Linkage control system of hydraulic cylinder and hydraulic motor

Abstract

The utility model provides a linkage control system of a hydraulic cylinder and a hydraulic motor, which relates to the technical field of excavator hydraulic systems and comprises a hydraulic cylinder, a first oil way, a second oil way, a first overflow oil way, a first hydraulic control one-way valve and a first one-way throttle valve. One end of the first oil way communicates with a rod cavity of the hydraulic cylinder and is used for supplying oil to the rod cavity of the hydraulic cylinder or discharging hydraulic oil in the rod cavity of the hydraulic cylinder. One end of the second oil way is communicated with the rodless cavity of the hydraulic cylinder and is used for discharging hydraulic oil in the rodless cavity of the hydraulic cylinder or supplying oil to the rodless cavity of the hydraulic cylinder; a first overflow valve is arranged on the first overflow oil way and is used for controlling the working pressure of the hydraulic cylinder; the first hydraulic control one-way valve is arranged on the first oil way and used for separating the oil ways. The first one-way throttle valve is arranged on the first oil way and used for controlling the flow of the first oil way. According to the utility model, a hydraulic loop and hydraulic elements are simplified, the manufacturing cost and the failure rate are reduced, and the maintenance is convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic systems for excavators, in particular to a linkage control system for a hydraulic cylinder and a hydraulic motor. Background Art

[0002] At present, excavators usually transmit power through hydraulic systems to control the excavator head replacement device to complete various actions. The hydraulic system of an excavator is a combination of various hydraulic components organically connected by pipelines according to the transmission requirements of the excavator head replacement device and various mechanisms. It mainly includes hydraulic oil tanks, hydraulic pumps, various hydraulic valves, various pipelines, and hydraulic cylinders and hydraulic motors that perform various actions. The hydraulic system of an excavator uses hydraulic oil as the working medium, uses a hydraulic pump to convert the mechanical energy of the engine into hydraulic energy and transmits it, and then converts the hydraulic energy back into mechanical energy through actuators such as hydraulic cylinders and hydraulic motors to achieve various actions of the excavator.

[0003] However, since the hydraulic cylinder and the hydraulic motor have different working pressures and flow requirements, separate hydraulic circuits are usually required for the hydraulic cylinder and the hydraulic motor respectively. As a result, the hydraulic circuits and hydraulic components installed in the narrow space inside the excavator head replacement device are complicated, with a very high failure rate, troublesome maintenance and high construction cost. Utility Model Content

[0004] The purpose of the utility model is to provide a linkage control system of a hydraulic cylinder and a hydraulic motor to solve at least one of the above-mentioned technical problems existing in the prior art.

[0005] In order to solve the above technical problems, the utility model provides a linkage control system of a hydraulic cylinder and a hydraulic motor, comprising: a hydraulic cylinder, a first oil circuit, a second oil circuit, a first overflow oil circuit, a first hydraulically controlled one-way valve and a first one-way throttle valve;

[0006] One end of the first oil circuit is in communication with the rod chamber of the hydraulic cylinder, and is used to supply oil to the rod chamber of the hydraulic cylinder or discharge the hydraulic oil in the rod chamber of the hydraulic cylinder;

[0007] One end of the second oil circuit is in communication with the rodless chamber of the hydraulic cylinder, and is used for discharging the hydraulic oil in the rodless chamber of the hydraulic cylinder or supplying oil to the rodless chamber of the hydraulic cylinder;

[0008] One end of the first overflow oil circuit is arranged on the first oil circuit and communicates with the rod chamber of the hydraulic cylinder, and the other end is communicated with the second oil circuit. A first overflow valve is arranged on the first overflow oil circuit, an oil inlet of the first overflow valve is communicated with the first oil circuit, and an oil drain port of the first overflow valve is communicated with the second oil circuit, for controlling the working pressure of the hydraulic cylinder when oil is supplied from the first oil circuit to the rod chamber of the hydraulic cylinder;

[0009] The first hydraulically controlled one-way valve is arranged on the first oil circuit, and the oil outlet of the first hydraulically controlled one-way valve is respectively connected with the rod chamber of the hydraulic cylinder and the first overflow oil circuit, and is used to separate the oil circuit when oil is supplied from the first oil circuit to the rod chamber of the hydraulic cylinder, so as to prevent the hydraulic oil from flowing back from the first oil circuit through the first hydraulically controlled one-way valve;

[0010] When oil is supplied from the first oil circuit to the rod chamber of the hydraulic cylinder, the load of the hydraulic cylinder increases, and the working pressure of the hydraulic cylinder increases. When the working pressure of the hydraulic cylinder exceeds the maximum working pressure of the hydraulic cylinder, the hydraulic oil cannot flow back from the first oil circuit through the first hydraulically controlled one-way valve, the first overflow valve opens, and part of the hydraulic oil on one side of the oil outlet of the first hydraulically controlled one-way valve overflows from the first overflow oil circuit through the first overflow valve, thereby maintaining the working pressure of the hydraulic cylinder stable.

[0011] The first one-way throttle valve is arranged on the first oil circuit, the oil inlet of the first one-way throttle valve is communicated with the other end of the first oil circuit, and the oil outlet of the first one-way throttle valve is communicated with the oil inlet of the first hydraulically controlled one-way valve, and is used to control the flow of the first oil circuit when the hydraulic oil flows from the first oil circuit to the rod chamber of the hydraulic cylinder, and the first one-way throttle valve does not play a throttling role when the hydraulic oil in the rod chamber of the hydraulic cylinder flows back from the first oil circuit;

[0012] When the hydraulic oil flows from the first oil circuit to the rod chamber of the hydraulic cylinder, the hydraulic oil generates pressure loss through the first one-way throttle valve, and then the pressure of the oil inlet of the first relief valve is reduced, so that the first relief valve controls the working pressure of the hydraulic cylinder and maintains the working pressure of the hydraulic cylinder stable.

