High reliability car gauge level pressure sensor o-ring automatic press fitting machine

Abstract

This invention discloses an automatic O-ring press-fitting machine for high-reliability automotive-grade pressure sensors, belonging to the field of industrial assembly technology. It utilizes a dual-station material handling mechanism and a feeding and pressing mechanism. The O-ring is horizontally conveyed by a conveyor plate to a support ring for initial pre-assembly. The support ring is then pushed upwards, allowing the O-ring to be smoothly pushed upwards along the conical surface of the expanding conical sleeve of the feeding and pressing mechanism under uniform thrust. This process does not directly clamp the O-ring itself, allowing it to be pushed to the magnetic diameter-maintaining sleeve of the diameter-maintaining pressing assembly under a constrained, coaxial, and uniformly stressed state for target positioning. This avoids localized stress concentration and distortion caused by asynchronous deformation, achieving non-destructive diameter expansion and positioning. Combined with the diameter-maintaining pressing assembly's diameter-maintaining downward pressing mode, the O-ring is smoothly and flexibly fitted onto the sensor, achieving non-destructive flexible assembly. Furthermore, the dual-station rotating parallel operation is suitable for high-speed automated production lines.

Description

Technical Field

[0001] This invention relates to the field of industrial automation assembly technology, and more specifically, to an automatic press-fitting machine for O-rings of high-reliability automotive-grade pressure sensors. Background Technology

[0002] Automotive-grade pressure sensors (used to detect oil pressure, fuel pressure, brake pressure, air conditioning pressure, etc.) are directly related to a vehicle's power, safety, and emission systems. Their core function is to continuously, stably, and accurately measure pressure under extreme operating conditions. O-rings play the role of "gatekeepers" in this context, with core functions including static sealing, isolation protection, and maintaining integrity. They are directly related to the vehicle's safety, performance, environmental friendliness, and reliability.

[0003] Therefore, for automotive-grade pressure sensors, the installation requirements for the sealing ring are very high. It must be installed precisely in the sealing groove of the sealing ring and must not be twisted. If the sealing ring is twisted, it will seriously affect the sealing effect. You can refer to the main disclosure of patent number CN113878330B. This patent is used to automatically fit a soft sealing ring onto the sensor. However, in the process of feeding and pressing the sealing ring, this patent uses grippers to open and clamp the sealing ring from the inside out. It is difficult to control the clamping force. If the clamping force of the hard grippers is too large, it is easy to cause local deformation, indentation or even tearing of the sealing ring. If the clamping force is too small, it may fall off or be misaligned during the transfer. In addition, uneven or asynchronous opening of the grippers may also cause local stress concentration, torsion or folding of the sealing ring.

[0004] To address these issues, a high-reliability automotive-grade pressure sensor O-ring automatic press-fitting machine is proposed. Summary of the Invention

[0005] The purpose of this invention is to provide an automatic press-fitting machine for O-rings of high-reliability automotive-grade pressure sensors. It ensures that the O-ring is positioned without twisting by using conical guide and uniform diameter expansion. Combined with the diameter-maintaining pressing assembly mode, the O-ring is smoothly fitted onto the sensor, achieving flexible assembly without damage.

[0006] The objective of this invention can be achieved through the following technical solution: an automatic press-fitting machine for O-rings of high-reliability automotive-grade pressure sensors, including a vibrating feeder, a material handling mechanism, a material feeding and pressing mechanism, and a sensor positioning mechanism installed on the pressing table and interconnected and adapted to each other. The discharge port of the vibrating feeder is fitted with a conveying plate adapted to the material handling mechanism and used for feeding O-rings.

[0007] The material handling mechanism includes a lower rotating frame that is rotated and mounted on the assembly table. Material handling guide columns are fixedly connected to both ends of the lower rotating frame. Each pair of material handling guide columns has a support ring that is driven to lift and lower for docking with the conveyor plate and the feeding and pressing mechanism. The top of the support ring is provided with a material receiving groove for accommodating the O-ring seal. The side of the material receiving groove facing the conveyor plate has a push opening with a width that is the same as the outer diameter of the O-ring seal.

