Magnetic drive conveying line

Abstract

The utility model discloses a magnetic drive conveying line which comprises a magnetic drive line body, a plurality of first stations, a plurality of second stations, a plurality of magnetic drive conveying belts and a plurality of magnetic drive conveying belts. The at least two mover modules are arranged on the magnetic drive wire body, the mover modules are used for bearing materials, and each mover module can be driven by a magnetic field to move among the multiple first stations; the at least one jacking module is used for driving the mover module located at the first station to ascend to the second station or driving the mover module located at the second station to descend to the first station, and the jacking module is used for driving the mover module located at the first station to ascend to the second station. And a gap for other rotor modules to pass through is formed between the lower part of the rotor module positioned at the second station and the magnetic drive wire body. According to the magnetic drive conveying line, the continuity of the production process is good.

Description

TECHNICAL FIELD

[0001] The utility model relates to conveying equipment technical field especially relates to a magnetic drive conveying line. BACKGROUND

[0002] The magnetic drive conveying line is a multi-mover intelligent conveying system based on the principle of linear motor, which mainly comprises a stator module and a mover module. Each mover module does not need external cable and can be independently controlled, and can adapt to the beat of different production stations to improve the flexibility of the production line.

[0003] The traditional processing mode presents the characteristics of linear sequence, that is, each station carries out processing work one by one according to the sequence, and the production beat is in a fixed and unchangeable state. This linear sequence processing mode with fixed beat restricts the improvement of production efficiency to a great extent. Specifically, since each station must operate according to the established sequence and fixed beat, it cannot be flexibly adjusted, and once a problem occurs or needs to be adjusted, it will affect the continuity of the whole production process, resulting in production delay. SUMMARY

[0004] The utility model aims at at least solving one of the technical problems existing in the prior art. For this purpose, the utility model provides a magnetic drive conveying line, which has good continuity of production process.

[0005] The magnetic drive conveying line according to the embodiment of the utility model comprises:

[0006] A magnetic drive line body has a plurality of first stations, and each first station has a second station above it;

[0007] At least two mover modules are arranged on the magnetic drive line body, and the mover modules are used to carry materials, and each mover module can move between a plurality of first stations under the drive of a magnetic field;

[0008] At least one jacking module is used to drive the mover modules in the first station to rise to the second station or drive the mover modules in the second station to fall to the first station, wherein the lower part of the mover modules in the second station and the magnetic drive line body have an interval for other mover modules to pass through.

[0009] The magnetic drive conveying line according to the embodiment of the utility model has at least the following beneficial effects:

[0010] The jacking module is arranged, the jacking module drives the mover module in the first station to ascend to the second station, so that the material on the mover module in the second station is conveniently processed.

[0011] According to some embodiments of the present application, the number of jacking modules is the same as the number of first stations, and each first station is provided with a jacking module.

[0012] The magnetic driving conveying line comprises a driving assembly, the driving assembly drives the jacking module to move along the magnetic driving line body, and the driving assembly and the jacking module cooperate to enable the mover modules of multiple first stations to ascend to corresponding second stations or enable the mover modules in the second stations to translate to another second station.

[0013] According to some embodiments of the present application, the two sides of the mover module in the width direction have support surfaces.

[0014] The jacking module comprises a first driving member, a first support frame and a second support frame, the first support frame and the second support frame are arranged on the two sides in the width direction of the magnetic driving line body, and the first support frame and the second support frame each have a first protruding strip protruding towards one side of the magnetic driving line body, the first driving member drives the first support frame and the second support frame to ascend and descend, so that the first protruding strip supports the support surface and jacks up the mover module.

[0015] According to some embodiments of the present application, the two sides of the mover module in the width direction have grooves, the jacking module comprises a first driving member, a first support frame and a second support frame, the first support frame and the second support frame each have a first protruding strip protruding towards one side of the magnetic driving line body, and the first protruding strip can be inserted into the groove when the mover module enters the first station.

[0016] According to some embodiments of the present application, the first support frame and the second support frame each have a second protruding strip protruding towards one side of the magnetic driving line body, and the second protruding strip is located below the first protruding strip.

