Thrust type hydraulic length adjusting device

Abstract

The embodiment of the invention provides a thrust type hydraulic length adjusting device, and relates to the technical field of hydraulic cylinders. A thrust type hydraulic length adjusting device comprises a back plate, a top frame is fixedly connected to the top of the back face of the back plate, and piston cylinders are fixedly connected to the two sides of the top frame; the front face of the back plate is fixedly connected with an outer barrel section, an inner cavity of the outer barrel section is slidably connected with an inner barrel section, the top of the inner barrel section is fixedly connected with an upper lifting lug, and the bottom of the outer barrel section is fixedly connected with a lower lifting lug. The rear side of the back plate is provided with an acting assembly used for supplying a pressurization air source and a supply assembly used for adjusting the length of the inner shell ring. The self-adaptive adjustment effect of the thrust length is achieved through the acting assembly and the supply assembly in a pneumatic and hydraulic combined mode, auxiliary supporting treatment is carried out between the lower lifting lug and the cargo connecting piece through the adjusting assembly and the supporting assembly, and rotation work of the cargo connecting piece on an inner connecting pin shaft and an outer connecting pin shaft of the lower lifting lug is not affected.

Description

Technical Field

[0001] The invention belongs to the technical field of hydraulic cylinders, and in particular relates to a thrust type hydraulic length adjusting device. Background Art

[0002] In the field of crane lifting construction in the nuclear power, petrochemical, coal chemical, metallurgical and other industries, the length adjustment of the sling is an important link. At present, the traditional tools or devices used to adjust the length of the sling mainly include basket screws and threaded adjustable pull rods. The length of the sling is adjusted by rotating the corresponding components. For example, in the prior art (publication number CN216275231U, patent name is a patent application for a sling system), the installation margin can be provided for the sling system by adjusting the screw sleeve and the adjusting rod. In the process of implementing this technical solution, it is found that there are at least the following problems in the prior art; At present, the tools or devices used to adjust the length of the sling mainly include basket screws, threaded adjustable pull rods, etc., all of which must be adjusted manually. At the same time, due to insufficient manual power, each adjustment must be made after the overall force is unloaded and then the operation is performed. After the adjustment is completed, the load force on the sling is increased. If the length adjusted once does not meet the requirements, it needs to be unloaded again, which is inefficient and labor-intensive. At the same time, it is not possible to use a combination of pneumatic and hydraulic methods to achieve the adaptive adjustment effect of the thrust length. Summary of the invention

[0003] The present application aims to at least solve the technical problem that the prior art cannot use hydraulic means to achieve the adaptive adjustment of the thrust length. To this end, the present application proposes a thrust type hydraulic length adjustment device.

[0004] To achieve the above purpose, the specific technical solutions of the present invention are as follows: A thrust type hydraulic length adjustment device comprises a back plate, a top frame is fixedly connected to the top of the back of the back plate, and piston cylinders are fixedly connected to both sides of the top frame; The front of the back plate is fixedly connected with an outer cylinder section, and the inner cavity of the outer cylinder section is slidably connected with an inner cylinder section, the top of the inner cylinder section is fixedly connected with an upper lifting ear, and the bottom of the outer cylinder section is fixedly connected with a lower lifting ear; The rear side of the back plate is provided with a working assembly for supplying a pressurized gas source and a supply assembly for adjusting the length of the inner cylinder section, and the working assembly includes a double-headed motor fixed at the center of the back side of the back plate.

[0005] Preferably: the working assembly also includes a first electric push rod embedded in an output shaft of the double-headed motor, and the piston rod of the first electric push rod is fixedly connected to the first main bevel gear, both sides of the top frame close to the piston cylinder are rotatably connected to the first sub-bevel gear used in conjunction with the first main bevel gear, and the inner cavity of the first sub-bevel gear is fixedly connected to a cam through a fixing rod, the cam is rotatably connected to a connecting rod, and the other end of the connecting rod is hinged to a piston head that slidably cooperates with the piston cylinder, the bottom of the piston cylinder is connected to a boost pipe, and the other end of the boost pipe is connected to a boost tank that is fixedly cooperated with the top frame.

