Forward screw integrated electric cylinder

Abstract

The application discloses a forward screw integrated electric cylinder and belongs to the technical field of electric cylinders. The electric cylinder comprises a rotating sleeve, a screw and a locking nut. The rotating sleeve is fixedly installed in a rotor. A central through hole for installing the screw is formed in the rotating sleeve, and the central through hole is provided with an inner taper surface. A power input section of the screw is provided with an outer taper surface matched with the inner taper surface. The screw is arranged in the rotating sleeve, and the outer taper surface is arranged in close contact with the inner taper surface. A threaded section is arranged at the end of the power input section. The locking nut is matched with the threaded section to exert an axial pre-tightening force on the end surface of the rotating sleeve. The outer taper surface of the screw is in full-area close contact with the inner taper surface of the rotating sleeve. After the locking nut is tightened, a continuous axial pre-tightening force is exerted on the screw, so that the inner and outer taper surfaces are elastically over-tightened and tightly hold. The radial gap and axial movement between the screw and the rotating sleeve are eliminated from the source. The electric cylinder realizes non-empty stroke, zero-backlash torque transmission, improves the instantaneous response accuracy and the consistency of reciprocating positioning.

Description

Technical Field

[0001] This invention relates to the field of electric cylinder technology, and in particular to a positive lead screw integrated electric cylinder. Background Technology

[0002] In existing lead screw drive motors, torque transmission between the motor rotor and the lead screw generally adopts a keyed connection. This keyed connection requires a keyway to be cut into the lead screw shaft, resulting in assembly clearances between the key and keyway, and between the mating surfaces of the coupling. These clearances are structural and cannot be completely eliminated through assembly processes. Therefore, during torque transmission, the mating surfaces undergo a process of "clearance elimination—contact—force transmission by compression," generating transmission backlash and affecting instantaneous response accuracy and reciprocating positioning consistency. Furthermore, under high-frequency reciprocating and heavy-load impact conditions, the mating surfaces are subjected to alternating contact stress, resulting in continuous wear and a gradual increase in clearance. This cumulative increase in clearance directly leads to increased radial runout of the lead screw, increased transmission backlash, and continuous deterioration of repeatability, failing to meet the requirements for long-term high-precision and stable operation.

[0003] Therefore, there is an urgent need to design a positive lead screw integrated electric cylinder to solve the technical problem of unstable operating accuracy caused by the flat key connection method in the existing technology. Summary of the Invention

[0004] This invention provides a positive lead screw integrated electric cylinder to solve the technical problem of unstable operating accuracy caused by the flat key connection method in the prior art.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: This invention provides a forward-rotating screw integrated electric cylinder, comprising a cylinder body, a stator and a rotor disposed within the cylinder body, including: A rotating sleeve, a lead screw, and a locking nut; the rotating sleeve is fixedly installed inside the rotor, the rotating sleeve has a central through hole for installing the lead screw, and the central through hole is provided with an inner conical surface, the power input section of the lead screw is provided with an outer conical surface that matches the inner conical surface, the lead screw passes through the rotating sleeve, and the outer conical surface is fitted to the inner conical surface; The end of the power input section is provided with a threaded section, and the locking nut cooperates with the threaded section to apply an axial preload to the end face of the rotating sleeve.

[0006] Furthermore, a shoulder is provided on the power input section, and the shoulder abuts against the rotating sleeve.

[0007] Furthermore, the shoulder is provided with a positioning protrusion extending toward the rotating sleeve, and the rotating sleeve is provided with a positioning groove that adapts to the positioning protrusion, and the depth of the positioning groove is greater than the length of the positioning protrusion.

[0008] Furthermore, this also includes locking bolts; The shoulder of the shaft has a positioning hole parallel to the lead screw, and the rotating sleeve has a threaded hole at the position corresponding to the positioning hole. The locking bolt passes through the positioning hole and engages with the threaded hole to apply an axial locking force to the rotating sleeve.

[0009] Furthermore, the threaded section is provided with a left-hand thread and a right-hand thread, and two locking nuts are provided, namely a fastening nut and a limiting nut, and the fastening nut and the limiting nut respectively mate with the left-hand thread and the right-hand thread. The fastening nut abuts against the end face of the rotating sleeve, and the limiting nut abuts against the fastening nut.