[0017] When the first protruding strip is in the groove of a mover module and is lifted to a second station, the second protruding strip can extend into the groove of the mover module passing through the first station.

[0018] According to some embodiments of the utility model, the rotor module comprises a support main body and a plurality of rollers, the plurality of rollers are distributed at both ends of the width direction of the support main body, wherein the roller at at least one end of the width direction of the support main body has an annular protrusion or an annular groove around the outer periphery;

[0019] The magnetic drive line body comprises a plurality of guide rails matched with the rollers, wherein at least one of the guide rails has a strip-shaped groove or a strip-shaped protrusion, and the annular protrusion is matched with the strip-shaped groove or the annular groove is matched with the strip-shaped protrusion to guide the movement of the rotor module.

[0020] According to some embodiments of the utility model, the rotor module comprises a support main body and a plurality of rollers, the plurality of rollers are distributed at both ends of the width direction of the support main body, wherein the rotor module further comprises a permanent magnet, and the permanent magnet is arranged at the middle of the width direction of the support main body;

[0021] The magnetic drive line body comprises a plurality of winding coils, the plurality of winding coils are connected or disconnected in a preset order to generate a moving magnetic field, and the permanent magnet is located in the magnetic field of the plurality of winding coils.

[0022] According to some embodiments of the utility model, the rotor module comprises a magnetic scale, and the magnetic scale is arranged on one side of the width direction of the support main body;

[0023] The magnetic drive line body comprises a feedback scale matched with the magnetic scale, and along the width direction of the magnetic drive line body, the movement path of the magnetic scale is located on the outside of the feedback scale.

[0024] According to some embodiments of the utility model, the rotor module comprises a support main body, mounting blocks are arranged on both sides of the width direction of the surface of the magnetic drive line body respectively, the mounting blocks comprise a first sub-block and a second sub-block connected, and the first sub-block is connected with the support main body;

[0025] The first sub-block is detachably connected with the support main body, the second sub-block is connected on the side of the first sub-block away from the support main body, and along the width direction, the second sub-block exceeds the first sub-block outward, and the exceeding part of the second sub-block and the support main body and the first sub-block jointly enclose a groove.

[0026] According to some embodiments of the utility model, the rotor module comprises a plurality of rollers and a magnetic scale, the rollers are installed on the side of the first sub-block away from the support main body, and the magnetic scale is installed on the side of the second sub-block away from the support main body;

[0027] Along the height direction, the projection of the second sub-block is located in the projection of the support main body.

[0028] The additional aspects and advantages of the present application will be given partly in the following description, some will become obvious from the following description, or will be understood by the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0029] The present application will be further described below in conjunction with the drawings and embodiments, wherein:

[0030] Figure 1 Structure diagram of the magnetic drive conveying line of the embodiment of the present application;

[0031] Figure 2 Another structure diagram of the magnetic drive conveying line of the embodiment of the present application;

[0032] Figure 3 Front view of the magnetic drive conveying line of the embodiment of the present application;

[0033] Figure 4 Structure diagram of the mover module of the magnetic drive conveying line of the embodiment of the present application.

[0034] Reference signs:

[0035] 100, magnetic drive line body; 110, guide rail; 120, winding coil; 130, feedback ruler;

[0036] 200, mover module; 200a, support surface; 200b, groove; 210, support main body; 220, roller; 230, permanent magnet; 240, magnetic scale ruler; 241, first sub-block; 252, second sub-block;

[0037] 300, jacking module; 310, first support frame; 320, second support frame; 330, first convex strip; 340, second convex strip; 311, support plate; 312, connecting plate. DETAILED DESCRIPTION

[0038] The embodiments of the present application will be described in detail below, and the examples of the embodiments are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary, only for explaining the present application, and cannot be understood as limiting the present application.

[0039] In the description of the present application, it should be understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or position relationship shown in the drawings, only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0040] In the description of the utility model, the meaning of several is one or more, the meaning of multiple is two or more, greater than, less than, more than, etc. are understood as not including the number, above, below, within, etc. are understood as including the number. If it is described to the first, second, it is only used for distinguishing the purpose of technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0041] In the description of the utility model, unless otherwise explicitly limited, the words such as setting, installation, connection, etc. should be understood in a broad sense, and the person skilled in the art can reasonably determine the specific meaning of the above words in the utility model combined with the specific content of the technical scheme.

