Manual rotary lifting device with speed reduction assisting function

Abstract

A manual rotary lifting device with a speed reduction assisting function comprises a lifting unit and a davit rotary arm unit. According to the lifting unit, the upper portion of a lifting lead screw is connected with a built-in nut copper sleeve in a power-assisted speed-reducing mechanism, the middle penetrates through a valve connecting sleeve, and the lower portion is connected with a lifting connecting plate. One end of a horizontal output shaft in the power-assisted speed reducing mechanism is connected with a hand wheel, the other end of the horizontal output shaft is provided with a bevel pinion, the bevel pinion is meshed with a bevel gear wheel, the bevel gear wheel drives a hollow shaft sleeve which is vertically arranged to rotate, the hollow shaft sleeve is meshed with straight teeth of a nut copper sleeve, and the nut copper sleeve is in trapezoidal thread fit with a lifting lead screw; the lower end of a stand column is connected with a stand column supporting plate, and the upper portion of the stand column is connected with the lower end of a vertical shaft unit. A limiting device is installed on the side face of the vertical shaft unit and used for limiting the rotating angle of the vertical shaft unit. By means of the structure, the manual rotary lifting device with the speed reduction assisting function is convenient to use and wide in applicability.

Description

Technical Field

[0001] The utility model belongs to supporting equipment for a vertical pressure vessel, in particular to a manual rotary lifting device with deceleration power assistance. Background Art

[0002] In the chemical industry, the top flange covers of large, high-pressure vertical pressure vessels are often weighed in tons. Opening and removing these covers during maintenance is difficult without lifting equipment.

[0003] Typically, small-sized pressure vessels can be fitted with suspenders manufactured to chemical equipment standards. However, as the weight of the cover plate increases, the suspender structure becomes unusable. This requirement has been addressed by adding electric or hydraulic mechanisms. However, this approach increases manufacturing costs. Another major factor is that some petrochemical sites lack power supply or safety requirements prohibit the use of electrical and hydraulic systems. Therefore, consideration was given to designing a mechanical structure that achieves torque reduction and rotation to complete the flange cover opening process. Summary of the Invention

[0004] The technical problem to be solved by the utility model is how to realize the reduction and steering of torque without adopting electric or hydraulic mechanisms.

[0005] The utility model is realized by the following technical solutions: a manual rotary lifting device with deceleration power assistance, comprising a lifting unit and a davit arm unit;

[0006] Lifting unit: The upper portion of the lifting screw is connected to the copper nut built into the power-assisted reduction mechanism. It passes through a valve connecting sleeve welded to the swing arm crossbeam and is connected to the lifting connecting plate at the lower portion. A guide key is provided between the lifting screw and the valve connecting sleeve, ensuring that the lifting screw and valve connecting sleeve are perpendicular to the power-assisted reduction mechanism. One end of the horizontal output shaft in the power-assisted reduction mechanism is connected to the handwheel, and the other end is equipped with a small bevel gear, which meshes with a large bevel gear. The large bevel gear drives the rotation of a vertically mounted hollow sleeve. The hollow sleeve meshes with the straight teeth of the copper nut, which in turn mates with the trapezoidal threads of the lifting screw. The lower portion of the lifting screw is connected to the lifting connecting plate welded to the flange cover via a pin. Two bevel gears are mounted above and below the hollow sleeve of the power-assisted reduction mechanism. These paired gears reduce torque and facilitate steering. The lower portion of the power-assisted reduction mechanism is connected to the swing arm crossbeam via the outer casing.

[0007] The gantry arm unit: The lower end of the gantry arm is connected to the gantry support plate, and the upper end is connected to the lower end of the vertical axis unit. The upper end of the vertical axis unit is connected to the gantry arm crossbeam. A limit device is installed on the side of the vertical axis unit to limit the rotation angle of the vertical axis unit. A retractable force rod is installed at the end of the gantry arm crossbeam, which can be extended or retracted laterally.

