A press lower nut mounting device and a press lower nut mounting method

Abstract

The application provides a press lower nut mounting device and a press lower nut mounting method, and relates to the field of nut mounting.The device comprises a moving base plate, an energy storage screw rod, a screw nut, a coil spring, and a transmission assembly.The energy storage screw rod is rotatably arranged on the moving base plate and is a ball screw.The screw nut is arranged on the energy storage screw rod and is slidably connected with the support frame.The screw nut can be raised and lowered on the support frame.The coil spring is sleeved on the energy storage screw rod, and the two ends of the coil spring are connected with the energy storage screw rod and the support frame respectively.The energy storage screw rod can store energy when it rotates, and the energy storage screw rod can be reversely rotated when the coil spring releases energy.The transmission assembly is arranged on the support frame, and the two power ends of the transmission assembly are connected with the bearing disc and the energy storage screw rod respectively.The application can provide power and support for screwing nuts, reduce the labor intensity of operators, and improve the installation efficiency and installation quality.

Description

Technical Field

[0001] This invention relates to the field of nut installation, and more particularly to a nut installation device and method for a press. Background Technology

[0002] As a core piece of equipment in the equipment manufacturing industry, the assembly of a press requires the installation of tension nuts and bolts inside the foundation pit during its final assembly process to ensure reliable fastening between the machine body and the base. This process involves a confined working space and dense equipment layout, placing high demands on the installation efficiency of the tension nuts, the precision of the thread fit, and the safety of the assembly.

[0003] In the prior art, Chinese utility model patent CN 222627647 U provides a large nut inversion device, including a device screw, a nut tray, a spring, a spring tray, and a hexagonal nut. The device screw mates with the large nut to be installed. The nut tray is located above the device screw and supports the large nut. The spring is located between the nut tray and the spring tray. Through the elasticity of the spring, the nut tray automatically aligns and centers the threads when it contacts the threaded section of the nut screw, facilitating the quick and efficient screwing of the large nut into the nut screw. This technical solution solves the problems of repeated alignment and difficulty in inserting the first thread when inverting large nuts, which are time-consuming, labor-intensive, inefficient, and pose high safety risks.

[0004] However, when the above technical solution is used to assemble the lower nut on the press base in the foundation pit, the following problems exist because the lower nut is only supported by a spring and still relies on manual tightening: On the one hand, the nut itself is quite heavy (usually tens to hundreds of kilograms). As the spring deforms and recovers during the tightening process, the elastic force generated by the spring is difficult to completely balance the weight of the nut. At this time, there is still a large positive pressure between the nut and the thread of the pull rod. The friction between the thread pairs increases significantly during tightening, and the thread seizing phenomenon is very likely to occur. This can lead to difficulty in tightening or damage to the threads or even scrap the workpiece. On the other hand, with heavy nuts and thread friction resistance, operators need to overcome a large rotational torque. Especially in confined spaces such as foundation pits, the operating stroke of large wrenches is limited, making the operation difficult, time-consuming, and posing a safety hazard of slippage and injury. Summary of the Invention

[0005] To address the technical problems of low efficiency, easy seizing, and high labor intensity in the installation of the lower nut on the base of the press, the present invention provides a lower nut installation device and method for the press, which can provide power and support for tightening the nut, reduce the labor intensity of the operator, and improve installation efficiency and quality.

[0006] In a first aspect, the present invention provides a press lower nut mounting device to solve the above-mentioned technical problems, comprising a movable base plate, on which a support frame is further provided, and further comprising: an energy storage screw, the energy storage screw being rotatably mounted on the movable base plate, the energy storage screw being a ball screw; a screw nut, the screw nut being mounted on the energy storage screw and slidably connected to the support frame, the screw nut being able to move up and down on the support frame; and a coil spring, the coil spring being sleeved on the energy storage screw, the two ends of the coil spring being respectively connected to the energy storage screw and the support frame. The system comprises: a connection whereby the energy-storing screw, when rotated, enables the coil spring to store energy, and when the coil spring releases energy, it drives the energy-storing screw to rotate in the opposite direction; a support plate rotatably mounted on the screw nut, used to drive the nut to be installed to rotate and move up and down; and a transmission assembly mounted on the support frame, with its two power ends connected to the support plate and the energy-storing screw respectively. The support plate can drive the energy-storing screw to rotate via the transmission assembly, and the energy-storing screw can also drive the support plate to rotate in the opposite direction via the transmission assembly.

[0007] This invention, through the synergistic action of an energy-storing screw, a coil spring, and a transmission assembly, can store sufficient elastic potential energy before tightening and continuously release torque during tightening, providing a stable and adjustable upward support force for the nut to be installed. This support force is sufficient to balance the nut's own weight, thereby significantly reducing the normal pressure and friction between the nut and the threaded pair of the tightening bolt from the root. This effectively overcomes the technical problems in the prior art where the nut's own weight causes high tightening resistance, easy thread damage, or even seizing. At the same time, this purely mechanical transmission structure operates stably and reliably, requiring no additional power source. It is particularly suitable for complex working environments with limited spaces such as foundation pits, significantly reducing the labor intensity of operators and fundamentally improving installation efficiency and the safety of threaded mating.

