Oil cylinder and hot pressing device
By designing adjustment devices in oil cylinders and hot pressing devices to optimize load distribution, the high cost problem caused by increasing the thickness of the hot pressing movable table and hot plate in the prior art is solved, and high flatness and low cost production of PCB are achieved.
Patent Information
- Application Number
- CN202422821326.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-19
- Publication Date
- 2025-08-22
- Estimated Expiration
- 2034-11-19
AI Technical Summary
In the prior art, the flatness of the PCB is improved by increasing the thickness of the hot pressing movable table and the hot plate, resulting in higher manufacturing costs.
A oil cylinder and a hot pressing device are designed. By setting up an adjustment device on the connecting seat, adjusting the distribution of the piston output load, and optimizing the way the load is transferred to the hot pressing movable table, so as to reduce the contact strength of the hot pressing movable table during the stress process and avoid increasing the material thickness.
It improves the flatness of the PCB, enhances the deformation resistance of the hot pressing movable table, and reduces manufacturing costs.
Smart Images
Figure CN223257188U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of printed circuits, in particular to an oil cylinder and a hot pressing device. Background Art
[0002] During the PCB lamination process, hot presses are key equipment, ensuring PCB production quality by providing a high-temperature, high-pressure, and low-vacuum environment. The plunger cylinder, a core component of the hot press, provides the necessary pressure to form the PCB. Furthermore, with the rapid advancement of technology, PCB fabrication plants are placing increasing demands on the flatness of finished PCBs.
[0003] Prior art methods increase the thickness of the hot press platform and hot platen to improve their resistance to deformation under pressure, thereby enhancing the flatness of the PCB. However, this approach significantly increases the weight of the hot press, requiring a corresponding increase in its structural strength and resulting in higher manufacturing costs. Utility Model Content
[0004] The technical problem to be solved by the present invention is: in view of the problem that the flatness of PCB is improved by increasing the thickness of hot pressing movable table and hot plate in the prior art, the manufacturing cost is relatively high, and an oil cylinder and hot pressing device are provided.
[0005] In order to solve the above technical problems, on the one hand, an embodiment of the present utility model provides an oil cylinder, comprising a cylinder body, a piston and a connecting seat, wherein the cylinder body is provided with a cavity, the piston is provided in the cavity and can reciprocate along a first direction;
[0006] The connecting seat has a first end and a second end opposite to each other along the first direction, and the first end of the connecting seat is connected to the piston;
[0007] The second end of the connecting seat is connected to the hot pressing movable table. The connecting seat is provided with an adjustment device, which is used to adjust the distribution mode of the load output by the piston when it is transferred to the hot pressing movable table, so as to reduce the contact strength borne by the hot pressing movable table during the force application process.
[0008] Optionally, the second end of the connecting seat is connected to one end of the adjusting device, and the other end of the adjusting device is connected to the hot pressing movable table. Along the first direction, the projection area of the adjusting device on a preset plane perpendicular to the first direction is larger than the projection area of the piston on the preset plane.
[0009] Optionally, the adjusting device has an open groove and a connecting portion arranged around the open groove, the second end of the connecting seat is connected to one end of the connecting portion, and the other end of the connecting portion is connected to the hot pressing movable table. Along the first direction, the projection area of the connecting portion on the preset plane is larger than the projection area of the first end of the connecting seat on the preset plane; the projection area of the first end of the connecting seat on the preset plane is greater than or equal to the projection area of the piston on the preset plane.
[0010] Optionally, a raised portion is provided in the middle of the bottom of the open groove, and the raised portion is located inside the open groove.
[0011] Optionally, the piston includes a plunger and a plunger head, the plunger is provided in the cavity, and along the first direction, a projected area of the connecting portion on the preset plane is larger than a projected area of the plunger head on the preset plane, and a projected area of the plunger head on the preset plane is larger than or equal to a projected area of the plunger on the preset plane;
[0012] The plunger head has a third end and a fourth end opposite to each other along the first direction. The third end of the plunger head is connected to the plunger, and the fourth end of the plunger head is connected to the first end of the connecting seat, and the two can move relative to each other.
[0013] Optionally, the end surface of the first end of the connecting seat is a concave surface, and the end surface of the fourth end of the plunger head is a convex surface, the convex surface fits into the concave surface, and the concave surface and the convex surface can move relative to each other.
