A high-precision calibration device for mine pressure instruments

Abstract

The utility model relates to pressure instrument technical field, more particularly, relate to a kind of high-precision mine pressure instrument calibration device, including pedestal, fixed on pedestal pressure source and contrast test mechanism.Pressure source output end divides first connecting pipe and second connecting pipe.Contrast test mechanism is equipped with with pedestal fixed contrast test platform, and contrast interface and at least one interface to be measured are arranged on platform.One end of interface to be measured is communicated with first connecting pipe, and the other end is connected with the mine pressure instrument to be calibrated;One end of contrast interface is communicated with second connecting pipe, and the other end is connected with contrast pressure gauge.When calibrating, the calibration pressure generated by pressure source is transmitted synchronously through two independent pipelines.This design ensures that the instrument to be measured and contrast pressure gauge bear completely consistent pressure.Operating personnel directly compares the value error of both, improves detection accuracy, and reduces detection cycle.

Description

Technical Field

[0001] This utility model relates to the field of pressure instrument technology, and more specifically, to a high-precision calibration device for mining pressure instruments. Background Technology

[0002] Mining pressure instruments play a crucial role in the mine safety production system. Their core function is to continuously and accurately monitor various pressure parameters in the complex environment of a mine. Mining activities take place deep underground, facing multiple pressure-related risks, including gas accumulation, groundwater seepage, changes in rock stress, ventilation system regulation, and the hydraulic drive of large machinery. Abnormal fluctuations in these pressure parameters are often precursors to major safety accidents. For example, excessive gas levels can trigger explosions, a surge in roof pressure indicates a risk of roof collapse, insufficient negative pressure in ventilation leads to the accumulation of harmful gases, and loss of pressure in hydraulic supports directly threatens the safety of the working face. Therefore, real-time acquisition of reliable pressure data is a fundamental prerequisite for risk warning, implementation of automatic control, and ensuring the safety of personnel.

[0003] In actual use, pressure instruments in the mine need to be calibrated regularly. Existing pressure instrument calibration equipment has a complex structure, long testing cycle, and low testing accuracy, which can no longer meet the current testing needs of pressure instruments for ore. Utility Model Content

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a high-precision calibration device for mining pressure instruments, aiming to reduce the testing cycle of pressure instruments and improve testing accuracy.

[0005] A high-precision calibration device for mining pressure instruments according to an embodiment of the present invention includes:

[0006] Base;

[0007] A pressure source is fixedly mounted on the base, and the output end of the pressure source is provided with a first connecting pipe and a second connecting pipe.

[0008] The comparative testing mechanism includes a comparative testing platform, which is fixedly connected to the base. The comparative testing platform is provided with a comparative interface and at least one interface to be tested. One end of the interface to be tested is connected to the first connecting pipe, one end of the comparative interface is connected to the second connecting pipe, and the other end of the comparative interface is connected to a comparative pressure gauge.

[0009] According to some embodiments of the present invention, the pressure source includes an adjusting seat and a pressurizing assembly. The pressurizing assembly is provided with a pressure cylinder, a first piston, and a driving rod. The adjusting seat is provided with a first pressure chamber, and the pressure cylinder is provided with a second pressure chamber. The first pressure chamber communicates with the second pressure chamber. The first piston is slidably connected to the pressure cylinder along the axial direction. The driving rod is threadedly connected to the pressure cylinder, and one end of the driving rod passes through the pressure cylinder and is rotatably connected to the first piston.

[0010] According to some embodiments of the present invention, one end of the drive rod is provided with a rotating handle.

[0011] According to some embodiments of the present invention, the pressure source includes a fine-tuning component, which is provided with a fine-tuning cylinder, a second piston, and a fine-tuning rod. The fine-tuning cylinder is provided with a third pressure chamber, which is connected to the first pressure chamber. The second piston is slidably connected to the fine-tuning cylinder along the axial direction. The fine-tuning rod is threadedly connected to the fine-tuning cylinder, and one end of the fine-tuning rod passes through the fine-tuning cylinder and is rotatably connected to the first piston.

[0012] According to some embodiments of this utility model, a knob is provided at one end of the fine-tuning rod.

