Chain type lifting device

Abstract

The embodiment of the utility model provides a chain type lifting device. The chain type lifting device comprises a main machine frame body, a lifting frame connected to the interior of the main machine frame body in a sliding mode and a chain driving assembly used for driving the lifting frame to vertically ascend and descend. The chain driving assembly comprises two transmission shafts which are rotationally connected to the main frame body and are symmetrically distributed, and a driving device for driving the two transmission shafts to synchronously rotate; driving chain wheels are assembled at the two ends of each transmission shaft, driven chain wheels are rotationally connected to the lower portion of the main machine frame body, first chains are connected between the driving chain wheels and the corresponding driven chain wheels, and the four first chains are connected with the lifting frame in a pairwise opposite mode. The chain type lifting device further comprises counterweight assemblies, and the counterweight assemblies are oppositely distributed on the two sides of the lifting frame or distributed at the four corners of the lifting frame in a rectangular mode. Chain type driving is adopted in the whole lifting device, the synchronization effect is improved, multi-directional synchronous lifting power output is completed through a single motor, and the motor load is reduced through the balance weight assembly.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of tire detection and lifting, and particularly relates to a chain type lifting device. BACKGROUND

[0002] An engineering tire X-ray inspection machine is used for detecting the quality of engineering tires, and can detect whether defects exist in the internal structure of the tire. The engineering tire X-ray inspection machine is composed of a main machine (the main machine is wrapped by a radiation protection room) and a conveying trolley. The conveying trolley conveys the tire into the main machine, a lifting frame is lowered, and a rotating shaft of a lifting arm on the lifting frame is extended into the inside of a tire sub-opening, and then the tire is lifted. The lifting arm is synchronously moved outward to expand the sub-opening, and at the same time, the tire is located at the center of the main machine. The tire continues to rise to a set detection position. The existing lifting device adopts a screw rod and a gear to realize stable adjustment of the height of the lifting frame. The lifting power is derived from two variable frequency motors, and it is difficult to synchronize and the efficiency is slow. Four screw rods for transmission move simultaneously, and the precision of parts matched with the four screw rods is high. The cumulative error of each welded part and processed part easily affects the transmission precision and the service life of a ball screw nut pair. Moreover, the ball screw nut pair needs to be customized, the supply cycle is long, and the cost is high. SUMMARY

[0003] The utility model aims at providing a chain type lifting device, and improving the synchronous lifting effect.

[0004] The application provides a chain type lifting device, which is used for detecting a tire in cooperation with an X-ray inspection machine. The chain type lifting device comprises a main frame body, a lifting frame slidingly connected in the main frame body, and a chain drive assembly for driving the lifting frame to vertically lift, wherein

[0005] The chain drive assembly comprises two transmission shafts which are rotationally connected to the main frame body and symmetrically distributed, and a driving device for driving the two transmission shafts to synchronously rotate.

[0006] Both ends of each transmission shaft are equipped with a driving sprocket, a driven sprocket is rotationally connected to the lower part of the main frame body, a first chain is connected between the driving sprocket and the corresponding driven sprocket, and four first chains are connected with the lifting frame in pairs.

[0007] The chain type lifting device further comprises a counterweight assembly, the counterweight assembly is relatively distributed on both sides of the lifting frame or is rectangularly distributed on four corners of the lifting frame, and when the chain drive assembly drives the lifting frame to vertically lift, a plurality of counterweight assemblies synchronously descend under gravity.

[0008] In the application, single motor is adopted to realize multi-direction synchronous output stable lifting power, chain type conduction lifting power has stable performance, and reduces production cost and manufacturing process, and the overall synchronous performance is good; meanwhile, the counterweight group can reduce motor load and prolong service life.

[0009] In one specific implementation, the driving device comprises a driving motor and a hollow shaft speed reducer connected to the output shaft of the driving motor; wherein,

[0010] Both ends of the hollow shaft speed reducer are connected with output sprockets for driving the two transmission shafts to rotate synchronously.

[0011] In one specific implementation, the middle part of each transmission shaft is equipped with a conduction sprocket, and a second chain is connected between the conduction sprocket and the corresponding output sprocket.

