A crane pipe sealing device

Abstract

The present invention discloses a crane pipe sealing device, which solves the problem that the sealing gasket is easily damaged by friction when the movable pipe and the fixed pipe move relative to each other, thereby affecting the sealing effect. The device comprises a fixing sleeve, wherein a compression sealing unit is arranged in the fixing sleeve, and the fixing sleeve is installed on the outer arm of the crane pipe. The compression sealing unit comprises an internal cavity opened in the fixing sleeve, and two semi-ring sealing gaskets are symmetrically installed in the fixing sleeve inside the internal cavity, and the outer wall of the semi-ring sealing gasket is in close contact with the inner wall of the internal cavity; in the present invention, during operation, the fixing sleeve is arranged on the outer side of the movable pipe, and when the fixing sleeve is clamped and fixed to the fixed pipe, a sealing ring is arranged between the fixing sleeve and the fixed pipe, and semi-ring sealing gaskets are symmetrically arranged in the internal cavity, and the two semi-ring sealing gaskets are close to each other, so that the semi-ring sealing gaskets are in close contact with the outer wall of the movable pipe, which is convenient for compressing and fixing the movable pipe, and avoids wear of the semi-ring sealing gaskets during movement.

Description

Technical Field

[0001] The invention belongs to the technical field of crane pipe sealing, and in particular relates to a crane pipe sealing device. Background Art

[0002] The telescopic arm of a crane is generally composed of multiple nested pipes that can slide against each other to achieve the telescopic function. The surface of the pipes is usually finely processed to reduce friction. For example, the telescopic part of the outer arm is composed of two layers of metal pipes, the inner and outer layers. The movable pipe can slide inside the fixed pipe, and there is a sealing device at the connection to prevent medium leakage. The sealing device is generally set as a gasket, but there are the following defects during use:

[0003] When the movable tube and the fixed tube move relative to each other, the sealing gasket is easily damaged by friction, thereby affecting the sealing effect of the equipment. At the same time, when a sealing gasket is provided, it is easy to cause difficulty in moving the movable tube, affecting the expansion and contraction. Summary of the Invention

[0004] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a crane pipe sealing device, which effectively solves the problem that the sealing gasket is easily damaged by friction when the movable pipe and the fixed pipe move relative to each other, thereby affecting the sealing effect.

[0005] To achieve the above object, the present invention provides the following technical solution: a crane pipe sealing device, comprising a fixed sleeve, wherein a compression sealing unit is provided in the fixed sleeve, and the fixed sleeve is installed on the crane pipe outer arm;

[0006] The compression sealing unit includes an internal cavity opened inside the fixed sleeve, two semi-ring sealing gaskets are symmetrically installed inside the fixed sleeve, the outer wall of the semi-ring sealing gasket is in close contact with the inner wall of the internal cavity, two connecting pipes are symmetrically installed on both sides of the fixed sleeve, two side boxes are symmetrically arranged on both sides of the fixed sleeve, the inner cavity of the side box is connected with the two connecting pipes, side plates are movably installed inside the side boxes, connecting rods are symmetrically installed between the side plates and the semi-ring sealing gaskets, the connecting rods pass through the connecting pipes, connecting compression units are installed at the upper and lower ends of the semi-ring sealing gaskets, and an installation drive unit is installed on the outside of the fixed sleeve.

[0007] Preferably, a return spring is installed on the side of the two semi-ring sealing gaskets away from each other, one end of the return spring is fixedly connected to the inner wall of the internal cavity, and two pressure blocks are symmetrically installed on the side of the side plate away from the semi-ring sealing gasket, and a pressure inclined surface is provided on the end of the two pressure blocks away from each other.

[0008] Preferably, the crane tube outer arm includes a fixed tube and a movable tube, the movable tube is movably installed on the inner side of the fixed tube, a positioning connection assembly is installed on the fixed tube, a fixed sleeve is installed on one end of the fixed tube, and the fixed sleeve is arranged on the outer side of the movable tube.

