Opening caliper

Abstract

The utility model relates to the technical field of pipe welding machining, in particular to opening calipers which comprise a rack and a three-jaw chuck, U-shaped grooves are correspondingly formed in the top of the rack and the three-jaw chuck, the rack comprises a back plate and a shell, a fluted disc is arranged between the back plate and the shell, one side of the fluted disc is rotationally installed at the U-shaped groove of the back plate, and the other side of the fluted disc is rotationally installed at the other side of the fluted disc. The three-jaw chuck is fixedly connected with the end face of the side, away from the back plate, of the fluted disc, an annular groove is formed in the circumferential side face of the fluted disc, pin rollers are evenly installed in the annular groove, a driving gear is rotatably installed on the rack and engaged with the pin rollers in a rolling mode, and the three-jaw chuck is connected with the fluted disc. And meanwhile, the fluted disc is rotationally installed on the rack, the annular groove is formed in the side face of the fluted disc, the pin roller is continuously installed in the annular groove, the pin roller is stirred through the driving gear, and therefore the whole fluted disc is driven to rotate, in the scheme, the transmission effect is improved through rolling meshing of the gear and the balls, and slipping is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of pipe welding processing, in particular to an opening caliper. Background Art

[0002] In the mechanical equipment used in shipyards, petroleum, petrochemical, chemical, power plants and other industries, there are often a large number of circular parts such as elbows and / or flanges. In the process of processing, manufacturing and assembling these equipment, it is necessary to weld the two circumferential welds at the inner and outer corners of these elbows and / or flanges.

[0003] A large pipe girth welding positioner with Chinese utility model patent number CN100522459C is driven by chains and sprockets. An opening is provided on the transmission gear. The pipe to be welded is set on the gear. The sprocket and chain are driven to rotate and shift the pipe to achieve welding. The chain is fixed on the transmission gear. Therefore, the chain and the transmission gear need to have sufficient connection strength to drive the gear to rotate. Therefore, the circumferential direction slipping will occur. This not only brings a lot of inconvenience to the operator, but also reduces the welding efficiency. Based on this, the present application proposes an open caliper. Utility Model Content

[0004] The purpose of the utility model is to provide an open caliper to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an open-end caliper, comprising a frame and a three-jaw chuck, the top of the frame and the three-jaw chuck are respectively provided with U-shaped grooves, the frame comprises a back plate and a shell, a toothed disc is provided between the back plate and the shell, one side of the toothed disc is rotatably mounted on the U-shaped groove of the back plate, the three-jaw chuck is fixedly connected to the end face of the toothed disc away from the back plate, an annular groove is provided on the circumferential side of the toothed disc, rollers are evenly installed in the annular groove, a driving gear is rotatably mounted on the frame, and the driving gear is rollingly engaged with the rollers.

[0006] By adopting the above technical solution: the three-jaw chuck is connected to the toothed disc, and the toothed disc is rotatably installed on the frame, an annular groove is opened on the side of the toothed disc, and rollers are further installed in the annular groove, and then the rollers are driven by the driving gear to drive the entire toothed disc to rotate. In this solution, the rolling engagement of the gears and the balls is utilized to improve the transmission effect and reduce slippage.

[0007] The back plate is fixedly connected to a disc seat corresponding to the toothed disc, and a first roller is arranged in an annular manner on the disc seat, and the diameter surface of the first roller is parallel to the end surface of the disc seat. A ring guide groove is provided on the side of the toothed disc close to the back plate, and the first roller is slidably installed in the annular guide groove. A plurality of guide seats are arranged in an annular manner along the outer edge of the toothed disc on the back plate, and the guide seat is a U-shaped structure and the guide seat is clamped on the outer edge of the toothed disc. Second rollers are arranged on both sides of the guide seat along the radial direction of the toothed disc, and the diameter surface of the second roller is arranged parallel to the end surface of the toothed disc. The second roller is in rolling contact with the circumferential outer wall of the toothed disc. Third rollers are installed on both ends of the guide seat along the axial direction of the toothed disc, and the diameter surface of the third roller is tangent to the diameter surface of the toothed disc. The third roller is in rolling contact with the end surfaces on both sides of the toothed disc, and a gap is left between the end surface of the first roller and the inner surface corresponding to the annular guide groove and the end surface.

