A tool-free pressure test bench

Abstract

The present invention relates to a pressure test bench without tooling, belonging to the technical field of pressure test equipment for aviation accessories. It includes an operation table and a robotic arm supported on the operation table. One end of the robotic arm away from the operation table is connected to a pressure head suspended above the operation table. The pressure head can adjust its suspended position and posture through the robotic arm so as to adaptively dock with a workpiece to be tested placed on the operation table. A high-precision limiting mechanism for defining the docking state between the pressure head body and the workpiece to be tested is also provided on the pressure head body of the pressure head. A pressure conversion joint is detachably connected to the lower end of the pressure head body in the axial direction. The high-precision limiting mechanism clamps the workpiece to be tested adaptively and presses the workpiece to be tested against the pressure conversion joint. The present invention can effectively perform non-destructive clamping and docking limit on the workpiece to be tested, thereby ensuring the stability of pressure tight connection and the test accuracy.

Description

Technical Field

[0001] The present invention relates to the technical field of pressure test equipment for aviation accessories, and particularly to a pressure test bench without tooling. Background Art

[0002] When manufacturing an aero-engine, several pipe workpieces such as oil pipelines for lubricating oil transportation and cooling pipelines for transporting cooling medium, as well as bearing seal seats, need to be manufactured in supporting for the development and production of the sealing components of the aero-engine. In order to make the pipelines adapt to the shape of the engine and the contour of the installation chamber of the external sealing product, the pipelines are usually composed of several sections of special-shaped pipe bodies. Therefore, it is necessary to weld and assemble multiple pipe bodies. Due to the extremely high standards required for the manufacturing of aero-engines, the processing and manufacturing of the supporting equipment, pipeline accessories, and bearing seal seats related to aero-engines also need to meet relatively high standards. Therefore, it is necessary to conduct a pressure test on the welded pipe fittings and other accessories to ensure the welding quality, and it is also necessary to conduct a pressure test on the bearing seal seats and other accessories to ensure the structural tightness. That is, it is necessary to conduct a pressure test on multiple oil circuits and gas circuits that make up the aero-engine sealing components.

[0003] However, when conducting a pressure test on the existing pipelines and bearing seal seats, the pressure test equipment needs to design special docking tooling and plugging tooling according to the shape and structure of the product, resulting in a large test cost, a long pressure test cycle, a high overall process complexity, and a large amount of manpower and financial resources. In particular, the openings of products such as pipelines and bearing seal seats usually do not have limiting connection structures such as threads and buckles that are convenient for connecting with the pressure heads of conventional pressure test equipment, resulting in great difficulty in their assembly and docking, and it is difficult to ensure the stability and tightness of the pressure test assembly. In addition, the specially designed special fixtures usually cannot ensure the airtightness of the docking, resulting in poor accuracy of the test data. In addition, aviation accessories usually have singularity, there are no extra redundant specimen parts, and each accessory needs to be tested. Therefore, after the aviation accessories pass the pressure test, they need to be directly assembled and used. Traditional clamping methods usually need to apply a clamping force much greater than the limiting threshold to the workpiece to ensure the stability of the assembly connection. The excessive clamping force is extremely likely to leave scratches on the workpiece or cause the workpiece to be extruded and deformed. The damage-type welding positioning scheme also cannot meet the pressure test requirements of aviation accessories because the intact workpiece cannot be retained. Finally, the existing grasping clamping structures cannot effectively connect the above-mentioned aviation accessories with traditional pressure test equipment, and cannot ensure the stability of the pressure test assembly and the pressure-holding tightness strength while ensuring airtightness, maintaining the docking posture and relative position. In addition, the existing pressure test equipment cannot provide a constant pressure supply during the pressure test process. The fluctuations of hydraulic pressure or air pressure are extremely likely to affect the stability and airtightness of the docking, increasing the difficulty of maintaining the docking posture without damage. Summary of the Invention

[0004] The object of the present invention is to provide a tool-free pressure test bench that can effectively perform non-destructive clamping and docking limit on the workpiece to be tested, thereby ensuring the stability of pressure tight connection and the test accuracy. It solves the problems that the existing conventional pressure test equipment cannot effectively clamp and dock workpieces such as special-shaped welded and assembled pipe fittings and bearing seats related to aero-engines, which do not have limit connection structures such as screw threads and snap fasteners, and cannot ensure the stability and tightness of the pressure test assembly, resulting in poor accuracy of test data, and is also extremely prone to over-clamping, thus causing deformation and damage of the workpiece.

[0005] The technical solution adopted by the present invention is as follows: A tool-free pressure test bench includes an operation table and a robotic arm supported on the operation table. One end of the robotic arm away from the operation table is connected to a pressure head suspended above the operation table. Among them, the pressure head can adjust its suspended position and attitude through the robotic arm so that it can adaptively dock with the workpiece to be tested placed on the operation table; a high-precision limit mechanism capable of defining the docking state between the pressure head main body and the workpiece to be tested is also provided on the pressure head main body, and a pressure conversion joint is detachably connected to the lower end of the pressure head main body in the axial direction. Among them, the high-precision limit mechanism clamps the workpiece to be tested adaptively and presses the workpiece to be tested against the pressure conversion joint at the same time. Its advantage lies in that the high-precision limit mechanism provided in this application can not only clamp the workpiece to be tested adaptively but also pull the workpiece to be tested, so that the workpiece to be tested is pressed against the pressure conversion joint without damage. The high-precision limit mechanism can adaptively clamp tubular workpieces to be tested within a certain size range, and realizes the pulling and positioning of the workpiece to be tested while clamping and limiting, so that the clamped workpiece to be tested can be stably pressed against the pressure conversion joint while ensuring the connection tightness, improving the accuracy of subsequent tests. In addition, the high-precision limit mechanism can protect the outer contour of the clamped workpiece to be tested by the mutual restriction of the clamping force and the pulling and pressing force, avoiding scratches or deformation on the workpiece surface, and improving the safety and non-destructive positioning ability of the test limit.