[0009] Preferably, the positioning connection assembly includes positioning grooves opened at equal angles at the end of the fixed tube, and plate boxes are symmetrically installed on both sides of the outer wall of the fixed tube. A side tube is fixedly installed on the side of the plate box away from the fixed tube, and a clamping rod is movably installed inside the side tube. A connecting spring is installed on the end of the clamping rod away from the fixed tube, and the connecting spring is fixedly connected to the inner wall of the end of the side tube. A pull rod is installed on the end of the connecting spring away from the fixed tube, and the pull rod extends to the outside of the side tube.

[0010] Preferably, a sealing ring is installed on the side of the fixing sleeve close to the fixed tube, a positioning rod is installed at an equal angle on the side of the fixing sleeve close to the fixed tube, the positioning rod is inserted into the interior of the positioning groove, and an inserting plate is symmetrically installed on the side of the fixing sleeve close to the fixed tube, the two inserting plates are respectively inserted into the interior of the two board boxes, and a clamping groove is opened on the side of the two inserting plates away from each other, and the clamping rod is clamped into the interior of the clamping groove.

[0011] Preferably, the connecting and clamping unit includes end grooves symmetrically opened at both ends of the semi-ring sealing gasket, the end grooves extend to the outside of the semi-ring sealing gasket, a sliding groove is opened on the inner wall of the end groove, a pressing plate is installed inside the end groove, and in the two end grooves at the same end of the two semi-ring sealing gaskets, a pressing plate is provided on the side where the two pressing plates are close to each other, and a compression spring is symmetrically installed between the pressing plate and the pressing plate.

[0012] Preferably, an inclined plate is installed at one end of the pressure plate away from the inner side of the semi-ring sealing gasket, and the end of the inclined plate away from the pressure plate is inclined toward the clamping plate, and the clamping plate and the inclined plate are both slidably connected to the slide groove.

[0013] Preferably, the installation drive unit includes a fixed box symmetrically installed at the top and bottom ends of the fixed sleeve, side grooves are symmetrically provided on both sides of the fixed box, a movable plate is slidably installed inside the fixed box, a card plate is symmetrically installed on one side of the movable plate close to the inner cavity of the fixed sleeve, a first extrusion slope is provided on the end of the card plate, side rods are symmetrically installed on both sides of the movable plate, the side rods are slidably connected to the side grooves, push plates are fixedly installed on the ends of the side rods, a second extrusion slope is provided on the end of the push plate, plate grooves are symmetrically provided at the upper and lower ends of the side box, and the two push plates on the same side pass through the two plate grooves respectively and enter the interior of the side box.

[0014] Preferably, a rotating shaft is rotatably installed on one side of one of the side boxes, a gear is fixedly installed on one end of the rotating shaft located inside the side box, a limiting plate is installed on the other end of the rotating shaft, a turning handle is installed on the limiting plate, racks are meshed and connected on both sides of the gear, the two racks are fixedly connected to the two push plates respectively, and a snap-on fixing unit is provided on the outer side of the limiting plate.

[0015] Preferably, the clamping and fixing unit includes a clamping groove opened on the circumferential outer wall of the limiting plate, a fixing box is provided above the limiting plate, the fixing box is fixedly installed on the side box, a clamping rod is slidably installed inside the fixing box, a compression spring is installed on the top end of the clamping rod, the top end of the compression spring is fixedly connected to the inner top wall of the fixing box, a connecting groove is opened on the side of the fixing box away from the side box, a pull plate is installed on the clamping rod, and the pull plate is slidably connected to the connecting groove.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1) During operation, when the fixed sleeve is arranged on the outside of the movable tube and the fixed sleeve is clamped and fixed with the fixed tube, a sealing ring is arranged between the fixed sleeve and the fixed tube, and semi-ring sealing gaskets are symmetrically arranged in the internal cavity. The semi-ring sealing gaskets are in close contact with the internal cavity. When the two push plates in the side box approach each other, they can drive the two semi-ring sealing gaskets to approach each other, so that the semi-ring sealing gaskets are in close contact with the outer wall of the movable tube, making it convenient to press and fix the movable tube and avoid wear of the semi-ring sealing gaskets during movement;

[0018] 2) During operation, when the two half-ring sealing gaskets are close to each other, the ends of the two half-ring sealing gaskets are tightly attached to form a complete annular sealing gasket, which is convenient for sealing the fixed tube and the movable tube. At the same time, the push plate moves to drive the two clamping plates on the movable plate to be respectively inserted into the two end grooves at the same end of the two half-ring sealing gaskets, thereby further clamping and fixing the two half-ring sealing gaskets. At the same time, the pressing plate is pushed toward the pressing plate. Under the elastic force of the compression spring, the ends of the two half-ring sealing gaskets are further tightly attached, thereby improving the sealing effect.

