Hydraulic system

Abstract

The utility model provides a hydraulic system. A first port of a first motor and a second port of a second motor are both communicated with a port A of a second electromagnetic directional valve; a second port of the first motor is respectively communicated with a port A of the first electromagnetic directional valve and a port P of the second electromagnetic directional valve; a first port of the second motor is respectively communicated with a port B of the first electromagnetic directional valve and a port T of the second electromagnetic directional valve; a port P of the first electromagnetic reversing valve is communicated with an oil supply port of the hydraulic oil supply system; when the first electromagnetic reversing valve is in a working state and the second electromagnetic reversing valve is in a cut-off state, the first motor and the second motor are connected in series and rotate synchronously, that is, the first motor and the second motor are connected in series, and the rotating speeds of the two motors are the same. The problems that the rotating speeds of the two motors are different and cannot be controlled due to different loads are solved, a pressure compensation throttling valve does not need to be arranged, only two electromagnetic reversing valves and two motors are needed, control is easy, and cost is low.

Description

Technical Field

[0001] The utility model belongs to the field of hydraulic technology, and more specifically, particularly relates to a hydraulic system. Background Art

[0002] Twin screw motor feeder is a device that uses a twin screw structure to achieve material conveying. Twin screw feeders are particularly suitable for powders and fine particles with good flowability, and are also suitable for materials that are difficult to handle, such as pigments, sticky materials, easily bridged materials, overflow powders, fibers and glass fibers. This type of feeder is a common and economical volumetric feeder on the market. Of course, there are also multiple models of single and twin screw feeders to meet the feeding rate requirements and material handling problems of different customers.

[0003] The feeder with a double screw motor can realize automatic control of the feeder; when the two motors rotate at the same time, the speed of the two motors is required to be synchronized; in order to meet the individual rotation of the motor, a set of electromagnetic reversing valves can be configured for each motor to realize the control of the individual action of each motor through the corresponding electromagnetic reversing valves.

[0004] However, because the loads of the two motors are different, a pressure compensating throttle valve is required to ensure that the speeds of the two motors are the same; using a compensating throttle valve is costly and will result in greater power loss. Utility Model Content

[0005] In view of this, the purpose of the utility model is to provide a hydraulic system for solving the impact of different loads on two motors. It does not require a pressure compensation throttle valve and only requires two electromagnetic reversing valves and two motors. It is simple to control and low cost.

[0006] The present application discloses a hydraulic system, comprising: a first motor, a second motor, a first electromagnetic reversing valve, a second electromagnetic reversing valve and a hydraulic oil supply system;

[0007] The first port of the first motor and the second port of the second motor are both connected to the port A of the second electromagnetic reversing valve;

[0008] The second port of the first motor is connected to the A port of the first electromagnetic reversing valve and the P port of the second electromagnetic reversing valve respectively;

[0009] The first port of the second motor is connected to the B port of the first electromagnetic reversing valve and the T port of the second electromagnetic reversing valve respectively;

[0010] The P port of the first electromagnetic reversing valve is connected to the oil supply port of the hydraulic oil supply system;

[0011] When the first electromagnetic reversing valve is in a working state and the second electromagnetic reversing valve is in a cut-off state, the first motor and the second motor are in a series relationship, and the first motor and the second motor rotate synchronously.

[0012] Optionally, the hydraulic oil supply system includes: a hydraulic pump and an oil tank;

[0013] The oil inlet of the hydraulic pump is connected to the oil outlet of the oil tank;

[0014] The oil outlet of the hydraulic pump serves as the oil supply port of the hydraulic oil supply system.

[0015] Optionally, the T port of the first electromagnetic reversing valve is connected to the oil return port of the oil tank.

[0016] Optionally, the first electromagnetic reversing valve is a three-position four-way electromagnetic reversing valve.

[0017] Optionally, the second solenoid reversing valve is a three-position four-way solenoid reversing valve.

[0018] Optionally, the middle position of the three-position four-way electromagnetic reversing valve is the cut-off position.

[0019] Optionally, when the three-position four-way solenoid directional valve operates in the first working position, port A is connected to port T; port B is connected to port P.

[0020] Optionally, when the three-position four-way electromagnetic reversing valve operates in the second working position, port A is connected to port P; port B is connected to port T.

[0021] Optionally, the two electromagnets of the first electromagnetic reversing valve and the two electromagnets of the second electromagnetic reversing valve have independent power supply circuits.

[0022] Optionally, the first motor and the second motor are the same.

