Foundation device and method of assembling a foundation device

Abstract

The application provides a ground device, which comprises a rotating drive shaft (1), a bearing chassis (3) and a joint bearing (7), the joint bearing (7) comprises an inner ring ball head (41) and a bearing outer ring (42), the inner ring ball head (41) is arranged inside the bearing outer ring (42) and is configured to be able to twist relative to the bearing outer ring (42); the rotating drive shaft (1) is connected with the inner ring ball head (41) together and the bearing chassis (3) is connected with the bearing outer ring (42) together; or, the rotating drive shaft (1) is connected with the bearing outer ring (42) together and the bearing chassis (3) is connected with the inner ring ball head (41) together. The application also provides an assembling method of the ground device. The ground device is suitable for high-precision instruments and equipment with high cleanliness requirements, has a workbench self-adaptability, and can realize tool-free manual fine adjustment of height and levelness.

Description

Technical Field

[0001] This invention relates to the field of adjustable foot pad technology, and more particularly to a foot pad device and a method for assembling the foot pad device. Background Technology

[0002] Anchor bolts, often appearing as support bolts, are common mechanical components used for leveling equipment. Typical anchor bolt systems consist of a screw / bolt and a base, using the rotation of the screw thread to adjust the equipment's height and level. Anchor bolts requiring high levelness adjustment are generally equipped with a steel swivel mechanism, and the base is made of elastomers such as nylon or rubber to provide shock absorption and impact suppression. However, when ordinary anchor bolt systems are used in GMP environments with high cleanliness requirements (controlling the types and quantities of dust particles, bacteria, etc., that interfere with the clean environment, and requiring periodic cleaning and maintenance with 75% medical alcohol as specified), the high coefficient of friction in the moving parts due to the use of soft plastic materials like rubber, and the high driving torque required to overcome friction, makes direct manual adjustment impossible. Tools must be used, which can easily introduce additional contaminants. Furthermore, the friction between hard and soft materials during adjustment can easily generate particles due to wear. Moreover, rubber and nylon plastics are susceptible to the effects of organic solvents such as alcohol and are therefore not resistant to alcohol wiping. Because the base of the instrument feet is made of soft plastic, a larger contact area with the desktop is needed to withstand the same load, resulting in an excessively large size and hindering the control of the instrument's overall dimensions. Furthermore, the soft rubber base of ordinary instrument feet is prone to deformation due to chemical aging and load fatigue, making it difficult to maintain consistent height and levelness, and thus compromising the accuracy of the instrument. For heavy-duty precision desktop instruments used in environments with high cleanliness requirements, the cleanliness control, functionality, and material requirements for the base feet are even higher, rendering ordinary rubber and polyurethane base devices unsuitable. Summary of the Invention

[0003] The purpose of this invention is to at least partially overcome the shortcomings of the prior art and provide a novel foot device.

[0004] Another objective of this invention is to provide a foot device suitable for precision instruments and equipment with high cleanliness requirements.

[0005] Another objective of this invention is to provide a footing device suitable for precision instruments and equipment that are sensitive to and require high levels of horizontal accuracy and spatial stability.

[0006] Another objective of this invention is to provide a foot device with adaptive work surface and tool-free manual fine-tuning of height and level.

[0007] The present invention also aims to provide a footing device that can withstand relatively higher dynamic load impacts and static loads at the same time, and can ensure that the footing device maintains its accuracy over a long period of time.

[0008] Another objective of this invention is to provide a method for assembling a foot device.

[0009] To achieve the above-mentioned objectives or one of them, the technical solution of the present invention is as follows:

[0010] A ground anchor device, the ground anchor device comprising:

[0011] The first part is configured to attach to the underside of the item to be supported; and

[0012] The second part, attached to the first part, is used to rest against the supporting surface.

[0013] The first part and the second part are attached together in a non-rigid connection manner.

[0014] According to one embodiment of the present invention, the foot device further includes a spherical bearing disposed between the first portion and the second portion, the spherical bearing including an inner ball head and an outer ring, the inner ball head being disposed inside the outer ring and configured to be able to rotate relative to the outer ring.

[0015] The first part is a rotary drive shaft, and the second part is a bearing chassis;

[0016] The rotary drive shaft is connected to the inner ring ball joint and the bearing base is connected to the outer ring of the bearing; or, the rotary drive shaft is connected to the outer ring of the bearing and the bearing base is connected to the inner ring ball joint.

[0017] According to one embodiment of the present invention, the rotary drive shaft is connected to the inner ring ball joint and the bearing chassis is connected to the outer ring of the bearing;

[0018] The mounting device also includes a bearing retaining ring located between the rotary drive shaft and the bearing chassis. The bearing retaining ring is fixedly connected to the bearing chassis so that the outer ring of the bearing is clamped between the bearing retaining ring and the bearing chassis.

