A stress testing platform

Abstract

The present invention relates to the field of pressure testing technology, and specifically discloses a pressure testing platform, including: a base and a pressure cylinder, the pressure cylinder is arranged on the right side of the top of the base, air holes connected to its inner cavity are opened on the left and right sides of the top of the pressure cylinder, pressure relief cylinders connected to its inner cavity are arranged on the left and right ends of the front side of the pressure cylinder, and a plurality of pressure relief holes connected to its inner cavity are opened along the circumferential direction on the left side of the outer wall of the pressure relief cylinder; one end of the air pipe is arranged on the outer wall of the air hole; and a mounting seat is arranged on the other end of the air pipe. This device avoids the operational complexity and failure risk brought by the traditional separate pressure source configuration by optimizing the pressure application method of the pressure testing platform, reduces maintenance costs and downtime, thereby ensuring the long-term stable operation of the differential pressure transmitter in the industrial automation system, improving the accuracy and reliability of the overall control system, and helping enterprises to optimize cost control while ensuring production quality.

Description

Technical Field

[0001] The present invention relates to the technical field of pressure testing, and in particular to a pressure testing platform. Background Art

[0002] In the field of industrial automation and process control, differential pressure transmitters, as core instrument components, play a vital role. With their high precision, wide range, and stable and reliable characteristics, they are widely used in industries such as petroleum, chemical, water treatment, pharmaceutical, and food processing. They are used to accurately measure the pressure difference between fluids or gases in pipelines or containers, and convert this difference into a standard electrical signal for further analysis and processing by the control system.

[0003] The differential pressure transmitter integrates precise sensors and signal processing circuits, which can sense and quantify the tiny pressure difference between two pressure points. Its measurement range is wide, supporting the differential pressure measurement from positive pressure to positive pressure, positive pressure to negative pressure, and even between two negative pressure points, showing a high degree of flexibility and adaptability. This feature makes the differential pressure transmitter a key tool for monitoring changes in parameters such as liquid level, flow, density, and filter blockage status;

[0004] In view of the importance of differential pressure transmitters in industrial automation systems, regular performance verification and calibration have become indispensable. The differential pressure transmitter pressure test platform came into being. Its main purpose is to simulate actual working conditions and conduct comprehensive performance testing and calibration of differential pressure transmitters. By precisely controlling and applying different pressures, the platform can verify the measurement accuracy, stability and response speed of the differential pressure transmitter, ensuring that its output signal accurately reflects the actual pressure difference of the measured medium, thereby ensuring the accuracy and reliability of the entire control system.

[0005] However, the differential pressure transmitter pressure test platform currently on the market has obvious limitations in the pressure application method. Traditional platforms often use a separate pressure source configuration, that is, a vacuum pump or vacuum tank is used to generate negative pressure, while positive pressure relies on an air pump or compressor. This design not only increases the complexity and cost of the system, but also leads to operational inconvenience and low efficiency. Specifically, whenever the test needs to be switched between positive and negative pressure, the operator must manually replace the connection equipment. This process is not only time-consuming and labor-intensive, but may also introduce errors due to improper operation, affecting the accuracy of the test results.

[0006] What is more serious is that frequent equipment replacement and complex operating procedures increase the possibility of failures, such as loose interfaces and leakage, which may directly affect the reliability of the test results and even damage the differential pressure transmitter itself. In addition, long-term reliance on multiple independent devices to work together also increases maintenance costs and downtime, which is not conducive to the company's production efficiency and cost control. Summary of the invention

[0007] The purpose of the present invention is to solve the technical problems of inconvenient operation, low efficiency and increased production cost in the prior art, and to propose a pressure testing platform.

[0008] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a pressure testing platform, comprising: a base and a pressure cylinder, the pressure cylinder is arranged on the right side of the top of the base, the left and right sides of the top of the pressure cylinder are provided with air holes connected to its inner cavity, the left and right ends of the front side of the pressure cylinder are provided with pressure relief cylinders connected to its inner cavity, and the left side of the outer wall of the pressure relief cylinder is provided with a plurality of pressure relief holes connected to its inner cavity along the circumferential direction; one end of the air pipe is arranged on the outer wall of the air hole; the mounting seat is arranged on the other end of the air pipe; the differential pressure transmitter is placed on the top of the base, and the two mounting seats are respectively screwed to the front and rear ends of the right side of the differential pressure transmitter, and the inner cavity of the air pipe is connected to the inner cavity of the differential pressure transmitter; the first screw is screwed to the right side of the pressure relief cylinder; the right side of the first piston is arranged at the left end of the first screw, and the first piston can be slidably adapted to be inserted into the left side of the inner cavity of the pressure relief cylinder, and the pressure relief hole is located on the right side of the first piston; the pressure-applying mechanism is arranged in the inner cavity of the pressure cylinder; the fine-tuning mechanism is arranged in the inner cavity of the pressure cylinder.

