Adjustable tool suitable for storage and transfer of large-diameter ventilation pipe section

Abstract

The invention belongs to tools, and particularly relates to an adjustable tool suitable for storage and transfer of large-diameter ventilation pipe sections. An adjustable tool suitable for storage and transfer of a large-diameter ventilation pipe section comprises an active telescopic frame, a passive telescopic frame, a ratchet and pawl mechanism and a main frame. The active telescopic frame and the passive telescopic frame are vertically arranged on the same horizontal plane, the relative position relation of the active telescopic frame and the passive telescopic frame is fixed through the main frame, and the vertical relation of the active telescopic frame and the passive telescopic frame is always kept. The tool has the remarkable effects that the tool is used for storing and transferring large-diameter ventilation pipe sections, and the ventilation pipe sections have the two major characteristics that the size is large, the pipe wall is thin, and the two ends of part of the ventilation pipe sections cannot be flanged. The supporting rod arm in the tool is applied to the hoisting and transferring process of the ventilation pipe section, the tray piece is designed to be attached to the pipe opening, the pipe section is supported in the hoisting and transferring process, and use is convenient.

Description

Technical Field

[0001] The invention belongs to tooling, and in particular relates to an adjustable tooling suitable for storing and transporting large-diameter ventilation pipe sections. Background Art

[0002] Ventilation ducts are metal or composite ducts for ventilation and air conditioning engineering in industrial and civil buildings. They are an infrastructure for air circulation and reducing the concentration of harmful gases. Ventilation ducts are composed of ventilation pipe sections, ventilation valves and fans of different specifications and models according to actual needs. In the system installation project of the R project participated in by China National Nuclear Corporation 23, the installation of ventilation ducts is an important construction activity. According to the upstream design requirements, the ventilation pipe sections of some ventilation systems are circular, with large diameters, low structural strength, poor material flexibility and easy deformation, which brings considerable difficulties to the construction work. The ventilation pipe sections are generally prefabricated in the prefabrication workshop first, and then transported to the construction site by hoisting for pipe section group connection. Due to the large diameter and low structural strength, the ventilation pipe sections are easily deformed during storage and hoisting and transportation after prefabrication, resulting in secondary rework, extended construction period and increased construction costs. In the previous installation and construction process, the ventilation pipe sections needed to be returned to the prefabrication workshop for pipe mouth correction due to deformation, and then transported to the construction site for group welding, resulting in a waste of project construction cycle and increased cost investment. Summary of the invention

[0003] In view of the defects of the prior art, the present invention provides an adjustable tool suitable for storing and transporting large-diameter ventilation pipe sections.

[0004] The present invention is implemented as follows: an adjustable tooling suitable for storage and transportation of large diameter ventilation pipe sections, which includes four major parts: an active telescopic frame, a passive telescopic frame, a ratchet pawl mechanism, and a main frame; the active telescopic frame and the passive telescopic frame are vertically arranged on the same horizontal plane, and the relative position relationship between the two is fixed by the main frame to always maintain the vertical relationship between the two.

[0005] As described above, an adjustable tooling suitable for storage and transportation of large-diameter ventilation duct sections is described, wherein the structures of the active telescopic frame and the passive telescopic frame mainly include: a gear rack mechanism, a telescopic rod structure, and an arc-shaped top plate structure, wherein the telescopic rod structure is a strut arm and a supporting rod arm, and the telescopic frame is generally distributed in an "H" shape, and the middle part is a gear rack mechanism, and the rack is connected to the outer rod of the strut arm by welding. The strut arm extends and contracts with the rack due to the meshing movement of the gear and the rack, and the end of the inner rod of the strut arm is connected to the upper and lower supporting rod arms, and the outer rod of the supporting rod arm is connected to the inner rod of the strut arm by a connecting piece, and the top end of the inner rod of the strut arm is connected to the arc-shaped top plate structure, which increases the contact area between the tooling and the inner wall of the ventilation duct section and protects the inner wall from being scratched. The ratchet in the ratchet pawl mechanism rotates coaxially with the gear, and the gear rotates by the rotation of the ratchet.

[0006] As described above, an adjustable tooling suitable for the storage and transportation of large diameter ventilation pipe sections, wherein the gear rack mechanism adopts a combination of "single gear and double racks", consisting of a spur gear, two spur racks, a bearing, and a rotating shaft. One gear is meshed with the two spur racks at the same time, and the two racks always remain parallel and are arranged in a "Z" shape with the spur gear as a whole. When the gear rotates, the gear and the rack mesh, thereby causing the two spur racks to extend and contract at the same time.