[0013] According to some embodiments of the present invention, the pressure source includes a rapid pressurization assembly, which is provided with a pressurization cylinder, a third piston, and a pressurization rod. The pressurization cylinder is provided with a fourth pressure chamber, which is connected to the first pressure chamber. The third piston is slidably connected to the pressurization cylinder along the axial direction. The pressurization rod is fixedly connected to the pressurization cylinder, and one end of the pressurization rod passes through the pressurization cylinder and is fixedly connected to the third piston.

[0014] According to some embodiments of the present invention, the pressurizing assembly includes a driving swing rod, one end of which is rotatably connected to the pressurizing cylinder. A sliding groove is provided on the driving swing rod, and the upper end of the pressurizing rod is slidably disposed in the sliding groove. A return spring is provided between the pressurizing rod and the pressurizing cylinder.

[0015] According to some embodiments of the present invention, a first connecting rod and a second connecting rod are respectively provided on both sides of the adjusting seat. A first three-way valve is provided at the end of the first connecting rod, and the first three-way valve is connected to the first connecting pipe. A second three-way valve is provided at the end of the second connecting rod, and the second three-way valve is connected to the second connecting pipe.

[0016] According to some embodiments of the present invention, the comparison test stand is provided with a first pressure relief port and a second pressure relief port, the first pressure relief port being connected to the first connecting pipe, and the second pressure relief port being connected to the second connecting pipe.

[0017] According to some embodiments of this utility model, the comparison pressure gauge is an electronic pressure gauge, and the accuracy of the electronic pressure gauge is D, wherein -0.05%FS≤D≤0.05%FS.

[0018] A high-precision calibration device for mining pressure instruments according to an embodiment of the present invention has at least the following beneficial effects:

[0019] According to the present invention, a high-precision mining pressure instrument calibration device includes a base, a pressure source, and a comparison testing mechanism. The pressure source is fixedly mounted on the base, and its output end is equipped with a first connecting pipe and a second connecting pipe. The comparison testing mechanism includes a comparison testing platform, which is fixedly connected to the base. The comparison testing platform has a comparison interface and at least one interface to be tested. One end of the interface to be tested is connected to the first connecting pipe, one end of the comparison interface is connected to the second connecting pipe, and the other end of the comparison interface is connected to a comparison pressure gauge. Specifically, in this invention, when the device is started, the pressure instrument to be tested is connected to the interface to be tested. A controllable calibration pressure is generated by the pressure source, and this pressure is split into two independent pipelines through its output end: the first connecting pipe directly delivers the pressure medium to the interface to be tested on the comparison testing platform, and the other end of the interface to be tested is connected to the pressure instrument to be calibrated; simultaneously, the second connecting pipe synchronously delivers a completely identical pressure medium to the comparison interface on the comparison testing platform, and the other end of the comparison interface is connected to a comparison pressure gauge with known accuracy. This design ensures that at any calibration moment, the pressure values ​​experienced by the pressure instrument under test and the comparison pressure gauge are completely identical, both originating directly from the same output state of the pressure source. Operators can intuitively calculate the measurement error of the instrument under test by observing and recording the standard pressure value displayed on the comparison pressure gauge and the reading of the pressure instrument under test. The entire process relies on physical piping to achieve pressure synchronization, eliminating the need for electronic signal conversion or intermediate processing.

[0020] According to the present invention, pressure transmission exhibits excellent synchronization and consistency. Two connecting pipes are led out in parallel from the same pressure source output, eliminating the pressure attenuation or response delay that may exist in traditional series pipelines. This ensures that the pressure received by the calibrated instrument and the standard meter is strictly synchronized in amplitude and time, significantly improving the real-time performance and comparability of calibration data. Secondly, the structural layout is highly integrated and stable. The pressure source and the comparison test stand are rigidly fixed on the same base, forming a stable overall frame. This avoids changes in pipeline stress or loosening of connections due to component displacement, ensuring the sealing and reading stability of the pressure system during calibration. The comparison test stand centrally arranges the comparison interface and multiple test interfaces, supporting simultaneous connection of one standard meter and at least one calibrated instrument. This not only simplifies the operation process and improves calibration efficiency, but is also particularly suitable for rapid batch testing of instruments of the same model, reducing the risk of sealing failure caused by repeated disassembly and reassembly. Furthermore, the entire calibration process relies entirely on mechanical structures for pressure generation, distribution, and display, without the need for any electronic control systems. This reduces the complexity and failure rate of the device and fundamentally eliminates the possibility of electrical sparks, meeting the mandatory requirements for intrinsically safe equipment in the explosive environment of mines. In summary, this device, through its innovative dual-pipeline parallel design and integrated base structure, ensures high-precision pressure synchronization comparison while also possessing strong anti-interference capabilities, convenient and efficient operation, and intrinsic safety, providing a reliable and practical solution for the on-site calibration of mine pressure instruments. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of this utility model;

