Turbine pump overspeed test device

Abstract

The application discloses a steam-driven pump overspeed test device, which comprises a driving mechanism, a transmission mechanism and a lifting mechanism, the driving mechanism is used for providing rotating power, one end of the transmission mechanism is in driving connection with the driving mechanism, the other end of the transmission mechanism is in transmission connection with the lifting mechanism, the transmission mechanism transmits the torque provided by the driving mechanism to the lifting mechanism, the lifting mechanism is used for converting the torque into linear motion power and transmitting the linear motion power to a speed regulator of the steam-driven pump, so that the speed regulator driving rod of the steam-driven pump is driven to move upwards, the valve core of a stop valve is driven to move downwards, and the overspeed effect of the steam-driven pump is realized. The steam-driven pump overspeed test device improves the automation degree, liberates the manpower, reduces the limitation of the experience and ability of the operator, reduces the operation risk, and improves the protection of the operator safety.

Description

Technical Field

[0001] The invention relates to the field of pneumatic pump overspeed testing, in particular to a pneumatic pump overspeed testing device. Background Art

[0002] The auxiliary feedwater system (ASG) is a dedicated safety feature in pressurized water reactor (PWR) nuclear power plants. Its primary function is to remove residual heat from the reactor core in the event of an accident, ensuring reactor safety and control. As the active component of the ASG system, the pneumatic auxiliary feedwater pump (pneumatic pump) is a nuclear safety device that directly impacts the ASG's normal operation. The reliability of the ASG pneumatic pump is crucial to nuclear power plant safety. Therefore, to ensure the pump's safety and availability, regular overspeed testing is required.

[0003] In the existing technology, technicians use homemade crowbars to manually pry the governor and the regulating valve connecting rod to complete the ASG pneumatic pump overspeed test. The disadvantages of using manual crowbars are as follows:

[0004] 1) Experienced operators are required, the requirements for operators are high, and manual operation is inefficient and has limitations;

[0005] 2) The structure is simple and inconvenient to use by manual operation;

[0006] 3) During the test, the pump speed could not increase uniformly due to the inability of human power to output linearly, resulting in poor results;

[0007] 4) Overspeed testing is a high-risk operation and relies entirely on manpower, which is unsafe;

[0008] 5) It is not conducive to the collection of historical fixed experience values ​​and its contribution to future experiments is small. Summary of the Invention

[0009] The technical problem to be solved by the present invention is to provide a pneumatic pump overspeed test device.

[0010] The technical solution adopted by the present invention to solve the technical problem is: constructing a pneumatic pump overspeed test device, which includes a driving mechanism, a transmission mechanism and a lifting mechanism;

[0011] The driving mechanism is used to provide rotational power;

[0012] One end of the transmission mechanism is drive-connected to the drive mechanism, and the other end thereof is drive-connected to the lifting mechanism. The transmission mechanism transmits the torque provided by the drive mechanism to the lifting mechanism. The lifting mechanism is used to convert the torque into power for linear motion and transmit it to the speed regulator of the pneumatic pump to drive the speed regulator drive rod of the pneumatic pump to move upward, thereby causing the valve core of the shut-off valve to move downward.

[0013] In some embodiments, the transmission mechanism includes a transmission assembly connected to the drive mechanism and a reduction assembly connected to the transmission assembly, the reduction assembly including a first reduction shaft, a reduction transmission member transmission-connected to the first reduction shaft, and a second reduction shaft coaxially connected to the reduction transmission member;

[0014] The first reduction shaft is used to transmit the power of the transmission assembly to the second reduction shaft through the reduction transmission member;

[0015] The second reduction shaft is connected to the lifting mechanism, thereby transmitting the power provided by the reduction transmission member to the lifting mechanism, so that the lifting mechanism can move in the height direction.

