Hydraulic cylinder system, hydraulic step beam and method of operation thereof

Abstract

The present application relates to a kind of hydraulic cylinder systems, including hydraulic cylinder, energy accumulator, valve control mechanism and the hydraulic source with oil supply port and oil return port;Hydraulic cylinder has rod cavity and two rodless cavities, rod cavity is communicated with oil supply port and oil return port respectively;Two rodless cavities are respectively communicated with oil supply port, oil return port and energy accumulator;Valve control mechanism makes energy accumulator, oil supply port and oil return port respectively alternatively with one oil chamber of hydraulic cylinder communication.In addition, it also relates to the hydraulic stepping beam using the hydraulic cylinder system and the working method of the hydraulic stepping beam.The present application provides a hydraulic spring for hydraulic cylinder, with good energy-saving effect;Through the design of matched oil circuit, for the case of variable load in the process of heavy load descending and ascending, the function of two rodless cavities can be exchanged at any time, which can better meet the working condition requirements, improve energy recovery effect, and better meet the working requirements of hydraulic equipment such as hydraulic stepping beam.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of hydraulic cylinder, and particularly relates to a hydraulic cylinder system, a hydraulic step beam adopting the hydraulic cylinder system and a working method of the hydraulic step beam. BACKGROUND

[0002] In modernized rolling mills, hydraulic step heating furnaces have been widely applied due to their various advantages. Whether it is plate, bar or wire, whether it is a newly-built production line or an old factory renovation, hydraulic step heating furnaces are preferred. Large and medium-sized step furnaces are mainly composed of a step beam, a lifting ramp, a fixed beam and a hydraulic driving mechanism of the step beam. The movement of the billet in the furnace is completed through the lifting of the step beam, the forward movement, the lowering of the step beam and the backward movement. The lifting and lowering of the step beam are driven by the lifting hydraulic cylinder, and the forward movement and the backward movement are driven by the translation cylinder. When the step beam holds the billet, the lifting hydraulic cylinder needs to overcome the total weight of the step beam and the billet to do work, and needs to output a large power. When the step beam is lowered, the lifting hydraulic cylinder will bear a negative load due to the action of gravity. Generally, back pressure is provided to the hydraulic cylinder to make the step beam lower stably. This working condition will make the power output of the hydraulic pump station very uneven. When the step beam is lowered, these energies are not fully utilized, which causes energy waste to some extent. At the same time, the back pressure generated in this condition will cause a large amount of heat of the hydraulic source, and the hydraulic source is prone to failure. In order to ensure the normal work of the hydraulic source, more cooling water will also be consumed. SUMMARY

[0003] The present application relates to a hydraulic cylinder system, a hydraulic step beam adopting the hydraulic cylinder system and a working method of the hydraulic step beam, which can at least solve some defects of the prior art.

[0004] The present application relates to a hydraulic cylinder system, which comprises a hydraulic cylinder, an accumulator, a valve control mechanism and a hydraulic source with an oil supply port and an oil return port.

[0005] The hydraulic cylinder comprises a cylinder barrel, a piston rod and a piston connected to the piston rod and slidingly arranged in the cylinder barrel. A guide column is arranged in the cylinder barrel. The piston rod is a hollow member and is sleeved on the guide column. The piston, the piston rod and the cylinder barrel cooperatively surround to form a rod cavity. The piston rod and the guide column cooperatively surround to form a first rodless cavity. The piston, the guide column and the cylinder barrel cooperatively surround to form a second rodless cavity.

[0006] The rod cavity is in communication with the oil supply port and the oil return port respectively. The first rodless cavity is in communication with the oil supply port, the oil return port and the accumulator respectively. The second rodless cavity is in communication with the oil supply port, the oil return port and the accumulator respectively. The valve control mechanism makes the accumulator, the oil supply port and the oil return port respectively in communication with one of the oil chambers of the hydraulic cylinder.

[0007] As one of the embodiments, the valve control mechanism comprises a first directional control valve, which is a three-position four-way electromagnetic valve, having an A port, a B port, a P port communicating with the oil supply port, and a T port communicating with the oil return port, wherein the first rodless chamber and the second rodless chamber both communicate with the A port, and the rod chamber communicates with the B port.

