High-torsional-rigidity electric cylinder with built-in grating

Abstract

The invention discloses a high-torsional-rigidity electric cylinder with a built-in grating, and belongs to the technical field of electric cylinders, the high-torsional-rigidity electric cylinder comprises a transmission main body mechanism and a driving mechanism, and further comprises an anti-rotation mechanism and a linear feedback mechanism, the transmission main body mechanism comprises a cylinder barrel, a piston pipe fitting axially arranged in the cylinder barrel in a sliding mode and a lead screw pair arranged at the position of an inner cavity of the cylinder barrel; the lead screw pair comprises a lead screw piece and a first nut matched with the lead screw piece, the first nut is fixedly connected with the piston pipe fitting, the driving mechanism comprises a driving piece used for driving a lead screw to rotate, the anti-rotation mechanism comprises a linear sliding rail pair, the linear sliding rail pair comprises a sliding rail piece fixed to the piston pipe fitting and a sliding block matched with the sliding rail piece, and the sliding rail piece is fixedly connected with the sliding block. The sliding block is connected with the cylinder barrel, the linear feedback mechanism comprises a grating ruler piece fixed to the piston pipe fitting and moving along with the piston pipe fitting and a reading head used for reading position information of the grating ruler piece, and the reading head is arranged on the cylinder barrel. The device has the advantages that the problems that an external grating ruler piece is large in occupied space, and an anti-rotation key is small in torsional rigidity are solved.

Description

Technical Field

[0001] This invention relates to the field of electric cylinder technology, and in particular to a high torsional rigidity electric cylinder with a built-in grating. Background Technology

[0002] Electric cylinders, as devices that convert rotary motion into linear motion, are widely used in the field of industrial automation. As the requirements for precision and space utilization in automated equipment increase, the design of electric cylinders is constantly being optimized.

[0003] Currently, existing electric cylinders typically use external grating rulers to achieve position feedback. The advantages are convenient installation and simple maintenance, but the disadvantages are that they occupy a lot of space and affect the overall layout of the equipment. In terms of anti-rotation design, existing technologies mostly use anti-rotation keys or guide rods. Anti-rotation keys have a simple structure but insufficient torsional rigidity, while guide rods can improve rigidity but increase complexity and cost.

[0004] In response to the aforementioned technologies, there is an urgent need to design and develop a high torsional rigidity electric cylinder with a built-in grating to solve the problems of large space occupation by external grating rulers and low torsional rigidity of anti-rotation keys. Summary of the Invention

[0005] To address the issues of large space occupation by external grating rulers and low torsional rigidity of anti-rotation keys, this application provides a high torsional rigidity electric cylinder with an internal grating.

[0006] This application provides a high torsional rigidity electric cylinder with a built-in optical grating, employing the following technical solution: A high-torsional-rigidity electric cylinder with a built-in grating includes a transmission main body mechanism and a drive mechanism for driving the transmission main body mechanism, as well as an anti-rotation mechanism and a linear feedback mechanism. The transmission main body mechanism includes a cylinder, a piston tube axially slidably disposed within the cylinder, and a lead screw assembly disposed at a position within the cylinder cavity. The lead screw assembly includes a lead screw and a first nut cooperating with the lead screw, the first nut being fixedly connected to the piston tube. The drive mechanism includes a drive member for driving the lead screw to rotate. The anti-rotation mechanism includes a linear slide rail assembly, the linear slide rail assembly including a slide rail fixed to the piston tube and a slider cooperating with the slide rail, the slider being connected to the cylinder. The linear feedback mechanism includes a grating ruler fixed to the piston tube and moving with it, and a reading head for reading the position information of the grating ruler, the reading head being disposed on the cylinder.

