A double lifting system crane trolley

Abstract

The present invention discloses a double-lifting system crane trolley, which relates to the technical field of lifting equipment, and includes a first moving trolley and a second moving trolley slidably connected to a boom, a guide rail is connected to the inner side of one end of the boom, the first moving trolley and the second moving trolley are slidably connected to the guide rail, a support platform is connected to the inner side of one end of the boom close to the guide rail, a traction device is connected to the support platform, a steel wire rope is wound around the traction device, and the steel wire rope is connected to the first moving trolley and the second moving trolley. The double-lifting system crane trolley of the present invention can support the other lifting system when one lifting system is stuck, so that the whole forms an isosceles triangle to maintain the stability of the hooks on both sides, improve the safety when lifting objects, and avoid the center offset caused by shaking.

Description

Technical Field

[0001] The present invention relates to the technical field of lifting equipment, and more specifically to a double-lifting system type crane trolley. Background Art

[0002] Cranes are very important equipment used for lifting, transporting and installing heavy objects. The crane mobile trolley equipped with two lifting systems is a special design to improve work efficiency and flexibility. It is suitable for outdoor lifting of long objects or two hooks acting on the same object. It has a greater load capacity than a single system to improve the load capacity and avoid rotation during the lifting process.

[0003] The Chinese patent application number 201210209345.9 discloses a lifting trolley for a double-beam bridge crane, which includes a trolley frame, a travel wheel is installed at the bottom of the trolley frame, and a first lifting assembly and a second lifting assembly are arranged on the trolley frame. The first lifting assembly includes a first driving device, a transmission assembly, a first reduction mechanism, a first drum, a first fixed pulley block and a first lifting hook, and the second lifting assembly includes a running driving device, a lifting driving device, a second drum, a second reduction mechanism, a second fixed pulley block and a second lifting hook. The lifting trolley for a double-beam bridge crane is provided with double hooks on the moving trolley, which has the function of improving the carrying capacity and improving the stability.

[0004] The Chinese patent application number 202211704208.2 discloses a double-trolley bridge crane with connectable hooks. The structure includes two end beams, two main beams are arranged between the two end beams, a lifting trolley is arranged on the main beam, and the lifting trolley includes a trolley frame, a drum drive motor is installed on the top of the trolley frame, and the drum drive motor drives the wire rope drum; a sling is arranged below the lifting trolley, the sling includes a mounting frame, a hook is arranged at the bottom of the mounting frame, and connecting devices are arranged on both sides of the mounting frame, and the connecting devices include a rotating motor and a docking electric cylinder; a docking plug is arranged at the end of the docking electric cylinder on one sling, and a docking slot matching the docking plug is arranged at the end of the docking electric cylinder on the other sling. This double-trolley bridge crane with connectable hooks has the function of lifting objects through two hooks, and can connect the two hooks to form a whole, thereby improving the stability during lifting.

[0005] The current double lifting system crane trolley still has the following problems:

[0006] 1. When two lifting systems act on the same object, a single lifting structure may experience wire rope breakage, pulley damage, motor failure, etc. after long-term use. Not only will it cause the lifting to fail, but these problems may also cause the goods to fall, causing personal injury or property loss. At the same time, it will cause the center of the goods to shift, causing the lifting system on the other side to be unable to lift the goods normally.

[0007] 2. When the two lifting systems drive the object to move horizontally, the two traction devices need to keep rotating synchronously, otherwise the two mobile vehicles will move asynchronously, which will affect the stability of the lifted goods. For example, the angle between the two steel ropes will become larger, and the steel ropes will pull the object to both ends, increasing the instability of the goods.

[0008] 3. When the roller on the traction device stops, the brake system needs to be controlled separately to clamp the roller and keep it in a stopped state to improve the stability of the lifting. For the structure of the double lifting system, more brake structures need to be controlled separately, which increases the cumbersomeness of control. If the brake system is not opened in time, it will increase the burden on the drive device and cause safety hazards.

[0009] Therefore, it is necessary to propose a double lifting system crane trolley to solve the above problems. Summary of the invention

[0010] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a double lifting system crane trolley to solve the problems raised in the above background technology.

[0011] The technical solution is as follows: the present invention comprises a first moving trolley and a second moving trolley which are slidably connected to the boom, a guide rail is connected to the inner side of one end of the boom, the first moving trolley and the second moving trolley are slidably connected to the guide rail, a support platform is connected to the inner side of the end of the boom close to the guide rail, a traction device is connected to the support platform, a traction wire rope is wound around the traction device, the traction wire rope is connected to the first moving trolley and the second moving trolley, and a lifting winch is connected to the top of the end of the boom away from the guide rail;

[0012] The hoisting winch is connected with a lifting wire rope, and the upper part of the lifting wire rope is connected with a lifting assembly, and the lifting assembly includes a transverse plate, a left connecting frame and a right connecting frame located above the transverse plate, the left connecting frame and the right connecting frame are both connected with a first connecting shaft inside, both ends of the first connecting shaft are rotatably connected with a lifting wheel, the lifting wire rope passes through the bottom of the lifting wheel, and the middle part of the first connecting shaft is connected with two symmetrically distributed upper pulleys, the two ends of the transverse plate are connected with symmetrically arranged fixing blocks, the fixing blocks are connected with a hook, and the front and rear ends of the fixing block are rotatably connected with a lower pulley, and a closed supporting rope is wound on the outer annular surfaces of the upper pulley and the lower pulley;

[0013] The bottom of the left connecting frame and the right connecting frame are both connected to a second connecting shaft, the outer ring surface of the second connecting shaft is rotatably connected to a tension rod and a hydraulic rod, the bottom of the tension rod is rotatably connected to a first rotating table, the bottom of the hydraulic rod is connected to a second rotating table, and the first rotating table and the second rotating table are connected to the top of the cross plate.