[0019] According to one embodiment of the present invention, the foot device further includes a fixing block, which is fixedly connected to the rotary drive shaft such that the inner ball head is clamped between the rotary drive shaft and the fixing block.

[0020] According to one embodiment of the present invention, the vertically lower side of the rotary drive shaft has an inner groove, and a spindle extending vertically downward is located at the center of the inner groove;

[0021] The mandrel has a stepped portion on its outer periphery, and one side of the inner ball head abuts against the stepped portion; the mandrel has a recessed portion on its end face, and a portion of the fixing block is located in the recessed portion.

[0022] According to one embodiment of the present invention, the fixing block has a coaxial screw receiving portion and a central hole, and a fixing block step is provided on the outer side of the fixing block. The foot device further includes a central screw, and the center of the mandrel has a central screw hole. The central screw passes through the screw receiving portion and the central hole of the fixing block and is screwed into the central screw hole of the mandrel, such that the inner ball head is clamped between the step portion and the fixing block step.

[0023] According to one embodiment of the present invention, a receiving space is provided on the inner side of the bearing chassis for accommodating a mandrel, a spherical bearing, a retaining block, and a center screw; an outer step is provided on the outer side of the bearing chassis, and an inner step is provided on the outer side of the receiving space, wherein the outer ring of the bearing is clamped between the bearing retaining ring and the inner step.

[0024] According to one embodiment of the present invention, the bearing chassis has a plurality of screw through holes, the bearing retaining ring has a plurality of threaded holes, and the mounting device further includes a plurality of fixing screws, each fixing screw passing through a screw through hole and screwed into the threaded hole of the bearing retaining ring; and / or

[0025] The foot assembly also includes multiple floating pins and multiple compression springs. The bearing retaining ring is provided with multiple receiving through holes, and the bearing base is provided with multiple receiving blind holes. The number of floating pins, compression springs, receiving through holes, and receiving blind holes are the same. Each floating pin contacts a compression spring to form a component group, located in the hole group formed by a receiving through hole and a receiving blind hole, so that the compression spring abuts against the bearing base and the floating pin rotates on the shaft.

[0026] According to a preferred embodiment of the present invention, the rotary drive shaft comprises:

[0027] The screw section is located at the top of the rotary drive shaft;

[0028] The tool adjustment section, located below the screw section, is configured to rotate under the drive of the tool when the tool is attached to the tool adjustment section; and

[0029] The manual adjustment section, located below the screw section, is used for manual rotation.

[0030] According to one embodiment of the present invention, a plurality of screw through holes and a plurality of receiving blind holes are uniformly distributed along the circumference, and the plurality of screw through holes and the plurality of receiving blind holes are alternately distributed; and

[0031] Multiple threaded holes and multiple receiving through holes are evenly distributed along the circumference, and the multiple threaded holes and multiple receiving through holes are distributed alternately.

[0032] According to another aspect of the present invention, a method for assembling a footing device is provided, the footing device being as described in any of the foregoing embodiments, the assembly method comprising:

[0033] Fit the bearing retaining ring onto the spindle of the rotary drive shaft;

[0034] Place the spherical plain bearing onto the spindle of the rotary drive shaft, so that one side of the inner ball head of the spherical plain bearing abuts against the stepped part.

[0035] Place the fixing block into the recess of the spindle of the rotary drive shaft, and then screw the center screw through the screw receiving part and the center hole of the fixing block into the center screw hole of the spindle, so that the inner ball head is clamped between the step and the step of the fixing block.

[0036] Multiple floating pins are respectively placed into multiple receiving through holes of the bearing retaining ring;

[0037] Multiple compression springs are respectively placed into multiple blind holes in the bearing base;

[0038] Multiple compression springs are attached to the bearing chassis using a magnetic tool, and then the bearing chassis is inverted.

[0039] Align the center of the bearing base with the center of the bearing retaining ring, and then fit the bearing base onto the outer ring of the spherical plain bearing.

[0040] Rotate the bearing base so that each compression spring presses against a floating pin head, and align each screw through hole in the bearing base with a threaded hole in the bearing retaining ring;

[0041] The fixing screw is passed through the screw through hole and screwed into the threaded hole.

[0042] This invention provides a leveling device and its installation method. The leveling device is adaptable to different work surfaces, allowing it to adjust itself to ensure the supported instrument or equipment is level even in cases of localized unevenness. Furthermore, the device features tool-free manual fine-tuning of height and levelness, and is characterized by heavy load capacity, high rigidity, and stability. It is suitable for use in GMP workshops, Class 100 cleanrooms, and humid environments for precision instruments and equipment. It is applicable to industries such as bioengineering, precision manufacturing, and semiconductors, where high levels of cleanliness, levelness, and spatial stability are critical requirements for precision instruments and equipment.

