Bucket rod flow regeneration structure of hydraulic excavator

Abstract

The utility model discloses a hydraulic excavator bucket rod flow regeneration structure, and relates to the technical field of hydraulic excavator control valves, the hydraulic excavator bucket rod flow regeneration structure comprises a main control valve body, the main control valve body is provided with a valve core hole, and the main control valve body is provided with an oil inlet channel, an oil distribution channel, a bridge type oil channel, an oil return channel, a first oil channel, a second oil channel and a regeneration cavity which are communicated with the valve core hole; a regenerated oil duct is arranged in the main control valve body; the valve element controls communication of the bridge type oil channel and the first oil channel, communication of the oil inlet channel and the oil distribution channel and communication of the second oil channel and the regeneration cavity. The oil separation oil duct is communicated with the bridge-shaped oil duct; the bridge-shaped oil duct is communicated with the regeneration cavity through a regeneration oil duct; the regeneration oil duct is provided with a regeneration one-way valve; the bucket rod valve element assembly further comprises a regeneration channel cut-off assembly. The regeneration channel cut-off assembly is arranged in the valve element and used for controlling the communication area of the regeneration cavity and the oil return channel. According to the utility model, hydraulic oil regeneration and regeneration channel cut-off can be realized.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic excavator control valves, in particular to a hydraulic excavator bucket arm flow regeneration structure. Background Art

[0002] Hydraulic excavators are widely used in infrastructure construction, including hydraulic engineering, transportation, power engineering, and mining operations. While hydraulic excavator technology is quite mature, customer demand for low fuel consumption and high operating efficiency necessitates optimization and improvement of the excavator's hydraulic system. The flow regeneration function of the boom movement can significantly increase boom movement speed, improve operating efficiency, and reduce energy consumption. Conventional flow regeneration structures, due to their small regeneration capacity and complex structure, have been unable to meet these requirements. Therefore, a new boom flow regeneration structure has been developed and designed, featuring large regeneration capacity, high controllability, and a simple regeneration cut-off function. Utility Model Content

[0003] In view of the above-mentioned defects in the prior art, the purpose of the present utility model is to provide a flow regeneration structure for a hydraulic excavator bucket arm.

[0004] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0005] A hydraulic excavator boom flow regeneration structure includes a main control valve body, the main control valve body is provided with a through valve core hole, the main control valve body is provided with an oil inlet oil channel, an oil distribution oil channel, a bridge oil channel, an oil return oil channel, a first oil channel, and a second oil channel connected to the valve core hole; the valve core is separated from each oil channel by a sealing ring; the main control valve body is provided with a regeneration chamber connected to the valve core hole; the main control valve body is provided with a regeneration oil channel; the valve core controls the connection between the bridge oil channel and the first oil channel, The valve core controls the connection between the oil inlet channel and the oil distribution channel, and the valve core controls the connection between the second oil channel and the regeneration chamber; the oil distribution channel is connected to the bridge-type oil channel; the bridge-type oil channel is connected to the regeneration chamber through the regeneration oil channel; the regeneration oil channel is provided with a regeneration one-way valve for opening the regeneration oil channel under a specified pressure; the boom valve core assembly also includes a regeneration channel cut-off assembly; the regeneration channel cut-off assembly is arranged in the valve core, and the regeneration channel cut-off assembly is used to control the connection area between the regeneration chamber and the return oil channel.

[0006] Furthermore, the regeneration chamber and the oil return passage are adjacent oil passages, the valve core is provided with a first countersunk hole at the end close to the oil return passage, a number five hole in the form of a countersunk hole is provided at the bottom of the first countersunk hole, a number one hole is provided through the side wall of the bottom of the number five hole, and the number one hole connects the number five hole with the first oil passage to transmit pressure;

[0007] Specifically, the regeneration channel cut-off assembly is arranged in the first counterbore, and the regeneration channel cut-off assembly includes a plunger, a small valve core, a second spring, and a first plug which are arranged in sequence;

[0008] Specifically, the plunger is disposed inside the first counterbore to separate the fifth hole from the first counterbore;

[0009] Specifically, the first plug is sealed and connected to the first countersunk hole;

[0010] Specifically, the second spring pushes the small valve core against the end surface of the plunger;

[0011] Specifically, the outer wall of the end of the small valve core close to the plunger is a conical surface;

[0012] Specifically, the first countersunk hole wall of the valve core is sequentially provided with hole No. 2 and hole No. 4, the hole No. 2 is used to connect to the regeneration chamber, and the hole No. 4 is used to connect to the return oil channel. When the small valve core is in the initial position, the maximum diameter of the conical surface of the small valve core is between hole No. 2 and hole No. 4.