[0007] The adjustable tooling suitable for the storage and transportation of large diameter ventilation pipe sections as described above, wherein the ratchet and pawl mechanism "rotates coaxially" with the gear, and is composed of a ratchet, a pawl, a cam, a rocker, a ratchet mechanism box and a spring, the ratchet being arranged at the front of the ratchet mechanism box, a cam being distributed in the middle of the rear, and two pawls being distributed on both sides, and when not in use, the two pawls hold the ratchet teeth under the action of the spring, so that both clockwise and counterclockwise rotation of the ratchet are blocked, and when in use, the cam is turned to the left through the cam knob, and the left pawl is forced to rotate to the left, at which time the left pawl is out of contact with the ratchet teeth, and the right pawl still holds the ratchet teeth, and the ratchet can rotate counterclockwise, and similarly, the ratchet can be rotated clockwise by turning the cam to the right, and after the ratchet rotates to the specified position, the cam is rotated to the middle position, at which time the left and right pawls rebound again under the action of the spring to hold the ratchet, and the ratchet cannot rotate.

[0008] As described above, an adjustable tooling suitable for storage and transportation of large diameter ventilation pipe sections, wherein the support arm is designed as a telescopic structure, using the working principle of a large tube sleeved with a small tube, so that the small tube can freely extend and retract under the restriction of the large tube, the support arm is composed of an outer rod, an inner rod, and a limit bolt, the inner rod and the outer rod are made of square tubes or rectangular tubes, the inner diameter of the outer rod is larger than the outer diameter of the inner rod, so that the outer rod is sleeved inside the inner rod, the inner wall of the outer rod serves as a guide for the inner rod, and limit holes are respectively provided on the outer rod and the inner rod. Before use, according to the actual telescopic range of the telescopic frame, the inner rod and the outer rod are extended to a relative length by the limit bolts, and are fixed with bolts to keep the outer rod and the inner rod in a fixed state when in use, a rack is welded at the root of the outer rod, and the support arm moves synchronously with the rack during operation.

[0009] As described above, an adjustable tooling suitable for the storage and transportation of large-diameter ventilation pipe sections, wherein the support arm has the same structural form as the strut arm, the inner rod and the outer rod are made of square tubes or rectangular tubes, the inner wall of the outer rod serves as a guide for the inner rod, the root of the outer rod of the support arm is connected to the end of the inner rod of the strut arm through a square pipe sleeve, the end of the inner rod of the support arm is connected and fixed to a pallet structure, and is fixed with bolts, a "fishtail" structure is provided at the tail of the outer rod of the support arm, so that the support arm can achieve a small angle deflection in the vertical direction, and the support arm is divided into an upper support arm and a lower support arm, the main function of the upper support arm is to hold the edge of the pipe section and limit the movement of the pipe section; the function of the lower support arm is to lift the pipe section, bear the weight of the pipe section, and prevent the pipe section from falling off during the transportation of the pipe section.

[0010] As described above, an adjustable tooling suitable for storage and transportation of large diameter ventilation pipe sections, wherein the arc-shaped top plate is an external component of the support arm, arranged on the top of the inner rod of the support arm, welded by a piece of arc-shaped steel plate and a section of square steel pipe, connected to the end of the inner rod of the transverse support arm by bolts, and the outer side of the arc-shaped steel plate is designed to be made of rubber material.

[0011] As described above, an adjustable tooling suitable for storage and transportation of large diameter ventilation pipe sections, wherein the pallet component is an external component of the inner rod of the support arm, is spliced ​​by plates of different sizes and shapes, and is overall designed as a "J"-shaped structure, with two notched connecting holes designed on the connecting plate.

[0012] As described above, an adjustable tooling suitable for storage and transportation of large diameter ventilation pipe sections, wherein the main frame is formed by splicing and welding 4 long rectangular steel pipes and 16 end rectangular steel pipes, and the main frame is spliced ​​and completed according to the spatial arrangement of the active telescopic frame and the passive telescopic frame.

