Lifting equipment and grinding system

Abstract

The utility model provides lifting equipment and a polishing system, and the lifting equipment comprises a first-stage lifting device which comprises a first-stage support, a first lifting structure and a driving device for driving the first lifting structure to move up and down; the second-stage lifting device comprises a second-stage support arranged on the first lifting structure and a transmission assembly arranged on the second-stage support, the transmission assembly comprises a transmission synchronous belt, a second lifting structure, a transmission synchronous wheel and a mounting base, and the transmission synchronous wheel is pivotally arranged at the top of the second-stage support; the transmission synchronous belt is arranged on the transmission synchronous wheel in a crossing mode and meshed with the transmission synchronous wheel, one end of the transmission synchronous belt is fixedly connected with the first-stage support, the installation base is fixedly arranged at the other end of the transmission synchronous belt through a second lifting structure, and the transmission synchronous belt is tensioned under the gravity effect of the installation base. According to the technical scheme, the problem that in the prior art, a lifting device cannot meet the requirements for lifting height and passing height at the same time can be effectively solved.

Description

Technical Field

[0001] The utility model relates to the field of lifting devices, and in particular to a lifting device and a grinding system. Background Art

[0002] During the house construction stage, the degree of automation in the construction of architectural paint scraping and surface grinding on the wall and ceiling areas is low. Various types of architectural paint spraying and grinding equipment are available on the market, but manual handheld equipment is still required to complete the operation. If the overall spraying or grinding operation is to be achieved, a lifting device with a certain lifting height is required, but the lifting equipment is usually limited by the height of the door frame during the transfer process within the building. The existing lifting devices basically cannot meet the requirements of lifting height and traffic height at the same time. Utility Model Content

[0003] The main purpose of the utility model is to provide a lifting device and a grinding system to solve the problem that the lifting device in the prior art cannot simultaneously meet the requirements of the lifting height and the passing height.

[0004] In order to achieve the above-mentioned purpose, according to one aspect of the utility model, a lifting device is provided, including: a first-level lifting device, including a fixed first-level bracket, a first lifting structure movably arranged on the first-level bracket, and a driving device for driving the first lifting structure to move; a second-level lifting device, including a second-level bracket arranged on the first lifting structure and a transmission assembly arranged on the second-level bracket, the transmission assembly including a transmission synchronous belt, a second lifting structure, a transmission synchronous wheel and a mounting seat, the transmission synchronous wheel is pivotally arranged on the top of the second-level bracket, the transmission synchronous belt is straddled on the transmission synchronous wheel and meshed with the transmission synchronous wheel, one end of the transmission synchronous belt is fixedly connected to the first-level bracket, the mounting seat is fixedly arranged on the other end of the transmission synchronous belt through the second lifting structure, and the transmission synchronous belt is tensioned under the gravity of the mounting seat.

[0005] In one embodiment, the secondary lifting device also includes a mounting seat guide structure, which includes a first guide rail arranged on the secondary bracket and extending up and down, and a first slider movably arranged on the first guide rail, and the mounting seat is fixedly connected to the first slider.

[0006] In one embodiment, the first-stage lifting device also includes: lifting synchronous wheels pivotally arranged at the upper and lower ends of the first-stage bracket and a lifting transmission belt sleeved on the two lifting synchronous wheels, the lifting transmission belt meshes with the lifting synchronous wheels, the first lifting structure is fixedly connected to the lifting transmission belt, and the driving device is a driving motor connected to one of the lifting synchronous wheels.

[0007] In one embodiment, the first-stage lifting device also includes: a lifting guide structure, the lifting guide structure includes a second guide rail arranged on the first-stage bracket and extending up and down, and a second slider movably arranged on the second guide rail, and the second-stage bracket is fixedly connected to the second slider.

