Adjustable manual turning gear and using method thereof

Abstract

The invention discloses an adjustable manual turning gear and a using method thereof. The adjustable manual turning gear comprises a semicircular seat body, a movable claw clamp and a driving assembly. The two semicircular seat bodies are both semicircular ring-shaped, are coaxially butted and screwed to form a complete circular ring, and are coaxially sleeved on the half coupling at intervals; two square grooves matched with the movable claw clamps are sequentially and vertically embedded in the front face of each semicircular seat body in the circumferential direction of the semicircular seat body at intervals, and each square groove extends out of an inner arc face and an outer arc face corresponding to the corresponding semicircular seat body in the radial direction. Radial guide rails are embedded in the positions, corresponding to the two side faces of each square groove, of each semicircular seat body, and the radial guide rails are arranged on the front face sides close to the corresponding semicircular seat bodies and extend out of the inner arc faces and the outer arc faces corresponding to the semicircular seat bodies in the radial direction. The four movable claw clamps are installed in the corresponding square grooves in the radial direction and are in sliding connection with the corresponding radial guide rails through driving assemblies. According to the invention, the matching precision and long-term operation stability of the rotor system can be ensured.

Description

Technical Field

[0001] This invention relates to the field of centrifugal compressor installation and maintenance technology, specifically to an adjustable manual cranking device and its usage method. Background Technology

[0002] During the installation, inspection, and shutdown maintenance of centrifugal compressors, periodically rotating the rotor is an essential and critical procedure. Its purpose is to: 1) check whether there is any jamming or rubbing between the rotor and the stator; 2) prevent the shaft from bending and deforming due to long-term static gravity; and 3) provide conditions for subsequent procedures such as alignment.

[0003] Currently, for manual rotation operations of large centrifugal compressors, the following two methods are commonly used on site: 1) Pry bar insertion method: The operator uses a pry bar or special wrench to directly insert into the pin hole or bolt hole of the coupling and rotates the coupling by lever force; 2) Belt friction method: The belt is wrapped around the outer circle of the coupling, and the rotor is driven to rotate by the friction force generated by tension.

[0004] However, the aforementioned existing technologies have obvious limitations in actual operation: 1) They are prone to causing equipment damage: The contact between the pry bar and the metal hole wall is rigid and the contact stress is large, which can easily cause the edges of the coupling pin holes or bolt holes to be squeezed, scratched or rolled. This not only destroys the fitting accuracy of the coupling, but may also affect the original dynamic balance of the rotor; 2) Poor tool applicability: For pry bar insertion type, the pry bar wrench is usually of fixed size and can only be adapted to couplings with specific hole spacing; for compressors of different specifications, multiple sets of special tools are often required, which undoubtedly increases management costs; in addition, when the whole machine needs to be rotated, since all the pin holes and bolt holes of the coupling have been installed, it is impossible to use a pry bar to insert and rotate; 3) Low operational reliability: Friction type rotating is prone to slippage under heavy load conditions, and cannot provide stable rotating torque. At the same time, the slippage or even breakage of the friction belt poses a great risk of mechanical damage.

[0005] Therefore, how to develop an adjustable manual turning device to solve the problems of existing turning tools being prone to damaging couplings, having poor adaptability to couplings of different specifications, and being convenient and safe for on-site operation has become an urgent problem to be solved. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide an adjustable manual turning device and its usage method, which can avoid the use of metal tools to directly insert into the pin hole or bolt hole of the half coupling for rigid drive, thereby preventing irreversible mechanical damage such as scratches and extrusion deformation to the precision hole wall and outer surface of the half coupling, and ensuring the fitting accuracy and long-term operational stability of the rotor system.

[0007] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: An adjustable manual turning device of the present invention, the innovation of which is: comprising a semi-circular seat, a movable claw, and a drive assembly; both semi-circular seats are semi-circular rings, and are coaxially screwed together to form a complete ring, and are coaxially spaced and sleeved on a half-coupling; on the front surface of each semi-circular seat, two square grooves matching the movable claw are sequentially and vertically embedded at intervals along its circumference, and each square groove extends radially outward from the inner surface of the corresponding semi-circular seat. The outer arc surface does not extend beyond the opposite side of the corresponding semicircular seat; radial guide rails are also embedded on the two circumferential sides of each semicircular seat relative to each square slot, and each radial guide rail is located on the front side of the corresponding semicircular seat and extends radially beyond the inner and outer arc surfaces of the corresponding semicircular seat; the four movable claws are all elongated and are installed radially in the corresponding square slots, and are slidably connected to the corresponding radial guide rails through the drive assembly, thereby uniformly gripping the half coupling through the four movable claws.