[0008] Furthermore, the transmission assembly includes an upper gear, which is sleeved on the outer ring of the bearing plate and meshes with a first gear. A transmission sleeve is coaxially arranged below the first gear, which can rest on the upper gear. The transmission sleeve is rotatably and vertically mounted on the support frame. An intermediate shaft is splined inside the transmission sleeve and is vertically and rotatably mounted on the movable base plate. A second gear is mounted on the intermediate shaft and meshes with a lower gear. The lower gear is sleeved on the energy storage screw and can drive the energy storage screw to rotate.

[0009] The transmission component of this invention ensures a smooth and controllable energy storage and release process. At the same time, the spline connection between the transmission sleeve and the intermediate shaft allows for relative axial displacement, so that while the bearing plate rises with the lead screw nut, the transmission path can still maintain meshing and transmit torque. This design ensures the continuity of action and transmission reliability of the entire device during dynamic lifting and lowering.

[0010] Furthermore, the transmission ratio between the upper gear and the lower gear is the same as the transmission ratio between gear one and gear two, and the lead of the energy storage screw is the same as the lead of the nut to be installed.

[0011] This invention controls the transmission ratio and the lead of the energy storage screw to ensure that the vertical displacement corresponding to each rotation of the bearing plate is completely synchronized with the thread pitch of the nut to be installed. As a result, during the tightening process, the height to which the screw nut rises is always consistent with the height to which the nut to be installed is screwed in along the tension bolt. This completely eliminates the additional force between the threads or the phenomenon of separation caused by the difference in lead, ensuring that the support force provided by the device always acts on the axial direction of the nut, minimizing the frictional resistance between the threads, and ensuring the smoothness of the tightening process and the integrity of the threads.

[0012] Furthermore, the upper gear and the bearing plate are an integrated structure. The upper end face of the gear is provided with at least four slots. Each slot has a slot and a lever is inserted through the slot. The end of the lever can extend into the nut to be installed.

[0013] This invention, by setting multiple card holders and levers, ensures good coaxiality between the nut to be installed and the carrier plate through multi-point positioning, preventing skewing at the beginning of nut installation and ensuring smooth screwing in of the first thread. On the other hand, the levers provide a longer operating lever arm, allowing the operator to control the rotation speed of the carrier plate more smoothly with less force, avoiding impact at the beginning of tightening, and enabling smooth engagement of the nut and the thread of the lever, further reducing the risk of damage to the threads.

[0014] Furthermore, it also includes a locking element that connects the lower gear to the movable base plate.

[0015] This invention uses a locking component to lock with the lower gear after energy storage is complete, thereby reliably locking the entire transmission chain and preventing the coil spring from accidentally releasing energy in a non-operating state. This ensures safety before operation and stability of the device. It also provides a controllable "emergency stop" mechanism for mid-installation pauses, position adjustments, or handling of abnormal situations, making operation more flexible and safer.

[0016] Furthermore, multiple guide plates are provided on the outer circumference of the lead screw nut. The ends of the guide plates extend into the support frame and can move up and down along the sliding grooves on the support frame. A connecting plate is horizontally provided between two adjacent guide plates. A mounting seat is rotatably provided at the lower part of the bearing plate. The mounting seat is coaxially arranged with the lead screw nut. A mounting groove is provided on the lower surface of the mounting seat. The upper ends of the guide plates extend into the corresponding mounting grooves. There is a gap between the guide plates and the mounting grooves. An adjusting screw is vertically provided on the connecting plate. The end of the adjusting screw can abut against the lower surface of the mounting seat. The adjusting screw can push the mounting seat to move upward.

[0017] This invention provides an independent fine-tuning capability for the height of the bearing plate by adjusting the screw. This design can compensate for the slight deviation between the rising height of the screw nut and the actual required screwing height caused by the cumulative errors in the manufacturing and assembly of components such as the energy storage screw and gear. The height of the bearing plate relative to the screw nut can be adjusted in real time by adjusting the screw, thereby dynamically eliminating the additional tightening force caused by the error between the nut thread and the tie rod thread, effectively avoiding abnormal thread wear or jamming caused by the accumulation of errors.

[0018] Furthermore, a pressure sensor is provided between the mounting groove and the guide plate, and the pressure sensor is connected to a display.

[0019] This invention enables operators to intuitively understand the force between the nut to be installed and the tie rod through a pressure sensor and a display, thereby improving the accuracy and timeliness of adjusting the bearing plate.

[0020] Furthermore, the lower part of the movable base plate is provided with rollers, and three leveling screws are vertically arranged on the movable base plate.

[0021] This invention uses three leveling screws to fix the movable base plate and level the nut to be installed, so that the nut to be installed is aligned with the pull rod, ensuring smooth screwing in of the first thread and improving installation accuracy.

