CN110925246B - Energy-storage regeneration energy-saving mold opening and closing system and mold opening and closing control method - Google Patents
Energy-storage regeneration energy-saving mold opening and closing system and mold opening and closing control method Download PDFInfo
- Publication number
- CN110925246B CN110925246B CN201811103870.6A CN201811103870A CN110925246B CN 110925246 B CN110925246 B CN 110925246B CN 201811103870 A CN201811103870 A CN 201811103870A CN 110925246 B CN110925246 B CN 110925246B
- Authority
- CN
- China
- Prior art keywords
- oil
- way
- valve
- energy
- opening
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
- F15B1/02—Installations or systems with accumulators
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/002—Component parts, details or accessories; Auxiliary operations
-
- 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
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Thermal Sciences (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The invention provides an energy-storage regeneration energy-saving mold opening and closing system which comprises an energy-supply hydraulic circuit, a mold opening and closing hydraulic circuit and an energy-storage hydraulic circuit. When the mould is closed, the hydraulic pump feeds oil to a rod cavity on the mould opening and closing oil cylinder, a main return oil way is closed, and under the combined action of the oil pressure of the upper rod cavity and gravity, the oil in the lower rodless cavity enters the energy accumulator to convert gravitational potential energy into elastic potential energy; when the die is opened, the hydraulic pump does not supply oil, the energy accumulator supplies oil to the lower rodless cavity lifting cross beam, and the elastic potential energy is converted into gravitational potential energy. Thus, the energy-saving effect is achieved by the energy accumulator; the energy accumulator is arranged on the energy storage hydraulic loop, so that the energy accumulator can keep a proper distance with the die opening and closing oil cylinder, the space problem is well solved, and the safety means can be fully configured; the energy storage hydraulic circuit is adopted, so that the elastic potential energy of the energy accumulator can be more conveniently applied to other hydraulic circuits adopting low-pressure operation, and energy conservation and flexibility are considered.
Description
Technical Field
The invention relates to the technical field of hydraulic control of vulcanizing machines, in particular to an energy-storage, regeneration and energy-saving mold opening and closing system and a mold opening and closing control method.
Background
For a general press, the mold opening and closing oil cylinders have a longer stroke and bear a heavier mold, the mold opening and closing is the lifting motion of lifting and lowering, gravitational potential energy is converted into a large amount of heat energy to enter oil return, the energy is obviously wasted, and a large amount of cooling water or air is consumed to maintain a proper oil working temperature, so that the production energy consumption is greatly increased, and the production cost is increased. What is needed is an open-close mold system that can stably convert and utilize gravitational potential energy.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide an energy-storage, regeneration and energy-saving mold opening and closing system and a mold opening and closing control method.
In order to achieve the above purpose, the technical scheme adopted by the invention for solving the technical problems is as follows:
an energy-storage regeneration energy-saving mold opening and closing system comprises an energy-supply hydraulic circuit, a mold opening and closing hydraulic circuit and an energy-storage hydraulic circuit;
the energy supply hydraulic circuit comprises a hydraulic pump, an oil tank, a main oil supply circuit and an oil return circuit, wherein an oil suction port of the hydraulic pump is connected to the oil tank, an oil outlet of the hydraulic pump is connected to the main oil supply circuit, a one-way valve is connected to the main oil supply circuit close to the oil outlet of the hydraulic pump, the main oil supply circuit at the rear side of the one-way valve is connected to the oil return circuit through a first overflow valve, and the oil return circuit is communicated to the oil tank;
the die opening and closing hydraulic loop comprises a three-position four-way proportional valve, a first electromagnetic ball valve, a hydraulic control one-way valve and a die opening and closing oil cylinder; an oil inlet P of the three-position four-way proportional valve is connected to a main oil supply way, an oil return port T of the three-position four-way proportional valve is connected to an oil return way, a working oil port A of the three-position four-way proportional valve is sequentially connected with a first electromagnetic ball valve and a hydraulic control one-way valve through a pipeline and then is finally connected to a lower rodless cavity of an opening and closing die cylinder, and a working oil port B of the three-position four-way proportional valve is connected to an upper rod cavity of the opening and closing die cylinder through a pipeline;
the energy storage hydraulic circuit comprises an energy storage oil way, an energy accumulator and a second overflow valve, the energy accumulator is connected to the energy storage oil way through a pipeline, and the energy storage oil way is connected to the oil tank through the second overflow valve;
the energy storage oil way is connected to an oil way between the first electromagnetic ball valve and the hydraulic control one-way valve of the mold opening and closing hydraulic circuit through a pipeline and the second electromagnetic ball valve.
Compared with the prior art, the hydraulic pump supplies oil to the rod cavity on the opening and closing oil cylinder during mold closing by utilizing the energy storage and release functions of the energy storage device, the main oil return oil way is closed, the lower rodless cavity oil enters the energy storage device through the energy storage oil way under the combined action of the oil pressure of the upper rod cavity and gravity, the gravitational potential energy is converted into elastic potential energy, and the pressure of the energy storage device is increased; when the die is opened, the hydraulic pump does not supply oil, the energy accumulator supplies oil to the lower rodless cavity lifting cross beam, the elastic potential energy is converted into gravitational potential energy, and the pressure of the energy accumulator is reduced. Thus, the energy-saving effect is achieved by the energy accumulator; because the die opening and closing oil cylinder is longer, the number of the needed energy accumulators is more, and the energy accumulators are arranged on the energy accumulation hydraulic loop, so that the energy accumulators can keep a proper distance with the die opening and closing oil cylinder, the space problem is well solved, and the safety means can be fully configured; the energy storage hydraulic circuit is adopted, so that the elastic potential energy of the energy accumulator can be more conveniently applied to other hydraulic circuits adopting low-pressure operation, and energy conservation and flexibility are considered.