[0013] The significant effect of the present invention is that the tooling is aimed at the storage and transportation of large-diameter ventilation pipe sections. The two major characteristics of such ventilation pipe sections are large size and thin pipe wall, and some ventilation pipe sections have no flanges at both ends. The support arm in the tooling is used in the process of hoisting and transporting the ventilation pipe section. The tray part fits the pipe mouth design, and the pipe section is supported during the hoisting and transporting process, which is convenient for use. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Adjustable large diameter ventilation pipe section storage and transfer tool

[0015] Figure 2 Structural diagram of the gear rack mechanism

[0016] Figure 3 Schematic diagram of the ratchet pawl mechanism

[0017] Figure 4 Schematic diagram of the combination of the support arm and the supporting arm

[0018] Figure 5 Schematic diagram of active telescopic frame structure

[0019] Figure 6 Effect drawing of ventilation pipe section storage and transfer tooling

[0020] Figure 7 Effect drawing of ventilation pipe section storage and transfer tooling

[0021] In the figure: 1. front active telescopic frame, 2. left passive telescopic frame, 3. ratchet and pawl mechanism, 4. rear active telescopic frame, 5. right passive telescopic frame, 6. lower support arm outer rod, 7. lower spur rack, 8. spur gear, 9. upper support arm outer rod, 10. upper spur rack, 11. mechanism box, 12. left pawl, 13. left spring, 14. ratchet, 15. rotating shaft, 16. rocker, 17. right spring, 18. right pawl, 19. cam, 20. right ratchet positioning screw, 21. left ratchet positioning screw, 22. mechanism box cover fastening screw, 23. "J" type tray part, 24. distance adjustment bolt, 25. support arm inner rod, 26. support arm outer rod, 27. "fishtail" structure, 28. arc top plate, 29. square connecting sleeve, 30. connecting bolt, 31. support arm inner rod. DETAILED DESCRIPTION

[0022] The main structure of this adjustable large-diameter ventilation pipe section storage and transfer tooling includes four parts: an active telescopic frame, a passive telescopic frame, a ratchet pawl mechanism, and a main frame. The active telescopic frame and the passive telescopic frame are arranged vertically on the same horizontal plane, and the relative position relationship between the two is fixed by the main frame to always maintain the vertical relationship between the two. The main components of the active and passive telescopic frames are: a gear rack mechanism, a telescopic rod structure, and an arc-shaped top plate structure, wherein the telescopic rod structure is a support arm and a supporting rod arm. The telescopic frame is distributed in an "H" shape as a whole, and the middle part is a gear rack mechanism. The rack is connected to the outer rod of the support arm by welding. The support arm moves with the rack due to the meshing movement of the gear and the rack. The end of the inner rod of the support arm is connected to the upper and lower supporting rod arms, and the outer rod of the supporting rod arm is connected to the inner rod of the support arm through a specific connector. The top of the inner rod of the support arm is connected to the arc-shaped top plate structure, the purpose of which is to increase the contact area between the tooling and the inner wall of the ventilation pipe section and protect the inner wall from being scratched. The ratchet in the ratchet and pawl mechanism rotates coaxially with the gear, and the gear rotates through the rotation of the ratchet. Due to the structural characteristics of the ratchet and pawl mechanism, the gear cannot rotate without the action of external force, so the function of the ratchet and pawl mechanism is to prevent the gear from rotating.

[0023] The gear rack mechanism adopts a combination of "single gear and double racks". It consists of a spur gear, two spur racks, a bearing, and a rotating shaft. One gear meshes with two spur racks at the same time, and the two racks always remain parallel and are arranged in a "Z" shape with the spur gear as a whole. When the gear rotates, the gear and the rack mesh, so that the two spur racks extend and contract at the same time. According to the design, the gear rotates coaxially with the ratchet, and the gear rotates with the rotation of the ratchet. The rack is welded to the outer rod of the support arm, and the support arm moves with the movement of the rack.

[0024] The ratchet pawl mechanism "rotates coaxially" with the gear and is composed of a ratchet, a pawl, a cam, a rocker, a ratchet mechanism box and a spring. The ratchet is arranged at the front of the ratchet mechanism box, and a cam is distributed in the middle of the rear, and two pawls are distributed on both sides. When not in use, the two pawls hold the ratchet teeth under the action of the spring, so that the clockwise and counterclockwise rotation of the ratchet is blocked. When in use, the cam is turned to the left through the cam knob, and the left pawl is forced to rotate to the left. At this time, the left pawl is out of contact with the ratchet teeth, and the right pawl still holds the ratchet teeth, and the ratchet can rotate counterclockwise. Similarly, turning the cam to the right can make the ratchet rotate clockwise. After the ratchet rotates to the specified position, the cam is rotated to the middle position. At this time, the pawls on both sides rebound and hold the ratchet again under the action of the spring, and the ratchet cannot rotate. Through the working principle of the ratchet pawl, the rotation of the ratchet is effectively restricted, thereby preventing the telescopic frame from accidentally retracting, which plays a protective role.

