A lifting device capable of extending the distance

Abstract

The present invention relates to a lifting device capable of extending a distance. When it is necessary to use an overall device to lift a heavy object during actual use, the heavy object can be lifted by a lifting piece. When the heavy object exceeds the range of a main load-bearing beam, the secondary load-bearing beam can be lifted to rotate on the main load-bearing beam. When the secondary load-bearing beam and the main load-bearing beam are located on the same straight line, the secondary load-bearing beam can be fixed by a fixing assembly to prevent the secondary load-bearing beam from falling. Subsequently, the lifting piece can be slid onto the secondary load-bearing beam through a sliding piece to lift the heavy object. When it is used indoors or on a rooftop and objects outside the building need to be lifted, the mobile overall device can be used to move the secondary load-bearing beam to outside the building, and the heavy object can be lifted by the lifting piece. Thus, the lifting range can be conveniently improved. Furthermore, when used indoors or on a rooftop, objects outside the building can be lifted, thereby improving the scope of application.

Description

Technical Field

[0001] The invention relates to the technical field of hoisting, and in particular to a lifting device capable of extending a distance. Background Art

[0002] With the acceleration of urbanization, all walks of life have gradually realized semi-automatic mechanization and fully automatic mechanization to reduce labor intensity and improve production efficiency. Many companies have begun to introduce lifting devices to realize mechanical lifting. The commonly used mechanical lifting is a crane that utilizes various driving principles. It has the advantages of reliable lifting and high bearing capacity. With the development of the economy, it not only occupies an important position in the national economy, but also its application in the fields of social production and life is constantly expanding.

[0003] However, traditional lifting devices are not flexible enough when used. They can only lift items within the range of the hanger. When it is necessary to lift items outside the range of the hanger, it is often necessary to move the entire device to bring the items into the range of the hanger. It is not convenient to use, and when used indoors or on the roof, it is impossible to lift items outside the building, and its scope of application is small. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] In order to solve the above problems in the prior art, the present invention provides a lifting device capable of extending the distance, which can conveniently increase the lifting range, and when used indoors or on the roof, can lift objects outside the building, thereby increasing the scope of application.

[0006] (II) Technical solution

[0007] In order to achieve the above object, the main technical solutions adopted by the present invention include:

[0008] A lifting device capable of extending a distance comprises a support assembly, a main load-bearing beam, a hoisting member and an extension assembly, wherein the main load-bearing beam is mounted on the support assembly, the hoisting member is slidably connected to the main load-bearing beam via a sliding member, and one end of the main load-bearing beam is connected to the extension assembly;

[0009] The extension assembly includes a secondary load-bearing beam and a fixing assembly, the lower portion of the secondary load-bearing beam is rotatably connected to the lower portion of one end of the main load-bearing beam, and the upper portion of the secondary load-bearing beam is detachably connected to one end of the main load-bearing beam through the fixing assembly.

[0010] Furthermore, the main load-bearing beam and the secondary load-bearing beam are both provided with a slide groove adapted to the sliding member, and the hoisting member is slidably connected to the slide groove via the sliding member.

[0011] Furthermore, the support assembly includes a support rod and a gantry support frame, one end of the support rod is detachably connected to the other end of the main load-bearing beam, and the gantry support frame is detachably connected to one end of the main load-bearing beam.

[0012] Furthermore, reinforcing ribs are fixedly connected to the gantry support frame.

[0013] Furthermore, it also includes a weight piece, which is connected to the other end of the support rod.

[0014] Furthermore, the fixing assembly includes a tripod, a first fixing member and a second fixing member, the tripod is fixedly connected to the top of the gantry support frame, the upper part of the tripod is rotatably connected to one end of the first fixing member, the other end of the first fixing member is detachably connected to one end of the secondary load-bearing beam, one end of the second fixing member is fixedly connected to the lower part of the tripod, and the other end of the second fixing member is detachably connected to the middle end of the secondary load-bearing beam.