[0019] 3) During operation, when the gear rotates half a circle, the rack drives the two push plates closer to each other, thereby pushing the two half-ring gaskets closer to each other, and pressing and sealing the movable tube. After the gear continues to rotate half a circle, the card plate is driven to be clamped into the end groove for further fixation, so that the two half-ring gaskets are close to each other and the card connection is carried out in two steps, which is convenient for installation. At the same time, the installation is completed when the gear rotates one circle, so that the card rod can be clamped into the card slot in both states, which is convenient for fixation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0021] In the attached figure:

[0022] Figure 1 This is a structural schematic diagram of a crane pipe sealing device of the present invention;

[0023] Figure 2This is a schematic diagram of the fixed tube and movable tube structures of the present invention;

[0024] Figure 3 This is a schematic structural diagram of the sealing and fixing assembly of the present invention;

[0025] Figure 4 This is a schematic structural diagram of the compression sealing unit of the present invention;

[0026] Figure 5 This is a schematic diagram of the structure of a semi-ring sealing gasket of the present invention;

[0027] Figure 6 This is a structural schematic diagram of the connection and compression unit of the present invention;

[0028] Figure 7 This is a schematic diagram of the structure of the installation drive unit of the present invention;

[0029] Figure 8 Schematic diagram of the gear structure of the present invention.

[0030] In the figure: 1. fixed tube; 2. movable tube; 301. fixed sleeve; 302. sealing ring; 303. positioning rod; 304. inserting plate; 305. snap-fitting groove; 306. pressing sealing unit; 3061. inner cavity; 3062. connecting tube; 3063. side box; 3064. semi-ring sealing gasket; 3065. return spring; 3066. connecting rod; 3067. side plate; 3068. pressure block; 3069. pressure inclined surface; 307. connecting pressing unit; 3071. end groove; 3072. slide groove; 3073. pressing plate; 3074. pressing plate; 3075. inclined plate; 3076. compression spring; 308. installing driving unit; 3081. fixed box; 3 082. Side groove; 3083. Movable plate; 3084. Clamping plate; 3085. First extrusion slope; 3086. Side rod; 3087. Plate groove; 3088. Push plate; 3089. Second extrusion slope; 30810. Rack; 30811. Gear; 30812. Rotating shaft; 30813. Limiting plate; 30814. Turning handle; 309. Snap-fit ​​fixing unit; 3091. Clamping groove; 3092. Fixing box; 3093. Clamping rod; 3094. Compression spring; 3095. Connecting groove; 3096. Pull plate; 4. Positioning connection assembly; 401. Positioning groove; 402. Plate box; 403. Side tube; 404. Clamping rod; 405. Connecting spring; 406. Pull rod. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0032] Depend on Figure 1-8 The present invention relates to a crane pipe sealing device, comprising a fixing sleeve 301, on which a compression sealing unit 306 is provided, and the fixing sleeve 301 is mounted on an outer arm of the crane pipe;

[0033] The compression sealing unit 306 includes an internal cavity 3061 opened inside the fixed sleeve 301, and two semi-ring sealing gaskets 3064 are symmetrically installed inside the fixed sleeve 301. The outer wall of the semi-ring sealing gasket 3064 is in close contact with the inner wall of the internal cavity 3061. Two connecting pipes 3062 are symmetrically installed on both sides of the fixed sleeve 301. Two side boxes 3063 are symmetrically arranged on both sides of the fixed sleeve 301. The inner cavity of the side box 3063 is connected to the two connecting pipes 3062. A side plate 3067 is movably installed inside the side box 3063. The side plate 3067 is in close contact with the semi-ring sealing gasket 306. 4 are symmetrically installed with connecting rods 3066, which pass through the connecting pipe 3062. Connecting and pressing units 307 are installed at the upper and lower ends of the semi-ring sealing gasket 3064. A mounting drive unit 308 is installed on the outer side of the fixing sleeve 301. Reset springs 3065 are installed on the sides of the two semi-ring sealing gaskets 3064 away from each other. One end of the reset spring 3065 is fixedly connected to the inner wall of the internal cavity 3061. Two pressure blocks 3068 are symmetrically installed on the side of the side plate 3067 away from the semi-ring sealing gasket 3064. The ends of the two pressure blocks 3068 away from each other are each provided with a pressure inclined surface 3069.

