CN112707053B - Manhole cover locking device for road transportation liquid dangerous cargo tank vehicle - Google Patents
Manhole cover locking device for road transportation liquid dangerous cargo tank vehicle Download PDFInfo
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- CN112707053B CN112707053B CN202011501487.3A CN202011501487A CN112707053B CN 112707053 B CN112707053 B CN 112707053B CN 202011501487 A CN202011501487 A CN 202011501487A CN 112707053 B CN112707053 B CN 112707053B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D90/00—Component parts, details or accessories for large containers
- B65D90/10—Manholes; Inspection openings; Covers therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60P—VEHICLES ADAPTED FOR LOAD TRANSPORTATION OR TO TRANSPORT, TO CARRY, OR TO COMPRISE SPECIAL LOADS OR OBJECTS
- B60P3/00—Vehicles adapted to transport, to carry or to comprise special loads or objects
- B60P3/22—Tank vehicles
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- Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
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Abstract
The invention discloses a manhole cover locking device for a road transportation liquid dangerous cargo tank vehicle, which comprises a crank rotationally connected with a manhole boss, two connecting rods rotationally connected with the manhole cover and the crank, and two operating handles positioned on the outer side of the manhole boss, wherein the two operating handles are fixedly connected with the two connecting rods; after the manhole cover is covered, the crank-slider mechanism is at the dead point position, and the connecting rod and the crank are in the overlapped collinear state. The manhole cover locking device for the tank vehicle for road transportation of the liquid dangerous goods realizes locking and fixing of the manhole cover by utilizing the extreme locking characteristic of the crank slide block mechanism, has the advantages of simple structure and safe and firm locking, and can ensure that the manhole cover is safely and firmly locked.
Description
Technical Field
The invention belongs to the technical field of special transport vehicles, and particularly relates to a manhole cover locking device for a road transport liquid dangerous cargo tank vehicle.
Background
National standard GB 18564.1-2019 road transport liquid hazardous cargo tank vehicle part 1: in the technical requirements of the metal normal-pressure tank body, the liquid dangerous goods transported by the dangerous goods tank vehicle are defined as the liquid goods which have dangerous characteristics of explosion, flammability, toxicity, infection, corrosion, oxidation and the like, are easy to cause personal injury, property loss or environmental pollution and need to be specially protected in transportation, storage, production, operation, use and treatment. And the manhole cover of the road transportation liquid dangerous cargo tank vehicle is set for injecting liquid into the top and facilitating the working personnel to enter the tank body for working or overhauling, and meanwhile, the liquid in the tank is sealed, so that the leakage effect in the transportation process is prevented. The national standard GB 18564.1-2019 requires that the tank body is provided with at least one manhole, generally can be arranged at the top of the tank body, and each sub-bin is provided with at least one manhole; the manhole should be a round hole with a nominal diameter greater than or equal to 500mm or an elliptical hole with a nominal diameter of 500mm x 400 mm. The technical requirements and test methods for manhole covers of tank vehicles for road transportation of flammable liquid dangerous goods by QC/T1065-2017 are strictly specified.
When the tank vehicle for the liquid dangerous goods transported on the road transports the liquid dangerous goods, the canned liquid dangerous goods are continuously vibrated due to the effects of inertia force of acceleration and deceleration driving, centrifugal force during sharp turning and the like, the manhole cover is required to be safe and firm after being closed in order to prevent the transported liquid dangerous goods from leaking from the cover opening, and the tank vehicle is convenient, flexible and free of clamping stagnation during opening the cover, and the requirements cannot be met by the prior art.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a manhole cover locking device for a road transportation liquid dangerous cargo tank vehicle, and aims to ensure that the manhole cover is safely and firmly locked.
In order to achieve the purpose, the invention adopts the technical scheme that: the manhole cover locking device for the tank vehicle for road transportation of the liquid dangerous goods comprises a crank rotationally connected with a manhole boss, two connecting rods rotationally connected with the manhole cover and the crank, and an operating handle positioned on the outer side of the manhole boss, wherein the two cranks and the two connecting rods are arranged; after the manhole cover is covered, the crank-slider mechanism is at the dead point position, and the connecting rod and the crank are in the overlapped collinear state.
The two connecting rods and the two cranks are symmetrically arranged.
One end of the connecting rod is rotatably connected with the manhole cover through a manhole cover pin shaft, the other end of the connecting rod is rotatably connected with one end of the crank through a hinge pin shaft, and the other end of the crank is rotatably connected with the manhole boss through a crank pin shaft.
One end of the connecting rod is provided with a manhole cover hinge hole through which a manhole cover pin shaft penetrates, the other end of the connecting rod is provided with a crank hinge hole through which the hinge pin shaft penetrates, one end of the crank is provided with a connecting rod pin hole through which the hinge pin shaft penetrates, and the other end of the crank is provided with a crank pin hole through which the crank pin shaft penetrates.