[0016] In some embodiments, the lifting mechanism includes a first transmission block and a second transmission block disposed on opposite sides of the second reduction shaft, the first transmission block and the second transmission block are both movably connected to the second reduction shaft, and the first transmission block and the second transmission block are symmetrically disposed;

[0017] The first transmission block is hinged to a first connecting rod and a second connecting rod at the upper and lower sides respectively, and the second transmission block is hinged to a third connecting rod and a fourth connecting rod at the upper and lower sides respectively;

[0018] The first connecting rod, the second connecting rod, the third connecting rod, and the fourth connecting rod together form a parallelogram structure.

[0019] In some embodiments, the transmission assembly includes a transmission coupling connected to the drive mechanism, a telescopic transmission rod, a transmission shaft key, and a transmission shaft matching sleeve;

[0020] The telescopic transmission rod is connected to the transmission shaft via a first universal coupling;

[0021] The open end of the transmission shaft matching sleeve is provided with a positioning cover plate, and the telescopic transmission rod is passed through the positioning cover plate and fixedly connected to the transmission shaft key;

[0022] The transmission shaft key is arranged in the transmission shaft matching sleeve and is in transmission connection with the transmission shaft matching sleeve;

[0023] The first reduction shaft is connected to an end of the transmission shaft matching sleeve away from the telescopic transmission rod through a second universal joint.

[0024] In some embodiments, the pneumatic pump overspeed test device further includes a transmission box assembly, the transmission box assembly including a transmission box housing and a second reduction bearing and a first reduction bearing disposed in the transmission box housing;

[0025] The second reduction bearing is sleeved on the outer circumference of the second reduction shaft, and the first reduction bearing is sleeved on the outer circumference of the first reduction shaft, so that the transmission box housing can position the second reduction shaft and the first reduction shaft.

[0026] In some embodiments, the driving mechanism is a servo motor, the first reduction shaft is a worm shaft, the reduction transmission member is a worm gear, and the second reduction shaft is a screw shaft.

[0027] In some embodiments, the lifting mechanism further includes a lifting base and a guide column provided on the lifting base;

[0028] The lifting base is hinged to the second connecting rod and the fourth connecting rod at the same time, and a guide groove for installing the guide column is provided at the top of the lifting base, the bottom end of the guide column is slidably placed in the guide groove, and the top end is fixedly connected to the transmission box housing; or, the lifting base is hinged to the first connecting rod and the third connecting rod at the same time, and a guide groove for installing the guide column is provided at the top of the lifting base, the top end of the guide column is slidably placed in the guide groove, and the bottom end is fixedly connected to the transmission box housing.

[0029] In some embodiments, the pneumatic pump overspeed test device further includes a support frame and a limit assembly for supporting the entire device; the driving mechanism is fixed to the support frame;

[0030] The limiting assembly includes a fixing seat arranged on the supporting frame, and a coupling bearing arranged on the fixing seat, and the coupling bearing is sleeved on the outer periphery of the transmission coupling.

[0031] In some embodiments, the transmission mechanism also includes a guide sleeve mounted on the outer periphery of the first reduction shaft, the guide sleeve is arranged on the side of the support frame close to the lifting mechanism, and the guide sleeve can be moved on the support frame along the height direction of the lifting mechanism to achieve guiding and supporting effects when the first reduction shaft is raised and lowered.

[0032] In some embodiments, the lifting mechanism further comprises a lifting top seat and an insert head;

[0033] The lifting top seat is hinged to the first connecting rod and the third connecting rod at the same time, and is connected to the socket head through a positioning assembly;

[0034] The socket head is used to be connected to the speed regulator of the pneumatic pump.

[0035] In some embodiments, the positioning assembly includes a cotter pin and a connecting pin provided at one end of the cotter pin, wherein one end of the cotter pin is provided with a through pin hole for installing the connecting pin;

[0036] A first connecting part is provided at the top of the lifting seat and a second connecting part is provided at the bottom of the socket head. A first positioning hole is provided on the first connecting part, and a second positioning hole is provided on the second connecting part. The cotter pin is passed through the first positioning hole and the second positioning hole to connect the lifting seat and the socket head together. The second connecting part is placed in the first connecting part, and the second connecting part and the first connecting part have a predetermined gap to form a live connection between the lifting seat and the socket head.