[0015] Furthermore, the fixing assembly also includes a preliminary fixing part, which includes a slot, an insert block and a pin. The upper part of one end of the main load-bearing beam is fixedly connected to the slot, and the other end of the secondary load-bearing beam is fixedly connected to the insert block. The insert block is detachably connected to the slot through the pin.

[0016] Furthermore, it also includes a limit block, one end of the secondary load-bearing beam is fixedly connected to the limit block, and the limit block is used to limit the sliding distance of the sliding member.

[0017] Furthermore, it also includes a movement limiting component, which is arranged at one end of the main load-bearing beam. The movement limiting component includes a stopper, a driving wheel and a pull rod. A receiving groove is arranged inside one end of the main load-bearing beam. The stopper is rotatably connected to the receiving groove through the driving wheel. One end of the pull rod is connected to the other end of the secondary load-bearing beam, and the other end of the pull rod is arranged inside the receiving groove. The other end of the pull rod is provided with a tooth groove and meshes with the driving wheel through the tooth groove.

[0018] Furthermore, the driving wheel is rotatably connected to the accommodating groove via a torsion spring.

[0019] (III) Beneficial effects

[0020] The beneficial effects of the present invention are as follows: during actual use, when it is necessary to use the overall device to hoist heavy objects, the overall device can be placed on a flat ground, and then the position of the hoisting parts on the main load-bearing beam can be adjusted so that the hoisting parts are aligned with the heavy objects, and then the heavy objects can be lifted by the hoisting parts. When the heavy objects exceed the range of the main load-bearing beam, the secondary load-bearing beam can be lifted to rotate on the main load-bearing beam. When the secondary load-bearing beam and the main load-bearing beam are located on the same straight line, the secondary load-bearing beam can be fixed by a fixing assembly to prevent the secondary load-bearing beam from falling, and then the hoisting parts can be slid onto the secondary load-bearing beam through a sliding part, and the heavy objects can be lifted. When it is used indoors or on the roof and objects outside the building need to be hoisted, the mobile overall device can be used to move the secondary load-bearing beam to outside the building, and the heavy objects can be lifted by the hoisting parts, thereby conveniently improving the hoisting range, and when used indoors or on the roof, objects outside the building can be hoisted, thereby improving the scope of application. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of a lifting device capable of extending a distance according to an embodiment of the present invention;

[0022] Figure 2 It is a schematic diagram of the overall structure of a lifting device capable of extending a distance according to an embodiment of the present invention;

[0023] Figure 3 It is a front view of the overall structure of a lifting device capable of extending a distance according to an embodiment of the present invention;

[0024] Figure 4 It is a schematic diagram of the use state of the extension component in the lifting device capable of extending the distance according to an embodiment of the present invention;

[0025] Figure 5 It is a schematic diagram of the structure of a movement limiting component in a lifting device capable of extending a distance according to an embodiment of the present invention;

[0026] Figure 6 It is a schematic diagram of a stowed state of a movement-limiting component in a lifting device capable of extending a distance according to an embodiment of the present invention;

[0027] Figure 7 This is a schematic diagram of the overall structure of a lifting device capable of extending a distance according to a second embodiment of the present invention;

[0028] [Description of Reference Numerals]

[0029] 1-ballast, 2-support rod, 3-main load-bearing beam, 4-gantry support frame, 5-trip frame, 6-first fixing member, 7-secondary load-bearing beam, 8-second fixing member, 9-bottom plate, 10-reinforcement rib, 11-lifting member, 12-sliding member, 13-movement restriction component, 14-slot, 15-insert block, 16-accommodating groove, 17-rotating shaft, 18-third fixing member, 19-fourth fixing member, 1301-stop block, 1302-pull rod, 1303-driving wheel. DETAILED DESCRIPTION

[0030] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below through specific implementation modes in conjunction with the accompanying drawings.

