Tool-free pressing test bench

Abstract

The invention relates to a tool-free pressing test bench, and relates to the technical field of aviation accessory pressing test equipment, the tool-free pressing test bench comprises an operation table and a mechanical arm supported on the operation table, and one end, far away from the operation table, of the mechanical arm is connected with a pressing head suspended above the operation table; the suspension point position and posture of the pressing head can be adjusted through the mechanical arm so that the pressing head can be in butt joint with a to-be-tested workpiece arranged on the operation table in a matched mode. A pressing head body of the pressing head is further provided with a high-precision limiting mechanism for limiting the butt joint state of the pressing head body and a workpiece to be detected, and the axial lower end of the pressing head body is detachably connected with a pressing adapter. The high-precision limiting mechanism adaptively clamps the to-be-tested workpiece and presses the to-be-tested workpiece against the pressing adapter at the same time. According to the invention, lossless clamping and butt-joint limiting can be effectively carried out on the to-be-tested workpiece, so that the stability of pressing tight connection and the test accuracy are ensured.

Description

Technical Field

[0001] The invention relates to the technical field of pressure test equipment for aviation parts, and in particular to a tooling-free pressure test bench. Background Art

[0002] When producing aircraft engines, it is necessary to manufacture a number of oil pipelines for conveying lubricating oil and cooling pipelines for conveying cooling media, as well as bearing seal seats, when developing and producing the sealing components of aircraft engines. In order to make the pipelines compatible with 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, so it is necessary to weld and assemble the multiple sections of pipe bodies. Since the production and manufacturing of aircraft engines has extremely high standards, the processing and manufacturing of supporting equipment and pipeline accessories and bearing seal seats related to aircraft engines also need to meet higher standards. Therefore, it is necessary to perform pressure tests on welded pipe bodies and other accessories to ensure the quality of welding, and it is also necessary to perform pressure tests on accessories such as bearing seal seats to ensure the sealing of the structure, that is, it is necessary to perform pressure tests on multiple oil circuits and gas circuits that make up the sealing components of the aircraft engine.

[0003] However, when conducting pressure tests on existing pipelines and bearing seals, the pressure test equipment needs to be specially designed with special docking and plugging tools according to the product shape and structure, resulting in high test costs, long pressure test cycles, high overall process complexity, and the need to consume a lot of manpower and financial resources. In particular, the openings of products such as pipelines and bearing seals usually do not have threaded, buckled, or other limiting connection structures that are convenient for connecting to the pressure heads of conventional pressure test equipment, resulting in difficulty in assembly and docking, and it is difficult to ensure the stability and tightness of the pressure 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 parts are usually singular, there are no extra redundant test pieces, and each part needs to be tested, so that aviation parts need to be directly assembled and used after passing the pressure test. Traditional clamping methods usually need to apply a clamping force far greater than the limit threshold to the workpiece to ensure the stability of the assembly connection. Excessive clamping force can easily leave scratches on the workpiece or cause the workpiece to be squeezed and deformed. The damaging welding positioning solution cannot meet the pressure test requirements of aviation parts because it cannot retain the workpiece intact. Finally, the existing grasping clamping structure cannot effectively connect the above-mentioned aviation parts with traditional pressure test equipment, and cannot ensure the stability of the pressure assembly and the pressure-maintaining tightness 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. Fluctuations in hydraulic or air pressure can easily affect the stability and airtightness of the docking, increasing the difficulty of maintaining the docking posture without loss. Summary of the invention

[0004] The purpose of the present invention is to provide a tooling-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 the pressure seal and the test accuracy. The present invention solves the problem that the existing conventional pressure test equipment cannot effectively clamp and dock workpieces such as special-shaped welded assembled pipes and bearing seats related to aircraft engines that do not have limiting connection structures such as threads and snaps, and cannot ensure the stability and close contact of the pressure test assembly, resulting in poor accuracy of the test data. It is also very easy to over-clamp, thereby causing deformation and damage of the workpiece.

