A rotary centering device for oil and gas drilling pumps used at construction sites

Abstract

The present invention discloses a rotary centering device for a petroleum and natural gas drilling pump for use at a construction site, belonging to the technical field of petroleum drilling tools, and comprising a base plate, on which a clamping assembly, a positioning assembly, and a measuring assembly are arranged. The clamping assembly can clamp and fix the center rod of a crosshead, i.e., clamp and fix the crosshead, so as to facilitate subsequent adjustment of the position of the crosshead. The positioning assembly can automatically adjust the position of the center rod of the crosshead according to the offset obtained by measurement, i.e., automatically adjust the position of the crosshead. Through the mutual cooperation of the clamping assembly, the positioning assembly, and the measuring assembly, the center of the cylinder sleeve and the crosshead can be automatically centered and adjusted without disassembling the cylinder sleeve, which can greatly reduce the damage of the piston and the cylinder sleeve caused by poor centering, save production costs, and achieve cost reduction and efficiency improvement.

Description

Technical Field

[0001] The invention relates to the technical field of oil drilling tools, in particular to a rotary centering device for an oil and gas drilling pump used at a construction site. Background Art

[0002] The oil and gas drilling pump is a three-cylinder or five-cylinder single-acting piston pump. During the maintenance and repair of the oil and gas drilling pump, in order to make the piston move correctly in the cylinder sleeve, the piston rod and the center tie rod are required to remain concentric, because the piston is installed in the cylinder sleeve and the center tie rod is fixed to the crosshead by bolts, so the cylinder sleeve and the crosshead are required to be concentrically aligned. If the crosshead is not well aligned during maintenance and repair, it will cause eccentric wear of the piston and cylinder sleeve in actual use, causing premature damage to the cylinder sleeve and piston, affecting the normal progress of the drilling project, especially the current widespread use of ceramic cylinder sleeves puts forward higher requirements for the concentric alignment of cylinder sleeves and crossheads than metal cylinder sleeves. Ceramic cylinder sleeves are wear-resistant and corrosion-resistant, and their normal service life is 6-8 times that of ordinary metal cylinder sleeves, but they are more easily damaged if they are poorly aligned. Since it is impossible to simply achieve concentric alignment of cylinder sleeves and crossheads on site, most drilling teams using old drilling pumps cannot use ceramic cylinder sleeves, which increases the cost of oil and gas drilling construction.

[0003] The previous method of crosshead centering is: install an extended centering tooling centering rod at the position of the crosshead installation center tie rod, the centering rod passes through the packing box installation hole, valve box and pump body installation hole, use an internal caliper to measure the clearance value around the centering rod and the packing box installation hole, valve box and pump body installation hole; adjust the concentricity of the crosshead according to the measured clearance value around. To adjust the centering with this method, it is necessary to remove the valve box of the hydraulic end of the oil and gas drilling pump. After on-site investigation, it was found that it is difficult to remove the valve box, and the corrosion and rust in the use environment make it impossible to accurately measure the clearance value around the installation hole of the packing box, valve box and pump body. At the same time, since the centering rod on the centering tooling will deform during use, affecting the measurement accuracy, this method is limited and it is difficult to ensure the adjustment accuracy.

[0004] A Chinese patent application with announcement number CN211401076U discloses a device for quickly detecting and centering a crosshead of a petroleum drilling guide plate, and its technical solution is: it includes a reference cylinder sleeve and a laser centering device, and a center mark is provided at the end of the reference cylinder sleeve; the laser centering device includes a laser probe, a probe correction screw, a probe fixing seat, a mounting flange, a mounting flange hole, and a positioning protrusion, and one end of the probe fixing seat is provided with a mounting flange, and the mounting flange is provided with a mounting flange hole and a positioning protrusion; the other end of the probe fixing seat is provided with a laser probe, and a plurality of probe correction screws are provided on the outer wall of the probe fixing seat. Although this patent can realize the centering detection of the crosshead, it still needs to manually adjust the position of the crosshead, and it is impossible to realize automatic adjustment after the centering detection of the crosshead. Therefore, the present invention provides a rotary centering device for oil and gas drilling pumps for use at a construction site. Summary of the invention