[0014] Optionally, the oil cylinder also includes a first fixed seat, which is connected to the first end of the connecting seat, and the first fixed seat has a first through hole, which passes through the first fixed seat along the first direction, and the plunger head is located in the first through hole, and a first gap is formed between the outer peripheral surface of the plunger head and the hole wall of the first through hole.
[0015] According to an embodiment of the present invention, the oil cylinder is in an inoperative state, with the piston located within the cylinder cavity. The first end of the connecting seat is connected to the piston, and the second end is connected to the hot pressing movable table. When the oil cylinder begins operating, the piston moves in a first direction (the axial direction of the cylinder), and this movement drives the connecting seat and the connected hot pressing movable table to move together. During the subsequent hot pressing process, the hot pressing movable table, driven by the oil cylinder, can cooperate with other components to perform hot pressing on the workpiece. Furthermore, after the load output by the piston is transferred to the connecting seat, an adjustment device changes the distribution of the load transferred to the hot pressing movable table. For example, a load that was originally concentrated in a small area can be dispersed, making the hot pressing movable table more evenly stressed, eliminating the original concentrated load state. This optimizes load distribution, enhances the hot pressing movable table's resistance to deformation during compression, and thus improves the flatness of the PCB. By optimizing the connecting seat structure to improve the hot pressing movable table's resistance to deformation, it avoids increasing material thickness, thereby reducing manufacturing costs.
[0016] On the other hand, an embodiment of the present invention provides a hot pressing device, including a mounting frame, a hot pressing movable platform, a first hot pressing plate, a second hot pressing plate and the above-mentioned oil cylinder, the cylinder body, the hot pressing movable platform and the second hot pressing plate are connected to the mounting frame, the connecting seat is connected to the hot pressing movable platform, the first hot pressing plate is connected to the side of the hot pressing movable platform away from the connecting seat, the first hot pressing plate and the second hot pressing plate are arranged at intervals along the first direction, the first hot pressing plate is suitable for carrying a PCB, and the piston drives the hot pressing movable platform to move along the first direction so that the PCB on the first hot pressing plate can be clamped between the first hot pressing plate and the second hot pressing plate.
[0017] Optionally, the hot pressing device also includes a second fixed seat, which is connected to the hot pressing movable table. The second fixed seat has a second through hole, which passes through the second fixed seat along the first direction. The connecting seat is located in the second through hole, and a second gap is formed between the outer peripheral surface of the connecting seat and the hole wall of the second through hole.
[0018] Optionally, the hot pressing device further includes a third hot pressing plate, which is located between the first hot pressing plate and the second hot pressing plate, and is suitable for carrying the PCB. The third hot pressing plate is slidably connected to the mounting frame, and the piston drives the third hot pressing plate to move through the hot pressing movable table, so that the PCB on the first hot pressing plate can be clamped between the first hot pressing plate and the third hot pressing plate, and the PCB on the third hot pressing plate can be clamped between the second hot pressing plate and the third hot pressing plate.
[0019] Optionally, there are multiple third hot pressing plates, and the multiple third hot pressing plates are arranged at intervals along the first direction. The piston drives all the third hot pressing plates to move along the first direction through the hot pressing movable table, so that the PCB on the first hot pressing plate can be clamped between the first hot pressing plate and the first third hot pressing plate, and the PCB on the last third hot pressing plate can be clamped between the second hot pressing plate and the last third hot pressing plate, and the PCBs on the remaining third hot pressing plates can be clamped between two adjacent third hot pressing plates.
