Fully automatic hydraulic step feed device

Abstract

The utility model discloses a full -automatic hydraulic pressure step -feed equipment, including drive mechanism, including a plurality of rotating electrical machines, rotating electrical machine drive screw rod autorotation, guide mechanism, including a plurality of mutually parallel arrangement's screw rod, and screw rod at least has two moving plate, chuck, each moving plate all are fixed with mutually coaxial arrangement's chuck, and the chuck has the passage hole that can hold or release to axle rod spare, wherein, moving plate and screw rod all are movable assembly, and the outer wall of screw rod includes outer thread section and light axle section, and adjacent two moving plates are movable assembly with same screw rod through a screw nut and a linear bearing respectively, and different chuck alternately holds and releases to axle rod spare and alternately axial motion, and the feed inlet of the chuck in upstream has a plurality of round table cavities, and the feed inlet of the chuck in downstream has a round table cavity. Adopt the utility model guide accurate, prevent skew, adapt to the characteristic of long axle rod spare.

Description

Technical Field

[0001] This utility model relates to the field of automated feeding equipment, specifically to a fully automatic hydraulic stepping feeding device. Background Technology

[0002] In the field of automation, conveyor belts are a common type of feeding mechanism. Conveyor belts can transport most workpieces. However, they are sometimes inadequate for handling shafts and rods because these components have a relatively long axial dimension and are prone to rolling and skewing. Automated feeding mechanisms for shafts and rods require specific design considerations. Utility Model Content

[0003] The problem to be solved by this utility model is to provide a fully automatic hydraulic stepping feeding device.

[0004] To solve the above problems, this utility model provides a fully automatic hydraulic stepping feeding device. To achieve the above objectives, the technical solution adopted by this utility model to solve its technical problems is as follows: A fully automatic hydraulic stepping feeding device includes: a drive mechanism comprising several rotary motors, each rotary motor driving a lead screw to rotate; a guide mechanism comprising several lead screws arranged parallel to each other, each lead screw passing through at least two moving plates; and chucks, each moving plate having a chuck arranged coaxially, each chuck having a channel hole for clamping or releasing shaft members; wherein each moving plate is movably assembled with all lead screws, the outer wall of each lead screw includes an external thread section and a smooth shaft section, each moving plate is movably assembled with the external thread section via a nut, and the moving plate is movably assembled with the smooth shaft section via a linear bearing; each moving plate is fixed with several nuts and several linear bearings; two adjacent moving plates are movably assembled with the same lead screw via a nut and a linear bearing, respectively; different chucks alternately clamp and release shaft members and alternately move axially; the feed inlet of the upstream chuck has several frustum-shaped cavities, and the feed inlet of the downstream chuck has one frustum-shaped cavity.

[0005] As a further improvement of this utility model, the moving plate includes an upper moving plate and a lower moving plate that are parallel to each other, and the chuck includes an upper hydraulic chuck and a lower hydraulic chuck that are fixed to the upper moving plate and the lower moving plate, respectively; the upper hydraulic chuck has an inlet pipe through which the shaft rod passes, and along the conveying direction of the shaft rod, the inlet pipe sequentially includes a first frustum cavity, a second frustum cavity, and a first cylindrical cavity; along the conveying direction of the shaft rod, the inner diameter of the first frustum cavity to the second frustum cavity gradually decreases; the cone angle of the first frustum cavity is greater than the cone angle of the second frustum cavity.

[0006] As a further improvement of this utility model, the lower hydraulic chuck has an outlet pipe through which the shaft rod passes. Along the conveying direction of the shaft rod, the outlet pipe sequentially includes a third frustum cavity and a second cylindrical cavity; the inner diameter of the first cylindrical cavity is equal to the inner diameter of the second cylindrical cavity; the cone angle of the third frustum cavity is less than the cone angle of the second frustum cavity.

[0007] As a further improvement of this utility model, the upper hydraulic chuck is fixed to the side of the upper moving plate facing the lower moving plate, and the lower hydraulic chuck is fixed to the side of the lower moving plate away from the upper moving plate; a lower flange is also fixed to the side of the lower moving plate facing the upper moving plate, the upper flange is fixed to the shaft end of the upper hydraulic chuck, and a plurality of guide posts extending in the direction of the upper hydraulic chuck are fixed to the lower flange, the guide posts pass through the upper flange, and the upper flange has a guide sleeve that is movably assembled with the guide posts.