[0043] The foot device of this invention enables tool-free, manual, precise adjustment of height and level on heavy-duty precision instruments and equipment, and can adapt to local unevenness on the tabletop to achieve maximum fit. The foot device has a compact structure and can simultaneously withstand relatively higher dynamic and static loads, ensuring that the device maintains high precision over extended periods. The foot device can be made of stainless steel that meets cleanroom usage standards, is corrosion-resistant, easier to clean with alcohol, and meets requirements for dirt control, such as preventing the generation of frictional particles.

[0044] During the handling of heavy precision instruments and equipment equipped with this footing device, the footing device can always remain upright under the action of compression springs and floating pins. When the instruments and equipment are placed horizontally, the bearing base of the footing device can float at a small angle, which minimizes the vector shear force in all directions of the instrument and equipment's gravity contact points in the horizontal plane, thereby avoiding plastic deformation of the material of the stressed parts of the instrument and equipment caused by excessive instantaneous impact torque.

[0045] Compared to ordinary ball joint foot devices, the foot device of this invention uses high-hardness, high-precision spherical bearings. When lubricated with grease (e.g., cleanroom-grade, low-volatility grease), the static and dynamic friction coefficients of the moving parts are lower. Therefore, under the same heavy load, a smaller driving force can be achieved, and even the rotary drive shaft can be manually driven without tools. Simultaneously, the spherical bearings used in the foot device of this invention have relatively higher motion precision and material rigidity, and can withstand the impact of the maximum static and dynamic loads under the same conditions. When the worktable or tabletop of the instrument or equipment is uneven (relatively poor flatness), the bearing base of this foot device can be flush with the worktable or tabletop to the greatest extent possible, achieving more mechanical contact support points at the microscopic level. Therefore, the load distribution is more uniform, and the instrument or equipment can be placed more stably.

[0046] Specifically, the material of the air-contacting part of the foot assembly of the present invention can be stainless steel with a highly corrosion-resistant surface treatment, thereby meeting the requirements for use in GMP workshops and high-specification (Class 100) clean rooms. Preferably, in the foot assembly of the present invention, except for the compression spring and the ball bearing, the other components can be made of stainless steel (e.g., SUS304, preferably passivated), the compression spring can be made of high-carbon steel (for inverted assembly with a magnetic tool), and the inner and outer rings of the ball bearing can be made of high-carbon chromium bearing steel. Compared with ordinary foot ball joint assemblies, the foot assembly of the present invention can withstand more loads and experience less micro-elastic deformation (submicron level), allowing instruments and equipment to maintain relatively higher spatial stability.

[0047] In summary, instruments and equipment using this foot device can achieve higher precision, accuracy, and stability in height and level adjustment more efficiently. It also boasts advantages such as small size, compact structure, and corrosion resistance, facilitating the design of more compact instruments and reducing space usage costs in GMP workshops and high-standard (Class 100) cleanrooms. Attached Figure Description

[0048] Figure 1 This is a schematic diagram of a foot device according to an embodiment of the present invention;

[0049] Figure 2 For the foot device according to an embodiment of the present invention Figure 1 A cross-sectional view taken from section AA in the diagram;

[0050] Figure 3 This is a perspective view of a foot support device according to an embodiment of the present invention, showing the bottom surface of the bearing chassis of the foot support device;

[0051] Figure 4 This is an exploded view of the foot device according to an embodiment of the present invention;

[0052] Figure 5 A perspective view of the rotary drive shaft of the foot device according to an embodiment of the present invention shows the interior of the rotary drive shaft of the foot device;

[0053] Figure 6 A perspective view of the bearing chassis of the foot device according to an embodiment of the present invention is shown, illustrating the top structure of the bearing chassis of the foot device;

[0054] Figure 7 A cross-sectional view of the joint bearing of the foot device according to an embodiment of the present invention;

[0055] Figure 8 A cross-sectional view of the fixing block of the anchor device according to an embodiment of the present invention; and

[0056] Figure 9 This is a flowchart illustrating the installation method of the foot device according to an embodiment of the present invention. Detailed Implementation

[0057] Exemplary embodiments of the present invention are described in detail below with reference to the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements. Furthermore, in the following detailed description, numerous specific details are set forth for ease of explanation to provide a thorough understanding of the embodiments disclosed herein. However, it will be apparent that one or more embodiments may be practiced without these specific details. In other instances, well-known structures and apparatuses are illustrated to simplify the drawings.

[0058] According to the general inventive concept of the present invention, a foot device is provided, the foot device comprising: a first portion configured for attachment to the underside of an object to be supported; and a second portion attached to the first portion for abutting against a support surface, wherein the first portion and the second portion are attached together in a non-rigid connection.

