Automatic clamping quick joint for loading arm

Abstract

The invention relates to the technical field of crane pipe joints, in particular to an automatic clamping quick joint of a crane pipe, which comprises a joint main pipe of the quick joint, one end of the joint main pipe is provided with a tank car flange butt joint surface, one side of a tank car flange is provided with a clamping jaw assembly, and the other end of the tank car flange is provided with a vertical pipe flange butt joint surface; the driving device comprises a driving motor, the driving motor drives the transmission spiral teeth to rotate, contraction and extension of the clamping jaws are rapidly achieved, and the connection and disconnection process of the tank car flange and the vertical pipe flange is more efficient. The clamping jaw assembly achieves firm locking of the tank car flange through movement of the telescopic base, and the reciprocating movement of the clamping jaw enables a connector to be more stable, safe and reliable. The two-stage heat insulation piece effectively isolates low temperature, and the driving device is prevented from being over-frozen; the guide mechanism ensures that the clamping jaw assembly moves along a preset track in the stretching and retracting process, matching is accurate, stretching and retracting and rotating are stable, the whole structure has good sealing performance, and the whole connecting process adapts to large loads and pressure through transmission spiral teeth and is safe and reliable.

Description

Technical Field

[0001] The invention relates to the technical field of crane pipe joints, in particular to an automatic clamping quick joint for a crane pipe. Background Art

[0002] The tank truck flange of the LNG tank truck is located at the bottom of the tank truck, retracted under the vehicle body, and is relatively low. A reinforcement plate is provided under the flange to implement docking connection in a limited space, and manual operation is impossible in a small space. The vertical pipe flange and the tank truck flange cannot be quickly and accurately docked and sealed together through ordinary quick connectors. After the vertical pipe flange and the tank truck flange are connected, they are in an ultra-low temperature environment. If they are used for too long, the various components will freeze to death, and they cannot operate normally or be flexibly disassembled, which has a great impact on the effective operation of the entire system and cannot effectively meet the on-site operation needs of quick connection and disconnection. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a crane pipe automatic clamping quick connector which automatically connects or disconnects the tank truck flange and the vertical pipe flange by driving the transmission screw gear through a driving device to quickly realize the contraction and extension of the claws.

[0004] The technical problem to be solved by the present invention is achieved through the following technical solutions: a crane pipe automatic clamping quick connector, including a quick connector connector main pipe, one end of the connector main pipe is provided with a tank car flange docking surface, the other end is provided with a vertical pipe flange docking surface, a driving device is provided near the vertical pipe flange, and a claw assembly is provided near the tank car flange. The driving device includes a driving motor, and the driving motor shaft end is provided with a transmission screw gear. The transmission screw gear includes a large gear and a small gear that are meshed with each other. The small gear is connected to the driving motor shaft end. The large gear is sleeved on the connector main pipe, and a telescopic seat is provided on the large gear near the tank car flange. The claw assembly is installed on the telescopic seat, and the telescopic seat drives the claw assembly to perform reciprocating telescopic motion along the axial direction. A double-stage heat insulation piece is provided between the large gear and the connector main pipe, and a guide mechanism is provided between the telescopic seat and the tank car flange. The guide mechanism drives the claw assembly to rotate in the circumferential direction. The transmission screw gear is driven by the driving motor to rotate, and the contraction and extension of the claw are quickly realized, and the connection and disconnection process between the tank car flange and the vertical pipe flange is more efficient. The claw assembly can firmly lock the tank car flange through the movement of the telescopic seat, and the reciprocating movement of the claw makes the joint more stable, safe and reliable. The double-stage thermal insulation effectively isolates the low temperature to prevent the drive device from freezing and dying; the guide mechanism ensures that the claw assembly moves along the predetermined trajectory during the telescopic process, with precise coordination, stable telescopic and rotation, and the overall structure has good sealing. The entire connection process is safe and reliable through the transmission screw gear to adapt to larger loads and pressures.

