Electro-hydraulic control device

Abstract

An electro-hydraulic control device comprises a hydraulic cylinder, an oil storage cylinder and a flow channel structure. The flow channel structure comprises an extending flow channel, a retracting flow channel and a pump cavity communicated with the extending flow channel and the retracting flow channel, an oil pumping assembly is assembled in the pump cavity, and the oil pumping assembly is driven by a motor fixed to the oil storage cylinder; a piston is assembled in the hydraulic cylinder, the piston is connected with a hydraulic rod, a cavity in the hydraulic cylinder is divided into a rodless cavity and a rod cavity by the piston, the extending flow channel is communicated with the rodless cavity, and the retracting flow channel is communicated with the rod cavity. The oil storage cylinder is arranged on the side face of the hydraulic cylinder to form a T-shaped layout. A mounting part and an oil storage cavity are arranged on the side surface of a cylinder body of the hydraulic cylinder, a valve plate is assembled on the mounting part, the mounting part and the valve plate are assembled to form a valve seat, and the runner structure is arranged in the valve seat; a containing cavity for containing the valve seat is formed in the oil storage cylinder and communicates with the oil storage cavity. The T-shaped layout design is adopted, the structural strength and stability are greatly improved, the runner structure is optimized, and the response speed is increased.

Description

Technical Field

[0001] The present invention belongs to the technical field of electro-hydraulic actuators, and in particular relates to an electro-hydraulic control device. Background Art

[0002] An electro-hydraulic control device converts electrical energy into hydraulic energy and uses this energy to precisely control mechanical devices. It is widely used in a variety of fields, including industrial automation, mechanical engineering, automotive manufacturing, and aerospace. The core components of this device include a hydraulic cylinder and an oil storage drive assembly. A hydraulic cylinder is typically a cylindrical chamber with a piston mounted inside. The piston is connected to an external mechanical device via a hydraulic rod. When hydraulic oil enters the cylinder, it pushes the piston to move, thereby driving the external mechanical device to perform corresponding movements and achieve control of the mechanical device. The oil storage drive assembly is primarily responsible for storing the hydraulic oil and delivering it to the hydraulic cylinder via an oil pump assembly.

[0003] Most existing electro-hydraulic control devices use a parallel layout design of hydraulic cylinders and oil storage drive components, such as the utility model patent application number 2022222253638, entitled "An Electric Hydraulic Lifter". This layout has the following problems:

[0004] 1. Weak structural strength: The connection between the hydraulic cylinder and the oil storage drive component is not structurally strong enough, which can easily lead to leakage and breakage due to vibration, external forces, and other factors. This not only affects the stability and reliability of the device, but may also cause safety accidents and increase maintenance costs.

[0005] 2. Complex flow path structure: The oil flow path is long, resulting in slow response speed. The oil needs to pass through multiple complex pipes and valves to reach the hydraulic cylinder. This not only increases the flow resistance of the oil, but also reduces the control accuracy and working efficiency of the device, making it difficult to meet the requirements of fast switching and precise control.

[0006] 3. High production cost: The overall structure is complex, which not only increases the difficulty of processing and assembly during the production process, resulting in reduced production efficiency, but also makes the production cost high, affecting the market competitiveness of the product.

[0007] In summary, the existing electro-hydraulic control devices have many problems in structural design and performance, and there is an urgent need for a more reasonable and efficient electro-hydraulic control device to meet market demand. Summary of the Invention

[0008] In order to solve the above technical problems, the present invention is solved through the following technical solutions.

[0009] An electro-hydraulic control device includes a hydraulic cylinder, an oil storage cylinder, and a flow channel structure; the flow channel structure includes an extension flow channel, a retraction flow channel, and a pump chamber connecting the extension flow channel and the retraction flow channel, the pump chamber is equipped with an oil pump assembly, and the oil pump assembly is driven by a motor fixed to the oil storage cylinder; the hydraulic cylinder is equipped with a piston, the piston is connected to a hydraulic rod, the piston divides the cavity in the hydraulic cylinder into a rodless cavity and a rod cavity, the extension flow channel is connected to the rodless cavity, and the retraction flow channel is connected to the rod cavity. The oil storage cylinder is arranged on the side of the hydraulic cylinder to form a T-shaped layout. A mounting portion and an oil storage chamber are provided on the side of the cylinder body of the hydraulic cylinder, a valve plate is mounted on the mounting portion, the mounting portion and the valve plate are assembled to form a valve seat, and the flow channel structure is provided in the valve seat; a accommodating cavity for accommodating the valve seat is provided in the oil storage cylinder, and the oil storage cavity is connected to the accommodating cavity.