[0008] In one embodiment, the secondary lifting device also includes a mounting seat guide structure, the mounting seat guide structure includes a first guide rail arranged on the secondary bracket and extending up and down, and a first slider movably arranged on the first guide rail, and the mounting seat is fixedly connected to the first slider; wherein, the primary bracket has a first mounting surface for mounting the lifting guide structure, and the secondary bracket has a second mounting surface for mounting the mounting seat guide structure, and the first mounting surface is parallel to the second mounting surface.

[0009] In one embodiment, the first-level bracket includes a bracket body and a mounting shaft seat for mounting an upper lifting synchronous wheel, and one end of the transmission synchronous belt is fixedly connected to the mounting shaft seat.

[0010] In one embodiment, the axes of the lifting synchronous wheel and the transmission synchronous wheel are parallel, and the projection of the perpendicular bisector of the lifting synchronous wheel on the first installation surface coincides with the projection of the perpendicular bisector of the transmission synchronous wheel on the first installation surface.

[0011] In one embodiment, the lifting device further comprises an accordion cover, which comprises two guide plates arranged opposite to each other and an accordion expansion plate between the two guide plates, the accordion expansion plate is provided with an avoidance opening for avoiding the mounting seat, and the accordion expansion plate expands and contracts with the movement of the mounting seat.

[0012] In one embodiment, the first lifting structure and / or the second lifting structure is a synchronous belt pressure plate, and the synchronous belt pressure plate includes a pressure plate seat and a pressure plate cover that are interlocked, and the pressure plate seat has meshing teeth that cooperate with the corresponding synchronous belt.

[0013] According to another aspect of the utility model, a grinding system is provided, including: a grinding component and a lifting device for driving the grinding component to lift and lower, the lifting device is the lifting device mentioned above, and the grinding component is arranged on a mounting seat of the lifting device.

[0014] By applying the technical solution of the utility model, the transmission synchronous belt straddling the transmission synchronous wheel constitutes a first synchronous belt segment and a second synchronous belt segment located on both sides of the transmission synchronous wheel, wherein the free end of the first synchronous belt segment is arranged on a fixed primary bracket, and the mounting seat is arranged on the free end of the second synchronous belt segment. When the lifting device needs to be raised, the driving device drives the first lifting structure to rise, and the first lifting structure drives the secondary bracket thereon to rise. As the secondary bracket rises, the transmission synchronous wheel thereon rises with the secondary bracket. As the transmission synchronous wheel moves upward, the length of the first synchronous belt segment gradually increases, and the length of the second synchronous belt segment gradually decreases, that is, the mounting seat rises relative to the secondary bracket. Therefore, in the above structure, the stroke length of the mounting seat is actually the sum of the height of the secondary bracket rising and the height of the mounting seat relative to the secondary bracket rising, so the lifting device of the utility model makes the lifting height higher and can achieve full coverage during operation. In addition, the secondary lifting device adopts the form of a transmission wheel and a transmission belt, so that the mechanism of the secondary lifting device is small in size and light in weight, thereby reducing the height restriction and facilitating transfer. In summary, by applying the technical solution of the utility model, the requirements of lifting height and passage height can be met at the same time.

[0015] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0017] Figure 1 A three-dimensional structural schematic diagram of an embodiment of a lifting device according to the utility model is shown; and

[0018] Figure 2 Shows Figure 1 A schematic diagram of the three-dimensional structure of the lifting device after removing the accordion cover;

[0019] Figure 3 Shows Figure 2 An enlarged structural diagram of a lifting device at A;

[0020] Figure 4 Shows Figure 2 A schematic top view of a lifting device;

[0021] Figure 5 Shows Figure 4 A schematic cross-sectional view of the lifting device in the BB direction;

[0022] Figure 6Shows Figure 5 An enlarged structural diagram of a lifting device at D;

[0023] Figure 7 Shows Figure 5 An enlarged structural diagram of the lifting device at E;

[0024] Figure 8 Shows Figure 4 A cross-sectional schematic diagram of the lifting device along the CC direction; and

[0025] Fig. 9 Shows Figure 1 Schematic diagram of the three-dimensional structure of the first-level lifting device of the lifting equipment.