[0010] Furthermore, the outer surface of the power output section of the lead screw is provided with external threads; The cylinder body is provided with a power tube coaxially arranged with the lead screw. A transmission nut that mates with the external thread is installed in the power tube. The outer wall of the power tube is provided with a guide surface. The cylinder body is provided with a guide hole that matches the guide surface of the power tube. When the lead screw rotates, the power tube moves back and forth along the axial direction of the lead screw through the cooperation of the transmission nut and the guide hole.

[0011] Furthermore, the guide surface consists of six guide planes disposed on the outer wall of the power pipe and evenly distributed along the circumference of the power pipe; A limiting guide is fixed inside the cylinder. The limiting guide has a regular hexagonal through hole. The power pipe passes through the regular hexagonal through hole and slides with it to constrain the circumferential rotation of the power pipe.

[0012] Furthermore, dustproof scrapers are respectively embedded at the end face of the limiting guide member. The inner hole of the dustproof scraper is a hexagonal scraping opening adapted to the outer contour of the power pipe, and the inner wall of the dustproof scraper is tightly fitted to the outer wall of the power pipe. The dustproof scraper is provided with a dustproof retaining ring on its outer side, which is used to press and fix the dustproof scraper.

[0013] Furthermore, it also includes a bearing system installed in the cylinder body, the bearing system comprising a main load bearing and an auxiliary support bearing; The main bearing and the auxiliary support bearing are located at the middle and far ends of the rotating sleeve, respectively. The inner ring of the main bearing is interference-fitted with the lead screw, and the inner ring of the auxiliary support bearing is clearance-fitted with the lead screw.

[0014] Furthermore, the cylinder body is provided with a cooling structure in the mounting area corresponding to the stator; the cooling structure includes heat exchange channels disposed in the cylinder body wall and evenly distributed along the circumference of the cylinder body; the two ends of the heat exchange channels are respectively provided with liquid inlet and liquid outlet.

[0015] Compared with the prior art, the technical solution disclosed in this invention has the following beneficial effects: In this invention, the outer conical surface of the lead screw and the inner conical surface of the rotating sleeve are fully engaged. After the locking nut is tightened, a continuous axial preload is applied to the lead screw, causing the inner and outer conical surfaces to elastically interfere with each other, thereby eliminating the radial clearance and axial movement between the lead screw and the rotating sleeve from the source, realizing zero backlash torque transmission, and improving the instantaneous response accuracy and reciprocating positioning consistency. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of the integrated electric cylinder with a positive lead screw in an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the dustproof scraper in an embodiment of the present invention; Figure 3 This is a schematic diagram of the bearing system in an embodiment of the present invention; Figure 4 This is a schematic diagram of the heat exchange channel in an embodiment of the present invention.

[0018] The components are: 1. Cylinder block; 2. Stator; 3. Rotating sleeve; 4. Lead screw; 5. Locking nut; 6. Shoulder; 7. Power pipe; 8. Transmission nut; 9. Main bearing; 10. Auxiliary support bearing; 11. Positioning bearing assembly; 12. Heat exchange channel; 13. Dustproof scraper; 14. Dustproof retaining ring. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] This invention provides a positive lead screw integrated electric cylinder to solve the technical problem of unstable operating accuracy caused by the flat key connection method in the prior art.

[0022] refer to Figure 1 The positive lead screw integrated electric cylinder disclosed in this embodiment of the invention includes a cylinder body 1, a stator 2 and a rotor disposed within the cylinder body 1, and also includes a rotating sleeve 3, a lead screw 4 and a locking nut 5. The rotating sleeve 3 is fixedly installed inside the rotor. The rotating sleeve 3 has a central through hole for mounting the lead screw 4, and the central through hole is provided with an inner conical surface. The power input section of the lead screw 4 is provided with an outer conical surface that matches the inner conical surface. The lead screw 4 passes through the rotating sleeve 3, and the outer conical surface fits against the inner conical surface. The end of the power input section is provided with a threaded section. The locking nut 5 cooperates with the threaded section to apply an axial preload to the end face of the rotating sleeve 3.