[0031] Please refer to Figures 1 to 6 As shown, a lifting device capable of extending a distance of the present invention comprises a support assembly, a main load-bearing beam 3, a hoisting member 11 and an extension assembly, wherein the main load-bearing beam 3 is mounted on the support assembly, the hoisting member 11 is slidably connected to the main load-bearing beam 3 through a sliding member 12, and one end of the main load-bearing beam 3 is connected to the extension assembly;

[0032] The extension assembly includes a secondary load-bearing beam 7 and a fixing assembly. The lower portion of the secondary load-bearing beam 7 is rotatably connected to the lower portion of one end of the main load-bearing beam 3, and the upper portion of the secondary load-bearing beam 7 is detachably connected to one end of the main load-bearing beam 3 via the fixing assembly.

[0033] The working principle of the present invention is as follows: in actual use, when it is necessary to use the overall device to hoist heavy objects, the overall device can be placed on a flat ground, and then the position of the hoisting component 11 on the main load-bearing beam 3 is adjusted so that the hoisting component 11 is aligned with the heavy object, and then the heavy object can be lifted by the hoisting component 11. When the heavy object exceeds the range of the main load-bearing beam 3, the secondary load-bearing beam 7 can be lifted to rotate the secondary load-bearing beam 7 on the main load-bearing beam 3. When the secondary load-bearing beam 7 and the main load-bearing beam 3 are located on the same straight line, the secondary load-bearing beam 7 can be fixed by a fixing assembly to prevent the secondary load-bearing beam 7 from falling. Then the hoisting component 11 is slid onto the secondary load-bearing beam 7 through the sliding component 12, and the heavy object is lifted. When it is used indoors or on the roof and objects outside the building need to be hoisted, the mobile overall device can be used to move the secondary load-bearing beam 7 to outside the building, and the heavy object can be lifted by the hoisting component 11.

[0034] Furthermore, the main load-bearing beam 3 and the secondary load-bearing beam 7 are both provided with a slide groove adapted to the sliding member 12 , and the hoisting member 11 is slidably connected to the slide groove through the sliding member 12 .

[0035] It can be seen from the above description that it is beneficial for the hanging member 11 to slide on the slide groove better through the sliding member 12 .

[0036] Furthermore, the support assembly includes a support rod 2 and a gantry support frame 4, one end of the support rod 2 is detachably connected to the other end of the main load-bearing beam 3, and the gantry support frame 4 is detachably connected to one end of the main load-bearing beam 3.

[0037] From the above description, it can be seen that the support rods 2 and the gantry support frame 4 are conducive to supporting the main load-bearing beam 3, and at the same time, the detachable connection facilitates the disassembly and transportation of the entire device.

[0038] Furthermore, a reinforcing rib 10 is fixedly connected to the gantry support frame 4 .

[0039] It can be seen from the above description that it is beneficial to improve the compressive strength of the gantry support frame 4.

[0040] Furthermore, it also includes a ballast piece 1, which is connected to the other end of the support rod 2.

[0041] From the above description, it can be seen that it is helpful to prevent the supporting rod 2 from being pried up when the secondary load-bearing beam 7 is lifting heavy objects, thereby eliminating safety hazards.

[0042] Furthermore, the fixing assembly includes a tripod 5, a first fixing member 6 and a second fixing member 8, the tripod 5 is fixedly connected to the top of the gantry support frame 4, the upper part of the tripod 5 is rotatably connected to one end of the first fixing member 6, the other end of the first fixing member 6 is detachably connected to one end of the secondary load-bearing beam 7, one end of the second fixing member 8 is fixedly connected to the lower part of the tripod 5, and the other end of the second fixing member 8 is detachably connected to the middle end of the secondary load-bearing beam 7.

[0043] From the above description, it can be seen that it is beneficial to install the first fixing member 6 and the second fixing member 8 through the tripod 5, and then fix the secondary load-bearing beam 7 through the first fixing member 6 and the second fixing member 8 to prevent the secondary load-bearing beam 7 from collapsing during lifting.

