Rocker arm frame device for feeding slewing mechanism of seamless steel tube cold-rolling mill

Abstract

The utility model discloses a rocker arm frame device for a feeding slewing mechanism of a seamless steel tube cold-rolling mill. The rocker arm frame device comprises a rocker arm frame and a rocker arm crank throw, the frame body is defined by a front end plate, a rear end plate and two side plates, a concave portion is arranged in the middle of the frame body, a first pin shaft and a second pin shaft are arranged on the two sides of the concave portion, the two side plates serve as the first side plate and the second side plate, the two ends of the two pin shafts are located on the two side plates respectively, the first pin shaft is close to the side of the front end plate, and a first through hole is formed in the front end plate. The rocker crank consists of two clamping plates and a connecting plate for connecting the two clamping plates; the inner side distance of the two clamping plates is greater than the outer side width of the two side plates; the two clamping plates are clamped outside the two side plates and connected through a first pin shaft, the connecting plate is located on the outer side of the front end plate, and a second through hole corresponding to the first through hole is formed in the connecting plate; a bolt is further included, the head of the bolt is limited to the inner side end of the front end plate, a bolt rod body is inserted from the first through hole and extends out of the connecting plate after passing through the second through hole, a stop piece is arranged on the extending section, and a compression spring is arranged on the bolt rod body between the stop piece and the second through hole.

Description

Technical Field

[0001] The utility model relates to a rocker arm frame device for a feed and rotation mechanism of a seamless steel tube cold rolling mill, belonging to the technical field of cold rolling production equipment for producing seamless steel tubes in the metallurgical and mechanical industries, and is particularly applicable to the connection between a swing crankshaft system and a feed shaft system that provides intermittent motion equivalent by a roller overrunning clutch in the feed and rotation mechanism. Background Technique

[0002] Seamless steel tubes are common metallurgical products.

[0003] At present, cold rolling deformation processing is the main method for cold deformation processing of seamless steel tubes. The two-roll periodic cold rolling mill is the main cold rolling production equipment for seamless steel tubes. Usually, the two-roll cold rolling mill consists of a feed and rotation mechanism, a rolling mechanism, a transmission mechanism, a rotary chuck mechanism, a bed body mechanism, a feeding (lower) mechanism, a lubrication mechanism, a hydraulic mechanism, an electrical control system, etc. For the feed and rotation mechanism, a box-type structure is adopted, and a complete shaft system is composed of devices such as a feed, a rotation, an intermediate gear, a cam, and a swing crank. The rotational motion output by the main motor is converted into a horizontal feed motion and a synchronous rotational motion output by the feed and rotation mechanism, thereby driving the seamless steel tube to complete a horizontal motion and a synchronous rotational motion in the rolling mechanism. Therefore, the motion accuracy of the feed and rotation mechanism directly affects the rolling accuracy and efficiency of seamless steel tubes.

[0004] At present, the feed and rotation mechanism of the two-roll periodic cold rolling mill is mainly composed of two shaft systems: a multi-cam and a single-cam. Among them, the multi-cam form is to adopt a feed cam and a rotation cam structure respectively, and the adjustment of the feed equivalent is realized through the combination of a worm gear pair. The single-cam form is to have only a feed cam, and the adjustment of the feed equivalent is realized through the combination of a swing crank and an overrunning clutch. Since the single-cam structure is relatively simple, the volume of the box is smaller than that of the multi-cam structure, and the daily use and maintenance are convenient, it is widely used in the field where the finished product specification diameter ≤ 110mm.

[0005] The feed and rotation mechanism of the single-cam form adopts a single-layer box-type structure and is composed of 6 sets of main shafts (systems) and 2 sets of auxiliary shafts (systems) (as shown in the appendix Figure 1 ). In terms of structure, they are 6 sets of main shafts (systems) such as a swing crankshaft 101, a cam rotating shaft 102, a rotating shaft 103, a feed shaft 104, an intermediate gear shaft 105, and a connecting shaft 106 in sequence. On both sides of the connecting shaft 106 are 2 sets of connecting pin shafts (auxiliary shaft systems). Among them, roller overrunning clutches are arranged at the ends of the swing crankshaft 101, the rotating shaft 103, and the feed shaft 104, and the swing crankshaft (system) and the feed shaft (system) are connected by a relay connecting rod 107 outside the box. The swing crankshaft 101, the rotating shaft 103, and the cam rotating shaft 102 are connected by a rocker (frame) of the box 100 (i.e., the rocker arm frame device 108 in the figure).