[0005] The technical solution adopted by the present invention is: a tooling-free pressure test bench, including an operating table and a mechanical arm supported on the operating table, wherein the end of the mechanical arm away from the operating table is connected to a pressure head suspended above the operating table, wherein the pressure head can adjust its suspension point and posture through the mechanical arm, so that it can adaptably connect with the workpiece to be tested placed on the operating table; a high-precision limit mechanism capable of limiting 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, and a pressure adapter is detachably connected to the axial lower end of the pressure head body, wherein the high-precision limit mechanism can pressurize the workpiece to be tested against the pressure adapter while adaptively clamping the workpiece to be tested. The advantage is that the high-precision limit mechanism provided in the present application can adaptively clamp the workpiece to be tested and pull the workpiece to be tested, so that the workpiece to be tested is non-destructively pressurized against the pressure adapter. The high-precision limit mechanism can adaptively clamp tubular workpieces within a certain size range, and it can also pull and position the workpiece while clamping and limiting, so that the clamped workpiece can stably abut against the pressure adapter while ensuring the connection seal, improving the accuracy of subsequent tests. In addition, the high-precision limit mechanism can protect the outer contour of the clamped workpiece through the mutual restraint of the clamping force and the pulling and abutting force, avoid scratches or deformation on the workpiece surface, and improve the safety of the test limit and the non-destructive positioning capability.

[0006] According to a preferred embodiment, the pressing head body includes a pressing head upper body and a pressing head lower body that can be coaxially docked and form a through-flow channel and a liquid channel, wherein the pressing head upper body is detachably connected to the mechanical arm, and a liquid flow channel and an air flow channel are opened in parallel in the pressing head upper body; the pressing head lower body is detachably mounted on the axial lower end of the pressing head upper body, and a flow channel connecting the liquid flow channel and the air flow channel is opened inside it, and the bottom of the pressing head lower body is connected to the pressing adapter that can be selectively installed upright or inverted. Its advantage is that the pressing head upper body can be connected to the air circuit or the oil circuit according to the needs, so that the flow test and the pressure test of the workpiece to be tested can be selectively performed, realizing the integrated multi-purpose of the pressing head body, reducing the number of disassembly and assembly, and the workpiece to be tested can complete a variety of different tests at a single clamping station, improving the efficiency of detection, and avoiding the need for the workpiece to be tested to undergo multiple tests through frequent disassembly and assembly, thereby causing the risk of appearance damage. In addition, the pressure adapter can be installed upright or inverted according to the opening contour of the workpiece to be tested, improving the adaptability and sealing of the docking.

[0007] According to a preferred embodiment, the high-precision limit mechanism includes a hook, a hook pull rod, a position adjustment lever and a position limit pressure cover, wherein 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 hooked on the position adjustment lever, so that when the position adjustment lever is deflected, it can drive the hook pull rod and the hook to rise and fall synchronously; the position adjustment lever is deflectably installed on the outer surface of the upper body of the pressing head, and the position limit pressure cover that drives the position adjustment lever to deflect is also sleeved on the upper body of the pressing head, and the position limit pressure cover is also threadedly sleeved on the lower body of the pressing head. Its advantage is that the position limit pressure cover provided in the present application drives the position adjustment lever to deflect slightly by screwing, so that the position adjustment lever can drive the hook pull rod and the hook to rise and fall, and the hook is also synchronously clamped and limited by the position limit pressure cover, so that the hook clamps the workpiece to be measured and pulls the workpiece to be measured to move axially, ensuring the stability of the pressurized close contact of the workpiece to be measured and the pressure-maintaining close contact strength.

[0008] According to a preferred embodiment, a plurality of the hooks are arranged in an annularly spaced manner in the outer vertical slot of the lower body of the pressing head, and the hook pull rod is inserted and installed in a vertical hole connected to the outer vertical slot in a liftable manner. The advantage is that an inclined slope surface is provided in the outer vertical slot, so that the descending hook can be limited to present an outward support and unfolded posture.

[0009] According to a preferred embodiment, a camber shaft rod is connected to the inclined upper end of the inclined main rod of the position adjustment lever, and a rolling bearing body capable of rolling against the limiting pressure cover is sleeved on the camber 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: 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; 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.

[0015] The beneficial effects of the present invention are: The pressure head provided in the present application can adaptively clamp, position and limit the workpiece to be tested, and realize effective clamping and docking and limiting of various workpieces without positioning structural features, improve the scope of application and test accuracy, and effectively maintain the shape of the workpiece to be tested while ensuring the sealed docking between the workpiece to be tested and the pressure adapter, avoiding deformation and damage to the workpiece caused by excessive limiting clamping force, improving the shape protection ability, and improving the close connection stability. The high-precision limiting mechanism provided in the present application can adaptively clamp the workpiece to be tested while also pulling the workpiece to be tested, so that the workpiece to be tested can be non-destructively pressurized and abutted against the pressure adapter. The high-precision limiting mechanism can adaptively clamp tubular workpieces to be tested within a certain size range, and it can realize the pulling and positioning of the workpiece to be tested while clamping and limiting, so that the clamped workpiece to be tested can stably abut against the pressure adapter while ensuring the sealing of the connection, thereby 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 restraint of the clamping force and the pulling and contacting force, and avoid scratches or deformation of the workpiece surface. The upper body of the pressure head set in this application can be connected to the air circuit or oil circuit according to the needs, so that the flow test and pressure test of the workpiece to be tested can be selectively performed, realizing the integrated multi-purpose of the pressure head body, reducing the number of disassembly and assembly times, and the workpiece to be tested can complete a variety of different tests in a single clamping station, improving the efficiency of detection and reducing the risk of damage to the workpiece to be tested.