[0008] As one of the embodiments, the valve control mechanism further comprises a second directional control valve and a third directional control valve, both of which have an oil outlet and two oil inlets respectively communicating with the A port and the accumulator, the oil outlet of the second directional control valve communicates with the first rodless chamber, and the oil outlet of the third directional control valve communicates with the second rodless chamber.

[0009] As one of the embodiments, the oil port side of the first rodless chamber and the second rodless chamber is respectively provided with a check valve, and the conduction direction of the check valve is consistent with the oil inlet direction of the corresponding oil chamber.

[0010] As one of the embodiments, the check valve is a hydraulic check valve, and the hydraulic cylinder system is further provided with a check valve control oil circuit for controlling the on-off of the two check valves.

[0011] As one of the embodiments, the check valve control oil circuit is arranged with a shuttle valve and a reversing control valve capable of controlling the on-off of the oil circuit, the two oil inlets of the shuttle valve respectively communicate with the oil supply port and the accumulator, the oil outlet of the shuttle valve communicates with the oil inlet of the reversing control valve, and the two check valves both communicate with the oil outlet of the reversing control valve.

[0012] As one of the embodiments, the oil port side of the first rodless chamber, the second rodless chamber and the rod chamber is respectively provided with a pressure sensor.

[0013] As one of the embodiments, the hydraulic source is provided with multiple sets of constant pressure variable pumps, and the oil outlet of each constant pressure variable pump communicates with the oil supply port.

[0014] The present application also relates to a hydraulic walking beam, comprising a walking beam body, a lifting hydraulic cylinder for driving the walking beam body to lift, and a translation hydraulic cylinder for driving the walking beam body to translate, wherein the lifting hydraulic cylinder adopts the hydraulic cylinder system as described above.

[0015] The present application also relates to a working method of the above-mentioned hydraulic walking beam, which comprises:

[0016] The static beam support surface is defined as a boundary, and the walking beam actions above the static beam support surface are defined as full load lifting and full load lowering, and the walking beam actions below the static beam support surface are defined as empty load lowering and empty load lifting.

[0017] Empty lifting process: through the valve control in the hydraulic cylinder system, the accumulator supplies pressure oil to the first rodless chamber, the hydraulic source supplies pressure oil to the second rodless chamber, and the rod chamber is connected to the oil return port;

[0018] Full load lifting process: through the valve control in the hydraulic cylinder system, the accumulator supplies pressure oil to the second rodless chamber, the hydraulic source supplies pressure oil to the first rodless chamber, and the rod chamber is connected to the oil return port;

[0019] Horizontal movement forward process: movement and control are completed by the translation hydraulic cylinder;

[0020] Full load descending process: through the valve control in the hydraulic cylinder system, the accumulator is connected with the second rodless chamber and stores energy, the hydraulic source supplies pressure oil to the rod chamber, and the first rodless chamber is connected to the oil return port;

[0021] Empty descending process: through the valve control in the hydraulic cylinder system, the accumulator is connected with the first rodless chamber and stores energy, the hydraulic source supplies pressure oil to the rod chamber, and the second rodless chamber is connected to the oil return port;

[0022] Horizontal movement backward process: movement and control are completed by the translation hydraulic cylinder.

[0023] The present application has at least the following beneficial effects:

[0024] The hydraulic cylinder system provided by the present application divides the rodless chamber of the hydraulic cylinder into the first rodless chamber and the second rodless chamber in parallel, wherein one of the rodless chambers and the rod chamber normally control the movement speed and direction of the hydraulic cylinder, and the other rodless chamber is connected with the accumulator, which is equivalent to providing a hydraulic spring, absorbing potential energy in the heavy load descending process, providing support force to make the heavy load descend stably, and releasing the absorbed potential energy to assist the heavy load to ascend in the heavy load ascending process, having good energy-saving effect, and being able to avoid excessive heating of the hydraulic source and excessive consumption of cooling water and the like. Through the matched oil circuit design, the functions of the two rodless chambers can be exchanged at any time when the variable load appears in the heavy load descending and ascending process, so that the working condition requirements can be better met, the energy recovery effect can be improved, and the hydraulic equipment working demand of the hydraulic step beam and the like can be better adapted. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without any creative effort.

[0026] Figure 1 The structural schematic diagram of the hydraulic cylinder system provided by the present application is shown in the figure.

