Temperature control one-way throttle valve, hydraulic system and excavator

Abstract

A temperature control one-way throttle valve (6), and a hydraulic system and an excavator equipped with the temperature control one-way throttle valve. The temperature control one-way throttle valve comprises a one-way valve and a temperature control throttle valve which are connected in parallel between a first oil port (A) and a second oil port (B) of the temperature control one-way throttle valve, wherein the temperature control throttle valve comprises a temperature control valve (65) and a throttle valve core (64), the temperature control valve being configured to drive the throttle valve core on the basis of a set temperature threshold value and enable the throttle valve core to operate in an initial position or in an operation position; when the throttle valve core operates in the initial position, the first oil port and the second oil port are in communication with each other by means of a direct-flow oil channel in the throttle valve core, with no damping effect; and when the throttle valve core operates in the operation position, the first oil port and the second oil port are in communication with each other by means of a throttle hole in the throttle valve core, with a damping effect, such that the problem of serious delay caused by the temperature of hydraulic oil being low can be avoided, and cylinder stop impact is also reduced.

Description

Temperature-controlled one-way throttle valve, hydraulic system and excavator Technical Field

[0001] The present invention belongs to the technical field of hydraulic valves, and in particular relates to a temperature-controlled one-way throttle valve, a hydraulic system and an excavator. Background Art

[0002] In an excavator's hydraulic system, the control oil circuit acts as a logic signal to constrain the output or input of the controlled components. For example, the magnitude of the pilot control signal controls the speed of the actuator, and the magnitude of the load feedback signal controls the displacement of the main pump. Generally speaking, due to inertia, the cylinder will produce shock when it stops. Therefore, to minimize shock during excavator commissioning, a common solution is to install a one-way throttle valve in the control oil circuit, utilizing the viscous resistance of the hydraulic oil to optimize and minimize shock.

[0003] Existing one-way throttle valves typically consist of a hydraulic valve composed of a parallel combination of a one-way valve and a fixed orifice. This solution, which dampens the hydraulic oil through the one-way throttle to mitigate hydraulic shock, is typically determined based on specific operating conditions, such as oil temperature and orifice size. Under varying operating conditions, particularly in cold weather, the overall machine's controllability can be severely affected, resulting in significant delays. Summary of the Invention

[0004] In order to solve the deficiencies in the prior art, the present invention provides a temperature-controlled one-way throttle valve, a hydraulic system and an excavator, which can reduce the impact of cylinder stop while avoiding the serious delay problem caused by low hydraulic oil temperature.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] In the first aspect, a temperature-controlled one-way throttle valve is provided, comprising: a one-way valve and a temperature-controlled throttle valve connected in parallel between a first oil port and a second oil port of the temperature-controlled one-way throttle valve; the temperature-controlled throttle valve comprises a temperature-controlled valve and a throttle valve core, the temperature-controlled valve is used to drive the throttle valve core according to a set temperature threshold, and to make the throttle valve core work in an initial position or a working position; when the throttle valve core works in the initial position, the first oil port and the second oil port are connected through a DC oil channel in the throttle valve core, and there is no damping effect; when the throttle valve core works in the working position, the first oil port and the second oil port are connected through a throttle hole in the throttle valve core, and there is a damping effect.

[0007] Furthermore, the temperature-controlled one-way throttle valve includes: a valve body having a valve cavity with a one-way opening and a valve cover connected to the valve body and sealing the valve cavity; the inner wall of the valve cavity is provided with a first annular groove and a second annular groove; the first annular groove is connected to the first oil port provided on the valve body, and the second annular groove is connected to the second oil port provided on the valve body; the throttle valve core is installed in the valve cavity, and one end of the throttle valve core is connected to the bottom of the valve cavity through the temperature-controlled valve, and the other end is connected to the valve cover through a second spring; the outer surface of the throttle valve core is provided with a first opening groove serving as the throttling hole and a second opening groove serving as the direct current oil channel.

[0008] Furthermore, the throttle valve core is provided with a temperature control valve seat for mounting the temperature control valve.

[0009] Furthermore, the length directions of the first opening groove and the second opening groove are respectively parallel to the axial direction of the throttle valve core, and the depth directions of the first opening groove and the second opening groove are respectively parallel to the radial direction of the cross section of the throttle valve core.