[0007] By adopting the above technical solution, the piston tube is axially slidably disposed within the cylinder, the lead screw is disposed within the cylinder cavity, the first nut cooperates with the lead screw and is fixedly connected to the piston tube, the slide rail is fixed to the piston tube, the slider cooperates with the slide rail and is connected to the cylinder, the grating ruler is fixed to the piston tube, and the reading head is disposed on the cylinder. During the use of this electric cylinder, the lead screw is driven to rotate forward or backward by using the drive unit. This is achieved through the connection of the lead screw, the first nut, and the piston tube, as well as the limiting function of the linear slide rail pair. Under the action of the piston tube, the grating ruler moves in a linear motion of extension or retraction. The reading head can accurately read the position information of the grating ruler. By embedding the grating ruler in the piston tube and setting the reading head on the cylinder, high-precision position measurement is achieved within the original outline dimensions of the electric cylinder, which significantly improves the compactness and space utilization of the entire motion unit. The linear slide rail and the slider are in contact through circulating balls, which is rolling friction, resulting in higher load-bearing efficiency and rigidity, and can withstand greater radial, reverse radial and torsional loads.

[0008] Preferably, the transmission main body mechanism includes a front end cover disposed on the cylinder, a piston tube guide sleeve disposed between the front end cover and the piston tube, and a dustproof ring disposed next to the guide sleeve. The piston tube passes through the front end cover, and the dustproof ring is disposed between the front end cover and the piston tube. Both the piston tube guide sleeve and the dustproof ring have notches for the slide rail to pass through.

[0009] By adopting the above technical solution, the front end cover is set on the cylinder, the piston tube passes through the front end cover, the piston tube guide sleeve is set between the front end cover and the piston tube, and the dustproof ring is set between the front end cover and the piston tube. The dustproof ring is set next to the piston tube guide sleeve. Both the piston tube guide sleeve and the dustproof ring have notches for the slide rail to pass through. During the use of this electric cylinder, the piston tube guide sleeve supports the piston tube to run smoothly, ensuring that the piston tube can still maintain strict linear motion under high speed or high load, preventing radial sway or deflection caused by excessive cantilever or uneven force. The dustproof ring scrapes away external contaminants such as dust, chips, and oil adhering to the outer wall of the piston tube, actively preventing these foreign objects from entering the electric cylinder when the piston tube retracts.

[0010] Preferably, the grating ruler is an absolute grating ruler and is directly attached to the surface of the piston tube using adhesive.

[0011] By adopting the above technical solution, the grating ruler is an absolute value grating ruler, and it is directly pasted onto the surface of the piston tube with adhesive, which facilitates the installation of the grating ruler.

[0012] Preferably, the drive mechanism includes a diaphragm coupling, and the output shaft of the drive member is connected to one end of the lead screw member through the diaphragm coupling. The diaphragm coupling does not have a keyway.

[0013] By adopting the above technical solution, the output shaft of the drive component is connected to one end of the lead screw component through a diaphragm coupling. The diaphragm coupling clamps the motor shaft and the lead screw component by clamping. The diaphragm coupling does not have a keyway, which solves the possibility of transmission motion error caused by the gap between the key and the keyway in the prior art.

[0014] Preferably, the cylinder wall has an axially extending cavity or through groove for accommodating the linear slide rail pair.

[0015] By adopting the above technical solution, the cylinder wall is provided with an axially extending cavity or through groove for accommodating the linear slide rail pair, which facilitates the installation and sliding of the linear slide rail pair.

[0016] Preferably, the slide rail is fixed to the outer circumferential surface of the piston tube by a first connector, and the slider is fixed to the inner wall of the cylinder by a second connector.

[0017] By adopting the above technical solution, the slide rail is fixed to the outer circumferential surface of the piston tube through the first connecting member, which improves the stability of the connection between the slide rail and the piston tube. The slider is fixed to the inner wall of the cylinder through the second connecting member, which improves the stability of the connection between the slider and the cylinder.

[0018] Preferably, the end of the lead screw is provided with a lead screw auxiliary support sleeve, the outer diameter of which is adapted to the inner diameter of the piston tube.

[0019] By adopting the above technical solution, the end of the lead screw is provided with a lead screw auxiliary support sleeve. The outer diameter of the lead screw auxiliary support sleeve is adapted to the inner diameter of the piston tube. The lead screw auxiliary support sleeve assists in supporting the lead screw and improves the sliding stability of the lead screw.