[0023] It can be seen from the above technical scheme that the utility model provides a hydraulic system, in which the first port of the first motor and the second port of the second motor are both connected to the A port of the second electromagnetic reversing valve; the second port of the first motor is respectively connected to the A port of the first electromagnetic reversing valve and the P port of the second electromagnetic reversing valve; the first port of the second motor is respectively connected to the B port of the first electromagnetic reversing valve and the T port of the second electromagnetic reversing valve; the P port of the first electromagnetic reversing valve is connected to the oil supply port of the hydraulic oil supply system; when the first electromagnetic reversing valve is in a working state and the second electromagnetic reversing valve is in a cut-off state, the first motor and the second motor are in a series relationship, and the first motor and the second motor rotate synchronously, that is, the first motor and the second motor are in a series relationship, and the rotation speeds of the two motors are the same, which solves the problem that the rotation speeds of the two motors are different due to different loads and the rotation speed cannot be controlled. There is no need to configure a pressure compensating throttle valve, and only two electromagnetic reversing valves and two motors are required, which is simple to control and low in cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 It is a schematic diagram of a hydraulic system provided by an embodiment of the utility model;

[0026] Figure 2 It is a schematic diagram of a hydraulic oil path involved in a hydraulic system provided in an embodiment of the utility model;

[0027] Figure 3 It is another schematic diagram of a hydraulic oil path involved in a hydraulic system provided by an embodiment of the utility model;

[0028] Figure 4 It is another schematic diagram of a hydraulic oil path involved in a hydraulic system provided by an embodiment of the utility model;

[0029] Figure 5 It is another schematic diagram of a hydraulic oil path involved in a hydraulic system provided by an embodiment of the utility model;

[0030] Figure 6 It is another schematic diagram of a hydraulic oil path involved in a hydraulic system provided by an embodiment of the utility model;

[0031] Figure 7 It is another schematic diagram of a hydraulic oil path involved in a hydraulic system provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0033] In the present application, the term "comprise", "include" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or equipment. In the absence of more restrictions, the elements defined by the sentence "comprise one ..." do not exclude the existence of other identical elements in the process, method, article or equipment including the elements. In addition, the terms "first", "second", "third", "fourth", etc. (if present) in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable in appropriate circumstances, so that the embodiments of the present application described here can be implemented in an order other than those illustrated or described here, for example.

[0034] The embodiment of the present application discloses a hydraulic system for solving the problem in the prior art that the loads of two motors are different and a pressure compensating throttle valve is needed to ensure that the speeds of the two motors are the same; the use of a compensating throttle valve is costly and results in greater power loss.

[0035] See also Figure 1 The hydraulic system includes: a first motor M1, a second motor M2, a first electromagnetic reversing valve K1, a second electromagnetic reversing valve K2 and a hydraulic oil supply system (including Figure 1 B and Y shown).

[0036] The first port of the first motor M1 and the second port of the second motor M2 are both connected to the port A of the second electromagnetic reversing valve K2.

[0037] Specifically, the first port of the first motor M1 is connected to the second port of the second motor M2 and then connected to the port A of the second electromagnetic reversing valve K2.

[0038] That is to say, energy can be transferred between the first motor M1, the second motor M2 and the port A of the second solenoid reversing valve K2, such as the circulation of hydraulic oil; it is worth noting that the working state of the second solenoid reversing valve K2 is different, and the conduction state of the port A of the second solenoid reversing valve K2 is different; that is, the port A of the second solenoid reversing valve K2 can be in a cut-off state or in a conducting state; in the cut-off state, the port A of the second solenoid reversing valve K2 prohibits energy transfer, such as prohibiting hydraulic oil from flowing through the port A of the second solenoid reversing valve K2; in the conducting state, the port A of the second solenoid reversing valve K2 allows energy transfer, such as allowing hydraulic oil to flow through the port A of the second solenoid reversing valve K2.

[0039] The second port of the first motor M1 is communicated with the port A of the first electromagnetic reversing valve K1 and the port P of the second electromagnetic reversing valve K2 respectively.

[0040] That is, energy can be transferred between the second port of the first motor M1 and the port A of the first electromagnetic reversing valve K1 and the port P of the second electromagnetic reversing valve K2, such as hydraulic oil circulation. Specifically, the port A of the first electromagnetic reversing valve K1 transmits hydraulic oil to the port P of the second electromagnetic reversing valve K2 and the second port of the second motor M2, respectively.

[0041] In addition, the working state of the first solenoid reversing valve K1 is different, and the conduction state of the A port of the first solenoid reversing valve K1 is different; that is, the A port of the first solenoid reversing valve K1 can be in a cut-off state or in a conducting state; in the cut-off state, the A port of the first solenoid reversing valve K1 prohibits energy transfer, for example, prohibits hydraulic oil from flowing through the A port of the first solenoid reversing valve K1; in the conducting state, the A port of the first solenoid reversing valve K1 allows energy transfer, for example, allows hydraulic oil to flow through the A port of the first solenoid reversing valve K1.