[0059] The following describes a foot device according to an embodiment of the present invention with reference to the accompanying drawings. In this embodiment, the foot device includes a rotary drive shaft 1, a bearing retaining ring 2, a bearing base 3, a fixing block 4, multiple floating pins 5, multiple compression springs 6, a spherical bearing 7, a center screw 8, multiple washers 9, and multiple fixing screws 10. The rotary drive shaft 1 is the first part, and the bearing base 3 is the second part. That is, the rotary drive shaft 1 is attached to the object to be supported. Here, the object to be supported can be any precision instrument or equipment, especially precision instruments or equipment with high requirements for cleanliness, horizontal accuracy, and spatial stability. The foot device is used to support such instruments or equipment. First, the foot device is installed on the lower surface of the instrument or equipment, and then the foot device is supported on the workbench surface.

[0060] The rotary drive shaft 1 and the bearing chassis 3 are arranged one above the other, with a bearing retaining ring 2 and a spherical bearing 7 designed between them. This allows the bearing chassis 3 to support the rotary drive shaft 1 while also allowing the rotary drive shaft 1 a certain degree of freedom of movement relative to the bearing chassis 3. Specifically, the spherical bearing 7 includes an inner ball head 41 and an outer bearing ring 42, as shown in the figure. Figure 2 , 7 As shown, the inner ring ball head 41 has a hollow through hole, thus forming an annular shape, and both its upper and lower end faces are flat planes. The outer circumferential surface of the annular shape is part of a spherical surface. The inner circumferential surface of the bearing outer ring 42 has an annular surface that matches the inner ring ball head 41, which is also part of a spherical surface. The inner ring ball head 41 is disposed inside the bearing outer ring 42 and is configured to be able to rotate relative to the bearing outer ring 42.

[0061] To facilitate the installation of the spherical plain bearing 7, the rotary drive shaft 1 can be connected to the inner ring ball joint 41, and the bearing base 3 can be connected to the outer ring 42 of the bearing, as follows: Figure 1 As shown; or alternatively, the rotary drive shaft 1 is connected to the outer ring 42 of the bearing and the bearing base 3 is connected to the inner ring ball head 41, which is not shown in the figure.

[0062] In the illustrated embodiment, the bearing retaining ring 2 is a disc with a hole in the middle, thus it is an annular disc. It is located between the rotary drive shaft 1 and the bearing base 3. The bearing retaining ring 2 needs to be fixedly connected to the bearing base 3 so that the outer ring 42 of the bearing is clamped between the bearing retaining ring 2 and the bearing base 3 (described in detail later). The bearing retaining ring 2 is provided with multiple receiving through holes 32, which are mainly used to receive the floating pin head 5. The bearing base 3 is provided with multiple receiving blind holes 21, which are mainly used to receive the compression spring 6. Of course, the compression spring 6 may also penetrate into the receiving through hole 32, or, when the foot device bears a load, the floating pin head 5 may also partially enter the receiving blind hole 21 under the load. The number of floating pins 5, compression springs 6, receiving through holes 32 and receiving blind holes 21 are the same; each floating pin 5 contacts a compression spring 6 to form a component group, located in the hole group formed by a receiving through hole 32 and a receiving blind hole 21, such that the compression spring 6 abuts against the bearing base 3 and the floating pin 5 abuts against the rotary drive shaft 1.

[0063] Advantageously, the floating pin head 5 is generally cylindrical with an arc-shaped upper end to form a point contact with the rotary drive shaft 1. Preferably, the diameter of the hole at one end (lower end) of the through hole 32 is a first diameter, and the diameter of the hole at the other end (upper end) is a second diameter, where the first diameter is larger than the second diameter. That is, a step is formed on the inner circumferential surface of the through hole 32, such as... Figure 2 , 6 As shown, this arrangement limits the upward movement of the floating pin 5 and the compression spring 6 because the diameter of the bottom of the pin 5 is larger than the diameter of its cylindrical portion, thus the floating pin 5 can be locked at the step within the receiving through hole 32.

[0064] The structure of the rotary drive shaft 1 is described in detail below. The rotary drive shaft 1 includes: a screw section 11 located at the upper part of the rotary drive shaft 1, through which the foot device can be screwed into the object to be supported; a tool adjustment section 12 located below the screw section 11, configured to rotate under the drive of a tool when the tool is attached to the tool adjustment section 12; and a manual adjustment section 13 located below the screw section 11 for manual rotation. The arrangement of the tool adjustment section 12 and the manual adjustment section 13 can be varied; for example, the tool adjustment section 12 may be located above the manual adjustment section 13, such as... Figure 1 As shown, or alternatively, the manual adjustment section 13 is located above the tool adjustment section 12, and the present invention does not limit this. In the illustrated embodiment, the manual adjustment section 13 may be provided with a groove for easy hand gripping to increase friction and prevent slippage. The tool adjustment section 12 is designed in the shape of a nut so that a driving tool such as a wrench can be engaged thereto drive the rotary drive shaft 1 to rotate.