[0013] The present application sets a first overflow oil circuit, a first overflow valve on the first overflow oil circuit, a first hydraulically controlled one-way valve and a first one-way throttle valve on the first oil circuit. When oil is supplied from the first oil circuit to the rod chamber of the hydraulic cylinder, the working pressure of the hydraulic cylinder is controlled by the first overflow valve, and the flow of the first oil circuit is controlled by the first one-way throttle valve to meet the flow demand of the hydraulic cylinder. There is no need to set up a separate hydraulic circuit for the hydraulic cylinder, thereby simplifying the hydraulic circuit and hydraulic components set in the narrow space inside the excavator head replacement device, reducing the construction cost and failure rate, and facilitating maintenance.

[0014] Furthermore, the linkage control system of the hydraulic cylinder and the hydraulic motor also includes an oil return tank for recovering the hydraulic oil, preventing the hydraulic oil from being discharged and polluting the environment, and maintaining the pressure balance of the linkage control system of the hydraulic cylinder and the hydraulic motor;

[0015] The other end of the first oil circuit (i.e., the end not connected to the rod chamber of the hydraulic cylinder) and the other end of the second oil circuit (i.e., the end not connected to the rodless chamber of the hydraulic cylinder) can be selectively connected to the hydraulic oil source and the oil return tank respectively;

[0016] When the other end of the first oil circuit (i.e., the end not connected to the rod chamber of the hydraulic cylinder) is connected to the hydraulic oil source and the other end of the second oil circuit (i.e., the end not connected to the rodless chamber of the hydraulic cylinder) is connected to the return oil tank, the hydraulic oil source supplies oil to the rod chamber of the hydraulic cylinder from the first oil circuit, the hydraulic oil in the rodless chamber of the hydraulic cylinder flows from the second oil circuit to the return oil tank, and the hydraulic cylinder rod retracts; when the other end of the second oil circuit (i.e., the end not connected to the rodless chamber of the hydraulic cylinder) is connected to the hydraulic oil source and the other end of the first oil circuit (i.e., the end not connected to the rod chamber of the hydraulic cylinder) is connected to the return oil tank, the hydraulic oil source supplies oil to the rodless chamber of the hydraulic cylinder from the second oil circuit, the hydraulic oil in the rod chamber of the hydraulic cylinder flows from the first oil circuit to the return oil tank, and the hydraulic cylinder rod extends.

[0017] Furthermore, the linkage control system of the hydraulic cylinder and the hydraulic motor further includes: a hydraulic motor and a third oil circuit;

[0018] The hydraulic motor is arranged in the third oil circuit, one end of the third oil circuit is connected with the other end of the first oil circuit (i.e., the end not connected with the rod chamber of the hydraulic cylinder), and the other end is connected with the return oil tank, so as to supply oil to the hydraulic motor, and the hydraulic oil in the hydraulic motor flows from the third oil circuit into the return oil tank;

[0019] The oil inlet of the hydraulic motor is connected to the other end of the first oil circuit (i.e., the end not connected to the rod chamber of the hydraulic cylinder), and the oil return port of the hydraulic motor is connected to the oil return tank, which is used for the transmission of the excavator head replacement device.

[0020] Furthermore, the linkage control system of the hydraulic cylinder and the hydraulic motor also includes a second overflow oil circuit, one end of the second overflow oil circuit is arranged on the first oil circuit, and is respectively connected with the oil outlet of the first one-way throttle valve and the oil inlet of the first hydraulically controlled one-way valve, and the other end is connected with the second oil circuit, a second overflow valve is arranged on the second overflow oil circuit, the oil inlet of the second overflow valve is connected with the first oil circuit, and the oil drain port of the second overflow valve is connected with the second oil circuit, and is used for controlling the working pressure of the hydraulic motor and the hydraulic cylinder when oil is supplied to the rod chamber of the hydraulic motor and the hydraulic cylinder from the third oil circuit and the first oil circuit respectively through the other end of the first oil circuit (i.e., the end not connected with the rod chamber of the hydraulic cylinder);

[0021] When oil is supplied from the third oil circuit to the hydraulic motor through the other end of the first oil circuit (i.e., the end not connected to the rod chamber of the hydraulic cylinder), the load of the hydraulic motor increases, and the working pressure of the hydraulic motor increases. When the working pressure of the hydraulic motor exceeds the maximum working pressure of the hydraulic motor, the second relief valve opens, and part of the hydraulic oil on the oil outlet side of the first one-way throttle valve overflows from the second relief oil circuit through the second relief valve, and flows from the second oil circuit into the return oil tank, so as to maintain the working pressure of the hydraulic motor stable.

[0022] When the hydraulic oil flows from the first oil circuit to the rod chamber of the hydraulic cylinder, the hydraulic oil generates pressure loss through the first one-way throttle valve, and then the pressure at the oil inlet of the second overflow valve is reduced, which facilitates the second overflow valve to control the working pressure of the hydraulic motor and maintain the working pressure of the hydraulic motor stable; part of the hydraulic oil on the oil outlet side of the first one-way throttle valve overflows from the second overflow oil circuit through the second overflow valve, and then the pressure at the oil inlet of the first overflow valve is further reduced, which facilitates the first overflow valve to control the working pressure of the hydraulic cylinder and maintain the working pressure of the hydraulic cylinder stable.

[0023] Furthermore, the opening pressure set for the second relief valve is greater than the opening pressure set for the first relief valve.

[0024] Further, the control oil port of the first hydraulically controlled one-way valve is connected to the second oil circuit, so that when oil is supplied from the second oil circuit to the rodless chamber of the hydraulic cylinder, the hydraulic oil in the rod chamber of the hydraulic cylinder flows back from the first oil circuit through the first hydraulically controlled one-way valve;

[0025] When oil is supplied from the second oil circuit to the rodless chamber of the hydraulic cylinder, the control oil port of the first hydraulically controlled one-way valve receives a pressure signal, the oil outlet of the first hydraulically controlled one-way valve is connected to the oil inlet, and the hydraulic oil in the rod chamber of the hydraulic cylinder flows from the first oil circuit into the return oil tank through the first hydraulically controlled one-way valve.

[0026] Furthermore, a second one-way throttle valve is provided in the first oil circuit, and the second one-way throttle valve is connected in series with the first one-way throttle valve, and is used to control the flow of the first oil circuit when the hydraulic oil in the rod chamber of the hydraulic cylinder flows back from the first oil circuit, and the second one-way throttle valve does not play a throttling role when the hydraulic oil flows from the first oil circuit to the rod chamber of the hydraulic cylinder.

