Cold rolling tube mill feed trolley feed locking device

Abstract

The present invention discloses a feeding and locking device for a feeding trolley of a cold rolling tube mill, belonging to the field of cold rolling clamping of pipes. It solves the problems in the prior art that the locking device on the feeding trolley can scratch the outer surface of the pipe, and at the same time has poor locking stability, affecting the quality of subsequent processing. The device includes a machine box, a hollow shaft, a clamping plate, a locking sleeve and a locking sleeve driving component; the hollow shaft is provided with three mounting ports on the side wall; three clamping plates are installed in the three mounting ports and can move radially along the hollow shaft. The outer side wall of the clamping plate has an outer guiding surface; the locking sleeve is sleeved on the hollow shaft and can move axially. The inner wall of the locking sleeve has an inner guiding surface. When the locking sleeve moves, the outer guiding surface cooperates with the inner guiding surface to drive multiple clamping plates to move simultaneously towards or away from the center line of the hollow shaft, so as to clamp or loosen the pipe; the locking sleeve driving component drives the locking sleeve to move relative to the hollow shaft. The present invention can avoid scratching the surface of the pipe, can stably lock the pipe, and improve the rolling quality of the pipe.

Description

Technical Field

[0001] The invention relates to the field of workpiece clamping, and in particular to a feeding locking device for a feeding trolley of a cold rolling mill. Background Art

[0002] In the cold rolling mill, the feed trolley is an important device that can clamp the tube through the locking device and then send the tube from the front to the back of the mill to complete the continuous rolling process.

[0003] In the prior art, a locking device for clamping a pipe is installed at the end of a hollow shaft. The locking device comprises three clamping members arranged circumferentially and enclosing a tubular shape, an annular spring enclosing the outer rings of the three clamping members to hold them together, and a buffer member disposed between each pair of adjacent clamping members to properly space them apart. For example, the locking device disclosed in patent publication number CN217413214U presents the following problems when used:

[0004] 1. After the pipe passes through the trolley channel, the end of the pipe rests on the inner wall of the clamp. The thrust of the pipe end overcomes the locking force of the spring, and the three clamps are opened. The pipe can then pass through the channel formed by the locking device. During this process, the inner walls of the three clamps are always in contact with the surface of the pipe, which can easily scratch the surface of the pipe and greatly affect the quality of the finished product.

[0005] 2. During the rolling process, the pipe may have a stringing problem. This string force can easily overcome the locking force of the annular spring, causing the locking device to be slightly opened, and thus unable to play a stable positioning effect on the pipe, affecting the pipe rolling effect, and easily causing the pipe end face to break;

[0006] 3. The length of the clamp will affect the length of the entire device. At the same time, an overly long clamp will interfere with other components when rotating at the end of the hollow shaft, affecting normal use, thus resulting in a shorter clamp. Summary of the Invention

[0007] In response to the shortcomings of the existing technology, the present invention provides a feeding and locking device for a cold rolling mill feeding trolley, which can prevent the surface of the pipe from being scratched, improve the rolling quality of the pipe, and at the same time can stably lock and feed the pipe.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] A feeding locking device for a cold rolling mill feeding carriage comprises a machine case and a hollow shaft rotatably arranged in the machine case, and is characterized in that it further comprises a clamping plate, a locking sleeve and a locking sleeve driving assembly;

[0010] The hollow shaft is provided with at least two mounting openings on the side wall in the circumferential direction;

[0011] The number of the holding plates is the same as that of the mounting openings, and they are respectively installed in each mounting opening, and can move radially along the hollow shaft. An outer guiding surface is provided on the outer side wall of the holding plate;

[0012] The locking sleeve is sleeved on the hollow shaft and can axially move relative to the hollow shaft. An inner guiding surface is provided on the inner wall of the locking sleeve. When the locking sleeve moves relative to the hollow shaft, the outer guiding surface cooperates with the inner guiding surface to drive multiple holding plates to move simultaneously towards or away from the center line of the hollow shaft, so as to hold or release the pipe;

[0013] The locking sleeve driving assembly is connected to the locking sleeve and drives the locking sleeve to move relative to the hollow shaft.

