CN109253129B - System and method for testing main hydraulic cylinder of radial forging machine - Google Patents
System and method for testing main hydraulic cylinder of radial forging machine Download PDFInfo
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- CN109253129B CN109253129B CN201710566952.3A CN201710566952A CN109253129B CN 109253129 B CN109253129 B CN 109253129B CN 201710566952 A CN201710566952 A CN 201710566952A CN 109253129 B CN109253129 B CN 109253129B
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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
- F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
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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
- F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
- F15B19/005—Fault detection or monitoring
Abstract
The invention discloses a system and a method for testing a main hydraulic cylinder of a radial forging machine, wherein the system comprises a main hydraulic cylinder body, a piston rod, front and rear end covers, a liquid filling valve, a test frame, a pilot hydraulic cylinder and a hydraulic test mechanism, wherein the main hydraulic cylinder body is arranged in the test frame; the hydraulic testing mechanism is connected with oil ports of an oil return cavity, a return cavity and a high-pressure cavity of the main hydraulic cylinder and a rod cavity and a rodless cavity of the pilot hydraulic cylinder through a plurality of hydraulic elements; the method realizes the action, the lowest starting pressure, the internal leakage and the pressure resistance test of the main hydraulic cylinder through the hydraulic test mechanism. The test system and the test method realize the off-line test of the main hydraulic cylinder, save manpower and material resources for maintenance, improve the maintenance efficiency, avoid the repeated disassembly and assembly of the main hydraulic cylinder on the forging machine body, and ensure the maintenance quality.
Description
Technical Field
The invention relates to a system and a method for testing a main hydraulic cylinder of a radial forging machine.
Background
The radial forging machine is key equipment for forging and producing special steel, four hammers of the radial forging machine are driven by four main hydraulic cylinders which are arranged at an angle of 45 degrees with the horizontal plane, and a forged workpiece is formed. The radial forging machine main hydraulic cylinder diameter 730mm, piston rod diameter 670mm 660mm, the main hydraulic cylinder weight is about 16 tons after the assembly, and its structure is special, and is different from conventional pneumatic cylinder, mainly embodies following three aspects: the first, the conventional hydraulic cylinder has two working chambers, and the main hydraulic cylinder has three working chambers, namely a high pressure chamber, a return stroke chamber and an oil return chamber; secondly, the conventional hydraulic cylinder body is provided with a flange or an oil port in threaded connection, the main hydraulic cylinder is only provided with a high-pressure cavity oil port flange on an end cover, the other two cavities are only provided with a plurality of oil flow channels on the cylinder body but cannot be connected with the flange or a joint, the whole main hydraulic cylinder needs to be installed in the forging machine body, and the oil circuit can be connected with the oil port flange on the forging machine body; and thirdly, a liquid charging valve is arranged on the rear end cover of the main hydraulic cylinder, and is controlled by the pilot hydraulic cylinder to follow the piston rod of the main hydraulic cylinder when the main hydraulic cylinder works.
Because the master cylinder structurally has the particularity, the off-line test cannot be performed according to a conventional method after the master cylinder is overhauled, only the master cylinder can be installed in the forging machine body and then is started up for on-line test, if the master cylinder has the overhauling problem, the master cylinder needs to be disassembled from the forging machine body for inspection, and the time consumption of more than twenty hours is needed for disassembling and then installing one master cylinder in the forging machine body, so that the time, the labor and the material resources are greatly wasted.
Because of lacking special frock and test method, therefore the main hydraulic cylinder after overhauing generally does not do the off-line test, carry on the off-line test and must design and make special frock and design and build test system, install displacement sensor in main hydraulic cylinder and the guide's pneumatic cylinder when the field installation, and adopt the servo valve to control, can guarantee that guide's pneumatic cylinder and main hydraulic cylinder piston rod follow-up, but the off-line test does not possess the condition of connecting the sensor, also can not adopt the servo valve to control, therefore, design and adopt the test circuit of conventional hydraulic valve control guide's pneumatic cylinder and main hydraulic cylinder, test main hydraulic cylinder that has three working chambers, become the difficult problem of main hydraulic cylinder test.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a system and a method for testing a main hydraulic cylinder of a radial forging machine, the system overcomes the defect that the main hydraulic cylinder cannot be tested off-line, the manpower and material resources for overhauling the main hydraulic cylinder are effectively saved, the overhauling efficiency is improved, the method implements off-line testing on the main hydraulic cylinder with a special structure, the repeated disassembly and assembly of the main hydraulic cylinder on a forging machine body are avoided, and the overhauling quality of the main hydraulic cylinder is ensured.