[0014] Furthermore, the tops of the left connecting frame and the right connecting frame are connected with fan-shaped support frames arranged in pairs, and unlocking brackets are connected between the fan-shaped support frames. The unlocking bracket has a first oil chamber with two ends opened inside, and the two ends of the first oil chamber are slidably connected with lifting rods, one end of the lifting rod is rotatably connected with a roller in contact with the lifting wire rope, and the two lifting rods are connected by a spring;

[0015] The bottom of the horizontal plate is connected to an oil storage tank, one side of the oil storage tank is connected to multiple groups of connecting components, an oil pipeline is connected between the connecting component and the hydraulic rod, a sixth oil chamber is opened inside the connecting component, an oil pipeline is connected between the sixth oil chamber and the first oil chamber, and slideways are symmetrically opened on the horizontal plate, and the second rotating platform is symmetrically slidably connected in the slideways;

[0016] The tension rod includes a fixed rod and a movable rod sleeved on one end of the fixed rod, the movable rod is slidably connected to the outside with a movable ring, the movable ring is slidably connected to the inside with a first clamping block that passes through the movable rod and is inserted into the fixed rod, and the first clamping block connects the movable rod and the fixed rod.

[0017] Furthermore, the hydraulic rod comprises an inner rod and an outer tube sleeved on the outer wall of the inner rod, one end of the inner rod located in the outer tube is connected to a partition, the top of the outer tube is connected to a pressure plate in contact with the outer wall of the inner rod, the bottom of the outer tube is connected to a rotation support block, the rotation support block is rotationally connected to the second rotating table, a third oil chamber and an arc-shaped oil chamber connected to each other are opened inside the rotation support block, an oil pipeline is connected between the third oil chamber and the connecting component, and the third oil chamber is connected to the inside of the outer tube;

[0018] An annular groove is provided on one side of the rotating support block, a circular plate is rotatably connected in the annular groove, a baffle extending into the arc-shaped oil chamber is connected to one side of the circular plate, and the circular plate is fixedly connected to the inner annular surface of the second rotating table;

[0019] A multi-section hydraulic push rod is connected to both ends of the slideway, one end of the multi-section hydraulic push rod is connected to the second rotating table, a fourth oil chamber is provided between the pressure plate and the partition, and the multi-section hydraulic push rod and the fourth oil chamber are connected through an oil pipeline.

[0020] Furthermore, the interior of the fixed block is connected with an annular oil pipe, the interior of the annular oil pipe is penetrated by a piston plate, the inner annular surface of the piston plate is connected with a central pipe penetrating the movable annular oil pipe, a second oil chamber is formed between the annular oil pipe and the piston plate, the top of the hook is connected to the central pipe, and an oil pipeline is connected between the oil storage tank and the second oil chamber;

[0021] A fifth oil chamber is provided inside the first rotating table, and an extension rod arranged toward the tension rod is slidably connected in the fifth oil chamber. When the extension rod is extended, it pushes the tension rod to rotate, and an oil pipeline is connected between the fifth oil chamber and the connecting component.

[0022] Furthermore, the two ends of the fan-shaped support frame are connected with symmetrically arranged fixed brackets, and the symmetrically arranged fixed brackets are located on both sides of the unlocking bracket. One end of the fixed bracket is rotatably connected to a roller toward the lifting wire rope, and the lifting wire rope passes between the fixed bracket and the unlocking bracket.

[0023] Further, a spring is connected between the movable ring and the fixed rod, a spring is connected between the fixed rod and the top of the movable rod, a first unlocking cavity is opened in the movable ring, the first clamping block is slidably connected in the first unlocking cavity, a spring is connected between the first clamping block and the first unlocking cavity, the first clamping block passes through the movable rod and is inserted into the fixed rod, and the first unlocking cavity and the first oil cavity are connected through an oil pipeline;

[0024] A plurality of positioning components are connected to both sides of the transverse plate, a positioning hole matching with the positioning components is opened on one side of the second rotating platform, the positioning components at both ends are connected to the first oil chamber through an oil pipeline, and a reset handle is connected to the middle positioning component.

[0025] Further, the connecting component includes a switch support block, the switch support block is provided with a liquid flow channel and a sixth oil chamber inside, the liquid flow channel is connected between the oil storage tank and the oil pipeline, a fluid piston is slidably connected in the sixth oil chamber, a spring is connected between the fluid piston and the sixth oil chamber, a hole groove for inserting the fluid piston is provided on the side wall of the liquid flow channel, and an oil pipeline is connected between the sixth oil chamber and the first oil chamber;

[0026] The first oil chamber on the left connecting frame is connected to the sixth oil chamber on the right connecting frame through an oil pipeline, and the first oil chamber on the right connecting frame is connected to the sixth oil chamber on the left connecting frame through an oil pipeline.

[0027] Furthermore, elastic brackets are connected to the tops of both ends of the horizontal plate, elastic rods are slidably connected in the elastic brackets, springs are connected between the elastic rods and the elastic brackets, elastic rollers in contact with the support ropes are connected to the tops of the elastic rods, positioning components are connected to the elastic brackets, the tops of the elastic rods are provided with inclined tooth surfaces corresponding to the positioning components, and the tops of the positioning components are connected with reset handles;

[0028] The positioning assembly comprises a locking block, a positioning clamping block is slidably connected inside the locking block, a spring is connected between the positioning clamping block and the inner wall of the locking block, and the positioning clamping block matches with the positioning hole and the inclined tooth surface.

[0029] Further, the traction device includes a speed reducer, a rotating shaft located at the output end of the speed reducer, the outer ring surface of the rotating shaft is rotatably connected with a first roller and second rollers located at both ends of the first roller, the inner ring surfaces of the opposite ends of the first roller and the second roller are provided with an inner spline portion, the rotating shaft is provided with an outer spline portion corresponding to the inner spline portion, a spline block is slidably connected between the inner spline portion and the outer spline portion, and the spline block is spline-connected to the inner spline portion and the outer spline portion;

[0030] A fixed plate is provided at the bottom of the first roller and the second roller, the top of the fixed plate is connected to a support frame, the rotating shaft is rotatably connected to the support frame, the top of the support frame is connected to a hydraulic cylinder, the protruding end of the hydraulic cylinder is connected to a push plate, the bottom of the push plate is connected to a ramp block, and the bottom of the ramp block is rotatably connected to a spline block.

[0031] Furthermore, the fixed plate is fixedly connected to the top of the supporting platform, the outer ring surfaces of the first roller and the second roller are connected at both ends with brake ring plates, the bottom of the fixed plate is rotatably connected to a brake arm, the middle part of the brake arm is rotatably connected to a brake plate in contact with the brake ring plate, a spring is connected between the fixed plate and the brake arm, the top of the brake arm is rotatably connected to a roller, and inclined surfaces for roller movement are provided on both sides of the inclined surface block.