[0027] Figure 2 The schematic diagram of the action of the step beam provided by the embodiment of the present application;

[0028] Figure 3 The state diagram of the hydraulic cylinder system when the step beam is in empty load and ascending;

[0029] Figure 4 The state diagram of the hydraulic cylinder system when the step beam is in full load and ascending;

[0030] Figure 5 The state diagram of the hydraulic cylinder system when the step beam is in full load and descending;

[0031] Figure 6 The state diagram of the hydraulic cylinder system when the step beam is in empty load and descending. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be described clearly and completely below. Obviously, the described embodiments are only a part of the embodiments of the present application, instead of all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0033] Embodiment one

[0034] As Figure 1 , Figures 3-6 , the embodiment of the present application provides a hydraulic cylinder system, which comprises a hydraulic cylinder 1, an accumulator 5, a valve control mechanism and a hydraulic source 2 with an oil supply port and an oil return port.

[0035] As Figure 1 , Figures 3-6 , the hydraulic cylinder 1 comprises a cylinder barrel 14, a piston rod 15 and a piston connected to the piston rod 15 and slidingly arranged in the cylinder barrel 14. A guide column 16 is arranged in the cylinder barrel 14. The piston rod 15 is a hollow part and is sleeved on the guide column 16. The piston, the piston rod 15 and the cylinder barrel 14 cooperatively form a rod cavity 11. The piston rod 15 and the guide column 16 cooperatively form a first rodless cavity 12. The piston, the guide column 16 and the cylinder barrel 14 cooperatively form a second rodless cavity 13. Preferably, the above-mentioned piston is connected to the end of the piston rod 15 and is also a hollow part and is sleeved on the guide column 16. The above-mentioned rod cavity 11, the first rodless cavity 12 and the second rodless cavity 13 each have an oil port, which can be used as an oil inlet and outlet passage of the corresponding oil cavity.

[0036] As Figure 1 , Figures 3-6The rod cavity 11 is communicated with the oil supply port and the oil return port respectively; the first rodless cavity 12 is communicated with the oil supply port, the oil return port and the accumulator 5 respectively; the second rodless cavity 13 is communicated with the oil supply port, the oil return port and the accumulator 5 respectively. The valve control mechanism makes the accumulator 5, the oil supply port and the oil return port respectively communicate with one of the oil cavities of the hydraulic cylinder 1 alternatively; that is, through the above-mentioned valve control mechanism, the rod cavity 11 is alternatively communicated with the oil supply port or the oil return port, the first rodless cavity 12 is alternatively communicated with the oil supply port, the oil return port or the accumulator 5, and the second rodless cavity 13 is alternatively communicated with the oil supply port, the oil return port or the accumulator 5. Obviously, at the same time, the oil cavities connected with the oil supply port, the oil return port and the accumulator 5 are different.

[0037] It can be understood that the accumulator 5 can be communicated with the first rodless cavity 12 or the second rodless cavity 13; when the accumulator 5 is communicated with the first rodless cavity 12, one of the rod cavity 11 and the second rodless cavity 13 is communicated with the oil supply port, and the other is communicated with the oil return port; when the accumulator 5 is communicated with the second rodless cavity 13, one of the rod cavity 11 and the first rodless cavity 12 is communicated with the oil supply port, and the other is communicated with the oil return port.

[0038] In order to meet the above-mentioned oil circuit design, in one of the embodiments, as shown in Figure 1 , Figures 3-6 The valve control mechanism includes a first direction control valve 31, which is a three-position four-way electromagnetic valve, having an A port, a B port, a P port communicated with the oil supply port and a T port communicated with the oil return port, wherein the first rodless cavity 12 and the second rodless cavity 13 are both communicated with the A port, and the rod cavity 11 is communicated with the B port. On the basis of the first direction control valve 31, the A port needs to be alternatively communicated with the first rodless cavity 12 or the second rodless cavity 13, and in addition, the accumulator 5 also needs to be alternatively communicated with the first rodless cavity 12 or the second rodless cavity 13; accordingly, the valve control mechanism further includes a second direction control valve 32 and a third direction control valve 33, both of which have an oil outlet and two oil inlets communicated with the A port and the accumulator 5 respectively, the oil outlet of the second direction control valve 32 is communicated with the first rodless cavity 12, and the oil outlet of the third direction control valve 33 is communicated with the second rodless cavity 13. Among them, when the oil outlet of the second direction control valve 32 is communicated with the A port, the oil outlet of the third direction control valve 33 is communicated with the accumulator 5; when the oil outlet of the second direction control valve 32 is communicated with the accumulator 5, the oil outlet of the third direction control valve 33 is communicated with the A port. In one of the embodiments, the above-mentioned second direction control valve 32 and third direction control valve 33 can adopt a two-position three-way electromagnetic valve.

