A horizontal roll stand for a pipe welding apparatus

Abstract

This invention discloses a horizontal roller mill frame for pipe welding equipment. A first bearing, a self-aligning bearing, is installed between one end of the upper horizontal shaft and the upper slide block of the movable frame. A second bearing, a tapered roller bearing, is installed between the other end of the upper horizontal shaft and the fixed frame. One end of the inner ring of the second bearing abuts against the shoulder of the upper horizontal shaft, and the opposite end is fixed by a spacer and a locking nut. One end of the outer ring of the second bearing abuts against the boss of the upper slide block of the fixed frame, and the opposite end is pressed by the bearing cap of the upper slide block of the fixed frame. A first adjusting shim is provided between the fixed frame and the bearing cap of the upper slide block of the fixed frame. The lower horizontal shaft is similar. The bearings of this horizontal roller mill frame are not easily damaged, and the structural stability is ensured.

Description

Technical Field

[0001] This invention relates to the field of welded pipe production equipment, and particularly to a horizontal roller mill frame for welded pipe equipment. Background Technology

[0002] On the welded pipe production line, steel strip forming, rolling and sizing are very important steps in the welded pipe production process. The rationality and stability of their structure have a great impact on the stable operation and quality of welded pipe production.

[0003] The horizontal roller mill frame is an important component of the forming and sizing process in the welded pipe production line. Existing horizontal roller mill frames have the following problems:

[0004] 1. The horizontal roller is installed on the horizontal shaft, and the bearings at both ends of the horizontal shaft are respectively installed on the sliders in the fixed frame and the movable frame. When the horizontal roller is working, the height of the horizontal roller needs to be adjusted to meet the requirements of steel pipe forming and sizing. After adjustment, there will be a deviation in the coaxiality of the two ends of the horizontal shaft, which means that the bearings at both ends of the horizontal shaft need to withstand the bending force caused by the deviation in the coaxiality of the horizontal shaft during operation, affecting the accuracy and life of the bearings.

[0005] 2. In the horizontal roller fixed frame structure, the upper and lower sliders of the fixed frame are embedded in the inner cavity of the frame and are in a sliding fit. Traditional fixed frames do not have a clearance adjustment structure; instead, the bearing cap is used to simultaneously press the fixed frame, sliders, and bearing outer ring. Due to limitations in machining accuracy and structure, the bearing cap cannot reliably press the slider, fixed frame, and bearing outer ring simultaneously. A gap will exist between the bearing or the fixed frame and the bearing cap. During operation, this gap will cause axial movement and radial runout of the horizontal shaft, affecting the forming and sizing accuracy of the steel pipe. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings and deficiencies of the prior art and provide a horizontal roller frame for pipe welding equipment.

[0007] The objective of this invention is achieved through the following technical solution:

[0008] A horizontal roller frame for pipe welding equipment includes a fixed frame, a movable frame, an upper horizontal roller, and a lower horizontal roller, wherein the upper horizontal roller and the lower horizontal roller are respectively mounted on an upper horizontal shaft and a lower horizontal shaft.

[0009] The first bearing installed between one end of the upper horizontal shaft and the upper slider of the movable frame is a self-aligning bearing;

[0010] The second bearing, a tapered bearing, is installed between the other end of the upper horizontal shaft and the fixed frame. One end of the inner ring of the second bearing is pressed against the shoulder of the upper horizontal shaft, and the opposite end is fixed by the inner ring spacer and the inner ring lock nut of the second bearing. One end of the outer ring of the second bearing is pressed against the boss of the upper slide block of the fixed frame, and the opposite end is pressed by the upper slide block bearing cover of the fixed frame. A first adjusting pad is provided between the fixed frame and the upper slide block bearing cover of the fixed frame.

[0011] Similarly, the design of the two ends of the lower horizontal axis and the movable and fixed frames is the same as that of the upper horizontal axis.

[0012] The upper slider bearing cover of the fixed frame is locked onto the upper slider of the fixed frame; the upper slider bearing cover of the fixed frame is provided with a first adjusting bolt and a first locking nut, the first adjusting bolt presses the first adjusting pad onto the fixed frame and locks it with the first locking nut.