Further, a control oil path of the hydraulic pump is connected with a three-position four-way electromagnetic valve, a third overflow valve and a fourth overflow valve, an oil inlet P of the three-position four-way electromagnetic valve is connected to a pressure control port of the hydraulic pump, an oil return port T of the three-position four-way electromagnetic valve is connected to an oil return oil path, a working oil port A of the three-position four-way electromagnetic valve is connected to the oil return oil path through the third overflow valve, and a working oil port B of the three-position four-way electromagnetic valve is connected to the oil return oil path through the fourth overflow valve.
Further, the opening pressure of the first overflow valve, the second overflow valve, the third overflow valve and the fourth overflow valve are in the following magnitude relation: the first overflow valve is larger than the third overflow valve, the second overflow valve is larger than the fourth overflow valve.
By adopting the preferable scheme, the area difference of the upper rod cavity and the lower rodless cavity of the die opening and closing oil cylinder is considered, the energy supply hydraulic circuit is provided with two-stage system pressure, the opening pressure of the third overflow valve and the fourth overflow valve is the two-stage system pressure, and the control selection is carried out through the three-position four-way electromagnetic valve.
Further, the energy storage oil way is connected to a main oil supply oil way of the energy supply hydraulic circuit through a pipeline and a third electromagnetic ball valve; the energy storage oil path is provided with a pressure sensor and further comprises a fourth electromagnetic ball valve, the fourth electromagnetic ball valve is connected with the second overflow valve in parallel on the energy storage oil path, and the fourth electromagnetic ball valve is a normally open electromagnetic ball valve.
By adopting the preferable scheme, the pressure sensor is used for automatically controlling the pressure compensation and pressure release of the energy accumulator, so that the energy accumulator maintains constant pressure after die assembly. When the pressure of the energy accumulator is lower than the set pressure before the die opening, the pressure of the energy accumulator is complemented by a hydraulic pump through opening a third electromagnetic ball valve; when the pressure of the accumulator is higher than the set pressure after the die is assembled, the fourth electromagnetic ball valve is opened to release pressure, and the higher pressure can overflow through the second overflow valve.
Further, the device also comprises a displacement sensor for detecting the mold opening and closing position, the mold opening and closing speed is regulated and controlled by regulating the opening proportion of the three-position four-way proportional valve, the mold opening stroke is divided into a lower-section low-speed mold opening stroke, a middle-section high-speed mold opening stroke and an upper-section low-speed mold opening stroke, and the mold closing stroke is divided into an upper-section high-speed mold closing stroke, a middle-section medium-speed mold closing stroke and a lower-section low-speed mold closing stroke.
By adopting the preferable scheme, the high speed and the low speed are organically combined, so that the mold opening and closing speed is improved, and the mold opening and closing stability is ensured.
The hydraulic control system comprises a hydraulic control system, a hydraulic control system and a hydraulic control system, and is characterized by further comprising a pressure relief hydraulic circuit, wherein the pressure relief hydraulic circuit comprises a three-position four-way electromagnetic valve, a hydraulic control one-way valve, a fifth overflow valve and a pressure relief oil cylinder, an oil inlet P of the three-position four-way electromagnetic valve is connected with a main oil supply oil way, an oil return port T of the three-position four-way electromagnetic valve is connected with an oil return oil way, a working oil port A of the three-position four-way electromagnetic valve is connected to an upper oil cavity of the pressure relief oil cylinder through the hydraulic control one-way valve, an oil return oil way is connected to an oil way through the fifth overflow valve on an oil way between the hydraulic control one-way valve and the upper oil cavity of the pressure relief oil cylinder, a working oil port B of the three-position four-way electromagnetic valve is connected to a lower oil cavity of the pressure relief oil cylinder, and a hydraulic control port B of the hydraulic control one-way valve is connected to an oil way between the working oil port B and the lower oil cavity of the pressure relief oil cylinder.
By adopting the preferable scheme, the pressure relief cylinder of the pressure relief hydraulic circuit is used for providing stable mold clamping force for the mold, so that the tire vulcanization quality is improved.
A mold opening and closing control method adopts the energy-storage regeneration energy-saving mold opening and closing system,
the die assembly process comprises the steps of high-speed die assembly and energy storage: the hydraulic pump feeds oil, an electromagnet YV10B of a three-position four-way proportional valve in the open-close die hydraulic circuit is powered on, the right side of the three-position four-way proportional valve is opened, the opening is set to 100%, a first electromagnetic ball valve is closed, a second electromagnetic ball valve is opened, hydraulic oil of a rodless cavity below the open-close die hydraulic cylinder enters an energy storage hydraulic circuit, and the pressure of an energy accumulator is increased for energy storage;
the die opening process comprises the steps of high-speed die opening and energy releasing: the hydraulic pump does not feed oil, an electromagnet YV10A of a three-position four-way proportional valve in the open-close die hydraulic circuit is powered on, the left side of the three-position four-way proportional valve is opened, the opening is set to 100%, a first electromagnetic ball valve is closed, a second electromagnetic ball valve is opened, an accumulator supplies oil to a lower rodless cavity of the open-close die oil cylinder to lift a cross beam, and the pressure of the accumulator is reduced to release energy.
By adopting the preferable scheme, the energy-saving effect is achieved by the energy accumulator while the mold is opened and closed rapidly.
Further, after the die assembly is completed, the pressure in the energy storage oil path is detected by the pressure sensor,
when the pressure is smaller than the set pressure, performing energy storage and pressure compensation step before die opening: the electromagnet DT1B of the three-position four-way electromagnetic valve of the control oil circuit of the hydraulic pump is powered on, the main oil supply oil circuit provides low pressure, the third electromagnetic ball valve is opened, the main oil supply oil circuit supplies oil to the energy storage oil circuit, the pressure of the energy storage device rises to store energy, and when the energy storage oil circuit reaches the set pressure, the third electromagnetic ball valve and the electromagnet DT1B are closed;
when the pressure is greater than the set pressure, performing energy storage and pressure relief steps: and the fourth electromagnetic ball valve is disconnected, hydraulic oil in the energy storage oil way returns to the oil tank through the normally open fourth electromagnetic ball valve, and when the energy storage oil way reaches the set pressure, the fourth electromagnetic ball valve is started to block oil return of the energy storage oil way.