[0039] Through the cooperation of the first direction control valve 31, the second direction control valve 32 and the third direction control valve 33, the hydraulic cylinder 1 can be adapted to different working conditions, especially for the load change and the load direction change during the heavy load movement.

[0040] The hydraulic cylinder system provided in the embodiment divides the rodless cavity of the hydraulic cylinder 1 into the first rodless cavity 12 and the second rodless cavity 13 in parallel, wherein one of the rodless cavities is connected with the accumulator 5 when the other rodless cavity and the rod cavity 11 normally control the movement speed and direction of the hydraulic cylinder 1, which is equivalent to providing a hydraulic spring to absorb potential energy during the heavy load descending process, and to provide a supporting force to make the heavy load descend stably. During the heavy load ascending process, the accumulator 5 releases the absorbed potential energy to assist the heavy load ascending, which has a good energy saving effect and can avoid excessive heating of the hydraulic source 2 and excessive consumption of cooling water. Through the matched oil circuit design, the functions of the two rodless cavities can be exchanged at any time when the variable load occurs during the heavy load descending and ascending process, which can better meet the working condition requirements and improve the energy recovery effect.

[0041] Further optimization of the above hydraulic cylinder system is as follows: Figure 1 、 Figures 3-6 The oil port side of the first rodless cavity 12 and the second rodless cavity 13 is respectively provided with a one-way valve 34, the conduction direction of the one-way valve 34 is consistent with the oil inlet direction of the corresponding oil cavity, and the working reliability of the hydraulic cylinder 1 can be improved by arranging the one-way valve 34. Further, the one-way valve 34 is a hydraulic control one-way valve 34, and the hydraulic cylinder system is further provided with a one-way valve 34 control oil circuit for controlling the on-off of the two one-way valves 34. The use of the hydraulic control one-way valve 34 can further expand the working mode of the hydraulic cylinder 1 and increase the application range of the hydraulic cylinder 1. For example, when the step beam moves horizontally, the one-way valve 34 can be in a closed state, and the energy saving effect is better. In one of the embodiments, as follows: Figure 1 、 Figures 3-6 The one-way valve 34 control oil circuit is arranged with a shuttle valve 36 and a reversing control valve 35 capable of controlling the on-off of the oil circuit, the two oil inlets of the shuttle valve 36 are respectively communicated with the oil supply port and the accumulator 5, the oil outlet of the shuttle valve 36 is communicated with the oil inlet of the reversing control valve 35, and the two one-way valves 34 are both communicated with the oil outlet of the reversing control valve 35. In the above embodiment, the reversing control valve 35 can be a two-position three-way electromagnetic valve; the bypass pipes can be respectively arranged on the oil supply pipe at the oil supply port and the pressure oil pipe of the accumulator 5 to connect the two oil inlets of the shuttle valve 36.

[0042] In one of the specific embodiments, as follows: Figure 1 、 Figures 3-6The oil outlet sides of the first rodless cavity 12, the second rodless cavity 13 and the rod cavity 11 are all provided with pressure sensors 4, so that the pressure of each oil cavity can be monitored in real time, and the safety and reliability of the hydraulic cylinder system operation are improved.

[0043] In one of the specific embodiments, the hydraulic source 2 is provided with a plurality of constant-pressure variable pumps, and the oil outlets of the constant-pressure variable pumps are all communicated with the oil supply port. Figure 1 、 Figures 3-6 Based on the design, the number of the constant-pressure variable pumps in use can be adjusted according to different states of heavy load and different working states of the hydraulic cylinder 1, so that the energy saving and environmental protection of the hydraulic cylinder system operation are further improved.

[0044] In one of the specific embodiments, the hydraulic source 2 is provided with a plurality of constant-pressure variable pumps, and the oil outlets of the constant-pressure variable pumps are all communicated with the oil supply port. Figure 1 、 Figures 3-6 The energy storage effect is better, and the operation is more reliable. Each set of the accumulator 5 is provided with a safety valve, and the pressure oil in the accumulator 5 can be emptied to the hydraulic source 2 in an emergency.