[0008] The feeding and pressing mechanism includes a fixed bracket and an upper rotating frame rotatably mounted on the fixed bracket and perpendicular to one of the material picking guide columns, away from the conveying plate. The lower ends of the front and rear sides of the upper rotating frame are fixedly installed with positioning guide columns corresponding to the positions of the material picking guide columns. The positioning guide column includes a gauge-maintaining column and an expanding conical sleeve that are connected vertically. The outer diameter of the gauge-maintaining column is larger than the inner diameter of the O-ring seal, and the outer diameter of the expanding conical sleeve gradually increases from bottom to top. A gauge-maintaining pressing assembly is movably sleeved on the gauge-maintaining column.

[0009] Furthermore, the material guide post includes a tapered sleeve with a reduced diameter and a hollow post arranged at the top and bottom. The outer diameter of the hollow post is consistent with the inner diameter of the O-ring seal, and the outer diameter of the hollow post gradually decreases from bottom to top.

[0010] Furthermore, the supporting ring is movably mounted on the hollow column via a lifting frame, and a top support cylinder for driving the lifting frame to move up and down is embedded inside the hollow column. The conveying port of the conveying plate is provided with an arc-shaped matching groove that is compatible with the outer ring structure of the supporting ring.

[0011] Furthermore, both sides of the arc-shaped matching groove are fixedly installed with inclined guide plates that connect with both sides of the push port, and the upper surface of the reduced-diameter conical sleeve and the material support groove is flush with the conveying surface of the conveying plate.

[0012] Furthermore, a limiting component is provided at the conveying port of the conveying plate, which includes a bracket fixedly installed at the lower end of the conveying port of the conveying plate. A pair of limiting sheaths that penetrate to the conveying plate are installed on the bracket by a limiting push rod. The pair of limiting sheaths are distributed on both sides of the conveying port of the conveying plate to intercept and limit the O-ring seal.

[0013] Furthermore, the gauge-maintaining press assembly is movably mounted on the gauge-maintaining column via a pusher frame, and a press-fitting cylinder that penetrates into the gauge-maintaining column and is used to drive the pusher frame to rise and fall is fixedly installed at the top of the upper rotating frame.

[0014] Furthermore, the gauge-maintaining press-fit assembly includes a hollow ring movably sleeved on the gauge-maintaining column. The inner ring of the hollow ring has an annular reserved groove with an opening at the lower end. An electromagnetic ring is embedded in the top of the annular reserved groove, and a magnetic gauge-maintaining sleeve is installed on the bottom wall of the electromagnetic ring through an elastic ring.

[0015] Furthermore, the magnetic gauge retaining sleeve is movably sealed onto the gauge retaining column. The outer end of the magnetic gauge retaining sleeve has a gauge retaining ring cavity whose bottom end matches the inner ring structure of the O-ring seal. The lower end wall of the gauge retaining ring cavity extends downwards towards the top of the expanding diameter tapered sleeve and is seamlessly connected to the outer wall of the top of the expanding diameter tapered sleeve.

[0016] Furthermore, the sensor positioning mechanism includes a rotary disk that is rotated and mounted on the assembly table. The rotary disk and the positioning guide post on the side away from the conveyor plate are symmetrically distributed in front and behind as a fixed support. A pair of sensor positioning seats corresponding to the positions of the positioning guide post are installed on the rotary disk along the parallel direction of the upper rotating frame.

[0017] Compared with the prior art, the advantages of this invention are:

[0018] 1. This solution involves setting up a material handling mechanism adapted to the feeding plate of the vibrating feeder and a feeding and pressing mechanism adapted to the material handling mechanism. Both the material handling mechanism and the feeding and pressing mechanism operate in parallel with two stations, making them suitable for high-speed automated production lines. The O-ring is conveyed by the conveyor plate to the support ring for initial pre-installation. The support ring is then lifted upwards, and the O-ring is smoothly and synchronously pushed upwards along the expanding conical sleeve of the feeding and pressing mechanism. This process ensures that the radial expansion of all points on the circumference of the sealing ring occurs simultaneously and equally, avoiding local stress concentration and torsion caused by asynchronous deformation. This achieves non-destructive expansion and positioning of the O-ring. In conjunction with the downward-driven diameter-maintaining pressing assembly, the lower rotating frame is inserted into the sensor, achieving highly reliable automated assembly.

