Integrated valve group

Abstract

The present invention relates to an integrated valve group, comprising a first valve block, a second valve block, a first speed limiting valve, and a second speed limiting valve. The first valve block has a first connection port and a first oil outlet connected to a first oil cylinder, and a first oil outlet path is provided between the first oil outlet and the first connection port. The second valve block has an oil return port, a second connection port capable of connecting to the first connection port, and a second oil outlet connected to a second oil cylinder, and a second oil outlet path is provided between the second oil outlet and the second connection port, and an oil return path is provided between the second connection port and the oil return port. The first speed limiting valve and the second speed limiting valve are respectively provided in the first oil outlet path and the second oil outlet path. The first speed limiting valve and the second speed limiting valve can respectively control the descending speed of the first oil cylinder and the second oil cylinder, thereby ensuring that the overall volume of the integrated valve group is small while avoiding excessive pressure loss inside the first valve block or the second valve block, thereby ensuring that the first oil cylinder and the second oil cylinder can both descend at a stable and uniform speed.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic valve bodies, and in particular to an integrated valve group. Background Art

[0002] Scissor-type aerial platforms and other mechanical equipment usually use integrated valve groups to control the lifting and lowering cylinders during the lifting process. In existing integrated valve groups, in order to ensure that the cylinders can descend smoothly, a more complex compensation mechanism is usually required, which results in a larger valve body.

[0003] Furthermore, the existing integrated valve group may cause poor stability of the entire valve body when controlling two oil cylinders at the same time. Summary of the Invention

[0004] Based on this, it is necessary to provide an integrated valve group to address the above problems. The integrated valve group can control the stable descent of the two oil cylinders while ensuring the overall structure of the valve body is simple and the volume is small.

[0005] The present invention provides an integrated valve group including: a first valve block, having a first connecting port and a first oil outlet connected to a first oil cylinder, a first oil outlet passage being provided between the first oil outlet and the first connecting port; a second valve block, having an oil return port, a second connecting port capable of connecting to the first connecting port, and a second oil outlet connected to a second oil cylinder, a second oil outlet passage being provided between the second oil outlet and the second connecting port, and an oil return passage being provided between the second connecting port and the return port; a first speed limiting valve and a second speed limiting valve being respectively provided on the first oil outlet passage and the second oil outlet passage.

[0006] The above-mentioned integrated valve group, the first oil outlet and the second oil outlet can be connected to the first oil cylinder and the second oil cylinder respectively, and the descending speed of the first oil cylinder and the second oil cylinder can be controlled by the first speed limiting valve and the second speed limiting valve respectively, so as to ensure that the overall volume of the integrated valve group is small while avoiding excessive pressure loss inside the first valve block or the second valve block, thereby ensuring smooth circulation of pressurized oil in the first oil outlet path and the second oil outlet path, and both the first oil cylinder and the second oil cylinder can descend stably; at the same time, since the first valve block and the second valve block are arranged separately, when the oil circuit inside the valve body is blocked or the component is damaged, they can be repaired or replaced separately, thereby reducing costs and improving work efficiency; the first speed limiting valve and the second speed limiting valve can adjust the working flow as needed, thereby expanding the scope of use of the integrated valve group.

[0007] In one embodiment, the working flow rates in the first speed limiting valve and the second speed limiting valve are equal.

[0008] Such an arrangement can control the first oil cylinder and the second oil cylinder to descend synchronously, thereby improving the stability of the mechanical tool during the descent process.

[0009] In one embodiment, the integrated valve assembly further includes a transition piece disposed between the first valve block and the second valve block, and the transition piece is capable of sealingly connecting the first connection port and the second connection port.

[0010] With this arrangement, the adapter can ensure the sealing between the first connection port and the second connection port, preventing the pressure oil from leaking when passing through the first connection port and the second connection port. At the same time, the adapter can also facilitate the user to disassemble the first valve block and the second valve block.

[0011] In one embodiment, the integrated valve group further includes a solenoid valve provided in the oil return line, and the solenoid valve is used to control the on-off of the oil return line.