[0023] Because existing flat key connections have assembly gaps at the mating surfaces, the torque transmission path inevitably involves gap elimination, contact, and compression transmission processes, resulting in transmission backlash. In this application, the outer conical surface of the lead screw 4 and the inner conical surface of the rotating sleeve 3 are fully engaged. After tightening the locking nut 5, a continuous axial preload is applied to the lead screw 4, causing the inner and outer conical surfaces to elastically clamp together. This eliminates the radial gap and axial movement between the lead screw 4 and the rotating sleeve 3 at the source, achieving zero-backlash torque transmission and improving instantaneous response accuracy and reciprocating positioning consistency. Simultaneously, because the axial preload applied by the locking nut 5 keeps the conical mating pair in an elastically clamped state, when minor wear occurs at the conical contact area within a preset range, the preload pushes the rotating sleeve 3 to produce a slight axial displacement to compensate for the wear, thus ensuring that the inner and outer conical surfaces always maintain full engagement. Therefore, the presence of the preload ensures that the transmission accuracy does not decrease due to wear and thermal deformation throughout its entire lifespan. Based on this, compared with the technical problems of relying on manual centering and easily introducing eccentricity error in flat key connection, the fit between the outer conical surface of the lead screw 4 and the inner conical surface of the rotating sleeve 3 can automatically correct the coaxiality of the lead screw 4 and the rotating sleeve 3 by utilizing the geometric characteristics of the conical surface during the assembly process, reducing assembly difficulty, reducing eccentricity error, and improving transmission smoothness.

[0024] It should be noted that the rotating sleeve 3 and the rotor of this application can be set as an integral molding structure, which can avoid the coaxiality deviation and fitting clearance generated when the rotating sleeve 3 is processed separately and then pressed into the rotor to the greatest extent. Therefore, the self-centering correction datum of the conical surface is directly established on the rotor body, eliminating the cumulative error introduced by the intermediate assembly process, and significantly improving the upper limit of the coaxiality accuracy of the lead screw 4.

[0025] In this embodiment, a shoulder 6 is provided on the power input section, and the shoulder 6 abuts against the rotating sleeve 3. The shoulder 6 provides a clear limiting reference during the axial installation of the lead screw 4. During assembly, simply inserting the lead screw 4 into the rotating sleeve 3 and, with the action of the locking nut 5, installing the rotating sleeve 3 until it fits against the shoulder 6, quickly determines the axial position of the lead screw 4, significantly reducing assembly difficulty and human error. Simultaneously, the shoulder 6 abuts against the end face of the rotating sleeve 3, forming a bidirectional axial limiting mechanism with the locking nut 5, improving stability.

[0026] In this embodiment, a positioning protrusion extending towards the rotating sleeve 3 is provided on the shoulder 6, and a positioning groove adapted to the positioning protrusion is provided on the rotating sleeve 3, with the depth of the positioning groove being greater than the length of the positioning protrusion. The positioning protrusion is embedded in the positioning groove, forming an embedded fit, thereby further improving the torque transmission strength. At the same time, the groove depth is greater than the protrusion length, reserving space for axial adjustment during assembly, avoiding the protrusion from jamming due to accumulated dimensional tolerances, thus preventing the conical surface from being completely fitted and ensuring that the conical surface is always in an elastic interference state. For those skilled in the art, multiple positioning protrusions and corresponding positioning grooves can be provided, which is not specifically limited here, and it is preferred that the positioning protrusions be evenly distributed along the circumference of the shoulder 6 to improve the uniformity of force and dynamic balance performance.

[0027] This embodiment also includes a locking bolt; a positioning hole parallel to the lead screw 4 is provided on the shoulder 6, and a threaded hole is provided on the rotating sleeve 3 at the position corresponding to the positioning hole. The locking bolt passes through the positioning hole and engages with the threaded hole to apply an axial locking force to the rotating sleeve 3. The locking nut 5 and the locking bolt can form two independent axial preload application paths, constructing a double locking mechanism between the lead screw 4 and the rotating sleeve 3. During operation, if either preload path loosens due to vibration or fails due to fatigue, the other path can still independently maintain the conical surface clamping state. Especially under alternating loads and vibration environments, there is a risk of slow loosening of threaded connections. In this invention, the locking nut 5 and the locking bolt are mechanically independent, and their loosening trends are asynchronous and uncoupled. Even if the locking nut 5 loosens slightly due to vibration, the locking bolt continues to maintain the axial locking state of the rotating sleeve 3, preventing a sudden drop in the conical surface clamping force, thereby improving the reliability of operation to a certain extent.