[0042] In the description of the utility model, the description of reference terms "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are included in at least one embodiment or example of the utility model. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0043] Please refer to Figures 1-4 The utility model embodiment provides a kind of magnetic drive conveying line, including magnetic drive line body 100, at least two dynamic module 200 and several jacking module 300.

[0044] Please refer to Figure 1 And Figure 2 Magnetic drive line body 100 has several first stations, and each first station has a second station above. Wherein, the shape of magnetic drive line body 100 is not limited, for example, it can be linear arrangement, and the second station is located above the first station, which can be used as a station for machining or assembling parts.

[0045] At least two dynamic modules 200 are arranged on the magnetic drive line body 100, and the dynamic module 200 is used to carry materials, and each dynamic module 200 can move between the first stations under the drive of the magnetic field. That is, the dynamic module 200 can move relative to the magnetic drive line body 100, and then move to different first stations.

[0046] Several jacking modules 300 are arranged in each first station, and the jacking module 300 is used to drive the dynamic module 200 in the first station to rise to the second station, or drive the dynamic module 200 in the second station to fall to the first station, wherein the lower side of the dynamic module 200 in the second station and the magnetic drive line body 100 have a space for other dynamic modules 200 to pass through.

[0047] By setting the jacking module 300, the jacking module 300 drives the mover module 200 in the first station to rise to the second station, so as to facilitate the processing of the material on the mover module 200 in the second station. The lower part of the mover module 200 in the second station and the magnetic drive line body 100 have a gap for other mover modules 200 to pass through, so as to facilitate the movement of other mover modules 200 between the magnetic drive line body 100 in multiple first stations, thereby ensuring the continuity of the entire production process.

[0048] In some embodiments, referring to Figure 1 and Figure 2 , the number of jacking modules 300 is the same as the first stations, and each first station is correspondingly provided with a jacking module 300. When the mover module 200 carrying the material moves to the first station, the corresponding jacking module 300 works to lift the mover module 200 carrying the material to the second station, so as to facilitate subsequent processing.

[0049] In other embodiments, the magnetic drive conveying line includes a driving assembly, the driving assembly drives the jacking module 300 to move along the magnetic drive line body 100, and the driving assembly and the jacking module 300 cooperate to enable the mover modules 200 in multiple first stations to rise to the corresponding second stations, or enable the mover modules 200 in the second station to translate to another second station, that is, the mover modules 200 in the second station move to another second station without passing through the first station.

[0050] Through the movement of the driving assembly, the number of jacking modules 300 can be reduced. Specifically, by driving the jacking module 300 to move along the magnetic drive line body 100 through the driving assembly, one jacking module 300 can be selectively adapted in one of multiple first stations, so that it is not necessary to correspondingly provide a jacking module 300 for each first station.

[0051] In addition, through the cooperation of the driving assembly and the jacking module 300, the mover modules 200 in the second station move to another second station without passing through the first station, so as to avoid interference with the mover modules 200 in the first station and facilitate the adjustment of the positions of the mover modules 200 in each second station.

[0052] The number of jacking modules 300 can be one or more.

[0053] If the number of jacking modules 300 is one, the driving assembly drives the jacking module 300 to adapt to any one of all the first stations, and the cost of this scheme is relatively low.

[0054] If the number of the lifting modules 300 is multiple, the driving assembly drives each lifting module 300 to adapt to any one of all the first stations, so that when one of the lifting modules 300 lifts the mover module 200 in the first station to the corresponding second station, the other lifting modules 300 can still adapt to the other first stations, thereby improving the work efficiency.

[0055] In other embodiments, if the number of the lifting modules 300 is multiple, each lifting module 300 respectively adapts to a part of all the first stations, that is, the first stations are divided into multiple groups, each group contains at least one first station, and each lifting module 300 corresponds to one of the groups.

[0056] In order to support and lift the mover module 200, some embodiments refer to Figure 4 , the mover module 200 has a support surface 200a on both sides in the width direction.