[0022] Figure 2 This is a schematic diagram of the pressure source of this utility model;

[0023] Figure 3 This is a partial cross-sectional view of the pressure source of this utility model;

[0024] Figure 4 This is a structural schematic diagram from one perspective of the present invention.

[0025] In the picture:

[0026] 100-Base;

[0027] 200-Pressure source, 201-First connecting pipe, 202-Second connecting pipe, 210-Adjusting seat, 211-First pressure chamber, 220-Pressure boosting component, 221-Pressure cylinder, 222-First piston, 223-Drive rod, 224-Second pressure chamber, 225-Rotating handle, 230-Fine adjustment component, 231-Fine adjustment cylinder, 232-Second piston, 233-Fine adjustment rod, 234-Third pressure chamber, 235-Knob, 240-Pressure application component, 241-Pressure application cylinder, 242-Third piston, 243-Pressure application rod, 244-Fourth pressure chamber, 245-Drive swing arm, 246-Reset spring, 250-First connecting rod, 251-First three-way valve, 260-Second connecting rod, 261-Second three-way valve;

[0028] 300 - Comparison test mechanism, 310 - Comparison test bench, 311 - Comparison interface, 312 - Interface to be tested, 320 - Comparison pressure gauge, 330 - First pressure relief port, 340 - Second pressure relief port. Detailed Implementation

[0029] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0030] In the description of this utility model, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0031] In the description of this utility model, "multiple" refers to two or more. The use of "first" and "second" is for distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of technical features or their sequential relationship.

[0032] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0033] Reference Figures 1 to 4As shown, this utility model discloses a high-precision calibration device for mining pressure instruments, which includes a base 100, a pressure source 200, and a comparison testing mechanism 300. The pressure source 200 is fixedly mounted on the base 100, and its output end is provided with a first connecting pipe 201 and a second connecting pipe 202. The comparison testing mechanism 300 includes a comparison testing platform 310, which is fixedly connected to the base 100. The comparison testing platform 310 is provided with a comparison interface 311 and at least one test interface 312. One end of the test interface 312 is connected to the first connecting pipe 201, one end of the comparison interface 311 is connected to the second connecting pipe 202, and the other end of the comparison interface 311 is connected to a comparison pressure gauge 320. Specifically, in this embodiment, when the device is started, the pressure instrument to be tested is connected to the test interface 312. A controllable calibration pressure is generated by the pressure source 200. This pressure is split into two independent pipelines through its output end: the first connecting pipe 201 directly delivers the pressure medium to the test interface 312 on the comparison test stand 310, and the other end of the test interface 312 is connected to the pressure instrument to be calibrated; at the same time, the second connecting pipe 202 synchronously delivers the pressure medium from the same source to the comparison interface 311 on the comparison test stand 310, and the other end of the comparison interface 311 is connected to the comparison pressure gauge 320 with known accuracy. This design ensures that at any calibration time, the pressure values ​​experienced by the pressure instrument to be tested and the comparison pressure gauge 320 are completely consistent, both directly originating from the same output state of the pressure source 200. By observing and recording the standard pressure value displayed by the comparison pressure gauge 320 and the reading of the pressure instrument being calibrated, the operator can intuitively calculate the measurement error of the instrument being calibrated. The entire process relies on physical pipelines to achieve pressure synchronization, without the need for electronic signal conversion or intermediate processing.