[0006] Preferably: the supply assembly includes a straight pipe connected to the bottom of the booster tank, and the bottom end of the straight pipe is connected to an oil storage tank, one end of the top of the oil storage tank is connected to an oil pipe, and the top of one side of the booster tank is connected to an air pipe, the other ends of the oil pipe and the air pipe are both connected to a four-way valve, and the other end of the four-way valve is connected to a three-way pipe fixedly matched with the outer cylinder section, the top end of the three-way pipe is connected to a threaded pipe, and the top end of the threaded pipe is connected to a sealing cylinder fixedly matched with the inner cylinder section, the inner cavity of the sealing cylinder is fixedly connected to a thrust rod, and the top of the thrust rod is fixedly connected to the outer cylinder section.

[0007] Preferably, a pressure sensor is embedded in one end of the booster tank away from the gas pipeline, and a liquid level sensor is embedded in one end of the oil storage tank close to the oil pipeline.

[0008] Preferably: the front end of the four-way valve is connected to a pressure relief pipe with a pressure relief valve, and the other end of the top of the oil storage tank is connected to a refueling pipe with a one-way valve, and the rear end of the oil storage tank is connected to an oil drain pipe with a one-way valve.

[0009] Preferably, the thrust rod adopts an I-shaped structural design, and a return spring fixedly matched with the inner cylinder section is sleeved on the thrust rod and is located outside the sealing cylinder.

[0010] Preferably, the top of the thrust rod is integrally formed with outer protrusions fixedly matched with the outer cylinder section, and the inner cylinder section is provided with outer through grooves slidably matched with the outer protrusions.

[0011] Preferably, inner slide grooves are provided around the inner cavity of the sealing cylinder, and the inner cavity of the inner slide groove is slidably connected with an inner sliding block fixedly matched with the bottom of the thrust rod.

[0012] Preferably, inner slide rails are provided around the inner cavity of the outer cylinder segment, and the inner cavity of the inner slide rails is slidably connected with inner slide strips fixedly matched with the inner cylinder segment.

[0013] Preferably: the upper lifting ear and the lower lifting ear are both provided with external pin shafts, and both sides of the external pin shafts are fixedly connected with hexagonal bayonet heads, and the front side of the outer cylinder section is fixedly connected with a PLC controller with an alarm light.

[0014] The thrust type hydraulic length adjustment device of the present invention has the following advantages: 1. This thrust type hydraulic length adjustment device firstly provides a unified driving source by a double-head motor, which saves the driving power cost. After the first electric push rod adjusts the clamping stroke between the first main bevel gear and the two sets of first sub-bevel gears, the two sets of cams, connecting rods and piston heads perform reciprocating work in the two sets of piston cylinders and generate a pressurized air source. The pressurized air source generated in the two sets of piston cylinders is then centrally supplied to the pressurized tank through two pressurized pipes for temporary storage, so as to provide a pressurized air source supply for subsequent pneumatic adjustment.

[0015] 2. This kind of thrust type hydraulic length adjustment device, then, the pressurized gas source in the booster tank can be supplied into the oil storage tank through a straight pipe, the hydraulic oil in the oil storage tank is pressurized and transported, and then passes through the oil pipeline, four-way valve, three-way pipe and threaded pipe in sequence to reach the sealing cylinder. With the continuous supply of hydraulic oil and under the action of liquid pressure, the thrust rod is forced to be lifted up in the sealing cylinder, and the inner cylinder section is pushed out of the outer cylinder section, extending the overall stroke length of the outer cylinder section and the inner cylinder section, thereby realizing the adaptive adjustment effect of the stroke length under hydraulic conditions.

[0016] 3. This kind of thrust type hydraulic length adjustment device, when the hydraulic oil supply is poor or needs to be replaced, the pressurized gas source in the booster tank can directly pass through the air pipe and pass through the four-way valve, the three-way pipe and the threaded pipe to reach the sealing cylinder. With the continuous supply of the pressurized gas source and the pressure of the pressurized gas source, the thrust rod is forced to be lifted up in the sealing cylinder, and the inner cylinder section is pushed out of the outer cylinder section, extending the overall stroke length of the outer cylinder section and the inner cylinder section, thereby realizing the adaptive adjustment effect of the stroke length under pneumatic conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a structural schematic diagram of a thrust type hydraulic length adjustment device of the present invention; Figure 2 It is a rear view of the structure of a thrust type hydraulic length adjustment device of the present invention; Figure 3 It is a bottom-view cross-sectional view of a thrust-type hydraulic length adjustment device structure of the present invention; Figure 4 A top cross-sectional view of a thrust type hydraulic length adjustment device structure of the present invention; Figure 5It is a front cross-sectional view of the piston cylinder, working assembly, straight pipe and oil storage tank structure of the present invention; Figure 6 It is a bottom-up cross-sectional view of the piston cylinder, working assembly and straight-through pipe structure of the present invention; Figure 7 It is a side view of the boost pipe, boost tank and supply assembly structure of the present invention; Figure 8 It is a side view of the outer cylinder section, inner cylinder section, upper lifting lug and lower lifting lug structure of the present invention; Fig. 9 It is a partial cross-sectional exploded view of the outer cylinder section, inner cylinder section, upper lifting lug, lower lifting lug and supply assembly structure of the present invention; Fig.10 It is a partial cross-sectional exploded view of the supply assembly structure of the present invention; Fig.11 It is a front view of the double-headed motor, adjustment assembly and support assembly structure of the present invention; Fig.12 It is a side view of the double-headed motor, adjustment assembly and support assembly structure of the present invention; Fig.13 It is a partial side view of the adjustment assembly and the support assembly structure of the present invention; Fig.14 It is a partial exploded view of the adjustment component and the support component structure of the present invention.