[0005] In view of the defects in the prior art, the present invention provides a rotary centering device for oil and gas drilling pumps for use on construction sites, which overcomes the problem that the position of the crosshead needs to be adjusted manually and automatic adjustment after the centering detection of the crosshead cannot be achieved.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a rotary centering device for a petroleum and natural gas drilling pump for use at a construction site, comprising a base plate, a clamping assembly being arranged on the base plate, the clamping assembly comprising an annular base frame and an annular slide, an offset slide being slidably mounted on the annular slide, a clamping circular plate being fixedly mounted on the offset slide, three clamping slide columns being slidably mounted on the clamping circular plate, the clamping slide columns being used to clamp and fix the center rod of a crosshead, a positioning assembly and a measuring assembly being also arranged on the base plate, the positioning assembly comprising an adjusting gear ring and an adjusting circular plate, the adjusting circular plate being fixedly mounted on the offset slide, the adjusting gear ring being rotatably mounted on the annular base frame, a positioning push plate 1 and a positioning push plate 2 being slidably mounted on the positioning gear ring, the positioning push plate 1 and the positioning push plate 2 respectively slide to adjust the position of the crosshead, and the measuring assembly comprising an electronic dial indicator, which is used to measure the offset of the crosshead.

[0007] Furthermore, the clamping assembly also includes an offset slider symmetrically fixedly arranged on the annular slide, and a strip groove plate is fixedly installed on the offset slider. The offset slider and the annular base are in a sliding fit, and the strip groove plate and the offset slide seat are in a sliding fit.

[0008] Furthermore, a spline rod 1 is symmetrically fixedly arranged on the annular slide, and the spline rod 1 and the annular base frame form a spline sliding fit, and a spline rod 2 is symmetrically fixedly arranged on the offset slide, and the spline rod 2 and the annular slide frame form a spline sliding fit.

[0009] Furthermore, a clamping driving gear and three clamping auxiliary gears are rotatably installed on the clamping circular plate. The clamping auxiliary gears form a gear pair with the clamping driving gear. A clamping rotating plate is fixedly installed on the clamping auxiliary gears. A strip through hole is provided on the clamping rotating plate. The clamping rotating plate and the clamping sliding column are movably connected.

[0010] Furthermore, the positioning assembly also includes a positioning rotating plate and two driving gears, which are rotatably mounted on the positioning gear ring, and positioning push plates one and two are fixedly mounted with positioning racks, the positioning racks and the driving gears constitute a gear rack pair, and the two driving gears are frictionally connected to the positioning gear ring.

[0011] Furthermore, a positioning ratchet 1 and a positioning ratchet 2 are fixedly installed on the driving gear at the second positioning push plate, and the ratchet directions on the positioning ratchet 1 and the positioning ratchet 2 are opposite, and a positioning arc-shaped ratchet bar 1, a positioning arc-shaped ratchet bar 2, and a positioning arc-shaped rack are fixedly arranged on the positioning rotating plate, and the ratchet directions on the positioning arc-shaped ratchet bar 1 and the positioning arc-shaped ratchet bar 2 are opposite, and the positioning arc-shaped ratchet bar 1 and the positioning ratchet 1 are engaged to form a ratchet mechanism, and the positioning arc-shaped ratchet bar 2 and the positioning ratchet 2 are engaged to form a ratchet mechanism.

[0012] Furthermore, a positioning column gear is rotatably mounted on a driving gear at one position of the positioning push plate, a torsion spring is arranged between the positioning column gear and the driving gear at one position of the positioning push plate, and a gear pair is formed when the positioning column gear and the positioning arc rack are engaged.

[0013] Furthermore, the measuring assembly comprises a measuring base plate fixedly arranged on the adjusting circular plate, a measuring circular plate is rotatably mounted on the measuring base plate, and a second measuring electric cylinder is fixedly mounted on the side surface of the measuring circular plate.

[0014] Furthermore, the piston rod end of the measuring electric cylinder 2 is fixedly installed with the measuring electric cylinder 1, the piston rod end of the measuring electric cylinder 1 is fixedly installed with a measuring base, the side of the measuring base is fixedly installed with an angle adjustment motor, and the electronic dial indicator is fixedly installed on the output shaft of the angle adjustment motor.