[0045] Embodiment two

[0046] The embodiment of the present application provides a hydraulic walking beam, which comprises a walking beam body, a lifting hydraulic cylinder for driving the walking beam body to lift, and a translation hydraulic cylinder for driving the walking beam body to translate, wherein the lifting hydraulic cylinder adopts the hydraulic cylinder system provided in the above embodiment one.

[0047] The present application also relates to a working method of the above hydraulic walking beam, which comprises:

[0048] The walking beam action above the static beam support surface is defined as full load lifting and full load lowering, and the walking beam action below the static beam support surface is defined as empty load lowering and empty load lifting.

[0049] Empty load lifting process: through valve control in the hydraulic cylinder system, the accumulator 5 supplies pressure oil to the first rodless cavity 12, the hydraulic source 2 supplies pressure oil to the second rodless cavity 13, and the rod cavity 11 is connected to the oil return port.

[0050] Full load lifting process: through valve control in the hydraulic cylinder system, the accumulator 5 supplies pressure oil to the second rodless cavity 13, the hydraulic source 2 supplies pressure oil to the first rodless cavity 12, and the rod cavity 11 is connected to the oil return port.

[0051] Horizontal moving forward process: the movement and control are completed by the translation hydraulic cylinder.

[0052] Full load descending process: through valve control in the hydraulic cylinder system, accumulator 5 is connected with second rodless cavity 13 and energy storage, hydraulic source 2 supplies pressure oil to rod cavity 11, and first rodless cavity 12 is connected to the oil return port;

[0053] Empty load descending process: through valve control in the hydraulic cylinder system, accumulator 5 is connected with first rodless cavity 12 and energy storage, hydraulic source 2 supplies pressure oil to rod cavity 11, and second rodless cavity 13 is connected to the oil return port;

[0054] Transverse moving backward process: movement and control are completed by the translation hydraulic cylinder.

[0055] Especially, for the case that the hydraulic cylinder system comprises first direction control valve 31 to third direction control valve 33, the above working method specifically comprises:

[0056] With the static beam support surface as the boundary, the stepping beam action above the static beam support surface is defined as full load ascending and full load descending respectively, and the stepping beam action below the static beam support surface is defined as empty load descending and empty load ascending respectively;

[0057] Empty load ascending process: second direction control valve 32 and third direction control valve 33 are both in the left position, and first direction control valve 31 is in the right position, so that accumulator 5 supplies pressure oil to first rodless cavity 12, hydraulic source 2 supplies pressure oil to second rodless cavity 13, and rod cavity 11 is connected to the oil return port;

[0058] Full load ascending process: second direction control valve 32 and third direction control valve 33 are both in the right position, and first direction control valve 31 is in the right position, so that accumulator 5 supplies pressure oil to second rodless cavity 13, hydraulic source 2 supplies pressure oil to first rodless cavity 12, and rod cavity 11 is connected to the oil return port;

[0059] Transverse moving forward process: movement and control are completed by the translation hydraulic cylinder.

[0060] Full load descending process: second direction control valve 32 and third direction control valve 33 are both in the right position, and first direction control valve 31 is in the left position, so that accumulator 5 is connected with second rodless cavity 13 and energy storage, hydraulic source 2 supplies pressure oil to rod cavity 11, and first rodless cavity 12 is connected to the oil return port;

[0061] Empty load descending process: second direction control valve 32 and third direction control valve 33 are both in the left position, and first direction control valve 31 is in the left position, so that accumulator 5 is connected with first rodless cavity 12 and energy storage, hydraulic source 2 supplies pressure oil to rod cavity 11, and second rodless cavity 13 is connected to the oil return port;

[0062] Transverse moving backward process: movement and control are completed by the translation hydraulic cylinder.

[0063] It can be understood that in the above method, the left and right positions of the directional control valve are relative valve position concepts, and the corresponding oil path connection relationship can be achieved; for example, in the empty load lifting process, the second directional control valve 32 is in the left position, the third directional control valve 33 is in the right position, and the first directional control valve 31 is in the right position, which is also feasible, which can make the accumulator 5 supply pressure oil to the first rodless chamber 12, the hydraulic source 2 supply pressure oil to the second rodless chamber 13, and the rod chamber 11 connected to the oil return port, and in the subsequent other step beam actions, the valve position of the third directional control valve 33 is changed accordingly. That is to say, if in the above embodiment, the two valve positions of the first directional control valve 31 are defined as the first valve position and the second valve position respectively, the two valve positions of the second directional control valve 32 are defined as the third valve position and the fourth valve position respectively, and the two valve positions of the third directional control valve 33 are defined as the fifth valve position and the sixth valve position respectively, it is also a feasible expression method.