[0005] As a further solution of the present invention, the claw assembly includes three L-shaped claw bodies evenly distributed in a Y-shape along the circumferential direction, the L-shaped claw body includes a claw shaft and a hook body arranged perpendicular to the claw shaft, the hook body is threadedly matched with the claw shaft, one end of the hook body is provided with a chamfer on the free end face of the hook body, the surfaces of the three claw shafts are provided with S-shaped guide grooves, the S-shaped guide grooves cooperate with the guide mechanism, and the tail end of the claw shaft is provided with a limit column. The three L-shaped claw bodies arranged in a Y-shape are evenly stressed and clamped in a balanced manner. The free end face of the hook body is provided with a chamfer to reduce the wear of the claw when it contacts the groove truck flange during the contact process and reduce the friction error. The surface of the claw shaft is provided with an S-shaped guide groove that cooperates with the guide mechanism, so that the claw assembly maintains a stable motion trajectory to avoid the claw from being misplaced or stuck. The S-shaped guide groove realizes the smooth telescopic movement of the claw shaft to ensure that it is always in the predetermined operating position.

[0006] As a further solution of the present invention, the inner wall of the large gear wheel body includes a first hole step and a second hole step, the diameter of the first hole step is smaller than the diameter of the second hole step, the first hole step is tightly sleeved with the outer wall of the two-stage thermal insulation component, the inner wall of the second hole step is provided with an internal thread, the telescopic seat includes a telescopic tube, a mounting seat is provided on one side of the telescopic tube, the outer wall of the telescopic tube is provided with an external thread, and the telescopic tube and the second hole step thread are matched. The first hole step is tightly sleeved with the outer wall of the two-stage thermal insulation component, and there is no relative movement between the two-stage thermal insulation component and the large gear wheel body, so as to prevent loosening or damage. The telescopic tube and the second hole step thread are matched, with positioning accuracy and pull-out resistance, to prevent loosening, and to ensure safe and stable matching.

[0007] As a further solution of the present invention, the mounting seat includes three mounting ears evenly distributed along the circumferential direction, each mounting ear is provided with a countersunk hole, the claw shaft is arranged through the countersunk hole, and a butterfly spring sleeved on the claw shaft is provided in the countersunk groove of the countersunk hole, and the butterfly spring is limited in position by a limit column. The three mounting ears evenly distributed along the circumferential direction of the mounting seat are evenly stressed and disperse the load, thereby avoiding structural deformation or damage caused by concentrated stress. The claw shaft can pass through the countersunk hole tightly, and the claw shaft will not shift or loosen during the installation process. The countersunk groove makes the installation of the claw shaft more secure, and the butterfly spring is arranged in the countersunk groove, providing good elasticity, forming a clamping force between the claw shaft and the mounting seat, and at the same time being limited in position by the limit column, always in an effective compression range.

[0008] As a further solution of the present invention, the guide mechanism includes a guide ring column that is respectively matched with the three claw shaft sleeves, and a limit hole set in the radial direction is provided on the side wall of the guide ring column. A limit pin is provided in the limit hole. After the limit pin is inserted into the S-shaped guide groove, it slides and cooperates with the S-shaped guide groove. The claw shaft performs circumferential rotation as the limit pin slides in the S-shaped guide groove. The guide ring column cooperates with the claw shaft, and the claw shaft moves along a predetermined trajectory, effectively preventing the claw shaft from deviating or moving irregularly. The cooperation between the limit pin and the S-shaped guide groove ensures the precise control of the claw shaft when sliding, and it rotates more smoothly in the circumferential direction.