[0006] According to a preferred embodiment, the pressing head body includes an upper pressing head body and a lower pressing head body that can be coaxially docked to form a through air guide channel and a liquid guide channel. Among them, the upper pressing head body is detachably connected to the robotic arm, and a liquid flow channel and an air flow channel are arranged in parallel in the upper pressing head body; the lower pressing head body is detachably sleeved on the axial lower end of the upper pressing head body, and a diversion channel communicating the liquid flow channel and the air flow channel is arranged inside it. A pressing adapter that can be selectively installed in a normal position or an inverted position is connected to the bottom of the lower pressing head body. The advantage is that the upper pressing head body can be connected to an air circuit or an oil circuit according to requirements, so as to selectively perform flow tests and pressing tests on the workpiece to be tested, realizing the multi-purpose use of the pressing head body, reducing the number of disassembly and assembly times. The workpiece to be tested can complete a variety of different tests at a single clamping station, improving the detection efficiency, and avoiding the risk of damage to the outer shape of the workpiece to be tested caused by multiple tests through frequent disassembly and assembly. In addition, the pressing adapter can be installed in a normal position or an inverted position according to the opening contour of the workpiece to be tested, improving the adaptability and sealing performance of the docking.

[0007] According to a preferred embodiment, the high-precision limit mechanism includes a hook, a hook pull rod, an adjustment lever, and a limit gland. Among them, the top end of the hook is rotatably connected to the hook pull rod, and the axial upper end of the hook pull rod is hung on the adjustment lever. Thus, when the adjustment lever deflects, it can drive the hook pull rod and the hook to lift and lower synchronously; the adjustment lever is rotatably installed on the outer side surface of the upper pressing head body. A limit gland that drives the adjustment lever to deflect is also sleeved on the upper pressing head body, and the limit gland is also threadedly sleeved on the lower pressing head body. The advantage is that the limit gland provided in this application drives the adjustment lever to deflect slightly with high precision by screwing. Thus, the adjustment lever can drive the hook pull rod and the hook to lift and lower, and the hook is also clamped and limited by the limit gland at the same time, so that the hook clamps the workpiece to be tested and pulls the workpiece to be tested to move axially, ensuring the stability of the pressure tight connection of the workpiece to be tested and the pressure holding tightness strength.

[0008] According to a preferred embodiment, multiple hooks are arranged in the outer vertical groove of the lower pressing head body at circumferential intervals, and the hook pull rod is inserted into a through vertical hole communicating with the outer vertical groove in a liftable manner. The advantage is that an inclined slope surface is arranged in the outer vertical groove, so that it can limit the descending hook to present an outwardly supported and unfolded posture.

[0009] According to a preferred embodiment, an outwardly inclined shaft rod is connected to the inclined upper end of the inclined main rod of the adjustment lever, and a rolling bearing body that can roll and abut against the limit gland is sleeved on the outwardly inclined shaft rod.

[0010] According to a preferred embodiment, the inclined lower end of the inclined main rod is further provided with a semi-lunar groove opening upward, so that the axial upper end of the hook pull rod is hung in the semi-lunar groove through a hanging bearing body.

[0011] According to a preferred embodiment, a through hole for inserting the upper body of the pressing head is opened on the top of the limiting pressure cover; an internal thread is also arranged on the inner wall surface of the limiting pressure cover; and an anti-damage limiting step capable of clamping and limiting the hook is also arranged on the inner bottom side of the limiting pressure cover.

[0012] According to a preferred embodiment, a constant pressure delivery component capable of adaptively buffering the fluctuation of the input fluid is connected to the input end of the pressure head, wherein a flow guide cavity is arranged in the outer shell of the constant pressure delivery component, and a variable volume pressure regulating cavity shell and an expansion buffer cavity shell are inserted in parallel on the side of the flow guide cavity, and the variable volume pressure regulating cavity shell is isobarically connected with the expansion buffer cavity shell; an inlet pipe arranged in alignment with the variable volume pressure regulating cavity shell is also inserted on the side of the flow guide cavity, and an outlet pipe is also inserted at the end of the expansion buffer cavity shell away from the flow guide cavity. The advantage is that the fluctuating constant pressure delivery component provided in the present application can buffer the initial impact and abnormal flow fluctuation during flow filling during flow testing or pressure testing, thereby reducing the impact force of the flow on the close contact position and improving the stability and retention ability of the pressure-maintaining close contact.

[0013] According to a preferred embodiment, an automatic pressure-balancing clamping assembly that can selectively clamp the workpiece to be measured is also provided on the operating table. The circular support frame base of the automatic pressure-balancing clamping assembly is embedded in the operating table, and a stepper motor is installed at the bottom of the circular support frame base to drive the slider to translate in the linear guide rail by pushing a rotating force arm and a sliding connecting rod through a slider, so that the clamp heads on multiple sliders cooperate to clamp the workpiece to be measured, wherein the four linear guide rails are embedded on the top surface of the circular support frame base in a circumferentially spaced manner.

[0014] The present invention also provides a pressure test method of a tooling-free pressure test bench, comprising the test bench in the above content, and further comprising the following steps:

[0015] According to the interface shape of the workpiece to be tested, the pressure adapter is adaptively assembled on the pressure head body, and the port of the workpiece to be tested is connected to the pressure adapter;

[0016] The limit pressure cover is screwed so that the lowered limit pressure cover pushes the adjustment lever to deflect, so that the adjustment lever lifts the hook pull rod and the hook, and the multiple hooks cooperate to hold the workpiece to be measured under the limit of the limit pressure cover, so that the workpiece to be measured is pressurized and abuts against the pressing adapter.

[0017] The beneficial effects of the present invention are as follows:

[0018] The pressing head provided in this application can adaptively clamp, position, and limit the workpiece to be tested, achieving effective clamping and docking limit for workpieces with various non-positioning structural features, improving the scope of application and test accuracy. While ensuring the sealed docking between the workpiece to be tested and the pressing adapter, it can effectively maintain the shape of the workpiece to be tested, avoid deformation and damage of the workpiece caused by excessive limiting clamping force, improve the shape protection ability, and enhance the close connection stability. The high-precision limiting mechanism provided in this application can not only adaptively clamp the workpiece to be tested but also pull the workpiece to be tested, enabling the workpiece to be tested to be pressurized and abutted against the pressing adapter without damage. The high-precision limiting mechanism can adaptively clamp tubular workpieces to be tested within a certain size range, and while clamping and limiting, it realizes the pulling and positioning of the workpiece to be tested, enabling the clamped workpiece to be tested to stably abut against the pressing adapter while ensuring connection tightness, improving the accuracy of subsequent tests. In addition, the high-precision limiting mechanism can protect the outer contour of the clamped workpiece to be tested through the mutual restriction of the clamping force and the pulling and abutting force, avoiding scratches or deformation on the workpiece surface. The upper body of the pressing head provided in this application can be connected to the gas path or oil path according to requirements, so as to selectively conduct flow rate tests and pressing tests on the workpiece to be tested, realizing the multi-purpose use of the pressing head body, reducing the number of disassembly and assembly times. The workpiece to be tested can complete various different tests at a single clamping station, improving the detection efficiency and reducing the risk of damage to the workpiece to be tested.