[0012] With such an arrangement, the solenoid valve can prevent the first oil cylinder and the second oil cylinder from falling due to gravity or external force, thereby ensuring the stability and safety of the mechanical device.

[0013] In one embodiment, the first valve block further has a first oil inlet, and a first oil inlet path is provided between the first oil inlet and the first oil outlet; the second valve block further has a second oil inlet, and a second oil inlet path is provided between the second oil inlet and the second oil outlet.

[0014] With this arrangement, when the first oil cylinder rises, the pressurized oil passes through the first oil inlet and the first oil inlet path from the first oil inlet and then enters the first oil cylinder through the first oil outlet; when the second oil cylinder rises, the pressurized oil passes through the second oil inlet and the second oil outlet from the second oil inlet.

[0015] In one embodiment, the integrated valve group further includes a first one-way valve arranged on the first oil outlet line; and / or the integrated valve group further includes a second one-way valve arranged on the first oil inlet line and a third one-way valve arranged on the second oil inlet line.

[0016] With such arrangement, the first one-way valve can ensure that the pressurized oil can only flow from the first oil outlet through the first connecting port and the second connecting port to the second oil outlet, thereby preventing the oil in the second oil outlet from flowing to the first oil outlet, and avoiding damage to the first valve block due to excessive internal oil pressure; the second one-way valve can ensure that the pressurized oil in the first oil inlet can only flow from the first oil inlet to the first oil outlet, thereby avoiding the pressurized oil in the first oil cylinder from decreasing by returning oil through the first oil inlet; the third one-way valve can ensure that the pressurized oil in the second oil inlet can only flow from the second oil inlet to the second oil outlet, thereby avoiding the pressurized oil in the second oil cylinder from decreasing by returning oil through the second oil inlet.

[0017] In one embodiment, a safety oil circuit communicating with the second oil inlet and the oil return port is further provided in the second valve block, and the integrated valve group further includes a relief valve provided on the safety oil circuit.

[0018] With this arrangement, when the pressure of the pressurized oil in the safety oil circuit reaches the overflow pressure, the overflow valve opens to achieve overflow, thereby protecting the integrated valve group.

[0019] In one embodiment, the first speed limiting valve and the second speed limiting valve both include a valve sleeve, a cavity is axially opened in the valve sleeve, and the cavity has an inlet and an outlet; the first speed limiting valve and the second speed limiting valve also include a valve core slidably arranged in the cavity, and the valve core can adjust the opening of the outlet.

[0020] With this arrangement, when the flow rate of the pressure oil at the inlet is large, the pressure oil can push the valve core to slide toward the outlet. At this time, the opening of the outlet is reduced, thereby ensuring that the flow rate of the pressure oil through the outlet remains unchanged.

[0021] In one embodiment, the outlet includes a first outlet and a second outlet, the first outlet is opened at one end of the valve sleeve along the axial direction of the valve sleeve, and the second outlet is opened at the side wall of the valve sleeve along the radial direction of the valve sleeve; the opening of the second outlet can be adjusted when the valve core slides.

[0022] With this arrangement, the first outlet is always in an open state. When the valve core is located closest to the inlet, the opening of the second outlet is the largest. When the valve core gradually slides toward the side close to the first outlet, the opening of the second outlet gradually decreases until the second outlet is completely closed.

[0023] In one embodiment, a channel is opened in the valve core along the axial direction, and the first speed limiting valve and the second speed limiting valve further include a throttling plug arranged in the channel, and a throttling hole is opened in the throttling plug along the axial direction.

[0024] With this arrangement, the throttle hole can throttle the pressure oil. Since the inner diameter of the throttle hole is small, the pressure exerted by the pressure oil at the inlet on the side of the valve core close to the inlet can be increased sufficiently to ensure that the pressure oil can push the valve core. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the conventional technology, the following briefly introduces the drawings required for use in the embodiments or the conventional technology descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 This is a schematic diagram of an integrated valve group according to an embodiment of the present invention;

[0027] Figure 2 This is a schematic structural diagram of a first valve block according to an embodiment of the present invention;

[0028] Figure 3 A partial cross-sectional view of the first valve block provided by the present invention at another angle;

[0029] Figure 4 The present invention provides Figure 3 Cross-sectional view at aa in the middle;

[0030] Figure 5 The present invention provides Figure 3 The enlarged image of point b in the middle;

[0031] Figure 6 This is a schematic structural diagram of a second valve block according to an embodiment of the present invention;

[0032] Figure 7 The present invention provides Figure 6 Rear view;

[0033] Figure 8 The present invention provides Figure 6 Right view of .