In order to solve the technical problem, the test system of the main hydraulic cylinder of the radial forging machine comprises a main hydraulic cylinder body, a piston rod arranged in the main hydraulic cylinder body, a front end cover and a rear end cover which are arranged on the front end surface and the rear end surface of the main hydraulic cylinder body, and a liquid filling valve arranged on the rear end cover, and further comprises a test frame, a pilot hydraulic cylinder and a hydraulic test mechanism, wherein the main hydraulic cylinder body is arranged in the test frame, the front end cover and the rear end cover are arranged on the front end surface and the rear end surface of the test frame, the pilot hydraulic cylinder is arranged on the rear end cover and follows the piston rod through the liquid filling valve, and the test frame is respectively provided with an oil port communicated with a return oil cavity and a return stroke cavity of the main hydraulic cylinder;
the hydraulic testing mechanism comprises a first hydraulic pump set, a second hydraulic pump set, a first overflow valve, a second overflow valve, a first check valve, a second check valve, a first reversing valve, a second reversing valve, a first stop valve, a second stop valve, a first pressure gauge, a second pressure gauge, a third pressure gauge, a fourth pressure gauge and a fifth pressure gauge, wherein the first hydraulic pump set, the first check valve and the first reversing valve are sequentially connected in series, the first overflow valve is connected with the first hydraulic pump set in parallel, the first pressure gauge is connected with the output end of the first check valve, an A port of the first reversing valve is connected with the first stop valve in series and then connected with an oil port of an oil return cavity of a main hydraulic cylinder, an A port of the first reversing valve is connected with the second stop valve in series and then connected with an oil port of a return cavity of the main hydraulic cylinder, and the second pressure gauge and the third pressure gauge are respectively connected with the output ends of the first stop valve and the second stop valve, the hydraulic system comprises a main hydraulic cylinder, a first reversing valve, a second hydraulic pump set, a first overflow valve, a second overflow valve, a first pressure gauge, a second pressure gauge, a first check valve, a second overflow valve, a second check valve, a first check valve, a second check valve, a first reversing valve, a second check valve, a first check valve, a second check valve, a first reversing valve, a second check valve and a second check valve.
A test method of a main hydraulic cylinder of a radial forging machine comprises the following steps:
step one, testing the action of a main hydraulic cylinder;
A. the method comprises the steps that a main hydraulic cylinder is subjected to an idle load test, a first hydraulic pump set and a second hydraulic pump set are started, a first overflow valve is adjusted, and the outlet pressure of the first hydraulic pump set is set to be 5MPa by observing the value of a first pressure gauge; adjusting the second overflow valve, and setting the outlet pressure of the second hydraulic pump set to be 16MPa by observing the value of a fifth pressure gauge; opening the first stop valve and the second stop valve, electrifying the second reversing valve electromagnet a, feeding oil into the rodless cavity of the pilot hydraulic cylinder and returning oil into the rod cavity, and closing the liquid filling valve; the first reversing valve electromagnet a is electrified, and the main hydraulic cylinder high-pressure cavity is fed with oil, the return cavity and the oil return cavity return oil to push a main hydraulic cylinder piston rod to extend to the bottom;
B. after a piston rod of the main hydraulic cylinder extends to the bottom, the electromagnet of the first reversing valve is powered off, the electromagnet b of the second reversing valve is electrified, the rod cavity of the pilot hydraulic cylinder is filled with oil, the rodless cavity is filled with oil, and the liquid filling valve is opened; closing the first stop valve, opening the second stop valve, electrifying the first reversing valve electromagnet b, communicating an oil inlet cavity and an oil return cavity of the main hydraulic cylinder with the high-pressure cavity and connecting oil return through the first reversing valve, and retracting the piston rod of the main hydraulic cylinder to the bottom;
step two, testing the lowest starting pressure of the main hydraulic cylinder;