By adopting the preferable scheme, the pressure sensor is used for automatically controlling the pressure compensation and pressure release of the energy accumulator, so that the energy accumulator maintains constant pressure after die assembly, and the sufficient flow and stable speed before die opening next time are ensured.
Further, the position of the mold opening and closing is detected by a displacement sensor, and the mold opening and closing is performed in a sectional manner:
when the mold is closed,
the high-speed die assembly stroke of the upper section is completed through a high-speed die assembly energy storage step;
in the middle-section medium-speed die closing stroke, an electromagnet DT1A of a three-position four-way electromagnetic valve of a control oil way of a hydraulic pump is powered on, a main oil supply oil way provides high pressure, an electromagnet YV10B of a three-position four-way proportional valve in a die opening and closing hydraulic circuit is powered on, the right side of the three-position four-way proportional valve is opened, the opening is set to 53%, a first electromagnetic ball valve is opened, a second electromagnetic ball valve is closed, and a rod cavity on a die opening and closing oil cylinder acts on a die at full pressure;
in the lower section low-speed die closing stroke, an electromagnet DT1A of a three-position four-way electromagnetic valve of a control oil way of a hydraulic pump is powered on, a main oil supply oil way provides high pressure, an electromagnet YV10B of a three-position four-way proportional valve in a die opening and closing hydraulic circuit is powered on, the right side of the three-position four-way proportional valve is opened, the opening is set to 30%, a first electromagnetic ball valve is opened, a second electromagnetic ball valve is closed, and a rod cavity on a die opening and closing oil cylinder acts on a die at full pressure;
when the mould is opened,
in the lower section low-speed die opening stroke, an electromagnet DT1A of a three-position four-way electromagnetic valve of a control oil way of a hydraulic pump is powered on, a main oil supply oil way provides high pressure, an electromagnet YV10A of a three-position four-way proportional valve in a die opening and closing hydraulic circuit is powered on, the left side of the three-position four-way proportional valve is opened, the opening is set to 35%, a first electromagnetic ball valve is opened, a second electromagnetic ball valve is closed, and high-pressure oil of the main oil supply oil way enters a rodless cavity below a die opening and closing oil cylinder;
the middle section high-speed die-opening stroke is completed through the high-speed die-opening energy-releasing step;
in the upper section low-speed die opening stroke, an electromagnet DT1A of a three-position four-way electromagnetic valve of a control oil way of a hydraulic pump is powered on, a main oil supply oil way provides high pressure, an electromagnet YV10A of a three-position four-way proportional valve in a die opening and closing hydraulic circuit is powered on, the left side of the three-position four-way proportional valve is opened, the opening degree is set to 30%, a first electromagnetic ball valve is opened, a second electromagnetic ball valve is closed, and high-pressure oil of the main oil supply oil way enters a rodless cavity below a die opening and closing oil cylinder.
By adopting the preferable scheme, the high speed and the low speed are organically combined, so that the mold opening and closing speed is improved, and the mold opening and closing stability is ensured.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an embodiment of the present invention;
FIG. 2 is an enlarged view of a portion of the frame A powered hydraulic circuit of FIG. 1;
FIG. 3 is an enlarged view of a portion of the B-frame mold opening and closing hydraulic circuit of FIG. 1;
FIG. 4 is an enlarged view of a portion of the C-frame charge hydraulic circuit of FIG. 1;
FIG. 5 is an enlarged view of a portion of the D-box plus pressure relief hydraulic circuit of FIG. 1;
fig. 6 is a schematic structural view of a segmented mold opening and closing embodiment of the present invention.
Names of the corresponding parts indicated by numerals and letters in the drawings:
11-a hydraulic pump; 12-an oil tank; 13-a one-way valve; 14-a first overflow valve; 15-three-position four-way electromagnetic valve; 16-a third overflow valve; 17-fourth overflow valve; 18-a cooling water switch; 21-three-position four-way proportional valve; 22-a first electromagnetic ball valve; 23-a hydraulically-controlled check valve; 24-opening and closing the die cylinder; 31-an accumulator; 32-a second overflow valve; 33-a second electromagnetic ball valve; 34-a third electromagnetic ball valve; 35-fourth electromagnetic ball valve; 36-a pressure sensor; 41-three-position four-way electromagnetic valve; 42-a hydraulically-controlled check valve; 43-a fifth overflow valve; 44-adding a pressure relief oil cylinder.
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. 1-4, an energy-storage regeneration energy-saving mold opening and closing system comprises an energy-supply hydraulic circuit, a mold opening and closing hydraulic circuit and an energy-storage hydraulic circuit;
the energy supply hydraulic circuit comprises a hydraulic pump 11, an oil tank 12, a main oil supply circuit P and an oil return circuit T, wherein an oil suction port of the hydraulic pump 11 is connected to the oil tank 12, an oil outlet of the hydraulic pump 11 is connected to the main oil supply circuit P, a one-way valve 13 is connected to the main oil supply circuit P near the oil outlet of the hydraulic pump 11, the main oil supply circuit P at the rear side of the one-way valve 13 is connected to the oil return circuit T through a first overflow valve 14, and the oil return circuit T is communicated to the oil tank 12;
the die opening and closing hydraulic circuit comprises a three-position four-way proportional valve 21, a first electromagnetic ball valve 22, a hydraulic control one-way valve 23 and a die opening and closing oil cylinder 24; an oil inlet P of the three-position four-way proportional valve 21 is connected to a main oil supply way, an oil return port T of the three-position four-way proportional valve 21 is connected to an oil return way T, a working oil port A of the three-position four-way proportional valve 21 is sequentially connected with a first electromagnetic ball valve 22 and a hydraulic control one-way valve 23 through pipelines and then is finally connected to a lower rodless cavity of the mold opening and closing oil cylinder 24, and a working oil port B of the three-position four-way proportional valve 21 is connected to an upper rod cavity of the mold opening and closing oil cylinder 24 through pipelines;
the energy storage hydraulic circuit comprises an energy storage oil circuit AC, an energy storage device 31 and a second overflow valve 32, wherein the energy storage device 31 is connected to the energy storage oil circuit AC through a pipeline, and the energy storage oil circuit AC is connected to the oil tank 12 through the second overflow valve 32;
the energy storage oil path AC is connected to an oil path between the first electromagnetic ball valve 22 and the hydraulic control one-way valve 23 of the mold opening and closing hydraulic circuit through a second electromagnetic ball valve 33 by a pipeline.