[0009] Furthermore, in order to apply pressure to the differential pressure transmitter, the pressure-applying mechanism includes: a hydraulic cylinder, wherein there are two hydraulic cylinders, and the two hydraulic cylinders are respectively arranged at the front and rear ends of the right side of the top end of the base, and the inner ends of the two hydraulic cylinders can be slidably extended to the front and rear sides of the inner cavity of the pressure cylinder; a push plate is arranged at the inner end of the hydraulic cylinder, and the push plate is located in the inner cavity of the pressure cylinder; there are several first connecting rods, and one ends of several first connecting rods are respectively arranged on the inner side of the push plate at equal distances along the circumferential direction; the connecting plate can be slidably sleeved on the outer wall of the first connecting rod; there are several second connecting rods, and one ends of several second connecting rods are respectively arranged on the inner side of the connecting plate at equal distances along the circumferential direction; the outer side of the extrusion plate is arranged at the other end of the first connecting rod, and the extrusion plate can be slidably sleeved on the outer wall of the second connecting rod; the outer side of the second piston is arranged at the other end of the second connecting rod, and the second piston can be slidably adapted and inserted into the inner cavity of the pressure cylinder.

[0010] Furthermore, in order to monitor the pressure value, the pressure-applying mechanism further includes: a first pressure sensor, which is arranged on the inner side of the connecting plate; and a second pressure sensor which is arranged on the outer side of the second piston.

[0011] Furthermore, there are gaps between the extrusion plate and both the first pressure sensor and the second pressure sensor.

[0012] Furthermore, in order to fine-tune the pressure, the fine-tuning mechanism includes: a support plate, the number of the support plates is two, and the two support plates are respectively arranged on the front and rear sides of the bottom end of the inner cavity of the pressure cylinder; the number of the second screws is two, and the inner sides of the outer walls of the two second screws are rotatably arranged in the inner cavities of the two support plates through bearings; the worm gear is sleeved on the inner side of the outer wall of the second screw and locked by a top screw; the number of the worm gears is two, and the left ends of the two worm gears are rotatably arranged on the left side of the inner cavity of the pressure cylinder through bearings, and the right ends of the worm gears are rotatably extended out of the right side of the pressure cylinder, and the two worm gears are respectively meshed with the two worm gears; the number of the limit plates There are two limit plates, which are respectively arranged on the front and rear sides of the bottom end of the inner cavity of the pressure cylinder, and the outer end of the worm passes through the inner cavity of the limit plate; there are several limit sliders, which are respectively arranged in the inner cavities of the two limit plates at equal distances along the circumferential direction; the telescopic cylinder can be slidably adapted and inserted in the inner cavity of the limit plate, and the outer wall of the telescopic cylinder is provided with several limit sliding grooves at equal distances along the circumferential direction, and the limit sliding grooves can be slidably adapted and inserted in the inner cavity of the limit sliding grooves, and the inner cavities of the two telescopic cylinders are respectively screwed to the outer walls of the two second screws; the third piston is arranged at the outer end of the telescopic cylinder, and the third piston can be slidably adapted and inserted in the inner cavity of the pressure cylinder.

[0013] Furthermore, a baffle is arranged in the inner cavity of the pressure cylinder. The number of the baffles is four, and the four baffles form a group of two. The two groups of baffles are respectively arranged on the front and rear sides of the inner cavity of the pressure cylinder.

[0014] Furthermore, the air hole and the pressure relief cylinder are respectively located between two baffles in each group, and the two third pistons are both located between the two groups of baffles.

[0015] Furthermore, the distance between the right side of the first piston and the right side of the inner cavity of the pressure relief cylinder is greater than the distance between the left side of the first piston and the pressure relief hole.

[0016] Furthermore, by rotating the worm, the rotational force generated by the rotation of the worm causes the worm wheel to drive the second screw to rotate, and the rotational force generated by the rotation of the second screw causes the telescopic cylinder to drive the third piston to move, thereby adjusting the pressure value between the second piston and the third piston.