[0020] Preferably, the linear feedback mechanism includes a mounting base disposed on the cylinder and an adjustment unit for finely adjusting the reading gap and parallelism of the reading head relative to the grating ruler. The adjustment unit is disposed on the mounting base, and the reading head is disposed on the mounting base. The reading head is an integrated reading head with its own signal subdivision circuit.

[0021] By adopting the above technical solution, the mounting base is set on the cylinder, the adjustment unit is set on the mounting base, and the reading head is set on the mounting base. The reading head is an integrated reading head with its own signal subdivision circuit. During the use of the electric cylinder, the reading gap and parallelism of the reading head relative to the grating ruler are finely adjusted by the adjustment unit to ensure the accuracy of the reading.

[0022] Preferably, the anti-rotation mechanism includes at least two sets of linear slide rail pairs, which are arranged symmetrically along the circumference of the piston tube.

[0023] By adopting the above technical solution, the anti-rotation mechanism includes at least two sets of linear slide rail pairs, which are symmetrically arranged along the circumference of the piston tube to eliminate the additional bending moment that may be caused by a single slide rail, and greatly improve the overall rigidity, accuracy and life of the electric cylinder when subjected to complex loads.

[0024] Preferably, the transmission main body mechanism further includes a transparent protective cover, which covers the reading area of ​​the grating ruler and the reading head. The protective cover is sealed to the cylinder to form a closed clean air gap space.

[0025] By adopting the above technical solution, the transparent protective cover covers the reading area of ​​the grating ruler and the reading head. The protective cover is sealed to the cylinder to form a closed clean air gap space. The transparent protective cover isolates the contaminants and does not affect the optical reading, which significantly improves the environmental adaptability and reliability of the product and broadens its application prospects in harsh industrial environments.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. The piston tube is axially slidably disposed within the cylinder. The lead screw is disposed within the cylinder cavity. The first nut engages with the lead screw and is fixedly connected to the piston tube. The slide rail is fixed to the piston tube. The slider engages with the slide rail and is connected to the cylinder. The grating ruler is fixed to the piston tube. The reading head is disposed on the cylinder. During the use of this electric cylinder, the lead screw is driven to rotate forward or backward by the drive unit. Under the connecting action of the lead screw, the first nut, and the piston tube, and the limiting action of the linear slide rail pair, the cylinder rotates... The piston tube drives the grating ruler to extend or retract in a linear motion. The reading head can accurately read the position information of the grating ruler. By embedding the grating ruler in the piston tube and setting the reading head on the cylinder, high-precision position measurement is achieved within the original outline dimensions of the electric cylinder, which significantly improves the compactness and space utilization of the entire motion unit. The linear slide rail and the slider are in contact through circulating balls, which is rolling friction, resulting in higher load-bearing efficiency and rigidity, and can withstand greater radial, reverse radial and torsional loads. 2. The front end cover is mounted on the cylinder barrel, the piston tube passes through the front end cover, the piston tube guide sleeve is positioned between the front end cover and the piston tube, and the dust seal is positioned between the front end cover and the piston tube, next to the piston tube guide sleeve. Both the piston tube guide sleeve and the dust seal have notches for the slide rail to pass through. During the use of this electric cylinder, the piston tube guide sleeve supports the piston tube to run smoothly, ensuring that the piston tube can maintain strict linear motion under high speed or high load, preventing radial sway or deflection caused by excessive cantilever length or uneven force. The dust seal scrapes away dust, chips, oil, and other external contaminants adhering to the outer wall of the piston tube, actively preventing these foreign objects from entering the electric cylinder when the piston tube retracts. 3. A transparent protective cover extends beyond the reading area of ​​the grating ruler and the reading head. The protective cover is sealed to the cylinder, forming a closed, clean air gap space. The transparent protective cover isolates contaminants without affecting optical readings, significantly improving the product's environmental adaptability and reliability, and broadening its application prospects in harsh industrial environments. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of a high torsional rigidity electric cylinder with a built-in grating in an embodiment of this application.