[0042] The working state of the second solenoid reversing valve K2 is different, and the conduction state of the P port of the second solenoid reversing valve K2 is different; that is, the P port of the second solenoid reversing valve K2 can be in a cut-off state or in a conducting state; in the cut-off state, the P port of the second solenoid reversing valve K2 prohibits energy transfer, for example, prohibits hydraulic oil from flowing through the P port of the second solenoid reversing valve K2; in the conducting state, the P port of the second solenoid reversing valve K2 allows energy transfer, for example, allows hydraulic oil to flow through the P port of the second solenoid reversing valve K2.

[0043] When the port A of the first electromagnetic reversing valve K1 is in the conducting state, if the port P of the second electromagnetic reversing valve K2 is in the blocking state, the port A of the first electromagnetic reversing valve K1 delivers hydraulic oil to the second port of the first motor M1, and it is forbidden to deliver hydraulic oil to the port P of the second electromagnetic reversing valve K2; if the port P of the second electromagnetic reversing valve K2 is in the conducting state, the port A of the first electromagnetic reversing valve K1 delivers hydraulic oil to the second port of the first motor M1 and the port P of the second electromagnetic reversing valve K2 respectively. The delivery direction of the hydraulic oil can also be reversed, which will not be described here one by one.

[0044] A first port of the second motor M2 is communicated with a B port of the first electromagnetic reversing valve K1 and a T port of the second electromagnetic reversing valve, respectively.

[0045] That is, energy can be transferred between the first port of the second motor M2 and the B port of the first electromagnetic reversing valve K1 and the T port of the second electromagnetic reversing valve K2, such as hydraulic oil circulation. Specifically, the B port of the first electromagnetic reversing valve K1 transmits hydraulic oil to the T port of the second electromagnetic reversing valve K2 and the first port of the second motor M2, respectively.

[0046] In addition, the working state of the first solenoid reversing valve K1 is different, and the conduction state of the B port of the first solenoid reversing valve K1 is different; that is, the B port of the first solenoid reversing valve K1 can be in a cut-off state or in a conducting state; in the cut-off state, the B port of the first solenoid reversing valve K1 prohibits energy transfer, for example, prohibits hydraulic oil from flowing through the B port of the first solenoid reversing valve K1; in the conducting state, the B port of the first solenoid reversing valve K1 allows energy transfer, for example, allows hydraulic oil to flow through the B port of the first solenoid reversing valve K1.

[0047] The working state of the second solenoid reversing valve K2 is different, and the conduction state of the T port of the second solenoid reversing valve K2 is different; that is, the T port of the second solenoid reversing valve K2 can be in a cut-off state or in a conducting state; in the cut-off state, the T port of the second solenoid reversing valve K2 prohibits energy transfer, for example, prohibits hydraulic oil from flowing through the T port of the second solenoid reversing valve K2; in the conducting state, the T port of the second solenoid reversing valve K2 allows energy transfer, for example, allows hydraulic oil to flow through the T port of the second solenoid reversing valve K2.

[0048] When the B port of the first electromagnetic reversing valve K1 is in the conducting state, if the T port of the second electromagnetic reversing valve K2 is in the blocking state, the B port of the first electromagnetic reversing valve K1 delivers hydraulic oil to the first port of the second motor M2, and it is forbidden to deliver hydraulic oil to the T port of the second electromagnetic reversing valve K2; if the T port of the second electromagnetic reversing valve K2 is in the conducting state, the B port of the first electromagnetic reversing valve K1 delivers hydraulic oil to the first port of the second motor M2 and the T port of the second electromagnetic reversing valve K2 respectively. The delivery direction of the hydraulic oil can also be reversed, which will not be described here one by one.

[0049] The P port of the first electromagnetic reversing valve K1 is communicated with the oil supply port of the hydraulic oil supply system.

[0050] That is, energy can be transferred between the oil supply port of the hydraulic oil supply system and the P port of the first electromagnetic reversing valve K1, such as hydraulic oil circulation. Specifically, the oil supply port of the hydraulic oil supply system transmits hydraulic oil to the P port of the first electromagnetic reversing valve K1.

[0051] The working state of the first solenoid reversing valve K1 is different, and the conduction state of the P port of the first solenoid reversing valve K1 is different; that is, the P port of the first solenoid reversing valve K1 can be in a cut-off state or in a conducting state; in the cut-off state, the P port of the first solenoid reversing valve K1 prohibits energy transfer, for example, prohibits hydraulic oil from flowing through the P port of the first solenoid reversing valve K1; in the conducting state, the P port of the first solenoid reversing valve K1 allows energy transfer, for example, allows hydraulic oil to flow through the P port of the first solenoid reversing valve K1.

[0052] When the first electromagnetic reversing valve K1 is in the working state and the second electromagnetic reversing valve K2 is in the cut-off state, the first motor M1 and the second motor M2 are in a series relationship, and the first motor M1 and the second motor M2 rotate synchronously.