[0022] Secondly, the present invention also provides a method for installing a lower nut on a press, using the above-mentioned lower nut installation device on a press, comprising the following steps:

[0023] S01: Insert the lever into the nut to be installed, and then suspend the nut on the support plate;

[0024] S02: Unlock the locking member, rotate the upper gear, drive the energy storage screw to rotate through the transmission assembly, the coil spring generates elastic deformation to store energy, until the bearing plate rotates a set number of times, and lock the transmission assembly through the locking member;

[0025] S03: Move the movable base plate, rotate the leveling screw so that the roller leaves the ground, and adjust the leveling screw so that the nut to be installed is aligned with the corresponding tie rod;

[0026] S04: Release the locking component, the coil spring releases energy, the energy storage screw drives the bearing plate to rotate through the transmission assembly, and the screw nut drives the bearing plate to rise synchronously. The manual control of the rotation speed of the bearing plate through the lever ensures that the bearing plate rotates at a uniform speed until the coil spring no longer drives the energy storage screw to rotate.

[0027] S05: Measure the distance between the lower end face of the nut to be installed and the lower end face of the pull rod. If the distance does not meet the requirements, manually rotate the bearing plate in the opposite or same direction using the lever until the distance between the lower end face of the nut to be installed and the lower end face of the pull rod meets the installation requirements.

[0028] This invention first uses a transmission component to store energy for a coil spring, and then uses the coil spring to release energy to drive the nut to be installed to be screwed in, which significantly reduces the manual tightening torque. The method uses three leveling screws to achieve precise centering, and combines the fine-tuning function of the adjusting screws to compensate for errors in real time, ensuring that the threaded pair meshes in an ideal state. It solves the problems of low efficiency, high labor intensity and easy damage to threads in traditional methods, improves the safety and repeatability of the operation, and achieves high-quality and high-efficiency nut installation.

[0029] Furthermore, in S04, when the display reading exceeds a set threshold range, the transmission assembly is locked by the locking member, and the adjusting screw is adjusted to move the mounting base downward until the reading decreases to the set threshold range.

[0030] This invention adjusts the height of the bearing plate by adjusting the pressure reading, thereby preventing the threads of the nut to be installed from pressing against the threads of the tie rod and reducing the friction of the threaded pair.

[0031] As can be seen from the above technical solutions, the present invention has the following advantages:

[0032] This invention provides a device and method for installing a lower nut on a press. Through the synergistic action of an energy-storing screw, a coil spring, and a transmission assembly, sufficient elastic potential energy is stored before tightening and continuously released during tightening, providing a stable and adjustable upward support force for the nut to be installed. This support force is sufficient to balance the nut's own weight, thereby significantly reducing the normal pressure and friction between the nut and the threaded pair of the tightening bolt. This effectively overcomes the technical problems of high tightening resistance, easy thread damage, and even seizing caused by the nut's own weight in existing technologies. Furthermore, this purely mechanical transmission structure operates stably and reliably, requiring no additional power source, making it particularly suitable for complex working environments with limited spaces such as foundation pits. It significantly reduces the labor intensity of operators and addresses the root cause of the problem. This design significantly improves installation efficiency and the safety of threaded connections. The transmission components ensure smooth and controllable energy storage and release processes. Simultaneously, the spline connection between the transmission sleeve and the intermediate shaft allows for axial relative displacement, ensuring that the transmission path maintains meshing and torque transmission even as the bearing disc rises with the screw nut. This design guarantees the continuity of action and transmission reliability of the entire device during dynamic lifting and lowering. By controlling the transmission ratio and the lead of the energy storage screw, the vertical displacement corresponding to each rotation of the bearing disc is perfectly synchronized with the thread pitch of the nut to be installed. Therefore, during tightening, the height to which the screw nut rises is always consistent with the height to which the nut to be installed is screwed into the tension bolt, completely eliminating any additional force or tension caused by lead differences between the threads. The separation of the two ensures that the supporting force provided by the device always acts on the axial direction of the nut, minimizing the frictional resistance between the threads and guaranteeing the smoothness of the tightening process and the integrity of the threads. By setting multiple retainers and levers, on the one hand, multi-point positioning ensures good coaxiality between the nut to be installed and the carrier plate, preventing skewing at the beginning of nut installation and ensuring smooth screwing of the first thread. On the other hand, the levers provide a longer operating arm, allowing the operator to control the rotation speed of the carrier plate more smoothly with less force, avoiding initial impact during tightening, and ensuring smooth engagement of the nut and pull rod threads, further reducing the risk of thread damage. The locking element locks with the lower gear after energy storage is complete, thus reliably locking the entire transmission chain. Preventing accidental energy release of the coil spring in non-operational states ensures safety and stability before operation. It also provides a controllable "emergency stop" mechanism for mid-installation pauses, position adjustments, or handling of abnormal situations, making operation more flexible and safer. The adjustable screw provides independent fine-tuning capability for the height of the bearing plate. This design can compensate for the slight deviation between the rising height of the screw nut and the actual required screwing height caused by the cumulative manufacturing and assembly errors of components such as the energy storage screw and gears. The height of the bearing plate relative to the screw nut can be adjusted in real time by adjusting the screw, thereby dynamically eliminating the additional tightening force caused by errors between the nut thread and the tie rod thread, effectively avoiding abnormal thread wear or jamming caused by the accumulation of errors.Pressure sensors and displays allow operators to visually understand the force between the nut to be installed and the tie rod, improving the accuracy and timeliness of adjusting the bearing plate. Three leveling screws secure the movable base plate and level the nut to be installed, ensuring alignment between the nut and the tie rod, guaranteeing smooth screw insertion and improving installation precision. Attached Figure Description

[0033] To more clearly illustrate the technical solution of the present invention, the accompanying drawings used in the description will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a structural schematic diagram of a specific embodiment of the present invention. Figure 1 .