[0008] As a further improvement of this utility model, a number of guide posts are arranged in a circular array, and the number of guide posts is greater than the sum of the number of lead screws; an upper flange ring is fixed to the top of all guide posts, and the upper flange is located between the upper flange ring and the lower flange.

[0009] As a further improvement of this utility model, the lower surface of the upper flange has a lower boss, and the upper surface of the lower flange has an upper boss; an outlet pipe extends integrally along the axis of the lower hydraulic chuck, through which a shaft member passes; and a circular hole is provided at the axis of the upper flange, through which a shaft member passes.

[0010] As a further improvement of this utility model, the lead screw has four parts, including two first lead screws and two second lead screws. The two first lead screws are located diagonally opposite each other on the same moving plate, and the two second lead screws are also located diagonally opposite each other on the same moving plate. The lead screw nut includes a first lead screw nut and a second lead screw nut. The linear bearing includes a first linear bearing and a second linear bearing. The first lead screw is assembled with the upper moving plate through the first lead screw nut. The second lead screw is assembled with the upper moving plate through the first linear bearing. The first lead screw is assembled with the lower moving plate through the second linear bearing. The second lead screw is assembled with the lower moving plate through the second lead screw nut.

[0011] As a further improvement of this utility model, the length of the external thread section of the lead screw is less than the length of the optical axis section; the cross-sectional profile of any point on the optical axis section is a circle with an equal diameter; the diameter of the optical axis section is equal to the diameter corresponding to the thread crest circle of the external thread section.

[0012] As a further improvement of this utility model, a driven gear is coaxially fixed at the same end of the lead screw, and the rotary motor meshes with the driven gear through a driving gear; the number of rotary motors is four, the diameter of the driving gear is smaller than the diameter of the driven gear, and both the driving gear and the driven gear are helical gears.

[0013] As a further improvement of this utility model, the rotary motor is fixed with a frame, and the driving gear and driven gear are located outside the frame.

[0014] The beneficial technical effects of using the fully automatic hydraulic stepping feeding equipment of this application are: By cooperating with the lead screw external thread section and the lead screw nut, the optical shaft section and the linear bearing, and the movable assembly design of each moving plate and all lead screws, the moving plate is ensured to be accurately guided and evenly stressed during axial movement, effectively avoiding skew and deviation, and improving the stability of the feeding action.

[0015] Different chucks alternately clamp and release the shaft components and move them axially in a synchronous alternating manner, realizing continuous and uninterrupted feeding of the shaft components. This can adapt to the characteristics of the shaft components, such as long axial dimensions and easy rolling, and solve the adaptation problem of traditional feeding methods.

[0016] The multiple frustum cavities of the upstream chuck feed inlet cooperate with the single frustum cavity of the downstream chuck to form a stepped guide and centering structure, which can effectively correct and guide the shaft members, ensure coaxiality during clamping, avoid damage to the shaft members during transmission, and adapt to the feeding requirements of slender shaft members. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a perspective view of one embodiment of the present utility model; Figure 2 This is a perspective view of one embodiment of the present utility model; Figure 3 This is a perspective view of one embodiment of the present utility model; Figure 4 This is a perspective view of one embodiment of the present utility model; Figure 5 This is a top view of one embodiment of the present invention; Figure 6 This is a cross-sectional view (AA) of one embodiment of this utility model.

[0019] 1-Rotary motor; 2-Driving gear; 3-Driven gear; 5-Upper moving plate; 501-Notch; 6-Lower moving plate; 8-Frame; 801-Hollow hole; 9-First lead screw nut; 10-First linear bearing; 11-Second lead screw nut; 12-Second linear bearing; 13-First lead screw; 14-Second lead screw; 15-Upper hydraulic chuck; 16-Lower hydraulic chuck; 17-Upper flange; 1701-Lower boss ; 1702-Circular hole; 18-Lower flange; 1801-Upper boss; 19-Guide post; 20-Guide sleeve; 21-Inlet pipe; 2101-First frustum cavity; 2102-Second frustum cavity; 2103-First cylindrical cavity; 22-Outlet pipe; 2201-Third frustum cavity; 2202-Second cylindrical cavity; 23-Upper flange ring; 24-Lifting lug; 25-Tap roller bearing; 26-Radial cut. Detailed Implementation

