Visual unreachable closing and slow releasing device

Abstract

The invention provides a visual unreachable closing and slow releasing device, and relates to the technical field of closing and slow releasing devices, the visual unreachable closing and slow releasing device comprises a support, the support is used for supporting the whole device, and the device can be fixed on the front end face of a closing section through screws and four threaded holes in the lower portion; the threaded sleeve is fixed to the support in a welded mode, threads are arranged on the inner wall of the threaded sleeve, a lead screw is connected to the inner wall of the threaded sleeve in a threaded mode, and the lead screw can move in the vertical direction in the threaded sleeve through rotation; the lifting ring is fixed with the screw rod through a pin; according to the bearing closing device, slow descending of the closing section can be achieved, impact on the separable bearing at the blind area position cannot be caused, the situation that when a bearing rolling body is not closed in place, the bearing rolling body and a bearing outer ring are subjected to relative impact damage is avoided, and then the product quality is improved; whether assembly is in place or not can be judged by observing the in-place condition of the limiting device.

Description

Technical Field

[0001] This invention relates to the field of closing and releasing devices, and in particular to a closing and releasing device that is not visually accessible. Background Technology

[0002] Aero engines have a variety of components and a complex overall structure. In their segmented design, the use of separable bearings is inevitable. However, during the segment assembly process, separable bearings are often located in blind spots that are not visible to the naked eye, making it difficult to directly observe their installation status.

[0003] This situation, where the bearing is not visible to the naked eye, can easily lead to problems during the closing operation: if the closing speed is too fast, it may cause the bearing rolling elements to collide with the inner or outer ring of the bearing; at the same time, it is also difficult to determine whether the separable bearing is properly assembled, and there are potential quality hazards such as the rolling elements not being properly closed, which will affect the assembly quality and operational safety of the aero-engine.

[0004] Therefore, in order to avoid problems such as bumping or improper assembly of the separable bearings due to improper operation during assembly, there is an urgent need for a slow-release device suitable for scenarios where it is not visible to the naked eye, so as to achieve slow and precise assembly of the closing section. Summary of the Invention

[0005] The technical problem this invention aims to solve is that in its segmented design, the use of separable bearings is unavoidable. However, during the segment assembly process, the separable bearings are often located in a blind spot, making it difficult to directly observe their installation status. This lack of visual visibility can easily lead to problems during the assembly operation: if the assembly speed is too fast, the bearing rolling elements may collide with the inner or outer ring of the bearing; simultaneously, it is difficult to determine whether the separable bearing is properly assembled, posing potential quality hazards such as incomplete retraction of the rolling elements, affecting the assembly quality and operational safety of the aero-engine. Therefore, to avoid the problem of separable bearings colliding or being improperly assembled due to improper operation during assembly: in previous assembly methods, the installation status of the separable bearings in the blind spot could not be checked, making it impossible to determine whether they were properly installed. Improper operation could lead to incomplete retraction of the bearing rolling elements and collision with the outer ring of the bearing, resulting in potential quality hazards. Therefore, this invention proposes a device for slow-release assembly in a blind spot.

[0006] The technical solution adopted by this invention to solve its technical problem is: a device for closing and slowly releasing that is not visible to the naked eye, characterized in that it comprises:

[0007] The bracket has a frame structure and four threaded holes at its bottom. The bracket is fixed to the front end face of the closing section by screws passing through the threaded holes, forming the basic support of the device.

[0008] A screw sleeve is welded vertically to the top crossbeam of the support. Its inner wall is provided with internal threads, and a lead screw is inserted inside the screw sleeve. The lead screw and the screw sleeve form a helical transmission pair through threaded engagement. When the lead screw rotates around its own axis, it moves up and down along the axial direction (vertical direction) of the screw sleeve.

[0009] The lifting ring is detachably connected to the top of the lead screw by a pin and is located above the threaded sleeve.

[0010] A pressure sleeve is fitted onto the lower section of the lead screw, located below the threaded sleeve. The pressure sleeve and the lead screw are axially limited by a retaining ring through a hole to prevent the pressure sleeve from coming off the bottom end of the lead screw.