[0065] The rotary drive shaft 1 has an inner groove 14 on its vertically lower side, and a spindle 15 extending vertically downward at the center of the inner groove 14; a stepped portion 16 is provided on the outer periphery of the spindle 15, and the diameter of the side of the spindle 15 near the screw section 11 is larger than the diameter of the side of the spindle 15 away from the screw section 11, and one side of the inner ring ball head 41 can abut against the stepped portion 16; a recessed portion 17 is provided on the end face of the spindle 15, a part of the fixing block 4 is located in the recessed portion 17, and a central screw hole 18 is provided at the center of the spindle 15.

[0066] The fixing block 4 is used for fixed connection with the rotary drive shaft 1, so that the inner ball head 41 is clamped between the rotary drive shaft 1 and the fixing block 4. The shape of the fixing block 4 is as follows: Figure 8 As shown, it has a coaxial screw receiving portion 51 and a central hole 52, and a fixing block step 53 on the outer side of the fixing block 4, such that the dimension of the side of the fixing block 4 near the rotary drive shaft 1 is smaller than the dimension of the side of the fixing block 4 away from the rotary drive shaft 1. It should be noted that in the illustrated embodiment, the side of the fixing block 4 near the rotary drive shaft 1 is square prism-shaped, while the side of the fixing block 4 away from the rotary drive shaft 1 is cylindrical, and correspondingly, the shape of the recess 17 is a square groove. As an alternative embodiment, the side of the fixing block 4 near the rotary drive shaft 1 can also be cylindrical, and correspondingly, the shape of the recess 17 is a circular groove. Obviously, the square prism and square groove designs are more advantageous because they can suppress the rotation of the rotary drive shaft 1 and the fixing block 4 during the fastening process.

[0067] As mentioned above, the foot device also includes a center screw 8, which passes through the screw receiving part 51 and the center hole 52 of the fixing block 4 and is screwed into the center screw hole 18 of the spindle 15, so that the inner ball head 41 is clamped between the step part 16 and the step 53 of the fixing block. The center screw 8 can be an internal hex screw.

[0068] With this design of the rotary drive shaft 1 and the fixing block 4, the inner ring ball head 41 can be tightly clamped onto the rotary drive shaft 1. Specifically, the smaller side of the fixing block 4 is approximately the same size as the recess 17 of the spindle 15. Therefore, this part of the fixing block 4 enters the recess 17, which clamps the inner ring ball head 41 between the step 16 and the step 53 of the fixing block, thereby achieving rigid fixation of the inner ring ball head 41 to the rotary drive shaft 1.

[0069] The structural form of bearing chassis 3 is described below, such as... Figure 2 , 3 As shown in Figure 6, the bearing base 3 has an inner receiving space 24 for accommodating the spindle 15, the spherical bearing 7, the fixing block 4, and the center screw 8; the bearing base 3 has an outer step 23 on the outer side, and an inner step 25 on the outer side of the receiving space 24 (see Figure 6). Figure 6The bearing outer ring 42 is clamped between the bearing retaining ring 2 and the inner step 25. The outer step 23 ensures that the bearing base 3 can penetrate deeply into the inner groove 14 of the rotary drive shaft 1, while maintaining that the outer circumferential diameter of the bottom of the rotary drive shaft 1 is approximately equal to the outer circumferential diameter of the exposed part of the bearing base 3. The inner step forms a step for clamping the bearing outer ring 42. Due to the presence of the inner step, the accommodating space 24 has an upper part with a diameter of A and a lower part with a diameter of B, where A is greater than B. The diameter A can be equal to or slightly larger than the outer circumferential diameter of the bearing outer ring 42. The inner circumferential diameter of the bearing retaining ring 2 and the diameter B of the lower part of the accommodating space 24 of the bearing base 3 are both smaller than the outer circumferential diameter of the bearing outer ring 42.

[0070] It should be noted that the outer circumferential diameter of the bearing retaining ring 2 and the outer circumferential diameter of the upper part of the bearing base 3 are both smaller than the diameter of the inner groove 14 of the rotary drive shaft 1. Therefore, the bearing base 3 and the bearing retaining ring 2 are allowed to have a certain amount of movement within the rotary drive shaft 1.

[0071] The bearing retaining ring 2 and the bearing base 3 are fixed together by multiple retaining screws 10, which also clamp the outer ring 42 of the bearing. Similarly, the retaining screws 10 can also be hex socket head cap screws. The bearing base 3 has multiple screw through holes 22, and the bearing retaining ring 2 has multiple threaded holes 31. Each retaining screw 10 passes through a screw through hole 22 and is screwed into the threaded hole 31 of the bearing retaining ring 2. Due to the presence of the inner step, such as Figure 6 As shown, when the bearing retaining ring 2 and the bearing base 3 are fixed by the fixing screw 10, the bearing outer ring 42 is tightly clamped between the bearing retaining ring 2 and the bearing base 3, thereby rigidly fixing the bearing retaining ring 2, the bearing base 3 and the bearing outer ring 42 together.