[0037] The implementation of the present invention has the following beneficial effects: the pneumatic pump overspeed test device improves the degree of automation, liberates manpower, reduces the limitations on the operator's experience and ability, and at the same time reduces operational risks, improves the protection of operator safety, realizes the collection of fixed experience values ​​in the test history, and increases the pass rate of the overspeed test. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solution of the present invention, the present invention will be further described below with reference to the accompanying drawings and embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and should not be considered as limiting the scope. A person of ordinary skill in the art can derive other relevant drawings based on these drawings without inventive effort. In the drawings:

[0039] Figure 1 is a schematic structural diagram of a pneumatic pump overspeed test device in some embodiments of the present invention;

[0040] Figure 2 This invention Figure 1 An enlarged schematic diagram of the transmission mechanism and the lifting mechanism;

[0041] Figure 3 This invention Figure 2 Schematic cross-sectional view in the AA direction;

[0042] Figure 4 This invention Figure 3 Schematic cross-sectional view in the BB direction. DETAILED DESCRIPTION

[0043] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific embodiments of the present invention are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the directions or positional relationships indicated by "front", "back", "up", "down", "left", "right", "longitudinal", "horizontal", "vertical", "horizontal", "top", "bottom", "inside", "outside", "head", "tail", etc. are based on the directions or positional relationships shown in the accompanying drawings and are constructed and operated in specific directions. They are only for the convenience of describing the technical solution and do not indicate that the devices or components referred to must have specific directions. Therefore, they should not be understood as limiting the present invention.

[0044] It should also be noted that, unless otherwise clearly specified and limited, terms such as "installed", "connected", "connected", "fixed", and "set" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. When an element is referred to as being "on" or "under" another element, the element can be "directly" or "indirectly" located on the other element, or there may be one or more intervening elements. The terms "first", "second", "third", etc. are only for the convenience of describing the present technical solution, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second", "third", etc. may explicitly or implicitly include one or more of such features. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0045] See also Figures 1 to 4 , is a pneumatic pump overspeed test device in some embodiments of the present invention, which is used in pneumatic pump overspeed tests, for example, it is applied to TWL type ASG pneumatic auxiliary water pumps. The pneumatic pump overspeed test device includes a driving mechanism 1, a transmission mechanism 2 and a lifting mechanism 3. The driving mechanism 1 can be a servo motor 11, which is used to provide rotational power. Since the servo motor 11 can provide linear output, it can make the speed of the pneumatic pump 4 increase at a uniform speed during the pneumatic pump overspeed test. One end of the transmission mechanism 2 is connected to the driving mechanism 1, and the other end is connected to the lifting mechanism 3. The transmission mechanism 2 transmits the torque provided by the driving mechanism 1 to the lifting mechanism 3. The lifting mechanism 3 is used to convert the torque into linear motion power and transmit it to the speed regulator of the pneumatic pump 4, so as to drive the speed regulator drive rod of the pneumatic pump 4 to move upward, thereby causing the stop valve spool to move downward, thereby achieving the overspeed effect of the pneumatic pump 4.

[0046] It can be understood that the pneumatic pump overspeed test device uses the servo motor 11 as the power output source to achieve a uniform increase in the pump speed during the execution of the pneumatic pump overspeed test, reduce the impact of fluctuations, improve the degree of automation, liberate manpower, reduce the limitations of the operator's experience and ability, and at the same time reduce operational risks, improve the protection of operator safety, realize the collection of fixed experience values ​​in the test history, and increase the pass rate of the overspeed test.