A. the main hydraulic cylinder is in an idle load, a first hydraulic pump set and a second hydraulic pump set are started, and the outlet pressure of the second hydraulic pump set is set to be 16MPa through a second overflow valve and a fifth pressure gauge; the electromagnet a of the second reversing valve is electrified, the rodless cavity of the pilot hydraulic cylinder is filled with oil, the rod cavity is filled with oil, and the liquid filling valve is closed; opening the first and second shut-off valves; the electromagnet a of the first reversing valve is electrified, the first overflow valve is slowly adjusted, so that the pressure at the outlet of the first hydraulic pump set is gradually increased from zero to the stretching action of the piston rod of the main hydraulic cylinder, and the numerical value of the fourth pressure gauge at the moment is recorded, namely the lowest starting pressure when the piston rod of the main hydraulic cylinder stretches out;
B. the main hydraulic cylinder is in an idle load, a first hydraulic pump set and a second hydraulic pump set are started, and the outlet pressure of the second hydraulic pump set is set to be 16MPa through a second overflow valve and a fifth pressure gauge; the electromagnet b of the second reversing valve is electrified, the rod cavity of the pilot hydraulic cylinder is filled with oil, the rodless cavity is filled with oil, and the liquid filling valve is opened; closing the first stop valve, opening the second stop valve, electrifying the first reversing valve electromagnet b, slowly adjusting the first overflow valve to ensure that the outlet pressure of the first hydraulic pump set is gradually increased from zero to the retraction action of the piston rod of the main hydraulic cylinder, and recording the numerical value of a third pressure gauge at the moment, namely the numerical value is the lowest starting pressure when the piston rod of the main hydraulic cylinder is retracted;
thirdly, performing a leakage test in the main hydraulic cylinder;
A. b, testing leakage in a return cavity of the main hydraulic cylinder, completely retracting a piston rod of the main hydraulic cylinder according to the step B, electrifying an electromagnet a of a second reversing valve, closing a liquid filling valve, adjusting the pressure from a first overflow valve to an outlet of a first hydraulic pump set to be 7Mpa, maintaining the pressure for 10 minutes, and respectively measuring the leakage of an oil outlet of a high-pressure cavity and the leakage of an oil outlet of an oil return cavity;
B. b, testing leakage in a high-pressure cavity of the main hydraulic cylinder, enabling a piston rod of the main hydraulic cylinder to extend out and stay at a stroke of 110mm according to the step A, adopting a kiloton oil press to prop against the piston rod, adjusting a first overflow valve to enable the pressure of the high-pressure cavity of the main hydraulic cylinder to be 14.5Mpa, maintaining the pressure for 10 minutes, and measuring the leakage rate of an oil outlet of a rodless cavity of a pilot hydraulic cylinder and the leakage rate of an oil outlet of an oil return cavity of the main hydraulic cylinder;
step four, performing a master hydraulic cylinder pressure resistance test;
A. b, testing the pressure resistance of a return cavity of the main hydraulic cylinder, completely retracting a piston rod of the main hydraulic cylinder according to the step B, electrifying an electromagnet a of a second reversing valve, closing a liquid filling valve, adjusting the pressure of a first overflow valve to the outlet of a first hydraulic pump set to be 10.5Mpa, and maintaining the pressure for 10 minutes;
B. and C, performing pressure resistance test on the oil return cavity of the main hydraulic cylinder, completely retracting the piston rod of the main hydraulic cylinder according to the step B, electrifying the electromagnet a of the second reversing valve, and closing the liquid charging valve. Adjusting the first overflow valve to enable the outlet pressure of the first hydraulic pump set to be reduced to zero, powering off the electromagnet of the first reversing valve, powering off the second reversing valve, closing the second stop valve, opening the first stop valve, electrifying the electromagnet b of the first reversing valve, adjusting the first overflow valve to enable the outlet pressure of the first hydraulic pump set to be 1.5Mpa, and maintaining the pressure for 10 minutes;
C. and C, performing pressure resistance test on the high-pressure cavity of the main hydraulic cylinder, extending the piston rod of the main hydraulic cylinder to stay at a stroke of 110mm according to the step A, propping the piston rod by adopting a kiloton oil press, adjusting a first overflow valve to enable the pressure of the high-pressure cavity of the main hydraulic cylinder to be 14.5Mpa, and maintaining the pressure for 10 minutes.
Further, in the step one, the master cylinder action test is carried out, and the steps A and B are repeated in sequence, so that the piston rod of the master cylinder reciprocates for more than 5 times in the full stroke.