[0008] The vertical shaft unit includes a swivel sleeve assembly, which consists of a swivel sleeve plate and a swivel sleeve. The swivel sleeve plate is connected to the crossbeam flange below the swivel arm crossbeam, and a lubricating oil nozzle is provided on the side of the swivel sleeve; the fixed shaft assembly includes a pin and a fixed shaft plate, which is connected to the column flange above the column, the pin is inserted into the swivel sleeve, and a protective pressure cover is installed on the upper part of the pin; two sets of tapered roller bearings are installed between the swivel sleeve and the pin, and the tapered roller bearings are transitionally matched with the pin, and the inner ring of the tapered roller bearing is tightened by a locking nut.

[0009] The limiting device consists of a limiting slide, a limiting pin, a limiting pin ear, and a limiting block; the limiting pin ear is welded to the flange, and the limiting slide and the limiting block are welded to the side of the column flange as a fixed plate. The limiting pin passes through the circular hole in the middle of the limiting pin ear, and the bottom ball head is arranged in the limiting slide.

[0010] The beneficial effects of the present invention are as follows: the present invention has a wide range of applications and can easily lift and push heavy objects manually with less force. At the same time, the structure is stable, workers can operate it easily, and the cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the structure of the utility model;

[0012] Figure 2 It is a schematic diagram of the structure of the power-assisted deceleration mechanism;

[0013] Figure 3a It is a structural diagram of the vertical shaft unit;

[0014] Figure 3b 1. It is a schematic diagram of the fixed shaft assembly structure;

[0015] Figure 3c 1. It is a schematic diagram of the structure of the rotary sleeve assembly;

[0016] Figure 4a 1. It is a schematic diagram of the structure of the limit device;

[0017] Figure 4b yes Figure 4a Top view of . DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0019] like Figure 1A manual rotary lifting device with deceleration power assistance is shown, comprising a lifting unit and a davit arm unit.

[0020] Lifting unit: The upper part of the lifting screw 2 is connected to the nut copper sleeve 5 built into the power-assisted deceleration mechanism 6, and the middle passes through the valve connecting sleeve 4 welded to the swing arm crossbeam 9, and the lower part is connected to the lifting connecting plate 1; a guide key 3 is provided between the lifting screw 2 and the valve connecting sleeve 4, so that the lifting screw 2 and the valve connecting sleeve 4 are perpendicular to the power-assisted deceleration mechanism 6.

[0021] like Figure 2 As shown, one end of the horizontal output shaft 6-6 in the power-assisted reduction mechanism 6 is connected to the handwheel 7, and the other end is equipped with a small bevel gear 6-5. The small bevel gear 6-5 meshes with the large bevel gear 6-3, which in turn drives the vertically arranged hollow sleeve 6-2 to rotate. The hollow sleeve 6-2 meshes with the straight teeth of the nut copper sleeve 5, which in turn mates with the stepped threads of the lifting screw 2. The lower portion of the lifting screw 2 is connected to the lifting connecting plate 1 welded to the flange cover via a pin. Two bevel gears 6-4 are mounted above and below the outer side of the hollow sleeve 6-2 of the power-assisted reduction mechanism 6. These paired gears reduce torque and facilitate steering operation. The lower portion of the power-assisted reduction mechanism 6 is connected to the swing arm crossbeam 9 via the housing 6-1. Internally, the power-assisted deceleration valve 6 houses a bevel gear reduction mechanism. Its lower housing 6-1 is flange-connected to the valve connection sleeve 4. A built-in copper nut 5 pairs with the lifting screw 2 to achieve the rotary lifting function. Furthermore, a pair of bevel gears, selected based on the design requirements, achieves a 4.5 speed ratio and vertical steering, significantly reducing the lifting torque inversely proportional to the power-assisted deceleration valve's speed ratio. A 520mm diameter rotary drive handwheel 7 is mounted on the power-assisted deceleration valve's output shaft 6-6, reducing the driving torque to below the design requirement of 50N. Actual testing shows that the driving torque of the entire power-assisted deceleration valve is only 30N.