[0020] The present invention will be further described in detail below with reference to specific embodiments: To achieve the purpose of this utility model, please refer to Figures 1 to 6 A fully automatic hydraulic stepping feeding device includes: a drive mechanism comprising several rotary motors 1, each rotary motor 1 driving a lead screw to rotate; a guide mechanism comprising several lead screws arranged parallel to each other, each lead screw passing through at least two moving plates; and chucks, each moving plate having a chuck arranged coaxially, the chucks having channels for clamping or releasing shaft members. Each moving plate is movably assembled with all lead screws, the outer wall of the lead screw including an external thread section and a smooth shaft section. The moving plate is movably assembled with the external thread section via a nut, and with the smooth shaft section via a linear bearing. Each moving plate is fixed with several nuts and several linear bearings. Two adjacent moving plates are movably assembled with the same lead screw via a nut and a linear bearing, respectively. Different chucks alternately clamp and release shaft members and alternately move axially. The feed inlet of the upstream chuck has several frustum-shaped cavities, and the feed inlet of the downstream chuck has one frustum-shaped cavity.

[0021] To clearly demonstrate the internal structural principles, from Figures 1 to 4 The fully automatic hydraulic stepping feeding device of this application has undergone a process of gradually hiding external components.

[0022] Figure 5 At the same time Figure 4 A top view based on the base.

[0023] The beneficial effects of adopting the above technical solution are: This equipment is a special feeding device with a precise design and a high level of automation. It can be used to achieve continuous, stable and uninterrupted automatic feeding of slender cylindrical materials such as magnesium rods and aluminum rods with a diameter of about 10mm.

[0024] The equipment features a compact overall structure and a scientifically sound layout. Its core actuator consists of two sets of hydraulic chucks arranged side by side, each equipped with a servo motor as the drive component. These two identical clamping and feeding functional units work together through a collaborative control mechanism to continuously feed materials.

[0025] The hydraulic chuck is responsible for clamping the material, and the servo motor is used to drive the chuck's back-and-forth movement. One hydraulic chuck is controlled by two synchronously running servo motors.

[0026] The upstream and downstream chucks have different shapes for their internal channel holes. Both have stepped deformation channel holes, with the upstream chuck having a relatively larger cone angle and the downstream chuck having a relatively smaller cone angle.

[0027] In some other embodiments of this utility model, the movable plate includes an upper movable plate 5 and a lower movable plate 6 that are parallel to each other, and the chuck includes an upper hydraulic chuck 15 and a lower hydraulic chuck 16 that are respectively fixed to the upper movable plate 5 and the lower movable plate 6. The upper hydraulic chuck 15 has an inlet pipe 21 through which the shaft rod passes. Along the conveying direction of the shaft rod, the inlet pipe 21 sequentially includes a first frustum cavity 2101, a second frustum cavity 2102, and a first cylindrical cavity 2103. Along the conveying direction of the shaft rod, the inner diameter of the first frustum cavity 2101 to the second frustum cavity 2102 gradually decreases. The taper angle of the first frustum cavity 2101 is greater than the taper angle of the second frustum cavity 2102.

[0028] The beneficial effects of adopting the above technical solution are as follows: the inlet pipe 21 of the upper hydraulic chuck 15 adopts a stepped structure of a first frustum cavity 2101 and a second frustum cavity 2102. The first frustum cavity 2101 has a larger cone angle, which facilitates the rapid guidance of the shaft member into the chamber. The second frustum cavity 2102 has a smaller cone angle, which enables precise centering and ensures that the shaft member maintains coaxiality during transmission, thereby reducing jamming and wear.

[0029] In some other embodiments of this utility model, the lower hydraulic chuck 16 has an outlet pipe 22 through which a shaft member passes. Along the conveying direction of the shaft member, the outlet pipe 22 sequentially includes a third frustum cavity 2201 and a second cylindrical cavity 2202. The inner diameter of the first cylindrical cavity 2103 is equal to the inner diameter of the second cylindrical cavity 2202. The taper angle of the third frustum cavity 2201 is smaller than the taper angle of the second frustum cavity 2102.

