Floating grating device for cantilever beam

Abstract

The invention discloses a floating type grating device for a cantilever beam, the cantilever beam comprises a fixed part and a movable part moving relative to the fixed part, the floating type grating device comprises a grating ruler, a reading head positioning frame, a reading head and an abutting assembly, and the grating ruler is fixedly installed on the movable part of the cantilever beam; the reading head positioning frame is attached to the grating ruler and can move relative to the length direction of the grating ruler when the movable part moves; the reading head is fixedly connected with the reading head positioning frame; the abutting assembly comprises an elastic supporting piece, the elastic supporting piece is used for being fixed to the fixing part, and the elastic supporting piece is used for applying pressure to the reading head so that the reading head positioning frame can be attached to the grating ruler. According to the floating grating device for the cantilever beam, the problems that the reading head fails to read and the read grating data is inaccurate are solved.

Description

Technical Field

[0001] The invention relates to the technical field of measuring tools and apparatuses, and in particular to a floating grating device for a cantilever beam. Background Art

[0002] At present, the grating scale and the reading head of the grating device are both independently installed and fixed at different positions of the cantilever beam. When the grating scale and the reading head are installed on the cantilever beam, there is a preset installation gap between the grating scale and the reading head to ensure that the reading head can accurately read the grating data. When the front end of the cantilever beam is subjected to pressure, the front end of the cantilever beam will sink due to insufficient rigidity, resulting in a large difference between the actual installation gap and the preset installation gap between the grating scale and the reading head, which makes the reading of the reading head easily invalid and unable to accurately read the grating data. Summary of the invention

[0003] The main purpose of the present invention is to provide a floating grating device for a cantilever beam, so as to at least solve the problem that the actual installation gap between the grating scale and the reading head of the grating device applied to the cantilever beam is greatly different from the preset installation gap due to the influence of the cantilever beam structure, which further leads to the reading failure of the reading head and inaccurate grating data.

[0004] According to one aspect of the present invention, there is provided a floating grating device for a cantilever beam, wherein the cantilever beam comprises a fixed portion and a movable portion that moves relative to the fixed portion, and the floating grating device comprises:

[0005] A grating ruler, the grating ruler is fixedly mounted on the movable part of the cantilever beam;

[0006] A reading head positioning frame, wherein the reading head positioning frame is attached to the grating ruler and can move relative to the length direction of the grating ruler when the movable part moves;

[0007] A reading head, the reading head is fixedly connected to the reading head positioning frame;

[0008] The push-up assembly includes an elastic support member, the elastic support member is used to be fixed on the fixed part, and the elastic support member is used to apply pressure to the reading head so that the reading head positioning frame and the grating scale remain in contact.

[0009] Furthermore, the reading head positioning frame includes a reading head bracket and a rolling assembly, the reading head bracket is fixedly connected to the reading head, and the rolling assembly is rotatably connected to the reading head bracket and fits against the grating ruler.

[0010] Furthermore, the reading head bracket is provided with a first mounting hole and a second mounting hole, the rolling assembly can be rotatably connected to the first mounting hole, and the reading head is fixed to the reading head bracket through a connecting piece passing through the second mounting hole.

[0011] Furthermore, the first mounting hole includes a waist-shaped hole, the length direction of the waist-shaped hole is consistent with the thickness direction of the grating scale, the rolling assembly includes a plurality of rolling bearings and bearing fixings corresponding to the plurality of rolling bearings one by one, the plurality of rolling bearings are connected to the reading head bracket through the bearing fixings passed through the waist-shaped hole, and the bearing fixings can be fixed at least at different positions in the length direction of the waist-shaped hole.

[0012] Furthermore, the reading head bracket includes two parallel fixed arms and at least two supporting arms, the two ends of the supporting arms are respectively connected to the two fixed arms, the waist-shaped holes are arranged at the two ends of the fixed arms, and the second mounting hole is arranged in the fixed arm and located between the two waist-shaped holes.

[0013] Furthermore, the support arm and the fixed arm are integrally formed.

[0014] Further, the bearing fixing member includes a first connecting screw, a first connecting bolt or a first connecting stud; and / or,

[0015] The reading head is fixedly mounted on the second mounting hole by a second connecting screw, a second connecting bolt or a second connecting stud.

[0016] Furthermore, the floating grating device for the cantilever beam also includes a connecting portion, the connecting portion is provided with a mounting groove, the reading head is at least partially mounted in the mounting groove, the first end of the elastic support member is connected to the connecting portion, and the second end of the elastic support member opposite to the first end is connected to the fixed portion.