[0022] Driving Principle: Turning handwheel 7 with both hands rotates the horizontal output shaft 6-6 in the power-assisted reduction mechanism 6. The small bevel gear 6-5 on the output shaft meshes with the large bevel gear 6-3, causing the large bevel gear 6-3 to begin rotating horizontally. This in turn rotates the hollow sleeve 6-2, which then meshes with the nut copper sleeve 5 through spur teeth, further rotating the nut copper sleeve 5. Finally, the nut copper sleeve 5 and the lifting screw 2 engage through a trapezoidal thread, converting axial rotation into a vertical lifting motion for the lifting screw.

[0023] The sling arm unit: The lower end of the column 12 is connected to the column support plate 13, and the upper part is connected to the lower end of the vertical shaft unit 10. The upper end of the vertical shaft unit 10 is connected to the sling arm crossbeam 9. The vertical shaft unit 10 is installed with a limit device 11 on the side to limit the rotation angle of the vertical shaft unit 10. The end of the sling arm crossbeam 9 is installed with a retractable force rod 8, which can be extended or retracted laterally.

[0024] The column 12 is made of seamless steel pipe and also needs to calculate the axial compressive stress, radial cross-section shear stress, and cross-section bending normal stress. After adjusting the column diameter and wall thickness to meet the requirements, the column deflection must be verified to ensure safe use. The column 12 is required to remain perpendicular to the swing arm beam 9. When the column 12 is fixed, the swing arm beam 9 is required to rotate clockwise or counterclockwise at will. To ensure that it can be pushed by a single person, its rotational thrust shall not exceed 100N (about 10kgf). Therefore, a connecting vertical shaft unit 10 is set between the column 12 and the swing arm beam 9. The vertical shaft unit 10 is equipped with a tapered roller bearing 10-5 that can withstand both radial and axial forces. The fixed axis plate 10-1-1 and the rotating sleeve plate 10-3-1 of the vertical shaft unit 10 are respectively connected to the column 12 and the swing arm beam 9 by bolts.

[0025] The swivel arm crossbeam 9 and the swivel sleeve connecting crossbeam flanges 14 and valve connecting sleeve 4 distributed on both sides, the swivel arm crossbeam 9 bears the gravity of the flange cover load, and the stress of the dangerous section needs to be confirmed through force analysis. The H-shaped steel of appropriate specifications must be selected, and the bending section modulus must meet the requirements. At the same time, deflection verification is required. The swivel sleeve connecting crossbeam flange 14 is fastened to the swivel sleeve plate 10-3-1 of the vertical shaft by bolts, thus forming a freely rotatable cantilever supported by a column. The swivel arm crossbeam 9 at the other end is welded to the side wall of the valve connecting sleeve 4. During welding, it is necessary to ensure that the flange surface of the valve connecting sleeve 4 is horizontal. The valve connecting sleeve 4 flange is fastened to the flange of the power-assisted deceleration mechanism 6 by bolts, that is, the swivel arm and the lifting connection are a set of whole.

[0026] like Figures 3a-3c As shown, the vertical shaft unit 10 includes a rotating sleeve assembly 10-3, which is composed of a rotating sleeve plate 10-3-1 and a rotating sleeve 10-3-2. The rotating sleeve plate 10-3-1 is connected to the beam flange 14 below the rotating arm beam 9, and a lubricating oil nozzle 10-4 is provided on the side of the rotating sleeve 10-3-2; the fixed shaft assembly 10-1 includes a pin 10-1-2 and a fixed shaft plate 10-1-1, and the fixed shaft plate 10-1-1 is connected to the column 1 2 is connected to the column flange 15 above, and the pin 10-1-2 is inserted into the rotating sleeve 10-3-2. A protective gland 10-7 is installed on the top of the pin 10-1-2. Two sets of tapered roller bearings 10-5 are installed between the rotating sleeve 10-3-2 and the pin 10-1-2. The tapered roller bearings 10-5 are transitionally fitted with the pin 10-1-2, and the inner rings of the tapered roller bearings 10-5 are compressed by the lock nut 10-6. A sealing ring 10-2 is installed below the fixed shaft assembly 10-1 and the rotating sleeve assembly 10-3.

