A hydraulic booster spool opening detection device and method

Abstract

The application specifically relates to a hydraulic booster valve core opening degree detection device and method, which comprises a rack, a first lifting mechanism, a first positioning mechanism, a first floating mechanism and a second floating mechanism installed on the rack; the bottom end of the second floating mechanism is fixedly connected with a high-pressure pilot valve body of a hydraulic booster valve core; a high-pressure valve seat and a low-pressure valve seat of the hydraulic booster valve core are installed on the second positioning mechanism; the high-pressure valve seat is fixed between the first positioning mechanism and the second positioning mechanism by driving the second positioning mechanism to rise through the first lifting mechanism; the hydraulic booster valve core is pressed to a closed state through the first floating mechanism and the second floating mechanism; the low-pressure valve seat is driven to rise through a second lifting mechanism to simulate the opening operation of the hydraulic booster valve core; and the maximum opening degree between each part of the hydraulic booster valve core is obtained through the displacement of the first floating mechanism and the second floating mechanism.

Description

Technical Field

[0001] This invention belongs to the field of automotive braking system boosters, specifically relating to a device and method for detecting the valve core opening of a hydraulic booster. Background Technology

[0002] A hydraulic power booster is a servo device that uses hydraulic power to assist braking. It works in conjunction with the vehicle's braking system to achieve vehicle braking deceleration and stopping. Its working principle is as follows: when the driver depresses the brake pedal, it pushes the low-pressure valve seat of the hydraulic power booster. This causes the tip of the ejector pin to push the high-pressure pilot valve body away from the high-pressure pilot valve seat, opening the seal between the high-pressure pilot valve body and the high-pressure pilot valve seat. This allows hydraulic oil to enter the inner bore of the high-pressure pilot valve seat and then the inner bore of the high-pressure valve seat, thus balancing the internal and external pressures of the high-pressure valve seat. This prevents the high-pressure pilot valve seat and the high-pressure valve seat from being pressed together due to pressure differences. Further pushing the low-pressure valve seat of the hydraulic power booster, the ejector pin pushes the high-pressure pilot valve seat, opening the seal between the high-pressure pilot valve seat and the high-pressure valve seat, thereby driving the piston in the brake chamber to move, establishing pressure in the brake circuit. The pressure is then output to the vehicle's braking system through the oil outlet to achieve braking deceleration and stopping.

[0003] Therefore, during the production process of hydraulic power boosters, it is necessary to test the maximum opening between the high-pressure pilot valve body and the high-pressure pilot valve seat, as well as the maximum opening between the high-pressure pilot valve seat and the high-pressure valve seat, to ensure that the hydraulic power booster meets the design requirements. In the existing technology, the maximum opening is usually tested by hydraulic oil flow test. By connecting the hydraulic power booster to the test oil circuit, the maximum opening between the high-pressure pilot valve body and the high-pressure pilot valve seat, as well as the maximum opening between the high-pressure pilot valve seat and the high-pressure valve seat, is derived by detecting the hydraulic oil flow during the movement of the hydraulic power booster. However, the maximum opening derived by this method will have errors due to factors such as the amount of hydraulic oil retained in the valve core of the hydraulic power booster. Moreover, after the test, the hydraulic power booster needs to be disassembled, cleaned, and reassembled, which makes the workload of the test large and the test cycle long. The maximum opening may also change after the hydraulic power booster is reassembled, which may further increase the test error. Summary of the Invention

[0004] This invention provides a device and method for detecting the valve core opening of a hydraulic booster, solving the technical problems in the prior art where the maximum opening between the high-pressure pilot valve body and the high-pressure pilot valve seat, and the maximum opening between the high-pressure pilot valve seat and the high-pressure valve seat, derived by using hydraulic oil flow testing, is prone to errors due to factors such as the amount of hydraulic oil retained in the hydraulic booster valve core. Furthermore, after the test, the hydraulic booster needs to be disassembled, cleaned, and reassembled, resulting in a large workload and a long test cycle. The reassembly of the hydraulic booster may also cause changes in the aforementioned maximum opening, potentially further increasing the test error.

[0005] The technical solution adopted in this invention is: a hydraulic booster valve core opening detection device, including a frame and a first lifting mechanism, a first positioning mechanism, a first floating mechanism, a second floating mechanism, a first displacement sensor and a second displacement sensor mounted on the frame; the bottom end of the second floating mechanism is fixedly connected to the high-pressure pilot valve body of the hydraulic booster valve core;

[0006] The first lifting mechanism is provided with a second positioning mechanism. The high-pressure valve seat and the low-pressure valve seat of the hydraulic booster valve core are installed on the second positioning mechanism from top to bottom. The bottom end of the second positioning mechanism is fixedly connected to the second lifting mechanism. The output end of the second lifting mechanism passes through the second positioning mechanism and abuts against the bottom end of the low-pressure valve seat.

[0007] The first lifting mechanism is used to drive the second positioning mechanism to rise, so that the top of the high pressure valve seat abuts against the bottom of the first positioning mechanism, the top of the high pressure pilot valve seat of the hydraulic booster valve core abuts against the bottom of the first floating mechanism, and the sealing surface of the top of the high pressure pilot valve seat abuts against the sealing surface of the bottom of the high pressure pilot valve body.

[0008] The second lifting mechanism is used to drive the low-pressure valve seat to rise, thereby driving the pin of the hydraulic booster valve core to rise, so that the tip of the pin pushes the high-pressure pilot valve body and the second floating mechanism to rise, and the pin pushes the high-pressure pilot valve seat and the first floating mechanism to rise.

[0009] The first displacement sensor is disposed at the top of the first floating mechanism to obtain displacement information of the first floating mechanism, and the second displacement sensor is disposed at the top of the second floating mechanism to obtain displacement information of the second floating mechanism.

[0010] In the above technical solution, after the hydraulic booster valve core is installed on the hydraulic booster valve core opening detection device, the second positioning mechanism is driven to rise by the first lifting mechanism, so that the top of the high pressure valve seat abuts against the bottom of the first positioning mechanism, the top of the high pressure pilot valve seat abuts against the bottom of the first floating mechanism, and the sealing surface of the top of the high pressure pilot valve seat abuts against the sealing surface of the bottom of the high pressure pilot valve body.

[0011] This fixes the high-pressure valve seat between the first positioning mechanism and the second positioning mechanism; the high-pressure pilot valve seat is in a sealed state with the high-pressure valve seat, and the sealing surface at the top of the high-pressure pilot valve seat and the sealing surface at the bottom of the high-pressure pilot valve body are also in a sealed state (that is, at this time the hydraulic booster valve core is in a closed state, the high-pressure pilot valve seat and the high-pressure valve seat are in a zero-opening state, the sealing surface at the top of the high-pressure pilot valve seat and the sealing surface at the bottom of the high-pressure pilot valve body are also in a zero-opening state, and at the same time, the high-pressure valve seat is fixed).

[0012] Then, the low-pressure valve seat is driven to rise by the second lifting mechanism, which in turn drives the ejector pin to rise. The tip of the ejector pin pushes the high-pressure pilot valve body and the second floating mechanism to rise, and the ejector pin pushes the high-pressure pilot valve seat and the first floating mechanism to rise. This simulates the opening action of the hydraulic booster valve core until both the high-pressure pilot valve body and the high-pressure pilot valve seat rise to their maximum height, so that the opening between the high-pressure pilot valve seat and the high-pressure valve seat reaches its maximum, and the opening between the top of the high-pressure pilot valve seat and the bottom of the high-pressure pilot valve body also reaches its maximum.

[0013] Based on the displacement information of the first floating mechanism obtained from the first displacement sensor, the maximum displacement of the high-pressure pilot valve seat in the vertical direction during the simulated opening action of the hydraulic booster valve core is obtained.

[0014] Based on the displacement information of the second floating mechanism obtained by the second displacement sensor, the maximum displacement of the high-pressure pilot valve body in the vertical direction during the simulated opening action of the hydraulic booster valve core is obtained.

[0015] Since the high-pressure valve seat is always fixed between the first positioning mechanism and the second positioning mechanism, the position of the high-pressure valve seat in the vertical direction is fixed during the above-mentioned simulated opening action of the hydraulic booster valve core.

[0016] Therefore, based on the maximum vertical displacement of the high-pressure pilot valve seat and the maximum vertical displacement of the high-pressure pilot valve body during the simulated opening action of the hydraulic booster valve core, the maximum opening between the high-pressure pilot valve seat and the high-pressure valve body can be obtained.

[0017] Wherein, the maximum opening between the high-pressure pilot valve seat and the high-pressure valve seat is equal to the maximum displacement of the high-pressure pilot valve seat in the vertical direction during the above-described simulated opening action of the hydraulic booster valve core;

[0018] The maximum opening between the high-pressure pilot valve seat and the high-pressure pilot valve body is equal to the maximum vertical displacement of the high-pressure pilot valve body minus the maximum vertical displacement of the high-pressure pilot valve seat during the simulated opening action of the hydraulic booster valve core.