[0026] The above drawings include the following reference numerals:

[0027] 1. Platen seat; 2. Platen cover; 10. Primary lifting device; 11. Primary bracket; 111. First mounting surface; 112. Bracket body; 113. Mounting shaft seat; 114. Mounting vertical plate; 115. Connecting vertical plate; 12. First lifting structure; 13. Lifting synchronous wheel; 14. Lifting transmission belt; 15. Lifting guide structure; 151. Second guide rail; 152. Second slider; 16. Driving device; 20. Secondary lifting device; 21. Secondary bracket; 211. Second mounting surface; 22. Transmission assembly; 221. Transmission synchronous belt; 222. Second lifting structure; 223. Transmission synchronous wheel; 224. Mounting seat; 23. Mounting seat guide structure; 231. First guide rail; 232. First slider; 30. Organ cover; 31. Guide plate; 32. Organ expansion piece. DETAILED DESCRIPTION

[0028] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0029] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0030] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged where appropriate, so as to describe the embodiments of the present invention described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0031] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0032] like Figures 1 to 9 As shown, the lifting device of this embodiment includes: a primary lifting device 10 and a secondary lifting device 20, wherein the primary lifting device 10 includes a fixed primary bracket 11, a first lifting structure 12 movably arranged on the primary bracket 11, and a driving device 16 for driving the first lifting structure 12 to move; the secondary lifting device 20 includes a secondary bracket 21 arranged on the first lifting structure 12 and a transmission assembly 22 arranged on the secondary bracket 21, the transmission assembly 22 includes a transmission synchronous belt 221, a second lifting structure 222, a transmission synchronous wheel 223 and a mounting seat 224, the transmission synchronous wheel 223 is pivotally arranged on the top of the secondary bracket 21, the transmission synchronous belt 221 is straddled on the transmission synchronous wheel 223 and meshed with the transmission synchronous wheel 223, one end of the transmission synchronous belt 221 is fixedly connected to the primary bracket 11, the mounting seat 224 is fixedly arranged on the other end of the transmission synchronous belt 221 through the second lifting structure 222, and the transmission synchronous belt 221 is tensioned under the gravity of the mounting seat 224.

[0033] By applying the technical solution of this embodiment, the transmission synchronous belt 221 straddling the transmission synchronous wheel 223 constitutes a first synchronous belt segment and a second synchronous belt segment located on both sides of the transmission synchronous wheel 223, wherein the free end of the first synchronous belt segment is arranged on the fixed primary bracket 11, and the mounting seat 224 is arranged on the free end of the second synchronous belt segment. When the lifting device needs to be raised, the driving device 16 drives the first lifting structure 12 to rise, and the first lifting structure 12 drives the secondary bracket 21 thereon to rise. As the secondary bracket 21 rises, the transmission synchronous wheel 223 thereon rises with the secondary bracket 21. As the transmission synchronous wheel 223 moves upward, the length of the first synchronous belt segment gradually increases, and the length of the second synchronous belt segment gradually decreases, that is, the mounting seat 224 rises relative to the secondary bracket 21. Therefore, in the above structure, the stroke length of the mounting seat 224 is actually the sum of the height of the secondary bracket 21 rising and the height of the mounting seat 224 rising relative to the secondary bracket 21. Therefore, the lifting device of this embodiment makes the lifting height higher, and can achieve full coverage during operation. In addition, the secondary lifting device 20 adopts the form of transmission wheels and transmission belts, so that the secondary lifting device 20 has a small volume and light weight, thereby reducing the height restriction and facilitating transfer. In summary, the technical solution of this embodiment can meet the requirements of lifting height and passage height at the same time.