[0027] The vertical shaft unit 10 is a key component for achieving easy steering of the swing arm. The fixed shaft assembly 10-1 and the rotating sleeve assembly 10-3 described in the figure are respectively connected to the fixed support column 12 and the cantilever beam 9 through flanges. The model of the tapered roller bearing 10-5 is 33024. The basic rated dynamic load of a single bearing reaches 298000N. On the basis of meeting the strength requirements, through the calculation of the friction torque and after cooperating with the force rod, the actual test shows that the side thrust required to push the flange to move is 75N.

[0028] like Figure 4a-4b As shown. The limit device 11 consists of a limit slide 11-1, a limit pin 11-3, a limit pin hanging ear 11-4, and a limit block 11-2; the limit pin hanging ear 11-4 is welded to the flange 14, and the limit slide 11-1 and the limit block 11-2 are welded to the side of the column flange 15 as a fixed plate. The limit pin 11-3 passes through the circular hole in the middle of the limit pin hanging ear 11-4, and the bottom ball head is set in the limit slide 11-1. When the cantilever rotates, the limit pin 11-3 rotates accordingly, and the bottom ball head slides along the limit slide 11-1. When it reaches the set angle position, the limit pin 11-3 will sink and fall into the limit hole on the limit slide 11-1 to lock. If you need to return, just lift the limit pin 11-3 to unlock it, and confirm that the return is correct through the restriction of the limit block 11-2 during the return operation.

[0029] The limit mechanism 11 is a device designed to prevent on-site interference and secure the door in the open position after turning, as required by the customer. As shown in the figure, the limit mechanism 11 consists of a limit slide 11-1, a limit block 11-2, a limit pin 11-3, and a limit pin hook 11-4. When fully opened, the limit slide hole and the pin are locked together. When closed, the limit block blocks the limit pin, completing the positioning.

[0030] The working steps are as follows:

[0031] 1. Preparation:

[0032] Flange lifting conditions:

[0033] 1. Confirm that the pressure relief of the pressure vessel to be opened is complete;

[0034] 2. All flange bolts that need to be opened are removed;

[0035] 3. The lifting screw has a direction. Please confirm the mark of the valve rotation direction before use.

[0036] 2. Flange lifting and steering operation:

[0037] 1. The operator steps onto the operating platform and faces the operating handwheel;

[0038] 2. Turn the handwheel in the direction indicated;

[0039] 3. Visually confirm that the flange cover rises 50-100mm and is ready to be removed, then stop turning the handwheel.

[0040] 4. Pull out the force rod placed on one side of the beam, hold it with both hands and push the cantilever in a circular direction. The cantilever and the flange cover rotate and move away.

[0041] 5. When the flange cover is removed and pushed to the required opening angle, the limit pin falls into the limit slide hole. At this time, the position of the flange cover is fixed and cannot be moved anymore;

[0042] 6. Before closing, pull out the limit pin to disengage the limit slide hole. After releasing the limit, push the cantilever and the cantilever will rotate back to its original position with the flange cover.

[0043] 7. When the limit pin is stopped by the limit block, it means that you can proceed to the next step. Turn the handwheel to drop the flange cover and confirm that the bolt holes of the flange are aligned. At this point, the whole process is completed.