[0015] Compared with the prior art, the present invention has the following beneficial effects: (1) By providing a clamping assembly, the present invention can clamp and fix the center rod of the crosshead, that is, clamp and fix the crosshead, which is convenient for subsequent adjustment of the position of the crosshead. (2) By providing a positioning assembly, the present invention can automatically adjust the position of the center rod of the crosshead according to the measured offset, that is, automatically adjust the position of the crosshead. (3) By the mutual cooperation of the clamping assembly, the positioning assembly and the measuring assembly, the present invention can automatically adjust the center of the cylinder liner and the crosshead without disassembling the cylinder liner, which can greatly reduce the damage to the piston and cylinder liner caused by poor centering, save production costs, and achieve cost reduction and efficiency improvement. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0017] Figure 2 It is a structural schematic diagram of the annular base frame of the present invention.

[0018] Figure 3 It is a schematic diagram of the structure of the offset slide seat of the present invention.

[0019] Figure 4 It is a schematic structural diagram of the clamping circular plate of the present invention.

[0020] Figure 5 It is a structural schematic diagram of the position adjustment component of the present invention.

[0021] Figure 6 for Figure 5 A local enlarged schematic diagram of point A in the middle.

[0022] Figure 7 for Figure 5 A local enlarged schematic diagram of point B in the middle.

[0023] Figure 8 It is a front view of the positioning assembly of the present invention.

[0024] Fig. 9 It is a schematic diagram of the structure of the measuring component of the present invention.

[0025] Fig.10 for Fig. 9 A partial enlarged schematic diagram of point C in the middle.

[0026] Fig.11 It is a side view of the overall structure of the present invention.

[0027] Reference numerals: 101-base plate; 102-annular base frame; 103-positioning rotating plate; 104-positioning gear ring; 105-measuring base plate; 106-measuring circular plate; 107-positioning circular plate; 108-spline rod one; 109-offset slide; 110-spline rod two; 111-strip groove plate; 112-offset slide; 113-annular slide; 114-clamping circular plate; 115-clamping motor; 116-clamping slide column; 117-clamping rotating plate; 118-clamping auxiliary gear; 119-clamping driving gear; 120-transposition motor; 1 21-transfer gear; 122-positioning motor; 123-positioning rack; 124-positioning column gear; 125-positioning push plate one; 126-positioning push plate two; 127-positioning ratchet one; 128-positioning arc ratchet one; 129-positioning arc ratchet two; 130-positioning arc rack; 131-positioning ratchet two; 132-measuring motor; 133-measuring gear; 134-measuring gear ring; 135-measuring electric cylinder one; 136-measuring electric cylinder two; 137-angle adjustment motor; 138-electronic dial indicator; 139-measuring base. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] Example: Reference Figure 1-Figure 11 A rotary centering device for a petroleum and natural gas drilling pump for use at a construction site comprises a base plate 101, a clamping assembly is arranged on the base plate 101, the clamping assembly comprises an annular base frame 102 and an annular slide 113, the annular base frame 102 is fixedly mounted on the base plate 101, an offset slide 109 is slidably mounted on the annular slide 113, a spline rod 110 is symmetrically fixedly arranged on the offset slide 109, the spline rod 110 and the annular slide 113 form a spline sliding fit, a spring is arranged between the spline rod 110 and the annular slide 113, and a spring is arranged between the annular slide 113 and the offset slide 109.

[0030] A spline rod 108 and an offset slider 112 are symmetrically fixedly arranged on the annular slide 113, a strip groove plate 111 is fixedly installed on the offset slider 112, the offset slider 112 and the annular base 102 are in sliding cooperation, the strip groove plate 111 and the offset slide 109 are in sliding cooperation, a spline rod 108 is symmetrically fixedly arranged on the annular slide 113, the spline rod 108 and the annular base 102 form a spline sliding cooperation, a spring is arranged between the spline rod 108 and the annular base 102, and a spring is arranged between the annular base 102 and the annular slide 113.

[0031] A clamping circular plate 114 is fixedly mounted on the offset slide 109, and three clamping slide columns 116 are slidably mounted on the clamping circular plate 114. The clamping slide column 116 is used to clamp the center rod of the fixed crosshead. A clamping driving gear 119 and three clamping auxiliary gears 118 are rotatably mounted on the clamping circular plate 114. The clamping auxiliary gears 118 all form a gear pair with the clamping driving gear 119. A clamping rotating plate 117 is fixedly mounted on the clamping auxiliary gear 118. The clamping rotating plate 117 is provided with a strip through hole. The clamping rotating plate 117 and the clamping slide column 116 are movable. A clamping motor 115 is fixedly mounted on the side of the clamping circular plate 114, and the output shaft of the clamping motor 115 is fixedly connected to the clamping driving gear 119.