[0072] In the illustrated embodiment, the number of screw through holes 22, receiving blind holes 21, threaded holes 31, and receiving through holes 32 are all six. However, the present invention is not limited to this; their numbers can be other than these, as long as the number of screw through holes 22 and threaded holes 31 are the same, and the number of receiving blind holes 21 and receiving through holes 32 are the same. Furthermore, the number of screw through holes 22 and threaded holes 31 can be different from the number of receiving blind holes 21 and receiving through holes 32. Moreover, the multiple screw through holes 22 and multiple receiving blind holes 21 can be evenly distributed along the circumference, and the multiple screw through holes 22 and multiple receiving blind holes 21 can be distributed alternately; and the multiple threaded holes 31 and multiple receiving through holes 32 can be evenly distributed along the circumference, and the multiple threaded holes 31 and multiple receiving through holes 32 can be distributed alternately.

[0073] According to another aspect of the present invention, a method for assembling a base device is provided. The base device is as described in any of the foregoing embodiments. It should be noted that the assembly method for the base device can employ an inverted assembly method, that is, unlike the normal operating orientation of the base device (where the inner groove 14 of the rotary drive shaft 1 faces downwards and the rotary drive shaft 1 is above the bearing base 3), during assembly, the inner groove 14 of the rotary drive shaft 1 faces upwards, and the bearing base 3 is mounted on the rotary drive shaft 1 from above. The assembly method includes:

[0074] Place the bearing retaining ring 2 onto the spindle 15 of the rotary drive shaft 1;

[0075] The spherical plain bearing 7 (including an inner ball head 41 and an outer ring 42) is fitted onto the spindle 15 of the rotary drive shaft 1, so that one side of the inner ball head 41 of the spherical plain bearing 7 abuts against the stepped portion 16.

[0076] The fixing block 4 is placed into the recess 17 of the spindle 15 of the rotary drive shaft 1, and the center screw 8 (preferably coated with thread sealant to ensure sealing) is passed through the screw receiving part 51 and the center hole 52 of the fixing block 4 and screwed into the center screw hole 18 of the spindle 15, so that the inner ring ball head 41 is clamped between the step part 16 and the fixing block step 53; in this way, the rotary drive shaft 1, the inner ring ball head 41 of the spherical bearing 7 and the fixing block 4 are locked together as one unit;

[0077] Multiple floating pins 5 are respectively placed into multiple receiving through holes 32 of the bearing retaining ring 2;

[0078] Multiple compression springs 6 are respectively placed into multiple receiving blind holes 21 of the bearing base 3;

[0079] The bearing base 3 is inverted. Since it is an inverted assembly, in order to prevent the compression spring 6 from falling out of the receiving blind hole 21 of the bearing base 3, a material that can be attracted by a magnet (such as high carbon steel) can be used to make the compression spring 6. During assembly, a magnetic tool is used to keep the compression spring 6 in the receiving blind hole 21 of the bearing base 3 in the inverted state. The magnetic tool can act on the bottom surface of the bearing base 3.

[0080] Align the center of the bearing base 3 with the center of the bearing retaining ring 2, and then fit the bearing base 3 onto the outer ring 42 of the spherical plain bearing 7; the bearing base 3 and the outer ring 42 of the spherical plain bearing 7 can be clearance fit, and the clearance can be, for example, 0-30um.

[0081] Rotate the bearing base 3 so that each compression spring 6 presses on a floating pin head 5 and aligns each screw through hole 22 of the bearing base 3 with a threaded hole 31 of the bearing retaining ring 2.

[0082] The fixing screw 10 (preferably coated with thread sealant to ensure sealing) is passed through the screw through hole 22 and screwed into the threaded hole 31; in addition, a washer 9 can be fitted on the fixing screw 10, and the fixing screw 10 is tightened so that the bearing retaining ring 2 and the bearing base 3 hold and position the bearing outer ring 42 of the spherical bearing 7, thereby completing the assembly of the entire foot device.

[0083] This invention provides a leveling device and its installation method. The leveling device is adaptable to different work surfaces, allowing it to adjust itself to ensure the supported instrument or equipment is level even in cases of localized unevenness. Furthermore, the device features tool-free manual fine-tuning of height and levelness, and is characterized by heavy load capacity, high rigidity, and stability. It is suitable for use in GMP workshops, Class 100 cleanrooms, and humid environments for precision instruments and equipment. It is applicable to industries such as bioengineering, precision manufacturing, and semiconductors, where high levels of cleanliness, levelness, and spatial stability are critical requirements for precision instruments and equipment.

[0084] The foot device of this invention enables tool-free, manual, precise adjustment of height and level on heavy-duty precision instruments and equipment, and can adapt to local unevenness on the tabletop to achieve maximum fit. The foot device has a compact structure and can simultaneously withstand relatively higher dynamic and static loads, ensuring that the device maintains high precision over extended periods. The foot device can be made of stainless steel that meets cleanroom usage standards, is corrosion-resistant, easier to clean with alcohol, and meets requirements for dirt control, such as preventing the generation of frictional particles.

