A universal drive mechanism for drilling

Abstract

This utility model relates to the field of universal joint technology and provides a universal transmission mechanism for drilling, comprising: a central connecting rod with main ends at both ends, each main end having several main connecting forks; two end connecting rods located at both ends of the central connecting rod, each end connecting rod having a secondary end, each secondary end having several secondary connecting forks, wherein the main connecting forks and secondary connecting forks are staggered when the end connecting rods cooperate with the central connecting rod; and a ball-head pin with a spherical end, a ball seat on the secondary end cooperating with the ball-head pin, an insert on the ball seat, a locking groove on the ball-head pin, and bolt holes corresponding to the locking groove on the main end. Therefore, this utility model can achieve universal transmission while ensuring good wear resistance, and also possesses good hardness and toughness, reducing the risk of device wear failure and breakage, and saving operating costs.

Description

Technical Field

[0001] This utility model relates to the field of universal joint technology, and in particular to a universal transmission mechanism for drilling. Background Technology

[0002] Screw drills are one of the most widely used downhole power tools in oil drilling. They are mainly composed of four parts: bypass valve assembly, motor assembly, universal joint assembly, and drive shaft assembly. As one of the key components of screw drills, the universal joint assembly's main function is to convert the planetary rotation of the motor into the fixed-axis rotation of the drive shaft, and to transmit the torque and speed generated by the motor to the drill bit.

[0003] In existing technologies, the most commonly used universal joint is the six-ball column type, and the connection between the connecting rod and the hinge is a six-ball groove type structure.

[0004] The above-mentioned existing technical solutions have the following drawbacks: the joint of the six-ball column universal joint requires six grooves, which results in a small force-bearing area at the joint and an inability to withstand large torques. In addition, the six-ball column universal joint is sealed by an oil seal, which requires the use of rubber sleeves for assistance. The rubber sleeves are prone to wear during use, have a short service life, and need to be replaced frequently.

[0005] In conclusion, the existing technology obviously has inconveniences and defects in practical use, so it is necessary to improve it. Utility Model Content

[0006] To address the aforementioned shortcomings, the purpose of this utility model is to provide a universal transmission mechanism for drilling, which can achieve universal transmission, ensure good wear resistance, and possess good hardness and toughness, thereby reducing the risk of device wear failure and breakage and saving operating costs.

[0007] To achieve the above objectives, this utility model provides a universal transmission mechanism for drilling, comprising: a central connecting rod, both ends of which are provided with main end heads, and the main end heads are provided with a plurality of main connecting forks; two end connecting rods, respectively located at both ends of the central connecting rod, each end connecting rod being provided with a secondary end head, and each secondary end head being provided with a plurality of secondary connecting forks, wherein when the end connecting rods cooperate with the central connecting rod, the plurality of main connecting forks and the plurality of secondary connecting forks are staggered; a ball-end pin, one end of which is spherical, the secondary end head being provided with a ball seat that cooperates with the ball-end pin, the spherical end of the ball-end pin being embedded with an insert, the ball-end pin being provided with a locking groove, and the main end head being provided with a bolt hole corresponding to the locking groove.

[0008] According to the present invention, a universal transmission mechanism for drilling is provided on the main end, a main receiving groove is provided, and a plurality of main connecting forks are evenly arranged around the main receiving groove; a secondary receiving groove is provided on the secondary end, and a plurality of secondary connecting forks are evenly arranged around the secondary receiving groove.

[0009] According to the universal transmission mechanism for drilling of this utility model, the ball seat is provided in the secondary receiving groove, the ball head pin is provided with at least two protrusions on the side wall near the spherical end, and the side wall of the secondary receiving groove is provided with a limiting seat that abuts against the protrusions.

[0010] According to the universal transmission mechanism for drilling of this utility model, the intermediate connecting rod, main end, several main connecting forks, end connecting rod, secondary end, several secondary connecting forks and ball head pin are all made of alloy steel.

[0011] According to the universal transmission mechanism for drilling of this utility model, the insert is made of tungsten cobalt cemented carbide YG8, the ball seat is made of 55SiMoVA, and the 55SiMoVA is vacuum quenched.

[0012] According to the universal transmission mechanism for drilling of this utility model, the length of each locking groove is less than the radius of the ball head pin.

[0013] The purpose of this utility model is to provide a universal transmission mechanism for drilling, which has the following advantages:

[0014] 1. By setting up mechanisms such as main end head, secondary end head, main connecting fork, secondary connecting fork and ball joint pin, the intermediate connecting rod can achieve the transmission effect when the axes of the two end connecting rods do not coincide, thus completing universal transmission.