[0034] It should be noted that the lifting equipment of this embodiment also has the following two advantages: first, the second-level lifting device 20 adopts the form of transmission wheels and transmission belts, so that the adjustment accuracy of the lifting equipment is high; second, as the second-level bracket 21 rises, the mounting seat 224 rises synchronously with the second-level bracket 21, which makes the adjustment speed of the lifting equipment faster and the adjustment efficiency higher.

[0035] It should also be noted that when the lifting device of this embodiment is descending, the movement mode is opposite to that of ascending, which will not be described in detail here.

[0036] like Figure 2 , Figure 5 and Figure 7 As shown, in this embodiment, the secondary lifting device 20 further includes a mounting seat guide structure 23, which includes a first guide rail 231 provided on the secondary bracket 21 and extending up and down, and a first slider 232 movably provided on the first guide rail 231, and the mounting seat 224 is fixedly connected to the first slider 232. The above structure can limit the displacement of the mounting seat 224 in a direction perpendicular to the secondary bracket 21, ensuring that the mounting seat 224 can only perform lifting and lowering movements.

[0037] like Figure 5 , Figure 8 and Fig. 9As shown, in this embodiment, the first-stage lifting device 10 also includes: lifting synchronous wheels 13 pivotally arranged at the upper and lower ends of the first-stage bracket 11, and a lifting transmission belt 14 sleeved on the two lifting synchronous wheels 13, the lifting transmission belt 14 meshes with the lifting synchronous wheels 13, the first lifting structure 12 is fixedly connected to the lifting transmission belt 14, and the driving device 16 is a driving motor connected to one of the lifting synchronous wheels 13. Specifically, when the driving device 16 is working, the driving device 16 drives one of the lifting synchronous wheels 13 to rotate, and the other lifting synchronous wheel 13 forms a driven wheel. The lifting synchronous wheel 13 drives the lifting transmission belt 14 to move, and the first lifting structure 12 is lifted and lowered under the drive of the lifting transmission belt 14. The above structure makes the first-stage lifting device 10 small in size and light in weight, thereby reducing height restrictions and facilitating transfer.

[0038] like Figure 5 , Figure 7 and Fig. 9 As shown, in this embodiment, the primary lifting device 10 further includes: a lifting guide structure 15, the lifting guide structure 15 includes a second guide rail 151 provided on the primary bracket 11 and extending up and down, and a second slider 152 movably provided on the second guide rail 151, and the secondary bracket 21 is fixedly connected to the second slider 152. The above structure can limit the displacement of the secondary bracket 21 in a direction perpendicular to the primary bracket 11, ensuring that the secondary bracket 21 can only perform lifting movement.

[0039] like Figure 3 , Figure 5 and Fig. 9 As shown, in this embodiment, the primary bracket 11 has a first mounting surface 111 for mounting the lifting guide structure 15, and the secondary bracket 21 has a second mounting surface 211 for mounting the mounting seat guide structure 23, and the first mounting surface 111 is parallel to the second mounting surface 211. The above structure enables all guide rails to be mounted on the same side of the device, greatly reducing the difficulty of processing.

[0040] like Figure 2 , Figure 3 and Fig. 9 As shown, in this embodiment, the primary bracket 11 includes a bracket body 112 and a mounting shaft seat 113 for mounting the upper lifting synchronous wheel 13, and one end of the transmission synchronous belt 221 is fixedly connected to the mounting shaft seat 113. The existing mounting shaft seat 113 is used as a fixing position for the transmission synchronous belt 221, which reduces parts and reduces costs.

[0041] Preferably, if Figure 2 , Figure 3 and Fig. 9As shown, in this embodiment, the mounting shaft seat 113 includes two mounting vertical plates 114 for mounting the lifting synchronous wheel 13 and a connecting vertical plate 115 arranged on the upper part of the two mounting vertical plates 114, the connecting vertical plate 115 is parallel to the vertical section of the transmission synchronous belt 221, and the end of the transmission synchronous belt 221 is fixedly arranged on the connecting vertical plate 115. The above structure is simple and easy to process. It should be noted that the end of the transmission synchronous belt 221 is fixedly arranged on the connecting vertical plate 115 through the synchronous belt pressing plate.