[0013] The movable frame is equipped with a lifting screw in the longitudinal direction. The bottom of the lifting screw is fixed to the slider on the movable frame through a screw connecting block and a pin. The lifting screw passes through the center of the worm wheel. Through the internal and external thread engagement, rotating the worm wheel drives the screw to rotate, thereby raising or lowering the screw. The screw drives the slider on the movable frame to move up and down.

[0014] The fixed frame also has the same structure as the movable frame; the two ends of the upper horizontal shaft are respectively placed in the upper sliders of the fixed frame and the movable frame; the worm of the movable frame and the worm of the fixed frame are linked by a coupling to realize the synchronous adjustment of the height of the two ends of the upper horizontal roller; disconnecting the coupling realizes the asynchronous adjustment of the height position of the two ends of the upper horizontal roller.

[0015] The lifting screw is a trapezoidal lifting screw.

[0016] The worm gear of the movable frame and the worm gear of the fixed frame are respectively connected to the movable frame body and the fixed frame body through bearings.

[0017] The first adjusting pad is a copper pad strip.

[0018] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0019] 1. In this invention, tapered bearings are used between the upper and lower sliders of the fixed frame and the upper and lower horizontal shafts; self-aligning bearings are used between the upper and lower sliders of the movable frame and the upper and lower horizontal shafts. Self-aligning bearings can automatically adjust the angle and can withstand heavy loads, avoiding the problem of reduced bearing precision, shortened lifespan, or even damage caused by the bending force resulting from the coaxiality deviation of the horizontal shaft during operation.

[0020] 2. In the upper horizontal shaft assembly of the fixed frame structure, due to the inherent dimensional errors in the manufacturing and processing of the component parts, when the upper slider bearing cap of the fixed frame is installed and tightened onto the upper slider of the fixed frame, and the outer ring of the tapered roller bearing is pressed down, the fit between the upper slider and the fixed frame cannot achieve smooth sliding without any loosening gaps. This invention places a first adjusting shim between the upper slider bearing cap and the fixed frame. After the upper slider bearing cap of the fixed frame presses down on the outer ring of the tapered roller bearing, the adjusting bolt is tightened to press the first adjusting shim onto the fixed frame. After the tightness is appropriate, the bolt is then locked to the upper slider bearing cap of the fixed frame with a lock nut to ensure structural stability. This ensures that there are no loosening gaps after the upper slider bearing cap of the fixed frame is pressed down onto the fixed frame, while the upper slider of the fixed frame can still slide smoothly within the fixed frame when adjusting its height. Similarly, the lower horizontal shaft assembly of the fixed frame structure follows the same principle.

[0021] 3. In this invention, a groove is machined inside the upper horizontal shaft bearing sleeve of the movable frame, and a retaining spring is installed in the groove. This prevents the upper horizontal shaft bearing sleeve from detaching from the inner ring of the first bearing along with the upper horizontal shaft during the disassembly and assembly of the movable frame when changing rolls, thus avoiding damage to the first bearing during the disassembly and assembly of the movable frame. The same design is made inside the lower horizontal shaft bearing sleeve of the movable frame. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of a horizontal roller frame for pipe welding equipment according to the present invention.

[0023] Figure 2 for Figure 1 The sectional view is a plane containing the central axes of the upper and lower horizontal axes.

[0024] Figure 3 for Figure 2 This is a magnified view of a portion of the area where the upper horizontal axis is located.

[0025] The meanings of the reference numerals in the attached figures are as follows:

[0026] 1-Fixed frame, 2-Modible frame, 3-Upper horizontal roller, 4-Lower horizontal roller, 5-Upper horizontal shaft, 6-Lower horizontal shaft, 7-Upper slide block of movable frame, 8-First bearing, 9-Bearing sleeve of upper horizontal shaft, 10-Snap ring, 11-Second bearing, 12-Shoulder of upper horizontal shaft, 13-Inner ring spacer of second bearing, 14-Upper slide block of fixed frame, 15-Bearing cover of upper slide block of fixed frame, 16-First adjusting pad, 17-First adjusting bolt, 18-First locking nut, 19-Lifting block 20 - Lead screw, 21 - Coupling, 22 - Adjusting handwheel, 23 - Adjusting motor, 24 - Upper slider bearing cover of movable frame, 25 - Upper slider sealing ring of movable frame, 26 - Upper slider sealing ring of fixed frame, 27 - Second bearing outer ring spacer, 28 - Upper horizontal roller inner spacer, 29 - Upper horizontal roller outer spacer, 30 - Second bearing inner ring spacer lock nut, 31 - Upper horizontal shaft bearing sleeve tightening nut, 32 - Upper horizontal shaft bearing sleeve locking screw cover. Detailed Implementation