The manhole cover includes the boss and the lower boss of being connected with the bottom surface of last boss, and the diameter of lower boss is less than the diameter of last boss, the manhole boss has the accommodation hole of dodging the hole and letting lower boss embedding, dodges the hole and is located the below of accommodation hole and dodges the diameter of hole and be less than the diameter of accommodation hole, and the counter bore that the accommodation hole formed for the inside extension of beginning downwards towards the manhole boss from the top surface of manhole boss.
The lower boss is in a circular ring shape, the upper boss is in a cylindrical shape, the accommodating hole and the avoiding hole are both circular holes, and the operating handle is in a semicircular ring shape.
The boss is oval annular down, the cross section of going up the boss is oval, the holding hole with it is oval hole to dodge the hole, the operating handle is semiellipse annular.
When the crank slider mechanism is positioned at a dead point position, the operating handle is tightly attached to the outer circular surface of the manhole boss.
The manhole cover locking device for the tank vehicle for road transportation of the liquid dangerous goods realizes locking and fixing of the manhole cover by utilizing the extreme locking characteristic of the crank slide block mechanism, has the advantages of simple structure and safe and firm locking, and can ensure that the manhole cover is safely and firmly locked.
Drawings
The description includes the following figures, the contents shown are respectively:
FIG. 1 is a schematic view of a cylindrical manhole boss;
FIG. 2 is a schematic view of an elliptical cylindrical manhole boss;
FIG. 3 is a schematic view of a cylindrical manhole cover;
FIG. 4 is a schematic view of an elliptical cylindrical manhole cover;
FIG. 5 is a crank pin schematic;
FIG. 6 is a schematic view of the crank;
FIG. 7 is a schematic view of a connecting rod;
FIG. 8 is a schematic view of a circular joystick;
FIG. 9 is a schematic view of an elliptical joystick;
FIG. 10 is a schematic view of a manhole cover pin;
FIG. 11 is a schematic view of the polar locking device in an open position with the manhole cover being cylindrical;
FIG. 12 is a schematic view of the closed state of the polar locking device when the manhole boss is cylindrical;
FIG. 13 is a schematic view of the pole position locking device in an open state with the manhole boss being an elliptical cylinder;
FIG. 14 is a schematic view of the closed state of the polar locking device when the manhole boss is an elliptic cylinder;
labeled in the figure as: 1. a manhole boss; 101. an outer circular surface; 101A, a cylindrical counter bore; 101B, a first threaded hole; 101C, step surface; 102. an outer circular surface; 102A, an elliptic cylindrical counter bore; 102B, a first threaded hole; 102C, step surfaces; 2. a manhole cover; 201. a cylindrical manhole cover; 201B, a lower boss; 201D, an upper boss; 201A, a second threaded hole; 201C, interface; 202. an elliptical cylindrical manhole cover; 202B, a lower boss; 202D, an upper boss; 202A and a second threaded hole; 202C, interface; 3. a crank pin shaft; 3A, a threaded rod; 3B, cylindrical bosses; 3C, a crank pin shaft 3;3D, axially positioning a clamp spring groove by a crank; 4. a crank; 4A, a crank pin hole; 4B, connecting rod pin holes; 4C, a boss; 5. a connecting rod; 5B, a hinge hole of the manhole cover; 5A, a crank hinge hole; 5E, a motion plane; 5C, rectangular positioning grooves; 5D, a threaded hole; 5F, a side surface; 6. a control handle; 601. a circular operating handle; 601C, a semicircular structure; 601D, a semicircular gripper; 601A, positioning holes; 601B, an upper plane; 602. an elliptical manipulating handle; 602C, a semi-elliptical arc structure; 602D, a semicircular gripper; 602A, positioning holes; 602B, an upper plane; 7. a manhole cover pin shaft; 7A, a threaded shaft; 7D, a cylindrical boss; 7B, a hinge shaft; 7C, positioning a clamp spring groove.
Detailed Description
The following detailed description of the embodiments of the present invention will be given with reference to the accompanying drawings for a purpose of helping those skilled in the art to more fully, accurately and deeply understand the concept and technical solution of the present invention and to facilitate its implementation.
As shown in fig. 1 to 14, the invention provides a manhole cover locking device for road transportation of a liquid dangerous cargo tank vehicle, which comprises a crank 4 rotationally connected with a manhole boss 1, a connecting rod 5 rotationally connected with a manhole cover 2 and the crank 4, and an operating handle 6 positioned on the outer side of the manhole boss 1, wherein two cranks 4 and two connecting rods 5 are arranged, the operating handle 6 is fixedly connected with the two connecting rods 5, and the crank 4, the connecting rod 5, the manhole boss 1 and the manhole cover 2 form a crank slider mechanism; after the manhole cover 2 is covered, the crank-slider mechanism is at the dead point position, and the connecting rod 5 and the crank 4 are in the overlapped collinear state.