[0035] Figure 2 This is a structural schematic diagram of a specific embodiment of the present invention. Figure 2 .

[0036] Figure 3 This is a schematic diagram of the assembly structure of the locking component and the movable base plate in a specific embodiment of the present invention.

[0037] Figure 4 This is a schematic diagram of the assembly structure of the housing, coil spring, energy storage screw and lower gear in a specific embodiment of the present invention.

[0038] Figure 5 This is a schematic diagram of the assembly structure of the bearing plate, upper gear, mounting base and guide plate in a specific embodiment of the present invention.

[0039] In the diagram, 1. Movable base plate; 101. Support column; 102. Support frame; 103. Mounting ring; 104. Slide groove; 106. Roller; 2. Bearing 1; 3. Energy storage screw; 301. Lower gear; 4. Coil spring; 5. Housing; 501. Limiting plate; 6. Screw nut; 601. Guide plate; 602. Connecting plate; 7. Bearing plate; 701. Upper gear; 702. Card seat; 703. Mounting groove; 704. Mounting seat; 8. Lever; 9. Locking element; 10. Bearing 2; 11. Intermediate shaft; 12. Gear 1; 13. Adjusting screw; 14. Leveling screw; 15. Nut to be installed; 16. Pull rod; 17. Gear 2; 18. Transmission sleeve; 19. Damping hinge. Detailed Implementation

[0040] To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this invention, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0041] Example 1

[0042] like Figure 1 , Figure 2 and Figure 4 As shown, this specific embodiment provides a lower nut mounting device for a press, including a movable base plate 1, a support frame, an energy storage screw 3, and a coil spring 4. The movable base plate 1 is also equipped with a support frame. The energy storage screw 3 is rotatably mounted on the movable base plate 1 via a bearing 2. The energy storage screw 3 is a ball screw. A screw nut 6 is mounted on the energy storage screw 3 and is slidably connected to the support frame, allowing the screw nut 6 to rise and fall on the support frame. The coil spring 4 is sleeved on the energy storage screw 3, with both ends of the coil spring 4 connected to the energy storage screw. 3 is connected to the support frame. When the energy storage screw 3 rotates, it can cause the coil spring 4 to store energy. When the coil spring 4 releases energy, it can drive the energy storage screw 3 to rotate in the opposite direction. The bearing plate 7 is rotatably mounted on the screw nut 6. The bearing plate 7 is used to drive the nut 15 to be installed to rotate and lift. The transmission component is mounted on the support frame. The two power ends of the transmission component are connected to the bearing plate 7 and the energy storage screw 3 respectively. The bearing plate 7 can drive the energy storage screw 3 to rotate through the transmission component. The energy storage screw 3 can also drive the bearing plate 7 to rotate in the opposite direction through the transmission component. Specifically, the movable base plate 1 serves as the overall installation base, and the support frame includes a shell 5, multiple vertical support columns 101, and an annular support frame 102. A limiting plate 501 is provided on the outer circumference of the shell 5. The limiting plate 501 is inserted into the sliding groove 104 of the support column 101. Under the action of the weight of the shell 5 itself, the limiting plate 501 abuts against the bottom of the sliding groove 104, and a gap is provided between the shell 5 and the movable base plate 1. The support column 101 is welded to the support frame 102. The coil spring 4 is a spiral spring, with its inner end fixedly connected to the energy storage screw 3 and its outer end fixedly connected to the inner wall of the shell 5. When the energy storage screw 3 rotates in the forward direction, the coil spring 4 tightens to store elastic potential energy. When the energy storage screw 3 rotates in the reverse direction, the coil spring 4 releases potential energy to drive the screw to rotate. During operation, the bearing plate 7 first drives the energy storage screw 3 to rotate via the transmission assembly, so that the coil spring 4 completes energy storage. After locking, the device is aligned with the pull rod 16 and the lock is released. The coil spring 4 releases energy and drives the energy storage screw 3 to reverse, which then drives the bearing plate 7 to rotate via the transmission assembly. At the same time, the screw nut 6 drives the bearing plate 7 to rise synchronously, so that the bearing plate 7 continuously provides upward support for the nut.