[0012] In one specific implementation, the four corners of the lifting frame are provided with chain supports connected one by one with the four first chains.

[0013] In one specific implementation, when the counterweight assemblies are distributed in the four corners of the lifting frame,

[0014] Each counterweight assembly comprises a counterweight sprocket rotatably connected to the main rack body, a third chain meshingly connected to the counterweight sprocket, and a counterweight block connected to the third chain; wherein,

[0015] The first end of the third chain is fixedly connected to the corresponding chain support, and the second end of the third chain is fixedly connected to the counterweight block.

[0016] In one specific implementation, both ends of the two transmission shafts are rotatably connected to the main rack body through bearings.

[0017] In one specific implementation, the lifting frame is provided with a hoist arm assembly for clamping tires. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 The front view of the chain type lifting device provided by the embodiment of the application is provided.

[0019] Figure 2 The cross-sectional view of the chain type lifting device provided by the embodiment of the application is provided.

[0020] Figure 3 The top view of the chain type lifting device provided by the embodiment of the application is provided. DETAILED DESCRIPTION

[0021] In order to make the purposes, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings.

[0022] It should be noted that, unless otherwise defined, technical terms or scientific terms used in one or more embodiments of the present application should be understood as their common meanings to those skilled in the art to which the present disclosure belongs. The terms "first", "second" and similar terms used in one or more embodiments of the present application do not represent any order, number or importance, but are only used to distinguish different components. The terms "include" or "contain" and similar terms mean that the elements or objects before the terms cover the elements or objects listed after the terms and their equivalents, and do not exclude other elements or objects. The terms "connect" or "connected" and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms "up", "down", "left", "right" and the like are only used to represent relative positional relationships, and when the absolute positions of the described objects change, the relative positional relationships may also change accordingly.

[0023] In order to facilitate the understanding of the chain lifting device provided by the embodiments of the present application, first, the application scenario of the chain lifting device provided by the embodiments of the present application is described. The chain lifting device provided by the embodiments of the present application is applied to X-ray tire detection lifting positioning technology. The lifting power comes from two variable frequency motors, which are difficult to synchronize and slow in efficiency. The simultaneous movement of the four lead screws used for transmission requires high precision of the parts cooperating with them. Therefore, the chain lifting device provided by the embodiments of the present application has good synchronization performance and reduces the manufacturing cost.

[0024] When lifting and positioning the tire, the rotating shaft of the lifting arm on the lifting frame extends into the inside of the tire sub-port and lifts the tire. The lifting arm synchronously moves outward to expand the sub-port, and at the same time, the tire is located at the center of the main machine. The tire continues to rise to the set detection position. The lifting device adopts a lead screw and a gear to mesh transmission to realize stable adjustment of the lifting frame height. The lifting power comes from two variable frequency motors, which are difficult to synchronize and slow in efficiency. The simultaneous movement of the four lead screws used for transmission requires high precision of the parts cooperating with them. In addition, the cumulative error of each welded part and machined part easily affects the transmission precision and the service life of the ball screw nut pair. Moreover, the ball screw nut pair requires special customization, has a long supply cycle and high cost.

[0025] Therefore, the chain lifting device provided by the embodiments of the present application improves the synchronous lifting effect and reduces the manufacturing cost. The chain lifting device will be described in detail below in combination with specific examples.

[0026] Reference Figure 1 is shown in FIG. Figure 1 A front view of the chain lifting device provided by the embodiments of the present application is shown; Figure 2A sectional view of a chain lifting device is shown. The chain lifting device is used to cooperate with an X-ray inspection machine to detect a tire; an engineering tire is relatively heavy, and the X-ray inspection machine is used to detect the quality of the engineering tire, so the lifting device needs to have a relatively stable lifting positioning function, so that it has a good lifting positioning function for the engineering tire. The chain lifting device in the application can greatly meet the lifting synchronization and cooperation, apply the same lifting force in multiple directions, and greatly reduce the production cost and simplify the production process.