The beneficial effects of adopting above-mentioned technical scheme are: when the die is closed, the hydraulic pump 11 supplies oil to a rod cavity on the die opening and closing oil cylinder 24, a main return oil path P is closed, and under the combined action of the oil pressure of the upper rod cavity and gravity, the oil in the lower rodless cavity enters the accumulator 31 through an energy storage oil path AC, so that gravitational potential energy is converted into elastic potential energy, and the pressure of the accumulator 31 is increased; when the die is opened, the hydraulic pump 11 does not supply oil, the accumulator 31 supplies oil to the lower rodless cavity lifting beam, the elastic potential energy is converted into gravitational potential energy, and the pressure of the accumulator 31 is reduced. Thus, the energy-saving effect is achieved by the energy accumulator 31; because the mold opening and closing oil cylinder 24 is longer, the number of the needed energy accumulators 31 is more, and the energy accumulators 31 are arranged on the energy storage hydraulic loop, so that a proper distance can be kept between the energy accumulators 31 and the mold opening and closing oil cylinder 24, the space problem is well solved, and the safety means can be fully configured; the energy storage hydraulic circuit is adopted, so that the elastic potential energy of the energy accumulator can be more conveniently applied to other hydraulic circuits adopting low-pressure operation, and energy conservation and flexibility are considered.
As shown in fig. 2, in other embodiments of the present invention, a control oil path of the hydraulic pump 11 is connected with a three-position four-way solenoid valve 15, a third overflow valve 16 and a fourth overflow valve 17, an oil inlet P of the three-position four-way solenoid valve 15 is connected to a pressure control port of the hydraulic pump 11, an oil return port T of the three-position four-way solenoid valve 15 is connected to an oil return oil path T, an operating port a of the three-position four-way solenoid valve 15 is connected to the oil return oil path T via the third overflow valve 16, and an operating port B of the three-position four-way solenoid valve 15 is connected to the oil return oil path T via the fourth overflow valve 17. The opening pressures of the first relief valve 14, the second relief valve 32, the third relief valve 16 and the fourth relief valve 17 are in the relationship: the first overflow valve is larger than the third overflow valve, the second overflow valve is larger than the fourth overflow valve. In an embodiment of the mold opening and closing system of the vulcanizing machine, the opening pressures of the first overflow valve 14, the second overflow valve 32, the third overflow valve 16 and the fourth overflow valve 17 are set to 12.5MPa, 9MPa, 12MPa, 8MPa in this order. The beneficial effects of adopting above-mentioned technical scheme are: considering the area difference of a rod cavity and a lower rodless cavity on the die opening and closing oil cylinder, the energy supply hydraulic circuit is provided with two-stage system pressure, the opening pressure of the third overflow valve 16 and the fourth overflow valve 17 is the two-stage system pressure, and the control selection is carried out through the three-position four-way electromagnetic valve 15.
In other embodiments of the invention, as shown in fig. 2-4, the charge circuit AC is also connected by piping to the main supply circuit P of the charge hydraulic circuit via a third solenoid valve 34; the energy storage oil way AC is provided with a pressure sensor 36 and further comprises a fourth electromagnetic ball valve 35, the fourth electromagnetic ball valve 35 is connected with the second overflow valve 32 in parallel on the energy storage oil way AC, and the fourth electromagnetic ball valve 35 is a normally open electromagnetic ball valve. The beneficial effects of adopting above-mentioned technical scheme are: the pressure sensor 36 is used for automatically controlling the pressure compensation and pressure release of the accumulator 31, so that the accumulator 31 maintains constant pressure after the die assembly. When the pressure of the accumulator is lower than the set pressure before the die opening, the pressure of the accumulator 31 is complemented by the hydraulic pump 11 through opening the third electromagnetic ball valve 34; when the accumulator pressure is higher than the set pressure after the die assembly, the fourth electromagnetic ball valve 35 is opened to release the pressure, and the higher pressure can overflow through the second overflow valve 32.
As shown in fig. 6, in other embodiments of the present invention, a displacement sensor for detecting the position of the mold opening and closing is further included, and the mold opening and closing speed is regulated by adjusting the opening ratio of the three-position four-way proportional valve 21, and the mold opening stroke is divided into a lower section low-speed mold opening stroke, a middle section high-speed mold opening stroke and an upper section low-speed mold opening stroke, and the mold closing stroke is divided into an upper section high-speed mold closing stroke, a middle section medium-speed mold closing stroke and a lower section low-speed mold closing stroke. The beneficial effects of adopting above-mentioned technical scheme are: the high-speed and low-speed organic combination not only improves the mold opening and closing speed, but also ensures the stability of mold opening and closing.
In other embodiments of the present invention, as shown in fig. 2, a cooling water device is disposed on the return oil path T of the energy supply hydraulic circuit, and a cooling water switch 18 of the cooling water device controls whether to cool the oil in the return oil path according to the oil temperature detected by the temperature sensor on the oil tank 12.
As shown in fig. 5, in other embodiments of the present invention, the pressure-relief hydraulic circuit further includes a three-position four-way solenoid valve 41, a pilot-operated check valve 42, a fifth relief valve 43 and a pressure-relief oil cylinder 44, an oil inlet P of the three-position four-way solenoid valve 41 is connected to a main oil supply path P, an oil return port T of the three-position four-way solenoid valve 41 is connected to an upper oil chamber of the pressure-relief oil cylinder 44 via the pilot-operated check valve 42, an oil path between the pilot-operated check valve 42 and the upper oil chamber of the pressure-relief oil cylinder 44 is connected to an oil return path T via the fifth relief valve 43, an oil port B of the three-position four-way solenoid valve 41 is connected to a lower oil chamber of the pressure-relief oil cylinder 44, and a pilot-operated port of the pilot-operated check valve 42 is connected to an oil path between the oil port B and the lower oil chamber of the pressure-relief oil cylinder 44. The beneficial effects of adopting above-mentioned technical scheme are: the mold is provided with stable mold clamping force through the pressure adding and relieving oil cylinder 44 of the pressure adding and relieving hydraulic circuit, and the tire vulcanization quality is improved.
