Pressing connection device

Abstract

The application discloses a press connection device and relates to the technical field of pressure detection. The press connection device comprises a seat body, at least two cavities arranged in parallel with each other are defined in the seat body, at least two oil holes are formed in the seat body, each cavity is communicated with two oil holes, and at least two valve cores are provided in one-to-one correspondence with the at least two cavities. The valve core is arranged in the corresponding cavity and is configured to move between a closed position for cutting off the corresponding two oil holes and an open position for conducting the corresponding two oil holes. The press connection device needs to be clamped only once when multiple pressure detections are performed, so that the pressure detection efficiency is improved.

Description

Technical Field

[0001] This application relates to the field of pressure detection technology, and in particular to a pressure testing connection device. Background Technology

[0002] The housing of the electro-hydraulic servo mechanism is the core working body. Its internal oil circuit stores and transmits hydraulic fluid, converting it into mechanical energy. During operation, the internal pressure is typically 19–23 MPa. To ensure operational stability and high-pressure sealing, the housing requires pressure testing during assembly. Based on the housing's structural characteristics, the main pressure tests include high-pressure chamber pressure resistance testing, low-pressure chamber pressure resistance testing, and testing the starting pressure values ​​of the actuating components (piston assembly and connecting rod assembly).

[0003] However, in related technologies, the pressure testing connection device has only one communicating chamber inside, which means that the pressure testing connection device needs to be reassembled and disassembled repeatedly when performing different tests, resulting in low testing efficiency. Summary of the Invention

[0004] The main purpose of this application is to propose a pressure-testing connection device, which aims to solve the technical problem of low detection efficiency of pressure-testing connection devices in related technologies.

[0005] To achieve the above objectives, this application proposes a pressure-fitting connection device, comprising: A base body, wherein at least two parallel chambers are defined within the base body, and at least two oil holes are provided in the base body, with each chamber communicating with one of the two oil holes respectively; and At least two valve cores, each corresponding to one of the at least two chambers, wherein the valve cores are disposed in the corresponding chambers and are configured to move between a closed position that blocks the corresponding two oil holes and an open position that connects the corresponding two oil holes.

[0006] In one embodiment, the seat body is further provided with at least two handle holes, and each chamber is directly opposite to and in communication with one of the handle holes; The pressure connection device further includes at least two handles, and the at least two handles correspond one-to-one with at least two valve cores; The valve core includes a core body and a connecting part. The core body moves within the corresponding chamber. The connecting part is connected to the side of the core body near the handle hole and extends along the moving direction of the valve core to pass through the handle hole and connect to the handle.

[0007] In one embodiment, the peripheral wall of the chamber has a stop step, the stop step is arranged away from the handle in the direction of movement of the valve core, the outer peripheral wall of the connecting part is provided with a stop part, and the stop part and the stop step are arranged spaced apart in the direction of movement of the valve core. When the valve core is in the closed position, one end of the core body abuts against the stop step, and the stop part is housed in the cavity and abuts against the end wall of the cavity at the handle hole.

[0008] In one embodiment, the handle hole includes a circular hole portion and two straight hole segments symmetrically arranged on both sides of the circular hole portion and communicating with the circular hole portion, wherein at least a portion of the stop portion passes through the two straight hole segments; The handle is fixedly connected to the valve core, and the valve core is rotatably disposed within the cavity.

[0009] In one embodiment, the connecting part is a shaft-shaped structure, and the diameter of the connecting part is smaller than the diameter of the core body. A radial through hole is provided on the peripheral wall of the connecting part, and a cylindrical pin is fixedly disposed in the radial through hole. At least one end of the cylindrical pin protrudes from the peripheral wall of the handle to form the stop part.

[0010] In one embodiment, the valve core is located in the open position when the stop portion is spaced apart from the core body in the moving direction of the valve core and the core body abuts against the chamber end wall at the handle hole.

[0011] In one embodiment, the seat includes: The base body, wherein at least two receiving grooves are formed on one end face of the base body, and the at least two receiving grooves are arranged parallel to each other; and A cover plate with at least two handle holes is provided through it. The cover plate is fixedly disposed on one end face of the seat body. Each handle hole is directly opposite to and communicates with the corresponding receiving groove so that the cover plate and the receiving groove together define the cavity.

[0012] In one embodiment, the at least two oil holes include at least two first oil holes, each of which corresponds to one of the at least two chambers. The orthographic projection of the first oil hole onto the plane containing the cross-section of the chamber is located within the corresponding chamber so that the first oil hole communicates with the end of the corresponding chamber, and the first oil hole is eccentrically arranged relative to the corresponding chamber. The at least two oil holes also include at least one second oil hole, the orthographic projection of which onto the plane of the cross-section of the chamber is located outside the corresponding chamber, such that the second oil hole extends obliquely to communicate with the middle of the corresponding chamber.

[0013] In one embodiment, the seat has a mating surface that mates with the housing, all the oil holes are formed on the mating surface, and the number of the oil holes is the same as the number of oil passage holes in the housing and corresponds one-to-one with each other. The oil holes are adapted to be sealed and connected to the corresponding oil passage holes.

[0014] In one embodiment, at least two of the chambers include a low-pressure chamber, a high-pressure chamber 1, and a high-pressure chamber 2. In the plane containing the cross-section of the seat body, the centers of the cross-sectional profiles of the low-pressure chamber, the high-pressure chamber 1, and the high-pressure chamber 2 are arranged in a triangle. The second oil hole extends obliquely to communicate with the middle of the low-pressure chamber, the high-pressure chamber one, and the high-pressure chamber two.