[0011] A hinge bearing is fitted into the inner hole of the pressure sleeve, with its outer ring fixed to the pressure sleeve and its inner ring fitting against the outer peripheral wall of the lead screw, so that the pressure sleeve remains stationary when the lead screw rotates.

[0012] A limiting device is sleeved on the lead screw and located between the threaded sleeve and the pressure sleeve, and is used to abut against the bottom of the threaded sleeve during the descent of the lead screw to limit its maximum descent distance.

[0013] The effects achieved by the above components are as follows: First, after measuring the installation distance, use hexagonal set screws to fasten the two incomplete semi-rings of the limiting device to the lead screw through the threaded holes at both ends; use screws to fix the device to the front end face of the closing section through the four threaded holes below the bracket; use the crane hook to hook the lifting ring and lift the entire component; when the assembly reaches directly above the closing section, the crane slowly descends to the part where the split bearing is about to be engaged; rotate the handle, which in turn drives the lead screw to rotate, the screw sleeve is fixed on the bracket, and the pressure sleeve contains a hinge bearing. As the lead screw rotates, the entire assembly component can be slowly lowered until the entire component is assembled in place, and the split bearing can be assembled in place; at the same time, the size and structure of the bracket can be adjusted to meet different closing assembly components.

[0014] Preferably, the limiting device is composed of two symmetrical semi-rings joined together. The inner hole of the semi-ring is provided with an internal thread that is compatible with the lead screw. The mating ends of the two semi-rings are respectively provided with radial threaded holes. The two semi-rings are locked to the outer circumference of the lead screw by passing an internal hexagon set screw through the threaded hole, forming a limiting structure that can be adjusted and fixed in position along the axial direction of the lead screw.

[0015] The effect achieved by the above components is that by setting a limiting device, two incomplete half-rings can be fastened to the lead screw through the threaded holes at both ends using an internal hexagon set screw, thereby limiting the lead screw during the descent process.

[0016] Preferably, it further includes a lubrication device, the lubrication device comprising:

[0017] A hollow ring, which is circular and coaxially sleeved on the outer circumference of a threaded sleeve, has its outer ring wall welded and fixed to the outer wall of the threaded sleeve. An oil storage cavity is formed inside the ring body of the hollow ring. One side of the ring wall has an insertion hole communicating with the oil storage cavity, and the other side of the ring wall has multiple discharge holes communicating with the oil storage cavity.

[0018] A first film is fixedly connected to the opening of the insertion hole, and a second film is fixedly connected to the opening of the discharge hole.

[0019] A threaded rod is welded radially to the outer ring wall of the insertion hole, and its interior is provided with an internal thread coaxial with the insertion hole.

[0020] The insertion rod has an external thread in the middle section of its body, which is screwed into the screw hole rod through the threaded engagement. The diameter of the insertion rod is adapted to the insertion hole, and its end can pass through the insertion hole and pierce the first membrane to extend into the oil storage cavity.

[0021] The piston plate is circular and has a sealing sliding fit with the inner wall of the oil storage cavity of the hollow ring, and can slide along the circumferential direction of the oil storage cavity (the axial direction of the hollow ring).

[0022] An annular cylinder is coaxially fixed to the inner ring wall of a hollow ring. Its cylinder wall completely covers the discharge hole and the second film. Multiple spherical holes distributed circumferentially are opened on the cylinder wall of the annular cylinder, and the holes connect the inner and outer sides of the annular cylinder.