[0032] The device is placed between the crosshead and the cylinder sleeve so that the side of the clamping circular plate 114 fits the end face of the center rod, and then the clamping motor 115 is started to drive the clamping active gear 119 to rotate, thereby driving the clamping auxiliary gear 118 to rotate, so that under the action of the clamping rotating plate 117, the clamping slide column 116 starts to slide toward the center of the clamping circular plate 114, and finally the three clamping slide columns 116 complete the fixed clamping of the center rod, that is, complete the fixed clamping of the crosshead.

[0033] At this time, since the axis center line of the crosshead may not be in the same straight line as the axis center line of the clamping circular plate 114, the offset slide 109 slides on the annular slide 113 under the action of the crosshead. While the offset slide 109 slides on the annular slide 113, the offset slide 109 slides on the strip groove plate 111, and under the action of the strip groove plate 111 and the offset slider 112, the annular slide 113 slides on the annular base frame 102.

[0034] A positioning assembly is also provided on the base plate 101, and the positioning assembly includes a positioning gear ring 104 and a positioning circular plate 107. The positioning circular plate 107 is fixedly mounted on the offset slide 109, and the positioning gear ring 104 is rotatably mounted on the annular base frame 102. A transposition gear 121 is rotatably mounted on the annular base frame 102. The positioning gear ring 104 and the transposition gear 121 constitute a gear pair, and a transposition motor 120 is fixedly mounted on the annular base frame 102. The output shaft of the transposition motor 120 is fixedly connected to the transposition gear 121. A positioning push plate 125 and a positioning push plate 2 126 are slidably mounted on the positioning gear ring 104. The positioning push plate 125 and the positioning push plate 2 126 slide respectively to adjust the position of the crosshead.

[0035] A positioning rotating plate 103 and two driving gears are rotatably mounted on the positioning gear ring 104, a positioning motor 122 is fixedly mounted on the positioning gear ring 104, an output shaft of the positioning motor 122 is fixedly connected to the positioning rotating plate 103, a positioning rack 123 is fixedly mounted on both the positioning push plate 125 and the positioning push plate 2 126, the positioning rack 123 and the driving gear form a gear rack pair, and the two driving gears are frictionally connected to the positioning gear ring 104.

[0036] The drive gear at the second adjustment push plate 126 is fixedly installed with an adjustment ratchet wheel 127 and an adjustment ratchet wheel 131. The ratchet teeth on the adjustment ratchet wheel 127 and the adjustment ratchet wheel 131 are in opposite directions. The ratchet teeth on the adjustment ratchet wheel 127 and the adjustment ratchet wheel 131 are elastic ratchet teeth. The adjustment rotating plate 103 is fixedly provided with an adjustment arc ratchet bar 128, an adjustment arc ratchet bar 129, and an adjustment arc rack 130. The ratchet teeth on the adjustment arc ratchet bar 128 and the adjustment arc ratchet bar 129 are in opposite directions. The adjustment arc ratchet bar 128 and the adjustment arc rack 130 are in opposite directions. When the ratchet 127 is engaged, a ratchet mechanism is formed. When the positioning arc ratchet 129 and the positioning ratchet 131 are engaged, a ratchet mechanism is formed. The positioning column gear 124 is rotatably mounted on the driving gear at the positioning push plate 125. A torsion spring is arranged between the positioning column gear 124 and the driving gear at the positioning push plate 125. One end of the torsion spring is fixedly connected to the positioning column gear 124, and the other end of the torsion spring is fixedly connected to the driving gear at the positioning push plate 125. When the positioning column gear 124 and the positioning arc rack 130 are engaged, a gear rack pair is formed.

