A rotatable positioning pallet compatible with crankshaft conveyors for various types of marine engines

Abstract

This invention proposes a rotatable positioning pallet for conveying crankshafts compatible with various types of marine machinery, relating to the field of crankshaft clamping and conveying technology. It solves the problem of traditional pallets using journals and bevels for positioning, which require nozzles to cover all surfaces of the workpiece during crankshaft cleaning, resulting in an excessive number of nozzles and difficulties in circumferential nozzle arrangement. It includes a bottom frame, a first clamping mechanism, a second clamping mechanism, and a counterweight box. The first and second clamping mechanisms are respectively located at opposite ends of the top surface of the bottom frame. The first clamping mechanism includes a fixed center and a positioning pin. The fixed center can rotate or be fixed relative to the bottom frame around an axis, while the positioning pin can move or be fixed axially relative to the fixed center. The second clamping mechanism includes a movable center, which can move or be fixed axially relative to the bottom frame. It is mainly used for conveying and cleaning crankshafts of various types of marine machinery.

Description

Technical Field

[0001] This invention relates to the field of crankshaft clamping and conveying technology, and in particular to a rotatable positioning pallet for conveying crankshafts compatible with various types of marine engines. Background Technology

[0002] Existing crankshaft cleaning trays primarily support the crankshaft diameter, using bevels for positioning. The entire workpiece is circumferentially fixed and cannot rotate. When cleaning crankshafts, nozzles need to cover all surfaces of the workpiece, resulting in an excessive number of nozzles. Furthermore, the irregular structure of the crankshaft makes circumferential nozzle placement difficult. This design is sufficient for cleaning small crankshafts around 1 meter in length, but when cleaning heavy-duty marine engine crankshafts ranging from 2 to 4.5 meters in length, the sheer size of the crankshaft makes complete coverage difficult when it is not rotating.

[0003] Meanwhile, because the support position is on the shaft diameter and the positioning position is on the bend during traditional cleaning, there will be relative sliding force between the workpiece and the support and positioning mechanism during the conveying and cleaning process, which will cause white marks on the workpiece processing surface, scratches are easy to occur at the support and positioning positions, and there are blind spots for cleaning at the support position. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a rotatable positioning tray compatible with conveying crankshafts from various marine engines. Utilizing the center holes and locating pin holes on both sides, used during crankshaft machining, the crankshaft is positioned axially and circumferentially. This positioning avoids scratching the crankshaft surface, preventing secondary damage to the workpiece during cleaning and increasing the product yield. Simultaneously, after the crankshaft is axially clamped, the positioning mechanisms on both sides can rotate the crankshaft on the tray. During crankshaft cleaning, the nozzles only need to cover the top of the crankshaft; rotation achieves full circumferential coverage, reducing the number of nozzles required.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a rotatable positioning pallet for compatible conveying of crankshafts of various types of marine engines, comprising a bottom frame, a first clamping mechanism, a second clamping mechanism, and a counterweight box. The first clamping mechanism and the second clamping mechanism are respectively disposed at both ends of the top surface of the bottom frame. The counterweight box is installed on the bottom frame and located at one end of the bottom frame where the second clamping mechanism is installed, for assembling a weight and preventing eccentricity. The first clamping mechanism includes a fixed center and a positioning pin that are parallel to each other. Both the fixed center and the positioning pin are arranged along the length direction of the bottom frame. The fixed center can rotate or be fixed relative to the bottom frame about an axis. The positioning pin can move or be fixed along the axial direction and be fixed relative to the fixed center. The positioning pin is used to cooperate with the positioning pin hole of the crankshaft to fix the crankshaft circumferentially relative to the fixed center. The second clamping mechanism includes a movable center, which is coaxial with the fixed center and can move or be fixed relative to the bottom frame along the axial direction. The fixed center and the movable center are respectively used to mate with the machining center holes at both ends of the crankshaft to fix the crankshaft axially.