[0019] In summary, the above technical solution allows for the precise determination of the maximum opening between the high-pressure pilot valve body and the high-pressure pilot valve seat, as well as the maximum opening between the high-pressure pilot valve seat and the high-pressure valve seat. Furthermore, after a set of tests, the tested hydraulic booster valve core can be removed entirely by lowering the first and second lifting mechanisms, allowing for immediate testing of the next set of hydraulic booster valve cores without the need for disassembly, cleaning, and reassembly. This solves the problems inherent in existing technologies where the maximum opening between the high-pressure pilot valve body and the high-pressure pilot valve seat, derived from hydraulic oil flow testing, is subject to errors due to factors such as the amount of hydraulic oil retained within the hydraulic booster valve core. Additionally, the existing technology requires disassembly, cleaning, and reassembly of the hydraulic booster after testing, resulting in a large workload, long testing cycle, and the potential for further changes in the maximum opening after reassembly, which could exacerbate testing errors.

[0020] Furthermore, the second positioning mechanism includes a positioning sleeve disposed on the first lifting mechanism. The top end of the positioning sleeve is provided with a first mounting hole. The high-pressure valve seat is sleeved in the first mounting hole. The inner circumferential surface of the first mounting hole cooperates with the outer circumferential surface of the high-pressure valve seat to radially position the high-pressure valve seat.

[0021] The first mounting hole is provided with an inwardly extending stepped surface, which is used to cooperate with the bottom end of the high-pressure valve seat to support the high-pressure valve seat;

[0022] The bottom of the first mounting hole is provided with a second mounting hole, which is connected to the bottom end of the positioning sleeve. The low-pressure valve seat is sleeved in the second mounting hole and can slide up and down along the axial direction of the second mounting hole. The inner circumferential surface of the second mounting hole cooperates with the outer circumferential surface of the low-pressure valve seat to radially position the low-pressure valve seat.

[0023] By setting the positioning sleeve, the radial positioning of the high-pressure valve seat and the low-pressure valve seat is achieved, so that the central axes of the high-pressure valve seat, the low-pressure valve seat and the high-pressure pilot valve body are coaxial.

[0024] Furthermore, the first positioning mechanism includes a first positioning block and a second positioning block fixedly connected to the frame; the bottom end of the first positioning block is used to abut against the top end of the high-pressure valve seat to press the bottom end of the high-pressure valve seat against the step surface; the bottom end of the second positioning block is used to abut against the top end of the positioning sleeve when the bottom end of the high-pressure valve seat abuts against the step surface.

[0025] By including a first positioning block and a second positioning block fixedly connected to the frame, the first positioning mechanism can press the bottom end of the high-pressure valve seat against the step surface when the first lifting mechanism drives the positioning sleeve to rise, thereby eliminating errors that occur in subsequent tests due to the bottom end of the high-pressure valve seat failing to fit tightly against the step surface.

[0026] Meanwhile, when the bottom end of the high-pressure valve seat abuts against the step surface, the bottom end of the second positioning block abuts against the top end of the positioning sleeve; so that when the first lifting mechanism drives the positioning sleeve to rise, the first positioning block will not excessively press the high-pressure valve seat into the positioning sleeve, thus avoiding the high-pressure valve seat from getting stuck in the positioning sleeve or deforming and damaging the high-pressure valve seat due to excessive compression.

[0027] Furthermore, the second positioning mechanism also includes a lifting platform fixedly connected to the first lifting mechanism and a base fixedly connected to the lifting platform; the base is in the shape of a hollow cylinder, and the bottom end of the base is provided with a flange surface for fixed connection with the lifting platform;

[0028] The positioning sleeve is fitted inside the inner hole of the base. The outer circumferential surface of the positioning sleeve matches the inner surface of the inner hole of the base. The bottom end of the inner hole of the base is provided with an inwardly extending flange, which is used to support the positioning sleeve.

[0029] The lifting platform is provided with a through hole, which corresponds to the inner hole of the base; the bottom end of the low-pressure valve seat extends from the bottom end of the positioning sleeve into the through hole, the second lifting mechanism is fixedly connected to the bottom end of the lifting platform, and the output end of the second lifting mechanism extends into the through hole.

[0030] By setting the base, and by having the outer circumferential surface of the positioning sleeve cooperate with the inner surface of the inner hole of the base, radial positioning and support of the positioning sleeve are achieved, further improving the coaxiality of the central axes of the high-pressure valve seat, the low-pressure valve seat and the high-pressure pilot valve body.

[0031] Furthermore, the first lifting mechanism includes a lifting cylinder fixedly installed on the frame, a lifting frame fixedly connected to the output end of the lifting cylinder, a connecting member fixedly connected to the lifting frame, and both the lifting platform and the second lifting mechanism fixedly connected to the connecting member.

[0032] Furthermore, the frame includes an upper platform disposed above the second positioning mechanism, a lower platform disposed below the second lifting mechanism, and a plurality of first columns connecting the upper platform and the lower platform;

[0033] The first lifting mechanism is fixedly installed on the lower platform; the first positioning mechanism is fixedly connected to the bottom end of the upper platform; the first floating mechanism and the second floating mechanism are installed on the upper platform; a second column is provided at the top of the upper platform; the first displacement sensor and the second displacement sensor are both fixedly connected to the second column.

[0034] Furthermore, the first floating mechanism includes a first guide sleeve fixedly connected to the top of the upper platform and a first floating rod sleeved inside the first guide sleeve; the first guide sleeve is used to guide the first floating rod to move up and down reciprocally along its axial direction.

[0035] The top end of the first floating rod is provided with a first limiting block, which is used to contact the top end of the first guide sleeve to restrict the downward movement of the first floating rod;

[0036] The bottom end of the first floating rod extends out of the bottom end of the first guide sleeve and passes through the upper platform; a pressure block is fixedly connected to the bottom end of the first floating rod, and a downwardly extending protrusion is provided on the side of the bottom end of the pressure block near the high-pressure pilot valve body, and the bottom end of the protrusion is used to abut against the top end of the high-pressure pilot valve seat.

[0037] A compression spring is fitted onto the first floating rod, and the compression spring is positioned between the top of the pressure block and the bottom of the upper platform.

[0038] Because the second floating mechanism needs to be connected to the high-pressure pilot valve body, and the central axes of the high-pressure pilot valve body, the high-pressure valve seat, and the low-pressure valve seat need to be coaxial during the test, the second floating mechanism must be positioned to ensure that its central axis is coaxial with that of the high-pressure pilot valve body. Therefore, the first floating mechanism can only be positioned on one side of the second floating mechanism. However, due to space constraints during actual assembly, to ensure that the bottom of the protrusion can abut against the top of the high-pressure pilot valve seat, the protrusion cannot be positioned on the central axis of the first floating rod. This could cause the pressure block to tilt during the rise of the high-pressure pilot valve seat, leading to tilting of the first floating rod, causing test errors, or causing the first floating rod to jam in the first guide sleeve, forcing the test to be interrupted. By using a compression spring that cooperates with the first guide sleeve, the first floating rod and the pressure block can be effectively guided to reciprocate along the axial direction of the first floating rod, thus preventing tilting of the first floating rod during the test.

[0039] Furthermore, the second floating mechanism includes a second guide sleeve fixedly connected to the top of the upper platform and a second floating rod sleeved inside the second guide sleeve; the second guide sleeve is used to guide the second floating rod to move up and down reciprocally along its axial direction;

[0040] The top end of the second floating rod is provided with a second limiting block, which is used to contact the top end of the second guide sleeve to restrict the downward movement of the second floating rod;

[0041] The bottom end of the second floating rod extends out of the bottom end of the second guide sleeve and passes through the upper platform; the top end of the high-pressure pilot valve body is fixedly connected to the bottom end of the second floating rod.

[0042] Furthermore, a third mounting hole is provided at the bottom end of the second floating rod, the top end of the high-pressure pilot valve body is installed in the third mounting hole, the bottom end of the high-pressure pilot valve body extends out of the third mounting hole, and the inner circumferential surface of the third mounting hole cooperates with the outer circumferential surface of the high-pressure pilot valve body.

[0043] An axial airflow hole is provided at the bottom of the third mounting hole. The axial airflow hole extends along the axial direction of the second floating rod into the second limiting block. A radial airflow hole is provided on the side of the second limiting block. The radial airflow hole extends along the radial direction of the second floating rod and communicates with the axial airflow hole. The radial airflow hole is used to connect an external vacuum adsorption pump. The vacuum adsorption pump uses the radial airflow hole and the axial airflow hole to hold the high-pressure pilot valve body tightly in the third mounting hole.

[0044] By employing the above technical solution, the high-pressure pilot valve body is clamped tightly into the third mounting hole, which not only enables the rapid installation of the high-pressure pilot valve body at the bottom end of the second floating rod, but also allows for the rapid disassembly of the high-pressure pilot valve body at the bottom end of the second floating rod by shutting down the vacuum adsorption pump. This further simplifies the installation process and improves the efficiency of the test.

[0045] Based on the hydraulic booster valve spool opening detection device provided by the present invention, the present invention also provides a method for detecting the hydraulic booster valve spool opening, including:

[0046] The hydraulic booster valve core is installed on the hydraulic booster valve core opening detection device; the second positioning mechanism is driven to rise by the first lifting mechanism, so that the top of the high pressure valve seat abuts against the bottom of the first positioning mechanism, the top of the high pressure pilot valve seat abuts against the bottom of the first floating mechanism, and the sealing surface of the top of the high pressure pilot valve seat abuts against the sealing surface of the bottom of the high pressure pilot valve body.

[0047] This fixes the high-pressure valve seat between the first positioning mechanism and the second positioning mechanism; the high-pressure pilot valve seat and the high-pressure valve seat are in a sealed state, and the sealing surface at the top of the high-pressure pilot valve seat and the sealing surface at the bottom of the high-pressure pilot valve body are also in a sealed state.