[0034] The outer arm of the crane tube includes a fixed tube 1 and a movable tube 2. The movable tube 2 is movably installed on the inner side of the fixed tube 1. A positioning connection component 4 is installed on the fixed tube 1. The fixed sleeve 301 is installed at one end of the fixed tube 1, and the fixed sleeve 301 is sleeved on the outside of the movable tube 2. The positioning connection component 4 includes a positioning groove 401 opened at an equal angle at the end of the fixed tube 1. Plate boxes 402 are symmetrically installed on both sides of the outer wall of the fixed tube 1. A side tube 403 is fixedly installed on the side of the plate box 402 away from the fixed tube 1. A clamping rod 404 is movably installed inside the side tube 403. A connecting spring 405 is installed at the end of the connecting rod 404 away from the fixed tube 1. The connecting spring 405 is fixedly connected to the inner wall of the end of the side tube 403. A pull rod 406 is installed at the end of the connecting spring 405 away from the fixed tube 1. The pull rod 406 passes through the outside of the side tube 403.

[0035] A sealing ring 302 is installed on the side of the fixing sleeve 301 close to the fixed tube 1, and a positioning rod 303 is installed at an equal angle on the side of the fixing sleeve 301 close to the fixed tube 1. The positioning rod 303 is inserted into the interior of the positioning groove 401, and plug plates 304 are symmetrically installed on the side of the fixing sleeve 301 close to the fixed tube 1. The two plug plates 304 are respectively inserted into the interior of the two board boxes 402, and the two plug plates 304 are provided with a clamping groove 305 on the side away from each other, and the clamping rod 404 is clamped into the interior of the clamping groove 305.

[0036] The connecting and clamping unit 307 includes end grooves 3071 symmetrically opened at both ends of the semi-ring sealing gasket 3064, the end grooves 3071 penetrate to the outer side of the semi-ring sealing gasket 3064, and a sliding groove 3072 is opened on the inner wall of the end groove 3071, and a pressing plate 3074 is installed inside the end groove 3071. In the two end grooves 3071 at the same end of the two semi-ring sealing gaskets 3064, a pressing plate 3073 is provided on the side where the two pressing plates 3074 are close to each other, and a compression spring 3076 is symmetrically installed between the pressing plate 3073 and the pressing plate 3074. An inclined plate 3075 is installed on the end of the pressing plate 3074 away from the inner side of the semi-ring sealing gasket 3064, and the end of the inclined plate 3075 away from the pressing plate 3074 is inclined toward the side of the pressing plate 3073, and the pressing plate 3073 and the inclined plate 3075 are both slidably connected with the sliding groove 3072.