[0006] Furthermore, the first clamping mechanism also includes a fixed frame, a first rotating shaft, a rotary drive disk, a top mounting flange, and a plurality of spring positioning beads distributed circumferentially along the first rotating shaft. The fixed frame is installed on the top surface of the bottom frame away from the second clamping mechanism. The first rotating shaft is arranged along the length of the bottom frame and is rotatably connected to the fixed frame. One end of the first rotating shaft is connected to the rotary drive disk, and the other end is connected to the top mounting flange. The fixed top is connected to the top mounting flange, and the positioning pin is connected to the fixed top. The spring positioning beads are installed on the fixed frame. The outer wall of the first rotating shaft is provided with a plurality of grooves circumferentially, and the spring positioning beads are matched with the grooves one by one to fix the first rotating shaft circumferentially relative to the fixed frame.

[0007] Furthermore, the first clamping mechanism also includes a positioning pin mounting assembly, which includes a transition ring plate, a pin seat, a spring, and a handle. The transition ring plate is sleeved on the outer periphery of the fixed center, connected to the center mounting flange on one axial side and to the pin seat on the other side. The positioning pin is rotatably connected to the pin seat. The pin seat has a bayonet along the radial direction. The spring is sleeved on the positioning pin, connected to the pin seat on one axial end and to the positioning pin on the other end. The handle is connected to the positioning pin and is used to drive the positioning pin to move axially and engage with the bayonet.

[0008] Furthermore, the second clamping mechanism also includes a transverse sliding groove, a movable frame, a second rotating shaft, a transverse locking handle, and a transverse locking block. The transverse sliding groove and the second rotating shaft are both arranged along the length direction of the bottom frame. The transverse sliding groove is installed on the top surface of the bottom frame at the end away from the first clamping mechanism. The movable frame is slidably connected to the transverse sliding groove. The movable center is connected to the movable frame. The second rotating shaft is rotatably connected to the movable frame. The transverse locking handle is connected to the second rotating shaft. An eccentric shaft section is provided in the middle of the second rotating shaft. The transverse locking block is arranged along the width direction of the bottom frame. A guide rod and a lifting rod are vertically provided on the top surface. The guide rod is slidably connected to the movable frame. The top end of the lifting rod is rotatably connected to the eccentric shaft section. Locking racks are provided at both ends of the top surface of the transverse locking block. The bottom frame is provided with a pair of fixed racks that engage with the locking racks.

[0009] Furthermore, the second clamping mechanism also includes a translation sleeve, a nut, a lead screw, and a translation drive handwheel. The translation sleeve is slidably connected to the moving frame. One end of the translation sleeve is connected to the moving center, and the other end is connected to the nut. The lead screw is rotatably connected to the moving frame. One end is coaxially disposed inside the translation sleeve and cooperates with the nut, and the other end is connected to the translation drive handwheel.

[0010] Furthermore, the second clamping mechanism also includes a translation locking mechanism, which includes a bidirectional screw, a pair of locking sleeves, and a translation locking handle. The bidirectional screw is vertically disposed on the radial side of the translation sleeve and is rotatably connected to the moving frame. The inner walls of the pair of locking sleeves are threadedly connected to the bidirectional screw, and the outer walls are slidably connected to the moving frame. The pair of locking sleeves are symmetrically arranged on the upper and lower sides of the translation sleeve and are frictionally connected to the outer wall of the translation sleeve for axially fixing the translation sleeve. The translation locking handle is installed at the top of the bidirectional screw.

[0011] Furthermore, the bottom frame is provided with a workpiece scale plate, which is parallel to and aligned with the transverse sliding groove.

[0012] Furthermore, tray positioning holes are provided at both ends of the bottom surface of the bottom frame.

[0013] Furthermore, multiple pairs of wear-resistant blocks for positioning are spaced apart on the outer walls of both sides of the bottom frame, and multiple conveying wear-resistant plates are provided on the bottom surface of the bottom frame along the length direction.

[0014] Furthermore, the bottom surface of the conveying wear-resistant plate is provided with a conveying guide strip along the width direction of the bottom frame.

