Pressing mechanism, shell-entering device and multi-station shell-entering equipment

Abstract

The application discloses a pressing mechanism, a shell-entering device and a multi-station shell-entering equipment. The pressing mechanism comprises a mounting frame and a push rod assembly. The push rod assembly comprises a rod piece, a sliding sleeve, a pressure sensor, a pressing plate and a magnetic attraction piece. The rod piece extends along a first direction and is slidingly connected to the mounting frame. The sliding sleeve is sleeved and slidingly connected to the rod piece. The sliding sleeve is provided with a first limiting surface. The first limiting surface and the pressing plate are respectively located on two sides of the pressure sensor along the first direction. The magnetic attraction piece is located on a side of the pressure sensor away from the first limiting surface. The magnetic attraction piece is suitable for being magnetically connected with the sliding sleeve. The pressing plate is suitable for moving under the driving of an external force to press the pressure sensor and drive the rod piece to move through the sliding sleeve and the magnetic attraction piece. The magnetic attraction force between the magnetic attraction piece and the sliding sleeve is less than or equal to the maximum detection value of the pressure sensor. In combination with the separable characteristic of the magnetic attraction connection, the transmission path of the force can be automatically cut off when the pressing process is stuck, so that the pressure sensor is prevented from being damaged due to the sharp increase of the pressure.

Description

Technical Field

[0001] This invention relates to the field of automated assembly equipment technology, and in particular to a pressing mechanism, a shell-insertion device, and a multi-station shell-insertion device. Background Technology

[0002] In automated production processes, many products require press-fitting (such as power battery assembly and sensor assembly).

[0003] Taking power batteries as an example, as a core component of the new energy vehicle industry, the manufacturing quality and safety of power batteries are of great concern. During battery manufacturing, the cells typically need to be pressed into the steel casing under certain pressure to achieve tight assembly. In existing technologies, a pressure sensor is often installed behind the press head to monitor the pressure value in real time during the pressing process, ensuring that the pressing force is within a controllable range, thereby guaranteeing the assembly quality and consistency of the battery.

[0004] However, in actual production, due to factors such as cell size deviation, burrs on the inner wall of the steel shell, or misalignment during assembly, jamming can easily occur between the cell and the steel shell. When jamming occurs, the pressure head continues to apply pressure, causing the pressure on the pressure sensor to rise sharply, often momentarily exceeding its range or maximum detection value, which can easily damage the pressure sensor. Summary of the Invention

[0005] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes a pressing mechanism, a shell insertion device, and a multi-station shell insertion equipment, which can transmit the driving force of the pressing plate to the rod to press the product through the magnetic attraction of the magnetic suction component and the sliding sleeve. When the product assembly is stuck, the magnetic suction component disengages from the sliding sleeve, releasing the driving force of the pressing plate on the rod, so that the pressure on the pressure sensor is always within the detection range, thus protecting the pressure sensor.

[0006] On one hand, embodiments of the present invention provide a pressing mechanism, comprising: Mounting rack; A push rod assembly includes a rod, a sliding sleeve, a pressure sensor, a pressure plate, and a magnetic attractor. The rod extends along a first direction and is slidably connected to the mounting bracket. The sliding sleeve is fitted onto and slidably connected to the rod. The sliding sleeve has a first limiting surface, which, along with the pressure plate, is located on both sides of the pressure sensor along the first direction. The magnetic attractor is fixed to the rod and located on the side of the pressure sensor opposite to the first limiting surface. The magnetic attractor is adapted to magnetically connect with the sliding sleeve. The pressure plate is adapted to move under the drive of an external force to press against the pressure sensor, thereby moving the rod via the sliding sleeve and the magnetic attractor. Wherein, the magnetic attraction force between the magnetic attractor and the sliding sleeve is less than or equal to the maximum detection value of the pressure sensor.

[0007] According to some embodiments of the present invention, the pressure plate is sleeved and slidably connected to the sliding sleeve; The pressure sensor is an annular pressure sensor, and the sliding sleeve passes through the central through hole of the annular pressure sensor. The first limiting surface is an annular surface surrounding the axis of the sliding sleeve.

[0008] According to some embodiments of the present invention, a sensor placement groove is formed by a partial surface depression of the pressure plate, and a stop member is connected to the pressure plate. The stop member is located around the opening of the sensor placement groove, and the projection of the stop member on the orthographic projection in the first direction at least partially coincides with the projection of the pressure sensor.