[0019] Explanation of the markings in the figure: 1. back plate; 2. top frame; 3. piston cylinder; 4. outer cylinder section; 5. inner cylinder section; 6. upper lifting lug; 7. lower lifting lug; 8. working assembly; 81. double-headed motor; 82. first electric push rod; 83. first main bevel gear; 84. first secondary bevel gear; 85. cam; 86. connecting rod; 87. piston head; 88. booster pipe; 89. booster tank; 9. supply assembly; 91. straight pipe; 92. oil storage tank; 93. oil pipeline; 94. gas pipeline; 95. four-way valve; 96. three-way pipe; 97. threaded pipe; 98. sealing cylinder; 99. thrust rod; 10. bottom frame; 11. Adjustment assembly; 111, second electric push rod; 112, second main bevel gear; 113, second secondary bevel gear; 114, forward and reverse screws; 115, screw sleeve; 116, bent arm; 117, rotating shaft; 12, support assembly; 121, rotating head; 122, clamping head; 123, support plate; 124, threaded sleeve; 125, threaded rod; 126, rotating wheel; 127, positioning seat; 13, pressure sensor; 14, liquid level sensor; 15, pressure relief pipe; 16, reset spring; 17, external protrusion; 18, external through groove; 19, internal slide groove; 20, internal slider; 21, internal slide rail; 22, internal slide strip. DETAILED DESCRIPTION

[0020] The present invention is specifically described below in conjunction with the accompanying drawings and specific embodiments: like Figure 1-Figure 14 As shown, a thrust type hydraulic length adjustment device of the present invention comprises a back plate 1, a top frame 2 is fixedly connected to the top of the back of the back plate 1, and piston cylinders 3 are fixedly connected to both sides of the top frame 2, an outer cylinder section 4 is fixedly connected to the front of the back plate 1, and an inner cylinder section 5 is slidably connected to the inner cavity of the outer cylinder section 4, an upper lifting ear 6 is fixedly connected to the top of the inner cylinder section 5, and a lower lifting ear 7 is fixedly connected to the bottom of the outer cylinder section 4, inner slide rails 21 are provided around the inner cavity of the outer cylinder section 4, and the inner cavity of the inner slide rail 21 is slidably connected to an inner slide bar 22 fixedly matched with the inner cylinder section 5, which plays a role of sliding limit between the outer cylinder section 4 and the inner cylinder section 5, so as to prevent the inner cylinder section 5 from shaking and tilting during the telescopic adjustment in the outer cylinder section 4; The upper lifting lug 6 and the lower lifting lug 7 are both provided with external pins, which are convenient for hanging the sling and the cargo connector, and the two sides of the external pins are fixedly connected with hexagonal card pin heads, which play a role in preventing the external pins, slings and cargo connectors from falling off after hanging. The front of the outer cylinder section 4 is fixedly connected with a PLC controller with an alarm light to quickly control the electrical components; A working component 8 for supplying a pressurized air source is provided on the rear side of the back plate 1. It performs reciprocating work in the two groups of piston cylinders 3 to generate a pressurized air source, and temporarily stores the pressurized air source to provide a pressurized air source supply for subsequent pneumatic adjustment, as well as a supply component 9 for adjusting the length of the inner cylinder section 5. The working component 8 includes a double-headed motor 81 fixed at the center of the back side of the back plate 1. Under the action of hydraulic pressure, the inner cylinder section 5 is forced to push out of the outer cylinder section 4, extending the overall stroke length of the outer cylinder section 4 and the inner cylinder section 5, thereby achieving an adaptive adjustment effect of the stroke length under hydraulic conditions. Under the action of the pressurized air source pressure, the inner cylinder section 5 is forced to push out of the outer cylinder section 4, extending the overall stroke length of the outer cylinder section 4 and the inner cylinder section 5, thereby achieving an adaptive adjustment effect of the stroke length under pneumatic conditions.