[0025] The brace arm is designed as a telescopic structure, which uses the working principle of a large tube covering a small tube, so that the small tube can freely expand and contract under the restriction of the large tube. The brace arm is composed of an outer rod, an inner rod, and a limit bolt. The inner rod and the outer rod are made of square tubes or rectangular tubes. The inner diameter of the outer rod is larger than the outer diameter of the inner rod, so that the outer rod is covered with the inner rod, and the inner wall of the outer rod serves as a guide for the inner rod. Limit holes are respectively provided on the outer rod and the inner rod. Before use, according to the actual telescopic range of the telescopic frame, the inner rod and the outer rod are extended to a relative length through the limit bolts, and are fixed with bolts to keep the outer rod and the inner rod in a fixed state when in use. A rack is welded at the root of the outer rod, and the brace arm moves synchronously with the rack during operation to realize the telescopic function of the brace arm.

[0026] The support arm has the same structural form as the brace arm. The inner rod and the outer rod are made of square tubes or rectangular tubes, and the inner wall of the outer rod serves as a guide for the inner rod. The root of the outer rod of the support arm is connected to the end of the inner rod of the brace arm through a square pipe sleeve, and the end of the inner rod of the support arm is connected and fixed to a pallet structure, which is fixed with bolts. A "fishtail" structure is designed at the tail of the outer rod of the support arm, so that the support arm can achieve a small angle deflection in the vertical direction. The support arm is divided into an upper support arm and a lower support arm. The main function of the upper support arm is to hold the edge of the pipe section and limit the movement of the pipe section; the function of the lower support arm is to lift the pipe section, bear the weight of the pipe section, and prevent the pipe section from falling off during the transportation of the pipe section.

[0027] The arc-shaped top plate is an external component of the support arm, which is arranged on the top of the inner rod of the support arm. It is welded by an arc-shaped steel plate and a section of square steel pipe, and is connected to the end of the inner rod of the horizontal support arm by bolts. Its main function is to increase the contact area between the telescopic frame and the ventilation pipe wall and protect the pipe wall from being scratched. The outer side of the arc-shaped steel plate is designed to be made of rubber material to increase the friction between the arc-shaped top plate and the ventilation pipe wall.

[0028] The pallet is an external part of the inner rod of the support arm, which is made of plates of different sizes and shapes. The overall design is a "J" shape structure. Two notched connection holes are designed on the connecting plate. One is to increase the stability of the pallet, and the other is that the distance between the pallet and the inner rod of the support arm can be adjusted within a small range. The main function is to support the two ends of the pipe section to prevent slipping during the lifting process.

[0029] The main frame is welded by splicing 4 long rectangular steel pipes and 16 end rectangular steel pipes. The main frame is spliced ​​according to the spatial layout of the active telescopic frame and the passive telescopic frame and the design drawings. The main frame has two main functions: one is to fix the active and passive telescopic frames, so that the two maintain the designed spatial layout and vertical state, while limiting the up and down movement of the active and passive telescopic frames; the second is to serve as a fulcrum for lifting and transportation. When lifting, the slings and shackles are connected to the main frame to lift the tooling, which is convenient and quick. When carrying manually, a long rod with an outer dimension smaller than the inner diameter of the main frame rectangular tube is passed through the rectangular tube to assist manual transportation.

[0030] A specific example is given below.

[0031] Figure 1 The figure shows the general layout of an adjustable large diameter ventilation pipe section storage and transfer tooling. Figure 1 In the figure, 1 is the front active telescopic frame, 2 is the left passive telescopic frame, 3 is the ratchet pawl mechanism, 4 is the rear active telescopic frame, and 5 is the right passive telescopic frame. Before use, install all parts of the tooling according to the diagram, adjust the length of the telescopic rod, and insert the screw into the limit hole to fix it. When in use, place the tooling inside the pipe section, rotate the shaft through the rocker in 3, and each telescopic frame will extend outward synchronously. When the arc-shaped top plate on the telescopic frame fits tightly with the inner wall of the pipe section, the ratchet pawl mechanism is locked to prevent the gear rotation from causing the telescopic frame to accidentally shrink.