[0010] Furthermore, the flow channel structure also includes an oil supply flow channel, which communicates with the pump chamber and the accommodating chamber.

[0011] Furthermore, the oil pump assembly includes a pair of mutually meshing oil pump gears, and a driving gear driven by a motor, which is meshed with one of the oil pump gears; the pump chamber includes a main chamber for accommodating the oil pump gear and a side chamber for accommodating the driving gear; there are two oil replenishment channels, one connecting to the pump chamber and the other connecting to the side chamber.

[0012] Furthermore, the motor is provided with a drive shaft, the drive gear is provided on the drive shaft, the valve seat is provided with a drive groove for the drive shaft to extend into, the drive groove is equipped with a bearing, and the bearing is sleeved on the drive shaft.

[0013] Furthermore, an extending assembly chamber is provided at one end of the extending flow channel connected to the rodless chamber, and a retracting assembly chamber is provided at one end of the retracting flow channel connected to the rod chamber. Both the extending assembly chamber and the retracting assembly chamber are equipped with pressure-maintaining components; when the hydraulic pressure in the flow channel structure is greater than the hydraulic pressure in the hydraulic cylinder, the pressure-maintaining component opens; when the hydraulic pressure in the hydraulic cylinder is greater than the hydraulic pressure in the flow channel structure, the pressure-maintaining component closes.

[0014] Furthermore, a pressure relief channel is provided on the valve plate, which is communicated with the extension assembly cavity and the retraction assembly cavity. A channel pressure relief valve is installed in the pressure relief channel, and the channel structure can be depressurized by manually opening the channel pressure relief valve.

[0015] Furthermore, the flow channel structure also includes an extending oil outlet channel and a retracting oil outlet channel, the extending oil outlet channel connects the extending flow channel and the accommodating chamber, and the retracting oil outlet channel connects the retracting flow channel and the accommodating chamber; the extending oil outlet channel and the retracting oil outlet channel are both equipped with an oil outlet one-way valve that allows oil to flow from the flow channel structure to the accommodating chamber.

[0016] Furthermore, a manual relief valve and a relief check valve are mounted on the valve seat. The manual relief valve includes a control rod, a pressure relief rod, and a manual relief spring. The pressure relief rod is mounted at the bottom of the control rod, and the manual relief spring is used to help reset the control rod. The control rod is equipped with a limit pin, and the housing of the oil storage cylinder is provided with a switching slide that cooperates with the limit pin. The groove depth at one end of the switching slide is greater than the groove depth at the other end, and the groove depths at both ends correspond to the closed state and open state of the manual relief valve, respectively. A manual relief groove is provided on the valve plate, connecting to the accommodating chamber, and the pressure relief rod is located in the manual relief groove. A relief control groove is provided on the mounting portion corresponding to the manual relief groove, and the pressure relief check valve is located in the relief control groove. When the manual relief valve is opened, the pressure relief rod descends and opens the relief check valve, and the oil in the hydraulic cylinder cavity enters the accommodating chamber through the manual relief groove.

[0017] Furthermore, a rodless relief valve and a rod relief valve are mounted on the valve seat. The rodless relief valve is used to automatically relieve pressure on the rodless cavity, and the rod relief valve is used to automatically relieve pressure on the rod cavity.

[0018] Furthermore, a through pipe is installed in the cavity of the hydraulic cylinder, and the piston is installed in the through pipe. There is a space between the through pipe and the inner wall of the cavity. A spacer ring is installed on the outer wall of the through pipe. The spacer ring divides the space into a rodless connection space connected to the rodless cavity and a rod connection space connected to the rod cavity. The extending flow channel connects to the rodless connection space, and the retracting flow channel connects to the rod connection space.