[0013] Furthermore, the end face of the plunger close to the small valve core is provided with a quantitative oil discharge channel connected to the side wall, and the end face of the small valve core close to the plunger is provided with a second countersunk hole, the opening of the quantitative oil discharge channel on the end face of the plunger corresponds to the second countersunk hole, and the wall of the second countersunk hole is provided with a No. 3 hole. When the small valve core is in the initial position, the No. 3 hole corresponds to the No. 4 hole.

[0014] Furthermore, the wall of the second counterbore is provided with a balancing hole connected to the space where the second spring is located, for balancing pressure.

[0015] Furthermore, the regeneration one-way valve includes a second plug, a fourth spring, and a sealing rod which are arranged in sequence;

[0016] Specifically, the main control valve body is provided with a regeneration valve hole, the second plug is sealed and connected to the regeneration valve hole, a valve seat ring is provided in the regeneration oil passage, and the fourth spring pushes the sealing rod onto the valve seat ring.

[0017] Furthermore, the communication channel between the oil separation channel and the bridge type oil channel is provided with a pressure compensation valve and a load check valve assembly, the pressure compensation valve is close to the oil separation channel, and the load check valve assembly is close to the bridge type oil channel.

[0018] Furthermore, the load check valve assembly comprises a screw plug, a check valve core, and a third spring;

[0019] Specifically, the main control valve body is provided with a one-way valve hole connected to the connecting channel, the screw plug is sealed and connected to the one-way valve hole, the bottom end of the screw plug is provided with a third countersunk hole, the one-way valve core is slidably sleeved in the third countersunk hole, the third spring is arranged in the third countersunk hole, and the connection between the bridge-type oil channel and the connecting channel forms a port valve seat, and the third spring pushes the one-way valve core against the port valve seat.

[0020] Furthermore, the main control valve body is provided with a control mechanism at both ends of the valve hole, and the control mechanism includes an end cover, a first spring, and a spring seat;

[0021] Specifically, the end cover is provided with a control oil port, and the end cover is sealed and connected to the valve body of the main control valve;

[0022] Specifically, the spring seat is provided with an axial variable diameter hole, the end of the variable diameter hole close to the main control valve body is a large diameter hole, the outer wall of the spring seat is provided with a convex ring on the end close to the main control valve body, the length of the spring seat is shorter than the length of the inner cavity of the end cover, and the large diameter hole of the spring seat is sleeved on the end head of the valve core;

[0023] Specifically, the first spring is sleeved on the outer wall of the spring seat, one end of the first spring is pressed against the inner wall of the end cover, and the other end is pressed against the convex ring of the spring seat.

[0024] Furthermore, the main control valve body is provided with an oil inlet, an oil return port, a first oil port, and a second oil port. The oil inlet is connected to the oil inlet oil channel, the oil return port is connected to the oil return oil channel, the first oil port is connected to the first oil channel, and the second oil port is connected to the second oil channel.

[0025] Furthermore, the main control valve body is provided with a first oil return channel, a first oil channel, a bridge-type oil channel, an oil distribution channel, an oil inlet channel, a pressure control oil channel, a second oil channel, a regeneration chamber, and a second oil return channel from left to right.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. The utility model can realize the regeneration of hydraulic oil in the small chamber of the bucket cylinder to the large chamber of the bucket cylinder. That is, when the bucket of the excavator is retracted, the high-pressure oil generated in the small chamber of the bucket cylinder due to the gravitational potential energy is introduced into the bridge-type oil circuit of the main valve through the internal oil circuit of the valve body, and then enters the large chamber of the bucket cylinder to realize the regeneration function of the hydraulic oil.