[0015] One or more technical solutions proposed in this application have at least the following technical effects: In this application's pressure testing connection device, multiple parallel-arranged chambers and their two connected oil holes form multiple interconnected oil circuits. The valve core in each chamber is configured to move between the closed position of the two corresponding oil holes and the open position of the two corresponding oil holes. Thus, the movement of the valve core can control the opening and closing of the corresponding interconnected oil circuits, thereby realizing the rapid switching of the hydraulic oil circuits of the electro-hydraulic servo mechanism housing. In this way, the pressure testing connection device of this application only needs to be clamped once when performing multiple pressure tests, thereby improving the efficiency of pressure resistance testing. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0017] Figure 1 This is a flowchart of the pressure testing process; Figure 2 A schematic diagram of the pressure-connecting device provided in this application; Figure 3 for Figure 2 The left sectional view of the entire section, wherein the cutting plane is the vertical plane containing the central axis of the high-pressure chamber 1 and the central axis of the high-pressure chamber 2; Figure 4 A schematic diagram of the handle hole of the cover plate of the pressure connection device provided in this application; Figure 5 This is a schematic diagram showing the arrangement of the oil passage holes in the housing connected to the pressure testing connection device of this application; Figure 6 for Figure 2 Top view; Figure 7 This is a schematic diagram showing the arrangement of the three chambers.

[0018] Explanation of icon numbers: 1. Oil passage hole one; 2. Oil passage hole two; 3. Oil passage hole three; 4. Oil passage hole four; 10. Seat body; 11. Seat body; 12. Cover plate; 121. Handle hole; 1211. Round hole section; 1212. Straight hole section; 13. Chamber; 131. Stop step; 13a. Low-pressure chamber; 13b. High-pressure chamber one; 13c. High-pressure chamber two; 14. Oil hole; 141. First oil hole; 142. Second oil hole; 15. First connecting pipe; 20. Valve core; 21. Core body; 22. Connecting part; 23. Cylindrical pin; 30. Handle.

[0019] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0020] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0021] It should be noted that if the embodiments of this application involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0022] Furthermore, if the embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0023] The electro-hydraulic servo mechanism can be structurally divided into four parts: the energy source, the actuator, the control mechanism, and the power amplifier assembly. The housing of the electro-hydraulic servo mechanism is the core working body. Its internal oil circuit stores and transmits hydraulic oil, converting it into mechanical energy. During operation, its internal pressure is typically 19–23 MPa. To ensure its operational stability and high-pressure sealing, the housing requires pressure testing during assembly. Based on the housing's structural characteristics, the main pressure tests include high-pressure chamber pressure resistance testing, low-pressure chamber pressure resistance testing, and testing the starting pressure values ​​of the actuating components (piston assembly and connecting rod assembly). During pressure testing, the electro-hydraulic servo mechanism housing must be loaded onto a pressure testing device, and the hydraulic lines of the device are connected via a pressure testing connection device to transmit the hydraulic pressure from the device to the housing.

[0024] In related technologies, the pressure testing connection device has only one connecting pipe inside, requiring repeated assembly and disassembly for different pressure tests, resulting in low testing efficiency. Furthermore, the excessive number of assembly and disassembly operations poses a risk of damaging the housing. For example, in a single-actuator structure, the electro-hydraulic servo mechanism housing is divided into a high-pressure chamber and a low-pressure chamber. Pressure testing requires separate measurements of the withstand pressure of the high-pressure chamber and the starting pressure of the actuators within each chamber to meet technical specifications. The pressure testing process is as follows: Figure 1As shown, it is easy to see that the number of chamber switching during pressure testing is 4. For a "one-to-two" or "one-to-four" multi-actuator structure, this number needs to be multiplied by the corresponding number of actuators. A "one-to-two" electro-hydraulic servo mechanism requires 8 chamber switching, and a "one-to-four" electro-hydraulic servo mechanism requires 16 chamber switching. The pressurization process requires repeatedly switching the oil supply direction of the high and low pressure chamber oil circuits, achieved by frequently changing the direction of the device, inlet, and outlet. Currently, the pressurization connection device requires repeated disassembly and reassembly of the oil pipe screws and the oil pipes connected to the equipment when switching chambers, resulting in low production efficiency and a risk of damaging the housing appearance and threaded holes during the repeated disassembly and reassembly. Furthermore, the housing has 4 oil passage holes, but the current pressurization connection device only connects two oil holes to the chamber requiring pressure testing. During pressure testing, the other two oil passage holes are not used, but the oil inside them easily overflows onto the housing's mounting surface, causing oil contamination of the product. The entire housing needs to be cleaned subsequently. In summary, although the pressure testing connection device can transfer oil during pressure testing, it has the following drawbacks: (1) Low production efficiency: The simplest single-actuator electro-hydraulic servo mechanism requires four chamber switching during pressure testing. Currently, the pressure testing connection device needs to be disassembled and reassembled every time the chamber is switched and the oil circuit is changed. The process is cumbersome, the production efficiency is extremely low, and the time consumption is long. (2) Risk of product damage: In the industry, the appearance quality requirements of the electro-hydraulic servo mechanism housing are extremely strict. Frequent switching and disassembly may damage the appearance of the housing and the threaded holes of the housing. If large scratches are caused or the threads are severely damaged, the entire housing will be scrapped. (3) Oil contamination of the housing, long rework and cleaning time: When the current pressure testing connection device is used, it is easy to overflow the installation surface, causing the product to be contaminated by oil. The entire housing needs to be cleaned afterward, which requires new manpower and time costs. It can be seen that testing is very time-consuming and labor-intensive when the factory produces a large number of electro-hydraulic servo mechanisms. Therefore, it is necessary to design a device that avoids the above risks and can achieve quick switching of oil pipes without disassembling and reassembling during pressure testing.