[0037] By starting the transposition motor 120 to drive the transposition gear 121 to rotate, and then drive the adjustment gear ring 104 to rotate, so as to adjust the position of the adjustment push plate 125 and the adjustment push plate 2 126 contacting the adjustment circular plate 107, so as to adjust the adjustment circular plate 107 at different positions, and then start the adjustment motor 122 to drive the adjustment rotating plate 103 to rotate counterclockwise first, so that the adjustment arc ratchet bar 2 129 and the adjustment ratchet wheel 2 131 contact to form a ratchet mechanism, and then drive the adjustment ratchet wheel 2 131 to rotate clockwise. At this time, the adjustment ratchet wheel 127 is not in contact with the adjustment arc ratchet bar 128, that is, the driving gear at the adjustment push plate 2 126 drives the adjustment rack 123 at the adjustment push plate 2 126. Sliding, that is, driving the positioning push plate 2 126 to slide, the positioning push plate 2 126 contacts the positioning circular plate 107, and pushes the positioning circular plate 107 to slide, and because the two driving gears and the positioning gear ring 104 are frictionally connected, the positioning push plate 125 and the positioning push plate 2 126 will not rotate freely when there is no power, that is, the positioning push plate 125 and the positioning push plate 2 126 will not slide freely. After completing the adjustment in this direction, the positioning motor 122 drives the positioning rotating plate 103 to rotate clockwise. Due to the ratchet mechanism composed of the positioning arc ratchet bar 2 129 and the positioning ratchet wheel 2 131, the positioning arc ratchet bar 2 129 cannot drive the positioning ratchet wheel 2 131 to rotate at this time.

[0038] The adjusting arc rack 130 contacts the adjusting column gear 124 to form a gear pair, thereby driving the adjusting column gear 124 to rotate clockwise. At this time, the adjusting push plate 125 cannot slide, that is, the torsion spring between the driving gear at the adjusting column gear 124 and the adjusting push plate 125 is compressed, and finally the adjusting arc rack 130 is disengaged from the contact with the adjusting column gear 124. The adjusting column gear 124 is reset under the action of the torsion spring between the driving gear at the adjusting column gear 124 and the adjusting push plate 125. At this time, the adjusting arc ratchet 128 does not contact the adjusting ratchet 127, and then the adjusting motor 122 drives the adjusting rotating plate 103 to rotate counterclockwise. The adjusting arc rack 130 drives the adjusting column gear 124 to rotate counterclockwise, and then under the action of the driving gear at the adjusting push plate 125, the adjusting rack 123 is driven to slide, so that The adjustment push plate 125 contacts the adjustment circular plate 107 to push the adjustment circular plate 107 to slide. After the adjustment in this direction is completed, the crosshead is fixed and the adjustment motor 122 is started to drive the adjustment rotating plate 103 to rotate clockwise to complete the resetting of the adjustment push plate 125. Then the adjustment arc ratchet strip 128 contacts the adjustment ratchet wheel 127 to drive the adjustment ratchet wheel 127 to rotate, thereby making the driving gear at the adjustment push plate 126 rotate counterclockwise to complete the resetting of the adjustment push plate 126. After the adjustment push plates 125 and 126 are reset, the adjustment rotating plate 103 is driven by the adjustment motor 122 to return to the initial position. Since the adjustment ratchet wheel 127 and the adjustment arc ratchet strip 128 constitute a ratchet mechanism, when the adjustment arc ratchet strip 128 rotates counterclockwise, the adjustment ratchet wheel 127 will not be driven to rotate.

[0039] A measuring assembly is also provided on the base plate 101, and the measuring assembly includes a measuring base plate 105 fixedly provided on the adjusting circular plate 107, a measuring circular plate 106 and a measuring gear 133 are rotatably mounted on the measuring base plate 105, a measuring gear ring 134 is fixedly provided on the measuring circular plate 106, and the measuring gear 133 and the measuring gear ring 134 constitute a gear pair, a measuring motor 132 is fixedly installed on the side of the measuring base plate 105, and the output shaft of the measuring motor 132 is fixedly connected to the measuring gear 133, a measuring electric cylinder 2 136 is fixedly installed on the side of the measuring circular plate 106, a measuring electric cylinder 1 135 is fixedly installed on the piston rod end of the measuring electric cylinder 1 136, a measuring base 139 is fixedly installed on the piston rod end of the measuring electric cylinder 1 135, an angle adjustment motor 137 is fixedly installed on the side of the measuring base 139, and an electronic dial indicator 138 is fixedly installed on the output shaft of the angle adjustment motor 137.