[0008] Preferably, a first arc groove is coaxially embedded on the opposite side of one end face of each semicircular base along its arc direction. The thickness of each first arc groove is half the thickness of the corresponding semicircular base, and one side of each first arc groove extends out to the opposite side of the corresponding semicircular base. Its inner and outer arc surfaces respectively extend out to the corresponding inner and outer arc surfaces of the semicircular base. The first arc groove forms a splicing block I on the front side at one end of each semicircular base. A second arc groove is coaxially embedded on the opposite side of the other end face of each semicircular base along its arc direction. Each of the two second arc grooves is matched with the first arc groove, and the arc lengths of the two are consistent. The thickness of each second arc groove is half the thickness of the corresponding semi-circular seat, and one side of each second arc groove extends out of the front of the corresponding semi-circular seat. The inner and outer arc surfaces of each arc groove extend out of the corresponding inner and outer arc surfaces of the corresponding semi-circular seat. The second arc groove forms a splicing block II on the opposite side at the other end of each semi-circular seat. The two semi-circular seats are coaxially spliced ​​into a ring that matches the half coupling by aligning and fitting the splicing block I with the corresponding splicing block II. The front of the two semi-circular seats is located on the same side.

[0009] Preferably, it also includes connecting screws; on the front side of each of the splicing blocks I, several countersunk holes I that match the connecting screws are evenly spaced and vertically embedded, and the small diameter end of each of the countersunk holes I extends vertically to the back side of the corresponding splicing block I; on the back side of each of the splicing blocks II, several threaded holes that match the connecting screws are evenly spaced and vertically embedded and penetrated, and the opening position of each of the threaded holes corresponds to the opening position of each of the countersunk holes I. The two semi-circular seats that are coaxially spliced ​​together are screwed and fixed by the screwing engagement of the connecting screws, the countersunk holes I and the corresponding threaded holes.

[0010] Preferably, the opening position of each of the square slots should ensure that when the two semicircular seats are coaxially spliced ​​together, the included angle between adjacent square slots is 90°, thereby ensuring that the four movable claws evenly grip the half coupling.

[0011] Preferably, a circular groove is embedded in each of the semicircular bases relative to the bottom of each square groove, and the two ends of each circular groove extend radially to the inner and outer arc surfaces of the corresponding semicircular bases, and are respectively connected to the corresponding square grooves; the diameter of each circular groove matches the circumferential width of the corresponding square groove, and a rod hole is also embedded in each of the semicircular bases perpendicularly along the thickness direction relative to the middle section of each circular groove, and each rod hole is respectively connected to the corresponding circular groove, and respectively extends perpendicularly to the opposite side of the corresponding semicircular base.

[0012] Preferably, one end face of each movable claw extending from the inner arc surface of the corresponding semi-circular seat is its working surface, and a non-metallic pad with low hardness and high friction coefficient is also fixedly attached to its working surface. This non-metallic pad increases the contact surface of the movable claw while preventing damage to the half coupling. The thickness of each movable claw is less than the opening depth of the corresponding square groove, and dovetail grooves matching the radial guide rails are vertically embedded on its two circumferential sides relative to each radial guide rail position. Each dovetail groove extends vertically to the two radial end faces of the corresponding movable claw, and the cooperation between the dovetail grooves and the corresponding radial guide rails ensures the stability of the movable claw sliding adjustment along the radial direction of the semi-circular seat.