[0016] The constant pressure delivery component provided in the present application can effectively buffer the flow fluctuations generated when the pressurized fluid is input, effectively reduce the fluid impact caused by the flow fluctuations, and improve the stability of the fluid pressure, thereby effectively reducing the maximum threshold of the limiting force, improving the stability and effect of the sealed docking, and reducing the difficulty of maintaining the docking posture without loss.

[0017] The automatic pressure-balancing clamping assembly provided in the present application can effectively limit the clamping of large-sized workpieces such as sealed bearing seats, and it ensures the constancy of the clamping force through a servo motor with set torque size to avoid excessive clamping and damage to the workpiece. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of a preferred tooling-free pressure test bench proposed by the present invention; Figure 2 It is a structural schematic diagram of a preferred pressure head of a tooling-free pressure test bench proposed by the present invention; Figure 3 It is a plan view of a preferred pressure head of a tool-free pressure test bench proposed by the present invention at the position adjustment lever; Figure 4 It is a schematic diagram of the assembly of a preferred pressure head of a tooling-free pressure test bench proposed by the present invention; Figure 5 It is a schematic diagram of the assembly of a preferred pressure head of a tooling-free pressure test bench proposed by the present invention when the hook is opened; Figure 6 It is a structural schematic diagram of a preferred pressure head main body of a tooling-free pressure test bench proposed by the present invention; Figure 7 It is a top view of a preferred adjustment lever of a tooling-free pressure test bench proposed by the present invention; Figure 8 It is a schematic axial cross-sectional view of a preferred limiting gland of a tooling-free pressure test bench proposed by the present invention; Fig. 9 It is a structural schematic diagram of a constant pressure conveying component of a preferred tooling-free pressure test bench proposed by the present invention; Fig.10 It is a structural schematic diagram of an automatic pressure-balancing clamping assembly of a preferred tooling-free pressure test bench proposed by the present invention; Fig.11 It is a structural schematic diagram of an automatic pressure-balancing clamping assembly of a preferred tooling-free pressure test bench proposed by the present invention when the clamping spacing is reduced.

[0019] Reference numerals list 1: operating table; 2: mechanical arm; 3: pressure head; 4: constant pressure conveying assembly; 5: automatic pressure balance clamping assembly; 31: pressure head body; 32: high-precision limit mechanism; 33: pressure adapter; 311: pressure head upper body; 312: pressure head lower body; 3111: liquid flow channel; 3112: air flow channel; 3121: diversion channel; 3122: external vertical groove; 3123: vertical through hole; 3124: external thread; 321: hook; 322: hook pull rod; 323: adjustment lever; 324: limit pressure cover; 3211: arc rod body; 3212: anti-slip abutment block; 3221: mounting bearing body; 3231: tilting main rod; 3232: camber shaft rod; 3233: rolling bearing body; 3234: half-moon groove; 3241: through-hole; 3242 : Internal thread; 3243: Anti-damage limit step; 331: Large diameter joint; 332: Small diameter joint; 41: Shell; 42: Guide cavity tube; 43: Variable volume pressure regulating cavity shell; 44: Expansion buffer cavity shell; 45: Inlet pipe; 46: Outlet pipe; 431: First cavity tube; 432: Piston body; 433: Piston rod; 434: Linkage cross bar; 441: Second cavity tube; 442: Elastic expansion ring piece; 443: Ring body inflation cavity; 444: Wrapping ring sleeve; 445: Linkage rod; 446: Connecting air pipe; 447: Guide slide rod; 448: Inflating port; 51: Circular support frame base; 52: Stepper motor; 53: Slider pushes the rotating force arm; 54: Sliding connecting rod; 55: Slider; 56: Linear guide rail; 57: Clamp head; 58: Clamp head center fixing frame. DETAILED DESCRIPTION

[0020] The following is a detailed description with reference to the accompanying drawings.

[0021] The present application provides a tooling-free pressure testing platform, which includes an operating platform 1, a mechanical arm 2, a pressure head 3, a constant pressure conveying component 4 and an automatic constant pressure clamping component 5.