[0027] The chain lifting device in the application includes a main rack body 10, which is a detection rack group in the application. The tire is transported to the inside of the main rack body 10 by a trolley. The inside of the main rack body 10 is slidably connected with a lifting frame 20. The lifting frame 20 is oppositely provided with a lifting arm assembly. After the lifting arm assembly is lowered to a low point, the rotating shaft of the lifting arm extends into the inside of the tire sub-port. Then, the lifting frame 20 is raised to lift the tire to a suitable height for detection. The inside of the main rack body 10 is provided with a guide rail along the height direction. The lifting frame 20 is provided with a sliding block matched with the guide rail, so that the stable vertical lifting of the lifting frame 20 can be ensured.

[0028] In the application, the previous combination of precision equipment such as ball screw nut pairs and bevel gears is abandoned, and a chain type stable synchronous lifting frame 20 is adopted. Specifically, the chain lifting device further includes a chain drive assembly for driving the vertical lifting of the lifting frame 20. Figure 3 As shown in the combination, the chain drive assembly includes two transmission shafts 50 rotatably connected to the main rack body 10 and symmetrically distributed, and a driving device for driving the synchronous rotation of the two transmission shafts 50. The transmission shaft 50 is rotatably connected to the top of the main rack body 10 by a bearing, and the two rotating shafts are assembled in a symmetrical distribution manner to ensure that the four points of the lifting frame 20 are under the same lifting force.

[0029] When the driving device is specifically arranged to make the two transmission shafts 50 rotate synchronously, the driving device includes a driving motor 30 and a hollow shaft reducer 40 connected to the output shaft of the driving motor 30. The previous double-motor power source is changed to an 11KW servo motor with a hollow shaft reducer 40 with a reduction ratio of 67.62. The hollow shaft reducer 40 has a double-output shaft structure, which solves the problem of motor synchronization. The two ends of the hollow shaft reducer 40 are both connected with an output sprocket 41 for driving the synchronous rotation of the two transmission shafts 50. The middle part of each transmission shaft 50 is assembled with a transmission sprocket 51. The transmission sprocket 51 and the corresponding output sprocket 41 are connected by a second chain. As can be seen, under the double-output shaft structure of the hollow shaft reducer 40, the two output sprockets 41 installed at the shaft ends are connected to the corresponding transmission sprockets 51 by the second chain, so that the two transmission shafts 50 realize the stable performance of synchronous, same speed and same direction rotation, meeting the synchronous cooperation demand in the lifting process.Figure 1 and Figure 2 As shown in FIGS. 1-2, each of the two ends of the transmission shaft 50 is equipped with a driving sprocket 52, and the lower part of the main rack body 10 is rotatably connected with a driven sprocket 11. The driving sprocket 52 is connected with the corresponding driven sprocket 11 through a first chain 53, and the four first chains 53 are connected with the lifting frame 20 in pairs. The four first chains 53 are distributed in a rectangular shape and fixedly connected with the lifting frame 20, so that the four first chains 53 are synchronously rotated during the rotation of the two transmission shafts 50, and the lifting frame 20 is stably lifted and lowered by the force distribution of the four force points. When the four first chains 53 are connected with the lifting frame 20, chain supports 31 corresponding to the four first chains 53 are arranged at the four corners of the lifting frame 20. The first chain 53 is fixedly connected with the corresponding chain support 31, so that the lifting process is synchronized.

[0030] In addition, in order to further reduce the output load of the driving motor 30, the chain lifting device in the application further comprises a counterweight assembly. The counterweight assembly is distributed on both sides of the lifting frame 20 or on the four corners of the lifting frame 20. When the chain driving assembly drives the lifting frame 20 to vertically rise, the plurality of counterweight assemblies synchronously descend under the action of gravity. In the application, four counterweight assemblies are preferably installed on the four corners of the lifting frame 20 in a rectangular distribution. Of course, in other embodiments of the application, the counterweight assemblies can also be arranged on the middle part of the two sides of the lifting frame 20 in a symmetrical distribution, so as to provide auxiliary load reduction for the driving motor 30 when the lifting frame 20 moves horizontally and vertically.