[0042] In this embodiment, the lifting synchronous wheel 13 is parallel to the axis of the transmission synchronous wheel 223, and the projection of the perpendicular bisector of the lifting synchronous wheel 13 on the first mounting surface 111 coincides with the projection of the perpendicular bisector of the transmission synchronous wheel 223 on the first mounting surface 111. The above structure makes the width of the lifting device in the axis direction of the lifting synchronous wheel 13 smaller, thereby realizing a miniaturized design.

[0043] like Figure 1 As shown, in this embodiment, the lifting device further includes an accordion cover 30, which includes two guide plates 31 arranged opposite to each other and an accordion expansion piece 32 located between the two guide plates 31, and an escape opening for escaping the mounting seat 224 is provided on the accordion expansion piece 32, and the accordion expansion piece 32 expands and contracts with the movement of the mounting seat 224. The above structure does not affect the movement of the mounting seat 224, and can also play a role in dust prevention.

[0044] like Figure 7 As shown, in this embodiment, the first lifting structure 12 and the second lifting structure 222 are synchronous belt pressure plates, and the synchronous belt pressure plates include a pressure plate seat 1 and a pressure plate cover 2 that are interlocked, and the pressure plate seat 1 has meshing teeth that cooperate with the corresponding synchronous belt. The above structure prevents relative displacement between the first lifting structure 12 and the second lifting structure 222 and the corresponding synchronous belt, thereby ensuring lifting accuracy. Of course, in other embodiments not shown in the figure, only one of the first lifting structure 12 and the second lifting structure 222 can be a synchronous belt pressure plate.

[0045] The present application also provides a grinding system. According to an embodiment of the grinding system of the present application, the grinding system includes: a grinding component and a lifting device for driving the grinding component to lift and lower. The lifting device is the above-mentioned lifting device. The grinding component is arranged on the mounting seat 224 of the lifting device. Since the above-mentioned lifting device has the advantage of being able to meet the requirements of the lifting height and the passing height at the same time, the grinding system having the same also has the above-mentioned advantages.

[0046] From the above description, it can be seen that the above embodiments of the utility model achieve the following technical effects:.

[0047] 1. The structure is simple. The secondary lifting can be realized by only adding the secondary bracket 21, the transmission synchronous belt 221, the second lifting structure 222 and the transmission synchronous wheel 223;

[0048] 2. Small size, strong versatility, suitable for all construction robots or lifting equipment using lifting mechanisms;

[0049] 3. All linear guides are installed on the same side, greatly reducing the difficulty of processing;

[0050] 4. Compared with screw drive, synchronous belt drive has low installation requirements, low cost and light weight; compared with chain drive, synchronous belt drive has low cost, light weight, small size and high transmission accuracy.

[0051] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps described in these embodiments do not limit the scope of the utility model. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0052] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0053] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present utility model; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0054] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A lifting device, characterized in that: include: A first-stage lifting device (10) comprises a first-stage support (11) which is fixedly arranged, a first lifting structure (12) which is arranged on the first-stage support (11) so as to be movable up and down, and a driving device (16) for driving the first lifting structure (12) to move; A secondary lifting device (20) comprises a secondary support (21) arranged on the first lifting structure (12) and a transmission assembly (22) arranged on the secondary support (21); the transmission assembly (22) comprises a transmission synchronous belt (221), a second lifting structure (222), a transmission synchronous wheel (223) and a mounting seat (224); the transmission synchronous wheel (223) is pivotally arranged on the top of the secondary support (21); the transmission synchronous belt (221) is straddled on the transmission synchronous wheel (223) and meshed with the transmission synchronous wheel (223); one end of the transmission synchronous belt (221) is fixedly connected to the primary support (11); the mounting seat (224) is fixedly arranged on the other end of the transmission synchronous belt (221) through the second lifting structure (222); the transmission synchronous belt (221) is tensioned under the action of gravity of the mounting seat (224).