[0027] The present invention will be further described in detail below with reference to the embodiments and accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0028] like Figure 1 , 2 3. A horizontal roller frame for pipe welding equipment, mainly composed of a movable frame and a fixed frame. The upper and lower horizontal shafts connect the movable frame and the fixed frame to form a rigid whole. The rolling dies (i.e., the upper horizontal roller and the lower horizontal roller) are symmetrically installed on the upper and lower horizontal shafts.

[0029] The first bearing between one end of the upper horizontal shaft and the upper slide of the movable frame is a self-aligning bearing (either a self-aligning roller bearing or a self-aligning ball bearing), and the second bearing between the other end of the upper horizontal shaft and the fixed frame is a tapered roller bearing. When there is a deviation in the coaxiality between the two ends of the horizontal shaft, the self-aligning bearing automatically adjusts its angle to compensate for the coaxiality deviation, so that the upper horizontal shaft will not generate bending force caused by the coaxiality deviation between the two ends of the horizontal shaft during operation.

[0030] The upper slide of the movable frame is installed on the movable frame. Two first bearings are installed side by side inside the upper slide of the movable frame. The outer ring of one of the first bearings is pressed against the boss of the upper slide of the movable frame. The upper slide bearing cover of the movable frame is locked on the upper slide of the movable frame. The upper slide of the movable frame and the two sides of the upper slide bearing cover of the movable frame press against the movable frame. The inner boss of the upper slide bearing cover of the movable frame presses against the outer ring of the other first bearing.

[0031] The upper horizontal shaft bearing sleeve is installed in the inner rings of the two first bearings; the upper horizontal shaft bearing sleeve has a boss on one side and a retaining spring on the other side to limit the range of motion of the upper horizontal shaft bearing sleeve in the inner rings of the two first bearings.

[0032] The upper slider assembly of the movable frame has two sealing rings. One is installed on the upper slider bearing cover of the movable frame, and the other is installed on the upper slider of the movable frame. The upper horizontal shaft bearing sleeve passes through the inner rings of the two sealing rings to prevent dust and water from entering the first bearing and to prevent grease from overflowing when oil is injected through the oil filling hole.

[0033] The second bearing, a tapered roller bearing, is installed between the other end of the upper horizontal shaft and the fixed frame. One end of the inner ring of the second bearing is pressed against the shoulder of the upper horizontal shaft, and the opposite end is fixed by the inner ring spacer and the inner ring lock nut. One end of the outer ring of the second bearing is pressed against the boss of the upper slide block of the fixed frame, and the opposite end is pressed by the upper slide block bearing cover of the fixed frame. A first adjusting shim is provided between the fixed frame and the upper slide block bearing cover of the fixed frame. The first adjusting shim is a copper shim. This ensures that there is no loose gap after the upper slide block bearing cover of the fixed frame is pressed against the fixed frame, while the upper slide block of the fixed frame can also slide smoothly in the fixed frame when adjusting the height.

[0034] The upper horizontal shaft bearing sleeve locking screw and the upper horizontal shaft bearing sleeve locking screw cover are used to lock the upper horizontal shaft bearing sleeve top nut to prevent loosening.

[0035] The upper slider of the fixed frame has two second bearings installed back to back, and the two second bearings are separated by a spacer sleeve of the outer ring of the second bearing.

[0036] The upper slider assembly of the fixed frame has two sealing rings. One is installed on the upper slider bearing cover of the fixed frame, and the other is installed on the upper slider of the fixed frame. Then, one end of the upper horizontal shaft passes through the inner rings of the two sealing rings to prevent dust and water from entering the second bearing and to prevent grease from overflowing when oil is injected through the oil filling hole.

[0037] The upper slider bearing cover of the fixed frame is equipped with a first adjusting bolt and a first locking nut. The first adjusting bolt presses the first adjusting pad onto the fixed frame (at this time there is no loose gap, and when adjusting, the upper slider of the fixed frame can slide smoothly in the fixed frame) and is locked with the first locking nut.