[0027] Preferably, the second one-way throttle valve is arranged between the first hydraulically controlled one-way valve and the first one-way throttle valve, the oil inlet of the second one-way throttle valve is communicated with the oil inlet of the first hydraulically controlled one-way valve, and the oil outlet of the second one-way throttle valve is communicated with the oil outlet of the first one-way throttle valve and the second overflow oil circuit respectively;

[0028] Optionally, the oil inlet of the second one-way throttle valve is respectively connected to the oil inlet of the first hydraulically controlled one-way valve and the second overflow oil circuit, and the oil outlet of the second one-way throttle valve is connected to the oil outlet of the first one-way throttle valve.

[0029] Of course, the second one-way throttle valve can also be arranged between the first one-way throttle valve and the other end of the first oil circuit (i.e., the end not connected to the rod chamber of the hydraulic cylinder), the oil inlet of the second one-way throttle valve is connected to the oil inlet of the first one-way throttle valve, and the oil outlet of the second one-way throttle valve is connected to the other end of the first oil circuit (i.e., the end not connected to the rod chamber of the hydraulic cylinder).

[0030] Preferably, the second one-way throttle valve is composed of a second one-way valve and a second throttle valve connected in parallel;

[0031] The second one-way valve is used to prevent the hydraulic oil from flowing back from the first oil circuit through the second one-way valve when the hydraulic oil in the rod chamber of the hydraulic cylinder is discharged, and to allow the hydraulic oil to flow from the first oil circuit to the rod chamber of the hydraulic cylinder through the second one-way valve when the hydraulic oil is supplied from the first oil circuit to the rod chamber of the hydraulic cylinder;

[0032] The second throttle valve is used to control the flow of the first oil circuit when the hydraulic oil in the rod chamber of the hydraulic cylinder flows back from the first oil circuit through the second throttle valve, and the second throttle valve does not perform a throttling effect when the hydraulic oil flows from the first oil circuit to the rod chamber of the hydraulic cylinder.

[0033] Preferably, the first one-way throttle valve is composed of a first one-way valve and a first throttle valve connected in parallel;

[0034] The first check valve is used to prevent the hydraulic oil from flowing from the first oil circuit to the rod chamber of the hydraulic cylinder through the first check valve when the oil is supplied from the first oil circuit to the rod chamber of the hydraulic cylinder, and to prevent the hydraulic oil from flowing back from the first oil circuit through the first check valve when the hydraulic oil in the rod chamber of the hydraulic cylinder is discharged;

[0035] The first throttle valve is used to control the flow of the first oil circuit when the hydraulic oil flows from the first oil circuit to the rod chamber of the hydraulic cylinder through the first throttle valve, and the first throttle valve does not perform throttling when the hydraulic oil in the rod chamber of the hydraulic cylinder flows back from the first oil circuit.

[0036] Furthermore, the linkage control system of the hydraulic cylinder and the hydraulic motor also includes a first oil drain circuit, an oil drain port is provided on the housing of the hydraulic motor, one end of the first oil drain circuit is connected to the oil drain port of the hydraulic motor, and the other end is connected to the second oil circuit, which is used for draining the hydraulic oil in the housing of the hydraulic motor when oil is supplied to the hydraulic motor from the third oil circuit.

[0037] Furthermore, a third one-way valve is provided on the first oil drain circuit, the oil inlet of the third one-way valve is connected to the oil drain port of the hydraulic motor, and the oil outlet of the third one-way valve is connected to the second oil circuit, for preventing the hydraulic oil from flowing from the first oil drain circuit into the housing of the hydraulic motor through the third one-way valve when oil is supplied from the second oil circuit to the rodless chamber of the hydraulic cylinder.

[0038] When oil is supplied from the third oil circuit to the hydraulic motor, the hydraulic oil in the hydraulic motor housing is discharged from the first oil drain circuit through the third one-way valve and flows into the oil return tank from the second oil circuit; when oil is supplied from the second oil circuit to the rodless chamber of the hydraulic cylinder, the pressure of the second oil circuit is greater than the pressure of the hydraulic motor drain port, and the hydraulic oil in the hydraulic motor housing cannot be discharged from the first oil drain circuit, and the hydraulic oil in the second oil circuit cannot flow from the first oil drain circuit into the housing of the hydraulic motor through the third one-way valve.

[0039] Furthermore, the linkage control system of the hydraulic cylinder and the hydraulic motor also includes a second oil drain circuit, one end of which is connected to the oil drain port of the hydraulic motor, and the other end is arranged on the third oil circuit and connected to the oil return port of the hydraulic motor, for draining the hydraulic oil in the hydraulic motor housing when oil is supplied from the second oil circuit to the rodless chamber of the hydraulic cylinder.

[0040] Furthermore, a fourth one-way valve is provided on the second oil drain circuit, the oil inlet of the fourth one-way valve is communicated with the oil drain port of the hydraulic motor, and the oil outlet of the fourth one-way valve is communicated with the third oil circuit, for preventing the hydraulic oil in the hydraulic motor from flowing into the housing of the hydraulic motor through the fourth one-way valve from the second oil drain circuit when the hydraulic oil flows into the return oil tank from the third oil circuit.

[0041] When oil is supplied from the third oil circuit to the hydraulic motor, the pressure at the return oil port of the hydraulic motor is greater than the pressure at the drain oil port of the hydraulic motor, and the hydraulic oil in the hydraulic motor housing cannot be drained from the second drain oil circuit. At the same time, the hydraulic oil in the third oil circuit cannot flow from the second drain oil circuit into the hydraulic motor housing through the fourth one-way valve. When oil is supplied from the second oil circuit to the rodless chamber of the hydraulic cylinder, the hydraulic oil in the hydraulic motor housing leaks from the second drain oil circuit through the fourth one-way valve and flows from the third oil circuit into the return oil tank.