[0014] Preferably, the outer guiding surface is divided into a holding outer guiding surface and a releasing outer guiding surface, and the inner guiding surface is divided into a holding inner guiding surface and a releasing inner guiding surface;

[0015] During movement, the holding outer guiding surface cooperates with the holding inner guiding surface to press the holding plate towards the center line of the hollow shaft, and the releasing inner guiding surface cooperates with the releasing outer guiding surface to push the holding plate away from the center line of the hollow shaft.

[0016] Preferably, an outer step is provided on the outer side wall of the holding plate. One end of the outer step facing the inlet end of the hollow shaft is an inclined holding outer guiding surface. An inner step is provided on the inner side wall of the locking sleeve. One end of the inner step facing the outlet end of the hollow shaft is an inclined holding inner guiding surface. When the locking sleeve moves towards the outlet end side of the hollow shaft, the holding inner guiding surface presses down the holding outer guiding surface to make the holding plate move towards the center line of the hollow shaft.

[0017] Preferably, one end of the outer step corresponding to the outlet end of the hollow shaft is an inclined releasing outer guiding surface. A pushing plate is connected to the inner wall of the locking sleeve. One side of the pushing plate facing the inlet end of the hollow shaft is an inclined releasing inner guiding surface. When the locking sleeve moves towards the inlet end side of the hollow shaft, the releasing inner guiding surface abuts against the releasing outer guiding surface to make the holding plate move away from the center line of the hollow shaft.

[0018] Preferably, the locking sleeve driving assembly includes a connecting sleeve, a guiding sleeve, a sliding sleeve, a mounting ring, a driving frame and a driving component;

[0019] A base is provided on one side of the chassis corresponding to the outlet end of the hollow shaft. The guiding sleeve is installed on the base and corresponds to the outlet end of the hollow shaft;

[0020] The sliding sleeve is circumferentially limited and axially movable and cooperates in the guiding sleeve, and guiding wheels are provided on the left and right sides of the guiding sleeve;

[0021] The installation ring is axially limited and can be rotatably installed in the sliding sleeve in the circumferential direction;

[0022] One end of the connecting sleeve is connected to the locking sleeve, and the other end is connected to the installation ring;

[0023] The driving component is installed on the base. The driving frame is connected to the driving component and has a guiding groove that cooperates with two guiding wheels. When the driving component drives the driving frame to move up and down, the guiding groove cooperates with the guiding wheels to drive the connecting sleeve to move axially along the hollow shaft.

[0024] Preferably, the connecting sleeve has a connecting section and an extending section;

[0025] The diameter of the connecting section is larger than that of the extending section, and the connecting section is threadedly connected to the locking sleeve;

[0026] The extending section extends to the outside of the outlet end of the hollow shaft and is connected to the installation ring;

[0027] The extending section is formed by multiple extending pieces distributed in a circumferential manner at the end of the connecting section. There is a receiving groove on the outer side wall of the hollow shaft for receiving the extending pieces.

[0028] Preferably, the guiding groove is divided into an upper section and a lower section. The upper section is vertically arranged, and the lower section is inclined, driving the connecting sleeve to move through cooperation with the guiding wheels.

[0029] Preferably, the driving frame includes a top plate and driving plates located on both sides of the top plate. The two driving plates are simultaneously located on both sides of the sliding sleeve, and the guiding groove is formed on the driving plates.

[0030] Preferably, a guiding plate for guiding the lifting movement of the driving frame is provided on the base.

[0031] Preferably, it further includes a pressing plate assembly provided on the driving frame. The pressing plate assembly includes a pressing plate group and rollers;

[0032] There is a U-shaped positioning opening with a downward opening on the pressing plate group. When the pressing plate assembly moves downward, the U-shaped positioning opening can be clamped onto the pipe;

[0033] There are multiple rollers, arranged along the edge position of the U-shaped positioning opening. A partial rolling surface of each roller is located in the U-shaped positioning opening and contacts the pipe;

[0034] When the pipe is at the highest position of the U-shaped positioning opening, the guiding wheel is located in the upper section.