[0019] Compared with the existing technology, this application has the following beneficial technical effects:

[0020] 1. The hydraulic cylinder and the oil storage cylinder adopt a T-shaped layout design. Compared with the parallel design of the hydraulic cylinder and the oil storage cylinder, the structural strength and stability are greatly improved, avoiding problems such as leakage points in the flow channel structure and easy breakage of parallel connections due to factors such as vibration and external force.

[0021] 2. The T-shaped layout design greatly shortens the flow channel length, greatly optimizes the flow channel structure, and improves the response speed.

[0022] 3. The oil pump assembly, flow channel structure and other components and structures are integrated into the valve seat, which greatly optimizes the overall structure of the control device and reduces costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a three-dimensional diagram of the electro-hydraulic control device.

[0024] Figure 2 This is an exploded view of the electro-hydraulic control device.

[0025] Figure 3 It is a top view of the electro-hydraulic control device.

[0026] Figure 4 for Figure 3Cross-sectional view at AA in the middle.

[0027] Figure 5 for Figure 4 A partial enlarged view of point B in the middle.

[0028] Figure 6 This is the assembly drawing of the motor, valve seat and hydraulic cylinder.

[0029] Figure 7 A three-dimensional cutaway view of the valve seat and hydraulic cylinder Figure 1 .

[0030] Figure 8 A three-dimensional cutaway view of the valve seat and hydraulic cylinder Figure 2 .

[0031] Figure 9 A three-dimensional cutaway view of the valve seat and hydraulic cylinder Figure 3 .

[0032] Figure 10 It is a three-dimensional view of the oil storage cylinder housing.

[0033] Figure 11 This is the layout diagram of the flow channel structure.

[0034] Figure 12 A top view of the valve seat.

[0035] Figure 13 This is the assembly drawing of the valve plate and related valve body.

[0036] Figure 14 A three-dimensional diagram of the valve plate.

[0037] Figure 15 This is the structural diagram of the installation part.

[0038] Figure 16 This is a cross-sectional view of the valve seat at the pressure-maintaining component.

[0039] Figure 17 This is an exploded view of the pressure-holding component.

[0040] Figure 18 This is an exploded view of the oil outlet one-way valve.

[0041] The following is a description of the accompanying drawings:

[0042] 100, hydraulic cylinder; 101, rodless chamber; 102, rod chamber; 103, rodless connecting space; 104, rod connecting space; 105, oil storage chamber; 106, leakage control groove; 110, piston; 120, hydraulic rod; 130, through pipe; 140, spacer ring;

[0043] 200, oil storage cylinder; 201, accommodating chamber; 202, switching chute; 210, motor; 211, drive shaft; 220, oil pump assembly; 221, oil pump gear; 222, drive gear;

[0044] 300, flow channel structure; 310, extension flow channel; 311, extension assembly chamber; 320, retraction flow channel; 321, retraction assembly chamber; 330, pump chamber; 331, main chamber; 332, side chamber; 340, oil supply flow channel; 350, extension oil outlet channel; 351, retraction oil outlet channel; 360, pressure relief flow channel; 370, rodless discharge channel; 371, rod discharge channel; 380, manual discharge channel;

[0045] 400, valve seat; 410, mounting portion; 420, valve plate; 430, bearing; 440, oil outlet check valve; 441, oil outlet check valve disc; 442, oil outlet check valve block; 443, through groove; 444, oil outlet check spring; 450, flow channel pressure relief valve; 460, rodless flow relief valve; 461, rod flow relief valve; 462, stop rod; 463, automatic flow relief spring; 470, manual flow relief valve; 471, control lever; 472, pressure relief lever; 473, manual flow relief spring; 474, limit pin; 480, flow relief check valve;

[0046] 500, pressure-maintaining assembly; 510, pressure-maintaining valve; 511, cavity; 512, first oil port; 513, second oil port; 520, pressure-maintaining valve core; 521, pressure-maintaining protrusion; 530, pressure-maintaining spring; 540, auxiliary valve; 541, third oil port; 542, auxiliary protrusion; 550, auxiliary spring; 560, baffle. DETAILED DESCRIPTION

[0047] The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0048] In the following embodiments, the same or similar numbers throughout represent the same or similar components or components with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be understood as limiting the present invention.

