Vacuum nitrogen pressure riveting sealing equipment for geophone

Abstract

The invention discloses a geophone vacuum nitrogen pressure riveting sealing device which comprises a machine body, a workbench is arranged in the middle of the machine body, and a positioning tool used for placing a geophone to be sealed is arranged on the workbench. The machine body is provided with a vacuum-nitrogen circulating system connected with the positioning tool below the workbench, the vacuum-nitrogen circulating system comprises a vacuum pump and a nitrogen source which are fixedly arranged at the lower part of the machine body, the vacuum pump is communicated with a vacuumizing pipe, the nitrogen source is provided with a nitrogen supply pipe, and the vacuumizing pipe is communicated with the nitrogen supply pipe. And the vacuumizing pipe and the nitrogen supply pipe are communicated with one end of a main pipe through a multi-way valve. Compared with a traditional pneumatic pressing rivet device, the pressing rivet packaging consistency of the geophone is remarkably improved, the shell deformation of the geophone in the pressing rivet process is greatly reduced, and the sealing qualification rate of pressing rivet packaging of the geophone is effectively guaranteed.

Description

Technical Field

[0001] This invention relates to the field of petroleum exploration equipment processing, and in particular to a vacuum nitrogen pressure sealing device for seismic detectors. Background Technology

[0002] A geophone is an electromechanical device that converts seismic waves from the ground or water into electrical signals, and is an indispensable core piece of equipment in oil exploration. The core components inside a geophone, such as magnets, spring sheets, and enameled wires, are extremely sensitive to oxidation. Therefore, the sealing process must be completed in an air-isolated environment to prevent oxidation and corrosion of the internal raw materials. Current equipment using a press-fit sealing process has the following drawbacks: First, vacuum and nitrogen replacement are incomplete. Traditional equipment often uses a single vacuum followed by nitrogen filling, which cannot remove residual air from the tiny gaps inside the geophone, resulting in a high oxygen content (usually >1%) and still posing an oxidation risk. Second, the press-fit process is disconnected from gas environment control. Pressure fluctuations in the sealing cavity during press-fitting can easily occur, leading to air backflow. Third, the precision of press-fitting force and displacement control is insufficient. Traditional pneumatic or hydraulic press-fitting equipment experiences large pressure fluctuations (±5% or more), easily leading to over-press-fitting causing component damage or under-press-fitting causing seal failure. Fourth, there is a lack of dedicated positioning fixtures for the thin-walled shell of the geophone, which can easily cause shell deformation during press-fitting, affecting product accuracy. Therefore, developing a specialized device that integrates deep vacuum replacement, nitrogen protection, and high-precision riveting control is of great significance for improving the sealing quality and service life of seismic detectors. Summary of the Invention

[0003] The purpose of this invention is to provide a vacuum nitrogen pressure sealing device for seismic detectors, thereby solving the technical problems mentioned in the background.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: This invention discloses a vacuum nitrogen press-sealing device for seismic detectors, comprising a body, a worktable in the middle of the body, a positioning fixture for placing the seismic detector to be sealed on the worktable, a vacuum-nitrogen circulation system connected to the positioning fixture below the worktable, the vacuum-nitrogen circulation system including a vacuum pump and a nitrogen source fixedly mounted at the lower part of the body, a vacuum pump connected to a vacuum tube, and a nitrogen source connected to a nitrogen supply tube, the vacuum tube and the nitrogen supply tube being connected to one end of a main tube via a multi-port valve, the other end of the main tube being connected to the positioning fixture; a press-sealing actuator fixedly mounted above the worktable, the press-sealing actuator including a servo press fixedly mounted on the worktable, the drive end of the servo press facing the positioning fixture and connected to a press-sealing mold.

[0005] Furthermore, the positioning fixture includes a base fixedly mounted on the workbench, the other end of the main tube communicating with the inner cavity of the base, and a positioning block provided in the inner cavity of the base; the upper end of the base is an open structure and a pressure cover is provided that can be raised and lowered, a lifting locking mechanism for driving the lifting and lowering movement of the pressure cover is provided between the base and the pressure cover, and a fluororubber sealing ring that mates with the inner peripheral wall of the base is fixedly mounted on the lower end of the pressure cover, so that a sealed cavity is formed inside the base after the pressure cover is closed.