[0030] The beneficial effects of adopting the above technical solution are: the outlet pipe 22 of the lower hydraulic chuck 16 is provided with a third frustum cavity 2201 and a second cylindrical cavity 2202. The third frustum cavity 2201 has a smaller cone angle to provide a smooth transition. The inner diameter of the second cylindrical cavity 2202 is the same as that of the first cylindrical cavity 2103, which ensures the continuity and stability of the shaft member during transmission and avoids end shaking or damage.

[0031] In some other embodiments of this utility model, the upper hydraulic chuck 15 is fixed to the side of the upper moving plate 5 facing the lower moving plate 6, and the lower hydraulic chuck 16 is fixed to the side of the lower moving plate 6 away from the upper moving plate 5. A lower flange 18 is also fixed to the side of the lower moving plate 6 facing the upper moving plate 5, and an upper flange 17 is fixed to the shaft end of the upper hydraulic chuck 15. A plurality of guide posts 19 extending in the direction of the upper hydraulic chuck 15 are fixed to the lower flange 18, and the guide posts 19 pass through the upper flange 17. The upper flange 17 has guide sleeves 20 that are movably assembled with the guide posts 19.

[0032] The beneficial effects of adopting the above technical solution are: the upper flange 17, lower flange 18, guide post 19, and guide sleeve 20 are equivalent to providing another set of linear guiding mechanisms, which strengthens the anti-skewness capability of the entire radial direction, ensures the stability against loosening, and ensures the coaxiality of the two hydraulic chucks, thereby ensuring the smoothness of axial feeding.

[0033] In some other embodiments of this invention, a plurality of guide posts 19 are arranged in a circular array, and the number of guide posts 19 is greater than the sum of the number of lead screws. A common upper flange ring 23 is fixed to the top of all guide posts 19, and an upper flange 17 is located between the upper flange ring 23 and the lower flange ring 18.

[0034] The beneficial effects of adopting the above technical solution are: the guide posts 19 are arranged in a ring array and their number is significantly greater than that of the lead screw. All the guide posts 19 are fixed with the flange ring 23 at the top, forming a uniformly distributed guide support, which further enhances the stability of the moving plate movement and prevents skewing and vibration.

[0035] In some other embodiments of this utility model, the lower surface of the upper flange 17 has a lower boss 1701, and the upper surface of the lower flange 18 has an upper boss 1801. An outlet pipe 22 extends integrally along the axis of the lower hydraulic chuck 16, through which a shaft member passes. A circular hole 1702 is provided at the axis of the upper flange 17, through which a shaft member passes.

[0036] The beneficial effects of adopting the above technical solution are: the upper flange 17 is provided with a lower boss 1701 and the lower flange 18 is provided with an upper boss 1801, which provides precise positioning and contact support; the outlet pipe 22 and the circular hole 1702 ensure good alignment when the shaft passes through, thereby improving the structural rigidity and reliability of the equipment.

[0037] In some other embodiments of this utility model, there are four lead screws, including two first lead screws 13 and two second lead screws 14. The two first lead screws 13 are located diagonally opposite each other on the same movable plate, and the two second lead screws 14 are also located diagonally opposite each other on the same movable plate. The lead screw nuts include a first lead screw nut 9 and a second lead screw nut 11. The linear bearings include a first linear bearing 10 and a second linear bearing 12. The first lead screw 13 is assembled to the upper movable plate 5 via the first lead screw nut 9. The second lead screw 14 is assembled to the upper movable plate 5 via the first linear bearing 10. The first lead screw 13 is assembled to the lower movable plate 6 via the second linear bearing 12. The second lead screw 14 is assembled to the lower movable plate 6 via the second lead screw nut 11.

[0038] The beneficial effects of adopting the above technical solution are: there are two types of four lead screws, and each of the four lead screws is arranged at one of the four corners. In this way, the arrangement of the lead screw nut and the linear bearing of the moving plate is more symmetrical, the force is more even, and the moving plate is less likely to tilt when it moves.

[0039] In some other embodiments of this invention, the length of the external thread section of the lead screw is less than the length of the smooth shaft section. The cross-sectional profile of the smooth shaft section at any point is a circle with an equal diameter. The diameter of the smooth shaft section is equal to the diameter corresponding to the thread crest circle of the external thread section.

[0040] Because the lines of the external thread section are very dense in the attached drawing, therefore... Figure 2 As shown in the figure, the thread shape of the external thread section is not shown, but the dividing line between the external thread section and the smooth axis section is clearly shown.