[0028] Figure 2 This is a schematic diagram of the internal structure of the cylinder in an embodiment of this application.

[0029] Figure 3 yes Figure 2 A magnified view of a portion of point A in the middle.

[0030] Figure 4 This is a schematic diagram of the internal structure of the front cover in an embodiment of this application.

[0031] Explanation of reference numerals in the attached figures: 1. Transmission main body mechanism; 11. Front end connector; 12. Cylinder; 13. Front end cover; 131. Threaded hole; 14. Piston fitting; 15. Piston tube guide sleeve; 16. Lead screw pair; 161. Lead screw fitting; 162. First nut; 163. Lead screw auxiliary support sleeve; 17. Dustproof ring; 18. First screw; 19. Wear ring; 111. Bearing chamber; 112. Ball bearing; 113. Bearing sleeve; 114. Bearing nut; 115. Shaft elastic retaining ring; 2. Drive mechanism; 21. Drive component; 22. Adapter plate; 23. Diaphragm coupling; 24. Second screw; 25. Coupling housing; 151. Observation hole; 26. Cover plate; 3. Anti-rotation mechanism; 31. Linear slide rail pair; 32. Slide rail fitting; 33. Slider; 4. Linear feedback mechanism; 41. Grating scale fitting; 42. Mounting base; 43. Reading head. Detailed Implementation

[0032] The present application will be further described in detail below with reference to the accompanying drawings.

[0033] This application discloses a high torsional rigidity electric cylinder with a built-in grating. Example

[0034] Reference Figure 1 and Figure 2 As shown, a high torsional rigidity electric cylinder with built-in grating includes a transmission main body mechanism 1, a drive mechanism 2, an anti-rotation mechanism 3, and a linear feedback mechanism 4.

[0035] Reference Figure 1 , Figure 2 and Figure 3 As shown, the transmission main body mechanism 1 includes a front end connector 11, a cylinder 12, a front end cover 13, a piston tube 14, a piston tube guide sleeve 15, a lead screw pair 16, a dustproof ring 17, a first screw 18, a wear-resistant ring 19, a bearing chamber 111, a ball bearing 112, a bearing sleeve 113, a bearing nut 114, and a shaft elastic retaining ring 115.

[0036] Reference Figure 1 and Figure 2 As shown, the lead screw assembly 16 includes a lead screw component 161 and a first nut 162. Both the lead screw component 161 and the first nut 162 are disposed in the inner cavity of the cylinder 12. The lead screw component 161 is coaxial with the cylinder 12. The first nut 162 is sleeved on the lead screw component 161 and is connected to the lead screw component 161. The first nut 162 is coaxial with the lead screw component 161. The first nut 162 can be a high-precision ball nut or planetary nut. In this embodiment, a ball nut is preferred.

[0037] Reference Figure 1 and Figure 2 As shown, the drive mechanism 2 includes a drive component 21, an adapter plate 22, a diaphragm coupling 23, a second screw 24, a coupling housing 25, and a cover plate 26. The drive component 21 is mounted on the adapter plate 22, and the adapter plate 22 can be adjusted according to the size of the drive component 21. In this embodiment, the drive component 21 is preferably a servo motor.

[0038] Reference Figure 1 and Figure 2 As shown, the output shaft of the drive unit 21 is connected to one end of the lead screw 161 through the diaphragm coupling 23. The diaphragm coupling 23 clamps the servo motor shaft and the lead screw 161 by clamping. The diaphragm coupling 23 does not have a keyway, which solves the possibility of transmission motion error caused by the gap between the key and the keyway in the prior art.

[0039] Reference Figure 1 and Figure 2As shown, the coupling housing 25 is connected to the adapter plate 22, the diaphragm coupling 23 is disposed inside the coupling housing 25, an observation hole 151 is provided on the side of the coupling housing 25, and the cover plate 26 is connected to the coupling housing 25 by the second screw 24. The cover plate 26 can seal the observation hole 151 to prevent foreign objects from entering the coupling housing 25.