[0015] Compared with the prior art, the advantages of the rotatable positioning pallet for conveying crankshafts of various types of marine engines described in this invention are: 1. This invention changes the traditional pallet positioning method using journals and bevels to a method using center holes and locating pin holes machined at both ends of the crankshaft for positioning and clamping. The center holes are clamping holes used during crankshaft machining and have no practical use requirements afterward. This avoids the problem of scratching the workpiece surface, greatly improves the workpiece qualification rate, and reduces the number of secondary reworks of the crankshaft.

[0016] 2. Traditional crankshaft cleaning fixtures prevent crankshaft rotation, requiring nozzles to be arranged omnidirectionally around the crankshaft to fully cover its circumferential surface. This invention clamps and positions the crankshaft, then drives a fixed ejector pin to rotate, which in turn moves the crankshaft using a positioning pin. During cleaning, the nozzles only need to cover the top surface of the crankshaft; the fixed nozzles, in conjunction with the crankshaft's rotation, efficiently cover the entire circumferential surface to be cleaned. This significantly reduces the number of nozzles, their arrangement range, and the difficulty of placement. Furthermore, the single-sided fixed nozzles avoid the jet splash resistance between nozzles that occurs with a full circumferential arrangement, thus improving cleaning efficiency.

[0017] 3. This invention uses a handle to drive the locating pin axially, which then engages with the bayonet, achieving axial adjustment and fixing of the locating pin. When assembling the fixing center with the crankshaft, the locating pin is axially retracted and fixed to avoid interference with the assembly and improve assembly efficiency. After the fixing center and the locating pin hole of the crankshaft are aligned, the circumferential position of the locating pin is adjusted, allowing it to extend and assemble with the locating pin hole of the crankshaft, completing the synchronous circumferential fixing of the crankshaft and the fixing center.

[0018] 4. This invention indirectly achieves elastic positioning of the crankshaft circumferentially by using spring positioning beads that engage with multiple grooves circumferentially provided on the outer wall of the first rotating shaft. This not only provides a fixing function during transport of the pallet after assembly with the crankshaft, preventing crankshaft rotation and potential tipping accidents due to eccentricity, but also does not restrict crankshaft rotation under external force, achieving a fully circumferential cleaning process.

[0019] 5. Considering the significant weight of the second clamping mechanism, and to ensure the strength of the positioning structure matches its weight, this invention employs a matching rack structure for axial fixation. While the rack structure offers reliable strength and accurate positioning, its inherent structural characteristics result in a minimum positioning step distance (i.e., rack tooth pitch). Therefore, the rack structure cannot guarantee axial clamping and positioning with the crankshaft. To address this, this invention uses a transverse sliding groove, a moving frame, and the rack structure as the primary axial adjustment and fixing structure, and designs a translation sleeve, nut, and lead screw as the secondary axial adjustment and fixing mechanism. The primary axial adjustment and fixing structure serves to ensure strength matching and to move the moving tip to a distance of less than or equal to 160mm from the crankshaft. The secondary axial adjustment and fixing structure works by rotating the translation drive handwheel, which drives the moving tip to extend via the lead screw and nut, axially pressing and fixing the crankshaft. A translation locking mechanism then locks the axial position of the moving tip in place. This invention, through the combined use of the secondary axial adjustment and fixing structure, achieves reliable axial fixation of the crankshaft, preventing crankshaft movement and avoiding the risk of the crankshaft falling.

[0020] 6. The present invention is equipped with a counterweight box, which can prevent the center of gravity from shifting to the fixed tip when clamping small parts, thus preventing the pallet from getting stuck on the conveyor mechanism.