[0022] according to Figures 1 to 11A specific embodiment is shown, in which a control system and an operating system are integrated on the operating table 1, so that data can be collected, stored and displayed according to needs, and it is also convenient for users to set equipment parameters and select different working modes according to needs. A mechanical arm 2 that can move in multiple directions above the table body and position the working end at different spatial coordinate points is also connected to the back side of the operating table 1. A pressure head 3 suspended above the operating table 1 is connected to the end of the mechanical arm 2 away from the operating table 1. The pressure head 3 can adjust its suspension point and posture through the mechanical arm 2, so that it can adaptably connect with the workpiece to be tested placed on the operating table 1. A constant pressure delivery component 4 that can adaptively release the fluctuation of the input fluid is connected to the input end of the pressure head 3. An automatic pressure-balancing clamping component 5 that can selectively clamp large-sized workpieces to be tested such as bearing seal seats to maintain their external shape is also provided on the operating table 1. The pressure head 3 provided in the present application can adaptively clamp, position and limit the workpiece to be tested, and realize effective clamping and docking and limiting of various workpieces without positioning structural features, thereby improving the scope of application and test accuracy. While ensuring the sealed docking between the workpiece to be tested and the pressure adapter 33, it can effectively maintain the shape of the workpiece to be tested, avoid deformation and damage to the workpiece caused by excessive limiting clamping force, improve the shape protection ability, and improve the close connection stability. The constant pressure delivery component 4 provided in the present application can effectively buffer the flow fluctuations generated when the pressure fluid is input, effectively reduce the fluid impact caused by the flow fluctuations, and improve the stability of the fluid pressure, thereby effectively reducing the maximum threshold of the limiting force, improving the stability and effect of the sealed docking, and reducing the difficulty of maintaining the docking posture without loss.

[0023] Preferably, the automatic pressure-balancing clamping assembly 5 provided on the operating table 1 is mainly used for clamping the bearing seal seat of φ20mm-φ280mm. Further preferably, the operating table 1 is also provided with an electromagnetic suction cup capable of performing adsorption-type positioning on oversized workpieces with a size exceeding φ280mm. A control system is integrated in the operating table 1 to facilitate operators to perform command operations and obtain test data. Further preferably, several specifications of movable plugs made of expandable rubber are also stored on the operating table 1, so that when the workpiece to be tested has several openings, the operator can select a suitable rubber movable plug according to the needs to seal the redundant openings, thereby ensuring the sealing of the inner cavity of the workpiece to be tested in the pressure test.

[0024] Preferably, the robot arm 2 can adopt a multi-stage rotating mechanical control arm, so that it can effectively position the pressing head 3 at any point within a certain spatial range. Preferably, a camera unit is also provided on the robot arm 2, so as to facilitate the full-process video recording of the test process and facilitate the operator to review the test based on the video. The camera unit can be arranged at multiple points to facilitate the image acquisition of the blind spot area of ​​human observation, and facilitate the user to use the image data to observe the workpiece to be tested at different angles.

[0025] Further preferably, the operating table 1 can be equipped with multiple robotic arms 2 to realize multiple uses of one machine and simultaneously perform different tests and inspections on multiple pipelines and sealed bearing seats of the engine sealing equipment waiting to be tested, thereby realizing the simultaneous implementation of multiple test and inspection tasks, effectively shortening the total working time and improving the efficiency of testing and inspection.

[0026] Preferably, a touch screen is provided on the operating table 1, so as to facilitate observation of data such as oil temperature, pressure, flow rate, and pressure holding time, and also facilitate setting of parameters such as temperature and pressure. The touch screen can also control the opening and closing of the oil circuit and the gas circuit. The operating table 1 can also store and output test data. Preferably, a storage slot is also provided on the operating table 1, so as to store movable plugs of various specifications made of expandable rubber, and then before the oil circuit and water circuit of the workpiece to be tested are subjected to pressure test, the movable plug can seal the redundant pipeline openings.