[0020] According to the hot pressing device provided by the present invention, in the initial state, a certain distance is maintained between the first and second hot pressing plates. Once the PCB (printed circuit board) to be hot pressed is placed on the first hot pressing plate, the pressing device begins operation. The piston of the hydraulic cylinder moves in a first direction, pushing the first hot pressing plate (and the PCB mounted thereon) toward the second hot pressing plate. When the two contact, the hot pressing process begins. The second hot pressing plate may have been preheated to an appropriate temperature to ensure the necessary heat transfer during the hot pressing process. The PCB is evenly pressured and heated between the first and second hot pressing plates, achieving the desired flatness. The piston of the hydraulic cylinder then begins to move in the opposite direction, pulling the first hot pressing plate (and the PCB mounted thereon) back to its initial position. At this point, the operator or automated equipment can remove the hot-pressed PCB and prepare for the next hot pressing cycle. By optimizing the design of the hydraulic cylinder and connecting seat, the thickness of the hot pressing movable table and hot pressing platen is avoided, thereby reducing manufacturing costs. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 This is a schematic structural diagram of a hot pressing device provided in one embodiment of the present utility model;
[0022] Figure 2 yes Figure 1 sectional view of
[0023] Figure 3 yes Figure 2 A magnified view of A;
[0024] Figure 4 It is a structural schematic diagram of an oil cylinder provided in one embodiment of the utility model.
[0025] The reference numerals in the specification are as follows:
[0026] 100, oil cylinder; 200, hot pressing movable table; 300, first hot pressing plate; 400, second hot pressing plate; 500, mounting frame; 600, third hot pressing plate; 700, second fixing seat;
[0027] 1. Cylinder body; 2. Piston; 3. Connecting seat; 4. Cavity; 5. Opening groove; 6. First fixing seat; 21. Plunger; 22. Plunger head; 221. Convex surface; 31. Connecting part; 32. Raised part; 33. Concave surface. DETAILED DESCRIPTION
[0028] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.
[0029] like Figures 1 to 4 As shown, an embodiment of the present invention provides an oil cylinder 100, comprising a cylinder body 1, a piston 2 and a connecting seat 3, wherein the cylinder body 1 is provided with a cavity 4, the piston 2 is provided in the cavity 4 and can reciprocate along a first direction;
[0030] The connecting seat 3 has a first end and a second end opposite to each other along a first direction, and the first end of the connecting seat 3 is connected to the piston 2;
[0031] The second end of the connecting base 3 is connected to the hot pressing movable table 200. The connecting base 3 is equipped with an adjustment device for adjusting the distribution of the load output by the piston 2 when it is transferred to the hot pressing movable table 200, thereby reducing the contact strength experienced by the hot pressing movable table 200 during the load-bearing process. In this embodiment, the adjustment device adjusts the distribution of the load output by the piston 2 on the hot pressing movable table 200, effectively reducing the contact strength experienced by the hot pressing movable table 200 during the load-bearing process. This reduces deformation of the hot pressing movable table 200 during the pressing process, which helps improve the flatness of the PCB during pressing, thereby enhancing product quality.
[0032] In one embodiment, the second end of the connector 3 is connected to one end of the adjustment device, and the other end of the adjustment device is connected to the hot pressing movable platform 200. Along a first direction, the projected area of the adjustment device on a predetermined plane perpendicular to the first direction is larger than the projected area of the piston 2 on the predetermined plane. In this embodiment, the larger projected area of the adjustment device allows the load applied by the piston 2 to be more evenly distributed on the hot pressing movable platform 200, reducing local stress concentration. Due to the more even load distribution, the deformation of the hot pressing movable platform under load is reduced, which helps maintain the flatness of the PCB board during the pressing process. The first direction is the vertical direction. When the hot pressing movable platform 200 is square, the predetermined plane coincides with the lower side of the hot pressing movable platform 200.