[0034] In this embodiment, pressure transmission exhibits excellent synchronization and consistency. Two connecting pipes are led out in parallel from the output of the same pressure source 200, eliminating the pressure attenuation or response delay that may exist in traditional series pipelines. This ensures that the pressure received by the calibrated instrument and the standard meter is strictly synchronized in amplitude and time, significantly improving the real-time performance and comparability of calibration data. Secondly, the structural layout is highly integrated and stable. The pressure source 200 and the comparison test platform 310 are rigidly fixed on the same base 100, forming a stable overall frame. This prevents changes in pipeline stress or loosening of connections due to component displacement, ensuring the sealing and reading stability of the pressure system during calibration. The comparison test platform 310 centrally arranges the comparison interface 311 and multiple test interfaces 312, supporting simultaneous connection of one standard meter and at least one calibrated instrument. This not only simplifies the operation process and improves calibration efficiency, but is also particularly suitable for rapid batch testing of instruments of the same model, reducing the risk of sealing failure caused by repeated disassembly and reassembly. Furthermore, the entire calibration process relies entirely on mechanical structures for pressure generation, distribution, and display, without the need for any electronic control systems. This reduces the complexity and failure rate of the device and fundamentally eliminates the possibility of electrical sparks, meeting the mandatory requirements for intrinsically safe equipment in the explosive environment of mines. In summary, this device, through its innovative dual-pipeline parallel design and integrated 100-inch base structure, ensures high-precision pressure synchronization comparison while also possessing strong anti-interference capabilities, convenient and efficient operation, and intrinsic safety, providing a reliable and practical solution for the on-site calibration of mine pressure instruments.

[0035] In some embodiments of this utility model, the pressure source 200 includes an adjusting seat 210 and a pressurizing assembly 220. The pressurizing assembly 220 is provided with a pressure cylinder 221, a first piston 222, and a drive rod 223. The adjusting seat 210 is provided with a first pressure chamber 211, and the pressure cylinder 221 is provided with a second pressure chamber 224. The first pressure chamber 211 communicates with the second pressure chamber 224. The first piston 222 is slidably connected to the pressure cylinder 221 along the axial direction. The drive rod 223 is threadedly connected to the pressure cylinder 221, and one end of the drive rod 223 passes through the pressure cylinder 221 and is rotatably connected to the first piston 222. Specifically, during operation, when the drive rod 223 is rotated, the threaded engagement between the drive rod 223 and the pressure cylinder 221 generates an axial feed motion. Since the end of the drive rod 223 is rotatably connected to the first piston 222, the first piston 222 slides linearly along the inner wall of the pressure cylinder 221 under the axial thrust of the drive rod 223, avoiding rotational friction. When the first piston 222 pushes into the pressure cylinder 221, it compresses the hydraulic medium in the second pressure chamber 224. The pressure is transmitted to the first pressure chamber 211 of the regulating seat 210 through the connecting pipe, resulting in an increase in system pressure. This device uses a threaded connection to control the piston lead. The operator can precisely control the displacement of the first piston 222 by finely adjusting the rotation angle of the drive rod 223, thereby achieving minute changes in the volume of the second pressure chamber 224 and ultimately achieving high-precision linear regulation of the output pressure. When the drive rod 223 stops rotating, the inherent mechanical self-locking effect of the threaded pair instantly fixes the first piston 222 in its current position, the volume of the second pressure chamber 224 remains constant, and the system pressure automatically maintains a stable state. In this embodiment, the threaded transmission of the drive rod 223 converts the rotation angle into precise piston displacement. Its transmission ratio can be precisely designed according to the pitch, allowing for fine-scale adjustment of pressure through minimal manual operation, fully meeting the pressure resolution requirements for high-precision calibration.

[0036] In some embodiments of this invention, a rotating handle 225 is provided at one end of the drive rod 223. The handle allows the operator to control the rotation of the drive rod 223.