[0017] Furthermore, the hydraulic cylinder pushes the push plate to move inward along the inner cavity of the pressure cylinder. The push plate moves inward and pushes the extrusion plate to move inward through the first connecting rod. The extrusion plate squeezes the second pressure sensor, which can push the second piston to move inward along the inner cavity of the pressure cylinder, thereby squeezing the air between the second piston and the third piston, causing the pressure to increase.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] (1) The present invention places a differential pressure transmitter on a base, and starts a hydraulic cylinder to push a push plate to move inward. The push plate pushes an extrusion plate to move through a first connecting rod, so that the extrusion plate can push the second piston to move inward along the inner cavity of the pressure cylinder, thereby compressing the air between the second piston and the third piston, causing the pressure to increase. The pressure between the second piston and the third piston can be detected by a second pressure sensor, and the compressed pressure can be transported to the inner cavity of the differential pressure transmitter through an air pipe.

[0020] (2) The present invention causes the worm wheel to drive the second screw to rotate by rotating the worm, and the rotational force generated by the rotation of the second screw can cause the telescopic cylinder to drive the third piston to move, thereby achieving a slight adjustment of the pressure between the second piston and the third piston, thereby ensuring accurate measurement.

[0021] (3) This device avoids the operational complexity and failure risks brought about by the traditional separate pressure source configuration by optimizing the pressure application method of the pressure test platform, reduces maintenance costs and downtime, thereby ensuring the long-term stable operation of the differential pressure transmitter in the industrial automation system, and improving the accuracy and reliability of the overall control system, which is beneficial for enterprises to optimize cost control while ensuring production quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0023] Figure 1 It is a schematic diagram of the structure of the present invention;

[0024] Figure 2 An exploded view of the present invention;

[0025] Figure 3 It is a schematic diagram of the structure of the inner cavity of the pressure cylinder;

[0026] Figure 4 It is a structural diagram of the fine-tuning mechanism;

[0027] Figure 5 is a structural schematic diagram of a pressure-applying mechanism;

[0028] Figure 6 This is an exploded view of the fine-tuning mechanism;

[0029] Figure 7 This is an exploded view of the pressure mechanism;

[0030] Figure 8 is a schematic structural diagram of a second pressure sensor;

[0031] Fig. 9 for Figure 3 A magnified image of point A;

[0032] Fig.10 for Figure 7 Enlarged view of point B.