[0006] Furthermore, the upper part of the positioning block is provided with a positioning groove that is adapted to the outer shell of the seismic detector to be sealed, and a hard alloy support block is fixedly provided at the bottom of the positioning groove.

[0007] Furthermore, the communication position between the main tube and the base is located above the positioning block. A partition is fixedly installed inside the base below the positioning block. Two slide rods are symmetrically slidably installed on the partition. The upper ends of the two slide rods are fixedly connected to the bottom of the positioning block. A first spring is sleeved on each slide rod at the position between the positioning block and the partition. A limit head is fixedly installed at the lower end of each slide rod.

[0008] Furthermore, the lifting and locking mechanism includes two symmetrically fixed rods fixedly disposed below the base, with a lifting plate slidably disposed on both fixed rods. A driving assembly for driving the lifting plate to slide linearly in the vertical direction is disposed below the base. Two horizontal connecting rods are symmetrically fixedly disposed near the upper part of the outer peripheral wall of the pressure cover. Vertical connecting rods are symmetrically fixedly disposed below the two horizontal connecting rods. The two vertical connecting rods slide in cooperation with the worktable, and a second spring is sleeved on each vertical connecting rod at the part located between the corresponding horizontal connecting rod and the worktable. The lower ends of the two vertical connecting rods extend to the lower part of the lifting plate and a horizontal force-bearing plate is fixedly disposed on the side near the lifting plate.

[0009] Furthermore, the drive assembly includes a mounting plate fixedly disposed at the lower ends of the two fixed rods, a transmission screw rotatably disposed between the base and the mounting plate, a servo motor for driving the transmission screw to rotate fixedly disposed below the mounting plate, and a transmission sleeve adapted to the transmission screw fixedly disposed in the middle of the lifting plate.

[0010] Furthermore, the nitrogen supply pipe is connected to an on / off valve and a gas buffer tank. The gas buffer tank has a molecular sieve drying layer fixed inside and an insulation layer on the outside.

[0011] Furthermore, an oxygen content sensor and a pressure sensor are provided on the part of the main tube near the base.

[0012] Furthermore, two guide rails are symmetrically fixedly arranged on the machine body, and the riveting mold is connected to the drive end of the servo press through a slide. Two guide sliders, each adapted to one of the two guide rails, are symmetrically fixedly arranged on the slide.

[0013] Furthermore, a displacement sensor is fixedly installed on one side of the machine body at a position directly opposite one of the guide sliders.

[0014] Compared with the prior art, the beneficial technical effects of the present invention are as follows: This invention innovatively integrates multiple vacuum-nitrogen cycle replacement with press-fit sealing operations. By monitoring oxygen content and gas pressure in real time to achieve closed-loop control, the oxygen content inside the seismic detector is stably controlled below 0.1%, solving the problem of internal oxidation of seismic detectors caused by excessive oxygen content in traditional equipment. Aging tests have verified that the product lifespan is extended by more than 50%.

[0015] This invention employs a servo press-driven riveting actuator, combined with force-displacement closed-loop control, to achieve precise control of riveting force and displacement. Compared with traditional pneumatic riveting equipment, it significantly improves the consistency of riveting and packaging of seismic detectors and greatly reduces the deformation of the seismic detector shell during the riveting process, effectively ensuring the sealing qualification rate of the seismic detector riveting and packaging.

[0016] The positioning fixture for placing a seismic detector in this invention uses a hard alloy support block and a fluororubber sealing ring, which not only ensures the positioning accuracy of the detector under high pressure riveting force, but also ensures the high airtightness of the internal sealing cavity of the fixture. Combined with the riveting in a slightly positive pressure nitrogen environment, it completely avoids air backflow at the moment of riveting and solves the oxidation problem caused by leakage of the sealing cavity in traditional equipment. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings.