[0032] Compared with the existing known technologies, the technical solution provided by the present invention has the following significant effects:

[0033] 1. Through the coordinated setting of the hydraulic rod and the tension rod at the bottom of the lifting assembly, this device can support the other lifting system when one lifting system is stuck, so that the whole forms an isosceles triangle to maintain the stability of the hooks on both sides, improve the safety when lifting objects, and avoid the center offset caused by shaking.

[0034] 2. Through the coordination of the spline block between the first roller and the second roller, the first roller and the second roller can rotate synchronously, which plays a role in maintaining the synchronous movement of the first moving trolley and the second moving trolley, preventing the unstable lifting due to the change in the spacing between the two trolleys, and has the effect of improving the lifting stability. At the same time, it can quickly switch between individual control and simultaneous control, thereby improving the precise control of the moving vehicle.

[0035] 3. The device is provided with an inclined surface block on the spline block. The inclined surface block and the brake arm are matched to automatically open and close the brake system without the need for separate control, thereby improving convenience. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a three-dimensional schematic diagram of the structure of the present invention;

[0037] Figure 2 It is a partial cross-sectional view of the structure of the present invention;

[0038] Figure 3 It is a schematic diagram of the left connecting frame and the right connecting frame structure in the present invention;

[0039] Figure 4 It is a schematic diagram of the hydraulic rod structure in the present invention;

[0040] Figure 5 It is a schematic diagram of the first rotating platform and the rotating support block structure in the present invention;

[0041] Figure 6 It is a schematic diagram of the oil storage tank and the connecting component structure in the present invention;

[0042] Figure 7 It is a schematic diagram of the fan-shaped support frame and the unlocking support structure in the present invention;

[0043] Figure 8 It is a schematic diagram of the tension rod and the first rotating platform structure in the present invention;

[0044] Fig. 9 It is a schematic diagram of the annular oil pipe and the piston plate structure in the present invention;

[0045] Fig.10 A schematic diagram of the structure of the first roller and the second roller in the present invention;

[0046] Fig.11 It is a schematic diagram of the structure of the spline block and the push plate in the present invention;

[0047] Fig.12 It is a schematic diagram of the structure of the outer spline part and the spline block in the present invention;

[0048] Fig.13 It is a schematic diagram of the lifting assembly before and after deformation in the present invention.

[0049] Reference numerals:

[0050] 101. boom; 102. first mobile trolley; 103. second mobile trolley; 104. support platform; 105. traction device; 106. hoisting winch; 107. cross plate; 108. left connecting frame; 109. right connecting frame; 110. first connecting shaft; 111. lifting wheel; 112. upper pulley; 113. fixing block; 114. hook; 115. lower pulley; 116. support rope; 117. second connecting shaft; 118. tension rod; 119. first rotating platform; 120 , hydraulic rod; 121, second rotating table; 201, inner rod; 202, outer tube; 203, partition; 204, pressure plate; 205, rotating support block; 206, third oil chamber; 207, arc oil chamber; 208, annular groove; 209, circular plate; 210, baffle; 211, slideway; 212, multi-section hydraulic push rod; 213, fourth oil chamber; 301, fifth oil chamber; 302, extension rod; 303, annular oil pipe; 304, piston plate; 305, center pipe; 306, first Second oil chamber; 307, oil storage tank; 308, connecting assembly; 309, switch support block; 310, liquid flow channel; 311, sixth oil chamber; 312, fluid piston; 401, fan-shaped support frame; 402, fixed support; 403, roller; 404, unlocking support; 405, first oil chamber; 406, lifting rod; 407, fixed rod; 408, movable rod; 409, moving ring; 410, first unlocking chamber; 411, first clamping block; 412, positioning assembly; 413, reset handle ;501, elastic bracket; 502, elastic rod; 503, elastic roller; 504, inclined tooth surface; 505, positioning block; 506, locking block; 601, reducer; 602, rotating shaft; 603, first roller; 604, second roller; 605, inner spline part; 606, outer spline part; 607, spline block; 608, fixing plate; 609, hydraulic cylinder; 610, push plate; 611, inclined block; 612, brake ring plate; 613, brake arm; 614, brake pad. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical scheme and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention, that is, the embodiments described are only part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0052] Depend on Figures 1 to 13 The invention provides a method of controlling a left connecting frame 108 and a right connecting frame 109 respectively, comprising a first moving trolley 102 and a second moving trolley 103 which are slidably connected to a boom 101. The two moving trolleys are used to control the left connecting frame 108 and the right connecting frame 109 respectively. When two hooks 114 act on the same object, the distance between the first moving trolley 102 and the second moving trolley 103 can be adjusted to form an inverted triangle between the two steel wire ropes, so as to improve the stability during hoisting. A guide rail is connected to the inner side of one end of the boom 101, and the first moving trolley 102 and the second moving trolley 103 are slidably connected to the guide rail. A supporting platform 104 is connected to the inner side of one end of the boom 101 close to the guide rail, and a traction device 105 is connected to the supporting platform 104. The traction device 105 is used to tow the first moving trolley 102 and the second moving trolley 103. The two moving vehicles 103 are moved, and the traction device 105 is wound with a steel wire rope, and the steel wire rope is connected to the first moving vehicle 102 and the second moving vehicle 103. The bottom of the first moving vehicle 102 is a left connecting frame 108, and the bottom of the second moving vehicle 103 is connected to a right connecting frame 109 through a steel wire rope. The top of the end of the boom 101 away from the guide rail is connected to a lifting winch 106. Specifically, the boom 101 is installed on a slewing support seat, which is also called a slewing support or a rotating support. It is a key component connecting the upper structure and the lower structure of the crane. It not only supports the weight of the upper structure of the crane, but also allows the upper structure to rotate 360 ​​degrees relative to the lower structure, thereby realizing the lifting operation of goods in different directions. This is a mature device, so it will not be described in detail.

