Automatic grinding device and method for drilling pump crosshead and crosshead pin

Abstract

The present invention discloses an automated grinding device for a drilling pump crosshead and a crosshead pin, including a workbench, three positioning and clamping mechanisms are arranged side by side on the workbench, a crosshead is fixed inside the positioning and clamping mechanisms, a crosshead pin is inserted inside the crosshead, the crosshead pin is connected to a motor through a floating joint, the motor is fixed on a moving mechanism, and the moving mechanism is installed on the workbench. The present invention also discloses a grinding method thereof. In the device of the present invention, the connection between the motor and the crosshead pin adopts a floating joint structure, which solves the coaxiality problem caused by position error during automated grinding of the crosshead pin and the crosshead. The crosshead pin is allowed to have a certain radial error with the crosshead during loading and rotation grinding, and no additional axial force, radial force and downward force are applied to the crosshead pin during grinding; rapid connection between the joint and the crosshead pin is achieved; and the crosshead pin can move up and down with the motor after grinding.

Description

Technical Field

[0001] The invention belongs to the technical field of oil drilling equipment, and in particular relates to an automatic grinding device for a drilling pump crosshead and a crosshead pin, and also relates to an automatic grinding method for a crosshead and a crosshead pin. Background Art

[0002] The crosshead assembly is an indispensable part of the drilling pump. It mainly converts the rotational motion of the crank connecting rod into linear reciprocating motion. It is composed of a crosshead, a crosshead pin, a bearing, a guide plate and a pull rod. Among them, the crosshead pin and the crosshead adopt a conical surface contact, periodically transmitting the changing thrust and pull force to the crosshead, and there is no relative movement between the two. During the working process, the assembly quality of the crosshead and the crosshead pin has a direct impact on the impact and noise during the operation of the drilling pump. In order to increase the contact area of ​​the conical surface between the two and ensure the matching accuracy of the conical surface, the two need to be paired and ground before assembly.

[0003] Grinding the crosshead and crosshead pin is an important process to ensure quality. The traditional grinding method is to manually push the crosshead pin to reciprocate and rotate inside the crosshead cone hole. Manual grinding is very labor-intensive, inefficient, and difficult to ensure grinding quality. Automated grinding replaces manual grinding, which can reduce labor intensity, improve grinding efficiency, and enhance grinding quality. Summary of the invention

[0004] The purpose of the present invention is to provide an automatic grinding device for a drilling pump crosshead and a crosshead pin, so as to solve the problems of high labor intensity, low efficiency and unstable grinding quality when grinding the crosshead and the crosshead pin.

[0005] Another object of the present invention is to provide an automated grinding method for the crosshead and crosshead pin of the drilling pump.

[0006] The technical solution adopted by the present invention is an automated grinding device for a drilling pump crosshead and crosshead pin, comprising a workbench, on which three positioning and clamping mechanisms are arranged side by side, a crosshead is fixed in the positioning and clamping mechanism, a crosshead pin is inserted into the crosshead, the crosshead pin is connected to a motor through a floating joint, the motor is fixed on a moving mechanism, and the moving mechanism is installed on the workbench.

[0007] The present invention is also characterized in that:

[0008] The moving mechanism includes a sliding support, a frame, upper and lower sliding guide rails, upper and lower lead screws, left and right sliding guide rails and left and right lead screws. The left and right sliding guide rails are fixed to the workbench by bolts, and the left and right lead screws are fixed to the workbench by bearing seats at both ends; the frame is slidably connected to the left and right lead screws, the upper and lower sliding guide rails are fixed to the frame by bolts, and the upper and lower lead screws are fixed to the frame by bearing seats at both ends; the sliding support is slidably connected to the upper and lower lead screws, and the motor is fixed on the sliding support.