The following table is a table of electromagnet numbers in each hydraulic component in one embodiment of the mold opening and closing system:
the following table is a table of the operating states of the electromagnets in each hydraulic element in one embodiment of the mold opening and closing system:
a method for controlling the opening and closing of a mold,
the die assembly process comprises the steps of high-speed die assembly and energy storage: the hydraulic pump 11 supplies oil, an electromagnet YV10B of a three-position four-way proportional valve 21 in the mold opening and closing hydraulic circuit is powered on, the right side of the three-position four-way proportional valve 21 is opened, the opening is set to 100%, a first electromagnetic ball valve 22 is closed, a second electromagnetic ball valve 33 is opened, hydraulic oil of a rodless cavity below a mold opening and closing hydraulic cylinder 24 enters an energy storage hydraulic circuit, and the pressure of an energy accumulator 31 rises to store energy;
the die opening process comprises the steps of high-speed die opening and energy releasing: the hydraulic pump 11 does not supply oil, the electromagnet YV10A of the three-position four-way proportional valve 21 in the mold opening and closing hydraulic circuit is powered on, the left side of the three-position four-way proportional valve 21 is opened, the opening is set to 100%, the first electromagnetic ball valve 22 is closed, the second electromagnetic ball valve 33 is opened, the accumulator 31 supplies oil to the lower rodless cavity of the mold opening and closing hydraulic cylinder 24 to lift the cross beam, and the pressure of the accumulator 31 is reduced to release energy.
The beneficial effects of adopting above-mentioned technical scheme are: the energy-saving effect is achieved by means of the energy accumulator while the mold is opened and closed quickly.
In other embodiments of the present invention, after the mold is closed, the pressure in the accumulator circuit is sensed by the pressure sensor 36,
when the pressure is smaller than the set pressure, performing energy storage and pressure compensation step before die opening: the electromagnet DT1B of the three-position four-way solenoid valve 15 of the control oil circuit of the hydraulic pump is powered on, the main oil supply oil circuit P provides low pressure, the third electromagnetic ball valve 34 is opened, the main oil supply oil circuit P supplies oil to the energy storage oil circuit AC, the pressure of the energy storage device 31 rises to store energy, and when the energy storage oil circuit AC reaches the set pressure, the third electromagnetic ball valve 34 and the electromagnet DT1B are closed;
when the pressure is greater than the set pressure, performing energy storage and pressure relief steps: the fourth electromagnetic ball valve 35 is disconnected, hydraulic oil in the energy storage oil way AC returns to the oil tank 12 through the fourth electromagnetic ball valve 35 which is normally open, and when the energy storage oil way AC reaches the set pressure, the fourth electromagnetic ball valve 35 is opened to block oil return of the energy storage oil way. The beneficial effects of adopting above-mentioned technical scheme are: the pressure sensor 36 is used for automatically controlling the pressure compensation and pressure release of the accumulator, so that the accumulator 31 maintains constant pressure after die assembly, and ensures sufficient flow and stable speed before die opening next time.
In other embodiments of the present invention, the position of the mold opening/closing is detected by a displacement sensor, and the mold opening/closing is performed in a sectional manner:
when the mold is closed,
the upper section high-speed die assembly stroke is completed through the high-speed die assembly energy storage step, and the energy storage device 31 stores energy;
in the middle-stage middle-speed die closing stroke, the electromagnet DT1A of the three-position four-way electromagnetic valve 15 of the control oil way of the hydraulic pump is powered on, the main oil supply oil way P provides high pressure, the electromagnet YV10B of the three-position four-way proportional valve 21 in the die opening and closing hydraulic circuit is powered on, the right side of the three-position four-way proportional valve 21 is opened, the opening is set to 53%, the first electromagnetic ball valve 22 is opened, the second electromagnetic ball valve 33 is closed, and a rod cavity on the die opening and closing hydraulic cylinder 24 acts on a die at full pressure;
in the lower section low-speed die closing stroke, the electromagnet DT1A of the three-position four-way electromagnetic valve 15 of the control oil way of the hydraulic pump is powered on, the main oil supply oil way P provides high pressure, the electromagnet YV10B of the three-position four-way proportional valve 21 in the die opening and closing hydraulic circuit is powered on, the right side of the three-position four-way proportional valve 21 is opened, the opening is set to 30%, the first electromagnetic ball valve 22 is opened, the second electromagnetic ball valve 33 is closed, and a rod cavity on the die opening and closing hydraulic cylinder 24 acts on the die at full pressure;
when the mould is opened,
in the lower section low-speed die opening stroke, the electromagnet DT1A of the three-position four-way electromagnetic valve 15 of the control oil way of the hydraulic pump is powered on, the main oil supply oil way P provides high pressure, the electromagnet YV10A of the three-position four-way proportional valve 21 in the die opening and closing hydraulic circuit is powered on, the left side of the three-position four-way proportional valve 21 is opened, the opening is set to 35%, the first electromagnetic ball valve 22 is opened, the second electromagnetic ball valve 33 is closed, and the high pressure oil of the main oil supply oil way P enters a rodless cavity below the die opening and closing oil cylinder 24;
the middle section high-speed die-opening stroke is completed through the high-speed die-opening energy-releasing step, and the energy accumulator 31 releases energy;
in the upper section low-speed die opening stroke, the electromagnet DT1A of the three-position four-way electromagnetic valve 15 of the control oil way of the hydraulic pump 11 is powered on, the main oil supply oil way P provides high pressure, the electromagnet YV10A of the three-position four-way proportional valve 21 in the die opening and closing hydraulic circuit is powered on, the left side of the three-position four-way proportional valve 21 is opened, the opening degree is set to 30%, the first electromagnetic ball valve 22 is opened, the second electromagnetic ball valve 33 is closed, and the main oil supply oil way P enters a rodless cavity under the die opening and closing oil cylinder 24. The beneficial effects of adopting above-mentioned technical scheme are: the high-speed and low-speed organic combination not only improves the mold opening and closing speed, but also ensures the stability of mold opening and closing.