[0053] That is to say, since the two motors are connected in series, the flow rates flowing through the two motors are equal, so that the rotation speeds of the two motors are the same, thereby achieving synchronization between the first motor M1 and the second motor M2.

[0054] Optionally, the first motor M1 and the second motor M2 are the same; of course, the first motor M1 and the second motor M2 may also be different, which will not be described in detail here.

[0055] In the present embodiment, the first port of the first motor M1 and the second port of the second motor M2 are both connected to the A port of the second electromagnetic reversing valve K2; the second port of the first motor M1 is respectively connected to the A port of the first electromagnetic reversing valve K1 and the P port of the second electromagnetic reversing valve K2; the first port of the second motor M2 is respectively connected to the B port of the first electromagnetic reversing valve K1 and the T port of the second electromagnetic reversing valve K2; the P port of the first electromagnetic reversing valve K1 is connected to the oil supply port of the hydraulic oil supply system; when the first electromagnetic reversing valve K1 is in a working state and the second electromagnetic reversing valve K2 is in a cut-off state, the first motor M1 and the second motor M2 are in a series relationship, and the first motor M1 and the second motor M2 rotate synchronously, that is, the first motor M1 and the second motor M2 are in a series relationship, and the rotation speeds of the two motors are the same, which solves the problem that the rotation speeds of the two motors are different due to different loads and the rotation speed cannot be controlled. There is no need to configure a pressure compensation throttle valve, and only two electromagnetic reversing valves and two motors are required, which is simple to control and low in cost.

[0056] Optionally, the hydraulic oil supply system includes: a hydraulic pump B and an oil tank Y.

[0057] The oil inlet of the hydraulic pump B is connected to the oil outlet of the oil tank Y; the oil outlet of the hydraulic pump B serves as the oil supply port of the hydraulic oil supply system and is connected to the P port of the first electromagnetic reversing valve K1.

[0058] Specifically, the oil inlet of the hydraulic pump B obtains hydraulic oil through the oil outlet of the mailbox, and delivers the hydraulic oil through the oil outlet of the hydraulic pump B to the P port of the first electromagnetic reversing valve K1.

[0059] A hydraulic pump B supplies oil to two hydraulic motors, and two electromagnetic reversing valves are used to automatically control the motor movement, so that the two motors can rotate forward and reverse synchronously, and any motor can rotate forward and reverse (the other motor does not rotate).

[0060] Optionally, the T port of the first electromagnetic reversing valve K1 is connected to the oil return port of the oil tank Y.

[0061] Generally speaking, the P port of the first solenoid reversing valve K1 is the oil inlet, and the T port is the oil outlet, that is, after the first solenoid reversing valve K1 supplies oil to the motor, there is residual oil in the motor, which then flows back to the oil tank Y through the T port for storage.

[0062] Of course, an additional return oil tank Y may be provided specifically for storing return oil. No specific limitation is made here and it may be determined according to the actual situation, which is within the protection scope of this application.

[0063] Optionally, the first electromagnetic reversing valve K1 is a three-position four-way electromagnetic reversing valve.

[0064] Optionally, the second electromagnetic reversing valve K2 is a three-position four-way electromagnetic reversing valve.

[0065] The three-position four-way solenoid directional valve is a common control element in hydraulic systems, mainly used to control the flow direction of fluid.

[0066] The three-position four-way directional valve has three working positions and four oil ports (usually two in and two out), represented by P, T, A, and B, where P is the oil inlet, T is the oil return port, and AB is connected to the upper and lower chambers of the actuator respectively. In the natural position, the valve is in the middle position. The three-position four-way directional valve can be composed of a two-position four-way directional valve and a static position, and has a variety of middle position functional forms.

[0067] In terms of working principle, the three-position four-way solenoid reversing valve adjusts the flow direction of liquid or gas by controlling the switching state of the solenoid coil.

[0068] In addition, the three-position four-way solenoid reversing valve shows high efficiency in hydraulic energy transmission, can work at pressures up to 350bar, and minimizes pressure drop through optimized design. The solenoid of the solenoid reversing valve can be DC or AC, and the coil can be replaced without discharging oil. In general, the three-position four-way solenoid reversing valve has a wide range of applications in hydraulic systems, pneumatic systems, water supply systems, etc. due to its high efficiency, reliability and strong adaptability.

[0069] It should be noted that the working principle of the three-position four-way solenoid reversing valve involves three positions for controlling the flow direction of the fluid, usually referred to as P, T, A and B ports, where P represents the oil inlet, T represents the oil return, and A and B are connected to the upper and lower chambers of the actuator respectively. The following is the working principle of each position:

[0070] Working position three: Some three-position four-way solenoid valves may have a third working position, which usually involves P port being directly connected to T port, while A port and B port are isolated from each other. This configuration may be used to keep the actuator in the current position or for other special control purposes.