[0008] By adopting the above technical solution: a guide seat is set between the toothed disc and the back plate, the guide seat is distributed in a ring shape on the edge of the toothed disc, and the toothed disc is clamped by the second roller and the third roller. Therefore, the guide seat can position the entire toothed disc and reduce the friction resistance between the toothed disc and the guide seat during rotation. Furthermore, by setting the first roller, the movement trajectory of the toothed disc can be limited, and a very small friction resistance can also be achieved between the first roller and the annular guide groove. In addition, by positioning the toothed disc through the guide seat, a gap can be left between the end face of the first roller and the inner face of the annular guide groove, thereby further reducing the resistance and thus reducing the use burden of the driving gear.

[0009] The three-jaw chuck includes a disc body, a disc cover and three jaws that are equiangularly distributed and move at equal distances relative to the center of the three-jaw chuck, the disc body is fixedly connected to the gear disc, the disc body is provided with an annular cavity, the disc cover is installed on the opening of the annular cavity, the outer end surface of the disc cover is provided with a sliding seat that is slidably connected to each jaw, and two levers are provided between adjacent jaws in the annular cavity, the rotation center of each lever is rotationally connected to the three-jaw chuck, the ends of the two levers that are close to each other are rotationally connected, and the ends of the two levers that are far away from each other are rotationally connected to their respective corresponding jaws, the disc cover is provided with a sliding groove corresponding to the movement trajectory of the jaws, and also includes a driving mechanism, the driving mechanism is used to drive any jaw to move linearly.

[0010] By adopting the above technical solution: the movement of one of the clamping jaws can drive the other two clamping jaws to move synchronously, realizing equidistant movement of the clamping jaws, so that the three clamping jaws can have higher centering accuracy, and through one-time clamping, the clamping and adjustment steps are reduced, which has a better use effect.

[0011] The driving mechanism includes a bracket, a bearing seat and a first motor. The bearing seat is fixedly installed on the disk cover. A threaded column is rotatably installed in the bearing seat. A threaded groove is opened at one end of the corresponding clamping jaw. One end of the threaded column is connected to the threaded groove, and the other end of the threaded column is connected to the secondary face gear. The bracket is fixedly connected to the frame. A lifting mechanism is provided on the bracket. The first motor is fixedly connected to the moving end of the lifting mechanism. A main face gear meshing with the secondary face gear is connected to the shaft extension end of the first motor. The lifting mechanism is used for separating and engaging the main and secondary face gears.

[0012] By adopting the above technical solution: a thread groove is opened at one end of one of the clamping jaws, a threaded column is rotatably installed in the bearing seat, and the first motor drives the threaded column to rotate through the engagement of the main and auxiliary surface gears, thereby driving the clamping jaw to reciprocate in the slide seat.

[0013] A fixing seat is provided on the bracket, the first motor is vertically slidably mounted on the fixing seat, a gear rack pair is provided inside the fixing seat, a second motor connected to the gear is installed on one side of the fixing seat, and the rack is vertically fixedly connected to the side of the first motor.

[0014] By adopting the above technical solution: the second motor drives the gear rack to move, thereby driving the first motor to rise or fall, thereby changing the meshing condition of the main face gear and the auxiliary face gear.

[0015] Technical effects and advantages of the utility model:

[0016] 1. In this scheme, the three-jaw chuck is connected to the toothed disc, and the toothed disc is rotatably installed on the frame. An annular groove is opened on the side of the toothed disc, and rollers are further installed in the annular groove. The rollers are then driven by the driving gear to drive the entire toothed disc to rotate. In this scheme, the rolling engagement of the gears and the balls is utilized to improve the transmission effect and reduce slippage.

[0017] 2. In this solution, a guide seat is arranged between the toothed disc and the back plate. The guide seat is distributed in a ring shape on the edge of the toothed disc and clamps the toothed disc through the second roller and the third roller. Therefore, the guide seat can position the entire toothed disc and reduce the friction resistance between the toothed disc and the guide seat during rotation.

[0018] 3. In this solution, the movement trajectory of the toothed disc can be limited by setting the first roller, and very small friction resistance can also be achieved between the first roller and the annular guide groove.