[0047] Among them, Figure 2 As shown, the transmission mechanism 2 includes a transmission assembly connected to the drive mechanism 1 and a reduction assembly connected to the transmission assembly. The reduction assembly includes a first reduction shaft 25, a reduction transmission member 27 connected to the first reduction shaft 25, and a second reduction shaft 29 coaxially connected to the reduction transmission member 27. The first reduction shaft 25 is used to transmit the power of the transmission assembly to the second reduction shaft 29 through the reduction transmission member 27. The second reduction shaft 29 is connected to the lifting mechanism 3, thereby transmitting the power provided by the reduction transmission member 27 to the lifting mechanism 3, so that the lifting mechanism 3 can move in the height direction. The axial direction of the second reduction shaft 29 is perpendicular to the axial direction of the first reduction shaft 25. For example, if the first reduction shaft 25 is set horizontally left and right, the second reduction shaft 29 is set horizontally front and back. In this way, the dimensions of the transmission mechanism 2 are reasonably arranged in the horizontal left and right and front and back directions, avoiding the problem of excessive size in one direction.

[0048] Since the lifting mechanism 3 is required to move slowly and the amount of movement is precisely controllable when moving upward, preferably, the first reduction shaft 25 is a worm shaft, the reduction transmission member 27 is a worm wheel, and the second reduction shaft 29 is a screw shaft. The more teeth on the worm wheel, the more obvious the reduction effect. The worm shaft rotates one circle, and the worm wheel rotates one tooth. For example, if there are 50 teeth, the worm needs to rotate 50 circles before the worm wheel rotates one circle and the screw shaft rotates one circle. In addition, the worm shaft and worm wheel have a self-locking function. When the servo motor 11 rotates forward, the lifting mechanism 3 rises. When the servo motor 11 is powered off, the lifting mechanism 3 remains at a predetermined height. When the servo motor 11 reverses, the lifting mechanism 3 is lowered. The reduction assembly adopts a worm drive with a reduction transmission member, which can achieve a large transmission ratio between spatially staggered axes. It has low noise, smooth transmission, and self-locking transmission. The second reduction shaft 29 can be connected to the lifting mechanism 3 and drive the lifting mechanism 3 to move up and down through its characteristics. The screw shaft adopts point contact rolling motion, with low friction resistance, high sensitivity, no vibration at startup, and no creeping at low speed. Therefore, micro feed can be precisely controlled with high transmission efficiency.

[0049] like Figure 3As shown, the lifting mechanism 3 includes a first transmission block 31 and a second transmission block 32 which are relatively arranged on both sides of the second reduction shaft 29. The first transmission block 31 and the second transmission block 32 are both movably connected to the second reduction shaft 29, and the first transmission block 31 and the second transmission block 32 are symmetrically arranged. The rotation direction of the first transmission block 31 and the rotation direction of the second transmission block 32 are opposite. In this embodiment, the first transmission block 31 is a left-handed transmission block and the second transmission block 32 is a right-handed transmission block. When the second reduction shaft 29 rotates, the first transmission block 31 and the second transmission block 32 move toward the center at the same time to realize the lifting of the lifting mechanism 3.

[0050] The first transmission block 31 is hinged with a first connecting rod 311 and a second connecting rod 312 on its upper and lower sides, respectively. The second transmission block 32 is hinged with a third connecting rod 321 and a fourth connecting rod 322 on its upper and lower sides, respectively. The first connecting rod 311 and the second connecting rod 312 are symmetrically arranged vertically, the third connecting rod 321 and the fourth connecting rod 322 are symmetrically arranged vertically, the first connecting rod 311 and the third connecting rod 321 are symmetrically arranged horizontally, and the second connecting rod 312 and the fourth connecting rod 322 are symmetrically arranged horizontally. The first connecting rod 311, the second connecting rod 312, the third connecting rod 321, and the fourth connecting rod 322 together form a parallelogram structure. The parallelogram structure requires less space in height than other conventional components, reducing space occupation and simplifying the structure.