[0044] Furthermore, the fixing assembly also includes a preliminary fixing part, which includes a slot 14, an insert block 15 and a latch. The upper part of one end of the main load-bearing beam 3 is fixedly connected to the slot 14, and the other end of the secondary load-bearing beam 7 is fixedly connected to the insert block 15. The insert block 15 is detachably connected to the slot 14 via the latch.

[0045] From the above description, it can be seen that when the auxiliary load-bearing beam 7 is rotated and lifted on the main load-bearing beam 3, the plug 15 on the auxiliary load-bearing beam 7 is inserted into the slot 14, and then the slot 14 and the plug 15 are prevented from separating by the latch, thereby preliminarily fixing the auxiliary load-bearing beam 7, and then the auxiliary load-bearing beam 7 is secondarily fixed by the first fixing member 6 and the second fixing member 8.

[0046] Furthermore, a limit block is also included. One end of the secondary load-bearing beam 7 is fixedly connected to the limit block, and the limit block is used to limit the sliding distance of the sliding member 12.

[0047] It can be seen from the above description that it is helpful to prevent the sliding member 12 from being separated from the secondary load-bearing beam 7 when sliding on the secondary load-bearing beam 7 .

[0048] Furthermore, it also includes a movement limiting component 13, which is arranged at one end of the main load-bearing beam 3. The movement limiting component 13 includes a stopper 1301, a driving wheel 1303 and a pull rod 1302. A receiving groove 16 is arranged inside one end of the main load-bearing beam 3. The stopper 1301 is rotatably connected to the receiving groove 16 through the driving wheel 1303. One end of the pull rod 1302 is connected to the other end of the auxiliary load-bearing beam 7. The other end of the pull rod 1302 is arranged inside the receiving groove 16. The other end of the pull rod 1302 is provided with a tooth groove, and is meshed with the driving wheel 1303 through the tooth groove.

[0049] From the above description, it can be seen that when the auxiliary load-bearing beam 7 is in normal use, the stopper 1301 is stored in the receiving groove 16, so that the sliding member 12 can slide back and forth between the auxiliary load-bearing beam 7 and the main load-bearing beam 3. When the auxiliary load-bearing beam 7 is not in use, the auxiliary load-bearing beam 7 pulls the pull rod 1302 during rotation, so that the pull rod 1302 moves in the receiving groove 16, and the tooth groove on the pull rod 1302 engages with the driving wheel 1303, driving the driving wheel 1303 to rotate and causing the stopper 1301 to rotate and lift, thereby preventing the sliding member 12 from detaching from the main load-bearing beam 3 during sliding.

[0050] Furthermore, the driving wheel 1303 is rotatably connected to the receiving groove 16 via a torsion spring.

[0051] From the above description, it can be seen that when the auxiliary load-bearing beam 7 is rotated and lifted, the torsion spring drives the driving wheel 1303 to reset, so that the stopper 1301 can be quickly lowered.

[0052] Embodiment 1

[0053] Please refer to Figures 1 to 6 , a lifting device capable of extending a distance, comprising a support assembly, a main load-bearing beam 3, a hoisting member 11 and an extension assembly, wherein the main load-bearing beam 3 is mounted on the support assembly, the hoisting member 11 is slidably connected to the main load-bearing beam 3 through a sliding member 12, and one end of the main load-bearing beam 3 is connected to the extension assembly;

[0054] The hoisting member 11 is an electric hoist;

[0055] The extension assembly includes a secondary load-bearing beam 7 and a fixing assembly, wherein the lower portion of the secondary load-bearing beam 7 is rotatably connected to the lower portion of one end of the main load-bearing beam 3 via a rotating shaft 17, and the upper portion of the secondary load-bearing beam 7 is detachably connected to one end of the main load-bearing beam 3 via a fixing assembly;

[0056] The length of the secondary load-bearing beam 7 is 1 to 4 meters, and the secondary load-bearing beam 7 of different lengths can be replaced according to needs;

[0057] The main load-bearing beam 3 and the secondary load-bearing beam 7 are both provided with a slide groove adapted to the sliding member 12, and the hoisting member 11 is slidably connected to the slide groove through the sliding member 12;

[0058] The sliding member 12 includes a connecting plate, a side plate and a pulley. One side of the connecting plate is connected to the hanging member 11 by screws. Both sides of the other side of the connecting plate are fixedly connected to a side plate. The side plates are slidably connected to the slide grooves by the pulleys.