[0037] In some embodiments of this utility model, the pressure source 200 includes a fine-tuning component 230, which is provided with a fine-tuning cylinder 231, a second piston 232 and a fine-tuning rod 233. The fine-tuning cylinder 231 is provided with a third pressure chamber 234, which is connected to the first pressure chamber 211. The second piston 232 is slidably connected to the fine-tuning cylinder 231 along the axial direction. The fine-tuning rod 233 is threadedly connected to the fine-tuning cylinder 231. One end of the fine-tuning rod 233 passes through the fine-tuning cylinder 231 and is rotatably connected to the first piston 222. Specifically, in this embodiment, the operator first establishes the basic pressure using the pressurization component 220. This is achieved by rotating the drive rod 223 to push the first piston 222 to compress the medium in the second pressure chamber 224. The pressure is then transmitted through the connecting pipe to the first pressure chamber 211 of the adjusting seat 210 to form the initial pressure. When the pressure approaches the target calibration point, the fine-tuning component 230 is activated to perform fine adjustment. Rotating the fine-tuning rod 233 drives the second piston 232 to make axial linear displacement within the fine-tuning cylinder 231 through its threaded structure. The movement of the second piston 232 changes the volume of the third pressure chamber 234. Since the third pressure chamber 234 is directly connected to the first pressure chamber 211, this volume change translates into a slight correction to the pressure in the first pressure chamber 211. The thread lead of the fine-tuning rod 233 is significantly smaller than the pitch of the drive rod 223 of the pressurization component 220, resulting in a smaller displacement of the second piston 232 at the same rotation angle, thereby achieving higher resolution pressure regulation. The fine-tuning process also relies on the self-locking characteristics of the threaded pair. Stopping the rotation of the fine-tuning rod 233 instantly locks the position of the second piston 232, ensuring a constant volume of the third pressure chamber 234, thereby maintaining the ultra-steady output pressure of the first pressure chamber 211. Through the design of this structure, the booster assembly 220 is responsible for efficiently establishing a wide range of base pressures, significantly shortening the calibration preparation time; the fine-tuning assembly 230 focuses on fine-tuning the end pressure. The two-stage structure works together to ensure both wide-range pressure coverage and high-resolution adjustment requirements.

[0038] In some embodiments of this utility model, a knob 235 is provided at one end of the fine-tuning lever 233. The knob 235 can assist the operator in controlling the rotation of the fine-tuning lever 233.

[0039] In some embodiments of this utility model, the pressure source 200 includes a rapid pressurization assembly 240, which is provided with a pressurization cylinder 241, a third piston 242, and a pressurization rod 243. The pressurization cylinder 241 is provided with a fourth pressure chamber 244, which is connected to a first pressure chamber 211. The third piston 242 is slidably connected to the pressurization cylinder 241 along the axial direction, and the pressurization rod 243 is fixedly connected to the pressurization cylinder 241. One end of the pressurization rod 243 passes through the pressurization cylinder 241 and is fixedly connected to the third piston 242. In the rapid detection working mode, neither the fine-tuning assembly 230 nor the pressurization assembly 220 works. After the pressure instrument to be tested is placed, the pressure value in the first pressure chamber 211 can be rapidly increased through the rapid pressurization assembly 240, generating instantaneous high pressure, thereby determining whether the pressure instrument to be tested can work. Through the design of this structure, in the rapid detection working mode, the operator directly operates the pressure rod 243. Since the pressure rod 243 is fixedly connected to the pressure cylinder 241 and rigidly linked to the third piston 242, pushing the pressure rod 243 drives the third piston 242 to move axially linearly within the pressure cylinder 241. The third piston 242 compresses the hydraulic medium in the fourth pressure chamber 244. Because the fourth pressure chamber 244 is connected to the first pressure chamber 211 of the adjusting seat 210, the compressed medium transmits pressure to the first pressure chamber 211 without attenuation, causing the pressure value in the first pressure chamber 211 to rise rapidly. At this time, the drive rod 223 of the pressurization component 220 and the first piston 222, and the fine-tuning rod 233 of the fine-tuning component 230 and the second piston 232 all remain stationary. The system relies solely on the rapid pressurization component 240 as a single power source. This design allows the operator to raise the pressure in the first pressure chamber 211 to the target high pressure value in a very short time by pushing the pressure rod 243 in a single large push, thus generating an instantaneous high pressure environment that meets the requirements for rapid detection.