[0019] The constant-pressure conveying component provided in this application can effectively buffer the flow rate fluctuations generated when the pressing fluid is input, effectively reducing the fluid impact caused by the flow rate fluctuations, improving the stability of the fluid pressure, thereby effectively reducing the maximum threshold of the limiting force, enhancing the stability and effect of the sealed docking, and reducing the difficulty of maintaining the docking posture without damage.

[0020] The automatic constant-pressure clamping component provided in this application can effectively limit and clamp large-size workpieces such as sealed bearing seats, and it ensures the constancy of the clamping force through a servo motor whose torque size can be set, avoiding over-clamping and damaging the workpiece. Brief Description of the Drawings

[0021] Figure 1 is a schematic structural diagram of a preferred tool-free pressing test bench proposed by the present invention;

[0022] Figure 2 is a schematic structural diagram of the pressing head of a preferred tool-free pressing test bench proposed by the present invention;

[0023] Figure 3 is a schematic plan view of the pressing head of a preferred tool-free pressing test bench proposed by the present invention at the position of the adjustment lever;

[0024] Figure 4 It is an assembly schematic diagram of a pressure head of a preferred tool - free pressure test bench proposed by the present invention;

[0025] Figure 5 It is an assembly schematic diagram of a pressure head of a preferred tool - free pressure test bench proposed by the present invention when the hook is expanded;

[0026] Figure 6 It is a structural schematic diagram of a pressure head main body of a preferred tool - free pressure test bench proposed by the present invention;

[0027] Figure 7 It is a top view of an adjustment lever of a preferred tool - free pressure test bench proposed by the present invention;

[0028] Figure 8 It is an axial sectional schematic diagram of a limit gland of a preferred tool - free pressure test bench proposed by the present invention;

[0029] Figure 9 It is a structural schematic diagram of a constant - pressure conveying assembly of a preferred tool - free pressure test bench proposed by the present invention;

[0030] Figure 10 It is a structural schematic diagram of an automatic pressure - balancing clamping assembly of a preferred tool - free pressure test bench proposed by the present invention;

[0031] Figure 11 It is a structural schematic diagram of an automatic pressure - balancing clamping assembly of a preferred tool - free pressure test bench proposed by the present invention when the clamping distance is reduced.

[0032] List of reference numerals

[0033] 1: Operating table; 2: Robot arm; 3: Pressing head; 4: Constant pressure conveying component; 5: Automatic pressure balancing clamping component; 31: Pressing head main body; 32: High-precision limiting mechanism; 33: Pressing adapter; 311: Upper pressing head body; 312: Lower pressing head body; 3111: Liquid flow channel; 3112: Air flow channel; 3121: Diversion channel; 3122: Outer vertical groove; 3123: Through vertical hole; 3124: External thread; 321: Hook; 322: Hook pull rod; 323: Position adjusting lever; 324: Limiting gland; 3211: Arc rod body; 3212: Anti-slip abutting block; 3221: Hanging bearing body; 3231: Inclined main rod; 3232: Outward inclined shaft rod; 3233: Rolling bearing body; 3234: Half-moon groove; 3241: Through port; 3242: Internal thread; 3243: Anti-damage limiting step; 331: Large-diameter joint; 332: Small-diameter joint; 41: Outer shell; 42: Diversion cavity pipe; 43: Variable volume pressure regulating cavity shell; 44: Expansion buffer cavity shell; 45: Inflow pipe; 46: Outflow pipe; 431: First cavity pipe; 432: Piston body; 433: Piston rod; 434: Linking cross bar; 441: Second cavity pipe; 442: Elastic expansion ring piece; 443: Ring body inflation auxiliary cavity; 444: Wrapping ring sleeve; 445: Linking rod; 446: Connecting air pipe; 447: Guide slide bar; 448: Inflation port; 51: Circular support base; 52: Stepper motor; 53: Slide block pushing rotary force arm; 54: Sliding link; 55: Slide block; 56: Linear guide rail; 57: Clamping head; 58: Clamping head center fixing frame. Detailed implementation manners

[0034] The following is a detailed description with reference to the accompanying drawings.

[0035] This application provides a tool-free pressing test bench, which includes an operating table 1, a robot arm 2, a pressing head 3, a constant pressure conveying component 4, and an automatic pressure balancing clamping component 5.

[0036] According to Figures 1 to 11A specific implementation manner is shown. A control system and an operating system are integrated on the operation table 1, so that data collection, storage, and display can be performed according to requirements, and it is also convenient for the user to set device parameters and select different working modes according to requirements. On the back side of the operation table 1, there is also connected a robotic arm 2 that can move in multiple directions above the table body and position the working end at different spatial coordinate points. At one end of the robotic arm 2 away from the operation table 1, there is connected a pressure head 3 suspended above the operation table 1. The pressure head 3 can adjust its suspension position and posture through the robotic arm 2, so that it can adaptively dock with the workpiece to be tested placed on the operation table 1. At the input end of the pressure head 3, there is connected a constant-pressure conveying component 4 that can adaptively slow down the fluctuation of the input fluid. On the operation table 1, there is also provided an automatic constant-pressure clamping component 5 that can selectively clamp and maintain the external shape of large-sized workpieces to be tested, such as bearing seal seats. The pressure head 3 provided in this application can adaptively clamp, position, and limit the workpiece to be tested, achieving effective clamping and docking limit for various workpieces without positioning structure features, improving the applicable range and test accuracy. While ensuring the sealed docking of the workpiece to be tested and the pressure conversion joint 33, it can effectively maintain the external shape of the workpiece to be tested, avoid deformation and damage of the workpiece caused by excessive limit clamping force, improve the external shape protection ability, and improve the close contact stability. The constant-pressure conveying component 4 provided in this application can effectively buffer the flow fluctuation generated when the pressure fluid is input, effectively reduce the fluid impact caused by the flow fluctuation, improve the smoothness of the fluid pressure, thereby effectively reducing the maximum threshold of the limit force, improving the stability and effect of the sealed docking, and reducing the difficulty of maintaining the docking posture without damage.

[0037] Preferably, the automatic constant-pressure clamping component 5 provided on the operation table 1 is mainly used for clamping the bearing seal seat with a diameter of φ20mm - φ280mm. Further preferably, on the operation table 1, there is also provided an electromagnet chuck that can perform adsorption positioning on over-sized workpieces with a size exceeding φ280mm. A control system is integrated in the operation table 1, which is convenient for the operator to perform command operations and obtain test data. Further preferably, on the operation table 1, there are also stored several movable plugs made of expandable rubber with different specifications. Thus, when the workpiece to be tested has several openings, the operator can select a suitable rubber movable plug according to requirements to block the redundant openings, thereby ensuring the internal cavity tightness of the workpiece to be tested in the pressure test.