[0027] like Figures 2 to 8 As shown, the pressing head 3 includes a pressing head body 31, a high-precision limiting mechanism 32 and a pressing adapter 33. Preferably, a high-precision limiting mechanism 32 capable of limiting the docking state between the pressing head body 31 and the workpiece to be measured is provided on the pressing head body 31. Further preferably, a pressing adapter 33 capable of selectively being installed upright or inverted is detachably connected to the axial lower end of the pressing head body 31. Specifically, the high-precision limiting mechanism 32 clamps the workpiece to be measured adaptively while pressurizing the workpiece to be measured against the pressing adapter 33, thereby effectively protecting the external structure of the workpiece to be measured while ensuring the stability of the clamping positioning and the close contact of the limited docking. Further preferably, the pressing adapter 33 is composed of two tubular joints that can be connected by plugging, and the pressing adapter 33 can be disassembled and assembled according to needs to form docking bodies of different sizes, and then respectively suitable for two tubular workpieces of 1-25mm and 25mm-40mm. Further preferably, the punching adapter 33 can be installed upright when the pipe interface of the tubular workpiece is an inner cone, and the punching adapter 33 can be installed upside down at the bottom of the punching head body 31 when the pipe interface of the tubular workpiece is an outer cone, so as to adapt to tubular workpieces to be tested with different pipe interface shapes and tube cavity diameters as required.

[0028] Preferably, the pressing head body 31 includes a pressing head upper body 311 and a pressing head lower body 312 which can be coaxially docked and form a through-flow guide channel and a liquid guide channel. Preferably, the pressing head upper body 311 is detachably connected to the robot arm 2. Further preferably, a liquid flow channel 3111 and an air flow channel 3112 are provided in parallel in the pressing head upper body 311. Preferably, the pressing head lower body 312 is detachably mounted on the axial lower end of the pressing head upper body 311, and a guide channel 3121 connecting the liquid flow channel 3111 and the air flow channel 3112 is provided inside the pressing head lower body 312. Further preferably, a one-way valve is provided in the output port of the liquid flow channel 3111 and the air flow channel 3112, so as to limit the one-way output of the liquid flow and the air flow. Preferably, the pressing head lower body 312 is connected to a pressing adapter 33 away from the bottom of the pressing head upper body 311. Preferably, three mounting holes are provided at intervals in the circumferential direction on the side of the upper body 311 of the pressing head, and the lever fixing bolts for positioning the mounting position of the adjustment lever 323 are detachably installed in the mounting holes, so that the adjustment lever 323 is deflectably arranged on the outer side of the upper body 311 of the pressing head in a manner parallel to the tangent line of the cross section of the upper body 311 of the pressing head. Preferably, three outer vertical grooves 3122 for accommodating at least part of the hook 321 are provided at intervals in the circumferential direction on the outer side of the lower body 312 of the pressing head. Preferably, a through vertical hole 3123 is also provided at the top of the outer vertical groove 3122, which is connected to the groove cavity thereof and limits the movement direction of the hook pull rod 322. Preferably, a slope protrusion is provided in the outer vertical groove 3122, so that a sloped surface is constructed on the groove bottom of the outer vertical groove 3122 on the radial inner side, so that when the hook 321 moves downward, the hook 321 can deflect outward around the rotation connection center between it and the hook pull rod 322 under the limitation of the sloped surface, thereby realizing the opening of the hook 321 during the downward movement. Preferably, the sloped surface is a high-gloss surface that facilitates 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 descent, and the hook 321 is forced to deflect around the connecting shaft between it and the hook pull rod 322.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] Preferably, the axial lower end of the arc-shaped rod body 3211 of the hook 321 is provided with an anti-slip abutment block 3212 that can abut against the outer wall surface of the workpiece to be measured. Further preferably, the axial upper end of the arc-shaped rod body 3211 is provided with a rotating connection pin that can be rotatably inserted on the hook pull rod 322 and a first mounting groove for mounting the rotating connection pin.

[0033] Preferably, a second mounting groove is provided at the top of the hook pull rod 322, and a pin is inserted transversely in the second mounting groove. Specifically, a mounting bearing body 3221 is sleeved on the pin. The mounting bearing body 3221 can be mounted on the half-moon groove 3234 of the tilting main rod 3231.

[0034] like Figure 3 and Figure 7 As shown, the inclined upper end of the inclined main rod 3231 of the adjustment lever 323 is connected with a camber shaft rod 3232. Further preferably, a rolling bearing body 3233 capable of rolling against the inner top surface of the limiting pressure cover 324 is mounted on the camber 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 deflectably installed on the side of the pressing head upper body 311 through the lever fixing bolt. Preferably, a semi-moon groove 3234 with an upward opening is also provided at the inclined lower end of the inclined main rod 3231, so that the hanging bearing body 3221 at the axial upper end of the hook pull rod 322 is hung in the semi-moon groove 3234 in a manner that it can rotate around the axis and the abutment support point is adaptively changed, so that the hook pull rod 322 can be pulled up when the inclined main rod 3231 is deflected. Preferably, when the tilting main rod 3231 is deflected, the mounting bearing body 3221 can be transmitted, so that the hook pull rod 322 is lifted and lowered, wherein the mounting bearing body 3221 will produce a relative rotation around its own axis, so that the surface area where the mounting bearing body 3221 contacts the arc surface of the groove cavity of the semi-lunar groove 3234 is changed, thereby changing the transmission force point of the mounting bearing body 3221, thereby effectively compensating for the slight displacement in the horizontal direction, and realizing the small-stroke deflection transmission of the large force arm formed by the tilting main rod 3231 in a tilted posture, which can be approximated as a lifting and pulling movement. Due to the adaptive rotation of the mounting bearing body 3221 and the change of the force support point, the slight displacement can be converted into the rolling of the mounting bearing body 3221 in the semi-lunar groove 3234.