The energy-saving effect comparison of the mold opening and closing system and the common system is carried out according to specific data:
when the die is hung:
let the actual beam and the die gravity load equivalent pressure pg=4.1 MPa,
the opening and closing speeds are the same, the resistance drop of the pipe and the valve is the same, the R=2.0 MPa,
the area ratio lambda=2 of the open-close die cylinder is set, the area A of the lower cavity is set,
lower cavity pressure px=pg+r when die opening,
setting the system pressure as Pe,
let the die opening and closing idle stroke be l=1.5m,
1. common system
The upper cavity pressure Psp during mold closing,
opening the mould to apply work (Pg+R) A L,
the die is assembled to apply work PspAL/lambda,
total work wp= (pg+r+psp/λ) × al.
2. Energy-saving system
Upper cavity pressure Psj at the time of closing the mold,
the die is opened to apply work (Pg+R) A L, the accumulator supplies oil, the oil pump does not work, and the work meter is zero;
die closing work Psj XA/lambda=2RXA,
total work wj=0+wh=2r×a×l.
3. Energy saving ratio:
η＝(Wp-Wj)/Wp＝(Pg-R+Psp/λ)/(Pg+R+Psp/λ)
＝(4.1-2+Psp/2)/(4.1+2+Psp/2)
＝(2.1+Psp/2)/(6.1+Psp/2)。
3.1 when a common system adopts a balance valve with 3:1 pilot ratio, the set pressure is 1.5 times of the maximum load, the upper cavity pressure Psp can be as small as 3MPa,
η＝(2.1+3/2)/(6.1+3/2)＝37％。
3.2 when the regulating pressure of the common system balance valve is higher and the loop resistance is larger, the upper cavity pressure Psp is close to the system pressure of 12MPa,
η＝(2.1+12/2)/(6.1+12/2)＝67％。
(II) when the die is not hung:
the beam equivalent pressure pg=2.2 MPa,
the Psp is about 9MPa and the pressure of the product,
psj is about 12MPa and is about,
η＝(Pg-R+Psp/λ)/(Pg+R+Psp/λ)
＝2.2-2+9/2)/(2.2+2+9/2)＝31％。
compared with the common system, the energy storage regeneration system has obvious energy saving effect, obviously reduces the consumption of cooling medium, and is especially suitable for large-stroke presses such as tire vulcanizers, metal cold presses and the like.
The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement the same, but not limit the scope of the present invention, and all equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of the present invention.
Claims (2)
1. The energy-saving and energy-saving mold opening and closing control method is characterized in that an energy-saving and energy-saving mold opening and closing system is adopted for control, and the energy-saving and energy-saving mold opening and closing system comprises: an energy supply hydraulic circuit, an opening and closing die hydraulic circuit and an energy storage hydraulic circuit;
the energy supply hydraulic circuit comprises a hydraulic pump, an oil tank, a main oil supply circuit and an oil return circuit, wherein an oil suction port of the hydraulic pump is connected to the oil tank, an oil outlet of the hydraulic pump is connected to the main oil supply circuit, a one-way valve is connected to the main oil supply circuit close to the oil outlet of the hydraulic pump, the main oil supply circuit at the rear side of the one-way valve is connected to the oil return circuit through a first overflow valve, and the oil return circuit is communicated to the oil tank;
the die opening and closing hydraulic loop comprises a three-position four-way proportional valve, a first electromagnetic ball valve, a hydraulic control one-way valve and a die opening and closing oil cylinder; an oil inlet P of the three-position four-way proportional valve is connected to a main oil supply way, an oil return port T of the three-position four-way proportional valve is connected to an oil return way, a working oil port A of the three-position four-way proportional valve is sequentially connected with a first electromagnetic ball valve and a hydraulic control one-way valve through a pipeline and then is finally connected to a lower rodless cavity of an opening and closing die cylinder, and a working oil port B of the three-position four-way proportional valve is connected to an upper rod cavity of the opening and closing die cylinder through a pipeline;
the energy storage hydraulic circuit comprises an energy storage oil way, an energy accumulator and a second overflow valve, the energy accumulator is connected to the energy storage oil way through a pipeline, and the energy storage oil way is connected to the oil tank through the second overflow valve;
the energy storage oil way is connected to an oil way between the first electromagnetic ball valve and the hydraulic control one-way valve of the mold opening and closing hydraulic circuit through a pipeline and a second electromagnetic ball valve;
the hydraulic pump control oil path is connected with a three-position four-way electromagnetic valve, a third overflow valve and a fourth overflow valve, an oil inlet P of the three-position four-way electromagnetic valve is connected to a pressure control port of the hydraulic pump, an oil return port T of the three-position four-way electromagnetic valve is connected to an oil return oil path, a working oil port A of the three-position four-way electromagnetic valve is connected to the oil return oil path through the third overflow valve, and a working oil port B of the three-position four-way electromagnetic valve is connected to the oil return oil path through the fourth overflow valve;
the opening pressure magnitude relation of the first overflow valve, the second overflow valve, the third overflow valve and the fourth overflow valve is as follows: the first overflow valve > the third overflow valve > the second overflow valve > the fourth overflow valve;
the energy storage oil way is also connected to a main oil supply oil way of the energy supply hydraulic circuit through a pipeline and a third electromagnetic ball valve; the energy storage oil path is provided with a pressure sensor and further comprises a fourth electromagnetic ball valve, the fourth electromagnetic ball valve is connected with the second overflow valve in parallel on the energy storage oil path, and the fourth electromagnetic ball valve is a normally open electromagnetic ball valve;