[0017] Furthermore, a protrusion is provided on the second end of the elastic support member, and the elastic support member is fixedly connected to the fixing portion of the cantilever beam via the protrusion.

[0018] Furthermore, the elastic support member includes a strip-shaped spring sheet, and the strip-shaped spring sheet is always in an elastically deformed state to apply pressure to the reading head.

[0019] In the present invention, by providing a push-up assembly, the elastic support member included in the push-up assembly can be fixed on the fixed part of the cantilever beam, and exert pressure on the reading head, so that the reading head positioning frame and the grating ruler always maintain a fitting state. Even if the cantilever beam undergoes structural deformation due to external force (such as sinking of the front end, etc.), the pressure generated by the elastic support member can automatically compensate for this change, ensuring that the relative position relationship between the reading head and the grating ruler is maintained in a suitable state, effectively avoiding the reading failure problem of the reading head caused by the change of the installation gap, ensuring that the reading head can continuously and accurately read the data on the grating ruler, and greatly improving the reading accuracy and reliability when using the grating device under the cantilever beam structure that is easily affected by external forces. The grating device of the present application can achieve the effect of floating support and can adapt to the structural changes of the cantilever beam. Regardless of whether the cantilever beam is subjected to minor vibrations or slight external force disturbances during normal use, or is subjected to more obvious deformation such as the front end being subjected to greater pressure and sinking, the elastic support can flexibly adjust the pressure on the reading head according to the actual situation, so that the fit between the reading head positioning frame and the grating scale is not affected, thereby enabling the grating device to better adapt to the working state of the cantilever beam under different working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings described herein are used to provide a further understanding of the present invention and constitute a part 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 of the present invention. In the drawings:

[0021] Figure 1 A three-dimensional structural diagram of a floating grating device for a cantilever beam disclosed in an embodiment of the present invention from a first viewing angle;

[0022] Figure 2 A three-dimensional structural diagram of a floating grating device for a cantilever beam disclosed in an embodiment of the present invention from a second viewing angle;

[0023] Figure 3 A schematic diagram of the structure of a reading head bracket disclosed in an embodiment of the present invention;

[0024] Figure 4 It is a structural schematic diagram of the connection between the abutting assembly and the connecting part disclosed in an embodiment of the present invention;

[0025] Figure 5 It is a schematic diagram of assembling a floating grating device for a cantilever beam disclosed in an embodiment of the present invention.

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

[0027] 10. Grating ruler; 20. Reading head positioning frame; 21. Reading head bracket; 211. First mounting hole; 212. Second mounting hole; 213. Connecting piece; 214. Fixed arm; 215. Support arm; 22. Rolling assembly; 221. Rolling bearing; 222. Bearing fixing piece; 30. Reading head; 40. Abutting assembly; 41. Elastic supporting piece; 411. Protrusion; 4111. Connecting hole; 412. Strip spring piece; 50. Cantilever beam; 51. Fixed part; 511. Reading head mounting seat; 52. Moving part; 521. Cantilever beam assembly; 522. Wire gauge pair; 60. Connecting part; 61. Mounting groove. DETAILED DESCRIPTION

[0028] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments 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] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. 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 "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0030] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the present invention. 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 being 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 an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0031] As mentioned in the background technology, the grating scale and the reading head of the grating device for the cantilever beam in the prior art are fixedly installed on the fixed part and the moving part of the cantilever beam respectively, and no floating support device is arranged between the grating scale and the reading head. When the moving part of the cantilever beam moves away from the fixed part relative to the fixed part, without the support of the guide rail, the cantilever beam structure of the moving part will sink due to the large pressure of the equipment it carries or its own structural strength, resulting in the change of the gap between the grating scale on the moving part and the reading head on the fixed part. Since the gap between the grating scale and the reading head of the fixed model grating assembly should meet the preset installation gap, the value measured by the reading head will be more accurate. Therefore, the sinking of the cantilever beam of the moving part will cause the reading of the reading head of the grating device to be inaccurate. The grating assembly for the cantilever beam of the present invention will be introduced and explained in detail in conjunction with the accompanying drawings.

