensure the normal operation of the system.
The oil tank 19 is rectangular and is formed by welding steel plates, so that the maximum heat dissipation area can be achieved, and heat dissipation is facilitated. The side wall of the oil tank 19 is provided with a cleaning window 27. The cleaning window can conveniently clean the internal environment of the oil tank, and the loading and unloading of the oil absorption filter are generally completed through the cleaning window.
A level gauge 23 is mounted to the side wall of the tank 19. By which the oil level in the tank is viewed, the highest oil level and the lowest oil level can be observed.
The side wall of the oil tank 19 is provided with a thermometer, a temperature controller and a heat exchanger. The normal temperature of the oil temperature in the oil tank is 30-50 ℃, the maximum temperature difference is 15-65 ℃, and a thermometer, a temperature controller and a heat exchanger are arranged when necessary.
The liquid level meter and the thermometer are integrally arranged on the side wall of the oil tank. The structure is simplified, and the temperature and the oil level of the oil tank are conveniently measured.
Lifting lugs 24 are mounted on both sides of the oil tank 19, and support legs 29 are mounted on the bottom. In order to ensure good ventilation of the surrounding air of the oil tank, the bottom of the oil tank which is easy to dissipate heat should be separated from the ground by a distance, which is generally more than 150 mm. Lifting lugs are arranged for convenient lifting and transportation.
The beneficial effects of the invention are as follows: according to the hydraulic driving system, through the design of the differential circuit, the hydraulic circuit and the hydraulic source device of the numerical control punch press which are simple and easy to connect, the punch head descends at the maximum speed during punching to process a workpiece, and ascends and returns quickly. The fast-forward and fast-backward efficiency of the whole process is greatly improved, the requirement of the numerical control punch on the rapidity can be met, the requirement of punching equipment on the stability can be met, the maximum working load of the system is 200KN, the maximum stroke is 40mm, the working stroke is 12mm, and the punching frequency is the requirement of the punch with the frequency of 250 times/min.
The above description is only of the preferred embodiment of the present invention, and is not intended to limit the present invention in any other way, but is intended to cover any modifications or equivalent variations according to the technical spirit of the present invention, which fall within the scope of the present invention as defined by the appended claims.
Claims (7)
1. The hydraulic driving system of the numerical control punch press comprises an oil tank (19), a motor (1), an axial plunger pump (2), an air filter (3), an oil return filter (4), a cooler (5), a pressure gauge (6), a two-position four-way electromagnetic valve (7), a one-way valve (8), an overflow valve (9), a proportional servo valve (10), a hydraulic control reversing valve (11) and a hydraulic cylinder (12), and is characterized in that the motor (1) and the oil tank (19) are respectively connected to two sides of the axial plunger pump (2), the air filter (3) is connected to a top cover of the oil tank (19), the pressure gauge (6) is arranged on the axial plunger pump (2), and the hydraulic cylinder (12) is provided with a rodless cavity (13) and a rod cavity (14);
the oil inlet end of the axial plunger pump (2) is connected with the oil tank (19), the oil outlet end is connected with the oil inlet end of the one-way valve (8), the oil outlet end of the one-way valve (8) is connected with the rodless cavity of the hydraulic cylinder (12) through the proportional servo valve (10), the oil outlet end of the one-way valve (8) is also connected with the rod cavity of the hydraulic cylinder (12) through the hydraulic control reversing valve (11), the proportional servo valve (10) is a four-position four-way proportional servo valve, the hydraulic control reversing valve (11) is a two-position three-way reversing valve, an oil path between the rodless cavity of the hydraulic cylinder (12) and the proportional servo valve (10) is communicated with the control end of the hydraulic control reversing valve (11), the oil inlet end of the two-position four-way solenoid valve (7) is connected with the oil outlet end of the axial plunger pump (2), and the oil return port of the two-position four-way solenoid valve (7) is connected with the oil tank (19) through the cooler (5) and the oil return filter (4); the oil inlet end of the overflow valve (9) is connected with the oil outlet end of the one-way valve (8), the oil outlet end of the overflow valve (9) is connected with the oil inlet end of the cooler (5), the cooler (5) and the oil return filter (4) are arranged on an oil return branch of the system in series, and oil return ports of the proportional servo valve (10) and the hydraulic control reversing valve (11) are connected with the oil return branch;
in the oil supply process, hydraulic oil in the oil tank (19) sequentially passes through the axial plunger pump (2), the two-position four-way electromagnetic valve (7) and the proportional servo valve (10) and then reaches the hydraulic cylinder (12);
in the fast-forward process, a rod cavity (14), a hydraulic control reversing valve (11), an overflow valve (9), a proportional servo valve (10) and a rod-free cavity (13) of the hydraulic cylinder are sequentially communicated to form a differential connection loop, and hydraulic oil flows from the rod cavity (14) to the rod-free cavity (13);
during the stamping process, hydraulic oil in the oil tank (19) sequentially passes through the axial plunger pump (2), the two-position four-way electromagnetic valve (7), the proportional servo valve (10), the rodless cavity (13) of the hydraulic cylinder, the rod cavity (14) of the hydraulic cylinder, the hydraulic control reversing valve (11), the cooler (5) and the oil return filter (4) and then returns to the oil tank (19);
during the quick-return process, hydraulic oil in the oil tank (19) sequentially passes through the axial plunger pump (2), the one-way valve (8), the hydraulic control reversing valve (11), the rod cavity (14) of the hydraulic cylinder, the rodless cavity (13) of the hydraulic cylinder, the proportional servo valve (10), the cooler (5) and the oil return filter (4) and then returns to the oil tank (19).
2. A hydraulic source device with a hydraulic drive system of a numerical control press as claimed in claim 1, characterized by comprising a motor (1), a motor support (20), an overflow valve (9), an axial plunger pump (2), a pump support (21), a coupler (22), an oil tank (19), an oil suction pipe (30) and an oil return pipe, wherein the motor (1) is connected to the motor support (20) through bolts, the axial plunger pump (2) is connected to the motor (1) through the coupler (22), the pump support (21) is connected to the motor support (20) for supporting the axial plunger pump (2), the oil tank (19) is arranged below the motor support (20), the overflow valve (9) is arranged on a top cover of the oil tank (19), an air filter (3) is arranged in a through hole in the top cover of the oil tank (19), the oil suction pipe (30) is connected to the axial plunger pump (2) and the oil tank (19), the end part of the oil suction pipe (30) is provided with the oil suction filter, the oil tank (19) is provided with an oil return hole (28) arranged below the lowest grade filter (26), the oil return pipe (19) is provided with an oil drain hole (4) arranged at the bottom surface of the bottom of the oil drain hole (4), a partition plate (25) is arranged in the oil tank (19) between the oil suction pipe (30) and the oil return pipe, and the height of the partition plate (25) is higher than the oil level.
3. A hydraulic source device according to claim 2, characterized in that the oil tank (19) is rectangular and is welded from steel plates, and that the side wall of the oil tank (19) is provided with a cleaning window (27).
4. A hydraulic source device according to claim 3, characterized in that the side wall of the tank (19) is fitted with a level gauge.
5. A hydraulic source device according to claim 4, characterized in that the side wall of the tank (19) is provided with a thermometer, a thermostat and a heat exchanger.
6. A hydraulic source device according to claim 5, characterized in that the level gauge (23) and the thermometer are integrally provided in the side wall of the tank.
7. A hydraulic source device according to claim 6, characterized in that the oil tank (19) is provided with lifting lugs (24) on both sides and with feet (29) on the bottom.
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