[0035] The advantages of the present invention are:

[0036] 1. When the pipe passes through the hollow shaft, the locking sleeve remains in its initial position. The loosening inner guiding surface on the push plate abuts against the loosening outer guiding surface on the clamping plate, keeping the clamping plate away from the center line of the hollow shaft. Therefore, the pipe will not come into contact with the clamping plate, avoiding the problem of scratching the surface of the pipe. At the same time, it can also reduce the thrust required for the pusher trolley in the pipe feeding mechanism. After the pipe feeding is completed, the locking sleeve driving component drives the locking sleeve to move towards the outlet end side of the hollow shaft. The locking sleeve presses the clamping plate towards the center line of the hollow shaft, causing the inner surfaces of multiple clamping plates to simultaneously press against the outer surface of the pipe to clamp the pipe, thereby realizing the rotational feeding of the pipe.

[0037] 2. The clamping plates are floatingly arranged in the installation openings on the side wall of the hollow shaft, making the length of the clamping plates coincide with the axial length of the hollow shaft, which will not affect the length of the entire device and will not affect the use of the locking device either. Secondly, the floating structure occupies relatively less space when operating in the installation opening. Therefore, the length of the clamping plates can be increased, which can improve the stability of clamping the pipe, especially for pipes with a larger diameter.

[0038] 3. The U-shaped positioning opening of the pressing plate assembly is stuck on the pipe, which can position the pipe. When the pipe is cold rolled, the crosstalk generated by the pipe is first transmitted to the pressing plate assembly, and most of the force is buffered by the pressing plate assembly and the oil cylinder. Brief Description of the Drawings

[0039] Figure 1 It is a cross-sectional view of the feeding and locking device of the feeding trolley of the cold rolling tube mill provided in this embodiment;

[0040] Figure 2 It is a front view of the feeding and locking device of the feeding trolley of the cold rolling tube mill provided in this embodiment;

[0041] Figure 3 It is a cross-sectional view of the cooperation between the locking sleeve and the clamping plate provided in this embodiment;

[0042] Figure 4 It is an exploded view of the hollow shaft, clamping plate, locking sleeve and connecting sleeve provided in this embodiment;

[0043] Figure 5 It is a front view of the pressing plate assembly provided in this embodiment;

[0044] Figure 6 It is a schematic diagram of the driving plate provided in this embodiment;

[0045] Figure 7 It is a cross-sectional view of the cooperation structure between the locking sleeve, connecting sleeve, mounting ring, thrust bearing, sliding ring and guide sleeve provided in this embodiment.

[0046] Description of the Reference Numerals:

[0047] 1. Machine case;

[0048] 2. Bearing;

[0049] 3. Hollow shaft; 31. Inlet end; 32. Outlet end; 33. Connecting flange; 35. Accommodating groove; 36. Installation opening;

[0050] 4. Clamping plate; 40. Outer step; 401. Locking outer plane; 41. Outer guiding surface; 411. Clamping outer guiding surface; 412. Loosening outer guiding surface;

[0051] 5. Locking sleeve; 50. Inner step; 501. Locking inner plane; 51. Inner guiding surface; 511. Clamping inner guiding surface; 512. Loosening inner guiding surface;

[0052] 6. Locking sleeve driving assembly; 61. Oil cylinder; 62. Driving frame; 622. Driving plate; 623. Top plate; 621. Guiding groove; 6211. Upper section; 6212. Lower section; 6213. Lower groove wall; 6214. Upper groove wall; 63. Guiding sleeve; 64. Sliding sleeve; 641. Guide wheel; 65. Thrust bearing; 66. Installation ring; 67. Connecting sleeve; 671. Connecting section; 672. Extension piece; 673. Connecting section;

[0053] 7. Base; 71. Guiding plate; 72. Installation hole;

[0054] 8. Pressing plate assembly; 81. Pressing plate; 82. Roller; 83. U-shaped positioning opening; 831. Partial rolling surface;

[0055] 9. Pushing plate;

[0056] 10. Pipe. Detailed implementation mode

[0057] Combined with Figures 1 to 7 A further description is made for the feeding and locking device of the feeding trolley of the cold rolling tube mill of the present invention.