[0048] Then, the low-pressure valve seat is driven to rise by the second lifting mechanism, which in turn drives the ejector pin to rise. The tip of the ejector pin pushes the high-pressure pilot valve body and the second floating mechanism to rise, and the ejector pin pushes the high-pressure pilot valve seat and the first floating mechanism to rise. This simulates the opening action of the hydraulic booster valve core until both the high-pressure pilot valve body and the high-pressure pilot valve seat rise to their maximum height, so that the opening between the high-pressure pilot valve seat and the high-pressure valve seat reaches its maximum, and the opening between the high-pressure pilot valve seat and the high-pressure pilot valve body also reaches its maximum.

[0049] Based on the displacement information of the first floating mechanism obtained from the first displacement sensor, the maximum displacement of the high-pressure pilot valve seat in the vertical direction is obtained during the simulated opening action of the hydraulic booster valve core.

[0050] Based on the displacement information of the second floating mechanism obtained from the second displacement sensor, the maximum displacement of the high-pressure pilot valve body in the vertical direction during the simulated opening action of the hydraulic booster valve core is obtained.

[0051] Based on the above simulation of the opening action of the hydraulic booster valve core, the maximum displacement of the high-pressure pilot valve seat in the vertical direction and the maximum displacement of the high-pressure pilot valve body in the vertical direction are obtained; the maximum opening between the high-pressure pilot valve seat and the high-pressure valve body are obtained.

[0052] Furthermore, this includes the following steps:

[0053] Step 1: Obtain the first initial displacement information of the first floating mechanism at the first initial position through the first displacement sensor, and obtain the second initial displacement information of the second floating mechanism at the second initial position through the second displacement sensor;

[0054] Step 2: Install the hydraulic booster valve core onto the hydraulic booster valve core opening detection device;

[0055] Step 3: Drive the second positioning mechanism to rise through the first lifting mechanism, so that the top of the high-pressure valve seat abuts against the bottom of the first positioning mechanism, the top of the high-pressure pilot valve seat abuts against the bottom of the first floating mechanism, and the sealing surface of the top of the high-pressure pilot valve seat abuts against the sealing surface of the bottom of the high-pressure pilot valve body; acquire the first displacement information of the first floating mechanism at this time through the first displacement sensor, compare the first displacement information with the first initial displacement information to obtain the first rising height of the first floating mechanism relative to the first initial position; acquire the second displacement information of the second floating mechanism at this time through the second displacement sensor, compare the second displacement information with the second initial displacement information to obtain the second rising height of the second floating mechanism relative to the second initial position;

[0056] Step 4: The low-pressure valve seat is driven to rise by the second lifting mechanism, which in turn drives the ejector pin to rise. The tip of the ejector pin pushes the high-pressure pilot valve body and the second floating mechanism to rise, and the ejector pin pushes the high-pressure pilot valve seat and the first floating mechanism to rise. This simulates the opening action of the hydraulic booster valve core until both the high-pressure pilot valve seat and the high-pressure pilot valve body rise to their maximum height. At this time, the third displacement information of the first floating mechanism is obtained by the first displacement sensor. The third displacement information is compared with the first initial displacement information to obtain the third rising height of the first floating mechanism relative to the first initial position. The fourth displacement information of the second floating mechanism is obtained by the second displacement sensor. The fourth displacement information is compared with the second initial displacement information to obtain the fourth rising height of the second floating mechanism relative to the second initial position.

[0057] Step 5: Subtract the first rise height from the third rise height to obtain the first height difference, and subtract the second rise height from the fourth rise height to obtain the second height difference. In the above simulation of the opening action of the hydraulic booster valve core, the maximum displacement of the high-pressure pilot valve seat in the vertical direction is equal to the first height difference; the maximum displacement of the high-pressure pilot valve body in the vertical direction is equal to the second height difference.

[0058] The maximum opening between the high-pressure pilot valve seat and the high-pressure valve body is equal to the first height difference, and the maximum opening between the high-pressure pilot valve seat and the high-pressure pilot valve body is equal to the second height difference minus the first height difference. Attached Figure Description

[0059] Figure 1 This is a schematic diagram of the hydraulic booster valve core in Example 1;

[0060] Figure 2 for Figure 1 A magnified view of a portion of the image;

[0061] Figure 3 This is a schematic diagram of the hydraulic booster valve core opening detection device in Example 1;

[0062] Figure 4 for Figure 3 A magnified view of a portion of the image;

[0063] Figure 5 This is a schematic diagram of the assembly structure of the second lifting mechanism, the second positioning mechanism, the high-pressure pilot valve body, the high-pressure valve seat, the low-pressure valve seat, the high-pressure pilot valve seat, and the ejector pin in Example 1.

[0064] Figure 6This is a schematic diagram of the assembly structure of the upper platform, the first positioning mechanism, the first floating mechanism, the second floating mechanism, the first displacement sensor, the second displacement sensor, and the high-pressure pilot valve body in Embodiment 1.

[0065] Among them, 1—frame, 2—first lifting mechanism, 3—first positioning mechanism, 4—first floating mechanism, 5—second floating mechanism, 6—first displacement sensor, 7—second displacement sensor, 8—second positioning mechanism, 9—second lifting mechanism, 10—high pressure pilot valve body, 11—high pressure valve seat, 12—low pressure valve seat, 13—high pressure pilot valve seat, 14—ejector pin;

[0066] 1.1—Upper platform, 1.2—Lower platform, 1.3—First column, 1.4—Second column;

[0067] 2.1—Lifting cylinder; 2.2—Lifting frame; 2.3—Connecting parts;

[0068] 3.1—First positioning block; 3.2—Second positioning block;

[0069] 4.1—First guide sleeve, 4.2—First floating rod, 4.3—First limiting block, 4.4—Pressure block, 4.5—Protrusion, 4.6—Compression spring;

[0070] 5.1—Second guide sleeve; 5.2—Second floating rod; 5.3—Second limiting block; 5.4—Axial airflow hole; 5.5—Radial airflow hole;

[0071] 8.1—Positioning sleeve; 8.2—Lifting platform; 8.3—Base;

[0072] 10.1 — Spherical sealing convex surface;

[0073] 11.1 — Inner conical sealing surface;

[0074] 13.1—Spherical sealing concave surface; 13.2—Outer conical sealing surface;

[0075] 14.1 — Step section. Detailed Implementation

[0076] The technical solutions of the embodiments of the present invention will now be clearly and completely described with reference to the accompanying drawings:

[0077] Example 1:

[0078] like Figure 1 and Figure 2 As shown, the hydraulic booster valve core for opening detection using the hydraulic booster valve core opening detection device provided in this embodiment 1 includes a high-pressure pilot valve body 10, a high-pressure valve seat 11, a low-pressure valve seat 12, a high-pressure pilot valve seat 13, and a ejector pin 14 arranged coaxially.

[0079] The high-pressure pilot valve seat 13 and the ejector pin 14 are both sleeved inside the high-pressure valve seat 11. The outer peripheral surface of the high-pressure pilot valve seat 13 is matched with the inner peripheral surface of the high-pressure valve seat 11, so that the high-pressure pilot valve seat 13 can slide axially back and forth in the inner hole of the high-pressure valve seat 11.

[0080] The top of the high-pressure pilot valve seat 13 is provided with a first sealing surface (the first sealing surface can be provided in various forms, including but not limited to: spherical sealing concave surface, spherical sealing convex surface, inner conical sealing surface, outer conical sealing surface, etc. In this embodiment 1, the first sealing surface is a spherical sealing concave surface 13.1); an oil passage hole is provided in the center of the spherical sealing concave surface 13.1, and the oil passage hole connects the spherical sealing concave surface 13.1 and the inner hole of the high-pressure pilot valve seat 13;

[0081] The high-pressure pilot valve body 10 is disposed on one side of the top end of the high-pressure pilot valve seat 13, and the bottom end of the high-pressure pilot valve body 10 is provided with a second sealing surface (the second sealing surface can be provided in various forms, including but not limited to: spherical sealing concave surface, spherical sealing convex surface, inner conical sealing surface, outer conical sealing surface, etc., but it must be ensured that the first sealing surface and the second sealing surface can cooperate with each other to seal the oil passage. In this embodiment 1, the first sealing surface is a spherical sealing convex surface 10.1). The spherical sealing convex surface 10.1 is used to cooperate with the spherical sealing concave surface 13.1 to seal the oil passage.

[0082] The tip of the ejector pin 14 passes through the inner hole of the high-pressure pilot valve seat 13 from the bottom end of the high-pressure pilot valve seat 13. The tip of the ejector pin 14 is a sharp point used to pass through the oil passage hole, so that the ejector pin 14 can move axially towards the high-pressure pilot valve body 10, pass its tip through the oil passage hole and abut against the spherical sealing convex surface 10.1 of the high-pressure pilot valve body 10, and push the spherical sealing convex surface 10.1 away from the spherical sealing concave surface 13.1 to open the seal of the oil passage hole;

[0083] The center of the ejector pin 14 is provided with a stepped portion 14.1. The outer peripheral surface of the stepped portion 14.1 cooperates with the inner peripheral surface of the high-pressure valve seat 11, so that the ejector pin 14 can slide axially back and forth in the inner hole of the high-pressure valve seat 11. When the side of the stepped portion 14.1 facing the bottom end of the high-pressure pilot valve seat 13 contacts the bottom end of the high-pressure pilot valve seat 13, the tip of the ejector pin 14 pushes the opening between the spherical sealing convex surface 10.1 and the spherical sealing concave surface 13.1 (that is, the opening between the high-pressure pilot valve body 10 and the high-pressure pilot valve seat 13) to the maximum opening.