[0057] Please refer to Figure 1 , Figure 3 and Figure 4 , the lifting module 300 includes a first driving member, a first support frame 310 and a second support frame 320, the first support frame 310 and the second support frame 320 are distributed on both sides in the width direction of the magnetic driving wire body 100, and the first support frame 310 and the second support frame 320 both have a first protruding strip 330 protruding towards one side of the magnetic driving wire body 100. Among them, the first support frame 310 and the second support frame 320 can be a plate structure, the first protruding strip 330 is arranged in the moving direction, specifically, the first protruding strip 330 is a horizontal strip structure, or it can be a plurality of protruding structures arranged horizontally and spaced from each other.

[0058] The first driving member drives the first support frame 310 and the second support frame 320 to lift, so that the first protruding strip 330 supports on the support surface 200a and lifts the mover module 200. It can be understood that when the first protruding strip 330 supports on the support surface 200a, the projection of the first protruding strip 330 and the projection of the support surface 200a of the mover module 200 partially coincide in the height direction.

[0059] It can be understood that by arranging the support surface 200a on both sides in the width direction of the mover module 200, the first support frame 310 and the second support frame 320 are respectively supported on the support surface 200a on both sides, thereby supporting the mover module 200. On the one hand, it can be convenient to lift the mover module 200, and on the other hand, it can still stably support the mover module 200 when the mover module 200 is in the second station, so that the mover module 200 can provide a stable processing environment.

[0060] Please refer to Figure 3 and Figure 4In some embodiments, the mover module 200 has grooves 200b on both sides in the width direction, the support surface 200a can be part of the inner wall surface of the grooves 200b, and the first support frame 310 and the second support frame 320 are supported on the inner wall of the grooves 200b. The first protruding strip 330 can be inserted into the groove 200b when the mover module 200 enters the first station. In this way, the first protruding strip 330 and the groove 200b can cooperate to limit the displacement of the mover module 200, thereby avoiding the mover module 200 from easily disengaging from the first support frame 310 and the second support frame 320 due to external force when moving to the second station.

[0061] The groove 200b is a groove structure extending in the moving direction, and the size in the up-down direction is greater than the first protruding strip 330 to facilitate the entry of the first protruding strip 330.

[0062] In some embodiments, the first support frame 310 and the second support frame 320 each have a second protruding strip 340 protruding towards the side of the magnetic drive wire body 100, and the second protruding strip 340 is located below the first protruding strip 330.

[0063] When the first protruding strip 330 is in the groove 200b of a mover module 200 and is lifted to the second station, the second protruding strip 340 can extend into the groove 200b of the mover module 200 passing through the first station. The second protruding strip 340 is arranged to extend in the moving direction, specifically, the second protruding strip 340 is a horizontally extending strip structure, or can be a plurality of protruding structures arranged horizontally and spaced from each other.

[0064] It can be understood that when the second station has a mover module 200 and the mover module 200 needs to be switched to the first station, if there is a mover module 200 in the first station below the second station, the second protruding strip 340 will interfere with the mover module 200 when the lifting module 300 is lowered, thereby achieving mechanical hard limiting, avoiding the mover module 200 in the second station from moving downward and colliding with and damaging the mover module 200 in the first station and the material.

[0065] In some embodiments, the first support frame 310 and the second support frame 320 are structurally identical, the first support frame 310 includes a support plate 311 and a connecting plate 312, and the connecting plate 312 is arranged on the side of the support plate 311 facing the magnetic drive wire body 100. The upper end of the connecting plate 312 is bent towards the side away from the support plate 311 to form the first protruding strip 330, and the lower end of the connecting plate 312 is bent towards the side away from the support plate 311 to form the second protruding strip 340. The connecting plate 312 can be fixed to the support plate 311 by a detachable fastening method to facilitate disassembly and replacement.

[0066] Please refer to Figure 2 , Figure 3 and Figure 4In some embodiments, the mover module 200 includes a support body 210 for supporting the material and a plurality of rollers 220 distributed at both ends of the support body 210 in the width direction. The magnetic drive wire body 100 includes a plurality of guide rails 110 matched with the rollers 220. The rollers 220 and the guide rails 110 are matched to roll and support the support body 210.