[0058] A feeding and locking device for the feeding trolley of a cold rolling tube mill includes a machine case 1 and a hollow shaft 3 rotatably arranged in the machine case 1 through a plurality of bearings 2. It is characterized in that: it further includes a clamping plate 4, a locking sleeve 5 and a locking sleeve driving assembly 6.

[0059] At least two installation openings 36 are formed in the circumferential side wall of the hollow shaft 3 along the circumferential direction. In this embodiment, three uniformly distributed installation openings 36 are formed.

[0060] The number of the clamping plates 4 is the same as that of the mounting openings 36, which is three. They are respectively installed in the three mounting openings and can move radially along the hollow shaft 3. The clamping plate 4 has an arc structure, and the center line of the clamping plate 4 is parallel to the center line of the hollow shaft 3. After the three clamping plates 4 all move towards the center line direction of the hollow shaft 3, the inner surfaces of the three clamping plates 4 can form a clamping channel to clamp the pipe 10. An outer guiding surface 41 is provided on the outer side wall of the clamping plate 4.

[0061] The locking sleeve 5 is sleeved on the hollow shaft 3. A guiding groove extending axially and a guiding pin fitted in the guiding groove are provided between the inner wall of the locking sleeve 5 and the outer wall of the hollow shaft 3. Therefore, the locking sleeve 5 can move axially relative to the hollow shaft 3 and cannot rotate circumferentially relative to the hollow shaft 3. An inner guiding surface 51 is provided on the inner wall of the locking sleeve 5. When the locking sleeve 5 moves relative to the hollow shaft 3, the outer guiding surface 41 cooperates with the inner guiding surface 51 to drive the three clamping plates 4 to move towards or away from the center line of the hollow shaft 3 simultaneously, so as to clamp or release the pipe 10.

[0062] The locking sleeve driving assembly 6 is connected to the locking sleeve 5 to drive the locking sleeve 5 to move relative to the hollow shaft 3.

[0063] As Figure 3 、 4 shown, the outer guiding surface 41 is divided into a clamping outer guiding surface 411 and a releasing outer guiding surface 412, and the inner guiding surface 51 is divided into a clamping inner guiding surface 511 and a releasing inner guiding surface 512. When the locking sleeve 5 moves towards the outlet end 32 of the hollow shaft 3, that is, moves left as shown in Figure 3 shown, the clamping outer guiding surface 411 cooperates with the clamping inner guiding surface 511 to press the clamping plate 4 towards the center line of the hollow shaft 3; when the locking sleeve 5 moves towards the inlet end 31 of the hollow shaft 3, that is, moves right as shown in Figure 3 shown, the releasing inner guiding surface 512 cooperates with the releasing outer guiding surface 412 to push the clamping plate 4 away from the center line of the hollow shaft 3.

[0064] On the outer side wall of the clamping plate 4, there is an outer step 40 protruding from the outer side wall of the clamping plate 4. In this embodiment, there are two outer steps 40, arranged along the axial direction of the clamping plate 4. One end of the outer step facing the inlet end 31 of the hollow shaft 3 is an inclined clamping outer guiding surface 411, and the top surface of the outer step is a flat surface, which is the locking outer flat surface 401. On the inner side wall of the lock sleeve 5, there is an inner step 50 protruding from the inner side wall of the lock sleeve 5. Correspondingly, there are also two inner steps 50. One end of the inner step 50 facing the outlet end 32 of the hollow shaft 3 is an inclined clamping inner guiding surface 511, and the top surface of this inner step 50 is also a flat surface, which is the locking inner flat surface 501. When the lock sleeve 5 moves towards the outlet end 32 of the hollow shaft 3, the clamping inner guiding surface 511 presses down the clamping outer guiding surface 411 to make the clamping plate 4 move towards the center line of the hollow shaft 3. Finally, the locking inner flat surface 501 of the inner step 50 presses against the locking outer flat surface 401 of the outer step to achieve stable positioning.

[0065] The outer step 40 corresponding to the inlet end 31 side of the hollow shaft 3, one end of this outer step corresponding to the outlet end 32 of the hollow shaft 3 is an inclined releasing outer guiding surface 412. A push plate 9 is connected to the inner wall of the lock sleeve 5. One end of the push plate 9 facing the inlet end 31 of the hollow shaft 3 is an inclined releasing inner guiding surface 512. When the lock sleeve 5 moves towards the inlet end 31 side of the hollow shaft 3, the releasing inner guiding surface 512 abuts against the releasing outer guiding surface 412 to make the clamping plate 4 move away from the center line of the hollow shaft 3.