[0059] The support assembly includes a support rod 2 and a gantry support frame 4, one end of the support rod 2 is detachably connected to the other end of the main load-bearing beam 3 by bolts, a reinforcing rib 10 is detachably connected to the connection between one end of the support rod 2 and the other end of the main load-bearing beam 3, and the gantry support frame 4 is detachably connected to one end of the main load-bearing beam 3 by bolts;

[0060] The support assembly also includes a universal wheel, and the bottom of the support rod 2 and the gantry support frame 4 are both mounted with the universal wheel by screws;

[0061] The other end of the gantry support frame 4 is welded with a bottom plate 9;

[0062] The gantry support frame 4 is fixedly connected with a reinforcing rib 10 by welding;

[0063] It also includes a ballast 1, which is connected to the other end of the support rod 2 by welding;

[0064] The ballast 1 is in the shape of a basket;

[0065] The ballast member 1 is used to carry the ballast object;

[0066] The other end of the main load-bearing beam 3 is also provided with a spiral telescopic rod, which can be used to support the spiral telescopic rod against the ceiling when used in a building. When the items in the device are too heavy, the spiral telescopic rod can prevent the entire device from tilting up.

[0067] The spiral telescopic rod comprises a screw and a sleeve, one end of the screw is welded to the other end of the main load-bearing beam 3, and the sleeve is sleeved on the outer surface of the other end of the screw and is threadedly connected;

[0068] The fixing assembly includes a tripod 5, a first fixing member 6, and a second fixing member 8. The tripod 5 is fixedly connected to the top of the gantry support frame 4 by welding. The upper part of the tripod 5 is rotatably connected to one end of the first fixing member 6. The other end of the first fixing member 6 is detachably connected to one end of the secondary load-bearing beam 7 by bolts. One end of the second fixing member 8 is fixedly connected to the lower part of the tripod 5 by welding. The other end of the second fixing member 8 is detachably connected to the middle end of the secondary load-bearing beam 7 by bolts.

[0069] It also includes a third fixing member 18 and a fourth fixing member 19, one end of the third fixing member 18 is rotatably connected to a side of the tripod 5 away from the first fixing member 6, and the other end of the third fixing member 18 is detachably connected to the other end of the main load-bearing beam 3 through a bolt;

[0070] The fourth fixing member 19 is welded to a surface of the tripod 5 away from the first fixing member 6, and the other end of the fourth fixing member 19 is detachably connected to the middle end of the main load-bearing beam 3 by bolts;

[0071] The third fixing member 18 has the same structure as the first fixing member 6, and the fourth fixing member 19 has the same structure as the second fixing member 8;

[0072] The fixing assembly also includes a preliminary fixing part, which includes a slot 14, an insert block 15 and a latch. The upper part of one end of the main load-bearing beam 3 is fixedly connected with the slot 14 by welding, and the other end of the secondary load-bearing beam 7 is fixedly connected with the insert block 15 by welding. The insert block 15 is detachably connected to the slot 14 by the latch.

[0073] It also includes a limit block, one end of the secondary load-bearing beam 7 is fixedly connected to the limit block by welding, and the limit block is used to limit the sliding distance of the sliding member 12;

[0074] It also includes a movement limiting component 13, which is arranged at one end of the main load-bearing beam 3, and includes a stopper 1301, a driving wheel 1303 and a tie rod 1302. A receiving groove 16 is arranged inside one end of the main load-bearing beam 3, and the stopper 1301 is rotatably connected to the receiving groove 16 through the driving wheel 1303. One end of the tie rod 1302 is connected to the other end of the auxiliary load-bearing beam 7, and the other end of the tie rod 1302 is arranged inside the receiving groove 16. The other end of the tie rod 1302 is provided with a tooth groove, and is meshed with the driving wheel 1303 through the tooth groove.