[0040] In some embodiments of this utility model, the pressurizing assembly 240 includes a driving swing rod 245, one end of which is rotatably connected to the pressurizing cylinder 241. A sliding groove is provided on the driving swing rod 245, and the upper end of the pressurizing rod 243 is slidably disposed in the sliding groove. A return spring 246 is provided between the pressurizing rod 243 and the pressurizing cylinder 241. During operation, when the operator presses down the drive lever 245, the drive lever 245 pivots around its rotational connection point with the pressure cylinder 241, and the groove on the drive lever 245 is displaced accordingly. Since the upper end of the pressure rod 243 is slidably disposed in the groove, the change in the trajectory of the groove forces the pressure rod 243 to move linearly in the vertical direction. The fixed connection between the pressure rod 243 and the third piston 242 causes the third piston 242 to slide axially synchronously within the pressure cylinder 241. The third piston 242 compresses the hydraulic medium in the fourth pressure chamber 244. Because the fourth pressure chamber 244 is connected to the first pressure chamber 211 of the adjusting seat 210, the generated pressure is instantly transmitted to the first pressure chamber 211, realizing a rapid increase in system pressure. When the external force is removed, the return spring 246 releases its stored elastic potential energy, pushing the pressure rod 243 to move in the opposite direction and causing the third piston 242 to retract. Simultaneously, the swing arm 245 automatically returns to its initial position through the sliding engagement of the groove and the pressure rod 243. The volume of the fourth pressure chamber 244 is restored, and the pressure in the first pressure chamber 211 is released. This structure provides instantaneous high pressure for rapid testing of the functionality of pressure instruments under test.

[0041] In some embodiments of this utility model, the inner diameter of the second pressure chamber 224 is D1, the inner diameter of the third pressure chamber 234 is D2, and the inner diameter of the fourth pressure chamber 244 is D3, wherein D2 < D1 < D3.

[0042] In some embodiments of this utility model, a first connecting rod 250 and a second connecting rod 260 are respectively provided on both sides of the adjusting seat 210. A first three-way valve 251 is provided at the end of the first connecting rod 250, and the first three-way valve 251 is connected to the first connecting pipe 201; a second three-way valve 261 is provided at the end of the second connecting rod 260, and the second three-way valve 261 is connected to the second connecting pipe 202. Specifically, in this embodiment, the first pressure chamber 211 of the adjusting seat 210 serves as the system pressure hub, and its internal pressure is transmitted to the internal flow channels of the first connecting rod 250 and the second connecting rod 260 through the interfaces on both sides respectively; the first three-way valve 251 installed at the end of the first connecting rod 250 is directly connected to the first connecting pipe 201 of the calibration device, while the second three-way valve 261 at the end of the second connecting rod 260 is connected to the second connecting pipe 202. When pressure source 200 outputs pressure to the first pressure chamber 211, this pressure is simultaneously transmitted via the first connecting rod 250 to the first three-way valve 251, and then via the first connecting pipe 201 to the test interface 312 of the comparison test bench 310. Simultaneously, the same pressure is transmitted via the second connecting rod 260 to the second three-way valve 261, and then via the second connecting pipe 202 to the comparison interface 311 of the comparison test bench 310. Operators can control the opening, closing, or switching to a pressure relief state of the two pressure paths by rotating the manual handles of the first three-way valve 251 and the second three-way valve 261, achieving independent management of pressure transmission.

[0043] In some embodiments of this utility model, the comparison test stand 310 is provided with a first pressure relief port 330 and a second pressure relief port 340. The first pressure relief port 330 is connected to a first connecting pipe 201, and the second pressure relief port 340 is connected to a second connecting pipe 202. The first pressure relief port 330 is directly connected to the first connecting pipe 201 through an internal flow channel, and the other end of the first connecting pipe 201 is connected to the test interface 312 of the comparison test stand 310. Similarly, the second pressure relief port 340 is directly connected to the second connecting pipe 202, and the other end of the second connecting pipe 202 is connected to the comparison interface 311. When the calibration or testing process is completed, the operator can independently operate the valve mechanism of the first pressure relief port 330 and the second pressure relief port 340 to open the closed pressure loop between the first connecting pipe 201 and the test instrument to the atmosphere through the first pressure relief port 330, and simultaneously open the closed loop between the second connecting pipe 202 and the comparison pressure gauge 320 to the atmosphere through the second pressure relief port 340. This design ensures that the pressure medium at the instrument under test and the standard gauge can be discharged directly to the outside through the shortest path, achieving independent, rapid, and complete unloading of the two pressure systems.

[0044] In some embodiments of this invention, the pressure gauge 320 is an electronic pressure gauge with an accuracy of D, wherein -0.05%FS≤D≤0.05%FS. By using a high-precision electronic pressure gauge, pressure information can be read visually.