[0033] The list of parts represented by each number in the figure is as follows: 1. Base; 2. Pressure cylinder; 3. Air hole; 4. Pressure relief cylinder; 5. Pressure relief hole; 6. Air pipe; 7. Mounting seat; 8. Pressure mechanism; 81. Hydraulic cylinder; 82. Push plate; 83. First connecting rod; 84. Connecting plate; 85. Second connecting rod; 86. Extrusion plate; 87. Second piston; 88. First pressure sensor; 89. Second pressure sensor; 9. Fine-tuning mechanism; 91. Support plate; 92. Second screw; 93. Worm gear; 94. Worm; 95. Limit plate; 96. Limit slider; 97. Telescopic cylinder; 98. Limit slide groove; 99. Third piston; 10. Differential pressure transmitter; 11. First screw; 12. First piston; 13. Baffle. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0036] Reference Figure 1-Figure 10A pressure test platform includes: a base 1, a pressure cylinder 2, an air hole 3, a pressure relief cylinder 4, a pressure relief hole 5, an air pipe 6, a mounting seat 7, a pressure applying mechanism 8, a fine adjustment mechanism 9, a differential pressure transmitter 10, a first screw 11, a first piston 12 and a baffle 13. The pressure cylinder 2 is arranged on the right side of the top of the base 1. The air holes 3 connected to the inner cavity of the pressure cylinder 2 are opened on both the left and right sides of the top of the pressure cylinder 2. The pressure relief cylinder 4 connected to the inner cavity is arranged on both the left and right ends of the front side of the pressure cylinder 2. The outer wall of the pressure relief cylinder 4 is provided with a plurality of holes connected to the inner cavity along the circumferential direction. The pressure relief hole 5 is connected, one end of the air pipe 6 is arranged on the outer wall of the air hole 3, and the inner cavity of the pressure cylinder 2 and the inner cavity of the differential pressure transmitter 10 can be connected through the air pipe 6. The mounting seat 7 is arranged at the other end of the air pipe 6, and the air pipe 6 and the differential pressure transmitter 10 can be fixedly connected through the mounting seat 7. The differential pressure transmitter 10 is placed on the top of the base 1, and the two mounting seats 7 are respectively screwed to the front and rear ends of the right side of the differential pressure transmitter 10. The inner cavity of the air pipe 6 and the inner cavity of the differential pressure transmitter 10 are connected. The differential pressure transmitter 10 is a prior art and will not be described in detail here. The first screw 11 is screwed to the right side of the pressure relief cylinder 4. The rotational force generated by the rotation of the first screw 11 can cause the first piston 12 to move along the inner cavity of the pressure relief cylinder 4. The right side of the first piston 12 is arranged at the left end of the first screw 11. The first piston 12 can be slidably adapted and plugged into the left side of the inner cavity of the pressure relief cylinder 4. The pressure relief hole 5 is located on the right side of the first piston 12. The pressure relief hole 5 and the inner cavity of the pressure cylinder 2 can be separated by the first piston 12. The distance between the right side of the first piston 12 and the right side of the inner cavity of the pressure relief cylinder 4 is greater than the distance between the first piston 12 and the right side of the inner cavity of the pressure relief cylinder 4. The distance from the left side to the pressure relief hole 5 ensures that the pressure relief hole 5 and the inner cavity of the pressure cylinder 2 can be connected. The pressure-applying mechanism 8 is arranged in the inner cavity of the pressure cylinder 2. The pressure-applying mechanism 8 can deliver pressure to the inner cavity of the differential pressure transmitter 10. The fine-tuning mechanism 9 is arranged in the inner cavity of the pressure cylinder 2. The fine-tuning mechanism 9 is used to fine-tune the pressure delivered to the differential pressure transmitter 10. There are four baffles 13, and the four baffles 13 are grouped in pairs. The two groups of baffles 13 are respectively arranged on the front and rear sides of the inner cavity of the pressure cylinder 2, and the air hole 3 and the pressure relief cylinder 4 are respectively located between the two baffles 13 in each group.

[0037] Specifically, the pressure mechanism 8 includes: a hydraulic cylinder 81, a push plate 82, a first connecting rod 83, a connecting plate 84, a second connecting rod 85, an extrusion plate 86, a second piston 87, a first pressure sensor 88, and a second pressure sensor 89. There are two hydraulic cylinders 81, and the two hydraulic cylinders 81 are respectively arranged at the front and rear ends of the top right side of the base 1. The inner ends of the two hydraulic cylinders 81 can be slidably extended to the front and rear sides of the inner cavity of the pressure cylinder 2. The hydraulic cylinder 81 is a prior art and will not be described in detail here. The hydraulic cylinder 81 is This is used to push the push plate 82 to move. The push plate 82 is arranged at the inner end of the hydraulic cylinder 81. The push plate 82 is located in the inner cavity of the pressure cylinder 2. The movement of the push plate 82 can drive the extrusion plate 86 to move through the first connecting rod 83. The number of the first connecting rods 83 is several, and one end of the several first connecting rods 83 is respectively arranged on the inner side of the push plate 82 at equal distances along the circumferential direction. The connecting plate 84 can be slidably sleeved on the outer wall of the first connecting rod 83. The connecting plate 84 is used to cover the extrusion plate 86. The number of the second connecting rods 85 is several One end of a plurality of second connecting rods 85 is respectively arranged on the inner side of the connecting plate 84 at equal intervals along the circumferential direction, the outer side of the extrusion plate 86 is arranged on the other end of the first connecting rod 83, the extrusion plate 86 can be slidably sleeved on the outer wall of the second connecting rod 85, the extrusion plate 86 is used to drive the second piston 87 to move and squeeze the first pressure sensor 88 and the second pressure sensor 89, the outer side of the second piston 87 is arranged on the other end of the second connecting rod 85, the second piston 87 can be slidably adapted and inserted into the inner cavity of the pressure cylinder 2, the first pressure sensor 88 is arranged on the inner side of the connecting plate 84, the pressure value between the second piston 87 and the third piston 99 can be detected by squeezing the first pressure sensor 88 by the squeezing plate 86, and there is a gap between the squeezing plate 86 and the first pressure sensor 88, the second pressure sensor 89 is arranged on the outer side of the second piston 87, the pressure value between the second piston 87 and the third piston 99 can be detected by squeezing the second pressure sensor 89 by the squeezing plate 86, and there is a gap between the squeezing plate 86 and the second pressure sensor 89.