[0043] In this embodiment, the ball screw does not have a self-locking capability. When the nut 15 to be installed is placed on the bearing plate 7, it exerts a downward force on the screw nut 6, thereby driving the energy storage screw 3 to rotate and causing the coil spring 4 to exert an elastic force until the torque effect of the coil spring 4 on the energy storage screw 3 is the same as the torque effect of the screw nut 6 on it. At this point, the screw nut 6 stops descending, and the nut 15 to be installed is in a state of force balance. At this time, the elastic force generated by the coil spring 4 can fully support the weight of the nut 15 to be installed. Then, the energy storage screw 3 is driven to rotate through the transmission component, so that the coil spring 4 continues to store energy. The elastic force of the coil spring 4 is greater than the weight of the nut. When the nut is tightened, the coil spring 4 continuously releases torque, driving the energy storage screw 3 to rotate and driving the screw... Nut 6 rises synchronously, and the bearing plate 7 provides stable upward support for the nut. This support force offsets the nut's entire weight throughout the tightening process, significantly reducing the positive pressure between the nut and the thread of the pull rod 16 (to less than its own weight). This significantly reduces the frictional resistance between the threaded pairs, preventing the threads from seizing or locking due to heavy loads. In contrast, the springs in existing technologies can only provide support equal to the nut's weight initially. As the elastic deformation recovers, the support force decreases and cannot support the nut's weight, leaving a positive pressure between the nut and the pull rod 16. Meanwhile, the coil spring 4 provides the main tightening torque, allowing manual installation by simply controlling the rotation speed of the bearing plate 7. This significantly reduces manual operating torque, labor intensity, and simultaneously improves installation efficiency and assembly safety.

[0044] like Figure 1 and Figure 2As shown, in this embodiment, the transmission assembly can adopt the following specific structure: the transmission assembly includes an upper gear 701, which is sleeved on the outer ring of the bearing disk 7. The upper gear 701 meshes with a gear 12. A transmission sleeve 18 is coaxially arranged at the lower part of the gear 12. The gear 12 can rest on the upper gear 701. The upper gear 701 can drive the upper gear 701 to move upward. The transmission sleeve 18 is rotatably and vertically arranged on the support frame. An intermediate shaft 11 is splined inside the transmission sleeve 18. The intermediate shaft 11 is vertically and rotatably arranged on the movable base plate 1. A gear 2 17 is arranged on the intermediate shaft 11. The gear 2 17 meshes with a lower gear 301. The lower gear 301 is sleeved on the energy storage screw 3. The lower gear 301 can drive the energy storage screw 3 to rotate. The upper gear 701 is fixed to the outer ring of the bearing disk 7 and rotates synchronously with the bearing disk 7 on the same axis. Gear 12 is constantly meshed with the upper gear 701 and its lower part is fixedly connected to the transmission sleeve 18 as a whole. The transmission sleeve 18 is rotatable and can be vertically floatingly mounted on the mounting ring 103 on the outer circumference of the annular support frame 102. The outer diameter of the transmission sleeve 18 is smaller than the inner diameter of the mounting ring 103. The intermediate shaft 11 is a splined shaft, which forms a spline fit with the inner spline of the transmission sleeve 18. It can transmit torque and allow axial relative sliding. The intermediate shaft 11 is vertically rotatably mounted on the movable base plate 1 through the bearing 2 10. The lower end is fixed with gear 2 17. The intermediate shaft 11 and gear 2 17 are an integrated structure. Gear 2 17 is meshed with the lower gear 301. The lower gear 301 is fixedly connected to the lower end of the energy storage screw 3. The lower gear 301 and the energy storage screw 3 are an integrated structure and can drive the energy storage screw 3 to rotate synchronously. During operation, the rotation of the bearing disk 7 sequentially drives the upper gear 701, gear one 12, transmission sleeve 18, intermediate shaft 11, gear two 17, and lower gear 301 to rotate, thereby driving the energy storage screw 3 to move. When the coil spring 4 releases energy, the transmission path reverses, driving the bearing disk 7 to rotate. This configuration ensures the smooth and controllable energy storage and release process. At the same time, the spline connection between the transmission sleeve 18 and the intermediate shaft 11 allows for axial relative displacement, so that while the bearing disk 7 rises with the screw nut 6, the transmission path can still maintain meshing and transmit torque. This design ensures the continuity of action and transmission reliability of the entire device during dynamic lifting and lowering.

[0045] If the lead of the nut 15 to be installed does not match that of the energy storage screw 3, resulting in an inconsistency between the lifting speed of the bearing plate 7 and the screw-in feed speed of the nut, it will lead to additional tightening force or support disengagement, and exacerbate thread wear. Therefore, if Figure 2As shown, in this embodiment, the transmission ratio between the upper gear 701 and the lower gear 301 is the same as the transmission ratio between gear 12 and gear 17, and the lead of the energy storage screw 3 is the same as the lead of the nut 15 to be installed. In this embodiment, the number of teeth and module of the upper gear 701 and the lower gear 301 are the same, and the number of teeth and module of gear 12 and gear 17 are the same, with an overall transmission ratio of 1:1; the lead of the energy storage screw 3 is equal to the thread lead value of the nut 15 to be installed. In practical applications, the energy storage screw 3 with the corresponding lead can be matched according to the nut specification, but this embodiment does not limit this. During operation, the vertical displacement generated by the bearing disk 7 rotating one revolution is exactly equal to the axial feed displacement of the nut 15 screwed into the pull rod 16 one revolution. With this setup, the displacement of the bearing plate 7 is strictly synchronized with the screw-in displacement of the nut. The supporting force of the device on the nut always acts in the positive axial direction, without generating an additional axial force that pushes upward or causing the support to detach. The threaded pair only bears normal engagement friction, with no off-center load, no misalignment wear, and no additional load. The thread fit is optimized, and the thread damage rate is significantly reduced compared to asynchronous structures.