[0053] refer to Figure 3The hoisting winch 106 is connected with a steel wire rope, and the steel wire rope is connected with a lifting assembly, which includes a horizontal plate 107, a left connecting frame 108 and a right connecting frame 109 located on the top of the horizontal plate 107, and the horizontal plate 107 drives the object to be lifted through the hooks 114 on both sides, and the left connecting frame 108 and the right connecting frame 109 are connected with a first connecting shaft 110 inside, and the lifting wheel 111 and the upper pulley 112 are coaxially arranged through the first connecting shaft 110, and the lifting wheels 111 are rotatably connected at both ends of the first connecting shaft 110, and the steel wire rope passes through the bottom of the lifting wheel 111, and the middle of the first connecting shaft 110 The left connecting frame 108 and the right connecting frame 109 drive the horizontal plate 107 to move up and down through the tension rod 118, the hydraulic rod 120 and the support rope 116. The two ends of the horizontal plate 107 are connected with fixed blocks 113, and the fixed blocks 113 are connected with hooks 114. The two ends of the fixed blocks 113 are rotatably connected with the lower pulley 115. The outer annular surfaces of the upper pulley 112 and the lower pulley 115 are connected with the support rope 116. The bearing capacity of the horizontal plate 107 is distributed to the left connecting frame 108 and the right connecting frame 109 through the tension rod 118, the hydraulic rod 120 and the support rope 116, so as to improve the bearing capacity.

[0054] refer to Figure 3 The bottom of the left connecting frame 108 and the right connecting frame 109 are both connected with a second connecting shaft 117, and the second connecting shaft 117 is used to connect the tension rod 118 and the hydraulic rod 120 to the left connecting frame 108 or the right connecting frame 109. The middle part of the second connecting shaft 117 is connected with the tension rod 118, and the bottom of the tension rod 118 is rotatably connected with the first rotating table 119. The two ends of the second connecting shaft 117 are connected with the hydraulic rod 120, and the bottom of the hydraulic rod 120 is connected with the second rotating table 121. The first rotating table 119 is used to rotate the tension rod 118, and the second rotating table 121 is used to rotate the hydraulic rod 120. The first rotating table 119 and the second rotating table 121 are connected to the top of the horizontal plate 107.

[0055] After long-term use, the lifting device will inevitably become stuck or even stuck, which will affect the safety of lifting goods. The following provides a structure that can keep the lifting object stable when the driving device on one side fails: Reference Figures 3 to 9Specifically, the tops of the left connecting frame 108 and the right connecting frame 109 are connected with fan-shaped support frames 401 arranged in opposition, and an unlocking bracket 404 is connected between the fan-shaped support frames 401, and a first oil chamber 405 with openings at both ends is provided inside the unlocking bracket 404, and lifting rods 406 are slidably connected at both ends of the first oil chamber 405. When the wire rope is in a taut state, the lifting rod 406 will be pressed into the first oil chamber 405, and one end of the lifting rod 406 is rotatably connected with a roller 403 in contact with the lifting wire rope, and the two lifting rods 406 are connected by a spring. Specifically, as the hoisted object rises, when the lifting system on one side becomes stuck or fails, the wire rope on this side becomes loose, and the lifting rod 406 extends out from the first oil chamber 405, so that the hydraulic oil of each branch oil circuit enters the first oil chamber 405;

[0056] The bottom of the transverse plate 107 is connected to an oil storage tank 307, and one side of the oil storage tank 307 is connected to multiple groups of connecting components 308. The connecting components 308 are provided with multiple groups, and by connecting to different oil pipelines, the function of controlling the on and off of different oil circuits is achieved. An oil pipeline is connected between the connecting component 308 and the hydraulic rod 120, and a sixth oil chamber 311 is provided inside the connecting component 308. An oil pipeline is connected between the sixth oil chamber 311 and the first oil chamber 405. The transverse plate 107 is symmetrically provided with left and right slideways 211, and the second rotating platform 121 is symmetrically slidably connected in the slideway 211. The second rotating platform 121 at the bottom of the left connecting frame 108 and the right connecting frame 109 is located on both sides of the slideway 211;

[0057] The tension rod 118 includes a fixed rod 407 and a movable rod 408 sleeved on one end of the fixed rod 407, the outer portion of the movable rod 408 is slidably connected to a movable ring 409, and the movable ring 409 is slidably connected to a first clamping block 411 that passes through the movable rod 408 and is inserted into the fixed rod 407, and the first clamping block 411 connects the movable rod 408 and the fixed rod 407. When the lifting system on one side fails, the hydraulic rod 120 and the tension rod 118 on the other side will be started to form an isosceles triangle, thereby driving the suspended object to move. For example, when there is a problem with the lifting system on the right connecting frame 109, the tension rod 118 and the hydraulic rod 120 at the bottom of the left connecting frame 108 are started to form an isosceles triangle, and the tension rod 118 and the hydraulic rod 120 of the right connecting frame 109 lose their supporting function and shorten inward at the same time to avoid affecting the normal support of the support rope 116. Refer to the figure before and after deformation. Fig.13 .

[0058] Specifically, the hydraulic rod 120 includes an inner rod 201 and an outer tube 202 sleeved on the outer wall of the inner rod 201, one end of the inner rod 201 located in the outer tube 202 is connected to a partition 203, the top of the outer tube 202 is connected to a pressure plate 204 in contact with the outer wall of the inner rod 201, when the hydraulic rod 120 is extended, the partition 203 at the bottom of the inner rod 201 will come into contact with the pressure plate 204, thereby forming a whole, specifically, when the hydraulic rod 120 is fully extended, the length of the hydraulic rod 120 is the same as the length of the tension rod 118, the bottom of the outer tube 202 is connected to a rotating support block 205, the rotating support block 205 is rotatably connected to the second rotating platform 121, and the interior of the rotating support block 205 is provided with a third mutually connected The oil chamber 206 and the arc-shaped oil chamber 207, the third oil chamber 206 and the connecting component 308 are connected with an oil pipeline, and the hydraulic rod 120 is driven by the hydraulic oil in the oil storage tank 307 to move, and the third oil chamber 206 is connected to the inside of the outer tube 202. Specifically, the second rotating table 121 is located at one-third of the entire horizontal plate 107, and the tension rod 118 connected by the second connecting shaft 117 is connected to two-thirds of the horizontal plate 107. When the hydraulic rod 120 is extended, the hydraulic rod 120, the tension rod 118 and the bottom horizontal plate 107 form an isosceles triangle, and the left connecting frame 108 or the right connecting frame 109 connected to the tension rod 118 and the hydraulic rod 120 is located at the top of the isosceles triangle, so that the entire horizontal plate 107 remains balanced;