[0041] The beneficial effects of adopting the above technical solution are: in order to save actual processing costs, the entire lead screw can be processed from a cylindrical steel billet, with recessed thread grooves machined locally, thereby forming relatively convex thread teeth.

[0042] like Figure 1 As shown, in some other embodiments of this utility model, a driven gear 3 is coaxially fixed at the same end of the lead screw, and the rotary motor 1 meshes with the driven gear 3 through the driving gear 2. There are four rotary motors 1, the diameter of the driving gear 2 is smaller than the diameter of the driven gear 3, and both the driving gear 2 and the driven gear 3 are helical gears.

[0043] The beneficial effects of adopting the above technical solution are: the driving gear and the driven gear transmit rotational force, the relatively large driven gear can amplify the rotational torque of the lead screw, and the helical gear ensures the stability of force transmission.

[0044] In some other embodiments of this utility model, the rotary motor 1 is fixed with a frame 8. The driving gear 2 and the driven gear 3 are located outside the frame 8.

[0045] The beneficial effect of adopting the above technical solution is that the frame plays a role in wrapping and protecting the lead screw and chuck.

[0046] In one embodiment, such as Figure 1 As shown, the side walls of the frame 8 have several openwork holes 801. In addition, the top of the frame 8 has several hanging lugs 24.

[0047] In one embodiment, such as Figure 2 As shown, the upper movable plate 5 has a recessed notch 501 on its edge, which is used to avoid the rotary motor 1.

[0048] To facilitate the representation of the internal structure Figure 2 compared to Figure 1 , Figure 2 Frame 8 is hidden.

[0049] In one embodiment, such as Figure 6 As shown, the outlet section of the upper hydraulic chuck 15 and the outlet end of the lower hydraulic chuck 16 have a ring array of several radial cutting slits 26. The radial cutting slits 26 weaken the structural strength at this point, making it easier for the outlet section of the upper hydraulic chuck 15 and the outlet end of the lower hydraulic chuck 16 to expand slightly radially outward.

[0050] In one embodiment, such as Figure 6 As shown, both the upper hydraulic chuck 15 and the lower hydraulic chuck 16 are fitted with tapered roller bearings 25.

[0051] The operating flow of the fully automatic hydraulic stepping feeding device in this application is as follows: Step S1: Initial state, the upper hydraulic chuck 15 clamps the material, i.e. the shaft member, and the lower hydraulic chuck 16 releases it.

[0052] Step S2: First feeding step, the upper hydraulic chuck 15, driven by its servo motor, i.e., rotary motor 1, carries the material forward precisely by a set distance.

[0053] Step S3: Handover preparation. When the upper hydraulic chuck 15 is about to move to the set point, the lower hydraulic chuck 16 clamps the material and moves simultaneously with the upper hydraulic chuck 15.

[0054] Step S4: Power switching. After the upper hydraulic chuck 15 moves to the set position, the upper hydraulic chuck 15 releases the material, completing the seamless transfer of power.

[0055] Step S5: Second feeding step. After the lower hydraulic chuck 16 clamps the material, continue to push the material forward to ensure the continuity of material conveying.

[0056] Step S6: Reset and Cycle. While the lower hydraulic chuck 16 performs the feeding action, the upper hydraulic chuck 15, having completed its task, quickly returns to its initial position under the drive of its servo motor, ready for the next cycle. After the lower hydraulic chuck 16 reaches its position, the system switches back to the state where the upper hydraulic chuck 15 clamps, follows, and the lower hydraulic chuck 16 releases, repeating the above steps in a continuous cycle to achieve continuous material movement.

[0057] The above embodiments are only for illustrating the technical concept and features of this utility model. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it. They should not be used to limit the protection scope of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be covered within the protection scope of this utility model.

Claims

1. A fully automatic hydraulic step feed device, characterized in that, include: The drive mechanism includes several rotary motors, each of which drives a lead screw to rotate. The guiding mechanism includes several lead screws arranged in parallel to each other, and each lead screw passes through at least two moving plates; The chuck is fixed to each movable plate and is arranged coaxially with each other. The chuck has a channel hole that can clamp or release the shaft member. The movable plate is movably assembled with a lead screw passing through it. The outer wall of the lead screw includes an external thread section and a smooth shaft section. The movable plate is movably assembled with the external thread section via a nut and with the smooth shaft section via a linear bearing. Each movable plate is fixed with several nuts and several linear bearings; Two adjacent movable plates are respectively connected to the same lead screw via a lead screw nut and a linear bearing; Different chucks alternately clamp and release the shaft members and alternately move them axially. The feed inlet of the upstream chuck has several frustum-shaped cavities, while the feed inlet of the downstream chuck has one frustum-shaped cavity.