[0010] Furthermore, the one-way valve is integrated on the throttle valve core, and the throttle valve core is provided with a steel ball channel and a through channel connected to the steel ball channel, the steel ball channel is connected to the first annular groove through the first channel, and the through channel is connected to the second annular groove through the second channel; a plug is installed at one end of the steel ball channel, and the first spring and steel ball are sealed in the steel ball channel, one end of the first spring is connected to the plug, and the other end is connected to the steel ball, and the steel ball abuts against the connection between the steel ball channel and the through channel.

[0011] Furthermore, the axis of the through channel coincides with the axis of the steel ball channel, and the diameter of the through channel is smaller than the diameter of the steel ball channel, thereby forming a right-angle step for forming a sealing structure with the steel ball.

[0012] Furthermore, when the temperature of the hydraulic oil is lower than the temperature threshold set by the temperature control valve, the throttle valve core works in the initial position, and the hydraulic oil entering from the first oil port passes through the first annular groove, the second opening groove, and the second annular groove in sequence to enter the second oil port; the hydraulic oil entering from the second oil port is divided into two paths: one path passes through the second annular groove, the second opening groove, and the first annular groove to enter the first oil port; the other path passes through the second annular groove, the second channel, the through channel, the steel ball channel, the first channel, and the first annular groove to enter the first oil port.

[0013] Furthermore, when the temperature of the hydraulic oil is greater than or equal to the temperature threshold set by the temperature control valve, the throttle valve core works in the working position, and the hydraulic oil entering from the first oil port passes through the first annular groove, the first opening groove, and the second annular groove in sequence to enter the second oil port; the hydraulic oil entering from the second oil port is divided into two paths: one path passes through the second annular groove, the first opening groove, and the first annular groove to enter the first oil port; the other path passes through the second annular groove, the second channel, the through channel, the steel ball channel, the first channel, and the first annular groove to enter the first oil port.

[0014] In a second aspect, a hydraulic system is provided, wherein the hydraulic system is equipped with the temperature-controlled one-way throttle valve described in the first aspect.

[0015] Furthermore, it also includes a main pump, which transports the hydraulic oil in the oil tank to the oil cylinder through a multi-way valve. The pilot oil port of the multi-way valve is installed with the temperature-controlled one-way throttle valve, and the temperature-controlled one-way throttle valve is installed in the swing angle control oil circuit between the multi-way valve and the main pump.

[0016] According to a third aspect, an excavator is provided, wherein the excavator is equipped with the temperature-controlled one-way throttle valve according to the first aspect.

[0017] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: the present invention connects a one-way valve and a temperature-controlled throttle valve in parallel between the first oil port and the second oil port of the temperature-controlled one-way throttle valve; the temperature-controlled throttle valve includes a temperature-controlled valve and a throttle valve core, and the temperature-controlled valve is used to drive the throttle valve core according to a set temperature threshold, and make the throttle valve core work in an initial position or a working position; when the throttle valve core works in the initial position, the first oil port and the second oil port are connected through the DC oil channel in the throttle valve core, and there is no damping effect; when the throttle valve core works in the working position, the first oil port and the second oil port are connected through the throttle hole in the throttle valve core, and there is a damping effect; it can reduce the impact of the cylinder stop while avoiding the serious delay problem caused by the low temperature of the hydraulic oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] FIG1 is a schematic diagram of the working principle of a temperature-controlled one-way throttle valve provided by an embodiment of the present invention;

[0019] FIG2 is a schematic diagram showing the working principle of a hydraulic system equipped with the temperature-controlled one-way throttle valve shown in FIG1 according to an embodiment of the present invention;

[0020] 3 is a cross-sectional schematic diagram of a temperature-controlled one-way throttle valve according to an embodiment of the present invention (low temperature state);

[0021] FIG4 is a schematic cross-sectional view of a valve body of a temperature-controlled one-way throttle valve according to an embodiment of the present invention;

[0022] 5 is a schematic cross-sectional view of a throttle valve core of a temperature-controlled one-way throttle valve according to an embodiment of the present invention;

[0023] 6 is a schematic diagram of the three-dimensional structure of the throttle valve core of the temperature-controlled one-way throttle valve according to an embodiment of the present invention;