[0040] Reference Figure 1 and Figure 2 As shown, one end of the bearing housing 111 is connected to the coupling housing 25, and the other end of the bearing housing 111 is connected to the cylinder 12 by screws. The ball bearing 112, the bearing sleeve 113, and the bearing nut 114 are all located in the bearing housing 111. The ball bearing 112 is used to support the lead screw 161. The bearing sleeve 113 presses the outer ring of the ball bearing 112, and the bearing nut 114 presses the inner ring of the ball bearing 112.

[0041] Reference Figure 1 and Figure 2 As shown, the piston tube 14 is axially slidably disposed inside the cylinder 12. The piston tube 14 and the cylinder 12 are coaxial. The front end connector 11 is disposed next to the piston tube 14. One end of the piston tube 14 is threadedly connected to the front end connector 11, and the other end of the piston tube 14 is connected to the first nut 162 through the first screw 18.

[0042] Reference Figure 1 , Figure 2 and Figure 3 As shown, the front cover 13 is disposed on the cylinder 12 and is coaxial with the cylinder 12. A threaded hole 131 is provided on the side of the front cover 13 to facilitate connection with other devices through the threaded hole 131. The piston tube 14 passes through the front cover 13. The piston tube guide sleeve 15 is disposed between the front cover 13 and the piston tube 14 and is coaxial with the front cover 13. The dustproof ring 17 is disposed between the front cover 13 and the piston tube 14 and is disposed next to the piston tube guide sleeve 15 and is coaxial with the front cover 13. Both the piston tube guide sleeve 15 and the dustproof ring 17 have notches for the slide rail 32 to pass through. Reference Figure 1 , Figure 2 and Figure 3 As shown, during the use of this electric cylinder, the piston tube guide sleeve 15 supports the piston tube 14 to run smoothly, ensuring that the piston tube 14 can maintain strict linear motion under high speed or high load, and preventing radial sway or deflection caused by excessive cantilever or uneven force; the dust ring 17 scrapes away external contaminants such as dust, chips, and oil adhering to the outer wall of the piston tube, actively preventing these foreign objects from entering the electric cylinder when the piston tube retracts.

[0043] Reference Figure 1 and Figure 2As shown, the end of the lead screw 161 is provided with a lead screw auxiliary support sleeve 163. The outer diameter of the lead screw auxiliary support sleeve 163 is adapted to the inner diameter of the piston tube. The lead screw auxiliary support sleeve 163 provides auxiliary support for the lead screw 161 and improves the sliding stability of the lead screw 161. A shaft elastic retainer 115 is provided on the lead screw 161. The shaft elastic retainer 115 is coaxial with the lead screw 161 and can fix the lead screw auxiliary support sleeve 163.

[0044] Reference Figure 1 and Figure 2 As shown, the wear-resistant ring 19 is sleeved on the piston tube 14. The wear-resistant ring 19 is coaxial with the piston tube 14 and is located between the piston tube 14 and the cylinder 12. The wear-resistant ring 19 assists in supporting the piston tube 14, making the operation of the piston tube 14 more stable.

[0045] Reference Figure 1 As shown, the anti-rotation mechanism 3 includes a linear slide rail pair 31. The cylinder wall of the cylinder 12 has an axially extending cavity or through groove for accommodating the linear slide rail pair 31, which facilitates the installation and sliding of the linear slide rail pair 31.

[0046] Reference Figure 1 , Figure 2 and Figure 4 As shown, the linear slide rail pair 31 includes a slide rail component 32 and a slider 33. The slide rail is fixed to the outer peripheral surface of the piston tube component 14 through a first connecting member, which improves the stability of the connection between the slide rail and the piston tube component 14. The slider 33 is fixed to the inner wall of the cylinder 12 through a second connecting member, which improves the stability of the connection between the slider 33 and the cylinder 12. The slide rail component 32 and the slider 33 slide together. In this embodiment, both the first connecting member and the second connecting member are screws.