[0009] As a further solution of the present invention, guide plates are symmetrically arranged on both sides of the guide ring column, one end of the guide plate is tangent to the outer wall of the guide ring column and is fixedly arranged, and the other end of the guide plate is fixedly arranged on the outer wall of the joint main pipe, and a heat insulation hole is arranged on the guide plate, and a straight-through pressure injection oil cup is arranged on the guide ring column body. The guide plate realizes the guiding and heat insulation functions between the quick connector and the flange. The straight-through pressure injection oil cup injects lubricating oil into the guide ring column to reduce friction and wear.

[0010] As a further solution of the present invention, the double-stage thermal insulation component comprises a hollow annular sleeve, a first thermal insulation ring and a second thermal insulation ring are respectively provided at both ends of the hollow annular sleeve, the inner rings of the first thermal insulation ring and the second thermal insulation ring are interference fit with the outer wall of the joint main pipe, and the closed cavity enclosed by the joint main pipe and the hollow annular sleeve and the first thermal insulation ring and the second thermal insulation ring at both ends is set as a primary thermal insulation cavity;

[0011] The first outer ring of the thermal insulation ring and the second outer ring of the thermal insulation ring are interference fit with the inner tube of the telescopic tube, and the semi-open cavity surrounded by the telescopic tube and the hollow annular sleeve and the first and second thermal insulation rings at both ends is set as a secondary thermal insulation cavity.

[0012] The layered setting of the primary insulation cavity and the secondary insulation cavity effectively prevents the low temperature from being transferred from the inside of the flow channel to the moving parts, prevents the external heat source from being conducted to the inside of the flow channel, and improves the overall thermal insulation efficiency. The semi-open secondary insulation cavity releases the stress caused by thermal expansion, and the thermal resistance of the hollow structure; the design of the hollow annular sleeve has a good thermal resistance effect. The hollow structure forms a low thermal conductivity area with high thermal insulation performance. The interference fit of the first insulation ring and the second insulation ring has good sealing and thermal insulation performance.

[0013] As a further solution of the present invention, the primary insulation cavity is filled with insulation material or evacuated to form a vacuum insulation cavity. Filling with insulation material with low thermal conductivity effectively reduces the conduction of heat through the insulation cavity; evacuating to form a vacuum insulation cavity, there are no gas molecules in the vacuum for conduction and convection, which greatly reduces heat conduction, convection and radiation.

[0014] As a further solution of the present invention, the second thermal insulation ring is formed into a first step surface, a second step surface and a third step surface with a continuously increasing radius. The second step surface is flush with the outer wall of the first hole step of the large gear and is provided with a limit flange. A limit pad is provided on the sealing surface of the limit flange. A bolt hole corresponding to the shape and position of the bolt hole of the limit flange is provided on the second step surface, and a bolt is fastened in the bolt hole; a thrust cylindrical roller bearing is provided between the outer wall of the first hole step of the large gear and the third step surface. The radii of different steps of the thermal insulation ring are gradually increased to achieve a close fit between the components. By effectively sharing the local stress on the thermal insulation ring, the thermal insulation ring is supported to reduce deformation caused by thermal expansion and pressure. The surface area of ​​the thermal insulation is increased to improve the thermal isolation effect. The stress is gradually dispersed during thermal expansion and contraction to avoid local thermal stress concentration caused by temperature difference changes.

[0015] As a further solution of the present invention, the driving motor is provided with a motor seat, which includes two motor seat plates arranged parallel to each other, and the bottom end of the motor seat plate is matingly connected with the outer wall of the joint main pipe.