Specifically, as shown in fig. 11 to 14, two connecting rods 5 and two cranks 4 are symmetrically arranged, a manhole cover 2 and a manhole boss 1 are coaxially arranged, the manhole cover 2 is located between the two connecting rods 5, the manhole boss 1 is located between the two cranks 4, an included angle between the two connecting rods 5 is 180 degrees, correspondingly, an included angle between the two cranks 4 is also 180 degrees, one control handle 6 is provided, the control handle 6 is fixedly connected with the two connecting rods 5, and the control handle 6 is used for being held by a hand of an operator. Two sets of completely symmetrical slider-crank mechanisms (where the manhole cover 2 is equivalent to a slider moving along a counter bore in the manhole boss) are used and are arranged on both sides of the manhole boss 1. The operating handle 6 is fixedly connected with the two connecting rods 5 at the two sides, so that the linkage of the two groups of symmetrical crank sliding block mechanisms is realized. When the crank slider mechanism is at the dead point position, the operating handle 6 is tightly attached to the outer circular surface of the manhole boss 1.
Moreover, the two connecting rods 5 at two sides are fixedly connected by the operating handle 6, so that the operating handle 6 becomes a manual operation force application component for locking and unlocking the crank slider mechanisms (namely, the locking device for the manhole cover polar position of the road transportation liquid dangerous cargo tank vehicle) symmetrically arranged at two sides of the manhole boss 1, and the manual operation force application component is lighter and more labor-saving compared with the way that the force application component is arranged on the crank 4.
As shown in fig. 11 to 14, one end of the connecting rod 5 is rotatably connected to the manhole cover 2 through a manhole cover pin 7, the other end of the connecting rod 5 is rotatably connected to one end of the crank 4 through a hinge pin, and the other end of the crank 4 is rotatably connected to the manhole boss 1 through a crank pin 3. The axis of the manhole cover pin shaft 7 is vertical to the axis of the manhole cover 2, the axis of the crank pin shaft 3 is vertical to the axis of the manhole boss 1, and the axis of the crank pin shaft 3 is parallel to the axis of the manhole cover pin shaft 7. One end of the connecting rod 5 is provided with a manhole cover hinge hole through which the manhole cover pin shaft 7 penetrates, the other end of the connecting rod 5 is provided with a crank hinge hole through which the hinge pin shaft penetrates, one end of the crank 4 is provided with a connecting rod pin hole through which the hinge pin shaft penetrates, and the other end of the crank 4 is provided with a crank pin hole through which the crank pin shaft 3 penetrates.
As shown in fig. 1 and 3, the manhole cover 2 includes an upper boss and a lower boss connected to a bottom surface of the upper boss, the lower boss has a diameter smaller than that of the upper boss, and the upper boss and the lower boss are coaxially disposed. Manhole boss 1 has the hole of dodging and lets the holding hole of boss embedding down, dodges the hole and holds the hole and be coaxial setting, dodges the hole and is located the below of holding the hole and the diameter of dodging the hole and is less than the diameter of holding the hole, holds the counter bore that the hole formed for starting to extend downwards towards the inside of manhole boss 1 from the top surface of manhole boss 1, dodges the through-hole that the hole formed for starting to extend downwards towards the bottom surface of manhole boss 1 from holding the hole bottom.
The sealing part of the tank body of the vehicle is a manhole boss 1, and the tank body can have two different cross-sectional shapes of a circular shape and an oval shape according to the requirements of GB 18564.1-2019.
As shown in fig. 1, the manhole boss 1 is a cylindrical structure, the cross section of the manhole boss 1 is a circle with a radius of 500mm, the outer circular surface 101 of the manhole boss 1 is a cylindrical surface, the accommodating hole and the avoiding hole are circular holes, the accommodating hole is a cylindrical counter bore 101A, and the depth of the accommodating hole is H mm (the accommodating hole and the avoiding hole are circular holes, the accommodating hole is a cylindrical counter bore 101A)Step surfaces 101C are formed between the holes, the depth of each accommodating hole is the vertical distance between the top surface of the manhole boss 1 and the step surface 101C, the top surface of the manhole boss 1 and the step surface 101C are parallel planes, the wall thickness is delta mm (the tank body can be made of different materials such as steel, aluminum and aluminum alloy, and the tank body can be selected according to the national standard GB 18564.1-2019). Two first threaded holes 101B are formed in the outer circular surface 101 of the manhole boss 1, the first threaded holes 101B are used for allowing the crank pin shaft 3 to be inserted, the axis of each first threaded hole 101B is perpendicular to that of the manhole boss 1, the two first threaded holes 101B are coaxially arranged, and the perpendicular distance between the axis of each first threaded hole 101B and the step surface 101C of the accommodating hole is H 2 。
As shown in fig. 2, the manhole boss 1 has an elliptical structure, the cross section of the manhole boss 1 has a long axis and a short axis respectively equal to 500mm and 400mm, the cross section of the outer circular surface 101 of the manhole boss 1 has an elliptical shape, and the accommodating hole and the avoiding hole are elliptical holes. The accommodating hole is an elliptic cylindrical counter bore 102A, the depth of the accommodating hole is H mm (a step surface 102C is formed between the accommodating hole and the avoidance hole, the depth of the accommodating hole is the vertical distance between the top surface of the manhole boss 1 and the step surface 102C, the top surface of the manhole boss 1 and the step surface 102C are parallel planes), and the wall thickness is delta mm (the wall thickness can be selected according to the national standard GB 18564.1-2019 according to the difference of steel, aluminum and aluminum alloy which are used as materials of the tank body). Be equipped with two first screw holes 102B on manhole boss 1's excircle face 102, the axis of first screw hole 102B is mutually perpendicular with manhole boss 1's axis, and two first screw holes 102B are coaxial setting, and the axis of first screw hole 102B is the oval minor axis in cross-section, and first screw hole 102B is used for letting crank pin axle 3 insert, and the perpendicular distance between the axis of first screw hole 102B and the step face 101C of holding the hole is H 2 。
In order to match the manhole cover 1, the manhole cover 2 is also divided into two different cross-sectional shapes, circular and elliptical (cf. GB 18564.1-2019).