[0013] Preferably, the drive assembly includes a lead screw, a positioning rod, and a fixing screw; a matching lead screw is coaxially sleeved in each of the circular grooves, and the length of each lead screw matches the length of the corresponding circular groove; a semi-thread matching the lead screw is formed along the length direction on the surface of each movable claw that abuts against the corresponding lead screw, and each lead screw is threadedly connected to the semi-thread of the corresponding movable claw; a slot is coaxially embedded in the middle section of each lead screw relative to the rod hole position, and the middle section of the corresponding lead screw is a smooth rod through the slot; a transmission interface matching a wrench is coaxially embedded in the end face of each lead screw on the outer arc surface side of the semi-circular seat, and each positioning rod matches the corresponding rod hole, and a semi-circular clip matching the slot is integrally formed at one end of each positioning rod; one end of the semi-circular clip of each positioning rod is respectively connected to the slot of the corresponding lead screw through the corresponding rod hole, ensuring... The other end face of each positioning rod is coplanar with the opposite face of the corresponding semicircular seat. A wrench is used to rotate the corresponding lead screw through the transmission interface to drive the radial linear sliding of the corresponding movable claw. During this process, a positioning rod is used to prevent the lead screw from moving axially. On the opposite face of each semicircular seat, a countersunk hole II matching the fixing screw is vertically embedded. The small diameter end of each countersunk hole II is a threaded end and extends towards the inner arc surface of the corresponding semicircular seat. Each countersunk hole II is adjacent to the corresponding rod hole, and its large diameter end is connected to the corresponding rod hole. On the other end face of each positioning rod, a fixing groove is vertically embedded near the corresponding fixing hole. The fixing groove forms a step at the other end of the positioning rod. After the fixing screw is screwed into the corresponding countersunk hole II, the large diameter end of the fixing screw abuts against the corresponding fixing groove, thereby radially positioning the corresponding positioning rod to prevent it from sliding out of the semicircular seat.

[0014] Preferably, the semi-threads of each lead screw and each movable claw are trapezoidal threads with a thread angle of 30° and a thread helix angle of less than 3°, thereby ensuring the self-locking property of the movable claw after it is installed in place while meeting the thread strength requirements.

[0015] Preferably, on the front and back sides of each semicircular base, an arc-shaped de-weighting groove is coaxially and vertically embedded on both sides of each square slot. Each de-weighting groove on the front side is symmetrically arranged with each de-weighting groove on the back side, and does not interfere with the radial adjustment of each movable claw. The de-weighting grooves achieve the weight reduction of the entire turning device. On each semicircular base, several lifting holes are vertically embedded at intervals along the circumference relative to each de-weighting groove. On the outer circumferential surface of each semicircular base, pry holes matching the pry bar are vertically embedded radially between the corresponding two square slots.

[0016] The innovative aspect of this invention, which describes a method for using an adjustable manual turning device, lies in the inclusion of the following steps: Step 1: First, clean the oil stains on the outer surface of the half-coupling to be clamped to ensure the coefficient of friction; Step 2: Then, use a wrench to rotate the lead screw in the opposite direction through the transmission interface, so that the opening diameter of the four movable claws is greater than the outer diameter of the half coupling; Step 3: Then, attach the turning device to the preset clamping position of the half coupling and tighten the connecting screws; Step 4: Then rotate the lead screw alternately in a diagonal sequence in the forward direction, so that the working surfaces of the four movable claws contact the outer circular surface of the half coupling in turn; Step 5: Then continue to gradually increase the clamping force in a diagonal sequence until the movable claws evenly grip the half coupling, and be careful not to over-clamp; Step Six: Then insert the pry bar into the corresponding pry hole, and then rotate the rotor at a uniform and steady speed; Step 7: After completion, rotate the lead screw in the opposite direction to retract the four movable claws, and then remove the rotating gear device.

[0017] The beneficial effects of this invention are: (1) The present invention can avoid using metal tools to directly insert into the pin hole or bolt hole of the half coupling for rigid drive, thereby preventing irreversible mechanical damage such as scratches and extrusion deformation to the precision hole wall and outer surface of the half coupling, and ensuring the fitting accuracy and long-term operation stability of the rotor system. (2) Through simple mechanical adjustment, the same set of turning device can be clamped and fixed on the outer circle of half couplings of different diameters, thereby achieving the effect of one set of tools for multiple uses, solving the problem of poor adaptability of existing tools to half couplings of different specifications, and reducing tool management and manufacturing costs. (3) The clamping method of the present invention can eliminate slippage and optimize the force application structure so that the operator can rotate the machine smoothly at a safe distance, thereby reducing labor intensity and eliminating safety hazards; (4) The present invention provides a non-metallic pad with low hardness and high friction coefficient on the working surface of the movable claw, which can not only increase the contact surface of the movable claw, but also prevent the half coupling from being pinched. (5) The present invention facilitates the weight reduction of the entire rotating device by providing several weight-reducing grooves; (6) The movable claw clamp of the present invention uses trapezoidal threads for both the semi-thread and the lead screw, which not only meets the thread strength requirements, but also ensures the self-locking property of the movable claw clamp after it is installed in place. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of an adjustable manual turning device according to the present invention.