[0019] 2. The diameter-maintaining press-fit assembly of this solution consists of a hollow ring and a magnetic diameter-maintaining sleeve that can be pushed up and down. In the initial state, the magnetic diameter-maintaining sleeve is located at the lower end of the hollow ring by the elastic action of the elastic ring, which is used to maintain the diameter of the O-ring that is pushed up for diameter expansion. During the downward press-fit assembly process, it helps the O-ring to be unobstructed and fit down to the position of the sensor to be sealed. Finally, the magnetic diameter-maintaining sleeve is elastically reset upward by the electromagnetic ring to make it detach from the O-ring. At this time, it retracts back to its natural state and falls accurately into the sealing groove of the sensor, achieving a flexible assembly with almost zero damage.

[0020] 3. Regarding the material handling mechanism, it should be noted that the material handling guide post is set as a reduced-diameter conical sleeve and a hollow column distributed vertically. After the support ring is smoothly conveyed to the material support groove of the support ring, the support ring is moved down until the O-ring is stably fitted on the bottom of the reduced-diameter conical sleeve. This ensures that the O-ring is not rotated out during the left and right rotation and exchange of a pair of support rings, effectively improving the stability of the initial positioning of the O-ring. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the present invention;

[0022] Figure 2This is a structural schematic diagram from another perspective of the present invention;

[0023] Figure 3 This is a schematic diagram of the structure at the junction of the material handling mechanism and the conveyor plate of the present invention;

[0024] Figure 4 This is a schematic diagram showing the disassembled material handling mechanism of the present invention;

[0025] Figure 5 This is a schematic diagram of the structure of the present invention after the O-ring is conveyed to the support ring of the material handling mechanism using a conveyor plate;

[0026] Figure 6 This is a schematic diagram of the structure of the present invention when the support ring is pushed downward to limit the O-ring seal;

[0027] Figure 7 This is a schematic diagram of the structure at the junction of the material handling mechanism and the feeding and pressing mechanism of the present invention;

[0028] Figure 8 This is a bottom view of the feeding and pressing mechanism of the present invention;

[0029] Figure 9 This is a split schematic diagram of the feeding and pressing mechanism of the present invention;

[0030] Figure 10 This is a cross-sectional view of the feeding and pressing mechanism of the present invention;

[0031] Figure 11 This is a cross-sectional schematic diagram of the feeding and pressing mechanism of the present invention;

[0032] Figure 12 This is a cross-sectional schematic diagram of the O-ring of the present invention being pushed to the bottom of the gauge-maintaining press-fit assembly;

[0033] Figure 13 This is a schematic diagram of the structure of the present invention when the O-ring is pushed downward by the gauge-maintaining press-fitting assembly.

[0034] Explanation of the labels in the diagram:

[0035] 1. Vibrating feeder; 101. Conveyor plate; 102. Limiting push rod; 103. Limiting sheath; 2. Lower rotating frame; 3. Material picking guide post; 31. Hollow column; 32. Reducing diameter conical sleeve; 4. Support ring; 401. Material support groove; 402. Pushing port; 5. Top support push cylinder; 6. O-ring seal; 7. Upper rotating frame; 8. Positioning guide post; 81. Diameter maintaining column; 82. Expanding diameter conical sleeve; 9. Diameter maintaining press assembly; 91. Hollow ring; 92. Magnetic diameter maintaining sleeve; 93. Elastic ring; 94. Electromagnetic ring; 10. Pressing push cylinder; 11. Rotary disk; 12. Sensor positioning seat. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0037] Example 1: This invention discloses an automatic press-fitting machine for O-rings of high-reliability automotive-grade pressure sensors. Please refer to [link / reference]. Figure 1 , Figure 2 It includes a vibrating feeder 1, a material taking mechanism, a material feeding and pressing mechanism, and a sensor positioning mechanism that are installed on the pressing table in an interconnected manner. A conveying plate 101 that is adapted to the material taking mechanism and used to feed the O-ring 6 is embedded at the outlet of the vibrating feeder 1. The material taking mechanism and the material feeding and pressing mechanism are vertically adapted to each other.