As shown in fig. 1 and 3, the manhole boss 1 is a cylindrical structure, the accommodating hole and the avoiding hole are circular holes, the lower boss 201B is annular, the upper boss 201D is cylindrical, the diameter of the lower boss 201B is the same as that of the accommodating hole, and the upper boss 201D and the lower boss 201B are arrangedThe interface 201C is arranged between the manhole cover and the manhole boss, the interface 201C is a plane perpendicular to the axes of the upper boss and the lower boss, after the manhole cover 2 is fixed on the manhole boss 1, the interface 201C is attached to the top surface of the manhole boss 1, and the interface is also the bottom surface of the upper boss. The outer diameter of the lower boss 201B is smaller than that of the upper boss, the excircle radius of the lower boss 201B is (500-delta) mm, and the height of the lower boss 201B is H' mm; two second threaded holes 201A are formed in the cross section, perpendicular to the axis of the cylinder, of the outer circle surface of the upper boss 201D, the axes of the two second threaded holes 201A coincide with the diameter of the cross section circle, the two second threaded holes 201A are coaxially arranged, the second threaded holes 201A are used for allowing the manhole cover pin shaft 7 to be inserted, and the perpendicular distance between the axis of the second threaded holes 201A and the interface 201C is H 1 。
As shown in fig. 2 and 4, the manhole boss 1 is of an elliptical structure, the accommodating hole and the avoiding hole are elliptical holes, the lower boss 202B is of an elliptical ring shape, the cross section of the upper boss 202D is elliptical, the lengths of the major axis and the minor axis of the lower boss 201B are the same as those of the accommodating hole, an interface 202C is arranged between the upper boss 202D and the lower boss 202B, the interface 202C is a plane perpendicular to the axes of the upper boss and the lower boss, and after the manhole cover 2 is fixed on the manhole boss 1, the interface 202C is attached to the top surface of the manhole boss 1. The section of the lower boss 202B is an ellipse with the major and minor axes respectively equal to (500-delta) mm and (400-delta) mm, and the height of the lower boss 202B is H' mm; two second threaded holes 202A are formed in the cross section, perpendicular to the axis of the elliptic cylinder, of the outer circular surface of the upper boss 202D, the axis of each second threaded hole 202A is a short axis of the elliptic cross section, the two second threaded holes 202A are coaxially arranged, each second threaded hole 202A is used for allowing a manhole cover pin shaft 7 to be inserted, and the perpendicular distance between the axis of each second threaded hole 202A and the interface 202C is H 1 。
As shown in fig. 5, the crank pin 3 includes a threaded rod 3A, a cylindrical boss 3B which is coaxially and fixedly connected with the threaded rod 3A, and a first pin body 3C which is coaxially and fixedly connected with the cylindrical boss 3B, a first clamp spring groove 3D is provided on the first pin body 3C, and the first clamp spring groove 3D is a circular groove extending along the whole circumferential direction on the outer circumferential surface of the first pin body 3C. The cylindrical boss 3B is positioned between the threaded rod 3A and the first pin shaft body 3C, and the diameter of the cylindrical boss 3B is larger than that of the threaded rod 3A and the first pin shaft body 3C. The threaded rod 3A is provided with an external thread, the threaded rod 3A is inserted into a first threaded hole 101B or 102B in the manhole boss 1, and the threaded rod 3A is in threaded connection with the manhole boss 1. During assembly, the threaded rods 3A of the two crank pin shafts 3 are screwed into the two first threaded holes 101B or 102B of the manhole boss 1, and the first pin shaft body 3C penetrates through a crank pin hole in the crank 4.