[0035] 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°.

[0036] like Figure 8As shown, the top of the limiting gland 324 is provided with a through hole 3241 for movably inserting the upper body 311 of the pressing head, so that the limiting gland 324 moves axially in a manner of being movably mounted on the upper body 311 of the pressing head, and the limiting gland 324 forms a radial inner ring plate body abutting against the rolling bearing body 3233 at the top of its annular shell body. Preferably, an inner thread 3242 is also provided on the inner wall surface of the limiting gland 324, which can cooperate with the outer thread 3124 on the inner wall surface of the limiting gland 324 to realize the threaded sleeve connection between the limiting gland 324 and the lower body 312 of the pressing head. Preferably, an anti-damage limiting step 3243 is also provided on the inner bottom side of the limiting gland 324. Specifically, the anti-damage limiting step 3243 is an inner inclined annular surface provided on the lower edge of the limiting gland 324, and the slope of the inner inclined annular surface is consistent with the outer arc surface of the hook 321. When the limit cover 324 descends, the inner inclined annular surface formed by the anti-damage limit step 3243 can abut against the outer surface of the hook 321, thereby effectively clamping the hook 321 by means of the clamping hoop, 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. The present application effectively limits the abutment area between the hook 321 and the limit cover 324 by setting the anti-damage limit step 3243, avoids the hook 321 from contacting the internal thread 3242, and prevents the hook 321 from damaging the thread. In addition, the anti-damage limit step 3243 can increase the contact area between the hook 321 and the internal thread 3242, and improve the stability of the clamping hoop, so that the clamped hook 321 can stably clamp the workpiece to be measured.

[0037] Preferably, the pressure adapter 33 includes a large-diameter joint 331 and a small-diameter joint 332, and the small-diameter joint 332 is detachably threadedly connected to the axial lower end of the large-diameter joint 331. The lower end of the small-diameter joint 332 is provided with a small-diameter tapered outer bevel adapted to a tubular workpiece with an inner diameter of 1mm-25mm and an inner conical surface. Further preferably, the upper end of the small-diameter joint 332 is also provided with a small-diameter tapered inner bevel inserted into the large-diameter joint 331 and connected to the large-diameter tapered inner bevel of the large-diameter joint 331. Specifically, the small-diameter tapered inner bevel can adapt to a tubular workpiece with an outer diameter of 1mm-25mm and an outer conical surface. Specifically, 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 are provided with external threads with equal annular diameter and tooth diameter, so that the large-diameter joint 331 can be selectively connected to the lower body 312 of the pressing head or the small-diameter joint 332 can be selectively connected to the lower body 312 of the pressing head, thereby realizing the positive or negative installation of the pressing adapter 33, which is convenient for adapting to the workpiece to be measured with a conical outer bevel or a workpiece to be measured with a conical inner bevel.

[0038] Preferably, the lower end of the large-diameter joint 331 is provided with a large-diameter tapered outer inclined surface adapted to a tubular workpiece having an inner diameter of 25 mm-40 mm and an inner tapered surface.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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. Fig. 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.

[0043] The present application arranges the variable-volume pressure-regulating chamber shell 43 and the inlet pipe 45 in a symmetrical manner, so that the inlet pipe 45 can more accurately and timely change the volume of the inflation chamber according to the fluctuation of the flow input by the inlet pipe 45, and then enhance the buffering effect of the expansion deformation of the expansion buffer chamber shell 44 on the flow fluctuation through the coordinated linkage between the variable-volume pressure-regulating chamber shell 43 and the expansion buffer chamber shell 44.

[0044] Preferably, the variable volume pressure regulating chamber housing 43 comprises a first cavity tube 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 cavity tube 431, so that an air-filled chamber that is not connected to the diversion cavity tube 42 is formed in the first cavity tube 431. Further preferably, the surface of the piston body 432 away from the diversion cavity tube 42 is connected to the piston rod 433 that passes through the top cover of the first cavity tube 431. The end of the piston rod 433 outside the first cavity tube 431 is connected to the linkage cross bar 434.