[0025] Therefore, this embodiment provides a solution by setting multiple connecting oil circuits controlled by valve cores in the pressure testing connection device, thereby realizing the rapid switching of the hydraulic oil circuit of the electro-hydraulic servo mechanism housing. Thus, the pressure testing connection device of this application only needs to be clamped once when performing multiple pressure tests, thereby improving the pressure resistance test efficiency.

[0026] The technical concept of this application is further illustrated below with reference to some specific embodiments and accompanying drawings.

[0027] Please see Figure 2 and Figure 3 This embodiment proposes a pressure-pressurizing connection device, which includes a base 10 and at least two valve cores 20.

[0028] The seat 10 defines at least two parallel chambers 13, and the seat 10 has at least two oil holes 14. Each chamber 13 is connected to the two oil holes 14. At least two valve cores 20 correspond one-to-one with the at least two chambers 13. The valve cores 20 are located in the corresponding chambers 13, and the valve cores 20 are configured to move between a closed position that blocks the corresponding two oil holes 14 and an open position that connects the corresponding two oil holes 14.

[0029] Specifically, the base 10 serves as the working base of the pressure-pressurizing connection device, and multiple chambers 13 are formed inside it along the vertical direction, so that the multiple chambers 13 are arranged in parallel with each other. The cross-sectional shape of the chambers 13 can be circular or polygonal, and this embodiment is not limited to this. The following description uses a circular cross-sectional shape of the chambers 13 as an example. It can be understood that the number of chambers 13 is determined according to the structure of the shell to be pressure tested and the pressure test item. For example, in a single-acting cylinder structure, since the pressure-pressurizing connection device needs to provide 3 chambers 13 for testing, 3 parallel chambers 13 can be defined in the base 10. Correspondingly, at least two chambers 13 include a low-pressure chamber 13a, a high-pressure chamber 13b, and a high-pressure chamber 13c. In the plane of the cross-section of the base 10, the centers of the cross-sectional contours of the low-pressure chamber 13a, the high-pressure chamber 13b, and the high-pressure chamber 13c are arranged in a triangle. The housing 10 also has at least two oil holes 14, and each chamber 13 is connected to the two oil holes 14 to form a connecting pipeline. One oil hole 14 serves as an oil inlet, and the other oil hole 14 serves as an oil outlet. It is worth mentioning that the oil holes 14 are not always dedicated to a single chamber 13, but can be shared by at least some of the chambers 13 depending on the specific arrangement of the oil passage holes in the housing and the flow direction of the hydraulic oil after entering the housing.

[0030] Each chamber 13 is equipped with a valve core 20, which is movable within the chamber 13 to change the on / off state of the connecting pipeline it is in. The valve core 20 is configured to move between a closed position (isolating the two corresponding oil holes 14) and an open position (connecting the two corresponding oil holes 14). When the valve core 20 is in the closed position, a passage cannot be formed between the oil inlet and outlet, preventing normal oil flow and thus isolating the connecting pipeline of the chamber 13. When the valve core 20 is in the open position, a passage is formed between the oil inlet and outlet, allowing normal oil flow and thus connecting the connecting pipeline of the chamber 13.

[0031] Thus, after the pressure testing connection device is clamped at the valve port of the housing, each chamber 13 in the pressure testing connection device is connected to the corresponding internal cylinder of the housing through the connecting oil hole 14. Then, the movement of the valve core 20 controls the switching between the isolation state and the conduction state of each chamber 13 in the pressure testing connection device. In this way, when it is necessary to test the pressure of a certain internal cylinder in the housing, it is only necessary to move the valve core 20 of the chamber 13 corresponding to that internal cylinder to the open position so that it is connected to that internal cylinder, and move the valve core 20 of the other chambers 13 to the closed position so that the corresponding chamber 13 is not connected to the corresponding internal cylinder of the housing.

[0032] It is easy to see that in this embodiment, the multiple parallel chambers 13 and their connected oil holes 14 in the pressure testing connection device form multiple connected oil circuits. The valve core 20 in each chamber 13 is configured to move between the closed position of the two corresponding oil holes 14 and the open position of the two corresponding oil holes 14. Thus, the movement of the valve core 20 can control the opening and closing of the corresponding connected oil circuits, thereby realizing the rapid switching of the hydraulic oil circuit of the electro-hydraulic servo mechanism housing. In this way, the pressure testing connection device in this embodiment only needs to be clamped once when performing multiple pressure tests, thereby improving the pressure resistance test efficiency.

[0033] In this embodiment, the movement of the valve core 20 within the chamber 13 can be driven by electromagnetic or motor. Alternatively, in another embodiment, the seat 10 is provided with at least two handle holes 121, each chamber 13 being directly opposite and connected to one handle hole 121. The pressurizing connection device also includes at least two handles 30, each corresponding to one of the valve cores 20. The valve core 20 includes a core body 21 and a connecting portion 22. The core body 21 moves within the corresponding chamber 13, and the connecting portion 22 is connected to the side of the core body 21 near the handle hole 121 and extends along the moving direction of the valve core 20 to pass through the handle hole 121 and connect with the handle 30.