[0032] See also Figures 1 to 5 As shown, according to an embodiment of the present application, a floating grating device for a cantilever beam is provided, wherein the cantilever beam 50 includes a fixed portion 51 and a movable portion 52 that moves relative to the fixed portion 51, and the floating grating device includes a grating scale 10, a reading head positioning frame 20, a reading head 30 and a support assembly 40.

[0033] Among them, the grating scale 10 is fixedly installed on the movable part 52 of the cantilever beam 50; the reading head positioning frame 20 is in contact with the grating scale 10 and can move relative to the length direction of the grating scale 10 when the movable part 52 moves; the reading head 30 is fixedly connected to the reading head positioning frame 20; the supporting assembly 40 includes an elastic support member 41, which is used to be fixed on the fixed part 51, and the elastic support member 41 is used to apply pressure to the reading head 30 to keep the reading head positioning frame 20 and the grating scale 10 in contact.

[0034] It can be understood that the grating ruler 10 in this embodiment can realize the positioning function by reading the grating of the grating ruler 10 through the reading head 30 when following the movement of the movable part of the cantilever beam 50. A group of equally spaced transparent and opaque stripes is arranged on the surface of the grating ruler 10. When the grating ruler 10 moves relative to the reading head 30, optical interference will occur to form moiré fringes. The moving direction of the movable part 52 is determined by detecting the moving direction of the moiré fringes through the sensor arranged on the reading head 30. The reading head 30 converts the received moiré fringes light intensity change into an electrical signal. As the movable part 52 moves, the moiré fringes will produce periodic light intensity changes, and the electrical signal output by the reading head 30 is also periodic. By counting and processing this electrical signal, the distance moved by the moiré fringes is determined, and then the displacement of the movable part 52 is calculated based on the relationship between the moiré fringes and the grating displacement.

[0035] Specifically, in this embodiment, when the reading head positioning frame 20 moves relative to the length direction of the grating scale 10, the reading head 30 will also move with the reading head positioning frame 20, that is, when the movable portion 52 drives the grating scale 10 to move, the reading head 30 moves in the opposite direction of the moving direction of the grating scale 10 or remains stationary to read the grating data of the grating scale 10. The elastic support member 41 of the abutting assembly 40 applies pressure to the reading head 30 to keep the reading head positioning frame 20 and the grating scale 10 in contact. When the movable portion 52 drives the grating scale 10 to move, the gap between the grating scale 10 and the reading head 30 will not change, thereby ensuring that the reading head 30 can accurately read the grating data of the grating scale 10.

[0036] Furthermore, the reading head positioning frame 20 includes a reading head bracket 21 and a rolling assembly 22. The reading head bracket 21 is fixedly connected to the reading head 30, and the rolling assembly 22 is rotatably connected to the reading head bracket 21 and fits against the grating scale 10. When the reading head positioning frame 20 is fit against the grating scale 10, the rolling assembly 22 is rotatably connected to the reading head bracket 21 and fits against the grating scale 10, so that the reading head positioning frame 20 can be better moved along the length direction of the grating scale 10.

[0037] By setting the rolling component 22 rotatably connected to the reading head bracket 21 and attached to the surface of the grating scale 10, the reading head bracket 21 is fixedly connected to the reading head 30. When the reading head positioning frame 20 moves as a whole along the length direction of the grating scale 10, the rolling component 22 can contact the surface of the grating scale 10 in a rolling manner. Compared with sliding friction, the resistance of rolling friction is smaller, so that the movement of the reading head positioning frame 20 on the grating scale 10 is smoother, avoiding jamming and blocking, and can improve the continuity and stability of the grating device measurement, thereby ensuring the measurement accuracy.

[0038] Furthermore, the reading head bracket 21 is provided with a first mounting hole 211 and a second mounting hole 212, the rolling assembly 22 is rotatably connected to the first mounting hole 211, and the reading head 30 is fixed to the reading head bracket 21 through a connecting piece 213 penetrating through the second mounting hole 212. The first mounting hole 211 and the second mounting hole 212 make it difficult for the reading head positioning frame 20 to be loosened or displaced during the process of being closely attached to the grating ruler 10 and moving relative to the grating ruler 10, thereby ensuring the stability of the overall structure of the reading head positioning frame 20. It is also convenient for the installation, maintenance and replacement of the components of the reading head positioning frame 20.