The system comprises a main hydraulic cylinder body, a piston rod, front and rear end covers, a liquid filling valve, a test frame, a pilot hydraulic cylinder and a hydraulic test mechanism, wherein the piston rod, the front and rear end covers, the liquid filling valve, the test frame, the pilot hydraulic cylinder and the hydraulic test mechanism are arranged in the main hydraulic cylinder body; the hydraulic testing mechanism is connected with oil ports of an oil return cavity, a return cavity and a high-pressure cavity of the main hydraulic cylinder and a rod cavity and a rodless cavity of the pilot hydraulic cylinder through a plurality of hydraulic elements; the method realizes the action, the lowest starting pressure, the internal leakage and the pressure resistance test of the main hydraulic cylinder through the hydraulic test mechanism. The test system overcomes the defect that the main hydraulic cylinder cannot be tested offline, effectively saves manpower and material resources for overhauling the main hydraulic cylinder, improves the overhauling efficiency, implements offline test on the main hydraulic cylinder with a special structure, avoids repeated disassembly and assembly of the main hydraulic cylinder on the forging machine body, and ensures the overhauling quality of the main hydraulic cylinder.
Drawings
The invention is described in further detail below with reference to the following figures and embodiments:
FIG. 1 is a schematic diagram of a system for testing a main hydraulic cylinder of a radial forging machine according to the present invention.
Detailed Description
The embodiment of the invention is shown in fig. 1, the test system of the main hydraulic cylinder of the radial forging machine comprises a main hydraulic cylinder body 1, a piston rod 2 arranged in the cylinder body 1, a front end cover 3 and a rear end cover 4 arranged on the front and rear end surfaces of the cylinder body 1, and a liquid charging valve 5 arranged on the rear end cover 4, the system also comprises a test frame 6, a pilot hydraulic cylinder 7 and a hydraulic test mechanism 8, the main hydraulic cylinder body 1 is arranged in the test frame 6, the front end cover 3 and the rear end cover 4 are arranged on the front and rear end surfaces of the test frame 6, the pilot hydraulic cylinder 7 is arranged on the rear end cover 4 and follows the piston rod 2 through the liquid charging valve 5, and the test frame 6 is respectively provided with oil ports 11 and 12 communicated with a return oil cavity and a return oil cavity of the main hydraulic cylinder;
the hydraulic testing mechanism comprises a first hydraulic pump group 81, a second hydraulic pump group 82, a first overflow valve 83, a second overflow valve 84, a first check valve 85, a second check valve 86, a first reversing valve 87, a second reversing valve 88, a first stop valve 89, a second stop valve 90, a first pressure gauge 91, a second pressure gauge 92, a third pressure gauge 93, a fourth pressure gauge 94 and a fifth pressure gauge 95, wherein the first hydraulic pump group 81, the first check valve 85 and the first reversing valve 87 are sequentially connected in series, the first overflow valve 83 is connected with the first hydraulic pump group 81 in parallel, the first pressure gauge 91 is connected with the output end of the first check valve 85, the port A of the first reversing valve 87 is connected with the first stop valve 89 in series and then connected with the oil port 11 of the main hydraulic cylinder oil return cavity, the port A of the first reversing valve 87 is connected with the second stop valve 90 in series and then connected with the oil port 12 of the main hydraulic cylinder return cavity, the second pressure gauge 92 and the third pressure gauge 93 are respectively connected with output ends of the first stop valve 89 and the second stop valve 90, a port B of the first reversing valve 87 is connected with the high-pressure cavity oil port 13 of the main hydraulic cylinder, the fourth pressure gauge 94 is connected with a port B of the first reversing valve 87, the second hydraulic pump set 82, the second check valve 86 and the second reversing valve 88 are sequentially connected in series, the second overflow valve 84 is connected in parallel with the second hydraulic pump set 82, the fifth pressure gauge 95 is connected with an output end of the second check valve 86, and a port a and a port B of the second reversing valve 88 are respectively connected with the rod cavity 71 and the rodless cavity 72 of the pilot hydraulic cylinder 7.