[0019] 4. In this solution, by positioning the toothed disc with the guide seat, a gap can be left between the end face of the first roller and the inner face of the annular guide groove, further reducing resistance and thus reducing the use burden of the driving gear. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1A schematic diagram of the overall structure of the opening caliper provided in this application;

[0021] Figure 2 for Figure 1 A schematic diagram of the enlarged structure at A in the middle;

[0022] Figure 3 A schematic diagram of the structure inside the frame of the open caliper provided in this application;

[0023] Figure 4 A schematic diagram of the structure of the disc cover of the open caliper provided in this application;

[0024] Figure 5 A schematic diagram of the structure of a three-jaw chuck with a disc cover removed provided in this application;

[0025] Figure 6 This is a schematic diagram of the structure of the driving mechanism provided in this application.

[0026] Figure numerals: 1. frame; 101. back plate; 102. shell; 2. three-jaw chuck; 201. disk cover; 211. slide groove; 202. disk body; 3. disk seat; 31. first roller; 4. toothed disk; 41. annular groove; 42. annular guide groove; 5. slide seat; 6. claw; 7. bearing seat; 8. secondary surface gear; 9. primary surface gear; 10. first motor; 11. second motor; 12. bracket; 13. reducer; 14. guide seat; 141. second roller; 142. third roller; 15. roller; 16. driving gear; 17. bridge disk; 18. lever. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] This embodiment provides Figure 1 The open caliper shown in the figure comprises a frame 1 and a three-jaw chuck 2. The top of the frame 1 and the three-jaw chuck 2 are both provided with corresponding U-shaped grooves. The frame 1 comprises a back plate 101 and a shell 102. A toothed disc 4 is provided between the back plate 101 and the shell 102. One side of the toothed disc 4 is rotatably mounted at the U-shaped groove of the back plate 101. The three-jaw chuck 2 is fixedly connected to the end face of the toothed disc 4 away from the back plate 101. An annular groove 41 is provided on the circumferential side of the toothed disc 4. Rollers 15 are evenly installed in the annular groove 41. A driving gear 16 is rotatably mounted on the frame 1. The driving gear 16 is in rolling engagement with the roller 15. Figure 3 As shown, the three-jaw chuck 2 is connected to the toothed disc 4 through a bridge disc 17, and the toothed disc 4 is rotatably mounted on the frame 1. An annular groove 41 is provided on the side of the toothed disc 4, and the roller 15 is further installed in the annular groove 41. The roller 15 is then driven by the driving gear 16 to drive the entire toothed disc 4 to rotate. In this solution, the rolling engagement of the gears and the balls is utilized to improve the transmission effect and reduce slippage.

[0029] For example Figure 3 As shown, a disc seat 3 corresponding to the toothed disc 4 is fixedly connected to the back plate 101, a first roller 31 is arranged in an annular manner on the disc seat 3, and the radial surface of the first roller 31 is parallel to the end surface of the disc seat 3. An annular guide groove 42 is provided on the side of the toothed disc 4 close to the back plate 101, and the first roller 31 is slidably installed in the annular guide groove 42. A plurality of guide seats 14 are arranged in an annular manner along the outer edge of the toothed disc 4 on the back plate 101, and the guide seats 14 are U-shaped structures and are clamped on the outer edge of the toothed disc 4. The guide seats 14 Second rollers 141 are provided on both sides of the radial direction of the toothed disc 4, the radial surface of the second roller 141 is arranged parallel to the end surface of the toothed disc 4, the second roller 141 is in rolling contact with the circumferential outer wall of the toothed disc 4, and third rollers 142 are installed on both ends of the guide seat 14 along the axial direction of the toothed disc 4, the radial surface of the third roller 142 is tangent to the radial surface of the toothed disc 4, and the third roller 142 is in rolling contact with the end surfaces of both sides of the toothed disc 4, and a gap is left between the end surface of the first roller 31 and the inner surface of the annular guide groove 42 corresponding to the end surface. A guide seat 14 is arranged between the toothed disc 4 and the back plate 101. The guide seat 14 is distributed in a ring shape on the edge of the toothed disc 4, and clamps the toothed disc 4 through the second roller 141 and the third roller 142. Therefore, the guide seat 14 can position the entire toothed disc 4 and reduce the friction resistance between the toothed disc 4 and the guide seat 14 during rotation. Furthermore, the movement trajectory of the toothed disc 4 can be limited by setting the first roller 31, and a very small friction resistance can also be achieved between the first roller 31 and the annular guide groove 42. In addition, by positioning the toothed disc 4 through the guide seat 14, a gap can be left between the end face of the first roller 31 and the inner face of the annular guide groove 42, thereby further reducing the resistance and thus reducing the use burden of the driving gear 16.