[0009] The floating joint comprises a double-ear seat, the shaft head of the motor is inserted into the double-ear seat, the double-ear seat is connected to the transition double-ear seat through an upper pin shaft, the transition double-ear seat is connected to the connecting sleeve through a lower pin shaft, and the connecting tooling is fixed inside the connecting sleeve through a clamping component; a long hole is provided at the upper end of the connecting tooling, and the lower end of the connecting tooling is fixed to the cross pin by bolts.

[0010] The clamping assembly includes a spring clamping sleeve arranged on the outer walls of both sides of the connecting sleeve, a quick-plug pin shaft and a spring are arranged inside the spring clamping sleeve, a positioning pin is installed on the quick-plug pin shaft, the end of the positioning pin extends into the spring clamping sleeve, and the spring is clamped in the quick-plug pin shaft shoulder and the inner hole step of the spring clamping sleeve.

[0011] The positioning clamping mechanism includes two positioning plates fixed side by side on the workbench, the positioning plates and the workbench are fixed with bolts, the side surfaces of the positioning plates are in contact with the arc surface of the crosshead, bases are fixed to the outer sides of the two positioning plates, oil cylinders are installed on the bases, the piston rods of the oil cylinders are connected to the pressure plates through pins, and supports are also installed on the bases, and the end of the support is connected to the pressure plate through a pin.

[0012] Another technical solution adopted by the present invention is an automated grinding method for a drilling pump crosshead and a crosshead pin, and the specific implementation steps are as follows:

[0013] Step 1: Place the assembly consisting of the cross pin and the cross head on the workbench, position and clamp it with a positioning and clamping mechanism, and fix the connecting tooling on the cross pin with bolts;

[0014] Step 2: The moving mechanism drives the motor and the floating joint to move downward, the connecting tool is inserted into the inner hole of the connecting sleeve, the two quick-plug pin shafts are rotated to align the positioning pins with the holes on the spring compression sleeve, and the floating joint is operated to rotate. When the quick-plug pin shaft is aligned with the long hole on the connecting tool, the spring presses the quick-plug pin shaft into the long hole on the connecting tool to achieve connection;

[0015] Step 3: The moving mechanism drives the crosshead pin to lift up and apply the grinding paste on the grinding cone surface, and then lower it to grind reciprocally according to the preset speed and rotation angle;

[0016] Step 4: The moving mechanism drives the crosshead pin to lift up and clean the grinding paste on the conical surface, then lower it, pull out the quick-plug pin shafts on both sides and rotate them to disengage the quick-plug pin shafts from the connecting tooling, and operate the moving structure to move up;

[0017] Step 5: The moving mechanism moves to the next station and repeats the above operation.

[0018] The beneficial effects of the present invention are:

[0019] (1) In a way that simulates manual reciprocating grinding to the greatest extent possible, the weight of the crosshead pin provides downward pressure on the crosshead cone surface to avoid excessive friction on the cone surface and burning.

[0020] (2) The connection between the motor and the crosshead pin adopts a floating joint structure, which solves the coaxiality problem caused by the position error during the automatic grinding of the crosshead pin and the crosshead. The crosshead pin is allowed to have a certain radial error with the crosshead during installation and rotation grinding, and no additional axial force, radial force and downward pressure are applied to the crosshead pin during grinding; the joint and the crosshead pin are quickly connected; after grinding, the crosshead pin can move up and down with the motor.

[0021] (3) High degree of automation, which can quickly realize the automatic positioning and fixing of the crosshead, and the quick connection between the motor and the crosshead pin, with high production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of an automatic grinding device for a drilling pump crosshead and a crosshead pin of the present invention;

[0023] Figure 2 It is a structural schematic diagram of a floating joint in an automatic grinding device for a drilling pump crosshead and a crosshead pin of the present invention;

[0024] Figure 3 It is a structural schematic diagram of a positioning and clamping mechanism in an automated grinding device for a drilling pump crosshead and a crosshead pin of the present invention;

[0025] Figure 4 It is a structural schematic diagram of a moving mechanism in an automatic grinding device for a drilling pump crosshead and a crosshead pin of the present invention (I);

[0026] Figure 5 This is a structural schematic diagram (II) of a moving mechanism in an automatic grinding device for a drilling pump crosshead and a crosshead pin of the present invention.