A test method of a main hydraulic cylinder of a radial forging machine comprises the following steps:
step one, testing the action of a main hydraulic cylinder;
A. the main hydraulic cylinder is subjected to an idle load test, a first hydraulic pump group 81 and a second hydraulic pump group 82 are started, a first overflow valve 83 is adjusted, and the outlet pressure of the first hydraulic pump group 81 is set to be 5MPa by observing the value of a first pressure gauge 91; adjusting the second overflow valve 84, and observing the value of a fifth pressure gauge 95, and setting the outlet pressure of the second hydraulic pump set 82 to be 16 MPa; opening a first stop valve 89 and a second stop valve 90, electrifying an electromagnet a of a second reversing valve 88, feeding oil into a rodless cavity 72 of the pilot hydraulic cylinder 7 and feeding oil into a rod cavity 71, and closing the liquid charging valve 5; the electromagnet a of the first reversing valve 87 is electrified, the main hydraulic cylinder high-pressure cavity 13 is fed with oil, the return cavity 12 and the oil return cavity 11 return oil, and the main hydraulic cylinder piston rod 2 is pushed to extend to the bottom;
B. after the piston rod 2 of the main hydraulic cylinder extends to the bottom, the electromagnet of the first reversing valve 87 is powered off, the electromagnet b of the second reversing valve 88 is electrified, the oil is fed into the rod cavity 71 of the pilot hydraulic cylinder 7, the oil is fed into the rodless cavity 72, and the liquid filling valve 5 is opened; the first stop valve 89 is closed, the second stop valve 90 is opened, the electromagnet b of the first reversing valve 87 is electrified, the oil inlet and return cavity 11 of the main hydraulic cylinder return cavity 12 is communicated with the high-pressure cavity 13 and is connected with return oil through the first reversing valve 87, and the piston rod 2 of the main hydraulic cylinder retracts to the bottom;
step two, testing the lowest starting pressure of the main hydraulic cylinder;
A. the main hydraulic cylinder is in idle load, a first hydraulic pump group 81 and a second hydraulic pump group 82 are started, and the outlet pressure of the second hydraulic pump group 82 is set to be 16MPa through a second overflow valve 84 and a fifth pressure gauge 95; the electromagnet a of the second reversing valve 88 is electrified, the rodless cavity 72 of the pilot hydraulic cylinder 7 is filled with oil, the rod cavity 71 is filled with oil, and the liquid filling valve 5 is closed; opening the first and second cutoff valves 89 and 90; the electromagnet a of the first reversing valve 87 is electrified, the first overflow valve 83 is slowly adjusted, the pressure at the outlet of the first hydraulic pump group 81 is gradually increased from zero to the extending action of the piston rod 2 of the master hydraulic cylinder, and the value of the fourth pressure gauge 94 at the moment is recorded, namely the lowest starting pressure when the piston rod 2 of the master hydraulic cylinder extends;
B. the main hydraulic cylinder is in idle load, a first hydraulic pump group 81 and a second hydraulic pump group 82 are started, and the outlet pressure of the second hydraulic pump group 82 is set to be 16MPa through a second overflow valve 84 and a fifth pressure gauge 95; the electromagnet b of the second reversing valve 88 is electrified, the rod cavity 71 of the pilot hydraulic cylinder 7 is filled with oil, the rodless cavity 72 is filled with oil, and the liquid filling valve 5 is opened; closing the first stop valve 89, opening the second stop valve 90, electrifying the electromagnet b of the first reversing valve 87, slowly adjusting the first overflow valve 83 to ensure that the pressure at the outlet of the first hydraulic pump group 81 is gradually increased from zero to the retraction action of the piston rod 2 of the main hydraulic cylinder, and recording the numerical value of the third pressure gauge 93 at the moment, namely the lowest starting pressure when the piston rod 2 of the main hydraulic cylinder is retracted;
thirdly, performing a leakage test in the main hydraulic cylinder;
A. b, testing leakage in a return cavity of the main hydraulic cylinder, completely retracting a piston rod 2 of the main hydraulic cylinder according to the step B, electrifying an electromagnet a of a second reversing valve 88, closing a liquid filling valve 5, adjusting the pressure of an outlet from a first overflow valve 83 to a first hydraulic pump set 81 to be 7Mpa, maintaining the pressure for 10 minutes, and respectively measuring the leakage of an oil outlet of a high-pressure cavity 13 and the leakage of an oil outlet 11 of an oil return cavity;
B. the method comprises the steps that (A) leakage in a high-pressure cavity of a main hydraulic cylinder is tested, a piston rod 2 of the main hydraulic cylinder extends out and stays at a stroke of 110mm according to the step (A), a kiloton oil press is adopted to support the piston rod 2, a first overflow valve 83 is adjusted, the pressure of a high-pressure cavity 13 of the main hydraulic cylinder is 14.5Mpa, the pressure is maintained for 10 minutes, and the leakage quantity of an oil outlet of a rodless cavity 72 of a pilot hydraulic cylinder 7 and the leakage quantity of an oil outlet 11 of an oil return cavity of the main hydraulic cylinder are measured;
step four, performing a master hydraulic cylinder pressure resistance test;