2. The fully automatic hydraulic step-feeding apparatus according to claim 1, characterized in that: The movable plate includes an upper movable plate and a lower movable plate that are parallel to each other, and the chuck includes an upper hydraulic chuck and a lower hydraulic chuck that are respectively fixed to the upper movable plate and the lower movable plate; The upper hydraulic chuck has an inlet pipe through which the shaft rod passes. Along the conveying direction of the shaft rod, the inlet pipe sequentially includes a first frustum cavity, a second frustum cavity, and a first cylindrical cavity. Along the conveying direction of the shaft member, the inner diameter of the first frustum cavity gradually decreases from the second frustum cavity; The cone angle of the first frustum cavity is greater than that of the second frustum cavity.

3. The fully automatic hydraulic step-feeding apparatus according to claim 2, characterized in that: The lower hydraulic chuck has an outlet pipe through which the shaft rod passes. Along the conveying direction of the shaft rod, the outlet pipe sequentially includes a third frustum cavity and a second cylindrical cavity. The inner diameter of the first cylindrical cavity is equal to the inner diameter of the second cylindrical cavity; The cone angle of the third frustum cavity is smaller than that of the second frustum cavity.

4. The fully automatic hydraulic step-feeding apparatus according to claim 2, characterized by: The upper hydraulic chuck is fixed to the side of the upper moving plate facing the lower moving plate, and the lower hydraulic chuck is fixed to the side of the lower moving plate away from the upper moving plate. A lower flange is fixed to the side of the lower moving plate facing the upper moving plate. An upper flange is fixed to the shaft end of the upper hydraulic chuck. Several guide pillars extending towards the upper hydraulic chuck are fixed to the lower flange. The guide pillars pass through the upper flange. The upper flange has guide sleeves that are movably assembled with the guide pillars.

5. The fully automatic hydraulic step-feeding apparatus according to claim 4, characterized in that: A number of guide posts are arranged in a circular array, and the number of guide posts is greater than the sum of the number of lead screws; All guide pillars are fixed to a common upper flange ring at their top, with the upper flange located between the upper flange ring and the lower flange.

6. The fully automatic hydraulic step-feeding apparatus according to claim 4, characterized by: The lower surface of the upper flange has a lower boss, and the upper surface of the lower flange has an upper boss; An outlet pipe extends integrally along the axial direction at the axis of the lower hydraulic chuck, through which the shaft member passes. The upper flange has a circular hole at its axis, through which the shaft member passes.

7. The fully automatic hydraulic inching device as claimed in claim 1, wherein: There are four lead screws in total, including two first lead screws and two second lead screws. The two first lead screws are located at opposite corners of the same moving plate, and the two second lead screws are also located at opposite corners of the same moving plate. The nut includes a first nut and a second nut; the linear bearing includes a first linear bearing and a second linear bearing. The first lead screw is assembled to the upper moving plate via a first lead nut; the second lead screw is assembled to the upper moving plate via a first linear bearing. The first lead screw is assembled with the lower moving plate via the second linear bearing; the second lead screw is assembled with the lower moving plate via the second lead nut.

8. The fully automatic hydraulic inching device of claim 1, wherein: The length of the external thread section of the lead screw is less than the length of the optical shaft section; The cross-sectional profile at any point along the optical axis is a circle with an equal diameter; The diameter of the optical axis segment is equal to the diameter of the thread crest circle of the external thread segment.

9. The fully automatic hydraulic inching device of claim 1, wherein: A driven gear is coaxially fixed at the same end of the lead screw, and the rotary motor meshes with the driven gear through a driving gear; The number of rotary motors is four, the diameter of the driving gear is smaller than the diameter of the driven gear, and both the driving gear and the driven gear are helical gears.

10. The fully automatic hydraulic step-feeding apparatus according to claim 9, characterized in that: The rotary motor is fixed to a frame, and the driving gear and driven gear are located outside the frame.

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