[0085] During the handling of heavy precision instruments and equipment equipped with this footing device, the footing device can always remain upright under the action of compression springs and floating pins. When the instruments and equipment are placed horizontally, the bearing base of the footing device can float at a small angle (e.g., ±5°), which minimizes the vector shear force in all directions of the instrument and equipment's gravity contact points in the horizontal plane, thereby avoiding plastic deformation of the material of the stressed parts of the instrument and equipment caused by excessive instantaneous impact torque.

[0086] Compared to ordinary ball joint foot devices, the foot device of this invention uses high-hardness, high-precision spherical bearings. When lubricated with grease (e.g., cleanroom-grade, low-volatility grease), the static and dynamic friction coefficients of the moving parts are lower. Therefore, under the same heavy load, a smaller driving force can be achieved, and even the rotary drive shaft can be manually driven without tools. Simultaneously, the spherical bearings used in the foot device of this invention have relatively higher motion precision and material rigidity, and can withstand the impact of the maximum static and dynamic loads under the same conditions. When the worktable or tabletop of the instrument or equipment is uneven (relatively poor flatness), the bearing base of this foot device can be flush with the worktable or tabletop to the greatest extent possible, achieving more mechanical contact support points at the microscopic level. Therefore, the load distribution is more uniform, and the instrument or equipment can be placed more stably.

[0087] Specifically, the material of the air-contacting part of the foot assembly of the present invention can be stainless steel with a highly corrosion-resistant surface treatment, thereby meeting the requirements for use in GMP workshops and high-specification (Class 100) clean rooms. Preferably, in the foot assembly of the present invention, except for the compression spring and the ball bearing, the other components can be made of stainless steel (e.g., SUS304, preferably passivated), the compression spring can be made of high-carbon steel (for inverted assembly with a magnetic tool), and the inner and outer rings of the ball bearing can be made of high-carbon chromium bearing steel. Compared with ordinary foot ball joint assemblies, the foot assembly of the present invention can withstand more loads and experience less micro-elastic deformation (submicron level), allowing instruments and equipment to maintain relatively higher spatial stability.

[0088] In summary, instruments and equipment using this foot device can achieve higher precision, accuracy, and stability in height and level adjustment more efficiently. It also boasts advantages such as small size, compact structure, and corrosion resistance, facilitating the design of more compact instruments and reducing space usage costs in GMP workshops and high-standard (Class 100) cleanrooms.

[0089] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that variations may be made to these embodiments without departing from the principles and spirit of the invention. The scope of the invention is defined by the appended claims and their equivalents.

[0090] List of reference numerals in the attached diagram:

[0091] 1 rotary drive shaft

[0092] 2 Bearing retaining ring

[0093] 3-bearing chassis

[0094] 4 fixed blocks

[0095] 5 floating pins

[0096] 6 compression springs

[0097] 7-joint bearing

[0098] 8 center screws

[0099] 9 gaskets

[0100] 10 fixing screws

[0101] 11 screw sections

[0102] 12 tool adjustment sections

[0103] 13 manual adjustment sections

[0104] 14 Inner Grooves

[0105] 15 spindles

[0106] 16 steps

[0107] 17. Depression

[0108] 18 center screw holes

[0109] 21 accommodates blind holes

[0110] 22 screw through hole

[0111] 23 outer steps

[0112] 24-room capacity

[0113] 25 inner steps

[0114] 31 threaded hole

[0115] 32 accommodates through holes

[0116] 41 Inner circle ball head

[0117] 42 bearing outer ring

[0118] 51 Screw Receiving Section

[0119] 52 center hole

[0120] 53 Fixed block steps.

Claims

1. A ground anchor device, characterized by The foot device comprises: a first part configured to be attached below an article to be supported; and a second part attached to the first part for abutting against a supporting surface, wherein the first part and the second part are attached together in a non-rigid connection; The foot device further comprises a joint bearing (7) arranged between the first part and the second part, the joint bearing (7) comprising an inner ring ball head (41) and a bearing outer ring (42), the inner ring ball head (41) being arranged inside the bearing outer ring (42) and being configured to be able to twist relative to the bearing outer ring (42); The first part is a rotating shaft (1), and the second part is a bearing chassis (3); The rotating shaft (1) and the inner ring ball head (41) are connected together, and the bearing chassis (3) and the bearing outer ring (42) are connected together; The foot device further comprises a bearing fixing ring (2), which is a disc with a hole in the middle, located between the rotating shaft (1) and the bearing chassis (3), the bearing fixing ring (2) is fixedly connected with the bearing chassis (3) so that the bearing outer ring (42) is clamped between the bearing fixing ring (2) and the bearing chassis (3); The bearing chassis (3) has a plurality of screw through holes (22), the bearing fixing ring (2) has a plurality of threaded holes (31), and the foot device further comprises a plurality of fixing screws (10), each fixing screw (10) passes through one screw through hole (22) and is screwed on the threaded hole (31) of the bearing fixing ring (2); The foot device further comprises a plurality of floating pin heads (5) and a plurality of compression springs (6), the bearing fixing ring (2) is provided with a plurality of accommodating through holes (32), and the bearing chassis (3) is provided with a plurality of accommodating blind holes (21); the number of floating pin heads (5), compression springs (6), accommodating through holes (32) and accommodating blind holes (21) is the same; each floating pin head (5) and one compression spring (6) form a component group in contact, located in a hole group formed by one accommodating through hole (32) and one accommodating blind hole (21), so that the compression spring (6) abuts against the bearing chassis (3) and the floating pin head (5) abuts against the rotating shaft (1); the diameter of the hole at one end of the accommodating through hole is a first diameter, and the diameter of the hole at the other end is a second diameter, the first diameter is greater than the second diameter, and a step is formed on the inner circumferential surface of the accommodating through hole.