[0051] like Figure 2 As shown, the transmission assembly includes a transmission coupling 21 connected to the drive mechanism 1, a telescopic transmission rod 22, a transmission shaft key 23 and a transmission shaft matching sleeve 24. The transmission coupling 21 can be connected to the output main shaft of the drive mechanism 1 through an ordinary coupling. The telescopic transmission rod 22 is connected to the transmission coupling 21 through a first universal coupling 26. The open end of the transmission shaft matching sleeve 24 is provided with a positioning cover plate 241. The telescopic transmission rod 22 is passed through the positioning cover plate 241 and fixedly connected to the transmission shaft key 23. The transmission shaft key 23 is provided in the transmission shaft matching sleeve 24 and is transmission-connected to the transmission shaft matching sleeve 24. The first reduction shaft 25 is connected to the end of the transmission shaft matching sleeve 24 away from the telescopic transmission rod 22 through a second universal coupling 28.

[0052] The transmission mechanism 2 utilizes a universal coupling, enabling continuous rotation of the two connected shafts even when they are not coaxial and at an angle, reliably transmitting torque and motion. The universal coupling also features significant angular compensation, a compact structure, and high transmission efficiency. In this embodiment, the universal coupling is preferably a cross-axis universal coupling, which offers significant angular compensation and utilizes an integral fork, resulting in greater reliability. Compared to other couplings with the same swing diameter, it transmits greater torque, making it more suitable for mechanical equipment with limited swing diameters. Furthermore, it offers stable operation, low noise, and easy assembly and maintenance. In other embodiments, the universal coupling may also be a ball cage, ball fork, cam, or other type, as long as it meets the requirements.

[0053] Because the lifting mechanism 3 employs a parallelogram-shaped lifting structure, the first reduction shaft 25 and the second reduction shaft 29 also rise and fall synchronously, necessitating the use of a universal joint and a telescopic transmission rod 22. The telescopic transmission rod 22 automatically adjusts as the lifting mechanism 3 rises and falls. When the lifting mechanism 3 begins to rise from its initial position, the length of the telescopic transmission rod 22 automatically shortens to coordinate with the movement of the lifting mechanism 3. A positioning cover plate 241 is provided at the open end of the transmission shaft mating sleeve 24, which is used to position the telescopic transmission rod 22.

[0054] In this embodiment, the telescopic transmission rod 22 is inserted through the positioning cover plate 241 and fixedly connected to the transmission shaft key 23. The transmission shaft key 23 is disposed in and fixedly connected to the transmission shaft mating sleeve 24. It is understood that the telescopic transmission rod 22 can drive the transmission shaft mating sleeve 24 to rotate via the transmission shaft key 23. In this embodiment, the transmission shaft key 23 is preferably a spline. Such a spline has a simple structure, high torque transmission, good load-bearing capacity, easy assembly and disassembly, easy maintenance and repair, good dynamic balance, and high precision. In other embodiments, the telescopic transmission rod 22 can drive the transmission shaft mating sleeve 24 to rotate via a flat key, a woodruff key, or a faceted key.

[0055] Furthermore, the telescopic transmission rod 22 can be fixedly connected to the transmission shaft matching sleeve 24 through a fixed pin, and can also be fixedly connected through a fixed positioning slot, which can be set according to actual conditions.

[0056] The pneumatic pump overspeed test device also includes a support frame 6 and a limit assembly 7 for supporting the entire device. The driving mechanism 1 is fixed to the support frame 6. The limit assembly 7 includes a fixed seat 71 provided on the support frame 6 and a coupling bearing 72 provided on the fixed seat 71. The coupling bearing 72 is sleeved on the outer periphery of the transmission coupling 21 to support and limit the transmission coupling 21, thereby improving the operating stability of the pneumatic pump overspeed test device. The servo motor 11 can also be connected to the support frame 6 through fasteners.