[0038] Please see Figure 1 and Figures 3-6 The material handling mechanism includes a lower rotating frame 2 that is rotated and installed on the assembly table. Material handling guide posts 3 are fixedly connected to both ends of the lower rotating frame 2. The material handling guide post 3 includes a tapered sleeve 32 with a reduced diameter and a hollow column 31 arranged at the top and bottom. The outer diameter of the hollow column 31 is consistent with the inner diameter of the O-ring 6. The outer diameter of the hollow column 31 gradually decreases from bottom to top. Each pair of hollow columns 31 has a support ring 4 that is driven to lift and lower for docking with the conveying port of the conveying plate 101 and the feeding and pressing mechanism.

[0039] The top of the support ring 4 is provided with a material support groove 401 for accommodating the O-ring seal 6, and the side of the material support groove 401 facing the conveyor plate 101 is provided with a push opening 402 with a width consistent with the outer diameter of the O-ring seal 6. The support ring 4 is movably mounted on the hollow column 31 through the lifting frame. The hollow column 31 is provided with a top support cylinder 5 for driving the lifting frame to lift. The conveying port of the conveyor plate 101 is provided with an arc-shaped matching groove that is compatible with the outer ring structure of the support ring 4.

[0040] Both sides of the arc-shaped matching groove are fixedly installed with inclined guide plates that connect with both sides of the push port 402. The upper surface of the tapered sleeve 32 and the material support groove 401 is flush with the conveying surface of the conveying plate 101. In the initial state, the support ring 4 is located outside 302 and is flush with the top surface of 302 and the conveying surface of the conveying plate 101. The push port 402 faces the side of the conveying plate 101 and is connected to a pair of inclined guide plates.

[0041] The vibrating feeder 1 sorts the O-rings 6 and conveys them to the material tray 401 of the support ring 4 (feeding station) via the conveyor plate 101 for initial pre-installation. The support ring 4 with the pre-installed O-rings 6 is then moved to the bottom of one of the positioning guide posts 8 of the feeding pressing mechanism. Before the rotational replacement, the support ring 4 is pushed downward until the O-rings 6 are stably fitted onto the bottom of the reduced diameter tapered sleeve 32, which plays a stabilizing and limiting role for the support ring 4. This ensures that the O-rings 6 are not thrown out during the left and right rotational replacement of a pair of support rings 4, effectively improving the stability of the initial positioning of the O-rings 6.

[0042] It should be added that a limiting component is provided at the conveying port of the conveying plate 101, which includes a bracket fixedly installed at the lower end of the conveying port of the conveying plate 101. A pair of limiting sheaths 103 that penetrate through the conveying plate 101 are installed on the bracket by a limiting push rod 102. The pair of limiting sheaths 103 are distributed on both sides of the conveying port of the conveying plate 101 to intercept and limit the O-ring 6, so that only one O-ring 6 is conveyed to the support ring 4 at a time.

[0043] Please see Figures 1-2 as well as Figures 7-8 The feeding and pressing mechanism includes a fixed bracket and an upper rotating frame 7 that is rotatably mounted on the fixed bracket and is located away from the conveyor plate 101 and perpendicular to one of the material picking guide columns 3. The lower ends of the front and rear sides of the upper rotating frame 7 are fixedly installed with positioning guide columns 8 corresponding to the positions of the material picking guide columns 3.

[0044] The positioning guide post 8 includes a gauge-maintaining post 81 and an expanding tapered sleeve 82 that are connected vertically. The outer diameter of the gauge-maintaining post 81 is larger than the inner diameter of the O-ring seal 6, and the outer diameter of the expanding tapered sleeve 82 gradually increases from bottom to top. A gauge-maintaining pressing assembly 9 is installed on the gauge-maintaining post 81 and is movably sleeved with it. The gauge-maintaining pressing assembly 9 is movably sleeved on the gauge-maintaining post 81 through a pusher frame. A pressing push cylinder 10 is fixedly installed at the top of the upper rotating frame 7, which penetrates into the interior of the gauge-maintaining post 81 and is used to drive the pusher frame to move up and down.