[0067] In some embodiments, the roller 220 at at least one end of the support body 210 in the width direction has a ring-shaped protrusion or a ring-shaped groove around the outer circumferential surface. The at least one guide rail 110 has a strip-shaped groove 200b or a strip-shaped protrusion, and the ring-shaped protrusion is matched with the strip-shaped groove or the ring-shaped groove is matched with the strip-shaped protrusion to guide the movement of the mover module 200.

[0068] It can be understood that the rollers 220 at both ends of the support body 210 in the width direction have a ring-shaped protrusion or a ring-shaped groove around the outer circumferential surface. Specifically, the rollers 220 at both ends of the support body 210 in the width direction have a ring-shaped protrusion. Or the rollers 220 at both ends of the support body 210 in the width direction have a ring-shaped groove. Or one end of the support body 210 has a ring-shaped protrusion and the other end has a ring-shaped groove. In some embodiments, the roller 220 at one end of the support body 210 in the width direction has a ring-shaped protrusion or a ring-shaped groove around the outer circumferential surface, and the outer circumferential surface of the roller 220 at the other end is substantially flat. In this way, the cost can be reduced and the friction during movement can be reduced.

[0069] In some embodiments, the roller 220 is arranged on the surface of the support body 210 facing the magnetic drive wire body 100. The ring-shaped protrusion around the outer circumferential surface can be a V-shaped roller 220.

[0070] In some embodiments, the mover module 200 includes a support body 210 for supporting the material and a plurality of rollers 220 distributed at both ends of the support body 210 in the width direction. The magnetic drive wire body 100 includes a plurality of winding coils 120, and the plurality of winding coils 120 are turned on and off in a predetermined sequence to generate a moving magnetic field. The permanent magnet 230 is located in the magnetic field of the plurality of winding coils 120. In this way, the magnetic drive function is realized by the cooperation of the permanent magnet 230 and the magnetic field, and the frictional resistance can be reduced. In addition, the mover module 200 does not need to be externally connected to a wire, thereby avoiding the problems of wiring and wear of the wire.

[0071] In some embodiments, the mover module 200 comprises a magnetic scale 240 arranged on one side of the support body 210 in the width direction. The magnetic drive wire body 100 comprises a feedback scale 130 matched with the magnetic scale 240, and the moving path of the magnetic scale 240 is located outside the feedback scale 130 in the width direction of the magnetic drive wire body 100. The linear displacement of the mover module 200 is measured by matching the magnetic scale 240 and the feedback scale 130, so that the mover module 200 can be moved to a preset position.

[0072] In some embodiments, the mover module 200 comprises a support body 210, and the support body 210 is arranged with mounting blocks on both sides of the surface of the support body 210 in the width direction, and the mounting blocks comprise a first sub-block 241 and a second sub-block 252 connected.

[0073] The first sub-block 241 is detachably connected to the support body 210, the second sub-block 252 is connected to the side of the first sub-block 241 away from the support body 210, and in the width direction, the second sub-block 252 extends outward beyond the first sub-block 241, and the second sub-block 252 beyond the first sub-block 241 and the support body 210 together enclose a groove 200b. In this way, the mounting block can be easily replaced.

[0074] In order to facilitate installation, a strip-shaped groove can be formed on the surface of the support body 210 facing the magnetic drive wire body 100 to quickly position the first sub-block 241.

[0075] Further, in some embodiments, the roller 220 is mounted on the side of the first sub-block 241 away from the support body 210, and the magnetic scale 240 is mounted on the side of the second sub-block 252 away from the support body 210. In the height direction, the projection of the second sub-block 252 is located within the projection of the support body 210. In this way, the overall structure is more compact, reducing the possibility of interference with surrounding components.

[0076] The embodiments of the utility model are described in detail above in combination with the drawings, but the utility model is not limited to the above-mentioned embodiments, and within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the purpose of the utility model. In addition, the embodiments of the utility model and the features in the embodiments can be combined with each other without conflict.