[0038] Preferably, the robotic arm 2 can adopt a multi-segment rotary-connected robotic control arm, enabling it to effectively position the pressing head 3 at any point within a certain spatial range. Preferably, a camera unit is also provided on the robotic arm 2, facilitating full-process video recording of the test process and allowing the operator to review the test based on the video. The camera unit can be arranged at multiple points, facilitating image acquisition of dead zones for human observation and enabling the user to observe the workpiece to be tested from different angles using the image data.

[0039] Further preferably, the operating table 1 can be configured with multiple robotic arms 2 to simultaneously conduct different tests and inspections on multiple pipelines and sealed bearing seats of the engine sealing equipment to be tested, etc., while achieving multi-purpose use of a single machine. This realizes the synchronous execution of multiple test and inspection tasks, effectively shortening the total working duration and enhancing the efficiency of testing and inspection.

[0040] Preferably, a touch screen is provided on the operating table 1, facilitating the observation of data such as oil temperature, pressure, flow rate, and pressure holding time, and also enabling the setting of parameters such as temperature and pressure. The touch screen can also control the opening and closing of the oil and gas circuits. The operating table 1 can also store and output test data. Preferably, a storage slot is also provided on the operating table 1 for storing various specifications of movable plugs made of expandable rubber, so that before conducting a pressure test on the oil and water circuits of the workpiece to be tested, the movable plugs can seal the redundant pipeline openings.

[0041] As Figures 2 to 8 shown, the pressing head 3 includes a pressing head main body 31, a high-precision limiting mechanism 32, and a pressing adapter 33. Preferably, a high-precision limiting mechanism 32 for defining the docking state between the pressing head main body 31 and the workpiece to be tested is provided on the pressing head main body 31. Further preferably, a pressing adapter 33 that can be selectively installed in a normal or inverted position is detachably connected to the lower axial end of the pressing head main body 31. Specifically, the high-precision limiting mechanism 32 presses the workpiece to be tested against the pressing adapter 33 while adaptively clamping the workpiece to be tested, effectively protecting the external shape structure of the workpiece to be tested while ensuring the stability of clamping and positioning and the tightness of limit docking. Further preferably, the pressing adapter 33 is composed of two tubular joints that can be inserted and sleeved together, and the pressing adapter 33 can be disassembled and assembled according to requirements to form docking bodies of different sizes, respectively applicable to two types of tubular workpieces with diameters of 1 - 25 mm and 25 mm - 40 mm. Further preferably, the pressing adapter 33 can be installed in a normal position when the pipe interface of the tubular workpiece is an inner conical surface, and the pressing adapter 33 can be inverted at the bottom of the pressing head main body 31 when the pipe interface of the tubular workpiece is an outer conical surface, so as to adapt to tubular workpieces to be tested with different pipe interface shapes and lumen diameters according to requirements.

[0042] Preferably, the pressing head body 31 includes an upper pressing head body 311 and a lower pressing head body 312 that can be coaxially butted to form a through air guide channel and a liquid guide channel. Preferably, the upper pressing head body 311 is detachably connected to the robotic arm 2. Further preferably, a liquid flow channel 3111 and an air flow channel 3112 are arranged in parallel in the upper pressing head body 311. Preferably, the lower pressing head body 312 is detachably sleeved on the axial lower end of the upper pressing head body 311, and a diversion channel 3121 communicating the liquid flow channel 3111 and the air flow channel 3112 is arranged inside it. Further preferably, check valves are arranged at the output ports of the liquid flow channel 3111 and the air flow channel 3112 to limit the one-way output of the liquid flow and the air flow. Preferably, a pressing adapter 33 is connected to the bottom of the lower pressing head body 312 away from the upper pressing head body 311. Preferably, three mounting holes are circumferentially spaced on the side surface of the upper pressing head body 311, and a lever fixing bolt for positioning the mounting position of the position adjusting lever 323 is detachably mounted in the mounting holes, so that the position adjusting lever 323 is deflectably arranged on the outer side surface of the upper pressing head body 311 in a manner parallel to the tangent of the cross-section of the upper pressing head body 311. Preferably, three outer vertical grooves 3122 for accommodating at least part of the hooks 321 are circumferentially spaced on the outer side surface of the lower pressing head body 312. Preferably, a through vertical hole 3123 communicating with the cavity of the outer vertical groove 3122 and limiting the movement direction of the hook pull rod 322 is also arranged at the top of the outer vertical groove 3122. Preferably, a slope protrusion is arranged in the outer vertical groove 3122, so that a slope inclined surface is constructed on the groove bottom at the radially inner side of the outer vertical groove 3122, so that when the hook 321 moves downward, the hook 321 can deflect outward around the rotation connection center with the hook pull rod 322 under the limitation of the slope inclined surface, thereby realizing the opening of the hook 321 during the downward movement. Preferably, the slope inclined surface is a high-gloss surface facilitating the deflection and sliding of the hook 321, so that the hook 321 can be limited and guided by the inclined slope surface during the descending process, and the hook 321 is forced to deflect in an opening manner around the connection rotating shaft between it and the hook pull rod 322.

[0043] Specifically, when performing flow tests and pressure tests, the pipe body-type workpiece to be tested is usually brought into contact with the pressure head 3 through a high-precision limit mechanism 32, and then the liquid flow for flow testing is controllably delivered to the lumen to obtain the flow threshold range. After completing the flow test, it is necessary to empty the residual liquid in the lumen by continuously inputting gas, and then seal the excess openings of the tube body to ensure the accuracy and stability of the pressure test. During the pressure test, the pressure is controllably increased to test the stability of the tube body under different pressures and the pressure bearing capacity of the weld, and pressure maintenance verification is performed under different pressure gradients to achieve effective detection of the sealing of the weld. In addition, after the pipe body completes the conventional pressure test and pressure holding test, for special pipelines such as lubricating oil pipelines, the pipe body needs to be subjected to a high-temperature and high-pressure flow pressure test. That is, a pressure test is performed through a liquid flow with continuous flow and changing liquid pressure, and the liquid flow is heated to verify the liquid transportation capacity and stability of the pipe body under high temperature and high pressure conditions, thereby effectively simulating the state of pressurized aviation lubricants with a transportation temperature of 145° in the lubricating oil pipeline, thereby improving the test accuracy and effect.