[0033] In one embodiment, the adjustment device includes an open slot 5 and a connecting portion 31 disposed around the open slot 5. The second end of the connecting seat 3 is connected to one end of the connecting portion 31, and the other end of the connecting portion 31 is connected to the hot pressing movable table 200. Along a first direction, the projected area of the connecting portion 31 on a predetermined plane is greater than the projected area of the first end of the connecting seat 3 on the predetermined plane; and the projected area of the first end of the connecting seat 3 on the predetermined plane is greater than or equal to the projected area of the piston 2 on the predetermined plane. In this embodiment, the connecting portion 31 can be a side surface of the second end of the connecting seat 3, or it can be a structural member extending from the second end of the connecting seat 3, the structural member having a connection surface suitable for connecting to the hot pressing movable table 200. By designing the connecting portion 31 with a larger projected area at the second end of the connecting seat 3, compared to the projected area of the piston 2 on the same plane, the increased contact area of the connecting portion 31 effectively disperses the pressure transmitted from the cylinder 100 to the hot pressing movable table 200. This means that while the thrust provided by the cylinder 100 remains constant, the pressure per unit area (i.e., intensity) is correspondingly reduced. This design optimizes load distribution and significantly enhances the deformation resistance of the hot pressing movable table 200 under pressure. This enhanced deformation resistance allows the hot pressing movable table 200 to maintain better flatness during the pressing process, thereby ensuring a higher level of flatness for the PCB (printed circuit board) being hot-pressed on it. Even if the connecting base 3 deforms and bulges in its center when subjected to the thrust of the piston 2, the open groove 5 ensures that the bulge of the piston 2 does not directly contact the hot pressing movable table 200. This design effectively prevents additional pressure on the hot pressing movable table 200 caused by piston 2 deformation, further ensuring the flatness of the PCB during processing. Improving the deformation resistance of the hot pressing movable table 200 by optimizing the structure of the connecting base 3 rather than simply increasing the material thickness maintains high performance while reducing manufacturing costs. Connecting base 3 is truncated cone-shaped, with a truncated outer surface. This gradually increases the outer surface area from the first end to the second end of connecting base 3. This gradual increase in area helps to more evenly distribute the force transmitted by piston 2 and reduce localized stress concentration. The projected area of connecting portion 31 is larger than the projected area of the first end of connecting base 3, which in turn is greater than or equal to the projected area of piston 2. This design helps to gradually disperse pressure during force transmission, reducing localized impact and deformation on the hot pressing movable table 200. This helps to reduce deformation of the movable table under high-pressure working conditions, thereby improving the precision and quality of PCB processing.
[0034] In one embodiment, a raised portion 32 is formed in the middle of the bottom of the open slot 5 and is located within the open slot 5. In this embodiment, the raised portion 32 is arc-shaped and increases the weight of the connecting base 3, making the entire structure more vertically stable. This increased weight helps to resist any tilting or rotational torque generated by the thrust of the oil cylinder 100, thereby improving the stability of the entire structure. The design of the raised portion 32 helps to more evenly distribute force within the connecting base 3, reducing stress concentration points, and thus extending the service life of the connecting base 3.
[0035] In one embodiment, the piston 2 includes a plunger 21 and a plunger head 22. The plunger 21 is disposed in the cavity 4. Along the first direction, the projected area of the connecting portion 31 on the preset plane is larger than the projected area of the plunger head 22 on the preset plane. The projected area of the plunger head 22 on the preset plane is larger than or equal to the projected area of the plunger 21 on the preset plane.
[0036] The plunger head 22 has a third end and a fourth end that are opposite to each other along a first direction. The third end of the plunger head 22 is connected to the plunger 21, and the fourth end of the plunger head 22 is connected to the first end of the connecting seat 3, and the two can move relative to each other. In this embodiment, the plunger head 22 and the plunger 21 are designed to be separate bodies, so that the plunger head 22 can move relative to the plunger 21. The plunger head 22 and the connecting seat 3 can move in a three-dimensional ball-jointed manner or in a plane. The relative movement ability of the plunger head 22 and the connecting seat 3 enables the oil cylinder 100 to better adapt to dynamic load changes and improve the response speed and flexibility of the oil cylinder 100 to different working conditions. The relative movement ability of the plunger head 22 and the piston 2 head allows fine-tuning between the plunger head 22 and the connecting seat 3 when the load changes, thereby reducing stress concentration points and extending the service life of the oil cylinder 100.
[0037] In one embodiment, the end surface of the first end of the connecting seat 3 is a concave surface 33, and the end surface of the fourth end of the plunger head 22 is a convex surface 221. The convex surface 221 is in contact with the concave surface 33, and the concave surface 33 and the convex surface 221 can move relative to each other. In this embodiment, the piston 2 and the cylinder body 1 are sealed by a seal. The hot pressing movable platform 200 is installed in the guide rail on the mounting frame 500. The piston 2 pushes the hot pressing movable platform 200 to move in the guide rail. Due to manufacturing and installation deviations of the guide rail and the seal, the seal of the oil cylinder 100 may suffer abnormal wear. The concave and convex surface 221 structure between the plunger head 22 and the connecting seat 3 allows for micro-adaptive adjustment. The relative displacement between the plunger head 22 and the connecting seat 3 can reduce the wear on the seal caused by this deviation. At the same time, the concave and convex surface 221 between the plunger head 22 and the connecting seat 3 is mirror-finished and polished and coated with graphite lubricant, which reduces the friction coefficient between the two and further reduces wear. In addition, if the plunger 21 is twisted during the rising process, the concave-convex spherical surface releases the twisting load, preventing the twisting of the hot pressing movable table 200 from causing wear and scratches on the guide rail fixed to the mounting frame 500.