Claims

1. A magnetic drive conveyor line, characterized in that, The application relates to a magnetic driving conveying line. The magnetic driving line body has a plurality of first stations, and each first station has a second station above it. At least two mover modules are arranged on the magnetic driving line body, and the mover modules are used for carrying materials and can move between the first stations under the drive of a magnetic field. At least one jacking module is used for driving the mover modules in the first stations to rise to the second stations or driving the mover modules in the second stations to fall to the first stations.

2. The magnetic drive conveyor line of claim 1, wherein, The number of the jacking modules is the same as that of the first stations, and each first station is provided with a jacking module. The magnetic driving conveying line comprises a driving assembly which drives the jacking modules to move along the magnetic driving line body.

3. The magnetic drive conveyor line of claim 1, wherein, The driving assembly and the jacking modules cooperate to enable the mover modules in a plurality of first stations to rise to corresponding second stations or enable the mover modules in the second stations to translate to another second station. The two sides of the mover module in the width direction have support surfaces.

4. The magnetic drive conveyor line of claim 1, wherein, The jacking module comprises a first driving member, a first support frame and a second support frame. The first support frame and the second support frame are distributed on the two sides in the width direction of the magnetic driving line body.

5. The magnetic drive conveyor line of claim 4, wherein, The first support frame and the second support frame each have a first protruding strip which protrudes towards one side of the magnetic driving line body. The first driving member drives the first support frame and the second support frame to rise and fall so that the first protruding strip supports the support surface and jacks up the mover module.

6. The magnetic drive conveyor line of claim 1, wherein, The two sides of the mover module in the width direction have grooves. The first support frame and the second support frame each have a first protruding strip which protrudes towards one side of the magnetic driving line body. The first protruding strip can be inserted into the groove when the mover module enters the first station. The first support frame and the second support frame each have a second protruding strip which protrudes towards one side of the magnetic driving line body. The second protruding strip can extend into the groove of the mover module which passes through the first station when the first protruding strip is in the groove of one mover module and is lifted to the second station. The mover module comprises a support body and a plurality of rollers. At least one roller at one end of the support body in the width direction has a ring-shaped protrusion or a ring-shaped groove around the outer circumferential surface. The magnetic driving line body comprises a plurality of guide rails which cooperate with the rollers. At least one guide rail has a strip-shaped groove or a strip-shaped protrusion. The ring-shaped protrusion cooperates with the strip-shaped groove or the ring-shaped groove cooperates with the strip-shaped protrusion to guide the movement of the mover module.

7. The magnetic drive conveyor line of claim 1, wherein, The mover module comprises a support body and a plurality of rollers, the plurality of rollers are distributed at both ends of the support body in the width direction, the mover module further comprises a permanent magnet, the permanent magnet is arranged at the middle of the support body in the width direction; The magnetic drive wire body comprises a plurality of winding coils, the plurality of winding coils are connected and disconnected in a preset order to generate a moving magnetic field, and the permanent magnet is located in the magnetic field of the plurality of winding coils.

8. A magnetic drive conveyor line according to claim 6 or 7, c h a r a c t e r i z e d in that The mover module comprises a magnetic grating ruler, and the magnetic grating ruler is arranged on one side of the support body in the width direction. The magnetic drive wire body comprises a feedback ruler matched with the magnetic grating ruler, and the movement path of the magnetic grating ruler is located outside the feedback ruler in the width direction of the magnetic drive wire body.

9. The magnetic drive conveyor line of claim 4, wherein, The mover module comprises a support body, and the support body is respectively provided with mounting blocks on both sides of the surface of the magnetic drive wire body in the width direction, the mounting blocks comprise connected first sub-blocks and second sub-blocks; The first sub-blocks are detachably connected to the support body, the second sub-blocks are connected to the side of the first sub-blocks away from the support body, and in the width direction, the second sub-blocks outwardly exceed the first sub-blocks, and the exceeding part of the second sub-blocks cooperates with the support body and the first sub-blocks to enclose a groove.

10. The magnetic drive conveyor line of claim 9, wherein, The mover module comprises a plurality of rollers and a magnetic grating ruler, the rollers are mounted on the side of the first sub-blocks away from the support body, and the magnetic grating ruler is mounted on the side of the second sub-blocks away from the support body; In the height direction, the projection of the second sub-blocks is located in the projection of the support body.

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