[0040] After completing the fixation of the center rod of the crosshead, start the measuring electric cylinder 135, the measuring electric cylinder 136 and the angle adjustment motor 137, adjust the position of the electronic dial indicator 138, so that the probe of the electronic dial indicator 138 contacts the surface of the cylinder liner, and the axis of the measuring rod of the electronic dial indicator 138 is perpendicular to the axis of the cylinder liner, and then start the measuring motor 132 to drive the measuring gear 133 to rotate. Under the action of the measuring gear ring 134, the measuring circular plate 106 is driven to rotate, that is, the probe of the electronic dial indicator 138 is driven to slide on the surface of the cylinder liner, that is, the offset of the crosshead relative to the cylinder liner is completed through the electronic dial indicator 138.

[0041] Working principle: Place the device between the crosshead and the cylinder sleeve so that the side of the clamping circular plate 114 fits the end face of the center rod, and then start the clamping motor 115 to drive the clamping active gear 119 to rotate, so that the clamping slide 116 completes the clamping and fixing of the crosshead center rod. At this time, since the axis of the crosshead may not be in the same straight line as the axis of the clamping circular plate 114, the offset slide 109 slides on the annular slide 113 under the action of the crosshead. While the offset slide 109 slides on the annular slide 113, the offset slide 109 slides on the strip groove plate 111, and under the action of the strip groove plate 111 and the offset slider 112, the annular slide 113 slides on the annular base 102.

[0042] Then, through the action of the measuring motor 132, the measuring electric cylinder 135, the measuring electric cylinder 136 and the angle adjustment motor 137, the electronic dial gauge 138 measures the cylinder sleeve, that is, the electronic dial gauge 138 is used to complete the offset of the crosshead relative to the cylinder sleeve, and the concentricity of the crosshead and the cylinder sleeve is adjusted within the allowable range for normal operation of the oil and gas drilling pump according to the offset. The transposition motor 120 is started to drive the adjustment gear ring 104 to rotate, and the position of the adjustment push plate 125 and the adjustment push plate 2 126 contacting the adjustment circular plate 107 is adjusted. Then, the adjustment motor 122 is started to drive the adjustment rotating plate 103 to rotate, and according to the offset measured by the electronic dial gauge 138, the adjustment push plate 125 and the adjustment push plate 2 126 are driven to slide a corresponding distance to complete the adjustment of the position of the adjustment circular plate 107, that is, the adjustment of the crosshead position is completed, and then the center alignment adjustment of the cylinder sleeve and the crosshead is realized.

[0043] After the alignment is completed, the crosshead is fixed, and then the positioning motor 122 is started to drive the positioning rotating plate 103 to complete the reset of the positioning push plate 125 and the positioning push plate 2 126, and then the clamping motor 115 is started to make the clamping slide column 116 loosen the fixation on the center rod.

[0044] The present invention is not limited to the above-mentioned specific implementation modes. Various changes made by technicians in the relevant technical field based on the above-mentioned conception without creative work all fall within the protection scope of the present invention.

Claims

1. A rotary centering device for a petroleum and natural gas drilling pump for use at a construction site, comprising a base plate (101), characterized in that: The base plate (101) is provided with a clamping assembly, the clamping assembly comprising an annular base frame (102) and an annular slide (113), an offset slide seat (109) is slidably mounted on the annular slide seat (113), a clamping circular plate (114) is fixedly mounted on the offset slide seat (109), three clamping slide posts (116) are slidably mounted on the clamping circular plate (114), and the clamping slide posts (116) are used to clamp and fix the center rod of the crosshead; The base plate (101) is also provided with a positioning assembly and a measuring assembly. The positioning assembly comprises a positioning gear ring (104) and a positioning circular plate (107). The positioning circular plate (107) is fixedly mounted on the offset slide (109). The positioning gear ring (104) is rotatably mounted on the annular base frame (102). A positioning push plate 1 (125) and a positioning push plate 2 (126) are slidably mounted on the positioning gear ring (104). The positioning push plate 1 (125) and the positioning push plate 2 (126) are respectively slidable to adjust the position of the crosshead. The measuring assembly comprises an electronic dial gauge (138). The electronic dial gauge (138) is used to measure the offset of the crosshead.