[0038] In one embodiment, the oil cylinder 100 further includes a first fixing seat 6 connected to a first end of the connecting seat 3. The first fixing seat 6 has a first through-hole extending along a first direction through the first fixing seat 6. The plunger head 22 is positioned within the first through-hole, and a first gap is formed between the outer circumference of the plunger head 22 and the wall of the first through-hole. In this embodiment, the clearance between the plunger head 22 and the first fixing seat 6 provides the necessary conditions for relative movement between the plunger head 22 and the connecting seat 3, allowing the plunger head 22 to move freely within a certain range to adapt to different operating conditions and load changes.
[0039] According to the oil cylinder 100 of the embodiment of the present invention, the oil cylinder 100 is in a non-working state, the piston 2 is located in the cavity 4 of the cylinder body 1, the first end of the connecting seat 3 is connected to the piston 2, and the second end is connected to the hot pressing movable platform 200 through the connecting portion 31. When the oil cylinder 100 starts to work, the piston 2 moves along the first direction (the axial direction of the cylinder body 1), and the movement of the piston 2 drives the connecting seat 3 and the hot pressing movable platform 200 connected thereto to move together. In the subsequent hot pressing process, the hot pressing movable platform 200, driven by the oil cylinder 100, can cooperate with other structures to perform hot pressing treatment on the workpiece. On a predetermined plane, the projected area of the connecting portion 31 is larger than the projected area of the piston 2. This results in a larger contact area between the connecting portion 31 and the hot pressing platform 200 than between the piston 2 and the hot pressing platform 200. When pressure is transmitted to the connecting portion 31, due to the increased contact area, the pressure per unit area (i.e., the pressure intensity) decreases accordingly when the thrust provided by the cylinder 100 is constant. This optimizes load distribution and enhances the hot pressing platform 200's resistance to deformation under pressure, thereby improving the flatness of the PCB. Furthermore, when the connecting base 3 deforms and bulges in the middle due to the thrust of the piston 2, the provision of the open groove 5 prevents the bulge of the piston 2 from contacting the hot pressing platform 200, thereby preventing deformation caused by the deformation of the piston 2 and further ensuring the flatness of the PCB. By optimizing the structure of the connecting base 3, the deformation resistance of the hot pressing platform 200 is improved, and the increase in material thickness is avoided, thereby reducing manufacturing costs.
[0040] In addition, if Figures 1 to 4As shown, an embodiment of the present invention provides a hot pressing device, including a mounting frame 500, a hot pressing movable table 200, a first hot pressing plate 300, a second hot pressing plate 400 and the oil cylinder 100 of the above embodiment, the cylinder body 1, the hot pressing movable table 200 and the second hot pressing plate 400 are connected to the mounting frame 500, the connecting seat 3 is connected to the hot pressing movable table 200, the first hot pressing plate 300 is connected to the side of the hot pressing movable table 200 away from the connecting seat 3, the first hot pressing plate 300 and the second hot pressing plate 400 are arranged at intervals along the first direction, the first hot pressing plate 300 is suitable for carrying a PCB, and the piston 2 drives the hot pressing movable table 200 to move along the first direction, so that the PCB on the first hot pressing plate 300 can be clamped between the first hot pressing plate 300 and the second hot pressing plate 400. In this embodiment, the hot pressing movable platform 200 is square, with the pre-set plane coinciding with the lower side of the hot pressing movable platform 200. The side or bottom of the oil cylinder 100 is provided with oil holes for the passage of hydraulic oil, and the piston 2 is raised and lowered by the hydraulic oil. By using the oil cylinder 100 to drive the movement of the hot pressing movable platform 200, a fast and precise PCB clamping and hot pressing process can be achieved, thereby improving production efficiency. By optimizing the design of the connecting seat 3 and the oil cylinder 100, the deformation resistance of the hot pressing movable platform 200 can be improved without increasing the material thickness, avoiding the increase in manufacturing costs caused by increasing the thickness of the hot pressing plate and the hot pressing movable platform 200.