As shown in fig. 6, the crank 4 has a rod-like structure with a rectangular cross section, and one end of the crank 4 is provided with a crank pin hole 4A and the other end of the crank 4 is provided with a connecting rod pin hole 4B. The crank 4 is provided with a boss 4C, the boss 4C and the connecting rod pin hole 4B are located at the same end of the crank 4, the boss 4C extends out towards one side of the crank 4, the boss 4C is used for compensating a gap between the motion planes of the crank 4 and the connecting rod 5 during assembly, the connecting rod 5 is ensured to be compactly assembled on the outer side of the crank 4, the boss 4C is located between the crank 4 and the connecting rod 5, the connecting rod pin hole 4B penetrates through the boss 4C, and the crank 4 is located between the connecting rod 5 and the manhole boss 1. During assembly, a crank pin hole 4A of the crank 4 is arranged in a first pin shaft body 3C of the crank pin shaft 3, and a clamp spring (not shown in the figure) is arranged in a first clamp spring groove 3D on the outer end face, so that the crank 4 is axially fixed relative to the crank pin shaft 3.
As shown in fig. 7, the length of the connecting rod 5 is greater than that of the crank 4, the connecting rod 5 is a rod-shaped structure, the cross section of the connecting rod is rectangular, one end of the connecting rod 5 is provided with a manhole cover hinge hole 5B, the other end of the connecting rod 5 is provided with a crank hinge hole 5A, and the middle of the motion plane 5E of the connecting rod 5 is provided with a rectangular positioning slot 5C and a threaded hole 5D. The outer surface of the link 5 comprises a plane of movement 5E and a side 5F, the plane of movement 5E and the side 5F being perpendicular to each other. The end of the operating handle 6 is embedded into the rectangular positioning groove 5C of the connecting rod 5, the two ends of the operating handle 6 are fixedly connected with the two connecting rods 5 through screws, and the screws are screwed into the threaded holes 5D.
The operating handle 6 has two different structures according to the manhole boss 1, and also has two different structural forms.
As shown in fig. 1 and 8, the manhole boss 1 is a cylindrical structure, the outer circumferential surface of the manhole boss 1 is a cylindrical surface, the operating handle 6 is a semicircular ring and is an axisymmetric structure, the main body of the operating handle 6 is a semicircular structure 601C, the radius of the semicircular structure 601C is slightly larger than the radius of the outer circumferential surface 101 of the manhole boss 1, and the radius of the semicircular structure 601C is 500+3mm; the middle position in the arc length direction of the semicircular structure 601C is provided with a hand grip 601D with the diameter of 8cm, the hand grip 601D is used for holding the hand of an operator, and the positions, close to the two ends, of the semicircular structure 601C are respectively provided with a positioning hole 601A matched with the rectangular positioning groove 5C and the circular threaded hole 5D. When the operating handle 6 is assembled with the connecting rod 5, the inner sides of the two ends of the operating handle 6 are inserted into the rectangular positioning groove 5C formed in the middle of the moving plane 5E of the connecting rod 5, the positioning hole 601A is aligned with the threaded hole 5D, and then the fastening screw (not shown) is installed, so that the operating handle 6 and the connecting rod 5 are fixedly connected. Through the matching arrangement of the rectangular positioning groove 5C and the threaded hole 5D with the positioning hole 601A, the operating handle 6 can be prevented from loosening due to relative movement between the operating handle 6 and the connecting rod 5 in the operating process, and the upper plane 601B of the operating handle 6 can be ensured to be vertical to the movement plane 5E of the connecting rod 5 and the side surface 5F of the connecting rod 5 at the same time, so that the operating handle 6 can be ensured to be tightly attached to the outer circular surface of the manhole boss after the manhole cover is covered. The upper plane 601B of the bar handle 6 is a plane perpendicular to the axis of the bar handle 6.
As shown in fig. 2 and 9, the manhole boss 1 has an elliptical structure, the cross section of the outer circumferential surface of the manhole boss 1 has an elliptical shape, and the operating handle 6 has a semi-elliptical ring shape and an axisymmetric structure. The main body part of the operating handle 6 is a semi-elliptical arc structure 602C, and the long and short axes of the semi-elliptical arc structure 602C are respectively equal to 500+3mm and 400+3mm (a semi-elliptical arc is reserved by taking the short axis as a symmetry axis); a circular gripper 602D with the diameter of 8cm is arranged in the middle of the semi-elliptical arc 602C, the gripper 602D is used for holding by the hand of an operator, and positioning holes 602A matched with the rectangular positioning grooves 5C and the circular threaded holes 5D are respectively arranged in positions close to the two ends of the semi-elliptical arc 602C. When the semi-elliptical operating handle 6 is assembled with the connecting rod 5, the inner sides of the two ends of the operating handle 6 are inserted into the rectangular positioning groove 5C formed in the middle of the movement plane 5E of the connecting rod 5, the positioning hole 602A is aligned with the circular threaded hole 5D, and then the fastening screw (not shown in the figure) is installed, so that the operating handle 6 and the connecting rod 5 are fixedly connected. Through the matching arrangement of the rectangular positioning groove 5C and the circular threaded hole 5D with the positioning hole 602A, the operating handle 6 can be prevented from loosening due to relative movement with the connecting rod 5 in the operating process, and the upper plane 602B of the operating handle 6 can be ensured to be perpendicular to the moving plane 5E and the side surface 5F of the connecting rod 5 at the same time, so that the operating handle 6 can be ensured to be tightly attached to the outer circular surface of the manhole boss 1 after the manhole cover 2 is covered.