[0057] like Figure 3 and Figure 4 As shown, the pneumatic pump overspeed test device also includes a transmission box assembly 5, which includes a transmission box housing 51 and a second reduction bearing 52 and a first reduction bearing 53 provided in the transmission box housing 51. The second reduction bearing 52 is sleeved on the outer periphery of the second reduction shaft 29, and the first reduction bearing 53 is sleeved on the outer periphery of the first reduction shaft 25, so that the transmission box housing 51 can limit the second reduction shaft 29 and the first reduction shaft 25. It can be understood that the transmission box housing 51 can include a transmission box left housing 511 and a transmission box right housing 512, and the transmission box left housing 511 and the transmission box right housing 512 are connected together by a transmission box screw 513. The transmission box assembly 5 can also include a transmission box bearing cover 54 and a transmission box bearing cover screw 55 to cooperate with the second reduction bearing 52 and the first reduction bearing 53 to achieve the fixing and supporting function of the second reduction shaft 29 and the first reduction shaft 25.

[0058] Furthermore, the lifting mechanism 3 also includes a lifting base 33 and a guide column 34 provided on the lifting base 33. The lifting base 33 is hinged to the second connecting rod 312 and the fourth connecting rod 322 at the same time, and a guide groove 331 is provided at the top thereof for the guide column 34 to be installed. The opening of the guide groove 331 faces the height direction of the lifting mechanism 3, and its depth is designed so that the guide column 34 does not fall out of the guide groove 331. The bottom end of the guide column 34 is placed in the guide groove 331, and the top end is connected to the transmission box housing 51 by a fastener so that the transmission box housing 51 can only move along the height direction of the lifting mechanism 3, thereby guiding and limiting the lifting and lowering of the transmission box assembly 5, and also providing a guiding and limiting function for the movement of the entire lifting mechanism 3. In some other embodiments, the guide groove 331 can be replaced by a guide rail for guidance.

[0059] In an optional embodiment, the above-mentioned guide column 34 can also be arranged at the upper end of the transmission box housing 51, that is, the lifting base 33 is hinged to the first connecting rod 311 and the third connecting rod 321 at the same time, and a guide groove 331 for installing the guide column 34 is provided at its top end, the top end of the guide column 34 is slidably placed in the guide groove 331, and the bottom end thereof is fixedly connected to the transmission box housing 51.

[0060] Among them, Figure 1 and Figure 2 As shown, the transmission mechanism 2 further includes a guide sleeve 251 sleeved around the outer circumference of the first reduction shaft 25. The guide sleeve 251 is disposed on the side of the support frame 6 near the lifting mechanism 3. The guide sleeve 251 is movable on the support frame 6 along the height direction of the lifting mechanism 3 to provide guidance and support for the first reduction shaft 25 during the raising and lowering of the first reduction shaft 25. It is understandable that, since the second reduction shaft 29 and the first reduction shaft 25 are raised and lowered along the height direction along with the lifting mechanism 3 during operation, the guide sleeve 251 is also configured to be raised and lowered along with the second reduction shaft 29 and the first reduction shaft 25.

[0061] The lifting mechanism 3 also includes a lifting top seat 35 and a socket head 36. The lifting top seat 35 is hinged to the first connecting rod 311 and the third connecting rod 321 at the same time, and is connected to the socket head 36 through a positioning component 37. The socket head 36 is used to connect to the speed regulator of the pneumatic pump 4. Figure 1 As shown, the speed regulator of the pneumatic pump 4 has a lever fulcrum 41, and the socket head 36 pushes up the right side of the speed regulator relative to the lever fulcrum 41, thereby causing the valve core of the stop valve on the left side of the speed regulator to move downward, increasing the steam intake amount, and increasing the speed of the pneumatic pump 4. At the same time, a contact portion matching the shape of the speed regulator is provided on the socket head 36, thereby cooperating with the speed regulator to increase the upward external force.