[0041] In one embodiment, the hot pressing apparatus further includes a second fixing base 700 connected to the hot pressing movable table 200. The second fixing base 700 has a second through hole extending along a first direction through the second fixing base 700. The connecting base 3 is positioned within the second through hole, with a second gap formed between the outer surface of the connecting base 3 and the wall of the second through hole. In this embodiment, the presence of the second gap provides the connecting base 3 with a certain amount of adjustment space when subjected to uneven forces, allowing the connecting base 3 to move freely within a certain range to adapt to varying working conditions and load variations.
[0042] In one embodiment, the hot pressing apparatus further includes a third hot pressing platen 600, which is positioned between the first hot pressing platen 300 and the second hot pressing platen 400. The third hot pressing platen 600 is adapted to support a PCB and is slidably connected to the mounting bracket 500. The piston 2 drives the third hot pressing platen 600 via the hot pressing movable platform 200, thereby enabling the PCB on the first hot pressing platen 300 to be clamped between the first and third hot pressing plates 600, and also enabling the PCB on the third hot pressing platen 600 to be clamped between the second and third hot pressing plates 400, 600. In this embodiment, by adding the third hot pressing platen 600, the hot pressing apparatus can simultaneously flatten the PCBs on both the first and third hot pressing plates 300, 600. This means that at least two PCBs can be processed simultaneously during a single hot pressing process, significantly improving hot pressing efficiency.
[0043] In one embodiment, there are multiple third hot press plates 600, spaced apart from each other along a first direction. The piston 2, via the hot press movable platform 200, drives all third hot press plates 600 in the first direction, such that the PCB on the first hot press plate 300 is clamped between the first hot press plate 300 and the first third hot press plate 600, the PCB on the last third hot press plate 600 is clamped between the second hot press plate 400 and the last third hot press plate 600, and the PCBs on the remaining third hot press plates 600 are clamped between two adjacent third hot press plates 600. In this embodiment, by adding multiple third hot press plates 600, the hot press apparatus can process multiple PCBs simultaneously. This means that multiple PCBs can be flattened and pressed simultaneously during a single hot press process, significantly improving hot press efficiency. Each third hot press plate 600 applies uniform pressure to adjacent PCBs, helping to ensure that all PCBs receive consistent treatment during the hot press process.
[0044] According to the hot pressing device provided by the present invention, in the initial state, a certain distance is maintained between the first hot pressing platen 300 and the second hot pressing platen 400. Once the PCB (printed circuit board) to be hot pressed is placed on the first hot pressing platen 300, the pressing device begins operation. The piston 2 of the hydraulic cylinder 100 moves in a first direction. As the piston 2 moves, the first hot pressing platen 300 (and the PCB on it) are pushed toward the second hot pressing platen 400. When the two contact, the hot pressing process begins. The second hot pressing platen 400 may have been preheated to an appropriate temperature to ensure the necessary heat transfer during the hot pressing process. The PCB is evenly pressured and heated between the first and second hot pressing plates 300 and 400, achieving the desired flatness. The piston 2 of the hydraulic cylinder 100 then begins to move in the opposite direction, returning the first hot pressing platen 300 (and the PCB on it) to its initial position. At this point, the operator or automated equipment can remove the hot-pressed PCB and prepare for the next hot pressing cycle. By optimizing the design of the oil cylinder 100 and the connecting seat 3, the thickness of the hot pressing movable table 200 and the hot plate is avoided, thereby reducing manufacturing costs. The above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.
Claims
1. A cylinder, characterized in that: It comprises a cylinder, a piston and a connecting seat, wherein the cylinder is provided with a cavity, and the piston is provided in the cavity and can reciprocate along a first direction; The connecting seat has a first end and a second end opposite to each other along the first direction, and the first end of the connecting seat is connected to the piston; The second end of the connecting seat is connected to the hot pressing movable table. The connecting seat is provided with an adjustment device, which is used to adjust the distribution mode of the load output by the piston when it is transferred to the hot pressing movable table, so as to reduce the contact strength borne by the hot pressing movable table during the force application process.