[0021] like Figure 5-Figure 10As shown, the working assembly 8 also includes a first electric push rod 82 embedded in an output shaft of the double-headed motor 81, and the piston rod of the first electric push rod 82 is fixedly connected to the first main bevel gear 83, and the top frame 2 is rotatably connected to the two sides of the piston cylinder 3 with the first sub-bevel gear 84 used in conjunction with the first main bevel gear 83. First, the double-headed motor 81 provides a unified driving source to save driving power costs, and the first electric push rod 82 adjusts the clamping stroke between the first main bevel gear 83 and the two sets of first sub-bevel gears 84, and the inner cavity of the first sub-bevel gear 84 is fixed by the fixing rod A cam 85 is fixedly connected, and a connecting rod 86 is rotatably connected to the convex head of the cam 85, and the other end of the connecting rod 86 is hinged with a piston head 87 that slides with the piston cylinder 3. The two groups of cams 85, connecting rods 86 and piston heads 87 perform reciprocating work in the two groups of piston cylinders 3 and generate a pressurized air source. A boosting pipe 88 is connected to the bottom of the piston cylinder 3, and the other end of the boosting pipe 88 is connected to a boosting tank 89 that is fixedly matched with the top frame 2. The boosted air source generated in the two groups of piston cylinders 3 is then centrally supplied to the boosting tank 89 for temporary storage through two boosting pipes 88, so as to provide a boosted air source supply for subsequent pneumatic adjustment.

[0022] The supply assembly 9 includes a straight pipe 91 connected to the bottom of the boost tank 89, and the bottom end of the straight pipe 91 is connected to an oil storage tank 92 fixedly matched with the base frame 10. The pressurized gas source in the boost tank 89 can be supplied to the oil storage tank 92 through the straight pipe 91 to perform pressurized transportation on the hydraulic oil in the oil storage tank 92. One end of the top of the oil storage tank 92 is connected to an oil delivery pipe 93, and the top end of one side of the boost tank 89 is connected to an air delivery pipe 94. The other ends of the oil delivery pipe 93 and the air delivery pipe 94 are both connected to a four-way valve 95, and the other end of the four-way valve 95 is connected to a three-way pipe 96 fixedly matched with the outer cylinder section 4, the top end of the three-way pipe 96 is connected to a threaded pipe 97, and the top end of the threaded pipe 97 is connected to a sealing cylinder 98 fixedly matched with the inner cylinder section 5. The pressurized hydraulic oil in the oil storage tank 92 passes through the oil delivery pipe 93, the four-way valve 95, the three-way pipe 96 and the threaded pipe 97 in sequence to reach the sealing cylinder 98; The inner cavity of the sealing cylinder 98 is fixedly connected with a thrust rod 99, and the top of the thrust rod 99 is fixedly connected to the outer cylinder section 4. With the continuous supply of hydraulic oil and under the action of hydraulic pressure, the thrust rod 99 is forced to be pushed up in the sealing cylinder 98, and the inner cylinder section 5 is pushed out of the outer cylinder section 4, extending the overall stroke length of the outer cylinder section 4 and the inner cylinder section 5, and realizing the adaptive adjustment effect of the stroke length under hydraulic conditions; when the hydraulic oil supply is not smooth or needs to be replaced, the pressurized gas source in the booster tank 89 can directly pass through the gas pipe 94 through the four-way valve 95, the three-way pipe 96 and the threaded pipe 97 to reach the sealing cylinder 98. With the continuous supply of the pressurized gas source and under the action of the pressure of the pressurized gas source, the thrust rod 99 is forced to be pushed up in the sealing cylinder 98, and the inner cylinder section 5 is pushed out of the outer cylinder section 4, extending the overall stroke length of the outer cylinder section 4 and the inner cylinder section 5, and realizing the adaptive adjustment effect of the stroke length under pneumatic conditions; A pressure sensor 13 is embedded in one end of the boost tank 89 away from the gas pipeline 94 to monitor the pressure of the boost gas source in the boost tank 89 in real time, and a liquid level sensor 14 is embedded in one end of the oil storage tank 92 close to the oil pipeline 93 to monitor the hydraulic oil level in the oil storage tank 92 in real time so as to add liquid in time. The front end of the four-way valve 95 is connected to a pressure relief pipe 15 with a pressure relief valve to relieve the pressure of the boost gas source in the sealing cylinder 98, and the other end of the top of the oil storage tank 92 is connected to a filling pipe with a one-way valve, and the rear end of the oil storage tank 92 is connected to an oil drain pipe with a one-way valve, so as to facilitate the rapid filling and draining of the hydraulic oil in the oil storage tank 92. The thrust rod 99 adopts an I-shaped structural design, and a reset spring 16 fixedly matched with the inner cylinder section 5 is sleeved on the thrust rod 99 and located on the outside of the sealing cylinder 98, which plays an elastic buffering and elastic reset role between the thrust rod 99 and the sealing cylinder 98. The top of the thrust rod 99 is integrally formed with external protrusions 17 fixedly matched with the outer cylinder section 4, and the inner cylinder section 5 is provided with external through grooves 18 slidably matched with the external protrusions 17, which play a role of sliding support for the inner cylinder section 5 and improve the telescopic stability of the inner cylinder section 5. The inner cavity of the sealing cylinder 98 is provided with internal slide grooves 19, and the inner cavity of the inner slide groove 19 is slidably connected with an inner slider 20 fixedly matched with the bottom of the thrust rod 99, which plays a role of sliding limit between the sealing cylinder 98 and the thrust rod 99, and also prevents the thrust rod 99 from sliding and skewing in the sealing cylinder 98, and also improves the displacement stability of the thrust rod 99 in the sealing cylinder 98.