[0046] like Figure 1 and Figure 5 As shown, in this embodiment, at least four retaining seats 702 are provided on the upper end face of the upper gear 701. Each retaining seat 702 has a retaining groove, and a lever 8 is inserted through the groove. The end of the lever 8 can extend into the nut 15 to be installed. Specifically, the upper gear 701 and the bearing plate 7 are integrally formed, with high overall coaxiality. The retaining seats 702 are evenly distributed along the circumference of the upper end face of the upper gear 701. The diameter of the arc of the outer surface of the retaining seat 702 is smaller than the diameter of the outer surface of the upper gear 701, thus forming a boss that allows gear 12 to rest on the upper gear 701. The retaining groove is used to position the lever 8. In this embodiment, four retaining seats 702 are provided, and the retaining groove is a U-shaped groove. After the lever 8 is inserted into the process hole of the nut 15 to be installed, it can enter from the top of the retaining groove, achieving circumferential fixation and multi-point centering. By setting multiple card holders 702 and levers 8, on the one hand, multi-point positioning ensures good coaxiality between the nut 15 to be installed and the bearing plate 7, preventing skewing at the beginning of nut installation and ensuring smooth screwing of the first thread. On the other hand, levers 8 provide a longer operating lever arm, allowing the operator to control the rotation speed of the bearing plate 7 more smoothly with less force, avoiding impact at the beginning of tightening, and enabling the nut and the thread of the pull rod 16 to mesh smoothly, further reducing the risk of damage to the threads.

[0047] To improve the flexibility of this device, such as Figure 1 , Figure 2 and Figure 3As shown, this embodiment also includes a locking member 9, which connects the lower gear 301 to the movable base plate 1. The locking member 9 can adopt a pin-type locking structure, capable of locking the lower gear 301 and the movable base plate 1 together, cutting off the power transmission of the entire transmission chain. In this embodiment, the locking member 9 adopts a plate-like structure, and the locking member 9 and the movable base plate 1 are rotatably connected via a damping hinge 19. During operation, after the coil spring 4 has stored energy, the locking member 9 lifts up and engages with the lower gear 301, keeping the transmission system stationary; after unlocking, the transmission system resumes power transmission. The locking member 9 can lock with the lower gear 301 after energy storage, thus reliably locking the entire transmission chain, preventing accidental energy release of the coil spring 4 in a non-operating state, ensuring safety before operation and stability of the device. It also provides a controllable "emergency stop" mechanism for mid-installation pauses, position adjustments, or handling of abnormal situations, making operation more flexible and safer.

[0048] Due to accumulated errors in the machining and assembly of components such as the energy storage screw 3, the lifting displacement and screwing displacement are not synchronized, resulting in additional tightening force that can cause thread jamming. To solve this technical problem, such as... Figure 5As shown, in this embodiment, the height of the bearing plate 7 can be adjusted. Specifically, multiple guide plates 601 are provided on the outer circumference of the lead screw nut 6. The ends of the guide plates 601 extend into the grooves 104 of the support column 101 of the support frame. The guide plates 601 can move up and down along the grooves 104 on the support frame. A connecting plate 602 is horizontally provided between two adjacent guide plates 601. The connecting plate 602 has an arc-shaped structure. A mounting seat 704 is provided at the lower part of the bearing plate 7 via a bearing. The mounting seat 704 is coaxially provided with the lead screw nut 6. A mounting groove 703 is provided on the lower surface of the mounting seat 704. The upper ends of the guide plates 601 extend into the corresponding mounting grooves 703. There is a gap between the guide plates 601 and the mounting seat 704. An adjusting screw 13 is vertically provided on the connecting plate 602. The end of the adjusting screw 13 can abut against the lower surface of the mounting seat 704. The adjusting screw 13 can push the mounting seat 704 to move upward. The adjustable screw 13 provides independent fine-tuning capability for the height of the bearing plate 7. This design can compensate for the slight deviation between the rising height of the screw nut 6 and the actual required screwing height caused by the cumulative manufacturing and assembly errors of components such as the energy storage screw 3 and gears. By adjusting the screw 13, the height of the bearing plate 7 relative to the screw nut 6 can be adjusted in real time, thereby dynamically eliminating the additional tightening force caused by errors between the nut thread and the pull rod 16 thread, effectively avoiding abnormal thread wear or jamming caused by accumulated errors. In order to detect the phenomenon of a sharp increase in friction between the threaded pairs in a timely manner, a pressure sensor is provided between the mounting groove 703 and the guide plate 601 in this embodiment. The pressure sensor is connected to a display. When the pressure value exceeds the set threshold, it indicates that there is an additional tightening force on the threaded pairs. The operator can make fine adjustments in a timely manner based on the value to avoid overloading the threaded pairs and ensure that the threads are always engaged within the safe load range, thereby improving the accuracy and timeliness of the adjustment of the bearing plate 7.