[0018] Figure 1 This is a schematic diagram of the overall front structure of the present invention; Figure 2 This is a schematic diagram of the overall back structure of the present invention; Figure 3 This is a schematic diagram of the overall side structure of the present invention; Figure 4 This is a schematic cross-sectional view of the overall structure of the present invention; Figure 5 This is a schematic diagram of the positioning tooling structure of the present invention; Figure 6 This is a schematic diagram of the gas buffer tank structure of the present invention; Explanation of reference numerals in the attached drawings: 1. Machine body; 2. Worktable; 3. Base; 4. Pressure cover; 5. Positioning block; 6. Positioning groove; 7. Hard alloy support block; 8. Partition plate; 9. Slide rod; 10. First spring; 11. Limiting head; 12. Fixing rod; 13. Lifting plate; 14. Mounting plate; 15. Transmission screw; 16. Servo motor; 17. Transmission sleeve; 18. Horizontal connecting rod; 19. Vertical connecting rod; 20. Second spring; 21. Force plate; 2. Fluororubber sealing ring; 23. Vacuum pump; 24. Nitrogen source; 25. Vacuum extraction pipe; 26. Nitrogen supply pipe; 27. On / off valve; 28. Gas buffer tank; 29. ​​Molecular sieve drying layer; 30. Insulation layer; 31. Multi-way valve; 32. Main pipe; 33. Oxygen content sensor; 34. Gas pressure sensor; 35. Servo press; 36. Riveting die; 37. Guide rail; 38. Carriage; 39. Guide slider; 40. Displacement sensor. Detailed Implementation

[0019] like Figures 1-6 As shown, a vacuum nitrogen pressure sealing device for a seismic detector includes a body 1, and a worktable 2 is provided in the middle of the body 1.

[0020] A positioning fixture for placing a seismic detector to be sealed is fixedly installed on the workbench 2. In this embodiment, the positioning fixture includes a base 3 fixedly installed on the workbench 2, and a positioning block 5 is installed in the inner cavity of the base 3. The upper part of the positioning block 5 has a positioning groove 6 adapted to the outer shell of the seismic detector to be sealed, and a hard alloy support block 7 is fixedly installed at the bottom of the positioning groove 6. In this embodiment, a horizontal partition 8 is fixedly arranged inside the base 3 below the positioning block 5. Two sliding rods 9 are symmetrically slidably installed on the partition 8. The upper ends of the two sliding rods 9 are fixedly connected to the bottom of the positioning block 5. A first spring 10 is fitted on each sliding rod 9 at the part located between the positioning block 5 and the partition 8. A limit head 11 is fixedly provided at the lower end of each sliding rod 9.

[0021] The upper end of the base 3 has an open structure and a pressure cover 4 that can be raised and lowered. A lifting and locking mechanism for driving the pressure cover 4 to move up and down is provided between the base 3 and the pressure cover 4. In this embodiment, the lifting and locking mechanism includes two symmetrical vertically fixed rods 12 fixedly disposed below the base 3. A lifting plate 13 is slidably mounted on both fixed rods 12. A drive assembly for driving the lifting plate 13 to slide linearly in the vertical direction is provided below the base 3. The drive assembly includes a mounting plate 14 fixedly and horizontally disposed below the two fixed rods 12. A transmission screw 15 is rotatably mounted between the base 3 and the mounting plate 14. A servo motor 16 for driving the transmission screw 15 to rotate is fixedly mounted below the mounting plate 14. A transmission sleeve 17 adapted to the transmission screw 15 is fixedly mounted in the middle of the lifting plate 13. When the servo motor 16 drives the transmission screw 15 to rotate, since the transmission sleeve 17 maintains a threaded connection with the transmission screw 15, the rotational motion of the transmission screw 15 is converted into the linear movement of the transmission sleeve 17, thereby causing the lifting plate 13 to move linearly in the vertical direction.

[0022] Two horizontal connecting rods 18 are symmetrically fixedly arranged on the outer peripheral wall of the pressure cover 4 near the upper end. Vertical connecting rods 19 are symmetrically fixedly arranged below the two horizontal connecting rods 18. The two vertical connecting rods 19 slide in engagement with the worktable 2, and each vertical connecting rod 19 has a second spring 20 fitted at the position between the corresponding horizontal connecting rod 18 and the worktable 2. The lower ends of the two vertical connecting rods 19 extend below the lifting plate 13, and a horizontal force-bearing plate 21 is fixedly arranged on the side near the lifting plate 13.

[0023] The lower end of the pressure cap 4 is fixedly provided with a fluororubber sealing ring 22 that matches the inner peripheral wall of the base 3. After the pressure cap 4 is closed, the fluororubber sealing ring 22 and the inner wall of the base 3 are tightly fitted to form a sealed cavity inside the base 3. The leakage rate of the sealed cavity is required to be ≤0.1Pa·L / s.