[0059] When the hydraulic rod 120 is extended, it needs to be rotated synchronously to achieve the effect of rapid prototyping. The following provides a structure for driving the hydraulic rod 120 to rotate: Figure 4 and Figure 5 , an annular groove 208 is provided on one side of the rotating support block 205, a circular plate 209 is rotatably connected in the annular groove 208, and a baffle 210 extending into the arc-shaped oil chamber 207 is connected to one side of the circular plate 209. When the hydraulic oil enters the arc-shaped oil chamber 207, it will hit the baffle 210, and the baffle 210 is fixed to the first rotating platform 119 through the circular plate 209. The reaction force pushes the hydraulic rod 120 to rotate, thereby increasing the molding speed. The circular plate 209 is fixedly connected to the inner ring surface of the second rotating platform 121. When the lifting system on one side fails, the hydraulic rod 120 and the tension rod 118 on the other side will start, thereby forming an isosceles triangle, and a good lifting system is used to drive the object to move;

[0060] When the lifting device on one side drives the entire structure to move, the right connecting frame 109 or the left connecting frame 108 on the other side will affect the formed isosceles triangle. The following structure is provided to avoid the impact: Figure 3 and Figure 4, multi-section hydraulic push rods 212 are connected to both ends of the slide 211, one end of the multi-section hydraulic push rod 212 is connected to the second rotating table 121, when the multi-section hydraulic push rod 212 is started, the extended end pushes the second rotating table 121 to move to the middle area of ​​the slide 211, a fourth oil chamber 213 is provided between the pressure plate 204 and the partition 203, the multi-section hydraulic push rod 212 and the fourth oil chamber 213 are connected through an oil pipeline, the fourth oil chamber 213 is filled with hydraulic oil, when the inner rod 201 extends from the outer tube 202, the fourth oil chamber 213 at the top of the partition 203 becomes smaller, and the internal hydraulic oil is squeezed into the multi-section hydraulic push rod 212 on the other side, so that the multi-section hydraulic push rod 212 on the other side pushes the middle position of the second rotating table 121 to move, so that the hydraulic rod 120 and the multi-section hydraulic push rod 212 perform synchronous movements.

[0061] Since it is located on the lifting device, it is not convenient to install an electric drive structure to drive the hydraulic oil to move. The following provides a structure that can drive the hydraulic oil to move without using electric drive: Fig. 9 Specifically, the interior of the fixed block 113 is connected with an annular oil pipe 303, and a piston plate 304 is penetrated inside the annular oil pipe 303. The inner annular surface of the piston plate 304 is connected with a central tube 305 that penetrates the movable annular oil pipe 303. When an object is suspended at the bottom of the hook 114, the weight will act on the piston plate 304 through the hook 114, and the hydraulic oil in the oil storage tank 307 is transported to the corresponding third oil chamber 206 and the fifth oil chamber 301 by extrusion. A second oil chamber 306 is formed between the annular oil pipe 303 and the piston plate 304. The top of the hook 114 is connected to the central tube 305. An oil pipeline is connected between the oil storage tank 307 and the second oil chamber 306.

[0062] When the hydraulic rod 120 and the tension rod 118 form an isosceles triangle, the hydraulic oil in the arc-shaped oil chamber 207 of the hydraulic rod 120 remains stable. The tension rod 118 also needs a structure that can maintain stability. The following provides a structure for maintaining the stability of the tension rod 118: Figure 8 A fifth oil chamber 301 is provided inside the first rotating table 119, and an extension rod 302 arranged toward the tension rod 118 is slidably connected inside the fifth oil chamber 301. The fifth oil chamber 301 is connected to the same oil supply device through an oil pipeline and the third oil chamber 206, so as to rotate synchronously. When the extension rod 302 is extended, it pushes the tension rod 118 to rotate. An oil pipeline is connected between the fifth oil chamber 301 and the connecting component 308.

[0063] As the hoisted object rises, when the lifting system on one side becomes stuck or fails, the lifting rod 406 in the unlocking bracket 404 will produce a corresponding action. At this time, the lifting wire rope needs to be fixed. The following provides a structure for the lifting rod 406 to cooperate with each other: Figure 7 Specifically, the two ends of the fan-shaped support frame 401 are connected with symmetrically arranged fixed brackets 402, and the symmetrically arranged fixed brackets 402 are located on both sides of the unlocking bracket 404. The fixed bracket 402 is rotated toward one end of the lifting wire rope and is connected with a roller 403. The roller 403 is used to come into contact with the wire rope to avoid direct contact with the lifting wire rope. The lifting wire rope passes between the fixed bracket 402 and the unlocking bracket 404.

[0064] When the second rotating platform 121 moves to the middle position of the slideway 211, the hydraulic rod 120 drives the tension rod 118 to rotate, thereby affecting the support structure on the other side. The following provides a structure for shortening the length of the tension rod 118: Figure 7 and Figure 8 Specifically, a spring is connected between the movable ring 409 and the fixed rod 407, and the spring is in a compressed state. A spring is connected to the top of the fixed rod 407 and the movable rod 408, and the spring is in a stretched state. When the movable ring 409 loses the fixation of the first clamping block 411, the movable rod 408 will be sleeved on the fixed rod 407 due to the action of the spring. A first unlocking cavity 410 is opened in the movable ring 409, and the first clamping block 411 is slidably connected to the first unlocking cavity 410. A spring is connected between the first clamping block 411 and the first unlocking cavity 410. The first clamping block 411 passes through the movable rod 408 and is inserted into the fixed rod 407. Specifically, when When the first clamping block 411 in the movable ring 409 is retracted into the first unlocking chamber 410, the spring will push the movable ring 409 to move to the top of the movable rod 408, and then the movable rod 408 is pulled by the spring between the fixed rod 407, so that it is sleeved on the fixed rod 407, thereby shortening the overall length of the tension rod 118. The first unlocking chamber 410 and the first oil chamber 405 are connected by an oil pipeline. Specifically, when the first oil chamber 405 expands, the hydraulic oil in the first unlocking chamber 410 will enter the first oil chamber 405, thereby driving the first clamping block 411 to be pulled out from the fixed rod 407 and the movable rod 408, and lose the connection with the movable rod 408;

[0065] When the second connecting shaft 117 drives the horizontal plate 107 to move through the hydraulic rod 120 and the tension rod 118, the second rotating platform 121 slides in the slideway 211 and displacement occurs. The following provides a structure for fixing the second rotating platform 121: Figure 7, multiple positioning components 412 are connected to both sides of the cross plate 107, and a positioning hole matching the positioning component 412 is opened on one side of the second rotating table 121. Preferably, there are three positioning components 412, and the positioning components 412 at both ends are connected to the first oil chamber 405 through an oil pipeline. When the positioning components 412 at both ends are unlocked, the second rotating table 121 can be pushed to the position of the middle positioning component 412 by the multi-section hydraulic push rod 212, and then the second rotating table 121 is fixed by the middle positioning component 412, and a reset handle 413 is connected to the middle positioning component 412.