[0032] After the tooling is used, the cam knob on the ratchet pawl mechanism is rotated to make the ratchet rotate and the telescopic frame begins to retract. According to the actual situation, the diameter range of the tooling that can be extended is φ1600-φ3200mm. During the storage of pipe sections, it can effectively carry out hoisting and handling operations at the same time. Referring to the tooling structure form of this design, tooling of different specifications and sizes can be made.

[0033] Figure 2 It is a schematic diagram of the structure of the gear rack mechanism. Figure 2In the figure, 6 is the lower support arm outer rod, 7 is the lower spur rack, 8 is the spur gear, 9 is the upper support arm outer rod, 10 is the upper spur rack, and 11 is the mechanism box. The lower spur rack 7 is welded to the lower support arm outer rod 6, and the upper spur rack 10 is welded to the upper support arm outer rod 9. The structural design purpose of the mechanism box 11 is to fix the relative position relationship of the gear, rack or outer rod. The spur gear 8 is meshed with the lower spur rack 7 and the upper spur rack 10 at the same time. The two spur racks always remain parallel along the side wall of the mechanism box. The spur gear 8, the lower spur rack 7 and the upper spur rack 10 are arranged in a "Z" shape as a whole. When the spur gear 8 rotates counterclockwise, the lower spur rack 7 moves to the right and the upper spur rack 10 moves to the left, so that the lower support arm outer rod 6 moves to the right and the upper support arm outer rod 9 moves to the left, so as to achieve the purpose of extending the telescopic frame outward. Similarly to the above, when the gear rotates clockwise, the telescopic frame shrinks inward.

[0034] Figure 3 Figure 1 is a schematic diagram of the structure of the ratchet and pawl mechanism. Figure 3 In the figure, 11 is the mechanism box, 12 is the left pawl, 13 is the left spring, 14 is the ratchet, 15 is the rotating shaft, 16 is the rocker, 17 is the right spring, 18 is the right pawl, 19 is the cam, 20 is the right ratchet positioning screw, 21 is the left ratchet positioning screw, 22 is the mechanism box cover fastening screw (in order to clearly show the internal structure of the ratchet and pawl mechanism, the cam knob and the mechanism box cover are hidden). All parts are processed according to the design, and all parts are assembled according to the structural diagram. State before use: The left pawl 12 and the right pawl 18 are pressed against the teeth of the ratchet 14 under the action of the left spring and the right spring 17, so that the clockwise and counterclockwise rotation of the ratchet are blocked. When in use, the cam 19 is rotated to the left by the cam knob, and the left pawl 12 is deflected to the left by force. At this time, the left pawl 12 is out of contact with the teeth of the ratchet 14, and the right pawl 18 still supports the teeth of the ratchet 14 under the action of the right spring 17, and the ratchet 14 can rotate counterclockwise through the rocker 16. After the ratchet 14 rotates to the specified position, the cam 19 is rotated to the middle position. At this time, the left pawl 12 rebounds and supports the teeth of the ratchet 14 under the action of the spring, and the ratchet 14 cannot rotate at this time. Similarly, the cam 19 is rotated to the right by the cam knob, and the right pawl 18 is deflected to the right by force. At this time, the right pawl 18 is out of contact with the teeth of the ratchet 14, and the ratchet 14 can rotate clockwise through the rocker 16. Through the working principle of the ratchet and pawl mechanism, the rotation of the ratchet is effectively limited, thereby preventing the telescopic frame from accidentally retracting, and playing a protective role. The ratchet rotates coaxially with the gear, and the gear is controlled by controlling the rotation of the ratchet.

[0035] Figure 4It is a schematic diagram of the combination of the inner rod of the support arm and the supporting arm, 23 is a "J"-shaped pallet component, which supports the pipe section during lifting and transportation; 24 is a distance-adjusting bolt, which can adjust the outward extension distance of the pallet component; 25 is the inner rod of the supporting arm, 26 is the outer rod of the supporting arm, and the two rods form a telescopic structure; 27 is a "fishtail" structure, which can enable the supporting arm to achieve a small angle deflection; 28 is an arc-shaped top plate, and the side in contact with the wall of the pipe section is designed to be rubber for anti-slip effect; 29 is a square connecting sleeve, 30 is a connecting bolt, and the square connecting sleeve 29 is connected to the supporting arm through the connecting bolt 30; 31 is the inner rod of the support arm, which forms a telescopic structure with the outer rod of the support arm.