Claims

1. A manual rotary lifting device with deceleration power assistance, characterized in that: It includes a lifting unit and a davit arm unit; Lifting unit: The upper part of the lifting screw (2) is connected to the nut copper sleeve (5) built into the power-assisted reduction mechanism (6), the middle part passes through the valve connecting sleeve (4) welded to the rotating arm crossbeam (9), and the lower part is connected to the lifting connecting plate (1); one end of the horizontal output shaft (6-6) in the power-assisted reduction mechanism (6) is connected to the hand wheel (7), and the other end is provided with a small bevel gear (6-5), the small bevel gear (6-5) is engaged with the large bevel gear (6-3), and the large bevel gear (6-3) drives the vertically arranged hollow shaft sleeve (6-2) to rotate, the hollow shaft sleeve (6-2) is engaged with the nut copper sleeve (5) with straight teeth, and the nut copper sleeve (5) is matched with the trapezoidal thread of the lifting screw (2); Hanging column arm unit: the lower end of the column (12) is connected to the column support plate (13), the upper part is connected to the lower end of the vertical shaft unit (10), and the upper end of the vertical shaft unit (10) is connected to the arm crossbeam (9); a limiting device (11) is installed on the side of the vertical shaft unit (10) for limiting the rotation angle of the vertical shaft unit (10); The vertical shaft unit (10) includes a rotating sleeve assembly (10-3), which is composed of a rotating sleeve plate (10-3-1) and a rotating sleeve (10-3-2). The rotating sleeve plate (10-3-1) is connected to the beam flange (14) below the rotating arm beam (9), and a lubricating oil nozzle (10-4) is provided on the side of the rotating sleeve (10-3-2); the fixed shaft assembly (10-1) includes a pin (10-1-2) and a fixed shaft plate (10-1-1), and the fixed shaft plate (10-1-1) is connected to the column. The column flange (15) above (12) is connected, the pin (10-1-2) is inserted into the rotating sleeve (10-3-2), and a protective pressure cover (10-7) is installed on the upper part of the pin (10-1-2); two sets of tapered roller bearings (10-5) are installed between the rotating sleeve (10-3-2) and the pin (10-1-2), and the tapered roller bearings (10-5) and the pin (10-1-2) are transitionally matched, and the inner ring of the tapered roller bearing (10-5) is pressed by the locking nut (10-6).

2. A manual rotary lifting device with deceleration power assistance according to claim 1, characterized in that: The lower portion of the lifting screw (2) is connected to the lifting connecting plate (1) welded on the flange cover via a pin shaft; a guide key (3) is provided between the lifting screw (2) and the valve connecting sleeve (4), so that the lifting screw (2) and the valve connecting sleeve (4) are perpendicular to the power-assisted deceleration mechanism (6).

3. The manual rotary lifting device with deceleration power assistance according to claim 1, characterized in that: The limiting device (11) is composed of a limiting slide (11-1), a limiting pin (11-3), a limiting pin hanging ear (11-4), and a limiting block (11-2); the limiting pin hanging ear (11-4) is welded to the flange (14), and the limiting slide (11-1) and the limiting block (11-2) are welded to the side of the column flange (15) as a fixing plate, and the limiting pin (11-3) passes through the circular hole in the middle of the limiting pin hanging ear (11-4), and the bottom ball head falls on the limiting slide (11-1).

4. The manual rotary lifting device with deceleration power assistance according to claim 1, characterized in that: A retractable force-adding rod (8) is installed at the end of the rotating arm crossbeam (9), and the force-adding rod (8) can be extended or retracted laterally.

5. The manual rotary lifting device with deceleration power assistance according to claim 1, characterized in that: Two bevel gears (6-4) are mounted on the upper and lower outer sides of the hollow shaft sleeve (6-2) of the power-assisted speed reduction mechanism (6), and are paired to reduce torque and facilitate steering operation. The lower portion of the power-assisted speed reduction mechanism (6) is connected to the rotating arm crossbeam (9) via the housing (6-1).

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