[0027] In the figure, 1. crosshead pin, 2. crosshead, 3. floating joint, 4. positioning clamping mechanism, 5. moving mechanism, 6. motor, 7. workbench, 3-1. double-ear seat, 3-2. upper pin shaft, 3-3. transition double-ear seat, 3-4. lower pin shaft, 3-5. connecting sleeve, 3-6. quick-plug pin shaft, 3-7. connecting tooling, 3-8. spring, 3-9. spring clamping sleeve, 3-10. positioning pin, 4-1. positioning plate, 4-2. cylinder, 4-3. pressure plate, 4-4. support, 4-5. base, 5-1. sliding support, 5-2. frame, 5-3. upper and lower sliding guide rails, 5-4. upper and lower screws, 5-5. left and right sliding guide rails, 5-6. left and right screws. DETAILED DESCRIPTION

[0028] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] The present invention provides an automatic grinding device for a drilling pump crosshead and a crosshead pin, such as Figure 1 As shown, it includes a workbench 7, on which three positioning and clamping mechanisms 4 are arranged side by side, a crosshead 2 is fixed inside the positioning and clamping mechanism 4, a crosshead pin 1 is inserted inside the crosshead 2, the crosshead pin 1 is connected to a motor 6 through a floating joint 3, the motor 6 is fixed on a moving mechanism 5, and the moving mechanism 5 is installed on the guide rails in the left and right directions of the workbench 7;

[0030] Mobile mechanism 5, such as Figure 4 and Figure 5 As shown, it includes a sliding support 5-1, a frame 5-2, upper and lower sliding guide rails 5-3, upper and lower lead screws 5-4, left and right sliding guide rails 5-5 and left and right lead screws 5-6. Among them, the left and right sliding guide rails 5-5 are fixed on the workbench 7 with bolts, and the left and right lead screws 5-6 are fixed on the workbench 7 through bearing seats at both ends; there is a slider on the bottom of the frame 5-2 that rotates and slides along the left and right lead screws 5-6. Through the rotation of the left and right lead screws 5-6, the frame 5-2 slides left and right along the sliding guide rails 5-5 to change the grinding position. The frame 5-2 is provided with a sliding support 5-1, upper and lower sliding guide rails 5-3, and upper and lower lead screws 5-4, wherein the upper and lower sliding guide rails 5-3 are fixed to the frame 5-2 with bolts, and the upper and lower lead screws 5-4 are fixed to the frame 5-2 through bearing seats at both ends; the sliding support 5-1 is installed on the upper and lower sliding guide rails 5-3, and the motor 6 is fixed on the sliding support 5-1. The sliding support 5-1 has a slider that rotates and slides along the upper and lower lead screws 5-4. Through the rotation of the upper and lower lead screws 5-4, the sliding support 5-1 slides up and down along the sliding guide rails 5-3 to lift and lower the cross pin.

[0031] Floating joint 3, such as Figure 2As shown, it includes a double-ear seat 3-1, the upper part of which is placed on a sliding support 5-1 through a plane bearing, and is used to bear the weight of the crosshead pin 1 and the floating joint 3 assembly suspended below it. The shaft head of the motor 6 is inserted into the hole on the upper part of the double-ear seat 3-1, and the shaft holes are interference fit, and a key connection is used to transmit the grinding torque. The double-ear seat 3-1 is connected to the transition double-ear seat 3-3 through the upper pin shaft 3-2, and the shaft holes are clearance fit to ensure that the transition double-ear seat 3-3 can rotate freely along the radial direction of the upper pin shaft 3-2. The transition double-ear seat 3-3 is connected to the connecting sleeve 3-5 through the lower pin shaft 3-4, and the shaft holes are clearance fit to ensure that the connecting sleeve 3-5 can rotate freely along the radial direction of the lower pin shaft 3-4. The connection tool 3-7 is fixed inside the connection sleeve 3-5 by a clamping assembly; the inner hole of the connection sleeve 3-5 does not contact the shaft hole of the connection tool 3-7, allowing the cross pin to have a certain radial error with the cross head during installation and rotation grinding, solving the problem of high coaxiality requirements when grinding the cross pin 1 and the cross head 2; the upper end of the connection tool 3-7 is provided with a long hole, which is connected to the quick-plug pin shaft 3-6 during operation; the lower end of the connection tool 3-7 is fixed to the cross pin 1 by bolts;