[0028] Based on this, the positioning protrusion on the shoulder 6 is embedded in the positioning groove of the rotating sleeve 3 to achieve radial positioning and circumferential anti-rotation. The locking bolt passes through the positioning hole of the shoulder 6 and engages with the threaded hole of the rotating sleeve 3 to apply axial locking force. The two engagement relationships are structurally interconnected and functionally synergistically enhanced, jointly improving the connection strength between the rotating sleeve 3 and the lead screw 4. It should be noted that the positioning hole and the positioning protrusion can be arranged in a staggered manner, or the positioning hole can be opened on the positioning protrusion and the threaded hole can be opened in the positioning groove on the rotating sleeve 3. The specific arrangement can be reasonably planned by those skilled in the art according to the dimensions of the shoulder 6.

[0029] In this embodiment, the threaded section has left-hand and right-hand threads. Two locking nuts 5 are provided: a fastening nut and a limiting nut. The fastening nut and the limiting nut respectively engage with the left-hand and right-hand threads. The fastening nut abuts against the end face of the rotating sleeve 3, and the limiting nut abuts against the fastening nut. The fastening nut and the limiting nut are respectively located on the left-hand and right-hand threads of the threaded section. The fastening nut applies an axial preload to the end face of the rotating sleeve 3, and the limiting nut abuts against the end face of the fastening nut. When the equipment operates and generates vibration or alternating impact loads, if the fastening nut tends to loosen along the thread direction, the abutting force between it and the limiting nut will increase accordingly. The limiting nut provides a counteracting torque through its reverse thread, preventing the fastening nut from loosening. This structure forms a pair of motion constraints, preventing the fastening nut from loosening independently and fundamentally eliminating the loosening of the locking nut 5 due to vibration and impact. In addition, to further improve the locking effect, a spring washer or a disc washer can be placed between the mating surfaces of the fastening nut and the limiting nut.

[0030] In this embodiment, the outer surface of the power output section of the lead screw 4 is provided with an external thread; a power pipe 7 coaxially arranged with the lead screw 4 is provided inside the cylinder body 1, and a transmission nut 8 that mates with the external thread is installed inside the power pipe 7. The outer wall of the power pipe 7 is provided with a guide surface, and the cylinder body 1 is provided with a guide hole that matches the guide surface of the power pipe 7. When the lead screw 4 rotates, the power pipe 7 reciprocates along the axial direction of the lead screw 4 through the cooperation of the transmission nut 8 and the guide hole. During operation, the external thread of the lead screw 4 and the transmission nut 8 inside the power pipe 7 form a threaded transmission pair, converting the rotational motion of the lead screw 4 into the axial linear motion of the power pipe 7. At the same time, the guide surface of the outer wall of the power pipe 7 slides with the guide hole of the cylinder body 1, circumferentially limiting the power pipe 7, ensuring that the power pipe 7 only has axial translational freedom during reciprocating movement and does not rotate with the lead screw 4. When the lead screw 4 rotates, the transmission nut 8 is constrained by the guide hole and cannot rotate, thus moving along the thread axial direction, causing the power pipe 7 to extend or retract. As a further optimization, the guide surface consists of six guide planes evenly distributed around the circumference of the power pipe 7, located on the outer wall of the power pipe 7. A limiting guide is fixed inside the cylinder body 1, and the limiting guide has a regular hexagonal through hole. The power pipe 7 passes through the regular hexagonal through hole and slides with it to constrain the circumferential rotation of the power pipe 7. The six guide planes form a regular hexagon on the cross-section of the power pipe 7, thus engaging with the regular hexagonal through hole.

[0031] It should be noted that in this embodiment, "forward" specifically refers to the direct drive of the motor rotor and the lead screw 4 coaxially connected in series, with the lead screw 4 acting as the active rotating component to drive the transmission nut 8 to output linearly along the same axis, and the transmission path and direction of the force transmission being completely without reversal. At the same time, "integrated electric cylinder" specifically refers to a cylinder body 1 as the load-bearing base, with the transmission structure integrated inside the motor rotor, requiring no external independent parts or independent assembly.

[0032] Because existing technologies generally employ a fragmented layout of separate motors and transmission mechanisms, taking a reversible electric cylinder as an example, intermediate conversion links such as synchronous belts and gears are required. Power from the motor to the lead screw 4 needs to be transmitted through multiple stages such as couplings, belts, or gears. However, in this embodiment, the rotating sleeve 3 is fixedly installed inside the rotor, and the lead screw 4 passes through the rotating sleeve 3 with its conical surface in contact. The locking nut 5 applies axial preload, which limits the coaxial connection of the motor rotor, rotating sleeve 3, and lead screw 4. Power is transmitted linearly along the axial direction, which not only enables the transmission chain to be minimized and without backlash, thereby achieving instantaneous torque response speed and high-precision transmission path, but also minimizes the radial dimension of the entire machine. This eliminates the defects of external power transmission structures in existing technologies that are prone to dust accumulation and wear, and significantly improves long-term operational reliability and adaptability to confined spaces.