[0009] According to some embodiments of the present invention, the rod includes a main rod segment and an installation rod segment with successively decreasing diameters. The installation rod segment is connected to a limit nut. The magnetic suction member is sleeved on the installation rod segment and fixed between the shoulder of the main rod segment and the limit nut.

[0010] According to some embodiments of the present invention, the first direction is set at an angle to the horizontal plane, and the magnetic suction member is disposed below the pressure sensor along the first direction.

[0011] According to some embodiments of the present invention, the push rod assembly further includes a damping sleeve, which is sleeved on the rod and located on the side of the sliding sleeve opposite to the magnetic attractor; the frictional force between the damping sleeve and the rod is greater than the frictional force between the sliding sleeve and the rod.

[0012] According to some embodiments of the present invention, the pressing mechanism further includes a support component fixed to the mounting frame. The support component is disposed below the rod along the first direction and is used to limit and support the rod or the magnetic suction component.

[0013] According to some embodiments of the present invention, the pressing mechanism further includes a range extender, the range extender including a fixed rack, a movable rack and a gear set, the fixed rack being fixed to the mounting bracket and extending along the first direction; the gear set including at least one gear, the input end of the gear set meshing with the fixed rack, the output end of the gear set meshing with the movable rack, the movable rack extending along the first direction and connected to the pressing plate; The gear set is adapted to move up and down along the first direction under the drive of an external force.

[0014] Secondly, embodiments of the present invention also provide an insertion device, including the pressing mechanism described above.

[0015] Thirdly, embodiments of the present invention also provide a multi-station housing insertion device, comprising: The pressure-reducing mechanism as described above; A drive cylinder shaft, the axis of which extends along the first direction, a first cam groove is provided on the surface of the drive cylinder shaft, and a plurality of the pressing mechanisms are arranged around the circumference of the drive cylinder shaft; The gear set is connected to a first roller, which is slidably connected to the first cam groove. The drive cylinder shaft is adapted to rotate under external force to drive the first cam groove to rotate, and to drive the gear set to move along the first direction through the first roller.

[0016] The embodiments of the present invention have at least the following beneficial effects: by setting up a magnetic attraction component and a sliding sleeve for magnetic attraction connection to realize the transmission of external force, combined with the characteristic that the magnetic attraction connection can be separated after exceeding the threshold of magnetic attraction force, the force transmission path can be automatically cut off when jamming occurs during the pressing process, fundamentally preventing the pressure sensor from being damaged due to a sudden increase in pressure, and significantly reducing equipment maintenance costs; at the same time, since the pressure sensor always works within the safe range, the data reliability of the pressing process is guaranteed; and the force transmission is directly adopted by a hard connection, eliminating the traditional constant force spring and reducing equipment maintenance costs.

[0017] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of the pressing mechanism according to an embodiment of the present invention; Figure 2 This is a partial cross-sectional view along plane ZX of the pressing mechanism according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of the multi-station shell insertion device according to an embodiment of the present invention; Figure 4 for Figure 3 A magnified view of part A in the middle; Figure 5 This is a schematic diagram of the housing device according to an embodiment of the present invention.

[0019] Figure label: 20. Drive cylinder shaft; 21. First cam groove; 100. Mounting bracket; 300. Push rod assembly; 310. Rod; 311. Main rod section; 312. Mounting rod section; 313. Limiting nut; 320. Sliding sleeve; 321. First limiting surface; 330. Pressure sensor; 340. Pressure plate; 341. Sensor placement slot; 342. Stop; 350. Magnetic suction component; 360. Damping sleeve; 600. Support components; 700. Range extender assembly; 710. Fixed rack; 720. Movable rack; 730. Gear set; 910. The first roller. Detailed Implementation

[0020] Embodiments of the present invention 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 the present invention, and should not be construed as limiting the present invention.

[0021] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention 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 limiting this invention.

[0022] In the description of this invention, "several" means one or more, "multiple" means two or more, "greater than," "less than," "exceeding," etc. are understood to exclude the stated number, and "above," "below," "within," etc. are understood to include the stated number. If "first," "second," etc. are used in the description, they are only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the order of the indicated technical features.

[0023] In the description of this invention, unless otherwise explicitly defined, terms such as "set", "install", and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0024] Please refer to Figure 1 and Figure 2As shown, in one aspect, an embodiment of the present invention provides a pressing mechanism for placing an element into the interior of a receiving component. It should be noted that the element can be a battery cell, and the receiving component can be a steel shell. The steel shell can be generally cylindrical, with an opening at one end through which the battery cell enters the interior of the steel shell. Of course, in other embodiments, the element and the receiving component can be other components, which are not limited here.