[0021] 7. The present invention is equipped with a workpiece scale plate, which can mark the position of the moving tip when clamping crankshafts of different lengths, making it convenient for workers to operate. Attached Figure Description

[0022] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1This is a schematic diagram of the structure of a rotatable positioning tray for conveying crankshafts compatible with various types of marine engines, as described in this invention. Figure 1 ; Figure 2 This is a schematic diagram of the structure of a rotatable positioning tray for conveying crankshafts compatible with various types of marine engines, as described in this invention. Figure 2 ; Figure 3 This is a front view of a test device for a rotatable positioning tray compatible with crankshaft conveying of various types of marine engines, as described in this invention. Figure 4 This is a schematic diagram of the structure of the first clamping mechanism of the present invention; Figure 5 This is a right view of the first clamping mechanism of the present invention; Figure 6 For the present invention Figure 5 A sectional view along line A in the middle; Figure 7 This is a front view of the first clamping mechanism of the present invention; Figure 8 This is a schematic diagram of the positioning pin mounting assembly described in this invention; Figure 9 This is an exploded view of the positioning pin mounting assembly described in this invention; Figure 10 This is a schematic diagram of the structure of the second clamping mechanism of the present invention; Figure 11 This is a front view of the second clamping mechanism of the present invention; Figure 12 For the present invention Figure 11 Sectional view along line B; Figure 13 This is a left view of the second clamping mechanism of the present invention; Figure 14 For the present invention Figure 13 A sectional view along the C-axis; Figure 15 For the present invention Figure 11 A sectional view along the D direction; Figure 16 This is a schematic diagram of the bottom frame structure described in this invention; Figure 17 This is a bottom view of the bottom frame described in this invention; Figure 18 For the present invention Figure 16 A magnified view of a section at point E in the middle; In the diagram: 1-bottom frame; 2-first clamping mechanism; 3-second clamping mechanism; 4-counterweight box; 21-Fixed center; 22-Positioning pin; 23-Fixed bracket; 24-First rotating shaft; 25-Rotary drive disc; 26-Center mounting flange; 27-Spring positioning ball; 201-Adapter ring plate; 202-Pin seat; 203-Spring; 204-Handle; 205-Bayonet; 206-Padded block; 31-Moving center; 32-Transverse sliding groove; 33-Moving frame; 34-Second rotating shaft; 35-Transverse locking handle; 36-Transverse locking block; 341-Eccentric shaft section; 361-Guide rod; 362-Lifting rod; 363-Locking rack; 364-Fixed rack; 301 - Translation sleeve; 302 - Nut; 303 - Lead screw; 304 - Translation drive handwheel; 3001 - Double-acting screw; 3002 - Locking sleeve; 3003 - Translation locking handle; 11-Pallet positioning hole; 12-Wear-resistant block for positioning; 13-Conveyor wear-resistant plate; 14-Conveyor guide strip. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present invention can be combined with each other, and the described embodiments are only some embodiments of the present invention, not all embodiments.

[0024] I. Detailed Implementation Method 1, see [link / reference] Figure 1-18 This embodiment describes a rotatable positioning pallet for conveying crankshafts compatible with various types of marine engines. It includes a bottom frame 1, a first clamping mechanism 2, a second clamping mechanism 3, and a counterweight box 4. The first clamping mechanism 2 and the second clamping mechanism 3 are respectively disposed at both ends of the top surface of the bottom frame 1. The counterweight box 4 is mounted on the bottom frame 1 and is located at one end of the bottom frame 1 where the second clamping mechanism 3 is mounted. It is used to assemble a weight and prevent eccentricity. The first clamping mechanism 2 includes a fixed center 21 and a positioning pin 22 that are parallel to each other. The fixed center 21 and the positioning pin 22 are both arranged along the length direction of the bottom frame 1. The fixed center 21 can rotate or be fixed relative to the bottom frame 1 about an axis. The positioning pin 22 can move or be fixed along the axial direction and is fixed relative to the fixed center 21. The positioning pin 22 is used to cooperate with the positioning pin hole of the crankshaft to fix the crankshaft circumferentially relative to the fixed center 21. The second clamping mechanism 3 includes a movable tip 31, which is coaxial with the fixed tip 21 and can move or be fixed relative to the bottom frame 1 along the axial direction. The fixed center 21 and the movable center 31 are respectively used to mate with the machining center holes at both ends of the crankshaft to fix the crankshaft axially.

