A master jaw transmission for a pipe wrench

Abstract

A kind of main tong transmission device of pipe wrench, including control system, including transmission case, the inside of which is provided with shaft coupling II, one end of the shaft coupling II is fixedly connected with speed reducer shaft, the other end is fixedly connected with power gear shaft;The outer edge of the power box is provided with speed reducer, the speed reducer one end is connected with motor by shaft coupling I, and speed reducer shaft is fixedly connected by shaft coupling II and power gear shaft;Main tong internal power gear is installed on power gear shaft and engages with idler gear, and the idler gear engages with large gear ring;Motor and control system are electrically connected.The utility model discloses by adjusting the rotating speed of motor to control the fast and slow of main tong clamping device screwing speed, has realized the stepless regulation between high speed and low speed when pipe joint thread is screwed, avoids the phenomenon that screwing torque breaks through torque upper limit and over-tightens, while the actual demand of low speed large torque and high speed small torque in the process of screwing can be realized, protects thread, improves work efficiency.

Description

Technical Field

[0001] This utility model belongs to the technical field of the machinery industry and relates to a main clamp transmission device for a pipe tightening machine. Background Technology

[0002] The tightening of oil casing couplings, drill pipes, and other threaded joints requires the use of a pipe tightening machine. The power system drives the main clamp of the coupling tightening machine to rotate, gripping the coupling and tightening it. Once the specified torque is reached, the main clamp releases, completing the tightening process. The tightening process requires the torque to increase from zero to a specified value; this process is accomplished by the power system, which continuously adjusts the torque to gradually increase it.

[0003] Traditional coupling screwing machines are powered by a hydraulic motor coupled with a gearbox. Power is supplied by the hydraulic system and the motor, and torque is controlled by adjusting the hydraulic system pressure. The control system, based on feedback from a torque sensor, gradually outputs pressure to drive the hydraulic motor and clamp the main clamp of the screwing machine. Using a hydraulic power system requires a hydraulic power station and a gearbox; the hydraulic power station has a large footprint, and the gearbox has a complex structure. Using a traditional hydraulic power system not only increases the overall cost of the equipment but also makes it prone to oil leaks and seepage.

[0004] The traditional structure uses a hydraulic motor in conjunction with a gearbox for transmission. When high and low speeds need to be switched, it is necessary to manually change different gears in the gearbox, which is time-consuming, labor-intensive, and inefficient. At the same time, the complex structure of the gearbox increases the cost of maintenance and is not conducive to the requirements of a clean working environment. Utility Model Content

[0005] This utility model provides a main clamp transmission device for a pipe tightening machine, which can significantly reduce the overall size of the machine, lower costs, and improve the maintainability and usability of the equipment.

[0006] The technical solution adopted in this utility model is as follows:

[0007] A main clamp transmission device for a pipe tightening machine includes a control system and a transmission housing. A coupling II is installed inside the transmission housing. One end of the coupling II is fixedly connected to a reducer shaft, and the other end is fixedly connected to a power gear shaft. A reducer is installed on the outer edge of the power housing. One end of the reducer is connected to a motor via a coupling I, and the reducer shaft is fixedly connected to the power gear shaft via coupling II. A power gear inside the main clamp is mounted on the power gear shaft and meshes with an idler gear, which meshes with a large gear ring. The motor and the control system are electrically connected.

[0008] The rotary encoder is mounted on the outside of the main clamp and is electrically connected to the control system.

[0009] The motor is a continuously variable speed motor.

[0010] This invention controls the tightening speed of the main clamping device by adjusting the motor speed, achieving stepless adjustment between high and low speeds during pipe joint thread tightening. This avoids over-tightening due to torque exceeding the upper limit, and simultaneously meets the practical needs of low-speed high torque and high-speed low torque during tightening, protecting the threads and improving work efficiency. Compared with traditional transmission devices, this design reduces the need for gearboxes and hydraulic power stations, significantly lowering the overall equipment cost, increasing labor productivity, and enhancing enterprise economic benefits. It also avoids accidental oil leaks and seepage, improving the operability and durability of the equipment, and simplifying maintenance. Attached Figure Description

[0011] Figure 1 is a schematic diagram of the overall structure of this utility model;

[0012] Reference numerals: 1. Motor, 2. Coupling I, 3. Reducer, 4. Transmission housing, 5. Reducer shaft, 6. Coupling II, 7. Power gear shaft, 8. Power gear, 9. Rotary encoder, 10. Idler shaft, 11. Idler, 12. Large gear ring, 13. Clamping device. Detailed Implementation

[0013] The present invention will be further described below with reference to the accompanying drawings.

[0014] Reference Figure 1 A main clamp transmission device for a pipe tightening machine includes a control system (closed-loop control system, using Siemens PLC, S7-1200 series), comprising a transmission housing 4 with a smooth outer surface, and a coupling II 6 inside. One end of coupling II 6 is fixedly connected to a reducer shaft 5, and the other end is fixedly connected to a power gear shaft 7. A reducer 3 is mounted on the outer edge of the power housing 4. One end of the reducer 3 is connected to a motor 1 via coupling I 2. The motor 1 drives the reducer 3 to rotate. The reducer shaft 5 is fixedly connected to the power gear shaft 7 via coupling II 6. A power gear 8 inside the main clamp is mounted on the power gear shaft 7 and meshes with an idler gear 11. The idler gear 11 meshes with a large gear ring 12. The motor 1 and the control system are electrically connected. The power gear 8 drives the idler gear 11 to rotate, which in turn drives the large gear ring 12 to rotate, thereby driving the clamping device 13 to clamp or open.

[0015] The rotary encoder 9 is mounted on the outside of the main clamp and is electrically connected to the control system. It records the screwing speed in real time and feeds it back to the control system to adjust the speed of motor 1.

[0016] The motor 1 is a continuously variable speed motor. By adjusting the speed of the motor 1, the screwing speed of the main clamping device 13 is controlled, thereby achieving the precise control requirements of the pipe screwing machine for low-speed high torque and high-speed low torque.

[0017] The clamping device 13 adopts a mechanism commonly used in the prior art, which generally includes parts such as a ramp plate, a jaw plate, and a toothed plate. The ramp plate is fixedly connected to the large gear ring 12, and the toothed plate is fixedly connected to the jaw plate. The jaw plate is pushed to extend and retract by the rotation of the large gear ring 12, thereby realizing the clamping or opening of the clamping device.

Claims

1. A main clamp transmission device for a pipe screwing machine, comprising a control system, characterized in that, The system includes a transmission housing (4), which is equipped with a coupling II (6). One end of the coupling II (6) is fixedly connected to a reducer shaft (5), and the other end is fixedly connected to a power gear shaft (7). A reducer (3) is installed on the outer edge of the power housing (4). One end of the reducer (3) is connected to the motor (1) through a coupling I (2). The reducer shaft (5) is fixedly connected to the power gear shaft (7) through the coupling II (6). The power gear (8) inside the main clamp is installed on the power gear shaft (7) and meshes with an idler gear (11). The idler gear (11) meshes with a large gear ring (12). The motor (1) is electrically connected to the control system.

2. The main clamp transmission device of a pipe screwing machine according to claim 1, characterized in that, The rotary encoder (9) is mounted on the outside of the main clamp and is electrically connected to the control system.

3. The main clamp transmission device of a pipe screwing machine according to claim 1, characterized in that, The motor (1) is a stepless speed regulating motor.

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