[0015] 2. By setting up structures such as ball seats and ball head pins, the wear resistance of the device can be improved, reducing the impact of wear on the device. At the same time, the ball head pins, intermediate connecting rods and end connecting rods can be guaranteed to have good hardness and toughness, reducing the risk of device breakage and thus saving operating costs.

[0016] In summary, the beneficial effects of this utility model are as follows: it can achieve universal transmission, ensure good wear resistance, and possess good hardness and toughness, thereby reducing the risk of device wear failure and breakage and saving on usage costs. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the assembled structure of this utility model;

[0018] Figure 2 This is a structural diagram of the intermediate connecting rod;

[0019] Figure 3 This is a structural diagram of the end connecting rod;

[0020] Figure 4 This is a schematic diagram of the structure at the ball joint pin.

[0021] Figure 5 This is a front view of the ball joint pin;

[0022] In the diagram: 1-Intermediate connecting rod, 11-Main end, 12-Main connecting fork, 13-Main receiving groove, 14-Bolt hole, 2-End connecting rod, 21-Secondary end, 22-Secondary connecting fork, 23-Secondary receiving groove, 3-Ball head pin, 31-Locking groove, 32-Protrusion, 33-Insertion, 4-Ball seat. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the scope of the present utility model.

[0024] See Figures 1-5 This utility model provides a universal transmission mechanism for drilling, comprising:

[0025] The intermediate connecting rod 1 has a main end 11 fixedly connected to both ends. The main end 11 has a main receiving groove 13 in the middle of the side wall away from the intermediate connecting rod 1. At least two main connecting forks 12 are fixedly connected to the main end 11 outside the main receiving groove 13. The main connecting forks 12 are evenly arranged around the axis of the main receiving groove 13. The intermediate connecting rod 1, the main end 11 and the main connecting forks 12 are integrally formed.

[0026] Two end connecting rods 2 are respectively located at both ends of the intermediate connecting rod 1. Each end connecting rod 2 is fixedly connected to a secondary end head 21 near the intermediate connecting rod 1. A secondary receiving groove 23 is opened on the side wall of the secondary end head 21 near the intermediate connecting rod 1. At least two secondary connecting forks 22 are fixedly connected to the secondary end head 21 outside the secondary receiving groove 23. Several secondary connecting forks 22 are evenly arranged around the axis of the secondary receiving groove 23. The end connecting rod 2, the secondary end head 21 and the several secondary connecting forks 22 are integrally formed. When the main end head 11 is connected to the secondary end head 21, several main connecting forks 12 and several secondary connecting forks 22 are staggered, and there is a certain gap between adjacent main connecting forks 12 and secondary connecting forks 22. When the axes of the two end connecting rods 2 do not coincide, the intermediate connecting rod 1 can transmit power to the two end connecting rods 2.

[0027] The ball head pin 3 is used to connect the main end 11 and the secondary end 21. One end of the ball head pin 3 is a spherical end, which is inserted into the secondary receiving groove 23. At least two protrusions 32 are fixedly connected to the side wall of the ball head pin 3 near the spherical end. A limiting seat that can engage with the protrusions 32 is fixedly connected to the inner side wall of the secondary receiving groove 23. When the protrusions 32 and the limiting seats abut against each other, the ball head pin 3 is only pulled outward from the secondary receiving groove 23, and the ball head pin 3 cannot be disengaged from the secondary end 21. The end of the ball head pin 3 furthest from the spherical end is inserted into the main receiving groove 13. At least one bolt hole 14 is provided on the side wall of the main receiving groove 13, and at least one locking groove 31 is provided on the ball head pin 3. When the protrusion 32 and the limiting seat abut against each other, the bolt hole 14 and the locking groove 31 correspond to each other. Several main connecting forks 12 and several secondary connecting forks 22 are staggered. At this time, a bolt is threaded into the bolt hole 14, and the bolt can be inserted into the locking groove 31 to achieve a stable connection between the main end 11 and the secondary end 21.

[0028] Ball seat 4 is fixedly connected to the side wall of secondary receiving groove 23. Ball seat 4 has a spherical surface that mates with the spherical end of ball head pin 3. Insert 33 is embedded on the spherical end of ball head pin 3. Insert 33 and ball head pin 3 are interference fit. Ball seat 4 is made of 55SiMoVA and 55SiMoVA is vacuum quenched. Insert 33 is made of cemented carbide. Specifically, the cemented carbide material is tungsten cobalt cemented carbide YG8.

[0029] See Figures 1-5 Preferably, gaskets can be embedded in the side walls of the main connecting fork 12 and the auxiliary connecting fork 22 (i.e., the surfaces in contact with each other when the device is running). The gaskets are made of tungsten cobalt hard alloy YG8, which can further extend the life of the device.