[0006] During seamless steel pipe rolling, the rotational motion output by the main motor is transmitted to the feed rotary mechanism through a connecting shaft, and then sequentially transmitted to other shafts through gear meshing, that is:

[0007] 1) The rotational motion is transmitted to the feed shaft system through the gear meshing between the connecting shaft system and the intermediate gear shaft system, and the feed shaft system drives the end overrunning clutch to output the feed amount (this feed amount is not the directly output rolling feed equivalent).

[0008] 2) The feed shaft system transmits the rotational motion to the rotating shaft system through gear meshing, and through the combination of the rocker (frame) and the roller (short cylindrical roller bearing) installed between the rotating shaft system and the swing crank shaft system, the rotational motion is converted into the fitting friction between the roller (short cylindrical roller bearing) and the cam rotating shaft, and the intermittent motion transmitted to the end overrunning clutch is driven and controlled by this frictional force, and the synchronous rotation equivalent is output.

[0009] 3) At the same time as the second step mentioned above, the feed shaft system transmits power to the swing crank shaft system through the rocker (frame). At this time, the relay connecting rod 107 of the outer swing of the tail of the feed shaft system outside the box transmits the feed amount output by the end overrunning clutch of the feed shaft to the outer swing of the swing crank shaft system outside the box, driving the end overrunning clutch of the swing crank shaft system to move and output the feed equivalent for rolling; and the swing amplitude of the relay connecting rod can be adjusted by the up and down movement of the movable pin installed in the dovetail groove of the outer swing, realizing the adjustment and correction function of the feed equivalent. The outer swing 109 of the feed shaft, the swing crank 110, the connecting rod 111 and the feed rotary gear mechanism 112 are also shown in the figure.

[0010] It can be seen that the rocker (frame) device arranged inside the feed rotary gear box is the only structural component connecting the four shaft systems of the swing crank, rotation, feed, and cam in the entire feed rotary mechanism. During seamless steel pipe rolling, not only the horizontal feed motion generated and output by the relevant shaft systems needs to be controlled, but also the synchronous rotation motion generated and output by the relevant shaft systems needs to be controlled. Therefore, its operating state directly affects the motion accuracy and stability of the entire feed rotary mechanism.

[0011] At present, the rocker (frame) device used in two-high periodic seamless steel tube cold rolling mills of models such as LG-110H mainly consists of components such as rocker (frame), rocker crank, spring bolt, compression spring, spring retaining ring, round nut, lock washer, and bushing. Through the combination of the two cylindrical holes, pins, pressure plates and other components at the front and back of the rocker (frame), they are respectively connected to the built-in swing cranks of the swing crank and the rotating shaft system, and inclusively cover the outer surface of the cam of the cam shaft system. The intermittent motion conversion and output are realized by the contact motion of the two sets of rollers (short cylindrical roller bearings) installed on the inner rockers of the feed and rotating shaft systems on the cam surface. The main problems at present are:

[0012] 1) The rocker (frame) is prone to deformation and cracking: This is mainly caused by the impact load during rolling. The impact load stems from the movement clearance between the cam and the roller (short cylindrical roller bearing). The reasons are that the initial clearance between the cam and the roller (short cylindrical roller bearing) is not adjusted properly during the on-line installation of the rocker (frame), and the wear caused by the long-term use of the contact surface between the cam and the roller. At the same time, it is closely related to the steel type, deformation amount, etc. during cold rolling of the pipe. In short, the rocker (frame) lacks a shock-absorbing structure.

[0013] 2) The roller (short cylindrical roller bearing) is prone to escape and breakage: There are two structures for the roller. One is that a steel cylindrical ring is directionally assembled outside the short cylindrical roller bearing, and the main problem is the escape of the external cylindrical ring; the other directly uses a rolling bearing without setting an external cylindrical ring, and the main problem is the breakage and fragmentation of the bearing. The reasons for the above two problems are mainly that there is an impact phenomenon when the surface of the roller (short cylindrical roller bearing) contacts the cam, especially when the cam transitions from a flat surface to a curved surface, and instantaneous impact is likely to occur. The reasons are that the initial pre-tightening force of the end spring (compression spring) is not in place and the round nut is loose. At the same time, it is related to the improper adjustment of the initial clearance during on-line installation.

[0014] At present, the above two problems are one of the main fault points in the operation of the feed and rotation mechanism of this equipment. They are disposed of by means of shutdown maintenance. The shutdown disposal is time-consuming and laborious, and it takes 48 hours to shut down. At the same time, when the roller (short cylindrical roller bearing) escapes and breaks, it will cause irreversible damage to the surface of the cam, which is not conducive to the subsequent operation of the equipment. With the enterprise adapting to market demands, the research and production of seamless steel pipes of high-alloy element and high-strength (such as nickel-based alloys, duplex stainless steels, etc.) steel types, the operation failures of the rocker (frame) device show an obvious upward trend.