[0024] FIG7 is a schematic diagram of the hydraulic oil flow direction of the temperature-controlled one-way throttle valve at low temperatures in an embodiment of the present invention, wherein (a) shows the hydraulic oil flowing from the second oil port B to the first oil port A, and (b) shows the hydraulic oil flowing from the first oil port A to the second oil port B;

[0025] 8 is a cross-sectional schematic diagram of a first opening groove of a temperature-controlled one-way throttle valve at low temperature according to an embodiment of the present invention;

[0026] FIG9 is a schematic diagram of the hydraulic oil flow direction of the temperature-controlled one-way throttle valve at high temperature in an embodiment of the present invention, wherein (a) shows the hydraulic oil flowing from the second oil port B to the first oil port A, and (b) shows the hydraulic oil flowing from the first oil port A to the second oil port B;

[0027] 10 is a schematic cross-sectional view of the first opening groove of the temperature-controlled one-way throttle valve at high temperature according to an embodiment of the present invention;

[0028] In the figure: A, first oil port; B, second oil port; 1, oil cylinder; 2, multi-way valve; 4, main pump; 5, oil tank; 6, temperature-controlled one-way throttle valve; 61, steel ball; 62, first spring; 63, second spring; 64, throttle valve core; 640, temperature-controlled valve seat; 641, steel ball channel; 642, through channel; 643, first channel; 644, second channel; 645, first opening groove; 646, second opening groove; 647, right-angle step; 65, temperature-controlled valve; 66, plug; 67, valve body; 670, valve chamber; 671, second annular groove; 672, first annular groove; 673, annular boss; 68, valve cover. DETAILED DESCRIPTION

[0029] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention.

[0030] Example 1:

[0031] As shown in Figures 1 to 10, a temperature-controlled one-way throttle valve includes: a one-way valve and a temperature-controlled throttle valve connected in parallel between the first oil port A and the second oil port B of the temperature-controlled one-way throttle valve 6; the temperature-controlled throttle valve includes a temperature-controlled valve 65 and a throttle valve core 64, the temperature-controlled valve 65 is used to drive the throttle valve core 64 according to a set temperature threshold, and make the throttle valve core 64 work in an initial position or a working position; when the throttle valve core 64 works in the initial position, the first oil port A and the second oil port B are connected through the direct current oil channel in the throttle valve core 64, and there is no damping effect; when the throttle valve core 64 works in the working position, the first oil port A and the second oil port B are connected through the throttle hole in the throttle valve core 64, and there is a damping effect.

[0032] This invention automatically detects temperature and intelligently selects the appropriate throttle orifice, achieving the technical effect of no throttling at low temperatures and throttling at high temperatures. Specifically, under normal operating conditions (high temperatures), the oil's viscosity creates damping, mitigating hydraulic shock. However, under colder conditions, damping is eliminated, avoiding the severe delays and faults caused by increased low-temperature viscosity. This significantly reduces the effect of oil temperature on damping, enhancing the user experience of controllability.

[0033] As shown in Figure 1, at low temperatures, hydraulic oil flows from the second oil port B into the temperature-controlled one-way throttle valve 6. The hydraulic oil is divided into two paths: one path flows out of the first oil port A through the one-way valve, and the other path flows out of the first oil port A through the initial position of the throttle valve core 64 (no throttling effect). The entire process has no throttling effect. When hydraulic oil flows from the first oil port A into the temperature-controlled one-way throttle valve 6, due to the closed one-way valve, the hydraulic oil can only flow out of the second oil port B through the initial position of the throttle valve core 64 (no throttling effect). Therefore, whether the hydraulic oil flows from A to B or from B to A, the hydraulic oil does not achieve the throttling damping effect during the entire process.

[0034] When the temperature slowly rises and reaches the threshold set by the temperature control valve 65, the throttle valve core 64 is in the working position (throttling effect) under the action of the temperature control valve 65. At this time, hydraulic oil flows from the second oil port B into the temperature control one-way throttle valve 6. Due to the effect of throttling damping, the hydraulic resistance is greater than the resistance of the oil flowing through the one-way valve. Therefore, the hydraulic oil will flow out of the first oil port A through the one-way valve. When hydraulic oil flows from the first oil port A into the temperature control one-way throttle valve 6, due to the closed one-way valve, the hydraulic oil can only flow out of the second oil port B through the working position of the throttle valve core 64 (throttling effect). Due to the viscous resistance of the hydraulic oil, the hydraulic oil produces a certain damping effect. It can be seen that there is no damping effect when the hydraulic oil flows from B to A, but there is a throttling damping effect when the hydraulic oil flows from A to B.