[0028] 2. The utility model is equipped with a plunger and a small valve core for realizing regeneration cut-off inside the boom valve core. At the same time, the regeneration circuit of the boom is placed in the valve body of the main control valve, which reduces the difficulty of processing the boom valve core, simplifies the regeneration circuit and regeneration cut-off structure of the boom, and can increase the regeneration oil circuit, which is no longer limited by the valve core size.

[0029] 3. When the bucket arm is in the excavation condition, the pressure in the large chamber of the bucket arm is higher than that in the small chamber of the bucket arm, which cuts off the regeneration in time, increases the oil return area, reduces pressure loss, reduces energy consumption, and improves the excavation efficiency; when the bucket arm is retracted, the hydraulic oil regeneration speeds up the retraction speed of the bucket arm, thereby improving the working efficiency under low load. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a structural diagram of a flow regeneration structure of a bucket arm of a hydraulic excavator according to the present invention;

[0031] Figure 2 This is a structural diagram of the dipper arm valve core assembly of the utility model;

[0032] Figure 3 This is a schematic diagram of the structure of the bucket rod flow regeneration cut-off state of the bucket rod valve core assembly in the utility model;

[0033] Figure 4 This is a structural diagram of a regeneration oil channel in a flow regeneration structure of a bucket arm of a hydraulic excavator according to the present invention;

[0034] Figure 5 It is a structural diagram of the load check valve assembly in the utility model.

[0035] In the figure: main control valve body 1, bucket valve core assembly 2, spring seat 3, end cover 4, first spring 5, load check valve assembly 6, pressure compensation valve 7, bucket valve core 8, plunger 9, small valve core 10, second spring 11, first plug 12, screw plug 13, third spring 14, check valve core 15, second plug 16, fourth spring 17, regeneration check valve 18;

[0036] Hole Ⅰ, hole Ⅱ, hole Ⅲ, hole Ⅳ, hole Ⅴ;

[0037] Oil inlet channel a, oil distribution channel b, bridge oil channel c, oil return channel d, regeneration chamber e, regeneration oil channel f, first oil channel g, second oil channel h, first oil return channel m, pressure control oil channel n, oil inlet port P, oil return port T, first oil port Y1, second oil port Y2. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0039] Example 1:

[0040] See also Figures 1 to 5 The utility model provides a hydraulic excavator boom flow regeneration structure, including a main control valve body 1, the main control valve body 1 is provided with a through valve core hole, the main control valve body 1 is provided with an oil inlet oil channel a, an oil distribution oil channel b, a bridge oil channel c, an oil return oil channel d, a regeneration chamber e, a first oil channel g, and a second oil channel h connected to the valve core hole, and a regeneration oil channel f is provided in the main control valve body 1; a boom valve core assembly 2 is provided in the valve core hole, the boom valve core assembly 2 includes a valve core 8, the valve core 8 is provided with multiple sealing rings, the multiple sealing rings of the valve core 8 separate the various oil channels, the valve core 8 controls The bridge-type oil passage c is connected with the first oil passage g, the valve core 8 controls the connection between the oil inlet passage a and the oil distribution passage b, the valve core 8 controls the connection between the second oil passage h and the regeneration chamber e, the oil distribution passage b is connected with the bridge-type oil passage c, the bridge-type oil passage c is connected with the regeneration chamber e through the regeneration oil passage f, and the regeneration oil passage f is provided with a regeneration one-way valve 18 for opening the regeneration oil passage f under a specified pressure; the boom valve core assembly 2 includes a regeneration channel cut-off assembly, the regeneration channel cut-off assembly is arranged in the valve core 8, and the regeneration channel cut-off assembly is used to control the connection area between the regeneration chamber e and the return oil passage d.

[0041] Specifically, the main control valve body 1 is provided with an oil inlet P, an oil return port T, a first oil port Y1, and a second oil port Y2. The oil inlet P is connected to the oil inlet channel a, the oil return port T is connected to the oil return channel d, the first oil port Y1 is connected to the first oil channel g, and the second oil port Y2 is connected to the second oil channel h.