[0044] Preferably, the high-precision limit mechanism 32 includes a hook 321, a hook pull rod 322, a position adjustment lever 323 and a limit pressure cover 324. Preferably, the top end of the hook 321 is rotatably connected to the hook pull rod 322, and the axial upper end of the hook pull rod 322 is hung on the position adjustment lever 323 through a hanging bearing body 3221 sleeved on the pin shaft, so that when the position adjustment lever 323 deflects, it can drive the hook pull rod 322 and the hook 321 to rise and fall synchronously, and then the hook 321 provides a tensioning force for the workpiece to be measured by abutting against the side of the workpiece to be measured and pulling the workpiece to be measured, so that the workpiece to be measured is pressurized and abutted against the pressing adapter 33. Preferably, the position adjustment lever 323 is rotatably installed on the outer surface of the upper body 311 of the pressing head. Further preferably, a limiting pressure cover 324 for driving the adjusting lever 323 to deflect is also sleeved on the upper body 311 of the pressing head, and the limiting pressure cover 324 is also threadedly sleeved on the lower body 312 of the pressing head, so as to locate its working position by adjusting its axial length sleeved on the lower body 312 of the pressing head, and then the limiting pressure cover 324 clamps the hook 321 by means of a clamp while driving the adjusting lever 323 to deflect, so that the hook 321 clamps the workpiece to be measured.

[0045] Preferably, a plurality of hooks 321 are arranged in an annularly spaced manner in the outer vertical slot 3122 of the pressing head lower body 312. Further preferably, the hook pull rod 322 is inserted and installed in a vertical through hole 3123 connected to the outer vertical slot 3122 in a liftable manner. Preferably, an outer thread 3124 matching the inner thread 3242 on the inner wall surface of the limit pressure cover 324 is processed on the upper outer wall of the pressing head lower body 312.

[0046] Preferably, an anti-slip abutting block 3212 capable of abutting against the outer wall surface of the workpiece to be measured is provided at the lower axial end of the arc-shaped rod body 3211 of the hook 321. Further preferably, a rotating connection pin shaft capable of being rotatably inserted on the hook pull rod 322 and a first installation groove for installing the rotating connection pin shaft are provided at the upper axial end of the arc-shaped rod body 3211.

[0047] Preferably, a second installation groove is provided at the top end of the hook pull rod 322, and a pin shaft is horizontally inserted in the second installation groove. Specifically, a hanging bearing body 3221 is sleeved on the pin shaft. The hanging bearing body 3221 can be hung on the semi-circular groove 3234 of the inclined main rod 3231.

[0048] As Figure 3 and Figure 7 shown, an outwardly inclined shaft rod 3232 is connected to the upper inclined end of the inclined main rod 3231 of the position adjusting lever 323. Further preferably, a rolling contact bearing body 3233 capable of rolling and abutting against the inner top surface of the limit pressing cover 324 is sleeved on the outwardly inclined shaft rod 3232. Preferably, a positioning hole for inserting a lever fixing bolt is provided in the middle section of the inclined main rod 3231, so that it can be pivotally installed on the side surface of the upper body 311 of the pressing head through the lever fixing bolt. Preferably, a semi-circular groove 3234 with an upward opening is further provided at the lower inclined end of the inclined main rod 3231, so that the hanging bearing body 3221 at the upper axial end of the hook pull rod 322 is hung in the semi-circular groove 3234 in a manner that can rotate around the axis and the abutting support point changes adaptively, so that the hook pull rod 322 can be lifted when the inclined main rod 3231 deflects. Preferably, when the inclined main rod 3231 deflects, the hanging bearing body 3221 can drive, so that the hook pull rod 322 moves up and down. Among them, the hanging bearing body 3221 will generate relative rotation around its own axis, so that the surface area of the hanging bearing body 3221 in contact with the arc surface of the groove cavity of the semi-circular groove 3234 changes, so that the driving force application point of the hanging bearing body 3221 changes, and further effectively compensates for the micro displacement in the horizontal direction, realizing that the small stroke deflection transmission of the large force arm formed by the inclined main rod 3231 in the inclined posture can be approximated as a lifting and pulling movement. Due to the adaptive rotation of the hanging bearing body 3221 and the change of the force-bearing support point, the micro displacement can be converted into the rolling of the hanging bearing body 3221 in the semi-circular groove 3234.

[0049] Preferably, a reset torsion spring capable of limiting the initial inclination of the tilting main rod 3231 is also sleeved on the lever fixing bolt. Specifically, the tilting main rod 3231 is rotatably sleeved on the lever fixing bolt, so that the lever fixing bolt positions the deflection center of the tilting main rod 3231 as a deflection force arm. When the limit pressure cover 324 rises to the highest position and does not limit the tilting main rod 3231, the reset torsion spring can force the tilting main rod 3231 to reset and deflect, so that the tilting lower end of the tilting main rod 3231 is located at the lowest position. At this time, the limit pressure cover 324 does not clamp and limit the hook 321 at all. The hook 321 moves downward synchronously with the descending of the inclined lower end of the inclined main rod 3231. Since the hook 321 is not limited by the limited pressure cover 324, and under the limited guidance of the inclined groove wall of the outer vertical groove 3122, the downwardly moved hook 321 will be opened by the slope plane formed by the inclined groove wall of the outer vertical groove 3122, so that the opened hook 321 is convenient for secondary assembly of the workpiece, or when the pressure adapter 33 is directly docked with the large-size sealed bearing seat clamped by the automatic pressure-balancing clamping assembly 5, the outwardly inclined hook 321 will not affect the automatic docking of the pressure adapter 33 and the automatic pressure-balancing clamping assembly 5 to produce structural obstacles, and effectively expose the pressure adapter 33. Specifically, the angle formed by the hook 321 can be greater than or equal to 120°.

[0050] like Figure 8As shown in the figure, a through hole 3241 for movably inserting and mounting the upper body 311 of the pressure head is provided at the top of the limit gland 324. Thus, the limit gland 324 moves axially in a manner of being movably sleeved on the upper body 311 of the pressure head, and a radial inner ring plate body that abuts against the rolling contact bearing body 3233 is formed at the top of the ring shell body of the limit gland 324. Preferably, an internal thread 3242 is further provided on the inner wall surface of the limit gland 324, which can cooperate with the external thread 3124 on the inner wall surface of the limit gland 324 to achieve threaded socket connection between the limit gland 324 and the lower body 312 of the pressure head. Preferably, an anti-damage limit step 3243 is further provided on the inner bottom side of the limit gland 324. Specifically, the anti-damage limit step 3243 is an inner inclined ring surface provided at the lower edge of the limit gland 324, and the slope of the inner inclined ring surface coincides with the outer arc surface of the hook 321. When the limit gland 324 descends, the inner inclined ring surface formed by the anti-damage limit step 3243 can abut against the outer side surface of the hook 321, thereby effectively clamping the hook 321 in a manner of hoop limit, so that the hook 321 is limited in the outer vertical groove 3122, forcing the hook 321 to stably clamp the workpiece to be measured. By providing the anti-damage limit step 3243 in this application, the abutting area surface between the hook 321 and the limit gland 324 is effectively limited, avoiding contact between the hook 321 and the internal thread 3242, preventing the hook 321 from damaging the thread, and the anti-damage limit step 3243 can increase the contact area with the hook 321, improving the stability of the hoop limit, so that the clamped hook 321 can stably clamp the workpiece to be measured.