[0066] The specific structure of the positioning component 412 is provided below: Figure 6 Specifically, the connecting component 308 includes a switch support block 309, and a liquid flow channel 310 and a sixth oil chamber 311 are provided inside the switch support block 309. The hydraulic oil in the oil storage tank 307 enters the oil pipeline after passing through the liquid flow channel 310, thereby moving toward each oil chamber. The liquid flow channel 310 is connected between the oil storage tank 307 and the oil pipeline. A fluid piston 312 is slidably connected in the sixth oil chamber 311. A spring is connected between the fluid piston 312 and the sixth oil chamber 311. The spring is in a stretched state. When the space of the first oil chamber 405 becomes larger, the hydraulic oil in the sixth oil chamber 311 will enter the first oil chamber 405. A hole groove for inserting the fluid piston 312 is provided on the side wall of the liquid flow channel 310. An oil pipeline is connected between the sixth oil chamber 311 and the first oil chamber 405, and the on-off of the liquid flow channel 310 is controlled by the first oil chamber 405.

[0067] The first oil chamber 405 on the left connecting frame 108 is connected to the sixth oil chamber 311 of the right connecting frame 109 through an oil pipeline. The first oil chamber 405 on the right connecting frame 109 is connected to the sixth oil chamber 311 of the left connecting frame 108 through an oil pipeline. Specifically, when the first oil chamber 405 on the left connecting frame 108 becomes larger, the connecting component 308 on the right connecting frame 109 is unlocked, so that the hydraulic oil in the oil storage tank 307 enters the tension rod 118 and the hydraulic rod 120 at the bottom of the right connecting frame 109, so as to form an isosceles triangle, and vice versa.

[0068] When the support rope 116 changes from a trapezoid to a triangle, the support rope 116 becomes loose. The following provides a structure for keeping the support rope 116 in a taut state: Figure 7 and Figure 8Specifically, elastic brackets 501 are connected to the tops of both ends of the horizontal plate 107, and elastic rods 502 are slidably connected inside the elastic brackets 501. A spring is connected between the elastic rod 502 and the elastic bracket 501. The spring is in a compressed state, pushing the elastic rod 502 to extend outward, and the elastic roller 503 at the end will come into contact with the support rope 116, thereby keeping the support rope 116 in a taut state. The top of the elastic rod 502 is connected to an elastic roller 503 in contact with the support rope 116, and the elastic bracket 50 1 is connected with a positioning assembly 412, through which the elastic rod 502 can only extend outward, so as to keep the support rope 116 in a taut state, so that the support rope 116 can play a supporting role, and the top of the elastic rod 502 is provided with an inclined tooth surface 504 corresponding to the positioning assembly 412, the tooth tip of the inclined tooth surface 504 faces downward, and the tooth tip of the positioning block 505 in the positioning assembly 412 faces upward, and cooperates with the inclined tooth surface 504, and the top of the positioning assembly 412 is connected with a reset handle 413;

[0069] The positioning assembly 412 includes a locking block 506, and a positioning block 505 is slidably connected to the locking block 506. The positioning block 505 in the positioning assembly 412 located in the middle of the slide 211 cooperates with the positioning hole on the second rotating table 121, and inclined surfaces are provided on both sides so that when the second rotating table 121 moves to this place, it can be smoothly inserted into the positioning hole. A spring is connected between the positioning block 505 and the inner wall of the locking block 506, and the positioning block 505 cooperates with the positioning hole and the inclined tooth surface 504 to achieve the effect of positioning and fixing.

[0070] When the first moving trolley 102 and the second moving trolley 103 lift the same object, two driving devices are usually used to drive them to move respectively. However, due to wear and other conditions, asynchronous movement may occur, resulting in the distance between the two trolleys becoming larger or smaller, thereby affecting the stability during lifting. The following provides a synchronous drive structure: Fig.10 and Fig.11Specifically, the traction device 105 includes a reducer 601, a rotating shaft 602 located at the output end of the reducer 601, the outer ring surface of the rotating shaft 602 is rotatably connected to a first roller 603 and a second roller 604 located at both ends of the first roller 603, the first roller 603 drives the first moving trolley 102 to move through a wire rope, and the second roller 604 drives the second moving trolley 103 to move through a wire rope, the inner ring surface of the first roller 603 and the second roller 604 at one end opposite to each other is provided with an inner spline portion 605, and the rotating shaft 602 is provided with The outer spline part 606 corresponding to the inner spline part 605, the inner spline part 605 and the outer spline part 606 are slidably connected with a spline block 607, and the movement of the spline block 607 realizes simultaneous control or separate control of the first roller 603 and the second roller 604. The spline block 607 is spline-connected with the inner spline part 605 and the outer spline part 606. Specifically, when the spline block 607 completely enters the first roller 603, the other end of the spline block 607 will be separated from the second roller 604, and the control ability of the second roller 604 will be lost, and vice versa;

[0071] The following provides a structure for driving the spline block 607 to move: Fig.11 and Fig.12 A fixed plate 608 is provided at the bottom of the first roller 603 and the second roller 604, and a support frame is connected to the top of the fixed plate 608. The rotating shaft 602 is rotatably connected to the support frame. A hydraulic cylinder 609 is connected to the top of the support frame, and a push plate 610 is pushed to move by the hydraulic cylinder 609. The protruding end of the hydraulic cylinder 609 is connected to the push plate 610, and a ramp block 611 is connected to the bottom of the push plate 610. The bottom of the ramp block 611 is rotatably connected to the spline block 607. Specifically, the rotating shaft 602 drives the first roller 603 and the second roller 604 to rotate or rotate simultaneously through the spline block 607.