[0020] Figure 2 This is a schematic diagram showing the usage state of an adjustable manual turning device according to the present invention.

[0021] Figure 3 This is a schematic diagram of the structure of the semi-circular base of the present invention.

[0022] Figure 4 for Figure 2 A frontal partial sectional view.

[0023] Figure 5 for Figure 2 A partial tangential sectional view.

[0024] Among them, 1-half coupling; 2-semi-circular seat; 21-radial guide rail; 22-circular groove; 23-rod hole; 24-counterhead I; 25-threaded hole; 26-lifting hole; 27-pry hole; 28-weight removal groove; 3-movable claw; 31-dovetail groove; 32-semi-thread; 4-lead screw; 41-slot; 42-transmission interface; 5-positioning rod; 51-semi-circular clip; 52-fixing groove; 6-pry bar; 7-fixing screw. Detailed Implementation

[0025] The technical solution of the present invention will be clearly and completely described below through specific embodiments.

[0026] An adjustable manual turning device of the present invention includes a semi-circular base 2, a movable claw 3, and a drive assembly; as shown Figures 1-5As shown, both semicircular seats 2 are semicircular rings, and they are coaxially screwed together to form a complete ring, and are coaxially spaced and sleeved on the half coupling 1; on the front of each semicircular seat 2, two square slots matching the movable claw 3 are also vertically embedded at intervals along its circumference. Each square slot extends radially out of the inner and outer arc surfaces of the corresponding semicircular seat 2, and none of them extend out of the back of the corresponding semicircular seat 2; on the two circumferential sides of each semicircular seat 2, radial guide rails 21 are also embedded, and each radial guide rail 21 is set on the front side of the corresponding semicircular seat 2, and extends radially out of the inner and outer arc surfaces of the corresponding semicircular seat 2; the four movable claws 3 are all long strips, and are respectively installed radially in the corresponding square slots, and are slidably connected to the corresponding radial guide rails 21 through the drive assembly, so that the four movable claws 3 evenly grip the half coupling 1.

[0027] In this invention, a first arcuate groove is coaxially embedded in one end face of each semicircular base 2 on the opposite side along its arc direction, such as... Figures 1-3 As shown, the thickness of each first arc groove is half the thickness of the corresponding semicircular base 2, and one side of each first arc groove extends out of the opposite side of the corresponding semicircular base 2. Its inner and outer arc surfaces extend out of the corresponding inner and outer arc surfaces of the corresponding semicircular base 2, respectively. The first arc grooves form a splicing block I on the front side at one end of each semicircular base 2. On the other end face of each semicircular base 2, a second arc groove is coaxially embedded along its arc direction near the front side. Each second arc groove matches the corresponding first arc groove, ensuring that their arc lengths are consistent. The thickness of each second arc groove is half the thickness of the corresponding semi-circular seat 2, and one side of each groove extends out of the front of the corresponding semi-circular seat 2. The inner and outer arc surfaces of each groove extend out of the corresponding inner and outer arc surfaces of the corresponding semi-circular seat 2. The second arc groove forms a splicing block II on the opposite side at the other end of each semi-circular seat 2. The splicing block I and the corresponding splicing block II are aligned and fitted together so that the two semi-circular seats 2 are coaxially spliced ​​into a ring that matches the half coupling 1, and the front of the two semi-circular seats 2 are on the same side.