[0036] Assemble according to the design and diagram. After the outer rod of the support arm is combined with the inner rod 31 of the support arm, the support arm moves accordingly through the meshing movement of the gear rack. Limiting holes are designed on the outer rod of the support arm and the inner rod 31 of the support arm, and the length of the support arm is increased by extending the inner rod. When the arc-shaped top plate 28 fits with the wall of the ventilation pipe section, adjust the relative length of the inner rod 25 of the support arm and the outer rod 26 of the support arm, fix it with the limit bolts, and then adjust the swing angle of the support arm so that the edge of the pipe section completely falls into the "J"-shaped tray member 23, and then fix the pipe section with the distance adjusting bolt 24. The upper support arm and the lower support arm operate in the same way. The main function of the tray member on the upper support arm is to cooperate with the "J"-shaped tray member 23 of the lower support arm to fix the ventilation pipe section.

[0037] Figure 5 The active telescopic frame is a schematic diagram of the structure, in which 3 is a ratchet pawl mechanism, 23 is a "J"-shaped tray member, 28 is an arc-shaped top plate, 31 is a support arm, 28 is an arc-shaped top plate, and 32 is a support arm. The active telescopic frame is assembled according to the design and the diagram. The ratchet pawl mechanism 3 cooperates with the gear rack mechanism through the internal rotating shaft to achieve the effect of coaxial rotation. By rotating the rocker on the ratchet pawl mechanism, the ratchet and the gear rotate, so that the left and right parts of the telescopic frame can be extended and retracted synchronously. The structural characteristics of the ratchet pawl mechanism 3 prevent the gears from rotating in the same direction, thereby ensuring safety during use. The active telescopic frame is connected to the passive telescopic frame through a rotating shaft, so that the passive telescopic frame moves synchronously with the active telescopic frame.

[0038] Figure 6 This is an axonometric drawing of the tooling of the present invention. Figure 7 To use the top view of the effect, after the curved top plate on the telescopic frame is close to the pipe wall, use a total of 8 pallet parts above and below to fasten the pipe section, use the main frame of the tooling as the lifting point for lifting and transportation, use slings and slings to connect to the main frame of the tooling, and then you can carry out the lifting operation.

[0039] The effects of the present invention are mainly reflected in the following aspects: This tool is aimed at the storage and transportation of large-diameter ventilation pipe segments. The two major characteristics of this type of ventilation pipe segments are large size and thin pipe wall. Some ventilation pipe segments have no flanges at both ends. Therefore, during the storage and transportation process, the pipe segment will usually undergo an elliptical deformation. According to the structural characteristics of the present tool, the pipe segment is structurally reinforced from the inside of the pipe segment so that the pipe segment has a filled effect. When the ventilation pipe segment is subjected to external force or its own gravity, the inside of the pipe segment is supported to avoid deformation. The support arm in this tool is used in the process of lifting and transporting the ventilation pipe segment. The pallet is designed to fit the pipe mouth, and the pipe segment is supported during the lifting and transportation process, which is convenient for use.

[0040] Specifically, it includes the following features:

[0041] Adjustability

[0042] 1) Dynamic adjustment. The tooling of the present invention adopts the design of a gear rack motion mechanism, the gear is meshed with a double rack, the rack is fitted with a support arm, and the four support arms can be synchronously reciprocated by rotating the gear. When the tooling is used, the arc-shaped top plate on the support arm is closely attached to the ventilation pipe wall, and the internal space structure of the ventilation pipe section is strengthened and not easily affected by external forces.

[0043] 2) Fixed adjustment: The support arm and the supporting arm in the present invention are both telescopic structures. By adjusting the relative positions of the limiting holes of the inner rod and the outer rod and fixing them with limiting bolts, the telescopic frame can achieve the purpose of fixed adjustment.

[0044] 3) Small angle adjustment. The "fishtail" structure designed at the root of the outer rod of the support arm can achieve a small angle deflection on the vertical plane with the connecting bolt as the axis, making it easier for the tray structure at the end of the inner rod of the support arm to buckle the pipe section more closely.