A. testing the pressure resistance of the return cavity of the main hydraulic cylinder, completely retracting the piston rod 2 of the main hydraulic cylinder according to the step one B, electrifying the electromagnet a of the second reversing valve 88, closing the liquid charging valve 5, adjusting the pressure of the first overflow valve 83 to the outlet of the first hydraulic pump group 8 to be 10.5Mpa, and maintaining the pressure for 10 minutes;
B. b, performing pressure resistance test on an oil return cavity of the main hydraulic cylinder, completely retracting the piston rod 2 of the main hydraulic cylinder according to the step B, electrifying an electromagnet a of a second reversing valve 88, and closing a liquid charging valve 5; adjusting the first overflow valve 83 to enable the outlet pressure of the first hydraulic pump set 81 to be reduced to zero, powering off the electromagnet of the first reversing valve 87, powering off the electromagnet of the second reversing valve 88, closing the second stop valve 90, opening the first stop valve 89, electrifying the electromagnet b of the first reversing valve 87, adjusting the first overflow valve 83 until the outlet pressure of the first hydraulic pump set 81 is 1.5Mpa, and maintaining the pressure for 10 minutes;
C. and (3) performing pressure resistance test on the high-pressure cavity of the main hydraulic cylinder, extending the piston rod 2 of the main hydraulic cylinder to stay at a stroke of 110mm according to the step A, propping the piston rod 2 by adopting a kiloton oil press, adjusting a first overflow valve 83 to enable the pressure of the high-pressure cavity 13 of the main hydraulic cylinder to be 14.5Mpa, and maintaining the pressure for 10 minutes.
Preferably, in the step one, the master cylinder action test is carried out, and the steps A and B are repeated in sequence, so that the piston rod 2 of the master cylinder reciprocates for more than 5 times in the full stroke.
The radial forging machine applying the main hydraulic cylinder is mostly a product of German SMS-MEER company, and in order to solve the problem of offline testing of the main hydraulic cylinder of the radial forging machine, the system designs and manufactures a special tool of a test frame, the main hydraulic cylinder is assembled and then is installed in the test frame during testing, and a pilot hydraulic cylinder is assembled and connected with an oil return cavity oil port and a return cavity oil port of the main hydraulic cylinder, and a hydraulic testing mechanism is respectively connected with the oil return cavity oil port, the return cavity oil port and a high pressure cavity oil port of the main hydraulic cylinder and a rod cavity and a rodless cavity of the pilot hydraulic cylinder, so that the action, the lowest starting pressure, the internal leakage and the pressure resistance test of the main hydraulic cylinder are realized.
Claims (3)
1. The utility model provides a radial test system who forges quick-witted master cylinder, includes the master cylinder body, locates piston rod in the cylinder body, locate the front end housing and the rear end cap of terminal surface around the cylinder body locate the prefill valve of rear end cap, its characterized in that: the hydraulic testing device comprises a main hydraulic cylinder body, a testing frame, a pilot hydraulic cylinder and a hydraulic testing mechanism, wherein the main hydraulic cylinder body is arranged in the testing frame, a front end cover and a rear end cover are arranged on the front end face and the rear end face of the testing frame, the pilot hydraulic cylinder is arranged on the rear end cover and follows the piston rod through a liquid filling valve, and the testing frame is respectively provided with an oil port communicated with an oil return cavity and a return cavity of the main hydraulic cylinder;
the hydraulic testing mechanism comprises a first hydraulic pump set, a second hydraulic pump set, a first overflow valve, a second overflow valve, a first check valve, a second check valve, a first reversing valve, a second reversing valve, a first stop valve, a second stop valve, a first pressure gauge, a second pressure gauge, a third pressure gauge, a fourth pressure gauge and a fifth pressure gauge, wherein the first hydraulic pump set, the first check valve and the first reversing valve are sequentially connected in series, the first overflow valve is connected with the first hydraulic pump set in parallel, the first pressure gauge is connected with the output end of the first check valve, an A port of the first reversing valve is connected with the first stop valve in series and then connected with an oil port of an oil return cavity of a main hydraulic cylinder, an A port of the first reversing valve is connected with the second stop valve in series and then connected with an oil port of a return cavity of the main hydraulic cylinder, and the second pressure gauge and the third pressure gauge are respectively connected with the output ends of the first stop valve and the second stop valve, the hydraulic system comprises a main hydraulic cylinder, a first reversing valve, a second hydraulic pump set, a first overflow valve, a second overflow valve, a first pressure gauge, a second pressure gauge, a first check valve, a second overflow valve, a second check valve, a first check valve, a second check valve, a first reversing valve, a second check valve, a first check valve, a second check valve, a first reversing valve, a second check valve and a second check valve.