[0066] There are three push plates 9, corresponding to and cooperating with the releasing outer guiding surfaces 412 on the three clamping plates 4 respectively.

[0067] The push plate 9 is of an L-shaped structure. The bottom plate of the push plate 9 is fixed to the end surface of the inner step 50 facing the inlet end 31 of the hollow shaft 3 by bolts or welding.

[0068] As Figure 1 、 7 shown, in the structure of the lock sleeve driving assembly 6, it includes a connecting sleeve 67, a guiding sleeve 63, a sliding sleeve 64, an installation ring 66, a driving frame 62 and a driving component.

[0069] A base 7 is bolted to the side of the chassis 1 corresponding to the outlet end 32 of the hollow shaft 3. The base 7 has a waist-shaped mounting hole 72. The guide sleeve 63 is bolted to the base 7 near the bottom of the mounting hole 72 and corresponds to the outlet end 32 of the hollow shaft 3. The sliding sleeve 64 fits within the guide sleeve 63 with circumferential restraint and axial movement. The end of the sliding sleeve 64 facing away from the hollow shaft 3 is located outside the guide sleeve 63, and guide wheels 641 are provided on either side of this end. A keyway structure is provided between the outer wall of the sliding sleeve 64 and the inner wall of the guide sleeve 63, allowing axial movement and circumferential restraint within the guide sleeve 63. The mounting ring 66 is mounted within the sliding sleeve 64 with axial restraint and circumferential rotation. Specifically, the mounting ring 66 is mounted within the sliding sleeve 64 via a thrust bearing 65. One end of the connecting sleeve 67 is connected to the locking sleeve 5, and the other end is connected to the mounting ring 66. The driving component is a cylinder 61, which is installed in an inverted state on the top of the base 7. The driving frame 62 is connected to the piston rod of the cylinder 61 and has a guide groove 621 that cooperates with two guide wheels 641. When the cylinder 61 drives the driving frame 62 to move up and down, the guide groove 621 cooperates with the guide wheel 641 to drive the connecting sleeve 67 to move axially along the hollow shaft 3, thereby driving the locking sleeve 5 to move axially.

[0070] like Figure 4 As shown, the connecting sleeve 67 is made of steel material and has a connecting section 671 and an extension section.

[0071] The diameter of the connecting section 671 is larger than the diameter of the extending section, and the connecting section 671 is threadedly connected to one end of the locking sleeve 5 facing the outlet end 32 of the hollow shaft 3 to facilitate assembly and disassembly.

[0072] The extension section extends to the outside of the outlet end 32 of the hollow shaft 3 and extends into the mounting ring 66 , and is connected to the inner wall of the mounting ring 66 by rivets, so that the mounting ring 66 , the connecting sleeve 67 and the locking sleeve 5 can move synchronously.

[0073] The extension section is formed by three circumferentially distributed extension pieces 672 formed at the ends of the connecting section 671. The extension pieces 672 are connected to the connecting section 671 by a connecting section 673 formed by bending the ends of the extension pieces 672. Correspondingly, the outer wall of the hollow shaft 3 has a receiving groove 35 for accommodating the extension pieces 672. The thickness of the extension piece 672 is less than the depth of the receiving groove 35, so that the top of the extension piece 672 does not protrude from the outer surface of the hollow shaft 3, thereby not interfering with the installation of the bearing 2 and the connecting flange 33.

[0074] like Figure 2As shown, in the structure of the driving frame 62, the driving frame 62 as a whole is a U-shaped structure with an opening downward, including a top plate 623 and driving plates 622 located on both sides of the top plate 623. The top of the top plate 623 is connected to the piston rod of the oil cylinder 61. The two driving plates 622 are located on both sides of the sliding sleeve 64. The guiding groove 621 is formed on the driving plate 622 for the guiding wheels 641 on both sides of the guiding sleeve 63 to pass through and be guided.