[0028] In this invention, several countersunk holes I24, matching the connecting screws, are evenly spaced and vertically embedded on the front side of each splicing block I, and the small-diameter end of each countersunk hole I24 extends vertically outward from the reverse side of the corresponding splicing block I; for example... Figures 1-3 As shown, several threaded holes 25 that match the connecting screws are evenly spaced and vertically embedded on the reverse side of each splicing block II. The opening position of each threaded hole 25 corresponds to the opening position of each countersunk hole I 24. The two semi-circular seats 2 that are spliced ​​together on the same axis are screwed and fixed by the screwing engagement of the connecting screws, the countersunk hole I 24 and the corresponding threaded holes 25.

[0029] The opening position of each square slot must ensure that when the two semicircular seats 2 are coaxially spliced ​​together, the included angle between adjacent square slots is 90°, thereby ensuring that the four movable claws 3 evenly grip the half coupling 1.

[0030] like Figures 1-5 As shown, a circular groove 22 is embedded in each semicircular base 2 relative to the bottom of each square groove, and the two ends of each circular groove 22 extend radially to the inner and outer arc surfaces of the corresponding semicircular base 2, and are connected to the corresponding square groove in the whole; the diameter of each circular groove 22 matches the circumferential width of the corresponding square groove, and a rod hole 23 is embedded perpendicularly in each semicircular base 2 relative to the middle section of each circular groove 22 along the thickness direction of the semicircular base 2, and each rod hole 23 is connected to the corresponding circular groove 22, and extends perpendicularly to the opposite side of the corresponding semicircular base 2.

[0031] like Figures 1-5 As shown, each movable claw 3 extends from one end face of the inner arc surface of the corresponding semi-circular seat 2, which is its working surface. A non-metallic pad with low hardness and high friction coefficient is also attached and fixed to its working surface. The non-metallic pad increases the contact surface of the movable claw 3 and prevents the half coupling 1 from being pinched. The thickness of each movable claw 3 is less than the opening depth of the corresponding square groove. On its two circumferential sides, dovetail grooves 31 that match the radial guide rails 21 are vertically embedded in the corresponding radial end faces of the movable claw 3. The cooperation between the dovetail grooves 31 and the corresponding radial guide rails 21 ensures the stability of the movable claw 3 in sliding adjustment along the radial direction of the semi-circular seat 2.

[0032] The drive assembly of this invention includes a lead screw 4, a positioning rod 5, and a fixing screw 7; as shown Figures 1-5As shown, a matching lead screw 4 is coaxially sleeved in each circular groove 22, and the length of each lead screw 4 matches the length of the corresponding circular groove 22; a semi-thread 32 matching the lead screw 4 is also formed along its length direction on the surface of each movable claw 3 near the corresponding lead screw 4, and each lead screw 4 is threadedly connected to the semi-thread 32 of the corresponding movable claw 3; a slot 41 is coaxially embedded in the middle section of each lead screw 4 at the position relative to the rod hole 23, and the middle section of the corresponding lead screw 4 is smooth through the slot 41; on the outer arc surface side of each lead screw 4 near the semi-circular seat 2 The end face is also coaxially embedded with a transmission interface 42 that matches the wrench, and each positioning rod 5 matches the corresponding rod hole 23, and a semi-circular clip 51 that matches the slot 41 is integrally formed at one end of each positioning rod 5; one end of the semi-circular clip 51 of each positioning rod 5 is respectively connected to the slot 41 of the corresponding lead screw 4 through the corresponding rod hole 23, and ensures that the other end face is respectively coplanar with the opposite side of the corresponding semi-circular seat 2. Then, the wrench is used to rotate the corresponding lead screw 4 through the transmission interface 42 to drive the radial linear sliding of the corresponding movable claw clip 3, and the positioning rod 5 is used to prevent the axial movement of the lead screw 4 during this process. like Figures 1-5 As shown, on the reverse side of each semicircular seat 2, a countersunk hole II matching the fixing screw 7 is vertically embedded in the position of each rod hole 23. The small diameter end of each countersunk hole II is a threaded end, and they all extend towards the inner arc surface of the corresponding semicircular seat 2. Each countersunk hole II is set next to the corresponding rod hole 23, and its large diameter end is connected to the corresponding rod hole 23. On the other end face of each positioning rod 5, a fixing groove 52 is vertically embedded in the side of the corresponding fixing hole. The fixing groove 52 forms a step at the other end of the corresponding positioning rod 5. After the fixing screw 7 is screwed into the corresponding countersunk hole II, the large diameter end of the fixing screw 7 abuts against the corresponding fixing groove 52, thereby radially positioning the corresponding positioning rod 5 to prevent the positioning rod 5 from sliding out of the semicircular seat 2.