[0016] The beneficial effects of the present invention are:

[0017] The present invention provides an automatic clamping quick connector for a crane pipe, comprising a connector main pipe of a quick connector, wherein one end of the connector main pipe is provided with a tank truck flange docking surface, and the other end is provided with a vertical pipe flange docking surface, a driving device is provided on the side close to the vertical pipe flange, and a claw assembly is provided on the side close to the tank truck flange, wherein the driving device comprises a driving motor, and a transmission screw is provided on the shaft end of the driving motor. The transmission screw is driven by the driving motor to rotate, so that the contraction and extension of the claw can be realized quickly, and the connection and disconnection process between the tank truck flange and the vertical pipe flange is more efficient. The claw assembly realizes a firm locking of the tank truck flange through the movement of the telescopic seat, and the reciprocating motion of the claw makes the joint more stable, safe and reliable. The double-stage thermal insulation effectively isolates low temperature and prevents the driving device from being frozen to death; the guide mechanism ensures that the claw assembly moves along a predetermined trajectory during the telescopic process, with precise coordination, stable telescopic and rotation, and the overall structure has good sealing performance. The entire connection process is safe and reliable through the transmission screw, which can adapt to larger loads and pressures. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is the overall structural front view of the present invention;

[0019] Figure 2 It is a top view of the overall structure of the present invention;

[0020] Figure 3 It is a side view of the overall structure of the present invention;

[0021] Figure 4 It is a partial enlarged schematic diagram of the present invention;

[0022] Figure 5It is a schematic diagram of the structure of the double-stage thermal insulation member of the present invention;

[0023] Figure 6 It is a schematic diagram of the large gear structure of the present invention.

[0024] Among them: 1-connector main pipe, 101-vertical pipe flange docking surface, 102-tank car flange docking surface, 2-double-stage thermal insulation, 201-first thermal insulation ring, 202-hollow annular sleeve, 203-second thermal insulation ring, 233-first step surface, 232-second step surface, 231-third step surface, 3-limiting flange, 301-bolt, 302-limiting pad, 4-telescopic seat, 401-telescopic cylinder, 402-mounting seat, 403-countersunk hole, 404-butterfly spring, 5-guide mechanism, 501-guide ring column, 502-limiting hole, 503-guide plate, 531-insulation hole, 504-straight-through pressure injection oil cup, 6-claw assembly, 601-hook body, 602-claw shaft, 603-S-type guide groove, 604-limiting column, 7-driving device, 701-driving motor, 702-small gear, 703-large gear, 731-first hole step, 732-second hole step, 8-limiting pin, 9-first insulation cavity, 10-second insulation cavity, 11-thrust cylindrical roller bearing. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0026] The serial numbers of the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. are based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0027] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0028] Example 1

[0029] like Figure 1 As shown, a crane pipe automatic clamping quick connector, all parts of the quick connector are subjected to secondary cryogenic treatment. It includes a joint main pipe 1 of a quick connector, one end of which is provided with a tank truck flange docking surface 102, which is sealed with the tank truck flange sealing surface, and the other end is provided with a vertical pipe flange docking surface 101, which is sealed with the vertical pipe flange sealing surface, and a driving device 7 is provided near the vertical pipe flange. The driving device includes a driving motor 701, and the driving motor 701 is provided with a motor seat, and the motor seat includes two motor seat plates arranged parallel to each other, and the bottom end of the motor seat plate is docked with the outer wall of the joint main pipe. The driving motor is stably fixed on the outer wall of the joint main pipe. A transmission screw tooth is provided at the shaft end of the driving motor, and the transmission screw tooth is driven to rotate by the driving motor. The transmission screw gear includes a large gear 703 and a small gear 702 that are meshed with each other. The small gear is connected to the shaft end of the driving motor. The large gear is sleeved on the joint main pipe. The inner wall of the large gear wheel body includes a first hole step 731 and a second hole step 732. The diameter of the first hole step is smaller than the diameter of the second hole step. The first hole step is tightly sleeved on the outer wall of the two-stage thermal insulation component. There is no relative movement between the two-stage thermal insulation component and the large gear wheel body. An internal thread is provided on the inner wall of the second hole step.

[0030] A telescopic seat 4 is provided on one side of the large gear close to the tank car flange, and the claw assembly is installed on the telescopic seat. The telescopic seat drives the claw assembly to perform reciprocating telescopic motion along the axial direction.