[0039] Furthermore, the first mounting hole 211 includes a waist-shaped hole, the length direction of the waist-shaped hole is consistent with the thickness direction of the grating scale 10, the rolling assembly 22 includes a plurality of rolling bearings 221 and bearing fixings 222 corresponding to the plurality of rolling bearings 221 one by one, the plurality of rolling bearings 221 are connected to the reading head bracket 21 through the bearing fixings 222 passed through the waist-shaped hole, and the bearing fixings 222 can be fixed at least at different positions in the length direction of the waist-shaped hole.

[0040] In this embodiment, by setting the first mounting hole 211 as a waist-shaped hole, since the length direction of the waist-shaped hole is consistent with the thickness direction of the grating ruler 10, and the bearing fixing member 222 can be fixed at least at different positions in the length direction of the waist-shaped hole, it is possible to adjust the position of the rolling bearing 221 in the waist-shaped hole through the bearing fixing member 222, and change the installation gap between the reading head 30 and the grating ruler 10. For different models of grating rulers 10, their thicknesses or surface scales may be different, and the corresponding installation gaps when matched with the reading head 30 are also different. Therefore, the design of the waist-shaped hole can make the grating device of this embodiment adapt to grating rulers 10 with different signals, thereby improving the adaptability and versatility of the grating device of this embodiment.

[0041] refer to Figure 3 As shown, the reading head bracket 21 includes two parallel fixed arms 214 and at least two supporting arms 215, the two ends of the supporting arms 215 are respectively connected to the two fixed arms 214, waist-shaped holes are arranged at the two ends of the fixed arms 214, and the second mounting hole 212 is arranged on the fixed arm 214 and located between the two waist-shaped holes.

[0042] The reading head bracket 21 is configured as a bracket structure of two parallel fixed arms 214 and at least two support arms 215, and the two ends of the support arm 215 are respectively connected to the two fixed arms 214. This bracket structure has good stability and can effectively resist external forces from all directions, such as vibration, collision and other external force interference that may occur during operation, ensuring that the reading head 30 and the rolling assembly 22 can be stably installed on the reading head bracket 21, avoiding the situation that the components are loosened and shifted due to structural instability, thereby affecting the measurement accuracy. The two ends of the support arm 215 are respectively connected to the two fixed arms 214, so that the force acting on the fixed arm 214 (such as the force generated by the contact between the rolling assembly 22 and the grating ruler 10, the gravity of the reading head 30, etc.) can be evenly dispersed to the entire bracket structure through the support arm 215, preventing excessive local force, further enhancing the overall bearing capacity of the reading head bracket 21, and ensuring its structural reliability during long-term use. By setting waist-shaped holes (first mounting holes 211) at both ends of the fixed arm 214 and setting the second mounting hole 212 on the fixed arm 214 and between the two waist-shaped holes, such a layout can prevent the rolling component 22 from affecting the reading of grating data by the reading head 30, and the vibration and small displacement generated by the rolling bearing 221 during the movement are not easily directly transmitted to the reading head 30, thereby avoiding the interference of the movement of the rolling bearing 221 on the reading of data by the reading head 30, so that the reading head 30 can more accurately obtain the signal of the grating scale 10, thereby improving the accuracy of the measurement data.

[0043] Furthermore, the support arm 215 is integrally formed with the fixed arm 214. The integrally formed arrangement enables the reading head bracket 21 to form a continuous and complete structure, thereby improving the structural stability of the reading head bracket 21, making it less prone to deformation and breakage, and reducing assembly errors, thereby improving the reading accuracy of the reading head 30.

[0044] Further, the bearing fixing member 222 includes a first connecting screw, a first connecting bolt or a first connecting stud; and / or, the reading head 30 is fixedly mounted on the second mounting hole 212 by a second connecting screw, a second connecting bolt or a second connecting stud. Figure 1 and Figure 2 The bearing fixing member 222 of the embodiment shown in the figure adopts a first connecting bolt, and the reading head 30 is fixedly mounted in the second mounting hole 212 by a second connecting bolt. The rolling bearing 221 and the reading head 30 can be better fixed by the first connecting bolt, the second connecting bolt and the corresponding nut.

[0045] Furthermore, the floating grating device for the cantilever beam also includes a connecting portion 60, which is provided with a mounting groove 61, and the reading head 30 is at least partially installed in the mounting groove 61. The first end of the elastic support member 41 is connected to the connecting portion 60, and the second end of the elastic support member 41 opposite to the first end is connected to the fixing portion 51.