[0045] The sensor positioning mechanism includes a rotary disk 11 that is rotated and mounted on the assembly table. The rotary disk 11 and the positioning guide post 8 on the side away from the conveyor plate 101 are symmetrically distributed in front and behind the fixed support. A pair of sensor positioning seats 12 corresponding to the positions of the positioning guide post 8 are installed on the rotary disk 11 along the parallel direction of the upper rotating frame 7. The sensor positioning seats 12 are used to position the sensor.

[0046] The support ring 4 pre-installed with the O-ring seal 6 is moved to the bottom of one of the positioning guide posts 8 of the feeding and pressing mechanism. At this time, the support ring 4 is lifted upward. Under the uniform thrust of the support ring 4, the O-ring seal 6 is pushed upward smoothly and synchronously along the tapered surface of the expanding diameter tapered sleeve 82 to the lower end of the gauge-maintaining pressing assembly 9. The tapered structure design of the expanding diameter tapered sleeve 82, which is narrow at the bottom and wide at the top, makes the seal ring expand radially evenly and synchronously, so that it can be smoothly fitted onto the gauge-maintaining post 81. The seal ring is in a slightly expanded state.

[0047] This process does not directly clamp the elastic body of the sealing ring itself. Instead, it uses an expanding conical sleeve 82 and a diameter-maintaining column 81 to expand the diameter, allowing the sealing ring to be pushed to the target position in a constrained, coaxial, and uniformly stressed environment. This achieves a paradigm shift from "clamping" to "guiding," ensuring that all points on the circumference of the sealing ring expand radially simultaneously and equally, avoiding local stress concentration and distortion caused by asynchronous deformation. The O-ring 6 is positioned by non-destructive diameter expansion.

[0048] By employing diameter expansion positioning, the sealing ring is ultimately positioned on the precisely sized expansion column, the inner diameter of which is determined by the expansion column. This provides an extremely stable and highly coaxial reference position, ensuring perfect alignment with the sensor positioning seat 12 during subsequent press-fitting.

[0049] After positioning, the downward push support ring 4 rotates the expanded diameter positioning O-ring 6 to above the sensor positioning seat 12 of the rotary disk 11. At this time, the pressing cylinder 10 drives the diameter-maintaining pressing assembly 9 downward to put the lower rotating frame 2 into the sensor, realizing highly reliable automated assembly.

[0050] The material handling mechanism, the feeding and pressing mechanism, and the sensor positioning mechanism all operate in parallel with two workstations, making them suitable for high-speed automated production lines.

[0051] Example 2: This example is based on Example 1, and the structure of the gauge-maintaining press-fit assembly 9 is improved. The specific contents include:

[0052] Please see Figures 7-13 The gauge-keeping press-fit assembly 9 includes a hollow ring 91 that is movably sleeved on the gauge-keeping column 81. The inner ring of the hollow ring 91 has an annular reserved groove with an opening at the lower end. An electromagnetic ring 94 is embedded in the top of the annular reserved groove. A magnetic gauge-keeping sleeve 92 is installed on the bottom wall of the electromagnetic ring 94 through an elastic ring 93. The magnetic gauge-keeping sleeve 92 is movably and sealingly sleeved on the gauge-keeping column 81. An annular magnetic sheet matching the electromagnetic ring 94 is embedded in the top wall of the magnetic gauge-keeping sleeve 92.

[0053] The outer end of the magnetic retaining sleeve 92 is provided with a retaining ring cavity whose bottom end matches the inner ring structure of the O-ring seal 6. The lower end wall of the retaining ring cavity extends downward towards the top of the expanding tapered sleeve 82 and is seamlessly connected to the outer wall of the top of the expanding tapered sleeve 82. In the initial state, the magnetic retaining sleeve 92 is pushed out of the bottom of the hollow ring 91 under the elastic action of the elastic ring 93, and the top wall of the retaining ring cavity is flush with the bottom wall of the hollow ring 91.