[0025] The first clamping mechanism 2 further includes a fixed frame 23, a first rotating shaft 24, a rotary drive disk 25, a top mounting flange 26, and a plurality of spring positioning beads 27 distributed circumferentially along the first rotating shaft 24. The fixed frame 23 is installed on the top surface of the bottom frame 1 at the end away from the second clamping mechanism 3. The first rotating shaft 24 is arranged along the length direction of the bottom frame 1 and is rotatably connected to the fixed frame 23. One end of the first rotating shaft 24 is connected to the rotary drive disk 25, and the other end is connected to the top mounting flange 26. The fixed top 21 is connected to the top mounting flange 26, and the positioning pin 22 is connected to the fixed top 21. The spring positioning beads 27 are installed on the fixed frame 23. The outer wall of the first rotating shaft 24 is provided with a plurality of grooves circumferentially. The spring positioning beads 27 are matched with the grooves one by one to fix the first rotating shaft 24 circumferentially relative to the fixed frame 23.

[0026] The first clamping mechanism 2 further includes a positioning pin mounting assembly, which includes a transition ring plate 201, a pin seat 202, a spring 203, and a handle 204. The transition ring plate 201 is coaxially sleeved on the outer periphery of the fixed center 21, with one axial side connected to the center mounting flange 26 and the other side connected to the pin seat 202. The positioning pin 22 is rotatably connected to the pin seat 202 and can slide relative to the pin seat 202 along the axial direction. The pin seat 202 is provided with a bayonet 205 along the radial direction. The bayonet 205 is U-shaped. The spring 203 is sleeved on the positioning pin 22, with one end axially close to the transition ring plate 201 connected to the pin seat 202 and the other end connected to the positioning pin 22. The handle 204 is connected to the positioning pin 22 and is used to drive the positioning pin 22 to move axially and engage with the bayonet 205.

[0027] The positioning pin mounting assembly also includes a pad 206, which is sandwiched between the adapter ring plate 201 and the pin seat 202 to adjust the axial relative position of the fixing tip 21 and adapt to the assembly of crankshafts with shorter lengths.

[0028] The second clamping mechanism 3 further includes a transverse sliding groove 32, a movable frame 33, a second rotating shaft 34, a transverse locking handle 35, and a transverse locking block 36. The transverse sliding groove 32 and the second rotating shaft 34 are both arranged along the length of the bottom frame 1. The transverse sliding groove 32 is installed on the top surface of the bottom frame 1 at the end away from the first clamping mechanism 2. The movable frame 33 is slidably connected to the transverse sliding groove 32. The movable center point 31 is connected to the movable frame 33. The second rotating shaft 34 is rotatably connected to the movable frame 33. The transverse locking handle... 35 is connected to the second rotating shaft 34, the second rotating shaft 34 has an eccentric shaft section 341 in the middle, the transverse locking block 36 is arranged along the width direction of the bottom frame 1, the top surface is vertically provided with a guide rod 361 and a lifting rod 362, the guide rod 361 is slidably connected to the moving frame 33, the top end of the lifting rod 362 is rotatably connected to the eccentric shaft section 341, the two ends of the top surface of the transverse locking block 36 are provided with locking racks 363, the bottom frame 1 is provided with a pair of fixed racks 364 that engage with the locking racks 363. The fixed racks 364 and the locking racks 363 are arranged vertically opposite each other.

[0029] The second clamping mechanism 3 also includes a translation sleeve 301, a nut 302, a lead screw 303, and a translation drive handwheel 304. The translation sleeve 301 is slidably connected to the moving frame 33. One end of the translation sleeve 301 is connected to the moving center 31, and the other end is connected to the nut 302. The lead screw 303 is rotatably connected to the moving frame 33. One end is coaxially disposed inside the translation sleeve 301 and cooperates with the nut 302, and the other end is connected to the translation drive handwheel 304.