[0015] To sum up, at present, the rocker arm device of the feed and rotation mechanism of the seamless steel pipe cold rolling mill cannot meet the accuracy and stability requirements during the cold rolling of seamless steel pipes of high-alloy element and high-strength (such as nickel-based alloys, duplex stainless steels, etc.) steel types. The failure shutdown rate increases, and the daily equipment maintenance workload is large. Therefore, corresponding technical improvements need to be implemented to optimize the structural strength of the rocker (frame) device, enhance the anti-deformation ability under impact load conditions, and create conditions for improving the initial clearance accuracy during on-line installation, ensure the operation accuracy and stability of the entire feed and rotation mechanism, meet the needs of the orderly production of high-alloy element and high-strength seamless steel pipes, reduce the equipment maintenance cost and failure shutdown time, and further enhance the core competitiveness of the enterprise in the market. Utility Model Content

[0016] The technical problem to be solved by the present utility model is to overcome the above deficiencies of the prior art and provide a rocker arm device for the feed and rotation mechanism of a seamless steel pipe cold rolling mill that can effectively improve the operation accuracy and stability of the rocker arm device.

[0017] The technical problem to be solved can be implemented by the following technical solutions.

[0018] A rocker arm frame device for a feed rotary mechanism of a seamless steel tube cold rolling mill, characterized in that it includes a rocker arm frame (201) and a rocker arm crank (202);

[0019] The frame body of the rocker arm frame (201) is enclosed by a front end plate (302) at the front, a rear end plate (303) at the rear, and two parallel side plates (304) on both sides. An inwardly recessed concave portion (309) is provided in the middle section of the frame body of the rocker arm frame (201). A first pin shaft (211) and a second pin shaft (210) are provided on opposite sides of the concave portion (309). Taking the two side plates (304) on both sides as the first side plate and the second side plate respectively, both ends of the first pin shaft (211) and the second pin shaft (210) are positioned on the first side plate and the second side plate respectively. The first pin shaft (211) is located on the side close to the front end plate (302), and a first through hole (301) is provided on the front end plate (302);

[0020] The rocker arm crank (202) is composed of two parallel clamping plates (402) and a connecting plate (401) connecting the two clamping plates. The distance between the inner sides of the two clamping plates (402) is greater than the width between the outer sides of the two side plates (304); the two clamping plates are clamped outside the two side plates and connected by the first pin shaft (211). The connecting plate (401) is located outside the front end plate (302), and a second through hole (403) corresponding to the first through hole (301) is provided on the connecting plate (401);

[0021] It further includes a bolt (205). The head of the bolt (205) is limited to the inner end of the front end plate (302). The bolt rod body is inserted through the first through hole (301) and extends out of the connecting plate (401) after passing through the second through hole (403). A stop member is provided on the extending section. A compression spring (206) is sleeved on the bolt rod body between the stop member and the second through hole (403).

[0022] Furthermore, an arm frame slider (203) is padded between each clamping plate (402) of the rocker arm crank (202) and the corresponding side plate (304). The arm frame slider (203) is sleeved on the first pin shaft (211) in the form of a bushing.

[0023] Preferably, the arm frame slider is integrally in a stepped shape. The stepped structure is composed of a column (504) and a shoulder (503). A sleeve hole penetrating the first pin shaft (211) is provided on the column (504); the shoulder (503) is padded between the clamping plate (402) and the side plate (304).

[0024] Preferably, an adjusting gasket (204) is provided between the side plate (304) and the clamping plate (402), and the adjusting gasket is sleeved on the first pin shaft (211).

[0025] Preferably, the first through hole (301) and the second through hole (403) are coaxial holes.

[0026] Preferably, the stop member is a nut (208) threadedly fixed to the end of the bolt (205).

[0027] Preferably, a check washer (209) is provided between the stop member and the compression spring (206), and two ends of the compression spring respectively abut against the outer end face of the connecting plate (401) and the check washer (209).

[0028] Furthermore, the concave surface of the concave portion (309) includes a straight surface (310) and a curved surface (311) connected to the straight surface.

[0029] Furthermore, at the side plate of the rocker arm frame corresponding to the concave portion (309), an outwardly protruding outer convex trapezoid (308) is provided along the plane of the side plate.

[0030] Preferably, grooves (1101) perpendicular to the axial direction are respectively formed at two ends of the shaft body of the first pin shaft (211), and a pin shaft pressing plate (212) is embedded in each groove, and the pin shaft pressing plate (212) is fixedly connected to the clamping plate (402) of the rocker arm crank on the corresponding side through a fastener.