[0049] In the description of the present invention, it should be understood that the terms: center, longitudinal, transverse, length, width, thickness, up, down, front, back, left, right, vertical, horizontal, top, bottom, inside, outside, clockwise, counterclockwise, etc. indicating directions or positional relationships 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, and therefore cannot be understood as limiting the present invention. In addition, the terms: first, second, etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features shown. In the description of the present invention, unless otherwise clearly specified and limited, the terms: install, connect, connect, etc. should be understood in a broad sense, and ordinary technicians in this field can understand the specific meaning of the above terms in this practical application according to the specific circumstances.

[0050] refer to Figures 1 to 18 An electro-hydraulic control device includes a hydraulic cylinder 100, an oil storage cylinder 200, and a flow channel structure 300. The flow channel structure 300 includes an extension flow channel 310, a retraction flow channel 320, and a pump chamber 330 connecting the extension flow channel 310 and the retraction flow channel 320. The pump chamber 330 is equipped with an oil pump assembly 220, and the oil pump assembly 220 is driven by a motor 210 fixed to the oil storage cylinder 200. The hydraulic cylinder 100 is equipped with a piston 110, and the piston 110 is connected to a hydraulic rod 120. The piston 110 divides the cavity in the hydraulic cylinder 100 into a rodless cavity 101 and a rod cavity 102. The extension flow channel 310 is connected to the rodless cavity 101, and the retraction flow channel 320 is connected to the rod cavity 102. The oil storage cylinder 200 is arranged on the side of the hydraulic cylinder 100 to form a T-shaped layout. The side of the cylinder body of the hydraulic cylinder 100 is provided with a mounting portion 410 and an oil storage chamber 105, and a valve plate 420 is assembled on the mounting portion 410. The mounting portion 410 and the valve plate 420 are assembled to form a valve seat 400, and the flow channel structure 300 is arranged in the valve seat 400; an accommodating chamber 201 for accommodating the valve seat 400 is provided in the oil storage cylinder 200, and the oil storage chamber 105 is connected to the accommodating chamber 201.

[0051] Compared to the prior art, the hydraulic cylinder 100 and the oil storage cylinder 200 in this application adopt a T-shaped layout design. Compared with the parallel design of the hydraulic cylinder 100 and the oil storage cylinder 200, the structural strength and stability are greatly improved, avoiding the problems of leakage points in the flow channel structure 300 and easy breakage of the parallel connection due to factors such as vibration and external force. The T-shaped layout design greatly shortens the flow channel length, greatly optimizes the flow channel structure 300, and improves the response speed. In addition, thanks to the T-shaped layout, this application integrates components and structures such as the oil pump assembly 220 and the flow channel structure 300 into the valve seat 400, greatly simplifying the overall structure of the control device and reducing costs.

[0052] Example 1

[0053] As an embodiment of this application, refer to Figure 11The end of the extending flow channel 310 connected to the rodless cavity 101 is provided with an extending assembly cavity 311, and the end of the retracting flow channel 320 connected to the rod cavity 102 is provided with a retracting assembly cavity 321. The extending assembly cavity 311 and the retracting assembly cavity 321 are both equipped with a pressure-maintaining assembly 500. When the hydraulic pressure in the flow channel structure 300 is greater than the hydraulic pressure in the hydraulic cylinder 100 (such as during the system oil replenishment or pressure fluctuation stage), the pressure-maintaining assembly 500 opens to ensure oil pressure balance; when the hydraulic pressure in the hydraulic cylinder 100 is greater than the hydraulic pressure in the flow channel structure 300 (such as during the static pressure-maintaining stage of the actuator), the pressure-maintaining assembly 500 closes to prevent the oil from flowing back from the hydraulic cylinder 100 to the oil storage cylinder 200, so that the hydraulic cylinder 100 is in a holding state.

[0054] Specifically, refer to Figure 16 and Figure 17 The pressure-maintaining assembly 500 includes a pressure-maintaining valve 510, which has a cavity 511 therein. A pressure-maintaining valve core 520 and a pressure-maintaining spring 530 are mounted within the cavity 511. A first oil port 512 and a second oil port 513 are provided at both axial ends of the cavity 511. The first oil port 512 is located near the valve plate 420, while the second oil port 513 is located near the hydraulic cylinder 100. A gap for oil flow is defined between the side of the pressure-maintaining valve core 520 and the inner wall of the cavity 511. The end surface of the pressure-maintaining valve core 520, under the action of the pressure-maintaining spring 530, blocks the first oil port 512.