[0030] The second clamping mechanism 3 further includes a translation locking mechanism, which includes a bidirectional screw 3001, a pair of locking sleeves 3002, and a translation locking handle 3003. The bidirectional screw 3001 is vertically arranged on the radial side of the translation sleeve 301 and is rotatably connected to the moving frame 33. The inner walls of the pair of locking sleeves 3002 are threadedly connected to the bidirectional screw 3001, and the outer walls are slidably connected to the moving frame 33. The pair of locking sleeves 3002 are symmetrically arranged on the upper and lower sides of the translation sleeve 301 and are frictionally connected to the outer wall of the translation sleeve 301 for axially fixing the translation sleeve 301. The translation locking handle 3003 is installed at the top of the bidirectional screw 3001.

[0031] The bottom frame 1 is provided with a workpiece scale plate, which is parallel and aligned with the transverse sliding groove 32. It is used to mark the position of the moving tip 31 when clamping crankshafts of different lengths, so as to facilitate worker operation.

[0032] The bottom frame 1 has tray positioning holes 11 at both ends of its bottom surface. These holes are used to work with the bottom positioning mechanism after the tray is in place, ensuring that the tray stops accurately and facilitating subsequent cleaning operations.

[0033] The outer walls on both sides of the bottom frame 1 are provided with multiple pairs of wear-resistant blocks 12 for positioning. These blocks collide with the material blocking mechanism when the pallet is in position. The wear-resistant blocks 12 are made of a material with high hardness and wear resistance to prevent scratches and dents from affecting the accuracy of the stopping position due to long-term collisions. The bottom surface of the bottom frame 1 is provided with multiple conveying wear-resistant plates 13 along the length direction for contacting the conveying mechanism and moving forward by friction. The surface of the conveying wear-resistant plates 13 is treated with wear resistance.

[0034] The bottom surface of the conveying wear-resistant plate 13 is provided with a conveying guide strip 14 along the width direction of the bottom frame 1 for guiding the pallet conveying and ensuring the positional accuracy of the pallet conveying.

[0035] The working principle of this invention is as follows: Initially, the positioning pin 22 is in the retracted position. The crankshaft to be cleaned is hoisted, and the center holes at both ends of the crankshaft are first coaxially aligned with the fixed center 21 and the movable center 31, respectively. (Refer to the attached diagram.) Figure 6 Then, adjust the rotary drive disc 25 to drive the first rotating shaft 24 to rotate. Through the center mounting flange 26 and the fixed center 21, drive the positioning pin 22 to rotate until the positioning pin 22 and the positioning pin hole of the crankshaft are coaxially aligned and the positioning pin 22 extends out.

[0036] Then, refer to the appendix. Figure 11 and 14 The movable frame 33 is manually pushed to slide along the transverse sliding groove 32. The relative position of the movable center 31 is observed through the workpiece scale plate until the distance between the movable center 31 and the crankshaft is less than or equal to 160mm. Then, the transverse locking handle 35 is turned, causing the eccentric shaft section 341 in the middle of the second rotating shaft 34 to rotate relative to the lifting rod 362, causing the lifting rod 362 to rise, which in turn causes the transverse locking block 36 to rise along the guide rod 361, so that the locking rack 363 meshes with the fixed rack 364. See Appendix Figure 14 and 15 Then, adjust the translation drive handwheel 304 to drive the lead screw 303 to rotate, and drive the nut 302 to push the translation sleeve 301 to drive the moving tip 31 to extend axially. After axially clamping and fixing the crankshaft to be cleaned, rotate the translation locking handle 3003 to drive the bidirectional screw 3001 to rotate. The translation sleeve 301 is axially fixed by a pair of locking sleeves 3002, thus completing the coaxial clamping and fixing and circumferential synchronous fixing of the present invention with the crankshaft to be cleaned.