[0023] like Figure 11-Figure 14As shown, after the stroke length of the outer cylinder section 4 and the inner cylinder section 5 is adaptively adjusted, when the cargo is hoisted and connected, the lower lifting ear 7 and the cargo connecting piece cannot be supported, resulting in unstable hoisting. The bottom of the back of the back plate 1 is fixedly connected to the bottom of the bottom frame 10, and the two sides of the bottom frame 10 are respectively provided with an adjustment component 11 and a support component 12 that cooperate with the support of the lower lifting ear 7. The adjustment component 11 includes a second electric push rod 111 embedded in the other output shaft of the double-headed motor 81, and the second electric push rod The piston rod of 111 is fixedly connected to the second main bevel gear 112, and the inner cavity of the base frame 10 is rotatably connected to the forward and reverse screw rods 114, and the forward and reverse screw rods 114 are fixedly connected to the second secondary bevel gear 113 used in conjunction with the second main bevel gear 112. The second electric push rod 111 first adjusts the clamping stroke between the second main bevel gear 112 and the second secondary bevel gear 113, and then the double-headed motor 81 drives the second secondary bevel gear 113 to rotate through the second main bevel gear 112 that is clamped in place; Both sides of the forward and reverse screw rods 114 are threadedly connected with screw rod sleeves 115, and the bottom of the screw rod sleeve 115 is fixedly connected with a bent arm 116 that slides with the base frame 10, and the other side of the bent arm 116 is fixedly connected with a rotating shaft 117. The second secondary bevel gear 113 drives the forward and reverse screw rods 114 to rotate synchronously in the forward or reverse direction, and the forward and reverse screw rods 114 drive the two groups of screw rod sleeves 115 to move synchronously inward or outward. The two groups of screw rod sleeves 115 drive the two groups of rotating shafts 117 to move synchronously inward or outward through the two bent arms 116; the support assembly 12 includes a rotating head 121 that rotates in the rotating shaft 117, and the inner side of the rotating head 121 is fixedly connected with a clamping head 122 that is clamped and matched with the hexagonal clamping pin head on the external pin shaft, and the two groups of rotating shafts 117 drive the two groups The clamping head 122 is clamped onto the hexagonal clamping pin head on the external pin shaft, and the outer side of the swivel head 121 is fixedly connected with a support plate 123, and a threaded sleeve 124 is embedded at the bottom of the support plate 123, and a threaded rod 125 is connected to the inner thread of the threaded sleeve 124, and a rotating wheel 126 is fixedly connected to the outer side of the threaded rod 125, and a positioning seat 127 is fixedly connected to the inner side of the threaded rod 125. At the same time, the swivel head 121 also drives the two groups of threaded rods 125, rotating wheels 126 and positioning seats 127 on the threaded sleeves 124 to move synchronously inward through the two groups of support plates 123, and then the two groups of rotating wheels 126 drive the two groups of positioning seats 127 through the threaded rod 125 to perform auxiliary support processing between the lower lifting ear 7 and the cargo connecting piece, and does not affect the rotation of the cargo connecting piece on the inner and outer connecting pin shafts of the lower lifting ear 7.