[0042] Furthermore, the regeneration chamber e and the oil return passage d are adjacent oil passages, and the valve core 8 is provided with a first countersunk hole at the end near the oil return passage d, and a No. 5 hole V in the form of a countersunk hole is provided at the bottom of the first countersunk hole, and a No. 1 hole I is provided on the side wall of the bottom of the No. 5 hole V, and the No. 1 hole I connects the No. 5 hole V with the first oil passage g to transmit pressure; the regeneration channel cut-off assembly is provided in the first countersunk hole, and the regeneration channel cut-off assembly includes a plunger 9, a small valve core 10, a second spring 11, and a first plug 12 arranged in sequence; the plunger 9 is provided at the Inside a countersunk hole, the No. 5 hole V is separated from the first countersunk hole. The first plug 12 is threadedly connected to the first countersunk hole and sealed by a sealing ring. The second spring 11 pushes the small valve core 10 against the end face of the plunger 9. The outer wall of the end of the small valve core 10 close to the plunger 9 is a conical surface. The wall of the first countersunk hole of the valve core 8 is sequentially provided with No. 2 hole II and No. 4 hole IV. The No. 2 hole II is used to connect to the regeneration chamber e, and the No. 4 hole IV is used to connect to the return oil channel d. When the small valve core 10 is in the initial position, the maximum diameter of the conical surface of the small valve core 10 is between No. 2 hole II and No. 4 hole IV.

[0043] Specifically, the end face of the plunger 9 close to the small valve core 10 is provided with a quantitative oil discharge channel connected to the side wall, and the end face of the small valve core 10 close to the plunger 9 is provided with a second countersunk hole. The opening of the quantitative oil discharge channel at the end face of the plunger 9 corresponds to the second countersunk hole, and the wall of the second countersunk hole is provided with a No. 3 hole III. When the small valve core 10 is in the initial position, the No. 3 hole III corresponds to the No. 4 hole IV.

[0044] Specifically, the wall of the second counterbore is provided with a balancing hole connected to the space where the second spring 11 is located, for balancing the pressure so that the small valve core 10 can smoothly squeeze the second spring 11 .

[0045] Preferably, the quantitative oil discharge channel is a radially penetrating quantitative oil discharge groove.

[0046] Among them, the plunger 9 is used to control the regeneration cut-off, the small valve core 10 controls the regeneration flow rate, the plunger 9 and the small valve core 10 are in direct contact, and the second spring 11 provides reset elastic force for the plunger 9 and the small valve core 10.

[0047] Furthermore, the regeneration one-way valve 18 includes a second plug 16, a fourth spring 17, and a sealing rod arranged in sequence. The main control valve body 1 is provided with a regeneration valve hole. The second plug 16 is threadedly connected to the regeneration valve hole and sealed by a sealing ring. A valve seat ring is provided in the regeneration oil channel f. The fourth spring 17 pushes the sealing rod against the valve seat ring to achieve sealing.

[0048] Furthermore, the connecting passage between the oil-dividing oil passage b and the bridge-type oil passage c is provided with a pressure-compensating valve 7 and a load-check valve assembly 6. The pressure-compensating valve 7 is close to the oil-dividing oil passage b, and the load-check valve assembly 6 is close to the bridge-type oil passage c. The pressure-compensating valve 7 maintains a constant pressure, the load-check valve assembly 6 realizes one-way flow control, and sets an opening pressure. The pressure-compensating valve 7 and the load-check valve assembly 6 jointly ensure stability and efficiency.

[0049] Specifically, the load one-way valve assembly 6 includes a plug screw 13, a one-way valve core 15, and a third spring 14. The main control valve body 1 is provided with a one-way valve hole connected to the connecting channel. The plug screw 13 is threadedly connected to the one-way valve hole and sealed by a sealing ring. The bottom end of the plug screw 13 is provided with a third countersunk hole. The one-way valve core 15 is slidably sleeved with the third countersunk hole. The third spring 14 is arranged in the third countersunk hole. The connection between the bridge-type oil channel c and the connecting channel forms a port valve seat. The third spring 14 pushes the one-way valve core 15 against the port valve seat to close the connecting channel; the main control valve body 1 is provided with a compensation valve hole connected to the connecting channel, and the compensation valve hole is threadedly connected to the pressure compensation valve 7 and sealed by a sealing ring. The pressure compensation valve 7 itself is a prior art and can be obtained by purchase, so it will not be discussed in detail.