[0045] Preferably, the expansion buffer chamber shell 44 includes a second cavity tube 441, an elastic expansion ring piece 442, a ring body inflation attachment cavity 443, a wrapping ring sleeve 444, a linkage rod 445 and a connecting air pipe 446. Preferably, the second cavity tube 441 is inserted on the guide cavity tube 42. An elastic expansion ring piece 442 that can expand and deform with the pressure change of the cavity fluid is arranged on the tube body of the second cavity tube 441, and a ring body inflation attachment cavity 443 covering the elastic expansion ring piece 442 is also sleeved on the outside of the second cavity tube 441. Preferably, a wrapping ring sleeve 444 that limits the area where the elastic expansion ring piece 442 can be deformed is also sleeved on the second cavity tube 441. Specifically, the wrapping ring 444 can undergo axial translation as the fluid pressure changes, thereby exposing elastic expansion ring pieces 442 of different sizes under different fluid pressure conditions, so that the elastic expansion ring piece 442 can adaptively buffer the impact force generated by the fluctuation of the fluid, reduce the impact force of the fluid output by the second cavity 441, and thus improve the stability of the input flow of the pressure test. Preferably, the wrapping ring 444 is also connected to the linkage rod 445 that runs through the ring body inflatable attached cavity 443. Further preferably, one end of the linkage rod 445 located outside the ring body inflatable attached cavity 443 is connected to the linkage cross bar 434, so that the wrapping ring 444 can move synchronously with the piston body 432, thereby changing the actual deformable area of ​​the elastic expansion ring piece 442, and then adaptively effectively buffering the impact force generated by flow fluctuations of different sizes. Preferably, the ring body inflatable attached cavity 443 is connected to the inflatable chamber of the first cavity 431 through the connecting air pipe 446, so as to ensure the air pressure balance of the inner cavities of the two. Preferably, the end of the wrapping ring 444 is also provided with a guide slide 447 arranged in alignment with the linkage rod 445. Further preferably, the guide slide 447 is guided by penetrating the end cavity wall of the ring body inflation cavity 443. Preferably, an inflation port 448 is also installed on the end cavity wall of the ring body inflation cavity 443.

[0046] like Fig.10 and Fig.11As shown, the automatic pressure-balancing clamping assembly 5 includes a circular support frame base 51, a stepper motor 52, a slider pushing a rotating force arm 53, a sliding connecting rod 54, a slider 55, a linear guide rail 56, a clamp head 57 and a clamp head center fixing frame 58. Preferably, the circular support frame base 51 is embedded on the operating table 1. An upper groove cavity is provided in the center of the bottom of the circular support frame base 51. The stepper motor 52 is installed in the upper groove cavity by fixing screws, and a slider pushing a rotating force arm 53 in the installation cavity of the circular support frame base 51 is connected to the top of the transmission shaft of the stepper motor 52. Preferably, the slider pushing the rotating force arm 53 is a cross structure, and a sliding connecting rod 54 is hinged at the radial distal end of the slider pushing the rotating force arm 53 away from the stepper motor 52. Preferably, four linear guide rails 56 are arranged circumferentially at intervals 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 that the movement direction of the slider 55 is limited by the linear guide rail 56. Further preferably, the slider 55 is also hinged with the sliding link 54, so that the sliding link 54 can drive the slider 55 to perform directional translation on the linear guide 56. Specifically, the slider pushes the rotating force arm 53 to simultaneously drive the four sliding links 54 to move under the drive of the stepper motor 52, thereby driving the four sliders 55 to move centrifugally or centrifugally, and then when the four sliders 55 perform synchronous centrifugal translation, the clamp head 57 connected to the four sliders 55 can clamp the large-sized workpiece to be tested such as the sealed bearing seat in a position clamping manner. Preferably, the clamp head center fixing frame 58 is placed above the slider pushes the rotating force arm 53 in a manner of being connected to the four linear guides 56 at the same time. Preferably, the stepper motor 52 is a servo motor capable of setting the torque of the motor transmission. The purpose of driving the stepper motor 52 in this application is to ensure that it can be quantitatively deflected and positioned according to demand, especially that it can pre-set the clamping pressure to produce controllable quantitative deflection, so as to clamp the sealed bearing seats of different specifications with a fixed force, thereby effectively ensuring the stability of the clamping and the ability to protect the appearance. Since the sealed bearing seat has a high assembly accuracy requirement, it is necessary to ensure the integrity of its appearance when clamping it, but the existing clamping structure is very likely to cause damage or deformation to the appearance during clamping. Therefore, it is necessary to set the clamping pressure. This application sets the clamping force threshold of the workpiece according to the basic data and material characteristics of the workpiece collected in advance, so that the servo motor limits its working deflection mechanism by pre-setting the torque threshold, and then 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 non-destructively through the preset clamping force. Preferably, the automatic pressure-balanced clamping assembly 5 is mainly used for the clamping and positioning of the bearing seal seat of φ20mm-φ280mm. When the workpiece size exceeds this range, the workpiece is directly magnetically limited by the electromagnet chuck on the operating table 1.