[0034] Reference numerals: 1, first valve block; 11, first oil outlet; 12, first oil inlet; 2, second valve block; 21, second oil outlet; 22, oil return; 23, second oil inlet; 24, safety oil circuit; 31, first speed limiting valve; 32, second speed limiting valve; 301, valve sleeve; 3011, cavity; 3012, inlet; 3013, outlet; 30131, first outlet; 30132, second outlet; 302, valve core; 30 21. Channel; 303. Throttle plug; 3031. Throttle hole; 304. Elastic member; 4. Adapter; 5. Solenoid valve; 61. First one-way valve; 62. Second one-way valve; 63. Third one-way valve; 7. Overflow valve; 81. First oil cylinder; 82. Second oil cylinder; P1. First oil inlet; P2. Second oil inlet; T. Oil return port; C1. First connecting port; C2. Second connecting port; A. First oil outlet; B. Second oil outlet. DETAILED DESCRIPTION

[0035] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0036] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of this application are for illustrative purposes only and do not represent the only implementation method.

[0037] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0038] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it can mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are indirectly in contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it can mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is higher in level than the second feature. When a first feature is "below," "below," or "below" a second feature, it can mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is lower in level than the second feature.

[0039] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more of the relevant listed items.

[0040] Scissor-type aerial platforms and other mechanical equipment often utilize integrated valve blocks to control the lifting and lowering cylinders during the lifting process. To ensure smooth descent of the cylinders, some existing integrated valve blocks employ complex compensation mechanisms, which results in a larger valve body and poor stability during descent. Other integrated valve blocks employ speed limiting valves, but these can lead to excessive pressure drop within the valve body when controlling two cylinders simultaneously, resulting in poor stability during descent.

[0041] In order to solve the above problems, Figures 1 to 8 As shown, the present invention provides an integrated valve group, which can control the stable descent of two oil cylinders while ensuring the simplicity of the overall structure and small size of the valve body.

[0042] like Figure 1 As shown, specifically, the integrated valve group includes a first valve block 1, a second valve block 2, a first speed limiting valve 31 and a second speed limiting valve 32. The first valve block 1 has a first connecting port C1 and a first oil outlet A connected to the first oil cylinder 81, and a first oil outlet path 11 is provided between the first oil outlet A and the first connecting port C1; the second valve block 2 has an oil return port T, a second connecting port C2 capable of communicating with the first connecting port C1 and a second oil outlet connected to the second oil cylinder 82, a second oil outlet path 21 is provided between the second oil outlet and the second connecting port C2, and an oil return path 22 is provided between the second connecting port C2 and the return oil port T; the first speed limiting valve 31 and the second speed limiting valve 32 are respectively arranged on the first oil outlet path 11 and the second oil outlet path 21.

[0043] When the first oil cylinder 81 descends, the pressurized oil enters the first oil outlet path 11 of the first valve block 1 through the first oil outlet port A, then enters the oil return path 22 of the second valve block 2 through the first connection port C1 and the second connection port C2, and finally returns through the oil return port T. The first rate limiting valve 31 controls the flow rate of the pressurized oil through the first oil outlet path 11, thereby controlling the descending speed of the first oil cylinder 81. When the second oil cylinder 82 descends, the pressurized oil enters the second oil outlet path 21 of the second valve block 2 through the second oil outlet port B, then returns through the oil return path 22 through the oil return port T. The second rate limiting valve 32 controls the flow rate of the pressurized oil through the second oil outlet path 21, thereby controlling the descending speed of the second oil cylinder 82.