[0023] The effect achieved by the above-mentioned components is as follows: By setting up a lubrication device, when lubrication of the lead screw is required, the insert rod is manually unscrewed from the screw hole, and then moved into the insertion hole on the hollow ring. This causes the insert rod to break the first diaphragm and contact the piston plate. At this time, the insert rod is manually pressed, causing it to push the piston plate to slide inside the hollow ring. During the sliding process, the piston plate squeezes the lubricating oil inside the hollow ring, causing the lubricating oil to break through the second diaphragm and enter the annular cylinder under pressure. After entering the annular cylinder, the lubricating oil is discharged through multiple holes and then sprayed onto the lead screw and flows naturally to other parts of the lead screw, thereby completing the lubrication treatment of the lead screw. This reduces the situation where the lead screw is not in contact with the lubricating oil in some parts due to the tight fit between the lead screw and other components, which affects the lubrication effect. This improves the convenience and efficiency of lubrication of the lead screw.

[0024] Preferably, a cross-shaped auxiliary groove is formed on the side surface of the second film facing the annular cylinder, and the thickness of the bottom of the auxiliary groove is less than the thickness of other areas of the second film.

[0025] The effect achieved by the above components is that by setting the auxiliary groove, the strength of the second film can be reduced, making it easier for the lubricating oil inside the hollow ring to break through the second film after being subjected to force.

[0026] Preferably, each spherical hole in the annular cylinder contains a steel ball, the diameter of which is slightly smaller than the inner diameter of the hole, and part of the spherical surface of the steel ball extends out of the hole and rolls against the outer peripheral wall of the lead screw.

[0027] The effect achieved by the above components is as follows: by setting steel balls, when the lead screw rotates, the steel balls can be driven to roll inside the hole of the annular cylinder, so that the steel balls come into contact with the lubricating oil inside the annular cylinder while rolling, and apply it to the lead screw, so that the lead screw can be continuously lubricated and the uniformity of lubrication of the lead screw can be increased.

[0028] Preferably, a plurality of anti-slip strips are fixedly attached to the outer peripheral wall of the gripping end of the insertion rod, and the anti-slip strips protrude radially along the insertion rod.

[0029] The effect achieved by the above components is that by setting anti-slip strips, the friction and resistance between the hand and the surface of the insertion rod can be increased, reducing the chance of slipping when manually rotating the insertion rod.

[0030] Preferably, a magnetic ring is fixed to the edge of the insertion hole of the hollow ring, and the insertion rod is made of a magnetically attractable metal material. After the insertion rod is inserted into the insertion hole, it is attracted and fixed with the magnetic ring.

[0031] The effect achieved by the above-mentioned components is as follows: by setting up a magnetic ring, when the insertion rod moves to the position of being fully inserted into the hollow ring, the insertion rod is brought into contact with the magnetic ring and is attracted and fixed by the magnetic ring, so that the insertion rod can stay directly inside the hollow ring after the operation is completed, and can be quickly stored, improving the convenience of operation.

[0032] Preferably, a positioning rod extending in the circumferential direction is fixedly connected to the inner wall of the oil storage cavity of the hollow ring, and a guide hole adapted to the positioning rod is opened on the piston plate. The positioning rod passes through the guide hole and guides the piston plate to slide linearly in the circumferential direction.

[0033] The effect achieved by the above components is that by setting a positioning rod, the positioning rod can be placed inside the hole of the piston plate to limit its movement, thereby reducing the risk of the piston plate tilting when pushed by the insertion rod, which could lead to jamming during its sliding process.

[0034] The beneficial effects of this invention are:

[0035] 1. This invention, after first measuring the installation distance, uses hexagonal set screws to fasten the two incomplete semi-rings of the limiting device to the lead screw through the threaded holes at both ends; using screws, the device is fixed to the front end face of the closing section through the four threaded holes below the bracket; using a crane hook to hook the lifting ring, the entire component is lifted; when the assembly reaches directly above the closing section, the crane slowly descends to the part where the split bearing is about to be engaged; rotating the handle drives the lead screw to rotate, the screw sleeve is fixed to the bracket, and the pressure sleeve contains a hinge bearing. As the lead screw rotates, the entire assembly component can slowly fall until the entire component is assembled in place, at which point the split bearing is assembled in place; at the same time, the size and structure of the bracket can be adjusted to meet different closing assembly components.