[0045] Versatility

[0046] 1) Anti-deformation of pipe sections. This tool has four support arms symmetrically distributed, extending from the inside of the pipe section to the outside until it supports the wall of the pipe section. The ratchet and pawl mechanism locks the gear to prevent rotation, strengthens the internal structure of the pipe section, and increases support, so that the pipe section is not easily deformed when subjected to external force. The horizontal support arms and vertical support arms designed in this tool are telescopic structures, which can be applied to air duct sections of different diameters and lengths. Before use, set the length of the inner rod extension according to the telescopic range, and then use screws to fix it.

[0047] 2) Transfer and hoisting. In this tooling, a "J"-shaped pallet is designed on the support arm. During the hoisting process, the pallet on the lower support arm can hold the lower edge of the pipe section, and the pallet on the upper support arm can hold the upper edge of the pipe section upside down. In this way, the pipe section is not easy to move during the hoisting process. Then, the telescopic frame can be fastened with a sling to realize the hoisting of the ventilation pipe section.

[0048] 3) Manual handling. The ventilation pipe section is a thin annular object with a smooth surface. When it is manually carried, there is no fulcrum, which is not conducive to handling. After using this tooling, the overall structure of the ventilation pipe section is strengthened, and the main frame is used as a fulcrum, which is convenient for manual handling.

[0049] 4) Convenient storage. After the tooling is used, the internal structure of the pipe section is strengthened and can withstand the extrusion of external forces. When the product is stored, it can be placed horizontally and the pipe sections can be stacked, which greatly reduces the floor space of the temporary storage area.

[0050] Interchangeability

[0051] The arc-shaped top plate and pallet designed in this tool are replaceable parts, which are aimed at round pipe sections. If the arc-shaped top plate is changed to a flat top plate and the arc-shaped groove on the pallet is changed to a straight groove, large-sized square pipe sections can be hoisted. If the coaxial rotation structure of the active telescopic frame and the passive telescopic frame is cancelled, and a ratchet pawl control device is added to the passive telescopic frame, the active telescopic frame and the passive telescopic frame can be controlled separately to extend the length, which can be suitable for the storage and hoisting of rectangular pipe sections.

[0052] Security

[0053] This tooling uses a ratchet pawl mechanism as a protective device. The ratchet and the gear are organically combined and can rotate synchronously. During operation, the rotation of the ratchet can control the rotation of the gear. The pawl supports the ratchet teeth under the action of the spring, ensuring that the ratchet pawl mechanism cannot rotate without external interference. The cam can be rotated by rotating the cam button to control the working state of the pawl, which can effectively prevent accidents caused by gear rotation.

Claims

1. An adjustable tool suitable for storing and transporting large diameter ventilation pipe sections, characterized by: It includes four parts: an active telescopic frame, a passive telescopic frame, a ratchet pawl mechanism, and a main frame. The active telescopic frame and the passive telescopic frame are arranged vertically on the same horizontal plane, and the relative position relationship between the two is fixed by the main frame to always maintain the vertical relationship between the two.

2. An adjustable tooling for storing and transporting large diameter ventilation pipe sections as claimed in claim 1, characterized in that: The structures of active telescopic frame and passive telescopic frame mainly include: gear rack mechanism, telescopic rod structure, arc-shaped top plate structure, among which, the telescopic rod structure is a support arm and a supporting arm. The telescopic frame is distributed in an "H" shape as a whole, and the middle part is a gear rack mechanism. The rack is connected to the outer rod of the support arm by welding. The support arm extends and contracts with the rack due to the meshing movement of the gear and the rack. The end of the inner rod of the support arm is connected to the upper and lower supporting arms, and the outer rod of the supporting arm is connected to the inner rod of the support arm through a connecting piece. The top of the inner rod of the support arm is connected to the arc-shaped top plate structure, which increases the contact area between the tooling and the inner wall of the ventilation pipe section and protects the inner wall from being scratched. The ratchet in the ratchet and pawl mechanism rotates coaxially with the gear, and the gear rotates through the rotation of the ratchet.