[0055] Furthermore, the pressure-maintaining assembly 500 also includes an auxiliary valve 540, which can assist in opening the pressure-maintaining valve 510. The auxiliary valve 540 is provided with an axially extending third oil port 541. The auxiliary valve 540 is located on the side of the pressure-maintaining valve 510 having the first oil port 512, and is connected to the pressure-maintaining valve 510 via an auxiliary spring 550. The other side of the auxiliary valve 540 is equipped with a blocking plate 560 that blocks the third oil port 541. The side of the auxiliary valve 540 facing the pressure-maintaining valve 510 is provided with an auxiliary protrusion 542, and the pressure-maintaining valve core 520 is provided with a pressure-maintaining protrusion 521. When the pressure-maintaining valve 510 is in the closed state, the pressure-maintaining protrusion 521 extends from the first oil port 512. When the hydraulic pressure in the flow channel structure 300 is greater than the hydraulic pressure in the hydraulic cylinder 100 , the oil pressure drives the auxiliary valve 540 to move toward the pressure-maintaining valve 510 , and the auxiliary protrusion 542 pushes against the pressure-maintaining protrusion 521 and moves backward to open the pressure-maintaining valve 510 .

[0056] To match the design of the valve seat 400, the distance between the extended assembly cavity 311 and the retracted assembly cavity 321 is reduced. Figure 4 and Figure 5A through pipe 130 is installed in the cavity of the hydraulic cylinder 100, and the piston 110 is installed in the through pipe 130. There is a space between the through pipe 130 and the inner wall of the cavity. A spacer ring 140 is installed on the outer wall of the through pipe 130. The spacer ring 140 divides the space into a rodless connecting space 103 connected to the rodless cavity 101 and a rod connecting space 104 connected to the rod cavity 102. The extending flow channel 310 is connected to the rodless connecting space 103, and the retracting flow channel 320 is connected to the rod connecting space 104.

[0057] The working principle of the pressure-maintaining assembly 500 is further explained below by taking the electro-hydraulic control device performing the extension action as an example: the motor 210 drives the oil pump assembly 220, and the oil first enters the retraction channel 320 from the accommodating chamber 201 through the oil replenishment channel 340 and the pump chamber 330, and is then pumped to the extension channel 310 by the oil pump assembly 220. During this process, the oil pressure in the retraction channel 320 is greater than the oil pressure in the rod chamber 102, and the pressure-maintaining valve 510 in the retraction assembly chamber 321 opens. The oil pressure in the extension channel 310 is greater than the oil pressure in the rodless chamber 101, and the pressure-maintaining valve 510 in the extension assembly chamber 311 opens. At this time, the extension channel 310 and the retraction channel 320 are both in a connected state, the oil in the extension channel 310 can smoothly enter the rodless chamber 101, and the oil in the rod chamber 102 can smoothly flow back to the retraction channel 320, and the hydraulic cylinder 100 begins to extend.

[0058] Example 2

[0059] As an embodiment of the present application, the flow channel structure 300 further includes an oil replenishment channel 340 and an oil outlet channel.

[0060] The oil supply channel 340 connects the pump chamber 330 and the accommodating chamber 201. Figure 13 The oil pump assembly 220 includes a pair of intermeshing oil pump gears 221 and a drive gear 222 driven by the motor 210. The drive gear 222 meshes with one of the oil pump gears 221. The pump chamber 330 includes a main chamber 331 that accommodates the oil pump gear 221 and a side chamber 332 that accommodates the drive gear 222. Two oil replenishment channels 340 are provided: one connecting to the pump chamber 330 and the other connecting to the side chamber 332. These oil replenishment channels 340 ensure that the oil in the pump chamber 330 is always properly filled, thereby improving the efficiency and stability of the oil pumping.