[0025] The pressing mechanism includes a mounting frame 100 and a push rod assembly 300. The push rod assembly 300 includes a rod 310, a sliding sleeve 320, a pressure sensor 330, a pressing plate 340, and a magnetic attractor 350. The rod 310 extends along a first direction (Z direction in the figure) and is slidably connected to the mounting frame 100. The sliding sleeve 320 is fitted onto and slidably connected to the rod 310. The sliding sleeve 320 is provided with a first limiting surface 321. The first limiting surface 321 and the pressing plate 340 are respectively located at the pressure sensor along the first direction. The pressure sensor 330 is located on both sides of the rod 310 and is fixed to the rod 310. The magnetic suction member 350 is located on the side of the pressure sensor 330 away from the first limiting surface 321. The magnetic suction member 350 is adapted to be magnetically connected to the sliding sleeve 320. The pressure plate 340 is adapted to move under the drive of external force to press against the pressure sensor 330. The rod 310 is moved by the sliding sleeve 320 and the magnetic suction member 350. The magnetic attraction force between the magnetic suction member 350 and the sliding sleeve 320 is less than or equal to the maximum detection value of the pressure sensor 330.

[0026] According to the pressing mechanism of the present invention, during the pressing process, an external force pushes the pressing plate 340, which presses the pressure sensor 330. The pressure sensor 330 transmits the force sequentially to the sliding sleeve 320 and the magnetic suction member 350. Since the magnetic suction member 350 and the sliding sleeve 320 are connected by magnetic attraction, the entire rod 310 is moved, thereby smoothly pressing the component into the receiving component. When the component and the receiving component become stuck, the rod 310 is blocked and cannot continue to move forward, while the pressing plate 340 continues to apply pressure under the action of external force. The pressure on the pressure sensor 330 increases rapidly until it exceeds the magnetic attraction between the magnetic suction member 350 and the sliding sleeve 320. The magnetic suction member 350 then automatically separates from the sliding sleeve 320. At this time, the external force can no longer be transmitted to the rod 310 through the pressure sensor 330, and the pressure sensor 330 no longer bears higher pressure, thereby avoiding overload damage.

[0027] According to the pressing mechanism of the present invention, external force is transmitted by magnetically connecting the magnetic suction component 350 and the sliding sleeve 320. Combined with the characteristic that the magnetic connection can be separated after exceeding the threshold of magnetic force, the force transmission path can be automatically cut off when jamming occurs during the pressing process, fundamentally preventing the pressure sensor 330 from being damaged due to a sudden increase in pressure, and significantly reducing equipment maintenance costs. At the same time, since the pressure sensor 330 always operates within a safe range, the data reliability of the pressing process is guaranteed. Furthermore, the force transmission is directly achieved through a hard connection, eliminating the need for a traditional constant force spring and reducing equipment maintenance costs.

[0028] In this embodiment, the pressure sensor 330 can be connected to an external data acquisition device to record and monitor the pressure value of each press-fitting operation in real time.

[0029] In this embodiment, when the first direction is vertical, the preset magnetic attraction force is greater than or equal to twice the weight of the magnetic component 350 + the weight of the component + the frictional force of the pressing mechanism. The pressing mechanism is in normal working condition. Each time the pressing assembly action is completed, the pressure sensor 330 will output the actual pressure during assembly. Based on the real-time pressure, if the actual pressure output by the pressure sensor 330 is greater than the set pressure value, it is determined that the end face of the component is at risk of being damaged and manual re-inspection is required; if the actual pressure output by the pressure sensor 330 is less than the set pressure value, it is determined that the end face of the component is not at risk of being damaged, and the assembled product flows normally to the next process.

[0030] In some embodiments, combined with Figure 1 and Figure 2 As shown, the pressure plate 340 is sleeved and slidably connected to the sliding sleeve 320; the pressure sensor 330 is an annular pressure sensor, the sliding sleeve 320 passes through the central through hole of the annular pressure sensor, and the first limiting surface 321 is an annular surface surrounding the axis of the sliding sleeve 320.