[0031] The rocker arm frame device adopting the above technical solution has the following advantages and beneficial effects:

[0032] 1. Reasonable design, compact structure, accurate positioning, vibration resistance, impact resistance, strong load-bearing capacity, safe and reliable, practical and efficient, less investment and low cost, effectively improving the operation precision and stability of the rocker arm frame device;

[0033] 2. The rocker arm frame is externally arranged across and covers the upper part of the cam, making full use of the space inside the box body, with a compact structure and easy installation;

[0034] 3. The end pin shaft penetrates through the cylindrical hole of the rocker arm frame, and is internally connected with the pendulum crank through the short cylindrical roller bearing after installation, and is locked by the two-way pressing plate fastener, with good stability;

[0035] 4. A rectangular hole is machined at the head of the rocker arm frame, and an arm frame slider is arranged. A cylindrical hole is machined on the plane of the slider for installing the pin shaft, which has an axial displacement function, can not only facilitate on-line installation and initial clearance adjustment, but also achieve shock absorption and vibration isolation during operation;

[0036] 5. After the rocker crank is connected to the spring bolt, the rocker crank, short cylindrical roller bearing and the cylindrical hole at the head end of the rocker (frame) are connected by a pin shaft and locked by a pressing plate fastener, which is easy to install and has good overall stability;

[0037] 6. The boom slider structure is adopted and combined with the compression spring in an orderly manner to achieve elastic contact in the conversion between the cam surface and the plane, effectively reducing the instantaneous impact phenomenon caused by factors such as large load and large clearance;

[0038] 7. Adjusting gaskets are arranged between the boom slider and the rocker crank, which has the function of correcting deviation, effectively correcting and compensating the lateral clearance, improving the accuracy during initial installation, reducing the offset of the rocker frame, and reducing the deformation of the rocker frame during operation;

[0039] 8. Through practical production applications, faults such as deformation and rupture of the rocker frame, damage of short cylindrical roller bearings, and escape of the outer ring of the roller are reduced from the source, meeting the requirements of cold rolling of high-alloy element and high-strength seamless steel pipes, and promoting the core competitiveness of the enterprise in the market;

[0040] 9. It has strong versatility and has certain reference and application value for the technical improvement of the feed and rotation mechanism of the seamless steel pipe cold rolling mill. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 is a schematic structural diagram of the feed and rotation mechanism of the seamless steel pipe cold rolling mill, where Figure 1 b is Figure 1 a view in the direction of A-A of a;

[0042] Figure 2 is a schematic structural diagram of the design of the present utility model; where Figure 2 a is the front view, Figure 2 b is the top view;

[0043] Figure 3 is a component diagram of the boom (frame); where, Figure 3 a is the front view, Figure 3 b is the top view;

[0044] Figure 4 is a part drawing of the rocker crank; where, Figure 4 b is Figure 4 the left view of a;

[0045] Figure 5 is a part drawing of the boom slider; where, Figure 5 b is Figure 5 the sectional view of a;

[0046] Figure 6 is a part drawing of the adjusting gasket; where, Figure 6 a is Figure 6 the sectional view of b;

[0047] Figure 7 is the part drawing of a compression spring; among which, Figure 7 a and Figure 7 b are the structural schematic diagrams from different perspectives;

[0048] Figure 8 is the part drawing of a spring pressing ring; among which, Figure 8 a is Figure 8 the sectional view of b;

[0049] Figure 9 is the part drawing of a round nut; among which, Figure 9 b is Figure 9 the sectional view of a;

[0050] Figure 10 is the part drawing of a bolt; among which, Figure 10 b is Figure 10 the sectional view of a;

[0051] Figure 11 is the part drawing of a pin shaft; among which, Figure 11 b is Figure 11 the left view of a, Figure 11 c is Figure 11 the top view of a;

[0052] Figure 12 is the part drawing of a pin shaft pressing plate; among which Figure 12 b is Figure 12 the left view of a;

[0053] Figure 13 is the schematic diagram of the working state of the device of the present utility model;

[0054] Figure 14 is Figure 13 the top view of. Specific embodiments

[0055] The following further elaborates on the specific embodiments of the present utility model in conjunction with the attached drawings.

[0056] Referring to Figures 2 to 14 , the present utility model provides a rocker arm frame device for the feed rotary mechanism of a seamless steel tube cold rolling mill, which is a technical improvement for the shafting connection structure components of the feed rotary mechanism of the existing two-roll periodic seamless steel tube cold rolling mill; adopting an integral structure, it is composed of a rocker arm frame 201, a rocker arm crank 202, an arm frame slider 203, an adjusting gasket 204, a bolt 205, a compression spring 206, a spring pressing ring 207, a nut 208, a lock washer 209, a first pin shaft 211, a second pin shaft 210, a pin shaft pressing plate 212, fasteners (bolt 213 and washer 214), etc.