3. An adjustable tooling for storing and transporting large diameter ventilation pipe sections as claimed in claim 2, characterized in that: The gear rack mechanism adopts a combination of "single gear and double racks", which consists of a spur gear, two spur racks, a bearing, and a rotating shaft. One gear is meshed with the two spur racks at the same time, and the two racks always remain parallel and are arranged in a "Z" shape with the spur gear as a whole. When the gear rotates, the gear and the rack mesh, thereby causing the two spur racks to extend and contract at the same time.

4. An adjustable tooling for storing and transporting large diameter ventilation pipe sections as claimed in claim 3, characterized in that: The ratchet and pawl mechanism "rotates coaxially" with the gear and is composed of a ratchet, a pawl, a cam, a rocker, a ratchet mechanism box and a spring. The ratchet is arranged at the front of the ratchet mechanism box, and a cam is distributed in the middle of the rear, with two pawls distributed on both sides. When not in use, the two pawls hold the ratchet teeth under the action of the spring, so that the clockwise and counterclockwise rotation of the ratchet are both blocked. When in use, the cam is turned to the left through the cam knob, and the left pawl is forced to rotate to the left. At this time, the left pawl is out of contact with the ratchet teeth, and the right pawl still holds the ratchet teeth, so that the ratchet can rotate counterclockwise. Similarly, the ratchet can be rotated clockwise by turning the cam to the right. After the ratchet rotates to the specified position, the cam is rotated to the middle position. At this time, the left and right pawls rebound again under the action of the spring to hold the ratchet, and the ratchet cannot rotate.

5. An adjustable tooling for storing and transporting large diameter ventilation pipe sections as claimed in claim 4, characterized in that: The support arm is designed as a telescopic structure, which utilizes the working principle of a large tube covering a small tube so that the small tube can freely extend and retract under the restriction of the large tube. The support arm is composed of an outer rod, an inner rod, and a limit bolt. The inner rod and the outer rod are made of square tubes or rectangular tubes. The inner diameter of the outer rod is larger than the outer diameter of the inner rod, so that the outer rod is covered with the inner rod, and the inner wall of the outer rod serves as a guide for the inner rod. Limit holes are respectively arranged on the outer rod and the inner rod. Before use, according to the actual telescopic range of the telescopic frame, the inner rod and the outer rod are extended to a relative length through the limit bolts, and are fixed with bolts to keep the outer rod and the inner rod in a fixed state when in use. A rack is welded at the root of the outer rod, and the support arm moves synchronously with the rack during operation.

6. An adjustable tool suitable for storing and transporting large diameter ventilation pipe sections as claimed in claim 5, characterized in that: The supporting arm has the same structural form as the support arm. The inner rod and the outer rod are made of square tubes or rectangular tubes. The inner wall of the outer rod serves as a guide for the inner rod. The root of the outer rod of the supporting arm is connected to the end of the inner rod of the support arm through a square tube sleeve. The end of the inner rod of the supporting arm is connected and fixed to a pallet structure, which is fixed with bolts. A "fishtail" structure is arranged at the tail of the outer rod of the supporting arm, so that the supporting arm can achieve a small angle deflection in the vertical direction. The supporting arm is divided into an upper supporting arm and a lower supporting arm. The main function of the upper supporting arm is to hold the edge of the pipe section and limit the movement of the pipe section; the function of the lower supporting arm is to lift the pipe section, bear the weight of the pipe section, and prevent the pipe section from falling off during the transportation of the pipe section.

7. An adjustable tool suitable for storing and transporting large diameter ventilation pipe sections as claimed in claim 6, characterized in that: The arc-shaped top plate is an external component of the support arm, which is arranged on the top of the inner rod of the support arm. It is welded by an arc-shaped steel plate and a section of square steel pipe, and is connected to the end of the inner rod of the transverse support arm by bolts. The outer side of the arc-shaped steel plate is designed to be made of rubber material.

8. An adjustable tooling for storing and transporting large diameter ventilation pipe sections as claimed in claim 7, characterized in that: The pallet part is an external part of the inner rod of the support arm, which is spliced ​​by plates of different sizes and shapes. The overall design is a "J" shape structure, and two notched connection holes are designed on the connecting plate.

9. An adjustable tool suitable for storing and transporting large diameter ventilation pipe sections as claimed in claim 8, characterized in that: The main frame is formed by splicing and welding 4 long rectangular steel pipes and 16 end rectangular steel pipes. The main frame is spliced ​​and welded according to the spatial arrangement of the active telescopic frame and the passive telescopic frame.

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