[0084] The top end of the high-pressure pilot valve seat 13 extends beyond the inner hole of the high-pressure valve seat 11 and is provided with an outwardly extending flange. The radius of the outer circumferential surface of the flange is larger than the radius of the inner hole of the high-pressure valve seat 11. A third sealing surface is provided on the side of the flange facing the high-pressure valve seat 11 (the third sealing surface can be provided in various forms, including but not limited to: spherical sealing concave surface, spherical sealing convex surface, inner conical sealing surface, outer conical sealing surface, etc. In this embodiment 1, the third sealing surface is an outer conical sealing surface 13.2). The top of the inner hole of seat 11 is provided with a fourth sealing surface (the fourth sealing surface can be provided in various forms, including but not limited to: spherical sealing concave surface, spherical sealing convex surface, inner conical sealing surface, outer conical sealing surface, etc., but it must be ensured that the third sealing surface and the fourth sealing surface can cooperate with each other to seal and isolate the space outside the high pressure valve seat 11 and the gap space between the outer peripheral surface of the high pressure pilot valve seat 13 and the inner peripheral surface of the high pressure valve seat 11. In this embodiment 1, the fourth sealing surface is an inner conical sealing surface 11.1).

[0085] The low-pressure valve seat 12 is located on one side of the bottom end of the high-pressure valve seat 11. The top end of the low-pressure valve seat 12 is provided with a mounting groove. The bottom end of the ejector pin 14 extends out of the inner hole of the high-pressure valve seat 11 and is sleeved in the mounting groove at the top end of the low-pressure valve seat 12. The bottom end of the low-pressure valve seat 12 is used for power connection with the vehicle's brake pedal. The low-pressure valve seat 12 is used to push the ejector pin 14 to move axially toward the high-pressure pilot valve body 10.

[0086] As the ejector pin 14 moves axially toward the high-pressure pilot valve body 10, the tip of the ejector pin 14 pushes the spherical sealing convex surface 10.1 away from the spherical sealing concave surface 13.1, opening the seal of the oil passage hole. The hydraulic oil in the hydraulic oil chamber on one side of the top of the high-pressure valve seat 11 enters the inner hole of the high-pressure pilot valve seat 13 through the oil passage hole and enters the inner hole of the high-pressure valve seat 11, so that the oil pressure in the inner hole of the high-pressure valve seat 11 and the oil pressure in the hydraulic oil chamber on one side of the top of the high-pressure valve seat 11 tend to be balanced (this also prevents the outer conical sealing surface 13.2 from being pressed against the inner conical sealing surface 11.1 by the oil pressure in the hydraulic oil chamber on one side of the top of the high-pressure valve seat 11). This continues until the tip of the ejector pin 14 reaches the opening between the spherical sealing convex surface 10.1 and the spherical sealing concave surface 13.1 (that is, the opening between the high-pressure pilot valve body 10 and the high-pressure pilot valve body 10). When the valve seat 13 is opened to its maximum opening, the side of the step portion 14.1 facing the bottom end of the high-pressure pilot valve seat 13 contacts the bottom end of the high-pressure pilot valve seat 13. At this time, the ejector pin 14 moves further axially toward the high-pressure pilot valve body 10. Since the oil pressure in the inner hole of the high-pressure valve seat 11 and the oil pressure in the hydraulic oil chamber on the top side of the high-pressure valve seat 11 have reached pressure balance, the step portion 14.1 can push the high-pressure pilot valve seat 13 toward the high-pressure pilot valve body 10, pushing the outer conical sealing surface 13.2 away from the inner conical sealing surface 11.1 (that is, opening the seal between the top end of the high-pressure pilot valve seat 13 and the top end of the high-pressure valve seat 11), thereby pushing the piston of the brake chamber to move, realizing the pressure build-up of the brake circuit, and outputting pressure to the braking device of the whole vehicle through the oil outlet to achieve braking deceleration and stopping.

[0087] Based on the aforementioned hydraulic booster valve core, this embodiment 1 provides a hydraulic booster valve core opening degree detection device, such as... Figure 3 , Figure 4 and Figure 5 As shown, it includes a frame 1 and a first lifting mechanism 2, a first positioning mechanism 3, a first floating mechanism 4, a second floating mechanism 5, a first displacement sensor 6 and a second displacement sensor 7 mounted on the frame 1; the bottom end of the second floating mechanism 5 is fixedly connected to a high-pressure pilot valve body 10 of a hydraulic booster valve core.

[0088] The first lifting mechanism 2 is provided with a second positioning mechanism 8. The high pressure valve seat 11 and the low pressure valve seat 12 of the hydraulic booster valve core are installed on the second positioning mechanism 8 from top to bottom. The bottom end of the second positioning mechanism 8 is fixedly connected to the second lifting mechanism 9. The output end of the second lifting mechanism 9 passes through the second positioning mechanism 8 and abuts against the bottom end of the low pressure valve seat 12.

[0089] The first lifting mechanism 2 is used to drive the second positioning mechanism 8 to rise, so that the top of the high pressure valve seat 11 abuts against the bottom of the first positioning mechanism 3, the top of the high pressure pilot valve seat 13 of the hydraulic booster valve core abuts against the bottom of the first floating mechanism 4, and the sealing surface of the top of the high pressure pilot valve seat 13 abuts against the sealing surface of the bottom of the high pressure pilot valve body 10.

[0090] The second lifting mechanism 9 is used to drive the low-pressure valve seat 12 to rise, thereby driving the pin 14 of the hydraulic booster valve core to rise, so that the tip of the pin 14 pushes the high-pressure pilot valve body 10 and the second floating mechanism 5 to rise, and the pin 14 pushes the high-pressure pilot valve seat 13 and the first floating mechanism 4 to rise.

[0091] The first displacement sensor 6 is disposed at the top of the first floating mechanism 4 to obtain displacement information of the first floating mechanism 4, and the second displacement sensor 7 is disposed at the top of the second floating mechanism 5 to obtain displacement information of the second floating mechanism 5.

[0092] In the above technical solution, the first lifting mechanism 2 drives the second positioning mechanism 8 to rise, so that the top end of the high pressure valve seat 11 abuts against the bottom end of the first positioning mechanism 3, and the high pressure valve seat 11 is pressed between the first positioning mechanism 3 and the second positioning mechanism 8, thereby fixing the high pressure valve seat 11; at the same time, the top end of the high pressure pilot valve seat 13 also abuts against the bottom end of the first floating mechanism 4, and the sealing surface of the top end of the high pressure pilot valve seat 13 (in this embodiment 1, that is, the spherical sealing concave surface 13.1) abuts against the sealing surface of the bottom end of the high pressure pilot valve body 10 (in this embodiment 1, that is, the spherical sealing convex surface 10.1);

[0093] This fixes the high-pressure valve seat 11 between the first positioning mechanism 3 and the second positioning mechanism 8; the high-pressure pilot valve seat 13 and the high-pressure valve seat 11 are in a sealed state (by pressing the top of the high-pressure pilot valve seat 13 against the bottom of the first floating mechanism 4, the outer conical sealing surface 13.2 of the high-pressure pilot valve seat 13 is attached to the inner conical sealing surface 11.1 of the high-pressure valve seat 11, thus sealing the high-pressure pilot valve seat 13 and the high-pressure valve seat 11). The spherical sealing concave surface 13.1 at the top and the spherical sealing convex surface 10.1 at the bottom of the high-pressure pilot valve body 10 are also in a sealing state (that is, at this time the hydraulic booster valve core is in a closed state, the high-pressure pilot valve seat 13 and the high-pressure valve seat 11 are in a zero-opening state, the spherical sealing concave surface 13.1 at the top of the high-pressure pilot valve seat 13 and the spherical sealing convex surface 10.1 at the bottom of the high-pressure pilot valve body 10 are also in a zero-opening state, and at the same time the high-pressure valve seat 11 is fixed).

[0094] Then, the second lifting mechanism 9 drives the low-pressure valve seat 12 to rise, which in turn drives the ejector pin 14 to rise. The tip of the ejector pin 14 pushes the high-pressure pilot valve body 10 and the second floating mechanism 5 to rise, and the ejector pin 14 pushes the high-pressure pilot valve seat 13 and the first floating mechanism 4 to rise. This simulates the opening action of the hydraulic booster valve core until both the high-pressure pilot valve seat 13 and the high-pressure pilot valve body 10 rise to their maximum height (that is, the second lifting mechanism 9 pushes the low-pressure valve seat 12 to the maximum height that the low-pressure valve seat 12 can rise). This allows the opening between the high-pressure pilot valve seat and the high-pressure valve seat to reach its maximum (that is, the opening between the outer conical sealing surface 13.2 of the high-pressure pilot valve seat 13 and the inner conical sealing surface 11.1 of the high-pressure valve seat 11 reaches its maximum), and the opening between the high-pressure pilot valve seat 13 and the high-pressure pilot valve body 10 also reaches its maximum (that is, the opening between the spherical sealing concave surface 13.1 at the top of the high-pressure pilot valve seat 13 and the spherical sealing convex surface 10.1 at the bottom of the high-pressure pilot valve body 10 also reaches its maximum).