[0042] Furthermore, the linkage control system of the hydraulic cylinder and the hydraulic motor also includes a chain lubricating oil circuit, one end of the chain lubricating oil circuit is connected to the oil drain port of the hydraulic motor, and the other end is a chain lubricating oil port, which is used to discharge the hydraulic oil in the hydraulic motor housing, and then lubricate the chain through the hydraulic oil discharged from the chain lubricating oil port.

[0043] Furthermore, the linkage control system of the hydraulic cylinder and the hydraulic motor further includes a back pressure one-way valve and a second hydraulically controlled one-way valve;

[0044] The back pressure check valve is arranged on the third oil circuit, the oil inlet of the back pressure check valve is communicated with the oil return port of the hydraulic motor, and the oil outlet of the back pressure check valve is communicated with the oil return tank, so as to generate a pressure signal when the hydraulic oil passes through the back pressure check valve;

[0045] The second hydraulically controlled one-way valve is arranged in the chain lubricating oil circuit, the oil inlet of the second hydraulically controlled one-way valve is connected with the chain lubricating oil port, the oil outlet of the second hydraulically controlled one-way valve is connected with the oil drain port of the hydraulic motor, and the control oil port of the second hydraulically controlled one-way valve is respectively connected with the return oil port of the hydraulic motor and the oil inlet of the back pressure one-way valve on the third oil circuit, so as to control the on-off of the chain lubricating oil circuit.

[0046] When the hydraulic oil flows from the third oil circuit into the oil return tank through the back pressure check valve, the back pressure check valve opens to generate a pressure signal, the control oil port of the second hydraulically controlled check valve receives the pressure signal, the oil outlet of the second hydraulically controlled check valve is connected with the oil inlet of the second hydraulically controlled check valve, the hydraulic oil in the hydraulic motor housing flows into the chain lubricating oil circuit through the second hydraulically controlled check valve, and is discharged from the chain lubricating oil port to lubricate the chain; when the back pressure check valve is closed, the control oil port of the second hydraulically controlled check valve does not receive a pressure signal, and the hydraulic oil in the hydraulic motor housing cannot flow into the chain lubricating oil circuit through the second hydraulically controlled check valve.

[0047] Furthermore, a third throttle valve is provided on the chain lubricating oil circuit for controlling the flow of the chain lubricating oil circuit when the hydraulic oil in the hydraulic motor housing leaks out from the chain lubricating oil circuit, thereby controlling the flow of the first oil leakage circuit or the second oil leakage circuit.

[0048] By adopting the above technical solution, the utility model has the following beneficial effects:

[0049] The utility model provides a linkage control system of a hydraulic cylinder and a hydraulic motor, which controls the working pressure of the hydraulic cylinder by a first relief valve, controls the flow of a first oil circuit by a first one-way throttle valve, and controls the working pressure of the hydraulic motor by a second relief valve. There is no need to set separate hydraulic circuits for the hydraulic cylinder and the hydraulic motor, respectively, thereby simplifying the hydraulic circuits and hydraulic components set in the narrow space inside the excavator head replacement device, reducing the construction cost and failure rate, and facilitating maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0051] Figure 1 A connection diagram of a linkage control system of a hydraulic cylinder and a hydraulic motor provided in an embodiment of the utility model;

[0052] Figure 2 A connection diagram of a linkage control system of a hydraulic cylinder and a hydraulic motor provided in another embodiment of the utility model;

[0053] Figure 3 A connection diagram of a linkage control system of a hydraulic cylinder and a hydraulic motor provided in yet another embodiment of the utility model.

[0054] Reference numerals:

[0055] 1-first one-way throttle valve; 2-second one-way throttle valve; 3-first hydraulically controlled one-way valve; 4-second overflow valve; 5-first overflow valve; 6-hydraulic cylinder; 7-hydraulic motor; 8-back pressure one-way valve; 9-second hydraulically controlled one-way valve; 10-third throttle valve; 11-chain lubricating oil port; 12-fourth one-way valve; 13-third one-way valve. DETAILED DESCRIPTION

[0056] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments 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.

[0057] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0058] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0059] The present invention will be further explained below in conjunction with specific implementation methods.

[0060] It should also be noted that the following specific embodiments or specific implementations are a series of optimized settings listed in the present invention to further explain the specific contents of the utility model, and these settings can be used in combination or in association with each other.

[0061] Example 1

[0062] like Figure 1 As shown, the present embodiment provides a linkage control system of a hydraulic cylinder and a hydraulic motor, comprising: a hydraulic cylinder 6, a first oil circuit, a second oil circuit, a first overflow oil circuit, a first hydraulically controlled one-way valve 3 and a first one-way throttle valve 1;

[0063] One end of the first oil circuit is in communication with the rod chamber of the hydraulic cylinder 6, and is used to supply oil to the rod chamber of the hydraulic cylinder 6 or discharge the hydraulic oil in the rod chamber of the hydraulic cylinder 6;

[0064] One end of the second oil circuit is in communication with the rodless chamber of the hydraulic cylinder 6, and is used for discharging the hydraulic oil in the rodless chamber of the hydraulic cylinder 6 or supplying oil to the rodless chamber of the hydraulic cylinder 6;

[0065] One end of the first overflow oil circuit is arranged on the first oil circuit and communicates with the rod chamber of the hydraulic cylinder 6, and the other end is communicated with the second oil circuit. A first overflow valve 5 is arranged on the first overflow oil circuit, and an oil inlet of the first overflow valve 5 is communicated with the first oil circuit, and an oil drain port of the first overflow valve 5 is communicated with the second oil circuit, for controlling the working pressure of the hydraulic cylinder 6 when oil is supplied from the first oil circuit to the rod chamber of the hydraulic cylinder 6;

[0066] The first hydraulically controlled one-way valve 3 is arranged on the first oil circuit, and the oil outlet of the first hydraulically controlled one-way valve 3 is respectively connected with the rod chamber of the hydraulic cylinder 6 and the first overflow oil circuit, and is used to separate the oil circuit when oil is supplied from the first oil circuit to the rod chamber of the hydraulic cylinder 6, so as to prevent the hydraulic oil from flowing back from the first oil circuit through the first hydraulically controlled one-way valve 3;

[0067] When oil is supplied from the first oil circuit to the rod chamber of the hydraulic cylinder 6, the load of the hydraulic cylinder 6 increases, and the working pressure of the hydraulic cylinder 6 increases. When the working pressure of the hydraulic cylinder 6 exceeds the maximum working pressure of the hydraulic cylinder 6, the hydraulic oil cannot flow back from the first oil circuit through the first hydraulically controlled one-way valve 3, and the first overflow valve 5 opens. Part of the hydraulic oil on the oil outlet side of the first hydraulically controlled one-way valve 3 overflows from the first overflow oil circuit through the first overflow valve 5, thereby maintaining the working pressure of the hydraulic cylinder 6 stable. In this embodiment, the opening pressure set by the first overflow valve 5 is the maximum working pressure of the hydraulic cylinder 6.