[0032] The clamping assembly includes spring clamping sleeves 3-9 arranged on the outer walls of both sides of the connecting sleeve 3-5, and the two are fixedly connected by bolts through the flange at the bottom of the spring clamping sleeve 3-9. The spring clamping sleeve 3-9 is provided with a quick-release pin shaft 3-6 and a spring 3-8. The quick-release pin shaft 3-6 is provided with a positioning pin 3-10, and the end of the positioning pin 3-10 extends into the spring clamping sleeve 3-9. Both ends of the quick-release pin shaft 3-6 extend out of the spring clamping sleeve 3-9, and one end extends into the connecting sleeve 3-5; the spring 3-8 is clamped between the quick-release pin shaft 3-6 shoulder and the inner hole step of the spring clamping sleeve 3-9. Figure 2 The middle spring 8 is in a pre-tightened state. The shaft hole between the quick-plug pin shaft 3-6 and the connecting sleeve 3-5 adopts a clearance fit to facilitate the insertion and removal of the quick-plug pin shaft 3-6. The positioning pin 3-10 and the small hole on the outer wall of the spring compression sleeve 3-9 adopt a clearance fit to facilitate insertion and removal. After the quick-plug pin shaft 3-6 is inserted into the inner hole of the connecting tool 3-7 (such as Figure 2 As shown in the figure, the radial direction of the quick-plug pin shaft 3-6 has a gap with the connecting tool 3-7, ensuring that no additional radial force and downward pressure are applied to the cross pin 1 during rotational grinding; when the sliding support 5-1 is lifted up, the quick-plug pin shaft 3-6 contacts the upper part of the long hole of the connecting tool 3-7, so that the cross pin 1 can move up and down with the sliding support 5-1, which is used to apply and clean the grinding paste and check the grinding effect. After the grinding is completed, the quick-plug pin shaft 3-6 is pulled out and rotated, and the end of the positioning pin 3-10 presses against the end of the spring compression sleeve 3-9 to achieve the quick separation of the quick-plug pin shaft 3-6 and the connecting tool 3-7.

[0033] Positioning clamping mechanism 4, such as Figure 3As shown, it includes two positioning plates 4-1 fixed side by side on the workbench 7. The positioning plates 4-1 are fixed to the workbench 7 with bolts. The side of the positioning plates 4-1 contacts the arc surface of the crosshead 2 to locate the left and right positions of the crosshead 2. The outer sides of the two positioning plates 4-1 are fixed with bases 4-5. The bases 4-5 are vertically arranged and fixed to the workbench 7 with bolts at the bottom. The bases 4-5 are installed with cylinders 4-2. The piston rod of the cylinder 4-2 is connected to the pressure plate 4-3 through a pin shaft. The base 4-5 is also installed with a support 4-4. The end of the support 4-4 is connected to the pressure plate 4-3 through a pin shaft. The pressure plate 4-3 can press the crosshead 2 when the cylinder 4-2 is pushed out. When working, the cylinder 4-2 pushes the rear end of the pressure plate 4-3 upwards, and the front end of the pressure plate 4-3 contacts the upper surface of the crosshead 2 to press the crosshead 2. The support 4-4 is used to support the pressure plate 4-3. Figure 3 As shown on the right; when released, the oil cylinder 4-2 pulls the rear end of the pressing plate 4-3 downward, and the front end of the pressing plate 4-3 is lifted and separated from the crosshead 2, as shown in FIG. Figure 3 Shown on the left.