[0095] Based on the displacement information of the first floating mechanism 4 obtained by the first displacement sensor 6, the maximum displacement of the high-pressure pilot valve seat 13 in the vertical direction during the opening action of the simulated hydraulic booster valve core is obtained.

[0096] Based on the displacement information of the second floating mechanism 5 obtained by the second displacement sensor 7, the maximum displacement of the high-pressure pilot valve body 10 in the vertical direction during the opening action of the simulated hydraulic booster valve core is obtained.

[0097] Since the high-pressure valve seat 11 is always fixed between the first positioning mechanism 3 and the second positioning mechanism 8, the position of the high-pressure valve seat 11 in the vertical direction is fixed during the opening action of the simulated hydraulic booster valve core.

[0098] Therefore, based on the maximum vertical displacement of the high-pressure pilot valve seat 13 and the maximum vertical displacement of the high-pressure pilot valve body 10 during the simulated opening action of the hydraulic booster valve core, the maximum opening between the high-pressure pilot valve seat 13 and the high-pressure valve seat 11 (in this embodiment 1, that is, the maximum opening between the outer conical sealing surface 13.2 of the high-pressure pilot valve seat 13 and the inner conical sealing surface 11.1 of the high-pressure valve seat 11), and the maximum opening between the high-pressure pilot valve seat 13 and the high-pressure pilot valve body 10 (in this embodiment 1, that is, the maximum opening between the spherical sealing concave surface 13.1 at the top of the high-pressure pilot valve seat 13 and the spherical sealing convex surface 10.1 at the bottom of the high-pressure pilot valve body 10) can be obtained.

[0099] The maximum opening between the high-pressure pilot valve seat 13 and the high-pressure valve seat 11 is equal to the maximum vertical displacement of the high-pressure pilot valve seat 13 during the opening action of the simulated hydraulic booster valve core.

[0100] The maximum opening between the high-pressure pilot valve seat 13 and the high-pressure pilot valve body 10 is equal to the maximum vertical displacement of the high-pressure pilot valve body 10 minus the maximum vertical displacement of the high-pressure pilot valve seat 13 during the opening action of the simulated hydraulic booster valve core.

[0101] In summary, the above technical solution allows for the precise determination of the maximum opening between the high-pressure pilot valve body 10 and the high-pressure pilot valve seat 13, as well as the maximum opening between the high-pressure pilot valve seat 13 and the high-pressure valve seat 11. Furthermore, after a set of tests, the tested hydraulic booster valve core can be removed entirely by lowering the first and second lifting mechanisms, allowing for immediate testing of the next set of hydraulic booster valve cores without the need for disassembly, cleaning, and reassembly. This solves the problems inherent in existing technologies where the maximum opening between the high-pressure pilot valve body and the high-pressure pilot valve seat, derived from hydraulic oil flow testing, is subject to errors due to factors such as the amount of hydraulic oil retained within the hydraulic booster valve core. Additionally, the existing technology requires disassembly, cleaning, and reassembly of the hydraulic booster after testing, resulting in a large workload, long testing cycle, and the potential for further changes in the maximum opening after reassembly, which could exacerbate testing errors.

[0102] Among them, such as Figure 3 , Figure 4 and Figure 5 As shown, the second positioning mechanism 8 includes a positioning sleeve 8.1 disposed on the first lifting mechanism 2. The top end of the positioning sleeve 8.1 is provided with a first mounting hole. The high pressure valve seat 11 is sleeved in the first mounting hole. The inner circumferential surface of the first mounting hole cooperates with the outer circumferential surface of the high pressure valve seat 11 to radially position the high pressure valve seat 11.

[0103] The first mounting hole is provided with an inwardly extending stepped surface, which is used to mate with the bottom end of the high-pressure valve seat 11 to support the high-pressure valve seat 11.

[0104] The bottom of the first mounting hole is provided with a second mounting hole, which is connected to the bottom end of the positioning sleeve 8.1. The low-pressure valve seat 12 is fitted in the second mounting hole and can slide up and down along the axial direction of the second mounting hole. The inner circumferential surface of the second mounting hole cooperates with the outer circumferential surface of the low-pressure valve seat 12 to radially position the low-pressure valve seat 12.

[0105] By setting the positioning sleeve 8.1, the radial positioning of the high-pressure valve seat 11 and the low-pressure valve seat 12 is achieved, making the central axes of the high-pressure valve seat 11, the low-pressure valve seat 12 and the high-pressure pilot valve body 10 coaxial.

[0106] Among them, such as Figure 3 , Figure 4 and Figure 6 As shown, the first positioning mechanism 3 includes a first positioning block 3.1 and a second positioning block 3.2 fixedly connected to the frame 1; the bottom end of the first positioning block 3.1 is used to abut against the top end of the high pressure valve seat 11 to press the bottom end of the high pressure valve seat 11 onto the step surface; the bottom end of the second positioning block 3.2 is used to abut against the top end of the positioning sleeve 8.1 when the bottom end of the high pressure valve seat 11 abuts against the step surface.

[0107] By including a first positioning block 3.1 and a second positioning block 3.2 fixedly connected to the frame 1 in the first positioning mechanism 3, when the first lifting mechanism 2 drives the positioning sleeve 8.1 to rise, the first positioning block 3.1 can abut against the top of the high-pressure valve seat 11, pressing the bottom of the high-pressure valve seat 11 against the step surface; thereby eliminating the error that occurs in subsequent tests due to the bottom of the high-pressure valve seat 11 failing to fit tightly against the step surface.

[0108] Meanwhile, when the bottom end of the high-pressure valve seat 11 abuts against the step surface, the bottom end of the second positioning block 3.2 abuts against the top end of the positioning sleeve 8.1; so that when the first lifting mechanism 2 drives the positioning sleeve 8.1 to rise, the first positioning block 3.1 will not excessively press the high-pressure valve seat 11 into the positioning sleeve 8.1, thus avoiding the high-pressure valve seat 11 from getting stuck in the positioning sleeve 8.1 or causing deformation and damage to the high-pressure valve seat 11 due to excessive compression.

[0109] Among them, such as Figure 3 , Figure 4 and Figure 5 As shown, the second positioning mechanism 8 also includes a lifting platform 8.2 fixedly connected to the first lifting mechanism 2 and a base 8.3 fixedly connected to the lifting platform 8.2; the base 8.3 is in the shape of a hollow cylinder, and the bottom end of the base 8.3 is provided with a flange surface for fixed connection with the lifting platform 8.2;

[0110] The positioning sleeve 8.1 is fitted inside the inner hole of the base 8.3. The outer circumferential surface of the positioning sleeve 8.1 mates with the inner surface of the inner hole of the base 8.3. The bottom end of the inner hole of the base 8.3 is provided with an inwardly extending flange, which is used to support the positioning sleeve 8.1.

[0111] The lifting platform 8.2 is provided with a through hole, which corresponds to the inner hole of the base 8.3; the bottom end of the low-pressure valve seat 12 extends from the bottom end of the positioning sleeve 8.1 into the through hole; the second lifting mechanism 9 is fixedly connected to the bottom end of the lifting platform 8.2, and the output end of the second lifting mechanism 9 extends into the through hole.

[0112] By setting the base 8.3 and cooperating the outer circumferential surface of the positioning sleeve 8.1 with the inner surface of the inner hole of the base 8.3, the radial positioning and support of the positioning sleeve 8.1 are achieved, which further improves the coaxiality of the central axis of the high pressure valve seat 11, the low pressure valve seat 12 and the high pressure pilot valve body 10.

[0113] Among them, such as Figure 3 As shown, the first lifting mechanism 2 includes a lifting cylinder 2.1 fixedly installed on the frame 1. A lifting frame 2.2 is fixedly connected to the output end of the lifting cylinder 2.1. A connecting piece 2.3 is fixedly connected to the lifting frame 2.2. The lifting platform 8.2 and the second lifting mechanism 9 are both fixedly connected to the connecting piece 2.3.

[0114] Among them, such as Figure 3 As shown, the frame 1 includes an upper platform 1.1 disposed above the second positioning mechanism 8, a lower platform 1.2 disposed below the second lifting mechanism 9, and a plurality of first columns 1.3 connecting the upper platform 1.1 and the lower platform 1.2;

[0115] The first lifting mechanism 2 is fixedly installed on the lower platform 1.2; the first positioning mechanism 3 is fixedly connected to the bottom end of the upper platform 1.1; the first floating mechanism 4 and the second floating mechanism 5 are installed on the upper platform 1.1; a second column 1.4 is provided at the top of the upper platform 1.1; the first displacement sensor 6 and the second displacement sensor 7 are both fixedly connected to the second column 1.4.