[0036] 2. In this invention, when lubrication of the lead screw is required, the insert rod is manually unscrewed from the screw hole, and then moved into the insertion hole on the hollow ring. This causes the insert rod to break the first diaphragm and contact the piston plate. At this time, the insert rod is manually pressed, causing it to push the piston plate to slide inside the hollow ring. During the sliding process, the piston plate squeezes the lubricating oil inside the hollow ring, causing the lubricating oil to break through the second diaphragm and enter the annular cylinder under pressure. After entering the annular cylinder, the lubricating oil is discharged through multiple holes and sprayed onto the lead screw, then flows naturally to other parts of the lead screw. At the same time, as the lead screw rotates, it drives the steel balls to roll inside the holes of the annular cylinder. As the steel balls roll, they come into contact with the lubricating oil inside the annular cylinder and coat the lead screw, ensuring continuous lubrication and increasing the uniformity of lubrication, thus completing the lubrication process for the lead screw.

[0037] 3. This invention enables the slow descent of the closing section, which will not impact the separable bearing in the blind zone, and avoids relative impact damage between the bearing rolling elements and the outer ring of the bearing when the bearing rolling elements are not fully closed, thereby improving product quality. In addition, the lead screw has a limit device, and the assembly status can be determined by observing the position of the limit device. Attached Figure Description

[0038] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0039] Figure 1 A three-dimensional structural diagram of a device for slow-release and closing that is not visible to the naked eye is provided for the present invention;

[0040] Figure 2 A partial cross-sectional view of the pressure sleeve of a device for slow closing and releasing that is not visually accessible in this invention;

[0041] Figure 3 This invention proposes a device for slow-release and closing that is not visually accessible. Figure 1 A schematic diagram of a partial three-dimensional structure;

[0042] Figure 4A partial cross-sectional view of a hollow ring for a device that allows for slow closing and release that is not visually accessible in this invention;

[0043] Figure 5 A partial cross-sectional view of the annular cylinder of the present invention, which is an inaccessible device for slow-release and closing.

[0044] Figure 6 This invention presents a three-dimensional structural diagram of a steel ball used in a device for slow-release and closing that is not visually accessible.

[0045] Legend: 1. Lifting ring; 2. Handle; 3. Screw sleeve; 4. Bracket; 5. Lead screw; 6. Pressure sleeve; 7. Hinge bearing; 8. Screw; 9. Limiting device; 10. Lubrication device; 101. Hollow ring; 102. Annular cylinder; 103. Piston plate; 104. First diaphragm; 105. Second diaphragm; 106. Screw hole rod; 107. Insert rod; 108. Anti-slip strip; 109. Magnetic ring; 110. Steel ball; 111. Positioning rod; 112. Auxiliary groove. Detailed Implementation

[0046] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0047] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0048] Figure 1-2The device shown is a visually inaccessible, slowly closing and releasing mechanism, comprising: a bracket 4 for supporting the entire device, which can be fixed to the front end face of the closing section using screws 8 through four threaded holes below; a screw sleeve 3, which is fixed to the bracket 4 by welding, and has threads on its inner wall, with a lead rod 5 threadedly connected to the inner wall of the screw sleeve 3, wherein the lead rod 5 can move vertically inside the screw sleeve 3 by rotation; a lifting ring 1, which is fixed to the lead rod 5 by a pin; a pressure sleeve 6, which is sleeved on the lead rod 5, wherein the pressure sleeve 6 and the lead rod 5 are prevented from dislodging from the lead rod 5 by a retaining ring with a hole; a hinge bearing 7, which is placed between the pressure sleeve 6 and the lead rod 5, wherein the hinge bearing 7 is placed inside the pressure sleeve 6 to ensure that the pressure sleeve 6 and the section to be closed remain stationary when the lead rod 5 rotates; and a limiting device 9, which is set in... On the lead screw, to limit the movement distance of the lead screw 5 during its descent, after first measuring the installation distance, use the internal hexagon set screw to fasten the two incomplete half rings of the limiting device 9 to the lead screw 5 through the threaded holes at both ends; use screws 8 to fix the device to the front end face of the closing section through the four threaded holes below the bracket 4; use the crane hook to hang the lifting ring 1 and lift the entire component; when the assembly reaches directly above the closing section, the crane slowly descends to the part where the split bearing is about to be engaged; rotate the handle 2, thereby driving the lead screw 5 to rotate, the screw sleeve 3 is fixed on the bracket 4, and the pressure sleeve 6 contains the hinge bearing 7. As the lead screw 5 rotates, the entire assembly component can slowly fall until the entire component is assembled in place, and the split bearing can be assembled in place; at the same time, the size and structure of the bracket 4 can be adjusted to meet different closing assembly components.