[0068] The first one-way throttle valve 1 is arranged in the first oil circuit, the oil inlet of the first one-way throttle valve 1 is communicated with the other end of the first oil circuit, and the oil outlet of the first one-way throttle valve 1 is communicated with the oil inlet of the first hydraulically controlled one-way valve 3, and is used to control the flow of the first oil circuit when the hydraulic oil flows from the first oil circuit to the rod chamber of the hydraulic cylinder 6, and the first one-way throttle valve 1 does not play a throttling role when the hydraulic oil in the rod chamber of the hydraulic cylinder 6 flows back from the first oil circuit;

[0069] When the hydraulic oil flows from the first oil circuit to the rod chamber of the hydraulic cylinder 6, the hydraulic oil generates pressure loss through the first one-way throttle valve 1, and then the pressure of the oil inlet of the first relief valve 5 is reduced, so that the first relief valve 5 controls the working pressure of the hydraulic cylinder 6 and maintains the working pressure of the hydraulic cylinder 6 stable.

[0070] The present application sets a first overflow oil circuit, sets a first overflow valve 5 on the first overflow oil circuit, sets a first hydraulically controlled one-way valve 3 and a first one-way throttle valve 1 on the first oil circuit. When oil is supplied from the first oil circuit to the rod chamber of the hydraulic cylinder 6, the working pressure of the hydraulic cylinder 6 is controlled by the first overflow valve 5, and the flow of the first oil circuit is controlled by the first one-way throttle valve 1 to meet the flow demand of the hydraulic cylinder 6. There is no need to set a separate hydraulic circuit for the hydraulic cylinder 6, thereby reducing the hydraulic circuits and hydraulic components set in the narrow space inside the excavator head replacement device, reducing the construction cost and failure rate, and facilitating maintenance.

[0071] The linkage control system of the hydraulic cylinder and the hydraulic motor further includes an oil return tank T, which is used to recover the hydraulic oil, prevent the hydraulic oil from being discharged and polluting the environment, and maintain the pressure balance of the linkage control system of the hydraulic cylinder and the hydraulic motor; the other end of the first oil circuit (i.e., the oil port A) and the other end of the second oil circuit (i.e., the oil port B) are usually selectively connected to the hydraulic oil source and the oil return tank T respectively through a two-position four-way control valve;

[0072] When the other end of the first oil circuit (i.e., oil port A) is connected to the hydraulic oil source and the other end of the second oil circuit (i.e., oil port B) is connected to the oil return tank T, the hydraulic oil source supplies oil from the first oil circuit to the rod chamber of the hydraulic cylinder 6, and the hydraulic oil in the rodless chamber of the hydraulic cylinder 6 flows from the second oil circuit into the oil return tank T, and the hydraulic cylinder rod retracts; when the other end of the second oil circuit (i.e., oil port B) is connected to the hydraulic oil source and the other end of the first oil circuit (i.e., oil port A) is connected to the oil return tank T, the hydraulic oil source supplies oil from the second oil circuit to the rodless chamber of the hydraulic cylinder 6, and the hydraulic oil in the rod chamber of the hydraulic cylinder 6 flows from the first oil circuit into the oil return tank T, and the hydraulic cylinder rod extends.

[0073] On the basis of the above technical solution, it is further preferred that the linkage control system of the hydraulic cylinder and the hydraulic motor also includes: a hydraulic motor 7 and a third oil circuit; the hydraulic motor 7 is arranged on the third oil circuit, one end of the third oil circuit is connected with the other end of the first oil circuit (i.e., oil port A), and the other end is connected with the return oil tank T, which is used to supply oil to the hydraulic motor 7, and the hydraulic oil in the hydraulic motor 7 flows from the third oil circuit into the return oil tank T; the oil inlet of the hydraulic motor 7 is connected with the other end of the first oil circuit (i.e., oil port A), and the oil return port of the hydraulic motor 7 is connected with the return oil tank T, which is used for the transmission of the chain of the excavator head replacement device.

[0074] More preferably, the linkage control system of the hydraulic cylinder and the hydraulic motor further includes a second overflow oil circuit, one end of the second overflow oil circuit is arranged on the first oil circuit, and is respectively connected to the oil outlet of the first one-way throttle valve 1 and the oil inlet of the first hydraulically controlled one-way valve 3, and the other end is connected to the second oil circuit, a second overflow valve 4 is arranged on the second overflow oil circuit, the oil inlet of the second overflow valve 4 is connected to the first oil circuit, and the oil drain port of the second overflow valve 4 is connected to the second oil circuit, which is used to control the working pressure of the hydraulic motor 7 and the hydraulic cylinder 6 when oil is supplied from the third oil circuit and the first oil circuit to the rod chambers of the hydraulic motor 7 and the hydraulic cylinder 6 respectively through the other end of the first oil circuit (i.e., the A oil port);

[0075] When oil is supplied to the hydraulic motor 7 from the third oil circuit through the other end of the first oil circuit (i.e., oil port A), the load of the hydraulic motor 7 increases and the working pressure of the hydraulic motor 7 increases. When the working pressure of the hydraulic motor 7 exceeds the maximum working pressure of the hydraulic motor 7, the second overflow valve 4 opens, and part of the hydraulic oil on the oil outlet side of the first one-way throttle valve 1 overflows from the second overflow oil circuit through the second overflow valve 4, and flows from the second oil circuit into the return oil tank T, thereby maintaining the working pressure of the hydraulic motor 7 stable. In this embodiment, the opening pressure set by the second overflow valve 4 is the maximum working pressure of the hydraulic motor 7.