[0116] Among them, such as Figure 3 , Figure 4 and Figure 6 As shown, the first floating mechanism 4 includes a first guide sleeve 4.1 fixedly connected to the top of the upper platform 1.1 and a first floating rod 4.2 sleeved inside the first guide sleeve 4.1; the first guide sleeve 4.1 is used to guide the first floating rod 4.2 to move up and down reciprocally along its axis;

[0117] The top end of the first floating rod 4.2 is provided with a first limiting block 4.3, which is used to contact the top end of the first guide sleeve 4.1 to restrict the downward movement of the first floating rod 4.2;

[0118] The bottom end of the first floating rod 4.2 extends out of the bottom end of the first guide sleeve 4.1 and passes through the upper platform 1.1; the bottom end of the first floating rod 4.2 is fixedly connected to a pressure block 4.4, and the bottom end of the pressure block 4.4 is provided with a downwardly extending protrusion 4.5 on the side near the high pressure pilot valve body 10, and the bottom end of the protrusion 4.5 is used to abut against the top end of the high pressure pilot valve seat 13;

[0119] A compression spring 4.6 is fitted onto the first floating rod 4.2. The compression spring 4.6 is located between the top of the pressure block 4.4 and the bottom of the upper platform 1.1.

[0120] Because the second floating mechanism 5 needs to be connected to the high-pressure pilot valve body 10, and during the test, the central axes of the high-pressure pilot valve body 10, the high-pressure valve seat 11, and the low-pressure valve seat 12 need to remain coaxial, the second floating mechanism 5 must be positioned to ensure that its central axis is coaxial with that of the high-pressure pilot valve body 10. Therefore, the first floating mechanism 4 can only be positioned on one side of the second floating mechanism 5. Furthermore, due to space constraints during actual assembly, to ensure that the bottom end of the protrusion 4.5 can abut against the top end of the high-pressure pilot valve seat 13, the protrusion 4.5... The setting position cannot be guaranteed to be on the central axis of the first floating rod 4.2. This may cause the pressure block 4.4 to deflect during the rising process of the high-pressure pilot valve seat 13, which in turn may cause the first floating rod 4.2 to deflect, resulting in test errors, or the first floating rod 4.2 to get stuck in the first guide sleeve 4.1, forcing the test to be interrupted. By setting a compression spring 4.6, which cooperates with the first guide sleeve 4.1, the first floating rod 4.2 and the pressure block 4.4 can be effectively guided to reciprocate along the axial direction of the first floating rod 4.2, thereby avoiding the deflection of the first floating rod 4.2 during the test.

[0121] Among them, such as Figure 3 , Figure 4 and Figure 6 As shown, the second floating mechanism 5 includes a second guide sleeve 5.1 fixedly connected to the top of the upper platform 1.1 and a second floating rod 5.2 sleeved inside the second guide sleeve 5.1; the second guide sleeve 5.1 is used to guide the second floating rod 5.2 to move up and down reciprocally along its axis;

[0122] The top end of the second floating rod 5.2 is provided with a second limiting block 5.3, which is used to contact the top end of the second guide sleeve 5.1 to restrict the downward movement of the second floating rod 5.2;

[0123] The bottom end of the second floating rod 5.2 extends out of the bottom end of the second guide sleeve 5.1 and passes through the upper platform 1.1; the top end of the high-pressure pilot valve body 10 is fixedly connected to the bottom end of the second floating rod 5.2.

[0124] Furthermore, a third mounting hole is provided at the bottom end of the second floating rod 5.2. The top end of the high-pressure pilot valve body 10 is installed in the third mounting hole, and the bottom end of the high-pressure pilot valve body 10 extends out of the third mounting hole. The inner circumferential surface of the third mounting hole is matched with the outer circumferential surface of the high-pressure pilot valve body 10.

[0125] An axial airflow hole 5.4 is provided at the bottom of the third mounting hole. The axial airflow hole 5.4 extends axially along the second floating rod 5.2 into the second limiting block 5.3. A radial airflow hole 5.5 is provided on the side of the second limiting block 5.3. The radial airflow hole 5.5 extends radially along the second floating rod 5.2 and communicates with the axial airflow hole 5.4. The radial airflow hole 5.5 is used to connect an external vacuum adsorption pump. The vacuum adsorption pump uses the radial airflow hole 5.5 and the axial airflow hole 5.4 to hold the high-pressure pilot valve body 10 tightly in the third mounting hole.

[0126] By employing the above technical solution, the high-pressure pilot valve body 10 is clamped into the third mounting hole, which not only enables the rapid installation of the high-pressure pilot valve body 10 at the bottom of the second floating rod 5.2, but also enables the rapid disassembly of the high-pressure pilot valve body 10 at the bottom of the second floating rod 5.2 by shutting down the vacuum adsorption pump, further simplifying the installation process of the test and improving the test efficiency.

[0127] Example 2:

[0128] Based on the hydraulic booster valve spool opening detection device provided in Embodiment 1, Embodiment 2 also provides a hydraulic booster valve spool opening detection method, including:

[0129] The hydraulic booster valve core is installed on the hydraulic booster valve core opening detection device; the second positioning mechanism 8 is driven to rise by the first lifting mechanism 2, so that the top of the high pressure valve seat 11 abuts against the bottom of the first positioning mechanism 3, and the high pressure valve seat 11 is pressed between the first positioning mechanism 3 and the second positioning mechanism 8, thus fixing the high pressure valve seat 11; at the same time, the top of the high pressure pilot valve seat 13 is also abutted against the bottom of the first floating mechanism 4, and the sealing surface of the top of the high pressure pilot valve seat 13 (in this embodiment 2, that is, the spherical sealing concave surface 13.1) abuts against the sealing surface of the bottom of the high pressure pilot valve body 10 (in this embodiment 2, that is, the spherical sealing convex surface 10.1).

[0130] This fixes the high-pressure valve seat 11 between the first positioning mechanism 3 and the second positioning mechanism 8; the high-pressure pilot valve seat 13 and the high-pressure valve seat 11 are in a sealed state (by pressing the top of the high-pressure pilot valve seat 13 against the bottom of the first floating mechanism 4, the outer conical sealing surface 13.2 of the high-pressure pilot valve seat 13 is attached to the inner conical sealing surface 11.1 of the high-pressure valve seat 11, thus sealing the high-pressure pilot valve seat 13 and the high-pressure valve seat 11). The spherical sealing concave surface 13.1 at the top and the spherical sealing convex surface 10.1 at the bottom of the high-pressure pilot valve body 10 are also in a sealing state (that is, at this time the hydraulic booster valve core is in a closed state, the high-pressure pilot valve seat 13 and the high-pressure valve seat 11 are in a zero-opening state, the spherical sealing concave surface 13.1 at the top of the high-pressure pilot valve seat 13 and the spherical sealing convex surface 10.1 at the bottom of the high-pressure pilot valve body 10 are also in a zero-opening state, and at the same time the high-pressure valve seat 11 is fixed).

[0131] Then, the second lifting mechanism 9 drives the low-pressure valve seat 12 to rise, which in turn drives the ejector pin 14 to rise. The tip of the ejector pin 14 pushes the high-pressure pilot valve body 10 and the second floating mechanism 5 to rise, and the ejector pin 14 pushes the high-pressure pilot valve seat 13 and the first floating mechanism 4 to rise. This simulates the opening action of the hydraulic booster valve core until both the high-pressure pilot valve seat 13 and the high-pressure pilot valve body 10 rise to their maximum height (that is, the second lifting mechanism 9 pushes the low-pressure valve seat 12 to the maximum height that the low-pressure valve seat 12 can rise). This allows the opening between the high-pressure pilot valve seat and the high-pressure valve seat to reach its maximum (that is, the opening between the outer conical sealing surface 13.2 of the high-pressure pilot valve seat 13 and the inner conical sealing surface 11.1 of the high-pressure valve seat 11 reaches its maximum), and the opening between the high-pressure pilot valve seat 13 and the high-pressure pilot valve body 10 also reaches its maximum (that is, the opening between the spherical sealing concave surface 13.1 at the top of the high-pressure pilot valve seat 13 and the spherical sealing convex surface 10.1 at the bottom of the high-pressure pilot valve body 10 also reaches its maximum).

[0132] Based on the displacement information of the first floating mechanism 4 obtained by the first displacement sensor 6, the maximum displacement of the high-pressure pilot valve seat 13 in the vertical direction during the opening action of the simulated hydraulic booster valve core is obtained.

[0133] Based on the displacement information of the second floating mechanism 5 obtained by the second displacement sensor 7, the maximum displacement of the high-pressure pilot valve body 10 in the vertical direction during the opening action of the simulated hydraulic booster valve core is obtained.

[0134] Since the high-pressure valve seat 11 is always fixed between the first positioning mechanism 3 and the second positioning mechanism 8, the position of the high-pressure valve seat 11 in the vertical direction is fixed during the opening action of the simulated hydraulic booster valve core.

[0135] Therefore, based on the maximum vertical displacement of the high-pressure pilot valve seat 13 and the maximum vertical displacement of the high-pressure pilot valve body 10 during the simulated opening action of the hydraulic booster valve core, the maximum opening between the high-pressure pilot valve seat 13 and the high-pressure valve seat 11 (in this embodiment 2, that is, the maximum opening between the outer conical sealing surface 13.2 of the high-pressure pilot valve seat 13 and the inner conical sealing surface 11.1 of the high-pressure valve seat 11) and the maximum opening between the high-pressure pilot valve seat 13 and the high-pressure pilot valve body 10 (in this embodiment 2, that is, the maximum opening between the spherical sealing concave surface 13.1 at the top of the high-pressure pilot valve seat 13 and the spherical sealing convex surface 10.1 at the bottom of the high-pressure pilot valve body 10) can be obtained.