[0045] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A high-precision calibration device for mining pressure instruments, characterized in that, include: Base (100); Pressure source (200), the pressure source (200) is fixedly installed on the base (100), and the output end of the pressure source (200) is provided with a first connecting pipe (201) and a second connecting pipe (202). A comparison testing mechanism (300) is provided with a comparison testing platform (310), which is fixedly connected to the base (100). The comparison testing platform (310) is provided with a comparison interface (311) and at least one interface to be tested (312). One end of the interface to be tested (312) is connected to the first connecting pipe (201), one end of the comparison interface (311) is connected to the second connecting pipe (202), and the other end of the comparison interface (311) is connected to the comparison pressure gauge (320).

2. The high-precision mining pressure instrument calibration device according to claim 1, characterized in that, The pressure source (200) includes an adjusting seat (210) and a pressurizing assembly (220). The pressurizing assembly (220) is provided with a pressure cylinder (221), a first piston (222), and a drive rod (223). The adjusting seat (210) is provided with a first pressure chamber (211), and the pressure cylinder (221) is provided with a second pressure chamber (224). The first pressure chamber (211) is connected to the second pressure chamber (224). The first piston (222) is slidably connected to the pressure cylinder (221) along the axial direction. The drive rod (223) is threadedly connected to the pressure cylinder (221). One end of the drive rod (223) passes through the pressure cylinder (221) and is rotatably connected to the first piston (222).

3. The high-precision mining pressure instrument calibration device according to claim 2, characterized in that, One end of the drive rod (223) is provided with a rotating handle (225).

4. The high-precision mining pressure instrument calibration device according to claim 2, characterized in that, The pressure source (200) includes a fine-tuning assembly (230), which is provided with a fine-tuning cylinder (231), a second piston (232) and a fine-tuning rod (233). The fine-tuning cylinder (231) is provided with a third pressure chamber (234), which is connected to the first pressure chamber (211). The second piston (232) is slidably connected to the fine-tuning cylinder (231) along the axial direction. The fine-tuning rod (233) is threadedly connected to the fine-tuning cylinder (231). One end of the fine-tuning rod (233) passes through the fine-tuning cylinder (231) and is rotatably connected to the first piston (222).

5. The high-precision mine pressure instrument calibration device according to claim 4, characterized in that, A knob (235) is provided at one end of the fine-tuning rod (233).

6. The high-precision mining pressure instrument calibration device according to claim 4, characterized in that, The pressure source (200) includes a rapid pressurization assembly (240), which is provided with a pressurization cylinder (241), a third piston (242) and a pressurization rod (243). The pressurization cylinder (241) is provided with a fourth pressure chamber (244), which is connected to the first pressure chamber (211). The third piston (242) is slidably connected to the pressurization cylinder (241) along the axial direction. The pressurization rod (243) is fixedly connected to the pressurization cylinder (241). One end of the pressurization rod (243) passes through the pressurization cylinder (241) and is fixedly connected to the third piston (242).

7. The high-precision mine pressure instrument calibration device according to claim 6, characterized in that, The pressurizing assembly (240) includes a drive rocker arm (245), one end of which is rotatably connected to the pressurizing cylinder (241). A groove is provided on the drive rocker arm (245), and the upper end of the pressurizing rod (243) is slidably disposed in the groove. A return spring (246) is provided between the pressurizing rod (243) and the pressurizing cylinder (241).

8. The high-precision mine pressure instrument calibration device according to claim 7, characterized in that, The adjusting seat (210) is provided with a first connecting rod (250) and a second connecting rod (260) on both sides respectively. The end of the first connecting rod (250) is provided with a first three-way valve (251), which is connected to the first connecting pipe (201). The end of the second connecting rod (260) is provided with a second three-way valve (261), which is connected to the second connecting pipe (202).

9. The high-precision mining pressure instrument calibration device according to claim 1, characterized in that, The comparative test bench (310) is provided with a first pressure relief port (330) and a second pressure relief port (340). The first pressure relief port (330) is connected to the first connecting pipe (201), and the second pressure relief port (340) is connected to the second connecting pipe (202).

10. The high-precision mining pressure instrument calibration device according to claim 1, characterized in that, The comparative pressure gauge (320) is an electronic pressure gauge with an accuracy of D, wherein -0.05%FS≤D≤0.05%FS.

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