[0038] The movable frame is equipped with a lifting screw in the longitudinal direction. The bottom of the lifting screw is fixed to the upper slider of the movable frame through a screw connecting block and a pin. The lifting screw passes through the center of the worm wheel. Through the internal and external thread engagement, rotating the worm wheel drives the screw to rotate, thereby raising or lowering the screw. The screw drives the upper slider of the movable frame to move up and down.

[0039] The fixed frame also has the same structure as the movable frame; the two ends of the upper horizontal shaft are respectively placed in the upper sliders of the fixed frame and the movable frame; the worm of the movable frame and the worm of the fixed frame are linked by a coupling to realize the synchronous adjustment of the height of the two ends of the upper horizontal roller; disconnecting the coupling realizes the asynchronous adjustment of the height position of the two ends of the upper horizontal roller.

[0040] The lifting screw is a trapezoidal lifting screw.

[0041] The worm gear of the movable frame and the worm gear of the fixed frame are respectively connected to the movable frame body and the fixed frame body through bearings.

[0042] The movable frame has an adjusting handwheel installed on its worm gear, while the fixed frame has an adjusting motor installed on its worm gear. With the help of the coupling, the height of the upper horizontal shaft and the upper horizontal roller can be adjusted synchronously by adjusting either the handwheel or the motor.

[0043] Both the upper slider of the fixed frame and the upper slider of the movable frame are provided with an oil injection hole and an exhaust hole. The oil injection hole allows grease to be injected into the inner cavity of the upper slider of the fixed frame and the upper slider of the movable frame, as well as into the first and second bearings, to lubricate the first and second bearings. The exhaust hole is used to expel air from the inner cavity of the upper slider of the fixed frame and the upper slider of the movable frame during oil injection.

[0044] Similarly, the design of the two ends of the lower horizontal shaft and the movable and fixed frames is the same as that of the upper horizontal shaft (except that the sliders on the fixed and movable frames corresponding to the upper horizontal shaft are fixed with lifting screws):

[0045] The third bearing installed between one end of the lower horizontal shaft and the lower slide of the movable frame is a self-aligning bearing.

[0046] The fourth bearing, a tapered bearing, is installed between the other end of the lower horizontal shaft and the fixed frame. One end of the inner ring of the fourth bearing is pressed against the shoulder of the lower horizontal shaft, and the opposite end is fixed by the inner ring spacer and the inner ring lock nut of the fourth bearing. One end of the outer ring of the fourth bearing is pressed against the boss of the lower slide block of the fixed frame, and the opposite end is pressed by the lower slide block bearing cover of the fixed frame. A second adjusting pad is provided between the fixed frame and the lower slide block bearing cover of the fixed frame.

[0047] The lower slide of the fixed frame has two fourth bearings installed back to back, and the two fourth bearings are separated by a spacer for the outer ring of the fourth bearing.

[0048] In practical use, the inner spacer of the upper horizontal roll is first inserted along the upper horizontal shaft onto the shoulder of the upper horizontal shaft, and then the upper horizontal roll and the outer spacer of the upper horizontal roll are inserted in sequence. Similarly, the inner spacer of the lower horizontal roll is inserted along the lower horizontal shaft onto the shoulder of the lower horizontal shaft, and then the lower horizontal roll and the outer spacer of the lower horizontal roll are inserted in sequence. After completion, the movable frame is pushed in. At this time, the bearing sleeve of the upper horizontal shaft is inserted into the upper horizontal shaft, and the upper horizontal shaft bearing sleeve is tightened by the top nut. The boss of the upper horizontal shaft bearing sleeve tightens the outer spacer of the upper horizontal roll, the upper horizontal roll, and the inner spacer of the upper horizontal roll onto the shoulder of the upper horizontal shaft. Similarly, the bearing sleeve of the lower horizontal shaft is inserted into the lower horizontal shaft, and the top nut of the lower horizontal shaft bearing sleeve tightens the lower horizontal shaft bearing sleeve. The boss of the lower horizontal shaft bearing sleeve tightens the outer spacer of the lower horizontal roll, the lower horizontal roll, and the inner spacer of the lower horizontal roll onto the shoulder of the lower horizontal shaft, and the rolling center line of the horizontal roll is established.