[0076] When the hydraulic oil flows from the first oil circuit to the rod chamber of the hydraulic cylinder 6, the hydraulic oil generates pressure loss through the first one-way throttle valve 1, and then the pressure at the oil inlet of the second overflow valve 4 is reduced, which facilitates the second overflow valve 4 to control the working pressure of the hydraulic motor 7 and maintain the working pressure of the hydraulic motor 7 stable; part of the hydraulic oil on the oil outlet side of the first one-way throttle valve 1 overflows from the second overflow oil circuit through the second overflow valve 4, and then the pressure at the oil inlet of the first overflow valve 5 is further reduced, which facilitates the first overflow valve 5 to control the working pressure of the hydraulic cylinder 6 and maintain the working pressure of the hydraulic cylinder 6 stable.

[0077] In this embodiment, the opening pressure set at the second relief valve 4 is greater than the opening pressure set at the first relief valve 5 , and the working pressure of the hydraulic motor 7 is generally greater than the working pressure of the hydraulic cylinder 6 .

[0078] Furthermore, the control oil port of the first hydraulically controlled one-way valve 3 is connected to the second oil circuit, so that when oil is supplied from the second oil circuit to the rodless chamber of the hydraulic cylinder 6, the hydraulic oil in the rod chamber of the hydraulic cylinder 6 flows back from the first oil circuit through the first hydraulically controlled one-way valve 3;

[0079] When oil is supplied from the second oil circuit to the rodless chamber of the hydraulic cylinder 6, the control oil port of the first hydraulically controlled one-way valve 3 receives a pressure signal, the oil outlet and the oil inlet of the first hydraulically controlled one-way valve 3 are connected, and the hydraulic oil in the rod chamber of the hydraulic cylinder 6 flows from the first oil circuit into the return oil tank T through the first hydraulically controlled one-way valve 3.

[0080] More preferably, a second one-way throttle valve 2 is also provided in the first oil circuit, and the second one-way throttle valve 2 is connected in series with the first one-way throttle valve 1, and is used to control the flow of the first oil circuit when the hydraulic oil in the rod chamber of the hydraulic cylinder 6 flows back from the first oil circuit, and the second one-way throttle valve 2 does not play a throttling role when the hydraulic oil flows from the first oil circuit to the rod chamber of the hydraulic cylinder 6; in this embodiment, the retraction speed of the hydraulic cylinder rod is controlled by adjusting the first one-way throttle valve 1, and the extension speed of the hydraulic cylinder rod is controlled by adjusting the second one-way throttle valve 2; when the hydraulic oil in the rod chamber of the hydraulic cylinder 6 flows back from the first oil circuit, the hydraulic oil generates pressure loss through the second one-way throttle valve 2.

[0081] In this embodiment, the second one-way throttle valve 2 is arranged between the first hydraulically controlled one-way valve 3 and the first one-way throttle valve 1, the oil inlet of the second one-way throttle valve 2 is connected to the oil inlet of the first hydraulically controlled one-way valve 3, and the oil outlet of the second one-way throttle valve 2 is respectively connected to the oil outlet of the first one-way throttle valve 1 and the second overflow oil circuit.

[0082] More preferably, the second one-way throttle valve 2 is composed of a second one-way valve and a second throttle valve in parallel; the second one-way valve is used to prevent the hydraulic oil from flowing back from the first oil circuit through the second one-way valve when the hydraulic oil in the rod chamber of the hydraulic cylinder 6 is discharged, and the hydraulic oil flows from the first oil circuit to the rod chamber of the hydraulic cylinder 6 through the second one-way valve when the oil is supplied from the first oil circuit to the rod chamber of the hydraulic cylinder 6; the second throttle valve is used to control the flow rate of the first oil circuit when the hydraulic oil in the rod chamber of the hydraulic cylinder 6 flows back from the first oil circuit through the second throttle valve, and the second throttle valve does not perform a throttling effect when the hydraulic oil flows from the first oil circuit to the rod chamber of the hydraulic cylinder 6.

[0083] In this embodiment, the first one-way throttle valve 1 is composed of a first one-way valve and a first throttle valve in parallel; the first one-way valve is used to prevent the hydraulic oil from flowing from the first oil circuit to the rod chamber of the hydraulic cylinder 6 through the first one-way valve when oil is supplied from the first oil circuit to the rod chamber of the hydraulic cylinder 6, and when the hydraulic oil in the rod chamber of the hydraulic cylinder 6 is discharged, the hydraulic oil flows back from the first oil circuit through the first one-way valve; the first throttle valve is used to control the flow of the first oil circuit when the hydraulic oil flows from the first oil circuit to the rod chamber of the hydraulic cylinder 6 through the first throttle valve, and the first throttle valve does not perform a throttling effect when the hydraulic oil in the rod chamber of the hydraulic cylinder 6 flows back from the first oil circuit.

[0084] Furthermore, the linkage control system of the hydraulic cylinder and the hydraulic motor also includes a first oil drain circuit, and an oil drain port is provided on the housing of the hydraulic motor 7. One end of the first oil drain circuit is connected to the oil drain port of the hydraulic motor 7, and the other end is connected to the second oil circuit, which is used for draining the hydraulic oil in the housing of the hydraulic motor 7 when oil is supplied to the hydraulic motor 7 from the third oil circuit.

[0085] More preferably, a third one-way valve 13 is provided on the first oil drain circuit, the oil inlet of the third one-way valve 13 is connected with the oil drain port of the hydraulic motor 7, and the oil outlet of the third one-way valve 13 is connected with the second oil circuit, which is used to prevent the hydraulic oil from flowing from the first oil drain circuit into the housing of the hydraulic motor 7 through the third one-way valve 13 when oil is supplied from the second oil circuit to the rodless chamber of the hydraulic cylinder 6.