[0034] Specifically, please refer to Figure 2 and Figure 3In this embodiment, the valve core 20 is manually driven. At this time, the seat 10 has a handle hole 121 that is directly opposite to and communicates with the chamber 13. The handle hole 121 is located directly above the chamber 13 and communicates with the upper end face of the chamber 13. It is understood that the diameter of the handle hole 121 is smaller than the diameter of the chamber 13. The valve core 20 includes a core body 21, which is a shaft-like structure. The core body 21 and the chamber 13 form a hole-shaft fit, thereby blocking or releasing the corresponding oil hole 14. A connecting part 22 is connected to the upper end face of the core body 21, and extends vertically to the handle hole 121 directly above the chamber 13 and through the corresponding handle hole 121 to the outside of the seat 10 until it connects with the handle 30. Furthermore, the handle hole 121 and the chamber 13 can be eccentrically arranged or concentrically arranged; this embodiment does not limit this arrangement. In one specific embodiment, to facilitate manual operation of the valve core 20, the handle hole 121 is concentrically arranged with the chamber 13. Thus, in this embodiment, the operator moves the valve core 20 by pulling the handle 30 upwards or pressing the handle 30 downwards. This driving method is simple, convenient, low-cost, and highly reliable.

[0035] Furthermore, since the unused chamber 13 is also subjected to pressure from the oil circuit during the pressure test, it is necessary to ensure that the valve core 20 reliably remains in the isolation position during the pressure test. Alternatively, the pressure connection device may include a handle limiting structure, which can limit the valve core 20 by limiting the handle. Specifically, the handle limiting structure may consist of a limiting rod connected to the outside of the seat 10 by welding or fasteners. The limiting rod extends to the side of the handle, and the limiting rod has two limiting grooves spaced apart along the movement direction of the valve core 20, one corresponding to the closed position and the other to the open position. After the valve core 20 is driven to the corresponding position by the handle, the handle itself, or an additional locking pin on the handle, is engaged into the corresponding limiting groove to limit the handle, thereby limiting the position of the valve core 20.

[0036] Alternatively, in one embodiment, the peripheral wall of the chamber 13 has a stop step 131, which is arranged away from the handle 30 in the direction of movement of the valve core 20. The outer peripheral wall of the connecting part 22 is provided with a stop portion, and the stop portion and the stop step 131 are spaced apart in the direction of movement of the valve core 20. When the valve core 20 is in the closed position, one end of the core body 21 abuts against the stop step 131, and the stop portion is accommodated in the chamber 13 and abuts against the end wall of the chamber 13 at the handle hole 121.

[0037] Specifically, chamber 13 includes a large-diameter section and a small-diameter section from top to bottom, with a stop step 131 formed between the large-diameter section and the small-diameter section, thereby causing the stop step to be arranged away from the handle 30 in the direction of movement of valve core 20. Core body 21 slides up and down within the large-diameter section. When valve core 20 is in the closed position, core body 21 moves downward to abut against the stop step 131, at which time the stop step 131 achieves lower side limitation of core body 21. The outer peripheral wall of connecting part 22 is provided with a stop part, which protrudes radially from the outer peripheral wall of connecting part 22. When valve core 20 is in the closed position, the stop part is provided protruding from connecting part 22, and the stop part is accommodated within the large-diameter section with its upper end face abutting against the end wall of chamber 13 at handle hole 121, thereby achieving upper side limitation of core body 21.

[0038] Thus, by using the upper and lower limit switches, the valve core 20 cannot move up or down when it is in the closed position, thereby ensuring that the valve core 20 is reliably in the closed position.

[0039] Of course, the stop portion can be set as one, with one side protruding from the outer peripheral wall of the connecting portion 22, or it can be two, with the two protruding symmetrically from the left and right sides of the outer peripheral wall of the connecting portion 22. It is understandable that the left and right symmetrical arrangement will make the force on the stop portion and the connecting portion 22 more balanced, and can avoid the additional deflection / overturning moment applied to the connecting portion 22 from one side. Therefore, the following explanation will take the example of two stop portions protruding symmetrically from the left and right sides of the outer peripheral wall of the connecting portion 22.

[0040] Furthermore, since the stop portion needs not to affect the vertical movement of the core body 21, in some specific embodiments, the outer peripheral wall of the connecting portion 22 is symmetrically provided with two grooves. The stop portion is a rod, and the middle part of the stop portion is rotatably disposed in the groove. An elastic element is provided between the lower end of the stop portion and the bottom wall of the groove. The elastic element usually drives the lower end to extend out of the groove. In this way, in the natural state, the lower end extends out of the groove and abuts against the end wall of the chamber 13 at the handle hole 121, thereby achieving the upper limit of the core body 21. When the valve core 20 needs to move, the lower end of the stop portion can be retracted into the groove and maintained in this state by pushing the upper end of the stop portion outward and adding a pad between the upper end of the stop portion and the bottom wall of the groove.

[0041] Alternatively, in some other specific implementations, please refer to Figure 4 The handle hole 121 includes a circular hole portion 1211 and two straight hole sections 1212 symmetrically arranged on both sides of the circular hole portion 1211 and communicating with the circular hole portion 1211. The two straight hole sections 1212 are configured to allow at least a portion of the stop portion to pass through. The handle 30 is fixedly connected to the valve core 20, and the valve core 20 is rotatably disposed in the chamber 13.

[0042] Specifically, the handle hole 121 is generally Φ-shaped, comprising a circular hole portion 1211 and two straight hole sections 1212, which are symmetrically arranged on both sides of the central circular hole portion 1211. At this time, the valve core 20 and the handle 30 can rotate together. Therefore, when the valve core 20 is not in the closed position, the stop portion protrudes from the outer peripheral wall of the connecting portion 22, and its orthographic projection on the plane of the handle hole 121 is always completely within the straight hole section 1212, allowing the stop portion to pass through the handle hole 121 along with the connecting portion 22. When the valve core 20 is in the closed position, the handle 30 needs to be rotated together with the valve core 20 by at least a certain angle, so that its orthographic projection on the plane of the handle hole 121 is only partially within the straight hole section 1212 or not at all within the straight hole section 1212. Thus, in the vertical direction, the stop portion abuts against the end wall of the chamber 13 at the handle hole 121 to achieve a limiting position.