[0035] As shown in Figure 2, a hydraulic system includes an oil cylinder 1, a multi-way valve 2, a main pump 4, an oil tank 5, and the temperature-controlled one-way throttle valve 6 shown in Figure 1. When the temperature is high, the temperature-controlled one-way throttle valve 6 is in the working position (with a throttling effect). The pilot oil pushes the valve core in the multi-way valve 2 through the temperature-controlled one-way throttle valve 6 to control its opening or closing; the valve core opens to generate a load signal, which is transmitted to the main pump 4 through the temperature-controlled one-way throttle valve 6 to control its swing angle to become larger or smaller, thereby controlling the flow of the main pump 4. When the pilot stops supplying oil, the valve core in the multi-way valve 2 returns to the middle position, but due to the damping effect of the temperature-controlled one-way throttle valve 6, the closing time of the valve core in the multi-way valve 2 becomes longer, thereby causing the oil cylinder 1 to stop slowly, thereby improving the hydraulic shock when the oil cylinder 1 stops. During this process, when the valve core in the multi-way valve 2 returns to the middle position, the load signal also becomes smaller at the same time. Due to the damping effect of the temperature-controlled one-way throttle valve 6, the time of reduction is prolonged, thereby slowly reducing the flow of the main pump 4, causing a delay, reducing the hydraulic shock of the main pump 4, and also improving the hydraulic shock of the cylinder 1 and the entire hydraulic system when it stops.

[0036] When the temperature is low, the temperature-controlled one-way throttle valve 6 is in the initial position. The pilot oil pushes the valve core in the multi-way valve 2 through the temperature-controlled one-way throttle valve 6, and the valve core opens to generate a load signal. This signal is transmitted to the swing angle of the main pump 4 through the temperature-controlled one-way throttle valve 6, and its size is controlled to control the flow of the main pump 4. When the pilot stops supplying oil, the valve core in the multi-way valve 2 returns to the middle position. However, since the temperature-controlled one-way throttle valve 6 has no throttling effect, the closing time of the valve core in the multi-way valve 2 will not become longer, so that the oil cylinder will not produce low-temperature delay phenomenon under low temperature conditions. In this process, when the valve core in the multi-way valve 2 returns to the middle position, the load signal also becomes smaller at the same time. Since the temperature-controlled one-way throttle valve 6 has no throttling effect, the flow of the main pump 4 responds relatively quickly, reducing the delay phenomenon.

[0037] As shown in Figures 3 to 6, the temperature-controlled one-way throttle valve includes a valve body 67 having a valve cavity 670 with a one-way opening and a valve cover 68 connected to the valve body 67 and sealing the valve cavity 670; the throttle valve core 64 is installed in the valve cavity 670, and one end of the throttle valve core 64 is connected to the bottom of the valve cavity 670 through the temperature-controlled valve 65, and the other end is connected to the valve cover through a second spring 63.

[0038] The valve body 67 includes a valve cavity 670, a first oil port A, and a second oil port B. The main structure of the valve cavity 670 is a cylindrical hole. The interior of the valve cavity 670 contains two adjacent annular grooves: a first annular groove 672 and a second annular groove 671, wherein the first annular groove 672 is connected to the first oil port A, and the second annular groove 671 is connected to the second oil port B; an annular boss 673 is formed between the first annular groove 672 and the second annular groove 671.