2. The lifting device according to claim 1, characterized in that: The secondary lifting device (20) further comprises a mounting seat guide structure (23), wherein the mounting seat guide structure (23) comprises a first guide rail (231) disposed on the secondary bracket (21) and extending up and down, and a first slider (232) movably disposed on the first guide rail (231), and the mounting seat (224) is fixedly connected to the first slider (232).

3. The lifting device according to claim 1, characterized in that: The first-stage lifting device (10) further comprises: lifting synchronous wheels (13) respectively pivotally arranged at the upper and lower ends of the first-stage bracket (11) and a lifting transmission belt (14) sleeved on the two lifting synchronous wheels (13), the lifting transmission belt (14) meshingly cooperating with the lifting synchronous wheels (13), the first lifting structure (12) being fixedly connected to the lifting transmission belt (14), and the driving device (16) being a driving motor drivingly connected to one of the lifting synchronous wheels (13).

4. The lifting device according to claim 3, characterized in that: The first-stage lifting device (10) further comprises: a lifting guide structure (15), wherein the lifting guide structure (15) comprises a second guide rail (151) disposed on the first-stage bracket (11) and extending up and down, and a second slider (152) movably disposed on the second guide rail (151), and the second-stage bracket (21) is fixedly connected to the second slider (152).

5. The lifting device according to claim 4, characterized in that: The secondary lifting device (20) further comprises a mounting seat guide structure (23), wherein the mounting seat guide structure (23) comprises a first guide rail (231) disposed on the secondary bracket (21) and extending up and down, and a first slider (232) movably disposed on the first guide rail (231), and the mounting seat (224) is fixedly connected to the first slider (232); wherein, The first-level bracket (11) has a first mounting surface (111) for mounting a lifting guide structure (15), and the second-level bracket (21) has a second mounting surface (211) for mounting a mounting seat guide structure (23), and the first mounting surface (111) is parallel to the second mounting surface (211).

6. The lifting device according to claim 5, characterized in that: The primary bracket (11) comprises a bracket body (112) and a mounting shaft seat (113) for mounting the upper lifting synchronous wheel (13); one end of the transmission synchronous belt (221) is fixedly connected to the mounting shaft seat (113).

7. The lifting device according to claim 6, characterized in that: The axes of the lifting synchronous wheel (13) and the transmission synchronous wheel (223) are parallel, and the projection of the perpendicular bisector of the lifting synchronous wheel (13) on the first installation surface (111) coincides with the projection of the perpendicular bisector of the transmission synchronous wheel (223) on the first installation surface (111).

8. The lifting device according to claim 1, characterized in that: The lifting device further comprises an accordion cover (30), wherein the accordion cover (30) comprises two guide plates (31) arranged opposite to each other and an accordion expansion piece (32) located between the two guide plates (31), wherein the accordion expansion piece (32) is provided with an escape opening for avoiding the mounting seat (224), and the accordion expansion piece (32) expands and contracts as the mounting seat (224) moves.

9. The lifting device according to claim 3, characterized in that: The first lifting structure (12) and / or the second lifting structure (222) is a synchronous belt pressure plate, and the synchronous belt pressure plate comprises a pressure plate seat (1) and a pressure plate cover (2) that are interlocked, and the pressure plate seat (1) has meshing teeth that cooperate with the corresponding synchronous belt.

10. A grinding system comprising: A grinding assembly and a lifting device for driving the grinding assembly to lift, characterized in that the lifting device is the lifting device described in any one of claims 1 to 9, and the grinding assembly is arranged on a mounting seat (224) of the lifting device.

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