[0037] Finally, adjust the rotary drive disc 25 to rotate the first rotating shaft 24 and assemble it with the spring positioning ball 27, elastically fixing the crankshaft to be cleaned circumferentially to prevent rotation during pallet transport and avoid tilting. Transport the pallet to the cleaning station, and drive the rotary drive disc 25 to rotate the crankshaft to be cleaned. With the help of the fixed nozzles arranged above the cleaning station, the circumferential surface of the crankshaft is fully covered for cleaning.

[0038] When replacing the crankshaft with one of the same size after cleaning, refer to the attached document. Figure 14 The present invention only requires adjusting the translation drive handwheel 304 to drive the lead screw 303 to rotate, and the drive nut 302 to adjust the translation sleeve 301 to drive the moving tip 31 to move, so as to achieve rapid axial clamping and assembly of crankshafts of the same size.

[0039] See attached document Figure 4 and 8 This invention adopts a modular design and can be applied to the conveying of various types of marine engine crankshafts. When crankshafts with different sizes of clamping and positioning pin holes are used, only the corresponding positioning pin mounting components need to be replaced to achieve the assembly and conveying of the corresponding type of marine engine crankshaft.

[0040] The embodiments of the present invention disclosed above are merely illustrative of the invention. These embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention.

Claims

1. A rotatable positioning pallet for conveying crankshafts compatible with various types of marine engines, characterized in that, It includes a bottom frame (1), a first clamping mechanism (2), a second clamping mechanism (3), and a counterweight box (4). The first clamping mechanism (2) and the second clamping mechanism (3) are respectively set at both ends of the top surface of the bottom frame (1). The counterweight box (4) is installed on the bottom frame (1) at one end of the bottom frame (1) where the second clamping mechanism (3) is installed, and is used to assemble the weight and prevent eccentricity. The first clamping mechanism (2) includes a fixed center (21) and a positioning pin (22) that are parallel to each other. The fixed center (21) and the positioning pin (22) are both arranged along the length direction of the bottom frame (1). The fixed center (21) can rotate about the axis relative to the bottom frame (1). The positioning pin (22) can move along the axis and be fixed relative to the fixed center (21). The positioning pin (22) is used to cooperate with the positioning pin hole of the crankshaft to fix the crankshaft circumferentially relative to the fixed center (21). The second clamping mechanism (3) includes a movable tip (31), which is coaxial with the fixed tip (21) and can move or be fixed relative to the bottom frame (1) in the axial direction. The fixed center (21) and the movable center (31) are respectively used to mate with the machining center holes at both ends of the crankshaft to fix the crankshaft axially; The first clamping mechanism (2) further includes a fixed frame (23), a first rotating shaft (24), a rotary drive disk (25), a top mounting flange (26), and a plurality of spring positioning beads (27) distributed circumferentially along the first rotating shaft (24). The fixed frame (23) is installed on the top surface of the bottom frame (1) at one end away from the second clamping mechanism (3). The first rotating shaft (24) is arranged along the length direction of the bottom frame (1) and is rotatably connected to the fixed frame (23). One end of the first rotating shaft (24) is connected to the rotary drive disk (25), and the other end is connected to the top mounting flange (26). The fixed top (21) is connected to the top mounting flange (26), and the positioning pin (22) is connected to the fixed top (21). The spring positioning beads (27) are installed on the fixed frame (23). The outer wall of the first rotating shaft (24) is provided with a plurality of grooves circumferentially. The spring positioning beads (27) are matched with the grooves one by one to fix the first rotating shaft (24) circumferentially relative to the fixed frame (23). The first clamping mechanism (2) further includes a positioning pin mounting assembly, which includes a transition ring plate (201), a pin seat (202), a spring (203), and a handle (204). The transition ring plate (201) is sleeved on the outer periphery of the fixed center (21), and is connected to the center mounting flange (26) on one axial side and to the pin seat (202) on the other side. The positioning pin (22) is rotatably connected to the pin seat (202). The pin seat (202) is provided with a bayonet (205) in the radial direction. The spring (203) is sleeved on the positioning pin (22), and is connected to the pin seat (202) on one axial end and to the positioning pin (22) on the other end. The handle (204) is connected to the positioning pin (22) and is used to drive the positioning pin (22) to move axially and engage with the bayonet (205). The second clamping mechanism (3) further includes a transverse sliding groove (32), a movable frame (33), a second rotating shaft (34), a transverse locking handle (35), and a transverse locking block (36). The transverse sliding groove (32) and the second rotating shaft (34) are both arranged along the length of the bottom frame (1). The transverse sliding groove (32) is installed on the top surface of the bottom frame (1) away from the first clamping mechanism (2). The movable frame (33) is slidably connected to the transverse sliding groove (32). The movable tip (31) is connected to the movable frame (33). The second rotating shaft (34) is rotatably connected to the movable frame (33). The transverse locking handle (35) is... The handle (35) is connected to the second rotating shaft (34), and the second rotating shaft (34) has an eccentric shaft section (341) in the middle. The transverse locking block (36) is arranged along the width direction of the bottom frame (1). The top surface is vertically provided with a guide rod (361) and a lifting rod (362). The guide rod (361) is slidably connected to the moving frame (33). The top end of the lifting rod (362) is rotatably connected to the eccentric shaft section (341). The two ends of the top surface of the transverse locking block (36) are provided with locking racks (363). The bottom frame (1) is provided with a pair of fixed racks (364) that fit with the locking racks (363).