[0043] It is easy to see that this embodiment constructs the handle hole 121 into a roughly Φ-shaped hole, and the handle and valve core 20 are rotatable, so that the stop part does not affect the up and down movement of its core body 21. This method has a simple structure and has little impact on the force on the valve core 20 and the handle, and is suitable for use in the field of pressure detection.

[0044] The stop portion can be integrally formed with the connecting portion 22. Its structure is a protrusion on the outer peripheral wall of the connecting portion 22. Alternatively, in one embodiment, the connecting portion 22 is a shaft-shaped structure, and the diameter of the connecting portion 22 is smaller than the diameter of the core body 21. A radial through hole is provided on the peripheral wall of the connecting portion 22. A cylindrical pin 23 is fixedly installed in the radial through hole. At least one end of the cylindrical pin 23 protrudes from the peripheral wall of the handle to form the stop portion.

[0045] Specifically, the cylindrical pin 23 can be fitted into the radial through hole via an interference fit, with one end protruding from the outer peripheral wall of the handle. Please refer to [link / reference]. Figure 3 Alternatively, both ends of the stop portion may protrude from the outer peripheral wall of the handle to form a stop portion. Compared to when the stop portion and the connecting portion 22 are integrally formed, where stress is concentrated at the junction of the protruding stop portion and the outer peripheral wall of the connecting portion 22, in this embodiment, the force on the stop portion is borne entirely by the cylindrical pin 23 and partially transmitted to the connecting portion 22, resulting in a better stress state.

[0046] In one embodiment, when the stop portion and the core body 21 are spaced apart in the moving direction of the valve core 20, and the core body 21 abuts against the end wall of the chamber 13 at the handle hole 121, the valve core 20 is in the open position.

[0047] Specifically, the operator rotates the handle 30, causing the valve core 20 to move upwards until the upper end face of the core body 21 abuts against the end wall of the chamber 13 at the handle hole 121. At this point, the operator can confirm that the valve core 20 has reached the open position. In this embodiment, this method improves the ergonomics of the device, making it easier for the operator to grasp the position of the valve core 20.

[0048] In one embodiment, the seat 10 includes a seat body 11 and a cover plate 12. The seat body 11 has at least two receiving grooves on one end face, arranged parallel to each other. The cover plate 12 has at least two handle holes 121 extending through it. The cover plate 12 is fixedly disposed on one end face of the seat body 11, and each handle hole 121 is directly opposite and connected to a corresponding receiving groove so that the cover plate 12 and the receiving groove together define a chamber 13.

[0049] Specifically, in this embodiment, the seat 10 includes two parts, one of which is a seat body 11. The seat body 11 has a prism structure, with at least two circular receiving grooves on one end face. The receiving grooves extend in the vertical direction. The upper opening of the receiving groove is covered by a cover plate 12. The cover plate 12 has the aforementioned Φ-shaped handle holes 121, and the circular hole portion 1211 of each handle hole 121 is arranged concentrically with the receiving groove. At this time, the cover plate 12 and the receiving groove together define the chamber 13. The cover plate 12 can be fixed to the upper end face of the seat body 11 by multiple sets of screws. Alternatively, the cover plate 12 can also be installed on the seat body 11 by a sliding groove structure, and the remaining degrees of freedom in the sliding direction can be achieved by fasteners.

[0050] In one embodiment, at least two oil holes 14 include at least two first oil holes 141, each corresponding to at least two chambers 13. The orthographic projection of the first oil hole 141 onto the plane containing the cross-section of the chamber 13 is located within the corresponding chamber 13, such that the first oil hole 141 communicates with the end of the corresponding chamber 13, and the first oil hole 141 is eccentrically arranged relative to the corresponding chamber 13. The at least two oil holes also include at least one second oil hole 142, the orthographic projection of the second oil hole 142 onto the plane containing the cross-section of the chamber 13 is located outside the corresponding chamber 13, such that the second oil hole 142 extends obliquely to communicate with the middle of the corresponding chamber 13.

[0051] Specifically, the peripheral wall of the chamber 13 has a corresponding projected profile on the lower end face of the seat 10. Within this projected profile, a corresponding first oil hole 141 is provided for the chamber 13. Each first oil hole 141 extends in the vertical direction and communicates with the chamber 13 at the lower end face. Thus, at least two first oil holes 141 are provided on the lower end face of the seat 10, and the orthographic projection of each first oil hole 141 on the plane containing the cross-section of the chamber 13 is located within the corresponding chamber 13.

[0052] Understandably, since the pressure-connecting device is a tooling, the specific location of its first oil hole 141 should be determined based on the arrangement of the oil passage holes on the housing. Because the positions of multiple oil passage holes on the housing are relatively concentrated, the multiple first oil holes 141 are eccentrically arranged relative to their corresponding chambers 13 to balance the requirements between the fixed distribution of the oil passage holes on the housing and the spatial distribution of the multiple chambers 13.

[0053] The aforementioned first oil hole 141 is an oil inlet or an oil outlet. The other oil outlet or oil inlet connected to each chamber 13 can be connected to the middle of the chamber 13, so that the stroke of the valve core 20 is approximately from the lower end face of the chamber 13 to the middle, that is, approximately half the length of the chamber 13, to match the two-position valve (open position and closed position) structure of the valve core 20.

[0054] Of course, in order to make the second oil hole 142 communicate with the middle of the corresponding chamber 13, the orthographic projection of the second oil hole 142 on the plane of the cross section of the chamber 13 is located outside the corresponding chamber 13. At this time, the second oil hole 142 can be extended obliquely to communicate with the middle of the corresponding chamber 13.