[0037] The installation drive unit 308 includes a fixed box 3081 symmetrically installed at the top and bottom of the fixed sleeve 301, and side grooves 3082 are symmetrically opened on both sides of the fixed box 3081. A movable plate 3083 is slidably installed inside the fixed box 3081. A clamping plate 3084 is symmetrically installed on one side of the movable plate 3083 close to the inner cavity of the fixed sleeve 301. A first extrusion slope 3085 is opened at the end of the clamping plate 3084. After the two semi-ring sealing gaskets 3064 are close to each other, the ends of the two semi-ring sealing gaskets 3064 are tightly attached to form a complete annular sealing gasket, which is convenient for sealing the fixed tube 1 and the movable tube 2. At the same time, the push plate 3088 moves to drive the movable plate 3083 up. The two clamping plates 3084 are respectively inserted into the two end grooves 3071 at the same end of the two semi-ring sealing gaskets 3064, thereby further clamping and fixing the two semi-ring sealing gaskets 3064, and at the same time pushing the pressing plate 3074 to move toward the pressing plate 3073. Under the elastic force of the compression spring 3076, the ends of the two semi-ring sealing gaskets 3064 are further pressed together, thereby improving the sealing effect. Side rods 3086 are symmetrically installed on both sides of the movable plate 3083. The side rods 3086 are slidably connected to the side grooves 3082. The ends of the side rods 3086 are fixedly installed with push plates 3088. The ends of the push plates 3088 are provided with a second extrusion slope 3089. The sleeve 301 is sleeved on the outside of the movable tube 2, and when the fixed sleeve 301 is clamped and fixed with the fixed tube 1, a sealing ring 302 is provided between the fixed sleeve 301 and the fixed tube 1, and a semi-ring sealing gasket 3064 is symmetrically provided in the internal cavity 3061. The semi-ring sealing gasket 3064 is tightly attached to the internal cavity 3061. When the two push plates 3088 in the side box 3063 are close to each other, the two semi-ring sealing gaskets 3064 can be driven to approach each other, so that the semi-ring sealing gasket 3064 is tightly attached to the outer wall of the movable tube 2, which is convenient for pressing and fixing the movable tube 2 and sealing between the fixed tube 1 and the movable tube 2. The upper and lower ends of the side box 3063 are symmetrically provided with plate grooves 3 087, the two push plates 3088 on the same side pass through the two plate slots 3087 respectively and enter the inside of the side box 3063, one side of one of the side boxes 3063 is rotatably installed with a rotating shaft 30812, and the rotating shaft 30812 is located in the side box 3063. One end of the rotating shaft 30812 is fixedly installed with a gear 30811, and the other end of the rotating shaft 30812 is installed with a limiting plate 30813, and a turning handle 30814 is installed on the limiting plate 30813. Racks 30810 are meshed and connected on both sides of the gear 30811, and the two racks 30810 are fixedly connected to the two push plates 3088 respectively, and a snap-on fixing unit 309 is provided on the outer side of the limiting plate 30813.

[0038] The clamping fixing unit 309 includes a clamping groove 3091 provided on the circumferential outer wall of the limiting plate 30813, a fixing box 3092 is provided above the limiting plate 30813, the fixing box 3092 is fixedly installed on the side box 3063, a clamping rod 3093 is slidably installed inside the fixing box 3092, a compression spring 3094 is installed on the top of the clamping rod 3093, the top of the compression spring 3094 is fixedly connected to the inner top wall of the fixing box 3092, a connecting groove 3095 is provided on the side of the fixing box 3092 away from the side box 3063, a pull plate 3096 is installed on the clamping rod 3093, and the pull plate 3096 is connected to the connecting groove 3095. 095 sliding connection, when the gear 30811 rotates half a circle, the two push plates 3088 are driven to approach each other through the rack 30810, thereby pushing the two half-ring sealing gaskets 3064 to approach each other, and the movable tube 2 is compressed and sealed. After the gear 30811 continues to rotate half a circle, it drives the clamping plate 3084 to be clamped into the end groove 3071 for further fixation, so that the two half-ring sealing gaskets 3064 are close to each other and the clamping connection is carried out in two steps, which is convenient for installation. At the same time, the installation is completed when the gear 30811 rotates one circle, so that the clamping rod 3093 can be clamped into the clamping groove 3091 in both states, which is convenient for fixation.

[0039] Working principle: When working, first, the fixing sleeve 301 is placed on the outer side of the movable tube 2 of the crane tube outer arm, the positioning rod 303 is inserted into the positioning groove 401 at the end of the fixed tube 1, and the plug-in plate 304 is inserted into the plate box 402. The fixing sleeve 301 and the fixed tube 1 are clamped and fixed by the pull rod 406 and the clamping groove 305. At this time, the sealing ring 302 between the fixing sleeve 301 and the fixed tube 1 is compressed to form a seal;