[0072] When the first roller 603 or the second roller 604 is controlled separately, the other roller that is not rotating needs to be fixed to prevent it from rotating. The following provides a structure that can automatically brake and fix after being separated from the spline block 607: Fig.11 and Fig.12Specifically, the fixed plate 608 is fixedly connected to the top of the supporting platform 104, and the two ends of the outer annular surfaces of the first roller 603 and the second roller 604 are connected with brake ring plates 612. The bottom of the fixed plate 608 is rotatably connected with a brake arm 613, and the brake arm 613 moves toward the brake ring plate 612 through a spring, so that the brake pad 614 comes into contact with the brake ring plate 612, thereby braking the first roller 603 or the second roller 604. The middle part of the brake arm 613 is rotatably connected with a brake pad 614 that contacts the brake ring plate 612. The fixed plate 608 and the brake A spring is connected between the car arms 613, and the top of the brake arm 613 is rotatably connected to the roller 403. Inclined surfaces for moving the roller 403 are provided on both sides of the inclined plane block 611. Specifically, when the spline block 607 is connected to the second roller 604 and the first roller 603 at the same time, the brake arms 613 on both sides are opened at the same time. When the spline block 607 contacts the second roller 604 and disengages from the first roller 603, the top of the brake arm 613 on one side of the first roller 603 is disengaged from the inclined plane block 611, and moves toward the brake ring plate 612 with the brake pad 614, thereby fixing the first roller 603.

[0073] When the present invention is in use, the boom 101 rotates through the slewing support seat at the bottom, the traction device 105 drives the first moving trolley 102 and the second moving trolley 103 on the guide rail to move through the wire rope, and the hoisting winch 106 at the other end of the boom 101 drives the left connecting frame 108 and the right connecting frame 109 to rise and fall through the wire rope. The hooks 114 at both ends of the cross plate 107 are used to connect with the objects to be hoisted, so as to complete the hoisting operation. When a problem occurs in a certain lifting system, the tension rod 118 and the hydraulic rod 120 on the other side are extended to form an isosceles triangle. Fig.13 , changing the lifting point from one corner of the quadrilateral to the top of the triangle, so that stable lifting operations can be performed through this side, while the tension rod 118 and the hydraulic rod 120 on the other side are retracted to avoid affecting the lifting action at the other end.

[0074] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A double lifting system crane trolley, comprising a first moving trolley (102) and a second moving trolley (103) slidably connected to a boom (101), characterized in that: A guide rail is connected to the inner side of one end of the boom (101); the first moving trolley (102) and the second moving trolley (103) are slidably connected to the guide rail; a support platform (104) is connected to the inner side of the end of the boom (101) close to the guide rail; a traction device (105) is connected to the support platform (104); a traction wire rope is wound around the traction device (105); the traction wire rope is connected to the first moving trolley (102) and the second moving trolley (103); and a hoisting winch (106) is connected to the top of the end of the boom (101) away from the guide rail; The hoisting winch (106) is connected to a lifting wire rope, and the lifting wire rope is connected to a lifting assembly, and the lifting assembly includes a transverse plate (107), a left connecting frame (108) and a right connecting frame (109) located above the transverse plate (107), and the left connecting frame (108) and the right connecting frame (109) are both connected to a first connecting shaft (110) inside, and both ends of the first connecting shaft (110) are rotatably connected to a lifting wheel (111). The lifting wire rope is connected to the lifting winch (106) from the lifting winch (106). The bottom of the hanging wheel (111) passes through, the middle of the first connecting shaft (110) is connected to two symmetrically distributed upper pulleys (112), the two ends of the horizontal plate (107) are connected to symmetrically arranged fixing blocks (113), the fixing blocks (113) are connected to hooks (114), the front and rear ends of the fixing blocks (113) are rotatably connected to the lower pulley (115), and the outer annular surfaces of the upper pulley (112) and the lower pulley (115) are wound with closed support ropes (116); The bottom of the left connecting frame (108) and the bottom of the right connecting frame (109) are both connected to a second connecting shaft (117); the outer ring surface of the second connecting shaft (117) is rotatably connected to a tension rod (118) and a hydraulic rod (120); the bottom of the tension rod (118) is rotatably connected to a first rotating platform (119); the bottom of the hydraulic rod (120) is connected to a second rotating platform (121); the first rotating platform (119) and the second rotating platform (121) are connected to the top of the horizontal plate (107).

2. The double lifting system crane trolley according to claim 1, characterized in that: The tops of the left connecting frame (108) and the right connecting frame (109) are connected with fan-shaped support frames (401) arranged in opposition, and an unlocking bracket (404) is connected between the fan-shaped support frames (401), and a first oil chamber (405) with openings at both ends is provided inside the unlocking bracket (404), and both ends of the first oil chamber (405) are slidably connected with a lifting rod (406), and one end of the lifting rod (406) is rotatably connected with a roller (403) in contact with the lifting wire rope, and the two lifting rods (406) are connected by a spring; The bottom of the transverse plate (107) is connected to an oil storage tank (307), one side of the oil storage tank (307) is connected to a plurality of connecting components (308), an oil pipeline is connected between the connecting component (308) and the hydraulic rod (120), a sixth oil chamber (311) is provided inside the connecting component (308), an oil pipeline is connected between the sixth oil chamber (311) and the first oil chamber (405), and slideways (211) are symmetrically provided on the transverse plate (107), and the second rotating platform (121) is symmetrically slidably connected in the slideways (211); The tension rod (118) comprises a fixed rod (407) and a movable rod (408) sleeved on one end of the fixed rod (407); the movable rod (408) is slidably connected to a movable ring (409) on the outside; the movable ring (409) is slidably connected to a first clamping block (411) that passes through the movable rod (408) and is inserted into the fixed rod (407); the first clamping block (411) connects the movable rod (408) and the fixed rod (407).

3. The double lifting system crane trolley according to claim 2, characterized in that: The hydraulic rod (120) comprises an inner rod (201) and an outer tube (202) sleeved on the outer wall of the inner rod (201); one end of the inner rod (201) located inside the outer tube (202) is connected to a partition (203); the top of the outer tube (202) is connected to a pressure plate (204) in contact with the outer wall of the inner rod (201); the bottom of the outer tube (202) is connected to a rotation support block (205); the rotation support block (205) is rotationally connected to the second rotating platform (121); a third oil chamber (206) and an arc-shaped oil chamber (207) which are connected to each other are provided inside the rotation support block (205); an oil pipeline is connected between the third oil chamber (206) and the connecting component (308); the third oil chamber (206) is connected to the inside of the outer tube (202); An annular groove (208) is formed on one side of the rotating support block (205), a circular plate (209) is rotatably connected in the annular groove (208), a baffle (210) extending into the arc-shaped oil chamber (207) is connected to one side of the circular plate (209), and the circular plate (209) is fixedly connected to the inner annular surface of the second rotating platform (121); Both ends of the slideway (211) are connected to a multi-section hydraulic push rod (212), one end of the multi-section hydraulic push rod (212) is connected to the second rotating platform (121), a fourth oil chamber (213) is provided between the pressure plate (204) and the partition (203), and the multi-section hydraulic push rod (212) and the fourth oil chamber (213) are connected via an oil pipeline.