[0024] The machine body 1 is equipped with a vacuum-nitrogen circulation system connected to a positioning fixture below the workbench 2. The vacuum-nitrogen circulation system includes a vacuum pump 23 and a nitrogen source 24 fixedly installed at the bottom of the machine body 1. The vacuum pump 23 is an oil-free vortex vacuum pump with an ultimate vacuum of ≤5Pa and a pumping speed of 20-50L / min. The nitrogen source has an output pressure of 0.2-0.5MPa and a nitrogen purity of ≥99.999%. A vacuum pumping pipe 25 is connected to the vacuum pump 23, and a nitrogen supply pipe 26 is connected to the nitrogen source 24. A shut-off valve 27 and a gas buffer tank 28 are connected to the nitrogen supply pipe 26. The gas buffer tank 28 has a volume of 5-10L, and a molecular sieve drying layer 29 is fixedly installed on its cross-section inside. An insulation layer 30 is fitted onto the outside of the gas buffer tank 28 to ensure an operating temperature of 5-40℃. The vacuum tube 25 and the nitrogen supply tube 26 are connected to one end of the main tube 32 via a multi-way valve 31, and the other end of the main tube 32 is connected to the positioning fixture. Specifically, the other end of the main tube 32 is connected to the inner cavity of the base 3, and the connection point between the main tube 32 and the base 3 is located above the positioning block 5. Furthermore, in this example, both the on / off valve 27 and the multi-way valve 31 are solenoid valves. An oxygen content sensor 33 and a pressure sensor 34 are installed on the main tube 32 near the base 3. The oxygen content sensor has a measurement range of 0-1% and an accuracy of ±0.01%; the pressure sensor has a measurement range of -0.1MPa to 0.3MPa and an accuracy of ±0.001MPa.

[0025] A riveting and sealing actuator is fixedly installed above the worktable 2. The riveting and sealing actuator includes a servo press 35 fixedly installed on the worktable 2. The servo press 35 has a rated pressure of 5-20KN, a pressure control accuracy of ±1%FS, a displacement control accuracy of ±0.01mm, and a riveting speed that is continuously adjustable within the range of 0.5-5mm / s. The drive end of the servo press 35 is directly opposite the positioning fixture and is fixedly connected to a riveting die 36. The riveting die is made of Cr12MoV die steel, with a nitrided surface, a hardness ≥HRC58, a working surface roughness Ra≤0.8μm, and a die positioning accuracy of ±0.02mm.

[0026] In this embodiment, two vertical guide rails 37 are symmetrically fixedly installed on the machine body 1. The riveting die 36 is connected to the drive end of the servo press 35 via a slide 38. Two guide sliders 39, each adapted to one of the two guide rails 37, are symmetrically fixedly installed on the slide 38. The stability of the linear displacement of the riveting die 36 is ensured by the limiting sliding cooperation between the two sets of guide sliders 39 and the guide rails 37. A displacement sensor 40 is fixedly installed on one side of the machine body 1, opposite one of the guide sliders 39, to sense and monitor the linear displacement of the riveting die 36.

[0027] In addition, the present invention also includes a PLC controller installed on the machine body and a touch screen for operating the PLC controller. The servo motor 16, vacuum pump 23, on / off valve 27, multi-way valve 31, oxygen content sensor 33, air pressure sensor 34, servo press 35, and displacement sensor 40 are all electrically connected to the PLC controller. The PLC controller adopts the Siemens S7-1200 series, with built-in vacuum-nitrogen cycle control algorithm and riveting force-displacement closed-loop control module, supporting the storage of ≥50 sets of riveting process parameters and one-click recall.

[0028] The specific working steps of this invention are as follows: Step 1, Positioning and Clamping Stage: Place the seismic detector to be sealed (with pre-installed sealing cap) into the positioning groove 6 in the base 3. The hard alloy support block 7 provides rigid support for the seismic detector. The PLC controller controls the start of the servo motor 16 to make the lifting plate 13 move the pressure cap 4 downward to seal the inner cavity of the base 3. Moreover, the threaded locking structure of the transmission screw 15 and the transmission screw sleeve 17 can prevent the pressure cap 4 from moving upward. The fluororubber sealing ring 22 ensures that the sealing cavity forms a highly airtight space (leakage rate ≤0.1Pa·L / s).