[0033] refer to Figure 2In this embodiment, a dustproof scraper 13 is embedded at the end face of the limiting guide. The inner hole of the dustproof scraper 13 is a hexagonal scraping opening adapted to the outer contour of the power pipe 7, and the inner wall of the dustproof scraper 13 is tightly fitted to the outer wall of the power pipe 7. A dustproof retaining ring 14 is provided on the outer side of the dustproof scraper 13, which is used to press and fix the dustproof scraper 13. The inner hole of the dustproof scraper 13 is set as a hexagonal scraping opening adapted to the outer contour of the power pipe 7. The six inner wall surfaces of the scraping opening correspond one-to-one with the six outer wall surfaces of the hexagonal power pipe 7 and are tightly fitted. When the power pipe 7 moves in extension and retraction, the inner wall of the scraping opening slides along the outer wall of the power pipe 7 throughout the entire process, and the dust, cutting fluid, oil and other foreign objects attached to the outer wall of the power pipe 7 are completely scraped off before entering the limiting guide. Compared to traditional circular sealing rings, which only provide circumferential contact and cannot effectively remove adhering substances from hexagonal edges and flat surfaces, the hexagonal scraping nozzle achieves thorough scraping by adhering to the outer wall of the power pipe 7, resulting in more comprehensive and reliable protection. For those skilled in the art, the dustproof ring 14 is preferably connected to the limiting guide member via screws and used to snap-fit ​​and fix the dustproof scraper 13; other connection and fixing methods can also be used, which are not explicitly limited here.

[0034] refer to Figure 3 This embodiment also includes a bearing system installed inside the cylinder 1. The bearing system includes a main load bearing 9 and an auxiliary support bearing 10. The main load bearing 9 and the auxiliary support bearing 10 are located at the middle and far end of the rotating sleeve 3, respectively. The inner ring of the main load bearing 9 is interference-fitted with the lead screw 4, and the inner ring of the auxiliary support bearing 10 is clearance-fitted with the lead screw 4. The far end of the rotating sleeve 3 refers to the end of the rotating sleeve 3 that is away from the inner conical surface. Compared with the existing structure that relies on a single bearing for single-point support, this embodiment forms a span-type rigid support along the entire length of the lead screw 4 through the front and rear double-support point layout of the main load bearing 9 and the auxiliary support bearing 10. This greatly shortens the effective cantilever length of the lead screw 4 and improves the running stability and positioning accuracy stability under long-stroke heavy-load conditions.

[0035] As a further optimization, the bearing system also includes a positioning bearing assembly 11, located at the near end of the rotating sleeve 3. The positioning bearing assembly 11 further improves the operating accuracy of the rotating sleeve 3. The positioning bearing assembly 11 is located at the near end of the rotating sleeve 3, close to the inner conical surface. This position, adjacent to the conical mating pair, can apply radial positioning constraints to the rotating sleeve 3, thereby suppressing radial runout and axial wobble of the rotating sleeve 3 at the source of torque input. Simultaneously, the positioning bearing assembly 11 is located at the near end of the rotating sleeve 3, the main load-bearing bearing 9 is located in the middle of the rotating sleeve 3, and the auxiliary support bearing 10 is located at the far end of the rotating sleeve 3. These three are distributed in a three-stage arrangement along the axis of the lead screw 4, forming a full-section support system with near-end positioning constraints, middle heavy-load bearing, and far-end radial alignment, ensuring effective radial constraints on the rotating sleeve 3 throughout its entire length.

[0036] refer to Figure 4 In this embodiment, the cylinder body 1 is provided with a cooling structure in the mounting area corresponding to the stator 2. The cooling structure includes heat exchange channels 12 disposed inside the cylinder body 1 and evenly distributed along the circumference of the cylinder body 1. The heat exchange channels 12 are respectively provided with an inlet and an outlet, ensuring consistent heat dissipation conditions at all points along the circumference of the stator 2, effectively preventing local overheating of the stator 2, achieving uniformity of the motor's operating temperature field, and reducing the impact of uneven thermal expansion on the roundness and coaxiality of the cylinder body 1. For those skilled in the art, the heat exchange channels 12 can be U-shaped or spiral-shaped around the cylinder body 1; no specific limitation is made here.