[0086] When oil is supplied from the third oil circuit to the hydraulic motor 7, the hydraulic oil in the housing of the hydraulic motor 7 is discharged from the first oil drain circuit through the third one-way valve 13, and flows into the return oil tank T from the second oil circuit; when oil is supplied from the second oil circuit to the rodless chamber of the hydraulic cylinder 6, the pressure of the second oil circuit is greater than the pressure of the oil drain port of the hydraulic motor 7, and the hydraulic oil in the housing of the hydraulic motor 7 cannot be discharged from the first oil drain circuit, and at the same time, the hydraulic oil in the second oil circuit cannot flow from the first oil drain circuit into the housing of the hydraulic motor 7 through the third one-way valve 13.

[0087] Furthermore, the linkage control system of the hydraulic cylinder and the hydraulic motor also includes a second oil drain circuit, one end of which is connected to the oil drain port of the hydraulic motor 7, and the other end is arranged on the third oil circuit and connected to the oil return port of the hydraulic motor 7, which is used for draining the hydraulic oil in the housing of the hydraulic motor 7 when oil is supplied from the second oil circuit to the rodless chamber of the hydraulic cylinder 6.

[0088] More preferably, a fourth one-way valve 12 is provided on the second oil drain circuit, the oil inlet of the fourth one-way valve 12 is connected to the oil drain port of the hydraulic motor 7, and the oil outlet of the fourth one-way valve 12 is connected to the third oil circuit, for preventing the hydraulic oil in the hydraulic motor 7 from flowing into the housing of the hydraulic motor 7 through the fourth one-way valve 12 from the second oil drain circuit when the hydraulic oil in the hydraulic motor 7 flows into the return oil tank T from the third oil circuit.

[0089] When oil is supplied from the third oil circuit to the hydraulic motor 7, the pressure at the return oil port of the hydraulic motor 7 is greater than the pressure at the drain oil port of the hydraulic motor 7, and the hydraulic oil in the housing of the hydraulic motor 7 cannot be drained from the second drain oil circuit. At the same time, the hydraulic oil in the third oil circuit cannot flow from the second drain oil circuit into the housing of the hydraulic motor 7 through the fourth one-way valve 12; when oil is supplied from the second oil circuit to the rodless chamber of the hydraulic cylinder 6, the hydraulic oil in the housing of the hydraulic motor 7 leaks from the second drain oil circuit through the fourth one-way valve 12 and flows into the return oil tank T from the third oil circuit.

[0090] Further preferably, the linkage control system of the hydraulic cylinder and the hydraulic motor also includes a chain lubricating oil circuit, one end of the chain lubricating oil circuit is connected to the oil drain port of the hydraulic motor 7, and the other end is a chain lubricating oil port 11, which is used to discharge the hydraulic oil in the housing of the hydraulic motor 7, and then lubricate the chain through the hydraulic oil discharged from the chain lubricating oil port 11.

[0091] In this embodiment, the linkage control system of the hydraulic cylinder and the hydraulic motor also includes a back pressure check valve 8 and a second hydraulically controlled check valve 9; the back pressure check valve 8 is arranged on the third oil circuit, the oil inlet of the back pressure check valve 8 is respectively connected to the oil return port of the hydraulic motor 7 and the second oil drain circuit, and the oil outlet of the back pressure check valve 8 is connected to the oil return tank T, so as to generate a pressure signal when the hydraulic oil passes through the back pressure check valve 8; the second hydraulically controlled check valve 9 is arranged on the chain lubrication oil circuit, and the first The oil inlet of the second hydraulically controlled one-way valve 9 is connected to the chain lubricating oil port 11, the oil outlet of the second hydraulically controlled one-way valve 9 is connected to the oil drain port of the hydraulic motor 7, the control oil port of the second hydraulically controlled one-way valve 9 is respectively connected to the second oil drain oil circuit and the oil outlet of the fourth one-way valve 12 on the second oil drain oil circuit, and then connected to the oil return port of the hydraulic motor 7 on the third oil circuit and the oil inlet of the back pressure one-way valve 8 through the second oil drain oil circuit, so as to control the on-off of the chain lubricating oil circuit.

[0092] When the hydraulic oil flows from the third oil circuit into the oil return tank T through the back pressure check valve 8, the back pressure check valve 8 opens to generate a pressure signal, the control oil port of the second hydraulically controlled check valve 9 receives the pressure signal, the oil outlet of the second hydraulically controlled check valve 9 is connected with the oil inlet of the second hydraulically controlled check valve 9, and the hydraulic oil in the housing of the hydraulic motor 7 flows into the chain lubricating oil circuit through the second hydraulically controlled check valve 9 and is discharged from the chain lubricating oil port 11 to lubricate the chain; when the back pressure check valve 8 is closed, the control oil port of the second hydraulically controlled check valve 9 does not receive a pressure signal, and the hydraulic oil in the housing of the hydraulic motor 7 cannot flow into the chain lubricating oil circuit through the second hydraulically controlled check valve 9.

[0093] In addition, a third throttle valve 10 is also provided on the chain lubricating oil circuit, and the oil inlet of the third throttle valve 10 is connected to the oil inlet of the second hydraulically controlled one-way valve 9, and the oil outlet of the third throttle valve 10 is connected to the chain lubricating oil port 11, which is used to control the flow of the chain lubricating oil circuit when the hydraulic oil in the housing of the hydraulic motor 7 leaks from the chain lubricating oil circuit, and further control the flow of the first oil leakage circuit or the second oil leakage circuit.

[0094] The utility model controls the working pressure of the hydraulic cylinder 6 through the first relief valve 5, controls the flow of the first oil circuit through the first one-way throttle valve 1, and controls the working pressure of the hydraulic motor 7 through the second relief valve 4. There is no need to set up separate hydraulic circuits for the hydraulic cylinder 6 and the hydraulic motor 7, respectively, thereby simplifying the hydraulic circuits and hydraulic components set up in the narrow space inside the excavator head replacement device, reducing the cost and failure rate, and facilitating maintenance.

[0095] Example 2

[0096] This embodiment is basically the same as Embodiment 1, except that:

[0097] like Figure 2 As shown, this embodiment provides a linkage control system of a hydraulic cylinder and a hydraulic motor, wherein the second one-way throttle valve 2 is arranged between the first hydraulically controlled one-way valve 3 and the first one-way throttle valve 1, the oil inlet of the second one-way throttle valve 2 is respectively connected to the oil inlet of the first hydraulically controlled one-way valve 3 and the second overflow oil circuit, and the oil outlet of the second one-way throttle valve 2 is connected to the oil outlet of the first one-way throttle valve 1.