[0029] Step 2, Vacuum-Nitrogen Cycle Replacement Stage: The PLC controller starts the vacuum pump 23, connecting the main pipe 32 and the vacuum tube 25 via the multi-way valve 31, pumping the pressure inside the sealed cavity of the base 3 to ≤10Pa (monitored and fed back by the pneumatic sensor), and holding for 3 seconds; then, the vacuum pump 23 is turned off, and the on / off valve 27 on the nitrogen supply tube 26 is opened, connecting the main pipe 32 and the nitrogen supply tube 26 via the multi-way valve 31, filling the sealed cavity with nitrogen to 0.05MPa, and allowing it to stand for 2 seconds to complete the first cycle. This process is repeated 2-4 times (can be set via the touchscreen). After each cycle, the oxygen content sensor monitors the oxygen content inside the sealed cavity of the base 3, automatically stopping the cycle when the oxygen content is ≤0.1%. During the nitrogen supply process, the molecular sieve drying layer 29 of the gas buffer tank 28 can lower the nitrogen dew point to below -40℃, preventing moisture from entering the seismic detector.

[0030] Step 3, Riveting and Sealing Stage: After the cyclic replacement is completed, the sealing cavity is maintained in a slightly positive pressure nitrogen environment of 0.02-0.03MPa. The PLC controller calls the preset riveting parameters (pressure 3-10kN, displacement 1.2-2.5mm, speed 1-3mm / s), and starts the servo press 35 to drive the riveting mold 36 to descend. This applies precise pressure to the seismic detector sealing cover 4. At the same time, the servo motor 16 drives the transmission screw 15 to rotate in the opposite direction, causing the lifting plate 13 to move upward and reset. The displacement sensor 40 provides real-time feedback on the pressing depth. Through the force-displacement closed-loop control algorithm preset by the PLC controller, the speed is automatically reduced to 0.5mm / s 0.2mm before the riveting endpoint to avoid impact deformation. During the riveting process, the pressure and displacement curves are displayed on the touch screen in real time, which can automatically judge the riveting quality (an alarm will be triggered immediately if an abnormal curve appears).

[0031] Step 4, Part Removal Stage: After the riveting is completed, the servo press 35 drives the riveting mold 36 to reset. Under the reset force of the second spring 20, the cover 4 automatically moves upward and separates from the base 3. Under the reset force of the first spring 10, the positioning block 5 moves upward inside the base 3, causing the encapsulated seismic detector to extend out of the base, making it easier for the operator to remove the seismic detector from the positioning fixture. The equipment automatically records the riveting parameters of the part and resets to wait for the next work cycle.

[0032] To verify the technical effects of the present invention, the following comparative experiments were conducted: 1. Comparison of Oxygen Content Control Effects: The equipment of this invention and the traditional single-vacuum + nitrogen filling and riveting equipment were used to process the same batch of detectors (100 pieces). After three cycles of replacement, the oxygen content inside the detectors of this invention was ≤0.08%; the oxygen content after treatment with the traditional equipment was 0.92±0.15%. The low-oxygen environment control effect of this invention is significantly better than that of the traditional equipment.

[0033] 2. Sealing Performance Comparison: Seismic detectors processed by this invention and existing press-fitting equipment were compared using helium mass spectrometry leak testing (detection pressure 0.2 MPa) and high-temperature, high-humidity (60℃, 95% RH) aging tests (1000 hours). The helium leakage rate of the press-fitted seismic detectors of this invention was ≤1×10⁻⁶. -9 Pa·m 3 / s, insulation resistance decrease rate after aging ≤3%; 12 detectors processed by traditional equipment have helium leakage rate >5×10 -8 Pa·m 3 / s, the average insulation resistance decreases by 28% after aging, and the seismic detector processed by this invention has better sealing performance.

[0034] 3. Comparison of riveting accuracy: The deformation of the detector housing after riveting using the equipment of the present invention is ≤0.03mm, and the riveting dimension consistency (CPK value) reaches 1.68; the deformation of the housing after riveting using the traditional equipment is ≥0.1mm, and the CPK value is 0.82. The riveting accuracy and consistency of the present invention are superior.