[0071] In practical applications, the neutral position function of a three-position four-way solenoid reversing valve may have different forms, such as O-type, M-type, H-type, Y-type, etc. Each neutral position function has different oil circuit connection methods when not powered, thus affecting the behavior of the actuator. For example, the M-type neutral position function can connect the P port with the T port when not powered, while the A port and the B port are isolated from each other, which is suitable for holding loads or for balancing circuits.

[0072] The type of three-position four-way solenoid directional valve is not specifically limited here and can be determined according to actual conditions, all of which are within the protection scope of this application.

[0073] The working principle of the electromagnetic reversing valve is to control the position of the valve core by switching the electromagnetic coil, thereby changing the connection mode of the oil circuit to achieve control of the actuator. This control method has a fast response speed and can accurately control the flow direction of the fluid in the hydraulic system.

[0074] Optionally, the middle position of the three-position four-way solenoid directional valve is the cut-off position.

[0075] Neutral position: When the solenoid reversing valve is not activated (ie, the solenoid coil is not energized), the valve is in the neutral position. In the neutral state, the P port and the T port are closed, and the A port and the B port are closed. This means that the hydraulic system is at rest and no fluid flows to the actuator.

[0076] Optionally, when the three-position four-way solenoid directional valve operates in the first working position, port A is connected to port T; port B is connected to port P.

[0077] First working position: When the electromagnetic coil is energized, according to the specific design of the first working position of the three-position four-way solenoid valve, the P port is connected to the B port, and the A port is connected to the T port. In this state, the fluid flows into the lower chamber (B port) of the actuator, and the fluid in the upper chamber (A port) is discharged through the T port, causing the actuator to move downward.

[0078] Optionally, when the three-position four-way solenoid directional valve operates in the second working position, port A is connected to port P; port B is connected to port T.

[0079] Second working position: When the electromagnetic coil is energized, according to the specific design of the second working position of the three-position four-way solenoid valve, the P port may be connected to the A port, and the B port may be connected to the T port. This state allows the fluid to enter the upper chamber (A port) of the actuator, while the fluid in the lower chamber (B port) returns through the T port, thereby pushing the actuator to move upward.

[0080] It should be noted that the coils corresponding to the first working position and the second working position are energized in different ways. For example, when the first electromagnet of a three-position four-way electromagnetic reversing valve is energized, it is in the first working position, and when the second electromagnet is energized, it is in the second working position.

[0081] Optionally, the two electromagnets of the first electromagnetic reversing valve K1 and the two electromagnets of the second electromagnetic reversing valve K2 have independent power supply circuits.

[0082] That is to say, the present application can independently control the power supply of any one of the electromagnets in the two electromagnetic reversing valves, thereby independently controlling the working states of the two electromagnetic reversing valves.

[0083] Combined with Table 1, the working process of each solenoid valve is explained through the power-on status of each electromagnet:

[0084] (1) Dual motor reverse rotation.

[0085] like Figure 2 As shown, only when the first electromagnet DT1 of the first solenoid reversing valve K1 is energized, the flow direction of the oil flows along the red oil circuit-pink oil circuit-green oil circuit-oil tank Y, that is, the oil outlet of the hydraulic pump B → the P port of the first solenoid reversing valve K1 → the B port of the first solenoid reversing valve K1 → the first port of the second motor M2 → the second port of the second motor M2 → the first port of the first motor M1 → the second port of the first motor M1 → the A port of the first solenoid reversing valve K1 → the T port of the first solenoid reversing valve K1 → the oil return port of the oil tank Y; the two motors rotate counterclockwise at the same time.

[0086] The arrow → indicates the flow direction of the oil. For example, the oil outlet of the pressure pump B → the P port of the first solenoid reversing valve K1 means that the hydraulic oil flows from the oil outlet of the pressure pump B to the P port of the first solenoid reversing valve K1.

[0087] That is to say, the path through which the above-mentioned hydraulic oil flows is: from the oil outlet of the hydraulic pump B to the P port of the first solenoid reversing valve K1; from the P port of the first solenoid reversing valve K1 to the B port of the first solenoid reversing valve K1; from the B port of the first solenoid reversing valve K1 to the first port of the second motor M2; from the first port of the second motor M2 to the second port of the second motor M2; from the second port of the second motor M2 to the first port of the first motor M1; from the first port of the first motor M1 to the second port of the first motor M1; from the second port of the first motor M1 to the A port of the first solenoid reversing valve K1; from the A port of the first solenoid reversing valve K1 to the T port of the first solenoid reversing valve K1; from the T port of the first solenoid reversing valve K1 to the oil return port of the oil tank Y.

[0088] Since the two motors are connected in series, theoretically the flow rate through the two motors is equal, so theoretically the speed of the two motors is the same, thus achieving a synchronization effect.