[0136] The above-mentioned method for detecting the valve core opening of a hydraulic booster can be broken down into the following steps:

[0137] Step 1: Obtain the first initial displacement information of the first floating mechanism 4 at the first initial position through the first displacement sensor 6, and obtain the second initial displacement information of the second floating mechanism 5 at the second initial position through the second displacement sensor 7;

[0138] Step 2: Install the hydraulic booster valve core onto the hydraulic booster valve core opening detection device;

[0139] Step 3: The first lifting mechanism 2 drives the second positioning mechanism 8 to rise, so that the top of the high-pressure valve seat 11 abuts against the bottom of the first positioning mechanism 3, the top of the high-pressure pilot valve seat 13 abuts against the bottom of the first floating mechanism 4, and the spherical sealing concave surface 13.1 at the top of the high-pressure pilot valve seat 13 abuts against the spherical sealing convex surface 10.1 at the bottom of the high-pressure pilot valve body 10; the first displacement information of the first floating mechanism 4 is obtained by the first displacement sensor 6, and the first displacement information is compared with the first initial displacement information to obtain the first rising height of the first floating mechanism 4 relative to the first initial position; the second displacement information of the second floating mechanism 5 is obtained by the second displacement sensor 7, and the second displacement information is compared with the second initial displacement information to obtain the second rising height of the second floating mechanism 5 relative to the second initial position.

[0140] Step 4: The low-pressure valve seat 12 is driven to rise by the second lifting mechanism 9, which in turn drives the ejector pin 14 to rise. The tip of the ejector pin 14 pushes the high-pressure pilot valve body 10 and the second floating mechanism 5 to rise, and the ejector pin 14 pushes the high-pressure pilot valve seat 13 and the first floating mechanism 4 to rise. This continues until both the high-pressure pilot valve seat 13 and the high-pressure pilot valve body 10 have risen to their maximum height. At this time, the third displacement information of the first floating mechanism 4 is obtained by the first displacement sensor 6. The third displacement information is compared with the first initial displacement information to obtain the third rising height of the first floating mechanism 4 relative to the first initial position. The fourth displacement information of the second floating mechanism 5 is obtained by the second displacement sensor 7. The fourth displacement information is compared with the second initial displacement information to obtain the fourth rising height of the second floating mechanism 5 relative to the second initial position.

[0141] Step 5: Subtract the first rise height from the third rise height to obtain the first height difference, and subtract the second rise height from the fourth rise height to obtain the second height difference. In the above simulated hydraulic booster valve core opening action, the maximum displacement of the high-pressure pilot valve seat in the vertical direction is equal to the first height difference; the maximum displacement of the high-pressure pilot valve body in the vertical direction is equal to the second height difference.

[0142] The maximum opening between the high-pressure pilot valve seat and the high-pressure valve seat is equal to the first height difference, and the maximum opening between the high-pressure pilot valve seat and the high-pressure pilot valve body is equal to the second height difference minus the first height difference.

[0143] The hydraulic booster valve core opening detection device and method provided by the present invention have at least the following technical effects or advantages:

[0144] 1. The hydraulic booster valve core opening detection device and method provided by this invention can accurately obtain the maximum opening between the high-pressure pilot valve body 10 and the high-pressure pilot valve seat 13, as well as the maximum opening between the high-pressure pilot valve seat 13 and the high-pressure valve seat 11. After a set of tests is completed, the tested hydraulic booster valve core can be removed as a whole by lowering the first and second lifting mechanisms, and the next set of hydraulic booster valve core tests can be carried out immediately without disassembling, cleaning, and reassembling the hydraulic booster valve core. This solves the technical problem in the prior art that the maximum opening between the high-pressure pilot valve body and the high-pressure pilot valve seat, and the maximum opening between the high-pressure pilot valve seat and the high-pressure valve seat, derived by the hydraulic oil flow test method, will have errors due to factors such as the amount of hydraulic oil remaining in the hydraulic booster valve core. Furthermore, after the test, the hydraulic booster needs to be disassembled, cleaned, and reassembled, which makes the test workload large and the test cycle long. The reassembly of the hydraulic booster may also cause changes in the maximum opening, which may further increase the test error.

[0145] 2. By setting the positioning sleeve 8.1, the radial positioning of the high-pressure valve seat 11 and the low-pressure valve seat 12 is achieved, so that the central axes of the high-pressure valve seat 11, the low-pressure valve seat 12 and the high-pressure pilot valve body 10 are coaxial.

[0146] 3. By including a first positioning block 3.1 and a second positioning block 3.2 fixedly connected to the frame 1 in the first positioning mechanism 3, when the first lifting mechanism 2 drives the positioning sleeve 8.1 to rise, the first positioning block 3.1 can abut against the top of the high-pressure valve seat 11, pressing the bottom of the high-pressure valve seat 11 tightly onto the step surface; thereby eliminating the error that occurs in subsequent tests due to the bottom of the high-pressure valve seat 11 failing to fit tightly against the step surface.

[0147] Meanwhile, when the bottom end of the high-pressure valve seat 11 abuts against the step surface, the bottom end of the second positioning block 3.2 abuts against the top end of the positioning sleeve 8.1; so that when the first lifting mechanism 2 drives the positioning sleeve 8.1 to rise, the first positioning block 3.1 will not excessively press the high-pressure valve seat 11 into the positioning sleeve 8.1, thus avoiding the high-pressure valve seat 11 from getting stuck in the positioning sleeve 8.1 or causing deformation and damage to the high-pressure valve seat 11 due to excessive compression.

[0148] 4. By setting the base 8.3, the outer circumferential surface of the positioning sleeve 8.1 is matched with the inner surface of the inner hole of the base 8.3, which realizes the radial positioning and support of the positioning sleeve 8.1, and further improves the coaxiality of the central axis of the high pressure valve seat 11, the low pressure valve seat 12 and the high pressure pilot valve body 10.

[0149] 5. By setting a compression spring 4.6, which cooperates with the first guide sleeve 4.1, the first floating rod 4.2 and the pressure block 4.4 can be effectively guided to reciprocate along the axial direction of the first floating rod 4.2, thereby preventing the first floating rod 4.2 from deflecting during the test.

[0150] 6. By clamping the high-pressure pilot valve body 10 into the third mounting hole, the high-pressure pilot valve body 10 can be quickly installed at the bottom of the second floating rod 5.2, and the high-pressure pilot valve body 10 can be quickly disassembled at the bottom of the second floating rod 5.2 by turning off the vacuum adsorption pump. This further simplifies the installation process of the test and improves the test efficiency.

[0151] The above are merely specific application examples of the present invention and do not constitute any limitation on the scope of protection of the present invention. All technical solutions formed by equivalent transformation or equivalent substitution fall within the scope of protection of the present invention.

Claims

1. A hydraulic booster spool opening detection device characterized by: The rack and the first lifting mechanism, the first positioning mechanism, the first floating mechanism, the second floating mechanism, the first displacement sensor and the second displacement sensor mounted on the rack; the bottom end of the second floating mechanism is fixedly connected with the high-pressure pilot valve body of the hydraulic booster valve core; The second positioning mechanism is arranged on the first lifting mechanism, and the high-pressure valve seat and the low-pressure valve seat of the hydraulic booster valve core are sequentially mounted on the second positioning mechanism from top to bottom; the bottom end of the second positioning mechanism is fixedly connected with the second lifting mechanism, and the output end of the second lifting mechanism penetrates through the second positioning mechanism and abuts against the bottom end of the low-pressure valve seat; The first lifting mechanism is used for driving the second positioning mechanism to ascend, so that the top end of the high-pressure valve seat abuts against the bottom end of the first positioning mechanism, the top end of the high-pressure pilot valve seat of the hydraulic booster valve core abuts against the bottom end of the first floating mechanism, and the sealing surface at the top end of the high-pressure pilot valve seat abuts against the sealing surface at the bottom end of the high-pressure pilot valve body; The second lifting mechanism is used for driving the low-pressure valve seat to ascend, so that the top pin of the hydraulic booster valve core ascends, the tip of the top pin pushes the high-pressure pilot valve body and the second floating mechanism to ascend, and the top pin pushes the high-pressure pilot valve seat and the first floating mechanism to ascend; The first displacement sensor is arranged at the top end of the first floating mechanism and is used for obtaining displacement information of the first floating mechanism, and the second displacement sensor is arranged at the top end of the second floating mechanism and is used for obtaining displacement information of the second floating mechanism.

2. The hydraulic booster spool opening detection device according to claim 1, characterized by: The second positioning mechanism comprises a positioning sleeve arranged on the first lifting mechanism, a first mounting hole is formed at the top end of the positioning sleeve, the high-pressure valve seat is sleeved in the first mounting hole, and the inner peripheral surface of the first mounting hole is matched with the outer peripheral surface of the high-pressure valve seat to radially position the high-pressure valve seat; A step surface extending inward is arranged in the first mounting hole, and the step surface is matched with the bottom end of the high-pressure valve seat to support the high-pressure valve seat; A second mounting hole is formed at the bottom of the first mounting hole, the second mounting hole is communicated to the bottom end of the positioning sleeve, the low-pressure valve seat is sleeved in the second mounting hole and can slide up and down along the axial direction of the second mounting hole, and the inner peripheral surface of the second mounting hole is matched with the outer peripheral surface of the low-pressure valve seat to radially position the low-pressure valve seat.