[0054] The support ring 4 pre-installed with the O-ring 6 is moved to the bottom of one of the positioning guide posts 8 of the feeding and pressing mechanism. At this time, the support ring 4 is lifted upward. Under the uniform thrust of the support ring 4, the O-ring 6 is pushed upward smoothly and synchronously along the tapered surface of the expanding tapered sleeve 82 into the diameter-keeping ring cavity of the magnetic diameter-keeping sleeve 92. The tapered surface guidance and uniform diameter expansion ensure no twisting. The magnetic diameter-keeping sleeve 92 and the hollow ring 91 together play a limiting role for the O-ring 6, realizing the non-destructive diameter expansion and positioning of the O-ring 6.

[0055] During the pressing assembly of the gauge-maintaining assembly 9, the gauge-maintaining ring cavity of the magnetic gauge-maintaining sleeve 92 continuously expands the O-ring seal 6, thus maintaining the gauge of the O-ring seal 6. This allows the O-ring seal 6 to be smoothly lowered to the sensor's sealing position. Finally, by activating the electromagnetic ring 94, the electromagnetic ring 94 magnetically attracts the magnetic gauge-maintaining sleeve 92, causing the magnetic gauge-maintaining sleeve 92 to compress the elastic ring 93 upwards until it detaches from the O-ring seal 6. At this point, the O-ring seal 6 retracts back to its natural state and accurately falls into the sensor's sealing groove, achieving a flexible assembly with almost zero damage.

[0056] In summary: a material handling mechanism adapted to the feeding plate of the vibrating feeder 1 and a feeding pressing mechanism adapted to the material handling mechanism are set up. The O-ring 6 is horizontally conveyed by the conveyor plate 101 to the material support groove 401 on the support ring 4 for initial pre-installation.

[0057] Next, the support ring 4, pre-installed with the O-ring seal 6, is pushed upward. Under the uniform thrust of the support ring 4, the O-ring seal 6 is smoothly and synchronously pushed upward along the conical surface of the expanding conical sleeve 82. It does not directly clamp the elastic body of the seal ring itself, allowing the seal ring to be pushed to the magnetic diameter-maintaining sleeve 92 of the diameter-maintaining pressing assembly 9 for target positioning in a constrained, coaxial, and uniformly stressed state. This process avoids local stress concentration and torsion caused by asynchronous deformation, achieving non-destructive diameter expansion and positioning. In conjunction with the downward-driven diameter-maintaining pressing assembly 9, during the downward pressing assembly process, the O-ring seal 6 is pushed down unimpeded to the sensor's sealing position. Finally, the electromagnetic ring 94 elastically resets the magnetic diameter-maintaining sleeve 92 upward, causing it to detach from the O-ring seal 6. At this time, it retracts back to its natural state and accurately falls into the sensor's sealing groove, achieving a flexible assembly with almost zero damage.

[0058] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto; any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in the present invention, based on the technical solution and its improved concept, should be covered within the scope of protection of the present invention.