[0031] In this embodiment, the sliding sleeve 320 passes through the central through hole of the annular pressure sensor, so that the pressure sensor 330 and the sliding sleeve 320 are arranged coaxially, resulting in a highly compact structure and preventing the pressure sensor 330 from detaching from the first limiting surface 321 and the pressure plate 340. Secondly, when the pressure plate 340 slides along the sliding sleeve 320, the clamping force borne by the pressure sensor 330 is evenly distributed in the central area, avoiding measurement errors or local stress concentration caused by eccentric loads. At the same time, the annular surface, as the first limiting surface 321, forms a stable surface contact with the end face of the annular pressure sensor, resulting in smooth force transmission and good centering, further improving the accuracy and repeatability of pressure detection.

[0032] In some embodiments, combined with Figure 1 and Figure 2As shown, a sensor placement groove 341 is formed by a partial surface depression of the pressure plate 340. The pressure plate 340 is connected to a stop member 342, which is located around the opening of the sensor placement groove 341. The projection of the stop member 342 on the orthographic projection in the first direction at least partially overlaps with the projection of the pressure sensor 330.

[0033] In this embodiment, the sensor placement slot 341 can radially limit the pressure sensor 330 to prevent it from shifting or rotating during operation, ensuring that the annular pressure sensor and the sliding sleeve 320 remain coaxial, thereby improving the stability and accuracy of pressure detection. The stop 342 also limits the pressure sensor 330 axially, preventing the pressure sensor 330 from accidentally falling off or becoming misaligned from the pressure plate 340 after the magnetic suction 350 separates from the sliding sleeve 320, ensuring that the pressure sensor 330 is still in the correct working position during reset or the next press-fit. Moreover, when the pressure plate 340 retracts, the stop 342 can drive the pressure sensor 330 to retract synchronously, achieving automatic reset of the pressure sensor 330 without additional parts.

[0034] In this embodiment, the stop 342 can be a screw, which is threadedly connected to the pressure plate 340 and limits the pressure sensor 330 through a nut.

[0035] In some embodiments, combined with Figure 1 and Figure 2 As shown, the rod 310 includes a main rod section 311 with a diameter decreasing sequentially and an installation rod section 312. The installation rod section 312 is connected to a limit nut 313. The magnetic suction member 350 is sleeved on the installation rod section 312 and fixed between the shoulder of the main rod section 311 and the limit nut 313.

[0036] In this embodiment, the shoulder and the limiting nut 313 form a stable axial clamping structure, which can firmly fix the magnetic 350 to the rod 310 without machining threads or using adhesive on the magnetic 350, ensuring that it does not loosen or shift during repeated pressing and separating actions. By replacing the magnetic 350 with different thicknesses or magnetic strengths, and by adjusting the limiting nut 313, the magnetic force threshold can be flexibly set to adapt to the pressing force requirements of different pressing conditions.

[0037] Of course, the magnetic component 350 can also be installed onto the rod 310 by means of adhesive bonding, snap-fit ​​connection, etc.

[0038] In some embodiments, combined with Figure 1 and Figure 2 As shown, the first direction is set at an angle to the horizontal plane, and the magnetic suction member 350 is set below the pressure sensor 330 along the first direction.

[0039] In this embodiment, when the pressing process becomes stuck, causing the magnetic chuck 350 to separate from the sliding sleeve 320, the rod 310 (including the magnetic chuck 350) loses the upward or upward magnetic attraction constraint from the sliding sleeve 320. Under its own gravity, it will automatically fall downward in the first direction, thereby quickly detaching from contact with the component. This spontaneous falling action can promptly relieve the continuous pressure of the rod 310 on the component, preventing deformation of the component or housing.

[0040] In this embodiment, the first direction is the vertical direction. In other embodiments, the first direction can also be set at an angle to the horizontal plane to ensure that after the magnetic suction component 350 separates from the sliding sleeve 320, the rod 310 can fall automatically under the action of gravity.

[0041] In some embodiments, combined with Figure 1 and Figure 2 As shown, the push rod assembly 300 also includes a damping sleeve 360, which is sleeved on the rod 310 and located on the side of the sliding sleeve 320 away from the magnetic attractor 350; the friction between the damping sleeve 360 ​​and the rod 310 is greater than the friction between the sliding sleeve 320 and the rod 310.

[0042] In this embodiment, when the magnetic suction member 350 separates from the sliding sleeve 320, the rod 310 loses its magnetic constraint and may fall rapidly in the first direction under the action of gravity. At this time, since there is a large friction between the damping sleeve 360 ​​and the rod 310, the moving speed of the rod 310 can be effectively slowed down, avoiding the rod 310 from falling instantly or sliding at high speed and causing a violent impact, thus protecting the pressing mechanism.