[0039] The throttle valve core 64 includes a temperature-controlled valve seat 640, a steel ball passage 641, a through-passage 642, a first passage 643, a second passage 644, a first opening slot 645, and a second opening slot 646. The temperature-controlled valve seat 640 is a cavity that can accommodate the temperature-controlled valve 65. The steel ball passage 641 is a cavity that can accommodate the steel ball 61. The first passage 643 connects to the steel ball passage 641, and the second passage 644 connects to the steel ball passage 641 through the through-passage 642. The diameter of the through-passage 642 is smaller than that of the steel ball passage 641, forming a right-angled step 647. A number of waist-shaped opening grooves of different depths and lengths are provided on the circumferential surface of the throttle valve core 64: a first opening groove 645 serving as a throttling hole and a second opening groove 646 serving as a direct oil channel. The length directions of the first opening groove 645 and the second opening groove 646 are respectively parallel to the axial direction of the throttle valve core 64, and the depth directions of the first opening groove 645 and the second opening groove 646 are respectively parallel to the radial direction of the cross section of the throttle valve core 64.

[0040] The temperature control valve 65 has at least two working states: low temperature and high temperature. The temperature control valve 65 is shortest at low temperature, and at this time, the throttle valve core 64 works in the initial position; and is longest at high temperature, and at this time, the temperature control valve 65 pushes the throttle valve core 64 to work in the working position.

[0041] The interior space formed by the valve body 67 and the valve cover 68 houses the temperature-controlled valve 65, the throttle valve core 64, and the second spring 63. One end of the temperature-controlled valve 65 is embedded in the temperature-controlled valve seat 640 within the throttle valve core 64, while the other end abuts the bottom end surface of the valve cavity 670 within the valve body 67. Under the preload of the second spring 63, the three components are tightly abutted against each other, preventing any relative spatial movement. A steel ball 61, a first spring 62, and a plug 66 are positioned within the throttle valve core 64. The plug 66 is rigidly connected to the throttle valve core 64, compressing the first spring 62 and generating a preload that pushes the steel ball 61 against the right-angled step 647 in the throttle valve core 64, sealing the through-channel 642 within the throttle valve core 64.

[0042] According to the above technical solution, the present invention sets the length of the temperature control valve itself corresponding to high and low temperatures; sets the size of the first opening groove 645 so that the oil is throttled; sets the size of the second opening groove 646 so that the oil is not throttled, and the first opening groove 645 and the second opening groove 646 set on the throttle valve core 64 are at different positions.

[0043] Under low-temperature conditions, the temperature control valve 65 operates in a low-temperature operating state (short-stroke state). The oil flow diagrams in the temperature-controlled one-way throttle valve 6 are shown in Figures 7 and 8 , with the throttle valve core 64 operating in the initial position. In Figure 8 , the first opening groove 645 cannot connect the first annular groove 672 and the second annular groove 671 , but the second opening groove 646 (not shown in Figure 8 ) can connect the first annular groove 672 and the second annular groove 671 .

[0044] The oil flows from the second oil port B to the first oil port A. The hydraulic oil flows from the second oil port B of the temperature-controlled one-way throttle valve 6 and enters the second annular groove 671 of the valve body 67. Then, it is divided into two paths: one path flows into the first annular groove 672 through the second opening groove 646; the other path passes through the second channel 644 and the through channel 642 to reach the end face of the steel ball 61. Because the force generated by the pressure of the hydraulic oil on the end face of the steel ball 61 is greater than the preload force of the first spring 62, the steel ball 61 is pushed open by the oil. After reaching the first channel 643, the hydraulic oil flows into the first annular groove 672 and finally flows out through the first oil port A. During this process, the hydraulic oil has no throttling damping phenomenon.

[0045] The oil flows from the first oil port A to the second oil port B. The hydraulic oil flows from the first oil port A of the temperature-controlled one-way throttle valve 6 and enters the first annular groove 672 of the valve body 67. It is then divided into two oil paths: one path passes through the first channel 643 and reaches the end face of the steel ball 61. Because the end face of the steel ball 61 is in close contact with the right-angle step 647, the oil is blocked and cannot flow. The oil can only flow into the second annular groove 671 through the second opening groove 646 and finally out through the second oil port B. Because the size of the second opening groove 646 is set so that the oil does not produce throttling, there is no throttling or damping in the entire process.

[0046] Under high temperature conditions, the thermostatic valve 65 operates in a high-temperature operating state (long stroke state). Due to the increased displacement, the throttle valve core 64 and all its internal components move toward the second spring 63. In this state, the communication between the first opening groove 645, the second opening groove 646 on the throttle valve core 64 and the first annular groove 672, the second annular groove 671 changes: under high temperature conditions, the first annular groove 672 and the second annular groove 671 communicate through the first opening groove 645. Under low temperature conditions, the first annular groove 672 and the second annular groove 671 communicate through the second opening groove 646.