[0034] The present invention provides an automated grinding method for a drilling pump crosshead and a crosshead pin, and the specific implementation steps are as follows:

[0035] Step 1: Place the assembly consisting of the cross pin 1 and the cross head 2 on the workbench 7, position and clamp them with the positioning and clamping mechanism 4, and fix the connecting tool 3-7 to the cross pin 1 with bolts.

[0036] Step 2, the moving mechanism 5 drives the motor 6 and the floating joint 3 to move downward, the connecting tooling 3-7 is inserted into the inner hole of the connecting sleeve 3-5, the two quick-plug pin shafts 3-6 are rotated, and their positioning pins 3-10 are aligned with the small holes on the spring compression sleeve 3-9, and the floating joint 3 is operated to rotate. When the quick-plug pin shaft 3-6 is aligned with the long hole on the connecting tooling 3-7, the spring 3-8 presses the quick-plug pin shaft 3-6 into the long hole on the connecting tooling 3-7 to achieve connection.

[0037] Step 3, the moving mechanism 5 drives the cross pin 1 to be lifted up to apply the grinding paste on the grinding cone surface, and then lowered, and grinds reciprocatingly according to the preset speed and rotation angle.

[0038] Step 4, the moving mechanism 5 drives the cross pin 1 to lift up and clean the grinding paste on the conical surface, then lower it, pull out the quick-plug pin shafts 3-6 on both sides and rotate them, so that the thin pin shafts are disengaged from the small holes and press against the outer end surface of the spring compression sleeve 3-9, so as to quickly disengage the plug shaft 3-6 from the connecting tooling 3-7, and operate the moving structure 5 to move up.

[0039] Step 5: Move the moving mechanism 5 to the next station and repeat steps 1 to 4.

[0040] The motor is used as the power to drive the crosshead pin to reciprocate in the inner hole of the crosshead to achieve the purpose of grinding. The motor can rotate forward and reverse at a preset angle at a low speed to achieve the reciprocating rotation requirements of grinding.

[0041] The automated grinding device of the present invention adopts a motor-driven moving mechanism to drive the crosshead pin to move up and down, so as to realize the loading and unloading of the crosshead pin, and facilitate the coating and cleaning of the grinding paste. The moving mechanism can also move left and right to grind the three crosshead assemblies in sequence. The connection between the motor and the crosshead pin adopts the structure of a floating joint, which adopts the design principle of a universal joint and is designed with a quick connecting pin. The crosshead pin and the moving device can be quickly disassembled and assembled, and the crosshead pin can be lifted and lowered together with the moving device; the torque required for reciprocating rotation can be transmitted to the crosshead pin; a certain radial error between the crosshead pin and the crosshead can be allowed during loading and rotational grinding; and the crosshead pin can be ensured not to apply additional downward pressure to the grinding surface during rotational grinding.