[0024] The working principle of a thrust type hydraulic length adjustment device is as follows: first, the first electric push rod 82 is controlled to start and drive the first main bevel gear 83 to move up and get stuck in the meshing part of the two sets of first sub-bevel gears 84, then the double-headed motor 81 is controlled to start and drive the two sets of first sub-bevel gears 84 to rotate through the first main bevel gear 83 that is meshed in place, and the two sets of first sub-bevel gears 84 drive the two sets of cams 85 to rotate accordingly, and the two sets of cams 85 drive the piston heads 87 on the two connecting rods 86 to perform alternating reciprocating in the two sets of piston cylinders 3. After doing work and generating a pressurized air source in the two groups of piston cylinders 3, the pressurized air source is centrally supplied to the pressurized tank 89 through two pressurized pipes 88 for temporary storage, and the pressure sensor 13 monitors the pressure of the pressurized air source in the pressurized tank 89 in real time until the pressure sensor 13 detects that the pressure of the pressurized air source in the pressurized tank 89 reaches the maximum threshold, first controlling the double-headed motor 81 to pause, and then controlling the first electric push rod 82 to close and drive the first main bevel gear 83 to move downward and disengage from the meshing portion of the two groups of first sub-bevel gears 84 to the initial state; When it is necessary to hydraulically adjust the stroke length between the outer cylinder section 4 and the inner cylinder section 5, first control the pressurized gas source in the boost tank 89 to be supplied into the oil storage tank 92 through the straight pipe 91. With the continuous supply of the pressurized gas source, the pressure of the hydraulic oil in the oil storage tank 92 is continuously increased, and the hydraulic oil in the oil storage tank 92 is forced to be supplied from the oil delivery pipe 93 through the four-way valve 95 into the three-way pipe 96, and then supplied into the sealing cylinder 98 through the threaded pipe 97. With the continuous supply of hydraulic oil, under the action of the hydraulic pressure, the thrust rod 99 is forced to push up in the sealing cylinder 98 and compress the return spring 16. At the same time, since the top of the thrust rod 99 is fixedly connected to the outer cylinder section 4 through the outer protrusion 17, and the outer cylinder section 4 is in a fixed state, With the cooperation of the inner slide groove 19 and the inner slide block 20 as well as the inner slide rail 21 and the inner slide bar 22, the raised thrust rod 99 forces the inner cylinder section 5 to slide down in the outer cylinder section 4 through the outer through groove 18, so that the stroke length of the inner cylinder section 5 in the outer cylinder section 4 as a whole tends to be shortened. On the contrary, the hydraulic oil supplied into the sealing cylinder 98 by the booster returns to the oil storage tank 92 along the original route. With the reduction of the hydraulic oil in the sealing cylinder 98, the hydraulic pressure is weakened accordingly. Under the cooperation of the weakened hydraulic pressure and the auxiliary elastic restoring force of the restoring spring 16, the stroke length of the inner cylinder section 5 in the outer cylinder section 4 as a whole tends to be extended, so that the adaptive stroke length adjustment work of the inner cylinder section 5 and the outer cylinder section 4 driven by the hydraulic pressure provided by the hydraulic oil can be completed. When the liquid level sensor 14 detects that the hydraulic oil in the oil storage tank 92 is insufficient due to loss, or the hydraulic oil in the oil storage tank 92 needs to be replaced, the booster gas source in the booster tank 89 is directly controlled to be supplied to the air supply pipe 94, and then supplied to the three-way pipe 96 through the four-way valve 95, and then supplied to the sealing cylinder 98 through the threaded pipe 97. With the continuous supply of the booster gas source, under the action of the booster gas source pressure, the thrust rod 99 is forced to push up in the sealing cylinder 98, and while compressing the return spring 16, the thrust rod 99 that is pushed up forces the inner cylinder section 5 to move upward through the outer groove 18. The inner cylinder section 5 slides down in the outer cylinder section 4, so that the stroke length of the inner cylinder section 5 as a whole in the outer cylinder section 4 tends to be shortened. On the contrary, the pressure relief valve on the pressure relief pipe 15 is opened, and the pressurized gas source supplied into the sealing cylinder 98 returns to the original path and is directly discharged through the pressure relief pipe 15 on the four-way valve 95. As the pressure of the pressurized gas source gradually weakens and the auxiliary elastic restoring force of the restoring spring 16 acts, the inner cylinder section 5 is forced to extend the stroke length of the outer cylinder section 4 as a whole, and the adaptive stroke length adjustment work of the inner cylinder section 5 and the outer cylinder section 4 driven by the pneumatic force provided by the pressurized gas source can be completed. After the adaptive stroke length adjustment work of the inner cylinder section 5 and the outer cylinder section 4 is completed, the upper lifting ear 6 is connected to the lifting sling through the external pin shaft, and the cargo connector is connected in the lower lifting ear 7 through the external pin shaft, and the hexagonal card pin heads are fixed on both sides of the upper and lower external pin shafts. First, the second electric push rod 111 is controlled to open and drive the second main bevel gear 112 to move down to the meshing part of the second secondary bevel gear 113, and then the double-headed motor 81 is controlled to restart and drive the second main bevel gear 112 to move down to the meshing part of the second secondary bevel gear 113 through the meshing of the second main bevel gear 113. 112 drives the forward and reverse screw rods 114 on the second bevel gear 113 to rotate forward synchronously, and the forward and reverse screw rods 114 drive the curved arms 116 on the two sets of screw rod sleeves 115 to move inward synchronously, and the rotating shafts 117 on the two curved arms 116 drive the two sets of clamping heads 122 to clamp to the hexagonal clamping pin heads on both sides of the inner and outer connecting pin shafts of the lower lifting ear 7 through the two sets of rotating heads 121, so that the overall clamping and positioning work of the two sets of clamping heads 122 on the hexagonal clamping pin heads on both sides of the inner and outer connecting pin shafts of the lower lifting ear 7 can be completed; At the same time, the rotating shaft 117 on the two curved arms 116 also drives the threaded sleeves 124, threaded rods 125, rotating wheels 126 and positioning seats 127 on the two sets of support plates 123 to move synchronously inward to the cargo connecting piece through the two sets of rotating heads 121, and then the rotating wheels 126 are respectively grasped to drive the threaded rods 125 to rotate clockwise in the threaded sleeves 124, and the threaded rods 125 drive the positioning seats 127 to support the cargo connecting piece inwardly. When the cargo and the cargo connecting piece swing in the lower hanging ear 7 through the external pin shaft, the two sets of clamps 122 also force the two sets of rotating heads 121 to rotate in the rotating shafts 117 on the two curved arms 116. The two sets of positioning seats 127 in the limited support state are driven to rotate accordingly, so as to prevent the positioning seats 127 from affecting the shaking work between the lower lifting ear 7 and the cargo connecting piece after the limited support. At this point, after completing the support work between the lower lifting ear 7 and the cargo connecting piece, first control the double-headed motor 81 to pause, then control the second electric push rod 111 to close and drive the second main bevel gear 112 to move up and disengage from the meshing part of the second sub-bevel gear 113 to the initial position, after completing the adaptive adjustment of the stroke length of the inner cylinder section 5 and the outer cylinder section 4, and completing the support connection with the sling and the cargo connecting piece, the cargo can be hoisted through the upper lifting ear 6 and the lower lifting ear 7.