[0061] In this embodiment, the motor 210 is provided with a drive shaft 211, and the drive gear 222 is disposed on the drive shaft 211. The valve seat 400 is provided with a drive groove for the drive shaft 211 to extend into. The drive groove is equipped with a bearing 430, which is sleeved on the drive shaft 211. The bearing 430 can reduce the friction between the drive shaft 211 and the valve seat 400, improve the smoothness of the transmission, and ensure more stable meshing between the drive gear 222 and the oil pump gear 221.

[0062] The oil outlet passages include an extending oil outlet passage 350 and a retracting oil outlet passage 351. The extending oil outlet passage 350 connects the extending flow channel 310 and the accommodating chamber 201, while the retracting oil outlet passage 351 connects the retracting flow channel 320 and the accommodating chamber 201. Both the extending oil outlet passage 350 and the retracting oil outlet passage 351 are equipped with an oil outlet check valve 440 that allows oil to flow from the flow channel structure 300 to the accommodating chamber 201. This ensures that oil can only flow in one direction, from the flow channel structure 300 to the accommodating chamber 201, preventing oil backflow, thereby ensuring stable system pressure and orderly oil flow.

[0063] Specifically, refer to Figure 8 and Figure 17 The oil outlet check valve 440 includes an oil outlet check valve disc 441, an oil outlet check valve block 442, and an oil outlet check spring 444, which are assembled in sequence. A gap is defined between the side of the oil outlet check valve disc 441 and the inner wall of the oil outlet passage, allowing the oil to flow. The oil outlet check valve block 442 is provided with a through groove 443 for the oil to circulate. One end of the oil outlet check spring 444 rests against the inner wall of the accommodating chamber 201, while the other end rests against the oil outlet check valve block 442. Under the action of the oil outlet check spring 444, the oil outlet check valve disc 441 blocks the oil outlet of the oil outlet passage. When the oil pressure within the flow channel structure 300 exceeds a certain value, the oil pressure pushes up the oil outlet check valve disc 441, causing the oil to flow through the gap between the side of the oil outlet check valve disc 441 and the inner wall of the oil outlet passage, and through the through groove 443 on the oil outlet check valve block 442, before entering the accommodating chamber 201.

[0064] Example 3

[0065] As an embodiment of the present application, the flow channel structure 300 also includes a pressure relief flow channel 360. The pressure relief flow channel 360 is arranged on the valve plate 420. The pressure relief flow channel 360 is communicated with the extension assembly cavity 311 and the retraction assembly cavity 321. A flow channel pressure relief valve 450 is installed in the pressure relief flow channel 360. The flow channel pressure relief valve 450 can be manually opened to relieve pressure on the flow channel structure 300. The flow channel pressure relief valve 450 can quickly release the pressure in the system in an emergency, thereby improving the safety and operability of the system. The flow channel pressure relief valve 450 is a spherical plug, which is a conventional technology and will not be described in detail here.

[0066] Example 4

[0067] As an embodiment of the present application, the valve seat 400 is also equipped with an automatic relief valve. The automatic relief valve includes a rodless relief valve 460 and a rod relief valve 461. The rodless relief valve 460 is used to automatically relieve pressure in the rodless chamber 101, and the rod relief valve 461 is used to automatically relieve pressure in the rod chamber 102. The valve seat 400 is provided with a relief channel for assembling the automatic relief valve. The relief channel is divided into a rodless relief channel 370 and a rod relief channel 371 corresponding to the rodless relief valve 460 and the rod relief valve 461. The rodless relief channel 370 connects to the rodless chamber 101, and the rod relief channel 371 connects to the rod chamber 102.

[0068] refer to Figure 7 The automatic relief valve includes a lever 462 and an automatic relief spring 463. A spherical plug is located at the bottom of lever 462. One end of the automatic relief spring 463 rests against the inner wall of the accommodating chamber 201, while the other end rests against lever 462. The spherical plug, activated by the automatic relief spring 463, blocks the relief passage. When the oil pressure in the rod chamber 102 or the rodless chamber 101 exceeds a certain value, the oil pressure pushes up lever 462, causing oil to flow through the relief passage and into the accommodating chamber 201.