[0043] In some embodiments, combined with Figure 1 and Figure 2 As shown, the pressing mechanism also includes a support component 600, which is fixed to the mounting bracket 100. The support component 600 is arranged below the rod 310 along the first direction and is used to limit the support rod 310 or the magnetic suction component 350.

[0044] In this embodiment, when the magnetic suction component 350 separates from the sliding sleeve 320, and the rod 310 falls downward along the first direction under the action of gravity, the support component 600 can reliably block and limit the rod 310 or the magnetic suction component 350 at a preset position, preventing the rod 310 from falling excessively or even completely detaching from the mounting frame 100, thus avoiding the loss or misalignment of parts.

[0045] In this embodiment, the support component 600 may include a soft material layer with cushioning function, such as a silicone pad or a rubber pad.

[0046] In some embodiments, combined with Figure 1 and Figure 2As shown, the pressing mechanism also includes a range extender 700, which includes a fixed rack 710, a movable rack 720, and a gear set 730. The fixed rack 710 is fixed to the mounting bracket 100 and extends along a first direction. The gear set 730 includes at least one gear. The input end of the gear set 730 meshes with the fixed rack 710, and the output end of the gear set 730 meshes with the movable rack 720. The movable rack 720 extends along the first direction and is connected to the pressing plate 340. The gear set 730 is adapted to move up and down along the first direction under the drive of an external force.

[0047] In this embodiment, utilizing the meshing relationship between the gear set 730, the fixed rack 710, and the movable rack 720, when the external drive mechanism pushes the gear set 730 to move a certain distance in the first direction, the gear set 730 rolls on the fixed rack 710, causing the movable rack 720 to move in the same direction relative to the gear set 730. This makes the absolute movement distance of the movable rack 720 (and the pressure plate 340 connected to it) equal to twice the movement distance of the gear set 730 (if the gear set 730 uses a single equal-diameter gear), thereby achieving a stroke multiplication. The pressure plate 340 can achieve a larger pressing stroke within a limited space.

[0048] In other embodiments, the distance of the stroke multiplication is adjusted by changing the number of gears and the transmission ratio in the gear set 730.

[0049] Secondly, embodiments of the present invention also provide a casing insertion device, including the pressing mechanism as described in the above embodiments. The beneficial effects of the casing insertion device in this embodiment are the same as those of the pressing mechanism in the above embodiments, and will not be repeated here.

[0050] Thirdly, combining Figures 3 to 5 As shown, this embodiment of the invention also provides a multi-station housing insertion device, including a pressing mechanism as described in the above embodiment, and a drive cylinder shaft 20; the axis of the drive cylinder shaft 20 extends along a first direction, a first cam groove 21 is provided on the surface of the drive cylinder shaft 20, and a plurality of pressing mechanisms are arranged around the circumference of the drive cylinder shaft 20; a gear set 730 is connected to a first roller 910, the first roller 910 is slidably connected to the first cam groove 21, the drive cylinder shaft 20 is adapted to rotate under external force to drive the first cam groove 21 to rotate, and drive the gear set 730 to move along the first direction through the first roller 910.

[0051] In this embodiment, when the multi-station housing insertion device is working, the drive cylinder shaft 20 rotates under external force. The first cam groove 21 on its surface drives the gear set 730 to move up and down in the first direction through the first roller 910. During the lifting process, the gear set 730 rotates due to meshing with the fixed rack 710, thereby driving the movable rack 720 meshing with it and the connected pressure plate 340 to move in the same direction with a doubled stroke. The pressure plate 340 pushes the pressure sensor 330, the sliding sleeve 320 and the magnetic suction component 350. Under normal conditions, the magnetic suction force drives the rod 310 to press the battery cell into the steel shell. When the pressing jams and the pressure increases sharply and exceeds the preset magnetic suction force, the magnetic suction component 350 and the sliding sleeve 320 automatically separate, cutting off the force transmission path. At the same time, the drive cylinder shaft 20 continues to rotate, only causing the gear set 730 to move in the idle stroke, thereby protecting the pressure sensor 330 and the pressed product.

[0052] In this embodiment, the drive is achieved through the cooperation of the first cam groove 21 and the first roller 910, which enables multiple pressing mechanisms to be installed on the side of the drive cylinder shaft 20. The operation of multiple pressing mechanisms can be achieved simultaneously by simply driving the drive cylinder shaft 20 to rotate, which effectively improves work efficiency.