2. A method for testing a main hydraulic cylinder of a radial forging machine is characterized by comprising the following steps:
step one, testing the action of a main hydraulic cylinder;
A. the method comprises the steps that a main hydraulic cylinder is subjected to an idle load test, a first hydraulic pump set and a second hydraulic pump set are started, a first overflow valve is adjusted, and the outlet pressure of the first hydraulic pump set is set to be 5MPa by observing the value of a first pressure gauge; adjusting the second overflow valve, and setting the outlet pressure of the second hydraulic pump set to be 16MPa by observing the value of a fifth pressure gauge; opening the first stop valve and the second stop valve, electrifying the second reversing valve electromagnet a, feeding oil into the rodless cavity of the pilot hydraulic cylinder and returning oil into the rod cavity, and closing the liquid filling valve; the first reversing valve electromagnet a is electrified, and the oil inlet, return stroke and oil return cavities of the high-pressure cavity of the main hydraulic cylinder return oil to push the piston rod of the main hydraulic cylinder to extend to the bottom;
B. after a piston rod of the main hydraulic cylinder extends to the bottom, the electromagnet of the first reversing valve is powered off, the electromagnet b of the second reversing valve is electrified, the rod cavity of the pilot hydraulic cylinder is filled with oil, the rodless cavity is filled with oil, and the liquid filling valve is opened; closing the first stop valve, opening the second stop valve, electrifying the first reversing valve electromagnet b, communicating an oil inlet cavity and an oil return cavity of the main hydraulic cylinder with the high-pressure cavity and connecting oil return through the first reversing valve, and retracting the piston rod of the main hydraulic cylinder to the bottom;
step two, testing the lowest starting pressure of the main hydraulic cylinder;
A. the main hydraulic cylinder is in an idle load, a first hydraulic pump set and a second hydraulic pump set are started, and the outlet pressure of the second hydraulic pump set is set to be 16MPa through a second overflow valve and a fifth pressure gauge; the electromagnet a of the second reversing valve is electrified, the rodless cavity of the pilot hydraulic cylinder is filled with oil, the rod cavity is filled with oil, and the liquid filling valve is closed; opening the first and second shut-off valves; the electromagnet a of the first reversing valve is electrified, the first overflow valve is slowly adjusted, so that the pressure at the outlet of the first hydraulic pump set is gradually increased from zero to the stretching action of the piston rod of the main hydraulic cylinder, and the numerical value of the fourth pressure gauge at the moment is recorded, namely the lowest starting pressure when the piston rod of the main hydraulic cylinder stretches out;
B. the main hydraulic cylinder is in an idle load, a first hydraulic pump set and a second hydraulic pump set are started, and the outlet pressure of the second hydraulic pump set is set to be 16MPa through a second overflow valve and a fifth pressure gauge; the electromagnet b of the second reversing valve is electrified, the rod cavity of the pilot hydraulic cylinder is filled with oil, the rodless cavity is filled with oil, and the liquid filling valve is opened; closing the first stop valve, opening the second stop valve, electrifying the first reversing valve electromagnet b, slowly adjusting the first overflow valve to ensure that the outlet pressure of the first hydraulic pump set is gradually increased from zero to the retraction action of the piston rod of the main hydraulic cylinder, and recording the numerical value of a third pressure gauge at the moment, namely the numerical value is the lowest starting pressure when the piston rod of the main hydraulic cylinder is retracted;
thirdly, performing a leakage test in the main hydraulic cylinder;
A. b, testing leakage in a return cavity of the main hydraulic cylinder, completely retracting a piston rod of the main hydraulic cylinder according to the step B, electrifying an electromagnet a of a second reversing valve, closing a liquid filling valve, adjusting the pressure from a first overflow valve to an outlet of a first hydraulic pump set to be 7Mpa, maintaining the pressure for 10 minutes, and respectively measuring the leakage of an oil outlet of a high-pressure cavity and the leakage of an oil outlet of an oil return cavity;