[0069] Example 5

[0070] As an embodiment of the present application, the valve seat 400 is equipped with a manual relief valve 470 and two sets of relief check valves 480. Figure 9The manual relief valve 470 includes a control rod 471, two sets of pressure relief rods 472, and a manual relief spring 473. The top of the control rod 471 is exposed from the surface of the oil storage cylinder 200 for easy control. The two sets of pressure relief rods 472 are mounted on the bottom of the control rod 471, and the manual relief spring 473 is used to help the control rod 471 return to its original position. The control rod 471 is equipped with a limit pin 474, and the housing of the oil storage cylinder 200 is provided with a switching groove 202 that cooperates with the limit pin 474. The groove depth of the switching groove 202 is greater at one end than at the other end, and the groove depths at both ends correspond to the closed and open states of the manual relief valve 470, respectively. The valve plate 420 is provided with two sets of manual relief grooves 380 that communicate with the accommodating chamber 201. The two sets of pressure relief rods 472 are respectively mounted in the two sets of manual relief grooves 380. A discharge control groove 106 is provided on the mounting portion 410 corresponding to the manual discharge groove 380, and a pressure relief check valve is assembled within the discharge control groove 106. Two sets of discharge control grooves 106 are connected, one to the rodless chamber 101, and the other to the rod chamber 102. When the manual discharge valve 470 is opened, the pressure relief rod 472 descends and opens the discharge check valve 480, allowing the oil in the hydraulic cylinder 100 cavity to enter the accommodating chamber 201 through the manual discharge groove 380. In this embodiment, the discharge check valve 480 utilizes a spherical plug in conjunction with a discharge check spring, a conventional design that will not be further described here. In the event of an emergency or system failure (e.g., the hydraulic rod 120 cannot be extended or retracted, or the automatic discharge valve fails), operating the manual discharge valve 470 to open the discharge check valve 480 can quickly relieve pressure, allowing the hydraulic rod 120 to retract to its initial position, thereby improving the safety and reliability of the control device.

[0071] The protection scope of the present invention includes but is not limited to the above embodiments. The protection scope of the present invention is based on the claims. Any replacement, deformation, and improvement of the technology that can be easily thought of by those skilled in the art fall within the protection scope of the present invention.

Claims

1. An electro-hydraulic control device, comprising a hydraulic cylinder (100), an oil storage cylinder (200) and a flow channel structure (300); the flow channel structure (300) comprises an extension flow channel (310), a retraction flow channel (320) and a pump chamber (330) communicating with the extension flow channel (310) and the retraction flow channel (320); an oil pump assembly (220) is assembled in the pump chamber (330), and the oil pump assembly (220) is driven by a motor (210) fixed to the oil storage cylinder (200); a piston (110) is assembled in the hydraulic cylinder (100), the piston (110) is connected to a hydraulic rod (120), the piston (110) divides the cavity in the hydraulic cylinder (100) into a rodless cavity (101) and a rod cavity (102), the extension flow channel (310) is communicated with the rodless cavity (101), and the retraction flow channel (320) is communicated with the rod cavity (102); characterized in that The oil storage cylinder (200) is arranged on the side of the hydraulic cylinder (100) to form a T-shaped layout; a mounting portion (410) and an oil storage cavity (105) are provided on the side of the cylinder body of the hydraulic cylinder (100); a valve plate (420) is mounted on the mounting portion (410); the mounting portion (410) and the valve plate (420) are assembled to form a valve seat (400); the flow channel structure (300) is arranged in the valve seat (400); an accommodating cavity (201) for accommodating the valve seat (400) is provided in the oil storage cylinder (200), and the oil storage cavity (105) is communicated with the accommodating cavity (201).

2. An electro-hydraulic control device according to claim 1, characterized in that: The flow channel structure (300) further includes an oil supply flow channel (340), and the oil supply flow channel (340) is connected to the pump chamber (330) and the accommodating chamber (201).

3. The electro-hydraulic control device according to claim 2, characterized in that: The oil pump assembly (220) includes a pair of mutually meshing oil pump gears (221), and a driving gear (222) driven by the motor (210), wherein the driving gear (222) meshes with one of the oil pump gears (221); The pump chamber (330) includes a main chamber (331) for accommodating the oil pump gear (221) and a side chamber (332) for accommodating the drive gear (222); the oil replenishment flow channel (340) has two locations, one connecting to the pump chamber (330) and the other connecting to the side chamber (332).