[0098] Example 3

[0099] This embodiment is basically the same as Embodiment 1, except that:

[0100] like Figure 3As shown, this embodiment provides a linkage control system of a hydraulic cylinder and a hydraulic motor, wherein the second one-way throttle valve 2 is arranged between the first one-way throttle valve 1 and the other end of the first oil circuit (i.e., oil port A), the oil inlet of the second one-way throttle valve 2 is connected to the oil inlet of the first one-way throttle valve 1, and the oil outlet of the second one-way throttle valve 2 is connected to the other end of the first oil circuit (i.e., oil port A).

[0101] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A linkage control system for a hydraulic cylinder and a hydraulic motor, characterized in that: include: A hydraulic cylinder, a first oil circuit, a second oil circuit, a first overflow oil circuit, a first hydraulically controlled one-way valve and a first one-way throttle valve; One end of the first oil circuit is in communication with the rod chamber of the hydraulic cylinder, and is used to supply oil to the rod chamber of the hydraulic cylinder or discharge the hydraulic oil in the rod chamber of the hydraulic cylinder; One end of the second oil circuit is in communication with the rodless chamber of the hydraulic cylinder, and is used for discharging the hydraulic oil in the rodless chamber of the hydraulic cylinder or supplying oil to the rodless chamber of the hydraulic cylinder; One end of the first overflow oil circuit is arranged on the first oil circuit and communicates with the rod chamber of the hydraulic cylinder, and the other end is communicated with the second oil circuit. A first overflow valve is arranged on the first overflow oil circuit, an oil inlet of the first overflow valve is communicated with the first oil circuit, and an oil drain port of the first overflow valve is communicated with the second oil circuit, for controlling the working pressure of the hydraulic cylinder when oil is supplied from the first oil circuit to the rod chamber of the hydraulic cylinder; The first hydraulically controlled one-way valve is arranged on the first oil circuit, and the oil outlet of the first hydraulically controlled one-way valve is respectively connected with the rod chamber of the hydraulic cylinder and the first overflow oil circuit, and is used to separate the oil circuit when oil is supplied from the first oil circuit to the rod chamber of the hydraulic cylinder; The first one-way throttle valve is arranged in the first oil circuit, the oil inlet of the first one-way throttle valve is connected with the other end of the first oil circuit, and the oil outlet of the first one-way throttle valve is connected with the oil inlet of the first hydraulically controlled one-way valve, and is used to control the flow of the first oil circuit when the hydraulic oil flows from the first oil circuit to the rod chamber of the hydraulic cylinder, and the first one-way throttle valve does not play a throttling role when the hydraulic oil in the rod chamber of the hydraulic cylinder flows back from the first oil circuit.

2. The linkage control system of the hydraulic cylinder and the hydraulic motor according to claim 1, characterized in that: It also includes a return tank for recovering hydraulic oil; The other end of the first oil circuit and the other end of the second oil circuit can be selectively connected to the hydraulic oil source and the oil return tank respectively.

3. The linkage control system of the hydraulic cylinder and the hydraulic motor according to claim 2, characterized in that: Also includes: Hydraulic motor and third oil circuit; The hydraulic motor is arranged on the third oil circuit, one end of the third oil circuit is connected with the other end of the first oil circuit, and the other end is connected with the return oil tank, so as to supply oil to the hydraulic motor, and the hydraulic oil in the hydraulic motor flows from the third oil circuit into the return oil tank; The oil inlet of the hydraulic motor is communicated with the other end of the first oil circuit, and the oil return port of the hydraulic motor is communicated with the oil return tank for transmission.

4. The linkage control system of the hydraulic cylinder and the hydraulic motor according to claim 3, characterized in that: It also includes a second overflow oil circuit, one end of which is arranged on the first oil circuit and is respectively connected to the oil outlet of the first one-way throttle valve and the oil inlet of the first hydraulically controlled one-way valve, and the other end is connected to the second oil circuit. A second overflow valve is arranged on the second overflow oil circuit, the oil inlet of the second overflow valve is connected to the first oil circuit, and the oil drain port of the second overflow valve is connected to the second oil circuit, which is used to control the working pressure of the hydraulic motor and the hydraulic cylinder when oil is supplied to the rod chamber of the hydraulic motor and the hydraulic cylinder from the third oil circuit and the first oil circuit respectively through the other end of the first oil circuit.

5. The linkage control system of the hydraulic cylinder and the hydraulic motor according to claim 4, characterized in that: The opening pressure set for the second relief valve is greater than the opening pressure set for the first relief valve.

6. The linkage control system of the hydraulic cylinder and the hydraulic motor according to claim 1, characterized in that: The control oil port of the first hydraulically controlled one-way valve is connected to the second oil circuit, so that when oil is supplied from the second oil circuit to the rodless chamber of the hydraulic cylinder, the hydraulic oil in the rod chamber of the hydraulic cylinder flows back from the first oil circuit through the first hydraulically controlled one-way valve.

7. The linkage control system of the hydraulic cylinder and the hydraulic motor according to claim 1, characterized in that: A second one-way throttle valve is also arranged on the first oil circuit, and the second one-way throttle valve is connected in series with the first one-way throttle valve, and is used for controlling the flow of the first oil circuit when the hydraulic oil in the rod chamber of the hydraulic cylinder flows back from the first oil circuit, and the second one-way throttle valve does not play a throttling role when the hydraulic oil flows from the first oil circuit to the rod chamber of the hydraulic cylinder.

8. The linkage control system of the hydraulic cylinder and the hydraulic motor according to claim 7, characterized in that: The second one-way throttle valve is arranged between the first hydraulically controlled one-way valve and the first one-way throttle valve.

9. The linkage control system of the hydraulic cylinder and the hydraulic motor according to claim 7, characterized in that: The second one-way throttle valve is composed of a second one-way valve and a second throttle valve connected in parallel.

10. The linkage control system of the hydraulic cylinder and the hydraulic motor according to claim 1, characterized in that: The first one-way throttle valve is composed of a first one-way valve and a first throttle valve connected in parallel.

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