[0030] See Figures 1-5 Preferably, users can replace the structure of insert 33 by adding a wear-resistant coating. The advantage is that it can reduce the risk of insert 33 falling off to a certain extent. The disadvantage is that the wear-resistant coating is prone to wear and failure, and its service life is slightly shorter.

[0031] See Figures 1-5 Preferably, the locking grooves 31 on the ball joint pin 3 are all non-through structures, that is, the length of the locking grooves 31 is less than the radius of the ball joint pin 3, which can improve the stability of the ball joint pin 3 to a certain extent and reduce the risk of breakage of the ball joint pin 3 at the locking grooves 31.

[0032] See Figures 1-5 Preferably, the main end 11, the main connecting fork 12, the secondary end 21, the secondary connecting fork 22, and the ball head pin 3 are all made of alloy steel (e.g., 42CrMo tempered steel).

[0033] In the implementation of this utility model, the user first inserts the spherical end of the ball head pin 3 into the secondary receiving groove 23. During the insertion process, the boss 32 does not contact the limiting seat. When the spherical end of the ball head pin 3 abuts against the spherical surface of the ball seat 4, the ball head pin 3 is rotated so that the boss 32 corresponds to the limiting seat one by one. Then, several main connecting forks 12 and several secondary connecting forks 22 are connected alternately. At this time, the end of the ball head pin 3 away from the boss 32 is located in the main receiving groove 13. The locking groove 31 on the ball head pin 3 corresponds to the bolt hole 14. A bolt is connected at the bolt hole 14, and the end of the bolt is inserted into the locking groove 31 to lock the ball head pin 3.

[0034] This utility model provides a universal transmission mechanism for drilling, which has the following advantages:

[0035] 1. By setting up mechanisms such as main end head, secondary end head, main connecting fork, secondary connecting fork and ball joint pin, the intermediate connecting rod can achieve the transmission effect when the axes of the two end connecting rods do not coincide, thus completing universal transmission.

[0036] 2. By setting up structures such as ball seats and ball head pins, the wear resistance of the device can be improved, reducing the impact of wear on the device. At the same time, the ball head pins, intermediate connecting rods and end connecting rods can be guaranteed to have good hardness and toughness, reducing the risk of device breakage and thus saving operating costs.

[0037] In summary, the beneficial effects of this utility model are as follows: it can achieve universal transmission, ensure good wear resistance, and possess good hardness and toughness, thereby reducing the risk of device wear failure and breakage and saving on usage costs.

[0038] Of course, there may be many other embodiments of this utility model. Without departing from the spirit and essence of this utility model, those skilled in the art can make corresponding changes and modifications based on this utility model, but these corresponding changes and modifications should all fall within the protection scope of the appended claims of this utility model.

Claims

1. A universal transmission mechanism for use in drilling a well, characterized in that include: The intermediate connecting rod has main ends at both ends, and several main connecting forks are provided on the main ends. Two end connecting rods are respectively located at both ends of the middle connecting rod. Each end connecting rod is provided with a secondary end head, and each secondary end head is provided with several secondary connecting forks. When the end connecting rods cooperate with the middle connecting rod, the several primary connecting forks and the several secondary connecting forks are staggered. The ball head pin has a spherical end, a ball seat that mates with the ball head pin on the secondary end, a insert on the spherical end of the ball head pin, a locking groove on the ball head pin, and a bolt hole corresponding to the locking groove on the main end.

2. The gimbaling mechanism for a well drilling rig according to claim 1, characterized in that, The main end is provided with a main receiving groove, and a plurality of main connecting forks are evenly arranged around the main receiving groove. The secondary end is provided with a secondary receiving groove, and a plurality of secondary connecting forks are evenly arranged around the secondary receiving groove.

3. The universal joint transmission mechanism for drilling according to claim 2, characterized in that, The ball seat is located in the secondary receiving groove, and at least two protrusions are provided on the side wall of the ball head pin near the spherical end. A limiting seat that abuts against the protrusions is provided on the side wall of the secondary receiving groove.

4. The universal joint transmission mechanism for drilling according to claim 1, characterized in that, The intermediate connecting rod, main end, several main connecting forks, end connecting rod, secondary end, several secondary connecting forks, and ball head pin are all made of alloy steel.

5. The universal joint transmission mechanism for drilling according to claim 1, characterized in that, The insert is made of tungsten-cobalt cemented carbide YG8, and the ball seat is made of 55SiMoVA, which has been vacuum hardened.

6. The universal joint transmission mechanism for drilling according to claim 1, characterized in that, The length of each locking groove is less than the radius of the ball joint pin.

Images