[0049] In this embodiment, rollers are provided on the lower part of the movable base plate 1, and three leveling screws 14 are vertically arranged on the movable base plate 1. Specifically, there are four rollers, and the three leveling screws 14 are distributed in a triangle on the movable base plate 1. Rotating the leveling screws 14 can lift the movable base plate 1, causing the rollers to leave the ground and completing the leveling adjustment of the device. During operation, the device is first moved to the working position by means of the rollers, and then the leveling screws 14 are adjusted to fix the device. At the same time, it is ensured that the nut and the pull rod 16 are coaxial, ensuring smooth screwing of the first thread and improving installation accuracy.

[0050] Example 2

[0051] This embodiment provides a method for installing a lower nut on a press, using the lower nut installation device from Embodiment 1, and includes the following steps:

[0052] S01: Insert the lever 8 into the nut 15 to be installed, and then suspend the nut 15 on the bearing plate 7;

[0053] S02: Unlock the locking part 9, rotate the upper gear 701, drive the energy storage screw 3 to rotate through the transmission component, and the coil spring 4 will generate elastic deformation to store energy until the bearing plate 7 rotates a set number of times, and lock the transmission component through the locking part 9.

[0054] S03: Move the base plate 1, rotate the leveling screw 14 so that the roller 106 leaves the ground, adjust the leveling screw 14 so that the nut 15 to be installed is aligned with the corresponding tie rod 16;

[0055] S04: Release the locking part 9, the coil spring 4 releases energy, the energy storage screw 3 drives the bearing plate 7 to rotate through the transmission assembly, and the screw nut 6 drives the bearing plate 7 to rise synchronously. The manual control of the rotation speed of the bearing plate 7 through the lever 8 ensures that the bearing plate 7 rotates at a uniform speed until the coil spring 4 no longer drives the energy storage screw 3 to rotate.

[0056] S05: Measure the distance between the lower end face of the nut 15 to be installed and the lower end face of the pull rod 16. If the distance does not meet the requirements, manually rotate the bearing plate 7 in the opposite or same direction using the lever 8 until the distance between the lower end face of the nut 15 to be installed and the lower end face of the pull rod 16 meets the installation requirements.

[0057] In S02, the number of turns is set to n. When the distance between the lower end face of the nut 15 to be installed and the lower end face of the tie rod 16 meets the requirements, the corresponding number of turns is m, where n > m. This is because when using the nut installation device of the press machine, the distance between the nut 15 to be installed and the tie rod 16 is not adjusted. The difference between n and m can be estimated based on the distance between the nut 15 to be installed and the tie rod 16 and the pitch.

[0058] In step S03, the transmitting unit of the laser alignment instrument is fixed to the lower end of the tension bolt, and the receiving unit is fixed to the center position of the bearing plate 7 (i.e., the center position of the nut 15 to be installed). The laser alignment instrument is turned on, and the position of the light spot on the receiving unit and the coaxiality deviation value are observed. According to the deviation value, the three leveling screws 14 are adjusted in sequence to gradually correct the horizontal position and tilt angle of the device until the coaxiality deviation displayed by the laser alignment instrument falls within the allowable range, thus completing the precise coaxial calibration of the nut 15 to be installed and the tension bolt.

[0059] In S04, when the display reading exceeds the set threshold range, the transmission assembly is locked by the locking member 9, and the adjusting screw 13 is adjusted to move the mounting base 704 downward until the reading decreases to the set threshold range. At the same time, while turning, the display reading is observed, and the rotation speed of the bearing plate 7 is reduced by applying a pulling force to the lever 8 to avoid the spring elastic potential energy being released too quickly, causing an impact between the nut and the pull rod 16, which would have an adverse effect on the thread.

[0060] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A nut mounting device for a press, comprising a movable base plate (1), wherein a support frame is further provided on the movable base plate (1), characterized in that, Also includes: Energy storage screw (3), the energy storage screw (3) is rotatably mounted on the movable base plate (1), the energy storage screw (3) is a ball screw; A lead screw nut (6) is provided on the energy storage lead screw (3). The lead screw nut (6) is slidably connected to the support frame. The lead screw nut (6) can be raised and lowered on the support frame. A coil spring (4) is sleeved on the energy storage screw (3). The two ends of the coil spring (4) are connected to the energy storage screw (3) and the support frame, respectively. When the energy storage screw (3) rotates, the coil spring (4) can store energy. When the coil spring (4) releases energy, it can drive the energy storage screw (3) to rotate in the opposite direction. The bearing plate (7) is rotatably mounted on the lead screw nut (6) and is used to drive the nut (15) to be installed to rotate and rise. The transmission assembly is mounted on the support frame. The two power ends of the transmission assembly are connected to the bearing disk (7) and the energy storage screw (3) respectively. The bearing disk (7) can drive the energy storage screw (3) to rotate through the transmission assembly. The energy storage screw (3) can also drive the bearing disk (7) to rotate in the opposite direction through the transmission assembly.