[0046] The mounting groove 61 provided in the connection part 60 provides a special mounting space for the reading head 30, so that the reading head 30 can be accurately and firmly placed therein. Such a mounting method can effectively limit the unnecessary displacement of the reading head 30 within a certain range, and ensure that it is always in a suitable position during the working process, so as to accurately read the signal from the grating ruler 10, and reduce the measurement error caused by factors such as position shaking. The elastic support member 41 is connected to the connection part 60 and the fixed part 51 at its two ends, respectively, to construct a stable support structure capable of realizing floating support, so that the elastic support member 41 can reasonably exert its elastic effect, provide a stable support force for the reading head positioning frame 20, and ensure that the installation gap between the grating ruler 10 and the reading head 30 will not change significantly when the grating ruler 10 moves relative to the reading head 30, so as to ensure the accuracy of the reading of the reading head 30, further improve the measurement accuracy of the grating device of this embodiment, and when subjected to external interference (such as vibration, slight collision, etc.), it can still maintain a relatively stable state, thereby enhancing the anti-interference ability of the entire device.

[0047] refer to Figure 5 As shown, the fixed portion 51 of the cantilever beam of the present embodiment includes a base, on which is provided a reading head mounting base 511 for mounting the reading head 30, and the movable portion 52 includes a cantilever beam assembly 521 and a wire gauge pair 522, the cantilever beam assembly 521 is fixedly connected to the wire gauge pair 522, and the wire gauge pair 522 is installed in the guide rail of the base and can move relative to the length direction of the base.

[0048] Furthermore, a protrusion 411 is provided at the second end of the elastic support member 41, and the elastic support member is fixedly connected to the reading head mounting seat 511 on the fixing portion 51 of the cantilever beam through the protrusion 411. Figure 4 As shown, the protrusion 411 of the elastic support member 41 of the present embodiment is provided with a connecting hole 4111, and the connecting hole 4111 is used to fix the elastic support member 41 to the reading head mounting seat 511 of the fixed part 51 of the cantilever beam through connecting members such as bolts, screws, and pins, which can ensure that the elastic support member 41 is firmly connected to the reading head mounting seat 511, avoid deviation or shaking of the connection position, and ensure the structural stability of the entire device.

[0049] Furthermore, the elastic support member 41 includes a strip spring piece 412, which is always in an elastic deformation state for applying pressure to the reading head 30. The strip spring piece 412 is always in an elastic deformation state, and according to Hooke's law, elastic force will be generated due to the elastic deformation of the spring piece. The elastic force generated by the strip spring piece 412 will act on the components connected thereto, because the elastic support member 41 is connected to the reading head positioning frame 20 through the connecting portion 60, and the reading head mounting seat 511 of the cantilever beam is fixed, so the elastic force generated by the elastic support member 41 will be transmitted to the reading head positioning frame 20. Because the rolling bearing 221 is rotatably connected to the reading head positioning frame 20, when the reading head positioning frame 20 is subjected to the elastic force, the force will be applied to the rolling bearing 221, so that the rolling bearing 221 is always attached to the grating scale 10.

[0050] When the rolling bearing 221 is subjected to pressure from the reading head 30, a contact force will be generated with the surface of the grating ruler 10. The generated contact force is equal in magnitude and opposite in direction to the elastic force of the strip spring piece 412 in a balanced state. Assuming that the rolling bearing 221 is slightly away from the surface of the grating ruler 10 due to the sinking of the movable part 52 of the cantilever beam, the elastic force of the strip spring piece 412 will cause the reading head positioning frame 20 to push the rolling bearing 221 back to a state of close fit with the grating ruler 10, and the elastic force generated by the elastic deformation of the strip spring piece 412 will resist the tendency of the rolling bearing 221 to separate from the surface of the grating ruler 10 until the balance is reached again.

[0051] In this embodiment, since the strip spring piece 412 always provides elastic force, the rolling bearing 221 can always fit tightly on the grating ruler 10, ensuring the installation gap between the reading head 30 and the grating ruler 10, reducing the measurement error caused by too large a change in the installation gap, and ensuring that the reading head 30 can accurately obtain the signal on the grating ruler 10. During the operation of the grating device, the fitting state between the rolling bearing 221 and the grating ruler 10 may change due to factors such as temperature changes, component wear or slight vibrations. The elastically deformed strip spring piece 412 can adaptively adjust the pressure applied to the rolling bearing 221, compensate for the influence of these external factors, maintain the good fit between the rolling bearing 221 and the grating ruler 10, and maintain the stability and measurement accuracy of the grating device. When the device is subjected to external impact force, the strip spring piece 412 of the elastic support member 41 can play a buffering role. Through its own elastic deformation, it absorbs part of the impact force, while ensuring that the rolling bearing 221 will not be excessively separated from the grating ruler 10 due to the impact, reducing the possibility of damage to the device due to external force impact.