[0049] Figure 2 The limiting device 9 shown consists of two incomplete semi-rings, with threads in the inner holes of the semi-rings. The limiting device 9 is fastened to the lead screw 5 by using hexagon set screws through the threaded holes at both ends. By setting the limiting device 9, the two incomplete semi-rings can be fastened to the lead screw 5 by using hexagon set screws through the threaded holes at both ends, thereby limiting the lead screw 5 during the descent process.

[0050] Figure 3-6The device also includes: a lubrication device 10, comprising: a hollow ring 101, which is welded and fixed to the threaded sleeve 3; the hollow ring 101 has a discharge hole and an insertion hole; a first film 104 is fixedly connected to the inner wall of the insertion hole, and a second film 105 is fixedly connected to the inner wall of the discharge hole; the hollow ring 101 is filled with lubricating oil; a threaded rod 106 is fixedly connected to the hollow ring 101; and an insertion rod 107, which has a partial thread, and the insertion rod 107 is threaded to the inner wall of the threaded rod 106 through the partial thread. The insert rod 107 is made of a magnetically oriented metal material, and its size and shape are adapted to the inner wall of the insertion hole on the hollow ring 101. A piston plate 103 is placed inside the hollow ring 101 and slides up and down; its overall size and shape are adapted to the inner wall of the hollow ring 101. An annular cylinder 102 is fixed to the inner side of the hollow ring 101, completely covering the discharge hole and the second diaphragm 105 on the hollow ring 101. The annular cylinder 102 has multiple holes, the inner wall of which has a spherical cross-section. A lubrication device 10 is provided so that when lubrication of the lead screw 5 is required, the insert rod 107 is manually unscrewed from the screw hole 106. The insert rod 107 is then moved into the insertion hole on the hollow ring 101, causing it to break the first diaphragm 104 and contact the piston plate 103. At this point, the insert rod 107 is manually pressed, causing it to push the piston plate 103 into the hollow ring 101, whereby the piston plate 103 slides within the hollow ring 101. During the sliding process, the lubricating oil inside the hollow ring 101 is squeezed, causing the lubricating oil to break through the second diaphragm 105 under pressure and enter the annular cylinder 102. After entering the annular cylinder 102, the lubricating oil is discharged through multiple holes and then sprayed onto the lead screw 5 and flows naturally to other parts of the lead screw, thereby completing the lubrication treatment of the lead screw. This reduces the situation where the lead screw 5 is in close contact with other parts when adding oil, resulting in some parts of the lead screw 5 not being in contact with the lubricating oil, which affects the lubrication effect. This improves the convenience and efficiency of lubricating the lead screw 5.

[0051] Figure 3-6The second diaphragm 105 shown has an auxiliary groove 112 on the side near the annular cylinder 102. The auxiliary groove 112 is cross-shaped. By setting the auxiliary groove 112, the strength of the second diaphragm 105 can be reduced, making it easier for the lubricating oil inside the hollow ring 101 to break through the second diaphragm 105 under stress. A steel ball 110 is provided inside the hole of the annular cylinder 102. The steel ball 110 rolls inside the hole, and its diameter is slightly smaller than the inner diameter of the hole. The steel ball 110 is in contact with the surface of the lead screw 5. By setting the steel ball 110, when… During the rotation of the lead screw, the steel balls 110 can be driven to roll inside the hole of the annular cylinder 102, so that the steel balls 110 come into contact with the lubricating oil inside the annular cylinder 102 while rolling, and apply it to the lead screw, so that the lead screw can be continuously lubricated and the uniformity of lubrication of the lead screw can be increased. Multiple anti-slip strips 108 are fixed on the insertion rod 107. The multiple anti-slip strips 108 are arranged at equal distances. By setting the anti-slip strips 108, the friction and resistance between the hand and the surface of the insertion rod 107 can be increased, reducing the possibility of hand slippage when manually rotating the insertion rod 107.