Claims

1. A high-reliability automotive-grade pressure sensor O-ring automatic press-fitting machine, characterized in that: It includes a vibrating feeder (1) installed on the pressing table and interconnected with each other, a material taking mechanism, a material feeding and pressing mechanism, and a sensor positioning mechanism. The discharge port of the vibrating feeder (1) is fitted with a conveyor plate (101) with a docking material taking mechanism for feeding O-ring seals (6). The material handling mechanism includes a lower rotating frame (2) that is rotated and installed on the assembly table. Material handling guide columns (3) are fixed at both ends of the lower rotating frame (2). Each pair of material handling guide columns (3) is driven to lift and lower to support rings (4) for docking with the conveying port of the conveying plate (101) and the feeding and pressing mechanism. The top of the support ring (4) is provided with a material receiving groove (401) for accommodating O-ring seals (6). The material receiving groove (401) is provided with a push port (402) on the side facing the conveying plate (101). The feeding and pressing mechanism includes a fixed bracket and an upper rotating frame (7) that is mounted on the fixed bracket and is located away from the conveyor plate (101) and perpendicular to one of the picking guide columns (3). The upper rotating frame (7) has positioning guide columns (8) at its front and rear lower ends, corresponding to the positions of the picking guide columns (3). The positioning guide column (8) includes a gauge-maintaining column (81) and an expanding conical sleeve (82) that are connected vertically. The outer diameter of the gauge-maintaining column (81) is larger than the inner diameter of the O-ring seal (6), and the outer diameter of the expanding conical sleeve (82) gradually increases from bottom to top. A gauge-maintaining pressing assembly (9) that is movably sleeved with the gauge-maintaining column (81) is installed on the gauge-maintaining column (81). The gauge-keeping press-fit assembly (9) includes a hollow ring (91) movably fitted onto the gauge-keeping column (81). The inner ring of the hollow ring (91) has an annular pre-reserved groove with an opening at the lower end. An electromagnetic ring (94) is embedded in the top of the annular pre-reserved groove. A magnetic gauge-keeping sleeve (92) is installed on the bottom wall of the electromagnetic ring (94) through an elastic ring (93). The magnetic gauge-keeping sleeve (92) is movably and sealingly fitted onto the gauge-keeping column (81). The outer end of the magnetic gauge-keeping sleeve (92) has a gauge-keeping ring cavity whose bottom end matches the inner ring structure of the O-ring seal (6). The lower end wall of the gauge-keeping ring cavity extends downward towards the top of the expanding tapered sleeve (82) and is seamlessly connected to the outer wall of the top of the expanding tapered sleeve (82).

2. The automatic press-fitting machine for high-reliability automotive-grade pressure sensor O-rings according to claim 1, characterized in that: The material guide post (3) includes a tapered sleeve (32) with a reduced diameter and a hollow post (31) arranged at the top and bottom. The outer diameter of the hollow post (31) is consistent with the inner diameter of the O-ring seal (6). The outer diameter of the hollow post (31) gradually decreases from bottom to top.

3. The automatic press-fitting machine for high-reliability automotive-grade pressure sensor O-rings according to claim 2, characterized in that: The supporting ring (4) is movably mounted on the hollow column (31) through the lifting frame. The hollow column (31) is equipped with a top support cylinder (5) for driving the lifting frame to lift. The conveying port of the conveying plate (101) is provided with an arc-shaped matching groove that is compatible with the outer ring structure of the supporting ring (4).

4. The automatic press-fitting machine for high-reliability automotive-grade pressure sensor O-rings according to claim 3, characterized in that: Both sides of the arc-shaped matching groove are fixedly installed with inclined guide plates that connect with both sides of the push port (402), and the upper end face of the reduced diameter tapered sleeve (32) and the material support groove (401) is flush with the conveying surface of the conveying plate (101).

5. The automatic press-fitting machine for high-reliability automotive-grade pressure sensor O-rings according to claim 1, characterized in that: The conveying plate (101) is provided with a limiting component at the conveying port, which includes a bracket fixedly installed at the lower end of the conveying port of the conveying plate (101), and a pair of limiting sheaths (103) that penetrate the conveying plate (101) are installed on the bracket by a limiting push rod (102).

6. The automatic press-fitting machine for high-reliability automotive-grade pressure sensor O-rings according to claim 1, characterized in that: The gauge-maintaining press assembly (9) is movably mounted on the gauge-maintaining column (81) via a pusher frame. The top of the upper rotating frame (7) is fixedly mounted with a press-fitting cylinder (10) that penetrates into the gauge-maintaining column (81) and is used to drive the pusher frame to lift.

7. The automatic press-fitting machine for high-reliability automotive-grade pressure sensor O-rings according to claim 1, characterized in that: The sensor positioning mechanism includes a rotary disk (11) mounted on the assembly table, and a pair of sensor positioning seats (12) corresponding to the positions of the positioning guide posts (8) are mounted on the rotary disk (11).

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