[0057] Referring to Figure 3, there is 1 set of the rocker arm frame 201, which is composed of 1 front end plate 302, 1 rear end plate 303, and 2 side plates 304. The material is Q235A and it is formed by welding. The front end plate 302 is rectangular, and a first through hole 301 (circular stepped through hole) is vertically machined in the center of the plane. The small diameter of this stepped through hole matches the middle diameter section of the bolt 205 (refer to Figure 10 ), and an interference fit is preferably adopted, with an interference amount of 0.02 - 0.04 mm being appropriate. The large diameter of this stepped through hole matches the large diameter section of the bolt 205, and it is preferably larger than the large diameter of the bolt 205 by 3 - 5 mm. The rear end plate 303 is a rectangular flat plate. The side plate 304 is a special-shaped part. The two sides of the side plate are rectangular, the upper part in the middle is an outward convex trapezoid 308, and the lower part is an inward concave oblique circular arc (see the inward concave part 309 in the figure. This inward concave part 309 includes a straight surface 310 and a curved surface with natural transition. The inward concave part is located in the middle position between the two pin shafts). A circular through hole 305 is vertically machined on one rectangular plane of the side plate. The diameter of this circular through hole matches the outer diameter of the second pin shaft 210, and an interference fit is preferably adopted, with an interference amount of 0.02 - 0.04 mm being appropriate. Two threaded through holes 307 are vertically machined at equal distances inside this circular through hole. The diameter and hole pitch of the threaded through holes match the two round holes 1201 on the pin shaft pressing plate 212 (see Figure 12 ). A rectangular slot hole 306 is vertically machined on the other rectangular plane of the side plate. The length of the slot hole is preferably the length of the boom slider 203 + 60 - 80 mm. The width of the slot hole matches the width of the inner step of the boom slider 203, and a clearance fit is preferably adopted, with a clearance amount of 0.02 - 0.04 mm being appropriate. The four corners of the slot hole are machined into semi-circular process holes.

[0058] Refer to Figure 4 , there is 1 set of the rocker arm crank 202, which is composed of 1 connecting plate 401 and 2 clamping plates 402. The connecting plate is used to connect the clamping plates on both sides, and the clamping plates on both sides form the side plates. The material is Q235A and it is formed by welding. The connecting plate 401 is rectangular, and a second through hole 403 (circular stepped through hole) is vertically machined in the center of the plane. The diameter of this stepped through hole matches the small diameter section of the bolt 205, and a clearance fit is preferably adopted, with a clearance amount of 1 - 2 mm being appropriate. The clamping plate 402 is a rectangular flat plate. A circular through hole 404 is vertically machined on the rectangular plane near the outer side of the connecting plate. The diameter of the circular through hole matches the outer diameter of the first pin shaft 211, and an interference fit is preferably adopted, with an interference amount of 0.02 - 0.04 mm being appropriate. Two threaded through holes 405 are vertically machined at equal distances inside this circular through hole 404. The diameter and hole pitch match the two round holes 1201 on the pin shaft pressing plate 212.

[0059] Refer to Figure 5, there are 2 boom sliders 203, made of ZQSn6-6-3 alloy, which are stepped rectangular bodies for machining round holes; the rectangular bodies are machined with inner steps 501 at equal intervals in the middle. The width of the inner step 501 matches the width of the rectangular slot 306 of the rocker arm frame 201, and clearance fit is preferably adopted, with a clearance of 0.02 - 0.04 mm being appropriate; a circular through-hole 502 is vertically machined in the middle of the rectangular body. The diameter of the hole matches the outer diameter of the first pin 211, and transition fit is preferably adopted. Both ends of the circular through-hole 502 are chamfered at 45 degrees. Among them, the overall structure of the boom slider 203 can also be understood as a stepped structure formed by a column 504 and a shoulder 503. When in use, the shoulder 503 is located outside the side plate 304 of the rocker arm frame 201, and the column 504 is inserted into the rectangular slot 306 of the rocker arm frame 201.

[0060] Refer to Figure 6 , there are 2 adjusting shims 204, made of Q235A, which are concentric rings with different diameters. The inner diameter of the ring matches the outer diameter of the first pin 211, and it is appropriate that the inner diameter of the ring is the outer diameter of the first pin + 2 - 5 mm; the outer diameter of the ring should not exceed the total width of the boom slider 203. Both the inner and outer diameters of the ring are chamfered at 45 degrees.