[0025] It should be noted that the specific model specifications of the double-headed motor 81 and the electric push rod need to be selected and determined based on the actual specifications of the device, and the specific selection calculation method adopts the existing technology in this field, so it will not be repeated in detail.

[0026] The power supply circuits of the double-headed motor 81, the electric push rod, various valves and sensors are clear to those skilled in the art and will not be described in detail here.

[0027] It is to be understood that the present invention is described by some embodiments, and it is known to those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A thrust type hydraulic length adjustment device, comprising a back plate (1), characterized in that: The top of the back side of the back plate (1) is fixedly connected to a top frame (2), and both sides of the top frame (2) are fixedly connected to piston cylinders (3); The front surface of the back plate (1) is fixedly connected to an outer cylinder section (4), and the inner cavity of the outer cylinder section (4) is slidably connected to an inner cylinder section (5), the top of the inner cylinder section (5) is fixedly connected to an upper lifting lug (6), and the bottom of the outer cylinder section (4) is fixedly connected to a lower lifting lug (7); A working assembly (8) for supplying a pressurized gas source and a supply assembly (9) for adjusting the length of the inner cylinder section (5) are arranged on the rear side of the back plate (1), and the working assembly (8) includes a double-headed motor (81) fixed at the center of the back side of the back plate (1).