[0044] As mentioned above, some integrated valve groups use speed limiting valves to ensure that the oil cylinders can descend smoothly. However, when the speed limiting valve controls two oil cylinders at the same time, it may further cause excessive pressure loss inside the valve body, resulting in poor stability when the two oil cylinders descend. In the integrated valve group provided in the embodiment of the present invention, the first oil outlet A and the second oil outlet B can be connected to the first oil cylinder 81 and the second oil cylinder 82, respectively, and the descending speeds of the first oil cylinder 81 and the second oil cylinder 82 can be controlled by the first speed limiting valve 31 and the second speed limiting valve 32, respectively. This can ensure that the overall volume of the integrated valve group is small while avoiding excessive pressure loss inside the first valve block 1 or the second valve block 2, thereby ensuring smooth flow of pressurized oil in the first oil outlet 11 and the second oil outlet 21, and both the first oil cylinder 81 and the second oil cylinder 82 can descend at a stable and uniform speed.

[0045] Furthermore, because the first and second valve blocks 1 and 2 are separate, they can be repaired or replaced independently if the oil circuits within the valve bodies become clogged or components become damaged, reducing costs and improving efficiency. The first and second rate limiting valves 31 and 32 can also adjust the flow rate as needed, expanding the range of applications for the integrated valve assembly.

[0046] In one embodiment, the operating flow rates within the first and second speed limiting valves 31, 32 are equal. This allows the first and second oil cylinders 81, 82 to descend synchronously, thereby improving the stability of a mechanical device such as a scissor-type aerial platform during descent. Of course, in other embodiments, the first and second oil cylinders 81, 82 can also be used to tilt the mechanical device or operate other functional attachments. In this case, the operating flow rates within the first and second speed limiting valves 31, 32 can also be set to different flow rates as needed, thereby controlling the asynchronous movement of the first and second oil cylinders 81, 82 to achieve the desired action.

[0047] like Figure 1 As shown, the first valve block 1 further has a first oil inlet P1, with a first oil inlet passage 12 disposed between the first oil inlet P1 and the first oil outlet A. The second valve block 2 further has a second oil inlet P2, with a second oil inlet passage 23 disposed between the second oil inlet P2 and the second oil outlet. When the first oil cylinder 81 ascends, pressurized oil flows from the first oil inlet P1 through the first oil inlet passage 12, and then enters the first oil cylinder 81 through the first oil outlet A. When the second oil cylinder 82 ascends, pressurized oil flows from the second oil inlet P2 through the second oil inlet passage 23, and then enters the second oil cylinder 82 through the second oil outlet B.

[0048] like Figure 1As shown, the integrated valve assembly also includes a first one-way valve 61 disposed in the first oil outlet 11. The first one-way valve 61 ensures that pressurized oil can only flow from the first oil outlet 11 through the first connection port C1 and the second connection port C2 to the second oil outlet 21. This prevents oil in the second oil outlet 21 from flowing into the first oil outlet 11, thus preventing damage to the first valve block 1 due to excessive internal oil pressure, thereby protecting the first valve block 1. The first one-way valve 61 also blocks the rise of the first and second oil cylinders 81, 82, allowing the first and second oil inlets P1, P2, to supply oil to the first and second cylinders 81, 82, respectively.

[0049] The integrated valve assembly also includes a second one-way valve 62 disposed on the first oil inlet line 12 and a third one-way valve 63 disposed on the second oil inlet line 23. The second one-way valve 62 ensures that the pressurized oil in the first oil inlet line 12 can only flow from the first oil inlet port P1 to the first oil outlet port A, thereby preventing the first oil cylinder 81 from descending due to gravity or external forces causing the pressurized oil to return through the first oil inlet line 12. The third one-way valve 63 ensures that the pressurized oil in the second oil inlet line 23 can only flow from the second oil inlet port P2 to the second oil outlet port B, thereby preventing the second oil cylinder 82 from descending due to gravity or external forces causing the pressurized oil to return through the second oil inlet line 23, thereby ensuring the stability and safety of the mechanical device.