[0051] Preferably, the pressure conversion joint 33 includes a large-diameter joint 331 and a small-diameter joint 332. The small-diameter joint 332 is detachably threadedly connected to the lower end of the large-diameter joint 331 in the axial direction. A small-diameter conical outer inclined surface adapted to a tubular workpiece with an inner pipe diameter of 1 mm - 25 mm and having an inner conical surface is provided at the lower end of the small-diameter joint 332. Further preferably, a small-diameter conical inner inclined surface that is inserted into the large-diameter joint 331 and abuts against the large-diameter conical inner inclined surface of the large-diameter joint 331 is further provided at the upper end of the small-diameter joint 332. Specifically, the small-diameter conical inner inclined surface can be adapted to a tubular workpiece with an outer pipe diameter of 1 mm - 25 mm and having an outer conical surface. Specifically, external threads with equal ring surface diameters and tooth diameters are provided on the outer wall of the upper section of the large-diameter joint 331 and the outer wall of the lower section of the small-diameter joint 332, so that the large-diameter joint 331 can be selectively docked with the lower body 312 of the pressure head or the small-diameter joint 332 can be docked with the lower body 312 of the pressure head, thereby realizing the forward installation or reverse installation of the pressure conversion joint 33, and facilitating the adaptation to the workpiece to be measured with a conical outer inclined surface or the workpiece to be measured with a conical inner inclined surface.

[0052] Preferably, a large-diameter conical outer inclined surface adapted to a tubular workpiece with an inner pipe diameter of 25 mm - 40 mm and having an inner conical surface is provided at the lower end of the large-diameter joint 331.

[0053] Preferably, the upper end of the large-diameter joint 331 is provided with a large-diameter conical inner inclined surface adapted to a tubular workpiece having an outer diameter of 25 mm-40 mm and an outer conical surface.

[0054] Specifically, when the punching adapter 33 is properly installed, the small-diameter connector 332 is inserted into the lower end of the large-diameter connector 331, so that it is used to dock with a tubular workpiece with an inner diameter of 1mm-25mm and an inner conical surface; when the punching adapter 33 is properly installed, the small-diameter connector 332 is removed so that the single large-diameter connector 331 can be used to dock with a tubular workpiece with an inner diameter of 25mm-40mm and an inner conical surface.

[0055] Specifically, when a tubular workpiece with an outer cone surface needs to be tested, the small-diameter connector 332 is threadedly inserted into the lower body 312 of the pressing head, so as to be connected with the tubular workpiece with an outer diameter of 1 mm-40 mm and an outer cone surface.

[0056] Preferably, the pressure head 3 can be connected to an external oil and gas supply system through a constant pressure delivery assembly 4, so that gas pressure, liquid pressure or flow test can be selectively performed. Figure 9 As shown, the constant pressure delivery assembly 4 includes an outer shell 41, a flow guide tube 42, a variable volume pressure regulating chamber shell 43, an expansion buffer chamber shell 44, an inlet pipe 45 and an outlet pipe 46. Preferably, a flow guide tube 42 is provided in the outer shell 41. Preferably, a variable volume pressure regulating chamber shell 43 and an expansion buffer chamber shell 44 are inserted in parallel on the side of the flow guide tube 42. Further preferably, the air-filled chamber of the variable volume pressure regulating chamber shell 43 and the air-filled chamber of the expansion buffer chamber shell 44 are isobarically connected, so that when the fluid fluctuates, the increased fluid pressure compresses the volume of the sealed air-filled chamber of the variable volume pressure regulating chamber shell 43, so that the gas is compressed, the gas pressure increases, and the expansion deformation strength of the expansion buffer chamber shell 44 increases, so that the expansion buffer chamber shell 44 buffers the fluid fluctuation more effectively. Preferably, the side of the flow guide tube 42 is also inserted with an inlet pipe 45 arranged in opposition to the variable volume pressure regulating chamber shell 43. Further preferably, an outlet pipe 46 is also inserted at one end of the expansion buffer chamber shell 44 away from the guide cavity tube 42. Preferably, the input end of the inlet pipe 45 is connected to an external oil and air supply system. Preferably, the output end of the outlet pipe 46 can be connected to the liquid flow channel 3111 or the air flow channel 3112 of the pressure head 3. The variable volume pressure regulating chamber shell 43 and the expansion buffer chamber shell 44 provided in the present application can be linked when fluctuations occur during fluid flow, thereby effectively reducing the flow shock caused by fluctuations in the input fluid, effectively reducing the maximum abutment strength and sealing pressure required for docking limit, and can also ensure the stability and sealing retention ability of the docking, reduce the maximum clamping threshold of the stable limit, reduce the fluctuation shock, and enhance the shape retention effect of the low threshold clamping.

[0057] In this application, the variable volume pressure regulating chamber housing 43 and the inlet flow pipe 45 are arranged in alignment, so that the inlet flow pipe 45 can more accurately and timely cause the volume change of the inflatable chamber according to the fluctuation of the flow rate input by the inlet flow pipe 45. Furthermore, the buffering effect of the expansion deformation of the expansion buffer chamber housing 44 on the flow rate fluctuation is improved through the coordinated linkage between the variable volume pressure regulating chamber housing 43 and the expansion buffer chamber housing 44.

[0058] Preferably, the variable volume pressure regulating chamber housing 43 includes a first chamber pipe 431, a piston body 432, a piston rod 433 and a linkage cross bar 434. Preferably, the piston body 432 is inserted into the first chamber pipe 431, so as to form an inflatable chamber in the first chamber pipe 431 that is not communicated with the diversion chamber pipe 42. Further preferably, the surface of the piston body 432 away from the diversion chamber pipe 42 is connected with a piston rod 433 that penetrates the top cover of the first chamber pipe 431. One end of the piston rod 433 outside the first chamber pipe 431 is connected with a linkage cross bar 434.