2. The oil cylinder according to claim 1, characterized in that: The second end of the connecting seat is connected to one end of the adjusting device, and the other end of the adjusting device is connected to the hot pressing movable table. Along the first direction, the projection area of the adjusting device on a preset plane perpendicular to the first direction is larger than the projection area of the piston on the preset plane.
3. The oil cylinder according to claim 2, characterized in that: The adjusting device has an open groove and a connecting portion arranged around the open groove, the second end of the connecting seat is connected to one end of the connecting portion, and the other end of the connecting portion is connected to the hot pressing movable table. Along the first direction, the projected area of the connecting portion on the preset plane is larger than the projected area of the first end of the connecting seat on the preset plane; the projected area of the first end of the connecting seat on the preset plane is larger than or equal to the projected area of the piston on the preset plane.
4. The oil cylinder according to claim 3, characterized in that: A convex portion is provided in the middle of the bottom of the open groove, and the convex portion is located inside the open groove.
5. The oil cylinder according to claim 3, characterized in that: The piston includes a plunger and a plunger head, the plunger is disposed in the cavity, and along the first direction, the projected area of the connecting portion on the preset plane is larger than the projected area of the plunger head on the preset plane, and the projected area of the plunger head on the preset plane is larger than or equal to the projected area of the plunger on the preset plane; The plunger head has a third end and a fourth end opposite to each other along the first direction. The third end of the plunger head is connected to the plunger, and the fourth end of the plunger head is connected to the first end of the connecting seat, and the two can move relative to each other.
6. The oil cylinder according to claim 5, characterized in that: The end surface of the first end of the connecting seat is a concave surface, and the end surface of the fourth end of the plunger head is a convex surface. The convex surface is attached to the concave surface and the concave surface and the convex surface can move relative to each other.
7. The oil cylinder according to claim 5, characterized in that: The oil cylinder also includes a first fixed seat, which is connected to the first end of the connecting seat. The first fixed seat has a first through hole, which passes through the first fixed seat along the first direction. The plunger head is located in the first through hole, and a first gap is formed between the outer peripheral surface of the plunger head and the hole wall of the first through hole.
8. A hot pressing device, characterized in that: It includes a mounting frame, a hot pressing movable table, a first hot pressing plate, a second hot pressing plate and the oil cylinder according to any one of claims 1 to 7, the cylinder body, the hot pressing movable table and the second hot pressing plate are connected to the mounting frame, the connecting seat is connected to the hot pressing movable table, the first hot pressing plate is connected to the side of the hot pressing movable table away from the connecting seat, the first hot pressing plate and the second hot pressing plate are arranged at intervals along the first direction, the first hot pressing plate is suitable for carrying a PCB, and the piston drives the hot pressing movable table to move along the first direction so that the PCB on the first hot pressing plate can be clamped between the first hot pressing plate and the second hot pressing plate.
9. The hot pressing device according to claim 8, characterized in that The hot pressing device also includes a second fixed seat, which is connected to the hot pressing movable table. The second fixed seat has a second through hole, which passes through the second fixed seat along the first direction. The connecting seat is located in the second through hole, and a second gap is formed between the outer peripheral surface of the connecting seat and the hole wall of the second through hole.
10. The hot pressing device according to claim 8, characterized in that The hot pressing device also includes a third hot pressing plate, which is located between the first hot pressing plate and the second hot pressing plate. The third hot pressing plate is suitable for carrying the PCB. The third hot pressing plate is slidably connected to the mounting frame. The piston drives the third hot pressing plate to move through the hot pressing movable platform, so that the PCB on the first hot pressing plate can be clamped between the first hot pressing plate and the third hot pressing plate, and the PCB on the third hot pressing plate can be clamped between the second hot pressing plate and the third hot pressing plate.
11. The hot pressing device according to claim 10, characterized in that There are multiple third hot pressing plates, and the multiple third hot pressing plates are arranged at intervals along the first direction. The piston drives all the third hot pressing plates to move along the first direction through the hot pressing movable table, so that the PCB on the first hot pressing plate can be clamped between the first hot pressing plate and the first of the third hot pressing plates, and the PCB on the last of the third hot pressing plates can be clamped between the second hot pressing plate and the last of the third hot pressing plates, and the PCBs on the remaining third hot pressing plates can be clamped between two adjacent third hot pressing plates.