[0075] As Figure 1 , 6 As shown, the guiding groove 621 is divided into an upper section 6211 and a lower section 6212 that are vertically connected. The upper section 6211 is vertically arranged for a transitional function, and the lower section 6212 is inclined for a guiding function. The lower section 6212 drives the sliding sleeve 64, the connecting sleeve 67, and the locking sleeve 5 by cooperating with the guiding wheels 641.

[0076] The outer guiding surface 41, the inner guiding surface 51, and the lower section 6212 have the same inclination angle of 45°. In actual use, this angle can also be set according to requirements. During the tightening process, the driving plate 622 moves downward, causing the guiding wheels 641 to move to the highest point of the lower section 6212 or into the upper section 6211 under the guiding of the groove wall 6214 of the lower section 6212. At the same time, the tightening inner guiding surface 511 of the tightening plate 4 completely passes through the tightening outer guiding surface 411, and the locking inner plane 501 of the inner step 50 presses against the locking outer plane 401 of the outer step 40, keeping the three tightening plates 4 in a tightened state. During the loosening process, the driving plate 622 moves upward, causing the guiding wheels 641 to move to the lowest point of the lower section 6212 under the guiding of the lower groove wall 6213 of the lower section 6212. At the same time, the loosening inner guiding surface 512 on the push plate 9 also moves from the high point to the low point of the loosening outer guiding surface 412, pushing up the tightening plates 4 and keeping the tightening plates 4 in the loosened state.

[0077] As Figure 2 As shown, on the base 7, there are guiding plates 71 for guiding the lifting and moving of the driving frame 62. There are two guiding plates 71, which are respectively located outside the two driving plates 622 for the outer side walls of the driving plates 622 to abut against and be guided, so as to improve the stability of the up and down movement of the driving plate 622 and the stability of driving the guiding sleeve 63, the connecting sleeve 67, and the locking sleeve 5.

[0078] On the side of the guiding plate 71 facing the driving plate 622, there is a guiding groove for the cooperation of the driving plate.

[0079] As Figure 1 , 2 As shown in Figures 5, etc., this locking device further includes a pressing plate assembly 8 provided on the driving frame 62. The pressing plate assembly 8 includes a pressing plate group and rollers 82.

[0080] The pressing plate group is provided with a U-shaped positioning opening 83 with an opening facing downwards. When the pressing plate assembly 8 moves downwards, the U-shaped positioning opening 83 can be clamped onto the pipe 10 to limit the pipe 10 in multiple directions and reduce the situation of the pipe 10 moving longitudinally. There are multiple rollers 82 arranged along the edge position of the U-shaped positioning opening 83. A partial rolling surface 831 of each roller 82 is located in the U-shaped positioning opening 83 to avoid the problem of the pipe 10 being scratched due to direct contact with the pressing plate group.

[0081] The pressing plate group includes two front and rear parallel pressing plates 81 connected and fixed by bolts. Edge plates are provided at the edge positions of the two pressing plates 81 to further position the two pressing plates 81. Both ends of each roller 82 are respectively inserted into the grooves on the inner side walls of the two pressing plates 81, so that the roller 82 is positioned between the two pressing plates 81. The pressing plate assembly 8 is located between the hollow shaft 3 and the cold rolling mill. The U-shaped positioning opening 83 on the pressing plate assembly 8 is clamped onto the pipe 10. Cooperating with the rollers on the feeding conveyor bed can limit the pipe 10 in all directions, that is, it can limit or reduce the situation of the pipe 10 moving longitudinally upwards or moving left and right. At the same time, the force borne by the pressing plate assembly 8 can be buffered by the oil cylinder 61, so that the clamping plate 4 on the hollow shaft 3 can firmly clamp the pipe 10.

[0082] When the pipe 10 is at the highest position of the U-shaped positioning opening 83, the guide wheel 641 is located in the upper section 6211, which is convenient for the adaptive adjustment of the guide wheel 641 in the upper section 6211.