[0050] Furthermore, the main control valve body 1 is provided with a control mechanism at both ends of the valve hole, and the control mechanism includes an end cover 4, a first spring 5, and a spring seat 3. The end cover 4 is provided with a control oil port, and the end cover 4 is connected to the main control valve body 1 by bolts. The end cover 4 and the main control valve body 1 are sealed by a gasket. The spring seat 3 is provided with an axial reducing hole, and the reducing hole is a large-diameter hole at one end close to the main control valve body 1. A convex ring is provided on the outer wall of the spring seat 3 close to the end of the main control valve body 1. The length of the spring seat 3 is shorter than the length of the inner cavity of the end cover 4. The large-diameter hole of the spring seat 3 is sleeved on the end head of the valve core 8, and the first spring 5 is sleeved on the outer wall of the spring seat 3. One end of the first spring 5 is against the inner wall of the end cover 4, and the other end is against the convex ring of the spring seat 3.

[0051] Among them, the spring seat 3 realizes the mechanical limit of the valve core 2, and after the spring seat 3 contacts the end cover 4, it limits the stroke of the valve core 8; the first spring 5 is provided with an initial compression force, which is used to fix the initial position of the valve core 8 and provide a reset force for the valve core 8 after the action is completed.

[0052] Example 2:

[0053] Based on Example 1, the main control valve body 1 in this embodiment is provided with a first oil return channel m, a first oil channel g, a bridge-type oil channel c, an oil distribution channel b, an oil inlet channel a, a pressure control oil channel n, a second oil channel h, a regeneration chamber e, and a second oil return channel from left to right.

[0054] The first oil return channel m is connected to the oil return port T.

[0055] The second oil return passage is the oil return passage d in Example 1.

[0056] The structure of the pressure control oil passage n is the same as that of the bridge-type oil passage c except that the regeneration oil passage f is removed.

[0057] Specifically, the connection relationship between the first return oil channel m, the first oil channel g, the bridge-type oil channel c, the oil distribution channel b, the oil inlet channel a, the pressure control oil channel n, the second oil channel h, the second return oil channel and the valve core 8 is the existing technology, such as the announcement No. CN219062113U, the disclosed reversing valve, hydraulic system and operating machinery. The contribution of the present utility model lies in the setting of the regeneration chamber e, the regeneration oil channel f, the regeneration one-way valve 18, and the regeneration channel cut-off assembly.

[0058] Example 3:

[0059] Based on Example 2, this embodiment provides a method for using a flow regeneration structure of a bucket arm of a hydraulic excavator, comprising the following steps:

[0060] S1. Connect the first oil port Y1 of the main control valve body 1 to the large cavity of the excavator arm cylinder, connect the second oil port Y2 to the small cavity of the excavator arm cylinder, and connect the hydraulic pipelines of the oil inlet P, oil return port T, and control oil port.

[0061] S2. The pilot oil is controlled by the excavator handle to push the boom valve core assembly 2 to the left. At this time, the oil inlet path is the oil inlet port P, the oil inlet channel a, the oil distribution channel b, the pressure compensation valve 7, the load check valve 6, the pressure control oil channel n, the second oil channel h, the second oil port Y2, and the small chamber of the boom cylinder; the oil return path is the large chamber of the boom cylinder, the first oil port Y1, the first oil channel g, the first return oil channel m, and the return oil port T. At this time, the excavator boom is extended.

[0062] S3, when the excavator boom is retracted, the pilot oil boom valve core assembly 2 is controlled to move rightward by the excavator handle. At this time, the oil inlet path is the oil inlet port P, the oil inlet channel a, the oil distribution channel b, the pressure compensation valve 7, the load check valve 6, the bridge oil channel c, the first oil channel g, the first oil port Y1, and the large chamber of the boom cylinder; the oil return path is the small chamber of the boom cylinder, the second oil port Y2, the second oil channel h, and the regeneration chamber e.