[0089] (2) Dual motors rotate forward.

[0090] like Figure 3 As shown, only when the first electromagnet DT2 of the first solenoid reversing valve K1 is energized, the flow direction of the oil flows along the red oil circuit-pink oil circuit-green oil circuit-oil tank Y, that is, the oil outlet of the hydraulic pump B → the P port of the first solenoid reversing valve K1 → the A port of the first solenoid reversing valve K1 → the second port of the first motor M1 → the first port of the first motor M1 → the second port of the second motor M2 → the first port of the first motor M1 → the B port of the first solenoid reversing valve K1 → the T port of the first solenoid reversing valve K1 → the oil return port of the oil tank Y; the two motors rotate clockwise at the same time.

[0091] That is to say, the path through which the above-mentioned hydraulic oil flows is: from the oil outlet of the hydraulic pump B to the P port of the first solenoid reversing valve K1; from the P port of the first solenoid reversing valve K1 to the A port of the first solenoid reversing valve K1; from the A port of the first solenoid reversing valve K1 to the second port of the first motor M1; from the second port of the first motor M1 to the first port of the first motor M1; from the first port of the first motor M1 to the second port of the second motor M2; from the second port of the second motor M2 to the first port of the first motor M1; from the first port of the first motor M1 to the B port of the first solenoid reversing valve K1; from the B port of the first solenoid reversing valve K1 to the T port of the first solenoid reversing valve K1; from the T port of the first solenoid reversing valve K1 to the oil return port of the oil tank Y.

[0092] Since the two motors are connected in series, theoretically the flow rate through the two motors is equal, so theoretically the speed of the two motors is the same, thus achieving a synchronization effect.

[0093] (3) The first motor M1 rotates in the reverse direction.

[0094] like Figure 4 As shown, when the first magnet DT1 of the first electromagnetic reversing valve K1 and the first magnet DT3 of the second electromagnetic reversing valve K2 are energized at the same time, the flow direction of the oil flows in the direction indicated by the arrow on the red oil circuit-green oil circuit-oil tank Y, that is, the oil outlet of the hydraulic pump B → the P port of the first electromagnetic reversing valve K1 → the B port of the first electromagnetic reversing valve K1 → the first port of the second motor M2 and the T port of the second electromagnetic reversing valve K2 → the A port of the second electromagnetic reversing valve K2 → the first port of the first motor M1 and the second port of the second motor M2 → the second port of the first motor M1 → the A port of the first electromagnetic reversing valve K1 → the T port of the first electromagnetic reversing valve K1 → the oil return port of the oil tank Y; the first motor M1 rotates counterclockwise. Since the pressures at both ends of the second motor M2 are the same and there is no pressure difference, the second motor M2 does not rotate.

[0095] That is to say, the path through which the hydraulic oil flows is: from the oil outlet of the hydraulic pump B to the P port of the first solenoid reversing valve K1; from the P port of the first solenoid reversing valve K1 to the B port of the first solenoid reversing valve K1; from the B port of the first solenoid reversing valve K1 to the first port of the second motor M2 and the T port of the second solenoid reversing valve K2; from the T port of the second solenoid reversing valve K2 to the A port of the second solenoid reversing valve K2; from the A port of the second solenoid reversing valve K2 to the first and second ports of the first motor M1, respectively. port and the second port of the second motor M2; flows from the first port of the first motor M1 to the second port of the first motor M1; flows from the second port of the first motor M1 to the A port of the first solenoid reversing valve K1 and the P port of the second solenoid reversing valve K2 respectively; flows from the P port of the second solenoid reversing valve K2 to the B port of the second solenoid reversing valve K2 (the B port is cut off); flows from the A port of the first solenoid reversing valve K1 to the T port of the first solenoid reversing valve K1; flows from the T port of the first solenoid reversing valve K1 to the oil return port of the oil tank Y.

[0096] (4) The first motor M1 rotates forward.

[0097] like Figure 5As shown, when the second electromagnet DT2 of the first electromagnetic reversing valve K1 and the first magnet DT3 of the second electromagnetic reversing valve K2 are energized at the same time, the flow direction of the oil flows in the direction indicated by the arrow on the red oil circuit-green oil circuit-oil tank Y, that is, the oil outlet of the hydraulic pump B→the P port of the first electromagnetic reversing valve K1→the A port of the first electromagnetic reversing valve K1→the second port of the first motor M1 and the P port of the second electromagnetic reversing valve K2→the B port of the second electromagnetic reversing valve K2 (the B port is cut off) and the first port of the first motor M1→the second port of the second motor M2 and the A port of the second electromagnetic reversing valve K2→the T port of the second electromagnetic reversing valve K2→the first port of the second motor M2 and the B port of the first electromagnetic reversing valve K1→the T port of the first electromagnetic reversing valve K1→the oil return port of the oil tank Y; the first motor M1 rotates clockwise alone. Since both ends of the second motor M2 are connected to the oil tank Y, and the pressure at both ends is the same and there is no pressure difference, the second motor M2 does not rotate.