2. The foot device according to claim 1, wherein: The foot device further comprises a fixing block (4), the fixing block (4) is fixedly connected with the rotating shaft (1) so that the inner ring ball head (41) is clamped between the rotating shaft (1) and the fixing block (4).

3. The foot device according to claim 2, wherein: The vertical lower side of the rotating shaft (1) has an inner groove (14), and a core shaft (15) vertically downwardly extends in the center of the inner groove (14); A stepped portion (16) is provided on the outer periphery of the mandrel (15), and the inner ring ball head (41) abuts against the stepped portion (16) on one side. A recessed portion (17) is provided on the end surface of the mandrel (15), and a portion of the fixing block (4) is located in the recessed portion (17).

4. The foot according to claim 3, wherein: The fixing block (4) has a coaxial screw receiving portion (51) and a center hole (52), and a fixing block step (53) is provided on the outer side of the fixing block (4). The foot further comprises a center screw (8), and the center of the mandrel (15) has a center screw hole (18). The center screw (8) is screwed through the screw receiving portion (51) and the center hole (52) of the fixing block (4) and is screwed into the center screw hole (18) of the mandrel (15), so that the inner ring ball head (41) is clamped between the stepped portion (16) and the fixing block step (53).

5. The foot according to claim 4, wherein: A receiving space (24) is provided on the inner side of the bearing base (3), and the receiving space (24) is used to accommodate the mandrel (15), the knuckle bearing (7), the fixing block (4) and the center screw (8). An outer side step (23) is provided on the outer side of the bearing base (3), and an inner side step (25) is provided on the outer side of the receiving space (24). The bearing outer ring (42) is clamped between the bearing fixing ring (2) and the inner side step (25).

6. An anchor assembly according to claim 5, wherein The rotary drive shaft (1) comprises: A screw rod segment (11) is located at the upper part of the rotary drive shaft (1); A tool adjusting segment (12) is located on the lower side of the screw rod segment (11) and is configured to be able to rotate under the drive of the tool when the tool is attached to the tool adjusting segment (12); and A manual adjusting segment (13) is located on the lower side of the screw rod segment (11) and is used to rotate under manual drive.

7. A method of assembling a ground anchor, characterized by, The foot is the foot according to claim 6, and the assembly method comprises: The bearing fixing ring (2) is sleeved on the mandrel (15) of the rotary drive shaft (1); The knuckle bearing (7) is sleeved on the mandrel (15) of the rotary drive shaft (1), so that the inner ring ball head (41) of the knuckle bearing (7) abuts against the stepped portion (16) on one side; The fixing block (4) is placed in the recessed portion (17) of the mandrel (15) of the rotary drive shaft (1), and then the center screw (8) is screwed through the screw receiving portion (51) and the center hole (52) of the fixing block (4) and is screwed into the center screw hole (18) of the mandrel (15), so that the inner ring ball head (41) is clamped between the stepped portion (16) and the fixing block step (53); A plurality of floating pin heads (5) are respectively placed in a plurality of receiving through holes (32) of the bearing fixing ring (2); A plurality of compression springs (6) are respectively placed in a plurality of receiving blind holes (21) of the bearing base (3); The plurality of compression springs (6) are adsorbed in the bearing base (3) by using a magnetic tool, and then the bearing base (3) is inverted; The center of the bearing base (3) is aligned with the center of the bearing fixing ring (2), and then the bearing base (3) is sleeved on the bearing outer ring (42) of the knuckle bearing (7); The foot is the foot according to claim 6, and the assembly method comprises: The rotating bearing chassis (3) is such that each compression spring (6) presses on one floating pin head (5) and each screw through hole (22) of the bearing chassis (3) is aligned with one threaded hole (31) of the bearing fixing ring (2); The fixing screw (10) is screwed through the screw through hole (22) on the threaded hole (31).

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