[0050] like Figure 4 As shown, the integrated valve assembly also includes an adapter 4 disposed between the first valve block 1 and the second valve block 2. The adapter 4 can sealably connect the first connection port C1 and the second connection port C2. The adapter 4 ensures a tight seal between the first connection port C1 and the second connection port C2, preventing leakage of pressurized oil as it passes through the first connection port C1 and the second connection port C2. The adapter 4 also facilitates disassembly of the first valve block 1 and the second valve block 2, preventing the two valve bodies from being directly connected by gluing or other means, which can make disassembly difficult or easily damage internal components during disassembly.

[0051] like Figure 1 and Figure 6 As shown, the integrated valve assembly also includes a solenoid valve 5 disposed in the oil return line 22, which is used to control the opening and closing of the oil return line 22. In the illustrated embodiment, the solenoid valve 5 is a two-position solenoid valve, with a reverse check valve disposed in the first position and a second position connected to the oil return line 22. When the solenoid valve 5 is de-energized, the reverse check valve disconnects the oil return line 22, preventing the first and second oil cylinders 81, 82 from descending due to gravity or external forces, thereby ensuring the stability and safety of the mechanical device. When the first and second oil cylinders 81, 82 need to descend to return oil, the solenoid valve 5 is energized, connecting the oil return line 22.

[0052] like Figure 1 and Figure 8As shown, the second valve block 2 also has a safety oil circuit 24 connecting the second oil inlet P2 and the oil return port T. The integrated valve assembly also includes a relief valve 7 disposed on the safety oil circuit 24. When the pressure of the pressurized oil in the safety oil circuit 24 reaches the relief pressure, the relief valve 7 opens to allow overflow. This prevents the oil pump's oil supply from exceeding the required oil flow of the integrated valve assembly, resulting in excessive pressure and damage to the integrated valve assembly, thereby protecting the integrated valve assembly. In the illustrated embodiment, the relief valve 7 opens when the pressure in the safety oil circuit 24 reaches 18 MPa.

[0053] like Figure 2 and Figure 5 As shown, both the first and second speed limiting valves 31 and 32 include a valve sleeve 301, which defines an axially defined cavity 3011 within the sleeve. The cavity 3011 has an inlet 3012 and an outlet 3013. The first and second speed limiting valves 31 and 32 also include a valve core 302 slidably disposed within the cavity 3011, capable of adjusting the opening of the outlet 3013. An elastic member 304 is axially disposed between the valve core 302 and the inner wall of the cavity 3011. The elastic member 304 exerts an elastic force away from the valve core 302. The elastic member 304 may be a spring or other elastic element, without specific limitation herein.

[0054] When the flow rate of pressurized oil at inlet 3012 is high, and the pressure exerted by the pressurized oil on valve core 302 is greater than the elastic force exerted by elastic member 304 on valve core 302, the pressurized oil can push valve core 302 to slide toward outlet 3013. At this time, the opening of outlet 3013 decreases, thereby ensuring that the flow rate of pressurized oil through outlet 3013 remains constant. In the illustrated embodiment, both the first and second speed limiting valves 31 and 32 can control the flow rate of pressurized oil through outlet 3013 to 6.5 L / min. Of course, in other embodiments, the first and second speed limiting valves 31 and 32 can also control the flow rate of pressurized oil through outlet 3013 to be faster or slower.

[0055] Specifically, if Figure 5 As shown, the outlet 3013 includes a first outlet 30131 and a second outlet 30132. The first outlet 30131 is axially disposed at one end of the valve sleeve 301, while the second outlet 30132 is radially disposed on the sidewall of the valve sleeve 301. The opening of the second outlet 30132 can be adjusted as the valve core 302 slides. The first outlet 30131 is always open, with the outer circumferential wall of the valve core 302 in contact with the inner circumferential wall of the cavity 3011. When the valve core 302 is closest to the inlet 3012, the second outlet 30132 is at its maximum opening. As the valve core 302 gradually slides toward the first outlet 30131, the opening of the second outlet 30132 gradually decreases until it is fully closed.