[0047] Reference Figure 1 , Figure 2 and Figure 4 As shown, the anti-rotation mechanism 3 includes at least two sets of linear slide rail pairs 31. In this embodiment, it is preferably configured as two sets of linear slide rail pairs 31. The two sets of linear slide rail pairs 31 are symmetrically arranged along the circumference of the piston tube to eliminate the additional bending moment that may be caused by a single slide rail, which greatly improves the overall rigidity, accuracy and life of the electric cylinder when subjected to complex loads.

[0048] Reference Figure 1 and Figure 2 As shown, the linear feedback mechanism 4 includes a grating ruler 41, a mounting base 42, an adjustment unit, and a reading head 43. A rectangular space is provided on the cylinder 12 for mounting the grating ruler 41 and the reading head 43, and an outlet for the cables of the grating ruler 41 and the reading head 43 is provided on the cylinder 12.

[0049] Reference Figure 1 and Figure 2As shown, the grating ruler 41 is fixed on the piston tube 14, the mounting base 42 is set on the cylinder 12, the adjustment unit is set on the mounting base 42, and the reading head 43 is set on the mounting base 42. The reading head 43 is an integrated reading head 43 with its own signal subdivision circuit. During the use of the electric cylinder, the reading gap and parallelism of the reading head 43 relative to the grating ruler 41 are finely adjusted by the adjustment unit to ensure the accuracy of the reading. By using the drive unit 21 to drive the lead screw 161 to rotate in the forward or reverse direction, under the connection of the lead screw 161, the first nut 162, the piston tube 14 and the limiting action of the linear slide rail pair 31, the piston tube 14 drives the grating ruler 41 to make a linear motion of extension or retraction, and the reading head 43 can accurately read the position information of the grating ruler 41. Furthermore, by embedding the grating ruler 41 on the piston tube 14 and setting the reading head 43 on the cylinder 12, high-precision position measurement is achieved within the original outline dimensions of the electric cylinder, significantly improving the compactness and space utilization of the entire motion unit. The linear slide rail pair 31 and the slider 33 are in contact through circulating balls, which is rolling friction, resulting in higher load-bearing efficiency and rigidity, and the ability to withstand greater radial, reverse radial and torsional loads.

[0050] Reference Figure 1 and Figure 2 As shown, the grating ruler 41 is an absolute grating ruler, and it is directly attached to the surface of the piston tube 14 with adhesive backing, which facilitates the installation of the grating ruler 41.

[0051] The implementation principle of Example 1 is as follows: During the use of the electric cylinder, the reading gap and parallelism of the reading head 43 relative to the grating ruler 41 are adjusted by the adjustment unit to ensure the accuracy of the reading. The lead screw 161 is driven to rotate in the forward or reverse direction by the drive unit 21. Under the connection of the lead screw 161, the first nut 162, the piston tube 14 and the limiting action of the linear slide rail pair 31, the piston tube 14 drives the grating ruler 41 to make a linear motion of extension or retraction. The reading head 43 can accurately read the position information of the grating ruler 41. By embedding the grating ruler 41 on the piston tube 14 and setting the reading head 43 on the cylinder 12, high-precision position measurement is achieved within the original outline dimensions of the electric cylinder, significantly improving the compactness and space utilization of the entire motion unit. The linear slide rail pair 31 and the slider 33 make contact through circulating balls, which is rolling friction, resulting in higher load-bearing efficiency and rigidity, and can withstand greater radial, reverse radial and torsional loads. Example

[0052] Reference Figure 1 and Figure 2As shown, the transmission main body mechanism 1 also includes a transparent protective cover, which covers the reading area of ​​the grating ruler 41 and the reading head 43. The protective cover is sealed to the cylinder 12 to form a closed clean air gap space.

[0053] The implementation principle of Example 2 is as follows: A transparent protective cover covers the reading area of ​​the grating ruler 41 and the reading head 43. The protective cover is sealed to the cylinder 12 to form a closed clean air gap space. The transparent protective cover isolates the contaminants without affecting the optical reading, which significantly improves the environmental adaptability and reliability of the product and broadens its application prospects in harsh industrial environments.