[0052] Figure 3-6 A magnetic ring 109 is fixed to the side of the hollow ring 101 near the insertion hole. The magnetic ring 109 is fixed to the insertion rod 107 by adsorption. By setting the magnetic ring 109, when the insertion rod 107 moves to the position of being fully inserted into the hollow ring 101, the insertion rod 107 is attached to the magnetic ring 109 and is adsorbed and fixed by the magnetic ring 109. After the insertion rod 107 completes the operation, it stays directly inside the hollow ring 101 for quick storage, improving the convenience of operation. A positioning rod 111 is fixed to the inner wall of the hollow ring 101. The positioning rod 111 is placed inside the hole of the piston plate 103 to limit the piston plate 103. The piston plate 103 slides along the positioning rod 111 as a track. By setting the positioning rod 111, the positioning rod 111 can be placed inside the hole of the piston plate 103 to limit it, reducing the possibility of the piston plate 103 tilting when pushed by the insertion rod 107, which could cause jamming during its sliding.

[0053] Working principle: First, after measuring the installation distance, use the hexagonal set screws to fasten the two incomplete semi-rings of the limiting device 9 to the lead screw 5 through the threaded holes at both ends; use screws 8 to fix the device to the front end face of the closing section through the four threaded holes below the bracket 4; use the crane hook to hook the lifting ring 1 and lift the entire component; when the assembly reaches directly above the closing section, the crane slowly descends to the part where the split bearing is about to be engaged; rotate the handle 2, which in turn drives the lead screw 5 to rotate, the screw sleeve 3 is fixed on the bracket 4, and the pressure sleeve 6 contains the hinge bearing 7. As the lead screw 5 rotates, the entire assembly component can slowly fall until the entire component is assembled in place, and the split bearing can be assembled in place; at the same time, the size and structure of the bracket 4 can be adjusted to meet different closing assembly components.

[0054] When lubrication of the lead screw 5 is required, manually unscrew the insert rod 107 from the screw hole 106. Then, move the insert rod 107 into the insertion hole on the hollow ring 101, so that the insert rod 107 breaks the first diaphragm 104 and contacts the piston plate 103. At this time, manually press the insert rod 107, so that the insert rod 107 pushes the piston plate 103 to slide inside the hollow ring 101. During the sliding process, the piston plate 103 squeezes the lubricating oil inside the hollow ring 101, so that the lubricating oil is under pressure and breaks the second diaphragm 1. 05 and enter the interior of the annular cylinder 102, so that the lubricating oil enters the annular cylinder 102 and is discharged through multiple holes, then sprayed onto the lead screw 5 and flows naturally to other parts of the lead screw. At the same time, when the lead screw rotates, it drives the steel balls 110 to roll inside the holes of the annular cylinder 102, so that the steel balls 110 come into contact with the lubricating oil inside the annular cylinder 102 while rolling, and apply it to the lead screw, so that the lead screw can be continuously lubricated, increasing the uniformity of lubrication of the lead screw, thereby completing the lubrication treatment of the lead screw.