[0030] The three-jaw chuck 2 of this embodiment is as follows Figure 4 and 5As shown, it includes a disk body 202, a disk cover 201 and three claws 6 which are equiangularly distributed and move at equal distances relative to the center of the three-jaw chuck 2, the disk body 202 is fixedly connected to the toothed disk 4, the disk body 202 has an annular cavity, the disk cover 201 is installed on the opening of the annular cavity, the outer end surface of the disk cover 201 is provided with a slide seat 5 which is slidably connected to each claw 6, two levers 18a and 18b are provided between adjacent claws 6 in the annular cavity, the rotation center of each lever 18 is rotationally connected to the three-jaw chuck 2, the ends of the two levers 18a and 18b that are close to each other are rotationally connected, and the ends of the two levers 18a and 18b that are far away from each other are rotationally connected to their corresponding claws 6, the disk cover 201 is provided with a slide groove 211 corresponding to the movement trajectory of the claw 6, and also includes a driving mechanism, which is used to drive any claw 6 to move linearly. This embodiment uses the movement of the claw 6 located in the middle position, and drives the other two claws 6 to move synchronously by driving the claw 6 in the middle position, thereby realizing equidistant movement of the claws 6, so that the three claws 6 can have higher centering accuracy, and through one-time clamping, the clamping and adjustment steps are reduced, thereby having a better use effect.

[0031] Furthermore, combined with Figure 2 and Figure 6 As shown, the driving mechanism includes a bracket 12, a bearing seat 7 and a first motor 10. The bearing seat 7 is fixedly mounted on the disk cover 201. A threaded column is rotatably mounted in the bearing seat 7. A threaded groove is provided at one end of the corresponding clamping jaw. One end of the threaded column is connected to the threaded groove. The other end of the threaded column is connected to the secondary face gear 8. The bracket 12 is fixedly connected to the frame 1. A lifting mechanism is provided on the bracket 12. The first motor 10 is fixedly connected to the moving end of the lifting mechanism. The main face gear 9 meshing with the secondary face gear 8 is connected to the shaft extension end of the first motor 10. The lifting mechanism is used for the separation and engagement of the main and secondary face gears 8. A threaded groove is provided at one end of the clamping jaw in the middle position. A threaded column is rotatably mounted in the bearing seat 7. The first motor 10 drives the threaded column to rotate through the engagement of the main and secondary face gears 8, thereby driving the clamping jaw to reciprocate in the slide seat 5.

[0032] Furthermore, in this embodiment, a fixing seat is provided on the bracket 12, the first motor 10 is vertically slidably mounted on the fixing seat, a gear rack pair is provided in the fixing seat, a second motor 11 connected to the gear is installed on one side of the fixing seat, and the rack is vertically fixedly connected to the side of the first motor 10. The second motor 11 drives the rack of the driving gear 16 to move, thereby driving the first motor 10 to rise or fall, thereby changing the meshing condition of the main face gear 9 and the auxiliary face gear 8.

[0033] Working process: Place the pipe to be welded in the U-shaped notch on the frame 1, start the second motor 11 to lift the first motor 10, the main face gear 9 at the driving end of the first motor 10 meshes with the auxiliary face gear 8 at one end of the threaded column, start the first motor 10, and transmit power through the main and auxiliary face gears 8 to rotate the threaded column. At this time, the clamp moves inward and pulls up the lever 18b, and the other end of the lever 18b pulls down the lever 18a, and finally drives the other two clamps to move inward at the same time through the lever 18a to clamp the pipe, and then start the second motor 11. The motor 11 disengages the primary and secondary surface gears 8; at the same time, the driving gear 16 is connected to the reducer 13 through a transmission assembly, which can be a chain drive or a toothed belt drive. The driving gear 16 rolls and meshes with the roller 15 of the toothed disc 4, driving the toothed disc 4 to rotate as a whole until the welding operation of the pipe to be welded is completed. At this time, the driving gear 16 drives the toothed disc 4 back to the initial position, and the second motor 11 is started to lift the first motor 10 until the primary and secondary surface gears 8 are engaged, and the first motor 10 is started to disengage the clamping jaws from the pipe, and then the pipe is taken out.