[0064] Example three

[0065] The following Figure 1 , for the above-mentioned specific hydraulic step beam, the working process is roughly described as follows:

[0066] The movement of the billet in the furnace is completed by the lifting, advancing, descending and retreating of the step beam body. During the lifting and descending of the billet, the Figures 3-6 , the actions above the static beam support surface are full load lifting and full load descending respectively, and the actions below the static beam support surface are empty load descending and empty load lifting respectively.

[0067] Empty load lifting process: as Figure 1 , the second directional control valve 32 and the third directional control valve 33 are in the left position; the first directional control valve 31 is in the right position; the reversing control valve 35 is in the left position, and the two one-way valves 34 are in the open state. The accumulator 5 supplies pressure oil to the first rodless chamber 12, and the constant pressure variable pump group 21 supplies pressure oil to the second rodless chamber 13. The rod chamber 11 is connected to the oil return port. At this time, the number of constant pressure variable pumps put into work can be increased accordingly.

[0068] Full load lifting process: as Figures 3-6 , the second directional control valve 32 and the third directional control valve 33 are in the right position; the first directional control valve 31 is in the right position; the reversing control valve 35 is in the left position, and the two one-way valves 34 are in the open state. The accumulator 5 supplies pressure oil to the second rodless chamber 13, and the constant pressure variable pump group 21 supplies pressure oil to the first rodless chamber 12. The rod chamber 11 is connected to the oil return port. At this time, the number of constant pressure variable pumps put into work can be reduced accordingly.

[0069] Horizontal movement advancing process: the reversing control valve 35 is in the right position, and the two one-way valves 34 are in the closed state. The movement and control are completed by the translation hydraulic cylinder.

[0070] Full load descending process: as Figure 1 , the second direction control valve 32, the third direction control valve 33 are all in right position; the first direction control valve 31 is in left position; the reversing control valve 35 is in left position, two one-way valves 34 are in open state. The accumulator 5 is connected with the second rodless cavity 13 and carries out energy storage; in energy storage, the constant pressure variable pump group 21 supplies pressure oil to the rod cavity 11, and the first rodless cavity 12 is connected with the oil return port. At this time, the number of constant pressure variable pumps in work can be reduced correspondingly.

[0071] No-load descending process: as Figures 3-6 Figures 2-6 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 , the second direction control valve 32, the third direction control valve 33 are all in left position; the first direction control valve 31 is in left position; the reversing control valve 35 is in left position, two one-way valves 34 are in open state. The accumulator 5 is connected with the first rodless cavity 12 pressure oil and carries out energy storage; in energy storage, the constant pressure variable pump group 21 supplies pressure oil to the rod cavity 11, and the second rodless cavity 13 is connected with the oil return port. At this time, the number of constant pressure variable pumps in work can be reduced correspondingly.

[0072] Horizontal moving backward process: the reversing control valve 35 is in right position, and two one-way valves 34 are in closed state. Movement and control are completed by the translation hydraulic cylinder.

[0073] The above only describes the preferred embodiment of the present application and is not used to limit the present application, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A hydraulic cylinder system, characterized by, The hydraulic cylinder, the accumulator, the valve control mechanism and a hydraulic source with an oil supply port and an oil return port are included; The hydraulic cylinder includes a cylinder barrel, a piston rod, and a piston connected to the piston rod and slidingly arranged in the cylinder barrel, a guide column is arranged in the cylinder barrel, the piston rod is a hollow member and is sleeved on the guide column, the piston, the piston rod and the cylinder barrel cooperatively form a rod cavity, the piston rod and the guide column cooperatively form a first rodless cavity, and the piston, the guide column and the cylinder barrel cooperatively form a second rodless cavity; the piston is connected to an end of the piston rod, and the piston is a hollow member and is sleeved on the guide column; The rod cavity is in communication with the oil supply port and the oil return port respectively; the first rodless cavity is in communication with the oil supply port, the oil return port and the accumulator respectively; the second rodless cavity is in communication with the oil supply port, the oil return port and the accumulator respectively; the valve control mechanism makes the accumulator, the oil supply port and the oil return port selectively communicate with one of the oil cavities of the hydraulic cylinder, The valve control mechanism can switch the accumulator to communicate with the first rodless cavity or the second rodless cavity, when the accumulator communicates with the first rodless cavity, one of the oil cavities in the rod cavity and the second rodless cavity communicates with the oil supply port, and the other oil cavity communicates with the oil return port; when the accumulator communicates with the second rodless cavity, one of the oil cavities in the rod cavity and the first rodless cavity communicates with the oil supply port, and the other oil cavity communicates with the oil return port.