[0047] The oil flow diagram of the temperature-controlled one-way throttle valve is shown in Figures 9 and 10.

[0048] The oil flows from the second oil port B to the first oil port A. The hydraulic oil flows from the second oil port B of the temperature-controlled one-way throttle valve 6 and enters the second annular groove 671 of the valve body 67. It is then divided into two paths: one path flows through the first opening groove 645 into the first annular groove 672, and the other path flows through the second channel 644 and the through channel 642 to the end face of the steel ball 61. Because the force generated by the pressure of the hydraulic oil on the end face of the steel ball 61 is greater than the preload force of the first spring 62, the steel ball 61 is pushed open by the oil. After reaching the first channel 643, the hydraulic oil flows into the first annular groove 672 and finally flows out through the first oil port A. During this process, there is no throttling damping phenomenon of the hydraulic oil.

[0049] The oil flows from the first oil port A to the second oil port B. The hydraulic oil flows from the first oil port A of the temperature-controlled one-way throttle valve 6 and enters the first annular groove 672 of the valve body 67. It is then divided into two oil paths: one path passes through the first channel 643 and reaches the end face of the steel ball 61. Because the end face of the steel ball 61 is in close contact with the right-angle step 647, the oil is blocked and cannot flow. The oil can only flow into the second annular groove 671 through the first opening groove 645 and finally out through the second oil port B. Because the size of the first opening groove 645 is set, the oil is throttled, and there is a damping phenomenon in the whole process.

[0050] The temperature-controlled one-way throttle valve and its hydraulic system provided by the present invention can generate throttling at low temperatures without generating throttling, but generate throttling at high temperatures. That is, under normal working conditions (high temperature), the viscosity of the oil is used to generate damping to improve hydraulic shock, while no damping is generated under low-temperature working conditions in cold weather, thereby avoiding serious delay failures caused by the increased viscosity of the oil at low temperatures.

[0051] Example 2:

[0052] Based on the temperature-controlled one-way throttle valve described in Example 1, this embodiment provides a hydraulic system, which is equipped with the temperature-controlled one-way throttle valve described in Example 1.

[0053] The hydraulic system also includes a main pump 4, which transports the hydraulic oil in the oil tank 5 to the oil cylinder 1 through the multi-way valve 2. The pilot oil port of the multi-way valve 2 is installed with a temperature-controlled one-way throttle valve 6, and the temperature-controlled one-way throttle valve 6 is installed in the swing angle control oil circuit between the multi-way valve 2 and the main pump 4.

[0054] Example 3:

[0055] Based on the temperature-controlled one-way throttle valve described in Example 1 and the hydraulic system described in Example 2, this embodiment provides an excavator, which is equipped with the temperature-controlled one-way throttle valve described in Example 1 or the hydraulic system described in Example 2.

[0056] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A temperature-controlled one-way throttle valve, characterized in that: include: A one-way valve and a temperature-controlled throttle valve connected in parallel between a first oil port (A) and a second oil port (B) of the temperature-controlled one-way throttle valve (6); The temperature-controlled throttle valve comprises a temperature-controlled valve (65) and a throttle valve core (64), wherein the temperature-controlled valve (65) is used to drive the throttle valve core (64) according to a set temperature threshold value, and to make the throttle valve core (64) work in an initial position or a working position; When the throttle valve core (64) is operating in the initial position, the first oil port (A) and the second oil port (B) are connected through the direct flow oil passage in the throttle valve core (64), and there is no damping effect; When the throttle valve core (64) is working in the working position, the first oil port (A) and the second oil port (B) are connected through the throttle hole in the throttle valve core (64), which has a damping effect.