[0062] The positioning assembly 37 includes a cotter pin 371 and a connecting pin 372 provided at one end of the cotter pin 371. A through pin hole 3171 is provided at one end of the cotter pin 371 for installing the connecting pin 372. The top of the lifting top seat 35 is provided with a first connecting portion 351, and the bottom of the socket head 36 is provided with a second connecting portion 361. The first connecting portion 351 is provided with a first positioning hole 3511, and the second connecting portion 361 is provided with a second positioning hole 3611. The cotter pin 371 is passed through the first positioning hole 3511 and the second positioning hole 3611. The two positioning holes 3611 connect the lifting top seat 35 and the socket head 36 together. The second connecting part 361 is installed in the first connecting part 351, and the distance between the inner wall surfaces of the first connecting part 351 is greater than the distance between the outer wall surfaces of the second connecting part 361, that is, there is a certain gap distance between the first connecting part 351 and the second connecting part 361 after the installation is completed, so that a live connection is formed between the lifting top seat 35 and the socket head 36, and can offset the angle generated by the rotation of the components of the speed regulator around the lever fulcrum 41.

[0063] It can be understood that the above embodiments only express the preferred implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the patent scope of the present invention. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the present invention, the above technical features can be freely combined, and several deformations and improvements can be made, all of which fall within the scope of protection of the present invention. Therefore, all equivalent changes and modifications made to the scope of the claims of the present invention should fall within the scope of coverage of the claims of the present invention.

Claims

1. A pneumatic pump overspeed test device, characterized in that: It comprises a driving mechanism (1), a transmission mechanism (2) and a lifting mechanism (3); The driving mechanism (1) is used to provide rotational power, and the driving mechanism is a servo motor; One end of the transmission mechanism (2) is drivingly connected to the drive mechanism (1), and the other end thereof is drivingly connected to the lifting mechanism (3). The transmission mechanism (2) transmits the torque provided by the drive mechanism (1) to the lifting mechanism (3). The lifting mechanism (3) is used to convert the torque into power for linear motion and transmit it to the speed regulator of the pneumatic pump (4), so as to drive the speed regulator driving rod of the pneumatic pump (4) to move upward, thereby causing the valve core of the stop valve to move downward. The lifting mechanism (3) includes a lifting top seat (35) and a socket head (36), wherein the socket head (36) is used to connect to the speed regulator of the pneumatic pump (4), and the lifting top seat (35) is connected to the socket head (36) via a positioning component (37); The positioning assembly (37) includes a cotter pin (371) and a connecting pin (372) provided at one end of the cotter pin (371); a through pin hole (3171) for installing the connecting pin (372) is provided at one end of the cotter pin (371); The top of the lifting seat (35) is provided with a first connecting portion (351), and the bottom of the socket head (36) is provided with a second connecting portion (361). The first connecting portion (351) is provided with a first positioning hole (3511), and the second connecting portion (361) is provided with a second positioning hole (3611). The cotter pin (371) is passed through the first positioning hole (3511) and the second positioning hole (3611) to connect the lifting seat (35) and the socket head (36) together. The second connecting portion (361) is placed in the first connecting portion (351), and there is a predetermined gap between the second connecting portion (361) and the first connecting portion (351) so that a movable connection is formed between the lifting seat (35) and the socket head (36).

2. The pneumatic pump overspeed test device according to claim 1, characterized in that: The transmission mechanism (2) includes a transmission assembly connected to the drive mechanism (1) and a reduction assembly connected to the transmission assembly, the reduction assembly including a first reduction shaft (25), a reduction transmission member (27) transmission-connected to the first reduction shaft (25), and a second reduction shaft (29) coaxially connected to the reduction transmission member (27); The first reduction shaft (25) is used to transmit the rotational power of the transmission assembly to the second reduction shaft (29) via the reduction transmission member (27); The second deceleration shaft (29) is connected to the lifting mechanism (3), thereby transmitting the rotational power provided by the deceleration transmission member (27) to the lifting mechanism (3), so that the lifting mechanism (3) can move in the height direction; The first reduction shaft (25) is a worm shaft, the reduction transmission member (27) is a worm wheel, and the second reduction shaft (29) is a screw shaft.