[0033] Among them, the semi-thread 32 of each lead screw 4 and each movable claw 3 adopts a trapezoidal thread with a tooth profile angle of 30° and a thread helix angle of less than 3°, thus ensuring the self-locking property after the movable claw 3 is installed in place while meeting the thread strength requirements.

[0034] In this invention, on the front and back sides of each semi-circular base 2, respectively, an arc-shaped weight-reducing groove 28 is coaxially and perpendicularly embedded on both sides of the circumference of each square groove, such as... Figures 1-5As shown, each weight-removing groove 28 on the front side is symmetrically arranged with each weight-removing groove 28 on the back side, and does not interfere with the radial adjustment action of each movable claw 3. The weight-removing groove 28 is used to achieve the weight reduction of the entire turning device. On each semi-circular base 2, several lifting holes 26 are vertically embedded in the circumferential direction at intervals relative to each weight-removing groove 28. On the outer circumferential surface of each semi-circular base 2, pry holes 27 matching the pry bar 6 are vertically embedded in the radial direction between the two corresponding square slots.

[0035] A method of using the adjustable manual turning device of the present invention, such as... Figures 1-5 As shown, it includes the following steps: Step 1: First, clean the oil stains on the outer surface of the half-coupling 1 that needs to be clamped to ensure the coefficient of friction.

[0036] Step 2: Then, use a wrench to rotate the lead screw 4 in the opposite direction through the transmission interface 42, so that the opening diameter of the four movable claws 3 is greater than the outer diameter of the half coupling 1.

[0037] Step 3: Then, attach the turning device to the preset clamping position of the half coupling 1 and tighten the connecting screws.

[0038] Step 4: Then rotate the lead screw 4 alternately in a diagonal sequence so that the working surfaces of the four movable claws 3 contact the outer circular surface of the half coupling 1 in sequence.

[0039] Step 5: Then continue to gradually increase the clamping force in a diagonal sequence until the movable claw 3 evenly grips the half coupling 1, and be careful not to over-clamp.

[0040] Step 6: Then insert the pry bar 6 into the corresponding pry hole 27, and then rotate the rotor at a uniform and steady speed.

[0041] Step 7: After completion, rotate the lead screw 4 in the opposite direction to retract the four movable claws 3, and then remove the rotating gear device.

[0042] The beneficial effects of this invention are: (1) The present invention can avoid using metal tools to directly insert into the pin hole or bolt hole of the half coupling 1 for rigid drive, thereby preventing irreversible mechanical damage such as scratches and extrusion deformation to the precision hole wall and outer surface of the half coupling 1, and ensuring the fitting accuracy and long-term operation stability of the rotor system. (2) Through simple mechanical adjustment, the same set of turning device can be clamped and fixed on the outer circle of half coupling 1 with different diameters, thereby achieving the effect of one set of tools for multiple uses, solving the problem of poor adaptability of existing tools to half coupling 1 of different specifications, and reducing tool management and manufacturing costs. (3) The clamping method of the present invention can eliminate slippage and optimize the force application structure so that the operator can rotate the machine smoothly at a safe distance, thereby reducing labor intensity and eliminating safety hazards; (4) The present invention provides a non-metallic pad with low hardness and high friction coefficient on the working surface of the movable claw 3, which can not only increase the contact surface of the movable claw 3, but also prevent the half coupling 1 from being pinched. (5) The present invention facilitates the weight reduction of the entire rotating gear device by providing several weight-reducing grooves 28; (6) The semi-thread 32 of the movable claw 3 and the lead screw 4 of the present invention are both trapezoidal threads, which can not only meet the thread strength, but also ensure the self-locking property after the movable claw 3 is installed in place.

[0043] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the concept and scope of the present invention. Without departing from the design concept of the present invention, all modifications and improvements made by those skilled in the art to the technical solutions of the present invention should fall within the protection scope of the present invention. The technical content for which protection is sought in the present invention has been fully described in the technical requirements.