2. The temperature-controlled one-way throttle valve according to claim 1, characterized in that: The temperature-controlled one-way throttle valve comprises: a valve body (67) having a valve cavity (670) with a one-way opening, and a valve cover (68) connected to the valve body (67) and sealing the valve cavity (670); the inner wall of the valve cavity (670) is provided with a first annular groove (672) and a second annular groove (671); the first annular groove (672) is communicated with the first oil port (A) provided on the valve body (67), and the second annular groove (671) is communicated with the second oil port (B) provided on the valve body (67); The throttle valve core (64) is installed in the valve cavity (670), and one end of the throttle valve core (64) is connected to the bottom of the valve cavity (670) through the temperature control valve (65), and the other end is connected to the valve cover through the second spring (63); The outer surface of the throttle valve core (64) is provided with a first opening groove (645) serving as the throttle hole and a second opening groove (646) serving as the direct oil passage.

3. The temperature-controlled one-way throttle valve according to claim 2, characterized in that: The throttle valve core (64) is provided with a temperature control valve seat (640) for mounting the temperature control valve (65).

4. The temperature-controlled one-way throttle valve according to claim 2, characterized in that: The length directions of the first opening groove (645) and the second opening groove (646) are respectively parallel to the axial direction of the throttle valve core (64), and the depth directions of the first opening groove (645) and the second opening groove (646) are respectively parallel to the radial direction of the cross section of the throttle valve core (64).

5. The temperature-controlled one-way throttle valve according to claim 2, characterized in that: The one-way valve is integrated on the throttle valve core (64). The throttle valve core (64) is provided with a steel ball channel (641) and a through channel (642) connected to the steel ball channel (641). The steel ball channel (641) is connected to the first annular groove (672) through the first channel (643), and the through channel (642) is connected to the second annular groove (671) through the second channel (644). A plug (66) is installed at one end of the steel ball channel (641) and blocks the first spring (62) and the steel ball (61) in the steel ball channel (641). One end of the first spring (62) is connected to the plug (66), and the other end is connected to the steel ball (61). The steel ball (61) abuts against the connection between the steel ball channel (641) and the through channel (642).

6. The temperature-controlled one-way throttle valve according to claim 5, characterized in that: The through channel (642) coincides with the axis of the steel ball channel (641), and the diameter of the through channel (642) is smaller than the diameter of the steel ball channel (641), thereby forming a right-angle step (647) for forming a sealing structure with the steel ball (61).

7. The temperature-controlled one-way throttle valve according to claim 5, characterized in that: When the temperature of the hydraulic oil is lower than the temperature threshold value set by the temperature control valve (65), the throttle valve core (64) operates in the initial position, and the hydraulic oil entering from the first oil port (A) enters the second oil port (B) in sequence through the first annular groove (672), the second opening groove (646), and the second annular groove (671); the hydraulic oil entering from the second oil port (B) is divided into two paths: one path enters the first oil port (A) through the second annular groove (671), the second opening groove (646), and the first annular groove (672); the other path enters the first oil port (A) through the second annular groove (671), the second channel (644), the through channel (642), the steel ball channel (641), the first channel (643), and the first annular groove (672).

8. The temperature-controlled one-way throttle valve according to claim 5, characterized in that: When the temperature of the hydraulic oil is greater than or equal to the temperature threshold value set by the temperature control valve (65), the throttle valve core (64) works in the working position, and the hydraulic oil entering from the first oil port (A) enters the second oil port (B) in sequence through the first annular groove (672), the first opening groove (645), and the second annular groove (671); the hydraulic oil entering from the second oil port (B) is divided into two paths: one path enters the first oil port (A) through the second annular groove (671), the first opening groove (645), and the first annular groove (672); the other path enters the first oil port (A) through the second annular groove (671), the second channel (644), the through channel (642), the steel ball channel (641), the first channel (643), and the first annular groove (672).

9. A hydraulic system, characterized in that: The hydraulic system is equipped with a temperature-controlled one-way throttle valve (6) according to any one of claims 1 to 8.

10. The hydraulic system according to claim 7, characterized in that The invention also includes a main pump (4), which delivers the hydraulic oil in the oil tank (5) to the oil cylinder (1) through the multi-way valve (2), the pilot oil port of the multi-way valve (2) is equipped with the temperature-controlled one-way throttle valve (6), and the temperature-controlled one-way throttle valve (6) is installed in the swing angle control oil circuit between the multi-way valve (2) and the main pump (4).

11. An excavator, characterized in that: The excavator is equipped with a temperature-controlled one-way throttle valve (6) according to any one of claims 1 to 8.

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