[0031] The telescopic seat 4 includes a telescopic cylinder 401, the outer wall of the telescopic cylinder is provided with an external thread, and the telescopic cylinder is matched with the second hole step thread.

[0032] A mounting seat 402 is provided on one side of the telescopic cylinder, and the mounting seat 402 includes three mounting ears evenly distributed along the circumferential direction. Each mounting ear is provided with a countersunk hole 403, and the claw shaft is arranged through the countersunk hole. A butterfly spring 404 is provided in the countersunk groove of the countersunk hole and is sleeved on the claw shaft. The position of the butterfly spring is limited by the limit column.

[0033] A claw assembly 6 is provided near the side of the tank car flange, and the claw assembly includes three L-shaped claw bodies evenly distributed in a Y-shaped arrangement along the circumference. The three L-shaped claw bodies arranged in the Y-shaped arrangement are evenly stressed and clamped in a balanced manner. The L-shaped claw body includes a claw shaft 602 and a hook body 601 vertically arranged with the claw shaft. The hook body is threadedly matched with the claw shaft. One end of the hook body is provided with a chamfer on the free end face of the hook body to reduce the smooth fit between the claw and the tank car flange during the contact process. The surfaces of the three claw shafts are all provided with S-shaped guide grooves 603, which cooperate with the guide mechanism, and a limit column 604 is provided at the tail end of the claw shaft.

[0034] A guide mechanism 5 is provided between the telescopic seat and the tank truck flange, and the guide mechanism 5 drives the claw assembly to rotate in the circumferential direction. The guide mechanism 5 includes a guide ring column 501 respectively matched with the three claw shaft sleeves, and a limit hole 502 arranged in the radial direction is provided on the side wall of the guide ring column. A limit pin 8 is provided in the limit hole. After the limit pin is inserted into the S-shaped guide groove 603, the claw shaft performs circumferential rotation as the limit pin slides in the S-shaped guide groove 603, and the hook body rotates synchronously to avoid the outer contour of the tank truck flange. The large gear rotates, driving the three L-shaped claw bodies to rotate synchronously in one direction, and the claw shafts of the three L-shaped claw bodies perform extension movement. The three L-shaped claw bodies extend to the rear of the tank truck flange, and the large gear rotates in the opposite direction, driving the three L-shaped claw bodies to rotate synchronously in the opposite direction, and the claw shafts of the three L-shaped claw bodies perform retraction movement. The tank truck flange and the sealing surface of the joint main pipe are constantly approaching each other until they are sealed and matched with each other, completing the rapid sealing docking of the tank truck flange and the vertical pipe flange.

[0035] Example 2

[0036] A cryogenic liquid flows in the flow channel, and the cryogenic liquid transfers the low temperature to the clamping jaw assembly and other components. The clamping jaw assembly and related components are frozen to death, and the S-shaped guide groove fails due to freezing.

[0037] In order to prevent the quick joint from failing due to freezing, a two-stage heat insulation component 2 is provided between the external large gear and the joint main pipe, and the two-stage heat insulation component 2 includes a hollow annular sleeve 202, and the first heat insulation ring 201 and the second heat insulation ring 203 are provided at both ends of the hollow annular sleeve, respectively. The inner rings of the first heat insulation ring and the second heat insulation ring are interference fit with the outer wall of the joint main pipe, and the closed cavity surrounded by the joint main pipe and the hollow annular sleeve and the first heat insulation ring and the second heat insulation ring at both ends is set as a primary heat insulation cavity 9; the primary heat insulation cavity is filled with heat insulation material or evacuated to form a vacuum heat insulation cavity. The conduction of heat through the heat insulation cavity is effectively reduced by filling with heat insulation materials with low thermal conductivity; filling with heat insulation materials such as glass wool, ceramic fiber, and asbestos. When the primary heat insulation cavity is evacuated to form a vacuum heat insulation cavity, the vacuum state greatly prevents the transfer of heat.