the mold opening and closing speed is regulated and controlled by regulating the opening proportion of the three-position four-way proportional valve, the mold opening stroke is divided into a lower-section low-speed mold opening stroke, a middle-section high-speed mold opening stroke and an upper-section low-speed mold opening stroke, and the mold closing stroke is divided into an upper-section high-speed mold closing stroke, a middle-section medium-speed mold closing stroke and a lower-section low-speed mold closing stroke;
the die assembly process comprises the steps of high-speed die assembly and energy storage: the hydraulic pump feeds oil, an electromagnet YV10B of a three-position four-way proportional valve in the open-close die hydraulic circuit is powered on, the right side of the three-position four-way proportional valve is opened, the opening is set to 100%, a first electromagnetic ball valve is closed, a second electromagnetic ball valve is opened, hydraulic oil of a rodless cavity below the open-close die hydraulic cylinder enters an energy storage hydraulic circuit, and the pressure of an energy accumulator is increased for energy storage;
the die opening process comprises the steps of high-speed die opening and energy releasing: the hydraulic pump does not supply oil, an electromagnet YV10A of a three-position four-way proportional valve in the open-close die hydraulic circuit is powered on, the left side of the three-position four-way proportional valve is opened, the opening is set to 100%, a first electromagnetic ball valve is opened, a second electromagnetic ball valve is closed, an accumulator supplies oil to a lower rodless cavity of the open-close die oil cylinder to lift a cross beam, and the pressure of the accumulator is reduced to release energy;
after the die assembly is completed, the pressure in the energy storage oil way is detected by the pressure sensor,
when the pressure is smaller than the set pressure, performing energy storage and pressure compensation step before die opening: the electromagnet DT1B of the three-position four-way electromagnetic valve of the control oil way of the hydraulic pump is powered on, the three-position four-way electromagnetic valve of the control oil way of the hydraulic pump works on the right side, at the moment, the oil inlet P of the three-position four-way electromagnetic valve of the control oil way of the hydraulic pump is communicated with the working oil port B, the main oil supply oil way provides low pressure, the third electromagnetic ball valve is opened, the main oil supply oil way supplies oil to the energy storage oil way, the pressure of the energy storage device rises to store energy, and when the energy storage oil way reaches the set pressure, the third electromagnetic ball valve and the electromagnet DT1B are closed;
when the pressure is greater than the set pressure, performing energy storage and pressure relief steps: the fourth electromagnetic ball valve is disconnected, hydraulic oil in the energy storage oil way returns to the oil tank through the normally open fourth electromagnetic ball valve, and when the energy storage oil way reaches the set pressure, the fourth electromagnetic ball valve is started to block oil return of the energy storage oil way;
detecting the position of the opening and closing die through a displacement sensor, and executing sectional opening and closing die:
when the mold is closed,
the high-speed die assembly stroke of the upper section is completed through a high-speed die assembly energy storage step;
in the middle-stage medium-speed die closing stroke, an electromagnet DT1A of a three-position four-way electromagnetic valve of a control oil way of a hydraulic pump is powered on, the three-position four-way electromagnetic valve of the control oil way of the hydraulic pump works at the left side, at the moment, an oil inlet P of the three-position four-way electromagnetic valve of the control oil way of the hydraulic pump is communicated with a working oil port A, a main oil supply oil way provides high pressure, an electromagnet YV10B of a three-position four-way proportional valve in a die opening and closing hydraulic circuit is powered on, the right side of the three-position four-way proportional valve is opened, the opening of the electromagnet is set to 53%, a first electromagnetic ball valve is opened, a second electromagnetic ball valve is closed, and a rod cavity on a die opening and closing cylinder acts on a die at full pressure;
in the lower section low-speed die closing stroke, an electromagnet DT1A of a three-position four-way electromagnetic valve of a control oil way of a hydraulic pump is powered on, a main oil supply oil way provides high pressure, an electromagnet YV10B of a three-position four-way proportional valve in a die opening and closing hydraulic circuit is powered on, the right side of the three-position four-way proportional valve is opened, the opening is set to 30%, a first electromagnetic ball valve is opened, a second electromagnetic ball valve is closed, and a rod cavity on a die opening and closing oil cylinder acts on a die at full pressure;
when the mould is opened,
in the lower section low-speed die opening stroke, an electromagnet DT1A of a three-position four-way electromagnetic valve of a control oil way of a hydraulic pump is powered on, a main oil supply oil way provides high pressure, an electromagnet YV10A of a three-position four-way proportional valve in a die opening and closing hydraulic circuit is powered on, the left side of the three-position four-way proportional valve is opened, the opening is set to 35%, a first electromagnetic ball valve is opened, a second electromagnetic ball valve is closed, and high-pressure oil of the main oil supply oil way enters a rodless cavity below a die opening and closing oil cylinder;
the middle section high-speed die-opening stroke is completed through the high-speed die-opening energy-releasing step;
in the upper section low-speed die opening stroke, an electromagnet DT1A of a three-position four-way electromagnetic valve of a control oil way of a hydraulic pump is powered on, a main oil supply oil way provides high pressure, an electromagnet YV10A of a three-position four-way proportional valve in a die opening and closing hydraulic circuit is powered on, the left side of the three-position four-way proportional valve is opened, the opening degree is set to 30%, a first electromagnetic ball valve is opened, a second electromagnetic ball valve is closed, and high-pressure oil of the main oil supply oil way enters a rodless cavity below a die opening and closing oil cylinder.