[0075] The driving wheel 1303 is rotatably connected to the receiving groove 16 via a torsion spring.

[0076] Embodiment 2

[0077] Please refer to Figure 7 , a lifting device capable of extending a distance, comprising a support assembly, a main load-bearing beam 3, a hoisting member 11 and an extension assembly, wherein the main load-bearing beam 3 is mounted on the support assembly, the hoisting member 11 is slidably connected to the main load-bearing beam 3 through a sliding member 12, and one end of the main load-bearing beam 3 is connected to the extension assembly;

[0078] The hoisting member 11 is an electric hoist;

[0079] The extension assembly includes a secondary load-bearing beam 7 and a fixing assembly, one side of the fixing assembly is detachably connected to the upper portion of the secondary load-bearing beam 7, and the other side of the fixing assembly is detachably connected to one end of the main load-bearing beam 3;

[0080] The fixing assembly is used to improve the compressive strength of the secondary load-bearing beam 7;

[0081] The main load-bearing beam 3 and the secondary load-bearing beam 7 are an integrated structure;

[0082] The main load-bearing beam 3 and the secondary load-bearing beam 7 are both provided with a slide groove adapted to the sliding member 12, and the hoisting member 11 is slidably connected to the slide groove through the sliding member 12;

[0083] The sliding member 12 includes a connecting plate, a side plate and a pulley. One side of the connecting plate is connected to the hanging member 11 by screws. Both sides of the other side of the connecting plate are fixedly connected to a side plate. The side plates are slidably connected to the slide grooves by the pulleys.

[0084] The support assembly includes a support rod 2 and a gantry support frame 4, one end of the support rod 2 is detachably connected to the other end of the main load-bearing beam 3 by bolts, a reinforcing rib 10 is detachably connected to the connection between one end of the support rod 2 and the other end of the main load-bearing beam 3, and the gantry support frame 4 is detachably connected to one end of the main load-bearing beam 3 by bolts;

[0085] The support assembly also includes a universal wheel, and the bottom of the support rod 2 and the gantry support frame 4 are both mounted with the universal wheel by screws;

[0086] The other end of the gantry support frame 4 is welded with a bottom plate 9;

[0087] The gantry support frame 4 is fixedly connected with a reinforcing rib 10 by welding;

[0088] It also includes a ballast 1, which is connected to the other end of the support rod 2 by welding;

[0089] The ballast 1 is in the shape of a basket;

[0090] The ballast member 1 is used to carry the ballast object;

[0091] The other end of the main load-bearing beam 3 is also provided with a spiral telescopic rod, which can be used to support the spiral telescopic rod against the ceiling when used in a building. When the items in the device are too heavy, the spiral telescopic rod can prevent the entire device from tilting up.

[0092] The spiral telescopic rod comprises a screw and a sleeve, one end of the screw is welded to the other end of the main load-bearing beam 3, and the sleeve is sleeved on the outer surface of the other end of the screw and is threadedly connected;

[0093] The fixing assembly includes a tripod 5, a first fixing member 6, and a second fixing member 8. The tripod 5 is fixedly connected to the top of the gantry support frame 4 by welding. The upper part of the tripod 5 is rotatably connected to one end of the first fixing member 6. The other end of the first fixing member 6 is detachably connected to one end of the secondary load-bearing beam 7 by bolts. One end of the second fixing member 8 is fixedly connected to the lower part of the tripod 5 by welding. The other end of the second fixing member 8 is detachably connected to the middle end of the secondary load-bearing beam 7 by bolts.