[0098] That is to say, the path through which the hydraulic oil flows is: from the oil outlet of the hydraulic pump B to the P port of the first solenoid reversing valve K1; from the P port of the first solenoid reversing valve K1 to the A port of the first solenoid reversing valve K1; from the A port of the first solenoid reversing valve K1 to the second port of the first motor M1 and the P port of the second solenoid reversing valve K2 respectively; from the P port of the second solenoid reversing valve K2 to the B port of the second solenoid reversing valve K2 (the B port is cut off) and from the second port of the first motor M1 to the The first port; flows from the first port of the first motor M1 to the second port of the second motor M2 and the A port of the second solenoid reversing valve K2; flows from the A port of the second solenoid reversing valve K2 to the T port of the second solenoid reversing valve K2; flows from the T port of the second solenoid reversing valve K2 to the first port of the second motor M2 and the B port of the first solenoid reversing valve K1; flows from the T port of the second solenoid reversing valve K2 to the T port of the first solenoid reversing valve K1; flows from the T port of the first solenoid reversing valve K1 to the oil return port of the oil tank Y.

[0099] (5) The second motor M2 rotates in the reverse direction.

[0100] like Figure 6As shown, when the first electromagnet DT1 of the first electromagnetic reversing valve K1 and the second electromagnet DT4 of the second electromagnetic reversing valve K2 are energized at the same time, the flow direction of the oil flows in the direction indicated by the arrow on the red oil circuit-green oil circuit-oil tank Y, that is, the oil outlet of the hydraulic pump B→the P port of the first electromagnetic reversing valve K1→the B port of the first electromagnetic reversing valve K1→the first port of the second motor M2 and the T port of the second electromagnetic reversing valve K2→the B port of the second electromagnetic reversing valve K2 (the B port is cut off) and the second port of the second motor M2→the first port of the first motor M1 and the A port of the second electromagnetic reversing valve K2→the P port of the second electromagnetic reversing valve K2→the second port of the first motor M1 and the A port of the first electromagnetic reversing valve K1→the T port of the first electromagnetic reversing valve K1→the oil return port of the oil tank Y; the second motor M2 rotates counterclockwise. Since both ends of the first motor M1 are connected to the oil tank Y, and the pressure at both ends is the same and there is no pressure difference, the first motor M1 does not rotate.

[0101] That is to say, the path through which the hydraulic oil flows is: from the oil outlet of the hydraulic pump B to the P port of the first solenoid reversing valve K1; from the P port of the first solenoid reversing valve K1 to the B port of the first solenoid reversing valve K1; from the B port of the first solenoid reversing valve K1 to the first port of the second motor M2 and the T port of the second solenoid reversing valve K2; from the T port of the second solenoid reversing valve K2 to the B port of the second solenoid reversing valve K2 (the B port is cut off) and the second port of the second motor M2; from The second port of the second motor M2 flows to the first port of the first motor M1 and the A port of the second solenoid reversing valve K2; flows from the A port of the second solenoid reversing valve K2 to the P port of the second solenoid reversing valve K2; flows from the P port of the second solenoid reversing valve K2 to the second port of the first motor M1 and the A port of the first solenoid reversing valve K1; flows from the A port of the first solenoid reversing valve K1 to the T port of the first solenoid reversing valve K1; flows from the T port of the first solenoid reversing valve K1 to the oil return port of the oil tank Y.

[0102] (6) The second motor M2 rotates forward.

[0103] like Figure 7As shown, when the second electromagnet DT2 of the first electromagnetic reversing valve K1 and the second electromagnet DT4 of the second electromagnetic reversing valve K2 are energized at the same time, the flow direction of the oil flows in the direction indicated by the arrow on the red oil circuit-green oil circuit-oil tank Y, that is, the oil outlet of the hydraulic pump B→the P port of the first electromagnetic reversing valve K1→the A port of the first electromagnetic reversing valve K1→the second port of the first motor M1 and the P port of the second electromagnetic reversing valve K2→the A port of the second electromagnetic reversing valve K2→the first port of the first motor M1 and the second port of the second motor M2→the first port of the second motor M2→the B port of the first electromagnetic reversing valve K1 and the T port of the second electromagnetic reversing valve K2→the T port of the first electromagnetic reversing valve K1 and the B port of the second electromagnetic reversing valve K2 (the B port is cut off)→the return port of the oil tank Y; the second motor M2 rotates clockwise alone. Since the pressure at both ends of the first motor M1 is the same, and there is no pressure difference when the pressure at both ends is the same, the first motor M1 does not rotate.