[0040] In the original state, the two semi-ring sealing gaskets 3064 are not in contact with the outer wall of the movable tube 2. At this time, the clamping rod 3093 is clamped with the clamping groove 3091. At this time, the movable tube 2 can be extended and retracted along the inner side of the fixed tube 1 to adjust its position. When the length of the crane tube outer arm reaches the required length, the staff pulls the clamping rod 3093 upward through the pull plate 3096, so that the clamping rod 3093 is disengaged from the clamping groove 3091. Then, the gear 30811 is rotated by turning the handle 30814. Since the gear 30811 is connected to the two racks 3 0810 meshes with each other, thereby driving the two push plates 3088 inside the side box 3063 to move closer to each other. During the process of the gear 30811 rotating half a circle, the push plate 3088 generates pressure on the pressure inclined surface 3069 of the pressure block 3068 through the second extrusion inclined surface 3089, thereby pushing the semi-annular sealing gasket 3064 toward the side of the movable tube 2, so that the two semi-annular sealing gaskets 3064 are pressed against the outer wall of the movable tube 2, and the two semi-annular sealing gaskets 3064 are combined into a complete annular sealing gasket;

[0041] When the plate groove 3087 moves, the movable plate 3083 is driven to move toward the side of the movable tube 2. After the gear 30811 continues to rotate half a circle, the upper and lower push plates 3088 are driven to continue to move, thereby driving the two clamping plates 3084 on the movable plate 3083 to be inserted into the two end grooves 3071 at the same end of the two semi-ring sealing gaskets 3064 respectively, and the clamping plates 3084 are inserted into the side of the inclined plate 3075 away from the clamping plate 3073, so that the first extrusion inclined surface 3085 generates pressure on the inclined plate 3075, thereby pushing the pressing plate 3074 toward the side of the clamping plate 3073, so that the compression spring 3076 is compressed. Under the elastic force of the compression spring 3076, the two ends of the two semi-ring sealing gaskets 3064 are tightly attached to each other, further improving the fixation and sealing effect of the movable tube 2.

[0042] After the gear 30811 rotates one circle, the device changes from a state of being separated from the movable tube 2 to a state of pressing and sealing the movable tube 2. After the gear 30811 rotates one circle, the clamping rod 3093 can still be clamped into the clamping groove 3091, thereby clamping and fixing the gear 30811, thereby facilitating the fixation of the positions of the semi-ring sealing gasket 3064, the movable plate 3083 and the push plate 3088, making it easy to use.