[0031] For example, when the counterweight assembly is distributed in a rectangular shape on the four corners of the lifting frame 20, each counterweight assembly comprises a counterweight sprocket 12 rotatably connected to the main rack body 10, a third chain 13 meshingly connected to the counterweight sprocket 12, and a counterweight block 14 connected to the third chain 13. The weight of the counterweight block 14 can be selected and installed according to the detected tire weight. The first end of the third chain 13 is fixedly connected to the corresponding chain support 31, and the second end of the third chain 13 is fixedly connected to the counterweight block 14. As can be seen, when the driving motor 30 is in a working state, the hollow shaft reducer 40 drives the two output sprockets 41 to synchronously rotate, and drives the two transmission shafts 50 to synchronously rotate under the action of the two second chains. At this time, the driving sprocket 52 at the two ends of the transmission shaft 50 drives the driven sprocket 11 to rotate under the power transmission of the first chain 53, and the lifting frame 20 is lifted during the synchronous rotation of the four first chains 53. At this time, the lifting frame 20 descends under the action of gravity during the lifting process, the third chain 13 and the counterweight sprocket 12 rotate to provide auxiliary lifting force, and the load of the driving motor 30 is reduced.

[0032] In the application, single motor is used to realize multi-direction synchronous output stable lifting power, chain type conduction lifting power performance is stable, and production cost and manufacturing process are reduced, and the overall synchronous performance is good; meanwhile, the counterweight group can reduce the motor load and prolong the service life.

[0033] One or more embodiments of the present specification are intended to cover all such alternatives, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omission, modification, equivalent replacement, improvement, etc. made in the spirit and principle of one or more embodiments of the present specification should be included in the protection scope of the present disclosure.

[0034] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical range disclosed in the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A chain hoist for use in connection with an X-ray inspection machine for inspecting tyres, characterised in that, The chain type lifting device comprises a main frame body, a lifting frame slidingly connected inside the main frame body, and a chain drive assembly for driving the lifting frame to vertically lift, wherein The chain drive assembly comprises two transmission shafts rotationally connected to the main frame body and symmetrically distributed, and a drive device for driving the two transmission shafts to synchronously rotate. Both ends of each transmission shaft are equipped with a driving sprocket, the lower part of the main frame body is rotationally connected with a driven sprocket, the driving sprocket and the corresponding driven sprocket are connected with a first chain, and the four first chains are connected with the lifting frame in pairs. The chain type lifting device further comprises a counterweight assembly, which is relatively distributed on both sides of the lifting frame or rectangularly distributed on the four corners of the lifting frame; when the chain drive assembly drives the lifting frame to vertically ascend, the plurality of counterweight assemblies synchronously descend under gravity.

2. The chain lift of claim 1, wherein, The drive device comprises a drive motor and a hollow shaft speed reducer connected with the output shaft of the drive motor; wherein Both ends of the hollow shaft speed reducer are shaft-connected with output sprockets for driving the two transmission shafts to synchronously rotate.

3. The chain lift of claim 2, wherein, The middle part of each transmission shaft is equipped with a transmission sprocket, and the transmission sprocket and the corresponding output sprocket are connected with a second chain.

4. The chain lift of claim 1, wherein, The four corners of the lifting frame are each provided with a chain bracket connected in one-to-one correspondence with the four first chains.

5. The chain lift of claim 4, wherein, When the counterweight assembly is rectangularly distributed on the four corners of the lifting frame, Each counterweight assembly comprises a counterweight sprocket rotationally connected to the main frame body, a third chain meshingly connected to the counterweight sprocket, and a counterweight block connected with the third chain; wherein The first end of the third chain is fixedly connected with the corresponding chain bracket, and the second end of the third chain is fixedly connected with the counterweight block.

6. The chain lift of any one of claims 1-5, wherein, Both ends of the two transmission shafts are rotationally connected to the main frame body through bearings.

7. The chain lift of claim 6, wherein, The lifting frame is oppositely provided with a lifting arm assembly for clamping tires.

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