[0038] The first outer ring of the heat-insulating ring and the second outer ring of the heat-insulating ring are interference-fitted with the inner tube of the telescopic tube, and the semi-open cavity surrounded by the telescopic tube and the hollow annular sleeve and the first and second heat-insulating rings at both ends is set as the secondary heat-insulating cavity 10. The cryogenic liquid in the joint main pipe is thermally isolated through the primary heat-insulating cavity and the secondary heat-insulating cavity in turn, and the low temperature in the joint main pipe is minimally transmitted to the external components.

[0039] The second heat-insulating ring 203 is formed into a first step surface 233, a second step surface 232 and a third step surface 231 with a continuously increasing radius. The second step surface is flush with the outer wall of the first hole step of the large gear and is provided with a limit flange 3. A limit pad 302 is provided on the sealing surface of the limit flange. A bolt hole corresponding to the shape and position of the bolt hole of the limit flange is provided on the second step surface, and a bolt 301 is provided in the bolt hole for fastening; a limit pad is provided between the limit flange and the second hole step, and the sealing setting is fastened by bolts. A thrust cylindrical roller bearing 11 is provided between the outer wall of the first hole step of the large gear and the third step surface. The thrust cylindrical roller bearing bears the axial force generated during the transmission process.

[0040] The guide ring column is symmetrically provided with guide plates 503 on both sides, one end of the guide plate is tangent to the outer wall of the guide ring column and is fixedly arranged, and the other end of the guide plate is fixedly arranged on the outer wall of the joint main pipe, and the guide plate is provided with a heat insulation hole 531, and the guide ring column body is provided with a straight-through pressure injection oil cup 504. The straight-through pressure injection oil cup injects lubricating oil into the guide ring column to play a lubricating role. The guide plate supports the guide ring column, so that the guide ring column is firmly fixed, and the guide plate is provided with a heat insulation hole, which reduces the heat transfer area, prevents the rapid transfer of heat, and prevents the cold source from being transferred to the claw.

[0041] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0042] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A crane pipe automatic clamping quick connector, characterized in that: The invention comprises a joint main pipe (1) of a quick joint, wherein one end of the joint main pipe is provided with a tank truck flange docking surface (102), and the other end is provided with a vertical pipe flange docking surface (101), a driving device (7) is provided on the side close to the vertical pipe flange, and a claw assembly (6) is provided on the side close to the tank truck flange, the driving device (7) comprises a driving motor (701), a transmission screw tooth is provided on the shaft end of the driving motor, the transmission screw tooth comprises a large gear (703) and a small gear (702) meshing with each other, the small gear is connected to the shaft end of the driving motor, the large gear is sleeved on the joint main pipe, a telescopic seat (4) is provided on the side of the large gear close to the tank truck flange, the claw assembly is installed on the telescopic seat, the telescopic seat drives the claw assembly to perform reciprocating telescopic motion along the axial direction, a double-stage heat insulating member (2) is provided between the large gear and the joint main pipe, a guide mechanism (5) is provided between the telescopic seat and the tank truck flange, and the guide mechanism drives the claw assembly (6) to rotate along the circumferential direction.

2. The automatic clamping quick connector for crane pipe according to claim 1 is characterized in that: The claw assembly (6) comprises three L-shaped claw bodies evenly distributed in a Y-shape along the circumferential direction, the L-shaped claw body comprising a claw shaft (602) and a hook body (601) vertically arranged with the claw shaft, the hook body and the claw shaft are threadedly matched, one end of the hook body is provided with a chamfer on the free end face of the hook body, the surfaces of the three claw shafts are all provided with S-shaped guide grooves (603), the S-shaped guide grooves are matched with the guide mechanism, and a limit column (604) is provided at the tail end of the claw shaft.