Claims

1. An adjustable manual turning device, characterized in that: The device includes a semi-circular base, movable claws, and a drive assembly. Both semi-circular bases are annular and coaxially screwed together to form a complete ring, and are coaxially spaced and fitted onto the half-coupling. On the front of each semi-circular base, two square slots matching the movable claws are sequentially and vertically embedded at intervals along its circumference. Each square slot extends radially outwards to correspond to the inner and outer arc surfaces of the semi-circular base, but does not extend outwards to the reverse side of the semi-circular base. Radial guide rails are embedded on both circumferential sides of each semi-circular base relative to each square slot. Each radial guide rail is located on the front side of the corresponding semi-circular base and extends radially outwards to correspond to the inner and outer arc surfaces of the semi-circular base. Four movable claws are elongated strips, each radially installed within its corresponding square slot, and slidably connected to the corresponding radial guide rails via the drive assembly, thereby evenly gripping the half-coupling through the four movable claws.

2. The adjustable manual turning device according to claim 1, characterized in that: On one end face of each semicircular base, a first arc groove is coaxially embedded along its arc direction on the opposite side. The thickness of each first arc groove is half the thickness of the corresponding semicircular base, and one side of each first arc groove extends to the opposite side of the corresponding semicircular base. Its inner and outer arc surfaces extend to the corresponding inner and outer arc surfaces of the corresponding semicircular base, and the first arc groove forms a splicing block I on the front side at one end of each semicircular base. On the other end face of each semicircular base, a second arc groove is coaxially embedded along its arc direction on the front side. Each second arc groove matches the corresponding first arc groove, and the arc lengths of the two are consistent. The thickness of each of the second arc grooves is half the thickness of the corresponding semi-circular seat, and one side of each of them extends out of the front of the corresponding semi-circular seat. The inner and outer arc surfaces of each of them extend out of the corresponding inner and outer arc surfaces of the corresponding semi-circular seat. The second arc grooves form a splicing block II on the opposite side at the other end of each semi-circular seat. By aligning and fitting the splicing block I with the corresponding splicing block II, the two semi-circular seats are coaxially spliced ​​into a ring that matches the semi-coupling, and the front of the two semi-circular seats is located on the same side.

3. The adjustable manual turning device according to claim 2, characterized in that: It also includes connecting screws; on the front side of each of the splicing blocks I, several countersunk holes I that match the connecting screws are evenly spaced and vertically embedded, and the small diameter end of each of the countersunk holes I extends vertically to the back side of the corresponding splicing block I; on the back side of each of the splicing blocks II, several threaded holes that match the connecting screws are evenly spaced and vertically embedded and penetrated, and the opening position of each of the threaded holes corresponds to the opening position of each of the countersunk holes I. The two semi-circular seats that are coaxially spliced ​​together are screwed and fixed by the screwing engagement of the connecting screws, the countersunk holes I and the corresponding threaded holes.

4. The adjustable manual turning device according to claim 1, characterized in that: The opening position of each of the square slots must ensure that when two semicircular seats are coaxially spliced ​​together, the included angle between adjacent square slots is 90°, thereby ensuring that the four movable claws evenly grip the half coupling.

5. The adjustable manual turning device according to claim 1, characterized in that: A circular groove is embedded in each of the semicircular bases relative to the bottom of each square groove, and the two ends of each circular groove extend radially to the inner and outer arc surfaces of the corresponding semicircular bases, and are connected to the corresponding square grooves in a whole; the diameter of each circular groove matches the circumferential width of the corresponding square groove, and a rod hole is embedded perpendicularly in each of the semicircular bases relative to the middle section of each circular groove, along the thickness direction of the semicircular base, and each rod hole is connected to the corresponding circular groove, and extends perpendicularly to the opposite side of the corresponding semicircular base.

6. An adjustable manual turning device according to claim 5, characterized in that: Each movable claw extends from one end face of the corresponding semi-circular seat's inner arc surface, which serves as its working surface. A low-hardness, high-friction coefficient non-metallic pad is also fixedly attached to its working surface. This non-metallic pad increases the contact area of ​​the movable claw while preventing damage to the half-coupling. The thickness of each movable claw is less than the opening depth of the corresponding square groove. Furthermore, dovetail grooves matching the radial guide rails are vertically embedded on both circumferential sides relative to each radial guide rail position. Each dovetail groove extends vertically to the corresponding radial end face of the movable claw. The cooperation between the dovetail grooves and the corresponding radial guide rails ensures the stability of the movable claw's sliding adjustment along the radial direction of the semi-circular seat.