2. A thrust type hydraulic length adjustment device according to claim 1, characterized in that: The working assembly (8) further comprises a first electric push rod (82) embedded in an output shaft of the double-headed motor (81), and the piston rod of the first electric push rod (82) is fixedly connected to a first main bevel gear (83), and both sides of the top frame (2) close to the piston cylinder (3) are rotatably connected to a first secondary bevel gear (84) used in conjunction with the first main bevel gear (83), and the inner cavity of the first secondary bevel gear (84) is fixedly connected to a cam (85) via a fixed rod, and a connecting rod (86) is rotatably connected to the convex head of the cam (85), and the other end of the connecting rod (86) is hinged to a piston head (87) slidably matched with the piston cylinder (3), and the bottom of the piston cylinder (3) is connected to a boost pipe (88), and the other end of the boost pipe (88) is connected to a boost tank (89) fixedly matched with the top frame (2).

3. A thrust type hydraulic length adjustment device according to claim 2, characterized in that: The supply assembly (9) comprises a straight pipe (91) connected to the bottom of the boost tank (89), and the bottom end of the straight pipe (91) is connected to an oil storage tank (92), one end of the top of the oil storage tank (92) is connected to an oil delivery pipe (93), and the top end of one side of the boost tank (89) is connected to an air delivery pipe (94), the other ends of the oil delivery pipe (93) and the air delivery pipe (94) are both connected to a four-way valve (95), and the other end of the four-way valve (95) is connected to a three-way pipe (96) fixedly matched with the outer cylinder section (4), the top end of the three-way pipe (96) is connected to a threaded pipe (97), and the top end of the threaded pipe (97) is connected to a sealing cylinder (98) fixedly matched with the inner cylinder section (5), the inner cavity of the sealing cylinder (98) is fixedly connected to a thrust rod (99), and the top of the thrust rod (99) is fixedly connected to the outer cylinder section (4).

4. A thrust type hydraulic length adjustment device according to claim 3, characterized in that: A pressure sensor (13) is embedded in one end of the boosting tank (89) away from the gas pipeline (94), and a liquid level sensor (14) is embedded in one end of the oil storage tank (92) close to the oil pipeline (93).

5. A thrust type hydraulic length adjustment device according to claim 4, characterized in that: The front end of the four-way valve (95) is connected to a pressure relief pipe (15) with a pressure relief valve, and the other end of the top of the oil storage tank (92) is connected to a refueling pipe with a one-way valve, and the rear end of the oil storage tank (92) is connected to an oil discharge pipe with a one-way valve.

6. A thrust type hydraulic length adjustment device according to claim 5, characterized in that: The thrust rod (99) adopts an I-shaped structural design, and a return spring (16) fixedly matched with the inner cylinder section (5) is sleeved on the thrust rod (99), and is located outside the sealing cylinder (98).

7. A thrust type hydraulic length adjustment device according to claim 6, characterized in that: The top of the thrust rod (99) is integrally formed with an outer protrusion (17) fixedly matched with the outer cylinder section (4) on all sides, and the inner cylinder section (5) is provided with an outer through groove (18) slidably matched with the outer protrusion (17) on all sides.

8. The thrust type hydraulic length adjustment device according to claim 7, characterized in that: The inner cavity of the sealing cylinder (98) is provided with inner grooves (19) around its periphery, and the inner cavity of the inner groove (19) is slidably connected to an inner sliding block (20) fixedly matched with the bottom of the thrust rod (99).

9. A thrust type hydraulic length adjustment device according to claim 8, characterized in that: Inner slide rails (21) are provided around the inner cavity of the outer cylinder section (4), and the inner cavity of the inner slide rails (21) is slidably connected to an inner slide bar (22) fixedly matched with the inner cylinder section (5).

10. A thrust type hydraulic length adjustment device according to claim 9, characterized in that: The upper lifting lug (6) and the lower lifting lug (7) are both provided with external pin shafts, and both sides of the external pin shafts are fixedly connected with hexagonal bayonet heads, and the front side of the outer cylinder section (4) is fixedly connected with a PLC controller with an alarm light.

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