B. b, testing leakage in a high-pressure cavity of the main hydraulic cylinder, enabling a piston rod of the main hydraulic cylinder to extend out and stay at a stroke of 110mm according to the step A, adopting a kiloton oil press to prop against the piston rod, adjusting a first overflow valve to enable the pressure of the high-pressure cavity of the main hydraulic cylinder to be 14.5Mpa, maintaining the pressure for 10 minutes, and measuring the leakage rate of an oil outlet of a rodless cavity of a pilot hydraulic cylinder and the leakage rate of an oil outlet of an oil return cavity of the main hydraulic cylinder;
step four, performing a master hydraulic cylinder pressure resistance test;
A. b, testing the pressure resistance of a return cavity of the main hydraulic cylinder, completely retracting a piston rod of the main hydraulic cylinder according to the step B, electrifying an electromagnet a of a second reversing valve, closing a liquid filling valve, adjusting the pressure of a first overflow valve to the outlet of a first hydraulic pump set to be 10.5Mpa, and maintaining the pressure for 10 minutes;
B. b, carrying out pressure resistance test on an oil return cavity of the main hydraulic cylinder, completely retracting a piston rod of the main hydraulic cylinder according to the step B, electrifying an electromagnet a of a second reversing valve, and closing a liquid filling valve;
adjusting the first overflow valve to enable the outlet pressure of the first hydraulic pump set to be reduced to zero, powering off the electromagnet of the first reversing valve, powering off the second reversing valve, closing the second stop valve, opening the first stop valve, electrifying the electromagnet b of the first reversing valve, adjusting the first overflow valve to enable the outlet pressure of the first hydraulic pump set to be 1.5Mpa, and maintaining the pressure for 10 minutes;
C. and C, performing pressure resistance test on the high-pressure cavity of the main hydraulic cylinder, extending the piston rod of the main hydraulic cylinder to stay at a stroke of 110mm according to the step A, propping the piston rod by adopting a kiloton oil press, adjusting a first overflow valve to enable the pressure of the high-pressure cavity of the main hydraulic cylinder to be 14.5Mpa, and maintaining the pressure for 10 minutes.
3. The method for testing a master cylinder of a radial forging machine according to claim 2, wherein: and in the step one, the action of the master cylinder is tested, and the steps A and B are repeated in sequence, so that the piston rod of the master cylinder reciprocates for more than 5 times in the full stroke.
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| CN110608215A (en) * | 2019-09-03 | 2019-12-24 | 江苏恒立液压科技有限公司 | Hydraulic system for hydraulic cylinder performance test and test method |
| CN111958761A (en) * | 2020-08-28 | 2020-11-20 | 太原理工大学 | Press-filtering forming equipment and press-filtering forming method for refractory material blank |
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| GB1031672A (en) * | 1961-05-18 | 1966-06-02 | Woodhouse & Rixson Ltd | Improvements in or relating to machines for forging metal rings |
| SU440039A2 (en) * | 1972-02-21 | 1982-04-23 | Экспериментальный научно-исследовательский институт кузнечно-прессового машиностроения | Pulsator for hydraulic press |
| DE2517039C3 (en) * | 1975-04-17 | 1979-03-08 | Vsesojuznyj Nautschno-Issledovatelskij Instrumentalnij Institut Ssr, Moskau | Die for radial forging |
| DE2648926A1 (en) * | 1976-10-28 | 1978-05-11 | Hans Dipl Ing Beche | Backlash hammer producing drop forged pieces at single stroke - has one face of piston subjected to spring force and other face coupled to pressure medium lead |
| FI791227A (en) * | 1979-04-17 | 1980-10-18 | Jorma Lillbacka | PRESSANORDNING |
| JP2553447B2 (en) * | 1992-12-26 | 1996-11-13 | 桂一郎 吉田 | Processing method and device in swaging machine |
| JP3586750B2 (en) * | 1994-07-12 | 2004-11-10 | 株式会社鍛栄舎 | Manufacturing method of aluminum wheel rim and forging press device |
| US6401516B1 (en) * | 1997-10-15 | 2002-06-11 | Sms Eumuco Gmbh | Hydraulic drive system for forging press or forging machine slides |
| CN100591435C (en) * | 2004-01-15 | 2010-02-24 | Sms欧姆科股份有限公司 | Method for adjusting the position of a mandrel of an extrusion press for producing hollow sections |
| CN2892320Y (en) * | 2006-03-14 | 2007-04-25 | 夏德仕 | Hydraulic electric liquid hammer |
| DE102011000473B4 (en) * | 2011-02-02 | 2017-07-13 | Langenstein & Schemann Gmbh | Pressing machine and method for pressing workpieces |
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| CN203130649U (en) * | 2013-03-18 | 2013-08-14 | 中国铁建重工集团有限公司 | Control valve block equipment for testing hydraulic cylinders |
| CN103591075B (en) * | 2013-11-29 | 2017-02-15 | 徐州重型机械有限公司 | Hydraulic control system synchronous with crane and balancing weight hydraulic cylinder |
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