[0053] In other embodiments, the gear set 730 can also be driven by a cylinder, a lead screw module, a slide module, etc.

[0054] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention 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 invention.

Claims

1. A pressure-absorbing mechanism, characterized in that, include: Mounting bracket (100); The push rod assembly (300) includes a rod (310), a sliding sleeve (320), a pressure sensor (330), a pressure plate (340), and a magnetic attractor (350). The rod (310) extends along a first direction and is slidably connected to the mounting bracket (100). The sliding sleeve (320) is fitted onto and slidably connected to the rod (310). The sliding sleeve (320) is provided with a first limiting surface (321). The first limiting surface (321) and the pressure plate (340) are respectively located along the first direction at... The pressure sensor (330) is located on both sides; the magnetic suction member (350) is fixed to the rod (310) and is located on the side of the pressure sensor (330) opposite to the first limiting surface (321); the magnetic suction member (350) is adapted to be magnetically connected to the sliding sleeve (320); the pressure plate (340) is adapted to move under the drive of external force to press against the pressure sensor (330), and the rod (310) is moved through the sliding sleeve (320) and the magnetic suction member (350); The magnetic attraction force between the magnetic attractor (350) and the sliding sleeve (320) is less than or equal to the maximum detection value of the pressure sensor (330).

2. The pressing mechanism according to claim 1, characterized in that, The pressure plate (340) is sleeved and slidably connected to the sliding sleeve (320). The pressure sensor (330) is an annular pressure sensor, and the sliding sleeve (320) passes through the central through hole of the annular pressure sensor. The first limiting surface (321) is an annular surface surrounding the axis of the sliding sleeve (320).

3. The pressing mechanism according to claim 2, characterized in that, The pressure plate (340) has a partial surface depression to form a sensor placement groove (341). The pressure plate (340) is connected to a stop (342). The stop (342) is located around the opening of the sensor placement groove (341), and the projection of the stop (342) on the orthographic projection in the first direction at least partially coincides with the projection of the pressure sensor (330).

4. The pressing mechanism according to claim 1, characterized in that, The rod (310) includes a main rod segment (311) and an installation rod segment (312) with decreasing diameters. The installation rod segment (312) is connected to a limit nut (313). The magnetic suction member (350) is sleeved on the installation rod segment (312) and fixed between the shoulder of the main rod segment (311) and the limit nut (313).

5. The pressing mechanism according to any one of claims 1 to 4, characterized in that, The first direction is set at an angle to the horizontal plane, and the magnetic suction element (350) is set below the pressure sensor (330) along the first direction.

6. The pressing mechanism according to claim 5, characterized in that, The push rod assembly (300) further includes a damping sleeve (360), which is sleeved on the rod (310) and located on the side of the sliding sleeve (320) away from the magnetic attractor (350); the friction between the damping sleeve (360) and the rod (310) is greater than the friction between the sliding sleeve (320) and the rod (310).

7. The pressing mechanism according to claim 5, characterized in that, The pressing mechanism further includes a support component (600) fixed to the mounting bracket (100). The support component (600) is disposed below the rod (310) along the first direction and is used to limit and support the rod (310) or the magnetic suction component (350).

8. The pressing mechanism according to claim 5, characterized in that, The pressing mechanism further includes a range extender (700), which includes a fixed rack (710), a movable rack (720), and a gear set (730). The fixed rack (710) is fixed to the mounting bracket (100) and extends along the first direction. The gear set (730) includes at least one gear. The input end of the gear set (730) meshes with the fixed rack (710), and the output end of the gear set (730) meshes with the movable rack (720). The movable rack (720) extends along the first direction and is connected to the pressing plate (340). The gear set (730) is adapted to move up and down along the first direction under the drive of an external force.

9. A casing insertion device, characterized in that, Includes the pressure-reducing mechanism as described in any one of claims 1 to 8.

10. A multi-station shell-loading device, characterized in that, include: The pressing mechanism as described in claim 8; A drive cylinder shaft (20) has its axis extending along the first direction. A first cam groove (21) is provided on the surface of the drive cylinder shaft (20). A plurality of the pressing mechanisms are arranged around the drive cylinder shaft (20) in the circumferential direction. The gear set (730) is connected to a first roller (910), which is slidably connected to the first cam groove (21). The drive cylinder shaft (20) is adapted to rotate under external force to drive the first cam groove (21) to rotate, and drive the gear set (730) to move along the first direction through the first roller (910).

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