[0038] Specifically, the fine-tuning mechanism 9 includes: a support plate 91, a second screw 92, a worm wheel 93, a worm 94, a limit plate 95, a limit slider 96, a telescopic cylinder 97, a limit slide groove 98 and a third piston 99. The number of the support plates 91 is two, and the two support plates 91 are respectively arranged at the front and rear sides of the bottom end of the inner cavity of the pressure cylinder 2. The support plates 91 are used to support the second screw 92. The number of the second screw 92 is two, and the inner sides of the outer walls of the two second screws 92 are rotatably arranged on the two support plates 91 through bearings. The inner cavity of the pressure cylinder 2, the rotational force generated by the rotation of the second screw 92 can prompt the telescopic cylinder 97 to drive the third piston 99 to move, the worm wheel 93 is sleeved on the inner side of the outer wall of the second screw 92 and locked by a top screw, the number of worms 94 is two, the left ends of the two worms 94 are rotatably arranged on the left side of the inner cavity of the pressure cylinder 2 through bearings, and the right ends of the worms 94 are rotatably extended out of the right side of the pressure cylinder 2, the two worms 94 are respectively meshed with the two worm wheels 93, the number of limit plates 95 is two, and the two limit plates 95 are respectively arranged on the front and rear sides of the bottom end of the inner cavity of the pressure cylinder 2, the outer end of the worm 94 penetrates the inner cavity of the limit plate 95, the number of the limit sliders 96 is several, and the limit sliders 96 are respectively arranged in the inner cavities of the two limit plates 95 at equal distances along the circumferential direction, and the limit sliders 96 and the limit slide grooves 98 can cooperate to limit the telescopic cylinder 97 to prevent the telescopic cylinder 97 from rotating with the second screw 92, and the telescopic cylinder 97 can be slidably adapted to be plugged into the inner cavity of the limit plate 95, and the outer wall of the telescopic cylinder 97 is equidistant along the circumferential direction. A plurality of limit slots 98 are provided, and the limit slider 96 can be slidably adapted and inserted into the inner cavity of the limit slot 98. The inner cavities of the two telescopic cylinders 97 are respectively screwed to the outer walls of the two second screw rods 92. The third piston 99 is arranged at the outer end of the telescopic cylinder 97. The third piston 99 can be slidably adapted and inserted into the inner cavity of the pressure cylinder 2. The third piston 99 moves along the inner cavity of the pressure cylinder 2 to change the pressure value between the second piston 87 and the third piston 99. The two third pistons 99 are both located between the two sets of baffles 13.

[0039] In the present invention, when in use, the air pipe 6 is fixed on the differential pressure transmitter 10 through the mounting seat 7, and the air pipe 6 and the inner cavity of the differential pressure transmitter 10 are connected. If positive pressure needs to be applied to the differential pressure transmitter 10, the hydraulic cylinder 81 is started, and the hydraulic cylinder 81 pushes the push plate 82 to move inward along the inner cavity of the pressure cylinder 2. The push plate 82 moves inward and can push the extrusion plate 86 to move inward through the first connecting rod 83 until the extrusion plate 86 contacts the second pressure sensor 89, so that the second piston 87 can be pushed to move inward along the inner cavity of the pressure cylinder 2 by squeezing the second pressure sensor 89 through the squeezing plate 86, thereby squeezing the air between the second piston 87 and the third piston 99, causing the pressure to increase, and the pressure is read through the second pressure sensor 89. If the pressure needs to be fine-tuned, the worm 94 is rotated. The rotational force generated by the rotation of the worm 94 can prompt the worm wheel 93 to drive the second screw 92 to rotate. The rotational force generated by the rotation of the second screw 92 can prompt the telescopic cylinder 97 to drive the third piston 99 to move, so that the pressure value between the second piston 87 and the third piston 99 can be fine-tuned until the pressure value read by the second pressure sensor 89 reaches a suitable value. The pressure between the second piston 87 and the third piston 99 can be transmitted to the differential pressure transmitter 10 through the air pipe 6. By comparing the value displayed by the differential pressure transmitter 10 with the value read by the second pressure sensor 89, the differential pressure transmitter 10 can be tested. After the test is completed, the movement in the opposite direction to the above can be performed;