As shown in fig. 10, the manhole cover pin 7 includes a threaded shaft 7A, a cylindrical boss 7D coaxially and fixedly connected to the threaded shaft 7A, and a second pin body 7B coaxially and fixedly connected to the cylindrical boss 7D, wherein the second pin body 7B is provided with a second clamp spring groove 7C, and the second clamp spring groove 7C is an annular groove extending along the entire circumferential direction on the outer circumferential surface of the second pin body 7B. The cylindrical boss 7D is located between the threaded shaft 7A and the second pin shaft body 7B and the diameter of the cylindrical boss 7D is larger than the diameter of the threaded shaft 7A and the second pin shaft body 7B. The threaded shaft 7A is provided with an external thread, the threaded shaft 7A is inserted into a second threaded hole 201A or 202A on the manhole boss 1, and the threaded shaft 7A is in threaded connection with the manhole boss 1. During assembly, the threaded shafts 7A of the two manhole cover pin shafts 7 are screwed into the two second threaded holes 201A or 202A of the manhole cover 2, so that the manhole cover pin shafts 7 are fixedly connected with the manhole cover 2. When the connecting rod 5 is assembled, the second pin shaft body 7B penetrates through a manhole cover hinge hole in the connecting rod 5, and then the clamp spring is installed in the second clamp spring groove 7C, so that the connecting rod 5 is axially fixed relative to the manhole cover pin shaft 7; after the centers of the crank hinge hole 5A and the connecting rod pin hole 4B on the crank 4 are aligned, the hinge pin shaft is arranged and axially positioned.
Two cranks 4 are respectively arranged at the inner sides of the two connecting rods 5. As shown in fig. 11 to 14, when assembling, the crank 4 is installed on the manhole boss 1, and the crank 4 is rotated relative to the manhole boss 1; connecting the crank 4 and the connecting rod 5 by a hinge pin shaft; then the connecting rod 5 is connected with the manhole cover 2 through a manhole cover pin shaft 7, and the connecting rod 5 and the manhole cover 2 can rotate relatively; finally, the operating handle 6 is fixedly connected to the two connecting rods 5.
As shown in fig. 12 and 14, the closing process of the manhole cover 2 is as follows: the operator presses the manhole cover 2 into the manhole boss 1 with one hand, so that the lower boss falls into the containing hole (the lower boss 201B falls into the cylindrical counterbore 101A or the lower boss 202B falls into the elliptical cylindrical counterbore 102A); the other hand of the operator holds the grip of the operating handle and presses the operating handle 6 downwards until the inner circular surface of the operating handle 6 is attached to the outer circular surface of the manhole boss 1, at the moment, the connecting rod 5 and the crank 4 are respectively in the overlapped collinear position, the position of the manhole cover 2 is fixed, and the crank slider mechanism is in the dead point position, so that the manhole cover 2 cannot be opened even if a large force is acted on the manhole cover 2. When the cover is opened, the hand grip on the control handle 6 is pulled upwards by one hand, so that the manhole cover 2 can be separated from the manhole boss 1. During the opening and closing process of the manhole cover 2, the operating handle 6 can only move at one side of the manhole boss 1, so that the rotation angle range of the crank 4 is controlled within the range of 0-180 degrees.
The structural size of the device meets the condition that the sum of the distance from the axes of two threaded holes on a manhole boss to the lower end face of a counter bore in the manhole boss, the depth of the counter bore in the manhole boss and the distance from the axes of two threaded holes on a manhole cover 2 to the interface of the upper boss and the lower boss is equal to the length difference of a connecting rod 5 and a crank 4, when downward pressure is applied to an operating handle 6, the operating handle 6 can be tightly attached to the outer circular face of the manhole boss, the crank slider mechanism (namely, a polar position locking device of the manhole cover of a tank vehicle for transporting liquid dangerous goods on the road) is located at a locking position, the connecting rod 5 and the crank 4 are located at an overlapped collinear position, at the moment, if external force on the operating handle 6 is removed, the crank slider mechanism is located at a 'dead point' position, locking is very firm, and if unlocking is only external force couple moment is applied to the connecting rod 5 or the crank 4, the locking can be achieved.