[0083] During the specific use process, in the initial state, the oil cylinder 61 drives the driving plate 622 to remain in the upward movement state, so that the guide wheel 641 is located at the lowest point of the lower section 6212 of the guide groove 621. The loosening inner guide surface 512 abuts against the lowest point of the loosening outer guide surface 412. The clamping plate 4 remains at a position away from the center line of the hollow shaft 3, that is, the clamping opening is in an open state. In this state, when the pipe 10 passes through, it will not contact the inner surface of the clamping plate 4, avoiding the problem of the surface of the pipe 10 being worn and also reducing the thrust required for the loading trolley in the loading mechanism;

[0084] After the loading is completed, the oil cylinder 61 drives the driving plate 622 to move downwards, so that the guide wheel 641 moves from the lower section 6212 to the upper section 6211. During this process, the sliding sleeve 64 moves towards the side away from the hollow shaft 3, and at the same time pulls the mounting ring 66, the connecting sleeve 67, and the locking sleeve 5. The clamping plate 4 moves towards the center of the hollow shaft 3 under the cooperation of the clamping inner guide surface 511 and the clamping outer guide surface 411, realizing the clamping of the clamping opening and clamping the pipe 10.

[0085] Meanwhile, the pressing plate assembly 8 descends synchronously with the driving frame 62. The U-shaped positioning port 83 on the pressing plate assembly 8 is engaged with the pipe 10 to limit the pipe 10 in multiple directions, avoiding or reducing the crosstalk amplitude of the pipe 10 during the cold rolling process, improving the stability of the clamping plate 4 in clamping the pipe 10, and the stability of the whole trolley in feeding the pipe 10.

[0086] After the feeding is completed, the oil cylinder 61 moves upward to drive the clamping plate 4 to reset, and the next cycle of operation can be carried out.

[0087] The above is only the preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions falling within the idea of the present invention belong to the protection scope of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A feeding and locking device for a feeding trolley of a cold rolling tube mill, comprising a machine box (1) and a hollow shaft (3) rotatably arranged in the machine box (1), characterized in that: It further includes a clamping plate (4), a locking sleeve (5) and a locking sleeve driving assembly (6); The hollow shaft (3) is provided with at least two mounting openings (36) on its side wall in the circumferential direction; The number of the clamping plates (4) is the same as that of the mounting openings (36), and they are respectively installed in the respective mounting openings (36), and can move radially along the hollow shaft (3). An outer guiding surface (41) is provided on the outer side wall of the clamping plate (4); The locking sleeve (5) is sleeved on the hollow shaft (3) and can axially move relative to the hollow shaft (3). An inner guiding surface (51) is provided on the inner wall of the locking sleeve (5). When the locking sleeve (5) moves relative to the hollow shaft (3), the outer guiding surface (41) cooperates with the inner guiding surface (51) to drive multiple clamping plates (4) to move simultaneously towards or away from the center line of the hollow shaft (3) to clamp or loosen the pipe (10); The locking sleeve driving assembly (6) is connected to the locking sleeve (5) to drive the locking sleeve (5) to move relative to the hollow shaft (3); The locking sleeve driving assembly (6) includes a connecting sleeve (67), a guiding sleeve (63), a sliding sleeve (64), a mounting ring (66), a driving frame (62) and a driving component; A base (7) is provided on one side of the chassis (1) corresponding to the outlet end (32) of the hollow shaft (3). The guiding sleeve (63) is installed on the base (7) and corresponds to the outlet end (32) of the hollow shaft (3); The sliding sleeve (64) is circumferentially limited and axially movable and is fitted in the guiding sleeve (63), and guiding wheels (641) are provided on the left and right sides of the guiding sleeve (63); The mounting ring (66) is axially limited and circumferentially rotatable and is installed in the sliding sleeve (64); One end of the connecting sleeve (67) is connected to the locking sleeve (5), and the other end is connected to the mounting ring (66); The driving component is installed on the base (7). The driving frame (62) is connected to the driving component and has a guiding groove (621) that cooperates with the two guiding wheels (641). When the driving component drives the driving frame (62) to move up and down, the guiding groove (621) cooperates with the guiding wheels (641) to drive the connecting sleeve (67) to move axially along the hollow shaft (3).