[0040] When negative pressure needs to be applied to the differential pressure transmitter 10, the first screw 11 is rotated, and the rotation of the first screw 11 can drive the first piston 12 to move outward until the pressure relief hole 5 and the inner cavity of the pressure cylinder 2 are connected, and the hydraulic cylinder 81 is started, and the hydraulic cylinder 81 pushes the push plate 82 to move inward, thereby pushing the second piston 87 to move inward until the second piston 87 and the baffle 13 are in contact, and the first screw 11 is rotated in the opposite direction until the first piston 12 returns to its initial position, and the hydraulic cylinder 81 is started to pull the push plate 82 to move outward, so that the push plate 82 is used to push the first connecting rod 82 to move outward. 83 pulls the extrusion plate 86 to move outward until the extrusion plate 86 contacts the first pressure sensor 88. The extrusion plate 86 is used to squeeze the first pressure sensor 88 to pull the connecting plate 84 to move outward. The connecting plate 84 moves outward, and the second piston 87 can be pulled outward through the second connecting rod 85, thereby causing negative pressure to be generated between the second piston 87 and the third piston 99. The negative pressure value between the second piston 87 and the third piston 99 can be detected by reading the value of the first pressure sensor 88, so that negative pressure can be applied to the differential pressure transmitter 10.

[0041] To sum up, the present invention avoids the operational complexity and failure risks brought about by the traditional separate pressure source configuration by optimizing the pressure application method of the pressure testing platform, reduces maintenance costs and downtime, thereby ensuring the long-term stable operation of the differential pressure transmitter in the industrial automation system, and improving the accuracy and reliability of the overall control system, which is beneficial for enterprises to optimize cost control while ensuring production quality.

[0042] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A pressure testing platform, characterized in that: include: Base (1); A pressure cylinder (2), the pressure cylinder (2) being arranged on the right side of the top end of the base (1), the top end of the pressure cylinder (2) being provided with air holes (3) in communication with its inner cavity on both left and right sides, the front end of the pressure cylinder (2) being provided with pressure relief cylinders (4) in communication with its inner cavity on both left and right ends, and the outer wall of the pressure relief cylinder (4) being provided with a plurality of pressure relief holes (5) in communication with its inner cavity along the circumferential direction on the left side; An air pipe (6), one end of the air pipe (6) being arranged on the outer wall of the air hole (3); A mounting seat (7), the mounting seat (7) being arranged at the other end of the air pipe (6); A differential pressure transmitter (10), the differential pressure transmitter (10) being placed on the top of the base (1), the two mounting seats (7) being respectively screwed to the front and rear ends of the right side of the differential pressure transmitter (10), and the inner cavity of the air pipe (6) being connected to the inner cavity of the differential pressure transmitter (10); A first screw rod (11), the first screw rod (11) being screwed to the right side of the pressure relief cylinder (4); A first piston (12), the right side of the first piston (12) being arranged at the left end of the first screw rod (11), the first piston (12) being slidably adapted to be plugged into the left side of the inner cavity of the pressure relief cylinder (4), and the pressure relief hole (5) being located at the right side of the first piston (12); A pressure-applying mechanism (8), wherein the pressure-applying mechanism (8) is arranged in the inner cavity of the pressure cylinder (2); A fine-tuning mechanism (9), wherein the fine-tuning mechanism (9) is arranged in the inner cavity of the pressure cylinder (2); The pressure applying mechanism (8) comprises: A hydraulic cylinder (81), wherein the number of the hydraulic cylinders (81) is two, and the two hydraulic cylinders (81) are respectively arranged at the front and rear ends of the right side of the top end of the base (1), and the inner ends of the two hydraulic cylinders (81) are respectively slidably extended to the front and rear sides of the inner cavity of the pressure cylinder (2); A push plate (82), the push plate (82) being arranged at the inner end of the hydraulic cylinder (81), the push plate (82) being located in the inner cavity of the pressure cylinder (2); A first connecting rod (83), wherein the number of the first connecting rods (83) is a plurality, and one end of the plurality of first connecting rods (83) is respectively arranged at equal distances along the circumferential direction on the inner side of the push plate (82); A connecting plate (84), wherein the connecting plate (84) is slidably sleeved on an outer wall of the first connecting rod (83); Second connecting rods (85), the number of the second connecting rods (85) being multiple, and one ends of the multiple second connecting rods (85) being respectively arranged at equal distances along the circumferential direction on the inner side of the connecting plate (84); An extrusion plate (86), the outer side of the extrusion plate (86) being arranged at the other end of the first connecting rod (83), and the extrusion plate (86) being slidably sleeved on the outer wall of the second connecting rod (85); a second piston (87), the outer side of the second piston (87) being arranged at the other end of the second connecting rod (85), and the second piston (87) being slidably adapted to be inserted into the inner cavity of the pressure cylinder (2); A first pressure sensor (88), the first pressure sensor (88) being arranged on the inner side of the connecting plate (84); a second pressure sensor (89), the second pressure sensor (89) being arranged outside the second piston (87); The fine-tuning mechanism (9) comprises: A support plate (91), wherein the number of the support plates (91) is two, and the two support plates (91) are respectively arranged at the front and rear sides of the bottom end of the inner cavity of the pressure cylinder (2); A second screw rod (92), the number of the second screw rod (92) being two, and the inner sides of the outer walls of the two second screw rods (92) are rotatably arranged in the inner cavities of the two support plates (91) via bearings; A worm wheel (93), the worm wheel (93) being sleeved on the inner side of the outer wall of the second screw rod (92) and being locked by a top screw; A worm (94), wherein the number of the worm (94) is two, the left ends of the two worms (94) are rotatably arranged on the left side of the inner cavity of the pressure cylinder (2) through bearings, and the right ends of the worms (94) are rotatably extended out of the right side of the pressure cylinder (2), and the two worms (94) are respectively meshed with two worm wheels (93); a limiting plate (95), wherein the limiting plates (95) are provided in two numbers, and the two limiting plates (95) are respectively arranged at the front and rear sides of the bottom end of the inner cavity of the pressure cylinder (2), and the outer end of the worm (94) passes through the inner cavity of the limiting plate (95); A limiting slider (96), wherein the limiting slider (96) is in a plurality, and the plurality of limiting sliders (96) are respectively arranged in the inner cavities of the two limiting plates (95) at equal intervals along the circumferential direction; A telescopic cylinder (97), the telescopic cylinder (97) being slidably adapted to be inserted into the inner cavity of the limiting plate (95), the outer wall of the telescopic cylinder (97) being provided with a plurality of limiting sliding grooves (98) equidistantly along the circumferential direction, the limiting sliding block (96) being slidably adapted to be inserted into the inner cavity of the limiting sliding grooves (98), and the inner cavities of the two telescopic cylinders (97) being respectively screwed to the outer walls of the two second screw rods (92); A third piston (99) is arranged at the outer end of the telescopic cylinder (97), and the third piston (99) can be slidably adapted to be inserted into the inner cavity of the pressure cylinder (2).