[0061] Refer to Figure 10 , there is 1 bolt 205, made of carbon steel, with a strength not less than 8.8 grade, presenting a stepped cylindrical structure; the diameter of the large-diameter section matches the outer diameter of the large-diameter stepped hole at the front end plate of the rocker arm frame 201, and it is appropriate that it is 3 - 5 mm smaller than the outer diameter of the large-diameter stepped hole; the outer diameter of the middle-diameter section matches the diameter of the small-diameter stepped hole at the front end plate of the rocker arm frame 201, and interference fit is preferably adopted, with an interference of 0.02 - 0.04 mm being appropriate; the diameter of the small-diameter cylindrical section is slightly smaller than the diameter of the middle-diameter section by 0.2 - 0.3 mm, and a triangular thread is machined at the end of this cylinder, with a pitch of 2 mm being appropriate, and the length of the threaded section is not less than 70 mm being appropriate. A rectangular groove is machined on the outer circumferential surface of the threaded section, with the length of the groove being consistent with the length of the threaded section and the width of the groove being consistent with the width of the inner ear of the lock washer 209. Among them, when "spring bolt" is mentioned in the text of this application, it refers to the bolt 205 here.

[0062] Refer to Figure 7 , there is 1 compression spring 206, made of 60Si2Mn, which is a customized part. The spring is right-handed, with a free height Ho not less than 160 mm, a total number of turns n1 not less than 7 turns, an effective number of turns n not less than 5 turns, and a load-bearing capacity per millimeter not less than 20 kg.

[0063] Refer to Figure 8, there is 1 spring compression ring, made of Q235A, which is a concentric stepped ring. The inner diameter of the ring matches the outer diameter of the small-diameter section of bolt 205, and a clearance fit is preferably adopted, with a clearance of 0.30 - 0.50 mm being appropriate; the outer diameter of the ring is adapted to compression spring 206, and the outer diameter of the ring is preferably the outer diameter of the compression spring minus 8 - 12 mm; the thickness is preferably 12 - 15 mm.

[0064] Refer to Figure 9 , nut 208 is a round nut, there are 2 pieces, made of Q235A, which is a concentric stepped ring. The two ends of the ring are machined with inclined planes, and the inner diameter of the ring is machined with triangular threads, and the hole pitch and hole diameter are consistent with the pitch and outer diameter of the threaded section of bolt 205; on the outer circumferential surface of the ring, rectangular grooves 901 with a width of not less than 10 mm are machined according to four equal parts, and the groove width matches the width of the outer ear of retaining washer 209.

[0065] There is 1 retaining washer 209, which is a standard part.

[0066] There are 2 pin shafts, namely the second pin shaft 210 and the first pin shaft 211 respectively. The second pin shaft 210 is used for connecting the circular through hole 305 on the clamping plate of the rocker arm frame 201, and the first pin shaft 211 is used for connecting the rectangular slot hole 306 of the rocker arm frame 201, the arm frame slider 203, and the pin hole (i.e., the circular through hole 404) of the rocker arm crank 202; Refer to Figure 11 , the outer diameters of the 2 pin shafts are the same, but the lengths are different from the spacing of the rectangular grooves; the pin shafts are cylinders, and the outer diameters respectively match the inner diameters of the corresponding pin holes / through holes, and an interference fit is preferably adopted, with an interference of 0.02 - 0.04 mm being appropriate; on the outer circumferential surface near both ends of the pin shafts, 2 rectangular grooves 1101 are respectively machined, and the groove width matches the width (thickness) of the pin shaft pressing plate 212, and the bottom plane of the groove is perpendicular to the axis line of the pin shaft, and the bottom planes of the rectangular grooves at both ends of the same pin shaft are on the same plane (same depth).

[0067] Refer to Figure 12 , there are 4 pin shaft pressing plates 212, made of Q235A, which are rectangular bodies with circular holes machined; on the plane of the rectangular body, 2 circular through holes 1201 are machined vertically at equal distances in the middle, and the hole diameter and hole pitch match the hole diameter and hole diameter of the 2 threaded through holes 307 beside the pin hole of the rocker arm frame and the 2 threaded through holes 405 beside the pin hole on the clamping plate of the rocker arm crank, and 45-degree chamfers are machined at the four corners of the rectangular body of the pressing plate.

[0068] There are 2 groups of fasteners, all of which are standard parts, consisting of 8 hexagon bolts 213 and 8 spring washers 214 (see the indexing in Figure 2 ).