The center distance between a crank pin hole 4A and a connecting rod pin hole 4B on the crank 4 is set to be L 1 (ii) a The center distance between a manhole cover hinge hole 5B on the connecting rod 5 and a crank hinge hole 5A is L 2 ；
According to the dead point locking principle of the crank sliding block mechanism, in order to ensure that the pole locking device of the manhole cover of the tank vehicle for road transportation of liquid dangerous goods realizes safe and firm locking, the pole locking conditions which need to be met are as follows: vertical distance H between axis of first threaded hole on manhole boss 1 and step surface in accommodating hole 2 Depth H of the receiving hole, second threaded hole axis on the manhole cover 2 and the manhole cover2 vertical distance H between the interfaces 1 Must be equal to the length L of the connecting rod 5 2 To the length L of the crank 4 1 I.e.:
H 2 +H+H 1 ＝L 2 -L 1 (1)
in order to ensure that the lower boss of the manhole cover 2 can smoothly leave the accommodating hole of the manhole boss 1 when the operating handle 6 moves upwards, the following conditions are satisfied:
H<2L 1 (2)
in order to ensure that the manhole cover 2 can freely rotate relative to the connecting rod 5 and does not interfere with the upper opening edge of the manhole boss 1 after the manhole cover 2 is opened, the following conditions must be satisfied:
H′<H (3)
L 1 +L 2 -(H 2 +H)>R (4)
in the above formula, H 2 Is the vertical distance between the axis of the first threaded hole on the manhole boss 1 and the step surface in the accommodating hole, H is the depth of the accommodating hole, H 1 Is the vertical distance, L, between the axis of the second threaded hole in the manhole cover 2 and the interface in the manhole cover 2 2 Is the length, L, of the connecting rod 5 1 Is the length of the crank 4 and H' is the height of the boss under the manhole cover. Wherein, R in the formula (4) takes the value, and for the cylindrical manhole cover 201, R is the radius of the bottom surface of the upper boss 201D (namely the radius of the circular interface); for an oval cylindrical manhole cover 202, r is the length of the semi-major axis of the bottom ellipse of the upper boss 202D (i.e., the length of the semi-major axis of the interface of the ellipse).
The invention is described above with reference to the accompanying drawings. It is to be understood that the specific implementations of the invention are not limited in this respect. Any insubstantial improvements over the methods and technical solutions of the present invention; the present invention is not limited to the above embodiments, and can be modified in various ways.
Claims (8)
1. The manhole cover locking device for the tank vehicle for road transportation of the liquid dangerous goods is characterized by comprising a crank rotationally connected with a manhole boss, two connecting rods rotationally connected with the manhole cover and the crank and an operating handle positioned on the outer side of the manhole boss, wherein the two cranks and the two connecting rods are arranged, the operating handle is fixedly connected with the two connecting rods, and the crank, the connecting rods, the manhole boss and the manhole cover form a crank slider mechanism; after the manhole cover is covered, the crank sliding block mechanism is positioned at a dead point position, and the connecting rod and the crank are in an overlapped collinear state;
one end of the connecting rod is rotatably connected with the manhole cover through a manhole cover pin shaft, the other end of the connecting rod is rotatably connected with one end of the crank through a hinge pin shaft, the other end of the crank is rotatably connected with the manhole boss through a crank pin shaft, the manhole boss is provided with a first threaded hole into which the crank pin shaft is inserted, and the manhole cover is provided with a second threaded hole into which the manhole cover pin shaft is inserted; the axis of the manhole cover pin shaft is vertical to the axis of the manhole cover, the axis of the crank pin shaft is vertical to the axis of the manhole boss, and the axis of the crank pin shaft is parallel to the axis of the manhole cover pin shaft;
the manhole cover comprises an upper boss and a lower boss connected with the bottom surface of the upper boss, the diameter of the lower boss is smaller than that of the upper boss, and the upper boss and the lower boss are coaxially arranged; the manhole boss is provided with an avoiding hole and an accommodating hole for embedding the lower boss, the avoiding hole and the accommodating hole are coaxially arranged, the avoiding hole is positioned below the accommodating hole, the diameter of the avoiding hole is smaller than that of the accommodating hole, the accommodating hole is a counter bore formed by extending downwards from the top surface of the manhole boss towards the inside of the manhole boss, and the avoiding hole is a through hole formed by extending downwards from the bottom of the accommodating hole towards the bottom surface of the manhole boss;
in order to ensure that the polar locking device of the manhole cover of the tank vehicle for transporting the liquid dangerous goods on the road realizes safe and firm locking, the polar locking condition which needs to be met is as follows: vertical distance H between axis of first threaded hole on manhole boss and step surface in accommodating hole 2 The depth H of the accommodating hole and the vertical distance H between the axis of the second threaded hole on the manhole cover and the interface on the manhole cover 1 Must be equal to the connecting rodLength L of 2 Length L of crank 1 A difference of (d);
in order to ensure that the lower boss of the manhole cover can leave the accommodating hole of the manhole boss when the operating handle moves upwards, the following conditions are met: h<2L 1 ；
In order to guarantee that the manhole cover can rotate relative to the connecting rod and does not interfere with the upper opening edge of the manhole boss after being opened, the requirement is as follows: h'<H，L 1 +L 2 -(H 2 +H)>R and H' are the height of a boss below the manhole cover, and R is the radius or the length of a semi-major axis of the interface of the manhole cover;
when the crank slider mechanism is positioned at a dead point position, the operating handle is tightly attached to the outer circular surface of the manhole boss;
the covering process of the manhole cover comprises the following steps: an operator presses the manhole cover into the manhole boss by one hand to enable the lower boss to fall into the containing hole; the other hand of the operator holds the gripper of the operating handle and presses the operating handle downwards until the inner circular surface of the operating handle is attached to the outer circular surface of the manhole boss, at the moment, the connecting rod and the crank are respectively positioned at the overlapped collinear position, the position of the manhole cover is fixed, and the crank slider mechanism is positioned at the dead point position;
when the cover is opened, the hand grip on the control handle is pulled upwards by one hand, so that the manhole cover can be separated from the manhole boss;
in the process of opening and closing the manhole cover, the operating handle can only move at one side of the manhole boss, so that the rotation angle range of the crank is controlled within the range of 0-180 degrees.