[0055] In one embodiment, the seat 10 has a mating surface that mates with the housing. All oil holes 14 are formed on the mating surface, and the number of oil holes 14 corresponds to the number of oil passage holes in the housing, with each oil hole 14 being adapted to seal and communicate with its corresponding oil passage hole. For details, please refer to [link to relevant documentation]. Figure 2 and Figure 3 The oil hole 14 is equipped with a sealing ring at the opening of the mating surface to seal and communicate with the corresponding oil passage hole. Thus, in this embodiment, the pressure testing device transfers all (four) oil passage holes on the housing mounting surface, and there will be no oil overflow and contamination of the large housing during the pressure testing process, reducing rework and cleaning.

[0056] Specifically, please refer to Figure 5 In one example, the mounting surface of the housing has four oil passage holes arranged in a diamond shape. Oil passage hole 1 and oil passage hole 4 are located on the left and right sides, respectively. Oil passage hole 2 and oil passage hole 3 are arranged along the front-back direction and located between oil passage hole 1 and oil passage hole 4. Oil passage hole 1 is connected to the low-pressure cylinder inside the housing, oil passage hole 2 is connected to cylinder I chamber, oil passage hole 3 is connected to cylinder II chamber, and oil passage hole 4 is connected to the low-pressure cylinder, cylinder I chamber, and cylinder II chamber. Cylinder I chamber refers to the high-pressure chamber between the connecting rod and the end cap assembly, and cylinder II chamber refers to the high-pressure chamber between the connecting rod and the bushing assembly.

[0057] At this time, please refer to Figure 6 and Figure 7At least two chambers 13 include a low-pressure chamber 13a, a high-pressure chamber 13b, and a high-pressure chamber 13c. On the plane containing the cross-section of the seat body 10, the centers of the cross-sectional profiles of the low-pressure chamber 13a, high-pressure chamber 13b, and high-pressure chamber 13c are arranged in a triangle. Specifically, at least two first oil holes 141 are provided on the lower end face of the seat body 11, communicating with the low-pressure chamber 13a (first oil hole 141-1), the high-pressure chamber 13b (first oil hole 141-2), and the high-pressure chamber 13c (second oil hole 142-3). It is understood that the first oil hole 141-1 is directly opposite and connected to oil passage 1, the first oil hole 141-2 is directly opposite and connected to oil passage 2, and the first oil hole 141-3 is directly opposite and connected to oil passage 3. The lower end face of the base body 11 is also provided with a second oil hole 142. The second oil hole 142 is directly opposite to and connected to the oil passage hole 4, and extends obliquely to connect with the middle of the low-pressure chamber 13a, the high-pressure chamber 13b, and the high-pressure chamber 13c. It can be understood that a first connecting pipe can be opened horizontally between the high-pressure chamber 13b and the high-pressure chamber 13c inside the base body 11, and the second oil hole 142 can extend obliquely to connect with the first connecting pipe 15, and continue to extend obliquely to connect with the low-pressure chamber 13a, thereby realizing the construction of a four-way pipe through the interconnection of the two channels, which is convenient for processing.

[0058] In addition, pressure testing may require testing with other tooling, so other equipment needs to be connected. Therefore, in one embodiment, the side wall of the seat 10 is provided with a side oil hole, which is connected to both the high pressure chamber 13b and the high pressure chamber 13c.

[0059] Specifically, a second connecting pipe can be horizontally opened between the high-pressure chamber 13b and the high-pressure chamber 13c. Then, a side oil hole is opened on the side wall of the base 10, extending perpendicularly to the line connecting the centers of the high-pressure chambers 13b and 13c until it connects with the second connecting pipe between the two chambers. Notably, the second connecting pipe is located above the first connecting pipe 15 in the vertical direction. In this embodiment, the side hole provides a channel for connecting with other equipment / tooling.

[0060] To make it easier to understand, an example is shown below: The mounting surface of the housing has four oil passage holes arranged in a diamond shape. Oil passage hole 1 and oil passage hole 4 are located on the left and right sides, respectively. Oil passage hole 2 and oil passage hole 3 are arranged along the front-back direction and located between oil passage hole 1 and oil passage hole 4. Oil passage hole 1 is connected to the low-pressure oil cylinder inside the housing, oil passage hole 2 is connected to cylinder I chamber, oil passage hole 3 is connected to cylinder II chamber, and oil passage hole 4 is connected to the low-pressure oil cylinder, cylinder I chamber, and cylinder II chamber. Cylinder I chamber refers to the high-pressure chamber between the connecting rod and the end cap assembly, and cylinder II chamber refers to the high-pressure chamber between the connecting rod and the bushing assembly.

[0061] By analyzing the distribution characteristics of the oil circuit within the housing of the electro-hydraulic servo mechanism and the flow direction of the hydraulic oil after entering the housing, the flow trajectory of the hydraulic oil within the housing is obtained. The distribution of the high and low pressure chambers 13a within the housing and the characteristics of each component are analyzed to determine the flow direction of the oil through the high and low pressure chambers 13a. Addressing the limitation of existing single-channel oil circuit pressure connection devices that cannot switch between the high and low pressure chambers 13a, an oil circuit switching device is designed to achieve rapid switching of pressure detection between the high and low pressure chambers 13a within the housing, eliminating the need for repeated disassembly and reassembly. Specifically, in this example, the seat body 11 has a low-pressure chamber 13a, a high-pressure chamber 13b, and a high-pressure chamber 13c arranged parallel to each other. On the plane of the cross-section of the seat body 10, the centers of the cross-sectional contours of the low-pressure chamber 13a, the high-pressure chamber 13b, and the high-pressure chamber 13c are arranged in a triangle. That is, at least two first oil holes 141 are provided on the lower end face of the seat body 11, and are connected to the low-pressure chamber 13a (first oil hole 141-1), the high-pressure chamber 13b (first oil hole 141-2), and the high-pressure chamber 13c (second oil hole 142-3). It can be understood that the first oil hole 141-1 is directly opposite and connected to oil passage hole 1, the first oil hole 141-2 is directly opposite and connected to oil passage hole 2, and the second oil hole 142-3 is directly opposite and connected to oil passage hole 3. The lower end face of the base body 11 is also provided with a second oil hole 142. The second oil hole 142 is directly opposite to and communicates with the oil passage hole 4, and extends obliquely to communicate with the middle of the low-pressure chamber 13a, the high-pressure chamber 13b, and the high-pressure chamber 13c. It can be understood that a first connecting pipe 15 can be opened horizontally between the high-pressure chamber 13b and the high-pressure chamber 13c inside the base body 11, and the second oil hole 142 can extend obliquely to communicate with the first connecting pipe 15, and continue to extend obliquely to communicate with the low-pressure chamber 13a.