[0055] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A device for closing and slowly releasing that is not visually accessible, characterized in that: include: The bracket (4) is used to support the entire device and can be fixed to the front end face of the closing section by screws (8) through the four threaded holes below. Screw sleeve (3), the screw sleeve (3) is fixed to the bracket (4) by welding, and its inner wall is provided with threads. The inner wall of the screw sleeve (3) is threadedly connected to a lead screw (5), wherein the lead screw (5) can move vertically inside the screw sleeve (3) by rotation; The lifting ring (1) is fixed to the lead screw (5) by a pin; A pressure sleeve (6) is sleeved on the lead screw (5), wherein the pressure sleeve (6) and the lead screw (5) are connected by a retaining ring through a hole to prevent the pressure sleeve (6) from coming off the lead screw (5); Hinge bearing (7), the hinge bearing (7) is placed between the pressure sleeve (6) and the lead screw (5), wherein the hinge bearing (7) is placed inside the pressure sleeve (6) to ensure that the pressure sleeve (6) and the section to be closed remain stationary when the lead screw (5) rotates; A limiting device (9) is provided on the lead screw to limit the movement distance of the lead screw (5) during its descent.

2. The device for closing and releasing that is not visually accessible according to claim 1, characterized in that: The limiting device (9) consists of two incomplete semi-rings, the inner hole of which is threaded. The limiting device (9) is fastened to the lead screw (5) by using internal hexagon set screws through the threaded holes at both ends.

3. The device for closing and releasing that is not visually accessible according to claim 1, characterized in that: Also includes: Lubrication device (10), the lubrication device (10) includes: a hollow ring (101), the hollow ring (101) is welded and fixed to the screw sleeve (3), wherein the hollow ring (101) is provided with a discharge hole and an insertion hole, wherein the inner wall of the insertion hole is fixedly connected with a first film (104), the inner wall of the discharge hole is fixedly connected with a second film (105), wherein the hollow ring (101) is filled with lubricating oil, and a screw rod (106) is fixedly connected to the hollow ring (101); Insert rod (107), wherein the insert rod (107) is provided with a partial thread, wherein the insert rod (107) is threaded to the inner wall of the screw hole rod (106) through the partial thread, wherein the size and shape of the insert rod (107) are adapted to the size and shape of the inner wall of the insertion hole on the hollow ring (101), wherein the insert rod (107) is made of magnetically attractive metal material; A piston plate (103) is placed inside a hollow ring (101) and slides up and down, wherein the overall size and shape of the piston plate (103) are adapted to the size and shape of the inner wall of the hollow ring (101).

4. The device for closing and releasing that is not visually accessible according to claim 3, characterized in that: An annular cylinder (102) is fixed to the inner side of a hollow ring (101), wherein the annular cylinder (102) completely covers the discharge hole and the second film (105) on the hollow ring (101), wherein the annular cylinder (102) has multiple holes, wherein the cross-section of the inner wall of the holes is spherical.

5. The device for closing and releasing that is not visually accessible according to claim 4, characterized in that: The second film (105) has an auxiliary groove (112) on the side near the annular cylinder (102), wherein the auxiliary groove (112) is cross-shaped.

6. The device for closing and releasing that is not visually accessible according to claim 5, characterized in that: The annular cylinder (102) has steel balls (110) inside its holes, and the steel balls (110) are placed inside the holes and roll.

7. The device for closing and releasing that is not visually accessible according to claim 6, characterized in that: The diameter of the steel ball (110) is smaller than the inner diameter of the hole, and the steel ball (110) is in contact with the surface of the lead screw (5).

8. The device for closing and releasing that is not visually accessible according to claim 7, characterized in that: Multiple anti-slip strips (108) are fixedly connected to the insertion rod (107), and the multiple anti-slip strips (108) are arranged at equal distances.

9. The device for closing and releasing that is not visually accessible according to claim 8, characterized in that: A magnetic ring (109) is fixed to the side of the hollow ring (101) near the insertion hole, wherein the magnetic ring (109) is fixed by an adsorption rod (107).

10. The device for closing and releasing that is not visually accessible according to claim 9, characterized in that: The hollow ring (101) has a positioning rod (111) fixed to its inner wall. The positioning rod (111) is placed inside the hole of the piston plate (103) to limit the piston plate (103). The piston plate (103) slides along the positioning rod (111) as a track.

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