[0049] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

Claims

1. A horizontal roller frame for pipe welding equipment, comprising a fixed frame, a movable frame, an upper horizontal roller, and a lower horizontal roller, wherein the upper horizontal roller and the lower horizontal roller are respectively mounted on an upper horizontal shaft and a lower horizontal shaft; characterized in that: The first bearing installed between one end of the upper horizontal shaft and the upper slider of the movable frame is a self-aligning bearing; The second bearing, a tapered bearing, is installed between the other end of the upper horizontal shaft and the fixed frame. One end of the inner ring of the second bearing is pressed against the shoulder of the upper horizontal shaft, and the opposite end is fixed by the inner ring spacer and the inner ring lock nut of the second bearing. One end of the outer ring of the second bearing is pressed against the boss of the upper slide block of the fixed frame, and the opposite end is pressed by the upper slide block bearing cover of the fixed frame. A first adjusting pad is provided between the fixed frame and the upper slide block bearing cover of the fixed frame. The upper slider of the fixed frame has two second bearings installed back to back, and the two second bearings are separated by a spacer sleeve of the outer ring of the second bearing. Similarly, the design of the two ends of the lower horizontal axis with the movable frame and the fixed frame is the same as that of the upper horizontal axis.

2. The horizontal roller mill frame for pipe welding equipment according to claim 1, characterized in that: The upper slider of the movable frame is installed on the movable frame. Two first bearings are installed side by side inside the upper slider of the movable frame. The outer ring of one of the first bearings is pressed against the boss of the upper slider of the movable frame. The upper slider bearing cover of the movable frame is locked on the upper slider of the movable frame. The upper slider of the movable frame and the two sides of the upper slider bearing cover of the movable frame press against the movable frame. The inner boss of the upper slider bearing cover of the movable frame presses against the outer ring of the other first bearing. The upper horizontal shaft bearing sleeve is installed in the inner rings of the two first bearings; the upper horizontal shaft bearing sleeve has a boss on one side and a retaining ring on the other side.

3. The horizontal roller mill frame for pipe welding equipment according to claim 1, characterized in that: It also includes a locking screw for the upper horizontal shaft bearing sleeve and a locking screw cover for the upper horizontal shaft bearing sleeve, used to lock the top nut of the upper horizontal shaft bearing sleeve.

4. The horizontal roller mill frame for pipe welding equipment according to claim 1, characterized in that: The upper slider of the movable frame and the upper slider bearing cover of the movable frame are equipped with the upper slider sealing ring of the movable frame; the upper slider of the fixed frame and the upper slider bearing cover of the fixed frame are equipped with the upper slider sealing ring of the fixed frame.

5. The horizontal roller mill frame for pipe welding equipment according to claim 1, characterized in that: The upper slider bearing cover of the fixed frame is locked onto the upper slider of the fixed frame; the upper slider bearing cover of the fixed frame is provided with a first adjusting bolt and a first locking nut, the first adjusting bolt presses the first adjusting pad onto the fixed frame and locks it with the first locking nut.

6. The horizontal roller mill frame for pipe welding equipment according to claim 1, characterized in that: The movable frame is equipped with a lifting screw in the longitudinal direction. The bottom of the lifting screw is fixed to the slider on the movable frame through a screw connecting block and a pin. The lifting screw passes through the center of the worm wheel. Through the internal and external thread engagement, rotating the worm wheel drives the screw to rotate, thereby raising or lowering the screw. The screw drives the slider on the movable frame to move up and down. The fixed frame also has the same structure as the movable frame; the two ends of the upper horizontal shaft are respectively placed in the upper sliders of the fixed frame and the movable frame; the worm of the movable frame and the worm of the fixed frame are linked by a coupling to realize the synchronous adjustment of the height of the two ends of the upper horizontal roller; disconnecting the coupling realizes the asynchronous adjustment of the height position of the two ends of the upper horizontal roller.

7. The horizontal roller mill frame for pipe welding equipment according to claim 1, characterized in that: Both the upper slider of the fixed frame and the upper slider of the movable frame are equipped with oil injection holes and vent holes.

8. The horizontal roller mill frame for pipe welding equipment according to claim 1, characterized in that: The worm gear of the movable frame and the worm gear of the fixed frame are respectively connected to the movable frame body and the fixed frame body through bearings.

9. The horizontal roller mill frame for pipe welding equipment according to claim 1, characterized in that: The first adjusting pad is a copper pad strip.

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