[0062] Each of the low-pressure chamber 13a, high-pressure chamber 13b, and high-pressure chamber 23c is equipped with a sliding valve core 20, which includes a core body 21 and a connecting part 22. A cylindrical pin 23 is inserted through the connecting part 22, with both ends of the cylindrical pin 23 protruding from the connecting part 22 and spaced apart from the core body 21 in the vertical direction. Multiple O-rings are spaced apart on the core body 21 in the vertical direction. One O-ring is located above the connection between the second oil hole 142 and the corresponding chamber 13, and another is located below it. The upper end face of the seat body 11 is covered by a cover plate 12. The cover plate 12 has a corresponding Φ-shaped handle hole 121, with a straight section 1212 for the two ends of the cylindrical pin 23 to pass through. The connecting part 22 passes through the corresponding handle hole 121 and connects to a handle.

[0063] The working process in this example is as follows: Pulling up or pressing down the handle 30 will cause the valve core 20 to move up or down. When the valve core of the low-pressure chamber moves up, the valve cores of high-pressure chamber 1 and high-pressure chamber 2 move down. At this time, the oil flow is directed to the low-pressure chamber, allowing for low-pressure chamber pressure resistance testing. When the valve core of high-pressure chamber 1 moves up, the valve core of high-pressure chamber 2 moves down, and the valve core of the low-pressure chamber moves down, the oil flow is directed to high-pressure chamber 1, allowing for pressure resistance testing of cylinder I chamber of the housing. When the valve core of high-pressure chamber 2 moves up, the valve core of high-pressure chamber 1 moves down, and the valve core of the low-pressure chamber moves down, the oil flow is directed to high-pressure chamber 2, allowing for pressure resistance testing of cylinder II chamber. The handle operation status during pressure testing is summarized in the table below.

[0064] The handle connected to the valve core of the high-pressure chamber is labeled Handle I, the handle connected to the valve core of the high-pressure chamber is labeled Handle II, and the handle connected to the valve core of the low-pressure chamber is labeled Handle III. The handle operation states during pressure detection are summarized in Table 1 below based on usage. Table 1. Operation status of the pressure detection handle of the quick switching device Therefore, this embodiment only requires one clamping to complete the rapid switching of the high-pressure chamber (cylinder I chamber and cylinder II chamber) and the low-pressure chamber oil circuit, thereby realizing the rapid switching of the hydraulic oil circuit of the electro-hydraulic servo mechanism housing and improving the pressure resistance testing efficiency.

[0065] In addition, the specific testing process is as follows: After the external installation of the pressure testing device is completed, each pressure resistance test item still needs to be completed with the assistance of a piston pressure gauge and a vacuum oil filling platform. During the low-pressure chamber leak detection process, connect the oil circuit of the piston pressure gauge and the vacuum oil filling platform, control the oil filling pressure between 0.4 and 0.8 MPa, and stop the oil filling when the scalar rod placed on the low-pressure chamber plug moves to the stop position; pressurize the low-pressure chamber of the shell assembly to 4 MPa and maintain it for 1 minute. If there is no oil leakage at the seal of each low-pressure chamber of the large shell assembly, the technical requirements are met.

[0066] During the piston starting pressure test, connect the piston pressure gauge to the oil circuit of the vacuum oil filling platform. Control the oil filling pressure between 0.4 and 0.8 MPa. The oil filling speed should be as slow as possible, the scalar rod should move at a constant speed, and the pressure gauge pointer should not jump significantly throughout the entire stroke. Read the maximum pressure value indicated by the pressure gauge during the piston movement as the piston starting pressure. This pressure value should not exceed 0.12 MPa, which meets the technical requirements.

[0067] During the high-pressure chamber test (cylinder I chamber), oil is filled into the large housing assembly at a pressure of 0.4–0.8 MPa. When the connecting rod reaches the stop position, the oil filling switch is closed. At a pressure not less than 1 MPa, pressure is slowly increased into cylinder I chamber using a piston-type pressure gauge, causing the bushing assembly to embed into the housing. The pressure is then increased to 33 MPa and maintained for 1 minute. If no oil leakage is found at any of the sealing points of the large housing assembly, the technical requirements are met.

[0068] During the high-pressure chamber test (cylinder II chamber), slowly fill cylinder II with oil. When the connecting rod begins to move smoothly, read the maximum pressure value during the entire stroke when the connecting rod reaches its end, and use this as the starting pressure of the connecting rod. The connecting rod should move smoothly and uniformly throughout its stroke, without jamming or jumping. The starting pressure of the connecting rod should not exceed 0.22 MPa. Continue to increase the pressure to 33 MPa and maintain it for 1 minute. Check that there is no oil leakage at any of the sealing parts of the large housing assembly; this indicates that the technical requirements are met.