2. The rotary centering device for oil and gas drilling pumps used at construction sites according to claim 1, characterized in that: The clamping assembly further comprises an offset slider (112) symmetrically fixedly arranged on the annular slide (113), a strip groove plate (111) being fixedly mounted on the offset slider (112), the offset slider (112) and the annular base (102) being in sliding engagement, and the strip groove plate (111) and the offset slide seat (109) being in sliding engagement.

3. The rotary centering device for oil and gas drilling pumps used at construction sites according to claim 2, characterized in that: A spline rod 1 (108) is symmetrically fixedly arranged on the annular slide (113), and the spline rod 1 (108) and the annular base (102) form a spline sliding fit. A spline rod 2 (110) is symmetrically fixedly arranged on the offset slide (109), and the spline rod 2 (110) and the annular slide (113) form a spline sliding fit.

4. The rotary centering device for oil and gas drilling pumps used at construction sites according to claim 3 is characterized in that: A clamping driving gear (119) and three clamping auxiliary gears (118) are rotatably mounted on the clamping circular plate (114). The clamping auxiliary gears (118) and the clamping driving gear (119) form a gear pair. A clamping rotating plate (117) is fixedly mounted on the clamping auxiliary gears (118). The clamping rotating plate (117) is provided with a strip-shaped through hole. The clamping rotating plate (117) and the clamping sliding column (116) are movably connected.

5. The rotary centering device for oil and gas drilling pumps used at construction sites according to claim 4, characterized in that: The positioning assembly further comprises a positioning rotating plate (103) and two driving gears. The positioning rotating plate (103) and the two driving gears are both rotatably mounted on the positioning gear ring (104). The positioning push plate 1 (125) and the positioning push plate 2 (126) are both fixedly mounted with a positioning rack (123). The positioning rack (123) and the driving gears form a gear rack pair. The two driving gears are both frictionally connected to the positioning gear ring (104).

6. The rotary centering device for oil and gas drilling pumps used at construction sites according to claim 5, characterized in that: A positioning ratchet wheel 1 (127) and a positioning ratchet wheel 2 (131) are fixedly mounted on the driving gear at the positioning push plate 2 (126); the ratchet teeth on the positioning ratchet wheel 1 (127) and the positioning ratchet wheel 2 (131) are in opposite directions; a positioning arc-shaped ratchet bar 1 (128), a positioning arc-shaped ratchet bar 2 (129), and a positioning arc-shaped rack (130) are fixedly mounted on the positioning rotating plate (103); the ratchet teeth on the positioning arc-shaped ratchet bar 1 (128) and the positioning arc-shaped ratchet bar 2 (129) are in opposite directions; when the positioning arc-shaped ratchet bar 1 (128) and the positioning ratchet wheel 1 (127) are engaged, a ratchet mechanism is formed; when the positioning arc-shaped ratchet bar 2 (129) and the positioning ratchet wheel 2 (131) are engaged, a ratchet mechanism is formed.

7. The rotary centering device for oil and gas drilling pumps used at construction sites according to claim 6, characterized in that: A positioning column gear (124) is rotatably mounted on the driving gear at the positioning push plate (125), a torsion spring is provided between the positioning column gear (124) and the driving gear at the positioning push plate (125), and the positioning column gear (124) and the positioning arc-shaped rack (130) form a gear pair when they are engaged.

8. The rotary centering device for oil and gas drilling pumps used at construction sites according to claim 7, characterized in that: The measuring assembly comprises a measuring base plate (105) fixedly mounted on a positioning circular plate (107), a measuring circular plate (106) rotatably mounted on the measuring base plate (105), and a second measuring electric cylinder (136) fixedly mounted on the side of the measuring circular plate (106).

9. The rotary centering device for oil and gas drilling pumps used at construction sites according to claim 8, characterized in that: The piston rod end of the measuring electric cylinder 2 (136) is fixedly mounted with the measuring electric cylinder 1 (135), the piston rod end of the measuring electric cylinder 1 (135) is fixedly mounted with a measuring base (139), the side of the measuring base (139) is fixedly mounted with an angle adjustment motor (137), and the electronic dial indicator (138) is fixedly mounted on the output shaft of the angle adjustment motor (137).

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