3. The automatic clamping quick connector for crane pipe according to claim 2 is characterized in that: The inner wall of the wheel body of the large gear (703) comprises a first hole step (731) and a second hole step (732), the diameter of the first hole step is smaller than the diameter of the second hole step, the first hole step is tightly sleeved with the outer wall of the double-stage thermal insulation component, the inner wall of the second hole step is provided with an internal thread, the telescopic seat comprises a telescopic cylinder (401), a mounting seat (402) is provided on one side of the telescopic cylinder, the outer wall of the telescopic cylinder is provided with an external thread, and the telescopic cylinder and the second hole step thread cooperate.

4. The automatic clamping quick connector for crane pipe according to claim 3 is characterized in that: The mounting seat (402) includes three mounting ears evenly distributed along the circumferential direction, each mounting ear is provided with a countersunk hole (403), the claw shaft is arranged through the countersunk hole, and a butterfly spring (404) sleeved on the claw shaft is provided in the countersunk groove of the countersunk hole, and the position of the butterfly spring is limited by a limiting column.

5. The automatic clamping quick connector for crane pipe according to claim 3 is characterized in that: The guide mechanism (5) comprises a guide ring column (501) respectively matched with the three claw shaft sleeves, and a limit hole (502) arranged along the radial direction is provided on the side wall of the guide ring column. A limit pin (8) is provided in the limit hole. After the limit pin is inserted into the S-shaped guide groove (603), it slides and cooperates with the claw shaft to make a circumferential rotational motion as the limit pin slides in the S-shaped guide groove (603).

6. The automatic clamping quick connector for crane pipe according to claim 4, characterized in that: Guide plates (503) are symmetrically arranged on both sides of the guide ring column, one end of the guide plate is tangent to the outer wall of the guide ring column and is fixedly arranged, and the other end of the guide plate is fixedly arranged on the outer wall of the joint main pipe, and a heat insulation hole (531) is arranged on the guide plate, and a straight-through pressure injection oil cup (504) is arranged on the guide ring column body.

7. The automatic clamping quick connector for crane pipe according to claim 6, characterized in that: The double-stage heat-insulating component (2) comprises a hollow annular sleeve (202), a first heat-insulating ring (201) and a second heat-insulating ring (203) are respectively provided at two ends of the hollow annular sleeve, the inner rings of the first heat-insulating ring and the second heat-insulating ring are interference-fitted with the outer wall of the joint main pipe, and the closed cavity enclosed by the joint main pipe and the hollow annular sleeve and the first heat-insulating ring and the second heat-insulating ring at the two ends is set as a primary heat-insulating cavity (9); The first outer heat-insulating ring and the second outer heat-insulating ring are interference-fitted with the inner tube of the telescopic tube, and the semi-open cavity enclosed by the telescopic tube and the hollow annular sleeve as well as the first and second heat-insulating rings at both ends is set as a secondary heat-insulating cavity (10).

8. The automatic clamping quick connector for crane pipe according to claim 7, characterized in that: The primary heat-insulating cavity (9) is filled with heat-insulating material or evacuated to form a vacuum heat-insulating cavity.

9. The automatic clamping quick connector for crane pipe according to claim 8, characterized in that: The second heat-insulating ring (203) is formed into a first step surface (233), a second step surface (232) and a third step surface (231) with a radius that continuously increases; the second step surface is flush with the outer wall of the first hole step of the large gear and is provided with a limit flange (3); a limit pad (302) is provided on the sealing surface of the limit flange; a bolt hole corresponding to the shape and position of the bolt hole of the limit flange is provided on the second step surface; a bolt (301) is provided in the bolt hole for fastening; and a thrust cylindrical roller bearing (11) is provided between the outer wall of the first hole step of the large gear and the third step surface.

10. The automatic clamping quick connector for crane pipe according to claim 1, characterized in that: The driving motor (701) is provided with a motor seat, which comprises two motor seat plates arranged parallel to each other, and the bottom end of the motor seat plate is butted with the outer wall of the joint main pipe.

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