[0063] like Figure 5 As shown, a portion of the hydraulic oil in the regeneration chamber e passes through the regeneration oil passage f to the regeneration check valve 18, overcomes the elastic force of the fourth spring 17 of the regeneration check valve 18, and enters the bridge oil passage c. Together with the hydraulic oil from the oil inlet passage a, it enters the large chamber of the boom cylinder, realizing the boom flow regeneration function.

[0064] The other part of the hydraulic oil in the regeneration chamber e passes through the No. 2 hole II, the quantitative oil discharge channel, the second countersunk hole, the No. 3 hole III, and the No. 4 hole IV into the oil return channel d.

[0065] S4, such as Figure 3 As shown, when the pressure in the large chamber of the boom cylinder is higher than that in the small chamber, the pressure oil in the large chamber of the boom cylinder acts on the left side of the plunger 9 through the No. 1 hole I and the No. 5 hole V on the valve core 8, pushing the plunger 9 to the right, and simultaneously pushing the small valve core 10 to the right. As the small valve core 10 moves, the large diameter of the conical surface of the small valve core 10 passes through the No. 4 hole IV, forming an annular oil return groove. The hydraulic oil in the small chamber of the boom cylinder passes through the No. 2 hole II, and then enters the oil return channel d through the annular oil return groove and the No. 4 hole IV.

[0066] As the small valve core 10 moves to the right, the area of ​​the annular oil return groove increases, the oil return area increases, the pressure in the regeneration oil channel f continues to decrease, and the regeneration one-way valve 18 closes the regeneration oil channel f, realizing the bucket rod flow regeneration cut-off function, improving excavation efficiency, reducing excavation back pressure, and reducing energy consumption.

[0067] All components not discussed in detail in this application and the connection methods of the components in this application are well-known technologies in the technical field and can be directly applied without further explanation.

[0068] In this utility model, the term "plurality" refers to two or more, unless otherwise specified. Terms such as "installed," "connected," "connected," and "fixed" should be interpreted broadly. For example, "connected" can mean fixed, removable, or integral; "connected" can mean directly or indirectly through an intermediary. Those skilled in the art will understand the specific meanings of these terms in this utility model based on specific circumstances.

[0069] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by terms such as "up", "down", "left", "right", "front" and "back" are based on the directions or positional relationships shown in the accompanying 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 unit referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the present invention.

[0070] Throughout this specification, terms such as "one embodiment," "some embodiments," and "specific embodiments" mean that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0071] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A hydraulic excavator boom flow regeneration structure, comprising a main control valve body, the main control valve body having a through valve core hole, the main control valve body having an oil inlet passage, an oil distribution passage, a bridge oil passage, an oil return passage, a first oil passage, and a second oil passage, all connected to the valve core hole; the valve core is provided with sealing rings to separate the oil passages; It is characterized by: The main control valve body is provided with a regeneration chamber communicating with the valve core hole; the main control valve body is provided with a regeneration oil channel; The valve core controls the communication between the bridge oil passage and the first oil passage, the valve core controls the communication between the oil inlet oil passage and the oil distribution oil passage, and the valve core controls the communication between the second oil passage and the regeneration chamber; The oil distribution channel is connected to the bridge type oil channel; The bridge-type oil passage is connected to the regeneration chamber via a regeneration oil passage; The regeneration oil passage is provided with a regeneration one-way valve for opening the regeneration oil passage at a specified pressure; A boom valve core assembly is arranged in the valve core hole, and the boom valve core assembly includes a valve core and a regeneration channel cut-off assembly; The regeneration channel cutting component is arranged in the valve core, and the regeneration channel cutting component is used to control the communication area between the regeneration chamber and the oil return channel.

2. The hydraulic excavator bucket arm flow regeneration structure according to claim 1, characterized in that: The regeneration chamber and the oil return passage are adjacent oil passages. The valve core is provided with a first countersunk hole at the end close to the oil return passage. A number five hole in the form of a countersunk hole is provided at the bottom of the first countersunk hole. A number one hole is provided through the side wall of the bottom of the number five hole. The number one hole connects the number five hole with the first oil passage to transmit pressure. The regeneration channel cut-off assembly is arranged in the first countersunk hole, and the regeneration channel cut-off assembly includes a plunger, a small valve core, a second spring, and a first plug which are arranged in sequence; The plunger is disposed inside the first counterbore to separate the fifth hole from the first counterbore; The first plug is sealed and connected to the first countersunk hole; The second spring pushes the small valve core against the end face of the plunger; The outer wall of the end of the small valve core close to the plunger is a conical surface; The first countersunk hole wall of the valve core is provided with hole No. 2 and hole No. 4 in sequence, hole No. 2 is used to connect to the regeneration chamber, and hole No. 4 is used to connect to the oil return channel. When the small valve core is in the initial position, the maximum diameter of the conical surface of the small valve core is between hole No. 2 and hole No.