[0035] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A vacuum nitrogen pressure sealing device for seismic detectors, characterized in that: The device includes a main body, a worktable in the middle of the main body, a positioning fixture for placing a seismic detector to be sealed on the worktable, a vacuum-nitrogen circulation system connected to the positioning fixture below the worktable, the vacuum-nitrogen circulation system including a vacuum pump and a nitrogen source fixedly installed at the lower part of the main body, a vacuum pump connected to a vacuum tube, and a nitrogen source connected to a nitrogen supply tube, the vacuum tube and the nitrogen supply tube being connected to one end of a main pipe via a multi-port valve, the other end of the main pipe being connected to the positioning fixture; a riveting and sealing actuator is fixedly installed above the worktable, the riveting and sealing actuator including a servo press fixedly installed on the worktable, the drive end of the servo press facing the positioning fixture and connected to a riveting mold.

2. The vacuum nitrogen pressure sealing device for seismic detectors according to claim 1, characterized in that: The positioning fixture includes a base fixedly mounted on the workbench, the other end of the main tube communicating with the inner cavity of the base, and a positioning block provided in the inner cavity of the base; the upper end of the base is an open structure and a pressure cover is provided that can be raised and lowered, and a lifting locking mechanism for driving the pressure cover to move up and down is provided between the base and the pressure cover; a fluororubber sealing ring that mates with the inner circumferential wall of the base is fixedly provided at the lower end of the pressure cover, and a sealed cavity is formed inside the base after the pressure cover is closed.

3. The vacuum nitrogen pressure sealing device for seismic detectors according to claim 2, characterized in that: The upper part of the positioning block is provided with a positioning groove that is adapted to the outer shell of the seismic detector to be sealed, and a hard alloy support block is fixedly installed at the bottom of the positioning groove.

4. The vacuum nitrogen pressure sealing device for seismic detectors according to claim 2, characterized in that: The communication position between the main tube and the base is located above the positioning block. A partition is fixedly installed inside the base below the positioning block. Two slide rods are symmetrically slidably installed on the partition. The upper ends of the two slide rods are fixedly connected to the bottom of the positioning block. A first spring is sleeved on each slide rod at the part located between the positioning block and the partition. A limit head is fixedly installed at the lower end of each slide rod.

5. The vacuum nitrogen pressure sealing device for seismic detectors according to claim 2, characterized in that: The lifting and locking mechanism includes two symmetrically fixed rods fixedly disposed below the base. A lifting plate is slidably disposed on both fixed rods. A driving assembly for driving the lifting plate to slide linearly in the vertical direction is disposed below the base. Two horizontal connecting rods are symmetrically fixedly disposed near the upper part of the outer peripheral wall of the pressure cover. Vertical connecting rods are symmetrically fixedly disposed below the two horizontal connecting rods. The two vertical connecting rods slide in cooperation with the worktable. A second spring is sleeved on each vertical connecting rod at the part located between the corresponding horizontal connecting rod and the worktable. The lower ends of the two vertical connecting rods extend to the lower part of the lifting plate and a horizontal force-bearing plate is fixedly disposed on the side near the lifting plate.

6. The vacuum nitrogen pressure sealing device for seismic detectors according to claim 5, characterized in that: The drive assembly includes a mounting plate fixedly disposed at the lower ends of the two fixed rods, a transmission screw rotatably disposed between the base and the mounting plate, a servo motor for driving the transmission screw to rotate fixedly disposed below the mounting plate, and a transmission sleeve adapted to the transmission screw fixedly disposed in the middle of the lifting plate.

7. The vacuum nitrogen pressure sealing device for seismic detectors according to claim 1, characterized in that: The nitrogen supply pipe is connected to an on / off valve and a gas buffer tank. The gas buffer tank has a molecular sieve drying layer fixed inside and an insulation layer on the outside.

8. The vacuum nitrogen pressure sealing device for seismic detectors according to claim 1, characterized in that: An oxygen content sensor and a pressure sensor are installed on the part of the main tube near the base.

9. The vacuum nitrogen pressure sealing device for seismic detectors according to claim 1, characterized in that: Two guide rails are symmetrically fixed on the machine body. The riveting mold is connected to the drive end of the servo press through a slide. Two guide sliders, each adapted to one of the two guide rails, are symmetrically fixed on the slide.

10. The vacuum nitrogen pressure sealing device for a seismic detector according to claim 9, characterized in that: A displacement sensor is fixedly installed on one side of the machine body at a position directly opposite one of the guide sliders.

Images