[0056] A passage 3021 is axially defined within the valve core 302. The first and second speed limiting valves 31 and 32 also include a throttle plug 303 disposed within the passage 3021. A throttle hole 3031 is axially defined within the throttle plug 303. The throttle hole 3031 throttles the pressurized oil. Due to the small inner diameter of the throttle hole 3031, the pressure exerted by the pressurized oil at the inlet 3012 on the side of the valve core 302 closest to the inlet 3012 is sufficiently high, ensuring that the pressurized oil can push the valve core 302.

[0057] The opening degree refers to the degree of opening of the second outlet 30132, which can directly affect the flow rate of the pressurized oil.

[0058] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0059] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of patent protection for the present application shall be determined by the appended claims.

Claims

1. An integrated valve group, characterized in that: include: A first valve block (1) has a first connecting port (C1) and a first oil outlet (A) communicating with a first oil cylinder (81), and a first oil outlet passage (11) is provided between the first oil outlet (A) and the first connecting port (C1); A second valve block (2) has an oil return port (T), a second connecting port (C2) capable of communicating with the first connecting port (C1), and a second oil outlet port communicating with a second oil cylinder (82); a second oil outlet path (21) is provided between the second oil outlet port and the second connecting port (C2); and an oil return path (22) is provided between the second connecting port (C2) and the oil return port (T); A first speed limiting valve (31) and a second speed limiting valve (32) are respectively provided on the first oil outlet passage (11) and the second oil outlet passage (21); The first valve block (1) and the second valve block (2) are detachably connected, and the integrated valve group further comprises a transition piece (4) arranged between the first valve block (1) and the second valve block (2), and the transition piece (4) is capable of sealingly connecting the first connection port (C1) and the second connection port (C2).

2. The integrated valve group according to claim 1, characterized in that: The working flow rates in the first speed limiting valve (31) and the second speed limiting valve (32) are equal.

3. The integrated valve group according to claim 1, characterized in that: The integrated valve group further includes a solenoid valve (5) provided on the oil return line (22), and the solenoid valve (5) is used to control the on-off of the oil return line (22).

4. The integrated valve group according to claim 1, characterized in that: The first valve block (1) further comprises a first oil inlet (P1), and a first oil inlet passage (12) is provided between the first oil inlet (P1) and the first oil outlet (A); The second valve block (2) also has a second oil inlet (P2), and a second oil inlet passage (23) is provided between the second oil inlet (P2) and the second oil outlet.

5. The integrated valve group according to claim 4, characterized in that: The integrated valve group further includes a first one-way valve (61) provided on the first oil outlet passage (11); and / or The integrated valve group further includes a second one-way valve (62) provided on the first oil inlet passage (12) and a third one-way valve (63) provided on the second oil inlet passage (23).

6. The integrated valve group according to claim 4, characterized in that: A safety oil circuit (24) communicating with the second oil inlet (P2) and the oil return port (T) is also provided in the second valve block (2), and the integrated valve group further includes a relief valve (7) provided on the safety oil circuit (24).

7. The integrated valve group according to claim 1, characterized in that: The first speed limiting valve (31) and the second speed limiting valve (32) both comprise a valve sleeve (301), wherein a cavity (3011) is axially opened in the valve sleeve (301), and the cavity (3011) has an inlet (3012) and an outlet (3013); The first speed limiting valve (31) and the second speed limiting valve (32) further include a valve core (302) slidably disposed in the cavity (3011), and the valve core (302) is capable of adjusting the opening of the outlet (3013).

8. The integrated valve group according to claim 7, characterized in that: The outlet (3013) includes a first outlet (30131) and a second outlet (30132), wherein the first outlet (30131) is axially opened at one end of the valve sleeve (301) along the valve sleeve (301), and the second outlet (30132) is radially opened at a side wall of the valve sleeve (301) along the valve sleeve (301); The valve core (302) is capable of adjusting the opening of the second outlet (30132) when sliding.

9. The integrated valve group according to claim 7, characterized in that: A channel (3021) is axially opened in the valve core (302), and the first speed limiting valve (31) and the second speed limiting valve (32) further include a throttling screw plug (303) arranged in the channel (3021), and a throttling hole (3031) is axially opened in the throttling screw plug (303).

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