[0069] That is, the rocker arm frame 201 of the device of the present utility model is externally arranged to span and cover the upper part of the cam. The end is passed through the cylindrical hole of the rocker arm frame by a pin shaft. After installing a short cylindrical roller bearing, it is connected to the built-in rocker of the swing crankshaft, and is locked by a two-way pressing plate fastener; a rectangular hole is machined at the head of the rocker arm frame (referring to the right side in the figure), an arm frame slider is arranged, and a cylindrical hole is machined on the plane of the slider for installing the pin shaft; after the rocker arm crank is connected to the spring bolt, the rocker arm crank, the short cylindrical roller bearing and the cylindrical hole at the head end of the rocker arm frame are connected by a pin shaft, and are locked by a pressing plate fastener. An adjusting shim is arranged between the arm frame slider and the rocker arm crank to correct the clearance.

[0070] When the rocker arm frame device of the present utility model for the feed rotary mechanism of a seamless steel tube cold rolling mill is in use, component assembly needs to be carried out first. That is:

[0071] 1) Rocker arm frame assembly: Place 2 side plates in a fixed orientation on the welding platform and fix them with a tooling; Center and position the rear side plate on the end face of the rocker arm frame near the pin hole and flush it, then spot weld for preliminary positioning; Subsequently, place the front end plate with the large-diameter stepped hole facing inward, center and position it on the end face of the rocker arm frame near the rectangular slot hole and flush it, then spot weld for preliminary positioning; After measurement and correction, weld it into shape.

[0072] 2) Rocker arm crank assembly: Place the connecting plate in a fixed orientation on the welding platform and fix it with a tooling; Place 2 side plates (i.e., clamping plates) with the pin hole and the threaded hole ends facing upward on the two end planes of the connecting plate, pre-install the pin shaft to ensure concentricity, spot weld for preliminary positioning, and weld it into shape after measurement and correction.

[0073] 3) Spring bolt assembly: Install the spring bolt in the stepped hole of the front end plate of the rocker arm frame in a fixed orientation.

[0074] In this way, the offline pre-assembly of some components of the rocker arm frame device is completed, and it can be used on the machine or used as a spare part.

[0075] When using it on the machine, first open the feed and slewing mechanism box body, remove the failed rocker arm frame device, clean the site and then carry out on-site installation, that is: first use a lifting machine to orient and cover the rocker arm frame on the top of the cam, and both the built-in swing crank of the swing crank shaft and the rotating shaft are within the rocker arm frame; secondly, directionally assemble the second pin shaft in the cylindrical pin hole of the rocker arm frame and pass through the built-in swing crank of the swing crank shaft, install the pressure plates on both sides after fixing and alignment, and lock and prevent loosening with fasteners; subsequently, install the boom sliders in the rectangular slot holes on both sides of the rocker arm frame respectively, and pass the round holes of the rocker crank connecting plate through the spring bolts and then install them on both sides of the rocker arm frame directionally; at this time, measure the clearance value between the inner side of the rocker crank and the boom slider, and correct and grind the adjusting shim; then directionally install the first pin shaft in the cylindrical pin hole of the rocker crank, and sequentially pass through the adjusting shim, boom slider, built-in swing crank of the rotating shaft, etc., install the pressure plates on both sides after fixing and alignment, and lock and prevent loosening with fasteners; finally, install the compression spring, spring retaining ring, etc. on the bolt in sequence, pre-tighten with 1 round nut, after the pre-tightening force is in place and the initial clearance meets the technical requirements, install the thrust washer and lock and prevent loosening with another round nut. In this way, the on-site (on-machine) installation of the design of the present utility model is completed, and it can be put into the production of seamless steel pipe cold rolling. Figure 13 and Figure 14 Fig. Figure 14 shows the working state schematic diagram of the design of the present utility model, in which the rolling bearing 1401, the camshaft system cam 1402, the rolling bearing 1403, the inner swing crank 1404 of the swing crank shaft system, the axial positioning sleeve 1405 and the inner swing crank 1406 of the rotating shaft system are schematically shown.

[0076] The device of the present utility model is reasonably designed, compact in structure, accurate in positioning, resistant to vibration and impact, strong in load-bearing capacity, safe and reliable, practical and efficient, effectively improving the operation accuracy and stability of the rocker arm frame device. The boom slider structure is adopted and combined with the compression spring in an orderly manner to achieve elastic contact in the conversion between the cam surface and the plane, effectively reducing the instantaneous impact phenomenon caused by factors such as large load and large clearance; the installation clearance between the boom slider and the rocker crank is corrected in time by the adjusting shim, improving the accuracy during initial installation, reducing the offset of the rocker arm (frame), and avoiding the deformation failure of the rocker arm (frame). Through production practice application, the rocker arm (frame) reduces faults such as deformation and rupture of the rocker arm (frame), damage of the short cylindrical roller bearing, and escape of the roller outer ring from the source, meets the requirements of cold rolling of high-alloy element and high-strength seamless steel pipes, and promotes the core competitiveness of the enterprise in the market. It has strong versatility and has certain reference and application value for the technical improvement of the feed and slewing mechanism of the seamless steel pipe cold rolling mill.