2. The lid locking device for manhole covers of tank vehicles for the road transportation of liquid dangerous cargo according to claim 1, wherein the two connecting rods and the two cranks are symmetrically arranged.
3. The cover locking device for manhole cover of tank truck for road transportation of liquid dangerous goods according to claim 1, wherein the manhole boss is a cylindrical structure, the cross section of the manhole boss is a circle with a radius of 500mm, the outer circular surface of the manhole boss is a cylindrical surface, and the accommodating hole and the avoiding hole are both circularThe hole, the holding hole is cylindrical counter bore, and the degree of depth of holding the hole is Hmm, and the wall thickness is delta mm, and the axis of first screw hole is mutually perpendicular with the axis of manhole boss, and two first screw holes are coaxial setting, and the perpendicular distance between the axis of first screw hole and the step face of holding the hole is H 2 。
4. The manhole cover locking device for road transportation of liquid dangerous cargo tank vehicles according to claim 3, wherein the operating handle is semi-circular and has an axisymmetric structure, and the main body of the operating handle has a semi-circular structure.
5. The locking device for the manhole cover of the tank vehicle for road transportation of liquid dangerous goods according to claim 1, wherein the manhole boss has an elliptical structure, the cross section of the manhole boss is elliptical with the long and short axes equal to 500mm and 400mm, respectively, the cross section of the outer circumferential surface of the manhole boss is elliptical, and the accommodating hole and the avoiding hole are elliptical holes; the containing hole is an elliptic cylindrical counter bore, the depth of the containing hole is H mm, the wall thickness is delta mm, the two first threaded holes are coaxially arranged, the axis of each first threaded hole is a short axis with an elliptic cross section, each first threaded hole is used for allowing a crank pin shaft to be inserted, and the vertical distance between the axis of each first threaded hole and the step surface of the containing hole is H 2 。
6. The manhole cover locking device of a tank vehicle for road transportation of liquid dangerous cargo according to claim 5, wherein the manipulating handle has a semi-elliptical ring shape and an axisymmetric structure, and the main body of the manipulating handle has a semi-elliptical arc structure.
7. The manhole cover locking device for tank vehicles for road transportation of liquid dangerous goods according to claim 5, wherein the lower boss has an elliptical ring shape, the upper boss has an elliptical cross section, the receiving hole and the avoiding hole have elliptical holes, and the manipulating handle has a semi-elliptical ring shape.
8. The manhole cover locking device for tank vehicles for road transportation of liquid dangerous goods according to claim 2, wherein the two cranks are respectively installed at the inner sides of the two connecting rods, and when assembled, the cranks are installed on the manhole boss and can rotate relative to the manhole boss; connecting the crank with the connecting rod through a hinge pin shaft; then the connecting rod is connected with the manhole cover through a manhole cover pin shaft, and the connecting rod and the manhole cover can rotate relatively; and finally, fixedly connecting the operating handle to the two connecting rods.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011501487.3A CN112707053B (en) | 2020-12-18 | 2020-12-18 | Manhole cover locking device for road transportation liquid dangerous cargo tank vehicle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011501487.3A CN112707053B (en) | 2020-12-18 | 2020-12-18 | Manhole cover locking device for road transportation liquid dangerous cargo tank vehicle |
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| CN112707053A CN112707053A (en) | 2021-04-27 |
| CN112707053B true CN112707053B (en) | 2023-03-14 |
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| CN209993559U (en) * | 2019-08-12 | 2020-01-24 | 南电电气有限公司 | Crank connecting rod mechanism |
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|---|---|---|---|---|
| CN201292749Y (en) * | 2008-11-20 | 2009-08-19 | 张泽洪 | Opening and closing device of air-tight door |
| CN202107246U (en) * | 2011-06-15 | 2012-01-11 | 金川集团有限公司 | Protective device for flange cover at discharge opening of tank truck |
| CN202346094U (en) * | 2011-11-18 | 2012-07-25 | 东莞市双知艺坊洁具有限公司 | Garbage can capable of automatically opening and closing cover |
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|---|---|
| CN112707053A (en) | 2021-04-27 |
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