2. The press lower nut mounting device as described in claim 1, characterized in that, The transmission assembly includes an upper gear (701), which is sleeved on the outer ring of the bearing disk (7). The upper gear (701) meshes with a gear (12). A transmission sleeve (18) is coaxially arranged on the lower part of the gear (12). The gear (12) can be mounted on the upper gear (701). The transmission sleeve (18) is rotatably mounted on the support frame. An intermediate shaft (11) is splined inside the transmission sleeve (18). The intermediate shaft (11) is vertically and rotatably mounted on the movable base plate (1). A gear (17) is arranged on the intermediate shaft (11). The gear (17) meshes with a lower gear (301). The lower gear (301) is sleeved on the energy storage screw (3). The lower gear (301) can drive the energy storage screw (3) to rotate.

3. The press lower nut mounting device as described in claim 2, characterized in that, The transmission ratio between the upper gear (701) and the lower gear (301) is the same as the transmission ratio between the first gear (12) and the second gear (17), and the lead of the energy storage screw (3) is the same as the lead of the nut (15) to be installed.

4. The press lower nut mounting device as described in claim 3, characterized in that, The upper gear (701) and the bearing disk (7) are an integrated structure. The upper end face of the gear (12) is provided with at least four card seats (702). The card seats (702) are provided with card slots. A lever (8) is provided through the card slot. The end of the lever (8) can extend into the nut (15) to be installed.

5. The press lower nut mounting device as described in claim 4, characterized in that, It also includes a locking element (9) that can connect the lower gear (301) to the movable base plate (1).

6. The press lower nut mounting device as described in claim 5, characterized in that, Multiple guide plates (601) are provided on the outer circumference of the lead screw nut (6). The end of the guide plate (601) extends into the support frame and can move up and down along the slide groove (104) on the support frame. A connecting plate (602) is horizontally provided between two adjacent guide plates (601). A mounting seat (704) is rotatably provided on the lower part of the bearing plate (7). The mounting seat (704) is coaxially provided with the lead screw nut (6). A mounting groove (703) is provided on the lower surface of the mounting seat (704). The upper end of the guide plate (601) extends into the corresponding mounting groove (703). There is a gap between the guide plate (601) and the mounting groove (703). An adjusting screw (13) is vertically provided on the connecting plate (602). The end of the adjusting screw (13) can abut against the lower surface of the mounting seat (704). The adjusting screw (13) can push the mounting seat (704) to move upward.

7. The press lower nut mounting device as described in claim 6, characterized in that, A pressure sensor is provided between the mounting groove (703) and the guide plate (601), and the pressure sensor is connected to a display.

8. The press lower nut mounting device as described in claim 7, characterized in that, The lower part of the movable base plate (1) is provided with rollers (106), and three leveling screws (14) are vertically arranged on the movable base plate (1).

9. A method for installing a lower nut on a press, characterized in that, The press lower nut mounting device as described in claim 8 includes the following steps: S01: Insert the lever (8) into the nut (15) to be installed, and then hang the nut (15) to be installed on the bearing plate (7); S02: Unlock the locking member (9), rotate the upper gear (701), drive the energy storage screw (3) to rotate through the transmission assembly, and the coil spring (4) generates elastic deformation to store energy until the bearing plate (7) rotates a set number of times, and lock the transmission assembly through the locking member (9). S03: Move the movable base plate (1), rotate the leveling screw (14) so ​​that the roller (106) leaves the ground, adjust the leveling screw (14) so ​​that the nut (15) to be installed is aligned with the corresponding pull rod (16); S04: Release the locking member (9), the coil spring (4) releases energy, the energy storage screw (3) drives the bearing plate (7) to rotate through the transmission assembly, and the screw nut (6) drives the bearing plate (7) to rise synchronously. The manual control of the rotation speed of the bearing plate (7) through the lever (8) ensures that the bearing plate (7) rotates at a uniform speed until the coil spring (4) no longer drives the energy storage screw (3) to rotate. S05: Measure the distance between the lower end face of the nut (15) to be installed and the lower end face of the pull rod (16). If the requirements are not met, manually drive the bearing plate (7) to rotate in the opposite or same direction through the lever (8) until the distance between the lower end face of the nut (15) to be installed and the lower end face of the pull rod (16) meets the installation requirements.

10. The method for installing the lower nut of a press as described in claim 9, characterized in that, In S04, when the display reading exceeds the set threshold range, the transmission assembly is locked by the locking member (9), and the adjusting screw (13) is adjusted to move the mounting base (704) downward until the reading decreases to the set threshold range.

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