4. The double lifting system crane trolley according to claim 2, characterized in that: The interior of the fixed block (113) is connected to an annular oil pipe (303), a piston plate (304) is inserted into the interior of the annular oil pipe (303), the inner annular surface of the piston plate (304) is connected to a central pipe (305) penetrating the movable annular oil pipe (303), a second oil chamber (306) is formed between the annular oil pipe (303) and the piston plate (304), the top of the hook (114) is connected to the central pipe (305), and an oil pipeline is connected between the oil storage tank (307) and the second oil chamber (306); A fifth oil chamber (301) is provided inside the first rotating table (119), and an extension rod (302) arranged toward the tension rod (118) is slidably connected inside the fifth oil chamber (301). When the extension rod (302) is extended, it pushes the tension rod (118) to rotate, and an oil pipeline is connected between the fifth oil chamber (301) and the connecting component (308).

5. The double lifting system crane trolley according to claim 2, characterized in that: The two ends of the fan-shaped support frame (401) are connected to symmetrically arranged fixed brackets (402), and the symmetrically arranged fixed brackets (402) are located on both sides of the unlocking bracket (404). The fixed bracket (402) is connected to a roller (403) that rotates toward one end of the lifting wire rope, and the lifting wire rope passes between the fixed bracket (402) and the unlocking bracket (404).

6. The double lifting system crane trolley according to claim 2, characterized in that: A spring is connected between the movable ring (409) and the fixed rod (407), a spring is connected between the fixed rod (407) and the top of the movable rod (408), a first unlocking chamber (410) is provided in the movable ring (409), the first clamping block (411) is slidably connected in the first unlocking chamber (410), a spring is connected between the first clamping block (411) and the first unlocking chamber (410), the first clamping block (411) passes through the movable rod (408) and is inserted into the fixed rod (407), and the first unlocking chamber (410) and the first oil chamber (405) are connected via an oil pipeline; A plurality of positioning components (412) are connected to both sides of the transverse plate (107); a positioning hole matching the positioning components (412) is provided on one side of the second rotating platform (121); the positioning components (412) at both ends are connected to the first oil chamber (405) via an oil pipeline; and a reset handle (413) is connected to the middle positioning component (412).

7. The double lifting system crane trolley according to claim 6, characterized in that: The connecting component (308) comprises a switch support block (309), the switch support block (309) is provided with a liquid flow channel (310) and a sixth oil chamber (311) inside, the liquid flow channel (310) is connected between the oil storage tank (307) and the oil pipeline, a fluid piston (312) is slidably connected inside the sixth oil chamber (311), a spring is connected between the fluid piston (312) and the sixth oil chamber (311), a hole groove for inserting the fluid piston (312) is provided on the side wall of the liquid flow channel (310), and an oil pipeline is connected between the sixth oil chamber (311) and the first oil chamber (405); The first oil chamber (405) on the left connecting frame (108) is connected to the sixth oil chamber (311) of the right connecting frame (109) via an oil pipeline, and the first oil chamber (405) on the right connecting frame (109) is connected to the sixth oil chamber (311) of the left connecting frame (108) via an oil pipeline.

8. The double lifting system crane trolley according to claim 7, characterized in that: The tops of both ends of the transverse plate (107) are connected to elastic brackets (501), an elastic rod (502) is slidably connected inside the elastic bracket (501), a spring is connected between the elastic rod (502) and the elastic bracket (501), the top of the elastic rod (502) is connected to an elastic roller (503) in contact with a support rope (116), the elastic bracket (501) is connected to a positioning assembly (412), the top of the elastic rod (502) is provided with an inclined tooth surface (504) corresponding to the positioning assembly (412), and the top of the positioning assembly (412) is connected to a reset handle (413); The positioning assembly (412) comprises a locking block (506), a positioning block (505) being slidably connected inside the locking block (506), a spring being connected between the positioning block (505) and the inner wall of the locking block (506), and the positioning block (505) being matched with the positioning hole and the inclined tooth surface (504).

9. The double lifting system crane trolley according to claim 1, characterized in that: The traction device (105) comprises a reducer (601), a rotating shaft (602) located at the output end of the reducer (601), the outer annular surface of the rotating shaft (602) being rotatably connected to a first roller (603) and second rollers (604) located at both ends of the first roller (603), inner annular surfaces of opposite ends of the first roller (603) and the second roller (604) being provided with an inner spline portion (605), an outer spline portion (606) corresponding to the inner spline portion (605) being provided on the rotating shaft (602), a spline block (607) being slidably connected between the inner spline portion (605) and the outer spline portion (606), and the spline block (607) being spline-connected to the inner spline portion (605) and the outer spline portion (606); A fixing plate (608) is provided at the bottom of the first roller (603) and the second roller (604); the top of the fixing plate (608) is connected to a support frame; the rotating shaft (602) is rotatably connected to the support frame; the top of the support frame is connected to a hydraulic cylinder (609); the protruding end of the hydraulic cylinder (609) is connected to a push plate (610); the bottom of the push plate (610) is connected to an inclined surface block (611); and the bottom of the inclined surface block (611) is rotatably connected to the spline block (607).

10. The double lifting system crane trolley according to claim 9, characterized in that: The fixed plate (608) is fixedly connected to the top of the supporting platform (104); the outer annular surfaces of the first roller (603) and the second roller (604) are connected with brake ring plates (612) at both ends; the bottom of the fixed plate (608) is rotatably connected to a brake arm (613); the middle of the brake arm (613) is rotatably connected to a brake plate (614) in contact with the brake ring plate (612); a spring is connected between the fixed plate (608) and the brake arm (613); the top of the brake arm (613) is rotatably connected to a roller (403); and inclined surfaces for the roller (403) to move are provided on both sides of the inclined surface block (611).

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