[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 addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0054] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A floating grating device for a cantilever beam, the cantilever beam comprising a fixed portion (51) and a movable portion moving relative to the fixed portion (51), characterized in that: The floating grating device comprises: A grating ruler (10), wherein the grating ruler (10) is fixedly mounted on the movable part of the cantilever beam; A reading head (30) and a reading head positioning frame (20), wherein the reading head (30) and the reading head positioning frame (20) are attached to the grating ruler (10) and can move relative to the length direction of the grating ruler (10) when the movable part moves; A reading head (30), the reading head (30) being fixedly connected to the reading head positioning frame (20) of the reading head (30); A push-up assembly (40), the push-up assembly (40) comprising an elastic support member (41), the elastic support member (41) being used to be fixed on the fixing portion (51), the elastic support member (41) being used to apply pressure to the reading head (30) so that the reading head positioning frame (20) of the reading head (30) and the grating ruler (10) remain in close contact.

2. The floating grating device for cantilever beam according to claim 1, characterized in that: The reading head (30) reading head positioning frame (20) comprises a reading head (30) reading head bracket (21) and a rolling assembly (22); the reading head (30) reading head bracket (21) is fixedly connected to the reading head (30); the rolling assembly (22) and the reading head (30) reading head bracket (21) are rotatably connected and fit to the grating scale (10).

3. The floating grating device for cantilever beam according to claim 2, characterized in that: The reading head (30) reading head bracket (21) is provided with a first mounting hole (211) and a second mounting hole (212); the rolling assembly (22) is rotatably connected to the first mounting hole (211); and the reading head (30) is fixed to the reading head bracket (21) of the reading head (30) via a connecting piece (213) passing through the second mounting hole (212).

4. The floating grating device for cantilever beam according to claim 3, characterized in that: The first mounting hole (211) comprises a waist-shaped hole, the length direction of the waist-shaped hole is consistent with the thickness direction of the grating ruler (10), the rolling assembly (22) comprises a plurality of rolling bearings (221) and bearing fixing members (222) corresponding one by one to the plurality of rolling bearings (221), the plurality of rolling bearings (221) are connected to the reading head (30) reading head bracket (21) via the bearing fixing members (222) penetrating the waist-shaped hole, and the bearing fixing members (222) can be fixed at least at different positions in the length direction of the waist-shaped hole.

5. The floating grating device for cantilever beam according to claim 3, characterized in that: The reading head (30) reading head bracket (21) comprises two parallel fixed arms (214) and at least two support arms (215), the two ends of the support arms (215) are respectively connected to the two fixed arms (214), the waist-shaped holes are arranged at the two ends of the fixed arms (214), and the second mounting hole (212) is arranged on the fixed arm (214) and is located between the two waist-shaped holes.

6. The floating grating device for cantilever beam according to claim 5, characterized in that: The support arm (215) and the fixed arm (214) are integrally formed.

7. The floating grating device for a cantilever beam according to claim 4, characterized in that: The bearing fixing member (222) comprises a first connecting screw, a first connecting bolt or a first connecting stud; and / or, The reading head (30) is fixedly mounted on the second mounting hole (212) by means of a second connecting screw, a second connecting bolt or a second connecting stud.

8. The floating grating device for a cantilever beam according to claim 1, characterized in that: The floating grating device for the cantilever beam also includes a connecting portion (60), the connecting portion (60) is provided with a mounting groove (61), the reading head (30) is at least partially mounted in the mounting groove (61), the first end of the elastic support member (41) is connected to the connecting portion (60), and the second end of the elastic support member (41) opposite to the first end is connected to the fixing portion (51).

9. The floating grating device for cantilever beam according to claim 1, characterized in that: The second end of the elastic support member (41) is provided with a protrusion (411), and the elastic support member (41) is fixedly connected to the fixing portion (51) of the cantilever beam via the protrusion (411).

10. The floating grating device for a cantilever beam according to any one of claims 1 to 9, characterized in that: The elastic support member (41) comprises a strip-shaped spring sheet (412), and the strip-shaped spring sheet (412) is always in an elastically deformed state so as to apply pressure to the reading head (30).

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