[0104] That is to say, the path through which the hydraulic oil flows is: from the oil outlet of the hydraulic pump B to the P port of the first solenoid reversing valve K1; from the P port of the first solenoid reversing valve K1 to the A port of the first solenoid reversing valve K1; from the A port of the first solenoid reversing valve K1 to the second port of the first motor M1 and the P port of the second solenoid reversing valve K2; from the P port of the second solenoid reversing valve K2 to the A port of the second solenoid reversing valve K2; from the A port of the second solenoid reversing valve K2 to the first and second ports of the first motor M1 and M2, respectively. port and the second port of the second motor M2; flows from the second port of the second motor M2 to the first port of the second motor M2; flows from the first port of the second motor M2 to the B port of the first solenoid reversing valve K1 and the T port of the second solenoid reversing valve K2 respectively, flows from the B port of the first solenoid reversing valve K1 to the T port of the first solenoid reversing valve K1 and from the T port of the second solenoid reversing valve K2 to the B port of the second solenoid reversing valve K2 (the B port is cut off), and flows from the T port of the first solenoid reversing valve K1 to the oil return port of the oil tank Y.

[0105] Table 1: Electromagnet power-up and motor operation

[0106]

[0107] Among them, "+" means power on; forward rotation means clockwise rotation, and reverse rotation means counterclockwise rotation.

[0108] In this embodiment, only two electromagnetic reversing valves are used to realize the synchronization and forward and reverse rotation of the two motors. A single motor can realize independent forward and reverse switching and can be automatically controlled.

[0109] It should be noted that the prior art uses two sets of proportional valves to control two motors respectively, which can realize the functions of simultaneous rotation, independent rotation and speed regulation of the two motors. In this application, the two motors are connected in series, which requires double the flow rate, and the price cost of the proportional valve, the amplifier driving the proportional valve and the PLC analog signal point is very high.

[0110] In this embodiment, the control electromagnet can be powered on and off by a relay, that is, the utility model only needs two electromagnetic reversing valves and several relays to realize the synchronization of dual motors, forward and reverse switching, and forward and reverse switching of a single motor, which is simple to control and low in cost. In addition, the two motors are in series, and only a single flow rate is needed to achieve the same speed as the prior art.

[0111] The features recorded in the various embodiments in this specification can be replaced or combined with each other, and the same and similar parts between the various embodiments can refer to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system or system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can refer to the partial description of the method embodiment. The system and system embodiments described above are only schematic, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative work.

[0112] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present utility model.

[0113] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A hydraulic system, characterized in that: include: A first motor, a second motor, a first electromagnetic reversing valve, a second electromagnetic reversing valve and a hydraulic oil supply system; The first port of the first motor and the second port of the second motor are both connected to the port A of the second electromagnetic reversing valve; The second port of the first motor is connected to the A port of the first electromagnetic reversing valve and the P port of the second electromagnetic reversing valve respectively; The first port of the second motor is connected to the B port of the first electromagnetic reversing valve and the T port of the second electromagnetic reversing valve respectively; The P port of the first electromagnetic reversing valve is connected to the oil supply port of the hydraulic oil supply system; When the first electromagnetic reversing valve is in a working state and the second electromagnetic reversing valve is in a cut-off state, the first motor and the second motor are in a series relationship, and the first motor and the second motor rotate synchronously.

2. The hydraulic system according to claim 1, characterized in that: The hydraulic oil supply system comprises: a hydraulic pump and an oil tank; The oil inlet of the hydraulic pump is connected to the oil outlet of the oil tank; The oil outlet of the hydraulic pump serves as the oil supply port of the hydraulic oil supply system.

3. The hydraulic system according to claim 2, characterized in that: The T port of the first electromagnetic reversing valve is communicated with the oil return port of the oil tank.

4. The hydraulic system according to claim 1, characterized in that: The first electromagnetic reversing valve is a three-position four-way electromagnetic reversing valve.

5. The hydraulic system according to claim 1, characterized in that: The second electromagnetic reversing valve is a three-position four-way electromagnetic reversing valve.

6. The hydraulic system according to claim 4 or 5, characterized in that: The middle position of the three-position four-way electromagnetic reversing valve is the cut-off position.

7. The hydraulic system according to claim 4 or 5, characterized in that: When the three-position four-way electromagnetic reversing valve works in the first working position, the A port is connected to the T port; and the B port is connected to the P port.

8. The hydraulic system according to claim 4 or 5, characterized in that: When the three-position four-way electromagnetic reversing valve works in the second working position, the A port is connected to the P port; and the B port is connected to the T port.

9. The hydraulic system according to claim 1, characterized in that: The two electromagnets of the first electromagnetic reversing valve and the two electromagnets of the second electromagnetic reversing valve all have independent power supply circuits.

10. The hydraulic system according to claim 1, characterized in that: The first motor and the second motor are identical.

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