[0059] Preferably, the expansion buffer chamber housing 44 includes a second chamber tube 441, an elastic expansion ring piece 442, a ring body inflation attachment chamber 443, a wrapping ring sleeve 444, a linkage rod 445, and a connecting air pipe 446. Preferably, the second chamber tube 441 is inserted into the diversion chamber tube 42. An elastic expansion ring piece 442 capable of expanding and deforming with the change of the pressure of the fluid in the tube cavity is provided on the tube body of the second chamber tube 441, and a ring body inflation attachment chamber 443 covering the elastic expansion ring piece 442 is also sleeved outside the second chamber tube 441. Preferably, a wrapping ring sleeve 444 for limiting the area where the elastic expansion ring piece 442 can deform is also sleeved on the second chamber tube 441. Specifically, the wrapping ring sleeve 444 can axially translate with the change of the fluid pressure, so as to expose different areas of the elastic expansion ring piece 442 under different fluid pressure conditions, enabling the elastic expansion ring piece 442 to adaptively buffer the impact force generated by the fluid fluctuation, reducing the impact force of the fluid output by the second chamber tube 441, and thus improving the smoothness of the input flow rate of the pressure test. Preferably, the wrapping ring sleeve 444 is also connected to a linkage rod 445 passing through the ring body inflation attachment chamber 443. Further preferably, one end of the linkage rod 445 located outside the ring body inflation attachment chamber 443 is connected to a linkage cross bar 434, so that the wrapping ring sleeve 444 can synchronously translate horizontally with the piston body 432, thereby changing the actual deformable area of the elastic expansion ring piece 442, and further effectively buffering the impact force generated by different magnitudes of flow rate fluctuations adaptively. Preferably, the ring body inflation attachment chamber 443 is connected to the inflation chamber of the first chamber tube 431 through the connecting air pipe 446 to ensure the air pressure balance in the inner cavities of the two. Preferably, a guiding slide bar 447 arranged opposite to the linkage rod 445 is also provided at the end of the wrapping ring sleeve 444. Further preferably, the guiding slide bar 447 is guided by passing through the end wall of the ring body inflation attachment chamber 443. Preferably, an inflation port 448 is also installed on the end wall of the ring body inflation attachment chamber 443.

[0060] As Figure 10 and Figure 11As shown, the automatic constant-pressure clamping assembly 5 includes a circular support frame base 51, a stepper motor 52, a slider-pushing rotating force arm 53, a sliding connecting rod 54, a slider 55, a linear guide rail 56, a fixture head 57, and a fixture head center fixing frame 58. Preferably, the circular support frame base 51 is embedded in the operation table 1. A upper groove cavity is centrally opened at the bottom of the circular support frame base 51. The stepper motor 52 is installed in the upper groove cavity through fixing screws, and a slider-pushing rotating force arm 53 located in the installation cavity of the circular support frame base 51 is connected to the top end of the transmission shaft of the stepper motor 52. Preferably, the slider-pushing rotating force arm 53 is a cross-shaped structure, and a sliding connecting rod 54 is hinged to the radial distal end of the slider-pushing rotating force arm 53 away from the stepper motor 52. Preferably, four linear guide rails 56 are circumferentially and spacedly arranged on the top surface of the circular support frame base 51. Further preferably, the slider 55 is slidably connected to the linear guide rail 56, so as to define the movement direction of the slider 55 through the linear guide rail 56. Further preferably, the slider 55 is also hinged to the sliding connecting rod 54, so that the sliding connecting rod 54 can drive the slider 55 to perform a directional translation on the linear guide rail 56. Specifically, the slider-pushing rotating force arm 53 drives the four sliding connecting rods 54 to move simultaneously under the drive of the stepper motor 52, so as to drive the four sliders 55 to move centripetally or centrifugally. Furthermore, when the four sliders 55 perform synchronous centripetal translation, the fixture head 57 connected to the four sliders 55 can clamp large-sized workpieces to be measured, such as a sealed bearing seat, in a manner of alignment clamping. Preferably, the fixture head center fixing frame 58 is arranged above the slider-pushing rotating force arm 53 in a manner of being connected to the four linear guide rails 56 at the same time. Preferably, the stepper motor 52 is a servo motor capable of setting the motor drive torque magnitude. The purpose of driving through the stepper motor 52 in this application is to ensure that it can perform a quantitative deflection and positioning according to requirements. In particular, it can perform a controllable quantitative deflection according to the preset clamping pressure, so as to clamp different specifications of sealed bearing seats with a fixed equal force, thereby effectively ensuring the clamping stability and the shape protection ability. Since the sealed bearing seat has relatively high assembly precision requirements, its shape integrity needs to be ensured during clamping. However, the existing clamping structures are extremely likely to cause shape damage or deformation during clamping. Therefore, it is necessary to set the clamping pressure. In this application, the magnitude threshold of the clamping force of the workpiece is set according to the basic data and material characteristics of the workpiece collected in advance. Thus, the servo motor limits its working deflection mechanism through the preset torque threshold. Furthermore, the servo motor deflects under the drive of the control module and stops working when its deflection torque reaches the set value. At this time, the fixture clamps the workpiece without damage through the preset clamping force. Preferably, the automatic constant-pressure clamping assembly 5 is mainly used for the clamping and positioning of bearing seals with a diameter of φ20mm - φ280mm. When the workpiece size exceeds this range, magnetic adsorption limit positioning is directly performed through the electromagnet chuck on the operation table 1.

[0061] The present application also provides a pressure test method for a pressure test bench without tooling, and this method is designed based on the test bench in the foregoing content.

[0062] When the workpiece to be tested is a tubular part:

[0063] The pressure conversion joint 33 is adaptively assembled to the pressure head main body 31 according to the interface form of the workpiece to be tested, and the port of the workpiece to be tested is docked with the pressure conversion joint 33.

[0064] The limit gland 324 is screwed, so that the descending limit gland 324 pushes the adjustment lever 323 to deflect, and thus the hook pull rod 322 and the hook 321 are pulled up under the traction of the adjustment lever 323, and multiple hooks 321 cooperate to tightly hold the workpiece to be tested under the limit of the limit gland 324, so that the workpiece to be tested is pressed against the pressure conversion joint 33, thereby realizing the pressure sealing abutment that can protect the shape of the tubular workpiece to be tested.