2. The feeding and locking device of the feeding trolley of the cold rolling tube mill according to claim 1, characterized in that: The outer guiding surface (41) is divided into a clamping outer guiding surface (411) and a loosening outer guiding surface (412), and the inner guiding surface (51) is divided into a clamping inner guiding surface (511) and a loosening inner guiding surface (512); During movement, the clamping outer guiding surface (411) cooperates with the clamping inner guiding surface (511) to press the clamping plate (4) towards the center line of the hollow shaft (3), and the loosening inner guiding surface (512) cooperates with the loosening outer guiding surface (412) to push the clamping plate (4) away from the center line of the hollow shaft (3).

3. The feeding and locking device of the feeding trolley of the cold rolling tube mill according to claim 2, characterized in that: On the outer side wall of the clamping plate (4), there is an outer step (40). One end of the outer step facing the inlet end (31) of the hollow shaft (3) is an inclined clamping outer guiding surface (411). On the inner side wall of the locking sleeve (5), there is an inner step (50). One end of the inner step (50) facing the outlet end (32) of the hollow shaft (3) is an inclined clamping inner guiding surface (511). When the locking sleeve (5) moves towards the side of the outlet end (32) of the hollow shaft (3), the clamping inner guiding surface (511) presses down the clamping outer guiding surface (411) to make the clamping plate (4) move towards the center line of the hollow shaft (3).

4. The feeding and locking device of the feeding trolley of the cold rolling tube mill according to claim 3, characterized in that: One end of the outer step corresponding to the outlet end (32) of the hollow shaft (3) is an inclined releasing outer guiding surface (412). A pushing plate (9) is connected to the inner wall of the locking sleeve (5). One side of the pushing plate (9) facing the inlet end (31) of the hollow shaft (3) is an inclined releasing inner guiding surface (512). When the locking sleeve (5) moves towards the side of the inlet end (31) of the hollow shaft (3), the releasing inner guiding surface (512) abuts against the releasing outer guiding surface (412) to make the clamping plate (4) move away from the center line of the hollow shaft (3).

5. The feeding and locking device of the feeding trolley of the cold rolling tube mill according to claim 1, characterized in that: The connecting sleeve (67) has a connecting section (671) and an extending section; The diameter of the connecting section (671) is larger than that of the extending section, and the connecting section (671) is in threaded fit connection with the locking sleeve (5); The extending section extends to the outside of the outlet end (32) of the hollow shaft (3) and is connected to the mounting ring (66); The extending section is formed by a plurality of extending pieces (672) distributed in a circumferential manner at the end of the connecting section (671). On the outer side wall of the hollow shaft (3), there is a receiving groove (35) for receiving the extending pieces (672).

6. The feeding and locking device of the feeding trolley of the cold rolling tube mill according to claim 1, characterized in that: The guiding groove (621) is divided into an upper section (6211) and a lower section (6212). The upper section (6211) is vertically arranged, and the lower section (6212) is inclined. It drives the connecting sleeve (67) to move through cooperation with the guiding wheel (641).

7. The feeding and locking device of the feeding trolley of the cold rolling tube mill according to claim 1, characterized in that: The driving frame (62) includes a top plate (623) and driving plates (622) located on both sides of the top plate (623). The two driving plates (622) are simultaneously located on both sides of the sliding sleeve (64), and the guiding groove (621) is opened on the driving plates (622).

8. The feeding and locking device of the feeding trolley of the cold rolling tube mill according to claim 1, wherein: On the base (7), there is a guiding plate (71) for guiding the lifting and moving of the driving frame (62).

9. The feeding and locking device of the feeding trolley of the cold rolling tube mill according to claim 1, characterized in that: It further includes a pressing plate assembly (8) arranged on the driving frame (62). The pressing plate assembly (8) includes a pressing plate group and rollers (82); On the pressing plate group, there is a U-shaped positioning opening (83) with an opening downward. When the pressing plate assembly (8) moves downward, the U-shaped positioning opening (83) can be clamped onto the pipe (10); There are a plurality of the rollers (82), which are arranged along the edge position of the U-shaped positioning opening (83). A partial rolling surface of each roller (82) is located in the U-shaped positioning opening (83) and contacts the pipe (10); When the pipe (10) is at the highest position of the U-shaped positioning opening (83), the guiding wheel (641) is located in the upper section (6211).

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