7. An adjustable manual turning device according to claim 6, characterized in that: The drive assembly includes a lead screw, a positioning rod, and a fixing screw. A matching lead screw is coaxially sleeved within each of the circular grooves, and the length of each lead screw matches the length of the corresponding circular groove. A semi-thread matching the lead screw is formed along the length of the surface of each movable claw abutting the corresponding lead screw, and each lead screw is threadedly connected to the semi-thread of the corresponding movable claw. A slot is coaxially embedded in the middle section of each lead screw relative to the rod hole, making the middle section of the lead screw a smooth rod. A transmission interface matching a wrench is coaxially embedded in the end face of each lead screw on the outer arc surface of the semi-circular seat. Each positioning rod matches the corresponding rod hole, and a semi-circular clip matching the slot is integrally formed at one end of each positioning rod. One end of the semi-circular clip of each positioning rod is connected to the slot of the corresponding lead screw via the corresponding rod hole, ensuring that its other... One end face is coplanar with the opposite face of the corresponding semicircular seat. A wrench is used to rotate the corresponding lead screw through the transmission interface to drive the radial linear sliding of the corresponding movable claw. During this process, a positioning rod is used to prevent the lead screw from moving axially. On the opposite face of each semicircular seat, a countersunk hole II matching the fixing screw is vertically embedded. The small diameter end of each countersunk hole II is a threaded end and extends towards the inner arc surface of the corresponding semicircular seat. Each countersunk hole II is adjacent to the corresponding rod hole, and its large diameter end is connected to the corresponding rod hole. On the other end face of each positioning rod, a fixing groove is vertically embedded near the fixing hole. The fixing groove forms a step at the other end of the positioning rod. After the fixing screw is screwed into the corresponding countersunk hole II, the large diameter end of the fixing screw abuts against the corresponding fixing groove, thereby radially positioning the corresponding positioning rod to prevent it from sliding out of the semicircular seat.

8. An adjustable manual turning device according to claim 7, characterized in that: Each lead screw and each movable claw clamp have a trapezoidal thread with a thread angle of 30° and a thread helix angle of less than 3°, thus ensuring the self-locking property of the movable claw clamp after it is installed in place while meeting the thread strength requirements.

9. An adjustable manual turning device according to claim 7, characterized in that: On the front and back sides of each semicircular base, arc-shaped de-weighting grooves are coaxially and vertically embedded on both sides of each square slot. Each de-weighting groove on the front side is symmetrically arranged with each de-weighting groove on the back side, and does not interfere with the radial adjustment of each movable claw. The de-weighting grooves also achieve the weight reduction of the entire turning device. On each semicircular base, several lifting holes are vertically embedded at intervals along the circumference relative to each de-weighting groove. Furthermore, on the outer circumferential surface of each semicircular base, pry holes matching the pry bar are vertically embedded radially between the corresponding two square slots.

10. A method of using an adjustable manual turning device according to any one of claims 1 to 9, characterized in that... Includes the following steps: Step 1: First, clean the oil stains on the outer surface of the half-coupling to be clamped to ensure the coefficient of friction; Step 2: Then, use a wrench to rotate the lead screw in the opposite direction through the transmission interface, so that the opening diameter of the four movable claws is greater than the outer diameter of the half coupling; Step 3: Then, attach the turning device to the preset clamping position of the half coupling and tighten the connecting screws; Step 4: Then rotate the lead screw alternately in a diagonal sequence in the forward direction, so that the working surfaces of the four movable claws contact the outer circular surface of the half coupling in turn; Step 5: Then continue to gradually increase the clamping force in a diagonal sequence until the movable claws evenly grip the half coupling, and be careful not to over-clamp; Step Six: Then insert the pry bar into the corresponding pry hole, and then rotate the rotor at a uniform and steady speed; Step 7: After completion, rotate the lead screw in the opposite direction to retract the four movable claws, and then remove the rotating gear device.

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