[0065] When the workpiece to be tested is a large part such as a sealed bearing seat:

[0066] The sealed bearing seat is placed on the fixture head center fixing frame 58, and then the stepping motor 52 drives the slider to push the rotating force arm 53 to deflect, thereby driving the sliding connecting rod 54 to move, and further the sliding connecting rod 54 pulls the slider 55 to perform a directional translation on the linear guide rail 56, so that the fixture heads 57 on the four sliders 55 cooperate to clamp the workpiece to be tested.

[0067] The limit gland 324 is screwed, so that the limit gland 324 moves upward, and thus the hook 321 descends through a linkage manner, and the hook 321 is gradually expanded during the descending process, so that the pressure conversion joint 33 is fully exposed to eliminate structural interference.

[0068] The mechanical arm 2 is used to adjust the working position of the pressure head 3, so that the pressure conversion joint 33 of the pressure head 3 abuts against the port of the bearing seal seat, thereby realizing the limit sealing abutment between the workpiece and the test equipment.

[0069] The present invention is not limited to the above optional embodiments, and anyone can obtain other various forms of products under the inspiration of the present invention. However, no matter what changes are made in its shape or structure, as long as the technical solutions fall within the scope defined by the claims of the present invention, they all fall within the protection scope of the present invention. Those skilled in the art should understand that the description and drawings of the present invention are illustrative and do not constitute a limitation to the claims. The protection scope of the present invention is defined by the claims and their equivalents. Throughout the text, the features guided by "preferably" are only an optional manner and should not be understood as being necessarily set. Therefore, the applicant reserves the right to abandon or delete the relevant preferred features at any time.

Claims

1. A tooling-free pressure test bench, comprising an operating table (1) and a mechanical arm (2) supported on the operating table (1), characterized in that: One end of the mechanical arm (2) away from the operating table (1) is connected to a pressing head (3) suspended above the operating table (1), wherein the pressing head (3) can adjust its suspension point and posture through the mechanical arm (2) so that it can adaptably contact with the workpiece to be tested placed on the operating table (1); A high-precision limit mechanism (32) capable of limiting the docking state between the pressing head body (31) and the workpiece to be measured is also provided on the pressing head body (31) of the pressing head (3), and a pressing adapter (33) is detachably connected to the axial lower end of the pressing head body (31), wherein the high-precision limit mechanism (32) applies pressure to the workpiece to be measured while adaptively clamping the workpiece to be measured and abutting against the pressing adapter (33); The pressing head body (31) comprises a pressing head upper body (311) and a pressing head lower body (312) which are coaxially connected to form a through-flow channel and a through-flow channel. The pressing head upper body (311) is detachably connected to the mechanical arm (2), and a liquid flow channel (3111) and an air flow channel (3112) are provided in parallel in the pressing head upper body (311). The pressing head lower body (312) is detachably mounted on the axial lower end of the pressing head upper body (311), and a flow channel (3121) is provided in the pressing head lower body to connect the liquid flow channel (3111) and the air flow channel (3112). The high-precision limiting mechanism (32) comprises a hook (321), a hook pull rod (322), a position adjustment lever (323) and a position limiting pressure cover (324); the top end of the hook (321) is rotatably connected to the hook pull rod (322); the axial upper end of the hook pull rod (322) is hooked on the position adjustment lever (323); so that when the position adjustment lever (323) is deflected, it can drive the hook pull rod (322) and the hook (321) to rise and fall synchronously; the position adjustment lever (323) is rotatably mounted on the outer surface of the upper body (311) of the pressing head; the upper body (311) of the pressing head is also sleeved with the position limiting pressure cover (324) for driving the position adjustment lever (323) to be deflected; and the position limiting pressure cover (324) is also threadedly sleeved on the lower body (312) of the pressing head.

2. The tooling-free pressure test bench according to claim 1, characterized in that: The bottom of the pressing head lower body (312) is connected to the pressing adapter (33) which can be selectively installed upright or inverted.

3. The tooling-free pressure test bench according to claim 2, characterized in that: A plurality of the hooks (321) are arranged in an annularly spaced manner in an outer vertical slot (3122) of the pressing head lower body (312), and the hook pull rod (322) is inserted and installed in a vertical through hole (3123) connected to the outer vertical slot (3122) in a liftable manner.

4. The tooling-free pressure test bench according to claim 3, characterized in that: The inclined upper end of the inclined main rod (3231) of the position adjustment lever (323) is connected to a camber shaft rod (3232), and a rolling bearing body (3233) capable of rolling against the position limiting pressure cover (324) is sleeved on the camber shaft rod (3232).

5. The tooling-free pressure test bench according to claim 4, characterized in that: The inclined lower end of the inclined main rod (3231) is also provided with a semi-lunar groove (3234) opening upward, so that the axial upper end of the hook pull rod (322) is hung in the semi-lunar groove (3234) through the hanging bearing body (3221).

6. The tooling-free pressure test bench according to claim 5, characterized in that: A through opening (3241) for inserting the pressing head body (311) is formed on the top of the limiting pressing cover (324); An internal thread (3242) is provided on the inner wall surface of the limiting gland (324); and an anti-damage limiting step (3243) capable of clamping and limiting the hook (321) is also provided on the inner bottom side of the limiting gland (324).

7. The tooling-free pressure test bench according to claim 6, characterized in that: A constant pressure delivery component (4) capable of adaptively buffering fluctuations of the input fluid is connected to the input end of the pressure head (3), wherein: A flow guide cavity tube (42) is provided in the housing (41) of the constant pressure delivery component (4). A variable volume pressure regulating chamber shell (43) and an expansion buffer chamber shell (44) are inserted in parallel on the side of the guide chamber tube (42), and the variable volume pressure regulating chamber shell (43) is in isobaric communication with the expansion buffer chamber shell (44); An inlet pipe (45) arranged in alignment with the variable capacity pressure regulating chamber shell (43) is also inserted on the side of the flow guiding chamber tube (42), and an outlet pipe (46) is also inserted at one end of the expansion buffer chamber shell (44) away from the flow guiding chamber tube (42).

8. The tooling-free pressure test bench according to claim 7, characterized in that: An automatic pressure-balancing clamping assembly (5) for selectively clamping the workpiece to be measured is also provided on the operating table (1). The circular support frame base (51) of the automatic pressure-balancing clamping assembly (5) is embedded in the operating table (1). A stepper motor (52) is installed at the bottom of the circular support frame base (51) for driving a slider (55) to translate in a linear guide rail (56) by pushing a rotating force arm (53) and a sliding connecting rod (54) through a slider, so that the clamp heads (57) on the plurality of sliders (55) cooperate to clamp the workpiece to be measured, wherein four linear guide rails (56) are embedded on the top surface of the circular support frame base (51) in a manner of annularly spaced arrangement.

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