[0037] It should be noted that, for those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention, and no reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A positive lead screw integrated electric cylinder, comprising a cylinder body, a stator and a rotor disposed within the cylinder body, characterized in that, include: Rotating sleeve, lead screw, and lock nut; The rotating sleeve is fixedly installed inside the rotor. The rotating sleeve has a central through hole for installing the lead screw, and the central through hole has an inner conical surface. The power input section of the lead screw has an outer conical surface that matches the inner conical surface. The lead screw passes through the rotating sleeve, and the outer conical surface fits against the inner conical surface. The end of the power input section is provided with a threaded section, and the locking nut cooperates with the threaded section to apply an axial preload to the end face of the rotating sleeve.

2. The integrated electric cylinder with a forward lead screw according to claim 1, characterized in that, The power input section is provided with a shoulder, which abuts against the rotating sleeve.

3. The integrated electric cylinder with a forward lead screw according to claim 2, characterized in that, The shoulder is provided with a positioning protrusion extending toward the rotating sleeve, and the rotating sleeve is provided with a positioning groove that adapts to the positioning protrusion, and the depth of the positioning groove is greater than the length of the positioning protrusion.

4. The integrated electric cylinder with a forward lead screw according to claim 3, characterized in that, It also includes locking bolts; The shoulder of the shaft has a positioning hole parallel to the lead screw, and the rotating sleeve has a threaded hole at the position corresponding to the positioning hole. The locking bolt passes through the positioning hole and engages with the threaded hole to apply an axial locking force to the rotating sleeve.

5. The integrated electric cylinder with a forward lead screw according to claim 1, characterized in that, The threaded section has a left-hand thread and a right-hand thread. There are two locking nuts, namely a fastening nut and a limiting nut. The fastening nut and the limiting nut respectively mate with the left-hand thread and the right-hand thread. The fastening nut abuts against the end face of the rotating sleeve, and the limiting nut abuts against the fastening nut.

6. The integrated electric cylinder with a forward lead screw according to claim 1, characterized in that, The outer surface of the power output section of the lead screw is provided with external threads; The cylinder body is provided with a power tube coaxially arranged with the lead screw. A transmission nut that mates with the external thread is installed in the power tube. The outer wall of the power tube is provided with a guide surface. The cylinder body is provided with a guide hole that matches the guide surface of the power tube. When the lead screw rotates, the power tube moves back and forth along the axial direction of the lead screw through the cooperation of the transmission nut and the guide hole.

7. The integrated electric cylinder with a forward lead screw according to claim 6, characterized in that, The guide surface consists of six guide planes disposed on the outer wall of the power pipe and evenly distributed along the circumference of the power pipe. A limiting guide is fixed inside the cylinder. The limiting guide has a regular hexagonal through hole. The power pipe passes through the regular hexagonal through hole and slides with it to constrain the circumferential rotation of the power pipe.

8. The integrated electric cylinder with a forward lead screw according to claim 1, characterized in that, Dustproof scrapers are respectively embedded at the end face of the limiting guide. The inner hole of the dustproof scraper is a hexagonal scraping opening that matches the outer contour of the power pipe, and the inner wall of the dustproof scraper is tightly fitted to the outer wall of the power pipe. The dustproof scraper is provided with a dustproof retaining ring on its outer side, which is used to press and fix the dustproof scraper.

9. The integrated electric cylinder with a forward lead screw according to claim 1, characterized in that, It also includes a bearing system installed in the cylinder body, the bearing system comprising a main load bearing and an auxiliary support bearing; The main bearing and the auxiliary support bearing are located at the middle and far ends of the rotating sleeve, respectively. The inner ring of the main bearing is interference-fitted with the lead screw, and the inner ring of the auxiliary support bearing is clearance-fitted with the lead screw.

10. The integrated electric cylinder with a forward lead screw according to claim 1, characterized in that, The cylinder body is provided with a cooling structure in the mounting area corresponding to the stator; the cooling structure includes heat exchange channels disposed in the cylinder body wall and evenly distributed along the circumference of the cylinder body; the two ends of the heat exchange channels are respectively provided with liquid inlet and liquid outlet.

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