4. An electro-hydraulic control device according to claim 3, characterized in that: The motor (210) is provided with a drive shaft (211), a drive gear (222) is provided on the drive shaft (211), a drive groove for the drive shaft (211) to extend into is provided on the valve seat (400), a bearing (430) is mounted on the drive groove, and the bearing (430) is sleeved on the drive shaft (211).

5. The electro-hydraulic control device according to claim 1, characterized in that: An extending assembly chamber (311) is provided at one end of the extending flow channel (310) connected to the rodless chamber (101), and a retracting assembly chamber (321) is provided at one end of the retracting flow channel (320) connected to the rod chamber (102). Pressure-maintaining components (500) are both installed in the extending assembly chamber (311) and the retracting assembly chamber (321); when the hydraulic pressure in the flow channel structure (300) is greater than the hydraulic pressure in the hydraulic cylinder (100), the pressure-maintaining component (500) is opened; when the hydraulic pressure in the hydraulic cylinder (100) is greater than the hydraulic pressure in the flow channel structure (300), the pressure-maintaining component (500) is closed.

6. The electro-hydraulic control device according to claim 5, characterized in that: A pressure relief flow channel (360) is provided on the valve plate (420), and the pressure relief flow channel (360) is communicated with the extension assembly cavity (311) and the retraction assembly cavity (321). A flow channel pressure relief valve (450) is installed in the pressure relief flow channel (360), and the flow channel structure (300) can be pressure-relieved by manually opening the flow channel pressure relief valve (450).

7. The electro-hydraulic control device according to claim 1, characterized in that: The flow channel structure (300) further comprises an extended oil outlet channel (350) and a retracted oil outlet channel (351), wherein the extended oil outlet channel (350) is connected to the extended flow channel (310) and the accommodating chamber (201), and the retracted oil outlet channel (351) is connected to the retracted flow channel (320) and the accommodating chamber (201); and each of the extended oil outlet channel (350) and the retracted oil outlet channel (351) is equipped with an oil outlet one-way valve (440) that allows oil to flow from the flow channel structure (300) to the accommodating chamber (201).

8. The electro-hydraulic control device according to claim 1, characterized in that: The valve seat (400) is equipped with a manual discharge valve (470) and a discharge check valve (480); The manual relief valve (470) includes a control rod (471), a pressure relief rod (472) and a manual relief spring (473); the pressure relief rod (472) is assembled at the bottom of the control rod (471), and the manual relief spring (473) is used to help the control rod (471) reset; a limit pin (474) is assembled on the control rod (471), and a switching slide (202) that matches the limit pin (474) is provided on the shell of the oil storage cylinder (200); the groove depth of one end of the switching slide (202) is greater than the groove depth of the other end, and the groove depths at both ends correspond to the closed state and the open state of the manual relief valve (470) respectively; A manual drain groove (380) communicating with the accommodating chamber (201) is provided on the valve plate (420), and a pressure relief rod (472) is located in the manual drain groove (380); a drain control groove (106) is provided on the mounting portion (410) corresponding to the manual drain groove (380), and a pressure relief one-way valve is located in the drain control groove (106); when the manual drain valve (470) is opened, the pressure relief rod (472) descends and opens the drain one-way valve (480), and the oil in the cavity of the hydraulic cylinder (100) enters the accommodating chamber (201) through the manual drain groove (380).

9. The electro-hydraulic control device according to claim 1, characterized in that: The valve seat (400) is further equipped with a rodless relief valve (460) and a rod relief valve (461). The rodless relief valve (460) is used to automatically relieve pressure in the rodless chamber (101), and the rod relief valve (461) is used to automatically relieve pressure in the rod chamber (102).

10. The electro-hydraulic control device according to claim 1, characterized in that: A through pipe (130) is installed in the cavity of the hydraulic cylinder (100), and the piston (110) is installed in the through pipe (130). There is a space between the through pipe (130) and the inner wall of the cavity. A spacer ring (140) is installed on the outer wall of the through pipe (130). The spacer ring (140) divides the space into a rodless connection space (103) connected to the rodless cavity (101) and a rod connection space (104) connected to the rod cavity (102). The extending flow channel (310) is connected to the rodless connection space (103), and the retracting flow channel (320) is connected to the rod connection space (104).

Images