2. The hydraulic cylinder system of claim 1, wherein: The valve control mechanism includes a first directional control valve, which is a three-position four-way electromagnetic valve and has an A port, a B port, a P port in communication with the oil supply port and a T port in communication with the oil return port, wherein the first rodless cavity and the second rodless cavity are in communication with the A port, and the rod cavity is in communication with the B port.

3. The hydraulic cylinder system of claim 2, wherein: The valve control mechanism further includes a second directional control valve and a third directional control valve, both of which have an oil outlet and two oil inlets in communication with the A port and the accumulator respectively, the oil outlet of the second directional control valve is in communication with the first rodless cavity, and the oil outlet of the third directional control valve is in communication with the second rodless cavity.

4. The hydraulic cylinder system of any one of claims 1 to 3, wherein: The oil port side of the first rodless cavity and the second rodless cavity is respectively provided with a check valve, and the conduction direction of the check valve is consistent with the oil inlet direction of the corresponding oil cavity.

5. The hydraulic cylinder system of claim 4, wherein: The check valve is a hydraulic check valve, and the hydraulic cylinder system is further provided with a check valve control oil circuit for controlling the on-off of the two check valves.

6. The hydraulic cylinder system of claim 5, wherein: The check valve control oil circuit is arranged with a shuttle valve and a reversing control valve capable of controlling the on-off of the oil circuit, two oil inlets of the shuttle valve are respectively in communication with the oil supply port and the accumulator, an oil outlet of the shuttle valve is in communication with an oil inlet of the reversing control valve, and the two check valves are both in communication with an oil outlet of the reversing control valve.

7. The hydraulic cylinder system of claim 1, wherein: The oil port side of the first rodless cavity, the second rodless cavity and the rod cavity is respectively provided with a pressure sensor.

8. The hydraulic cylinder system of claim 1, wherein: The hydraulic source is provided with multiple sets of constant pressure variable pumps, and the oil outlets of the constant pressure variable pumps are in communication with the oil supply port.

9. A hydraulic walking beam comprising a walking beam body, a lifting hydraulic cylinder for driving lifting of the walking beam body, and a translation hydraulic cylinder for driving translation of the walking beam body, characterized by: The lifting hydraulic cylinder adopts the hydraulic cylinder system according to any one of claims 1 to 8.

10. The hydraulic step-beam operating method according to claim 9, wherein The working method comprises: The stepping beam action above the static beam supporting surface is defined as full load up and full load down, and the stepping beam action below the static beam supporting surface is defined as empty load down and empty load up, respectively, with the static beam supporting surface as the boundary; Empty load up process: through valve control in the hydraulic cylinder system, the accumulator supplies pressure oil to the first rodless chamber, the hydraulic source supplies pressure oil to the second rodless chamber, and the rod chamber is connected to the oil return port; Full load up process: through valve control in the hydraulic cylinder system, the accumulator supplies pressure oil to the second rodless chamber, the hydraulic source supplies pressure oil to the first rodless chamber, and the rod chamber is connected to the oil return port; Transverse movement forward process: movement and control are completed by the translation hydraulic cylinder; Full load down process: through valve control in the hydraulic cylinder system, the accumulator is connected to the second rodless chamber and stores energy, the hydraulic source supplies pressure oil to the rod chamber, and the first rodless chamber is connected to the oil return port; Empty load down process: through valve control in the hydraulic cylinder system, the accumulator is connected to the first rodless chamber and stores energy, the hydraulic source supplies pressure oil to the rod chamber, and the second rodless chamber is connected to the oil return port; Transverse movement backward process: movement and control are completed by the translation hydraulic cylinder.

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