[0069] During the second high-pressure chamber test (cylinder chamber I), oil is slowly filled into chamber I. When the connecting rod begins to move smoothly, the maximum pressure value within the end stroke of the connecting rod is read as the starting pressure of the connecting rod. The starting pressure of the connecting rod should not exceed 0.22 MPa, and it should move smoothly and uniformly throughout the entire stroke without jamming or jumping, thus meeting the technical requirements.

[0070] It is easy to see that the pressure testing connection device provided in this example can quickly switch chambers during pressure testing without disassembling or reassembling the device; only the handle needs to be plugged in or unplugged, significantly improving production efficiency. Taking the pressure testing of 120 single-actuator electro-hydraulic servo mechanisms as an example, the pressure testing time is reduced from 20 days to 5 days, increasing efficiency by 4 times. Furthermore, requiring only a single clamping operation effectively controls the risk of damage to the housing and threaded holes caused by device disassembly and assembly. In addition, in this specific example, the pressure testing connection device provided in this example connects to all (four) oil passages on the housing mounting surface, preventing oil overflow and contamination of the large housing during the pressure testing process, thus reducing rework and cleaning.

[0071] The above description is merely an exemplary embodiment of this application and does not limit the scope of protection of this application. Any equivalent structural transformations made based on the technical concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the scope of protection of this application.

Claims

1. A pressure-testing connection device, characterized in that, include: A base body, wherein at least two chambers are defined within the base body and arranged parallel to each other, and the base body is provided with at least two oil holes, each of the chambers communicating with the two oil holes respectively; as well as At least two valve cores, each corresponding to one of the at least two chambers, wherein the valve cores are disposed in the corresponding chambers and are configured to move between a closed position that blocks the corresponding two oil holes and an open position that connects the corresponding two oil holes.

2. The pressure-fitting connection device as described in claim 1, characterized in that, The base is also provided with at least two handle holes, and each chamber is directly opposite to and connected to one of the handle holes; The pressure connection device further includes at least two handles, and the at least two handles correspond one-to-one with at least two valve cores; The valve core includes a core body and a connecting part. The core body moves within the corresponding chamber. The connecting part is connected to the side of the core body near the handle hole and extends along the moving direction of the valve core to pass through the handle hole and connect to the handle.

3. The pressure-fitting connection device as described in claim 2, characterized in that, The peripheral wall of the chamber has a stop step, which is arranged away from the handle in the direction of movement of the valve core. The outer peripheral wall of the connecting part is provided with a stop part, and the stop part and the stop step are arranged at a distance in the direction of movement of the valve core. When the valve core is in the closed position, one end of the core body abuts against the stop step, and the stop part is housed in the cavity and abuts against the end wall of the cavity at the handle hole.

4. The pressure-fitting connection device as described in claim 3, characterized in that, The handle hole includes a circular hole portion and two straight hole segments symmetrically arranged on both sides of the circular hole portion and communicating with the circular hole portion, and at least a portion of the stop portion passes through the two straight hole segments; The handle is fixedly connected to the valve core, and the valve core is rotatably disposed within the cavity.

5. The pressure-fitting connection device as described in claim 4, characterized in that, The connecting part is a shaft-shaped structure, and the diameter of the connecting part is smaller than the diameter of the core body. A radial through hole is provided on the peripheral wall of the connecting part, and a cylindrical pin is fixedly installed in the radial through hole. At least one end of the cylindrical pin protrudes from the peripheral wall of the handle to form the stop part.

6. The pressure-fitting connection device as described in claim 4, characterized in that, When the stop portion is spaced apart from the core body in the moving direction of the valve core, and the core body abuts against the chamber end wall at the handle hole, the valve core is in the open position.

7. The pressure-fitting connection device according to any one of claims 2 to 6, characterized in that, The seat body includes: The base body, wherein at least two receiving grooves are formed on one end face of the base body, and the at least two receiving grooves are arranged parallel to each other; and A cover plate with at least two handle holes is provided through it. The cover plate is fixedly disposed on one end face of the seat body. Each handle hole is directly opposite to and communicates with the corresponding receiving groove so that the cover plate and the receiving groove together define the cavity.

8. The pressure-fitting connection device as described in claim 1, characterized in that, The at least two oil holes include at least two first oil holes, each of which corresponds to one of the at least two chambers. The orthographic projection of the first oil hole onto the plane containing the cross-section of the chamber is located within the corresponding chamber so that the first oil hole communicates with the end of the corresponding chamber, and the first oil hole is eccentrically arranged relative to the corresponding chamber. The at least two oil holes also include at least one second oil hole, the orthographic projection of which onto the plane of the cross-section of the chamber is located outside the corresponding chamber, such that the second oil hole extends obliquely to communicate with the middle of the corresponding chamber.

9. The pressure-fitting connection device as described in claim 8, characterized in that, The base has a mating surface that mates with the housing. All the oil holes are opened on the mating surface, and the number of oil holes is the same as the number of oil passage holes in the housing and they correspond one-to-one. The oil holes are adapted to be sealed and connected with the corresponding oil passage holes.

10. The pressure-fitting connection device as described in claim 9, characterized in that, At least two of the chambers include a low-pressure chamber, a high-pressure chamber one, and a high-pressure chamber two. In the plane containing the cross-section of the seat body, the centers of the cross-sectional profiles of the low-pressure chamber, the high-pressure chamber one, and the high-pressure chamber two are arranged in a triangle. The second oil hole extends obliquely to communicate with the middle of the low-pressure chamber, the high-pressure chamber one, and the high-pressure chamber two.

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