[0034] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An open-end caliper, comprising a frame (1) and a three-jaw chuck (2), wherein the top of the frame (1) and the three-jaw chuck (2) are both provided with corresponding U-shaped grooves, characterized in that: The frame (1) comprises a back plate (101) and a shell (102), a toothed disc (4) is arranged between the back plate (101) and the shell (102), one side of the toothed disc (4) is rotatably mounted at a U-shaped groove of the back plate (101), the three-jaw chuck (2) is fixedly connected to an end face of the toothed disc (4) away from the back plate (101), an annular groove (41) is provided on the circumferential side surface of the toothed disc (4), rollers (15) are evenly mounted in the annular groove (41), a driving gear (16) is rotatably mounted on the frame (1), and the driving gear (16) is in rolling engagement with the roller (15).

2. The open-end caliper according to claim 1, characterized in that: The back plate (101) is fixedly connected to a disc seat (3) corresponding to the toothed disc (4); a first roller (31) is arranged in an annular shape on the disc seat (3); a radial surface of the first roller (31) is parallel to an end surface of the disc seat (3); an annular guide groove (42) is provided on a side of the toothed disc (4) close to the back plate (101); the first roller (31) is slidably mounted in the annular guide groove (42); a plurality of guide seats (14) are arranged in an annular shape along the outer edge of the toothed disc (4) on the back plate (101); the guide seats (14) are U-shaped structures and are clamped on the outer edge of the toothed disc (4); the guide seats (14) are 14) A second roller (141) is provided on both sides of the toothed disc (4) along the radial direction, the radial surface of the second roller (141) is arranged parallel to the end surface of the toothed disc (4), the second roller (141) is in rolling contact with the circumferential outer wall of the toothed disc (4), and a third roller (142) is installed on both ends of the guide seat (14) along the axial direction of the toothed disc (4), the radial surface of the third roller (142) is tangent to the radial surface of the toothed disc (4), the third roller (142) is in rolling contact with the end surfaces of both sides of the toothed disc (4), and a gap is left between the end surface of the first roller (31) and the inner surface of the annular guide groove (42) corresponding to the end surface.

3. The open-end caliper according to claim 1 or 2, characterized in that: The three-jaw chuck (2) comprises a chuck body (202), a chuck cover (201) and three claws (6) which are equiangularly distributed and move at equal distances relative to the center of the three-jaw chuck (2); the chuck body (202) is fixedly connected to the toothed disc (4); an annular cavity is provided in the chuck body (202); the chuck cover (201) is installed on the opening of the annular cavity; a sliding seat (5) which is slidably connected to each claw (6) is provided on the outer end surface of the chuck cover (201); two sliding seats (5) are provided between adjacent claws (6) in the annular cavity. The invention relates to a three-jaw chuck (2) having two levers (18a, 18b), wherein the rotation center of each lever (18) is rotationally connected to the three-jaw chuck (2), the ends of the two levers (18a, 18b) that are close to each other are rotationally connected, and the ends of the two levers (18a, 18b) that are far away from each other are rotationally connected to the corresponding claws (6), respectively. The disk cover (201) is provided with a slide groove (211) corresponding to the movement trajectory of the claws (6), and also includes a driving mechanism, wherein the driving mechanism is used to drive any claw (6) to move linearly.

4. The open-end caliper according to claim 3, characterized in that: The driving mechanism comprises a bracket (12), a bearing seat (7) and a first motor (10); the bearing seat (7) is fixedly mounted on the disk cover (201); a threaded column is rotatably mounted in the bearing seat (7); a threaded groove is provided at one end of a corresponding clamping jaw; one end of the threaded column is connected to the threaded groove; the other end of the threaded column is connected to a secondary face gear (8); the bracket (12) is fixedly connected to the frame (1); a lifting mechanism is provided on the bracket (12); the first motor (10) is fixedly connected to the moving end of the lifting mechanism; a main face gear (9) meshing with the secondary face gear (8) is connected to the shaft extension end of the first motor (10); and the lifting mechanism is used for separating and engaging the main and secondary face gears (8).

5. The open-end caliper according to claim 4, characterized in that: The bracket (12) is provided with a fixing seat, the first motor (10) is vertically slidably mounted on the fixing seat, a gear rack pair is provided inside the fixing seat, a second motor (11) connected to the gear is mounted on one side of the fixing seat, and the rack is vertically fixedly connected to the side of the first motor (10).

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