[0047] The present application also provides a pressure test method for a tooling-free pressure test bench, which is designed based on the test bench in the aforementioned content.

[0048] When the workpiece to be measured is a tubular part: The pressing adapter 33 is adaptively assembled onto the pressing head body 31 according to the interface shape of the workpiece to be measured, and the port of the workpiece to be measured is connected to the pressing adapter 33 .

[0049] By screwing the limit pressure cover 324, the lowered limit pressure cover 324 pushes the adjustment lever 323 to deflect, so that the hook pull rod 322 and the hook 321 are pulled upward under the pulling of the adjustment lever 323, and the multiple hooks 321 cooperate to hold the workpiece to be measured under the limit of the limit pressure cover 324, so that the workpiece to be measured is pressurized and abutted against the pressing adapter 33, thereby realizing a pressurized sealing abutment that can protect the appearance of the tubular workpiece to be measured.

[0050] When the workpiece to be measured is a large part such as a sealed bearing seat: The sealed bearing seat is placed on the center fixing frame 58 of the clamp head, and then the stepper motor 52 drives the slider to push the rotating force arm 53 to deflect, thereby driving the sliding link 54 to move, and then the sliding link 54 pulls the slider 55 to perform directional translation on the linear guide rail 56, so that the clamp heads 57 on the four sliders 55 cooperate with each other to clamp the workpiece to be measured.

[0051] The limiting pressure cover 324 is screwed to move upward, so that the hook 321 descends in a linkage manner, and the hook 321 is gradually spread open during the descending process, so that the pressing adapter 33 is fully exposed to eliminate structural interference.

[0052] The position of the pressing head 3 is adjusted by the robot arm 2 so that the pressing adapter 33 of the pressing head 3 abuts against the port of the bearing sealing seat, thereby achieving limited sealing abutment between the workpiece and the test equipment.

[0053] The present invention is not limited to the above optional implementation modes. Anyone can derive other various forms of products under the enlightenment of the present invention. However, no matter what changes are made in the shape or structure, all technical solutions that fall within the scope of the claims of the present invention fall within the protection scope of the present invention. Those skilled in the art should understand that the specification of the present invention and its drawings are illustrative and do not constitute limitations on the claims. The scope of protection of the present invention is defined by the claims and their equivalents. Throughout the text, the features guided by "preferably" are only an optional method and should not be understood as having to be 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 pressing it against the pressing adapter (33).

2. The tooling-free pressure test bench according to claim 1, characterized in that: The pressing head body (31) comprises a pressing head upper body (311) and a pressing head lower body (312) which can be coaxially connected and form a through-going gas-guiding channel and a through-going liquid-guiding channel, wherein: 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 is provided with a flow guide channel (3121) connecting the liquid flow channel (3111) and the air flow channel (3112). The bottom of the pressing head lower body (312) is connected to the pressing adapter (33) that can be selectively installed upright or inverted.

3. The tooling-free pressure test bench according to claim 2, characterized in that: The high-precision limiting mechanism (32) comprises a hook (321), a hook pull rod (322), a position adjustment lever (323) and a limiting pressure cover (324), wherein: 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 hooked on the position adjustment lever (323), 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; The position adjustment lever (323) is rotatably mounted on the outer surface of the pressing head upper body (311); the position limiting pressure cover (324) for driving the position adjustment lever (323) to be deflected is also sleeved on the pressing head upper body (311); the position limiting pressure cover (324) is also threadedly sleeved on the pressing head lower body (312).

4. The tooling-free pressure test bench according to claim 3, 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.

5. The tooling-free pressure test bench according to claim 4, 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).

6. The tooling-free pressure test bench according to claim 5, 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).

7. The tooling-free pressure test bench according to claim 6, 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).

8. The tooling-free pressure test bench according to claim 7, 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).

9. The tooling-free pressure test bench according to claim 8, 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.

Images