2. The method for controlling the opening and closing of the die according to claim 1, wherein the energy storage regeneration energy-saving opening and closing system further comprises an adding and releasing hydraulic circuit, the adding and releasing hydraulic circuit comprises a three-position four-way electromagnetic valve, a hydraulic control one-way valve, a fifth overflow valve and an adding and releasing oil cylinder, an oil inlet P of the three-position four-way electromagnetic valve of the adding and releasing hydraulic circuit is connected with a main oil supply oil way, an oil return port T of the three-position four-way electromagnetic valve of the adding and releasing hydraulic circuit is connected with an oil return oil way, an operating port A of the three-position four-way electromagnetic valve of the adding and releasing hydraulic circuit is connected to an upper oil cavity of the adding and releasing oil cylinder through the hydraulic control one-way valve of the adding and releasing hydraulic circuit, an operating port B of the three-position four-way electromagnetic valve of the adding and releasing hydraulic circuit is connected to an oil return oil way between the operating port B of the three-position electromagnetic valve of the adding and the upper oil cavity of the adding and releasing oil cylinder through the fifth overflow valve, and a hydraulic control one-way valve of the adding and releasing hydraulic circuit is connected to a lower oil cavity of the adding and releasing oil cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811103870.6A CN110925246B (en) | 2018-09-20 | 2018-09-20 | Energy-storage regeneration energy-saving mold opening and closing system and mold opening and closing control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811103870.6A CN110925246B (en) | 2018-09-20 | 2018-09-20 | Energy-storage regeneration energy-saving mold opening and closing system and mold opening and closing control method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110925246A CN110925246A (en) | 2020-03-27 |
| CN110925246B true CN110925246B (en) | 2023-10-20 |
Family
ID=69856420
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811103870.6A Active CN110925246B (en) | 2018-09-20 | 2018-09-20 | Energy-storage regeneration energy-saving mold opening and closing system and mold opening and closing control method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110925246B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010131641A (en) * | 2008-12-05 | 2010-06-17 | Toshiba Mach Co Ltd | Injection device for molding machine |
| CN104029366A (en) * | 2014-06-12 | 2014-09-10 | 浙江大学 | Energy-saving hydraulic control device of hydraulic injection molding machine |
| CN104271331A (en) * | 2012-02-13 | 2015-01-07 | 赫斯基注塑***有限公司 | Flow of hydraulic fluid from accumulator assembly and from pump assembly to actuator where higher flow is required |
| CN106015124A (en) * | 2016-07-22 | 2016-10-12 | 中聚信海洋工程装备有限公司 | Hydraumatic fast forging machine set capable of being supplied with pressure superimposedly by hydraulic pumps and high pressure accumulator |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102005017878B3 (en) * | 2005-04-19 | 2006-09-28 | Krauss-Maffei Kunststofftechnik Gmbh | Hydraulic mold locking unit for injection molding machines and presses, has an upper die platen moved by hydraulic cylinders, one with a double-action piston controlled by a proportional valve in the pump system |
-
2018
- 2018-09-20 CN CN201811103870.6A patent/CN110925246B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010131641A (en) * | 2008-12-05 | 2010-06-17 | Toshiba Mach Co Ltd | Injection device for molding machine |
| CN104271331A (en) * | 2012-02-13 | 2015-01-07 | 赫斯基注塑***有限公司 | Flow of hydraulic fluid from accumulator assembly and from pump assembly to actuator where higher flow is required |
| CN104029366A (en) * | 2014-06-12 | 2014-09-10 | 浙江大学 | Energy-saving hydraulic control device of hydraulic injection molding machine |
| CN106015124A (en) * | 2016-07-22 | 2016-10-12 | 中聚信海洋工程装备有限公司 | Hydraumatic fast forging machine set capable of being supplied with pressure superimposedly by hydraulic pumps and high pressure accumulator |
Non-Patent Citations (1)
| Title |
|---|
| REV100塑料注塑―吹塑成型机液压***的改进设计;胡蓉;欧阳资恩;;液压与气动(第06期);第24-28页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110925246A (en) | 2020-03-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104948538B (en) | The servo hydraulic system and its construction method of a kind of plate bending machine | |
| JP6648284B2 (en) | High-speed hydraulic forging press | |
| CN106515066A (en) | Energy-saving hydraulic machine | |
| CN103801751B (en) | Based on the fully-automatic plate shearing machine hydraulic system that PLC controls | |
| CN108150468B (en) | Hydraulic press hydraulic system capable of quickly and stably realizing local loading | |
| CN204646867U (en) | A kind of hydraulic system of cylinder bench | |
| CN109849401B (en) | Energy-saving hydraulic machine and processing method thereof | |
| CN107756864B (en) | Hydraulic press | |
| CN103967869A (en) | Hydraulic cylinder loading detecting device | |
| CN203019708U (en) | Hydraulic control system | |
| CN110925246B (en) | Energy-storage regeneration energy-saving mold opening and closing system and mold opening and closing control method | |
| CN202116932U (en) | Hydraulic system of pulp package pressing machine | |
| CN204099314U (en) | The automatic thickness hydraulic control system of high low pressure independence split | |
| CN108468672B (en) | Energy-saving hydraulic system of stepping heating furnace | |
| CN211279839U (en) | Large-tonnage hydraulic press grading control pressurization system | |
| CN208982380U (en) | A kind of accumulation of energy regenerating energy-saving folding modular system | |
| CN203214495U (en) | Potential energy recycling hydraulic control system of lifting equipment | |
| CN203214496U (en) | Potential energy recycling hydraulic control system of lifting equipment | |
| CN110588039A (en) | Large-tonnage hydraulic press grading control pressurization system | |
| CN204003719U (en) | A kind of forklift multi-way valve of load-sensitive | |
| CN205136241U (en) | Passive volume synchronizer's energy recuperation return circuit | |
| CN206936108U (en) | Combined hydraulic punch press for door and window processing | |
| CN201283672Y (en) | Oil supply system for slide block and hydraulic pad of hydraulic press | |
| CN218266548U (en) | Energy-saving transformation device of quick forging hydraulic unit | |
| CN114131745B (en) | Block forming machine and hydraulic control system thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information | ||
| CB02 | Change of applicant information |
Address after: 215000 No.18 Pingsheng Road, Suzhou Industrial Park, Jiangsu Province Applicant after: Sino-arp Tires Equipment Technology (Suzhou) Co.,Ltd. Address before: 215000 No.18 Pingsheng Road, Suzhou Industrial Park, Jiangsu Province Applicant before: SINO-ARP TIRES EQUIPMENT TECHNOLOGY (SUZHOU) Co.,Ltd. |
|
| GR01 | Patent grant | ||
| GR01 | Patent grant |