[0054] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A high torsional rigidity electric cylinder with built-in grating, comprising a transmission main body mechanism (1) and a drive mechanism (2) for driving the transmission main body mechanism (1), characterized in that: It also includes an anti-rotation mechanism (3) and a linear feedback mechanism (4). The transmission main body mechanism (1) includes a cylinder (12), a piston tube (14) axially slidingly disposed in the cylinder (12), and a lead screw pair (16) disposed in the inner cavity of the cylinder (12). The lead screw pair (16) includes a lead screw (161) and a first nut (162) cooperating with the lead screw (161). The first nut (162) is fixedly connected to the piston tube (14). The drive mechanism (2) includes a drive component for driving the lead screw (161) to rotate. (21) The anti-rotation mechanism (3) includes a linear slide rail pair (31), which includes a slide rail (32) fixed on the piston tube (14) and a slider (33) cooperating with the slide rail (32). The slider (33) is connected to the cylinder (12). The linear feedback mechanism (4) includes a grating ruler (41) fixed on the piston tube (14) and moving with it, and a reading head (43) for reading the position information of the grating ruler (41). The reading head (43) is disposed on the cylinder (12).

2. The high torsional rigidity electric cylinder with built-in grating according to claim 1, characterized in that: The transmission main body mechanism (1) includes a front end cover (13) disposed on the cylinder (12), a piston tube guide sleeve (15) disposed between the front end cover (13) and the piston tube (14), and a dustproof ring (17) disposed next to the guide sleeve. The piston tube (14) passes through the front end cover (13), and the dustproof ring (17) is disposed between the front end cover (13) and the piston tube (14). The piston tube guide sleeve (15) and the dustproof ring (17) are both provided with notches for the slide rail (32) to pass through.

3. The high torsional rigidity electric cylinder with built-in grating according to claim 1, characterized in that: The grating ruler (41) is an absolute value grating ruler, and it is directly attached to the surface of the piston tube (14) with adhesive backing.

4. A high torsional rigidity electric cylinder with built-in grating according to claim 1, characterized in that: The drive mechanism (2) includes a diaphragm coupling (23). The output shaft of the drive member (21) is connected to one end of the lead screw member (161) through the diaphragm coupling (23). The diaphragm coupling (23) does not have a keyway.

5. A high torsional rigidity electric cylinder with built-in grating according to claim 1, characterized in that: The cylinder wall (12) has an axially extending cavity or through groove for accommodating the linear slide rail pair (31).

6. A high torsional rigidity electric cylinder with built-in grating according to claim 1, characterized in that: The slide rail is fixed to the outer circumferential surface of the piston tube (14) by the first connector, and the slider (33) is fixed to the inner wall of the cylinder (12) by the second connector.

7. A high torsional rigidity electric cylinder with built-in grating according to claim 1, characterized in that: The end of the lead screw (161) is provided with a lead screw auxiliary support sleeve (163), the outer diameter of which is adapted to the inner diameter of the piston tube.

8. A high torsional rigidity electric cylinder with built-in grating according to claim 1, characterized in that: The linear feedback mechanism (4) includes a mounting base (42) disposed on the cylinder (12) and an adjustment unit for finely adjusting the reading gap and parallelism of the reading head (43) relative to the grating ruler (41). The adjustment unit is disposed on the mounting base (42), and the reading head (43) is disposed on the mounting base (42). The reading head (43) is an integrated reading head (43) with its own signal subdivision circuit.

9. A high torsional rigidity electric cylinder with built-in grating according to claim 1, characterized in that: The anti-rotation mechanism (3) includes at least two sets of linear slide rail pairs (31), which are arranged symmetrically along the circumference of the piston tube.

10. A high torsional rigidity electric cylinder with built-in grating according to claim 1, characterized in that: The transmission main body mechanism (1) also includes a transparent protective cover, which covers the reading area of ​​the grating ruler (41) and the reading head (43). The protective cover is sealed to the cylinder (12) to form a closed clean air gap space.

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