[0077] When the above device of the present utility model was tested in the steel pipe factory of a certain iron and steel company, it obtained good application effects on various types of two-high periodic cold rolling mills with a finished outer diameter specification of less than 110 mm (such as LG-30H, LG-60H, LG-110H, etc.).

Claims

1. A rocker arm device for a feeding rotary mechanism of a seamless steel tube cold rolling mill, characterized in that: It comprises a rocker arm frame (201) and a rocker arm crank (202); The frame body of the rocker frame (201) is formed by a front end plate (302) at the front, a rear end plate (303) at the rear, and two side plates (304) parallel to each other. The middle section of the frame body of the rocker frame (201) is provided with an inward recessed portion (309). The first pin shaft (211) and the second pin shaft (210) are provided on opposite sides of the recessed portion (309). The side plates (304) on both sides are respectively the first side plate and the second side plate. The two ends of the first pin shaft (211) and the second pin shaft (210) are respectively positioned on the first side plate and the second side plate. The first pin shaft (211) is located on a side close to the front end plate (302). The front end plate (302) is provided with a first through hole (301). The rocker crank (202) is composed of two parallel clamping plates (402) and a connecting plate (401) connecting the two clamping plates, the distance between the inner sides of the two clamping plates (402) is greater than the width between the outer sides of the two side plates (304); the two clamping plates are clamped outside the two side plates and connected via the first pin shaft (211), the connecting plate (401) is located outside the front end plate (302), and a second through hole (403) corresponding to the first through hole (301) is opened on the connecting plate (401); It also includes a bolt (205), the head of which is located at the inner end of the front end plate (302), the bolt rod is inserted from the first through hole (301) and extends out of the connecting plate (401) through the second through hole (403), and a stopper is provided on the extended section of the bolt rod, and a compression spring (206) is sleeved on the bolt rod between the stopper and the second through hole (403).

2. The rocker arm device for the feeding rotary mechanism of the seamless steel tube cold rolling mill according to claim 1, characterized in that: An arm support slider (203) is padded between each clamping plate (402) of the rocker arm crank (202) and the side plate (304) on the corresponding side. The arm support slider (203) is sleeved on the first pin shaft (211) in the form of a shaft sleeve.

3. The rocker arm device for the feeding rotary mechanism of the seamless steel tube cold rolling mill according to claim 2, characterized in that: The arm support slider is in the shape of a step as a whole. The step-shaped structure is composed of a column (504) and a shoulder (503). The column (504) is provided with a sleeve hole that passes through the first pin shaft (211); the shoulder (503) is padded between the clamping plate (402) and the side plate (304).

4. The rocker arm device for the feeding rotary mechanism of the seamless steel tube cold rolling mill according to claim 3, characterized in that: An adjustment gasket (204) is provided between the side plate (304) and the clamping plate (402), and the adjustment gasket is sleeved on the first pin shaft (211).

5. The rocker arm device for the feeding rotary mechanism of the seamless steel tube cold rolling mill according to claim 1, characterized in that: The first through hole (301) and the second through hole (403) are coaxial holes.

6. The rocker arm device for the feeding rotary mechanism of the seamless steel tube cold rolling mill according to claim 1 or 5, characterized in that: The stopper is a nut (208) threadedly fixed to the end of the bolt (205).

7. The rocker arm device for the feeding rotary mechanism of the seamless steel tube cold rolling mill according to claim 6, characterized in that: A backstop washer (209) is provided between the stopper and the compression spring (206), and two ends of the compression spring respectively abut against the outer end surface of the connecting plate (401) and the backstop washer (209).

8. The rocker arm device for the feeding and rotating mechanism of the seamless steel tube cold rolling mill according to claim 1, characterized in that: The concave surface of the inner concave portion (309) comprises a straight surface (310) and a curved surface (311) connected to the straight surface.

9. The rocker arm device for the feeding rotary mechanism of the seamless steel tube cold rolling mill according to claim 8, characterized in that: An outwardly convex trapezoid (308) is provided at the side plate of the rocker frame corresponding to the inner recess (309) and convex outwardly along the plane where the side plate is located.

10. The rocker arm device for the feeding rotary mechanism of the seamless steel tube cold rolling mill according to claim 1, characterized in that: Grooves (1101) perpendicular to the axial direction are respectively provided at both ends of the shaft body of the first pin shaft (211), and a pin shaft pressure plate (212) is embedded in each of the grooves. The pin shaft pressure plate (212) is fastened to the clamping plate (402) of the rocker arm crank on the corresponding side via a fastener.

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