4.

3. The hydraulic excavator bucket arm flow regeneration structure according to claim 2, characterized in that: The end face of the plunger close to the small valve core is provided with a quantitative oil discharge channel connected to the side wall, and the end face of the small valve core close to the plunger is provided with a second countersunk hole. The opening of the quantitative oil discharge channel on the end face of the plunger corresponds to the second countersunk hole. The wall of the second countersunk hole is provided with a No. 3 hole. When the small valve core is in the initial position, the No. 3 hole corresponds to the No. 4 hole.

4. The hydraulic excavator bucket arm flow regeneration structure according to claim 3, characterized in that: The wall of the second counterbore is provided with a balancing hole connected to the space where the second spring is located, for balancing pressure.

5. The hydraulic excavator bucket arm flow regeneration structure according to claim 1, characterized in that: The regeneration one-way valve includes a second plug, a fourth spring, and a sealing rod arranged in sequence; The main control valve body is provided with a regeneration valve hole, the second plug is sealed and connected to the regeneration valve hole, a valve seat ring is provided in the regeneration oil passage, and the fourth spring pushes the sealing rod onto the valve seat ring.

6. The hydraulic excavator bucket arm flow regeneration structure according to claim 1, characterized in that: The communication channel between the oil separation channel and the bridge oil channel is provided with a pressure compensation valve and a load check valve assembly. The pressure compensation valve is close to the oil separation channel, and the load check valve assembly is close to the bridge oil channel.

7. The hydraulic excavator bucket arm flow regeneration structure according to claim 6, characterized in that: The load check valve assembly includes a screw plug, a check valve core, and a third spring; The main control valve body is provided with a one-way valve hole connected to the communicating channel, the screw plug is sealedly connected to the one-way valve hole, the bottom end of the screw plug is provided with a third countersunk hole, the one-way valve core is slidably sleeved in the third countersunk hole, the third spring is arranged in the third countersunk hole, and the connection between the bridge-type oil channel and the communicating channel forms a port valve seat, and the third spring pushes the one-way valve core against the port valve seat.

8. The hydraulic excavator bucket arm flow regeneration structure according to claim 1, characterized in that: The main control valve body is provided with a control mechanism at both ends of the valve hole, and the control mechanism includes an end cover, a first spring, and a spring seat; The end cover is provided with a control oil port, and the end cover is sealed and connected to the valve body of the main control valve; The spring seat is provided with an axial variable diameter hole, the end of the variable diameter hole close to the valve body of the main control valve is a large diameter hole, the outer wall of the spring seat is provided with a convex ring on the end close to the valve body of the main control valve, the length of the spring seat is shorter than the length of the inner cavity of the end cover, and the large diameter hole of the spring seat is sleeved on the end head of the valve core; The first spring is sleeved on the outer wall of the spring seat, one end of the first spring is pressed against the inner wall of the end cover, and the other end is pressed against the convex ring of the spring seat.

9. A hydraulic excavator bucket arm flow regeneration structure according to any one of claims 1 to 8, characterized in that: The main control valve body is provided with an oil inlet, an oil return port, a first oil port, and a second oil port. The oil inlet is connected to the oil inlet oil channel, the oil return port is connected to the oil return oil channel, the first oil port is connected to the first oil channel, and the second oil port is connected to the second oil channel.

10. The hydraulic excavator bucket arm flow regeneration structure according to claim 9, characterized in that: The main control valve body is provided with a first oil return passage, a first oil passage, a bridge oil passage, an oil distribution passage, an oil inlet passage, a pressure control oil passage, a second oil passage, a regeneration chamber, and a second oil return passage from left to right.

Images