Claims

1. An automatic grinding device for a drilling pump crosshead and a crosshead pin, characterized in that: The invention comprises a workbench (7), wherein three positioning and clamping mechanisms (4) are arranged side by side on the workbench (7), a crosshead (2) is fixed inside the positioning and clamping mechanism (4), a crosshead pin (1) is inserted inside the crosshead (2), the crosshead pin (1) is connected to a motor (6) via a floating joint (3), the motor (6) is fixed on a moving mechanism (5), and the moving mechanism (5) is mounted on the workbench (7); The moving mechanism (5) comprises a sliding support (5-1), a frame (5-2), upper and lower sliding guide rails (5-3), upper and lower lead screws (5-4), left and right sliding guide rails (5-5) and left and right lead screws (5-6); the left and right sliding guide rails (5-5) are fixed to the workbench (7) by bolts, and the left and right lead screws (5-6) are fixed to the workbench (7) by bearing seats at both ends; the frame (5-2) is slidably connected to the left and right lead screws (5-6); the upper and lower sliding guide rails (5-3) are fixed to the frame (5-2) by bolts, and the upper and lower lead screws (5-4) are fixed to the frame (5-2) by bearing seats at both ends; the sliding support (5-1) is slidably connected to the upper and lower lead screws (5-4), and the motor (6) is fixed to the sliding support (5-1); The floating joint (3) comprises a double-ear seat (3-1), the shaft head of the motor (6) is inserted into the double-ear seat (3-1), the double-ear seat (3-1) is connected to the transition double-ear seat (3-3) via an upper pin shaft (3-2), the transition double-ear seat (3-3) is connected to the connecting sleeve (3-5) via a lower pin shaft (3-4), and the connecting tool (3-7) is fixed inside the connecting sleeve (3-5) via a clamping assembly; the upper end of the connecting tool (3-7) is provided with a long hole, and the lower end of the connecting tool (3-7) is fixed to the cross pin (1) via bolts; The clamping assembly comprises a spring clamping sleeve (3-9) arranged on the outer walls of both sides of the connecting sleeve (3-5); a quick-release pin shaft (3-6) and a spring (3-8) are arranged inside the spring clamping sleeve (3-9); a positioning pin (3-10) is installed on the quick-release pin shaft (3-6); the end of the positioning pin (3-10) extends into the spring clamping sleeve (3-9); and the spring (3-8) is clamped between the shaft shoulder of the quick-release pin shaft (3-6) and the inner hole step of the spring clamping sleeve (3-9); The positioning clamping mechanism (4) comprises two positioning plates (4-1) fixed side by side on a workbench (7), the positioning plates (4-1) and the workbench (7) being fixed by bolts, the side surfaces of the positioning plates (4-1) being in contact with the arc surface of the crosshead (2), the outer side surfaces of the two positioning plates (4-1) being fixed with bases (4-5), the bases (4-5) being mounted with oil cylinders (4-2), the piston rods of the oil cylinders (4-2) being connected to the pressure plates (4-3) via pins, the bases (4-5) being further mounted with supports (4-4), the ends of the supports (4-4) being connected to the pressure plates (4-3) via pins.

2. An automated grinding method for a drilling pump crosshead and a crosshead pin, implemented by using the automated grinding device for a drilling pump crosshead and a crosshead pin as claimed in claim 1, characterized in that: The specific implementation steps are as follows: Step 1: Place the assembly consisting of the cross pin (1) and the cross head (2) on a workbench (7), position and clamp them using a positioning and clamping mechanism (4), and fix the connecting fixture (3-7) to the cross pin (1) using bolts; Step 2, the moving mechanism (5) drives the motor (6) and the floating joint (3) to move downward, the connecting tool (3-7) is inserted into the inner hole of the connecting sleeve (3-5), the two quick-release pin shafts (3-6) are rotated, and the positioning pins (3-10) thereof are aligned with the holes on the spring compression sleeve (3-9), and the floating joint (3) is manipulated to rotate. When the quick-release pin shaft (3-6) is aligned with the long hole on the connecting tool (3-7), the spring (3-8) presses the quick-release pin shaft (3-6) into the long hole on the connecting tool (3-7) to achieve connection; Step 3, the moving mechanism (5) drives the crosshead pin (1) to be lifted up to apply the grinding paste on the grinding cone surface, and then lowered, and grinds reciprocatingly according to the preset speed and rotation angle; Step 4, the moving mechanism (5) drives the crosshead pin (1) to be lifted up to clean the grinding paste on the conical surface, and then lowered, the quick plug pin shafts (3-6) on both sides are pulled out and rotated to achieve the disengagement of the quick plug pin shafts (3-6) from the connecting tooling (3-7), and the moving structure (5) is manipulated to move upward; Step 5: Move the moving mechanism (5) to the next station and repeat the above operation.

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