3. The hydraulic booster spool opening detection device according to claim 2, characterized by: The first positioning mechanism comprises first and second positioning blocks fixedly connected to the rack; the bottom end of the first positioning block is used for abutting against the top end of the high-pressure valve seat to press the bottom end of the high-pressure valve seat against the step surface; and the bottom end of the second positioning block is used for abutting against the top end of the positioning sleeve when the bottom end of the high-pressure valve seat abuts against the step surface.

4. The hydraulic booster spool opening detection device according to claim 2, characterized by: The second positioning mechanism further comprises a lifting platform fixedly connected to the first lifting mechanism and a base fixedly connected to the lifting platform; the base is in a hollow cylindrical shape, and a flange surface is arranged at the bottom end of the base and is used for fixedly connecting with the lifting platform; The positioning sleeve is sleeved in the inner hole of the base, the outer peripheral surface of the positioning sleeve is matched with the inner side surface of the inner hole of the base, and the inner hole of the base is provided with an inwardly extending flange at the bottom end, which is used for supporting the positioning sleeve; The lifting platform is provided with a through hole corresponding to the inner hole of the base in position; the bottom end of the low-pressure valve seat extends from the bottom end of the positioning sleeve into the through hole; the second lifting mechanism is fixedly connected to the bottom end of the lifting platform, and the output end of the second lifting mechanism extends into the through hole.

5. The hydraulic booster spool opening detection device according to claim 1, characterized by: The rack comprises an upper platform arranged above the second positioning mechanism, a lower platform arranged below the second lifting mechanism, and a plurality of first vertical columns connected between the upper platform and the lower platform. The first lifting mechanism is fixedly installed on the lower platform; the first positioning mechanism is fixedly connected to the bottom end of the upper platform; the first floating mechanism and the second floating mechanism are installed on the upper platform; the top end of the upper platform is provided with a second vertical column, and the first displacement sensor and the second displacement sensor are fixedly connected to the second vertical column.

6. The hydraulic booster spool opening detection device according to claim 5, characterized by: The first floating mechanism comprises a first guide sleeve fixedly connected to the top end of the upper platform and a first floating rod sleeved in the first guide sleeve; the first guide sleeve is used for guiding the first floating rod to reciprocate up and down along the axial direction thereof; The top end of the first floating rod is provided with a first limiting block for contacting the top end of the first guide sleeve to limit the downward movement of the first floating rod; The bottom end of the first floating rod penetrates through the bottom end of the first guide sleeve and the upper platform; the bottom end of the first floating rod is fixedly connected with a pressing block, the bottom end of the pressing block is provided with a downwardly extending protruding portion close to one side of the high-pressure pilot valve body, and the bottom end of the protruding portion is used for abutting against the top end of the high-pressure pilot valve seat; A compression spring is sleeved on the first floating rod and arranged between the top end of the pressing block and the bottom end of the upper platform.

7. The hydraulic booster spool opening detection device according to claim 5, characterized by: The second floating mechanism comprises a second guide sleeve fixedly connected to the top end of the upper platform and a second floating rod sleeved in the second guide sleeve; the second guide sleeve is used for guiding the second floating rod to reciprocate up and down along the axial direction thereof; The top end of the second floating rod is provided with a second limiting block for contacting the top end of the second guide sleeve to limit the downward movement of the second floating rod; The bottom end of the second floating rod penetrates through the bottom end of the second guide sleeve and the upper platform; the top end of the high-pressure pilot valve body is fixedly connected with the bottom end of the second floating rod.

8. The hydraulic booster spool opening detection device according to claim 7, characterized by: The bottom end of the second floating rod is provided with a third mounting hole, the top end of the high-pressure pilot valve body is mounted in the third mounting hole, the bottom end of the high-pressure pilot valve body extends out of the third mounting hole, and the inner peripheral surface of the third mounting hole is matched with the outer peripheral surface of the high-pressure pilot valve body; The third mounting hole is provided with an axial airflow hole at the bottom of the hole, which extends into the second limiting block along the axial direction of the second floating rod. The side surface of the second limiting block is provided with a radial airflow hole, which extends along the radial direction of the second floating rod and communicates with the axial airflow hole. The radial airflow hole is used to connect a vacuum suction air pump. The vacuum suction air pump is tightly sucked into the third mounting hole through the radial airflow hole and the axial airflow hole.

9. A hydraulic booster spool opening detection method characterized by: The hydraulic booster valve core opening degree detection device according to any one of claims 1-8 is adopted to achieve, comprising: The hydraulic booster valve core is installed on the hydraulic booster valve core opening degree detection device; the second positioning mechanism is driven to rise by the first lifting mechanism, so that the top end of the high-pressure valve seat abuts against the bottom end of the first positioning mechanism, the top end of the high-pressure pilot valve seat abuts against the bottom end of the first floating mechanism, and the sealing surface of the top end of the high-pressure pilot valve seat abuts against the sealing surface of the bottom end of the high-pressure pilot valve body; The high-pressure valve seat is fixed between the first positioning mechanism and the second positioning mechanism; the high-pressure pilot valve seat and the high-pressure valve seat are in a sealed state, and the sealing surface of the top end of the high-pressure pilot valve seat and the sealing surface of the bottom end of the high-pressure pilot valve body are also in a sealed state; The low-pressure valve seat is driven to rise by the second lifting mechanism, and the top pin is driven to rise, so that the tip of the top pin pushes the high-pressure pilot valve body and the second floating mechanism to rise, and the top pin pushes the high-pressure pilot valve seat and the first floating mechanism to rise; in this way, the opening operation of the hydraulic booster valve core is simulated, until the high-pressure pilot valve body and the high-pressure pilot valve seat rise to the maximum height, the opening degree between the high-pressure pilot valve seat and the high-pressure valve seat reaches the maximum opening degree, and the opening degree between the high-pressure pilot valve seat and the high-pressure pilot valve body also reaches the maximum opening degree; According to the displacement information of the first floating mechanism obtained by the first displacement sensor, the maximum displacement of the high-pressure pilot valve seat in the vertical direction in the simulation of the opening operation of the hydraulic booster valve core is obtained. According to the displacement information of the second floating mechanism obtained by the second displacement sensor, the maximum displacement of the high-pressure pilot valve body in the vertical direction in the simulation of the opening operation of the hydraulic booster valve core is obtained. According to the maximum displacement of the high-pressure pilot valve seat in the vertical direction and the maximum displacement of the high-pressure pilot valve body in the vertical direction in the simulation of the opening operation of the hydraulic booster valve core, the maximum opening degree between the high-pressure pilot valve seat and the high-pressure valve seat, and the maximum opening degree between the high-pressure pilot valve seat and the high-pressure pilot valve body are obtained.

10. The hydraulic booster spool opening detection method according to claim 9, characterized by: The method comprises the following steps: Step 1: obtaining the first initial displacement information of the first floating mechanism at the first initial position by the first displacement sensor, and obtaining the second initial displacement information of the second floating mechanism at the second initial position by the second displacement sensor; Step 2: obtaining the first displacement information of the first floating mechanism at the first final position by the first displacement sensor, and obtaining the second displacement information of the second floating mechanism at the second final position by the second displacement sensor; Step 2: mounting the hydraulic booster spool on the hydraulic booster spool opening detection device; Step 3: driving the second positioning mechanism to rise by the first lifting mechanism, so that the top end of the high-pressure valve seat abuts against the bottom end of the first positioning mechanism, the top end of the high-pressure pilot valve seat abuts against the bottom end of the first floating mechanism, and the sealing surface of the top end of the high-pressure pilot valve seat abuts against the sealing surface of the bottom end of the high-pressure pilot valve body; obtaining the first displacement information of the first floating mechanism at this time by the first displacement sensor, and comparing the first displacement information with the first initial displacement information to obtain the first rising height of the position of the first floating mechanism relative to the first initial position; obtaining the second displacement information of the second floating mechanism at this time by the second displacement sensor, and comparing the second displacement information with the second initial displacement information to obtain the second rising height of the position of the second floating mechanism relative to the second initial position; Step 4: driving the low-pressure valve seat to rise by the second lifting mechanism, and driving the thimble to rise, so that the tip of the thimble pushes the high-pressure pilot valve body and the second floating mechanism to rise, and the thimble pushes the high-pressure pilot valve seat and the first floating mechanism to rise; in this way, the opening operation of the hydraulic booster spool is simulated, and the high-pressure pilot valve seat and the high-pressure pilot valve body are both raised to the maximum height; at this time, the third displacement information of the first floating mechanism is obtained by the first displacement sensor, and the third displacement information is compared with the first initial displacement information to obtain the third rising height of the position of the first floating mechanism relative to the first initial position; the fourth displacement information of the second floating mechanism is obtained by the second displacement sensor, and the fourth displacement information is compared with the second initial displacement information to obtain the fourth rising height of the position of the second floating mechanism relative to the second initial position; Step 5: obtaining the first height difference by subtracting the first rising height from the third rising height, and obtaining the second height difference by subtracting the second rising height from the fourth rising height; in the simulation of the opening operation of the hydraulic booster spool, the maximum displacement of the high-pressure pilot valve seat in the vertical direction is equal to the first height difference, and the maximum displacement of the high-pressure pilot valve body in the vertical direction is equal to the second height difference; the maximum opening between the high-pressure pilot valve seat and the high-pressure valve seat is equal to the first height difference, and the maximum opening between the high-pressure pilot valve seat and the high-pressure pilot valve body is equal to the second height difference minus the first height difference.

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