[0043] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0044] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A crane pipe sealing device, comprising a fixed sleeve (301), characterized in that: A compression sealing unit (306) is provided in the fixing sleeve (301), and the fixing sleeve (301) is mounted on the outer arm of the crane pipe; The compression sealing unit (306) includes an internal cavity (3061) opened inside the fixed sleeve (301), two semi-ring sealing gaskets (3064) are symmetrically installed inside the internal cavity (3061) and inside the fixed sleeve (301), the outer wall of the semi-ring sealing gasket (3064) is in close contact with the inner wall of the internal cavity (3061), two connecting pipes (3062) are symmetrically installed on both sides of the fixed sleeve (301), and two side boxes (3063) are symmetrically provided on both sides of the fixed sleeve (301). The inner cavity of (3063) is connected to the two connecting pipes (3062), and a side plate (3067) is movably installed inside the side box (3063). Connecting rods (3066) are symmetrically installed between the side plate (3067) and the semi-ring sealing gasket (3064). The connecting rods (3066) pass through the connecting pipe (3062). The upper and lower ends of the semi-ring sealing gasket (3064) are both installed with connecting and pressing units (307), and the outer side of the fixed sleeve (301) is installed with a mounting drive unit (308); The crane tube outer arm comprises a fixed tube (1) and a movable tube (2), the movable tube (2) is movably mounted on the inner side of the fixed tube (1), a positioning connection assembly (4) is mounted on the fixed tube (1), a fixed sleeve (301) is mounted on one end of the fixed tube (1), and the fixed sleeve (301) is sleeved on the outer side of the movable tube (2); The positioning connection assembly (4) includes a positioning groove (401) opened at an equal angle at the end of the fixed tube (1), and plate boxes (402) are symmetrically installed on both sides of the outer wall of the fixed tube (1), and a side tube (403) is fixedly installed on the side of the plate box (402) away from the fixed tube (1), and a clamping rod (404) is movably installed inside the side tube (403), and a connecting spring (405) is installed on the end of the clamping rod (404) away from the fixed tube (1), and the connecting spring (405) is fixedly connected to the inner wall of the end of the side tube (403), and a pull rod (406) is installed on the end of the connecting spring (405) away from the fixed tube (1), and the pull rod (406) passes through the outside of the side tube (403); A sealing ring (302) is installed on the side of the fixing sleeve (301) close to the fixing tube (1), a positioning rod (303) is installed at an equal angle on the side of the fixing sleeve (301) close to the fixing tube (1), the positioning rod (303) is inserted into the interior of the positioning groove (401), and plugging plates (304) are symmetrically installed on the side of the fixing sleeve (301) close to the fixing tube (1), the two plugging plates (304) are respectively inserted into the interiors of the two box boxes (402), and the two plugging plates (304) are provided with a clamping groove (305) on the side away from each other, and the clamping rod (404) is clamped into the interior of the clamping groove (305); The connecting and pressing unit (307) includes end grooves (3071) symmetrically provided at both ends of the semi-ring sealing gasket (3064), the end grooves (3071) extending to the outside of the semi-ring sealing gasket (3064), a sliding groove (3072) provided on the inner wall of the end groove (3071), a pressing plate (3074) installed inside the end groove (3071), and a pressing plate (3073) provided on the side where the two pressing plates (3074) are close to each other in the two end grooves (3071) at the same end of the two semi-ring sealing gaskets (3064), and a compression spring (3076) symmetrically provided between the pressing plate (3073) and the pressing plate (3074); An inclined plate (3075) is installed at one end of the pressing plate (3074) away from the inner side of the semi-ring sealing gasket (3064), and an end of the inclined plate (3075) away from the pressing plate (3074) is inclined toward the side of the pressing plate (3073), and the pressing plate (3073) and the inclined plate (3075) are both slidably connected to the slide groove (3072); The installation drive unit (308) comprises a fixed box (3081) symmetrically mounted on the top and bottom ends of the fixed sleeve (301), side grooves (3082) are symmetrically opened on both sides of the fixed box (3081), a movable plate (3083) is slidably installed inside the fixed box (3081), a clamping plate (3084) is symmetrically installed on one side of the movable plate (3083) close to the inner cavity of the fixed sleeve (301), a first extrusion inclined surface (3085) is opened at the end of the clamping plate (3084), and the movable plate (3083) is symmetrically mounted on the inner side of the fixed sleeve (301). 083) are symmetrically provided with side rods (3086), the side rods (3086) are slidably connected to the side grooves (3082), the ends of the side rods (3086) are fixedly provided with push plates (3088), the ends of the push plates (3088) are provided with second extrusion inclined surfaces (3089), the upper and lower ends of the side box (3063) are symmetrically provided with plate grooves (3087), and the two push plates (3088) on the same side respectively pass through the two plate grooves (3087) and enter the interior of the side box (3063); A rotating shaft (30812) is rotatably mounted on one side of one of the side boxes (3063); a gear (30811) is fixedly mounted on one end of the rotating shaft (30812) located inside the side box (3063); a limiting plate (30813) is mounted on the other end of the rotating shaft (30812); a turning handle (30814) is mounted on the limiting plate (30813); racks (30810) are meshedly connected on both sides of the gear (30811); the two racks (30810) are fixedly connected to the two push plates (3088) respectively; and a clamping fixing unit (309) is provided on the outer side of the limiting plate (30813); The clamping and fixing unit (309) includes a clamping groove (3091) provided on the circumferential outer wall of the limiting plate (30813); a fixing box (3092) is provided above the limiting plate (30813); the fixing box (3092) is fixedly installed on the side box (3063); a clamping rod (3093) is slidably installed inside the fixing box (3092); a compression spring (3094) is installed at the top end of the clamping rod (3093); the top end of the compression spring (3094) is fixedly connected to the inner top wall of the fixing box (3092); a connecting groove (3095) is provided on the side of the fixing box (3092) away from the side box (3063); a pull plate (3096) is installed on the clamping rod (3093); and the pull plate (3096) is slidably connected to the connecting groove (3095).

2. A crane pipe sealing device according to claim 1, characterized in that: A return spring (3065) is installed on the side of the two semi-ring sealing gaskets (3064) away from each other, and one end of the return spring (3065) is fixedly connected to the inner wall of the internal cavity (3061). Two pressure blocks (3068) are symmetrically installed on the side of the side plate (3067) away from the semi-ring sealing gasket (3064), and a pressure inclined surface (3069) is provided on the end of the two pressure blocks (3068) away from each other.

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