[0094] It also includes a third fixing member 18 and a fourth fixing member 19, one end of the third fixing member 18 is rotatably connected to a side of the tripod 5 away from the first fixing member 6, and the other end of the third fixing member 18 is detachably connected to the other end of the main load-bearing beam 3 through a bolt;

[0095] The fourth fixing member 19 is welded to a surface of the tripod 5 away from the first fixing member 6, and the other end of the fourth fixing member 19 is detachably connected to the middle end of the main load-bearing beam 3 by bolts;

[0096] The third fixing member 18 has the same structure as the first fixing member 6, and the fourth fixing member 19 has the same structure as the second fixing member 8;

[0097] It also includes a limit block, one end of the secondary load-bearing beam 7 is fixedly connected to the limit block by welding, and the limit block is used to limit the sliding distance of the sliding member 12.

[0098] The above shows and describes the basic principles, main features and advantages of the present invention, and the standard parts used in the present invention can be purchased from the market, and special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part adopt the conventional means such as mature bolts, rivets, welding, etc. in the prior art. The machinery, parts and equipment all adopt the conventional models in the prior art, and the circuit connection adopts the conventional connection method in the prior art, which will not be described in detail here.

[0099] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's specification and drawings, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A lifting device capable of extending the distance, characterized in that: It comprises a support assembly, a main load-bearing beam, a hanging member and an extension assembly, wherein the main load-bearing beam is mounted on the support assembly, the hanging member is slidably connected to the main load-bearing beam through a sliding member, and one end of the main load-bearing beam is connected to the extension assembly; The extension assembly includes a secondary load-bearing beam and a fixing assembly, wherein the lower portion of the secondary load-bearing beam is rotatably connected to the lower portion of one end of the main load-bearing beam, and the upper portion of the secondary load-bearing beam is detachably connected to one end of the main load-bearing beam through the fixing assembly; The main load-bearing beam and the secondary load-bearing beam are both provided with a slide groove adapted to the sliding member, and the hoisting member is slidably connected to the slide groove through the sliding member; The support assembly includes a support rod and a gantry support frame, one end of the support rod is detachably connected to the other end of the main load-bearing beam, and the gantry support frame is detachably connected to one end of the main load-bearing beam; The fixing assembly includes a tripod, a first fixing member and a second fixing member, the tripod is fixedly connected to the top of the gantry support frame, the upper part of the tripod is rotatably connected to one end of the first fixing member, the other end of the first fixing member is detachably connected to one end of the secondary load-bearing beam, one end of the second fixing member is fixedly connected to the lower part of the tripod, and the other end of the second fixing member is detachably connected to the middle end of the secondary load-bearing beam; The fixing assembly further includes a preliminary fixing part, which includes a slot, an insert block and a latch, wherein the slot is fixedly connected to the upper part of one end of the main load-bearing beam, and the insert block is fixedly connected to the other end of the secondary load-bearing beam, and the insert block is detachably connected to the slot through the latch; It also includes a limit block, one end of the secondary load-bearing beam is fixedly connected to the limit block, and the limit block is used to limit the sliding distance of the sliding member; It also includes a movement limiting component, which is arranged at one end of the main load-bearing beam. The movement limiting component includes a stopper, a driving wheel and a pull rod. A receiving groove is arranged inside one end of the main load-bearing beam. The stopper is rotatably connected to the receiving groove through the driving wheel. One end of the pull rod is connected to the other end of the auxiliary load-bearing beam, and the other end of the pull rod is arranged inside the receiving groove. The other end of the pull rod is provided with a tooth groove and meshes with the driving wheel through the tooth groove.

2. The lifting device capable of extending the distance as claimed in claim 1, characterized in that: The gantry support frame is fixedly connected with reinforcing ribs.

3. The lifting device capable of extending the distance as claimed in claim 1, characterized in that: It also includes a weight piece, which is connected to the other end of the support rod.

4. The lifting device capable of extending the distance as claimed in claim 1, characterized in that: The driving wheel is rotatably connected to the accommodating groove via a torsion spring.

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