3. The pneumatic pump overspeed test device according to claim 2, characterized in that: The lifting mechanism (3) includes a first transmission block (31) and a second transmission block (32) which are relatively arranged on both sides of the second reduction shaft (29), the first transmission block (31) and the second transmission block (32) are both movably connected to the second reduction shaft (29), and the first transmission block (31) and the second transmission block (32) are symmetrically arranged; The first transmission block (31) is hinged to a first connecting rod (311) and a second connecting rod (312) on the upper and lower sides, respectively; the second transmission block (32) is hinged to a third connecting rod (321) and a fourth connecting rod (322) on the upper and lower sides, respectively; The first connecting rod (311), the second connecting rod (312), the third connecting rod (321), and the fourth connecting rod (322) together form a parallelogram structure.

4. The pneumatic pump overspeed test device according to claim 3, characterized in that: The transmission assembly comprises a transmission coupling (21) connected to the drive mechanism (1) and a telescopic transmission rod (22); the telescopic transmission rod (22) is connected to the transmission coupling (21) via a first universal joint (26); The first reduction shaft (25) is connected to the other end of the telescopic transmission rod (22) via a second universal joint (28).

5. The pneumatic pump overspeed test device according to claim 3, characterized in that: The pneumatic pump overspeed test device further comprises a transmission box assembly (5), wherein the transmission box assembly (5) comprises a transmission box housing (51), a second reduction bearing (52) and a first reduction bearing (53) provided on the transmission box housing (51); The second deceleration bearing (52) is sleeved on the outer circumference of the second deceleration shaft (29), and the first deceleration bearing (53) is sleeved on the outer circumference of the first deceleration shaft (25).

6. The pneumatic pump overspeed test device according to claim 5, characterized in that: The lifting mechanism (3) further includes a lifting base (33) and a guide column (34) provided on the lifting base (33); The lifting base (33) is hinged to the second connecting rod (312) and the fourth connecting rod (322) at the same time, and a guide groove (331) for installing the guide column (34) is provided at the top thereof, the bottom end of the guide column (34) is slidably placed in the guide groove (331), and the top end thereof is fixedly connected to the transmission box housing (51); or, the lifting base (33) is hinged to the first connecting rod (311) and the third connecting rod (321) at the same time, and a guide groove (331) for installing the guide column (34) is provided at the top thereof, the top end of the guide column (34) is slidably placed in the guide groove (331), and the bottom end thereof is fixedly connected to the transmission box housing (51).

7. The pneumatic pump overspeed test device according to claim 4, characterized in that: The pneumatic pump overspeed test device further includes a support frame (6) and a limit assembly (7); the driving mechanism (1) is fixed to the support frame (6); The limiting assembly (7) comprises a fixing seat (71) provided on the support frame (6), and a coupling bearing (72) provided on the fixing seat (71), wherein the coupling bearing (72) is sleeved on the outer periphery of the transmission coupling (21).

8. The pneumatic pump overspeed test device according to claim 7, characterized in that: The transmission mechanism (2) further comprises a guide sleeve (251) sleeved on the outer periphery of the first deceleration shaft (25), the guide sleeve (251) being arranged on a side of the support frame (6) close to the lifting mechanism (3), and the guide sleeve (251) being movable on the support frame (6) along the height direction of the lifting mechanism (3) to achieve a guiding and supporting function when the first deceleration shaft (25) is raised or lowered.

9. The pneumatic pump overspeed test device according to claim 6, characterized in that: The lifting top seat (35) is hinged to the first connecting rod (311) and the third connecting rod (321) at the same time.

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