2. A rotatable positioning pallet for conveying crankshafts compatible with multiple types of marine engines according to claim 1, characterized in that, The second clamping mechanism (3) further includes a translation sleeve (301), a nut (302), a lead screw (303), and a translation drive handwheel (304). The translation sleeve (301) is slidably connected to the moving frame (33). One end of the translation sleeve (301) is connected to the moving center (31), and the other end is connected to the nut (302). The lead screw (303) is rotatably connected to the moving frame (33). One end is coaxially arranged inside the translation sleeve (301) and cooperates with the nut (302). The other end is connected to the translation drive handwheel (304).

3. A rotatable positioning pallet for conveying crankshafts compatible with multiple types of marine engines according to claim 2, characterized in that, The second clamping mechanism (3) further includes a translation locking mechanism, which includes a bidirectional screw (3001), a pair of locking sleeves (3002), and a translation locking handle (3003). The bidirectional screw (3001) is vertically arranged on the radial side of the translation sleeve (301) and is rotatably connected to the moving frame (33). The inner wall of the pair of locking sleeves (3002) is threadedly connected to the bidirectional screw (3001), and the outer wall is slidably connected to the moving frame (33). The pair of locking sleeves (3002) are symmetrically arranged on the upper and lower sides of the translation sleeve (301) and are frictionally connected to the outer wall of the translation sleeve (301) for axially fixing the translation sleeve (301). The translation locking handle (3003) is installed at the top of the bidirectional screw (3001).

4. A rotatable positioning pallet for conveying crankshafts compatible with multiple types of marine engines according to claim 1, characterized in that, The bottom frame (1) is provided with a workpiece scale plate, which is parallel to and aligned with the transverse sliding groove (32).

5. A rotatable positioning pallet for conveying crankshafts compatible with multiple types of marine engines according to claim 1, characterized in that, The bottom frame (1) has tray positioning holes (11) at both ends of its bottom surface.

6. A rotatable positioning pallet for conveying crankshafts compatible with multiple types of marine engines according to claim 1, characterized in that, The outer walls on both sides of the bottom frame (1) are provided with multiple pairs of wear-resistant blocks (12) for positioning, and the bottom surface of the bottom frame (1) is provided with multiple conveying wear-resistant plates (13) along the length direction.

7. A rotatable positioning pallet for conveying crankshafts compatible with multiple types of marine engines according to claim 6, characterized in that, The bottom surface of the conveying wear-resistant plate (13) is provided with a conveying guide strip (14) along the width direction of the bottom frame (1).

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