2. A pressure testing platform according to claim 1, characterized in that: There are gaps between the extrusion plate (86) and the first pressure sensor (88) and the second pressure sensor (89).

3. A pressure testing platform according to claim 2, characterized in that: A baffle (13) is arranged in the inner cavity of the pressure cylinder (2), the number of the baffles (13) is four, the four baffles (13) are grouped in pairs, and the two groups of baffles (13) are respectively arranged at the front and rear sides of the inner cavity of the pressure cylinder (2).

4. A pressure testing platform according to claim 3, characterized in that: The air hole (3) and the pressure relief cylinder (4) are respectively located between two baffles (13) in each group, and the two third pistons (99) are both located between the two groups of baffles (13).

5. A pressure testing platform according to claim 4, characterized in that: The distance between the right side of the first piston (12) and the right side of the inner cavity of the pressure relief cylinder (4) is greater than the distance between the left side of the first piston (12) and the pressure relief hole (5).

6. A pressure testing platform according to claim 5, characterized in that: By rotating the worm (94), the rotational force generated by the rotation of the worm (94) causes the worm wheel (93) to drive the second screw (92) to rotate, and the rotational force generated by the rotation of the second screw (92) causes the telescopic cylinder (97) to drive the third piston (99) to move, thereby adjusting the pressure value between the second piston (87) and the third piston (99).

7. A pressure testing platform according to claim 6, characterized in that: The hydraulic cylinder (81) pushes the push plate (82) to move inward along the inner cavity of the pressure cylinder (2). The push plate (82) moves inward and pushes the extrusion plate (86) to move inward through the first connecting rod (83). The extrusion plate (86) squeezes the second pressure sensor (89), thereby pushing the second piston (87) to move inward along the inner cavity of the pressure cylinder (2), thereby squeezing the air between the second piston (87) and the third piston (99), thereby increasing the pressure.

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